Inductive valid_genv {F V:Type} (ge:Genv.t F V) (m:mem) : Type :=
  mk_valid_genv :
    (forall b, isGlobalBlock ge b=true -> val_valid (Vptr b Ptrofs.zero) m) ->
    (forall b f, Genv.find_funct_ptr ge b = Some f -> val_valid (Vptr b Ptrofs.zero) m) ->
    valid_genv ge m.Inductive valid_genv {F V:Type} (ge:Genv.t F V) (m:mem) : Type :=
  mk_valid_genv :
    (forall b, isGlobalBlock ge b=true -> val_valid (Vptr b Ptrofs.zero) m) ->
    (forall b f, Genv.find_funct_ptr ge b = Some f -> val_valid (Vptr b Ptrofs.zero) m) ->
    valid_genv ge m.

Lemma valid_genv_alloc: forall {F V:Type} (ge:Genv.t F V) (m m1:mem) lo hi b (ALLOC: Mem.alloc m lo hi = (m1,b)) (G: valid_genv ge m), valid_genv ge m1.