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1 | /* pad.c |
2 | * |
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3 | * Copyright (C) 2002, 2003, 2004, by Larry Wall and others |
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4 | * |
5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
7 | * |
8 | * "Anyway: there was this Mr Frodo left an orphan and stranded, as you |
9 | * might say, among those queer Bucklanders, being brought up anyhow in |
10 | * Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc |
11 | * never had fewer than a couple of hundred relations in the place. Mr |
12 | * Bilbo never did a kinder deed than when he brought the lad back to |
13 | * live among decent folk." --the Gaffer |
14 | */ |
15 | |
16 | /* XXX DAPM |
17 | * As of Sept 2002, this file is new and may be in a state of flux for |
18 | * a while. I've marked things I intent to come back and look at further |
19 | * with an 'XXX DAPM' comment. |
20 | */ |
21 | |
22 | /* |
23 | =head1 Pad Data Structures |
24 | |
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25 | This file contains the functions that create and manipulate scratchpads, |
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26 | which are array-of-array data structures attached to a CV (ie a sub) |
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27 | and which store lexical variables and opcode temporary and per-thread |
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28 | values. |
29 | |
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30 | =for apidoc m|AV *|CvPADLIST|CV *cv |
31 | CV's can have CvPADLIST(cv) set to point to an AV. |
32 | |
33 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're |
34 | not callable at will and are always thrown away after the eval"" is done |
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35 | executing). Require'd files are simply evals without any outer lexical |
36 | scope. |
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37 | |
38 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, |
39 | but that is really the callers pad (a slot of which is allocated by |
40 | every entersub). |
41 | |
42 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items |
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43 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
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44 | The items in the AV are not SVs as for a normal AV, but other AVs: |
45 | |
46 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather |
47 | the "static type information" for lexicals. |
48 | |
49 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that |
50 | depth of recursion into the CV. |
51 | The 0'th slot of a frame AV is an AV which is @_. |
52 | other entries are storage for variables and op targets. |
53 | |
54 | During compilation: |
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55 | C<PL_comppad_name> is set to the names AV. |
56 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. |
57 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). |
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58 | |
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59 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
60 | frame of the currently executing sub. |
61 | |
62 | Iterating over the names AV iterates over all possible pad |
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63 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
64 | &PL_sv_undef "names" (see pad_alloc()). |
65 | |
66 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. |
67 | The rest are op targets/GVs/constants which are statically allocated |
68 | or resolved at compile time. These don't have names by which they |
69 | can be looked up from Perl code at run time through eval"" like |
70 | my/our variables can be. Since they can't be looked up by "name" |
71 | but only by their index allocated at compile time (which is usually |
72 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. |
73 | |
74 | The SVs in the names AV have their PV being the name of the variable. |
75 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is |
76 | valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the |
77 | type. For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the |
78 | stash of the associated global (so that duplicate C<our> delarations in the |
79 | same package can be detected). SvCUR is sometimes hijacked to |
80 | store the generation number during compilation. |
81 | |
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82 | If SvFAKE is set on the name SV, then that slot in the frame AV is |
83 | a REFCNT'ed reference to a lexical from "outside". In this case, |
84 | the name SV does not use NVX and IVX to store a cop_seq range, since it is |
85 | in scope throughout. Instead IVX stores some flags containing info about |
86 | the real lexical (is it declared in an anon, and is it capable of being |
87 | instantiated multiple times?), and for fake ANONs, NVX contains the index |
88 | within the parent's pad where the lexical's value is stored, to make |
89 | cloning quicker. |
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90 | |
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91 | If the 'name' is '&' the corresponding entry in frame AV |
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92 | is a CV representing a possible closure. |
93 | (SvFAKE and name of '&' is not a meaningful combination currently but could |
94 | become so if C<my sub foo {}> is implemented.) |
95 | |
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96 | Note that formats are treated as anon subs, and are cloned each time |
97 | write is called (if necessary). |
98 | |
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99 | The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed, |
100 | and set on scope exit. This allows the 'Variable $x is not available' warning |
101 | to be generated in evals, such as |
102 | |
103 | { my $x = 1; sub f { eval '$x'} } f(); |
104 | |
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105 | =cut |
106 | */ |
107 | |
108 | |
109 | #include "EXTERN.h" |
110 | #define PERL_IN_PAD_C |
111 | #include "perl.h" |
112 | |
113 | |
114 | #define PAD_MAX 999999999 |
115 | |
116 | |
117 | |
118 | /* |
119 | =for apidoc pad_new |
120 | |
121 | Create a new compiling padlist, saving and updating the various global |
122 | vars at the same time as creating the pad itself. The following flags |
123 | can be OR'ed together: |
124 | |
125 | padnew_CLONE this pad is for a cloned CV |
126 | padnew_SAVE save old globals |
127 | padnew_SAVESUB also save extra stuff for start of sub |
128 | |
129 | =cut |
130 | */ |
131 | |
132 | PADLIST * |
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133 | Perl_pad_new(pTHX_ int flags) |
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134 | { |
135 | AV *padlist, *padname, *pad, *a0; |
136 | |
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137 | ASSERT_CURPAD_LEGAL("pad_new"); |
138 | |
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139 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
140 | * vars (based on flags) rather than storing vals + addresses for |
141 | * each individually. Also see pad_block_start. |
142 | * XXX DAPM Try to see whether all these conditionals are required |
143 | */ |
144 | |
145 | /* save existing state, ... */ |
146 | |
147 | if (flags & padnew_SAVE) { |
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148 | SAVECOMPPAD(); |
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149 | SAVESPTR(PL_comppad_name); |
150 | if (! (flags & padnew_CLONE)) { |
151 | SAVEI32(PL_padix); |
152 | SAVEI32(PL_comppad_name_fill); |
153 | SAVEI32(PL_min_intro_pending); |
154 | SAVEI32(PL_max_intro_pending); |
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155 | SAVEI32(PL_cv_has_eval); |
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156 | if (flags & padnew_SAVESUB) { |
157 | SAVEI32(PL_pad_reset_pending); |
158 | } |
159 | } |
160 | } |
161 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be |
162 | * saved - check at some pt that this is okay */ |
163 | |
164 | /* ... create new pad ... */ |
165 | |
166 | padlist = newAV(); |
167 | padname = newAV(); |
168 | pad = newAV(); |
169 | |
170 | if (flags & padnew_CLONE) { |
171 | /* XXX DAPM I dont know why cv_clone needs it |
172 | * doing differently yet - perhaps this separate branch can be |
173 | * dispensed with eventually ??? |
174 | */ |
175 | |
176 | a0 = newAV(); /* will be @_ */ |
177 | av_extend(a0, 0); |
178 | av_store(pad, 0, (SV*)a0); |
179 | AvFLAGS(a0) = AVf_REIFY; |
180 | } |
181 | else { |
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182 | av_store(pad, 0, Nullsv); |
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183 | } |
184 | |
185 | AvREAL_off(padlist); |
186 | av_store(padlist, 0, (SV*)padname); |
187 | av_store(padlist, 1, (SV*)pad); |
188 | |
189 | /* ... then update state variables */ |
190 | |
191 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); |
192 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); |
193 | PL_curpad = AvARRAY(PL_comppad); |
194 | |
195 | if (! (flags & padnew_CLONE)) { |
196 | PL_comppad_name_fill = 0; |
197 | PL_min_intro_pending = 0; |
198 | PL_padix = 0; |
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199 | PL_cv_has_eval = 0; |
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200 | } |
201 | |
202 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
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203 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
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204 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
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205 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
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206 | PTR2UV(padname), (UV)flags |
207 | ) |
208 | ); |
209 | |
210 | return (PADLIST*)padlist; |
211 | } |
212 | |
213 | /* |
214 | =for apidoc pad_undef |
215 | |
216 | Free the padlist associated with a CV. |
217 | If parts of it happen to be current, we null the relevant |
218 | PL_*pad* global vars so that we don't have any dangling references left. |
219 | We also repoint the CvOUTSIDE of any about-to-be-orphaned |
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220 | inner subs to the outer of this cv. |
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221 | |
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222 | (This function should really be called pad_free, but the name was already |
223 | taken) |
224 | |
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225 | =cut |
226 | */ |
227 | |
228 | void |
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229 | Perl_pad_undef(pTHX_ CV* cv) |
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230 | { |
231 | I32 ix; |
232 | PADLIST *padlist = CvPADLIST(cv); |
233 | |
234 | if (!padlist) |
235 | return; |
236 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ |
237 | return; |
238 | |
239 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
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240 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", |
241 | PTR2UV(cv), PTR2UV(padlist)) |
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242 | ); |
243 | |
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244 | /* detach any '&' anon children in the pad; if afterwards they |
245 | * are still live, fix up their CvOUTSIDEs to point to our outside, |
246 | * bypassing us. */ |
247 | /* XXX DAPM for efficiency, we should only do this if we know we have |
248 | * children, or integrate this loop with general cleanup */ |
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249 | |
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250 | if (!PL_dirty) { /* don't bother during global destruction */ |
251 | CV *outercv = CvOUTSIDE(cv); |
252 | U32 seq = CvOUTSIDE_SEQ(cv); |
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253 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
254 | SV **namepad = AvARRAY(comppad_name); |
255 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
256 | SV **curpad = AvARRAY(comppad); |
257 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
258 | SV *namesv = namepad[ix]; |
259 | if (namesv && namesv != &PL_sv_undef |
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260 | && *SvPVX(namesv) == '&') |
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261 | { |
262 | CV *innercv = (CV*)curpad[ix]; |
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263 | namepad[ix] = Nullsv; |
264 | SvREFCNT_dec(namesv); |
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265 | |
266 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ |
267 | curpad[ix] = Nullsv; |
268 | SvREFCNT_dec(innercv); |
269 | } |
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270 | if (SvREFCNT(innercv) /* in use, not just a prototype */ |
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271 | && CvOUTSIDE(innercv) == cv) |
272 | { |
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273 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 |
274 | /* don't relink to grandfather if he's being freed */ |
275 | if (outercv && SvREFCNT(outercv)) { |
276 | CvWEAKOUTSIDE_off(innercv); |
277 | CvOUTSIDE(innercv) = outercv; |
278 | CvOUTSIDE_SEQ(innercv) = seq; |
279 | SvREFCNT_inc(outercv); |
280 | } |
281 | else { |
282 | CvOUTSIDE(innercv) = Nullcv; |
283 | } |
284 | |
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285 | } |
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286 | |
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287 | } |
288 | } |
289 | } |
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290 | |
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291 | ix = AvFILLp(padlist); |
292 | while (ix >= 0) { |
293 | SV* sv = AvARRAY(padlist)[ix--]; |
294 | if (!sv) |
295 | continue; |
296 | if (sv == (SV*)PL_comppad_name) |
297 | PL_comppad_name = Nullav; |
298 | else if (sv == (SV*)PL_comppad) { |
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299 | PL_comppad = Null(PAD*); |
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300 | PL_curpad = Null(SV**); |
301 | } |
302 | SvREFCNT_dec(sv); |
303 | } |
304 | SvREFCNT_dec((SV*)CvPADLIST(cv)); |
305 | CvPADLIST(cv) = Null(PADLIST*); |
306 | } |
307 | |
308 | |
309 | |
310 | |
311 | /* |
312 | =for apidoc pad_add_name |
313 | |
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314 | Create a new name and associated PADMY SV in the current pad; return the |
315 | offset. |
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316 | If C<typestash> is valid, the name is for a typed lexical; set the |
317 | name's stash to that value. |
318 | If C<ourstash> is valid, it's an our lexical, set the name's |
319 | GvSTASH to that value |
320 | |
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321 | If fake, it means we're cloning an existing entry |
322 | |
323 | =cut |
324 | */ |
325 | |
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326 | PADOFFSET |
327 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) |
328 | { |
329 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
330 | SV* namesv = NEWSV(1102, 0); |
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331 | |
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332 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
333 | |
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334 | |
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335 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); |
336 | sv_setpv(namesv, name); |
337 | |
338 | if (typestash) { |
339 | SvFLAGS(namesv) |= SVpad_TYPED; |
340 | SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); |
341 | } |
342 | if (ourstash) { |
343 | SvFLAGS(namesv) |= SVpad_OUR; |
344 | GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); |
345 | } |
346 | |
347 | av_store(PL_comppad_name, offset, namesv); |
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348 | if (fake) { |
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349 | SvFAKE_on(namesv); |
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350 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
351 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); |
352 | } |
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353 | else { |
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354 | /* not yet introduced */ |
355 | SvNVX(namesv) = (NV)PAD_MAX; /* min */ |
356 | SvIVX(namesv) = 0; /* max */ |
357 | |
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358 | if (!PL_min_intro_pending) |
359 | PL_min_intro_pending = offset; |
360 | PL_max_intro_pending = offset; |
b5c19bd7 |
361 | /* if it's not a simple scalar, replace with an AV or HV */ |
f3548bdc |
362 | /* XXX DAPM since slot has been allocated, replace |
363 | * av_store with PL_curpad[offset] ? */ |
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364 | if (*name == '@') |
365 | av_store(PL_comppad, offset, (SV*)newAV()); |
366 | else if (*name == '%') |
367 | av_store(PL_comppad, offset, (SV*)newHV()); |
368 | SvPADMY_on(PL_curpad[offset]); |
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369 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
370 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", |
371 | (long)offset, name, PTR2UV(PL_curpad[offset]))); |
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372 | } |
373 | |
374 | return offset; |
375 | } |
376 | |
377 | |
378 | |
379 | |
380 | /* |
381 | =for apidoc pad_alloc |
382 | |
383 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto |
384 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards |
385 | for a slot which has no name and and no active value. |
386 | |
387 | =cut |
388 | */ |
389 | |
390 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), |
391 | * or at least rationalise ??? */ |
392 | |
393 | |
394 | PADOFFSET |
395 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) |
396 | { |
397 | SV *sv; |
398 | I32 retval; |
399 | |
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400 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
401 | |
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402 | if (AvARRAY(PL_comppad) != PL_curpad) |
403 | Perl_croak(aTHX_ "panic: pad_alloc"); |
404 | if (PL_pad_reset_pending) |
405 | pad_reset(); |
406 | if (tmptype & SVs_PADMY) { |
235cc2e3 |
407 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
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408 | retval = AvFILLp(PL_comppad); |
409 | } |
410 | else { |
411 | SV **names = AvARRAY(PL_comppad_name); |
412 | SSize_t names_fill = AvFILLp(PL_comppad_name); |
413 | for (;;) { |
414 | /* |
415 | * "foreach" index vars temporarily become aliases to non-"my" |
416 | * values. Thus we must skip, not just pad values that are |
417 | * marked as current pad values, but also those with names. |
418 | */ |
419 | /* HVDS why copy to sv here? we don't seem to use it */ |
420 | if (++PL_padix <= names_fill && |
421 | (sv = names[PL_padix]) && sv != &PL_sv_undef) |
422 | continue; |
423 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); |
424 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && |
425 | !IS_PADGV(sv) && !IS_PADCONST(sv)) |
426 | break; |
427 | } |
428 | retval = PL_padix; |
429 | } |
430 | SvFLAGS(sv) |= tmptype; |
431 | PL_curpad = AvARRAY(PL_comppad); |
432 | |
433 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
434 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", |
435 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, |
436 | PL_op_name[optype])); |
437 | return (PADOFFSET)retval; |
438 | } |
439 | |
440 | /* |
441 | =for apidoc pad_add_anon |
442 | |
443 | Add an anon code entry to the current compiling pad |
444 | |
445 | =cut |
446 | */ |
447 | |
448 | PADOFFSET |
449 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) |
450 | { |
451 | PADOFFSET ix; |
452 | SV* name; |
453 | |
454 | name = NEWSV(1106, 0); |
455 | sv_upgrade(name, SVt_PVNV); |
456 | sv_setpvn(name, "&", 1); |
457 | SvIVX(name) = -1; |
458 | SvNVX(name) = 1; |
459 | ix = pad_alloc(op_type, SVs_PADMY); |
460 | av_store(PL_comppad_name, ix, name); |
f3548bdc |
461 | /* XXX DAPM use PL_curpad[] ? */ |
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462 | av_store(PL_comppad, ix, sv); |
463 | SvPADMY_on(sv); |
7dafbf52 |
464 | |
465 | /* to avoid ref loops, we never have parent + child referencing each |
466 | * other simultaneously */ |
467 | if (CvOUTSIDE((CV*)sv)) { |
468 | assert(!CvWEAKOUTSIDE((CV*)sv)); |
469 | CvWEAKOUTSIDE_on((CV*)sv); |
470 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); |
471 | } |
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472 | return ix; |
473 | } |
474 | |
475 | |
476 | |
477 | /* |
478 | =for apidoc pad_check_dup |
479 | |
480 | Check for duplicate declarations: report any of: |
481 | * a my in the current scope with the same name; |
482 | * an our (anywhere in the pad) with the same name and the same stash |
483 | as C<ourstash> |
484 | C<is_our> indicates that the name to check is an 'our' declaration |
485 | |
486 | =cut |
487 | */ |
488 | |
489 | /* XXX DAPM integrate this into pad_add_name ??? */ |
490 | |
491 | void |
492 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) |
493 | { |
494 | SV **svp, *sv; |
495 | PADOFFSET top, off; |
496 | |
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497 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
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498 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
499 | return; /* nothing to check */ |
500 | |
501 | svp = AvARRAY(PL_comppad_name); |
502 | top = AvFILLp(PL_comppad_name); |
503 | /* check the current scope */ |
504 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
505 | * type ? */ |
506 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
507 | if ((sv = svp[off]) |
508 | && sv != &PL_sv_undef |
ee6cee0c |
509 | && !SvFAKE(sv) |
dd2155a4 |
510 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
511 | && (!is_our |
512 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) |
513 | && strEQ(name, SvPVX(sv))) |
514 | { |
515 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
516 | "\"%s\" variable %s masks earlier declaration in same %s", |
517 | (is_our ? "our" : "my"), |
518 | name, |
519 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); |
520 | --off; |
521 | break; |
522 | } |
523 | } |
524 | /* check the rest of the pad */ |
525 | if (is_our) { |
526 | do { |
527 | if ((sv = svp[off]) |
528 | && sv != &PL_sv_undef |
ee6cee0c |
529 | && !SvFAKE(sv) |
dd2155a4 |
530 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
531 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) |
532 | && strEQ(name, SvPVX(sv))) |
533 | { |
534 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
535 | "\"our\" variable %s redeclared", name); |
536 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
537 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
538 | break; |
539 | } |
540 | } while ( off-- > 0 ); |
541 | } |
542 | } |
543 | |
544 | |
dd2155a4 |
545 | /* |
546 | =for apidoc pad_findmy |
547 | |
548 | Given a lexical name, try to find its offset, first in the current pad, |
549 | or failing that, in the pads of any lexically enclosing subs (including |
550 | the complications introduced by eval). If the name is found in an outer pad, |
551 | then a fake entry is added to the current pad. |
552 | Returns the offset in the current pad, or NOT_IN_PAD on failure. |
553 | |
554 | =cut |
555 | */ |
556 | |
557 | PADOFFSET |
558 | Perl_pad_findmy(pTHX_ char *name) |
559 | { |
b5c19bd7 |
560 | SV *out_sv; |
561 | int out_flags; |
929a0744 |
562 | I32 offset; |
563 | AV *nameav; |
564 | SV **name_svp; |
dd2155a4 |
565 | |
929a0744 |
566 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
b5c19bd7 |
567 | Null(SV**), &out_sv, &out_flags); |
929a0744 |
568 | if (offset != NOT_IN_PAD) |
569 | return offset; |
570 | |
571 | /* look for an our that's being introduced; this allows |
572 | * our $foo = 0 unless defined $foo; |
573 | * to not give a warning. (Yes, this is a hack) */ |
574 | |
575 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; |
576 | name_svp = AvARRAY(nameav); |
577 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
578 | SV *namesv = name_svp[offset]; |
579 | if (namesv && namesv != &PL_sv_undef |
580 | && !SvFAKE(namesv) |
581 | && (SvFLAGS(namesv) & SVpad_OUR) |
582 | && strEQ(SvPVX(namesv), name) |
4cf4a199 |
583 | && U_32(SvNVX(namesv)) == PAD_MAX /* min */ |
929a0744 |
584 | ) |
585 | return offset; |
586 | } |
587 | return NOT_IN_PAD; |
dd2155a4 |
588 | } |
589 | |
e1f795dc |
590 | /* |
591 | * Returns the offset of a lexical $_, if there is one, at run time. |
592 | * Used by the UNDERBAR XS macro. |
593 | */ |
594 | |
595 | PADOFFSET |
29289021 |
596 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc |
597 | { |
598 | SV *out_sv; |
599 | int out_flags; |
600 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, |
601 | Null(SV**), &out_sv, &out_flags); |
602 | } |
dd2155a4 |
603 | |
dd2155a4 |
604 | /* |
605 | =for apidoc pad_findlex |
606 | |
607 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
b5c19bd7 |
608 | in the inner pads if it's found in an outer one. |
609 | |
610 | Returns the offset in the bottom pad of the lex or the fake lex. |
611 | cv is the CV in which to start the search, and seq is the current cop_seq |
612 | to match against. If warn is true, print appropriate warnings. The out_* |
613 | vars return values, and so are pointers to where the returned values |
614 | should be stored. out_capture, if non-null, requests that the innermost |
615 | instance of the lexical is captured; out_name_sv is set to the innermost |
616 | matched namesv or fake namesv; out_flags returns the flags normally |
617 | associated with the IVX field of a fake namesv. |
618 | |
619 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, |
620 | then comes back down, adding fake entries as it goes. It has to be this way |
621 | because fake namesvs in anon protoypes have to store in NVX the index into |
622 | the parent pad. |
dd2155a4 |
623 | |
624 | =cut |
625 | */ |
626 | |
b5c19bd7 |
627 | /* Flags set in the SvIVX field of FAKE namesvs */ |
628 | |
629 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ |
630 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ |
631 | |
632 | /* the CV has finished being compiled. This is not a sufficient test for |
633 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ |
634 | #define CvCOMPILED(cv) CvROOT(cv) |
635 | |
71f882da |
636 | /* the CV does late binding of its lexicals */ |
637 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) |
638 | |
b5c19bd7 |
639 | |
dd2155a4 |
640 | STATIC PADOFFSET |
b5c19bd7 |
641 | S_pad_findlex(pTHX_ char *name, CV* cv, U32 seq, int warn, |
642 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 |
643 | { |
b5c19bd7 |
644 | I32 offset, new_offset; |
645 | SV *new_capture; |
646 | SV **new_capturep; |
647 | AV *padlist = CvPADLIST(cv); |
dd2155a4 |
648 | |
b5c19bd7 |
649 | *out_flags = 0; |
a3985cdc |
650 | |
b5c19bd7 |
651 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
652 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", |
653 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); |
dd2155a4 |
654 | |
b5c19bd7 |
655 | /* first, search this pad */ |
dd2155a4 |
656 | |
b5c19bd7 |
657 | if (padlist) { /* not an undef CV */ |
658 | I32 fake_offset = 0; |
659 | AV *nameav = (AV*)AvARRAY(padlist)[0]; |
660 | SV **name_svp = AvARRAY(nameav); |
ee6cee0c |
661 | |
b5c19bd7 |
662 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
663 | SV *namesv = name_svp[offset]; |
664 | if (namesv && namesv != &PL_sv_undef |
665 | && strEQ(SvPVX(namesv), name)) |
666 | { |
667 | if (SvFAKE(namesv)) |
668 | fake_offset = offset; /* in case we don't find a real one */ |
4cf4a199 |
669 | else if ( seq > U_32(SvNVX(namesv)) /* min */ |
670 | && seq <= (U32)SvIVX(namesv)) /* max */ |
b5c19bd7 |
671 | break; |
ee6cee0c |
672 | } |
673 | } |
674 | |
b5c19bd7 |
675 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
676 | if (offset > 0) { /* not fake */ |
677 | fake_offset = 0; |
678 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
679 | |
680 | /* set PAD_FAKELEX_MULTI if this lex can have multiple |
681 | * instances. For now, we just test !CvUNIQUE(cv), but |
682 | * ideally, we should detect my's declared within loops |
683 | * etc - this would allow a wider range of 'not stayed |
684 | * shared' warnings. We also treated alreadly-compiled |
685 | * lexes as not multi as viewed from evals. */ |
686 | |
687 | *out_flags = CvANON(cv) ? |
688 | PAD_FAKELEX_ANON : |
689 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) |
690 | ? PAD_FAKELEX_MULTI : 0; |
691 | |
692 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
693 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", |
4cf4a199 |
694 | PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), |
b5c19bd7 |
695 | (long)SvIVX(*out_name_sv))); |
696 | } |
697 | else { /* fake match */ |
698 | offset = fake_offset; |
699 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
700 | *out_flags = SvIVX(*out_name_sv); |
701 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
19a5c512 |
702 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 |
703 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
704 | (unsigned long)SvNVX(*out_name_sv) |
705 | )); |
706 | } |
dd2155a4 |
707 | |
b5c19bd7 |
708 | /* return the lex? */ |
dd2155a4 |
709 | |
b5c19bd7 |
710 | if (out_capture) { |
dd2155a4 |
711 | |
b5c19bd7 |
712 | /* our ? */ |
713 | if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) { |
714 | *out_capture = Nullsv; |
715 | return offset; |
716 | } |
ee6cee0c |
717 | |
b5c19bd7 |
718 | /* trying to capture from an anon prototype? */ |
719 | if (CvCOMPILED(cv) |
720 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) |
721 | : *out_flags & PAD_FAKELEX_ANON) |
722 | { |
723 | if (warn && ckWARN(WARN_CLOSURE)) |
724 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
725 | "Variable \"%s\" is not available", name); |
726 | *out_capture = Nullsv; |
727 | } |
ee6cee0c |
728 | |
b5c19bd7 |
729 | /* real value */ |
730 | else { |
731 | int newwarn = warn; |
732 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) |
733 | && warn && ckWARN(WARN_CLOSURE)) { |
734 | newwarn = 0; |
735 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
736 | "Variable \"%s\" will not stay shared", name); |
737 | } |
dd2155a4 |
738 | |
b5c19bd7 |
739 | if (fake_offset && CvANON(cv) |
740 | && CvCLONE(cv) &&!CvCLONED(cv)) |
741 | { |
742 | SV *n; |
743 | /* not yet caught - look further up */ |
744 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
745 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", |
746 | PTR2UV(cv))); |
747 | n = *out_name_sv; |
748 | pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), |
749 | newwarn, out_capture, out_name_sv, out_flags); |
750 | *out_name_sv = n; |
751 | return offset; |
dd2155a4 |
752 | } |
b5c19bd7 |
753 | |
754 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ |
755 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; |
756 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
757 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", |
19a5c512 |
758 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 |
759 | |
760 | if (SvPADSTALE(*out_capture)) { |
761 | if (ckWARN(WARN_CLOSURE)) |
ee6cee0c |
762 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 |
763 | "Variable \"%s\" is not available", name); |
764 | *out_capture = Nullsv; |
dd2155a4 |
765 | } |
766 | } |
b5c19bd7 |
767 | if (!*out_capture) { |
768 | if (*name == '@') |
769 | *out_capture = sv_2mortal((SV*)newAV()); |
770 | else if (*name == '%') |
771 | *out_capture = sv_2mortal((SV*)newHV()); |
772 | else |
773 | *out_capture = sv_newmortal(); |
774 | } |
dd2155a4 |
775 | } |
b5c19bd7 |
776 | |
777 | return offset; |
ee6cee0c |
778 | } |
b5c19bd7 |
779 | } |
780 | |
781 | /* it's not in this pad - try above */ |
782 | |
783 | if (!CvOUTSIDE(cv)) |
784 | return NOT_IN_PAD; |
785 | |
786 | /* out_capture non-null means caller wants us to capture lex; in |
71f882da |
787 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 |
788 | new_capturep = out_capture ? out_capture : |
71f882da |
789 | CvLATE(cv) ? Null(SV**) : &new_capture; |
b5c19bd7 |
790 | |
791 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, |
792 | new_capturep, out_name_sv, out_flags); |
793 | if (offset == NOT_IN_PAD) |
794 | return NOT_IN_PAD; |
795 | |
796 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
797 | |
798 | /* don't add new fake entries (via eval) to CVs that we have already |
799 | * finished compiling, or to undef CVs */ |
800 | if (CvCOMPILED(cv) || !padlist) |
801 | return 0; /* this dummy (and invalid) value isnt used by the caller */ |
802 | |
803 | { |
804 | SV *new_namesv; |
805 | AV *ocomppad_name = PL_comppad_name; |
806 | PAD *ocomppad = PL_comppad; |
807 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
808 | PL_comppad = (AV*)AvARRAY(padlist)[1]; |
809 | PL_curpad = AvARRAY(PL_comppad); |
810 | |
811 | new_offset = pad_add_name( |
812 | SvPVX(*out_name_sv), |
813 | (SvFLAGS(*out_name_sv) & SVpad_TYPED) |
814 | ? SvSTASH(*out_name_sv) : Nullhv, |
815 | (SvFLAGS(*out_name_sv) & SVpad_OUR) |
816 | ? GvSTASH(*out_name_sv) : Nullhv, |
817 | 1 /* fake */ |
818 | ); |
819 | |
820 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; |
821 | SvIVX(new_namesv) = *out_flags; |
822 | |
823 | SvNVX(new_namesv) = (NV)0; |
824 | if (SvFLAGS(new_namesv) & SVpad_OUR) { |
825 | /* do nothing */ |
826 | } |
71f882da |
827 | else if (CvLATE(cv)) { |
b5c19bd7 |
828 | /* delayed creation - just note the offset within parent pad */ |
829 | SvNVX(new_namesv) = (NV)offset; |
830 | CvCLONE_on(cv); |
831 | } |
832 | else { |
833 | /* immediate creation - capture outer value right now */ |
834 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); |
835 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
836 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", |
837 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); |
dd2155a4 |
838 | } |
b5c19bd7 |
839 | *out_name_sv = new_namesv; |
840 | *out_flags = SvIVX(new_namesv); |
841 | |
842 | PL_comppad_name = ocomppad_name; |
843 | PL_comppad = ocomppad; |
844 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **); |
dd2155a4 |
845 | } |
b5c19bd7 |
846 | return new_offset; |
dd2155a4 |
847 | } |
848 | |
b5c19bd7 |
849 | |
dd2155a4 |
850 | /* |
851 | =for apidoc pad_sv |
852 | |
853 | Get the value at offset po in the current pad. |
854 | Use macro PAD_SV instead of calling this function directly. |
855 | |
856 | =cut |
857 | */ |
858 | |
859 | |
860 | SV * |
861 | Perl_pad_sv(pTHX_ PADOFFSET po) |
862 | { |
f3548bdc |
863 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 |
864 | |
dd2155a4 |
865 | if (!po) |
866 | Perl_croak(aTHX_ "panic: pad_sv po"); |
dd2155a4 |
867 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
868 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
869 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 |
870 | ); |
871 | return PL_curpad[po]; |
872 | } |
873 | |
874 | |
875 | /* |
876 | =for apidoc pad_setsv |
877 | |
878 | Set the entry at offset po in the current pad to sv. |
879 | Use the macro PAD_SETSV() rather than calling this function directly. |
880 | |
881 | =cut |
882 | */ |
883 | |
884 | #ifdef DEBUGGING |
885 | void |
886 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
887 | { |
f3548bdc |
888 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 |
889 | |
890 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
891 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
892 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 |
893 | ); |
894 | PL_curpad[po] = sv; |
895 | } |
896 | #endif |
897 | |
898 | |
899 | |
900 | /* |
901 | =for apidoc pad_block_start |
902 | |
903 | Update the pad compilation state variables on entry to a new block |
904 | |
905 | =cut |
906 | */ |
907 | |
908 | /* XXX DAPM perhaps: |
909 | * - integrate this in general state-saving routine ??? |
910 | * - combine with the state-saving going on in pad_new ??? |
911 | * - introduce a new SAVE type that does all this in one go ? |
912 | */ |
913 | |
914 | void |
915 | Perl_pad_block_start(pTHX_ int full) |
916 | { |
f3548bdc |
917 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 |
918 | SAVEI32(PL_comppad_name_floor); |
919 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
920 | if (full) |
921 | PL_comppad_name_fill = PL_comppad_name_floor; |
922 | if (PL_comppad_name_floor < 0) |
923 | PL_comppad_name_floor = 0; |
924 | SAVEI32(PL_min_intro_pending); |
925 | SAVEI32(PL_max_intro_pending); |
926 | PL_min_intro_pending = 0; |
927 | SAVEI32(PL_comppad_name_fill); |
928 | SAVEI32(PL_padix_floor); |
929 | PL_padix_floor = PL_padix; |
930 | PL_pad_reset_pending = FALSE; |
931 | } |
932 | |
933 | |
934 | /* |
935 | =for apidoc intro_my |
936 | |
937 | "Introduce" my variables to visible status. |
938 | |
939 | =cut |
940 | */ |
941 | |
942 | U32 |
943 | Perl_intro_my(pTHX) |
944 | { |
945 | SV **svp; |
946 | SV *sv; |
947 | I32 i; |
948 | |
f3548bdc |
949 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 |
950 | if (! PL_min_intro_pending) |
951 | return PL_cop_seqmax; |
952 | |
953 | svp = AvARRAY(PL_comppad_name); |
954 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
ee6cee0c |
955 | if ((sv = svp[i]) && sv != &PL_sv_undef |
956 | && !SvFAKE(sv) && !SvIVX(sv)) |
957 | { |
dd2155a4 |
958 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
959 | SvNVX(sv) = (NV)PL_cop_seqmax; |
960 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
961 | "Pad intromy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 |
962 | (long)i, SvPVX(sv), |
4cf4a199 |
963 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 |
964 | ); |
965 | } |
966 | } |
967 | PL_min_intro_pending = 0; |
968 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
969 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
970 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); |
971 | |
972 | return PL_cop_seqmax++; |
973 | } |
974 | |
975 | /* |
976 | =for apidoc pad_leavemy |
977 | |
978 | Cleanup at end of scope during compilation: set the max seq number for |
979 | lexicals in this scope and warn of any lexicals that never got introduced. |
980 | |
981 | =cut |
982 | */ |
983 | |
984 | void |
985 | Perl_pad_leavemy(pTHX) |
986 | { |
987 | I32 off; |
988 | SV **svp = AvARRAY(PL_comppad_name); |
989 | SV *sv; |
990 | |
991 | PL_pad_reset_pending = FALSE; |
992 | |
f3548bdc |
993 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 |
994 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
995 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
ee6cee0c |
996 | if ((sv = svp[off]) && sv != &PL_sv_undef |
997 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
dd2155a4 |
998 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
35c1215d |
999 | "%"SVf" never introduced", sv); |
dd2155a4 |
1000 | } |
1001 | } |
1002 | /* "Deintroduce" my variables that are leaving with this scope. */ |
1003 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
ee6cee0c |
1004 | if ((sv = svp[off]) && sv != &PL_sv_undef |
1005 | && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) |
1006 | { |
dd2155a4 |
1007 | SvIVX(sv) = PL_cop_seqmax; |
1008 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
1009 | "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 |
1010 | (long)off, SvPVX(sv), |
4cf4a199 |
1011 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 |
1012 | ); |
1013 | } |
1014 | } |
1015 | PL_cop_seqmax++; |
1016 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1017 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
1018 | } |
1019 | |
1020 | |
1021 | /* |
1022 | =for apidoc pad_swipe |
1023 | |
1024 | Abandon the tmp in the current pad at offset po and replace with a |
1025 | new one. |
1026 | |
1027 | =cut |
1028 | */ |
1029 | |
1030 | void |
1031 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
1032 | { |
f3548bdc |
1033 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 |
1034 | if (!PL_curpad) |
1035 | return; |
1036 | if (AvARRAY(PL_comppad) != PL_curpad) |
1037 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
1038 | if (!po) |
1039 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
1040 | |
1041 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1042 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
1043 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
1044 | |
1045 | if (PL_curpad[po]) |
1046 | SvPADTMP_off(PL_curpad[po]); |
1047 | if (refadjust) |
1048 | SvREFCNT_dec(PL_curpad[po]); |
1049 | |
1050 | PL_curpad[po] = NEWSV(1107,0); |
1051 | SvPADTMP_on(PL_curpad[po]); |
1052 | if ((I32)po < PL_padix) |
1053 | PL_padix = po - 1; |
1054 | } |
1055 | |
1056 | |
1057 | /* |
1058 | =for apidoc pad_reset |
1059 | |
1060 | Mark all the current temporaries for reuse |
1061 | |
1062 | =cut |
1063 | */ |
1064 | |
1065 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
1066 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
1067 | * on the stack by OPs that use them, there are several ways to get an alias |
1068 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
1069 | * We avoid doing this until we can think of a Better Way. |
1070 | * GSAR 97-10-29 */ |
1071 | void |
1072 | Perl_pad_reset(pTHX) |
1073 | { |
1074 | #ifdef USE_BROKEN_PAD_RESET |
1075 | register I32 po; |
1076 | |
1077 | if (AvARRAY(PL_comppad) != PL_curpad) |
1078 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
1079 | |
1080 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1081 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
1082 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
1083 | (long)PL_padix, (long)PL_padix_floor |
1084 | ) |
1085 | ); |
1086 | |
1087 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
1088 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1089 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
1090 | SvPADTMP_off(PL_curpad[po]); |
1091 | } |
1092 | PL_padix = PL_padix_floor; |
1093 | } |
1094 | #endif |
1095 | PL_pad_reset_pending = FALSE; |
1096 | } |
1097 | |
1098 | |
1099 | /* |
1100 | =for apidoc pad_tidy |
1101 | |
1102 | Tidy up a pad after we've finished compiling it: |
1103 | * remove most stuff from the pads of anonsub prototypes; |
1104 | * give it a @_; |
1105 | * mark tmps as such. |
1106 | |
1107 | =cut |
1108 | */ |
1109 | |
1110 | /* XXX DAPM surely most of this stuff should be done properly |
1111 | * at the right time beforehand, rather than going around afterwards |
1112 | * cleaning up our mistakes ??? |
1113 | */ |
1114 | |
1115 | void |
1116 | Perl_pad_tidy(pTHX_ padtidy_type type) |
1117 | { |
1118 | PADOFFSET ix; |
b5c19bd7 |
1119 | CV *cv; |
dd2155a4 |
1120 | |
f3548bdc |
1121 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 |
1122 | |
1123 | /* If this CV has had any 'eval-capable' ops planted in it |
1124 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any |
1125 | * anon prototypes in the chain of CVs should be marked as cloneable, |
1126 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets |
1127 | * the right CvOUTSIDE. |
1128 | * If running with -d, *any* sub may potentially have an eval |
1129 | * excuted within it. |
1130 | */ |
1131 | |
1132 | if (PL_cv_has_eval || PL_perldb) { |
1133 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1134 | if (cv != PL_compcv && CvCOMPILED(cv)) |
1135 | break; /* no need to mark already-compiled code */ |
1136 | if (CvANON(cv)) { |
1137 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1138 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); |
1139 | CvCLONE_on(cv); |
1140 | } |
1141 | } |
1142 | } |
1143 | |
dd2155a4 |
1144 | /* extend curpad to match namepad */ |
1145 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
1146 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); |
1147 | |
1148 | if (type == padtidy_SUBCLONE) { |
1149 | SV **namep = AvARRAY(PL_comppad_name); |
b5c19bd7 |
1150 | |
dd2155a4 |
1151 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1152 | SV *namesv; |
1153 | |
1154 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1155 | continue; |
1156 | /* |
1157 | * The only things that a clonable function needs in its |
b5c19bd7 |
1158 | * pad are anonymous subs. |
dd2155a4 |
1159 | * The rest are created anew during cloning. |
1160 | */ |
1161 | if (!((namesv = namep[ix]) != Nullsv && |
1162 | namesv != &PL_sv_undef && |
b5c19bd7 |
1163 | *SvPVX(namesv) == '&')) |
dd2155a4 |
1164 | { |
1165 | SvREFCNT_dec(PL_curpad[ix]); |
1166 | PL_curpad[ix] = Nullsv; |
1167 | } |
1168 | } |
1169 | } |
1170 | else if (type == padtidy_SUB) { |
1171 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
1172 | AV *av = newAV(); /* Will be @_ */ |
1173 | av_extend(av, 0); |
1174 | av_store(PL_comppad, 0, (SV*)av); |
1175 | AvFLAGS(av) = AVf_REIFY; |
1176 | } |
1177 | |
1178 | /* XXX DAPM rationalise these two similar branches */ |
1179 | |
1180 | if (type == padtidy_SUB) { |
1181 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1182 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1183 | continue; |
1184 | if (!SvPADMY(PL_curpad[ix])) |
1185 | SvPADTMP_on(PL_curpad[ix]); |
1186 | } |
1187 | } |
1188 | else if (type == padtidy_FORMAT) { |
1189 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1190 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) |
1191 | SvPADTMP_on(PL_curpad[ix]); |
1192 | } |
1193 | } |
f3548bdc |
1194 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 |
1195 | } |
1196 | |
1197 | |
1198 | /* |
1199 | =for apidoc pad_free |
1200 | |
1201 | Free the SV at offet po in the current pad. |
1202 | |
1203 | =cut |
1204 | */ |
1205 | |
1206 | /* XXX DAPM integrate with pad_swipe ???? */ |
1207 | void |
1208 | Perl_pad_free(pTHX_ PADOFFSET po) |
1209 | { |
f3548bdc |
1210 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 |
1211 | if (!PL_curpad) |
1212 | return; |
1213 | if (AvARRAY(PL_comppad) != PL_curpad) |
1214 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
1215 | if (!po) |
1216 | Perl_croak(aTHX_ "panic: pad_free po"); |
1217 | |
1218 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1219 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
1220 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
1221 | ); |
1222 | |
1223 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
1224 | SvPADTMP_off(PL_curpad[po]); |
1225 | #ifdef USE_ITHREADS |
7e736055 |
1226 | /* SV could be a shared hash key (eg bugid #19022) */ |
1227 | if ( |
dd2155a4 |
1228 | #ifdef PERL_COPY_ON_WRITE |
7e736055 |
1229 | !SvIsCOW(PL_curpad[po]) |
1230 | #else |
1231 | !SvFAKE(PL_curpad[po]) |
dd2155a4 |
1232 | #endif |
7e736055 |
1233 | ) |
dd2155a4 |
1234 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 |
1235 | #endif |
1236 | } |
1237 | if ((I32)po < PL_padix) |
1238 | PL_padix = po - 1; |
1239 | } |
1240 | |
1241 | |
1242 | |
1243 | /* |
1244 | =for apidoc do_dump_pad |
1245 | |
1246 | Dump the contents of a padlist |
1247 | |
1248 | =cut |
1249 | */ |
1250 | |
1251 | void |
1252 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
1253 | { |
1254 | AV *pad_name; |
1255 | AV *pad; |
1256 | SV **pname; |
1257 | SV **ppad; |
1258 | SV *namesv; |
1259 | I32 ix; |
1260 | |
1261 | if (!padlist) { |
1262 | return; |
1263 | } |
1264 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); |
1265 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); |
1266 | pname = AvARRAY(pad_name); |
1267 | ppad = AvARRAY(pad); |
1268 | Perl_dump_indent(aTHX_ level, file, |
1269 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
1270 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
1271 | ); |
1272 | |
1273 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
1274 | namesv = pname[ix]; |
1275 | if (namesv && namesv == &PL_sv_undef) { |
1276 | namesv = Nullsv; |
1277 | } |
1278 | if (namesv) { |
ee6cee0c |
1279 | if (SvFAKE(namesv)) |
1280 | Perl_dump_indent(aTHX_ level+1, file, |
c0fd1b42 |
1281 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c |
1282 | (int) ix, |
1283 | PTR2UV(ppad[ix]), |
1284 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
b5c19bd7 |
1285 | SvPVX(namesv), |
1286 | (unsigned long)SvIVX(namesv), |
1287 | (unsigned long)SvNVX(namesv) |
1288 | |
ee6cee0c |
1289 | ); |
1290 | else |
1291 | Perl_dump_indent(aTHX_ level+1, file, |
b5c19bd7 |
1292 | "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", |
ee6cee0c |
1293 | (int) ix, |
1294 | PTR2UV(ppad[ix]), |
1295 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
4cf4a199 |
1296 | (long)U_32(SvNVX(namesv)), |
b5c19bd7 |
1297 | (long)SvIVX(namesv), |
e9d09c08 |
1298 | SvPVX(namesv) |
ee6cee0c |
1299 | ); |
dd2155a4 |
1300 | } |
1301 | else if (full) { |
1302 | Perl_dump_indent(aTHX_ level+1, file, |
1303 | "%2d. 0x%"UVxf"<%lu>\n", |
1304 | (int) ix, |
1305 | PTR2UV(ppad[ix]), |
1306 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
1307 | ); |
1308 | } |
1309 | } |
1310 | } |
1311 | |
1312 | |
1313 | |
1314 | /* |
1315 | =for apidoc cv_dump |
1316 | |
1317 | dump the contents of a CV |
1318 | |
1319 | =cut |
1320 | */ |
1321 | |
1322 | #ifdef DEBUGGING |
1323 | STATIC void |
1324 | S_cv_dump(pTHX_ CV *cv, char *title) |
1325 | { |
1326 | CV *outside = CvOUTSIDE(cv); |
1327 | AV* padlist = CvPADLIST(cv); |
1328 | |
1329 | PerlIO_printf(Perl_debug_log, |
1330 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
1331 | title, |
1332 | PTR2UV(cv), |
1333 | (CvANON(cv) ? "ANON" |
71f882da |
1334 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 |
1335 | : (cv == PL_main_cv) ? "MAIN" |
1336 | : CvUNIQUE(cv) ? "UNIQUE" |
1337 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
1338 | PTR2UV(outside), |
1339 | (!outside ? "null" |
1340 | : CvANON(outside) ? "ANON" |
1341 | : (outside == PL_main_cv) ? "MAIN" |
1342 | : CvUNIQUE(outside) ? "UNIQUE" |
1343 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
1344 | |
1345 | PerlIO_printf(Perl_debug_log, |
1346 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
1347 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
1348 | } |
1349 | #endif /* DEBUGGING */ |
1350 | |
1351 | |
1352 | |
1353 | |
1354 | |
1355 | /* |
1356 | =for apidoc cv_clone |
1357 | |
1358 | Clone a CV: make a new CV which points to the same code etc, but which |
1359 | has a newly-created pad built by copying the prototype pad and capturing |
1360 | any outer lexicals. |
1361 | |
1362 | =cut |
1363 | */ |
1364 | |
1365 | CV * |
1366 | Perl_cv_clone(pTHX_ CV *proto) |
1367 | { |
dd2155a4 |
1368 | I32 ix; |
1369 | AV* protopadlist = CvPADLIST(proto); |
1370 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); |
1371 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); |
1372 | SV** pname = AvARRAY(protopad_name); |
1373 | SV** ppad = AvARRAY(protopad); |
1374 | I32 fname = AvFILLp(protopad_name); |
1375 | I32 fpad = AvFILLp(protopad); |
1376 | AV* comppadlist; |
1377 | CV* cv; |
b5c19bd7 |
1378 | SV** outpad; |
1379 | CV* outside; |
71f882da |
1380 | long depth; |
dd2155a4 |
1381 | |
1382 | assert(!CvUNIQUE(proto)); |
1383 | |
71f882da |
1384 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1385 | * to a prototype; we instead want the cloned parent who called us. |
1386 | * Note that in general for formats, CvOUTSIDE != find_runcv */ |
1387 | |
1388 | outside = CvOUTSIDE(proto); |
1389 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) |
1390 | outside = find_runcv(NULL); |
1391 | depth = CvDEPTH(outside); |
1392 | assert(depth || SvTYPE(proto) == SVt_PVFM); |
1393 | if (!depth) |
1394 | depth = 1; |
b5c19bd7 |
1395 | assert(CvPADLIST(outside)); |
1396 | |
dd2155a4 |
1397 | ENTER; |
1398 | SAVESPTR(PL_compcv); |
1399 | |
1400 | cv = PL_compcv = (CV*)NEWSV(1104, 0); |
1401 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
7dafbf52 |
1402 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 |
1403 | CvCLONED_on(cv); |
1404 | |
dd2155a4 |
1405 | #ifdef USE_ITHREADS |
1406 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) |
1407 | : savepv(CvFILE(proto)); |
1408 | #else |
1409 | CvFILE(cv) = CvFILE(proto); |
1410 | #endif |
1411 | CvGV(cv) = CvGV(proto); |
1412 | CvSTASH(cv) = CvSTASH(proto); |
1413 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
1414 | CvSTART(cv) = CvSTART(proto); |
b5c19bd7 |
1415 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1416 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
dd2155a4 |
1417 | |
1418 | if (SvPOK(proto)) |
1419 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); |
1420 | |
1421 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); |
1422 | |
b5c19bd7 |
1423 | av_fill(PL_comppad, fpad); |
dd2155a4 |
1424 | for (ix = fname; ix >= 0; ix--) |
1425 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
1426 | |
dd2155a4 |
1427 | PL_curpad = AvARRAY(PL_comppad); |
1428 | |
71f882da |
1429 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 |
1430 | |
dd2155a4 |
1431 | for (ix = fpad; ix > 0; ix--) { |
1432 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
71f882da |
1433 | SV *sv = Nullsv; |
1434 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
b5c19bd7 |
1435 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
71f882da |
1436 | sv = outpad[(I32)SvNVX(namesv)]; |
1437 | assert(sv); |
1438 | /* formats may have an inactive parent */ |
1439 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { |
1440 | if (ckWARN(WARN_CLOSURE)) |
1441 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
1442 | "Variable \"%s\" is not available", SvPVX(namesv)); |
1443 | sv = Nullsv; |
1444 | } |
1445 | else { |
1446 | assert(!SvPADSTALE(sv)); |
1447 | sv = SvREFCNT_inc(sv); |
1448 | } |
dd2155a4 |
1449 | } |
71f882da |
1450 | if (!sv) { |
b5c19bd7 |
1451 | char *name = SvPVX(namesv); |
1452 | if (*name == '&') |
dd2155a4 |
1453 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 |
1454 | else if (*name == '@') |
1455 | sv = (SV*)newAV(); |
1456 | else if (*name == '%') |
1457 | sv = (SV*)newHV(); |
1458 | else |
1459 | sv = NEWSV(0, 0); |
235cc2e3 |
1460 | SvPADMY_on(sv); |
dd2155a4 |
1461 | } |
1462 | } |
1463 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
71f882da |
1464 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 |
1465 | } |
1466 | else { |
b5c19bd7 |
1467 | sv = NEWSV(0, 0); |
dd2155a4 |
1468 | SvPADTMP_on(sv); |
dd2155a4 |
1469 | } |
71f882da |
1470 | PL_curpad[ix] = sv; |
dd2155a4 |
1471 | } |
1472 | |
dd2155a4 |
1473 | DEBUG_Xv( |
1474 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
1475 | cv_dump(outside, "Outside"); |
1476 | cv_dump(proto, "Proto"); |
1477 | cv_dump(cv, "To"); |
1478 | ); |
1479 | |
1480 | LEAVE; |
1481 | |
1482 | if (CvCONST(cv)) { |
b5c19bd7 |
1483 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1484 | * The prototype was marked as a candiate for const-ization, |
1485 | * so try to grab the current const value, and if successful, |
1486 | * turn into a const sub: |
1487 | */ |
dd2155a4 |
1488 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 |
1489 | if (const_sv) { |
1490 | SvREFCNT_dec(cv); |
1491 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); |
1492 | } |
1493 | else { |
1494 | CvCONST_off(cv); |
1495 | } |
dd2155a4 |
1496 | } |
1497 | |
1498 | return cv; |
1499 | } |
1500 | |
1501 | |
1502 | /* |
1503 | =for apidoc pad_fixup_inner_anons |
1504 | |
1505 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
7dafbf52 |
1506 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1507 | moved to a pre-existing CV struct. |
dd2155a4 |
1508 | |
1509 | =cut |
1510 | */ |
1511 | |
1512 | void |
1513 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
1514 | { |
1515 | I32 ix; |
1516 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
1517 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
1518 | SV **namepad = AvARRAY(comppad_name); |
1519 | SV **curpad = AvARRAY(comppad); |
1520 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
1521 | SV *namesv = namepad[ix]; |
1522 | if (namesv && namesv != &PL_sv_undef |
1523 | && *SvPVX(namesv) == '&') |
1524 | { |
1525 | CV *innercv = (CV*)curpad[ix]; |
7dafbf52 |
1526 | assert(CvWEAKOUTSIDE(innercv)); |
1527 | assert(CvOUTSIDE(innercv) == old_cv); |
1528 | CvOUTSIDE(innercv) = new_cv; |
dd2155a4 |
1529 | } |
1530 | } |
1531 | } |
1532 | |
7dafbf52 |
1533 | |
dd2155a4 |
1534 | /* |
1535 | =for apidoc pad_push |
1536 | |
1537 | Push a new pad frame onto the padlist, unless there's already a pad at |
1538 | this depth, in which case don't bother creating a new one. |
1539 | If has_args is true, give the new pad an @_ in slot zero. |
1540 | |
1541 | =cut |
1542 | */ |
1543 | |
ff0adf16 |
1544 | /* XXX pad_push is now always called with has_args == 1. Get rid of |
1545 | * this arg at some point */ |
1546 | |
dd2155a4 |
1547 | void |
1548 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) |
1549 | { |
1550 | if (depth <= AvFILLp(padlist)) |
1551 | return; |
1552 | |
1553 | { |
1554 | SV** svp = AvARRAY(padlist); |
1555 | AV *newpad = newAV(); |
1556 | SV **oldpad = AvARRAY(svp[depth-1]); |
1557 | I32 ix = AvFILLp((AV*)svp[1]); |
1558 | I32 names_fill = AvFILLp((AV*)svp[0]); |
1559 | SV** names = AvARRAY(svp[0]); |
1560 | SV* sv; |
1561 | for ( ;ix > 0; ix--) { |
1562 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
1563 | char *name = SvPVX(names[ix]); |
1564 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { |
1565 | /* outer lexical or anon code */ |
1566 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
1567 | } |
1568 | else { /* our own lexical */ |
1569 | if (*name == '@') |
1570 | av_store(newpad, ix, sv = (SV*)newAV()); |
1571 | else if (*name == '%') |
1572 | av_store(newpad, ix, sv = (SV*)newHV()); |
1573 | else |
1574 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1575 | SvPADMY_on(sv); |
1576 | } |
1577 | } |
1578 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
1579 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); |
1580 | } |
1581 | else { |
1582 | /* save temporaries on recursion? */ |
1583 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1584 | SvPADTMP_on(sv); |
1585 | } |
1586 | } |
1587 | if (has_args) { |
1588 | AV* av = newAV(); |
1589 | av_extend(av, 0); |
1590 | av_store(newpad, 0, (SV*)av); |
1591 | AvFLAGS(av) = AVf_REIFY; |
1592 | } |
1593 | av_store(padlist, depth, (SV*)newpad); |
1594 | AvFILLp(padlist) = depth; |
1595 | } |
1596 | } |