diff -ru frama-c-Lithium-20081201/Makefile.in frama-c-states_hook/Makefile.in
--- frama-c-Lithium-20081201/Makefile.in	2008-12-16 10:29:49.000000000 +0100
+++ frama-c-states_hook/Makefile.in	2009-01-17 18:44:46.000000000 +0100
@@ -857,6 +857,7 @@
 	src/memory_state/memzone_type.cmo \
 	src/memory_state/widen_type.cmo \
 	src/memory_state/relations_type.cmo \
+	src/memory_state/state_set.cmo \
 	src/logic/why_output.cmo
 
 ACMX = $(ACMO:.cmo=.cmx)
@@ -1023,7 +1024,7 @@
 PLUGIN_ENABLE:=@ENABLE_VALUE@
 PLUGIN_NAME:=Value
 PLUGIN_DIR:=src/value
-PLUGIN_CMO:= state_set kf_state eval kinstr register
+PLUGIN_CMO:= kf_state eval kinstr register
 PLUGIN_GUI_CMO:=register_gui
 PLUGIN_HAS_MLI:=yes
 PLUGIN_GUI_HAS_MLI:=yes
diff -ru frama-c-Lithium-20081201/src/kernel/db.ml frama-c-states_hook/src/kernel/db.ml
--- frama-c-Lithium-20081201/src/kernel/db.ml	2008-12-16 10:29:48.000000000 +0100
+++ frama-c-states_hook/src/kernel/db.ml	2009-01-17 18:22:38.000000000 +0100
@@ -257,6 +257,12 @@
 	 type t = (kernel_function * kinstr) list * state InstrHashtbl.t
        end)
 
+  module Record_Value_Superposition_Callbacks =
+    Hook.Build
+      (struct
+	 type t = (kernel_function * kinstr) list * State_set.t InstrHashtbl.t
+       end)
+
   module Call_Value_Callbacks =
     Hook.Build
       (struct type t = state * (Db_types.kernel_function * kinstr) list end)
diff -ru frama-c-Lithium-20081201/src/kernel/db.mli frama-c-states_hook/src/kernel/db.mli
--- frama-c-Lithium-20081201/src/kernel/db.mli	2008-12-16 10:29:48.000000000 +0100
+++ frama-c-states_hook/src/kernel/db.mli	2009-01-17 18:23:57.000000000 +0100
@@ -248,6 +248,9 @@
   module Record_Value_Callbacks:
     Hook.S with type param = (kernel_function * kinstr) list 
     * state Cilutil.InstrHashtbl.t
+  module Record_Value_Superposition_Callbacks:
+    Hook.S with type param = (kernel_function * kinstr) list 
+    * State_set.t Cilutil.InstrHashtbl.t
 
   (** Actions to perform at each treatment of a "call" statement. 
       @plugin development guide *)
diff -ru frama-c-Lithium-20081201/src/value/eval.ml frama-c-states_hook/src/value/eval.ml
--- frama-c-Lithium-20081201/src/value/eval.ml	2008-12-16 10:29:49.000000000 +0100
+++ frama-c-states_hook/src/value/eval.ml	2009-01-17 18:21:06.000000000 +0100
@@ -2526,8 +2526,26 @@
     (*Format.printf "Done Merging current@.";*)
 
     if not degenerate &&
-      not (Db.Value.Record_Value_Callbacks.is_empty ())
+      ((not (Db.Value.Record_Value_Callbacks.is_empty ())) || 
+      (not (Db.Value.Record_Value_Superposition_Callbacks.is_empty ())))
     then begin
+    	let stack_for_callbacks = for_callbacks_stack () in
+
+	if not (Db.Value.Record_Value_Callbacks.is_empty ())
+	then begin
+	let current_superpositions = InstrHashtbl.create 17 in
+	InstrHashtbl.iter
+	  (fun k record ->
+	    InstrHashtbl.add current_superpositions k record.superposition)
+	  current_table;
+
+(* 	Format.printf "[values] now calling Record_Value_Superposition callbacks@."; *)
+	Db.Value.Record_Value_Superposition_Callbacks.apply
+	  (stack_for_callbacks, current_superpositions);
+
+        end ;
+	if not (Db.Value.Record_Value_Callbacks.is_empty ())
+	then begin
 (* 	Format.printf "[values] now calling Record_Value callbacks@."; *)
 
 	let current_states = InstrHashtbl.create 17 in
@@ -2537,7 +2555,8 @@
 	  current_table;
 
 	Db.Value.Record_Value_Callbacks.apply
-	  ((for_callbacks_stack ()), current_states);
+	  (stack_for_callbacks, current_states);
+         end	  
       end;
     InstrHashtbl.clear current_table;