Make tp_subclasses void*.

Author: ericsnowcurrently

Doc/c-api/typeobj.rst

@@ -135,7 +135,7 @@ Quick Reference
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
    | [:c:member:`~PyTypeObject.tp_cache`]           | :c:type:`PyObject` *              |                   |   |   |       |
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
-   | [:c:member:`~PyTypeObject.tp_subclasses`]      | :c:type:`PyObject` *              | __subclasses__    |   |   |       |
+   | [:c:member:`~PyTypeObject.tp_subclasses`]      | void *                            | __subclasses__    |   |   |       |
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
    | [:c:member:`~PyTypeObject.tp_weaklist`]        | :c:type:`PyObject` *              |                   |   |   |       |
    +------------------------------------------------+-----------------------------------+-------------------+---+---+---+---+
@@ -1936,8 +1936,8 @@ and :c:type:`PyType_Type` effectively act as defaults.)
 
       Internals detail: For the static builtin types this field no longer
       holds the subclasses.  Those are now stored on ``PyInterpreterState``.
-      This field is re-purposed to hold the index into the type's storage
-      on each interpreter state.
+      For static builtin types, this field is re-purposed to hold the index
+      into the type's storage on each interpreter state.
 
    **Inheritance:**
 

Include/cpython/object.h

@@ -218,7 +218,7 @@ struct _typeobject {
     PyObject *tp_bases;
     PyObject *tp_mro; /* method resolution order */
     PyObject *tp_cache; /* no longer used */
-    PyObject *tp_subclasses;  /* for static builtin types this is an index */
+    void *tp_subclasses;  /* for static builtin types this is an index */
     PyObject *tp_weaklist;
     destructor tp_del;
 

Objects/typeobject.c

@@ -4427,7 +4427,7 @@ lookup_subclasses(PyTypeObject *self)
         assert(state != NULL);
         return state->tp_subclasses;
     }
-    return self->tp_subclasses;
+    return (PyObject *)self->tp_subclasses;
 }
 
 int
@@ -6844,7 +6844,7 @@ init_subclasses(PyTypeObject *self)
         state->tp_subclasses = subclasses;
         return subclasses;
     }
-    self->tp_subclasses = subclasses;
+    self->tp_subclasses = (void *)subclasses;
     return subclasses;
 }