3 * Copyright (c) 1991-1999, Larry Wall
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.
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,'
24 Perl_gv_AVadd(pTHX_ register GV *gv)
26 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
27 Perl_croak(aTHX_ "Bad symbol for array");
34 Perl_gv_HVadd(pTHX_ register GV *gv)
36 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
37 Perl_croak(aTHX_ "Bad symbol for hash");
44 Perl_gv_IOadd(pTHX_ register GV *gv)
46 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
47 Perl_croak(aTHX_ "Bad symbol for filehandle");
54 Perl_gv_fetchfile(pTHX_ const char *name)
62 tmplen = strlen(name) + 2;
63 if (tmplen < sizeof smallbuf)
66 New(603, tmpbuf, tmplen + 1, char);
69 strcpy(tmpbuf + 2, name);
70 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
72 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
73 sv_setpv(GvSV(gv), name);
74 #ifdef MACOS_TRADITIONAL
75 if (strchr(name, ':') && instr(name,".pm"))
77 if (*name == '/' && (instr(name, "/lib/") || instr(name, ".pm")))
81 hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
83 if (tmpbuf != smallbuf)
89 Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
93 bool doproto = SvTYPE(gv) > SVt_NULL;
94 char *proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
96 sv_upgrade((SV*)gv, SVt_PVGV);
105 Newz(602, gp, 1, GP);
106 GvGP(gv) = gp_ref(gp);
107 GvSV(gv) = NEWSV(72,0);
108 GvLINE(gv) = PL_curcop->cop_line;
109 GvFILE(gv) = PL_curcop->cop_filegv ? SvPVX(GvSV(PL_curcop->cop_filegv)) : "";
112 sv_magic((SV*)gv, (SV*)gv, '*', name, len);
113 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
114 GvNAME(gv) = savepvn(name, len);
116 if (multi || doproto) /* doproto means it _was_ mentioned */
118 if (doproto) { /* Replicate part of newSUB here. */
121 /* XXX unsafe for threads if eval_owner isn't held */
122 start_subparse(0,0); /* Create CV in compcv. */
123 GvCV(gv) = PL_compcv;
127 CvGV(GvCV(gv)) = (GV*)SvREFCNT_inc(gv);
128 CvSTASH(GvCV(gv)) = PL_curstash;
130 CvOWNER(GvCV(gv)) = 0;
131 if (!CvMUTEXP(GvCV(gv))) {
132 New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex);
133 MUTEX_INIT(CvMUTEXP(GvCV(gv)));
135 #endif /* USE_THREADS */
137 sv_setpv((SV*)GvCV(gv), proto);
144 S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
160 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
170 if ((level > 100) || (level < -100))
171 Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
172 name, HvNAME(stash));
174 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,HvNAME(stash)) );
176 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
181 if (SvTYPE(topgv) != SVt_PVGV)
182 gv_init(topgv, stash, name, len, TRUE);
183 if (cv = GvCV(topgv)) {
184 /* If genuine method or valid cache entry, use it */
185 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
187 /* Stale cached entry: junk it */
189 GvCV(topgv) = cv = Nullcv;
192 else if (GvCVGEN(topgv) == PL_sub_generation)
193 return 0; /* cache indicates sub doesn't exist */
196 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
197 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
199 /* create and re-create @.*::SUPER::ISA on demand */
200 if (!av || !SvMAGIC(av)) {
201 char* packname = HvNAME(stash);
202 STRLEN packlen = strlen(packname);
204 if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
208 basestash = gv_stashpvn(packname, packlen, TRUE);
209 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
210 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
211 dTHR; /* just for SvREFCNT_dec */
212 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
213 if (!gvp || !(gv = *gvp))
214 Perl_croak(aTHX_ "Cannot create %s::ISA", HvNAME(stash));
215 if (SvTYPE(gv) != SVt_PVGV)
216 gv_init(gv, stash, "ISA", 3, TRUE);
217 SvREFCNT_dec(GvAV(gv));
218 GvAV(gv) = (AV*)SvREFCNT_inc(av);
224 SV** svp = AvARRAY(av);
225 /* NOTE: No support for tied ISA */
226 I32 items = AvFILLp(av) + 1;
229 HV* basestash = gv_stashsv(sv, FALSE);
231 dTHR; /* just for ckWARN */
232 if (ckWARN(WARN_MISC))
233 Perl_warner(aTHX_ WARN_MISC, "Can't locate package %s for @%s::ISA",
234 SvPVX(sv), HvNAME(stash));
237 gv = gv_fetchmeth(basestash, name, len,
238 (level >= 0) ? level + 1 : level - 1);
244 /* if at top level, try UNIVERSAL */
246 if (level == 0 || level == -1) {
249 if (lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE)) {
250 if (gv = gv_fetchmeth(lastchance, name, len,
251 (level >= 0) ? level + 1 : level - 1)) {
254 * Cache method in topgv if:
255 * 1. topgv has no synonyms (else inheritance crosses wires)
256 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
259 GvREFCNT(topgv) == 1 &&
261 (CvROOT(cv) || CvXSUB(cv)))
263 if (cv = GvCV(topgv))
265 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
266 GvCVGEN(topgv) = PL_sub_generation;
270 else if (topgv && GvREFCNT(topgv) == 1) {
271 /* cache the fact that the method is not defined */
272 GvCVGEN(topgv) = PL_sub_generation;
281 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
283 return gv_fetchmethod_autoload(stash, name, TRUE);
287 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
290 register const char *nend;
291 const char *nsplit = 0;
294 for (nend = name; *nend; nend++) {
297 else if (*nend == ':' && *(nend + 1) == ':')
301 const char *origname = name;
305 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
306 /* ->SUPER::method should really be looked up in original stash */
307 SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
308 HvNAME(PL_curcop->cop_stash)));
309 stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
310 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
311 origname, HvNAME(stash), name) );
314 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
317 gv = gv_fetchmeth(stash, name, nend - name, 0);
319 if (strEQ(name,"import"))
320 gv = (GV*)&PL_sv_yes;
322 gv = gv_autoload4(stash, name, nend - name, TRUE);
326 if (!CvROOT(cv) && !CvXSUB(cv)) {
334 if (GvCV(stubgv) != cv) /* orphaned import */
337 autogv = gv_autoload4(GvSTASH(stubgv),
338 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
348 Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
351 static char autoload[] = "AUTOLOAD";
352 static STRLEN autolen = 8;
359 if (len == autolen && strnEQ(name, autoload, autolen))
361 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
366 * Inheriting AUTOLOAD for non-methods works ... for now.
368 if (ckWARN(WARN_DEPRECATED) && !method &&
369 (GvCVGEN(gv) || GvSTASH(gv) != stash))
370 Perl_warner(aTHX_ WARN_DEPRECATED,
371 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
372 HvNAME(stash), (int)len, name);
375 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
376 * The subroutine's original name may not be "AUTOLOAD", so we don't
377 * use that, but for lack of anything better we will use the sub's
378 * original package to look up $AUTOLOAD.
380 varstash = GvSTASH(CvGV(cv));
381 vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
383 gv_init(vargv, varstash, autoload, autolen, FALSE);
385 sv_setpv(varsv, HvNAME(stash));
386 sv_catpvn(varsv, "::", 2);
387 sv_catpvn(varsv, name, len);
388 SvTAINTED_off(varsv);
393 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
395 return gv_stashpvn(name, strlen(name), create);
399 Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
406 if (namelen + 3 < sizeof smallbuf)
409 New(606, tmpbuf, namelen + 3, char);
410 Copy(name,tmpbuf,namelen,char);
411 tmpbuf[namelen++] = ':';
412 tmpbuf[namelen++] = ':';
413 tmpbuf[namelen] = '\0';
414 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
415 if (tmpbuf != smallbuf)
420 GvHV(tmpgv) = newHV();
423 HvNAME(stash) = savepv(name);
428 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
433 return gv_stashpvn(ptr, len, create);
438 Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
441 register const char *name = nambeg;
445 register const char *namend;
449 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
452 for (namend = name; *namend; namend++) {
453 if ((*namend == '\'' && namend[1]) ||
454 (*namend == ':' && namend[1] == ':'))
458 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
466 if (len + 3 < sizeof smallbuf)
469 New(601, tmpbuf, len+3, char);
470 Copy(name, tmpbuf, len, char);
474 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
475 gv = gvp ? *gvp : Nullgv;
476 if (gv && gv != (GV*)&PL_sv_undef) {
477 if (SvTYPE(gv) != SVt_PVGV)
478 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
482 if (tmpbuf != smallbuf)
484 if (!gv || gv == (GV*)&PL_sv_undef)
487 if (!(stash = GvHV(gv)))
488 stash = GvHV(gv) = newHV();
491 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
499 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
506 /* No stash in name, so see how we can default */
510 || (IN_UTF8 && ((*name & 0xc0) == 0xc0) && isIDFIRST_utf8((U8*)name)))
514 if (isUPPER(*name)) {
515 if (*name == 'S' && (
516 strEQ(name, "SIG") ||
517 strEQ(name, "STDIN") ||
518 strEQ(name, "STDOUT") ||
519 strEQ(name, "STDERR")))
521 else if (*name == 'I' && strEQ(name, "INC"))
523 else if (*name == 'E' && strEQ(name, "ENV"))
525 else if (*name == 'A' && (
526 strEQ(name, "ARGV") ||
527 strEQ(name, "ARGVOUT")))
530 else if (*name == '_' && !name[1])
535 else if ((COP*)PL_curcop == &PL_compiling) {
537 if (add && (PL_hints & HINT_STRICT_VARS) &&
538 !(add & GV_ADDOUR) &&
539 sv_type != SVt_PVCV &&
540 sv_type != SVt_PVGV &&
541 sv_type != SVt_PVFM &&
542 sv_type != SVt_PVIO &&
543 !(len == 1 && sv_type == SVt_PV && strchr("ab",*name)) )
545 gvp = (GV**)hv_fetch(stash,name,len,0);
547 *gvp == (GV*)&PL_sv_undef ||
548 SvTYPE(*gvp) != SVt_PVGV)
552 else if (sv_type == SVt_PV && !GvIMPORTED_SV(*gvp) ||
553 sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp) ||
554 sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp) )
556 Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
557 sv_type == SVt_PVAV ? '@' :
558 sv_type == SVt_PVHV ? '%' : '$',
561 Perl_warn(aTHX_ "(Did you mean &%s instead?)\n", name);
567 stash = PL_curcop->cop_stash;
573 /* By this point we should have a stash and a name */
577 qerror(Perl_mess(aTHX_
578 "Global symbol \"%s%s\" requires explicit package name",
579 (sv_type == SVt_PV ? "$"
580 : sv_type == SVt_PVAV ? "@"
581 : sv_type == SVt_PVHV ? "%"
587 if (!SvREFCNT(stash)) /* symbol table under destruction */
590 gvp = (GV**)hv_fetch(stash,name,len,add);
591 if (!gvp || *gvp == (GV*)&PL_sv_undef)
594 if (SvTYPE(gv) == SVt_PVGV) {
597 gv_init_sv(gv, sv_type);
600 } else if (add & GV_NOINIT) {
604 /* Adding a new symbol */
606 if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL))
607 Perl_warner(aTHX_ WARN_INTERNAL, "Had to create %s unexpectedly", nambeg);
608 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
609 gv_init_sv(gv, sv_type);
610 GvFLAGS(gv) |= add_gvflags;
612 if (isLEXWARN_on && isALPHA(name[0]) && ! ckWARN(WARN_ONCE))
615 /* set up magic where warranted */
618 if (strEQ(name, "ARGV")) {
619 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
623 if (strnEQ(name, "EXPORT", 6))
627 if (strEQ(name, "ISA")) {
630 sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
631 /* NOTE: No support for tied ISA */
632 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
633 && AvFILLp(av) == -1)
636 av_push(av, newSVpvn(pname = "NDBM_File",9));
637 gv_stashpvn(pname, 9, TRUE);
638 av_push(av, newSVpvn(pname = "DB_File",7));
639 gv_stashpvn(pname, 7, TRUE);
640 av_push(av, newSVpvn(pname = "GDBM_File",9));
641 gv_stashpvn(pname, 9, TRUE);
642 av_push(av, newSVpvn(pname = "SDBM_File",9));
643 gv_stashpvn(pname, 9, TRUE);
644 av_push(av, newSVpvn(pname = "ODBM_File",9));
645 gv_stashpvn(pname, 9, TRUE);
650 if (strEQ(name, "OVERLOAD")) {
653 hv_magic(hv, gv, 'A');
657 if (strEQ(name, "SIG")) {
662 hv_magic(hv, gv, 'S');
663 for(i = 1; PL_sig_name[i]; i++) {
665 init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
667 sv_setsv(*init, &PL_sv_undef);
674 if (strEQ(name, "VERSION"))
681 PL_sawampersand = TRUE;
687 PL_sawampersand = TRUE;
693 PL_sawampersand = TRUE;
699 sv_setpv(GvSV(gv),PL_chopset);
705 #ifdef COMPLEX_STATUS
706 (void)SvUPGRADE(GvSV(gv), SVt_PVLV);
713 if (sv_type > SVt_PV && PL_curcop != &PL_compiling) {
714 HV* stash = gv_stashpvn("Errno",5,FALSE);
715 if (!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
718 require_pv("Errno.pm");
720 stash = gv_stashpvn("Errno",5,FALSE);
721 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
722 Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
731 sv_magic((SV*)av, Nullsv, 'D', Nullch, 0);
736 if (ckWARN(WARN_DEPRECATED) && len == 1 && sv_type == SVt_PV)
737 Perl_warner(aTHX_ WARN_DEPRECATED, "Use of $%s is deprecated", name);
759 case '\011': /* NOT \t in EBCDIC */
770 case '\027': /* $^W & $^Warnings */
771 if (len > 1 && strNE(name, "\027arnings"))
780 sv_magic((SV*)av, (SV*)av, 'D', Nullch, 0);
793 SvREADONLY_on(GvSV(gv));
795 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
801 sv_setpv(GvSV(gv),"\f");
802 PL_formfeed = GvSV(gv);
807 sv_setpv(GvSV(gv),"\034");
812 (void)SvUPGRADE(sv, SVt_PVNV);
813 sv_setpv(sv, PL_patchlevel);
823 Perl_gv_fullname3(pTHX_ SV *sv, GV *gv, const char *prefix)
825 HV *hv = GvSTASH(gv);
830 sv_setpv(sv, prefix ? prefix : "");
831 sv_catpv(sv,HvNAME(hv));
832 sv_catpvn(sv,"::", 2);
833 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
837 Perl_gv_efullname3(pTHX_ SV *sv, GV *gv, const char *prefix)
842 gv_fullname3(sv, egv, prefix);
845 /* XXX compatibility with versions <= 5.003. */
847 Perl_gv_fullname(pTHX_ SV *sv, GV *gv)
849 gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
852 /* XXX compatibility with versions <= 5.003. */
854 Perl_gv_efullname(pTHX_ SV *sv, GV *gv)
856 gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
866 io = (IO*)NEWSV(0,0);
867 sv_upgrade((SV *)io,SVt_PVIO);
870 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
871 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
872 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
873 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
874 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
879 Perl_gv_check(pTHX_ HV *stash)
890 for (i = 0; i <= (I32) HvMAX(stash); i++) {
891 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
892 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
893 (gv = (GV*)HeVAL(entry)) && (hv = GvHV(gv)) && HvNAME(hv))
895 if (hv != PL_defstash && hv != stash)
896 gv_check(hv); /* nested package */
898 else if (isALPHA(*HeKEY(entry))) {
899 gv = (GV*)HeVAL(entry);
900 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
902 PL_curcop->cop_line = GvLINE(gv);
903 filegv = GvFILEGV(gv); /* XXX could be made faster */
904 PL_curcop->cop_filegv = filegv;
905 if (filegv && GvMULTI(filegv)) /* Filename began with slash */
907 Perl_warner(aTHX_ WARN_ONCE,
908 "Name \"%s::%s\" used only once: possible typo",
909 HvNAME(stash), GvNAME(gv));
916 Perl_newGVgen(pTHX_ char *pack)
918 return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
922 /* hopefully this is only called on local symbol table entries */
925 Perl_gp_ref(pTHX_ GP *gp)
930 /* multi-named GPs cannot be used for method cache */
931 SvREFCNT_dec(gp->gp_cv);
936 /* Adding a new name to a subroutine invalidates method cache */
944 Perl_gp_free(pTHX_ GV *gv)
950 if (!gv || !(gp = GvGP(gv)))
952 if (gp->gp_refcnt == 0) {
953 if (ckWARN_d(WARN_INTERNAL))
954 Perl_warner(aTHX_ WARN_INTERNAL,
955 "Attempt to free unreferenced glob pointers");
959 /* Deleting the name of a subroutine invalidates method cache */
962 if (--gp->gp_refcnt > 0) {
963 if (gp->gp_egv == gv)
968 SvREFCNT_dec(gp->gp_sv);
969 SvREFCNT_dec(gp->gp_av);
970 SvREFCNT_dec(gp->gp_hv);
971 SvREFCNT_dec(gp->gp_io);
972 SvREFCNT_dec(gp->gp_cv);
973 SvREFCNT_dec(gp->gp_form);
979 #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
983 #ifdef MICROPORT /* Microport 2.4 hack */
988 return GvGP(gv)->gp_av;
990 return GvGP(gv_AVadd(gv))->gp_av;
997 return GvGP(gv)->gp_hv;
999 return GvGP(gv_HVadd(gv))->gp_hv;
1001 #endif /* Microport 2.4 hack */
1003 /* Updates and caches the CV's */
1006 Perl_Gv_AMupdate(pTHX_ HV *stash)
1013 MAGIC* mg=mg_find((SV*)stash,'c');
1014 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1018 if (mg && amtp->was_ok_am == PL_amagic_generation
1019 && amtp->was_ok_sub == PL_sub_generation)
1020 return AMT_AMAGIC(amtp);
1021 if (amtp && AMT_AMAGIC(amtp)) { /* Have table. */
1023 for (i=1; i<NofAMmeth; i++) {
1024 if (amtp->table[i]) {
1025 SvREFCNT_dec(amtp->table[i]);
1029 sv_unmagic((SV*)stash, 'c');
1031 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME(stash)) );
1033 amt.was_ok_am = PL_amagic_generation;
1034 amt.was_ok_sub = PL_sub_generation;
1035 amt.fallback = AMGfallNO;
1038 #ifdef OVERLOAD_VIA_HASH
1039 gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE); /* A shortcut */
1040 if (gvp && ((gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv)))) {
1047 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1049 if (( cp = (char *)PL_AMG_names[0] ) &&
1050 (svp = (SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
1051 if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1052 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1054 for (i = 1; i < NofAMmeth; i++) {
1056 cp = (char *)PL_AMG_names[i];
1058 svp = (SV**)hv_fetch(hv, cp, strlen(cp), FALSE);
1059 if (svp && ((sv = *svp) != &PL_sv_undef)) {
1060 switch (SvTYPE(sv)) {
1063 if (!SvOK(sv)) break;
1064 gv = gv_fetchmethod(stash, SvPV(sv, n_a));
1065 if (gv) cv = GvCV(gv);
1069 if (SvTYPE(cv) == SVt_PVCV)
1074 Perl_croak(aTHX_ "Not a subroutine reference in overload table");
1080 if (!(cv = GvCVu((GV*)sv)))
1081 cv = sv_2cv(sv, &stash, &gv, FALSE);
1086 Perl_croak(aTHX_ "Method for operation %s not found in package %.256s during blessing\n",
1099 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1101 if ( cp = PL_AMG_names[0] ) {
1102 /* Try to find via inheritance. */
1103 gv = gv_fetchmeth(stash, "()", 2, -1); /* A cookie: "()". */
1104 if (gv) sv = GvSV(gv);
1106 if (!gv) goto no_table;
1107 else if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1108 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1111 for (i = 1; i < NofAMmeth; i++) {
1112 SV *cookie = sv_2mortal(Perl_newSVpvf(aTHX_ "(%s", cp = PL_AMG_names[i]));
1113 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of `%s' in package `%.256s'\n",
1114 cp, HvNAME(stash)) );
1115 /* don't fill the cache while looking up! */
1116 gv = gv_fetchmeth(stash, SvPVX(cookie), SvCUR(cookie), -1);
1118 if(gv && (cv = GvCV(gv))) {
1119 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1120 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1121 /* GvSV contains the name of the method. */
1124 DEBUG_o( Perl_deb(aTHX_ "Resolving method `%.256s' for overloaded `%s' in package `%.256s'\n",
1125 SvPV(GvSV(gv), n_a), cp, HvNAME(stash)) );
1126 if (!SvPOK(GvSV(gv))
1127 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1130 /* Can be an import stub (created by `can'). */
1132 Perl_croak(aTHX_ "Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'",
1133 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1136 Perl_croak(aTHX_ "Can't resolve method `%.256s' overloading `%s' in package `%.256s'",
1137 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1140 cv = GvCV(gv = ngv);
1142 DEBUG_o( Perl_deb(aTHX_ "Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1143 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1144 GvNAME(CvGV(cv))) );
1148 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1151 AMT_AMAGIC_on(&amt);
1152 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMT));
1156 /* Here we have no table: */
1158 AMT_AMAGIC_off(&amt);
1159 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMTS));
1164 Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
1169 CV **cvp=NULL, **ocvp=NULL;
1171 int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1172 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1174 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1175 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
1176 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1177 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1179 && ((cv = cvp[off=method+assignshift])
1180 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1182 (fl = 1, cv = cvp[off=method])))) {
1183 lr = -1; /* Call method for left argument */
1185 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1188 /* look for substituted methods */
1189 /* In all the covered cases we should be called with assign==0. */
1193 if ((cv = cvp[off=add_ass_amg])
1194 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1195 right = &PL_sv_yes; lr = -1; assign = 1;
1200 if ((cv = cvp[off = subtr_ass_amg])
1201 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1202 right = &PL_sv_yes; lr = -1; assign = 1;
1206 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1209 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1212 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1215 (void)((cv = cvp[off=bool__amg])
1216 || (cv = cvp[off=numer_amg])
1217 || (cv = cvp[off=string_amg]));
1223 * SV* ref causes confusion with the interpreter variable of
1226 SV* tmpRef=SvRV(left);
1227 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1229 * Just to be extra cautious. Maybe in some
1230 * additional cases sv_setsv is safe, too.
1232 SV* newref = newSVsv(tmpRef);
1233 SvOBJECT_on(newref);
1234 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
1240 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1241 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1242 SV* nullsv=sv_2mortal(newSViv(0));
1244 SV* lessp = amagic_call(left,nullsv,
1245 lt_amg,AMGf_noright);
1246 logic = SvTRUE(lessp);
1248 SV* lessp = amagic_call(left,nullsv,
1249 ncmp_amg,AMGf_noright);
1250 logic = (SvNV(lessp) < 0);
1253 if (off==subtr_amg) {
1264 if (cv = cvp[off=subtr_amg]) {
1266 left = sv_2mortal(newSViv(0));
1270 case iter_amg: /* XXXX Eventually should do to_gv. */
1277 return NULL; /* Delegate operation to standard mechanisms. */
1282 if (!cv) goto not_found;
1283 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1284 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
1285 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1286 ? (amtp = (AMT*)mg->mg_ptr)->table
1288 && (cv = cvp[off=method])) { /* Method for right
1291 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1292 && (cvp=ocvp) && (lr = -1))
1293 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1294 && !(flags & AMGf_unary)) {
1295 /* We look for substitution for
1296 * comparison operations and
1298 if (method==concat_amg || method==concat_ass_amg
1299 || method==repeat_amg || method==repeat_ass_amg) {
1300 return NULL; /* Delegate operation to string conversion */
1310 postpr = 1; off=ncmp_amg; break;
1317 postpr = 1; off=scmp_amg; break;
1319 if (off != -1) cv = cvp[off];
1324 not_found: /* No method found, either report or croak */
1325 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1326 notfound = 1; lr = -1;
1327 } else if (cvp && (cv=cvp[nomethod_amg])) {
1328 notfound = 1; lr = 1;
1331 if (off==-1) off=method;
1332 msg = sv_2mortal(Perl_newSVpvf(aTHX_
1333 "Operation `%s': no method found,%sargument %s%s%s%s",
1334 PL_AMG_names[method + assignshift],
1335 (flags & AMGf_unary ? " " : "\n\tleft "),
1337 "in overloaded package ":
1338 "has no overloaded magic",
1340 HvNAME(SvSTASH(SvRV(left))):
1343 ",\n\tright argument in overloaded package ":
1346 : ",\n\tright argument has no overloaded magic"),
1348 HvNAME(SvSTASH(SvRV(right))):
1350 if (amtp && amtp->fallback >= AMGfallYES) {
1351 DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX(msg)) );
1353 Perl_croak(aTHX_ "%_", msg);
1357 force_cpy = force_cpy || assign;
1361 DEBUG_o( Perl_deb(aTHX_
1362 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1364 method+assignshift==off? "" :
1366 method+assignshift==off? "" :
1367 PL_AMG_names[method+assignshift],
1368 method+assignshift==off? "" : "')",
1369 flags & AMGf_unary? "" :
1370 lr==1 ? " for right argument": " for left argument",
1371 flags & AMGf_unary? " for argument" : "",
1373 fl? ",\n\tassignment variant used": "") );
1375 /* Since we use shallow copy during assignment, we need
1376 * to dublicate the contents, probably calling user-supplied
1377 * version of copy operator
1379 /* We need to copy in following cases:
1380 * a) Assignment form was called.
1381 * assignshift==1, assign==T, method + 1 == off
1382 * b) Increment or decrement, called directly.
1383 * assignshift==0, assign==0, method + 0 == off
1384 * c) Increment or decrement, translated to assignment add/subtr.
1385 * assignshift==0, assign==T,
1387 * d) Increment or decrement, translated to nomethod.
1388 * assignshift==0, assign==0,
1390 * e) Assignment form translated to nomethod.
1391 * assignshift==1, assign==T, method + 1 != off
1394 /* off is method, method+assignshift, or a result of opcode substitution.
1395 * In the latter case assignshift==0, so only notfound case is important.
1397 if (( (method + assignshift == off)
1398 && (assign || (method == inc_amg) || (method == dec_amg)))
1405 bool oldcatch = CATCH_GET;
1408 Zero(&myop, 1, BINOP);
1409 myop.op_last = (OP *) &myop;
1410 myop.op_next = Nullop;
1411 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1413 PUSHSTACKi(PERLSI_OVERLOAD);
1416 PL_op = (OP *) &myop;
1417 if (PERLDB_SUB && PL_curstash != PL_debstash)
1418 PL_op->op_private |= OPpENTERSUB_DB;
1422 EXTEND(SP, notfound + 5);
1423 PUSHs(lr>0? right: left);
1424 PUSHs(lr>0? left: right);
1425 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1427 PUSHs( sv_2mortal(newSVpv((char *)PL_AMG_names[method + assignshift],0)));
1432 if (PL_op = Perl_pp_entersub(aTHX))
1440 CATCH_SET(oldcatch);
1447 ans=SvIV(res)<=0; break;
1450 ans=SvIV(res)<0; break;
1453 ans=SvIV(res)>=0; break;
1456 ans=SvIV(res)>0; break;
1459 ans=SvIV(res)==0; break;
1462 ans=SvIV(res)!=0; break;
1465 SvSetSV(left,res); return left;
1467 ans=!SvTRUE(res); break;
1470 } else if (method==copy_amg) {
1472 Perl_croak(aTHX_ "Copy method did not return a reference");
1474 return SvREFCNT_inc(SvRV(res));