xref: /gem5/ext/systemc/src/sysc/datatypes/bit/sc_lv_base.cpp

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

  sc_lv_base.cpp -- Arbitrary size logic 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_lv_base.cpp,v $
// Revision 1.2  2011/08/24 22:05:40  acg
//  Torsten Maehne: initialization changes to remove 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.
//

#include "sysc/datatypes/bit/sc_bit_ids.h"
#include "sysc/datatypes/bit/sc_lv_base.h"


namespace sc_dt
{

// ----------------------------------------------------------------------------
//  CLASS : sc_lv_base
//
//  Arbitrary size logic vector base class.
// ----------------------------------------------------------------------------

static const sc_digit data_array[] =
    { SC_DIGIT_ZERO, ~SC_DIGIT_ZERO, SC_DIGIT_ZERO, ~SC_DIGIT_ZERO };

static const sc_digit ctrl_array[] =
    { SC_DIGIT_ZERO, SC_DIGIT_ZERO, ~SC_DIGIT_ZERO, ~SC_DIGIT_ZERO };


void
sc_lv_base::init( int length_, const sc_logic& init_value )
{
    // check the length
    if( length_ <= 0 ) {
	SC_REPORT_ERROR( sc_core::SC_ID_ZERO_LENGTH_, 0 );
    }
    // allocate memory for the data and control words
    m_len = length_;
    m_size = (m_len - 1) / SC_DIGIT_SIZE + 1;
    m_data = new sc_digit[m_size * 2];
    m_ctrl = m_data + m_size;
    // initialize the bits to 'init_value'
    sc_digit dw = data_array[init_value.value()];
    sc_digit cw = ctrl_array[init_value.value()];
    int sz = m_size;
    for( int i = 0; i < sz; ++ i ) {
	m_data[i] = dw;
	m_ctrl[i] = cw;
    }
    clean_tail();
}


void
sc_lv_base::assign_from_string( const std::string& s )
{
    // s must have been converted to bin
    int len = m_len;
    int s_len = s.length() - 1;
    int min_len = sc_min( len, s_len );
    int i = 0;
    for( ; i < min_len; ++ i ) {
	char c = s[s_len - i - 1];
	set_bit( i, sc_logic::char_to_logic[(int)c] );
    }
    // if formatted, fill the rest with sign(s), otherwise fill with zeros
    sc_logic_value_t fill = (s[s_len] == 'F' ? sc_logic_value_t( s[0] - '0' )
		                             : sc_logic_value_t( 0 ));
    for( ; i < len; ++ i ) {
	set_bit( i, fill );
    }
}


// constructors

sc_lv_base::sc_lv_base( const char* a )
    : m_len( 0 ), m_size( 0 ), m_data( 0 ), m_ctrl( 0 )
{
    std::string s = convert_to_bin( a );
    init( s.length() - 1 );
    assign_from_string( s );
}

sc_lv_base::sc_lv_base( const char* a, int length_ )
    : m_len( 0 ), m_size( 0 ), m_data( 0 ), m_ctrl( 0 )
{
    init( length_ );
    assign_from_string( convert_to_bin( a ) );
}

sc_lv_base::sc_lv_base( const sc_lv_base& a )
    : sc_proxy<sc_lv_base>(),
      m_len( a.m_len ),
      m_size( a.m_size ),
      m_data( new sc_digit[m_size * 2] ),
      m_ctrl( m_data + m_size )
{
    // copy the bits
    int sz = m_size;
    for( int i = 0; i < sz; ++ i ) {
	m_data[i] = a.m_data[i];
	m_ctrl[i] = a.m_ctrl[i];
    }
}


// assignment operators

sc_lv_base&
sc_lv_base::operator = ( const char* a )
{
    assign_from_string( convert_to_bin( a ) );
    return *this;
}


// returns true if logic vector contains only 0's and 1's

bool
sc_lv_base::is_01() const
{
    int sz = m_size;
    for( int i = 0; i < sz; ++ i ) {
	if( m_ctrl[i] != 0 ) {
	    return false;
	}
    }
    return true;
}

} // namespace sc_dt