3 * Copyright (c) 1991-1997, 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,'
23 gv_AVadd(register GV *gv)
25 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
26 croak("Bad symbol for array");
33 gv_HVadd(register GV *gv)
35 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
36 croak("Bad symbol for hash");
43 gv_IOadd(register GV *gv)
45 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
46 croak("Bad symbol for filehandle");
53 gv_fetchfile(char *name)
61 tmplen = strlen(name) + 2;
62 if (tmplen < sizeof smallbuf)
65 New(603, tmpbuf, tmplen + 1, char);
68 strcpy(tmpbuf + 2, name);
69 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
71 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
72 if (tmpbuf != smallbuf)
74 sv_setpv(GvSV(gv), name);
75 if (*name == '/' && (instr(name, "/lib/") || instr(name, ".pm")))
78 hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
83 gv_init(GV *gv, HV *stash, char *name, STRLEN len, int multi)
87 bool doproto = SvTYPE(gv) > SVt_NULL;
88 char *proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
90 sv_upgrade((SV*)gv, SVt_PVGV);
100 GvGP(gv) = gp_ref(gp);
101 GvSV(gv) = NEWSV(72,0);
102 GvLINE(gv) = PL_curcop->cop_line;
103 GvFILEGV(gv) = PL_curcop->cop_filegv;
106 sv_magic((SV*)gv, (SV*)gv, '*', name, len);
107 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
108 GvNAME(gv) = savepvn(name, len);
112 if (doproto) { /* Replicate part of newSUB here. */
115 start_subparse(0,0); /* Create CV in compcv. */
116 GvCV(gv) = PL_compcv;
120 CvGV(GvCV(gv)) = (GV*)SvREFCNT_inc(gv);
121 CvFILEGV(GvCV(gv)) = PL_curcop->cop_filegv;
122 CvSTASH(GvCV(gv)) = PL_curstash;
124 CvOWNER(GvCV(gv)) = 0;
125 if (!CvMUTEXP(GvCV(gv))) {
126 New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex);
127 MUTEX_INIT(CvMUTEXP(GvCV(gv)));
129 #endif /* USE_THREADS */
131 sv_setpv((SV*)GvCV(gv), proto);
138 gv_init_sv(GV *gv, I32 sv_type)
154 gv_fetchmeth(HV *stash, char *name, STRLEN len, I32 level)
164 if ((level > 100) || (level < -100))
165 croak("Recursive inheritance detected while looking for method '%s' in package '%s'",
166 name, HvNAME(stash));
168 DEBUG_o( deb("Looking for method %s in package %s\n",name,HvNAME(stash)) );
170 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
175 if (SvTYPE(topgv) != SVt_PVGV)
176 gv_init(topgv, stash, name, len, TRUE);
177 if (cv = GvCV(topgv)) {
178 /* If genuine method or valid cache entry, use it */
179 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
181 /* Stale cached entry: junk it */
183 GvCV(topgv) = cv = Nullcv;
186 else if (GvCVGEN(topgv) == PL_sub_generation)
187 return 0; /* cache indicates sub doesn't exist */
190 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
191 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
193 /* create and re-create @.*::SUPER::ISA on demand */
194 if (!av || !SvMAGIC(av)) {
195 char* packname = HvNAME(stash);
196 STRLEN packlen = strlen(packname);
198 if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
202 basestash = gv_stashpvn(packname, packlen, TRUE);
203 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
204 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
205 dTHR; /* just for SvREFCNT_dec */
206 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
207 if (!gvp || !(gv = *gvp))
208 croak("Cannot create %s::ISA", HvNAME(stash));
209 if (SvTYPE(gv) != SVt_PVGV)
210 gv_init(gv, stash, "ISA", 3, TRUE);
211 SvREFCNT_dec(GvAV(gv));
212 GvAV(gv) = (AV*)SvREFCNT_inc(av);
218 SV** svp = AvARRAY(av);
219 /* NOTE: No support for tied ISA */
220 I32 items = AvFILLp(av) + 1;
223 HV* basestash = gv_stashsv(sv, FALSE);
225 dTHR; /* just for ckWARN */
226 if (ckWARN(WARN_MISC))
227 warner(WARN_MISC, "Can't locate package %s for @%s::ISA",
228 SvPVX(sv), HvNAME(stash));
231 gv = gv_fetchmeth(basestash, name, len,
232 (level >= 0) ? level + 1 : level - 1);
238 /* if at top level, try UNIVERSAL */
240 if (level == 0 || level == -1) {
243 if (lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE)) {
244 if (gv = gv_fetchmeth(lastchance, name, len,
245 (level >= 0) ? level + 1 : level - 1)) {
248 * Cache method in topgv if:
249 * 1. topgv has no synonyms (else inheritance crosses wires)
250 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
253 GvREFCNT(topgv) == 1 &&
255 (CvROOT(cv) || CvXSUB(cv)))
257 if (cv = GvCV(topgv))
259 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
260 GvCVGEN(topgv) = PL_sub_generation;
264 else if (topgv && GvREFCNT(topgv) == 1) {
265 /* cache the fact that the method is not defined */
266 GvCVGEN(topgv) = PL_sub_generation;
275 gv_fetchmethod(HV *stash, char *name)
277 return gv_fetchmethod_autoload(stash, name, TRUE);
281 gv_fetchmethod_autoload(HV *stash, char *name, I32 autoload)
288 for (nend = name; *nend; nend++) {
291 else if (*nend == ':' && *(nend + 1) == ':')
295 char *origname = name;
299 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
300 /* ->SUPER::method should really be looked up in original stash */
301 SV *tmpstr = sv_2mortal(newSVpvf("%s::SUPER",
302 HvNAME(PL_curcop->cop_stash)));
303 stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
304 DEBUG_o( deb("Treating %s as %s::%s\n",
305 origname, HvNAME(stash), name) );
308 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
311 gv = gv_fetchmeth(stash, name, nend - name, 0);
313 if (strEQ(name,"import"))
314 gv = (GV*)&PL_sv_yes;
316 gv = gv_autoload4(stash, name, nend - name, TRUE);
320 if (!CvROOT(cv) && !CvXSUB(cv)) {
328 if (GvCV(stubgv) != cv) /* orphaned import */
331 autogv = gv_autoload4(GvSTASH(stubgv),
332 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
342 gv_autoload4(HV *stash, char *name, STRLEN len, I32 method)
345 static char autoload[] = "AUTOLOAD";
346 static STRLEN autolen = 8;
353 if (len == autolen && strnEQ(name, autoload, autolen))
355 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
360 * Inheriting AUTOLOAD for non-methods works ... for now.
362 if (ckWARN(WARN_DEPRECATED) && !method &&
363 (GvCVGEN(gv) || GvSTASH(gv) != stash))
364 warner(WARN_DEPRECATED,
365 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
366 HvNAME(stash), (int)len, name);
369 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
370 * The subroutine's original name may not be "AUTOLOAD", so we don't
371 * use that, but for lack of anything better we will use the sub's
372 * original package to look up $AUTOLOAD.
374 varstash = GvSTASH(CvGV(cv));
375 vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
377 gv_init(vargv, varstash, autoload, autolen, FALSE);
379 sv_setpv(varsv, HvNAME(stash));
380 sv_catpvn(varsv, "::", 2);
381 sv_catpvn(varsv, name, len);
382 SvTAINTED_off(varsv);
387 gv_stashpv(char *name, I32 create)
389 return gv_stashpvn(name, strlen(name), create);
393 gv_stashpvn(char *name, U32 namelen, I32 create)
400 if (namelen + 3 < sizeof smallbuf)
403 New(606, tmpbuf, namelen + 3, char);
404 Copy(name,tmpbuf,namelen,char);
405 tmpbuf[namelen++] = ':';
406 tmpbuf[namelen++] = ':';
407 tmpbuf[namelen] = '\0';
408 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
409 if (tmpbuf != smallbuf)
414 GvHV(tmpgv) = newHV();
417 HvNAME(stash) = savepv(name);
422 gv_stashsv(SV *sv, I32 create)
427 return gv_stashpvn(ptr, len, create);
432 gv_fetchpv(char *nambeg, I32 add, I32 sv_type)
435 register char *name = nambeg;
439 register char *namend;
443 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
446 for (namend = name; *namend; namend++) {
447 if ((*namend == '\'' && namend[1]) ||
448 (*namend == ':' && namend[1] == ':'))
452 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
460 if (len + 3 < sizeof smallbuf)
463 New(601, tmpbuf, len+3, char);
464 Copy(name, tmpbuf, len, char);
468 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
469 gv = gvp ? *gvp : Nullgv;
470 if (gv && gv != (GV*)&PL_sv_undef) {
471 if (SvTYPE(gv) != SVt_PVGV)
472 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
476 if (tmpbuf != smallbuf)
478 if (!gv || gv == (GV*)&PL_sv_undef)
481 if (!(stash = GvHV(gv)))
482 stash = GvHV(gv) = newHV();
485 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
493 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
500 /* No stash in name, so see how we can default */
504 || (IN_UTF8 && ((*name & 0xc0) == 0xc0) && isIDFIRST_utf8((U8*)name)))
508 if (isUPPER(*name)) {
509 if (*name == 'S' && (
510 strEQ(name, "SIG") ||
511 strEQ(name, "STDIN") ||
512 strEQ(name, "STDOUT") ||
513 strEQ(name, "STDERR")))
515 else if (*name == 'I' && strEQ(name, "INC"))
517 else if (*name == 'E' && strEQ(name, "ENV"))
519 else if (*name == 'A' && (
520 strEQ(name, "ARGV") ||
521 strEQ(name, "ARGVOUT")))
524 else if (*name == '_' && !name[1])
529 else if ((COP*)PL_curcop == &PL_compiling) {
531 if (add && (PL_hints & HINT_STRICT_VARS) &&
532 sv_type != SVt_PVCV &&
533 sv_type != SVt_PVGV &&
534 sv_type != SVt_PVFM &&
535 sv_type != SVt_PVIO &&
536 !(len == 1 && sv_type == SVt_PV && strchr("ab",*name)) )
538 gvp = (GV**)hv_fetch(stash,name,len,0);
540 *gvp == (GV*)&PL_sv_undef ||
541 SvTYPE(*gvp) != SVt_PVGV)
545 else if (sv_type == SVt_PV && !GvIMPORTED_SV(*gvp) ||
546 sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp) ||
547 sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp) )
549 warn("Variable \"%c%s\" is not imported",
550 sv_type == SVt_PVAV ? '@' :
551 sv_type == SVt_PVHV ? '%' : '$',
554 warn("(Did you mean &%s instead?)\n", name);
560 stash = PL_curcop->cop_stash;
566 /* By this point we should have a stash and a name */
572 char sv_type_char = ((sv_type == SVt_PV) ? '$'
573 : (sv_type == SVt_PVAV) ? '@'
574 : (sv_type == SVt_PVHV) ? '%'
577 warn("Global symbol \"%c%s\" requires explicit package name",
580 warn("Global symbol \"%s\" requires explicit package name",
584 stash = PL_curstash ? PL_curstash : PL_defstash; /* avoid core dumps */
585 add_gvflags = ((sv_type == SVt_PV) ? GVf_IMPORTED_SV
586 : (sv_type == SVt_PVAV) ? GVf_IMPORTED_AV
587 : (sv_type == SVt_PVHV) ? GVf_IMPORTED_HV
591 if (!SvREFCNT(stash)) /* symbol table under destruction */
594 gvp = (GV**)hv_fetch(stash,name,len,add);
595 if (!gvp || *gvp == (GV*)&PL_sv_undef)
598 if (SvTYPE(gv) == SVt_PVGV) {
601 gv_init_sv(gv, sv_type);
604 } else if (add & GV_NOINIT) {
608 /* Adding a new symbol */
610 if (add & GV_ADDWARN)
611 warn("Had to create %s unexpectedly", nambeg);
612 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
613 gv_init_sv(gv, sv_type);
614 GvFLAGS(gv) |= add_gvflags;
616 /* set up magic where warranted */
619 if (strEQ(name, "ARGV")) {
620 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
630 if (strnEQ(name, "EXPORT", 6))
634 if (strEQ(name, "ISA")) {
637 sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
638 /* NOTE: No support for tied ISA */
639 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
640 && AvFILLp(av) == -1)
643 av_push(av, newSVpv(pname = "NDBM_File",0));
644 gv_stashpvn(pname, 9, TRUE);
645 av_push(av, newSVpv(pname = "DB_File",0));
646 gv_stashpvn(pname, 7, TRUE);
647 av_push(av, newSVpv(pname = "GDBM_File",0));
648 gv_stashpvn(pname, 9, TRUE);
649 av_push(av, newSVpv(pname = "SDBM_File",0));
650 gv_stashpvn(pname, 9, TRUE);
651 av_push(av, newSVpv(pname = "ODBM_File",0));
652 gv_stashpvn(pname, 9, TRUE);
658 if (strEQ(name, "OVERLOAD")) {
661 hv_magic(hv, gv, 'A');
664 #endif /* OVERLOAD */
666 if (strEQ(name, "SIG")) {
670 GvMULTI_on(PL_siggv);
671 hv = GvHVn(PL_siggv);
672 hv_magic(hv, PL_siggv, 'S');
673 for(i=1;PL_sig_name[i];i++) {
675 init=hv_fetch(hv,PL_sig_name[i],strlen(PL_sig_name[i]),1);
677 sv_setsv(*init,&PL_sv_undef);
688 PL_sawampersand = TRUE;
695 PL_sawampersand = TRUE;
702 PL_sawampersand = TRUE;
708 sv_setpv(GvSV(gv),PL_chopset);
714 #ifdef COMPLEX_STATUS
715 (void)SvUPGRADE(GvSV(gv), SVt_PVLV);
722 if (sv_type > SVt_PV && PL_curcop != &PL_compiling) {
723 HV* stash = gv_stashpvn("Errno",5,FALSE);
724 if(!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
727 perl_require_pv("Errno.pm");
729 stash = gv_stashpvn("Errno",5,FALSE);
730 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
731 croak("Can't use %%! because Errno.pm is not available");
740 sv_magic((SV*)av, Nullsv, 'D', Nullch, 0);
745 if (ckWARN(WARN_DEPRECATED) && len == 1 && sv_type == SVt_PV)
746 warner(WARN_DEPRECATED, "Use of $%s is deprecated", name);
769 case '\011': /* NOT \t in EBCDIC */
787 sv_magic((SV*)av, (SV*)av, 'D', Nullch, 0);
800 SvREADONLY_on(GvSV(gv));
802 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
808 sv_setpv(GvSV(gv),"\f");
809 PL_formfeed = GvSV(gv);
814 sv_setpv(GvSV(gv),"\034");
819 (void)SvUPGRADE(sv, SVt_PVNV);
820 sv_setpv(sv, PL_patchlevel);
830 gv_fullname3(SV *sv, GV *gv, char *prefix)
832 HV *hv = GvSTASH(gv);
837 sv_setpv(sv, prefix ? prefix : "");
838 sv_catpv(sv,HvNAME(hv));
839 sv_catpvn(sv,"::", 2);
840 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
844 gv_efullname3(SV *sv, GV *gv, char *prefix)
849 gv_fullname3(sv, egv, prefix);
852 /* XXX compatibility with versions <= 5.003. */
854 gv_fullname(SV *sv, GV *gv)
856 gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
859 /* XXX compatibility with versions <= 5.003. */
861 gv_efullname(SV *sv, GV *gv)
863 gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
873 io = (IO*)NEWSV(0,0);
874 sv_upgrade((SV *)io,SVt_PVIO);
877 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
879 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
880 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
896 for (i = 0; i <= (I32) HvMAX(stash); i++) {
897 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
898 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
899 (gv = (GV*)HeVAL(entry)) && (hv = GvHV(gv)) && HvNAME(hv))
901 if (hv != PL_defstash)
902 gv_check(hv); /* nested package */
904 else if (isALPHA(*HeKEY(entry))) {
905 gv = (GV*)HeVAL(entry);
906 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
908 PL_curcop->cop_line = GvLINE(gv);
909 filegv = GvFILEGV(gv);
910 PL_curcop->cop_filegv = filegv;
911 if (filegv && GvMULTI(filegv)) /* Filename began with slash */
914 "Name \"%s::%s\" used only once: possible typo",
915 HvNAME(stash), GvNAME(gv));
924 return gv_fetchpv(form("%s::_GEN_%ld", pack, (long)PL_gensym++),
928 /* hopefully this is only called on local symbol table entries */
936 /* multi-named GPs cannot be used for method cache */
937 SvREFCNT_dec(gp->gp_cv);
942 /* Adding a new name to a subroutine invalidates method cache */
955 if (!gv || !(gp = GvGP(gv)))
957 if (gp->gp_refcnt == 0) {
958 warn("Attempt to free unreferenced glob pointers");
962 /* Deleting the name of a subroutine invalidates method cache */
965 if (--gp->gp_refcnt > 0) {
966 if (gp->gp_egv == gv)
971 SvREFCNT_dec(gp->gp_sv);
972 SvREFCNT_dec(gp->gp_av);
973 SvREFCNT_dec(gp->gp_hv);
974 SvREFCNT_dec(gp->gp_io);
975 SvREFCNT_dec(gp->gp_cv);
976 SvREFCNT_dec(gp->gp_form);
982 #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
986 #ifdef MICROPORT /* Microport 2.4 hack */
991 return GvGP(gv)->gp_av;
993 return GvGP(gv_AVadd(gv))->gp_av;
1000 return GvGP(gv)->gp_hv;
1002 return GvGP(gv_HVadd(gv))->gp_hv;
1004 #endif /* Microport 2.4 hack */
1007 /* Updates and caches the CV's */
1010 Gv_AMupdate(HV *stash)
1017 MAGIC* mg=mg_find((SV*)stash,'c');
1018 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1021 if (mg && amtp->was_ok_am == PL_amagic_generation
1022 && amtp->was_ok_sub == PL_sub_generation)
1023 return AMT_AMAGIC(amtp);
1024 if (amtp && AMT_AMAGIC(amtp)) { /* Have table. */
1026 for (i=1; i<NofAMmeth; i++) {
1027 if (amtp->table[i]) {
1028 SvREFCNT_dec(amtp->table[i]);
1032 sv_unmagic((SV*)stash, 'c');
1034 DEBUG_o( deb("Recalcing overload magic in package %s\n",HvNAME(stash)) );
1036 amt.was_ok_am = PL_amagic_generation;
1037 amt.was_ok_sub = PL_sub_generation;
1038 amt.fallback = AMGfallNO;
1041 #ifdef OVERLOAD_VIA_HASH
1042 gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE); /* A shortcut */
1043 if (gvp && ((gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv)))) {
1050 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1052 if (( cp = (char *)PL_AMG_names[0] ) &&
1053 (svp = (SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
1054 if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1055 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1057 for (i = 1; i < NofAMmeth; i++) {
1059 cp = (char *)PL_AMG_names[i];
1061 svp = (SV**)hv_fetch(hv, cp, strlen(cp), FALSE);
1062 if (svp && ((sv = *svp) != &PL_sv_undef)) {
1063 switch (SvTYPE(sv)) {
1066 if (!SvOK(sv)) break;
1067 gv = gv_fetchmethod(stash, SvPV(sv, PL_na));
1068 if (gv) cv = GvCV(gv);
1072 if (SvTYPE(cv) == SVt_PVCV)
1077 croak("Not a subroutine reference in overload table");
1083 if (!(cv = GvCVu((GV*)sv)))
1084 cv = sv_2cv(sv, &stash, &gv, TRUE);
1089 croak("Method for operation %s not found in package %.256s during blessing\n",
1102 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
1104 if ( cp = PL_AMG_names[0] ) {
1105 /* Try to find via inheritance. */
1106 gv = gv_fetchmeth(stash, "()", 2, -1); /* A cookie: "()". */
1107 if (gv) sv = GvSV(gv);
1109 if (!gv) goto no_table;
1110 else if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1111 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1114 for (i = 1; i < NofAMmeth; i++) {
1115 SV *cookie = sv_2mortal(newSVpvf("(%s", cp = PL_AMG_names[i]));
1116 DEBUG_o( deb("Checking overloading of `%s' in package `%.256s'\n",
1117 cp, HvNAME(stash)) );
1118 /* don't fill the cache while looking up! */
1119 gv = gv_fetchmeth(stash, SvPVX(cookie), SvCUR(cookie), -1);
1121 if(gv && (cv = GvCV(gv))) {
1122 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1123 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1124 /* GvSV contains the name of the method. */
1127 DEBUG_o( deb("Resolving method `%.256s' for overloaded `%s' in package `%.256s'\n",
1128 SvPV(GvSV(gv), PL_na), cp, HvNAME(stash)) );
1129 if (!SvPOK(GvSV(gv))
1130 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1133 /* Can be an import stub (created by `can'). */
1135 croak("Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'",
1136 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1139 croak("Cannot resolve method `%.256s' overloading `%s' in package `%.256s'",
1140 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1143 cv = GvCV(gv = ngv);
1145 DEBUG_o( deb("Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1146 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1147 GvNAME(CvGV(cv))) );
1151 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1154 AMT_AMAGIC_on(&amt);
1155 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMT));
1159 /* Here we have no table: */
1161 AMT_AMAGIC_off(&amt);
1162 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMTS));
1167 amagic_call(SV *left, SV *right, int method, int flags)
1172 CV **cvp=NULL, **ocvp=NULL;
1174 int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1175 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1177 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1178 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
1179 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1180 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1182 && ((cv = cvp[off=method+assignshift])
1183 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1185 (fl = 1, cv = cvp[off=method])))) {
1186 lr = -1; /* Call method for left argument */
1188 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1191 /* look for substituted methods */
1192 /* In all the covered cases we should be called with assign==0. */
1196 if ((cv = cvp[off=add_ass_amg])
1197 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1198 right = &PL_sv_yes; lr = -1; assign = 1;
1203 if ((cv = cvp[off = subtr_ass_amg])
1204 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1205 right = &PL_sv_yes; lr = -1; assign = 1;
1209 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1212 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1215 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1218 (void)((cv = cvp[off=bool__amg])
1219 || (cv = cvp[off=numer_amg])
1220 || (cv = cvp[off=string_amg]));
1226 * SV* ref causes confusion with the interpreter variable of
1229 SV* tmpRef=SvRV(left);
1230 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1232 * Just to be extra cautious. Maybe in some
1233 * additional cases sv_setsv is safe, too.
1235 SV* newref = newSVsv(tmpRef);
1236 SvOBJECT_on(newref);
1237 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
1243 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1244 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1245 SV* nullsv=sv_2mortal(newSViv(0));
1247 SV* lessp = amagic_call(left,nullsv,
1248 lt_amg,AMGf_noright);
1249 logic = SvTRUE(lessp);
1251 SV* lessp = amagic_call(left,nullsv,
1252 ncmp_amg,AMGf_noright);
1253 logic = (SvNV(lessp) < 0);
1256 if (off==subtr_amg) {
1267 if (cv = cvp[off=subtr_amg]) {
1269 left = sv_2mortal(newSViv(0));
1273 case iter_amg: /* XXXX Eventually should do to_gv. */
1280 return NULL; /* Delegate operation to standard mechanisms. */
1285 if (!cv) goto not_found;
1286 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1287 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
1288 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1289 ? (amtp = (AMT*)mg->mg_ptr)->table
1291 && (cv = cvp[off=method])) { /* Method for right
1294 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1295 && (cvp=ocvp) && (lr = -1))
1296 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1297 && !(flags & AMGf_unary)) {
1298 /* We look for substitution for
1299 * comparison operations and
1301 if (method==concat_amg || method==concat_ass_amg
1302 || method==repeat_amg || method==repeat_ass_amg) {
1303 return NULL; /* Delegate operation to string conversion */
1313 postpr = 1; off=ncmp_amg; break;
1320 postpr = 1; off=scmp_amg; break;
1322 if (off != -1) cv = cvp[off];
1327 not_found: /* No method found, either report or croak */
1328 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1329 notfound = 1; lr = -1;
1330 } else if (cvp && (cv=cvp[nomethod_amg])) {
1331 notfound = 1; lr = 1;
1334 if (off==-1) off=method;
1335 msg = sv_2mortal(newSVpvf(
1336 "Operation `%s': no method found,%sargument %s%s%s%s",
1337 PL_AMG_names[method + assignshift],
1338 (flags & AMGf_unary ? " " : "\n\tleft "),
1340 "in overloaded package ":
1341 "has no overloaded magic",
1343 HvNAME(SvSTASH(SvRV(left))):
1346 ",\n\tright argument in overloaded package ":
1349 : ",\n\tright argument has no overloaded magic"),
1351 HvNAME(SvSTASH(SvRV(right))):
1353 if (amtp && amtp->fallback >= AMGfallYES) {
1354 DEBUG_o( deb("%s", SvPVX(msg)) );
1360 force_cpy = force_cpy || assign;
1365 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1367 method+assignshift==off? "" :
1369 method+assignshift==off? "" :
1370 PL_AMG_names[method+assignshift],
1371 method+assignshift==off? "" : "')",
1372 flags & AMGf_unary? "" :
1373 lr==1 ? " for right argument": " for left argument",
1374 flags & AMGf_unary? " for argument" : "",
1376 fl? ",\n\tassignment variant used": "") );
1378 /* Since we use shallow copy during assignment, we need
1379 * to dublicate the contents, probably calling user-supplied
1380 * version of copy operator
1382 /* We need to copy in following cases:
1383 * a) Assignment form was called.
1384 * assignshift==1, assign==T, method + 1 == off
1385 * b) Increment or decrement, called directly.
1386 * assignshift==0, assign==0, method + 0 == off
1387 * c) Increment or decrement, translated to assignment add/subtr.
1388 * assignshift==0, assign==T,
1390 * d) Increment or decrement, translated to nomethod.
1391 * assignshift==0, assign==0,
1393 * e) Assignment form translated to nomethod.
1394 * assignshift==1, assign==T, method + 1 != off
1397 /* off is method, method+assignshift, or a result of opcode substitution.
1398 * In the latter case assignshift==0, so only notfound case is important.
1400 if (( (method + assignshift == off)
1401 && (assign || (method == inc_amg) || (method == dec_amg)))
1408 bool oldcatch = CATCH_GET;
1411 Zero(&myop, 1, BINOP);
1412 myop.op_last = (OP *) &myop;
1413 myop.op_next = Nullop;
1414 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1416 PUSHSTACKi(PERLSI_OVERLOAD);
1419 PL_op = (OP *) &myop;
1420 if (PERLDB_SUB && PL_curstash != PL_debstash)
1421 PL_op->op_private |= OPpENTERSUB_DB;
1425 EXTEND(SP, notfound + 5);
1426 PUSHs(lr>0? right: left);
1427 PUSHs(lr>0? left: right);
1428 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1430 PUSHs( sv_2mortal(newSVpv((char *)PL_AMG_names[method + assignshift],0)));
1435 if (PL_op = pp_entersub(ARGS))
1443 CATCH_SET(oldcatch);
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 ans=SvIV(res)!=0; break;
1468 SvSetSV(left,res); return left;
1470 ans=!SvOK(res); break;
1473 } else if (method==copy_amg) {
1475 croak("Copy method did not return a reference");
1477 return SvREFCNT_inc(SvRV(res));
1483 #endif /* OVERLOAD */