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);
225 warn("Can't locate package %s for @%s::ISA",
226 SvPVX(sv), HvNAME(stash));
229 gv = gv_fetchmeth(basestash, name, len,
230 (level >= 0) ? level + 1 : level - 1);
236 /* if at top level, try UNIVERSAL */
238 if (level == 0 || level == -1) {
241 if (lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE)) {
242 if (gv = gv_fetchmeth(lastchance, name, len,
243 (level >= 0) ? level + 1 : level - 1)) {
246 * Cache method in topgv if:
247 * 1. topgv has no synonyms (else inheritance crosses wires)
248 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
251 GvREFCNT(topgv) == 1 &&
253 (CvROOT(cv) || CvXSUB(cv)))
255 if (cv = GvCV(topgv))
257 GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
258 GvCVGEN(topgv) = PL_sub_generation;
262 else if (topgv && GvREFCNT(topgv) == 1) {
263 /* cache the fact that the method is not defined */
264 GvCVGEN(topgv) = PL_sub_generation;
273 gv_fetchmethod(HV *stash, char *name)
275 return gv_fetchmethod_autoload(stash, name, TRUE);
279 gv_fetchmethod_autoload(HV *stash, char *name, I32 autoload)
286 for (nend = name; *nend; nend++) {
289 else if (*nend == ':' && *(nend + 1) == ':')
293 char *origname = name;
297 if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
298 /* ->SUPER::method should really be looked up in original stash */
299 SV *tmpstr = sv_2mortal(newSVpvf("%s::SUPER",
300 HvNAME(PL_curcop->cop_stash)));
301 stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
302 DEBUG_o( deb("Treating %s as %s::%s\n",
303 origname, HvNAME(stash), name) );
306 stash = gv_stashpvn(origname, nsplit - origname, TRUE);
309 gv = gv_fetchmeth(stash, name, nend - name, 0);
311 if (strEQ(name,"import"))
312 gv = (GV*)&PL_sv_yes;
314 gv = gv_autoload4(stash, name, nend - name, TRUE);
318 if (!CvROOT(cv) && !CvXSUB(cv)) {
326 if (GvCV(stubgv) != cv) /* orphaned import */
329 autogv = gv_autoload4(GvSTASH(stubgv),
330 GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
340 gv_autoload4(HV *stash, char *name, STRLEN len, I32 method)
342 static char autoload[] = "AUTOLOAD";
343 static STRLEN autolen = 8;
350 if (len == autolen && strnEQ(name, autoload, autolen))
352 if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
357 * Inheriting AUTOLOAD for non-methods works ... for now.
359 if (PL_dowarn && !method && (GvCVGEN(gv) || GvSTASH(gv) != stash))
361 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
362 HvNAME(stash), (int)len, name);
365 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
366 * The subroutine's original name may not be "AUTOLOAD", so we don't
367 * use that, but for lack of anything better we will use the sub's
368 * original package to look up $AUTOLOAD.
370 varstash = GvSTASH(CvGV(cv));
371 vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
373 gv_init(vargv, varstash, autoload, autolen, FALSE);
375 sv_setpv(varsv, HvNAME(stash));
376 sv_catpvn(varsv, "::", 2);
377 sv_catpvn(varsv, name, len);
378 SvTAINTED_off(varsv);
383 gv_stashpv(char *name, I32 create)
385 return gv_stashpvn(name, strlen(name), create);
389 gv_stashpvn(char *name, U32 namelen, I32 create)
396 if (namelen + 3 < sizeof smallbuf)
399 New(606, tmpbuf, namelen + 3, char);
400 Copy(name,tmpbuf,namelen,char);
401 tmpbuf[namelen++] = ':';
402 tmpbuf[namelen++] = ':';
403 tmpbuf[namelen] = '\0';
404 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
405 if (tmpbuf != smallbuf)
410 GvHV(tmpgv) = newHV();
413 HvNAME(stash) = savepv(name);
418 gv_stashsv(SV *sv, I32 create)
423 return gv_stashpvn(ptr, len, create);
428 gv_fetchpv(char *nambeg, I32 add, I32 sv_type)
431 register char *name = nambeg;
435 register char *namend;
439 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
442 for (namend = name; *namend; namend++) {
443 if ((*namend == '\'' && namend[1]) ||
444 (*namend == ':' && namend[1] == ':'))
448 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
456 if (len + 3 < sizeof smallbuf)
459 New(601, tmpbuf, len+3, char);
460 Copy(name, tmpbuf, len, char);
464 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
465 gv = gvp ? *gvp : Nullgv;
466 if (gv && gv != (GV*)&PL_sv_undef) {
467 if (SvTYPE(gv) != SVt_PVGV)
468 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
472 if (tmpbuf != smallbuf)
474 if (!gv || gv == (GV*)&PL_sv_undef)
477 if (!(stash = GvHV(gv)))
478 stash = GvHV(gv) = newHV();
481 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
489 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
496 /* No stash in name, so see how we can default */
499 if (isIDFIRST(*name)) {
502 if (isUPPER(*name)) {
503 if (*name == 'S' && (
504 strEQ(name, "SIG") ||
505 strEQ(name, "STDIN") ||
506 strEQ(name, "STDOUT") ||
507 strEQ(name, "STDERR")))
509 else if (*name == 'I' && strEQ(name, "INC"))
511 else if (*name == 'E' && strEQ(name, "ENV"))
513 else if (*name == 'A' && (
514 strEQ(name, "ARGV") ||
515 strEQ(name, "ARGVOUT")))
518 else if (*name == '_' && !name[1])
523 else if ((COP*)PL_curcop == &PL_compiling) {
525 if (add && (PL_hints & HINT_STRICT_VARS) &&
526 sv_type != SVt_PVCV &&
527 sv_type != SVt_PVGV &&
528 sv_type != SVt_PVFM &&
529 sv_type != SVt_PVIO &&
530 !(len == 1 && sv_type == SVt_PV && strchr("ab",*name)) )
532 gvp = (GV**)hv_fetch(stash,name,len,0);
534 *gvp == (GV*)&PL_sv_undef ||
535 SvTYPE(*gvp) != SVt_PVGV)
539 else if (sv_type == SVt_PV && !GvIMPORTED_SV(*gvp) ||
540 sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp) ||
541 sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp) )
543 warn("Variable \"%c%s\" is not imported",
544 sv_type == SVt_PVAV ? '@' :
545 sv_type == SVt_PVHV ? '%' : '$',
548 warn("(Did you mean &%s instead?)\n", name);
554 stash = PL_curcop->cop_stash;
560 /* By this point we should have a stash and a name */
565 if (add & ~GV_ADDMULTI) {
566 char sv_type_char = ((sv_type == SVt_PV) ? '$'
567 : (sv_type == SVt_PVAV) ? '@'
568 : (sv_type == SVt_PVHV) ? '%'
571 warn("Global symbol \"%c%s\" requires explicit package name",
574 warn("Global symbol \"%s\" requires explicit package name",
578 stash = PL_curstash ? PL_curstash : PL_defstash; /* avoid core dumps */
579 add_gvflags = ((sv_type == SVt_PV) ? GVf_IMPORTED_SV
580 : (sv_type == SVt_PVAV) ? GVf_IMPORTED_AV
581 : (sv_type == SVt_PVHV) ? GVf_IMPORTED_HV
585 if (!SvREFCNT(stash)) /* symbol table under destruction */
588 gvp = (GV**)hv_fetch(stash,name,len,add);
589 if (!gvp || *gvp == (GV*)&PL_sv_undef)
592 if (SvTYPE(gv) == SVt_PVGV) {
595 gv_init_sv(gv, sv_type);
598 } else if (add & GV_NOINIT) {
602 /* Adding a new symbol */
604 if (add & GV_ADDWARN)
605 warn("Had to create %s unexpectedly", nambeg);
606 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
607 gv_init_sv(gv, sv_type);
608 GvFLAGS(gv) |= add_gvflags;
610 /* set up magic where warranted */
613 if (strEQ(name, "ARGV")) {
614 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
624 if (strnEQ(name, "EXPORT", 6))
628 if (strEQ(name, "ISA")) {
631 sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
632 /* NOTE: No support for tied ISA */
633 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
634 && AvFILLp(av) == -1)
637 av_push(av, newSVpv(pname = "NDBM_File",0));
638 gv_stashpvn(pname, 9, TRUE);
639 av_push(av, newSVpv(pname = "DB_File",0));
640 gv_stashpvn(pname, 7, TRUE);
641 av_push(av, newSVpv(pname = "GDBM_File",0));
642 gv_stashpvn(pname, 9, TRUE);
643 av_push(av, newSVpv(pname = "SDBM_File",0));
644 gv_stashpvn(pname, 9, TRUE);
645 av_push(av, newSVpv(pname = "ODBM_File",0));
646 gv_stashpvn(pname, 9, TRUE);
652 if (strEQ(name, "OVERLOAD")) {
655 hv_magic(hv, gv, 'A');
658 #endif /* OVERLOAD */
660 if (strEQ(name, "SIG")) {
664 GvMULTI_on(PL_siggv);
665 hv = GvHVn(PL_siggv);
666 hv_magic(hv, PL_siggv, 'S');
667 for(i=1;sig_name[i];i++) {
669 init=hv_fetch(hv,sig_name[i],strlen(sig_name[i]),1);
671 sv_setsv(*init,&PL_sv_undef);
682 PL_sawampersand = TRUE;
689 PL_sawampersand = TRUE;
696 PL_sawampersand = TRUE;
702 sv_setpv(GvSV(gv),PL_chopset);
708 #ifdef COMPLEX_STATUS
709 sv_upgrade(GvSV(gv), SVt_PVLV);
716 if (sv_type > SVt_PV && PL_curcop != &PL_compiling) {
717 HV* stash = gv_stashpvn("Errno",5,FALSE);
718 if(!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
721 perl_require_pv("Errno.pm");
723 stash = gv_stashpvn("Errno",5,FALSE);
724 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
725 croak("Can't use %%! because Errno.pm is not available");
731 if (PL_dowarn && len == 1 && sv_type == SVt_PV)
732 warn("Use of $%s is deprecated", name);
754 case '\011': /* NOT \t in EBCDIC */
775 SvREADONLY_on(GvSV(gv));
777 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
783 sv_setpv(GvSV(gv),"\f");
784 PL_formfeed = GvSV(gv);
789 sv_setpv(GvSV(gv),"\034");
794 sv_upgrade(sv, SVt_PVNV);
795 sv_setpv(sv, PL_patchlevel);
805 gv_fullname3(SV *sv, GV *gv, char *prefix)
807 HV *hv = GvSTASH(gv);
812 sv_setpv(sv, prefix ? prefix : "");
813 sv_catpv(sv,HvNAME(hv));
814 sv_catpvn(sv,"::", 2);
815 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
819 gv_efullname3(SV *sv, GV *gv, char *prefix)
824 gv_fullname3(sv, egv, prefix);
827 /* XXX compatibility with versions <= 5.003. */
829 gv_fullname(SV *sv, GV *gv)
831 gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
834 /* XXX compatibility with versions <= 5.003. */
836 gv_efullname(SV *sv, GV *gv)
838 gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
848 io = (IO*)NEWSV(0,0);
849 sv_upgrade((SV *)io,SVt_PVIO);
852 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
854 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
855 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
871 for (i = 0; i <= (I32) HvMAX(stash); i++) {
872 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
873 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
874 (gv = (GV*)HeVAL(entry)) && (hv = GvHV(gv)) && HvNAME(hv))
876 if (hv != PL_defstash)
877 gv_check(hv); /* nested package */
879 else if (isALPHA(*HeKEY(entry))) {
880 gv = (GV*)HeVAL(entry);
881 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
883 PL_curcop->cop_line = GvLINE(gv);
884 filegv = GvFILEGV(gv);
885 PL_curcop->cop_filegv = filegv;
886 if (filegv && GvMULTI(filegv)) /* Filename began with slash */
888 warn("Name \"%s::%s\" used only once: possible typo",
889 HvNAME(stash), GvNAME(gv));
898 return gv_fetchpv(form("%s::_GEN_%ld", pack, (long)PL_gensym++),
902 /* hopefully this is only called on local symbol table entries */
910 /* multi-named GPs cannot be used for method cache */
911 SvREFCNT_dec(gp->gp_cv);
916 /* Adding a new name to a subroutine invalidates method cache */
929 if (!gv || !(gp = GvGP(gv)))
931 if (gp->gp_refcnt == 0) {
932 warn("Attempt to free unreferenced glob pointers");
936 /* Deleting the name of a subroutine invalidates method cache */
939 if (--gp->gp_refcnt > 0) {
940 if (gp->gp_egv == gv)
945 SvREFCNT_dec(gp->gp_sv);
946 SvREFCNT_dec(gp->gp_av);
947 SvREFCNT_dec(gp->gp_hv);
948 SvREFCNT_dec(gp->gp_io);
949 SvREFCNT_dec(gp->gp_cv);
950 SvREFCNT_dec(gp->gp_form);
956 #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
960 #ifdef MICROPORT /* Microport 2.4 hack */
965 return GvGP(gv)->gp_av;
967 return GvGP(gv_AVadd(gv))->gp_av;
974 return GvGP(gv)->gp_hv;
976 return GvGP(gv_HVadd(gv))->gp_hv;
978 #endif /* Microport 2.4 hack */
981 /* Updates and caches the CV's */
984 Gv_AMupdate(HV *stash)
991 MAGIC* mg=mg_find((SV*)stash,'c');
992 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
995 if (mg && amtp->was_ok_am == PL_amagic_generation
996 && amtp->was_ok_sub == PL_sub_generation)
997 return AMT_AMAGIC(amtp);
998 if (amtp && AMT_AMAGIC(amtp)) { /* Have table. */
1000 for (i=1; i<NofAMmeth; i++) {
1001 if (amtp->table[i]) {
1002 SvREFCNT_dec(amtp->table[i]);
1006 sv_unmagic((SV*)stash, 'c');
1008 DEBUG_o( deb("Recalcing overload magic in package %s\n",HvNAME(stash)) );
1010 amt.was_ok_am = PL_amagic_generation;
1011 amt.was_ok_sub = PL_sub_generation;
1012 amt.fallback = AMGfallNO;
1015 #ifdef OVERLOAD_VIA_HASH
1016 gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE); /* A shortcut */
1017 if (gvp && ((gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv)))) {
1024 /* Work with "fallback" key, which we assume to be first in AMG_names */
1026 if (( cp = (char *)AMG_names[0] ) &&
1027 (svp = (SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
1028 if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1029 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1031 for (i = 1; i < NofAMmeth; i++) {
1033 cp = (char *)AMG_names[i];
1035 svp = (SV**)hv_fetch(hv, cp, strlen(cp), FALSE);
1036 if (svp && ((sv = *svp) != &PL_sv_undef)) {
1037 switch (SvTYPE(sv)) {
1040 if (!SvOK(sv)) break;
1041 gv = gv_fetchmethod(stash, SvPV(sv, PL_na));
1042 if (gv) cv = GvCV(gv);
1046 if (SvTYPE(cv) == SVt_PVCV)
1051 croak("Not a subroutine reference in overload table");
1057 if (!(cv = GvCVu((GV*)sv)))
1058 cv = sv_2cv(sv, &stash, &gv, TRUE);
1063 croak("Method for operation %s not found in package %.256s during blessing\n",
1076 /* Work with "fallback" key, which we assume to be first in AMG_names */
1078 if ( cp = AMG_names[0] ) {
1079 /* Try to find via inheritance. */
1080 gv = gv_fetchmeth(stash, "()", 2, -1); /* A cookie: "()". */
1081 if (gv) sv = GvSV(gv);
1083 if (!gv) goto no_table;
1084 else if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1085 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1088 for (i = 1; i < NofAMmeth; i++) {
1089 SV *cookie = sv_2mortal(newSVpvf("(%s", cp = AMG_names[i]));
1090 DEBUG_o( deb("Checking overloading of `%s' in package `%.256s'\n",
1091 cp, HvNAME(stash)) );
1092 /* don't fill the cache while looking up! */
1093 gv = gv_fetchmeth(stash, SvPVX(cookie), SvCUR(cookie), -1);
1095 if(gv && (cv = GvCV(gv))) {
1096 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1097 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1098 /* GvSV contains the name of the method. */
1101 DEBUG_o( deb("Resolving method `%.256s' for overloaded `%s' in package `%.256s'\n",
1102 SvPV(GvSV(gv), PL_na), cp, HvNAME(stash)) );
1103 if (!SvPOK(GvSV(gv))
1104 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1107 /* Can be an import stub (created by `can'). */
1109 croak("Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'",
1110 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1113 croak("Cannot resolve method `%.256s' overloading `%s' in package `%.256s'",
1114 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1117 cv = GvCV(gv = ngv);
1119 DEBUG_o( deb("Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1120 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1121 GvNAME(CvGV(cv))) );
1125 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1128 AMT_AMAGIC_on(&amt);
1129 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMT));
1133 /* Here we have no table: */
1135 AMT_AMAGIC_off(&amt);
1136 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMTS));
1141 amagic_call(SV *left, SV *right, int method, int flags)
1146 CV **cvp=NULL, **ocvp=NULL;
1148 int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1149 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1151 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1152 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
1153 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1154 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1156 && ((cv = cvp[off=method+assignshift])
1157 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1159 (fl = 1, cv = cvp[off=method])))) {
1160 lr = -1; /* Call method for left argument */
1162 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1165 /* look for substituted methods */
1166 /* In all the covered cases we should be called with assign==0. */
1170 if ((cv = cvp[off=add_ass_amg])
1171 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1172 right = &PL_sv_yes; lr = -1; assign = 1;
1177 if ((cv = cvp[off = subtr_ass_amg])
1178 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1179 right = &PL_sv_yes; lr = -1; assign = 1;
1183 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1186 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1189 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1192 (void)((cv = cvp[off=bool__amg])
1193 || (cv = cvp[off=numer_amg])
1194 || (cv = cvp[off=string_amg]));
1200 * SV* ref causes confusion with the interpreter variable of
1203 SV* tmpRef=SvRV(left);
1204 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1206 * Just to be extra cautious. Maybe in some
1207 * additional cases sv_setsv is safe, too.
1209 SV* newref = newSVsv(tmpRef);
1210 SvOBJECT_on(newref);
1211 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
1217 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1218 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1219 SV* nullsv=sv_2mortal(newSViv(0));
1221 SV* lessp = amagic_call(left,nullsv,
1222 lt_amg,AMGf_noright);
1223 logic = SvTRUE(lessp);
1225 SV* lessp = amagic_call(left,nullsv,
1226 ncmp_amg,AMGf_noright);
1227 logic = (SvNV(lessp) < 0);
1230 if (off==subtr_amg) {
1241 if (cv = cvp[off=subtr_amg]) {
1243 left = sv_2mortal(newSViv(0));
1250 if (!cv) goto not_found;
1251 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1252 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
1253 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1254 ? (amtp = (AMT*)mg->mg_ptr)->table
1256 && (cv = cvp[off=method])) { /* Method for right
1259 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1260 && (cvp=ocvp) && (lr = -1))
1261 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1262 && !(flags & AMGf_unary)) {
1263 /* We look for substitution for
1264 * comparison operations and
1266 if (method==concat_amg || method==concat_ass_amg
1267 || method==repeat_amg || method==repeat_ass_amg) {
1268 return NULL; /* Delegate operation to string conversion */
1278 postpr = 1; off=ncmp_amg; break;
1285 postpr = 1; off=scmp_amg; break;
1287 if (off != -1) cv = cvp[off];
1292 not_found: /* No method found, either report or croak */
1293 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1294 notfound = 1; lr = -1;
1295 } else if (cvp && (cv=cvp[nomethod_amg])) {
1296 notfound = 1; lr = 1;
1299 if (off==-1) off=method;
1300 msg = sv_2mortal(newSVpvf(
1301 "Operation `%s': no method found,%sargument %s%s%s%s",
1302 AMG_names[method + assignshift],
1303 (flags & AMGf_unary ? " " : "\n\tleft "),
1305 "in overloaded package ":
1306 "has no overloaded magic",
1308 HvNAME(SvSTASH(SvRV(left))):
1311 ",\n\tright argument in overloaded package ":
1314 : ",\n\tright argument has no overloaded magic"),
1316 HvNAME(SvSTASH(SvRV(right))):
1318 if (amtp && amtp->fallback >= AMGfallYES) {
1319 DEBUG_o( deb("%s", SvPVX(msg)) );
1325 force_cpy = force_cpy || assign;
1330 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1332 method+assignshift==off? "" :
1334 method+assignshift==off? "" :
1335 AMG_names[method+assignshift],
1336 method+assignshift==off? "" : "')",
1337 flags & AMGf_unary? "" :
1338 lr==1 ? " for right argument": " for left argument",
1339 flags & AMGf_unary? " for argument" : "",
1341 fl? ",\n\tassignment variant used": "") );
1343 /* Since we use shallow copy during assignment, we need
1344 * to dublicate the contents, probably calling user-supplied
1345 * version of copy operator
1347 /* We need to copy in following cases:
1348 * a) Assignment form was called.
1349 * assignshift==1, assign==T, method + 1 == off
1350 * b) Increment or decrement, called directly.
1351 * assignshift==0, assign==0, method + 0 == off
1352 * c) Increment or decrement, translated to assignment add/subtr.
1353 * assignshift==0, assign==T,
1355 * d) Increment or decrement, translated to nomethod.
1356 * assignshift==0, assign==0,
1358 * e) Assignment form translated to nomethod.
1359 * assignshift==1, assign==T, method + 1 != off
1362 /* off is method, method+assignshift, or a result of opcode substitution.
1363 * In the latter case assignshift==0, so only notfound case is important.
1365 if (( (method + assignshift == off)
1366 && (assign || (method == inc_amg) || (method == dec_amg)))
1373 bool oldcatch = CATCH_GET;
1376 Zero(&myop, 1, BINOP);
1377 myop.op_last = (OP *) &myop;
1378 myop.op_next = Nullop;
1379 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1381 PUSHSTACKi(PERLSI_OVERLOAD);
1384 PL_op = (OP *) &myop;
1385 if (PERLDB_SUB && PL_curstash != PL_debstash)
1386 PL_op->op_private |= OPpENTERSUB_DB;
1390 EXTEND(SP, notfound + 5);
1391 PUSHs(lr>0? right: left);
1392 PUSHs(lr>0? left: right);
1393 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1395 PUSHs( sv_2mortal(newSVpv((char *)AMG_names[method + assignshift],0)) );
1400 if (PL_op = pp_entersub(ARGS))
1407 CATCH_SET(oldcatch);
1414 ans=SvIV(res)<=0; break;
1417 ans=SvIV(res)<0; break;
1420 ans=SvIV(res)>=0; break;
1423 ans=SvIV(res)>0; break;
1426 ans=SvIV(res)==0; break;
1429 ans=SvIV(res)!=0; break;
1432 SvSetSV(left,res); return left;
1434 ans=!SvOK(res); break;
1437 } else if (method==copy_amg) {
1439 croak("Copy method did not return a reference");
1441 return SvREFCNT_inc(SvRV(res));
1447 #endif /* OVERLOAD */