bpo-37879: Suppress subtype_dealloc decref when base type is a C heap type (GH-15323)

The instance destructor for a type is responsible for preparing
an instance for deallocation by decrementing the reference counts
of its referents.

If an instance belongs to a heap type, the type object of an instance
has its reference count decremented while for static types, which
are permanently allocated, the type object is unaffected by the
instance destructor.

Previously, the default instance destructor searched the class
hierarchy for an inherited instance destructor and, if present,
would invoke it.

Then, if the instance type is a heap type, it would decrement the
reference count of that heap type.  However, this could result in the
premature destruction of a type because the inherited instance
destructor should have already decremented the reference count
of the type object.

This change avoids the premature destruction of the type object
by suppressing the decrement of its reference count when an
inherited, non-default instance destructor has been invoked.

Finally, an assertion on the Py_SIZE of a type was deleted.  Heap
types have a non zero size, making this into an incorrect assertion.

https://github.com/python/cpython/pull/15323

1 files changed, 220 insertions, 0 deletions

diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 2b261b6..21061a2 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -32,6 +32,8 @@
 #  error "_testcapi must test the public Python C API, not CPython internal C API"
 #endif
 
+static struct PyModuleDef _testcapimodule;
+
 static PyObject *TestError;     /* set to exception object in init */
 
 /* Raise TestError with test_name + ": " + msg, and return NULL. */
@@ -6169,6 +6171,189 @@ static PyTypeObject MethodDescriptor2_Type = {
     .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | _Py_TPFLAGS_HAVE_VECTORCALL,
 };
 
+PyDoc_STRVAR(heapgctype__doc__,
+"A heap type with GC, and with overridden dealloc.\n\n"
+"The 'value' attribute is set to 10 in __init__.");
+
+typedef struct {
+    PyObject_HEAD
+    int value;
+} HeapCTypeObject;
+
+static struct PyMemberDef heapctype_members[] = {
+    {"value", T_INT, offsetof(HeapCTypeObject, value)},
+    {NULL} /* Sentinel */
+};
+
+static int
+heapctype_init(PyObject *self, PyObject *args, PyObject *kwargs)
+{
+    ((HeapCTypeObject *)self)->value = 10;
+    return 0;
+}
+
+static void
+heapgcctype_dealloc(HeapCTypeObject *self)
+{
+    PyTypeObject *tp = Py_TYPE(self);
+    PyObject_GC_UnTrack(self);
+    PyObject_GC_Del(self);
+    Py_DECREF(tp);
+}
+
+static PyType_Slot HeapGcCType_slots[] = {
+    {Py_tp_init, heapctype_init},
+    {Py_tp_members, heapctype_members},
+    {Py_tp_dealloc, heapgcctype_dealloc},
+    {Py_tp_doc, heapgctype__doc__},
+    {0, 0},
+};
+
+static PyType_Spec HeapGcCType_spec = {
+    "_testcapi.HeapGcCType",
+    sizeof(HeapCTypeObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+    HeapGcCType_slots
+};
+
+PyDoc_STRVAR(heapctype__doc__,
+"A heap type without GC, but with overridden dealloc.\n\n"
+"The 'value' attribute is set to 10 in __init__.");
+
+static void
+heapctype_dealloc(HeapCTypeObject *self)
+{
+    PyTypeObject *tp = Py_TYPE(self);
+    PyObject_Del(self);
+    Py_DECREF(tp);
+}
+
+static PyType_Slot HeapCType_slots[] = {
+    {Py_tp_init, heapctype_init},
+    {Py_tp_members, heapctype_members},
+    {Py_tp_dealloc, heapctype_dealloc},
+    {Py_tp_doc, heapctype__doc__},
+    {0, 0},
+};
+
+static PyType_Spec HeapCType_spec = {
+    "_testcapi.HeapCType",
+    sizeof(HeapCTypeObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
+    HeapCType_slots
+};
+
+PyDoc_STRVAR(heapctypesubclass__doc__,
+"Subclass of HeapCType, without GC.\n\n"
+"__init__ sets the 'value' attribute to 10 and 'value2' to 20.");
+
+typedef struct {
+    HeapCTypeObject base;
+    int value2;
+} HeapCTypeSubclassObject;
+
+static int
+heapctypesubclass_init(PyObject *self, PyObject *args, PyObject *kwargs)
+{
+    /* Call __init__ of the superclass */
+    if (heapctype_init(self, args, kwargs) < 0) {
+        return -1;
+    }
+    /* Initialize additional element */
+    ((HeapCTypeSubclassObject *)self)->value2 = 20;
+    return 0;
+}
+
+static struct PyMemberDef heapctypesubclass_members[] = {
+    {"value2", T_INT, offsetof(HeapCTypeSubclassObject, value2)},
+    {NULL} /* Sentinel */
+};
+
+static PyType_Slot HeapCTypeSubclass_slots[] = {
+    {Py_tp_init, heapctypesubclass_init},
+    {Py_tp_members, heapctypesubclass_members},
+    {Py_tp_doc, heapctypesubclass__doc__},
+    {0, 0},
+};
+
+static PyType_Spec HeapCTypeSubclass_spec = {
+    "_testcapi.HeapCTypeSubclass",
+    sizeof(HeapCTypeSubclassObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
+    HeapCTypeSubclass_slots
+};
+
+PyDoc_STRVAR(heapctypesubclasswithfinalizer__doc__,
+"Subclass of HeapCType with a finalizer that reassigns __class__.\n\n"
+"__class__ is set to plain HeapCTypeSubclass during finalization.\n"
+"__init__ sets the 'value' attribute to 10 and 'value2' to 20.");
+
+static int
+heapctypesubclasswithfinalizer_init(PyObject *self, PyObject *args, PyObject *kwargs)
+{
+    PyTypeObject *base = (PyTypeObject *)PyType_GetSlot(Py_TYPE(self), Py_tp_base);
+    initproc base_init = PyType_GetSlot(base, Py_tp_init);
+    base_init(self, args, kwargs);
+    return 0;
+}
+
+static void
+heapctypesubclasswithfinalizer_finalize(PyObject *self)
+{
+    PyObject *error_type, *error_value, *error_traceback, *m, *oldtype, *newtype;
+
+    /* Save the current exception, if any. */
+    PyErr_Fetch(&error_type, &error_value, &error_traceback);
+
+    m = PyState_FindModule(&_testcapimodule);
+    if (m == NULL) {
+        goto cleanup_finalize;
+    }
+    oldtype = PyObject_GetAttrString(m, "HeapCTypeSubclassWithFinalizer");
+    newtype = PyObject_GetAttrString(m, "HeapCTypeSubclass");
+    if (oldtype == NULL || newtype == NULL) {
+        goto cleanup_finalize;
+    }
+
+    if (PyObject_SetAttrString(self, "__class__", newtype) < 0) {
+        goto cleanup_finalize;
+    }
+    if (PyObject_SetAttrString(
+        oldtype, "refcnt_in_del", PyLong_FromSsize_t(Py_REFCNT(oldtype))) < 0) {
+        goto cleanup_finalize;
+    }
+    if (PyObject_SetAttrString(
+        newtype, "refcnt_in_del", PyLong_FromSsize_t(Py_REFCNT(newtype))) < 0) {
+        goto cleanup_finalize;
+    }
+
+cleanup_finalize:
+    Py_XDECREF(oldtype);
+    Py_XDECREF(newtype);
+
+    /* Restore the saved exception. */
+    PyErr_Restore(error_type, error_value, error_traceback);
+}
+
+static PyType_Slot HeapCTypeSubclassWithFinalizer_slots[] = {
+    {Py_tp_init, heapctypesubclasswithfinalizer_init},
+    {Py_tp_members, heapctypesubclass_members},
+    {Py_tp_finalize, heapctypesubclasswithfinalizer_finalize},
+    {Py_tp_doc, heapctypesubclasswithfinalizer__doc__},
+    {0, 0},
+};
+
+static PyType_Spec HeapCTypeSubclassWithFinalizer_spec = {
+    "_testcapi.HeapCTypeSubclassWithFinalizer",
+    sizeof(HeapCTypeSubclassObject),
+    0,
+    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_FINALIZE,
+    HeapCTypeSubclassWithFinalizer_slots
+};
+
 static PyMethodDef meth_instance_methods[] = {
     {"meth_varargs", meth_varargs, METH_VARARGS},
     {"meth_varargs_keywords", (PyCFunction)(void(*)(void))meth_varargs_keywords, METH_VARARGS|METH_KEYWORDS},
@@ -6380,5 +6565,40 @@ PyInit__testcapi(void)
     TestError = PyErr_NewException("_testcapi.error", NULL, NULL);
     Py_INCREF(TestError);
     PyModule_AddObject(m, "error", TestError);
+
+    PyObject *HeapGcCType = PyType_FromSpec(&HeapGcCType_spec);
+    if (HeapGcCType == NULL) {
+        return NULL;
+    }
+    PyModule_AddObject(m, "HeapGcCType", HeapGcCType);
+
+    PyObject *HeapCType = PyType_FromSpec(&HeapCType_spec);
+    if (HeapCType == NULL) {
+        return NULL;
+    }
+    PyObject *subclass_bases = PyTuple_Pack(1, HeapCType);
+    if (subclass_bases == NULL) {
+        return NULL;
+    }
+    PyObject *HeapCTypeSubclass = PyType_FromSpecWithBases(&HeapCTypeSubclass_spec, subclass_bases);
+    if (HeapCTypeSubclass == NULL) {
+        return NULL;
+    }
+    Py_DECREF(subclass_bases);
+    PyModule_AddObject(m, "HeapCTypeSubclass", HeapCTypeSubclass);
+
+    PyObject *subclass_with_finalizer_bases = PyTuple_Pack(1, HeapCTypeSubclass);
+    if (subclass_with_finalizer_bases == NULL) {
+        return NULL;
+    }
+    PyObject *HeapCTypeSubclassWithFinalizer = PyType_FromSpecWithBases(
+        &HeapCTypeSubclassWithFinalizer_spec, subclass_with_finalizer_bases);
+    if (HeapCTypeSubclassWithFinalizer == NULL) {
+        return NULL;
+    }
+    Py_DECREF(subclass_with_finalizer_bases);
+    PyModule_AddObject(m, "HeapCTypeSubclassWithFinalizer", HeapCTypeSubclassWithFinalizer);
+
+    PyState_AddModule(m, &_testcapimodule);
     return m;
 }