(*Lenb: removed here. To be moved a more CLight-specific place
Record jm_init_package: Type := {
  jminit_m: Memory.mem;
  jminit_prog: program;
  jminit_G: tycontext.funspecs;
  jminit_lev: nat;
  jminit_init_mem: Genv.init_mem jminit_prog = Some jminit_m;
  jminit_defs_no_dups:   list_norepet (prog_defs_names jminit_prog);
  jminit_fdecs_match: match_fdecs (prog_funct jminit_prog) jminit_G
}.

Definition init_jmem {G} (ge: G) (jm: juicy_mem) (d: jm_init_package) :=
  jm = initial_jm (jminit_prog d) (jminit_m d) (jminit_G d) (jminit_lev d)
         (jminit_init_mem d) (jminit_defs_no_dups d) (jminit_fdecs_match d).
*)
Definition juicy_core_sem
  {C} (csem: @CoreSemantics C mem) :
   @CoreSemantics C juicy_mem :=
  @Build_CoreSemantics _ juicy_mem
    (j_initial_core csem)
    (j_at_external csem)
    (j_after_external csem)
    (j_halted csem)
    (jstep csem)
    (jstep_not_halted csem)
    (jstep_not_at_external csem)
(*  (j_at_external_halted_excl csem)*).Definition upd_exit' (Q_exit : option val -> Z -> juicy_mem -> Prop) :=
  {| ext_spec_type := ext_spec_type spec
   ; ext_spec_pre := ext_spec_pre spec
   ; ext_spec_post := ext_spec_post spec
   ; ext_spec_exit := Q_exit |}.Definition upd_exit'' (ef : external_function) (x : ext_spec_type spec ef) ge :=
    upd_exit' (ext_spec_post spec ef x ge (sig_res (ef_sig ef))).Program Definition upd_exit {ef : external_function} (x : ext_spec_type spec ef) ge :=
    Build_juicy_ext_spec _ (upd_exit'' _ x ge) _ _ _.Program Definition juicy_mem_op (P : pred rmap) : pred juicy_mem :=
  fun jm => P (m_phi jm).

Lemma age_resource_decay: forall b jm1 jm2 jm1' jm2', resource_decay b jm1 jm2 -> age jm1 jm1' -> age jm2 jm2' -> level jm1 = S (level jm2) -> resource_decay b jm1' jm2'.