/* xsutils.c
*
* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
* 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
*
* [p.597 of _The Lord of the Rings_, III/xi: "The PalantÃr"]
*/
#include "EXTERN.h"
#define PERL_IN_XSUTILS_C
#include "perl.h"
/*
* Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us).
*/
/* package attributes; */
PERL_XS_EXPORT_C void XS_attributes_reftype(pTHX_ CV *cv);
PERL_XS_EXPORT_C void XS_attributes__modify_attrs(pTHX_ CV *cv);
PERL_XS_EXPORT_C void XS_attributes__guess_stash(pTHX_ CV *cv);
PERL_XS_EXPORT_C void XS_attributes__fetch_attrs(pTHX_ CV *cv);
PERL_XS_EXPORT_C 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.
*/
static const char file[] = __FILE__;
void
Perl_boot_core_xsutils(pTHX)
{
newXS("attributes::bootstrap", XS_attributes_bootstrap, file);
}
#include "XSUB.h"
static int
modify_SV_attributes(pTHX_ SV *sv, SV **retlist, SV **attrlist, int numattrs)
{
dVAR;
SV *attr;
int nret;
for (nret = 0 ; numattrs && (attr = *attrlist++); numattrs--) {
STRLEN len;
const char *name = SvPV_const(attr, len);
const bool negated = (*name == '-');
if (negated) {
name++;
len--;
}
switch (SvTYPE(sv)) {
case SVt_PVCV:
switch ((int)len) {
case 6:
switch (name[3]) {
case 'l':
if (memEQ(name, "lvalue", 6)) {
if (negated)
CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_LVALUE;
else
CvFLAGS(MUTABLE_CV(sv)) |= CVf_LVALUE;
continue;
}
break;
case 'k':
if (memEQ(name, "locked", 6)) {
if (negated)
CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_LOCKED;
else
CvFLAGS(MUTABLE_CV(sv)) |= CVf_LOCKED;
continue;
}
break;
case 'h':
if (memEQ(name, "method", 6)) {
if (negated)
CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_METHOD;
else
CvFLAGS(MUTABLE_CV(sv)) |= CVf_METHOD;
continue;
}
break;
}
break;
}
break;
default:
switch ((int)len) {
case 6:
switch (name[5]) {
case 'd':
if (memEQ(name, "share", 5)) {
if (negated)
Perl_croak(aTHX_ "A variable may not be unshared");
SvSHARE(sv);
continue;
}
break;
case 'e':
if (memEQ(name, "uniqu", 5)) {
if (isGV_with_GP(sv)) {
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)
{
dVAR;
dXSARGS;
if( items > 1 )
croak_xs_usage(cv, "$module");
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, "$");
XSRETURN(0);
}
XS(XS_attributes__modify_attrs)
{
dVAR;
dXSARGS;
SV *rv, *sv;
if (items < 1) {
usage:
croak_xs_usage(cv, "@attributes");
}
rv = ST(0);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
if (items > 1)
XSRETURN(modify_SV_attributes(aTHX_ sv, &ST(0), &ST(1), items-1));
XSRETURN(0);
}
XS(XS_attributes__fetch_attrs)
{
dVAR;
dXSARGS;
SV *rv, *sv;
cv_flags_t cvflags;
if (items != 1) {
usage:
croak_xs_usage(cv, "$reference");
}
rv = ST(0);
SP -= items;
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
switch (SvTYPE(sv)) {
case SVt_PVCV:
cvflags = CvFLAGS((const CV *)sv);
if (cvflags & CVf_LOCKED)
XPUSHs(newSVpvs_flags("locked", SVs_TEMP));
if (cvflags & CVf_LVALUE)
XPUSHs(newSVpvs_flags("lvalue", SVs_TEMP));
if (cvflags & CVf_METHOD)
XPUSHs(newSVpvs_flags("method", SVs_TEMP));
if (GvUNIQUE(CvGV((const CV *)sv)))
XPUSHs(newSVpvs_flags("unique", SVs_TEMP));
break;
case SVt_PVGV:
if (isGV_with_GP(sv) && GvUNIQUE(sv))
XPUSHs(newSVpvs_flags("unique", SVs_TEMP));
break;
default:
break;
}
PUTBACK;
}
XS(XS_attributes__guess_stash)
{
dVAR;
dXSARGS;
SV *rv, *sv;
dXSTARG;
if (items != 1) {
usage:
croak_xs_usage(cv, "$reference");
}
rv = ST(0);
ST(0) = TARG;
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
if (SvOBJECT(sv))
sv_setpvn(TARG, HvNAME_get(SvSTASH(sv)), HvNAMELEN_get(SvSTASH(sv)));
#if 0 /* this was probably a bad idea */
else if (SvPADMY(sv))
sv_setsv(TARG, &PL_sv_no); /* unblessed lexical */
#endif
else {
const HV *stash = NULL;
switch (SvTYPE(sv)) {
case SVt_PVCV:
if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv)))
stash = GvSTASH(CvGV(sv));
else if (/* !CvANON(sv) && */ CvSTASH(sv))
stash = CvSTASH(sv);
break;
case SVt_PVGV:
if (isGV_with_GP(sv) && GvGP(sv) && GvESTASH(MUTABLE_GV(sv)))
stash = GvESTASH(MUTABLE_GV(sv));
break;
default:
break;
}
if (stash)
sv_setpvn(TARG, HvNAME_get(stash), HvNAMELEN_get(stash));
}
SvSETMAGIC(TARG);
XSRETURN(1);
}
XS(XS_attributes_reftype)
{
dVAR;
dXSARGS;
SV *rv, *sv;
dXSTARG;
if (items != 1) {
usage:
croak_xs_usage(cv, "$reference");
}
rv = ST(0);
ST(0) = TARG;
SvGETMAGIC(rv);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
sv_setpv(TARG, sv_reftype(sv, 0));
SvSETMAGIC(TARG);
XSRETURN(1);
}
/*
* Local variables:
* c-indentation-style: bsd
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*
* ex: set ts=8 sts=4 sw=4 noet:
*/