/*++
Copyright (c) 2006 Microsoft Corporation

Module Name:

    smt_checker.h

Abstract:

    <abstract>

Author:

    Leonardo de Moura (leonardo) 2008-06-20.

Revision History:

--*/
#ifndef _SMT_CHECKER_H_
#define _SMT_CHECKER_H_

#include"ast.h"
#include"obj_hashtable.h"

namespace smt {

    class context;

    class checker {

        typedef obj_map<expr, bool>    expr2bool;
        typedef obj_map<expr, enode *> expr2enode;

        context &              m_context;
        ast_manager &          m_manager;
        expr2bool              m_is_true_cache[2];
        expr2enode             m_to_enode_cache;
        unsigned               m_num_bindings;
        enode * const *        m_bindings;

        bool all_args(app * a, bool is_true);
        bool any_arg(app * a, bool is_true);
        bool check_core(expr * n, bool is_true);
        bool check(expr * n, bool is_true);
        enode * get_enode_eq_to_core(app * n);
        enode * get_enode_eq_to(expr * n);

    public:
        checker(context & c);
        bool is_sat(expr * n, unsigned num_bindings = 0, enode * const * bindings = 0);
        bool is_unsat(expr * n, unsigned num_bindings = 0, enode * const * bindings = 0);
    };

};

#endif /* _SMT_CHECKER_H_ */