Z3 sources

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

lib/goal2sat.h

@@ -0,0 +1,86 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    goal2sat.h
+
+Abstract:
+
+    "Compile" a goal into the SAT engine.
+    Atoms are "abstracted" into boolean variables.
+    The mapping between boolean variables and atoms
+    can be used to convert back the state of the 
+    SAT engine into a goal.
+
+    The idea is to support scenarios such as:
+    1) simplify, blast, convert into SAT, and solve
+    2) convert into SAT, apply SAT for a while, learn new units, and translate back into a goal.
+    3) convert into SAT, apply SAT preprocessor (failed literal propagation, resolution, etc) and translate back into a goal.
+    4) Convert boolean structure into SAT, convert atoms into another engine, combine engines using lazy combination, solve.
+
+Author:
+
+    Leonardo (leonardo) 2011-10-26
+
+Notes:
+
+--*/
+#ifndef _GOAL2SAT_H_
+#define _GOAL2SAT_H_
+
+#include"goal.h"
+#include"sat_solver.h"
+#include"model_converter.h"
+#include"atom2bool_var.h"
+
+class goal2sat {
+    struct imp;
+    imp *  m_imp;
+    struct scoped_set_imp;
+public:
+    goal2sat();
+
+    static void collect_param_descrs(param_descrs & r);
+
+    static bool has_unsupported_bool(goal const & s);
+
+    /**
+       \brief "Compile" the goal into the given sat solver.
+       Store a mapping from atoms to boolean variables into m.
+       
+       \remark m doesn't need to be empty. the definitions there are 
+       reused.
+    
+       \warning conversion throws a tactic_exception, if it is interrupted (by set_cancel),
+       an unsupported operator is found, or memory consumption limit is reached (set with param :max-memory).
+    */
+    void operator()(goal const & g, params_ref const & p, sat::solver & t, atom2bool_var & m);
+
+    void set_cancel(bool f);
+};
+
+
+class sat2goal {
+    struct imp;
+    imp *  m_imp;
+    struct scoped_set_imp;
+public:
+    sat2goal();
+
+    static void collect_param_descrs(param_descrs & r);
+
+    /**
+       \brief Translate the state of the SAT engine back into a goal.
+       The SAT solver may use variables that are not in \c m. The translator
+       creates fresh boolean AST variables for them. They are stored in fvars.
+       
+       \warning conversion throws a tactic_exception, if it is interrupted (by set_cancel),
+       or memory consumption limit is reached (set with param :max-memory).
+    */
+    void operator()(sat::solver const & t, atom2bool_var const & m, params_ref const & p, goal & s, model_converter_ref & mc);
+    
+    void set_cancel(bool f);
+};
+
+#endif