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