Re: [PATCH v2 06/10] qom/object: Display more helpful message when a parent is missing

[Cornelia Huck <cohuck@redhat.com>]

On Tue, 21 Jan 2020 12:03:45 +0100
Philippe Mathieu-Daudé <philmd@redhat.com> wrote:

> QEMU object model is scarse in documentation. Some calls are
> recursive, and it might be hard to figure out even trivial issues.
> 
> We can avoid developers to waste time in a debugging session by
> displaying a simple error message.
> 
> This commit is also similar to e02bdf1cecd2 ("Display more helpful
> message when an object type is missing").
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> v2: New patch
> ---
>  qom/object.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/qom/object.c b/qom/object.c
> index 0d971ca897..bc13a55094 100644
> --- a/qom/object.c
> +++ b/qom/object.c
> @@ -173,7 +173,11 @@ static TypeImpl *type_get_parent(TypeImpl *type)
>  {
>      if (!type->parent_type && type->parent) {
>          type->parent_type = type_get_by_name(type->parent);
> -        g_assert(type->parent_type != NULL);
> +        if (!type->parent_type) {
> +            fprintf(stderr, "Object '%s' missing its parent '%s'\n",

Maybe s/missing/is missing/ ?

Anyway, a real improvement :)

> +                    type->name, type->parent);
> +            abort();
> +        }
>      }
>  
>      return type->parent_type;

Reviewed-by: Cornelia Huck <cohuck@redhat.com>