Re: Handling of interfaces in SimpleVerifier

  Le 04/01/2011 16:29, Michael Orlov a écrit :
> Hi,
>
> I don't understand the recent change in SimpleVerifier's
> isAssignableFrom() method (in 3.3.1):
>
> +                if (isInterface) {
> +                    return u.getSort() == Type.OBJECT || u.getSort()
>    == Type.ARRAY;
> +                }
>
> and
>
> -        return getClass(t).isAssignableFrom(getClass(u));
> +        Class tc = getClass(t);
> +        if (tc.isInterface()) {
> +            tc = Object.class;
> +        }
> +        return tc.isAssignableFrom(getClass(u));
>
> Consider t=Comparable and u=Class, or t=Comparable and u=Object. Both
> cases should return false, but isAssignableFrom() returns true. Maybe I
> am missing something?
>
> Thanks,
> Michael

The main problem is that you can't create a java.lang.Class which is the
union (merge) of two interfaces so isAssignableFrom need to be relaxed.

The SUN verifier implements exactly the same rule and the VM
later checks interface at runtime.

Rémi

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