Re: [Qemu-devel] [PATCH v3 5/5] qom: allow properties to be registered against classes

[Eric Blake]

On 10/08/2015 08:09 AM, Daniel P. Berrange wrote:
> When there are many instances of a given class, registering
> properties against the instance is wasteful of resources. The
> majority of objects have a statically defined list of possible
> properties, so most of the properties are easily registerable
> against the class. Only those properties which are conditionally
> registered at runtime need be recorded against the klass.
> 
> Registering properties against classes also makes it possible
> to provide static introspection of QOM - currently introspection
> is only possible after creating an instance of a class, which
> severely limits its usefulness.
> 
> This impl only supports simple scalar properties. It does not
> attempt to allow child object / link object properties against
> the class. There are ways to support those too, but it would
> make this patch more complicated, so it is left as an exercise
> for the future.
> 
> There is no equivalent to object_property_del provided, since
> classes must be immutable once they are defined.
> 
> Signed-off-by: Daniel P. Berrange <address@hidden>
> ---
>  include/qom/object.h |  47 +++++++++-
>  qom/object.c         | 242 
> ++++++++++++++++++++++++++++++++++++++++++++++++---
>  2 files changed, 275 insertions(+), 14 deletions(-)
> 
> @@ -898,10 +903,11 @@ object_property_add(Object *obj, const char *name, 
> const char *type,
>          return ret;
>      }
>  
> -    if (g_hash_table_contains(obj->properties, name)) {
> +
> +    if (object_property_find(obj, name, NULL) != NULL) {
>          error_setg(errp, "attempt to add duplicate property '%s'"
> -                       " to object (type '%s')", name,
> -                       object_get_typename(obj));
> +                   " to object (type '%s')", name,
> +                   object_get_typename(obj));

Ah, the indentation hunk I noticed in 4/5.

Reviewed-by: Eric Blake <address@hidden>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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