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)));
128 #endif /* USE_THREADS */
130 sv_setpv((SV*)GvCV(gv), proto);
137 gv_init_sv(GV *gv, I32 sv_type)
153 gv_fetchmeth(HV *stash, char *name, STRLEN len, I32 level)
163 if ((level > 100) || (level < -100))
164 croak("Recursive inheritance detected while looking for method '%s' in package '%s'",
165 name, HvNAME(stash));
167 DEBUG_o( deb("Looking for method %s in package %s\n",name,HvNAME(stash)) );
169 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
174 if (SvTYPE(topgv) != SVt_PVGV)
175 gv_init(topgv, stash, name, len, TRUE);
176 if (cv = GvCV(topgv)) {
177 /* If genuine method or valid cache entry, use it */
178 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
180 /* Stale cached entry: junk it */
182 GvCV(topgv) = cv = Nullcv;
185 else if (GvCVGEN(topgv) == PL_sub_generation)
186 return 0; /* cache indicates sub doesn't exist */
189 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
190 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
192 /* create and re-create @.*::SUPER::ISA on demand */
193 if (!av || !SvMAGIC(av)) {
194 char* packname = HvNAME(stash);
195 STRLEN packlen = strlen(packname);
197 if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
201 basestash = gv_stashpvn(packname, packlen, TRUE);
202 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
203 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
204 dTHR; /* just for SvREFCNT_dec */
205 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
206 if (!gvp || !(gv = *gvp))
207 croak("Cannot create %s::ISA", HvNAME(stash));
208 if (SvTYPE(gv) != SVt_PVGV)
209 gv_init(gv, stash, "ISA", 3, TRUE);
210 SvREFCNT_dec(GvAV(gv));
211 GvAV(gv) = (AV*)SvREFCNT_inc(av);
217 SV** svp = AvARRAY(av);
218 /* NOTE: No support for tied ISA */
219 I32 items = AvFILLp(av) + 1;
222 HV* basestash = gv_stashsv(sv, FALSE);
224 dTHR; /* just for ckWARN */
225 if (ckWARN(WARN_MISC))
226 warner(WARN_MISC, "Can't locate package %s for @%s::ISA",
227 SvPVX(sv), HvNAME(stash));
230 gv = gv_fetchmeth(basestash, name, len,
231 (level >= 0) ? level + 1 : level - 1);
237 /* if at top level, try UNIVERSAL */
239 if (level == 0 || level == -1) {
242 if (lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE)) {
243 if (gv = gv_fetchmeth(lastchance, name, len,
244 (level >= 0) ? level + 1 : level - 1)) {
247 * Cache method in topgv if:
248 * 1. topgv has no synonyms (else inheritance crosses wires)
249 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
252 GvREFCNT(topgv) == 1 &&
254 (CvROOT(cv) || CvXSUB(cv)))
256 if (cv = GvCV(topgv))
258 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
259 GvCVGEN(topgv) = PL_sub_generation;
263 else if (topgv && GvREFCNT(topgv) == 1) {
264 /* cache the fact that the method is not defined */
265 GvCVGEN(topgv) = PL_sub_generation;
274 gv_fetchmethod(HV *stash, char *name)
276 return gv_fetchmethod_autoload(stash, name, TRUE);
280 gv_fetchmethod_autoload(HV *stash, char *name, I32 autoload)
287 for (nend = name; *nend; nend++) {
290 else if (*nend == ':' && *(nend + 1) == ':')
294 char *origname = name;
298 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
299 /* ->SUPER::method should really be looked up in original stash */
300 SV *tmpstr = sv_2mortal(newSVpvf("%s::SUPER",
301 HvNAME(PL_curcop->cop_stash)));
302 stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
303 DEBUG_o( deb("Treating %s as %s::%s\n",
304 origname, HvNAME(stash), name) );
307 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
310 gv = gv_fetchmeth(stash, name, nend - name, 0);
312 if (strEQ(name,"import"))
313 gv = (GV*)&PL_sv_yes;
315 gv = gv_autoload4(stash, name, nend - name, TRUE);
319 if (!CvROOT(cv) && !CvXSUB(cv)) {
327 if (GvCV(stubgv) != cv) /* orphaned import */
330 autogv = gv_autoload4(GvSTASH(stubgv),
331 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
341 gv_autoload4(HV *stash, char *name, STRLEN len, I32 method)
344 static char autoload[] = "AUTOLOAD";
345 static STRLEN autolen = 8;
352 if (len == autolen && strnEQ(name, autoload, autolen))
354 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
359 * Inheriting AUTOLOAD for non-methods works ... for now.
361 if (ckWARN(WARN_DEPRECATED) && !method &&
362 (GvCVGEN(gv) || GvSTASH(gv) != stash))
363 warner(WARN_DEPRECATED,
364 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
365 HvNAME(stash), (int)len, name);
368 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
369 * The subroutine's original name may not be "AUTOLOAD", so we don't
370 * use that, but for lack of anything better we will use the sub's
371 * original package to look up $AUTOLOAD.
373 varstash = GvSTASH(CvGV(cv));
374 vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
376 gv_init(vargv, varstash, autoload, autolen, FALSE);
378 sv_setpv(varsv, HvNAME(stash));
379 sv_catpvn(varsv, "::", 2);
380 sv_catpvn(varsv, name, len);
381 SvTAINTED_off(varsv);
386 gv_stashpv(char *name, I32 create)
388 return gv_stashpvn(name, strlen(name), create);
392 gv_stashpvn(char *name, U32 namelen, I32 create)
399 if (namelen + 3 < sizeof smallbuf)
402 New(606, tmpbuf, namelen + 3, char);
403 Copy(name,tmpbuf,namelen,char);
404 tmpbuf[namelen++] = ':';
405 tmpbuf[namelen++] = ':';
406 tmpbuf[namelen] = '\0';
407 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
408 if (tmpbuf != smallbuf)
413 GvHV(tmpgv) = newHV();
416 HvNAME(stash) = savepv(name);
421 gv_stashsv(SV *sv, I32 create)
426 return gv_stashpvn(ptr, len, create);
431 gv_fetchpv(char *nambeg, I32 add, I32 sv_type)
434 register char *name = nambeg;
438 register char *namend;
442 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
445 for (namend = name; *namend; namend++) {
446 if ((*namend == '\'' && namend[1]) ||
447 (*namend == ':' && namend[1] == ':'))
451 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
459 if (len + 3 < sizeof smallbuf)
462 New(601, tmpbuf, len+3, char);
463 Copy(name, tmpbuf, len, char);
467 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
468 gv = gvp ? *gvp : Nullgv;
469 if (gv && gv != (GV*)&PL_sv_undef) {
470 if (SvTYPE(gv) != SVt_PVGV)
471 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
475 if (tmpbuf != smallbuf)
477 if (!gv || gv == (GV*)&PL_sv_undef)
480 if (!(stash = GvHV(gv)))
481 stash = GvHV(gv) = newHV();
484 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
492 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
499 /* No stash in name, so see how we can default */
502 if (isIDFIRST(*name)) {
505 if (isUPPER(*name)) {
506 if (*name == 'S' && (
507 strEQ(name, "SIG") ||
508 strEQ(name, "STDIN") ||
509 strEQ(name, "STDOUT") ||
510 strEQ(name, "STDERR")))
512 else if (*name == 'I' && strEQ(name, "INC"))
514 else if (*name == 'E' && strEQ(name, "ENV"))
516 else if (*name == 'A' && (
517 strEQ(name, "ARGV") ||
518 strEQ(name, "ARGVOUT")))
521 else if (*name == '_' && !name[1])
526 else if ((COP*)PL_curcop == &PL_compiling) {
528 if (add && (PL_hints & HINT_STRICT_VARS) &&
529 sv_type != SVt_PVCV &&
530 sv_type != SVt_PVGV &&
531 sv_type != SVt_PVFM &&
532 sv_type != SVt_PVIO &&
533 !(len == 1 && sv_type == SVt_PV && strchr("ab",*name)) )
535 gvp = (GV**)hv_fetch(stash,name,len,0);
537 *gvp == (GV*)&PL_sv_undef ||
538 SvTYPE(*gvp) != SVt_PVGV)
542 else if (sv_type == SVt_PV && !GvIMPORTED_SV(*gvp) ||
543 sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp) ||
544 sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp) )
546 warn("Variable \"%c%s\" is not imported",
547 sv_type == SVt_PVAV ? '@' :
548 sv_type == SVt_PVHV ? '%' : '$',
551 warn("(Did you mean &%s instead?)\n", name);
557 stash = PL_curcop->cop_stash;
563 /* By this point we should have a stash and a name */
568 if (add & ~GV_ADDMULTI) {
569 char sv_type_char = ((sv_type == SVt_PV) ? '$'
570 : (sv_type == SVt_PVAV) ? '@'
571 : (sv_type == SVt_PVHV) ? '%'
574 warn("Global symbol \"%c%s\" requires explicit package name",
577 warn("Global symbol \"%s\" requires explicit package name",
581 stash = PL_curstash ? PL_curstash : PL_defstash; /* avoid core dumps */
582 add_gvflags = ((sv_type == SVt_PV) ? GVf_IMPORTED_SV
583 : (sv_type == SVt_PVAV) ? GVf_IMPORTED_AV
584 : (sv_type == SVt_PVHV) ? GVf_IMPORTED_HV
588 if (!SvREFCNT(stash)) /* symbol table under destruction */
591 gvp = (GV**)hv_fetch(stash,name,len,add);
592 if (!gvp || *gvp == (GV*)&PL_sv_undef)
595 if (SvTYPE(gv) == SVt_PVGV) {
598 gv_init_sv(gv, sv_type);
601 } else if (add & GV_NOINIT) {
605 /* Adding a new symbol */
607 if (add & GV_ADDWARN)
608 warn("Had to create %s unexpectedly", nambeg);
609 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
610 gv_init_sv(gv, sv_type);
611 GvFLAGS(gv) |= add_gvflags;
613 /* set up magic where warranted */
616 if (strEQ(name, "ARGV")) {
617 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
627 if (strnEQ(name, "EXPORT", 6))
631 if (strEQ(name, "ISA")) {
634 sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
635 /* NOTE: No support for tied ISA */
636 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
637 && AvFILLp(av) == -1)
640 av_push(av, newSVpv(pname = "NDBM_File",0));
641 gv_stashpvn(pname, 9, TRUE);
642 av_push(av, newSVpv(pname = "DB_File",0));
643 gv_stashpvn(pname, 7, TRUE);
644 av_push(av, newSVpv(pname = "GDBM_File",0));
645 gv_stashpvn(pname, 9, TRUE);
646 av_push(av, newSVpv(pname = "SDBM_File",0));
647 gv_stashpvn(pname, 9, TRUE);
648 av_push(av, newSVpv(pname = "ODBM_File",0));
649 gv_stashpvn(pname, 9, TRUE);
655 if (strEQ(name, "OVERLOAD")) {
658 hv_magic(hv, gv, 'A');
661 #endif /* OVERLOAD */
663 if (strEQ(name, "SIG")) {
667 GvMULTI_on(PL_siggv);
668 hv = GvHVn(PL_siggv);
669 hv_magic(hv, PL_siggv, 'S');
670 for(i=1;sig_name[i];i++) {
672 init=hv_fetch(hv,sig_name[i],strlen(sig_name[i]),1);
674 sv_setsv(*init,&PL_sv_undef);
685 PL_sawampersand = TRUE;
692 PL_sawampersand = TRUE;
699 PL_sawampersand = TRUE;
705 sv_setpv(GvSV(gv),PL_chopset);
711 #ifdef COMPLEX_STATUS
712 sv_upgrade(GvSV(gv), SVt_PVLV);
719 if (sv_type > SVt_PV && PL_curcop != &PL_compiling) {
720 HV* stash = gv_stashpvn("Errno",5,FALSE);
721 if(!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
724 perl_require_pv("Errno.pm");
726 stash = gv_stashpvn("Errno",5,FALSE);
727 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
728 croak("Can't use %%! because Errno.pm is not available");
737 sv_magic((SV*)av, Nullsv, 'D', Nullch, 0);
742 if (ckWARN(WARN_DEPRECATED) && len == 1 && sv_type == SVt_PV)
743 warner(WARN_DEPRECATED, "Use of $%s is deprecated", name);
765 case '\011': /* NOT \t in EBCDIC */
783 sv_magic((SV*)av, (SV*)av, 'D', Nullch, 0);
796 SvREADONLY_on(GvSV(gv));
798 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
804 sv_setpv(GvSV(gv),"\f");
805 PL_formfeed = GvSV(gv);
810 sv_setpv(GvSV(gv),"\034");
815 sv_upgrade(sv, SVt_PVNV);
816 sv_setpv(sv, PL_patchlevel);
826 gv_fullname3(SV *sv, GV *gv, char *prefix)
828 HV *hv = GvSTASH(gv);
833 sv_setpv(sv, prefix ? prefix : "");
834 sv_catpv(sv,HvNAME(hv));
835 sv_catpvn(sv,"::", 2);
836 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
840 gv_efullname3(SV *sv, GV *gv, char *prefix)
845 gv_fullname3(sv, egv, prefix);
848 /* XXX compatibility with versions <= 5.003. */
850 gv_fullname(SV *sv, GV *gv)
852 gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
855 /* XXX compatibility with versions <= 5.003. */
857 gv_efullname(SV *sv, GV *gv)
859 gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
869 io = (IO*)NEWSV(0,0);
870 sv_upgrade((SV *)io,SVt_PVIO);
873 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
875 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
876 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
892 for (i = 0; i <= (I32) HvMAX(stash); i++) {
893 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
894 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
895 (gv = (GV*)HeVAL(entry)) && (hv = GvHV(gv)) && HvNAME(hv))
897 if (hv != PL_defstash)
898 gv_check(hv); /* nested package */
900 else if (isALPHA(*HeKEY(entry))) {
901 gv = (GV*)HeVAL(entry);
902 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
904 PL_curcop->cop_line = GvLINE(gv);
905 filegv = GvFILEGV(gv);
906 PL_curcop->cop_filegv = filegv;
907 if (filegv && GvMULTI(filegv)) /* Filename began with slash */
910 "Name \"%s::%s\" used only once: possible typo",
911 HvNAME(stash), GvNAME(gv));
920 return gv_fetchpv(form("%s::_GEN_%ld", pack, (long)PL_gensym++),
924 /* hopefully this is only called on local symbol table entries */
932 /* multi-named GPs cannot be used for method cache */
933 SvREFCNT_dec(gp->gp_cv);
938 /* Adding a new name to a subroutine invalidates method cache */
951 if (!gv || !(gp = GvGP(gv)))
953 if (gp->gp_refcnt == 0) {
954 warn("Attempt to free unreferenced glob pointers");
958 /* Deleting the name of a subroutine invalidates method cache */
961 if (--gp->gp_refcnt > 0) {
962 if (gp->gp_egv == gv)
967 SvREFCNT_dec(gp->gp_sv);
968 SvREFCNT_dec(gp->gp_av);
969 SvREFCNT_dec(gp->gp_hv);
970 SvREFCNT_dec(gp->gp_io);
971 SvREFCNT_dec(gp->gp_cv);
972 SvREFCNT_dec(gp->gp_form);
978 #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
982 #ifdef MICROPORT /* Microport 2.4 hack */
987 return GvGP(gv)->gp_av;
989 return GvGP(gv_AVadd(gv))->gp_av;
996 return GvGP(gv)->gp_hv;
998 return GvGP(gv_HVadd(gv))->gp_hv;
1000 #endif /* Microport 2.4 hack */
1003 /* Updates and caches the CV's */
1006 Gv_AMupdate(HV *stash)
1013 MAGIC* mg=mg_find((SV*)stash,'c');
1014 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
1017 if (mg && amtp->was_ok_am == PL_amagic_generation
1018 && amtp->was_ok_sub == PL_sub_generation)
1019 return AMT_AMAGIC(amtp);
1020 if (amtp && AMT_AMAGIC(amtp)) { /* Have table. */
1022 for (i=1; i<NofAMmeth; i++) {
1023 if (amtp->table[i]) {
1024 SvREFCNT_dec(amtp->table[i]);
1028 sv_unmagic((SV*)stash, 'c');
1030 DEBUG_o( deb("Recalcing overload magic in package %s\n",HvNAME(stash)) );
1032 amt.was_ok_am = PL_amagic_generation;
1033 amt.was_ok_sub = PL_sub_generation;
1034 amt.fallback = AMGfallNO;
1037 #ifdef OVERLOAD_VIA_HASH
1038 gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE); /* A shortcut */
1039 if (gvp && ((gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv)))) {
1046 /* Work with "fallback" key, which we assume to be first in AMG_names */
1048 if (( cp = (char *)AMG_names[0] ) &&
1049 (svp = (SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
1050 if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1051 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1053 for (i = 1; i < NofAMmeth; i++) {
1055 cp = (char *)AMG_names[i];
1057 svp = (SV**)hv_fetch(hv, cp, strlen(cp), FALSE);
1058 if (svp && ((sv = *svp) != &PL_sv_undef)) {
1059 switch (SvTYPE(sv)) {
1062 if (!SvOK(sv)) break;
1063 gv = gv_fetchmethod(stash, SvPV(sv, PL_na));
1064 if (gv) cv = GvCV(gv);
1068 if (SvTYPE(cv) == SVt_PVCV)
1073 croak("Not a subroutine reference in overload table");
1079 if (!(cv = GvCVu((GV*)sv)))
1080 cv = sv_2cv(sv, &stash, &gv, TRUE);
1085 croak("Method for operation %s not found in package %.256s during blessing\n",
1098 /* Work with "fallback" key, which we assume to be first in AMG_names */
1100 if ( cp = AMG_names[0] ) {
1101 /* Try to find via inheritance. */
1102 gv = gv_fetchmeth(stash, "()", 2, -1); /* A cookie: "()". */
1103 if (gv) sv = GvSV(gv);
1105 if (!gv) goto no_table;
1106 else if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1107 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1110 for (i = 1; i < NofAMmeth; i++) {
1111 SV *cookie = sv_2mortal(newSVpvf("(%s", cp = AMG_names[i]));
1112 DEBUG_o( deb("Checking overloading of `%s' in package `%.256s'\n",
1113 cp, HvNAME(stash)) );
1114 /* don't fill the cache while looking up! */
1115 gv = gv_fetchmeth(stash, SvPVX(cookie), SvCUR(cookie), -1);
1117 if(gv && (cv = GvCV(gv))) {
1118 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1119 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1120 /* GvSV contains the name of the method. */
1123 DEBUG_o( deb("Resolving method `%.256s' for overloaded `%s' in package `%.256s'\n",
1124 SvPV(GvSV(gv), PL_na), cp, HvNAME(stash)) );
1125 if (!SvPOK(GvSV(gv))
1126 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1129 /* Can be an import stub (created by `can'). */
1131 croak("Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'",
1132 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1135 croak("Cannot resolve method `%.256s' overloading `%s' in package `%.256s'",
1136 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1139 cv = GvCV(gv = ngv);
1141 DEBUG_o( deb("Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1142 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1143 GvNAME(CvGV(cv))) );
1147 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1150 AMT_AMAGIC_on(&amt);
1151 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMT));
1155 /* Here we have no table: */
1157 AMT_AMAGIC_off(&amt);
1158 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMTS));
1163 amagic_call(SV *left, SV *right, int method, int flags)
1168 CV **cvp=NULL, **ocvp=NULL;
1170 int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1171 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1173 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1174 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
1175 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1176 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1178 && ((cv = cvp[off=method+assignshift])
1179 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1181 (fl = 1, cv = cvp[off=method])))) {
1182 lr = -1; /* Call method for left argument */
1184 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1187 /* look for substituted methods */
1188 /* In all the covered cases we should be called with assign==0. */
1192 if ((cv = cvp[off=add_ass_amg])
1193 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1194 right = &PL_sv_yes; lr = -1; assign = 1;
1199 if ((cv = cvp[off = subtr_ass_amg])
1200 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1201 right = &PL_sv_yes; lr = -1; assign = 1;
1205 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1208 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1211 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1214 (void)((cv = cvp[off=bool__amg])
1215 || (cv = cvp[off=numer_amg])
1216 || (cv = cvp[off=string_amg]));
1222 * SV* ref causes confusion with the interpreter variable of
1225 SV* tmpRef=SvRV(left);
1226 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1228 * Just to be extra cautious. Maybe in some
1229 * additional cases sv_setsv is safe, too.
1231 SV* newref = newSVsv(tmpRef);
1232 SvOBJECT_on(newref);
1233 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
1239 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1240 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1241 SV* nullsv=sv_2mortal(newSViv(0));
1243 SV* lessp = amagic_call(left,nullsv,
1244 lt_amg,AMGf_noright);
1245 logic = SvTRUE(lessp);
1247 SV* lessp = amagic_call(left,nullsv,
1248 ncmp_amg,AMGf_noright);
1249 logic = (SvNV(lessp) < 0);
1252 if (off==subtr_amg) {
1263 if (cv = cvp[off=subtr_amg]) {
1265 left = sv_2mortal(newSViv(0));
1272 if (!cv) goto not_found;
1273 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1274 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
1275 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1276 ? (amtp = (AMT*)mg->mg_ptr)->table
1278 && (cv = cvp[off=method])) { /* Method for right
1281 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1282 && (cvp=ocvp) && (lr = -1))
1283 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1284 && !(flags & AMGf_unary)) {
1285 /* We look for substitution for
1286 * comparison operations and
1288 if (method==concat_amg || method==concat_ass_amg
1289 || method==repeat_amg || method==repeat_ass_amg) {
1290 return NULL; /* Delegate operation to string conversion */
1300 postpr = 1; off=ncmp_amg; break;
1307 postpr = 1; off=scmp_amg; break;
1309 if (off != -1) cv = cvp[off];
1314 not_found: /* No method found, either report or croak */
1315 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1316 notfound = 1; lr = -1;
1317 } else if (cvp && (cv=cvp[nomethod_amg])) {
1318 notfound = 1; lr = 1;
1321 if (off==-1) off=method;
1322 msg = sv_2mortal(newSVpvf(
1323 "Operation `%s': no method found,%sargument %s%s%s%s",
1324 AMG_names[method + assignshift],
1325 (flags & AMGf_unary ? " " : "\n\tleft "),
1327 "in overloaded package ":
1328 "has no overloaded magic",
1330 HvNAME(SvSTASH(SvRV(left))):
1333 ",\n\tright argument in overloaded package ":
1336 : ",\n\tright argument has no overloaded magic"),
1338 HvNAME(SvSTASH(SvRV(right))):
1340 if (amtp && amtp->fallback >= AMGfallYES) {
1341 DEBUG_o( deb("%s", SvPVX(msg)) );
1347 force_cpy = force_cpy || assign;
1352 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1354 method+assignshift==off? "" :
1356 method+assignshift==off? "" :
1357 AMG_names[method+assignshift],
1358 method+assignshift==off? "" : "')",
1359 flags & AMGf_unary? "" :
1360 lr==1 ? " for right argument": " for left argument",
1361 flags & AMGf_unary? " for argument" : "",
1363 fl? ",\n\tassignment variant used": "") );
1365 /* Since we use shallow copy during assignment, we need
1366 * to dublicate the contents, probably calling user-supplied
1367 * version of copy operator
1369 /* We need to copy in following cases:
1370 * a) Assignment form was called.
1371 * assignshift==1, assign==T, method + 1 == off
1372 * b) Increment or decrement, called directly.
1373 * assignshift==0, assign==0, method + 0 == off
1374 * c) Increment or decrement, translated to assignment add/subtr.
1375 * assignshift==0, assign==T,
1377 * d) Increment or decrement, translated to nomethod.
1378 * assignshift==0, assign==0,
1380 * e) Assignment form translated to nomethod.
1381 * assignshift==1, assign==T, method + 1 != off
1384 /* off is method, method+assignshift, or a result of opcode substitution.
1385 * In the latter case assignshift==0, so only notfound case is important.
1387 if (( (method + assignshift == off)
1388 && (assign || (method == inc_amg) || (method == dec_amg)))
1395 bool oldcatch = CATCH_GET;
1398 Zero(&myop, 1, BINOP);
1399 myop.op_last = (OP *) &myop;
1400 myop.op_next = Nullop;
1401 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1403 PUSHSTACKi(PERLSI_OVERLOAD);
1406 PL_op = (OP *) &myop;
1407 if (PERLDB_SUB && PL_curstash != PL_debstash)
1408 PL_op->op_private |= OPpENTERSUB_DB;
1412 EXTEND(SP, notfound + 5);
1413 PUSHs(lr>0? right: left);
1414 PUSHs(lr>0? left: right);
1415 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1417 PUSHs( sv_2mortal(newSVpv((char *)AMG_names[method + assignshift],0)) );
1422 if (PL_op = pp_entersub(ARGS))
1429 CATCH_SET(oldcatch);
1436 ans=SvIV(res)<=0; break;
1439 ans=SvIV(res)<0; break;
1442 ans=SvIV(res)>=0; break;
1445 ans=SvIV(res)>0; break;
1448 ans=SvIV(res)==0; break;
1451 ans=SvIV(res)!=0; break;
1454 SvSetSV(left,res); return left;
1456 ans=!SvOK(res); break;
1459 } else if (method==copy_amg) {
1461 croak("Copy method did not return a reference");
1463 return SvREFCNT_inc(SvRV(res));
1469 #endif /* OVERLOAD */