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freebsd-src/contrib/perl5/gv.c

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/* gv.c
*
* Copyright (c) 1991-1999, 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"
GV *
gv_AVadd(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(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(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(char *name)
{
dTHR;
char smallbuf[256];
char *tmpbuf;
STRLEN tmplen;
GV *gv;
tmplen = strlen(name) + 2;
if (tmplen < sizeof smallbuf)
tmpbuf = smallbuf;
else
New(603, tmpbuf, tmplen + 1, char);
tmpbuf[0] = '_';
tmpbuf[1] = '<';
strcpy(tmpbuf + 2, name);
gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
if (!isGV(gv))
gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
if (tmpbuf != smallbuf)
Safefree(tmpbuf);
sv_setpv(GvSV(gv), name);
if (*name == '/' && (instr(name, "/lib/") || instr(name, ".pm")))
GvMULTI_on(gv);
if (PERLDB_LINE)
hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
return gv;
}
void
gv_init(GV *gv, HV *stash, char *name, STRLEN len, int multi)
{
dTHR;
register GP *gp;
bool doproto = SvTYPE(gv) > SVt_NULL;
char *proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
sv_upgrade((SV*)gv, SVt_PVGV);
if (SvLEN(gv)) {
if (proto) {
SvPVX(gv) = NULL;
SvLEN(gv) = 0;
SvPOK_off(gv);
} else
Safefree(SvPVX(gv));
}
Newz(602, gp, 1, GP);
GvGP(gv) = gp_ref(gp);
GvSV(gv) = NEWSV(72,0);
GvLINE(gv) = PL_curcop->cop_line;
GvFILEGV(gv) = PL_curcop->cop_filegv;
GvCVGEN(gv) = 0;
GvEGV(gv) = gv;
sv_magic((SV*)gv, (SV*)gv, '*', name, len);
GvSTASH(gv) = (HV*)SvREFCNT_inc(stash);
GvNAME(gv) = savepvn(name, len);
GvNAMELEN(gv) = len;
if (multi || doproto) /* doproto means it _was_ mentioned */
GvMULTI_on(gv);
if (doproto) { /* Replicate part of newSUB here. */
SvIOK_off(gv);
ENTER;
/* XXX unsafe for threads if eval_owner isn't held */
start_subparse(0,0); /* Create CV in compcv. */
GvCV(gv) = PL_compcv;
LEAVE;
PL_sub_generation++;
CvGV(GvCV(gv)) = (GV*)SvREFCNT_inc(gv);
CvFILEGV(GvCV(gv)) = PL_curcop->cop_filegv;
CvSTASH(GvCV(gv)) = PL_curstash;
#ifdef USE_THREADS
CvOWNER(GvCV(gv)) = 0;
if (!CvMUTEXP(GvCV(gv))) {
New(666, CvMUTEXP(GvCV(gv)), 1, perl_mutex);
MUTEX_INIT(CvMUTEXP(GvCV(gv)));
}
#endif /* USE_THREADS */
if (proto) {
sv_setpv((SV*)GvCV(gv), proto);
Safefree(proto);
}
}
}
STATIC void
gv_init_sv(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(HV *stash, char *name, STRLEN len, I32 level)
{
AV* av;
GV* topgv;
GV* gv;
GV** gvp;
CV* cv;
if (!stash)
return 0;
if ((level > 100) || (level < -100))
croak("Recursive inheritance detected while looking for method '%s' in package '%s'",
name, HvNAME(stash));
DEBUG_o( deb("Looking for method %s in package %s\n",name,HvNAME(stash)) );
gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
if (!gvp)
topgv = Nullgv;
else {
topgv = *gvp;
if (SvTYPE(topgv) != SVt_PVGV)
gv_init(topgv, stash, name, len, TRUE);
if (cv = GvCV(topgv)) {
/* If genuine method or valid cache entry, use it */
if (!GvCVGEN(topgv) || GvCVGEN(topgv) == PL_sub_generation)
return topgv;
/* Stale cached entry: junk it */
SvREFCNT_dec(cv);
GvCV(topgv) = cv = Nullcv;
GvCVGEN(topgv) = 0;
}
else if (GvCVGEN(topgv) == PL_sub_generation)
return 0; /* cache indicates sub doesn't exist */
}
gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
av = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : Nullav;
/* create and re-create @.*::SUPER::ISA on demand */
if (!av || !SvMAGIC(av)) {
char* packname = HvNAME(stash);
STRLEN packlen = strlen(packname);
if (packlen >= 7 && strEQ(packname + packlen - 7, "::SUPER")) {
HV* basestash;
packlen -= 7;
basestash = gv_stashpvn(packname, packlen, TRUE);
gvp = (GV**)hv_fetch(basestash, "ISA", 3, FALSE);
if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
dTHR; /* just for SvREFCNT_dec */
gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
if (!gvp || !(gv = *gvp))
croak("Cannot create %s::ISA", HvNAME(stash));
if (SvTYPE(gv) != SVt_PVGV)
gv_init(gv, stash, "ISA", 3, TRUE);
SvREFCNT_dec(GvAV(gv));
GvAV(gv) = (AV*)SvREFCNT_inc(av);
}
}
}
if (av) {
SV** svp = AvARRAY(av);
/* NOTE: No support for tied ISA */
I32 items = AvFILLp(av) + 1;
while (items--) {
SV* sv = *svp++;
HV* basestash = gv_stashsv(sv, FALSE);
if (!basestash) {
if (PL_dowarn)
warn("Can't locate package %s for @%s::ISA",
SvPVX(sv), HvNAME(stash));
continue;
}
gv = gv_fetchmeth(basestash, name, len,
(level >= 0) ? level + 1 : level - 1);
if (gv)
goto gotcha;
}
}
/* if at top level, try UNIVERSAL */
if (level == 0 || level == -1) {
HV* lastchance;
if (lastchance = gv_stashpvn("UNIVERSAL", 9, FALSE)) {
if (gv = gv_fetchmeth(lastchance, name, len,
(level >= 0) ? level + 1 : level - 1)) {
gotcha:
/*
* Cache method in topgv if:
* 1. topgv has no synonyms (else inheritance crosses wires)
* 2. method isn't a stub (else AUTOLOAD fails spectacularly)
*/
if (topgv &&
GvREFCNT(topgv) == 1 &&
(cv = GvCV(gv)) &&
(CvROOT(cv) || CvXSUB(cv)))
{
if (cv = GvCV(topgv))
SvREFCNT_dec(cv);
GvCV(topgv) = (CV*)SvREFCNT_inc(GvCV(gv));
GvCVGEN(topgv) = PL_sub_generation;
}
return gv;
}
else if (topgv && GvREFCNT(topgv) == 1) {
/* cache the fact that the method is not defined */
GvCVGEN(topgv) = PL_sub_generation;
}
}
}
return 0;
}
GV *
gv_fetchmethod(HV *stash, char *name)
{
return gv_fetchmethod_autoload(stash, name, TRUE);
}
GV *
gv_fetchmethod_autoload(HV *stash, char *name, I32 autoload)
{
dTHR;
register char *nend;
char *nsplit = 0;
GV* gv;
for (nend = name; *nend; nend++) {
if (*nend == '\'')
nsplit = nend;
else if (*nend == ':' && *(nend + 1) == ':')
nsplit = ++nend;
}
if (nsplit) {
char *origname = name;
name = nsplit + 1;
if (*nsplit == ':')
--nsplit;
if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
/* ->SUPER::method should really be looked up in original stash */
SV *tmpstr = sv_2mortal(newSVpvf("%s::SUPER",
HvNAME(PL_curcop->cop_stash)));
stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
DEBUG_o( deb("Treating %s as %s::%s\n",
origname, HvNAME(stash), name) );
}
else
stash = gv_stashpvn(origname, nsplit - origname, TRUE);
}
gv = gv_fetchmeth(stash, name, nend - name, 0);
if (!gv) {
if (strEQ(name,"import"))
gv = (GV*)&PL_sv_yes;
else if (autoload)
gv = gv_autoload4(stash, name, nend - name, TRUE);
}
else if (autoload) {
CV* cv = GvCV(gv);
if (!CvROOT(cv) && !CvXSUB(cv)) {
GV* stubgv;
GV* autogv;
if (CvANON(cv))
stubgv = gv;
else {
stubgv = CvGV(cv);
if (GvCV(stubgv) != cv) /* orphaned import */
stubgv = gv;
}
autogv = gv_autoload4(GvSTASH(stubgv),
GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
if (autogv)
gv = autogv;
}
}
return gv;
}
GV*
gv_autoload4(HV *stash, char *name, STRLEN len, I32 method)
{
static char autoload[] = "AUTOLOAD";
static STRLEN autolen = 8;
GV* gv;
CV* cv;
HV* varstash;
GV* vargv;
SV* varsv;
if (len == autolen && strnEQ(name, autoload, autolen))
return Nullgv;
if (!(gv = gv_fetchmeth(stash, autoload, autolen, FALSE)))
return Nullgv;
cv = GvCV(gv);
/*
* Inheriting AUTOLOAD for non-methods works ... for now.
*/
if (PL_dowarn && !method && (GvCVGEN(gv) || GvSTASH(gv) != stash))
warn(
"Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
HvNAME(stash), (int)len, name);
/*
* Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
* The subroutine's original name may not be "AUTOLOAD", so we don't
* use that, but for lack of anything better we will use the sub's
* original package to look up $AUTOLOAD.
*/
varstash = GvSTASH(CvGV(cv));
vargv = *(GV**)hv_fetch(varstash, autoload, autolen, TRUE);
if (!isGV(vargv))
gv_init(vargv, varstash, autoload, autolen, FALSE);
varsv = GvSV(vargv);
sv_setpv(varsv, HvNAME(stash));
sv_catpvn(varsv, "::", 2);
sv_catpvn(varsv, name, len);
SvTAINTED_off(varsv);
return gv;
}
HV*
gv_stashpv(char *name, I32 create)
{
return gv_stashpvn(name, strlen(name), create);
}
HV*
gv_stashpvn(char *name, U32 namelen, I32 create)
{
char smallbuf[256];
char *tmpbuf;
HV *stash;
GV *tmpgv;
if (namelen + 3 < sizeof smallbuf)
tmpbuf = smallbuf;
else
New(606, tmpbuf, namelen + 3, char);
Copy(name,tmpbuf,namelen,char);
tmpbuf[namelen++] = ':';
tmpbuf[namelen++] = ':';
tmpbuf[namelen] = '\0';
tmpgv = gv_fetchpv(tmpbuf, create, SVt_PVHV);
if (tmpbuf != smallbuf)
Safefree(tmpbuf);
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 *sv, I32 create)
{
register char *ptr;
STRLEN len;
ptr = SvPV(sv,len);
return gv_stashpvn(ptr, len, create);
}
GV *
gv_fetchpv(char *nambeg, I32 add, I32 sv_type)
{
dTHR;
register char *name = nambeg;
register GV *gv = 0;
GV**gvp;
I32 len;
register char *namend;
HV *stash = 0;
U32 add_gvflags = 0;
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 = PL_defstash;
if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
return Nullgv;
len = namend - name;
if (len > 0) {
char smallbuf[256];
char *tmpbuf;
if (len + 3 < sizeof smallbuf)
tmpbuf = smallbuf;
else
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);
gv = gvp ? *gvp : Nullgv;
if (gv && gv != (GV*)&PL_sv_undef) {
if (SvTYPE(gv) != SVt_PVGV)
gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI));
else
GvMULTI_on(gv);
}
if (tmpbuf != smallbuf)
Safefree(tmpbuf);
if (!gv || gv == (GV*)&PL_sv_undef)
return Nullgv;
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 : (GV*)*hv_fetch(PL_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)) {
bool global = FALSE;
if (isUPPER(*name)) {
if (*name == 'S' && (
strEQ(name, "SIG") ||
strEQ(name, "STDIN") ||
strEQ(name, "STDOUT") ||
strEQ(name, "STDERR")))
global = TRUE;
else if (*name == 'I' && strEQ(name, "INC"))
global = TRUE;
else 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 = PL_defstash;
else if ((COP*)PL_curcop == &PL_compiling) {
stash = PL_curstash;
if (add && (PL_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*)&PL_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 (GvCVu(*gvp))
warn("(Did you mean &%s instead?)\n", name);
stash = 0;
}
}
}
else
stash = PL_curcop->cop_stash;
}
else
stash = PL_defstash;
}
/* By this point we should have a stash and a name */
if (!stash) {
if (!add)
return Nullgv;
if (add & ~GV_ADDMULTI) {
char sv_type_char = ((sv_type == SVt_PV) ? '$'
: (sv_type == SVt_PVAV) ? '@'
: (sv_type == SVt_PVHV) ? '%'
: 0);
if (sv_type_char)
warn("Global symbol \"%c%s\" requires explicit package name",
sv_type_char, name);
else
warn("Global symbol \"%s\" requires explicit package name",
name);
}
++PL_error_count;
stash = PL_curstash ? PL_curstash : PL_defstash; /* avoid core dumps */
add_gvflags = ((sv_type == SVt_PV) ? GVf_IMPORTED_SV
: (sv_type == SVt_PVAV) ? GVf_IMPORTED_AV
: (sv_type == SVt_PVHV) ? GVf_IMPORTED_HV
: 0);
}
if (!SvREFCNT(stash)) /* symbol table under destruction */
return Nullgv;
gvp = (GV**)hv_fetch(stash,name,len,add);
if (!gvp || *gvp == (GV*)&PL_sv_undef)
return Nullgv;
gv = *gvp;
if (SvTYPE(gv) == SVt_PVGV) {
if (add) {
GvMULTI_on(gv);
gv_init_sv(gv, sv_type);
}
return gv;
} else if (add & GV_NOINIT) {
return gv;
}
/* Adding a new symbol */
if (add & GV_ADDWARN)
warn("Had to create %s unexpectedly", nambeg);
gv_init(gv, stash, name, len, add & GV_ADDMULTI);
gv_init_sv(gv, sv_type);
GvFLAGS(gv) |= add_gvflags;
/* set up magic where warranted */
switch (*name) {
case 'A':
if (strEQ(name, "ARGV")) {
IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
}
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);
/* NOTE: No support for tied ISA */
if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA")
&& AvFILLp(av) == -1)
{
char *pname;
av_push(av, newSVpv(pname = "NDBM_File",0));
gv_stashpvn(pname, 9, TRUE);
av_push(av, newSVpv(pname = "DB_File",0));
gv_stashpvn(pname, 7, TRUE);
av_push(av, newSVpv(pname = "GDBM_File",0));
gv_stashpvn(pname, 9, TRUE);
av_push(av, newSVpv(pname = "SDBM_File",0));
gv_stashpvn(pname, 9, TRUE);
av_push(av, newSVpv(pname = "ODBM_File",0));
gv_stashpvn(pname, 9, TRUE);
}
}
break;
#ifdef OVERLOAD
case 'O':
if (strEQ(name, "OVERLOAD")) {
HV* hv = GvHVn(gv);
GvMULTI_on(gv);
hv_magic(hv, gv, 'A');
}
break;
#endif /* OVERLOAD */
case 'S':
if (strEQ(name, "SIG")) {
HV *hv;
I32 i;
PL_siggv = gv;
GvMULTI_on(PL_siggv);
hv = GvHVn(PL_siggv);
hv_magic(hv, PL_siggv, 'S');
for(i=1;sig_name[i];i++) {
SV ** init;
init=hv_fetch(hv,sig_name[i],strlen(sig_name[i]),1);
if(init)
sv_setsv(*init,&PL_sv_undef);
psig_ptr[i] = 0;
psig_name[i] = 0;
}
}
break;
case '&':
if (len > 1)
break;
PL_ampergv = gv;
PL_sawampersand = TRUE;
goto ro_magicalize;
case '`':
if (len > 1)
break;
PL_leftgv = gv;
PL_sawampersand = TRUE;
goto ro_magicalize;
case '\'':
if (len > 1)
break;
PL_rightgv = gv;
PL_sawampersand = TRUE;
goto ro_magicalize;
case ':':
if (len > 1)
break;
sv_setpv(GvSV(gv),PL_chopset);
goto magicalize;
case '?':
if (len > 1)
break;
#ifdef COMPLEX_STATUS
sv_upgrade(GvSV(gv), SVt_PVLV);
#endif
goto magicalize;
case '!':
if (len > 1)
break;
if (sv_type > SVt_PV && PL_curcop != &PL_compiling) {
HV* stash = gv_stashpvn("Errno",5,FALSE);
if(!stash || !(gv_fetchmethod(stash, "TIEHASH"))) {
dSP;
PUTBACK;
perl_require_pv("Errno.pm");
SPAGAIN;
stash = gv_stashpvn("Errno",5,FALSE);
if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
croak("Can't use %%! because Errno.pm is not available");
}
}
goto magicalize;
case '#':
case '*':
if (PL_dowarn && len == 1 && sv_type == SVt_PV)
warn("Use of $%s is deprecated", name);
/* FALL THROUGH */
case '[':
case '^':
case '~':
case '=':
case '-':
case '%':
case '.':
case '(':
case ')':
case '<':
case '>':
case ',':
case '\\':
case '/':
case '|':
case '\001':
case '\003':
case '\004':
case '\005':
case '\006':
case '\010':
case '\011': /* NOT \t in EBCDIC */
case '\017':
case '\020':
case '\024':
case '\027':
if (len > 1)
break;
goto magicalize;
case '+':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '\023':
ro_magicalize:
SvREADONLY_on(GvSV(gv));
magicalize:
sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
break;
case '\014':
if (len > 1)
break;
sv_setpv(GvSV(gv),"\f");
PL_formfeed = GvSV(gv);
break;
case ';':
if (len > 1)
break;
sv_setpv(GvSV(gv),"\034");
break;
case ']':
if (len == 1) {
SV *sv = GvSV(gv);
sv_upgrade(sv, SVt_PVNV);
sv_setpv(sv, PL_patchlevel);
(void)sv_2nv(sv);
SvREADONLY_on(sv);
}
break;
}
return gv;
}
void
gv_fullname3(SV *sv, GV *gv, char *prefix)
{
HV *hv = GvSTASH(gv);
if (!hv) {
SvOK_off(sv);
return;
}
sv_setpv(sv, prefix ? prefix : "");
sv_catpv(sv,HvNAME(hv));
sv_catpvn(sv,"::", 2);
sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
}
void
gv_efullname3(SV *sv, GV *gv, char *prefix)
{
GV *egv = GvEGV(gv);
if (!egv)
egv = gv;
gv_fullname3(sv, egv, prefix);
}
/* XXX compatibility with versions <= 5.003. */
void
gv_fullname(SV *sv, GV *gv)
{
gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
}
/* XXX compatibility with versions <= 5.003. */
void
gv_efullname(SV *sv, GV *gv)
{
gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
}
IO *
newIO(void)
{
dTHR;
IO *io;
GV *iogv;
io = (IO*)NEWSV(0,0);
sv_upgrade((SV *)io,SVt_PVIO);
SvREFCNT(io) = 1;
SvOBJECT_on(io);
iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
/* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */
if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv))))
iogv = gv_fetchpv("IO::Handle::", TRUE, SVt_PVHV);
SvSTASH(io) = (HV*)SvREFCNT_inc(GvHV(iogv));
return io;
}
void
gv_check(HV *stash)
{
dTHR;
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 = HeNEXT(entry)) {
if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
(gv = (GV*)HeVAL(entry)) && (hv = GvHV(gv)) && HvNAME(hv))
{
if (hv != PL_defstash)
gv_check(hv); /* nested package */
}
else if (isALPHA(*HeKEY(entry))) {
gv = (GV*)HeVAL(entry);
if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
continue;
PL_curcop->cop_line = GvLINE(gv);
filegv = GvFILEGV(gv);
PL_curcop->cop_filegv = filegv;
if (filegv && GvMULTI(filegv)) /* Filename began with slash */
continue;
warn("Name \"%s::%s\" used only once: possible typo",
HvNAME(stash), GvNAME(gv));
}
}
}
}
GV *
newGVgen(char *pack)
{
return gv_fetchpv(form("%s::_GEN_%ld", pack, (long)PL_gensym++),
TRUE, SVt_PVGV);
}
/* hopefully this is only called on local symbol table entries */
GP*
gp_ref(GP *gp)
{
gp->gp_refcnt++;
if (gp->gp_cv) {
if (gp->gp_cvgen) {
/* multi-named GPs cannot be used for method cache */
SvREFCNT_dec(gp->gp_cv);
gp->gp_cv = Nullcv;
gp->gp_cvgen = 0;
}
else {
/* Adding a new name to a subroutine invalidates method cache */
PL_sub_generation++;
}
}
return gp;
}
void
gp_free(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_cv) {
/* Deleting the name of a subroutine invalidates method cache */
PL_sub_generation++;
}
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);
SvREFCNT_dec(gp->gp_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(HV *stash)
{
dTHR;
GV** gvp;
HV* hv;
GV* gv;
CV* cv;
MAGIC* mg=mg_find((SV*)stash,'c');
AMT *amtp = (mg) ? (AMT*)mg->mg_ptr: (AMT *) NULL;
AMT amt;
STRLEN n_a;
if (mg && amtp->was_ok_am == PL_amagic_generation
&& amtp->was_ok_sub == PL_sub_generation)
return AMT_AMAGIC(amtp);
if (amtp && AMT_AMAGIC(amtp)) { /* Have table. */
int i;
for (i=1; i<NofAMmeth; 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)) );
amt.was_ok_am = PL_amagic_generation;
amt.was_ok_sub = PL_sub_generation;
amt.fallback = AMGfallNO;
amt.flags = 0;
#ifdef OVERLOAD_VIA_HASH
gvp=(GV**)hv_fetch(stash,"OVERLOAD",8,FALSE); /* A shortcut */
if (gvp && ((gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv)))) {
int filled=0;
int i;
char *cp;
SV* sv;
SV** svp;
/* 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; i++) {
cv = 0;
cp = (char *)AMG_names[i];
svp = (SV**)hv_fetch(hv, cp, strlen(cp), FALSE);
if (svp && ((sv = *svp) != &PL_sv_undef)) {
switch (SvTYPE(sv)) {
default:
if (!SvROK(sv)) {
if (!SvOK(sv)) break;
gv = gv_fetchmethod(stash, SvPV(sv, n_a));
if (gv) cv = GvCV(gv);
break;
}
cv = (CV*)SvRV(sv);
if (SvTYPE(cv) == SVt_PVCV)
break;
/* FALL THROUGH */
case SVt_PVHV:
case SVt_PVAV:
croak("Not a subroutine reference in overload table");
return FALSE;
case SVt_PVCV:
cv = (CV*)sv;
break;
case SVt_PVGV:
if (!(cv = GvCVu((GV*)sv)))
cv = sv_2cv(sv, &stash, &gv, TRUE);
break;
}
if (cv) filled=1;
else {
croak("Method for operation %s not found in package %.256s during blessing\n",
cp,HvNAME(stash));
return FALSE;
}
}
#else
{
int filled = 0;
int i;
const char *cp;
SV* sv = NULL;
SV** svp;
/* Work with "fallback" key, which we assume to be first in AMG_names */
if ( cp = AMG_names[0] ) {
/* Try to find via inheritance. */
gv = gv_fetchmeth(stash, "()", 2, -1); /* A cookie: "()". */
if (gv) sv = GvSV(gv);
if (!gv) goto no_table;
else if (SvTRUE(sv)) amt.fallback=AMGfallYES;
else if (SvOK(sv)) amt.fallback=AMGfallNEVER;
}
for (i = 1; i < NofAMmeth; i++) {
SV *cookie = sv_2mortal(newSVpvf("(%s", cp = AMG_names[i]));
DEBUG_o( deb("Checking overloading of `%s' in package `%.256s'\n",
cp, HvNAME(stash)) );
/* don't fill the cache while looking up! */
gv = gv_fetchmeth(stash, SvPVX(cookie), SvCUR(cookie), -1);
cv = 0;
if(gv && (cv = GvCV(gv))) {
if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")
&& strEQ(HvNAME(GvSTASH(CvGV(cv))), "overload")) {
/* GvSV contains the name of the method. */
GV *ngv;
DEBUG_o( deb("Resolving method `%.256s' for overloaded `%s' in package `%.256s'\n",
SvPV(GvSV(gv), n_a), cp, HvNAME(stash)) );
if (!SvPOK(GvSV(gv))
|| !(ngv = gv_fetchmethod_autoload(stash, SvPVX(GvSV(gv)),
FALSE)))
{
/* Can be an import stub (created by `can'). */
if (GvCVGEN(gv)) {
croak("Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'",
(SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
cp, HvNAME(stash));
} else
croak("Cannot resolve method `%.256s' overloading `%s' in package `%.256s'",
(SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
cp, HvNAME(stash));
}
cv = GvCV(gv = ngv);
}
DEBUG_o( deb("Overloading `%s' in package `%.256s' via `%.256s::%.256s' \n",
cp, HvNAME(stash), HvNAME(GvSTASH(CvGV(cv))),
GvNAME(CvGV(cv))) );
filled = 1;
}
#endif
amt.table[i]=(CV*)SvREFCNT_inc(cv);
}
if (filled) {
AMT_AMAGIC_on(&amt);
sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMT));
return TRUE;
}
}
/* Here we have no table: */
no_table:
AMT_AMAGIC_off(&amt);
sv_magic((SV*)stash, 0, 'c', (char*)&amt, sizeof(AMTS));
return FALSE;
}
SV*
amagic_call(SV *left, SV *right, int method, int flags)
{
dTHR;
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, force_cpy = 0, assignshift = assign ? 1 : 0;
HV* stash;
if (!(AMGf_noleft & flags) && SvAMAGIC(left)
&& (mg = mg_find((SV*)(stash=SvSTASH(SvRV(left))),'c'))
&& (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
: (CV **) NULL))
&& ((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 */
/* In all the covered cases we should be called with assign==0. */
switch (method) {
case inc_amg:
force_cpy = 1;
if ((cv = cvp[off=add_ass_amg])
|| ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
right = &PL_sv_yes; lr = -1; assign = 1;
}
break;
case dec_amg:
force_cpy = 1;
if ((cv = cvp[off = subtr_ass_amg])
|| ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
right = &PL_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 not_amg:
(void)((cv = cvp[off=bool__amg])
|| (cv = cvp[off=numer_amg])
|| (cv = cvp[off=string_amg]));
postpr = 1;
break;
case copy_amg:
{
/*
* SV* ref causes confusion with the interpreter variable of
* the same name
*/
SV* tmpRef=SvRV(left);
if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
/*
* Just to be extra cautious. Maybe in some
* additional cases sv_setsv is safe, too.
*/
SV* newref = newSVsv(tmpRef);
SvOBJECT_on(newref);
SvSTASH(newref) = (HV*)SvREFCNT_inc(SvSTASH(tmpRef));
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 = (AMT_AMAGIC((AMT*)mg->mg_ptr)
? (amtp = (AMT*)mg->mg_ptr)->table
: (CV **) NULL))
&& (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
* concatenation */
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 croak */
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 {
SV *msg;
if (off==-1) off=method;
msg = sv_2mortal(newSVpvf(
"Operation `%s': no method found,%sargument %s%s%s%s",
AMG_names[method + assignshift],
(flags & AMGf_unary ? " " : "\n\tleft "),
SvAMAGIC(left)?
"in overloaded package ":
"has no overloaded magic",
SvAMAGIC(left)?
HvNAME(SvSTASH(SvRV(left))):
"",
SvAMAGIC(right)?
",\n\tright argument in overloaded package ":
(flags & AMGf_unary
? ""
: ",\n\tright argument has no overloaded magic"),
SvAMAGIC(right)?
HvNAME(SvSTASH(SvRV(right))):
""));
if (amtp && amtp->fallback >= AMGfallYES) {
DEBUG_o( deb("%s", SvPVX(msg)) );
} else {
croak("%_", msg);
}
return NULL;
}
force_cpy = force_cpy || assign;
}
}
if (!notfound) {
DEBUG_o( deb(
"Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
AMG_names[off],
method+assignshift==off? "" :
" (initially `",
method+assignshift==off? "" :
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
*/
/* We need to copy in following cases:
* a) Assignment form was called.
* assignshift==1, assign==T, method + 1 == off
* b) Increment or decrement, called directly.
* assignshift==0, assign==0, method + 0 == off
* c) Increment or decrement, translated to assignment add/subtr.
* assignshift==0, assign==T,
* force_cpy == T
* d) Increment or decrement, translated to nomethod.
* assignshift==0, assign==0,
* force_cpy == T
* e) Assignment form translated to nomethod.
* assignshift==1, assign==T, method + 1 != off
* force_cpy == T
*/
/* off is method, method+assignshift, or a result of opcode substitution.
* In the latter case assignshift==0, so only notfound case is important.
*/
if (( (method + assignshift == off)
&& (assign || (method == inc_amg) || (method == dec_amg)))
|| force_cpy)
RvDEEPCP(left);
{
dSP;
BINOP myop;
SV* res;
bool oldcatch = CATCH_GET;
CATCH_SET(TRUE);
Zero(&myop, 1, BINOP);
myop.op_last = (OP *) &myop;
myop.op_next = Nullop;
myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
PUSHSTACKi(PERLSI_OVERLOAD);
ENTER;
SAVEOP();
PL_op = (OP *) &myop;
if (PERLDB_SUB && PL_curstash != PL_debstash)
PL_op->op_private |= OPpENTERSUB_DB;
PUTBACK;
pp_pushmark(ARGS);
EXTEND(SP, notfound + 5);
PUSHs(lr>0? right: left);
PUSHs(lr>0? left: right);
PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
if (notfound) {
PUSHs( sv_2mortal(newSVpv((char *)AMG_names[method + assignshift],0)) );
}
PUSHs((SV*)cv);
PUTBACK;
if (PL_op = pp_entersub(ARGS))
CALLRUNOPS();
LEAVE;
SPAGAIN;
res=POPs;
POPSTACK;
CATCH_SET(oldcatch);
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 left;
case not_amg:
ans=!SvOK(res); break;
}
return boolSV(ans);
} else if (method==copy_amg) {
if (!SvROK(res)) {
croak("Copy method did not return a reference");
}
return SvREFCNT_inc(SvRV(res));
} else {
return res;
}
}
}
#endif /* OVERLOAD */
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