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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(* Created by Bruno Barras as part of the rewriting of the conversion
algorithm, Nov 2001 *)
open Names
(* Priority for the expansion of constant in the conversion test.
* Higher levels means that the expansion is less prioritary.
* (And Expand stands for -oo, and Opaque +oo.)
* The default value is [Level 100].
*)
type level = Expand | Level of int | Opaque
let default = Level 0
let transparent = default
type oracle = level Idmap.t * level Cmap.t
let var_opacity = ref Idmap.empty
let cst_opacity = ref Cmap.empty
let get_strategy = function
| VarKey id ->
(try Idmap.find id !var_opacity
with Not_found -> default)
| ConstKey c ->
(try Cmap.find c !cst_opacity
with Not_found -> default)
| RelKey _ -> Expand
let set_strategy k l =
match k with
| VarKey id ->
var_opacity :=
if l=default then Idmap.remove id !var_opacity
else Idmap.add id l !var_opacity
| ConstKey c ->
cst_opacity :=
if l=default then Cmap.remove c !cst_opacity
else Cmap.add c l !cst_opacity
| RelKey _ -> Errors.error "set_strategy: RelKey"
let get_transp_state () =
(Idmap.fold
(fun id l ts -> if l=Opaque then Idpred.remove id ts else ts)
!var_opacity Idpred.full,
Cmap.fold
(fun c l ts -> if l=Opaque then Cpred.remove c ts else ts)
!cst_opacity Cpred.full)
(* Unfold the first constant only if it is "more transparent" than the
second one. In case of tie, expand the second one. *)
let oracle_order l2r k1 k2 =
match get_strategy k1, get_strategy k2 with
| Expand, _ -> true
| Level n1, Opaque -> true
| Level n1, Level n2 -> n1 < n2
| _ -> l2r (* use recommended default *)
(* summary operations *)
let init() = (cst_opacity := Cmap.empty; var_opacity := Idmap.empty)
let freeze () = (!var_opacity, !cst_opacity)
let unfreeze (vo,co) = (cst_opacity := co; var_opacity := vo)
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