sc_vcd_trace.h

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  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
  more contributor license agreements.  See the NOTICE file distributed
  with this work for additional information regarding copyright ownership.
  Accellera licenses this file to you under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with the
  License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
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  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
  implied.  See the License for the specific language governing
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/*****************************************************************************

  sc_vcd_trace.h - Implementation of VCD tracing.

  Original Author - Abhijit Ghosh, Synopsys, Inc.

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

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

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

      Name, Affiliation, Date:
  Description of Modification:

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

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

   Acknowledgement: The tracing mechanism is based on the tracing
   mechanism developed at Infineon (formerly Siemens HL). Though this
   code is somewhat different, and significantly enhanced, the basics
   are identical to what was originally contributed by Infineon.  The
   contribution of Infineon in the development of this tracing
   technology is hereby acknowledged.

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

#ifndef SC_VCD_TRACE_H
#define SC_VCD_TRACE_H

#include "sysc/tracing/sc_trace_file_base.h"

namespace sc_core {

class sc_time;

class vcd_trace;  // defined in sc_vcd_trace.cpp
template<class T> class vcd_T_trace;


class vcd_trace_file
  : public sc_trace_file_base
{
public:

    enum vcd_enum {VCD_WIRE=0, VCD_REAL, VCD_EVENT, VCD_TIME, VCD_LAST};

        // sc_set_vcd_time_unit is deprecated.
#if 0 // deprecated
    inline void sc_set_vcd_time_unit(int exponent10_seconds)
        { set_time_unit(exponent10_seconds); }
#endif

    // Create a Vcd trace file.
    // `Name' forms the base of the name to which `.vcd' is added.
    vcd_trace_file(const char *name);

    // Flush results and close file.
    ~vcd_trace_file();

protected:

    // These are all virtual functions in sc_trace_file and
    // they need to be defined here.

    // Trace sc_time, sc_event
    virtual void trace(const sc_time& object, const std::string& name);
    virtual void trace(const sc_event& object, const std::string& name);

    // Trace a boolean object (single bit)
     void trace(const bool& object, const std::string& name);

    // Trace a sc_bit object (single bit)
    virtual void trace( const sc_dt::sc_bit& object,
            const std::string& name);

    // Trace a sc_logic object (single bit)
     void trace(const sc_dt::sc_logic& object, const std::string& name);

    // Trace an unsigned char with the given width
     void trace(const unsigned char& object, const std::string& name,
        int width);

    // Trace an unsigned short with the given width
     void trace(const unsigned short& object, const std::string& name,
        int width);

    // Trace an unsigned int with the given width
     void trace(const unsigned int& object, const std::string& name,
        int width);

    // Trace an unsigned long with the given width
     void trace(const unsigned long& object, const std::string& name,
        int width);

    // Trace a signed char with the given width
     void trace(const char& object, const std::string& name, int width);

    // Trace a signed short with the given width
     void trace(const short& object, const std::string& name, int width);

    // Trace a signed int with the given width
     void trace(const int& object, const std::string& name, int width);

    // Trace a signed long with the given width
     void trace(const long& object, const std::string& name, int width);

    // Trace an int64 with a given width
     void trace(const sc_dt::int64& object, const std::string& name,
         int width);

    // Trace a uint64 with a given width
     void trace(const sc_dt::uint64& object, const std::string& name,
         int width);

    // Trace a float
     void trace(const float& object, const std::string& name);

    // Trace a double
     void trace(const double& object, const std::string& name);

    // Trace sc_dt::sc_uint_base
     void trace (const sc_dt::sc_uint_base& object,
                const std::string& name);

    // Trace sc_dt::sc_int_base
     void trace (const sc_dt::sc_int_base& object,
                const std::string& name);

    // Trace sc_dt::sc_unsigned
     void trace (const sc_dt::sc_unsigned& object,
                const std::string& name);

    // Trace sc_dt::sc_signed
     void trace (const sc_dt::sc_signed& object, const std::string& name);

    // Trace sc_dt::sc_fxval
    void trace( const sc_dt::sc_fxval& object, const std::string& name );

    // Trace sc_dt::sc_fxval_fast
    void trace( const sc_dt::sc_fxval_fast& object,
                const std::string& name );

    // Trace sc_dt::sc_fxnum
    void trace( const sc_dt::sc_fxnum& object, const std::string& name );

    // Trace sc_dt::sc_fxnum_fast
    void trace( const sc_dt::sc_fxnum_fast& object,
                const std::string& name );

    template<class T>
    void traceT(const T& object, const std::string& name,
        vcd_enum type=VCD_WIRE)
    {
        if( add_trace_check(name) )
            traces.push_back(new vcd_T_trace<T>( object, name
                                               , obtain_name(),type) );
    }

   // Trace sc_dt::sc_bv_base (sc_dt::sc_bv)
    virtual void trace(const sc_dt::sc_bv_base& object,
                const std::string& name);

    // Trace sc_dt::sc_lv_base (sc_dt::sc_lv)
    virtual void trace(const sc_dt::sc_lv_base& object,
            const std::string& name);

    // Trace an enumerated object - where possible output the enumeration literals
    // in the trace file. Enum literals is a null terminated array of null
    // terminated char* literal strings.
     void trace(const unsigned& object, const std::string& name,
        const char** enum_literals);

    // Output a comment to the trace file
     void write_comment(const std::string& comment);

    // Write trace info for cycle.
     void cycle(bool delta_cycle);

private:

    template<typename T> const T& extract_ref(const T& object) const
      { return object; }
    const sc_dt::uint64& extract_ref(const sc_event& object) const
      { return event_trigger_stamp(object); }

#if SC_TRACING_PHASE_CALLBACKS_
    // avoid hidden overload warnings
    virtual void trace( sc_trace_file* ) const;
#endif // SC_TRACING_PHASE_CALLBACKS_

    // Initialize the VCD tracing
    virtual void do_initialize();
    void print_time_stamp(unit_type now_units_high, unit_type now_units_low) const;
    bool get_time_stamp(unit_type &now_units_high, unit_type &now_units_low) const;

    unsigned vcd_name_index;           // Number of variables traced

    unit_type previous_time_units_low;
    unit_type previous_time_units_high;

public:

    // Array to store the variables traced
    std::vector<vcd_trace*> traces;

    // Create VCD names for each variable
    std::string obtain_name();

};

} // namespace sc_core

#endif // SC_VCD_TRACE_H
// Taf!