3 * Copyright (c) 1991-1994, 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,'
28 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
29 croak("Bad symbol for array");
39 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
40 croak("Bad symbol for hash");
50 if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
51 croak("Bad symbol for filehandle");
64 sprintf(tmpbuf,"::_<%s", name);
65 gv = gv_fetchpv(tmpbuf, TRUE, SVt_PVGV);
66 sv_setpv(GvSV(gv), name);
67 if (*name == '/' && (instr(name,"/lib/") || instr(name,".pm")))
70 hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
75 gv_init(gv, stash, name, len, multi)
84 sv_upgrade(gv, SVt_PVGV);
88 GvGP(gv) = gp_ref(gp);
90 GvSV(gv) = NEWSV(72,0);
91 GvLINE(gv) = curcop->cop_line;
92 GvFILEGV(gv) = curcop->cop_filegv;
94 sv_magic((SV*)gv, (SV*)gv, '*', name, len);
96 GvNAME(gv) = savepvn(name, len);
103 gv_init_sv(gv, sv_type)
121 gv_fetchmeth(stash, name, len, level)
137 croak("Recursive inheritance detected");
139 gvp = (GV**)hv_fetch(stash, name, len, TRUE);
141 DEBUG_o( deb("Looking for method %s in package %s\n",name,HvNAME(stash)) );
143 if (SvTYPE(topgv) != SVt_PVGV)
144 gv_init(topgv, stash, name, len, TRUE);
146 if (cv=GvCV(topgv)) {
147 if (GvCVGEN(topgv) >= sub_generation)
148 return topgv; /* valid cached inheritance */
149 if (!GvCVGEN(topgv)) { /* not an inheritance cache */
153 /* stale cached entry, just junk it */
154 GvCV(topgv) = cv = 0;
158 /* if cv is still set, we have to free it if we find something to cache */
160 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
161 if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
162 SV** svp = AvARRAY(av);
163 I32 items = AvFILL(av) + 1;
166 HV* basestash = gv_stashsv(sv, FALSE);
169 warn("Can't locate package %s for @%s::ISA",
170 SvPVX(sv), HvNAME(stash));
173 gv = gv_fetchmeth(basestash, name, len, level + 1);
175 if (cv) { /* junk old undef */
176 assert(SvREFCNT(topgv) > 1);
180 GvCV(topgv) = GvCV(gv); /* cache the CV */
181 GvCVGEN(topgv) = sub_generation; /* valid for now */
188 if (lastchance = gv_stashpv("UNIVERSAL", FALSE)) {
189 if (gv = gv_fetchmeth(lastchance, name, len, level + 1)) {
190 if (cv) { /* junk old undef */
191 assert(SvREFCNT(topgv) > 1);
195 GvCV(topgv) = GvCV(gv); /* cache the CV */
196 GvCVGEN(topgv) = sub_generation; /* valid for now */
206 gv_fetchmethod(stash, name)
214 for (nend = name; *nend; nend++) {
215 if (*nend == ':' || *nend == '\'')
220 char *origname = name;
226 stash = gv_stashpv(origname,TRUE);
229 gv = gv_fetchmeth(stash, name, nend - name, 0);
233 if (strEQ(name,"import") || strEQ(name,"unimport"))
235 else if (strNE(name, "AUTOLOAD")) {
236 gv = gv_fetchmeth(stash, "AUTOLOAD", 8, 0);
237 if (gv && (cv = GvCV(gv))) { /* One more chance... */
238 SV *tmpstr = sv_2mortal(newSVpv(HvNAME(stash),0));
239 sv_catpvn(tmpstr,"::", 2);
240 sv_catpvn(tmpstr, name, nend - name);
241 sv_setsv(GvSV(CvGV(cv)), tmpstr);
249 gv_stashpv(name,create)
256 sprintf(tmpbuf,"%.*s::",1200,name);
257 tmpgv = gv_fetchpv(tmpbuf,create, SVt_PVHV);
261 GvHV(tmpgv) = newHV();
264 HvNAME(stash) = savepv(name);
269 gv_stashsv(sv,create)
273 return gv_stashpv(SvPV(sv,na), create);
278 gv_fetchpv(nambeg,add,sv_type)
283 register char *name = nambeg;
287 register char *namend;
292 for (namend = name; *namend; namend++) {
293 if ((*namend == '\'' && namend[1]) ||
294 (*namend == ':' && namend[1] == ':'))
298 if (!SvREFCNT(stash)) /* symbol table under destruction */
303 New(601, tmpbuf, len+3, char);
304 Copy(name, tmpbuf, len, char);
308 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
310 if (!gvp || *gvp == (GV*)&sv_undef)
314 if (SvTYPE(gv) == SVt_PVGV)
319 gv_init(gv, stash, nambeg, namend - nambeg, (add & 2));
321 if (!(stash = GvHV(gv)))
322 stash = GvHV(gv) = newHV();
325 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
333 return gv ? gv : *hv_fetch(defstash, "main::", 6, TRUE);
340 /* No stash in name, so see how we can default */
343 if (isIDFIRST(*name)) {
344 if (isUPPER(*name)) {
346 if (*name == 'S' && (
347 strEQ(name, "SIG") ||
348 strEQ(name, "STDIN") ||
349 strEQ(name, "STDOUT") ||
350 strEQ(name, "STDERR") ))
353 else if (*name > 'E') {
354 if (*name == 'I' && strEQ(name, "INC"))
357 else if (*name > 'A') {
358 if (*name == 'E' && strEQ(name, "ENV"))
361 else if (*name == 'A' && (
362 strEQ(name, "ARGV") ||
363 strEQ(name, "ARGVOUT") ))
366 else if (*name == '_' && !name[1])
370 else if ((COP*)curcop == &compiling) {
372 if (add && (hints & HINT_STRICT_VARS) &&
373 sv_type != SVt_PVCV &&
374 sv_type != SVt_PVGV &&
381 stash = curcop->cop_stash;
387 /* By this point we should have a stash and a name */
391 warn("Global symbol \"%s\" requires explicit package name", name);
393 stash = curstash ? curstash : defstash; /* avoid core dumps */
399 if (!SvREFCNT(stash)) /* symbol table under destruction */
402 gvp = (GV**)hv_fetch(stash,name,len,add);
403 if (!gvp || *gvp == (GV*)&sv_undef)
406 if (SvTYPE(gv) == SVt_PVGV) {
409 gv_init_sv(gv, sv_type);
414 /* Adding a new symbol */
417 warn("Had to create %s unexpectedly", nambeg);
418 gv_init(gv, stash, name, len, add & 2);
419 gv_init_sv(gv, sv_type);
421 /* set up magic where warranted */
424 if (strEQ(name, "ARGV")) {
425 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
435 if (strnEQ(name, "EXPORT", 6))
439 if (strEQ(name, "ISA")) {
442 sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
443 if (add & 2 && strEQ(nambeg,"AnyDBM_File::ISA") && AvFILL(av) == -1)
446 av_push(av, newSVpv(pname = "NDBM_File",0));
447 gv_stashpv(pname, TRUE);
448 av_push(av, newSVpv(pname = "DB_File",0));
449 gv_stashpv(pname, TRUE);
450 av_push(av, newSVpv(pname = "GDBM_File",0));
451 gv_stashpv(pname, TRUE);
452 av_push(av, newSVpv(pname = "SDBM_File",0));
453 gv_stashpv(pname, TRUE);
454 av_push(av, newSVpv(pname = "ODBM_File",0));
455 gv_stashpv(pname, TRUE);
461 if (strEQ(name, "OVERLOAD")) {
464 sv_magic((SV*)hv, (SV*)gv, 'A', 0, 0);
467 #endif /* OVERLOAD */
469 if (strEQ(name, "SIG")) {
474 hv_magic(hv, siggv, 'S');
476 /* initialize signal stack */
477 signalstack = newAV();
478 AvREAL_off(signalstack);
479 av_extend(signalstack, 30);
480 av_fill(signalstack, 0);
508 sv_setpv(GvSV(gv),chopset);
513 if (dowarn && len == 1 && sv_type == SVt_PV)
514 warn("Use of $%s is deprecated", name);
556 SvREADONLY_on(GvSV(gv));
558 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
564 sv_setpv(GvSV(gv),"\f");
570 sv_setpv(GvSV(gv),"\034");
576 sv_upgrade(sv, SVt_PVNV);
577 sv_setpv(sv, patchlevel);
589 HV *hv = GvSTASH(gv);
593 sv_setpv(sv, sv == (SV*)gv ? "*" : "");
594 sv_catpv(sv,HvNAME(hv));
595 sv_catpvn(sv,"::", 2);
596 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
613 sv_setpv(sv, sv == (SV*)gv ? "*" : "");
614 sv_catpv(sv,HvNAME(hv));
615 sv_catpvn(sv,"::", 2);
616 sv_catpvn(sv,GvNAME(egv),GvNAMELEN(egv));
625 io = (IO*)NEWSV(0,0);
626 sv_upgrade((SV *)io,SVt_PVIO);
629 iogv = gv_fetchpv("FileHandle::", TRUE, SVt_PVIO);
630 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
646 for (i = 0; i <= (I32) HvMAX(stash); i++) {
647 for (entry = HvARRAY(stash)[i]; entry; entry = entry->hent_next) {
648 if (entry->hent_key[entry->hent_klen-1] == ':' &&
649 (gv = (GV*)entry->hent_val) && (hv = GvHV(gv)) && HvNAME(hv))
652 gv_check(hv); /* nested package */
654 else if (isALPHA(*entry->hent_key)) {
655 gv = (GV*)entry->hent_val;
658 curcop->cop_line = GvLINE(gv);
659 filegv = GvFILEGV(gv);
660 curcop->cop_filegv = filegv;
661 if (filegv && SvMULTI(filegv)) /* Filename began with slash */
663 warn("Identifier \"%s::%s\" used only once: possible typo",
664 HvNAME(stash), GvNAME(gv));
674 (void)sprintf(tokenbuf,"%s::_GEN_%ld",pack,(long)gensym++);
675 return gv_fetchpv(tokenbuf,TRUE, SVt_PVGV);
678 /* hopefully this is only called on local symbol table entries */
697 if (!gv || !(gp = GvGP(gv)))
699 if (gp->gp_refcnt == 0) {
700 warn("Attempt to free unreferenced glob pointers");
703 if (--gp->gp_refcnt > 0) {
704 if (gp->gp_egv == gv)
709 SvREFCNT_dec(gp->gp_sv);
710 SvREFCNT_dec(gp->gp_av);
711 SvREFCNT_dec(gp->gp_hv);
712 if ((io = gp->gp_io) && SvTYPE(io) != SVTYPEMASK) {
716 if ((cv = gp->gp_cv) && !GvCVGEN(gv))
718 SvREFCNT_dec(gp->gp_form);
724 #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
728 #ifdef MICROPORT /* Microport 2.4 hack */
733 return GvGP(gv)->gp_av;
735 return GvGP(gv_AVadd(gv))->gp_av;
742 return GvGP(gv)->gp_hv;
744 return GvGP(gv_HVadd(gv))->gp_hv;
746 #endif /* Microport 2.4 hack */
749 /* Updates and caches the CV's */
759 MAGIC* mg=mg_find((SV*)stash,'c');
760 AMT *amtp=mg ? (AMT*)mg->mg_ptr: NULL;
762 if (mg && (amtp=((AMT*)(mg->mg_ptr)))->was_ok_am == amagic_generation &&
763 amtp->was_ok_sub == sub_generation)
764 return HV_AMAGIC(stash)? TRUE: FALSE;
765 gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE);
766 if (amtp && amtp->table) {
768 for (i=1;i<NofAMmeth*2;i++) {
769 if (amtp->table[i]) {
770 SvREFCNT_dec(amtp->table[i]);
774 sv_unmagic((SV*)stash, 'c');
776 DEBUG_o( deb("Recalcing overload magic in package %s\n",HvNAME(stash)) );
778 if (gvp && ((gv = *gvp) != (GV*)&sv_undef && (hv = GvHV(gv)))) {
786 /* if (*(svp)==(SV*)amagic_generation && *(svp+1)==(SV*)sub_generation) {
787 DEBUG_o( deb("Overload magic in package %s up-to-date\n",HvNAME(stash))
789 return HV_AMAGIC(stash)? TRUE: FALSE;
792 amt.was_ok_am=amagic_generation;
793 amt.was_ok_sub=sub_generation;
794 amt.fallback=AMGfallNO;
796 /* Work with "fallback" key, which we assume to be first in AMG_names */
798 if ((cp=((char**)(*AMG_names))[0]) &&
799 (svp=(SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
800 if (SvTRUE(sv)) amt.fallback=AMGfallYES;
801 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
804 for (i=1;i<NofAMmeth*2;i++) {
807 if ( (cp=((char**)(*AMG_names))[i]) ) {
808 svp=(SV**)hv_fetch(hv,cp,strlen(cp),FALSE);
809 if (svp && ((sv = *svp) != (GV*)&sv_undef)) {
810 switch (SvTYPE(sv)) {
813 if (!SvOK(sv)) break;
814 gv = gv_fetchmethod(stash, SvPV(sv, na));
815 if (gv) cv = GvCV(gv);
819 if (SvTYPE(cv) == SVt_PVCV)
824 die("Not a subroutine reference in %%OVERLOAD");
830 if (!(cv = GvCV((GV*)sv)))
831 cv = sv_2cv(sv, &stash, &gv, TRUE);
836 die("Method for operation %s not found in package %.200s during blessing\n",
842 amt.table[i]=(CV*)SvREFCNT_inc(cv);
844 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(amt));
846 /* HV_badAMAGIC_off(stash);*/
851 /*HV_badAMAGIC_off(stash);*/
852 HV_AMAGIC_off(stash);
856 /* During call to this subroutine stack can be reallocated. It is
857 * advised to call SPAGAIN macro in your code after call */
860 amagic_call(left,right,method,flags)
868 CV **cvp=NULL, **ocvp=NULL;
870 int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
871 int postpr=0, inc_dec_ass=0, assignshift=assign?1:0;
873 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
874 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
875 && (ocvp = cvp = ((oamtp=amtp=(AMT*)mg->mg_ptr)->table))
876 && ((cv = cvp[off=method+assignshift])
877 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
879 (fl = 1, cv = cvp[off=method])))) {
880 lr = -1; /* Call method for left argument */
882 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
885 /* look for substituted methods */
888 if (((cv = cvp[off=add_ass_amg]) && (inc_dec_ass=1))
889 || ((cv = cvp[off=add_amg]) && (postpr=1))) {
890 right = &sv_yes; lr = -1; assign = 1;
894 if (((cv = cvp[off=subtr_ass_amg]) && (inc_dec_ass=1))
895 || ((cv = cvp[off=subtr_amg]) && (postpr=1))) {
896 right = &sv_yes; lr = -1; assign = 1;
900 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
903 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
906 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
911 if (!SvROK(ref) && SvTYPE(ref) <= SVt_PVMG) { /* Just to be
918 SV* newref = newSVsv(ref);
920 SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(ref));
926 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
927 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
928 SV* nullsv=sv_2mortal(newSViv(0));
930 SV* lessp = amagic_call(left,nullsv,
931 lt_amg,AMGf_noright);
932 logic = SvTRUE(lessp);
934 SV* lessp = amagic_call(left,nullsv,
935 ncmp_amg,AMGf_noright);
936 logic = (SvNV(lessp) < 0);
939 if (off==subtr_amg) {
950 if (cv = cvp[off=subtr_amg]) {
952 left = sv_2mortal(newSViv(0));
959 if (!cv) goto not_found;
960 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
961 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
962 && (cvp = ((amtp=(AMT*)mg->mg_ptr)->table))
963 && (cv = cvp[off=method])) { /* Method for right
966 } else if (((ocvp && oamtp->fallback > AMGfallNEVER
967 && (cvp=ocvp) && (lr=-1))
968 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
969 && !(flags & AMGf_unary)) {
970 /* We look for substitution for
971 * comparison operations and
973 if (method==concat_amg || method==concat_ass_amg
974 || method==repeat_amg || method==repeat_ass_amg) {
975 return NULL; /* Delegate operation to string conversion */
985 postpr = 1; off=ncmp_amg; break;
992 postpr = 1; off=scmp_amg; break;
994 if (off != -1) cv = cvp[off];
999 not_found: /* No method found, either report or die */
1000 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
1001 notfound = 1; lr = -1;
1002 } else if (cvp && (cv=cvp[nomethod_amg])) {
1003 notfound = 1; lr = 1;
1006 if (off==-1) off=method;
1007 sprintf(tmpstr,"Operation `%s': no method found,\n\tleft argument %s%.200s,\n\tright argument %s%.200s",
1008 ((char**)AMG_names)[off],
1010 "in overloaded package ":
1011 "has no overloaded magic",
1013 HvNAME(SvSTASH(SvRV(left))):
1016 "in overloaded package ":
1017 "has no overloaded magic",
1019 HvNAME(SvSTASH(SvRV(right))):
1021 if (amtp && amtp->fallback >= AMGfallYES) {
1022 DEBUG_o( deb(tmpstr) );
1031 DEBUG_o( deb("Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %.200s%s\n",
1032 ((char**)AMG_names)[off],
1033 method+assignshift==off? "" :
1035 method+assignshift==off? "" :
1036 ((char**)AMG_names)[method+assignshift],
1037 method+assignshift==off? "" : "')",
1038 flags & AMGf_unary? "" :
1039 lr==1 ? " for right argument": " for left argument",
1040 flags & AMGf_unary? " for argument" : "",
1042 fl? ",\n\tassignment variant used": "") );
1043 /* Since we use shallow copy during assignment, we need
1044 * to dublicate the contents, probably calling user-supplied
1045 * version of copy operator
1047 if ((method+assignshift==off
1048 && (assign || method==inc_amg || method==dec_amg))
1049 || inc_dec_ass) RvDEEPCP(left);
1056 Zero(&myop, 1, BINOP);
1057 myop.op_last = (OP *) &myop;
1058 myop.op_next = Nullop;
1059 myop.op_flags = OPf_KNOW|OPf_STACKED;
1067 EXTEND(sp, notfound + 5);
1068 PUSHs(lr>0? right: left);
1069 PUSHs(lr>0? left: right);
1070 PUSHs( assign ? &sv_undef : (lr>0? &sv_yes: &sv_no));
1072 PUSHs( sv_2mortal(newSVpv(((char**)AMG_names)[off],0)) );
1077 if (op = pp_entersub())
1086 /* sv_2mortal(res); */
1095 ans=SvIV(res)<=0; break;
1098 ans=SvIV(res)<0; break;
1101 ans=SvIV(res)>=0; break;
1104 ans=SvIV(res)>0; break;
1107 ans=SvIV(res)==0; break;
1110 ans=SvIV(res)!=0; break;
1113 SvSetSV(left,res); return res; break;
1115 return ans? &sv_yes: &sv_no;
1116 } else if (method==copy_amg) {
1118 die("Copy method did not return a reference");
1120 return SvREFCNT_inc(SvRV(res));
1126 #endif /* OVERLOAD */