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dd2155a4 DM |
1 | /* pad.c |
2 | * | |
54ca4ee7 | 3 | * Copyright (C) 2002, 2003, 2004, 2005, 2006, by Larry Wall and others |
dd2155a4 DM |
4 | * |
5 | * You may distribute under the terms of either the GNU General Public | |
6 | * License or the Artistic License, as specified in the README file. | |
7 | * | |
8 | * "Anyway: there was this Mr Frodo left an orphan and stranded, as you | |
9 | * might say, among those queer Bucklanders, being brought up anyhow in | |
10 | * Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc | |
11 | * never had fewer than a couple of hundred relations in the place. Mr | |
12 | * Bilbo never did a kinder deed than when he brought the lad back to | |
13 | * live among decent folk." --the Gaffer | |
14 | */ | |
15 | ||
16 | /* XXX DAPM | |
17 | * As of Sept 2002, this file is new and may be in a state of flux for | |
18 | * a while. I've marked things I intent to come back and look at further | |
19 | * with an 'XXX DAPM' comment. | |
20 | */ | |
21 | ||
22 | /* | |
23 | =head1 Pad Data Structures | |
24 | ||
61296642 | 25 | This file contains the functions that create and manipulate scratchpads, |
166f8a29 | 26 | which are array-of-array data structures attached to a CV (ie a sub) |
61296642 | 27 | and which store lexical variables and opcode temporary and per-thread |
166f8a29 DM |
28 | values. |
29 | ||
dd2155a4 DM |
30 | =for apidoc m|AV *|CvPADLIST|CV *cv |
31 | CV's can have CvPADLIST(cv) set to point to an AV. | |
32 | ||
33 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're | |
34 | not callable at will and are always thrown away after the eval"" is done | |
b5c19bd7 DM |
35 | executing). Require'd files are simply evals without any outer lexical |
36 | scope. | |
dd2155a4 DM |
37 | |
38 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, | |
39 | but that is really the callers pad (a slot of which is allocated by | |
40 | every entersub). | |
41 | ||
42 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items | |
f3548bdc | 43 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
dd2155a4 DM |
44 | The items in the AV are not SVs as for a normal AV, but other AVs: |
45 | ||
46 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather | |
47 | the "static type information" for lexicals. | |
48 | ||
49 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that | |
50 | depth of recursion into the CV. | |
51 | The 0'th slot of a frame AV is an AV which is @_. | |
52 | other entries are storage for variables and op targets. | |
53 | ||
54 | During compilation: | |
a6d05634 TM |
55 | C<PL_comppad_name> is set to the names AV. |
56 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. | |
57 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). | |
dd2155a4 | 58 | |
f3548bdc DM |
59 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
60 | frame of the currently executing sub. | |
61 | ||
62 | Iterating over the names AV iterates over all possible pad | |
dd2155a4 DM |
63 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
64 | &PL_sv_undef "names" (see pad_alloc()). | |
65 | ||
66 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. | |
67 | The rest are op targets/GVs/constants which are statically allocated | |
68 | or resolved at compile time. These don't have names by which they | |
69 | can be looked up from Perl code at run time through eval"" like | |
70 | my/our variables can be. Since they can't be looked up by "name" | |
71 | but only by their index allocated at compile time (which is usually | |
72 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. | |
73 | ||
74 | The SVs in the names AV have their PV being the name of the variable. | |
75 | NV+1..IV inclusive is a range of cop_seq numbers for which the name is | |
76 | valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the | |
63f10712 | 77 | type. For C<our> lexicals, the type is also SVt_PVMG, with the OURSTASH slot |
2892acdb NC |
78 | pointing at the stash of the associated global (so that duplicate C<our> |
79 | declarations in the same package can be detected). SvCUR is sometimes | |
80 | hijacked to store the generation number during compilation. | |
dd2155a4 | 81 | |
b5c19bd7 DM |
82 | If SvFAKE is set on the name SV, then that slot in the frame AV is |
83 | a REFCNT'ed reference to a lexical from "outside". In this case, | |
84 | the name SV does not use NVX and IVX to store a cop_seq range, since it is | |
85 | in scope throughout. Instead IVX stores some flags containing info about | |
86 | the real lexical (is it declared in an anon, and is it capable of being | |
87 | instantiated multiple times?), and for fake ANONs, NVX contains the index | |
88 | within the parent's pad where the lexical's value is stored, to make | |
89 | cloning quicker. | |
dd2155a4 | 90 | |
a6d05634 | 91 | If the 'name' is '&' the corresponding entry in frame AV |
dd2155a4 DM |
92 | is a CV representing a possible closure. |
93 | (SvFAKE and name of '&' is not a meaningful combination currently but could | |
94 | become so if C<my sub foo {}> is implemented.) | |
95 | ||
71f882da DM |
96 | Note that formats are treated as anon subs, and are cloned each time |
97 | write is called (if necessary). | |
98 | ||
e6e7068b DM |
99 | The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed, |
100 | and set on scope exit. This allows the 'Variable $x is not available' warning | |
101 | to be generated in evals, such as | |
102 | ||
103 | { my $x = 1; sub f { eval '$x'} } f(); | |
104 | ||
dd2155a4 DM |
105 | =cut |
106 | */ | |
107 | ||
108 | ||
109 | #include "EXTERN.h" | |
110 | #define PERL_IN_PAD_C | |
111 | #include "perl.h" | |
952306ac | 112 | #include "keywords.h" |
dd2155a4 | 113 | |
809abb02 NC |
114 | #define COP_SEQ_RANGE_LOW_set(sv,val) SvNV_set(sv, (NV)val) |
115 | #define COP_SEQ_RANGE_HIGH_set(sv,val) SvUV_set(sv, val) | |
116 | ||
117 | #define PARENT_PAD_INDEX_set(sv,val) SvNV_set(sv, (NV)val) | |
118 | #define PARENT_FAKELEX_FLAGS_set(sv,val) SvUV_set(sv, val) | |
dd2155a4 | 119 | |
fc83298a | 120 | #define PAD_MAX IV_MAX |
dd2155a4 | 121 | |
1dba731d NC |
122 | #ifdef PERL_MAD |
123 | void pad_peg(const char* s) { | |
124 | static int pegcnt; | |
125 | pegcnt++; | |
126 | } | |
127 | #endif | |
dd2155a4 DM |
128 | |
129 | /* | |
130 | =for apidoc pad_new | |
131 | ||
132 | Create a new compiling padlist, saving and updating the various global | |
133 | vars at the same time as creating the pad itself. The following flags | |
134 | can be OR'ed together: | |
135 | ||
136 | padnew_CLONE this pad is for a cloned CV | |
137 | padnew_SAVE save old globals | |
138 | padnew_SAVESUB also save extra stuff for start of sub | |
139 | ||
140 | =cut | |
141 | */ | |
142 | ||
143 | PADLIST * | |
c7c737cb | 144 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 | 145 | { |
97aff369 | 146 | dVAR; |
e1ec3a88 | 147 | AV *padlist, *padname, *pad; |
dd2155a4 | 148 | |
f3548bdc DM |
149 | ASSERT_CURPAD_LEGAL("pad_new"); |
150 | ||
dd2155a4 DM |
151 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
152 | * vars (based on flags) rather than storing vals + addresses for | |
153 | * each individually. Also see pad_block_start. | |
154 | * XXX DAPM Try to see whether all these conditionals are required | |
155 | */ | |
156 | ||
157 | /* save existing state, ... */ | |
158 | ||
159 | if (flags & padnew_SAVE) { | |
3979c56f | 160 | SAVECOMPPAD(); |
dd2155a4 DM |
161 | SAVESPTR(PL_comppad_name); |
162 | if (! (flags & padnew_CLONE)) { | |
163 | SAVEI32(PL_padix); | |
164 | SAVEI32(PL_comppad_name_fill); | |
165 | SAVEI32(PL_min_intro_pending); | |
166 | SAVEI32(PL_max_intro_pending); | |
b5c19bd7 | 167 | SAVEI32(PL_cv_has_eval); |
dd2155a4 DM |
168 | if (flags & padnew_SAVESUB) { |
169 | SAVEI32(PL_pad_reset_pending); | |
170 | } | |
171 | } | |
172 | } | |
173 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
174 | * saved - check at some pt that this is okay */ | |
175 | ||
176 | /* ... create new pad ... */ | |
177 | ||
178 | padlist = newAV(); | |
179 | padname = newAV(); | |
180 | pad = newAV(); | |
181 | ||
182 | if (flags & padnew_CLONE) { | |
183 | /* XXX DAPM I dont know why cv_clone needs it | |
184 | * doing differently yet - perhaps this separate branch can be | |
185 | * dispensed with eventually ??? | |
186 | */ | |
187 | ||
e1ec3a88 | 188 | AV * const a0 = newAV(); /* will be @_ */ |
dd2155a4 DM |
189 | av_extend(a0, 0); |
190 | av_store(pad, 0, (SV*)a0); | |
11ca45c0 | 191 | AvREIFY_only(a0); |
dd2155a4 DM |
192 | } |
193 | else { | |
a0714e2c | 194 | av_store(pad, 0, NULL); |
dd2155a4 DM |
195 | } |
196 | ||
197 | AvREAL_off(padlist); | |
198 | av_store(padlist, 0, (SV*)padname); | |
199 | av_store(padlist, 1, (SV*)pad); | |
200 | ||
201 | /* ... then update state variables */ | |
202 | ||
203 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); | |
204 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); | |
205 | PL_curpad = AvARRAY(PL_comppad); | |
206 | ||
207 | if (! (flags & padnew_CLONE)) { | |
208 | PL_comppad_name_fill = 0; | |
209 | PL_min_intro_pending = 0; | |
210 | PL_padix = 0; | |
b5c19bd7 | 211 | PL_cv_has_eval = 0; |
dd2155a4 DM |
212 | } |
213 | ||
214 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 215 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
dd2155a4 | 216 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
b5c19bd7 | 217 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
dd2155a4 DM |
218 | PTR2UV(padname), (UV)flags |
219 | ) | |
220 | ); | |
221 | ||
222 | return (PADLIST*)padlist; | |
223 | } | |
224 | ||
225 | /* | |
226 | =for apidoc pad_undef | |
227 | ||
228 | Free the padlist associated with a CV. | |
229 | If parts of it happen to be current, we null the relevant | |
230 | PL_*pad* global vars so that we don't have any dangling references left. | |
231 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
a3985cdc | 232 | inner subs to the outer of this cv. |
dd2155a4 | 233 | |
7dafbf52 DM |
234 | (This function should really be called pad_free, but the name was already |
235 | taken) | |
236 | ||
dd2155a4 DM |
237 | =cut |
238 | */ | |
239 | ||
240 | void | |
a3985cdc | 241 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 | 242 | { |
97aff369 | 243 | dVAR; |
dd2155a4 | 244 | I32 ix; |
b64e5050 | 245 | const PADLIST * const padlist = CvPADLIST(cv); |
dd2155a4 | 246 | |
1dba731d | 247 | pad_peg("pad_undef"); |
dd2155a4 DM |
248 | if (!padlist) |
249 | return; | |
0565a181 | 250 | if (SvIS_FREED(padlist)) /* may be during global destruction */ |
dd2155a4 DM |
251 | return; |
252 | ||
253 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 DM |
254 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", |
255 | PTR2UV(cv), PTR2UV(padlist)) | |
dd2155a4 DM |
256 | ); |
257 | ||
7dafbf52 DM |
258 | /* detach any '&' anon children in the pad; if afterwards they |
259 | * are still live, fix up their CvOUTSIDEs to point to our outside, | |
260 | * bypassing us. */ | |
261 | /* XXX DAPM for efficiency, we should only do this if we know we have | |
262 | * children, or integrate this loop with general cleanup */ | |
dd2155a4 | 263 | |
7dafbf52 | 264 | if (!PL_dirty) { /* don't bother during global destruction */ |
53c1dcc0 | 265 | CV * const outercv = CvOUTSIDE(cv); |
e1ec3a88 | 266 | const U32 seq = CvOUTSIDE_SEQ(cv); |
53c1dcc0 AL |
267 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
268 | SV ** const namepad = AvARRAY(comppad_name); | |
269 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; | |
270 | SV ** const curpad = AvARRAY(comppad); | |
dd2155a4 | 271 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
504618e9 | 272 | SV * const namesv = namepad[ix]; |
dd2155a4 | 273 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 274 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 275 | { |
7fc63493 | 276 | CV * const innercv = (CV*)curpad[ix]; |
10dc53a8 DM |
277 | U32 inner_rc = SvREFCNT(innercv); |
278 | assert(inner_rc); | |
a0714e2c | 279 | namepad[ix] = NULL; |
7dafbf52 | 280 | SvREFCNT_dec(namesv); |
01773faa DM |
281 | |
282 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ | |
a0714e2c | 283 | curpad[ix] = NULL; |
01773faa | 284 | SvREFCNT_dec(innercv); |
10dc53a8 | 285 | inner_rc--; |
01773faa | 286 | } |
b37c2d43 AL |
287 | |
288 | /* in use, not just a prototype */ | |
289 | if (inner_rc && (CvOUTSIDE(innercv) == cv)) { | |
7dafbf52 | 290 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 JH |
291 | /* don't relink to grandfather if he's being freed */ |
292 | if (outercv && SvREFCNT(outercv)) { | |
293 | CvWEAKOUTSIDE_off(innercv); | |
294 | CvOUTSIDE(innercv) = outercv; | |
295 | CvOUTSIDE_SEQ(innercv) = seq; | |
f84c484e | 296 | SvREFCNT_inc_simple_void_NN(outercv); |
9d1ce744 JH |
297 | } |
298 | else { | |
601f1833 | 299 | CvOUTSIDE(innercv) = NULL; |
9d1ce744 | 300 | } |
dd2155a4 DM |
301 | } |
302 | } | |
303 | } | |
304 | } | |
7dafbf52 | 305 | |
dd2155a4 DM |
306 | ix = AvFILLp(padlist); |
307 | while (ix >= 0) { | |
b37c2d43 AL |
308 | const SV* const sv = AvARRAY(padlist)[ix--]; |
309 | if (sv) { | |
310 | if (sv == (SV*)PL_comppad_name) | |
311 | PL_comppad_name = NULL; | |
312 | else if (sv == (SV*)PL_comppad) { | |
313 | PL_comppad = NULL; | |
314 | PL_curpad = NULL; | |
315 | } | |
dd2155a4 DM |
316 | } |
317 | SvREFCNT_dec(sv); | |
318 | } | |
319 | SvREFCNT_dec((SV*)CvPADLIST(cv)); | |
4608196e | 320 | CvPADLIST(cv) = NULL; |
dd2155a4 DM |
321 | } |
322 | ||
323 | ||
324 | ||
325 | ||
326 | /* | |
327 | =for apidoc pad_add_name | |
328 | ||
b5c19bd7 DM |
329 | Create a new name and associated PADMY SV in the current pad; return the |
330 | offset. | |
dd2155a4 DM |
331 | If C<typestash> is valid, the name is for a typed lexical; set the |
332 | name's stash to that value. | |
333 | If C<ourstash> is valid, it's an our lexical, set the name's | |
035dab74 | 334 | OURSTASH to that value |
dd2155a4 | 335 | |
dd2155a4 DM |
336 | If fake, it means we're cloning an existing entry |
337 | ||
338 | =cut | |
339 | */ | |
340 | ||
dd2155a4 | 341 | PADOFFSET |
952306ac | 342 | Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake, bool state) |
dd2155a4 | 343 | { |
97aff369 | 344 | dVAR; |
504618e9 | 345 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
561b68a9 | 346 | SV* const namesv = newSV(0); |
dd2155a4 | 347 | |
f3548bdc DM |
348 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
349 | ||
dd2155a4 | 350 | |
2892acdb | 351 | sv_upgrade(namesv, (ourstash || typestash) ? SVt_PVMG : SVt_PVNV); |
dd2155a4 DM |
352 | sv_setpv(namesv, name); |
353 | ||
354 | if (typestash) { | |
63f10712 | 355 | assert(SvTYPE(namesv) == SVt_PVMG); |
00b1698f | 356 | SvPAD_TYPED_on(namesv); |
b37c2d43 | 357 | SvSTASH_set(namesv, (HV*)SvREFCNT_inc_simple_NN((SV*)typestash)); |
dd2155a4 DM |
358 | } |
359 | if (ourstash) { | |
00b1698f | 360 | SvPAD_OUR_on(namesv); |
035dab74 | 361 | OURSTASH_set(namesv, ourstash); |
f84c484e | 362 | SvREFCNT_inc_simple_void_NN(ourstash); |
dd2155a4 | 363 | } |
952306ac RGS |
364 | else if (state) { |
365 | SvPAD_STATE_on(namesv); | |
366 | } | |
dd2155a4 DM |
367 | |
368 | av_store(PL_comppad_name, offset, namesv); | |
b5c19bd7 | 369 | if (fake) { |
dd2155a4 | 370 | SvFAKE_on(namesv); |
b5c19bd7 DM |
371 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
372 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); | |
373 | } | |
dd2155a4 | 374 | else { |
ee6cee0c | 375 | /* not yet introduced */ |
809abb02 NC |
376 | COP_SEQ_RANGE_LOW_set(namesv, PAD_MAX); /* min */ |
377 | COP_SEQ_RANGE_HIGH_set(namesv, 0); /* max */ | |
ee6cee0c | 378 | |
dd2155a4 DM |
379 | if (!PL_min_intro_pending) |
380 | PL_min_intro_pending = offset; | |
381 | PL_max_intro_pending = offset; | |
b5c19bd7 | 382 | /* if it's not a simple scalar, replace with an AV or HV */ |
f3548bdc DM |
383 | /* XXX DAPM since slot has been allocated, replace |
384 | * av_store with PL_curpad[offset] ? */ | |
dd2155a4 DM |
385 | if (*name == '@') |
386 | av_store(PL_comppad, offset, (SV*)newAV()); | |
387 | else if (*name == '%') | |
388 | av_store(PL_comppad, offset, (SV*)newHV()); | |
389 | SvPADMY_on(PL_curpad[offset]); | |
b5c19bd7 DM |
390 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
391 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", | |
392 | (long)offset, name, PTR2UV(PL_curpad[offset]))); | |
dd2155a4 DM |
393 | } |
394 | ||
395 | return offset; | |
396 | } | |
397 | ||
398 | ||
399 | ||
400 | ||
401 | /* | |
402 | =for apidoc pad_alloc | |
403 | ||
404 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
405 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
cf525c36 | 406 | for a slot which has no name and no active value. |
dd2155a4 DM |
407 | |
408 | =cut | |
409 | */ | |
410 | ||
411 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
412 | * or at least rationalise ??? */ | |
6d640399 NC |
413 | /* And flag whether the incoming name is UTF8 or 8 bit? |
414 | Could do this either with the +ve/-ve hack of the HV code, or expanding | |
415 | the flag bits. Either way, this makes proper Unicode safe pad support. | |
416 | Also could change the sv structure to make the NV a union with 2 U32s, | |
417 | so that SvCUR() could stop being overloaded in pad SVs. | |
418 | NWC | |
419 | */ | |
dd2155a4 DM |
420 | |
421 | PADOFFSET | |
422 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
423 | { | |
97aff369 | 424 | dVAR; |
dd2155a4 DM |
425 | SV *sv; |
426 | I32 retval; | |
427 | ||
6136c704 | 428 | PERL_UNUSED_ARG(optype); |
f3548bdc DM |
429 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
430 | ||
dd2155a4 DM |
431 | if (AvARRAY(PL_comppad) != PL_curpad) |
432 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
433 | if (PL_pad_reset_pending) | |
434 | pad_reset(); | |
435 | if (tmptype & SVs_PADMY) { | |
235cc2e3 | 436 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 DM |
437 | retval = AvFILLp(PL_comppad); |
438 | } | |
439 | else { | |
551405c4 | 440 | SV * const * const names = AvARRAY(PL_comppad_name); |
e1ec3a88 | 441 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
dd2155a4 DM |
442 | for (;;) { |
443 | /* | |
444 | * "foreach" index vars temporarily become aliases to non-"my" | |
445 | * values. Thus we must skip, not just pad values that are | |
446 | * marked as current pad values, but also those with names. | |
447 | */ | |
448 | /* HVDS why copy to sv here? we don't seem to use it */ | |
449 | if (++PL_padix <= names_fill && | |
450 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
451 | continue; | |
452 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
453 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
454 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
455 | break; | |
456 | } | |
457 | retval = PL_padix; | |
458 | } | |
459 | SvFLAGS(sv) |= tmptype; | |
460 | PL_curpad = AvARRAY(PL_comppad); | |
461 | ||
462 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
463 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
464 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
465 | PL_op_name[optype])); | |
fd0854ff DM |
466 | #ifdef DEBUG_LEAKING_SCALARS |
467 | sv->sv_debug_optype = optype; | |
468 | sv->sv_debug_inpad = 1; | |
fd0854ff | 469 | #endif |
a212c8b5 | 470 | return (PADOFFSET)retval; |
dd2155a4 DM |
471 | } |
472 | ||
473 | /* | |
474 | =for apidoc pad_add_anon | |
475 | ||
476 | Add an anon code entry to the current compiling pad | |
477 | ||
478 | =cut | |
479 | */ | |
480 | ||
481 | PADOFFSET | |
482 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
483 | { | |
97aff369 | 484 | dVAR; |
dd2155a4 | 485 | PADOFFSET ix; |
561b68a9 | 486 | SV* const name = newSV(0); |
1dba731d | 487 | pad_peg("add_anon"); |
dd2155a4 DM |
488 | sv_upgrade(name, SVt_PVNV); |
489 | sv_setpvn(name, "&", 1); | |
809abb02 NC |
490 | /* Are these two actually ever read? */ |
491 | COP_SEQ_RANGE_HIGH_set(name, ~0); | |
492 | COP_SEQ_RANGE_LOW_set(name, 1); | |
dd2155a4 DM |
493 | ix = pad_alloc(op_type, SVs_PADMY); |
494 | av_store(PL_comppad_name, ix, name); | |
f3548bdc | 495 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 DM |
496 | av_store(PL_comppad, ix, sv); |
497 | SvPADMY_on(sv); | |
7dafbf52 DM |
498 | |
499 | /* to avoid ref loops, we never have parent + child referencing each | |
500 | * other simultaneously */ | |
501 | if (CvOUTSIDE((CV*)sv)) { | |
502 | assert(!CvWEAKOUTSIDE((CV*)sv)); | |
503 | CvWEAKOUTSIDE_on((CV*)sv); | |
504 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); | |
505 | } | |
dd2155a4 DM |
506 | return ix; |
507 | } | |
508 | ||
509 | ||
510 | ||
511 | /* | |
512 | =for apidoc pad_check_dup | |
513 | ||
514 | Check for duplicate declarations: report any of: | |
515 | * a my in the current scope with the same name; | |
516 | * an our (anywhere in the pad) with the same name and the same stash | |
517 | as C<ourstash> | |
518 | C<is_our> indicates that the name to check is an 'our' declaration | |
519 | ||
520 | =cut | |
521 | */ | |
522 | ||
523 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
524 | ||
525 | void | |
e1ec3a88 | 526 | Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash) |
dd2155a4 | 527 | { |
97aff369 | 528 | dVAR; |
53c1dcc0 | 529 | SV **svp; |
dd2155a4 DM |
530 | PADOFFSET top, off; |
531 | ||
f3548bdc | 532 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
041457d9 | 533 | if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) |
dd2155a4 DM |
534 | return; /* nothing to check */ |
535 | ||
536 | svp = AvARRAY(PL_comppad_name); | |
537 | top = AvFILLp(PL_comppad_name); | |
538 | /* check the current scope */ | |
539 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
540 | * type ? */ | |
541 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
53c1dcc0 AL |
542 | SV * const sv = svp[off]; |
543 | if (sv | |
dd2155a4 | 544 | && sv != &PL_sv_undef |
ee6cee0c | 545 | && !SvFAKE(sv) |
809abb02 | 546 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
b15aece3 | 547 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 | 548 | { |
00b1698f | 549 | if (is_our && (SvPAD_OUR(sv))) |
7f73a9f1 | 550 | break; /* "our" masking "our" */ |
dd2155a4 DM |
551 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
552 | "\"%s\" variable %s masks earlier declaration in same %s", | |
952306ac | 553 | (is_our ? "our" : PL_in_my == KEY_my ? "my" : "state"), |
dd2155a4 | 554 | name, |
809abb02 | 555 | (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX ? "scope" : "statement")); |
dd2155a4 DM |
556 | --off; |
557 | break; | |
558 | } | |
559 | } | |
560 | /* check the rest of the pad */ | |
561 | if (is_our) { | |
562 | do { | |
53c1dcc0 AL |
563 | SV * const sv = svp[off]; |
564 | if (sv | |
dd2155a4 | 565 | && sv != &PL_sv_undef |
ee6cee0c | 566 | && !SvFAKE(sv) |
809abb02 | 567 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
035dab74 | 568 | && OURSTASH(sv) == ourstash |
b15aece3 | 569 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 DM |
570 | { |
571 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
572 | "\"our\" variable %s redeclared", name); | |
624f69f5 | 573 | if ((I32)off <= PL_comppad_name_floor) |
7f73a9f1 RGS |
574 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
575 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
dd2155a4 DM |
576 | break; |
577 | } | |
578 | } while ( off-- > 0 ); | |
579 | } | |
580 | } | |
581 | ||
582 | ||
dd2155a4 DM |
583 | /* |
584 | =for apidoc pad_findmy | |
585 | ||
586 | Given a lexical name, try to find its offset, first in the current pad, | |
587 | or failing that, in the pads of any lexically enclosing subs (including | |
588 | the complications introduced by eval). If the name is found in an outer pad, | |
589 | then a fake entry is added to the current pad. | |
590 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
591 | ||
592 | =cut | |
593 | */ | |
594 | ||
595 | PADOFFSET | |
e1ec3a88 | 596 | Perl_pad_findmy(pTHX_ const char *name) |
dd2155a4 | 597 | { |
97aff369 | 598 | dVAR; |
b5c19bd7 DM |
599 | SV *out_sv; |
600 | int out_flags; | |
929a0744 | 601 | I32 offset; |
e1ec3a88 | 602 | const AV *nameav; |
929a0744 | 603 | SV **name_svp; |
dd2155a4 | 604 | |
1dba731d | 605 | pad_peg("pad_findmy"); |
9f7d9405 | 606 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
4608196e | 607 | NULL, &out_sv, &out_flags); |
9f7d9405 | 608 | if ((PADOFFSET)offset != NOT_IN_PAD) |
929a0744 DM |
609 | return offset; |
610 | ||
611 | /* look for an our that's being introduced; this allows | |
612 | * our $foo = 0 unless defined $foo; | |
613 | * to not give a warning. (Yes, this is a hack) */ | |
614 | ||
615 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; | |
616 | name_svp = AvARRAY(nameav); | |
617 | for (offset = AvFILLp(nameav); offset > 0; offset--) { | |
551405c4 | 618 | const SV * const namesv = name_svp[offset]; |
929a0744 DM |
619 | if (namesv && namesv != &PL_sv_undef |
620 | && !SvFAKE(namesv) | |
00b1698f | 621 | && (SvPAD_OUR(namesv)) |
b15aece3 | 622 | && strEQ(SvPVX_const(namesv), name) |
809abb02 | 623 | && COP_SEQ_RANGE_LOW(namesv) == PAD_MAX /* min */ |
929a0744 DM |
624 | ) |
625 | return offset; | |
626 | } | |
627 | return NOT_IN_PAD; | |
dd2155a4 DM |
628 | } |
629 | ||
e1f795dc RGS |
630 | /* |
631 | * Returns the offset of a lexical $_, if there is one, at run time. | |
632 | * Used by the UNDERBAR XS macro. | |
633 | */ | |
634 | ||
635 | PADOFFSET | |
29289021 | 636 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc | 637 | { |
97aff369 | 638 | dVAR; |
e1f795dc RGS |
639 | SV *out_sv; |
640 | int out_flags; | |
641 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, | |
4608196e | 642 | NULL, &out_sv, &out_flags); |
e1f795dc | 643 | } |
dd2155a4 | 644 | |
dd2155a4 DM |
645 | /* |
646 | =for apidoc pad_findlex | |
647 | ||
648 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
b5c19bd7 DM |
649 | in the inner pads if it's found in an outer one. |
650 | ||
651 | Returns the offset in the bottom pad of the lex or the fake lex. | |
652 | cv is the CV in which to start the search, and seq is the current cop_seq | |
653 | to match against. If warn is true, print appropriate warnings. The out_* | |
654 | vars return values, and so are pointers to where the returned values | |
655 | should be stored. out_capture, if non-null, requests that the innermost | |
656 | instance of the lexical is captured; out_name_sv is set to the innermost | |
657 | matched namesv or fake namesv; out_flags returns the flags normally | |
658 | associated with the IVX field of a fake namesv. | |
659 | ||
660 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, | |
661 | then comes back down, adding fake entries as it goes. It has to be this way | |
662 | because fake namesvs in anon protoypes have to store in NVX the index into | |
663 | the parent pad. | |
dd2155a4 DM |
664 | |
665 | =cut | |
666 | */ | |
667 | ||
b5c19bd7 DM |
668 | /* Flags set in the SvIVX field of FAKE namesvs */ |
669 | ||
670 | #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ | |
671 | #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ | |
672 | ||
673 | /* the CV has finished being compiled. This is not a sufficient test for | |
674 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
675 | #define CvCOMPILED(cv) CvROOT(cv) | |
676 | ||
71f882da DM |
677 | /* the CV does late binding of its lexicals */ |
678 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) | |
679 | ||
b5c19bd7 | 680 | |
dd2155a4 | 681 | STATIC PADOFFSET |
e1ec3a88 | 682 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
b5c19bd7 | 683 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 | 684 | { |
97aff369 | 685 | dVAR; |
b5c19bd7 DM |
686 | I32 offset, new_offset; |
687 | SV *new_capture; | |
688 | SV **new_capturep; | |
b64e5050 | 689 | const AV * const padlist = CvPADLIST(cv); |
dd2155a4 | 690 | |
b5c19bd7 | 691 | *out_flags = 0; |
a3985cdc | 692 | |
b5c19bd7 DM |
693 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
694 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", | |
695 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); | |
dd2155a4 | 696 | |
b5c19bd7 | 697 | /* first, search this pad */ |
dd2155a4 | 698 | |
b5c19bd7 DM |
699 | if (padlist) { /* not an undef CV */ |
700 | I32 fake_offset = 0; | |
551405c4 AL |
701 | const AV * const nameav = (AV*)AvARRAY(padlist)[0]; |
702 | SV * const * const name_svp = AvARRAY(nameav); | |
ee6cee0c | 703 | |
b5c19bd7 | 704 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
551405c4 | 705 | const SV * const namesv = name_svp[offset]; |
b5c19bd7 | 706 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 707 | && strEQ(SvPVX_const(namesv), name)) |
b5c19bd7 DM |
708 | { |
709 | if (SvFAKE(namesv)) | |
710 | fake_offset = offset; /* in case we don't find a real one */ | |
809abb02 NC |
711 | else if ( seq > COP_SEQ_RANGE_LOW(namesv) /* min */ |
712 | && seq <= COP_SEQ_RANGE_HIGH(namesv)) /* max */ | |
b5c19bd7 | 713 | break; |
ee6cee0c DM |
714 | } |
715 | } | |
716 | ||
b5c19bd7 DM |
717 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
718 | if (offset > 0) { /* not fake */ | |
719 | fake_offset = 0; | |
720 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
721 | ||
722 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
723 | * instances. For now, we just test !CvUNIQUE(cv), but | |
724 | * ideally, we should detect my's declared within loops | |
725 | * etc - this would allow a wider range of 'not stayed | |
726 | * shared' warnings. We also treated alreadly-compiled | |
727 | * lexes as not multi as viewed from evals. */ | |
728 | ||
729 | *out_flags = CvANON(cv) ? | |
730 | PAD_FAKELEX_ANON : | |
731 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
732 | ? PAD_FAKELEX_MULTI : 0; | |
733 | ||
734 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
809abb02 NC |
735 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%lu,%lu)\n", |
736 | PTR2UV(cv), (long)offset, | |
737 | (unsigned long)COP_SEQ_RANGE_LOW(*out_name_sv), | |
738 | (unsigned long)COP_SEQ_RANGE_HIGH(*out_name_sv))); | |
b5c19bd7 DM |
739 | } |
740 | else { /* fake match */ | |
741 | offset = fake_offset; | |
742 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
809abb02 | 743 | *out_flags = PARENT_FAKELEX_FLAGS(*out_name_sv); |
b5c19bd7 | 744 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
19a5c512 | 745 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 | 746 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
809abb02 | 747 | (unsigned long) PARENT_PAD_INDEX(*out_name_sv) |
b5c19bd7 DM |
748 | )); |
749 | } | |
dd2155a4 | 750 | |
b5c19bd7 | 751 | /* return the lex? */ |
dd2155a4 | 752 | |
b5c19bd7 | 753 | if (out_capture) { |
dd2155a4 | 754 | |
b5c19bd7 | 755 | /* our ? */ |
00b1698f | 756 | if (SvPAD_OUR(*out_name_sv)) { |
a0714e2c | 757 | *out_capture = NULL; |
b5c19bd7 DM |
758 | return offset; |
759 | } | |
ee6cee0c | 760 | |
b5c19bd7 DM |
761 | /* trying to capture from an anon prototype? */ |
762 | if (CvCOMPILED(cv) | |
763 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
764 | : *out_flags & PAD_FAKELEX_ANON) | |
765 | { | |
766 | if (warn && ckWARN(WARN_CLOSURE)) | |
767 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
768 | "Variable \"%s\" is not available", name); | |
a0714e2c | 769 | *out_capture = NULL; |
b5c19bd7 | 770 | } |
ee6cee0c | 771 | |
b5c19bd7 DM |
772 | /* real value */ |
773 | else { | |
774 | int newwarn = warn; | |
775 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
776 | && warn && ckWARN(WARN_CLOSURE)) { | |
777 | newwarn = 0; | |
778 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
779 | "Variable \"%s\" will not stay shared", name); | |
780 | } | |
dd2155a4 | 781 | |
b5c19bd7 DM |
782 | if (fake_offset && CvANON(cv) |
783 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
784 | { | |
785 | SV *n; | |
786 | /* not yet caught - look further up */ | |
787 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
788 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", | |
789 | PTR2UV(cv))); | |
790 | n = *out_name_sv; | |
282e1742 DM |
791 | (void) pad_findlex(name, CvOUTSIDE(cv), |
792 | CvOUTSIDE_SEQ(cv), | |
b5c19bd7 DM |
793 | newwarn, out_capture, out_name_sv, out_flags); |
794 | *out_name_sv = n; | |
795 | return offset; | |
dd2155a4 | 796 | } |
b5c19bd7 DM |
797 | |
798 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ | |
799 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; | |
800 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
801 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", | |
19a5c512 | 802 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 DM |
803 | |
804 | if (SvPADSTALE(*out_capture)) { | |
805 | if (ckWARN(WARN_CLOSURE)) | |
ee6cee0c | 806 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 | 807 | "Variable \"%s\" is not available", name); |
a0714e2c | 808 | *out_capture = NULL; |
dd2155a4 DM |
809 | } |
810 | } | |
b5c19bd7 DM |
811 | if (!*out_capture) { |
812 | if (*name == '@') | |
813 | *out_capture = sv_2mortal((SV*)newAV()); | |
814 | else if (*name == '%') | |
815 | *out_capture = sv_2mortal((SV*)newHV()); | |
816 | else | |
817 | *out_capture = sv_newmortal(); | |
818 | } | |
dd2155a4 | 819 | } |
b5c19bd7 DM |
820 | |
821 | return offset; | |
ee6cee0c | 822 | } |
b5c19bd7 DM |
823 | } |
824 | ||
825 | /* it's not in this pad - try above */ | |
826 | ||
827 | if (!CvOUTSIDE(cv)) | |
828 | return NOT_IN_PAD; | |
9f7d9405 | 829 | |
b5c19bd7 | 830 | /* out_capture non-null means caller wants us to capture lex; in |
71f882da | 831 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 832 | new_capturep = out_capture ? out_capture : |
4608196e | 833 | CvLATE(cv) ? NULL : &new_capture; |
b5c19bd7 DM |
834 | |
835 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
836 | new_capturep, out_name_sv, out_flags); | |
9f7d9405 | 837 | if ((PADOFFSET)offset == NOT_IN_PAD) |
b5c19bd7 | 838 | return NOT_IN_PAD; |
9f7d9405 | 839 | |
b5c19bd7 DM |
840 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
841 | ||
842 | /* don't add new fake entries (via eval) to CVs that we have already | |
843 | * finished compiling, or to undef CVs */ | |
844 | if (CvCOMPILED(cv) || !padlist) | |
845 | return 0; /* this dummy (and invalid) value isnt used by the caller */ | |
846 | ||
847 | { | |
848 | SV *new_namesv; | |
53c1dcc0 AL |
849 | AV * const ocomppad_name = PL_comppad_name; |
850 | PAD * const ocomppad = PL_comppad; | |
b5c19bd7 DM |
851 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
852 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
853 | PL_curpad = AvARRAY(PL_comppad); | |
854 | ||
855 | new_offset = pad_add_name( | |
b15aece3 | 856 | SvPVX_const(*out_name_sv), |
00b1698f | 857 | SvPAD_TYPED(*out_name_sv) |
5c284bb0 | 858 | ? SvSTASH(*out_name_sv) : NULL, |
035dab74 | 859 | OURSTASH(*out_name_sv), |
952306ac RGS |
860 | 1, /* fake */ |
861 | 0 /* not a state variable */ | |
b5c19bd7 DM |
862 | ); |
863 | ||
864 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; | |
809abb02 | 865 | PARENT_FAKELEX_FLAGS_set(new_namesv, *out_flags); |
b5c19bd7 | 866 | |
809abb02 | 867 | PARENT_PAD_INDEX_set(new_namesv, 0); |
00b1698f | 868 | if (SvPAD_OUR(new_namesv)) { |
6f207bd3 | 869 | NOOP; /* do nothing */ |
b5c19bd7 | 870 | } |
71f882da | 871 | else if (CvLATE(cv)) { |
b5c19bd7 | 872 | /* delayed creation - just note the offset within parent pad */ |
809abb02 | 873 | PARENT_PAD_INDEX_set(new_namesv, offset); |
b5c19bd7 DM |
874 | CvCLONE_on(cv); |
875 | } | |
876 | else { | |
877 | /* immediate creation - capture outer value right now */ | |
878 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
879 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
880 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", | |
881 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
dd2155a4 | 882 | } |
b5c19bd7 | 883 | *out_name_sv = new_namesv; |
809abb02 | 884 | *out_flags = PARENT_FAKELEX_FLAGS(new_namesv); |
b5c19bd7 DM |
885 | |
886 | PL_comppad_name = ocomppad_name; | |
887 | PL_comppad = ocomppad; | |
4608196e | 888 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL; |
dd2155a4 | 889 | } |
b5c19bd7 | 890 | return new_offset; |
dd2155a4 DM |
891 | } |
892 | ||
fb8a9836 AL |
893 | |
894 | #ifdef DEBUGGING | |
dd2155a4 DM |
895 | /* |
896 | =for apidoc pad_sv | |
897 | ||
898 | Get the value at offset po in the current pad. | |
899 | Use macro PAD_SV instead of calling this function directly. | |
900 | ||
901 | =cut | |
902 | */ | |
903 | ||
904 | ||
905 | SV * | |
906 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
907 | { | |
97aff369 | 908 | dVAR; |
f3548bdc | 909 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 910 | |
dd2155a4 DM |
911 | if (!po) |
912 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
913 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
914 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 915 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
916 | ); |
917 | return PL_curpad[po]; | |
918 | } | |
919 | ||
920 | ||
921 | /* | |
922 | =for apidoc pad_setsv | |
923 | ||
924 | Set the entry at offset po in the current pad to sv. | |
925 | Use the macro PAD_SETSV() rather than calling this function directly. | |
926 | ||
927 | =cut | |
928 | */ | |
929 | ||
dd2155a4 DM |
930 | void |
931 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
932 | { | |
97aff369 | 933 | dVAR; |
f3548bdc | 934 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
935 | |
936 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
937 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 938 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
939 | ); |
940 | PL_curpad[po] = sv; | |
941 | } | |
942 | #endif | |
943 | ||
944 | ||
945 | ||
946 | /* | |
947 | =for apidoc pad_block_start | |
948 | ||
949 | Update the pad compilation state variables on entry to a new block | |
950 | ||
951 | =cut | |
952 | */ | |
953 | ||
954 | /* XXX DAPM perhaps: | |
955 | * - integrate this in general state-saving routine ??? | |
956 | * - combine with the state-saving going on in pad_new ??? | |
957 | * - introduce a new SAVE type that does all this in one go ? | |
958 | */ | |
959 | ||
960 | void | |
961 | Perl_pad_block_start(pTHX_ int full) | |
962 | { | |
97aff369 | 963 | dVAR; |
f3548bdc | 964 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
965 | SAVEI32(PL_comppad_name_floor); |
966 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
967 | if (full) | |
968 | PL_comppad_name_fill = PL_comppad_name_floor; | |
969 | if (PL_comppad_name_floor < 0) | |
970 | PL_comppad_name_floor = 0; | |
971 | SAVEI32(PL_min_intro_pending); | |
972 | SAVEI32(PL_max_intro_pending); | |
973 | PL_min_intro_pending = 0; | |
974 | SAVEI32(PL_comppad_name_fill); | |
975 | SAVEI32(PL_padix_floor); | |
976 | PL_padix_floor = PL_padix; | |
977 | PL_pad_reset_pending = FALSE; | |
978 | } | |
979 | ||
980 | ||
981 | /* | |
982 | =for apidoc intro_my | |
983 | ||
984 | "Introduce" my variables to visible status. | |
985 | ||
986 | =cut | |
987 | */ | |
988 | ||
989 | U32 | |
990 | Perl_intro_my(pTHX) | |
991 | { | |
97aff369 | 992 | dVAR; |
dd2155a4 | 993 | SV **svp; |
dd2155a4 DM |
994 | I32 i; |
995 | ||
f3548bdc | 996 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
997 | if (! PL_min_intro_pending) |
998 | return PL_cop_seqmax; | |
999 | ||
1000 | svp = AvARRAY(PL_comppad_name); | |
1001 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
53c1dcc0 AL |
1002 | SV * const sv = svp[i]; |
1003 | ||
809abb02 NC |
1004 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !COP_SEQ_RANGE_HIGH(sv)) { |
1005 | COP_SEQ_RANGE_HIGH_set(sv, PAD_MAX); /* Don't know scope end yet. */ | |
1006 | COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax); | |
dd2155a4 | 1007 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
809abb02 | 1008 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
b15aece3 | 1009 | (long)i, SvPVX_const(sv), |
809abb02 NC |
1010 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
1011 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
dd2155a4 DM |
1012 | ); |
1013 | } | |
1014 | } | |
1015 | PL_min_intro_pending = 0; | |
1016 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
1017 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1018 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
1019 | ||
1020 | return PL_cop_seqmax++; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | =for apidoc pad_leavemy | |
1025 | ||
1026 | Cleanup at end of scope during compilation: set the max seq number for | |
1027 | lexicals in this scope and warn of any lexicals that never got introduced. | |
1028 | ||
1029 | =cut | |
1030 | */ | |
1031 | ||
1032 | void | |
1033 | Perl_pad_leavemy(pTHX) | |
1034 | { | |
97aff369 | 1035 | dVAR; |
dd2155a4 | 1036 | I32 off; |
551405c4 | 1037 | SV * const * const svp = AvARRAY(PL_comppad_name); |
dd2155a4 DM |
1038 | |
1039 | PL_pad_reset_pending = FALSE; | |
1040 | ||
f3548bdc | 1041 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
1042 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
1043 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
53c1dcc0 AL |
1044 | const SV * const sv = svp[off]; |
1045 | if (sv && sv != &PL_sv_undef | |
ee6cee0c | 1046 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
dd2155a4 | 1047 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
95b63a38 JH |
1048 | "%"SVf" never introduced", |
1049 | (void*)sv); | |
dd2155a4 DM |
1050 | } |
1051 | } | |
1052 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
1053 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
53c1dcc0 | 1054 | const SV * const sv = svp[off]; |
809abb02 NC |
1055 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && COP_SEQ_RANGE_HIGH(sv) == PAD_MAX) { |
1056 | COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax); | |
dd2155a4 | 1057 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
809abb02 | 1058 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
b15aece3 | 1059 | (long)off, SvPVX_const(sv), |
809abb02 NC |
1060 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
1061 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
dd2155a4 DM |
1062 | ); |
1063 | } | |
1064 | } | |
1065 | PL_cop_seqmax++; | |
1066 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1067 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1068 | } | |
1069 | ||
1070 | ||
1071 | /* | |
1072 | =for apidoc pad_swipe | |
1073 | ||
1074 | Abandon the tmp in the current pad at offset po and replace with a | |
1075 | new one. | |
1076 | ||
1077 | =cut | |
1078 | */ | |
1079 | ||
1080 | void | |
1081 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1082 | { | |
97aff369 | 1083 | dVAR; |
f3548bdc | 1084 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
1085 | if (!PL_curpad) |
1086 | return; | |
1087 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1088 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1089 | if (!po) | |
1090 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1091 | ||
1092 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1093 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1094 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1095 | ||
1096 | if (PL_curpad[po]) | |
1097 | SvPADTMP_off(PL_curpad[po]); | |
1098 | if (refadjust) | |
1099 | SvREFCNT_dec(PL_curpad[po]); | |
1100 | ||
9ad9869c DM |
1101 | |
1102 | /* if pad tmps aren't shared between ops, then there's no need to | |
1103 | * create a new tmp when an existing op is freed */ | |
1104 | #ifdef USE_BROKEN_PAD_RESET | |
561b68a9 | 1105 | PL_curpad[po] = newSV(0); |
dd2155a4 | 1106 | SvPADTMP_on(PL_curpad[po]); |
9ad9869c DM |
1107 | #else |
1108 | PL_curpad[po] = &PL_sv_undef; | |
97bf4a8d | 1109 | #endif |
dd2155a4 DM |
1110 | if ((I32)po < PL_padix) |
1111 | PL_padix = po - 1; | |
1112 | } | |
1113 | ||
1114 | ||
1115 | /* | |
1116 | =for apidoc pad_reset | |
1117 | ||
1118 | Mark all the current temporaries for reuse | |
1119 | ||
1120 | =cut | |
1121 | */ | |
1122 | ||
1123 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1124 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1125 | * on the stack by OPs that use them, there are several ways to get an alias | |
1126 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1127 | * We avoid doing this until we can think of a Better Way. | |
1128 | * GSAR 97-10-29 */ | |
1129 | void | |
1130 | Perl_pad_reset(pTHX) | |
1131 | { | |
97aff369 | 1132 | dVAR; |
dd2155a4 | 1133 | #ifdef USE_BROKEN_PAD_RESET |
dd2155a4 DM |
1134 | if (AvARRAY(PL_comppad) != PL_curpad) |
1135 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1136 | ||
1137 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1138 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1139 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1140 | (long)PL_padix, (long)PL_padix_floor | |
1141 | ) | |
1142 | ); | |
1143 | ||
1144 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
e1ec3a88 | 1145 | register I32 po; |
dd2155a4 DM |
1146 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1147 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1148 | SvPADTMP_off(PL_curpad[po]); | |
1149 | } | |
1150 | PL_padix = PL_padix_floor; | |
1151 | } | |
1152 | #endif | |
1153 | PL_pad_reset_pending = FALSE; | |
1154 | } | |
1155 | ||
1156 | ||
1157 | /* | |
1158 | =for apidoc pad_tidy | |
1159 | ||
1160 | Tidy up a pad after we've finished compiling it: | |
1161 | * remove most stuff from the pads of anonsub prototypes; | |
1162 | * give it a @_; | |
1163 | * mark tmps as such. | |
1164 | ||
1165 | =cut | |
1166 | */ | |
1167 | ||
1168 | /* XXX DAPM surely most of this stuff should be done properly | |
1169 | * at the right time beforehand, rather than going around afterwards | |
1170 | * cleaning up our mistakes ??? | |
1171 | */ | |
1172 | ||
1173 | void | |
1174 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1175 | { | |
27da23d5 | 1176 | dVAR; |
dd2155a4 | 1177 | |
f3548bdc | 1178 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 DM |
1179 | |
1180 | /* If this CV has had any 'eval-capable' ops planted in it | |
1181 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any | |
1182 | * anon prototypes in the chain of CVs should be marked as cloneable, | |
1183 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets | |
1184 | * the right CvOUTSIDE. | |
1185 | * If running with -d, *any* sub may potentially have an eval | |
1186 | * excuted within it. | |
1187 | */ | |
1188 | ||
1189 | if (PL_cv_has_eval || PL_perldb) { | |
e1ec3a88 | 1190 | const CV *cv; |
b5c19bd7 DM |
1191 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1192 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1193 | break; /* no need to mark already-compiled code */ | |
1194 | if (CvANON(cv)) { | |
1195 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1196 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); | |
1197 | CvCLONE_on(cv); | |
1198 | } | |
1199 | } | |
1200 | } | |
1201 | ||
dd2155a4 DM |
1202 | /* extend curpad to match namepad */ |
1203 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
a0714e2c | 1204 | av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
dd2155a4 DM |
1205 | |
1206 | if (type == padtidy_SUBCLONE) { | |
551405c4 | 1207 | SV * const * const namep = AvARRAY(PL_comppad_name); |
504618e9 | 1208 | PADOFFSET ix; |
b5c19bd7 | 1209 | |
dd2155a4 DM |
1210 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1211 | SV *namesv; | |
1212 | ||
1213 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1214 | continue; | |
1215 | /* | |
1216 | * The only things that a clonable function needs in its | |
b5c19bd7 | 1217 | * pad are anonymous subs. |
dd2155a4 DM |
1218 | * The rest are created anew during cloning. |
1219 | */ | |
a0714e2c | 1220 | if (!((namesv = namep[ix]) != NULL && |
dd2155a4 | 1221 | namesv != &PL_sv_undef && |
b15aece3 | 1222 | *SvPVX_const(namesv) == '&')) |
dd2155a4 DM |
1223 | { |
1224 | SvREFCNT_dec(PL_curpad[ix]); | |
a0714e2c | 1225 | PL_curpad[ix] = NULL; |
dd2155a4 DM |
1226 | } |
1227 | } | |
1228 | } | |
1229 | else if (type == padtidy_SUB) { | |
1230 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
53c1dcc0 | 1231 | AV * const av = newAV(); /* Will be @_ */ |
dd2155a4 DM |
1232 | av_extend(av, 0); |
1233 | av_store(PL_comppad, 0, (SV*)av); | |
11ca45c0 | 1234 | AvREIFY_only(av); |
dd2155a4 DM |
1235 | } |
1236 | ||
1237 | /* XXX DAPM rationalise these two similar branches */ | |
1238 | ||
1239 | if (type == padtidy_SUB) { | |
504618e9 | 1240 | PADOFFSET ix; |
dd2155a4 DM |
1241 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1242 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1243 | continue; | |
1244 | if (!SvPADMY(PL_curpad[ix])) | |
1245 | SvPADTMP_on(PL_curpad[ix]); | |
1246 | } | |
1247 | } | |
1248 | else if (type == padtidy_FORMAT) { | |
504618e9 | 1249 | PADOFFSET ix; |
dd2155a4 DM |
1250 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1251 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1252 | SvPADTMP_on(PL_curpad[ix]); | |
1253 | } | |
1254 | } | |
f3548bdc | 1255 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1256 | } |
1257 | ||
1258 | ||
1259 | /* | |
1260 | =for apidoc pad_free | |
1261 | ||
8627550a | 1262 | Free the SV at offset po in the current pad. |
dd2155a4 DM |
1263 | |
1264 | =cut | |
1265 | */ | |
1266 | ||
1267 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1268 | void | |
1269 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1270 | { | |
97aff369 | 1271 | dVAR; |
f3548bdc | 1272 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1273 | if (!PL_curpad) |
1274 | return; | |
1275 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1276 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1277 | if (!po) | |
1278 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1279 | ||
1280 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1281 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1282 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1283 | ); | |
1284 | ||
1285 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1286 | SvPADTMP_off(PL_curpad[po]); | |
1287 | #ifdef USE_ITHREADS | |
7e736055 HS |
1288 | /* SV could be a shared hash key (eg bugid #19022) */ |
1289 | if ( | |
f8c7b90f | 1290 | #ifdef PERL_OLD_COPY_ON_WRITE |
7e736055 HS |
1291 | !SvIsCOW(PL_curpad[po]) |
1292 | #else | |
1293 | !SvFAKE(PL_curpad[po]) | |
dd2155a4 | 1294 | #endif |
7e736055 | 1295 | ) |
dd2155a4 | 1296 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1297 | #endif |
1298 | } | |
1299 | if ((I32)po < PL_padix) | |
1300 | PL_padix = po - 1; | |
1301 | } | |
1302 | ||
1303 | ||
1304 | ||
1305 | /* | |
1306 | =for apidoc do_dump_pad | |
1307 | ||
1308 | Dump the contents of a padlist | |
1309 | ||
1310 | =cut | |
1311 | */ | |
1312 | ||
1313 | void | |
1314 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1315 | { | |
97aff369 | 1316 | dVAR; |
e1ec3a88 AL |
1317 | const AV *pad_name; |
1318 | const AV *pad; | |
dd2155a4 DM |
1319 | SV **pname; |
1320 | SV **ppad; | |
dd2155a4 DM |
1321 | I32 ix; |
1322 | ||
1323 | if (!padlist) { | |
1324 | return; | |
1325 | } | |
1326 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1327 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1328 | pname = AvARRAY(pad_name); | |
1329 | ppad = AvARRAY(pad); | |
1330 | Perl_dump_indent(aTHX_ level, file, | |
1331 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1332 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1333 | ); | |
1334 | ||
1335 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
e1ec3a88 | 1336 | const SV *namesv = pname[ix]; |
dd2155a4 | 1337 | if (namesv && namesv == &PL_sv_undef) { |
a0714e2c | 1338 | namesv = NULL; |
dd2155a4 DM |
1339 | } |
1340 | if (namesv) { | |
ee6cee0c DM |
1341 | if (SvFAKE(namesv)) |
1342 | Perl_dump_indent(aTHX_ level+1, file, | |
c0fd1b42 | 1343 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c DM |
1344 | (int) ix, |
1345 | PTR2UV(ppad[ix]), | |
1346 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
b15aece3 | 1347 | SvPVX_const(namesv), |
809abb02 NC |
1348 | (unsigned long)PARENT_FAKELEX_FLAGS(namesv), |
1349 | (unsigned long)PARENT_PAD_INDEX(namesv) | |
b5c19bd7 | 1350 | |
ee6cee0c DM |
1351 | ); |
1352 | else | |
1353 | Perl_dump_indent(aTHX_ level+1, file, | |
809abb02 | 1354 | "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n", |
ee6cee0c DM |
1355 | (int) ix, |
1356 | PTR2UV(ppad[ix]), | |
1357 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
809abb02 NC |
1358 | (unsigned long)COP_SEQ_RANGE_LOW(namesv), |
1359 | (unsigned long)COP_SEQ_RANGE_HIGH(namesv), | |
b15aece3 | 1360 | SvPVX_const(namesv) |
ee6cee0c | 1361 | ); |
dd2155a4 DM |
1362 | } |
1363 | else if (full) { | |
1364 | Perl_dump_indent(aTHX_ level+1, file, | |
1365 | "%2d. 0x%"UVxf"<%lu>\n", | |
1366 | (int) ix, | |
1367 | PTR2UV(ppad[ix]), | |
1368 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1369 | ); | |
1370 | } | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | ||
1375 | ||
1376 | /* | |
1377 | =for apidoc cv_dump | |
1378 | ||
1379 | dump the contents of a CV | |
1380 | ||
1381 | =cut | |
1382 | */ | |
1383 | ||
1384 | #ifdef DEBUGGING | |
1385 | STATIC void | |
e1ec3a88 | 1386 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 | 1387 | { |
97aff369 | 1388 | dVAR; |
53c1dcc0 AL |
1389 | const CV * const outside = CvOUTSIDE(cv); |
1390 | AV* const padlist = CvPADLIST(cv); | |
dd2155a4 DM |
1391 | |
1392 | PerlIO_printf(Perl_debug_log, | |
1393 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1394 | title, | |
1395 | PTR2UV(cv), | |
1396 | (CvANON(cv) ? "ANON" | |
71f882da | 1397 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 DM |
1398 | : (cv == PL_main_cv) ? "MAIN" |
1399 | : CvUNIQUE(cv) ? "UNIQUE" | |
1400 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1401 | PTR2UV(outside), | |
1402 | (!outside ? "null" | |
1403 | : CvANON(outside) ? "ANON" | |
1404 | : (outside == PL_main_cv) ? "MAIN" | |
1405 | : CvUNIQUE(outside) ? "UNIQUE" | |
1406 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1407 | ||
1408 | PerlIO_printf(Perl_debug_log, | |
1409 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1410 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1411 | } | |
1412 | #endif /* DEBUGGING */ | |
1413 | ||
1414 | ||
1415 | ||
1416 | ||
1417 | ||
1418 | /* | |
1419 | =for apidoc cv_clone | |
1420 | ||
1421 | Clone a CV: make a new CV which points to the same code etc, but which | |
1422 | has a newly-created pad built by copying the prototype pad and capturing | |
1423 | any outer lexicals. | |
1424 | ||
1425 | =cut | |
1426 | */ | |
1427 | ||
1428 | CV * | |
1429 | Perl_cv_clone(pTHX_ CV *proto) | |
1430 | { | |
27da23d5 | 1431 | dVAR; |
dd2155a4 | 1432 | I32 ix; |
53c1dcc0 AL |
1433 | AV* const protopadlist = CvPADLIST(proto); |
1434 | const AV* const protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); | |
1435 | const AV* const protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
1436 | SV** const pname = AvARRAY(protopad_name); | |
1437 | SV** const ppad = AvARRAY(protopad); | |
e1ec3a88 AL |
1438 | const I32 fname = AvFILLp(protopad_name); |
1439 | const I32 fpad = AvFILLp(protopad); | |
dd2155a4 | 1440 | CV* cv; |
b5c19bd7 DM |
1441 | SV** outpad; |
1442 | CV* outside; | |
71f882da | 1443 | long depth; |
dd2155a4 DM |
1444 | |
1445 | assert(!CvUNIQUE(proto)); | |
1446 | ||
71f882da DM |
1447 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1448 | * to a prototype; we instead want the cloned parent who called us. | |
1449 | * Note that in general for formats, CvOUTSIDE != find_runcv */ | |
1450 | ||
1451 | outside = CvOUTSIDE(proto); | |
1452 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) | |
1453 | outside = find_runcv(NULL); | |
1454 | depth = CvDEPTH(outside); | |
1455 | assert(depth || SvTYPE(proto) == SVt_PVFM); | |
1456 | if (!depth) | |
1457 | depth = 1; | |
b5c19bd7 DM |
1458 | assert(CvPADLIST(outside)); |
1459 | ||
dd2155a4 DM |
1460 | ENTER; |
1461 | SAVESPTR(PL_compcv); | |
1462 | ||
561b68a9 | 1463 | cv = PL_compcv = (CV*)newSV(0); |
dd2155a4 | 1464 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
7dafbf52 | 1465 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 DM |
1466 | CvCLONED_on(cv); |
1467 | ||
dd2155a4 | 1468 | #ifdef USE_ITHREADS |
aed2304a NC |
1469 | CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto) |
1470 | : savepv(CvFILE(proto)); | |
dd2155a4 DM |
1471 | #else |
1472 | CvFILE(cv) = CvFILE(proto); | |
1473 | #endif | |
1474 | CvGV(cv) = CvGV(proto); | |
1475 | CvSTASH(cv) = CvSTASH(proto); | |
b34c0dd4 | 1476 | OP_REFCNT_LOCK; |
dd2155a4 | 1477 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 | 1478 | OP_REFCNT_UNLOCK; |
dd2155a4 | 1479 | CvSTART(cv) = CvSTART(proto); |
b37c2d43 | 1480 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc_simple(outside); |
b5c19bd7 | 1481 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
dd2155a4 DM |
1482 | |
1483 | if (SvPOK(proto)) | |
b15aece3 | 1484 | sv_setpvn((SV*)cv, SvPVX_const(proto), SvCUR(proto)); |
dd2155a4 | 1485 | |
b7787f18 | 1486 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
dd2155a4 | 1487 | |
b5c19bd7 | 1488 | av_fill(PL_comppad, fpad); |
dd2155a4 DM |
1489 | for (ix = fname; ix >= 0; ix--) |
1490 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1491 | ||
dd2155a4 DM |
1492 | PL_curpad = AvARRAY(PL_comppad); |
1493 | ||
71f882da | 1494 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 | 1495 | |
dd2155a4 | 1496 | for (ix = fpad; ix > 0; ix--) { |
a0714e2c SS |
1497 | SV* const namesv = (ix <= fname) ? pname[ix] : NULL; |
1498 | SV *sv = NULL; | |
71f882da | 1499 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
b5c19bd7 | 1500 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
809abb02 | 1501 | sv = outpad[PARENT_PAD_INDEX(namesv)]; |
71f882da DM |
1502 | assert(sv); |
1503 | /* formats may have an inactive parent */ | |
1504 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { | |
1505 | if (ckWARN(WARN_CLOSURE)) | |
1506 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
b15aece3 | 1507 | "Variable \"%s\" is not available", SvPVX_const(namesv)); |
a0714e2c | 1508 | sv = NULL; |
71f882da DM |
1509 | } |
1510 | else { | |
1511 | assert(!SvPADSTALE(sv)); | |
f84c484e | 1512 | SvREFCNT_inc_simple_void_NN(sv); |
71f882da | 1513 | } |
dd2155a4 | 1514 | } |
71f882da | 1515 | if (!sv) { |
b15aece3 | 1516 | const char sigil = SvPVX_const(namesv)[0]; |
e1ec3a88 | 1517 | if (sigil == '&') |
dd2155a4 | 1518 | sv = SvREFCNT_inc(ppad[ix]); |
e1ec3a88 | 1519 | else if (sigil == '@') |
dd2155a4 | 1520 | sv = (SV*)newAV(); |
e1ec3a88 | 1521 | else if (sigil == '%') |
dd2155a4 DM |
1522 | sv = (SV*)newHV(); |
1523 | else | |
561b68a9 | 1524 | sv = newSV(0); |
235cc2e3 | 1525 | SvPADMY_on(sv); |
dd2155a4 DM |
1526 | } |
1527 | } | |
1528 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
f84c484e | 1529 | sv = SvREFCNT_inc_NN(ppad[ix]); |
dd2155a4 DM |
1530 | } |
1531 | else { | |
561b68a9 | 1532 | sv = newSV(0); |
dd2155a4 | 1533 | SvPADTMP_on(sv); |
dd2155a4 | 1534 | } |
71f882da | 1535 | PL_curpad[ix] = sv; |
dd2155a4 DM |
1536 | } |
1537 | ||
dd2155a4 DM |
1538 | DEBUG_Xv( |
1539 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1540 | cv_dump(outside, "Outside"); | |
1541 | cv_dump(proto, "Proto"); | |
1542 | cv_dump(cv, "To"); | |
1543 | ); | |
1544 | ||
1545 | LEAVE; | |
1546 | ||
1547 | if (CvCONST(cv)) { | |
b5c19bd7 DM |
1548 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1549 | * The prototype was marked as a candiate for const-ization, | |
1550 | * so try to grab the current const value, and if successful, | |
1551 | * turn into a const sub: | |
1552 | */ | |
551405c4 | 1553 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 DM |
1554 | if (const_sv) { |
1555 | SvREFCNT_dec(cv); | |
bd61b366 | 1556 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); |
b5c19bd7 DM |
1557 | } |
1558 | else { | |
1559 | CvCONST_off(cv); | |
1560 | } | |
dd2155a4 DM |
1561 | } |
1562 | ||
1563 | return cv; | |
1564 | } | |
1565 | ||
1566 | ||
1567 | /* | |
1568 | =for apidoc pad_fixup_inner_anons | |
1569 | ||
1570 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1571 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1572 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1573 | |
1574 | =cut | |
1575 | */ | |
1576 | ||
1577 | void | |
1578 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1579 | { | |
97aff369 | 1580 | dVAR; |
dd2155a4 | 1581 | I32 ix; |
66a1b24b AL |
1582 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
1583 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; | |
53c1dcc0 AL |
1584 | SV ** const namepad = AvARRAY(comppad_name); |
1585 | SV ** const curpad = AvARRAY(comppad); | |
294a48e9 AL |
1586 | PERL_UNUSED_ARG(old_cv); |
1587 | ||
dd2155a4 | 1588 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
551405c4 | 1589 | const SV * const namesv = namepad[ix]; |
dd2155a4 | 1590 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 1591 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 1592 | { |
46c461b5 | 1593 | CV * const innercv = (CV*)curpad[ix]; |
7dafbf52 DM |
1594 | assert(CvWEAKOUTSIDE(innercv)); |
1595 | assert(CvOUTSIDE(innercv) == old_cv); | |
1596 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1597 | } |
1598 | } | |
1599 | } | |
1600 | ||
7dafbf52 | 1601 | |
dd2155a4 DM |
1602 | /* |
1603 | =for apidoc pad_push | |
1604 | ||
1605 | Push a new pad frame onto the padlist, unless there's already a pad at | |
26019298 AL |
1606 | this depth, in which case don't bother creating a new one. Then give |
1607 | the new pad an @_ in slot zero. | |
dd2155a4 DM |
1608 | |
1609 | =cut | |
1610 | */ | |
1611 | ||
1612 | void | |
26019298 | 1613 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 | 1614 | { |
97aff369 | 1615 | dVAR; |
b37c2d43 | 1616 | if (depth > AvFILLp(padlist)) { |
44f8325f AL |
1617 | SV** const svp = AvARRAY(padlist); |
1618 | AV* const newpad = newAV(); | |
1619 | SV** const oldpad = AvARRAY(svp[depth-1]); | |
dd2155a4 | 1620 | I32 ix = AvFILLp((AV*)svp[1]); |
e1ec3a88 | 1621 | const I32 names_fill = AvFILLp((AV*)svp[0]); |
44f8325f | 1622 | SV** const names = AvARRAY(svp[0]); |
26019298 AL |
1623 | AV *av; |
1624 | ||
dd2155a4 DM |
1625 | for ( ;ix > 0; ix--) { |
1626 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
b15aece3 | 1627 | const char sigil = SvPVX_const(names[ix])[0]; |
26019298 | 1628 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') { |
dd2155a4 DM |
1629 | /* outer lexical or anon code */ |
1630 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1631 | } | |
1632 | else { /* our own lexical */ | |
26019298 AL |
1633 | SV *sv; |
1634 | if (sigil == '@') | |
1635 | sv = (SV*)newAV(); | |
1636 | else if (sigil == '%') | |
1637 | sv = (SV*)newHV(); | |
dd2155a4 | 1638 | else |
561b68a9 | 1639 | sv = newSV(0); |
26019298 | 1640 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1641 | SvPADMY_on(sv); |
1642 | } | |
1643 | } | |
1644 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
f84c484e | 1645 | av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix])); |
dd2155a4 DM |
1646 | } |
1647 | else { | |
1648 | /* save temporaries on recursion? */ | |
561b68a9 | 1649 | SV * const sv = newSV(0); |
26019298 | 1650 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1651 | SvPADTMP_on(sv); |
1652 | } | |
1653 | } | |
26019298 AL |
1654 | av = newAV(); |
1655 | av_extend(av, 0); | |
1656 | av_store(newpad, 0, (SV*)av); | |
11ca45c0 | 1657 | AvREIFY_only(av); |
26019298 | 1658 | |
dd2155a4 DM |
1659 | av_store(padlist, depth, (SV*)newpad); |
1660 | AvFILLp(padlist) = depth; | |
1661 | } | |
1662 | } | |
b21dc031 AL |
1663 | |
1664 | ||
1665 | HV * | |
1666 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) | |
1667 | { | |
97aff369 | 1668 | dVAR; |
551405c4 | 1669 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
00b1698f | 1670 | if ( SvPAD_TYPED(*av) ) { |
b21dc031 AL |
1671 | return SvSTASH(*av); |
1672 | } | |
5c284bb0 | 1673 | return NULL; |
b21dc031 | 1674 | } |
66610fdd RGS |
1675 | |
1676 | /* | |
1677 | * Local variables: | |
1678 | * c-indentation-style: bsd | |
1679 | * c-basic-offset: 4 | |
1680 | * indent-tabs-mode: t | |
1681 | * End: | |
1682 | * | |
37442d52 RGS |
1683 | * ex: set ts=8 sts=4 sw=4 noet: |
1684 | */ |