| 1 | /* pad.c |
| 2 | * |
| 3 | * Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
| 4 | * by Larry Wall and others |
| 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. |
| 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 |
| 17 | * |
| 18 | * [p.23 of _The Lord of the Rings_, I/i: "A Long-Expected Party"] |
| 19 | */ |
| 20 | |
| 21 | /* XXX DAPM |
| 22 | * As of Sept 2002, this file is new and may be in a state of flux for |
| 23 | * a while. I've marked things I intent to come back and look at further |
| 24 | * with an 'XXX DAPM' comment. |
| 25 | */ |
| 26 | |
| 27 | /* |
| 28 | =head1 Pad Data Structures |
| 29 | |
| 30 | =for apidoc Amx|PADLIST *|CvPADLIST|CV *cv |
| 31 | |
| 32 | CV's can have CvPADLIST(cv) set to point to an AV. This is the CV's |
| 33 | scratchpad, which stores lexical variables and opcode temporary and |
| 34 | per-thread values. |
| 35 | |
| 36 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're |
| 37 | not callable at will and are always thrown away after the eval"" is done |
| 38 | executing). Require'd files are simply evals without any outer lexical |
| 39 | scope. |
| 40 | |
| 41 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, |
| 42 | but that is really the callers pad (a slot of which is allocated by |
| 43 | every entersub). |
| 44 | |
| 45 | The CvPADLIST AV has the REFCNT of its component items managed "manually" |
| 46 | (mostly in pad.c) rather than by normal av.c rules. So we turn off AvREAL |
| 47 | just before freeing it, to let av.c know not to touch the entries. |
| 48 | The items in the AV are not SVs as for a normal AV, but other AVs: |
| 49 | |
| 50 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather |
| 51 | the "static type information" for lexicals. |
| 52 | |
| 53 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that |
| 54 | depth of recursion into the CV. |
| 55 | The 0'th slot of a frame AV is an AV which is @_. |
| 56 | other entries are storage for variables and op targets. |
| 57 | |
| 58 | Iterating over the names AV iterates over all possible pad |
| 59 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
| 60 | &PL_sv_undef "names" (see pad_alloc()). |
| 61 | |
| 62 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. |
| 63 | The rest are op targets/GVs/constants which are statically allocated |
| 64 | or resolved at compile time. These don't have names by which they |
| 65 | can be looked up from Perl code at run time through eval"" like |
| 66 | my/our variables can be. Since they can't be looked up by "name" |
| 67 | but only by their index allocated at compile time (which is usually |
| 68 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. |
| 69 | |
| 70 | The SVs in the names AV have their PV being the name of the variable. |
| 71 | xlow+1..xhigh inclusive in the NV union is a range of cop_seq numbers for |
| 72 | which the name is valid (accessed through the macros COP_SEQ_RANGE_LOW and |
| 73 | _HIGH). During compilation, these fields may hold the special value |
| 74 | PERL_PADSEQ_INTRO to indicate various stages: |
| 75 | |
| 76 | COP_SEQ_RANGE_LOW _HIGH |
| 77 | ----------------- ----- |
| 78 | PERL_PADSEQ_INTRO 0 variable not yet introduced: { my ($x |
| 79 | valid-seq# PERL_PADSEQ_INTRO variable in scope: { my ($x) |
| 80 | valid-seq# valid-seq# compilation of scope complete: { my ($x) } |
| 81 | |
| 82 | For typed lexicals name SV is SVt_PVMG and SvSTASH |
| 83 | points at the type. For C<our> lexicals, the type is also SVt_PVMG, with the |
| 84 | SvOURSTASH slot pointing at the stash of the associated global (so that |
| 85 | duplicate C<our> declarations in the same package can be detected). SvUVX is |
| 86 | sometimes hijacked to store the generation number during compilation. |
| 87 | |
| 88 | If SvFAKE is set on the name SV, then that slot in the frame AV is |
| 89 | a REFCNT'ed reference to a lexical from "outside". In this case, |
| 90 | the name SV does not use xlow and xhigh to store a cop_seq range, since it is |
| 91 | in scope throughout. Instead xhigh stores some flags containing info about |
| 92 | the real lexical (is it declared in an anon, and is it capable of being |
| 93 | instantiated multiple times?), and for fake ANONs, xlow contains the index |
| 94 | within the parent's pad where the lexical's value is stored, to make |
| 95 | cloning quicker. |
| 96 | |
| 97 | If the 'name' is '&' the corresponding entry in frame AV |
| 98 | is a CV representing a possible closure. |
| 99 | (SvFAKE and name of '&' is not a meaningful combination currently but could |
| 100 | become so if C<my sub foo {}> is implemented.) |
| 101 | |
| 102 | Note that formats are treated as anon subs, and are cloned each time |
| 103 | write is called (if necessary). |
| 104 | |
| 105 | The flag SVs_PADSTALE is cleared on lexicals each time the my() is executed, |
| 106 | and set on scope exit. This allows the 'Variable $x is not available' warning |
| 107 | to be generated in evals, such as |
| 108 | |
| 109 | { my $x = 1; sub f { eval '$x'} } f(); |
| 110 | |
| 111 | For state vars, SVs_PADSTALE is overloaded to mean 'not yet initialised' |
| 112 | |
| 113 | =for apidoc AmxU|AV *|PL_comppad_name |
| 114 | |
| 115 | During compilation, this points to the array containing the names part |
| 116 | of the pad for the currently-compiling code. |
| 117 | |
| 118 | =for apidoc AmxU|AV *|PL_comppad |
| 119 | |
| 120 | During compilation, this points to the array containing the values |
| 121 | part of the pad for the currently-compiling code. (At runtime a CV may |
| 122 | have many such value arrays; at compile time just one is constructed.) |
| 123 | At runtime, this points to the array containing the currently-relevant |
| 124 | values for the pad for the currently-executing code. |
| 125 | |
| 126 | =for apidoc AmxU|SV **|PL_curpad |
| 127 | |
| 128 | Points directly to the body of the L</PL_comppad> array. |
| 129 | (I.e., this is C<AvARRAY(PL_comppad)>.) |
| 130 | |
| 131 | =cut |
| 132 | */ |
| 133 | |
| 134 | |
| 135 | #include "EXTERN.h" |
| 136 | #define PERL_IN_PAD_C |
| 137 | #include "perl.h" |
| 138 | #include "keywords.h" |
| 139 | |
| 140 | #define COP_SEQ_RANGE_LOW_set(sv,val) \ |
| 141 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END |
| 142 | #define COP_SEQ_RANGE_HIGH_set(sv,val) \ |
| 143 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END |
| 144 | |
| 145 | #define PARENT_PAD_INDEX_set(sv,val) \ |
| 146 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END |
| 147 | #define PARENT_FAKELEX_FLAGS_set(sv,val) \ |
| 148 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END |
| 149 | |
| 150 | /* |
| 151 | =for apidoc mx|void|pad_peg|const char *s |
| 152 | |
| 153 | When PERL_MAD is enabled, this is a small no-op function that gets called |
| 154 | at the start of each pad-related function. It can be breakpointed to |
| 155 | track all pad operations. The parameter is a string indicating the type |
| 156 | of pad operation being performed. |
| 157 | |
| 158 | =cut |
| 159 | */ |
| 160 | |
| 161 | #ifdef PERL_MAD |
| 162 | void pad_peg(const char* s) { |
| 163 | static int pegcnt; /* XXX not threadsafe */ |
| 164 | PERL_UNUSED_ARG(s); |
| 165 | |
| 166 | PERL_ARGS_ASSERT_PAD_PEG; |
| 167 | |
| 168 | pegcnt++; |
| 169 | } |
| 170 | #endif |
| 171 | |
| 172 | /* |
| 173 | This is basically sv_eq_flags() in sv.c, but we avoid the magic |
| 174 | and bytes checking. |
| 175 | */ |
| 176 | |
| 177 | static bool |
| 178 | sv_eq_pvn_flags(pTHX_ const SV *sv, const char* pv, const STRLEN pvlen, const U32 flags) { |
| 179 | if ( (SvUTF8(sv) & SVf_UTF8 ) != (flags & SVf_UTF8) ) { |
| 180 | const char *pv1 = SvPVX_const(sv); |
| 181 | STRLEN cur1 = SvCUR(sv); |
| 182 | const char *pv2 = pv; |
| 183 | STRLEN cur2 = pvlen; |
| 184 | if (PL_encoding) { |
| 185 | SV* svrecode = NULL; |
| 186 | if (SvUTF8(sv)) { |
| 187 | svrecode = newSVpvn(pv2, cur2); |
| 188 | sv_recode_to_utf8(svrecode, PL_encoding); |
| 189 | pv2 = SvPV_const(svrecode, cur2); |
| 190 | } |
| 191 | else { |
| 192 | svrecode = newSVpvn(pv1, cur1); |
| 193 | sv_recode_to_utf8(svrecode, PL_encoding); |
| 194 | pv1 = SvPV_const(svrecode, cur1); |
| 195 | } |
| 196 | SvREFCNT_dec(svrecode); |
| 197 | } |
| 198 | if (flags & SVf_UTF8) |
| 199 | return (bytes_cmp_utf8( |
| 200 | (const U8*)pv1, cur1, |
| 201 | (const U8*)pv2, cur2) == 0); |
| 202 | else |
| 203 | return (bytes_cmp_utf8( |
| 204 | (const U8*)pv2, cur2, |
| 205 | (const U8*)pv1, cur1) == 0); |
| 206 | } |
| 207 | else |
| 208 | return ((SvPVX_const(sv) == pv) |
| 209 | || memEQ(SvPVX_const(sv), pv, pvlen)); |
| 210 | } |
| 211 | |
| 212 | |
| 213 | /* |
| 214 | =for apidoc Am|PADLIST *|pad_new|int flags |
| 215 | |
| 216 | Create a new padlist, updating the global variables for the |
| 217 | currently-compiling padlist to point to the new padlist. The following |
| 218 | flags can be OR'ed together: |
| 219 | |
| 220 | padnew_CLONE this pad is for a cloned CV |
| 221 | padnew_SAVE save old globals on the save stack |
| 222 | padnew_SAVESUB also save extra stuff for start of sub |
| 223 | |
| 224 | =cut |
| 225 | */ |
| 226 | |
| 227 | PADLIST * |
| 228 | Perl_pad_new(pTHX_ int flags) |
| 229 | { |
| 230 | dVAR; |
| 231 | AV *padlist, *padname, *pad; |
| 232 | SV **ary; |
| 233 | |
| 234 | ASSERT_CURPAD_LEGAL("pad_new"); |
| 235 | |
| 236 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
| 237 | * vars (based on flags) rather than storing vals + addresses for |
| 238 | * each individually. Also see pad_block_start. |
| 239 | * XXX DAPM Try to see whether all these conditionals are required |
| 240 | */ |
| 241 | |
| 242 | /* save existing state, ... */ |
| 243 | |
| 244 | if (flags & padnew_SAVE) { |
| 245 | SAVECOMPPAD(); |
| 246 | SAVESPTR(PL_comppad_name); |
| 247 | if (! (flags & padnew_CLONE)) { |
| 248 | SAVEI32(PL_padix); |
| 249 | SAVEI32(PL_comppad_name_fill); |
| 250 | SAVEI32(PL_min_intro_pending); |
| 251 | SAVEI32(PL_max_intro_pending); |
| 252 | SAVEBOOL(PL_cv_has_eval); |
| 253 | if (flags & padnew_SAVESUB) { |
| 254 | SAVEBOOL(PL_pad_reset_pending); |
| 255 | } |
| 256 | } |
| 257 | } |
| 258 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be |
| 259 | * saved - check at some pt that this is okay */ |
| 260 | |
| 261 | /* ... create new pad ... */ |
| 262 | |
| 263 | padlist = newAV(); |
| 264 | padname = newAV(); |
| 265 | pad = newAV(); |
| 266 | |
| 267 | if (flags & padnew_CLONE) { |
| 268 | /* XXX DAPM I dont know why cv_clone needs it |
| 269 | * doing differently yet - perhaps this separate branch can be |
| 270 | * dispensed with eventually ??? |
| 271 | */ |
| 272 | |
| 273 | AV * const a0 = newAV(); /* will be @_ */ |
| 274 | av_store(pad, 0, MUTABLE_SV(a0)); |
| 275 | AvREIFY_only(a0); |
| 276 | } |
| 277 | else { |
| 278 | av_store(pad, 0, NULL); |
| 279 | } |
| 280 | |
| 281 | /* Most subroutines never recurse, hence only need 2 entries in the padlist |
| 282 | array - names, and depth=1. The default for av_store() is to allocate |
| 283 | 0..3, and even an explicit call to av_extend() with <3 will be rounded |
| 284 | up, so we inline the allocation of the array here. */ |
| 285 | Newx(ary, 2, SV*); |
| 286 | AvFILLp(padlist) = 1; |
| 287 | AvMAX(padlist) = 1; |
| 288 | AvALLOC(padlist) = ary; |
| 289 | AvARRAY(padlist) = ary; |
| 290 | ary[0] = MUTABLE_SV(padname); |
| 291 | ary[1] = MUTABLE_SV(pad); |
| 292 | |
| 293 | /* ... then update state variables */ |
| 294 | |
| 295 | PL_comppad_name = padname; |
| 296 | PL_comppad = pad; |
| 297 | PL_curpad = AvARRAY(pad); |
| 298 | |
| 299 | if (! (flags & padnew_CLONE)) { |
| 300 | PL_comppad_name_fill = 0; |
| 301 | PL_min_intro_pending = 0; |
| 302 | PL_padix = 0; |
| 303 | PL_cv_has_eval = 0; |
| 304 | } |
| 305 | |
| 306 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 307 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
| 308 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
| 309 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
| 310 | PTR2UV(padname), (UV)flags |
| 311 | ) |
| 312 | ); |
| 313 | |
| 314 | return (PADLIST*)padlist; |
| 315 | } |
| 316 | |
| 317 | |
| 318 | /* |
| 319 | =head1 Embedding Functions |
| 320 | |
| 321 | =for apidoc cv_undef |
| 322 | |
| 323 | Clear out all the active components of a CV. This can happen either |
| 324 | by an explicit C<undef &foo>, or by the reference count going to zero. |
| 325 | In the former case, we keep the CvOUTSIDE pointer, so that any anonymous |
| 326 | children can still follow the full lexical scope chain. |
| 327 | |
| 328 | =cut |
| 329 | */ |
| 330 | |
| 331 | void |
| 332 | Perl_cv_undef(pTHX_ CV *cv) |
| 333 | { |
| 334 | dVAR; |
| 335 | const PADLIST *padlist = CvPADLIST(cv); |
| 336 | |
| 337 | PERL_ARGS_ASSERT_CV_UNDEF; |
| 338 | |
| 339 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 340 | "CV undef: cv=0x%"UVxf" comppad=0x%"UVxf"\n", |
| 341 | PTR2UV(cv), PTR2UV(PL_comppad)) |
| 342 | ); |
| 343 | |
| 344 | if (CvFILE(cv) && CvDYNFILE(cv)) { |
| 345 | Safefree(CvFILE(cv)); |
| 346 | } |
| 347 | CvFILE(cv) = NULL; |
| 348 | |
| 349 | if (!CvISXSUB(cv) && CvROOT(cv)) { |
| 350 | if (SvTYPE(cv) == SVt_PVCV && CvDEPTH(cv)) |
| 351 | Perl_croak(aTHX_ "Can't undef active subroutine"); |
| 352 | ENTER; |
| 353 | |
| 354 | PAD_SAVE_SETNULLPAD(); |
| 355 | |
| 356 | op_free(CvROOT(cv)); |
| 357 | CvROOT(cv) = NULL; |
| 358 | CvSTART(cv) = NULL; |
| 359 | LEAVE; |
| 360 | } |
| 361 | SvPOK_off(MUTABLE_SV(cv)); /* forget prototype */ |
| 362 | CvGV_set(cv, NULL); |
| 363 | |
| 364 | /* This statement and the subsequence if block was pad_undef(). */ |
| 365 | pad_peg("pad_undef"); |
| 366 | |
| 367 | if (padlist && !SvIS_FREED(padlist) /* may be during global destruction */ |
| 368 | ) { |
| 369 | I32 ix; |
| 370 | |
| 371 | /* Free the padlist associated with a CV. |
| 372 | If parts of it happen to be current, we null the relevant PL_*pad* |
| 373 | global vars so that we don't have any dangling references left. |
| 374 | We also repoint the CvOUTSIDE of any about-to-be-orphaned inner |
| 375 | subs to the outer of this cv. */ |
| 376 | |
| 377 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 378 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf" comppad=0x%"UVxf"\n", |
| 379 | PTR2UV(cv), PTR2UV(padlist), PTR2UV(PL_comppad)) |
| 380 | ); |
| 381 | |
| 382 | /* detach any '&' anon children in the pad; if afterwards they |
| 383 | * are still live, fix up their CvOUTSIDEs to point to our outside, |
| 384 | * bypassing us. */ |
| 385 | /* XXX DAPM for efficiency, we should only do this if we know we have |
| 386 | * children, or integrate this loop with general cleanup */ |
| 387 | |
| 388 | if (PL_phase != PERL_PHASE_DESTRUCT) { /* don't bother during global destruction */ |
| 389 | CV * const outercv = CvOUTSIDE(cv); |
| 390 | const U32 seq = CvOUTSIDE_SEQ(cv); |
| 391 | AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
| 392 | SV ** const namepad = AvARRAY(comppad_name); |
| 393 | AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]); |
| 394 | SV ** const curpad = AvARRAY(comppad); |
| 395 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
| 396 | SV * const namesv = namepad[ix]; |
| 397 | if (namesv && namesv != &PL_sv_undef |
| 398 | && *SvPVX_const(namesv) == '&') |
| 399 | { |
| 400 | CV * const innercv = MUTABLE_CV(curpad[ix]); |
| 401 | U32 inner_rc = SvREFCNT(innercv); |
| 402 | assert(inner_rc); |
| 403 | namepad[ix] = NULL; |
| 404 | SvREFCNT_dec(namesv); |
| 405 | |
| 406 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ |
| 407 | curpad[ix] = NULL; |
| 408 | SvREFCNT_dec(innercv); |
| 409 | inner_rc--; |
| 410 | } |
| 411 | |
| 412 | /* in use, not just a prototype */ |
| 413 | if (inner_rc && (CvOUTSIDE(innercv) == cv)) { |
| 414 | assert(CvWEAKOUTSIDE(innercv)); |
| 415 | /* don't relink to grandfather if he's being freed */ |
| 416 | if (outercv && SvREFCNT(outercv)) { |
| 417 | CvWEAKOUTSIDE_off(innercv); |
| 418 | CvOUTSIDE(innercv) = outercv; |
| 419 | CvOUTSIDE_SEQ(innercv) = seq; |
| 420 | SvREFCNT_inc_simple_void_NN(outercv); |
| 421 | } |
| 422 | else { |
| 423 | CvOUTSIDE(innercv) = NULL; |
| 424 | } |
| 425 | } |
| 426 | } |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | ix = AvFILLp(padlist); |
| 431 | while (ix > 0) { |
| 432 | SV* const sv = AvARRAY(padlist)[ix--]; |
| 433 | if (sv) { |
| 434 | if (sv == (const SV *)PL_comppad) { |
| 435 | PL_comppad = NULL; |
| 436 | PL_curpad = NULL; |
| 437 | } |
| 438 | SvREFCNT_dec(sv); |
| 439 | } |
| 440 | } |
| 441 | { |
| 442 | SV *const sv = AvARRAY(padlist)[0]; |
| 443 | if (sv == (const SV *)PL_comppad_name) |
| 444 | PL_comppad_name = NULL; |
| 445 | SvREFCNT_dec(sv); |
| 446 | } |
| 447 | AvREAL_off(CvPADLIST(cv)); |
| 448 | SvREFCNT_dec(MUTABLE_SV(CvPADLIST(cv))); |
| 449 | CvPADLIST(cv) = NULL; |
| 450 | } |
| 451 | |
| 452 | |
| 453 | /* remove CvOUTSIDE unless this is an undef rather than a free */ |
| 454 | if (!SvREFCNT(cv) && CvOUTSIDE(cv)) { |
| 455 | if (!CvWEAKOUTSIDE(cv)) |
| 456 | SvREFCNT_dec(CvOUTSIDE(cv)); |
| 457 | CvOUTSIDE(cv) = NULL; |
| 458 | } |
| 459 | if (CvCONST(cv)) { |
| 460 | SvREFCNT_dec(MUTABLE_SV(CvXSUBANY(cv).any_ptr)); |
| 461 | CvCONST_off(cv); |
| 462 | } |
| 463 | if (CvISXSUB(cv) && CvXSUB(cv)) { |
| 464 | CvXSUB(cv) = NULL; |
| 465 | } |
| 466 | /* delete all flags except WEAKOUTSIDE and CVGV_RC, which indicate the |
| 467 | * ref status of CvOUTSIDE and CvGV, and ANON, which pp_entersub uses |
| 468 | * to choose an error message */ |
| 469 | CvFLAGS(cv) &= (CVf_WEAKOUTSIDE|CVf_CVGV_RC|CVf_ANON); |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | =for apidoc m|PADOFFSET|pad_alloc_name|SV *namesv|U32 flags|HV *typestash|HV *ourstash |
| 474 | |
| 475 | Allocates a place in the currently-compiling |
| 476 | pad (via L<perlapi/pad_alloc>) and |
| 477 | then stores a name for that entry. I<namesv> is adopted and becomes the |
| 478 | name entry; it must already contain the name string and be sufficiently |
| 479 | upgraded. I<typestash> and I<ourstash> and the C<padadd_STATE> flag get |
| 480 | added to I<namesv>. None of the other |
| 481 | processing of L<perlapi/pad_add_name_pvn> |
| 482 | is done. Returns the offset of the allocated pad slot. |
| 483 | |
| 484 | =cut |
| 485 | */ |
| 486 | |
| 487 | static PADOFFSET |
| 488 | S_pad_alloc_name(pTHX_ SV *namesv, U32 flags, HV *typestash, HV *ourstash) |
| 489 | { |
| 490 | dVAR; |
| 491 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
| 492 | |
| 493 | PERL_ARGS_ASSERT_PAD_ALLOC_NAME; |
| 494 | |
| 495 | ASSERT_CURPAD_ACTIVE("pad_alloc_name"); |
| 496 | |
| 497 | if (typestash) { |
| 498 | assert(SvTYPE(namesv) == SVt_PVMG); |
| 499 | SvPAD_TYPED_on(namesv); |
| 500 | SvSTASH_set(namesv, MUTABLE_HV(SvREFCNT_inc_simple_NN(MUTABLE_SV(typestash)))); |
| 501 | } |
| 502 | if (ourstash) { |
| 503 | SvPAD_OUR_on(namesv); |
| 504 | SvOURSTASH_set(namesv, ourstash); |
| 505 | SvREFCNT_inc_simple_void_NN(ourstash); |
| 506 | } |
| 507 | else if (flags & padadd_STATE) { |
| 508 | SvPAD_STATE_on(namesv); |
| 509 | } |
| 510 | |
| 511 | av_store(PL_comppad_name, offset, namesv); |
| 512 | return offset; |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | =for apidoc Am|PADOFFSET|pad_add_name_pvn|const char *namepv|STRLEN namelen|U32 flags|HV *typestash|HV *ourstash |
| 517 | |
| 518 | Allocates a place in the currently-compiling pad for a named lexical |
| 519 | variable. Stores the name and other metadata in the name part of the |
| 520 | pad, and makes preparations to manage the variable's lexical scoping. |
| 521 | Returns the offset of the allocated pad slot. |
| 522 | |
| 523 | I<namepv>/I<namelen> specify the variable's name, including leading sigil. |
| 524 | If I<typestash> is non-null, the name is for a typed lexical, and this |
| 525 | identifies the type. If I<ourstash> is non-null, it's a lexical reference |
| 526 | to a package variable, and this identifies the package. The following |
| 527 | flags can be OR'ed together: |
| 528 | |
| 529 | padadd_OUR redundantly specifies if it's a package var |
| 530 | padadd_STATE variable will retain value persistently |
| 531 | padadd_NO_DUP_CHECK skip check for lexical shadowing |
| 532 | |
| 533 | =cut |
| 534 | */ |
| 535 | |
| 536 | PADOFFSET |
| 537 | Perl_pad_add_name_pvn(pTHX_ const char *namepv, STRLEN namelen, |
| 538 | U32 flags, HV *typestash, HV *ourstash) |
| 539 | { |
| 540 | dVAR; |
| 541 | PADOFFSET offset; |
| 542 | SV *namesv; |
| 543 | bool is_utf8; |
| 544 | |
| 545 | PERL_ARGS_ASSERT_PAD_ADD_NAME_PVN; |
| 546 | |
| 547 | if (flags & ~(padadd_OUR|padadd_STATE|padadd_NO_DUP_CHECK|padadd_UTF8_NAME)) |
| 548 | Perl_croak(aTHX_ "panic: pad_add_name_pvn illegal flag bits 0x%" UVxf, |
| 549 | (UV)flags); |
| 550 | |
| 551 | namesv = newSV_type((ourstash || typestash) ? SVt_PVMG : SVt_PVNV); |
| 552 | |
| 553 | if ((is_utf8 = ((flags & padadd_UTF8_NAME) != 0))) { |
| 554 | namepv = (const char*)bytes_from_utf8((U8*)namepv, &namelen, &is_utf8); |
| 555 | } |
| 556 | |
| 557 | sv_setpvn(namesv, namepv, namelen); |
| 558 | |
| 559 | if (is_utf8) { |
| 560 | flags |= padadd_UTF8_NAME; |
| 561 | SvUTF8_on(namesv); |
| 562 | } |
| 563 | else |
| 564 | flags &= ~padadd_UTF8_NAME; |
| 565 | |
| 566 | if ((flags & padadd_NO_DUP_CHECK) == 0) { |
| 567 | /* check for duplicate declaration */ |
| 568 | pad_check_dup(namesv, flags & padadd_OUR, ourstash); |
| 569 | } |
| 570 | |
| 571 | offset = pad_alloc_name(namesv, flags & ~padadd_UTF8_NAME, typestash, ourstash); |
| 572 | |
| 573 | /* not yet introduced */ |
| 574 | COP_SEQ_RANGE_LOW_set(namesv, PERL_PADSEQ_INTRO); |
| 575 | COP_SEQ_RANGE_HIGH_set(namesv, 0); |
| 576 | |
| 577 | if (!PL_min_intro_pending) |
| 578 | PL_min_intro_pending = offset; |
| 579 | PL_max_intro_pending = offset; |
| 580 | /* if it's not a simple scalar, replace with an AV or HV */ |
| 581 | assert(SvTYPE(PL_curpad[offset]) == SVt_NULL); |
| 582 | assert(SvREFCNT(PL_curpad[offset]) == 1); |
| 583 | if (namelen != 0 && *namepv == '@') |
| 584 | sv_upgrade(PL_curpad[offset], SVt_PVAV); |
| 585 | else if (namelen != 0 && *namepv == '%') |
| 586 | sv_upgrade(PL_curpad[offset], SVt_PVHV); |
| 587 | assert(SvPADMY(PL_curpad[offset])); |
| 588 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 589 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", |
| 590 | (long)offset, SvPVX(namesv), |
| 591 | PTR2UV(PL_curpad[offset]))); |
| 592 | |
| 593 | return offset; |
| 594 | } |
| 595 | |
| 596 | /* |
| 597 | =for apidoc Am|PADOFFSET|pad_add_name_pv|const char *name|U32 flags|HV *typestash|HV *ourstash |
| 598 | |
| 599 | Exactly like L</pad_add_name_pvn>, but takes a nul-terminated string |
| 600 | instead of a string/length pair. |
| 601 | |
| 602 | =cut |
| 603 | */ |
| 604 | |
| 605 | PADOFFSET |
| 606 | Perl_pad_add_name_pv(pTHX_ const char *name, |
| 607 | const U32 flags, HV *typestash, HV *ourstash) |
| 608 | { |
| 609 | PERL_ARGS_ASSERT_PAD_ADD_NAME_PV; |
| 610 | return pad_add_name_pvn(name, strlen(name), flags, typestash, ourstash); |
| 611 | } |
| 612 | |
| 613 | /* |
| 614 | =for apidoc Am|PADOFFSET|pad_add_name_sv|SV *name|U32 flags|HV *typestash|HV *ourstash |
| 615 | |
| 616 | Exactly like L</pad_add_name_pvn>, but takes the name string in the form |
| 617 | of an SV instead of a string/length pair. |
| 618 | |
| 619 | =cut |
| 620 | */ |
| 621 | |
| 622 | PADOFFSET |
| 623 | Perl_pad_add_name_sv(pTHX_ SV *name, U32 flags, HV *typestash, HV *ourstash) |
| 624 | { |
| 625 | char *namepv; |
| 626 | STRLEN namelen; |
| 627 | PERL_ARGS_ASSERT_PAD_ADD_NAME_SV; |
| 628 | namepv = SvPV(name, namelen); |
| 629 | if (SvUTF8(name)) |
| 630 | flags |= padadd_UTF8_NAME; |
| 631 | return pad_add_name_pvn(namepv, namelen, flags, typestash, ourstash); |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | =for apidoc Amx|PADOFFSET|pad_alloc|I32 optype|U32 tmptype |
| 636 | |
| 637 | Allocates a place in the currently-compiling pad, |
| 638 | returning the offset of the allocated pad slot. |
| 639 | No name is initially attached to the pad slot. |
| 640 | I<tmptype> is a set of flags indicating the kind of pad entry required, |
| 641 | which will be set in the value SV for the allocated pad entry: |
| 642 | |
| 643 | SVs_PADMY named lexical variable ("my", "our", "state") |
| 644 | SVs_PADTMP unnamed temporary store |
| 645 | |
| 646 | I<optype> should be an opcode indicating the type of operation that the |
| 647 | pad entry is to support. This doesn't affect operational semantics, |
| 648 | but is used for debugging. |
| 649 | |
| 650 | =cut |
| 651 | */ |
| 652 | |
| 653 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), |
| 654 | * or at least rationalise ??? */ |
| 655 | /* And flag whether the incoming name is UTF8 or 8 bit? |
| 656 | Could do this either with the +ve/-ve hack of the HV code, or expanding |
| 657 | the flag bits. Either way, this makes proper Unicode safe pad support. |
| 658 | NWC |
| 659 | */ |
| 660 | |
| 661 | PADOFFSET |
| 662 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) |
| 663 | { |
| 664 | dVAR; |
| 665 | SV *sv; |
| 666 | I32 retval; |
| 667 | |
| 668 | PERL_UNUSED_ARG(optype); |
| 669 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
| 670 | |
| 671 | if (AvARRAY(PL_comppad) != PL_curpad) |
| 672 | Perl_croak(aTHX_ "panic: pad_alloc"); |
| 673 | if (PL_pad_reset_pending) |
| 674 | pad_reset(); |
| 675 | if (tmptype & SVs_PADMY) { |
| 676 | /* For a my, simply push a null SV onto the end of PL_comppad. */ |
| 677 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
| 678 | retval = AvFILLp(PL_comppad); |
| 679 | } |
| 680 | else { |
| 681 | /* For a tmp, scan the pad from PL_padix upwards |
| 682 | * for a slot which has no name and no active value. |
| 683 | */ |
| 684 | SV * const * const names = AvARRAY(PL_comppad_name); |
| 685 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
| 686 | for (;;) { |
| 687 | /* |
| 688 | * "foreach" index vars temporarily become aliases to non-"my" |
| 689 | * values. Thus we must skip, not just pad values that are |
| 690 | * marked as current pad values, but also those with names. |
| 691 | */ |
| 692 | /* HVDS why copy to sv here? we don't seem to use it */ |
| 693 | if (++PL_padix <= names_fill && |
| 694 | (sv = names[PL_padix]) && sv != &PL_sv_undef) |
| 695 | continue; |
| 696 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); |
| 697 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && |
| 698 | !IS_PADGV(sv) && !IS_PADCONST(sv)) |
| 699 | break; |
| 700 | } |
| 701 | retval = PL_padix; |
| 702 | } |
| 703 | SvFLAGS(sv) |= tmptype; |
| 704 | PL_curpad = AvARRAY(PL_comppad); |
| 705 | |
| 706 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 707 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", |
| 708 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, |
| 709 | PL_op_name[optype])); |
| 710 | #ifdef DEBUG_LEAKING_SCALARS |
| 711 | sv->sv_debug_optype = optype; |
| 712 | sv->sv_debug_inpad = 1; |
| 713 | #endif |
| 714 | return (PADOFFSET)retval; |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | =for apidoc Am|PADOFFSET|pad_add_anon|CV *func|I32 optype |
| 719 | |
| 720 | Allocates a place in the currently-compiling pad (via L</pad_alloc>) |
| 721 | for an anonymous function that is lexically scoped inside the |
| 722 | currently-compiling function. |
| 723 | The function I<func> is linked into the pad, and its C<CvOUTSIDE> link |
| 724 | to the outer scope is weakened to avoid a reference loop. |
| 725 | |
| 726 | I<optype> should be an opcode indicating the type of operation that the |
| 727 | pad entry is to support. This doesn't affect operational semantics, |
| 728 | but is used for debugging. |
| 729 | |
| 730 | =cut |
| 731 | */ |
| 732 | |
| 733 | PADOFFSET |
| 734 | Perl_pad_add_anon(pTHX_ CV* func, I32 optype) |
| 735 | { |
| 736 | dVAR; |
| 737 | PADOFFSET ix; |
| 738 | SV* const name = newSV_type(SVt_PVNV); |
| 739 | |
| 740 | PERL_ARGS_ASSERT_PAD_ADD_ANON; |
| 741 | |
| 742 | pad_peg("add_anon"); |
| 743 | sv_setpvs(name, "&"); |
| 744 | /* These two aren't used; just make sure they're not equal to |
| 745 | * PERL_PADSEQ_INTRO */ |
| 746 | COP_SEQ_RANGE_LOW_set(name, 0); |
| 747 | COP_SEQ_RANGE_HIGH_set(name, 0); |
| 748 | ix = pad_alloc(optype, SVs_PADMY); |
| 749 | av_store(PL_comppad_name, ix, name); |
| 750 | /* XXX DAPM use PL_curpad[] ? */ |
| 751 | av_store(PL_comppad, ix, (SV*)func); |
| 752 | SvPADMY_on((SV*)func); |
| 753 | |
| 754 | /* to avoid ref loops, we never have parent + child referencing each |
| 755 | * other simultaneously */ |
| 756 | if (CvOUTSIDE(func)) { |
| 757 | assert(!CvWEAKOUTSIDE(func)); |
| 758 | CvWEAKOUTSIDE_on(func); |
| 759 | SvREFCNT_dec(CvOUTSIDE(func)); |
| 760 | } |
| 761 | return ix; |
| 762 | } |
| 763 | |
| 764 | /* |
| 765 | =for apidoc pad_check_dup |
| 766 | |
| 767 | Check for duplicate declarations: report any of: |
| 768 | |
| 769 | * a my in the current scope with the same name; |
| 770 | * an our (anywhere in the pad) with the same name and the |
| 771 | same stash as C<ourstash> |
| 772 | |
| 773 | C<is_our> indicates that the name to check is an 'our' declaration. |
| 774 | |
| 775 | =cut |
| 776 | */ |
| 777 | |
| 778 | STATIC void |
| 779 | S_pad_check_dup(pTHX_ SV *name, U32 flags, const HV *ourstash) |
| 780 | { |
| 781 | dVAR; |
| 782 | SV **svp; |
| 783 | PADOFFSET top, off; |
| 784 | const U32 is_our = flags & padadd_OUR; |
| 785 | |
| 786 | PERL_ARGS_ASSERT_PAD_CHECK_DUP; |
| 787 | |
| 788 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
| 789 | |
| 790 | assert((flags & ~padadd_OUR) == 0); |
| 791 | |
| 792 | if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) |
| 793 | return; /* nothing to check */ |
| 794 | |
| 795 | svp = AvARRAY(PL_comppad_name); |
| 796 | top = AvFILLp(PL_comppad_name); |
| 797 | /* check the current scope */ |
| 798 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
| 799 | * type ? */ |
| 800 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
| 801 | SV * const sv = svp[off]; |
| 802 | if (sv |
| 803 | && sv != &PL_sv_undef |
| 804 | && !SvFAKE(sv) |
| 805 | && ( COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO |
| 806 | || COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO) |
| 807 | && sv_eq(name, sv)) |
| 808 | { |
| 809 | if (is_our && (SvPAD_OUR(sv))) |
| 810 | break; /* "our" masking "our" */ |
| 811 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
| 812 | "\"%s\" variable %"SVf" masks earlier declaration in same %s", |
| 813 | (is_our ? "our" : PL_parser->in_my == KEY_my ? "my" : "state"), |
| 814 | sv, |
| 815 | (COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO |
| 816 | ? "scope" : "statement")); |
| 817 | --off; |
| 818 | break; |
| 819 | } |
| 820 | } |
| 821 | /* check the rest of the pad */ |
| 822 | if (is_our) { |
| 823 | while (off > 0) { |
| 824 | SV * const sv = svp[off]; |
| 825 | if (sv |
| 826 | && sv != &PL_sv_undef |
| 827 | && !SvFAKE(sv) |
| 828 | && ( COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO |
| 829 | || COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO) |
| 830 | && SvOURSTASH(sv) == ourstash |
| 831 | && sv_eq(name, sv)) |
| 832 | { |
| 833 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
| 834 | "\"our\" variable %"SVf" redeclared", sv); |
| 835 | if ((I32)off <= PL_comppad_name_floor) |
| 836 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
| 837 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
| 838 | break; |
| 839 | } |
| 840 | --off; |
| 841 | } |
| 842 | } |
| 843 | } |
| 844 | |
| 845 | |
| 846 | /* |
| 847 | =for apidoc Am|PADOFFSET|pad_findmy_pvn|const char *namepv|STRLEN namelen|U32 flags |
| 848 | |
| 849 | Given the name of a lexical variable, find its position in the |
| 850 | currently-compiling pad. |
| 851 | I<namepv>/I<namelen> specify the variable's name, including leading sigil. |
| 852 | I<flags> is reserved and must be zero. |
| 853 | If it is not in the current pad but appears in the pad of any lexically |
| 854 | enclosing scope, then a pseudo-entry for it is added in the current pad. |
| 855 | Returns the offset in the current pad, |
| 856 | or C<NOT_IN_PAD> if no such lexical is in scope. |
| 857 | |
| 858 | =cut |
| 859 | */ |
| 860 | |
| 861 | PADOFFSET |
| 862 | Perl_pad_findmy_pvn(pTHX_ const char *namepv, STRLEN namelen, U32 flags) |
| 863 | { |
| 864 | dVAR; |
| 865 | SV *out_sv; |
| 866 | int out_flags; |
| 867 | I32 offset; |
| 868 | const AV *nameav; |
| 869 | SV **name_svp; |
| 870 | |
| 871 | PERL_ARGS_ASSERT_PAD_FINDMY_PVN; |
| 872 | |
| 873 | pad_peg("pad_findmy_pvn"); |
| 874 | |
| 875 | if (flags & ~padadd_UTF8_NAME) |
| 876 | Perl_croak(aTHX_ "panic: pad_findmy_pvn illegal flag bits 0x%" UVxf, |
| 877 | (UV)flags); |
| 878 | |
| 879 | if (flags & padadd_UTF8_NAME) { |
| 880 | bool is_utf8 = TRUE; |
| 881 | namepv = (const char*)bytes_from_utf8((U8*)namepv, &namelen, &is_utf8); |
| 882 | |
| 883 | if (is_utf8) |
| 884 | flags |= padadd_UTF8_NAME; |
| 885 | else |
| 886 | flags &= ~padadd_UTF8_NAME; |
| 887 | } |
| 888 | |
| 889 | offset = pad_findlex(namepv, namelen, flags, |
| 890 | PL_compcv, PL_cop_seqmax, 1, NULL, &out_sv, &out_flags); |
| 891 | if ((PADOFFSET)offset != NOT_IN_PAD) |
| 892 | return offset; |
| 893 | |
| 894 | /* look for an our that's being introduced; this allows |
| 895 | * our $foo = 0 unless defined $foo; |
| 896 | * to not give a warning. (Yes, this is a hack) */ |
| 897 | |
| 898 | nameav = MUTABLE_AV(AvARRAY(CvPADLIST(PL_compcv))[0]); |
| 899 | name_svp = AvARRAY(nameav); |
| 900 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
| 901 | const SV * const namesv = name_svp[offset]; |
| 902 | if (namesv && namesv != &PL_sv_undef |
| 903 | && !SvFAKE(namesv) |
| 904 | && (SvPAD_OUR(namesv)) |
| 905 | && SvCUR(namesv) == namelen |
| 906 | && sv_eq_pvn_flags(aTHX_ namesv, namepv, namelen, |
| 907 | flags & padadd_UTF8_NAME ? SVf_UTF8 : 0 ) |
| 908 | && COP_SEQ_RANGE_LOW(namesv) == PERL_PADSEQ_INTRO |
| 909 | ) |
| 910 | return offset; |
| 911 | } |
| 912 | return NOT_IN_PAD; |
| 913 | } |
| 914 | |
| 915 | /* |
| 916 | =for apidoc Am|PADOFFSET|pad_findmy_pv|const char *name|U32 flags |
| 917 | |
| 918 | Exactly like L</pad_findmy_pvn>, but takes a nul-terminated string |
| 919 | instead of a string/length pair. |
| 920 | |
| 921 | =cut |
| 922 | */ |
| 923 | |
| 924 | PADOFFSET |
| 925 | Perl_pad_findmy_pv(pTHX_ const char *name, U32 flags) |
| 926 | { |
| 927 | PERL_ARGS_ASSERT_PAD_FINDMY_PV; |
| 928 | return pad_findmy_pvn(name, strlen(name), flags); |
| 929 | } |
| 930 | |
| 931 | /* |
| 932 | =for apidoc Am|PADOFFSET|pad_findmy_sv|SV *name|U32 flags |
| 933 | |
| 934 | Exactly like L</pad_findmy_pvn>, but takes the name string in the form |
| 935 | of an SV instead of a string/length pair. |
| 936 | |
| 937 | =cut |
| 938 | */ |
| 939 | |
| 940 | PADOFFSET |
| 941 | Perl_pad_findmy_sv(pTHX_ SV *name, U32 flags) |
| 942 | { |
| 943 | char *namepv; |
| 944 | STRLEN namelen; |
| 945 | PERL_ARGS_ASSERT_PAD_FINDMY_SV; |
| 946 | namepv = SvPV(name, namelen); |
| 947 | if (SvUTF8(name)) |
| 948 | flags |= padadd_UTF8_NAME; |
| 949 | return pad_findmy_pvn(namepv, namelen, flags); |
| 950 | } |
| 951 | |
| 952 | /* |
| 953 | =for apidoc Amp|PADOFFSET|find_rundefsvoffset |
| 954 | |
| 955 | Find the position of the lexical C<$_> in the pad of the |
| 956 | currently-executing function. Returns the offset in the current pad, |
| 957 | or C<NOT_IN_PAD> if there is no lexical C<$_> in scope (in which case |
| 958 | the global one should be used instead). |
| 959 | L</find_rundefsv> is likely to be more convenient. |
| 960 | |
| 961 | =cut |
| 962 | */ |
| 963 | |
| 964 | PADOFFSET |
| 965 | Perl_find_rundefsvoffset(pTHX) |
| 966 | { |
| 967 | dVAR; |
| 968 | SV *out_sv; |
| 969 | int out_flags; |
| 970 | return pad_findlex("$_", 2, 0, find_runcv(NULL), PL_curcop->cop_seq, 1, |
| 971 | NULL, &out_sv, &out_flags); |
| 972 | } |
| 973 | |
| 974 | /* |
| 975 | =for apidoc Am|SV *|find_rundefsv |
| 976 | |
| 977 | Find and return the variable that is named C<$_> in the lexical scope |
| 978 | of the currently-executing function. This may be a lexical C<$_>, |
| 979 | or will otherwise be the global one. |
| 980 | |
| 981 | =cut |
| 982 | */ |
| 983 | |
| 984 | SV * |
| 985 | Perl_find_rundefsv(pTHX) |
| 986 | { |
| 987 | SV *namesv; |
| 988 | int flags; |
| 989 | PADOFFSET po; |
| 990 | |
| 991 | po = pad_findlex("$_", 2, 0, find_runcv(NULL), PL_curcop->cop_seq, 1, |
| 992 | NULL, &namesv, &flags); |
| 993 | |
| 994 | if (po == NOT_IN_PAD || SvPAD_OUR(namesv)) |
| 995 | return DEFSV; |
| 996 | |
| 997 | return PAD_SVl(po); |
| 998 | } |
| 999 | |
| 1000 | SV * |
| 1001 | Perl_find_rundefsv2(pTHX_ CV *cv, U32 seq) |
| 1002 | { |
| 1003 | SV *namesv; |
| 1004 | int flags; |
| 1005 | PADOFFSET po; |
| 1006 | |
| 1007 | PERL_ARGS_ASSERT_FIND_RUNDEFSV2; |
| 1008 | |
| 1009 | po = pad_findlex("$_", 2, 0, cv, seq, 1, |
| 1010 | NULL, &namesv, &flags); |
| 1011 | |
| 1012 | if (po == NOT_IN_PAD || SvPAD_OUR(namesv)) |
| 1013 | return DEFSV; |
| 1014 | |
| 1015 | return AvARRAY((PAD*) (AvARRAY(CvPADLIST(cv))[CvDEPTH(cv)]))[po]; |
| 1016 | } |
| 1017 | |
| 1018 | /* |
| 1019 | =for apidoc m|PADOFFSET|pad_findlex|const char *namepv|STRLEN namelen|U32 flags|const CV* cv|U32 seq|int warn|SV** out_capture|SV** out_name_sv|int *out_flags |
| 1020 | |
| 1021 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
| 1022 | in the inner pads if it's found in an outer one. |
| 1023 | |
| 1024 | Returns the offset in the bottom pad of the lex or the fake lex. |
| 1025 | cv is the CV in which to start the search, and seq is the current cop_seq |
| 1026 | to match against. If warn is true, print appropriate warnings. The out_* |
| 1027 | vars return values, and so are pointers to where the returned values |
| 1028 | should be stored. out_capture, if non-null, requests that the innermost |
| 1029 | instance of the lexical is captured; out_name_sv is set to the innermost |
| 1030 | matched namesv or fake namesv; out_flags returns the flags normally |
| 1031 | associated with the IVX field of a fake namesv. |
| 1032 | |
| 1033 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, |
| 1034 | then comes back down, adding fake entries as it goes. It has to be this way |
| 1035 | because fake namesvs in anon protoypes have to store in xlow the index into |
| 1036 | the parent pad. |
| 1037 | |
| 1038 | =cut |
| 1039 | */ |
| 1040 | |
| 1041 | /* the CV has finished being compiled. This is not a sufficient test for |
| 1042 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ |
| 1043 | #define CvCOMPILED(cv) CvROOT(cv) |
| 1044 | |
| 1045 | /* the CV does late binding of its lexicals */ |
| 1046 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) |
| 1047 | |
| 1048 | |
| 1049 | STATIC PADOFFSET |
| 1050 | S_pad_findlex(pTHX_ const char *namepv, STRLEN namelen, U32 flags, const CV* cv, U32 seq, |
| 1051 | int warn, SV** out_capture, SV** out_name_sv, int *out_flags) |
| 1052 | { |
| 1053 | dVAR; |
| 1054 | I32 offset, new_offset; |
| 1055 | SV *new_capture; |
| 1056 | SV **new_capturep; |
| 1057 | const AV * const padlist = CvPADLIST(cv); |
| 1058 | |
| 1059 | PERL_ARGS_ASSERT_PAD_FINDLEX; |
| 1060 | |
| 1061 | if (flags & ~padadd_UTF8_NAME) |
| 1062 | Perl_croak(aTHX_ "panic: pad_findlex illegal flag bits 0x%" UVxf, |
| 1063 | (UV)flags); |
| 1064 | |
| 1065 | *out_flags = 0; |
| 1066 | |
| 1067 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1068 | "Pad findlex cv=0x%"UVxf" searching \"%.*s\" seq=%d%s\n", |
| 1069 | PTR2UV(cv), (int)namelen, namepv, (int)seq, |
| 1070 | out_capture ? " capturing" : "" )); |
| 1071 | |
| 1072 | /* first, search this pad */ |
| 1073 | |
| 1074 | if (padlist) { /* not an undef CV */ |
| 1075 | I32 fake_offset = 0; |
| 1076 | const AV * const nameav = MUTABLE_AV(AvARRAY(padlist)[0]); |
| 1077 | SV * const * const name_svp = AvARRAY(nameav); |
| 1078 | |
| 1079 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
| 1080 | const SV * const namesv = name_svp[offset]; |
| 1081 | if (namesv && namesv != &PL_sv_undef |
| 1082 | && SvCUR(namesv) == namelen |
| 1083 | && sv_eq_pvn_flags(aTHX_ namesv, namepv, namelen, |
| 1084 | flags & padadd_UTF8_NAME ? SVf_UTF8 : 0)) |
| 1085 | { |
| 1086 | if (SvFAKE(namesv)) { |
| 1087 | fake_offset = offset; /* in case we don't find a real one */ |
| 1088 | continue; |
| 1089 | } |
| 1090 | /* is seq within the range _LOW to _HIGH ? |
| 1091 | * This is complicated by the fact that PL_cop_seqmax |
| 1092 | * may have wrapped around at some point */ |
| 1093 | if (COP_SEQ_RANGE_LOW(namesv) == PERL_PADSEQ_INTRO) |
| 1094 | continue; /* not yet introduced */ |
| 1095 | |
| 1096 | if (COP_SEQ_RANGE_HIGH(namesv) == PERL_PADSEQ_INTRO) { |
| 1097 | /* in compiling scope */ |
| 1098 | if ( |
| 1099 | (seq > COP_SEQ_RANGE_LOW(namesv)) |
| 1100 | ? (seq - COP_SEQ_RANGE_LOW(namesv) < (U32_MAX >> 1)) |
| 1101 | : (COP_SEQ_RANGE_LOW(namesv) - seq > (U32_MAX >> 1)) |
| 1102 | ) |
| 1103 | break; |
| 1104 | } |
| 1105 | else if ( |
| 1106 | (COP_SEQ_RANGE_LOW(namesv) > COP_SEQ_RANGE_HIGH(namesv)) |
| 1107 | ? |
| 1108 | ( seq > COP_SEQ_RANGE_LOW(namesv) |
| 1109 | || seq <= COP_SEQ_RANGE_HIGH(namesv)) |
| 1110 | |
| 1111 | : ( seq > COP_SEQ_RANGE_LOW(namesv) |
| 1112 | && seq <= COP_SEQ_RANGE_HIGH(namesv)) |
| 1113 | ) |
| 1114 | break; |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
| 1119 | if (offset > 0) { /* not fake */ |
| 1120 | fake_offset = 0; |
| 1121 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
| 1122 | |
| 1123 | /* set PAD_FAKELEX_MULTI if this lex can have multiple |
| 1124 | * instances. For now, we just test !CvUNIQUE(cv), but |
| 1125 | * ideally, we should detect my's declared within loops |
| 1126 | * etc - this would allow a wider range of 'not stayed |
| 1127 | * shared' warnings. We also treated already-compiled |
| 1128 | * lexes as not multi as viewed from evals. */ |
| 1129 | |
| 1130 | *out_flags = CvANON(cv) ? |
| 1131 | PAD_FAKELEX_ANON : |
| 1132 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) |
| 1133 | ? PAD_FAKELEX_MULTI : 0; |
| 1134 | |
| 1135 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1136 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%lu,%lu)\n", |
| 1137 | PTR2UV(cv), (long)offset, |
| 1138 | (unsigned long)COP_SEQ_RANGE_LOW(*out_name_sv), |
| 1139 | (unsigned long)COP_SEQ_RANGE_HIGH(*out_name_sv))); |
| 1140 | } |
| 1141 | else { /* fake match */ |
| 1142 | offset = fake_offset; |
| 1143 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
| 1144 | *out_flags = PARENT_FAKELEX_FLAGS(*out_name_sv); |
| 1145 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1146 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
| 1147 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
| 1148 | (unsigned long) PARENT_PAD_INDEX(*out_name_sv) |
| 1149 | )); |
| 1150 | } |
| 1151 | |
| 1152 | /* return the lex? */ |
| 1153 | |
| 1154 | if (out_capture) { |
| 1155 | |
| 1156 | /* our ? */ |
| 1157 | if (SvPAD_OUR(*out_name_sv)) { |
| 1158 | *out_capture = NULL; |
| 1159 | return offset; |
| 1160 | } |
| 1161 | |
| 1162 | /* trying to capture from an anon prototype? */ |
| 1163 | if (CvCOMPILED(cv) |
| 1164 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) |
| 1165 | : *out_flags & PAD_FAKELEX_ANON) |
| 1166 | { |
| 1167 | if (warn) |
| 1168 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
| 1169 | "Variable \"%"SVf"\" is not available", |
| 1170 | newSVpvn_flags(namepv, namelen, |
| 1171 | SVs_TEMP | |
| 1172 | (flags & padadd_UTF8_NAME ? SVf_UTF8 : 0))); |
| 1173 | |
| 1174 | *out_capture = NULL; |
| 1175 | } |
| 1176 | |
| 1177 | /* real value */ |
| 1178 | else { |
| 1179 | int newwarn = warn; |
| 1180 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) |
| 1181 | && !SvPAD_STATE(name_svp[offset]) |
| 1182 | && warn && ckWARN(WARN_CLOSURE)) { |
| 1183 | newwarn = 0; |
| 1184 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
| 1185 | "Variable \"%"SVf"\" will not stay shared", |
| 1186 | newSVpvn_flags(namepv, namelen, |
| 1187 | SVs_TEMP | |
| 1188 | (flags & padadd_UTF8_NAME ? SVf_UTF8 : 0))); |
| 1189 | } |
| 1190 | |
| 1191 | if (fake_offset && CvANON(cv) |
| 1192 | && CvCLONE(cv) &&!CvCLONED(cv)) |
| 1193 | { |
| 1194 | SV *n; |
| 1195 | /* not yet caught - look further up */ |
| 1196 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1197 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", |
| 1198 | PTR2UV(cv))); |
| 1199 | n = *out_name_sv; |
| 1200 | (void) pad_findlex(namepv, namelen, flags, CvOUTSIDE(cv), |
| 1201 | CvOUTSIDE_SEQ(cv), |
| 1202 | newwarn, out_capture, out_name_sv, out_flags); |
| 1203 | *out_name_sv = n; |
| 1204 | return offset; |
| 1205 | } |
| 1206 | |
| 1207 | *out_capture = AvARRAY(MUTABLE_AV(AvARRAY(padlist)[ |
| 1208 | CvDEPTH(cv) ? CvDEPTH(cv) : 1]))[offset]; |
| 1209 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1210 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", |
| 1211 | PTR2UV(cv), PTR2UV(*out_capture))); |
| 1212 | |
| 1213 | if (SvPADSTALE(*out_capture) |
| 1214 | && !SvPAD_STATE(name_svp[offset])) |
| 1215 | { |
| 1216 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
| 1217 | "Variable \"%"SVf"\" is not available", |
| 1218 | newSVpvn_flags(namepv, namelen, |
| 1219 | SVs_TEMP | |
| 1220 | (flags & padadd_UTF8_NAME ? SVf_UTF8 : 0))); |
| 1221 | *out_capture = NULL; |
| 1222 | } |
| 1223 | } |
| 1224 | if (!*out_capture) { |
| 1225 | if (namelen != 0 && *namepv == '@') |
| 1226 | *out_capture = sv_2mortal(MUTABLE_SV(newAV())); |
| 1227 | else if (namelen != 0 && *namepv == '%') |
| 1228 | *out_capture = sv_2mortal(MUTABLE_SV(newHV())); |
| 1229 | else |
| 1230 | *out_capture = sv_newmortal(); |
| 1231 | } |
| 1232 | } |
| 1233 | |
| 1234 | return offset; |
| 1235 | } |
| 1236 | } |
| 1237 | |
| 1238 | /* it's not in this pad - try above */ |
| 1239 | |
| 1240 | if (!CvOUTSIDE(cv)) |
| 1241 | return NOT_IN_PAD; |
| 1242 | |
| 1243 | /* out_capture non-null means caller wants us to capture lex; in |
| 1244 | * addition we capture ourselves unless it's an ANON/format */ |
| 1245 | new_capturep = out_capture ? out_capture : |
| 1246 | CvLATE(cv) ? NULL : &new_capture; |
| 1247 | |
| 1248 | offset = pad_findlex(namepv, namelen, flags, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, |
| 1249 | new_capturep, out_name_sv, out_flags); |
| 1250 | if ((PADOFFSET)offset == NOT_IN_PAD) |
| 1251 | return NOT_IN_PAD; |
| 1252 | |
| 1253 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
| 1254 | |
| 1255 | /* don't add new fake entries (via eval) to CVs that we have already |
| 1256 | * finished compiling, or to undef CVs */ |
| 1257 | if (CvCOMPILED(cv) || !padlist) |
| 1258 | return 0; /* this dummy (and invalid) value isnt used by the caller */ |
| 1259 | |
| 1260 | { |
| 1261 | /* This relies on sv_setsv_flags() upgrading the destination to the same |
| 1262 | type as the source, independent of the flags set, and on it being |
| 1263 | "good" and only copying flag bits and pointers that it understands. |
| 1264 | */ |
| 1265 | SV *new_namesv = newSVsv(*out_name_sv); |
| 1266 | AV * const ocomppad_name = PL_comppad_name; |
| 1267 | PAD * const ocomppad = PL_comppad; |
| 1268 | PL_comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
| 1269 | PL_comppad = MUTABLE_AV(AvARRAY(padlist)[1]); |
| 1270 | PL_curpad = AvARRAY(PL_comppad); |
| 1271 | |
| 1272 | new_offset |
| 1273 | = pad_alloc_name(new_namesv, |
| 1274 | (SvPAD_STATE(*out_name_sv) ? padadd_STATE : 0), |
| 1275 | SvPAD_TYPED(*out_name_sv) |
| 1276 | ? SvSTASH(*out_name_sv) : NULL, |
| 1277 | SvOURSTASH(*out_name_sv) |
| 1278 | ); |
| 1279 | |
| 1280 | SvFAKE_on(new_namesv); |
| 1281 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1282 | "Pad addname: %ld \"%.*s\" FAKE\n", |
| 1283 | (long)new_offset, |
| 1284 | (int) SvCUR(new_namesv), SvPVX(new_namesv))); |
| 1285 | PARENT_FAKELEX_FLAGS_set(new_namesv, *out_flags); |
| 1286 | |
| 1287 | PARENT_PAD_INDEX_set(new_namesv, 0); |
| 1288 | if (SvPAD_OUR(new_namesv)) { |
| 1289 | NOOP; /* do nothing */ |
| 1290 | } |
| 1291 | else if (CvLATE(cv)) { |
| 1292 | /* delayed creation - just note the offset within parent pad */ |
| 1293 | PARENT_PAD_INDEX_set(new_namesv, offset); |
| 1294 | CvCLONE_on(cv); |
| 1295 | } |
| 1296 | else { |
| 1297 | /* immediate creation - capture outer value right now */ |
| 1298 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); |
| 1299 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1300 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", |
| 1301 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); |
| 1302 | } |
| 1303 | *out_name_sv = new_namesv; |
| 1304 | *out_flags = PARENT_FAKELEX_FLAGS(new_namesv); |
| 1305 | |
| 1306 | PL_comppad_name = ocomppad_name; |
| 1307 | PL_comppad = ocomppad; |
| 1308 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL; |
| 1309 | } |
| 1310 | return new_offset; |
| 1311 | } |
| 1312 | |
| 1313 | #ifdef DEBUGGING |
| 1314 | |
| 1315 | /* |
| 1316 | =for apidoc Am|SV *|pad_sv|PADOFFSET po |
| 1317 | |
| 1318 | Get the value at offset I<po> in the current (compiling or executing) pad. |
| 1319 | Use macro PAD_SV instead of calling this function directly. |
| 1320 | |
| 1321 | =cut |
| 1322 | */ |
| 1323 | |
| 1324 | SV * |
| 1325 | Perl_pad_sv(pTHX_ PADOFFSET po) |
| 1326 | { |
| 1327 | dVAR; |
| 1328 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
| 1329 | |
| 1330 | if (!po) |
| 1331 | Perl_croak(aTHX_ "panic: pad_sv po"); |
| 1332 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1333 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
| 1334 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
| 1335 | ); |
| 1336 | return PL_curpad[po]; |
| 1337 | } |
| 1338 | |
| 1339 | /* |
| 1340 | =for apidoc Am|void|pad_setsv|PADOFFSET po|SV *sv |
| 1341 | |
| 1342 | Set the value at offset I<po> in the current (compiling or executing) pad. |
| 1343 | Use the macro PAD_SETSV() rather than calling this function directly. |
| 1344 | |
| 1345 | =cut |
| 1346 | */ |
| 1347 | |
| 1348 | void |
| 1349 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
| 1350 | { |
| 1351 | dVAR; |
| 1352 | |
| 1353 | PERL_ARGS_ASSERT_PAD_SETSV; |
| 1354 | |
| 1355 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
| 1356 | |
| 1357 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1358 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
| 1359 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
| 1360 | ); |
| 1361 | PL_curpad[po] = sv; |
| 1362 | } |
| 1363 | |
| 1364 | #endif /* DEBUGGING */ |
| 1365 | |
| 1366 | /* |
| 1367 | =for apidoc m|void|pad_block_start|int full |
| 1368 | |
| 1369 | Update the pad compilation state variables on entry to a new block |
| 1370 | |
| 1371 | =cut |
| 1372 | */ |
| 1373 | |
| 1374 | /* XXX DAPM perhaps: |
| 1375 | * - integrate this in general state-saving routine ??? |
| 1376 | * - combine with the state-saving going on in pad_new ??? |
| 1377 | * - introduce a new SAVE type that does all this in one go ? |
| 1378 | */ |
| 1379 | |
| 1380 | void |
| 1381 | Perl_pad_block_start(pTHX_ int full) |
| 1382 | { |
| 1383 | dVAR; |
| 1384 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
| 1385 | SAVEI32(PL_comppad_name_floor); |
| 1386 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
| 1387 | if (full) |
| 1388 | PL_comppad_name_fill = PL_comppad_name_floor; |
| 1389 | if (PL_comppad_name_floor < 0) |
| 1390 | PL_comppad_name_floor = 0; |
| 1391 | SAVEI32(PL_min_intro_pending); |
| 1392 | SAVEI32(PL_max_intro_pending); |
| 1393 | PL_min_intro_pending = 0; |
| 1394 | SAVEI32(PL_comppad_name_fill); |
| 1395 | SAVEI32(PL_padix_floor); |
| 1396 | PL_padix_floor = PL_padix; |
| 1397 | PL_pad_reset_pending = FALSE; |
| 1398 | } |
| 1399 | |
| 1400 | /* |
| 1401 | =for apidoc m|U32|intro_my |
| 1402 | |
| 1403 | "Introduce" my variables to visible status. |
| 1404 | |
| 1405 | =cut |
| 1406 | */ |
| 1407 | |
| 1408 | U32 |
| 1409 | Perl_intro_my(pTHX) |
| 1410 | { |
| 1411 | dVAR; |
| 1412 | SV **svp; |
| 1413 | I32 i; |
| 1414 | U32 seq; |
| 1415 | |
| 1416 | ASSERT_CURPAD_ACTIVE("intro_my"); |
| 1417 | if (! PL_min_intro_pending) |
| 1418 | return PL_cop_seqmax; |
| 1419 | |
| 1420 | svp = AvARRAY(PL_comppad_name); |
| 1421 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
| 1422 | SV * const sv = svp[i]; |
| 1423 | |
| 1424 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) |
| 1425 | && COP_SEQ_RANGE_LOW(sv) == PERL_PADSEQ_INTRO) |
| 1426 | { |
| 1427 | COP_SEQ_RANGE_HIGH_set(sv, PERL_PADSEQ_INTRO); /* Don't know scope end yet. */ |
| 1428 | COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax); |
| 1429 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1430 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
| 1431 | (long)i, SvPVX_const(sv), |
| 1432 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
| 1433 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) |
| 1434 | ); |
| 1435 | } |
| 1436 | } |
| 1437 | seq = PL_cop_seqmax; |
| 1438 | PL_cop_seqmax++; |
| 1439 | if (PL_cop_seqmax == PERL_PADSEQ_INTRO) /* not a legal value */ |
| 1440 | PL_cop_seqmax++; |
| 1441 | PL_min_intro_pending = 0; |
| 1442 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
| 1443 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1444 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax))); |
| 1445 | |
| 1446 | return seq; |
| 1447 | } |
| 1448 | |
| 1449 | /* |
| 1450 | =for apidoc m|void|pad_leavemy |
| 1451 | |
| 1452 | Cleanup at end of scope during compilation: set the max seq number for |
| 1453 | lexicals in this scope and warn of any lexicals that never got introduced. |
| 1454 | |
| 1455 | =cut |
| 1456 | */ |
| 1457 | |
| 1458 | void |
| 1459 | Perl_pad_leavemy(pTHX) |
| 1460 | { |
| 1461 | dVAR; |
| 1462 | I32 off; |
| 1463 | SV * const * const svp = AvARRAY(PL_comppad_name); |
| 1464 | |
| 1465 | PL_pad_reset_pending = FALSE; |
| 1466 | |
| 1467 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
| 1468 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
| 1469 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
| 1470 | const SV * const sv = svp[off]; |
| 1471 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv)) |
| 1472 | Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), |
| 1473 | "%"SVf" never introduced", |
| 1474 | SVfARG(sv)); |
| 1475 | } |
| 1476 | } |
| 1477 | /* "Deintroduce" my variables that are leaving with this scope. */ |
| 1478 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
| 1479 | const SV * const sv = svp[off]; |
| 1480 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) |
| 1481 | && COP_SEQ_RANGE_HIGH(sv) == PERL_PADSEQ_INTRO) |
| 1482 | { |
| 1483 | COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax); |
| 1484 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1485 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
| 1486 | (long)off, SvPVX_const(sv), |
| 1487 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
| 1488 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) |
| 1489 | ); |
| 1490 | } |
| 1491 | } |
| 1492 | PL_cop_seqmax++; |
| 1493 | if (PL_cop_seqmax == PERL_PADSEQ_INTRO) /* not a legal value */ |
| 1494 | PL_cop_seqmax++; |
| 1495 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1496 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
| 1497 | } |
| 1498 | |
| 1499 | /* |
| 1500 | =for apidoc m|void|pad_swipe|PADOFFSET po|bool refadjust |
| 1501 | |
| 1502 | Abandon the tmp in the current pad at offset po and replace with a |
| 1503 | new one. |
| 1504 | |
| 1505 | =cut |
| 1506 | */ |
| 1507 | |
| 1508 | void |
| 1509 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
| 1510 | { |
| 1511 | dVAR; |
| 1512 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
| 1513 | if (!PL_curpad) |
| 1514 | return; |
| 1515 | if (AvARRAY(PL_comppad) != PL_curpad) |
| 1516 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
| 1517 | if (!po) |
| 1518 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
| 1519 | |
| 1520 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1521 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
| 1522 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
| 1523 | |
| 1524 | if (PL_curpad[po]) |
| 1525 | SvPADTMP_off(PL_curpad[po]); |
| 1526 | if (refadjust) |
| 1527 | SvREFCNT_dec(PL_curpad[po]); |
| 1528 | |
| 1529 | |
| 1530 | /* if pad tmps aren't shared between ops, then there's no need to |
| 1531 | * create a new tmp when an existing op is freed */ |
| 1532 | #ifdef USE_BROKEN_PAD_RESET |
| 1533 | PL_curpad[po] = newSV(0); |
| 1534 | SvPADTMP_on(PL_curpad[po]); |
| 1535 | #else |
| 1536 | PL_curpad[po] = &PL_sv_undef; |
| 1537 | #endif |
| 1538 | if ((I32)po < PL_padix) |
| 1539 | PL_padix = po - 1; |
| 1540 | } |
| 1541 | |
| 1542 | /* |
| 1543 | =for apidoc m|void|pad_reset |
| 1544 | |
| 1545 | Mark all the current temporaries for reuse |
| 1546 | |
| 1547 | =cut |
| 1548 | */ |
| 1549 | |
| 1550 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
| 1551 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
| 1552 | * on the stack by OPs that use them, there are several ways to get an alias |
| 1553 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
| 1554 | * We avoid doing this until we can think of a Better Way. |
| 1555 | * GSAR 97-10-29 */ |
| 1556 | static void |
| 1557 | S_pad_reset(pTHX) |
| 1558 | { |
| 1559 | dVAR; |
| 1560 | #ifdef USE_BROKEN_PAD_RESET |
| 1561 | if (AvARRAY(PL_comppad) != PL_curpad) |
| 1562 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
| 1563 | |
| 1564 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1565 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
| 1566 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
| 1567 | (long)PL_padix, (long)PL_padix_floor |
| 1568 | ) |
| 1569 | ); |
| 1570 | |
| 1571 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
| 1572 | register I32 po; |
| 1573 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
| 1574 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
| 1575 | SvPADTMP_off(PL_curpad[po]); |
| 1576 | } |
| 1577 | PL_padix = PL_padix_floor; |
| 1578 | } |
| 1579 | #endif |
| 1580 | PL_pad_reset_pending = FALSE; |
| 1581 | } |
| 1582 | |
| 1583 | /* |
| 1584 | =for apidoc Amx|void|pad_tidy|padtidy_type type |
| 1585 | |
| 1586 | Tidy up a pad at the end of compilation of the code to which it belongs. |
| 1587 | Jobs performed here are: remove most stuff from the pads of anonsub |
| 1588 | prototypes; give it a @_; mark temporaries as such. I<type> indicates |
| 1589 | the kind of subroutine: |
| 1590 | |
| 1591 | padtidy_SUB ordinary subroutine |
| 1592 | padtidy_SUBCLONE prototype for lexical closure |
| 1593 | padtidy_FORMAT format |
| 1594 | |
| 1595 | =cut |
| 1596 | */ |
| 1597 | |
| 1598 | /* XXX DAPM surely most of this stuff should be done properly |
| 1599 | * at the right time beforehand, rather than going around afterwards |
| 1600 | * cleaning up our mistakes ??? |
| 1601 | */ |
| 1602 | |
| 1603 | void |
| 1604 | Perl_pad_tidy(pTHX_ padtidy_type type) |
| 1605 | { |
| 1606 | dVAR; |
| 1607 | |
| 1608 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
| 1609 | |
| 1610 | /* If this CV has had any 'eval-capable' ops planted in it |
| 1611 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any |
| 1612 | * anon prototypes in the chain of CVs should be marked as cloneable, |
| 1613 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets |
| 1614 | * the right CvOUTSIDE. |
| 1615 | * If running with -d, *any* sub may potentially have an eval |
| 1616 | * executed within it. |
| 1617 | */ |
| 1618 | |
| 1619 | if (PL_cv_has_eval || PL_perldb) { |
| 1620 | const CV *cv; |
| 1621 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
| 1622 | if (cv != PL_compcv && CvCOMPILED(cv)) |
| 1623 | break; /* no need to mark already-compiled code */ |
| 1624 | if (CvANON(cv)) { |
| 1625 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1626 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); |
| 1627 | CvCLONE_on(cv); |
| 1628 | } |
| 1629 | } |
| 1630 | } |
| 1631 | |
| 1632 | /* extend curpad to match namepad */ |
| 1633 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
| 1634 | av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
| 1635 | |
| 1636 | if (type == padtidy_SUBCLONE) { |
| 1637 | SV * const * const namep = AvARRAY(PL_comppad_name); |
| 1638 | PADOFFSET ix; |
| 1639 | |
| 1640 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
| 1641 | SV *namesv; |
| 1642 | |
| 1643 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
| 1644 | continue; |
| 1645 | /* |
| 1646 | * The only things that a clonable function needs in its |
| 1647 | * pad are anonymous subs. |
| 1648 | * The rest are created anew during cloning. |
| 1649 | */ |
| 1650 | if (!((namesv = namep[ix]) != NULL && |
| 1651 | namesv != &PL_sv_undef && |
| 1652 | *SvPVX_const(namesv) == '&')) |
| 1653 | { |
| 1654 | SvREFCNT_dec(PL_curpad[ix]); |
| 1655 | PL_curpad[ix] = NULL; |
| 1656 | } |
| 1657 | } |
| 1658 | } |
| 1659 | else if (type == padtidy_SUB) { |
| 1660 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
| 1661 | AV * const av = newAV(); /* Will be @_ */ |
| 1662 | av_store(PL_comppad, 0, MUTABLE_SV(av)); |
| 1663 | AvREIFY_only(av); |
| 1664 | } |
| 1665 | |
| 1666 | if (type == padtidy_SUB || type == padtidy_FORMAT) { |
| 1667 | SV * const * const namep = AvARRAY(PL_comppad_name); |
| 1668 | PADOFFSET ix; |
| 1669 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
| 1670 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
| 1671 | continue; |
| 1672 | if (!SvPADMY(PL_curpad[ix])) { |
| 1673 | SvPADTMP_on(PL_curpad[ix]); |
| 1674 | } else if (!SvFAKE(namep[ix])) { |
| 1675 | /* This is a work around for how the current implementation of |
| 1676 | ?{ } blocks in regexps interacts with lexicals. |
| 1677 | |
| 1678 | One of our lexicals. |
| 1679 | Can't do this on all lexicals, otherwise sub baz() won't |
| 1680 | compile in |
| 1681 | |
| 1682 | my $foo; |
| 1683 | |
| 1684 | sub bar { ++$foo; } |
| 1685 | |
| 1686 | sub baz { ++$foo; } |
| 1687 | |
| 1688 | because completion of compiling &bar calling pad_tidy() |
| 1689 | would cause (top level) $foo to be marked as stale, and |
| 1690 | "no longer available". */ |
| 1691 | SvPADSTALE_on(PL_curpad[ix]); |
| 1692 | } |
| 1693 | } |
| 1694 | } |
| 1695 | PL_curpad = AvARRAY(PL_comppad); |
| 1696 | } |
| 1697 | |
| 1698 | /* |
| 1699 | =for apidoc m|void|pad_free|PADOFFSET po |
| 1700 | |
| 1701 | Free the SV at offset po in the current pad. |
| 1702 | |
| 1703 | =cut |
| 1704 | */ |
| 1705 | |
| 1706 | /* XXX DAPM integrate with pad_swipe ???? */ |
| 1707 | void |
| 1708 | Perl_pad_free(pTHX_ PADOFFSET po) |
| 1709 | { |
| 1710 | dVAR; |
| 1711 | ASSERT_CURPAD_LEGAL("pad_free"); |
| 1712 | if (!PL_curpad) |
| 1713 | return; |
| 1714 | if (AvARRAY(PL_comppad) != PL_curpad) |
| 1715 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
| 1716 | if (!po) |
| 1717 | Perl_croak(aTHX_ "panic: pad_free po"); |
| 1718 | |
| 1719 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1720 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
| 1721 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
| 1722 | ); |
| 1723 | |
| 1724 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
| 1725 | SvFLAGS(PL_curpad[po]) &= ~SVs_PADTMP; /* also clears SVs_PADSTALE */ |
| 1726 | } |
| 1727 | if ((I32)po < PL_padix) |
| 1728 | PL_padix = po - 1; |
| 1729 | } |
| 1730 | |
| 1731 | /* |
| 1732 | =for apidoc m|void|do_dump_pad|I32 level|PerlIO *file|PADLIST *padlist|int full |
| 1733 | |
| 1734 | Dump the contents of a padlist |
| 1735 | |
| 1736 | =cut |
| 1737 | */ |
| 1738 | |
| 1739 | void |
| 1740 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
| 1741 | { |
| 1742 | dVAR; |
| 1743 | const AV *pad_name; |
| 1744 | const AV *pad; |
| 1745 | SV **pname; |
| 1746 | SV **ppad; |
| 1747 | I32 ix; |
| 1748 | |
| 1749 | PERL_ARGS_ASSERT_DO_DUMP_PAD; |
| 1750 | |
| 1751 | if (!padlist) { |
| 1752 | return; |
| 1753 | } |
| 1754 | pad_name = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 0, FALSE)); |
| 1755 | pad = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 1, FALSE)); |
| 1756 | pname = AvARRAY(pad_name); |
| 1757 | ppad = AvARRAY(pad); |
| 1758 | Perl_dump_indent(aTHX_ level, file, |
| 1759 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
| 1760 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
| 1761 | ); |
| 1762 | |
| 1763 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
| 1764 | const SV *namesv = pname[ix]; |
| 1765 | if (namesv && namesv == &PL_sv_undef) { |
| 1766 | namesv = NULL; |
| 1767 | } |
| 1768 | if (namesv) { |
| 1769 | if (SvFAKE(namesv)) |
| 1770 | Perl_dump_indent(aTHX_ level+1, file, |
| 1771 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
| 1772 | (int) ix, |
| 1773 | PTR2UV(ppad[ix]), |
| 1774 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
| 1775 | SvPVX_const(namesv), |
| 1776 | (unsigned long)PARENT_FAKELEX_FLAGS(namesv), |
| 1777 | (unsigned long)PARENT_PAD_INDEX(namesv) |
| 1778 | |
| 1779 | ); |
| 1780 | else |
| 1781 | Perl_dump_indent(aTHX_ level+1, file, |
| 1782 | "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n", |
| 1783 | (int) ix, |
| 1784 | PTR2UV(ppad[ix]), |
| 1785 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
| 1786 | (unsigned long)COP_SEQ_RANGE_LOW(namesv), |
| 1787 | (unsigned long)COP_SEQ_RANGE_HIGH(namesv), |
| 1788 | SvPVX_const(namesv) |
| 1789 | ); |
| 1790 | } |
| 1791 | else if (full) { |
| 1792 | Perl_dump_indent(aTHX_ level+1, file, |
| 1793 | "%2d. 0x%"UVxf"<%lu>\n", |
| 1794 | (int) ix, |
| 1795 | PTR2UV(ppad[ix]), |
| 1796 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
| 1797 | ); |
| 1798 | } |
| 1799 | } |
| 1800 | } |
| 1801 | |
| 1802 | #ifdef DEBUGGING |
| 1803 | |
| 1804 | /* |
| 1805 | =for apidoc m|void|cv_dump|CV *cv|const char *title |
| 1806 | |
| 1807 | dump the contents of a CV |
| 1808 | |
| 1809 | =cut |
| 1810 | */ |
| 1811 | |
| 1812 | STATIC void |
| 1813 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
| 1814 | { |
| 1815 | dVAR; |
| 1816 | const CV * const outside = CvOUTSIDE(cv); |
| 1817 | AV* const padlist = CvPADLIST(cv); |
| 1818 | |
| 1819 | PERL_ARGS_ASSERT_CV_DUMP; |
| 1820 | |
| 1821 | PerlIO_printf(Perl_debug_log, |
| 1822 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
| 1823 | title, |
| 1824 | PTR2UV(cv), |
| 1825 | (CvANON(cv) ? "ANON" |
| 1826 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
| 1827 | : (cv == PL_main_cv) ? "MAIN" |
| 1828 | : CvUNIQUE(cv) ? "UNIQUE" |
| 1829 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
| 1830 | PTR2UV(outside), |
| 1831 | (!outside ? "null" |
| 1832 | : CvANON(outside) ? "ANON" |
| 1833 | : (outside == PL_main_cv) ? "MAIN" |
| 1834 | : CvUNIQUE(outside) ? "UNIQUE" |
| 1835 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
| 1836 | |
| 1837 | PerlIO_printf(Perl_debug_log, |
| 1838 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
| 1839 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
| 1840 | } |
| 1841 | |
| 1842 | #endif /* DEBUGGING */ |
| 1843 | |
| 1844 | /* |
| 1845 | =for apidoc Am|CV *|cv_clone|CV *proto |
| 1846 | |
| 1847 | Clone a CV, making a lexical closure. I<proto> supplies the prototype |
| 1848 | of the function: its code, pad structure, and other attributes. |
| 1849 | The prototype is combined with a capture of outer lexicals to which the |
| 1850 | code refers, which are taken from the currently-executing instance of |
| 1851 | the immediately surrounding code. |
| 1852 | |
| 1853 | =cut |
| 1854 | */ |
| 1855 | |
| 1856 | CV * |
| 1857 | Perl_cv_clone(pTHX_ CV *proto) |
| 1858 | { |
| 1859 | dVAR; |
| 1860 | I32 ix; |
| 1861 | AV* const protopadlist = CvPADLIST(proto); |
| 1862 | const AV *const protopad_name = (const AV *)*av_fetch(protopadlist, 0, FALSE); |
| 1863 | const AV *const protopad = (const AV *)*av_fetch(protopadlist, 1, FALSE); |
| 1864 | SV** const pname = AvARRAY(protopad_name); |
| 1865 | SV** const ppad = AvARRAY(protopad); |
| 1866 | const I32 fname = AvFILLp(protopad_name); |
| 1867 | const I32 fpad = AvFILLp(protopad); |
| 1868 | CV* cv; |
| 1869 | SV** outpad; |
| 1870 | CV* outside; |
| 1871 | long depth; |
| 1872 | |
| 1873 | PERL_ARGS_ASSERT_CV_CLONE; |
| 1874 | |
| 1875 | assert(!CvUNIQUE(proto)); |
| 1876 | |
| 1877 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
| 1878 | * to a prototype; we instead want the cloned parent who called us. |
| 1879 | * Note that in general for formats, CvOUTSIDE != find_runcv */ |
| 1880 | |
| 1881 | outside = CvOUTSIDE(proto); |
| 1882 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) |
| 1883 | outside = find_runcv(NULL); |
| 1884 | depth = CvDEPTH(outside); |
| 1885 | assert(depth || SvTYPE(proto) == SVt_PVFM); |
| 1886 | if (!depth) |
| 1887 | depth = 1; |
| 1888 | assert(CvPADLIST(outside)); |
| 1889 | |
| 1890 | ENTER; |
| 1891 | SAVESPTR(PL_compcv); |
| 1892 | |
| 1893 | cv = PL_compcv = MUTABLE_CV(newSV_type(SvTYPE(proto))); |
| 1894 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE|CVf_CVGV_RC); |
| 1895 | CvCLONED_on(cv); |
| 1896 | |
| 1897 | CvFILE(cv) = CvDYNFILE(proto) ? savepv(CvFILE(proto)) |
| 1898 | : CvFILE(proto); |
| 1899 | CvGV_set(cv,CvGV(proto)); |
| 1900 | CvSTASH_set(cv, CvSTASH(proto)); |
| 1901 | OP_REFCNT_LOCK; |
| 1902 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
| 1903 | OP_REFCNT_UNLOCK; |
| 1904 | CvSTART(cv) = CvSTART(proto); |
| 1905 | CvOUTSIDE(cv) = MUTABLE_CV(SvREFCNT_inc_simple(outside)); |
| 1906 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
| 1907 | |
| 1908 | if (SvPOK(proto)) |
| 1909 | sv_setpvn(MUTABLE_SV(cv), SvPVX_const(proto), SvCUR(proto)); |
| 1910 | |
| 1911 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
| 1912 | |
| 1913 | av_fill(PL_comppad, fpad); |
| 1914 | for (ix = fname; ix > 0; ix--) |
| 1915 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
| 1916 | |
| 1917 | PL_curpad = AvARRAY(PL_comppad); |
| 1918 | |
| 1919 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
| 1920 | |
| 1921 | for (ix = fpad; ix > 0; ix--) { |
| 1922 | SV* const namesv = (ix <= fname) ? pname[ix] : NULL; |
| 1923 | SV *sv = NULL; |
| 1924 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
| 1925 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
| 1926 | sv = outpad[PARENT_PAD_INDEX(namesv)]; |
| 1927 | assert(sv); |
| 1928 | /* formats may have an inactive parent, |
| 1929 | while my $x if $false can leave an active var marked as |
| 1930 | stale. And state vars are always available */ |
| 1931 | if (SvPADSTALE(sv) && !SvPAD_STATE(namesv)) { |
| 1932 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
| 1933 | "Variable \"%"SVf"\" is not available", namesv); |
| 1934 | sv = NULL; |
| 1935 | } |
| 1936 | else |
| 1937 | SvREFCNT_inc_simple_void_NN(sv); |
| 1938 | } |
| 1939 | if (!sv) { |
| 1940 | const char sigil = SvPVX_const(namesv)[0]; |
| 1941 | if (sigil == '&') |
| 1942 | sv = SvREFCNT_inc(ppad[ix]); |
| 1943 | else if (sigil == '@') |
| 1944 | sv = MUTABLE_SV(newAV()); |
| 1945 | else if (sigil == '%') |
| 1946 | sv = MUTABLE_SV(newHV()); |
| 1947 | else |
| 1948 | sv = newSV(0); |
| 1949 | SvPADMY_on(sv); |
| 1950 | /* reset the 'assign only once' flag on each state var */ |
| 1951 | if (SvPAD_STATE(namesv)) |
| 1952 | SvPADSTALE_on(sv); |
| 1953 | } |
| 1954 | } |
| 1955 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
| 1956 | sv = SvREFCNT_inc_NN(ppad[ix]); |
| 1957 | } |
| 1958 | else { |
| 1959 | sv = newSV(0); |
| 1960 | SvPADTMP_on(sv); |
| 1961 | } |
| 1962 | PL_curpad[ix] = sv; |
| 1963 | } |
| 1964 | |
| 1965 | DEBUG_Xv( |
| 1966 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
| 1967 | cv_dump(outside, "Outside"); |
| 1968 | cv_dump(proto, "Proto"); |
| 1969 | cv_dump(cv, "To"); |
| 1970 | ); |
| 1971 | |
| 1972 | LEAVE; |
| 1973 | |
| 1974 | if (CvCONST(cv)) { |
| 1975 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
| 1976 | * The prototype was marked as a candiate for const-ization, |
| 1977 | * so try to grab the current const value, and if successful, |
| 1978 | * turn into a const sub: |
| 1979 | */ |
| 1980 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
| 1981 | if (const_sv) { |
| 1982 | SvREFCNT_dec(cv); |
| 1983 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); |
| 1984 | } |
| 1985 | else { |
| 1986 | CvCONST_off(cv); |
| 1987 | } |
| 1988 | } |
| 1989 | |
| 1990 | return cv; |
| 1991 | } |
| 1992 | |
| 1993 | /* |
| 1994 | =for apidoc m|void|pad_fixup_inner_anons|PADLIST *padlist|CV *old_cv|CV *new_cv |
| 1995 | |
| 1996 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
| 1997 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
| 1998 | moved to a pre-existing CV struct. |
| 1999 | |
| 2000 | =cut |
| 2001 | */ |
| 2002 | |
| 2003 | void |
| 2004 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
| 2005 | { |
| 2006 | dVAR; |
| 2007 | I32 ix; |
| 2008 | AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
| 2009 | AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]); |
| 2010 | SV ** const namepad = AvARRAY(comppad_name); |
| 2011 | SV ** const curpad = AvARRAY(comppad); |
| 2012 | |
| 2013 | PERL_ARGS_ASSERT_PAD_FIXUP_INNER_ANONS; |
| 2014 | PERL_UNUSED_ARG(old_cv); |
| 2015 | |
| 2016 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
| 2017 | const SV * const namesv = namepad[ix]; |
| 2018 | if (namesv && namesv != &PL_sv_undef |
| 2019 | && *SvPVX_const(namesv) == '&') |
| 2020 | { |
| 2021 | CV * const innercv = MUTABLE_CV(curpad[ix]); |
| 2022 | assert(CvWEAKOUTSIDE(innercv)); |
| 2023 | assert(CvOUTSIDE(innercv) == old_cv); |
| 2024 | CvOUTSIDE(innercv) = new_cv; |
| 2025 | } |
| 2026 | } |
| 2027 | } |
| 2028 | |
| 2029 | /* |
| 2030 | =for apidoc m|void|pad_push|PADLIST *padlist|int depth |
| 2031 | |
| 2032 | Push a new pad frame onto the padlist, unless there's already a pad at |
| 2033 | this depth, in which case don't bother creating a new one. Then give |
| 2034 | the new pad an @_ in slot zero. |
| 2035 | |
| 2036 | =cut |
| 2037 | */ |
| 2038 | |
| 2039 | void |
| 2040 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
| 2041 | { |
| 2042 | dVAR; |
| 2043 | |
| 2044 | PERL_ARGS_ASSERT_PAD_PUSH; |
| 2045 | |
| 2046 | if (depth > AvFILLp(padlist)) { |
| 2047 | SV** const svp = AvARRAY(padlist); |
| 2048 | AV* const newpad = newAV(); |
| 2049 | SV** const oldpad = AvARRAY(svp[depth-1]); |
| 2050 | I32 ix = AvFILLp((const AV *)svp[1]); |
| 2051 | const I32 names_fill = AvFILLp((const AV *)svp[0]); |
| 2052 | SV** const names = AvARRAY(svp[0]); |
| 2053 | AV *av; |
| 2054 | |
| 2055 | for ( ;ix > 0; ix--) { |
| 2056 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
| 2057 | const char sigil = SvPVX_const(names[ix])[0]; |
| 2058 | if ((SvFLAGS(names[ix]) & SVf_FAKE) |
| 2059 | || (SvFLAGS(names[ix]) & SVpad_STATE) |
| 2060 | || sigil == '&') |
| 2061 | { |
| 2062 | /* outer lexical or anon code */ |
| 2063 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
| 2064 | } |
| 2065 | else { /* our own lexical */ |
| 2066 | SV *sv; |
| 2067 | if (sigil == '@') |
| 2068 | sv = MUTABLE_SV(newAV()); |
| 2069 | else if (sigil == '%') |
| 2070 | sv = MUTABLE_SV(newHV()); |
| 2071 | else |
| 2072 | sv = newSV(0); |
| 2073 | av_store(newpad, ix, sv); |
| 2074 | SvPADMY_on(sv); |
| 2075 | } |
| 2076 | } |
| 2077 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
| 2078 | av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix])); |
| 2079 | } |
| 2080 | else { |
| 2081 | /* save temporaries on recursion? */ |
| 2082 | SV * const sv = newSV(0); |
| 2083 | av_store(newpad, ix, sv); |
| 2084 | SvPADTMP_on(sv); |
| 2085 | } |
| 2086 | } |
| 2087 | av = newAV(); |
| 2088 | av_store(newpad, 0, MUTABLE_SV(av)); |
| 2089 | AvREIFY_only(av); |
| 2090 | |
| 2091 | av_store(padlist, depth, MUTABLE_SV(newpad)); |
| 2092 | AvFILLp(padlist) = depth; |
| 2093 | } |
| 2094 | } |
| 2095 | |
| 2096 | /* |
| 2097 | =for apidoc Am|HV *|pad_compname_type|PADOFFSET po |
| 2098 | |
| 2099 | Looks up the type of the lexical variable at position I<po> in the |
| 2100 | currently-compiling pad. If the variable is typed, the stash of the |
| 2101 | class to which it is typed is returned. If not, C<NULL> is returned. |
| 2102 | |
| 2103 | =cut |
| 2104 | */ |
| 2105 | |
| 2106 | HV * |
| 2107 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) |
| 2108 | { |
| 2109 | dVAR; |
| 2110 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
| 2111 | if ( SvPAD_TYPED(*av) ) { |
| 2112 | return SvSTASH(*av); |
| 2113 | } |
| 2114 | return NULL; |
| 2115 | } |
| 2116 | |
| 2117 | #if defined(USE_ITHREADS) |
| 2118 | |
| 2119 | # define av_dup_inc(s,t) MUTABLE_AV(sv_dup_inc((const SV *)s,t)) |
| 2120 | |
| 2121 | /* |
| 2122 | =for apidoc m|AV *|padlist_dup|AV *srcpad|CLONE_PARAMS *param |
| 2123 | |
| 2124 | Duplicates a pad. |
| 2125 | |
| 2126 | =cut |
| 2127 | */ |
| 2128 | |
| 2129 | AV * |
| 2130 | Perl_padlist_dup(pTHX_ AV *srcpad, CLONE_PARAMS *param) |
| 2131 | { |
| 2132 | AV *dstpad; |
| 2133 | PERL_ARGS_ASSERT_PADLIST_DUP; |
| 2134 | |
| 2135 | if (!srcpad) |
| 2136 | return NULL; |
| 2137 | |
| 2138 | if (param->flags & CLONEf_COPY_STACKS |
| 2139 | || SvREFCNT(AvARRAY(srcpad)[1]) > 1) { |
| 2140 | dstpad = av_dup_inc(srcpad, param); |
| 2141 | assert (SvREFCNT(AvARRAY(srcpad)[1]) == 1); |
| 2142 | } else { |
| 2143 | /* CvDEPTH() on our subroutine will be set to 0, so there's no need |
| 2144 | to build anything other than the first level of pads. */ |
| 2145 | |
| 2146 | I32 ix = AvFILLp((const AV *)AvARRAY(srcpad)[1]); |
| 2147 | AV *pad1; |
| 2148 | const I32 names_fill = AvFILLp((const AV *)(AvARRAY(srcpad)[0])); |
| 2149 | const AV *const srcpad1 = (const AV *) AvARRAY(srcpad)[1]; |
| 2150 | SV **oldpad = AvARRAY(srcpad1); |
| 2151 | SV **names; |
| 2152 | SV **pad1a; |
| 2153 | AV *args; |
| 2154 | /* Look for it in the table first, as the padlist may have ended up |
| 2155 | as an element of @DB::args (or theoretically even @_), so it may |
| 2156 | may have been cloned already. It may also be there because of |
| 2157 | how Perl_sv_compile_2op() "works". :-( */ |
| 2158 | dstpad = (AV*)ptr_table_fetch(PL_ptr_table, srcpad); |
| 2159 | |
| 2160 | if (dstpad) |
| 2161 | return (AV *)SvREFCNT_inc_simple_NN(dstpad); |
| 2162 | |
| 2163 | dstpad = newAV(); |
| 2164 | ptr_table_store(PL_ptr_table, srcpad, dstpad); |
| 2165 | av_extend(dstpad, 1); |
| 2166 | AvARRAY(dstpad)[0] = MUTABLE_SV(av_dup_inc(AvARRAY(srcpad)[0], param)); |
| 2167 | names = AvARRAY(AvARRAY(dstpad)[0]); |
| 2168 | |
| 2169 | pad1 = newAV(); |
| 2170 | |
| 2171 | av_extend(pad1, ix); |
| 2172 | AvARRAY(dstpad)[1] = MUTABLE_SV(pad1); |
| 2173 | pad1a = AvARRAY(pad1); |
| 2174 | AvFILLp(dstpad) = 1; |
| 2175 | |
| 2176 | if (ix > -1) { |
| 2177 | AvFILLp(pad1) = ix; |
| 2178 | |
| 2179 | for ( ;ix > 0; ix--) { |
| 2180 | if (!oldpad[ix]) { |
| 2181 | pad1a[ix] = NULL; |
| 2182 | } else if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
| 2183 | const char sigil = SvPVX_const(names[ix])[0]; |
| 2184 | if ((SvFLAGS(names[ix]) & SVf_FAKE) |
| 2185 | || (SvFLAGS(names[ix]) & SVpad_STATE) |
| 2186 | || sigil == '&') |
| 2187 | { |
| 2188 | /* outer lexical or anon code */ |
| 2189 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); |
| 2190 | } |
| 2191 | else { /* our own lexical */ |
| 2192 | if(SvPADSTALE(oldpad[ix]) && SvREFCNT(oldpad[ix]) > 1) { |
| 2193 | /* This is a work around for how the current |
| 2194 | implementation of ?{ } blocks in regexps |
| 2195 | interacts with lexicals. */ |
| 2196 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); |
| 2197 | } else { |
| 2198 | SV *sv; |
| 2199 | |
| 2200 | if (sigil == '@') |
| 2201 | sv = MUTABLE_SV(newAV()); |
| 2202 | else if (sigil == '%') |
| 2203 | sv = MUTABLE_SV(newHV()); |
| 2204 | else |
| 2205 | sv = newSV(0); |
| 2206 | pad1a[ix] = sv; |
| 2207 | SvPADMY_on(sv); |
| 2208 | } |
| 2209 | } |
| 2210 | } |
| 2211 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
| 2212 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); |
| 2213 | } |
| 2214 | else { |
| 2215 | /* save temporaries on recursion? */ |
| 2216 | SV * const sv = newSV(0); |
| 2217 | pad1a[ix] = sv; |
| 2218 | |
| 2219 | /* SvREFCNT(oldpad[ix]) != 1 for some code in threads.xs |
| 2220 | FIXTHAT before merging this branch. |
| 2221 | (And I know how to) */ |
| 2222 | if (SvPADMY(oldpad[ix])) |
| 2223 | SvPADMY_on(sv); |
| 2224 | else |
| 2225 | SvPADTMP_on(sv); |
| 2226 | } |
| 2227 | } |
| 2228 | |
| 2229 | if (oldpad[0]) { |
| 2230 | args = newAV(); /* Will be @_ */ |
| 2231 | AvREIFY_only(args); |
| 2232 | pad1a[0] = (SV *)args; |
| 2233 | } |
| 2234 | } |
| 2235 | } |
| 2236 | |
| 2237 | return dstpad; |
| 2238 | } |
| 2239 | |
| 2240 | #endif /* USE_ITHREADS */ |
| 2241 | |
| 2242 | /* |
| 2243 | * Local variables: |
| 2244 | * c-indentation-style: bsd |
| 2245 | * c-basic-offset: 4 |
| 2246 | * indent-tabs-mode: t |
| 2247 | * End: |
| 2248 | * |
| 2249 | * ex: set ts=8 sts=4 sw=4 noet: |
| 2250 | */ |