serialize.hh

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· HH 代码 · 共 257 行

/*
 * Copyright (c) 2002, 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Nathan L. Binkert
 *          Erik G. Hallnor
 *          Steven K. Reinhardt
 */

/* @file
 * Serialization Interface Declarations
 */

#ifndef __SERIALIZE_HH__
#define __SERIALIZE_HH__


#include <list>
#include <vector>
#include <iostream>
#include <map>

#include "sim/host.hh"

class IniFile;
class Serializable;
class Checkpoint;
class SimObject;

template <class T>
void paramOut(std::ostream &os, const std::string &name, const T &param);

template <class T>
void paramIn(Checkpoint *cp, const std::string &section,
             const std::string &name, T &param);

template <class T>
void arrayParamOut(std::ostream &os, const std::string &name,
                   const T *param, int size);

template <class T>
void arrayParamOut(std::ostream &os, const std::string &name,
                   const std::vector<T> &param);

template <class T>
void arrayParamIn(Checkpoint *cp, const std::string &section,
                  const std::string &name, T *param, int size);

template <class T>
void arrayParamIn(Checkpoint *cp, const std::string &section,
                  const std::string &name, std::vector<T> &param);

void
objParamIn(Checkpoint *cp, const std::string &section,
           const std::string &name, SimObject * &param);


//
// These macros are streamlined to use in serialize/unserialize
// functions.  It's assumed that serialize() has a parameter 'os' for
// the ostream, and unserialize() has parameters 'cp' and 'section'.
#define SERIALIZE_SCALAR(scalar)	paramOut(os, #scalar, scalar)

#define UNSERIALIZE_SCALAR(scalar)	paramIn(cp, section, #scalar, scalar)

// ENUMs are like SCALARs, but we cast them to ints on the way out
#define SERIALIZE_ENUM(scalar)		paramOut(os, #scalar, (int)scalar)

#define UNSERIALIZE_ENUM(scalar)		\
 do {						\
    int tmp;					\
    paramIn(cp, section, #scalar, tmp);		\
    scalar = (typeof(scalar))tmp;		\
  } while (0)

#define SERIALIZE_ARRAY(member, size)	\
        arrayParamOut(os, #member, member, size)

#define UNSERIALIZE_ARRAY(member, size)	\
        arrayParamIn(cp, section, #member, member, size)

#define SERIALIZE_OBJPTR(objptr)	paramOut(os, #objptr, (objptr)->name())

#define UNSERIALIZE_OBJPTR(objptr)			\
  do {							\
    SimObject *sptr;				\
    objParamIn(cp, section, #objptr, sptr);		\
    objptr = dynamic_cast<typeof(objptr)>(sptr);	\
  } while (0)

/*
 * Basic support for object serialization.
 */
class Serializable
{
  protected:
    void nameOut(std::ostream &os);
    void nameOut(std::ostream &os, const std::string &_name);

  public:
    Serializable() {}
    virtual ~Serializable() {}

    // manditory virtual function, so objects must provide names
    virtual const std::string name() const = 0;

    virtual void serialize(std::ostream &os) {}
    virtual void unserialize(Checkpoint *cp, const std::string &section) {}

    static Serializable *create(Checkpoint *cp,
                                 const std::string &section);

    static int ckptCount;
    static int ckptMaxCount;
    static int ckptPrevCount;
    static void serializeAll(const std::string &cpt_dir);
    static void unserializeAll(const std::string &cpt_dir);
    static void unserializeGlobals(Checkpoint *cp);
};

//
// A SerializableBuilder serves as an evaluation context for a set of
// parameters that describe a specific instance of a Serializable.  This
// evaluation context corresponds to a section in the .ini file (as
// with the base ParamContext) plus an optional node in the
// configuration hierarchy (the configNode member) for resolving
// Serializable references.  SerializableBuilder is an abstract superclass;
// derived classes specialize the class for particular subclasses of
// Serializable (e.g., BaseCache).
//
// For typical usage, see the definition of
// SerializableClass::createObject().
//
class SerializableBuilder
{
  public:

    SerializableBuilder() {}

    virtual ~SerializableBuilder() {}

    // Create the actual Serializable corresponding to the parameter
    // values in this context.  This function is overridden in derived
    // classes to call a specific constructor for a particular
    // subclass of Serializable.
    virtual Serializable *create() = 0;
};

//
// An instance of SerializableClass corresponds to a class derived from
// Serializable.  The SerializableClass instance serves to bind the string
// name (found in the config file) to a function that creates an
// instance of the appropriate derived class.
//
// This would be much cleaner in Smalltalk or Objective-C, where types
// are first-class objects themselves.
//
class SerializableClass
{
  public:

    // Type CreateFunc is a pointer to a function that creates a new
    // simulation object builder based on a .ini-file parameter
    // section (specified by the first string argument), a unique name
    // for the object (specified by the second string argument), and
    // an optional config hierarchy node (specified by the third
    // argument).  A pointer to the new SerializableBuilder is returned.
    typedef Serializable *(*CreateFunc)(Checkpoint *cp,
                                        const std::string &section);

    static std::map<std::string,CreateFunc> *classMap;

    // Constructor.  For example:
    //
    // SerializableClass baseCacheSerializableClass("BaseCacheSerializable",
    //                         newBaseCacheSerializableBuilder);
    //
    SerializableClass(const std::string &className, CreateFunc createFunc);

    // create Serializable given name of class and pointer to
    // configuration hierarchy node
    static Serializable *createObject(Checkpoint *cp,
                                      const std::string &section);
};

//
// Macros to encapsulate the magic of declaring & defining
// SerializableBuilder and SerializableClass objects
//

#define REGISTER_SERIALIZEABLE(CLASS_NAME, OBJ_CLASS)			   \
SerializableClass the##OBJ_CLASS##Class(CLASS_NAME,			   \
                                         OBJ_CLASS::createForUnserialize);

void
setCheckpointDir(const std::string &name);

class Checkpoint
{
  private:

    IniFile *db;
    const std::string basePath;
    std::map<std::string, Serializable*> objMap;

  public:
    Checkpoint(const std::string &cpt_dir, const std::string &path);

    const std::string cptDir;

    bool find(const std::string &section, const std::string &entry,
              std::string &value);

    bool findObj(const std::string &section, const std::string &entry,
                 SimObject *&value);

    bool sectionExists(const std::string &section);

    // The following static functions have to do with checkpoint
    // creation rather than restoration.  This class makes a handy
    // namespace for them though.

    // Export current checkpoint directory name so other objects can
    // derive filenames from it (e.g., memory).  The return value is
    // guaranteed to end in '/' so filenames can be directly appended.
    // This function is only valid while a checkpoint is being created.
    static std::string dir();

    // Filename for base checkpoint file within directory.
    static const char *baseFilename;
};

#endif // __SERIALIZE_HH__