From 7cfc4e5146be5666419451bdd516f1f3f264d24a Mon Sep 17 00:00:00 2001
From: Enrico Tassi <gareuselesinge@debian.org>
Date: Sun, 25 Jan 2015 14:42:51 +0100
Subject: Imported Upstream version 8.5~beta1+dfsg

---
 kernel/conv_oracle.ml | 80 +++++++++++++++++++++++++++++++++------------------
 1 file changed, 52 insertions(+), 28 deletions(-)

(limited to 'kernel/conv_oracle.ml')

diff --git a/kernel/conv_oracle.ml b/kernel/conv_oracle.ml
index 26b7a397..3b01538b 100644
--- a/kernel/conv_oracle.ml
+++ b/kernel/conv_oracle.ml
@@ -1,6 +1,6 @@
 (************************************************************************)
 (*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
-(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2014     *)
+(* <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        *)
@@ -18,52 +18,76 @@ open Names
  *)
 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 = level Idmap.t * level Cmap.t
+type oracle = {
+  var_opacity : level Id.Map.t;
+  cst_opacity : level Cmap.t;
+  var_trstate : Id.Pred.t;
+  cst_trstate : Cpred.t;
+}
 
-let var_opacity = ref Idmap.empty
-let cst_opacity = ref Cmap.empty
+let empty = {
+  var_opacity = Id.Map.empty;
+  cst_opacity = Cmap.empty;
+  var_trstate = Id.Pred.full;
+  cst_trstate = Cpred.full;
+}
 
-let get_strategy = function
+let get_strategy { var_opacity; cst_opacity } f = function
   | VarKey id ->
-      (try Idmap.find id !var_opacity
+      (try Id.Map.find id var_opacity
       with Not_found -> default)
   | ConstKey c ->
-      (try Cmap.find c !cst_opacity
+      (try Cmap.find (f c) cst_opacity
       with Not_found -> default)
   | RelKey _ -> Expand
 
-let set_strategy k l =
+let set_strategy ({ var_opacity; cst_opacity } as oracle) 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
+    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 ->
-      cst_opacity :=
-      if l=default then Cmap.remove c !cst_opacity
-      else Cmap.add c l !cst_opacity
-  | RelKey _ -> Util.error "set_strategy: RelKey"
+    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 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)
+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 l2r k1 k2 =
-  match get_strategy k1, get_strategy k2 with
+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 *)
 
-(* 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)
+let get_strategy o = get_strategy o (fun x -> x)
-- 
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