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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 | |
2892acdb NC |
77 | type. For C<our> lexicals, the type is also SVt_PVGV, with the MAGIC slot |
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 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 | ||
1dba731d NC |
116 | #ifdef PERL_MAD |
117 | void pad_peg(const char* s) { | |
118 | static int pegcnt; | |
119 | pegcnt++; | |
120 | } | |
121 | #endif | |
dd2155a4 DM |
122 | |
123 | /* | |
124 | =for apidoc pad_new | |
125 | ||
126 | Create a new compiling padlist, saving and updating the various global | |
127 | vars at the same time as creating the pad itself. The following flags | |
128 | can be OR'ed together: | |
129 | ||
130 | padnew_CLONE this pad is for a cloned CV | |
131 | padnew_SAVE save old globals | |
132 | padnew_SAVESUB also save extra stuff for start of sub | |
133 | ||
134 | =cut | |
135 | */ | |
136 | ||
137 | PADLIST * | |
c7c737cb | 138 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 | 139 | { |
97aff369 | 140 | dVAR; |
e1ec3a88 | 141 | AV *padlist, *padname, *pad; |
dd2155a4 | 142 | |
f3548bdc DM |
143 | ASSERT_CURPAD_LEGAL("pad_new"); |
144 | ||
dd2155a4 DM |
145 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
146 | * vars (based on flags) rather than storing vals + addresses for | |
147 | * each individually. Also see pad_block_start. | |
148 | * XXX DAPM Try to see whether all these conditionals are required | |
149 | */ | |
150 | ||
151 | /* save existing state, ... */ | |
152 | ||
153 | if (flags & padnew_SAVE) { | |
3979c56f | 154 | SAVECOMPPAD(); |
dd2155a4 DM |
155 | SAVESPTR(PL_comppad_name); |
156 | if (! (flags & padnew_CLONE)) { | |
157 | SAVEI32(PL_padix); | |
158 | SAVEI32(PL_comppad_name_fill); | |
159 | SAVEI32(PL_min_intro_pending); | |
160 | SAVEI32(PL_max_intro_pending); | |
b5c19bd7 | 161 | SAVEI32(PL_cv_has_eval); |
dd2155a4 DM |
162 | if (flags & padnew_SAVESUB) { |
163 | SAVEI32(PL_pad_reset_pending); | |
164 | } | |
165 | } | |
166 | } | |
167 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
168 | * saved - check at some pt that this is okay */ | |
169 | ||
170 | /* ... create new pad ... */ | |
171 | ||
172 | padlist = newAV(); | |
173 | padname = newAV(); | |
174 | pad = newAV(); | |
175 | ||
176 | if (flags & padnew_CLONE) { | |
177 | /* XXX DAPM I dont know why cv_clone needs it | |
178 | * doing differently yet - perhaps this separate branch can be | |
179 | * dispensed with eventually ??? | |
180 | */ | |
181 | ||
e1ec3a88 | 182 | AV * const a0 = newAV(); /* will be @_ */ |
dd2155a4 DM |
183 | av_extend(a0, 0); |
184 | av_store(pad, 0, (SV*)a0); | |
11ca45c0 | 185 | AvREIFY_only(a0); |
dd2155a4 DM |
186 | } |
187 | else { | |
a0714e2c | 188 | av_store(pad, 0, NULL); |
dd2155a4 DM |
189 | } |
190 | ||
191 | AvREAL_off(padlist); | |
192 | av_store(padlist, 0, (SV*)padname); | |
193 | av_store(padlist, 1, (SV*)pad); | |
194 | ||
195 | /* ... then update state variables */ | |
196 | ||
197 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); | |
198 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); | |
199 | PL_curpad = AvARRAY(PL_comppad); | |
200 | ||
201 | if (! (flags & padnew_CLONE)) { | |
202 | PL_comppad_name_fill = 0; | |
203 | PL_min_intro_pending = 0; | |
204 | PL_padix = 0; | |
b5c19bd7 | 205 | PL_cv_has_eval = 0; |
dd2155a4 DM |
206 | } |
207 | ||
208 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 209 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
dd2155a4 | 210 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
b5c19bd7 | 211 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
dd2155a4 DM |
212 | PTR2UV(padname), (UV)flags |
213 | ) | |
214 | ); | |
215 | ||
216 | return (PADLIST*)padlist; | |
217 | } | |
218 | ||
219 | /* | |
220 | =for apidoc pad_undef | |
221 | ||
222 | Free the padlist associated with a CV. | |
223 | If parts of it happen to be current, we null the relevant | |
224 | PL_*pad* global vars so that we don't have any dangling references left. | |
225 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
a3985cdc | 226 | inner subs to the outer of this cv. |
dd2155a4 | 227 | |
7dafbf52 DM |
228 | (This function should really be called pad_free, but the name was already |
229 | taken) | |
230 | ||
dd2155a4 DM |
231 | =cut |
232 | */ | |
233 | ||
234 | void | |
a3985cdc | 235 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 | 236 | { |
97aff369 | 237 | dVAR; |
dd2155a4 | 238 | I32 ix; |
b64e5050 | 239 | const PADLIST * const padlist = CvPADLIST(cv); |
dd2155a4 | 240 | |
1dba731d | 241 | pad_peg("pad_undef"); |
dd2155a4 DM |
242 | if (!padlist) |
243 | return; | |
0565a181 | 244 | if (SvIS_FREED(padlist)) /* may be during global destruction */ |
dd2155a4 DM |
245 | return; |
246 | ||
247 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 DM |
248 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", |
249 | PTR2UV(cv), PTR2UV(padlist)) | |
dd2155a4 DM |
250 | ); |
251 | ||
7dafbf52 DM |
252 | /* detach any '&' anon children in the pad; if afterwards they |
253 | * are still live, fix up their CvOUTSIDEs to point to our outside, | |
254 | * bypassing us. */ | |
255 | /* XXX DAPM for efficiency, we should only do this if we know we have | |
256 | * children, or integrate this loop with general cleanup */ | |
dd2155a4 | 257 | |
7dafbf52 | 258 | if (!PL_dirty) { /* don't bother during global destruction */ |
53c1dcc0 | 259 | CV * const outercv = CvOUTSIDE(cv); |
e1ec3a88 | 260 | const U32 seq = CvOUTSIDE_SEQ(cv); |
53c1dcc0 AL |
261 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
262 | SV ** const namepad = AvARRAY(comppad_name); | |
263 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; | |
264 | SV ** const curpad = AvARRAY(comppad); | |
dd2155a4 | 265 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
504618e9 | 266 | SV * const namesv = namepad[ix]; |
dd2155a4 | 267 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 268 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 269 | { |
7fc63493 | 270 | CV * const innercv = (CV*)curpad[ix]; |
10dc53a8 DM |
271 | U32 inner_rc = SvREFCNT(innercv); |
272 | assert(inner_rc); | |
a0714e2c | 273 | namepad[ix] = NULL; |
7dafbf52 | 274 | SvREFCNT_dec(namesv); |
01773faa DM |
275 | |
276 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ | |
a0714e2c | 277 | curpad[ix] = NULL; |
01773faa | 278 | SvREFCNT_dec(innercv); |
10dc53a8 | 279 | inner_rc--; |
01773faa | 280 | } |
b37c2d43 AL |
281 | |
282 | /* in use, not just a prototype */ | |
283 | if (inner_rc && (CvOUTSIDE(innercv) == cv)) { | |
7dafbf52 | 284 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 JH |
285 | /* don't relink to grandfather if he's being freed */ |
286 | if (outercv && SvREFCNT(outercv)) { | |
287 | CvWEAKOUTSIDE_off(innercv); | |
288 | CvOUTSIDE(innercv) = outercv; | |
289 | CvOUTSIDE_SEQ(innercv) = seq; | |
f84c484e | 290 | SvREFCNT_inc_simple_void_NN(outercv); |
9d1ce744 JH |
291 | } |
292 | else { | |
601f1833 | 293 | CvOUTSIDE(innercv) = NULL; |
9d1ce744 | 294 | } |
dd2155a4 DM |
295 | } |
296 | } | |
297 | } | |
298 | } | |
7dafbf52 | 299 | |
dd2155a4 DM |
300 | ix = AvFILLp(padlist); |
301 | while (ix >= 0) { | |
b37c2d43 AL |
302 | const SV* const sv = AvARRAY(padlist)[ix--]; |
303 | if (sv) { | |
304 | if (sv == (SV*)PL_comppad_name) | |
305 | PL_comppad_name = NULL; | |
306 | else if (sv == (SV*)PL_comppad) { | |
307 | PL_comppad = NULL; | |
308 | PL_curpad = NULL; | |
309 | } | |
dd2155a4 DM |
310 | } |
311 | SvREFCNT_dec(sv); | |
312 | } | |
313 | SvREFCNT_dec((SV*)CvPADLIST(cv)); | |
4608196e | 314 | CvPADLIST(cv) = NULL; |
dd2155a4 DM |
315 | } |
316 | ||
317 | ||
318 | ||
319 | ||
320 | /* | |
321 | =for apidoc pad_add_name | |
322 | ||
b5c19bd7 DM |
323 | Create a new name and associated PADMY SV in the current pad; return the |
324 | offset. | |
dd2155a4 DM |
325 | If C<typestash> is valid, the name is for a typed lexical; set the |
326 | name's stash to that value. | |
327 | If C<ourstash> is valid, it's an our lexical, set the name's | |
035dab74 | 328 | OURSTASH to that value |
dd2155a4 | 329 | |
dd2155a4 DM |
330 | If fake, it means we're cloning an existing entry |
331 | ||
332 | =cut | |
333 | */ | |
334 | ||
dd2155a4 | 335 | PADOFFSET |
e1ec3a88 | 336 | Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake) |
dd2155a4 | 337 | { |
97aff369 | 338 | dVAR; |
504618e9 | 339 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
561b68a9 | 340 | SV* const namesv = newSV(0); |
dd2155a4 | 341 | |
f3548bdc DM |
342 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
343 | ||
dd2155a4 | 344 | |
2892acdb | 345 | sv_upgrade(namesv, (ourstash || typestash) ? SVt_PVMG : SVt_PVNV); |
dd2155a4 DM |
346 | sv_setpv(namesv, name); |
347 | ||
348 | if (typestash) { | |
00b1698f | 349 | SvPAD_TYPED_on(namesv); |
b37c2d43 | 350 | SvSTASH_set(namesv, (HV*)SvREFCNT_inc_simple_NN((SV*)typestash)); |
dd2155a4 DM |
351 | } |
352 | if (ourstash) { | |
00b1698f | 353 | SvPAD_OUR_on(namesv); |
035dab74 | 354 | OURSTASH_set(namesv, ourstash); |
f84c484e | 355 | SvREFCNT_inc_simple_void_NN(ourstash); |
dd2155a4 DM |
356 | } |
357 | ||
358 | av_store(PL_comppad_name, offset, namesv); | |
b5c19bd7 | 359 | if (fake) { |
dd2155a4 | 360 | SvFAKE_on(namesv); |
b5c19bd7 DM |
361 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
362 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); | |
363 | } | |
dd2155a4 | 364 | else { |
ee6cee0c | 365 | /* not yet introduced */ |
9d6ce603 | 366 | SvNV_set(namesv, (NV)PAD_MAX); /* min */ |
b19bbeda | 367 | SvIV_set(namesv, 0); /* max */ |
ee6cee0c | 368 | |
dd2155a4 DM |
369 | if (!PL_min_intro_pending) |
370 | PL_min_intro_pending = offset; | |
371 | PL_max_intro_pending = offset; | |
b5c19bd7 | 372 | /* if it's not a simple scalar, replace with an AV or HV */ |
f3548bdc DM |
373 | /* XXX DAPM since slot has been allocated, replace |
374 | * av_store with PL_curpad[offset] ? */ | |
dd2155a4 DM |
375 | if (*name == '@') |
376 | av_store(PL_comppad, offset, (SV*)newAV()); | |
377 | else if (*name == '%') | |
378 | av_store(PL_comppad, offset, (SV*)newHV()); | |
379 | SvPADMY_on(PL_curpad[offset]); | |
b5c19bd7 DM |
380 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
381 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", | |
382 | (long)offset, name, PTR2UV(PL_curpad[offset]))); | |
dd2155a4 DM |
383 | } |
384 | ||
385 | return offset; | |
386 | } | |
387 | ||
388 | ||
389 | ||
390 | ||
391 | /* | |
392 | =for apidoc pad_alloc | |
393 | ||
394 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
395 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
cf525c36 | 396 | for a slot which has no name and no active value. |
dd2155a4 DM |
397 | |
398 | =cut | |
399 | */ | |
400 | ||
401 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
402 | * or at least rationalise ??? */ | |
6d640399 NC |
403 | /* And flag whether the incoming name is UTF8 or 8 bit? |
404 | Could do this either with the +ve/-ve hack of the HV code, or expanding | |
405 | the flag bits. Either way, this makes proper Unicode safe pad support. | |
406 | Also could change the sv structure to make the NV a union with 2 U32s, | |
407 | so that SvCUR() could stop being overloaded in pad SVs. | |
408 | NWC | |
409 | */ | |
dd2155a4 DM |
410 | |
411 | PADOFFSET | |
412 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
413 | { | |
97aff369 | 414 | dVAR; |
dd2155a4 DM |
415 | SV *sv; |
416 | I32 retval; | |
417 | ||
6136c704 | 418 | PERL_UNUSED_ARG(optype); |
f3548bdc DM |
419 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
420 | ||
dd2155a4 DM |
421 | if (AvARRAY(PL_comppad) != PL_curpad) |
422 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
423 | if (PL_pad_reset_pending) | |
424 | pad_reset(); | |
425 | if (tmptype & SVs_PADMY) { | |
235cc2e3 | 426 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 DM |
427 | retval = AvFILLp(PL_comppad); |
428 | } | |
429 | else { | |
551405c4 | 430 | SV * const * const names = AvARRAY(PL_comppad_name); |
e1ec3a88 | 431 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
dd2155a4 DM |
432 | for (;;) { |
433 | /* | |
434 | * "foreach" index vars temporarily become aliases to non-"my" | |
435 | * values. Thus we must skip, not just pad values that are | |
436 | * marked as current pad values, but also those with names. | |
437 | */ | |
438 | /* HVDS why copy to sv here? we don't seem to use it */ | |
439 | if (++PL_padix <= names_fill && | |
440 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
441 | continue; | |
442 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
443 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
444 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
445 | break; | |
446 | } | |
447 | retval = PL_padix; | |
448 | } | |
449 | SvFLAGS(sv) |= tmptype; | |
450 | PL_curpad = AvARRAY(PL_comppad); | |
451 | ||
452 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
453 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
454 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
455 | PL_op_name[optype])); | |
fd0854ff DM |
456 | #ifdef DEBUG_LEAKING_SCALARS |
457 | sv->sv_debug_optype = optype; | |
458 | sv->sv_debug_inpad = 1; | |
fd0854ff | 459 | #endif |
a212c8b5 | 460 | return (PADOFFSET)retval; |
dd2155a4 DM |
461 | } |
462 | ||
463 | /* | |
464 | =for apidoc pad_add_anon | |
465 | ||
466 | Add an anon code entry to the current compiling pad | |
467 | ||
468 | =cut | |
469 | */ | |
470 | ||
471 | PADOFFSET | |
472 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
473 | { | |
97aff369 | 474 | dVAR; |
dd2155a4 | 475 | PADOFFSET ix; |
561b68a9 | 476 | SV* const name = newSV(0); |
1dba731d | 477 | pad_peg("add_anon"); |
dd2155a4 DM |
478 | sv_upgrade(name, SVt_PVNV); |
479 | sv_setpvn(name, "&", 1); | |
b19bbeda | 480 | SvIV_set(name, -1); |
9d6ce603 | 481 | SvNV_set(name, 1); |
dd2155a4 DM |
482 | ix = pad_alloc(op_type, SVs_PADMY); |
483 | av_store(PL_comppad_name, ix, name); | |
f3548bdc | 484 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 DM |
485 | av_store(PL_comppad, ix, sv); |
486 | SvPADMY_on(sv); | |
7dafbf52 DM |
487 | |
488 | /* to avoid ref loops, we never have parent + child referencing each | |
489 | * other simultaneously */ | |
490 | if (CvOUTSIDE((CV*)sv)) { | |
491 | assert(!CvWEAKOUTSIDE((CV*)sv)); | |
492 | CvWEAKOUTSIDE_on((CV*)sv); | |
493 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); | |
494 | } | |
dd2155a4 DM |
495 | return ix; |
496 | } | |
497 | ||
498 | ||
499 | ||
500 | /* | |
501 | =for apidoc pad_check_dup | |
502 | ||
503 | Check for duplicate declarations: report any of: | |
504 | * a my in the current scope with the same name; | |
505 | * an our (anywhere in the pad) with the same name and the same stash | |
506 | as C<ourstash> | |
507 | C<is_our> indicates that the name to check is an 'our' declaration | |
508 | ||
509 | =cut | |
510 | */ | |
511 | ||
512 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
513 | ||
514 | void | |
e1ec3a88 | 515 | Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash) |
dd2155a4 | 516 | { |
97aff369 | 517 | dVAR; |
53c1dcc0 | 518 | SV **svp; |
dd2155a4 DM |
519 | PADOFFSET top, off; |
520 | ||
f3548bdc | 521 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
041457d9 | 522 | if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) |
dd2155a4 DM |
523 | return; /* nothing to check */ |
524 | ||
525 | svp = AvARRAY(PL_comppad_name); | |
526 | top = AvFILLp(PL_comppad_name); | |
527 | /* check the current scope */ | |
528 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
529 | * type ? */ | |
530 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
53c1dcc0 AL |
531 | SV * const sv = svp[off]; |
532 | if (sv | |
dd2155a4 | 533 | && sv != &PL_sv_undef |
ee6cee0c | 534 | && !SvFAKE(sv) |
dd2155a4 | 535 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
b15aece3 | 536 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 | 537 | { |
00b1698f | 538 | if (is_our && (SvPAD_OUR(sv))) |
7f73a9f1 | 539 | break; /* "our" masking "our" */ |
dd2155a4 DM |
540 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
541 | "\"%s\" variable %s masks earlier declaration in same %s", | |
542 | (is_our ? "our" : "my"), | |
543 | name, | |
544 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); | |
545 | --off; | |
546 | break; | |
547 | } | |
548 | } | |
549 | /* check the rest of the pad */ | |
550 | if (is_our) { | |
551 | do { | |
53c1dcc0 AL |
552 | SV * const sv = svp[off]; |
553 | if (sv | |
dd2155a4 | 554 | && sv != &PL_sv_undef |
ee6cee0c | 555 | && !SvFAKE(sv) |
dd2155a4 | 556 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
035dab74 | 557 | && OURSTASH(sv) == ourstash |
b15aece3 | 558 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 DM |
559 | { |
560 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
561 | "\"our\" variable %s redeclared", name); | |
624f69f5 | 562 | if ((I32)off <= PL_comppad_name_floor) |
7f73a9f1 RGS |
563 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
564 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
dd2155a4 DM |
565 | break; |
566 | } | |
567 | } while ( off-- > 0 ); | |
568 | } | |
569 | } | |
570 | ||
571 | ||
dd2155a4 DM |
572 | /* |
573 | =for apidoc pad_findmy | |
574 | ||
575 | Given a lexical name, try to find its offset, first in the current pad, | |
576 | or failing that, in the pads of any lexically enclosing subs (including | |
577 | the complications introduced by eval). If the name is found in an outer pad, | |
578 | then a fake entry is added to the current pad. | |
579 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
580 | ||
581 | =cut | |
582 | */ | |
583 | ||
584 | PADOFFSET | |
e1ec3a88 | 585 | Perl_pad_findmy(pTHX_ const char *name) |
dd2155a4 | 586 | { |
97aff369 | 587 | dVAR; |
b5c19bd7 DM |
588 | SV *out_sv; |
589 | int out_flags; | |
929a0744 | 590 | I32 offset; |
e1ec3a88 | 591 | const AV *nameav; |
929a0744 | 592 | SV **name_svp; |
dd2155a4 | 593 | |
1dba731d | 594 | pad_peg("pad_findmy"); |
929a0744 | 595 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
4608196e | 596 | NULL, &out_sv, &out_flags); |
929a0744 DM |
597 | if (offset != NOT_IN_PAD) |
598 | return offset; | |
599 | ||
600 | /* look for an our that's being introduced; this allows | |
601 | * our $foo = 0 unless defined $foo; | |
602 | * to not give a warning. (Yes, this is a hack) */ | |
603 | ||
604 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; | |
605 | name_svp = AvARRAY(nameav); | |
606 | for (offset = AvFILLp(nameav); offset > 0; offset--) { | |
551405c4 | 607 | const SV * const namesv = name_svp[offset]; |
929a0744 DM |
608 | if (namesv && namesv != &PL_sv_undef |
609 | && !SvFAKE(namesv) | |
00b1698f | 610 | && (SvPAD_OUR(namesv)) |
b15aece3 | 611 | && strEQ(SvPVX_const(namesv), name) |
4cf4a199 | 612 | && U_32(SvNVX(namesv)) == PAD_MAX /* min */ |
929a0744 DM |
613 | ) |
614 | return offset; | |
615 | } | |
616 | return NOT_IN_PAD; | |
dd2155a4 DM |
617 | } |
618 | ||
e1f795dc RGS |
619 | /* |
620 | * Returns the offset of a lexical $_, if there is one, at run time. | |
621 | * Used by the UNDERBAR XS macro. | |
622 | */ | |
623 | ||
624 | PADOFFSET | |
29289021 | 625 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc | 626 | { |
97aff369 | 627 | dVAR; |
e1f795dc RGS |
628 | SV *out_sv; |
629 | int out_flags; | |
630 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, | |
4608196e | 631 | NULL, &out_sv, &out_flags); |
e1f795dc | 632 | } |
dd2155a4 | 633 | |
dd2155a4 DM |
634 | /* |
635 | =for apidoc pad_findlex | |
636 | ||
637 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
b5c19bd7 DM |
638 | in the inner pads if it's found in an outer one. |
639 | ||
640 | Returns the offset in the bottom pad of the lex or the fake lex. | |
641 | cv is the CV in which to start the search, and seq is the current cop_seq | |
642 | to match against. If warn is true, print appropriate warnings. The out_* | |
643 | vars return values, and so are pointers to where the returned values | |
644 | should be stored. out_capture, if non-null, requests that the innermost | |
645 | instance of the lexical is captured; out_name_sv is set to the innermost | |
646 | matched namesv or fake namesv; out_flags returns the flags normally | |
647 | associated with the IVX field of a fake namesv. | |
648 | ||
649 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, | |
650 | then comes back down, adding fake entries as it goes. It has to be this way | |
651 | because fake namesvs in anon protoypes have to store in NVX the index into | |
652 | the parent pad. | |
dd2155a4 DM |
653 | |
654 | =cut | |
655 | */ | |
656 | ||
b5c19bd7 DM |
657 | /* Flags set in the SvIVX field of FAKE namesvs */ |
658 | ||
659 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ | |
660 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ | |
661 | ||
662 | /* the CV has finished being compiled. This is not a sufficient test for | |
663 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
664 | #define CvCOMPILED(cv) CvROOT(cv) | |
665 | ||
71f882da DM |
666 | /* the CV does late binding of its lexicals */ |
667 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) | |
668 | ||
b5c19bd7 | 669 | |
dd2155a4 | 670 | STATIC PADOFFSET |
e1ec3a88 | 671 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
b5c19bd7 | 672 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 | 673 | { |
97aff369 | 674 | dVAR; |
b5c19bd7 DM |
675 | I32 offset, new_offset; |
676 | SV *new_capture; | |
677 | SV **new_capturep; | |
b64e5050 | 678 | const AV * const padlist = CvPADLIST(cv); |
dd2155a4 | 679 | |
b5c19bd7 | 680 | *out_flags = 0; |
a3985cdc | 681 | |
b5c19bd7 DM |
682 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
683 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", | |
684 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); | |
dd2155a4 | 685 | |
b5c19bd7 | 686 | /* first, search this pad */ |
dd2155a4 | 687 | |
b5c19bd7 DM |
688 | if (padlist) { /* not an undef CV */ |
689 | I32 fake_offset = 0; | |
551405c4 AL |
690 | const AV * const nameav = (AV*)AvARRAY(padlist)[0]; |
691 | SV * const * const name_svp = AvARRAY(nameav); | |
ee6cee0c | 692 | |
b5c19bd7 | 693 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
551405c4 | 694 | const SV * const namesv = name_svp[offset]; |
b5c19bd7 | 695 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 696 | && strEQ(SvPVX_const(namesv), name)) |
b5c19bd7 DM |
697 | { |
698 | if (SvFAKE(namesv)) | |
699 | fake_offset = offset; /* in case we don't find a real one */ | |
4cf4a199 JH |
700 | else if ( seq > U_32(SvNVX(namesv)) /* min */ |
701 | && seq <= (U32)SvIVX(namesv)) /* max */ | |
b5c19bd7 | 702 | break; |
ee6cee0c DM |
703 | } |
704 | } | |
705 | ||
b5c19bd7 DM |
706 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
707 | if (offset > 0) { /* not fake */ | |
708 | fake_offset = 0; | |
709 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
710 | ||
711 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
712 | * instances. For now, we just test !CvUNIQUE(cv), but | |
713 | * ideally, we should detect my's declared within loops | |
714 | * etc - this would allow a wider range of 'not stayed | |
715 | * shared' warnings. We also treated alreadly-compiled | |
716 | * lexes as not multi as viewed from evals. */ | |
717 | ||
718 | *out_flags = CvANON(cv) ? | |
719 | PAD_FAKELEX_ANON : | |
720 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
721 | ? PAD_FAKELEX_MULTI : 0; | |
722 | ||
723 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
724 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", | |
4cf4a199 | 725 | PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), |
b5c19bd7 DM |
726 | (long)SvIVX(*out_name_sv))); |
727 | } | |
728 | else { /* fake match */ | |
729 | offset = fake_offset; | |
730 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
731 | *out_flags = SvIVX(*out_name_sv); | |
732 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
19a5c512 | 733 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 DM |
734 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
735 | (unsigned long)SvNVX(*out_name_sv) | |
736 | )); | |
737 | } | |
dd2155a4 | 738 | |
b5c19bd7 | 739 | /* return the lex? */ |
dd2155a4 | 740 | |
b5c19bd7 | 741 | if (out_capture) { |
dd2155a4 | 742 | |
b5c19bd7 | 743 | /* our ? */ |
00b1698f | 744 | if (SvPAD_OUR(*out_name_sv)) { |
a0714e2c | 745 | *out_capture = NULL; |
b5c19bd7 DM |
746 | return offset; |
747 | } | |
ee6cee0c | 748 | |
b5c19bd7 DM |
749 | /* trying to capture from an anon prototype? */ |
750 | if (CvCOMPILED(cv) | |
751 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
752 | : *out_flags & PAD_FAKELEX_ANON) | |
753 | { | |
754 | if (warn && ckWARN(WARN_CLOSURE)) | |
755 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
756 | "Variable \"%s\" is not available", name); | |
a0714e2c | 757 | *out_capture = NULL; |
b5c19bd7 | 758 | } |
ee6cee0c | 759 | |
b5c19bd7 DM |
760 | /* real value */ |
761 | else { | |
762 | int newwarn = warn; | |
763 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
764 | && warn && ckWARN(WARN_CLOSURE)) { | |
765 | newwarn = 0; | |
766 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
767 | "Variable \"%s\" will not stay shared", name); | |
768 | } | |
dd2155a4 | 769 | |
b5c19bd7 DM |
770 | if (fake_offset && CvANON(cv) |
771 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
772 | { | |
773 | SV *n; | |
774 | /* not yet caught - look further up */ | |
775 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
776 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", | |
777 | PTR2UV(cv))); | |
778 | n = *out_name_sv; | |
282e1742 DM |
779 | (void) pad_findlex(name, CvOUTSIDE(cv), |
780 | CvOUTSIDE_SEQ(cv), | |
b5c19bd7 DM |
781 | newwarn, out_capture, out_name_sv, out_flags); |
782 | *out_name_sv = n; | |
783 | return offset; | |
dd2155a4 | 784 | } |
b5c19bd7 DM |
785 | |
786 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ | |
787 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; | |
788 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
789 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", | |
19a5c512 | 790 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 DM |
791 | |
792 | if (SvPADSTALE(*out_capture)) { | |
793 | if (ckWARN(WARN_CLOSURE)) | |
ee6cee0c | 794 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 | 795 | "Variable \"%s\" is not available", name); |
a0714e2c | 796 | *out_capture = NULL; |
dd2155a4 DM |
797 | } |
798 | } | |
b5c19bd7 DM |
799 | if (!*out_capture) { |
800 | if (*name == '@') | |
801 | *out_capture = sv_2mortal((SV*)newAV()); | |
802 | else if (*name == '%') | |
803 | *out_capture = sv_2mortal((SV*)newHV()); | |
804 | else | |
805 | *out_capture = sv_newmortal(); | |
806 | } | |
dd2155a4 | 807 | } |
b5c19bd7 DM |
808 | |
809 | return offset; | |
ee6cee0c | 810 | } |
b5c19bd7 DM |
811 | } |
812 | ||
813 | /* it's not in this pad - try above */ | |
814 | ||
815 | if (!CvOUTSIDE(cv)) | |
816 | return NOT_IN_PAD; | |
817 | ||
818 | /* out_capture non-null means caller wants us to capture lex; in | |
71f882da | 819 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 820 | new_capturep = out_capture ? out_capture : |
4608196e | 821 | CvLATE(cv) ? NULL : &new_capture; |
b5c19bd7 DM |
822 | |
823 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
824 | new_capturep, out_name_sv, out_flags); | |
825 | if (offset == NOT_IN_PAD) | |
826 | return NOT_IN_PAD; | |
827 | ||
828 | /* found in an outer CV. Add appropriate fake entry to this pad */ | |
829 | ||
830 | /* don't add new fake entries (via eval) to CVs that we have already | |
831 | * finished compiling, or to undef CVs */ | |
832 | if (CvCOMPILED(cv) || !padlist) | |
833 | return 0; /* this dummy (and invalid) value isnt used by the caller */ | |
834 | ||
835 | { | |
836 | SV *new_namesv; | |
53c1dcc0 AL |
837 | AV * const ocomppad_name = PL_comppad_name; |
838 | PAD * const ocomppad = PL_comppad; | |
b5c19bd7 DM |
839 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
840 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
841 | PL_curpad = AvARRAY(PL_comppad); | |
842 | ||
843 | new_offset = pad_add_name( | |
b15aece3 | 844 | SvPVX_const(*out_name_sv), |
00b1698f | 845 | SvPAD_TYPED(*out_name_sv) |
5c284bb0 | 846 | ? SvSTASH(*out_name_sv) : NULL, |
035dab74 | 847 | OURSTASH(*out_name_sv), |
b5c19bd7 DM |
848 | 1 /* fake */ |
849 | ); | |
850 | ||
851 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; | |
b19bbeda | 852 | SvIV_set(new_namesv, *out_flags); |
b5c19bd7 | 853 | |
9d6ce603 | 854 | SvNV_set(new_namesv, (NV)0); |
00b1698f | 855 | if (SvPAD_OUR(new_namesv)) { |
bb263b4e | 856 | /*EMPTY*/; /* do nothing */ |
b5c19bd7 | 857 | } |
71f882da | 858 | else if (CvLATE(cv)) { |
b5c19bd7 | 859 | /* delayed creation - just note the offset within parent pad */ |
9d6ce603 | 860 | SvNV_set(new_namesv, (NV)offset); |
b5c19bd7 DM |
861 | CvCLONE_on(cv); |
862 | } | |
863 | else { | |
864 | /* immediate creation - capture outer value right now */ | |
865 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
866 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
867 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", | |
868 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
dd2155a4 | 869 | } |
b5c19bd7 DM |
870 | *out_name_sv = new_namesv; |
871 | *out_flags = SvIVX(new_namesv); | |
872 | ||
873 | PL_comppad_name = ocomppad_name; | |
874 | PL_comppad = ocomppad; | |
4608196e | 875 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL; |
dd2155a4 | 876 | } |
b5c19bd7 | 877 | return new_offset; |
dd2155a4 DM |
878 | } |
879 | ||
fb8a9836 AL |
880 | |
881 | #ifdef DEBUGGING | |
dd2155a4 DM |
882 | /* |
883 | =for apidoc pad_sv | |
884 | ||
885 | Get the value at offset po in the current pad. | |
886 | Use macro PAD_SV instead of calling this function directly. | |
887 | ||
888 | =cut | |
889 | */ | |
890 | ||
891 | ||
892 | SV * | |
893 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
894 | { | |
97aff369 | 895 | dVAR; |
f3548bdc | 896 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 897 | |
dd2155a4 DM |
898 | if (!po) |
899 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
900 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
901 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 902 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
903 | ); |
904 | return PL_curpad[po]; | |
905 | } | |
906 | ||
907 | ||
908 | /* | |
909 | =for apidoc pad_setsv | |
910 | ||
911 | Set the entry at offset po in the current pad to sv. | |
912 | Use the macro PAD_SETSV() rather than calling this function directly. | |
913 | ||
914 | =cut | |
915 | */ | |
916 | ||
dd2155a4 DM |
917 | void |
918 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
919 | { | |
97aff369 | 920 | dVAR; |
f3548bdc | 921 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
922 | |
923 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
924 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 925 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
926 | ); |
927 | PL_curpad[po] = sv; | |
928 | } | |
929 | #endif | |
930 | ||
931 | ||
932 | ||
933 | /* | |
934 | =for apidoc pad_block_start | |
935 | ||
936 | Update the pad compilation state variables on entry to a new block | |
937 | ||
938 | =cut | |
939 | */ | |
940 | ||
941 | /* XXX DAPM perhaps: | |
942 | * - integrate this in general state-saving routine ??? | |
943 | * - combine with the state-saving going on in pad_new ??? | |
944 | * - introduce a new SAVE type that does all this in one go ? | |
945 | */ | |
946 | ||
947 | void | |
948 | Perl_pad_block_start(pTHX_ int full) | |
949 | { | |
97aff369 | 950 | dVAR; |
f3548bdc | 951 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
952 | SAVEI32(PL_comppad_name_floor); |
953 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
954 | if (full) | |
955 | PL_comppad_name_fill = PL_comppad_name_floor; | |
956 | if (PL_comppad_name_floor < 0) | |
957 | PL_comppad_name_floor = 0; | |
958 | SAVEI32(PL_min_intro_pending); | |
959 | SAVEI32(PL_max_intro_pending); | |
960 | PL_min_intro_pending = 0; | |
961 | SAVEI32(PL_comppad_name_fill); | |
962 | SAVEI32(PL_padix_floor); | |
963 | PL_padix_floor = PL_padix; | |
964 | PL_pad_reset_pending = FALSE; | |
965 | } | |
966 | ||
967 | ||
968 | /* | |
969 | =for apidoc intro_my | |
970 | ||
971 | "Introduce" my variables to visible status. | |
972 | ||
973 | =cut | |
974 | */ | |
975 | ||
976 | U32 | |
977 | Perl_intro_my(pTHX) | |
978 | { | |
97aff369 | 979 | dVAR; |
dd2155a4 | 980 | SV **svp; |
dd2155a4 DM |
981 | I32 i; |
982 | ||
f3548bdc | 983 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
984 | if (! PL_min_intro_pending) |
985 | return PL_cop_seqmax; | |
986 | ||
987 | svp = AvARRAY(PL_comppad_name); | |
988 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
53c1dcc0 AL |
989 | SV * const sv = svp[i]; |
990 | ||
991 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !SvIVX(sv)) { | |
b19bbeda | 992 | SvIV_set(sv, PAD_MAX); /* Don't know scope end yet. */ |
9d6ce603 | 993 | SvNV_set(sv, (NV)PL_cop_seqmax); |
dd2155a4 | 994 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 | 995 | "Pad intromy: %ld \"%s\", (%ld,%ld)\n", |
b15aece3 | 996 | (long)i, SvPVX_const(sv), |
4cf4a199 | 997 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
998 | ); |
999 | } | |
1000 | } | |
1001 | PL_min_intro_pending = 0; | |
1002 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
1003 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1004 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
1005 | ||
1006 | return PL_cop_seqmax++; | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | =for apidoc pad_leavemy | |
1011 | ||
1012 | Cleanup at end of scope during compilation: set the max seq number for | |
1013 | lexicals in this scope and warn of any lexicals that never got introduced. | |
1014 | ||
1015 | =cut | |
1016 | */ | |
1017 | ||
1018 | void | |
1019 | Perl_pad_leavemy(pTHX) | |
1020 | { | |
97aff369 | 1021 | dVAR; |
dd2155a4 | 1022 | I32 off; |
551405c4 | 1023 | SV * const * const svp = AvARRAY(PL_comppad_name); |
dd2155a4 DM |
1024 | |
1025 | PL_pad_reset_pending = FALSE; | |
1026 | ||
f3548bdc | 1027 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
1028 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
1029 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
53c1dcc0 AL |
1030 | const SV * const sv = svp[off]; |
1031 | if (sv && sv != &PL_sv_undef | |
ee6cee0c | 1032 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
dd2155a4 | 1033 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
35c1215d | 1034 | "%"SVf" never introduced", sv); |
dd2155a4 DM |
1035 | } |
1036 | } | |
1037 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
1038 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
53c1dcc0 AL |
1039 | const SV * const sv = svp[off]; |
1040 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) { | |
b19bbeda | 1041 | SvIV_set(sv, PL_cop_seqmax); |
dd2155a4 | 1042 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 | 1043 | "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", |
b15aece3 | 1044 | (long)off, SvPVX_const(sv), |
4cf4a199 | 1045 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 DM |
1046 | ); |
1047 | } | |
1048 | } | |
1049 | PL_cop_seqmax++; | |
1050 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1051 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1052 | } | |
1053 | ||
1054 | ||
1055 | /* | |
1056 | =for apidoc pad_swipe | |
1057 | ||
1058 | Abandon the tmp in the current pad at offset po and replace with a | |
1059 | new one. | |
1060 | ||
1061 | =cut | |
1062 | */ | |
1063 | ||
1064 | void | |
1065 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1066 | { | |
97aff369 | 1067 | dVAR; |
f3548bdc | 1068 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
1069 | if (!PL_curpad) |
1070 | return; | |
1071 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1072 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1073 | if (!po) | |
1074 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1075 | ||
1076 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1077 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1078 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1079 | ||
1080 | if (PL_curpad[po]) | |
1081 | SvPADTMP_off(PL_curpad[po]); | |
1082 | if (refadjust) | |
1083 | SvREFCNT_dec(PL_curpad[po]); | |
1084 | ||
9ad9869c DM |
1085 | |
1086 | /* if pad tmps aren't shared between ops, then there's no need to | |
1087 | * create a new tmp when an existing op is freed */ | |
1088 | #ifdef USE_BROKEN_PAD_RESET | |
561b68a9 | 1089 | PL_curpad[po] = newSV(0); |
dd2155a4 | 1090 | SvPADTMP_on(PL_curpad[po]); |
9ad9869c DM |
1091 | #else |
1092 | PL_curpad[po] = &PL_sv_undef; | |
97bf4a8d | 1093 | #endif |
dd2155a4 DM |
1094 | if ((I32)po < PL_padix) |
1095 | PL_padix = po - 1; | |
1096 | } | |
1097 | ||
1098 | ||
1099 | /* | |
1100 | =for apidoc pad_reset | |
1101 | ||
1102 | Mark all the current temporaries for reuse | |
1103 | ||
1104 | =cut | |
1105 | */ | |
1106 | ||
1107 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1108 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1109 | * on the stack by OPs that use them, there are several ways to get an alias | |
1110 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1111 | * We avoid doing this until we can think of a Better Way. | |
1112 | * GSAR 97-10-29 */ | |
1113 | void | |
1114 | Perl_pad_reset(pTHX) | |
1115 | { | |
97aff369 | 1116 | dVAR; |
dd2155a4 | 1117 | #ifdef USE_BROKEN_PAD_RESET |
dd2155a4 DM |
1118 | if (AvARRAY(PL_comppad) != PL_curpad) |
1119 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1120 | ||
1121 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1122 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1123 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1124 | (long)PL_padix, (long)PL_padix_floor | |
1125 | ) | |
1126 | ); | |
1127 | ||
1128 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
e1ec3a88 | 1129 | register I32 po; |
dd2155a4 DM |
1130 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1131 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1132 | SvPADTMP_off(PL_curpad[po]); | |
1133 | } | |
1134 | PL_padix = PL_padix_floor; | |
1135 | } | |
1136 | #endif | |
1137 | PL_pad_reset_pending = FALSE; | |
1138 | } | |
1139 | ||
1140 | ||
1141 | /* | |
1142 | =for apidoc pad_tidy | |
1143 | ||
1144 | Tidy up a pad after we've finished compiling it: | |
1145 | * remove most stuff from the pads of anonsub prototypes; | |
1146 | * give it a @_; | |
1147 | * mark tmps as such. | |
1148 | ||
1149 | =cut | |
1150 | */ | |
1151 | ||
1152 | /* XXX DAPM surely most of this stuff should be done properly | |
1153 | * at the right time beforehand, rather than going around afterwards | |
1154 | * cleaning up our mistakes ??? | |
1155 | */ | |
1156 | ||
1157 | void | |
1158 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1159 | { | |
27da23d5 | 1160 | dVAR; |
dd2155a4 | 1161 | |
f3548bdc | 1162 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 DM |
1163 | |
1164 | /* If this CV has had any 'eval-capable' ops planted in it | |
1165 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any | |
1166 | * anon prototypes in the chain of CVs should be marked as cloneable, | |
1167 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets | |
1168 | * the right CvOUTSIDE. | |
1169 | * If running with -d, *any* sub may potentially have an eval | |
1170 | * excuted within it. | |
1171 | */ | |
1172 | ||
1173 | if (PL_cv_has_eval || PL_perldb) { | |
e1ec3a88 | 1174 | const CV *cv; |
b5c19bd7 DM |
1175 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1176 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1177 | break; /* no need to mark already-compiled code */ | |
1178 | if (CvANON(cv)) { | |
1179 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1180 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); | |
1181 | CvCLONE_on(cv); | |
1182 | } | |
1183 | } | |
1184 | } | |
1185 | ||
dd2155a4 DM |
1186 | /* extend curpad to match namepad */ |
1187 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
a0714e2c | 1188 | av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
dd2155a4 DM |
1189 | |
1190 | if (type == padtidy_SUBCLONE) { | |
551405c4 | 1191 | SV * const * const namep = AvARRAY(PL_comppad_name); |
504618e9 | 1192 | PADOFFSET ix; |
b5c19bd7 | 1193 | |
dd2155a4 DM |
1194 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1195 | SV *namesv; | |
1196 | ||
1197 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1198 | continue; | |
1199 | /* | |
1200 | * The only things that a clonable function needs in its | |
b5c19bd7 | 1201 | * pad are anonymous subs. |
dd2155a4 DM |
1202 | * The rest are created anew during cloning. |
1203 | */ | |
a0714e2c | 1204 | if (!((namesv = namep[ix]) != NULL && |
dd2155a4 | 1205 | namesv != &PL_sv_undef && |
b15aece3 | 1206 | *SvPVX_const(namesv) == '&')) |
dd2155a4 DM |
1207 | { |
1208 | SvREFCNT_dec(PL_curpad[ix]); | |
a0714e2c | 1209 | PL_curpad[ix] = NULL; |
dd2155a4 DM |
1210 | } |
1211 | } | |
1212 | } | |
1213 | else if (type == padtidy_SUB) { | |
1214 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
53c1dcc0 | 1215 | AV * const av = newAV(); /* Will be @_ */ |
dd2155a4 DM |
1216 | av_extend(av, 0); |
1217 | av_store(PL_comppad, 0, (SV*)av); | |
11ca45c0 | 1218 | AvREIFY_only(av); |
dd2155a4 DM |
1219 | } |
1220 | ||
1221 | /* XXX DAPM rationalise these two similar branches */ | |
1222 | ||
1223 | if (type == padtidy_SUB) { | |
504618e9 | 1224 | PADOFFSET ix; |
dd2155a4 DM |
1225 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1226 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1227 | continue; | |
1228 | if (!SvPADMY(PL_curpad[ix])) | |
1229 | SvPADTMP_on(PL_curpad[ix]); | |
1230 | } | |
1231 | } | |
1232 | else if (type == padtidy_FORMAT) { | |
504618e9 | 1233 | PADOFFSET ix; |
dd2155a4 DM |
1234 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1235 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1236 | SvPADTMP_on(PL_curpad[ix]); | |
1237 | } | |
1238 | } | |
f3548bdc | 1239 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1240 | } |
1241 | ||
1242 | ||
1243 | /* | |
1244 | =for apidoc pad_free | |
1245 | ||
8627550a | 1246 | Free the SV at offset po in the current pad. |
dd2155a4 DM |
1247 | |
1248 | =cut | |
1249 | */ | |
1250 | ||
1251 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1252 | void | |
1253 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1254 | { | |
97aff369 | 1255 | dVAR; |
f3548bdc | 1256 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1257 | if (!PL_curpad) |
1258 | return; | |
1259 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1260 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1261 | if (!po) | |
1262 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1263 | ||
1264 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1265 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1266 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1267 | ); | |
1268 | ||
1269 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1270 | SvPADTMP_off(PL_curpad[po]); | |
1271 | #ifdef USE_ITHREADS | |
7e736055 HS |
1272 | /* SV could be a shared hash key (eg bugid #19022) */ |
1273 | if ( | |
f8c7b90f | 1274 | #ifdef PERL_OLD_COPY_ON_WRITE |
7e736055 HS |
1275 | !SvIsCOW(PL_curpad[po]) |
1276 | #else | |
1277 | !SvFAKE(PL_curpad[po]) | |
dd2155a4 | 1278 | #endif |
7e736055 | 1279 | ) |
dd2155a4 | 1280 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1281 | #endif |
1282 | } | |
1283 | if ((I32)po < PL_padix) | |
1284 | PL_padix = po - 1; | |
1285 | } | |
1286 | ||
1287 | ||
1288 | ||
1289 | /* | |
1290 | =for apidoc do_dump_pad | |
1291 | ||
1292 | Dump the contents of a padlist | |
1293 | ||
1294 | =cut | |
1295 | */ | |
1296 | ||
1297 | void | |
1298 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1299 | { | |
97aff369 | 1300 | dVAR; |
e1ec3a88 AL |
1301 | const AV *pad_name; |
1302 | const AV *pad; | |
dd2155a4 DM |
1303 | SV **pname; |
1304 | SV **ppad; | |
dd2155a4 DM |
1305 | I32 ix; |
1306 | ||
1307 | if (!padlist) { | |
1308 | return; | |
1309 | } | |
1310 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1311 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1312 | pname = AvARRAY(pad_name); | |
1313 | ppad = AvARRAY(pad); | |
1314 | Perl_dump_indent(aTHX_ level, file, | |
1315 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1316 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1317 | ); | |
1318 | ||
1319 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
e1ec3a88 | 1320 | const SV *namesv = pname[ix]; |
dd2155a4 | 1321 | if (namesv && namesv == &PL_sv_undef) { |
a0714e2c | 1322 | namesv = NULL; |
dd2155a4 DM |
1323 | } |
1324 | if (namesv) { | |
ee6cee0c DM |
1325 | if (SvFAKE(namesv)) |
1326 | Perl_dump_indent(aTHX_ level+1, file, | |
c0fd1b42 | 1327 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c DM |
1328 | (int) ix, |
1329 | PTR2UV(ppad[ix]), | |
1330 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
b15aece3 | 1331 | SvPVX_const(namesv), |
b5c19bd7 DM |
1332 | (unsigned long)SvIVX(namesv), |
1333 | (unsigned long)SvNVX(namesv) | |
1334 | ||
ee6cee0c DM |
1335 | ); |
1336 | else | |
1337 | Perl_dump_indent(aTHX_ level+1, file, | |
b5c19bd7 | 1338 | "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", |
ee6cee0c DM |
1339 | (int) ix, |
1340 | PTR2UV(ppad[ix]), | |
1341 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
4cf4a199 | 1342 | (long)U_32(SvNVX(namesv)), |
b5c19bd7 | 1343 | (long)SvIVX(namesv), |
b15aece3 | 1344 | SvPVX_const(namesv) |
ee6cee0c | 1345 | ); |
dd2155a4 DM |
1346 | } |
1347 | else if (full) { | |
1348 | Perl_dump_indent(aTHX_ level+1, file, | |
1349 | "%2d. 0x%"UVxf"<%lu>\n", | |
1350 | (int) ix, | |
1351 | PTR2UV(ppad[ix]), | |
1352 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1353 | ); | |
1354 | } | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | ||
1359 | ||
1360 | /* | |
1361 | =for apidoc cv_dump | |
1362 | ||
1363 | dump the contents of a CV | |
1364 | ||
1365 | =cut | |
1366 | */ | |
1367 | ||
1368 | #ifdef DEBUGGING | |
1369 | STATIC void | |
e1ec3a88 | 1370 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 | 1371 | { |
97aff369 | 1372 | dVAR; |
53c1dcc0 AL |
1373 | const CV * const outside = CvOUTSIDE(cv); |
1374 | AV* const padlist = CvPADLIST(cv); | |
dd2155a4 DM |
1375 | |
1376 | PerlIO_printf(Perl_debug_log, | |
1377 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1378 | title, | |
1379 | PTR2UV(cv), | |
1380 | (CvANON(cv) ? "ANON" | |
71f882da | 1381 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 DM |
1382 | : (cv == PL_main_cv) ? "MAIN" |
1383 | : CvUNIQUE(cv) ? "UNIQUE" | |
1384 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1385 | PTR2UV(outside), | |
1386 | (!outside ? "null" | |
1387 | : CvANON(outside) ? "ANON" | |
1388 | : (outside == PL_main_cv) ? "MAIN" | |
1389 | : CvUNIQUE(outside) ? "UNIQUE" | |
1390 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1391 | ||
1392 | PerlIO_printf(Perl_debug_log, | |
1393 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1394 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1395 | } | |
1396 | #endif /* DEBUGGING */ | |
1397 | ||
1398 | ||
1399 | ||
1400 | ||
1401 | ||
1402 | /* | |
1403 | =for apidoc cv_clone | |
1404 | ||
1405 | Clone a CV: make a new CV which points to the same code etc, but which | |
1406 | has a newly-created pad built by copying the prototype pad and capturing | |
1407 | any outer lexicals. | |
1408 | ||
1409 | =cut | |
1410 | */ | |
1411 | ||
1412 | CV * | |
1413 | Perl_cv_clone(pTHX_ CV *proto) | |
1414 | { | |
27da23d5 | 1415 | dVAR; |
dd2155a4 | 1416 | I32 ix; |
53c1dcc0 AL |
1417 | AV* const protopadlist = CvPADLIST(proto); |
1418 | const AV* const protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); | |
1419 | const AV* const protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
1420 | SV** const pname = AvARRAY(protopad_name); | |
1421 | SV** const ppad = AvARRAY(protopad); | |
e1ec3a88 AL |
1422 | const I32 fname = AvFILLp(protopad_name); |
1423 | const I32 fpad = AvFILLp(protopad); | |
dd2155a4 | 1424 | CV* cv; |
b5c19bd7 DM |
1425 | SV** outpad; |
1426 | CV* outside; | |
71f882da | 1427 | long depth; |
dd2155a4 DM |
1428 | |
1429 | assert(!CvUNIQUE(proto)); | |
1430 | ||
71f882da DM |
1431 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1432 | * to a prototype; we instead want the cloned parent who called us. | |
1433 | * Note that in general for formats, CvOUTSIDE != find_runcv */ | |
1434 | ||
1435 | outside = CvOUTSIDE(proto); | |
1436 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) | |
1437 | outside = find_runcv(NULL); | |
1438 | depth = CvDEPTH(outside); | |
1439 | assert(depth || SvTYPE(proto) == SVt_PVFM); | |
1440 | if (!depth) | |
1441 | depth = 1; | |
b5c19bd7 DM |
1442 | assert(CvPADLIST(outside)); |
1443 | ||
dd2155a4 DM |
1444 | ENTER; |
1445 | SAVESPTR(PL_compcv); | |
1446 | ||
561b68a9 | 1447 | cv = PL_compcv = (CV*)newSV(0); |
dd2155a4 | 1448 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
7dafbf52 | 1449 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 DM |
1450 | CvCLONED_on(cv); |
1451 | ||
dd2155a4 | 1452 | #ifdef USE_ITHREADS |
aed2304a NC |
1453 | CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto) |
1454 | : savepv(CvFILE(proto)); | |
dd2155a4 DM |
1455 | #else |
1456 | CvFILE(cv) = CvFILE(proto); | |
1457 | #endif | |
1458 | CvGV(cv) = CvGV(proto); | |
1459 | CvSTASH(cv) = CvSTASH(proto); | |
b34c0dd4 | 1460 | OP_REFCNT_LOCK; |
dd2155a4 | 1461 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 | 1462 | OP_REFCNT_UNLOCK; |
dd2155a4 | 1463 | CvSTART(cv) = CvSTART(proto); |
b37c2d43 | 1464 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc_simple(outside); |
b5c19bd7 | 1465 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
dd2155a4 DM |
1466 | |
1467 | if (SvPOK(proto)) | |
b15aece3 | 1468 | sv_setpvn((SV*)cv, SvPVX_const(proto), SvCUR(proto)); |
dd2155a4 | 1469 | |
b7787f18 | 1470 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
dd2155a4 | 1471 | |
b5c19bd7 | 1472 | av_fill(PL_comppad, fpad); |
dd2155a4 DM |
1473 | for (ix = fname; ix >= 0; ix--) |
1474 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1475 | ||
dd2155a4 DM |
1476 | PL_curpad = AvARRAY(PL_comppad); |
1477 | ||
71f882da | 1478 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 | 1479 | |
dd2155a4 | 1480 | for (ix = fpad; ix > 0; ix--) { |
a0714e2c SS |
1481 | SV* const namesv = (ix <= fname) ? pname[ix] : NULL; |
1482 | SV *sv = NULL; | |
71f882da | 1483 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
b5c19bd7 | 1484 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
71f882da DM |
1485 | sv = outpad[(I32)SvNVX(namesv)]; |
1486 | assert(sv); | |
1487 | /* formats may have an inactive parent */ | |
1488 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { | |
1489 | if (ckWARN(WARN_CLOSURE)) | |
1490 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
b15aece3 | 1491 | "Variable \"%s\" is not available", SvPVX_const(namesv)); |
a0714e2c | 1492 | sv = NULL; |
71f882da DM |
1493 | } |
1494 | else { | |
1495 | assert(!SvPADSTALE(sv)); | |
f84c484e | 1496 | SvREFCNT_inc_simple_void_NN(sv); |
71f882da | 1497 | } |
dd2155a4 | 1498 | } |
71f882da | 1499 | if (!sv) { |
b15aece3 | 1500 | const char sigil = SvPVX_const(namesv)[0]; |
e1ec3a88 | 1501 | if (sigil == '&') |
dd2155a4 | 1502 | sv = SvREFCNT_inc(ppad[ix]); |
e1ec3a88 | 1503 | else if (sigil == '@') |
dd2155a4 | 1504 | sv = (SV*)newAV(); |
e1ec3a88 | 1505 | else if (sigil == '%') |
dd2155a4 DM |
1506 | sv = (SV*)newHV(); |
1507 | else | |
561b68a9 | 1508 | sv = newSV(0); |
235cc2e3 | 1509 | SvPADMY_on(sv); |
dd2155a4 DM |
1510 | } |
1511 | } | |
1512 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
f84c484e | 1513 | sv = SvREFCNT_inc_NN(ppad[ix]); |
dd2155a4 DM |
1514 | } |
1515 | else { | |
561b68a9 | 1516 | sv = newSV(0); |
dd2155a4 | 1517 | SvPADTMP_on(sv); |
dd2155a4 | 1518 | } |
71f882da | 1519 | PL_curpad[ix] = sv; |
dd2155a4 DM |
1520 | } |
1521 | ||
dd2155a4 DM |
1522 | DEBUG_Xv( |
1523 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1524 | cv_dump(outside, "Outside"); | |
1525 | cv_dump(proto, "Proto"); | |
1526 | cv_dump(cv, "To"); | |
1527 | ); | |
1528 | ||
1529 | LEAVE; | |
1530 | ||
1531 | if (CvCONST(cv)) { | |
b5c19bd7 DM |
1532 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1533 | * The prototype was marked as a candiate for const-ization, | |
1534 | * so try to grab the current const value, and if successful, | |
1535 | * turn into a const sub: | |
1536 | */ | |
551405c4 | 1537 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 DM |
1538 | if (const_sv) { |
1539 | SvREFCNT_dec(cv); | |
bd61b366 | 1540 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); |
b5c19bd7 DM |
1541 | } |
1542 | else { | |
1543 | CvCONST_off(cv); | |
1544 | } | |
dd2155a4 DM |
1545 | } |
1546 | ||
1547 | return cv; | |
1548 | } | |
1549 | ||
1550 | ||
1551 | /* | |
1552 | =for apidoc pad_fixup_inner_anons | |
1553 | ||
1554 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1555 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1556 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1557 | |
1558 | =cut | |
1559 | */ | |
1560 | ||
1561 | void | |
1562 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1563 | { | |
97aff369 | 1564 | dVAR; |
dd2155a4 | 1565 | I32 ix; |
66a1b24b AL |
1566 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
1567 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; | |
53c1dcc0 AL |
1568 | SV ** const namepad = AvARRAY(comppad_name); |
1569 | SV ** const curpad = AvARRAY(comppad); | |
294a48e9 AL |
1570 | PERL_UNUSED_ARG(old_cv); |
1571 | ||
dd2155a4 | 1572 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
551405c4 | 1573 | const SV * const namesv = namepad[ix]; |
dd2155a4 | 1574 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 1575 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 1576 | { |
46c461b5 | 1577 | CV * const innercv = (CV*)curpad[ix]; |
7dafbf52 DM |
1578 | assert(CvWEAKOUTSIDE(innercv)); |
1579 | assert(CvOUTSIDE(innercv) == old_cv); | |
1580 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1581 | } |
1582 | } | |
1583 | } | |
1584 | ||
7dafbf52 | 1585 | |
dd2155a4 DM |
1586 | /* |
1587 | =for apidoc pad_push | |
1588 | ||
1589 | Push a new pad frame onto the padlist, unless there's already a pad at | |
26019298 AL |
1590 | this depth, in which case don't bother creating a new one. Then give |
1591 | the new pad an @_ in slot zero. | |
dd2155a4 DM |
1592 | |
1593 | =cut | |
1594 | */ | |
1595 | ||
1596 | void | |
26019298 | 1597 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 | 1598 | { |
97aff369 | 1599 | dVAR; |
b37c2d43 | 1600 | if (depth > AvFILLp(padlist)) { |
44f8325f AL |
1601 | SV** const svp = AvARRAY(padlist); |
1602 | AV* const newpad = newAV(); | |
1603 | SV** const oldpad = AvARRAY(svp[depth-1]); | |
dd2155a4 | 1604 | I32 ix = AvFILLp((AV*)svp[1]); |
e1ec3a88 | 1605 | const I32 names_fill = AvFILLp((AV*)svp[0]); |
44f8325f | 1606 | SV** const names = AvARRAY(svp[0]); |
26019298 AL |
1607 | AV *av; |
1608 | ||
dd2155a4 DM |
1609 | for ( ;ix > 0; ix--) { |
1610 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
b15aece3 | 1611 | const char sigil = SvPVX_const(names[ix])[0]; |
26019298 | 1612 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') { |
dd2155a4 DM |
1613 | /* outer lexical or anon code */ |
1614 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1615 | } | |
1616 | else { /* our own lexical */ | |
26019298 AL |
1617 | SV *sv; |
1618 | if (sigil == '@') | |
1619 | sv = (SV*)newAV(); | |
1620 | else if (sigil == '%') | |
1621 | sv = (SV*)newHV(); | |
dd2155a4 | 1622 | else |
561b68a9 | 1623 | sv = newSV(0); |
26019298 | 1624 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1625 | SvPADMY_on(sv); |
1626 | } | |
1627 | } | |
1628 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
f84c484e | 1629 | av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix])); |
dd2155a4 DM |
1630 | } |
1631 | else { | |
1632 | /* save temporaries on recursion? */ | |
561b68a9 | 1633 | SV * const sv = newSV(0); |
26019298 | 1634 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1635 | SvPADTMP_on(sv); |
1636 | } | |
1637 | } | |
26019298 AL |
1638 | av = newAV(); |
1639 | av_extend(av, 0); | |
1640 | av_store(newpad, 0, (SV*)av); | |
11ca45c0 | 1641 | AvREIFY_only(av); |
26019298 | 1642 | |
dd2155a4 DM |
1643 | av_store(padlist, depth, (SV*)newpad); |
1644 | AvFILLp(padlist) = depth; | |
1645 | } | |
1646 | } | |
b21dc031 AL |
1647 | |
1648 | ||
1649 | HV * | |
1650 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) | |
1651 | { | |
97aff369 | 1652 | dVAR; |
551405c4 | 1653 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
00b1698f | 1654 | if ( SvPAD_TYPED(*av) ) { |
b21dc031 AL |
1655 | return SvSTASH(*av); |
1656 | } | |
5c284bb0 | 1657 | return NULL; |
b21dc031 | 1658 | } |
66610fdd RGS |
1659 | |
1660 | /* | |
1661 | * Local variables: | |
1662 | * c-indentation-style: bsd | |
1663 | * c-basic-offset: 4 | |
1664 | * indent-tabs-mode: t | |
1665 | * End: | |
1666 | * | |
37442d52 RGS |
1667 | * ex: set ts=8 sts=4 sw=4 noet: |
1668 | */ |