Re: [Qemu-devel] [PATCH for-3.2 v5 15/19] qom: add object_class_get_class_data()

[Igor Mammedov <imammedo@redhat.com>]

On Tue,  4 Dec 2018 18:20:19 +0400
Marc-André Lureau <marcandre.lureau@redhat.com> wrote:

> Add a simple function to retrieve the associated class data.
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
>  include/qom/object.h | 9 +++++++++
>  qom/object.c         | 5 +++++
>  2 files changed, 14 insertions(+)
> 
> diff --git a/include/qom/object.h b/include/qom/object.h
> index 5183c587f3..d5266405da 100644
> --- a/include/qom/object.h
> +++ b/include/qom/object.h
> @@ -916,6 +916,15 @@ ObjectClass *object_class_dynamic_cast(ObjectClass *klass,
>   */
>  ObjectClass *object_class_get_parent(ObjectClass *klass);
>  
> +
> +/**
> + * object_class_get_class_data:
> + * @klass: The class to obtain associated data.
> + *
> + * Returns: the class_data given when registering the type.
> + */
> +void *object_class_get_class_data(ObjectClass *klass);
> +
>  /**
>   * object_class_get_name:
>   * @klass: The class to obtain the QOM typename for.
> diff --git a/qom/object.c b/qom/object.c
> index aa6f3a2a71..bbc6fbbc01 100644
> --- a/qom/object.c
> +++ b/qom/object.c
> @@ -867,6 +867,11 @@ const char *object_class_get_name(ObjectClass *klass)
>      return klass->type->name;
>  }
>  
> +void *object_class_get_class_data(ObjectClass *klass)
> +{
> +    return klass->type->class_data;
> +}
> +
>  ObjectClass *object_class_by_name(const char *typename)
>  {
>      TypeImpl *type = type_get_by_name(typename);

alternatively to what's done in 16/19 which requires this helper
you can drop it and use x86 cpu approach, see:

static void x86_cpu_cpudef_class_init(ObjectClass *oc, void *data)               
{                                                                                
    X86CPUDefinition *cpudef = data;                                             
    X86CPUClass *xcc = X86_CPU_CLASS(oc);                                        
                                                                                 
    xcc->cpu_def = cpudef;
    ...