+ return z;
+}
+
+#endif /* XSH_THREADSAFE */
+
+#define vmg_wizard_id(W) PTR2IV(vmg_vtable_vtbl((W)->vtable))
+
+/* --- Wizard SV objects --------------------------------------------------- */
+
+static int vmg_wizard_sv_free(pTHX_ SV *sv, MAGIC *mg) {
+ vmg_wizard_free((vmg_wizard *) mg->mg_ptr);
+
+ return 0;
+}
+
+#if XSH_THREADSAFE
+
+static int vmg_wizard_sv_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *params) {
+ mg->mg_ptr = (char *) vmg_wizard_dup((const vmg_wizard *) mg->mg_ptr, params);
+
+ return 0;
+}
+
+#endif /* XSH_THREADSAFE */
+
+static MGVTBL vmg_wizard_sv_vtbl = {
+ NULL, /* get */
+ NULL, /* set */
+ NULL, /* len */
+ NULL, /* clear */
+ vmg_wizard_sv_free, /* free */
+ NULL, /* copy */
+#if XSH_THREADSAFE
+ vmg_wizard_sv_dup, /* dup */
+#else
+ NULL, /* dup */
+#endif
+#if MGf_LOCAL
+ NULL, /* local */
+#endif /* MGf_LOCAL */
+};
+
+static SV *vmg_wizard_sv_new(pTHX_ const vmg_wizard *w) {
+#define vmg_wizard_sv_new(W) vmg_wizard_sv_new(aTHX_ (W))
+ SV *wiz;
+
+#if XSH_THREADSAFE
+ wiz = newSV(0);
+#else
+ wiz = newSViv(PTR2IV(w));
+#endif
+
+ vmg_sv_magicext(wiz, NULL, &vmg_wizard_sv_vtbl, w, 0);
+
+ SvREADONLY_on(wiz);
+
+ return wiz;
+}
+
+#if XSH_THREADSAFE
+
+#define vmg_sv_has_wizard_type(S) (SvTYPE(S) >= SVt_PVMG)
+
+static const vmg_wizard *vmg_wizard_from_sv_nocheck(const SV *wiz) {
+ MAGIC *mg;
+
+ for (mg = SvMAGIC(wiz); mg; mg = mg->mg_moremagic) {
+ if (mg->mg_type == PERL_MAGIC_ext && mg->mg_virtual == &vmg_wizard_sv_vtbl)
+ return (const vmg_wizard *) mg->mg_ptr;
+ }
+
+ return NULL;
+}
+
+#else /* XSH_THREADSAFE */
+
+#define vmg_sv_has_wizard_type(S) SvIOK(S)
+
+#define vmg_wizard_from_sv_nocheck(W) INT2PTR(const vmg_wizard *, SvIVX(W))
+
+#endif /* !XSH_THREADSAFE */
+
+#define vmg_wizard_from_sv(W) (vmg_sv_has_wizard_type(W) ? vmg_wizard_from_sv_nocheck(W) : NULL)
+
+static const vmg_wizard *vmg_wizard_from_mg(const MAGIC *mg) {
+ if (mg->mg_type == PERL_MAGIC_ext && mg->mg_len == HEf_SVKEY) {
+ SV *sv = (SV *) mg->mg_ptr;
+
+ if (vmg_sv_has_wizard_type(sv))
+ return vmg_wizard_from_sv_nocheck(sv);
+ }
+
+ return NULL;
+}
+
+#define vmg_wizard_from_mg_nocheck(M) vmg_wizard_from_sv_nocheck((const SV *) (M)->mg_ptr)
+
+/* --- User-level functions implementation --------------------------------- */
+
+static const MAGIC *vmg_find(const SV *sv, const vmg_wizard *w) {
+ const MAGIC *mg;
+ IV wid;
+
+ if (SvTYPE(sv) < SVt_PVMG)
+ return NULL;
+
+ wid = vmg_wizard_id(w);
+
+ for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
+ const vmg_wizard *z = vmg_wizard_from_mg(mg);
+
+ if (z && vmg_wizard_id(z) == wid)
+ return mg;
+ }
+
+ return NULL;
+}