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/*
* Copyright (c) 2001-2005 The Regents of The University of Michigan
* Copyright (c) 2010 Advanced Micro Devices, Inc.
* 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: Steve Reinhardt
* Nathan Binkert
*/
/* @file
* User Console Definitions
*/
#ifndef __SIM_OBJECT_HH__
#define __SIM_OBJECT_HH__
#include <iostream>
#include <list>
#include <map>
#include <string>
#include <vector>
#include "enums/MemoryMode.hh"
#include "params/SimObject.hh"
#include "sim/drain.hh"
#include "sim/eventq_impl.hh"
#include "sim/serialize.hh"
class BaseCPU;
class Event;
/**
* Abstract superclass for simulation objects. Represents things that
* correspond to physical components and can be specified via the
* config file (CPUs, caches, etc.).
*
* SimObject initialization is controlled by the instantiate method in
* src/python/m5/simulate.py. There are slightly different
* initialization paths when starting the simulation afresh and when
* loading from a checkpoint. After instantiation and connecting
* ports, simulate.py initializes the object using the following call
* sequence:
*
* <ol>
* <li>SimObject::init()
* <li>SimObject::regStats()
* <li><ul>
* <li>SimObject::initState() if starting afresh.
* <li>SimObject::loadState() if restoring from a checkpoint.
* </ul>
* <li>SimObject::resetStats()
* <li>SimObject::startup()
* <li>Drainable::drainResume() if resuming from a checkpoint.
* </ol>
*
* @note Whenever a method is called on all objects in the simulator's
* object tree (e.g., init(), startup(), or loadState()), a pre-order
* depth-first traversal is performed (see descendants() in
* SimObject.py). This has the effect of calling the method on the
* parent node <i>before</i> its children.
*/
class SimObject : public EventManager, public Serializable, public Drainable
{
private:
typedef std::vector<SimObject *> SimObjectList;
/** List of all instantiated simulation objects. */
static SimObjectList simObjectList;
protected:
/** Cached copy of the object parameters. */
const SimObjectParams *_params;
public:
typedef SimObjectParams Params;
const Params *params() const { return _params; }
SimObject(const Params *_params);
virtual ~SimObject() {}
public:
virtual const std::string name() const { return params()->name; }
/**
* init() is called after all C++ SimObjects have been created and
* all ports are connected. Initializations that are independent
* of unserialization but rely on a fully instantiated and
* connected SimObject graph should be done here.
*/
virtual void init();
/**
* loadState() is called on each SimObject when restoring from a
* checkpoint. The default implementation simply calls
* unserialize() if there is a corresponding section in the
* checkpoint. However, objects can override loadState() to get
* other behaviors, e.g., doing other programmed initializations
* after unserialize(), or complaining if no checkpoint section is
* found.
*
* @param cp Checkpoint to restore the state from.
*/
virtual void loadState(Checkpoint *cp);
/**
* initState() is called on each SimObject when *not* restoring
* from a checkpoint. This provides a hook for state
* initializations that are only required for a "cold start".
*/
virtual void initState();
/**
* Register statistics for this object.
*/
virtual void regStats();
/**
* Reset statistics associated with this object.
*/
virtual void resetStats();
/**
* startup() is the final initialization call before simulation.
* All state is initialized (including unserialized state, if any,
* such as the curTick() value), so this is the appropriate place to
* schedule initial event(s) for objects that need them.
*/
virtual void startup();
/**
* Provide a default implementation of the drain interface that
* simply returns 0 (draining completed) and sets the drain state
* to Drained.
*/
unsigned int drain(DrainManager *drainManger);
/**
* Serialize all SimObjects in the system.
*/
static void serializeAll(std::ostream &os);
#ifdef DEBUG
public:
bool doDebugBreak;
static void debugObjectBreak(const std::string &objs);
#endif
/**
* Find the SimObject with the given name and return a pointer to
* it. Primarily used for interactive debugging. Argument is
* char* rather than std::string to make it callable from gdb.
*/
static SimObject *find(const char *name);
};
#endif // __SIM_OBJECT_HH__
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