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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015 *)
(* \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;
var_trstate : Id.Pred.t;
cst_trstate : Cpred.t;
}
let empty = {
var_opacity = Id.Map.empty;
cst_opacity = Cmap.empty;
var_trstate = Id.Pred.full;
cst_trstate = Cpred.full;
}
let get_strategy { var_opacity; cst_opacity } f = function
| VarKey id ->
(try Id.Map.find id var_opacity
with Not_found -> default)
| ConstKey c ->
(try Cmap.find (f 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 ->
let var_opacity =
if is_default l then Id.Map.remove id var_opacity
else Id.Map.add id l var_opacity
in
let var_trstate = match l with
| Opaque -> Id.Pred.remove id oracle.var_trstate
| _ -> Id.Pred.add id oracle.var_trstate
in
{ oracle with var_opacity; var_trstate; }
| ConstKey c ->
let cst_opacity =
if is_default l then Cmap.remove c cst_opacity
else Cmap.add c l cst_opacity
in
let cst_trstate = match l with
| Opaque -> Cpred.remove c oracle.cst_trstate
| _ -> Cpred.add c oracle.cst_trstate
in
{ oracle with cst_opacity; cst_trstate; }
| RelKey _ -> Errors.error "set_strategy: RelKey"
let fold_strategy f { var_opacity; cst_opacity; } accu =
let fvar id lvl accu = f (VarKey id) lvl accu in
let fcst cst lvl accu = f (ConstKey cst) lvl accu in
let accu = Id.Map.fold fvar var_opacity accu in
Cmap.fold fcst cst_opacity accu
let get_transp_state { var_trstate; cst_trstate } = (var_trstate, cst_trstate)
(* 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 f o l2r k1 k2 =
match get_strategy o f k1, get_strategy o f k2 with
| Expand, _ -> true
| Level n1, Opaque -> true
| Level n1, Level n2 -> n1 < n2
| _ -> l2r (* use recommended default *)
let get_strategy o = get_strategy o (fun x -> x)
|
