| 1 | /* gv.c |
| 2 | * |
| 3 | * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 4 | * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 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 | /* |
| 12 | * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure |
| 13 | * of your inquisitiveness, I shall spend all the rest of my days answering |
| 14 | * you. What more do you want to know?' |
| 15 | * 'The names of all the stars, and of all living things, and the whole |
| 16 | * history of Middle-earth and Over-heaven and of the Sundering Seas,' |
| 17 | * laughed Pippin. |
| 18 | */ |
| 19 | |
| 20 | /* |
| 21 | =head1 GV Functions |
| 22 | |
| 23 | A GV is a structure which corresponds to to a Perl typeglob, ie *foo. |
| 24 | It is a structure that holds a pointer to a scalar, an array, a hash etc, |
| 25 | corresponding to $foo, @foo, %foo. |
| 26 | |
| 27 | GVs are usually found as values in stashes (symbol table hashes) where |
| 28 | Perl stores its global variables. |
| 29 | |
| 30 | =cut |
| 31 | */ |
| 32 | |
| 33 | #include "EXTERN.h" |
| 34 | #define PERL_IN_GV_C |
| 35 | #include "perl.h" |
| 36 | #include "overload.c" |
| 37 | |
| 38 | static const char S_autoload[] = "AUTOLOAD"; |
| 39 | static const STRLEN S_autolen = sizeof(S_autoload)-1; |
| 40 | |
| 41 | |
| 42 | #ifdef PERL_DONT_CREATE_GVSV |
| 43 | GV * |
| 44 | Perl_gv_SVadd(pTHX_ GV *gv) |
| 45 | { |
| 46 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) |
| 47 | Perl_croak(aTHX_ "Bad symbol for scalar"); |
| 48 | if (!GvSV(gv)) |
| 49 | GvSV(gv) = newSV(0); |
| 50 | return gv; |
| 51 | } |
| 52 | #endif |
| 53 | |
| 54 | GV * |
| 55 | Perl_gv_AVadd(pTHX_ register GV *gv) |
| 56 | { |
| 57 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) |
| 58 | Perl_croak(aTHX_ "Bad symbol for array"); |
| 59 | if (!GvAV(gv)) |
| 60 | GvAV(gv) = newAV(); |
| 61 | return gv; |
| 62 | } |
| 63 | |
| 64 | GV * |
| 65 | Perl_gv_HVadd(pTHX_ register GV *gv) |
| 66 | { |
| 67 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) |
| 68 | Perl_croak(aTHX_ "Bad symbol for hash"); |
| 69 | if (!GvHV(gv)) |
| 70 | GvHV(gv) = newHV(); |
| 71 | return gv; |
| 72 | } |
| 73 | |
| 74 | GV * |
| 75 | Perl_gv_IOadd(pTHX_ register GV *gv) |
| 76 | { |
| 77 | dVAR; |
| 78 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) { |
| 79 | |
| 80 | /* |
| 81 | * if it walks like a dirhandle, then let's assume that |
| 82 | * this is a dirhandle. |
| 83 | */ |
| 84 | const char * const fh = |
| 85 | PL_op->op_type == OP_READDIR || |
| 86 | PL_op->op_type == OP_TELLDIR || |
| 87 | PL_op->op_type == OP_SEEKDIR || |
| 88 | PL_op->op_type == OP_REWINDDIR || |
| 89 | PL_op->op_type == OP_CLOSEDIR ? |
| 90 | "dirhandle" : "filehandle"; |
| 91 | Perl_croak(aTHX_ "Bad symbol for %s", fh); |
| 92 | } |
| 93 | |
| 94 | if (!GvIOp(gv)) { |
| 95 | #ifdef GV_UNIQUE_CHECK |
| 96 | if (GvUNIQUE(gv)) { |
| 97 | Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)"); |
| 98 | } |
| 99 | #endif |
| 100 | GvIOp(gv) = newIO(); |
| 101 | } |
| 102 | return gv; |
| 103 | } |
| 104 | |
| 105 | GV * |
| 106 | Perl_gv_fetchfile(pTHX_ const char *name) |
| 107 | { |
| 108 | return gv_fetchfile_flags(name, strlen(name), 0); |
| 109 | } |
| 110 | |
| 111 | GV * |
| 112 | Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen, |
| 113 | const U32 flags) |
| 114 | { |
| 115 | dVAR; |
| 116 | char smallbuf[128]; |
| 117 | char *tmpbuf; |
| 118 | const STRLEN tmplen = namelen + 2; |
| 119 | GV *gv; |
| 120 | |
| 121 | PERL_UNUSED_ARG(flags); |
| 122 | |
| 123 | if (!PL_defstash) |
| 124 | return NULL; |
| 125 | |
| 126 | if (tmplen <= sizeof smallbuf) |
| 127 | tmpbuf = smallbuf; |
| 128 | else |
| 129 | Newx(tmpbuf, tmplen, char); |
| 130 | /* This is where the debugger's %{"::_<$filename"} hash is created */ |
| 131 | tmpbuf[0] = '_'; |
| 132 | tmpbuf[1] = '<'; |
| 133 | memcpy(tmpbuf + 2, name, namelen); |
| 134 | gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE); |
| 135 | if (!isGV(gv)) { |
| 136 | gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE); |
| 137 | #ifdef PERL_DONT_CREATE_GVSV |
| 138 | GvSV(gv) = newSVpvn(name, namelen); |
| 139 | #else |
| 140 | sv_setpvn(GvSV(gv), name, namelen); |
| 141 | #endif |
| 142 | if (PERLDB_LINE) |
| 143 | hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile); |
| 144 | } |
| 145 | if (tmpbuf != smallbuf) |
| 146 | Safefree(tmpbuf); |
| 147 | return gv; |
| 148 | } |
| 149 | |
| 150 | /* |
| 151 | =for apidoc gv_const_sv |
| 152 | |
| 153 | If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for |
| 154 | inlining, or C<gv> is a placeholder reference that would be promoted to such |
| 155 | a typeglob, then returns the value returned by the sub. Otherwise, returns |
| 156 | NULL. |
| 157 | |
| 158 | =cut |
| 159 | */ |
| 160 | |
| 161 | SV * |
| 162 | Perl_gv_const_sv(pTHX_ GV *gv) |
| 163 | { |
| 164 | if (SvTYPE(gv) == SVt_PVGV) |
| 165 | return cv_const_sv(GvCVu(gv)); |
| 166 | return SvROK(gv) ? SvRV(gv) : NULL; |
| 167 | } |
| 168 | |
| 169 | GP * |
| 170 | Perl_newGP(pTHX_ GV *const gv) |
| 171 | { |
| 172 | GP *gp; |
| 173 | U32 hash; |
| 174 | #ifdef USE_ITHREADS |
| 175 | const char *const file |
| 176 | = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : ""; |
| 177 | const STRLEN len = strlen(file); |
| 178 | #else |
| 179 | SV *const temp_sv = CopFILESV(PL_curcop); |
| 180 | const char *file; |
| 181 | STRLEN len; |
| 182 | |
| 183 | if (temp_sv) { |
| 184 | file = SvPVX(temp_sv); |
| 185 | len = SvCUR(temp_sv); |
| 186 | } else { |
| 187 | file = ""; |
| 188 | len = 0; |
| 189 | } |
| 190 | #endif |
| 191 | |
| 192 | PERL_HASH(hash, file, len); |
| 193 | |
| 194 | Newxz(gp, 1, GP); |
| 195 | |
| 196 | #ifndef PERL_DONT_CREATE_GVSV |
| 197 | gp->gp_sv = newSV(0); |
| 198 | #endif |
| 199 | |
| 200 | gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0; |
| 201 | /* XXX Ideally this cast would be replaced with a change to const char* |
| 202 | in the struct. */ |
| 203 | gp->gp_file_hek = share_hek(file, len, hash); |
| 204 | gp->gp_egv = gv; |
| 205 | gp->gp_refcnt = 1; |
| 206 | |
| 207 | return gp; |
| 208 | } |
| 209 | |
| 210 | void |
| 211 | Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi) |
| 212 | { |
| 213 | dVAR; |
| 214 | const U32 old_type = SvTYPE(gv); |
| 215 | const bool doproto = old_type > SVt_NULL; |
| 216 | char * const proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL; |
| 217 | const STRLEN protolen = proto ? SvCUR(gv) : 0; |
| 218 | SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL; |
| 219 | const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0; |
| 220 | |
| 221 | assert (!(proto && has_constant)); |
| 222 | |
| 223 | if (has_constant) { |
| 224 | /* The constant has to be a simple scalar type. */ |
| 225 | switch (SvTYPE(has_constant)) { |
| 226 | case SVt_PVAV: |
| 227 | case SVt_PVHV: |
| 228 | case SVt_PVCV: |
| 229 | case SVt_PVFM: |
| 230 | case SVt_PVIO: |
| 231 | Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob", |
| 232 | sv_reftype(has_constant, 0)); |
| 233 | default: NOOP; |
| 234 | } |
| 235 | SvRV_set(gv, NULL); |
| 236 | SvROK_off(gv); |
| 237 | } |
| 238 | |
| 239 | |
| 240 | if (old_type < SVt_PVGV) { |
| 241 | if (old_type >= SVt_PV) |
| 242 | SvCUR_set(gv, 0); |
| 243 | sv_upgrade((SV*)gv, SVt_PVGV); |
| 244 | } |
| 245 | if (SvLEN(gv)) { |
| 246 | if (proto) { |
| 247 | SvPV_set(gv, NULL); |
| 248 | SvLEN_set(gv, 0); |
| 249 | SvPOK_off(gv); |
| 250 | } else |
| 251 | Safefree(SvPVX_mutable(gv)); |
| 252 | } |
| 253 | SvIOK_off(gv); |
| 254 | isGV_with_GP_on(gv); |
| 255 | |
| 256 | GvGP(gv) = Perl_newGP(aTHX_ gv); |
| 257 | GvSTASH(gv) = stash; |
| 258 | if (stash) |
| 259 | Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv); |
| 260 | gv_name_set(gv, name, len, GV_ADD); |
| 261 | if (multi || doproto) /* doproto means it _was_ mentioned */ |
| 262 | GvMULTI_on(gv); |
| 263 | if (doproto) { /* Replicate part of newSUB here. */ |
| 264 | ENTER; |
| 265 | if (has_constant) { |
| 266 | /* newCONSTSUB takes ownership of the reference from us. */ |
| 267 | GvCV(gv) = newCONSTSUB(stash, name, has_constant); |
| 268 | /* If this reference was a copy of another, then the subroutine |
| 269 | must have been "imported", by a Perl space assignment to a GV |
| 270 | from a reference to CV. */ |
| 271 | if (exported_constant) |
| 272 | GvIMPORTED_CV_on(gv); |
| 273 | } else { |
| 274 | (void) start_subparse(0,0); /* Create empty CV in compcv. */ |
| 275 | GvCV(gv) = PL_compcv; |
| 276 | } |
| 277 | LEAVE; |
| 278 | |
| 279 | mro_method_changed_in(GvSTASH(gv)); /* sub Foo::bar($) { (shift) } sub ASDF::baz($); *ASDF::baz = \&Foo::bar */ |
| 280 | CvGV(GvCV(gv)) = gv; |
| 281 | CvFILE_set_from_cop(GvCV(gv), PL_curcop); |
| 282 | CvSTASH(GvCV(gv)) = PL_curstash; |
| 283 | if (proto) { |
| 284 | sv_usepvn_flags((SV*)GvCV(gv), proto, protolen, |
| 285 | SV_HAS_TRAILING_NUL); |
| 286 | } |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | STATIC void |
| 291 | S_gv_init_sv(pTHX_ GV *gv, I32 sv_type) |
| 292 | { |
| 293 | switch (sv_type) { |
| 294 | case SVt_PVIO: |
| 295 | (void)GvIOn(gv); |
| 296 | break; |
| 297 | case SVt_PVAV: |
| 298 | (void)GvAVn(gv); |
| 299 | break; |
| 300 | case SVt_PVHV: |
| 301 | (void)GvHVn(gv); |
| 302 | break; |
| 303 | #ifdef PERL_DONT_CREATE_GVSV |
| 304 | case SVt_NULL: |
| 305 | case SVt_PVCV: |
| 306 | case SVt_PVFM: |
| 307 | case SVt_PVGV: |
| 308 | break; |
| 309 | default: |
| 310 | if(GvSVn(gv)) { |
| 311 | /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13 |
| 312 | If we just cast GvSVn(gv) to void, it ignores evaluating it for |
| 313 | its side effect */ |
| 314 | } |
| 315 | #endif |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | =for apidoc gv_fetchmeth |
| 321 | |
| 322 | Returns the glob with the given C<name> and a defined subroutine or |
| 323 | C<NULL>. The glob lives in the given C<stash>, or in the stashes |
| 324 | accessible via @ISA and UNIVERSAL::. |
| 325 | |
| 326 | The argument C<level> should be either 0 or -1. If C<level==0>, as a |
| 327 | side-effect creates a glob with the given C<name> in the given C<stash> |
| 328 | which in the case of success contains an alias for the subroutine, and sets |
| 329 | up caching info for this glob. |
| 330 | |
| 331 | This function grants C<"SUPER"> token as a postfix of the stash name. The |
| 332 | GV returned from C<gv_fetchmeth> may be a method cache entry, which is not |
| 333 | visible to Perl code. So when calling C<call_sv>, you should not use |
| 334 | the GV directly; instead, you should use the method's CV, which can be |
| 335 | obtained from the GV with the C<GvCV> macro. |
| 336 | |
| 337 | =cut |
| 338 | */ |
| 339 | |
| 340 | /* NOTE: No support for tied ISA */ |
| 341 | |
| 342 | GV * |
| 343 | Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level) |
| 344 | { |
| 345 | dVAR; |
| 346 | GV** gvp; |
| 347 | AV* linear_av; |
| 348 | SV** linear_svp; |
| 349 | SV* linear_sv; |
| 350 | HV* cstash; |
| 351 | GV* candidate = NULL; |
| 352 | CV* cand_cv = NULL; |
| 353 | CV* old_cv; |
| 354 | GV* topgv = NULL; |
| 355 | const char *hvname; |
| 356 | I32 create = (level >= 0) ? 1 : 0; |
| 357 | I32 items; |
| 358 | STRLEN packlen; |
| 359 | U32 topgen_cmp; |
| 360 | |
| 361 | /* UNIVERSAL methods should be callable without a stash */ |
| 362 | if (!stash) { |
| 363 | create = 0; /* probably appropriate */ |
| 364 | if(!(stash = gv_stashpvs("UNIVERSAL", 0))) |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | assert(stash); |
| 369 | |
| 370 | hvname = HvNAME_get(stash); |
| 371 | if (!hvname) |
| 372 | Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup"); |
| 373 | |
| 374 | assert(hvname); |
| 375 | assert(name); |
| 376 | |
| 377 | DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) ); |
| 378 | |
| 379 | topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation; |
| 380 | |
| 381 | /* check locally for a real method or a cache entry */ |
| 382 | gvp = (GV**)hv_fetch(stash, name, len, create); |
| 383 | if(gvp) { |
| 384 | topgv = *gvp; |
| 385 | assert(topgv); |
| 386 | if (SvTYPE(topgv) != SVt_PVGV) |
| 387 | gv_init(topgv, stash, name, len, TRUE); |
| 388 | if ((cand_cv = GvCV(topgv))) { |
| 389 | /* If genuine method or valid cache entry, use it */ |
| 390 | if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) { |
| 391 | return topgv; |
| 392 | } |
| 393 | else { |
| 394 | /* stale cache entry, junk it and move on */ |
| 395 | SvREFCNT_dec(cand_cv); |
| 396 | GvCV(topgv) = cand_cv = NULL; |
| 397 | GvCVGEN(topgv) = 0; |
| 398 | } |
| 399 | } |
| 400 | else if (GvCVGEN(topgv) == topgen_cmp) { |
| 401 | /* cache indicates no such method definitively */ |
| 402 | return 0; |
| 403 | } |
| 404 | } |
| 405 | |
| 406 | packlen = HvNAMELEN_get(stash); |
| 407 | if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) { |
| 408 | HV* basestash; |
| 409 | packlen -= 7; |
| 410 | basestash = gv_stashpvn(hvname, packlen, GV_ADD); |
| 411 | linear_av = mro_get_linear_isa(basestash); |
| 412 | } |
| 413 | else { |
| 414 | linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */ |
| 415 | } |
| 416 | |
| 417 | linear_svp = AvARRAY(linear_av) + 1; /* skip over self */ |
| 418 | items = AvFILLp(linear_av); /* no +1, to skip over self */ |
| 419 | while (items--) { |
| 420 | linear_sv = *linear_svp++; |
| 421 | assert(linear_sv); |
| 422 | cstash = gv_stashsv(linear_sv, 0); |
| 423 | |
| 424 | if (!cstash) { |
| 425 | if (ckWARN(WARN_SYNTAX)) |
| 426 | Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA", |
| 427 | SVfARG(linear_sv), hvname); |
| 428 | continue; |
| 429 | } |
| 430 | |
| 431 | assert(cstash); |
| 432 | |
| 433 | gvp = (GV**)hv_fetch(cstash, name, len, 0); |
| 434 | if (!gvp) continue; |
| 435 | candidate = *gvp; |
| 436 | assert(candidate); |
| 437 | if (SvTYPE(candidate) != SVt_PVGV) gv_init(candidate, cstash, name, len, TRUE); |
| 438 | if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { |
| 439 | /* |
| 440 | * Found real method, cache method in topgv if: |
| 441 | * 1. topgv has no synonyms (else inheritance crosses wires) |
| 442 | * 2. method isn't a stub (else AUTOLOAD fails spectacularly) |
| 443 | */ |
| 444 | if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) { |
| 445 | if ((old_cv = GvCV(topgv))) SvREFCNT_dec(old_cv); |
| 446 | SvREFCNT_inc_simple_void_NN(cand_cv); |
| 447 | GvCV(topgv) = cand_cv; |
| 448 | GvCVGEN(topgv) = topgen_cmp; |
| 449 | } |
| 450 | return candidate; |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | /* Check UNIVERSAL without caching */ |
| 455 | if(level == 0 || level == -1) { |
| 456 | candidate = gv_fetchmeth(NULL, name, len, 1); |
| 457 | if(candidate) { |
| 458 | cand_cv = GvCV(candidate); |
| 459 | if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) { |
| 460 | if ((old_cv = GvCV(topgv))) SvREFCNT_dec(old_cv); |
| 461 | SvREFCNT_inc_simple_void_NN(cand_cv); |
| 462 | GvCV(topgv) = cand_cv; |
| 463 | GvCVGEN(topgv) = topgen_cmp; |
| 464 | } |
| 465 | return candidate; |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | if (topgv && GvREFCNT(topgv) == 1) { |
| 470 | /* cache the fact that the method is not defined */ |
| 471 | GvCVGEN(topgv) = topgen_cmp; |
| 472 | } |
| 473 | |
| 474 | return 0; |
| 475 | } |
| 476 | |
| 477 | /* |
| 478 | =for apidoc gv_fetchmeth_autoload |
| 479 | |
| 480 | Same as gv_fetchmeth(), but looks for autoloaded subroutines too. |
| 481 | Returns a glob for the subroutine. |
| 482 | |
| 483 | For an autoloaded subroutine without a GV, will create a GV even |
| 484 | if C<level < 0>. For an autoloaded subroutine without a stub, GvCV() |
| 485 | of the result may be zero. |
| 486 | |
| 487 | =cut |
| 488 | */ |
| 489 | |
| 490 | GV * |
| 491 | Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level) |
| 492 | { |
| 493 | GV *gv = gv_fetchmeth(stash, name, len, level); |
| 494 | |
| 495 | if (!gv) { |
| 496 | CV *cv; |
| 497 | GV **gvp; |
| 498 | |
| 499 | if (!stash) |
| 500 | return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */ |
| 501 | if (len == S_autolen && strnEQ(name, S_autoload, S_autolen)) |
| 502 | return NULL; |
| 503 | if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE))) |
| 504 | return NULL; |
| 505 | cv = GvCV(gv); |
| 506 | if (!(CvROOT(cv) || CvXSUB(cv))) |
| 507 | return NULL; |
| 508 | /* Have an autoload */ |
| 509 | if (level < 0) /* Cannot do without a stub */ |
| 510 | gv_fetchmeth(stash, name, len, 0); |
| 511 | gvp = (GV**)hv_fetch(stash, name, len, (level >= 0)); |
| 512 | if (!gvp) |
| 513 | return NULL; |
| 514 | return *gvp; |
| 515 | } |
| 516 | return gv; |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | =for apidoc gv_fetchmethod_autoload |
| 521 | |
| 522 | Returns the glob which contains the subroutine to call to invoke the method |
| 523 | on the C<stash>. In fact in the presence of autoloading this may be the |
| 524 | glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is |
| 525 | already setup. |
| 526 | |
| 527 | The third parameter of C<gv_fetchmethod_autoload> determines whether |
| 528 | AUTOLOAD lookup is performed if the given method is not present: non-zero |
| 529 | means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD. |
| 530 | Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload> |
| 531 | with a non-zero C<autoload> parameter. |
| 532 | |
| 533 | These functions grant C<"SUPER"> token as a prefix of the method name. Note |
| 534 | that if you want to keep the returned glob for a long time, you need to |
| 535 | check for it being "AUTOLOAD", since at the later time the call may load a |
| 536 | different subroutine due to $AUTOLOAD changing its value. Use the glob |
| 537 | created via a side effect to do this. |
| 538 | |
| 539 | These functions have the same side-effects and as C<gv_fetchmeth> with |
| 540 | C<level==0>. C<name> should be writable if contains C<':'> or C<' |
| 541 | ''>. The warning against passing the GV returned by C<gv_fetchmeth> to |
| 542 | C<call_sv> apply equally to these functions. |
| 543 | |
| 544 | =cut |
| 545 | */ |
| 546 | |
| 547 | STATIC HV* |
| 548 | S_gv_get_super_pkg(pTHX_ const char* name, I32 namelen) |
| 549 | { |
| 550 | AV* superisa; |
| 551 | GV** gvp; |
| 552 | GV* gv; |
| 553 | HV* stash; |
| 554 | |
| 555 | stash = gv_stashpvn(name, namelen, 0); |
| 556 | if(stash) return stash; |
| 557 | |
| 558 | /* If we must create it, give it an @ISA array containing |
| 559 | the real package this SUPER is for, so that it's tied |
| 560 | into the cache invalidation code correctly */ |
| 561 | stash = gv_stashpvn(name, namelen, GV_ADD); |
| 562 | gvp = (GV**)hv_fetchs(stash, "ISA", TRUE); |
| 563 | gv = *gvp; |
| 564 | gv_init(gv, stash, "ISA", 3, TRUE); |
| 565 | superisa = GvAVn(gv); |
| 566 | GvMULTI_on(gv); |
| 567 | sv_magic((SV*)superisa, (SV*)gv, PERL_MAGIC_isa, NULL, 0); |
| 568 | #ifdef USE_ITHREADS |
| 569 | av_push(superisa, newSVpv(CopSTASHPV(PL_curcop), 0)); |
| 570 | #else |
| 571 | av_push(superisa, newSVhek(CopSTASH(PL_curcop) |
| 572 | ? HvNAME_HEK(CopSTASH(PL_curcop)) : NULL)); |
| 573 | #endif |
| 574 | |
| 575 | return stash; |
| 576 | } |
| 577 | |
| 578 | /* FIXME. If changing this function note the comment in pp_hot's |
| 579 | S_method_common: |
| 580 | |
| 581 | This code tries to figure out just what went wrong with |
| 582 | gv_fetchmethod. It therefore needs to duplicate a lot of |
| 583 | the internals of that function. ... |
| 584 | |
| 585 | I'd guess that with one more flag bit that could all be moved inside |
| 586 | here. |
| 587 | */ |
| 588 | |
| 589 | GV * |
| 590 | Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload) |
| 591 | { |
| 592 | dVAR; |
| 593 | register const char *nend; |
| 594 | const char *nsplit = NULL; |
| 595 | GV* gv; |
| 596 | HV* ostash = stash; |
| 597 | |
| 598 | if (stash && SvTYPE(stash) < SVt_PVHV) |
| 599 | stash = NULL; |
| 600 | |
| 601 | for (nend = name; *nend; nend++) { |
| 602 | if (*nend == '\'') |
| 603 | nsplit = nend; |
| 604 | else if (*nend == ':' && *(nend + 1) == ':') |
| 605 | nsplit = ++nend; |
| 606 | } |
| 607 | if (nsplit) { |
| 608 | const char * const origname = name; |
| 609 | name = nsplit + 1; |
| 610 | if (*nsplit == ':') |
| 611 | --nsplit; |
| 612 | if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) { |
| 613 | /* ->SUPER::method should really be looked up in original stash */ |
| 614 | SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER", |
| 615 | CopSTASHPV(PL_curcop))); |
| 616 | /* __PACKAGE__::SUPER stash should be autovivified */ |
| 617 | stash = gv_get_super_pkg(SvPVX_const(tmpstr), SvCUR(tmpstr)); |
| 618 | DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n", |
| 619 | origname, HvNAME_get(stash), name) ); |
| 620 | } |
| 621 | else { |
| 622 | /* don't autovifify if ->NoSuchStash::method */ |
| 623 | stash = gv_stashpvn(origname, nsplit - origname, 0); |
| 624 | |
| 625 | /* however, explicit calls to Pkg::SUPER::method may |
| 626 | happen, and may require autovivification to work */ |
| 627 | if (!stash && (nsplit - origname) >= 7 && |
| 628 | strnEQ(nsplit - 7, "::SUPER", 7) && |
| 629 | gv_stashpvn(origname, nsplit - origname - 7, 0)) |
| 630 | stash = gv_get_super_pkg(origname, nsplit - origname); |
| 631 | } |
| 632 | ostash = stash; |
| 633 | } |
| 634 | |
| 635 | gv = gv_fetchmeth(stash, name, nend - name, 0); |
| 636 | if (!gv) { |
| 637 | if (strEQ(name,"import") || strEQ(name,"unimport")) |
| 638 | gv = (GV*)&PL_sv_yes; |
| 639 | else if (autoload) |
| 640 | gv = gv_autoload4(ostash, name, nend - name, TRUE); |
| 641 | } |
| 642 | else if (autoload) { |
| 643 | CV* const cv = GvCV(gv); |
| 644 | if (!CvROOT(cv) && !CvXSUB(cv)) { |
| 645 | GV* stubgv; |
| 646 | GV* autogv; |
| 647 | |
| 648 | if (CvANON(cv)) |
| 649 | stubgv = gv; |
| 650 | else { |
| 651 | stubgv = CvGV(cv); |
| 652 | if (GvCV(stubgv) != cv) /* orphaned import */ |
| 653 | stubgv = gv; |
| 654 | } |
| 655 | autogv = gv_autoload4(GvSTASH(stubgv), |
| 656 | GvNAME(stubgv), GvNAMELEN(stubgv), TRUE); |
| 657 | if (autogv) |
| 658 | gv = autogv; |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | return gv; |
| 663 | } |
| 664 | |
| 665 | GV* |
| 666 | Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method) |
| 667 | { |
| 668 | dVAR; |
| 669 | GV* gv; |
| 670 | CV* cv; |
| 671 | HV* varstash; |
| 672 | GV* vargv; |
| 673 | SV* varsv; |
| 674 | const char *packname = ""; |
| 675 | STRLEN packname_len = 0; |
| 676 | |
| 677 | if (len == S_autolen && strnEQ(name, S_autoload, S_autolen)) |
| 678 | return NULL; |
| 679 | if (stash) { |
| 680 | if (SvTYPE(stash) < SVt_PVHV) { |
| 681 | packname = SvPV_const((SV*)stash, packname_len); |
| 682 | stash = NULL; |
| 683 | } |
| 684 | else { |
| 685 | packname = HvNAME_get(stash); |
| 686 | packname_len = HvNAMELEN_get(stash); |
| 687 | } |
| 688 | } |
| 689 | if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE))) |
| 690 | return NULL; |
| 691 | cv = GvCV(gv); |
| 692 | |
| 693 | if (!(CvROOT(cv) || CvXSUB(cv))) |
| 694 | return NULL; |
| 695 | |
| 696 | /* |
| 697 | * Inheriting AUTOLOAD for non-methods works ... for now. |
| 698 | */ |
| 699 | if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash) |
| 700 | && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) |
| 701 | ) |
| 702 | Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX), |
| 703 | "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated", |
| 704 | packname, (int)len, name); |
| 705 | |
| 706 | if (CvISXSUB(cv)) { |
| 707 | /* rather than lookup/init $AUTOLOAD here |
| 708 | * only to have the XSUB do another lookup for $AUTOLOAD |
| 709 | * and split that value on the last '::', |
| 710 | * pass along the same data via some unused fields in the CV |
| 711 | */ |
| 712 | CvSTASH(cv) = stash; |
| 713 | SvPV_set(cv, (char *)name); /* cast to lose constness warning */ |
| 714 | SvCUR_set(cv, len); |
| 715 | return gv; |
| 716 | } |
| 717 | |
| 718 | /* |
| 719 | * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name. |
| 720 | * The subroutine's original name may not be "AUTOLOAD", so we don't |
| 721 | * use that, but for lack of anything better we will use the sub's |
| 722 | * original package to look up $AUTOLOAD. |
| 723 | */ |
| 724 | varstash = GvSTASH(CvGV(cv)); |
| 725 | vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE); |
| 726 | ENTER; |
| 727 | |
| 728 | if (!isGV(vargv)) { |
| 729 | gv_init(vargv, varstash, S_autoload, S_autolen, FALSE); |
| 730 | #ifdef PERL_DONT_CREATE_GVSV |
| 731 | GvSV(vargv) = newSV(0); |
| 732 | #endif |
| 733 | } |
| 734 | LEAVE; |
| 735 | varsv = GvSVn(vargv); |
| 736 | sv_setpvn(varsv, packname, packname_len); |
| 737 | sv_catpvs(varsv, "::"); |
| 738 | sv_catpvn(varsv, name, len); |
| 739 | return gv; |
| 740 | } |
| 741 | |
| 742 | |
| 743 | /* require_tie_mod() internal routine for requiring a module |
| 744 | * that implements the logic of automatical ties like %! and %- |
| 745 | * |
| 746 | * The "gv" parameter should be the glob. |
| 747 | * "varpv" holds the name of the var, used for error messages. |
| 748 | * "namesv" holds the module name. Its refcount will be decremented. |
| 749 | * "methpv" holds the method name to test for to check that things |
| 750 | * are working reasonably close to as expected. |
| 751 | * "flags": if flag & 1 then save the scalar before loading. |
| 752 | * For the protection of $! to work (it is set by this routine) |
| 753 | * the sv slot must already be magicalized. |
| 754 | */ |
| 755 | STATIC HV* |
| 756 | S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags) |
| 757 | { |
| 758 | dVAR; |
| 759 | HV* stash = gv_stashsv(namesv, 0); |
| 760 | |
| 761 | if (!stash || !(gv_fetchmethod(stash, methpv))) { |
| 762 | SV *module = newSVsv(namesv); |
| 763 | char varname = *varpv; /* varpv might be clobbered by load_module, |
| 764 | so save it. For the moment it's always |
| 765 | a single char. */ |
| 766 | dSP; |
| 767 | ENTER; |
| 768 | if ( flags & 1 ) |
| 769 | save_scalar(gv); |
| 770 | PUSHSTACKi(PERLSI_MAGIC); |
| 771 | Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL); |
| 772 | POPSTACK; |
| 773 | LEAVE; |
| 774 | SPAGAIN; |
| 775 | stash = gv_stashsv(namesv, 0); |
| 776 | if (!stash) |
| 777 | Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available", |
| 778 | varname, SVfARG(namesv)); |
| 779 | else if (!gv_fetchmethod(stash, methpv)) |
| 780 | Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s", |
| 781 | varname, SVfARG(namesv), methpv); |
| 782 | } |
| 783 | SvREFCNT_dec(namesv); |
| 784 | return stash; |
| 785 | } |
| 786 | |
| 787 | /* |
| 788 | =for apidoc gv_stashpv |
| 789 | |
| 790 | Returns a pointer to the stash for a specified package. Uses C<strlen> to |
| 791 | determine the length of C<name>, then calls C<gv_stashpvn()>. |
| 792 | |
| 793 | =cut |
| 794 | */ |
| 795 | |
| 796 | HV* |
| 797 | Perl_gv_stashpv(pTHX_ const char *name, I32 create) |
| 798 | { |
| 799 | return gv_stashpvn(name, strlen(name), create); |
| 800 | } |
| 801 | |
| 802 | /* |
| 803 | =for apidoc gv_stashpvn |
| 804 | |
| 805 | Returns a pointer to the stash for a specified package. The C<namelen> |
| 806 | parameter indicates the length of the C<name>, in bytes. C<flags> is passed |
| 807 | to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be |
| 808 | created if it does not already exist. If the package does not exist and |
| 809 | C<flags> is 0 (or any other setting that does not create packages) then NULL |
| 810 | is returned. |
| 811 | |
| 812 | |
| 813 | =cut |
| 814 | */ |
| 815 | |
| 816 | HV* |
| 817 | Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags) |
| 818 | { |
| 819 | char smallbuf[128]; |
| 820 | char *tmpbuf; |
| 821 | HV *stash; |
| 822 | GV *tmpgv; |
| 823 | |
| 824 | if (namelen + 2 <= sizeof smallbuf) |
| 825 | tmpbuf = smallbuf; |
| 826 | else |
| 827 | Newx(tmpbuf, namelen + 2, char); |
| 828 | Copy(name,tmpbuf,namelen,char); |
| 829 | tmpbuf[namelen++] = ':'; |
| 830 | tmpbuf[namelen++] = ':'; |
| 831 | tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, flags, SVt_PVHV); |
| 832 | if (tmpbuf != smallbuf) |
| 833 | Safefree(tmpbuf); |
| 834 | if (!tmpgv) |
| 835 | return NULL; |
| 836 | if (!GvHV(tmpgv)) |
| 837 | GvHV(tmpgv) = newHV(); |
| 838 | stash = GvHV(tmpgv); |
| 839 | if (!HvNAME_get(stash)) |
| 840 | hv_name_set(stash, name, namelen, 0); |
| 841 | return stash; |
| 842 | } |
| 843 | |
| 844 | /* |
| 845 | =for apidoc gv_stashsv |
| 846 | |
| 847 | Returns a pointer to the stash for a specified package. See C<gv_stashpvn>. |
| 848 | |
| 849 | =cut |
| 850 | */ |
| 851 | |
| 852 | HV* |
| 853 | Perl_gv_stashsv(pTHX_ SV *sv, I32 flags) |
| 854 | { |
| 855 | STRLEN len; |
| 856 | const char * const ptr = SvPV_const(sv,len); |
| 857 | return gv_stashpvn(ptr, len, flags); |
| 858 | } |
| 859 | |
| 860 | |
| 861 | GV * |
| 862 | Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) { |
| 863 | return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type); |
| 864 | } |
| 865 | |
| 866 | GV * |
| 867 | Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) { |
| 868 | STRLEN len; |
| 869 | const char * const nambeg = SvPV_const(name, len); |
| 870 | return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type); |
| 871 | } |
| 872 | |
| 873 | GV * |
| 874 | Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags, |
| 875 | I32 sv_type) |
| 876 | { |
| 877 | dVAR; |
| 878 | register const char *name = nambeg; |
| 879 | register GV *gv = NULL; |
| 880 | GV**gvp; |
| 881 | I32 len; |
| 882 | register const char *name_cursor; |
| 883 | HV *stash = NULL; |
| 884 | const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT); |
| 885 | const I32 no_expand = flags & GV_NOEXPAND; |
| 886 | const I32 add = flags & ~GV_NOADD_MASK; |
| 887 | const char *const name_end = nambeg + full_len; |
| 888 | const char *const name_em1 = name_end - 1; |
| 889 | U32 faking_it; |
| 890 | |
| 891 | if (flags & GV_NOTQUAL) { |
| 892 | /* Caller promised that there is no stash, so we can skip the check. */ |
| 893 | len = full_len; |
| 894 | goto no_stash; |
| 895 | } |
| 896 | |
| 897 | if (full_len > 2 && *name == '*' && isALPHA(name[1])) { |
| 898 | /* accidental stringify on a GV? */ |
| 899 | name++; |
| 900 | } |
| 901 | |
| 902 | for (name_cursor = name; name_cursor < name_end; name_cursor++) { |
| 903 | if ((*name_cursor == ':' && name_cursor < name_em1 |
| 904 | && name_cursor[1] == ':') |
| 905 | || (*name_cursor == '\'' && name_cursor[1])) |
| 906 | { |
| 907 | if (!stash) |
| 908 | stash = PL_defstash; |
| 909 | if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */ |
| 910 | return NULL; |
| 911 | |
| 912 | len = name_cursor - name; |
| 913 | if (len > 0) { |
| 914 | char smallbuf[128]; |
| 915 | char *tmpbuf; |
| 916 | |
| 917 | if (len + 2 <= (I32)sizeof (smallbuf)) |
| 918 | tmpbuf = smallbuf; |
| 919 | else |
| 920 | Newx(tmpbuf, len+2, char); |
| 921 | Copy(name, tmpbuf, len, char); |
| 922 | tmpbuf[len++] = ':'; |
| 923 | tmpbuf[len++] = ':'; |
| 924 | gvp = (GV**)hv_fetch(stash,tmpbuf,len,add); |
| 925 | gv = gvp ? *gvp : NULL; |
| 926 | if (gv && gv != (GV*)&PL_sv_undef) { |
| 927 | if (SvTYPE(gv) != SVt_PVGV) |
| 928 | gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI)); |
| 929 | else |
| 930 | GvMULTI_on(gv); |
| 931 | } |
| 932 | if (tmpbuf != smallbuf) |
| 933 | Safefree(tmpbuf); |
| 934 | if (!gv || gv == (GV*)&PL_sv_undef) |
| 935 | return NULL; |
| 936 | |
| 937 | if (!(stash = GvHV(gv))) |
| 938 | stash = GvHV(gv) = newHV(); |
| 939 | |
| 940 | if (!HvNAME_get(stash)) |
| 941 | hv_name_set(stash, nambeg, name_cursor - nambeg, 0); |
| 942 | } |
| 943 | |
| 944 | if (*name_cursor == ':') |
| 945 | name_cursor++; |
| 946 | name_cursor++; |
| 947 | name = name_cursor; |
| 948 | if (name == name_end) |
| 949 | return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE); |
| 950 | } |
| 951 | } |
| 952 | len = name_cursor - name; |
| 953 | |
| 954 | /* No stash in name, so see how we can default */ |
| 955 | |
| 956 | if (!stash) { |
| 957 | no_stash: |
| 958 | if (len && isIDFIRST_lazy(name)) { |
| 959 | bool global = FALSE; |
| 960 | |
| 961 | switch (len) { |
| 962 | case 1: |
| 963 | if (*name == '_') |
| 964 | global = TRUE; |
| 965 | break; |
| 966 | case 3: |
| 967 | if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C') |
| 968 | || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V') |
| 969 | || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G')) |
| 970 | global = TRUE; |
| 971 | break; |
| 972 | case 4: |
| 973 | if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G' |
| 974 | && name[3] == 'V') |
| 975 | global = TRUE; |
| 976 | break; |
| 977 | case 5: |
| 978 | if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D' |
| 979 | && name[3] == 'I' && name[4] == 'N') |
| 980 | global = TRUE; |
| 981 | break; |
| 982 | case 6: |
| 983 | if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D') |
| 984 | &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T') |
| 985 | ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R'))) |
| 986 | global = TRUE; |
| 987 | break; |
| 988 | case 7: |
| 989 | if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G' |
| 990 | && name[3] == 'V' && name[4] == 'O' && name[5] == 'U' |
| 991 | && name[6] == 'T') |
| 992 | global = TRUE; |
| 993 | break; |
| 994 | } |
| 995 | |
| 996 | if (global) |
| 997 | stash = PL_defstash; |
| 998 | else if (IN_PERL_COMPILETIME) { |
| 999 | stash = PL_curstash; |
| 1000 | if (add && (PL_hints & HINT_STRICT_VARS) && |
| 1001 | sv_type != SVt_PVCV && |
| 1002 | sv_type != SVt_PVGV && |
| 1003 | sv_type != SVt_PVFM && |
| 1004 | sv_type != SVt_PVIO && |
| 1005 | !(len == 1 && sv_type == SVt_PV && |
| 1006 | (*name == 'a' || *name == 'b')) ) |
| 1007 | { |
| 1008 | gvp = (GV**)hv_fetch(stash,name,len,0); |
| 1009 | if (!gvp || |
| 1010 | *gvp == (GV*)&PL_sv_undef || |
| 1011 | SvTYPE(*gvp) != SVt_PVGV) |
| 1012 | { |
| 1013 | stash = NULL; |
| 1014 | } |
| 1015 | else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) || |
| 1016 | (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) || |
| 1017 | (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) ) |
| 1018 | { |
| 1019 | Perl_warn(aTHX_ "Variable \"%c%s\" is not imported", |
| 1020 | sv_type == SVt_PVAV ? '@' : |
| 1021 | sv_type == SVt_PVHV ? '%' : '$', |
| 1022 | name); |
| 1023 | if (GvCVu(*gvp)) |
| 1024 | Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name); |
| 1025 | stash = NULL; |
| 1026 | } |
| 1027 | } |
| 1028 | } |
| 1029 | else |
| 1030 | stash = CopSTASH(PL_curcop); |
| 1031 | } |
| 1032 | else |
| 1033 | stash = PL_defstash; |
| 1034 | } |
| 1035 | |
| 1036 | /* By this point we should have a stash and a name */ |
| 1037 | |
| 1038 | if (!stash) { |
| 1039 | if (add) { |
| 1040 | SV * const err = Perl_mess(aTHX_ |
| 1041 | "Global symbol \"%s%s\" requires explicit package name", |
| 1042 | (sv_type == SVt_PV ? "$" |
| 1043 | : sv_type == SVt_PVAV ? "@" |
| 1044 | : sv_type == SVt_PVHV ? "%" |
| 1045 | : ""), name); |
| 1046 | GV *gv; |
| 1047 | if (USE_UTF8_IN_NAMES) |
| 1048 | SvUTF8_on(err); |
| 1049 | qerror(err); |
| 1050 | gv = gv_fetchpvn_flags("<none>::", 8, GV_ADDMULTI, SVt_PVHV); |
| 1051 | if(!gv) { |
| 1052 | /* symbol table under destruction */ |
| 1053 | return NULL; |
| 1054 | } |
| 1055 | stash = GvHV(gv); |
| 1056 | } |
| 1057 | else |
| 1058 | return NULL; |
| 1059 | } |
| 1060 | |
| 1061 | if (!SvREFCNT(stash)) /* symbol table under destruction */ |
| 1062 | return NULL; |
| 1063 | |
| 1064 | gvp = (GV**)hv_fetch(stash,name,len,add); |
| 1065 | if (!gvp || *gvp == (GV*)&PL_sv_undef) |
| 1066 | return NULL; |
| 1067 | gv = *gvp; |
| 1068 | if (SvTYPE(gv) == SVt_PVGV) { |
| 1069 | if (add) { |
| 1070 | GvMULTI_on(gv); |
| 1071 | gv_init_sv(gv, sv_type); |
| 1072 | if (len == 1 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) { |
| 1073 | if (*name == '!') |
| 1074 | require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1); |
| 1075 | else if (*name == '-' || *name == '+') |
| 1076 | require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0); |
| 1077 | } |
| 1078 | } |
| 1079 | return gv; |
| 1080 | } else if (no_init) { |
| 1081 | return gv; |
| 1082 | } else if (no_expand && SvROK(gv)) { |
| 1083 | return gv; |
| 1084 | } |
| 1085 | |
| 1086 | /* Adding a new symbol. |
| 1087 | Unless of course there was already something non-GV here, in which case |
| 1088 | we want to behave as if there was always a GV here, containing some sort |
| 1089 | of subroutine. |
| 1090 | Otherwise we run the risk of creating things like GvIO, which can cause |
| 1091 | subtle bugs. eg the one that tripped up SQL::Translator */ |
| 1092 | |
| 1093 | faking_it = SvOK(gv); |
| 1094 | |
| 1095 | if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL)) |
| 1096 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg); |
| 1097 | gv_init(gv, stash, name, len, add & GV_ADDMULTI); |
| 1098 | gv_init_sv(gv, faking_it ? SVt_PVCV : sv_type); |
| 1099 | |
| 1100 | if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE) |
| 1101 | : (PL_dowarn & G_WARN_ON ) ) ) |
| 1102 | GvMULTI_on(gv) ; |
| 1103 | |
| 1104 | /* set up magic where warranted */ |
| 1105 | if (len > 1) { |
| 1106 | #ifndef EBCDIC |
| 1107 | if (*name > 'V' ) { |
| 1108 | NOOP; |
| 1109 | /* Nothing else to do. |
| 1110 | The compiler will probably turn the switch statement into a |
| 1111 | branch table. Make sure we avoid even that small overhead for |
| 1112 | the common case of lower case variable names. */ |
| 1113 | } else |
| 1114 | #endif |
| 1115 | { |
| 1116 | const char * const name2 = name + 1; |
| 1117 | switch (*name) { |
| 1118 | case 'A': |
| 1119 | if (strEQ(name2, "RGV")) { |
| 1120 | IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START; |
| 1121 | } |
| 1122 | else if (strEQ(name2, "RGVOUT")) { |
| 1123 | GvMULTI_on(gv); |
| 1124 | } |
| 1125 | break; |
| 1126 | case 'E': |
| 1127 | if (strnEQ(name2, "XPORT", 5)) |
| 1128 | GvMULTI_on(gv); |
| 1129 | break; |
| 1130 | case 'I': |
| 1131 | if (strEQ(name2, "SA")) { |
| 1132 | AV* const av = GvAVn(gv); |
| 1133 | GvMULTI_on(gv); |
| 1134 | sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0); |
| 1135 | /* NOTE: No support for tied ISA */ |
| 1136 | if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA") |
| 1137 | && AvFILLp(av) == -1) |
| 1138 | { |
| 1139 | const char *pname; |
| 1140 | av_push(av, newSVpvn(pname = "NDBM_File",9)); |
| 1141 | gv_stashpvn(pname, 9, GV_ADD); |
| 1142 | av_push(av, newSVpvn(pname = "DB_File",7)); |
| 1143 | gv_stashpvn(pname, 7, GV_ADD); |
| 1144 | av_push(av, newSVpvn(pname = "GDBM_File",9)); |
| 1145 | gv_stashpvn(pname, 9, GV_ADD); |
| 1146 | av_push(av, newSVpvn(pname = "SDBM_File",9)); |
| 1147 | gv_stashpvn(pname, 9, GV_ADD); |
| 1148 | av_push(av, newSVpvn(pname = "ODBM_File",9)); |
| 1149 | gv_stashpvn(pname, 9, GV_ADD); |
| 1150 | } |
| 1151 | } |
| 1152 | break; |
| 1153 | case 'O': |
| 1154 | if (strEQ(name2, "VERLOAD")) { |
| 1155 | HV* const hv = GvHVn(gv); |
| 1156 | GvMULTI_on(gv); |
| 1157 | hv_magic(hv, NULL, PERL_MAGIC_overload); |
| 1158 | } |
| 1159 | break; |
| 1160 | case 'S': |
| 1161 | if (strEQ(name2, "IG")) { |
| 1162 | HV *hv; |
| 1163 | I32 i; |
| 1164 | if (!PL_psig_ptr) { |
| 1165 | Newxz(PL_psig_ptr, SIG_SIZE, SV*); |
| 1166 | Newxz(PL_psig_name, SIG_SIZE, SV*); |
| 1167 | Newxz(PL_psig_pend, SIG_SIZE, int); |
| 1168 | } |
| 1169 | GvMULTI_on(gv); |
| 1170 | hv = GvHVn(gv); |
| 1171 | hv_magic(hv, NULL, PERL_MAGIC_sig); |
| 1172 | for (i = 1; i < SIG_SIZE; i++) { |
| 1173 | SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1); |
| 1174 | if (init) |
| 1175 | sv_setsv(*init, &PL_sv_undef); |
| 1176 | PL_psig_ptr[i] = 0; |
| 1177 | PL_psig_name[i] = 0; |
| 1178 | PL_psig_pend[i] = 0; |
| 1179 | } |
| 1180 | } |
| 1181 | break; |
| 1182 | case 'V': |
| 1183 | if (strEQ(name2, "ERSION")) |
| 1184 | GvMULTI_on(gv); |
| 1185 | break; |
| 1186 | case '\003': /* $^CHILD_ERROR_NATIVE */ |
| 1187 | if (strEQ(name2, "HILD_ERROR_NATIVE")) |
| 1188 | goto magicalize; |
| 1189 | break; |
| 1190 | case '\005': /* $^ENCODING */ |
| 1191 | if (strEQ(name2, "NCODING")) |
| 1192 | goto magicalize; |
| 1193 | break; |
| 1194 | case '\015': /* $^MATCH */ |
| 1195 | if (strEQ(name2, "ATCH")) |
| 1196 | goto magicalize; |
| 1197 | case '\017': /* $^OPEN */ |
| 1198 | if (strEQ(name2, "PEN")) |
| 1199 | goto magicalize; |
| 1200 | break; |
| 1201 | case '\020': /* $^PREMATCH $^POSTMATCH */ |
| 1202 | if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH")) |
| 1203 | goto magicalize; |
| 1204 | case '\024': /* ${^TAINT} */ |
| 1205 | if (strEQ(name2, "AINT")) |
| 1206 | goto ro_magicalize; |
| 1207 | break; |
| 1208 | case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */ |
| 1209 | if (strEQ(name2, "NICODE")) |
| 1210 | goto ro_magicalize; |
| 1211 | if (strEQ(name2, "TF8LOCALE")) |
| 1212 | goto ro_magicalize; |
| 1213 | if (strEQ(name2, "TF8CACHE")) |
| 1214 | goto magicalize; |
| 1215 | break; |
| 1216 | case '\027': /* $^WARNING_BITS */ |
| 1217 | if (strEQ(name2, "ARNING_BITS")) |
| 1218 | goto magicalize; |
| 1219 | break; |
| 1220 | case '1': |
| 1221 | case '2': |
| 1222 | case '3': |
| 1223 | case '4': |
| 1224 | case '5': |
| 1225 | case '6': |
| 1226 | case '7': |
| 1227 | case '8': |
| 1228 | case '9': |
| 1229 | { |
| 1230 | /* Ensures that we have an all-digit variable, ${"1foo"} fails |
| 1231 | this test */ |
| 1232 | /* This snippet is taken from is_gv_magical */ |
| 1233 | const char *end = name + len; |
| 1234 | while (--end > name) { |
| 1235 | if (!isDIGIT(*end)) return gv; |
| 1236 | } |
| 1237 | goto magicalize; |
| 1238 | } |
| 1239 | } |
| 1240 | } |
| 1241 | } else { |
| 1242 | /* Names of length 1. (Or 0. But name is NUL terminated, so that will |
| 1243 | be case '\0' in this switch statement (ie a default case) */ |
| 1244 | switch (*name) { |
| 1245 | case '&': |
| 1246 | case '`': |
| 1247 | case '\'': |
| 1248 | if ( |
| 1249 | sv_type == SVt_PVAV || |
| 1250 | sv_type == SVt_PVHV || |
| 1251 | sv_type == SVt_PVCV || |
| 1252 | sv_type == SVt_PVFM || |
| 1253 | sv_type == SVt_PVIO |
| 1254 | ) { break; } |
| 1255 | PL_sawampersand = TRUE; |
| 1256 | goto magicalize; |
| 1257 | |
| 1258 | case ':': |
| 1259 | sv_setpv(GvSVn(gv),PL_chopset); |
| 1260 | goto magicalize; |
| 1261 | |
| 1262 | case '?': |
| 1263 | #ifdef COMPLEX_STATUS |
| 1264 | SvUPGRADE(GvSVn(gv), SVt_PVLV); |
| 1265 | #endif |
| 1266 | goto magicalize; |
| 1267 | |
| 1268 | case '!': |
| 1269 | GvMULTI_on(gv); |
| 1270 | /* If %! has been used, automatically load Errno.pm. */ |
| 1271 | |
| 1272 | sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len); |
| 1273 | |
| 1274 | /* magicalization must be done before require_tie_mod is called */ |
| 1275 | if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) |
| 1276 | require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1); |
| 1277 | |
| 1278 | break; |
| 1279 | case '-': |
| 1280 | case '+': |
| 1281 | GvMULTI_on(gv); /* no used once warnings here */ |
| 1282 | { |
| 1283 | AV* const av = GvAVn(gv); |
| 1284 | SV* const avc = (*name == '+') ? (SV*)av : NULL; |
| 1285 | |
| 1286 | sv_magic((SV*)av, avc, PERL_MAGIC_regdata, NULL, 0); |
| 1287 | sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len); |
| 1288 | if (avc) |
| 1289 | SvREADONLY_on(GvSVn(gv)); |
| 1290 | SvREADONLY_on(av); |
| 1291 | |
| 1292 | if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) |
| 1293 | require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0); |
| 1294 | |
| 1295 | break; |
| 1296 | } |
| 1297 | case '*': |
| 1298 | case '#': |
| 1299 | if (sv_type == SVt_PV && ckWARN2_d(WARN_DEPRECATED, WARN_SYNTAX)) |
| 1300 | Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX), |
| 1301 | "$%c is no longer supported", *name); |
| 1302 | break; |
| 1303 | case '|': |
| 1304 | sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0); |
| 1305 | goto magicalize; |
| 1306 | |
| 1307 | case '\010': /* $^H */ |
| 1308 | { |
| 1309 | HV *const hv = GvHVn(gv); |
| 1310 | hv_magic(hv, NULL, PERL_MAGIC_hints); |
| 1311 | } |
| 1312 | goto magicalize; |
| 1313 | case '\023': /* $^S */ |
| 1314 | ro_magicalize: |
| 1315 | SvREADONLY_on(GvSVn(gv)); |
| 1316 | /* FALL THROUGH */ |
| 1317 | case '1': |
| 1318 | case '2': |
| 1319 | case '3': |
| 1320 | case '4': |
| 1321 | case '5': |
| 1322 | case '6': |
| 1323 | case '7': |
| 1324 | case '8': |
| 1325 | case '9': |
| 1326 | case '[': |
| 1327 | case '^': |
| 1328 | case '~': |
| 1329 | case '=': |
| 1330 | case '%': |
| 1331 | case '.': |
| 1332 | case '(': |
| 1333 | case ')': |
| 1334 | case '<': |
| 1335 | case '>': |
| 1336 | case ',': |
| 1337 | case '\\': |
| 1338 | case '/': |
| 1339 | case '\001': /* $^A */ |
| 1340 | case '\003': /* $^C */ |
| 1341 | case '\004': /* $^D */ |
| 1342 | case '\005': /* $^E */ |
| 1343 | case '\006': /* $^F */ |
| 1344 | case '\011': /* $^I, NOT \t in EBCDIC */ |
| 1345 | case '\016': /* $^N */ |
| 1346 | case '\017': /* $^O */ |
| 1347 | case '\020': /* $^P */ |
| 1348 | case '\024': /* $^T */ |
| 1349 | case '\027': /* $^W */ |
| 1350 | magicalize: |
| 1351 | sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len); |
| 1352 | break; |
| 1353 | |
| 1354 | case '\014': /* $^L */ |
| 1355 | sv_setpvn(GvSVn(gv),"\f",1); |
| 1356 | PL_formfeed = GvSVn(gv); |
| 1357 | break; |
| 1358 | case ';': |
| 1359 | sv_setpvn(GvSVn(gv),"\034",1); |
| 1360 | break; |
| 1361 | case ']': |
| 1362 | { |
| 1363 | SV * const sv = GvSVn(gv); |
| 1364 | if (!sv_derived_from(PL_patchlevel, "version")) |
| 1365 | upg_version(PL_patchlevel, TRUE); |
| 1366 | GvSV(gv) = vnumify(PL_patchlevel); |
| 1367 | SvREADONLY_on(GvSV(gv)); |
| 1368 | SvREFCNT_dec(sv); |
| 1369 | } |
| 1370 | break; |
| 1371 | case '\026': /* $^V */ |
| 1372 | { |
| 1373 | SV * const sv = GvSVn(gv); |
| 1374 | GvSV(gv) = new_version(PL_patchlevel); |
| 1375 | SvREADONLY_on(GvSV(gv)); |
| 1376 | SvREFCNT_dec(sv); |
| 1377 | } |
| 1378 | break; |
| 1379 | } |
| 1380 | } |
| 1381 | return gv; |
| 1382 | } |
| 1383 | |
| 1384 | void |
| 1385 | Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain) |
| 1386 | { |
| 1387 | const char *name; |
| 1388 | STRLEN namelen; |
| 1389 | const HV * const hv = GvSTASH(gv); |
| 1390 | if (!hv) { |
| 1391 | SvOK_off(sv); |
| 1392 | return; |
| 1393 | } |
| 1394 | sv_setpv(sv, prefix ? prefix : ""); |
| 1395 | |
| 1396 | name = HvNAME_get(hv); |
| 1397 | if (name) { |
| 1398 | namelen = HvNAMELEN_get(hv); |
| 1399 | } else { |
| 1400 | name = "__ANON__"; |
| 1401 | namelen = 8; |
| 1402 | } |
| 1403 | |
| 1404 | if (keepmain || strNE(name, "main")) { |
| 1405 | sv_catpvn(sv,name,namelen); |
| 1406 | sv_catpvs(sv,"::"); |
| 1407 | } |
| 1408 | sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv)); |
| 1409 | } |
| 1410 | |
| 1411 | void |
| 1412 | Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain) |
| 1413 | { |
| 1414 | const GV * const egv = GvEGV(gv); |
| 1415 | gv_fullname4(sv, egv ? egv : gv, prefix, keepmain); |
| 1416 | } |
| 1417 | |
| 1418 | IO * |
| 1419 | Perl_newIO(pTHX) |
| 1420 | { |
| 1421 | dVAR; |
| 1422 | GV *iogv; |
| 1423 | IO * const io = (IO*)newSV_type(SVt_PVIO); |
| 1424 | /* This used to read SvREFCNT(io) = 1; |
| 1425 | It's not clear why the reference count needed an explicit reset. NWC |
| 1426 | */ |
| 1427 | assert (SvREFCNT(io) == 1); |
| 1428 | SvOBJECT_on(io); |
| 1429 | /* Clear the stashcache because a new IO could overrule a package name */ |
| 1430 | hv_clear(PL_stashcache); |
| 1431 | iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV); |
| 1432 | /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */ |
| 1433 | if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv)))) |
| 1434 | iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV); |
| 1435 | SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv))); |
| 1436 | return io; |
| 1437 | } |
| 1438 | |
| 1439 | void |
| 1440 | Perl_gv_check(pTHX_ const HV *stash) |
| 1441 | { |
| 1442 | dVAR; |
| 1443 | register I32 i; |
| 1444 | |
| 1445 | if (!HvARRAY(stash)) |
| 1446 | return; |
| 1447 | for (i = 0; i <= (I32) HvMAX(stash); i++) { |
| 1448 | const HE *entry; |
| 1449 | for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) { |
| 1450 | register GV *gv; |
| 1451 | HV *hv; |
| 1452 | if (HeKEY(entry)[HeKLEN(entry)-1] == ':' && |
| 1453 | (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv))) |
| 1454 | { |
| 1455 | if (hv != PL_defstash && hv != stash) |
| 1456 | gv_check(hv); /* nested package */ |
| 1457 | } |
| 1458 | else if (isALPHA(*HeKEY(entry))) { |
| 1459 | const char *file; |
| 1460 | gv = (GV*)HeVAL(entry); |
| 1461 | if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv)) |
| 1462 | continue; |
| 1463 | file = GvFILE(gv); |
| 1464 | CopLINE_set(PL_curcop, GvLINE(gv)); |
| 1465 | #ifdef USE_ITHREADS |
| 1466 | CopFILE(PL_curcop) = (char *)file; /* set for warning */ |
| 1467 | #else |
| 1468 | CopFILEGV(PL_curcop) |
| 1469 | = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0); |
| 1470 | #endif |
| 1471 | Perl_warner(aTHX_ packWARN(WARN_ONCE), |
| 1472 | "Name \"%s::%s\" used only once: possible typo", |
| 1473 | HvNAME_get(stash), GvNAME(gv)); |
| 1474 | } |
| 1475 | } |
| 1476 | } |
| 1477 | } |
| 1478 | |
| 1479 | GV * |
| 1480 | Perl_newGVgen(pTHX_ const char *pack) |
| 1481 | { |
| 1482 | dVAR; |
| 1483 | return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++), |
| 1484 | GV_ADD, SVt_PVGV); |
| 1485 | } |
| 1486 | |
| 1487 | /* hopefully this is only called on local symbol table entries */ |
| 1488 | |
| 1489 | GP* |
| 1490 | Perl_gp_ref(pTHX_ GP *gp) |
| 1491 | { |
| 1492 | dVAR; |
| 1493 | if (!gp) |
| 1494 | return NULL; |
| 1495 | gp->gp_refcnt++; |
| 1496 | if (gp->gp_cv) { |
| 1497 | if (gp->gp_cvgen) { |
| 1498 | /* If the GP they asked for a reference to contains |
| 1499 | a method cache entry, clear it first, so that we |
| 1500 | don't infect them with our cached entry */ |
| 1501 | SvREFCNT_dec(gp->gp_cv); |
| 1502 | gp->gp_cv = NULL; |
| 1503 | gp->gp_cvgen = 0; |
| 1504 | } |
| 1505 | } |
| 1506 | return gp; |
| 1507 | } |
| 1508 | |
| 1509 | void |
| 1510 | Perl_gp_free(pTHX_ GV *gv) |
| 1511 | { |
| 1512 | dVAR; |
| 1513 | GP* gp; |
| 1514 | |
| 1515 | if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv))) |
| 1516 | return; |
| 1517 | if (gp->gp_refcnt == 0) { |
| 1518 | if (ckWARN_d(WARN_INTERNAL)) |
| 1519 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
| 1520 | "Attempt to free unreferenced glob pointers" |
| 1521 | pTHX__FORMAT pTHX__VALUE); |
| 1522 | return; |
| 1523 | } |
| 1524 | if (--gp->gp_refcnt > 0) { |
| 1525 | if (gp->gp_egv == gv) |
| 1526 | gp->gp_egv = 0; |
| 1527 | GvGP(gv) = 0; |
| 1528 | return; |
| 1529 | } |
| 1530 | |
| 1531 | if (gp->gp_file_hek) |
| 1532 | unshare_hek(gp->gp_file_hek); |
| 1533 | SvREFCNT_dec(gp->gp_sv); |
| 1534 | SvREFCNT_dec(gp->gp_av); |
| 1535 | /* FIXME - another reference loop GV -> symtab -> GV ? |
| 1536 | Somehow gp->gp_hv can end up pointing at freed garbage. */ |
| 1537 | if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) { |
| 1538 | const char *hvname = HvNAME_get(gp->gp_hv); |
| 1539 | if (PL_stashcache && hvname) |
| 1540 | (void)hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv), |
| 1541 | G_DISCARD); |
| 1542 | SvREFCNT_dec(gp->gp_hv); |
| 1543 | } |
| 1544 | SvREFCNT_dec(gp->gp_io); |
| 1545 | SvREFCNT_dec(gp->gp_cv); |
| 1546 | SvREFCNT_dec(gp->gp_form); |
| 1547 | |
| 1548 | Safefree(gp); |
| 1549 | GvGP(gv) = 0; |
| 1550 | } |
| 1551 | |
| 1552 | int |
| 1553 | Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg) |
| 1554 | { |
| 1555 | AMT * const amtp = (AMT*)mg->mg_ptr; |
| 1556 | PERL_UNUSED_ARG(sv); |
| 1557 | |
| 1558 | if (amtp && AMT_AMAGIC(amtp)) { |
| 1559 | int i; |
| 1560 | for (i = 1; i < NofAMmeth; i++) { |
| 1561 | CV * const cv = amtp->table[i]; |
| 1562 | if (cv) { |
| 1563 | SvREFCNT_dec((SV *) cv); |
| 1564 | amtp->table[i] = NULL; |
| 1565 | } |
| 1566 | } |
| 1567 | } |
| 1568 | return 0; |
| 1569 | } |
| 1570 | |
| 1571 | /* Updates and caches the CV's */ |
| 1572 | |
| 1573 | bool |
| 1574 | Perl_Gv_AMupdate(pTHX_ HV *stash) |
| 1575 | { |
| 1576 | dVAR; |
| 1577 | MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table); |
| 1578 | AMT amt; |
| 1579 | const struct mro_meta* stash_meta = HvMROMETA(stash); |
| 1580 | U32 newgen; |
| 1581 | |
| 1582 | newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen; |
| 1583 | if (mg) { |
| 1584 | const AMT * const amtp = (AMT*)mg->mg_ptr; |
| 1585 | if (amtp->was_ok_am == PL_amagic_generation |
| 1586 | && amtp->was_ok_sub == newgen) { |
| 1587 | return (bool)AMT_OVERLOADED(amtp); |
| 1588 | } |
| 1589 | sv_unmagic((SV*)stash, PERL_MAGIC_overload_table); |
| 1590 | } |
| 1591 | |
| 1592 | DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) ); |
| 1593 | |
| 1594 | Zero(&amt,1,AMT); |
| 1595 | amt.was_ok_am = PL_amagic_generation; |
| 1596 | amt.was_ok_sub = newgen; |
| 1597 | amt.fallback = AMGfallNO; |
| 1598 | amt.flags = 0; |
| 1599 | |
| 1600 | { |
| 1601 | int filled = 0, have_ovl = 0; |
| 1602 | int i, lim = 1; |
| 1603 | |
| 1604 | /* Work with "fallback" key, which we assume to be first in PL_AMG_names */ |
| 1605 | |
| 1606 | /* Try to find via inheritance. */ |
| 1607 | GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1); |
| 1608 | SV * const sv = gv ? GvSV(gv) : NULL; |
| 1609 | CV* cv; |
| 1610 | |
| 1611 | if (!gv) |
| 1612 | lim = DESTROY_amg; /* Skip overloading entries. */ |
| 1613 | #ifdef PERL_DONT_CREATE_GVSV |
| 1614 | else if (!sv) { |
| 1615 | NOOP; /* Equivalent to !SvTRUE and !SvOK */ |
| 1616 | } |
| 1617 | #endif |
| 1618 | else if (SvTRUE(sv)) |
| 1619 | amt.fallback=AMGfallYES; |
| 1620 | else if (SvOK(sv)) |
| 1621 | amt.fallback=AMGfallNEVER; |
| 1622 | |
| 1623 | for (i = 1; i < lim; i++) |
| 1624 | amt.table[i] = NULL; |
| 1625 | for (; i < NofAMmeth; i++) { |
| 1626 | const char * const cooky = PL_AMG_names[i]; |
| 1627 | /* Human-readable form, for debugging: */ |
| 1628 | const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i)); |
| 1629 | const STRLEN l = PL_AMG_namelens[i]; |
| 1630 | |
| 1631 | DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n", |
| 1632 | cp, HvNAME_get(stash)) ); |
| 1633 | /* don't fill the cache while looking up! |
| 1634 | Creation of inheritance stubs in intermediate packages may |
| 1635 | conflict with the logic of runtime method substitution. |
| 1636 | Indeed, for inheritance A -> B -> C, if C overloads "+0", |
| 1637 | then we could have created stubs for "(+0" in A and C too. |
| 1638 | But if B overloads "bool", we may want to use it for |
| 1639 | numifying instead of C's "+0". */ |
| 1640 | if (i >= DESTROY_amg) |
| 1641 | gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0); |
| 1642 | else /* Autoload taken care of below */ |
| 1643 | gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1); |
| 1644 | cv = 0; |
| 1645 | if (gv && (cv = GvCV(gv))) { |
| 1646 | const char *hvname; |
| 1647 | if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil") |
| 1648 | && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) { |
| 1649 | /* This is a hack to support autoloading..., while |
| 1650 | knowing *which* methods were declared as overloaded. */ |
| 1651 | /* GvSV contains the name of the method. */ |
| 1652 | GV *ngv = NULL; |
| 1653 | SV *gvsv = GvSV(gv); |
| 1654 | |
| 1655 | DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\ |
| 1656 | "\" for overloaded \"%s\" in package \"%.256s\"\n", |
| 1657 | (void*)GvSV(gv), cp, hvname) ); |
| 1658 | if (!gvsv || !SvPOK(gvsv) |
| 1659 | || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv), |
| 1660 | FALSE))) |
| 1661 | { |
| 1662 | /* Can be an import stub (created by "can"). */ |
| 1663 | const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???"; |
| 1664 | Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\ |
| 1665 | "in package \"%.256s\"", |
| 1666 | (GvCVGEN(gv) ? "Stub found while resolving" |
| 1667 | : "Can't resolve"), |
| 1668 | name, cp, hvname); |
| 1669 | } |
| 1670 | cv = GvCV(gv = ngv); |
| 1671 | } |
| 1672 | DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n", |
| 1673 | cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))), |
| 1674 | GvNAME(CvGV(cv))) ); |
| 1675 | filled = 1; |
| 1676 | if (i < DESTROY_amg) |
| 1677 | have_ovl = 1; |
| 1678 | } else if (gv) { /* Autoloaded... */ |
| 1679 | cv = (CV*)gv; |
| 1680 | filled = 1; |
| 1681 | } |
| 1682 | amt.table[i]=(CV*)SvREFCNT_inc_simple(cv); |
| 1683 | } |
| 1684 | if (filled) { |
| 1685 | AMT_AMAGIC_on(&amt); |
| 1686 | if (have_ovl) |
| 1687 | AMT_OVERLOADED_on(&amt); |
| 1688 | sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table, |
| 1689 | (char*)&amt, sizeof(AMT)); |
| 1690 | return have_ovl; |
| 1691 | } |
| 1692 | } |
| 1693 | /* Here we have no table: */ |
| 1694 | /* no_table: */ |
| 1695 | AMT_AMAGIC_off(&amt); |
| 1696 | sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table, |
| 1697 | (char*)&amt, sizeof(AMTS)); |
| 1698 | return FALSE; |
| 1699 | } |
| 1700 | |
| 1701 | |
| 1702 | CV* |
| 1703 | Perl_gv_handler(pTHX_ HV *stash, I32 id) |
| 1704 | { |
| 1705 | dVAR; |
| 1706 | MAGIC *mg; |
| 1707 | AMT *amtp; |
| 1708 | U32 newgen; |
| 1709 | struct mro_meta* stash_meta; |
| 1710 | |
| 1711 | if (!stash || !HvNAME_get(stash)) |
| 1712 | return NULL; |
| 1713 | |
| 1714 | stash_meta = HvMROMETA(stash); |
| 1715 | newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen; |
| 1716 | |
| 1717 | mg = mg_find((SV*)stash, PERL_MAGIC_overload_table); |
| 1718 | if (!mg) { |
| 1719 | do_update: |
| 1720 | Gv_AMupdate(stash); |
| 1721 | mg = mg_find((SV*)stash, PERL_MAGIC_overload_table); |
| 1722 | } |
| 1723 | assert(mg); |
| 1724 | amtp = (AMT*)mg->mg_ptr; |
| 1725 | if ( amtp->was_ok_am != PL_amagic_generation |
| 1726 | || amtp->was_ok_sub != newgen ) |
| 1727 | goto do_update; |
| 1728 | if (AMT_AMAGIC(amtp)) { |
| 1729 | CV * const ret = amtp->table[id]; |
| 1730 | if (ret && isGV(ret)) { /* Autoloading stab */ |
| 1731 | /* Passing it through may have resulted in a warning |
| 1732 | "Inherited AUTOLOAD for a non-method deprecated", since |
| 1733 | our caller is going through a function call, not a method call. |
| 1734 | So return the CV for AUTOLOAD, setting $AUTOLOAD. */ |
| 1735 | GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]); |
| 1736 | |
| 1737 | if (gv && GvCV(gv)) |
| 1738 | return GvCV(gv); |
| 1739 | } |
| 1740 | return ret; |
| 1741 | } |
| 1742 | |
| 1743 | return NULL; |
| 1744 | } |
| 1745 | |
| 1746 | |
| 1747 | SV* |
| 1748 | Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags) |
| 1749 | { |
| 1750 | dVAR; |
| 1751 | MAGIC *mg; |
| 1752 | CV *cv=NULL; |
| 1753 | CV **cvp=NULL, **ocvp=NULL; |
| 1754 | AMT *amtp=NULL, *oamtp=NULL; |
| 1755 | int off = 0, off1, lr = 0, notfound = 0; |
| 1756 | int postpr = 0, force_cpy = 0; |
| 1757 | int assign = AMGf_assign & flags; |
| 1758 | const int assignshift = assign ? 1 : 0; |
| 1759 | #ifdef DEBUGGING |
| 1760 | int fl=0; |
| 1761 | #endif |
| 1762 | HV* stash=NULL; |
| 1763 | if (!(AMGf_noleft & flags) && SvAMAGIC(left) |
| 1764 | && (stash = SvSTASH(SvRV(left))) |
| 1765 | && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table)) |
| 1766 | && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) |
| 1767 | ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table |
| 1768 | : NULL)) |
| 1769 | && ((cv = cvp[off=method+assignshift]) |
| 1770 | || (assign && amtp->fallback > AMGfallNEVER && /* fallback to |
| 1771 | * usual method */ |
| 1772 | ( |
| 1773 | #ifdef DEBUGGING |
| 1774 | fl = 1, |
| 1775 | #endif |
| 1776 | cv = cvp[off=method])))) { |
| 1777 | lr = -1; /* Call method for left argument */ |
| 1778 | } else { |
| 1779 | if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) { |
| 1780 | int logic; |
| 1781 | |
| 1782 | /* look for substituted methods */ |
| 1783 | /* In all the covered cases we should be called with assign==0. */ |
| 1784 | switch (method) { |
| 1785 | case inc_amg: |
| 1786 | force_cpy = 1; |
| 1787 | if ((cv = cvp[off=add_ass_amg]) |
| 1788 | || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) { |
| 1789 | right = &PL_sv_yes; lr = -1; assign = 1; |
| 1790 | } |
| 1791 | break; |
| 1792 | case dec_amg: |
| 1793 | force_cpy = 1; |
| 1794 | if ((cv = cvp[off = subtr_ass_amg]) |
| 1795 | || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) { |
| 1796 | right = &PL_sv_yes; lr = -1; assign = 1; |
| 1797 | } |
| 1798 | break; |
| 1799 | case bool__amg: |
| 1800 | (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg])); |
| 1801 | break; |
| 1802 | case numer_amg: |
| 1803 | (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg])); |
| 1804 | break; |
| 1805 | case string_amg: |
| 1806 | (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg])); |
| 1807 | break; |
| 1808 | case not_amg: |
| 1809 | (void)((cv = cvp[off=bool__amg]) |
| 1810 | || (cv = cvp[off=numer_amg]) |
| 1811 | || (cv = cvp[off=string_amg])); |
| 1812 | postpr = 1; |
| 1813 | break; |
| 1814 | case copy_amg: |
| 1815 | { |
| 1816 | /* |
| 1817 | * SV* ref causes confusion with the interpreter variable of |
| 1818 | * the same name |
| 1819 | */ |
| 1820 | SV* const tmpRef=SvRV(left); |
| 1821 | if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) { |
| 1822 | /* |
| 1823 | * Just to be extra cautious. Maybe in some |
| 1824 | * additional cases sv_setsv is safe, too. |
| 1825 | */ |
| 1826 | SV* const newref = newSVsv(tmpRef); |
| 1827 | SvOBJECT_on(newref); |
| 1828 | /* As a bit of a source compatibility hack, SvAMAGIC() and |
| 1829 | friends dereference an RV, to behave the same was as when |
| 1830 | overloading was stored on the reference, not the referant. |
| 1831 | Hence we can't use SvAMAGIC_on() |
| 1832 | */ |
| 1833 | SvFLAGS(newref) |= SVf_AMAGIC; |
| 1834 | SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef))); |
| 1835 | return newref; |
| 1836 | } |
| 1837 | } |
| 1838 | break; |
| 1839 | case abs_amg: |
| 1840 | if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg]) |
| 1841 | && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) { |
| 1842 | SV* const nullsv=sv_2mortal(newSViv(0)); |
| 1843 | if (off1==lt_amg) { |
| 1844 | SV* const lessp = amagic_call(left,nullsv, |
| 1845 | lt_amg,AMGf_noright); |
| 1846 | logic = SvTRUE(lessp); |
| 1847 | } else { |
| 1848 | SV* const lessp = amagic_call(left,nullsv, |
| 1849 | ncmp_amg,AMGf_noright); |
| 1850 | logic = (SvNV(lessp) < 0); |
| 1851 | } |
| 1852 | if (logic) { |
| 1853 | if (off==subtr_amg) { |
| 1854 | right = left; |
| 1855 | left = nullsv; |
| 1856 | lr = 1; |
| 1857 | } |
| 1858 | } else { |
| 1859 | return left; |
| 1860 | } |
| 1861 | } |
| 1862 | break; |
| 1863 | case neg_amg: |
| 1864 | if ((cv = cvp[off=subtr_amg])) { |
| 1865 | right = left; |
| 1866 | left = sv_2mortal(newSViv(0)); |
| 1867 | lr = 1; |
| 1868 | } |
| 1869 | break; |
| 1870 | case int_amg: |
| 1871 | case iter_amg: /* XXXX Eventually should do to_gv. */ |
| 1872 | /* FAIL safe */ |
| 1873 | return NULL; /* Delegate operation to standard mechanisms. */ |
| 1874 | break; |
| 1875 | case to_sv_amg: |
| 1876 | case to_av_amg: |
| 1877 | case to_hv_amg: |
| 1878 | case to_gv_amg: |
| 1879 | case to_cv_amg: |
| 1880 | /* FAIL safe */ |
| 1881 | return left; /* Delegate operation to standard mechanisms. */ |
| 1882 | break; |
| 1883 | default: |
| 1884 | goto not_found; |
| 1885 | } |
| 1886 | if (!cv) goto not_found; |
| 1887 | } else if (!(AMGf_noright & flags) && SvAMAGIC(right) |
| 1888 | && (stash = SvSTASH(SvRV(right))) |
| 1889 | && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table)) |
| 1890 | && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) |
| 1891 | ? (amtp = (AMT*)mg->mg_ptr)->table |
| 1892 | : NULL)) |
| 1893 | && (cv = cvp[off=method])) { /* Method for right |
| 1894 | * argument found */ |
| 1895 | lr=1; |
| 1896 | } else if (((ocvp && oamtp->fallback > AMGfallNEVER |
| 1897 | && (cvp=ocvp) && (lr = -1)) |
| 1898 | || (cvp && amtp->fallback > AMGfallNEVER && (lr=1))) |
| 1899 | && !(flags & AMGf_unary)) { |
| 1900 | /* We look for substitution for |
| 1901 | * comparison operations and |
| 1902 | * concatenation */ |
| 1903 | if (method==concat_amg || method==concat_ass_amg |
| 1904 | || method==repeat_amg || method==repeat_ass_amg) { |
| 1905 | return NULL; /* Delegate operation to string conversion */ |
| 1906 | } |
| 1907 | off = -1; |
| 1908 | switch (method) { |
| 1909 | case lt_amg: |
| 1910 | case le_amg: |
| 1911 | case gt_amg: |
| 1912 | case ge_amg: |
| 1913 | case eq_amg: |
| 1914 | case ne_amg: |
| 1915 | postpr = 1; off=ncmp_amg; break; |
| 1916 | case slt_amg: |
| 1917 | case sle_amg: |
| 1918 | case sgt_amg: |
| 1919 | case sge_amg: |
| 1920 | case seq_amg: |
| 1921 | case sne_amg: |
| 1922 | postpr = 1; off=scmp_amg; break; |
| 1923 | } |
| 1924 | if (off != -1) cv = cvp[off]; |
| 1925 | if (!cv) { |
| 1926 | goto not_found; |
| 1927 | } |
| 1928 | } else { |
| 1929 | not_found: /* No method found, either report or croak */ |
| 1930 | switch (method) { |
| 1931 | case lt_amg: |
| 1932 | case le_amg: |
| 1933 | case gt_amg: |
| 1934 | case ge_amg: |
| 1935 | case eq_amg: |
| 1936 | case ne_amg: |
| 1937 | case slt_amg: |
| 1938 | case sle_amg: |
| 1939 | case sgt_amg: |
| 1940 | case sge_amg: |
| 1941 | case seq_amg: |
| 1942 | case sne_amg: |
| 1943 | postpr = 0; break; |
| 1944 | case to_sv_amg: |
| 1945 | case to_av_amg: |
| 1946 | case to_hv_amg: |
| 1947 | case to_gv_amg: |
| 1948 | case to_cv_amg: |
| 1949 | /* FAIL safe */ |
| 1950 | return left; /* Delegate operation to standard mechanisms. */ |
| 1951 | break; |
| 1952 | } |
| 1953 | if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */ |
| 1954 | notfound = 1; lr = -1; |
| 1955 | } else if (cvp && (cv=cvp[nomethod_amg])) { |
| 1956 | notfound = 1; lr = 1; |
| 1957 | } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) { |
| 1958 | /* Skip generating the "no method found" message. */ |
| 1959 | return NULL; |
| 1960 | } else { |
| 1961 | SV *msg; |
| 1962 | if (off==-1) off=method; |
| 1963 | msg = sv_2mortal(Perl_newSVpvf(aTHX_ |
| 1964 | "Operation \"%s\": no method found,%sargument %s%s%s%s", |
| 1965 | AMG_id2name(method + assignshift), |
| 1966 | (flags & AMGf_unary ? " " : "\n\tleft "), |
| 1967 | SvAMAGIC(left)? |
| 1968 | "in overloaded package ": |
| 1969 | "has no overloaded magic", |
| 1970 | SvAMAGIC(left)? |
| 1971 | HvNAME_get(SvSTASH(SvRV(left))): |
| 1972 | "", |
| 1973 | SvAMAGIC(right)? |
| 1974 | ",\n\tright argument in overloaded package ": |
| 1975 | (flags & AMGf_unary |
| 1976 | ? "" |
| 1977 | : ",\n\tright argument has no overloaded magic"), |
| 1978 | SvAMAGIC(right)? |
| 1979 | HvNAME_get(SvSTASH(SvRV(right))): |
| 1980 | "")); |
| 1981 | if (amtp && amtp->fallback >= AMGfallYES) { |
| 1982 | DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) ); |
| 1983 | } else { |
| 1984 | Perl_croak(aTHX_ "%"SVf, SVfARG(msg)); |
| 1985 | } |
| 1986 | return NULL; |
| 1987 | } |
| 1988 | force_cpy = force_cpy || assign; |
| 1989 | } |
| 1990 | } |
| 1991 | #ifdef DEBUGGING |
| 1992 | if (!notfound) { |
| 1993 | DEBUG_o(Perl_deb(aTHX_ |
| 1994 | "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n", |
| 1995 | AMG_id2name(off), |
| 1996 | method+assignshift==off? "" : |
| 1997 | " (initially \"", |
| 1998 | method+assignshift==off? "" : |
| 1999 | AMG_id2name(method+assignshift), |
| 2000 | method+assignshift==off? "" : "\")", |
| 2001 | flags & AMGf_unary? "" : |
| 2002 | lr==1 ? " for right argument": " for left argument", |
| 2003 | flags & AMGf_unary? " for argument" : "", |
| 2004 | stash ? HvNAME_get(stash) : "null", |
| 2005 | fl? ",\n\tassignment variant used": "") ); |
| 2006 | } |
| 2007 | #endif |
| 2008 | /* Since we use shallow copy during assignment, we need |
| 2009 | * to dublicate the contents, probably calling user-supplied |
| 2010 | * version of copy operator |
| 2011 | */ |
| 2012 | /* We need to copy in following cases: |
| 2013 | * a) Assignment form was called. |
| 2014 | * assignshift==1, assign==T, method + 1 == off |
| 2015 | * b) Increment or decrement, called directly. |
| 2016 | * assignshift==0, assign==0, method + 0 == off |
| 2017 | * c) Increment or decrement, translated to assignment add/subtr. |
| 2018 | * assignshift==0, assign==T, |
| 2019 | * force_cpy == T |
| 2020 | * d) Increment or decrement, translated to nomethod. |
| 2021 | * assignshift==0, assign==0, |
| 2022 | * force_cpy == T |
| 2023 | * e) Assignment form translated to nomethod. |
| 2024 | * assignshift==1, assign==T, method + 1 != off |
| 2025 | * force_cpy == T |
| 2026 | */ |
| 2027 | /* off is method, method+assignshift, or a result of opcode substitution. |
| 2028 | * In the latter case assignshift==0, so only notfound case is important. |
| 2029 | */ |
| 2030 | if (( (method + assignshift == off) |
| 2031 | && (assign || (method == inc_amg) || (method == dec_amg))) |
| 2032 | || force_cpy) |
| 2033 | RvDEEPCP(left); |
| 2034 | { |
| 2035 | dSP; |
| 2036 | BINOP myop; |
| 2037 | SV* res; |
| 2038 | const bool oldcatch = CATCH_GET; |
| 2039 | |
| 2040 | CATCH_SET(TRUE); |
| 2041 | Zero(&myop, 1, BINOP); |
| 2042 | myop.op_last = (OP *) &myop; |
| 2043 | myop.op_next = NULL; |
| 2044 | myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED; |
| 2045 | |
| 2046 | PUSHSTACKi(PERLSI_OVERLOAD); |
| 2047 | ENTER; |
| 2048 | SAVEOP(); |
| 2049 | PL_op = (OP *) &myop; |
| 2050 | if (PERLDB_SUB && PL_curstash != PL_debstash) |
| 2051 | PL_op->op_private |= OPpENTERSUB_DB; |
| 2052 | PUTBACK; |
| 2053 | pp_pushmark(); |
| 2054 | |
| 2055 | EXTEND(SP, notfound + 5); |
| 2056 | PUSHs(lr>0? right: left); |
| 2057 | PUSHs(lr>0? left: right); |
| 2058 | PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no )); |
| 2059 | if (notfound) { |
| 2060 | PUSHs( sv_2mortal(newSVpvn(AMG_id2name(method + assignshift), |
| 2061 | AMG_id2namelen(method + assignshift)))); |
| 2062 | } |
| 2063 | PUSHs((SV*)cv); |
| 2064 | PUTBACK; |
| 2065 | |
| 2066 | if ((PL_op = Perl_pp_entersub(aTHX))) |
| 2067 | CALLRUNOPS(aTHX); |
| 2068 | LEAVE; |
| 2069 | SPAGAIN; |
| 2070 | |
| 2071 | res=POPs; |
| 2072 | PUTBACK; |
| 2073 | POPSTACK; |
| 2074 | CATCH_SET(oldcatch); |
| 2075 | |
| 2076 | if (postpr) { |
| 2077 | int ans; |
| 2078 | switch (method) { |
| 2079 | case le_amg: |
| 2080 | case sle_amg: |
| 2081 | ans=SvIV(res)<=0; break; |
| 2082 | case lt_amg: |
| 2083 | case slt_amg: |
| 2084 | ans=SvIV(res)<0; break; |
| 2085 | case ge_amg: |
| 2086 | case sge_amg: |
| 2087 | ans=SvIV(res)>=0; break; |
| 2088 | case gt_amg: |
| 2089 | case sgt_amg: |
| 2090 | ans=SvIV(res)>0; break; |
| 2091 | case eq_amg: |
| 2092 | case seq_amg: |
| 2093 | ans=SvIV(res)==0; break; |
| 2094 | case ne_amg: |
| 2095 | case sne_amg: |
| 2096 | ans=SvIV(res)!=0; break; |
| 2097 | case inc_amg: |
| 2098 | case dec_amg: |
| 2099 | SvSetSV(left,res); return left; |
| 2100 | case not_amg: |
| 2101 | ans=!SvTRUE(res); break; |
| 2102 | default: |
| 2103 | ans=0; break; |
| 2104 | } |
| 2105 | return boolSV(ans); |
| 2106 | } else if (method==copy_amg) { |
| 2107 | if (!SvROK(res)) { |
| 2108 | Perl_croak(aTHX_ "Copy method did not return a reference"); |
| 2109 | } |
| 2110 | return SvREFCNT_inc(SvRV(res)); |
| 2111 | } else { |
| 2112 | return res; |
| 2113 | } |
| 2114 | } |
| 2115 | } |
| 2116 | |
| 2117 | /* |
| 2118 | =for apidoc is_gv_magical_sv |
| 2119 | |
| 2120 | Returns C<TRUE> if given the name of a magical GV. Calls is_gv_magical. |
| 2121 | |
| 2122 | =cut |
| 2123 | */ |
| 2124 | |
| 2125 | bool |
| 2126 | Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags) |
| 2127 | { |
| 2128 | STRLEN len; |
| 2129 | const char * const temp = SvPV_const(name, len); |
| 2130 | return is_gv_magical(temp, len, flags); |
| 2131 | } |
| 2132 | |
| 2133 | /* |
| 2134 | =for apidoc is_gv_magical |
| 2135 | |
| 2136 | Returns C<TRUE> if given the name of a magical GV. |
| 2137 | |
| 2138 | Currently only useful internally when determining if a GV should be |
| 2139 | created even in rvalue contexts. |
| 2140 | |
| 2141 | C<flags> is not used at present but available for future extension to |
| 2142 | allow selecting particular classes of magical variable. |
| 2143 | |
| 2144 | Currently assumes that C<name> is NUL terminated (as well as len being valid). |
| 2145 | This assumption is met by all callers within the perl core, which all pass |
| 2146 | pointers returned by SvPV. |
| 2147 | |
| 2148 | =cut |
| 2149 | */ |
| 2150 | bool |
| 2151 | Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags) |
| 2152 | { |
| 2153 | PERL_UNUSED_CONTEXT; |
| 2154 | PERL_UNUSED_ARG(flags); |
| 2155 | |
| 2156 | if (len > 1) { |
| 2157 | const char * const name1 = name + 1; |
| 2158 | switch (*name) { |
| 2159 | case 'I': |
| 2160 | if (len == 3 && name1[1] == 'S' && name[2] == 'A') |
| 2161 | goto yes; |
| 2162 | break; |
| 2163 | case 'O': |
| 2164 | if (len == 8 && strEQ(name1, "VERLOAD")) |
| 2165 | goto yes; |
| 2166 | break; |
| 2167 | case 'S': |
| 2168 | if (len == 3 && name[1] == 'I' && name[2] == 'G') |
| 2169 | goto yes; |
| 2170 | break; |
| 2171 | /* Using ${^...} variables is likely to be sufficiently rare that |
| 2172 | it seems sensible to avoid the space hit of also checking the |
| 2173 | length. */ |
| 2174 | case '\017': /* ${^OPEN} */ |
| 2175 | if (strEQ(name1, "PEN")) |
| 2176 | goto yes; |
| 2177 | break; |
| 2178 | case '\024': /* ${^TAINT} */ |
| 2179 | if (strEQ(name1, "AINT")) |
| 2180 | goto yes; |
| 2181 | break; |
| 2182 | case '\025': /* ${^UNICODE} */ |
| 2183 | if (strEQ(name1, "NICODE")) |
| 2184 | goto yes; |
| 2185 | if (strEQ(name1, "TF8LOCALE")) |
| 2186 | goto yes; |
| 2187 | break; |
| 2188 | case '\027': /* ${^WARNING_BITS} */ |
| 2189 | if (strEQ(name1, "ARNING_BITS")) |
| 2190 | goto yes; |
| 2191 | break; |
| 2192 | case '1': |
| 2193 | case '2': |
| 2194 | case '3': |
| 2195 | case '4': |
| 2196 | case '5': |
| 2197 | case '6': |
| 2198 | case '7': |
| 2199 | case '8': |
| 2200 | case '9': |
| 2201 | { |
| 2202 | const char *end = name + len; |
| 2203 | while (--end > name) { |
| 2204 | if (!isDIGIT(*end)) |
| 2205 | return FALSE; |
| 2206 | } |
| 2207 | goto yes; |
| 2208 | } |
| 2209 | } |
| 2210 | } else { |
| 2211 | /* Because we're already assuming that name is NUL terminated |
| 2212 | below, we can treat an empty name as "\0" */ |
| 2213 | switch (*name) { |
| 2214 | case '&': |
| 2215 | case '`': |
| 2216 | case '\'': |
| 2217 | case ':': |
| 2218 | case '?': |
| 2219 | case '!': |
| 2220 | case '-': |
| 2221 | case '#': |
| 2222 | case '[': |
| 2223 | case '^': |
| 2224 | case '~': |
| 2225 | case '=': |
| 2226 | case '%': |
| 2227 | case '.': |
| 2228 | case '(': |
| 2229 | case ')': |
| 2230 | case '<': |
| 2231 | case '>': |
| 2232 | case ',': |
| 2233 | case '\\': |
| 2234 | case '/': |
| 2235 | case '|': |
| 2236 | case '+': |
| 2237 | case ';': |
| 2238 | case ']': |
| 2239 | case '\001': /* $^A */ |
| 2240 | case '\003': /* $^C */ |
| 2241 | case '\004': /* $^D */ |
| 2242 | case '\005': /* $^E */ |
| 2243 | case '\006': /* $^F */ |
| 2244 | case '\010': /* $^H */ |
| 2245 | case '\011': /* $^I, NOT \t in EBCDIC */ |
| 2246 | case '\014': /* $^L */ |
| 2247 | case '\016': /* $^N */ |
| 2248 | case '\017': /* $^O */ |
| 2249 | case '\020': /* $^P */ |
| 2250 | case '\023': /* $^S */ |
| 2251 | case '\024': /* $^T */ |
| 2252 | case '\026': /* $^V */ |
| 2253 | case '\027': /* $^W */ |
| 2254 | case '1': |
| 2255 | case '2': |
| 2256 | case '3': |
| 2257 | case '4': |
| 2258 | case '5': |
| 2259 | case '6': |
| 2260 | case '7': |
| 2261 | case '8': |
| 2262 | case '9': |
| 2263 | yes: |
| 2264 | return TRUE; |
| 2265 | default: |
| 2266 | break; |
| 2267 | } |
| 2268 | } |
| 2269 | return FALSE; |
| 2270 | } |
| 2271 | |
| 2272 | void |
| 2273 | Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags) |
| 2274 | { |
| 2275 | dVAR; |
| 2276 | U32 hash; |
| 2277 | |
| 2278 | assert(name); |
| 2279 | PERL_UNUSED_ARG(flags); |
| 2280 | |
| 2281 | if (len > I32_MAX) |
| 2282 | Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len); |
| 2283 | |
| 2284 | if (!(flags & GV_ADD) && GvNAME_HEK(gv)) { |
| 2285 | unshare_hek(GvNAME_HEK(gv)); |
| 2286 | } |
| 2287 | |
| 2288 | PERL_HASH(hash, name, len); |
| 2289 | GvNAME_HEK(gv) = share_hek(name, len, hash); |
| 2290 | } |
| 2291 | |
| 2292 | /* |
| 2293 | * Local variables: |
| 2294 | * c-indentation-style: bsd |
| 2295 | * c-basic-offset: 4 |
| 2296 | * indent-tabs-mode: t |
| 2297 | * End: |
| 2298 | * |
| 2299 | * ex: set ts=8 sts=4 sw=4 noet: |
| 2300 | */ |