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Diffstat (limited to 'src/sim/serialize.hh')
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diff --git a/src/sim/serialize.hh b/src/sim/serialize.hh new file mode 100644 index 000000000..d8f5f8fc5 --- /dev/null +++ b/src/sim/serialize.hh @@ -0,0 +1,243 @@ +/* + * 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. + */ + +/* @file + * Serialization Interface Declarations + */ + +#ifndef __SERIALIZE_HH__ +#define __SERIALIZE_HH__ + + +#include <list> +#include <iostream> +#include <map> + +#include "sim/host.hh" +#include "sim/configfile.hh" + +class Serializable; +class Checkpoint; + +template <class T> +void paramOut(std::ostream &os, const std::string &name, const T ¶m); + +template <class T> +void paramIn(Checkpoint *cp, const std::string §ion, + const std::string &name, T ¶m); + +template <class T> +void arrayParamOut(std::ostream &os, const std::string &name, + const T *param, int size); + +template <class T> +void arrayParamIn(Checkpoint *cp, const std::string §ion, + const std::string &name, T *param, int size); + +void +objParamIn(Checkpoint *cp, const std::string §ion, + const std::string &name, Serializable * ¶m); + + +// +// 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 { \ + Serializable *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 §ion) {} + + static Serializable *create(Checkpoint *cp, + const std::string §ion); + + static int ckptCount; + static int ckptMaxCount; + static int ckptPrevCount; + static void serializeAll(); + 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 §ion); + + 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 §ion); +}; + +// +// 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); + +class Checkpoint +{ + private: + + IniFile *db; + const std::string basePath; + const ConfigNode *configNode; + std::map<std::string, Serializable*> objMap; + + public: + Checkpoint(const std::string &cpt_dir, const std::string &path, + const ConfigNode *_configNode); + + const std::string cptDir; + + bool find(const std::string §ion, const std::string &entry, + std::string &value); + + bool findObj(const std::string §ion, const std::string &entry, + Serializable *&value); + + bool sectionExists(const std::string §ion); + + // 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; + + // Set up a checkpoint creation event or series of events. + static void setup(Tick when, Tick period = 0); +}; + +#endif // __SERIALIZE_HH__ |