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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i $Id: closure.mli,v 1.42.2.1 2004/07/16 19:30:24 herbelin Exp $ i*)
(*i*)
open Pp
open Names
open Term
open Environ
open Esubst
(*i*)
(* Flags for profiling reductions. *)
val stats : bool ref
val share : bool ref
val with_stats: 'a Lazy.t -> 'a
(*s Delta implies all consts (both global (= by
[kernel_name]) and local (= by [Rel] or [Var])), all evars, and letin's.
Rem: reduction of a Rel/Var bound to a term is Delta, but reduction of
a LetIn expression is Letin reduction *)
type transparent_state = Idpred.t * KNpred.t
val all_opaque : transparent_state
val all_transparent : transparent_state
(* Sets of reduction kinds. *)
module type RedFlagsSig = sig
type reds
type red_kind
(* The different kind of reduction *)
(* Const/Var means the reference as argument should be unfolded *)
(* Constbut/Varbut means all references except the ones as argument
of Constbut/Varbut should be unfolded (there may be several such
Constbut/Varbut *)
val fBETA : red_kind
val fDELTA : red_kind
val fIOTA : red_kind
val fZETA : red_kind
val fCONST : constant -> red_kind
val fVAR : identifier -> red_kind
(* No reduction at all *)
val no_red : reds
(* Adds a reduction kind to a set *)
val red_add : reds -> red_kind -> reds
(* Removes a reduction kind to a set *)
val red_sub : reds -> red_kind -> reds
(* Adds a reduction kind to a set *)
val red_add_transparent : reds -> transparent_state -> reds
(* Build a reduction set from scratch = iter [red_add] on [no_red] *)
val mkflags : red_kind list -> reds
(* Tests if a reduction kind is set *)
val red_set : reds -> red_kind -> bool
(* Gives the constant list *)
val red_get_const : reds -> bool * evaluable_global_reference list
end
module RedFlags : RedFlagsSig
open RedFlags
val beta : reds
val betaiota : reds
val betadeltaiota : reds
val betaiotazeta : reds
val betadeltaiotanolet : reds
val unfold_red : evaluable_global_reference -> reds
(************************************************************************)
type table_key =
| ConstKey of constant
| VarKey of identifier
| FarRelKey of int
(* FarRel: index in the [rel_context] part of {\em initial} environment *)
type 'a infos
val ref_value_cache: 'a infos -> table_key -> 'a option
val info_flags: 'a infos -> reds
val create: ('a infos -> constr -> 'a) -> reds -> env -> 'a infos
(************************************************************************)
(*s A [stack] is a context of arguments, arguments are pushed by
[append_stack] one array at a time but popped with [decomp_stack]
one by one *)
type 'a stack_member =
| Zapp of 'a list
| Zcase of case_info * 'a * 'a array
| Zfix of 'a * 'a stack
| Zshift of int
| Zupdate of 'a
and 'a stack = 'a stack_member list
val empty_stack : 'a stack
val append_stack : 'a array -> 'a stack -> 'a stack
val decomp_stack : 'a stack -> ('a * 'a stack) option
val list_of_stack : 'a stack -> 'a list
val array_of_stack : 'a stack -> 'a array
val stack_assign : 'a stack -> int -> 'a -> 'a stack
val stack_args_size : 'a stack -> int
val app_stack : constr * constr stack -> constr
val stack_tail : int -> 'a stack -> 'a stack
val stack_nth : 'a stack -> int -> 'a
(************************************************************************)
(*s Lazy reduction. *)
(* [fconstr] is the type of frozen constr *)
type fconstr
(* [fconstr] can be accessed by using the function [fterm_of] and by
matching on type [fterm] *)
type fterm =
| FRel of int
| FAtom of constr (* Metas and Sorts *)
| FCast of fconstr * fconstr
| FFlex of table_key
| FInd of inductive
| FConstruct of constructor
| FApp of fconstr * fconstr array
| FFix of fixpoint * fconstr subs
| FCoFix of cofixpoint * fconstr subs
| FCases of case_info * fconstr * fconstr * fconstr array
| FLambda of int * (name * constr) list * constr * fconstr subs
| FProd of name * fconstr * fconstr
| FLetIn of name * fconstr * fconstr * constr * fconstr subs
| FEvar of existential_key * fconstr array
| FLIFT of int * fconstr
| FCLOS of constr * fconstr subs
| FLOCKED
(* To lazy reduce a constr, create a [clos_infos] with
[create_clos_infos], inject the term to reduce with [inject]; then use
a reduction function *)
val inject : constr -> fconstr
val fterm_of : fconstr -> fterm
val term_of_fconstr : fconstr -> constr
val destFLambda :
(fconstr subs -> constr -> fconstr) -> fconstr -> name * fconstr * fconstr
(* Global and local constant cache *)
type clos_infos
val create_clos_infos : reds -> env -> clos_infos
(* Reduction function *)
(* [norm_val] is for strong normalization *)
val norm_val : clos_infos -> fconstr -> constr
(* [whd_val] is for weak head normalization *)
val whd_val : clos_infos -> fconstr -> constr
(* [whd_stack] performs weak head normalization in a given stack. It
stops whenever a reduction is blocked. *)
val whd_stack :
clos_infos -> fconstr -> fconstr stack -> fconstr * fconstr stack
(* Conversion auxiliary functions to do step by step normalisation *)
(* [unfold_reference] unfolds references in a [fconstr] *)
val unfold_reference : clos_infos -> table_key -> fconstr option
(* [mind_equiv] checks whether two mutual inductives are intentionally equal *)
val mind_equiv : clos_infos -> mutual_inductive -> mutual_inductive -> bool
(************************************************************************)
(*i This is for lazy debug *)
val lift_fconstr : int -> fconstr -> fconstr
val lift_fconstr_vect : int -> fconstr array -> fconstr array
val mk_clos : fconstr subs -> constr -> fconstr
val mk_clos_vect : fconstr subs -> constr array -> fconstr array
val mk_clos_deep :
(fconstr subs -> constr -> fconstr) ->
fconstr subs -> constr -> fconstr
val kni: clos_infos -> fconstr -> fconstr stack -> fconstr * fconstr stack
val knr: clos_infos -> fconstr -> fconstr stack -> fconstr * fconstr stack
val kl : clos_infos -> fconstr -> constr
val to_constr : (lift -> fconstr -> constr) -> lift -> fconstr -> constr
val optimise_closure : fconstr subs -> constr -> fconstr subs * constr
(* End of cbn debug section i*)
|
