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dd2155a4 DM |
1 | /* pad.c |
2 | * | |
1129b882 NC |
3 | * Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
4 | * by Larry Wall and others | |
dd2155a4 DM |
5 | * |
6 | * You may distribute under the terms of either the GNU General Public | |
7 | * License or the Artistic License, as specified in the README file. | |
4ac71550 TC |
8 | */ |
9 | ||
10 | /* | |
11 | * 'Anyway: there was this Mr. Frodo left an orphan and stranded, as you | |
12 | * might say, among those queer Bucklanders, being brought up anyhow in | |
13 | * Brandy Hall. A regular warren, by all accounts. Old Master Gorbadoc | |
14 | * never had fewer than a couple of hundred relations in the place. | |
15 | * Mr. Bilbo never did a kinder deed than when he brought the lad back | |
16 | * to live among decent folk.' --the Gaffer | |
dd2155a4 | 17 | * |
4ac71550 | 18 | * [p.23 of _The Lord of the Rings_, I/i: "A Long-Expected Party"] |
dd2155a4 DM |
19 | */ |
20 | ||
dd2155a4 | 21 | /* |
3f620621 | 22 | =for apidoc_section $pad |
dd2155a4 | 23 | |
cc76b5cc | 24 | =for apidoc Amx|PADLIST *|CvPADLIST|CV *cv |
166f8a29 | 25 | |
58a9b2fe | 26 | CV's can have CvPADLIST(cv) set to point to a PADLIST. This is the CV's |
cc76b5cc Z |
27 | scratchpad, which stores lexical variables and opcode temporary and |
28 | per-thread values. | |
dd2155a4 | 29 | |
58a9b2fe | 30 | For these purposes "formats" are a kind-of CV; eval""s are too (except they're |
dd2155a4 | 31 | not callable at will and are always thrown away after the eval"" is done |
58a9b2fe | 32 | executing). Require'd files are simply evals without any outer lexical |
b5c19bd7 | 33 | scope. |
dd2155a4 | 34 | |
796b6530 | 35 | XSUBs do not have a C<CvPADLIST>. C<dXSTARG> fetches values from C<PL_curpad>, |
dd2155a4 | 36 | but that is really the callers pad (a slot of which is allocated by |
796b6530 KW |
37 | every entersub). Do not get or set C<CvPADLIST> if a CV is an XSUB (as |
38 | determined by C<CvISXSUB()>), C<CvPADLIST> slot is reused for a different | |
eacbb379 | 39 | internal purpose in XSUBs. |
dd2155a4 | 40 | |
58a9b2fe | 41 | The PADLIST has a C array where pads are stored. |
dd2155a4 | 42 | |
9b7476d7 FC |
43 | The 0th entry of the PADLIST is a PADNAMELIST |
44 | which represents the "names" or rather | |
58a9b2fe | 45 | the "static type information" for lexicals. The individual elements of a |
9b7476d7 | 46 | PADNAMELIST are PADNAMEs. Future |
7a5eb04d | 47 | refactorings might stop the PADNAMELIST from being stored in the PADLIST's |
86d2498c | 48 | array, so don't rely on it. See L</PadlistNAMES>. |
dd2155a4 | 49 | |
58a9b2fe FC |
50 | The CvDEPTH'th entry of a PADLIST is a PAD (an AV) which is the stack frame |
51 | at that depth of recursion into the CV. The 0th slot of a frame AV is an | |
796b6530 | 52 | AV which is C<@_>. Other entries are storage for variables and op targets. |
dd2155a4 | 53 | |
58a9b2fe | 54 | Iterating over the PADNAMELIST iterates over all possible pad |
796b6530 | 55 | items. Pad slots for targets (C<SVs_PADTMP>) |
307a54be | 56 | and GVs end up having &PL_padname_undef "names", while slots for constants |
796b6530 KW |
57 | have C<&PL_padname_const> "names" (see C<L</pad_alloc>>). That |
58 | C<&PL_padname_undef> | |
59 | and C<&PL_padname_const> are used is an implementation detail subject to | |
60 | change. To test for them, use C<!PadnamePV(name)> and | |
61b16eb9 | 61 | S<C<PadnamePV(name) && !PadnameLEN(name)>>, respectively. |
dd2155a4 | 62 | |
796b6530 | 63 | Only C<my>/C<our> variable slots get valid names. |
dd2155a4 DM |
64 | The rest are op targets/GVs/constants which are statically allocated |
65 | or resolved at compile time. These don't have names by which they | |
58a9b2fe | 66 | can be looked up from Perl code at run time through eval"" the way |
796b6530 | 67 | C<my>/C<our> variables can be. Since they can't be looked up by "name" |
dd2155a4 | 68 | but only by their index allocated at compile time (which is usually |
fefd4795 | 69 | in C<< PL_op->op_targ >>), wasting a name SV for them doesn't make sense. |
dd2155a4 | 70 | |
307a54be | 71 | The pad names in the PADNAMELIST have their PV holding the name of |
796b6530 | 72 | the variable. The C<COP_SEQ_RANGE_LOW> and C<_HIGH> fields form a range |
307a54be FC |
73 | (low+1..high inclusive) of cop_seq numbers for which the name is |
74 | valid. During compilation, these fields may hold the special value | |
61f4bfbf | 75 | PERL_PADSEQ_INTRO to indicate various stages: |
0d311cdb | 76 | |
8560fbdd KW |
77 | COP_SEQ_RANGE_LOW _HIGH |
78 | ----------------- ----- | |
79 | PERL_PADSEQ_INTRO 0 variable not yet introduced: | |
80 | { my ($x | |
81 | valid-seq# PERL_PADSEQ_INTRO variable in scope: | |
4e785f27 | 82 | { my ($x); |
8560fbdd | 83 | valid-seq# valid-seq# compilation of scope complete: |
4e785f27 DM |
84 | { my ($x); .... } |
85 | ||
86 | When a lexical var hasn't yet been introduced, it already exists from the | |
87 | perspective of duplicate declarations, but not for variable lookups, e.g. | |
88 | ||
89 | my ($x, $x); # '"my" variable $x masks earlier declaration' | |
90 | my $x = $x; # equal to my $x = $::x; | |
0d311cdb | 91 | |
796b6530 KW |
92 | For typed lexicals C<PadnameTYPE> points at the type stash. For C<our> |
93 | lexicals, C<PadnameOURSTASH> points at the stash of the associated global (so | |
307a54be | 94 | that duplicate C<our> declarations in the same package can be detected). |
796b6530 | 95 | C<PadnameGEN> is sometimes used to store the generation number during |
307a54be FC |
96 | compilation. |
97 | ||
796b6530 | 98 | If C<PadnameOUTER> is set on the pad name, then that slot in the frame AV |
307a54be FC |
99 | is a REFCNT'ed reference to a lexical from "outside". Such entries |
100 | are sometimes referred to as 'fake'. In this case, the name does not | |
101 | use 'low' and 'high' to store a cop_seq range, since it is in scope | |
102 | throughout. Instead 'high' stores some flags containing info about | |
b5c19bd7 | 103 | the real lexical (is it declared in an anon, and is it capable of being |
307a54be | 104 | instantiated multiple times?), and for fake ANONs, 'low' contains the index |
b5c19bd7 DM |
105 | within the parent's pad where the lexical's value is stored, to make |
106 | cloning quicker. | |
dd2155a4 | 107 | |
796b6530 | 108 | If the 'name' is C<&> the corresponding entry in the PAD |
dd2155a4 | 109 | is a CV representing a possible closure. |
dd2155a4 | 110 | |
71f882da DM |
111 | Note that formats are treated as anon subs, and are cloned each time |
112 | write is called (if necessary). | |
113 | ||
796b6530 | 114 | The flag C<SVs_PADSTALE> is cleared on lexicals each time the C<my()> is executed, |
58a9b2fe | 115 | and set on scope exit. This allows the |
796b6530 | 116 | C<"Variable $x is not available"> warning |
e6e7068b DM |
117 | to be generated in evals, such as |
118 | ||
119 | { my $x = 1; sub f { eval '$x'} } f(); | |
120 | ||
796b6530 | 121 | For state vars, C<SVs_PADSTALE> is overloaded to mean 'not yet initialised', |
c9956dca | 122 | but this internal state is stored in a separate pad entry. |
d1186544 | 123 | |
5af38e47 KW |
124 | =for apidoc Amnh||SVs_PADSTALE |
125 | ||
78342678 | 126 | =for apidoc AmnxU|PADNAMELIST *|PL_comppad_name |
cc76b5cc Z |
127 | |
128 | During compilation, this points to the array containing the names part | |
129 | of the pad for the currently-compiling code. | |
130 | ||
78342678 | 131 | =for apidoc AmnxU|PAD *|PL_comppad |
cc76b5cc Z |
132 | |
133 | During compilation, this points to the array containing the values | |
134 | part of the pad for the currently-compiling code. (At runtime a CV may | |
135 | have many such value arrays; at compile time just one is constructed.) | |
136 | At runtime, this points to the array containing the currently-relevant | |
137 | values for the pad for the currently-executing code. | |
138 | ||
78342678 | 139 | =for apidoc AmnxU|SV **|PL_curpad |
cc76b5cc Z |
140 | |
141 | Points directly to the body of the L</PL_comppad> array. | |
efa4252e | 142 | (I.e., this is C<PadARRAY(PL_comppad)>.) |
cc76b5cc | 143 | |
dd2155a4 DM |
144 | =cut |
145 | */ | |
146 | ||
147 | ||
148 | #include "EXTERN.h" | |
149 | #define PERL_IN_PAD_C | |
150 | #include "perl.h" | |
952306ac | 151 | #include "keywords.h" |
dd2155a4 | 152 | |
3441fb63 | 153 | #define COP_SEQ_RANGE_LOW_set(sv,val) \ |
0f94cb1f | 154 | STMT_START { (sv)->xpadn_low = (val); } STMT_END |
3441fb63 | 155 | #define COP_SEQ_RANGE_HIGH_set(sv,val) \ |
0f94cb1f | 156 | STMT_START { (sv)->xpadn_high = (val); } STMT_END |
809abb02 | 157 | |
0f94cb1f FC |
158 | #define PARENT_PAD_INDEX_set COP_SEQ_RANGE_LOW_set |
159 | #define PARENT_FAKELEX_FLAGS_set COP_SEQ_RANGE_HIGH_set | |
dd2155a4 | 160 | |
eacbb379 DD |
161 | #ifdef DEBUGGING |
162 | void | |
e69651e7 | 163 | Perl_set_padlist(CV * cv, PADLIST *padlist){ |
eacbb379 DD |
164 | PERL_ARGS_ASSERT_SET_PADLIST; |
165 | # if PTRSIZE == 8 | |
e5964223 | 166 | assert((Size_t)padlist != UINT64_C(0xEFEFEFEFEFEFEFEF)); |
eacbb379 | 167 | # elif PTRSIZE == 4 |
a1c99363 | 168 | assert((Size_t)padlist != 0xEFEFEFEF); |
eacbb379 DD |
169 | # else |
170 | # error unknown pointer size | |
171 | # endif | |
e5964223 | 172 | assert(!CvISXSUB(cv)); |
eacbb379 DD |
173 | ((XPVCV*)MUTABLE_PTR(SvANY(cv)))->xcv_padlist_u.xcv_padlist = padlist; |
174 | } | |
175 | #endif | |
5b16296c BF |
176 | |
177 | /* | |
44170c9a | 178 | =for apidoc pad_new |
dd2155a4 | 179 | |
cc76b5cc Z |
180 | Create a new padlist, updating the global variables for the |
181 | currently-compiling padlist to point to the new padlist. The following | |
182 | flags can be OR'ed together: | |
dd2155a4 DM |
183 | |
184 | padnew_CLONE this pad is for a cloned CV | |
cc76b5cc | 185 | padnew_SAVE save old globals on the save stack |
dd2155a4 DM |
186 | padnew_SAVESUB also save extra stuff for start of sub |
187 | ||
188 | =cut | |
189 | */ | |
190 | ||
191 | PADLIST * | |
c7c737cb | 192 | Perl_pad_new(pTHX_ int flags) |
dd2155a4 | 193 | { |
7261499d | 194 | PADLIST *padlist; |
9b7476d7 FC |
195 | PADNAMELIST *padname; |
196 | PAD *pad; | |
7261499d | 197 | PAD **ary; |
dd2155a4 | 198 | |
f3548bdc DM |
199 | ASSERT_CURPAD_LEGAL("pad_new"); |
200 | ||
dd2155a4 DM |
201 | /* save existing state, ... */ |
202 | ||
203 | if (flags & padnew_SAVE) { | |
1604cfb0 MS |
204 | SAVECOMPPAD(); |
205 | if (! (flags & padnew_CLONE)) { | |
206 | SAVESPTR(PL_comppad_name); | |
58541fd0 PE |
207 | SAVESTRLEN(PL_padix); |
208 | SAVESTRLEN(PL_constpadix); | |
209 | SAVESTRLEN(PL_comppad_name_fill); | |
210 | SAVESTRLEN(PL_min_intro_pending); | |
211 | SAVESTRLEN(PL_max_intro_pending); | |
1604cfb0 MS |
212 | SAVEBOOL(PL_cv_has_eval); |
213 | if (flags & padnew_SAVESUB) { | |
214 | SAVEBOOL(PL_pad_reset_pending); | |
215 | } | |
216 | } | |
dd2155a4 | 217 | } |
dd2155a4 DM |
218 | |
219 | /* ... create new pad ... */ | |
220 | ||
7261499d | 221 | Newxz(padlist, 1, PADLIST); |
dd2155a4 | 222 | pad = newAV(); |
36f923e5 RL |
223 | Newxz(AvALLOC(pad), 4, SV *); /* Originally sized to |
224 | match av_extend default */ | |
225 | AvARRAY(pad) = AvALLOC(pad); | |
226 | AvMAX(pad) = 3; | |
227 | AvFILLp(pad) = 0; /* @_ or NULL, set below. */ | |
dd2155a4 DM |
228 | |
229 | if (flags & padnew_CLONE) { | |
e1ec3a88 | 230 | AV * const a0 = newAV(); /* will be @_ */ |
36f923e5 | 231 | AvARRAY(pad)[0] = MUTABLE_SV(a0); |
1604cfb0 | 232 | AvREIFY_only(a0); |
9ef8d569 | 233 | |
1604cfb0 | 234 | PadnamelistREFCNT(padname = PL_comppad_name)++; |
dd2155a4 DM |
235 | } |
236 | else { | |
1604cfb0 | 237 | padlist->xpadl_id = PL_padlist_generation++; |
36f923e5 RL |
238 | /* Set implicitly through use of Newxz above |
239 | AvARRAY(pad)[0] = NULL; | |
240 | */ | |
1604cfb0 MS |
241 | padname = newPADNAMELIST(0); |
242 | padnamelist_store(padname, 0, &PL_padname_undef); | |
dd2155a4 DM |
243 | } |
244 | ||
7a6072a8 NC |
245 | /* Most subroutines never recurse, hence only need 2 entries in the padlist |
246 | array - names, and depth=1. The default for av_store() is to allocate | |
247 | 0..3, and even an explicit call to av_extend() with <3 will be rounded | |
248 | up, so we inline the allocation of the array here. */ | |
7261499d | 249 | Newx(ary, 2, PAD *); |
86d2498c FC |
250 | PadlistMAX(padlist) = 1; |
251 | PadlistARRAY(padlist) = ary; | |
9b7476d7 | 252 | ary[0] = (PAD *)padname; |
7261499d | 253 | ary[1] = pad; |
dd2155a4 DM |
254 | |
255 | /* ... then update state variables */ | |
256 | ||
403799bf NC |
257 | PL_comppad = pad; |
258 | PL_curpad = AvARRAY(pad); | |
dd2155a4 DM |
259 | |
260 | if (! (flags & padnew_CLONE)) { | |
1604cfb0 MS |
261 | PL_comppad_name = padname; |
262 | PL_comppad_name_fill = 0; | |
263 | PL_min_intro_pending = 0; | |
264 | PL_padix = 0; | |
265 | PL_constpadix = 0; | |
266 | PL_cv_has_eval = 0; | |
dd2155a4 DM |
267 | } |
268 | ||
269 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1604cfb0 MS |
270 | "Pad 0x%" UVxf "[0x%" UVxf "] new: compcv=0x%" UVxf |
271 | " name=0x%" UVxf " flags=0x%" UVxf "\n", | |
272 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), | |
273 | PTR2UV(padname), (UV)flags | |
274 | ) | |
dd2155a4 DM |
275 | ); |
276 | ||
277 | return (PADLIST*)padlist; | |
278 | } | |
279 | ||
dd2155a4 | 280 | |
c4528262 | 281 | /* |
3f620621 | 282 | =for apidoc_section $embedding |
c4528262 NC |
283 | |
284 | =for apidoc cv_undef | |
285 | ||
72d33970 | 286 | Clear out all the active components of a CV. This can happen either |
c4528262 | 287 | by an explicit C<undef &foo>, or by the reference count going to zero. |
796b6530 | 288 | In the former case, we keep the C<CvOUTSIDE> pointer, so that any anonymous |
c4528262 NC |
289 | children can still follow the full lexical scope chain. |
290 | ||
291 | =cut | |
292 | */ | |
293 | ||
294 | void | |
295 | Perl_cv_undef(pTHX_ CV *cv) | |
296 | { | |
b7acb0a3 FC |
297 | PERL_ARGS_ASSERT_CV_UNDEF; |
298 | cv_undef_flags(cv, 0); | |
299 | } | |
300 | ||
301 | void | |
302 | Perl_cv_undef_flags(pTHX_ CV *cv, U32 flags) | |
303 | { | |
52ec28d5 DD |
304 | CV cvbody;/*CV body will never be realloced inside this func, |
305 | so dont read it more than once, use fake CV so existing macros | |
306 | will work, the indirection and CV head struct optimized away*/ | |
307 | SvANY(&cvbody) = SvANY(cv); | |
c4528262 | 308 | |
b7acb0a3 | 309 | PERL_ARGS_ASSERT_CV_UNDEF_FLAGS; |
c4528262 NC |
310 | |
311 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1604cfb0 MS |
312 | "CV undef: cv=0x%" UVxf " comppad=0x%" UVxf "\n", |
313 | PTR2UV(cv), PTR2UV(PL_comppad)) | |
c4528262 NC |
314 | ); |
315 | ||
52ec28d5 | 316 | if (CvFILE(&cvbody)) { |
1604cfb0 MS |
317 | char * file = CvFILE(&cvbody); |
318 | CvFILE(&cvbody) = NULL; | |
319 | if(CvDYNFILE(&cvbody)) | |
320 | Safefree(file); | |
c4528262 | 321 | } |
dd2155a4 | 322 | |
52ec28d5 DD |
323 | /* CvSLABBED_off(&cvbody); *//* turned off below */ |
324 | /* release the sub's body */ | |
325 | if (!CvISXSUB(&cvbody)) { | |
326 | if(CvROOT(&cvbody)) { | |
327 | assert(SvTYPE(cv) == SVt_PVCV || SvTYPE(cv) == SVt_PVFM); /*unsafe is safe */ | |
328 | if (CvDEPTHunsafe(&cvbody)) { | |
329 | assert(SvTYPE(cv) == SVt_PVCV); | |
330 | Perl_croak_nocontext("Can't undef active subroutine"); | |
331 | } | |
332 | ENTER; | |
333 | ||
334 | PAD_SAVE_SETNULLPAD(); | |
335 | ||
336 | if (CvSLABBED(&cvbody)) OpslabREFCNT_dec_padok(OpSLAB(CvROOT(&cvbody))); | |
337 | op_free(CvROOT(&cvbody)); | |
338 | CvROOT(&cvbody) = NULL; | |
339 | CvSTART(&cvbody) = NULL; | |
340 | LEAVE; | |
341 | } | |
1604cfb0 | 342 | else if (CvSLABBED(&cvbody)) { |
52ec28d5 DD |
343 | if( CvSTART(&cvbody)) { |
344 | ENTER; | |
345 | PAD_SAVE_SETNULLPAD(); | |
346 | ||
347 | /* discard any leaked ops */ | |
348 | if (PL_parser) | |
349 | parser_free_nexttoke_ops(PL_parser, (OPSLAB *)CvSTART(&cvbody)); | |
350 | opslab_force_free((OPSLAB *)CvSTART(&cvbody)); | |
351 | CvSTART(&cvbody) = NULL; | |
352 | ||
353 | LEAVE; | |
354 | } | |
7aef8e5b | 355 | #ifdef DEBUGGING |
52ec28d5 | 356 | else Perl_warn(aTHX_ "Slab leaked from cv %p", (void*)cv); |
8be227ab | 357 | #endif |
52ec28d5 DD |
358 | } |
359 | } | |
360 | else { /* dont bother checking if CvXSUB(cv) is true, less branching */ | |
1604cfb0 | 361 | CvXSUB(&cvbody) = NULL; |
52ec28d5 | 362 | } |
c4528262 | 363 | SvPOK_off(MUTABLE_SV(cv)); /* forget prototype */ |
2f14e398 | 364 | sv_unmagic((SV *)cv, PERL_MAGIC_checkcall); |
b7acb0a3 | 365 | if (!(flags & CV_UNDEF_KEEP_NAME)) { |
1604cfb0 MS |
366 | if (CvNAMED(&cvbody)) { |
367 | CvNAME_HEK_set(&cvbody, NULL); | |
368 | CvNAMED_off(&cvbody); | |
369 | } | |
370 | else CvGV_set(cv, NULL); | |
b7acb0a3 | 371 | } |
c4528262 | 372 | |
c2736fce NC |
373 | /* This statement and the subsequence if block was pad_undef(). */ |
374 | pad_peg("pad_undef"); | |
375 | ||
eacbb379 | 376 | if (!CvISXSUB(&cvbody) && CvPADLIST(&cvbody)) { |
1604cfb0 MS |
377 | PADOFFSET ix; |
378 | const PADLIST *padlist = CvPADLIST(&cvbody); | |
379 | ||
380 | /* Free the padlist associated with a CV. | |
381 | If parts of it happen to be current, we null the relevant PL_*pad* | |
382 | global vars so that we don't have any dangling references left. | |
383 | We also repoint the CvOUTSIDE of any about-to-be-orphaned inner | |
384 | subs to the outer of this cv. */ | |
385 | ||
386 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
387 | "Pad undef: cv=0x%" UVxf " padlist=0x%" UVxf " comppad=0x%" UVxf "\n", | |
388 | PTR2UV(cv), PTR2UV(padlist), PTR2UV(PL_comppad)) | |
389 | ); | |
390 | ||
391 | /* detach any '&' anon children in the pad; if afterwards they | |
392 | * are still live, fix up their CvOUTSIDEs to point to our outside, | |
393 | * bypassing us. */ | |
394 | ||
395 | if (PL_phase != PERL_PHASE_DESTRUCT) { /* don't bother during global destruction */ | |
396 | CV * const outercv = CvOUTSIDE(&cvbody); | |
397 | const U32 seq = CvOUTSIDE_SEQ(&cvbody); | |
398 | PADNAMELIST * const comppad_name = PadlistNAMES(padlist); | |
399 | PADNAME ** const namepad = PadnamelistARRAY(comppad_name); | |
400 | PAD * const comppad = PadlistARRAY(padlist)[1]; | |
401 | SV ** const curpad = AvARRAY(comppad); | |
402 | for (ix = PadnamelistMAX(comppad_name); ix > 0; ix--) { | |
403 | PADNAME * const name = namepad[ix]; | |
404 | if (name && PadnamePV(name) && *PadnamePV(name) == '&') | |
405 | { | |
406 | CV * const innercv = MUTABLE_CV(curpad[ix]); | |
407 | U32 inner_rc; | |
408 | assert(innercv); | |
409 | assert(SvTYPE(innercv) != SVt_PVFM); | |
410 | inner_rc = SvREFCNT(innercv); | |
411 | assert(inner_rc); | |
412 | ||
413 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ | |
414 | curpad[ix] = NULL; | |
415 | SvREFCNT_dec_NN(innercv); | |
416 | inner_rc--; | |
417 | } | |
418 | ||
419 | /* in use, not just a prototype */ | |
420 | if (inner_rc && SvTYPE(innercv) == SVt_PVCV | |
421 | && (CvOUTSIDE(innercv) == cv)) | |
422 | { | |
423 | assert(CvWEAKOUTSIDE(innercv)); | |
424 | /* don't relink to grandfather if he's being freed */ | |
425 | if (outercv && SvREFCNT(outercv)) { | |
426 | CvWEAKOUTSIDE_off(innercv); | |
427 | CvOUTSIDE(innercv) = outercv; | |
428 | CvOUTSIDE_SEQ(innercv) = seq; | |
429 | SvREFCNT_inc_simple_void_NN(outercv); | |
430 | } | |
431 | else { | |
432 | CvOUTSIDE(innercv) = NULL; | |
433 | } | |
434 | } | |
435 | } | |
436 | } | |
437 | } | |
438 | ||
439 | ix = PadlistMAX(padlist); | |
440 | while (ix > 0) { | |
441 | PAD * const sv = PadlistARRAY(padlist)[ix--]; | |
442 | if (sv) { | |
443 | if (sv == PL_comppad) { | |
444 | PL_comppad = NULL; | |
445 | PL_curpad = NULL; | |
446 | } | |
447 | SvREFCNT_dec_NN(sv); | |
448 | } | |
449 | } | |
450 | { | |
451 | PADNAMELIST * const names = PadlistNAMES(padlist); | |
452 | if (names == PL_comppad_name && PadnamelistREFCNT(names) == 1) | |
453 | PL_comppad_name = NULL; | |
454 | PadnamelistREFCNT_dec(names); | |
455 | } | |
456 | if (PadlistARRAY(padlist)) Safefree(PadlistARRAY(padlist)); | |
457 | Safefree(padlist); | |
458 | CvPADLIST_set(&cvbody, NULL); | |
c2736fce | 459 | } |
db6e00bd | 460 | else if (CvISXSUB(&cvbody)) |
1604cfb0 | 461 | CvHSCXT(&cvbody) = NULL; |
eacbb379 | 462 | /* else is (!CvISXSUB(&cvbody) && !CvPADLIST(&cvbody)) {do nothing;} */ |
c2736fce | 463 | |
c4528262 NC |
464 | |
465 | /* remove CvOUTSIDE unless this is an undef rather than a free */ | |
52ec28d5 | 466 | if (!SvREFCNT(cv)) { |
1604cfb0 MS |
467 | CV * outside = CvOUTSIDE(&cvbody); |
468 | if(outside) { | |
469 | CvOUTSIDE(&cvbody) = NULL; | |
470 | if (!CvWEAKOUTSIDE(&cvbody)) | |
471 | SvREFCNT_dec_NN(outside); | |
472 | } | |
c4528262 | 473 | } |
52ec28d5 | 474 | if (CvCONST(&cvbody)) { |
1604cfb0 MS |
475 | SvREFCNT_dec(MUTABLE_SV(CvXSUBANY(&cvbody).any_ptr)); |
476 | /* CvCONST_off(cv); *//* turned off below */ | |
c4528262 NC |
477 | } |
478 | /* delete all flags except WEAKOUTSIDE and CVGV_RC, which indicate the | |
b7acb0a3 FC |
479 | * ref status of CvOUTSIDE and CvGV, and ANON, NAMED and |
480 | * LEXICAL, which are used to determine the sub's name. */ | |
52ec28d5 | 481 | CvFLAGS(&cvbody) &= (CVf_WEAKOUTSIDE|CVf_CVGV_RC|CVf_ANON|CVf_LEXICAL |
1604cfb0 | 482 | |CVf_NAMED); |
c4528262 | 483 | } |
dd2155a4 | 484 | |
50dc2bd3 FC |
485 | /* |
486 | =for apidoc cv_forget_slab | |
487 | ||
796b6530 | 488 | When a CV has a reference count on its slab (C<CvSLABBED>), it is responsible |
50dc2bd3 FC |
489 | for making sure it is freed. (Hence, no two CVs should ever have a |
490 | reference count on the same slab.) The CV only needs to reference the slab | |
796b6530 | 491 | during compilation. Once it is compiled and C<CvROOT> attached, it has |
50dc2bd3 FC |
492 | finished its job, so it can forget the slab. |
493 | ||
494 | =cut | |
495 | */ | |
496 | ||
8be227ab FC |
497 | void |
498 | Perl_cv_forget_slab(pTHX_ CV *cv) | |
499 | { | |
de0885da | 500 | bool slabbed; |
3107b51f | 501 | OPSLAB *slab = NULL; |
8be227ab | 502 | |
de0885da DM |
503 | if (!cv) |
504 | return; | |
505 | slabbed = cBOOL(CvSLABBED(cv)); | |
8be227ab FC |
506 | if (!slabbed) return; |
507 | ||
508 | CvSLABBED_off(cv); | |
509 | ||
3107b51f FC |
510 | if (CvROOT(cv)) slab = OpSLAB(CvROOT(cv)); |
511 | else if (CvSTART(cv)) slab = (OPSLAB *)CvSTART(cv); | |
7aef8e5b | 512 | #ifdef DEBUGGING |
eb212a1c | 513 | else if (slabbed) Perl_warn(aTHX_ "Slab leaked from cv %p", (void*)cv); |
7aef8e5b | 514 | #endif |
3107b51f | 515 | |
3107b51f | 516 | if (slab) { |
f3e29105 | 517 | #ifdef PERL_DEBUG_READONLY_OPS |
1604cfb0 | 518 | const size_t refcnt = slab->opslab_refcnt; |
f3e29105 | 519 | #endif |
1604cfb0 | 520 | OpslabREFCNT_dec(slab); |
f3e29105 | 521 | #ifdef PERL_DEBUG_READONLY_OPS |
1604cfb0 | 522 | if (refcnt > 1) Slab_to_ro(slab); |
8be227ab | 523 | #endif |
f3e29105 | 524 | } |
7aef8e5b | 525 | } |
8be227ab | 526 | |
cc76b5cc | 527 | /* |
44170c9a | 528 | =for apidoc pad_alloc_name |
cc76b5cc | 529 | |
1a115e49 FC |
530 | Allocates a place in the currently-compiling |
531 | pad (via L<perlapi/pad_alloc>) and | |
2d7f6611 | 532 | then stores a name for that entry. C<name> is adopted and |
307a54be | 533 | becomes the name entry; it must already contain the name |
2d7f6611 KW |
534 | string. C<typestash> and C<ourstash> and the C<padadd_STATE> |
535 | flag get added to C<name>. None of the other | |
1a115e49 | 536 | processing of L<perlapi/pad_add_name_pvn> |
cc76b5cc Z |
537 | is done. Returns the offset of the allocated pad slot. |
538 | ||
539 | =cut | |
540 | */ | |
541 | ||
3291825f | 542 | static PADOFFSET |
e1c02f84 | 543 | S_pad_alloc_name(pTHX_ PADNAME *name, U32 flags, HV *typestash, |
1604cfb0 | 544 | HV *ourstash) |
3291825f | 545 | { |
3291825f NC |
546 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
547 | ||
cc76b5cc | 548 | PERL_ARGS_ASSERT_PAD_ALLOC_NAME; |
3291825f | 549 | |
cc76b5cc | 550 | ASSERT_CURPAD_ACTIVE("pad_alloc_name"); |
3291825f NC |
551 | |
552 | if (typestash) { | |
1604cfb0 MS |
553 | SvPAD_TYPED_on(name); |
554 | PadnameTYPE(name) = | |
555 | MUTABLE_HV(SvREFCNT_inc_simple_NN(MUTABLE_SV(typestash))); | |
3291825f NC |
556 | } |
557 | if (ourstash) { | |
1604cfb0 MS |
558 | SvPAD_OUR_on(name); |
559 | SvOURSTASH_set(name, ourstash); | |
560 | SvREFCNT_inc_simple_void_NN(ourstash); | |
3291825f | 561 | } |
59cfed7d | 562 | else if (flags & padadd_STATE) { |
1604cfb0 | 563 | SvPAD_STATE_on(name); |
3291825f NC |
564 | } |
565 | ||
0f94cb1f | 566 | padnamelist_store(PL_comppad_name, offset, name); |
dd5d1b89 | 567 | if (PadnameLEN(name) > 1) |
1604cfb0 | 568 | PadnamelistMAXNAMED(PL_comppad_name) = offset; |
3291825f NC |
569 | return offset; |
570 | } | |
571 | ||
dd2155a4 | 572 | /* |
44170c9a | 573 | =for apidoc pad_add_name_pvn |
dd2155a4 | 574 | |
cc76b5cc Z |
575 | Allocates a place in the currently-compiling pad for a named lexical |
576 | variable. Stores the name and other metadata in the name part of the | |
577 | pad, and makes preparations to manage the variable's lexical scoping. | |
578 | Returns the offset of the allocated pad slot. | |
dd2155a4 | 579 | |
2d7f6611 KW |
580 | C<namepv>/C<namelen> specify the variable's name, including leading sigil. |
581 | If C<typestash> is non-null, the name is for a typed lexical, and this | |
582 | identifies the type. If C<ourstash> is non-null, it's a lexical reference | |
cc76b5cc Z |
583 | to a package variable, and this identifies the package. The following |
584 | flags can be OR'ed together: | |
585 | ||
8560fbdd KW |
586 | padadd_OUR redundantly specifies if it's a package var |
587 | padadd_STATE variable will retain value persistently | |
588 | padadd_NO_DUP_CHECK skip check for lexical shadowing | |
dd2155a4 DM |
589 | |
590 | =cut | |
591 | */ | |
592 | ||
dd2155a4 | 593 | PADOFFSET |
cc76b5cc | 594 | Perl_pad_add_name_pvn(pTHX_ const char *namepv, STRLEN namelen, |
1604cfb0 | 595 | U32 flags, HV *typestash, HV *ourstash) |
dd2155a4 | 596 | { |
3291825f | 597 | PADOFFSET offset; |
e1c02f84 | 598 | PADNAME *name; |
dd2155a4 | 599 | |
cc76b5cc | 600 | PERL_ARGS_ASSERT_PAD_ADD_NAME_PVN; |
7918f24d | 601 | |
2502ffdf | 602 | if (flags & ~(padadd_OUR|padadd_STATE|padadd_NO_DUP_CHECK)) |
1604cfb0 MS |
603 | Perl_croak(aTHX_ "panic: pad_add_name_pvn illegal flag bits 0x%" UVxf, |
604 | (UV)flags); | |
cca43f78 | 605 | |
0f94cb1f | 606 | name = newPADNAMEpvn(namepv, namelen); |
dd2155a4 | 607 | |
59cfed7d | 608 | if ((flags & padadd_NO_DUP_CHECK) == 0) { |
1604cfb0 MS |
609 | ENTER; |
610 | SAVEFREEPADNAME(name); /* in case of fatal warnings */ | |
611 | /* check for duplicate declaration */ | |
612 | pad_check_dup(name, flags & padadd_OUR, ourstash); | |
613 | PadnameREFCNT(name)++; | |
614 | LEAVE; | |
2d12d04f NC |
615 | } |
616 | ||
2502ffdf | 617 | offset = pad_alloc_name(name, flags, typestash, ourstash); |
3291825f NC |
618 | |
619 | /* not yet introduced */ | |
e1c02f84 FC |
620 | COP_SEQ_RANGE_LOW_set(name, PERL_PADSEQ_INTRO); |
621 | COP_SEQ_RANGE_HIGH_set(name, 0); | |
3291825f NC |
622 | |
623 | if (!PL_min_intro_pending) | |
1604cfb0 | 624 | PL_min_intro_pending = offset; |
3291825f NC |
625 | PL_max_intro_pending = offset; |
626 | /* if it's not a simple scalar, replace with an AV or HV */ | |
c1bf42f3 NC |
627 | assert(SvTYPE(PL_curpad[offset]) == SVt_NULL); |
628 | assert(SvREFCNT(PL_curpad[offset]) == 1); | |
cc76b5cc | 629 | if (namelen != 0 && *namepv == '@') |
1604cfb0 | 630 | sv_upgrade(PL_curpad[offset], SVt_PVAV); |
cc76b5cc | 631 | else if (namelen != 0 && *namepv == '%') |
1604cfb0 | 632 | sv_upgrade(PL_curpad[offset], SVt_PVHV); |
6d5c2147 | 633 | else if (namelen != 0 && *namepv == '&') |
1604cfb0 | 634 | sv_upgrade(PL_curpad[offset], SVt_PVCV); |
c1bf42f3 | 635 | assert(SvPADMY(PL_curpad[offset])); |
3291825f | 636 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1604cfb0 MS |
637 | "Pad addname: %ld \"%s\" new lex=0x%" UVxf "\n", |
638 | (long)offset, PadnamePV(name), | |
639 | PTR2UV(PL_curpad[offset]))); | |
dd2155a4 DM |
640 | |
641 | return offset; | |
642 | } | |
643 | ||
cc76b5cc | 644 | /* |
44170c9a | 645 | =for apidoc pad_add_name_pv |
dd2155a4 | 646 | |
cc76b5cc Z |
647 | Exactly like L</pad_add_name_pvn>, but takes a nul-terminated string |
648 | instead of a string/length pair. | |
dd2155a4 | 649 | |
cc76b5cc Z |
650 | =cut |
651 | */ | |
652 | ||
653 | PADOFFSET | |
654 | Perl_pad_add_name_pv(pTHX_ const char *name, | |
1604cfb0 | 655 | const U32 flags, HV *typestash, HV *ourstash) |
cc76b5cc Z |
656 | { |
657 | PERL_ARGS_ASSERT_PAD_ADD_NAME_PV; | |
658 | return pad_add_name_pvn(name, strlen(name), flags, typestash, ourstash); | |
659 | } | |
dd2155a4 DM |
660 | |
661 | /* | |
44170c9a | 662 | =for apidoc pad_add_name_sv |
dd2155a4 | 663 | |
cc76b5cc Z |
664 | Exactly like L</pad_add_name_pvn>, but takes the name string in the form |
665 | of an SV instead of a string/length pair. | |
666 | ||
667 | =cut | |
668 | */ | |
669 | ||
670 | PADOFFSET | |
671 | Perl_pad_add_name_sv(pTHX_ SV *name, U32 flags, HV *typestash, HV *ourstash) | |
672 | { | |
673 | char *namepv; | |
674 | STRLEN namelen; | |
675 | PERL_ARGS_ASSERT_PAD_ADD_NAME_SV; | |
2502ffdf | 676 | namepv = SvPVutf8(name, namelen); |
cc76b5cc Z |
677 | return pad_add_name_pvn(namepv, namelen, flags, typestash, ourstash); |
678 | } | |
679 | ||
680 | /* | |
44170c9a | 681 | =for apidoc pad_alloc |
cc76b5cc Z |
682 | |
683 | Allocates a place in the currently-compiling pad, | |
684 | returning the offset of the allocated pad slot. | |
685 | No name is initially attached to the pad slot. | |
2d7f6611 | 686 | C<tmptype> is a set of flags indicating the kind of pad entry required, |
cc76b5cc Z |
687 | which will be set in the value SV for the allocated pad entry: |
688 | ||
689 | SVs_PADMY named lexical variable ("my", "our", "state") | |
690 | SVs_PADTMP unnamed temporary store | |
325e1816 FC |
691 | SVf_READONLY constant shared between recursion levels |
692 | ||
693 | C<SVf_READONLY> has been supported here only since perl 5.20. To work with | |
c370bd2e FC |
694 | earlier versions as well, use C<SVf_READONLY|SVs_PADTMP>. C<SVf_READONLY> |
695 | does not cause the SV in the pad slot to be marked read-only, but simply | |
696 | tells C<pad_alloc> that it I<will> be made read-only (by the caller), or at | |
697 | least should be treated as such. | |
cc76b5cc | 698 | |
2d7f6611 | 699 | C<optype> should be an opcode indicating the type of operation that the |
cc76b5cc Z |
700 | pad entry is to support. This doesn't affect operational semantics, |
701 | but is used for debugging. | |
dd2155a4 DM |
702 | |
703 | =cut | |
704 | */ | |
705 | ||
dd2155a4 DM |
706 | PADOFFSET |
707 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) | |
708 | { | |
709 | SV *sv; | |
d12be05d | 710 | PADOFFSET retval; |
dd2155a4 | 711 | |
6136c704 | 712 | PERL_UNUSED_ARG(optype); |
f3548bdc DM |
713 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
714 | ||
dd2155a4 | 715 | if (AvARRAY(PL_comppad) != PL_curpad) |
1604cfb0 MS |
716 | Perl_croak(aTHX_ "panic: pad_alloc, %p!=%p", |
717 | AvARRAY(PL_comppad), PL_curpad); | |
dd2155a4 | 718 | if (PL_pad_reset_pending) |
1604cfb0 | 719 | pad_reset(); |
c0683843 | 720 | if (tmptype == SVs_PADMY) { /* Not & because this ‘flag’ is 0. */ |
1604cfb0 | 721 | /* For a my, simply push a null SV onto the end of PL_comppad. */ |
8fcb2425 | 722 | sv = *av_store_simple(PL_comppad, AvFILLp(PL_comppad) + 1, newSV_type(SVt_NULL)); |
1604cfb0 | 723 | retval = (PADOFFSET)AvFILLp(PL_comppad); |
dd2155a4 DM |
724 | } |
725 | else { | |
1604cfb0 MS |
726 | /* For a tmp, scan the pad from PL_padix upwards |
727 | * for a slot which has no name and no active value. | |
728 | * For a constant, likewise, but use PL_constpadix. | |
729 | */ | |
730 | PADNAME * const * const names = PadnamelistARRAY(PL_comppad_name); | |
731 | const SSize_t names_fill = PadnamelistMAX(PL_comppad_name); | |
732 | const bool konst = cBOOL(tmptype & SVf_READONLY); | |
733 | retval = konst ? PL_constpadix : PL_padix; | |
734 | for (;;) { | |
735 | /* | |
736 | * Entries that close over unavailable variables | |
737 | * in outer subs contain values not marked PADMY. | |
738 | * Thus we must skip, not just pad values that are | |
739 | * marked as current pad values, but also those with names. | |
740 | * If pad_reset is enabled, ‘current’ means different | |
741 | * things depending on whether we are allocating a con- | |
742 | * stant or a target. For a target, things marked PADTMP | |
743 | * can be reused; not so for constants. | |
744 | */ | |
745 | PADNAME *pn; | |
746 | if (++retval <= names_fill && | |
747 | (pn = names[retval]) && PadnamePV(pn)) | |
748 | continue; | |
310f47b6 | 749 | sv = *av_fetch_simple(PL_comppad, retval, TRUE); |
1604cfb0 | 750 | if (!(SvFLAGS(sv) & |
53de1311 | 751 | #ifdef USE_PAD_RESET |
1604cfb0 | 752 | (konst ? SVs_PADTMP : 0) |
a90643eb | 753 | #else |
1604cfb0 | 754 | SVs_PADTMP |
a90643eb | 755 | #endif |
1604cfb0 MS |
756 | )) |
757 | break; | |
758 | } | |
759 | if (konst) { | |
760 | padnamelist_store(PL_comppad_name, retval, &PL_padname_const); | |
761 | tmptype &= ~SVf_READONLY; | |
762 | tmptype |= SVs_PADTMP; | |
763 | } | |
764 | *(konst ? &PL_constpadix : &PL_padix) = retval; | |
dd2155a4 DM |
765 | } |
766 | SvFLAGS(sv) |= tmptype; | |
767 | PL_curpad = AvARRAY(PL_comppad); | |
768 | ||
769 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1604cfb0 MS |
770 | "Pad 0x%" UVxf "[0x%" UVxf "] alloc: %ld for %s\n", |
771 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, | |
772 | PL_op_name[optype])); | |
fd0854ff DM |
773 | #ifdef DEBUG_LEAKING_SCALARS |
774 | sv->sv_debug_optype = optype; | |
775 | sv->sv_debug_inpad = 1; | |
fd0854ff | 776 | #endif |
d12be05d | 777 | return retval; |
dd2155a4 DM |
778 | } |
779 | ||
780 | /* | |
44170c9a | 781 | =for apidoc pad_add_anon |
dd2155a4 | 782 | |
cc76b5cc Z |
783 | Allocates a place in the currently-compiling pad (via L</pad_alloc>) |
784 | for an anonymous function that is lexically scoped inside the | |
785 | currently-compiling function. | |
2d7f6611 | 786 | The function C<func> is linked into the pad, and its C<CvOUTSIDE> link |
cc76b5cc Z |
787 | to the outer scope is weakened to avoid a reference loop. |
788 | ||
84eea980 FC |
789 | One reference count is stolen, so you may need to do C<SvREFCNT_inc(func)>. |
790 | ||
2d7f6611 | 791 | C<optype> should be an opcode indicating the type of operation that the |
cc76b5cc Z |
792 | pad entry is to support. This doesn't affect operational semantics, |
793 | but is used for debugging. | |
dd2155a4 DM |
794 | |
795 | =cut | |
796 | */ | |
797 | ||
798 | PADOFFSET | |
cc76b5cc | 799 | Perl_pad_add_anon(pTHX_ CV* func, I32 optype) |
dd2155a4 DM |
800 | { |
801 | PADOFFSET ix; | |
0f94cb1f | 802 | PADNAME * const name = newPADNAMEpvn("&", 1); |
7918f24d NC |
803 | |
804 | PERL_ARGS_ASSERT_PAD_ADD_ANON; | |
74a9453a | 805 | assert (SvTYPE(func) == SVt_PVCV); |
7918f24d | 806 | |
1dba731d | 807 | pad_peg("add_anon"); |
0d311cdb | 808 | /* These two aren't used; just make sure they're not equal to |
0f94cb1f FC |
809 | * PERL_PADSEQ_INTRO. They should be 0 by default. */ |
810 | assert(COP_SEQ_RANGE_LOW (name) != PERL_PADSEQ_INTRO); | |
811 | assert(COP_SEQ_RANGE_HIGH(name) != PERL_PADSEQ_INTRO); | |
cc76b5cc | 812 | ix = pad_alloc(optype, SVs_PADMY); |
9b7476d7 | 813 | padnamelist_store(PL_comppad_name, ix, name); |
74a9453a | 814 | av_store(PL_comppad, ix, (SV*)func); |
7dafbf52 DM |
815 | |
816 | /* to avoid ref loops, we never have parent + child referencing each | |
817 | * other simultaneously */ | |
74a9453a | 818 | if (CvOUTSIDE(func)) { |
1604cfb0 MS |
819 | assert(!CvWEAKOUTSIDE(func)); |
820 | CvWEAKOUTSIDE_on(func); | |
821 | SvREFCNT_dec_NN(CvOUTSIDE(func)); | |
7dafbf52 | 822 | } |
dd2155a4 DM |
823 | return ix; |
824 | } | |
825 | ||
a70f21d0 FC |
826 | void |
827 | Perl_pad_add_weakref(pTHX_ CV* func) | |
828 | { | |
829 | const PADOFFSET ix = pad_alloc(OP_NULL, SVs_PADMY); | |
830 | PADNAME * const name = newPADNAMEpvn("&", 1); | |
831 | SV * const rv = newRV_inc((SV *)func); | |
832 | ||
833 | PERL_ARGS_ASSERT_PAD_ADD_WEAKREF; | |
834 | ||
835 | /* These two aren't used; just make sure they're not equal to | |
836 | * PERL_PADSEQ_INTRO. They should be 0 by default. */ | |
837 | assert(COP_SEQ_RANGE_LOW (name) != PERL_PADSEQ_INTRO); | |
838 | assert(COP_SEQ_RANGE_HIGH(name) != PERL_PADSEQ_INTRO); | |
839 | padnamelist_store(PL_comppad_name, ix, name); | |
840 | sv_rvweaken(rv); | |
841 | av_store(PL_comppad, ix, rv); | |
842 | } | |
843 | ||
dd2155a4 | 844 | /* |
13087dd8 | 845 | =for apidoc pad_check_dup |
dd2155a4 DM |
846 | |
847 | Check for duplicate declarations: report any of: | |
13087dd8 | 848 | |
796b6530 KW |
849 | * a 'my' in the current scope with the same name; |
850 | * an 'our' (anywhere in the pad) with the same name and the | |
851 | same stash as 'ourstash' | |
13087dd8 | 852 | |
796b6530 | 853 | C<is_our> indicates that the name to check is an C<"our"> declaration. |
dd2155a4 DM |
854 | |
855 | =cut | |
856 | */ | |
857 | ||
20381b50 | 858 | STATIC void |
e1c02f84 | 859 | S_pad_check_dup(pTHX_ PADNAME *name, U32 flags, const HV *ourstash) |
dd2155a4 | 860 | { |
0aaff5a1 | 861 | PADNAME **svp; |
dd2155a4 | 862 | PADOFFSET top, off; |
59cfed7d | 863 | const U32 is_our = flags & padadd_OUR; |
dd2155a4 | 864 | |
7918f24d NC |
865 | PERL_ARGS_ASSERT_PAD_CHECK_DUP; |
866 | ||
f3548bdc | 867 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
35f82371 | 868 | |
59cfed7d | 869 | assert((flags & ~padadd_OUR) == 0); |
35f82371 | 870 | |
52e3acf8 | 871 | if (PadnamelistMAX(PL_comppad_name) < 0 || !ckWARN(WARN_SHADOW)) |
1604cfb0 | 872 | return; /* nothing to check */ |
dd2155a4 | 873 | |
9b7476d7 FC |
874 | svp = PadnamelistARRAY(PL_comppad_name); |
875 | top = PadnamelistMAX(PL_comppad_name); | |
dd2155a4 | 876 | /* check the current scope */ |
d12be05d | 877 | for (off = top; off > PL_comppad_name_floor; off--) { |
1604cfb0 MS |
878 | PADNAME * const sv = svp[off]; |
879 | if (sv | |
880 | && PadnameLEN(sv) == PadnameLEN(name) | |
881 | && !PadnameOUTER(sv) | |
882 | && ( COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO | |
883 | || COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO) | |
884 | && memEQ(PadnamePV(sv), PadnamePV(name), PadnameLEN(name))) | |
885 | { | |
886 | if (is_our && (SvPAD_OUR(sv))) | |
887 | break; /* "our" masking "our" */ | |
888 | /* diag_listed_as: "%s" variable %s masks earlier declaration in same %s */ | |
889 | Perl_warner(aTHX_ packWARN(WARN_SHADOW), | |
890 | "\"%s\" %s %" PNf " masks earlier declaration in same %s", | |
891 | ( is_our ? "our" : | |
49fb8620 DM |
892 | PL_parser->in_my == KEY_my ? "my" : |
893 | PL_parser->in_my == KEY_sigvar ? "my" : | |
894 | "state" ), | |
1604cfb0 MS |
895 | *PadnamePV(sv) == '&' ? "subroutine" : "variable", |
896 | PNfARG(sv), | |
897 | (COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO | |
898 | ? "scope" : "statement")); | |
899 | --off; | |
900 | break; | |
901 | } | |
dd2155a4 DM |
902 | } |
903 | /* check the rest of the pad */ | |
904 | if (is_our) { | |
1604cfb0 MS |
905 | while (off > 0) { |
906 | PADNAME * const sv = svp[off]; | |
907 | if (sv | |
908 | && PadnameLEN(sv) == PadnameLEN(name) | |
909 | && !PadnameOUTER(sv) | |
910 | && ( COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO | |
911 | || COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO) | |
912 | && SvOURSTASH(sv) == ourstash | |
913 | && memEQ(PadnamePV(sv), PadnamePV(name), PadnameLEN(name))) | |
914 | { | |
915 | Perl_warner(aTHX_ packWARN(WARN_SHADOW), | |
916 | "\"our\" variable %" PNf " redeclared", PNfARG(sv)); | |
917 | if (off <= PL_comppad_name_floor) | |
918 | Perl_warner(aTHX_ packWARN(WARN_SHADOW), | |
919 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); | |
920 | break; | |
921 | } | |
922 | --off; | |
923 | } | |
dd2155a4 DM |
924 | } |
925 | } | |
926 | ||
927 | ||
dd2155a4 | 928 | /* |
44170c9a | 929 | =for apidoc pad_findmy_pvn |
dd2155a4 | 930 | |
cc76b5cc Z |
931 | Given the name of a lexical variable, find its position in the |
932 | currently-compiling pad. | |
2d7f6611 KW |
933 | C<namepv>/C<namelen> specify the variable's name, including leading sigil. |
934 | C<flags> is reserved and must be zero. | |
cc76b5cc Z |
935 | If it is not in the current pad but appears in the pad of any lexically |
936 | enclosing scope, then a pseudo-entry for it is added in the current pad. | |
937 | Returns the offset in the current pad, | |
938 | or C<NOT_IN_PAD> if no such lexical is in scope. | |
dd2155a4 DM |
939 | |
940 | =cut | |
941 | */ | |
942 | ||
943 | PADOFFSET | |
cc76b5cc | 944 | Perl_pad_findmy_pvn(pTHX_ const char *namepv, STRLEN namelen, U32 flags) |
dd2155a4 | 945 | { |
e1c02f84 | 946 | PADNAME *out_pn; |
b5c19bd7 | 947 | int out_flags; |
d12be05d | 948 | PADOFFSET offset; |
9b7476d7 | 949 | const PADNAMELIST *namelist; |
e1c02f84 | 950 | PADNAME **name_p; |
dd2155a4 | 951 | |
cc76b5cc | 952 | PERL_ARGS_ASSERT_PAD_FINDMY_PVN; |
7918f24d | 953 | |
cc76b5cc | 954 | pad_peg("pad_findmy_pvn"); |
f8f98e0a | 955 | |
2502ffdf | 956 | if (flags) |
1604cfb0 MS |
957 | Perl_croak(aTHX_ "panic: pad_findmy_pvn illegal flag bits 0x%" UVxf, |
958 | (UV)flags); | |
f8f98e0a | 959 | |
b12396ac TC |
960 | /* compilation errors can zero PL_compcv */ |
961 | if (!PL_compcv) | |
962 | return NOT_IN_PAD; | |
963 | ||
fbb889c8 | 964 | offset = pad_findlex(namepv, namelen, flags, |
e1c02f84 | 965 | PL_compcv, PL_cop_seqmax, 1, NULL, &out_pn, &out_flags); |
d12be05d | 966 | if (offset != NOT_IN_PAD) |
1604cfb0 | 967 | return offset; |
929a0744 | 968 | |
f0727190 FC |
969 | /* Skip the ‘our’ hack for subroutines, as the warning does not apply. |
970 | */ | |
971 | if (*namepv == '&') return NOT_IN_PAD; | |
972 | ||
929a0744 DM |
973 | /* look for an our that's being introduced; this allows |
974 | * our $foo = 0 unless defined $foo; | |
975 | * to not give a warning. (Yes, this is a hack) */ | |
976 | ||
9b7476d7 FC |
977 | namelist = PadlistNAMES(CvPADLIST(PL_compcv)); |
978 | name_p = PadnamelistARRAY(namelist); | |
979 | for (offset = PadnamelistMAXNAMED(namelist); offset > 0; offset--) { | |
e1c02f84 FC |
980 | const PADNAME * const name = name_p[offset]; |
981 | if (name && PadnameLEN(name) == namelen | |
982 | && !PadnameOUTER(name) | |
983 | && (PadnameIsOUR(name)) | |
2502ffdf FC |
984 | && ( PadnamePV(name) == namepv |
985 | || memEQ(PadnamePV(name), namepv, namelen) ) | |
e1c02f84 | 986 | && COP_SEQ_RANGE_LOW(name) == PERL_PADSEQ_INTRO |
1604cfb0 MS |
987 | ) |
988 | return offset; | |
929a0744 DM |
989 | } |
990 | return NOT_IN_PAD; | |
dd2155a4 DM |
991 | } |
992 | ||
e1f795dc | 993 | /* |
44170c9a | 994 | =for apidoc pad_findmy_pv |
cc76b5cc Z |
995 | |
996 | Exactly like L</pad_findmy_pvn>, but takes a nul-terminated string | |
997 | instead of a string/length pair. | |
998 | ||
999 | =cut | |
1000 | */ | |
1001 | ||
1002 | PADOFFSET | |
1003 | Perl_pad_findmy_pv(pTHX_ const char *name, U32 flags) | |
1004 | { | |
1005 | PERL_ARGS_ASSERT_PAD_FINDMY_PV; | |
1006 | return pad_findmy_pvn(name, strlen(name), flags); | |
1007 | } | |
1008 | ||
1009 | /* | |
44170c9a | 1010 | =for apidoc pad_findmy_sv |
cc76b5cc Z |
1011 | |
1012 | Exactly like L</pad_findmy_pvn>, but takes the name string in the form | |
1013 | of an SV instead of a string/length pair. | |
1014 | ||
1015 | =cut | |
1016 | */ | |
1017 | ||
1018 | PADOFFSET | |
1019 | Perl_pad_findmy_sv(pTHX_ SV *name, U32 flags) | |
1020 | { | |
1021 | char *namepv; | |
1022 | STRLEN namelen; | |
1023 | PERL_ARGS_ASSERT_PAD_FINDMY_SV; | |
2502ffdf | 1024 | namepv = SvPVutf8(name, namelen); |
cc76b5cc Z |
1025 | return pad_findmy_pvn(namepv, namelen, flags); |
1026 | } | |
1027 | ||
1028 | /* | |
44170c9a | 1029 | =for apidoc find_rundefsvoffset |
cc76b5cc | 1030 | |
af7ce3e6 FC |
1031 | Until the lexical C<$_> feature was removed, this function would |
1032 | find the position of the lexical C<$_> in the pad of the | |
1cdc5f0b | 1033 | currently-executing function and return the offset in the current pad, |
af7ce3e6 FC |
1034 | or C<NOT_IN_PAD>. |
1035 | ||
1036 | Now it always returns C<NOT_IN_PAD>. | |
cc76b5cc Z |
1037 | |
1038 | =cut | |
1039 | */ | |
e1f795dc RGS |
1040 | |
1041 | PADOFFSET | |
29289021 | 1042 | Perl_find_rundefsvoffset(pTHX) |
e1f795dc | 1043 | { |
af7ce3e6 FC |
1044 | PERL_UNUSED_CONTEXT; /* Can we just remove the pTHX from the sig? */ |
1045 | return NOT_IN_PAD; | |
e1f795dc | 1046 | } |
dd2155a4 | 1047 | |
dd2155a4 | 1048 | /* |
44170c9a | 1049 | =for apidoc find_rundefsv |
cc76b5cc | 1050 | |
af7ce3e6 | 1051 | Returns the global variable C<$_>. |
cc76b5cc Z |
1052 | |
1053 | =cut | |
1054 | */ | |
789bd863 VP |
1055 | |
1056 | SV * | |
1057 | Perl_find_rundefsv(pTHX) | |
1058 | { | |
af7ce3e6 | 1059 | return DEFSV; |
789bd863 VP |
1060 | } |
1061 | ||
1062 | /* | |
44170c9a | 1063 | =for apidoc pad_findlex |
dd2155a4 | 1064 | |
72d33970 | 1065 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
b5c19bd7 DM |
1066 | in the inner pads if it's found in an outer one. |
1067 | ||
1068 | Returns the offset in the bottom pad of the lex or the fake lex. | |
796b6530 KW |
1069 | C<cv> is the CV in which to start the search, and seq is the current C<cop_seq> |
1070 | to match against. If C<warn> is true, print appropriate warnings. The C<out_>* | |
b5c19bd7 | 1071 | vars return values, and so are pointers to where the returned values |
796b6530 KW |
1072 | should be stored. C<out_capture>, if non-null, requests that the innermost |
1073 | instance of the lexical is captured; C<out_name> is set to the innermost | |
1074 | matched pad name or fake pad name; C<out_flags> returns the flags normally | |
1075 | associated with the C<PARENT_FAKELEX_FLAGS> field of a fake pad name. | |
b5c19bd7 | 1076 | |
796b6530 | 1077 | Note that C<pad_findlex()> is recursive; it recurses up the chain of CVs, |
72d33970 FC |
1078 | then comes back down, adding fake entries |
1079 | as it goes. It has to be this way | |
f1460a66 | 1080 | because fake names in anon prototypes have to store in C<xpadn_low> the |
9420b268 | 1081 | index into the parent pad. |
dd2155a4 DM |
1082 | |
1083 | =cut | |
1084 | */ | |
1085 | ||
b5c19bd7 DM |
1086 | /* the CV has finished being compiled. This is not a sufficient test for |
1087 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ | |
1088 | #define CvCOMPILED(cv) CvROOT(cv) | |
1089 | ||
71f882da | 1090 | /* the CV does late binding of its lexicals */ |
e07561e6 | 1091 | #define CvLATE(cv) (CvANON(cv) || CvCLONE(cv) || SvTYPE(cv) == SVt_PVFM) |
71f882da | 1092 | |
445f13ff | 1093 | static void |
e6df7a56 | 1094 | S_unavailable(pTHX_ PADNAME *name) |
445f13ff FC |
1095 | { |
1096 | /* diag_listed_as: Variable "%s" is not available */ | |
1097 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), | |
1604cfb0 MS |
1098 | "%s \"%" PNf "\" is not available", |
1099 | *PadnamePV(name) == '&' | |
1100 | ? "Subroutine" | |
1101 | : "Variable", | |
1102 | PNfARG(name)); | |
445f13ff | 1103 | } |
b5c19bd7 | 1104 | |
dd2155a4 | 1105 | STATIC PADOFFSET |
fbb889c8 | 1106 | S_pad_findlex(pTHX_ const char *namepv, STRLEN namelen, U32 flags, const CV* cv, U32 seq, |
1604cfb0 | 1107 | int warn, SV** out_capture, PADNAME** out_name, int *out_flags) |
dd2155a4 | 1108 | { |
d12be05d | 1109 | PADOFFSET offset, new_offset; |
b5c19bd7 DM |
1110 | SV *new_capture; |
1111 | SV **new_capturep; | |
b70d5558 | 1112 | const PADLIST * const padlist = CvPADLIST(cv); |
7ef30830 | 1113 | const bool staleok = !!(flags & padadd_STALEOK); |
dd2155a4 | 1114 | |
7918f24d NC |
1115 | PERL_ARGS_ASSERT_PAD_FINDLEX; |
1116 | ||
2502ffdf FC |
1117 | flags &= ~ padadd_STALEOK; /* one-shot flag */ |
1118 | if (flags) | |
1604cfb0 MS |
1119 | Perl_croak(aTHX_ "panic: pad_findlex illegal flag bits 0x%" UVxf, |
1120 | (UV)flags); | |
2435e5d3 | 1121 | |
b5c19bd7 | 1122 | *out_flags = 0; |
a3985cdc | 1123 | |
b5c19bd7 | 1124 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1604cfb0 MS |
1125 | "Pad findlex cv=0x%" UVxf " searching \"%.*s\" seq=%d%s\n", |
1126 | PTR2UV(cv), (int)namelen, namepv, (int)seq, | |
1127 | out_capture ? " capturing" : "" )); | |
dd2155a4 | 1128 | |
b5c19bd7 | 1129 | /* first, search this pad */ |
dd2155a4 | 1130 | |
b5c19bd7 | 1131 | if (padlist) { /* not an undef CV */ |
1604cfb0 | 1132 | PADOFFSET fake_offset = 0; |
9b7476d7 | 1133 | const PADNAMELIST * const names = PadlistNAMES(padlist); |
1604cfb0 | 1134 | PADNAME * const * const name_p = PadnamelistARRAY(names); |
ee6cee0c | 1135 | |
1604cfb0 | 1136 | for (offset = PadnamelistMAXNAMED(names); offset > 0; offset--) { |
e1c02f84 FC |
1137 | const PADNAME * const name = name_p[offset]; |
1138 | if (name && PadnameLEN(name) == namelen | |
2502ffdf FC |
1139 | && ( PadnamePV(name) == namepv |
1140 | || memEQ(PadnamePV(name), namepv, namelen) )) | |
1604cfb0 MS |
1141 | { |
1142 | if (PadnameOUTER(name)) { | |
1143 | fake_offset = offset; /* in case we don't find a real one */ | |
1144 | continue; | |
1145 | } | |
1146 | if (PadnameIN_SCOPE(name, seq)) | |
1147 | break; | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ | |
1152 | if (offset > 0) { /* not fake */ | |
1153 | fake_offset = 0; | |
1154 | *out_name = name_p[offset]; /* return the name */ | |
1155 | ||
1156 | /* set PAD_FAKELEX_MULTI if this lex can have multiple | |
1157 | * instances. For now, we just test !CvUNIQUE(cv), but | |
1158 | * ideally, we should detect my's declared within loops | |
1159 | * etc - this would allow a wider range of 'not stayed | |
1160 | * shared' warnings. We also treated already-compiled | |
1161 | * lexes as not multi as viewed from evals. */ | |
1162 | ||
1163 | *out_flags = CvANON(cv) ? | |
1164 | PAD_FAKELEX_ANON : | |
1165 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) | |
1166 | ? PAD_FAKELEX_MULTI : 0; | |
1167 | ||
1168 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1169 | "Pad findlex cv=0x%" UVxf " matched: offset=%ld (%lu,%lu)\n", | |
1170 | PTR2UV(cv), (long)offset, | |
1171 | (unsigned long)COP_SEQ_RANGE_LOW(*out_name), | |
1172 | (unsigned long)COP_SEQ_RANGE_HIGH(*out_name))); | |
1173 | } | |
1174 | else { /* fake match */ | |
1175 | offset = fake_offset; | |
1176 | *out_name = name_p[offset]; /* return the name */ | |
1177 | *out_flags = PARENT_FAKELEX_FLAGS(*out_name); | |
1178 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1179 | "Pad findlex cv=0x%" UVxf " matched: offset=%ld flags=0x%lx index=%lu\n", | |
1180 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, | |
1181 | (unsigned long) PARENT_PAD_INDEX(*out_name) | |
1182 | )); | |
1183 | } | |
1184 | ||
1185 | /* return the lex? */ | |
1186 | ||
1187 | if (out_capture) { | |
1188 | ||
1189 | /* our ? */ | |
1190 | if (PadnameIsOUR(*out_name)) { | |
1191 | *out_capture = NULL; | |
1192 | return offset; | |
1193 | } | |
1194 | ||
1195 | /* trying to capture from an anon prototype? */ | |
1196 | if (CvCOMPILED(cv) | |
1197 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) | |
1198 | : *out_flags & PAD_FAKELEX_ANON) | |
1199 | { | |
1200 | if (warn) | |
1201 | S_unavailable(aTHX_ | |
1202 | *out_name); | |
1203 | ||
1204 | *out_capture = NULL; | |
1205 | } | |
1206 | ||
1207 | /* real value */ | |
1208 | else { | |
1209 | int newwarn = warn; | |
1210 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) | |
1211 | && !PadnameIsSTATE(name_p[offset]) | |
1212 | && warn && ckWARN(WARN_CLOSURE)) { | |
1213 | newwarn = 0; | |
1214 | /* diag_listed_as: Variable "%s" will not stay | |
1215 | shared */ | |
1216 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), | |
1217 | "%s \"%" UTF8f "\" will not stay shared", | |
1218 | *namepv == '&' ? "Subroutine" : "Variable", | |
1219 | UTF8fARG(1, namelen, namepv)); | |
1220 | } | |
1221 | ||
1222 | if (fake_offset && CvANON(cv) | |
1223 | && CvCLONE(cv) &&!CvCLONED(cv)) | |
1224 | { | |
1225 | PADNAME *n; | |
1226 | /* not yet caught - look further up */ | |
1227 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1228 | "Pad findlex cv=0x%" UVxf " chasing lex in outer pad\n", | |
1229 | PTR2UV(cv))); | |
1230 | n = *out_name; | |
1231 | (void) pad_findlex(namepv, namelen, flags, CvOUTSIDE(cv), | |
1232 | CvOUTSIDE_SEQ(cv), | |
1233 | newwarn, out_capture, out_name, out_flags); | |
1234 | *out_name = n; | |
1235 | return offset; | |
1236 | } | |
1237 | ||
1238 | *out_capture = AvARRAY(PadlistARRAY(padlist)[ | |
1239 | CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; | |
1240 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1241 | "Pad findlex cv=0x%" UVxf " found lex=0x%" UVxf "\n", | |
1242 | PTR2UV(cv), PTR2UV(*out_capture))); | |
1243 | ||
1244 | if (SvPADSTALE(*out_capture) | |
1245 | && (!CvDEPTH(cv) || !staleok) | |
1246 | && !PadnameIsSTATE(name_p[offset])) | |
1247 | { | |
1248 | S_unavailable(aTHX_ | |
1249 | name_p[offset]); | |
1250 | *out_capture = NULL; | |
1251 | } | |
1252 | } | |
1253 | if (!*out_capture) { | |
1254 | if (namelen != 0 && *namepv == '@') | |
7ea8b04b | 1255 | *out_capture = newSV_type_mortal(SVt_PVAV); |
1604cfb0 | 1256 | else if (namelen != 0 && *namepv == '%') |
7ea8b04b | 1257 | *out_capture = newSV_type_mortal(SVt_PVHV); |
1604cfb0 | 1258 | else if (namelen != 0 && *namepv == '&') |
7ea8b04b | 1259 | *out_capture = newSV_type_mortal(SVt_PVCV); |
1604cfb0 | 1260 | else |
7ea8b04b | 1261 | *out_capture = newSV_type_mortal(SVt_NULL); |
1604cfb0 MS |
1262 | } |
1263 | } | |
1264 | ||
1265 | return offset; | |
1266 | } | |
b5c19bd7 DM |
1267 | } |
1268 | ||
1269 | /* it's not in this pad - try above */ | |
1270 | ||
1271 | if (!CvOUTSIDE(cv)) | |
1604cfb0 | 1272 | return NOT_IN_PAD; |
9f7d9405 | 1273 | |
b5c19bd7 | 1274 | /* out_capture non-null means caller wants us to capture lex; in |
71f882da | 1275 | * addition we capture ourselves unless it's an ANON/format */ |
b5c19bd7 | 1276 | new_capturep = out_capture ? out_capture : |
1604cfb0 | 1277 | CvLATE(cv) ? NULL : &new_capture; |
b5c19bd7 | 1278 | |
7ef30830 | 1279 | offset = pad_findlex(namepv, namelen, |
1604cfb0 MS |
1280 | flags | padadd_STALEOK*(new_capturep == &new_capture), |
1281 | CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, | |
1282 | new_capturep, out_name, out_flags); | |
d12be05d | 1283 | if (offset == NOT_IN_PAD) |
1604cfb0 | 1284 | return NOT_IN_PAD; |
9f7d9405 | 1285 | |
b5c19bd7 DM |
1286 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
1287 | ||
1288 | /* don't add new fake entries (via eval) to CVs that we have already | |
1289 | * finished compiling, or to undef CVs */ | |
1290 | if (CvCOMPILED(cv) || !padlist) | |
1604cfb0 | 1291 | return 0; /* this dummy (and invalid) value isnt used by the caller */ |
b5c19bd7 DM |
1292 | |
1293 | { | |
1604cfb0 MS |
1294 | PADNAME *new_name = newPADNAMEouter(*out_name); |
1295 | PADNAMELIST * const ocomppad_name = PL_comppad_name; | |
1296 | PAD * const ocomppad = PL_comppad; | |
1297 | PL_comppad_name = PadlistNAMES(padlist); | |
1298 | PL_comppad = PadlistARRAY(padlist)[1]; | |
1299 | PL_curpad = AvARRAY(PL_comppad); | |
1300 | ||
1301 | new_offset | |
1302 | = pad_alloc_name(new_name, | |
1303 | PadnameIsSTATE(*out_name) ? padadd_STATE : 0, | |
1304 | PadnameTYPE(*out_name), | |
1305 | PadnameOURSTASH(*out_name) | |
1306 | ); | |
1307 | ||
1308 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1309 | "Pad addname: %ld \"%.*s\" FAKE\n", | |
1310 | (long)new_offset, | |
1311 | (int) PadnameLEN(new_name), | |
1312 | PadnamePV(new_name))); | |
1313 | PARENT_FAKELEX_FLAGS_set(new_name, *out_flags); | |
1314 | ||
1315 | PARENT_PAD_INDEX_set(new_name, 0); | |
1316 | if (PadnameIsOUR(new_name)) { | |
1317 | NOOP; /* do nothing */ | |
1318 | } | |
1319 | else if (CvLATE(cv)) { | |
1320 | /* delayed creation - just note the offset within parent pad */ | |
1321 | PARENT_PAD_INDEX_set(new_name, offset); | |
1322 | CvCLONE_on(cv); | |
1323 | } | |
1324 | else { | |
1325 | /* immediate creation - capture outer value right now */ | |
1326 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); | |
1327 | /* But also note the offset, as newMYSUB needs it */ | |
1328 | PARENT_PAD_INDEX_set(new_name, offset); | |
1329 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1330 | "Pad findlex cv=0x%" UVxf " saved captured sv 0x%" UVxf " at offset %ld\n", | |
1331 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); | |
1332 | } | |
1333 | *out_name = new_name; | |
1334 | *out_flags = PARENT_FAKELEX_FLAGS(new_name); | |
1335 | ||
1336 | PL_comppad_name = ocomppad_name; | |
1337 | PL_comppad = ocomppad; | |
1338 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL; | |
dd2155a4 | 1339 | } |
b5c19bd7 | 1340 | return new_offset; |
dd2155a4 DM |
1341 | } |
1342 | ||
fb8a9836 | 1343 | #ifdef DEBUGGING |
cc76b5cc | 1344 | |
dd2155a4 | 1345 | /* |
44170c9a | 1346 | =for apidoc pad_sv |
dd2155a4 | 1347 | |
2d7f6611 | 1348 | Get the value at offset C<po> in the current (compiling or executing) pad. |
796b6530 | 1349 | Use macro C<PAD_SV> instead of calling this function directly. |
dd2155a4 DM |
1350 | |
1351 | =cut | |
1352 | */ | |
1353 | ||
dd2155a4 DM |
1354 | SV * |
1355 | Perl_pad_sv(pTHX_ PADOFFSET po) | |
1356 | { | |
f3548bdc | 1357 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
dd2155a4 | 1358 | |
dd2155a4 | 1359 | if (!po) |
1604cfb0 | 1360 | Perl_croak(aTHX_ "panic: pad_sv po"); |
dd2155a4 | 1361 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
1604cfb0 MS |
1362 | "Pad 0x%" UVxf "[0x%" UVxf "] sv: %ld sv=0x%" UVxf "\n", |
1363 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) | |
dd2155a4 DM |
1364 | ); |
1365 | return PL_curpad[po]; | |
1366 | } | |
1367 | ||
dd2155a4 | 1368 | /* |
44170c9a | 1369 | =for apidoc pad_setsv |
dd2155a4 | 1370 | |
2d7f6611 | 1371 | Set the value at offset C<po> in the current (compiling or executing) pad. |
796b6530 | 1372 | Use the macro C<PAD_SETSV()> rather than calling this function directly. |
dd2155a4 DM |
1373 | |
1374 | =cut | |
1375 | */ | |
1376 | ||
dd2155a4 DM |
1377 | void |
1378 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) | |
1379 | { | |
7918f24d NC |
1380 | PERL_ARGS_ASSERT_PAD_SETSV; |
1381 | ||
f3548bdc | 1382 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
dd2155a4 DM |
1383 | |
1384 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1604cfb0 MS |
1385 | "Pad 0x%" UVxf "[0x%" UVxf "] setsv: %ld sv=0x%" UVxf "\n", |
1386 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) | |
dd2155a4 DM |
1387 | ); |
1388 | PL_curpad[po] = sv; | |
1389 | } | |
dd2155a4 | 1390 | |
cc76b5cc | 1391 | #endif /* DEBUGGING */ |
dd2155a4 DM |
1392 | |
1393 | /* | |
44170c9a | 1394 | =for apidoc pad_block_start |
dd2155a4 | 1395 | |
e89fca5e | 1396 | Update the pad compilation state variables on entry to a new block. |
dd2155a4 DM |
1397 | |
1398 | =cut | |
1399 | */ | |
1400 | ||
dd2155a4 DM |
1401 | void |
1402 | Perl_pad_block_start(pTHX_ int full) | |
1403 | { | |
f3548bdc | 1404 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
58541fd0 | 1405 | SAVESTRLEN(PL_comppad_name_floor); |
9b7476d7 | 1406 | PL_comppad_name_floor = PadnamelistMAX(PL_comppad_name); |
dd2155a4 | 1407 | if (full) |
1604cfb0 | 1408 | PL_comppad_name_fill = PL_comppad_name_floor; |
dd2155a4 | 1409 | if (PL_comppad_name_floor < 0) |
1604cfb0 | 1410 | PL_comppad_name_floor = 0; |
58541fd0 PE |
1411 | SAVESTRLEN(PL_min_intro_pending); |
1412 | SAVESTRLEN(PL_max_intro_pending); | |
dd2155a4 | 1413 | PL_min_intro_pending = 0; |
58541fd0 PE |
1414 | SAVESTRLEN(PL_comppad_name_fill); |
1415 | SAVESTRLEN(PL_padix_floor); | |
1780e744 FC |
1416 | /* PL_padix_floor is what PL_padix is reset to at the start of each |
1417 | statement, by pad_reset(). We set it when entering a new scope | |
1418 | to keep things like this working: | |
1604cfb0 | 1419 | print "$foo$bar", do { this(); that() . "foo" }; |
1780e744 FC |
1420 | We must not let "$foo$bar" and the later concatenation share the |
1421 | same target. */ | |
dd2155a4 DM |
1422 | PL_padix_floor = PL_padix; |
1423 | PL_pad_reset_pending = FALSE; | |
1424 | } | |
1425 | ||
dd2155a4 | 1426 | /* |
44170c9a | 1427 | =for apidoc intro_my |
dd2155a4 | 1428 | |
25f5d540 LM |
1429 | "Introduce" C<my> variables to visible status. This is called during parsing |
1430 | at the end of each statement to make lexical variables visible to subsequent | |
1431 | statements. | |
dd2155a4 DM |
1432 | |
1433 | =cut | |
1434 | */ | |
1435 | ||
1436 | U32 | |
1437 | Perl_intro_my(pTHX) | |
1438 | { | |
6a0435be | 1439 | PADNAME **svp; |
d12be05d | 1440 | PADOFFSET i; |
6012dc80 | 1441 | U32 seq; |
dd2155a4 | 1442 | |
f3548bdc | 1443 | ASSERT_CURPAD_ACTIVE("intro_my"); |
8635e3c2 | 1444 | if (PL_compiling.cop_seq) { |
1604cfb0 MS |
1445 | seq = PL_compiling.cop_seq; |
1446 | PL_compiling.cop_seq = 0; | |
8635e3c2 FC |
1447 | } |
1448 | else | |
1604cfb0 | 1449 | seq = PL_cop_seqmax; |
dd2155a4 | 1450 | if (! PL_min_intro_pending) |
1604cfb0 | 1451 | return seq; |
dd2155a4 | 1452 | |
9b7476d7 | 1453 | svp = PadnamelistARRAY(PL_comppad_name); |
dd2155a4 | 1454 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
1604cfb0 MS |
1455 | PADNAME * const sv = svp[i]; |
1456 | ||
1457 | if (sv && PadnameLEN(sv) && !PadnameOUTER(sv) | |
1458 | && COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO) | |
1459 | { | |
1460 | COP_SEQ_RANGE_HIGH_set(sv, PERL_PADSEQ_INTRO); /* Don't know scope end yet. */ | |
1461 | COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax); | |
1462 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1463 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", | |
1464 | (long)i, PadnamePV(sv), | |
1465 | (unsigned long)COP_SEQ_RANGE_LOW(sv), | |
1466 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
1467 | ); | |
1468 | } | |
dd2155a4 | 1469 | } |
953c8b80 | 1470 | COP_SEQMAX_INC; |
dd2155a4 DM |
1471 | PL_min_intro_pending = 0; |
1472 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ | |
1473 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1604cfb0 | 1474 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax))); |
dd2155a4 | 1475 | |
6012dc80 | 1476 | return seq; |
dd2155a4 DM |
1477 | } |
1478 | ||
1479 | /* | |
44170c9a | 1480 | =for apidoc pad_leavemy |
dd2155a4 DM |
1481 | |
1482 | Cleanup at end of scope during compilation: set the max seq number for | |
1483 | lexicals in this scope and warn of any lexicals that never got introduced. | |
1484 | ||
1485 | =cut | |
1486 | */ | |
1487 | ||
6d5c2147 | 1488 | OP * |
dd2155a4 DM |
1489 | Perl_pad_leavemy(pTHX) |
1490 | { | |
d12be05d | 1491 | PADOFFSET off; |
6d5c2147 | 1492 | OP *o = NULL; |
9b7476d7 | 1493 | PADNAME * const * const svp = PadnamelistARRAY(PL_comppad_name); |
dd2155a4 DM |
1494 | |
1495 | PL_pad_reset_pending = FALSE; | |
1496 | ||
f3548bdc | 1497 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
dd2155a4 | 1498 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
1604cfb0 MS |
1499 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
1500 | const PADNAME * const name = svp[off]; | |
1501 | if (name && PadnameLEN(name) && !PadnameOUTER(name)) | |
1502 | Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), | |
1503 | "%" PNf " never introduced", | |
1504 | PNfARG(name)); | |
1505 | } | |
dd2155a4 DM |
1506 | } |
1507 | /* "Deintroduce" my variables that are leaving with this scope. */ | |
9b7476d7 | 1508 | for (off = PadnamelistMAX(PL_comppad_name); |
1604cfb0 MS |
1509 | off > PL_comppad_name_fill; off--) { |
1510 | PADNAME * const sv = svp[off]; | |
1511 | if (sv && PadnameLEN(sv) && !PadnameOUTER(sv) | |
1512 | && COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO) | |
1513 | { | |
1514 | COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax); | |
1515 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1516 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", | |
1517 | (long)off, PadnamePV(sv), | |
1518 | (unsigned long)COP_SEQ_RANGE_LOW(sv), | |
1519 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) | |
1520 | ); | |
1521 | if (!PadnameIsSTATE(sv) && !PadnameIsOUR(sv) | |
1522 | && *PadnamePV(sv) == '&' && PadnameLEN(sv) > 1) { | |
1523 | OP *kid = newOP(OP_INTROCV, 0); | |
1524 | kid->op_targ = off; | |
1525 | o = op_prepend_elem(OP_LINESEQ, kid, o); | |
1526 | } | |
1527 | } | |
dd2155a4 | 1528 | } |
953c8b80 | 1529 | COP_SEQMAX_INC; |
dd2155a4 | 1530 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
1604cfb0 | 1531 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
6d5c2147 | 1532 | return o; |
dd2155a4 DM |
1533 | } |
1534 | ||
dd2155a4 | 1535 | /* |
44170c9a | 1536 | =for apidoc pad_swipe |
dd2155a4 | 1537 | |
796b6530 | 1538 | Abandon the tmp in the current pad at offset C<po> and replace with a |
dd2155a4 DM |
1539 | new one. |
1540 | ||
1541 | =cut | |
1542 | */ | |
1543 | ||
1544 | void | |
1545 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) | |
1546 | { | |
f3548bdc | 1547 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
dd2155a4 | 1548 | if (!PL_curpad) |
1604cfb0 | 1549 | return; |
dd2155a4 | 1550 | if (AvARRAY(PL_comppad) != PL_curpad) |
1604cfb0 MS |
1551 | Perl_croak(aTHX_ "panic: pad_swipe curpad, %p!=%p", |
1552 | AvARRAY(PL_comppad), PL_curpad); | |
9100eeb1 | 1553 | if (!po || ((SSize_t)po) > AvFILLp(PL_comppad)) |
1604cfb0 MS |
1554 | Perl_croak(aTHX_ "panic: pad_swipe po=%ld, fill=%ld", |
1555 | (long)po, (long)AvFILLp(PL_comppad)); | |
dd2155a4 DM |
1556 | |
1557 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1604cfb0 MS |
1558 | "Pad 0x%" UVxf "[0x%" UVxf "] swipe: %ld\n", |
1559 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); | |
dd2155a4 | 1560 | |
dd2155a4 | 1561 | if (refadjust) |
1604cfb0 | 1562 | SvREFCNT_dec(PL_curpad[po]); |
dd2155a4 | 1563 | |
9ad9869c DM |
1564 | |
1565 | /* if pad tmps aren't shared between ops, then there's no need to | |
1566 | * create a new tmp when an existing op is freed */ | |
53de1311 | 1567 | #ifdef USE_PAD_RESET |
8fcb2425 | 1568 | PL_curpad[po] = newSV_type(SVt_NULL); |
dd2155a4 | 1569 | SvPADTMP_on(PL_curpad[po]); |
9ad9869c | 1570 | #else |
ce0d59fd | 1571 | PL_curpad[po] = NULL; |
97bf4a8d | 1572 | #endif |
325e1816 | 1573 | if (PadnamelistMAX(PL_comppad_name) != -1 |
4891fdfa | 1574 | && (PADOFFSET)PadnamelistMAX(PL_comppad_name) >= po) { |
1604cfb0 MS |
1575 | if (PadnamelistARRAY(PL_comppad_name)[po]) { |
1576 | assert(!PadnameLEN(PadnamelistARRAY(PL_comppad_name)[po])); | |
1577 | } | |
1578 | PadnamelistARRAY(PL_comppad_name)[po] = &PL_padname_undef; | |
325e1816 | 1579 | } |
b54c5e14 FC |
1580 | /* Use PL_constpadix here, not PL_padix. The latter may have been |
1581 | reset by pad_reset. We don’t want pad_alloc to have to scan the | |
1582 | whole pad when allocating a constant. */ | |
d12be05d | 1583 | if (po < PL_constpadix) |
1604cfb0 | 1584 | PL_constpadix = po - 1; |
dd2155a4 DM |
1585 | } |
1586 | ||
dd2155a4 | 1587 | /* |
44170c9a | 1588 | =for apidoc pad_reset |
dd2155a4 DM |
1589 | |
1590 | Mark all the current temporaries for reuse | |
1591 | ||
1592 | =cut | |
1593 | */ | |
1594 | ||
1780e744 FC |
1595 | /* pad_reset() causes pad temp TARGs (operator targets) to be shared |
1596 | * between OPs from different statements. During compilation, at the start | |
1597 | * of each statement pad_reset resets PL_padix back to its previous value. | |
1598 | * When allocating a target, pad_alloc begins its scan through the pad at | |
1599 | * PL_padix+1. */ | |
1f676739 | 1600 | static void |
82af08ae | 1601 | S_pad_reset(pTHX) |
dd2155a4 | 1602 | { |
53de1311 | 1603 | #ifdef USE_PAD_RESET |
dd2155a4 | 1604 | if (AvARRAY(PL_comppad) != PL_curpad) |
1604cfb0 MS |
1605 | Perl_croak(aTHX_ "panic: pad_reset curpad, %p!=%p", |
1606 | AvARRAY(PL_comppad), PL_curpad); | |
dd2155a4 DM |
1607 | |
1608 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1604cfb0 MS |
1609 | "Pad 0x%" UVxf "[0x%" UVxf "] reset: padix %ld -> %ld", |
1610 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), | |
1611 | (long)PL_padix, (long)PL_padix_floor | |
1612 | ) | |
dd2155a4 DM |
1613 | ); |
1614 | ||
284167a5 | 1615 | if (!TAINTING_get) { /* Can't mix tainted and non-tainted temporaries. */ |
1604cfb0 | 1616 | PL_padix = PL_padix_floor; |
dd2155a4 DM |
1617 | } |
1618 | #endif | |
1619 | PL_pad_reset_pending = FALSE; | |
1620 | } | |
1621 | ||
dd2155a4 | 1622 | /* |
44170c9a | 1623 | =for apidoc pad_tidy |
cc76b5cc Z |
1624 | |
1625 | Tidy up a pad at the end of compilation of the code to which it belongs. | |
1626 | Jobs performed here are: remove most stuff from the pads of anonsub | |
796b6530 | 1627 | prototypes; give it a C<@_>; mark temporaries as such. C<type> indicates |
cc76b5cc | 1628 | the kind of subroutine: |
dd2155a4 | 1629 | |
cc76b5cc Z |
1630 | padtidy_SUB ordinary subroutine |
1631 | padtidy_SUBCLONE prototype for lexical closure | |
1632 | padtidy_FORMAT format | |
dd2155a4 DM |
1633 | |
1634 | =cut | |
1635 | */ | |
1636 | ||
dd2155a4 DM |
1637 | void |
1638 | Perl_pad_tidy(pTHX_ padtidy_type type) | |
1639 | { | |
dd2155a4 | 1640 | |
f3548bdc | 1641 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
b5c19bd7 | 1642 | |
db21619c DM |
1643 | /* If this CV has had any 'eval-capable' ops planted in it: |
1644 | * i.e. it contains any of: | |
1645 | * | |
1646 | * * eval '...', | |
1647 | * * //ee, | |
1648 | * * use re 'eval'; /$var/ | |
1649 | * * /(?{..})/), | |
1650 | * | |
1651 | * Then any anon prototypes in the chain of CVs should be marked as | |
1652 | * cloneable, so that for example the eval's CV in | |
1653 | * | |
1654 | * sub { eval '$x' } | |
1655 | * | |
1656 | * gets the right CvOUTSIDE. If running with -d, *any* sub may | |
1657 | * potentially have an eval executed within it. | |
b5c19bd7 DM |
1658 | */ |
1659 | ||
1660 | if (PL_cv_has_eval || PL_perldb) { | |
e1ec3a88 | 1661 | const CV *cv; |
1604cfb0 MS |
1662 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
1663 | if (cv != PL_compcv && CvCOMPILED(cv)) | |
1664 | break; /* no need to mark already-compiled code */ | |
1665 | if (CvANON(cv)) { | |
1666 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, | |
1667 | "Pad clone on cv=0x%" UVxf "\n", PTR2UV(cv))); | |
1668 | CvCLONE_on(cv); | |
1669 | } | |
1670 | CvHASEVAL_on(cv); | |
1671 | } | |
b5c19bd7 DM |
1672 | } |
1673 | ||
eb8137a9 | 1674 | /* extend namepad to match curpad */ |
9b7476d7 | 1675 | if (PadnamelistMAX(PL_comppad_name) < AvFILLp(PL_comppad)) |
1604cfb0 | 1676 | padnamelist_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
dd2155a4 DM |
1677 | |
1678 | if (type == padtidy_SUBCLONE) { | |
1604cfb0 MS |
1679 | PADNAME ** const namep = PadnamelistARRAY(PL_comppad_name); |
1680 | PADOFFSET ix; | |
1681 | ||
1682 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1683 | PADNAME *namesv; | |
1684 | if (!namep[ix]) namep[ix] = &PL_padname_undef; | |
1685 | ||
1686 | /* | |
1687 | * The only things that a clonable function needs in its | |
1688 | * pad are anonymous subs, constants and GVs. | |
1689 | * The rest are created anew during cloning. | |
1690 | */ | |
1691 | if (!PL_curpad[ix] || SvIMMORTAL(PL_curpad[ix])) | |
1692 | continue; | |
1693 | namesv = namep[ix]; | |
1694 | if (!(PadnamePV(namesv) && | |
1695 | (!PadnameLEN(namesv) || *PadnamePV(namesv) == '&'))) | |
1696 | { | |
1697 | SvREFCNT_dec(PL_curpad[ix]); | |
1698 | PL_curpad[ix] = NULL; | |
1699 | } | |
1700 | } | |
dd2155a4 DM |
1701 | } |
1702 | else if (type == padtidy_SUB) { | |
1604cfb0 MS |
1703 | AV * const av = newAV(); /* Will be @_ */ |
1704 | av_store(PL_comppad, 0, MUTABLE_SV(av)); | |
1705 | AvREIFY_only(av); | |
dd2155a4 DM |
1706 | } |
1707 | ||
4cee4ca8 | 1708 | if (type == padtidy_SUB || type == padtidy_FORMAT) { |
1604cfb0 MS |
1709 | PADNAME ** const namep = PadnamelistARRAY(PL_comppad_name); |
1710 | PADOFFSET ix; | |
1711 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { | |
1712 | if (!namep[ix]) namep[ix] = &PL_padname_undef; | |
1713 | if (!PL_curpad[ix] || SvIMMORTAL(PL_curpad[ix])) | |
1714 | continue; | |
1715 | if (SvPADMY(PL_curpad[ix]) && !PadnameOUTER(namep[ix])) { | |
1716 | /* This is a work around for how the current implementation of | |
1717 | ?{ } blocks in regexps interacts with lexicals. | |
1718 | ||
1719 | One of our lexicals. | |
1720 | Can't do this on all lexicals, otherwise sub baz() won't | |
1721 | compile in | |
1722 | ||
1723 | my $foo; | |
1724 | ||
1725 | sub bar { ++$foo; } | |
1726 | ||
1727 | sub baz { ++$foo; } | |
1728 | ||
1729 | because completion of compiling &bar calling pad_tidy() | |
1730 | would cause (top level) $foo to be marked as stale, and | |
1731 | "no longer available". */ | |
1732 | SvPADSTALE_on(PL_curpad[ix]); | |
1733 | } | |
1734 | } | |
dd2155a4 | 1735 | } |
f3548bdc | 1736 | PL_curpad = AvARRAY(PL_comppad); |
dd2155a4 DM |
1737 | } |
1738 | ||
dd2155a4 | 1739 | /* |
44170c9a | 1740 | =for apidoc pad_free |
dd2155a4 | 1741 | |
8627550a | 1742 | Free the SV at offset po in the current pad. |
dd2155a4 DM |
1743 | |
1744 | =cut | |
1745 | */ | |
1746 | ||
dd2155a4 DM |
1747 | void |
1748 | Perl_pad_free(pTHX_ PADOFFSET po) | |
1749 | { | |
53de1311 | 1750 | #ifndef USE_PAD_RESET |
ad9e6ae1 | 1751 | SV *sv; |
ff06c6b2 | 1752 | #endif |
f3548bdc | 1753 | ASSERT_CURPAD_LEGAL("pad_free"); |
dd2155a4 | 1754 | if (!PL_curpad) |
1604cfb0 | 1755 | return; |
dd2155a4 | 1756 | if (AvARRAY(PL_comppad) != PL_curpad) |
1604cfb0 MS |
1757 | Perl_croak(aTHX_ "panic: pad_free curpad, %p!=%p", |
1758 | AvARRAY(PL_comppad), PL_curpad); | |
dd2155a4 | 1759 | if (!po) |
1604cfb0 | 1760 | Perl_croak(aTHX_ "panic: pad_free po"); |
dd2155a4 DM |
1761 | |
1762 | DEBUG_X(PerlIO_printf(Perl_debug_log, | |
1604cfb0 MS |
1763 | "Pad 0x%" UVxf "[0x%" UVxf "] free: %ld\n", |
1764 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) | |
dd2155a4 DM |
1765 | ); |
1766 | ||
53de1311 | 1767 | #ifndef USE_PAD_RESET |
ad9e6ae1 DM |
1768 | sv = PL_curpad[po]; |
1769 | if (sv && sv != &PL_sv_undef && !SvPADMY(sv)) | |
1604cfb0 | 1770 | SvFLAGS(sv) &= ~SVs_PADTMP; |
ad9e6ae1 | 1771 | |
d12be05d | 1772 | if (po < PL_padix) |
1604cfb0 | 1773 | PL_padix = po - 1; |
53d3c048 | 1774 | #endif |
dd2155a4 DM |
1775 | } |
1776 | ||
dd2155a4 | 1777 | /* |
44170c9a | 1778 | =for apidoc do_dump_pad |
dd2155a4 DM |
1779 | |
1780 | Dump the contents of a padlist | |
1781 | ||
1782 | =cut | |
1783 | */ | |
1784 | ||
1785 | void | |
1786 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) | |
1787 | { | |
9b7476d7 | 1788 | const PADNAMELIST *pad_name; |
e1ec3a88 | 1789 | const AV *pad; |
01326933 | 1790 | PADNAME **pname; |
dd2155a4 | 1791 | SV **ppad; |
d12be05d | 1792 | PADOFFSET ix; |
dd2155a4 | 1793 | |
7918f24d NC |
1794 | PERL_ARGS_ASSERT_DO_DUMP_PAD; |
1795 | ||
dd2155a4 | 1796 | if (!padlist) { |
1604cfb0 | 1797 | return; |
dd2155a4 | 1798 | } |
9b7476d7 | 1799 | pad_name = PadlistNAMES(padlist); |
86d2498c | 1800 | pad = PadlistARRAY(padlist)[1]; |
9b7476d7 | 1801 | pname = PadnamelistARRAY(pad_name); |
dd2155a4 DM |
1802 | ppad = AvARRAY(pad); |
1803 | Perl_dump_indent(aTHX_ level, file, | |
1604cfb0 MS |
1804 | "PADNAME = 0x%" UVxf "(0x%" UVxf ") PAD = 0x%" UVxf "(0x%" UVxf ")\n", |
1805 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) | |
dd2155a4 DM |
1806 | ); |
1807 | ||
9b7476d7 | 1808 | for (ix = 1; ix <= PadnamelistMAX(pad_name); ix++) { |
01326933 | 1809 | const PADNAME *namesv = pname[ix]; |
1604cfb0 MS |
1810 | if (namesv && !PadnameLEN(namesv)) { |
1811 | namesv = NULL; | |
1812 | } | |
1813 | if (namesv) { | |
1814 | if (PadnameOUTER(namesv)) | |
1815 | Perl_dump_indent(aTHX_ level+1, file, | |
1816 | "%2d. 0x%" UVxf "<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", | |
1817 | (int) ix, | |
1818 | PTR2UV(ppad[ix]), | |
1819 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
1820 | PadnamePV(namesv), | |
1821 | (unsigned long)PARENT_FAKELEX_FLAGS(namesv), | |
1822 | (unsigned long)PARENT_PAD_INDEX(namesv) | |
1823 | ||
1824 | ); | |
1825 | else | |
1826 | Perl_dump_indent(aTHX_ level+1, file, | |
1827 | "%2d. 0x%" UVxf "<%lu> (%lu,%lu) \"%s\"\n", | |
1828 | (int) ix, | |
1829 | PTR2UV(ppad[ix]), | |
1830 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), | |
1831 | (unsigned long)COP_SEQ_RANGE_LOW(namesv), | |
1832 | (unsigned long)COP_SEQ_RANGE_HIGH(namesv), | |
1833 | PadnamePV(namesv) | |
1834 | ); | |
1835 | } | |
1836 | else if (full) { | |
1837 | Perl_dump_indent(aTHX_ level+1, file, | |
1838 | "%2d. 0x%" UVxf "<%lu>\n", | |
1839 | (int) ix, | |
1840 | PTR2UV(ppad[ix]), | |
1841 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) | |
1842 | ); | |
1843 | } | |
dd2155a4 DM |
1844 | } |
1845 | } | |
1846 | ||
cc76b5cc | 1847 | #ifdef DEBUGGING |
dd2155a4 DM |
1848 | |
1849 | /* | |
44170c9a | 1850 | =for apidoc cv_dump |
dd2155a4 DM |
1851 | |
1852 | dump the contents of a CV | |
1853 | ||
1854 | =cut | |
1855 | */ | |
1856 | ||
dd2155a4 | 1857 | STATIC void |
e1ec3a88 | 1858 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
dd2155a4 | 1859 | { |
53c1dcc0 | 1860 | const CV * const outside = CvOUTSIDE(cv); |
dd2155a4 | 1861 | |
7918f24d NC |
1862 | PERL_ARGS_ASSERT_CV_DUMP; |
1863 | ||
dd2155a4 | 1864 | PerlIO_printf(Perl_debug_log, |
1604cfb0 MS |
1865 | " %s: CV=0x%" UVxf " (%s), OUTSIDE=0x%" UVxf " (%s)\n", |
1866 | title, | |
1867 | PTR2UV(cv), | |
1868 | (CvANON(cv) ? "ANON" | |
1869 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" | |
1870 | : (cv == PL_main_cv) ? "MAIN" | |
1871 | : CvUNIQUE(cv) ? "UNIQUE" | |
1872 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), | |
1873 | PTR2UV(outside), | |
1874 | (!outside ? "null" | |
1875 | : CvANON(outside) ? "ANON" | |
1876 | : (outside == PL_main_cv) ? "MAIN" | |
1877 | : CvUNIQUE(outside) ? "UNIQUE" | |
1878 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); | |
dd2155a4 | 1879 | |
277d63d6 YO |
1880 | if (!CvISXSUB(cv)) { |
1881 | /* SVPADLIST(cv) will fail an assert if CvISXSUB(cv) is true, | |
1882 | * and if the assert is removed this code will SEGV. XSUBs don't | |
1883 | * have padlists I believe - Yves */ | |
1884 | PADLIST* const padlist = CvPADLIST(cv); | |
1885 | PerlIO_printf(Perl_debug_log, | |
1604cfb0 | 1886 | " PADLIST = 0x%" UVxf "\n", PTR2UV(padlist)); |
277d63d6 YO |
1887 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
1888 | } | |
dd2155a4 | 1889 | } |
dd2155a4 | 1890 | |
cc76b5cc | 1891 | #endif /* DEBUGGING */ |
dd2155a4 DM |
1892 | |
1893 | /* | |
44170c9a | 1894 | =for apidoc cv_clone |
dd2155a4 | 1895 | |
2d7f6611 | 1896 | Clone a CV, making a lexical closure. C<proto> supplies the prototype |
cc76b5cc Z |
1897 | of the function: its code, pad structure, and other attributes. |
1898 | The prototype is combined with a capture of outer lexicals to which the | |
1899 | code refers, which are taken from the currently-executing instance of | |
1900 | the immediately surrounding code. | |
dd2155a4 DM |
1901 | |
1902 | =cut | |
1903 | */ | |
1904 | ||
e0c6a6b8 | 1905 | static CV *S_cv_clone(pTHX_ CV *proto, CV *cv, CV *outside, HV *cloned); |
e10681aa | 1906 | |
21195f4d | 1907 | static CV * |
e0c6a6b8 | 1908 | S_cv_clone_pad(pTHX_ CV *proto, CV *cv, CV *outside, HV *cloned, |
1604cfb0 | 1909 | bool newcv) |
dd2155a4 | 1910 | { |
d12be05d | 1911 | PADOFFSET ix; |
b70d5558 | 1912 | PADLIST* const protopadlist = CvPADLIST(proto); |
9b7476d7 | 1913 | PADNAMELIST *const protopad_name = PadlistNAMES(protopadlist); |
86d2498c | 1914 | const PAD *const protopad = PadlistARRAY(protopadlist)[1]; |
39899bf0 | 1915 | PADNAME** const pname = PadnamelistARRAY(protopad_name); |
53c1dcc0 | 1916 | SV** const ppad = AvARRAY(protopad); |
d12be05d DM |
1917 | const PADOFFSET fname = PadnamelistMAX(protopad_name); |
1918 | const PADOFFSET fpad = AvFILLp(protopad); | |
b5c19bd7 | 1919 | SV** outpad; |
71f882da | 1920 | long depth; |
e0c6a6b8 FC |
1921 | U32 subclones = 0; |
1922 | bool trouble = FALSE; | |
7918f24d | 1923 | |
dd2155a4 DM |
1924 | assert(!CvUNIQUE(proto)); |
1925 | ||
1b5aaca6 FC |
1926 | /* Anonymous subs have a weak CvOUTSIDE pointer, so its value is not |
1927 | * reliable. The currently-running sub is always the one we need to | |
1928 | * close over. | |
8d88fe29 FC |
1929 | * For my subs, the currently-running sub may not be the one we want. |
1930 | * We have to check whether it is a clone of CvOUTSIDE. | |
1b5aaca6 FC |
1931 | * Note that in general for formats, CvOUTSIDE != find_runcv. |
1932 | * Since formats may be nested inside closures, CvOUTSIDE may point | |
71f882da | 1933 | * to a prototype; we instead want the cloned parent who called us. |
af41786f | 1934 | */ |
71f882da | 1935 | |
e07561e6 | 1936 | if (!outside) { |
ebfebee4 | 1937 | if (CvWEAKOUTSIDE(proto)) |
1604cfb0 | 1938 | outside = find_runcv(NULL); |
e07561e6 | 1939 | else { |
1604cfb0 MS |
1940 | outside = CvOUTSIDE(proto); |
1941 | if ((CvCLONE(outside) && ! CvCLONED(outside)) | |
1942 | || !CvPADLIST(outside) | |
1943 | || CvPADLIST(outside)->xpadl_id != protopadlist->xpadl_outid) { | |
1944 | outside = find_runcv_where( | |
1945 | FIND_RUNCV_padid_eq, PTR2IV(protopadlist->xpadl_outid), NULL | |
1946 | ); | |
1947 | /* outside could be null */ | |
1948 | } | |
e07561e6 | 1949 | } |
5dff782d | 1950 | } |
db4cf31d | 1951 | depth = outside ? CvDEPTH(outside) : 0; |
71f882da | 1952 | if (!depth) |
1604cfb0 | 1953 | depth = 1; |
b5c19bd7 | 1954 | |
dd2155a4 DM |
1955 | ENTER; |
1956 | SAVESPTR(PL_compcv); | |
e07561e6 | 1957 | PL_compcv = cv; |
5fab0186 | 1958 | if (newcv) SAVEFREESV(cv); /* in case of fatal warnings */ |
dd2155a4 | 1959 | |
a0d2bbd5 | 1960 | if (CvHASEVAL(cv)) |
1604cfb0 | 1961 | CvOUTSIDE(cv) = MUTABLE_CV(SvREFCNT_inc_simple(outside)); |
dd2155a4 | 1962 | |
cbacc9aa | 1963 | SAVESPTR(PL_comppad_name); |
9ef8d569 | 1964 | PL_comppad_name = protopad_name; |
eacbb379 | 1965 | CvPADLIST_set(cv, pad_new(padnew_CLONE|padnew_SAVE)); |
b4db5868 | 1966 | CvPADLIST(cv)->xpadl_id = protopadlist->xpadl_id; |
dd2155a4 | 1967 | |
b5c19bd7 | 1968 | av_fill(PL_comppad, fpad); |
dd2155a4 | 1969 | |
dd2155a4 DM |
1970 | PL_curpad = AvARRAY(PL_comppad); |
1971 | ||
db4cf31d | 1972 | outpad = outside && CvPADLIST(outside) |
1604cfb0 MS |
1973 | ? AvARRAY(PadlistARRAY(CvPADLIST(outside))[depth]) |
1974 | : NULL; | |
b4db5868 | 1975 | if (outpad) CvPADLIST(cv)->xpadl_outid = CvPADLIST(outside)->xpadl_id; |
b5c19bd7 | 1976 | |
dd2155a4 | 1977 | for (ix = fpad; ix > 0; ix--) { |
1604cfb0 MS |
1978 | PADNAME* const namesv = (ix <= fname) ? pname[ix] : NULL; |
1979 | SV *sv = NULL; | |
1980 | if (namesv && PadnameLEN(namesv)) { /* lexical */ | |
1981 | if (PadnameIsOUR(namesv)) { /* or maybe not so lexical */ | |
1982 | NOOP; | |
1983 | } | |
1984 | else { | |
1985 | if (PadnameOUTER(namesv)) { /* lexical from outside? */ | |
1986 | /* formats may have an inactive, or even undefined, parent; | |
1987 | but state vars are always available. */ | |
1988 | if (!outpad || !(sv = outpad[PARENT_PAD_INDEX(namesv)]) | |
1989 | || ( SvPADSTALE(sv) && !SvPAD_STATE(namesv) | |
1990 | && (!outside || !CvDEPTH(outside))) ) { | |
1991 | S_unavailable(aTHX_ namesv); | |
1992 | sv = NULL; | |
1993 | } | |
1994 | else | |
1995 | SvREFCNT_inc_simple_void_NN(sv); | |
1996 | } | |
1997 | if (!sv) { | |
39899bf0 | 1998 | const char sigil = PadnamePV(namesv)[0]; |
e1ec3a88 | 1999 | if (sigil == '&') |
1604cfb0 MS |
2000 | /* If there are state subs, we need to clone them, too. |
2001 | But they may need to close over variables we have | |
2002 | not cloned yet. So we will have to do a second | |
2003 | pass. Furthermore, there may be state subs clos- | |
2004 | ing over other state subs’ entries, so we have | |
2005 | to put a stub here and then clone into it on the | |
2006 | second pass. */ | |
2007 | if (SvPAD_STATE(namesv) && !CvCLONED(ppad[ix])) { | |
2008 | assert(SvTYPE(ppad[ix]) == SVt_PVCV); | |
2009 | subclones ++; | |
2010 | if (CvOUTSIDE(ppad[ix]) != proto) | |
2011 | trouble = TRUE; | |
2012 | sv = newSV_type(SVt_PVCV); | |
2013 | CvLEXICAL_on(sv); | |
2014 | } | |
2015 | else if (PadnameLEN(namesv)>1 && !PadnameIsOUR(namesv)) | |
2016 | { | |
2017 | /* my sub */ | |
2018 | /* Just provide a stub, but name it. It will be | |
2019 | upgraded to the real thing on scope entry. */ | |
2020 | U32 hash; | |
2021 | PERL_HASH(hash, PadnamePV(namesv)+1, | |
2022 | PadnameLEN(namesv) - 1); | |
2023 | sv = newSV_type(SVt_PVCV); | |
2024 | CvNAME_HEK_set( | |
2025 | sv, | |
2026 | share_hek(PadnamePV(namesv)+1, | |
2027 | 1 - PadnameLEN(namesv), | |
2028 | hash) | |
2029 | ); | |
2030 | CvLEXICAL_on(sv); | |
2031 | } | |
2032 | else sv = SvREFCNT_inc(ppad[ix]); | |
e1ec3a88 | 2033 | else if (sigil == '@') |
1604cfb0 | 2034 | sv = MUTABLE_SV(newAV()); |
e1ec3a88 | 2035 | else if (sigil == '%') |
1604cfb0 MS |
2036 | sv = MUTABLE_SV(newHV()); |
2037 | else | |
8fcb2425 | 2038 | sv = newSV_type(SVt_NULL); |
1604cfb0 MS |
2039 | /* reset the 'assign only once' flag on each state var */ |
2040 | if (sigil != '&' && SvPAD_STATE(namesv)) | |
2041 | SvPADSTALE_on(sv); | |
2042 | } | |
2043 | } | |
2044 | } | |
2045 | else if (namesv && PadnamePV(namesv)) { | |
2046 | sv = SvREFCNT_inc_NN(ppad[ix]); | |
2047 | } | |
2048 | else { | |
8fcb2425 | 2049 | sv = newSV_type(SVt_NULL); |
1604cfb0 MS |
2050 | SvPADTMP_on(sv); |
2051 | } | |
2052 | PL_curpad[ix] = sv; | |
dd2155a4 DM |
2053 | } |
2054 | ||
e07561e6 | 2055 | if (subclones) |
e0c6a6b8 | 2056 | { |
1604cfb0 MS |
2057 | if (trouble || cloned) { |
2058 | /* Uh-oh, we have trouble! At least one of the state subs here | |
2059 | has its CvOUTSIDE pointer pointing somewhere unexpected. It | |
2060 | could be pointing to another state protosub that we are | |
2061 | about to clone. So we have to track which sub clones come | |
2062 | from which protosubs. If the CvOUTSIDE pointer for a parti- | |
2063 | cular sub points to something we have not cloned yet, we | |
2064 | delay cloning it. We must loop through the pad entries, | |
2065 | until we get a full pass with no cloning. If any uncloned | |
2066 | subs remain (probably nested inside anonymous or ‘my’ subs), | |
2067 | then they get cloned in a final pass. | |
2068 | */ | |
2069 | bool cloned_in_this_pass; | |
2070 | if (!cloned) | |
7ea8b04b | 2071 | cloned = (HV *)newSV_type_mortal(SVt_PVHV); |
1604cfb0 MS |
2072 | do { |
2073 | cloned_in_this_pass = FALSE; | |
2074 | for (ix = fpad; ix > 0; ix--) { | |
2075 | PADNAME * const name = | |
2076 | (ix <= fname) ? pname[ix] : NULL; | |
2077 | if (name && name != &PL_padname_undef | |
2078 | && !PadnameOUTER(name) && PadnamePV(name)[0] == '&' | |
2079 | && PadnameIsSTATE(name) && !CvCLONED(PL_curpad[ix])) | |
2080 | { | |
2081 | CV * const protokey = CvOUTSIDE(ppad[ix]); | |
2082 | CV ** const cvp = protokey == proto | |
2083 | ? &cv | |
2084 | : (CV **)hv_fetch(cloned, (char *)&protokey, | |
2085 | sizeof(CV *), 0); | |
2086 | if (cvp && *cvp) { | |
2087 | S_cv_clone(aTHX_ (CV *)ppad[ix], | |
2088 | (CV *)PL_curpad[ix], | |
2089 | *cvp, cloned); | |
2090 | (void)hv_store(cloned, (char *)&ppad[ix], | |
2091 | sizeof(CV *), | |
2092 | SvREFCNT_inc_simple_NN(PL_curpad[ix]), | |
2093 | 0); | |
2094 | subclones--; | |
2095 | cloned_in_this_pass = TRUE; | |
2096 | } | |
2097 | } | |
2098 | } | |
2099 | } while (cloned_in_this_pass); | |
2100 | if (subclones) | |
2101 | for (ix = fpad; ix > 0; ix--) { | |
2102 | PADNAME * const name = | |
2103 | (ix <= fname) ? pname[ix] : NULL; | |
2104 | if (name && name != &PL_padname_undef | |
2105 | && !PadnameOUTER(name) && PadnamePV(name)[0] == '&' | |
2106 | && PadnameIsSTATE(name) && !CvCLONED(PL_curpad[ix])) | |
2107 | S_cv_clone(aTHX_ (CV *)ppad[ix], | |
2108 | (CV *)PL_curpad[ix], | |
2109 | CvOUTSIDE(ppad[ix]), cloned); | |
2110 | } | |
2111 | } | |
2112 | else for (ix = fpad; ix > 0; ix--) { | |
2113 | PADNAME * const name = (ix <= fname) ? pname[ix] : NULL; | |
2114 | if (name && name != &PL_padname_undef && !PadnameOUTER(name) | |
2115 | && PadnamePV(name)[0] == '&' && PadnameIsSTATE(name)) | |
2116 | S_cv_clone(aTHX_ (CV *)ppad[ix], (CV *)PL_curpad[ix], cv, | |
2117 | NULL); | |
2118 | } | |
e0c6a6b8 | 2119 | } |
e07561e6 | 2120 | |
5fab0186 | 2121 | if (newcv) SvREFCNT_inc_simple_void_NN(cv); |
e10681aa | 2122 | LEAVE; |
21195f4d | 2123 | |
1567c65a | 2124 | if (CvCONST(cv)) { |
1604cfb0 MS |
2125 | /* Constant sub () { $x } closing over $x: |
2126 | * The prototype was marked as a candiate for const-ization, | |
2127 | * so try to grab the current const value, and if successful, | |
2128 | * turn into a const sub: | |
2129 | */ | |
2130 | SV* const_sv; | |
2131 | OP *o = CvSTART(cv); | |
2132 | assert(newcv); | |
2133 | for (; o; o = o->op_next) | |
2134 | if (o->op_type == OP_PADSV) | |
2135 | break; | |
2136 | ASSUME(o->op_type == OP_PADSV); | |
2137 | const_sv = PAD_BASE_SV(CvPADLIST(cv), o->op_targ); | |
2138 | /* the candidate should have 1 ref from this pad and 1 ref | |
2139 | * from the parent */ | |
2140 | if (const_sv && SvREFCNT(const_sv) == 2) { | |
2141 | const bool was_method = cBOOL(CvMETHOD(cv)); | |
2142 | if (outside) { | |
2143 | PADNAME * const pn = | |
2144 | PadlistNAMESARRAY(CvPADLIST(outside)) | |
2145 | [PARENT_PAD_INDEX(PadlistNAMESARRAY( | |
2146 | CvPADLIST(cv))[o->op_targ])]; | |
2147 | assert(PadnameOUTER(PadlistNAMESARRAY(CvPADLIST(cv)) | |
2148 | [o->op_targ])); | |
2149 | if (PadnameLVALUE(pn)) { | |
2150 | /* We have a lexical that is potentially modifiable | |
2151 | elsewhere, so making a constant will break clo- | |
2152 | sure behaviour. If this is a ‘simple lexical | |
2153 | op tree’, i.e., sub(){$x}, emit a deprecation | |
2154 | warning, but continue to exhibit the old behav- | |
2155 | iour of making it a constant based on the ref- | |
2156 | count of the candidate variable. | |
2157 | ||
2158 | A simple lexical op tree looks like this: | |
2159 | ||
2160 | leavesub | |
2161 | lineseq | |
2162 | nextstate | |
2163 | padsv | |
2164 | */ | |
2165 | if (OpSIBLING( | |
2166 | cUNOPx(cUNOPx(CvROOT(cv))->op_first)->op_first | |
2167 | ) == o | |
2168 | && !OpSIBLING(o)) | |
2169 | { | |
30fc7a28 JK |
2170 | Perl_croak(aTHX_ |
2171 | "Constants from lexical variables potentially modified " | |
2172 | "elsewhere are no longer permitted"); | |
1604cfb0 MS |
2173 | } |
2174 | else | |
2175 | goto constoff; | |
2176 | } | |
2177 | } | |
30fc7a28 | 2178 | SvREFCNT_inc_simple_void_NN(const_sv); |
1604cfb0 MS |
2179 | /* If the lexical is not used elsewhere, it is safe to turn on |
2180 | SvPADTMP, since it is only when it is used in lvalue con- | |
2181 | text that the difference is observable. */ | |
2182 | SvREADONLY_on(const_sv); | |
2183 | SvPADTMP_on(const_sv); | |
2184 | SvREFCNT_dec_NN(cv); | |
2185 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); | |
2186 | if (was_method) | |
2187 | CvMETHOD_on(cv); | |
2188 | } | |
2189 | else { | |
2190 | constoff: | |
2191 | CvCONST_off(cv); | |
2192 | } | |
1567c65a FC |
2193 | } |
2194 | ||
21195f4d | 2195 | return cv; |
e10681aa FC |
2196 | } |
2197 | ||
2198 | static CV * | |
e0c6a6b8 | 2199 | S_cv_clone(pTHX_ CV *proto, CV *cv, CV *outside, HV *cloned) |
e10681aa | 2200 | { |
5fab0186 | 2201 | const bool newcv = !cv; |
c04ef36e | 2202 | |
e10681aa FC |
2203 | assert(!CvUNIQUE(proto)); |
2204 | ||
2205 | if (!cv) cv = MUTABLE_CV(newSV_type(SvTYPE(proto))); | |
2206 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE|CVf_CVGV_RC | |
1604cfb0 | 2207 | |CVf_SLABBED); |
e10681aa FC |
2208 | CvCLONED_on(cv); |
2209 | ||
2210 | CvFILE(cv) = CvDYNFILE(proto) ? savepv(CvFILE(proto)) | |
1604cfb0 | 2211 | : CvFILE(proto); |
e10681aa | 2212 | if (CvNAMED(proto)) |
1604cfb0 | 2213 | CvNAME_HEK_set(cv, share_hek_hek(CvNAME_HEK(proto))); |
e10681aa FC |
2214 | else CvGV_set(cv,CvGV(proto)); |
2215 | CvSTASH_set(cv, CvSTASH(proto)); | |
6a2e756f PE |
2216 | |
2217 | /* It is unlikely that proto is an xsub, but it could happen; e.g. if a | |
2218 | * module has performed a lexical sub import trick on an xsub. This | |
2219 | * happens with builtin::import, for example | |
2220 | */ | |
2221 | if (UNLIKELY(CvISXSUB(proto))) { | |
2222 | CvXSUB(cv) = CvXSUB(proto); | |
2223 | CvXSUBANY(cv) = CvXSUBANY(proto); | |
2224 | } | |
2225 | else { | |
2226 | OP_REFCNT_LOCK; | |
2227 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); | |
2228 | OP_REFCNT_UNLOCK; | |
2229 | CvSTART(cv) = CvSTART(proto); | |
2230 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); | |
2231 | } | |
e10681aa | 2232 | |
fdf416b6 | 2233 | if (SvPOK(proto)) { |
1604cfb0 | 2234 | sv_setpvn(MUTABLE_SV(cv), SvPVX_const(proto), SvCUR(proto)); |
fdf416b6 BF |
2235 | if (SvUTF8(proto)) |
2236 | SvUTF8_on(MUTABLE_SV(cv)); | |
2237 | } | |
e10681aa | 2238 | if (SvMAGIC(proto)) |
1604cfb0 | 2239 | mg_copy((SV *)proto, (SV *)cv, 0, 0); |
e10681aa | 2240 | |
6a2e756f | 2241 | if (!CvISXSUB(proto) && CvPADLIST(proto)) |
1604cfb0 | 2242 | cv = S_cv_clone_pad(aTHX_ proto, cv, outside, cloned, newcv); |
e10681aa | 2243 | |
dd2155a4 | 2244 | DEBUG_Xv( |
1604cfb0 MS |
2245 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
2246 | if (CvOUTSIDE(cv)) cv_dump(CvOUTSIDE(cv), "Outside"); | |
2247 | cv_dump(proto, "Proto"); | |
2248 | cv_dump(cv, "To"); | |
dd2155a4 DM |
2249 | ); |
2250 | ||
dd2155a4 DM |
2251 | return cv; |
2252 | } | |
2253 | ||
e07561e6 FC |
2254 | CV * |
2255 | Perl_cv_clone(pTHX_ CV *proto) | |
2256 | { | |
2257 | PERL_ARGS_ASSERT_CV_CLONE; | |
2258 | ||
fead5351 | 2259 | if (!CvPADLIST(proto)) Perl_croak(aTHX_ "panic: no pad in cv_clone"); |
e0c6a6b8 | 2260 | return S_cv_clone(aTHX_ proto, NULL, NULL, NULL); |
e07561e6 FC |
2261 | } |
2262 | ||
6d5c2147 FC |
2263 | /* Called only by pp_clonecv */ |
2264 | CV * | |
2265 | Perl_cv_clone_into(pTHX_ CV *proto, CV *target) | |
2266 | { | |
2267 | PERL_ARGS_ASSERT_CV_CLONE_INTO; | |
2268 | cv_undef(target); | |
e0c6a6b8 | 2269 | return S_cv_clone(aTHX_ proto, target, NULL, NULL); |
6d5c2147 FC |
2270 | } |
2271 | ||
fb094047 FC |
2272 | /* |
2273 | =for apidoc cv_name | |
2274 | ||
2275 | Returns an SV containing the name of the CV, mainly for use in error | |
2276 | reporting. The CV may actually be a GV instead, in which case the returned | |
7a275a2e FC |
2277 | SV holds the GV's name. Anything other than a GV or CV is treated as a |
2278 | string already holding the sub name, but this could change in the future. | |
fb094047 FC |
2279 | |
2280 | An SV may be passed as a second argument. If so, the name will be assigned | |
2281 | to it and it will be returned. Otherwise the returned SV will be a new | |
2282 | mortal. | |
2283 | ||
c5608a1f | 2284 | If C<flags> has the C<CV_NAME_NOTQUAL> bit set, then the package name will not be |
ecf05a58 FC |
2285 | included. If the first argument is neither a CV nor a GV, this flag is |
2286 | ignored (subject to change). | |
2287 | ||
5af38e47 KW |
2288 | =for apidoc Amnh||CV_NAME_NOTQUAL |
2289 | ||
fb094047 FC |
2290 | =cut |
2291 | */ | |
2292 | ||
c5569a55 | 2293 | SV * |
ecf05a58 | 2294 | Perl_cv_name(pTHX_ CV *cv, SV *sv, U32 flags) |
c5569a55 FC |
2295 | { |
2296 | PERL_ARGS_ASSERT_CV_NAME; | |
2297 | if (!isGV_with_GP(cv) && SvTYPE(cv) != SVt_PVCV) { | |
1604cfb0 MS |
2298 | if (sv) sv_setsv(sv,(SV *)cv); |
2299 | return sv ? (sv) : (SV *)cv; | |
c5569a55 FC |
2300 | } |
2301 | { | |
1604cfb0 MS |
2302 | SV * const retsv = sv ? (sv) : sv_newmortal(); |
2303 | if (SvTYPE(cv) == SVt_PVCV) { | |
2304 | if (CvNAMED(cv)) { | |
2305 | if (CvLEXICAL(cv) || flags & CV_NAME_NOTQUAL) | |
2306 | sv_sethek(retsv, CvNAME_HEK(cv)); | |
2307 | else { | |
2308 | if (CvSTASH(cv) && HvNAME_HEK(CvSTASH(cv))) | |
2309 | sv_sethek(retsv, HvNAME_HEK(CvSTASH(cv))); | |
2310 | else | |
2311 | sv_setpvs(retsv, "__ANON__"); | |
2312 | sv_catpvs(retsv, "::"); | |
2313 | sv_cathek(retsv, CvNAME_HEK(cv)); | |
2314 | } | |
2315 | } | |
2316 | else if (CvLEXICAL(cv) || flags & CV_NAME_NOTQUAL) | |
2317 | sv_sethek(retsv, GvNAME_HEK(GvEGV(CvGV(cv)))); | |
2318 | else gv_efullname3(retsv, CvGV(cv), NULL); | |
2319 | } | |
2320 | else if (flags & CV_NAME_NOTQUAL) sv_sethek(retsv, GvNAME_HEK(cv)); | |
2321 | else gv_efullname3(retsv,(GV *)cv,NULL); | |
2322 | return retsv; | |
c5569a55 FC |
2323 | } |
2324 | } | |
2325 | ||
dd2155a4 | 2326 | /* |
44170c9a | 2327 | =for apidoc pad_fixup_inner_anons |
dd2155a4 | 2328 | |
796b6530 KW |
2329 | For any anon CVs in the pad, change C<CvOUTSIDE> of that CV from |
2330 | C<old_cv> to C<new_cv> if necessary. Needed when a newly-compiled CV has to be | |
7dafbf52 | 2331 | moved to a pre-existing CV struct. |
dd2155a4 DM |
2332 | |
2333 | =cut | |
2334 | */ | |
2335 | ||
2336 | void | |
2337 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) | |
2338 | { | |
d12be05d | 2339 | PADOFFSET ix; |
9b7476d7 | 2340 | PADNAMELIST * const comppad_name = PadlistNAMES(padlist); |
86d2498c | 2341 | AV * const comppad = PadlistARRAY(padlist)[1]; |
0f94cb1f | 2342 | PADNAME ** const namepad = PadnamelistARRAY(comppad_name); |
53c1dcc0 | 2343 | SV ** const curpad = AvARRAY(comppad); |
7918f24d NC |
2344 | |
2345 | PERL_ARGS_ASSERT_PAD_FIXUP_INNER_ANONS; | |
294a48e9 AL |
2346 | PERL_UNUSED_ARG(old_cv); |
2347 | ||
9b7476d7 | 2348 | for (ix = PadnamelistMAX(comppad_name); ix > 0; ix--) { |
307cbb9f | 2349 | const PADNAME *name = namepad[ix]; |
1604cfb0 MS |
2350 | if (name && name != &PL_padname_undef && !PadnameIsOUR(name) |
2351 | && *PadnamePV(name) == '&') | |
2352 | { | |
2353 | CV *innercv = MUTABLE_CV(curpad[ix]); | |
2354 | if (UNLIKELY(PadnameOUTER(name))) { | |
2355 | CV *cv = new_cv; | |
2356 | PADNAME **names = namepad; | |
2357 | PADOFFSET i = ix; | |
2358 | while (PadnameOUTER(name)) { | |
2359 | assert(SvTYPE(cv) == SVt_PVCV); | |
2360 | cv = CvOUTSIDE(cv); | |
2361 | names = PadlistNAMESARRAY(CvPADLIST(cv)); | |
2362 | i = PARENT_PAD_INDEX(name); | |
2363 | name = names[i]; | |
2364 | } | |
2365 | innercv = (CV *)PadARRAY(PadlistARRAY(CvPADLIST(cv))[1])[i]; | |
2366 | } | |
2367 | if (SvTYPE(innercv) == SVt_PVCV) { | |
2368 | /* XXX 0afba48f added code here to check for a proto CV | |
2369 | attached to the pad entry by magic. But shortly there- | |
2370 | after 81df9f6f95 moved the magic to the pad name. The | |
2371 | code here was never updated, so it wasn’t doing anything | |
2372 | and got deleted when PADNAME became a distinct type. Is | |
2373 | there any bug as a result? */ | |
2374 | if (CvOUTSIDE(innercv) == old_cv) { | |
2375 | if (!CvWEAKOUTSIDE(innercv)) { | |
2376 | SvREFCNT_dec(old_cv); | |
2377 | SvREFCNT_inc_simple_void_NN(new_cv); | |
2378 | } | |
2379 | CvOUTSIDE(innercv) = new_cv; | |
2380 | } | |
2381 | } | |
2382 | else { /* format reference */ | |
2383 | SV * const rv = curpad[ix]; | |
2384 | CV *innercv; | |
2385 | if (!SvOK(rv)) continue; | |
2386 | assert(SvROK(rv)); | |
2387 | assert(SvWEAKREF(rv)); | |
2388 | innercv = (CV *)SvRV(rv); | |
2389 | assert(!CvWEAKOUTSIDE(innercv)); | |
2390 | assert(CvOUTSIDE(innercv) == old_cv); | |
2391 | SvREFCNT_dec(CvOUTSIDE(innercv)); | |
2392 | CvOUTSIDE(innercv) = (CV *)SvREFCNT_inc_simple_NN(new_cv); | |
2393 | } | |
2394 | } | |
dd2155a4 DM |
2395 | } |
2396 | } | |
2397 | ||
2398 | /* | |
44170c9a | 2399 | =for apidoc pad_push |
dd2155a4 DM |
2400 | |
2401 | Push a new pad frame onto the padlist, unless there's already a pad at | |
26019298 | 2402 | this depth, in which case don't bother creating a new one. Then give |
796b6530 | 2403 | the new pad an C<@_> in slot zero. |
dd2155a4 DM |
2404 | |
2405 | =cut | |
2406 | */ | |
2407 | ||
2408 | void | |
26019298 | 2409 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
dd2155a4 | 2410 | { |
7918f24d NC |
2411 | PERL_ARGS_ASSERT_PAD_PUSH; |
2412 | ||
86d2498c | 2413 | if (depth > PadlistMAX(padlist) || !PadlistARRAY(padlist)[depth]) { |
1604cfb0 MS |
2414 | PAD** const svp = PadlistARRAY(padlist); |
2415 | AV* const newpad = newAV(); | |
2416 | SV** const oldpad = AvARRAY(svp[depth-1]); | |
2417 | PADOFFSET ix = AvFILLp((const AV *)svp[1]); | |
2418 | const PADOFFSET names_fill = PadnamelistMAX((PADNAMELIST *)svp[0]); | |
2419 | PADNAME ** const names = PadnamelistARRAY((PADNAMELIST *)svp[0]); | |
2420 | AV *av; | |
2421 | ||
e92b9ddc RL |
2422 | Newxz( AvALLOC(newpad), ix + 1, SV *); |
2423 | AvARRAY(newpad) = AvALLOC(newpad); | |
2424 | AvMAX(newpad) = AvFILLp(newpad) = ix; | |
2425 | ||
1604cfb0 | 2426 | for ( ;ix > 0; ix--) { |
a043512d | 2427 | SV *sv; |
1604cfb0 MS |
2428 | if (names_fill >= ix && PadnameLEN(names[ix])) { |
2429 | const char sigil = PadnamePV(names[ix])[0]; | |
2430 | if (PadnameOUTER(names[ix]) | |
2431 | || PadnameIsSTATE(names[ix]) | |
2432 | || sigil == '&') | |
2433 | { | |
2434 | /* outer lexical or anon code */ | |
a043512d | 2435 | sv = SvREFCNT_inc(oldpad[ix]); |
1604cfb0 MS |
2436 | } |
2437 | else { /* our own lexical */ | |
1604cfb0 MS |
2438 | if (sigil == '@') |
2439 | sv = MUTABLE_SV(newAV()); | |
2440 | else if (sigil == '%') | |
2441 | sv = MUTABLE_SV(newHV()); | |
2442 | else | |
8fcb2425 | 2443 | sv = newSV_type(SVt_NULL); |
1604cfb0 MS |
2444 | } |
2445 | } | |
2446 | else if (PadnamePV(names[ix])) { | |
a043512d | 2447 | sv = SvREFCNT_inc_NN(oldpad[ix]); |
1604cfb0 MS |
2448 | } |
2449 | else { | |
2450 | /* save temporaries on recursion? */ | |
8fcb2425 | 2451 | sv = newSV_type(SVt_NULL); |
1604cfb0 MS |
2452 | SvPADTMP_on(sv); |
2453 | } | |
e92b9ddc | 2454 | AvARRAY(newpad)[ix] = sv; |
1604cfb0 MS |
2455 | } |
2456 | av = newAV(); | |
e92b9ddc | 2457 | AvARRAY(newpad)[0] = MUTABLE_SV(av); |
1604cfb0 MS |
2458 | AvREIFY_only(av); |
2459 | ||
2460 | padlist_store(padlist, depth, newpad); | |
dd2155a4 DM |
2461 | } |
2462 | } | |
b21dc031 | 2463 | |
d5b1589c NC |
2464 | #if defined(USE_ITHREADS) |
2465 | ||
2466 | # define av_dup_inc(s,t) MUTABLE_AV(sv_dup_inc((const SV *)s,t)) | |
2467 | ||
cc76b5cc | 2468 | /* |
b70d5558 | 2469 | =for apidoc padlist_dup |
cc76b5cc Z |
2470 | |
2471 | Duplicates a pad. | |
2472 | ||
2473 | =cut | |
2474 | */ | |
2475 | ||
b70d5558 FC |
2476 | PADLIST * |
2477 | Perl_padlist_dup(pTHX_ PADLIST *srcpad, CLONE_PARAMS *param) | |
d5b1589c | 2478 | { |
7261499d FC |
2479 | PADLIST *dstpad; |
2480 | bool cloneall; | |
2481 | PADOFFSET max; | |
2482 | ||
d5b1589c NC |
2483 | PERL_ARGS_ASSERT_PADLIST_DUP; |
2484 | ||
71c165d4 | 2485 | cloneall = cBOOL(param->flags & CLONEf_COPY_STACKS); |
86d2498c | 2486 | assert (SvREFCNT(PadlistARRAY(srcpad)[1]) == 1); |
7261499d | 2487 | |
86d2498c | 2488 | max = cloneall ? PadlistMAX(srcpad) : 1; |
7261499d FC |
2489 | |
2490 | Newx(dstpad, 1, PADLIST); | |
2491 | ptr_table_store(PL_ptr_table, srcpad, dstpad); | |
86d2498c FC |
2492 | PadlistMAX(dstpad) = max; |
2493 | Newx(PadlistARRAY(dstpad), max + 1, PAD *); | |
7261499d | 2494 | |
9b7476d7 | 2495 | PadlistARRAY(dstpad)[0] = (PAD *) |
1604cfb0 | 2496 | padnamelist_dup(PadlistNAMES(srcpad), param); |
9b7476d7 | 2497 | PadnamelistREFCNT(PadlistNAMES(dstpad))++; |
7261499d | 2498 | if (cloneall) { |
1604cfb0 MS |
2499 | PADOFFSET depth; |
2500 | for (depth = 1; depth <= max; ++depth) | |
2501 | PadlistARRAY(dstpad)[depth] = | |
2502 | av_dup_inc(PadlistARRAY(srcpad)[depth], param); | |
6de654a5 | 2503 | } else { |
1604cfb0 MS |
2504 | /* CvDEPTH() on our subroutine will be set to 0, so there's no need |
2505 | to build anything other than the first level of pads. */ | |
2506 | PADOFFSET ix = AvFILLp(PadlistARRAY(srcpad)[1]); | |
2507 | AV *pad1; | |
2508 | const PADOFFSET names_fill = PadnamelistMAX(PadlistNAMES(srcpad)); | |
2509 | const PAD *const srcpad1 = PadlistARRAY(srcpad)[1]; | |
2510 | SV **oldpad = AvARRAY(srcpad1); | |
2511 | PADNAME ** const names = PadnamelistARRAY(PadlistNAMES(dstpad)); | |
2512 | SV **pad1a; | |
2513 | AV *args; | |
2514 | ||
2515 | pad1 = newAV(); | |
2516 | ||
2517 | av_extend(pad1, ix); | |
2518 | PadlistARRAY(dstpad)[1] = pad1; | |
2519 | pad1a = AvARRAY(pad1); | |
2520 | ||
2521 | if (ix > -1) { | |
2522 | AvFILLp(pad1) = ix; | |
2523 | ||
2524 | for ( ;ix > 0; ix--) { | |
2525 | if (!oldpad[ix]) { | |
2526 | pad1a[ix] = NULL; | |
2527 | } else if (names_fill >= ix && names[ix] && | |
2528 | PadnameLEN(names[ix])) { | |
2529 | const char sigil = PadnamePV(names[ix])[0]; | |
2530 | if (PadnameOUTER(names[ix]) | |
2531 | || PadnameIsSTATE(names[ix]) | |
2532 | || sigil == '&') | |
2533 | { | |
2534 | /* outer lexical or anon code */ | |
2535 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); | |
2536 | } | |
2537 | else { /* our own lexical */ | |
2538 | if(SvPADSTALE(oldpad[ix]) && SvREFCNT(oldpad[ix]) > 1) { | |
2539 | /* This is a work around for how the current | |
2540 | implementation of ?{ } blocks in regexps | |
2541 | interacts with lexicals. */ | |
2542 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); | |
2543 | } else { | |
2544 | SV *sv; | |
2545 | ||
2546 | if (sigil == '@') | |
2547 | sv = MUTABLE_SV(newAV()); | |
2548 | else if (sigil == '%') | |
2549 | sv = MUTABLE_SV(newHV()); | |
2550 | else | |
8fcb2425 | 2551 | sv = newSV_type(SVt_NULL); |
1604cfb0 MS |
2552 | pad1a[ix] = sv; |
2553 | } | |
2554 | } | |
2555 | } | |
2556 | else if (( names_fill >= ix && names[ix] | |
2557 | && PadnamePV(names[ix]) )) { | |
2558 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); | |
2559 | } | |
2560 | else { | |
2561 | /* save temporaries on recursion? */ | |
8fcb2425 | 2562 | SV * const sv = newSV_type(SVt_NULL); |
1604cfb0 MS |
2563 | pad1a[ix] = sv; |
2564 | ||
2565 | /* SvREFCNT(oldpad[ix]) != 1 for some code in threads.xs | |
2566 | FIXTHAT before merging this branch. | |
2567 | (And I know how to) */ | |
2568 | if (SvPADTMP(oldpad[ix])) | |
2569 | SvPADTMP_on(sv); | |
2570 | } | |
2571 | } | |
2572 | ||
2573 | if (oldpad[0]) { | |
2574 | args = newAV(); /* Will be @_ */ | |
2575 | AvREIFY_only(args); | |
2576 | pad1a[0] = (SV *)args; | |
2577 | } | |
2578 | } | |
6de654a5 | 2579 | } |
d5b1589c NC |
2580 | |
2581 | return dstpad; | |
2582 | } | |
2583 | ||
cc76b5cc | 2584 | #endif /* USE_ITHREADS */ |
d5b1589c | 2585 | |
7261499d | 2586 | PAD ** |
5aaab254 | 2587 | Perl_padlist_store(pTHX_ PADLIST *padlist, I32 key, PAD *val) |
7261499d | 2588 | { |
7261499d | 2589 | PAD **ary; |
86d2498c | 2590 | SSize_t const oldmax = PadlistMAX(padlist); |
7261499d FC |
2591 | |
2592 | PERL_ARGS_ASSERT_PADLIST_STORE; | |
2593 | ||
2594 | assert(key >= 0); | |
2595 | ||
86d2498c | 2596 | if (key > PadlistMAX(padlist)) { |
1604cfb0 MS |
2597 | av_extend_guts(NULL,key,&PadlistMAX(padlist), |
2598 | (SV ***)&PadlistARRAY(padlist), | |
2599 | (SV ***)&PadlistARRAY(padlist)); | |
2600 | Zero(PadlistARRAY(padlist)+oldmax+1, PadlistMAX(padlist)-oldmax, | |
2601 | PAD *); | |
7261499d | 2602 | } |
86d2498c | 2603 | ary = PadlistARRAY(padlist); |
7261499d FC |
2604 | SvREFCNT_dec(ary[key]); |
2605 | ary[key] = val; | |
2606 | return &ary[key]; | |
2607 | } | |
2608 | ||
66610fdd | 2609 | /* |
9b7476d7 FC |
2610 | =for apidoc newPADNAMELIST |
2611 | ||
2612 | Creates a new pad name list. C<max> is the highest index for which space | |
2613 | is allocated. | |
2614 | ||
2615 | =cut | |
2616 | */ | |
2617 | ||
2618 | PADNAMELIST * | |
a0e9f837 | 2619 | Perl_newPADNAMELIST(size_t max) |
9b7476d7 FC |
2620 | { |
2621 | PADNAMELIST *pnl; | |
2622 | Newx(pnl, 1, PADNAMELIST); | |
2623 | Newxz(PadnamelistARRAY(pnl), max+1, PADNAME *); | |
2624 | PadnamelistMAX(pnl) = -1; | |
2625 | PadnamelistREFCNT(pnl) = 1; | |
2626 | PadnamelistMAXNAMED(pnl) = 0; | |
2627 | pnl->xpadnl_max = max; | |
2628 | return pnl; | |
2629 | } | |
2630 | ||
2631 | /* | |
2632 | =for apidoc padnamelist_store | |
2633 | ||
2634 | Stores the pad name (which may be null) at the given index, freeing any | |
2635 | existing pad name in that slot. | |
2636 | ||
2637 | =cut | |
2638 | */ | |
2639 | ||
2640 | PADNAME ** | |
2641 | Perl_padnamelist_store(pTHX_ PADNAMELIST *pnl, SSize_t key, PADNAME *val) | |
2642 | { | |
2643 | PADNAME **ary; | |
2644 | ||
2645 | PERL_ARGS_ASSERT_PADNAMELIST_STORE; | |
2646 | ||
2647 | assert(key >= 0); | |
2648 | ||
2649 | if (key > pnl->xpadnl_max) | |
1604cfb0 MS |
2650 | av_extend_guts(NULL,key,&pnl->xpadnl_max, |
2651 | (SV ***)&PadnamelistARRAY(pnl), | |
2652 | (SV ***)&PadnamelistARRAY(pnl)); | |
9b7476d7 | 2653 | if (PadnamelistMAX(pnl) < key) { |
1604cfb0 MS |
2654 | Zero(PadnamelistARRAY(pnl)+PadnamelistMAX(pnl)+1, |
2655 | key-PadnamelistMAX(pnl), PADNAME *); | |
2656 | PadnamelistMAX(pnl) = key; | |
9b7476d7 FC |
2657 | } |
2658 | ary = PadnamelistARRAY(pnl); | |
0f94cb1f | 2659 | if (ary[key]) |
1604cfb0 | 2660 | PadnameREFCNT_dec(ary[key]); |
9b7476d7 FC |
2661 | ary[key] = val; |
2662 | return &ary[key]; | |
2663 | } | |
2664 | ||
2665 | /* | |
2666 | =for apidoc padnamelist_fetch | |
2667 | ||
2668 | Fetches the pad name from the given index. | |
2669 | ||
2670 | =cut | |
2671 | */ | |
2672 | ||
2673 | PADNAME * | |
a0e9f837 | 2674 | Perl_padnamelist_fetch(PADNAMELIST *pnl, SSize_t key) |
9b7476d7 FC |
2675 | { |
2676 | PERL_ARGS_ASSERT_PADNAMELIST_FETCH; | |
2677 | ASSUME(key >= 0); | |
2678 | ||
2679 | return key > PadnamelistMAX(pnl) ? NULL : PadnamelistARRAY(pnl)[key]; | |
2680 | } | |
2681 | ||
2682 | void | |
2683 | Perl_padnamelist_free(pTHX_ PADNAMELIST *pnl) | |
2684 | { | |
2685 | PERL_ARGS_ASSERT_PADNAMELIST_FREE; | |
2686 | if (!--PadnamelistREFCNT(pnl)) { | |
1604cfb0 MS |
2687 | while(PadnamelistMAX(pnl) >= 0) |
2688 | { | |
2689 | PADNAME * const pn = | |
2690 | PadnamelistARRAY(pnl)[PadnamelistMAX(pnl)--]; | |
2691 | if (pn) | |
2692 | PadnameREFCNT_dec(pn); | |
2693 | } | |
2694 | Safefree(PadnamelistARRAY(pnl)); | |
2695 | Safefree(pnl); | |
9b7476d7 FC |
2696 | } |
2697 | } | |
2698 | ||
2699 | #if defined(USE_ITHREADS) | |
2700 | ||
2701 | /* | |
2702 | =for apidoc padnamelist_dup | |
2703 | ||
2704 | Duplicates a pad name list. | |
2705 | ||
2706 | =cut | |
2707 | */ | |
2708 | ||
2709 | PADNAMELIST * | |
2710 | Perl_padnamelist_dup(pTHX_ PADNAMELIST *srcpad, CLONE_PARAMS *param) | |
2711 | { | |
2712 | PADNAMELIST *dstpad; | |
2713 | SSize_t max = PadnamelistMAX(srcpad); | |
2714 | ||
2715 | PERL_ARGS_ASSERT_PADNAMELIST_DUP; | |
2716 | ||
2717 | /* look for it in the table first */ | |
2718 | dstpad = (PADNAMELIST *)ptr_table_fetch(PL_ptr_table, srcpad); | |
2719 | if (dstpad) | |
1604cfb0 | 2720 | return dstpad; |
9b7476d7 FC |
2721 | |
2722 | dstpad = newPADNAMELIST(max); | |
2723 | PadnamelistREFCNT(dstpad) = 0; /* The caller will increment it. */ | |
2724 | PadnamelistMAXNAMED(dstpad) = PadnamelistMAXNAMED(srcpad); | |
2725 | PadnamelistMAX(dstpad) = max; | |
2726 | ||
2727 | ptr_table_store(PL_ptr_table, srcpad, dstpad); | |
2728 | for (; max >= 0; max--) | |
0f94cb1f | 2729 | if (PadnamelistARRAY(srcpad)[max]) { |
1604cfb0 MS |
2730 | PadnamelistARRAY(dstpad)[max] = |
2731 | padname_dup(PadnamelistARRAY(srcpad)[max], param); | |
2732 | PadnameREFCNT(PadnamelistARRAY(dstpad)[max])++; | |
0f94cb1f | 2733 | } |
9b7476d7 FC |
2734 | |
2735 | return dstpad; | |
2736 | } | |
2737 | ||
2738 | #endif /* USE_ITHREADS */ | |
2739 | ||
0f94cb1f FC |
2740 | /* |
2741 | =for apidoc newPADNAMEpvn | |
2742 | ||
4a4088c4 | 2743 | Constructs and returns a new pad name. C<s> must be a UTF-8 string. Do not |
0f94cb1f | 2744 | use this for pad names that point to outer lexicals. See |
fbe13c60 | 2745 | C<L</newPADNAMEouter>>. |
0f94cb1f FC |
2746 | |
2747 | =cut | |
2748 | */ | |
2749 | ||
2750 | PADNAME * | |
a0e9f837 | 2751 | Perl_newPADNAMEpvn(const char *s, STRLEN len) |
0f94cb1f FC |
2752 | { |
2753 | struct padname_with_str *alloc; | |
2754 | char *alloc2; /* for Newxz */ | |
2755 | PADNAME *pn; | |
2756 | PERL_ARGS_ASSERT_NEWPADNAMEPVN; | |
2757 | Newxz(alloc2, | |
1604cfb0 MS |
2758 | STRUCT_OFFSET(struct padname_with_str, xpadn_str[0]) + len + 1, |
2759 | char); | |
0f94cb1f FC |
2760 | alloc = (struct padname_with_str *)alloc2; |
2761 | pn = (PADNAME *)alloc; | |
2762 | PadnameREFCNT(pn) = 1; | |
2763 | PadnamePV(pn) = alloc->xpadn_str; | |
2764 | Copy(s, PadnamePV(pn), len, char); | |
2765 | *(PadnamePV(pn) + len) = '\0'; | |
2766 | PadnameLEN(pn) = len; | |
2767 | return pn; | |
2768 | } | |
2769 | ||
2770 | /* | |
2771 | =for apidoc newPADNAMEouter | |
2772 | ||
2773 | Constructs and returns a new pad name. Only use this function for names | |
2d7f6611 | 2774 | that refer to outer lexicals. (See also L</newPADNAMEpvn>.) C<outer> is |
0f94cb1f | 2775 | the outer pad name that this one mirrors. The returned pad name has the |
796b6530 | 2776 | C<PADNAMEt_OUTER> flag already set. |
0f94cb1f | 2777 | |
5af38e47 KW |
2778 | =for apidoc Amnh||PADNAMEt_OUTER |
2779 | ||
0f94cb1f FC |
2780 | =cut |
2781 | */ | |
2782 | ||
2783 | PADNAME * | |
a0e9f837 | 2784 | Perl_newPADNAMEouter(PADNAME *outer) |
0f94cb1f FC |
2785 | { |
2786 | PADNAME *pn; | |
2787 | PERL_ARGS_ASSERT_NEWPADNAMEOUTER; | |
2788 | Newxz(pn, 1, PADNAME); | |
2789 | PadnameREFCNT(pn) = 1; | |
2790 | PadnamePV(pn) = PadnamePV(outer); | |
2791 | /* Not PadnameREFCNT(outer), because ‘outer’ may itself close over | |
2792 | another entry. The original pad name owns the buffer. */ | |
2793 | PadnameREFCNT(PADNAME_FROM_PV(PadnamePV(outer)))++; | |
2794 | PadnameFLAGS(pn) = PADNAMEt_OUTER; | |
2795 | PadnameLEN(pn) = PadnameLEN(outer); | |
2796 | return pn; | |
2797 | } | |
2798 | ||
2799 | void | |
2800 | Perl_padname_free(pTHX_ PADNAME *pn) | |
2801 | { | |
2802 | PERL_ARGS_ASSERT_PADNAME_FREE; | |
2803 | if (!--PadnameREFCNT(pn)) { | |
1604cfb0 MS |
2804 | if (UNLIKELY(pn == &PL_padname_undef || pn == &PL_padname_const)) { |
2805 | PadnameREFCNT(pn) = SvREFCNT_IMMORTAL; | |
2806 | return; | |
2807 | } | |
2808 | SvREFCNT_dec(PadnameTYPE(pn)); /* Takes care of protocv, too. */ | |
2809 | SvREFCNT_dec(PadnameOURSTASH(pn)); | |
2810 | if (PadnameOUTER(pn)) | |
2811 | PadnameREFCNT_dec(PADNAME_FROM_PV(PadnamePV(pn))); | |
2812 | Safefree(pn); | |
0f94cb1f FC |
2813 | } |
2814 | } | |
2815 | ||
2816 | #if defined(USE_ITHREADS) | |
2817 | ||
2818 | /* | |
2819 | =for apidoc padname_dup | |
2820 | ||
2821 | Duplicates a pad name. | |
2822 | ||
2823 | =cut | |
2824 | */ | |
2825 | ||
2826 | PADNAME * | |
2827 | Perl_padname_dup(pTHX_ PADNAME *src, CLONE_PARAMS *param) | |
2828 | { | |
2829 | PADNAME *dst; | |
2830 | ||
2831 | PERL_ARGS_ASSERT_PADNAME_DUP; | |
2832 | ||
2833 | /* look for it in the table first */ | |
2834 | dst = (PADNAME *)ptr_table_fetch(PL_ptr_table, src); | |
2835 | if (dst) | |
1604cfb0 | 2836 | return dst; |
0f94cb1f FC |
2837 | |
2838 | if (!PadnamePV(src)) { | |
1604cfb0 MS |
2839 | dst = &PL_padname_undef; |
2840 | ptr_table_store(PL_ptr_table, src, dst); | |
2841 | return dst; | |
0f94cb1f FC |
2842 | } |
2843 | ||
2844 | dst = PadnameOUTER(src) | |
2845 | ? newPADNAMEouter(padname_dup(PADNAME_FROM_PV(PadnamePV(src)), param)) | |
2846 | : newPADNAMEpvn(PadnamePV(src), PadnameLEN(src)); | |
2847 | ptr_table_store(PL_ptr_table, src, dst); | |
2848 | PadnameLEN(dst) = PadnameLEN(src); | |
2849 | PadnameFLAGS(dst) = PadnameFLAGS(src); | |
2850 | PadnameREFCNT(dst) = 0; /* The caller will increment it. */ | |
2851 | PadnameTYPE (dst) = (HV *)sv_dup_inc((SV *)PadnameTYPE(src), param); | |
2852 | PadnameOURSTASH(dst) = (HV *)sv_dup_inc((SV *)PadnameOURSTASH(src), | |
1604cfb0 | 2853 | param); |
0f94cb1f FC |
2854 | dst->xpadn_low = src->xpadn_low; |
2855 | dst->xpadn_high = src->xpadn_high; | |
2856 | dst->xpadn_gen = src->xpadn_gen; | |
2857 | return dst; | |
2858 | } | |
2859 | ||
2860 | #endif /* USE_ITHREADS */ | |
9b7476d7 FC |
2861 | |
2862 | /* | |
14d04a33 | 2863 | * ex: set ts=8 sts=4 sw=4 et: |
37442d52 | 2864 | */ |