gh-105020: Share tp_bases and tp_mro Between Interpreters For All Static Builtin Types (gh-105115)

In gh-103912 we added tp_bases and tp_mro to each PyInterpreterState.types.builtins entry.  However, doing so ignored the fact that both PyTypeObject fields are public API, and not documented as internal (as opposed to tp_subclasses).  We address that here by reverting back to shared objects, making them immortal in the process.

1 files changed, 23 insertions, 0 deletions

diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index aff09aa..66c1cba 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -2606,6 +2606,27 @@ type_assign_version(PyObject *self, PyObject *type)
 }
 
 
+static PyObject *
+type_get_tp_bases(PyObject *self, PyObject *type)
+{
+    PyObject *bases = ((PyTypeObject *)type)->tp_bases;
+    if (bases == NULL) {
+        Py_RETURN_NONE;
+    }
+    return Py_NewRef(bases);
+}
+
+static PyObject *
+type_get_tp_mro(PyObject *self, PyObject *type)
+{
+    PyObject *mro = ((PyTypeObject *)type)->tp_mro;
+    if (mro == NULL) {
+        Py_RETURN_NONE;
+    }
+    return Py_NewRef(mro);
+}
+
+
 // Test PyThreadState C API
 static PyObject *
 test_tstate_capi(PyObject *self, PyObject *Py_UNUSED(args))
@@ -3361,6 +3382,8 @@ static PyMethodDef TestMethods[] = {
     {"test_py_is_funcs", test_py_is_funcs, METH_NOARGS},
     {"type_get_version", type_get_version, METH_O, PyDoc_STR("type->tp_version_tag")},
     {"type_assign_version", type_assign_version, METH_O, PyDoc_STR("PyUnstable_Type_AssignVersionTag")},
+    {"type_get_tp_bases", type_get_tp_bases, METH_O},
+    {"type_get_tp_mro", type_get_tp_mro, METH_O},
     {"test_tstate_capi", test_tstate_capi, METH_NOARGS, NULL},
     {"frame_getlocals", frame_getlocals, METH_O, NULL},
     {"frame_getglobals", frame_getglobals, METH_O, NULL},