root/src/Clight/CexecComplete.ma @ 1058

include "Clight/Cexec.ma".

definition yields ≝ λA.λa:res A.λv':A.
match a with [ OK v ⇒ v' = v | _ ⇒ False ].

(* This tells us that some execution of a results in v'.
   (There may be many possible executions due to I/O, but we're trying to prove
   that one particular one exists corresponding to a derivation in the inductive
   semantics.) *)
let rec yieldsIO (A:Type[0]) (a:IO io_out io_in A) (v':A) on a : Prop ≝
match a with [ Value v ⇒ v' = v | Interact _ k ⇒ ∃r.yieldsIO A (k r) v' | _ ⇒ False ].

definition yields_sig : ∀A,P. res (Sig A P) → A → Prop ≝
λA,P,e,v. match e with [ OK v' ⇒ match v' with [ dp v'' _ ⇒ v = v'' ] | _ ⇒ False].

let rec yieldsIO_sig (A:Type[0]) (P:A → Prop) (e:IO io_out io_in (Sig A P)) (v:A) on e : Prop ≝
match e with
[ Value v' ⇒ match v' with [ dp v'' _ ⇒ v = v'' ]
| Interact _ k ⇒ ∃r.yieldsIO_sig A P (k r) v
| _ ⇒ False].

lemma remove_io_sig: ∀A. ∀P:A → Prop. ∀a,v',p.
yieldsIO A a v' →
yieldsIO_sig A P (io_inject io_out io_in A P (Some ? a) p) v'.
#A #P #a elim a;
[ #a #k #IH #v' #p #H whd in H ⊢ %; elim H; #r #H' %{ r} @IH @H'
| #v #v' #p #H @H
| #a #b #c *;
] qed.

lemma yields_eq: ∀A,a,v'. yields A a v' → a = OK ? v'.
#A #a #v' cases a; // #m whd in ⊢ (% → ?) *;
qed. 

lemma yields_sig_eq: ∀A,P,e,v. yields_sig A P e v → ∃p. e = OK ? (dp … v p).
#A #P #e #v cases e;
[ #vp cases vp; #v' #p #H whd in H; >H %{ p} @refl
| #m *;
] qed.

lemma is_pointer_compat_true: ∀b,sp.
  pointer_compat b sp →
  is_pointer_compat b sp = true.
#b #sp #H whd in ⊢ (??%?);
elim (pointer_compat_dec b sp);
[ //
| #H' @False_ind @(absurd … H H')
] qed.

lemma dec_true: ∀P:Prop.∀f:P + ¬P.∀p:P.∀Q:(P + ¬P) → Type[0]. (∀p'.Q (inl ?? p')) → Q f.
#P #f #p #Q #H cases f;
[ @H 
| #np cut False [ @(absurd ? p np) | * ]
] qed.

lemma dec_false: ∀P:Prop.∀f:P + ¬P.∀p:¬P.∀Q:(P + ¬P) → Type[0]. (∀p'.Q (inr ?? p')) → Q f.
#P #f #p #Q #H cases f;
[ #np cut False [ @(absurd ? np p) | * ]
| @H
] qed.

theorem is_det: ∀p,s,s'.
initial_state p s → initial_state p s' → s = s'.
#p #s #s' #H1 #H2
inversion H1; #b1 #f1 #ge1 #m1 #e11 #e12 #e13 #e14 #e15
inversion H2; #b2 #f2 #ge2 #m2 #e21 #e22 #e23 #e24 #e25
>e11 in e21 #e1 >(?:ge1 = ge2) in e13 e14
[ 2: destruct (e1) skip (e11); @refl ]
#e13 #e14

>e12 in e22 #e2 destruct (e2) skip (e12);

>e13 in e23 #e3 >(?:b1 = b2) in e14
[ >e24 #e4 >(?:f2 = f1)
  [ //;
  | destruct (e4) skip (e24 e25); //;
  ]
| destruct (e3) skip (e13); // 
] qed.


theorem the_initial_state:
  ∀p,s. initial_state p s → ∃ge. yields ? (make_initial_state p) 〈ge,s〉.
#p #s cases p; #fns #main #globs #H
inversion H;
#b #f #ge #m #e1 #e2 #e3 #e4 #e5 %{ge}
whd in ⊢ (??%?);
>e1
whd in ⊢ (??%?);
>e2
whd in ⊢ (??%?);
>e3
whd in ⊢ (??%?);
>e4
whd; @refl
qed.

lemma cast_complete: ∀m,v,ty,ty',v'.
  cast m v ty ty' v' → yields ? (exec_cast m v ty ty') v'.
#m #v #ty #ty' #v' #H
elim H;
[ #m #sz1 #sz2 #sg1 #sg2 #i whd in ⊢ (??%?) >intsize_eq_elim_true @refl
| #m #f #sz #szi #sg @refl
| #m #sz #sz' #sg #i whd in ⊢ (??%?) >intsize_eq_elim_true @refl
| #m #f #sz #sz' @refl
| #m #r #r' #ty #ty' #b #pc #ofs #H1 #H2 #pc'
    elim H1 in pc ⊢ % [ #r1 #ty1 #pc | #r1 #ty1 #n1 #pc | #tys1 #ty1 #pc letin r1 ≝ Code ]
    whd in ⊢ (??%?)
    [ 1,2: @(dec_true ? (eq_region_dec r1 r1) (refl ??) …) #H0 whd in ⊢ (??%?) ]
    elim H2 in pc' ⊢ %; [ 1,4,7: #sp2 #ty2 | 2,5,8: #sp2 #ty2 #n2 | 3,6,9: #tys2 #ty2 letin sp2 ≝ Code ]
    #pc' whd in ⊢ (??%?) 
    @(dec_true ? (pointer_compat_dec b sp2) pc') //
| #m #sz #si #ty'' #r #H cases H; [ #s #t | #s #t #n | #tys #ty0 ] whd in ⊢ (??%?)
  >intsize_eq_elim_true whd in ⊢ (??%?) cases sz //;
| #m #t #t' #r #r' #H #H' cases H; try #a try #b try #c cases H'; try #d try #e try #f
    whd in ⊢ (??%?); try @refl @(dec_true ? (eq_region_dec a a) (refl ??)) #H0 @refl
] qed.

(* Use to narrow down the choice of expression to just the lvalues. *)
lemma lvalue_expr: ∀ge,env,m,e,ty,l,ofs,tr. ∀P:expr_descr → Prop.
  eval_lvalue ge env m (Expr e ty) l ofs tr → 
  (∀id. P (Evar id)) → (∀e'. P (Ederef e')) → (∀e',id. P (Efield e' id)) →
  P e.
#ge #env #m #e #ty #l #ofs #tr #P #H @(eval_lvalue_inv_ind … H)
[ #id #l #ty #e1 #e2 #e3 #e4 #e5 #e6 destruct; //
| #id #sp #l #ty #e1 #e2 #e3 #e4 #e5 #e6 #e7 destruct; //
| #e #ty #sp #l #ofs #tr #H #e1 #e2 #e3 #e4 #e5 destruct; //
| #e #id #ty #l #ofs #id' #fs #d #tr #H #e1 #e2 (* bogus? *) #_ #e3 #e4 #e5 #e6 #e7 destruct; //
| #e #id #ty #l #ofs #id' #fs #tr #H #e1 (* bogus? *) #_ #e2 #e3 #e4 #e5 #e6 destruct; //
] qed.

lemma bool_of_val_3_complete : ∀v,ty,r. bool_of_val v ty r → ∃b. r = of_bool b ∧ yields ? (exec_bool_of_val v ty) b.
#v #ty #r #H elim H; #v #t #H' elim H';
  [ #sz #sg #i #ne %{ true} % //; whd in ⊢ (??%?) >intsize_eq_elim_true
    >(eq_bv_false … ne) //
  | #r #b #pc #i #i0 #s %{ true} % //
  | #f #s #ne %{ true} % //; whd; >(Feq_zero_false … ne) //;
  | #sz #sg %{ false} % // whd in ⊢ (??%?) >intsize_eq_elim_true >eq_bv_true //
  | #r #r' #t %{ false} % //;
  | #s %{ false} % //; whd; >(Feq_zero_true …) //;
  ]
qed.

lemma bool_of_true: ∀v,ty. is_true v ty → yields ? (exec_bool_of_val v ty) true.
#v #ty #H elim H;
  [ #i #is #s #ne whd in ⊢ (??%?) >intsize_eq_elim_true >(eq_bv_false … ne) //;
  | #p #b #i #i0 #s //
  | #f #s #ne whd; >(Feq_zero_false … ne) //;
  ]
qed.

lemma bool_of_false: ∀v,ty. is_false v ty → yields ? (exec_bool_of_val v ty) false.
#v #ty #H elim H;
  [ #sz #sg whd in ⊢ (??%?) >intsize_eq_elim_true >eq_bv_true //;
  | #r #r' #t //;
  | #s whd; >(Feq_zero_true …) //;
  ]
qed.

lemma expr_lvalue_complete: ∀ge,env,m.
(∀e,v,tr. eval_expr ge env m e v tr → yields ? (exec_expr ge env m e) (〈v,tr〉)) ∧
(∀e,l,off,tr. eval_lvalue ge env m e l off tr → yields ? (exec_lvalue ge env m e) (〈〈l,off〉,tr〉)).
#ge #env #m
@(combined_expr_lvalue_ind ge env m
  (λe,v,tr,H. yields ? (exec_expr ge env m e) (〈v,tr〉))
  (λe,l,off,tr,H. yields ? (exec_lvalue ge env m e) (〈〈l,off〉,tr〉)));
[ #sz #sg #i whd in ⊢ (??%?) >eq_intsize_true @refl
| #f #ty @refl
| #e #ty #l #off #v #tr #H1 #H2 @(lvalue_expr … H1)
    [ #id | #e' | #e' #id ] #H3
    whd in ⊢ (??%?)
    [ change in H3:(??%?) with (exec_lvalue' ge env m (Evar id) ty)
    | change in H3:(??%?) with (exec_lvalue' ge env m (Ederef e') ty)
    | change in H3:(??%?) with (exec_lvalue' ge env m (Efield e' id) ty)
    ]
    >(yields_eq ??? H3)
    whd in ⊢ (??%?) change in H2:(??%?) with (load_value_of_type' ty m 〈l,off〉)
    >H2 @refl
| #e #ty #r #l #pc #off #tr #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? H2) whd in ⊢ (??%?)
    @(dec_true ? (pointer_compat_dec l r) pc) #pc' whd
    @refl
| #ty' #sz #sg @refl
| #op #e #ty #v1 #v #tr #H1 #H2 #H3 whd in ⊢ (??%?);
    >(yields_eq ??? H3)
    whd in ⊢ (??%?); >H2 @refl
| #op #e1 #e2 #ty #v1 #v2 #v #tr1 #tr2 #H1 #H2 #e3 #H4 #H5 whd in ⊢ (??%?);
    >(yields_eq ??? H4) whd in ⊢ (??%?);
    >(yields_eq ??? H5) whd in ⊢ (??%?);
    >e3 @refl
| #e1 #e2 #e3 #ty #v1 #v2 #tr1 #tr2 #H1 #H2 #H3 #H4 #H5 whd in ⊢ (??%?);
    >(yields_eq ??? H4) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_true ?? H2))
    >(yields_eq ??? H5)
    @refl
| #e1 #e2 #e3 #ty #v1 #v2 #tr1 #tr2 #H1 #H2 #H3 #H4 #H5 whd in ⊢ (??%?);
    >(yields_eq ??? H4) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_false ?? H2))
    >(yields_eq ??? H5)
    @refl
| #e1 #e2 #ty #v1 #tr #H1 #H2 #H3 whd in ⊢ (??%?);
    >(yields_eq ??? H3) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_true ?? H2))
    @refl
| #e1 #e2 #ty #v1 #v2 #v #tr1 #tr2 #H1 #H2 #H3 #H4 #H5 #H6 whd in ⊢ (??%?);
    >(yields_eq ??? H5) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_false ?? H2))
    >(yields_eq ??? H6) whd in ⊢ (??%?);
    elim (bool_of_val_3_complete … H4); #b *; #evb #Hb
    >(yields_eq ??? Hb) whd in ⊢ (??%?); <evb
    @refl
| #e1 #e2 #ty #v1 #tr #H1 #H2 #H3 whd in ⊢ (??%?);
    >(yields_eq ??? H3) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_false ?? H2))
    @refl
| #e1 #e2 #ty #v1 #v2 #v #tr1 #tr2 #H1 #H2 #H3 #H4 #H5 #H6 whd in ⊢ (??%?);
    >(yields_eq ??? H5) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_true ?? H2))
    >(yields_eq ??? H6) whd in ⊢ (??%?);
    elim (bool_of_val_3_complete … H4); #b *; #evb #Hb
    >(yields_eq ??? Hb) whd in ⊢ (??%?); <evb
    @refl
| #e #ty #ty' #v1 #v #tr #H1 #H2 #H3 whd in ⊢ (??%?);
    >(yields_eq ??? H3) whd in ⊢ (??%?);
    >(yields_eq ??? (cast_complete … H2))
    @refl
| #e #ty #v #l #tr #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? H2) whd in ⊢ (??%?);
    @refl
    
  (* lvalues *)
| #id #l #ty #e1 whd in ⊢ (??%?); >e1 @refl
| #id #l #ty #e1 #e2 whd in ⊢ (??%?); >e1
    >e2 @refl
| #e #ty #r #l #pc #ofs #tr #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? H2)
    @refl
| #e #i #ty #l #ofs #id #fList #delta #tr #H1 #H2 #H3 #H4 cases e in H2 H4 ⊢ %;
    #e' #ty' #H2 whd in H2:(??%?); >H2 #H4 whd in ⊢ (??%?);
    >(yields_eq ??? H4) whd in ⊢ (??%?);
    >H3 @refl
| #e #i #ty #l #ofs #id #fList #tr cases e; #e' #ty' #H1 #H2
    whd in H2:(??%?); >H2 #H3 whd in ⊢ (??%?);
    >(yields_eq ??? H3) @refl
] qed.

theorem expr_complete:  ∀ge,env,m.
 ∀e,v,tr. eval_expr ge env m e v tr → yields ? (exec_expr ge env m e) (〈v,tr〉).
#ge #env #m elim (expr_lvalue_complete ge env m); /2/; qed.

theorem exprlist_complete: ∀ge,env,m,es,vs,tr.
  eval_exprlist ge env m es vs tr → yields ? (exec_exprlist ge env m es) (〈vs,tr〉).
#ge #env #m #es #vs #tr #H elim H;
[ @refl
| #e #et #v #vt #tr #trt #H1 #H2 #H3 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? H3)
    @refl
] qed. 

theorem lvalue_complete: ∀ge,env,m.
 ∀e,l,off,tr. eval_lvalue ge env m e l off tr → yields ? (exec_lvalue ge env m e) (〈〈l,off〉,tr〉).
#ge #env #m elim (expr_lvalue_complete ge env m); /2/; qed.

let rec P_typelist (P:type → Prop) (l:typelist) on l : Prop ≝
match l with
[ Tnil ⇒ True
| Tcons h t ⇒ P h ∧ P_typelist P t
].

let rec type_ind2l
  (P:type → Prop) (Q:typelist → Prop)
  (vo:P Tvoid)
  (it:∀i,s. P (Tint i s))
  (fl:∀f. P (Tfloat f))
  (pt:∀s,t. P t → P (Tpointer s t))
  (ar:∀s,t,n. P t → P (Tarray s t n))
  (fn:∀tl,t. Q tl → P t → P (Tfunction tl t))
  (st:∀i,fl. P (Tstruct i fl))
  (un:∀i,fl. P (Tunion i fl))
  (cp:∀r,i. P (Tcomp_ptr r i))
  (nl:Q Tnil)
  (cs:∀t,tl. P t → Q tl → Q (Tcons t tl))
 (t:type) on t : P t ≝
  match t return λt'.P t' with
  [ Tvoid ⇒ vo
  | Tint i s ⇒ it i s
  | Tfloat s ⇒ fl s
  | Tpointer s t' ⇒ pt s t' (type_ind2l P Q vo it fl pt ar fn st un cp nl cs t')
  | Tarray s t' n ⇒ ar s t' n (type_ind2l P Q vo it fl pt ar fn st un cp nl cs t')
  | Tfunction tl t' ⇒ fn tl t' (typelist_ind2l P Q vo it fl pt ar fn st un cp nl cs tl) (type_ind2l P Q vo it fl pt ar fn st un cp nl cs t')
  | Tstruct i fs ⇒ st i fs
  | Tunion i fs ⇒ un i fs
  | Tcomp_ptr r i ⇒ cp r i
  ]
and typelist_ind2l
  (P:type → Prop) (Q:typelist → Prop)
  (vo:P Tvoid)
  (it:∀i,s. P (Tint i s))
  (fl:∀f. P (Tfloat f))
  (pt:∀s,t. P t → P (Tpointer s t))
  (ar:∀s,t,n. P t → P (Tarray s t n))
  (fn:∀tl,t. Q tl → P t → P (Tfunction tl t))
  (st:∀i,fl. P (Tstruct i fl))
  (un:∀i,fl. P (Tunion i fl))
  (cp:∀r,i. P (Tcomp_ptr r i))
  (nl:Q Tnil)
  (cs:∀t,tl. P t → Q tl → Q (Tcons t tl))
  (ts:typelist) on ts : Q ts ≝
  match ts return λts'.Q ts' with
  [ Tnil ⇒ nl
  | Tcons t tl ⇒ cs t tl (type_ind2l P Q vo it fl pt ar fn st un cp nl cs t)
                     (typelist_ind2l P Q vo it fl pt ar fn st un cp nl cs tl)
  ].

lemma assert_type_eq_true: ∀t. ∃p.assert_type_eq t t = OK ? p.
#t whd in ⊢ (??(λ_.??%?)); cases (type_eq_dec t t); #E
[ %{ E} //
| @False_ind @(absurd ?? E) //
] qed.

lemma alloc_vars_complete: ∀env,m,l,env',m'.
  alloc_variables env m l env' m' →
  exec_alloc_variables env m l = 〈env', m'〉.
#env #m #l #env' #m' #H elim H;
[ #env'' #m'' %
| #env1 #m1 #id #ty #l1 #m2 #loc #m3 #env2 #H1 #H2 #H3
  < H3 whd in H1:(??%?) ⊢ (??%?)
  < (pair_eq1 ?????? H1) < (pair_eq2 ?????? H1)
  @refl
] qed.

lemma bind_params_complete: ∀e,m,params,vs,m2.
  bind_parameters e m params vs m2 →
  yields ? (exec_bind_parameters e m params vs) m2.
#e #m #params #vs #m2 #H elim H;
[ //;
| #env1 #m1 #id #ty #l #v #tl #loc #m2 #m3 #H1 #H2 #H3 #H4
    whd in ⊢ (??%?)
    >H1 whd in ⊢ (??%?);
    >H2 whd in ⊢ (??%?);
    @H4
] qed.

lemma eventval_match_complete': ∀ev,ty,v.
  eventval_match ev ty v → yields ? (check_eventval' v ty) ev.
#ev #ty #v #H elim H; // #sz #sg #i whd in ⊢ (??%?) >eq_intsize_true @refl qed.

lemma eventval_list_match_complete: ∀vs,tys,evs.
  eventval_list_match evs tys vs → yields ? (check_eventval_list vs tys) evs.
#vs #tys #evs #H elim H;
[ //
| #e #etl #ty #tytl #v #vtl #H1 #H2 #H3 whd in ⊢ (??%?)
    >(yields_eq ??? (eventval_match_complete' … H1)) whd in ⊢ (??%?)
    >(yields_eq ??? H3) whd in ⊢ (??%?) //
] qed.

theorem step_complete: ∀ge,s,tr,s'.
  step ge s tr s' → yieldsIO ? (exec_step ge s) 〈tr,s'〉.
#ge #s #tr #s' #H elim H;
[ #f #e #e1 #k #e2 #m #loc #ofs #v #m' #tr1 #tr2 #H1 #H2 #H3 whd in ⊢ (??%?);
    >(yields_eq ??? (lvalue_complete … H1)) whd in ⊢ (??%?)
    >(yields_eq ??? (expr_complete … H2)) whd in ⊢ (??%?)
    change in H3:(??%?) with (store_value_of_type' (typeof e) m 〈loc,ofs〉 v)
    >H3 @refl
| #f #e #eargs #k #ef #m #vf #vargs #f' #tr1 #tr2 #H1 #H2 #H3 #H4 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? (exprlist_complete … H2)) whd in ⊢ (??%?);
    >H3 whd in ⊢ (??%?);
    >H4 elim (assert_type_eq_true (fun_typeof e)); #pty #ety >ety
    @refl
| #f #el #ef #eargs #k #env #m #loc #ofs #vf #vargs #f' #tr1 #tr2 #tr3 #H1 #H2 #H3 #H4 #H5 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H2)) whd in ⊢ (??%?);
    >(yields_eq ??? (exprlist_complete … H3)) whd in ⊢ (??%?);
    >H4 whd in ⊢ (??%?);
    >H5 elim (assert_type_eq_true (fun_typeof ef)); #pty #ety >ety
    whd in ⊢ (??%?);
    >(yields_eq ??? (lvalue_complete … H1)) whd in ⊢ (??%?);
    @refl
| #f #s1 #s2 #k #env #m @refl
| 5,6,7: #f #s #k #env #m @refl
| #f #e #s1 #s2 #k #env #m #v #tr #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_true ?? H2))
    @refl
| #f #e #s1 #s2 #k #env #m #v #tr #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_false ?? H2))
    @refl
| #f #e #s #k #env #m #v #tr #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_false ?? H2))
    @refl
| #f #e #s #k #env #m #v #tr #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_true ?? H2))
    @refl
| #f #s1 #e #s2 #k #env #m #H cases H; #es1 >es1 @refl
| 13,14: #f #e #s #k #env #m @refl
| #f #s1 #e #s2 #k #env #m #v #tr *; #es1 >es1 #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_false ?? H2))
    @refl
| #f #s1 #e #s2 #k #env #m #v #tr *; #es1 >es1 #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_true ?? H2))
    @refl
| #f #e #s #k #env #m @refl
| #f #s1 #e #s2 #s3 #k #env #m #nskip whd in ⊢ (??%?); cases (is_Sskip s1);
    [ #H @False_ind @(absurd ? H nskip)
    | #H whd in ⊢ (??%?); @refl ]
| #f #e #s1 #s2 #k #env #m #v #tr #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_false ?? H2))
    @refl
| #f #e #s1 #s2 #k #env #m #v #tr #H1 #H2 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    >(yields_eq ??? (bool_of_true ?? H2))
    @refl
| #f #s1 #e #s2 #s3 #k #env #m *; #es1 >es1 @refl
| 22,23: #f #e #s1 #s2 #k #env #m @refl
| #f #k #env #m #H whd in ⊢ (??%?); >H @refl
| #f #e #k #env #m #v #tr #H1 #H2 whd in ⊢ (??%?);
    @(dec_false ? (type_eq_dec (fn_return f) Tvoid) H1) #pf'
    whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H2)) whd in ⊢ (??%?);
    @refl
| #f #k #env #m cases k;
    [ #H1 #H2 whd in ⊢ (??%?); >H2 @refl
    | #s' #k' whd in ⊢ (% → ?); *;
    | 3,4: #e' #s' #k' whd in ⊢ (% → ?); *;
    | 5,6: #e' #s1' #s2' #k' whd in ⊢ (% → ?); *;
    | #k' whd in ⊢ (% → ?); *;
    | #r #f' #env' #k' #H1 #H2 whd in ⊢ (??%?); >H2 @refl
    ]
| #f #e #s #k #env #m #sz #i #tr #H1 whd in ⊢ (??%?);
    >(yields_eq ??? (expr_complete … H1)) whd in ⊢ (??%?);
    @refl
| #f #s #k #env #m *; #es >es @refl
| #f #k #env #m @refl
| #f #l #s #k #env #m @refl
| #f #l #k #env #m #s #k' #H1 whd in ⊢ (??%?); >H1 @refl
| #f #args #k #m1 #env #m2 #m3 #H1 #H2 whd in ⊢ (??%?);
    >(alloc_vars_complete … H1) whd in ⊢ (??%?);
    >(yields_eq ??? (bind_params_complete … H2))
    //
| #id #tys #rty #args #k #m #rv #tr #H whd in ⊢ (??%?);
    inversion H; #f' #args' #rv' #eargs #erv #H1 #H2 #e1 #e2 #e3 #e4 <e1 in H1 H2
    #H1 #H2
    >(yields_eq ??? (eventval_list_match_complete … H1)) whd in ⊢ (??%?);
    whd; inversion H2; [ #sz #sg #x | #x #sz ] #e5 #e6 #e7 %{ x} whd in ⊢ (??%?);
    @refl
| #v #f #env #k #m @refl
| #v #f #env #k #m1 #m2 #loc #ofs #ty
    change in ⊢ (??%? → ?) with (store_value_of_type' ty m1 〈loc,ofs〉 v)
    #H whd in ⊢ (??%?) >H @refl
| #f #l #s #k #env #m @refl
] qed.

lemma is_final_complete : ∀s,r. final_state s r → is_final s = Some ? r.
#s0 #r0 * #r #m @refl qed.