| 1 | /* gv.c |
| 2 | * |
| 3 | * Copyright (c) 1991-2001, Larry Wall |
| 4 | * |
| 5 | * You may distribute under the terms of either the GNU General Public |
| 6 | * License or the Artistic License, as specified in the README file. |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure |
| 12 | * of your inquisitiveness, I shall spend all the rest of my days answering |
| 13 | * you. What more do you want to know?' |
| 14 | * 'The names of all the stars, and of all living things, and the whole |
| 15 | * history of Middle-earth and Over-heaven and of the Sundering Seas,' |
| 16 | * laughed Pippin. |
| 17 | */ |
| 18 | |
| 19 | #include "EXTERN.h" |
| 20 | #define PERL_IN_GV_C |
| 21 | #include "perl.h" |
| 22 | |
| 23 | GV * |
| 24 | Perl_gv_AVadd(pTHX_ register GV *gv) |
| 25 | { |
| 26 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) |
| 27 | Perl_croak(aTHX_ "Bad symbol for array"); |
| 28 | if (!GvAV(gv)) |
| 29 | GvAV(gv) = newAV(); |
| 30 | return gv; |
| 31 | } |
| 32 | |
| 33 | GV * |
| 34 | Perl_gv_HVadd(pTHX_ register GV *gv) |
| 35 | { |
| 36 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) |
| 37 | Perl_croak(aTHX_ "Bad symbol for hash"); |
| 38 | if (!GvHV(gv)) |
| 39 | GvHV(gv) = newHV(); |
| 40 | return gv; |
| 41 | } |
| 42 | |
| 43 | GV * |
| 44 | Perl_gv_IOadd(pTHX_ register GV *gv) |
| 45 | { |
| 46 | if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) |
| 47 | Perl_croak(aTHX_ "Bad symbol for filehandle"); |
| 48 | if (!GvIOp(gv)) |
| 49 | GvIOp(gv) = newIO(); |
| 50 | return gv; |
| 51 | } |
| 52 | |
| 53 | GV * |
| 54 | Perl_gv_fetchfile(pTHX_ const char *name) |
| 55 | { |
| 56 | char smallbuf[256]; |
| 57 | char *tmpbuf; |
| 58 | STRLEN tmplen; |
| 59 | GV *gv; |
| 60 | |
| 61 | if (!PL_defstash) |
| 62 | return Nullgv; |
| 63 | |
| 64 | tmplen = strlen(name) + 2; |
| 65 | if (tmplen < sizeof smallbuf) |
| 66 | tmpbuf = smallbuf; |
| 67 | else |
| 68 | New(603, tmpbuf, tmplen + 1, char); |
| 69 | tmpbuf[0] = '_'; |
| 70 | tmpbuf[1] = '<'; |
| 71 | strcpy(tmpbuf + 2, name); |
| 72 | gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE); |
| 73 | if (!isGV(gv)) { |
| 74 | gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE); |
| 75 | sv_setpv(GvSV(gv), name); |
| 76 | if (PERLDB_LINE) |
| 77 | hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, 'L'); |
| 78 | } |
| 79 | if (tmpbuf != smallbuf) |
| 80 | Safefree(tmpbuf); |
| 81 | return gv; |
| 82 | } |
| 83 | |
| 84 | void |
| 85 | Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi) |
| 86 | { |
| 87 | register GP *gp; |
| 88 | bool doproto = SvTYPE(gv) > SVt_NULL; |
| 89 | char *proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL; |
| 90 | |
| 91 | sv_upgrade((SV*)gv, SVt_PVGV); |
| 92 | if (SvLEN(gv)) { |
| 93 | if (proto) { |
| 94 | SvPVX(gv) = NULL; |
| 95 | SvLEN(gv) = 0; |
| 96 | SvPOK_off(gv); |
| 97 | } else |
| 98 | Safefree(SvPVX(gv)); |
| 99 | } |
| 100 | Newz(602, gp, 1, GP); |
| 101 | GvGP(gv) = gp_ref(gp); |
| 102 | GvSV(gv) = NEWSV(72,0); |
| 103 | GvLINE(gv) = CopLINE(PL_curcop); |
| 104 | GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : ""; |
| 105 | GvCVGEN(gv) = 0; |
| 106 | GvEGV(gv) = gv; |
| 107 | sv_magic((SV*)gv, (SV*)gv, '*', Nullch, 0); |
| 108 | GvSTASH(gv) = (HV*)SvREFCNT_inc(stash); |
| 109 | GvNAME(gv) = savepvn(name, len); |
| 110 | GvNAMELEN(gv) = len; |
| 111 | if (multi || doproto) /* doproto means it _was_ mentioned */ |
| 112 | GvMULTI_on(gv); |
| 113 | if (doproto) { /* Replicate part of newSUB here. */ |
| 114 | SvIOK_off(gv); |
| 115 | ENTER; |
| 116 | /* XXX unsafe for threads if eval_owner isn't held */ |
| 117 | start_subparse(0,0); /* Create CV in compcv. */ |
| 118 | GvCV(gv) = PL_compcv; |
| 119 | LEAVE; |
| 120 | |
| 121 | PL_sub_generation++; |
| 122 | CvGV(GvCV(gv)) = (GV*)SvREFCNT_inc(gv); |
| 123 | CvFILE(GvCV(gv)) = CopFILE(PL_curcop); |
| 124 | CvSTASH(GvCV(gv)) = PL_curstash; |
| 125 | #ifdef USE_THREADS |
| 126 | CvOWNER(GvCV(gv)) = 0; |
| 127 | if (!CvMUTEXP(GvCV(gv))) { |
| 128 | New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex); |
| 129 | MUTEX_INIT(CvMUTEXP(GvCV(gv))); |
| 130 | } |
| 131 | #endif /* USE_THREADS */ |
| 132 | if (proto) { |
| 133 | sv_setpv((SV*)GvCV(gv), proto); |
| 134 | Safefree(proto); |
| 135 | } |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | STATIC void |
| 140 | S_gv_init_sv(pTHX_ GV *gv, I32 sv_type) |
| 141 | { |
| 142 | switch (sv_type) { |
| 143 | case SVt_PVIO: |
| 144 | (void)GvIOn(gv); |
| 145 | break; |
| 146 | case SVt_PVAV: |
| 147 | (void)GvAVn(gv); |
| 148 | break; |
| 149 | case SVt_PVHV: |
| 150 | (void)GvHVn(gv); |
| 151 | break; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | =for apidoc gv_fetchmeth |
| 157 | |
| 158 | Returns the glob with the given C<name> and a defined subroutine or |
| 159 | C<NULL>. The glob lives in the given C<stash>, or in the stashes |
| 160 | accessible via @ISA and @UNIVERSAL. |
| 161 | |
| 162 | The argument C<level> should be either 0 or -1. If C<level==0>, as a |
| 163 | side-effect creates a glob with the given C<name> in the given C<stash> |
| 164 | which in the case of success contains an alias for the subroutine, and sets |
| 165 | up caching info for this glob. Similarly for all the searched stashes. |
| 166 | |
| 167 | This function grants C<"SUPER"> token as a postfix of the stash name. The |
| 168 | GV returned from C<gv_fetchmeth> may be a method cache entry, which is not |
| 169 | visible to Perl code. So when calling C<call_sv>, you should not use |
| 170 | the GV directly; instead, you should use the method's CV, which can be |
| 171 | obtained from the GV with the C<GvCV> macro. |
| 172 | |
| 173 | =cut |
| 174 | */ |
| 175 | |
| 176 | GV * |
| 177 | Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level) |
| 178 | { |
| 179 | AV* av; |
| 180 | GV* topgv; |
| 181 | GV* gv; |
| 182 | GV** gvp; |
| 183 | CV* cv; |
| 184 | |
| 185 | if (!stash) |
| 186 | return 0; |
| 187 | if ((level > 100) || (level < -100)) |
| 188 | Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'", |
| 189 | name, HvNAME(stash)); |
| 190 | |
| 191 | DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,HvNAME(stash)) ); |
| 192 | |
| 193 | gvp = (GV**)hv_fetch(stash, name, len, (level >= 0)); |
| 194 | if (!gvp) |
| 195 | topgv = Nullgv; |
| 196 | else { |
| 197 | topgv = *gvp; |
| 198 | if (SvTYPE(topgv) != SVt_PVGV) |
| 199 | gv_init(topgv, stash, name, len, TRUE); |
| 200 | if ((cv = GvCV(topgv))) { |
| 201 | /* If genuine method or valid cache entry, use it */ |
| 202 | if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation) |
| 203 | return topgv; |
| 204 | /* Stale cached entry: junk it */ |
| 205 | SvREFCNT_dec(cv); |
| 206 | GvCV(topgv) = cv = Nullcv; |
| 207 | GvCVGEN(topgv) = 0; |
| 208 | } |
| 209 | else if (GvCVGEN(topgv) == PL_sub_generation) |
| 210 | return 0; /* cache indicates sub doesn't exist */ |
| 211 | } |
| 212 | |
| 213 | gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE); |
| 214 | av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav; |
| 215 | |
| 216 | /* create and re-create @.*::SUPER::ISA on demand */ |
| 217 | if (!av || !SvMAGIC(av)) { |
| 218 | char* packname = HvNAME(stash); |
| 219 | STRLEN packlen = strlen(packname); |
| 220 | |
| 221 | if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) { |
| 222 | HV* basestash; |
| 223 | |
| 224 | packlen -= 7; |
| 225 | basestash = gv_stashpvn(packname, packlen, TRUE); |
| 226 | gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE); |
| 227 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
| 228 | gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE); |
| 229 | if (!gvp || !(gv = *gvp)) |
| 230 | Perl_croak(aTHX_ "Cannot create %s::ISA", HvNAME(stash)); |
| 231 | if (SvTYPE(gv) != SVt_PVGV) |
| 232 | gv_init(gv, stash, "ISA", 3, TRUE); |
| 233 | SvREFCNT_dec(GvAV(gv)); |
| 234 | GvAV(gv) = (AV*)SvREFCNT_inc(av); |
| 235 | } |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | if (av) { |
| 240 | SV** svp = AvARRAY(av); |
| 241 | /* NOTE: No support for tied ISA */ |
| 242 | I32 items = AvFILLp(av) + 1; |
| 243 | while (items--) { |
| 244 | SV* sv = *svp++; |
| 245 | HV* basestash = gv_stashsv(sv, FALSE); |
| 246 | if (!basestash) { |
| 247 | if (ckWARN(WARN_MISC)) |
| 248 | Perl_warner(aTHX_ WARN_MISC, "Can't locate package %s for @%s::ISA", |
| 249 | SvPVX(sv), HvNAME(stash)); |
| 250 | continue; |
| 251 | } |
| 252 | gv = gv_fetchmeth(basestash, name, len, |
| 253 | (level >= 0) ? level + 1 : level - 1); |
| 254 | if (gv) |
| 255 | goto gotcha; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | /* if at top level, try UNIVERSAL */ |
| 260 | |
| 261 | if (level == 0 || level == -1) { |
| 262 | HV* lastchance; |
| 263 | |
| 264 | if ((lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE))) { |
| 265 | if ((gv = gv_fetchmeth(lastchance, name, len, |
| 266 | (level >= 0) ? level + 1 : level - 1))) |
| 267 | { |
| 268 | gotcha: |
| 269 | /* |
| 270 | * Cache method in topgv if: |
| 271 | * 1. topgv has no synonyms (else inheritance crosses wires) |
| 272 | * 2. method isn't a stub (else AUTOLOAD fails spectacularly) |
| 273 | */ |
| 274 | if (topgv && |
| 275 | GvREFCNT(topgv) == 1 && |
| 276 | (cv = GvCV(gv)) && |
| 277 | (CvROOT(cv) || CvXSUB(cv))) |
| 278 | { |
| 279 | if ((cv = GvCV(topgv))) |
| 280 | SvREFCNT_dec(cv); |
| 281 | GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv)); |
| 282 | GvCVGEN(topgv) = PL_sub_generation; |
| 283 | } |
| 284 | return gv; |
| 285 | } |
| 286 | else if (topgv && GvREFCNT(topgv) == 1) { |
| 287 | /* cache the fact that the method is not defined */ |
| 288 | GvCVGEN(topgv) = PL_sub_generation; |
| 289 | } |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | =for apidoc gv_fetchmethod |
| 298 | |
| 299 | See L<gv_fetchmethod_autoload>. |
| 300 | |
| 301 | =cut |
| 302 | */ |
| 303 | |
| 304 | GV * |
| 305 | Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name) |
| 306 | { |
| 307 | return gv_fetchmethod_autoload(stash, name, TRUE); |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | =for apidoc gv_fetchmethod_autoload |
| 312 | |
| 313 | Returns the glob which contains the subroutine to call to invoke the method |
| 314 | on the C<stash>. In fact in the presence of autoloading this may be the |
| 315 | glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is |
| 316 | already setup. |
| 317 | |
| 318 | The third parameter of C<gv_fetchmethod_autoload> determines whether |
| 319 | AUTOLOAD lookup is performed if the given method is not present: non-zero |
| 320 | means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD. |
| 321 | Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload> |
| 322 | with a non-zero C<autoload> parameter. |
| 323 | |
| 324 | These functions grant C<"SUPER"> token as a prefix of the method name. Note |
| 325 | that if you want to keep the returned glob for a long time, you need to |
| 326 | check for it being "AUTOLOAD", since at the later time the call may load a |
| 327 | different subroutine due to $AUTOLOAD changing its value. Use the glob |
| 328 | created via a side effect to do this. |
| 329 | |
| 330 | These functions have the same side-effects and as C<gv_fetchmeth> with |
| 331 | C<level==0>. C<name> should be writable if contains C<':'> or C<' |
| 332 | ''>. The warning against passing the GV returned by C<gv_fetchmeth> to |
| 333 | C<call_sv> apply equally to these functions. |
| 334 | |
| 335 | =cut |
| 336 | */ |
| 337 | |
| 338 | GV * |
| 339 | Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload) |
| 340 | { |
| 341 | register const char *nend; |
| 342 | const char *nsplit = 0; |
| 343 | GV* gv; |
| 344 | |
| 345 | for (nend = name; *nend; nend++) { |
| 346 | if (*nend == '\'') |
| 347 | nsplit = nend; |
| 348 | else if (*nend == ':' && *(nend + 1) == ':') |
| 349 | nsplit = ++nend; |
| 350 | } |
| 351 | if (nsplit) { |
| 352 | const char *origname = name; |
| 353 | name = nsplit + 1; |
| 354 | if (*nsplit == ':') |
| 355 | --nsplit; |
| 356 | if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) { |
| 357 | /* ->SUPER::method should really be looked up in original stash */ |
| 358 | SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER", |
| 359 | CopSTASHPV(PL_curcop))); |
| 360 | stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE); |
| 361 | DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n", |
| 362 | origname, HvNAME(stash), name) ); |
| 363 | } |
| 364 | else |
| 365 | stash = gv_stashpvn(origname, nsplit - origname, TRUE); |
| 366 | } |
| 367 | |
| 368 | gv = gv_fetchmeth(stash, name, nend - name, 0); |
| 369 | if (!gv) { |
| 370 | if (strEQ(name,"import") || strEQ(name,"unimport")) |
| 371 | gv = (GV*)&PL_sv_yes; |
| 372 | else if (autoload) |
| 373 | gv = gv_autoload4(stash, name, nend - name, TRUE); |
| 374 | } |
| 375 | else if (autoload) { |
| 376 | CV* cv = GvCV(gv); |
| 377 | if (!CvROOT(cv) && !CvXSUB(cv)) { |
| 378 | GV* stubgv; |
| 379 | GV* autogv; |
| 380 | |
| 381 | if (CvANON(cv)) |
| 382 | stubgv = gv; |
| 383 | else { |
| 384 | stubgv = CvGV(cv); |
| 385 | if (GvCV(stubgv) != cv) /* orphaned import */ |
| 386 | stubgv = gv; |
| 387 | } |
| 388 | autogv = gv_autoload4(GvSTASH(stubgv), |
| 389 | GvNAME(stubgv), GvNAMELEN(stubgv), TRUE); |
| 390 | if (autogv) |
| 391 | gv = autogv; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | return gv; |
| 396 | } |
| 397 | |
| 398 | GV* |
| 399 | Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method) |
| 400 | { |
| 401 | static char autoload[] = "AUTOLOAD"; |
| 402 | static STRLEN autolen = 8; |
| 403 | GV* gv; |
| 404 | CV* cv; |
| 405 | HV* varstash; |
| 406 | GV* vargv; |
| 407 | SV* varsv; |
| 408 | |
| 409 | if (len == autolen && strnEQ(name, autoload, autolen)) |
| 410 | return Nullgv; |
| 411 | if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE))) |
| 412 | return Nullgv; |
| 413 | cv = GvCV(gv); |
| 414 | |
| 415 | if (!(CvROOT(cv) || CvXSUB(cv))) |
| 416 | return Nullgv; |
| 417 | |
| 418 | /* |
| 419 | * Inheriting AUTOLOAD for non-methods works ... for now. |
| 420 | */ |
| 421 | if (ckWARN(WARN_DEPRECATED) && !method && |
| 422 | (GvCVGEN(gv) || GvSTASH(gv) != stash)) |
| 423 | Perl_warner(aTHX_ WARN_DEPRECATED, |
| 424 | "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated", |
| 425 | HvNAME(stash), (int)len, name); |
| 426 | |
| 427 | #ifndef USE_THREADS |
| 428 | if (CvXSUB(cv)) { |
| 429 | /* rather than lookup/init $AUTOLOAD here |
| 430 | * only to have the XSUB do another lookup for $AUTOLOAD |
| 431 | * and split that value on the last '::', |
| 432 | * pass along the same data via some unused fields in the CV |
| 433 | */ |
| 434 | CvSTASH(cv) = stash; |
| 435 | SvPVX(cv) = (char *)name; /* cast to loose constness warning */ |
| 436 | SvCUR(cv) = len; |
| 437 | return gv; |
| 438 | } |
| 439 | #endif |
| 440 | |
| 441 | /* |
| 442 | * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name. |
| 443 | * The subroutine's original name may not be "AUTOLOAD", so we don't |
| 444 | * use that, but for lack of anything better we will use the sub's |
| 445 | * original package to look up $AUTOLOAD. |
| 446 | */ |
| 447 | varstash = GvSTASH(CvGV(cv)); |
| 448 | vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE); |
| 449 | ENTER; |
| 450 | |
| 451 | #ifdef USE_THREADS |
| 452 | sv_lock((SV *)varstash); |
| 453 | #endif |
| 454 | if (!isGV(vargv)) |
| 455 | gv_init(vargv, varstash, autoload, autolen, FALSE); |
| 456 | LEAVE; |
| 457 | varsv = GvSV(vargv); |
| 458 | #ifdef USE_THREADS |
| 459 | sv_lock(varsv); |
| 460 | #endif |
| 461 | sv_setpv(varsv, HvNAME(stash)); |
| 462 | sv_catpvn(varsv, "::", 2); |
| 463 | sv_catpvn(varsv, name, len); |
| 464 | SvTAINTED_off(varsv); |
| 465 | return gv; |
| 466 | } |
| 467 | |
| 468 | /* |
| 469 | =for apidoc gv_stashpv |
| 470 | |
| 471 | Returns a pointer to the stash for a specified package. C<name> should |
| 472 | be a valid UTF-8 string. If C<create> is set then the package will be |
| 473 | created if it does not already exist. If C<create> is not set and the |
| 474 | package does not exist then NULL is returned. |
| 475 | |
| 476 | =cut |
| 477 | */ |
| 478 | |
| 479 | HV* |
| 480 | Perl_gv_stashpv(pTHX_ const char *name, I32 create) |
| 481 | { |
| 482 | return gv_stashpvn(name, strlen(name), create); |
| 483 | } |
| 484 | |
| 485 | HV* |
| 486 | Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create) |
| 487 | { |
| 488 | char smallbuf[256]; |
| 489 | char *tmpbuf; |
| 490 | HV *stash; |
| 491 | GV *tmpgv; |
| 492 | |
| 493 | if (namelen + 3 < sizeof smallbuf) |
| 494 | tmpbuf = smallbuf; |
| 495 | else |
| 496 | New(606, tmpbuf, namelen + 3, char); |
| 497 | Copy(name,tmpbuf,namelen,char); |
| 498 | tmpbuf[namelen++] = ':'; |
| 499 | tmpbuf[namelen++] = ':'; |
| 500 | tmpbuf[namelen] = '\0'; |
| 501 | tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV); |
| 502 | if (tmpbuf != smallbuf) |
| 503 | Safefree(tmpbuf); |
| 504 | if (!tmpgv) |
| 505 | return 0; |
| 506 | if (!GvHV(tmpgv)) |
| 507 | GvHV(tmpgv) = newHV(); |
| 508 | stash = GvHV(tmpgv); |
| 509 | if (!HvNAME(stash)) |
| 510 | HvNAME(stash) = savepv(name); |
| 511 | return stash; |
| 512 | } |
| 513 | |
| 514 | /* |
| 515 | =for apidoc gv_stashsv |
| 516 | |
| 517 | Returns a pointer to the stash for a specified package, which must be a |
| 518 | valid UTF-8 string. See C<gv_stashpv>. |
| 519 | |
| 520 | =cut |
| 521 | */ |
| 522 | |
| 523 | HV* |
| 524 | Perl_gv_stashsv(pTHX_ SV *sv, I32 create) |
| 525 | { |
| 526 | register char *ptr; |
| 527 | STRLEN len; |
| 528 | ptr = SvPV(sv,len); |
| 529 | return gv_stashpvn(ptr, len, create); |
| 530 | } |
| 531 | |
| 532 | |
| 533 | GV * |
| 534 | Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) |
| 535 | { |
| 536 | register const char *name = nambeg; |
| 537 | register GV *gv = 0; |
| 538 | GV**gvp; |
| 539 | I32 len; |
| 540 | register const char *namend; |
| 541 | HV *stash = 0; |
| 542 | |
| 543 | if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */ |
| 544 | name++; |
| 545 | |
| 546 | for (namend = name; *namend; namend++) { |
| 547 | if ((*namend == ':' && namend[1] == ':') |
| 548 | || (*namend == '\'' && namend[1])) |
| 549 | { |
| 550 | if (!stash) |
| 551 | stash = PL_defstash; |
| 552 | if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */ |
| 553 | return Nullgv; |
| 554 | |
| 555 | len = namend - name; |
| 556 | if (len > 0) { |
| 557 | char smallbuf[256]; |
| 558 | char *tmpbuf; |
| 559 | |
| 560 | if (len + 3 < sizeof smallbuf) |
| 561 | tmpbuf = smallbuf; |
| 562 | else |
| 563 | New(601, tmpbuf, len+3, char); |
| 564 | Copy(name, tmpbuf, len, char); |
| 565 | tmpbuf[len++] = ':'; |
| 566 | tmpbuf[len++] = ':'; |
| 567 | tmpbuf[len] = '\0'; |
| 568 | gvp = (GV**)hv_fetch(stash,tmpbuf,len,add); |
| 569 | gv = gvp ? *gvp : Nullgv; |
| 570 | if (gv && gv != (GV*)&PL_sv_undef) { |
| 571 | if (SvTYPE(gv) != SVt_PVGV) |
| 572 | gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI)); |
| 573 | else |
| 574 | GvMULTI_on(gv); |
| 575 | } |
| 576 | if (tmpbuf != smallbuf) |
| 577 | Safefree(tmpbuf); |
| 578 | if (!gv || gv == (GV*)&PL_sv_undef) |
| 579 | return Nullgv; |
| 580 | |
| 581 | if (!(stash = GvHV(gv))) |
| 582 | stash = GvHV(gv) = newHV(); |
| 583 | |
| 584 | if (!HvNAME(stash)) |
| 585 | HvNAME(stash) = savepvn(nambeg, namend - nambeg); |
| 586 | } |
| 587 | |
| 588 | if (*namend == ':') |
| 589 | namend++; |
| 590 | namend++; |
| 591 | name = namend; |
| 592 | if (!*name) |
| 593 | return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE); |
| 594 | } |
| 595 | } |
| 596 | len = namend - name; |
| 597 | if (!len) |
| 598 | len = 1; |
| 599 | |
| 600 | /* No stash in name, so see how we can default */ |
| 601 | |
| 602 | if (!stash) { |
| 603 | if (isIDFIRST_lazy(name)) { |
| 604 | bool global = FALSE; |
| 605 | |
| 606 | if (isUPPER(*name)) { |
| 607 | if (*name == 'S' && ( |
| 608 | strEQ(name, "SIG") || |
| 609 | strEQ(name, "STDIN") || |
| 610 | strEQ(name, "STDOUT") || |
| 611 | strEQ(name, "STDERR"))) |
| 612 | global = TRUE; |
| 613 | else if (*name == 'I' && strEQ(name, "INC")) |
| 614 | global = TRUE; |
| 615 | else if (*name == 'E' && strEQ(name, "ENV")) |
| 616 | global = TRUE; |
| 617 | else if (*name == 'A' && ( |
| 618 | strEQ(name, "ARGV") || |
| 619 | strEQ(name, "ARGVOUT"))) |
| 620 | global = TRUE; |
| 621 | } |
| 622 | else if (*name == '_' && !name[1]) |
| 623 | global = TRUE; |
| 624 | |
| 625 | if (global) |
| 626 | stash = PL_defstash; |
| 627 | else if ((COP*)PL_curcop == &PL_compiling) { |
| 628 | stash = PL_curstash; |
| 629 | if (add && (PL_hints & HINT_STRICT_VARS) && |
| 630 | sv_type != SVt_PVCV && |
| 631 | sv_type != SVt_PVGV && |
| 632 | sv_type != SVt_PVFM && |
| 633 | sv_type != SVt_PVIO && |
| 634 | !(len == 1 && sv_type == SVt_PV && strchr("ab",*name)) ) |
| 635 | { |
| 636 | gvp = (GV**)hv_fetch(stash,name,len,0); |
| 637 | if (!gvp || |
| 638 | *gvp == (GV*)&PL_sv_undef || |
| 639 | SvTYPE(*gvp) != SVt_PVGV) |
| 640 | { |
| 641 | stash = 0; |
| 642 | } |
| 643 | else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) || |
| 644 | (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) || |
| 645 | (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) ) |
| 646 | { |
| 647 | Perl_warn(aTHX_ "Variable \"%c%s\" is not imported", |
| 648 | sv_type == SVt_PVAV ? '@' : |
| 649 | sv_type == SVt_PVHV ? '%' : '$', |
| 650 | name); |
| 651 | if (GvCVu(*gvp)) |
| 652 | Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name); |
| 653 | stash = 0; |
| 654 | } |
| 655 | } |
| 656 | } |
| 657 | else |
| 658 | stash = CopSTASH(PL_curcop); |
| 659 | } |
| 660 | else |
| 661 | stash = PL_defstash; |
| 662 | } |
| 663 | |
| 664 | /* By this point we should have a stash and a name */ |
| 665 | |
| 666 | if (!stash) { |
| 667 | if (add) { |
| 668 | qerror(Perl_mess(aTHX_ |
| 669 | "Global symbol \"%s%s\" requires explicit package name", |
| 670 | (sv_type == SVt_PV ? "$" |
| 671 | : sv_type == SVt_PVAV ? "@" |
| 672 | : sv_type == SVt_PVHV ? "%" |
| 673 | : ""), name)); |
| 674 | stash = PL_nullstash; |
| 675 | } |
| 676 | else |
| 677 | return Nullgv; |
| 678 | } |
| 679 | |
| 680 | if (!SvREFCNT(stash)) /* symbol table under destruction */ |
| 681 | return Nullgv; |
| 682 | |
| 683 | gvp = (GV**)hv_fetch(stash,name,len,add); |
| 684 | if (!gvp || *gvp == (GV*)&PL_sv_undef) |
| 685 | return Nullgv; |
| 686 | gv = *gvp; |
| 687 | if (SvTYPE(gv) == SVt_PVGV) { |
| 688 | if (add) { |
| 689 | GvMULTI_on(gv); |
| 690 | gv_init_sv(gv, sv_type); |
| 691 | } |
| 692 | return gv; |
| 693 | } else if (add & GV_NOINIT) { |
| 694 | return gv; |
| 695 | } |
| 696 | |
| 697 | /* Adding a new symbol */ |
| 698 | |
| 699 | if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL)) |
| 700 | Perl_warner(aTHX_ WARN_INTERNAL, "Had to create %s unexpectedly", nambeg); |
| 701 | gv_init(gv, stash, name, len, add & GV_ADDMULTI); |
| 702 | gv_init_sv(gv, sv_type); |
| 703 | |
| 704 | if (isLEXWARN_on && isALPHA(name[0]) && ! ckWARN(WARN_ONCE)) |
| 705 | GvMULTI_on(gv) ; |
| 706 | |
| 707 | /* set up magic where warranted */ |
| 708 | switch (*name) { |
| 709 | case 'A': |
| 710 | if (strEQ(name, "ARGV")) { |
| 711 | IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START; |
| 712 | } |
| 713 | break; |
| 714 | case 'E': |
| 715 | if (strnEQ(name, "EXPORT", 6)) |
| 716 | GvMULTI_on(gv); |
| 717 | break; |
| 718 | case 'I': |
| 719 | if (strEQ(name, "ISA")) { |
| 720 | AV* av = GvAVn(gv); |
| 721 | GvMULTI_on(gv); |
| 722 | sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0); |
| 723 | /* NOTE: No support for tied ISA */ |
| 724 | if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA") |
| 725 | && AvFILLp(av) == -1) |
| 726 | { |
| 727 | char *pname; |
| 728 | av_push(av, newSVpvn(pname = "NDBM_File",9)); |
| 729 | gv_stashpvn(pname, 9, TRUE); |
| 730 | av_push(av, newSVpvn(pname = "DB_File",7)); |
| 731 | gv_stashpvn(pname, 7, TRUE); |
| 732 | av_push(av, newSVpvn(pname = "GDBM_File",9)); |
| 733 | gv_stashpvn(pname, 9, TRUE); |
| 734 | av_push(av, newSVpvn(pname = "SDBM_File",9)); |
| 735 | gv_stashpvn(pname, 9, TRUE); |
| 736 | av_push(av, newSVpvn(pname = "ODBM_File",9)); |
| 737 | gv_stashpvn(pname, 9, TRUE); |
| 738 | } |
| 739 | } |
| 740 | break; |
| 741 | case 'O': |
| 742 | if (strEQ(name, "OVERLOAD")) { |
| 743 | HV* hv = GvHVn(gv); |
| 744 | GvMULTI_on(gv); |
| 745 | hv_magic(hv, Nullgv, 'A'); |
| 746 | } |
| 747 | break; |
| 748 | case 'S': |
| 749 | if (strEQ(name, "SIG")) { |
| 750 | HV *hv; |
| 751 | I32 i; |
| 752 | if (!PL_psig_ptr) { |
| 753 | int sig_num[] = { SIG_NUM }; |
| 754 | New(73, PL_psig_ptr, sizeof(sig_num)/sizeof(*sig_num), SV*); |
| 755 | New(73, PL_psig_name, sizeof(sig_num)/sizeof(*sig_num), SV*); |
| 756 | } |
| 757 | GvMULTI_on(gv); |
| 758 | hv = GvHVn(gv); |
| 759 | hv_magic(hv, Nullgv, 'S'); |
| 760 | for (i = 1; PL_sig_name[i]; i++) { |
| 761 | SV ** init; |
| 762 | init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1); |
| 763 | if (init) |
| 764 | sv_setsv(*init, &PL_sv_undef); |
| 765 | PL_psig_ptr[i] = 0; |
| 766 | PL_psig_name[i] = 0; |
| 767 | } |
| 768 | } |
| 769 | break; |
| 770 | case 'V': |
| 771 | if (strEQ(name, "VERSION")) |
| 772 | GvMULTI_on(gv); |
| 773 | break; |
| 774 | |
| 775 | case '&': |
| 776 | if (len > 1) |
| 777 | break; |
| 778 | PL_sawampersand = TRUE; |
| 779 | goto ro_magicalize; |
| 780 | |
| 781 | case '`': |
| 782 | if (len > 1) |
| 783 | break; |
| 784 | PL_sawampersand = TRUE; |
| 785 | goto ro_magicalize; |
| 786 | |
| 787 | case '\'': |
| 788 | if (len > 1) |
| 789 | break; |
| 790 | PL_sawampersand = TRUE; |
| 791 | goto ro_magicalize; |
| 792 | |
| 793 | case ':': |
| 794 | if (len > 1) |
| 795 | break; |
| 796 | sv_setpv(GvSV(gv),PL_chopset); |
| 797 | goto magicalize; |
| 798 | |
| 799 | case '?': |
| 800 | if (len > 1) |
| 801 | break; |
| 802 | #ifdef COMPLEX_STATUS |
| 803 | (void)SvUPGRADE(GvSV(gv), SVt_PVLV); |
| 804 | #endif |
| 805 | goto magicalize; |
| 806 | |
| 807 | case '!': |
| 808 | if (len > 1) |
| 809 | break; |
| 810 | if (sv_type > SVt_PV && PL_curcop != &PL_compiling) { |
| 811 | HV* stash = gv_stashpvn("Errno",5,FALSE); |
| 812 | if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) { |
| 813 | dSP; |
| 814 | PUTBACK; |
| 815 | require_pv("Errno.pm"); |
| 816 | SPAGAIN; |
| 817 | stash = gv_stashpvn("Errno",5,FALSE); |
| 818 | if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) |
| 819 | Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available"); |
| 820 | } |
| 821 | } |
| 822 | goto magicalize; |
| 823 | case '-': |
| 824 | if (len > 1) |
| 825 | break; |
| 826 | else { |
| 827 | AV* av = GvAVn(gv); |
| 828 | sv_magic((SV*)av, Nullsv, 'D', Nullch, 0); |
| 829 | SvREADONLY_on(av); |
| 830 | } |
| 831 | goto magicalize; |
| 832 | case '#': |
| 833 | case '*': |
| 834 | if (ckWARN(WARN_DEPRECATED) && len == 1 && sv_type == SVt_PV) |
| 835 | Perl_warner(aTHX_ WARN_DEPRECATED, "Use of $%s is deprecated", name); |
| 836 | /* FALL THROUGH */ |
| 837 | case '[': |
| 838 | case '^': |
| 839 | case '~': |
| 840 | case '=': |
| 841 | case '%': |
| 842 | case '.': |
| 843 | case '(': |
| 844 | case ')': |
| 845 | case '<': |
| 846 | case '>': |
| 847 | case ',': |
| 848 | case '\\': |
| 849 | case '/': |
| 850 | case '\001': /* $^A */ |
| 851 | case '\003': /* $^C */ |
| 852 | case '\004': /* $^D */ |
| 853 | case '\005': /* $^E */ |
| 854 | case '\006': /* $^F */ |
| 855 | case '\010': /* $^H */ |
| 856 | case '\011': /* $^I, NOT \t in EBCDIC */ |
| 857 | case '\020': /* $^P */ |
| 858 | case '\024': /* $^T */ |
| 859 | if (len > 1) |
| 860 | break; |
| 861 | goto magicalize; |
| 862 | case '|': |
| 863 | if (len > 1) |
| 864 | break; |
| 865 | sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0); |
| 866 | goto magicalize; |
| 867 | case '\017': /* $^O & $^OPEN */ |
| 868 | if (len > 1 && strNE(name, "\017PEN")) |
| 869 | break; |
| 870 | goto magicalize; |
| 871 | case '\023': /* $^S */ |
| 872 | if (len > 1) |
| 873 | break; |
| 874 | goto ro_magicalize; |
| 875 | case '\027': /* $^W & $^WARNING_BITS */ |
| 876 | if (len > 1 && strNE(name, "\027ARNING_BITS") |
| 877 | && strNE(name, "\027IDE_SYSTEM_CALLS")) |
| 878 | break; |
| 879 | goto magicalize; |
| 880 | |
| 881 | case '+': |
| 882 | if (len > 1) |
| 883 | break; |
| 884 | else { |
| 885 | AV* av = GvAVn(gv); |
| 886 | sv_magic((SV*)av, (SV*)av, 'D', Nullch, 0); |
| 887 | SvREADONLY_on(av); |
| 888 | } |
| 889 | /* FALL THROUGH */ |
| 890 | case '1': |
| 891 | case '2': |
| 892 | case '3': |
| 893 | case '4': |
| 894 | case '5': |
| 895 | case '6': |
| 896 | case '7': |
| 897 | case '8': |
| 898 | case '9': |
| 899 | ro_magicalize: |
| 900 | SvREADONLY_on(GvSV(gv)); |
| 901 | magicalize: |
| 902 | sv_magic(GvSV(gv), (SV*)gv, 0, name, len); |
| 903 | break; |
| 904 | |
| 905 | case '\014': /* $^L */ |
| 906 | if (len > 1) |
| 907 | break; |
| 908 | sv_setpv(GvSV(gv),"\f"); |
| 909 | PL_formfeed = GvSV(gv); |
| 910 | break; |
| 911 | case ';': |
| 912 | if (len > 1) |
| 913 | break; |
| 914 | sv_setpv(GvSV(gv),"\034"); |
| 915 | break; |
| 916 | case ']': |
| 917 | if (len == 1) { |
| 918 | SV *sv = GvSV(gv); |
| 919 | (void)SvUPGRADE(sv, SVt_PVNV); |
| 920 | Perl_sv_setpvf(aTHX_ sv, |
| 921 | #if defined(PERL_SUBVERSION) && (PERL_SUBVERSION > 0) |
| 922 | "%8.6" |
| 923 | #else |
| 924 | "%5.3" |
| 925 | #endif |
| 926 | NVff, |
| 927 | SvNVX(PL_patchlevel)); |
| 928 | SvNVX(sv) = SvNVX(PL_patchlevel); |
| 929 | SvNOK_on(sv); |
| 930 | SvREADONLY_on(sv); |
| 931 | } |
| 932 | break; |
| 933 | case '\026': /* $^V */ |
| 934 | if (len == 1) { |
| 935 | SV *sv = GvSV(gv); |
| 936 | GvSV(gv) = SvREFCNT_inc(PL_patchlevel); |
| 937 | SvREFCNT_dec(sv); |
| 938 | } |
| 939 | break; |
| 940 | } |
| 941 | return gv; |
| 942 | } |
| 943 | |
| 944 | void |
| 945 | Perl_gv_fullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain) |
| 946 | { |
| 947 | HV *hv = GvSTASH(gv); |
| 948 | if (!hv) { |
| 949 | (void)SvOK_off(sv); |
| 950 | return; |
| 951 | } |
| 952 | sv_setpv(sv, prefix ? prefix : ""); |
| 953 | if (keepmain || strNE(HvNAME(hv), "main")) { |
| 954 | sv_catpv(sv,HvNAME(hv)); |
| 955 | sv_catpvn(sv,"::", 2); |
| 956 | } |
| 957 | sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv)); |
| 958 | } |
| 959 | |
| 960 | void |
| 961 | Perl_gv_fullname3(pTHX_ SV *sv, GV *gv, const char *prefix) |
| 962 | { |
| 963 | HV *hv = GvSTASH(gv); |
| 964 | if (!hv) { |
| 965 | (void)SvOK_off(sv); |
| 966 | return; |
| 967 | } |
| 968 | sv_setpv(sv, prefix ? prefix : ""); |
| 969 | sv_catpv(sv,HvNAME(hv)); |
| 970 | sv_catpvn(sv,"::", 2); |
| 971 | sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv)); |
| 972 | } |
| 973 | |
| 974 | void |
| 975 | Perl_gv_efullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain) |
| 976 | { |
| 977 | GV *egv = GvEGV(gv); |
| 978 | if (!egv) |
| 979 | egv = gv; |
| 980 | gv_fullname4(sv, egv, prefix, keepmain); |
| 981 | } |
| 982 | |
| 983 | void |
| 984 | Perl_gv_efullname3(pTHX_ SV *sv, GV *gv, const char *prefix) |
| 985 | { |
| 986 | GV *egv = GvEGV(gv); |
| 987 | if (!egv) |
| 988 | egv = gv; |
| 989 | gv_fullname3(sv, egv, prefix); |
| 990 | } |
| 991 | |
| 992 | /* XXX compatibility with versions <= 5.003. */ |
| 993 | void |
| 994 | Perl_gv_fullname(pTHX_ SV *sv, GV *gv) |
| 995 | { |
| 996 | gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : ""); |
| 997 | } |
| 998 | |
| 999 | /* XXX compatibility with versions <= 5.003. */ |
| 1000 | void |
| 1001 | Perl_gv_efullname(pTHX_ SV *sv, GV *gv) |
| 1002 | { |
| 1003 | gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : ""); |
| 1004 | } |
| 1005 | |
| 1006 | IO * |
| 1007 | Perl_newIO(pTHX) |
| 1008 | { |
| 1009 | IO *io; |
| 1010 | GV *iogv; |
| 1011 | |
| 1012 | io = (IO*)NEWSV(0,0); |
| 1013 | sv_upgrade((SV *)io,SVt_PVIO); |
| 1014 | SvREFCNT(io) = 1; |
| 1015 | SvOBJECT_on(io); |
| 1016 | iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV); |
| 1017 | /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */ |
| 1018 | if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv)))) |
| 1019 | iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV); |
| 1020 | SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv)); |
| 1021 | return io; |
| 1022 | } |
| 1023 | |
| 1024 | void |
| 1025 | Perl_gv_check(pTHX_ HV *stash) |
| 1026 | { |
| 1027 | register HE *entry; |
| 1028 | register I32 i; |
| 1029 | register GV *gv; |
| 1030 | HV *hv; |
| 1031 | |
| 1032 | if (!HvARRAY(stash)) |
| 1033 | return; |
| 1034 | for (i = 0; i <= (I32) HvMAX(stash); i++) { |
| 1035 | for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) { |
| 1036 | if (HeKEY(entry)[HeKLEN(entry)-1] == ':' && |
| 1037 | (gv = (GV*)HeVAL(entry)) && (hv = GvHV(gv)) && HvNAME(hv)) |
| 1038 | { |
| 1039 | if (hv != PL_defstash && hv != stash) |
| 1040 | gv_check(hv); /* nested package */ |
| 1041 | } |
| 1042 | else if (isALPHA(*HeKEY(entry))) { |
| 1043 | char *file; |
| 1044 | gv = (GV*)HeVAL(entry); |
| 1045 | if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv)) |
| 1046 | continue; |
| 1047 | file = GvFILE(gv); |
| 1048 | /* performance hack: if filename is absolute and it's a standard |
| 1049 | * module, don't bother warning */ |
| 1050 | if (file |
| 1051 | && PERL_FILE_IS_ABSOLUTE(file) |
| 1052 | && (instr(file, "/lib/") || instr(file, ".pm"))) |
| 1053 | { |
| 1054 | continue; |
| 1055 | } |
| 1056 | CopLINE_set(PL_curcop, GvLINE(gv)); |
| 1057 | #ifdef USE_ITHREADS |
| 1058 | CopFILE(PL_curcop) = file; /* set for warning */ |
| 1059 | #else |
| 1060 | CopFILEGV(PL_curcop) = gv_fetchfile(file); |
| 1061 | #endif |
| 1062 | Perl_warner(aTHX_ WARN_ONCE, |
| 1063 | "Name \"%s::%s\" used only once: possible typo", |
| 1064 | HvNAME(stash), GvNAME(gv)); |
| 1065 | } |
| 1066 | } |
| 1067 | } |
| 1068 | } |
| 1069 | |
| 1070 | GV * |
| 1071 | Perl_newGVgen(pTHX_ char *pack) |
| 1072 | { |
| 1073 | return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++), |
| 1074 | TRUE, SVt_PVGV); |
| 1075 | } |
| 1076 | |
| 1077 | /* hopefully this is only called on local symbol table entries */ |
| 1078 | |
| 1079 | GP* |
| 1080 | Perl_gp_ref(pTHX_ GP *gp) |
| 1081 | { |
| 1082 | if (!gp) |
| 1083 | return (GP*)NULL; |
| 1084 | gp->gp_refcnt++; |
| 1085 | if (gp->gp_cv) { |
| 1086 | if (gp->gp_cvgen) { |
| 1087 | /* multi-named GPs cannot be used for method cache */ |
| 1088 | SvREFCNT_dec(gp->gp_cv); |
| 1089 | gp->gp_cv = Nullcv; |
| 1090 | gp->gp_cvgen = 0; |
| 1091 | } |
| 1092 | else { |
| 1093 | /* Adding a new name to a subroutine invalidates method cache */ |
| 1094 | PL_sub_generation++; |
| 1095 | } |
| 1096 | } |
| 1097 | return gp; |
| 1098 | } |
| 1099 | |
| 1100 | void |
| 1101 | Perl_gp_free(pTHX_ GV *gv) |
| 1102 | { |
| 1103 | GP* gp; |
| 1104 | |
| 1105 | if (!gv || !(gp = GvGP(gv))) |
| 1106 | return; |
| 1107 | if (gp->gp_refcnt == 0) { |
| 1108 | if (ckWARN_d(WARN_INTERNAL)) |
| 1109 | Perl_warner(aTHX_ WARN_INTERNAL, |
| 1110 | "Attempt to free unreferenced glob pointers"); |
| 1111 | return; |
| 1112 | } |
| 1113 | if (gp->gp_cv) { |
| 1114 | /* Deleting the name of a subroutine invalidates method cache */ |
| 1115 | PL_sub_generation++; |
| 1116 | } |
| 1117 | if (--gp->gp_refcnt > 0) { |
| 1118 | if (gp->gp_egv == gv) |
| 1119 | gp->gp_egv = 0; |
| 1120 | return; |
| 1121 | } |
| 1122 | |
| 1123 | SvREFCNT_dec(gp->gp_sv); |
| 1124 | SvREFCNT_dec(gp->gp_av); |
| 1125 | SvREFCNT_dec(gp->gp_hv); |
| 1126 | SvREFCNT_dec(gp->gp_io); |
| 1127 | SvREFCNT_dec(gp->gp_cv); |
| 1128 | SvREFCNT_dec(gp->gp_form); |
| 1129 | |
| 1130 | Safefree(gp); |
| 1131 | GvGP(gv) = 0; |
| 1132 | } |
| 1133 | |
| 1134 | #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286)) |
| 1135 | #define MICROPORT |
| 1136 | #endif |
| 1137 | |
| 1138 | #ifdef MICROPORT /* Microport 2.4 hack */ |
| 1139 | AV *GvAVn(gv) |
| 1140 | register GV *gv; |
| 1141 | { |
| 1142 | if (GvGP(gv)->gp_av) |
| 1143 | return GvGP(gv)->gp_av; |
| 1144 | else |
| 1145 | return GvGP(gv_AVadd(gv))->gp_av; |
| 1146 | } |
| 1147 | |
| 1148 | HV *GvHVn(gv) |
| 1149 | register GV *gv; |
| 1150 | { |
| 1151 | if (GvGP(gv)->gp_hv) |
| 1152 | return GvGP(gv)->gp_hv; |
| 1153 | else |
| 1154 | return GvGP(gv_HVadd(gv))->gp_hv; |
| 1155 | } |
| 1156 | #endif /* Microport 2.4 hack */ |
| 1157 | |
| 1158 | int |
| 1159 | Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg) |
| 1160 | { |
| 1161 | AMT *amtp = (AMT*)mg->mg_ptr; |
| 1162 | if (amtp && AMT_AMAGIC(amtp)) { |
| 1163 | int i; |
| 1164 | for (i = 1; i < NofAMmeth; i++) { |
| 1165 | CV *cv = amtp->table[i]; |
| 1166 | if (cv != Nullcv) { |
| 1167 | SvREFCNT_dec((SV *) cv); |
| 1168 | amtp->table[i] = Nullcv; |
| 1169 | } |
| 1170 | } |
| 1171 | } |
| 1172 | return 0; |
| 1173 | } |
| 1174 | |
| 1175 | /* Updates and caches the CV's */ |
| 1176 | |
| 1177 | bool |
| 1178 | Perl_Gv_AMupdate(pTHX_ HV *stash) |
| 1179 | { |
| 1180 | GV* gv; |
| 1181 | CV* cv; |
| 1182 | MAGIC* mg=mg_find((SV*)stash,'c'); |
| 1183 | AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL; |
| 1184 | AMT amt; |
| 1185 | STRLEN n_a; |
| 1186 | |
| 1187 | if (mg && amtp->was_ok_am == PL_amagic_generation |
| 1188 | && amtp->was_ok_sub == PL_sub_generation) |
| 1189 | return AMT_OVERLOADED(amtp); |
| 1190 | sv_unmagic((SV*)stash, 'c'); |
| 1191 | |
| 1192 | DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME(stash)) ); |
| 1193 | |
| 1194 | Zero(&amt,1,AMT); |
| 1195 | amt.was_ok_am = PL_amagic_generation; |
| 1196 | amt.was_ok_sub = PL_sub_generation; |
| 1197 | amt.fallback = AMGfallNO; |
| 1198 | amt.flags = 0; |
| 1199 | |
| 1200 | { |
| 1201 | int filled = 0, have_ovl = 0; |
| 1202 | int i, lim = 1; |
| 1203 | const char *cp; |
| 1204 | SV* sv = NULL; |
| 1205 | |
| 1206 | /* Work with "fallback" key, which we assume to be first in PL_AMG_names */ |
| 1207 | |
| 1208 | /* Try to find via inheritance. */ |
| 1209 | gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1); |
| 1210 | if (gv) |
| 1211 | sv = GvSV(gv); |
| 1212 | |
| 1213 | if (!gv) |
| 1214 | lim = DESTROY_amg; /* Skip overloading entries. */ |
| 1215 | else if (SvTRUE(sv)) |
| 1216 | amt.fallback=AMGfallYES; |
| 1217 | else if (SvOK(sv)) |
| 1218 | amt.fallback=AMGfallNEVER; |
| 1219 | |
| 1220 | for (i = 1; i < lim; i++) |
| 1221 | amt.table[i] = Nullcv; |
| 1222 | for (; i < NofAMmeth; i++) { |
| 1223 | char *cooky = (char*)PL_AMG_names[i]; |
| 1224 | /* Human-readable form, for debugging: */ |
| 1225 | char *cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i)); |
| 1226 | STRLEN l = strlen(cooky); |
| 1227 | |
| 1228 | DEBUG_o( Perl_deb(aTHX_ "Checking overloading of `%s' in package `%.256s'\n", |
| 1229 | cp, HvNAME(stash)) ); |
| 1230 | /* don't fill the cache while looking up! */ |
| 1231 | gv = gv_fetchmeth(stash, cooky, l, -1); |
| 1232 | cv = 0; |
| 1233 | if (gv && (cv = GvCV(gv))) { |
| 1234 | if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil") |
| 1235 | && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) { |
| 1236 | /* GvSV contains the name of the method. */ |
| 1237 | GV *ngv; |
| 1238 | |
| 1239 | DEBUG_o( Perl_deb(aTHX_ "Resolving method `%.256s' for overloaded `%s' in package `%.256s'\n", |
| 1240 | SvPV(GvSV(gv), n_a), cp, HvNAME(stash)) ); |
| 1241 | if (!SvPOK(GvSV(gv)) |
| 1242 | || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)), |
| 1243 | FALSE))) |
| 1244 | { |
| 1245 | /* Can be an import stub (created by `can'). */ |
| 1246 | if (GvCVGEN(gv)) { |
| 1247 | Perl_croak(aTHX_ "Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'", |
| 1248 | (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ), |
| 1249 | cp, HvNAME(stash)); |
| 1250 | } else |
| 1251 | Perl_croak(aTHX_ "Can't resolve method `%.256s' overloading `%s' in package `%.256s'", |
| 1252 | (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ), |
| 1253 | cp, HvNAME(stash)); |
| 1254 | } |
| 1255 | cv = GvCV(gv = ngv); |
| 1256 | } |
| 1257 | DEBUG_o( Perl_deb(aTHX_ "Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n", |
| 1258 | cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))), |
| 1259 | GvNAME(CvGV(cv))) ); |
| 1260 | filled = 1; |
| 1261 | if (i < DESTROY_amg) |
| 1262 | have_ovl = 1; |
| 1263 | } |
| 1264 | amt.table[i]=(CV*)SvREFCNT_inc(cv); |
| 1265 | } |
| 1266 | if (filled) { |
| 1267 | AMT_AMAGIC_on(&amt); |
| 1268 | if (have_ovl) |
| 1269 | AMT_OVERLOADED_on(&amt); |
| 1270 | sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMT)); |
| 1271 | return have_ovl; |
| 1272 | } |
| 1273 | } |
| 1274 | /* Here we have no table: */ |
| 1275 | no_table: |
| 1276 | AMT_AMAGIC_off(&amt); |
| 1277 | sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMTS)); |
| 1278 | return FALSE; |
| 1279 | } |
| 1280 | |
| 1281 | |
| 1282 | CV* |
| 1283 | Perl_gv_handler(pTHX_ HV *stash, I32 id) |
| 1284 | { |
| 1285 | dTHR; |
| 1286 | MAGIC *mg; |
| 1287 | AMT *amtp; |
| 1288 | |
| 1289 | if (!stash) |
| 1290 | return Nullcv; |
| 1291 | mg = mg_find((SV*)stash,'c'); |
| 1292 | if (!mg) { |
| 1293 | do_update: |
| 1294 | Gv_AMupdate(stash); |
| 1295 | mg = mg_find((SV*)stash,'c'); |
| 1296 | } |
| 1297 | amtp = (AMT*)mg->mg_ptr; |
| 1298 | if ( amtp->was_ok_am != PL_amagic_generation |
| 1299 | || amtp->was_ok_sub != PL_sub_generation ) |
| 1300 | goto do_update; |
| 1301 | if (AMT_AMAGIC(amtp)) |
| 1302 | return amtp->table[id]; |
| 1303 | return Nullcv; |
| 1304 | } |
| 1305 | |
| 1306 | |
| 1307 | SV* |
| 1308 | Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags) |
| 1309 | { |
| 1310 | MAGIC *mg; |
| 1311 | CV *cv; |
| 1312 | CV **cvp=NULL, **ocvp=NULL; |
| 1313 | AMT *amtp, *oamtp; |
| 1314 | int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0; |
| 1315 | int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0; |
| 1316 | HV* stash; |
| 1317 | if (!(AMGf_noleft & flags) && SvAMAGIC(left) |
| 1318 | && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c')) |
| 1319 | && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) |
| 1320 | ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table |
| 1321 | : (CV **) NULL)) |
| 1322 | && ((cv = cvp[off=method+assignshift]) |
| 1323 | || (assign && amtp->fallback > AMGfallNEVER && /* fallback to |
| 1324 | * usual method */ |
| 1325 | (fl = 1, cv = cvp[off=method])))) { |
| 1326 | lr = -1; /* Call method for left argument */ |
| 1327 | } else { |
| 1328 | if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) { |
| 1329 | int logic; |
| 1330 | |
| 1331 | /* look for substituted methods */ |
| 1332 | /* In all the covered cases we should be called with assign==0. */ |
| 1333 | switch (method) { |
| 1334 | case inc_amg: |
| 1335 | force_cpy = 1; |
| 1336 | if ((cv = cvp[off=add_ass_amg]) |
| 1337 | || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) { |
| 1338 | right = &PL_sv_yes; lr = -1; assign = 1; |
| 1339 | } |
| 1340 | break; |
| 1341 | case dec_amg: |
| 1342 | force_cpy = 1; |
| 1343 | if ((cv = cvp[off = subtr_ass_amg]) |
| 1344 | || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) { |
| 1345 | right = &PL_sv_yes; lr = -1; assign = 1; |
| 1346 | } |
| 1347 | break; |
| 1348 | case bool__amg: |
| 1349 | (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg])); |
| 1350 | break; |
| 1351 | case numer_amg: |
| 1352 | (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg])); |
| 1353 | break; |
| 1354 | case string_amg: |
| 1355 | (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg])); |
| 1356 | break; |
| 1357 | case not_amg: |
| 1358 | (void)((cv = cvp[off=bool__amg]) |
| 1359 | || (cv = cvp[off=numer_amg]) |
| 1360 | || (cv = cvp[off=string_amg])); |
| 1361 | postpr = 1; |
| 1362 | break; |
| 1363 | case copy_amg: |
| 1364 | { |
| 1365 | /* |
| 1366 | * SV* ref causes confusion with the interpreter variable of |
| 1367 | * the same name |
| 1368 | */ |
| 1369 | SV* tmpRef=SvRV(left); |
| 1370 | if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) { |
| 1371 | /* |
| 1372 | * Just to be extra cautious. Maybe in some |
| 1373 | * additional cases sv_setsv is safe, too. |
| 1374 | */ |
| 1375 | SV* newref = newSVsv(tmpRef); |
| 1376 | SvOBJECT_on(newref); |
| 1377 | SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef)); |
| 1378 | return newref; |
| 1379 | } |
| 1380 | } |
| 1381 | break; |
| 1382 | case abs_amg: |
| 1383 | if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg]) |
| 1384 | && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) { |
| 1385 | SV* nullsv=sv_2mortal(newSViv(0)); |
| 1386 | if (off1==lt_amg) { |
| 1387 | SV* lessp = amagic_call(left,nullsv, |
| 1388 | lt_amg,AMGf_noright); |
| 1389 | logic = SvTRUE(lessp); |
| 1390 | } else { |
| 1391 | SV* lessp = amagic_call(left,nullsv, |
| 1392 | ncmp_amg,AMGf_noright); |
| 1393 | logic = (SvNV(lessp) < 0); |
| 1394 | } |
| 1395 | if (logic) { |
| 1396 | if (off==subtr_amg) { |
| 1397 | right = left; |
| 1398 | left = nullsv; |
| 1399 | lr = 1; |
| 1400 | } |
| 1401 | } else { |
| 1402 | return left; |
| 1403 | } |
| 1404 | } |
| 1405 | break; |
| 1406 | case neg_amg: |
| 1407 | if ((cv = cvp[off=subtr_amg])) { |
| 1408 | right = left; |
| 1409 | left = sv_2mortal(newSViv(0)); |
| 1410 | lr = 1; |
| 1411 | } |
| 1412 | break; |
| 1413 | case iter_amg: /* XXXX Eventually should do to_gv. */ |
| 1414 | /* FAIL safe */ |
| 1415 | return NULL; /* Delegate operation to standard mechanisms. */ |
| 1416 | break; |
| 1417 | case to_sv_amg: |
| 1418 | case to_av_amg: |
| 1419 | case to_hv_amg: |
| 1420 | case to_gv_amg: |
| 1421 | case to_cv_amg: |
| 1422 | /* FAIL safe */ |
| 1423 | return left; /* Delegate operation to standard mechanisms. */ |
| 1424 | break; |
| 1425 | default: |
| 1426 | goto not_found; |
| 1427 | } |
| 1428 | if (!cv) goto not_found; |
| 1429 | } else if (!(AMGf_noright & flags) && SvAMAGIC(right) |
| 1430 | && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c')) |
| 1431 | && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) |
| 1432 | ? (amtp = (AMT*)mg->mg_ptr)->table |
| 1433 | : (CV **) NULL)) |
| 1434 | && (cv = cvp[off=method])) { /* Method for right |
| 1435 | * argument found */ |
| 1436 | lr=1; |
| 1437 | } else if (((ocvp && oamtp->fallback > AMGfallNEVER |
| 1438 | && (cvp=ocvp) && (lr = -1)) |
| 1439 | || (cvp && amtp->fallback > AMGfallNEVER && (lr=1))) |
| 1440 | && !(flags & AMGf_unary)) { |
| 1441 | /* We look for substitution for |
| 1442 | * comparison operations and |
| 1443 | * concatenation */ |
| 1444 | if (method==concat_amg || method==concat_ass_amg |
| 1445 | || method==repeat_amg || method==repeat_ass_amg) { |
| 1446 | return NULL; /* Delegate operation to string conversion */ |
| 1447 | } |
| 1448 | off = -1; |
| 1449 | switch (method) { |
| 1450 | case lt_amg: |
| 1451 | case le_amg: |
| 1452 | case gt_amg: |
| 1453 | case ge_amg: |
| 1454 | case eq_amg: |
| 1455 | case ne_amg: |
| 1456 | postpr = 1; off=ncmp_amg; break; |
| 1457 | case slt_amg: |
| 1458 | case sle_amg: |
| 1459 | case sgt_amg: |
| 1460 | case sge_amg: |
| 1461 | case seq_amg: |
| 1462 | case sne_amg: |
| 1463 | postpr = 1; off=scmp_amg; break; |
| 1464 | } |
| 1465 | if (off != -1) cv = cvp[off]; |
| 1466 | if (!cv) { |
| 1467 | goto not_found; |
| 1468 | } |
| 1469 | } else { |
| 1470 | not_found: /* No method found, either report or croak */ |
| 1471 | switch (method) { |
| 1472 | case to_sv_amg: |
| 1473 | case to_av_amg: |
| 1474 | case to_hv_amg: |
| 1475 | case to_gv_amg: |
| 1476 | case to_cv_amg: |
| 1477 | /* FAIL safe */ |
| 1478 | return left; /* Delegate operation to standard mechanisms. */ |
| 1479 | break; |
| 1480 | } |
| 1481 | if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */ |
| 1482 | notfound = 1; lr = -1; |
| 1483 | } else if (cvp && (cv=cvp[nomethod_amg])) { |
| 1484 | notfound = 1; lr = 1; |
| 1485 | } else { |
| 1486 | SV *msg; |
| 1487 | if (off==-1) off=method; |
| 1488 | msg = sv_2mortal(Perl_newSVpvf(aTHX_ |
| 1489 | "Operation `%s': no method found,%sargument %s%s%s%s", |
| 1490 | AMG_id2name(method + assignshift), |
| 1491 | (flags & AMGf_unary ? " " : "\n\tleft "), |
| 1492 | SvAMAGIC(left)? |
| 1493 | "in overloaded package ": |
| 1494 | "has no overloaded magic", |
| 1495 | SvAMAGIC(left)? |
| 1496 | HvNAME(SvSTASH(SvRV(left))): |
| 1497 | "", |
| 1498 | SvAMAGIC(right)? |
| 1499 | ",\n\tright argument in overloaded package ": |
| 1500 | (flags & AMGf_unary |
| 1501 | ? "" |
| 1502 | : ",\n\tright argument has no overloaded magic"), |
| 1503 | SvAMAGIC(right)? |
| 1504 | HvNAME(SvSTASH(SvRV(right))): |
| 1505 | "")); |
| 1506 | if (amtp && amtp->fallback >= AMGfallYES) { |
| 1507 | DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX(msg)) ); |
| 1508 | } else { |
| 1509 | Perl_croak(aTHX_ "%"SVf, msg); |
| 1510 | } |
| 1511 | return NULL; |
| 1512 | } |
| 1513 | force_cpy = force_cpy || assign; |
| 1514 | } |
| 1515 | } |
| 1516 | if (!notfound) { |
| 1517 | DEBUG_o( Perl_deb(aTHX_ |
| 1518 | "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n", |
| 1519 | AMG_id2name(off), |
| 1520 | method+assignshift==off? "" : |
| 1521 | " (initially `", |
| 1522 | method+assignshift==off? "" : |
| 1523 | AMG_id2name(method+assignshift), |
| 1524 | method+assignshift==off? "" : "')", |
| 1525 | flags & AMGf_unary? "" : |
| 1526 | lr==1 ? " for right argument": " for left argument", |
| 1527 | flags & AMGf_unary? " for argument" : "", |
| 1528 | HvNAME(stash), |
| 1529 | fl? ",\n\tassignment variant used": "") ); |
| 1530 | } |
| 1531 | /* Since we use shallow copy during assignment, we need |
| 1532 | * to dublicate the contents, probably calling user-supplied |
| 1533 | * version of copy operator |
| 1534 | */ |
| 1535 | /* We need to copy in following cases: |
| 1536 | * a) Assignment form was called. |
| 1537 | * assignshift==1, assign==T, method + 1 == off |
| 1538 | * b) Increment or decrement, called directly. |
| 1539 | * assignshift==0, assign==0, method + 0 == off |
| 1540 | * c) Increment or decrement, translated to assignment add/subtr. |
| 1541 | * assignshift==0, assign==T, |
| 1542 | * force_cpy == T |
| 1543 | * d) Increment or decrement, translated to nomethod. |
| 1544 | * assignshift==0, assign==0, |
| 1545 | * force_cpy == T |
| 1546 | * e) Assignment form translated to nomethod. |
| 1547 | * assignshift==1, assign==T, method + 1 != off |
| 1548 | * force_cpy == T |
| 1549 | */ |
| 1550 | /* off is method, method+assignshift, or a result of opcode substitution. |
| 1551 | * In the latter case assignshift==0, so only notfound case is important. |
| 1552 | */ |
| 1553 | if (( (method + assignshift == off) |
| 1554 | && (assign || (method == inc_amg) || (method == dec_amg))) |
| 1555 | || force_cpy) |
| 1556 | RvDEEPCP(left); |
| 1557 | { |
| 1558 | dSP; |
| 1559 | BINOP myop; |
| 1560 | SV* res; |
| 1561 | bool oldcatch = CATCH_GET; |
| 1562 | |
| 1563 | CATCH_SET(TRUE); |
| 1564 | Zero(&myop, 1, BINOP); |
| 1565 | myop.op_last = (OP *) &myop; |
| 1566 | myop.op_next = Nullop; |
| 1567 | myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED; |
| 1568 | |
| 1569 | PUSHSTACKi(PERLSI_OVERLOAD); |
| 1570 | ENTER; |
| 1571 | SAVEOP(); |
| 1572 | PL_op = (OP *) &myop; |
| 1573 | if (PERLDB_SUB && PL_curstash != PL_debstash) |
| 1574 | PL_op->op_private |= OPpENTERSUB_DB; |
| 1575 | PUTBACK; |
| 1576 | pp_pushmark(); |
| 1577 | |
| 1578 | EXTEND(SP, notfound + 5); |
| 1579 | PUSHs(lr>0? right: left); |
| 1580 | PUSHs(lr>0? left: right); |
| 1581 | PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no )); |
| 1582 | if (notfound) { |
| 1583 | PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0))); |
| 1584 | } |
| 1585 | PUSHs((SV*)cv); |
| 1586 | PUTBACK; |
| 1587 | |
| 1588 | if ((PL_op = Perl_pp_entersub(aTHX))) |
| 1589 | CALLRUNOPS(aTHX); |
| 1590 | LEAVE; |
| 1591 | SPAGAIN; |
| 1592 | |
| 1593 | res=POPs; |
| 1594 | PUTBACK; |
| 1595 | POPSTACK; |
| 1596 | CATCH_SET(oldcatch); |
| 1597 | |
| 1598 | if (postpr) { |
| 1599 | int ans; |
| 1600 | switch (method) { |
| 1601 | case le_amg: |
| 1602 | case sle_amg: |
| 1603 | ans=SvIV(res)<=0; break; |
| 1604 | case lt_amg: |
| 1605 | case slt_amg: |
| 1606 | ans=SvIV(res)<0; break; |
| 1607 | case ge_amg: |
| 1608 | case sge_amg: |
| 1609 | ans=SvIV(res)>=0; break; |
| 1610 | case gt_amg: |
| 1611 | case sgt_amg: |
| 1612 | ans=SvIV(res)>0; break; |
| 1613 | case eq_amg: |
| 1614 | case seq_amg: |
| 1615 | ans=SvIV(res)==0; break; |
| 1616 | case ne_amg: |
| 1617 | case sne_amg: |
| 1618 | ans=SvIV(res)!=0; break; |
| 1619 | case inc_amg: |
| 1620 | case dec_amg: |
| 1621 | SvSetSV(left,res); return left; |
| 1622 | case not_amg: |
| 1623 | ans=!SvTRUE(res); break; |
| 1624 | } |
| 1625 | return boolSV(ans); |
| 1626 | } else if (method==copy_amg) { |
| 1627 | if (!SvROK(res)) { |
| 1628 | Perl_croak(aTHX_ "Copy method did not return a reference"); |
| 1629 | } |
| 1630 | return SvREFCNT_inc(SvRV(res)); |
| 1631 | } else { |
| 1632 | return res; |
| 1633 | } |
| 1634 | } |
| 1635 | } |
| 1636 | |
| 1637 | /* |
| 1638 | =for apidoc is_gv_magical |
| 1639 | |
| 1640 | Returns C<TRUE> if given the name of a magical GV. |
| 1641 | |
| 1642 | Currently only useful internally when determining if a GV should be |
| 1643 | created even in rvalue contexts. |
| 1644 | |
| 1645 | C<flags> is not used at present but available for future extension to |
| 1646 | allow selecting particular classes of magical variable. |
| 1647 | |
| 1648 | =cut |
| 1649 | */ |
| 1650 | bool |
| 1651 | Perl_is_gv_magical(pTHX_ char *name, STRLEN len, U32 flags) |
| 1652 | { |
| 1653 | if (!len) |
| 1654 | return FALSE; |
| 1655 | |
| 1656 | switch (*name) { |
| 1657 | case 'I': |
| 1658 | if (len == 3 && strEQ(name, "ISA")) |
| 1659 | goto yes; |
| 1660 | break; |
| 1661 | case 'O': |
| 1662 | if (len == 8 && strEQ(name, "OVERLOAD")) |
| 1663 | goto yes; |
| 1664 | break; |
| 1665 | case 'S': |
| 1666 | if (len == 3 && strEQ(name, "SIG")) |
| 1667 | goto yes; |
| 1668 | break; |
| 1669 | case '\017': /* $^O & $^OPEN */ |
| 1670 | if (len == 1 |
| 1671 | || (len == 4 && strEQ(name, "\027PEN"))) |
| 1672 | { |
| 1673 | goto yes; |
| 1674 | } |
| 1675 | break; |
| 1676 | case '\027': /* $^W & $^WARNING_BITS */ |
| 1677 | if (len == 1 |
| 1678 | || (len == 12 && strEQ(name, "\027ARNING_BITS")) |
| 1679 | || (len == 17 && strEQ(name, "\027IDE_SYSTEM_CALLS"))) |
| 1680 | { |
| 1681 | goto yes; |
| 1682 | } |
| 1683 | break; |
| 1684 | |
| 1685 | case '&': |
| 1686 | case '`': |
| 1687 | case '\'': |
| 1688 | case ':': |
| 1689 | case '?': |
| 1690 | case '!': |
| 1691 | case '-': |
| 1692 | case '#': |
| 1693 | case '*': |
| 1694 | case '[': |
| 1695 | case '^': |
| 1696 | case '~': |
| 1697 | case '=': |
| 1698 | case '%': |
| 1699 | case '.': |
| 1700 | case '(': |
| 1701 | case ')': |
| 1702 | case '<': |
| 1703 | case '>': |
| 1704 | case ',': |
| 1705 | case '\\': |
| 1706 | case '/': |
| 1707 | case '|': |
| 1708 | case '+': |
| 1709 | case ';': |
| 1710 | case ']': |
| 1711 | case '\001': /* $^A */ |
| 1712 | case '\003': /* $^C */ |
| 1713 | case '\004': /* $^D */ |
| 1714 | case '\005': /* $^E */ |
| 1715 | case '\006': /* $^F */ |
| 1716 | case '\010': /* $^H */ |
| 1717 | case '\011': /* $^I, NOT \t in EBCDIC */ |
| 1718 | case '\014': /* $^L */ |
| 1719 | case '\020': /* $^P */ |
| 1720 | case '\023': /* $^S */ |
| 1721 | case '\024': /* $^T */ |
| 1722 | case '\026': /* $^V */ |
| 1723 | if (len == 1) |
| 1724 | goto yes; |
| 1725 | break; |
| 1726 | case '1': |
| 1727 | case '2': |
| 1728 | case '3': |
| 1729 | case '4': |
| 1730 | case '5': |
| 1731 | case '6': |
| 1732 | case '7': |
| 1733 | case '8': |
| 1734 | case '9': |
| 1735 | if (len > 1) { |
| 1736 | char *end = name + len; |
| 1737 | while (--end > name) { |
| 1738 | if (!isDIGIT(*end)) |
| 1739 | return FALSE; |
| 1740 | } |
| 1741 | } |
| 1742 | yes: |
| 1743 | return TRUE; |
| 1744 | default: |
| 1745 | break; |
| 1746 | } |
| 1747 | return FALSE; |
| 1748 | } |