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