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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) { | |
135 | static int pegcnt; | |
7918f24d NC |
136 | |
137 | PERL_ARGS_ASSERT_PAD_PEG; | |
138 | ||
1dba731d NC |
139 | pegcnt++; |
140 | } | |
141 | #endif | |
dd2155a4 DM |
142 | |
143 | /* | |
144 | =for apidoc pad_new | |
145 | ||
146 | Create a new compiling padlist, saving and updating the various global | |
147 | vars at the same time as creating the pad itself. The following flags | |
148 | can be OR'ed together: | |
149 | ||
150 | padnew_CLONE this pad is for a cloned CV | |
151 | padnew_SAVE save old globals | |
152 | padnew_SAVESUB also save extra stuff for start of sub | |
153 | ||
154 | =cut | |
155 | */ | |
156 | ||
157 | PADLIST * | |
c7c737cb | 158 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 | 159 | { |
97aff369 | 160 | dVAR; |
e1ec3a88 | 161 | AV *padlist, *padname, *pad; |
dd2155a4 | 162 | |
f3548bdc DM |
163 | ASSERT_CURPAD_LEGAL("pad_new"); |
164 | ||
dd2155a4 DM |
165 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
166 | * vars (based on flags) rather than storing vals + addresses for | |
167 | * each individually. Also see pad_block_start. | |
168 | * XXX DAPM Try to see whether all these conditionals are required | |
169 | */ | |
170 | ||
171 | /* save existing state, ... */ | |
172 | ||
173 | if (flags & padnew_SAVE) { | |
3979c56f | 174 | SAVECOMPPAD(); |
dd2155a4 DM |
175 | SAVESPTR(PL_comppad_name); |
176 | if (! (flags & padnew_CLONE)) { | |
177 | SAVEI32(PL_padix); | |
178 | SAVEI32(PL_comppad_name_fill); | |
179 | SAVEI32(PL_min_intro_pending); | |
180 | SAVEI32(PL_max_intro_pending); | |
8bbe96d7 | 181 | SAVEBOOL(PL_cv_has_eval); |
dd2155a4 | 182 | if (flags & padnew_SAVESUB) { |
f0cb02e3 | 183 | SAVEBOOL(PL_pad_reset_pending); |
dd2155a4 DM |
184 | } |
185 | } | |
186 | } | |
187 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
188 | * saved - check at some pt that this is okay */ | |
189 | ||
190 | /* ... create new pad ... */ | |
191 | ||
192 | padlist = newAV(); | |
193 | padname = newAV(); | |
194 | pad = newAV(); | |
195 | ||
196 | if (flags & padnew_CLONE) { | |
197 | /* XXX DAPM I dont know why cv_clone needs it | |
198 | * doing differently yet - perhaps this separate branch can be | |
199 | * dispensed with eventually ??? | |
200 | */ | |
201 | ||
e1ec3a88 | 202 | AV * const a0 = newAV(); /* will be @_ */ |
dd2155a4 | 203 | av_extend(a0, 0); |
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 */ | |
424 | /* XXX DAPM since slot has been allocated, replace | |
425 | * av_store with PL_curpad[offset] ? */ | |
426 | if (*name == '@') | |
427 | av_store(PL_comppad, offset, MUTABLE_SV(newAV())); | |
428 | else if (*name == '%') | |
429 | av_store(PL_comppad, offset, MUTABLE_SV(newHV())); | |
430 | SvPADMY_on(PL_curpad[offset]); | |
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 DM |
707 | /* |
708 | =for apidoc pad_findlex | |
709 | ||
710 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
b5c19bd7 DM |
711 | in the inner pads if it's found in an outer one. |
712 | ||
713 | Returns the offset in the bottom pad of the lex or the fake lex. | |
714 | cv is the CV in which to start the search, and seq is the current cop_seq | |
715 | to match against. If warn is true, print appropriate warnings. The out_* | |
716 | vars return values, and so are pointers to where the returned values | |
717 | should be stored. out_capture, if non-null, requests that the innermost | |
718 | instance of the lexical is captured; out_name_sv is set to the innermost | |
719 | matched namesv or fake namesv; out_flags returns the flags normally | |
720 | associated with the IVX field of a fake namesv. | |
721 | ||
722 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, | |
723 | then comes back down, adding fake entries as it goes. It has to be this way | |
3441fb63 | 724 | because fake namesvs in anon protoypes have to store in xlow the index into |
b5c19bd7 | 725 | the parent pad. |
dd2155a4 DM |
726 | |
727 | =cut | |
728 | */ | |
729 | ||
b5c19bd7 DM |
730 | /* the CV has finished being compiled. This is not a sufficient test for |
731 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
732 | #define CvCOMPILED(cv) CvROOT(cv) | |
733 | ||
71f882da DM |
734 | /* the CV does late binding of its lexicals */ |
735 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) | |
736 | ||
b5c19bd7 | 737 | |
dd2155a4 | 738 | STATIC PADOFFSET |
e1ec3a88 | 739 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
b5c19bd7 | 740 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 | 741 | { |
97aff369 | 742 | dVAR; |
b5c19bd7 DM |
743 | I32 offset, new_offset; |
744 | SV *new_capture; | |
745 | SV **new_capturep; | |
b64e5050 | 746 | const AV * const padlist = CvPADLIST(cv); |
dd2155a4 | 747 | |
7918f24d NC |
748 | PERL_ARGS_ASSERT_PAD_FINDLEX; |
749 | ||
b5c19bd7 | 750 | *out_flags = 0; |
a3985cdc | 751 | |
b5c19bd7 DM |
752 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
753 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", | |
754 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); | |
dd2155a4 | 755 | |
b5c19bd7 | 756 | /* first, search this pad */ |
dd2155a4 | 757 | |
b5c19bd7 DM |
758 | if (padlist) { /* not an undef CV */ |
759 | I32 fake_offset = 0; | |
502c6561 | 760 | const AV * const nameav = MUTABLE_AV(AvARRAY(padlist)[0]); |
551405c4 | 761 | SV * const * const name_svp = AvARRAY(nameav); |
ee6cee0c | 762 | |
b5c19bd7 | 763 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
551405c4 | 764 | const SV * const namesv = name_svp[offset]; |
b5c19bd7 | 765 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 766 | && strEQ(SvPVX_const(namesv), name)) |
b5c19bd7 DM |
767 | { |
768 | if (SvFAKE(namesv)) | |
769 | fake_offset = offset; /* in case we don't find a real one */ | |
809abb02 NC |
770 | else if ( seq > COP_SEQ_RANGE_LOW(namesv) /* min */ |
771 | && seq <= COP_SEQ_RANGE_HIGH(namesv)) /* max */ | |
b5c19bd7 | 772 | break; |
ee6cee0c DM |
773 | } |
774 | } | |
775 | ||
b5c19bd7 DM |
776 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
777 | if (offset > 0) { /* not fake */ | |
778 | fake_offset = 0; | |
779 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
780 | ||
781 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
782 | * instances. For now, we just test !CvUNIQUE(cv), but | |
783 | * ideally, we should detect my's declared within loops | |
784 | * etc - this would allow a wider range of 'not stayed | |
785 | * shared' warnings. We also treated alreadly-compiled | |
786 | * lexes as not multi as viewed from evals. */ | |
787 | ||
788 | *out_flags = CvANON(cv) ? | |
789 | PAD_FAKELEX_ANON : | |
790 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
791 | ? PAD_FAKELEX_MULTI : 0; | |
792 | ||
793 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
809abb02 NC |
794 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%lu,%lu)\n", |
795 | PTR2UV(cv), (long)offset, | |
796 | (unsigned long)COP_SEQ_RANGE_LOW(*out_name_sv), | |
797 | (unsigned long)COP_SEQ_RANGE_HIGH(*out_name_sv))); | |
b5c19bd7 DM |
798 | } |
799 | else { /* fake match */ | |
800 | offset = fake_offset; | |
801 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
809abb02 | 802 | *out_flags = PARENT_FAKELEX_FLAGS(*out_name_sv); |
b5c19bd7 | 803 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
19a5c512 | 804 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 | 805 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
809abb02 | 806 | (unsigned long) PARENT_PAD_INDEX(*out_name_sv) |
b5c19bd7 DM |
807 | )); |
808 | } | |
dd2155a4 | 809 | |
b5c19bd7 | 810 | /* return the lex? */ |
dd2155a4 | 811 | |
b5c19bd7 | 812 | if (out_capture) { |
dd2155a4 | 813 | |
b5c19bd7 | 814 | /* our ? */ |
00b1698f | 815 | if (SvPAD_OUR(*out_name_sv)) { |
a0714e2c | 816 | *out_capture = NULL; |
b5c19bd7 DM |
817 | return offset; |
818 | } | |
ee6cee0c | 819 | |
b5c19bd7 DM |
820 | /* trying to capture from an anon prototype? */ |
821 | if (CvCOMPILED(cv) | |
822 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
823 | : *out_flags & PAD_FAKELEX_ANON) | |
824 | { | |
a2a5de95 NC |
825 | if (warn) |
826 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), | |
827 | "Variable \"%s\" is not available", name); | |
a0714e2c | 828 | *out_capture = NULL; |
b5c19bd7 | 829 | } |
ee6cee0c | 830 | |
b5c19bd7 DM |
831 | /* real value */ |
832 | else { | |
833 | int newwarn = warn; | |
834 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
d1186544 | 835 | && !SvPAD_STATE(name_svp[offset]) |
b5c19bd7 DM |
836 | && warn && ckWARN(WARN_CLOSURE)) { |
837 | newwarn = 0; | |
838 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
839 | "Variable \"%s\" will not stay shared", name); | |
840 | } | |
dd2155a4 | 841 | |
b5c19bd7 DM |
842 | if (fake_offset && CvANON(cv) |
843 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
844 | { | |
845 | SV *n; | |
846 | /* not yet caught - look further up */ | |
847 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
848 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", | |
849 | PTR2UV(cv))); | |
850 | n = *out_name_sv; | |
282e1742 DM |
851 | (void) pad_findlex(name, CvOUTSIDE(cv), |
852 | CvOUTSIDE_SEQ(cv), | |
b5c19bd7 DM |
853 | newwarn, out_capture, out_name_sv, out_flags); |
854 | *out_name_sv = n; | |
855 | return offset; | |
dd2155a4 | 856 | } |
b5c19bd7 | 857 | |
502c6561 NC |
858 | *out_capture = AvARRAY(MUTABLE_AV(AvARRAY(padlist)[ |
859 | CvDEPTH(cv) ? CvDEPTH(cv) : 1]))[offset]; | |
b5c19bd7 DM |
860 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
861 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", | |
19a5c512 | 862 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 | 863 | |
d1186544 DM |
864 | if (SvPADSTALE(*out_capture) |
865 | && !SvPAD_STATE(name_svp[offset])) | |
866 | { | |
a2a5de95 NC |
867 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
868 | "Variable \"%s\" is not available", name); | |
a0714e2c | 869 | *out_capture = NULL; |
dd2155a4 DM |
870 | } |
871 | } | |
b5c19bd7 DM |
872 | if (!*out_capture) { |
873 | if (*name == '@') | |
ad64d0ec | 874 | *out_capture = sv_2mortal(MUTABLE_SV(newAV())); |
b5c19bd7 | 875 | else if (*name == '%') |
ad64d0ec | 876 | *out_capture = sv_2mortal(MUTABLE_SV(newHV())); |
b5c19bd7 DM |
877 | else |
878 | *out_capture = sv_newmortal(); | |
879 | } | |
dd2155a4 | 880 | } |
b5c19bd7 DM |
881 | |
882 | return offset; | |
ee6cee0c | 883 | } |
b5c19bd7 DM |
884 | } |
885 | ||
886 | /* it's not in this pad - try above */ | |
887 | ||
888 | if (!CvOUTSIDE(cv)) | |
889 | return NOT_IN_PAD; | |
9f7d9405 | 890 | |
b5c19bd7 | 891 | /* out_capture non-null means caller wants us to capture lex; in |
71f882da | 892 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 893 | new_capturep = out_capture ? out_capture : |
4608196e | 894 | CvLATE(cv) ? NULL : &new_capture; |
b5c19bd7 DM |
895 | |
896 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
897 | new_capturep, out_name_sv, out_flags); | |
9f7d9405 | 898 | if ((PADOFFSET)offset == NOT_IN_PAD) |
b5c19bd7 | 899 | return NOT_IN_PAD; |
9f7d9405 | 900 | |
b5c19bd7 DM |
901 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
902 | ||
903 | /* don't add new fake entries (via eval) to CVs that we have already | |
904 | * finished compiling, or to undef CVs */ | |
905 | if (CvCOMPILED(cv) || !padlist) | |
906 | return 0; /* this dummy (and invalid) value isnt used by the caller */ | |
907 | ||
908 | { | |
3291825f NC |
909 | /* This relies on sv_setsv_flags() upgrading the destination to the same |
910 | type as the source, independant of the flags set, and on it being | |
911 | "good" and only copying flag bits and pointers that it understands. | |
912 | */ | |
913 | SV *new_namesv = newSVsv(*out_name_sv); | |
53c1dcc0 AL |
914 | AV * const ocomppad_name = PL_comppad_name; |
915 | PAD * const ocomppad = PL_comppad; | |
502c6561 NC |
916 | PL_comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
917 | PL_comppad = MUTABLE_AV(AvARRAY(padlist)[1]); | |
b5c19bd7 DM |
918 | PL_curpad = AvARRAY(PL_comppad); |
919 | ||
3291825f NC |
920 | new_offset |
921 | = pad_add_name_sv(new_namesv, | |
59cfed7d | 922 | (SvPAD_STATE(*out_name_sv) ? padadd_STATE : 0), |
3291825f NC |
923 | SvPAD_TYPED(*out_name_sv) |
924 | ? SvSTASH(*out_name_sv) : NULL, | |
925 | SvOURSTASH(*out_name_sv) | |
926 | ); | |
927 | ||
928 | SvFAKE_on(new_namesv); | |
929 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
930 | "Pad addname: %ld \"%.*s\" FAKE\n", | |
931 | (long)new_offset, | |
932 | (int) SvCUR(new_namesv), SvPVX(new_namesv))); | |
809abb02 | 933 | PARENT_FAKELEX_FLAGS_set(new_namesv, *out_flags); |
b5c19bd7 | 934 | |
809abb02 | 935 | PARENT_PAD_INDEX_set(new_namesv, 0); |
00b1698f | 936 | if (SvPAD_OUR(new_namesv)) { |
6f207bd3 | 937 | NOOP; /* do nothing */ |
b5c19bd7 | 938 | } |
71f882da | 939 | else if (CvLATE(cv)) { |
b5c19bd7 | 940 | /* delayed creation - just note the offset within parent pad */ |
809abb02 | 941 | PARENT_PAD_INDEX_set(new_namesv, offset); |
b5c19bd7 DM |
942 | CvCLONE_on(cv); |
943 | } | |
944 | else { | |
945 | /* immediate creation - capture outer value right now */ | |
946 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
947 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
948 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", | |
949 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
dd2155a4 | 950 | } |
b5c19bd7 | 951 | *out_name_sv = new_namesv; |
809abb02 | 952 | *out_flags = PARENT_FAKELEX_FLAGS(new_namesv); |
b5c19bd7 DM |
953 | |
954 | PL_comppad_name = ocomppad_name; | |
955 | PL_comppad = ocomppad; | |
4608196e | 956 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL; |
dd2155a4 | 957 | } |
b5c19bd7 | 958 | return new_offset; |
dd2155a4 DM |
959 | } |
960 | ||
fb8a9836 AL |
961 | |
962 | #ifdef DEBUGGING | |
dd2155a4 DM |
963 | /* |
964 | =for apidoc pad_sv | |
965 | ||
966 | Get the value at offset po in the current pad. | |
967 | Use macro PAD_SV instead of calling this function directly. | |
968 | ||
969 | =cut | |
970 | */ | |
971 | ||
972 | ||
973 | SV * | |
974 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
975 | { | |
97aff369 | 976 | dVAR; |
f3548bdc | 977 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 978 | |
dd2155a4 DM |
979 | if (!po) |
980 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
981 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
982 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 983 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
984 | ); |
985 | return PL_curpad[po]; | |
986 | } | |
987 | ||
988 | ||
989 | /* | |
990 | =for apidoc pad_setsv | |
991 | ||
992 | Set the entry at offset po in the current pad to sv. | |
993 | Use the macro PAD_SETSV() rather than calling this function directly. | |
994 | ||
995 | =cut | |
996 | */ | |
997 | ||
dd2155a4 DM |
998 | void |
999 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
1000 | { | |
97aff369 | 1001 | dVAR; |
7918f24d NC |
1002 | |
1003 | PERL_ARGS_ASSERT_PAD_SETSV; | |
1004 | ||
f3548bdc | 1005 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
1006 | |
1007 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1008 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 1009 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
1010 | ); |
1011 | PL_curpad[po] = sv; | |
1012 | } | |
1013 | #endif | |
1014 | ||
1015 | ||
1016 | ||
1017 | /* | |
1018 | =for apidoc pad_block_start | |
1019 | ||
1020 | Update the pad compilation state variables on entry to a new block | |
1021 | ||
1022 | =cut | |
1023 | */ | |
1024 | ||
1025 | /* XXX DAPM perhaps: | |
1026 | * - integrate this in general state-saving routine ??? | |
1027 | * - combine with the state-saving going on in pad_new ??? | |
1028 | * - introduce a new SAVE type that does all this in one go ? | |
1029 | */ | |
1030 | ||
1031 | void | |
1032 | Perl_pad_block_start(pTHX_ int full) | |
1033 | { | |
97aff369 | 1034 | dVAR; |
f3548bdc | 1035 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
1036 | SAVEI32(PL_comppad_name_floor); |
1037 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
1038 | if (full) | |
1039 | PL_comppad_name_fill = PL_comppad_name_floor; | |
1040 | if (PL_comppad_name_floor < 0) | |
1041 | PL_comppad_name_floor = 0; | |
1042 | SAVEI32(PL_min_intro_pending); | |
1043 | SAVEI32(PL_max_intro_pending); | |
1044 | PL_min_intro_pending = 0; | |
1045 | SAVEI32(PL_comppad_name_fill); | |
1046 | SAVEI32(PL_padix_floor); | |
1047 | PL_padix_floor = PL_padix; | |
1048 | PL_pad_reset_pending = FALSE; | |
1049 | } | |
1050 | ||
1051 | ||
1052 | /* | |
1053 | =for apidoc intro_my | |
1054 | ||
1055 | "Introduce" my variables to visible status. | |
1056 | ||
1057 | =cut | |
1058 | */ | |
1059 | ||
1060 | U32 | |
1061 | Perl_intro_my(pTHX) | |
1062 | { | |
97aff369 | 1063 | dVAR; |
dd2155a4 | 1064 | SV **svp; |
dd2155a4 DM |
1065 | I32 i; |
1066 | ||
f3548bdc | 1067 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
1068 | if (! PL_min_intro_pending) |
1069 | return PL_cop_seqmax; | |
1070 | ||
1071 | svp = AvARRAY(PL_comppad_name); | |
1072 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
53c1dcc0 AL |
1073 | SV * const sv = svp[i]; |
1074 | ||
809abb02 NC |
1075 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !COP_SEQ_RANGE_HIGH(sv)) { |
1076 | COP_SEQ_RANGE_HIGH_set(sv, PAD_MAX); /* Don't know scope end yet. */ | |
1077 | COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax); | |
dd2155a4 | 1078 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
809abb02 | 1079 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
b15aece3 | 1080 | (long)i, SvPVX_const(sv), |
809abb02 NC |
1081 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
1082 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
dd2155a4 DM |
1083 | ); |
1084 | } | |
1085 | } | |
1086 | PL_min_intro_pending = 0; | |
1087 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
1088 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1089 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
1090 | ||
1091 | return PL_cop_seqmax++; | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | =for apidoc pad_leavemy | |
1096 | ||
1097 | Cleanup at end of scope during compilation: set the max seq number for | |
1098 | lexicals in this scope and warn of any lexicals that never got introduced. | |
1099 | ||
1100 | =cut | |
1101 | */ | |
1102 | ||
1103 | void | |
1104 | Perl_pad_leavemy(pTHX) | |
1105 | { | |
97aff369 | 1106 | dVAR; |
dd2155a4 | 1107 | I32 off; |
551405c4 | 1108 | SV * const * const svp = AvARRAY(PL_comppad_name); |
dd2155a4 DM |
1109 | |
1110 | PL_pad_reset_pending = FALSE; | |
1111 | ||
f3548bdc | 1112 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
1113 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
1114 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
53c1dcc0 | 1115 | const SV * const sv = svp[off]; |
9b387841 NC |
1116 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv)) |
1117 | Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), | |
1118 | "%"SVf" never introduced", | |
1119 | SVfARG(sv)); | |
dd2155a4 DM |
1120 | } |
1121 | } | |
1122 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
1123 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
53c1dcc0 | 1124 | const SV * const sv = svp[off]; |
809abb02 NC |
1125 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && COP_SEQ_RANGE_HIGH(sv) == PAD_MAX) { |
1126 | COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax); | |
dd2155a4 | 1127 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
809abb02 | 1128 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
b15aece3 | 1129 | (long)off, SvPVX_const(sv), |
809abb02 NC |
1130 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
1131 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
dd2155a4 DM |
1132 | ); |
1133 | } | |
1134 | } | |
1135 | PL_cop_seqmax++; | |
1136 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1137 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1138 | } | |
1139 | ||
1140 | ||
1141 | /* | |
1142 | =for apidoc pad_swipe | |
1143 | ||
1144 | Abandon the tmp in the current pad at offset po and replace with a | |
1145 | new one. | |
1146 | ||
1147 | =cut | |
1148 | */ | |
1149 | ||
1150 | void | |
1151 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1152 | { | |
97aff369 | 1153 | dVAR; |
f3548bdc | 1154 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
1155 | if (!PL_curpad) |
1156 | return; | |
1157 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1158 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1159 | if (!po) | |
1160 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1161 | ||
1162 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1163 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1164 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1165 | ||
1166 | if (PL_curpad[po]) | |
1167 | SvPADTMP_off(PL_curpad[po]); | |
1168 | if (refadjust) | |
1169 | SvREFCNT_dec(PL_curpad[po]); | |
1170 | ||
9ad9869c DM |
1171 | |
1172 | /* if pad tmps aren't shared between ops, then there's no need to | |
1173 | * create a new tmp when an existing op is freed */ | |
1174 | #ifdef USE_BROKEN_PAD_RESET | |
561b68a9 | 1175 | PL_curpad[po] = newSV(0); |
dd2155a4 | 1176 | SvPADTMP_on(PL_curpad[po]); |
9ad9869c DM |
1177 | #else |
1178 | PL_curpad[po] = &PL_sv_undef; | |
97bf4a8d | 1179 | #endif |
dd2155a4 DM |
1180 | if ((I32)po < PL_padix) |
1181 | PL_padix = po - 1; | |
1182 | } | |
1183 | ||
1184 | ||
1185 | /* | |
1186 | =for apidoc pad_reset | |
1187 | ||
1188 | Mark all the current temporaries for reuse | |
1189 | ||
1190 | =cut | |
1191 | */ | |
1192 | ||
1193 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1194 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1195 | * on the stack by OPs that use them, there are several ways to get an alias | |
1196 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1197 | * We avoid doing this until we can think of a Better Way. | |
1198 | * GSAR 97-10-29 */ | |
1f676739 | 1199 | static void |
82af08ae | 1200 | S_pad_reset(pTHX) |
dd2155a4 | 1201 | { |
97aff369 | 1202 | dVAR; |
dd2155a4 | 1203 | #ifdef USE_BROKEN_PAD_RESET |
dd2155a4 DM |
1204 | if (AvARRAY(PL_comppad) != PL_curpad) |
1205 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1206 | ||
1207 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1208 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1209 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1210 | (long)PL_padix, (long)PL_padix_floor | |
1211 | ) | |
1212 | ); | |
1213 | ||
1214 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
e1ec3a88 | 1215 | register I32 po; |
dd2155a4 DM |
1216 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1217 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1218 | SvPADTMP_off(PL_curpad[po]); | |
1219 | } | |
1220 | PL_padix = PL_padix_floor; | |
1221 | } | |
1222 | #endif | |
1223 | PL_pad_reset_pending = FALSE; | |
1224 | } | |
1225 | ||
1226 | ||
1227 | /* | |
1228 | =for apidoc pad_tidy | |
1229 | ||
1230 | Tidy up a pad after we've finished compiling it: | |
1231 | * remove most stuff from the pads of anonsub prototypes; | |
1232 | * give it a @_; | |
1233 | * mark tmps as such. | |
1234 | ||
1235 | =cut | |
1236 | */ | |
1237 | ||
1238 | /* XXX DAPM surely most of this stuff should be done properly | |
1239 | * at the right time beforehand, rather than going around afterwards | |
1240 | * cleaning up our mistakes ??? | |
1241 | */ | |
1242 | ||
1243 | void | |
1244 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1245 | { | |
27da23d5 | 1246 | dVAR; |
dd2155a4 | 1247 | |
f3548bdc | 1248 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 DM |
1249 | |
1250 | /* If this CV has had any 'eval-capable' ops planted in it | |
1251 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any | |
1252 | * anon prototypes in the chain of CVs should be marked as cloneable, | |
1253 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets | |
1254 | * the right CvOUTSIDE. | |
1255 | * If running with -d, *any* sub may potentially have an eval | |
1256 | * excuted within it. | |
1257 | */ | |
1258 | ||
1259 | if (PL_cv_has_eval || PL_perldb) { | |
e1ec3a88 | 1260 | const CV *cv; |
b5c19bd7 DM |
1261 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1262 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1263 | break; /* no need to mark already-compiled code */ | |
1264 | if (CvANON(cv)) { | |
1265 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1266 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); | |
1267 | CvCLONE_on(cv); | |
1268 | } | |
1269 | } | |
1270 | } | |
1271 | ||
dd2155a4 DM |
1272 | /* extend curpad to match namepad */ |
1273 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
a0714e2c | 1274 | av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
dd2155a4 DM |
1275 | |
1276 | if (type == padtidy_SUBCLONE) { | |
551405c4 | 1277 | SV * const * const namep = AvARRAY(PL_comppad_name); |
504618e9 | 1278 | PADOFFSET ix; |
b5c19bd7 | 1279 | |
dd2155a4 DM |
1280 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1281 | SV *namesv; | |
1282 | ||
1283 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1284 | continue; | |
1285 | /* | |
1286 | * The only things that a clonable function needs in its | |
b5c19bd7 | 1287 | * pad are anonymous subs. |
dd2155a4 DM |
1288 | * The rest are created anew during cloning. |
1289 | */ | |
a0714e2c | 1290 | if (!((namesv = namep[ix]) != NULL && |
dd2155a4 | 1291 | namesv != &PL_sv_undef && |
b15aece3 | 1292 | *SvPVX_const(namesv) == '&')) |
dd2155a4 DM |
1293 | { |
1294 | SvREFCNT_dec(PL_curpad[ix]); | |
a0714e2c | 1295 | PL_curpad[ix] = NULL; |
dd2155a4 DM |
1296 | } |
1297 | } | |
1298 | } | |
1299 | else if (type == padtidy_SUB) { | |
1300 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
53c1dcc0 | 1301 | AV * const av = newAV(); /* Will be @_ */ |
dd2155a4 | 1302 | av_extend(av, 0); |
ad64d0ec | 1303 | av_store(PL_comppad, 0, MUTABLE_SV(av)); |
11ca45c0 | 1304 | AvREIFY_only(av); |
dd2155a4 DM |
1305 | } |
1306 | ||
1307 | /* XXX DAPM rationalise these two similar branches */ | |
1308 | ||
1309 | if (type == padtidy_SUB) { | |
504618e9 | 1310 | PADOFFSET ix; |
dd2155a4 DM |
1311 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1312 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1313 | continue; | |
1314 | if (!SvPADMY(PL_curpad[ix])) | |
1315 | SvPADTMP_on(PL_curpad[ix]); | |
1316 | } | |
1317 | } | |
1318 | else if (type == padtidy_FORMAT) { | |
504618e9 | 1319 | PADOFFSET ix; |
dd2155a4 DM |
1320 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1321 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1322 | SvPADTMP_on(PL_curpad[ix]); | |
1323 | } | |
1324 | } | |
f3548bdc | 1325 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1326 | } |
1327 | ||
1328 | ||
1329 | /* | |
1330 | =for apidoc pad_free | |
1331 | ||
8627550a | 1332 | Free the SV at offset po in the current pad. |
dd2155a4 DM |
1333 | |
1334 | =cut | |
1335 | */ | |
1336 | ||
1337 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1338 | void | |
1339 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1340 | { | |
97aff369 | 1341 | dVAR; |
f3548bdc | 1342 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1343 | if (!PL_curpad) |
1344 | return; | |
1345 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1346 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1347 | if (!po) | |
1348 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1349 | ||
1350 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1351 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1352 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1353 | ); | |
1354 | ||
1355 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1356 | SvPADTMP_off(PL_curpad[po]); | |
1357 | #ifdef USE_ITHREADS | |
7e736055 | 1358 | /* SV could be a shared hash key (eg bugid #19022) */ |
ddea3ea7 | 1359 | if (!SvIsCOW(PL_curpad[po])) |
dd2155a4 | 1360 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1361 | #endif |
1362 | } | |
1363 | if ((I32)po < PL_padix) | |
1364 | PL_padix = po - 1; | |
1365 | } | |
1366 | ||
1367 | ||
1368 | ||
1369 | /* | |
1370 | =for apidoc do_dump_pad | |
1371 | ||
1372 | Dump the contents of a padlist | |
1373 | ||
1374 | =cut | |
1375 | */ | |
1376 | ||
1377 | void | |
1378 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1379 | { | |
97aff369 | 1380 | dVAR; |
e1ec3a88 AL |
1381 | const AV *pad_name; |
1382 | const AV *pad; | |
dd2155a4 DM |
1383 | SV **pname; |
1384 | SV **ppad; | |
dd2155a4 DM |
1385 | I32 ix; |
1386 | ||
7918f24d NC |
1387 | PERL_ARGS_ASSERT_DO_DUMP_PAD; |
1388 | ||
dd2155a4 DM |
1389 | if (!padlist) { |
1390 | return; | |
1391 | } | |
502c6561 NC |
1392 | pad_name = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 0, FALSE)); |
1393 | pad = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 1, FALSE)); | |
dd2155a4 DM |
1394 | pname = AvARRAY(pad_name); |
1395 | ppad = AvARRAY(pad); | |
1396 | Perl_dump_indent(aTHX_ level, file, | |
1397 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1398 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1399 | ); | |
1400 | ||
1401 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
e1ec3a88 | 1402 | const SV *namesv = pname[ix]; |
dd2155a4 | 1403 | if (namesv && namesv == &PL_sv_undef) { |
a0714e2c | 1404 | namesv = NULL; |
dd2155a4 DM |
1405 | } |
1406 | if (namesv) { | |
ee6cee0c DM |
1407 | if (SvFAKE(namesv)) |
1408 | Perl_dump_indent(aTHX_ level+1, file, | |
c0fd1b42 | 1409 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c DM |
1410 | (int) ix, |
1411 | PTR2UV(ppad[ix]), | |
1412 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
b15aece3 | 1413 | SvPVX_const(namesv), |
809abb02 NC |
1414 | (unsigned long)PARENT_FAKELEX_FLAGS(namesv), |
1415 | (unsigned long)PARENT_PAD_INDEX(namesv) | |
b5c19bd7 | 1416 | |
ee6cee0c DM |
1417 | ); |
1418 | else | |
1419 | Perl_dump_indent(aTHX_ level+1, file, | |
809abb02 | 1420 | "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n", |
ee6cee0c DM |
1421 | (int) ix, |
1422 | PTR2UV(ppad[ix]), | |
1423 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
809abb02 NC |
1424 | (unsigned long)COP_SEQ_RANGE_LOW(namesv), |
1425 | (unsigned long)COP_SEQ_RANGE_HIGH(namesv), | |
b15aece3 | 1426 | SvPVX_const(namesv) |
ee6cee0c | 1427 | ); |
dd2155a4 DM |
1428 | } |
1429 | else if (full) { | |
1430 | Perl_dump_indent(aTHX_ level+1, file, | |
1431 | "%2d. 0x%"UVxf"<%lu>\n", | |
1432 | (int) ix, | |
1433 | PTR2UV(ppad[ix]), | |
1434 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1435 | ); | |
1436 | } | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | ||
1441 | ||
1442 | /* | |
1443 | =for apidoc cv_dump | |
1444 | ||
1445 | dump the contents of a CV | |
1446 | ||
1447 | =cut | |
1448 | */ | |
1449 | ||
1450 | #ifdef DEBUGGING | |
1451 | STATIC void | |
e1ec3a88 | 1452 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 | 1453 | { |
97aff369 | 1454 | dVAR; |
53c1dcc0 AL |
1455 | const CV * const outside = CvOUTSIDE(cv); |
1456 | AV* const padlist = CvPADLIST(cv); | |
dd2155a4 | 1457 | |
7918f24d NC |
1458 | PERL_ARGS_ASSERT_CV_DUMP; |
1459 | ||
dd2155a4 DM |
1460 | PerlIO_printf(Perl_debug_log, |
1461 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1462 | title, | |
1463 | PTR2UV(cv), | |
1464 | (CvANON(cv) ? "ANON" | |
71f882da | 1465 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 DM |
1466 | : (cv == PL_main_cv) ? "MAIN" |
1467 | : CvUNIQUE(cv) ? "UNIQUE" | |
1468 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1469 | PTR2UV(outside), | |
1470 | (!outside ? "null" | |
1471 | : CvANON(outside) ? "ANON" | |
1472 | : (outside == PL_main_cv) ? "MAIN" | |
1473 | : CvUNIQUE(outside) ? "UNIQUE" | |
1474 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1475 | ||
1476 | PerlIO_printf(Perl_debug_log, | |
1477 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1478 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1479 | } | |
1480 | #endif /* DEBUGGING */ | |
1481 | ||
1482 | ||
1483 | ||
1484 | ||
1485 | ||
1486 | /* | |
1487 | =for apidoc cv_clone | |
1488 | ||
1489 | Clone a CV: make a new CV which points to the same code etc, but which | |
1490 | has a newly-created pad built by copying the prototype pad and capturing | |
1491 | any outer lexicals. | |
1492 | ||
1493 | =cut | |
1494 | */ | |
1495 | ||
1496 | CV * | |
1497 | Perl_cv_clone(pTHX_ CV *proto) | |
1498 | { | |
27da23d5 | 1499 | dVAR; |
dd2155a4 | 1500 | I32 ix; |
53c1dcc0 | 1501 | AV* const protopadlist = CvPADLIST(proto); |
502c6561 NC |
1502 | const AV *const protopad_name = (const AV *)*av_fetch(protopadlist, 0, FALSE); |
1503 | const AV *const protopad = (const AV *)*av_fetch(protopadlist, 1, FALSE); | |
53c1dcc0 AL |
1504 | SV** const pname = AvARRAY(protopad_name); |
1505 | SV** const ppad = AvARRAY(protopad); | |
e1ec3a88 AL |
1506 | const I32 fname = AvFILLp(protopad_name); |
1507 | const I32 fpad = AvFILLp(protopad); | |
dd2155a4 | 1508 | CV* cv; |
b5c19bd7 DM |
1509 | SV** outpad; |
1510 | CV* outside; | |
71f882da | 1511 | long depth; |
dd2155a4 | 1512 | |
7918f24d NC |
1513 | PERL_ARGS_ASSERT_CV_CLONE; |
1514 | ||
dd2155a4 DM |
1515 | assert(!CvUNIQUE(proto)); |
1516 | ||
71f882da DM |
1517 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1518 | * to a prototype; we instead want the cloned parent who called us. | |
1519 | * Note that in general for formats, CvOUTSIDE != find_runcv */ | |
1520 | ||
1521 | outside = CvOUTSIDE(proto); | |
1522 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) | |
1523 | outside = find_runcv(NULL); | |
1524 | depth = CvDEPTH(outside); | |
1525 | assert(depth || SvTYPE(proto) == SVt_PVFM); | |
1526 | if (!depth) | |
1527 | depth = 1; | |
b5c19bd7 DM |
1528 | assert(CvPADLIST(outside)); |
1529 | ||
dd2155a4 DM |
1530 | ENTER; |
1531 | SAVESPTR(PL_compcv); | |
1532 | ||
ea726b52 | 1533 | cv = PL_compcv = MUTABLE_CV(newSV_type(SvTYPE(proto))); |
7dafbf52 | 1534 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 DM |
1535 | CvCLONED_on(cv); |
1536 | ||
dd2155a4 | 1537 | #ifdef USE_ITHREADS |
aed2304a NC |
1538 | CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto) |
1539 | : savepv(CvFILE(proto)); | |
dd2155a4 DM |
1540 | #else |
1541 | CvFILE(cv) = CvFILE(proto); | |
1542 | #endif | |
1543 | CvGV(cv) = CvGV(proto); | |
1544 | CvSTASH(cv) = CvSTASH(proto); | |
b34c0dd4 | 1545 | OP_REFCNT_LOCK; |
dd2155a4 | 1546 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 | 1547 | OP_REFCNT_UNLOCK; |
dd2155a4 | 1548 | CvSTART(cv) = CvSTART(proto); |
ea726b52 | 1549 | CvOUTSIDE(cv) = MUTABLE_CV(SvREFCNT_inc_simple(outside)); |
b5c19bd7 | 1550 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
dd2155a4 DM |
1551 | |
1552 | if (SvPOK(proto)) | |
ad64d0ec | 1553 | sv_setpvn(MUTABLE_SV(cv), SvPVX_const(proto), SvCUR(proto)); |
dd2155a4 | 1554 | |
b7787f18 | 1555 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
dd2155a4 | 1556 | |
b5c19bd7 | 1557 | av_fill(PL_comppad, fpad); |
dd2155a4 DM |
1558 | for (ix = fname; ix >= 0; ix--) |
1559 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1560 | ||
dd2155a4 DM |
1561 | PL_curpad = AvARRAY(PL_comppad); |
1562 | ||
71f882da | 1563 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 | 1564 | |
dd2155a4 | 1565 | for (ix = fpad; ix > 0; ix--) { |
a0714e2c SS |
1566 | SV* const namesv = (ix <= fname) ? pname[ix] : NULL; |
1567 | SV *sv = NULL; | |
71f882da | 1568 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
b5c19bd7 | 1569 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
809abb02 | 1570 | sv = outpad[PARENT_PAD_INDEX(namesv)]; |
71f882da | 1571 | assert(sv); |
33894c1a DM |
1572 | /* formats may have an inactive parent, |
1573 | while my $x if $false can leave an active var marked as | |
d1186544 DM |
1574 | stale. And state vars are always available */ |
1575 | if (SvPADSTALE(sv) && !SvPAD_STATE(namesv)) { | |
a2a5de95 NC |
1576 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
1577 | "Variable \"%s\" is not available", SvPVX_const(namesv)); | |
a0714e2c | 1578 | sv = NULL; |
71f882da | 1579 | } |
33894c1a | 1580 | else |
f84c484e | 1581 | SvREFCNT_inc_simple_void_NN(sv); |
dd2155a4 | 1582 | } |
71f882da | 1583 | if (!sv) { |
b15aece3 | 1584 | const char sigil = SvPVX_const(namesv)[0]; |
e1ec3a88 | 1585 | if (sigil == '&') |
dd2155a4 | 1586 | sv = SvREFCNT_inc(ppad[ix]); |
e1ec3a88 | 1587 | else if (sigil == '@') |
ad64d0ec | 1588 | sv = MUTABLE_SV(newAV()); |
e1ec3a88 | 1589 | else if (sigil == '%') |
ad64d0ec | 1590 | sv = MUTABLE_SV(newHV()); |
dd2155a4 | 1591 | else |
561b68a9 | 1592 | sv = newSV(0); |
235cc2e3 | 1593 | SvPADMY_on(sv); |
0d3b281c DM |
1594 | /* reset the 'assign only once' flag on each state var */ |
1595 | if (SvPAD_STATE(namesv)) | |
1596 | SvPADSTALE_on(sv); | |
dd2155a4 DM |
1597 | } |
1598 | } | |
1599 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
f84c484e | 1600 | sv = SvREFCNT_inc_NN(ppad[ix]); |
dd2155a4 DM |
1601 | } |
1602 | else { | |
561b68a9 | 1603 | sv = newSV(0); |
dd2155a4 | 1604 | SvPADTMP_on(sv); |
dd2155a4 | 1605 | } |
71f882da | 1606 | PL_curpad[ix] = sv; |
dd2155a4 DM |
1607 | } |
1608 | ||
dd2155a4 DM |
1609 | DEBUG_Xv( |
1610 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1611 | cv_dump(outside, "Outside"); | |
1612 | cv_dump(proto, "Proto"); | |
1613 | cv_dump(cv, "To"); | |
1614 | ); | |
1615 | ||
1616 | LEAVE; | |
1617 | ||
1618 | if (CvCONST(cv)) { | |
b5c19bd7 DM |
1619 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1620 | * The prototype was marked as a candiate for const-ization, | |
1621 | * so try to grab the current const value, and if successful, | |
1622 | * turn into a const sub: | |
1623 | */ | |
551405c4 | 1624 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 DM |
1625 | if (const_sv) { |
1626 | SvREFCNT_dec(cv); | |
bd61b366 | 1627 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); |
b5c19bd7 DM |
1628 | } |
1629 | else { | |
1630 | CvCONST_off(cv); | |
1631 | } | |
dd2155a4 DM |
1632 | } |
1633 | ||
1634 | return cv; | |
1635 | } | |
1636 | ||
1637 | ||
1638 | /* | |
1639 | =for apidoc pad_fixup_inner_anons | |
1640 | ||
1641 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1642 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1643 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1644 | |
1645 | =cut | |
1646 | */ | |
1647 | ||
1648 | void | |
1649 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1650 | { | |
97aff369 | 1651 | dVAR; |
dd2155a4 | 1652 | I32 ix; |
502c6561 NC |
1653 | AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
1654 | AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]); | |
53c1dcc0 AL |
1655 | SV ** const namepad = AvARRAY(comppad_name); |
1656 | SV ** const curpad = AvARRAY(comppad); | |
7918f24d NC |
1657 | |
1658 | PERL_ARGS_ASSERT_PAD_FIXUP_INNER_ANONS; | |
294a48e9 AL |
1659 | PERL_UNUSED_ARG(old_cv); |
1660 | ||
dd2155a4 | 1661 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
551405c4 | 1662 | const SV * const namesv = namepad[ix]; |
dd2155a4 | 1663 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 1664 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 1665 | { |
ea726b52 | 1666 | CV * const innercv = MUTABLE_CV(curpad[ix]); |
7dafbf52 DM |
1667 | assert(CvWEAKOUTSIDE(innercv)); |
1668 | assert(CvOUTSIDE(innercv) == old_cv); | |
1669 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1670 | } |
1671 | } | |
1672 | } | |
1673 | ||
7dafbf52 | 1674 | |
dd2155a4 DM |
1675 | /* |
1676 | =for apidoc pad_push | |
1677 | ||
1678 | Push a new pad frame onto the padlist, unless there's already a pad at | |
26019298 AL |
1679 | this depth, in which case don't bother creating a new one. Then give |
1680 | the new pad an @_ in slot zero. | |
dd2155a4 DM |
1681 | |
1682 | =cut | |
1683 | */ | |
1684 | ||
1685 | void | |
26019298 | 1686 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 | 1687 | { |
97aff369 | 1688 | dVAR; |
7918f24d NC |
1689 | |
1690 | PERL_ARGS_ASSERT_PAD_PUSH; | |
1691 | ||
b37c2d43 | 1692 | if (depth > AvFILLp(padlist)) { |
44f8325f AL |
1693 | SV** const svp = AvARRAY(padlist); |
1694 | AV* const newpad = newAV(); | |
1695 | SV** const oldpad = AvARRAY(svp[depth-1]); | |
502c6561 NC |
1696 | I32 ix = AvFILLp((const AV *)svp[1]); |
1697 | const I32 names_fill = AvFILLp((const AV *)svp[0]); | |
44f8325f | 1698 | SV** const names = AvARRAY(svp[0]); |
26019298 AL |
1699 | AV *av; |
1700 | ||
dd2155a4 DM |
1701 | for ( ;ix > 0; ix--) { |
1702 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
b15aece3 | 1703 | const char sigil = SvPVX_const(names[ix])[0]; |
fda94784 RGS |
1704 | if ((SvFLAGS(names[ix]) & SVf_FAKE) |
1705 | || (SvFLAGS(names[ix]) & SVpad_STATE) | |
1706 | || sigil == '&') | |
1707 | { | |
dd2155a4 DM |
1708 | /* outer lexical or anon code */ |
1709 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1710 | } | |
1711 | else { /* our own lexical */ | |
26019298 AL |
1712 | SV *sv; |
1713 | if (sigil == '@') | |
ad64d0ec | 1714 | sv = MUTABLE_SV(newAV()); |
26019298 | 1715 | else if (sigil == '%') |
ad64d0ec | 1716 | sv = MUTABLE_SV(newHV()); |
dd2155a4 | 1717 | else |
561b68a9 | 1718 | sv = newSV(0); |
26019298 | 1719 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1720 | SvPADMY_on(sv); |
1721 | } | |
1722 | } | |
1723 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
f84c484e | 1724 | av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix])); |
dd2155a4 DM |
1725 | } |
1726 | else { | |
1727 | /* save temporaries on recursion? */ | |
561b68a9 | 1728 | SV * const sv = newSV(0); |
26019298 | 1729 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1730 | SvPADTMP_on(sv); |
1731 | } | |
1732 | } | |
26019298 AL |
1733 | av = newAV(); |
1734 | av_extend(av, 0); | |
ad64d0ec | 1735 | av_store(newpad, 0, MUTABLE_SV(av)); |
11ca45c0 | 1736 | AvREIFY_only(av); |
26019298 | 1737 | |
ad64d0ec | 1738 | av_store(padlist, depth, MUTABLE_SV(newpad)); |
dd2155a4 DM |
1739 | AvFILLp(padlist) = depth; |
1740 | } | |
1741 | } | |
b21dc031 AL |
1742 | |
1743 | ||
1744 | HV * | |
1745 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) | |
1746 | { | |
97aff369 | 1747 | dVAR; |
551405c4 | 1748 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
00b1698f | 1749 | if ( SvPAD_TYPED(*av) ) { |
b21dc031 AL |
1750 | return SvSTASH(*av); |
1751 | } | |
5c284bb0 | 1752 | return NULL; |
b21dc031 | 1753 | } |
66610fdd RGS |
1754 | |
1755 | /* | |
1756 | * Local variables: | |
1757 | * c-indentation-style: bsd | |
1758 | * c-basic-offset: 4 | |
1759 | * indent-tabs-mode: t | |
1760 | * End: | |
1761 | * | |
37442d52 RGS |
1762 | * ex: set ts=8 sts=4 sw=4 noet: |
1763 | */ |