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dd2155a4 DM |
1 | /* pad.c |
2 | * | |
fdf8c088 | 3 | * Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 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. | |
3441fb63 NC |
75 | xlow+1..xhigh inclusive in the NV union is a range of cop_seq numbers for |
76 | which the name is valid. For typed lexicals name SV is SVt_PVMG and SvSTASH | |
77 | points at the type. For C<our> lexicals, the type is also SVt_PVMG, with the | |
73d95100 | 78 | SvOURSTASH slot pointing at the stash of the associated global (so that |
931b58fb | 79 | duplicate C<our> declarations in the same package can be detected). SvUVX is |
3441fb63 | 80 | sometimes 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, | |
3441fb63 NC |
84 | the name SV does not use xlow and xhigh to store a cop_seq range, since it is |
85 | in scope throughout. Instead xhigh stores some flags containing info about | |
b5c19bd7 | 86 | the real lexical (is it declared in an anon, and is it capable of being |
3441fb63 | 87 | instantiated multiple times?), and for fake ANONs, xlow contains the index |
b5c19bd7 DM |
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 | |
3441fb63 NC |
114 | #define COP_SEQ_RANGE_LOW_set(sv,val) \ |
115 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END | |
116 | #define COP_SEQ_RANGE_HIGH_set(sv,val) \ | |
117 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END | |
809abb02 | 118 | |
3441fb63 NC |
119 | #define PARENT_PAD_INDEX_set(sv,val) \ |
120 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END | |
121 | #define PARENT_FAKELEX_FLAGS_set(sv,val) \ | |
122 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END | |
dd2155a4 | 123 | |
c8185ac5 | 124 | #define PAD_MAX I32_MAX |
dd2155a4 | 125 | |
1dba731d NC |
126 | #ifdef PERL_MAD |
127 | void pad_peg(const char* s) { | |
128 | static int pegcnt; | |
129 | pegcnt++; | |
130 | } | |
131 | #endif | |
dd2155a4 DM |
132 | |
133 | /* | |
134 | =for apidoc pad_new | |
135 | ||
136 | Create a new compiling padlist, saving and updating the various global | |
137 | vars at the same time as creating the pad itself. The following flags | |
138 | can be OR'ed together: | |
139 | ||
140 | padnew_CLONE this pad is for a cloned CV | |
141 | padnew_SAVE save old globals | |
142 | padnew_SAVESUB also save extra stuff for start of sub | |
143 | ||
144 | =cut | |
145 | */ | |
146 | ||
147 | PADLIST * | |
c7c737cb | 148 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 | 149 | { |
97aff369 | 150 | dVAR; |
e1ec3a88 | 151 | AV *padlist, *padname, *pad; |
dd2155a4 | 152 | |
f3548bdc DM |
153 | ASSERT_CURPAD_LEGAL("pad_new"); |
154 | ||
dd2155a4 DM |
155 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
156 | * vars (based on flags) rather than storing vals + addresses for | |
157 | * each individually. Also see pad_block_start. | |
158 | * XXX DAPM Try to see whether all these conditionals are required | |
159 | */ | |
160 | ||
161 | /* save existing state, ... */ | |
162 | ||
163 | if (flags & padnew_SAVE) { | |
3979c56f | 164 | SAVECOMPPAD(); |
dd2155a4 DM |
165 | SAVESPTR(PL_comppad_name); |
166 | if (! (flags & padnew_CLONE)) { | |
167 | SAVEI32(PL_padix); | |
168 | SAVEI32(PL_comppad_name_fill); | |
169 | SAVEI32(PL_min_intro_pending); | |
170 | SAVEI32(PL_max_intro_pending); | |
b5c19bd7 | 171 | SAVEI32(PL_cv_has_eval); |
dd2155a4 DM |
172 | if (flags & padnew_SAVESUB) { |
173 | SAVEI32(PL_pad_reset_pending); | |
174 | } | |
175 | } | |
176 | } | |
177 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be | |
178 | * saved - check at some pt that this is okay */ | |
179 | ||
180 | /* ... create new pad ... */ | |
181 | ||
182 | padlist = newAV(); | |
183 | padname = newAV(); | |
184 | pad = newAV(); | |
185 | ||
186 | if (flags & padnew_CLONE) { | |
187 | /* XXX DAPM I dont know why cv_clone needs it | |
188 | * doing differently yet - perhaps this separate branch can be | |
189 | * dispensed with eventually ??? | |
190 | */ | |
191 | ||
e1ec3a88 | 192 | AV * const a0 = newAV(); /* will be @_ */ |
dd2155a4 DM |
193 | av_extend(a0, 0); |
194 | av_store(pad, 0, (SV*)a0); | |
11ca45c0 | 195 | AvREIFY_only(a0); |
dd2155a4 DM |
196 | } |
197 | else { | |
a0714e2c | 198 | av_store(pad, 0, NULL); |
dd2155a4 DM |
199 | } |
200 | ||
201 | AvREAL_off(padlist); | |
202 | av_store(padlist, 0, (SV*)padname); | |
203 | av_store(padlist, 1, (SV*)pad); | |
204 | ||
205 | /* ... then update state variables */ | |
206 | ||
207 | PL_comppad_name = (AV*)(*av_fetch(padlist, 0, FALSE)); | |
208 | PL_comppad = (AV*)(*av_fetch(padlist, 1, FALSE)); | |
209 | PL_curpad = AvARRAY(PL_comppad); | |
210 | ||
211 | if (! (flags & padnew_CLONE)) { | |
212 | PL_comppad_name_fill = 0; | |
213 | PL_min_intro_pending = 0; | |
214 | PL_padix = 0; | |
b5c19bd7 | 215 | PL_cv_has_eval = 0; |
dd2155a4 DM |
216 | } |
217 | ||
218 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 | 219 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
dd2155a4 | 220 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
b5c19bd7 | 221 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
dd2155a4 DM |
222 | PTR2UV(padname), (UV)flags |
223 | ) | |
224 | ); | |
225 | ||
226 | return (PADLIST*)padlist; | |
227 | } | |
228 | ||
229 | /* | |
230 | =for apidoc pad_undef | |
231 | ||
232 | Free the padlist associated with a CV. | |
233 | If parts of it happen to be current, we null the relevant | |
234 | PL_*pad* global vars so that we don't have any dangling references left. | |
235 | We also repoint the CvOUTSIDE of any about-to-be-orphaned | |
a3985cdc | 236 | inner subs to the outer of this cv. |
dd2155a4 | 237 | |
7dafbf52 DM |
238 | (This function should really be called pad_free, but the name was already |
239 | taken) | |
240 | ||
dd2155a4 DM |
241 | =cut |
242 | */ | |
243 | ||
244 | void | |
a3985cdc | 245 | Perl_pad_undef(pTHX_ CV* cv) |
dd2155a4 | 246 | { |
97aff369 | 247 | dVAR; |
dd2155a4 | 248 | I32 ix; |
b64e5050 | 249 | const PADLIST * const padlist = CvPADLIST(cv); |
dd2155a4 | 250 | |
1dba731d | 251 | pad_peg("pad_undef"); |
dd2155a4 DM |
252 | if (!padlist) |
253 | return; | |
0565a181 | 254 | if (SvIS_FREED(padlist)) /* may be during global destruction */ |
dd2155a4 DM |
255 | return; |
256 | ||
257 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
b5c19bd7 DM |
258 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", |
259 | PTR2UV(cv), PTR2UV(padlist)) | |
dd2155a4 DM |
260 | ); |
261 | ||
7dafbf52 DM |
262 | /* detach any '&' anon children in the pad; if afterwards they |
263 | * are still live, fix up their CvOUTSIDEs to point to our outside, | |
264 | * bypassing us. */ | |
265 | /* XXX DAPM for efficiency, we should only do this if we know we have | |
266 | * children, or integrate this loop with general cleanup */ | |
dd2155a4 | 267 | |
7dafbf52 | 268 | if (!PL_dirty) { /* don't bother during global destruction */ |
53c1dcc0 | 269 | CV * const outercv = CvOUTSIDE(cv); |
e1ec3a88 | 270 | const U32 seq = CvOUTSIDE_SEQ(cv); |
53c1dcc0 AL |
271 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
272 | SV ** const namepad = AvARRAY(comppad_name); | |
273 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; | |
274 | SV ** const curpad = AvARRAY(comppad); | |
dd2155a4 | 275 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
504618e9 | 276 | SV * const namesv = namepad[ix]; |
dd2155a4 | 277 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 278 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 279 | { |
7fc63493 | 280 | CV * const innercv = (CV*)curpad[ix]; |
10dc53a8 DM |
281 | U32 inner_rc = SvREFCNT(innercv); |
282 | assert(inner_rc); | |
a0714e2c | 283 | namepad[ix] = NULL; |
7dafbf52 | 284 | SvREFCNT_dec(namesv); |
01773faa DM |
285 | |
286 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ | |
a0714e2c | 287 | curpad[ix] = NULL; |
01773faa | 288 | SvREFCNT_dec(innercv); |
10dc53a8 | 289 | inner_rc--; |
01773faa | 290 | } |
b37c2d43 AL |
291 | |
292 | /* in use, not just a prototype */ | |
293 | if (inner_rc && (CvOUTSIDE(innercv) == cv)) { | |
7dafbf52 | 294 | assert(CvWEAKOUTSIDE(innercv)); |
9d1ce744 JH |
295 | /* don't relink to grandfather if he's being freed */ |
296 | if (outercv && SvREFCNT(outercv)) { | |
297 | CvWEAKOUTSIDE_off(innercv); | |
298 | CvOUTSIDE(innercv) = outercv; | |
299 | CvOUTSIDE_SEQ(innercv) = seq; | |
f84c484e | 300 | SvREFCNT_inc_simple_void_NN(outercv); |
9d1ce744 JH |
301 | } |
302 | else { | |
601f1833 | 303 | CvOUTSIDE(innercv) = NULL; |
9d1ce744 | 304 | } |
dd2155a4 DM |
305 | } |
306 | } | |
307 | } | |
308 | } | |
7dafbf52 | 309 | |
dd2155a4 DM |
310 | ix = AvFILLp(padlist); |
311 | while (ix >= 0) { | |
b37c2d43 AL |
312 | const SV* const sv = AvARRAY(padlist)[ix--]; |
313 | if (sv) { | |
314 | if (sv == (SV*)PL_comppad_name) | |
315 | PL_comppad_name = NULL; | |
316 | else if (sv == (SV*)PL_comppad) { | |
317 | PL_comppad = NULL; | |
318 | PL_curpad = NULL; | |
319 | } | |
dd2155a4 DM |
320 | } |
321 | SvREFCNT_dec(sv); | |
322 | } | |
323 | SvREFCNT_dec((SV*)CvPADLIST(cv)); | |
4608196e | 324 | CvPADLIST(cv) = NULL; |
dd2155a4 DM |
325 | } |
326 | ||
327 | ||
328 | ||
329 | ||
330 | /* | |
331 | =for apidoc pad_add_name | |
332 | ||
b5c19bd7 DM |
333 | Create a new name and associated PADMY SV in the current pad; return the |
334 | offset. | |
dd2155a4 DM |
335 | If C<typestash> is valid, the name is for a typed lexical; set the |
336 | name's stash to that value. | |
337 | If C<ourstash> is valid, it's an our lexical, set the name's | |
73d95100 | 338 | SvOURSTASH to that value |
dd2155a4 | 339 | |
dd2155a4 DM |
340 | If fake, it means we're cloning an existing entry |
341 | ||
342 | =cut | |
343 | */ | |
344 | ||
dd2155a4 | 345 | PADOFFSET |
952306ac | 346 | Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake, bool state) |
dd2155a4 | 347 | { |
97aff369 | 348 | dVAR; |
504618e9 | 349 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
561b68a9 | 350 | SV* const namesv = newSV(0); |
dd2155a4 | 351 | |
f3548bdc DM |
352 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
353 | ||
dd2155a4 | 354 | |
2892acdb | 355 | sv_upgrade(namesv, (ourstash || typestash) ? SVt_PVMG : SVt_PVNV); |
dd2155a4 DM |
356 | sv_setpv(namesv, name); |
357 | ||
358 | if (typestash) { | |
63f10712 | 359 | assert(SvTYPE(namesv) == SVt_PVMG); |
00b1698f | 360 | SvPAD_TYPED_on(namesv); |
b37c2d43 | 361 | SvSTASH_set(namesv, (HV*)SvREFCNT_inc_simple_NN((SV*)typestash)); |
dd2155a4 DM |
362 | } |
363 | if (ourstash) { | |
00b1698f | 364 | SvPAD_OUR_on(namesv); |
73d95100 | 365 | SvOURSTASH_set(namesv, ourstash); |
f84c484e | 366 | SvREFCNT_inc_simple_void_NN(ourstash); |
dd2155a4 | 367 | } |
952306ac RGS |
368 | else if (state) { |
369 | SvPAD_STATE_on(namesv); | |
370 | } | |
dd2155a4 DM |
371 | |
372 | av_store(PL_comppad_name, offset, namesv); | |
b5c19bd7 | 373 | if (fake) { |
dd2155a4 | 374 | SvFAKE_on(namesv); |
b5c19bd7 DM |
375 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
376 | "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); | |
377 | } | |
dd2155a4 | 378 | else { |
ee6cee0c | 379 | /* not yet introduced */ |
809abb02 NC |
380 | COP_SEQ_RANGE_LOW_set(namesv, PAD_MAX); /* min */ |
381 | COP_SEQ_RANGE_HIGH_set(namesv, 0); /* max */ | |
ee6cee0c | 382 | |
dd2155a4 DM |
383 | if (!PL_min_intro_pending) |
384 | PL_min_intro_pending = offset; | |
385 | PL_max_intro_pending = offset; | |
b5c19bd7 | 386 | /* if it's not a simple scalar, replace with an AV or HV */ |
f3548bdc DM |
387 | /* XXX DAPM since slot has been allocated, replace |
388 | * av_store with PL_curpad[offset] ? */ | |
dd2155a4 DM |
389 | if (*name == '@') |
390 | av_store(PL_comppad, offset, (SV*)newAV()); | |
391 | else if (*name == '%') | |
392 | av_store(PL_comppad, offset, (SV*)newHV()); | |
393 | SvPADMY_on(PL_curpad[offset]); | |
b5c19bd7 DM |
394 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
395 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", | |
396 | (long)offset, name, PTR2UV(PL_curpad[offset]))); | |
dd2155a4 DM |
397 | } |
398 | ||
399 | return offset; | |
400 | } | |
401 | ||
402 | ||
403 | ||
404 | ||
405 | /* | |
406 | =for apidoc pad_alloc | |
407 | ||
408 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto | |
409 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards | |
cf525c36 | 410 | for a slot which has no name and no active value. |
dd2155a4 DM |
411 | |
412 | =cut | |
413 | */ | |
414 | ||
415 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), | |
416 | * or at least rationalise ??? */ | |
6d640399 NC |
417 | /* And flag whether the incoming name is UTF8 or 8 bit? |
418 | Could do this either with the +ve/-ve hack of the HV code, or expanding | |
419 | the flag bits. Either way, this makes proper Unicode safe pad support. | |
6d640399 NC |
420 | NWC |
421 | */ | |
dd2155a4 DM |
422 | |
423 | PADOFFSET | |
424 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
425 | { | |
97aff369 | 426 | dVAR; |
dd2155a4 DM |
427 | SV *sv; |
428 | I32 retval; | |
429 | ||
6136c704 | 430 | PERL_UNUSED_ARG(optype); |
f3548bdc DM |
431 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
432 | ||
dd2155a4 DM |
433 | if (AvARRAY(PL_comppad) != PL_curpad) |
434 | Perl_croak(aTHX_ "panic: pad_alloc"); | |
435 | if (PL_pad_reset_pending) | |
436 | pad_reset(); | |
437 | if (tmptype & SVs_PADMY) { | |
235cc2e3 | 438 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
dd2155a4 DM |
439 | retval = AvFILLp(PL_comppad); |
440 | } | |
441 | else { | |
551405c4 | 442 | SV * const * const names = AvARRAY(PL_comppad_name); |
e1ec3a88 | 443 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
dd2155a4 DM |
444 | for (;;) { |
445 | /* | |
446 | * "foreach" index vars temporarily become aliases to non-"my" | |
447 | * values. Thus we must skip, not just pad values that are | |
448 | * marked as current pad values, but also those with names. | |
449 | */ | |
450 | /* HVDS why copy to sv here? we don't seem to use it */ | |
451 | if (++PL_padix <= names_fill && | |
452 | (sv = names[PL_padix]) && sv != &PL_sv_undef) | |
453 | continue; | |
454 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); | |
455 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && | |
456 | !IS_PADGV(sv) && !IS_PADCONST(sv)) | |
457 | break; | |
458 | } | |
459 | retval = PL_padix; | |
460 | } | |
461 | SvFLAGS(sv) |= tmptype; | |
462 | PL_curpad = AvARRAY(PL_comppad); | |
463 | ||
464 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
465 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", | |
466 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
467 | PL_op_name[optype])); | |
fd0854ff DM |
468 | #ifdef DEBUG_LEAKING_SCALARS |
469 | sv->sv_debug_optype = optype; | |
470 | sv->sv_debug_inpad = 1; | |
fd0854ff | 471 | #endif |
a212c8b5 | 472 | return (PADOFFSET)retval; |
dd2155a4 DM |
473 | } |
474 | ||
475 | /* | |
476 | =for apidoc pad_add_anon | |
477 | ||
478 | Add an anon code entry to the current compiling pad | |
479 | ||
480 | =cut | |
481 | */ | |
482 | ||
483 | PADOFFSET | |
484 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) | |
485 | { | |
97aff369 | 486 | dVAR; |
dd2155a4 | 487 | PADOFFSET ix; |
561b68a9 | 488 | SV* const name = newSV(0); |
1dba731d | 489 | pad_peg("add_anon"); |
dd2155a4 DM |
490 | sv_upgrade(name, SVt_PVNV); |
491 | sv_setpvn(name, "&", 1); | |
809abb02 NC |
492 | /* Are these two actually ever read? */ |
493 | COP_SEQ_RANGE_HIGH_set(name, ~0); | |
494 | COP_SEQ_RANGE_LOW_set(name, 1); | |
dd2155a4 DM |
495 | ix = pad_alloc(op_type, SVs_PADMY); |
496 | av_store(PL_comppad_name, ix, name); | |
f3548bdc | 497 | /* XXX DAPM use PL_curpad[] ? */ |
dd2155a4 DM |
498 | av_store(PL_comppad, ix, sv); |
499 | SvPADMY_on(sv); | |
7dafbf52 DM |
500 | |
501 | /* to avoid ref loops, we never have parent + child referencing each | |
502 | * other simultaneously */ | |
503 | if (CvOUTSIDE((CV*)sv)) { | |
504 | assert(!CvWEAKOUTSIDE((CV*)sv)); | |
505 | CvWEAKOUTSIDE_on((CV*)sv); | |
506 | SvREFCNT_dec(CvOUTSIDE((CV*)sv)); | |
507 | } | |
dd2155a4 DM |
508 | return ix; |
509 | } | |
510 | ||
511 | ||
512 | ||
513 | /* | |
514 | =for apidoc pad_check_dup | |
515 | ||
516 | Check for duplicate declarations: report any of: | |
517 | * a my in the current scope with the same name; | |
518 | * an our (anywhere in the pad) with the same name and the same stash | |
519 | as C<ourstash> | |
520 | C<is_our> indicates that the name to check is an 'our' declaration | |
521 | ||
522 | =cut | |
523 | */ | |
524 | ||
525 | /* XXX DAPM integrate this into pad_add_name ??? */ | |
526 | ||
527 | void | |
e1ec3a88 | 528 | Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash) |
dd2155a4 | 529 | { |
97aff369 | 530 | dVAR; |
53c1dcc0 | 531 | SV **svp; |
dd2155a4 DM |
532 | PADOFFSET top, off; |
533 | ||
f3548bdc | 534 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
041457d9 | 535 | if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) |
dd2155a4 DM |
536 | return; /* nothing to check */ |
537 | ||
538 | svp = AvARRAY(PL_comppad_name); | |
539 | top = AvFILLp(PL_comppad_name); | |
540 | /* check the current scope */ | |
541 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same | |
542 | * type ? */ | |
543 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { | |
53c1dcc0 AL |
544 | SV * const sv = svp[off]; |
545 | if (sv | |
dd2155a4 | 546 | && sv != &PL_sv_undef |
ee6cee0c | 547 | && !SvFAKE(sv) |
809abb02 | 548 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
b15aece3 | 549 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 | 550 | { |
00b1698f | 551 | if (is_our && (SvPAD_OUR(sv))) |
7f73a9f1 | 552 | break; /* "our" masking "our" */ |
dd2155a4 DM |
553 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
554 | "\"%s\" variable %s masks earlier declaration in same %s", | |
952306ac | 555 | (is_our ? "our" : PL_in_my == KEY_my ? "my" : "state"), |
dd2155a4 | 556 | name, |
809abb02 | 557 | (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX ? "scope" : "statement")); |
dd2155a4 DM |
558 | --off; |
559 | break; | |
560 | } | |
561 | } | |
562 | /* check the rest of the pad */ | |
563 | if (is_our) { | |
564 | do { | |
53c1dcc0 AL |
565 | SV * const sv = svp[off]; |
566 | if (sv | |
dd2155a4 | 567 | && sv != &PL_sv_undef |
ee6cee0c | 568 | && !SvFAKE(sv) |
809abb02 | 569 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
73d95100 | 570 | && SvOURSTASH(sv) == ourstash |
b15aece3 | 571 | && strEQ(name, SvPVX_const(sv))) |
dd2155a4 DM |
572 | { |
573 | Perl_warner(aTHX_ packWARN(WARN_MISC), | |
574 | "\"our\" variable %s redeclared", name); | |
624f69f5 | 575 | if ((I32)off <= PL_comppad_name_floor) |
7f73a9f1 RGS |
576 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
577 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
dd2155a4 DM |
578 | break; |
579 | } | |
580 | } while ( off-- > 0 ); | |
581 | } | |
582 | } | |
583 | ||
584 | ||
dd2155a4 DM |
585 | /* |
586 | =for apidoc pad_findmy | |
587 | ||
588 | Given a lexical name, try to find its offset, first in the current pad, | |
589 | or failing that, in the pads of any lexically enclosing subs (including | |
590 | the complications introduced by eval). If the name is found in an outer pad, | |
591 | then a fake entry is added to the current pad. | |
592 | Returns the offset in the current pad, or NOT_IN_PAD on failure. | |
593 | ||
594 | =cut | |
595 | */ | |
596 | ||
597 | PADOFFSET | |
e1ec3a88 | 598 | Perl_pad_findmy(pTHX_ const char *name) |
dd2155a4 | 599 | { |
97aff369 | 600 | dVAR; |
b5c19bd7 DM |
601 | SV *out_sv; |
602 | int out_flags; | |
929a0744 | 603 | I32 offset; |
e1ec3a88 | 604 | const AV *nameav; |
929a0744 | 605 | SV **name_svp; |
dd2155a4 | 606 | |
1dba731d | 607 | pad_peg("pad_findmy"); |
9f7d9405 | 608 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
4608196e | 609 | NULL, &out_sv, &out_flags); |
9f7d9405 | 610 | if ((PADOFFSET)offset != NOT_IN_PAD) |
929a0744 DM |
611 | return offset; |
612 | ||
613 | /* look for an our that's being introduced; this allows | |
614 | * our $foo = 0 unless defined $foo; | |
615 | * to not give a warning. (Yes, this is a hack) */ | |
616 | ||
617 | nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; | |
618 | name_svp = AvARRAY(nameav); | |
619 | for (offset = AvFILLp(nameav); offset > 0; offset--) { | |
551405c4 | 620 | const SV * const namesv = name_svp[offset]; |
929a0744 DM |
621 | if (namesv && namesv != &PL_sv_undef |
622 | && !SvFAKE(namesv) | |
00b1698f | 623 | && (SvPAD_OUR(namesv)) |
b15aece3 | 624 | && strEQ(SvPVX_const(namesv), name) |
809abb02 | 625 | && COP_SEQ_RANGE_LOW(namesv) == PAD_MAX /* min */ |
929a0744 DM |
626 | ) |
627 | return offset; | |
628 | } | |
629 | return NOT_IN_PAD; | |
dd2155a4 DM |
630 | } |
631 | ||
e1f795dc RGS |
632 | /* |
633 | * Returns the offset of a lexical $_, if there is one, at run time. | |
634 | * Used by the UNDERBAR XS macro. | |
635 | */ | |
636 | ||
637 | PADOFFSET | |
29289021 | 638 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc | 639 | { |
97aff369 | 640 | dVAR; |
e1f795dc RGS |
641 | SV *out_sv; |
642 | int out_flags; | |
643 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, | |
4608196e | 644 | NULL, &out_sv, &out_flags); |
e1f795dc | 645 | } |
dd2155a4 | 646 | |
dd2155a4 DM |
647 | /* |
648 | =for apidoc pad_findlex | |
649 | ||
650 | Find a named lexical anywhere in a chain of nested pads. Add fake entries | |
b5c19bd7 DM |
651 | in the inner pads if it's found in an outer one. |
652 | ||
653 | Returns the offset in the bottom pad of the lex or the fake lex. | |
654 | cv is the CV in which to start the search, and seq is the current cop_seq | |
655 | to match against. If warn is true, print appropriate warnings. The out_* | |
656 | vars return values, and so are pointers to where the returned values | |
657 | should be stored. out_capture, if non-null, requests that the innermost | |
658 | instance of the lexical is captured; out_name_sv is set to the innermost | |
659 | matched namesv or fake namesv; out_flags returns the flags normally | |
660 | associated with the IVX field of a fake namesv. | |
661 | ||
662 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, | |
663 | then comes back down, adding fake entries as it goes. It has to be this way | |
3441fb63 | 664 | because fake namesvs in anon protoypes have to store in xlow the index into |
b5c19bd7 | 665 | the parent pad. |
dd2155a4 DM |
666 | |
667 | =cut | |
668 | */ | |
669 | ||
b5c19bd7 DM |
670 | /* the CV has finished being compiled. This is not a sufficient test for |
671 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
672 | #define CvCOMPILED(cv) CvROOT(cv) | |
673 | ||
71f882da DM |
674 | /* the CV does late binding of its lexicals */ |
675 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) | |
676 | ||
b5c19bd7 | 677 | |
dd2155a4 | 678 | STATIC PADOFFSET |
e1ec3a88 | 679 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
b5c19bd7 | 680 | SV** out_capture, SV** out_name_sv, int *out_flags) |
dd2155a4 | 681 | { |
97aff369 | 682 | dVAR; |
b5c19bd7 DM |
683 | I32 offset, new_offset; |
684 | SV *new_capture; | |
685 | SV **new_capturep; | |
b64e5050 | 686 | const AV * const padlist = CvPADLIST(cv); |
dd2155a4 | 687 | |
b5c19bd7 | 688 | *out_flags = 0; |
a3985cdc | 689 | |
b5c19bd7 DM |
690 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
691 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", | |
692 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); | |
dd2155a4 | 693 | |
b5c19bd7 | 694 | /* first, search this pad */ |
dd2155a4 | 695 | |
b5c19bd7 DM |
696 | if (padlist) { /* not an undef CV */ |
697 | I32 fake_offset = 0; | |
551405c4 AL |
698 | const AV * const nameav = (AV*)AvARRAY(padlist)[0]; |
699 | SV * const * const name_svp = AvARRAY(nameav); | |
ee6cee0c | 700 | |
b5c19bd7 | 701 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
551405c4 | 702 | const SV * const namesv = name_svp[offset]; |
b5c19bd7 | 703 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 704 | && strEQ(SvPVX_const(namesv), name)) |
b5c19bd7 DM |
705 | { |
706 | if (SvFAKE(namesv)) | |
707 | fake_offset = offset; /* in case we don't find a real one */ | |
809abb02 NC |
708 | else if ( seq > COP_SEQ_RANGE_LOW(namesv) /* min */ |
709 | && seq <= COP_SEQ_RANGE_HIGH(namesv)) /* max */ | |
b5c19bd7 | 710 | break; |
ee6cee0c DM |
711 | } |
712 | } | |
713 | ||
b5c19bd7 DM |
714 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
715 | if (offset > 0) { /* not fake */ | |
716 | fake_offset = 0; | |
717 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
718 | ||
719 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
720 | * instances. For now, we just test !CvUNIQUE(cv), but | |
721 | * ideally, we should detect my's declared within loops | |
722 | * etc - this would allow a wider range of 'not stayed | |
723 | * shared' warnings. We also treated alreadly-compiled | |
724 | * lexes as not multi as viewed from evals. */ | |
725 | ||
726 | *out_flags = CvANON(cv) ? | |
727 | PAD_FAKELEX_ANON : | |
728 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
729 | ? PAD_FAKELEX_MULTI : 0; | |
730 | ||
731 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
809abb02 NC |
732 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%lu,%lu)\n", |
733 | PTR2UV(cv), (long)offset, | |
734 | (unsigned long)COP_SEQ_RANGE_LOW(*out_name_sv), | |
735 | (unsigned long)COP_SEQ_RANGE_HIGH(*out_name_sv))); | |
b5c19bd7 DM |
736 | } |
737 | else { /* fake match */ | |
738 | offset = fake_offset; | |
739 | *out_name_sv = name_svp[offset]; /* return the namesv */ | |
809abb02 | 740 | *out_flags = PARENT_FAKELEX_FLAGS(*out_name_sv); |
b5c19bd7 | 741 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
19a5c512 | 742 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
b5c19bd7 | 743 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
809abb02 | 744 | (unsigned long) PARENT_PAD_INDEX(*out_name_sv) |
b5c19bd7 DM |
745 | )); |
746 | } | |
dd2155a4 | 747 | |
b5c19bd7 | 748 | /* return the lex? */ |
dd2155a4 | 749 | |
b5c19bd7 | 750 | if (out_capture) { |
dd2155a4 | 751 | |
b5c19bd7 | 752 | /* our ? */ |
00b1698f | 753 | if (SvPAD_OUR(*out_name_sv)) { |
a0714e2c | 754 | *out_capture = NULL; |
b5c19bd7 DM |
755 | return offset; |
756 | } | |
ee6cee0c | 757 | |
b5c19bd7 DM |
758 | /* trying to capture from an anon prototype? */ |
759 | if (CvCOMPILED(cv) | |
760 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
761 | : *out_flags & PAD_FAKELEX_ANON) | |
762 | { | |
763 | if (warn && ckWARN(WARN_CLOSURE)) | |
764 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
765 | "Variable \"%s\" is not available", name); | |
a0714e2c | 766 | *out_capture = NULL; |
b5c19bd7 | 767 | } |
ee6cee0c | 768 | |
b5c19bd7 DM |
769 | /* real value */ |
770 | else { | |
771 | int newwarn = warn; | |
772 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
773 | && warn && ckWARN(WARN_CLOSURE)) { | |
774 | newwarn = 0; | |
775 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
776 | "Variable \"%s\" will not stay shared", name); | |
777 | } | |
dd2155a4 | 778 | |
b5c19bd7 DM |
779 | if (fake_offset && CvANON(cv) |
780 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
781 | { | |
782 | SV *n; | |
783 | /* not yet caught - look further up */ | |
784 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
785 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", | |
786 | PTR2UV(cv))); | |
787 | n = *out_name_sv; | |
282e1742 DM |
788 | (void) pad_findlex(name, CvOUTSIDE(cv), |
789 | CvOUTSIDE_SEQ(cv), | |
b5c19bd7 DM |
790 | newwarn, out_capture, out_name_sv, out_flags); |
791 | *out_name_sv = n; | |
792 | return offset; | |
dd2155a4 | 793 | } |
b5c19bd7 DM |
794 | |
795 | *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ | |
796 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; | |
797 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
798 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", | |
19a5c512 | 799 | PTR2UV(cv), PTR2UV(*out_capture))); |
b5c19bd7 DM |
800 | |
801 | if (SvPADSTALE(*out_capture)) { | |
802 | if (ckWARN(WARN_CLOSURE)) | |
ee6cee0c | 803 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
b5c19bd7 | 804 | "Variable \"%s\" is not available", name); |
a0714e2c | 805 | *out_capture = NULL; |
dd2155a4 DM |
806 | } |
807 | } | |
b5c19bd7 DM |
808 | if (!*out_capture) { |
809 | if (*name == '@') | |
810 | *out_capture = sv_2mortal((SV*)newAV()); | |
811 | else if (*name == '%') | |
812 | *out_capture = sv_2mortal((SV*)newHV()); | |
813 | else | |
814 | *out_capture = sv_newmortal(); | |
815 | } | |
dd2155a4 | 816 | } |
b5c19bd7 DM |
817 | |
818 | return offset; | |
ee6cee0c | 819 | } |
b5c19bd7 DM |
820 | } |
821 | ||
822 | /* it's not in this pad - try above */ | |
823 | ||
824 | if (!CvOUTSIDE(cv)) | |
825 | return NOT_IN_PAD; | |
9f7d9405 | 826 | |
b5c19bd7 | 827 | /* out_capture non-null means caller wants us to capture lex; in |
71f882da | 828 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 829 | new_capturep = out_capture ? out_capture : |
4608196e | 830 | CvLATE(cv) ? NULL : &new_capture; |
b5c19bd7 DM |
831 | |
832 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
833 | new_capturep, out_name_sv, out_flags); | |
9f7d9405 | 834 | if ((PADOFFSET)offset == NOT_IN_PAD) |
b5c19bd7 | 835 | return NOT_IN_PAD; |
9f7d9405 | 836 | |
b5c19bd7 DM |
837 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
838 | ||
839 | /* don't add new fake entries (via eval) to CVs that we have already | |
840 | * finished compiling, or to undef CVs */ | |
841 | if (CvCOMPILED(cv) || !padlist) | |
842 | return 0; /* this dummy (and invalid) value isnt used by the caller */ | |
843 | ||
844 | { | |
845 | SV *new_namesv; | |
53c1dcc0 AL |
846 | AV * const ocomppad_name = PL_comppad_name; |
847 | PAD * const ocomppad = PL_comppad; | |
b5c19bd7 DM |
848 | PL_comppad_name = (AV*)AvARRAY(padlist)[0]; |
849 | PL_comppad = (AV*)AvARRAY(padlist)[1]; | |
850 | PL_curpad = AvARRAY(PL_comppad); | |
851 | ||
852 | new_offset = pad_add_name( | |
b15aece3 | 853 | SvPVX_const(*out_name_sv), |
00b1698f | 854 | SvPAD_TYPED(*out_name_sv) |
5c284bb0 | 855 | ? SvSTASH(*out_name_sv) : NULL, |
73d95100 | 856 | SvOURSTASH(*out_name_sv), |
952306ac RGS |
857 | 1, /* fake */ |
858 | 0 /* not a state variable */ | |
b5c19bd7 DM |
859 | ); |
860 | ||
861 | new_namesv = AvARRAY(PL_comppad_name)[new_offset]; | |
809abb02 | 862 | PARENT_FAKELEX_FLAGS_set(new_namesv, *out_flags); |
b5c19bd7 | 863 | |
809abb02 | 864 | PARENT_PAD_INDEX_set(new_namesv, 0); |
00b1698f | 865 | if (SvPAD_OUR(new_namesv)) { |
6f207bd3 | 866 | NOOP; /* do nothing */ |
b5c19bd7 | 867 | } |
71f882da | 868 | else if (CvLATE(cv)) { |
b5c19bd7 | 869 | /* delayed creation - just note the offset within parent pad */ |
809abb02 | 870 | PARENT_PAD_INDEX_set(new_namesv, offset); |
b5c19bd7 DM |
871 | CvCLONE_on(cv); |
872 | } | |
873 | else { | |
874 | /* immediate creation - capture outer value right now */ | |
875 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
876 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
877 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", | |
878 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
dd2155a4 | 879 | } |
b5c19bd7 | 880 | *out_name_sv = new_namesv; |
809abb02 | 881 | *out_flags = PARENT_FAKELEX_FLAGS(new_namesv); |
b5c19bd7 DM |
882 | |
883 | PL_comppad_name = ocomppad_name; | |
884 | PL_comppad = ocomppad; | |
4608196e | 885 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL; |
dd2155a4 | 886 | } |
b5c19bd7 | 887 | return new_offset; |
dd2155a4 DM |
888 | } |
889 | ||
fb8a9836 AL |
890 | |
891 | #ifdef DEBUGGING | |
dd2155a4 DM |
892 | /* |
893 | =for apidoc pad_sv | |
894 | ||
895 | Get the value at offset po in the current pad. | |
896 | Use macro PAD_SV instead of calling this function directly. | |
897 | ||
898 | =cut | |
899 | */ | |
900 | ||
901 | ||
902 | SV * | |
903 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
904 | { | |
97aff369 | 905 | dVAR; |
f3548bdc | 906 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 907 | |
dd2155a4 DM |
908 | if (!po) |
909 | Perl_croak(aTHX_ "panic: pad_sv po"); | |
dd2155a4 DM |
910 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
911 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 912 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
dd2155a4 DM |
913 | ); |
914 | return PL_curpad[po]; | |
915 | } | |
916 | ||
917 | ||
918 | /* | |
919 | =for apidoc pad_setsv | |
920 | ||
921 | Set the entry at offset po in the current pad to sv. | |
922 | Use the macro PAD_SETSV() rather than calling this function directly. | |
923 | ||
924 | =cut | |
925 | */ | |
926 | ||
dd2155a4 DM |
927 | void |
928 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
929 | { | |
97aff369 | 930 | dVAR; |
f3548bdc | 931 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
932 | |
933 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
934 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", | |
f3548bdc | 935 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
dd2155a4 DM |
936 | ); |
937 | PL_curpad[po] = sv; | |
938 | } | |
939 | #endif | |
940 | ||
941 | ||
942 | ||
943 | /* | |
944 | =for apidoc pad_block_start | |
945 | ||
946 | Update the pad compilation state variables on entry to a new block | |
947 | ||
948 | =cut | |
949 | */ | |
950 | ||
951 | /* XXX DAPM perhaps: | |
952 | * - integrate this in general state-saving routine ??? | |
953 | * - combine with the state-saving going on in pad_new ??? | |
954 | * - introduce a new SAVE type that does all this in one go ? | |
955 | */ | |
956 | ||
957 | void | |
958 | Perl_pad_block_start(pTHX_ int full) | |
959 | { | |
97aff369 | 960 | dVAR; |
f3548bdc | 961 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
dd2155a4 DM |
962 | SAVEI32(PL_comppad_name_floor); |
963 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); | |
964 | if (full) | |
965 | PL_comppad_name_fill = PL_comppad_name_floor; | |
966 | if (PL_comppad_name_floor < 0) | |
967 | PL_comppad_name_floor = 0; | |
968 | SAVEI32(PL_min_intro_pending); | |
969 | SAVEI32(PL_max_intro_pending); | |
970 | PL_min_intro_pending = 0; | |
971 | SAVEI32(PL_comppad_name_fill); | |
972 | SAVEI32(PL_padix_floor); | |
973 | PL_padix_floor = PL_padix; | |
974 | PL_pad_reset_pending = FALSE; | |
975 | } | |
976 | ||
977 | ||
978 | /* | |
979 | =for apidoc intro_my | |
980 | ||
981 | "Introduce" my variables to visible status. | |
982 | ||
983 | =cut | |
984 | */ | |
985 | ||
986 | U32 | |
987 | Perl_intro_my(pTHX) | |
988 | { | |
97aff369 | 989 | dVAR; |
dd2155a4 | 990 | SV **svp; |
dd2155a4 DM |
991 | I32 i; |
992 | ||
f3548bdc | 993 | ASSERT_CURPAD_ACTIVE("intro_my"); |
dd2155a4 DM |
994 | if (! PL_min_intro_pending) |
995 | return PL_cop_seqmax; | |
996 | ||
997 | svp = AvARRAY(PL_comppad_name); | |
998 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { | |
53c1dcc0 AL |
999 | SV * const sv = svp[i]; |
1000 | ||
809abb02 NC |
1001 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !COP_SEQ_RANGE_HIGH(sv)) { |
1002 | COP_SEQ_RANGE_HIGH_set(sv, PAD_MAX); /* Don't know scope end yet. */ | |
1003 | COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax); | |
dd2155a4 | 1004 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
809abb02 | 1005 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
b15aece3 | 1006 | (long)i, SvPVX_const(sv), |
809abb02 NC |
1007 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
1008 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
dd2155a4 DM |
1009 | ); |
1010 | } | |
1011 | } | |
1012 | PL_min_intro_pending = 0; | |
1013 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
1014 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1015 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); | |
1016 | ||
1017 | return PL_cop_seqmax++; | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | =for apidoc pad_leavemy | |
1022 | ||
1023 | Cleanup at end of scope during compilation: set the max seq number for | |
1024 | lexicals in this scope and warn of any lexicals that never got introduced. | |
1025 | ||
1026 | =cut | |
1027 | */ | |
1028 | ||
1029 | void | |
1030 | Perl_pad_leavemy(pTHX) | |
1031 | { | |
97aff369 | 1032 | dVAR; |
dd2155a4 | 1033 | I32 off; |
551405c4 | 1034 | SV * const * const svp = AvARRAY(PL_comppad_name); |
dd2155a4 DM |
1035 | |
1036 | PL_pad_reset_pending = FALSE; | |
1037 | ||
f3548bdc | 1038 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 DM |
1039 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
1040 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { | |
53c1dcc0 AL |
1041 | const SV * const sv = svp[off]; |
1042 | if (sv && sv != &PL_sv_undef | |
ee6cee0c | 1043 | && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) |
dd2155a4 | 1044 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
95b63a38 | 1045 | "%"SVf" never introduced", |
be2597df | 1046 | SVfARG(sv)); |
dd2155a4 DM |
1047 | } |
1048 | } | |
1049 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
1050 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { | |
53c1dcc0 | 1051 | const SV * const sv = svp[off]; |
809abb02 NC |
1052 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && COP_SEQ_RANGE_HIGH(sv) == PAD_MAX) { |
1053 | COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax); | |
dd2155a4 | 1054 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
809abb02 | 1055 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
b15aece3 | 1056 | (long)off, SvPVX_const(sv), |
809abb02 NC |
1057 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
1058 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
dd2155a4 DM |
1059 | ); |
1060 | } | |
1061 | } | |
1062 | PL_cop_seqmax++; | |
1063 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1064 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); | |
1065 | } | |
1066 | ||
1067 | ||
1068 | /* | |
1069 | =for apidoc pad_swipe | |
1070 | ||
1071 | Abandon the tmp in the current pad at offset po and replace with a | |
1072 | new one. | |
1073 | ||
1074 | =cut | |
1075 | */ | |
1076 | ||
1077 | void | |
1078 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1079 | { | |
97aff369 | 1080 | dVAR; |
f3548bdc | 1081 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 DM |
1082 | if (!PL_curpad) |
1083 | return; | |
1084 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1085 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); | |
1086 | if (!po) | |
1087 | Perl_croak(aTHX_ "panic: pad_swipe po"); | |
1088 | ||
1089 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1090 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", | |
1091 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
1092 | ||
1093 | if (PL_curpad[po]) | |
1094 | SvPADTMP_off(PL_curpad[po]); | |
1095 | if (refadjust) | |
1096 | SvREFCNT_dec(PL_curpad[po]); | |
1097 | ||
9ad9869c DM |
1098 | |
1099 | /* if pad tmps aren't shared between ops, then there's no need to | |
1100 | * create a new tmp when an existing op is freed */ | |
1101 | #ifdef USE_BROKEN_PAD_RESET | |
561b68a9 | 1102 | PL_curpad[po] = newSV(0); |
dd2155a4 | 1103 | SvPADTMP_on(PL_curpad[po]); |
9ad9869c DM |
1104 | #else |
1105 | PL_curpad[po] = &PL_sv_undef; | |
97bf4a8d | 1106 | #endif |
dd2155a4 DM |
1107 | if ((I32)po < PL_padix) |
1108 | PL_padix = po - 1; | |
1109 | } | |
1110 | ||
1111 | ||
1112 | /* | |
1113 | =for apidoc pad_reset | |
1114 | ||
1115 | Mark all the current temporaries for reuse | |
1116 | ||
1117 | =cut | |
1118 | */ | |
1119 | ||
1120 | /* XXX pad_reset() is currently disabled because it results in serious bugs. | |
1121 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed | |
1122 | * on the stack by OPs that use them, there are several ways to get an alias | |
1123 | * to a shared TARG. Such an alias will change randomly and unpredictably. | |
1124 | * We avoid doing this until we can think of a Better Way. | |
1125 | * GSAR 97-10-29 */ | |
1126 | void | |
1127 | Perl_pad_reset(pTHX) | |
1128 | { | |
97aff369 | 1129 | dVAR; |
dd2155a4 | 1130 | #ifdef USE_BROKEN_PAD_RESET |
dd2155a4 DM |
1131 | if (AvARRAY(PL_comppad) != PL_curpad) |
1132 | Perl_croak(aTHX_ "panic: pad_reset curpad"); | |
1133 | ||
1134 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1135 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", | |
1136 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1137 | (long)PL_padix, (long)PL_padix_floor | |
1138 | ) | |
1139 | ); | |
1140 | ||
1141 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ | |
e1ec3a88 | 1142 | register I32 po; |
dd2155a4 DM |
1143 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
1144 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) | |
1145 | SvPADTMP_off(PL_curpad[po]); | |
1146 | } | |
1147 | PL_padix = PL_padix_floor; | |
1148 | } | |
1149 | #endif | |
1150 | PL_pad_reset_pending = FALSE; | |
1151 | } | |
1152 | ||
1153 | ||
1154 | /* | |
1155 | =for apidoc pad_tidy | |
1156 | ||
1157 | Tidy up a pad after we've finished compiling it: | |
1158 | * remove most stuff from the pads of anonsub prototypes; | |
1159 | * give it a @_; | |
1160 | * mark tmps as such. | |
1161 | ||
1162 | =cut | |
1163 | */ | |
1164 | ||
1165 | /* XXX DAPM surely most of this stuff should be done properly | |
1166 | * at the right time beforehand, rather than going around afterwards | |
1167 | * cleaning up our mistakes ??? | |
1168 | */ | |
1169 | ||
1170 | void | |
1171 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1172 | { | |
27da23d5 | 1173 | dVAR; |
dd2155a4 | 1174 | |
f3548bdc | 1175 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 DM |
1176 | |
1177 | /* If this CV has had any 'eval-capable' ops planted in it | |
1178 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any | |
1179 | * anon prototypes in the chain of CVs should be marked as cloneable, | |
1180 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets | |
1181 | * the right CvOUTSIDE. | |
1182 | * If running with -d, *any* sub may potentially have an eval | |
1183 | * excuted within it. | |
1184 | */ | |
1185 | ||
1186 | if (PL_cv_has_eval || PL_perldb) { | |
e1ec3a88 | 1187 | const CV *cv; |
b5c19bd7 DM |
1188 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1189 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1190 | break; /* no need to mark already-compiled code */ | |
1191 | if (CvANON(cv)) { | |
1192 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1193 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); | |
1194 | CvCLONE_on(cv); | |
1195 | } | |
1196 | } | |
1197 | } | |
1198 | ||
dd2155a4 DM |
1199 | /* extend curpad to match namepad */ |
1200 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) | |
a0714e2c | 1201 | av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
dd2155a4 DM |
1202 | |
1203 | if (type == padtidy_SUBCLONE) { | |
551405c4 | 1204 | SV * const * const namep = AvARRAY(PL_comppad_name); |
504618e9 | 1205 | PADOFFSET ix; |
b5c19bd7 | 1206 | |
dd2155a4 DM |
1207 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1208 | SV *namesv; | |
1209 | ||
1210 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1211 | continue; | |
1212 | /* | |
1213 | * The only things that a clonable function needs in its | |
b5c19bd7 | 1214 | * pad are anonymous subs. |
dd2155a4 DM |
1215 | * The rest are created anew during cloning. |
1216 | */ | |
a0714e2c | 1217 | if (!((namesv = namep[ix]) != NULL && |
dd2155a4 | 1218 | namesv != &PL_sv_undef && |
b15aece3 | 1219 | *SvPVX_const(namesv) == '&')) |
dd2155a4 DM |
1220 | { |
1221 | SvREFCNT_dec(PL_curpad[ix]); | |
a0714e2c | 1222 | PL_curpad[ix] = NULL; |
dd2155a4 DM |
1223 | } |
1224 | } | |
1225 | } | |
1226 | else if (type == padtidy_SUB) { | |
1227 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ | |
53c1dcc0 | 1228 | AV * const av = newAV(); /* Will be @_ */ |
dd2155a4 DM |
1229 | av_extend(av, 0); |
1230 | av_store(PL_comppad, 0, (SV*)av); | |
11ca45c0 | 1231 | AvREIFY_only(av); |
dd2155a4 DM |
1232 | } |
1233 | ||
1234 | /* XXX DAPM rationalise these two similar branches */ | |
1235 | ||
1236 | if (type == padtidy_SUB) { | |
504618e9 | 1237 | PADOFFSET ix; |
dd2155a4 DM |
1238 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1239 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) | |
1240 | continue; | |
1241 | if (!SvPADMY(PL_curpad[ix])) | |
1242 | SvPADTMP_on(PL_curpad[ix]); | |
1243 | } | |
1244 | } | |
1245 | else if (type == padtidy_FORMAT) { | |
504618e9 | 1246 | PADOFFSET ix; |
dd2155a4 DM |
1247 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
1248 | if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) | |
1249 | SvPADTMP_on(PL_curpad[ix]); | |
1250 | } | |
1251 | } | |
f3548bdc | 1252 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1253 | } |
1254 | ||
1255 | ||
1256 | /* | |
1257 | =for apidoc pad_free | |
1258 | ||
8627550a | 1259 | Free the SV at offset po in the current pad. |
dd2155a4 DM |
1260 | |
1261 | =cut | |
1262 | */ | |
1263 | ||
1264 | /* XXX DAPM integrate with pad_swipe ???? */ | |
1265 | void | |
1266 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1267 | { | |
97aff369 | 1268 | dVAR; |
f3548bdc | 1269 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 DM |
1270 | if (!PL_curpad) |
1271 | return; | |
1272 | if (AvARRAY(PL_comppad) != PL_curpad) | |
1273 | Perl_croak(aTHX_ "panic: pad_free curpad"); | |
1274 | if (!po) | |
1275 | Perl_croak(aTHX_ "panic: pad_free po"); | |
1276 | ||
1277 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1278 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", | |
1279 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
1280 | ); | |
1281 | ||
1282 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { | |
1283 | SvPADTMP_off(PL_curpad[po]); | |
1284 | #ifdef USE_ITHREADS | |
7e736055 HS |
1285 | /* SV could be a shared hash key (eg bugid #19022) */ |
1286 | if ( | |
f8c7b90f | 1287 | #ifdef PERL_OLD_COPY_ON_WRITE |
7e736055 HS |
1288 | !SvIsCOW(PL_curpad[po]) |
1289 | #else | |
1290 | !SvFAKE(PL_curpad[po]) | |
dd2155a4 | 1291 | #endif |
7e736055 | 1292 | ) |
dd2155a4 | 1293 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
dd2155a4 DM |
1294 | #endif |
1295 | } | |
1296 | if ((I32)po < PL_padix) | |
1297 | PL_padix = po - 1; | |
1298 | } | |
1299 | ||
1300 | ||
1301 | ||
1302 | /* | |
1303 | =for apidoc do_dump_pad | |
1304 | ||
1305 | Dump the contents of a padlist | |
1306 | ||
1307 | =cut | |
1308 | */ | |
1309 | ||
1310 | void | |
1311 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1312 | { | |
97aff369 | 1313 | dVAR; |
e1ec3a88 AL |
1314 | const AV *pad_name; |
1315 | const AV *pad; | |
dd2155a4 DM |
1316 | SV **pname; |
1317 | SV **ppad; | |
dd2155a4 DM |
1318 | I32 ix; |
1319 | ||
1320 | if (!padlist) { | |
1321 | return; | |
1322 | } | |
1323 | pad_name = (AV*)*av_fetch((AV*)padlist, 0, FALSE); | |
1324 | pad = (AV*)*av_fetch((AV*)padlist, 1, FALSE); | |
1325 | pname = AvARRAY(pad_name); | |
1326 | ppad = AvARRAY(pad); | |
1327 | Perl_dump_indent(aTHX_ level, file, | |
1328 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", | |
1329 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
1330 | ); | |
1331 | ||
1332 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { | |
e1ec3a88 | 1333 | const SV *namesv = pname[ix]; |
dd2155a4 | 1334 | if (namesv && namesv == &PL_sv_undef) { |
a0714e2c | 1335 | namesv = NULL; |
dd2155a4 DM |
1336 | } |
1337 | if (namesv) { | |
ee6cee0c DM |
1338 | if (SvFAKE(namesv)) |
1339 | Perl_dump_indent(aTHX_ level+1, file, | |
c0fd1b42 | 1340 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
ee6cee0c DM |
1341 | (int) ix, |
1342 | PTR2UV(ppad[ix]), | |
1343 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
b15aece3 | 1344 | SvPVX_const(namesv), |
809abb02 NC |
1345 | (unsigned long)PARENT_FAKELEX_FLAGS(namesv), |
1346 | (unsigned long)PARENT_PAD_INDEX(namesv) | |
b5c19bd7 | 1347 | |
ee6cee0c DM |
1348 | ); |
1349 | else | |
1350 | Perl_dump_indent(aTHX_ level+1, file, | |
809abb02 | 1351 | "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n", |
ee6cee0c DM |
1352 | (int) ix, |
1353 | PTR2UV(ppad[ix]), | |
1354 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
809abb02 NC |
1355 | (unsigned long)COP_SEQ_RANGE_LOW(namesv), |
1356 | (unsigned long)COP_SEQ_RANGE_HIGH(namesv), | |
b15aece3 | 1357 | SvPVX_const(namesv) |
ee6cee0c | 1358 | ); |
dd2155a4 DM |
1359 | } |
1360 | else if (full) { | |
1361 | Perl_dump_indent(aTHX_ level+1, file, | |
1362 | "%2d. 0x%"UVxf"<%lu>\n", | |
1363 | (int) ix, | |
1364 | PTR2UV(ppad[ix]), | |
1365 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1366 | ); | |
1367 | } | |
1368 | } | |
1369 | } | |
1370 | ||
1371 | ||
1372 | ||
1373 | /* | |
1374 | =for apidoc cv_dump | |
1375 | ||
1376 | dump the contents of a CV | |
1377 | ||
1378 | =cut | |
1379 | */ | |
1380 | ||
1381 | #ifdef DEBUGGING | |
1382 | STATIC void | |
e1ec3a88 | 1383 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 | 1384 | { |
97aff369 | 1385 | dVAR; |
53c1dcc0 AL |
1386 | const CV * const outside = CvOUTSIDE(cv); |
1387 | AV* const padlist = CvPADLIST(cv); | |
dd2155a4 DM |
1388 | |
1389 | PerlIO_printf(Perl_debug_log, | |
1390 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", | |
1391 | title, | |
1392 | PTR2UV(cv), | |
1393 | (CvANON(cv) ? "ANON" | |
71f882da | 1394 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
dd2155a4 DM |
1395 | : (cv == PL_main_cv) ? "MAIN" |
1396 | : CvUNIQUE(cv) ? "UNIQUE" | |
1397 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1398 | PTR2UV(outside), | |
1399 | (!outside ? "null" | |
1400 | : CvANON(outside) ? "ANON" | |
1401 | : (outside == PL_main_cv) ? "MAIN" | |
1402 | : CvUNIQUE(outside) ? "UNIQUE" | |
1403 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
1404 | ||
1405 | PerlIO_printf(Perl_debug_log, | |
1406 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); | |
1407 | do_dump_pad(1, Perl_debug_log, padlist, 1); | |
1408 | } | |
1409 | #endif /* DEBUGGING */ | |
1410 | ||
1411 | ||
1412 | ||
1413 | ||
1414 | ||
1415 | /* | |
1416 | =for apidoc cv_clone | |
1417 | ||
1418 | Clone a CV: make a new CV which points to the same code etc, but which | |
1419 | has a newly-created pad built by copying the prototype pad and capturing | |
1420 | any outer lexicals. | |
1421 | ||
1422 | =cut | |
1423 | */ | |
1424 | ||
1425 | CV * | |
1426 | Perl_cv_clone(pTHX_ CV *proto) | |
1427 | { | |
27da23d5 | 1428 | dVAR; |
dd2155a4 | 1429 | I32 ix; |
53c1dcc0 AL |
1430 | AV* const protopadlist = CvPADLIST(proto); |
1431 | const AV* const protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); | |
1432 | const AV* const protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); | |
1433 | SV** const pname = AvARRAY(protopad_name); | |
1434 | SV** const ppad = AvARRAY(protopad); | |
e1ec3a88 AL |
1435 | const I32 fname = AvFILLp(protopad_name); |
1436 | const I32 fpad = AvFILLp(protopad); | |
dd2155a4 | 1437 | CV* cv; |
b5c19bd7 DM |
1438 | SV** outpad; |
1439 | CV* outside; | |
71f882da | 1440 | long depth; |
dd2155a4 DM |
1441 | |
1442 | assert(!CvUNIQUE(proto)); | |
1443 | ||
71f882da DM |
1444 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
1445 | * to a prototype; we instead want the cloned parent who called us. | |
1446 | * Note that in general for formats, CvOUTSIDE != find_runcv */ | |
1447 | ||
1448 | outside = CvOUTSIDE(proto); | |
1449 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) | |
1450 | outside = find_runcv(NULL); | |
1451 | depth = CvDEPTH(outside); | |
1452 | assert(depth || SvTYPE(proto) == SVt_PVFM); | |
1453 | if (!depth) | |
1454 | depth = 1; | |
b5c19bd7 DM |
1455 | assert(CvPADLIST(outside)); |
1456 | ||
dd2155a4 DM |
1457 | ENTER; |
1458 | SAVESPTR(PL_compcv); | |
1459 | ||
561b68a9 | 1460 | cv = PL_compcv = (CV*)newSV(0); |
dd2155a4 | 1461 | sv_upgrade((SV *)cv, SvTYPE(proto)); |
7dafbf52 | 1462 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
dd2155a4 DM |
1463 | CvCLONED_on(cv); |
1464 | ||
dd2155a4 | 1465 | #ifdef USE_ITHREADS |
aed2304a NC |
1466 | CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto) |
1467 | : savepv(CvFILE(proto)); | |
dd2155a4 DM |
1468 | #else |
1469 | CvFILE(cv) = CvFILE(proto); | |
1470 | #endif | |
1471 | CvGV(cv) = CvGV(proto); | |
1472 | CvSTASH(cv) = CvSTASH(proto); | |
b34c0dd4 | 1473 | OP_REFCNT_LOCK; |
dd2155a4 | 1474 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
b34c0dd4 | 1475 | OP_REFCNT_UNLOCK; |
dd2155a4 | 1476 | CvSTART(cv) = CvSTART(proto); |
b37c2d43 | 1477 | CvOUTSIDE(cv) = (CV*)SvREFCNT_inc_simple(outside); |
b5c19bd7 | 1478 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
dd2155a4 DM |
1479 | |
1480 | if (SvPOK(proto)) | |
b15aece3 | 1481 | sv_setpvn((SV*)cv, SvPVX_const(proto), SvCUR(proto)); |
dd2155a4 | 1482 | |
b7787f18 | 1483 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
dd2155a4 | 1484 | |
b5c19bd7 | 1485 | av_fill(PL_comppad, fpad); |
dd2155a4 DM |
1486 | for (ix = fname; ix >= 0; ix--) |
1487 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); | |
1488 | ||
dd2155a4 DM |
1489 | PL_curpad = AvARRAY(PL_comppad); |
1490 | ||
71f882da | 1491 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
b5c19bd7 | 1492 | |
dd2155a4 | 1493 | for (ix = fpad; ix > 0; ix--) { |
a0714e2c SS |
1494 | SV* const namesv = (ix <= fname) ? pname[ix] : NULL; |
1495 | SV *sv = NULL; | |
71f882da | 1496 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
b5c19bd7 | 1497 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
809abb02 | 1498 | sv = outpad[PARENT_PAD_INDEX(namesv)]; |
71f882da DM |
1499 | assert(sv); |
1500 | /* formats may have an inactive parent */ | |
1501 | if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { | |
1502 | if (ckWARN(WARN_CLOSURE)) | |
1503 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
b15aece3 | 1504 | "Variable \"%s\" is not available", SvPVX_const(namesv)); |
a0714e2c | 1505 | sv = NULL; |
71f882da DM |
1506 | } |
1507 | else { | |
1508 | assert(!SvPADSTALE(sv)); | |
f84c484e | 1509 | SvREFCNT_inc_simple_void_NN(sv); |
71f882da | 1510 | } |
dd2155a4 | 1511 | } |
71f882da | 1512 | if (!sv) { |
b15aece3 | 1513 | const char sigil = SvPVX_const(namesv)[0]; |
e1ec3a88 | 1514 | if (sigil == '&') |
dd2155a4 | 1515 | sv = SvREFCNT_inc(ppad[ix]); |
e1ec3a88 | 1516 | else if (sigil == '@') |
dd2155a4 | 1517 | sv = (SV*)newAV(); |
e1ec3a88 | 1518 | else if (sigil == '%') |
dd2155a4 DM |
1519 | sv = (SV*)newHV(); |
1520 | else | |
561b68a9 | 1521 | sv = newSV(0); |
235cc2e3 | 1522 | SvPADMY_on(sv); |
dd2155a4 DM |
1523 | } |
1524 | } | |
1525 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { | |
f84c484e | 1526 | sv = SvREFCNT_inc_NN(ppad[ix]); |
dd2155a4 DM |
1527 | } |
1528 | else { | |
561b68a9 | 1529 | sv = newSV(0); |
dd2155a4 | 1530 | SvPADTMP_on(sv); |
dd2155a4 | 1531 | } |
71f882da | 1532 | PL_curpad[ix] = sv; |
dd2155a4 DM |
1533 | } |
1534 | ||
dd2155a4 DM |
1535 | DEBUG_Xv( |
1536 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); | |
1537 | cv_dump(outside, "Outside"); | |
1538 | cv_dump(proto, "Proto"); | |
1539 | cv_dump(cv, "To"); | |
1540 | ); | |
1541 | ||
1542 | LEAVE; | |
1543 | ||
1544 | if (CvCONST(cv)) { | |
b5c19bd7 DM |
1545 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
1546 | * The prototype was marked as a candiate for const-ization, | |
1547 | * so try to grab the current const value, and if successful, | |
1548 | * turn into a const sub: | |
1549 | */ | |
551405c4 | 1550 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
b5c19bd7 DM |
1551 | if (const_sv) { |
1552 | SvREFCNT_dec(cv); | |
bd61b366 | 1553 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); |
b5c19bd7 DM |
1554 | } |
1555 | else { | |
1556 | CvCONST_off(cv); | |
1557 | } | |
dd2155a4 DM |
1558 | } |
1559 | ||
1560 | return cv; | |
1561 | } | |
1562 | ||
1563 | ||
1564 | /* | |
1565 | =for apidoc pad_fixup_inner_anons | |
1566 | ||
1567 | For any anon CVs in the pad, change CvOUTSIDE of that CV from | |
7dafbf52 DM |
1568 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
1569 | moved to a pre-existing CV struct. | |
dd2155a4 DM |
1570 | |
1571 | =cut | |
1572 | */ | |
1573 | ||
1574 | void | |
1575 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
1576 | { | |
97aff369 | 1577 | dVAR; |
dd2155a4 | 1578 | I32 ix; |
66a1b24b AL |
1579 | AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; |
1580 | AV * const comppad = (AV*)AvARRAY(padlist)[1]; | |
53c1dcc0 AL |
1581 | SV ** const namepad = AvARRAY(comppad_name); |
1582 | SV ** const curpad = AvARRAY(comppad); | |
294a48e9 AL |
1583 | PERL_UNUSED_ARG(old_cv); |
1584 | ||
dd2155a4 | 1585 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
551405c4 | 1586 | const SV * const namesv = namepad[ix]; |
dd2155a4 | 1587 | if (namesv && namesv != &PL_sv_undef |
b15aece3 | 1588 | && *SvPVX_const(namesv) == '&') |
dd2155a4 | 1589 | { |
46c461b5 | 1590 | CV * const innercv = (CV*)curpad[ix]; |
7dafbf52 DM |
1591 | assert(CvWEAKOUTSIDE(innercv)); |
1592 | assert(CvOUTSIDE(innercv) == old_cv); | |
1593 | CvOUTSIDE(innercv) = new_cv; | |
dd2155a4 DM |
1594 | } |
1595 | } | |
1596 | } | |
1597 | ||
7dafbf52 | 1598 | |
dd2155a4 DM |
1599 | /* |
1600 | =for apidoc pad_push | |
1601 | ||
1602 | Push a new pad frame onto the padlist, unless there's already a pad at | |
26019298 AL |
1603 | this depth, in which case don't bother creating a new one. Then give |
1604 | the new pad an @_ in slot zero. | |
dd2155a4 DM |
1605 | |
1606 | =cut | |
1607 | */ | |
1608 | ||
1609 | void | |
26019298 | 1610 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 | 1611 | { |
97aff369 | 1612 | dVAR; |
b37c2d43 | 1613 | if (depth > AvFILLp(padlist)) { |
44f8325f AL |
1614 | SV** const svp = AvARRAY(padlist); |
1615 | AV* const newpad = newAV(); | |
1616 | SV** const oldpad = AvARRAY(svp[depth-1]); | |
dd2155a4 | 1617 | I32 ix = AvFILLp((AV*)svp[1]); |
e1ec3a88 | 1618 | const I32 names_fill = AvFILLp((AV*)svp[0]); |
44f8325f | 1619 | SV** const names = AvARRAY(svp[0]); |
26019298 AL |
1620 | AV *av; |
1621 | ||
dd2155a4 DM |
1622 | for ( ;ix > 0; ix--) { |
1623 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { | |
b15aece3 | 1624 | const char sigil = SvPVX_const(names[ix])[0]; |
26019298 | 1625 | if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') { |
dd2155a4 DM |
1626 | /* outer lexical or anon code */ |
1627 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); | |
1628 | } | |
1629 | else { /* our own lexical */ | |
26019298 AL |
1630 | SV *sv; |
1631 | if (sigil == '@') | |
1632 | sv = (SV*)newAV(); | |
1633 | else if (sigil == '%') | |
1634 | sv = (SV*)newHV(); | |
dd2155a4 | 1635 | else |
561b68a9 | 1636 | sv = newSV(0); |
26019298 | 1637 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1638 | SvPADMY_on(sv); |
1639 | } | |
1640 | } | |
1641 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { | |
f84c484e | 1642 | av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix])); |
dd2155a4 DM |
1643 | } |
1644 | else { | |
1645 | /* save temporaries on recursion? */ | |
561b68a9 | 1646 | SV * const sv = newSV(0); |
26019298 | 1647 | av_store(newpad, ix, sv); |
dd2155a4 DM |
1648 | SvPADTMP_on(sv); |
1649 | } | |
1650 | } | |
26019298 AL |
1651 | av = newAV(); |
1652 | av_extend(av, 0); | |
1653 | av_store(newpad, 0, (SV*)av); | |
11ca45c0 | 1654 | AvREIFY_only(av); |
26019298 | 1655 | |
dd2155a4 DM |
1656 | av_store(padlist, depth, (SV*)newpad); |
1657 | AvFILLp(padlist) = depth; | |
1658 | } | |
1659 | } | |
b21dc031 AL |
1660 | |
1661 | ||
1662 | HV * | |
1663 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) | |
1664 | { | |
97aff369 | 1665 | dVAR; |
551405c4 | 1666 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
00b1698f | 1667 | if ( SvPAD_TYPED(*av) ) { |
b21dc031 AL |
1668 | return SvSTASH(*av); |
1669 | } | |
5c284bb0 | 1670 | return NULL; |
b21dc031 | 1671 | } |
66610fdd RGS |
1672 | |
1673 | /* | |
1674 | * Local variables: | |
1675 | * c-indentation-style: bsd | |
1676 | * c-basic-offset: 4 | |
1677 | * indent-tabs-mode: t | |
1678 | * End: | |
1679 | * | |
37442d52 RGS |
1680 | * ex: set ts=8 sts=4 sw=4 noet: |
1681 | */ |