(*Obtained from Cminor.state by deleting the memory components.*)
Inductive CMin_core: Type :=
  | CMin_State:                      (**r Execution within a function *)
      forall (f: function)              (**r currently executing function  *)
             (s: stmt)                  (**r statement under consideration *)
             (k: cont)                  (**r its continuation -- what to do next *)
             (sp: val)                  (**r current stack pointer *)
             (e: env),                   (**r current local environment *)
      CMin_core
  | CMin_Callstate:                  (**r Invocation of a function *)
      forall (f: fundef)                (**r function to invoke *)
             (args: list val)           (**r arguments provided by caller *)
             (k: cont),                  (**r what to do next  *)
      CMin_core
  | CMin_Returnstate:                (**r Return from a function *)
      forall (v: val)                   (**r Return value *)
             (k: cont),                  (**r what to do next *)
      CMin_core.(*Obtained from Cminor.state by deleting the memory components.*)
Inductive CMin_core: Type :=
  | CMin_State:                      (**r Execution within a function *)
      forall (f: function)              (**r currently executing function  *)
             (s: stmt)                  (**r statement under consideration *)
             (k: cont)                  (**r its continuation -- what to do next *)
             (sp: val)                  (**r current stack pointer *)
             (e: env),                   (**r current local environment *)
      CMin_core
  | CMin_Callstate:                  (**r Invocation of a function *)
      forall (f: fundef)                (**r function to invoke *)
             (args: list val)           (**r arguments provided by caller *)
             (k: cont),                  (**r what to do next  *)
      CMin_core
  | CMin_Returnstate:                (**r Return from a function *)
      forall (v: val)                   (**r Return value *)
             (k: cont),                  (**r what to do next *)
      CMin_core.(*Obtained from Cminor.state by deleting the memory components.*)
Inductive CMin_core: Type :=
  | CMin_State:                      (**r Execution within a function *)
      forall (f: function)              (**r currently executing function  *)
             (s: stmt)                  (**r statement under consideration *)
             (k: cont)                  (**r its continuation -- what to do next *)
             (sp: val)                  (**r current stack pointer *)
             (e: env),                   (**r current local environment *)
      CMin_core
  | CMin_Callstate:                  (**r Invocation of a function *)
      forall (f: fundef)                (**r function to invoke *)
             (args: list val)           (**r arguments provided by caller *)
             (k: cont),                  (**r what to do next  *)
      CMin_core
  | CMin_Returnstate:                (**r Return from a function *)
      forall (v: val)                   (**r Return value *)
             (k: cont),                  (**r what to do next *)
      CMin_core.(*Obtained from Cminor.state by deleting the memory components.*)
Inductive CMin_core: Type :=
  | CMin_State:                      (**r Execution within a function *)
      forall (f: function)              (**r currently executing function  *)
             (s: stmt)                  (**r statement under consideration *)
             (k: cont)                  (**r its continuation -- what to do next *)
             (sp: val)                  (**r current stack pointer *)
             (e: env),                   (**r current local environment *)
      CMin_core
  | CMin_Callstate:                  (**r Invocation of a function *)
      forall (f: fundef)                (**r function to invoke *)
             (args: list val)           (**r arguments provided by caller *)
             (k: cont),                  (**r what to do next  *)
      CMin_core
  | CMin_Returnstate:                (**r Return from a function *)
      forall (v: val)                   (**r Return value *)
             (k: cont),                  (**r what to do next *)
      CMin_core.Definition ToState (q:CMin_core) (m:mem): Cminor.state :=
  match q with
     CMin_State f s k sp e => State f s k sp e m
   | CMin_Callstate f args k => Callstate f args k m
   | CMin_Returnstate v k => Returnstate v k m
  end.Definition FromState (c: Cminor.state) : CMin_core * mem :=
  match c with
     State f s k sp e m => (CMin_State f s k sp e, m)
   | Callstate f args k m => (CMin_Callstate f args k, m)
   | Returnstate v k m => (CMin_Returnstate v k, m)
  end.(*
Definition CMin_init_mem (ge:genv)  (m:mem) d:  Prop:=
   Genv.alloc_variables ge Mem.empty d = Some m.
(*Defined initial memory, by adapting the definition of Genv.init_mem*)
*)

(* initial_core : G -> val -> list val -> option C;*)
Definition CMin_initial_core (ge:Cminor.genv) (v: val) (args:list val): option CMin_core :=
   match v with
        Vptr b i =>
          if Int.eq_dec i  Int.zero
          then match Genv.find_funct_ptr ge b with
                 | None => None
                 | Some f => Some (CMin_Callstate f args Kstop)
               end
          else None
      | _ => None
   end.(*
Parameter CMin_MainIdent:ident.

Definition CMin_make_initial_core (ge:genv) (v: val) (args:list val): option CMin_core :=
   match Genv.find_symbol ge CMin_MainIdent with
        None => None
      | Some b => match Genv.find_funct_ptr ge b with
                    None => None
                  | Some f => match funsig f with
                                           {| sig_args := sargs; sig_res := sres |} =>
                                                   match sargs, sres with
                                                      nil, Some Tint => Some (CMin_Callstate f nil Kstop) (*args = nil???*)
                                                   | _ , _ => None
                                                   end
                                       end
                  end
   end.
*)
(*Original Cminor_semantics has this for initial states:
Genv.find_symbol ge p.(prog_main) = Some b ->
      Genv.find_funct_ptr ge b = Some f ->
      funsig f = mksignature nil (Some Tint) ->
      initial_state p (Callstate f nil Kstop m0).*)

Definition CMin_at_external (c: CMin_core) : option (external_function * signature * list val) :=
  match c with
  | CMin_State f s k sp e => None
  | CMin_Callstate fd args k => match fd with
                                  Internal f => None
                                | External ef => Some (ef, ef_sig ef, args)
                              end
  | CMin_Returnstate v k => None
 end.Definition CMin_after_external (vret: option val) (c: CMin_core) : option CMin_core :=
  match c with
    CMin_Callstate fd args k =>
         match fd with
            Internal f => None
          | External ef => match vret with
                             None => Some (CMin_Returnstate Vundef k)
                           | Some v => Some (CMin_Returnstate v k)
                           end
         end
  | _ => None
  end.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.Inductive CMin_corestep (ge : genv) : CMin_core -> mem -> CMin_core -> mem -> Prop:=
  | cmin_corestep_skip_seq: forall f s k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kseq s k) sp e) m
       (CMin_State f s k sp e) m
  | cmin_corestep_skip_block: forall f k sp e m,
      CMin_corestep ge (CMin_State f Sskip (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_skip_call: forall f k sp e m m',
      is_call_cont k ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f Sskip k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef k) m'

  | cmin_corestep_assign: forall f id a k sp e m v,
      eval_expr ge sp e m a v ->
      CMin_corestep ge (CMin_State f (Sassign id a) k sp e) m
       (CMin_State f Sskip k sp (PTree.set id v e)) m

  | cmin_corestep_store: forall f chunk addr a k sp e m vaddr v m',
      eval_expr ge sp e m addr vaddr ->
      eval_expr ge sp e m a v ->
      Mem.storev chunk m vaddr v = Some m' ->
      CMin_corestep ge (CMin_State f (Sstore chunk addr a) k sp e) m
       (CMin_State f Sskip k sp e) m'

  | cmin_corestep_call: forall f optid sig a bl k sp e m vf vargs fd,
      eval_expr ge sp e m a vf ->
      eval_exprlist ge sp e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      CMin_corestep ge (CMin_State f (Scall optid sig a bl) k sp e) m
       (CMin_Callstate fd vargs (Kcall optid f sp e k)) m

  | cmin_corestep_tailcall: forall f sig a bl k sp e m vf vargs fd m',
      eval_expr ge (Vptr sp Int.zero) e m a vf ->
      eval_exprlist ge (Vptr sp Int.zero) e m bl vargs ->
      Genv.find_funct ge vf = Some fd ->
      funsig fd = sig ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Stailcall sig a bl) k (Vptr sp Int.zero) e) m
       (CMin_Callstate fd vargs (call_cont k)) m'

(* WE DO NOT TREAT BUILTINS *)
(*  | cmin_corestep_builtin: forall f optid ef bl k sp e m vargs t vres m',
      eval_exprlist ge sp e m bl vargs ->
      external_call ef ge vargs m t vres m' ->
      CMin_corestep ge (CMin_State f (Sbuiltin optid ef bl) k sp e) m
         (CMin_State f Sskip k sp (set_optvar optid vres e)) m'*)

  | cmin_corestep_seq: forall f s1 s2 k sp e m,
      CMin_corestep ge (CMin_State f (Sseq s1 s2) k sp e) m
       (CMin_State f s1 (Kseq s2 k) sp e) m

  | cmin_corestep_ifthenelse: forall f a s1 s2 k sp e m v b,
      eval_expr ge sp e m a v ->
      Val.bool_of_val v b ->
      CMin_corestep ge (CMin_State f (Sifthenelse a s1 s2) k sp e) m
       (CMin_State f (if b then s1 else s2) k sp e) m

  | cmin_corestep_loop: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sloop s) k sp e) m
       (CMin_State f s (Kseq (Sloop s) k) sp e) m

  | cmin_corestep_block: forall f s k sp e m,
      CMin_corestep ge (CMin_State f (Sblock s) k sp e) m
       (CMin_State f s (Kblock k) sp e) m

  | cmin_corestep_exit_seq: forall f n s k sp e m,
      CMin_corestep ge (CMin_State f (Sexit n) (Kseq s k) sp e) m
       (CMin_State f (Sexit n) k sp e) m
  | cmin_corestep_exit_block_0: forall f k sp e m,
      CMin_corestep ge (CMin_State f (Sexit O) (Kblock k) sp e) m
       (CMin_State f Sskip k sp e) m
  | cmin_corestep_exit_block_S: forall f n k sp e m,
      CMin_corestep ge (CMin_State f (Sexit (S n)) (Kblock k) sp e) m
       (CMin_State f (Sexit n) k sp e) m

  | cmin_corestep_switch: forall f a cases default k sp e m n,
      eval_expr ge sp e m a (Vint n) ->
      CMin_corestep ge (CMin_State f (Sswitch a cases default) k sp e) m
       (CMin_State f (Sexit (switch_target n default cases)) k sp e) m

  | cmin_corestep_return_0: forall f k sp e m m',
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn None) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate Vundef (call_cont k)) m'
  | cmin_corestep_return_1: forall f a k sp e m v m',
      eval_expr ge (Vptr sp Int.zero) e m a v ->
      Mem.free m sp 0 f.(fn_stackspace) = Some m' ->
      CMin_corestep ge (CMin_State f (Sreturn (Some a)) k (Vptr sp Int.zero) e) m
       (CMin_Returnstate v (call_cont k)) m'

  | cmin_corestep_label: forall f lbl s k sp e m,
      CMin_corestep ge (CMin_State f (Slabel lbl s) k sp e) m
       (CMin_State f s k sp e) m

  | cmin_corestep_goto: forall f lbl k sp e m s' k',
      find_label lbl f.(fn_body) (call_cont k) = Some(s', k') ->
      CMin_corestep ge (CMin_State f (Sgoto lbl) k sp e) m
       (CMin_State f s' k' sp e) m

  | cmin_corestep_internal_function: forall f vargs k m m' sp e,
      Mem.alloc m 0 f.(fn_stackspace) = (m', sp) ->
      set_locals f.(fn_vars) (set_params vargs f.(fn_params)) = e ->
      CMin_corestep ge (CMin_Callstate (Internal f) vargs k) m
       (CMin_State f f.(fn_body) k (Vptr sp Int.zero) e) m'
(*no external call
  | step_external_function: forall ef vargs k m t vres m',
      external_call ef ge vargs m t vres m' ->
      sCMin_coretep (CMin_Callstate (External ef) vargs k) m
         t (CMin_Returnstate vres k m') *)

  | cmin_corestep_return: forall v optid f sp e k m,
      CMin_corestep ge (CMin_Returnstate v (Kcall optid f sp e k)) m
       (CMin_State f Sskip k sp (set_optvar optid v e)) m.

(* Specifications: *)
Lemma CMin_corestep_not_at_external: forall ge m q m' q', CMin_corestep ge q m q' m' -> CMin_at_external q = None.