type env_term
type config = int * env_term list * C.term * stack_term list
val to_env :
- reduce: (config -> config) -> unwind: (config -> C.term) ->
+ reduce: (config -> config * bool) -> unwind: (config -> C.term) ->
config -> env_term
val from_stack : stack_term -> config
val from_stack_list_for_unwind :
val from_env_for_unwind :
unwind: (config -> C.term) -> env_term -> C.term
val stack_to_env :
- reduce: (config -> config) -> unwind: (config -> C.term) ->
+ reduce: (config -> config * bool) -> unwind: (config -> C.term) ->
stack_term -> env_term
val compute_to_env :
- reduce: (config -> config) -> unwind: (config -> C.term) ->
+ reduce: (config -> config * bool) -> unwind: (config -> C.term) ->
int -> env_term list -> C.term -> env_term
val compute_to_stack :
- reduce: (config -> config) -> unwind: (config -> C.term) ->
+ reduce: (config -> config * bool) -> unwind: (config -> C.term) ->
config -> stack_term
end
;;
type config = int * env_term list * C.term * stack_term list
and stack_term = config lazy_t * C.term lazy_t (* cbv, cbn *)
and env_term = config lazy_t * C.term lazy_t (* cbv, cbn *)
- let to_env ~reduce ~unwind c = lazy (reduce c),lazy (unwind c)
+ let to_env ~reduce ~unwind c = lazy (fst (reduce c)),lazy (unwind c)
let from_stack (c,_) = Lazy.force c
let from_stack_list_for_unwind ~unwind:_ l =
List.map (function (_,c) -> Lazy.force c) l
let from_env_for_unwind ~unwind:_ (_,c) = Lazy.force c
let stack_to_env ~reduce:_ ~unwind:_ config = config
let compute_to_env ~reduce ~unwind k e t =
- lazy (reduce (k,e,t,[])), lazy (unwind (k,e,t,[]))
+ lazy (fst (reduce (k,e,t,[]))), lazy (unwind (k,e,t,[]))
let compute_to_stack ~reduce ~unwind config =
- lazy (reduce config), lazy (unwind config)
+ lazy (fst (reduce config)), lazy (unwind config)
end
;;
| _,_ -> assert false
;;
- let rec reduce ~delta ?(subst = []) context : config -> config =
+ let rec reduce ~delta ?(subst = []) context : config -> config * bool =
let rec aux = function
| k, e, C.Rel n, s when n <= k ->
let k',e',t',s' = RS.from_env (list_nth e (n-1)) in
let x= try Some (List.nth context (n - 1 - k)) with Failure _ -> None in
(match x with
| Some(_,C.Def(x,_)) -> aux (0,[],NCicSubstitution.lift (n - k) x,s)
- | _ -> config)
+ | _ -> config, true)
| (k, e, C.Meta (n,l), s) as config ->
(try
let _,_, term,_ = NCicUtils.lookup_subst n subst in
aux (k, e, NCicSubstitution.subst_meta l term,s)
- with NCicUtils.Subst_not_found _ -> config)
+ with NCicUtils.Subst_not_found _ -> config, true)
| (_, _, C.Implicit _, _) -> assert false
| (_, _, C.Sort _, _)
| (_, _, C.Prod _, _)
- | (_, _, C.Lambda _, []) as config -> config
+ | (_, _, C.Lambda _, []) as config -> config, true
| (k, e, C.Lambda (_,_,t), p::s) ->
aux (k+1, (RS.stack_to_env ~reduce:aux ~unwind p)::e, t,s)
| (k, e, C.LetIn (_,_,m,t), s) ->
aux (k, e, he, tl' @ s)
| (_, _, C.Const
(Ref.Ref (_,Ref.Def height) as refer), s) as config ->
- if delta >= height then config else
+ if delta >= height then config, false else
let _,_,body,_,_,_ = NCicEnvironment.get_checked_def refer in
aux (0, [], body, s)
| (_, _, C.Const (Ref.Ref (_,
- (Ref.Decl|Ref.Ind _|Ref.Con _|Ref.CoFix _))), _) as config -> config
- | (_, _, C.Const (Ref.Ref
- (_,Ref.Fix (fixno,recindex,height)) as refer),s) as config ->
- if delta >= height then config else
+ (Ref.Decl|Ref.Ind _|Ref.Con _|Ref.CoFix _))), _) as config ->
+ config, true
+ | (_, _, (C.Const (Ref.Ref
+ (_,Ref.Fix (fixno,recindex,height)) as refer) as head),s) as config ->
+(* if delta >= height then config else *)
(match
try Some (RS.from_stack (List.nth s recindex))
with Failure _ -> None
with
- | None -> config
+ | None -> config, true
| Some recparam ->
let fixes,_,_ = NCicEnvironment.get_checked_fixes_or_cofixes refer in
match reduce ~delta:0 ~subst context recparam with
- | (_,_,C.Const (Ref.Ref (_,Ref.Con _)), _) as c ->
+ | (_,_,C.Const (Ref.Ref (_,Ref.Con _)), _) as c, _
+ when delta >= height ->
+ let new_s =
+ replace recindex s (RS.compute_to_stack ~reduce:aux ~unwind c)
+ in
+ (0, [], head, new_s), false
+ | (_,_,C.Const (Ref.Ref (_,Ref.Con _)), _) as c, _ ->
let new_s =
replace recindex s (RS.compute_to_stack ~reduce:aux ~unwind c)
in
let _,_,_,_,body = List.nth fixes fixno in
aux (0, [], body, new_s)
- | _ -> config)
+ | _ -> config, true)
| (k, e, C.Match (_,_,term,pl),s) as config ->
let decofix = function
| (_,_,C.Const(Ref.Ref(_,Ref.CoFix c)as refer),s)->
- let cofixes,_,_ = NCicEnvironment.get_checked_fixes_or_cofixes refer in
+ let cofixes,_,_ =
+ NCicEnvironment.get_checked_fixes_or_cofixes refer in
let _,_,_,_,body = List.nth cofixes c in
- reduce ~delta:0 ~subst context (0,[],body,s)
+ let c,_ = reduce ~delta:0 ~subst context (0,[],body,s) in
+ c
| config -> config
in
- (match decofix (reduce ~delta:0 ~subst context (k,e,term,[])) with
+ (match decofix (fst (reduce ~delta:0 ~subst context (k,e,term,[]))) with
| (_, _, C.Const (Ref.Ref (_,Ref.Con (_,j,_))),[]) ->
aux (k, e, List.nth pl (j-1), s)
| (_, _, C.Const (Ref.Ref (_,Ref.Con (_,j,lno))), s')->
let _,params = HExtlib.split_nth lno s' in
aux (k, e, List.nth pl (j-1), params@s)
- | _ -> config)
+ | _ -> config,true)
in
aux
;;
let whd ?(delta=0) ?(subst=[]) context t =
- unwind (reduce ~delta ~subst context (0, [], t, []))
+ unwind (fst (reduce ~delta ~subst context (0, [], t, [])))
;;
end
| C.Appl(C.Const(Ref.Ref(_,Ref.Fix (_,_,h)))::_) -> h
| _ -> 0
in
- let small_delta_step (_,_,t1,_ as m1) (_,_,t2,_ as m2) =
- let h1 = height_of t1 in
- let h2 = height_of t2 in
- let delta = if h1 = h2 then max 0 (h1 -1) else min h1 h2 in
- R.reduce ~delta ~subst context m1,
- R.reduce ~delta ~subst context m2,
- delta
+ let put_in_whd m1 m2 =
+ R.reduce ~delta:max_int ~subst context m1,
+ R.reduce ~delta:max_int ~subst context m2
+ in
+ let small_delta_step
+ ((_,_,t1,_ as m1), norm1 as x1) ((_,_,t2,_ as m2), norm2 as x2)
+ =
+ assert(not (norm1 && norm2));
+ if norm1 then
+ x1, R.reduce ~delta:(height_of t2 -1) ~subst context m2
+ else if norm2 then
+ R.reduce ~delta:(height_of t1 -1) ~subst context m1, x2
+ else
+ let h1 = height_of t1 in
+ let h2 = height_of t2 in
+ let delta = if h1 = h2 then max 0 (h1 -1) else min h1 h2 in
+ R.reduce ~delta ~subst context m1,
+ R.reduce ~delta ~subst context m2
in
- let rec convert_machines ((k1,e1,t1,s1 as m1),(k2,e2,t2,s2 as m2),delta) =
+ let rec convert_machines
+ ((k1,e1,t1,s1),norm1 as m1),((k2,e2,t2,s2), norm2 as m2)
+ =
(alpha_eq test_eq_only
(R.unwind (k1,e1,t1,[])) (R.unwind (k2,e2,t2,[])) &&
let relevance =
not b ||
let t1 = RS.from_stack t1 in
let t2 = RS.from_stack t2 in
- convert_machines (small_delta_step t1 t2)) s1 s2 true relevance
+ convert_machines (put_in_whd t1 t2)) s1 s2 true relevance
with Invalid_argument _ -> false) ||
- (delta > 0 &&
- let delta = delta - 1 in
- let red = R.reduce ~delta ~subst context in
- convert_machines (red m1,red m2,delta))
+ (not (norm1 && norm2) && convert_machines (small_delta_step m1 m2))
in
- convert_machines (small_delta_step (0,[],t1,[]) (0,[],t2,[]))
+ convert_machines (put_in_whd (0,[],t1,[]) (0,[],t2,[]))
in
aux false
;;
projects / helm.git / blobdiff