/*
 * Copyright (c) 2004-2005 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Nathan Binkert
 */

// This file will contain default statistics for the simulator that
// don't really belong to a specific simulator object

#include <fstream>
#include <iostream>
#include <list>

#include "base/callback.hh"
#include "base/hostinfo.hh"
#include "base/statistics.hh"
#include "base/time.hh"

#include "config/the_isa.hh"
#if THE_ISA == NO_ISA
#include "arch/noisa/cpu_dummy.hh"
#else
#include "cpu/base.hh"
#endif

#include "sim/eventq.hh"
#include "sim/stat_control.hh"

using namespace std;

Stats::Formula simSeconds;
Stats::Value simTicks;
Stats::Value simFreq;

namespace Stats {

Time statTime(true);
Tick startTick;

struct SimTicksReset : public Callback
{
    void process()
    {
        statTime.set();
        startTick = curTick();
    }
};

double
statElapsedTime()
{
    Time now(true);
    Time elapsed = now - statTime;
    return elapsed();
}

Tick
statElapsedTicks()
{
    return curTick() - startTick;
}

SimTicksReset simTicksReset;

struct Global
{
    Stats::Formula hostInstRate;
    Stats::Formula hostTickRate;
    Stats::Value hostMemory;
    Stats::Value hostSeconds;

    Stats::Value simInsts;

    Global();
};

Global::Global()
{
    simInsts
        .functor(BaseCPU::numSimulatedInstructions)
        .name("sim_insts")
        .desc("Number of instructions simulated")
        .precision(0)
        .prereq(simInsts)
        ;

    simSeconds
        .name("sim_seconds")
        .desc("Number of seconds simulated")
        ;

    simFreq
        .scalar(SimClock::Frequency)
        .name("sim_freq")
        .desc("Frequency of simulated ticks")
        ;

    simTicks
        .functor(statElapsedTicks)
        .name("sim_ticks")
        .desc("Number of ticks simulated")
        ;

    hostInstRate
        .name("host_inst_rate")
        .desc("Simulator instruction rate (inst/s)")
        .precision(0)
        .prereq(simInsts)
        ;

    hostMemory
        .functor(memUsage)
        .name("host_mem_usage")
        .desc("Number of bytes of host memory used")
        .prereq(hostMemory)
        ;

    hostSeconds
        .functor(statElapsedTime)
        .name("host_seconds")
        .desc("Real time elapsed on the host")
        .precision(2)
        ;

    hostTickRate
        .name("host_tick_rate")
        .desc("Simulator tick rate (ticks/s)")
        .precision(0)
        ;

    simSeconds = simTicks / simFreq;
    hostInstRate = simInsts / hostSeconds;
    hostTickRate = simTicks / hostSeconds;

    registerResetCallback(&simTicksReset);
}

void
initSimStats()
{
    static Global global;
}

class StatEvent : public Event
{
  private:
    bool dump;
    bool reset;
    Tick repeat;

  public:
    StatEvent(bool _dump, bool _reset, Tick _repeat)
        : Event(Stat_Event_Pri), dump(_dump), reset(_reset), repeat(_repeat)
    {
        setFlags(AutoDelete);
    }

    virtual void
    process()
    {
        if (dump)
            Stats::dump();

        if (reset)
            Stats::reset();

        if (repeat) {
            Stats::schedStatEvent(dump, reset, curTick() + repeat, repeat);
        }
    }
};

void
schedStatEvent(bool dump, bool reset, Tick when, Tick repeat)
{
    Event *event = new StatEvent(dump, reset, repeat);
    mainEventQueue.schedule(event, when);
}

} // namespace Stats