py/objtype: Added alternate no-mutate __set_name__ for descriptor use.

AJMansfield · AJMansfield · commit 03b37bd2e860 · 2025-07-20T11:53:23.000-04:00
Signed-off-by: Anson Mansfield &lt;amansfield@mantaro.com&gt;
diff --git a/py/objtype.c b/py/objtype.c
@@ -1308,6 +1308,23 @@ mp_obj_t mp_obj_new_type(qstr name, mp_obj_t bases_tuple, mp_obj_t locals_dict)
 
     #if MICROPY_PY_METACLASSES_LITE
     setname_consume_call_all(setname_list, MP_OBJ_FROM_PTR(o));
+    #elif MICROPY_PY_DESCRIPTORS
+    locals_map->is_fixed = 1; // just block modify-while-write of __set_name__
+    // call __set_name__ on all entries (especially descriptors)
+    for (size_t i = 0; i < locals_map->alloc; i++) {
+        if (mp_map_slot_is_filled(locals_map, i)) {
+            elem = &(locals_map->table[i]);
+
+            mp_obj_t set_name_method[4];
+            mp_load_method_maybe(elem->value, MP_QSTR___set_name__, set_name_method);
+            if (set_name_method[1] != MP_OBJ_NULL) {
+                set_name_method[2] = MP_OBJ_FROM_PTR(o);
+                set_name_method[3] = elem->key;
+                mp_call_method_n_kw(2, 0, set_name_method);
+            }
+        }
+    }
+    locals_map->is_fixed = 0; // would be finalizer, but class isn't returned anyway
     #endif
 
     return MP_OBJ_FROM_PTR(o);
