sc_bit.hh

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

  sc_bit.h -- Bit class.

  Original Author: Stan Y. Liao, Synopsys, Inc.

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

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

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// $Log: sc_bit.h,v $
// Revision 1.2  2011/08/07 18:54:19  acg
//  Philipp A. Hartmann: remove friend function declarations that implement
//  code, and clean up how bit and logic operators are defined in general.
//
// Revision 1.1.1.1  2006/12/15 20:20:04  acg
// SystemC 2.3
//
// Revision 1.6  2006/05/08 17:49:59  acg
//   Andy Goodrich: Added David Long's declarations for friend operators,
//   functions, and methods, to keep the Microsoft compiler happy.
//
// Revision 1.5  2006/04/12 20:17:52  acg
//  Andy Goodrich: enabled deprecation message for sc_bit.
//
// Revision 1.4  2006/01/24 20:50:55  acg
// Andy Goodrich: added warnings indicating that sc_bit is deprecated and that
// the C bool data type should be used in its place.
//
// Revision 1.3  2006/01/13 18:53:53  acg
// Andy Goodrich: added $Log command so that CVS comments are reproduced in
// the source.
//

#ifndef __SYSTEMC_EXT_DT_BIT_SC_BIT_HH__
#define __SYSTEMC_EXT_DT_BIT_SC_BIT_HH__

#include <iostream>

#include "../int/sc_nbdefs.hh"

namespace sc_dt
{

// classes defined in this module
class sc_bit;

// forward class declarations
class sc_logic;

extern void sc_deprecated_sc_bit();

// ----------------------------------------------------------------------------
//  CLASS : sc_bit
//
//  Bit class.
//  Note: VSIA compatibility indicated.
// ----------------------------------------------------------------------------

class sc_bit
{
    // support methods

    static void invalid_value(char);
    static void invalid_value(int);

    static bool
    to_value(char c)
    {
        if (c != '0' && c != '1') {
            invalid_value(c);
        }
        return (c == '0' ? false : true);
    }

    static bool
    to_value(int i)
    {
        if (i != 0 && i != 1) {
            invalid_value(i);
        }
        return (i == 0 ? false : true);
    }
    static bool to_value(bool b) { return b; }

#define DEFN_TO_VALUE_T(tp) \
    static bool to_value(tp i) { return to_value((int)i); }

    DEFN_TO_VALUE_T(unsigned)
    DEFN_TO_VALUE_T(long)
    DEFN_TO_VALUE_T(unsigned long)
    DEFN_TO_VALUE_T(int64)
    DEFN_TO_VALUE_T(uint64)

#undef DEFN_TO_VALUE_T

  public:
    // constructors
    // MANDATORY
    sc_bit() : m_val(false) { sc_deprecated_sc_bit(); }

#define DEFN_CTOR_T(tp)              \
    explicit sc_bit(tp a) : m_val(to_value(a)) { sc_deprecated_sc_bit(); }

    DEFN_CTOR_T(bool)
    DEFN_CTOR_T(char)
    DEFN_CTOR_T(int)
    DEFN_CTOR_T(unsigned)
    DEFN_CTOR_T(long)
    DEFN_CTOR_T(unsigned long)
    DEFN_CTOR_T(int64)
    DEFN_CTOR_T(uint64)

#undef DEFN_CTOR_T

    explicit sc_bit(const sc_logic &a);  // non-VSIA

    // copy constructor
    // MANDATORY
    sc_bit(const sc_bit &a) : m_val(a.m_val) {}

    // destructor
    // MANDATORY
    ~sc_bit() {}

    // assignment operators
    // MANDATORY
    sc_bit &
    operator = (const sc_bit &b)
    {
        m_val = b.m_val;
        return *this;
    }

#define DEFN_ASN_OP_T(op, tp) \
    sc_bit &operator op(tp b) { return (*this op sc_bit(b)); }
#define DEFN_ASN_OP(op) \
    DEFN_ASN_OP_T(op,int) \
    DEFN_ASN_OP_T(op,bool) \
    DEFN_ASN_OP_T(op,char)

    DEFN_ASN_OP(=)
    DEFN_ASN_OP_T(=,int64)
    DEFN_ASN_OP_T(=,uint64)
    DEFN_ASN_OP_T(=,long)
    DEFN_ASN_OP_T(=,unsigned long)

    sc_bit &operator = (const sc_logic &b); // non-VSIA

    // bitwise assignment operators
    sc_bit &
    operator &= (const sc_bit &b)
    {
        m_val = (m_val && b.m_val);
        return *this;
    }

    sc_bit &
    operator |= (const sc_bit &b)
    {
        m_val = (m_val || b.m_val);
        return *this;
    }

    sc_bit &
    operator ^= (const sc_bit &b)
    {
        m_val = (m_val != b.m_val);
        return *this;
    }

    DEFN_ASN_OP(&=)
    DEFN_ASN_OP(|=)
    DEFN_ASN_OP(^=)

#undef DEFN_ASN_OP_T
#undef DEFN_ASN_OP

    // conversions
    // MANDATORY

    // implicit conversion to bool
    operator bool () const { return m_val; }

    // non-VSIA
    bool operator ! () const { return !m_val; }


    // explicit conversions - non-VSIA
    bool to_bool() const { return m_val; }
    char to_char() const { return (m_val ? '1' : '0'); }

    // relational operators and functions
    // MANDATORY
    friend bool operator == (const sc_bit &a, const sc_bit &b);
    friend bool operator != (const sc_bit &a, const sc_bit &b);

    // bitwise operators and functions

    // bitwise complement
    // MANDATORY
    friend const sc_bit operator ~ (const sc_bit &a);

    // RECOMMENDED
    sc_bit &
    b_not()
    {
        m_val = (!m_val);
        return *this;
    }

    // binary bit-wise operations
    friend const sc_bit operator | (const sc_bit &a, const sc_bit &b);
    friend const sc_bit operator & (const sc_bit &a, const sc_bit &b);
    friend const sc_bit operator ^ (const sc_bit &a, const sc_bit &b);

    // other methods
    void print(::std::ostream &os=::std::cout) const { os << to_bool(); }
    void scan(::std::istream & =::std::cin);

  private:
    bool m_val;
};

// ----------------------------------------------------------------------------
// relational operators and functions

#define DEFN_BIN_FUN_T(ret,fun,tp) \
    inline ret fun(const sc_bit& a, tp b) { return fun(a, sc_bit(b)); } \
    inline ret fun(tp b, const sc_bit &a) { return fun(sc_bit(a), b); }

#define DEFN_BIN_FUN(ret,fun) \
      DEFN_BIN_FUN_T(ret,fun,bool) \
      DEFN_BIN_FUN_T(ret,fun,char) \
      DEFN_BIN_FUN_T(ret,fun,int)

// MANDATORY
inline bool
operator == (const sc_bit &a, const sc_bit &b)
{
    return (a.m_val == b.m_val);
}

inline bool
operator != (const sc_bit &a, const sc_bit &b)
{
    return (a.m_val != b.m_val);
}

DEFN_BIN_FUN(bool, operator ==)
DEFN_BIN_FUN(bool, operator !=)

// OPTIONAL

inline bool equal(const sc_bit &a, const sc_bit &b) { return (a == b); }

inline bool not_equal(const sc_bit &a, const sc_bit &b) { return (a != b); }

DEFN_BIN_FUN(bool,equal)
DEFN_BIN_FUN(bool,not_equal)

// ----------------------------------------------------------------------------
// bitwise operators and functions

// bitwise complement

// MANDATORY
inline const sc_bit operator ~ (const sc_bit &a) { return sc_bit(!a.m_val); }

// OPTIONAL
inline const sc_bit b_not(const sc_bit &a) { return (~a); }

// RECOMMENDED
inline void b_not(sc_bit &r, const sc_bit &a) { r = (~a); }

// binary bit-wise operations
// MANDATORY
inline const sc_bit
operator & (const sc_bit &a, const sc_bit &b)
{
    return sc_bit(a.m_val && b.m_val);
}

inline const sc_bit
operator | (const sc_bit &a, const sc_bit &b)
{
    return sc_bit(a.m_val || b.m_val);
}

inline const sc_bit
operator ^ (const sc_bit &a, const sc_bit &b)
{
    return sc_bit(a.m_val != b.m_val);
}

DEFN_BIN_FUN(const sc_bit,operator&)
DEFN_BIN_FUN(const sc_bit,operator|)
DEFN_BIN_FUN(const sc_bit,operator^)

// OPTIONAL
inline const sc_bit b_and(const sc_bit &a, const sc_bit &b) { return a & b; }
inline const sc_bit b_or(const sc_bit &a, const sc_bit &b) { return a | b; }
inline const sc_bit b_xor(const sc_bit &a, const sc_bit &b) { return a ^ b; }

DEFN_BIN_FUN(const sc_bit,b_and)
DEFN_BIN_FUN(const sc_bit,b_or)
DEFN_BIN_FUN(const sc_bit,b_xor)

// RECOMMENDED

#define DEFN_TRN_FUN_T(fun,tp) \
    inline void \
    fun(sc_bit &r, const sc_bit &a, tp b) \
    { r = fun(a, sc_bit(b)); } \
    inline void \
    fun(sc_bit &r, tp a, const sc_bit &b) \
    { r = fun(sc_bit(a), b); }

#define DEFN_TRN_FUN(fun) \
    inline void \
    fun(sc_bit &r, const sc_bit &a, const sc_bit &b) { r = fun(a , b); } \
    DEFN_TRN_FUN_T(fun, int) \
    DEFN_TRN_FUN_T(fun, bool) \
    DEFN_TRN_FUN_T(fun, char)

    DEFN_TRN_FUN(b_and)
    DEFN_TRN_FUN(b_or)
    DEFN_TRN_FUN(b_xor)

#undef DEFN_BIN_FUN_T
#undef DEFN_BIN_FUN
#undef DEFN_TRN_FUN_T
#undef DEFN_TRN_FUN


// ----------------------------------------------------------------------------

inline ::std::ostream &
operator << (::std::ostream &os, const sc_bit &a)
{
    a.print(os);
    return os;
}

inline ::std::istream &
operator >> (::std::istream &is, sc_bit &a)
{
    a.scan(is);
    return is;
}

} // namespace sc_dt

#endif // __SYSTEMC_EXT_DT_BIT_SC_BIT_HH__