1 files changed, 73 insertions, 0 deletions
diff --git a/library/summary.ml b/library/summary.ml
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index 00000000..fc88350a
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+++ b/library/summary.ml
@@ -0,0 +1,73 @@
+(************************************************************************)
+(*  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: summary.ml,v 1.7.2.1 2004/07/16 19:30:36 herbelin Exp $ *)
+
+open Pp
+open Util
+
+type 'a summary_declaration = {
+  freeze_function : unit -> 'a;
+  unfreeze_function : 'a -> unit;
+  init_function : unit -> unit;
+  survive_module : bool ;
+  survive_section : bool }
+
+let summaries = 
+  (Hashtbl.create 17 : (string, Dyn.t summary_declaration) Hashtbl.t)
+
+let internal_declare_summary sumname sdecl =
+  let (infun,outfun) = Dyn.create sumname in
+  let dyn_freeze () = infun (sdecl.freeze_function())
+  and dyn_unfreeze sum = sdecl.unfreeze_function (outfun sum)
+  and dyn_init = sdecl.init_function in
+  let ddecl = {
+    freeze_function = dyn_freeze;
+    unfreeze_function = dyn_unfreeze;
+    init_function = dyn_init;
+    survive_module = sdecl.survive_module;
+    survive_section = sdecl.survive_section } 
+  in
+  if Hashtbl.mem summaries sumname then
+    anomalylabstrm "Summary.declare_summary"
+      (str "Cannot declare a summary twice: " ++ str sumname);
+  Hashtbl.add summaries sumname ddecl
+
+let declare_summary sumname decl = 
+  internal_declare_summary (sumname^"-SUMMARY") decl
+
+type frozen = Dyn.t Stringmap.t
+
+let freeze_summaries () =
+  let m = ref Stringmap.empty in
+  Hashtbl.iter 
+    (fun id decl -> m := Stringmap.add id (decl.freeze_function()) !m)
+    summaries;
+  !m
+
+
+let unfreeze_some_summaries p fs = 
+  Hashtbl.iter
+    (fun id decl -> 
+       try 
+	 if p decl then
+	   decl.unfreeze_function (Stringmap.find id fs)
+       with Not_found -> decl.init_function())
+    summaries
+
+let unfreeze_summaries = 
+  unfreeze_some_summaries (fun _ -> true)
+
+let section_unfreeze_summaries =
+  unfreeze_some_summaries (fun decl -> not decl.survive_section)
+
+let module_unfreeze_summaries =
+  unfreeze_some_summaries (fun decl -> not decl.survive_module)
+
+let init_summaries () =
+  Hashtbl.iter (fun _ decl -> decl.init_function()) summaries