sc_concatref.hh

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

  sc_concatref.h -- Concatenation support.

  Original Author: Andy Goodrich, Forte Design, Inc.

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

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

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

      Name, Affiliation, Date:
  Description of Modification:

  Andy Goodrich, Forte Design Systems, 17 Nov 2002
  Creation of sc_concatref class by merging the capabilities of
  sc_int_concref, sc_int_concref, sc_uint_concref, sc_uint_concref,
  and implementing the capabilities of sc_signed_concref, sc_signed_concref,
  sc_unsigned_concref, and sc_unsigned_concref. The resultant class allows
  mixed mode concatenations on the left and right sides of an assignment.

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

// $Log: sc_concatref.h,v $
// Revision 1.6  2011/08/24 22:05:48  acg
//  Torsten Maehne: initialization changes to remove warnings.
//
// Revision 1.5  2009/11/17 19:58:15  acg
//  Andy Goodrich: fix of shift rhs possibilities to include "int".
//
// Revision 1.4  2009/02/28 00:26:29  acg
//  Andy Goodrich: bug fixes.
//
// Revision 1.3  2008/04/29 20:23:55  acg
//  Andy Goodrich: fixed the code that assigns the value of a string to
//  an sc_concatref instance.
//
// Revision 1.2  2008/02/14 20:57:26  acg
//  Andy Goodrich: added casts to ~0 instances to keep MSVC compiler happy.
//
// Revision 1.1.1.1  2006/12/15 20:20:05  acg
// SystemC 2.3
//
// Revision 1.4  2006/10/23 19:36:59  acg
//  Andy Goodrich: changed casts for operations on concatenation values to
//  mirror those of sc_unsigned. For instance, an sc_unsigned minus a value
//  returns an sc_signed result, whereas an sc_concatref minus a value was
//  returning an sc_unsigned result. Now both sc_unsigned and sc_concatref
//  minus a value return an sc_signed result.
//
// Revision 1.3  2006/01/13 18:54:01  acg
// Andy Goodrich: added $Log command so that CVS comments are reproduced in
// the source.
//

#ifndef __SYSTEMC_EXT_DT_MISC_SC_CONCATREF_HH__
#define __SYSTEMC_EXT_DT_MISC_SC_CONCATREF_HH__

#include <iostream>

#include "../bit/sc_bv.hh"
#include "../bit/sc_lv.hh"
#include "../int/sc_int_base.hh"
#include "../int/sc_signed.hh"
#include "../int/sc_uint_base.hh"
#include "../int/sc_unsigned.hh"
#include "../sc_temporary.hh"
#include "sc_value_base.hh"

namespace sc_dt
{

// classes defined in this module
class sc_concatref;
class sc_concat_bool;

} // namespace sc_dt

namespace sc_core
{

extern sc_byte_heap sc_temp_heap; // Temporary storage.

// explicit template instantiations
extern template class sc_vpool<sc_dt::sc_concatref>;
extern template class sc_vpool<sc_dt::sc_concat_bool>;

} // namespace sc_core

namespace sc_dt {

// ----------------------------------------------------------------------------
//  CLASS TEMPLATE : sc_concatref
//
//  Proxy class for sized bit concatenation.
// ----------------------------------------------------------------------------

class sc_concatref : public sc_generic_base<sc_concatref>, public sc_value_base
{
  public:
    friend class sc_core::sc_vpool<sc_concatref>;

    inline void
    initialize(sc_value_base &left, sc_value_base &right)
    {
        bool left_xz; // True if x's and/or z's found in left.
        bool right_xz; // True if x's and/or z's found in right.

        m_left_p = (sc_value_base *)&left;
        m_right_p = (sc_value_base *)&right;
        m_len_r = right.concat_length(&right_xz);
        m_len = left.concat_length(&left_xz) + m_len_r;
        m_flags = (left_xz || right_xz) ? cf_xz_present : cf_none;
    }


    inline void
    initialize(const sc_value_base &left, const sc_value_base &right)
    {
        bool left_xz;   // True if x's and/or z's found in left.
        bool right_xz;  // True if x's and/or z's found in right.

        m_left_p = (sc_value_base *)&left;
        m_right_p = (sc_value_base *)&right;
        m_len_r = right.concat_length(&right_xz);
        m_len = left.concat_length(&left_xz) + m_len_r;
        m_flags = (left_xz || right_xz) ? cf_xz_present : cf_none;
    }

    // destructor
    virtual ~sc_concatref() {}

    // capacity
    unsigned int length() const { return m_len; }

    // concatenation
    virtual int
    concat_length(bool *xz_present_p) const
    {
        if (xz_present_p)
            *xz_present_p = m_flags & cf_xz_present ? true : false;
        return m_len;
    }

    virtual void
    concat_clear_data(bool to_ones)
    {
        m_left_p->concat_clear_data(to_ones);
        m_right_p->concat_clear_data(to_ones);
    }

    virtual bool
    concat_get_ctrl(sc_digit *dst_p, int low_i) const
    {
        bool rnz = m_right_p->concat_get_ctrl(dst_p, low_i);
        bool lnz = m_left_p->concat_get_ctrl(dst_p, low_i + m_len_r);
        return rnz || lnz;
    }

    virtual bool
    concat_get_data(sc_digit *dst_p, int low_i) const
    {
        bool rnz = m_right_p->concat_get_data(dst_p, low_i);
        bool lnz = m_left_p->concat_get_data(dst_p, low_i + m_len_r);
        return rnz || lnz;
    }

    virtual uint64
    concat_get_uint64() const
    {
        if (m_len_r >= 64) {
            return m_right_p->concat_get_uint64();
        } else {
            return (m_left_p->concat_get_uint64() << m_len_r) |
                m_right_p->concat_get_uint64();
        }
    }

    virtual void
    concat_set(int64 src, int low_i)
    {
        m_right_p->concat_set(src, low_i);
        m_left_p->concat_set(src, low_i + m_len_r);
    }

    virtual void
    concat_set(const sc_signed &src, int low_i)
    {
        m_right_p->concat_set(src, low_i);
        m_left_p->concat_set(src, low_i + m_len_r);
    }

    virtual void
    concat_set(const sc_unsigned &src, int low_i)
    {
        m_right_p->concat_set(src, low_i);
        m_left_p->concat_set(src, low_i + m_len_r);
    }

    virtual void
    concat_set(uint64 src, int low_i)
    {
        m_right_p->concat_set(src, low_i);
        m_left_p->concat_set(src, low_i + m_len_r);
    }

    // explicit conversions
    uint64
    to_uint64() const
    {
        uint64 mask;
        uint64 result;

        result = m_right_p->concat_get_uint64();
        if (m_len_r < 64) {
            mask = (uint64)~0;
            result = (m_left_p->concat_get_uint64() << m_len_r) |
                        (result & ~(mask << m_len_r));
        }
        if (m_len < 64) {
            mask = (uint64)~0;
            result = result & ~(mask << m_len);
        }
        return result;
    }

    const sc_unsigned &
    value() const
    {
        bool left_non_zero;
        sc_unsigned *result_p = sc_unsigned::m_pool.allocate();
        bool right_non_zero;

        result_p->nbits = result_p->num_bits(m_len);
        result_p->ndigits = DIV_CEIL(result_p->nbits);
        result_p->digit = (sc_digit *)sc_core::sc_temp_heap.allocate(
            sizeof(sc_digit) * result_p->ndigits);
        result_p->digit[result_p->ndigits - 1] = 0;
        right_non_zero = m_right_p->concat_get_data(result_p->digit, 0);
        left_non_zero = m_left_p->concat_get_data(result_p->digit, m_len_r);
        if (left_non_zero || right_non_zero)
            result_p->sgn = SC_POS;
        else
            result_p->sgn = SC_ZERO;
        return *result_p;
    }

    int64 to_int64() const { return (int64)to_uint64(); }
    int to_int() const { return (int)to_int64(); }
    unsigned int to_uint() const { return (unsigned int)to_uint64(); }
    long to_long() const { return (long)to_int64(); }
    unsigned long to_ulong() const { return (unsigned long)to_uint64(); }
    double to_double() const { return value().to_double(); }

    void to_sc_signed(sc_signed &target) const { target = value(); }

    void to_sc_unsigned(sc_unsigned &target) const { target = value(); }

    // implicit conversions:
    operator uint64 () const { return to_uint64(); }

    operator const sc_unsigned & () const { return value(); }

    // unary operators:
    sc_unsigned operator + () const { return value(); }

    sc_signed operator - () const { return -value(); }

    sc_unsigned operator ~ () const { return ~value(); }

    // explicit conversion to character string
    const std::string
    to_string(sc_numrep numrep=SC_DEC) const
    {
        return value().to_string(numrep);
    }

    const std::string
    to_string(sc_numrep numrep, bool w_prefix) const
    {
        return value().to_string(numrep,w_prefix);
    }

    // assignments
    inline const sc_concatref &
    operator = (int v)
    {
        m_right_p->concat_set((int64)v, 0);
        m_left_p->concat_set((int64)v, m_len_r);
        return *this;
    }

    inline const sc_concatref &
    operator = (long v)
    {
        m_right_p->concat_set((int64)v, 0);
        m_left_p->concat_set((int64)v, m_len_r);
        return *this;
    }

    inline const sc_concatref &
    operator = (int64 v)
    {
        m_right_p->concat_set(v, 0);
        m_left_p->concat_set(v, m_len_r);
        return *this;
    }

    inline const sc_concatref &
    operator = (unsigned int v)
    {
        m_right_p->concat_set((uint64)v, 0);
        m_left_p->concat_set((uint64)v, m_len_r);
        return *this;
    }

    inline const sc_concatref &
    operator = (unsigned long v)
    {
        m_right_p->concat_set((uint64)v, 0);
        m_left_p->concat_set((uint64)v, m_len_r);
        return *this;
    }

    inline const sc_concatref &
    operator = (uint64 v)
    {
        m_right_p->concat_set(v, 0);
        m_left_p->concat_set(v, m_len_r);
        return *this;
    }

    const sc_concatref &
    operator = (const sc_concatref &v)
    {
        sc_unsigned temp(v.length());
        temp = v.value();
        m_right_p->concat_set(temp, 0);
        m_left_p->concat_set(temp, m_len_r);
        return *this;
    }

    const sc_concatref &
    operator = (const sc_signed &v)
    {
        m_right_p->concat_set(v, 0);
        m_left_p->concat_set(v, m_len_r);
        return *this;
    }

    const sc_concatref &
    operator = (const sc_unsigned &v)
    {
        m_right_p->concat_set(v, 0);
        m_left_p->concat_set(v, m_len_r);
        return *this;
    }

    const sc_concatref &
    operator = (const char *v_p)
    {
        sc_unsigned v(m_len);
        v = v_p;
        m_right_p->concat_set(v, 0);
        m_left_p->concat_set(v, m_len_r);
        return *this;
    }

    const sc_concatref &
    operator = (const sc_bv_base &v)
    {
        sc_unsigned temp(v.length());
        temp = v;
        m_right_p->concat_set(temp, 0);
        m_left_p->concat_set(temp, m_len_r);
        return *this;
    }

    const sc_concatref &
    operator = (const sc_lv_base &v)
    {
        sc_unsigned data(v.length());
        data = v;
        m_right_p->concat_set(data, 0);
        m_left_p->concat_set(data, m_len_r);
        return *this;
    }

    // reduce methods
    bool and_reduce() const { return value().and_reduce(); }
    bool nand_reduce() const { return value().nand_reduce(); }
    bool or_reduce() const { return value().or_reduce(); }
    bool nor_reduce() const { return value().nor_reduce(); }
    bool xor_reduce() const { return value().xor_reduce(); }
    bool xnor_reduce() const { return value().xnor_reduce(); }

    // other methods
    void print(::std::ostream &os=::std::cout) const { os << this->value(); }

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

  public:
    // Pool of temporary objects.
    static sc_core::sc_vpool<sc_concatref> m_pool;

  public:
    enum concat_flags {
        cf_none = 0,        // Normal value.
        cf_xz_present = 1   // X and/or Z values present.
    };

  protected:
    sc_value_base *m_left_p;  // Left hand operand of concatenation.
    sc_value_base *m_right_p; // Right hand operand of concatenation.
    int m_len;                // Length of concatenation.
    int m_len_r;              // Length of m_rightt_p.
    concat_flags m_flags;     // Value is read only.

  private:
    sc_concatref(const sc_concatref &);
    sc_concatref() : m_left_p(0), m_right_p(0), m_len(0), m_len_r(0), m_flags()
    {}
};

// functional notation for the reduce methods
inline bool and_reduce(const sc_concatref &a) { return a.and_reduce(); }
inline bool nand_reduce(const sc_concatref &a) { return a.nand_reduce(); }
inline bool or_reduce(const sc_concatref &a) { return a.or_reduce(); }
inline bool nor_reduce(const sc_concatref &a) { return a.nor_reduce(); }
inline bool xor_reduce(const sc_concatref &a) { return a.xor_reduce(); }
inline bool xnor_reduce(const sc_concatref &a) { return a.xnor_reduce(); }

// SHIFT OPERATORS FOR sc_concatref OBJECT INSTANCES:
//
// Because sc_concatref has implicit casts to both uint64 and sc_unsigned
// it is necessary to disambiguate the use of the shift operators. We do
// this in favor of sc_unsigned so that precision is not lost. To get an
// integer-based result use a cast to uint64 before performing the shift.

inline const sc_unsigned
operator << (const sc_concatref &target, uint64 shift)
{
    return target.value() << (int)shift;
}

inline const sc_unsigned
operator << (const sc_concatref &target, int64 shift)
{
    return target.value() << (int)shift;
}

inline const sc_unsigned
operator << (const sc_concatref &target, unsigned long shift)
{
    return target.value() << (int)shift;
}

inline const sc_unsigned
operator << (const sc_concatref &target, int shift)
{
    return target.value() << shift;
}

inline const sc_unsigned
operator << (const sc_concatref &target, unsigned int shift)
{
    return target.value() << (int)shift;
}

inline const sc_unsigned
operator << (const sc_concatref &target, long shift)
{
    return target.value() << (int)shift;
}

inline const sc_unsigned
operator >> (const sc_concatref &target, uint64 shift)
{
    return target.value() >> (int)shift;
}

inline const sc_unsigned
operator >> (const sc_concatref &target, int64 shift)
{
    return target.value() >> (int)shift;
}

inline const sc_unsigned
operator >> (const sc_concatref &target, unsigned long shift)
{
    return target.value() >> (int)shift;
}

inline const sc_unsigned
operator >> (const sc_concatref &target, int shift)
{
    return target.value() >> shift;
}

inline const sc_unsigned
operator >> (const sc_concatref &target, unsigned int shift)
{
    return target.value() >> (int)shift;
}

inline const sc_unsigned
operator >> (const sc_concatref &target, long shift)
{
    return target.value() >> (int)shift;
}

// STREAM OPERATORS FOR sc_concatref OBJECT INSTANCES:
inline ::std::ostream &
operator << (::std::ostream &os, const sc_concatref &v)
{
    return os << v.value();
}

inline ::std::istream &
operator >> (::std::istream &is, sc_concatref &a)
{
    sc_unsigned temp(a.concat_length(0));
    temp.scan(is);
    a = temp;
    return is;
}


// ----------------------------------------------------------------------------
//  CLASS TEMPLATE : sc_concat_bool
//
//  Proxy class for read-only boolean values in concatenations.
// ----------------------------------------------------------------------------

class sc_concat_bool : public sc_value_base
{
  protected:
    static sc_core::sc_vpool<sc_concat_bool> m_pool; // Temporaries pool.
    bool m_value;                                    // Value for this obj.

  public:
    // constructor:
    sc_concat_bool() : sc_value_base(), m_value() {}

    // destructor:
    virtual ~sc_concat_bool() { }

    // allocation of temporary object:
    static inline sc_concat_bool *
    allocate(bool v)
    {
        sc_concat_bool *result_p = m_pool.allocate();
        result_p->m_value = v;
        return result_p;
    }

    // concatenation:
    virtual int
    concat_length(bool *xz_present_p) const
    {
        if (xz_present_p)
            *xz_present_p = false;
        return 1;
    }

    virtual bool
    concat_get_ctrl(sc_digit *dst_p, int low_i) const
    {
        int bit = 1 << (low_i % BITS_PER_DIGIT);
        int word_i = low_i / BITS_PER_DIGIT;
        dst_p[word_i] &= ~bit;
        return false;
    }

    virtual bool
    concat_get_data(sc_digit *dst_p, int low_i) const
    {
        int bit = 1 << (low_i % BITS_PER_DIGIT);
        int word_i = low_i / BITS_PER_DIGIT;
        if (m_value)
            dst_p[word_i] |= bit;
        else
            dst_p[word_i] &= ~bit;
        return m_value;
    }

    virtual uint64
    concat_get_uint64() const
    {
        return m_value ? 1 : 0;
    }
};


// ----------------------------------------------------------------------------
// ARITHMETIC AND LOGIC OPERATORS FOR sc_concatref
// ----------------------------------------------------------------------------

#define SC_CONCAT_OP_TYPE(RESULT, OP, OTHER_TYPE) \
    inline RESULT \
    operator OP (const sc_concatref &a, OTHER_TYPE b) \
    { \
        return a.value() OP b; \
    } \
    inline RESULT \
    operator OP (OTHER_TYPE a, const sc_concatref &b) \
    { \
        return a OP b.value(); \
    }


#define SC_CONCAT_OP(RESULT, OP) \
    inline RESULT \
    operator OP (const sc_concatref &a, const sc_concatref &b) \
    { \
        return a.value() OP b.value(); \
    }  \
    SC_CONCAT_OP_TYPE(const sc_signed, OP, int) \
    SC_CONCAT_OP_TYPE(const sc_signed, OP, long) \
    SC_CONCAT_OP_TYPE(const sc_signed, OP, int64) \
    SC_CONCAT_OP_TYPE(RESULT, OP, unsigned int) \
    SC_CONCAT_OP_TYPE(RESULT, OP, unsigned long) \
    SC_CONCAT_OP_TYPE(RESULT, OP, uint64) \
    SC_CONCAT_OP_TYPE(const sc_signed, OP, const sc_int_base &) \
    SC_CONCAT_OP_TYPE(RESULT, OP, const sc_uint_base &) \
    SC_CONCAT_OP_TYPE(const sc_signed, OP, const sc_signed &) \
    SC_CONCAT_OP_TYPE(RESULT, OP, const sc_unsigned &) \
    inline RESULT \
    operator OP (const sc_concatref &a, bool b) \
    { \
        return a.value() OP (int)b; \
    } \
    inline RESULT \
    operator OP (bool a, const sc_concatref &b) \
    { \
        return (int)a OP b.value(); \
    }

#define SC_CONCAT_BOOL_OP(OP) \
    inline bool \
    operator OP (const sc_concatref &a, const sc_concatref &b) \
    { \
        return a.value() OP b.value(); \
    }  \
    SC_CONCAT_OP_TYPE(bool, OP, int) \
    SC_CONCAT_OP_TYPE(bool, OP, long) \
    SC_CONCAT_OP_TYPE(bool, OP, int64) \
    SC_CONCAT_OP_TYPE(bool, OP, unsigned int) \
    SC_CONCAT_OP_TYPE(bool, OP, unsigned long) \
    SC_CONCAT_OP_TYPE(bool, OP, uint64) \
    SC_CONCAT_OP_TYPE(bool, OP, const sc_int_base &) \
    SC_CONCAT_OP_TYPE(bool, OP, const sc_uint_base &) \
    SC_CONCAT_OP_TYPE(bool, OP, const sc_signed &) \
    SC_CONCAT_OP_TYPE(bool, OP, const sc_unsigned &) \
    inline bool \
    operator OP (const sc_concatref &a, bool b) \
    { \
        return a.value() OP (int)b; \
    } \
    inline bool \
    operator OP (bool a, const sc_concatref &b) \
    { \
        return (int)a OP b.value(); \
    }

SC_CONCAT_OP(const sc_unsigned, +)
SC_CONCAT_OP(const sc_signed, -)
SC_CONCAT_OP(const sc_unsigned, *)
SC_CONCAT_OP(const sc_unsigned, /)
SC_CONCAT_OP(const sc_unsigned, %)
SC_CONCAT_OP(const sc_unsigned, &)
SC_CONCAT_OP(const sc_unsigned, |)
SC_CONCAT_OP(const sc_unsigned, ^)
SC_CONCAT_BOOL_OP(==)
SC_CONCAT_BOOL_OP(<=)
SC_CONCAT_BOOL_OP(>=)
SC_CONCAT_BOOL_OP(!=)
SC_CONCAT_BOOL_OP(>)
SC_CONCAT_BOOL_OP(<)

#undef SC_CONCAT_OP
#undef SC_CONCAT_OP_TYPE


// ----------------------------------------------------------------------------
// CONCATENATION FUNCTION AND OPERATOR FOR STANDARD SYSTEM C DATA TYPES:
// ----------------------------------------------------------------------------

inline sc_dt::sc_concatref &
concat(sc_dt::sc_value_base &a, sc_dt::sc_value_base &b)
{
    sc_dt::sc_concatref *result_p; // Proxy for the concatenation.

    result_p = sc_dt::sc_concatref::m_pool.allocate();
    result_p->initialize(a, b);
    return *result_p;
}

inline const sc_dt::sc_concatref &
concat(const sc_dt::sc_value_base &a, const sc_dt::sc_value_base &b)
{
    sc_dt::sc_concatref *result_p; // Proxy for the concatenation.

    result_p = sc_dt::sc_concatref::m_pool.allocate();
    result_p->initialize(a, b);
    return *result_p;
}

inline const sc_dt::sc_concatref &
concat(const sc_dt::sc_value_base &a, bool b)
{
    const sc_dt::sc_concat_bool *b_p; // Proxy for boolean value.
    sc_dt::sc_concatref *result_p; // Proxy for the concatenation.

    b_p = sc_dt::sc_concat_bool::allocate(b);
    result_p = sc_dt::sc_concatref::m_pool.allocate();
    result_p->initialize(a, *b_p);
    return *result_p;
}

inline const sc_dt::sc_concatref &
concat(bool a, const sc_dt::sc_value_base &b)
{
    const sc_dt::sc_concat_bool *a_p; // Proxy for boolean value.
    sc_dt::sc_concatref *result_p; // Proxy for the concatenation.

    a_p = sc_dt::sc_concat_bool::allocate(a);
    result_p = sc_dt::sc_concatref::m_pool.allocate();
    result_p->initialize(*a_p, b);
    return *result_p;
}

inline sc_dt::sc_concatref &
operator , (sc_dt::sc_value_base &a, sc_dt::sc_value_base &b)
{
    sc_dt::sc_concatref *result_p; // Proxy for the concatenation.

    result_p = sc_dt::sc_concatref::m_pool.allocate();
    result_p->initialize(a, b);
    return *result_p;
}

inline const sc_dt::sc_concatref &
operator , (const sc_dt::sc_value_base &a, const sc_dt::sc_value_base &b)
{
    sc_dt::sc_concatref *result_p; // Proxy for the concatenation.

    result_p = sc_dt::sc_concatref::m_pool.allocate();
    result_p->initialize(a, b);
    return *result_p;
}

inline const sc_dt::sc_concatref &
operator , (const sc_dt::sc_value_base &a, bool b)
{
    const sc_dt::sc_concat_bool *b_p; // Proxy for boolean value.
    sc_dt::sc_concatref *result_p; // Proxy for the concatenation.

    b_p = sc_dt::sc_concat_bool::allocate(b);
    result_p = sc_dt::sc_concatref::m_pool.allocate();
    result_p->initialize(a, *b_p);
    return *result_p;
}

inline const sc_dt::sc_concatref &
operator , (bool a, const sc_dt::sc_value_base &b)
{
    const sc_dt::sc_concat_bool *a_p; // Proxy for boolean value.
    sc_dt::sc_concatref *result_p; // Proxy for the concatenation.

    a_p = sc_dt::sc_concat_bool::allocate(a);
    result_p = sc_dt::sc_concatref::m_pool.allocate();
    result_p->initialize(*a_p, b);
    return *result_p;
}

} // namespace sc_dt

#endif //  __SYSTEMC_EXT_DT_MISC_SC_CONCATREF_HH__