serialize.hh

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 * Authors: Nathan Binkert
 *          Erik Hallnor
 *          Steve Reinhardt
 *          Andreas Sandberg
 */

/* @file
 * Serialization Interface Declarations
 */

#ifndef __SERIALIZE_HH__
#define __SERIALIZE_HH__


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

#include "base/bitunion.hh"

class CheckpointIn;
class IniFile;
class Serializable;
class SimObject;
class SimObjectResolver;

typedef std::ostream CheckpointOut;


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

template <typename DataType, typename BitUnion>
void paramOut(CheckpointOut &cp, const std::string &name,
              const BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
{
    paramOut(cp, name, p.__data);
}

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

template <typename DataType, typename BitUnion>
void paramIn(CheckpointIn &cp, const std::string &name,
             BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
{
    paramIn(cp, name, p.__data);
}

template <class T>
bool optParamIn(CheckpointIn &cp, const std::string &name, T &param,
                bool warn = true);

template <typename DataType, typename BitUnion>
bool optParamIn(CheckpointIn &cp, const std::string &name,
                BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p,
                bool warn = true)
{
    return optParamIn(cp, name, p.__data, warn);
}

template <class T>
void arrayParamOut(CheckpointOut &cp, const std::string &name,
                   const T *param, unsigned size);

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

template <class T>
void arrayParamOut(CheckpointOut &cp, const std::string &name,
                   const std::list<T> &param);

template <class T>
void arrayParamOut(CheckpointOut &cp, const std::string &name,
                   const std::set<T> &param);

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

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

template <class T>
void arrayParamIn(CheckpointIn &cp, const std::string &name,
                  std::list<T> &param);

template <class T>
void arrayParamIn(CheckpointIn &cp, const std::string &name,
                  std::set<T> &param);

void
objParamIn(CheckpointIn &cp, 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(cp, #scalar, scalar)

#define UNSERIALIZE_SCALAR(scalar)      paramIn(cp, #scalar, scalar)
#define UNSERIALIZE_OPT_SCALAR(scalar)      optParamIn(cp, #scalar, scalar)

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

#define UNSERIALIZE_ENUM(scalar)                        \
    do {                                                \
        int tmp;                                        \
        paramIn(cp, #scalar, tmp);                      \
        scalar = static_cast<decltype(scalar)>(tmp);    \
    } while (0)

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

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

#define SERIALIZE_CONTAINER(member)             \
        arrayParamOut(cp, #member, member)

#define UNSERIALIZE_CONTAINER(member)           \
        arrayParamIn(cp, #member, member)

#define SERIALIZE_EVENT(event) event.serializeSection(cp, #event);

#define UNSERIALIZE_EVENT(event)                        \
    do {                                                \
        event.unserializeSection(cp, #event);           \
        eventQueue()->checkpointReschedule(&event);     \
    } while (0)

#define SERIALIZE_OBJ(obj) obj.serializeSection(cp, #obj)
#define UNSERIALIZE_OBJ(obj) obj.unserializeSection(cp, #obj)

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

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

class Serializable
{
  protected:
    class ScopedCheckpointSection {
      public:
        template<class CP>
        ScopedCheckpointSection(CP &cp, const char *name) {
            pushName(name);
            nameOut(cp);
        }

        template<class CP>
        ScopedCheckpointSection(CP &cp, const std::string &name) {
            pushName(name.c_str());
            nameOut(cp);
        }

        ~ScopedCheckpointSection();

        ScopedCheckpointSection() = delete;
        ScopedCheckpointSection(const ScopedCheckpointSection &) = delete;
        ScopedCheckpointSection &operator=(
            const ScopedCheckpointSection &) = delete;
        ScopedCheckpointSection &operator=(
            ScopedCheckpointSection &&) = delete;

      private:
        void pushName(const char *name);
        void nameOut(CheckpointOut &cp);
        void nameOut(CheckpointIn &cp) {};
    };

  public:
    Serializable();
    virtual ~Serializable();

    virtual void serialize(CheckpointOut &cp) const = 0;

    virtual void unserialize(CheckpointIn &cp) = 0;

    void serializeSection(CheckpointOut &cp, const char *name) const;

    void serializeSection(CheckpointOut &cp, const std::string &name) const {
        serializeSection(cp, name.c_str());
    }

    void unserializeSection(CheckpointIn &cp, const char *name);

    void unserializeSection(CheckpointIn &cp, const std::string &name) {
        unserializeSection(cp, name.c_str());
    }

    static const std::string &currentSection();

    static int ckptCount;
    static int ckptMaxCount;
    static int ckptPrevCount;
    static void serializeAll(const std::string &cpt_dir);
    static void unserializeGlobals(CheckpointIn &cp);

  private:
    static std::stack<std::string> path;
};

void debug_serialize(const std::string &cpt_dir);


class CheckpointIn
{
  private:

    IniFile *db;

    SimObjectResolver &objNameResolver;

  public:
    CheckpointIn(const std::string &cpt_dir, SimObjectResolver &resolver);
    ~CheckpointIn();

    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 entryExists(const std::string &section, const std::string &entry);
    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.  Currently no Checkpoint object is
    // created on serialization (only unserialization) so we track the
    // directory name as a global.  It would be nice to change this
    // someday

  private:
    // current directory we're serializing into.
    static std::string currentDirectory;

  public:
    // Set the current directory.  This function takes care of
    // inserting curTick() if there's a '%d' in the argument, and
    // appends a '/' if necessary.  The final name is returned.
    static std::string setDir(const std::string &base_name);

    // 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__