Am 31.05.2012 10:30, schrieb Markus Armbruster:
> Igor Mitsyanko <i.mitsya...@samsung.com> writes:
>
>> On 05/30/2012 08:19 PM, Igor Mammedov wrote:
>>> without assert it will crash at following point:
>>> OBJECT_CHECK(type, obj, name) \
>>> ((type *)object_dynamic_cast_assert(OBJECT(obj), (name)))
>>> => object_dynamic_cast(obj, typename)
>>> => object_is_type(obj, target_type)
>>> => type_is_ancestor(obj->class->type, target_type);
>>> ^^^
>>> so abort earlier and print nice message instead of SIGSEGV
>>>
>>> Signed-off-by: Igor Mammedov<imamm...@redhat.com>
>>> ---
>>> qom/object.c | 2 ++
>>> 1 files changed, 2 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/qom/object.c b/qom/object.c
>>> index 00bb3b0..444e2fc 100644
>>> --- a/qom/object.c
>>> +++ b/qom/object.c
>>> @@ -481,6 +481,8 @@ Object *object_dynamic_cast_assert(Object *obj, const
>>> char *typename)
>>> {
>>> Object *inst;
>>>
>>> + g_assert(obj != NULL);
>>> +
>>> inst = object_dynamic_cast(obj, typename);
>>>
>>> if (!inst) {
>> Makes much sense, but maybe it should be done in OBJECT() cast? Assert
>> when we do OBJECT(NULL).
>
> In my opinion, OBJECT(p) where p is a null pointer is perfectly valid
> and should yield a null pointer.
Paolo, today OBJECT(p) is a pure C cast. I wonder if that was due to
TYPE_OBJECT being NULL at the time. Should we reconsider that on
qom-next with your patches to turn TYPE_OBJECT into a regular type?
Andreas
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