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bpo-46417: Finalize structseq types at exit (GH-30645)

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Add _PyStructSequence_FiniType() and _PyStaticType_Dealloc()
functions to finalize a structseq static type in Py_Finalize().
Currrently, these functions do nothing if Python is built in release
mode.

Clear static types:

* AsyncGenHooksType: sys.set_asyncgen_hooks()
* FlagsType: sys.flags
* FloatInfoType: sys.float_info
* Hash_InfoType: sys.hash_info
* Int_InfoType: sys.int_info
* ThreadInfoType: sys.thread_info
* UnraisableHookArgsType: sys.unraisablehook
* VersionInfoType: sys.version
* WindowsVersionType: sys.getwindowsversion()
This commit is contained in:
Victor Stinner 2022-01-21 01:42:25 +01:00 • committed by GitHub
parent 27df7566bc
commit e9e3eab0b8
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GPG key ID: 4AEE18F83AFDEB23
17 changed files with 230 additions and 2 deletions
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23
Objects/typeobject.c
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@ -4070,10 +4070,27 @@ type_setattro(PyTypeObject *type, PyObject *name, PyObject *value)
extern void
_PyDictKeys_DecRef(PyDictKeysObject *keys);
void
_PyStaticType_Dealloc(PyTypeObject *type)
{
// _PyStaticType_Dealloc() must not be called if a type has subtypes.
// A subtype can inherit attributes and methods of its parent type,
// and a type must no longer be used once it's deallocated.
assert(type->tp_subclasses == NULL);
Py_CLEAR(type->tp_dict);
Py_CLEAR(type->tp_bases);
Py_CLEAR(type->tp_mro);
Py_CLEAR(type->tp_cache);
Py_CLEAR(type->tp_subclasses);
type->tp_flags &= ~Py_TPFLAGS_READY;
}
static void
type_dealloc(PyTypeObject *type)
{
PyHeapTypeObject *et;
PyObject *tp, *val, *tb;
/* Assert this is a heap-allocated type object */
@ -4082,8 +4099,8 @@ type_dealloc(PyTypeObject *type)
PyErr_Fetch(&tp, &val, &tb);
remove_all_subclasses(type, type->tp_bases);
PyErr_Restore(tp, val, tb);
PyObject_ClearWeakRefs((PyObject *)type);
et = (PyHeapTypeObject *)type;
Py_XDECREF(type->tp_base);
Py_XDECREF(type->tp_dict);
Py_XDECREF(type->tp_bases);
@ -4094,6 +4111,8 @@ type_dealloc(PyTypeObject *type)
* of most other objects. It's okay to cast it to char *.
*/
PyObject_Free((char *)type->tp_doc);
PyHeapTypeObject *et = (PyHeapTypeObject *)type;
Py_XDECREF(et->ht_name);
Py_XDECREF(et->ht_qualname);
Py_XDECREF(et->ht_slots);