From 3ef7797ef6fc605dfafb32523261fe1b023aeecb Mon Sep 17 00:00:00 2001
From: Samuel Mimram <smimram@debian.org>
Date: Fri, 28 Apr 2006 14:59:16 +0000
Subject: Imported Upstream version 8.0pl3+8.1alpha

---
 proofs/redexpr.ml | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 proofs/redexpr.ml

(limited to 'proofs/redexpr.ml')

diff --git a/proofs/redexpr.ml b/proofs/redexpr.ml
new file mode 100644
index 00000000..8b3b5f5f
--- /dev/null
+++ b/proofs/redexpr.ml
@@ -0,0 +1,112 @@
+(************************************************************************)
+(*  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        *)
+(************************************************************************)
+
+(* $Id: redexpr.ml 7639 2005-12-02 10:01:15Z gregoire $ *)
+
+open Pp
+open Util
+open Names
+open Term
+open Declarations
+open Libnames
+open Rawterm
+open Reductionops
+open Tacred
+open Closure
+open RedFlags
+
+
+(* call by value normalisation function using the virtual machine *)
+let cbv_vm env _ c =
+  let ctyp = (fst (Typeops.infer env c)).Environ.uj_type in
+  Vconv.cbv_vm env c ctyp
+
+
+let set_opaque_const sp = 
+  Conv_oracle.set_opaque_const sp;
+  Csymtable.set_opaque_const sp
+
+let set_transparent_const sp =
+  let cb = Global.lookup_constant sp in
+  if cb.const_body <> None & cb.const_opaque then
+    errorlabstrm "set_transparent_const"
+      (str "Cannot make" ++ spc () ++ 
+         Nametab.pr_global_env Idset.empty (ConstRef sp) ++
+         spc () ++ str "transparent because it was declared opaque.");
+  Conv_oracle.set_transparent_const sp;
+  Csymtable.set_transparent_const sp
+
+let set_opaque_var      = Conv_oracle.set_opaque_var
+let set_transparent_var = Conv_oracle.set_transparent_var
+
+let _ = 
+  Summary.declare_summary "Transparent constants and variables"
+    { Summary.freeze_function = Conv_oracle.freeze;
+      Summary.unfreeze_function = Conv_oracle.unfreeze;
+      Summary.init_function = Conv_oracle.init;
+      Summary.survive_module = false;
+      Summary.survive_section = false }
+
+
+(* Generic reduction: reduction functions used in reduction tactics *)
+
+type red_expr = (constr, evaluable_global_reference) red_expr_gen
+
+
+let make_flag_constant = function
+  | EvalVarRef id -> fVAR id
+  | EvalConstRef sp -> fCONST sp
+
+let make_flag f =
+  let red = no_red in
+  let red = if f.rBeta then red_add red fBETA else red in
+  let red = if f.rIota then red_add red fIOTA else red in
+  let red = if f.rZeta then red_add red fZETA else red in
+  let red =
+    if f.rDelta then (* All but rConst *)
+        let red = red_add red fDELTA in
+        let red = red_add_transparent red (Conv_oracle.freeze ()) in
+	List.fold_right
+	  (fun v red -> red_sub red (make_flag_constant v))
+	  f.rConst red
+    else (* Only rConst *)
+        let red = red_add_transparent (red_add red fDELTA) all_opaque in
+	List.fold_right
+	  (fun v red -> red_add red (make_flag_constant v))
+	  f.rConst red
+  in red
+
+let is_reference c = 
+  try let _ref = global_of_constr c in true with _ -> false
+
+let red_expr_tab = ref Stringmap.empty
+
+let declare_red_expr s f =
+  try 
+    let _ = Stringmap.find s !red_expr_tab in
+    error ("There is already a reduction expression of name "^s)
+  with Not_found ->
+    red_expr_tab := Stringmap.add s f !red_expr_tab
+
+let reduction_of_red_expr = function
+  | Red internal -> 
+      if internal then (try_red_product,DEFAULTcast) 
+      else (red_product,DEFAULTcast)
+  | Hnf -> (hnf_constr,DEFAULTcast)
+  | Simpl (Some (_,c as lp)) -> 
+      (contextually (is_reference c) lp nf,DEFAULTcast)
+  | Simpl None -> (nf,DEFAULTcast)
+  | Cbv f -> (cbv_norm_flags (make_flag f),DEFAULTcast)
+  | Lazy f -> (clos_norm_flags (make_flag f),DEFAULTcast)
+  | Unfold ubinds -> (unfoldn ubinds,DEFAULTcast)
+  | Fold cl -> (fold_commands cl,DEFAULTcast)
+  | Pattern lp -> (pattern_occs lp,DEFAULTcast)
+  | ExtraRedExpr s ->
+      (try (Stringmap.find s !red_expr_tab,DEFAULTcast)
+      with Not_found -> error("unknown user-defined reduction \""^s^"\""))
+  | CbvVm -> (cbv_vm ,VMcast)
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