Re: [Qemu-devel] [RFC v0 5/8] object: make interfaces concrete

["Andreas Färber" <afaerber@suse.de>]

Am 13.06.2012 12:42, schrieb Paolo Bonzini:
> Il 13/06/2012 12:28, Andreas Färber ha scritto:
>> I am pretty certain that object_new() is NOT called recursively!
> 
> It is for interfaces:
> 
> object_new
>   ->object_new_with_type
>   ->object_initialize_with_type
>   ->object_init_with_type
>   ->object_interface_init
> 
> and then:
> 
> static void object_interface_init(Object *obj, InterfaceImpl *iface)
> {
>     TypeImpl *ti = iface->type;
>     Interface *iface_obj;
> 
>     assert(!object_is_interface(obj));
>     iface_obj = INTERFACE(object_new(ti->name));
>     iface_obj->iface_obj = obj;
>     iface_obj->iface_parent.interfaces = INTERFACE_MAGIC;
> 
>     obj->interfaces = g_slist_prepend(obj->interfaces, iface_obj);
> }

Ouch! One can argue that's still not recursive, but what matters more
this borks Anthony's in-place object_initialize() concept.

Two solutions come to mind:
* allocate the interfaces as part of object_new() beyond instance_size
* let initialize stage return Error*

I'm starting to tend towards the latter since that also addresses
failure to add properties.

Andreas

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