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freebsd/contrib/perl5/gv.c
Mark Murray fc75d06644 Vendor import Perl 5.6.1
2002-03-16 20:14:30 +00:00

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/* gv.c
*
* Copyright (c) 1991-2001, 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"
#define PERL_IN_GV_C
#include "perl.h"
GV *
Perl_gv_AVadd(pTHX_ register GV *gv)
{
if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
Perl_croak(aTHX_ "Bad symbol for array");
if (!GvAV(gv))
GvAV(gv) = newAV();
return gv;
}
GV *
Perl_gv_HVadd(pTHX_ register GV *gv)
{
if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
Perl_croak(aTHX_ "Bad symbol for hash");
if (!GvHV(gv))
GvHV(gv) = newHV();
return gv;
}
GV *
Perl_gv_IOadd(pTHX_ register GV *gv)
{
if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
Perl_croak(aTHX_ "Bad symbol for filehandle");
if (!GvIOp(gv))
GvIOp(gv) = newIO();
return gv;
}
GV *
Perl_gv_fetchfile(pTHX_ const char *name)
{
char smallbuf[256];
char *tmpbuf;
STRLEN tmplen;
GV *gv;
if (!PL_defstash)
return Nullgv;
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);
sv_setpv(GvSV(gv), name);
if (PERLDB_LINE)
hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, 'L');
}
if (tmpbuf != smallbuf)
Safefree(tmpbuf);
return gv;
}
void
Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
{
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) = CopLINE(PL_curcop);
GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : "";
GvCVGEN(gv) = 0;
GvEGV(gv) = gv;
sv_magic((SV*)gv, (SV*)gv, '*', Nullch, 0);
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;
CvFILE(GvCV(gv)) = CopFILE(PL_curcop);
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
S_gv_init_sv(pTHX_ 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;
}
}
/*
=for apidoc gv_fetchmeth
Returns the glob with the given C<name> and a defined subroutine or
C<NULL>. The glob lives in the given C<stash>, or in the stashes
accessible via @ISA and @UNIVERSAL.
The argument C<level> should be either 0 or -1. If C<level==0>, as a
side-effect creates a glob with the given C<name> in the given C<stash>
which in the case of success contains an alias for the subroutine, and sets
up caching info for this glob. Similarly for all the searched stashes.
This function grants C<"SUPER"> token as a postfix of the stash name. The
GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
visible to Perl code. So when calling C<call_sv>, you should not use
the GV directly; instead, you should use the method's CV, which can be
obtained from the GV with the C<GvCV> macro.
=cut
*/
GV *
Perl_gv_fetchmeth(pTHX_ HV *stash, const 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))
Perl_croak(aTHX_ "Recursive inheritance detected while looking for method '%s' in package '%s'",
name, HvNAME(stash));
DEBUG_o( Perl_deb(aTHX_ "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))) {
gvp = (GV**)hv_fetch(stash, "ISA", 3, TRUE);
if (!gvp || !(gv = *gvp))
Perl_croak(aTHX_ "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 (ckWARN(WARN_MISC))
Perl_warner(aTHX_ WARN_MISC, "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;
}
/*
=for apidoc gv_fetchmethod
See L<gv_fetchmethod_autoload>.
=cut
*/
GV *
Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
{
return gv_fetchmethod_autoload(stash, name, TRUE);
}
/*
=for apidoc gv_fetchmethod_autoload
Returns the glob which contains the subroutine to call to invoke the method
on the C<stash>. In fact in the presence of autoloading this may be the
glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
already setup.
The third parameter of C<gv_fetchmethod_autoload> determines whether
AUTOLOAD lookup is performed if the given method is not present: non-zero
means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
with a non-zero C<autoload> parameter.
These functions grant C<"SUPER"> token as a prefix of the method name. Note
that if you want to keep the returned glob for a long time, you need to
check for it being "AUTOLOAD", since at the later time the call may load a
different subroutine due to $AUTOLOAD changing its value. Use the glob
created via a side effect to do this.
These functions have the same side-effects and as C<gv_fetchmeth> with
C<level==0>. C<name> should be writable if contains C<':'> or C<'
''>. The warning against passing the GV returned by C<gv_fetchmeth> to
C<call_sv> apply equally to these functions.
=cut
*/
GV *
Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
{
register const char *nend;
const char *nsplit = 0;
GV* gv;
for (nend = name; *nend; nend++) {
if (*nend == '\'')
nsplit = nend;
else if (*nend == ':' && *(nend + 1) == ':')
nsplit = ++nend;
}
if (nsplit) {
const 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(Perl_newSVpvf(aTHX_ "%s::SUPER",
CopSTASHPV(PL_curcop)));
stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
DEBUG_o( Perl_deb(aTHX_ "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") || strEQ(name,"unimport"))
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*
Perl_gv_autoload4(pTHX_ HV *stash, const 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);
if (!CvROOT(cv))
return Nullgv;
/*
* Inheriting AUTOLOAD for non-methods works ... for now.
*/
if (ckWARN(WARN_DEPRECATED) && !method &&
(GvCVGEN(gv) || GvSTASH(gv) != stash))
Perl_warner(aTHX_ WARN_DEPRECATED,
"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);
ENTER;
#ifdef USE_THREADS
sv_lock((SV *)varstash);
#endif
if (!isGV(vargv))
gv_init(vargv, varstash, autoload, autolen, FALSE);
LEAVE;
varsv = GvSV(vargv);
#ifdef USE_THREADS
sv_lock(varsv);
#endif
sv_setpv(varsv, HvNAME(stash));
sv_catpvn(varsv, "::", 2);
sv_catpvn(varsv, name, len);
SvTAINTED_off(varsv);
return gv;
}
/*
=for apidoc gv_stashpv
Returns a pointer to the stash for a specified package. C<name> should
be a valid UTF-8 string. If C<create> is set then the package will be
created if it does not already exist. If C<create> is not set and the
package does not exist then NULL is returned.
=cut
*/
HV*
Perl_gv_stashpv(pTHX_ const char *name, I32 create)
{
return gv_stashpvn(name, strlen(name), create);
}
HV*
Perl_gv_stashpvn(pTHX_ const 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;
}
/*
=for apidoc gv_stashsv
Returns a pointer to the stash for a specified package, which must be a
valid UTF-8 string. See C<gv_stashpv>.
=cut
*/
HV*
Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
{
register char *ptr;
STRLEN len;
ptr = SvPV(sv,len);
return gv_stashpvn(ptr, len, create);
}
GV *
Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
{
register const char *name = nambeg;
register GV *gv = 0;
GV**gvp;
I32 len;
register const char *namend;
HV *stash = 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_lazy(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)) )
{
Perl_warn(aTHX_ "Variable \"%c%s\" is not imported",
sv_type == SVt_PVAV ? '@' :
sv_type == SVt_PVHV ? '%' : '$',
name);
if (GvCVu(*gvp))
Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name);
stash = 0;
}
}
}
else
stash = CopSTASH(PL_curcop);
}
else
stash = PL_defstash;
}
/* By this point we should have a stash and a name */
if (!stash) {
if (add) {
qerror(Perl_mess(aTHX_
"Global symbol \"%s%s\" requires explicit package name",
(sv_type == SVt_PV ? "$"
: sv_type == SVt_PVAV ? "@"
: sv_type == SVt_PVHV ? "%"
: ""), name));
stash = PL_nullstash;
}
else
return Nullgv;
}
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 && ckWARN_d(WARN_INTERNAL))
Perl_warner(aTHX_ WARN_INTERNAL, "Had to create %s unexpectedly", nambeg);
gv_init(gv, stash, name, len, add & GV_ADDMULTI);
gv_init_sv(gv, sv_type);
if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE)
: (PL_dowarn & G_WARN_ON ) ) )
GvMULTI_on(gv) ;
/* 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, newSVpvn(pname = "NDBM_File",9));
gv_stashpvn(pname, 9, TRUE);
av_push(av, newSVpvn(pname = "DB_File",7));
gv_stashpvn(pname, 7, TRUE);
av_push(av, newSVpvn(pname = "GDBM_File",9));
gv_stashpvn(pname, 9, TRUE);
av_push(av, newSVpvn(pname = "SDBM_File",9));
gv_stashpvn(pname, 9, TRUE);
av_push(av, newSVpvn(pname = "ODBM_File",9));
gv_stashpvn(pname, 9, TRUE);
}
}
break;
case 'O':
if (strEQ(name, "OVERLOAD")) {
HV* hv = GvHVn(gv);
GvMULTI_on(gv);
hv_magic(hv, Nullgv, 'A');
}
break;
case 'S':
if (strEQ(name, "SIG")) {
HV *hv;
I32 i;
if (!PL_psig_ptr) {
int sig_num[] = { SIG_NUM };
New(73, PL_psig_ptr, sizeof(sig_num)/sizeof(*sig_num), SV*);
New(73, PL_psig_name, sizeof(sig_num)/sizeof(*sig_num), SV*);
}
GvMULTI_on(gv);
hv = GvHVn(gv);
hv_magic(hv, Nullgv, 'S');
for (i = 1; PL_sig_name[i]; i++) {
SV ** init;
init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
if (init)
sv_setsv(*init, &PL_sv_undef);
PL_psig_ptr[i] = 0;
PL_psig_name[i] = 0;
}
}
break;
case 'V':
if (strEQ(name, "VERSION"))
GvMULTI_on(gv);
break;
case '&':
if (len > 1)
break;
PL_sawampersand = TRUE;
goto ro_magicalize;
case '`':
if (len > 1)
break;
PL_sawampersand = TRUE;
goto ro_magicalize;
case '\'':
if (len > 1)
break;
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
(void)SvUPGRADE(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;
require_pv("Errno.pm");
SPAGAIN;
stash = gv_stashpvn("Errno",5,FALSE);
if (!stash || !(gv_fetchmethod(stash, "TIEHASH")))
Perl_croak(aTHX_ "Can't use %%! because Errno.pm is not available");
}
}
goto magicalize;
case '-':
if (len > 1)
break;
else {
AV* av = GvAVn(gv);
sv_magic((SV*)av, Nullsv, 'D', Nullch, 0);
SvREADONLY_on(av);
}
goto magicalize;
case '#':
case '*':
if (ckWARN(WARN_DEPRECATED) && len == 1 && sv_type == SVt_PV)
Perl_warner(aTHX_ WARN_DEPRECATED, "Use of $%s is deprecated", name);
/* FALL THROUGH */
case '[':
case '^':
case '~':
case '=':
case '%':
case '.':
case '(':
case ')':
case '<':
case '>':
case ',':
case '\\':
case '/':
case '\001': /* $^A */
case '\003': /* $^C */
case '\004': /* $^D */
case '\005': /* $^E */
case '\006': /* $^F */
case '\010': /* $^H */
case '\011': /* $^I, NOT \t in EBCDIC */
case '\017': /* $^O */
case '\020': /* $^P */
case '\024': /* $^T */
if (len > 1)
break;
goto magicalize;
case '|':
if (len > 1)
break;
sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
goto magicalize;
case '\023': /* $^S */
if (len > 1)
break;
goto ro_magicalize;
case '\027': /* $^W & $^WARNING_BITS */
if (len > 1 && strNE(name, "\027ARNING_BITS")
&& strNE(name, "\027IDE_SYSTEM_CALLS"))
break;
goto magicalize;
case '+':
if (len > 1)
break;
else {
AV* av = GvAVn(gv);
sv_magic((SV*)av, (SV*)av, 'D', Nullch, 0);
SvREADONLY_on(av);
}
/* FALL THROUGH */
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': /* $^L */
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);
(void)SvUPGRADE(sv, SVt_PVNV);
Perl_sv_setpvf(aTHX_ sv,
#if defined(PERL_SUBVERSION) && (PERL_SUBVERSION > 0)
"%8.6"
#else
"%5.3"
#endif
NVff,
SvNVX(PL_patchlevel));
SvNVX(sv) = SvNVX(PL_patchlevel);
SvNOK_on(sv);
SvREADONLY_on(sv);
}
break;
case '\026': /* $^V */
if (len == 1) {
SV *sv = GvSV(gv);
GvSV(gv) = SvREFCNT_inc(PL_patchlevel);
SvREFCNT_dec(sv);
}
break;
}
return gv;
}
void
Perl_gv_fullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
{
HV *hv = GvSTASH(gv);
if (!hv) {
(void)SvOK_off(sv);
return;
}
sv_setpv(sv, prefix ? prefix : "");
if (keepmain || strNE(HvNAME(hv), "main")) {
sv_catpv(sv,HvNAME(hv));
sv_catpvn(sv,"::", 2);
}
sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
}
void
Perl_gv_fullname3(pTHX_ SV *sv, GV *gv, const char *prefix)
{
HV *hv = GvSTASH(gv);
if (!hv) {
(void)SvOK_off(sv);
return;
}
sv_setpv(sv, prefix ? prefix : "");
sv_catpv(sv,HvNAME(hv));
sv_catpvn(sv,"::", 2);
sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv));
}
void
Perl_gv_efullname4(pTHX_ SV *sv, GV *gv, const char *prefix, bool keepmain)
{
GV *egv = GvEGV(gv);
if (!egv)
egv = gv;
gv_fullname4(sv, egv, prefix, keepmain);
}
void
Perl_gv_efullname3(pTHX_ SV *sv, GV *gv, const char *prefix)
{
GV *egv = GvEGV(gv);
if (!egv)
egv = gv;
gv_fullname3(sv, egv, prefix);
}
/* XXX compatibility with versions <= 5.003. */
void
Perl_gv_fullname(pTHX_ SV *sv, GV *gv)
{
gv_fullname3(sv, gv, sv == (SV*)gv ? "*" : "");
}
/* XXX compatibility with versions <= 5.003. */
void
Perl_gv_efullname(pTHX_ SV *sv, GV *gv)
{
gv_efullname3(sv, gv, sv == (SV*)gv ? "*" : "");
}
IO *
Perl_newIO(pTHX)
{
IO *io;
GV *iogv;
io = (IO*)NEWSV(0,0);
sv_upgrade((SV *)io,SVt_PVIO);
SvREFCNT(io) = 1;
SvOBJECT_on(io);
iogv = gv_fetchpv("FileHandle::", FALSE, SVt_PVHV);
/* unless exists($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
Perl_gv_check(pTHX_ HV *stash)
{
register HE *entry;
register I32 i;
register GV *gv;
HV *hv;
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 && hv != stash)
gv_check(hv); /* nested package */
}
else if (isALPHA(*HeKEY(entry))) {
char *file;
gv = (GV*)HeVAL(entry);
if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
continue;
file = GvFILE(gv);
/* performance hack: if filename is absolute and it's a standard
* module, don't bother warning */
if (file
&& PERL_FILE_IS_ABSOLUTE(file)
&& (instr(file, "/lib/") || instr(file, ".pm")))
{
continue;
}
CopLINE_set(PL_curcop, GvLINE(gv));
#ifdef USE_ITHREADS
CopFILE(PL_curcop) = file; /* set for warning */
#else
CopFILEGV(PL_curcop) = gv_fetchfile(file);
#endif
Perl_warner(aTHX_ WARN_ONCE,
"Name \"%s::%s\" used only once: possible typo",
HvNAME(stash), GvNAME(gv));
}
}
}
}
GV *
Perl_newGVgen(pTHX_ char *pack)
{
return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++),
TRUE, SVt_PVGV);
}
/* hopefully this is only called on local symbol table entries */
GP*
Perl_gp_ref(pTHX_ GP *gp)
{
if (!gp)
return (GP*)NULL;
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
Perl_gp_free(pTHX_ GV *gv)
{
GP* gp;
if (!gv || !(gp = GvGP(gv)))
return;
if (gp->gp_refcnt == 0) {
if (ckWARN_d(WARN_INTERNAL))
Perl_warner(aTHX_ WARN_INTERNAL,
"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 */
/* Updates and caches the CV's */
bool
Perl_Gv_AMupdate(pTHX_ HV *stash)
{
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;
#ifdef OVERLOAD_VIA_HASH
GV** gvp;
HV* hv;
#endif
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( Perl_deb(aTHX_ "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 PL_AMG_names */
if (( cp = (char *)PL_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 *)PL_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:
Perl_croak(aTHX_ "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, FALSE);
break;
}
if (cv) filled=1;
else {
Perl_croak(aTHX_ "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;
/* Work with "fallback" key, which we assume to be first in PL_AMG_names */
if ((cp = PL_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(Perl_newSVpvf(aTHX_ "(%s", cp = PL_AMG_names[i]));
DEBUG_o( Perl_deb(aTHX_ "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( Perl_deb(aTHX_ "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)) {
Perl_croak(aTHX_ "Stub found while resolving method `%.256s' overloading `%s' in package `%.256s'",
(SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
cp, HvNAME(stash));
} else
Perl_croak(aTHX_ "Can't resolve method `%.256s' overloading `%s' in package `%.256s'",
(SvPOK(GvSV(gv)) ? SvPVX(GvSV(gv)) : "???" ),
cp, HvNAME(stash));
}
cv = GvCV(gv = ngv);
}
DEBUG_o( Perl_deb(aTHX_ "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*
Perl_amagic_call(pTHX_ 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, 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;
case iter_amg: /* XXXX Eventually should do to_gv. */
/* FAIL safe */
return NULL; /* Delegate operation to standard mechanisms. */
break;
case to_sv_amg:
case to_av_amg:
case to_hv_amg:
case to_gv_amg:
case to_cv_amg:
/* FAIL safe */
return left; /* Delegate operation to standard mechanisms. */
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 */
switch (method) {
case to_sv_amg:
case to_av_amg:
case to_hv_amg:
case to_gv_amg:
case to_cv_amg:
/* FAIL safe */
return left; /* Delegate operation to standard mechanisms. */
break;
}
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(Perl_newSVpvf(aTHX_
"Operation `%s': no method found,%sargument %s%s%s%s",
PL_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( Perl_deb(aTHX_ "%s", SvPVX(msg)) );
} else {
Perl_croak(aTHX_ "%"SVf, msg);
}
return NULL;
}
force_cpy = force_cpy || assign;
}
}
if (!notfound) {
DEBUG_o( Perl_deb(aTHX_
"Overloaded operator `%s'%s%s%s:\n\tmethod%s found%s in package %s%s\n",
PL_AMG_names[off],
method+assignshift==off? "" :
" (initially `",
method+assignshift==off? "" :
PL_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();
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 *)PL_AMG_names[method + assignshift],0)));
}
PUSHs((SV*)cv);
PUTBACK;
if ((PL_op = Perl_pp_entersub(aTHX)))
CALLRUNOPS(aTHX);
LEAVE;
SPAGAIN;
res=POPs;
PUTBACK;
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=!SvTRUE(res); break;
}
return boolSV(ans);
} else if (method==copy_amg) {
if (!SvROK(res)) {
Perl_croak(aTHX_ "Copy method did not return a reference");
}
return SvREFCNT_inc(SvRV(res));
} else {
return res;
}
}
}
/*
=for apidoc is_gv_magical
Returns C<TRUE> if given the name of a magical GV.
Currently only useful internally when determining if a GV should be
created even in rvalue contexts.
C<flags> is not used at present but available for future extension to
allow selecting particular classes of magical variable.
=cut
*/
bool
Perl_is_gv_magical(pTHX_ char *name, STRLEN len, U32 flags)
{
if (!len)
return FALSE;
switch (*name) {
case 'I':
if (len == 3 && strEQ(name, "ISA"))
goto yes;
break;
case 'O':
if (len == 8 && strEQ(name, "OVERLOAD"))
goto yes;
break;
case 'S':
if (len == 3 && strEQ(name, "SIG"))
goto yes;
break;
case '\027': /* $^W & $^WARNING_BITS */
if (len == 1
|| (len == 12 && strEQ(name, "\027ARNING_BITS"))
|| (len == 17 && strEQ(name, "\027IDE_SYSTEM_CALLS")))
{
goto yes;
}
break;
case '&':
case '`':
case '\'':
case ':':
case '?':
case '!':
case '-':
case '#':
case '*':
case '[':
case '^':
case '~':
case '=':
case '%':
case '.':
case '(':
case ')':
case '<':
case '>':
case ',':
case '\\':
case '/':
case '|':
case '+':
case ';':
case ']':
case '\001': /* $^A */
case '\003': /* $^C */
case '\004': /* $^D */
case '\005': /* $^E */
case '\006': /* $^F */
case '\010': /* $^H */
case '\011': /* $^I, NOT \t in EBCDIC */
case '\014': /* $^L */
case '\017': /* $^O */
case '\020': /* $^P */
case '\023': /* $^S */
case '\024': /* $^T */
case '\026': /* $^V */
if (len == 1)
goto yes;
break;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (len > 1) {
char *end = name + len;
while (--end > name) {
if (!isDIGIT(*end))
return FALSE;
}
}
yes:
return TRUE;
default:
break;
}
return FALSE;
}
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