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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 is_default = function
| Level 0 -> true
| _ -> false
let transparent = default
let is_transparent = function
| Level 0 -> true
| _ -> false
type oracle = {
var_opacity : level Id.Map.t;
cst_opacity : level Cmap.t
}
let empty = { var_opacity = Id.Map.empty; cst_opacity = Cmap.empty }
let get_strategy { var_opacity; cst_opacity } = function
| VarKey id ->
(try Id.Map.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 ({ var_opacity; cst_opacity } as oracle) k l =
match k with
| VarKey id ->
{ oracle with var_opacity =
if is_default l then Id.Map.remove id var_opacity
else Id.Map.add id l var_opacity }
| ConstKey c ->
{ oracle with cst_opacity =
if is_default l then Cmap.remove c cst_opacity
else Cmap.add c l cst_opacity }
| RelKey _ -> Errors.error "set_strategy: RelKey"
let get_transp_state { var_opacity; cst_opacity } =
(Id.Map.fold
(fun id l ts -> if l=Opaque then Id.Pred.remove id ts else ts)
var_opacity Id.Pred.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 o l2r k1 k2 =
match get_strategy o k1, get_strategy o k2 with
| Expand, _ -> true
| Level n1, Opaque -> true
| Level n1, Level n2 -> n1 < n2
| _ -> l2r (* use recommended default *)
|
