3 * Copyright (c) 1991-1999, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
11 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
12 * of your inquisitiveness, I shall spend all the rest of my days answering
13 * you. What more do you want to know?'
14 * 'The names of all the stars, and of all living things, and the whole
15 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
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);
110 if (multi || doproto) /* doproto means it _was_ mentioned */
112 if (doproto) { /* Replicate part of newSUB here. */
115 /* XXX unsafe for threads if eval_owner isn't held */
116 start_subparse(0,0); /* Create CV in compcv. */
117 GvCV(gv) = PL_compcv;
121 CvGV(GvCV(gv)) = (GV*)SvREFCNT_inc(gv);
122 CvFILEGV(GvCV(gv)) = PL_curcop->cop_filegv;
123 CvSTASH(GvCV(gv)) = PL_curstash;
125 CvOWNER(GvCV(gv)) = 0;
126 if (!CvMUTEXP(GvCV(gv))) {
127 New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex);
128 MUTEX_INIT(CvMUTEXP(GvCV(gv)));
130 #endif /* USE_THREADS */
132 sv_setpv((SV*)GvCV(gv), proto);
139 gv_init_sv(GV *gv, I32 sv_type)
155 gv_fetchmeth(HV *stash, char *name, STRLEN len, I32 level)
165 if ((level > 100) || (level < -100))
166 croak("Recursive inheritance detected while looking for method '%s' in package '%s'",
167 name, HvNAME(stash));
169 DEBUG_o( deb("Looking for method %s in package %s\n",name,HvNAME(stash)) );
171 gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
176 if (SvTYPE(topgv) != SVt_PVGV)
177 gv_init(topgv, stash, name, len, TRUE);
178 if (cv = GvCV(topgv)) {
179 /* If genuine method or valid cache entry, use it */
180 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
182 /* Stale cached entry: junk it */
184 GvCV(topgv) = cv = Nullcv;
187 else if (GvCVGEN(topgv) == PL_sub_generation)
188 return 0; /* cache indicates sub doesn't exist */
191 gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
192 av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
194 /* create and re-create @.*::SUPER::ISA on demand */
195 if (!av || !SvMAGIC(av)) {
196 char* packname = HvNAME(stash);
197 STRLEN packlen = strlen(packname);
199 if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
203 basestash = gv_stashpvn(packname, packlen, TRUE);
204 gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
205 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
206 dTHR; /* just for SvREFCNT_dec */
207 gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
208 if (!gvp || !(gv = *gvp))
209 croak("Cannot create %s::ISA", HvNAME(stash));
210 if (SvTYPE(gv) != SVt_PVGV)
211 gv_init(gv, stash, "ISA", 3, TRUE);
212 SvREFCNT_dec(GvAV(gv));
213 GvAV(gv) = (AV*)SvREFCNT_inc(av);
219 SV** svp = AvARRAY(av);
220 /* NOTE: No support for tied ISA */
221 I32 items = AvFILLp(av) + 1;
224 HV* basestash = gv_stashsv(sv, FALSE);
227 warn("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)
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 (PL_dowarn && !method && (GvCVGEN(gv) || GvSTASH(gv) != stash))
363 "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
364 HvNAME(stash), (int)len, name);
367 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
368 * The subroutine's original name may not be "AUTOLOAD", so we don't
369 * use that, but for lack of anything better we will use the sub's
370 * original package to look up $AUTOLOAD.
372 varstash = GvSTASH(CvGV(cv));
373 vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
375 gv_init(vargv, varstash, autoload, autolen, FALSE);
377 sv_setpv(varsv, HvNAME(stash));
378 sv_catpvn(varsv, "::", 2);
379 sv_catpvn(varsv, name, len);
380 SvTAINTED_off(varsv);
385 gv_stashpv(char *name, I32 create)
387 return gv_stashpvn(name, strlen(name), create);
391 gv_stashpvn(char *name, U32 namelen, I32 create)
398 if (namelen + 3 < sizeof smallbuf)
401 New(606, tmpbuf, namelen + 3, char);
402 Copy(name,tmpbuf,namelen,char);
403 tmpbuf[namelen++] = ':';
404 tmpbuf[namelen++] = ':';
405 tmpbuf[namelen] = '\0';
406 tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
407 if (tmpbuf != smallbuf)
412 GvHV(tmpgv) = newHV();
415 HvNAME(stash) = savepv(name);
420 gv_stashsv(SV *sv, I32 create)
425 return gv_stashpvn(ptr, len, create);
430 gv_fetchpv(char *nambeg, I32 add, I32 sv_type)
433 register char *name = nambeg;
437 register char *namend;
441 if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
444 for (namend = name; *namend; namend++) {
445 if ((*namend == '\'' && namend[1]) ||
446 (*namend == ':' && namend[1] == ':'))
450 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
458 if (len + 3 < sizeof smallbuf)
461 New(601, tmpbuf, len+3, char);
462 Copy(name, tmpbuf, len, char);
466 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
467 gv = gvp ? *gvp : Nullgv;
468 if (gv && gv != (GV*)&PL_sv_undef) {
469 if (SvTYPE(gv) != SVt_PVGV)
470 gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
474 if (tmpbuf != smallbuf)
476 if (!gv || gv == (GV*)&PL_sv_undef)
479 if (!(stash = GvHV(gv)))
480 stash = GvHV(gv) = newHV();
483 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
491 return gv ? gv : (GV*)*hv_fetch(PL_defstash, "main::", 6, TRUE);
498 /* No stash in name, so see how we can default */
501 if (isIDFIRST(*name)) {
504 if (isUPPER(*name)) {
505 if (*name == 'S' && (
506 strEQ(name, "SIG") ||
507 strEQ(name, "STDIN") ||
508 strEQ(name, "STDOUT") ||
509 strEQ(name, "STDERR")))
511 else if (*name == 'I' && strEQ(name, "INC"))
513 else if (*name == 'E' && strEQ(name, "ENV"))
515 else if (*name == 'A' && (
516 strEQ(name, "ARGV") ||
517 strEQ(name, "ARGVOUT")))
520 else if (*name == '_' && !name[1])
525 else if ((COP*)PL_curcop == &PL_compiling) {
527 if (add && (PL_hints & HINT_STRICT_VARS) &&
528 sv_type != SVt_PVCV &&
529 sv_type != SVt_PVGV &&
530 sv_type != SVt_PVFM &&
531 sv_type != SVt_PVIO &&
532 !(len == 1 && sv_type == SVt_PV && strchr("ab",*name)) )
534 gvp = (GV**)hv_fetch(stash,name,len,0);
536 *gvp == (GV*)&PL_sv_undef ||
537 SvTYPE(*gvp) != SVt_PVGV)
541 else if (sv_type == SVt_PV && !GvIMPORTED_SV(*gvp) ||
542 sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp) ||
543 sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp) )
545 warn("Variable \"%c%s\" is not imported",
546 sv_type == SVt_PVAV ? '@' :
547 sv_type == SVt_PVHV ? '%' : '$',
550 warn("(Did you mean &%s instead?)\n", name);
556 stash = PL_curcop->cop_stash;
562 /* By this point we should have a stash and a name */
567 if (add & ~GV_ADDMULTI) {
568 char sv_type_char = ((sv_type == SVt_PV) ? '$'
569 : (sv_type == SVt_PVAV) ? '@'
570 : (sv_type == SVt_PVHV) ? '%'
573 warn("Global symbol \"%c%s\" requires explicit package name",
576 warn("Global symbol \"%s\" requires explicit package name",
580 stash = PL_curstash ? PL_curstash : PL_defstash; /* avoid core dumps */
581 add_gvflags = ((sv_type == SVt_PV) ? GVf_IMPORTED_SV
582 : (sv_type == SVt_PVAV) ? GVf_IMPORTED_AV
583 : (sv_type == SVt_PVHV) ? GVf_IMPORTED_HV
587 if (!SvREFCNT(stash)) /* symbol table under destruction */
590 gvp = (GV**)hv_fetch(stash,name,len,add);
591 if (!gvp || *gvp == (GV*)&PL_sv_undef)
594 if (SvTYPE(gv) == SVt_PVGV) {
597 gv_init_sv(gv, sv_type);
600 } else if (add & GV_NOINIT) {
604 /* Adding a new symbol */
606 if (add & GV_ADDWARN)
607 warn("Had to create %s unexpectedly", nambeg);
608 gv_init(gv, stash, name, len, add & GV_ADDMULTI);
609 gv_init_sv(gv, sv_type);
610 GvFLAGS(gv) |= add_gvflags;
612 /* set up magic where warranted */
615 if (strEQ(name, "ARGV")) {
616 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
620 if (strnEQ(name, "EXPORT", 6))
624 if (strEQ(name, "ISA")) {
627 sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
628 /* NOTE: No support for tied ISA */
629 if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
630 && AvFILLp(av) == -1)
633 av_push(av, newSVpv(pname = "NDBM_File",0));
634 gv_stashpvn(pname, 9, TRUE);
635 av_push(av, newSVpv(pname = "DB_File",0));
636 gv_stashpvn(pname, 7, TRUE);
637 av_push(av, newSVpv(pname = "GDBM_File",0));
638 gv_stashpvn(pname, 9, TRUE);
639 av_push(av, newSVpv(pname = "SDBM_File",0));
640 gv_stashpvn(pname, 9, TRUE);
641 av_push(av, newSVpv(pname = "ODBM_File",0));
642 gv_stashpvn(pname, 9, TRUE);
648 if (strEQ(name, "OVERLOAD")) {
651 hv_magic(hv, gv, 'A');
654 #endif /* OVERLOAD */
656 if (strEQ(name, "SIG")) {
660 GvMULTI_on(PL_siggv);
661 hv = GvHVn(PL_siggv);
662 hv_magic(hv, PL_siggv, 'S');
663 for(i=1;sig_name[i];i++) {
665 init=hv_fetch(hv,sig_name[i],strlen(sig_name[i]),1);
667 sv_setsv(*init,&PL_sv_undef);
678 PL_sawampersand = TRUE;
685 PL_sawampersand = TRUE;
692 PL_sawampersand = TRUE;
698 sv_setpv(GvSV(gv),PL_chopset);
704 #ifdef COMPLEX_STATUS
705 sv_upgrade(GvSV(gv), SVt_PVLV);
712 if (sv_type > SVt_PV && PL_curcop != &PL_compiling) {
713 HV* stash = gv_stashpvn("Errno",5,FALSE);
714 if(!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
717 perl_require_pv("Errno.pm");
719 stash = gv_stashpvn("Errno",5,FALSE);
720 if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
721 croak("Can't use %%! because Errno.pm is not available");
727 if (PL_dowarn && len == 1 && sv_type == SVt_PV)
728 warn("Use of $%s is deprecated", name);
751 case '\011': /* NOT \t in EBCDIC */
772 SvREADONLY_on(GvSV(gv));
774 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
780 sv_setpv(GvSV(gv),"\f");
781 PL_formfeed = GvSV(gv);
786 sv_setpv(GvSV(gv),"\034");
791 sv_upgrade(sv, SVt_PVNV);
792 sv_setpv(sv, PL_patchlevel);
802 gv_fullname3(SV *sv, GV *gv, char *prefix)
804 HV *hv = GvSTASH(gv);
809 sv_setpv(sv, prefix ? prefix : "");
810 sv_catpv(sv,HvNAME(hv));
811 sv_catpvn(sv,"::", 2);
812 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
816 gv_efullname3(SV *sv, GV *gv, char *prefix)
821 gv_fullname3(sv, egv, prefix);
824 /* XXX compatibility with versions <= 5.003. */
826 gv_fullname(SV *sv, GV *gv)
828 gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
831 /* XXX compatibility with versions <= 5.003. */
833 gv_efullname(SV *sv, GV *gv)
835 gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
845 io = (IO*)NEWSV(0,0);
846 sv_upgrade((SV *)io,SVt_PVIO);
849 iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
850 /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
851 if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
852 iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
853 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
869 for (i = 0; i <= (I32) HvMAX(stash); i++) {
870 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
871 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
872 (gv = (GV*)HeVAL(entry)) && (hv = GvHV(gv)) && HvNAME(hv))
874 if (hv != PL_defstash)
875 gv_check(hv); /* nested package */
877 else if (isALPHA(*HeKEY(entry))) {
878 gv = (GV*)HeVAL(entry);
879 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
881 PL_curcop->cop_line = GvLINE(gv);
882 filegv = GvFILEGV(gv);
883 PL_curcop->cop_filegv = filegv;
884 if (filegv && GvMULTI(filegv)) /* Filename began with slash */
886 warn("Name \"%s::%s\" used only once: possible typo",
887 HvNAME(stash), GvNAME(gv));
896 return gv_fetchpv(form("%s::_GEN_%ld", pack, (long)PL_gensym++),
900 /* hopefully this is only called on local symbol table entries */
908 /* multi-named GPs cannot be used for method cache */
909 SvREFCNT_dec(gp->gp_cv);
914 /* Adding a new name to a subroutine invalidates method cache */
927 if (!gv || !(gp = GvGP(gv)))
929 if (gp->gp_refcnt == 0) {
930 warn("Attempt to free unreferenced glob pointers");
934 /* Deleting the name of a subroutine invalidates method cache */
937 if (--gp->gp_refcnt > 0) {
938 if (gp->gp_egv == gv)
943 SvREFCNT_dec(gp->gp_sv);
944 SvREFCNT_dec(gp->gp_av);
945 SvREFCNT_dec(gp->gp_hv);
946 SvREFCNT_dec(gp->gp_io);
947 SvREFCNT_dec(gp->gp_cv);
948 SvREFCNT_dec(gp->gp_form);
954 #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
958 #ifdef MICROPORT /* Microport 2.4 hack */
963 return GvGP(gv)->gp_av;
965 return GvGP(gv_AVadd(gv))->gp_av;
972 return GvGP(gv)->gp_hv;
974 return GvGP(gv_HVadd(gv))->gp_hv;
976 #endif /* Microport 2.4 hack */
979 /* Updates and caches the CV's */
982 Gv_AMupdate(HV *stash)
989 MAGIC* mg=mg_find((SV*)stash,'c');
990 AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
994 if (mg && amtp->was_ok_am == PL_amagic_generation
995 && amtp->was_ok_sub == PL_sub_generation)
996 return AMT_AMAGIC(amtp);
997 if (amtp && AMT_AMAGIC(amtp)) { /* Have table. */
999 for (i=1; i<NofAMmeth; i++) {
1000 if (amtp->table[i]) {
1001 SvREFCNT_dec(amtp->table[i]);
1005 sv_unmagic((SV*)stash, 'c');
1007 DEBUG_o( deb("Recalcing overload magic in package %s\n",HvNAME(stash)) );
1009 amt.was_ok_am = PL_amagic_generation;
1010 amt.was_ok_sub = PL_sub_generation;
1011 amt.fallback = AMGfallNO;
1014 #ifdef OVERLOAD_VIA_HASH
1015 gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE); /* A shortcut */
1016 if (gvp && ((gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv)))) {
1023 /* Work with "fallback" key, which we assume to be first in AMG_names */
1025 if (( cp = (char *)AMG_names[0] ) &&
1026 (svp = (SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
1027 if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1028 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1030 for (i = 1; i < NofAMmeth; i++) {
1032 cp = (char *)AMG_names[i];
1034 svp = (SV**)hv_fetch(hv, cp, strlen(cp), FALSE);
1035 if (svp && ((sv = *svp) != &PL_sv_undef)) {
1036 switch (SvTYPE(sv)) {
1039 if (!SvOK(sv)) break;
1040 gv = gv_fetchmethod(stash, SvPV(sv, n_a));
1041 if (gv) cv = GvCV(gv);
1045 if (SvTYPE(cv) == SVt_PVCV)
1050 croak("Not a subroutine reference in overload table");
1056 if (!(cv = GvCVu((GV*)sv)))
1057 cv = sv_2cv(sv, &stash, &gv, TRUE);
1062 croak("Method for operation %s not found in package %.256s during blessing\n",
1075 /* Work with "fallback" key, which we assume to be first in AMG_names */
1077 if ( cp = AMG_names[0] ) {
1078 /* Try to find via inheritance. */
1079 gv = gv_fetchmeth(stash, "()", 2, -1); /* A cookie: "()". */
1080 if (gv) sv = GvSV(gv);
1082 if (!gv) goto no_table;
1083 else if (SvTRUE(sv)) amt.fallback=AMGfallYES;
1084 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
1087 for (i = 1; i < NofAMmeth; i++) {
1088 SV *cookie = sv_2mortal(newSVpvf("(%s", cp = AMG_names[i]));
1089 DEBUG_o( deb("Checking overloading of `%s' in package `%.256s'\n",
1090 cp, HvNAME(stash)) );
1091 /* don't fill the cache while looking up! */
1092 gv = gv_fetchmeth(stash, SvPVX(cookie), SvCUR(cookie), -1);
1094 if(gv && (cv = GvCV(gv))) {
1095 if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
1096 && strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
1097 /* GvSV contains the name of the method. */
1100 DEBUG_o( deb("Resolving method `%.256s' for overloaded `%s' in package `%.256s'\n",
1101 SvPV(GvSV(gv), n_a), cp, HvNAME(stash)) );
1102 if (!SvPOK(GvSV(gv))
1103 || !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
1106 /* Can be an import stub (created by `can'). */
1108 croak("Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'",
1109 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1112 croak("Cannot resolve method `%.256s' overloading `%s' in package `%.256s'",
1113 (SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
1116 cv = GvCV(gv = ngv);
1118 DEBUG_o( deb("Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
1119 cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
1120 GvNAME(CvGV(cv))) );
1124 amt.table[i]=(CV*)SvREFCNT_inc(cv);
1127 AMT_AMAGIC_on(&amt);
1128 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMT));
1132 /* Here we have no table: */
1134 AMT_AMAGIC_off(&amt);
1135 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMTS));
1140 amagic_call(SV *left, SV *right, int method, int flags)
1145 CV **cvp=NULL, **ocvp=NULL;
1147 int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
1148 int postpr = 0, force_cpy = 0, assignshift = assign ? 1 : 0;
1150 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
1151 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
1152 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1153 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
1155 && ((cv = cvp[off=method+assignshift])
1156 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
1158 (fl = 1, cv = cvp[off=method])))) {
1159 lr = -1; /* Call method for left argument */
1161 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
1164 /* look for substituted methods */
1165 /* In all the covered cases we should be called with assign==0. */
1169 if ((cv = cvp[off=add_ass_amg])
1170 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
1171 right = &PL_sv_yes; lr = -1; assign = 1;
1176 if ((cv = cvp[off = subtr_ass_amg])
1177 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
1178 right = &PL_sv_yes; lr = -1; assign = 1;
1182 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
1185 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
1188 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
1191 (void)((cv = cvp[off=bool__amg])
1192 || (cv = cvp[off=numer_amg])
1193 || (cv = cvp[off=string_amg]));
1199 * SV* ref causes confusion with the interpreter variable of
1202 SV* tmpRef=SvRV(left);
1203 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
1205 * Just to be extra cautious. Maybe in some
1206 * additional cases sv_setsv is safe, too.
1208 SV* newref = newSVsv(tmpRef);
1209 SvOBJECT_on(newref);
1210 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
1216 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
1217 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
1218 SV* nullsv=sv_2mortal(newSViv(0));
1220 SV* lessp = amagic_call(left,nullsv,
1221 lt_amg,AMGf_noright);
1222 logic = SvTRUE(lessp);
1224 SV* lessp = amagic_call(left,nullsv,
1225 ncmp_amg,AMGf_noright);
1226 logic = (SvNV(lessp) < 0);
1229 if (off==subtr_amg) {
1240 if (cv = cvp[off=subtr_amg]) {
1242 left = sv_2mortal(newSViv(0));
1249 if (!cv) goto not_found;
1250 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
1251 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
1252 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
1253 ? (amtp = (AMT*)mg->mg_ptr)->table
1255 && (cv = cvp[off=method])) { /* Method for right
1258 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
1259 && (cvp=ocvp) && (lr = -1))
1260 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
1261 && !(flags & AMGf_unary)) {
1262 /* We look for substitution for
1263 * comparison operations and
1265 if (method==concat_amg || method==concat_ass_amg
1266 || method==repeat_amg || method==repeat_ass_amg) {
1267 return NULL; /* Delegate operation to string conversion */
1277 postpr = 1; off=ncmp_amg; break;
1284 postpr = 1; off=scmp_amg; break;
1286 if (off != -1) cv = cvp[off];
1291 not_found: /* No method found, either report or croak */
1292 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1293 notfound = 1; lr = -1;
1294 } else if (cvp && (cv=cvp[nomethod_amg])) {
1295 notfound = 1; lr = 1;
1298 if (off==-1) off=method;
1299 msg = sv_2mortal(newSVpvf(
1300 "Operation `%s': no method found,%sargument %s%s%s%s",
1301 AMG_names[method + assignshift],
1302 (flags & AMGf_unary ? " " : "\n\tleft "),
1304 "in overloaded package ":
1305 "has no overloaded magic",
1307 HvNAME(SvSTASH(SvRV(left))):
1310 ",\n\tright argument in overloaded package ":
1313 : ",\n\tright argument has no overloaded magic"),
1315 HvNAME(SvSTASH(SvRV(right))):
1317 if (amtp && amtp->fallback >= AMGfallYES) {
1318 DEBUG_o( deb("%s", SvPVX(msg)) );
1324 force_cpy = force_cpy || assign;
1329 "Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
1331 method+assignshift==off? "" :
1333 method+assignshift==off? "" :
1334 AMG_names[method+assignshift],
1335 method+assignshift==off? "" : "')",
1336 flags & AMGf_unary? "" :
1337 lr==1 ? " for right argument": " for left argument",
1338 flags & AMGf_unary? " for argument" : "",
1340 fl? ",\n\tassignment variant used": "") );
1342 /* Since we use shallow copy during assignment, we need
1343 * to dublicate the contents, probably calling user-supplied
1344 * version of copy operator
1346 /* We need to copy in following cases:
1347 * a) Assignment form was called.
1348 * assignshift==1, assign==T, method + 1 == off
1349 * b) Increment or decrement, called directly.
1350 * assignshift==0, assign==0, method + 0 == off
1351 * c) Increment or decrement, translated to assignment add/subtr.
1352 * assignshift==0, assign==T,
1354 * d) Increment or decrement, translated to nomethod.
1355 * assignshift==0, assign==0,
1357 * e) Assignment form translated to nomethod.
1358 * assignshift==1, assign==T, method + 1 != off
1361 /* off is method, method+assignshift, or a result of opcode substitution.
1362 * In the latter case assignshift==0, so only notfound case is important.
1364 if (( (method + assignshift == off)
1365 && (assign || (method == inc_amg) || (method == dec_amg)))
1372 bool oldcatch = CATCH_GET;
1375 Zero(&myop, 1, BINOP);
1376 myop.op_last = (OP *) &myop;
1377 myop.op_next = Nullop;
1378 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
1380 PUSHSTACKi(PERLSI_OVERLOAD);
1383 PL_op = (OP *) &myop;
1384 if (PERLDB_SUB && PL_curstash != PL_debstash)
1385 PL_op->op_private |= OPpENTERSUB_DB;
1389 EXTEND(SP, notfound + 5);
1390 PUSHs(lr>0? right: left);
1391 PUSHs(lr>0? left: right);
1392 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
1394 PUSHs( sv_2mortal(newSVpv((char *)AMG_names[method + assignshift],0)) );
1399 if (PL_op = pp_entersub(ARGS))
1406 CATCH_SET(oldcatch);
1413 ans=SvIV(res)<=0; break;
1416 ans=SvIV(res)<0; break;
1419 ans=SvIV(res)>=0; break;
1422 ans=SvIV(res)>0; break;
1425 ans=SvIV(res)==0; break;
1428 ans=SvIV(res)!=0; break;
1431 SvSetSV(left,res); return left;
1433 ans=!SvOK(res); break;
1436 } else if (method==copy_amg) {
1438 croak("Copy method did not return a reference");
1440 return SvREFCNT_inc(SvRV(res));
1446 #endif /* OVERLOAD */