Fix for SF bug #642358: only provide a new with a __dict__ or
__weaklist__ descriptor if we added __dict__ or __weaklist__,
respectively. With unit test.
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index 2de5395..e88f5f5 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -1353,9 +1353,9 @@
return result;
}
-static PyGetSetDef subtype_getsets[] = {
- /* Not all objects have these attributes!
- The descriptor's __get__ method may raise AttributeError. */
+/* Three variants on the subtype_getsets list. */
+
+static PyGetSetDef subtype_getsets_full[] = {
{"__dict__", subtype_dict, subtype_setdict,
PyDoc_STR("dictionary for instance variables (if defined)")},
{"__weakref__", subtype_getweakref, NULL,
@@ -1363,6 +1363,18 @@
{0}
};
+static PyGetSetDef subtype_getsets_dict_only[] = {
+ {"__dict__", subtype_dict, subtype_setdict,
+ PyDoc_STR("dictionary for instance variables (if defined)")},
+ {0}
+};
+
+static PyGetSetDef subtype_getsets_weakref_only[] = {
+ {"__weakref__", subtype_getweakref, NULL,
+ PyDoc_STR("list of weak references to the object (if defined)")},
+ {0}
+};
+
/* bozo: __getstate__ that raises TypeError */
static PyObject *
@@ -1810,7 +1822,15 @@
type->tp_basicsize = slotoffset;
type->tp_itemsize = base->tp_itemsize;
type->tp_members = et->members;
- type->tp_getset = subtype_getsets;
+
+ if (type->tp_weaklistoffset && type->tp_dictoffset)
+ type->tp_getset = subtype_getsets_full;
+ else if (type->tp_weaklistoffset && !type->tp_dictoffset)
+ type->tp_getset = subtype_getsets_weakref_only;
+ else if (!type->tp_weaklistoffset && type->tp_dictoffset)
+ type->tp_getset = subtype_getsets_dict_only;
+ else
+ type->tp_getset = NULL;
/* Special case some slots */
if (type->tp_dictoffset != 0 || nslots > 0) {