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+(************************************************************************)
+(*  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: decls.ml 10841 2008-04-24 07:19:57Z herbelin $ *)
+
+(** This module registers tables for some non-logical informations
+     associated declarations *)
+
+open Names
+open Term
+open Sign
+open Decl_kinds
+open Libnames
+
+(** Datas associated to section variables and local definitions *)
+
+type variable_data =
+    dir_path * bool (* opacity *) * Univ.constraints * logical_kind
+
+let vartab = ref (Idmap.empty : variable_data Idmap.t)
+
+let _ = Summary.declare_summary "VARIABLE"
+  { Summary.freeze_function = (fun () -> !vartab);
+    Summary.unfreeze_function = (fun ft -> vartab := ft);
+    Summary.init_function = (fun () -> vartab := Idmap.empty);
+    Summary.survive_module = false;
+    Summary.survive_section = false }
+
+let add_variable_data id o = vartab := Idmap.add id o !vartab
+
+let variable_path id = let (p,_,_,_) = Idmap.find id !vartab in p
+let variable_opacity id = let (_,opaq,_,_) = Idmap.find id !vartab in opaq
+let variable_kind id = let (_,_,_,k) = Idmap.find id !vartab in k
+let variable_constraints id = let (_,_,cst,_) = Idmap.find id !vartab in cst
+
+let variable_exists id = Idmap.mem id !vartab
+
+(** Datas associated to global parameters and constants *)
+
+let csttab = ref (Cmap.empty : logical_kind Cmap.t)
+
+let _ = Summary.declare_summary "CONSTANT"
+	  { Summary.freeze_function = (fun () -> !csttab);
+	    Summary.unfreeze_function = (fun ft -> csttab := ft);
+	    Summary.init_function = (fun () -> csttab := Cmap.empty);
+	    Summary.survive_module = false;
+	    Summary.survive_section = false }
+
+let add_constant_kind kn k = csttab := Cmap.add kn k !csttab
+
+let constant_kind kn = Cmap.find kn !csttab
+
+(** Miscellaneous functions. *)
+
+let clear_proofs sign =
+  List.fold_right
+    (fun (id,c,t as d) signv -> 
+      let d = if variable_opacity id then (id,None,t) else d in
+      Environ.push_named_context_val d signv) sign Environ.empty_named_context_val
+
+let last_section_hyps dir =
+  fold_named_context
+    (fun (id,_,_) sec_ids ->
+      try if dir=variable_path id then id::sec_ids else sec_ids
+      with Not_found -> sec_ids)
+    (Environ.named_context (Global.env()))
+    ~init:[]
+
+let is_section_variable = function
+  | VarRef _ -> true
+  | _ -> false