-/* $RCSfile: gv.c,v $$Revision: 4.1 $$Date: 92/08/07 18:26:39 $
+/* gv.c
*
- * Copyright (c) 1991, Larry Wall
+ * Copyright (c) 1991-1994, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
- * $Log: gv.c,v $
- * Revision 4.1 92/08/07 18:26:39 lwall
- *
- * Revision 4.0.1.4 92/06/08 15:32:19 lwall
- * patch20: fixed confusion between a *var's real name and its effective name
- * patch20: the debugger now warns you on lines that can't set a breakpoint
- * patch20: the debugger made perl forget the last pattern used by //
- * patch20: paragraph mode now skips extra newlines automatically
- * patch20: ($<,$>) = ... didn't work on some architectures
- *
- * Revision 4.0.1.3 91/11/05 18:35:33 lwall
- * patch11: length($x) was sometimes wrong for numeric $x
- * patch11: perl now issues warning if $SIG{'ALARM'} is referenced
- * patch11: *foo = undef coredumped
- * patch11: solitary subroutine references no longer trigger typo warnings
- * patch11: local(*FILEHANDLE) had a memory leak
- *
- * Revision 4.0.1.2 91/06/07 11:55:53 lwall
- * patch4: new copyright notice
- * patch4: added $^P variable to control calling of perldb routines
- * patch4: added $^F variable to specify maximum system fd, default 2
- * patch4: $` was busted inside s///
- * patch4: default top-of-form run_format is now FILEHANDLE_TOP
- * patch4: length($`), length($&), length($') now optimized to avoid string copy
- * patch4: $^D |= 1024 now does syntax tree dump at run-time
- *
- * Revision 4.0.1.1 91/04/12 09:10:24 lwall
- * patch1: Configure now differentiates getgroups() type from getgid() type
- * patch1: you may now use "die" and "caller" in a signal handler
- *
- * Revision 4.0 91/03/20 01:39:41 lwall
- * 4.0 baseline.
- *
+ */
+
+/*
+ * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
+ * of your inquisitiveness, I shall spend all the rest of my days answering
+ * you. What more do you want to know?'
+ * 'The names of all the stars, and of all living things, and the whole
+ * history of Middle-earth and Over-heaven and of the Sundering Seas,'
+ * laughed Pippin.
*/
#include "EXTERN.h"
gv_AVadd(gv)
register GV *gv;
{
+ if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
+ croak("Bad symbol for array");
if (!GvAV(gv))
GvAV(gv) = newAV();
return gv;
gv_HVadd(gv)
register GV *gv;
{
+ if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
+ croak("Bad symbol for hash");
if (!GvHV(gv))
GvHV(gv) = newHV();
return gv;
}
GV *
+gv_IOadd(gv)
+register GV *gv;
+{
+ if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
+ croak("Bad symbol for filehandle");
+ if (!GvIOp(gv))
+ GvIOp(gv) = newIO();
+ return gv;
+}
+
+GV *
gv_fetchfile(name)
char *name;
{
char tmpbuf[1200];
GV *gv;
- sprintf(tmpbuf,"'_<%s", name);
- gv = gv_fetchpv(tmpbuf, TRUE);
+ sprintf(tmpbuf,"::_<%s", name);
+ gv = gv_fetchpv(tmpbuf, TRUE, SVt_PVGV);
sv_setpv(GvSV(gv), name);
+ if (*name == '/' && (instr(name,"/lib/") || instr(name,".pm")))
+ SvMULTI_on(gv);
if (perldb)
hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
return gv;
if (SvLEN(gv))
Safefree(SvPVX(gv));
Newz(602,gp, 1, GP);
- GvGP(gv) = gp;
+ GvGP(gv) = gp_ref(gp);
GvREFCNT(gv) = 1;
GvSV(gv) = NEWSV(72,0);
GvLINE(gv) = curcop->cop_line;
+ GvFILEGV(gv) = curcop->cop_filegv;
GvEGV(gv) = gv;
sv_magic((SV*)gv, (SV*)gv, '*', name, len);
GvSTASH(gv) = stash;
- GvNAME(gv) = nsavestr(name, len);
+ GvNAME(gv) = savepvn(name, len);
GvNAMELEN(gv) = len;
if (multi)
SvMULTI_on(gv);
}
+static void
+gv_init_sv(gv, sv_type)
+GV* gv;
+I32 sv_type;
+{
+ switch (sv_type) {
+ case SVt_PVIO:
+ (void)GvIOn(gv);
+ break;
+ case SVt_PVAV:
+ (void)GvAVn(gv);
+ break;
+ case SVt_PVHV:
+ (void)GvHVn(gv);
+ break;
+ }
+}
+
GV *
-gv_fetchmeth(stash, name, len)
+gv_fetchmeth(stash, name, len, level)
HV* stash;
char* name;
STRLEN len;
+I32 level;
{
AV* av;
GV* topgv;
GV* gv;
GV** gvp;
+ HV* lastchance;
+ CV* cv;
+
+ if (!stash)
+ return 0;
+ if (level > 100)
+ croak("Recursive inheritance detected");
gvp = (GV**)hv_fetch(stash, name, len, TRUE);
if (SvTYPE(topgv) != SVt_PVGV)
gv_init(topgv, stash, name, len, TRUE);
- if (GvCV(topgv)) {
- if (!GvCVGEN(topgv) || GvCVGEN(topgv) >= sub_generation)
+ if (cv=GvCV(topgv)) {
+ if (GvCVGEN(topgv) >= sub_generation)
+ return topgv; /* valid cached inheritance */
+ if (!GvCVGEN(topgv)) { /* not an inheritance cache */
return topgv;
+ }
+ else {
+ /* stale cached entry, just junk it */
+ GvCV(topgv) = cv = 0;
+ GvCVGEN(topgv) = 0;
+ }
}
+ /* if cv is still set, we have to free it if we find something to cache */
gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
I32 items = AvFILL(av) + 1;
while (items--) {
SV* sv = *svp++;
- HV* basestash = fetch_stash(sv, FALSE);
+ HV* basestash = gv_stashsv(sv, FALSE);
if (!basestash) {
if (dowarn)
- warn("Can't locate package %s for @%s'ISA",
+ warn("Can't locate package %s for @%s::ISA",
SvPVX(sv), HvNAME(stash));
continue;
}
- gv = gv_fetchmeth(basestash, name, len);
+ gv = gv_fetchmeth(basestash, name, len, level + 1);
if (gv) {
+ if (cv) { /* junk old undef */
+ assert(SvREFCNT(topgv) > 1);
+ SvREFCNT_dec(topgv);
+ SvREFCNT_dec(cv);
+ }
+ GvCV(topgv) = GvCV(gv); /* cache the CV */
+ GvCVGEN(topgv) = sub_generation; /* valid for now */
+ return gv;
+ }
+ }
+ }
+
+ if (!level) {
+ if (lastchance = gv_stashpv("UNIVERSAL", FALSE)) {
+ if (gv = gv_fetchmeth(lastchance, name, len, level + 1)) {
+ if (cv) { /* junk old undef */
+ assert(SvREFCNT(topgv) > 1);
+ SvREFCNT_dec(topgv);
+ SvREFCNT_dec(cv);
+ }
GvCV(topgv) = GvCV(gv); /* cache the CV */
GvCVGEN(topgv) = sub_generation; /* valid for now */
return gv;
}
}
}
+
return 0;
}
char* name;
{
register char *nend;
+ char *nsplit = 0;
+ GV* gv;
for (nend = name; *nend; nend++) {
- if (*nend == ':' || *nend == '\'') {
- return gv_fetchpv(name, FALSE);
+ if (*nend == ':' || *nend == '\'')
+ nsplit = nend;
+ }
+ if (nsplit) {
+ char ch;
+ char *origname = name;
+ name = nsplit + 1;
+ ch = *nsplit;
+ if (*nsplit == ':')
+ --nsplit;
+ *nsplit = '\0';
+ if (strEQ(origname,"SUPER")) {
+ /* Degenerate case ->SUPER::method should really lookup in original stash */
+ SV *tmpstr = sv_2mortal(newSVpv(HvNAME(curcop->cop_stash),0));
+ sv_catpvn(tmpstr, "::SUPER", 7);
+ stash = gv_stashpv(SvPV(tmpstr,na),TRUE);
+ *nsplit = ch;
+ DEBUG_o( deb("Treating %s as %s::%s\n",origname,HvNAME(stash),name) );
+ } else {
+ stash = gv_stashpv(origname,TRUE);
+ *nsplit = ch;
+ }
+ }
+ gv = gv_fetchmeth(stash, name, nend - name, 0);
+
+ if (!gv) {
+ /* Failed obvious case - look for SUPER as last element of stash's name */
+ char *packname = HvNAME(stash);
+ STRLEN len = strlen(packname);
+ if (len >= 7 && strEQ(packname+len-7,"::SUPER")) {
+ /* Now look for @.*::SUPER::ISA */
+ GV** gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
+ if (!gvp || (gv = *gvp) == (GV*)&sv_undef || !GvAV(gv)) {
+ /* No @ISA in package ending in ::SUPER - drop suffix
+ and see if there is an @ISA there
+ */
+ HV *basestash;
+ char ch = packname[len-7];
+ AV *av;
+ packname[len-7] = '\0';
+ basestash = gv_stashpv(packname, TRUE);
+ packname[len-7] = ch;
+ gvp = (GV**)hv_fetch(basestash,"ISA",3,FALSE);
+ if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
+ /* Okay found @ISA after dropping the SUPER, alias it */
+ SV *tmpstr = sv_2mortal(newSVpv(HvNAME(stash),0));
+ sv_catpvn(tmpstr, "::ISA", 5);
+ gv = gv_fetchpv(SvPV(tmpstr,na),TRUE,SVt_PVGV);
+ if (gv) {
+ GvAV(gv) = (AV*)SvREFCNT_inc(av);
+ /* ... and re-try lookup */
+ gv = gv_fetchmeth(stash, name, nend - name, 0);
+ } else {
+ croak("Cannot create %s::ISA",HvNAME(stash));
+ }
+ }
+ }
+ }
+ }
+
+ if (!gv) {
+ CV* cv;
+
+ if (strEQ(name,"import") || strEQ(name,"unimport"))
+ gv = &sv_yes;
+ else if (strNE(name, "AUTOLOAD")) {
+ gv = gv_fetchmeth(stash, "AUTOLOAD", 8, 0);
+ if (gv && (cv = GvCV(gv))) { /* One more chance... */
+ SV *tmpstr = sv_2mortal(newSVpv(HvNAME(stash),0));
+ sv_catpvn(tmpstr,"::", 2);
+ sv_catpvn(tmpstr, name, nend - name);
+ sv_setsv(GvSV(CvGV(cv)), tmpstr);
+ }
}
}
- return gv_fetchmeth(stash, name, nend - name);
+ return gv;
+}
+
+HV*
+gv_stashpv(name,create)
+char *name;
+I32 create;
+{
+ char tmpbuf[1234];
+ HV *stash;
+ GV *tmpgv;
+ sprintf(tmpbuf,"%.*s::",1200,name);
+ tmpgv = gv_fetchpv(tmpbuf,create, SVt_PVHV);
+ if (!tmpgv)
+ return 0;
+ if (!GvHV(tmpgv))
+ GvHV(tmpgv) = newHV();
+ stash = GvHV(tmpgv);
+ if (!HvNAME(stash))
+ HvNAME(stash) = savepv(name);
+ return stash;
}
+HV*
+gv_stashsv(sv,create)
+SV *sv;
+I32 create;
+{
+ return gv_stashpv(SvPV(sv,na), create);
+}
+
+
GV *
-gv_fetchpv(nambeg,add)
+gv_fetchpv(nambeg,add,sv_type)
char *nambeg;
I32 add;
+I32 sv_type;
{
register char *name = nambeg;
register GV *gv = 0;
register char *namend;
HV *stash = 0;
bool global = FALSE;
- char tmpbuf[256];
+ char *tmpbuf;
for (namend = name; *namend; namend++) {
if ((*namend == '\'' && namend[1]) ||
(*namend == ':' && namend[1] == ':'))
{
- len = namend - name;
- *tmpbuf = '_';
- Copy(name, tmpbuf+1, len, char);
- len++;
- tmpbuf[len] = '\0';
if (!stash)
stash = defstash;
+ if (!SvREFCNT(stash)) /* symbol table under destruction */
+ return Nullgv;
- if (len > 1) {
+ len = namend - name;
+ if (len > 0) {
+ New(601, tmpbuf, len+3, char);
+ Copy(name, tmpbuf, len, char);
+ tmpbuf[len++] = ':';
+ tmpbuf[len++] = ':';
+ tmpbuf[len] = '\0';
gvp = (GV**)hv_fetch(stash,tmpbuf,len,add);
+ Safefree(tmpbuf);
if (!gvp || *gvp == (GV*)&sv_undef)
return Nullgv;
gv = *gvp;
+
if (SvTYPE(gv) == SVt_PVGV)
SvMULTI_on(gv);
+ else if (!add)
+ return Nullgv;
else
gv_init(gv, stash, nambeg, namend - nambeg, (add & 2));
+
if (!(stash = GvHV(gv)))
stash = GvHV(gv) = newHV();
+
if (!HvNAME(stash))
- HvNAME(stash) = nsavestr(nambeg, namend - nambeg);
+ HvNAME(stash) = savepvn(nambeg, namend - nambeg);
}
if (*namend == ':')
namend++;
name = namend;
if (!*name)
- return gv ? gv : defgv;
+ return gv ? gv : *hv_fetch(defstash, "main::", 6, TRUE);
}
}
+ len = namend - name;
+ if (!len)
+ len = 1;
/* No stash in name, so see how we can default */
global = TRUE;
if (global)
stash = defstash;
- else if ((COP*)curcop == &compiling)
+ else if ((COP*)curcop == &compiling) {
stash = curstash;
+ if (add && (hints & HINT_STRICT_VARS) &&
+ sv_type != SVt_PVCV &&
+ sv_type != SVt_PVGV &&
+ sv_type != SVt_PVFM &&
+ sv_type != SVt_PVIO)
+ {
+ gvp = (GV**)hv_fetch(stash,name,len,0);
+ if (!gvp ||
+ *gvp == (GV*)&sv_undef ||
+ SvTYPE(*gvp) != SVt_PVGV ||
+ !(GvFLAGS(*gvp) & GVf_IMPORTED))
+ stash = 0;
+ else if (sv_type == SVt_PVAV && !GvAV(*gvp) ||
+ sv_type == SVt_PVHV && !GvHV(*gvp) ||
+ sv_type == SVt_PV &&
+ (!GvSV(*gvp) ||
+ (!SvTYPE(GvSV(*gvp)) &&
+ SvREFCNT(GvSV(*gvp)) == 1) ))
+ {
+ warn("Variable \"%c%s\" is not exported",
+ sv_type == SVt_PVAV ? '@' :
+ sv_type == SVt_PVHV ? '%' : '$',
+ name);
+ if (GvCV(*gvp))
+ warn("(Did you mean &%s instead?)\n", name);
+ stash = 0;
+ }
+ }
+ }
else
stash = curcop->cop_stash;
}
/* By this point we should have a stash and a name */
- if (!stash)
- croak("Global symbol \"%s\" requires explicit package name", name);
- len = namend - name;
- if (!len)
- len = 1;
+ if (!stash) {
+ if (add) {
+ warn("Global symbol \"%s\" requires explicit package name", name);
+ ++error_count;
+ stash = curstash ? curstash : defstash; /* avoid core dumps */
+ }
+ else
+ return Nullgv;
+ }
+
+ if (!SvREFCNT(stash)) /* symbol table under destruction */
+ return Nullgv;
+
gvp = (GV**)hv_fetch(stash,name,len,add);
if (!gvp || *gvp == (GV*)&sv_undef)
return Nullgv;
gv = *gvp;
if (SvTYPE(gv) == SVt_PVGV) {
- SvMULTI_on(gv);
+ if (add) {
+ SvMULTI_on(gv);
+ gv_init_sv(gv, sv_type);
+ }
return gv;
}
/* Adding a new symbol */
+ if (add & 4)
+ warn("Had to create %s unexpectedly", nambeg);
gv_init(gv, stash, name, len, add & 2);
+ gv_init_sv(gv, sv_type);
/* set up magic where warranted */
switch (*name) {
+ case 'A':
+ if (strEQ(name, "ARGV")) {
+ IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
+ }
+ break;
+
case 'a':
case 'b':
if (len == 1)
SvMULTI_on(gv);
break;
+ case 'E':
+ if (strnEQ(name, "EXPORT", 6))
+ SvMULTI_on(gv);
+ break;
case 'I':
if (strEQ(name, "ISA")) {
AV* av = GvAVn(gv);
- sv_magic((SV*)av, (SV*)gv, 'I', 0, 0);
+ SvMULTI_on(gv);
+ sv_magic((SV*)av, (SV*)gv, 'I', Nullch, 0);
+ if (add & 2 && strEQ(nambeg,"AnyDBM_File::ISA") && AvFILL(av) == -1)
+ {
+ char *pname;
+ av_push(av, newSVpv(pname = "NDBM_File",0));
+ gv_stashpv(pname, TRUE);
+ av_push(av, newSVpv(pname = "DB_File",0));
+ gv_stashpv(pname, TRUE);
+ av_push(av, newSVpv(pname = "GDBM_File",0));
+ gv_stashpv(pname, TRUE);
+ av_push(av, newSVpv(pname = "SDBM_File",0));
+ gv_stashpv(pname, TRUE);
+ av_push(av, newSVpv(pname = "ODBM_File",0));
+ gv_stashpv(pname, TRUE);
+ }
}
break;
+#ifdef OVERLOAD
+ case 'O':
+ if (strEQ(name, "OVERLOAD")) {
+ HV* hv = GvHVn(gv);
+ SvMULTI_on(gv);
+ sv_magic((SV*)hv, (SV*)gv, 'A', 0, 0);
+ }
+ break;
+#endif /* OVERLOAD */
case 'S':
if (strEQ(name, "SIG")) {
HV *hv;
/* initialize signal stack */
signalstack = newAV();
- av_store(signalstack, 32, Nullsv);
- av_clear(signalstack);
AvREAL_off(signalstack);
+ av_extend(signalstack, 30);
+ av_fill(signalstack, 0);
}
break;
break;
ampergv = gv;
sawampersand = TRUE;
- goto magicalize;
+ goto ro_magicalize;
case '`':
if (len > 1)
break;
leftgv = gv;
sawampersand = TRUE;
- goto magicalize;
+ goto ro_magicalize;
case '\'':
if (len > 1)
break;
rightgv = gv;
sawampersand = TRUE;
- goto magicalize;
+ goto ro_magicalize;
case ':':
if (len > 1)
sv_setpv(GvSV(gv),chopset);
goto magicalize;
- case '!':
case '#':
+ case '*':
+ if (dowarn && len == 1 && sv_type == SVt_PV)
+ warn("Use of $%s is deprecated", name);
+ /* FALL THROUGH */
+ case '[':
+ case '!':
case '?':
case '^':
case '~':
case '-':
case '%':
case '.':
- case '+':
- case '*':
case '(':
case ')':
case '<':
case ',':
case '\\':
case '/':
- case '[':
case '|':
+ case '\001':
case '\004':
+ case '\006':
+ case '\010':
case '\t':
case '\020':
case '\024':
case '\027':
- case '\006':
if (len > 1)
break;
goto magicalize;
+ case '+':
case '1':
case '2':
case '3':
case '7':
case '8':
case '9':
+ ro_magicalize:
+ SvREADONLY_on(GvSV(gv));
magicalize:
sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
break;
SV *sv;
sv = GvSV(gv);
sv_upgrade(sv, SVt_PVNV);
- sv_setpv(sv,rcsid);
- SvNVX(sv) = atof(patchlevel);
- SvNOK_on(sv);
+ sv_setpv(sv, patchlevel);
}
break;
}
GV *gv;
{
GV* egv = GvEGV(gv);
- HV *hv = GvSTASH(egv);
-
+ HV *hv;
+
+ if (!egv)
+ egv = gv;
+ hv = GvSTASH(egv);
if (!hv)
return;
+
sv_setpv(sv, sv == (SV*)gv ? "*" : "");
sv_catpv(sv,HvNAME(hv));
sv_catpvn(sv,"::", 2);
newIO()
{
IO *io;
+ GV *iogv;
- Newz(603,io,1,IO);
- io->page_len = 60;
+ io = (IO*)NEWSV(0,0);
+ sv_upgrade((SV *)io,SVt_PVIO);
+ SvREFCNT(io) = 1;
+ SvOBJECT_on(io);
+ iogv = gv_fetchpv("FileHandle::", TRUE, SVt_PVIO);
+ SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
return io;
}
register I32 i;
register GV *gv;
HV *hv;
+ GV *filegv;
- for (i = 0; i <= HvMAX(stash); i++) {
+ if (!HvARRAY(stash))
+ return;
+ for (i = 0; i <= (I32) HvMAX(stash); i++) {
for (entry = HvARRAY(stash)[i]; entry; entry = entry->hent_next) {
- if (isALPHA(*entry->hent_key)) {
+ if (entry->hent_key[entry->hent_klen-1] == ':' &&
+ (gv = (GV*)entry->hent_val) && (hv = GvHV(gv)) && HvNAME(hv))
+ {
+ if (hv != defstash)
+ gv_check(hv); /* nested package */
+ }
+ else if (isALPHA(*entry->hent_key)) {
gv = (GV*)entry->hent_val;
if (SvMULTI(gv))
continue;
curcop->cop_line = GvLINE(gv);
- warn("Possible typo: \"%s::%s\"", HvNAME(stash), GvNAME(gv));
+ filegv = GvFILEGV(gv);
+ curcop->cop_filegv = filegv;
+ if (filegv && SvMULTI(filegv)) /* Filename began with slash */
+ continue;
+ warn("Identifier \"%s::%s\" used only once: possible typo",
+ HvNAME(stash), GvNAME(gv));
}
- else if (*entry->hent_key == '_' &&
- (gv = (GV*)entry->hent_val) &&
- (hv = GvHV(gv)) && HvNAME(hv) && hv != defstash)
- gv_check(hv); /* nested package */
-
}
}
}
GV *
-newGVgen()
+newGVgen(pack)
+char *pack;
{
- (void)sprintf(tokenbuf,"_GEN_%d",gensym++);
- return gv_fetchpv(tokenbuf,TRUE);
+ (void)sprintf(tokenbuf,"%s::_GEN_%ld",pack,(long)gensym++);
+ return gv_fetchpv(tokenbuf,TRUE, SVt_PVGV);
}
/* hopefully this is only called on local symbol table entries */
warn("Attempt to free unreferenced glob pointers");
return;
}
- if (--gp->gp_refcnt > 0)
+ if (--gp->gp_refcnt > 0) {
+ if (gp->gp_egv == gv)
+ gp->gp_egv = 0;
return;
+ }
- sv_free((SV*)gp->gp_sv);
- sv_free((SV*)gp->gp_av);
- sv_free((SV*)gp->gp_hv);
- if (io = gp->gp_io) {
+ SvREFCNT_dec(gp->gp_sv);
+ SvREFCNT_dec(gp->gp_av);
+ SvREFCNT_dec(gp->gp_hv);
+ if ((io = gp->gp_io) && SvTYPE(io) != SVTYPEMASK) {
do_close(gv,FALSE);
- Safefree(io->top_name);
- Safefree(io->fmt_name);
- Safefree(io);
+ SvREFCNT_dec(io);
}
- if (cv = gp->gp_cv)
- sv_free((SV*)cv);
+ if ((cv = gp->gp_cv) && !GvCVGEN(gv))
+ SvREFCNT_dec(cv);
+ SvREFCNT_dec(gp->gp_form);
+
Safefree(gp);
GvGP(gv) = 0;
}
}
#endif /* Microport 2.4 hack */
-GV *
-fetch_gv(op,num)
-OP *op;
-I32 num;
+#ifdef OVERLOAD
+/* Updates and caches the CV's */
+
+bool
+Gv_AMupdate(stash)
+HV* stash;
{
- if (op->op_private < num)
- return 0;
- if (op->op_flags & OPf_STACKED)
- return gv_fetchpv(SvPVx(*(stack_sp--), na),TRUE);
- else
- return cGVOP->op_gv;
+ GV** gvp;
+ HV* hv;
+ GV* gv;
+ CV* cv;
+ MAGIC* mg=mg_find((SV*)stash,'c');
+ AMT *amtp=mg ? (AMT*)mg->mg_ptr: NULL;
+
+ if (mg && (amtp=((AMT*)(mg->mg_ptr)))->was_ok_am == amagic_generation &&
+ amtp->was_ok_sub == sub_generation)
+ return HV_AMAGIC(stash)? TRUE: FALSE;
+ gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE);
+ if (amtp && amtp->table) {
+ int i;
+ for (i=1;i<NofAMmeth*2;i++) {
+ if (amtp->table[i]) {
+ SvREFCNT_dec(amtp->table[i]);
+ }
+ }
+ }
+ sv_unmagic((SV*)stash, 'c');
+
+ DEBUG_o( deb("Recalcing overload magic in package %s\n",HvNAME(stash)) );
+
+ if (gvp && ((gv = *gvp) != (GV*)&sv_undef && (hv = GvHV(gv)))) {
+ int filled=0;
+ int i;
+ char *cp;
+ AMT amt;
+ SV* sv;
+ SV** svp;
+
+/* if (*(svp)==(SV*)amagic_generation && *(svp+1)==(SV*)sub_generation) {
+ DEBUG_o( deb("Overload magic in package %s up-to-date\n",HvNAME(stash))
+);
+ return HV_AMAGIC(stash)? TRUE: FALSE;
+ }*/
+
+ amt.was_ok_am=amagic_generation;
+ amt.was_ok_sub=sub_generation;
+ amt.fallback=AMGfallNO;
+
+ /* Work with "fallback" key, which we assume to be first in AMG_names */
+
+ if ((cp=((char**)(*AMG_names))[0]) &&
+ (svp=(SV**)hv_fetch(hv,cp,strlen(cp),FALSE)) && (sv = *svp)) {
+ if (SvTRUE(sv)) amt.fallback=AMGfallYES;
+ else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
+ }
+
+ for (i=1;i<NofAMmeth*2;i++) {
+ cv=0;
+
+ if ( (cp=((char**)(*AMG_names))[i]) ) {
+ svp=(SV**)hv_fetch(hv,cp,strlen(cp),FALSE);
+ if (svp && ((sv = *svp) != (GV*)&sv_undef)) {
+ switch (SvTYPE(sv)) {
+ default:
+ if (!SvROK(sv)) {
+ if (!SvOK(sv)) break;
+ gv = gv_fetchmethod(stash, SvPV(sv, na));
+ if (gv) cv = GvCV(gv);
+ break;
+ }
+ cv = (CV*)SvRV(sv);
+ if (SvTYPE(cv) == SVt_PVCV)
+ break;
+ /* FALL THROUGH */
+ case SVt_PVHV:
+ case SVt_PVAV:
+ die("Not a subroutine reference in %%OVERLOAD");
+ return FALSE;
+ case SVt_PVCV:
+ cv = (CV*)sv;
+ break;
+ case SVt_PVGV:
+ if (!(cv = GvCV((GV*)sv)))
+ cv = sv_2cv(sv, &stash, &gv, TRUE);
+ break;
+ }
+ if (cv) filled=1;
+ else {
+ die("Method for operation %s not found in package %.200s during blessing\n",
+ cp,HvNAME(stash));
+ return FALSE;
+ }
+ }
+ }
+ amt.table[i]=(CV*)SvREFCNT_inc(cv);
+ }
+ sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(amt));
+ if (filled) {
+/* HV_badAMAGIC_off(stash);*/
+ HV_AMAGIC_on(stash);
+ return TRUE;
+ }
+ }
+/*HV_badAMAGIC_off(stash);*/
+ HV_AMAGIC_off(stash);
+ return FALSE;
}
-IO *
-fetch_io(op,num)
-OP *op;
-I32 num;
+/* During call to this subroutine stack can be reallocated. It is
+ * advised to call SPAGAIN macro in your code after call */
+
+SV*
+amagic_call(left,right,method,flags)
+SV* left;
+SV* right;
+int method;
+int flags;
{
- GV *gv;
+ MAGIC *mg;
+ CV *cv;
+ CV **cvp=NULL, **ocvp=NULL;
+ AMT *amtp, *oamtp;
+ int fl=0, off, off1, lr=0, assign=AMGf_assign & flags, notfound=0;
+ int postpr=0, inc_dec_ass=0, assignshift=assign?1:0;
+ HV* stash;
+ if (!(AMGf_noleft & flags) && SvAMAGIC(left)
+ && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
+ && (ocvp = cvp = ((oamtp=amtp=(AMT*)mg->mg_ptr)->table))
+ && ((cv = cvp[off=method+assignshift])
+ || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
+ * usual method */
+ (fl = 1, cv = cvp[off=method])))) {
+ lr = -1; /* Call method for left argument */
+ } else {
+ if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
+ int logic;
- if (op->op_private < num)
- return 0;
- if (op->op_flags & OPf_STACKED)
- gv = gv_fetchpv(SvPVx(*(stack_sp--), na),TRUE);
- else
- gv = cGVOP->op_gv;
+ /* look for substituted methods */
+ switch (method) {
+ case inc_amg:
+ if (((cv = cvp[off=add_ass_amg]) && (inc_dec_ass=1))
+ || ((cv = cvp[off=add_amg]) && (postpr=1))) {
+ right = &sv_yes; lr = -1; assign = 1;
+ }
+ break;
+ case dec_amg:
+ if (((cv = cvp[off=subtr_ass_amg]) && (inc_dec_ass=1))
+ || ((cv = cvp[off=subtr_amg]) && (postpr=1))) {
+ right = &sv_yes; lr = -1; assign = 1;
+ }
+ break;
+ case bool__amg:
+ (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
+ break;
+ case numer_amg:
+ (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
+ break;
+ case string_amg:
+ (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
+ break;
+ case copy_amg:
+ {
+ SV* ref=SvRV(left);
+ if (!SvROK(ref) && SvTYPE(ref) <= SVt_PVMG) { /* Just to be
+ * extra
+ * causious,
+ * maybe in some
+ * additional
+ * cases sv_setsv
+ * is safe too */
+ SV* newref = newSVsv(ref);
+ SvOBJECT_on(newref);
+ SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(ref));
+ return newref;
+ }
+ }
+ break;
+ case abs_amg:
+ if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
+ && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
+ SV* nullsv=sv_2mortal(newSViv(0));
+ if (off1==lt_amg) {
+ SV* lessp = amagic_call(left,nullsv,
+ lt_amg,AMGf_noright);
+ logic = SvTRUE(lessp);
+ } else {
+ SV* lessp = amagic_call(left,nullsv,
+ ncmp_amg,AMGf_noright);
+ logic = (SvNV(lessp) < 0);
+ }
+ if (logic) {
+ if (off==subtr_amg) {
+ right = left;
+ left = nullsv;
+ lr = 1;
+ }
+ } else {
+ return left;
+ }
+ }
+ break;
+ case neg_amg:
+ if (cv = cvp[off=subtr_amg]) {
+ right = left;
+ left = sv_2mortal(newSViv(0));
+ lr = 1;
+ }
+ break;
+ default:
+ goto not_found;
+ }
+ if (!cv) goto not_found;
+ } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
+ && (mg = mg_find((SV*)(stash=SvSTASH(SvRV(right))),'c'))
+ && (cvp = ((amtp=(AMT*)mg->mg_ptr)->table))
+ && (cv = cvp[off=method])) { /* Method for right
+ * argument found */
+ lr=1;
+ } else if (((ocvp && oamtp->fallback > AMGfallNEVER
+ && (cvp=ocvp) && (lr = -1))
+ || (cvp && amtp->fallback > AMGfallNEVER && (lr=1)))
+ && !(flags & AMGf_unary)) {
+ /* We look for substitution for
+ * comparison operations and
+ * concatendation */
+ if (method==concat_amg || method==concat_ass_amg
+ || method==repeat_amg || method==repeat_ass_amg) {
+ return NULL; /* Delegate operation to string conversion */
+ }
+ off = -1;
+ switch (method) {
+ case lt_amg:
+ case le_amg:
+ case gt_amg:
+ case ge_amg:
+ case eq_amg:
+ case ne_amg:
+ postpr = 1; off=ncmp_amg; break;
+ case slt_amg:
+ case sle_amg:
+ case sgt_amg:
+ case sge_amg:
+ case seq_amg:
+ case sne_amg:
+ postpr = 1; off=scmp_amg; break;
+ }
+ if (off != -1) cv = cvp[off];
+ if (!cv) {
+ goto not_found;
+ }
+ } else {
+ not_found: /* No method found, either report or die */
+ if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
+ notfound = 1; lr = -1;
+ } else if (cvp && (cv=cvp[nomethod_amg])) {
+ notfound = 1; lr = 1;
+ } else {
+ char tmpstr[512];
+ if (off==-1) off=method;
+ sprintf(tmpstr,"Operation `%s': no method found,\n\tleft argument %s%.200s,\n\tright argument %s%.200s",
+ ((char**)AMG_names)[off],
+ SvAMAGIC(left)?
+ "in overloaded package ":
+ "has no overloaded magic",
+ SvAMAGIC(left)?
+ HvNAME(SvSTASH(SvRV(left))):
+ "",
+ SvAMAGIC(right)?
+ "in overloaded package ":
+ "has no overloaded magic",
+ SvAMAGIC(right)?
+ HvNAME(SvSTASH(SvRV(right))):
+ "");
+ if (amtp && amtp->fallback >= AMGfallYES) {
+ DEBUG_o( deb(tmpstr) );
+ } else {
+ die(tmpstr);
+ }
+ return NULL;
+ }
+ }
+ }
+ if (!notfound) {
+ DEBUG_o( deb("Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %.200s%s\n",
+ ((char**)AMG_names)[off],
+ method+assignshift==off? "" :
+ " (initially `",
+ method+assignshift==off? "" :
+ ((char**)AMG_names)[method+assignshift],
+ method+assignshift==off? "" : "')",
+ flags & AMGf_unary? "" :
+ lr==1 ? " for right argument": " for left argument",
+ flags & AMGf_unary? " for argument" : "",
+ HvNAME(stash),
+ fl? ",\n\tassignment variant used": "") );
+ /* Since we use shallow copy during assignment, we need
+ * to dublicate the contents, probably calling user-supplied
+ * version of copy operator
+ */
+ if ((method+assignshift==off
+ && (assign || method==inc_amg || method==dec_amg))
+ || inc_dec_ass) RvDEEPCP(left);
+ }
+ {
+ dSP;
+ BINOP myop;
+ SV* res;
- if (!gv)
- return 0;
+ Zero(&myop, 1, BINOP);
+ myop.op_last = (OP *) &myop;
+ myop.op_next = Nullop;
+ myop.op_flags = OPf_KNOW|OPf_STACKED;
+
+ ENTER;
+ SAVESPTR(op);
+ op = (OP *) &myop;
+ PUTBACK;
+ pp_pushmark();
+
+ EXTEND(sp, notfound + 5);
+ PUSHs(lr>0? right: left);
+ PUSHs(lr>0? left: right);
+ PUSHs( assign ? &sv_undef : (lr>0? &sv_yes: &sv_no));
+ if (notfound) {
+ PUSHs( sv_2mortal(newSVpv(((char**)AMG_names)[off],0)) );
+ }
+ PUSHs((SV*)cv);
+ PUTBACK;
+
+ if (op = pp_entersub())
+ run();
+ LEAVE;
+ SPAGAIN;
- return GvIOn(gv);
+ res=POPs;
+ PUTBACK;
+
+ if (notfound) {
+ /* sv_2mortal(res); */
+ return NULL;
+ }
+
+ if (postpr) {
+ int ans;
+ switch (method) {
+ case le_amg:
+ case sle_amg:
+ ans=SvIV(res)<=0; break;
+ case lt_amg:
+ case slt_amg:
+ ans=SvIV(res)<0; break;
+ case ge_amg:
+ case sge_amg:
+ ans=SvIV(res)>=0; break;
+ case gt_amg:
+ case sgt_amg:
+ ans=SvIV(res)>0; break;
+ case eq_amg:
+ case seq_amg:
+ ans=SvIV(res)==0; break;
+ case ne_amg:
+ case sne_amg:
+ ans=SvIV(res)!=0; break;
+ case inc_amg:
+ case dec_amg:
+ SvSetSV(left,res); return res; break;
+ }
+ return ans? &sv_yes: &sv_no;
+ } else if (method==copy_amg) {
+ if (!SvROK(res)) {
+ die("Copy method did not return a reference");
+ }
+ return SvREFCNT_inc(SvRV(res));
+ } else {
+ return res;
+ }
+ }
}
+#endif /* OVERLOAD */
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