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)
136 croak("Recursive inheritance detected");
138 gvp = (GV**)hv_fetch(stash, name, len, TRUE);
140 DEBUG_o( deb("Looking for method %s in package %s\n",name,HvNAME(stash)) );
142 if (SvTYPE(topgv) != SVt_PVGV)
143 gv_init(topgv, stash, name, len, TRUE);
146 if (!GvCVGEN(topgv) || GvCVGEN(topgv) >= sub_generation)
150 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
151 if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
152 SV** svp = AvARRAY(av);
153 I32 items = AvFILL(av) + 1;
156 HV* basestash = gv_stashsv(sv, FALSE);
159 warn("Can't locate package %s for @%s::ISA",
160 SvPVX(sv), HvNAME(stash));
163 gv = gv_fetchmeth(basestash, name, len, level + 1);
165 GvCV(topgv) = GvCV(gv); /* cache the CV */
166 GvCVGEN(topgv) = sub_generation; /* valid for now */
173 if (lastchance = gv_stashpv("UNIVERSAL", FALSE)) {
174 if (gv = gv_fetchmeth(lastchance, name, len, level + 1)) {
175 GvCV(topgv) = GvCV(gv); /* cache the CV */
176 GvCVGEN(topgv) = sub_generation; /* valid for now */
186 gv_fetchmethod(stash, name)
194 for (nend = name; *nend; nend++) {
195 if (*nend == ':' || *nend == '\'')
200 char *origname = name;
206 stash = gv_stashpv(origname,TRUE);
209 gv = gv_fetchmeth(stash, name, nend - name, 0);
213 if (strEQ(name,"import") || strEQ(name,"unimport"))
215 else if (strNE(name, "AUTOLOAD")) {
216 gv = gv_fetchmeth(stash, "AUTOLOAD", 8, 0);
217 if (gv && (cv = GvCV(gv))) { /* One more chance... */
218 SV *tmpstr = sv_newmortal();
219 sv_catpv(tmpstr,HvNAME(stash));
220 sv_catpvn(tmpstr,"::", 2);
221 sv_catpvn(tmpstr, name, nend - name);
222 sv_setsv(GvSV(CvGV(cv)), tmpstr);
230 gv_stashpv(name,create)
237 sprintf(tmpbuf,"%.*s::",1200,name);
238 tmpgv = gv_fetchpv(tmpbuf,create, SVt_PVHV);
242 GvHV(tmpgv) = newHV();
245 HvNAME(stash) = savepv(name);
250 gv_stashsv(sv,create)
254 return gv_stashpv(SvPV(sv,na), create);
259 gv_fetchpv(nambeg,add,sv_type)
264 register char *name = nambeg;
268 register char *namend;
273 for (namend = name; *namend; namend++) {
274 if ((*namend == '\'' && namend[1]) ||
275 (*namend == ':' && namend[1] == ':'))
279 if (!SvREFCNT(stash)) /* symbol table under destruction */
284 New(601, tmpbuf, len+3, char);
285 Copy(name, tmpbuf, len, char);
289 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
291 if (!gvp || *gvp == (GV*)&sv_undef)
295 if (SvTYPE(gv) == SVt_PVGV)
300 gv_init(gv, stash, nambeg, namend - nambeg, (add & 2));
302 if (!(stash = GvHV(gv)))
303 stash = GvHV(gv) = newHV();
306 HvNAME(stash) = savepvn(nambeg, namend - nambeg);
314 return gv ? gv : *hv_fetch(defstash, "main::", 6, TRUE);
321 /* No stash in name, so see how we can default */
324 if (isIDFIRST(*name)) {
325 if (isUPPER(*name)) {
327 if (*name == 'S' && (
328 strEQ(name, "SIG") ||
329 strEQ(name, "STDIN") ||
330 strEQ(name, "STDOUT") ||
331 strEQ(name, "STDERR") ))
334 else if (*name > 'E') {
335 if (*name == 'I' && strEQ(name, "INC"))
338 else if (*name > 'A') {
339 if (*name == 'E' && strEQ(name, "ENV"))
342 else if (*name == 'A' && (
343 strEQ(name, "ARGV") ||
344 strEQ(name, "ARGVOUT") ))
347 else if (*name == '_' && !name[1])
351 else if ((COP*)curcop == &compiling) {
353 if (add && (hints & HINT_STRICT_VARS) && sv_type != SVt_PVCV) {
354 if (stash && !hv_fetch(stash,name,len,0))
359 stash = curcop->cop_stash;
365 /* By this point we should have a stash and a name */
369 warn("Global symbol \"%s\" requires explicit package name", name);
371 stash = curstash ? curstash : defstash; /* avoid core dumps */
377 if (!SvREFCNT(stash)) /* symbol table under destruction */
380 gvp = (GV**)hv_fetch(stash,name,len,add);
381 if (!gvp || *gvp == (GV*)&sv_undef)
384 if (SvTYPE(gv) == SVt_PVGV) {
387 gv_init_sv(gv, sv_type);
392 /* Adding a new symbol */
395 warn("Had to create %s unexpectedly", nambeg);
396 gv_init(gv, stash, name, len, add & 2);
397 gv_init_sv(gv, sv_type);
399 /* set up magic where warranted */
402 if (strEQ(name, "ARGV")) {
403 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
413 if (strnEQ(name, "EXPORT", 6))
417 if (strEQ(name, "ISA")) {
420 sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
421 if (add & 2 && strEQ(nambeg,"AnyDBM_File::ISA") && AvFILL(av) == -1)
424 av_push(av, newSVpv(pname = "NDBM_File",0));
425 gv_stashpv(pname, TRUE);
426 av_push(av, newSVpv(pname = "DB_File",0));
427 gv_stashpv(pname, TRUE);
428 av_push(av, newSVpv(pname = "GDBM_File",0));
429 gv_stashpv(pname, TRUE);
430 av_push(av, newSVpv(pname = "SDBM_File",0));
431 gv_stashpv(pname, TRUE);
432 av_push(av, newSVpv(pname = "ODBM_File",0));
433 gv_stashpv(pname, TRUE);
439 if (strEQ(name, "OVERLOAD")) {
442 sv_magic((SV*)hv, (SV*)gv, 'A', 0, 0);
445 #endif /* OVERLOAD */
447 if (strEQ(name, "SIG")) {
452 hv_magic(hv, siggv, 'S');
454 /* initialize signal stack */
455 signalstack = newAV();
456 AvREAL_off(signalstack);
457 av_extend(signalstack, 30);
458 av_fill(signalstack, 0);
486 sv_setpv(GvSV(gv),chopset);
491 if (dowarn && len == 1 && sv_type == SVt_PV)
492 warn("Use of $%s is deprecated", name);
533 SvREADONLY_on(GvSV(gv));
535 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
541 sv_setpv(GvSV(gv),"\f");
547 sv_setpv(GvSV(gv),"\034");
553 sv_upgrade(sv, SVt_PVNV);
554 sv_setpv(sv, patchlevel);
566 HV *hv = GvSTASH(gv);
570 sv_setpv(sv, sv == (SV*)gv ? "*" : "");
571 sv_catpv(sv,HvNAME(hv));
572 sv_catpvn(sv,"::", 2);
573 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
582 HV *hv = GvSTASH(egv);
586 sv_setpv(sv, sv == (SV*)gv ? "*" : "");
587 sv_catpv(sv,HvNAME(hv));
588 sv_catpvn(sv,"::", 2);
589 sv_catpvn(sv,GvNAME(egv),GvNAMELEN(egv));
598 io = (IO*)NEWSV(0,0);
599 sv_upgrade((SV *)io,SVt_PVIO);
602 iogv = gv_fetchpv("FileHandle::", TRUE, SVt_PVIO);
603 SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
619 for (i = 0; i <= (I32) HvMAX(stash); i++) {
620 for (entry = HvARRAY(stash)[i]; entry; entry = entry->hent_next) {
621 if (entry->hent_key[entry->hent_klen-1] == ':' &&
622 (gv = (GV*)entry->hent_val) && (hv = GvHV(gv)) && HvNAME(hv))
625 gv_check(hv); /* nested package */
627 else if (isALPHA(*entry->hent_key)) {
628 gv = (GV*)entry->hent_val;
631 curcop->cop_line = GvLINE(gv);
632 filegv = GvFILEGV(gv);
633 curcop->cop_filegv = filegv;
634 if (filegv && SvMULTI(filegv)) /* Filename began with slash */
636 warn("Identifier \"%s::%s\" used only once: possible typo",
637 HvNAME(stash), GvNAME(gv));
647 (void)sprintf(tokenbuf,"%s::_GEN_%ld",pack,(long)gensym++);
648 return gv_fetchpv(tokenbuf,TRUE, SVt_PVGV);
651 /* hopefully this is only called on local symbol table entries */
670 if (!gv || !(gp = GvGP(gv)))
672 if (gp->gp_refcnt == 0) {
673 warn("Attempt to free unreferenced glob pointers");
676 if (--gp->gp_refcnt > 0)
679 SvREFCNT_dec(gp->gp_sv);
680 SvREFCNT_dec(gp->gp_av);
681 SvREFCNT_dec(gp->gp_hv);
682 if ((io = gp->gp_io) && SvTYPE(io) != SVTYPEMASK) {
686 if ((cv = gp->gp_cv) && !GvCVGEN(gv))
692 #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
696 #ifdef MICROPORT /* Microport 2.4 hack */
701 return GvGP(gv)->gp_av;
703 return GvGP(gv_AVadd(gv))->gp_av;
710 return GvGP(gv)->gp_hv;
712 return GvGP(gv_HVadd(gv))->gp_hv;
714 #endif /* Microport 2.4 hack */
717 /* Updates and caches the CV's */
727 MAGIC* mg=mg_find((SV*)stash,'c');
730 if (mg && (amtp=((AMT*)(mg->mg_ptr)))->was_ok_am == amagic_generation &&
731 amtp->was_ok_sub == sub_generation)
732 return HV_AMAGIC(stash)? TRUE: FALSE;
733 gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE);
734 sv_unmagic((SV*)stash, 'c');
736 DEBUG_o( deb("Recalcing overload magic in package %s\n",HvNAME(stash)) );
738 if (gvp && ((gv = *gvp) != (GV*)&sv_undef && (hv = GvHV(gv)))) {
746 /* if (*(svp)==(SV*)amagic_generation && *(svp+1)==(SV*)sub_generation) {
747 DEBUG_o( deb("Overload magic in package %s up-to-date\n",HvNAME(stash))
749 return HV_AMAGIC(stash)? TRUE: FALSE;
752 amt.was_ok_am=amagic_generation;
753 amt.was_ok_sub=sub_generation;
754 amt.fallback=AMGfallNO;
756 /* Work with "fallback" key, which we assume to be first in AMG_names */
758 if ((cp=((char**)(*AMG_names))[0]) &&
759 (svp=(SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
760 if (SvTRUE(sv)) amt.fallback=AMGfallYES;
761 else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
764 for (i=1;i<NofAMmeth*2;i++) {
767 if ( (cp=((char**)(*AMG_names))[i]) ) {
768 svp=(SV**)hv_fetch(hv,cp,strlen(cp),FALSE);
769 if (svp && ((sv = *svp) != (GV*)&sv_undef)) {
770 switch (SvTYPE(sv)) {
773 if (!SvOK(sv)) break;
774 gv = gv_fetchmethod(curcop->cop_stash, SvPV(sv, na));
775 if (gv) cv = GvCV(gv);
779 if (SvTYPE(cv) == SVt_PVCV)
784 die("Not a subroutine reference in %%OVERLOAD");
790 if (!(cv = GvCV((GV*)sv)))
791 cv = sv_2cv(sv, &stash, &gv, TRUE);
796 die("Method for operation %s not found in package %s during blessing\n",
804 sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(amt));
806 /* HV_badAMAGIC_off(stash);*/
811 /*HV_badAMAGIC_off(stash);*/
812 HV_AMAGIC_off(stash);
816 /* During call to this subroutine stack can be reallocated. It is
817 * advised to call SPAGAIN macro in your code after call */
820 amagic_call(left,right,method,flags)
828 CV **cvp=NULL, **ocvp=NULL;
830 int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
833 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
834 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
835 && (ocvp = cvp = ((oamtp=amtp=(AMT*)mg->mg_ptr)->table))
837 ((cv = cvp[off=method+1])
838 || ( amtp->fallback > AMGfallNEVER && /* fallback to
840 (fl = 1, cv = cvp[off=method]))):
841 (1 && (cv = cvp[off=method])) )) {
842 lr = -1; /* Call method for left argument */
844 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
847 /* look for substituted methods */
850 if ((cv = cvp[off=add_ass_amg])
851 || ((cv = cvp[off=add_amg]) && (postpr=1))) {
852 right = &sv_yes; lr = -1; assign = 1;
856 if ((cv = cvp[off=subtr_ass_amg])
857 || ((cv = cvp[off=subtr_amg]) && (postpr=1))) {
858 right = &sv_yes; lr = -1; assign = 1;
862 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
865 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
868 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
871 if ((cvp[off1=lt_amg] || cvp[off1=lt_amg])
872 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
874 SV* lessp = amagic_call(left,
875 sv_2mortal(newSViv(0)),
876 lt_amg,AMGf_noright);
877 logic = SvTRUE(lessp);
879 SV* lessp = amagic_call(left,
880 sv_2mortal(newSViv(0)),
881 ncmp_amg,AMGf_noright);
882 logic = (SvNV(lessp) < 0);
885 if (off==subtr_amg) {
887 left = sv_2mortal(newSViv(0));
896 if (cv = cvp[off=subtr_amg]) {
898 left = sv_2mortal(newSViv(0));
905 if (!cv) goto not_found;
906 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
907 && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
908 && (cvp = ((amtp=(AMT*)mg->mg_ptr)->table))
909 && (cv = cvp[off=method])) { /* Method for right
912 } else if (((ocvp && oamtp->fallback > AMGfallNEVER && (cvp=ocvp))
913 || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
914 && !(flags & AMGf_unary)) {
915 /* We look for substitution for
916 * comparison operations and
918 if (method==concat_amg || method==concat_ass_amg
919 || method==repeat_amg || method==repeat_ass_amg) {
920 return NULL; /* Delegate operation to string conversion */
930 postpr = 1; off=ncmp_amg; break;
937 postpr = 1; off=scmp_amg; break;
939 if (off != -1) cv = cvp[off];
944 not_found: /* No method found, either report or die */
945 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
946 notfound = 1; lr = -1;
947 } else if (cvp && (cv=cvp[nomethod_amg])) {
948 notfound = 1; lr = 1;
951 sprintf(tmpstr,"Operation `%s': no method found,\n\tleft argument %s%200s,\n\tright argument %s%200s",
952 ((char**)AMG_names)[off],
954 "in overloaded package ":
955 "has no overloaded magic",
957 HvNAME(SvSTASH(SvRV(left))):
960 "in overloaded package ":
961 "has no overloaded magic",
963 HvNAME(SvSTASH(SvRV(right))):
965 if (amtp && amtp->fallback >= AMGfallYES) {
966 DEBUG_o( deb(tmpstr) );
975 DEBUG_o( deb("Operation `%s': method for %s argument found in package %s%s\n",
976 ((char**)AMG_names)[off],
977 (lr? "right": "left"),
979 fl? ",\n\tassignment variant used": "") );
980 /* Since we use shallow copy, we need to dublicate the contents,
981 probably we need also to use user-supplied version of coping?
983 if (assign || method==inc_amg || method==dec_amg) RvDEEPCP(left);
990 Zero(&myop, 1, BINOP);
991 myop.op_last = (OP *) &myop;
992 myop.op_next = Nullop;
993 myop.op_flags = OPf_KNOW|OPf_STACKED;
1001 EXTEND(sp, notfound + 5);
1002 PUSHs(lr>0? right: left);
1003 PUSHs(lr>0? left: right);
1004 PUSHs( assign ? &sv_undef : (lr>0? &sv_yes: &sv_no));
1006 PUSHs( sv_2mortal(newSVpv(((char**)AMG_names)[off],0)) );
1011 if (op = pp_entersub())
1020 /* sv_2mortal(res); */
1029 ans=SvIV(res)<=0; break;
1032 ans=SvIV(res)<0; break;
1035 ans=SvIV(res)>=0; break;
1038 ans=SvIV(res)>0; break;
1041 ans=SvIV(res)==0; break;
1044 ans=SvIV(res)!=0; break;
1047 SvSetSV(left,res); return res; break;
1049 return ans? &sv_yes: &sv_no;
1055 #endif /* OVERLOAD */