src/sim/serialize.cc - amd/gem5 - Git at Google

 /*
  * Copyright (c) 2002-2005 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: Erik Hallnor
  *          Steve Reinhardt
  */

 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>

 #include <fstream>
 #include <list>
 #include <string>
 #include <vector>

 #include "base/inifile.hh"
 #include "base/misc.hh"
 #include "base/output.hh"
 #include "base/str.hh"
 #include "base/trace.hh"
 #include "sim/config_node.hh"
 #include "sim/eventq.hh"
 #include "sim/param.hh"
 #include "sim/serialize.hh"
 #include "sim/sim_events.hh"
 #include "sim/sim_exit.hh"
 #include "sim/sim_object.hh"

 using namespace std;

 int Serializable::ckptMaxCount = 0;
 int Serializable::ckptCount = 0;
 int Serializable::ckptPrevCount = -1;

 void
 Serializable::nameOut(ostream &os)
 {
     os << "\n[" << name() << "]\n";
 }

 void
 Serializable::nameOut(ostream &os, const string &_name)
 {
     os << "\n[" << _name << "]\n";
 }

 template <class T>
 void
 paramOut(ostream &os, const std::string &name, const T &param)
 {
     os << name << "=";
     showParam(os, param);
     os << "\n";
 }


 template <class T>
 void
 paramIn(Checkpoint *cp, const std::string &section,
         const std::string &name, T &param)
 {
     std::string str;
     if (!cp->find(section, name, str) || !parseParam(str, param)) {
         fatal("Can't unserialize '%s:%s'\n", section, name);
     }
 }


 template <class T>
 void
 arrayParamOut(ostream &os, const std::string &name,
               const T *param, int size)
 {
     os << name << "=";
     if (size > 0)
         showParam(os, param[0]);
     for (int i = 1; i < size; ++i) {
         os << " ";
         showParam(os, param[i]);
     }
     os << "\n";
 }


 template <class T>
 void
 arrayParamIn(Checkpoint *cp, const std::string &section,
              const std::string &name, T *param, int size)
 {
     std::string str;
     if (!cp->find(section, name, str)) {
         fatal("Can't unserialize '%s:%s'\n", section, name);
     }

     // code below stolen from VectorParam<T>::parse().
     // it would be nice to unify these somehow...

     vector<string> tokens;

     tokenize(tokens, str, ' ');

     // Need this if we were doing a vector
     // value.resize(tokens.size());

     if (tokens.size() != size) {
         fatal("Array size mismatch on %s:%s'\n", section, name);
     }

     for (int i = 0; i < tokens.size(); i++) {
         // need to parse into local variable to handle vector<bool>,
         // for which operator[] returns a special reference class
         // that's not the same as 'bool&', (since it's a packed
         // vector)
         T scalar_value;
         if (!parseParam(tokens[i], scalar_value)) {
             string err("could not parse \"");

             err += str;
             err += "\"";

             fatal(err);
         }

         // assign parsed value to vector
         param[i] = scalar_value;
     }
 }


 void
 objParamIn(Checkpoint *cp, const std::string &section,
            const std::string &name, Serializable * &param)
 {
     if (!cp->findObj(section, name, param)) {
         fatal("Can't unserialize '%s:%s'\n", section, name);
     }
 }


 #define INSTANTIATE_PARAM_TEMPLATES(type)				\
 template void								\
 paramOut(ostream &os, const std::string &name, type const &param);	\
 template void								\
 paramIn(Checkpoint *cp, const std::string &section,			\
         const std::string &name, type & param);				\
 template void								\
 arrayParamOut(ostream &os, const std::string &name,			\
               type const *param, int size);				\
 template void								\
 arrayParamIn(Checkpoint *cp, const std::string &section,		\
              const std::string &name, type *param, int size);

 INSTANTIATE_PARAM_TEMPLATES(signed char)
 INSTANTIATE_PARAM_TEMPLATES(unsigned char)
 INSTANTIATE_PARAM_TEMPLATES(signed short)
 INSTANTIATE_PARAM_TEMPLATES(unsigned short)
 INSTANTIATE_PARAM_TEMPLATES(signed int)
 INSTANTIATE_PARAM_TEMPLATES(unsigned int)
 INSTANTIATE_PARAM_TEMPLATES(signed long)
 INSTANTIATE_PARAM_TEMPLATES(unsigned long)
 INSTANTIATE_PARAM_TEMPLATES(signed long long)
 INSTANTIATE_PARAM_TEMPLATES(unsigned long long)
 INSTANTIATE_PARAM_TEMPLATES(bool)
 INSTANTIATE_PARAM_TEMPLATES(string)


 /////////////////////////////

 /// Container for serializing global variables (not associated with
 /// any serialized object).
 class Globals : public Serializable
 {
   public:
     const string name() const;
     void serialize(ostream &os);
     void unserialize(Checkpoint *cp);
 };

 /// The one and only instance of the Globals class.
 Globals globals;

 const string
 Globals::name() const
 {
     return "Globals";
 }

 void
 Globals::serialize(ostream &os)
 {
     nameOut(os);
     SERIALIZE_SCALAR(curTick);

     nameOut(os, "MainEventQueue");
     mainEventQueue.serialize(os);
 }

 void
 Globals::unserialize(Checkpoint *cp)
 {
     const string &section = name();
     UNSERIALIZE_SCALAR(curTick);

     mainEventQueue.unserialize(cp, "MainEventQueue");
 }

 void
 Serializable::serializeAll()
 {
     string dir = Checkpoint::dir();
     if (mkdir(dir.c_str(), 0775) == -1 && errno != EEXIST)
             fatal("couldn't mkdir %s\n", dir);

     string cpt_file = dir + Checkpoint::baseFilename;
     ofstream outstream(cpt_file.c_str());
     time_t t = time(NULL);
     outstream << "// checkpoint generated: " << ctime(&t);

     globals.serialize(outstream);
     SimObject::serializeAll(outstream);

     assert(Serializable::ckptPrevCount + 1 == Serializable::ckptCount);
     Serializable::ckptPrevCount++;
     if (ckptMaxCount && ++ckptCount >= ckptMaxCount)
         exitSimLoop(curTick + 1, "Maximum number of checkpoints dropped");

 }


 void
 Serializable::unserializeGlobals(Checkpoint *cp)
 {
     globals.unserialize(cp);
 }


 class SerializeEvent : public Event
 {
   protected:
     Tick repeat;

   public:
     SerializeEvent(Tick _when, Tick _repeat);
     virtual void process();
     virtual void serialize(std::ostream &os)
     {
         panic("Cannot serialize the SerializeEvent");
     }

 };

 SerializeEvent::SerializeEvent(Tick _when, Tick _repeat)
     : Event(&mainEventQueue, Serialize_Pri), repeat(_repeat)
 {
     setFlags(AutoDelete);
     schedule(_when);
 }

 void
 SerializeEvent::process()
 {
     Serializable::serializeAll();
     if (repeat)
         schedule(curTick + repeat);
 }

 const char *Checkpoint::baseFilename = "m5.cpt";

 static string checkpointDirBase;

 string
 Checkpoint::dir()
 {
     // use csprintf to insert curTick into directory name if it
     // appears to have a format placeholder in it.
     return (checkpointDirBase.find("%") != string::npos) ?
         csprintf(checkpointDirBase, curTick) : checkpointDirBase;
 }

 void
 Checkpoint::setup(Tick when, Tick period)
 {
     new SerializeEvent(when, period);
 }

 class SerializeParamContext : public ParamContext
 {
   private:
     SerializeEvent *event;

   public:
     SerializeParamContext(const string &section);
     ~SerializeParamContext();
     void checkParams();
 };

 SerializeParamContext serialParams("serialize");

 Param<string> serialize_dir(&serialParams, "dir",
                             "dir to stick checkpoint in "
                             "(sprintf format with cycle #)");

 Param<Counter> serialize_cycle(&serialParams,
                                 "cycle",
                                 "cycle to serialize",
                                 0);

 Param<Counter> serialize_period(&serialParams,
                                 "period",
                                 "period to repeat serializations",
                                 0);

 Param<int> serialize_count(&serialParams, "count",
                            "maximum number of checkpoints to drop");

 SerializeParamContext::SerializeParamContext(const string &section)
     : ParamContext(section), event(NULL)
 { }

 SerializeParamContext::~SerializeParamContext()
 {
 }

 void
 SerializeParamContext::checkParams()
 {
     checkpointDirBase = simout.resolve(serialize_dir);

     // guarantee that directory ends with a '/'
     if (checkpointDirBase[checkpointDirBase.size() - 1] != '/')
         checkpointDirBase += "/";

     if (serialize_cycle > 0)
         Checkpoint::setup(serialize_cycle, serialize_period);

     Serializable::ckptMaxCount = serialize_count;
 }

 void
 debug_serialize()
 {
     Serializable::serializeAll();
 }

 void
 debug_serialize(Tick when)
 {
     new SerializeEvent(when, 0);
 }

 ////////////////////////////////////////////////////////////////////////
 //
 // SerializableClass member definitions
 //
 ////////////////////////////////////////////////////////////////////////

 // Map of class names to SerializableBuilder creation functions.
 // Need to make this a pointer so we can force initialization on the
 // first reference; otherwise, some SerializableClass constructors
 // may be invoked before the classMap constructor.
 map<string,SerializableClass::CreateFunc> *SerializableClass::classMap = 0;

 // SerializableClass constructor: add mapping to classMap
 SerializableClass::SerializableClass(const string &className,
                                        CreateFunc createFunc)
 {
     if (classMap == NULL)
         classMap = new map<string,SerializableClass::CreateFunc>();

     if ((*classMap)[className])
     {
         cerr << "Error: simulation object class " << className << " redefined"
              << endl;
         fatal("");
     }

     // add className --> createFunc to class map
     (*classMap)[className] = createFunc;
 }


 //
 //
 Serializable *
 SerializableClass::createObject(Checkpoint *cp,
                                  const std::string &section)
 {
     string className;

     if (!cp->find(section, "type", className)) {
         fatal("Serializable::create: no 'type' entry in section '%s'.\n",
               section);
     }

     CreateFunc createFunc = (*classMap)[className];

     if (createFunc == NULL) {
         fatal("Serializable::create: no create function for class '%s'.\n",
               className);
     }

     Serializable *object = createFunc(cp, section);

     assert(object != NULL);

     return object;
 }


 Serializable *
 Serializable::create(Checkpoint *cp, const std::string &section)
 {
     Serializable *object = SerializableClass::createObject(cp, section);
     object->unserialize(cp, section);
     return object;
 }


 Checkpoint::Checkpoint(const std::string &cpt_dir, const std::string &path,
                        const ConfigNode *_configNode)
     : db(new IniFile), basePath(path), configNode(_configNode), cptDir(cpt_dir)
 {
     string filename = cpt_dir + "/" + Checkpoint::baseFilename;
     if (!db->load(filename)) {
         fatal("Can't load checkpoint file '%s'\n", filename);
     }
 }


 bool
 Checkpoint::find(const std::string &section, const std::string &entry,
                  std::string &value)
 {
     return db->find(section, entry, value);
 }


 bool
 Checkpoint::findObj(const std::string &section, const std::string &entry,
                     Serializable *&value)
 {
     string path;

     if (!db->find(section, entry, path))
         return false;

     if ((value = configNode->resolveSimObject(path)) != NULL)
         return true;

     if ((value = objMap[path]) != NULL)
         return true;

     return false;
 }


 bool
 Checkpoint::sectionExists(const std::string &section)
 {
     return db->sectionExists(section);
 }
	/*
	* Copyright (c) 2002-2005 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: Erik Hallnor
	* Steve Reinhardt
	*/

	#include <sys/time.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <errno.h>

	#include <fstream>
	#include <list>
	#include <string>
	#include <vector>

	#include "base/inifile.hh"
	#include "base/misc.hh"
	#include "base/output.hh"
	#include "base/str.hh"
	#include "base/trace.hh"
	#include "sim/config_node.hh"
	#include "sim/eventq.hh"
	#include "sim/param.hh"
	#include "sim/serialize.hh"
	#include "sim/sim_events.hh"
	#include "sim/sim_exit.hh"
	#include "sim/sim_object.hh"

	using namespace std;

	int Serializable::ckptMaxCount = 0;
	int Serializable::ckptCount = 0;
	int Serializable::ckptPrevCount = -1;

	void
	Serializable::nameOut(ostream &os)
	{
	os << "\n[" << name() << "]\n";
	}

	void
	Serializable::nameOut(ostream &os, const string &_name)
	{
	os << "\n[" << _name << "]\n";
	}

	template <class T>
	void
	paramOut(ostream &os, const std::string &name, const T &param)
	{
	os << name << "=";
	showParam(os, param);
	os << "\n";
	}


	template <class T>
	void
	paramIn(Checkpoint *cp, const std::string &section,
	const std::string &name, T &param)
	{
	std::string str;
	if (!cp->find(section, name, str) \|\| !parseParam(str, param)) {
	fatal("Can't unserialize '%s:%s'\n", section, name);
	}
	}


	template <class T>
	void
	arrayParamOut(ostream &os, const std::string &name,
	const T *param, int size)
	{
	os << name << "=";
	if (size > 0)
	showParam(os, param[0]);
	for (int i = 1; i < size; ++i) {
	os << " ";
	showParam(os, param[i]);
	}
	os << "\n";
	}


	template <class T>
	void
	arrayParamIn(Checkpoint *cp, const std::string &section,
	const std::string &name, T *param, int size)
	{
	std::string str;
	if (!cp->find(section, name, str)) {
	fatal("Can't unserialize '%s:%s'\n", section, name);
	}

	// code below stolen from VectorParam<T>::parse().
	// it would be nice to unify these somehow...

	vector<string> tokens;

	tokenize(tokens, str, ' ');

	// Need this if we were doing a vector
	// value.resize(tokens.size());

	if (tokens.size() != size) {
	fatal("Array size mismatch on %s:%s'\n", section, name);
	}

	for (int i = 0; i < tokens.size(); i++) {
	// need to parse into local variable to handle vector<bool>,
	// for which operator[] returns a special reference class
	// that's not the same as 'bool&', (since it's a packed
	// vector)
	T scalar_value;
	if (!parseParam(tokens[i], scalar_value)) {
	string err("could not parse \"");

	err += str;
	err += "\"";

	fatal(err);
	}

	// assign parsed value to vector
	param[i] = scalar_value;
	}
	}


	void
	objParamIn(Checkpoint *cp, const std::string &section,
	const std::string &name, Serializable * &param)
	{
	if (!cp->findObj(section, name, param)) {
	fatal("Can't unserialize '%s:%s'\n", section, name);
	}
	}


	#define INSTANTIATE_PARAM_TEMPLATES(type) \
	template void \
	paramOut(ostream &os, const std::string &name, type const &param); \
	template void \
	paramIn(Checkpoint *cp, const std::string &section, \
	const std::string &name, type & param); \
	template void \
	arrayParamOut(ostream &os, const std::string &name, \
	type const *param, int size); \
	template void \
	arrayParamIn(Checkpoint *cp, const std::string &section, \
	const std::string &name, type *param, int size);

	INSTANTIATE_PARAM_TEMPLATES(signed char)
	INSTANTIATE_PARAM_TEMPLATES(unsigned char)
	INSTANTIATE_PARAM_TEMPLATES(signed short)
	INSTANTIATE_PARAM_TEMPLATES(unsigned short)
	INSTANTIATE_PARAM_TEMPLATES(signed int)
	INSTANTIATE_PARAM_TEMPLATES(unsigned int)
	INSTANTIATE_PARAM_TEMPLATES(signed long)
	INSTANTIATE_PARAM_TEMPLATES(unsigned long)
	INSTANTIATE_PARAM_TEMPLATES(signed long long)
	INSTANTIATE_PARAM_TEMPLATES(unsigned long long)
	INSTANTIATE_PARAM_TEMPLATES(bool)
	INSTANTIATE_PARAM_TEMPLATES(string)


	/////////////////////////////

	/// Container for serializing global variables (not associated with
	/// any serialized object).
	class Globals : public Serializable
	{
	public:
	const string name() const;
	void serialize(ostream &os);
	void unserialize(Checkpoint *cp);
	};

	/// The one and only instance of the Globals class.
	Globals globals;

	const string
	Globals::name() const
	{
	return "Globals";
	}

	void
	Globals::serialize(ostream &os)
	{
	nameOut(os);
	SERIALIZE_SCALAR(curTick);

	nameOut(os, "MainEventQueue");
	mainEventQueue.serialize(os);
	}

	void
	Globals::unserialize(Checkpoint *cp)
	{
	const string &section = name();
	UNSERIALIZE_SCALAR(curTick);

	mainEventQueue.unserialize(cp, "MainEventQueue");
	}

	void
	Serializable::serializeAll()
	{
	string dir = Checkpoint::dir();
	if (mkdir(dir.c_str(), 0775) == -1 && errno != EEXIST)
	fatal("couldn't mkdir %s\n", dir);

	string cpt_file = dir + Checkpoint::baseFilename;
	ofstream outstream(cpt_file.c_str());
	time_t t = time(NULL);
	outstream << "// checkpoint generated: " << ctime(&t);

	globals.serialize(outstream);
	SimObject::serializeAll(outstream);

	assert(Serializable::ckptPrevCount + 1 == Serializable::ckptCount);
	Serializable::ckptPrevCount++;
	if (ckptMaxCount && ++ckptCount >= ckptMaxCount)
	exitSimLoop(curTick + 1, "Maximum number of checkpoints dropped");

	}


	void
	Serializable::unserializeGlobals(Checkpoint *cp)
	{
	globals.unserialize(cp);
	}


	class SerializeEvent : public Event
	{
	protected:
	Tick repeat;

	public:
	SerializeEvent(Tick _when, Tick _repeat);
	virtual void process();
	virtual void serialize(std::ostream &os)
	{
	panic("Cannot serialize the SerializeEvent");
	}

	};

	SerializeEvent::SerializeEvent(Tick _when, Tick _repeat)
	: Event(&mainEventQueue, Serialize_Pri), repeat(_repeat)
	{
	setFlags(AutoDelete);
	schedule(_when);
	}

	void
	SerializeEvent::process()
	{
	Serializable::serializeAll();
	if (repeat)
	schedule(curTick + repeat);
	}

	const char *Checkpoint::baseFilename = "m5.cpt";

	static string checkpointDirBase;

	string
	Checkpoint::dir()
	{
	// use csprintf to insert curTick into directory name if it
	// appears to have a format placeholder in it.
	return (checkpointDirBase.find("%") != string::npos) ?
	csprintf(checkpointDirBase, curTick) : checkpointDirBase;
	}

	void
	Checkpoint::setup(Tick when, Tick period)
	{
	new SerializeEvent(when, period);
	}

	class SerializeParamContext : public ParamContext
	{
	private:
	SerializeEvent *event;

	public:
	SerializeParamContext(const string &section);
	~SerializeParamContext();
	void checkParams();
	};

	SerializeParamContext serialParams("serialize");

	Param<string> serialize_dir(&serialParams, "dir",
	"dir to stick checkpoint in "
	"(sprintf format with cycle #)");

	Param<Counter> serialize_cycle(&serialParams,
	"cycle",
	"cycle to serialize",
	0);

	Param<Counter> serialize_period(&serialParams,
	"period",
	"period to repeat serializations",
	0);

	Param<int> serialize_count(&serialParams, "count",
	"maximum number of checkpoints to drop");

	SerializeParamContext::SerializeParamContext(const string &section)
	: ParamContext(section), event(NULL)
	{ }

	SerializeParamContext::~SerializeParamContext()
	{
	}

	void
	SerializeParamContext::checkParams()
	{
	checkpointDirBase = simout.resolve(serialize_dir);

	// guarantee that directory ends with a '/'
	if (checkpointDirBase[checkpointDirBase.size() - 1] != '/')
	checkpointDirBase += "/";

	if (serialize_cycle > 0)
	Checkpoint::setup(serialize_cycle, serialize_period);

	Serializable::ckptMaxCount = serialize_count;
	}

	void
	debug_serialize()
	{
	Serializable::serializeAll();
	}

	void
	debug_serialize(Tick when)
	{
	new SerializeEvent(when, 0);
	}

	////////////////////////////////////////////////////////////////////////
	//
	// SerializableClass member definitions
	//
	////////////////////////////////////////////////////////////////////////

	// Map of class names to SerializableBuilder creation functions.
	// Need to make this a pointer so we can force initialization on the
	// first reference; otherwise, some SerializableClass constructors
	// may be invoked before the classMap constructor.
	map<string,SerializableClass::CreateFunc> *SerializableClass::classMap = 0;

	// SerializableClass constructor: add mapping to classMap
	SerializableClass::SerializableClass(const string &className,
	CreateFunc createFunc)
	{
	if (classMap == NULL)
	classMap = new map<string,SerializableClass::CreateFunc>();

	if ((*classMap)[className])
	{
	cerr << "Error: simulation object class " << className << " redefined"
	<< endl;
	fatal("");
	}

	// add className --> createFunc to class map
	(*classMap)[className] = createFunc;
	}


	//
	//
	Serializable *
	SerializableClass::createObject(Checkpoint *cp,
	const std::string &section)
	{
	string className;

	if (!cp->find(section, "type", className)) {
	fatal("Serializable::create: no 'type' entry in section '%s'.\n",
	section);
	}

	CreateFunc createFunc = (*classMap)[className];

	if (createFunc == NULL) {
	fatal("Serializable::create: no create function for class '%s'.\n",
	className);
	}

	Serializable *object = createFunc(cp, section);

	assert(object != NULL);

	return object;
	}


	Serializable *
	Serializable::create(Checkpoint *cp, const std::string &section)
	{
	Serializable *object = SerializableClass::createObject(cp, section);
	object->unserialize(cp, section);
	return object;
	}


	Checkpoint::Checkpoint(const std::string &cpt_dir, const std::string &path,
	const ConfigNode *_configNode)
	: db(new IniFile), basePath(path), configNode(_configNode), cptDir(cpt_dir)
	{
	string filename = cpt_dir + "/" + Checkpoint::baseFilename;
	if (!db->load(filename)) {
	fatal("Can't load checkpoint file '%s'\n", filename);
	}
	}


	bool
	Checkpoint::find(const std::string &section, const std::string &entry,
	std::string &value)
	{
	return db->find(section, entry, value);
	}


	bool
	Checkpoint::findObj(const std::string &section, const std::string &entry,
	Serializable *&value)
	{
	string path;

	if (!db->find(section, entry, path))
	return false;

	if ((value = configNode->resolveSimObject(path)) != NULL)
	return true;

	if ((value = objMap[path]) != NULL)
	return true;

	return false;
	}


	bool
	Checkpoint::sectionExists(const std::string &section)
	{
	return db->sectionExists(section);
	}