sc_bv_base.h

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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.
 
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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 SC_BV_BASE_H
#define SC_BV_BASE_H
 
 
#include "sysc/datatypes/bit/sc_bit_ids.h"
#include "sysc/datatypes/bit/sc_bit_proxies.h"
#include "sysc/datatypes/bit/sc_proxy.h"
#include "sysc/datatypes/int/sc_length_param.h"
#include "sysc/datatypes/int/sc_nbdefs.h"
 
 
namespace sc_dt
{
 
// classes defined in this module
class sc_bv_base;
 
 
// ----------------------------------------------------------------------------
//  CLASS : sc_bv_base
//
//  Arbitrary size bit vector base class.
// ----------------------------------------------------------------------------
 
class SC_API 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 );
 
#ifdef SC_DT_DEPRECATED
 
    explicit sc_bv_base( const sc_unsigned& a )
        : m_len( 0 ), m_size( 0 ), m_data( 0 )
        { init( a.length() ); base_type::assign_( a ); }
 
    explicit sc_bv_base( const sc_signed& a )
        : m_len( 0 ), m_size( 0 ), m_data( 0 )
        { init( a.length() ); base_type::assign_( a ); }
 
    explicit sc_bv_base( const sc_uint_base& a)
        : m_len( 0 ), m_size( 0 ), m_data( 0 )
        { init( a.length() ); base_type::assign_( a ); }
 
    explicit sc_bv_base( const sc_int_base& a)
        : m_len( 0 ), m_size( 0 ), m_data( 0 )
        { init( a.length() ); base_type::assign_( a ); }
 
#endif
 
 
    // destructor
 
    virtual ~sc_bv_base()
        { if ( m_data != m_base_vec ) 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
    sc_digit  m_base_vec[SC_BASE_VEC_DIGITS > 0 ? SC_BASE_VEC_DIGITS : 1];
};
 
 
// 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_core::SC_ID_SC_BV_CANNOT_CONTAIN_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