| 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 | This file contains the functions that create and manipulate scratchpads, |
| 31 | which are array-of-array data structures attached to a CV (ie a sub) |
| 32 | and which store lexical variables and opcode temporary and per-thread |
| 33 | values. |
| 34 | |
| 35 | =for apidoc m|AV *|CvPADLIST|CV *cv |
| 36 | CV's can have CvPADLIST(cv) set to point to an AV. |
| 37 | |
| 38 | For these purposes "forms" are a kind-of CV, eval""s are too (except they're |
| 39 | not callable at will and are always thrown away after the eval"" is done |
| 40 | executing). Require'd files are simply evals without any outer lexical |
| 41 | scope. |
| 42 | |
| 43 | XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, |
| 44 | but that is really the callers pad (a slot of which is allocated by |
| 45 | every entersub). |
| 46 | |
| 47 | The CvPADLIST AV has does not have AvREAL set, so REFCNT of component items |
| 48 | is managed "manual" (mostly in pad.c) rather than normal av.c rules. |
| 49 | The items in the AV are not SVs as for a normal AV, but other AVs: |
| 50 | |
| 51 | 0'th Entry of the CvPADLIST is an AV which represents the "names" or rather |
| 52 | the "static type information" for lexicals. |
| 53 | |
| 54 | The CvDEPTH'th entry of CvPADLIST AV is an AV which is the stack frame at that |
| 55 | depth of recursion into the CV. |
| 56 | The 0'th slot of a frame AV is an AV which is @_. |
| 57 | other entries are storage for variables and op targets. |
| 58 | |
| 59 | During compilation: |
| 60 | C<PL_comppad_name> is set to the names AV. |
| 61 | C<PL_comppad> is set to the frame AV for the frame CvDEPTH == 1. |
| 62 | C<PL_curpad> is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). |
| 63 | |
| 64 | During execution, C<PL_comppad> and C<PL_curpad> refer to the live |
| 65 | frame of the currently executing sub. |
| 66 | |
| 67 | Iterating over the names AV iterates over all possible pad |
| 68 | items. Pad slots that are SVs_PADTMP (targets/GVs/constants) end up having |
| 69 | &PL_sv_undef "names" (see pad_alloc()). |
| 70 | |
| 71 | Only my/our variable (SVs_PADMY/SVs_PADOUR) slots get valid names. |
| 72 | The rest are op targets/GVs/constants which are statically allocated |
| 73 | or resolved at compile time. These don't have names by which they |
| 74 | can be looked up from Perl code at run time through eval"" like |
| 75 | my/our variables can be. Since they can't be looked up by "name" |
| 76 | but only by their index allocated at compile time (which is usually |
| 77 | in PL_op->op_targ), wasting a name SV for them doesn't make sense. |
| 78 | |
| 79 | The SVs in the names AV have their PV being the name of the variable. |
| 80 | xlow+1..xhigh inclusive in the NV union is a range of cop_seq numbers for |
| 81 | which the name is valid. For typed lexicals name SV is SVt_PVMG and SvSTASH |
| 82 | points at the type. For C<our> lexicals, the type is also SVt_PVMG, with the |
| 83 | SvOURSTASH slot pointing at the stash of the associated global (so that |
| 84 | duplicate C<our> declarations in the same package can be detected). SvUVX is |
| 85 | sometimes hijacked to store the generation number during compilation. |
| 86 | |
| 87 | If SvFAKE is set on the name SV, then that slot in the frame AV is |
| 88 | a REFCNT'ed reference to a lexical from "outside". In this case, |
| 89 | the name SV does not use xlow and xhigh to store a cop_seq range, since it is |
| 90 | in scope throughout. Instead xhigh stores some flags containing info about |
| 91 | the real lexical (is it declared in an anon, and is it capable of being |
| 92 | instantiated multiple times?), and for fake ANONs, xlow contains the index |
| 93 | within the parent's pad where the lexical's value is stored, to make |
| 94 | cloning quicker. |
| 95 | |
| 96 | If the 'name' is '&' the corresponding entry in frame AV |
| 97 | is a CV representing a possible closure. |
| 98 | (SvFAKE and name of '&' is not a meaningful combination currently but could |
| 99 | become so if C<my sub foo {}> is implemented.) |
| 100 | |
| 101 | Note that formats are treated as anon subs, and are cloned each time |
| 102 | write is called (if necessary). |
| 103 | |
| 104 | The flag SVs_PADSTALE is cleared on lexicals each time the my() is executed, |
| 105 | and set on scope exit. This allows the 'Variable $x is not available' warning |
| 106 | to be generated in evals, such as |
| 107 | |
| 108 | { my $x = 1; sub f { eval '$x'} } f(); |
| 109 | |
| 110 | For state vars, SVs_PADSTALE is overloaded to mean 'not yet initialised' |
| 111 | |
| 112 | =cut |
| 113 | */ |
| 114 | |
| 115 | |
| 116 | #include "EXTERN.h" |
| 117 | #define PERL_IN_PAD_C |
| 118 | #include "perl.h" |
| 119 | #include "keywords.h" |
| 120 | |
| 121 | #define COP_SEQ_RANGE_LOW_set(sv,val) \ |
| 122 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END |
| 123 | #define COP_SEQ_RANGE_HIGH_set(sv,val) \ |
| 124 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END |
| 125 | |
| 126 | #define PARENT_PAD_INDEX_set(sv,val) \ |
| 127 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xlow = (val); } STMT_END |
| 128 | #define PARENT_FAKELEX_FLAGS_set(sv,val) \ |
| 129 | STMT_START { ((XPVNV*)SvANY(sv))->xnv_u.xpad_cop_seq.xhigh = (val); } STMT_END |
| 130 | |
| 131 | #define PAD_MAX I32_MAX |
| 132 | |
| 133 | #ifdef PERL_MAD |
| 134 | void pad_peg(const char* s) { |
| 135 | static int pegcnt; |
| 136 | |
| 137 | PERL_ARGS_ASSERT_PAD_PEG; |
| 138 | |
| 139 | pegcnt++; |
| 140 | } |
| 141 | #endif |
| 142 | |
| 143 | /* |
| 144 | =for apidoc pad_new |
| 145 | |
| 146 | Create a new compiling padlist, saving and updating the various global |
| 147 | vars at the same time as creating the pad itself. The following flags |
| 148 | can be OR'ed together: |
| 149 | |
| 150 | padnew_CLONE this pad is for a cloned CV |
| 151 | padnew_SAVE save old globals |
| 152 | padnew_SAVESUB also save extra stuff for start of sub |
| 153 | |
| 154 | =cut |
| 155 | */ |
| 156 | |
| 157 | PADLIST * |
| 158 | Perl_pad_new(pTHX_ int flags) |
| 159 | { |
| 160 | dVAR; |
| 161 | AV *padlist, *padname, *pad; |
| 162 | |
| 163 | ASSERT_CURPAD_LEGAL("pad_new"); |
| 164 | |
| 165 | /* XXX DAPM really need a new SAVEt_PAD which restores all or most |
| 166 | * vars (based on flags) rather than storing vals + addresses for |
| 167 | * each individually. Also see pad_block_start. |
| 168 | * XXX DAPM Try to see whether all these conditionals are required |
| 169 | */ |
| 170 | |
| 171 | /* save existing state, ... */ |
| 172 | |
| 173 | if (flags & padnew_SAVE) { |
| 174 | SAVECOMPPAD(); |
| 175 | SAVESPTR(PL_comppad_name); |
| 176 | if (! (flags & padnew_CLONE)) { |
| 177 | SAVEI32(PL_padix); |
| 178 | SAVEI32(PL_comppad_name_fill); |
| 179 | SAVEI32(PL_min_intro_pending); |
| 180 | SAVEI32(PL_max_intro_pending); |
| 181 | SAVEBOOL(PL_cv_has_eval); |
| 182 | if (flags & padnew_SAVESUB) { |
| 183 | SAVEBOOL(PL_pad_reset_pending); |
| 184 | } |
| 185 | } |
| 186 | } |
| 187 | /* XXX DAPM interestingly, PL_comppad_name_floor never seems to be |
| 188 | * saved - check at some pt that this is okay */ |
| 189 | |
| 190 | /* ... create new pad ... */ |
| 191 | |
| 192 | padlist = newAV(); |
| 193 | padname = newAV(); |
| 194 | pad = newAV(); |
| 195 | |
| 196 | if (flags & padnew_CLONE) { |
| 197 | /* XXX DAPM I dont know why cv_clone needs it |
| 198 | * doing differently yet - perhaps this separate branch can be |
| 199 | * dispensed with eventually ??? |
| 200 | */ |
| 201 | |
| 202 | AV * const a0 = newAV(); /* will be @_ */ |
| 203 | av_store(pad, 0, MUTABLE_SV(a0)); |
| 204 | AvREIFY_only(a0); |
| 205 | } |
| 206 | else { |
| 207 | av_store(pad, 0, NULL); |
| 208 | } |
| 209 | |
| 210 | AvREAL_off(padlist); |
| 211 | av_store(padlist, 0, MUTABLE_SV(padname)); |
| 212 | av_store(padlist, 1, MUTABLE_SV(pad)); |
| 213 | |
| 214 | /* ... then update state variables */ |
| 215 | |
| 216 | PL_comppad_name = MUTABLE_AV((*av_fetch(padlist, 0, FALSE))); |
| 217 | PL_comppad = MUTABLE_AV((*av_fetch(padlist, 1, FALSE))); |
| 218 | PL_curpad = AvARRAY(PL_comppad); |
| 219 | |
| 220 | if (! (flags & padnew_CLONE)) { |
| 221 | PL_comppad_name_fill = 0; |
| 222 | PL_min_intro_pending = 0; |
| 223 | PL_padix = 0; |
| 224 | PL_cv_has_eval = 0; |
| 225 | } |
| 226 | |
| 227 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 228 | "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf |
| 229 | " name=0x%"UVxf" flags=0x%"UVxf"\n", |
| 230 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), |
| 231 | PTR2UV(padname), (UV)flags |
| 232 | ) |
| 233 | ); |
| 234 | |
| 235 | return (PADLIST*)padlist; |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | =for apidoc pad_undef |
| 240 | |
| 241 | Free the padlist associated with a CV. |
| 242 | If parts of it happen to be current, we null the relevant |
| 243 | PL_*pad* global vars so that we don't have any dangling references left. |
| 244 | We also repoint the CvOUTSIDE of any about-to-be-orphaned |
| 245 | inner subs to the outer of this cv. |
| 246 | |
| 247 | (This function should really be called pad_free, but the name was already |
| 248 | taken) |
| 249 | |
| 250 | =cut |
| 251 | */ |
| 252 | |
| 253 | void |
| 254 | Perl_pad_undef(pTHX_ CV* cv) |
| 255 | { |
| 256 | dVAR; |
| 257 | I32 ix; |
| 258 | const PADLIST * const padlist = CvPADLIST(cv); |
| 259 | |
| 260 | PERL_ARGS_ASSERT_PAD_UNDEF; |
| 261 | |
| 262 | pad_peg("pad_undef"); |
| 263 | if (!padlist) |
| 264 | return; |
| 265 | if (SvIS_FREED(padlist)) /* may be during global destruction */ |
| 266 | return; |
| 267 | |
| 268 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 269 | "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf" comppad=0x%"UVxf"\n", |
| 270 | PTR2UV(cv), PTR2UV(padlist), PTR2UV(PL_comppad)) |
| 271 | ); |
| 272 | |
| 273 | /* detach any '&' anon children in the pad; if afterwards they |
| 274 | * are still live, fix up their CvOUTSIDEs to point to our outside, |
| 275 | * bypassing us. */ |
| 276 | /* XXX DAPM for efficiency, we should only do this if we know we have |
| 277 | * children, or integrate this loop with general cleanup */ |
| 278 | |
| 279 | if (!PL_dirty) { /* don't bother during global destruction */ |
| 280 | CV * const outercv = CvOUTSIDE(cv); |
| 281 | const U32 seq = CvOUTSIDE_SEQ(cv); |
| 282 | AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
| 283 | SV ** const namepad = AvARRAY(comppad_name); |
| 284 | AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]); |
| 285 | SV ** const curpad = AvARRAY(comppad); |
| 286 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
| 287 | SV * const namesv = namepad[ix]; |
| 288 | if (namesv && namesv != &PL_sv_undef |
| 289 | && *SvPVX_const(namesv) == '&') |
| 290 | { |
| 291 | CV * const innercv = MUTABLE_CV(curpad[ix]); |
| 292 | U32 inner_rc = SvREFCNT(innercv); |
| 293 | assert(inner_rc); |
| 294 | namepad[ix] = NULL; |
| 295 | SvREFCNT_dec(namesv); |
| 296 | |
| 297 | if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ |
| 298 | curpad[ix] = NULL; |
| 299 | SvREFCNT_dec(innercv); |
| 300 | inner_rc--; |
| 301 | } |
| 302 | |
| 303 | /* in use, not just a prototype */ |
| 304 | if (inner_rc && (CvOUTSIDE(innercv) == cv)) { |
| 305 | assert(CvWEAKOUTSIDE(innercv)); |
| 306 | /* don't relink to grandfather if he's being freed */ |
| 307 | if (outercv && SvREFCNT(outercv)) { |
| 308 | CvWEAKOUTSIDE_off(innercv); |
| 309 | CvOUTSIDE(innercv) = outercv; |
| 310 | CvOUTSIDE_SEQ(innercv) = seq; |
| 311 | SvREFCNT_inc_simple_void_NN(outercv); |
| 312 | } |
| 313 | else { |
| 314 | CvOUTSIDE(innercv) = NULL; |
| 315 | } |
| 316 | } |
| 317 | } |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | ix = AvFILLp(padlist); |
| 322 | while (ix >= 0) { |
| 323 | SV* const sv = AvARRAY(padlist)[ix--]; |
| 324 | if (sv) { |
| 325 | if (sv == (const SV *)PL_comppad_name) |
| 326 | PL_comppad_name = NULL; |
| 327 | else if (sv == (const SV *)PL_comppad) { |
| 328 | PL_comppad = NULL; |
| 329 | PL_curpad = NULL; |
| 330 | } |
| 331 | } |
| 332 | SvREFCNT_dec(sv); |
| 333 | } |
| 334 | SvREFCNT_dec(MUTABLE_SV(CvPADLIST(cv))); |
| 335 | CvPADLIST(cv) = NULL; |
| 336 | } |
| 337 | |
| 338 | |
| 339 | |
| 340 | |
| 341 | static PADOFFSET |
| 342 | S_pad_add_name_sv(pTHX_ SV *namesv, const U32 flags, HV *typestash, |
| 343 | HV *ourstash) |
| 344 | { |
| 345 | dVAR; |
| 346 | const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); |
| 347 | |
| 348 | PERL_ARGS_ASSERT_PAD_ADD_NAME_SV; |
| 349 | |
| 350 | ASSERT_CURPAD_ACTIVE("pad_add_name"); |
| 351 | |
| 352 | if (typestash) { |
| 353 | assert(SvTYPE(namesv) == SVt_PVMG); |
| 354 | SvPAD_TYPED_on(namesv); |
| 355 | SvSTASH_set(namesv, MUTABLE_HV(SvREFCNT_inc_simple_NN(MUTABLE_SV(typestash)))); |
| 356 | } |
| 357 | if (ourstash) { |
| 358 | SvPAD_OUR_on(namesv); |
| 359 | SvOURSTASH_set(namesv, ourstash); |
| 360 | SvREFCNT_inc_simple_void_NN(ourstash); |
| 361 | } |
| 362 | else if (flags & padadd_STATE) { |
| 363 | SvPAD_STATE_on(namesv); |
| 364 | } |
| 365 | |
| 366 | av_store(PL_comppad_name, offset, namesv); |
| 367 | return offset; |
| 368 | } |
| 369 | |
| 370 | /* |
| 371 | =for apidoc pad_add_name |
| 372 | |
| 373 | Create a new name and associated PADMY SV in the current pad; return the |
| 374 | offset. |
| 375 | If C<typestash> is valid, the name is for a typed lexical; set the |
| 376 | name's stash to that value. |
| 377 | If C<ourstash> is valid, it's an our lexical, set the name's |
| 378 | SvOURSTASH to that value |
| 379 | |
| 380 | If fake, it means we're cloning an existing entry |
| 381 | |
| 382 | =cut |
| 383 | */ |
| 384 | |
| 385 | PADOFFSET |
| 386 | Perl_pad_add_name(pTHX_ const char *name, const STRLEN len, const U32 flags, |
| 387 | HV *typestash, HV *ourstash) |
| 388 | { |
| 389 | dVAR; |
| 390 | PADOFFSET offset; |
| 391 | SV *namesv; |
| 392 | |
| 393 | PERL_ARGS_ASSERT_PAD_ADD_NAME; |
| 394 | |
| 395 | if (flags & ~(padadd_OUR|padadd_STATE|padadd_NO_DUP_CHECK)) |
| 396 | Perl_croak(aTHX_ "panic: pad_add_name illegal flag bits 0x%" UVxf, |
| 397 | (UV)flags); |
| 398 | |
| 399 | namesv = newSV_type((ourstash || typestash) ? SVt_PVMG : SVt_PVNV); |
| 400 | |
| 401 | /* Until we're using the length for real, cross check that we're being told |
| 402 | the truth. */ |
| 403 | PERL_UNUSED_ARG(len); |
| 404 | assert(strlen(name) == len); |
| 405 | |
| 406 | sv_setpv(namesv, name); |
| 407 | |
| 408 | if ((flags & padadd_NO_DUP_CHECK) == 0) { |
| 409 | /* check for duplicate declaration */ |
| 410 | pad_check_dup(namesv, flags & padadd_OUR, ourstash); |
| 411 | } |
| 412 | |
| 413 | offset = pad_add_name_sv(namesv, flags, typestash, ourstash); |
| 414 | |
| 415 | /* not yet introduced */ |
| 416 | COP_SEQ_RANGE_LOW_set(namesv, PAD_MAX); /* min */ |
| 417 | COP_SEQ_RANGE_HIGH_set(namesv, 0); /* max */ |
| 418 | |
| 419 | if (!PL_min_intro_pending) |
| 420 | PL_min_intro_pending = offset; |
| 421 | PL_max_intro_pending = offset; |
| 422 | /* if it's not a simple scalar, replace with an AV or HV */ |
| 423 | assert(SvTYPE(PL_curpad[offset]) == SVt_NULL); |
| 424 | assert(SvREFCNT(PL_curpad[offset]) == 1); |
| 425 | if (*name == '@') |
| 426 | sv_upgrade(PL_curpad[offset], SVt_PVAV); |
| 427 | else if (*name == '%') |
| 428 | sv_upgrade(PL_curpad[offset], SVt_PVHV); |
| 429 | assert(SvPADMY(PL_curpad[offset])); |
| 430 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 431 | "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", |
| 432 | (long)offset, name, PTR2UV(PL_curpad[offset]))); |
| 433 | |
| 434 | return offset; |
| 435 | } |
| 436 | |
| 437 | |
| 438 | |
| 439 | |
| 440 | /* |
| 441 | =for apidoc pad_alloc |
| 442 | |
| 443 | Allocate a new my or tmp pad entry. For a my, simply push a null SV onto |
| 444 | the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards |
| 445 | for a slot which has no name and no active value. |
| 446 | |
| 447 | =cut |
| 448 | */ |
| 449 | |
| 450 | /* XXX DAPM integrate alloc(), add_name() and add_anon(), |
| 451 | * or at least rationalise ??? */ |
| 452 | /* And flag whether the incoming name is UTF8 or 8 bit? |
| 453 | Could do this either with the +ve/-ve hack of the HV code, or expanding |
| 454 | the flag bits. Either way, this makes proper Unicode safe pad support. |
| 455 | NWC |
| 456 | */ |
| 457 | |
| 458 | PADOFFSET |
| 459 | Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) |
| 460 | { |
| 461 | dVAR; |
| 462 | SV *sv; |
| 463 | I32 retval; |
| 464 | |
| 465 | PERL_UNUSED_ARG(optype); |
| 466 | ASSERT_CURPAD_ACTIVE("pad_alloc"); |
| 467 | |
| 468 | if (AvARRAY(PL_comppad) != PL_curpad) |
| 469 | Perl_croak(aTHX_ "panic: pad_alloc"); |
| 470 | if (PL_pad_reset_pending) |
| 471 | pad_reset(); |
| 472 | if (tmptype & SVs_PADMY) { |
| 473 | sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); |
| 474 | retval = AvFILLp(PL_comppad); |
| 475 | } |
| 476 | else { |
| 477 | SV * const * const names = AvARRAY(PL_comppad_name); |
| 478 | const SSize_t names_fill = AvFILLp(PL_comppad_name); |
| 479 | for (;;) { |
| 480 | /* |
| 481 | * "foreach" index vars temporarily become aliases to non-"my" |
| 482 | * values. Thus we must skip, not just pad values that are |
| 483 | * marked as current pad values, but also those with names. |
| 484 | */ |
| 485 | /* HVDS why copy to sv here? we don't seem to use it */ |
| 486 | if (++PL_padix <= names_fill && |
| 487 | (sv = names[PL_padix]) && sv != &PL_sv_undef) |
| 488 | continue; |
| 489 | sv = *av_fetch(PL_comppad, PL_padix, TRUE); |
| 490 | if (!(SvFLAGS(sv) & (SVs_PADTMP | SVs_PADMY)) && |
| 491 | !IS_PADGV(sv) && !IS_PADCONST(sv)) |
| 492 | break; |
| 493 | } |
| 494 | retval = PL_padix; |
| 495 | } |
| 496 | SvFLAGS(sv) |= tmptype; |
| 497 | PL_curpad = AvARRAY(PL_comppad); |
| 498 | |
| 499 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 500 | "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", |
| 501 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, |
| 502 | PL_op_name[optype])); |
| 503 | #ifdef DEBUG_LEAKING_SCALARS |
| 504 | sv->sv_debug_optype = optype; |
| 505 | sv->sv_debug_inpad = 1; |
| 506 | #endif |
| 507 | return (PADOFFSET)retval; |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | =for apidoc pad_add_anon |
| 512 | |
| 513 | Add an anon code entry to the current compiling pad |
| 514 | |
| 515 | =cut |
| 516 | */ |
| 517 | |
| 518 | PADOFFSET |
| 519 | Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) |
| 520 | { |
| 521 | dVAR; |
| 522 | PADOFFSET ix; |
| 523 | SV* const name = newSV_type(SVt_PVNV); |
| 524 | |
| 525 | PERL_ARGS_ASSERT_PAD_ADD_ANON; |
| 526 | |
| 527 | pad_peg("add_anon"); |
| 528 | sv_setpvs(name, "&"); |
| 529 | /* Are these two actually ever read? */ |
| 530 | COP_SEQ_RANGE_HIGH_set(name, ~0); |
| 531 | COP_SEQ_RANGE_LOW_set(name, 1); |
| 532 | ix = pad_alloc(op_type, SVs_PADMY); |
| 533 | av_store(PL_comppad_name, ix, name); |
| 534 | /* XXX DAPM use PL_curpad[] ? */ |
| 535 | av_store(PL_comppad, ix, sv); |
| 536 | SvPADMY_on(sv); |
| 537 | |
| 538 | /* to avoid ref loops, we never have parent + child referencing each |
| 539 | * other simultaneously */ |
| 540 | if (CvOUTSIDE((const CV *)sv)) { |
| 541 | assert(!CvWEAKOUTSIDE((const CV *)sv)); |
| 542 | CvWEAKOUTSIDE_on(MUTABLE_CV(sv)); |
| 543 | SvREFCNT_dec(CvOUTSIDE(MUTABLE_CV(sv))); |
| 544 | } |
| 545 | return ix; |
| 546 | } |
| 547 | |
| 548 | |
| 549 | |
| 550 | /* |
| 551 | =for apidoc pad_check_dup |
| 552 | |
| 553 | Check for duplicate declarations: report any of: |
| 554 | * a my in the current scope with the same name; |
| 555 | * an our (anywhere in the pad) with the same name and the same stash |
| 556 | as C<ourstash> |
| 557 | C<is_our> indicates that the name to check is an 'our' declaration |
| 558 | |
| 559 | =cut |
| 560 | */ |
| 561 | |
| 562 | STATIC void |
| 563 | S_pad_check_dup(pTHX_ SV *name, const U32 flags, const HV *ourstash) |
| 564 | { |
| 565 | dVAR; |
| 566 | SV **svp; |
| 567 | PADOFFSET top, off; |
| 568 | const U32 is_our = flags & padadd_OUR; |
| 569 | |
| 570 | PERL_ARGS_ASSERT_PAD_CHECK_DUP; |
| 571 | |
| 572 | ASSERT_CURPAD_ACTIVE("pad_check_dup"); |
| 573 | |
| 574 | assert((flags & ~padadd_OUR) == 0); |
| 575 | |
| 576 | if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) |
| 577 | return; /* nothing to check */ |
| 578 | |
| 579 | svp = AvARRAY(PL_comppad_name); |
| 580 | top = AvFILLp(PL_comppad_name); |
| 581 | /* check the current scope */ |
| 582 | /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same |
| 583 | * type ? */ |
| 584 | for (off = top; (I32)off > PL_comppad_name_floor; off--) { |
| 585 | SV * const sv = svp[off]; |
| 586 | if (sv |
| 587 | && sv != &PL_sv_undef |
| 588 | && !SvFAKE(sv) |
| 589 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
| 590 | && sv_eq(name, sv)) |
| 591 | { |
| 592 | if (is_our && (SvPAD_OUR(sv))) |
| 593 | break; /* "our" masking "our" */ |
| 594 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
| 595 | "\"%s\" variable %"SVf" masks earlier declaration in same %s", |
| 596 | (is_our ? "our" : PL_parser->in_my == KEY_my ? "my" : "state"), |
| 597 | sv, |
| 598 | (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX ? "scope" : "statement")); |
| 599 | --off; |
| 600 | break; |
| 601 | } |
| 602 | } |
| 603 | /* check the rest of the pad */ |
| 604 | if (is_our) { |
| 605 | do { |
| 606 | SV * const sv = svp[off]; |
| 607 | if (sv |
| 608 | && sv != &PL_sv_undef |
| 609 | && !SvFAKE(sv) |
| 610 | && (COP_SEQ_RANGE_HIGH(sv) == PAD_MAX || COP_SEQ_RANGE_HIGH(sv) == 0) |
| 611 | && SvOURSTASH(sv) == ourstash |
| 612 | && sv_eq(name, sv)) |
| 613 | { |
| 614 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
| 615 | "\"our\" variable %"SVf" redeclared", sv); |
| 616 | if ((I32)off <= PL_comppad_name_floor) |
| 617 | Perl_warner(aTHX_ packWARN(WARN_MISC), |
| 618 | "\t(Did you mean \"local\" instead of \"our\"?)\n"); |
| 619 | break; |
| 620 | } |
| 621 | } while ( off-- > 0 ); |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | |
| 626 | /* |
| 627 | =for apidoc pad_findmy |
| 628 | |
| 629 | Given a lexical name, try to find its offset, first in the current pad, |
| 630 | or failing that, in the pads of any lexically enclosing subs (including |
| 631 | the complications introduced by eval). If the name is found in an outer pad, |
| 632 | then a fake entry is added to the current pad. |
| 633 | Returns the offset in the current pad, or NOT_IN_PAD on failure. |
| 634 | |
| 635 | =cut |
| 636 | */ |
| 637 | |
| 638 | PADOFFSET |
| 639 | Perl_pad_findmy(pTHX_ const char *name, STRLEN len, U32 flags) |
| 640 | { |
| 641 | dVAR; |
| 642 | SV *out_sv; |
| 643 | int out_flags; |
| 644 | I32 offset; |
| 645 | const AV *nameav; |
| 646 | SV **name_svp; |
| 647 | |
| 648 | PERL_ARGS_ASSERT_PAD_FINDMY; |
| 649 | |
| 650 | pad_peg("pad_findmy"); |
| 651 | |
| 652 | if (flags) |
| 653 | Perl_croak(aTHX_ "panic: pad_findmy illegal flag bits 0x%" UVxf, |
| 654 | (UV)flags); |
| 655 | |
| 656 | /* Yes, it is a bug (read work in progress) that we're not really using this |
| 657 | length parameter, and instead relying on strlen() later on. But I'm not |
| 658 | comfortable about changing the pad API piecemeal to use and rely on |
| 659 | lengths. This only exists to avoid an "unused parameter" warning. */ |
| 660 | if (len < 2) |
| 661 | return NOT_IN_PAD; |
| 662 | |
| 663 | /* But until we're using the length for real, cross check that we're being |
| 664 | told the truth. */ |
| 665 | assert(strlen(name) == len); |
| 666 | |
| 667 | offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, |
| 668 | NULL, &out_sv, &out_flags); |
| 669 | if ((PADOFFSET)offset != NOT_IN_PAD) |
| 670 | return offset; |
| 671 | |
| 672 | /* look for an our that's being introduced; this allows |
| 673 | * our $foo = 0 unless defined $foo; |
| 674 | * to not give a warning. (Yes, this is a hack) */ |
| 675 | |
| 676 | nameav = MUTABLE_AV(AvARRAY(CvPADLIST(PL_compcv))[0]); |
| 677 | name_svp = AvARRAY(nameav); |
| 678 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
| 679 | const SV * const namesv = name_svp[offset]; |
| 680 | if (namesv && namesv != &PL_sv_undef |
| 681 | && !SvFAKE(namesv) |
| 682 | && (SvPAD_OUR(namesv)) |
| 683 | && strEQ(SvPVX_const(namesv), name) |
| 684 | && COP_SEQ_RANGE_LOW(namesv) == PAD_MAX /* min */ |
| 685 | ) |
| 686 | return offset; |
| 687 | } |
| 688 | return NOT_IN_PAD; |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * Returns the offset of a lexical $_, if there is one, at run time. |
| 693 | * Used by the UNDERBAR XS macro. |
| 694 | */ |
| 695 | |
| 696 | PADOFFSET |
| 697 | Perl_find_rundefsvoffset(pTHX) |
| 698 | { |
| 699 | dVAR; |
| 700 | SV *out_sv; |
| 701 | int out_flags; |
| 702 | return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, |
| 703 | NULL, &out_sv, &out_flags); |
| 704 | } |
| 705 | |
| 706 | /* |
| 707 | * Returns a lexical $_, if there is one, at run time ; or the global one |
| 708 | * otherwise. |
| 709 | */ |
| 710 | |
| 711 | SV * |
| 712 | Perl_find_rundefsv(pTHX) |
| 713 | { |
| 714 | SV *namesv; |
| 715 | int flags; |
| 716 | PADOFFSET po; |
| 717 | |
| 718 | po = pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, |
| 719 | NULL, &namesv, &flags); |
| 720 | |
| 721 | if (po == NOT_IN_PAD |
| 722 | || (SvFLAGS(namesv) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR)) |
| 723 | return DEFSV; |
| 724 | |
| 725 | return PAD_SVl(po); |
| 726 | } |
| 727 | |
| 728 | /* |
| 729 | =for apidoc pad_findlex |
| 730 | |
| 731 | Find a named lexical anywhere in a chain of nested pads. Add fake entries |
| 732 | in the inner pads if it's found in an outer one. |
| 733 | |
| 734 | Returns the offset in the bottom pad of the lex or the fake lex. |
| 735 | cv is the CV in which to start the search, and seq is the current cop_seq |
| 736 | to match against. If warn is true, print appropriate warnings. The out_* |
| 737 | vars return values, and so are pointers to where the returned values |
| 738 | should be stored. out_capture, if non-null, requests that the innermost |
| 739 | instance of the lexical is captured; out_name_sv is set to the innermost |
| 740 | matched namesv or fake namesv; out_flags returns the flags normally |
| 741 | associated with the IVX field of a fake namesv. |
| 742 | |
| 743 | Note that pad_findlex() is recursive; it recurses up the chain of CVs, |
| 744 | then comes back down, adding fake entries as it goes. It has to be this way |
| 745 | because fake namesvs in anon protoypes have to store in xlow the index into |
| 746 | the parent pad. |
| 747 | |
| 748 | =cut |
| 749 | */ |
| 750 | |
| 751 | /* the CV has finished being compiled. This is not a sufficient test for |
| 752 | * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ |
| 753 | #define CvCOMPILED(cv) CvROOT(cv) |
| 754 | |
| 755 | /* the CV does late binding of its lexicals */ |
| 756 | #define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) |
| 757 | |
| 758 | |
| 759 | STATIC PADOFFSET |
| 760 | S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, |
| 761 | SV** out_capture, SV** out_name_sv, int *out_flags) |
| 762 | { |
| 763 | dVAR; |
| 764 | I32 offset, new_offset; |
| 765 | SV *new_capture; |
| 766 | SV **new_capturep; |
| 767 | const AV * const padlist = CvPADLIST(cv); |
| 768 | |
| 769 | PERL_ARGS_ASSERT_PAD_FINDLEX; |
| 770 | |
| 771 | *out_flags = 0; |
| 772 | |
| 773 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 774 | "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", |
| 775 | PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); |
| 776 | |
| 777 | /* first, search this pad */ |
| 778 | |
| 779 | if (padlist) { /* not an undef CV */ |
| 780 | I32 fake_offset = 0; |
| 781 | const AV * const nameav = MUTABLE_AV(AvARRAY(padlist)[0]); |
| 782 | SV * const * const name_svp = AvARRAY(nameav); |
| 783 | |
| 784 | for (offset = AvFILLp(nameav); offset > 0; offset--) { |
| 785 | const SV * const namesv = name_svp[offset]; |
| 786 | if (namesv && namesv != &PL_sv_undef |
| 787 | && strEQ(SvPVX_const(namesv), name)) |
| 788 | { |
| 789 | if (SvFAKE(namesv)) |
| 790 | fake_offset = offset; /* in case we don't find a real one */ |
| 791 | else if ( seq > COP_SEQ_RANGE_LOW(namesv) /* min */ |
| 792 | && seq <= COP_SEQ_RANGE_HIGH(namesv)) /* max */ |
| 793 | break; |
| 794 | } |
| 795 | } |
| 796 | |
| 797 | if (offset > 0 || fake_offset > 0 ) { /* a match! */ |
| 798 | if (offset > 0) { /* not fake */ |
| 799 | fake_offset = 0; |
| 800 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
| 801 | |
| 802 | /* set PAD_FAKELEX_MULTI if this lex can have multiple |
| 803 | * instances. For now, we just test !CvUNIQUE(cv), but |
| 804 | * ideally, we should detect my's declared within loops |
| 805 | * etc - this would allow a wider range of 'not stayed |
| 806 | * shared' warnings. We also treated alreadly-compiled |
| 807 | * lexes as not multi as viewed from evals. */ |
| 808 | |
| 809 | *out_flags = CvANON(cv) ? |
| 810 | PAD_FAKELEX_ANON : |
| 811 | (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) |
| 812 | ? PAD_FAKELEX_MULTI : 0; |
| 813 | |
| 814 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 815 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%lu,%lu)\n", |
| 816 | PTR2UV(cv), (long)offset, |
| 817 | (unsigned long)COP_SEQ_RANGE_LOW(*out_name_sv), |
| 818 | (unsigned long)COP_SEQ_RANGE_HIGH(*out_name_sv))); |
| 819 | } |
| 820 | else { /* fake match */ |
| 821 | offset = fake_offset; |
| 822 | *out_name_sv = name_svp[offset]; /* return the namesv */ |
| 823 | *out_flags = PARENT_FAKELEX_FLAGS(*out_name_sv); |
| 824 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 825 | "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", |
| 826 | PTR2UV(cv), (long)offset, (unsigned long)*out_flags, |
| 827 | (unsigned long) PARENT_PAD_INDEX(*out_name_sv) |
| 828 | )); |
| 829 | } |
| 830 | |
| 831 | /* return the lex? */ |
| 832 | |
| 833 | if (out_capture) { |
| 834 | |
| 835 | /* our ? */ |
| 836 | if (SvPAD_OUR(*out_name_sv)) { |
| 837 | *out_capture = NULL; |
| 838 | return offset; |
| 839 | } |
| 840 | |
| 841 | /* trying to capture from an anon prototype? */ |
| 842 | if (CvCOMPILED(cv) |
| 843 | ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) |
| 844 | : *out_flags & PAD_FAKELEX_ANON) |
| 845 | { |
| 846 | if (warn) |
| 847 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
| 848 | "Variable \"%s\" is not available", name); |
| 849 | *out_capture = NULL; |
| 850 | } |
| 851 | |
| 852 | /* real value */ |
| 853 | else { |
| 854 | int newwarn = warn; |
| 855 | if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) |
| 856 | && !SvPAD_STATE(name_svp[offset]) |
| 857 | && warn && ckWARN(WARN_CLOSURE)) { |
| 858 | newwarn = 0; |
| 859 | Perl_warner(aTHX_ packWARN(WARN_CLOSURE), |
| 860 | "Variable \"%s\" will not stay shared", name); |
| 861 | } |
| 862 | |
| 863 | if (fake_offset && CvANON(cv) |
| 864 | && CvCLONE(cv) &&!CvCLONED(cv)) |
| 865 | { |
| 866 | SV *n; |
| 867 | /* not yet caught - look further up */ |
| 868 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 869 | "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", |
| 870 | PTR2UV(cv))); |
| 871 | n = *out_name_sv; |
| 872 | (void) pad_findlex(name, CvOUTSIDE(cv), |
| 873 | CvOUTSIDE_SEQ(cv), |
| 874 | newwarn, out_capture, out_name_sv, out_flags); |
| 875 | *out_name_sv = n; |
| 876 | return offset; |
| 877 | } |
| 878 | |
| 879 | *out_capture = AvARRAY(MUTABLE_AV(AvARRAY(padlist)[ |
| 880 | CvDEPTH(cv) ? CvDEPTH(cv) : 1]))[offset]; |
| 881 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 882 | "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", |
| 883 | PTR2UV(cv), PTR2UV(*out_capture))); |
| 884 | |
| 885 | if (SvPADSTALE(*out_capture) |
| 886 | && !SvPAD_STATE(name_svp[offset])) |
| 887 | { |
| 888 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
| 889 | "Variable \"%s\" is not available", name); |
| 890 | *out_capture = NULL; |
| 891 | } |
| 892 | } |
| 893 | if (!*out_capture) { |
| 894 | if (*name == '@') |
| 895 | *out_capture = sv_2mortal(MUTABLE_SV(newAV())); |
| 896 | else if (*name == '%') |
| 897 | *out_capture = sv_2mortal(MUTABLE_SV(newHV())); |
| 898 | else |
| 899 | *out_capture = sv_newmortal(); |
| 900 | } |
| 901 | } |
| 902 | |
| 903 | return offset; |
| 904 | } |
| 905 | } |
| 906 | |
| 907 | /* it's not in this pad - try above */ |
| 908 | |
| 909 | if (!CvOUTSIDE(cv)) |
| 910 | return NOT_IN_PAD; |
| 911 | |
| 912 | /* out_capture non-null means caller wants us to capture lex; in |
| 913 | * addition we capture ourselves unless it's an ANON/format */ |
| 914 | new_capturep = out_capture ? out_capture : |
| 915 | CvLATE(cv) ? NULL : &new_capture; |
| 916 | |
| 917 | offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, |
| 918 | new_capturep, out_name_sv, out_flags); |
| 919 | if ((PADOFFSET)offset == NOT_IN_PAD) |
| 920 | return NOT_IN_PAD; |
| 921 | |
| 922 | /* found in an outer CV. Add appropriate fake entry to this pad */ |
| 923 | |
| 924 | /* don't add new fake entries (via eval) to CVs that we have already |
| 925 | * finished compiling, or to undef CVs */ |
| 926 | if (CvCOMPILED(cv) || !padlist) |
| 927 | return 0; /* this dummy (and invalid) value isnt used by the caller */ |
| 928 | |
| 929 | { |
| 930 | /* This relies on sv_setsv_flags() upgrading the destination to the same |
| 931 | type as the source, independant of the flags set, and on it being |
| 932 | "good" and only copying flag bits and pointers that it understands. |
| 933 | */ |
| 934 | SV *new_namesv = newSVsv(*out_name_sv); |
| 935 | AV * const ocomppad_name = PL_comppad_name; |
| 936 | PAD * const ocomppad = PL_comppad; |
| 937 | PL_comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
| 938 | PL_comppad = MUTABLE_AV(AvARRAY(padlist)[1]); |
| 939 | PL_curpad = AvARRAY(PL_comppad); |
| 940 | |
| 941 | new_offset |
| 942 | = pad_add_name_sv(new_namesv, |
| 943 | (SvPAD_STATE(*out_name_sv) ? padadd_STATE : 0), |
| 944 | SvPAD_TYPED(*out_name_sv) |
| 945 | ? SvSTASH(*out_name_sv) : NULL, |
| 946 | SvOURSTASH(*out_name_sv) |
| 947 | ); |
| 948 | |
| 949 | SvFAKE_on(new_namesv); |
| 950 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 951 | "Pad addname: %ld \"%.*s\" FAKE\n", |
| 952 | (long)new_offset, |
| 953 | (int) SvCUR(new_namesv), SvPVX(new_namesv))); |
| 954 | PARENT_FAKELEX_FLAGS_set(new_namesv, *out_flags); |
| 955 | |
| 956 | PARENT_PAD_INDEX_set(new_namesv, 0); |
| 957 | if (SvPAD_OUR(new_namesv)) { |
| 958 | NOOP; /* do nothing */ |
| 959 | } |
| 960 | else if (CvLATE(cv)) { |
| 961 | /* delayed creation - just note the offset within parent pad */ |
| 962 | PARENT_PAD_INDEX_set(new_namesv, offset); |
| 963 | CvCLONE_on(cv); |
| 964 | } |
| 965 | else { |
| 966 | /* immediate creation - capture outer value right now */ |
| 967 | av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); |
| 968 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 969 | "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", |
| 970 | PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); |
| 971 | } |
| 972 | *out_name_sv = new_namesv; |
| 973 | *out_flags = PARENT_FAKELEX_FLAGS(new_namesv); |
| 974 | |
| 975 | PL_comppad_name = ocomppad_name; |
| 976 | PL_comppad = ocomppad; |
| 977 | PL_curpad = ocomppad ? AvARRAY(ocomppad) : NULL; |
| 978 | } |
| 979 | return new_offset; |
| 980 | } |
| 981 | |
| 982 | |
| 983 | #ifdef DEBUGGING |
| 984 | /* |
| 985 | =for apidoc pad_sv |
| 986 | |
| 987 | Get the value at offset po in the current pad. |
| 988 | Use macro PAD_SV instead of calling this function directly. |
| 989 | |
| 990 | =cut |
| 991 | */ |
| 992 | |
| 993 | |
| 994 | SV * |
| 995 | Perl_pad_sv(pTHX_ PADOFFSET po) |
| 996 | { |
| 997 | dVAR; |
| 998 | ASSERT_CURPAD_ACTIVE("pad_sv"); |
| 999 | |
| 1000 | if (!po) |
| 1001 | Perl_croak(aTHX_ "panic: pad_sv po"); |
| 1002 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1003 | "Pad 0x%"UVxf"[0x%"UVxf"] sv: %ld sv=0x%"UVxf"\n", |
| 1004 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(PL_curpad[po])) |
| 1005 | ); |
| 1006 | return PL_curpad[po]; |
| 1007 | } |
| 1008 | |
| 1009 | |
| 1010 | /* |
| 1011 | =for apidoc pad_setsv |
| 1012 | |
| 1013 | Set the entry at offset po in the current pad to sv. |
| 1014 | Use the macro PAD_SETSV() rather than calling this function directly. |
| 1015 | |
| 1016 | =cut |
| 1017 | */ |
| 1018 | |
| 1019 | void |
| 1020 | Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) |
| 1021 | { |
| 1022 | dVAR; |
| 1023 | |
| 1024 | PERL_ARGS_ASSERT_PAD_SETSV; |
| 1025 | |
| 1026 | ASSERT_CURPAD_ACTIVE("pad_setsv"); |
| 1027 | |
| 1028 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1029 | "Pad 0x%"UVxf"[0x%"UVxf"] setsv: %ld sv=0x%"UVxf"\n", |
| 1030 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po, PTR2UV(sv)) |
| 1031 | ); |
| 1032 | PL_curpad[po] = sv; |
| 1033 | } |
| 1034 | #endif |
| 1035 | |
| 1036 | |
| 1037 | |
| 1038 | /* |
| 1039 | =for apidoc pad_block_start |
| 1040 | |
| 1041 | Update the pad compilation state variables on entry to a new block |
| 1042 | |
| 1043 | =cut |
| 1044 | */ |
| 1045 | |
| 1046 | /* XXX DAPM perhaps: |
| 1047 | * - integrate this in general state-saving routine ??? |
| 1048 | * - combine with the state-saving going on in pad_new ??? |
| 1049 | * - introduce a new SAVE type that does all this in one go ? |
| 1050 | */ |
| 1051 | |
| 1052 | void |
| 1053 | Perl_pad_block_start(pTHX_ int full) |
| 1054 | { |
| 1055 | dVAR; |
| 1056 | ASSERT_CURPAD_ACTIVE("pad_block_start"); |
| 1057 | SAVEI32(PL_comppad_name_floor); |
| 1058 | PL_comppad_name_floor = AvFILLp(PL_comppad_name); |
| 1059 | if (full) |
| 1060 | PL_comppad_name_fill = PL_comppad_name_floor; |
| 1061 | if (PL_comppad_name_floor < 0) |
| 1062 | PL_comppad_name_floor = 0; |
| 1063 | SAVEI32(PL_min_intro_pending); |
| 1064 | SAVEI32(PL_max_intro_pending); |
| 1065 | PL_min_intro_pending = 0; |
| 1066 | SAVEI32(PL_comppad_name_fill); |
| 1067 | SAVEI32(PL_padix_floor); |
| 1068 | PL_padix_floor = PL_padix; |
| 1069 | PL_pad_reset_pending = FALSE; |
| 1070 | } |
| 1071 | |
| 1072 | |
| 1073 | /* |
| 1074 | =for apidoc intro_my |
| 1075 | |
| 1076 | "Introduce" my variables to visible status. |
| 1077 | |
| 1078 | =cut |
| 1079 | */ |
| 1080 | |
| 1081 | U32 |
| 1082 | Perl_intro_my(pTHX) |
| 1083 | { |
| 1084 | dVAR; |
| 1085 | SV **svp; |
| 1086 | I32 i; |
| 1087 | |
| 1088 | ASSERT_CURPAD_ACTIVE("intro_my"); |
| 1089 | if (! PL_min_intro_pending) |
| 1090 | return PL_cop_seqmax; |
| 1091 | |
| 1092 | svp = AvARRAY(PL_comppad_name); |
| 1093 | for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { |
| 1094 | SV * const sv = svp[i]; |
| 1095 | |
| 1096 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !COP_SEQ_RANGE_HIGH(sv)) { |
| 1097 | COP_SEQ_RANGE_HIGH_set(sv, PAD_MAX); /* Don't know scope end yet. */ |
| 1098 | COP_SEQ_RANGE_LOW_set(sv, PL_cop_seqmax); |
| 1099 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1100 | "Pad intromy: %ld \"%s\", (%lu,%lu)\n", |
| 1101 | (long)i, SvPVX_const(sv), |
| 1102 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
| 1103 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) |
| 1104 | ); |
| 1105 | } |
| 1106 | } |
| 1107 | PL_min_intro_pending = 0; |
| 1108 | PL_comppad_name_fill = PL_max_intro_pending; /* Needn't search higher */ |
| 1109 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1110 | "Pad intromy: seq -> %ld\n", (long)(PL_cop_seqmax+1))); |
| 1111 | |
| 1112 | return PL_cop_seqmax++; |
| 1113 | } |
| 1114 | |
| 1115 | /* |
| 1116 | =for apidoc pad_leavemy |
| 1117 | |
| 1118 | Cleanup at end of scope during compilation: set the max seq number for |
| 1119 | lexicals in this scope and warn of any lexicals that never got introduced. |
| 1120 | |
| 1121 | =cut |
| 1122 | */ |
| 1123 | |
| 1124 | void |
| 1125 | Perl_pad_leavemy(pTHX) |
| 1126 | { |
| 1127 | dVAR; |
| 1128 | I32 off; |
| 1129 | SV * const * const svp = AvARRAY(PL_comppad_name); |
| 1130 | |
| 1131 | PL_pad_reset_pending = FALSE; |
| 1132 | |
| 1133 | ASSERT_CURPAD_ACTIVE("pad_leavemy"); |
| 1134 | if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { |
| 1135 | for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { |
| 1136 | const SV * const sv = svp[off]; |
| 1137 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv)) |
| 1138 | Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), |
| 1139 | "%"SVf" never introduced", |
| 1140 | SVfARG(sv)); |
| 1141 | } |
| 1142 | } |
| 1143 | /* "Deintroduce" my variables that are leaving with this scope. */ |
| 1144 | for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { |
| 1145 | const SV * const sv = svp[off]; |
| 1146 | if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && COP_SEQ_RANGE_HIGH(sv) == PAD_MAX) { |
| 1147 | COP_SEQ_RANGE_HIGH_set(sv, PL_cop_seqmax); |
| 1148 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1149 | "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", |
| 1150 | (long)off, SvPVX_const(sv), |
| 1151 | (unsigned long)COP_SEQ_RANGE_LOW(sv), |
| 1152 | (unsigned long)COP_SEQ_RANGE_HIGH(sv)) |
| 1153 | ); |
| 1154 | } |
| 1155 | } |
| 1156 | PL_cop_seqmax++; |
| 1157 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1158 | "Pad leavemy: seq = %ld\n", (long)PL_cop_seqmax)); |
| 1159 | } |
| 1160 | |
| 1161 | |
| 1162 | /* |
| 1163 | =for apidoc pad_swipe |
| 1164 | |
| 1165 | Abandon the tmp in the current pad at offset po and replace with a |
| 1166 | new one. |
| 1167 | |
| 1168 | =cut |
| 1169 | */ |
| 1170 | |
| 1171 | void |
| 1172 | Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) |
| 1173 | { |
| 1174 | dVAR; |
| 1175 | ASSERT_CURPAD_LEGAL("pad_swipe"); |
| 1176 | if (!PL_curpad) |
| 1177 | return; |
| 1178 | if (AvARRAY(PL_comppad) != PL_curpad) |
| 1179 | Perl_croak(aTHX_ "panic: pad_swipe curpad"); |
| 1180 | if (!po) |
| 1181 | Perl_croak(aTHX_ "panic: pad_swipe po"); |
| 1182 | |
| 1183 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1184 | "Pad 0x%"UVxf"[0x%"UVxf"] swipe: %ld\n", |
| 1185 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po)); |
| 1186 | |
| 1187 | if (PL_curpad[po]) |
| 1188 | SvPADTMP_off(PL_curpad[po]); |
| 1189 | if (refadjust) |
| 1190 | SvREFCNT_dec(PL_curpad[po]); |
| 1191 | |
| 1192 | |
| 1193 | /* if pad tmps aren't shared between ops, then there's no need to |
| 1194 | * create a new tmp when an existing op is freed */ |
| 1195 | #ifdef USE_BROKEN_PAD_RESET |
| 1196 | PL_curpad[po] = newSV(0); |
| 1197 | SvPADTMP_on(PL_curpad[po]); |
| 1198 | #else |
| 1199 | PL_curpad[po] = &PL_sv_undef; |
| 1200 | #endif |
| 1201 | if ((I32)po < PL_padix) |
| 1202 | PL_padix = po - 1; |
| 1203 | } |
| 1204 | |
| 1205 | |
| 1206 | /* |
| 1207 | =for apidoc pad_reset |
| 1208 | |
| 1209 | Mark all the current temporaries for reuse |
| 1210 | |
| 1211 | =cut |
| 1212 | */ |
| 1213 | |
| 1214 | /* XXX pad_reset() is currently disabled because it results in serious bugs. |
| 1215 | * It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed |
| 1216 | * on the stack by OPs that use them, there are several ways to get an alias |
| 1217 | * to a shared TARG. Such an alias will change randomly and unpredictably. |
| 1218 | * We avoid doing this until we can think of a Better Way. |
| 1219 | * GSAR 97-10-29 */ |
| 1220 | static void |
| 1221 | S_pad_reset(pTHX) |
| 1222 | { |
| 1223 | dVAR; |
| 1224 | #ifdef USE_BROKEN_PAD_RESET |
| 1225 | if (AvARRAY(PL_comppad) != PL_curpad) |
| 1226 | Perl_croak(aTHX_ "panic: pad_reset curpad"); |
| 1227 | |
| 1228 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1229 | "Pad 0x%"UVxf"[0x%"UVxf"] reset: padix %ld -> %ld", |
| 1230 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), |
| 1231 | (long)PL_padix, (long)PL_padix_floor |
| 1232 | ) |
| 1233 | ); |
| 1234 | |
| 1235 | if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ |
| 1236 | register I32 po; |
| 1237 | for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { |
| 1238 | if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) |
| 1239 | SvPADTMP_off(PL_curpad[po]); |
| 1240 | } |
| 1241 | PL_padix = PL_padix_floor; |
| 1242 | } |
| 1243 | #endif |
| 1244 | PL_pad_reset_pending = FALSE; |
| 1245 | } |
| 1246 | |
| 1247 | |
| 1248 | /* |
| 1249 | =for apidoc pad_tidy |
| 1250 | |
| 1251 | Tidy up a pad after we've finished compiling it: |
| 1252 | * remove most stuff from the pads of anonsub prototypes; |
| 1253 | * give it a @_; |
| 1254 | * mark tmps as such. |
| 1255 | |
| 1256 | =cut |
| 1257 | */ |
| 1258 | |
| 1259 | /* XXX DAPM surely most of this stuff should be done properly |
| 1260 | * at the right time beforehand, rather than going around afterwards |
| 1261 | * cleaning up our mistakes ??? |
| 1262 | */ |
| 1263 | |
| 1264 | void |
| 1265 | Perl_pad_tidy(pTHX_ padtidy_type type) |
| 1266 | { |
| 1267 | dVAR; |
| 1268 | |
| 1269 | ASSERT_CURPAD_ACTIVE("pad_tidy"); |
| 1270 | |
| 1271 | /* If this CV has had any 'eval-capable' ops planted in it |
| 1272 | * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any |
| 1273 | * anon prototypes in the chain of CVs should be marked as cloneable, |
| 1274 | * so that for example the eval's CV in C<< sub { eval '$x' } >> gets |
| 1275 | * the right CvOUTSIDE. |
| 1276 | * If running with -d, *any* sub may potentially have an eval |
| 1277 | * excuted within it. |
| 1278 | */ |
| 1279 | |
| 1280 | if (PL_cv_has_eval || PL_perldb) { |
| 1281 | const CV *cv; |
| 1282 | for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { |
| 1283 | if (cv != PL_compcv && CvCOMPILED(cv)) |
| 1284 | break; /* no need to mark already-compiled code */ |
| 1285 | if (CvANON(cv)) { |
| 1286 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, |
| 1287 | "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); |
| 1288 | CvCLONE_on(cv); |
| 1289 | } |
| 1290 | } |
| 1291 | } |
| 1292 | |
| 1293 | /* extend curpad to match namepad */ |
| 1294 | if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) |
| 1295 | av_store(PL_comppad_name, AvFILLp(PL_comppad), NULL); |
| 1296 | |
| 1297 | if (type == padtidy_SUBCLONE) { |
| 1298 | SV * const * const namep = AvARRAY(PL_comppad_name); |
| 1299 | PADOFFSET ix; |
| 1300 | |
| 1301 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
| 1302 | SV *namesv; |
| 1303 | |
| 1304 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
| 1305 | continue; |
| 1306 | /* |
| 1307 | * The only things that a clonable function needs in its |
| 1308 | * pad are anonymous subs. |
| 1309 | * The rest are created anew during cloning. |
| 1310 | */ |
| 1311 | if (!((namesv = namep[ix]) != NULL && |
| 1312 | namesv != &PL_sv_undef && |
| 1313 | *SvPVX_const(namesv) == '&')) |
| 1314 | { |
| 1315 | SvREFCNT_dec(PL_curpad[ix]); |
| 1316 | PL_curpad[ix] = NULL; |
| 1317 | } |
| 1318 | } |
| 1319 | } |
| 1320 | else if (type == padtidy_SUB) { |
| 1321 | /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ |
| 1322 | AV * const av = newAV(); /* Will be @_ */ |
| 1323 | av_store(PL_comppad, 0, MUTABLE_SV(av)); |
| 1324 | AvREIFY_only(av); |
| 1325 | } |
| 1326 | |
| 1327 | if (type == padtidy_SUB || type == padtidy_FORMAT) { |
| 1328 | SV * const * const namep = AvARRAY(PL_comppad_name); |
| 1329 | PADOFFSET ix; |
| 1330 | for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { |
| 1331 | if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) |
| 1332 | continue; |
| 1333 | if (!SvPADMY(PL_curpad[ix])) { |
| 1334 | SvPADTMP_on(PL_curpad[ix]); |
| 1335 | } else if (!SvFAKE(namep[ix])) { |
| 1336 | /* This is a work around for how the current implementation of |
| 1337 | ?{ } blocks in regexps interacts with lexicals. |
| 1338 | |
| 1339 | One of our lexicals. |
| 1340 | Can't do this on all lexicals, otherwise sub baz() won't |
| 1341 | compile in |
| 1342 | |
| 1343 | my $foo; |
| 1344 | |
| 1345 | sub bar { ++$foo; } |
| 1346 | |
| 1347 | sub baz { ++$foo; } |
| 1348 | |
| 1349 | because completion of compiling &bar calling pad_tidy() |
| 1350 | would cause (top level) $foo to be marked as stale, and |
| 1351 | "no longer available". */ |
| 1352 | SvPADSTALE_on(PL_curpad[ix]); |
| 1353 | } |
| 1354 | } |
| 1355 | } |
| 1356 | PL_curpad = AvARRAY(PL_comppad); |
| 1357 | } |
| 1358 | |
| 1359 | |
| 1360 | /* |
| 1361 | =for apidoc pad_free |
| 1362 | |
| 1363 | Free the SV at offset po in the current pad. |
| 1364 | |
| 1365 | =cut |
| 1366 | */ |
| 1367 | |
| 1368 | /* XXX DAPM integrate with pad_swipe ???? */ |
| 1369 | void |
| 1370 | Perl_pad_free(pTHX_ PADOFFSET po) |
| 1371 | { |
| 1372 | dVAR; |
| 1373 | ASSERT_CURPAD_LEGAL("pad_free"); |
| 1374 | if (!PL_curpad) |
| 1375 | return; |
| 1376 | if (AvARRAY(PL_comppad) != PL_curpad) |
| 1377 | Perl_croak(aTHX_ "panic: pad_free curpad"); |
| 1378 | if (!po) |
| 1379 | Perl_croak(aTHX_ "panic: pad_free po"); |
| 1380 | |
| 1381 | DEBUG_X(PerlIO_printf(Perl_debug_log, |
| 1382 | "Pad 0x%"UVxf"[0x%"UVxf"] free: %ld\n", |
| 1383 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long)po) |
| 1384 | ); |
| 1385 | |
| 1386 | if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { |
| 1387 | SvPADTMP_off(PL_curpad[po]); |
| 1388 | #ifdef USE_ITHREADS |
| 1389 | /* SV could be a shared hash key (eg bugid #19022) */ |
| 1390 | if (!SvIsCOW(PL_curpad[po])) |
| 1391 | SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ |
| 1392 | #endif |
| 1393 | } |
| 1394 | if ((I32)po < PL_padix) |
| 1395 | PL_padix = po - 1; |
| 1396 | } |
| 1397 | |
| 1398 | |
| 1399 | |
| 1400 | /* |
| 1401 | =for apidoc do_dump_pad |
| 1402 | |
| 1403 | Dump the contents of a padlist |
| 1404 | |
| 1405 | =cut |
| 1406 | */ |
| 1407 | |
| 1408 | void |
| 1409 | Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) |
| 1410 | { |
| 1411 | dVAR; |
| 1412 | const AV *pad_name; |
| 1413 | const AV *pad; |
| 1414 | SV **pname; |
| 1415 | SV **ppad; |
| 1416 | I32 ix; |
| 1417 | |
| 1418 | PERL_ARGS_ASSERT_DO_DUMP_PAD; |
| 1419 | |
| 1420 | if (!padlist) { |
| 1421 | return; |
| 1422 | } |
| 1423 | pad_name = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 0, FALSE)); |
| 1424 | pad = MUTABLE_AV(*av_fetch(MUTABLE_AV(padlist), 1, FALSE)); |
| 1425 | pname = AvARRAY(pad_name); |
| 1426 | ppad = AvARRAY(pad); |
| 1427 | Perl_dump_indent(aTHX_ level, file, |
| 1428 | "PADNAME = 0x%"UVxf"(0x%"UVxf") PAD = 0x%"UVxf"(0x%"UVxf")\n", |
| 1429 | PTR2UV(pad_name), PTR2UV(pname), PTR2UV(pad), PTR2UV(ppad) |
| 1430 | ); |
| 1431 | |
| 1432 | for (ix = 1; ix <= AvFILLp(pad_name); ix++) { |
| 1433 | const SV *namesv = pname[ix]; |
| 1434 | if (namesv && namesv == &PL_sv_undef) { |
| 1435 | namesv = NULL; |
| 1436 | } |
| 1437 | if (namesv) { |
| 1438 | if (SvFAKE(namesv)) |
| 1439 | Perl_dump_indent(aTHX_ level+1, file, |
| 1440 | "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", |
| 1441 | (int) ix, |
| 1442 | PTR2UV(ppad[ix]), |
| 1443 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
| 1444 | SvPVX_const(namesv), |
| 1445 | (unsigned long)PARENT_FAKELEX_FLAGS(namesv), |
| 1446 | (unsigned long)PARENT_PAD_INDEX(namesv) |
| 1447 | |
| 1448 | ); |
| 1449 | else |
| 1450 | Perl_dump_indent(aTHX_ level+1, file, |
| 1451 | "%2d. 0x%"UVxf"<%lu> (%lu,%lu) \"%s\"\n", |
| 1452 | (int) ix, |
| 1453 | PTR2UV(ppad[ix]), |
| 1454 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), |
| 1455 | (unsigned long)COP_SEQ_RANGE_LOW(namesv), |
| 1456 | (unsigned long)COP_SEQ_RANGE_HIGH(namesv), |
| 1457 | SvPVX_const(namesv) |
| 1458 | ); |
| 1459 | } |
| 1460 | else if (full) { |
| 1461 | Perl_dump_indent(aTHX_ level+1, file, |
| 1462 | "%2d. 0x%"UVxf"<%lu>\n", |
| 1463 | (int) ix, |
| 1464 | PTR2UV(ppad[ix]), |
| 1465 | (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0) |
| 1466 | ); |
| 1467 | } |
| 1468 | } |
| 1469 | } |
| 1470 | |
| 1471 | |
| 1472 | |
| 1473 | /* |
| 1474 | =for apidoc cv_dump |
| 1475 | |
| 1476 | dump the contents of a CV |
| 1477 | |
| 1478 | =cut |
| 1479 | */ |
| 1480 | |
| 1481 | #ifdef DEBUGGING |
| 1482 | STATIC void |
| 1483 | S_cv_dump(pTHX_ const CV *cv, const char *title) |
| 1484 | { |
| 1485 | dVAR; |
| 1486 | const CV * const outside = CvOUTSIDE(cv); |
| 1487 | AV* const padlist = CvPADLIST(cv); |
| 1488 | |
| 1489 | PERL_ARGS_ASSERT_CV_DUMP; |
| 1490 | |
| 1491 | PerlIO_printf(Perl_debug_log, |
| 1492 | " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", |
| 1493 | title, |
| 1494 | PTR2UV(cv), |
| 1495 | (CvANON(cv) ? "ANON" |
| 1496 | : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" |
| 1497 | : (cv == PL_main_cv) ? "MAIN" |
| 1498 | : CvUNIQUE(cv) ? "UNIQUE" |
| 1499 | : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), |
| 1500 | PTR2UV(outside), |
| 1501 | (!outside ? "null" |
| 1502 | : CvANON(outside) ? "ANON" |
| 1503 | : (outside == PL_main_cv) ? "MAIN" |
| 1504 | : CvUNIQUE(outside) ? "UNIQUE" |
| 1505 | : CvGV(outside) ? GvNAME(CvGV(outside)) : "UNDEFINED")); |
| 1506 | |
| 1507 | PerlIO_printf(Perl_debug_log, |
| 1508 | " PADLIST = 0x%"UVxf"\n", PTR2UV(padlist)); |
| 1509 | do_dump_pad(1, Perl_debug_log, padlist, 1); |
| 1510 | } |
| 1511 | #endif /* DEBUGGING */ |
| 1512 | |
| 1513 | |
| 1514 | |
| 1515 | |
| 1516 | |
| 1517 | /* |
| 1518 | =for apidoc cv_clone |
| 1519 | |
| 1520 | Clone a CV: make a new CV which points to the same code etc, but which |
| 1521 | has a newly-created pad built by copying the prototype pad and capturing |
| 1522 | any outer lexicals. |
| 1523 | |
| 1524 | =cut |
| 1525 | */ |
| 1526 | |
| 1527 | CV * |
| 1528 | Perl_cv_clone(pTHX_ CV *proto) |
| 1529 | { |
| 1530 | dVAR; |
| 1531 | I32 ix; |
| 1532 | AV* const protopadlist = CvPADLIST(proto); |
| 1533 | const AV *const protopad_name = (const AV *)*av_fetch(protopadlist, 0, FALSE); |
| 1534 | const AV *const protopad = (const AV *)*av_fetch(protopadlist, 1, FALSE); |
| 1535 | SV** const pname = AvARRAY(protopad_name); |
| 1536 | SV** const ppad = AvARRAY(protopad); |
| 1537 | const I32 fname = AvFILLp(protopad_name); |
| 1538 | const I32 fpad = AvFILLp(protopad); |
| 1539 | CV* cv; |
| 1540 | SV** outpad; |
| 1541 | CV* outside; |
| 1542 | long depth; |
| 1543 | |
| 1544 | PERL_ARGS_ASSERT_CV_CLONE; |
| 1545 | |
| 1546 | assert(!CvUNIQUE(proto)); |
| 1547 | |
| 1548 | /* Since cloneable anon subs can be nested, CvOUTSIDE may point |
| 1549 | * to a prototype; we instead want the cloned parent who called us. |
| 1550 | * Note that in general for formats, CvOUTSIDE != find_runcv */ |
| 1551 | |
| 1552 | outside = CvOUTSIDE(proto); |
| 1553 | if (outside && CvCLONE(outside) && ! CvCLONED(outside)) |
| 1554 | outside = find_runcv(NULL); |
| 1555 | depth = CvDEPTH(outside); |
| 1556 | assert(depth || SvTYPE(proto) == SVt_PVFM); |
| 1557 | if (!depth) |
| 1558 | depth = 1; |
| 1559 | assert(CvPADLIST(outside)); |
| 1560 | |
| 1561 | ENTER; |
| 1562 | SAVESPTR(PL_compcv); |
| 1563 | |
| 1564 | cv = PL_compcv = MUTABLE_CV(newSV_type(SvTYPE(proto))); |
| 1565 | CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); |
| 1566 | CvCLONED_on(cv); |
| 1567 | |
| 1568 | #ifdef USE_ITHREADS |
| 1569 | CvFILE(cv) = CvISXSUB(proto) ? CvFILE(proto) |
| 1570 | : savepv(CvFILE(proto)); |
| 1571 | #else |
| 1572 | CvFILE(cv) = CvFILE(proto); |
| 1573 | #endif |
| 1574 | cvgv_set(cv,CvGV(proto)); |
| 1575 | CvSTASH(cv) = CvSTASH(proto); |
| 1576 | if (CvSTASH(cv)) |
| 1577 | Perl_sv_add_backref(aTHX_ MUTABLE_SV(CvSTASH(cv)), MUTABLE_SV(cv)); |
| 1578 | OP_REFCNT_LOCK; |
| 1579 | CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); |
| 1580 | OP_REFCNT_UNLOCK; |
| 1581 | CvSTART(cv) = CvSTART(proto); |
| 1582 | CvOUTSIDE(cv) = MUTABLE_CV(SvREFCNT_inc_simple(outside)); |
| 1583 | CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); |
| 1584 | |
| 1585 | if (SvPOK(proto)) |
| 1586 | sv_setpvn(MUTABLE_SV(cv), SvPVX_const(proto), SvCUR(proto)); |
| 1587 | |
| 1588 | CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); |
| 1589 | |
| 1590 | av_fill(PL_comppad, fpad); |
| 1591 | for (ix = fname; ix >= 0; ix--) |
| 1592 | av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); |
| 1593 | |
| 1594 | PL_curpad = AvARRAY(PL_comppad); |
| 1595 | |
| 1596 | outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); |
| 1597 | |
| 1598 | for (ix = fpad; ix > 0; ix--) { |
| 1599 | SV* const namesv = (ix <= fname) ? pname[ix] : NULL; |
| 1600 | SV *sv = NULL; |
| 1601 | if (namesv && namesv != &PL_sv_undef) { /* lexical */ |
| 1602 | if (SvFAKE(namesv)) { /* lexical from outside? */ |
| 1603 | sv = outpad[PARENT_PAD_INDEX(namesv)]; |
| 1604 | assert(sv); |
| 1605 | /* formats may have an inactive parent, |
| 1606 | while my $x if $false can leave an active var marked as |
| 1607 | stale. And state vars are always available */ |
| 1608 | if (SvPADSTALE(sv) && !SvPAD_STATE(namesv)) { |
| 1609 | Perl_ck_warner(aTHX_ packWARN(WARN_CLOSURE), |
| 1610 | "Variable \"%s\" is not available", SvPVX_const(namesv)); |
| 1611 | sv = NULL; |
| 1612 | } |
| 1613 | else |
| 1614 | SvREFCNT_inc_simple_void_NN(sv); |
| 1615 | } |
| 1616 | if (!sv) { |
| 1617 | const char sigil = SvPVX_const(namesv)[0]; |
| 1618 | if (sigil == '&') |
| 1619 | sv = SvREFCNT_inc(ppad[ix]); |
| 1620 | else if (sigil == '@') |
| 1621 | sv = MUTABLE_SV(newAV()); |
| 1622 | else if (sigil == '%') |
| 1623 | sv = MUTABLE_SV(newHV()); |
| 1624 | else |
| 1625 | sv = newSV(0); |
| 1626 | SvPADMY_on(sv); |
| 1627 | /* reset the 'assign only once' flag on each state var */ |
| 1628 | if (SvPAD_STATE(namesv)) |
| 1629 | SvPADSTALE_on(sv); |
| 1630 | } |
| 1631 | } |
| 1632 | else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { |
| 1633 | sv = SvREFCNT_inc_NN(ppad[ix]); |
| 1634 | } |
| 1635 | else { |
| 1636 | sv = newSV(0); |
| 1637 | SvPADTMP_on(sv); |
| 1638 | } |
| 1639 | PL_curpad[ix] = sv; |
| 1640 | } |
| 1641 | |
| 1642 | DEBUG_Xv( |
| 1643 | PerlIO_printf(Perl_debug_log, "\nPad CV clone\n"); |
| 1644 | cv_dump(outside, "Outside"); |
| 1645 | cv_dump(proto, "Proto"); |
| 1646 | cv_dump(cv, "To"); |
| 1647 | ); |
| 1648 | |
| 1649 | LEAVE; |
| 1650 | |
| 1651 | if (CvCONST(cv)) { |
| 1652 | /* Constant sub () { $x } closing over $x - see lib/constant.pm: |
| 1653 | * The prototype was marked as a candiate for const-ization, |
| 1654 | * so try to grab the current const value, and if successful, |
| 1655 | * turn into a const sub: |
| 1656 | */ |
| 1657 | SV* const const_sv = op_const_sv(CvSTART(cv), cv); |
| 1658 | if (const_sv) { |
| 1659 | SvREFCNT_dec(cv); |
| 1660 | cv = newCONSTSUB(CvSTASH(proto), NULL, const_sv); |
| 1661 | } |
| 1662 | else { |
| 1663 | CvCONST_off(cv); |
| 1664 | } |
| 1665 | } |
| 1666 | |
| 1667 | return cv; |
| 1668 | } |
| 1669 | |
| 1670 | |
| 1671 | /* |
| 1672 | =for apidoc pad_fixup_inner_anons |
| 1673 | |
| 1674 | For any anon CVs in the pad, change CvOUTSIDE of that CV from |
| 1675 | old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be |
| 1676 | moved to a pre-existing CV struct. |
| 1677 | |
| 1678 | =cut |
| 1679 | */ |
| 1680 | |
| 1681 | void |
| 1682 | Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) |
| 1683 | { |
| 1684 | dVAR; |
| 1685 | I32 ix; |
| 1686 | AV * const comppad_name = MUTABLE_AV(AvARRAY(padlist)[0]); |
| 1687 | AV * const comppad = MUTABLE_AV(AvARRAY(padlist)[1]); |
| 1688 | SV ** const namepad = AvARRAY(comppad_name); |
| 1689 | SV ** const curpad = AvARRAY(comppad); |
| 1690 | |
| 1691 | PERL_ARGS_ASSERT_PAD_FIXUP_INNER_ANONS; |
| 1692 | PERL_UNUSED_ARG(old_cv); |
| 1693 | |
| 1694 | for (ix = AvFILLp(comppad_name); ix > 0; ix--) { |
| 1695 | const SV * const namesv = namepad[ix]; |
| 1696 | if (namesv && namesv != &PL_sv_undef |
| 1697 | && *SvPVX_const(namesv) == '&') |
| 1698 | { |
| 1699 | CV * const innercv = MUTABLE_CV(curpad[ix]); |
| 1700 | assert(CvWEAKOUTSIDE(innercv)); |
| 1701 | assert(CvOUTSIDE(innercv) == old_cv); |
| 1702 | CvOUTSIDE(innercv) = new_cv; |
| 1703 | } |
| 1704 | } |
| 1705 | } |
| 1706 | |
| 1707 | |
| 1708 | /* |
| 1709 | =for apidoc pad_push |
| 1710 | |
| 1711 | Push a new pad frame onto the padlist, unless there's already a pad at |
| 1712 | this depth, in which case don't bother creating a new one. Then give |
| 1713 | the new pad an @_ in slot zero. |
| 1714 | |
| 1715 | =cut |
| 1716 | */ |
| 1717 | |
| 1718 | void |
| 1719 | Perl_pad_push(pTHX_ PADLIST *padlist, int depth) |
| 1720 | { |
| 1721 | dVAR; |
| 1722 | |
| 1723 | PERL_ARGS_ASSERT_PAD_PUSH; |
| 1724 | |
| 1725 | if (depth > AvFILLp(padlist)) { |
| 1726 | SV** const svp = AvARRAY(padlist); |
| 1727 | AV* const newpad = newAV(); |
| 1728 | SV** const oldpad = AvARRAY(svp[depth-1]); |
| 1729 | I32 ix = AvFILLp((const AV *)svp[1]); |
| 1730 | const I32 names_fill = AvFILLp((const AV *)svp[0]); |
| 1731 | SV** const names = AvARRAY(svp[0]); |
| 1732 | AV *av; |
| 1733 | |
| 1734 | for ( ;ix > 0; ix--) { |
| 1735 | if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
| 1736 | const char sigil = SvPVX_const(names[ix])[0]; |
| 1737 | if ((SvFLAGS(names[ix]) & SVf_FAKE) |
| 1738 | || (SvFLAGS(names[ix]) & SVpad_STATE) |
| 1739 | || sigil == '&') |
| 1740 | { |
| 1741 | /* outer lexical or anon code */ |
| 1742 | av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); |
| 1743 | } |
| 1744 | else { /* our own lexical */ |
| 1745 | SV *sv; |
| 1746 | if (sigil == '@') |
| 1747 | sv = MUTABLE_SV(newAV()); |
| 1748 | else if (sigil == '%') |
| 1749 | sv = MUTABLE_SV(newHV()); |
| 1750 | else |
| 1751 | sv = newSV(0); |
| 1752 | av_store(newpad, ix, sv); |
| 1753 | SvPADMY_on(sv); |
| 1754 | } |
| 1755 | } |
| 1756 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
| 1757 | av_store(newpad, ix, SvREFCNT_inc_NN(oldpad[ix])); |
| 1758 | } |
| 1759 | else { |
| 1760 | /* save temporaries on recursion? */ |
| 1761 | SV * const sv = newSV(0); |
| 1762 | av_store(newpad, ix, sv); |
| 1763 | SvPADTMP_on(sv); |
| 1764 | } |
| 1765 | } |
| 1766 | av = newAV(); |
| 1767 | av_store(newpad, 0, MUTABLE_SV(av)); |
| 1768 | AvREIFY_only(av); |
| 1769 | |
| 1770 | av_store(padlist, depth, MUTABLE_SV(newpad)); |
| 1771 | AvFILLp(padlist) = depth; |
| 1772 | } |
| 1773 | } |
| 1774 | |
| 1775 | |
| 1776 | HV * |
| 1777 | Perl_pad_compname_type(pTHX_ const PADOFFSET po) |
| 1778 | { |
| 1779 | dVAR; |
| 1780 | SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); |
| 1781 | if ( SvPAD_TYPED(*av) ) { |
| 1782 | return SvSTASH(*av); |
| 1783 | } |
| 1784 | return NULL; |
| 1785 | } |
| 1786 | |
| 1787 | #if defined(USE_ITHREADS) |
| 1788 | |
| 1789 | # define av_dup_inc(s,t) MUTABLE_AV(sv_dup_inc((const SV *)s,t)) |
| 1790 | |
| 1791 | AV * |
| 1792 | Perl_padlist_dup(pTHX_ AV *const srcpad, CLONE_PARAMS *const param) |
| 1793 | { |
| 1794 | AV *dstpad; |
| 1795 | PERL_ARGS_ASSERT_PADLIST_DUP; |
| 1796 | |
| 1797 | if (!srcpad) |
| 1798 | return NULL; |
| 1799 | |
| 1800 | assert(!AvREAL(srcpad)); |
| 1801 | |
| 1802 | if (param->flags & CLONEf_COPY_STACKS |
| 1803 | || SvREFCNT(AvARRAY(srcpad)[1]) > 1) { |
| 1804 | /* XXX padlists are real, but pretend to be not */ |
| 1805 | AvREAL_on(srcpad); |
| 1806 | dstpad = av_dup_inc(srcpad, param); |
| 1807 | AvREAL_off(srcpad); |
| 1808 | AvREAL_off(dstpad); |
| 1809 | assert (SvREFCNT(AvARRAY(srcpad)[1]) == 1); |
| 1810 | } else { |
| 1811 | /* CvDEPTH() on our subroutine will be set to 0, so there's no need |
| 1812 | to build anything other than the first level of pads. */ |
| 1813 | |
| 1814 | I32 ix = AvFILLp((const AV *)AvARRAY(srcpad)[1]); |
| 1815 | AV *pad1; |
| 1816 | const I32 names_fill = AvFILLp((const AV *)(AvARRAY(srcpad)[0])); |
| 1817 | const AV *const srcpad1 = (const AV *) AvARRAY(srcpad)[1]; |
| 1818 | SV **oldpad = AvARRAY(srcpad1); |
| 1819 | SV **names; |
| 1820 | SV **pad1a; |
| 1821 | AV *args; |
| 1822 | /* look for it in the table first. |
| 1823 | I *think* that it shouldn't be possible to find it there. |
| 1824 | Well, except for how Perl_sv_compile_2op() "works" :-( */ |
| 1825 | dstpad = (AV*)ptr_table_fetch(PL_ptr_table, srcpad); |
| 1826 | |
| 1827 | if (dstpad) |
| 1828 | return dstpad; |
| 1829 | |
| 1830 | dstpad = newAV(); |
| 1831 | ptr_table_store(PL_ptr_table, srcpad, dstpad); |
| 1832 | AvREAL_off(dstpad); |
| 1833 | av_extend(dstpad, 1); |
| 1834 | AvARRAY(dstpad)[0] = MUTABLE_SV(av_dup_inc(AvARRAY(srcpad)[0], param)); |
| 1835 | names = AvARRAY(AvARRAY(dstpad)[0]); |
| 1836 | |
| 1837 | pad1 = newAV(); |
| 1838 | |
| 1839 | av_extend(pad1, ix); |
| 1840 | AvARRAY(dstpad)[1] = MUTABLE_SV(pad1); |
| 1841 | pad1a = AvARRAY(pad1); |
| 1842 | AvFILLp(dstpad) = 1; |
| 1843 | |
| 1844 | if (ix > -1) { |
| 1845 | AvFILLp(pad1) = ix; |
| 1846 | |
| 1847 | for ( ;ix > 0; ix--) { |
| 1848 | if (!oldpad[ix]) { |
| 1849 | pad1a[ix] = NULL; |
| 1850 | } else if (names_fill >= ix && names[ix] != &PL_sv_undef) { |
| 1851 | const char sigil = SvPVX_const(names[ix])[0]; |
| 1852 | if ((SvFLAGS(names[ix]) & SVf_FAKE) |
| 1853 | || (SvFLAGS(names[ix]) & SVpad_STATE) |
| 1854 | || sigil == '&') |
| 1855 | { |
| 1856 | /* outer lexical or anon code */ |
| 1857 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); |
| 1858 | } |
| 1859 | else { /* our own lexical */ |
| 1860 | if(SvPADSTALE(oldpad[ix]) && SvREFCNT(oldpad[ix]) > 1) { |
| 1861 | /* This is a work around for how the current |
| 1862 | implementation of ?{ } blocks in regexps |
| 1863 | interacts with lexicals. */ |
| 1864 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); |
| 1865 | } else { |
| 1866 | SV *sv; |
| 1867 | |
| 1868 | if (sigil == '@') |
| 1869 | sv = MUTABLE_SV(newAV()); |
| 1870 | else if (sigil == '%') |
| 1871 | sv = MUTABLE_SV(newHV()); |
| 1872 | else |
| 1873 | sv = newSV(0); |
| 1874 | pad1a[ix] = sv; |
| 1875 | SvPADMY_on(sv); |
| 1876 | } |
| 1877 | } |
| 1878 | } |
| 1879 | else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { |
| 1880 | pad1a[ix] = sv_dup_inc(oldpad[ix], param); |
| 1881 | } |
| 1882 | else { |
| 1883 | /* save temporaries on recursion? */ |
| 1884 | SV * const sv = newSV(0); |
| 1885 | pad1a[ix] = sv; |
| 1886 | |
| 1887 | /* SvREFCNT(oldpad[ix]) != 1 for some code in threads.xs |
| 1888 | FIXTHAT before merging this branch. |
| 1889 | (And I know how to) */ |
| 1890 | if (SvPADMY(oldpad[ix])) |
| 1891 | SvPADMY_on(sv); |
| 1892 | else |
| 1893 | SvPADTMP_on(sv); |
| 1894 | } |
| 1895 | } |
| 1896 | |
| 1897 | if (oldpad[0]) { |
| 1898 | args = newAV(); /* Will be @_ */ |
| 1899 | AvREIFY_only(args); |
| 1900 | pad1a[0] = (SV *)args; |
| 1901 | } |
| 1902 | } |
| 1903 | } |
| 1904 | |
| 1905 | return dstpad; |
| 1906 | } |
| 1907 | |
| 1908 | #endif |
| 1909 | |
| 1910 | /* |
| 1911 | * Local variables: |
| 1912 | * c-indentation-style: bsd |
| 1913 | * c-basic-offset: 4 |
| 1914 | * indent-tabs-mode: t |
| 1915 | * End: |
| 1916 | * |
| 1917 | * ex: set ts=8 sts=4 sw=4 noet: |
| 1918 | */ |