sc_int_base.cpp

来自「基于4个mips核的noc设计」· C++ 代码 · 共 377 行

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

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2002 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 2.3 (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:
    
 *****************************************************************************/


#include "systemc/kernel/sc_macros.h"
#include "systemc/datatypes/int/sc_signed.h"
#include "systemc/datatypes/int/sc_unsigned.h"
#include "systemc/datatypes/int/sc_int_base.h"
#include "systemc/datatypes/int/sc_int_ids.h"
#include "systemc/datatypes/bit/sc_bv_base.h"
#include "systemc/datatypes/bit/sc_lv_base.h"
#include "systemc/datatypes/fx/sc_fix.h"
#include "systemc/datatypes/fx/scfx_other_defs.h"
#include "systemc/utils/sc_exception.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];
    sprintf( msg,
	     "sc_int_concref<T1,T2> initialization: length = %d "
	     "violates 1 <= length <= %d",
	     length, SC_INTWIDTH );
    SC_REPORT_ERROR( SC_ID_OUT_OF_BOUNDS_, msg );
}


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

// other methods

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


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

// assignment operators
  
sc_int_subref& 
sc_int_subref::operator = ( int_type v )
{
    int_type val = m_obj.m_val;
    uint_type mask = mask_int[m_left][m_right];
    val &= mask;
    val |= (v << m_right) & ~mask;
    m_obj.m_val = val;
    m_obj.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 );
}


// other methods

void
sc_int_subref::scan( istream& is )
{
    sc_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];
    sprintf( msg,
	     "sc_int[_base] initialization: length = %d violates "
	     "1 <= length <= %d",
	     m_len, SC_INTWIDTH );
    SC_REPORT_ERROR( SC_ID_OUT_OF_BOUNDS_, msg );
}

void
sc_int_base::invalid_index( int i ) const
{
    char msg[BUFSIZ];
    sprintf( msg,
	     "sc_int[_base] bit selection: index = %d violates "
	     "0 <= index <= %d",
	     i, m_len - 1 );
    SC_REPORT_ERROR( SC_ID_OUT_OF_BOUNDS_, msg );
}

void
sc_int_base::invalid_range( int l, int r ) const
{
    char msg[BUFSIZ];
    sprintf( msg,
	     "sc_int[_base] part selection: left = %d, right = %d violates "
	     "0 <= right <= left <= %d",
	     l, r, m_len - 1 );
    SC_REPORT_ERROR( SC_ID_OUT_OF_BOUNDS_, msg );
}


void
sc_int_base::check_value() const
{
    int_type limit = (int_type) 1 << ( m_len - 1 );
    if( m_val < -limit || m_val >= limit ) {
	char msg[BUFSIZ];
	sprintf( msg, "sc_int[_base]: value does not fit into a length of %d",
		 m_len );
	SC_REPORT_WARNING( SC_ID_OUT_OF_BOUNDS_, msg );
    }
}


// constructors

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();
    for( int i = m_len - 1; i >= 0; -- i ) {
	set( i, a.test( i ) );
    }
    extend_sign();
}

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();
    for( int i = m_len - 1; i >= 0; -- i ) {
	set( i, a.test( i ) );
    }
    extend_sign();
}


// 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_ID_CONVERSION_FAILED_,
			 "character string is zero" );
    }
    if( *a == 0 ) {
	SC_REPORT_ERROR( SC_ID_CONVERSION_FAILED_,
			 "character string is empty" );
    }
    try {
	int len = m_len;
	sc_fix aa( a, len, len, SC_TRN, SC_WRAP, 0, SC_ON );
	return this->operator = ( aa );
    } catch( sc_exception ) {
	char msg[BUFSIZ];
	sprintf( msg, "character string '%s' is not valid", a );
	SC_REPORT_ERROR( SC_ID_CONVERSION_FAILED_, msg );
	// never reached
	return *this;
    }
}


// explicit conversion to character string

const sc_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 sc_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 ) );
}


// other methods

void
sc_int_base::scan( istream& is )
{
    sc_string s;
    is >> s;
    *this = s.c_str();
}

} // namespace sc_dt;


// Taf!