Checkpoint LOAD_ATTR_GETATTRIBUTE_OVERRIDEN

Author: mpage

Python/bytecodes.c

@@ -2337,7 +2337,7 @@ dummy_func(
             DEOPT_IF(tstate->interp->eval_frame);
             PyTypeObject *cls = Py_TYPE(owner_o);
             assert(type_version != 0);
-            DEOPT_IF(cls->tp_version_tag != type_version);
+            DEOPT_IF(FT_ATOMIC_LOAD_UINT32_RELAXED(cls->tp_version_tag) != type_version);
             assert(Py_IS_TYPE(getattribute, &PyFunction_Type));
             PyFunctionObject *f = (PyFunctionObject *)getattribute;
             assert(func_version != 0);

Python/generated_cases.c.h

@@ -1252,7 +1252,6 @@ do_specialize_instance_load_attr(PyObject* owner, _Py_CODEUNIT* instr, PyObject*
         {
             assert(type->tp_getattro == _Py_slot_tp_getattro);
             assert(Py_IS_TYPE(descr, &PyFunction_Type));
-            FT_UNIMPLEMENTED();
             _PyLoadMethodCache *lm_cache = (_PyLoadMethodCache *)(instr + 1);
             if (!function_check_args(descr, 2, LOAD_ATTR)) {
                 return -1;
@@ -1269,10 +1268,16 @@ do_specialize_instance_load_attr(PyObject* owner, _Py_CODEUNIT* instr, PyObject*
                 SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OTHER);
                 return -1;
             }
+            #ifdef Py_GIL_DISABLED
+            if (!_PyObject_HasDeferredRefcount(descr)) {
+                SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_DESCR_NOT_DEFERRED);
+                return -1;
+            }
+            #endif
             write_u32(lm_cache->keys_version, version);
             /* borrowed */
             write_obj(lm_cache->descr, descr);
-            write_u32(lm_cache->type_version, type->tp_version_tag);
+            write_u32(lm_cache->type_version, tp_version);
             specialize(instr, LOAD_ATTR_GETATTRIBUTE_OVERRIDDEN);
             return 0;
         }