1 /* gv.c 2 * 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 in 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 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"] 20 */ 21 22 /* 23 =head1 GV Functions 24 A GV is a structure which corresponds to to a Perl typeglob, ie *foo. 25 It is a structure that holds a pointer to a scalar, an array, a hash etc, 26 corresponding to $foo, @foo, %foo. 27 28 GVs are usually found as values in stashes (symbol table hashes) where 29 Perl stores its global variables. 30 31 =cut 32 */ 33 34 #include "EXTERN.h" 35 #define PERL_IN_GV_C 36 #include "perl.h" 37 #include "overload.inc" 38 #include "keywords.h" 39 #include "feature.h" 40 41 static const char S_autoload[] = "AUTOLOAD"; 42 #define S_autolen (sizeof("AUTOLOAD")-1) 43 44 GV * 45 Perl_gv_add_by_type(pTHX_ GV *gv, svtype type) 46 { 47 SV **where; 48 49 if ( 50 !gv 51 || ( 52 SvTYPE((const SV *)gv) != SVt_PVGV 53 && SvTYPE((const SV *)gv) != SVt_PVLV 54 ) 55 ) { 56 const char *what; 57 if (type == SVt_PVIO) { 58 /* 59 * if it walks like a dirhandle, then let's assume that 60 * this is a dirhandle. 61 */ 62 what = OP_IS_DIRHOP(PL_op->op_type) ? 63 "dirhandle" : "filehandle"; 64 } else if (type == SVt_PVHV) { 65 what = "hash"; 66 } else { 67 what = type == SVt_PVAV ? "array" : "scalar"; 68 } 69 /* diag_listed_as: Bad symbol for filehandle */ 70 Perl_croak(aTHX_ "Bad symbol for %s", what); 71 } 72 73 if (type == SVt_PVHV) { 74 where = (SV **)&GvHV(gv); 75 } else if (type == SVt_PVAV) { 76 where = (SV **)&GvAV(gv); 77 } else if (type == SVt_PVIO) { 78 where = (SV **)&GvIOp(gv); 79 } else { 80 where = &GvSV(gv); 81 } 82 83 if (!*where) 84 { 85 *where = newSV_type(type); 86 if (type == SVt_PVAV 87 && memEQs(GvNAME(gv), GvNAMELEN(gv), "ISA")) 88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0); 89 } 90 return gv; 91 } 92 93 GV * 94 Perl_gv_fetchfile(pTHX_ const char *name) 95 { 96 PERL_ARGS_ASSERT_GV_FETCHFILE; 97 return gv_fetchfile_flags(name, strlen(name), 0); 98 } 99 100 GV * 101 Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen, 102 const U32 flags) 103 { 104 char smallbuf[128]; 105 char *tmpbuf; 106 const STRLEN tmplen = namelen + 2; 107 GV *gv; 108 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS; 110 PERL_UNUSED_ARG(flags); 111 112 if (!PL_defstash) 113 return NULL; 114 115 if (tmplen <= sizeof smallbuf) 116 tmpbuf = smallbuf; 117 else 118 Newx(tmpbuf, tmplen, char); 119 /* This is where the debugger's %{"::_<$filename"} hash is created */ 120 tmpbuf[0] = '_'; 121 tmpbuf[1] = '<'; 122 memcpy(tmpbuf + 2, name, namelen); 123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE); 124 if (!isGV(gv)) { 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE); 126 #ifdef PERL_DONT_CREATE_GVSV 127 GvSV(gv) = newSVpvn(name, namelen); 128 #else 129 sv_setpvn(GvSV(gv), name, namelen); 130 #endif 131 } 132 if (PERLDB_LINE_OR_SAVESRC && !GvAV(gv)) 133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile); 134 if (tmpbuf != smallbuf) 135 Safefree(tmpbuf); 136 return gv; 137 } 138 139 /* 140 =for apidoc gv_const_sv 141 142 If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for 143 inlining, or C<gv> is a placeholder reference that would be promoted to such 144 a typeglob, then returns the value returned by the sub. Otherwise, returns 145 C<NULL>. 146 147 =cut 148 */ 149 150 SV * 151 Perl_gv_const_sv(pTHX_ GV *gv) 152 { 153 PERL_ARGS_ASSERT_GV_CONST_SV; 154 PERL_UNUSED_CONTEXT; 155 156 if (SvTYPE(gv) == SVt_PVGV) 157 return cv_const_sv(GvCVu(gv)); 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV && SvTYPE(SvRV(gv)) != SVt_PVCV ? SvRV(gv) : NULL; 159 } 160 161 GP * 162 Perl_newGP(pTHX_ GV *const gv) 163 { 164 GP *gp; 165 U32 hash; 166 const char *file; 167 STRLEN len; 168 #ifndef USE_ITHREADS 169 GV *filegv; 170 #endif 171 dVAR; 172 173 PERL_ARGS_ASSERT_NEWGP; 174 Newxz(gp, 1, GP); 175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */ 176 #ifndef PERL_DONT_CREATE_GVSV 177 gp->gp_sv = newSV(0); 178 #endif 179 180 /* PL_curcop may be null here. E.g., 181 INIT { bless {} and exit } 182 frees INIT before looking up DESTROY (and creating *DESTROY) 183 */ 184 if (PL_curcop) { 185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */ 186 #ifdef USE_ITHREADS 187 if (CopFILE(PL_curcop)) { 188 file = CopFILE(PL_curcop); 189 len = strlen(file); 190 } 191 #else 192 filegv = CopFILEGV(PL_curcop); 193 if (filegv) { 194 file = GvNAME(filegv)+2; 195 len = GvNAMELEN(filegv)-2; 196 } 197 #endif 198 else goto no_file; 199 } 200 else { 201 no_file: 202 file = ""; 203 len = 0; 204 } 205 206 PERL_HASH(hash, file, len); 207 gp->gp_file_hek = share_hek(file, len, hash); 208 gp->gp_refcnt = 1; 209 210 return gp; 211 } 212 213 /* Assign CvGV(cv) = gv, handling weak references. 214 * See also S_anonymise_cv_maybe */ 215 216 void 217 Perl_cvgv_set(pTHX_ CV* cv, GV* gv) 218 { 219 GV * const oldgv = CvNAMED(cv) ? NULL : SvANY(cv)->xcv_gv_u.xcv_gv; 220 HEK *hek; 221 PERL_ARGS_ASSERT_CVGV_SET; 222 223 if (oldgv == gv) 224 return; 225 226 if (oldgv) { 227 if (CvCVGV_RC(cv)) { 228 SvREFCNT_dec_NN(oldgv); 229 CvCVGV_RC_off(cv); 230 } 231 else { 232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv)); 233 } 234 } 235 else if ((hek = CvNAME_HEK(cv))) { 236 unshare_hek(hek); 237 CvLEXICAL_off(cv); 238 } 239 240 CvNAMED_off(cv); 241 SvANY(cv)->xcv_gv_u.xcv_gv = gv; 242 assert(!CvCVGV_RC(cv)); 243 244 if (!gv) 245 return; 246 247 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv)) 248 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv)); 249 else { 250 CvCVGV_RC_on(cv); 251 SvREFCNT_inc_simple_void_NN(gv); 252 } 253 } 254 255 /* Convert CvSTASH + CvNAME_HEK into a GV. Conceptually, all subs have a 256 GV, but for efficiency that GV may not in fact exist. This function, 257 called by CvGV, reifies it. */ 258 259 GV * 260 Perl_cvgv_from_hek(pTHX_ CV *cv) 261 { 262 GV *gv; 263 SV **svp; 264 PERL_ARGS_ASSERT_CVGV_FROM_HEK; 265 assert(SvTYPE(cv) == SVt_PVCV); 266 if (!CvSTASH(cv)) return NULL; 267 ASSUME(CvNAME_HEK(cv)); 268 svp = hv_fetchhek(CvSTASH(cv), CvNAME_HEK(cv), 0); 269 gv = MUTABLE_GV(svp && *svp ? *svp : newSV(0)); 270 if (!isGV(gv)) 271 gv_init_pvn(gv, CvSTASH(cv), HEK_KEY(CvNAME_HEK(cv)), 272 HEK_LEN(CvNAME_HEK(cv)), 273 SVf_UTF8 * !!HEK_UTF8(CvNAME_HEK(cv))); 274 if (!CvNAMED(cv)) { /* gv_init took care of it */ 275 assert (SvANY(cv)->xcv_gv_u.xcv_gv == gv); 276 return gv; 277 } 278 unshare_hek(CvNAME_HEK(cv)); 279 CvNAMED_off(cv); 280 SvANY(cv)->xcv_gv_u.xcv_gv = gv; 281 if (svp && *svp) SvREFCNT_inc_simple_void_NN(gv); 282 CvCVGV_RC_on(cv); 283 return gv; 284 } 285 286 /* Assign CvSTASH(cv) = st, handling weak references. */ 287 288 void 289 Perl_cvstash_set(pTHX_ CV *cv, HV *st) 290 { 291 HV *oldst = CvSTASH(cv); 292 PERL_ARGS_ASSERT_CVSTASH_SET; 293 if (oldst == st) 294 return; 295 if (oldst) 296 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv)); 297 SvANY(cv)->xcv_stash = st; 298 if (st) 299 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv)); 300 } 301 302 /* 303 =for apidoc gv_init_pvn 304 305 Converts a scalar into a typeglob. This is an incoercible typeglob; 306 assigning a reference to it will assign to one of its slots, instead of 307 overwriting it as happens with typeglobs created by C<SvSetSV>. Converting 308 any scalar that is C<SvOK()> may produce unpredictable results and is reserved 309 for perl's internal use. 310 311 C<gv> is the scalar to be converted. 312 313 C<stash> is the parent stash/package, if any. 314 315 C<name> and C<len> give the name. The name must be unqualified; 316 that is, it must not include the package name. If C<gv> is a 317 stash element, it is the caller's responsibility to ensure that the name 318 passed to this function matches the name of the element. If it does not 319 match, perl's internal bookkeeping will get out of sync. 320 321 C<flags> can be set to C<SVf_UTF8> if C<name> is a UTF-8 string, or 322 the return value of SvUTF8(sv). It can also take the 323 C<GV_ADDMULTI> flag, which means to pretend that the GV has been 324 seen before (i.e., suppress "Used once" warnings). 325 326 =for apidoc gv_init 327 328 The old form of C<gv_init_pvn()>. It does not work with UTF-8 strings, as it 329 has no flags parameter. If the C<multi> parameter is set, the 330 C<GV_ADDMULTI> flag will be passed to C<gv_init_pvn()>. 331 332 =for apidoc gv_init_pv 333 334 Same as C<gv_init_pvn()>, but takes a nul-terminated string for the name 335 instead of separate char * and length parameters. 336 337 =for apidoc gv_init_sv 338 339 Same as C<gv_init_pvn()>, but takes an SV * for the name instead of separate 340 char * and length parameters. C<flags> is currently unused. 341 342 =cut 343 */ 344 345 void 346 Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags) 347 { 348 char *namepv; 349 STRLEN namelen; 350 PERL_ARGS_ASSERT_GV_INIT_SV; 351 namepv = SvPV(namesv, namelen); 352 if (SvUTF8(namesv)) 353 flags |= SVf_UTF8; 354 gv_init_pvn(gv, stash, namepv, namelen, flags); 355 } 356 357 void 358 Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags) 359 { 360 PERL_ARGS_ASSERT_GV_INIT_PV; 361 gv_init_pvn(gv, stash, name, strlen(name), flags); 362 } 363 364 void 365 Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags) 366 { 367 const U32 old_type = SvTYPE(gv); 368 const bool doproto = old_type > SVt_NULL; 369 char * const proto = (doproto && SvPOK(gv)) 370 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv)) 371 : NULL; 372 const STRLEN protolen = proto ? SvCUR(gv) : 0; 373 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0; 374 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL; 375 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0; 376 const bool really_sub = 377 has_constant && SvTYPE(has_constant) == SVt_PVCV; 378 COP * const old = PL_curcop; 379 380 PERL_ARGS_ASSERT_GV_INIT_PVN; 381 assert (!(proto && has_constant)); 382 383 if (has_constant) { 384 /* The constant has to be a scalar, array or subroutine. */ 385 switch (SvTYPE(has_constant)) { 386 case SVt_PVHV: 387 case SVt_PVFM: 388 case SVt_PVIO: 389 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob", 390 sv_reftype(has_constant, 0)); 391 NOT_REACHED; /* NOTREACHED */ 392 break; 393 394 default: NOOP; 395 } 396 SvRV_set(gv, NULL); 397 SvROK_off(gv); 398 } 399 400 401 if (old_type < SVt_PVGV) { 402 if (old_type >= SVt_PV) 403 SvCUR_set(gv, 0); 404 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV); 405 } 406 if (SvLEN(gv)) { 407 if (proto) { 408 SvPV_set(gv, NULL); 409 SvLEN_set(gv, 0); 410 SvPOK_off(gv); 411 } else 412 Safefree(SvPVX_mutable(gv)); 413 } 414 SvIOK_off(gv); 415 isGV_with_GP_on(gv); 416 417 if (really_sub && !CvISXSUB(has_constant) && CvSTART(has_constant) 418 && ( CvSTART(has_constant)->op_type == OP_NEXTSTATE 419 || CvSTART(has_constant)->op_type == OP_DBSTATE)) 420 PL_curcop = (COP *)CvSTART(has_constant); 421 GvGP_set(gv, Perl_newGP(aTHX_ gv)); 422 PL_curcop = old; 423 GvSTASH(gv) = stash; 424 if (stash) 425 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv)); 426 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 )); 427 if (flags & GV_ADDMULTI || doproto) /* doproto means it */ 428 GvMULTI_on(gv); /* _was_ mentioned */ 429 if (really_sub) { 430 /* Not actually a constant. Just a regular sub. */ 431 CV * const cv = (CV *)has_constant; 432 GvCV_set(gv,cv); 433 if (CvNAMED(cv) && CvSTASH(cv) == stash && ( 434 CvNAME_HEK(cv) == GvNAME_HEK(gv) 435 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv)) 436 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv)) 437 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv)) 438 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv)) 439 ) 440 )) 441 CvGV_set(cv,gv); 442 } 443 else if (doproto) { 444 CV *cv; 445 if (has_constant) { 446 /* newCONSTSUB takes ownership of the reference from us. */ 447 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant); 448 /* In case op.c:S_process_special_blocks stole it: */ 449 if (!GvCV(gv)) 450 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv)); 451 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */ 452 /* If this reference was a copy of another, then the subroutine 453 must have been "imported", by a Perl space assignment to a GV 454 from a reference to CV. */ 455 if (exported_constant) 456 GvIMPORTED_CV_on(gv); 457 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */ 458 } else { 459 cv = newSTUB(gv,1); 460 } 461 if (proto) { 462 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen, 463 SV_HAS_TRAILING_NUL); 464 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv)); 465 } 466 } 467 } 468 469 STATIC void 470 S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type) 471 { 472 PERL_ARGS_ASSERT_GV_INIT_SVTYPE; 473 474 switch (sv_type) { 475 case SVt_PVIO: 476 (void)GvIOn(gv); 477 break; 478 case SVt_PVAV: 479 (void)GvAVn(gv); 480 break; 481 case SVt_PVHV: 482 (void)GvHVn(gv); 483 break; 484 #ifdef PERL_DONT_CREATE_GVSV 485 case SVt_NULL: 486 case SVt_PVCV: 487 case SVt_PVFM: 488 case SVt_PVGV: 489 break; 490 default: 491 if(GvSVn(gv)) { 492 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13 493 If we just cast GvSVn(gv) to void, it ignores evaluating it for 494 its side effect */ 495 } 496 #endif 497 } 498 } 499 500 static void core_xsub(pTHX_ CV* cv); 501 502 static GV * 503 S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv, 504 const char * const name, const STRLEN len) 505 { 506 const int code = keyword(name, len, 1); 507 static const char file[] = __FILE__; 508 CV *cv, *oldcompcv = NULL; 509 int opnum = 0; 510 bool ampable = TRUE; /* &{}-able */ 511 COP *oldcurcop = NULL; 512 yy_parser *oldparser = NULL; 513 I32 oldsavestack_ix = 0; 514 515 assert(gv || stash); 516 assert(name); 517 518 if (!code) return NULL; /* Not a keyword */ 519 switch (code < 0 ? -code : code) { 520 /* no support for \&CORE::infix; 521 no support for funcs that do not parse like funcs */ 522 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD: 523 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp: 524 case KEY_default : case KEY_DESTROY: 525 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif : 526 case KEY_END : case KEY_eq : case KEY_eval : 527 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge : 528 case KEY_given : case KEY_goto : case KEY_grep : 529 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le: 530 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my: 531 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our: 532 case KEY_package: case KEY_print: case KEY_printf: 533 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw : 534 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return: 535 case KEY_s : case KEY_say : case KEY_sort : 536 case KEY_state: case KEY_sub : 537 case KEY_tr : case KEY_UNITCHECK: case KEY_unless: 538 case KEY_until: case KEY_use : case KEY_when : case KEY_while : 539 case KEY_x : case KEY_xor : case KEY_y : 540 return NULL; 541 case KEY_chdir: 542 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete: 543 case KEY_eof : case KEY_exec: case KEY_exists : 544 case KEY_lstat: 545 case KEY_split: 546 case KEY_stat: 547 case KEY_system: 548 case KEY_truncate: case KEY_unlink: 549 ampable = FALSE; 550 } 551 if (!gv) { 552 gv = (GV *)newSV(0); 553 gv_init(gv, stash, name, len, TRUE); 554 } 555 GvMULTI_on(gv); 556 if (ampable) { 557 ENTER; 558 oldcurcop = PL_curcop; 559 oldparser = PL_parser; 560 lex_start(NULL, NULL, 0); 561 oldcompcv = PL_compcv; 562 PL_compcv = NULL; /* Prevent start_subparse from setting 563 CvOUTSIDE. */ 564 oldsavestack_ix = start_subparse(FALSE,0); 565 cv = PL_compcv; 566 } 567 else { 568 /* Avoid calling newXS, as it calls us, and things start to 569 get hairy. */ 570 cv = MUTABLE_CV(newSV_type(SVt_PVCV)); 571 GvCV_set(gv,cv); 572 GvCVGEN(gv) = 0; 573 CvISXSUB_on(cv); 574 CvXSUB(cv) = core_xsub; 575 PoisonPADLIST(cv); 576 } 577 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE 578 from PL_curcop. */ 579 /* XSUBs can't be perl lang/perl5db.pl debugged 580 if (PERLDB_LINE_OR_SAVESRC) 581 (void)gv_fetchfile(file); */ 582 CvFILE(cv) = (char *)file; 583 /* XXX This is inefficient, as doing things this order causes 584 a prototype check in newATTRSUB. But we have to do 585 it this order as we need an op number before calling 586 new ATTRSUB. */ 587 (void)core_prototype((SV *)cv, name, code, &opnum); 588 if (stash) 589 (void)hv_store(stash,name,len,(SV *)gv,0); 590 if (ampable) { 591 #ifdef DEBUGGING 592 CV *orig_cv = cv; 593 #endif 594 CvLVALUE_on(cv); 595 /* newATTRSUB will free the CV and return NULL if we're still 596 compiling after a syntax error */ 597 if ((cv = newATTRSUB_x( 598 oldsavestack_ix, (OP *)gv, 599 NULL,NULL, 600 coresub_op( 601 opnum 602 ? newSVuv((UV)opnum) 603 : newSVpvn(name,len), 604 code, opnum 605 ), 606 TRUE 607 )) != NULL) { 608 assert(GvCV(gv) == orig_cv); 609 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS 610 && opnum != OP_UNDEF && opnum != OP_KEYS) 611 CvLVALUE_off(cv); /* Now *that* was a neat trick. */ 612 } 613 LEAVE; 614 PL_parser = oldparser; 615 PL_curcop = oldcurcop; 616 PL_compcv = oldcompcv; 617 } 618 if (cv) { 619 SV *opnumsv = newSViv( 620 (opnum == OP_ENTEREVAL && len == 9 && memEQ(name, "evalbytes", 9)) ? 621 (OP_ENTEREVAL | (1<<16)) 622 : opnum ? opnum : (((I32)name[2]) << 16)); 623 cv_set_call_checker_flags(cv, Perl_ck_entersub_args_core, opnumsv, 0); 624 SvREFCNT_dec_NN(opnumsv); 625 } 626 627 return gv; 628 } 629 630 /* 631 =for apidoc gv_fetchmeth 632 633 Like L</gv_fetchmeth_pvn>, but lacks a flags parameter. 634 635 =for apidoc gv_fetchmeth_sv 636 637 Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form 638 of an SV instead of a string/length pair. 639 640 =cut 641 */ 642 643 GV * 644 Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags) 645 { 646 char *namepv; 647 STRLEN namelen; 648 PERL_ARGS_ASSERT_GV_FETCHMETH_SV; 649 if (LIKELY(SvPOK_nog(namesv))) /* common case */ 650 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, 651 flags | SvUTF8(namesv)); 652 namepv = SvPV(namesv, namelen); 653 if (SvUTF8(namesv)) flags |= SVf_UTF8; 654 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags); 655 } 656 657 /* 658 =for apidoc gv_fetchmeth_pv 659 660 Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string 661 instead of a string/length pair. 662 663 =cut 664 */ 665 666 GV * 667 Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags) 668 { 669 PERL_ARGS_ASSERT_GV_FETCHMETH_PV; 670 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags); 671 } 672 673 /* 674 =for apidoc gv_fetchmeth_pvn 675 676 Returns the glob with the given C<name> and a defined subroutine or 677 C<NULL>. The glob lives in the given C<stash>, or in the stashes 678 accessible via C<@ISA> and C<UNIVERSAL::>. 679 680 The argument C<level> should be either 0 or -1. If C<level==0>, as a 681 side-effect creates a glob with the given C<name> in the given C<stash> 682 which in the case of success contains an alias for the subroutine, and sets 683 up caching info for this glob. 684 685 The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>. 686 687 C<GV_SUPER> indicates that we want to look up the method in the superclasses 688 of the C<stash>. 689 690 The 691 GV returned from C<gv_fetchmeth> may be a method cache entry, which is not 692 visible to Perl code. So when calling C<call_sv>, you should not use 693 the GV directly; instead, you should use the method's CV, which can be 694 obtained from the GV with the C<GvCV> macro. 695 696 =cut 697 */ 698 699 /* NOTE: No support for tied ISA */ 700 701 PERL_STATIC_INLINE GV* 702 S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags) 703 { 704 GV** gvp; 705 HE* he; 706 AV* linear_av; 707 SV** linear_svp; 708 SV* linear_sv; 709 HV* cstash, *cachestash; 710 GV* candidate = NULL; 711 CV* cand_cv = NULL; 712 GV* topgv = NULL; 713 const char *hvname; 714 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0; 715 I32 items; 716 U32 topgen_cmp; 717 U32 is_utf8 = flags & SVf_UTF8; 718 719 /* UNIVERSAL methods should be callable without a stash */ 720 if (!stash) { 721 create = 0; /* probably appropriate */ 722 if(!(stash = gv_stashpvs("UNIVERSAL", 0))) 723 return 0; 724 } 725 726 assert(stash); 727 728 hvname = HvNAME_get(stash); 729 if (!hvname) 730 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup"); 731 732 assert(hvname); 733 assert(name || meth); 734 735 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n", 736 flags & GV_SUPER ? "SUPER " : "", 737 name ? name : SvPV_nolen(meth), hvname) ); 738 739 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation; 740 741 if (flags & GV_SUPER) { 742 if (!HvAUX(stash)->xhv_mro_meta->super) 743 HvAUX(stash)->xhv_mro_meta->super = newHV(); 744 cachestash = HvAUX(stash)->xhv_mro_meta->super; 745 } 746 else cachestash = stash; 747 748 /* check locally for a real method or a cache entry */ 749 he = (HE*)hv_common( 750 cachestash, meth, name, len, is_utf8 ? HVhek_UTF8 : 0, create, NULL, 0 751 ); 752 if (he) gvp = (GV**)&HeVAL(he); 753 else gvp = NULL; 754 755 if(gvp) { 756 topgv = *gvp; 757 have_gv: 758 assert(topgv); 759 if (SvTYPE(topgv) != SVt_PVGV) 760 { 761 if (!name) 762 name = SvPV_nomg(meth, len); 763 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8); 764 } 765 if ((cand_cv = GvCV(topgv))) { 766 /* If genuine method or valid cache entry, use it */ 767 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) { 768 return topgv; 769 } 770 else { 771 /* stale cache entry, junk it and move on */ 772 SvREFCNT_dec_NN(cand_cv); 773 GvCV_set(topgv, NULL); 774 cand_cv = NULL; 775 GvCVGEN(topgv) = 0; 776 } 777 } 778 else if (GvCVGEN(topgv) == topgen_cmp) { 779 /* cache indicates no such method definitively */ 780 return 0; 781 } 782 else if (stash == cachestash 783 && len > 1 /* shortest is uc */ 784 && memEQs(hvname, HvNAMELEN_get(stash), "CORE") 785 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len)) 786 goto have_gv; 787 } 788 789 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */ 790 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */ 791 items = AvFILLp(linear_av); /* no +1, to skip over self */ 792 while (items--) { 793 linear_sv = *linear_svp++; 794 assert(linear_sv); 795 cstash = gv_stashsv(linear_sv, 0); 796 797 if (!cstash) { 798 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), 799 "Can't locate package %" SVf " for @%" HEKf "::ISA", 800 SVfARG(linear_sv), 801 HEKfARG(HvNAME_HEK(stash))); 802 continue; 803 } 804 805 assert(cstash); 806 807 gvp = (GV**)hv_common( 808 cstash, meth, name, len, is_utf8 ? HVhek_UTF8 : 0, HV_FETCH_JUST_SV, NULL, 0 809 ); 810 if (!gvp) { 811 if (len > 1 && HvNAMELEN_get(cstash) == 4) { 812 const char *hvname = HvNAME(cstash); assert(hvname); 813 if (strBEGINs(hvname, "CORE") 814 && (candidate = 815 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len) 816 )) 817 goto have_candidate; 818 } 819 continue; 820 } 821 else candidate = *gvp; 822 have_candidate: 823 assert(candidate); 824 if (SvTYPE(candidate) != SVt_PVGV) 825 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8); 826 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { 827 /* 828 * Found real method, cache method in topgv if: 829 * 1. topgv has no synonyms (else inheritance crosses wires) 830 * 2. method isn't a stub (else AUTOLOAD fails spectacularly) 831 */ 832 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) { 833 CV *old_cv = GvCV(topgv); 834 SvREFCNT_dec(old_cv); 835 SvREFCNT_inc_simple_void_NN(cand_cv); 836 GvCV_set(topgv, cand_cv); 837 GvCVGEN(topgv) = topgen_cmp; 838 } 839 return candidate; 840 } 841 } 842 843 /* Check UNIVERSAL without caching */ 844 if(level == 0 || level == -1) { 845 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1, 846 flags &~GV_SUPER); 847 if(candidate) { 848 cand_cv = GvCV(candidate); 849 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) { 850 CV *old_cv = GvCV(topgv); 851 SvREFCNT_dec(old_cv); 852 SvREFCNT_inc_simple_void_NN(cand_cv); 853 GvCV_set(topgv, cand_cv); 854 GvCVGEN(topgv) = topgen_cmp; 855 } 856 return candidate; 857 } 858 } 859 860 if (topgv && GvREFCNT(topgv) == 1) { 861 /* cache the fact that the method is not defined */ 862 GvCVGEN(topgv) = topgen_cmp; 863 } 864 865 return 0; 866 } 867 868 GV * 869 Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags) 870 { 871 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN; 872 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags); 873 } 874 875 /* 876 =for apidoc gv_fetchmeth_autoload 877 878 This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags 879 parameter. 880 881 =for apidoc gv_fetchmeth_sv_autoload 882 883 Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form 884 of an SV instead of a string/length pair. 885 886 =cut 887 */ 888 889 GV * 890 Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags) 891 { 892 char *namepv; 893 STRLEN namelen; 894 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD; 895 namepv = SvPV(namesv, namelen); 896 if (SvUTF8(namesv)) 897 flags |= SVf_UTF8; 898 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags); 899 } 900 901 /* 902 =for apidoc gv_fetchmeth_pv_autoload 903 904 Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string 905 instead of a string/length pair. 906 907 =cut 908 */ 909 910 GV * 911 Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags) 912 { 913 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD; 914 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags); 915 } 916 917 /* 918 =for apidoc gv_fetchmeth_pvn_autoload 919 920 Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too. 921 Returns a glob for the subroutine. 922 923 For an autoloaded subroutine without a GV, will create a GV even 924 if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()> 925 of the result may be zero. 926 927 Currently, the only significant value for C<flags> is C<SVf_UTF8>. 928 929 =cut 930 */ 931 932 GV * 933 Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags) 934 { 935 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags); 936 937 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD; 938 939 if (!gv) { 940 CV *cv; 941 GV **gvp; 942 943 if (!stash) 944 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */ 945 if (len == S_autolen && memEQ(name, S_autoload, S_autolen)) 946 return NULL; 947 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags))) 948 return NULL; 949 cv = GvCV(gv); 950 if (!(CvROOT(cv) || CvXSUB(cv))) 951 return NULL; 952 /* Have an autoload */ 953 if (level < 0) /* Cannot do without a stub */ 954 gv_fetchmeth_pvn(stash, name, len, 0, flags); 955 gvp = (GV**)hv_fetch(stash, name, 956 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0)); 957 if (!gvp) 958 return NULL; 959 return *gvp; 960 } 961 return gv; 962 } 963 964 /* 965 =for apidoc gv_fetchmethod_autoload 966 967 Returns the glob which contains the subroutine to call to invoke the method 968 on the C<stash>. In fact in the presence of autoloading this may be the 969 glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is 970 already setup. 971 972 The third parameter of C<gv_fetchmethod_autoload> determines whether 973 AUTOLOAD lookup is performed if the given method is not present: non-zero 974 means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD. 975 Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload> 976 with a non-zero C<autoload> parameter. 977 978 These functions grant C<"SUPER"> token 979 as a prefix of the method name. Note 980 that if you want to keep the returned glob for a long time, you need to 981 check for it being "AUTOLOAD", since at the later time the call may load a 982 different subroutine due to C<$AUTOLOAD> changing its value. Use the glob 983 created as a side effect to do this. 984 985 These functions have the same side-effects as C<gv_fetchmeth> with 986 C<level==0>. The warning against passing the GV returned by 987 C<gv_fetchmeth> to C<call_sv> applies equally to these functions. 988 989 =cut 990 */ 991 992 GV * 993 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload) 994 { 995 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD; 996 997 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0); 998 } 999 1000 GV * 1001 Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags) 1002 { 1003 char *namepv; 1004 STRLEN namelen; 1005 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS; 1006 namepv = SvPV(namesv, namelen); 1007 if (SvUTF8(namesv)) 1008 flags |= SVf_UTF8; 1009 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags); 1010 } 1011 1012 GV * 1013 Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags) 1014 { 1015 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS; 1016 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags); 1017 } 1018 1019 GV * 1020 Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags) 1021 { 1022 const char * const origname = name; 1023 const char * const name_end = name + len; 1024 const char *last_separator = NULL; 1025 GV* gv; 1026 HV* ostash = stash; 1027 SV *const error_report = MUTABLE_SV(stash); 1028 const U32 autoload = flags & GV_AUTOLOAD; 1029 const U32 do_croak = flags & GV_CROAK; 1030 const U32 is_utf8 = flags & SVf_UTF8; 1031 1032 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS; 1033 1034 if (SvTYPE(stash) < SVt_PVHV) 1035 stash = NULL; 1036 else { 1037 /* The only way stash can become NULL later on is if last_separator is set, 1038 which in turn means that there is no need for a SVt_PVHV case 1039 the error reporting code. */ 1040 } 1041 1042 { 1043 /* check if the method name is fully qualified or 1044 * not, and separate the package name from the actual 1045 * method name. 1046 * 1047 * leaves last_separator pointing to the beginning of the 1048 * last package separator (either ' or ::) or 0 1049 * if none was found. 1050 * 1051 * leaves name pointing at the beginning of the 1052 * method name. 1053 */ 1054 const char *name_cursor = name; 1055 const char * const name_em1 = name_end - 1; /* name_end minus 1 */ 1056 for (name_cursor = name; name_cursor < name_end ; name_cursor++) { 1057 if (*name_cursor == '\'') { 1058 last_separator = name_cursor; 1059 name = name_cursor + 1; 1060 } 1061 else if (name_cursor < name_em1 && *name_cursor == ':' && name_cursor[1] == ':') { 1062 last_separator = name_cursor++; 1063 name = name_cursor + 1; 1064 } 1065 } 1066 } 1067 1068 /* did we find a separator? */ 1069 if (last_separator) { 1070 STRLEN sep_len= last_separator - origname; 1071 if ( memEQs(origname, sep_len, "SUPER")) { 1072 /* ->SUPER::method should really be looked up in original stash */ 1073 stash = CopSTASH(PL_curcop); 1074 flags |= GV_SUPER; 1075 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n", 1076 origname, HvENAME_get(stash), name) ); 1077 } 1078 else if ( sep_len >= 7 && 1079 strBEGINs(last_separator - 7, "::SUPER")) { 1080 /* don't autovifify if ->NoSuchStash::SUPER::method */ 1081 stash = gv_stashpvn(origname, sep_len - 7, is_utf8); 1082 if (stash) flags |= GV_SUPER; 1083 } 1084 else { 1085 /* don't autovifify if ->NoSuchStash::method */ 1086 stash = gv_stashpvn(origname, sep_len, is_utf8); 1087 } 1088 ostash = stash; 1089 } 1090 1091 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags); 1092 if (!gv) { 1093 /* This is the special case that exempts Foo->import and 1094 Foo->unimport from being an error even if there's no 1095 import/unimport subroutine */ 1096 if (strEQ(name,"import") || strEQ(name,"unimport")) { 1097 gv = (GV*)sv_2mortal((SV*)newCONSTSUB_flags(NULL, 1098 NULL, 0, 0, NULL)); 1099 } else if (autoload) 1100 gv = gv_autoload_pvn( 1101 ostash, name, name_end - name, GV_AUTOLOAD_ISMETHOD|flags 1102 ); 1103 if (!gv && do_croak) { 1104 /* Right now this is exclusively for the benefit of S_method_common 1105 in pp_hot.c */ 1106 if (stash) { 1107 /* If we can't find an IO::File method, it might be a call on 1108 * a filehandle. If IO:File has not been loaded, try to 1109 * require it first instead of croaking */ 1110 const char *stash_name = HvNAME_get(stash); 1111 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File") 1112 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL, 1113 STR_WITH_LEN("IO/File.pm"), 0, 1114 HV_FETCH_ISEXISTS, NULL, 0) 1115 ) { 1116 require_pv("IO/File.pm"); 1117 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags); 1118 if (gv) 1119 return gv; 1120 } 1121 Perl_croak(aTHX_ 1122 "Can't locate object method \"%" UTF8f 1123 "\" via package \"%" HEKf "\"", 1124 UTF8fARG(is_utf8, name_end - name, name), 1125 HEKfARG(HvNAME_HEK(stash))); 1126 } 1127 else { 1128 SV* packnamesv; 1129 1130 if (last_separator) { 1131 packnamesv = newSVpvn_flags(origname, last_separator - origname, 1132 SVs_TEMP | is_utf8); 1133 } else { 1134 packnamesv = error_report; 1135 } 1136 1137 Perl_croak(aTHX_ 1138 "Can't locate object method \"%" UTF8f 1139 "\" via package \"%" SVf "\"" 1140 " (perhaps you forgot to load \"%" SVf "\"?)", 1141 UTF8fARG(is_utf8, name_end - name, name), 1142 SVfARG(packnamesv), SVfARG(packnamesv)); 1143 } 1144 } 1145 } 1146 else if (autoload) { 1147 CV* const cv = GvCV(gv); 1148 if (!CvROOT(cv) && !CvXSUB(cv)) { 1149 GV* stubgv; 1150 GV* autogv; 1151 1152 if (CvANON(cv) || CvLEXICAL(cv)) 1153 stubgv = gv; 1154 else { 1155 stubgv = CvGV(cv); 1156 if (GvCV(stubgv) != cv) /* orphaned import */ 1157 stubgv = gv; 1158 } 1159 autogv = gv_autoload_pvn(GvSTASH(stubgv), 1160 GvNAME(stubgv), GvNAMELEN(stubgv), 1161 GV_AUTOLOAD_ISMETHOD 1162 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0)); 1163 if (autogv) 1164 gv = autogv; 1165 } 1166 } 1167 1168 return gv; 1169 } 1170 1171 GV* 1172 Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags) 1173 { 1174 char *namepv; 1175 STRLEN namelen; 1176 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV; 1177 namepv = SvPV(namesv, namelen); 1178 if (SvUTF8(namesv)) 1179 flags |= SVf_UTF8; 1180 return gv_autoload_pvn(stash, namepv, namelen, flags); 1181 } 1182 1183 GV* 1184 Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags) 1185 { 1186 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV; 1187 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags); 1188 } 1189 1190 GV* 1191 Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags) 1192 { 1193 GV* gv; 1194 CV* cv; 1195 HV* varstash; 1196 GV* vargv; 1197 SV* varsv; 1198 SV *packname = NULL; 1199 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0; 1200 1201 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN; 1202 1203 if (len == S_autolen && memEQ(name, S_autoload, S_autolen)) 1204 return NULL; 1205 if (stash) { 1206 if (SvTYPE(stash) < SVt_PVHV) { 1207 STRLEN packname_len = 0; 1208 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len); 1209 packname = newSVpvn_flags(packname_ptr, packname_len, 1210 SVs_TEMP | SvUTF8(stash)); 1211 stash = NULL; 1212 } 1213 else 1214 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash))); 1215 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER"); 1216 } 1217 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, 1218 is_utf8 | (flags & GV_SUPER)))) 1219 return NULL; 1220 cv = GvCV(gv); 1221 1222 if (!(CvROOT(cv) || CvXSUB(cv))) 1223 return NULL; 1224 1225 /* 1226 * Inheriting AUTOLOAD for non-methods no longer works 1227 */ 1228 if ( 1229 !(flags & GV_AUTOLOAD_ISMETHOD) 1230 && (GvCVGEN(gv) || GvSTASH(gv) != stash) 1231 ) 1232 Perl_croak(aTHX_ "Use of inherited AUTOLOAD for non-method %" SVf 1233 "::%" UTF8f "() is no longer allowed", 1234 SVfARG(packname), 1235 UTF8fARG(is_utf8, len, name)); 1236 1237 if (CvISXSUB(cv)) { 1238 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD 1239 * and split that value on the last '::', pass along the same data 1240 * via the SvPVX field in the CV, and the stash in CvSTASH. 1241 * 1242 * Due to an unfortunate accident of history, the SvPVX field 1243 * serves two purposes. It is also used for the subroutine's pro- 1244 * type. Since SvPVX has been documented as returning the sub name 1245 * for a long time, but not as returning the prototype, we have 1246 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype 1247 * elsewhere. 1248 * 1249 * We put the prototype in the same allocated buffer, but after 1250 * the sub name. The SvPOK flag indicates the presence of a proto- 1251 * type. The CvAUTOLOAD flag indicates the presence of a sub name. 1252 * If both flags are on, then SvLEN is used to indicate the end of 1253 * the prototype (artificially lower than what is actually allo- 1254 * cated), at the risk of having to reallocate a few bytes unneces- 1255 * sarily--but that should happen very rarely, if ever. 1256 * 1257 * We use SvUTF8 for both prototypes and sub names, so if one is 1258 * UTF8, the other must be upgraded. 1259 */ 1260 CvSTASH_set(cv, stash); 1261 if (SvPOK(cv)) { /* Ouch! */ 1262 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8); 1263 STRLEN ulen; 1264 const char *proto = CvPROTO(cv); 1265 assert(proto); 1266 if (SvUTF8(cv)) 1267 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2); 1268 ulen = SvCUR(tmpsv); 1269 SvCUR(tmpsv)++; /* include null in string */ 1270 sv_catpvn_flags( 1271 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv) 1272 ); 1273 SvTEMP_on(tmpsv); /* Allow theft */ 1274 sv_setsv_nomg((SV *)cv, tmpsv); 1275 SvTEMP_off(tmpsv); 1276 SvREFCNT_dec_NN(tmpsv); 1277 SvLEN_set(cv, SvCUR(cv) + 1); 1278 SvCUR(cv) = ulen; 1279 } 1280 else { 1281 sv_setpvn((SV *)cv, name, len); 1282 SvPOK_off(cv); 1283 if (is_utf8) 1284 SvUTF8_on(cv); 1285 else SvUTF8_off(cv); 1286 } 1287 CvAUTOLOAD_on(cv); 1288 } 1289 1290 /* 1291 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name. 1292 * The subroutine's original name may not be "AUTOLOAD", so we don't 1293 * use that, but for lack of anything better we will use the sub's 1294 * original package to look up $AUTOLOAD. 1295 */ 1296 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)); 1297 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE); 1298 ENTER; 1299 1300 if (!isGV(vargv)) { 1301 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0); 1302 #ifdef PERL_DONT_CREATE_GVSV 1303 GvSV(vargv) = newSV(0); 1304 #endif 1305 } 1306 LEAVE; 1307 varsv = GvSVn(vargv); 1308 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */ 1309 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */ 1310 sv_setsv(varsv, packname); 1311 sv_catpvs(varsv, "::"); 1312 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear 1313 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */ 1314 sv_catpvn_flags( 1315 varsv, name, len, 1316 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES) 1317 ); 1318 if (is_utf8) 1319 SvUTF8_on(varsv); 1320 return gv; 1321 } 1322 1323 1324 /* require_tie_mod() internal routine for requiring a module 1325 * that implements the logic of automatic ties like %! and %- 1326 * It loads the module and then calls the _tie_it subroutine 1327 * with the passed gv as an argument. 1328 * 1329 * The "gv" parameter should be the glob. 1330 * "varname" holds the 1-char name of the var, used for error messages. 1331 * "namesv" holds the module name. Its refcount will be decremented. 1332 * "flags": if flag & 1 then save the scalar before loading. 1333 * For the protection of $! to work (it is set by this routine) 1334 * the sv slot must already be magicalized. 1335 */ 1336 STATIC void 1337 S_require_tie_mod(pTHX_ GV *gv, const char varname, const char * name, 1338 STRLEN len, const U32 flags) 1339 { 1340 const SV * const target = varname == '[' ? GvSV(gv) : (SV *)GvHV(gv); 1341 1342 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD; 1343 1344 /* If it is not tied */ 1345 if (!target || !SvRMAGICAL(target) 1346 || !mg_find(target, 1347 varname == '[' ? PERL_MAGIC_tiedscalar : PERL_MAGIC_tied)) 1348 { 1349 HV *stash; 1350 GV **gvp; 1351 dSP; 1352 1353 PUSHSTACKi(PERLSI_MAGIC); 1354 ENTER; 1355 1356 #define GET_HV_FETCH_TIE_FUNC \ 1357 ( (gvp = (GV **)hv_fetchs(stash, "_tie_it", 0)) \ 1358 && *gvp \ 1359 && ( (isGV(*gvp) && GvCV(*gvp)) \ 1360 || (SvROK(*gvp) && SvTYPE(SvRV(*gvp)) == SVt_PVCV) ) \ 1361 ) 1362 1363 /* Load the module if it is not loaded. */ 1364 if (!(stash = gv_stashpvn(name, len, 0)) 1365 || ! GET_HV_FETCH_TIE_FUNC) 1366 { 1367 SV * const module = newSVpvn(name, len); 1368 const char type = varname == '[' ? '$' : '%'; 1369 if ( flags & 1 ) 1370 save_scalar(gv); 1371 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL); 1372 assert(sp == PL_stack_sp); 1373 stash = gv_stashpvn(name, len, 0); 1374 if (!stash) 1375 Perl_croak(aTHX_ "panic: Can't use %c%c because %s is not available", 1376 type, varname, name); 1377 else if (! GET_HV_FETCH_TIE_FUNC) 1378 Perl_croak(aTHX_ "panic: Can't use %c%c because %s does not define _tie_it", 1379 type, varname, name); 1380 } 1381 /* Now call the tie function. It should be in *gvp. */ 1382 assert(gvp); assert(*gvp); 1383 PUSHMARK(SP); 1384 XPUSHs((SV *)gv); 1385 PUTBACK; 1386 call_sv((SV *)*gvp, G_VOID|G_DISCARD); 1387 LEAVE; 1388 POPSTACK; 1389 } 1390 } 1391 1392 /* add a require_tie_mod_s - the _s suffix is similar to pvs type suffixes, 1393 * IOW it means we do STR_WITH_LEN() ourselves and the user should pass in 1394 * a true string WITHOUT a len. 1395 */ 1396 #define require_tie_mod_s(gv, varname, name, flags) \ 1397 S_require_tie_mod(aTHX_ gv, varname, STR_WITH_LEN(name), flags) 1398 1399 /* 1400 =for apidoc gv_stashpv 1401 1402 Returns a pointer to the stash for a specified package. Uses C<strlen> to 1403 determine the length of C<name>, then calls C<gv_stashpvn()>. 1404 1405 =cut 1406 */ 1407 1408 HV* 1409 Perl_gv_stashpv(pTHX_ const char *name, I32 create) 1410 { 1411 PERL_ARGS_ASSERT_GV_STASHPV; 1412 return gv_stashpvn(name, strlen(name), create); 1413 } 1414 1415 /* 1416 =for apidoc gv_stashpvn 1417 1418 Returns a pointer to the stash for a specified package. The C<namelen> 1419 parameter indicates the length of the C<name>, in bytes. C<flags> is passed 1420 to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be 1421 created if it does not already exist. If the package does not exist and 1422 C<flags> is 0 (or any other setting that does not create packages) then C<NULL> 1423 is returned. 1424 1425 Flags may be one of: 1426 1427 GV_ADD 1428 SVf_UTF8 1429 GV_NOADD_NOINIT 1430 GV_NOINIT 1431 GV_NOEXPAND 1432 GV_ADDMG 1433 1434 The most important of which are probably C<GV_ADD> and C<SVf_UTF8>. 1435 1436 Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly 1437 recommended for performance reasons. 1438 1439 =cut 1440 */ 1441 1442 /* 1443 gv_stashpvn_internal 1444 1445 Perform the internal bits of gv_stashsvpvn_cached. You could think of this 1446 as being one half of the logic. Not to be called except from gv_stashsvpvn_cached(). 1447 1448 */ 1449 1450 PERL_STATIC_INLINE HV* 1451 S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags) 1452 { 1453 char smallbuf[128]; 1454 char *tmpbuf; 1455 HV *stash; 1456 GV *tmpgv; 1457 U32 tmplen = namelen + 2; 1458 1459 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL; 1460 1461 if (tmplen <= sizeof smallbuf) 1462 tmpbuf = smallbuf; 1463 else 1464 Newx(tmpbuf, tmplen, char); 1465 Copy(name, tmpbuf, namelen, char); 1466 tmpbuf[namelen] = ':'; 1467 tmpbuf[namelen+1] = ':'; 1468 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV); 1469 if (tmpbuf != smallbuf) 1470 Safefree(tmpbuf); 1471 if (!tmpgv || !isGV_with_GP(tmpgv)) 1472 return NULL; 1473 stash = GvHV(tmpgv); 1474 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL; 1475 assert(stash); 1476 if (!HvNAME_get(stash)) { 1477 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 ); 1478 1479 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */ 1480 /* If the containing stash has multiple effective 1481 names, see that this one gets them, too. */ 1482 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count) 1483 mro_package_moved(stash, NULL, tmpgv, 1); 1484 } 1485 return stash; 1486 } 1487 1488 /* 1489 gv_stashsvpvn_cached 1490 1491 Returns a pointer to the stash for a specified package, possibly 1492 cached. Implements both C<gv_stashpvn> and C<gv_stashsv>. 1493 1494 Requires one of either namesv or namepv to be non-null. 1495 1496 See C<L</gv_stashpvn>> for details on "flags". 1497 1498 Note the sv interface is strongly preferred for performance reasons. 1499 1500 */ 1501 1502 #define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \ 1503 assert(namesv || name) 1504 1505 PERL_STATIC_INLINE HV* 1506 S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags) 1507 { 1508 HV* stash; 1509 HE* he; 1510 1511 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED; 1512 1513 he = (HE *)hv_common( 1514 PL_stashcache, namesv, name, namelen, 1515 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0 1516 ); 1517 1518 if (he) { 1519 SV *sv = HeVAL(he); 1520 HV *hv; 1521 assert(SvIOK(sv)); 1522 hv = INT2PTR(HV*, SvIVX(sv)); 1523 assert(SvTYPE(hv) == SVt_PVHV); 1524 return hv; 1525 } 1526 else if (flags & GV_CACHE_ONLY) return NULL; 1527 1528 if (namesv) { 1529 if (SvOK(namesv)) { /* prevent double uninit warning */ 1530 STRLEN len; 1531 name = SvPV_const(namesv, len); 1532 namelen = len; 1533 flags |= SvUTF8(namesv); 1534 } else { 1535 name = ""; namelen = 0; 1536 } 1537 } 1538 stash = gv_stashpvn_internal(name, namelen, flags); 1539 1540 if (stash && namelen) { 1541 SV* const ref = newSViv(PTR2IV(stash)); 1542 (void)hv_store(PL_stashcache, name, 1543 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0); 1544 } 1545 1546 return stash; 1547 } 1548 1549 HV* 1550 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags) 1551 { 1552 PERL_ARGS_ASSERT_GV_STASHPVN; 1553 return gv_stashsvpvn_cached(NULL, name, namelen, flags); 1554 } 1555 1556 /* 1557 =for apidoc gv_stashsv 1558 1559 Returns a pointer to the stash for a specified package. See 1560 C<L</gv_stashpvn>>. 1561 1562 Note this interface is strongly preferred over C<gv_stashpvn> for performance 1563 reasons. 1564 1565 =cut 1566 */ 1567 1568 HV* 1569 Perl_gv_stashsv(pTHX_ SV *sv, I32 flags) 1570 { 1571 PERL_ARGS_ASSERT_GV_STASHSV; 1572 return gv_stashsvpvn_cached(sv, NULL, 0, flags); 1573 } 1574 1575 1576 GV * 1577 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) { 1578 PERL_ARGS_ASSERT_GV_FETCHPV; 1579 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type); 1580 } 1581 1582 GV * 1583 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) { 1584 STRLEN len; 1585 const char * const nambeg = 1586 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC); 1587 PERL_ARGS_ASSERT_GV_FETCHSV; 1588 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type); 1589 } 1590 1591 PERL_STATIC_INLINE void 1592 S_gv_magicalize_isa(pTHX_ GV *gv) 1593 { 1594 AV* av; 1595 1596 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA; 1597 1598 av = GvAVn(gv); 1599 GvMULTI_on(gv); 1600 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa, 1601 NULL, 0); 1602 } 1603 1604 /* This function grabs name and tries to split a stash and glob 1605 * from its contents. TODO better description, comments 1606 * 1607 * If the function returns TRUE and 'name == name_end', then 1608 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags 1609 */ 1610 PERL_STATIC_INLINE bool 1611 S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name, 1612 STRLEN *len, const char *nambeg, STRLEN full_len, 1613 const U32 is_utf8, const I32 add) 1614 { 1615 char *tmpfullbuf = NULL; /* only malloc one big chunk of memory when the smallbuff is not large enough */ 1616 const char *name_cursor; 1617 const char *const name_end = nambeg + full_len; 1618 const char *const name_em1 = name_end - 1; 1619 char smallbuf[64]; /* small buffer to avoid a malloc when possible */ 1620 1621 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME; 1622 1623 if ( full_len > 2 1624 && **name == '*' 1625 && isIDFIRST_lazy_if_safe(*name + 1, name_end, is_utf8)) 1626 { 1627 /* accidental stringify on a GV? */ 1628 (*name)++; 1629 } 1630 1631 for (name_cursor = *name; name_cursor < name_end; name_cursor++) { 1632 if (name_cursor < name_em1 && 1633 ((*name_cursor == ':' && name_cursor[1] == ':') 1634 || *name_cursor == '\'')) 1635 { 1636 if (!*stash) 1637 *stash = PL_defstash; 1638 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */ 1639 goto notok; 1640 1641 *len = name_cursor - *name; 1642 if (name_cursor > nambeg) { /* Skip for initial :: or ' */ 1643 const char *key; 1644 GV**gvp; 1645 if (*name_cursor == ':') { 1646 key = *name; 1647 *len += 2; 1648 } 1649 else { /* using ' for package separator */ 1650 /* use our pre-allocated buffer when possible to save a malloc */ 1651 char *tmpbuf; 1652 if ( *len+2 <= sizeof smallbuf) 1653 tmpbuf = smallbuf; 1654 else { 1655 /* only malloc once if needed */ 1656 if (tmpfullbuf == NULL) /* only malloc&free once, a little more than needed */ 1657 Newx(tmpfullbuf, full_len+2, char); 1658 tmpbuf = tmpfullbuf; 1659 } 1660 Copy(*name, tmpbuf, *len, char); 1661 tmpbuf[(*len)++] = ':'; 1662 tmpbuf[(*len)++] = ':'; 1663 key = tmpbuf; 1664 } 1665 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add); 1666 *gv = gvp ? *gvp : NULL; 1667 if (!*gv || *gv == (const GV *)&PL_sv_undef) { 1668 goto notok; 1669 } 1670 /* here we know that *gv && *gv != &PL_sv_undef */ 1671 if (SvTYPE(*gv) != SVt_PVGV) 1672 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8); 1673 else 1674 GvMULTI_on(*gv); 1675 1676 if (!(*stash = GvHV(*gv))) { 1677 *stash = GvHV(*gv) = newHV(); 1678 if (!HvNAME_get(*stash)) { 1679 if (GvSTASH(*gv) == PL_defstash && *len == 6 1680 && strBEGINs(*name, "CORE")) 1681 hv_name_sets(*stash, "CORE", 0); 1682 else 1683 hv_name_set( 1684 *stash, nambeg, name_cursor-nambeg, is_utf8 1685 ); 1686 /* If the containing stash has multiple effective 1687 names, see that this one gets them, too. */ 1688 if (HvAUX(GvSTASH(*gv))->xhv_name_count) 1689 mro_package_moved(*stash, NULL, *gv, 1); 1690 } 1691 } 1692 else if (!HvNAME_get(*stash)) 1693 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8); 1694 } 1695 1696 if (*name_cursor == ':') 1697 name_cursor++; 1698 *name = name_cursor+1; 1699 if (*name == name_end) { 1700 if (!*gv) { 1701 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE)); 1702 if (SvTYPE(*gv) != SVt_PVGV) { 1703 gv_init_pvn(*gv, PL_defstash, "main::", 6, 1704 GV_ADDMULTI); 1705 GvHV(*gv) = 1706 MUTABLE_HV(SvREFCNT_inc_simple(PL_defstash)); 1707 } 1708 } 1709 goto ok; 1710 } 1711 } 1712 } 1713 *len = name_cursor - *name; 1714 ok: 1715 Safefree(tmpfullbuf); /* free our tmpfullbuf if it was used */ 1716 return TRUE; 1717 notok: 1718 Safefree(tmpfullbuf); /* free our tmpfullbuf if it was used */ 1719 return FALSE; 1720 } 1721 1722 1723 /* Checks if an unqualified name is in the main stash */ 1724 PERL_STATIC_INLINE bool 1725 S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8) 1726 { 1727 PERL_ARGS_ASSERT_GV_IS_IN_MAIN; 1728 1729 /* If it's an alphanumeric variable */ 1730 if ( len && isIDFIRST_lazy_if_safe(name, name + len, is_utf8) ) { 1731 /* Some "normal" variables are always in main::, 1732 * like INC or STDOUT. 1733 */ 1734 switch (len) { 1735 case 1: 1736 if (*name == '_') 1737 return TRUE; 1738 break; 1739 case 3: 1740 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C') 1741 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V') 1742 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G')) 1743 return TRUE; 1744 break; 1745 case 4: 1746 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G' 1747 && name[3] == 'V') 1748 return TRUE; 1749 break; 1750 case 5: 1751 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D' 1752 && name[3] == 'I' && name[4] == 'N') 1753 return TRUE; 1754 break; 1755 case 6: 1756 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D') 1757 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T') 1758 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R'))) 1759 return TRUE; 1760 break; 1761 case 7: 1762 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G' 1763 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U' 1764 && name[6] == 'T') 1765 return TRUE; 1766 break; 1767 } 1768 } 1769 /* *{""}, or a special variable like $@ */ 1770 else 1771 return TRUE; 1772 1773 return FALSE; 1774 } 1775 1776 1777 /* This function is called if parse_gv_stash_name() failed to 1778 * find a stash, or if GV_NOTQUAL or an empty name was passed 1779 * to gv_fetchpvn_flags. 1780 * 1781 * It returns FALSE if the default stash can't be found nor created, 1782 * which might happen during global destruction. 1783 */ 1784 PERL_STATIC_INLINE bool 1785 S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len, 1786 const U32 is_utf8, const I32 add, 1787 const svtype sv_type) 1788 { 1789 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH; 1790 1791 /* No stash in name, so see how we can default */ 1792 1793 if ( gv_is_in_main(name, len, is_utf8) ) { 1794 *stash = PL_defstash; 1795 } 1796 else { 1797 if (IN_PERL_COMPILETIME) { 1798 *stash = PL_curstash; 1799 if (add && (PL_hints & HINT_STRICT_VARS) && 1800 sv_type != SVt_PVCV && 1801 sv_type != SVt_PVGV && 1802 sv_type != SVt_PVFM && 1803 sv_type != SVt_PVIO && 1804 !(len == 1 && sv_type == SVt_PV && 1805 (*name == 'a' || *name == 'b')) ) 1806 { 1807 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0); 1808 if (!gvp || *gvp == (const GV *)&PL_sv_undef || 1809 SvTYPE(*gvp) != SVt_PVGV) 1810 { 1811 *stash = NULL; 1812 } 1813 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) || 1814 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) || 1815 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) ) 1816 { 1817 /* diag_listed_as: Variable "%s" is not imported%s */ 1818 Perl_ck_warner_d( 1819 aTHX_ packWARN(WARN_MISC), 1820 "Variable \"%c%" UTF8f "\" is not imported", 1821 sv_type == SVt_PVAV ? '@' : 1822 sv_type == SVt_PVHV ? '%' : '$', 1823 UTF8fARG(is_utf8, len, name)); 1824 if (GvCVu(*gvp)) 1825 Perl_ck_warner_d( 1826 aTHX_ packWARN(WARN_MISC), 1827 "\t(Did you mean &%" UTF8f " instead?)\n", 1828 UTF8fARG(is_utf8, len, name) 1829 ); 1830 *stash = NULL; 1831 } 1832 } 1833 } 1834 else { 1835 /* Use the current op's stash */ 1836 *stash = CopSTASH(PL_curcop); 1837 } 1838 } 1839 1840 if (!*stash) { 1841 if (add && !PL_in_clean_all) { 1842 GV *gv; 1843 qerror(Perl_mess(aTHX_ 1844 "Global symbol \"%s%" UTF8f 1845 "\" requires explicit package name (did you forget to " 1846 "declare \"my %s%" UTF8f "\"?)", 1847 (sv_type == SVt_PV ? "$" 1848 : sv_type == SVt_PVAV ? "@" 1849 : sv_type == SVt_PVHV ? "%" 1850 : ""), UTF8fARG(is_utf8, len, name), 1851 (sv_type == SVt_PV ? "$" 1852 : sv_type == SVt_PVAV ? "@" 1853 : sv_type == SVt_PVHV ? "%" 1854 : ""), UTF8fARG(is_utf8, len, name))); 1855 /* To maintain the output of errors after the strict exception 1856 * above, and to keep compat with older releases, rather than 1857 * placing the variables in the pad, we place 1858 * them in the <none>:: stash. 1859 */ 1860 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV); 1861 if (!gv) { 1862 /* symbol table under destruction */ 1863 return FALSE; 1864 } 1865 *stash = GvHV(gv); 1866 } 1867 else 1868 return FALSE; 1869 } 1870 1871 if (!SvREFCNT(*stash)) /* symbol table under destruction */ 1872 return FALSE; 1873 1874 return TRUE; 1875 } 1876 1877 /* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So 1878 redefine SvREADONLY_on for that purpose. We don’t use it later on in 1879 this file. */ 1880 #undef SvREADONLY_on 1881 #define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY) 1882 1883 /* gv_magicalize() is called by gv_fetchpvn_flags when creating 1884 * a new GV. 1885 * Note that it does not insert the GV into the stash prior to 1886 * magicalization, which some variables require need in order 1887 * to work (like %+, %-, %!), so callers must take care of 1888 * that. 1889 * 1890 * It returns true if the gv did turn out to be magical one; i.e., 1891 * if gv_magicalize actually did something. 1892 */ 1893 PERL_STATIC_INLINE bool 1894 S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, 1895 const svtype sv_type) 1896 { 1897 SSize_t paren; 1898 1899 PERL_ARGS_ASSERT_GV_MAGICALIZE; 1900 1901 if (stash != PL_defstash) { /* not the main stash */ 1902 /* We only have to check for a few names here: a, b, EXPORT, ISA 1903 and VERSION. All the others apply only to the main stash or to 1904 CORE (which is checked right after this). */ 1905 if (len) { 1906 switch (*name) { 1907 case 'E': 1908 if ( 1909 len >= 6 && name[1] == 'X' && 1910 (memEQs(name, len, "EXPORT") 1911 ||memEQs(name, len, "EXPORT_OK") 1912 ||memEQs(name, len, "EXPORT_FAIL") 1913 ||memEQs(name, len, "EXPORT_TAGS")) 1914 ) 1915 GvMULTI_on(gv); 1916 break; 1917 case 'I': 1918 if (memEQs(name, len, "ISA")) 1919 gv_magicalize_isa(gv); 1920 break; 1921 case 'V': 1922 if (memEQs(name, len, "VERSION")) 1923 GvMULTI_on(gv); 1924 break; 1925 case 'a': 1926 if (stash == PL_debstash && memEQs(name, len, "args")) { 1927 GvMULTI_on(gv_AVadd(gv)); 1928 break; 1929 } 1930 /* FALLTHROUGH */ 1931 case 'b': 1932 if (len == 1 && sv_type == SVt_PV) 1933 GvMULTI_on(gv); 1934 /* FALLTHROUGH */ 1935 default: 1936 goto try_core; 1937 } 1938 goto ret; 1939 } 1940 try_core: 1941 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) { 1942 /* Avoid null warning: */ 1943 const char * const stashname = HvNAME(stash); assert(stashname); 1944 if (strBEGINs(stashname, "CORE")) 1945 S_maybe_add_coresub(aTHX_ 0, gv, name, len); 1946 } 1947 } 1948 else if (len > 1) { 1949 #ifndef EBCDIC 1950 if (*name > 'V' ) { 1951 NOOP; 1952 /* Nothing else to do. 1953 The compiler will probably turn the switch statement into a 1954 branch table. Make sure we avoid even that small overhead for 1955 the common case of lower case variable names. (On EBCDIC 1956 platforms, we can't just do: 1957 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) { 1958 because cases like '\027' in the switch statement below are 1959 C1 (non-ASCII) controls on those platforms, so the remapping 1960 would make them larger than 'V') 1961 */ 1962 } else 1963 #endif 1964 { 1965 switch (*name) { 1966 case 'A': 1967 if (memEQs(name, len, "ARGV")) { 1968 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START; 1969 } 1970 else if (memEQs(name, len, "ARGVOUT")) { 1971 GvMULTI_on(gv); 1972 } 1973 break; 1974 case 'E': 1975 if ( 1976 len >= 6 && name[1] == 'X' && 1977 (memEQs(name, len, "EXPORT") 1978 ||memEQs(name, len, "EXPORT_OK") 1979 ||memEQs(name, len, "EXPORT_FAIL") 1980 ||memEQs(name, len, "EXPORT_TAGS")) 1981 ) 1982 GvMULTI_on(gv); 1983 break; 1984 case 'I': 1985 if (memEQs(name, len, "ISA")) { 1986 gv_magicalize_isa(gv); 1987 } 1988 break; 1989 case 'S': 1990 if (memEQs(name, len, "SIG")) { 1991 HV *hv; 1992 I32 i; 1993 if (!PL_psig_name) { 1994 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*); 1995 Newxz(PL_psig_pend, SIG_SIZE, int); 1996 PL_psig_ptr = PL_psig_name + SIG_SIZE; 1997 } else { 1998 /* I think that the only way to get here is to re-use an 1999 embedded perl interpreter, where the previous 2000 use didn't clean up fully because 2001 PL_perl_destruct_level was 0. I'm not sure that we 2002 "support" that, in that I suspect in that scenario 2003 there are sufficient other garbage values left in the 2004 interpreter structure that something else will crash 2005 before we get here. I suspect that this is one of 2006 those "doctor, it hurts when I do this" bugs. */ 2007 Zero(PL_psig_name, 2 * SIG_SIZE, SV*); 2008 Zero(PL_psig_pend, SIG_SIZE, int); 2009 } 2010 GvMULTI_on(gv); 2011 hv = GvHVn(gv); 2012 hv_magic(hv, NULL, PERL_MAGIC_sig); 2013 for (i = 1; i < SIG_SIZE; i++) { 2014 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1); 2015 if (init) 2016 sv_setsv(*init, &PL_sv_undef); 2017 } 2018 } 2019 break; 2020 case 'V': 2021 if (memEQs(name, len, "VERSION")) 2022 GvMULTI_on(gv); 2023 break; 2024 case '\003': /* $^CHILD_ERROR_NATIVE */ 2025 if (memEQs(name, len, "\003HILD_ERROR_NATIVE")) 2026 goto magicalize; 2027 /* @{^CAPTURE} %{^CAPTURE} */ 2028 if (memEQs(name, len, "\003APTURE")) { 2029 AV* const av = GvAVn(gv); 2030 const Size_t n = *name; 2031 2032 sv_magic(MUTABLE_SV(av), (SV*)n, PERL_MAGIC_regdata, NULL, 0); 2033 SvREADONLY_on(av); 2034 2035 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) 2036 require_tie_mod_s(gv, '-', "Tie::Hash::NamedCapture",0); 2037 2038 } else /* %{^CAPTURE_ALL} */ 2039 if (memEQs(name, len, "\003APTURE_ALL")) { 2040 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) 2041 require_tie_mod_s(gv, '+', "Tie::Hash::NamedCapture",0); 2042 } 2043 break; 2044 case '\005': /* $^ENCODING */ 2045 if (memEQs(name, len, "\005NCODING")) 2046 goto magicalize; 2047 break; 2048 case '\007': /* $^GLOBAL_PHASE */ 2049 if (memEQs(name, len, "\007LOBAL_PHASE")) 2050 goto ro_magicalize; 2051 break; 2052 case '\014': /* $^LAST_FH */ 2053 if (memEQs(name, len, "\014AST_FH")) 2054 goto ro_magicalize; 2055 break; 2056 case '\015': /* $^MATCH */ 2057 if (memEQs(name, len, "\015ATCH")) { 2058 paren = RX_BUFF_IDX_CARET_FULLMATCH; 2059 goto storeparen; 2060 } 2061 break; 2062 case '\017': /* $^OPEN */ 2063 if (memEQs(name, len, "\017PEN")) 2064 goto magicalize; 2065 break; 2066 case '\020': /* $^PREMATCH $^POSTMATCH */ 2067 if (memEQs(name, len, "\020REMATCH")) { 2068 paren = RX_BUFF_IDX_CARET_PREMATCH; 2069 goto storeparen; 2070 } 2071 if (memEQs(name, len, "\020OSTMATCH")) { 2072 paren = RX_BUFF_IDX_CARET_POSTMATCH; 2073 goto storeparen; 2074 } 2075 break; 2076 case '\023': 2077 if (memEQs(name, len, "\023AFE_LOCALES")) 2078 goto ro_magicalize; 2079 break; 2080 case '\024': /* ${^TAINT} */ 2081 if (memEQs(name, len, "\024AINT")) 2082 goto ro_magicalize; 2083 break; 2084 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */ 2085 if (memEQs(name, len, "\025NICODE")) 2086 goto ro_magicalize; 2087 if (memEQs(name, len, "\025TF8LOCALE")) 2088 goto ro_magicalize; 2089 if (memEQs(name, len, "\025TF8CACHE")) 2090 goto magicalize; 2091 break; 2092 case '\027': /* $^WARNING_BITS */ 2093 if (memEQs(name, len, "\027ARNING_BITS")) 2094 goto magicalize; 2095 #ifdef WIN32 2096 else if (memEQs(name, len, "\027IN32_SLOPPY_STAT")) 2097 goto magicalize; 2098 #endif 2099 break; 2100 case '1': 2101 case '2': 2102 case '3': 2103 case '4': 2104 case '5': 2105 case '6': 2106 case '7': 2107 case '8': 2108 case '9': 2109 { 2110 /* Ensures that we have an all-digit variable, ${"1foo"} fails 2111 this test */ 2112 UV uv; 2113 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX) 2114 goto ret; 2115 /* XXX why are we using a SSize_t? */ 2116 paren = (SSize_t)(I32)uv; 2117 goto storeparen; 2118 } 2119 } 2120 } 2121 } else { 2122 /* Names of length 1. (Or 0. But name is NUL terminated, so that will 2123 be case '\0' in this switch statement (ie a default case) */ 2124 switch (*name) { 2125 case '&': /* $& */ 2126 paren = RX_BUFF_IDX_FULLMATCH; 2127 goto sawampersand; 2128 case '`': /* $` */ 2129 paren = RX_BUFF_IDX_PREMATCH; 2130 goto sawampersand; 2131 case '\'': /* $' */ 2132 paren = RX_BUFF_IDX_POSTMATCH; 2133 sawampersand: 2134 #ifdef PERL_SAWAMPERSAND 2135 if (!( 2136 sv_type == SVt_PVAV || 2137 sv_type == SVt_PVHV || 2138 sv_type == SVt_PVCV || 2139 sv_type == SVt_PVFM || 2140 sv_type == SVt_PVIO 2141 )) { PL_sawampersand |= 2142 (*name == '`') 2143 ? SAWAMPERSAND_LEFT 2144 : (*name == '&') 2145 ? SAWAMPERSAND_MIDDLE 2146 : SAWAMPERSAND_RIGHT; 2147 } 2148 #endif 2149 goto storeparen; 2150 case '1': /* $1 */ 2151 case '2': /* $2 */ 2152 case '3': /* $3 */ 2153 case '4': /* $4 */ 2154 case '5': /* $5 */ 2155 case '6': /* $6 */ 2156 case '7': /* $7 */ 2157 case '8': /* $8 */ 2158 case '9': /* $9 */ 2159 paren = *name - '0'; 2160 2161 storeparen: 2162 /* Flag the capture variables with a NULL mg_ptr 2163 Use mg_len for the array index to lookup. */ 2164 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren); 2165 break; 2166 2167 case ':': /* $: */ 2168 sv_setpv(GvSVn(gv),PL_chopset); 2169 goto magicalize; 2170 2171 case '?': /* $? */ 2172 #ifdef COMPLEX_STATUS 2173 SvUPGRADE(GvSVn(gv), SVt_PVLV); 2174 #endif 2175 goto magicalize; 2176 2177 case '!': /* $! */ 2178 GvMULTI_on(gv); 2179 /* If %! has been used, automatically load Errno.pm. */ 2180 2181 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len); 2182 2183 /* magicalization must be done before require_tie_mod_s is called */ 2184 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) 2185 require_tie_mod_s(gv, '!', "Errno", 1); 2186 2187 break; 2188 case '-': /* $-, %-, @- */ 2189 case '+': /* $+, %+, @+ */ 2190 GvMULTI_on(gv); /* no used once warnings here */ 2191 { /* $- $+ */ 2192 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len); 2193 if (*name == '+') 2194 SvREADONLY_on(GvSVn(gv)); 2195 } 2196 { /* %- %+ */ 2197 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) 2198 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture",0); 2199 } 2200 { /* @- @+ */ 2201 AV* const av = GvAVn(gv); 2202 const Size_t n = *name; 2203 2204 sv_magic(MUTABLE_SV(av), (SV*)n, PERL_MAGIC_regdata, NULL, 0); 2205 SvREADONLY_on(av); 2206 } 2207 break; 2208 case '*': /* $* */ 2209 case '#': /* $# */ 2210 if (sv_type == SVt_PV) 2211 /* diag_listed_as: $* is no longer supported as of Perl 5.30 */ 2212 Perl_croak(aTHX_ "$%c is no longer supported as of Perl 5.30", *name); 2213 break; 2214 case '\010': /* $^H */ 2215 { 2216 HV *const hv = GvHVn(gv); 2217 hv_magic(hv, NULL, PERL_MAGIC_hints); 2218 } 2219 goto magicalize; 2220 case '\023': /* $^S */ 2221 ro_magicalize: 2222 SvREADONLY_on(GvSVn(gv)); 2223 /* FALLTHROUGH */ 2224 case '0': /* $0 */ 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 '\011': /* $^I, NOT \t in EBCDIC */ 2245 case '\016': /* $^N */ 2246 case '\017': /* $^O */ 2247 case '\020': /* $^P */ 2248 case '\024': /* $^T */ 2249 case '\027': /* $^W */ 2250 magicalize: 2251 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len); 2252 break; 2253 2254 case '\014': /* $^L */ 2255 sv_setpvs(GvSVn(gv),"\f"); 2256 break; 2257 case ';': /* $; */ 2258 sv_setpvs(GvSVn(gv),"\034"); 2259 break; 2260 case ']': /* $] */ 2261 { 2262 SV * const sv = GvSV(gv); 2263 if (!sv_derived_from(PL_patchlevel, "version")) 2264 upg_version(PL_patchlevel, TRUE); 2265 GvSV(gv) = vnumify(PL_patchlevel); 2266 SvREADONLY_on(GvSV(gv)); 2267 SvREFCNT_dec(sv); 2268 } 2269 break; 2270 case '\026': /* $^V */ 2271 { 2272 SV * const sv = GvSV(gv); 2273 GvSV(gv) = new_version(PL_patchlevel); 2274 SvREADONLY_on(GvSV(gv)); 2275 SvREFCNT_dec(sv); 2276 } 2277 break; 2278 case 'a': 2279 case 'b': 2280 if (sv_type == SVt_PV) 2281 GvMULTI_on(gv); 2282 } 2283 } 2284 2285 ret: 2286 /* Return true if we actually did something. */ 2287 return GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv) 2288 || ( GvSV(gv) && ( 2289 SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv)) 2290 ) 2291 ); 2292 } 2293 2294 /* If we do ever start using this later on in the file, we need to make 2295 sure we don’t accidentally use the wrong definition. */ 2296 #undef SvREADONLY_on 2297 2298 /* This function is called when the stash already holds the GV of the magic 2299 * variable we're looking for, but we need to check that it has the correct 2300 * kind of magic. For example, if someone first uses $! and then %!, the 2301 * latter would end up here, and we add the Errno tie to the HASH slot of 2302 * the *! glob. 2303 */ 2304 PERL_STATIC_INLINE void 2305 S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type) 2306 { 2307 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV; 2308 2309 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) { 2310 if (*name == '!') 2311 require_tie_mod_s(gv, '!', "Errno", 1); 2312 else if (*name == '-' || *name == '+') 2313 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture", 0); 2314 } else if (sv_type == SVt_PV) { 2315 if (*name == '*' || *name == '#') { 2316 /* diag_listed_as: $* is no longer supported as of Perl 5.30 */ 2317 Perl_croak(aTHX_ "$%c is no longer supported as of Perl 5.30", *name); 2318 } 2319 } 2320 if (sv_type==SVt_PV || sv_type==SVt_PVGV) { 2321 switch (*name) { 2322 #ifdef PERL_SAWAMPERSAND 2323 case '`': 2324 PL_sawampersand |= SAWAMPERSAND_LEFT; 2325 (void)GvSVn(gv); 2326 break; 2327 case '&': 2328 PL_sawampersand |= SAWAMPERSAND_MIDDLE; 2329 (void)GvSVn(gv); 2330 break; 2331 case '\'': 2332 PL_sawampersand |= SAWAMPERSAND_RIGHT; 2333 (void)GvSVn(gv); 2334 break; 2335 #endif 2336 } 2337 } 2338 } 2339 2340 GV * 2341 Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags, 2342 const svtype sv_type) 2343 { 2344 const char *name = nambeg; 2345 GV *gv = NULL; 2346 GV**gvp; 2347 STRLEN len; 2348 HV *stash = NULL; 2349 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT); 2350 const I32 no_expand = flags & GV_NOEXPAND; 2351 const I32 add = flags & ~GV_NOADD_MASK; 2352 const U32 is_utf8 = flags & SVf_UTF8; 2353 bool addmg = cBOOL(flags & GV_ADDMG); 2354 const char *const name_end = nambeg + full_len; 2355 U32 faking_it; 2356 2357 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS; 2358 2359 /* If we have GV_NOTQUAL, the caller promised that 2360 * there is no stash, so we can skip the check. 2361 * Similarly if full_len is 0, since then we're 2362 * dealing with something like *{""} or ""->foo() 2363 */ 2364 if ((flags & GV_NOTQUAL) || !full_len) { 2365 len = full_len; 2366 } 2367 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) { 2368 if (name == name_end) return gv; 2369 } 2370 else { 2371 return NULL; 2372 } 2373 2374 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) { 2375 return NULL; 2376 } 2377 2378 /* By this point we should have a stash and a name */ 2379 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add); 2380 if (!gvp || *gvp == (const GV *)&PL_sv_undef) { 2381 if (addmg) gv = (GV *)newSV(0); 2382 else return NULL; 2383 } 2384 else gv = *gvp, addmg = 0; 2385 /* From this point on, addmg means gv has not been inserted in the 2386 symtab yet. */ 2387 2388 if (SvTYPE(gv) == SVt_PVGV) { 2389 /* The GV already exists, so return it, but check if we need to do 2390 * anything else with it before that. 2391 */ 2392 if (add) { 2393 /* This is the heuristic that handles if a variable triggers the 2394 * 'used only once' warning. If there's already a GV in the stash 2395 * with this name, then we assume that the variable has been used 2396 * before and turn its MULTI flag on. 2397 * It's a heuristic because it can easily be "tricked", like with 2398 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo 2399 * not warning about $main::foo being used just once 2400 */ 2401 GvMULTI_on(gv); 2402 gv_init_svtype(gv, sv_type); 2403 /* You reach this path once the typeglob has already been created, 2404 either by the same or a different sigil. If this path didn't 2405 exist, then (say) referencing $! first, and %! second would 2406 mean that %! was not handled correctly. */ 2407 if (len == 1 && stash == PL_defstash) { 2408 maybe_multimagic_gv(gv, name, sv_type); 2409 } 2410 else if (sv_type == SVt_PVAV 2411 && memEQs(name, len, "ISA") 2412 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv)))) 2413 gv_magicalize_isa(gv); 2414 } 2415 return gv; 2416 } else if (no_init) { 2417 assert(!addmg); 2418 return gv; 2419 } 2420 /* If GV_NOEXPAND is true and what we got off the stash is a ref, 2421 * don't expand it to a glob. This is an optimization so that things 2422 * copying constants over, like Exporter, don't have to be rewritten 2423 * to take into account that you can store more than just globs in 2424 * stashes. 2425 */ 2426 else if (no_expand && SvROK(gv)) { 2427 assert(!addmg); 2428 return gv; 2429 } 2430 2431 /* Adding a new symbol. 2432 Unless of course there was already something non-GV here, in which case 2433 we want to behave as if there was always a GV here, containing some sort 2434 of subroutine. 2435 Otherwise we run the risk of creating things like GvIO, which can cause 2436 subtle bugs. eg the one that tripped up SQL::Translator */ 2437 2438 faking_it = SvOK(gv); 2439 2440 if (add & GV_ADDWARN) 2441 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), 2442 "Had to create %" UTF8f " unexpectedly", 2443 UTF8fARG(is_utf8, name_end-nambeg, nambeg)); 2444 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8); 2445 2446 if ( full_len != 0 2447 && isIDFIRST_lazy_if_safe(name, name + full_len, is_utf8) 2448 && !ckWARN(WARN_ONCE) ) 2449 { 2450 GvMULTI_on(gv) ; 2451 } 2452 2453 /* set up magic where warranted */ 2454 if ( gv_magicalize(gv, stash, name, len, sv_type) ) { 2455 /* See 23496c6 */ 2456 if (addmg) { 2457 /* gv_magicalize magicalised this gv, so we want it 2458 * stored in the symtab. 2459 * Effectively the caller is asking, ‘Does this gv exist?’ 2460 * And we respond, ‘Er, *now* it does!’ 2461 */ 2462 (void)hv_store(stash,name,len,(SV *)gv,0); 2463 } 2464 } 2465 else if (addmg) { 2466 /* The temporary GV created above */ 2467 SvREFCNT_dec_NN(gv); 2468 gv = NULL; 2469 } 2470 2471 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type); 2472 return gv; 2473 } 2474 2475 void 2476 Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain) 2477 { 2478 const char *name; 2479 const HV * const hv = GvSTASH(gv); 2480 2481 PERL_ARGS_ASSERT_GV_FULLNAME4; 2482 2483 sv_setpv(sv, prefix ? prefix : ""); 2484 2485 if (hv && (name = HvNAME(hv))) { 2486 const STRLEN len = HvNAMELEN(hv); 2487 if (keepmain || ! memBEGINs(name, len, "main")) { 2488 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES); 2489 sv_catpvs(sv,"::"); 2490 } 2491 } 2492 else sv_catpvs(sv,"__ANON__::"); 2493 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv)))); 2494 } 2495 2496 void 2497 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain) 2498 { 2499 const GV * const egv = GvEGVx(gv); 2500 2501 PERL_ARGS_ASSERT_GV_EFULLNAME4; 2502 2503 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain); 2504 } 2505 2506 2507 /* recursively scan a stash and any nested stashes looking for entries 2508 * that need the "only used once" warning raised 2509 */ 2510 2511 void 2512 Perl_gv_check(pTHX_ HV *stash) 2513 { 2514 I32 i; 2515 2516 PERL_ARGS_ASSERT_GV_CHECK; 2517 2518 if (!SvOOK(stash)) 2519 return; 2520 2521 assert(HvARRAY(stash)); 2522 2523 for (i = 0; i <= (I32) HvMAX(stash); i++) { 2524 const HE *entry; 2525 /* mark stash is being scanned, to avoid recursing */ 2526 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH; 2527 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) { 2528 GV *gv; 2529 HV *hv; 2530 STRLEN keylen = HeKLEN(entry); 2531 const char * const key = HeKEY(entry); 2532 2533 if (keylen >= 2 && key[keylen-2] == ':' && key[keylen-1] == ':' && 2534 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv))) 2535 { 2536 if (hv != PL_defstash && hv != stash 2537 && !(SvOOK(hv) 2538 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH)) 2539 ) 2540 gv_check(hv); /* nested package */ 2541 } 2542 else if ( HeKLEN(entry) != 0 2543 && *HeKEY(entry) != '_' 2544 && isIDFIRST_lazy_if_safe(HeKEY(entry), 2545 HeKEY(entry) + HeKLEN(entry), 2546 HeUTF8(entry)) ) 2547 { 2548 const char *file; 2549 gv = MUTABLE_GV(HeVAL(entry)); 2550 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv)) 2551 continue; 2552 file = GvFILE(gv); 2553 CopLINE_set(PL_curcop, GvLINE(gv)); 2554 #ifdef USE_ITHREADS 2555 CopFILE(PL_curcop) = (char *)file; /* set for warning */ 2556 #else 2557 CopFILEGV(PL_curcop) 2558 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0); 2559 #endif 2560 Perl_warner(aTHX_ packWARN(WARN_ONCE), 2561 "Name \"%" HEKf "::%" HEKf 2562 "\" used only once: possible typo", 2563 HEKfARG(HvNAME_HEK(stash)), 2564 HEKfARG(GvNAME_HEK(gv))); 2565 } 2566 } 2567 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH; 2568 } 2569 } 2570 2571 GV * 2572 Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags) 2573 { 2574 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS; 2575 assert(!(flags & ~SVf_UTF8)); 2576 2577 return gv_fetchpv(Perl_form(aTHX_ "%" UTF8f "::_GEN_%ld", 2578 UTF8fARG(flags, strlen(pack), pack), 2579 (long)PL_gensym++), 2580 GV_ADD, SVt_PVGV); 2581 } 2582 2583 /* hopefully this is only called on local symbol table entries */ 2584 2585 GP* 2586 Perl_gp_ref(pTHX_ GP *gp) 2587 { 2588 if (!gp) 2589 return NULL; 2590 gp->gp_refcnt++; 2591 if (gp->gp_cv) { 2592 if (gp->gp_cvgen) { 2593 /* If the GP they asked for a reference to contains 2594 a method cache entry, clear it first, so that we 2595 don't infect them with our cached entry */ 2596 SvREFCNT_dec_NN(gp->gp_cv); 2597 gp->gp_cv = NULL; 2598 gp->gp_cvgen = 0; 2599 } 2600 } 2601 return gp; 2602 } 2603 2604 void 2605 Perl_gp_free(pTHX_ GV *gv) 2606 { 2607 GP* gp; 2608 int attempts = 100; 2609 2610 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv))) 2611 return; 2612 if (gp->gp_refcnt == 0) { 2613 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), 2614 "Attempt to free unreferenced glob pointers" 2615 pTHX__FORMAT pTHX__VALUE); 2616 return; 2617 } 2618 if (gp->gp_refcnt > 1) { 2619 borrowed: 2620 if (gp->gp_egv == gv) 2621 gp->gp_egv = 0; 2622 gp->gp_refcnt--; 2623 GvGP_set(gv, NULL); 2624 return; 2625 } 2626 2627 while (1) { 2628 /* Copy and null out all the glob slots, so destructors do not see 2629 freed SVs. */ 2630 HEK * const file_hek = gp->gp_file_hek; 2631 SV * const sv = gp->gp_sv; 2632 AV * const av = gp->gp_av; 2633 HV * const hv = gp->gp_hv; 2634 IO * const io = gp->gp_io; 2635 CV * const cv = gp->gp_cv; 2636 CV * const form = gp->gp_form; 2637 2638 gp->gp_file_hek = NULL; 2639 gp->gp_sv = NULL; 2640 gp->gp_av = NULL; 2641 gp->gp_hv = NULL; 2642 gp->gp_io = NULL; 2643 gp->gp_cv = NULL; 2644 gp->gp_form = NULL; 2645 2646 if (file_hek) 2647 unshare_hek(file_hek); 2648 2649 SvREFCNT_dec(sv); 2650 SvREFCNT_dec(av); 2651 /* FIXME - another reference loop GV -> symtab -> GV ? 2652 Somehow gp->gp_hv can end up pointing at freed garbage. */ 2653 if (hv && SvTYPE(hv) == SVt_PVHV) { 2654 const HEK *hvname_hek = HvNAME_HEK(hv); 2655 if (PL_stashcache && hvname_hek) { 2656 DEBUG_o(Perl_deb(aTHX_ 2657 "gp_free clearing PL_stashcache for '%" HEKf "'\n", 2658 HEKfARG(hvname_hek))); 2659 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD); 2660 } 2661 SvREFCNT_dec(hv); 2662 } 2663 if (io && SvREFCNT(io) == 1 && IoIFP(io) 2664 && (IoTYPE(io) == IoTYPE_WRONLY || 2665 IoTYPE(io) == IoTYPE_RDWR || 2666 IoTYPE(io) == IoTYPE_APPEND) 2667 && ckWARN_d(WARN_IO) 2668 && IoIFP(io) != PerlIO_stdin() 2669 && IoIFP(io) != PerlIO_stdout() 2670 && IoIFP(io) != PerlIO_stderr() 2671 && !(IoFLAGS(io) & IOf_FAKE_DIRP)) 2672 io_close(io, gv, FALSE, TRUE); 2673 SvREFCNT_dec(io); 2674 SvREFCNT_dec(cv); 2675 SvREFCNT_dec(form); 2676 2677 /* Possibly reallocated by a destructor */ 2678 gp = GvGP(gv); 2679 2680 if (!gp->gp_file_hek 2681 && !gp->gp_sv 2682 && !gp->gp_av 2683 && !gp->gp_hv 2684 && !gp->gp_io 2685 && !gp->gp_cv 2686 && !gp->gp_form) break; 2687 2688 if (--attempts == 0) { 2689 Perl_die(aTHX_ 2690 "panic: gp_free failed to free glob pointer - " 2691 "something is repeatedly re-creating entries" 2692 ); 2693 } 2694 } 2695 2696 /* Possibly incremented by a destructor doing glob assignment */ 2697 if (gp->gp_refcnt > 1) goto borrowed; 2698 Safefree(gp); 2699 GvGP_set(gv, NULL); 2700 } 2701 2702 int 2703 Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg) 2704 { 2705 AMT * const amtp = (AMT*)mg->mg_ptr; 2706 PERL_UNUSED_ARG(sv); 2707 2708 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD; 2709 2710 if (amtp && AMT_AMAGIC(amtp)) { 2711 int i; 2712 for (i = 1; i < NofAMmeth; i++) { 2713 CV * const cv = amtp->table[i]; 2714 if (cv) { 2715 SvREFCNT_dec_NN(MUTABLE_SV(cv)); 2716 amtp->table[i] = NULL; 2717 } 2718 } 2719 } 2720 return 0; 2721 } 2722 2723 /* Updates and caches the CV's */ 2724 /* Returns: 2725 * 1 on success and there is some overload 2726 * 0 if there is no overload 2727 * -1 if some error occurred and it couldn't croak 2728 */ 2729 2730 int 2731 Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing) 2732 { 2733 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table); 2734 AMT amt; 2735 const struct mro_meta* stash_meta = HvMROMETA(stash); 2736 U32 newgen; 2737 2738 PERL_ARGS_ASSERT_GV_AMUPDATE; 2739 2740 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen; 2741 if (mg) { 2742 const AMT * const amtp = (AMT*)mg->mg_ptr; 2743 if (amtp->was_ok_sub == newgen) { 2744 return AMT_AMAGIC(amtp) ? 1 : 0; 2745 } 2746 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table); 2747 } 2748 2749 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) ); 2750 2751 Zero(&amt,1,AMT); 2752 amt.was_ok_sub = newgen; 2753 amt.fallback = AMGfallNO; 2754 amt.flags = 0; 2755 2756 { 2757 int filled = 0; 2758 int i; 2759 bool deref_seen = 0; 2760 2761 2762 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */ 2763 2764 /* Try to find via inheritance. */ 2765 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0); 2766 SV * const sv = gv ? GvSV(gv) : NULL; 2767 CV* cv; 2768 2769 if (!gv) 2770 { 2771 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0)) 2772 goto no_table; 2773 } 2774 #ifdef PERL_DONT_CREATE_GVSV 2775 else if (!sv) { 2776 NOOP; /* Equivalent to !SvTRUE and !SvOK */ 2777 } 2778 #endif 2779 else if (SvTRUE(sv)) 2780 /* don't need to set overloading here because fallback => 1 2781 * is the default setting for classes without overloading */ 2782 amt.fallback=AMGfallYES; 2783 else if (SvOK(sv)) { 2784 amt.fallback=AMGfallNEVER; 2785 filled = 1; 2786 } 2787 else { 2788 filled = 1; 2789 } 2790 2791 assert(SvOOK(stash)); 2792 /* initially assume the worst */ 2793 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF; 2794 2795 for (i = 1; i < NofAMmeth; i++) { 2796 const char * const cooky = PL_AMG_names[i]; 2797 /* Human-readable form, for debugging: */ 2798 const char * const cp = AMG_id2name(i); 2799 const STRLEN l = PL_AMG_namelens[i]; 2800 2801 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n", 2802 cp, HvNAME_get(stash)) ); 2803 /* don't fill the cache while looking up! 2804 Creation of inheritance stubs in intermediate packages may 2805 conflict with the logic of runtime method substitution. 2806 Indeed, for inheritance A -> B -> C, if C overloads "+0", 2807 then we could have created stubs for "(+0" in A and C too. 2808 But if B overloads "bool", we may want to use it for 2809 numifying instead of C's "+0". */ 2810 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0); 2811 cv = 0; 2812 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) { 2813 const HEK * const gvhek = CvGvNAME_HEK(cv); 2814 const HEK * const stashek = 2815 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv))); 2816 if (memEQs(HEK_KEY(gvhek), HEK_LEN(gvhek), "nil") 2817 && stashek 2818 && memEQs(HEK_KEY(stashek), HEK_LEN(stashek), "overload")) { 2819 /* This is a hack to support autoloading..., while 2820 knowing *which* methods were declared as overloaded. */ 2821 /* GvSV contains the name of the method. */ 2822 GV *ngv = NULL; 2823 SV *gvsv = GvSV(gv); 2824 2825 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%" SVf256\ 2826 "\" for overloaded \"%s\" in package \"%.256s\"\n", 2827 (void*)GvSV(gv), cp, HvNAME(stash)) ); 2828 if (!gvsv || !SvPOK(gvsv) 2829 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0))) 2830 { 2831 /* Can be an import stub (created by "can"). */ 2832 if (destructing) { 2833 return -1; 2834 } 2835 else { 2836 const SV * const name = (gvsv && SvPOK(gvsv)) 2837 ? gvsv 2838 : newSVpvs_flags("???", SVs_TEMP); 2839 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */ 2840 Perl_croak(aTHX_ "%s method \"%" SVf256 2841 "\" overloading \"%s\" "\ 2842 "in package \"%" HEKf256 "\"", 2843 (GvCVGEN(gv) ? "Stub found while resolving" 2844 : "Can't resolve"), 2845 SVfARG(name), cp, 2846 HEKfARG( 2847 HvNAME_HEK(stash) 2848 )); 2849 } 2850 } 2851 cv = GvCV(gv = ngv); 2852 } 2853 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n", 2854 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))), 2855 GvNAME(CvGV(cv))) ); 2856 filled = 1; 2857 } else if (gv) { /* Autoloaded... */ 2858 cv = MUTABLE_CV(gv); 2859 filled = 1; 2860 } 2861 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv)); 2862 2863 if (gv) { 2864 switch (i) { 2865 case to_sv_amg: 2866 case to_av_amg: 2867 case to_hv_amg: 2868 case to_gv_amg: 2869 case to_cv_amg: 2870 case nomethod_amg: 2871 deref_seen = 1; 2872 break; 2873 } 2874 } 2875 } 2876 if (!deref_seen) 2877 /* none of @{} etc overloaded; we can do $obj->[N] quicker. 2878 * NB - aux var invalid here, HvARRAY() could have been 2879 * reallocated since it was assigned to */ 2880 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF; 2881 2882 if (filled) { 2883 AMT_AMAGIC_on(&amt); 2884 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table, 2885 (char*)&amt, sizeof(AMT)); 2886 return TRUE; 2887 } 2888 } 2889 /* Here we have no table: */ 2890 no_table: 2891 AMT_AMAGIC_off(&amt); 2892 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table, 2893 (char*)&amt, sizeof(AMTS)); 2894 return 0; 2895 } 2896 2897 2898 CV* 2899 Perl_gv_handler(pTHX_ HV *stash, I32 id) 2900 { 2901 MAGIC *mg; 2902 AMT *amtp; 2903 U32 newgen; 2904 struct mro_meta* stash_meta; 2905 2906 if (!stash || !HvNAME_get(stash)) 2907 return NULL; 2908 2909 stash_meta = HvMROMETA(stash); 2910 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen; 2911 2912 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table); 2913 if (!mg) { 2914 do_update: 2915 if (Gv_AMupdate(stash, 0) == -1) 2916 return NULL; 2917 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table); 2918 } 2919 assert(mg); 2920 amtp = (AMT*)mg->mg_ptr; 2921 if ( amtp->was_ok_sub != newgen ) 2922 goto do_update; 2923 if (AMT_AMAGIC(amtp)) { 2924 CV * const ret = amtp->table[id]; 2925 if (ret && isGV(ret)) { /* Autoloading stab */ 2926 /* Passing it through may have resulted in a warning 2927 "Inherited AUTOLOAD for a non-method deprecated", since 2928 our caller is going through a function call, not a method call. 2929 So return the CV for AUTOLOAD, setting $AUTOLOAD. */ 2930 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]); 2931 2932 if (gv && GvCV(gv)) 2933 return GvCV(gv); 2934 } 2935 return ret; 2936 } 2937 2938 return NULL; 2939 } 2940 2941 2942 /* Implement tryAMAGICun_MG macro. 2943 Do get magic, then see if the stack arg is overloaded and if so call it. 2944 Flags: 2945 AMGf_numeric apply sv_2num to the stack arg. 2946 */ 2947 2948 bool 2949 Perl_try_amagic_un(pTHX_ int method, int flags) { 2950 dSP; 2951 SV* tmpsv; 2952 SV* const arg = TOPs; 2953 2954 SvGETMAGIC(arg); 2955 2956 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method, 2957 AMGf_noright | AMGf_unary 2958 | (flags & AMGf_numarg)))) 2959 { 2960 /* where the op is of the form: 2961 * $lex = $x op $y (where the assign is optimised away) 2962 * then assign the returned value to targ and return that; 2963 * otherwise return the value directly 2964 */ 2965 if ( (PL_opargs[PL_op->op_type] & OA_TARGLEX) 2966 && (PL_op->op_private & OPpTARGET_MY)) 2967 { 2968 dTARGET; 2969 sv_setsv(TARG, tmpsv); 2970 SETTARG; 2971 } 2972 else 2973 SETs(tmpsv); 2974 2975 PUTBACK; 2976 return TRUE; 2977 } 2978 2979 if ((flags & AMGf_numeric) && SvROK(arg)) 2980 *sp = sv_2num(arg); 2981 return FALSE; 2982 } 2983 2984 2985 /* Implement tryAMAGICbin_MG macro. 2986 Do get magic, then see if the two stack args are overloaded and if so 2987 call it. 2988 Flags: 2989 AMGf_assign op may be called as mutator (eg +=) 2990 AMGf_numeric apply sv_2num to the stack arg. 2991 */ 2992 2993 bool 2994 Perl_try_amagic_bin(pTHX_ int method, int flags) { 2995 dSP; 2996 SV* const left = TOPm1s; 2997 SV* const right = TOPs; 2998 2999 SvGETMAGIC(left); 3000 if (left != right) 3001 SvGETMAGIC(right); 3002 3003 if (SvAMAGIC(left) || SvAMAGIC(right)) { 3004 SV * tmpsv; 3005 /* STACKED implies mutator variant, e.g. $x += 1 */ 3006 bool mutator = (flags & AMGf_assign) && (PL_op->op_flags & OPf_STACKED); 3007 3008 tmpsv = amagic_call(left, right, method, 3009 (mutator ? AMGf_assign: 0) 3010 | (flags & AMGf_numarg)); 3011 if (tmpsv) { 3012 (void)POPs; 3013 /* where the op is one of the two forms: 3014 * $x op= $y 3015 * $lex = $x op $y (where the assign is optimised away) 3016 * then assign the returned value to targ and return that; 3017 * otherwise return the value directly 3018 */ 3019 if ( mutator 3020 || ( (PL_opargs[PL_op->op_type] & OA_TARGLEX) 3021 && (PL_op->op_private & OPpTARGET_MY))) 3022 { 3023 dTARG; 3024 TARG = mutator ? *SP : PAD_SV(PL_op->op_targ); 3025 sv_setsv(TARG, tmpsv); 3026 SETTARG; 3027 } 3028 else 3029 SETs(tmpsv); 3030 3031 PUTBACK; 3032 return TRUE; 3033 } 3034 } 3035 3036 if(left==right && SvGMAGICAL(left)) { 3037 SV * const left = sv_newmortal(); 3038 *(sp-1) = left; 3039 /* Print the uninitialized warning now, so it includes the vari- 3040 able name. */ 3041 if (!SvOK(right)) { 3042 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right); 3043 sv_setsv_flags(left, &PL_sv_no, 0); 3044 } 3045 else sv_setsv_flags(left, right, 0); 3046 SvGETMAGIC(right); 3047 } 3048 if (flags & AMGf_numeric) { 3049 if (SvROK(TOPm1s)) 3050 *(sp-1) = sv_2num(TOPm1s); 3051 if (SvROK(right)) 3052 *sp = sv_2num(right); 3053 } 3054 return FALSE; 3055 } 3056 3057 SV * 3058 Perl_amagic_deref_call(pTHX_ SV *ref, int method) { 3059 SV *tmpsv = NULL; 3060 HV *stash; 3061 3062 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL; 3063 3064 if (!SvAMAGIC(ref)) 3065 return ref; 3066 /* return quickly if none of the deref ops are overloaded */ 3067 stash = SvSTASH(SvRV(ref)); 3068 assert(SvOOK(stash)); 3069 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF) 3070 return ref; 3071 3072 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method, 3073 AMGf_noright | AMGf_unary))) { 3074 if (!SvROK(tmpsv)) 3075 Perl_croak(aTHX_ "Overloaded dereference did not return a reference"); 3076 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) { 3077 /* Bail out if it returns us the same reference. */ 3078 return tmpsv; 3079 } 3080 ref = tmpsv; 3081 if (!SvAMAGIC(ref)) 3082 break; 3083 } 3084 return tmpsv ? tmpsv : ref; 3085 } 3086 3087 bool 3088 Perl_amagic_is_enabled(pTHX_ int method) 3089 { 3090 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0); 3091 3092 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC); 3093 3094 if ( !lex_mask || !SvOK(lex_mask) ) 3095 /* overloading lexically disabled */ 3096 return FALSE; 3097 else if ( lex_mask && SvPOK(lex_mask) ) { 3098 /* we have an entry in the hints hash, check if method has been 3099 * masked by overloading.pm */ 3100 STRLEN len; 3101 const int offset = method / 8; 3102 const int bit = method % 8; 3103 char *pv = SvPV(lex_mask, len); 3104 3105 /* Bit set, so this overloading operator is disabled */ 3106 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) ) 3107 return FALSE; 3108 } 3109 return TRUE; 3110 } 3111 3112 SV* 3113 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags) 3114 { 3115 dVAR; 3116 MAGIC *mg; 3117 CV *cv=NULL; 3118 CV **cvp=NULL, **ocvp=NULL; 3119 AMT *amtp=NULL, *oamtp=NULL; 3120 int off = 0, off1, lr = 0, notfound = 0; 3121 int postpr = 0, force_cpy = 0; 3122 int assign = AMGf_assign & flags; 3123 const int assignshift = assign ? 1 : 0; 3124 int use_default_op = 0; 3125 int force_scalar = 0; 3126 #ifdef DEBUGGING 3127 int fl=0; 3128 #endif 3129 HV* stash=NULL; 3130 3131 PERL_ARGS_ASSERT_AMAGIC_CALL; 3132 3133 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) { 3134 if (!amagic_is_enabled(method)) return NULL; 3135 } 3136 3137 if (!(AMGf_noleft & flags) && SvAMAGIC(left) 3138 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash) 3139 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table)) 3140 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) 3141 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table 3142 : NULL)) 3143 && ((cv = cvp[off=method+assignshift]) 3144 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to 3145 * usual method */ 3146 ( 3147 #ifdef DEBUGGING 3148 fl = 1, 3149 #endif 3150 cv = cvp[off=method])))) { 3151 lr = -1; /* Call method for left argument */ 3152 } else { 3153 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) { 3154 int logic; 3155 3156 /* look for substituted methods */ 3157 /* In all the covered cases we should be called with assign==0. */ 3158 switch (method) { 3159 case inc_amg: 3160 force_cpy = 1; 3161 if ((cv = cvp[off=add_ass_amg]) 3162 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) { 3163 right = &PL_sv_yes; lr = -1; assign = 1; 3164 } 3165 break; 3166 case dec_amg: 3167 force_cpy = 1; 3168 if ((cv = cvp[off = subtr_ass_amg]) 3169 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) { 3170 right = &PL_sv_yes; lr = -1; assign = 1; 3171 } 3172 break; 3173 case bool__amg: 3174 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg])); 3175 break; 3176 case numer_amg: 3177 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg])); 3178 break; 3179 case string_amg: 3180 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg])); 3181 break; 3182 case not_amg: 3183 (void)((cv = cvp[off=bool__amg]) 3184 || (cv = cvp[off=numer_amg]) 3185 || (cv = cvp[off=string_amg])); 3186 if (cv) 3187 postpr = 1; 3188 break; 3189 case copy_amg: 3190 { 3191 /* 3192 * SV* ref causes confusion with the interpreter variable of 3193 * the same name 3194 */ 3195 SV* const tmpRef=SvRV(left); 3196 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) { 3197 /* 3198 * Just to be extra cautious. Maybe in some 3199 * additional cases sv_setsv is safe, too. 3200 */ 3201 SV* const newref = newSVsv(tmpRef); 3202 SvOBJECT_on(newref); 3203 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros 3204 delegate to the stash. */ 3205 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef)))); 3206 return newref; 3207 } 3208 } 3209 break; 3210 case abs_amg: 3211 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg]) 3212 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) { 3213 SV* const nullsv=&PL_sv_zero; 3214 if (off1==lt_amg) { 3215 SV* const lessp = amagic_call(left,nullsv, 3216 lt_amg,AMGf_noright); 3217 logic = SvTRUE_NN(lessp); 3218 } else { 3219 SV* const lessp = amagic_call(left,nullsv, 3220 ncmp_amg,AMGf_noright); 3221 logic = (SvNV(lessp) < 0); 3222 } 3223 if (logic) { 3224 if (off==subtr_amg) { 3225 right = left; 3226 left = nullsv; 3227 lr = 1; 3228 } 3229 } else { 3230 return left; 3231 } 3232 } 3233 break; 3234 case neg_amg: 3235 if ((cv = cvp[off=subtr_amg])) { 3236 right = left; 3237 left = &PL_sv_zero; 3238 lr = 1; 3239 } 3240 break; 3241 case int_amg: 3242 case iter_amg: /* XXXX Eventually should do to_gv. */ 3243 case ftest_amg: /* XXXX Eventually should do to_gv. */ 3244 case regexp_amg: 3245 /* FAIL safe */ 3246 return NULL; /* Delegate operation to standard mechanisms. */ 3247 3248 case to_sv_amg: 3249 case to_av_amg: 3250 case to_hv_amg: 3251 case to_gv_amg: 3252 case to_cv_amg: 3253 /* FAIL safe */ 3254 return left; /* Delegate operation to standard mechanisms. */ 3255 3256 default: 3257 goto not_found; 3258 } 3259 if (!cv) goto not_found; 3260 } else if (!(AMGf_noright & flags) && SvAMAGIC(right) 3261 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash) 3262 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table)) 3263 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) 3264 ? (amtp = (AMT*)mg->mg_ptr)->table 3265 : NULL)) 3266 && (cv = cvp[off=method])) { /* Method for right 3267 * argument found */ 3268 lr=1; 3269 } else if (((cvp && amtp->fallback > AMGfallNEVER) 3270 || (ocvp && oamtp->fallback > AMGfallNEVER)) 3271 && !(flags & AMGf_unary)) { 3272 /* We look for substitution for 3273 * comparison operations and 3274 * concatenation */ 3275 if (method==concat_amg || method==concat_ass_amg 3276 || method==repeat_amg || method==repeat_ass_amg) { 3277 return NULL; /* Delegate operation to string conversion */ 3278 } 3279 off = -1; 3280 switch (method) { 3281 case lt_amg: 3282 case le_amg: 3283 case gt_amg: 3284 case ge_amg: 3285 case eq_amg: 3286 case ne_amg: 3287 off = ncmp_amg; 3288 break; 3289 case slt_amg: 3290 case sle_amg: 3291 case sgt_amg: 3292 case sge_amg: 3293 case seq_amg: 3294 case sne_amg: 3295 off = scmp_amg; 3296 break; 3297 } 3298 if (off != -1) { 3299 if (ocvp && (oamtp->fallback > AMGfallNEVER)) { 3300 cv = ocvp[off]; 3301 lr = -1; 3302 } 3303 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) { 3304 cv = cvp[off]; 3305 lr = 1; 3306 } 3307 } 3308 if (cv) 3309 postpr = 1; 3310 else 3311 goto not_found; 3312 } else { 3313 not_found: /* No method found, either report or croak */ 3314 switch (method) { 3315 case to_sv_amg: 3316 case to_av_amg: 3317 case to_hv_amg: 3318 case to_gv_amg: 3319 case to_cv_amg: 3320 /* FAIL safe */ 3321 return left; /* Delegate operation to standard mechanisms. */ 3322 } 3323 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */ 3324 notfound = 1; lr = -1; 3325 } else if (cvp && (cv=cvp[nomethod_amg])) { 3326 notfound = 1; lr = 1; 3327 } else if ((use_default_op = 3328 (!ocvp || oamtp->fallback >= AMGfallYES) 3329 && (!cvp || amtp->fallback >= AMGfallYES)) 3330 && !DEBUG_o_TEST) { 3331 /* Skip generating the "no method found" message. */ 3332 return NULL; 3333 } else { 3334 SV *msg; 3335 if (off==-1) off=method; 3336 msg = sv_2mortal(Perl_newSVpvf(aTHX_ 3337 "Operation \"%s\": no method found,%sargument %s%" SVf "%s%" SVf, 3338 AMG_id2name(method + assignshift), 3339 (flags & AMGf_unary ? " " : "\n\tleft "), 3340 SvAMAGIC(left)? 3341 "in overloaded package ": 3342 "has no overloaded magic", 3343 SvAMAGIC(left)? 3344 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))): 3345 SVfARG(&PL_sv_no), 3346 SvAMAGIC(right)? 3347 ",\n\tright argument in overloaded package ": 3348 (flags & AMGf_unary 3349 ? "" 3350 : ",\n\tright argument has no overloaded magic"), 3351 SvAMAGIC(right)? 3352 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))): 3353 SVfARG(&PL_sv_no))); 3354 if (use_default_op) { 3355 DEBUG_o( Perl_deb(aTHX_ "%" SVf, SVfARG(msg)) ); 3356 } else { 3357 Perl_croak(aTHX_ "%" SVf, SVfARG(msg)); 3358 } 3359 return NULL; 3360 } 3361 force_cpy = force_cpy || assign; 3362 } 3363 } 3364 3365 switch (method) { 3366 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or -- 3367 * operation. we need this to return a value, so that it can be assigned 3368 * later on, in the postpr block (case inc_amg/dec_amg), even if the 3369 * increment or decrement was itself called in void context */ 3370 case inc_amg: 3371 if (off == add_amg) 3372 force_scalar = 1; 3373 break; 3374 case dec_amg: 3375 if (off == subtr_amg) 3376 force_scalar = 1; 3377 break; 3378 /* in these cases, we're calling an assignment variant of an operator 3379 * (+= rather than +, for instance). regardless of whether it's a 3380 * fallback or not, it always has to return a value, which will be 3381 * assigned to the proper variable later */ 3382 case add_amg: 3383 case subtr_amg: 3384 case mult_amg: 3385 case div_amg: 3386 case modulo_amg: 3387 case pow_amg: 3388 case lshift_amg: 3389 case rshift_amg: 3390 case repeat_amg: 3391 case concat_amg: 3392 case band_amg: 3393 case bor_amg: 3394 case bxor_amg: 3395 case sband_amg: 3396 case sbor_amg: 3397 case sbxor_amg: 3398 if (assign) 3399 force_scalar = 1; 3400 break; 3401 /* the copy constructor always needs to return a value */ 3402 case copy_amg: 3403 force_scalar = 1; 3404 break; 3405 /* because of the way these are implemented (they don't perform the 3406 * dereferencing themselves, they return a reference that perl then 3407 * dereferences later), they always have to be in scalar context */ 3408 case to_sv_amg: 3409 case to_av_amg: 3410 case to_hv_amg: 3411 case to_gv_amg: 3412 case to_cv_amg: 3413 force_scalar = 1; 3414 break; 3415 /* these don't have an op of their own; they're triggered by their parent 3416 * op, so the context there isn't meaningful ('$a and foo()' in void 3417 * context still needs to pass scalar context on to $a's bool overload) */ 3418 case bool__amg: 3419 case numer_amg: 3420 case string_amg: 3421 force_scalar = 1; 3422 break; 3423 } 3424 3425 #ifdef DEBUGGING 3426 if (!notfound) { 3427 DEBUG_o(Perl_deb(aTHX_ 3428 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %" SVf "%s\n", 3429 AMG_id2name(off), 3430 method+assignshift==off? "" : 3431 " (initially \"", 3432 method+assignshift==off? "" : 3433 AMG_id2name(method+assignshift), 3434 method+assignshift==off? "" : "\")", 3435 flags & AMGf_unary? "" : 3436 lr==1 ? " for right argument": " for left argument", 3437 flags & AMGf_unary? " for argument" : "", 3438 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)), 3439 fl? ",\n\tassignment variant used": "") ); 3440 } 3441 #endif 3442 /* Since we use shallow copy during assignment, we need 3443 * to dublicate the contents, probably calling user-supplied 3444 * version of copy operator 3445 */ 3446 /* We need to copy in following cases: 3447 * a) Assignment form was called. 3448 * assignshift==1, assign==T, method + 1 == off 3449 * b) Increment or decrement, called directly. 3450 * assignshift==0, assign==0, method + 0 == off 3451 * c) Increment or decrement, translated to assignment add/subtr. 3452 * assignshift==0, assign==T, 3453 * force_cpy == T 3454 * d) Increment or decrement, translated to nomethod. 3455 * assignshift==0, assign==0, 3456 * force_cpy == T 3457 * e) Assignment form translated to nomethod. 3458 * assignshift==1, assign==T, method + 1 != off 3459 * force_cpy == T 3460 */ 3461 /* off is method, method+assignshift, or a result of opcode substitution. 3462 * In the latter case assignshift==0, so only notfound case is important. 3463 */ 3464 if ( (lr == -1) && ( ( (method + assignshift == off) 3465 && (assign || (method == inc_amg) || (method == dec_amg))) 3466 || force_cpy) ) 3467 { 3468 /* newSVsv does not behave as advertised, so we copy missing 3469 * information by hand */ 3470 SV *tmpRef = SvRV(left); 3471 SV *rv_copy; 3472 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) { 3473 SvRV_set(left, rv_copy); 3474 SvSETMAGIC(left); 3475 SvREFCNT_dec_NN(tmpRef); 3476 } 3477 } 3478 3479 { 3480 dSP; 3481 BINOP myop; 3482 SV* res; 3483 const bool oldcatch = CATCH_GET; 3484 I32 oldmark, nret; 3485 /* for multiconcat, we may call overload several times, 3486 * with the context of individual concats being scalar, 3487 * regardless of the overall context of the multiconcat op 3488 */ 3489 U8 gimme = (force_scalar || PL_op->op_type == OP_MULTICONCAT) 3490 ? G_SCALAR : GIMME_V; 3491 3492 CATCH_SET(TRUE); 3493 Zero(&myop, 1, BINOP); 3494 myop.op_last = (OP *) &myop; 3495 myop.op_next = NULL; 3496 myop.op_flags = OPf_STACKED; 3497 3498 switch (gimme) { 3499 case G_VOID: 3500 myop.op_flags |= OPf_WANT_VOID; 3501 break; 3502 case G_ARRAY: 3503 if (flags & AMGf_want_list) { 3504 myop.op_flags |= OPf_WANT_LIST; 3505 break; 3506 } 3507 /* FALLTHROUGH */ 3508 default: 3509 myop.op_flags |= OPf_WANT_SCALAR; 3510 break; 3511 } 3512 3513 PUSHSTACKi(PERLSI_OVERLOAD); 3514 ENTER; 3515 SAVEOP(); 3516 PL_op = (OP *) &myop; 3517 if (PERLDB_SUB && PL_curstash != PL_debstash) 3518 PL_op->op_private |= OPpENTERSUB_DB; 3519 Perl_pp_pushmark(aTHX); 3520 3521 EXTEND(SP, notfound + 5); 3522 PUSHs(lr>0? right: left); 3523 PUSHs(lr>0? left: right); 3524 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no )); 3525 if (notfound) { 3526 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift), 3527 AMG_id2namelen(method + assignshift), SVs_TEMP)); 3528 } 3529 else if (flags & AMGf_numarg) 3530 PUSHs(&PL_sv_undef); 3531 if (flags & AMGf_numarg) 3532 PUSHs(&PL_sv_yes); 3533 PUSHs(MUTABLE_SV(cv)); 3534 PUTBACK; 3535 oldmark = TOPMARK; 3536 3537 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX))) 3538 CALLRUNOPS(aTHX); 3539 LEAVE; 3540 SPAGAIN; 3541 nret = SP - (PL_stack_base + oldmark); 3542 3543 switch (gimme) { 3544 case G_VOID: 3545 /* returning NULL has another meaning, and we check the context 3546 * at the call site too, so this can be differentiated from the 3547 * scalar case */ 3548 res = &PL_sv_undef; 3549 SP = PL_stack_base + oldmark; 3550 break; 3551 case G_ARRAY: 3552 if (flags & AMGf_want_list) { 3553 res = sv_2mortal((SV *)newAV()); 3554 av_extend((AV *)res, nret); 3555 while (nret--) 3556 av_store((AV *)res, nret, POPs); 3557 break; 3558 } 3559 /* FALLTHROUGH */ 3560 default: 3561 res = POPs; 3562 break; 3563 } 3564 3565 PUTBACK; 3566 POPSTACK; 3567 CATCH_SET(oldcatch); 3568 3569 if (postpr) { 3570 int ans; 3571 switch (method) { 3572 case le_amg: 3573 case sle_amg: 3574 ans=SvIV(res)<=0; break; 3575 case lt_amg: 3576 case slt_amg: 3577 ans=SvIV(res)<0; break; 3578 case ge_amg: 3579 case sge_amg: 3580 ans=SvIV(res)>=0; break; 3581 case gt_amg: 3582 case sgt_amg: 3583 ans=SvIV(res)>0; break; 3584 case eq_amg: 3585 case seq_amg: 3586 ans=SvIV(res)==0; break; 3587 case ne_amg: 3588 case sne_amg: 3589 ans=SvIV(res)!=0; break; 3590 case inc_amg: 3591 case dec_amg: 3592 SvSetSV(left,res); return left; 3593 case not_amg: 3594 ans=!SvTRUE_NN(res); break; 3595 default: 3596 ans=0; break; 3597 } 3598 return boolSV(ans); 3599 } else if (method==copy_amg) { 3600 if (!SvROK(res)) { 3601 Perl_croak(aTHX_ "Copy method did not return a reference"); 3602 } 3603 return SvREFCNT_inc(SvRV(res)); 3604 } else { 3605 return res; 3606 } 3607 } 3608 } 3609 3610 void 3611 Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags) 3612 { 3613 dVAR; 3614 U32 hash; 3615 3616 PERL_ARGS_ASSERT_GV_NAME_SET; 3617 3618 if (len > I32_MAX) 3619 Perl_croak(aTHX_ "panic: gv name too long (%" UVuf ")", (UV) len); 3620 3621 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) { 3622 unshare_hek(GvNAME_HEK(gv)); 3623 } 3624 3625 PERL_HASH(hash, name, len); 3626 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash); 3627 } 3628 3629 /* 3630 =for apidoc gv_try_downgrade 3631 3632 If the typeglob C<gv> can be expressed more succinctly, by having 3633 something other than a real GV in its place in the stash, replace it 3634 with the optimised form. Basic requirements for this are that C<gv> 3635 is a real typeglob, is sufficiently ordinary, and is only referenced 3636 from its package. This function is meant to be used when a GV has been 3637 looked up in part to see what was there, causing upgrading, but based 3638 on what was found it turns out that the real GV isn't required after all. 3639 3640 If C<gv> is a completely empty typeglob, it is deleted from the stash. 3641 3642 If C<gv> is a typeglob containing only a sufficiently-ordinary constant 3643 sub, the typeglob is replaced with a scalar-reference placeholder that 3644 more compactly represents the same thing. 3645 3646 =cut 3647 */ 3648 3649 void 3650 Perl_gv_try_downgrade(pTHX_ GV *gv) 3651 { 3652 HV *stash; 3653 CV *cv; 3654 HEK *namehek; 3655 SV **gvp; 3656 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE; 3657 3658 /* XXX Why and where does this leave dangling pointers during global 3659 destruction? */ 3660 if (PL_phase == PERL_PHASE_DESTRUCT) return; 3661 3662 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) && 3663 !SvOBJECT(gv) && !SvREADONLY(gv) && 3664 isGV_with_GP(gv) && GvGP(gv) && 3665 !GvINTRO(gv) && GvREFCNT(gv) == 1 && 3666 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) && 3667 GvEGVx(gv) == gv && (stash = GvSTASH(gv)))) 3668 return; 3669 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv) 3670 return; 3671 if (SvMAGICAL(gv)) { 3672 MAGIC *mg; 3673 /* only backref magic is allowed */ 3674 if (SvGMAGICAL(gv) || SvSMAGICAL(gv)) 3675 return; 3676 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) { 3677 if (mg->mg_type != PERL_MAGIC_backref) 3678 return; 3679 } 3680 } 3681 cv = GvCV(gv); 3682 if (!cv) { 3683 HEK *gvnhek = GvNAME_HEK(gv); 3684 (void)hv_deletehek(stash, gvnhek, G_DISCARD); 3685 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 && 3686 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) && 3687 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv && 3688 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) && 3689 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) && 3690 (namehek = GvNAME_HEK(gv)) && 3691 (gvp = hv_fetchhek(stash, namehek, 0)) && 3692 *gvp == (SV*)gv) { 3693 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr); 3694 const bool imported = !!GvIMPORTED_CV(gv); 3695 SvREFCNT(gv) = 0; 3696 sv_clear((SV*)gv); 3697 SvREFCNT(gv) = 1; 3698 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported; 3699 3700 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */ 3701 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) - 3702 STRUCT_OFFSET(XPVIV, xiv_iv)); 3703 SvRV_set(gv, value); 3704 } 3705 } 3706 3707 GV * 3708 Perl_gv_override(pTHX_ const char * const name, const STRLEN len) 3709 { 3710 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV); 3711 GV * const *gvp; 3712 PERL_ARGS_ASSERT_GV_OVERRIDE; 3713 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv; 3714 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE); 3715 gv = gvp ? *gvp : NULL; 3716 if (gv && !isGV(gv)) { 3717 if (!SvPCS_IMPORTED(gv)) return NULL; 3718 gv_init(gv, PL_globalstash, name, len, 0); 3719 return gv; 3720 } 3721 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL; 3722 } 3723 3724 #include "XSUB.h" 3725 3726 static void 3727 core_xsub(pTHX_ CV* cv) 3728 { 3729 Perl_croak(aTHX_ 3730 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv)) 3731 ); 3732 } 3733 3734 /* 3735 * ex: set ts=8 sts=4 sw=4 et: 3736 */ 3737