Z3 sources

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

lib/spc_asserted_literals.h

@@ -0,0 +1,69 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    spc_asserted_literals.h
+
+Abstract:
+
+    <abstract>
+
+Author:
+
+    Leonardo de Moura (leonardo) 2008-02-14.
+
+Revision History:
+
+--*/
+#ifndef _SPC_ASSERTED_LITERALS_H_
+#define _SPC_ASSERTED_LITERALS_H_
+
+#include"spc_clause.h"
+#include"substitution_tree.h"
+#include"obj_hashtable.h"
+
+namespace spc {
+    
+    /**
+       \brief Index for the asserted literals in the logical context.
+       
+       This index is used to implement forward unit subsumption, 
+       equality subsumption, positive simplify-reflect, and
+       negative simplify-reflect.
+    */
+    class asserted_literals {
+    protected:
+        typedef obj_map<expr, clause*> expr2clause;
+        ast_manager &       m_manager;
+        substitution_tree * m_st[2];
+        expr2clause *       m_expr2clause[2];
+        substitution        m_subst;
+        tmp_app             m_tmp_eq1;
+        tmp_app             m_tmp_eq2;
+    public:
+        asserted_literals(ast_manager & m);
+        ~asserted_literals();
+
+        void insert(clause * cls);
+        void erase(clause * cls);
+        void reset();
+        void reserve_vars(unsigned num_vars) { m_subst.reserve_vars(num_vars); }
+
+        clause * gen(literal const & l) {
+            return gen(l.atom(), l.sign());
+        }
+
+        clause * gen(expr * atom, bool neg);
+        clause * gen_eq(expr * lhs, expr * rhs);
+        clause * subsumes(expr * lhs, expr * rhs);
+
+        bool has_pos_literals() const { return !m_st[0]->empty(); }
+        bool has_neg_literals() const { return !m_st[1]->empty(); }
+        bool has_literals() const { return has_pos_literals() || has_neg_literals(); }
+    };
+    
+};
+
+#endif /* _SPC_ASSERTED_LITERALS_H_ */
+