sc_lv_base.cc

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

  sc_lv_base.cpp -- Arbitrary size logic vector class.

  Original Author: Gene Bushuyev, Synopsys, Inc.

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

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  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
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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 <sstream>

#include "systemc/ext/dt/bit/messages.hh"
#include "systemc/ext/dt/bit/sc_lv_base.hh"
#include "systemc/ext/utils/messages.hh"

namespace sc_dt
{

// explicit template instantiations
template class sc_proxy<sc_lv_base>;
template class sc_proxy<sc_bv_base>;

void
sc_proxy_out_of_bounds(const char *msg, int64 val)
{
    std::stringstream ss;
    if (msg != NULL)
        ss << msg;
    if (val != 0)
        ss << val;
    SC_REPORT_ERROR(sc_core::SC_ID_OUT_OF_BOUNDS_, ss.str().c_str());
}

// ----------------------------------------------------------------------------
//  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);
        sc_core::sc_abort(); // can't recover from here
    }
    // 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