Patch for PR 9399

Daniel Jacobowitz
Thu Dec 10 19:13:00 GMT 2009

No, I think the patch is fine to go in.

On Thu, Dec 10, 2009 at 12:04:09PM -0700, Tom Tromey wrote:
> I think from value_cast_structs:
>   /* Downcasting: look in the type of the target to see if it contains the
>      type of the source as a superclass.  If so, we'll need to
>      offset the pointer rather than just change its type.
>      FIXME: This fails silently with virtual inheritance.  */
> ... but this doesn't fail silently, it tries to dereference NULL, due to
> the use of value_zero.  IIRC.

I see now.  This is just lame.  We should be able to ask this question
about the static type of the target - possibly the easiest way to do
that is to special-case the NULL vptr.  I probably wrote that.

Daniel Jacobowitz

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