sub : attrlist

To: Mailing list Perl5 <perl5-porters@perl.org>
Message-Id: <199908290702.DAA32191@Orb.Nashua.NH.US>

p4raw-id: //depot/cfgperl@4043

1 files changed, 298 insertions, 0 deletions

diff --git a/xsutils.c b/xsutils.c
new file mode 100644
index 0000000000..14f9d0f185
--- /dev/null
+++ b/xsutils.c
@@ -0,0 +1,298 @@
+#include "EXTERN.h"
+#define PERL_IN_XSUTILS_C
+#include "perl.h"
+
+/*
+ * Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us).
+ */
+
+STATIC int
+S_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:
+	    /* nothing, yet */
+	    break;
+	}
+	/* anything recognized had a 'continue' above */
+	*retlist++ = attr;
+	nret++;
+    }
+
+    return nret;
+}
+
+
+/* package attributes; */
+void XS_attributes__warn_reserved(pTHXo_ CV *cv);
+void XS_attributes_reftype(pTHXo_ CV *cv);
+void XS_attributes__modify_attrs(pTHXo_ CV *cv);
+void XS_attributes__guess_stash(pTHXo_ CV *cv);
+void XS_attributes__fetch_attrs(pTHXo_ CV *cv);
+void XS_attributes_bootstrap(pTHXo_ CV *cv);
+
+
+/*
+ * Note that only ${pkg}::bootstrap definitions should go here.
+ * This helps keep down the start-up time, which is especially
+ * relevant for users who don't invoke any features which are
+ * (partially) implemented here.
+ *
+ * The various bootstrap definitions can take care of doing
+ * package-specific newXS() calls.  Since the layout of the
+ * bundled lib/*.pm files is in a version-specific directory,
+ * version checks in these bootstrap calls are optional.
+ */
+
+void
+Perl_boot_core_xsutils(pTHX)
+{
+    char *file = __FILE__;
+
+    newXS("attributes::bootstrap",	XS_attributes_bootstrap,	file);
+}
+
+#ifdef PERL_OBJECT
+#define NO_XSLOCKS
+#endif  /* PERL_OBJECT */
+
+#include "XSUB.h"
+
+/* package attributes; */
+
+XS(XS_attributes_bootstrap)
+{
+    dXSARGS;
+    char *file = __FILE__;
+
+    newXSproto("attributes::_warn_reserved", XS_attributes__warn_reserved, file, "");
+    newXS("attributes::_modify_attrs",	XS_attributes__modify_attrs,	file);
+    newXSproto("attributes::_guess_stash", XS_attributes__guess_stash, file, "$");
+    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(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)));
+	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)) &&
+			    HvNAME(GvSTASH(CvGV(sv))))
+		stash = GvSTASH(CvGV(sv));
+	    else if (/* !CvANON(sv) && */ CvSTASH(sv) && HvNAME(CvSTASH(sv)))
+		stash = CvSTASH(sv);
+	    break;
+	case SVt_PVMG:
+	    if (!(SvFAKE(sv) && SvTIED_mg(sv, '*')))
+		break;
+	    /*FALLTHROUGH*/
+	case SVt_PVGV:
+	    if (GvGP(sv) && GvESTASH((GV*)sv) && HvNAME(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 (!SvOK(rv)) {
+	ST(0) = &PL_sv_no;
+	XSRETURN(1);
+    }
+    if (!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;
+    SV *rv, *sv;
+#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);
+}
+