1 /* $RCSfile: gv.c,v $$Revision: 4.1 $$Date: 92/08/07 18:26:39 $
3 * Copyright (c) 1991, 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.
9 * Revision 4.1 92/08/07 18:26:39 lwall
11 * Revision 4.0.1.4 92/06/08 15:32:19 lwall
12 * patch20: fixed confusion between a *var's real name and its effective name
13 * patch20: the debugger now warns you on lines that can't set a breakpoint
14 * patch20: the debugger made perl forget the last pattern used by //
15 * patch20: paragraph mode now skips extra newlines automatically
16 * patch20: ($<,$>) = ... didn't work on some architectures
18 * Revision 4.0.1.3 91/11/05 18:35:33 lwall
19 * patch11: length($x) was sometimes wrong for numeric $x
20 * patch11: perl now issues warning if $SIG{'ALARM'} is referenced
21 * patch11: *foo = undef coredumped
22 * patch11: solitary subroutine references no longer trigger typo warnings
23 * patch11: local(*FILEHANDLE) had a memory leak
25 * Revision 4.0.1.2 91/06/07 11:55:53 lwall
26 * patch4: new copyright notice
27 * patch4: added $^P variable to control calling of perldb routines
28 * patch4: added $^F variable to specify maximum system fd, default 2
29 * patch4: $` was busted inside s///
30 * patch4: default top-of-form run_format is now FILEHANDLE_TOP
31 * patch4: length($`), length($&), length($') now optimized to avoid string copy
32 * patch4: $^D |= 1024 now does syntax tree dump at run-time
34 * Revision 4.0.1.1 91/04/12 09:10:24 lwall
35 * patch1: Configure now differentiates getgroups() type from getgid() type
36 * patch1: you may now use "die" and "caller" in a signal handler
38 * Revision 4.0 91/03/20 01:39:41 lwall
73 sprintf(tmpbuf,"'_<%s", name);
74 gv = gv_fetchpv(tmpbuf, TRUE);
75 sv_setpv(GvSV(gv), name);
77 hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
82 gv_init(gv, stash, name, len, multi)
91 sv_upgrade(gv, SVt_PVGV);
97 GvSV(gv) = NEWSV(72,0);
98 GvLINE(gv) = curcop->cop_line;
100 sv_magic((SV*)gv, (SV*)gv, '*', name, len);
102 GvNAME(gv) = nsavestr(name, len);
109 gv_fetchmeth(stash, name, len)
119 gvp = (GV**)hv_fetch(stash, name, len, TRUE);
121 DEBUG_o( deb("Looking for method %s in package %s\n",name,HvNAME(stash)) );
123 if (SvTYPE(topgv) != SVt_PVGV)
124 gv_init(topgv, stash, name, len, TRUE);
127 if (!GvCVGEN(topgv) || GvCVGEN(topgv) >= sub_generation)
131 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
132 if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
133 SV** svp = AvARRAY(av);
134 I32 items = AvFILL(av) + 1;
137 HV* basestash = fetch_stash(sv, FALSE);
140 warn("Can't locate package %s for @%s'ISA",
141 SvPVX(sv), HvNAME(stash));
144 gv = gv_fetchmeth(basestash, name, len);
146 GvCV(topgv) = GvCV(gv); /* cache the CV */
147 GvCVGEN(topgv) = sub_generation; /* valid for now */
156 gv_fetchmethod(stash, name)
162 for (nend = name; *nend; nend++) {
163 if (*nend == ':' || *nend == '\'') {
164 return gv_fetchpv(name, FALSE);
167 return gv_fetchmeth(stash, name, nend - name);
171 gv_fetchpv(nambeg,add)
175 register char *name = nambeg;
179 register char *namend;
184 for (namend = name; *namend; namend++) {
185 if ((*namend == '\'' && namend[1]) ||
186 (*namend == ':' && namend[1] == ':'))
190 Copy(name, tmpbuf+1, len, char);
197 gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
198 if (!gvp || *gvp == (GV*)&sv_undef)
201 if (SvTYPE(gv) == SVt_PVGV)
204 gv_init(gv, stash, nambeg, namend - nambeg, (add & 2));
205 if (!(stash = GvHV(gv)))
206 stash = GvHV(gv) = newHV();
208 HvNAME(stash) = nsavestr(nambeg, namend - nambeg);
216 return gv ? gv : defgv;
220 /* No stash in name, so see how we can default */
223 if (isIDFIRST(*name)) {
224 if (isUPPER(*name)) {
226 if (*name == 'S' && (
227 strEQ(name, "SIG") ||
228 strEQ(name, "STDIN") ||
229 strEQ(name, "STDOUT") ||
230 strEQ(name, "STDERR") ))
233 else if (*name > 'E') {
234 if (*name == 'I' && strEQ(name, "INC"))
237 else if (*name > 'A') {
238 if (*name == 'E' && strEQ(name, "ENV"))
241 else if (*name == 'A' && (
242 strEQ(name, "ARGV") ||
243 strEQ(name, "ARGVOUT") ))
246 else if (*name == '_' && !name[1])
250 else if ((COP*)curcop == &compiling)
253 stash = curcop->cop_stash;
259 /* By this point we should have a stash and a name */
262 croak("Global symbol \"%s\" requires explicit package name", name);
266 gvp = (GV**)hv_fetch(stash,name,len,add);
267 if (!gvp || *gvp == (GV*)&sv_undef)
270 if (SvTYPE(gv) == SVt_PVGV) {
275 /* Adding a new symbol */
277 gv_init(gv, stash, name, len, add & 2);
279 /* set up magic where warranted */
282 if (strEQ(name, "ISA")) {
284 sv_magic((SV*)av, (SV*)gv, 'I', 0, 0);
288 if (strEQ(name, "SIG")) {
293 hv_magic(hv, siggv, 'S');
295 /* initialize signal stack */
296 signalstack = newAV();
297 av_store(signalstack, 32, Nullsv);
298 av_clear(signalstack);
299 AvREAL_off(signalstack);
327 sv_setpv(GvSV(gv),chopset);
370 sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
376 sv_setpv(GvSV(gv),"\f");
382 sv_setpv(GvSV(gv),"\034");
388 sv_upgrade(sv, SVt_PVNV);
390 SvNVX(sv) = atof(patchlevel);
403 HV *hv = GvSTASH(gv);
407 sv_setpv(sv, sv == (SV*)gv ? "*" : "");
408 sv_catpv(sv,HvNAME(hv));
409 sv_catpvn(sv,"::", 2);
410 sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
419 HV *hv = GvSTASH(egv);
423 sv_setpv(sv, sv == (SV*)gv ? "*" : "");
424 sv_catpv(sv,HvNAME(hv));
425 sv_catpvn(sv,"::", 2);
426 sv_catpvn(sv,GvNAME(egv),GvNAMELEN(egv));
448 for (i = 0; i <= HvMAX(stash); i++) {
449 for (entry = HvARRAY(stash)[i]; entry; entry = entry->hent_next) {
450 if (isALPHA(*entry->hent_key)) {
451 gv = (GV*)entry->hent_val;
454 curcop->cop_line = GvLINE(gv);
455 warn("Possible typo: \"%s::%s\"", HvNAME(stash), GvNAME(gv));
457 else if (*entry->hent_key == '_' &&
458 (gv = (GV*)entry->hent_val) &&
459 (hv = GvHV(gv)) && HvNAME(hv) && hv != defstash)
460 gv_check(hv); /* nested package */
469 (void)sprintf(tokenbuf,"_GEN_%d",gensym++);
470 return gv_fetchpv(tokenbuf,TRUE);
473 /* hopefully this is only called on local symbol table entries */
492 if (!gv || !(gp = GvGP(gv)))
494 if (gp->gp_refcnt == 0) {
495 warn("Attempt to free unreferenced glob pointers");
498 if (--gp->gp_refcnt > 0)
501 sv_free((SV*)gp->gp_sv);
502 sv_free((SV*)gp->gp_av);
503 sv_free((SV*)gp->gp_hv);
504 if (io = gp->gp_io) {
506 Safefree(io->top_name);
507 Safefree(io->fmt_name);
516 #if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
520 #ifdef MICROPORT /* Microport 2.4 hack */
525 return GvGP(gv)->gp_av;
527 return GvGP(gv_AVadd(gv))->gp_av;
534 return GvGP(gv)->gp_hv;
536 return GvGP(gv_HVadd(gv))->gp_hv;
538 #endif /* Microport 2.4 hack */
545 if (op->op_private < num)
547 if (op->op_flags & OPf_STACKED)
548 return gv_fetchpv(SvPVx(*(stack_sp--), na),TRUE);
560 if (op->op_private < num)
562 if (op->op_flags & OPf_STACKED)
563 gv = gv_fetchpv(SvPVx(*(stack_sp--), na),TRUE);