serialize.hh

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 * property including but not limited to intellectual property relating
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 * modified or unmodified, in source code or in binary form.
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/* @file
 * Serialization Interface Declarations
 */
 
#ifndef __SERIALIZE_HH__
#define __SERIALIZE_HH__
 
 
#include <algorithm>
#include <iostream>
#include <list>
#include <map>
#include <stack>
#include <set>
#include <vector>
 
#include "base/bitunion.hh"
#include "base/logging.hh"
#include "base/str.hh"
 
class IniFile;
class SimObject;
class SimObjectResolver;
 
typedef std::ostream CheckpointOut;
 
class CheckpointIn
{
  private:
 
    IniFile *db;
 
    SimObjectResolver &objNameResolver;
 
    const std::string _cptDir;
 
  public:
    CheckpointIn(const std::string &cpt_dir, SimObjectResolver &resolver);
    ~CheckpointIn();
 
    const std::string getCptDir() { return _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); //end of api_checkout group
 
    // 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:
    static std::string setDir(const std::string &base_name);
 
    static std::string dir();
 
    // Filename for base checkpoint file within directory.
    static const char *baseFilename;
};
 
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);
        } //end of api_serialize group
 
        ~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 void serializeAll(const std::string &cpt_dir);
 
    static void unserializeGlobals(CheckpointIn &cp);
 
  private:
    static std::stack<std::string> path;
};
 
template <class T>
bool
parseParam(const std::string &s, T &value)
{
    // The base implementations use to_number for parsing and '<<' for
    // displaying, suitable for integer types.
    return to_number(s, value);
}
 
template <class T>
void
showParam(CheckpointOut &os, const T &value)
{
    os << value;
}
 
template <class T>
bool
parseParam(const std::string &s, BitUnionType<T> &value)
{
    // Zero initialize storage to avoid leaking an uninitialized value
    BitUnionBaseType<T> storage = BitUnionBaseType<T>();
    auto res = to_number(s, storage);
    value = storage;
    return res;
}
 
template <class T>
void
showParam(CheckpointOut &os, const BitUnionType<T> &value)
{
    auto storage = static_cast<BitUnionBaseType<T>>(value);
 
    // For a BitUnion8, the storage type is an unsigned char.
    // Since we want to serialize a number we need to cast to
    // unsigned int
    os << ((sizeof(storage) == 1) ?
        static_cast<unsigned int>(storage) : storage);
}
 
template <>
inline void
showParam(CheckpointOut &os, const char &value)
{
    // Treat 8-bit ints (chars) as ints on output, not as chars
    os << (int)value;
}
 
template <>
inline void
showParam(CheckpointOut &os, const signed char &value)
{
    os << (int)value;
}
 
template <>
inline void
showParam(CheckpointOut &os, const unsigned char &value)
{
    os << (unsigned int)value;
}
 
template <>
inline bool
parseParam(const std::string &s, float &value)
{
    return to_number(s, value);
}
 
template <>
inline bool
parseParam(const std::string &s, double &value)
{
    return to_number(s, value);
}
 
template <>
inline bool
parseParam(const std::string &s, bool &value)
{
    return to_bool(s, value);
}
 
template <>
inline void
showParam(CheckpointOut &os, const bool &value)
{
    // Display bools as strings
    os << (value ? "true" : "false");
}
 
template <>
inline bool
parseParam(const std::string &s, std::string &value)
{
    // String requires no processing to speak of
    value = s;
    return true;
}
 
template <class T>
void
paramOut(CheckpointOut &os, const std::string &name, const T &param)
{
    os << name << "=";
    showParam(os, param);
    os << "\n";
}
 
template <class T>
void
paramIn(CheckpointIn &cp, const std::string &name, T &param)
{
    const std::string &section(Serializable::currentSection());
    std::string str;
    if (!cp.find(section, name, str) || !parseParam(str, param)) {
        fatal("Can't unserialize '%s:%s'\n", section, name);
    }
}
 
template <class T>
bool
optParamIn(CheckpointIn &cp, const std::string &name,
           T &param, bool warn = true)
{
    const std::string &section(Serializable::currentSection());
    std::string str;
    if (!cp.find(section, name, str) || !parseParam(str, param)) {
        if (warn)
            warn("optional parameter %s:%s not present\n", section, name);
        return false;
    } else {
        return true;
    }
}
 
template <class T>
void
arrayParamOut(CheckpointOut &os, const std::string &name,
              const std::vector<T> &param)
{
    typename std::vector<T>::size_type size = param.size();
    os << name << "=";
    if (size > 0)
        showParam(os, param[0]);
    for (typename std::vector<T>::size_type i = 1; i < size; ++i) {
        os << " ";
        showParam(os, param[i]);
    }
    os << "\n";
}
 
template <class T>
void
arrayParamOut(CheckpointOut &os, const std::string &name,
              const std::list<T> &param)
{
    typename std::list<T>::const_iterator it = param.begin();
 
    os << name << "=";
    if (param.size() > 0)
        showParam(os, *it);
    it++;
    while (it != param.end()) {
        os << " ";
        showParam(os, *it);
        it++;
    }
    os << "\n";
}
 
template <class T>
void
arrayParamOut(CheckpointOut &os, const std::string &name,
              const std::set<T> &param)
{
    typename std::set<T>::const_iterator it = param.begin();
 
    os << name << "=";
    if (param.size() > 0)
        showParam(os, *it);
    it++;
    while (it != param.end()) {
        os << " ";
        showParam(os, *it);
        it++;
    }
    os << "\n";
}
 
template <class T>
void
arrayParamOut(CheckpointOut &os, const std::string &name,
              const T *param, unsigned size)
{
    os << name << "=";
    if (size > 0)
        showParam(os, param[0]);
    for (unsigned i = 1; i < size; ++i) {
        os << " ";
        showParam(os, param[i]);
    }
    os << "\n";
}
 
template <class T>
void
arrayParamIn(CheckpointIn &cp, const std::string &name,
             T *param, unsigned size)
{
    const std::string &section(Serializable::currentSection());
    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...
 
    std::vector<std::string> tokens;
 
    tokenize(tokens, str, ' ');
 
    // Need this if we were doing a vector
    // value.resize(tokens.size());
 
    fatal_if(tokens.size() != size,
             "Array size mismatch on %s:%s (Got %u, expected %u)'\n",
             section, name, tokens.size(), size);
 
    for (std::vector<std::string>::size_type 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)) {
            std::string err("could not parse \"");
 
            err += str;
            err += "\"";
 
            fatal(err);
        }
 
        // assign parsed value to vector
        param[i] = scalar_value;
    }
}
 
template <class T>
void
arrayParamIn(CheckpointIn &cp, const std::string &name, std::vector<T> &param)
{
    const std::string &section(Serializable::currentSection());
    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...
 
    std::vector<std::string> tokens;
 
    tokenize(tokens, str, ' ');
 
    // Need this if we were doing a vector
    // value.resize(tokens.size());
 
    param.resize(tokens.size());
 
    for (std::vector<std::string>::size_type 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)) {
            std::string err("could not parse \"");
 
            err += str;
            err += "\"";
 
            fatal(err);
        }
 
        // assign parsed value to vector
        param[i] = scalar_value;
    }
}
 
template <class T>
void
arrayParamIn(CheckpointIn &cp, const std::string &name, std::list<T> &param)
{
    const std::string &section(Serializable::currentSection());
    std::string str;
    if (!cp.find(section, name, str)) {
        fatal("Can't unserialize '%s:%s'\n", section, name);
    }
    param.clear();
 
    std::vector<std::string> tokens;
    tokenize(tokens, str, ' ');
 
    for (std::vector<std::string>::size_type i = 0; i < tokens.size(); i++) {
        T scalar_value;
        if (!parseParam(tokens[i], scalar_value)) {
            std::string err("could not parse \"");
 
            err += str;
            err += "\"";
 
            fatal(err);
        }
 
        // assign parsed value to vector
        param.push_back(scalar_value);
    }
}
 
template <class T>
void
arrayParamIn(CheckpointIn &cp, const std::string &name, std::set<T> &param)
{
    const std::string &section(Serializable::currentSection());
    std::string str;
    if (!cp.find(section, name, str)) {
        fatal("Can't unserialize '%s:%s'\n", section, name);
    }
    param.clear();
 
    std::vector<std::string> tokens;
    tokenize(tokens, str, ' ');
 
    for (std::vector<std::string>::size_type i = 0; i < tokens.size(); i++) {
        T scalar_value;
        if (!parseParam(tokens[i], scalar_value)) {
            std::string err("could not parse \"");
 
            err += str;
            err += "\"";
 
            fatal(err);
        }
 
        // assign parsed value to vector
        param.insert(scalar_value);
    }
}
 
void
debug_serialize(const std::string &cpt_dir);
 
 
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)
 
#endif // __SERIALIZE_HH__