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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 | |
61296642 |
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) |
61296642 |
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 |
b5c19bd7 |
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: |
a6d05634 |
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 |
dd2155a4 |
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 * |
c7c737cb |
133 | Perl_pad_new(pTHX_ int flags) |
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134 | { |
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135 | AV *padlist, *padname, *pad; |
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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) { |
3979c56f |
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 | |
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176 | AV * const a0 = newAV(); /* will be @_ */ |
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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; |
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232 | const PADLIST *padlist = CvPADLIST(cv); |
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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); |
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252 | const 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 | { |
7fc63493 |
262 | CV * const innercv = (CV*)curpad[ix]; |
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263 | namepad[ix] = Nullsv; |
264 | SvREFCNT_dec(namesv); |
01773faa |
265 | |
266 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ |
267 | curpad[ix] = Nullsv; |
268 | SvREFCNT_dec(innercv); |
269 | } |
7dafbf52 |
270 | if (SvREFCNT(innercv) /* in use, not just a prototype */ |
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271 | && CvOUTSIDE(innercv) == cv) |
272 | { |
7dafbf52 |
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; |
7fc63493 |
279 | (void)SvREFCNT_inc(outercv); |
9d1ce744 |
280 | } |
281 | else { |
282 | CvOUTSIDE(innercv) = Nullcv; |
283 | } |
284 | |
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285 | } |
9d1ce744 |
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 |
e1ec3a88 |
327 | Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake) |
dd2155a4 |
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); |
b5c19bd7 |
348 | if (fake) { |
dd2155a4 |
349 | SvFAKE_on(namesv); |
b5c19bd7 |
350 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
351 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); |
352 | } |
dd2155a4 |
353 | else { |
ee6cee0c |
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] ? */ |
dd2155a4 |
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]); |
b5c19bd7 |
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]))); |
dd2155a4 |
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 | |
dd2155a4 |
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); |
dd2155a4 |
408 | retval = AvFILLp(PL_comppad); |
409 | } |
410 | else { |
411 | SV **names = AvARRAY(PL_comppad_name); |
e1ec3a88 |
412 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
dd2155a4 |
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])); |
fd0854ff |
437 | #ifdef DEBUG_LEAKING_SCALARS |
438 | sv->sv_debug_optype = optype; |
439 | sv->sv_debug_inpad = 1; |
fd0854ff |
440 | #endif |
a212c8b5 |
441 | return (PADOFFSET)retval; |
dd2155a4 |
442 | } |
443 | |
444 | /* |
445 | =for apidoc pad_add_anon |
446 | |
447 | Add an anon code entry to the current compiling pad |
448 | |
449 | =cut |
450 | */ |
451 | |
452 | PADOFFSET |
453 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) |
454 | { |
455 | PADOFFSET ix; |
456 | SV* name; |
457 | |
458 | name = NEWSV(1106, 0); |
459 | sv_upgrade(name, SVt_PVNV); |
460 | sv_setpvn(name, "&", 1); |
461 | SvIVX(name) = -1; |
462 | SvNVX(name) = 1; |
463 | ix = pad_alloc(op_type, SVs_PADMY); |
464 | av_store(PL_comppad_name, ix, name); |
f3548bdc |
465 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 |
466 | av_store(PL_comppad, ix, sv); |
467 | SvPADMY_on(sv); |
7dafbf52 |
468 | |
469 | /* to avoid ref loops, we never have parent + child referencing each |
470 | * other simultaneously */ |
471 | if (CvOUTSIDE((CV*)sv)) { |
472 | assert(!CvWEAKOUTSIDE((CV*)sv)); |
473 | CvWEAKOUTSIDE_on((CV*)sv); |
474 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); |
475 | } |
dd2155a4 |
476 | return ix; |
477 | } |
478 | |
479 | |
480 | |
481 | /* |
482 | =for apidoc pad_check_dup |
483 | |
484 | Check for duplicate declarations: report any of: |
485 | * a my in the current scope with the same name; |
486 | * an our (anywhere in the pad) with the same name and the same stash |
487 | as C<ourstash> |
488 | C<is_our> indicates that the name to check is an 'our' declaration |
489 | |
490 | =cut |
491 | */ |
492 | |
493 | /* XXX DAPM integrate this into pad_add_name ??? */ |
494 | |
495 | void |
e1ec3a88 |
496 | Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash) |
dd2155a4 |
497 | { |
498 | SV **svp, *sv; |
499 | PADOFFSET top, off; |
500 | |
f3548bdc |
501 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
dd2155a4 |
502 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
503 | return; /* nothing to check */ |
504 | |
505 | svp = AvARRAY(PL_comppad_name); |
506 | top = AvFILLp(PL_comppad_name); |
507 | /* check the current scope */ |
508 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
509 | * type ? */ |
510 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
511 | if ((sv = svp[off]) |
512 | && sv != &PL_sv_undef |
ee6cee0c |
513 | && !SvFAKE(sv) |
dd2155a4 |
514 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
515 | && (!is_our |
516 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) |
517 | && strEQ(name, SvPVX(sv))) |
518 | { |
519 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
520 | "\"%s\" variable %s masks earlier declaration in same %s", |
521 | (is_our ? "our" : "my"), |
522 | name, |
523 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); |
524 | --off; |
525 | break; |
526 | } |
527 | } |
528 | /* check the rest of the pad */ |
529 | if (is_our) { |
530 | do { |
531 | if ((sv = svp[off]) |
532 | && sv != &PL_sv_undef |
ee6cee0c |
533 | && !SvFAKE(sv) |
dd2155a4 |
534 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
535 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) |
536 | && strEQ(name, SvPVX(sv))) |
537 | { |
538 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
539 | "\"our\" variable %s redeclared", name); |
540 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
541 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
542 | break; |
543 | } |
544 | } while ( off-- > 0 ); |
545 | } |
546 | } |
547 | |
548 | |
dd2155a4 |
549 | /* |
550 | =for apidoc pad_findmy |
551 | |
552 | Given a lexical name, try to find its offset, first in the current pad, |
553 | or failing that, in the pads of any lexically enclosing subs (including |
554 | the complications introduced by eval). If the name is found in an outer pad, |
555 | then a fake entry is added to the current pad. |
556 | Returns the offset in the current pad, or NOT_IN_PAD on failure. |
557 | |
558 | =cut |
559 | */ |
560 | |
561 | PADOFFSET |
e1ec3a88 |
562 | Perl_pad_findmy(pTHX_ const char *name) |
dd2155a4 |
563 | { |
b5c19bd7 |
564 | SV *out_sv; |
565 | int out_flags; |
929a0744 |
566 | I32 offset; |
e1ec3a88 |
567 | const AV *nameav; |
929a0744 |
568 | SV **name_svp; |
dd2155a4 |
569 | |
929a0744 |
570 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
b5c19bd7 |
571 | Null(SV**), &out_sv, &out_flags); |
929a0744 |
572 | if (offset != NOT_IN_PAD) |
573 | return offset; |
574 | |
575 | /* look for an our that's being introduced; this allows |
576 | * our $foo = 0 unless defined $foo; |
577 | * to not give a warning. (Yes, this is a hack) */ |
578 | |
579 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; |
580 | name_svp = AvARRAY(nameav); |
581 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
e1ec3a88 |
582 | const SV *namesv = name_svp[offset]; |
929a0744 |
583 | if (namesv && namesv != &PL_sv_undef |
584 | && !SvFAKE(namesv) |
585 | && (SvFLAGS(namesv) & SVpad_OUR) |
586 | && strEQ(SvPVX(namesv), name) |
4cf4a199 |
587 | && U_32(SvNVX(namesv)) == PAD_MAX /* min */ |
929a0744 |
588 | ) |
589 | return offset; |
590 | } |
591 | return NOT_IN_PAD; |
dd2155a4 |
592 | } |
593 | |
e1f795dc |
594 | /* |
595 | * Returns the offset of a lexical $_, if there is one, at run time. |
596 | * Used by the UNDERBAR XS macro. |
597 | */ |
598 | |
599 | PADOFFSET |
29289021 |
600 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc |
601 | { |
602 | SV *out_sv; |
603 | int out_flags; |
604 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, |
605 | Null(SV**), &out_sv, &out_flags); |
606 | } |
dd2155a4 |
607 | |
dd2155a4 |
608 | /* |
609 | =for apidoc pad_findlex |
610 | |
611 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
b5c19bd7 |
612 | in the inner pads if it's found in an outer one. |
613 | |
614 | Returns the offset in the bottom pad of the lex or the fake lex. |
615 | cv is the CV in which to start the search, and seq is the current cop_seq |
616 | to match against. If warn is true, print appropriate warnings. The out_* |
617 | vars return values, and so are pointers to where the returned values |
618 | should be stored. out_capture, if non-null, requests that the innermost |
619 | instance of the lexical is captured; out_name_sv is set to the innermost |
620 | matched namesv or fake namesv; out_flags returns the flags normally |
621 | associated with the IVX field of a fake namesv. |
622 | |
623 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, |
624 | then comes back down, adding fake entries as it goes. It has to be this way |
625 | because fake namesvs in anon protoypes have to store in NVX the index into |
626 | the parent pad. |
dd2155a4 |
627 | |
628 | =cut |
629 | */ |
630 | |
b5c19bd7 |
631 | /* Flags set in the SvIVX field of FAKE namesvs */ |
632 | |
633 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ |
634 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ |
635 | |
636 | /* the CV has finished being compiled. This is not a sufficient test for |
637 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ |
638 | #define CvCOMPILED(cv) CvROOT(cv) |
639 | |
71f882da |
640 | /* the CV does late binding of its lexicals */ |
641 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) |
642 | |
b5c19bd7 |
643 | |
dd2155a4 |
644 | STATIC PADOFFSET |
e1ec3a88 |
645 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
b5c19bd7 |
646 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 |
647 | { |
b5c19bd7 |
648 | I32 offset, new_offset; |
649 | SV *new_capture; |
650 | SV **new_capturep; |
e1ec3a88 |
651 | const AV *padlist = CvPADLIST(cv); |
dd2155a4 |
652 | |
b5c19bd7 |
653 | *out_flags = 0; |
a3985cdc |
654 | |
b5c19bd7 |
655 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
656 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", |
657 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); |
dd2155a4 |
658 | |
b5c19bd7 |
659 | /* first, search this pad */ |
dd2155a4 |
660 | |
b5c19bd7 |
661 | if (padlist) { /* not an undef CV */ |
662 | I32 fake_offset = 0; |
e1ec3a88 |
663 | const AV *nameav = (AV*)AvARRAY(padlist)[0]; |
b5c19bd7 |
664 | SV **name_svp = AvARRAY(nameav); |
ee6cee0c |
665 | |
b5c19bd7 |
666 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
e1ec3a88 |
667 | const SV *namesv = name_svp[offset]; |
b5c19bd7 |
668 | if (namesv && namesv != &PL_sv_undef |
669 | && strEQ(SvPVX(namesv), name)) |
670 | { |
671 | if (SvFAKE(namesv)) |
672 | fake_offset = offset; /* in case we don't find a real one */ |
4cf4a199 |
673 | else if ( seq > U_32(SvNVX(namesv)) /* min */ |
674 | && seq <= (U32)SvIVX(namesv)) /* max */ |
b5c19bd7 |
675 | break; |
ee6cee0c |
676 | } |
677 | } |
678 | |
b5c19bd7 |
679 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
680 | if (offset > 0) { /* not fake */ |
681 | fake_offset = 0; |
682 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
683 | |
684 | /* set PAD_FAKELEX_MULTI if this lex can have multiple |
685 | * instances. For now, we just test !CvUNIQUE(cv), but |
686 | * ideally, we should detect my's declared within loops |
687 | * etc - this would allow a wider range of 'not stayed |
688 | * shared' warnings. We also treated alreadly-compiled |
689 | * lexes as not multi as viewed from evals. */ |
690 | |
691 | *out_flags = CvANON(cv) ? |
692 | PAD_FAKELEX_ANON : |
693 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) |
694 | ? PAD_FAKELEX_MULTI : 0; |
695 | |
696 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
697 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", |
4cf4a199 |
698 | PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), |
b5c19bd7 |
699 | (long)SvIVX(*out_name_sv))); |
700 | } |
701 | else { /* fake match */ |
702 | offset = fake_offset; |
703 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
704 | *out_flags = SvIVX(*out_name_sv); |
705 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
19a5c512 |
706 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 |
707 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
708 | (unsigned long)SvNVX(*out_name_sv) |
709 | )); |
710 | } |
dd2155a4 |
711 | |
b5c19bd7 |
712 | /* return the lex? */ |
dd2155a4 |
713 | |
b5c19bd7 |
714 | if (out_capture) { |
dd2155a4 |
715 | |
b5c19bd7 |
716 | /* our ? */ |
717 | if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) { |
718 | *out_capture = Nullsv; |
719 | return offset; |
720 | } |
ee6cee0c |
721 | |
b5c19bd7 |
722 | /* trying to capture from an anon prototype? */ |
723 | if (CvCOMPILED(cv) |
724 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) |
725 | : *out_flags & PAD_FAKELEX_ANON) |
726 | { |
727 | if (warn && ckWARN(WARN_CLOSURE)) |
728 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
729 | "Variable \"%s\" is not available", name); |
730 | *out_capture = Nullsv; |
731 | } |
ee6cee0c |
732 | |
b5c19bd7 |
733 | /* real value */ |
734 | else { |
735 | int newwarn = warn; |
736 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) |
737 | && warn && ckWARN(WARN_CLOSURE)) { |
738 | newwarn = 0; |
739 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
740 | "Variable \"%s\" will not stay shared", name); |
741 | } |
dd2155a4 |
742 | |
b5c19bd7 |
743 | if (fake_offset && CvANON(cv) |
744 | && CvCLONE(cv) &&!CvCLONED(cv)) |
745 | { |
746 | SV *n; |
747 | /* not yet caught - look further up */ |
748 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
749 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", |
750 | PTR2UV(cv))); |
751 | n = *out_name_sv; |
752 | pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), |
753 | newwarn, out_capture, out_name_sv, out_flags); |
754 | *out_name_sv = n; |
755 | return offset; |
dd2155a4 |
756 | } |
b5c19bd7 |
757 | |
758 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ |
759 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; |
760 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
761 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", |
19a5c512 |
762 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 |
763 | |
764 | if (SvPADSTALE(*out_capture)) { |
765 | if (ckWARN(WARN_CLOSURE)) |
ee6cee0c |
766 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 |
767 | "Variable \"%s\" is not available", name); |
768 | *out_capture = Nullsv; |
dd2155a4 |
769 | } |
770 | } |
b5c19bd7 |
771 | if (!*out_capture) { |
772 | if (*name == '@') |
773 | *out_capture = sv_2mortal((SV*)newAV()); |
774 | else if (*name == '%') |
775 | *out_capture = sv_2mortal((SV*)newHV()); |
776 | else |
777 | *out_capture = sv_newmortal(); |
778 | } |
dd2155a4 |
779 | } |
b5c19bd7 |
780 | |
781 | return offset; |
ee6cee0c |
782 | } |
b5c19bd7 |
783 | } |
784 | |
785 | /* it's not in this pad - try above */ |
786 | |
787 | if (!CvOUTSIDE(cv)) |
788 | return NOT_IN_PAD; |
789 | |
790 | /* out_capture non-null means caller wants us to capture lex; in |
71f882da |
791 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 |
792 | new_capturep = out_capture ? out_capture : |
71f882da |
793 | CvLATE(cv) ? Null(SV**) : &new_capture; |
b5c19bd7 |
794 | |
795 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, |
796 | new_capturep, out_name_sv, out_flags); |
797 | if (offset == NOT_IN_PAD) |
798 | return NOT_IN_PAD; |
799 | |
800 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
801 | |
802 | /* don't add new fake entries (via eval) to CVs that we have already |
803 | * finished compiling, or to undef CVs */ |
804 | if (CvCOMPILED(cv) || !padlist) |
805 | return 0; /* this dummy (and invalid) value isnt used by the caller */ |
806 | |
807 | { |
808 | SV *new_namesv; |
809 | AV *ocomppad_name = PL_comppad_name; |
810 | PAD *ocomppad = PL_comppad; |
811 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
812 | PL_comppad = (AV*)AvARRAY(padlist)[1]; |
813 | PL_curpad = AvARRAY(PL_comppad); |
814 | |
815 | new_offset = pad_add_name( |
816 | SvPVX(*out_name_sv), |
817 | (SvFLAGS(*out_name_sv) & SVpad_TYPED) |
818 | ? SvSTASH(*out_name_sv) : Nullhv, |
819 | (SvFLAGS(*out_name_sv) & SVpad_OUR) |
820 | ? GvSTASH(*out_name_sv) : Nullhv, |
821 | 1 /* fake */ |
822 | ); |
823 | |
824 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; |
825 | SvIVX(new_namesv) = *out_flags; |
826 | |
827 | SvNVX(new_namesv) = (NV)0; |
828 | if (SvFLAGS(new_namesv) & SVpad_OUR) { |
829 | /* do nothing */ |
830 | } |
71f882da |
831 | else if (CvLATE(cv)) { |
b5c19bd7 |
832 | /* delayed creation - just note the offset within parent pad */ |
833 | SvNVX(new_namesv) = (NV)offset; |
834 | CvCLONE_on(cv); |
835 | } |
836 | else { |
837 | /* immediate creation - capture outer value right now */ |
838 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); |
839 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
840 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", |
841 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); |
dd2155a4 |
842 | } |
b5c19bd7 |
843 | *out_name_sv = new_namesv; |
844 | *out_flags = SvIVX(new_namesv); |
845 | |
846 | PL_comppad_name = ocomppad_name; |
847 | PL_comppad = ocomppad; |
848 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **); |
dd2155a4 |
849 | } |
b5c19bd7 |
850 | return new_offset; |
dd2155a4 |
851 | } |
852 | |
b5c19bd7 |
853 | |
dd2155a4 |
854 | /* |
855 | =for apidoc pad_sv |
856 | |
857 | Get the value at offset po in the current pad. |
858 | Use macro PAD_SV instead of calling this function directly. |
859 | |
860 | =cut |
861 | */ |
862 | |
863 | |
864 | SV * |
865 | Perl_pad_sv(pTHX_ PADOFFSET po) |
866 | { |
f3548bdc |
867 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 |
868 | |
dd2155a4 |
869 | if (!po) |
870 | Perl_croak(aTHX_ "panic: pad_sv po"); |
dd2155a4 |
871 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
872 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
873 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 |
874 | ); |
875 | return PL_curpad[po]; |
876 | } |
877 | |
878 | |
879 | /* |
880 | =for apidoc pad_setsv |
881 | |
882 | Set the entry at offset po in the current pad to sv. |
883 | Use the macro PAD_SETSV() rather than calling this function directly. |
884 | |
885 | =cut |
886 | */ |
887 | |
888 | #ifdef DEBUGGING |
889 | void |
890 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
891 | { |
f3548bdc |
892 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 |
893 | |
894 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
895 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
896 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 |
897 | ); |
898 | PL_curpad[po] = sv; |
899 | } |
900 | #endif |
901 | |
902 | |
903 | |
904 | /* |
905 | =for apidoc pad_block_start |
906 | |
907 | Update the pad compilation state variables on entry to a new block |
908 | |
909 | =cut |
910 | */ |
911 | |
912 | /* XXX DAPM perhaps: |
913 | * - integrate this in general state-saving routine ??? |
914 | * - combine with the state-saving going on in pad_new ??? |
915 | * - introduce a new SAVE type that does all this in one go ? |
916 | */ |
917 | |
918 | void |
919 | Perl_pad_block_start(pTHX_ int full) |
920 | { |
f3548bdc |
921 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 |
922 | SAVEI32(PL_comppad_name_floor); |
923 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
924 | if (full) |
925 | PL_comppad_name_fill = PL_comppad_name_floor; |
926 | if (PL_comppad_name_floor < 0) |
927 | PL_comppad_name_floor = 0; |
928 | SAVEI32(PL_min_intro_pending); |
929 | SAVEI32(PL_max_intro_pending); |
930 | PL_min_intro_pending = 0; |
931 | SAVEI32(PL_comppad_name_fill); |
932 | SAVEI32(PL_padix_floor); |
933 | PL_padix_floor = PL_padix; |
934 | PL_pad_reset_pending = FALSE; |
935 | } |
936 | |
937 | |
938 | /* |
939 | =for apidoc intro_my |
940 | |
941 | "Introduce" my variables to visible status. |
942 | |
943 | =cut |
944 | */ |
945 | |
946 | U32 |
947 | Perl_intro_my(pTHX) |
948 | { |
949 | SV **svp; |
950 | SV *sv; |
951 | I32 i; |
952 | |
f3548bdc |
953 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 |
954 | if (! PL_min_intro_pending) |
955 | return PL_cop_seqmax; |
956 | |
957 | svp = AvARRAY(PL_comppad_name); |
958 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
ee6cee0c |
959 | if ((sv = svp[i]) && sv != &PL_sv_undef |
960 | && !SvFAKE(sv) && !SvIVX(sv)) |
961 | { |
dd2155a4 |
962 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
963 | SvNVX(sv) = (NV)PL_cop_seqmax; |
964 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
965 | "Pad intromy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 |
966 | (long)i, SvPVX(sv), |
4cf4a199 |
967 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 |
968 | ); |
969 | } |
970 | } |
971 | PL_min_intro_pending = 0; |
972 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
973 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
974 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); |
975 | |
976 | return PL_cop_seqmax++; |
977 | } |
978 | |
979 | /* |
980 | =for apidoc pad_leavemy |
981 | |
982 | Cleanup at end of scope during compilation: set the max seq number for |
983 | lexicals in this scope and warn of any lexicals that never got introduced. |
984 | |
985 | =cut |
986 | */ |
987 | |
988 | void |
989 | Perl_pad_leavemy(pTHX) |
990 | { |
991 | I32 off; |
992 | SV **svp = AvARRAY(PL_comppad_name); |
dd2155a4 |
993 | |
994 | PL_pad_reset_pending = FALSE; |
995 | |
f3548bdc |
996 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 |
997 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
998 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
e1ec3a88 |
999 | const SV *sv; |
ee6cee0c |
1000 | if ((sv = svp[off]) && sv != &PL_sv_undef |
1001 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
dd2155a4 |
1002 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
35c1215d |
1003 | "%"SVf" never introduced", sv); |
dd2155a4 |
1004 | } |
1005 | } |
1006 | /* "Deintroduce" my variables that are leaving with this scope. */ |
1007 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
e1ec3a88 |
1008 | const SV *sv; |
ee6cee0c |
1009 | if ((sv = svp[off]) && sv != &PL_sv_undef |
1010 | && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) |
1011 | { |
dd2155a4 |
1012 | SvIVX(sv) = PL_cop_seqmax; |
1013 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
1014 | "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 |
1015 | (long)off, SvPVX(sv), |
4cf4a199 |
1016 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 |
1017 | ); |
1018 | } |
1019 | } |
1020 | PL_cop_seqmax++; |
1021 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1022 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
1023 | } |
1024 | |
1025 | |
1026 | /* |
1027 | =for apidoc pad_swipe |
1028 | |
1029 | Abandon the tmp in the current pad at offset po and replace with a |
1030 | new one. |
1031 | |
1032 | =cut |
1033 | */ |
1034 | |
1035 | void |
1036 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
1037 | { |
f3548bdc |
1038 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 |
1039 | if (!PL_curpad) |
1040 | return; |
1041 | if (AvARRAY(PL_comppad) != PL_curpad) |
1042 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
1043 | if (!po) |
1044 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
1045 | |
1046 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1047 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
1048 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
1049 | |
1050 | if (PL_curpad[po]) |
1051 | SvPADTMP_off(PL_curpad[po]); |
1052 | if (refadjust) |
1053 | SvREFCNT_dec(PL_curpad[po]); |
1054 | |
1055 | PL_curpad[po] = NEWSV(1107,0); |
1056 | SvPADTMP_on(PL_curpad[po]); |
1057 | if ((I32)po < PL_padix) |
1058 | PL_padix = po - 1; |
1059 | } |
1060 | |
1061 | |
1062 | /* |
1063 | =for apidoc pad_reset |
1064 | |
1065 | Mark all the current temporaries for reuse |
1066 | |
1067 | =cut |
1068 | */ |
1069 | |
1070 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
1071 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
1072 | * on the stack by OPs that use them, there are several ways to get an alias |
1073 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
1074 | * We avoid doing this until we can think of a Better Way. |
1075 | * GSAR 97-10-29 */ |
1076 | void |
1077 | Perl_pad_reset(pTHX) |
1078 | { |
1079 | #ifdef USE_BROKEN_PAD_RESET |
dd2155a4 |
1080 | if (AvARRAY(PL_comppad) != PL_curpad) |
1081 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
1082 | |
1083 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1084 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
1085 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
1086 | (long)PL_padix, (long)PL_padix_floor |
1087 | ) |
1088 | ); |
1089 | |
1090 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
e1ec3a88 |
1091 | register I32 po; |
dd2155a4 |
1092 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1093 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
1094 | SvPADTMP_off(PL_curpad[po]); |
1095 | } |
1096 | PL_padix = PL_padix_floor; |
1097 | } |
1098 | #endif |
1099 | PL_pad_reset_pending = FALSE; |
1100 | } |
1101 | |
1102 | |
1103 | /* |
1104 | =for apidoc pad_tidy |
1105 | |
1106 | Tidy up a pad after we've finished compiling it: |
1107 | * remove most stuff from the pads of anonsub prototypes; |
1108 | * give it a @_; |
1109 | * mark tmps as such. |
1110 | |
1111 | =cut |
1112 | */ |
1113 | |
1114 | /* XXX DAPM surely most of this stuff should be done properly |
1115 | * at the right time beforehand, rather than going around afterwards |
1116 | * cleaning up our mistakes ??? |
1117 | */ |
1118 | |
1119 | void |
1120 | Perl_pad_tidy(pTHX_ padtidy_type type) |
1121 | { |
1122 | PADOFFSET ix; |
1123 | |
f3548bdc |
1124 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 |
1125 | |
1126 | /* If this CV has had any 'eval-capable' ops planted in it |
1127 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any |
1128 | * anon prototypes in the chain of CVs should be marked as cloneable, |
1129 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets |
1130 | * the right CvOUTSIDE. |
1131 | * If running with -d, *any* sub may potentially have an eval |
1132 | * excuted within it. |
1133 | */ |
1134 | |
1135 | if (PL_cv_has_eval || PL_perldb) { |
e1ec3a88 |
1136 | const CV *cv; |
b5c19bd7 |
1137 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1138 | if (cv != PL_compcv && CvCOMPILED(cv)) |
1139 | break; /* no need to mark already-compiled code */ |
1140 | if (CvANON(cv)) { |
1141 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1142 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); |
1143 | CvCLONE_on(cv); |
1144 | } |
1145 | } |
1146 | } |
1147 | |
dd2155a4 |
1148 | /* extend curpad to match namepad */ |
1149 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
1150 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); |
1151 | |
1152 | if (type == padtidy_SUBCLONE) { |
1153 | SV **namep = AvARRAY(PL_comppad_name); |
b5c19bd7 |
1154 | |
dd2155a4 |
1155 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1156 | SV *namesv; |
1157 | |
1158 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1159 | continue; |
1160 | /* |
1161 | * The only things that a clonable function needs in its |
b5c19bd7 |
1162 | * pad are anonymous subs. |
dd2155a4 |
1163 | * The rest are created anew during cloning. |
1164 | */ |
1165 | if (!((namesv = namep[ix]) != Nullsv && |
1166 | namesv != &PL_sv_undef && |
b5c19bd7 |
1167 | *SvPVX(namesv) == '&')) |
dd2155a4 |
1168 | { |
1169 | SvREFCNT_dec(PL_curpad[ix]); |
1170 | PL_curpad[ix] = Nullsv; |
1171 | } |
1172 | } |
1173 | } |
1174 | else if (type == padtidy_SUB) { |
1175 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
1176 | AV *av = newAV(); /* Will be @_ */ |
1177 | av_extend(av, 0); |
1178 | av_store(PL_comppad, 0, (SV*)av); |
1179 | AvFLAGS(av) = AVf_REIFY; |
1180 | } |
1181 | |
1182 | /* XXX DAPM rationalise these two similar branches */ |
1183 | |
1184 | if (type == padtidy_SUB) { |
1185 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1186 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1187 | continue; |
1188 | if (!SvPADMY(PL_curpad[ix])) |
1189 | SvPADTMP_on(PL_curpad[ix]); |
1190 | } |
1191 | } |
1192 | else if (type == padtidy_FORMAT) { |
1193 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1194 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) |
1195 | SvPADTMP_on(PL_curpad[ix]); |
1196 | } |
1197 | } |
f3548bdc |
1198 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 |
1199 | } |
1200 | |
1201 | |
1202 | /* |
1203 | =for apidoc pad_free |
1204 | |
1205 | Free the SV at offet po in the current pad. |
1206 | |
1207 | =cut |
1208 | */ |
1209 | |
1210 | /* XXX DAPM integrate with pad_swipe ???? */ |
1211 | void |
1212 | Perl_pad_free(pTHX_ PADOFFSET po) |
1213 | { |
f3548bdc |
1214 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 |
1215 | if (!PL_curpad) |
1216 | return; |
1217 | if (AvARRAY(PL_comppad) != PL_curpad) |
1218 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
1219 | if (!po) |
1220 | Perl_croak(aTHX_ "panic: pad_free po"); |
1221 | |
1222 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1223 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
1224 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
1225 | ); |
1226 | |
1227 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
1228 | SvPADTMP_off(PL_curpad[po]); |
1229 | #ifdef USE_ITHREADS |
7e736055 |
1230 | /* SV could be a shared hash key (eg bugid #19022) */ |
1231 | if ( |
dd2155a4 |
1232 | #ifdef PERL_COPY_ON_WRITE |
7e736055 |
1233 | !SvIsCOW(PL_curpad[po]) |
1234 | #else |
1235 | !SvFAKE(PL_curpad[po]) |
dd2155a4 |
1236 | #endif |
7e736055 |
1237 | ) |
dd2155a4 |
1238 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 |
1239 | #endif |
1240 | } |
1241 | if ((I32)po < PL_padix) |
1242 | PL_padix = po - 1; |
1243 | } |
1244 | |
1245 | |
1246 | |
1247 | /* |
1248 | =for apidoc do_dump_pad |
1249 | |
1250 | Dump the contents of a padlist |
1251 | |
1252 | =cut |
1253 | */ |
1254 | |
1255 | void |
1256 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
1257 | { |
e1ec3a88 |
1258 | const AV *pad_name; |
1259 | const AV *pad; |
dd2155a4 |
1260 | SV **pname; |
1261 | SV **ppad; |
dd2155a4 |
1262 | I32 ix; |
1263 | |
1264 | if (!padlist) { |
1265 | return; |
1266 | } |
1267 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); |
1268 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); |
1269 | pname = AvARRAY(pad_name); |
1270 | ppad = AvARRAY(pad); |
1271 | Perl_dump_indent(aTHX_ level, file, |
1272 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
1273 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
1274 | ); |
1275 | |
1276 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
e1ec3a88 |
1277 | const SV *namesv = pname[ix]; |
dd2155a4 |
1278 | if (namesv && namesv == &PL_sv_undef) { |
1279 | namesv = Nullsv; |
1280 | } |
1281 | if (namesv) { |
ee6cee0c |
1282 | if (SvFAKE(namesv)) |
1283 | Perl_dump_indent(aTHX_ level+1, file, |
c0fd1b42 |
1284 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c |
1285 | (int) ix, |
1286 | PTR2UV(ppad[ix]), |
1287 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
b5c19bd7 |
1288 | SvPVX(namesv), |
1289 | (unsigned long)SvIVX(namesv), |
1290 | (unsigned long)SvNVX(namesv) |
1291 | |
ee6cee0c |
1292 | ); |
1293 | else |
1294 | Perl_dump_indent(aTHX_ level+1, file, |
b5c19bd7 |
1295 | "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", |
ee6cee0c |
1296 | (int) ix, |
1297 | PTR2UV(ppad[ix]), |
1298 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
4cf4a199 |
1299 | (long)U_32(SvNVX(namesv)), |
b5c19bd7 |
1300 | (long)SvIVX(namesv), |
e9d09c08 |
1301 | SvPVX(namesv) |
ee6cee0c |
1302 | ); |
dd2155a4 |
1303 | } |
1304 | else if (full) { |
1305 | Perl_dump_indent(aTHX_ level+1, file, |
1306 | "%2d. 0x%"UVxf"<%lu>\n", |
1307 | (int) ix, |
1308 | PTR2UV(ppad[ix]), |
1309 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
1310 | ); |
1311 | } |
1312 | } |
1313 | } |
1314 | |
1315 | |
1316 | |
1317 | /* |
1318 | =for apidoc cv_dump |
1319 | |
1320 | dump the contents of a CV |
1321 | |
1322 | =cut |
1323 | */ |
1324 | |
1325 | #ifdef DEBUGGING |
1326 | STATIC void |
e1ec3a88 |
1327 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 |
1328 | { |
e1ec3a88 |
1329 | const CV *outside = CvOUTSIDE(cv); |
dd2155a4 |
1330 | AV* padlist = CvPADLIST(cv); |
1331 | |
1332 | PerlIO_printf(Perl_debug_log, |
1333 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
1334 | title, |
1335 | PTR2UV(cv), |
1336 | (CvANON(cv) ? "ANON" |
71f882da |
1337 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 |
1338 | : (cv == PL_main_cv) ? "MAIN" |
1339 | : CvUNIQUE(cv) ? "UNIQUE" |
1340 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
1341 | PTR2UV(outside), |
1342 | (!outside ? "null" |
1343 | : CvANON(outside) ? "ANON" |
1344 | : (outside == PL_main_cv) ? "MAIN" |
1345 | : CvUNIQUE(outside) ? "UNIQUE" |
1346 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
1347 | |
1348 | PerlIO_printf(Perl_debug_log, |
1349 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
1350 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
1351 | } |
1352 | #endif /* DEBUGGING */ |
1353 | |
1354 | |
1355 | |
1356 | |
1357 | |
1358 | /* |
1359 | =for apidoc cv_clone |
1360 | |
1361 | Clone a CV: make a new CV which points to the same code etc, but which |
1362 | has a newly-created pad built by copying the prototype pad and capturing |
1363 | any outer lexicals. |
1364 | |
1365 | =cut |
1366 | */ |
1367 | |
1368 | CV * |
1369 | Perl_cv_clone(pTHX_ CV *proto) |
1370 | { |
dd2155a4 |
1371 | I32 ix; |
1372 | AV* protopadlist = CvPADLIST(proto); |
e1ec3a88 |
1373 | const AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); |
1374 | const AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); |
dd2155a4 |
1375 | SV** pname = AvARRAY(protopad_name); |
1376 | SV** ppad = AvARRAY(protopad); |
e1ec3a88 |
1377 | const I32 fname = AvFILLp(protopad_name); |
1378 | const I32 fpad = AvFILLp(protopad); |
dd2155a4 |
1379 | AV* comppadlist; |
1380 | CV* cv; |
b5c19bd7 |
1381 | SV** outpad; |
1382 | CV* outside; |
71f882da |
1383 | long depth; |
dd2155a4 |
1384 | |
1385 | assert(!CvUNIQUE(proto)); |
1386 | |
71f882da |
1387 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1388 | * to a prototype; we instead want the cloned parent who called us. |
1389 | * Note that in general for formats, CvOUTSIDE != find_runcv */ |
1390 | |
1391 | outside = CvOUTSIDE(proto); |
1392 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) |
1393 | outside = find_runcv(NULL); |
1394 | depth = CvDEPTH(outside); |
1395 | assert(depth || SvTYPE(proto) == SVt_PVFM); |
1396 | if (!depth) |
1397 | depth = 1; |
b5c19bd7 |
1398 | assert(CvPADLIST(outside)); |
1399 | |
dd2155a4 |
1400 | ENTER; |
1401 | SAVESPTR(PL_compcv); |
1402 | |
1403 | cv = PL_compcv = (CV*)NEWSV(1104, 0); |
1404 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
7dafbf52 |
1405 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 |
1406 | CvCLONED_on(cv); |
1407 | |
dd2155a4 |
1408 | #ifdef USE_ITHREADS |
1409 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) |
1410 | : savepv(CvFILE(proto)); |
1411 | #else |
1412 | CvFILE(cv) = CvFILE(proto); |
1413 | #endif |
1414 | CvGV(cv) = CvGV(proto); |
1415 | CvSTASH(cv) = CvSTASH(proto); |
b34c0dd4 |
1416 | OP_REFCNT_LOCK; |
dd2155a4 |
1417 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 |
1418 | OP_REFCNT_UNLOCK; |
dd2155a4 |
1419 | CvSTART(cv) = CvSTART(proto); |
b5c19bd7 |
1420 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1421 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
dd2155a4 |
1422 | |
1423 | if (SvPOK(proto)) |
1424 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); |
1425 | |
1426 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); |
1427 | |
b5c19bd7 |
1428 | av_fill(PL_comppad, fpad); |
dd2155a4 |
1429 | for (ix = fname; ix >= 0; ix--) |
1430 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
1431 | |
dd2155a4 |
1432 | PL_curpad = AvARRAY(PL_comppad); |
1433 | |
71f882da |
1434 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 |
1435 | |
dd2155a4 |
1436 | for (ix = fpad; ix > 0; ix--) { |
1437 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
71f882da |
1438 | SV *sv = Nullsv; |
1439 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
b5c19bd7 |
1440 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
71f882da |
1441 | sv = outpad[(I32)SvNVX(namesv)]; |
1442 | assert(sv); |
1443 | /* formats may have an inactive parent */ |
1444 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { |
1445 | if (ckWARN(WARN_CLOSURE)) |
1446 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
1447 | "Variable \"%s\" is not available", SvPVX(namesv)); |
1448 | sv = Nullsv; |
1449 | } |
1450 | else { |
1451 | assert(!SvPADSTALE(sv)); |
1452 | sv = SvREFCNT_inc(sv); |
1453 | } |
dd2155a4 |
1454 | } |
71f882da |
1455 | if (!sv) { |
e1ec3a88 |
1456 | const char sigil = SvPVX(namesv)[0]; |
1457 | if (sigil == '&') |
dd2155a4 |
1458 | sv = SvREFCNT_inc(ppad[ix]); |
e1ec3a88 |
1459 | else if (sigil == '@') |
dd2155a4 |
1460 | sv = (SV*)newAV(); |
e1ec3a88 |
1461 | else if (sigil == '%') |
dd2155a4 |
1462 | sv = (SV*)newHV(); |
1463 | else |
1464 | sv = NEWSV(0, 0); |
235cc2e3 |
1465 | SvPADMY_on(sv); |
dd2155a4 |
1466 | } |
1467 | } |
1468 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
71f882da |
1469 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 |
1470 | } |
1471 | else { |
b5c19bd7 |
1472 | sv = NEWSV(0, 0); |
dd2155a4 |
1473 | SvPADTMP_on(sv); |
dd2155a4 |
1474 | } |
71f882da |
1475 | PL_curpad[ix] = sv; |
dd2155a4 |
1476 | } |
1477 | |
dd2155a4 |
1478 | DEBUG_Xv( |
1479 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
1480 | cv_dump(outside, "Outside"); |
1481 | cv_dump(proto, "Proto"); |
1482 | cv_dump(cv, "To"); |
1483 | ); |
1484 | |
1485 | LEAVE; |
1486 | |
1487 | if (CvCONST(cv)) { |
b5c19bd7 |
1488 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1489 | * The prototype was marked as a candiate for const-ization, |
1490 | * so try to grab the current const value, and if successful, |
1491 | * turn into a const sub: |
1492 | */ |
dd2155a4 |
1493 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 |
1494 | if (const_sv) { |
1495 | SvREFCNT_dec(cv); |
1496 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); |
1497 | } |
1498 | else { |
1499 | CvCONST_off(cv); |
1500 | } |
dd2155a4 |
1501 | } |
1502 | |
1503 | return cv; |
1504 | } |
1505 | |
1506 | |
1507 | /* |
1508 | =for apidoc pad_fixup_inner_anons |
1509 | |
1510 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
7dafbf52 |
1511 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1512 | moved to a pre-existing CV struct. |
dd2155a4 |
1513 | |
1514 | =cut |
1515 | */ |
1516 | |
1517 | void |
1518 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
1519 | { |
1520 | I32 ix; |
1521 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
1522 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
1523 | SV **namepad = AvARRAY(comppad_name); |
1524 | SV **curpad = AvARRAY(comppad); |
1525 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
e1ec3a88 |
1526 | const SV *namesv = namepad[ix]; |
dd2155a4 |
1527 | if (namesv && namesv != &PL_sv_undef |
1528 | && *SvPVX(namesv) == '&') |
1529 | { |
1530 | CV *innercv = (CV*)curpad[ix]; |
7dafbf52 |
1531 | assert(CvWEAKOUTSIDE(innercv)); |
1532 | assert(CvOUTSIDE(innercv) == old_cv); |
1533 | CvOUTSIDE(innercv) = new_cv; |
dd2155a4 |
1534 | } |
1535 | } |
1536 | } |
1537 | |
7dafbf52 |
1538 | |
dd2155a4 |
1539 | /* |
1540 | =for apidoc pad_push |
1541 | |
1542 | Push a new pad frame onto the padlist, unless there's already a pad at |
26019298 |
1543 | this depth, in which case don't bother creating a new one. Then give |
1544 | the new pad an @_ in slot zero. |
dd2155a4 |
1545 | |
1546 | =cut |
1547 | */ |
1548 | |
1549 | void |
26019298 |
1550 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 |
1551 | { |
1552 | if (depth <= AvFILLp(padlist)) |
1553 | return; |
1554 | |
1555 | { |
1556 | SV** svp = AvARRAY(padlist); |
1557 | AV *newpad = newAV(); |
1558 | SV **oldpad = AvARRAY(svp[depth-1]); |
1559 | I32 ix = AvFILLp((AV*)svp[1]); |
e1ec3a88 |
1560 | const I32 names_fill = AvFILLp((AV*)svp[0]); |
dd2155a4 |
1561 | SV** names = AvARRAY(svp[0]); |
26019298 |
1562 | AV *av; |
1563 | |
dd2155a4 |
1564 | for ( ;ix > 0; ix--) { |
1565 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
26019298 |
1566 | const char sigil = SvPVX(names[ix])[0]; |
1567 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') { |
dd2155a4 |
1568 | /* outer lexical or anon code */ |
1569 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
1570 | } |
1571 | else { /* our own lexical */ |
26019298 |
1572 | SV *sv; |
1573 | if (sigil == '@') |
1574 | sv = (SV*)newAV(); |
1575 | else if (sigil == '%') |
1576 | sv = (SV*)newHV(); |
dd2155a4 |
1577 | else |
26019298 |
1578 | sv = NEWSV(0, 0); |
1579 | av_store(newpad, ix, sv); |
dd2155a4 |
1580 | SvPADMY_on(sv); |
1581 | } |
1582 | } |
1583 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
26019298 |
1584 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
dd2155a4 |
1585 | } |
1586 | else { |
1587 | /* save temporaries on recursion? */ |
26019298 |
1588 | SV *sv = NEWSV(0, 0); |
1589 | av_store(newpad, ix, sv); |
dd2155a4 |
1590 | SvPADTMP_on(sv); |
1591 | } |
1592 | } |
26019298 |
1593 | av = newAV(); |
1594 | av_extend(av, 0); |
1595 | av_store(newpad, 0, (SV*)av); |
1596 | AvFLAGS(av) = AVf_REIFY; |
1597 | |
dd2155a4 |
1598 | av_store(padlist, depth, (SV*)newpad); |
1599 | AvFILLp(padlist) = depth; |
1600 | } |
1601 | } |