src/systemc/dt/int/sc_int_base.cc

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

  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
  more contributor license agreements.  See the NOTICE file distributed
  with this work for additional information regarding copyright ownership.
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/*****************************************************************************

  sc_int_base.cpp -- contains interface definitions between sc_int and
                sc_signed, sc_unsigned, and definitions for sc_int_subref.

  Original Author: Ali Dasdan, Synopsys, Inc.

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

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

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:

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


// $Log: sc_int_base.cpp,v $
// Revision 1.5  2011/02/18 20:19:14  acg
//  Andy Goodrich: updating Copyright notice.
//
// Revision 1.4  2010/02/04 22:23:29  acg
//  Andy Goodrich: fixed bug in concatenation reads for part selections,
//  the mask being used was 32 bits and should have been 64 bits.
//
// Revision 1.3  2008/06/19 17:47:56  acg
//  Andy Goodrich: fixes for bugs. See 2.2.1 RELEASENOTES.
//
// Revision 1.2  2007/11/04 21:27:00  acg
//  Andy Goodrich: changes to make sure the proper value is returned from
//  concat_get_data().
//
// Revision 1.1.1.1  2006/12/15 20:20:05  acg
// SystemC 2.3
//
// Revision 1.3  2006/01/13 18:49:31  acg
// Added $Log command so that CVS check in comments are reproduced in the
// source.
//

#include <sstream>

#include "systemc/ext/dt/bit/sc_bv_base.hh"
#include "systemc/ext/dt/bit/sc_lv_base.hh"
#include "systemc/ext/dt/fx/sc_fix.hh"
#include "systemc/ext/dt/fx/scfx_other_defs.hh"
#include "systemc/ext/dt/int/sc_int_base.hh"
#include "systemc/ext/dt/int/sc_signed.hh"
#include "systemc/ext/dt/int/sc_uint_base.hh"
#include "systemc/ext/dt/int/sc_unsigned.hh"
#include "systemc/ext/dt/misc/sc_concatref.hh"
#include "systemc/ext/utils/messages.hh"

// explicit template instantiations
namespace sc_core
{

template class sc_vpool<sc_dt::sc_int_bitref>;
template class sc_vpool<sc_dt::sc_int_subref>;

} // namespace sc_core

namespace sc_dt
{

// to avoid code bloat in sc_int_concref<T1,T2>

void
sc_int_concref_invalid_length(int length)
{
    std::stringstream msg;
    msg << "sc_int_concref<T1,T2> initialization: length = " << length <<
           "violates 1 <= length <= " << SC_INTWIDTH;
    SC_REPORT_ERROR(sc_core::SC_ID_OUT_OF_BOUNDS_, msg.str().c_str());
    sc_core::sc_abort(); // can't recover from here
}


// ----------------------------------------------------------------------------
//  CLASS : sc_int_bitref
//
//  Proxy class for sc_int bit selection (r-value and l-value).
// ----------------------------------------------------------------------------

sc_core::sc_vpool<sc_int_bitref> sc_int_bitref::m_pool(9);

// concatenation methods:

// #### OPTIMIZE
void sc_int_bitref::concat_set(int64 src, int low_i)
{
    sc_int_base aa(1);
    *this = aa = (low_i < 64) ? src >> low_i : src >> 63;
}

void sc_int_bitref::concat_set(const sc_signed &src, int low_i)
{
    sc_int_base aa(1);
    if (low_i < src.length())
        *this = aa = 1 & (src >> low_i);
    else
        *this = aa = (src < 0) ? (int_type)-1 : 0;
}

void sc_int_bitref::concat_set(const sc_unsigned &src, int low_i)
{
    sc_int_base aa(1);
    if (low_i < src.length())
        *this = aa = 1 & (src >> low_i);
    else
        *this = aa = 0;
}

void sc_int_bitref::concat_set(uint64 src, int low_i)
{
    sc_int_base aa(1);
    *this = aa = (low_i < 64) ? src >> low_i : 0;
}


// other methods
void
sc_int_bitref::scan(::std::istream &is)
{
    bool b;
    is >> b;
    *this = b;
}


// ----------------------------------------------------------------------------
//  CLASS : sc_int_subref_r
//
//  Proxy class for sc_int part selection (l-value).
// ----------------------------------------------------------------------------

bool
sc_int_subref_r::concat_get_ctrl(sc_digit *dst_p, int low_i) const
{
    int dst_i; // Word in dst_p now processing.
    int end_i; // Highest order word in dst_p to process.
    int high_i; // Index of high order bit in dst_p to set.
    uint_type mask; // Mask for bits to extract or keep.

    dst_i = low_i / BITS_PER_DIGIT;
    high_i = low_i + (m_left - m_right);
    end_i = high_i / BITS_PER_DIGIT;
    mask = ~mask_int[m_left][m_right];

    // PROCESS THE FIRST WORD:
    dst_p[dst_i] = (sc_digit)(dst_p[dst_i] & mask);
    switch (end_i - dst_i) {
      // BITS ARE ACROSS TWO WORDS:
      case 1:
        dst_i++;
        dst_p[dst_i] = 0;
        break;

      // BITS ARE ACROSS THREE WORDS:
      case 2:
        dst_i++;
        dst_p[dst_i++] = 0;
        dst_p[dst_i] = 0;
        break;

      // BITS ARE ACROSS FOUR WORDS:
      case 3:
        dst_i++;
        dst_p[dst_i++] = 0;
        dst_p[dst_i++] = 0;
        dst_p[dst_i] = 0;
        break;
    }
    return false;
}

bool
sc_int_subref_r::concat_get_data(sc_digit *dst_p, int low_i) const
{
    int dst_i; // Word in dst_p now processing.
    int end_i; // Highest order word in dst_p to process.
    int high_i; // Index of high order bit in dst_p to set.
    int left_shift; // Left shift for val.
    uint_type mask; // Mask for bits to extract or keep.
    bool non_zero; // True if value inserted is non-zero.
    uint_type val; // Selection value extracted from m_obj_p.

    dst_i = low_i / BITS_PER_DIGIT;
    left_shift = low_i % BITS_PER_DIGIT;
    high_i = low_i + (m_left-m_right);
    end_i = high_i / BITS_PER_DIGIT;
    mask = ~mask_int[m_left][m_right];
    val = (m_obj_p->m_val & mask) >> m_right;
    non_zero = val != 0;

    // PROCESS THE FIRST WORD:
    mask = ~(~UINT_ZERO << left_shift);
    dst_p[dst_i] = (sc_digit)((dst_p[dst_i] & mask) |
                ((val << left_shift) & DIGIT_MASK));

    switch (end_i - dst_i) {
      // BITS ARE ACROSS TWO WORDS:
      case 1:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i] = (sc_digit)(val & DIGIT_MASK);
        break;

      // BITS ARE ACROSS THREE WORDS:
      case 2:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (sc_digit)val;
        break;

      // BITS ARE ACROSS FOUR WORDS:
      case 3:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (sc_digit)val;
        break;
    }
    return non_zero;
}

// ----------------------------------------------------------------------------
//  CLASS : sc_int_subref
//
//  Proxy class for sc_int part selection (r-value and l-value).
// ----------------------------------------------------------------------------

sc_core::sc_vpool<sc_int_subref> sc_int_subref::m_pool(9);

// assignment operators

sc_int_subref &
sc_int_subref::operator = (int_type v)
{
    int_type val = m_obj_p->m_val;
    uint_type mask = mask_int[m_left][m_right];
    val &= mask;
    val |= (v << m_right) & ~mask;
    m_obj_p->m_val = val;
    m_obj_p->extend_sign();
    return *this;
}

sc_int_subref &
sc_int_subref::operator = (const sc_signed &a)
{
    sc_int_base aa(length());
    return (*this = aa = a);
}

sc_int_subref &
sc_int_subref::operator = (const sc_unsigned &a)
{
    sc_int_base aa(length());
    return (*this = aa = a);
}

sc_int_subref &
sc_int_subref::operator = (const sc_bv_base &a)
{
    sc_int_base aa(length());
    return (*this = aa = a);
}

sc_int_subref &
sc_int_subref::operator = (const sc_lv_base &a)
{
    sc_int_base aa(length());
    return (*this = aa = a);
}


// concatenation methods:
// #### OPTIMIZE
void
sc_int_subref::concat_set(int64 src, int low_i)
{
    sc_int_base aa(length());
    *this = aa = (low_i < 64) ? src >> low_i : src >> 63;
}

void
sc_int_subref::concat_set(const sc_signed &src, int low_i)
{
    sc_int_base aa(length());
    if (low_i < src.length())
        *this = aa = src >> low_i;
    else
        *this = (src < 0) ? (int_type)-1 : 0;
}

void
sc_int_subref::concat_set(const sc_unsigned &src, int low_i)
{
    sc_int_base aa(length());
    if (low_i < src.length())
        *this = aa = src >> low_i;
    else
        *this = 0;
}

void
sc_int_subref::concat_set(uint64 src, int low_i)
{
    sc_int_base aa (length());
    *this = aa = (low_i < 64) ? src >> low_i : 0;
}


// other methods
void
sc_int_subref::scan(::std::istream &is)
{
    std::string s;
    is >> s;
    *this = s.c_str();
}


// ----------------------------------------------------------------------------
//  CLASS : sc_int_base
//
//  Base class for sc_int.
// ----------------------------------------------------------------------------

// support methods
void
sc_int_base::invalid_length() const
{
    std::stringstream msg;
    msg << "sc_int[_base] initialization: length = " << m_len <<
           " violates 1 <= length <= " << SC_INTWIDTH;
    SC_REPORT_ERROR(sc_core::SC_ID_OUT_OF_BOUNDS_, msg.str().c_str());
    sc_core::sc_abort(); // can't recover from here
}

void
sc_int_base::invalid_index(int i) const
{
    std::stringstream msg;
    msg << "sc_int[_base] bit selection: index = " << i <<
           " violates 0 <= index <= " << (m_len - 1);
    SC_REPORT_ERROR(sc_core::SC_ID_OUT_OF_BOUNDS_, msg.str().c_str());
    sc_core::sc_abort(); // can't recover from here
}

void
sc_int_base::invalid_range(int l, int r) const
{
    std::stringstream msg;
    msg << "sc_int[_base] part selection: " <<
           "left = " << l << ", right = " << r << " violates " <<
           (m_len-1) << " >= left >= right >= 0";
    SC_REPORT_ERROR(sc_core::SC_ID_OUT_OF_BOUNDS_, msg.str().c_str());
    sc_core::sc_abort(); // can't recover from here
}

void
sc_int_base::check_value() const
{
    int_type limit = (int_type)1 << (m_len - 1);
    if (m_val < -limit || m_val >= limit) {
        std::stringstream msg;
        msg << "sc_int[_base]: value does not fit into a length of " << m_len;
        SC_REPORT_WARNING(sc_core::SC_ID_OUT_OF_BOUNDS_, msg.str().c_str());
    }
}


// constructors
sc_int_base::sc_int_base(const sc_bv_base &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v;
}
sc_int_base::sc_int_base(const sc_lv_base &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v;
}
sc_int_base::sc_int_base(const sc_uint_subref_r &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v.to_uint64();
}
sc_int_base::sc_int_base(const sc_signed_subref_r &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v.to_uint64();
}
sc_int_base::sc_int_base(const sc_unsigned_subref_r &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v.to_uint64();
}

sc_int_base::sc_int_base(const sc_signed &a) :
    m_val(0), m_len(a.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = a.to_int64();
}

sc_int_base::sc_int_base(const sc_unsigned &a) :
    m_val(0), m_len(a.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = a.to_int64();
}


// assignment operators
sc_int_base &
sc_int_base::operator = (const sc_signed &a)
{
    int minlen = sc_min(m_len, a.length());
    int i = 0;
    for (; i < minlen; ++i) {
        set(i, a.test(i));
    }
    bool sgn = a.sign();
    for (; i < m_len; ++i) {
        // sign extension
        set(i, sgn);
    }
    extend_sign();
    return *this;
}

sc_int_base &
sc_int_base::operator = (const sc_unsigned &a)
{
    int minlen = sc_min(m_len, a.length());
    int i = 0;
    for (; i < minlen; ++i) {
        set(i, a.test(i));
    }
    for (; i < m_len; ++i) {
        // zero extension
        set(i, 0);
    }
    extend_sign();
    return *this;
}


sc_int_base &
sc_int_base::operator = (const sc_bv_base &a)
{
    int minlen = sc_min(m_len, a.length());
    int i = 0;
    for (; i < minlen; ++i) {
        set(i, a.get_bit(i));
    }
    for (; i < m_len; ++i) {
        // zero extension
        set(i, 0);
    }
    extend_sign();
    return *this;
}

sc_int_base &
sc_int_base::operator = (const sc_lv_base &a)
{
    int minlen = sc_min(m_len, a.length());
    int i = 0;
    for (; i < minlen; ++i) {
        set(i, sc_logic(a.get_bit(i)).to_bool());
    }
    for (; i < m_len; ++i) {
        // zero extension
        set(i, 0);
    }
    extend_sign();
    return *this;
}

sc_int_base &
sc_int_base::operator = (const char *a)
{
    if (a == 0) {
        SC_REPORT_ERROR(sc_core::SC_ID_CONVERSION_FAILED_,
                        "character string is zero");
    } else if (*a == 0) {
        SC_REPORT_ERROR(sc_core::SC_ID_CONVERSION_FAILED_,
                        "character string is empty");
    } else try {
        int len = m_len;
        sc_fix aa(a, len, len, SC_TRN, SC_WRAP, 0, SC_ON);
        return this->operator = (aa);
    } catch(const sc_core::sc_report &) {
        std::stringstream msg;
        msg << "character string '" << a << "' is not valid";
        SC_REPORT_ERROR(sc_core::SC_ID_CONVERSION_FAILED_, msg.str().c_str());
    }
    return *this;
}

// explicit conversion to character string
const std::string
sc_int_base::to_string(sc_numrep numrep) const
{
    int len = m_len;
    sc_fix aa(*this, len, len, SC_TRN, SC_WRAP, 0, SC_ON);
    return aa.to_string(numrep);
}

const std::string
sc_int_base::to_string(sc_numrep numrep, bool w_prefix) const
{
    int len = m_len;
    sc_fix aa(*this, len, len, SC_TRN, SC_WRAP, 0, SC_ON);
    return aa.to_string(numrep, w_prefix);
}


// reduce methods
bool sc_int_base::and_reduce() const { return (m_val == int_type(-1)); }
bool sc_int_base::or_reduce() const { return (m_val != int_type(0)); }

bool
sc_int_base::xor_reduce() const
{
    uint_type mask = ~UINT_ZERO;
    uint_type val = m_val & (mask >> m_ulen);
    int n = SC_INTWIDTH;
    do {
        n >>= 1;
        mask >>= n;
        val = ((val & (mask << n)) >> n) ^ (val & mask);
    } while (n != 1);
    return (val != uint_type(0));
}

bool
sc_int_base::concat_get_ctrl(sc_digit *dst_p, int low_i) const
{
    int dst_i; // Word in dst_p now processing.
    int end_i; // Highest order word in dst_p to process.
    int left_shift; // Left shift for val.
    uint_type mask; // Mask for bits to extract or keep.

    dst_i = low_i / BITS_PER_DIGIT;
    left_shift = low_i % BITS_PER_DIGIT;
    end_i = (low_i + (m_len - 1)) / BITS_PER_DIGIT;

    mask = ~(~UINT_ZERO << left_shift);
    dst_p[dst_i] = (sc_digit)(dst_p[dst_i] & mask);
        dst_i++;
        for (; dst_i <= end_i; dst_i++)
            dst_p[dst_i] = 0;
        return false;
}

//-----------------------------------------------------------------------------
//"sc_int_base::concat_get_data"
//
// This method transfers the value of this object instance to the supplied
// array of sc_unsigned digits starting with the bit specified by low_i within
// the array of digits.
//
// Notes:
//   (1) we don't worry about masking the high order data we transfer since
//       concat_get_data() is called from low order bit to high order bit. So
//       the bits above where we place ours will be filled in by someone else.
//
//   dst_p -> array of sc_unsigned digits to be filled in.
//   low_i =  first bit within dst_p to be set.
//-----------------------------------------------------------------------------
bool
sc_int_base::concat_get_data(sc_digit *dst_p, int low_i) const
{
    int dst_i; // Word in dst_p now processing.
    int end_i; // Highest order word in dst_p to process.
    int high_i; // Index of high order bit in dst_p to set.
    int left_shift; // Left shift for val.
    uint_type mask; // Mask for bits to extract or keep.
    bool non_zero; // True if value inserted is non-zero.
    uint_type val; // Value for this object.

    dst_i = low_i / BITS_PER_DIGIT;
    left_shift = low_i % BITS_PER_DIGIT;
    high_i = low_i + (m_len - 1);
    end_i = high_i / BITS_PER_DIGIT;
    val = m_val;
    non_zero = val != 0;

    // MASK OFF DATA TO BE TRANSFERRED BASED ON WIDTH:
    if (m_len < 64) {
        mask = ~(~UINT_ZERO << m_len);
        val &=  mask;
    }

    // PROCESS THE FIRST WORD:
    mask = (~UINT_ZERO << left_shift);
    dst_p[dst_i] = (sc_digit)((dst_p[dst_i] & ~mask) |
            ((val <<left_shift) & DIGIT_MASK));
    switch (end_i - dst_i) {
      // BITS ARE ACROSS TWO WORDS:
      case 1:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i] = (sc_digit)val;
        break;

      // BITS ARE ACROSS THREE WORDS:
      case 2:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i++] = ((sc_digit)val) & DIGIT_MASK;
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (sc_digit)val;
        break;

      // BITS ARE ACROSS FOUR WORDS:
      case 3:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (sc_digit)val;
        break;
    }
    return non_zero;
}

// #### OPTIMIZE
void
sc_int_base::concat_set(int64 src, int low_i)
{
    *this = (low_i < 64) ? src >> low_i : src >> 63;
}

void
sc_int_base::concat_set(const sc_signed &src, int low_i)
{
    if (low_i < src.length())
        *this = src >> low_i;
    else
        *this = (src < 0) ? (int_type)-1 : 0;
}

void
sc_int_base::concat_set(const sc_unsigned &src, int low_i)
{
    if (low_i < src.length())
        *this = src >> low_i;
    else
        *this = 0;
}

void
sc_int_base::concat_set(uint64 src, int low_i)
{
    *this = (low_i < 64) ? src >> low_i : 0;
}

// other methods
void
sc_int_base::scan(::std::istream &is)
{
    std::string s;
    is >> s;
    *this = s.c_str();
}

} // namespace sc_dt;