Throughout the codebase, instances of mutable heap types must always implement the GC protocol to traverse their type. This leads to the following being repeated a lot:

static int
object_visit(PyObject *op, visitproc visit, void *arg)
{
    Py_VISIT(Py_TYPE(op));
    return 0;
}

To reduce code duplication, I think it would be beneficial to have a common helper for this case. I'm going to call this _PyObject_VisitType for now.

cc @picnixz

Linked PRs

• gh-138342: Use a common utility for visiting an object's type #138343
• gh-138342: Move _PyObject_VisitType() to the internal C API #139734