/* xsutils.c
*
* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004,
* by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* "Perilous to us all are the devices of an art deeper than we possess
* ourselves." --Gandalf
*/
#include "EXTERN.h"
#define PERL_IN_XSUTILS_C
#include "perl.h"
/*
* Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us).
*/
/* package attributes; */
void XS_attributes__warn_reserved(pTHX_ CV *cv);
void XS_attributes_reftype(pTHX_ CV *cv);
void XS_attributes__modify_attrs(pTHX_ CV *cv);
void XS_attributes__guess_stash(pTHX_ CV *cv);
void XS_attributes__fetch_attrs(pTHX_ CV *cv);
void XS_attributes_bootstrap(pTHX_ CV *cv);
/*
* Note that only ${pkg}::bootstrap definitions should go here.
* This helps keep down the start-up time, which is especially
* relevant for users who don't invoke any features which are
* (partially) implemented here.
*
* The various bootstrap definitions can take care of doing
* package-specific newXS() calls. Since the layout of the
* bundled *.pm files is in a version-specific directory,
* version checks in these bootstrap calls are optional.
*/
void
Perl_boot_core_xsutils(pTHX)
{
char *file = __FILE__;
newXS("attributes::bootstrap", XS_attributes_bootstrap, file);
}
#include "XSUB.h"
static int
modify_SV_attributes(pTHX_ SV *sv, SV **retlist, SV **attrlist, int numattrs)
{
SV *attr;
char *name;
STRLEN len;
bool negated;
int nret;
for (nret = 0 ; numattrs && (attr = *attrlist++); numattrs--) {
name = SvPV(attr, len);
if ((negated = (*name == '-'))) {
name++;
len--;
}
switch (SvTYPE(sv)) {
case SVt_PVCV:
switch ((int)len) {
case 6:
switch (*name) {
case 'l':
#ifdef CVf_LVALUE
if (strEQ(name, "lvalue")) {
if (negated)
CvFLAGS((CV*)sv) &= ~CVf_LVALUE;
else
CvFLAGS((CV*)sv) |= CVf_LVALUE;
continue;
}
#endif /* defined CVf_LVALUE */
if (strEQ(name, "locked")) {
if (negated)
CvFLAGS((CV*)sv) &= ~CVf_LOCKED;
else
CvFLAGS((CV*)sv) |= CVf_LOCKED;
continue;
}
break;
case 'm':
if (strEQ(name, "method")) {
if (negated)
CvFLAGS((CV*)sv) &= ~CVf_METHOD;
else
CvFLAGS((CV*)sv) |= CVf_METHOD;
continue;
}
break;
}
break;
}
break;
default:
switch ((int)len) {
case 6:
switch (*name) {
case 's':
if (strEQ(name, "shared")) {
if (negated)
Perl_croak(aTHX_ "A variable may not be unshared");
SvSHARE(sv);
continue;
}
break;
case 'u':
if (strEQ(name, "unique")) {
if (SvTYPE(sv) == SVt_PVGV) {
if (negated)
GvUNIQUE_off(sv);
else
GvUNIQUE_on(sv);
}
/* Hope this came from toke.c if not a GV. */
continue;
}
}
}
break;
}
/* anything recognized had a 'continue' above */
*retlist++ = attr;
nret++;
}
return nret;
}
/* package attributes; */
XS(XS_attributes_bootstrap)
{
dXSARGS;
char *file = __FILE__;
if( items > 1 )
Perl_croak(aTHX_ "Usage: attributes::bootstrap $module");
newXSproto("attributes::_warn_reserved", XS_attributes__warn_reserved, file, "");
newXS("attributes::_modify_attrs", XS_attributes__modify_attrs, file);
newXSproto("attributes::_guess_stash", XS_attributes__guess_stash, file, "$");
newXSproto("attributes::_fetch_attrs", XS_attributes__fetch_attrs, file, "$");
newXSproto("attributes::reftype", XS_attributes_reftype, file, "$");
XSRETURN(0);
}
XS(XS_attributes__modify_attrs)
{
dXSARGS;
SV *rv, *sv;
if (items < 1) {
usage:
Perl_croak(aTHX_
"Usage: attributes::_modify_attrs $reference, @attributes");
}
rv = ST(0);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
if (items > 1)
XSRETURN(modify_SV_attributes(aTHX_ sv, &ST(0), &ST(1), items-1));
XSRETURN(0);
}
XS(XS_attributes__fetch_attrs)
{
dXSARGS;
SV *rv, *sv;
cv_flags_t cvflags;
if (items != 1) {
usage:
Perl_croak(aTHX_
"Usage: attributes::_fetch_attrs $reference");
}
rv = ST(0);
SP -= items;
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
switch (SvTYPE(sv)) {
case SVt_PVCV:
cvflags = CvFLAGS((CV*)sv);
if (cvflags & CVf_LOCKED)
XPUSHs(sv_2mortal(newSVpvn("locked", 6)));
#ifdef CVf_LVALUE
if (cvflags & CVf_LVALUE)
XPUSHs(sv_2mortal(newSVpvn("lvalue", 6)));
#endif
if (cvflags & CVf_METHOD)
XPUSHs(sv_2mortal(newSVpvn("method", 6)));
if (GvUNIQUE(CvGV((CV*)sv)))
XPUSHs(sv_2mortal(newSVpvn("unique", 6)));
break;
case SVt_PVGV:
if (GvUNIQUE(sv))
XPUSHs(sv_2mortal(newSVpvn("unique", 6)));
break;
default:
break;
}
PUTBACK;
}
XS(XS_attributes__guess_stash)
{
dXSARGS;
SV *rv, *sv;
#ifdef dXSTARGET
dXSTARGET;
#else
SV * TARG = sv_newmortal();
#endif
if (items != 1) {
usage:
Perl_croak(aTHX_
"Usage: attributes::_guess_stash $reference");
}
rv = ST(0);
ST(0) = TARG;
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
if (SvOBJECT(sv))
sv_setpv(TARG, HvNAME(SvSTASH(sv)));
#if 0 /* this was probably a bad idea */
else if (SvPADMY(sv))
sv_setsv(TARG, &PL_sv_no); /* unblessed lexical */
#endif
else {
HV *stash = Nullhv;
switch (SvTYPE(sv)) {
case SVt_PVCV:
if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv)))
stash = GvSTASH(CvGV(sv));
else if (/* !CvANON(sv) && */ CvSTASH(sv))
stash = CvSTASH(sv);
break;
case SVt_PVMG:
if (!(SvFAKE(sv) && SvTIED_mg(sv, PERL_MAGIC_glob)))
break;
/*FALLTHROUGH*/
case SVt_PVGV:
if (GvGP(sv) && GvESTASH((GV*)sv))
stash = GvESTASH((GV*)sv);
break;
default:
break;
}
if (stash)
sv_setpv(TARG, HvNAME(stash));
}
#ifdef dXSTARGET
SvSETMAGIC(TARG);
#endif
XSRETURN(1);
}
XS(XS_attributes_reftype)
{
dXSARGS;
SV *rv, *sv;
#ifdef dXSTARGET
dXSTARGET;
#else
SV * TARG = sv_newmortal();
#endif
if (items != 1) {
usage:
Perl_croak(aTHX_
"Usage: attributes::reftype $reference");
}
rv = ST(0);
ST(0) = TARG;
if (SvGMAGICAL(rv))
mg_get(rv);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
sv_setpv(TARG, sv_reftype(sv, 0));
#ifdef dXSTARGET
SvSETMAGIC(TARG);
#endif
XSRETURN(1);
}
XS(XS_attributes__warn_reserved)
{
dXSARGS;
#ifdef dXSTARGET
dXSTARGET;
#else
SV * TARG = sv_newmortal();
#endif
if (items != 0) {
Perl_croak(aTHX_
"Usage: attributes::_warn_reserved ()");
}
EXTEND(SP,1);
ST(0) = TARG;
sv_setiv(TARG, ckWARN(WARN_RESERVED) != 0);
#ifdef dXSTARGET
SvSETMAGIC(TARG);
#endif
XSRETURN(1);
}