xref: /gem5/ext/systemc/src/sysc/datatypes/bit/sc_bv_base.h

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  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
  more contributor license agreements.  See the NOTICE file distributed
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  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
  implied.  See the License for the specific language governing
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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:

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

// $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"


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;


    // 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()
	{ 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; }


#if 0

    // bitwise complement

    sc_bv_base& b_not();

    const sc_bv_base operator ~ () const
	{ sc_bv_base a( *this ); return a.b_not(); }


    // bitwise left shift

    sc_bv_base& operator <<= ( int n );

    const sc_bv_base operator << ( int n ) const
	{ sc_bv_base a( *this ); return ( a <<= n ); }


    // bitwise right shift

    sc_bv_base& operator >>= ( int n );

    const sc_bv_base operator >> ( int n ) const
	{ sc_bv_base a( *this ); return ( a >>= n ); }


    // bitwise left rotate

    sc_bv_base& lrotate( int n );


    // bitwise right rotate

    sc_bv_base& rrotate( int n );

#endif


    // common methods

    int length() const
	{ return m_len; }

    int size() const
	{ return m_size; }

    sc_logic_value_t get_bit( int i ) const;
    void set_bit( int i, sc_logic_value_t 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

#if 0

// bitwise left rotate

inline
const sc_bv_base
lrotate( const sc_bv_base& x, int n )
{
    sc_bv_base a( x );
    return a.lrotate( n );
}


// bitwise right rotate

inline
const sc_bv_base
rrotate( const sc_bv_base& x, int n )
{
    sc_bv_base a( x );
    return a.rrotate( n );
}

#endif


// common methods

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

inline
void
sc_bv_base::set_bit( int i, sc_logic_value_t 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