(** * Compatibility with memory injections *)
(** Relating two memory values according to a memory injection. *)
Inductive memval_inject (f: meminj): memval -> memval -> Prop :=
| memval_inject_byte:
forall n, memval_inject f (Byte n) (Byte n)
| memval_inject_frag:
forall v1 v2 q n,
Val.inject f v1 v2 ->
memval_inject f (Fragment v1 q n) (Fragment v2 q n)
| memval_inject_undef:
forall mv, memval_inject f Undef mv.

Lemma memval_inject_incr:
forall f f' v1 v2, memval_inject f v1 v2 -> inject_incr f f' -> memval_inject f' v1 v2.