Z3 sources

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

lib/quant_hoist.h

@@ -0,0 +1,64 @@
+/*++
+Copyright (c) 2010 Microsoft Corporation
+
+Module Name:
+
+    quant_hoist.h
+
+Abstract:
+
+    Quantifier hoisting utility.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2010-02-19
+
+Revision History:
+
+    Hoisted from quant_elim.
+
+--*/
+
+#ifndef __QUANTIFIER_HOISTER_H_
+#define __QUANTIFIER_HOISTER_H_
+
+#include "ast.h"
+
+class quantifier_hoister {
+    class impl;
+    impl* m_impl;
+public:
+    quantifier_hoister(ast_manager& m);
+    
+    ~quantifier_hoister(); 
+
+    /**
+       \brief Pull top-most quantifier up.
+       Create fresh constants for the bound variables.
+       Return the constants, the quantifier type (forall or exists), and
+       the sub-formula under the quantifier.
+
+       The list of variables is empty if the formula is quantifier free or
+       if the existing quantifiers occur under a connective other than
+       or, and, implies, ite (then and else branch only).
+    */
+
+    void operator()(expr* fml, app_ref_vector& vars, bool& is_fa, expr_ref& result);
+
+    /**
+       \brief Pull top-most existential quantifier up.
+
+       The list of variables is empty if there are no top-level existential quantifier.
+    */
+    void pull_exists(expr* fml, app_ref_vector& vars, expr_ref& result);
+
+
+    /**
+       \brief Pull top-most universal (is_forall=true) or existential (is_forall=false) quantifier up.
+
+       The list of variables is empty if there are no top-level universal/existential quantifier.
+    */
+    void pull_quantifier(bool is_forall, expr_ref& fml, app_ref_vector& vars);
+};
+
+#endif