Z3 sources

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

lib/pdr_reachable_cache.h

@@ -0,0 +1,59 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    reachable_cache.h
+
+Abstract:
+
+    Object for caching of reachable states.
+
+Author:
+
+    Krystof Hoder (t-khoder) 2011-9-14.
+
+Revision History:
+
+--*/
+
+#include "ast.h"
+#include "params.h"
+#include "ref_vector.h"
+#include "pdr_manager.h"
+#include "pdr_smt_context_manager.h"
+
+#ifndef _REACHABLE_CACHE_H_
+#define _REACHABLE_CACHE_H_
+
+namespace pdr {
+    class reachable_cache {
+        ast_manager &        m;
+        manager &            m_pm;
+        scoped_ptr<smt_context>    m_ctx;
+        ast_ref_vector       m_ref_holder;
+        app_ref              m_disj_connector;
+        obj_hashtable<expr>  m_cache;
+        unsigned             m_cache_hits;
+        unsigned             m_cache_miss;
+        unsigned             m_cache_inserts;
+        datalog::PDR_CACHE_MODE m_cache_mode;
+        
+        void add_disjuncted_formula(expr * f);
+        
+    public:
+        reachable_cache(pdr::manager & pm, params_ref const& params);
+        
+        void add_init(app * f)   { add_disjuncted_formula(f); }
+        
+        /** add cube whose all models are reachable */
+        void add_reachable(expr * cube);
+        
+        /** return true if there is a model of cube which is reachable */
+        bool is_reachable(expr * cube);
+        
+        void collect_statistics(statistics& st) const;
+    };
+}
+
+#endif