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bpo-46417: Add _PyType_GetSubclasses() function (GH-30761)

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Add a new _PyType_GetSubclasses() function to get type's subclasses.

_PyType_GetSubclasses(type) returns a list which holds strong
refererences to subclasses. It is safer than iterating on
type->tp_subclasses which yields weak references and can be modified
in the loop.

_PyType_GetSubclasses(type) now holds a reference to the tp_subclasses
dict while creating the list of subclasses.

set_collection_flag_recursive() of _abc.c now uses
_PyType_GetSubclasses().
This commit is contained in:
Victor Stinner 2022-01-21 23:29:10 +01:00 • committed by GitHub
parent 57d1855682
commit 8ee07dda13
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3 changed files with 75 additions and 54 deletions
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11
Include/internal/pycore_object.h
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@ -220,11 +220,12 @@ static inline PyObject **_PyObject_ManagedDictPointer(PyObject *obj)
return ((PyObject **)obj)-3;
}
PyObject ** _PyObject_DictPointer(PyObject *);
int _PyObject_VisitInstanceAttributes(PyObject *self, visitproc visit, void *arg);
void _PyObject_ClearInstanceAttributes(PyObject *self);
void _PyObject_FreeInstanceAttributes(PyObject *self);
int _PyObject_IsInstanceDictEmpty(PyObject *);
extern PyObject ** _PyObject_DictPointer(PyObject *);
extern int _PyObject_VisitInstanceAttributes(PyObject *self, visitproc visit, void *arg);
extern void _PyObject_ClearInstanceAttributes(PyObject *self);
extern void _PyObject_FreeInstanceAttributes(PyObject *self);
extern int _PyObject_IsInstanceDictEmpty(PyObject *);
extern PyObject* _PyType_GetSubclasses(PyTypeObject *);
#ifdef __cplusplus
}