Remark alloc_global_unchanged:
  forall (P: block -> Z -> Prop) m id g m',
  alloc_global m (id, g) = Some m' ->
  Mem.unchanged_on P m m'.Remark alloc_globals_unchanged:
  forall (P: block -> Z -> Prop) gl m m',
  alloc_globals m gl = Some m' ->
  Mem.unchanged_on P m m'.Remark load_store_init_data_invariant:
  forall m m' b,
  (forall chunk ofs, Mem.load chunk m' b ofs = Mem.load chunk m b ofs) ->
  forall il p,
  load_store_init_data m b p il -> load_store_init_data m' b p il.Definition globals_initialized (g: t) (m: mem) :=
  forall b gd,
  find_def g b = Some gd ->
  match gd with
  | Gfun f =>
         Mem.perm m b 0 Cur Nonempty
      /\ (forall ofs k p, Mem.perm m b ofs k p -> ofs = 0 /\ p = Nonempty)
  | Gvar v =>
         Mem.range_perm m b 0 (init_data_list_size v.(gvar_init)) Cur (perm_globvar v)
      /\ (forall ofs k p, Mem.perm m b ofs k p ->
            0 <= ofs < init_data_list_size v.(gvar_init) /\ perm_order (perm_globvar v) p)
      /\ (v.(gvar_volatile) = false -> load_store_init_data m b 0 v.(gvar_init))
      /\ (v.(gvar_volatile) = false -> Mem.loadbytes m b 0 (init_data_list_size v.(gvar_init)) = Some (bytes_of_init_data_list v.(gvar_init)))
  end.

Lemma alloc_global_initialized: forall g m id gd m', genv_next g = Mem.nextblock m -> alloc_global m (id, gd) = Some m' -> globals_initialized g m -> globals_initialized (add_global g (id, gd)) m' /\ genv_next (add_global g (id, gd)) = Mem.nextblock m'.