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Make sure to properly untrack gc objects before freeing them (#4461)

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* Make sure to properly untrack gc objects before freeing them

* style: pre-commit fixes

* Fix lint

* Add comment about where the original track comes from

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
This commit is contained in:
albanD 2023-01-18 21:11:26 +01:00 committed by Henry Schreiner
parent 4f6183cfe2
commit da780a00ae
1 changed files with 9 additions and 1 deletions
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10
include/pybind11/detail/class.h
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@ -445,9 +445,17 @@ inline void clear_instance(PyObject *self) {
/// Instance destructor function for all pybind11 types. It calls `type_info.dealloc`
/// to destroy the C++ object itself, while the rest is Python bookkeeping.
extern "C" inline void pybind11_object_dealloc(PyObject *self) {
auto *type = Py_TYPE(self);
// If this is a GC tracked object, untrack it first
// Note that the track call is implicitly done by the
// default tp_alloc, which we never override.
if (PyType_HasFeature(type, Py_TPFLAGS_HAVE_GC) != 0) {
PyObject_GC_UnTrack(self);
}
clear_instance(self);
auto *type = Py_TYPE(self);
type->tp_free(self);
#if PY_VERSION_HEX < 0x03080000