Stowage/cpython
2
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2026-01-03 22:12:27 +00:00
Code Issues Projects Releases Packages Wiki Activity

gh-135228: Create __dict__ and __weakref__ descriptors for object (GH-136966)

Browse source 
This partially reverts #137047, keeping the tests for GC collectability of the
original class that dataclass adds `__slots__` to.
The reference leaks solved there are instead solved by having the `__dict__` &
`__weakref__` descriptors not tied to (and referencing) their class.

Instead, they're shared between all classes that need them (within
an interpreter).
The `__objclass__` ol the descriptors is set to `object`, since these
descriptors work with *any* object. (The appropriate checks were already
made in the get/set code, so the `__objclass__` check was redundant.)

The repr of these descriptors (and any others whose `__objclass__` is `object`)
now doesn't mention the objclass.

This change required adjustment of introspection code that checks
`__objclass__` to determine an object's “own” (i.e. not inherited) `__dict__`.
Third-party code that does similar introspection of the internals will also
need adjusting.


Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
This commit is contained in:
Petr Viktorin 2025-08-18 14:25:51 +02:00 • committed by GitHub
parent 92be979f64
commit 7dfa048bbb
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
13 changed files with 171 additions and 120 deletions
Download patch file Download diff file Expand all files Collapse all files

41
Python/sysmodule.c
View file

@ -2644,46 +2644,6 @@ sys__baserepl_impl(PyObject *module)
Py_RETURN_NONE;
}
/*[clinic input]
sys._clear_type_descriptors
type: object(subclass_of='&PyType_Type')
/
Private function for clearing certain descriptors from a type's dictionary.
See gh-135228 for context.
[clinic start generated code]*/
static PyObject *
sys__clear_type_descriptors_impl(PyObject *module, PyObject *type)
/*[clinic end generated code: output=5ad17851b762b6d9 input=dc536c97fde07251]*/
{
PyTypeObject *typeobj = (PyTypeObject *)type;
if (_PyType_HasFeature(typeobj, Py_TPFLAGS_IMMUTABLETYPE)) {
PyErr_SetString(PyExc_TypeError, "argument is immutable");
return NULL;
}
PyObject *dict = _PyType_GetDict(typeobj);
PyObject *dunder_dict = NULL;
if (PyDict_Pop(dict, &_Py_ID(__dict__), &dunder_dict) < 0) {
return NULL;
}
PyObject *dunder_weakref = NULL;
if (PyDict_Pop(dict, &_Py_ID(__weakref__), &dunder_weakref) < 0) {
PyType_Modified(typeobj);
Py_XDECREF(dunder_dict);
return NULL;
}
PyType_Modified(typeobj);
// We try to hold onto a reference to these until after we call
// PyType_Modified(), in case their deallocation triggers somer user code
// that tries to do something to the type.
Py_XDECREF(dunder_dict);
Py_XDECREF(dunder_weakref);
Py_RETURN_NONE;
}
/*[clinic input]
sys._is_gil_enabled -> bool
@ -2881,7 +2841,6 @@ static PyMethodDef sys_methods[] = {
SYS__STATS_DUMP_METHODDEF
#endif
SYS__GET_CPU_COUNT_CONFIG_METHODDEF
SYS__CLEAR_TYPE_DESCRIPTORS_METHODDEF
SYS__IS_GIL_ENABLED_METHODDEF
SYS__DUMP_TRACELETS_METHODDEF
{NULL, NULL} // sentinel