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,'
25 gv_AVadd(register GV *gv)
27 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
28 croak("Bad symbol for array");
35 gv_HVadd(register GV *gv)
37 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
38 croak("Bad symbol for hash");
45 gv_IOadd(register GV *gv)
47 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
48 croak("Bad symbol for filehandle");
55 gv_fetchfile(char *name)
63 tmplen = strlen(name) + 2;
64 if (tmplen < sizeof smallbuf)
67 New(603, tmpbuf, tmplen + 1, char);
70 strcpy(tmpbuf + 2, name);
71 gv = *(GV**)hv_fetch(defstash, tmpbuf, tmplen, TRUE);
73 gv_init(gv, defstash, tmpbuf, tmplen, FALSE);
74 if (tmpbuf != smallbuf)
76 sv_setpv(GvSV(gv), name);
77 if (*name == '/' && (instr(name, "/lib/") || instr(name, ".pm")))
80 hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
85 gv_init(GV *gv, HV *stash, char *name, STRLEN len, int multi)
89 bool doproto = SvTYPE(gv) > SVt_NULL;
90 char *proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
92 sv_upgrade((SV*)gv, SVt_PVGV);
101 Newz(602, gp, 1, GP);
102 GvGP(gv) = gp_ref(gp);
103 GvSV(gv) = NEWSV(72,0);
104 GvLINE(gv) = curcop->cop_line;
105 GvFILEGV(gv) = curcop->cop_filegv;
107 sv_magic((SV*)gv, (SV*)gv, '*', name, len);
108 GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
109 GvNAME(gv) = savepvn(name, len);
113 if (doproto) { /* Replicate part of newSUB here. */
116 start_subparse(0,0); /* Create CV in compcv. */
122 CvGV(GvCV(gv)) = (GV*)SvREFCNT_inc(gv);
123 CvFILEGV(GvCV(gv)) = curcop->cop_filegv;
124 CvSTASH(GvCV(gv)) = curstash;
126 CvOWNER(GvCV(gv)) = 0;
127 New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex);
128 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) >= sub_generation)
181 /* Stale cached entry: junk it */
183 GvCV(topgv) = cv = Nullcv;
188 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
189 av = (gvp && (gv = *gvp) && gv != (GV*)&sv_undef) ? GvAV(gv) : Nullav;
191 /* create and re-create @.*::SUPER::ISA on demand */
192 if (!av || !SvMAGIC(av)) {
193 char* packname = HvNAME(stash);
194 STRLEN packlen = strlen(packname);
196 if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
200 basestash = gv_stashpvn(packname, packlen, TRUE);
201 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
202 if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
203 dTHR; /* just for SvREFCNT_dec */
204 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
205 if (!gvp || !(gv = *gvp))
206 croak("Cannot create %s::ISA", HvNAME(stash));
207 if (SvTYPE(gv) != SVt_PVGV)
208 gv_init(gv, stash, "ISA", 3, TRUE);
209 SvREFCNT_dec(GvAV(gv));
210 GvAV(gv) = (AV*)SvREFCNT_inc(av);
216 SV** svp = AvARRAY(av);
217 /* NOTE: No support for tied ISA */
218 I32 items = AvFILLp(av) + 1;
221 HV* basestash = gv_stashsv(sv, FALSE);
224 warn("Can't locate package %s for @%s::ISA",
225 SvPVX(sv), HvNAME(stash));
228 gv = gv_fetchmeth(basestash, name, len,
229 (level >= 0) ? level + 1 : level - 1);
235 /* if at top level, try UNIVERSAL */
237 if (level == 0 || level == -1) {
240 if (lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE)) {
241 if (gv = gv_fetchmeth(lastchance, name, len,
242 (level >= 0) ? level + 1 : level - 1)) {
245 * Cache method in topgv if:
246 * 1. topgv has no synonyms (else inheritance crosses wires)
247 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
250 GvREFCNT(topgv) == 1 &&
252 (CvROOT(cv) || CvXSUB(cv)))
254 if (cv = GvCV(topgv))
256 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
257 GvCVGEN(topgv) = sub_generation;
268 gv_fetchmethod(HV *stash, char *name)
270 return gv_fetchmethod_autoload(stash, name, TRUE);
274 gv_fetchmethod_autoload(HV *stash, char *name, I32 autoload)
281 for (nend = name; *nend; nend++) {
284 else if (*nend == ':' && *(nend + 1) == ':')
288 char *origname = name;
292 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
293 /* ->SUPER::method should really be looked up in original stash */
294 SV *tmpstr = sv_2mortal(newSVpvf("%s::SUPER",
295 HvNAME(curcop->cop_stash)));
296 stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
297 DEBUG_o( deb("Treating %s as %s::%s\n",
298 origname, HvNAME(stash), name) );
301 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
304 gv = gv_fetchmeth(stash, name, nend - name, 0);
306 if (strEQ(name,"import"))
309 gv = gv_autoload4(stash, name, nend - name, TRUE);
313 if (!CvROOT(cv) && !CvXSUB(cv)) {
321 if (GvCV(stubgv) != cv) /* orphaned import */
324 autogv = gv_autoload4(GvSTASH(stubgv),
325 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
335 gv_autoload4(HV *stash, char *name, STRLEN len, I32 method)
337 static char autoload[] = "AUTOLOAD";
338 static STRLEN autolen = 8;
345 if (len == autolen && strnEQ(name, autoload, autolen))
347 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
352 * Inheriting AUTOLOAD for non-methods works ... for now.
354 if (dowarn && !method && (GvCVGEN(gv) || GvSTASH(gv) != stash))
356 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
357 HvNAME(stash), (int)len, name);
360 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
361 * The subroutine's original name may not be "AUTOLOAD", so we don't
362 * use that, but for lack of anything better we will use the sub's
363 * original package to look up $AUTOLOAD.
365 varstash = GvSTASH(CvGV(cv));
366 vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
368 gv_init(vargv, varstash, autoload, autolen, FALSE);
370 sv_setpv(varsv, HvNAME(stash));
371 sv_catpvn(varsv, "::", 2);
372 sv_catpvn(varsv, name, len);
373 SvTAINTED_off(varsv);
378 gv_stashpv(char *name, I32 create)
380 return gv_stashpvn(name, strlen(name), create);
384 gv_stashpvn(char *name, U32 namelen, I32 create)
391 if (namelen + 3 < sizeof smallbuf)
394 New(606, tmpbuf, namelen + 3, char);
395 Copy(name,tmpbuf,namelen,char);
396 tmpbuf[namelen++] = ':';
397 tmpbuf[namelen++] = ':';
398 tmpbuf[namelen] = '\0';
399 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
400 if (tmpbuf != smallbuf)
405 GvHV(tmpgv) = newHV();
408 HvNAME(stash) = savepv(name);
413 gv_stashsv(SV *sv, I32 create)
418 return gv_stashpvn(ptr, len, create);
423 gv_fetchpv(char *nambeg, I32 add, I32 sv_type)
426 register char *name = nambeg;
430 register char *namend;
434 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
437 for (namend = name; *namend; namend++) {
438 if ((*namend == '\'' && namend[1]) ||
439 (*namend == ':' && namend[1] == ':'))
443 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
451 if (len + 3 < sizeof smallbuf)
454 New(601, tmpbuf, len+3, char);
455 Copy(name, tmpbuf, len, char);
459 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
460 gv = gvp ? *gvp : Nullgv;
461 if (gv && gv != (GV*)&sv_undef) {
462 if (SvTYPE(gv) != SVt_PVGV)
463 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
467 if (tmpbuf != smallbuf)
469 if (!gv || gv == (GV*)&sv_undef)
472 if (!(stash = GvHV(gv)))
473 stash = GvHV(gv) = newHV();
476 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
484 return gv ? gv : (GV*)*hv_fetch(defstash, "main::", 6, TRUE);
491 /* No stash in name, so see how we can default */
494 if (isIDFIRST(*name)) {
497 if (isUPPER(*name)) {
499 if (*name == 'S' && (
500 strEQ(name, "SIG") ||
501 strEQ(name, "STDIN") ||
502 strEQ(name, "STDOUT") ||
503 strEQ(name, "STDERR") ))
506 else if (*name > 'E') {
507 if (*name == 'I' && strEQ(name, "INC"))
510 else if (*name > 'A') {
511 if (*name == 'E' && strEQ(name, "ENV"))
514 else if (*name == 'A' && (
515 strEQ(name, "ARGV") ||
516 strEQ(name, "ARGVOUT") ))
519 else if (*name == '_' && !name[1])
524 else if ((COP*)curcop == &compiling) {
526 if (add && (hints & HINT_STRICT_VARS) &&
527 sv_type != SVt_PVCV &&
528 sv_type != SVt_PVGV &&
529 sv_type != SVt_PVFM &&
530 sv_type != SVt_PVIO &&
531 !(len == 1 && sv_type == SVt_PV && strchr("ab",*name)) )
533 gvp = (GV**)hv_fetch(stash,name,len,0);
535 *gvp == (GV*)&sv_undef ||
536 SvTYPE(*gvp) != SVt_PVGV)
540 else if (sv_type == SVt_PV && !GvIMPORTED_SV(*gvp) ||
541 sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp) ||
542 sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp) )
544 warn("Variable \"%c%s\" is not imported",
545 sv_type == SVt_PVAV ? '@' :
546 sv_type == SVt_PVHV ? '%' : '$',
549 warn("(Did you mean &%s instead?)\n", name);
555 stash = curcop->cop_stash;
561 /* By this point we should have a stash and a name */
566 if (add & ~GV_ADDMULTI) {
567 char sv_type_char = ((sv_type == SVt_PV) ? '$'
568 : (sv_type == SVt_PVAV) ? '@'
569 : (sv_type == SVt_PVHV) ? '%'
572 warn("Global symbol \"%c%s\" requires explicit package name",
575 warn("Global symbol \"%s\" requires explicit package name",
579 stash = curstash ? curstash : defstash; /* avoid core dumps */
580 add_gvflags = ((sv_type == SVt_PV) ? GVf_IMPORTED_SV
581 : (sv_type == SVt_PVAV) ? GVf_IMPORTED_AV
582 : (sv_type == SVt_PVHV) ? GVf_IMPORTED_HV
586 if (!SvREFCNT(stash)) /* symbol table under destruction */
589 gvp = (GV**)hv_fetch(stash,name,len,add);
590 if (!gvp || *gvp == (GV*)&sv_undef)
593 if (SvTYPE(gv) == SVt_PVGV) {
596 gv_init_sv(gv, sv_type);
599 } else if (add & GV_NOINIT) {
603 /* Adding a new symbol */
605 if (add & GV_ADDWARN)
606 warn("Had to create %s unexpectedly", nambeg);
607 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
608 gv_init_sv(gv, sv_type);
609 GvFLAGS(gv) |= add_gvflags;
611 /* set up magic where warranted */
614 if (strEQ(name, "ARGV")) {
615 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
625 if (strnEQ(name, "EXPORT", 6))
629 if (strEQ(name, "ISA")) {
632 sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
633 /* NOTE: No support for tied ISA */
634 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
635 && AvFILLp(av) == -1)
638 av_push(av, newSVpv(pname = "NDBM_File",0));
639 gv_stashpvn(pname, 9, TRUE);
640 av_push(av, newSVpv(pname = "DB_File",0));
641 gv_stashpvn(pname, 7, TRUE);
642 av_push(av, newSVpv(pname = "GDBM_File",0));
643 gv_stashpvn(pname, 9, TRUE);
644 av_push(av, newSVpv(pname = "SDBM_File",0));
645 gv_stashpvn(pname, 9, TRUE);
646 av_push(av, newSVpv(pname = "ODBM_File",0));
647 gv_stashpvn(pname, 9, TRUE);
653 if (strEQ(name, "OVERLOAD")) {
656 hv_magic(hv, gv, 'A');
659 #endif /* OVERLOAD */
661 if (strEQ(name, "SIG")) {
667 hv_magic(hv, siggv, 'S');
668 for(i=1;sig_name[i];i++) {
670 init=hv_fetch(hv,sig_name[i],strlen(sig_name[i]),1);
672 sv_setsv(*init,&sv_undef);
703 sv_setpv(GvSV(gv),chopset);
709 #ifdef COMPLEX_STATUS
710 sv_upgrade(GvSV(gv), SVt_PVLV);
717 if (sv_type > SVt_PV && curcop != &compiling) {
718 HV* stash = gv_stashpvn("Errno",5,FALSE);
719 if(!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
722 perl_require_pv("Errno.pm");
724 stash = gv_stashpvn("Errno",5,FALSE);
725 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
726 croak("Can't use %%! because Errno.pm is not available");
732 if (dowarn && len == 1 && sv_type == SVt_PV)
733 warn("Use of $%s is deprecated", name);
776 SvREADONLY_on(GvSV(gv));
778 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
784 sv_setpv(GvSV(gv),"\f");
790 sv_setpv(GvSV(gv),"\034");
795 sv_upgrade(sv, SVt_PVNV);
796 sv_setpv(sv, patchlevel);
806 gv_fullname3(SV *sv, GV *gv, char *prefix)
808 HV *hv = GvSTASH(gv);
813 sv_setpv(sv, prefix ? prefix : "");
814 sv_catpv(sv,HvNAME(hv));
815 sv_catpvn(sv,"::", 2);
816 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
820 gv_efullname3(SV *sv, GV *gv, char *prefix)
825 gv_fullname3(sv, egv, prefix);
828 /* XXX compatibility with versions <= 5.003. */
830 gv_fullname(SV *sv, GV *gv)
832 gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
835 /* XXX compatibility with versions <= 5.003. */
837 gv_efullname(SV *sv, GV *gv)
839 gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
849 io = (IO*)NEWSV(0,0);
850 sv_upgrade((SV *)io,SVt_PVIO);
853 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
855 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
856 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
872 for (i = 0; i <= (I32) HvMAX(stash); i++) {
873 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
874 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
875 (gv = (GV*)HeVAL(entry)) && (hv = GvHV(gv)) && HvNAME(hv))
878 gv_check(hv); /* nested package */
880 else if (isALPHA(*HeKEY(entry))) {
881 gv = (GV*)HeVAL(entry);
882 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
884 curcop->cop_line = GvLINE(gv);
885 filegv = GvFILEGV(gv);
886 curcop->cop_filegv = filegv;
887 if (filegv && GvMULTI(filegv)) /* Filename began with slash */
889 warn("Name \"%s::%s\" used only once: possible typo",
890 HvNAME(stash), GvNAME(gv));
899 return gv_fetchpv(form("%s::_GEN_%ld", pack, (long)gensym++),
903 /* hopefully this is only called on local symbol table entries */
911 /* multi-named GPs cannot be used for method cache */
912 SvREFCNT_dec(gp->gp_cv);
917 /* Adding a new name to a subroutine invalidates method cache */
930 if (!gv || !(gp = GvGP(gv)))
932 if (gp->gp_refcnt == 0) {
933 warn("Attempt to free unreferenced glob pointers");
937 /* Deleting the name of a subroutine invalidates method cache */
940 if (--gp->gp_refcnt > 0) {
941 if (gp->gp_egv == gv)
946 SvREFCNT_dec(gp->gp_sv);
947 SvREFCNT_dec(gp->gp_av);
948 SvREFCNT_dec(gp->gp_hv);
949 SvREFCNT_dec(gp->gp_io);
950 SvREFCNT_dec(gp->gp_cv);
951 SvREFCNT_dec(gp->gp_form);
957 #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
961 #ifdef MICROPORT /* Microport 2.4 hack */
966 return GvGP(gv)->gp_av;
968 return GvGP(gv_AVadd(gv))->gp_av;
975 return GvGP(gv)->gp_hv;
977 return GvGP(gv_HVadd(gv))->gp_hv;
979 #endif /* Microport 2.4 hack */
982 /* Updates and caches the CV's */
985 Gv_AMupdate(HV *stash)
992 MAGIC* mg=mg_find((SV*)stash,'c');
993 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
996 if (mg && amtp->was_ok_am == amagic_generation
997 && amtp->was_ok_sub == sub_generation)
998 return AMT_AMAGIC(amtp);
999 if (amtp && AMT_AMAGIC(amtp)) { /* Have table. */
1001 for (i=1; i<NofAMmeth; i++) {
1002 if (amtp->table[i]) {
1003 SvREFCNT_dec(amtp->table[i]);
1007 sv_unmagic((SV*)stash, 'c');
1009 DEBUG_o( deb("Recalcing overload magic in package %s\n",HvNAME(stash)) );
1011 amt.was_ok_am = amagic_generation;
1012 amt.was_ok_sub = sub_generation;
1013 amt.fallback = AMGfallNO;
1016 #ifdef OVERLOAD_VIA_HASH
1017 gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE); /* A shortcut */
1018 if (gvp && ((gv = *gvp) != (GV*)&sv_undef && (hv = GvHV(gv)))) {
1025 /* Work with "fallback" key, which we assume to be first in AMG_names */
1027 if (( cp = (char *)AMG_names[0] ) &&
1028 (svp = (SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
1029 if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1030 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1032 for (i = 1; i < NofAMmeth; i++) {
1034 cp = (char *)AMG_names[i];
1036 svp = (SV**)hv_fetch(hv, cp, strlen(cp), FALSE);
1037 if (svp && ((sv = *svp) != &sv_undef)) {
1038 switch (SvTYPE(sv)) {
1041 if (!SvOK(sv)) break;
1042 gv = gv_fetchmethod(stash, SvPV(sv, na));
1043 if (gv) cv = GvCV(gv);
1047 if (SvTYPE(cv) == SVt_PVCV)
1052 croak("Not a subroutine reference in overload table");
1058 if (!(cv = GvCVu((GV*)sv)))
1059 cv = sv_2cv(sv, &stash, &gv, TRUE);
1064 croak("Method for operation %s not found in package %.256s during blessing\n",
1077 /* Work with "fallback" key, which we assume to be first in AMG_names */
1079 if ( cp = AMG_names[0] ) {
1080 /* Try to find via inheritance. */
1081 gv = gv_fetchmeth(stash, "()", 2, -1); /* A cookie: "()". */
1082 if (gv) sv = GvSV(gv);
1084 if (!gv) goto no_table;
1085 else if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1086 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1089 for (i = 1; i < NofAMmeth; i++) {
1090 SV *cookie = sv_2mortal(newSVpvf("(%s", cp = AMG_names[i]));
1091 DEBUG_o( deb("Checking overloading of `%s' in package `%.256s'\n",
1092 cp, HvNAME(stash)) );
1093 /* don't fill the cache while looking up! */
1094 gv = gv_fetchmeth(stash, SvPVX(cookie), SvCUR(cookie), -1);
1096 if(gv && (cv = GvCV(gv))) {
1097 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1098 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1099 /* GvSV contains the name of the method. */
1102 DEBUG_o( deb("Resolving method `%.256s' for overloaded `%s' in package `%.256s'\n",
1103 SvPV(GvSV(gv), na), cp, HvNAME(stash)) );
1104 if (!SvPOK(GvSV(gv))
1105 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1108 /* Can be an import stub (created by `can'). */
1110 croak("Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'",
1111 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1114 croak("Cannot resolve method `%.256s' overloading `%s' in package `%.256s'",
1115 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1118 cv = GvCV(gv = ngv);
1120 DEBUG_o( deb("Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1121 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1122 GvNAME(CvGV(cv))) );
1126 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1129 AMT_AMAGIC_on(&amt);
1130 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMT));
1134 /* Here we have no table: */
1136 AMT_AMAGIC_off(&amt);
1137 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMTS));
1142 amagic_call(SV *left, SV *right, int method, int flags)
1147 CV **cvp=NULL, **ocvp=NULL;
1149 int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1150 int postpr=0, inc_dec_ass=0, assignshift=assign?1:0;
1152 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1153 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
1154 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1155 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1157 && ((cv = cvp[off=method+assignshift])
1158 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1160 (fl = 1, cv = cvp[off=method])))) {
1161 lr = -1; /* Call method for left argument */
1163 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1166 /* look for substituted methods */
1169 if (((cv = cvp[off=add_ass_amg]) && (inc_dec_ass=1))
1170 || ((cv = cvp[off=add_amg]) && (postpr=1))) {
1171 right = &sv_yes; lr = -1; assign = 1;
1175 if (((cv = cvp[off=subtr_ass_amg]) && (inc_dec_ass=1))
1176 || ((cv = cvp[off=subtr_amg]) && (postpr=1))) {
1177 right = &sv_yes; lr = -1; assign = 1;
1181 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1184 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1187 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1190 (void)((cv = cvp[off=bool__amg])
1191 || (cv = cvp[off=numer_amg])
1192 || (cv = cvp[off=string_amg]));
1198 * SV* ref causes confusion with the interpreter variable of
1201 SV* tmpRef=SvRV(left);
1202 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1204 * Just to be extra cautious. Maybe in some
1205 * additional cases sv_setsv is safe, too.
1207 SV* newref = newSVsv(tmpRef);
1208 SvOBJECT_on(newref);
1209 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
1215 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1216 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1217 SV* nullsv=sv_2mortal(newSViv(0));
1219 SV* lessp = amagic_call(left,nullsv,
1220 lt_amg,AMGf_noright);
1221 logic = SvTRUE(lessp);
1223 SV* lessp = amagic_call(left,nullsv,
1224 ncmp_amg,AMGf_noright);
1225 logic = (SvNV(lessp) < 0);
1228 if (off==subtr_amg) {
1239 if (cv = cvp[off=subtr_amg]) {
1241 left = sv_2mortal(newSViv(0));
1248 if (!cv) goto not_found;
1249 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1250 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
1251 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1252 ? (amtp = (AMT*)mg->mg_ptr)->table
1254 && (cv = cvp[off=method])) { /* Method for right
1257 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1258 && (cvp=ocvp) && (lr = -1))
1259 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1260 && !(flags & AMGf_unary)) {
1261 /* We look for substitution for
1262 * comparison operations and
1264 if (method==concat_amg || method==concat_ass_amg
1265 || method==repeat_amg || method==repeat_ass_amg) {
1266 return NULL; /* Delegate operation to string conversion */
1276 postpr = 1; off=ncmp_amg; break;
1283 postpr = 1; off=scmp_amg; break;
1285 if (off != -1) cv = cvp[off];
1290 not_found: /* No method found, either report or croak */
1291 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1292 notfound = 1; lr = -1;
1293 } else if (cvp && (cv=cvp[nomethod_amg])) {
1294 notfound = 1; lr = 1;
1297 if (off==-1) off=method;
1298 msg = sv_2mortal(newSVpvf(
1299 "Operation `%s': no method found,%sargument %s%s%s%s",
1300 AMG_names[method + assignshift],
1301 (flags & AMGf_unary ? " " : "\n\tleft "),
1303 "in overloaded package ":
1304 "has no overloaded magic",
1306 HvNAME(SvSTASH(SvRV(left))):
1309 ",\n\tright argument in overloaded package ":
1312 : ",\n\tright argument has no overloaded magic"),
1314 HvNAME(SvSTASH(SvRV(right))):
1316 if (amtp && amtp->fallback >= AMGfallYES) {
1317 DEBUG_o( deb("%s", SvPVX(msg)) );
1327 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1329 method+assignshift==off? "" :
1331 method+assignshift==off? "" :
1332 AMG_names[method+assignshift],
1333 method+assignshift==off? "" : "')",
1334 flags & AMGf_unary? "" :
1335 lr==1 ? " for right argument": " for left argument",
1336 flags & AMGf_unary? " for argument" : "",
1338 fl? ",\n\tassignment variant used": "") );
1339 /* Since we use shallow copy during assignment, we need
1340 * to dublicate the contents, probably calling user-supplied
1341 * version of copy operator
1343 if ((method + assignshift==off
1344 && (assign || method==inc_amg || method==dec_amg))
1345 || inc_dec_ass) RvDEEPCP(left);
1351 bool oldcatch = CATCH_GET;
1354 Zero(&myop, 1, BINOP);
1355 myop.op_last = (OP *) &myop;
1356 myop.op_next = Nullop;
1357 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1359 PUSHSTACKi(SI_OVERLOAD);
1363 if (PERLDB_SUB && curstash != debstash)
1364 op->op_private |= OPpENTERSUB_DB;
1368 EXTEND(SP, notfound + 5);
1369 PUSHs(lr>0? right: left);
1370 PUSHs(lr>0? left: right);
1371 PUSHs( lr > 0 ? &sv_yes : ( assign ? &sv_undef : &sv_no ));
1373 PUSHs( sv_2mortal(newSVpv((char *)AMG_names[method + assignshift],0)) );
1378 if (op = pp_entersub(ARGS))
1385 CATCH_SET(oldcatch);
1392 ans=SvIV(res)<=0; break;
1395 ans=SvIV(res)<0; break;
1398 ans=SvIV(res)>=0; break;
1401 ans=SvIV(res)>0; break;
1404 ans=SvIV(res)==0; break;
1407 ans=SvIV(res)!=0; break;
1410 SvSetSV(left,res); return left;
1412 ans=!SvOK(res); break;
1415 } else if (method==copy_amg) {
1417 croak("Copy method did not return a reference");
1419 return SvREFCNT_inc(SvRV(res));
1425 #endif /* OVERLOAD */