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//
// UCSD p-System cross compiler
// Copyright (C) 2006 Peter Miller
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or (at
// you option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307,
// USA
//

#ifndef LIB_STATEMENT_H
#define LIB_STATEMENT_H

#include <lib/location.h>
#include <lib/statement/smart_pointer.h>

class statement
{
public:
    typedef statement_smart_pointer pointer;

protected:
    virtual ~statement();

public:
    virtual void traversal() = 0;

    virtual bool empty() const;

    const location &get_location() const { return locn; }

    virtual bool execution_flows_out() const = 0;

    void reference_count_up();

    void reference_count_down();

protected:
    statement();

    statement(const statement &);

    statement &operator=(const statement &);

    void set_location(const location &arg);

private:
    long reference_count;

    bool reference_count_valid() const { return (reference_count >= 1); }

    location locn;
};

#endif // LIB_STATEMENT_H

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