probe.hh

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/*
 * Copyright (c) 2013 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * 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
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 * 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
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Matt Horsnell
  */

#ifndef __SIM_PROBE_PROBE_HH__
#define __SIM_PROBE_PROBE_HH__

#include <string>
#include <vector>

#include "base/compiler.hh"
#include "base/trace.hh"
#include "sim/sim_object.hh"

class ProbeManager;
class ProbeListener;
class ProbeListenerObjectParams;

namespace ProbePoints {
/* Note: This is only here for documentation purposes, new probe
 * points should normally be declared in their own header files. See
 * for example pmu.hh.
 */
}

class ProbeListenerObject : public SimObject
{
  protected:
    ProbeManager *manager;
    std::vector<ProbeListener *> listeners;

  public:
    ProbeListenerObject(const ProbeListenerObjectParams *params);
    virtual ~ProbeListenerObject();
    ProbeManager* getProbeManager() { return manager; }
};

class ProbeListener
{
  public:
    ProbeListener(ProbeManager *manager, const std::string &name);
    virtual ~ProbeListener();

  protected:
    ProbeManager *const manager;
    const std::string name;
};

class ProbePoint
{
  protected:
    const std::string name;
  public:
    ProbePoint(ProbeManager *manager, const std::string &name);
    virtual ~ProbePoint() {}

    virtual void addListener(ProbeListener *listener) = 0;
    virtual void removeListener(ProbeListener *listener) = 0;
    std::string getName() const { return name; }
};

class ProbeManager
{
  private:
    const M5_CLASS_VAR_USED SimObject *object;
    std::vector<ProbePoint *> points;

  public:
    ProbeManager(SimObject *obj)
        : object(obj)
    {}
    virtual ~ProbeManager() {}

    bool addListener(std::string pointName, ProbeListener &listener);

    bool removeListener(std::string pointName, ProbeListener &listener);

    void addPoint(ProbePoint &point);
};

template <class Arg>
class ProbeListenerArgBase : public ProbeListener
{
  public:
    ProbeListenerArgBase(ProbeManager *pm, const std::string &name)
        : ProbeListener(pm, name)
    {}
    virtual void notify(const Arg &val) = 0;
};

template <class T, class Arg>
class ProbeListenerArg : public ProbeListenerArgBase<Arg>
{
  private:
    T *object;
    void (T::* function)(const Arg &);

  public:
    ProbeListenerArg(T *obj, const std::string &name, void (T::* func)(const Arg &))
        : ProbeListenerArgBase<Arg>(obj->getProbeManager(), name),
          object(obj),
          function(func)
    {}

    virtual void notify(const Arg &val) { (object->*function)(val); }
};

template <typename Arg>
class ProbePointArg : public ProbePoint
{
    std::vector<ProbeListenerArgBase<Arg> *> listeners;

  public:
    ProbePointArg(ProbeManager *manager, std::string name)
        : ProbePoint(manager, name)
    {
    }

    void addListener(ProbeListener *l)
    {
        // check listener not already added
        if (std::find(listeners.begin(), listeners.end(), l) == listeners.end()) {
            listeners.push_back(static_cast<ProbeListenerArgBase<Arg> *>(l));
        }
    }

    void removeListener(ProbeListener *l)
    {
        listeners.erase(std::remove(listeners.begin(), listeners.end(), l),
                        listeners.end());
    }

    void notify(const Arg &arg)
    {
        for (auto l = listeners.begin(); l != listeners.end(); ++l) {
            (*l)->notify(arg);
        }
    }
};
#endif//__SIM_PROBE_PROBE_HH__