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

// SystemC trace 

// Copyright (C) 2008  Embecosm Limited <info@embecosm.com>

// Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

// This file is part of the cycle accurate model of the OpenRISC 1000 based

// system-on-chip, ORPSoC, built using Verilator.

// This program is free software: you can redistribute it and/or modify it

// under the terms of the GNU Lesser General Public License as published by

// the Free Software Foundation, either version 3 of the License, or (at your

// option) any later version.

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public

// License for more details.

// You should have received a copy of the GNU Lesser General Public License

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

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

// $Id: TraceSC.cpp 302 2009-02-13 17:22:07Z jeremy $

#include "TraceSC.h"

using namespace std;

SC_HAS_PROCESS( TraceSC );

//! Constructor for the trace module

//! @param name           Name of this module, passed to the parent

//!                       constructor.

//! @param _trace_target  ORPSoC module to trace

TraceSC::TraceSC (sc_core::sc_module_name  name,

                  Vorpsoc_top        *_traceTarget,

                  int argc,

                  char              *argv[]) :

  sc_module (name),

  traceTarget (_traceTarget)

{

#if VM_TRACE

  // Setup the name of the VCD dump file

  string dumpNameDefault("vlt-dump.vcd");

  string dumpSuffix("-vlt.vcd");

  string dumpDir("../results/"); // Note: hardcoded to store all VCDs in the ../results dir

  string testNameString;

  string vcdDumpFile;

  if (argc > 1) // If we were passed a name on the command line, use it

    {

      testNameString = (argv[1]);

      vcdDumpFile = dumpDir + testNameString + dumpSuffix;

    }

  else // otherwise use our default VCD dump file name

    vcdDumpFile = dumpDir + dumpNameDefault;

  Verilated::traceEverOn (true);

  cout << "Enabling VCD trace" << endl;

  printf("VCD dumpfile: %s\n", vcdDumpFile.c_str());

  // Establish a new trace with its correct time resolution, and trace to

  // great depth.

  spTraceFile = new SpTraceVcdCFile ();

  setSpTimeResolution (sc_get_time_resolution ());

  traceTarget->trace (spTraceFile, 99);

  spTraceFile->open (vcdDumpFile.c_str());

  // Method to drive the dump on each clock edge

  SC_METHOD (driveTrace);

  sensitive << clk;

#endif

}       // TraceSC ()

//! Destructor for the trace module.

//! Used to close the tracefile

TraceSC::~TraceSC ()

{

#if VM_TRACE

  spTraceFile->close ();

#endif

}       // ~TraceSC ()

//! Method to drive the trace. We're called on ever clock edge, and also at

//! initialization (to get initial values into the dump).

void

TraceSC::driveTrace()

{

#if VM_TRACE

  spTraceFile->dump (sc_time_stamp().to_double());

#endif

}       // driveTrace()

//! Utility method to set the SystemPerl trace time resolution.

//! This should be automatic, but is missed in Verilator 3.700.

//! @param t  The desired time resolution (as a SC time)

void

TraceSC::setSpTimeResolution (sc_time  t)

{

#if VM_TRACE

  double      secs = t.to_seconds();

  int         val;                      // Integral value of the precision

  const char *units;                    // Units as text

  if (secs < 1.0e-15)

    {

      cerr << "VCD time resolution " << secs << " too small: ignored" << endl;

      return;

    }

  else if (secs < 1.0e-12)

    {

      val   = secs / 1.0e-15;

      units = "f";

    }

  else if (secs < 1.0e-9)

    {

      val   = secs / 1.0e-12;

      units = "p";

    }

  else if (secs < 1.0e-6)

    {

      val   = secs / 1.0e-9;

      units = "n";

    }

  else if (secs < 1.0e-3)

    {

      val   = secs / 1.0e-6;

      units = "u";

    }

  else if (secs < 1.0)

    {

      val   = secs / 1.0e-3;

      units = "m";

    }

  else

    {

      val   = secs;

      units = "s";

    }

  // Val must be a power of 10

  switch (val)

    {

    case 1:

    case 10:

    case 100:

    case 1000:

    case 10000:

    case 100000:

    case 1000000:

    case 10000000:

    case 100000000:

    case 1000000000:

      break;                    // OK

    default:

      cerr << "VCD time resolution " << secs << " not power of 10: ignored"

           << endl;

      return;

    }

  // Set the time resolution for the trace file

  char str[32];

  sprintf (str, "%d %s", val, units);

  spTraceFile->spTrace()->set_time_resolution (str);

#endif

}       // setSpTimeResolution()