dt/fx/sc_fxdefs.hh

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

  sc_fxdefs.h -

  Original Author: Martin Janssen, Synopsys, Inc.

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

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  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
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// $Log: sc_fxdefs.h,v $
// Revision 1.1.1.1  2006/12/15 20:20:04  acg
// SystemC 2.3
//
// Revision 1.3  2006/01/13 18:53:57  acg
// Andy Goodrich: added $Log command so that CVS comments are reproduced in
// the source.
//

#ifndef __SYSTEMC_EXT_DT_FX_SC_FXDEFS_HH__
#define __SYSTEMC_EXT_DT_FX_SC_FXDEFS_HH__

#include "../../utils/sc_report_handler.hh"
#include "../int/sc_nbutils.hh"

namespace sc_dt
{

// ----------------------------------------------------------------------------
//  ENUM : sc_enc
//
//  Enumeration of sign encodings.
// ----------------------------------------------------------------------------

enum sc_enc
{
    SC_TC_, // two's complement
    SC_US_ // unsigned
};

const std::string to_string(sc_enc);

inline ::std::ostream &
operator << (::std::ostream &os, sc_enc enc)
{
    return os << to_string(enc);
}


// ----------------------------------------------------------------------------
//  ENUM : sc_q_mode
//
//  Enumeration of quantization modes.
// ----------------------------------------------------------------------------

enum sc_q_mode
{
    SC_RND, // rounding to plus infinity
    SC_RND_ZERO, // rounding to zero
    SC_RND_MIN_INF, // rounding to minus infinity
    SC_RND_INF, // rounding to infinity
    SC_RND_CONV, // convergent rounding
    SC_TRN, // truncation
    SC_TRN_ZERO // truncation to zero
};

const std::string to_string(sc_q_mode);

inline ::std::ostream &
operator << (::std::ostream &os, sc_q_mode q_mode)
{
    return os << to_string(q_mode);
}


// ----------------------------------------------------------------------------
//  ENUM : sc_o_mode
//
//  Enumeration of overflow modes.
// ----------------------------------------------------------------------------

enum sc_o_mode
{
    SC_SAT, // saturation
    SC_SAT_ZERO, // saturation to zero
    SC_SAT_SYM, // symmetrical saturation
    SC_WRAP, // wrap-around (*)
    SC_WRAP_SM // sign magnitude wrap-around (*)
};

// (*) uses the number of saturated bits argument, see the documentation.

const std::string to_string( sc_o_mode );

inline ::std::ostream &
operator << (::std::ostream &os, sc_o_mode o_mode)
{
    return os << to_string(o_mode);
}


// ----------------------------------------------------------------------------
//  ENUM : sc_switch
//
//  Enumeration of switch states.
// ----------------------------------------------------------------------------

enum sc_switch
{
    SC_OFF,
    SC_ON
};

const std::string to_string(sc_switch);

inline ::std::ostream &
operator << (::std::ostream &os, sc_switch sw)
{
    return os << to_string(sw);
}


// ----------------------------------------------------------------------------
//  ENUM : sc_fmt
//
//  Enumeration of formats for character string conversion.
// ----------------------------------------------------------------------------

enum sc_fmt
{
    SC_F, // fixed
    SC_E // scientific
};

const std::string to_string(sc_fmt);

inline ::std::ostream &
operator << (::std::ostream &os, sc_fmt fmt)
{
    return os << to_string(fmt);
}


// ----------------------------------------------------------------------------
//  Built-in & default fixed-point type parameter values.
// ----------------------------------------------------------------------------

const int SC_BUILTIN_WL_ = 32;
const int SC_BUILTIN_IWL_ = 32;
const sc_q_mode SC_BUILTIN_Q_MODE_ = SC_TRN;
const sc_o_mode SC_BUILTIN_O_MODE_ = SC_WRAP;
const int SC_BUILTIN_N_BITS_ = 0;

const int SC_DEFAULT_WL_ = SC_BUILTIN_WL_;
const int SC_DEFAULT_IWL_ = SC_BUILTIN_IWL_;
const sc_q_mode SC_DEFAULT_Q_MODE_ = SC_BUILTIN_Q_MODE_;
const sc_o_mode SC_DEFAULT_O_MODE_ = SC_BUILTIN_O_MODE_;
const int SC_DEFAULT_N_BITS_ = SC_BUILTIN_N_BITS_;


// ----------------------------------------------------------------------------
//  Built-in & default fixed-point cast switch parameter values.
// ----------------------------------------------------------------------------

const sc_switch SC_BUILTIN_CAST_SWITCH_ = SC_ON;
const sc_switch SC_DEFAULT_CAST_SWITCH_ = SC_BUILTIN_CAST_SWITCH_;


// ----------------------------------------------------------------------------
//  Built-in & default fixed-point value type parameter values.
// ----------------------------------------------------------------------------

const int SC_BUILTIN_DIV_WL_ = 64;
const int SC_BUILTIN_CTE_WL_ = 64;
const int SC_BUILTIN_MAX_WL_ = 1024;


#if defined(SC_FXDIV_WL) && (SC_FXDIV_WL > 0)
const int SC_DEFAULT_DIV_WL_ = SC_FXDIV_WL;
#else
const int SC_DEFAULT_DIV_WL_ = SC_BUILTIN_DIV_WL_;
#endif

#if defined(SC_FXCTE_WL) && (SC_FXCTE_WL > 0)
const int SC_DEFAULT_CTE_WL_ = SC_FXCTE_WL;
#else
const int SC_DEFAULT_CTE_WL_ = SC_BUILTIN_CTE_WL_;
#endif

#if defined(SC_FXMAX_WL) && (SC_FXMAX_WL > 0 || SC_FXMAX_WL == -1)
const int SC_DEFAULT_MAX_WL_ = SC_FXMAX_WL;
#else
const int SC_DEFAULT_MAX_WL_ = SC_BUILTIN_MAX_WL_;
#endif


// ----------------------------------------------------------------------------
//  Dedicated error reporting and checking.
// ----------------------------------------------------------------------------

#define SC_ERROR_IF_IMPL_(cnd, id, msg) \
    do { \
        if (cnd) { \
            SC_REPORT_ERROR(id, msg); \
            sc_core::sc_abort(); /* can't recover from here */ \
        } \
    } while ( false )

#ifdef DEBUG_SYSTEMC
#   define SC_ASSERT_(cnd, msg) \
    SC_ERROR_IF_IMPL_(!(cnd), "internal error", msg)
#else
#   define SC_ASSERT_(cnd, msg) (void(0))
#endif

#define SC_ERROR_IF_(cnd,id) SC_ERROR_IF_IMPL_(cnd, id, 0)

#define SC_CHECK_WL_(wl) SC_ERROR_IF_((wl) <= 0, \
        "total wordlength <= 0 is not valid")

#define SC_CHECK_N_BITS_(n_bits) \
    SC_ERROR_IF_((n_bits) < 0, "number of bits < 0 is not valid")

#define SC_CHECK_DIV_WL_(div_wl) \
    SC_ERROR_IF_((div_wl) <= 0, "division wordlength <= 0 is not valid")

#define SC_CHECK_CTE_WL_(cte_wl) \
    SC_ERROR_IF_((cte_wl) <= 0, "constant wordlength <= 0 is not valid")

#define SC_CHECK_MAX_WL_(max_wl) \
    SC_ERROR_IF_((max_wl) <= 0 && (max_wl) != -1, \
            "maximum wordlength <= 0 and != -1 is not valid")


// ----------------------------------------------------------------------------
//  Generic observer macros.
// ----------------------------------------------------------------------------

#define SC_OBSERVER_(object, observer_type, event) \
{ \
    if ((object).observer() != 0) { \
        observer_type observer = (object).lock_observer(); \
        observer->event((object)); \
        (object).unlock_observer(observer); \
    } \
}

#define SC_OBSERVER_DEFAULT_(observer_type) \
{ \
    if (m_observer == 0 && observer_type::default_observer != 0) \
        m_observer = (*observer_type::default_observer)(); \
}

} // namespace sc_dt

#endif // __SYSTEMC_EXT_DT_FX_SC_FXDEFS_HH__