src/sim/serialize.hh

   1 /*
   2  * Copyright (c) 2002-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Nathan Binkert
  29  *          Erik Hallnor
  30  *          Steve Reinhardt
  31  */
  32
  33 /* @file
  34  * Serialization Interface Declarations
  35  */
  36
  37 #ifndef __SERIALIZE_HH__
  38 #define __SERIALIZE_HH__
  39
  40
  41 #include <list>
  42 #include <vector>
  43 #include <iostream>
  44 #include <map>
  45
  46 #include "sim/host.hh"
  47
  48 class IniFile;
  49 class Serializable;
  50 class Checkpoint;
  51 class SimObject;
  52
  53 template <class T>
  54 void paramOut(std::ostream &os, const std::string &name, const T &param);
  55
  56 template <class T>
  57 void paramIn(Checkpoint *cp, const std::string &section,
  58              const std::string &name, T &param);
  59
  60 template <class T>
  61 void arrayParamOut(std::ostream &os, const std::string &name,
  62                    const T *param, int size);
  63
  64 template <class T>
  65 void arrayParamOut(std::ostream &os, const std::string &name,
  66                    const std::vector<T> &param);
  67
  68 template <class T>
  69 void arrayParamIn(Checkpoint *cp, const std::string &section,
  70                   const std::string &name, T *param, int size);
  71
  72 template <class T>
  73 void arrayParamIn(Checkpoint *cp, const std::string &section,
  74                   const std::string &name, std::vector<T> &param);
  75
  76 void
  77 objParamIn(Checkpoint *cp, const std::string &section,
  78            const std::string &name, SimObject * &param);
  79
  80
  81 //
  82 // These macros are streamlined to use in serialize/unserialize
  83 // functions.  It's assumed that serialize() has a parameter 'os' for
  84 // the ostream, and unserialize() has parameters 'cp' and 'section'.
  85 #define SERIALIZE_SCALAR(scalar)        paramOut(os, #scalar, scalar)
  86
  87 #define UNSERIALIZE_SCALAR(scalar)      paramIn(cp, section, #scalar, scalar)
  88
  89 // ENUMs are like SCALARs, but we cast them to ints on the way out
  90 #define SERIALIZE_ENUM(scalar)          paramOut(os, #scalar, (int)scalar)
  91
  92 #define UNSERIALIZE_ENUM(scalar)                \
  93  do {                                           \
  94     int tmp;                                    \
  95     paramIn(cp, section, #scalar, tmp);         \
  96     scalar = (typeof(scalar))tmp;               \
  97   } while (0)
  98
  99 #define SERIALIZE_ARRAY(member, size)           \
 100         arrayParamOut(os, #member, member, size)
 101
 102 #define UNSERIALIZE_ARRAY(member, size)         \
 103         arrayParamIn(cp, section, #member, member, size)
 104
 105 #define SERIALIZE_OBJPTR(objptr)        paramOut(os, #objptr, (objptr)->name())
 106
 107 #define UNSERIALIZE_OBJPTR(objptr)                      \
 108   do {                                                  \
 109     SimObject *sptr;                                    \
 110     objParamIn(cp, section, #objptr, sptr);             \
 111     objptr = dynamic_cast<typeof(objptr)>(sptr);        \
 112   } while (0)
 113
 114 /*
 115  * Basic support for object serialization.
 116  */
 117 class Serializable
 118 {
 119   protected:
 120     void nameOut(std::ostream &os);
 121     void nameOut(std::ostream &os, const std::string &_name);
 122
 123   public:
 124     Serializable() {}
 125     virtual ~Serializable() {}
 126
 127     // manditory virtual function, so objects must provide names
 128     virtual const std::string name() const = 0;
 129
 130     virtual void serialize(std::ostream &os) {}
 131     virtual void unserialize(Checkpoint *cp, const std::string &section) {}
 132
 133     static Serializable *create(Checkpoint *cp,
 134                                  const std::string &section);
 135
 136     static int ckptCount;
 137     static int ckptMaxCount;
 138     static int ckptPrevCount;
 139     static void serializeAll(const std::string &cpt_dir);
 140     static void unserializeAll(const std::string &cpt_dir);
 141     static void unserializeGlobals(Checkpoint *cp);
 142 };
 143
 144 //
 145 // A SerializableBuilder serves as an evaluation context for a set of
 146 // parameters that describe a specific instance of a Serializable.  This
 147 // evaluation context corresponds to a section in the .ini file (as
 148 // with the base ParamContext) plus an optional node in the
 149 // configuration hierarchy (the configNode member) for resolving
 150 // Serializable references.  SerializableBuilder is an abstract superclass;
 151 // derived classes specialize the class for particular subclasses of
 152 // Serializable (e.g., BaseCache).
 153 //
 154 // For typical usage, see the definition of
 155 // SerializableClass::createObject().
 156 //
 157 class SerializableBuilder
 158 {
 159   public:
 160
 161     SerializableBuilder() {}
 162
 163     virtual ~SerializableBuilder() {}
 164
 165     // Create the actual Serializable corresponding to the parameter
 166     // values in this context.  This function is overridden in derived
 167     // classes to call a specific constructor for a particular
 168     // subclass of Serializable.
 169     virtual Serializable *create() = 0;
 170 };
 171
 172 //
 173 // An instance of SerializableClass corresponds to a class derived from
 174 // Serializable.  The SerializableClass instance serves to bind the string
 175 // name (found in the config file) to a function that creates an
 176 // instance of the appropriate derived class.
 177 //
 178 // This would be much cleaner in Smalltalk or Objective-C, where types
 179 // are first-class objects themselves.
 180 //
 181 class SerializableClass
 182 {
 183   public:
 184
 185     // Type CreateFunc is a pointer to a function that creates a new
 186     // simulation object builder based on a .ini-file parameter
 187     // section (specified by the first string argument), a unique name
 188     // for the object (specified by the second string argument), and
 189     // an optional config hierarchy node (specified by the third
 190     // argument).  A pointer to the new SerializableBuilder is returned.
 191     typedef Serializable *(*CreateFunc)(Checkpoint *cp,
 192                                         const std::string &section);
 193
 194     static std::map<std::string,CreateFunc> *classMap;
 195
 196     // Constructor.  For example:
 197     //
 198     // SerializableClass baseCacheSerializableClass("BaseCacheSerializable",
 199     //                         newBaseCacheSerializableBuilder);
 200     //
 201     SerializableClass(const std::string &className, CreateFunc createFunc);
 202
 203     // create Serializable given name of class and pointer to
 204     // configuration hierarchy node
 205     static Serializable *createObject(Checkpoint *cp,
 206                                       const std::string &section);
 207 };
 208
 209 //
 210 // Macros to encapsulate the magic of declaring & defining
 211 // SerializableBuilder and SerializableClass objects
 212 //
 213
 214 #define REGISTER_SERIALIZEABLE(CLASS_NAME, OBJ_CLASS)                      \
 215 SerializableClass the##OBJ_CLASS##Class(CLASS_NAME,                        \
 216                                          OBJ_CLASS::createForUnserialize);
 217
 218 void
 219 setCheckpointDir(const std::string &name);
 220
 221 class Checkpoint
 222 {
 223   private:
 224
 225     IniFile *db;
 226     const std::string basePath;
 227     std::map<std::string, Serializable*> objMap;
 228
 229   public:
 230     Checkpoint(const std::string &cpt_dir, const std::string &path);
 231
 232     const std::string cptDir;
 233
 234     bool find(const std::string &section, const std::string &entry,
 235               std::string &value);
 236
 237     bool findObj(const std::string &section, const std::string &entry,
 238                  SimObject *&value);
 239
 240     bool sectionExists(const std::string &section);
 241
 242     // The following static functions have to do with checkpoint
 243     // creation rather than restoration.  This class makes a handy
 244     // namespace for them though.
 245
 246     // Export current checkpoint directory name so other objects can
 247     // derive filenames from it (e.g., memory).  The return value is
 248     // guaranteed to end in '/' so filenames can be directly appended.
 249     // This function is only valid while a checkpoint is being created.
 250     static std::string dir();
 251
 252     // Filename for base checkpoint file within directory.
 253     static const char *baseFilename;
 254 };
 255
 256 #endif // __SERIALIZE_HH__