xref: /gem5/src/systemc/ext/dt/bit/sc_bv_base.hh

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 *****************************************************************************/

/*****************************************************************************

  sc_bv_base.h -- Arbitrary size bit vector class.

  Original Author: Gene Bushuyev, Synopsys, Inc.

 *****************************************************************************/

/*****************************************************************************

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:

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// $Log: sc_bv_base.h,v $
// Revision 1.3  2011/08/26 22:32:00  acg
//  Torsten Maehne: added parentheses to make opearator ordering more obvious.
//
// Revision 1.2  2011/08/15 16:43:24  acg
//  Torsten Maehne: changes to remove unused argument warnings.
//
// Revision 1.1.1.1  2006/12/15 20:20:04  acg
// SystemC 2.3
//
// Revision 1.3  2006/01/13 18:53:53  acg
// Andy Goodrich: added $Log command so that CVS comments are reproduced in
// the source.
//

#ifndef __SYSTEMC_EXT_DT_BIT_SC_BV_BASE_HH__
#define __SYSTEMC_EXT_DT_BIT_SC_BV_BASE_HH__

#include "../int/sc_length_param.hh"
#include "sc_bit_proxies.hh"
#include "sc_proxy.hh"

namespace sc_dt
{

// classes defined in this module
class sc_bv_base;


// ----------------------------------------------------------------------------
//  CLASS : sc_bv_base
//
//  Arbitrary size bit vector base class.
// ----------------------------------------------------------------------------

class sc_bv_base : public sc_proxy<sc_bv_base>
{
    friend class sc_lv_base;

    void init(int length_, bool init_value=false);
    void assign_from_string(const std::string &);

  public:
    // typedefs
    typedef sc_proxy<sc_bv_base> base_type;
    typedef base_type::value_type value_type;

    // constructors
    explicit sc_bv_base(int length_=sc_length_param().len()) :
        m_len(0), m_size(0), m_data(0)
    {
        init(length_);
    }

    explicit sc_bv_base(bool a, int length_=sc_length_param().len()) :
        m_len(0), m_size(0), m_data(0)
    {
        init(length_, a);
    }

    sc_bv_base(const char *a);
    sc_bv_base(const char *a, int length_);

    template <class X>
    sc_bv_base(const sc_proxy<X> &a) : m_len(0), m_size(0), m_data(0)
    {
        init(a.back_cast().length());
        base_type::assign_(a);
    }

    sc_bv_base(const sc_bv_base &a);

    // destructor
    virtual ~sc_bv_base() { delete [] m_data; }

    // assignment operators
    template <class X>
    sc_bv_base &
    operator = (const sc_proxy<X> &a)
    {
        assign_p_(*this, a);
        return *this;
    }

    sc_bv_base &
    operator = (const sc_bv_base &a)
    {
        assign_p_(*this, a);
        return *this;
    }

    sc_bv_base &operator = (const char *a);

    sc_bv_base &
    operator = (const bool *a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (const sc_logic *a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (const sc_unsigned &a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (const sc_signed &a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (const sc_uint_base &a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (const sc_int_base &a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (unsigned long a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (long a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (unsigned int a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (int a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (uint64 a)
    {
        base_type::assign_(a);
        return *this;
    }

    sc_bv_base &
    operator = (int64 a)
    {
        base_type::assign_(a);
        return *this;
    }

    // common methods
    int length() const { return m_len; }
    int size() const { return m_size; }

    value_type get_bit(int i) const;
    void set_bit(int i, value_type value);

    sc_digit get_word(int i) const { return m_data[i]; }

    void set_word(int i, sc_digit w) { m_data[i] = w; }

    sc_digit get_cword(int /*i*/) const { return SC_DIGIT_ZERO; }

    void set_cword(int i, sc_digit w);

    void clean_tail();

    // other methods
    bool is_01() const { return true; }

  protected:
    int m_len; // length in bits
    int m_size; // size of data array
    sc_digit *m_data; // data array
};


// IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

// common methods
inline sc_bv_base::value_type
sc_bv_base::get_bit(int i) const
{
    int wi = i / SC_DIGIT_SIZE;
    int bi = i % SC_DIGIT_SIZE;
    return value_type((m_data[wi] >> bi) & SC_DIGIT_ONE);
}

inline void
sc_bv_base::set_bit(int i, value_type value)
{
    int wi = i / SC_DIGIT_SIZE;
    int bi = i % SC_DIGIT_SIZE;
    sc_digit mask = SC_DIGIT_ONE << bi;
    m_data[wi] |= mask; // set bit to 1
    m_data[wi] &= value << bi | ~mask;
}

inline void
sc_bv_base::set_cword(int /*i*/, sc_digit w)
{
    if (w) {
        SC_REPORT_WARNING("sc_bv cannot contain values X and Z", 0);
    }
}

inline void
sc_bv_base::clean_tail()
{
    int wi = m_size - 1;
    int bi = m_len % SC_DIGIT_SIZE;
    if (bi != 0)
        m_data[wi] &= ~SC_DIGIT_ZERO >> (SC_DIGIT_SIZE - bi);
}

} // namespace sc_dt

#endif // __SYSTEMC_EXT_DT_BIT_SC_BV_BASE_HH__