[libvirt] [PATCH v2 3/8] util: Generate a common internal only error print

[Peter Krempa]

On Fri, Jun 02, 2017 at 06:17:17 -0400, John Ferlan wrote:
> If virObjectIsClass fails "internally" to virobject.c, create a macro to
> generate the VIR_WARN describing what the problem is. Also improve the
> checks and message a bit to indicate which was the failure - whether the
> obj was NULL or just not the right class
> 
> Signed-off-by: John Ferlan <jferlan at redhat.com>
> ---
>  src/util/virobject.c | 16 +++++++++++-----
>  1 file changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/src/util/virobject.c b/src/util/virobject.c
> index 34805d3..9f5f187 100644
> --- a/src/util/virobject.c
> +++ b/src/util/virobject.c
> @@ -47,6 +47,16 @@ struct _virClass {
>      virObjectDisposeCallback dispose;
>  };
>  
> +#define VIR_OBJECT_USAGE_PRINT_WARNING(anyobj, objclass)                    \
> +    do {                                                                    \
> +        virObjectPtr obj = anyobj;                                          \
> +        if (!obj)                                                           \
> +            VIR_WARN("Object %p is not a virObject class instance", anyobj);\

Is this really helpful?

Object (nil) is not a virObject class instance.

%p does not make sense since it's always NULL, and also obviously a
null pointer is not a class instance ...
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