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/*****************************************************************************
sc_bv_base.cpp -- 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.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 1.4 2006/04/11 23:12:26 acg
// Andy Goodrich: Fixed bug in parsing of extended string constants like
// 0bus1110011.
//
// 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 <cstring>
#include <sstream>
#include "systemc/ext/dt/bit/messages.hh"
#include "systemc/ext/dt/bit/sc_bv_base.hh"
#include "systemc/ext/dt/fx/sc_fix.hh"
#include "systemc/ext/dt/fx/sc_ufix.hh"
#include "systemc/ext/utils/sc_report.hh"
namespace sc_dt
{
// ----------------------------------------------------------------------------
// CLASS : sc_bv_base
//
// Arbitrary size bit vector base class.
// ----------------------------------------------------------------------------
void
sc_bv_base::init(int length_, bool 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];
// initialize the bits to 'init_value'
sc_digit dw = init_value ? ~SC_DIGIT_ZERO : SC_DIGIT_ZERO;
int sz = m_size;
for (int i = 0; i < sz; ++i) {
m_data[i] = dw;
}
clean_tail();
}
void
sc_bv_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];
if (c != '0' && c != '1') {
SC_REPORT_ERROR(sc_core::SC_ID_CANNOT_CONVERT_,
"string can contain only '0' and '1' characters");
// may continue, if suppressed
c = '0';
}
set_bit(i, sc_logic_value_t(c - '0'));
}
// 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_bv_base::sc_bv_base(const char *a) : m_len(0), m_size(0), m_data(0)
{
std::string s = convert_to_bin(a);
init(s.length() - 1);
assign_from_string(s);
}
sc_bv_base::sc_bv_base(const char *a, int length_) :
m_len(0), m_size(0), m_data(0)
{
init(length_);
assign_from_string(convert_to_bin(a));
}
sc_bv_base::sc_bv_base(const sc_bv_base &a) :
sc_proxy<sc_bv_base>(), m_len(a.m_len), m_size(a.m_size),
m_data(new sc_digit[m_size])
{
// copy the bits
int sz = m_size;
for (int i = 0; i < sz; ++i) {
m_data[i] = a.m_data[i];
}
}
// assignment operators
sc_bv_base &
sc_bv_base::operator = (const char *a)
{
assign_from_string(convert_to_bin(a));
return *this;
}
// ----------------------------------------------------------------------------
// convert formatted string to binary string
const std::string
convert_to_bin(const char *s)
{
// Beware: logic character strings cannot start with '0x' or '0X',
// because this is seen as a hexadecimal encoding prefix!
if (s == 0) {
SC_REPORT_ERROR(sc_core::SC_ID_CANNOT_CONVERT_,
"character string is zero");
return std::string();
}
if (*s == 0) {
SC_REPORT_ERROR(sc_core::SC_ID_CANNOT_CONVERT_,
"character string is empty");
return std::string();
}
int n = strlen(s);
int i = 0;
if (s[0] == '-' || s[0] == '+') {
++i;
}
if (n > (i + 2) && s[i] == '0') {
if (s[i + 1] == 'b' || s[i + 1] == 'B') {
if (s[i + 2] == '0' || s[i + 2] == '1') {
std::string str(&s[2]);
str += "F";
return str;
}
}
if (s[i + 1] == 'b' || s[i + 1] == 'B' ||
s[i + 1] == 'c' || s[i + 1] == 'C' ||
s[i + 1] == 'd' || s[i + 1] == 'D' ||
s[i + 1] == 'o' || s[i + 1] == 'O' ||
s[i + 1] == 'x' || s[i + 1] == 'X') {
try {
// worst case length = n * 4
sc_fix a(s, n * 4, n * 4, SC_TRN, SC_WRAP, 0, SC_ON);
std::string str = a.to_bin();
str += "F"; // mark the string as formatted
// get rid of prefix (0b) and redundant leading bits
const char *p = str.c_str() + 2;
while (p[1] && p[0] == p[1]) {
++p;
}
return std::string(p);
} catch (const sc_core::sc_report &) {
std::stringstream msg;
msg << "character string '" << s << "' is not valid";
SC_REPORT_ERROR(sc_core::SC_ID_CANNOT_CONVERT_,
msg.str().c_str());
return std::string();
}
}
}
// bin by default
std::string str(s);
str += "U"; // mark the string as unformatted
return str;
}
// convert binary string to formatted string
const std::string
convert_to_fmt(const std::string &s, sc_numrep numrep, bool w_prefix)
{
int n = s.length();
std::string str("0bus");
// str += "0bus";
str += s;
sc_ufix a(str.c_str(), n, n, SC_TRN, SC_WRAP, 0, SC_ON);
return a.to_string(numrep, w_prefix);
}
} // namespace sc_dt