sc_int_base.cpp

system C源码 一种替代verilog的语言

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

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2006 by all Contributors.
  All Rights reserved.

  The contents of this file are subject to the restrictions and limitations
  set forth in the SystemC Open Source License Version 2.4 (the "License");
  You may not use this file except in compliance with such restrictions and
  limitations. You may obtain instructions on how to receive a copy of the
  License at http://www.systemc.org/. Software distributed by Contributors
  under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
  ANY KIND, either express or implied. See the License for the specific
  language governing rights and limitations under the License.

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

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

  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 1.1.1.1  2006/12/15 20:31:36  acg
// SystemC 2.2
//
// 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 "sysc/kernel/sc_macros.h"
#include "sysc/datatypes/int/sc_signed.h"
#include "sysc/datatypes/int/sc_unsigned.h"
#include "sysc/datatypes/int/sc_int_base.h"
#include "sysc/datatypes/int/sc_uint_base.h"
#include "sysc/datatypes/int/sc_signed.h"
#include "sysc/datatypes/int/sc_int_ids.h"
#include "sysc/datatypes/bit/sc_bv_base.h"
#include "sysc/datatypes/bit/sc_lv_base.h"
#include "sysc/datatypes/misc/sc_concatref.h"
#include "sysc/datatypes/fx/sc_fix.h"
#include "sysc/datatypes/fx/scfx_other_defs.h"


namespace sc_dt
{

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

void
sc_int_concref_invalid_length( int length )
{
    char msg[BUFSIZ];
    std::sprintf( msg,
	     "sc_int_concref<T1,T2> initialization: length = %d "
	     "violates 1 <= length <= %d",
	     length, SC_INTWIDTH );
    SC_REPORT_ERROR( sc_core::SC_ID_OUT_OF_BOUNDS_, msg );
}


// ----------------------------------------------------------------------------
//  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.
    sc_digit  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] = (unsigned long)(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.
    sc_digit  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 = ~(-1 << left_shift);
    dst_p[dst_i] = (unsigned long)((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] = (unsigned long)(val & DIGIT_MASK);
        break;

     // BITS ARE ACROSS THREE WORDS:

     case 2:
        dst_i++;
        val >>= (BITS_PER_DIGIT-left_shift);
        dst_p[dst_i++] = (unsigned long)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (unsigned long)val;
        break;

     // BITS ARE ACROSS FOUR WORDS:

     case 3:
        dst_i++;
        val >>= (BITS_PER_DIGIT-left_shift);
        dst_p[dst_i++] = (unsigned long)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i++] = (unsigned long)val;
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (unsigned long)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
{
    char msg[BUFSIZ];
    std::sprintf( msg,
	     "sc_int[_base] initialization: length = %d violates "
	     "1 <= length <= %d",
	     m_len, SC_INTWIDTH );
    SC_REPORT_ERROR( sc_core::SC_ID_OUT_OF_BOUNDS_, msg );
}

void