Definition guard (Espec : OracleKind)
    (gx: genv) (Delta: tycontext) (P : assert)  (ctl: cont) : pred nat :=
  _guard Espec gx Delta P (current_function ctl) ctl.Definition zap_fn_return (f: function) : function :=
 mkfunction Tvoid f.(fn_callconv) f.(fn_params) f.(fn_vars) f.(fn_temps) f.(fn_body).Definition exit_cont (ek: exitkind) (vl: option val) (k: cont) : cont :=
  match ek with
  | EK_normal => k
  | EK_break => break_cont k
  | EK_continue => continue_cont k
  | EK_return =>
         match vl, call_cont k with
         | Some v, Kcall (Some x) f ve te :: k' =>
                    Kseq (Sreturn None) :: Kcall None (zap_fn_return f) ve (PTree.set x v te) :: k'
         | _,_ => Kseq (Sreturn None) :: call_cont k
         end
   end.Record semaxArg :Type := SemaxArg {
 sa_Delta: tycontext;
 sa_P: assert;
 sa_c: statement;
 sa_R: ret_assert
}.Record semaxArg :Type := SemaxArg {
 sa_Delta: tycontext;
 sa_P: assert;
 sa_c: statement;
 sa_R: ret_assert
}.Record semaxArg :Type := SemaxArg {
 sa_Delta: tycontext;
 sa_P: assert;
 sa_c: statement;
 sa_R: ret_assert
}.Record semaxArg :Type := SemaxArg {
 sa_Delta: tycontext;
 sa_P: assert;
 sa_c: statement;
 sa_R: ret_assert
}.Record semaxArg :Type := SemaxArg {
 sa_Delta: tycontext;
 sa_P: assert;
 sa_c: statement;
 sa_R: ret_assert
}.Record semaxArg :Type := SemaxArg {
 sa_Delta: tycontext;
 sa_P: assert;
 sa_c: statement;
 sa_R: ret_assert
}.Definition ext_spec_pre' (Espec: OracleKind) (ef: external_function)
   (x': ext_spec_type OK_spec ef) (ge_s: injective_PTree block)
   (ts: list typ) (args: list val) (z: OK_ty) : pred juicy_mem :=
  exist (hereditary age)
     (ext_spec_pre OK_spec ef x' ge_s ts args z)
     (JE_pre_hered _ _ _ _ _ _ _ _).Program Definition ext_spec_post' (Espec: OracleKind)
   (ef: external_function) (x': ext_spec_type OK_spec ef) (ge_s: injective_PTree block)
   (tret: option typ) (ret: option val) (z: OK_ty) : pred juicy_mem :=
  exist (hereditary age)
   (ext_spec_post OK_spec ef x' ge_s tret ret z)
     (JE_post_hered _ _ _ _ _ _ _ _).Fixpoint make_ext_args (gx: genviron) (ids: list ident) (vl: list val)  :=
  match ids, vl with
  | id::ids', v::vl' => env_set (make_ext_args gx ids' vl') id v
  | _, v::vl' => env_set (make_ext_args gx ids vl') 1%positive v
  | _, _ => mkEnviron gx (Map.empty _) (Map.empty _)
 end.Definition make_ext_rval  (gx: genviron) (v: option val):=
  match v with
  | Some v' =>  mkEnviron gx (Map.empty _)
                              (Map.set 1%positive v' (Map.empty _))
  | None => mkEnviron gx (Map.empty _) (Map.empty _)
  end.Definition tc_option_val (sig: type) (ret: option val) :=
  match sig, ret with
    | Tvoid, None => True
    | Tvoid, Some _ => False
    | ty, Some v => tc_val ty v
    | _, _ => False
  end.Fixpoint zip_with_tl {A : Type} (l1 : list A) (l2 : typelist) : list (A*type) :=
  match l1, l2 with
    | a::l1', Tcons b l2' => (a,b)::zip_with_tl l1' l2'
    | _, _ => nil
  end.Definition fn_funsig (f: function) : funsig := (fn_params f, fn_return f).Definition var_sizes_ok (cenv: composite_env) (vars: list (ident*type)) :=
   Forall (fun var : ident * type => @sizeof cenv (snd var) <= Ptrofs.max_unsigned)%Z vars.Definition stackframe_of' (cenv: composite_env) (f: Clight.function) : assert :=
  fold_right (fun P Q rho => P rho * Q rho) (fun rho => emp)
     (map (fun idt => var_block' Share.top cenv idt) (Clight.fn_vars f)).Definition empty_environ (ge: genv) := mkEnviron (filter_genv ge) (Map.empty _) (Map.empty _).Definition semax'  {CS: compspecs} (Espec: OracleKind) Delta P c R : pred nat :=
     HORec (semax_  Espec) (SemaxArg Delta P c R).Definition semax {CS: compspecs} (Espec: OracleKind) (Delta: tycontext) P c Q :=
  forall n, semax' Espec Delta P c Q n.

Lemma unfash_andp: forall {A} {agA: ageable A} (P Q: pred nat), (@unfash A agA (andp P Q) = andp (@unfash A agA P) (@unfash A agA Q)).