Guido van Rossum <guido@python.org> writes:
> > That could happen in gen0 already: when traversing an object, watch
> > whether it contains any tracked objects. If it doesn't, invoke
> > tp_is_immutable, if that returns true, untrack it.
>
> Unfortunately, the visit API doesn't make it easy to watch this; a
> tuple calls visit() on its items but learns nothing except whether it
> failed. (I've never seen a visit() implementation that could fail, so
> I'm not sure even why the return code exists.)
However, the visit function could record this result. For example, for
move_root_reachable:
struct m_r_r{
PyGC_Head *reachable;
int immutable_nonnested;
};
static int
visit_move(PyObject *op, struct m_r_r *tolist)
{
if(PyObject_IS_GC(op)){
if(GC_is_tracked(op))
m_r_r->tolist.immutable_nonnested = 0;
...
}
return 0;
}
static void
move_root_reachable(PyGC_Head *reachable)
{
struct m_r_r my_m_r_r;
my_m_r_r.reachable = reachable;
for (; gc != reachable; gc=gc->gc.gc_next) {
/* careful, reachable list is growing here */
PyObject *op = FROM_GC(gc);
traverse = op->ob_type->tp_traverse;
my_m_r_r.immutable_nonnested = 1;
(void) traverse(op,
(visitproc)visit_move,
(void *)reachable);
if(my_m_r_r.immutable_nonnested
&& op->ob_type->tp_immutable(op)){
GC_Untrack(op);
}
}
}
I'm not sure whether move_root_reachable would be the right place to
untrack those objects, but the information is all there.
Regards,
Martin
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