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1 | /* pad.c |
2 | * |
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3 | * Copyright (C) 2002,2003 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 | |
25 | =for apidoc m|AV *|CvPADLIST|CV *cv |
26 | CV's can have CvPADLIST(cv) set to point to an AV. |
27 | |
28 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're |
29 | not callable at will and are always thrown away after the eval"" is done |
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30 | executing). Require'd files are simply evals without any outer lexical |
31 | scope. |
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32 | |
33 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, |
34 | but that is really the callers pad (a slot of which is allocated by |
35 | every entersub). |
36 | |
37 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items |
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38 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
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39 | The items in the AV are not SVs as for a normal AV, but other AVs: |
40 | |
41 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather |
42 | the "static type information" for lexicals. |
43 | |
44 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that |
45 | depth of recursion into the CV. |
46 | The 0'th slot of a frame AV is an AV which is @_. |
47 | other entries are storage for variables and op targets. |
48 | |
49 | During compilation: |
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50 | C<PL_comppad_name> is set to the names AV. |
51 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. |
52 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). |
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53 | |
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54 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
55 | frame of the currently executing sub. |
56 | |
57 | Iterating over the names AV iterates over all possible pad |
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58 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
59 | &PL_sv_undef "names" (see pad_alloc()). |
60 | |
61 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. |
62 | The rest are op targets/GVs/constants which are statically allocated |
63 | or resolved at compile time. These don't have names by which they |
64 | can be looked up from Perl code at run time through eval"" like |
65 | my/our variables can be. Since they can't be looked up by "name" |
66 | but only by their index allocated at compile time (which is usually |
67 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. |
68 | |
69 | The SVs in the names AV have their PV being the name of the variable. |
70 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is |
71 | valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the |
72 | type. For C<our> lexicals, the type is SVt_PVGV, and GvSTASH points at the |
73 | stash of the associated global (so that duplicate C<our> delarations in the |
74 | same package can be detected). SvCUR is sometimes hijacked to |
75 | store the generation number during compilation. |
76 | |
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77 | If SvFAKE is set on the name SV, then that slot in the frame AV is |
78 | a REFCNT'ed reference to a lexical from "outside". In this case, |
79 | the name SV does not use NVX and IVX to store a cop_seq range, since it is |
80 | in scope throughout. Instead IVX stores some flags containing info about |
81 | the real lexical (is it declared in an anon, and is it capable of being |
82 | instantiated multiple times?), and for fake ANONs, NVX contains the index |
83 | within the parent's pad where the lexical's value is stored, to make |
84 | cloning quicker. |
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85 | |
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86 | If the 'name' is '&' the corresponding entry in frame AV |
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87 | is a CV representing a possible closure. |
88 | (SvFAKE and name of '&' is not a meaningful combination currently but could |
89 | become so if C<my sub foo {}> is implemented.) |
90 | |
71f882da |
91 | Note that formats are treated as anon subs, and are cloned each time |
92 | write is called (if necessary). |
93 | |
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94 | The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed, |
95 | and set on scope exit. This allows the 'Variable $x is not available' warning |
96 | to be generated in evals, such as |
97 | |
98 | { my $x = 1; sub f { eval '$x'} } f(); |
99 | |
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100 | =cut |
101 | */ |
102 | |
103 | |
104 | #include "EXTERN.h" |
105 | #define PERL_IN_PAD_C |
106 | #include "perl.h" |
107 | |
108 | |
109 | #define PAD_MAX 999999999 |
110 | |
111 | |
112 | |
113 | /* |
114 | =for apidoc pad_new |
115 | |
116 | Create a new compiling padlist, saving and updating the various global |
117 | vars at the same time as creating the pad itself. The following flags |
118 | can be OR'ed together: |
119 | |
120 | padnew_CLONE this pad is for a cloned CV |
121 | padnew_SAVE save old globals |
122 | padnew_SAVESUB also save extra stuff for start of sub |
123 | |
124 | =cut |
125 | */ |
126 | |
127 | PADLIST * |
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128 | Perl_pad_new(pTHX_ int flags) |
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129 | { |
130 | AV *padlist, *padname, *pad, *a0; |
131 | |
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132 | ASSERT_CURPAD_LEGAL("pad_new"); |
133 | |
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134 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
135 | * vars (based on flags) rather than storing vals + addresses for |
136 | * each individually. Also see pad_block_start. |
137 | * XXX DAPM Try to see whether all these conditionals are required |
138 | */ |
139 | |
140 | /* save existing state, ... */ |
141 | |
142 | if (flags & padnew_SAVE) { |
3979c56f |
143 | SAVECOMPPAD(); |
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144 | SAVESPTR(PL_comppad_name); |
145 | if (! (flags & padnew_CLONE)) { |
146 | SAVEI32(PL_padix); |
147 | SAVEI32(PL_comppad_name_fill); |
148 | SAVEI32(PL_min_intro_pending); |
149 | SAVEI32(PL_max_intro_pending); |
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150 | SAVEI32(PL_cv_has_eval); |
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151 | if (flags & padnew_SAVESUB) { |
152 | SAVEI32(PL_pad_reset_pending); |
153 | } |
154 | } |
155 | } |
156 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be |
157 | * saved - check at some pt that this is okay */ |
158 | |
159 | /* ... create new pad ... */ |
160 | |
161 | padlist = newAV(); |
162 | padname = newAV(); |
163 | pad = newAV(); |
164 | |
165 | if (flags & padnew_CLONE) { |
166 | /* XXX DAPM I dont know why cv_clone needs it |
167 | * doing differently yet - perhaps this separate branch can be |
168 | * dispensed with eventually ??? |
169 | */ |
170 | |
171 | a0 = newAV(); /* will be @_ */ |
172 | av_extend(a0, 0); |
173 | av_store(pad, 0, (SV*)a0); |
174 | AvFLAGS(a0) = AVf_REIFY; |
175 | } |
176 | else { |
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177 | av_store(pad, 0, Nullsv); |
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178 | } |
179 | |
180 | AvREAL_off(padlist); |
181 | av_store(padlist, 0, (SV*)padname); |
182 | av_store(padlist, 1, (SV*)pad); |
183 | |
184 | /* ... then update state variables */ |
185 | |
186 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); |
187 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); |
188 | PL_curpad = AvARRAY(PL_comppad); |
189 | |
190 | if (! (flags & padnew_CLONE)) { |
191 | PL_comppad_name_fill = 0; |
192 | PL_min_intro_pending = 0; |
193 | PL_padix = 0; |
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194 | PL_cv_has_eval = 0; |
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195 | } |
196 | |
197 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
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198 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
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199 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
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200 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
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201 | PTR2UV(padname), (UV)flags |
202 | ) |
203 | ); |
204 | |
205 | return (PADLIST*)padlist; |
206 | } |
207 | |
208 | /* |
209 | =for apidoc pad_undef |
210 | |
211 | Free the padlist associated with a CV. |
212 | If parts of it happen to be current, we null the relevant |
213 | PL_*pad* global vars so that we don't have any dangling references left. |
214 | We also repoint the CvOUTSIDE of any about-to-be-orphaned |
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215 | inner subs to the outer of this cv. |
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216 | |
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217 | (This function should really be called pad_free, but the name was already |
218 | taken) |
219 | |
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220 | =cut |
221 | */ |
222 | |
223 | void |
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224 | Perl_pad_undef(pTHX_ CV* cv) |
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225 | { |
226 | I32 ix; |
227 | PADLIST *padlist = CvPADLIST(cv); |
228 | |
229 | if (!padlist) |
230 | return; |
231 | if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ |
232 | return; |
233 | |
234 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
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235 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", |
236 | PTR2UV(cv), PTR2UV(padlist)) |
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237 | ); |
238 | |
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239 | /* detach any '&' anon children in the pad; if afterwards they |
240 | * are still live, fix up their CvOUTSIDEs to point to our outside, |
241 | * bypassing us. */ |
242 | /* XXX DAPM for efficiency, we should only do this if we know we have |
243 | * children, or integrate this loop with general cleanup */ |
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244 | |
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245 | if (!PL_dirty) { /* don't bother during global destruction */ |
246 | CV *outercv = CvOUTSIDE(cv); |
247 | U32 seq = CvOUTSIDE_SEQ(cv); |
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248 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
249 | SV **namepad = AvARRAY(comppad_name); |
250 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
251 | SV **curpad = AvARRAY(comppad); |
252 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
253 | SV *namesv = namepad[ix]; |
254 | if (namesv && namesv != &PL_sv_undef |
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255 | && *SvPVX(namesv) == '&') |
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256 | { |
257 | CV *innercv = (CV*)curpad[ix]; |
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258 | namepad[ix] = Nullsv; |
259 | SvREFCNT_dec(namesv); |
260 | curpad[ix] = Nullsv; |
261 | SvREFCNT_dec(innercv); |
262 | if (SvREFCNT(innercv) /* in use, not just a prototype */ |
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263 | && CvOUTSIDE(innercv) == cv) |
264 | { |
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265 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 |
266 | /* don't relink to grandfather if he's being freed */ |
267 | if (outercv && SvREFCNT(outercv)) { |
268 | CvWEAKOUTSIDE_off(innercv); |
269 | CvOUTSIDE(innercv) = outercv; |
270 | CvOUTSIDE_SEQ(innercv) = seq; |
271 | SvREFCNT_inc(outercv); |
272 | } |
273 | else { |
274 | CvOUTSIDE(innercv) = Nullcv; |
275 | } |
276 | |
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277 | } |
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278 | |
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279 | } |
280 | } |
281 | } |
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282 | |
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283 | ix = AvFILLp(padlist); |
284 | while (ix >= 0) { |
285 | SV* sv = AvARRAY(padlist)[ix--]; |
286 | if (!sv) |
287 | continue; |
288 | if (sv == (SV*)PL_comppad_name) |
289 | PL_comppad_name = Nullav; |
290 | else if (sv == (SV*)PL_comppad) { |
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291 | PL_comppad = Null(PAD*); |
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292 | PL_curpad = Null(SV**); |
293 | } |
294 | SvREFCNT_dec(sv); |
295 | } |
296 | SvREFCNT_dec((SV*)CvPADLIST(cv)); |
297 | CvPADLIST(cv) = Null(PADLIST*); |
298 | } |
299 | |
300 | |
301 | |
302 | |
303 | /* |
304 | =for apidoc pad_add_name |
305 | |
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306 | Create a new name and associated PADMY SV in the current pad; return the |
307 | offset. |
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308 | If C<typestash> is valid, the name is for a typed lexical; set the |
309 | name's stash to that value. |
310 | If C<ourstash> is valid, it's an our lexical, set the name's |
311 | GvSTASH to that value |
312 | |
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313 | If fake, it means we're cloning an existing entry |
314 | |
315 | =cut |
316 | */ |
317 | |
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318 | PADOFFSET |
319 | Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) |
320 | { |
321 | PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
322 | SV* namesv = NEWSV(1102, 0); |
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323 | |
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324 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
325 | |
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326 | |
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327 | sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); |
328 | sv_setpv(namesv, name); |
329 | |
330 | if (typestash) { |
331 | SvFLAGS(namesv) |= SVpad_TYPED; |
332 | SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); |
333 | } |
334 | if (ourstash) { |
335 | SvFLAGS(namesv) |= SVpad_OUR; |
336 | GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); |
337 | } |
338 | |
339 | av_store(PL_comppad_name, offset, namesv); |
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340 | if (fake) { |
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341 | SvFAKE_on(namesv); |
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342 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
343 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); |
344 | } |
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345 | else { |
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346 | /* not yet introduced */ |
347 | SvNVX(namesv) = (NV)PAD_MAX; /* min */ |
348 | SvIVX(namesv) = 0; /* max */ |
349 | |
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350 | if (!PL_min_intro_pending) |
351 | PL_min_intro_pending = offset; |
352 | PL_max_intro_pending = offset; |
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353 | /* if it's not a simple scalar, replace with an AV or HV */ |
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354 | /* XXX DAPM since slot has been allocated, replace |
355 | * av_store with PL_curpad[offset] ? */ |
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356 | if (*name == '@') |
357 | av_store(PL_comppad, offset, (SV*)newAV()); |
358 | else if (*name == '%') |
359 | av_store(PL_comppad, offset, (SV*)newHV()); |
360 | SvPADMY_on(PL_curpad[offset]); |
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361 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
362 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", |
363 | (long)offset, name, PTR2UV(PL_curpad[offset]))); |
dd2155a4 |
364 | } |
365 | |
366 | return offset; |
367 | } |
368 | |
369 | |
370 | |
371 | |
372 | /* |
373 | =for apidoc pad_alloc |
374 | |
375 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto |
376 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards |
377 | for a slot which has no name and and no active value. |
378 | |
379 | =cut |
380 | */ |
381 | |
382 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), |
383 | * or at least rationalise ??? */ |
384 | |
385 | |
386 | PADOFFSET |
387 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) |
388 | { |
389 | SV *sv; |
390 | I32 retval; |
391 | |
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392 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
393 | |
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394 | if (AvARRAY(PL_comppad) != PL_curpad) |
395 | Perl_croak(aTHX_ "panic: pad_alloc"); |
396 | if (PL_pad_reset_pending) |
397 | pad_reset(); |
398 | if (tmptype & SVs_PADMY) { |
235cc2e3 |
399 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 |
400 | retval = AvFILLp(PL_comppad); |
401 | } |
402 | else { |
403 | SV **names = AvARRAY(PL_comppad_name); |
404 | SSize_t names_fill = AvFILLp(PL_comppad_name); |
405 | for (;;) { |
406 | /* |
407 | * "foreach" index vars temporarily become aliases to non-"my" |
408 | * values. Thus we must skip, not just pad values that are |
409 | * marked as current pad values, but also those with names. |
410 | */ |
411 | /* HVDS why copy to sv here? we don't seem to use it */ |
412 | if (++PL_padix <= names_fill && |
413 | (sv = names[PL_padix]) && sv != &PL_sv_undef) |
414 | continue; |
415 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); |
416 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && |
417 | !IS_PADGV(sv) && !IS_PADCONST(sv)) |
418 | break; |
419 | } |
420 | retval = PL_padix; |
421 | } |
422 | SvFLAGS(sv) |= tmptype; |
423 | PL_curpad = AvARRAY(PL_comppad); |
424 | |
425 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
426 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", |
427 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, |
428 | PL_op_name[optype])); |
429 | return (PADOFFSET)retval; |
430 | } |
431 | |
432 | /* |
433 | =for apidoc pad_add_anon |
434 | |
435 | Add an anon code entry to the current compiling pad |
436 | |
437 | =cut |
438 | */ |
439 | |
440 | PADOFFSET |
441 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) |
442 | { |
443 | PADOFFSET ix; |
444 | SV* name; |
445 | |
446 | name = NEWSV(1106, 0); |
447 | sv_upgrade(name, SVt_PVNV); |
448 | sv_setpvn(name, "&", 1); |
449 | SvIVX(name) = -1; |
450 | SvNVX(name) = 1; |
451 | ix = pad_alloc(op_type, SVs_PADMY); |
452 | av_store(PL_comppad_name, ix, name); |
f3548bdc |
453 | /* XXX DAPM use PL_curpad[] ? */ |
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454 | av_store(PL_comppad, ix, sv); |
455 | SvPADMY_on(sv); |
7dafbf52 |
456 | |
457 | /* to avoid ref loops, we never have parent + child referencing each |
458 | * other simultaneously */ |
459 | if (CvOUTSIDE((CV*)sv)) { |
460 | assert(!CvWEAKOUTSIDE((CV*)sv)); |
461 | CvWEAKOUTSIDE_on((CV*)sv); |
462 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); |
463 | } |
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464 | return ix; |
465 | } |
466 | |
467 | |
468 | |
469 | /* |
470 | =for apidoc pad_check_dup |
471 | |
472 | Check for duplicate declarations: report any of: |
473 | * a my in the current scope with the same name; |
474 | * an our (anywhere in the pad) with the same name and the same stash |
475 | as C<ourstash> |
476 | C<is_our> indicates that the name to check is an 'our' declaration |
477 | |
478 | =cut |
479 | */ |
480 | |
481 | /* XXX DAPM integrate this into pad_add_name ??? */ |
482 | |
483 | void |
484 | Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) |
485 | { |
486 | SV **svp, *sv; |
487 | PADOFFSET top, off; |
488 | |
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489 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
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490 | if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) |
491 | return; /* nothing to check */ |
492 | |
493 | svp = AvARRAY(PL_comppad_name); |
494 | top = AvFILLp(PL_comppad_name); |
495 | /* check the current scope */ |
496 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
497 | * type ? */ |
498 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
499 | if ((sv = svp[off]) |
500 | && sv != &PL_sv_undef |
ee6cee0c |
501 | && !SvFAKE(sv) |
dd2155a4 |
502 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
503 | && (!is_our |
504 | || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) |
505 | && strEQ(name, SvPVX(sv))) |
506 | { |
507 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
508 | "\"%s\" variable %s masks earlier declaration in same %s", |
509 | (is_our ? "our" : "my"), |
510 | name, |
511 | (SvIVX(sv) == PAD_MAX ? "scope" : "statement")); |
512 | --off; |
513 | break; |
514 | } |
515 | } |
516 | /* check the rest of the pad */ |
517 | if (is_our) { |
518 | do { |
519 | if ((sv = svp[off]) |
520 | && sv != &PL_sv_undef |
ee6cee0c |
521 | && !SvFAKE(sv) |
dd2155a4 |
522 | && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) |
523 | && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) |
524 | && strEQ(name, SvPVX(sv))) |
525 | { |
526 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
527 | "\"our\" variable %s redeclared", name); |
528 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
529 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
530 | break; |
531 | } |
532 | } while ( off-- > 0 ); |
533 | } |
534 | } |
535 | |
536 | |
dd2155a4 |
537 | /* |
538 | =for apidoc pad_findmy |
539 | |
540 | Given a lexical name, try to find its offset, first in the current pad, |
541 | or failing that, in the pads of any lexically enclosing subs (including |
542 | the complications introduced by eval). If the name is found in an outer pad, |
543 | then a fake entry is added to the current pad. |
544 | Returns the offset in the current pad, or NOT_IN_PAD on failure. |
545 | |
546 | =cut |
547 | */ |
548 | |
549 | PADOFFSET |
550 | Perl_pad_findmy(pTHX_ char *name) |
551 | { |
b5c19bd7 |
552 | SV *out_sv; |
553 | int out_flags; |
929a0744 |
554 | I32 offset; |
555 | AV *nameav; |
556 | SV **name_svp; |
dd2155a4 |
557 | |
929a0744 |
558 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
b5c19bd7 |
559 | Null(SV**), &out_sv, &out_flags); |
929a0744 |
560 | if (offset != NOT_IN_PAD) |
561 | return offset; |
562 | |
563 | /* look for an our that's being introduced; this allows |
564 | * our $foo = 0 unless defined $foo; |
565 | * to not give a warning. (Yes, this is a hack) */ |
566 | |
567 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; |
568 | name_svp = AvARRAY(nameav); |
569 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
570 | SV *namesv = name_svp[offset]; |
571 | if (namesv && namesv != &PL_sv_undef |
572 | && !SvFAKE(namesv) |
573 | && (SvFLAGS(namesv) & SVpad_OUR) |
574 | && strEQ(SvPVX(namesv), name) |
4cf4a199 |
575 | && U_32(SvNVX(namesv)) == PAD_MAX /* min */ |
929a0744 |
576 | ) |
577 | return offset; |
578 | } |
579 | return NOT_IN_PAD; |
dd2155a4 |
580 | } |
581 | |
582 | |
dd2155a4 |
583 | /* |
584 | =for apidoc pad_findlex |
585 | |
586 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
b5c19bd7 |
587 | in the inner pads if it's found in an outer one. |
588 | |
589 | Returns the offset in the bottom pad of the lex or the fake lex. |
590 | cv is the CV in which to start the search, and seq is the current cop_seq |
591 | to match against. If warn is true, print appropriate warnings. The out_* |
592 | vars return values, and so are pointers to where the returned values |
593 | should be stored. out_capture, if non-null, requests that the innermost |
594 | instance of the lexical is captured; out_name_sv is set to the innermost |
595 | matched namesv or fake namesv; out_flags returns the flags normally |
596 | associated with the IVX field of a fake namesv. |
597 | |
598 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, |
599 | then comes back down, adding fake entries as it goes. It has to be this way |
600 | because fake namesvs in anon protoypes have to store in NVX the index into |
601 | the parent pad. |
dd2155a4 |
602 | |
603 | =cut |
604 | */ |
605 | |
b5c19bd7 |
606 | /* Flags set in the SvIVX field of FAKE namesvs */ |
607 | |
608 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ |
609 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ |
610 | |
611 | /* the CV has finished being compiled. This is not a sufficient test for |
612 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ |
613 | #define CvCOMPILED(cv) CvROOT(cv) |
614 | |
71f882da |
615 | /* the CV does late binding of its lexicals */ |
616 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) |
617 | |
b5c19bd7 |
618 | |
dd2155a4 |
619 | STATIC PADOFFSET |
b5c19bd7 |
620 | S_pad_findlex(pTHX_ char *name, CV* cv, U32 seq, int warn, |
621 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 |
622 | { |
b5c19bd7 |
623 | I32 offset, new_offset; |
624 | SV *new_capture; |
625 | SV **new_capturep; |
626 | AV *padlist = CvPADLIST(cv); |
dd2155a4 |
627 | |
b5c19bd7 |
628 | *out_flags = 0; |
a3985cdc |
629 | |
b5c19bd7 |
630 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
631 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", |
632 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); |
dd2155a4 |
633 | |
b5c19bd7 |
634 | /* first, search this pad */ |
dd2155a4 |
635 | |
b5c19bd7 |
636 | if (padlist) { /* not an undef CV */ |
637 | I32 fake_offset = 0; |
638 | AV *nameav = (AV*)AvARRAY(padlist)[0]; |
639 | SV **name_svp = AvARRAY(nameav); |
ee6cee0c |
640 | |
b5c19bd7 |
641 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
642 | SV *namesv = name_svp[offset]; |
643 | if (namesv && namesv != &PL_sv_undef |
644 | && strEQ(SvPVX(namesv), name)) |
645 | { |
646 | if (SvFAKE(namesv)) |
647 | fake_offset = offset; /* in case we don't find a real one */ |
4cf4a199 |
648 | else if ( seq > U_32(SvNVX(namesv)) /* min */ |
649 | && seq <= (U32)SvIVX(namesv)) /* max */ |
b5c19bd7 |
650 | break; |
ee6cee0c |
651 | } |
652 | } |
653 | |
b5c19bd7 |
654 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
655 | if (offset > 0) { /* not fake */ |
656 | fake_offset = 0; |
657 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
658 | |
659 | /* set PAD_FAKELEX_MULTI if this lex can have multiple |
660 | * instances. For now, we just test !CvUNIQUE(cv), but |
661 | * ideally, we should detect my's declared within loops |
662 | * etc - this would allow a wider range of 'not stayed |
663 | * shared' warnings. We also treated alreadly-compiled |
664 | * lexes as not multi as viewed from evals. */ |
665 | |
666 | *out_flags = CvANON(cv) ? |
667 | PAD_FAKELEX_ANON : |
668 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) |
669 | ? PAD_FAKELEX_MULTI : 0; |
670 | |
671 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
672 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", |
4cf4a199 |
673 | PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), |
b5c19bd7 |
674 | (long)SvIVX(*out_name_sv))); |
675 | } |
676 | else { /* fake match */ |
677 | offset = fake_offset; |
678 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
679 | *out_flags = SvIVX(*out_name_sv); |
680 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
19a5c512 |
681 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 |
682 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
683 | (unsigned long)SvNVX(*out_name_sv) |
684 | )); |
685 | } |
dd2155a4 |
686 | |
b5c19bd7 |
687 | /* return the lex? */ |
dd2155a4 |
688 | |
b5c19bd7 |
689 | if (out_capture) { |
dd2155a4 |
690 | |
b5c19bd7 |
691 | /* our ? */ |
692 | if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) { |
693 | *out_capture = Nullsv; |
694 | return offset; |
695 | } |
ee6cee0c |
696 | |
b5c19bd7 |
697 | /* trying to capture from an anon prototype? */ |
698 | if (CvCOMPILED(cv) |
699 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) |
700 | : *out_flags & PAD_FAKELEX_ANON) |
701 | { |
702 | if (warn && ckWARN(WARN_CLOSURE)) |
703 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
704 | "Variable \"%s\" is not available", name); |
705 | *out_capture = Nullsv; |
706 | } |
ee6cee0c |
707 | |
b5c19bd7 |
708 | /* real value */ |
709 | else { |
710 | int newwarn = warn; |
711 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) |
712 | && warn && ckWARN(WARN_CLOSURE)) { |
713 | newwarn = 0; |
714 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
715 | "Variable \"%s\" will not stay shared", name); |
716 | } |
dd2155a4 |
717 | |
b5c19bd7 |
718 | if (fake_offset && CvANON(cv) |
719 | && CvCLONE(cv) &&!CvCLONED(cv)) |
720 | { |
721 | SV *n; |
722 | /* not yet caught - look further up */ |
723 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
724 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", |
725 | PTR2UV(cv))); |
726 | n = *out_name_sv; |
727 | pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), |
728 | newwarn, out_capture, out_name_sv, out_flags); |
729 | *out_name_sv = n; |
730 | return offset; |
dd2155a4 |
731 | } |
b5c19bd7 |
732 | |
733 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ |
734 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; |
735 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
736 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", |
19a5c512 |
737 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 |
738 | |
739 | if (SvPADSTALE(*out_capture)) { |
740 | if (ckWARN(WARN_CLOSURE)) |
ee6cee0c |
741 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 |
742 | "Variable \"%s\" is not available", name); |
743 | *out_capture = Nullsv; |
dd2155a4 |
744 | } |
745 | } |
b5c19bd7 |
746 | if (!*out_capture) { |
747 | if (*name == '@') |
748 | *out_capture = sv_2mortal((SV*)newAV()); |
749 | else if (*name == '%') |
750 | *out_capture = sv_2mortal((SV*)newHV()); |
751 | else |
752 | *out_capture = sv_newmortal(); |
753 | } |
dd2155a4 |
754 | } |
b5c19bd7 |
755 | |
756 | return offset; |
ee6cee0c |
757 | } |
b5c19bd7 |
758 | } |
759 | |
760 | /* it's not in this pad - try above */ |
761 | |
762 | if (!CvOUTSIDE(cv)) |
763 | return NOT_IN_PAD; |
764 | |
765 | /* out_capture non-null means caller wants us to capture lex; in |
71f882da |
766 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 |
767 | new_capturep = out_capture ? out_capture : |
71f882da |
768 | CvLATE(cv) ? Null(SV**) : &new_capture; |
b5c19bd7 |
769 | |
770 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, |
771 | new_capturep, out_name_sv, out_flags); |
772 | if (offset == NOT_IN_PAD) |
773 | return NOT_IN_PAD; |
774 | |
775 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
776 | |
777 | /* don't add new fake entries (via eval) to CVs that we have already |
778 | * finished compiling, or to undef CVs */ |
779 | if (CvCOMPILED(cv) || !padlist) |
780 | return 0; /* this dummy (and invalid) value isnt used by the caller */ |
781 | |
782 | { |
783 | SV *new_namesv; |
784 | AV *ocomppad_name = PL_comppad_name; |
785 | PAD *ocomppad = PL_comppad; |
786 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
787 | PL_comppad = (AV*)AvARRAY(padlist)[1]; |
788 | PL_curpad = AvARRAY(PL_comppad); |
789 | |
790 | new_offset = pad_add_name( |
791 | SvPVX(*out_name_sv), |
792 | (SvFLAGS(*out_name_sv) & SVpad_TYPED) |
793 | ? SvSTASH(*out_name_sv) : Nullhv, |
794 | (SvFLAGS(*out_name_sv) & SVpad_OUR) |
795 | ? GvSTASH(*out_name_sv) : Nullhv, |
796 | 1 /* fake */ |
797 | ); |
798 | |
799 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; |
800 | SvIVX(new_namesv) = *out_flags; |
801 | |
802 | SvNVX(new_namesv) = (NV)0; |
803 | if (SvFLAGS(new_namesv) & SVpad_OUR) { |
804 | /* do nothing */ |
805 | } |
71f882da |
806 | else if (CvLATE(cv)) { |
b5c19bd7 |
807 | /* delayed creation - just note the offset within parent pad */ |
808 | SvNVX(new_namesv) = (NV)offset; |
809 | CvCLONE_on(cv); |
810 | } |
811 | else { |
812 | /* immediate creation - capture outer value right now */ |
813 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); |
814 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
815 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", |
816 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); |
dd2155a4 |
817 | } |
b5c19bd7 |
818 | *out_name_sv = new_namesv; |
819 | *out_flags = SvIVX(new_namesv); |
820 | |
821 | PL_comppad_name = ocomppad_name; |
822 | PL_comppad = ocomppad; |
823 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **); |
dd2155a4 |
824 | } |
b5c19bd7 |
825 | return new_offset; |
dd2155a4 |
826 | } |
827 | |
b5c19bd7 |
828 | |
dd2155a4 |
829 | /* |
830 | =for apidoc pad_sv |
831 | |
832 | Get the value at offset po in the current pad. |
833 | Use macro PAD_SV instead of calling this function directly. |
834 | |
835 | =cut |
836 | */ |
837 | |
838 | |
839 | SV * |
840 | Perl_pad_sv(pTHX_ PADOFFSET po) |
841 | { |
f3548bdc |
842 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 |
843 | |
dd2155a4 |
844 | if (!po) |
845 | Perl_croak(aTHX_ "panic: pad_sv po"); |
dd2155a4 |
846 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
847 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
848 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 |
849 | ); |
850 | return PL_curpad[po]; |
851 | } |
852 | |
853 | |
854 | /* |
855 | =for apidoc pad_setsv |
856 | |
857 | Set the entry at offset po in the current pad to sv. |
858 | Use the macro PAD_SETSV() rather than calling this function directly. |
859 | |
860 | =cut |
861 | */ |
862 | |
863 | #ifdef DEBUGGING |
864 | void |
865 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
866 | { |
f3548bdc |
867 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 |
868 | |
869 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
870 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
f3548bdc |
871 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 |
872 | ); |
873 | PL_curpad[po] = sv; |
874 | } |
875 | #endif |
876 | |
877 | |
878 | |
879 | /* |
880 | =for apidoc pad_block_start |
881 | |
882 | Update the pad compilation state variables on entry to a new block |
883 | |
884 | =cut |
885 | */ |
886 | |
887 | /* XXX DAPM perhaps: |
888 | * - integrate this in general state-saving routine ??? |
889 | * - combine with the state-saving going on in pad_new ??? |
890 | * - introduce a new SAVE type that does all this in one go ? |
891 | */ |
892 | |
893 | void |
894 | Perl_pad_block_start(pTHX_ int full) |
895 | { |
f3548bdc |
896 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 |
897 | SAVEI32(PL_comppad_name_floor); |
898 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
899 | if (full) |
900 | PL_comppad_name_fill = PL_comppad_name_floor; |
901 | if (PL_comppad_name_floor < 0) |
902 | PL_comppad_name_floor = 0; |
903 | SAVEI32(PL_min_intro_pending); |
904 | SAVEI32(PL_max_intro_pending); |
905 | PL_min_intro_pending = 0; |
906 | SAVEI32(PL_comppad_name_fill); |
907 | SAVEI32(PL_padix_floor); |
908 | PL_padix_floor = PL_padix; |
909 | PL_pad_reset_pending = FALSE; |
910 | } |
911 | |
912 | |
913 | /* |
914 | =for apidoc intro_my |
915 | |
916 | "Introduce" my variables to visible status. |
917 | |
918 | =cut |
919 | */ |
920 | |
921 | U32 |
922 | Perl_intro_my(pTHX) |
923 | { |
924 | SV **svp; |
925 | SV *sv; |
926 | I32 i; |
927 | |
f3548bdc |
928 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 |
929 | if (! PL_min_intro_pending) |
930 | return PL_cop_seqmax; |
931 | |
932 | svp = AvARRAY(PL_comppad_name); |
933 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
ee6cee0c |
934 | if ((sv = svp[i]) && sv != &PL_sv_undef |
935 | && !SvFAKE(sv) && !SvIVX(sv)) |
936 | { |
dd2155a4 |
937 | SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ |
938 | SvNVX(sv) = (NV)PL_cop_seqmax; |
939 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
940 | "Pad intromy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 |
941 | (long)i, SvPVX(sv), |
4cf4a199 |
942 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 |
943 | ); |
944 | } |
945 | } |
946 | PL_min_intro_pending = 0; |
947 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
948 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
949 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); |
950 | |
951 | return PL_cop_seqmax++; |
952 | } |
953 | |
954 | /* |
955 | =for apidoc pad_leavemy |
956 | |
957 | Cleanup at end of scope during compilation: set the max seq number for |
958 | lexicals in this scope and warn of any lexicals that never got introduced. |
959 | |
960 | =cut |
961 | */ |
962 | |
963 | void |
964 | Perl_pad_leavemy(pTHX) |
965 | { |
966 | I32 off; |
967 | SV **svp = AvARRAY(PL_comppad_name); |
968 | SV *sv; |
969 | |
970 | PL_pad_reset_pending = FALSE; |
971 | |
f3548bdc |
972 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 |
973 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
974 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
ee6cee0c |
975 | if ((sv = svp[off]) && sv != &PL_sv_undef |
976 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
dd2155a4 |
977 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
35c1215d |
978 | "%"SVf" never introduced", sv); |
dd2155a4 |
979 | } |
980 | } |
981 | /* "Deintroduce" my variables that are leaving with this scope. */ |
982 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
ee6cee0c |
983 | if ((sv = svp[off]) && sv != &PL_sv_undef |
984 | && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) |
985 | { |
dd2155a4 |
986 | SvIVX(sv) = PL_cop_seqmax; |
987 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
b5c19bd7 |
988 | "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", |
dd2155a4 |
989 | (long)off, SvPVX(sv), |
4cf4a199 |
990 | (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) |
dd2155a4 |
991 | ); |
992 | } |
993 | } |
994 | PL_cop_seqmax++; |
995 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
996 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
997 | } |
998 | |
999 | |
1000 | /* |
1001 | =for apidoc pad_swipe |
1002 | |
1003 | Abandon the tmp in the current pad at offset po and replace with a |
1004 | new one. |
1005 | |
1006 | =cut |
1007 | */ |
1008 | |
1009 | void |
1010 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
1011 | { |
f3548bdc |
1012 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 |
1013 | if (!PL_curpad) |
1014 | return; |
1015 | if (AvARRAY(PL_comppad) != PL_curpad) |
1016 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
1017 | if (!po) |
1018 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
1019 | |
1020 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1021 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
1022 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
1023 | |
1024 | if (PL_curpad[po]) |
1025 | SvPADTMP_off(PL_curpad[po]); |
1026 | if (refadjust) |
1027 | SvREFCNT_dec(PL_curpad[po]); |
1028 | |
1029 | PL_curpad[po] = NEWSV(1107,0); |
1030 | SvPADTMP_on(PL_curpad[po]); |
1031 | if ((I32)po < PL_padix) |
1032 | PL_padix = po - 1; |
1033 | } |
1034 | |
1035 | |
1036 | /* |
1037 | =for apidoc pad_reset |
1038 | |
1039 | Mark all the current temporaries for reuse |
1040 | |
1041 | =cut |
1042 | */ |
1043 | |
1044 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
1045 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
1046 | * on the stack by OPs that use them, there are several ways to get an alias |
1047 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
1048 | * We avoid doing this until we can think of a Better Way. |
1049 | * GSAR 97-10-29 */ |
1050 | void |
1051 | Perl_pad_reset(pTHX) |
1052 | { |
1053 | #ifdef USE_BROKEN_PAD_RESET |
1054 | register I32 po; |
1055 | |
1056 | if (AvARRAY(PL_comppad) != PL_curpad) |
1057 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
1058 | |
1059 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1060 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
1061 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
1062 | (long)PL_padix, (long)PL_padix_floor |
1063 | ) |
1064 | ); |
1065 | |
1066 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
1067 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1068 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
1069 | SvPADTMP_off(PL_curpad[po]); |
1070 | } |
1071 | PL_padix = PL_padix_floor; |
1072 | } |
1073 | #endif |
1074 | PL_pad_reset_pending = FALSE; |
1075 | } |
1076 | |
1077 | |
1078 | /* |
1079 | =for apidoc pad_tidy |
1080 | |
1081 | Tidy up a pad after we've finished compiling it: |
1082 | * remove most stuff from the pads of anonsub prototypes; |
1083 | * give it a @_; |
1084 | * mark tmps as such. |
1085 | |
1086 | =cut |
1087 | */ |
1088 | |
1089 | /* XXX DAPM surely most of this stuff should be done properly |
1090 | * at the right time beforehand, rather than going around afterwards |
1091 | * cleaning up our mistakes ??? |
1092 | */ |
1093 | |
1094 | void |
1095 | Perl_pad_tidy(pTHX_ padtidy_type type) |
1096 | { |
1097 | PADOFFSET ix; |
b5c19bd7 |
1098 | CV *cv; |
dd2155a4 |
1099 | |
f3548bdc |
1100 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 |
1101 | |
1102 | /* If this CV has had any 'eval-capable' ops planted in it |
1103 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any |
1104 | * anon prototypes in the chain of CVs should be marked as cloneable, |
1105 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets |
1106 | * the right CvOUTSIDE. |
1107 | * If running with -d, *any* sub may potentially have an eval |
1108 | * excuted within it. |
1109 | */ |
1110 | |
1111 | if (PL_cv_has_eval || PL_perldb) { |
1112 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1113 | if (cv != PL_compcv && CvCOMPILED(cv)) |
1114 | break; /* no need to mark already-compiled code */ |
1115 | if (CvANON(cv)) { |
1116 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1117 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); |
1118 | CvCLONE_on(cv); |
1119 | } |
1120 | } |
1121 | } |
1122 | |
dd2155a4 |
1123 | /* extend curpad to match namepad */ |
1124 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
1125 | av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); |
1126 | |
1127 | if (type == padtidy_SUBCLONE) { |
1128 | SV **namep = AvARRAY(PL_comppad_name); |
b5c19bd7 |
1129 | |
dd2155a4 |
1130 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1131 | SV *namesv; |
1132 | |
1133 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1134 | continue; |
1135 | /* |
1136 | * The only things that a clonable function needs in its |
b5c19bd7 |
1137 | * pad are anonymous subs. |
dd2155a4 |
1138 | * The rest are created anew during cloning. |
1139 | */ |
1140 | if (!((namesv = namep[ix]) != Nullsv && |
1141 | namesv != &PL_sv_undef && |
b5c19bd7 |
1142 | *SvPVX(namesv) == '&')) |
dd2155a4 |
1143 | { |
1144 | SvREFCNT_dec(PL_curpad[ix]); |
1145 | PL_curpad[ix] = Nullsv; |
1146 | } |
1147 | } |
1148 | } |
1149 | else if (type == padtidy_SUB) { |
1150 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
1151 | AV *av = newAV(); /* Will be @_ */ |
1152 | av_extend(av, 0); |
1153 | av_store(PL_comppad, 0, (SV*)av); |
1154 | AvFLAGS(av) = AVf_REIFY; |
1155 | } |
1156 | |
1157 | /* XXX DAPM rationalise these two similar branches */ |
1158 | |
1159 | if (type == padtidy_SUB) { |
1160 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1161 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
1162 | continue; |
1163 | if (!SvPADMY(PL_curpad[ix])) |
1164 | SvPADTMP_on(PL_curpad[ix]); |
1165 | } |
1166 | } |
1167 | else if (type == padtidy_FORMAT) { |
1168 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1169 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) |
1170 | SvPADTMP_on(PL_curpad[ix]); |
1171 | } |
1172 | } |
f3548bdc |
1173 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 |
1174 | } |
1175 | |
1176 | |
1177 | /* |
1178 | =for apidoc pad_free |
1179 | |
1180 | Free the SV at offet po in the current pad. |
1181 | |
1182 | =cut |
1183 | */ |
1184 | |
1185 | /* XXX DAPM integrate with pad_swipe ???? */ |
1186 | void |
1187 | Perl_pad_free(pTHX_ PADOFFSET po) |
1188 | { |
f3548bdc |
1189 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 |
1190 | if (!PL_curpad) |
1191 | return; |
1192 | if (AvARRAY(PL_comppad) != PL_curpad) |
1193 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
1194 | if (!po) |
1195 | Perl_croak(aTHX_ "panic: pad_free po"); |
1196 | |
1197 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1198 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
1199 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
1200 | ); |
1201 | |
1202 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
1203 | SvPADTMP_off(PL_curpad[po]); |
1204 | #ifdef USE_ITHREADS |
7e736055 |
1205 | /* SV could be a shared hash key (eg bugid #19022) */ |
1206 | if ( |
dd2155a4 |
1207 | #ifdef PERL_COPY_ON_WRITE |
7e736055 |
1208 | !SvIsCOW(PL_curpad[po]) |
1209 | #else |
1210 | !SvFAKE(PL_curpad[po]) |
dd2155a4 |
1211 | #endif |
7e736055 |
1212 | ) |
dd2155a4 |
1213 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 |
1214 | #endif |
1215 | } |
1216 | if ((I32)po < PL_padix) |
1217 | PL_padix = po - 1; |
1218 | } |
1219 | |
1220 | |
1221 | |
1222 | /* |
1223 | =for apidoc do_dump_pad |
1224 | |
1225 | Dump the contents of a padlist |
1226 | |
1227 | =cut |
1228 | */ |
1229 | |
1230 | void |
1231 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
1232 | { |
1233 | AV *pad_name; |
1234 | AV *pad; |
1235 | SV **pname; |
1236 | SV **ppad; |
1237 | SV *namesv; |
1238 | I32 ix; |
1239 | |
1240 | if (!padlist) { |
1241 | return; |
1242 | } |
1243 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); |
1244 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); |
1245 | pname = AvARRAY(pad_name); |
1246 | ppad = AvARRAY(pad); |
1247 | Perl_dump_indent(aTHX_ level, file, |
1248 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
1249 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
1250 | ); |
1251 | |
1252 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
1253 | namesv = pname[ix]; |
1254 | if (namesv && namesv == &PL_sv_undef) { |
1255 | namesv = Nullsv; |
1256 | } |
1257 | if (namesv) { |
ee6cee0c |
1258 | if (SvFAKE(namesv)) |
1259 | Perl_dump_indent(aTHX_ level+1, file, |
b5c19bd7 |
1260 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%x index=%lu\n", |
ee6cee0c |
1261 | (int) ix, |
1262 | PTR2UV(ppad[ix]), |
1263 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
b5c19bd7 |
1264 | SvPVX(namesv), |
1265 | (unsigned long)SvIVX(namesv), |
1266 | (unsigned long)SvNVX(namesv) |
1267 | |
ee6cee0c |
1268 | ); |
1269 | else |
1270 | Perl_dump_indent(aTHX_ level+1, file, |
b5c19bd7 |
1271 | "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", |
ee6cee0c |
1272 | (int) ix, |
1273 | PTR2UV(ppad[ix]), |
1274 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
4cf4a199 |
1275 | (long)U_32(SvNVX(namesv)), |
b5c19bd7 |
1276 | (long)SvIVX(namesv), |
e9d09c08 |
1277 | SvPVX(namesv) |
ee6cee0c |
1278 | ); |
dd2155a4 |
1279 | } |
1280 | else if (full) { |
1281 | Perl_dump_indent(aTHX_ level+1, file, |
1282 | "%2d. 0x%"UVxf"<%lu>\n", |
1283 | (int) ix, |
1284 | PTR2UV(ppad[ix]), |
1285 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
1286 | ); |
1287 | } |
1288 | } |
1289 | } |
1290 | |
1291 | |
1292 | |
1293 | /* |
1294 | =for apidoc cv_dump |
1295 | |
1296 | dump the contents of a CV |
1297 | |
1298 | =cut |
1299 | */ |
1300 | |
1301 | #ifdef DEBUGGING |
1302 | STATIC void |
1303 | S_cv_dump(pTHX_ CV *cv, char *title) |
1304 | { |
1305 | CV *outside = CvOUTSIDE(cv); |
1306 | AV* padlist = CvPADLIST(cv); |
1307 | |
1308 | PerlIO_printf(Perl_debug_log, |
1309 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
1310 | title, |
1311 | PTR2UV(cv), |
1312 | (CvANON(cv) ? "ANON" |
71f882da |
1313 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 |
1314 | : (cv == PL_main_cv) ? "MAIN" |
1315 | : CvUNIQUE(cv) ? "UNIQUE" |
1316 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
1317 | PTR2UV(outside), |
1318 | (!outside ? "null" |
1319 | : CvANON(outside) ? "ANON" |
1320 | : (outside == PL_main_cv) ? "MAIN" |
1321 | : CvUNIQUE(outside) ? "UNIQUE" |
1322 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
1323 | |
1324 | PerlIO_printf(Perl_debug_log, |
1325 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
1326 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
1327 | } |
1328 | #endif /* DEBUGGING */ |
1329 | |
1330 | |
1331 | |
1332 | |
1333 | |
1334 | /* |
1335 | =for apidoc cv_clone |
1336 | |
1337 | Clone a CV: make a new CV which points to the same code etc, but which |
1338 | has a newly-created pad built by copying the prototype pad and capturing |
1339 | any outer lexicals. |
1340 | |
1341 | =cut |
1342 | */ |
1343 | |
1344 | CV * |
1345 | Perl_cv_clone(pTHX_ CV *proto) |
1346 | { |
dd2155a4 |
1347 | I32 ix; |
1348 | AV* protopadlist = CvPADLIST(proto); |
1349 | AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); |
1350 | AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); |
1351 | SV** pname = AvARRAY(protopad_name); |
1352 | SV** ppad = AvARRAY(protopad); |
1353 | I32 fname = AvFILLp(protopad_name); |
1354 | I32 fpad = AvFILLp(protopad); |
1355 | AV* comppadlist; |
1356 | CV* cv; |
b5c19bd7 |
1357 | SV** outpad; |
1358 | CV* outside; |
71f882da |
1359 | long depth; |
dd2155a4 |
1360 | |
1361 | assert(!CvUNIQUE(proto)); |
1362 | |
71f882da |
1363 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1364 | * to a prototype; we instead want the cloned parent who called us. |
1365 | * Note that in general for formats, CvOUTSIDE != find_runcv */ |
1366 | |
1367 | outside = CvOUTSIDE(proto); |
1368 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) |
1369 | outside = find_runcv(NULL); |
1370 | depth = CvDEPTH(outside); |
1371 | assert(depth || SvTYPE(proto) == SVt_PVFM); |
1372 | if (!depth) |
1373 | depth = 1; |
b5c19bd7 |
1374 | assert(CvPADLIST(outside)); |
1375 | |
dd2155a4 |
1376 | ENTER; |
1377 | SAVESPTR(PL_compcv); |
1378 | |
1379 | cv = PL_compcv = (CV*)NEWSV(1104, 0); |
1380 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
7dafbf52 |
1381 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 |
1382 | CvCLONED_on(cv); |
1383 | |
dd2155a4 |
1384 | #ifdef USE_ITHREADS |
1385 | CvFILE(cv) = CvXSUB(proto) ? CvFILE(proto) |
1386 | : savepv(CvFILE(proto)); |
1387 | #else |
1388 | CvFILE(cv) = CvFILE(proto); |
1389 | #endif |
1390 | CvGV(cv) = CvGV(proto); |
1391 | CvSTASH(cv) = CvSTASH(proto); |
1392 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
1393 | CvSTART(cv) = CvSTART(proto); |
b5c19bd7 |
1394 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); |
1395 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
dd2155a4 |
1396 | |
1397 | if (SvPOK(proto)) |
1398 | sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); |
1399 | |
1400 | CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); |
1401 | |
b5c19bd7 |
1402 | av_fill(PL_comppad, fpad); |
dd2155a4 |
1403 | for (ix = fname; ix >= 0; ix--) |
1404 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
1405 | |
dd2155a4 |
1406 | PL_curpad = AvARRAY(PL_comppad); |
1407 | |
71f882da |
1408 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 |
1409 | |
dd2155a4 |
1410 | for (ix = fpad; ix > 0; ix--) { |
1411 | SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; |
71f882da |
1412 | SV *sv = Nullsv; |
1413 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
b5c19bd7 |
1414 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
71f882da |
1415 | sv = outpad[(I32)SvNVX(namesv)]; |
1416 | assert(sv); |
1417 | /* formats may have an inactive parent */ |
1418 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { |
1419 | if (ckWARN(WARN_CLOSURE)) |
1420 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
1421 | "Variable \"%s\" is not available", SvPVX(namesv)); |
1422 | sv = Nullsv; |
1423 | } |
1424 | else { |
1425 | assert(!SvPADSTALE(sv)); |
1426 | sv = SvREFCNT_inc(sv); |
1427 | } |
dd2155a4 |
1428 | } |
71f882da |
1429 | if (!sv) { |
b5c19bd7 |
1430 | char *name = SvPVX(namesv); |
1431 | if (*name == '&') |
dd2155a4 |
1432 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 |
1433 | else if (*name == '@') |
1434 | sv = (SV*)newAV(); |
1435 | else if (*name == '%') |
1436 | sv = (SV*)newHV(); |
1437 | else |
1438 | sv = NEWSV(0, 0); |
235cc2e3 |
1439 | SvPADMY_on(sv); |
dd2155a4 |
1440 | } |
1441 | } |
1442 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
71f882da |
1443 | sv = SvREFCNT_inc(ppad[ix]); |
dd2155a4 |
1444 | } |
1445 | else { |
b5c19bd7 |
1446 | sv = NEWSV(0, 0); |
dd2155a4 |
1447 | SvPADTMP_on(sv); |
dd2155a4 |
1448 | } |
71f882da |
1449 | PL_curpad[ix] = sv; |
dd2155a4 |
1450 | } |
1451 | |
dd2155a4 |
1452 | DEBUG_Xv( |
1453 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
1454 | cv_dump(outside, "Outside"); |
1455 | cv_dump(proto, "Proto"); |
1456 | cv_dump(cv, "To"); |
1457 | ); |
1458 | |
1459 | LEAVE; |
1460 | |
1461 | if (CvCONST(cv)) { |
b5c19bd7 |
1462 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1463 | * The prototype was marked as a candiate for const-ization, |
1464 | * so try to grab the current const value, and if successful, |
1465 | * turn into a const sub: |
1466 | */ |
dd2155a4 |
1467 | SV* const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 |
1468 | if (const_sv) { |
1469 | SvREFCNT_dec(cv); |
1470 | cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); |
1471 | } |
1472 | else { |
1473 | CvCONST_off(cv); |
1474 | } |
dd2155a4 |
1475 | } |
1476 | |
1477 | return cv; |
1478 | } |
1479 | |
1480 | |
1481 | /* |
1482 | =for apidoc pad_fixup_inner_anons |
1483 | |
1484 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
7dafbf52 |
1485 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1486 | moved to a pre-existing CV struct. |
dd2155a4 |
1487 | |
1488 | =cut |
1489 | */ |
1490 | |
1491 | void |
1492 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
1493 | { |
1494 | I32 ix; |
1495 | AV *comppad_name = (AV*)AvARRAY(padlist)[0]; |
1496 | AV *comppad = (AV*)AvARRAY(padlist)[1]; |
1497 | SV **namepad = AvARRAY(comppad_name); |
1498 | SV **curpad = AvARRAY(comppad); |
1499 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
1500 | SV *namesv = namepad[ix]; |
1501 | if (namesv && namesv != &PL_sv_undef |
1502 | && *SvPVX(namesv) == '&') |
1503 | { |
1504 | CV *innercv = (CV*)curpad[ix]; |
7dafbf52 |
1505 | assert(CvWEAKOUTSIDE(innercv)); |
1506 | assert(CvOUTSIDE(innercv) == old_cv); |
1507 | CvOUTSIDE(innercv) = new_cv; |
dd2155a4 |
1508 | } |
1509 | } |
1510 | } |
1511 | |
7dafbf52 |
1512 | |
dd2155a4 |
1513 | /* |
1514 | =for apidoc pad_push |
1515 | |
1516 | Push a new pad frame onto the padlist, unless there's already a pad at |
1517 | this depth, in which case don't bother creating a new one. |
1518 | If has_args is true, give the new pad an @_ in slot zero. |
1519 | |
1520 | =cut |
1521 | */ |
1522 | |
1523 | void |
1524 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) |
1525 | { |
1526 | if (depth <= AvFILLp(padlist)) |
1527 | return; |
1528 | |
1529 | { |
1530 | SV** svp = AvARRAY(padlist); |
1531 | AV *newpad = newAV(); |
1532 | SV **oldpad = AvARRAY(svp[depth-1]); |
1533 | I32 ix = AvFILLp((AV*)svp[1]); |
1534 | I32 names_fill = AvFILLp((AV*)svp[0]); |
1535 | SV** names = AvARRAY(svp[0]); |
1536 | SV* sv; |
1537 | for ( ;ix > 0; ix--) { |
1538 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
1539 | char *name = SvPVX(names[ix]); |
1540 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { |
1541 | /* outer lexical or anon code */ |
1542 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
1543 | } |
1544 | else { /* our own lexical */ |
1545 | if (*name == '@') |
1546 | av_store(newpad, ix, sv = (SV*)newAV()); |
1547 | else if (*name == '%') |
1548 | av_store(newpad, ix, sv = (SV*)newHV()); |
1549 | else |
1550 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1551 | SvPADMY_on(sv); |
1552 | } |
1553 | } |
1554 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
1555 | av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); |
1556 | } |
1557 | else { |
1558 | /* save temporaries on recursion? */ |
1559 | av_store(newpad, ix, sv = NEWSV(0, 0)); |
1560 | SvPADTMP_on(sv); |
1561 | } |
1562 | } |
1563 | if (has_args) { |
1564 | AV* av = newAV(); |
1565 | av_extend(av, 0); |
1566 | av_store(newpad, 0, (SV*)av); |
1567 | AvFLAGS(av) = AVf_REIFY; |
1568 | } |
1569 | av_store(padlist, depth, (SV*)newpad); |
1570 | AvFILLp(padlist) = depth; |
1571 | } |
1572 | } |