Z3 sources

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

lib/horn_subsume_model_converter.h

@@ -0,0 +1,67 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    horn_subsume_model_converter.h
+
+Abstract:
+
+    Model converter for redundant Horn clauses.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2012-9-16
+
+Revision History:
+
+    
+Notes:
+
+
+Subsumption transformation (remove Horn clause):
+
+    P(x) :- Body(x,y)      Rules
+    ----------------------------
+    Rules
+ 
+    
+    Model converter: 
+
+       P(x) := P(x) or (exists y. Body(x,y))
+
+--*/
+
+#ifndef _HORN_SUBSUME_MODEL_CONVERTER_H_
+#define _HORN_SUBSUME_MODEL_CONVERTER_H_
+
+#include "model_converter.h"
+
+class horn_subsume_model_converter : public model_converter {
+    ast_manager&    m;
+    func_decl_ref_vector m_funcs;
+    expr_ref_vector      m_bodies;
+
+public:
+
+    horn_subsume_model_converter(ast_manager& m): m(m), m_funcs(m), m_bodies(m) {}
+
+    bool mk_horn(expr* clause, func_decl_ref& pred, expr_ref& body) const;
+
+    bool mk_horn(app* head, expr* body, func_decl_ref& pred, expr_ref& body_res) const;
+
+    void insert(app* head, expr* body);
+
+    void insert(app* head, unsigned sz, expr* const* body);
+
+    void insert(func_decl* p, expr* body) { m_funcs.push_back(p); m_bodies.push_back(body); }
+    
+    virtual void operator()(model_ref& m);
+
+    virtual model_converter * translate(ast_translation & translator);
+
+    ast_manager& get_manager() { return m; }
+
+};
+
+#endif