Re: [PATCH v4 22/32] qdev: Wrap getters and setters in separate helpers

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 11 Dec 2020 17:05:19 -0500
Eduardo Habkost <ehabkost@redhat.com> wrote:

> We'll add extra code to the qdev property getters and setters, so
> add wrapper functions where additional actions can be performed.
> 
> The new functions have a "field_prop_" prefix instead of "qdev_"
> because the code will eventually be moved outside
> qdev-properties.c, to common QOM code.
> 
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
> Changes v1 -> v2:
> * Redone after changes in previous patches in the series
> * Renamed functions from static_prop_* to field_prop_*
> ---
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: "Daniel P. Berrangé" <berrange@redhat.com>
> Cc: Eduardo Habkost <ehabkost@redhat.com>
> Cc: qemu-devel@nongnu.org
> ---
>  hw/core/qdev-properties.c | 44 +++++++++++++++++++++++++++++++++++----
>  1 file changed, 40 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
> index c68a20695d..b924f13d58 100644
> --- a/hw/core/qdev-properties.c
> +++ b/hw/core/qdev-properties.c
> @@ -44,6 +44,40 @@ void *qdev_get_prop_ptr(Object *obj, Property *prop)
>      return ptr;
>  }
>  
> +static void field_prop_get(Object *obj, Visitor *v, const char *name,
> +                           void *opaque, Error **errp)
> +{
> +    Property *prop = opaque;
> +    return prop->info->get(obj, v, name, opaque, errp);
> +}
> +
> +/**
> + * field_prop_getter: Return getter function to be used for property
> + *
> + * Return value can be NULL if @info has no getter function.
> + */
> +static ObjectPropertyAccessor *field_prop_getter(const PropertyInfo *info)
> +{
> +    return info->get ? field_prop_get : NULL;
> +}
> +
> +static void field_prop_set(Object *obj, Visitor *v, const char *name,
> +                           void *opaque, Error **errp)
> +{
> +    Property *prop = opaque;
> +    return prop->info->set(obj, v, name, opaque, errp);
> +}
> +
> +/**
> + * field_prop_setter: Return setter function to be used for property
> + *
> + * Return value can be NULL if @info has not setter function.
> + */
> +static ObjectPropertyAccessor *field_prop_setter(const PropertyInfo *info)
> +{
> +    return info->set ? field_prop_set : NULL;
> +}
> +
>  void qdev_propinfo_get_enum(Object *obj, Visitor *v, const char *name,
>                              void *opaque, Error **errp)
>  {
> @@ -630,8 +664,8 @@ static void set_prop_arraylen(Object *obj, Visitor *v, const char *name,
>          assert(qdev_get_prop_ptr(obj, &arrayprop->prop) == eltptr);
>          object_property_add(obj, propname,
>                              arrayprop->prop.info->name,
> -                            arrayprop->prop.info->get,
> -                            arrayprop->prop.info->set,
> +                            field_prop_getter(arrayprop->prop.info),
> +                            field_prop_setter(arrayprop->prop.info),
>                              array_element_release,
>                              arrayprop);
>      }
> @@ -873,7 +907,8 @@ void qdev_property_add_static(DeviceState *dev, Property *prop)
>      assert(!prop->info->create);
>  
>      op = object_property_add(obj, prop->name, prop->info->name,
> -                             prop->info->get, prop->info->set,
> +                             field_prop_getter(prop->info),
> +                             field_prop_setter(prop->info),
>                               prop->info->release,
>                               prop);
>  
> @@ -900,7 +935,8 @@ static void qdev_class_add_property(DeviceClass *klass, const char *name,
>  
>          op = object_class_property_add(oc,
>                                         name, prop->info->name,
> -                                       prop->info->get, prop->info->set,
> +                                       field_prop_getter(prop->info),
> +                                       field_prop_setter(prop->info),
>                                         prop->info->release,
>                                         prop);
>          if (prop->set_default) {