Z3 sources

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

lib/dl_rule_subsumption_index.h

@@ -0,0 +1,65 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    dl_rule_subsumption_index.h
+
+Abstract:
+
+    Subsumption index for rules.
+    Currently an underapproximation (fails to identify some subsumptions).
+
+Author:
+
+    Krystof Hoder (t-khoder) 2011-10-10.
+
+Revision History:
+
+--*/
+
+#ifndef _DL_RULE_SUBSUMPTION_INDEX_H_
+#define _DL_RULE_SUBSUMPTION_INDEX_H_
+
+#include "dl_context.h"
+
+namespace datalog {
+
+    class rule_subsumption_index {
+        //private and undefined copy constroctor
+        rule_subsumption_index(rule_subsumption_index const&);
+        //private and undefined operator=
+        rule_subsumption_index& operator=(rule_subsumption_index const&);
+
+        typedef obj_hashtable<app> app_set;
+
+        ast_manager & m;
+        context & m_context;
+
+        rule_ref_vector m_ref_holder;
+
+        obj_map<func_decl, app_set *> m_unconditioned_heads;
+
+        hashtable<rule *, rule_hash_proc, rule_eq_proc> m_rule_set;
+
+        void handle_unconditioned_rule(rule * r);
+
+    public:
+        rule_subsumption_index(context & ctx) :
+            m(ctx.get_manager()),
+            m_context(ctx),
+            m_ref_holder(ctx.get_rule_manager()) {}
+
+        ~rule_subsumption_index() {
+            reset_dealloc_values(m_unconditioned_heads);
+        }
+
+        void add(rule * r);
+        bool is_subsumed(rule * r);
+        bool is_subsumed(app * query);
+    };
+
+};
+
+#endif /* _DL_RULE_SUBSUMPTION_INDEX_H_ */
+