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gv.c
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C/C++ Source or Header
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1996-03-25
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27KB
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1,198 lines
/* gv.c
*
* 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.
*
*/
/*
* '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"
#include "perl.h"
extern char rcsid[];
GV *
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 *
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, SVt_PVGV);
sv_setpv(GvSV(gv), name);
if (*name == '/' && (instr(name,"/lib/") || instr(name,".pm")))
GvMULTI_on(gv);
if (perldb)
hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
return gv;
}
void
gv_init(gv, stash, name, len, multi)
GV *gv;
HV *stash;
char *name;
STRLEN len;
int multi;
{
register GP *gp;
sv_upgrade(gv, SVt_PVGV);
if (SvLEN(gv))
Safefree(SvPVX(gv));
Newz(602,gp, 1, 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) = savepvn(name, len);
GvNAMELEN(gv) = len;
if (multi)
GvMULTI_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, 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);
DEBUG_o( deb("Looking for method %s in package %s\n",name,HvNAME(stash)) );
topgv = *gvp;
if (SvTYPE(topgv) != SVt_PVGV)
gv_init(topgv, stash, name, len, TRUE);
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))) {
SV** svp = AvARRAY(av);
I32 items = AvFILL(av) + 1;
while (items--) {
SV* sv = *svp++;
HV* basestash = gv_stashsv(sv, FALSE);
if (!basestash) {
if (dowarn)
warn("Can't locate package %s for @%s::ISA",
SvPVX(sv), HvNAME(stash));
continue;
}
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;
}
GV *
gv_fetchmethod(stash, name)
HV* stash;
char* name;
{
register char *nend;
char *nsplit = 0;
GV* gv;
for (nend = name; *nend; nend++) {
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);
if (tainting)
sv_unmagic(GvSV(CvGV(cv)), 't');
}
}
}
return gv;
}
HV*
gv_stashpv(name,create)
char *name;
I32 create;
{
char tmpbuf[1234];
HV *stash;
GV *tmpgv;
/* Use strncpy to avoid bug in VMS sprintf */
/* sprintf(tmpbuf,"%.*s::",1200,name); */
strncpy(tmpbuf, name, 1200);
tmpbuf[1200] = '\0'; /* just in case . . . */
strcat(tmpbuf, "::");
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,sv_type)
char *nambeg;
I32 add;
I32 sv_type;
{
register char *name = nambeg;
register GV *gv = 0;
GV**gvp;
I32 len;
register char *namend;
HV *stash = 0;
bool global = FALSE;
char *tmpbuf;
if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
name++;
for (namend = name; *namend; namend++) {
if ((*namend == '\'' && namend[1]) ||
(*namend == ':' && namend[1] == ':'))
{
if (!stash)
stash = defstash;
if (!SvREFCNT(stash)) /* symbol table under destruction */
return Nullgv;
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)
GvMULTI_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) = savepvn(nambeg, namend - nambeg);
}
if (*namend == ':')
namend++;
namend++;
name = namend;
if (!*name)
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 */
if (!stash) {
if (isIDFIRST(*name)) {
if (isUPPER(*name)) {
if (*name > 'I') {
if (*name == 'S' && (
strEQ(name, "SIG") ||
strEQ(name, "STDIN") ||
strEQ(name, "STDOUT") ||
strEQ(name, "STDERR") ))
global = TRUE;
}
else if (*name > 'E') {
if (*name == 'I' && strEQ(name, "INC"))
global = TRUE;
}
else if (*name > 'A') {
if (*name == 'E' && strEQ(name, "ENV"))
global = TRUE;
}
else if (*name == 'A' && (
strEQ(name, "ARGV") ||
strEQ(name, "ARGVOUT") ))
global = TRUE;
}
else if (*name == '_' && !name[1])
global = TRUE;
if (global)
stash = defstash;
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 &&
!(len == 1 && sv_type == SVt_PV && strchr("ab",*name)) )
{
gvp = (GV**)hv_fetch(stash,name,len,0);
if (!gvp ||
*gvp == (GV*)&sv_undef ||
SvTYPE(*gvp) != SVt_PVGV)
{
stash = 0;
}
else if (sv_type == SVt_PV && !GvIMPORTED_SV(*gvp) ||
sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp) ||
sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp) )
{
warn("Variable \"%c%s\" is not imported",
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;
}
else
stash = defstash;
}
/* By this point we should have a stash and a name */
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) {
if (add) {
GvMULTI_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)
GvMULTI_on(gv);
break;
case 'E':
if (strnEQ(name, "EXPORT", 6))
GvMULTI_on(gv);
break;
case 'I':
if (strEQ(name, "ISA")) {
AV* av = GvAVn(gv);
GvMULTI_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);
GvMULTI_on(gv);
sv_magic((SV*)hv, (SV*)gv, 'A', 0, 0);
}
break;
#endif /* OVERLOAD */
case 'S':
if (strEQ(name, "SIG")) {
HV *hv;
siggv = gv;
GvMULTI_on(siggv);
hv = GvHVn(siggv);
hv_magic(hv, siggv, 'S');
/* initialize signal stack */
signalstack = newAV();
AvREAL_off(signalstack);
av_extend(signalstack, 30);
av_fill(signalstack, 0);
}
break;
case '&':
if (len > 1)
break;
ampergv = gv;
sawampersand = TRUE;
goto ro_magicalize;
case '`':
if (len > 1)
break;
leftgv = gv;
sawampersand = TRUE;
goto ro_magicalize;
case '\'':
if (len > 1)
break;
rightgv = gv;
sawampersand = TRUE;
goto ro_magicalize;
case ':':
if (len > 1)
break;
sv_setpv(GvSV(gv),chopset);
goto magicalize;
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 '\001':
case '\004':
case '\005':
case '\006':
case '\010':
case '\017':
case '\t':
case '\020':
case '\024':
case '\027':
if (len > 1)
break;
goto magicalize;
case '+':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
ro_magicalize:
SvREADONLY_on(GvSV(gv));
magicalize:
sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
break;
case '\014':
if (len > 1)
break;
sv_setpv(GvSV(gv),"\f");
formfeed = GvSV(gv);
break;
case ';':
if (len > 1)
break;
sv_setpv(GvSV(gv),"\034");
break;
case ']':
if (len == 1) {
SV *sv;
sv = GvSV(gv);
sv_upgrade(sv, SVt_PVNV);
sv_setpv(sv, patchlevel);
}
break;
}
return gv;
}
void
gv_fullname(sv,gv)
SV *sv;
GV *gv;
{
HV *hv = GvSTASH(gv);
if (!hv)
return;
sv_setpv(sv, sv == (SV*)gv ? "*" : "");
sv_catpv(sv,HvNAME(hv));
sv_catpvn(sv,"::", 2);
sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
}
void
gv_efullname(sv,gv)
SV *sv;
GV *gv;
{
GV* egv = GvEGV(gv);
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);
sv_catpvn(sv,GvNAME(egv),GvNAMELEN(egv));
}
IO *
newIO()
{
IO *io;
GV *iogv;
io = (IO*)NEWSV(0,0);
sv_upgrade((SV *)io,SVt_PVIO);
SvREFCNT(io) = 1;
SvOBJECT_on(io);
iogv = gv_fetchpv("FileHandle::", TRUE, SVt_PVHV);
SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
return io;
}
void
gv_check(stash)
HV* stash;
{
register HE *entry;
register I32 i;
register GV *gv;
HV *hv;
GV *filegv;
if (!HvARRAY(stash))
return;
for (i = 0; i <= (I32) HvMAX(stash); i++) {
for (entry = HvARRAY(stash)[i]; entry; entry = entry->hent_next) {
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 (GvMULTI(gv))
continue;
curcop->cop_line = GvLINE(gv);
filegv = GvFILEGV(gv);
curcop->cop_filegv = filegv;
if (filegv && GvMULTI(filegv)) /* Filename began with slash */
continue;
warn("Identifier \"%s::%s\" used only once: possible typo",
HvNAME(stash), GvNAME(gv));
}
}
}
}
GV *
newGVgen(pack)
char *pack;
{
(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 */
GP*
gp_ref(gp)
GP* gp;
{
gp->gp_refcnt++;
return gp;
}
void
gp_free(gv)
GV* gv;
{
GP* gp;
CV* cv;
if (!gv || !(gp = GvGP(gv)))
return;
if (gp->gp_refcnt == 0) {
warn("Attempt to free unreferenced glob pointers");
return;
}
if (--gp->gp_refcnt > 0) {
if (gp->gp_egv == gv)
gp->gp_egv = 0;
return;
}
SvREFCNT_dec(gp->gp_sv);
SvREFCNT_dec(gp->gp_av);
SvREFCNT_dec(gp->gp_hv);
SvREFCNT_dec(gp->gp_io);
if ((cv = gp->gp_cv) && !GvCVGEN(gv))
SvREFCNT_dec(cv);
SvREFCNT_dec(gp->gp_form);
Safefree(gp);
GvGP(gv) = 0;
}
#if defined(CRIPPLED_CC) && (defined(iAPX286) || defined(M_I286) || defined(I80286))
#define MICROPORT
#endif
#ifdef MICROPORT /* Microport 2.4 hack */
AV *GvAVn(gv)
register GV *gv;
{
if (GvGP(gv)->gp_av)
return GvGP(gv)->gp_av;
else
return GvGP(gv_AVadd(gv))->gp_av;
}
HV *GvHVn(gv)
register GV *gv;
{
if (GvGP(gv)->gp_hv)
return GvGP(gv)->gp_hv;
else
return GvGP(gv_HVadd(gv))->gp_hv;
}
#endif /* Microport 2.4 hack */
#ifdef OVERLOAD
/* Updates and caches the CV's */
bool
Gv_AMupdate(stash)
HV* stash;
{
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 %.256s 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;
}
/* 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;
{
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;
/* 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 {
if (off==-1) off=method;
sprintf(buf, "Operation `%s': no method found,\n\tleft argument %s%.256s,\n\tright argument %s%.256s",
((char**)AMG_names)[method + assignshift],
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(buf) );
} else {
die(buf);
}
return NULL;
}
}
}
if (!notfound) {
DEBUG_o( deb("Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %.256s%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;
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)[method + assignshift],0)) );
}
PUSHs((SV*)cv);
PUTBACK;
if (op = pp_entersub())
runops();
LEAVE;
SPAGAIN;
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 */