Definition globalfunction_ptr_inject (j:meminj):=
  forall b f, Genv.find_funct_ptr ge b = Some f ->
              j b = Some(b,0) /\ isGlobalBlock ge b = true.

Lemma restrict_GFP_vis: forall mu (GFP : globalfunction_ptr_inject (as_inj mu)) (Glob : forall b, isGlobalBlock ge b = true -> frgnBlocksSrc mu b = true), globalfunction_ptr_inject (restrict (as_inj mu) (vis mu)).