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dd2155a4 DM |
1 | /* pad.c |
2 | * | |
1129b882 NC |
3 | * Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
4 | * by Larry Wall and others | |
dd2155a4 DM |
5 | * |
6 | * You may distribute under the terms of either the GNU General Public | |
7 | * License or the Artistic License, as specified in the README file. | |
4ac71550 TC |
8 | */ |
9 | ||
10 | /* | |
11 | * 'Anyway: there was this Mr. Frodo left an orphan and stranded, as you | |
12 | * might say, among those queer Bucklanders, being brought up anyhow in | |
13 | * Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc | |
14 | * never had fewer than a couple of hundred relations in the place. | |
15 | * Mr. Bilbo never did a kinder deed than when he brought the lad back | |
16 | * to live among decent folk.' --the Gaffer | |
dd2155a4 | 17 | * |
4ac71550 | 18 | * [p.23 of _The Lord of the Rings_, I/i: "A Long-Expected Party"] |
dd2155a4 DM |
19 | */ |
20 | ||
21 | /* XXX DAPM | |
22 | * As of Sept 2002, this file is new and may be in a state of flux for | |
23 | * a while. I've marked things I intent to come back and look at further | |
24 | * with an 'XXX DAPM' comment. | |
25 | */ | |
26 | ||
27 | /* | |
28 | =head1 Pad Data Structures | |
29 | ||
61296642 | 30 | This file contains the functions that create and manipulate scratchpads, |
166f8a29 | 31 | which are array-of-array data structures attached to a CV (ie a sub) |
61296642 | 32 | and which store lexical variables and opcode temporary and per-thread |
166f8a29 DM |
33 | values. |
34 | ||
dd2155a4 DM |
35 | =for apidoc m|AV *|CvPADLIST|CV *cv |
36 | CV's can have CvPADLIST(cv) set to point to an AV. | |
37 | ||
38 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're | |
39 | not callable at will and are always thrown away after the eval"" is done | |
b5c19bd7 DM |
40 | executing). Require'd files are simply evals without any outer lexical |
41 | scope. | |
dd2155a4 DM |
42 | |
43 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, | |
44 | but that is really the callers pad (a slot of which is allocated by | |
45 | every entersub). | |
46 | ||
47 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items | |
f3548bdc | 48 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
dd2155a4 DM |
49 | The items in the AV are not SVs as for a normal AV, but other AVs: |
50 | ||
51 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather | |
52 | the "static type information" for lexicals. | |
53 | ||
54 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that | |
55 | depth of recursion into the CV. | |
56 | The 0'th slot of a frame AV is an AV which is @_. | |
57 | other entries are storage for variables and op targets. | |
58 | ||
59 | During compilation: | |
a6d05634 TM |
60 | C<PL_comppad_name> is set to the names AV. |
61 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. | |
62 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). | |
dd2155a4 | 63 | |
f3548bdc DM |
64 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
65 | frame of the currently executing sub. | |
66 | ||
67 | Iterating over the names AV iterates over all possible pad | |
dd2155a4 DM |
68 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
69 | &PL_sv_undef "names" (see pad_alloc()). | |
70 | ||
71 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. | |
72 | The rest are op targets/GVs/constants which are statically allocated | |
73 | or resolved at compile time. These don't have names by which they | |
74 | can be looked up from Perl code at run time through eval"" like | |
75 | my/our variables can be. Since they can't be looked up by "name" | |
76 | but only by their index allocated at compile time (which is usually | |
77 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. | |
78 | ||
79 | The SVs in the names AV have their PV being the name of the variable. | |
3441fb63 NC |
80 | xlow+1..xhigh inclusive in the NV union is a range of cop_seq numbers for |
81 | which the name is valid. For typed lexicals name SV is SVt_PVMG and SvSTASH | |
82 | points at the type. For C<our> lexicals, the type is also SVt_PVMG, with the | |
73d95100 | 83 | SvOURSTASH slot pointing at the stash of the associated global (so that |
931b58fb | 84 | duplicate C<our> declarations in the same package can be detected). SvUVX is |
3441fb63 | 85 | sometimes hijacked to store the generation number during compilation. |
dd2155a4 | 86 | |
b5c19bd7 DM |
87 | If SvFAKE is set on the name SV, then that slot in the frame AV is |
88 | a REFCNT'ed reference to a lexical from "outside". In this case, | |
3441fb63 NC |
89 | the name SV does not use xlow and xhigh to store a cop_seq range, since it is |
90 | in scope throughout. Instead xhigh stores some flags containing info about | |
b5c19bd7 | 91 | the real lexical (is it declared in an anon, and is it capable of being |
3441fb63 | 92 | instantiated multiple times?), and for fake ANONs, xlow contains the index |
b5c19bd7 DM |
93 | within the parent's pad where the lexical's value is stored, to make |
94 | cloning quicker. | |
dd2155a4 | 95 | |
a6d05634 | 96 | If the 'name' is '&' the corresponding entry in frame AV |
dd2155a4 DM |
97 | is a CV representing a possible closure. |
98 | (SvFAKE and name of '&' is not a meaningful combination currently but could | |
99 | become so if C<my sub foo {}> is implemented.) | |
100 | ||
71f882da DM |
101 | Note that formats are treated as anon subs, and are cloned each time |
102 | write is called (if necessary). | |
103 | ||
ab8e66c1 | 104 | The flag SVs_PADSTALE is cleared on lexicals each time the my() is executed, |
e6e7068b DM |
105 | and set on scope exit. This allows the 'Variable $x is not available' warning |
106 | to be generated in evals, such as | |
107 | ||
108 | { my $x = 1; sub f { eval '$x'} } f(); | |
109 | ||
ab8e66c1 | 110 | For state vars, SVs_PADSTALE is overloaded to mean 'not yet initialised' |
d1186544 | 111 | |
dd2155a4 DM |
112 | =cut |
113 | */ | |
114 | ||
115 | ||
116 | #include "EXTERN.h" | |
117 | #define PERL_IN_PAD_C | |
118 | #include "perl.h" | |
952306ac | 119 | #include "keywords.h" |
dd2155a4 | 120 | |
3441fb63 NC |
121 | #define COP_SEQ_RANGE_LOW_set(sv,val) \ |
122 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END | |
123 | #define COP_SEQ_RANGE_HIGH_set(sv,val) \ | |
124 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END | |
809abb02 | 125 | |
3441fb63 NC |
126 | #define PARENT_PAD_INDEX_set(sv,val) \ |
127 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END | |
128 | #define PARENT_FAKELEX_FLAGS_set(sv,val) \ | |
129 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END | |
dd2155a4 | 130 | |
c8185ac5 | 131 | #define PAD_MAX I32_MAX |
dd2155a4 | 132 | |
1dba731d NC |
133 | #ifdef PERL_MAD |
134 | void pad_peg(const char* s) { | |
790427a5 DM |
135 | static int pegcnt; /* XXX not threadsafe */ |
136 | PERL_UNUSED_ARG(s); | |
7918f24d NC |
137 | |
138 | PERL_ARGS_ASSERT_PAD_PEG; | |
139 | ||
1dba731d NC |
140 | pegcnt++; |
141 | } | |
142 | #endif | |
dd2155a4 DM |
143 | |
144 | /* | |
145 | =for apidoc pad_new | |
146 | ||
147 | Create a new compiling padlist, saving and updating the various global | |
148 | vars at the same time as creating the pad itself. The following flags | |
149 | can be OR'ed together: | |
150 | ||
151 | padnew_CLONE this pad is for a cloned CV | |
152 | padnew_SAVE save old globals | |
153 | padnew_SAVESUB also save extra stuff for start of sub | |
154 | ||
155 | =cut | |
156 | */ | |
157 | ||
158 | PADLIST * | |
c7c737cb | 159 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 | 160 | { |
97aff369 | 161 | dVAR; |
e1ec3a88 | 162 | AV *padlist, *padname, *pad; |
dd2155a4 | 163 | |
f3548bdc DM |
164 | ASSERT_CURPAD_LEGAL("pad_new"); |
165 | ||
dd2155a4 DM |
166 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
167 | * vars (based on flags) rather than storing vals + addresses for | |
168 | * each individually. Also see pad_block_start. | |
169 | * XXX DAPM Try to see whether all these conditionals are required | |
170 | */ | |
171 | ||
172 | /* save existing state, ... */ | |
173 | ||
174 | if (flags & padnew_SAVE) { | |
3979c56f | 175 | SAVECOMPPAD(); |
dd2155a4 DM |
176 | SAVESPTR(PL_comppad_name); |
177 | if (! (flags & padnew_CLONE)) { | |
178 | SAVEI32(PL_padix); | |
179 | SAVEI32(PL_comppad_name_fill); | |
180 | SAVEI32(PL_min_intro_pending); | |
181 | SAVEI32(PL_max_intro_pending); | |
8bbe96d7 | 182 | SAVEBOOL(PL_cv_has_eval); |
dd2155a4 | 183 | if (flags & padnew_SAVESUB) { |
f0cb02e3 | 184 | SAVEBOOL(PL_pad_reset_pending); |
dd2155a4 DM |
185 | } |
186 | } | |
187 | } | |
188 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
189 | * saved - check at some pt that this is okay */ | |
190 | ||
191 | /* ... create new pad ... */ | |
192 | ||
193 | padlist = newAV(); | |
194 | padname = newAV(); | |
195 | pad = newAV(); | |
196 | ||
197 | if (flags & padnew_CLONE) { | |
198 | /* XXX DAPM I dont know why cv_clone needs it | |
199 | * doing differently yet - perhaps this separate branch can be | |
200 | * dispensed with eventually ??? | |
201 | */ | |
202 | ||
e1ec3a88 | 203 | AV * const a0 = newAV(); /* will be @_ */ |
ad64d0ec | 204 | av_store(pad, 0, MUTABLE_SV(a0)); |
11ca45c0 | 205 | AvREIFY_only(a0); |
dd2155a4 DM |
206 | } |
207 | else { | |
a0714e2c | 208 | av_store(pad, 0, NULL); |
dd2155a4 DM |
209 | } |
210 | ||
211 | AvREAL_off(padlist); | |
ad64d0ec NC |
212 | av_store(padlist, 0, MUTABLE_SV(padname)); |
213 | av_store(padlist, 1, MUTABLE_SV(pad)); | |
dd2155a4 DM |
214 | |
215 | /* ... then update state variables */ | |
216 | ||
502c6561 NC |
217 | PL_comppad_name = MUTABLE_AV((*av_fetch(padlist, 0, FALSE))); |
218 | PL_comppad = MUTABLE_AV((*av_fetch(padlist, 1, FALSE))); | |
dd2155a4 DM |
219 | PL_curpad = AvARRAY(PL_comppad); |
220 | ||
221 | if (! (flags & padnew_CLONE)) { | |
222 | PL_comppad_name_fill = 0; | |
223 | PL_min_intro_pending = 0; | |
224 | PL_padix = 0; | |
b5c19bd7 | 225 | PL_cv_has_eval = 0; |
dd2155a4 DM |
226 | } |
227 | ||
228 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 229 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
dd2155a4 | 230 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
b5c19bd7 | 231 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
dd2155a4 DM |
232 | PTR2UV(padname), (UV)flags |
233 | ) | |
234 | ); | |
235 | ||
236 | return (PADLIST*)padlist; | |
237 | } | |
238 | ||
239 | /* | |
240 | =for apidoc pad_undef | |
241 | ||
242 | Free the padlist associated with a CV. | |
243 | If parts of it happen to be current, we null the relevant | |
244 | PL_*pad* global vars so that we don't have any dangling references left. | |
245 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
a3985cdc | 246 | inner subs to the outer of this cv. |
dd2155a4 | 247 | |
7dafbf52 DM |
248 | (This function should really be called pad_free, but the name was already |
249 | taken) | |
250 | ||
dd2155a4 DM |
251 | =cut |
252 | */ | |
253 | ||
254 | void | |
a3985cdc | 255 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 | 256 | { |
97aff369 | 257 | dVAR; |
dd2155a4 | 258 | I32 ix; |
b64e5050 | 259 | const PADLIST * const padlist = CvPADLIST(cv); |
dd2155a4 | 260 | |
7918f24d NC |
261 | PERL_ARGS_ASSERT_PAD_UNDEF; |
262 | ||
1dba731d | 263 | pad_peg("pad_undef"); |
dd2155a4 DM |
264 | if (!padlist) |
265 | return; | |
0565a181 | 266 | if (SvIS_FREED(padlist)) /* may be during global destruction */ |
dd2155a4 DM |
267 | return; |
268 | ||
269 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
503de470 DM |
270 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf" comppad=0x%"UVxf"\n", |
271 | PTR2UV(cv), PTR2UV(padlist), PTR2UV(PL_comppad)) | |
dd2155a4 DM |
272 | ); |
273 | ||
7dafbf52 DM |
274 | /* detach any '&' anon children in the pad; if afterwards they |
275 | * are still live, fix up their CvOUTSIDEs to point to our outside, | |
276 | * bypassing us. */ | |
277 | /* XXX DAPM for efficiency, we should only do this if we know we have | |
278 | * children, or integrate this loop with general cleanup */ | |
dd2155a4 | 279 | |
7dafbf52 | 280 | if (!PL_dirty) { /* don't bother during global destruction */ |
53c1dcc0 | 281 | CV * const outercv = CvOUTSIDE(cv); |
e1ec3a88 | 282 | const U32 seq = CvOUTSIDE_SEQ(cv); |
502c6561 | 283 | AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
53c1dcc0 | 284 | SV ** const namepad = AvARRAY(comppad_name); |
502c6561 | 285 | AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]); |
53c1dcc0 | 286 | SV ** const curpad = AvARRAY(comppad); |
dd2155a4 | 287 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
504618e9 | 288 | SV * const namesv = namepad[ix]; |
dd2155a4 | 289 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 290 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 291 | { |
ea726b52 | 292 | CV * const innercv = MUTABLE_CV(curpad[ix]); |
10dc53a8 DM |
293 | U32 inner_rc = SvREFCNT(innercv); |
294 | assert(inner_rc); | |
a0714e2c | 295 | namepad[ix] = NULL; |
7dafbf52 | 296 | SvREFCNT_dec(namesv); |
01773faa DM |
297 | |
298 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ | |
a0714e2c | 299 | curpad[ix] = NULL; |
01773faa | 300 | SvREFCNT_dec(innercv); |
10dc53a8 | 301 | inner_rc--; |
01773faa | 302 | } |
b37c2d43 AL |
303 | |
304 | /* in use, not just a prototype */ | |
305 | if (inner_rc && (CvOUTSIDE(innercv) == cv)) { | |
7dafbf52 | 306 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 JH |
307 | /* don't relink to grandfather if he's being freed */ |
308 | if (outercv && SvREFCNT(outercv)) { | |
309 | CvWEAKOUTSIDE_off(innercv); | |
310 | CvOUTSIDE(innercv) = outercv; | |
311 | CvOUTSIDE_SEQ(innercv) = seq; | |
f84c484e | 312 | SvREFCNT_inc_simple_void_NN(outercv); |
9d1ce744 JH |
313 | } |
314 | else { | |
601f1833 | 315 | CvOUTSIDE(innercv) = NULL; |
9d1ce744 | 316 | } |
dd2155a4 DM |
317 | } |
318 | } | |
319 | } | |
320 | } | |
7dafbf52 | 321 | |
dd2155a4 DM |
322 | ix = AvFILLp(padlist); |
323 | while (ix >= 0) { | |
5fe77bf8 | 324 | SV* const sv = AvARRAY(padlist)[ix--]; |
b37c2d43 | 325 | if (sv) { |
ad64d0ec | 326 | if (sv == (const SV *)PL_comppad_name) |
b37c2d43 | 327 | PL_comppad_name = NULL; |
ad64d0ec | 328 | else if (sv == (const SV *)PL_comppad) { |
b37c2d43 AL |
329 | PL_comppad = NULL; |
330 | PL_curpad = NULL; | |
331 | } | |
dd2155a4 DM |
332 | } |
333 | SvREFCNT_dec(sv); | |
334 | } | |
ad64d0ec | 335 | SvREFCNT_dec(MUTABLE_SV(CvPADLIST(cv))); |
4608196e | 336 | CvPADLIST(cv) = NULL; |
dd2155a4 DM |
337 | } |
338 | ||
339 | ||
340 | ||
341 | ||
3291825f NC |
342 | static PADOFFSET |
343 | S_pad_add_name_sv(pTHX_ SV *namesv, const U32 flags, HV *typestash, | |
344 | HV *ourstash) | |
345 | { | |
346 | dVAR; | |
347 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); | |
348 | ||
349 | PERL_ARGS_ASSERT_PAD_ADD_NAME_SV; | |
350 | ||
351 | ASSERT_CURPAD_ACTIVE("pad_add_name"); | |
352 | ||
353 | if (typestash) { | |
354 | assert(SvTYPE(namesv) == SVt_PVMG); | |
355 | SvPAD_TYPED_on(namesv); | |
356 | SvSTASH_set(namesv, MUTABLE_HV(SvREFCNT_inc_simple_NN(MUTABLE_SV(typestash)))); | |
357 | } | |
358 | if (ourstash) { | |
359 | SvPAD_OUR_on(namesv); | |
360 | SvOURSTASH_set(namesv, ourstash); | |
361 | SvREFCNT_inc_simple_void_NN(ourstash); | |
362 | } | |
59cfed7d | 363 | else if (flags & padadd_STATE) { |
3291825f NC |
364 | SvPAD_STATE_on(namesv); |
365 | } | |
366 | ||
367 | av_store(PL_comppad_name, offset, namesv); | |
368 | return offset; | |
369 | } | |
370 | ||
dd2155a4 DM |
371 | /* |
372 | =for apidoc pad_add_name | |
373 | ||
b5c19bd7 DM |
374 | Create a new name and associated PADMY SV in the current pad; return the |
375 | offset. | |
dd2155a4 DM |
376 | If C<typestash> is valid, the name is for a typed lexical; set the |
377 | name's stash to that value. | |
378 | If C<ourstash> is valid, it's an our lexical, set the name's | |
73d95100 | 379 | SvOURSTASH to that value |
dd2155a4 | 380 | |
dd2155a4 DM |
381 | If fake, it means we're cloning an existing entry |
382 | ||
383 | =cut | |
384 | */ | |
385 | ||
dd2155a4 | 386 | PADOFFSET |
cca43f78 NC |
387 | Perl_pad_add_name(pTHX_ const char *name, const STRLEN len, const U32 flags, |
388 | HV *typestash, HV *ourstash) | |
dd2155a4 | 389 | { |
97aff369 | 390 | dVAR; |
3291825f | 391 | PADOFFSET offset; |
cca43f78 | 392 | SV *namesv; |
dd2155a4 | 393 | |
7918f24d NC |
394 | PERL_ARGS_ASSERT_PAD_ADD_NAME; |
395 | ||
59cfed7d | 396 | if (flags & ~(padadd_OUR|padadd_STATE|padadd_NO_DUP_CHECK)) |
cca43f78 NC |
397 | Perl_croak(aTHX_ "panic: pad_add_name illegal flag bits 0x%" UVxf, |
398 | (UV)flags); | |
399 | ||
400 | namesv = newSV_type((ourstash || typestash) ? SVt_PVMG : SVt_PVNV); | |
401 | ||
402 | /* Until we're using the length for real, cross check that we're being told | |
403 | the truth. */ | |
404 | PERL_UNUSED_ARG(len); | |
405 | assert(strlen(name) == len); | |
406 | ||
dd2155a4 DM |
407 | sv_setpv(namesv, name); |
408 | ||
59cfed7d | 409 | if ((flags & padadd_NO_DUP_CHECK) == 0) { |
2d12d04f | 410 | /* check for duplicate declaration */ |
59cfed7d | 411 | pad_check_dup(namesv, flags & padadd_OUR, ourstash); |
2d12d04f NC |
412 | } |
413 | ||
3291825f NC |
414 | offset = pad_add_name_sv(namesv, flags, typestash, ourstash); |
415 | ||
416 | /* not yet introduced */ | |
417 | COP_SEQ_RANGE_LOW_set(namesv, PAD_MAX); /* min */ | |
418 | COP_SEQ_RANGE_HIGH_set(namesv, 0); /* max */ | |
419 | ||
420 | if (!PL_min_intro_pending) | |
421 | PL_min_intro_pending = offset; | |
422 | PL_max_intro_pending = offset; | |
423 | /* if it's not a simple scalar, replace with an AV or HV */ | |
c1bf42f3 NC |
424 | assert(SvTYPE(PL_curpad[offset]) == SVt_NULL); |
425 | assert(SvREFCNT(PL_curpad[offset]) == 1); | |
3291825f | 426 | if (*name == '@') |
c1bf42f3 | 427 | sv_upgrade(PL_curpad[offset], SVt_PVAV); |
3291825f | 428 | else if (*name == '%') |
c1bf42f3 NC |
429 | sv_upgrade(PL_curpad[offset], SVt_PVHV); |
430 | assert(SvPADMY(PL_curpad[offset])); | |
3291825f NC |
431 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
432 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", | |
433 | (long)offset, name, PTR2UV(PL_curpad[offset]))); | |
dd2155a4 DM |
434 | |
435 | return offset; | |
436 | } | |
437 | ||
438 | ||
439 | ||
440 | ||
441 | /* | |
442 | =for apidoc pad_alloc | |
443 | ||
444 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
445 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
cf525c36 | 446 | for a slot which has no name and no active value. |
dd2155a4 DM |
447 | |
448 | =cut | |
449 | */ | |
450 | ||
451 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
452 | * or at least rationalise ??? */ | |
6d640399 NC |
453 | /* And flag whether the incoming name is UTF8 or 8 bit? |
454 | Could do this either with the +ve/-ve hack of the HV code, or expanding | |
455 | the flag bits. Either way, this makes proper Unicode safe pad support. | |
6d640399 NC |
456 | NWC |
457 | */ | |
dd2155a4 DM |
458 | |
459 | PADOFFSET | |
460 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
461 | { | |
97aff369 | 462 | dVAR; |
dd2155a4 DM |
463 | SV *sv; |
464 | I32 retval; | |
465 | ||
6136c704 | 466 | PERL_UNUSED_ARG(optype); |
f3548bdc DM |
467 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
468 | ||
dd2155a4 DM |
469 | if (AvARRAY(PL_comppad) != PL_curpad) |
470 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
471 | if (PL_pad_reset_pending) | |
472 | pad_reset(); | |
473 | if (tmptype & SVs_PADMY) { | |
235cc2e3 | 474 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 DM |
475 | retval = AvFILLp(PL_comppad); |
476 | } | |
477 | else { | |
551405c4 | 478 | SV * const * const names = AvARRAY(PL_comppad_name); |
e1ec3a88 | 479 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
dd2155a4 DM |
480 | for (;;) { |
481 | /* | |
482 | * "foreach" index vars temporarily become aliases to non-"my" | |
483 | * values. Thus we must skip, not just pad values that are | |
484 | * marked as current pad values, but also those with names. | |
485 | */ | |
486 | /* HVDS why copy to sv here? we don't seem to use it */ | |
487 | if (++PL_padix <= names_fill && | |
488 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
489 | continue; | |
490 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
491 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
492 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
493 | break; | |
494 | } | |
495 | retval = PL_padix; | |
496 | } | |
497 | SvFLAGS(sv) |= tmptype; | |
498 | PL_curpad = AvARRAY(PL_comppad); | |
499 | ||
500 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
501 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
502 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
503 | PL_op_name[optype])); | |
fd0854ff DM |
504 | #ifdef DEBUG_LEAKING_SCALARS |
505 | sv->sv_debug_optype = optype; | |
506 | sv->sv_debug_inpad = 1; | |
fd0854ff | 507 | #endif |
a212c8b5 | 508 | return (PADOFFSET)retval; |
dd2155a4 DM |
509 | } |
510 | ||
511 | /* | |
512 | =for apidoc pad_add_anon | |
513 | ||
514 | Add an anon code entry to the current compiling pad | |
515 | ||
516 | =cut | |
517 | */ | |
518 | ||
519 | PADOFFSET | |
520 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
521 | { | |
97aff369 | 522 | dVAR; |
dd2155a4 | 523 | PADOFFSET ix; |
b9f83d2f | 524 | SV* const name = newSV_type(SVt_PVNV); |
7918f24d NC |
525 | |
526 | PERL_ARGS_ASSERT_PAD_ADD_ANON; | |
527 | ||
1dba731d | 528 | pad_peg("add_anon"); |
76f68e9b | 529 | sv_setpvs(name, "&"); |
809abb02 NC |
530 | /* Are these two actually ever read? */ |
531 | COP_SEQ_RANGE_HIGH_set(name, ~0); | |
532 | COP_SEQ_RANGE_LOW_set(name, 1); | |
dd2155a4 DM |
533 | ix = pad_alloc(op_type, SVs_PADMY); |
534 | av_store(PL_comppad_name, ix, name); | |
f3548bdc | 535 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 DM |
536 | av_store(PL_comppad, ix, sv); |
537 | SvPADMY_on(sv); | |
7dafbf52 DM |
538 | |
539 | /* to avoid ref loops, we never have parent + child referencing each | |
540 | * other simultaneously */ | |
ea726b52 NC |
541 | if (CvOUTSIDE((const CV *)sv)) { |
542 | assert(!CvWEAKOUTSIDE((const CV *)sv)); | |
543 | CvWEAKOUTSIDE_on(MUTABLE_CV(sv)); | |
544 | SvREFCNT_dec(CvOUTSIDE(MUTABLE_CV(sv))); | |
7dafbf52 | 545 | } |
dd2155a4 DM |
546 | return ix; |
547 | } | |
548 | ||
549 | ||
550 | ||
551 | /* | |
552 | =for apidoc pad_check_dup | |
553 | ||
554 | Check for duplicate declarations: report any of: | |
555 | * a my in the current scope with the same name; | |
556 | * an our (anywhere in the pad) with the same name and the same stash | |
557 | as C<ourstash> | |
558 | C<is_our> indicates that the name to check is an 'our' declaration | |
559 | ||
560 | =cut | |
561 | */ | |
562 | ||
20381b50 | 563 | STATIC void |
2d12d04f | 564 | S_pad_check_dup(pTHX_ SV *name, const U32 flags, const HV *ourstash) |
dd2155a4 | 565 | { |
97aff369 | 566 | dVAR; |
53c1dcc0 | 567 | SV **svp; |
dd2155a4 | 568 | PADOFFSET top, off; |
59cfed7d | 569 | const U32 is_our = flags & padadd_OUR; |
dd2155a4 | 570 | |
7918f24d NC |
571 | PERL_ARGS_ASSERT_PAD_CHECK_DUP; |
572 | ||
f3548bdc | 573 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
35f82371 | 574 | |
59cfed7d | 575 | assert((flags & ~padadd_OUR) == 0); |
35f82371 | 576 | |
041457d9 | 577 | if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) |
dd2155a4 DM |
578 | return; /* nothing to check */ |
579 | ||
580 | svp = AvARRAY(PL_comppad_name); | |
581 | top = AvFILLp(PL_comppad_name); | |
582 | /* check the current scope */ | |
583 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
584 | * type ? */ | |
585 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
53c1dcc0 AL |
586 | SV * const sv = svp[off]; |
587 | if (sv | |
dd2155a4 | 588 | && sv != &PL_sv_undef |
ee6cee0c | 589 | && !SvFAKE(sv) |
809abb02 | 590 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
2d12d04f | 591 | && sv_eq(name, sv)) |
dd2155a4 | 592 | { |
00b1698f | 593 | if (is_our && (SvPAD_OUR(sv))) |
7f73a9f1 | 594 | break; /* "our" masking "our" */ |
dd2155a4 | 595 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
c541b9b4 | 596 | "\"%s\" variable %"SVf" masks earlier declaration in same %s", |
12bd6ede | 597 | (is_our ? "our" : PL_parser->in_my == KEY_my ? "my" : "state"), |
c541b9b4 | 598 | sv, |
809abb02 | 599 | (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX ? "scope" : "statement")); |
dd2155a4 DM |
600 | --off; |
601 | break; | |
602 | } | |
603 | } | |
604 | /* check the rest of the pad */ | |
605 | if (is_our) { | |
606 | do { | |
53c1dcc0 AL |
607 | SV * const sv = svp[off]; |
608 | if (sv | |
dd2155a4 | 609 | && sv != &PL_sv_undef |
ee6cee0c | 610 | && !SvFAKE(sv) |
809abb02 | 611 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
73d95100 | 612 | && SvOURSTASH(sv) == ourstash |
2d12d04f | 613 | && sv_eq(name, sv)) |
dd2155a4 DM |
614 | { |
615 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
c541b9b4 | 616 | "\"our\" variable %"SVf" redeclared", sv); |
624f69f5 | 617 | if ((I32)off <= PL_comppad_name_floor) |
7f73a9f1 RGS |
618 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
619 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
dd2155a4 DM |
620 | break; |
621 | } | |
622 | } while ( off-- > 0 ); | |
623 | } | |
624 | } | |
625 | ||
626 | ||
dd2155a4 DM |
627 | /* |
628 | =for apidoc pad_findmy | |
629 | ||
630 | Given a lexical name, try to find its offset, first in the current pad, | |
631 | or failing that, in the pads of any lexically enclosing subs (including | |
632 | the complications introduced by eval). If the name is found in an outer pad, | |
633 | then a fake entry is added to the current pad. | |
634 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
635 | ||
636 | =cut | |
637 | */ | |
638 | ||
639 | PADOFFSET | |
f8f98e0a | 640 | Perl_pad_findmy(pTHX_ const char *name, STRLEN len, U32 flags) |
dd2155a4 | 641 | { |
97aff369 | 642 | dVAR; |
b5c19bd7 DM |
643 | SV *out_sv; |
644 | int out_flags; | |
929a0744 | 645 | I32 offset; |
e1ec3a88 | 646 | const AV *nameav; |
929a0744 | 647 | SV **name_svp; |
dd2155a4 | 648 | |
7918f24d NC |
649 | PERL_ARGS_ASSERT_PAD_FINDMY; |
650 | ||
1dba731d | 651 | pad_peg("pad_findmy"); |
f8f98e0a NC |
652 | |
653 | if (flags) | |
654 | Perl_croak(aTHX_ "panic: pad_findmy illegal flag bits 0x%" UVxf, | |
655 | (UV)flags); | |
656 | ||
657 | /* Yes, it is a bug (read work in progress) that we're not really using this | |
658 | length parameter, and instead relying on strlen() later on. But I'm not | |
659 | comfortable about changing the pad API piecemeal to use and rely on | |
660 | lengths. This only exists to avoid an "unused parameter" warning. */ | |
661 | if (len < 2) | |
662 | return NOT_IN_PAD; | |
663 | ||
664 | /* But until we're using the length for real, cross check that we're being | |
665 | told the truth. */ | |
666 | assert(strlen(name) == len); | |
667 | ||
9f7d9405 | 668 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
4608196e | 669 | NULL, &out_sv, &out_flags); |
9f7d9405 | 670 | if ((PADOFFSET)offset != NOT_IN_PAD) |
929a0744 DM |
671 | return offset; |
672 | ||
673 | /* look for an our that's being introduced; this allows | |
674 | * our $foo = 0 unless defined $foo; | |
675 | * to not give a warning. (Yes, this is a hack) */ | |
676 | ||
502c6561 | 677 | nameav = MUTABLE_AV(AvARRAY(CvPADLIST(PL_compcv))[0]); |
929a0744 DM |
678 | name_svp = AvARRAY(nameav); |
679 | for (offset = AvFILLp(nameav); offset > 0; offset--) { | |
551405c4 | 680 | const SV * const namesv = name_svp[offset]; |
929a0744 DM |
681 | if (namesv && namesv != &PL_sv_undef |
682 | && !SvFAKE(namesv) | |
00b1698f | 683 | && (SvPAD_OUR(namesv)) |
b15aece3 | 684 | && strEQ(SvPVX_const(namesv), name) |
809abb02 | 685 | && COP_SEQ_RANGE_LOW(namesv) == PAD_MAX /* min */ |
929a0744 DM |
686 | ) |
687 | return offset; | |
688 | } | |
689 | return NOT_IN_PAD; | |
dd2155a4 DM |
690 | } |
691 | ||
e1f795dc RGS |
692 | /* |
693 | * Returns the offset of a lexical $_, if there is one, at run time. | |
694 | * Used by the UNDERBAR XS macro. | |
695 | */ | |
696 | ||
697 | PADOFFSET | |
29289021 | 698 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc | 699 | { |
97aff369 | 700 | dVAR; |
e1f795dc RGS |
701 | SV *out_sv; |
702 | int out_flags; | |
703 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, | |
4608196e | 704 | NULL, &out_sv, &out_flags); |
e1f795dc | 705 | } |
dd2155a4 | 706 | |
dd2155a4 | 707 | /* |
789bd863 VP |
708 | * Returns a lexical $_, if there is one, at run time ; or the global one |
709 | * otherwise. | |
710 | */ | |
711 | ||
712 | SV * | |
713 | Perl_find_rundefsv(pTHX) | |
714 | { | |
715 | SV *namesv; | |
716 | int flags; | |
717 | PADOFFSET po; | |
718 | ||
719 | po = pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, | |
720 | NULL, &namesv, &flags); | |
721 | ||
722 | if (po == NOT_IN_PAD | |
723 | || (SvFLAGS(namesv) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR)) | |
724 | return DEFSV; | |
725 | ||
726 | return PAD_SVl(po); | |
727 | } | |
728 | ||
729 | /* | |
dd2155a4 DM |
730 | =for apidoc pad_findlex |
731 | ||
732 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
b5c19bd7 DM |
733 | in the inner pads if it's found in an outer one. |
734 | ||
735 | Returns the offset in the bottom pad of the lex or the fake lex. | |
736 | cv is the CV in which to start the search, and seq is the current cop_seq | |
737 | to match against. If warn is true, print appropriate warnings. The out_* | |
738 | vars return values, and so are pointers to where the returned values | |
739 | should be stored. out_capture, if non-null, requests that the innermost | |
740 | instance of the lexical is captured; out_name_sv is set to the innermost | |
741 | matched namesv or fake namesv; out_flags returns the flags normally | |
742 | associated with the IVX field of a fake namesv. | |
743 | ||
744 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, | |
745 | then comes back down, adding fake entries as it goes. It has to be this way | |
3441fb63 | 746 | because fake namesvs in anon protoypes have to store in xlow the index into |
b5c19bd7 | 747 | the parent pad. |
dd2155a4 DM |
748 | |
749 | =cut | |
750 | */ | |
751 | ||
b5c19bd7 DM |
752 | /* the CV has finished being compiled. This is not a sufficient test for |
753 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
754 | #define CvCOMPILED(cv) CvROOT(cv) | |
755 | ||
71f882da DM |
756 | /* the CV does late binding of its lexicals */ |
757 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) | |
758 | ||
b5c19bd7 | 759 | |
dd2155a4 | 760 | STATIC PADOFFSET |
e1ec3a88 | 761 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
b5c19bd7 | 762 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 | 763 | { |
97aff369 | 764 | dVAR; |
b5c19bd7 DM |
765 | I32 offset, new_offset; |
766 | SV *new_capture; | |
767 | SV **new_capturep; | |
b64e5050 | 768 | const AV * const padlist = CvPADLIST(cv); |
dd2155a4 | 769 | |
7918f24d NC |
770 | PERL_ARGS_ASSERT_PAD_FINDLEX; |
771 | ||
b5c19bd7 | 772 | *out_flags = 0; |
a3985cdc | 773 | |
b5c19bd7 DM |
774 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
775 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", | |
776 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); | |
dd2155a4 | 777 | |
b5c19bd7 | 778 | /* first, search this pad */ |
dd2155a4 | 779 | |
b5c19bd7 DM |
780 | if (padlist) { /* not an undef CV */ |
781 | I32 fake_offset = 0; | |
502c6561 | 782 | const AV * const nameav = MUTABLE_AV(AvARRAY(padlist)[0]); |
551405c4 | 783 | SV * const * const name_svp = AvARRAY(nameav); |
ee6cee0c | 784 | |
b5c19bd7 | 785 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
551405c4 | 786 | const SV * const namesv = name_svp[offset]; |
b5c19bd7 | 787 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 788 | && strEQ(SvPVX_const(namesv), name)) |
b5c19bd7 DM |
789 | { |
790 | if (SvFAKE(namesv)) | |
791 | fake_offset = offset; /* in case we don't find a real one */ | |
809abb02 NC |
792 | else if ( seq > COP_SEQ_RANGE_LOW(namesv) /* min */ |
793 | && seq <= COP_SEQ_RANGE_HIGH(namesv)) /* max */ | |
b5c19bd7 | 794 | break; |
ee6cee0c DM |
795 | } |
796 | } | |
797 | ||
b5c19bd7 DM |
798 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
799 | if (offset > 0) { /* not fake */ | |
800 | fake_offset = 0; | |
801 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
802 | ||
803 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
804 | * instances. For now, we just test !CvUNIQUE(cv), but | |
805 | * ideally, we should detect my's declared within loops | |
806 | * etc - this would allow a wider range of 'not stayed | |
807 | * shared' warnings. We also treated alreadly-compiled | |
808 | * lexes as not multi as viewed from evals. */ | |
809 | ||
810 | *out_flags = CvANON(cv) ? | |
811 | PAD_FAKELEX_ANON : | |
812 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
813 | ? PAD_FAKELEX_MULTI : 0; | |
814 | ||
815 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
809abb02 NC |
816 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%lu,%lu)\n", |
817 | PTR2UV(cv), (long)offset, | |
818 | (unsigned long)COP_SEQ_RANGE_LOW(*out_name_sv), | |
819 | (unsigned long)COP_SEQ_RANGE_HIGH(*out_name_sv))); | |
b5c19bd7 DM |
820 | } |
821 | else { /* fake match */ | |
822 | offset = fake_offset; | |
823 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
809abb02 | 824 | *out_flags = PARENT_FAKELEX_FLAGS(*out_name_sv); |
b5c19bd7 | 825 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
19a5c512 | 826 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 | 827 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
809abb02 | 828 | (unsigned long) PARENT_PAD_INDEX(*out_name_sv) |
b5c19bd7 DM |
829 | )); |
830 | } | |
dd2155a4 | 831 | |
b5c19bd7 | 832 | /* return the lex? */ |
dd2155a4 | 833 | |
b5c19bd7 | 834 | if (out_capture) { |
dd2155a4 | 835 | |
b5c19bd7 | 836 | /* our ? */ |
00b1698f | 837 | if (SvPAD_OUR(*out_name_sv)) { |
a0714e2c | 838 | *out_capture = NULL; |
b5c19bd7 DM |
839 | return offset; |
840 | } | |
ee6cee0c | 841 | |
b5c19bd7 DM |
842 | /* trying to capture from an anon prototype? */ |
843 | if (CvCOMPILED(cv) | |
844 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
845 | : *out_flags & PAD_FAKELEX_ANON) | |
846 | { | |
a2a5de95 NC |
847 | if (warn) |
848 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), | |
849 | "Variable \"%s\" is not available", name); | |
a0714e2c | 850 | *out_capture = NULL; |
b5c19bd7 | 851 | } |
ee6cee0c | 852 | |
b5c19bd7 DM |
853 | /* real value */ |
854 | else { | |
855 | int newwarn = warn; | |
856 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
d1186544 | 857 | && !SvPAD_STATE(name_svp[offset]) |
b5c19bd7 DM |
858 | && warn && ckWARN(WARN_CLOSURE)) { |
859 | newwarn = 0; | |
860 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
861 | "Variable \"%s\" will not stay shared", name); | |
862 | } | |
dd2155a4 | 863 | |
b5c19bd7 DM |
864 | if (fake_offset && CvANON(cv) |
865 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
866 | { | |
867 | SV *n; | |
868 | /* not yet caught - look further up */ | |
869 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
870 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", | |
871 | PTR2UV(cv))); | |
872 | n = *out_name_sv; | |
282e1742 DM |
873 | (void) pad_findlex(name, CvOUTSIDE(cv), |
874 | CvOUTSIDE_SEQ(cv), | |
b5c19bd7 DM |
875 | newwarn, out_capture, out_name_sv, out_flags); |
876 | *out_name_sv = n; | |
877 | return offset; | |
dd2155a4 | 878 | } |
b5c19bd7 | 879 | |
502c6561 NC |
880 | *out_capture = AvARRAY(MUTABLE_AV(AvARRAY(padlist)[ |
881 | CvDEPTH(cv) ? CvDEPTH(cv) : 1]))[offset]; | |
b5c19bd7 DM |
882 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
883 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", | |
19a5c512 | 884 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 | 885 | |
d1186544 DM |
886 | if (SvPADSTALE(*out_capture) |
887 | && !SvPAD_STATE(name_svp[offset])) | |
888 | { | |
a2a5de95 NC |
889 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
890 | "Variable \"%s\" is not available", name); | |
a0714e2c | 891 | *out_capture = NULL; |
dd2155a4 DM |
892 | } |
893 | } | |
b5c19bd7 DM |
894 | if (!*out_capture) { |
895 | if (*name == '@') | |
ad64d0ec | 896 | *out_capture = sv_2mortal(MUTABLE_SV(newAV())); |
b5c19bd7 | 897 | else if (*name == '%') |
ad64d0ec | 898 | *out_capture = sv_2mortal(MUTABLE_SV(newHV())); |
b5c19bd7 DM |
899 | else |
900 | *out_capture = sv_newmortal(); | |
901 | } | |
dd2155a4 | 902 | } |
b5c19bd7 DM |
903 | |
904 | return offset; | |
ee6cee0c | 905 | } |
b5c19bd7 DM |
906 | } |
907 | ||
908 | /* it's not in this pad - try above */ | |
909 | ||
910 | if (!CvOUTSIDE(cv)) | |
911 | return NOT_IN_PAD; | |
9f7d9405 | 912 | |
b5c19bd7 | 913 | /* out_capture non-null means caller wants us to capture lex; in |
71f882da | 914 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 915 | new_capturep = out_capture ? out_capture : |
4608196e | 916 | CvLATE(cv) ? NULL : &new_capture; |
b5c19bd7 DM |
917 | |
918 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
919 | new_capturep, out_name_sv, out_flags); | |
9f7d9405 | 920 | if ((PADOFFSET)offset == NOT_IN_PAD) |
b5c19bd7 | 921 | return NOT_IN_PAD; |
9f7d9405 | 922 | |
b5c19bd7 DM |
923 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
924 | ||
925 | /* don't add new fake entries (via eval) to CVs that we have already | |
926 | * finished compiling, or to undef CVs */ | |
927 | if (CvCOMPILED(cv) || !padlist) | |
928 | return 0; /* this dummy (and invalid) value isnt used by the caller */ | |
929 | ||
930 | { | |
3291825f NC |
931 | /* This relies on sv_setsv_flags() upgrading the destination to the same |
932 | type as the source, independant of the flags set, and on it being | |
933 | "good" and only copying flag bits and pointers that it understands. | |
934 | */ | |
935 | SV *new_namesv = newSVsv(*out_name_sv); | |
53c1dcc0 AL |
936 | AV * const ocomppad_name = PL_comppad_name; |
937 | PAD * const ocomppad = PL_comppad; | |
502c6561 NC |
938 | PL_comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
939 | PL_comppad = MUTABLE_AV(AvARRAY(padlist)[1]); | |
b5c19bd7 DM |
940 | PL_curpad = AvARRAY(PL_comppad); |
941 | ||
3291825f NC |
942 | new_offset |
943 | = pad_add_name_sv(new_namesv, | |
59cfed7d | 944 | (SvPAD_STATE(*out_name_sv) ? padadd_STATE : 0), |
3291825f NC |
945 | SvPAD_TYPED(*out_name_sv) |
946 | ? SvSTASH(*out_name_sv) : NULL, | |
947 | SvOURSTASH(*out_name_sv) | |
948 | ); | |
949 | ||
950 | SvFAKE_on(new_namesv); | |
951 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
952 | "Pad addname: %ld \"%.*s\" FAKE\n", | |
953 | (long)new_offset, | |
954 | (int) SvCUR(new_namesv), SvPVX(new_namesv))); | |
809abb02 | 955 | PARENT_FAKELEX_FLAGS_set(new_namesv, *out_flags); |
b5c19bd7 | 956 | |
809abb02 | 957 | PARENT_PAD_INDEX_set(new_namesv, 0); |
00b1698f | 958 | if (SvPAD_OUR(new_namesv)) { |
6f207bd3 | 959 | NOOP; /* do nothing */ |
b5c19bd7 | 960 | } |
71f882da | 961 | else if (CvLATE(cv)) { |
b5c19bd7 | 962 | /* delayed creation - just note the offset within parent pad */ |
809abb02 | 963 | PARENT_PAD_INDEX_set(new_namesv, offset); |
b5c19bd7 DM |
964 | CvCLONE_on(cv); |
965 | } | |
966 | else { | |
967 | /* immediate creation - capture outer value right now */ | |
968 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
969 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
970 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", | |
971 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
dd2155a4 | 972 | } |
b5c19bd7 | 973 | *out_name_sv = new_namesv; |
809abb02 | 974 | *out_flags = PARENT_FAKELEX_FLAGS(new_namesv); |
b5c19bd7 DM |
975 | |
976 | PL_comppad_name = ocomppad_name; | |
977 | PL_comppad = ocomppad; | |
4608196e | 978 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL; |
dd2155a4 | 979 | } |
b5c19bd7 | 980 | return new_offset; |
dd2155a4 DM |
981 | } |
982 | ||
fb8a9836 AL |
983 | |
984 | #ifdef DEBUGGING | |
dd2155a4 DM |
985 | /* |
986 | =for apidoc pad_sv | |
987 | ||
988 | Get the value at offset po in the current pad. | |
989 | Use macro PAD_SV instead of calling this function directly. | |
990 | ||
991 | =cut | |
992 | */ | |
993 | ||
994 | ||
995 | SV * | |
996 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
997 | { | |
97aff369 | 998 | dVAR; |
f3548bdc | 999 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 1000 | |
dd2155a4 DM |
1001 | if (!po) |
1002 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
1003 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1004 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 1005 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
1006 | ); |
1007 | return PL_curpad[po]; | |
1008 | } | |
1009 | ||
1010 | ||
1011 | /* | |
1012 | =for apidoc pad_setsv | |
1013 | ||
1014 | Set the entry at offset po in the current pad to sv. | |
1015 | Use the macro PAD_SETSV() rather than calling this function directly. | |
1016 | ||
1017 | =cut | |
1018 | */ | |
1019 | ||
dd2155a4 DM |
1020 | void |
1021 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
1022 | { | |
97aff369 | 1023 | dVAR; |
7918f24d NC |
1024 | |
1025 | PERL_ARGS_ASSERT_PAD_SETSV; | |
1026 | ||
f3548bdc | 1027 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
1028 | |
1029 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1030 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 1031 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
1032 | ); |
1033 | PL_curpad[po] = sv; | |
1034 | } | |
1035 | #endif | |
1036 | ||
1037 | ||
1038 | ||
1039 | /* | |
1040 | =for apidoc pad_block_start | |
1041 | ||
1042 | Update the pad compilation state variables on entry to a new block | |
1043 | ||
1044 | =cut | |
1045 | */ | |
1046 | ||
1047 | /* XXX DAPM perhaps: | |
1048 | * - integrate this in general state-saving routine ??? | |
1049 | * - combine with the state-saving going on in pad_new ??? | |
1050 | * - introduce a new SAVE type that does all this in one go ? | |
1051 | */ | |
1052 | ||
1053 | void | |
1054 | Perl_pad_block_start(pTHX_ int full) | |
1055 | { | |
97aff369 | 1056 | dVAR; |
f3548bdc | 1057 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
1058 | SAVEI32(PL_comppad_name_floor); |
1059 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
1060 | if (full) | |
1061 | PL_comppad_name_fill = PL_comppad_name_floor; | |
1062 | if (PL_comppad_name_floor < 0) | |
1063 | PL_comppad_name_floor = 0; | |
1064 | SAVEI32(PL_min_intro_pending); | |
1065 | SAVEI32(PL_max_intro_pending); | |
1066 | PL_min_intro_pending = 0; | |
1067 | SAVEI32(PL_comppad_name_fill); | |
1068 | SAVEI32(PL_padix_floor); | |
1069 | PL_padix_floor = PL_padix; | |
1070 | PL_pad_reset_pending = FALSE; | |
1071 | } | |
1072 | ||
1073 | ||
1074 | /* | |
1075 | =for apidoc intro_my | |
1076 | ||
1077 | "Introduce" my variables to visible status. | |
1078 | ||
1079 | =cut | |
1080 | */ | |
1081 | ||
1082 | U32 | |
1083 | Perl_intro_my(pTHX) | |
1084 | { | |
97aff369 | 1085 | dVAR; |
dd2155a4 | 1086 | SV **svp; |
dd2155a4 DM |
1087 | I32 i; |
1088 | ||
f3548bdc | 1089 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
1090 | if (! PL_min_intro_pending) |
1091 | return PL_cop_seqmax; | |
1092 | ||
1093 | svp = AvARRAY(PL_comppad_name); | |
1094 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
53c1dcc0 AL |
1095 | SV * const sv = svp[i]; |
1096 | ||
809abb02 NC |
1097 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !COP_SEQ_RANGE_HIGH(sv)) { |
1098 | COP_SEQ_RANGE_HIGH_set(sv, PAD_MAX); /* Don't know scope end yet. */ | |
1099 | COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax); | |
dd2155a4 | 1100 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
809abb02 | 1101 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
b15aece3 | 1102 | (long)i, SvPVX_const(sv), |
809abb02 NC |
1103 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
1104 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
dd2155a4 DM |
1105 | ); |
1106 | } | |
1107 | } | |
1108 | PL_min_intro_pending = 0; | |
1109 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
1110 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1111 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
1112 | ||
1113 | return PL_cop_seqmax++; | |
1114 | } | |
1115 | ||
1116 | /* | |
1117 | =for apidoc pad_leavemy | |
1118 | ||
1119 | Cleanup at end of scope during compilation: set the max seq number for | |
1120 | lexicals in this scope and warn of any lexicals that never got introduced. | |
1121 | ||
1122 | =cut | |
1123 | */ | |
1124 | ||
1125 | void | |
1126 | Perl_pad_leavemy(pTHX) | |
1127 | { | |
97aff369 | 1128 | dVAR; |
dd2155a4 | 1129 | I32 off; |
551405c4 | 1130 | SV * const * const svp = AvARRAY(PL_comppad_name); |
dd2155a4 DM |
1131 | |
1132 | PL_pad_reset_pending = FALSE; | |
1133 | ||
f3548bdc | 1134 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
1135 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
1136 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
53c1dcc0 | 1137 | const SV * const sv = svp[off]; |
9b387841 NC |
1138 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv)) |
1139 | Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), | |
1140 | "%"SVf" never introduced", | |
1141 | SVfARG(sv)); | |
dd2155a4 DM |
1142 | } |
1143 | } | |
1144 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
1145 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
53c1dcc0 | 1146 | const SV * const sv = svp[off]; |
809abb02 NC |
1147 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && COP_SEQ_RANGE_HIGH(sv) == PAD_MAX) { |
1148 | COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax); | |
dd2155a4 | 1149 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
809abb02 | 1150 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
b15aece3 | 1151 | (long)off, SvPVX_const(sv), |
809abb02 NC |
1152 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
1153 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
dd2155a4 DM |
1154 | ); |
1155 | } | |
1156 | } | |
1157 | PL_cop_seqmax++; | |
1158 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1159 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1160 | } | |
1161 | ||
1162 | ||
1163 | /* | |
1164 | =for apidoc pad_swipe | |
1165 | ||
1166 | Abandon the tmp in the current pad at offset po and replace with a | |
1167 | new one. | |
1168 | ||
1169 | =cut | |
1170 | */ | |
1171 | ||
1172 | void | |
1173 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1174 | { | |
97aff369 | 1175 | dVAR; |
f3548bdc | 1176 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
1177 | if (!PL_curpad) |
1178 | return; | |
1179 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1180 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1181 | if (!po) | |
1182 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1183 | ||
1184 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1185 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1186 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1187 | ||
1188 | if (PL_curpad[po]) | |
1189 | SvPADTMP_off(PL_curpad[po]); | |
1190 | if (refadjust) | |
1191 | SvREFCNT_dec(PL_curpad[po]); | |
1192 | ||
9ad9869c DM |
1193 | |
1194 | /* if pad tmps aren't shared between ops, then there's no need to | |
1195 | * create a new tmp when an existing op is freed */ | |
1196 | #ifdef USE_BROKEN_PAD_RESET | |
561b68a9 | 1197 | PL_curpad[po] = newSV(0); |
dd2155a4 | 1198 | SvPADTMP_on(PL_curpad[po]); |
9ad9869c DM |
1199 | #else |
1200 | PL_curpad[po] = &PL_sv_undef; | |
97bf4a8d | 1201 | #endif |
dd2155a4 DM |
1202 | if ((I32)po < PL_padix) |
1203 | PL_padix = po - 1; | |
1204 | } | |
1205 | ||
1206 | ||
1207 | /* | |
1208 | =for apidoc pad_reset | |
1209 | ||
1210 | Mark all the current temporaries for reuse | |
1211 | ||
1212 | =cut | |
1213 | */ | |
1214 | ||
1215 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1216 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1217 | * on the stack by OPs that use them, there are several ways to get an alias | |
1218 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1219 | * We avoid doing this until we can think of a Better Way. | |
1220 | * GSAR 97-10-29 */ | |
1f676739 | 1221 | static void |
82af08ae | 1222 | S_pad_reset(pTHX) |
dd2155a4 | 1223 | { |
97aff369 | 1224 | dVAR; |
dd2155a4 | 1225 | #ifdef USE_BROKEN_PAD_RESET |
dd2155a4 DM |
1226 | if (AvARRAY(PL_comppad) != PL_curpad) |
1227 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1228 | ||
1229 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1230 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1231 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1232 | (long)PL_padix, (long)PL_padix_floor | |
1233 | ) | |
1234 | ); | |
1235 | ||
1236 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
e1ec3a88 | 1237 | register I32 po; |
dd2155a4 DM |
1238 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1239 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1240 | SvPADTMP_off(PL_curpad[po]); | |
1241 | } | |
1242 | PL_padix = PL_padix_floor; | |
1243 | } | |
1244 | #endif | |
1245 | PL_pad_reset_pending = FALSE; | |
1246 | } | |
1247 | ||
1248 | ||
1249 | /* | |
1250 | =for apidoc pad_tidy | |
1251 | ||
1252 | Tidy up a pad after we've finished compiling it: | |
1253 | * remove most stuff from the pads of anonsub prototypes; | |
1254 | * give it a @_; | |
1255 | * mark tmps as such. | |
1256 | ||
1257 | =cut | |
1258 | */ | |
1259 | ||
1260 | /* XXX DAPM surely most of this stuff should be done properly | |
1261 | * at the right time beforehand, rather than going around afterwards | |
1262 | * cleaning up our mistakes ??? | |
1263 | */ | |
1264 | ||
1265 | void | |
1266 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1267 | { | |
27da23d5 | 1268 | dVAR; |
dd2155a4 | 1269 | |
f3548bdc | 1270 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 DM |
1271 | |
1272 | /* If this CV has had any 'eval-capable' ops planted in it | |
1273 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any | |
1274 | * anon prototypes in the chain of CVs should be marked as cloneable, | |
1275 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets | |
1276 | * the right CvOUTSIDE. | |
1277 | * If running with -d, *any* sub may potentially have an eval | |
1278 | * excuted within it. | |
1279 | */ | |
1280 | ||
1281 | if (PL_cv_has_eval || PL_perldb) { | |
e1ec3a88 | 1282 | const CV *cv; |
b5c19bd7 DM |
1283 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1284 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1285 | break; /* no need to mark already-compiled code */ | |
1286 | if (CvANON(cv)) { | |
1287 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1288 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); | |
1289 | CvCLONE_on(cv); | |
1290 | } | |
1291 | } | |
1292 | } | |
1293 | ||
dd2155a4 DM |
1294 | /* extend curpad to match namepad */ |
1295 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
a0714e2c | 1296 | av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
dd2155a4 DM |
1297 | |
1298 | if (type == padtidy_SUBCLONE) { | |
551405c4 | 1299 | SV * const * const namep = AvARRAY(PL_comppad_name); |
504618e9 | 1300 | PADOFFSET ix; |
b5c19bd7 | 1301 | |
dd2155a4 DM |
1302 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1303 | SV *namesv; | |
1304 | ||
1305 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1306 | continue; | |
1307 | /* | |
1308 | * The only things that a clonable function needs in its | |
b5c19bd7 | 1309 | * pad are anonymous subs. |
dd2155a4 DM |
1310 | * The rest are created anew during cloning. |
1311 | */ | |
a0714e2c | 1312 | if (!((namesv = namep[ix]) != NULL && |
dd2155a4 | 1313 | namesv != &PL_sv_undef && |
b15aece3 | 1314 | *SvPVX_const(namesv) == '&')) |
dd2155a4 DM |
1315 | { |
1316 | SvREFCNT_dec(PL_curpad[ix]); | |
a0714e2c | 1317 | PL_curpad[ix] = NULL; |
dd2155a4 DM |
1318 | } |
1319 | } | |
1320 | } | |
1321 | else if (type == padtidy_SUB) { | |
1322 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
53c1dcc0 | 1323 | AV * const av = newAV(); /* Will be @_ */ |
ad64d0ec | 1324 | av_store(PL_comppad, 0, MUTABLE_SV(av)); |
11ca45c0 | 1325 | AvREIFY_only(av); |
dd2155a4 DM |
1326 | } |
1327 | ||
4cee4ca8 | 1328 | if (type == padtidy_SUB || type == padtidy_FORMAT) { |
adf8f095 | 1329 | SV * const * const namep = AvARRAY(PL_comppad_name); |
504618e9 | 1330 | PADOFFSET ix; |
dd2155a4 DM |
1331 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1332 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1333 | continue; | |
adf8f095 | 1334 | if (!SvPADMY(PL_curpad[ix])) { |
dd2155a4 | 1335 | SvPADTMP_on(PL_curpad[ix]); |
adf8f095 NC |
1336 | } else if (!SvFAKE(namep[ix])) { |
1337 | /* This is a work around for how the current implementation of | |
1338 | ?{ } blocks in regexps interacts with lexicals. | |
1339 | ||
1340 | One of our lexicals. | |
1341 | Can't do this on all lexicals, otherwise sub baz() won't | |
1342 | compile in | |
1343 | ||
1344 | my $foo; | |
1345 | ||
1346 | sub bar { ++$foo; } | |
1347 | ||
1348 | sub baz { ++$foo; } | |
1349 | ||
1350 | because completion of compiling &bar calling pad_tidy() | |
1351 | would cause (top level) $foo to be marked as stale, and | |
1352 | "no longer available". */ | |
1353 | SvPADSTALE_on(PL_curpad[ix]); | |
1354 | } | |
dd2155a4 DM |
1355 | } |
1356 | } | |
f3548bdc | 1357 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1358 | } |
1359 | ||
1360 | ||
1361 | /* | |
1362 | =for apidoc pad_free | |
1363 | ||
8627550a | 1364 | Free the SV at offset po in the current pad. |
dd2155a4 DM |
1365 | |
1366 | =cut | |
1367 | */ | |
1368 | ||
1369 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1370 | void | |
1371 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1372 | { | |
97aff369 | 1373 | dVAR; |
f3548bdc | 1374 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1375 | if (!PL_curpad) |
1376 | return; | |
1377 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1378 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1379 | if (!po) | |
1380 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1381 | ||
1382 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1383 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1384 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1385 | ); | |
1386 | ||
1387 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1388 | SvPADTMP_off(PL_curpad[po]); | |
1389 | #ifdef USE_ITHREADS | |
7e736055 | 1390 | /* SV could be a shared hash key (eg bugid #19022) */ |
ddea3ea7 | 1391 | if (!SvIsCOW(PL_curpad[po])) |
dd2155a4 | 1392 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1393 | #endif |
1394 | } | |
1395 | if ((I32)po < PL_padix) | |
1396 | PL_padix = po - 1; | |
1397 | } | |
1398 | ||
1399 | ||
1400 | ||
1401 | /* | |
1402 | =for apidoc do_dump_pad | |
1403 | ||
1404 | Dump the contents of a padlist | |
1405 | ||
1406 | =cut | |
1407 | */ | |
1408 | ||
1409 | void | |
1410 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1411 | { | |
97aff369 | 1412 | dVAR; |
e1ec3a88 AL |
1413 | const AV *pad_name; |
1414 | const AV *pad; | |
dd2155a4 DM |
1415 | SV **pname; |
1416 | SV **ppad; | |
dd2155a4 DM |
1417 | I32 ix; |
1418 | ||
7918f24d NC |
1419 | PERL_ARGS_ASSERT_DO_DUMP_PAD; |
1420 | ||
dd2155a4 DM |
1421 | if (!padlist) { |
1422 | return; | |
1423 | } | |
502c6561 NC |
1424 | pad_name = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 0, FALSE)); |
1425 | pad = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 1, FALSE)); | |
dd2155a4 DM |
1426 | pname = AvARRAY(pad_name); |
1427 | ppad = AvARRAY(pad); | |
1428 | Perl_dump_indent(aTHX_ level, file, | |
1429 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1430 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1431 | ); | |
1432 | ||
1433 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
e1ec3a88 | 1434 | const SV *namesv = pname[ix]; |
dd2155a4 | 1435 | if (namesv && namesv == &PL_sv_undef) { |
a0714e2c | 1436 | namesv = NULL; |
dd2155a4 DM |
1437 | } |
1438 | if (namesv) { | |
ee6cee0c DM |
1439 | if (SvFAKE(namesv)) |
1440 | Perl_dump_indent(aTHX_ level+1, file, | |
c0fd1b42 | 1441 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c DM |
1442 | (int) ix, |
1443 | PTR2UV(ppad[ix]), | |
1444 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
b15aece3 | 1445 | SvPVX_const(namesv), |
809abb02 NC |
1446 | (unsigned long)PARENT_FAKELEX_FLAGS(namesv), |
1447 | (unsigned long)PARENT_PAD_INDEX(namesv) | |
b5c19bd7 | 1448 | |
ee6cee0c DM |
1449 | ); |
1450 | else | |
1451 | Perl_dump_indent(aTHX_ level+1, file, | |
809abb02 | 1452 | "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n", |
ee6cee0c DM |
1453 | (int) ix, |
1454 | PTR2UV(ppad[ix]), | |
1455 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
809abb02 NC |
1456 | (unsigned long)COP_SEQ_RANGE_LOW(namesv), |
1457 | (unsigned long)COP_SEQ_RANGE_HIGH(namesv), | |
b15aece3 | 1458 | SvPVX_const(namesv) |
ee6cee0c | 1459 | ); |
dd2155a4 DM |
1460 | } |
1461 | else if (full) { | |
1462 | Perl_dump_indent(aTHX_ level+1, file, | |
1463 | "%2d. 0x%"UVxf"<%lu>\n", | |
1464 | (int) ix, | |
1465 | PTR2UV(ppad[ix]), | |
1466 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1467 | ); | |
1468 | } | |
1469 | } | |
1470 | } | |
1471 | ||
1472 | ||
1473 | ||
1474 | /* | |
1475 | =for apidoc cv_dump | |
1476 | ||
1477 | dump the contents of a CV | |
1478 | ||
1479 | =cut | |
1480 | */ | |
1481 | ||
1482 | #ifdef DEBUGGING | |
1483 | STATIC void | |
e1ec3a88 | 1484 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 | 1485 | { |
97aff369 | 1486 | dVAR; |
53c1dcc0 AL |
1487 | const CV * const outside = CvOUTSIDE(cv); |
1488 | AV* const padlist = CvPADLIST(cv); | |
dd2155a4 | 1489 | |
7918f24d NC |
1490 | PERL_ARGS_ASSERT_CV_DUMP; |
1491 | ||
dd2155a4 DM |
1492 | PerlIO_printf(Perl_debug_log, |
1493 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1494 | title, | |
1495 | PTR2UV(cv), | |
1496 | (CvANON(cv) ? "ANON" | |
71f882da | 1497 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 DM |
1498 | : (cv == PL_main_cv) ? "MAIN" |
1499 | : CvUNIQUE(cv) ? "UNIQUE" | |
1500 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1501 | PTR2UV(outside), | |
1502 | (!outside ? "null" | |
1503 | : CvANON(outside) ? "ANON" | |
1504 | : (outside == PL_main_cv) ? "MAIN" | |
1505 | : CvUNIQUE(outside) ? "UNIQUE" | |
1506 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1507 | ||
1508 | PerlIO_printf(Perl_debug_log, | |
1509 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1510 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1511 | } | |
1512 | #endif /* DEBUGGING */ | |
1513 | ||
1514 | ||
1515 | ||
1516 | ||
1517 | ||
1518 | /* | |
1519 | =for apidoc cv_clone | |
1520 | ||
1521 | Clone a CV: make a new CV which points to the same code etc, but which | |
1522 | has a newly-created pad built by copying the prototype pad and capturing | |
1523 | any outer lexicals. | |
1524 | ||
1525 | =cut | |
1526 | */ | |
1527 | ||
1528 | CV * | |
1529 | Perl_cv_clone(pTHX_ CV *proto) | |
1530 | { | |
27da23d5 | 1531 | dVAR; |
dd2155a4 | 1532 | I32 ix; |
53c1dcc0 | 1533 | AV* const protopadlist = CvPADLIST(proto); |
502c6561 NC |
1534 | const AV *const protopad_name = (const AV *)*av_fetch(protopadlist, 0, FALSE); |
1535 | const AV *const protopad = (const AV *)*av_fetch(protopadlist, 1, FALSE); | |
53c1dcc0 AL |
1536 | SV** const pname = AvARRAY(protopad_name); |
1537 | SV** const ppad = AvARRAY(protopad); | |
e1ec3a88 AL |
1538 | const I32 fname = AvFILLp(protopad_name); |
1539 | const I32 fpad = AvFILLp(protopad); | |
dd2155a4 | 1540 | CV* cv; |
b5c19bd7 DM |
1541 | SV** outpad; |
1542 | CV* outside; | |
71f882da | 1543 | long depth; |
dd2155a4 | 1544 | |
7918f24d NC |
1545 | PERL_ARGS_ASSERT_CV_CLONE; |
1546 | ||
dd2155a4 DM |
1547 | assert(!CvUNIQUE(proto)); |
1548 | ||
71f882da DM |
1549 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1550 | * to a prototype; we instead want the cloned parent who called us. | |
1551 | * Note that in general for formats, CvOUTSIDE != find_runcv */ | |
1552 | ||
1553 | outside = CvOUTSIDE(proto); | |
1554 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) | |
1555 | outside = find_runcv(NULL); | |
1556 | depth = CvDEPTH(outside); | |
1557 | assert(depth || SvTYPE(proto) == SVt_PVFM); | |
1558 | if (!depth) | |
1559 | depth = 1; | |
b5c19bd7 DM |
1560 | assert(CvPADLIST(outside)); |
1561 | ||
dd2155a4 DM |
1562 | ENTER; |
1563 | SAVESPTR(PL_compcv); | |
1564 | ||
ea726b52 | 1565 | cv = PL_compcv = MUTABLE_CV(newSV_type(SvTYPE(proto))); |
c794ca97 | 1566 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE|CVf_CVGV_RC); |
dd2155a4 DM |
1567 | CvCLONED_on(cv); |
1568 | ||
dd2155a4 | 1569 | #ifdef USE_ITHREADS |
aed2304a NC |
1570 | CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto) |
1571 | : savepv(CvFILE(proto)); | |
dd2155a4 DM |
1572 | #else |
1573 | CvFILE(cv) = CvFILE(proto); | |
1574 | #endif | |
b3f91e91 | 1575 | CvGV_set(cv,CvGV(proto)); |
dd2155a4 | 1576 | CvSTASH(cv) = CvSTASH(proto); |
4c74a7df DM |
1577 | if (CvSTASH(cv)) |
1578 | Perl_sv_add_backref(aTHX_ MUTABLE_SV(CvSTASH(cv)), MUTABLE_SV(cv)); | |
b34c0dd4 | 1579 | OP_REFCNT_LOCK; |
dd2155a4 | 1580 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 | 1581 | OP_REFCNT_UNLOCK; |
dd2155a4 | 1582 | CvSTART(cv) = CvSTART(proto); |
ea726b52 | 1583 | CvOUTSIDE(cv) = MUTABLE_CV(SvREFCNT_inc_simple(outside)); |
b5c19bd7 | 1584 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
dd2155a4 DM |
1585 | |
1586 | if (SvPOK(proto)) | |
ad64d0ec | 1587 | sv_setpvn(MUTABLE_SV(cv), SvPVX_const(proto), SvCUR(proto)); |
dd2155a4 | 1588 | |
b7787f18 | 1589 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
dd2155a4 | 1590 | |
b5c19bd7 | 1591 | av_fill(PL_comppad, fpad); |
dd2155a4 DM |
1592 | for (ix = fname; ix >= 0; ix--) |
1593 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1594 | ||
dd2155a4 DM |
1595 | PL_curpad = AvARRAY(PL_comppad); |
1596 | ||
71f882da | 1597 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 | 1598 | |
dd2155a4 | 1599 | for (ix = fpad; ix > 0; ix--) { |
a0714e2c SS |
1600 | SV* const namesv = (ix <= fname) ? pname[ix] : NULL; |
1601 | SV *sv = NULL; | |
71f882da | 1602 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
b5c19bd7 | 1603 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
809abb02 | 1604 | sv = outpad[PARENT_PAD_INDEX(namesv)]; |
71f882da | 1605 | assert(sv); |
33894c1a DM |
1606 | /* formats may have an inactive parent, |
1607 | while my $x if $false can leave an active var marked as | |
d1186544 DM |
1608 | stale. And state vars are always available */ |
1609 | if (SvPADSTALE(sv) && !SvPAD_STATE(namesv)) { | |
a2a5de95 NC |
1610 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
1611 | "Variable \"%s\" is not available", SvPVX_const(namesv)); | |
a0714e2c | 1612 | sv = NULL; |
71f882da | 1613 | } |
33894c1a | 1614 | else |
f84c484e | 1615 | SvREFCNT_inc_simple_void_NN(sv); |
dd2155a4 | 1616 | } |
71f882da | 1617 | if (!sv) { |
b15aece3 | 1618 | const char sigil = SvPVX_const(namesv)[0]; |
e1ec3a88 | 1619 | if (sigil == '&') |
dd2155a4 | 1620 | sv = SvREFCNT_inc(ppad[ix]); |
e1ec3a88 | 1621 | else if (sigil == '@') |
ad64d0ec | 1622 | sv = MUTABLE_SV(newAV()); |
e1ec3a88 | 1623 | else if (sigil == '%') |
ad64d0ec | 1624 | sv = MUTABLE_SV(newHV()); |
dd2155a4 | 1625 | else |
561b68a9 | 1626 | sv = newSV(0); |
235cc2e3 | 1627 | SvPADMY_on(sv); |
0d3b281c DM |
1628 | /* reset the 'assign only once' flag on each state var */ |
1629 | if (SvPAD_STATE(namesv)) | |
1630 | SvPADSTALE_on(sv); | |
dd2155a4 DM |
1631 | } |
1632 | } | |
1633 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
f84c484e | 1634 | sv = SvREFCNT_inc_NN(ppad[ix]); |
dd2155a4 DM |
1635 | } |
1636 | else { | |
561b68a9 | 1637 | sv = newSV(0); |
dd2155a4 | 1638 | SvPADTMP_on(sv); |
dd2155a4 | 1639 | } |
71f882da | 1640 | PL_curpad[ix] = sv; |
dd2155a4 DM |
1641 | } |
1642 | ||
dd2155a4 DM |
1643 | DEBUG_Xv( |
1644 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1645 | cv_dump(outside, "Outside"); | |
1646 | cv_dump(proto, "Proto"); | |
1647 | cv_dump(cv, "To"); | |
1648 | ); | |
1649 | ||
1650 | LEAVE; | |
1651 | ||
1652 | if (CvCONST(cv)) { | |
b5c19bd7 DM |
1653 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1654 | * The prototype was marked as a candiate for const-ization, | |
1655 | * so try to grab the current const value, and if successful, | |
1656 | * turn into a const sub: | |
1657 | */ | |
551405c4 | 1658 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 DM |
1659 | if (const_sv) { |
1660 | SvREFCNT_dec(cv); | |
bd61b366 | 1661 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); |
b5c19bd7 DM |
1662 | } |
1663 | else { | |
1664 | CvCONST_off(cv); | |
1665 | } | |
dd2155a4 DM |
1666 | } |
1667 | ||
1668 | return cv; | |
1669 | } | |
1670 | ||
1671 | ||
1672 | /* | |
1673 | =for apidoc pad_fixup_inner_anons | |
1674 | ||
1675 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1676 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1677 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1678 | |
1679 | =cut | |
1680 | */ | |
1681 | ||
1682 | void | |
1683 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1684 | { | |
97aff369 | 1685 | dVAR; |
dd2155a4 | 1686 | I32 ix; |
502c6561 NC |
1687 | AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
1688 | AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]); | |
53c1dcc0 AL |
1689 | SV ** const namepad = AvARRAY(comppad_name); |
1690 | SV ** const curpad = AvARRAY(comppad); | |
7918f24d NC |
1691 | |
1692 | PERL_ARGS_ASSERT_PAD_FIXUP_INNER_ANONS; | |
294a48e9 AL |
1693 | PERL_UNUSED_ARG(old_cv); |
1694 | ||
dd2155a4 | 1695 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
551405c4 | 1696 | const SV * const namesv = namepad[ix]; |
dd2155a4 | 1697 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 1698 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 1699 | { |
ea726b52 | 1700 | CV * const innercv = MUTABLE_CV(curpad[ix]); |
7dafbf52 DM |
1701 | assert(CvWEAKOUTSIDE(innercv)); |
1702 | assert(CvOUTSIDE(innercv) == old_cv); | |
1703 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1704 | } |
1705 | } | |
1706 | } | |
1707 | ||
7dafbf52 | 1708 | |
dd2155a4 DM |
1709 | /* |
1710 | =for apidoc pad_push | |
1711 | ||
1712 | Push a new pad frame onto the padlist, unless there's already a pad at | |
26019298 AL |
1713 | this depth, in which case don't bother creating a new one. Then give |
1714 | the new pad an @_ in slot zero. | |
dd2155a4 DM |
1715 | |
1716 | =cut | |
1717 | */ | |
1718 | ||
1719 | void | |
26019298 | 1720 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 | 1721 | { |
97aff369 | 1722 | dVAR; |
7918f24d NC |
1723 | |
1724 | PERL_ARGS_ASSERT_PAD_PUSH; | |
1725 | ||
b37c2d43 | 1726 | if (depth > AvFILLp(padlist)) { |
44f8325f AL |
1727 | SV** const svp = AvARRAY(padlist); |
1728 | AV* const newpad = newAV(); | |
1729 | SV** const oldpad = AvARRAY(svp[depth-1]); | |
502c6561 NC |
1730 | I32 ix = AvFILLp((const AV *)svp[1]); |
1731 | const I32 names_fill = AvFILLp((const AV *)svp[0]); | |
44f8325f | 1732 | SV** const names = AvARRAY(svp[0]); |
26019298 AL |
1733 | AV *av; |
1734 | ||
dd2155a4 DM |
1735 | for ( ;ix > 0; ix--) { |
1736 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
b15aece3 | 1737 | const char sigil = SvPVX_const(names[ix])[0]; |
fda94784 RGS |
1738 | if ((SvFLAGS(names[ix]) & SVf_FAKE) |
1739 | || (SvFLAGS(names[ix]) & SVpad_STATE) | |
1740 | || sigil == '&') | |
1741 | { | |
dd2155a4 DM |
1742 | /* outer lexical or anon code */ |
1743 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1744 | } | |
1745 | else { /* our own lexical */ | |
26019298 AL |
1746 | SV *sv; |
1747 | if (sigil == '@') | |
ad64d0ec | 1748 | sv = MUTABLE_SV(newAV()); |
26019298 | 1749 | else if (sigil == '%') |
ad64d0ec | 1750 | sv = MUTABLE_SV(newHV()); |
dd2155a4 | 1751 | else |
561b68a9 | 1752 | sv = newSV(0); |
26019298 | 1753 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1754 | SvPADMY_on(sv); |
1755 | } | |
1756 | } | |
1757 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
f84c484e | 1758 | av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix])); |
dd2155a4 DM |
1759 | } |
1760 | else { | |
1761 | /* save temporaries on recursion? */ | |
561b68a9 | 1762 | SV * const sv = newSV(0); |
26019298 | 1763 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1764 | SvPADTMP_on(sv); |
1765 | } | |
1766 | } | |
26019298 | 1767 | av = newAV(); |
ad64d0ec | 1768 | av_store(newpad, 0, MUTABLE_SV(av)); |
11ca45c0 | 1769 | AvREIFY_only(av); |
26019298 | 1770 | |
ad64d0ec | 1771 | av_store(padlist, depth, MUTABLE_SV(newpad)); |
dd2155a4 DM |
1772 | AvFILLp(padlist) = depth; |
1773 | } | |
1774 | } | |
b21dc031 AL |
1775 | |
1776 | ||
1777 | HV * | |
1778 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) | |
1779 | { | |
97aff369 | 1780 | dVAR; |
551405c4 | 1781 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
00b1698f | 1782 | if ( SvPAD_TYPED(*av) ) { |
b21dc031 AL |
1783 | return SvSTASH(*av); |
1784 | } | |
5c284bb0 | 1785 | return NULL; |
b21dc031 | 1786 | } |
66610fdd | 1787 | |
d5b1589c NC |
1788 | #if defined(USE_ITHREADS) |
1789 | ||
1790 | # define av_dup_inc(s,t) MUTABLE_AV(sv_dup_inc((const SV *)s,t)) | |
1791 | ||
1792 | AV * | |
1793 | Perl_padlist_dup(pTHX_ AV *const srcpad, CLONE_PARAMS *const param) | |
1794 | { | |
1795 | AV *dstpad; | |
1796 | PERL_ARGS_ASSERT_PADLIST_DUP; | |
1797 | ||
1798 | if (!srcpad) | |
1799 | return NULL; | |
1800 | ||
1801 | assert(!AvREAL(srcpad)); | |
6de654a5 NC |
1802 | |
1803 | if (param->flags & CLONEf_COPY_STACKS | |
1804 | || SvREFCNT(AvARRAY(srcpad)[1]) > 1) { | |
1805 | /* XXX padlists are real, but pretend to be not */ | |
1806 | AvREAL_on(srcpad); | |
1807 | dstpad = av_dup_inc(srcpad, param); | |
1808 | AvREAL_off(srcpad); | |
1809 | AvREAL_off(dstpad); | |
1810 | assert (SvREFCNT(AvARRAY(srcpad)[1]) == 1); | |
1811 | } else { | |
1812 | /* CvDEPTH() on our subroutine will be set to 0, so there's no need | |
1813 | to build anything other than the first level of pads. */ | |
1814 | ||
1815 | I32 ix = AvFILLp((const AV *)AvARRAY(srcpad)[1]); | |
1816 | AV *pad1; | |
05d04d9c | 1817 | const I32 names_fill = AvFILLp((const AV *)(AvARRAY(srcpad)[0])); |
6de654a5 NC |
1818 | const AV *const srcpad1 = (const AV *) AvARRAY(srcpad)[1]; |
1819 | SV **oldpad = AvARRAY(srcpad1); | |
1820 | SV **names; | |
1821 | SV **pad1a; | |
1822 | AV *args; | |
1823 | /* look for it in the table first. | |
1824 | I *think* that it shouldn't be possible to find it there. | |
1825 | Well, except for how Perl_sv_compile_2op() "works" :-( */ | |
1826 | dstpad = (AV*)ptr_table_fetch(PL_ptr_table, srcpad); | |
1827 | ||
1828 | if (dstpad) | |
1829 | return dstpad; | |
1830 | ||
1831 | dstpad = newAV(); | |
1832 | ptr_table_store(PL_ptr_table, srcpad, dstpad); | |
1833 | AvREAL_off(dstpad); | |
1834 | av_extend(dstpad, 1); | |
1835 | AvARRAY(dstpad)[0] = MUTABLE_SV(av_dup_inc(AvARRAY(srcpad)[0], param)); | |
1836 | names = AvARRAY(AvARRAY(dstpad)[0]); | |
1837 | ||
1838 | pad1 = newAV(); | |
1839 | ||
1840 | av_extend(pad1, ix); | |
1841 | AvARRAY(dstpad)[1] = MUTABLE_SV(pad1); | |
1842 | pad1a = AvARRAY(pad1); | |
1843 | AvFILLp(dstpad) = 1; | |
1844 | ||
1845 | if (ix > -1) { | |
1846 | AvFILLp(pad1) = ix; | |
1847 | ||
1848 | for ( ;ix > 0; ix--) { | |
05d04d9c NC |
1849 | if (!oldpad[ix]) { |
1850 | pad1a[ix] = NULL; | |
1851 | } else if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
1852 | const char sigil = SvPVX_const(names[ix])[0]; | |
1853 | if ((SvFLAGS(names[ix]) & SVf_FAKE) | |
1854 | || (SvFLAGS(names[ix]) & SVpad_STATE) | |
1855 | || sigil == '&') | |
1856 | { | |
1857 | /* outer lexical or anon code */ | |
1858 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); | |
1859 | } | |
1860 | else { /* our own lexical */ | |
adf8f095 NC |
1861 | if(SvPADSTALE(oldpad[ix]) && SvREFCNT(oldpad[ix]) > 1) { |
1862 | /* This is a work around for how the current | |
1863 | implementation of ?{ } blocks in regexps | |
1864 | interacts with lexicals. */ | |
05d04d9c NC |
1865 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); |
1866 | } else { | |
1867 | SV *sv; | |
1868 | ||
1869 | if (sigil == '@') | |
1870 | sv = MUTABLE_SV(newAV()); | |
1871 | else if (sigil == '%') | |
1872 | sv = MUTABLE_SV(newHV()); | |
1873 | else | |
1874 | sv = newSV(0); | |
1875 | pad1a[ix] = sv; | |
1876 | SvPADMY_on(sv); | |
1877 | } | |
1878 | } | |
1879 | } | |
1880 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
1881 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); | |
1882 | } | |
1883 | else { | |
1884 | /* save temporaries on recursion? */ | |
1885 | SV * const sv = newSV(0); | |
1886 | pad1a[ix] = sv; | |
1887 | ||
1888 | /* SvREFCNT(oldpad[ix]) != 1 for some code in threads.xs | |
1889 | FIXTHAT before merging this branch. | |
1890 | (And I know how to) */ | |
1891 | if (SvPADMY(oldpad[ix])) | |
1892 | SvPADMY_on(sv); | |
1893 | else | |
1894 | SvPADTMP_on(sv); | |
1895 | } | |
6de654a5 NC |
1896 | } |
1897 | ||
1898 | if (oldpad[0]) { | |
1899 | args = newAV(); /* Will be @_ */ | |
1900 | AvREIFY_only(args); | |
1901 | pad1a[0] = (SV *)args; | |
1902 | } | |
1903 | } | |
1904 | } | |
d5b1589c NC |
1905 | |
1906 | return dstpad; | |
1907 | } | |
1908 | ||
1909 | #endif | |
1910 | ||
66610fdd RGS |
1911 | /* |
1912 | * Local variables: | |
1913 | * c-indentation-style: bsd | |
1914 | * c-basic-offset: 4 | |
1915 | * indent-tabs-mode: t | |
1916 | * End: | |
1917 | * | |
37442d52 RGS |
1918 | * ex: set ts=8 sts=4 sw=4 noet: |
1919 | */ |