Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly
Appearance settings

bpo-46417: Py_Finalize() clears static types #30743

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Jan 21, 2022
Merged

bpo-46417: Py_Finalize() clears static types #30743

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions 1 Include/internal/pycore_typeobject.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@ extern "C" {

extern PyStatus _PyTypes_InitState(PyInterpreterState *);
extern PyStatus _PyTypes_InitTypes(PyInterpreterState *);
extern void _PyTypes_FiniTypes(PyInterpreterState *);
extern void _PyTypes_Fini(PyInterpreterState *);


Expand Down
199 changes: 120 additions & 79 deletions 199 Objects/object.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1837,6 +1837,94 @@ _PyTypes_InitState(PyInterpreterState *interp)
return _PyStatus_OK();
}


static PyTypeObject* static_types[] = {
// base types
&PyAsyncGen_Type,
&PyBool_Type,
&PyByteArrayIter_Type,
&PyByteArray_Type,
&PyCFunction_Type,
&PyCallIter_Type,
&PyCapsule_Type,
&PyCell_Type,
&PyClassMethodDescr_Type,
&PyClassMethod_Type,
&PyCode_Type,
&PyComplex_Type,
&PyCoro_Type,
&PyDictItems_Type,
&PyDictIterItem_Type,
&PyDictIterKey_Type,
&PyDictIterValue_Type,
&PyDictKeys_Type,
&PyDictProxy_Type,
&PyDictRevIterItem_Type,
&PyDictRevIterKey_Type,
&PyDictRevIterValue_Type,
&PyDictValues_Type,
&PyDict_Type,
&PyEllipsis_Type,
&PyEnum_Type,
&PyFrame_Type,
&PyFrozenSet_Type,
&PyFunction_Type,
&PyGen_Type,
&PyGetSetDescr_Type,
&PyInstanceMethod_Type,
&PyListIter_Type,
&PyListRevIter_Type,
&PyList_Type,
&PyLongRangeIter_Type,
&PyMemberDescr_Type,
&PyMemoryView_Type,
&PyMethodDescr_Type,
&PyMethod_Type,
&PyModuleDef_Type,
&PyModule_Type,
&PyODictIter_Type,
&PyPickleBuffer_Type,
&PyProperty_Type,
&PyRangeIter_Type,
&PyRange_Type,
&PyReversed_Type,
&PySTEntry_Type,
&PySeqIter_Type,
&PySetIter_Type,
&PySet_Type,
&PySlice_Type,
&PyStaticMethod_Type,
&PyStdPrinter_Type,
&PySuper_Type,
&PyTraceBack_Type,
&PyWrapperDescr_Type,
&Py_GenericAliasType,
&_PyAnextAwaitable_Type,
&_PyAsyncGenASend_Type,
&_PyAsyncGenAThrow_Type,
&_PyAsyncGenWrappedValue_Type,
&_PyCoroWrapper_Type,
&_PyInterpreterID_Type,
&_PyManagedBuffer_Type,
&_PyMethodWrapper_Type,
&_PyNamespace_Type,
&_PyNone_Type,
&_PyNotImplemented_Type,
&_PyUnion_Type,
&_PyWeakref_CallableProxyType,
&_PyWeakref_ProxyType,
&_PyWeakref_RefType,

// subclasses: _PyTypes_FiniTypes() deallocates them before their base
// class
&PyCMethod_Type, // base=&PyCFunction_Type
&PyODictItems_Type, // base=&PyDictItems_Type
&PyODictKeys_Type, // base=&PyDictKeys_Type
&PyODictValues_Type, // base=&PyDictValues_Type
&PyODict_Type, // base=&PyDict_Type
};


PyStatus
_PyTypes_InitTypes(PyInterpreterState *interp)
{
Expand All @@ -1858,91 +1946,44 @@ _PyTypes_InitTypes(PyInterpreterState *interp)
assert(PyType_Type.tp_base == &PyBaseObject_Type);

// All other static types (unless initialized elsewhere)
INIT_TYPE(PyAsyncGen_Type);
INIT_TYPE(PyBool_Type);
INIT_TYPE(PyByteArrayIter_Type);
INIT_TYPE(PyByteArray_Type);
INIT_TYPE(PyCFunction_Type);
INIT_TYPE(PyCMethod_Type);
INIT_TYPE(PyCallIter_Type);
INIT_TYPE(PyCapsule_Type);
INIT_TYPE(PyCell_Type);
INIT_TYPE(PyClassMethodDescr_Type);
INIT_TYPE(PyClassMethod_Type);
INIT_TYPE(PyCode_Type);
INIT_TYPE(PyComplex_Type);
INIT_TYPE(PyCoro_Type);
INIT_TYPE(PyDictItems_Type);
INIT_TYPE(PyDictIterItem_Type);
INIT_TYPE(PyDictIterKey_Type);
INIT_TYPE(PyDictIterValue_Type);
INIT_TYPE(PyDictKeys_Type);
INIT_TYPE(PyDictProxy_Type);
INIT_TYPE(PyDictRevIterItem_Type);
INIT_TYPE(PyDictRevIterKey_Type);
INIT_TYPE(PyDictRevIterValue_Type);
INIT_TYPE(PyDictValues_Type);
INIT_TYPE(PyDict_Type);
INIT_TYPE(PyEllipsis_Type);
INIT_TYPE(PyEnum_Type);
INIT_TYPE(PyFrame_Type);
INIT_TYPE(PyFrozenSet_Type);
INIT_TYPE(PyFunction_Type);
INIT_TYPE(PyGen_Type);
INIT_TYPE(PyGetSetDescr_Type);
INIT_TYPE(PyInstanceMethod_Type);
INIT_TYPE(PyListIter_Type);
INIT_TYPE(PyListRevIter_Type);
INIT_TYPE(PyList_Type);
INIT_TYPE(PyLongRangeIter_Type);
INIT_TYPE(PyMemberDescr_Type);
INIT_TYPE(PyMemoryView_Type);
INIT_TYPE(PyMethodDescr_Type);
INIT_TYPE(PyMethod_Type);
INIT_TYPE(PyModuleDef_Type);
INIT_TYPE(PyModule_Type);
INIT_TYPE(PyODictItems_Type);
INIT_TYPE(PyODictIter_Type);
INIT_TYPE(PyODictKeys_Type);
INIT_TYPE(PyODictValues_Type);
INIT_TYPE(PyODict_Type);
INIT_TYPE(PyPickleBuffer_Type);
INIT_TYPE(PyProperty_Type);
INIT_TYPE(PyRangeIter_Type);
INIT_TYPE(PyRange_Type);
INIT_TYPE(PyReversed_Type);
INIT_TYPE(PySTEntry_Type);
INIT_TYPE(PySeqIter_Type);
INIT_TYPE(PySetIter_Type);
INIT_TYPE(PySet_Type);
INIT_TYPE(PySlice_Type);
INIT_TYPE(PyStaticMethod_Type);
INIT_TYPE(PyStdPrinter_Type);
INIT_TYPE(PySuper_Type);
INIT_TYPE(PyTraceBack_Type);
INIT_TYPE(PyWrapperDescr_Type);
INIT_TYPE(Py_GenericAliasType);
INIT_TYPE(_PyAnextAwaitable_Type);
INIT_TYPE(_PyAsyncGenASend_Type);
INIT_TYPE(_PyAsyncGenAThrow_Type);
INIT_TYPE(_PyAsyncGenWrappedValue_Type);
INIT_TYPE(_PyCoroWrapper_Type);
INIT_TYPE(_PyInterpreterID_Type);
INIT_TYPE(_PyManagedBuffer_Type);
INIT_TYPE(_PyMethodWrapper_Type);
INIT_TYPE(_PyNamespace_Type);
INIT_TYPE(_PyNone_Type);
INIT_TYPE(_PyNotImplemented_Type);
INIT_TYPE(_PyWeakref_CallableProxyType);
INIT_TYPE(_PyWeakref_ProxyType);
INIT_TYPE(_PyWeakref_RefType);
INIT_TYPE(_PyUnion_Type);
for (size_t i=0; i < Py_ARRAY_LENGTH(static_types); i++) {
PyTypeObject *type = static_types[i];
if (PyType_Ready(type) < 0) {
return _PyStatus_ERR("Can't initialize types");
}
}

return _PyStatus_OK();
#undef INIT_TYPE
}


// Best-effort function clearing static types.
//
// Don't deallocate a type if it still has subclasses. If a Py_Finalize()
// sub-function is interrupted by CTRL+C or fails with MemoryError, some
// subclasses are not cleared properly. Leave the static type unchanged in this
// case.
void
_PyTypes_FiniTypes(PyInterpreterState *interp)
{
if (!_Py_IsMainInterpreter(interp)) {
return;
}

// Deallocate types in the reverse order to deallocate subclasses before
// their base classes.
for (Py_ssize_t i=Py_ARRAY_LENGTH(static_types)-1; i>=0; i--) {
PyTypeObject *type = static_types[i];
// Cannot delete a type if it still has subclasses
if (type->tp_subclasses != NULL) {
continue;
}
_PyStaticType_Dealloc(type);
}
}


void
_Py_NewReference(PyObject *op)
{
Expand Down
28 changes: 22 additions & 6 deletions 28 Objects/typeobject.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4071,6 +4071,18 @@ extern void
_PyDictKeys_DecRef(PyDictKeysObject *keys);


static void
type_dealloc_common(PyTypeObject *type)
{
PyObject *tp, *val, *tb;
PyErr_Fetch(&tp, &val, &tb);
remove_all_subclasses(type, type->tp_bases);
PyErr_Restore(tp, val, tb);

PyObject_ClearWeakRefs((PyObject *)type);
}


void
_PyStaticType_Dealloc(PyTypeObject *type)
{
Expand All @@ -4079,34 +4091,34 @@ _PyStaticType_Dealloc(PyTypeObject *type)
// and a type must no longer be used once it's deallocated.
assert(type->tp_subclasses == NULL);

type_dealloc_common(type);

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)
{
PyObject *tp, *val, *tb;

/* Assert this is a heap-allocated type object */
_PyObject_ASSERT((PyObject *)type, type->tp_flags & Py_TPFLAGS_HEAPTYPE);
_PyObject_GC_UNTRACK(type);
PyErr_Fetch(&tp, &val, &tb);
remove_all_subclasses(type, type->tp_bases);
PyErr_Restore(tp, val, tb);

PyObject_ClearWeakRefs((PyObject *)type);
type_dealloc_common(type);

Py_XDECREF(type->tp_base);
Py_XDECREF(type->tp_dict);
Py_XDECREF(type->tp_bases);
Py_XDECREF(type->tp_mro);
Py_XDECREF(type->tp_cache);
Py_XDECREF(type->tp_subclasses);

/* A type's tp_doc is heap allocated, unlike the tp_doc slots
* of most other objects. It's okay to cast it to char *.
*/
Expand Down Expand Up @@ -6541,6 +6553,10 @@ remove_subclass(PyTypeObject *base, PyTypeObject *type)
PyErr_Clear();
}
Py_XDECREF(key);

if (PyDict_Size(dict) == 0) {
Py_CLEAR(base->tp_subclasses);
}
}

static void
Expand Down
1 change: 1 addition & 0 deletions 1 Python/pylifecycle.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1676,6 +1676,7 @@ finalize_interp_types(PyInterpreterState *interp)
_PyThread_FiniType(interp);
_PyErr_FiniTypes(interp);
_PyTypes_Fini(interp);
_PyTypes_FiniTypes(interp);

// Call _PyUnicode_ClearInterned() before _PyDict_Fini() since it uses
// a dict internally.
Expand Down
Morty Proxy This is a proxified and sanitized view of the page, visit original site.