source: sources/src/sc_int.h @ 28

/*------------------------------------------------------------\
|                                                             |
| Tool    :                  systemcass                       |
|                                                             |
| File    :                 sc_int.h                          |
|                                                             |
| Author  :                 Buchmann Richard                  |
|                                                             |
| Date    :                   09_07_2004                      |
|                                                             |
\------------------------------------------------------------*/
#ifndef __SC_INT_H__
#define __SC_INT_H__

#include <data_field.h>
#include <sc_numrep.h>
#include <sc_bit.h>
#include <sc_logic.h>
#include <sc_bv.h>
#include <cstdlib>

// ----------------------------------------------------------------------------
//  CLASS : sc_int<W>
//
//  Template class sc_int<W> is the interface that the user sees. It is
//  derived from sc_int_base and most of its methods are just wrappers
//  that call the corresponding method in the parent class. Note that
//  the width of sc_int datatype is specified as a template parameter.
// ----------------------------------------------------------------------------

#include "sc_nbdefs.h"

namespace sc_dt {

typedef sc_int<1> sc_int_bit_ref;
typedef sc_int<1> sc_int_bit_ref_r;

//
#define MASK32(W) ((~ (const uint32)0) >> (sizeof (uint32) * 8 - W))
#define MASK64(W) ((~ (const uint64)0) >> (sizeof (uint64) * 8 - W))
//

template<int W> struct s_int_type { typedef int64 int_type;};
#define DECLAR_INT_TYPE(W) template<> struct s_int_type<W> { typedef smallest_int int_type; } // not declared as in8 because << operator threats like a character
DECLAR_INT_TYPE( 1);
DECLAR_INT_TYPE( 2);
DECLAR_INT_TYPE( 3);
DECLAR_INT_TYPE( 4);
DECLAR_INT_TYPE( 5);
DECLAR_INT_TYPE( 6);
DECLAR_INT_TYPE( 7);
DECLAR_INT_TYPE( 8);
#undef DECLAR_INT_TYPE
#define DECLAR_INT_TYPE(W) template<> struct s_int_type<W> { typedef int16 int_type; }
DECLAR_INT_TYPE( 9);
DECLAR_INT_TYPE(10);
DECLAR_INT_TYPE(11);
DECLAR_INT_TYPE(12);
DECLAR_INT_TYPE(13);
DECLAR_INT_TYPE(14);
DECLAR_INT_TYPE(15);
DECLAR_INT_TYPE(16);
#undef DECLAR_INT_TYPE
#define DECLAR_INT_TYPE(W) template<> struct s_int_type<W> { typedef int32 int_type; }
DECLAR_INT_TYPE(17);
DECLAR_INT_TYPE(18);
DECLAR_INT_TYPE(19);
DECLAR_INT_TYPE(20);
DECLAR_INT_TYPE(21);
DECLAR_INT_TYPE(22);
DECLAR_INT_TYPE(23);
DECLAR_INT_TYPE(24);
DECLAR_INT_TYPE(25);
DECLAR_INT_TYPE(26);
DECLAR_INT_TYPE(27);
DECLAR_INT_TYPE(28);
DECLAR_INT_TYPE(29);
DECLAR_INT_TYPE(30);
DECLAR_INT_TYPE(31);
DECLAR_INT_TYPE(32);
#undef DECLAR_INT_TYPE

// --------------------------------
// CLASS : sc_int_subref_r
//
// Used for range, concat functions

class sc_int_subref_r
{
  template <int W> friend class sc_dt::sc_int;
  int       left, right;
  public : int64    val;
  sc_int_subref_r (int64 val_, int left_, int right_)
  {
    val = val_; left = left_; right = right_;
  }
  public:
  inline int64 read () const { return val; }
  inline const sc_int_subref_r& operator | (const sc_int_subref_r &v) const
  { print_warning (); return *this; }

  private :void print_warning () const;
};

//
// to fix : propagation of the sign flag
//

class sc_int_subref_r;

template< int W /* = SC_INTWIDTH */>
class sc_int
{
  /***********************/
  /* SYSTEMCASS SPECIFIC */
  /***********************/
  typedef sc_int<W>                         this_type;
  typedef typename s_int_type<W>::int_type  data_type;

  typedef data_type sc_int_subref;
//typedef data_type sc_int_subref_r;
    /* removed since "operator ," was going wrong */

// internal
        union {
    val_field<W,(sizeof (data_type) * 8) - W,data_type> vf; /* To compute */
                data_type val;          /* To return an int reference (read function) */
//        data_type valW:W; /* works with little endianess only */
//  bool      valB[W]; /* removed since 1 bool takes 1 byte */
        };

  /***********************/
  /*        L R M        */
  /***********************/
public:
  sc_int()                 { val = 0; }
//  sc_int(data_type val_)  { val = 0; write (val_); }
  sc_int (const char *a)   { val = 0; write (std::atoi (a)); }
  sc_int (unsigned short a){ val = 0; write (a); }
  sc_int (short a)         { val = 0; write (a); }
  sc_int (unsigned long a) { val = 0; write (a); }
  sc_int (long a)          { val = 0; write (a); }
  sc_int (unsigned int a)  { val = 0; write (a); }
  sc_int (int a)           { val = 0; write (a); }
  sc_int (int64 a)         { val = 0; write (a); }
  sc_int (uint64 a)        { val = 0; write (a); }
  sc_int (double a)        { val = 0; write (a); }

  template <int W2> sc_int (const sc_int<W2> &val_) { val = 0; write (val_.read());}
  /* this template doesn't redefine default copy constructor of sc_int.
   * So, we define by this way 
   */

  sc_int (const sc_int &val_) { val = val_.val; }
  sc_int (const sc_int_subref_r &a) { val = 0; write (a); } 
    /* the user needs to cast explicitly result of range () method. */

  /***********************/
  /* SYSTEMCASS SPECIFIC */
  /***********************/
#if 0
  bool is_negative () const {
    return (valW >> (W-1)) == 1;
  }
#endif
  // read/write
  inline const data_type& read() const { return val; }
  inline void write(data_type val_)    { vf.valW = val_; }
  template <int W2> inline void write (const sc_int<W2> val_) { write (val_.read ()); }
//inline void write (const sc_int<W> val_) { write (val_.read()); };
  inline void write (const sc_int_subref_r& s) { write (s.read()); }

  /***********************/
  /*        L R M        */
  /***********************/
  // operators
  inline operator const data_type& () const { return read (); }
//  inline void write(int64 val_) { val = val_ & MASK64(W); }
//  inline void write(signed int val_)   { val = val_ & MASK32(W); }
        template <typename T> inline sc_int& operator = (const T& val_) 
  { write (val_); return *this; }
        inline sc_int& operator = (const sc_int_subref_r& a) 
  { write (a); return *this; }

  // explicit conversions
  inline uint32         to_uint   () const {return val & MASK32(W);};
  inline int32          to_int    () const {return val & MASK32(W);};
  inline uint64         to_uint64 () const {return val & MASK64(W);};
  inline int64          to_int64  () const {return val & MASK64(W);};

  // explicit conversion to character string 
  const sc_string to_string       ( sc_numrep numrep = SC_DEC ) const 
  { return sc_dt::to_string (val, W, numrep); }
  const sc_string to_dec() const  { return to_string (SC_DEC); }
  const sc_string to_bin() const  { return to_string (SC_BIN); }
  const sc_string to_oct() const  { return to_string (SC_OCT); }
  const sc_string to_hex() const  { return to_string (SC_HEX); }

  // arithmetic
#define DEFINE_OPERATOR(OPER)        \
  template <typename T>              \
  inline sc_int& operator OPER (T v) \
  { vf.valW OPER v; return *this; }

  DEFINE_OPERATOR(<<=)
  DEFINE_OPERATOR(>>=)
  DEFINE_OPERATOR(+=)
  DEFINE_OPERATOR(-=)
  DEFINE_OPERATOR(*=)
  DEFINE_OPERATOR(/=)
  DEFINE_OPERATOR(%=)
  DEFINE_OPERATOR(&=)
  DEFINE_OPERATOR(|=)
  DEFINE_OPERATOR(^=)
#undef DEFINE_OPERATOR

  inline sc_int_bit_ref& operator [] (int v)
  { return (vf.valW >> v) & 1; }
  inline sc_int_bit_ref_r& operator [] (int v) const
  { return (vf.valW >> v) & 1; }

  template <int W2> 
  inline sc_int<W+W2> operator , (const sc_int<W2> &b) const
  { sc_int<W+W2> res = read() << W2; res += b.read(); return res; }
#if 0 
std::cerr << "[" << to_bin() << "," << b.to_bin() << " = " << res.to_bin() << "]\n"; 
#endif

  inline sc_int<W+1> operator , (bool b) const
  { sc_int<W+1> res = read(); res <<= 1; res += b; return res; }
#if 0 
std::cerr << "[" << to_bin() << "," << b.to_bin() << " = " << res.to_bin() << "]\n"; 
#endif

  template <int W2>
  inline sc_int<W2> operator , (const sc_int_subref_r &v) const
  { std::cerr << "Warning : \n"; return sc_int<W2> (v.read()); }

  inline sc_int_subref range (int left, int right)
  { return (data_type)((data_type) (((data_type)~(0)) >> (sizeof (data_type) * 8 - left - 1)) & val) >> right; }

  inline sc_int_subref_r range (int left, int right) const
  { return sc_int_subref_r (((data_type) (((data_type)~(0)) >> (sizeof (data_type) * 8 - left - 1)) & val) >> right, left, right); }
#if 0
std::cerr << "range(" << left << "," << right << ")\n";
std::cerr << "val = " << val << "\n";
std::cerr << "~0 >> " << (sizeof (data_type) * 8 - left - 1) << " = " << (data_type) (((data_type)~(0)) >> (sizeof (data_type) * 8 - left - 1)) << "\n";
std::cerr <<  ((data_type) ((((data_type)~(0)) >> (sizeof (data_type) * 8 - left - 1)) & val) >> right) << "\n";
std::cerr << "data_type = " << sizeof (data_type) << "\n";
#endif

};

inline std::ostream& operator << (std::ostream &o, const sc_int_subref_r& s)
{ return o << s.val; }

} /* end of sc_dt namespace */

#endif /* __SC_INT_H__ */