Maintain the set of unsatisfiable states.

[tatoo.git] / src / eval.ml

diff --git a/src/eval.ml b/src/eval.ml
index 5ebd1ec..8f8652e 100644 (file)
--- a/src/eval.ml
+++ b/src/eval.ml
@@ -14,7 +14,7 @@
 (***********************************************************************)
 
 (*
-  Time-stamp: <Last modified on 2013-04-15 17:50:33 CEST by Kim Nguyen>
+  Time-stamp: <Last modified on 2013-04-18 17:36:06 CEST by Kim Nguyen>
 *)
 
 INCLUDE "utils.ml"
@@ -50,12 +50,20 @@ END
         let fc = T.first_child tree node in
         let ns = T.next_sibling tree node in
         let tag = T.tag tree node in
-        let states0 = get cache tree node in
-        let trans0 = Ata.get_trans auto tag auto.Ata.states in
+        let config0 =
+          let c = get cache tree node in
+          if c == Cache.N1.dummy cache then
+            { c with Ata.todo = Ata.get_trans auto tag auto.Ata.states }
+          else c
+        in
+
         let () =
-          TRACE(Html.trace (T.preorder tree node) _i "Pre States: %a<br/>Pre Trans: %a<br/>"
-                  StateSet.print states0 (Ata.TransList.print ~sep:"<br/>") trans0)
+          TRACE(Html.trace (T.preorder tree node) _i "Config0<br/>sat: %a<br/>unsat: %a<br/>todo: %a<br/>"
+                  StateSet.print config0.Ata.sat
+                  StateSet.print config0.Ata.unsat
+                  (Ata.TransList.print ~sep:"<br/>") config0.Ata.todo)
         in
+
         let ps = get cache tree parent in
         let fcs = get cache tree fc in
         let nss = get cache tree ns in
@@ -65,41 +73,51 @@ END
         and has_right = ns != T.nil
         and kind = T.kind tree node
         in
-        let trans1, states1 =
-          Ata.eval_trans auto trans0
-            fcs nss ps states0
+        let config1 =
+          Ata.eval_trans2 auto fcs nss ps config0
             is_left is_right has_left has_right kind
         in
         let () =
-          TRACE(Html.trace (T.preorder tree node) _i "TD States: %a<br/>TD Trans: %a<br/>" StateSet.print states1 (Ata.TransList.print ~sep:"<br/>") trans1)
+          TRACE(Html.trace (T.preorder tree node) _i "Config1<br/>sat: %a<br/>unsat: %a<br/>todo: %a<br/>"
+                  StateSet.print config1.Ata.sat
+                  StateSet.print config1.Ata.unsat
+                  (Ata.TransList.print ~sep:"<br/>") config1.Ata.todo)
         in
-        if states1 != states0 then set cache tree node states1;
+        if not (Ata.eq_config config0 config1) then set cache tree node config1;
         let () = loop fc in
         let fcs1 = get cache tree fc in
-        let trans2, states2 =
-          Ata.eval_trans auto trans1
-            fcs1 nss ps states1
+        let config2 =
+          Ata.eval_trans2 auto
+            fcs1 nss ps config1
             is_left is_right has_left has_right kind
         in
         let () =
-          TRACE(Html.trace (T.preorder tree node) _i "Left BU States: %a<br/>Left BU Trans: %a<br/>" StateSet.print states2 (Ata.TransList.print ~sep:"<br/>") trans2)
+          TRACE(Html.trace (T.preorder tree node) _i "Config2<br/>sat: %a<br/>unsat: %a<br/>todo: %a<br/>"
+                  StateSet.print config2.Ata.sat
+                  StateSet.print config2.Ata.unsat
+                  (Ata.TransList.print ~sep:"<br/>") config2.Ata.todo)
         in
-        if states2 != states1 then set cache tree node states2;
+
+        if not (Ata.eq_config config1 config2) then set cache tree node config2;
         let () = loop ns in
-        let _trans3, states3 =
-          Ata.eval_trans auto trans2
-            fcs1 (get cache tree ns) ps states2
+        let config3 =
+          Ata.eval_trans2 auto
+            fcs1 (get cache tree ns) ps config2
             is_left is_right has_left has_right kind
         in
         let () =
-          TRACE(Html.trace (T.preorder tree node) _i "Right BU States: %a<br/>Right BU Trans: %a<br/>" StateSet.print states3 (Ata.TransList.print ~sep:"<br/>") _trans3)
+          TRACE(Html.trace (T.preorder tree node) _i "Config3<br/>sat: %a<br/>unsat: %a<br/>todo: %a<br/>"
+                  StateSet.print config3.Ata.sat
+                  StateSet.print config3.Ata.unsat
+                  (Ata.TransList.print ~sep:"<br/>") config3.Ata.todo)
         in
-        if states3 != states2 then set cache tree node states3;
-        (*if states0 != states3 && (not !redo) then redo := true *)
-        if (not !redo)
-          && not (Ata.TransList.nil == _trans3)
-          && (states1 != states3)
-          && not (StateSet.intersect states3 auto.Ata.selection_states)
+        if not (Ata.eq_config config2 config3) then set cache tree node config3;
+        (* We do set the redo flat if : *)
+        if not (
+          !redo (* already set *)
+          || (Ata.TransList.nil == config3.Ata.todo) (* no more transition to check *)
+          || (Ata.eq_config config0 config3) (* did not gain any new information *)
+        )
         then redo := true
       end
     in
@@ -113,7 +131,7 @@ END
         let acc0 = loop (T.next_sibling tree node) acc in
         let acc1 = loop (T.first_child tree node) acc0 in
 
-        if StateSet.intersect (get cache tree node) auto.Ata.selection_states then
+        if StateSet.intersect (get cache tree node).Ata.sat auto.Ata.selection_states then
           node::acc1
         else
           acc1
@@ -121,7 +139,10 @@ END
     loop node []
 
   let eval auto tree node =
-    let cache = Cache.N1.create StateSet.empty in
+    let cache = Cache.N1.create { Ata.sat = StateSet.empty;
+                                  Ata.unsat = StateSet.empty;
+                                  Ata.todo = Ata.TransList.nil }
+    in
     let redo = ref true in
     let iter = ref 0 in
     Ata.reset auto;