b90711ea53
This patch extends the previous patch's alterations around fd_map. It cleans up some of the uglier code in the process file and replaces it with a more concise C++11 version. As part of the changes, the FdMap class is pulled out of the Process class and receives its own file.
514 lines
18 KiB
C++
514 lines
18 KiB
C++
/*
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* Copyright (c) 2015 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2002-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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* Erik Hallnor
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* Steve Reinhardt
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* Andreas Sandberg
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*/
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/* @file
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* Serialization Interface Declarations
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*/
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#ifndef __SERIALIZE_HH__
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#define __SERIALIZE_HH__
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#include <iostream>
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#include <list>
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#include <map>
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#include <stack>
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#include <vector>
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#include "base/bitunion.hh"
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#include "base/types.hh"
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class IniFile;
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class Serializable;
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class CheckpointIn;
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class SimObject;
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class EventQueue;
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typedef std::ostream CheckpointOut;
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/** The current version of the checkpoint format.
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* This should be incremented by 1 and only 1 for every new version, where a new
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* version is defined as a checkpoint created before this version won't work on
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* the current version until the checkpoint format is updated. Adding a new
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* SimObject shouldn't cause the version number to increase, only changes to
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* existing objects such as serializing/unserializing more state, changing sizes
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* of serialized arrays, etc. */
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static const uint64_t gem5CheckpointVersion = 0x000000000000000f;
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template <class T>
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void paramOut(CheckpointOut &cp, const std::string &name, const T ¶m);
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template <typename DataType, typename BitUnion>
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void paramOut(CheckpointOut &cp, const std::string &name,
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const BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
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{
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paramOut(cp, name, p.__data);
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}
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template <class T>
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void paramIn(CheckpointIn &cp, const std::string &name, T ¶m);
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template <typename DataType, typename BitUnion>
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void paramIn(CheckpointIn &cp, const std::string &name,
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BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
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{
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paramIn(cp, name, p.__data);
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}
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template <class T>
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bool optParamIn(CheckpointIn &cp, const std::string &name, T ¶m);
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template <typename DataType, typename BitUnion>
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bool optParamIn(CheckpointIn &cp, const std::string &name,
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BitfieldBackend::BitUnionOperators<DataType, BitUnion> &p)
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{
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return optParamIn(cp, name, p.__data);
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}
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template <class T>
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void arrayParamOut(CheckpointOut &cp, const std::string &name,
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const T *param, unsigned size);
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template <class T>
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void arrayParamOut(CheckpointOut &cp, const std::string &name,
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const std::vector<T> ¶m);
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template <class T>
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void arrayParamOut(CheckpointOut &cp, const std::string &name,
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const std::list<T> ¶m);
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template <class T>
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void arrayParamIn(CheckpointIn &cp, const std::string &name,
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T *param, unsigned size);
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template <class T>
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void arrayParamIn(CheckpointIn &cp, const std::string &name,
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std::vector<T> ¶m);
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template <class T>
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void arrayParamIn(CheckpointIn &cp, const std::string &name,
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std::list<T> ¶m);
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void
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objParamIn(CheckpointIn &cp, const std::string &name, SimObject * ¶m);
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template <typename T>
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void fromInt(T &t, int i)
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{
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t = (T)i;
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}
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template <typename T>
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void fromSimObject(T &t, SimObject *s)
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{
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t = dynamic_cast<T>(s);
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}
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//
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// These macros are streamlined to use in serialize/unserialize
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// functions. It's assumed that serialize() has a parameter 'os' for
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// the ostream, and unserialize() has parameters 'cp' and 'section'.
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#define SERIALIZE_SCALAR(scalar) paramOut(cp, #scalar, scalar)
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#define UNSERIALIZE_SCALAR(scalar) paramIn(cp, #scalar, scalar)
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#define UNSERIALIZE_OPT_SCALAR(scalar) optParamIn(cp, #scalar, scalar)
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// ENUMs are like SCALARs, but we cast them to ints on the way out
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#define SERIALIZE_ENUM(scalar) paramOut(cp, #scalar, (int)scalar)
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#define UNSERIALIZE_ENUM(scalar) \
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do { \
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int tmp; \
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paramIn(cp, #scalar, tmp); \
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fromInt(scalar, tmp); \
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} while (0)
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#define SERIALIZE_ARRAY(member, size) \
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arrayParamOut(cp, #member, member, size)
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#define UNSERIALIZE_ARRAY(member, size) \
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arrayParamIn(cp, #member, member, size)
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#define SERIALIZE_CONTAINER(member) \
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arrayParamOut(cp, #member, member)
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#define UNSERIALIZE_CONTAINER(member) \
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arrayParamIn(cp, #member, member)
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#define SERIALIZE_EVENT(event) event.serializeSection(cp, #event);
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#define UNSERIALIZE_EVENT(event) \
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do { \
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event.unserializeSection(cp, #event); \
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eventQueue()->checkpointReschedule(&event); \
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} while(0)
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#define SERIALIZE_OBJ(obj) obj.serializeSection(cp, #obj)
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#define UNSERIALIZE_OBJ(obj) obj.unserializeSection(cp, #obj)
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#define SERIALIZE_OBJPTR(objptr) paramOut(cp, #objptr, (objptr)->name())
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#define UNSERIALIZE_OBJPTR(objptr) \
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do { \
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SimObject *sptr; \
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objParamIn(cp, #objptr, sptr); \
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fromSimObject(objptr, sptr); \
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} while (0)
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/**
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* Basic support for object serialization.
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*
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* Objects that support serialization should derive from this
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* class. Such objects can largely be divided into two categories: 1)
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* True SimObjects (deriving from SimObject), and 2) child objects
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* (non-SimObjects).
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*
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* SimObjects are serialized automatically into their own sections
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* automatically by the SimObject base class (see
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* SimObject::serializeAll().
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*
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* SimObjects can contain other serializable objects that are not
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* SimObjects. Much like normal serialized members are not serialized
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* automatically, these objects will not be serialized automatically
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* and it is expected that the objects owning such serializable
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* objects call the required serialization/unserialization methods on
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* child objects. The preferred method to serialize a child object is
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* to call serializeSection() on the child, which serializes the
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* object into a new subsection in the current section. Another option
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* is to call serialize() directly, which serializes the object into
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* the current section. The latter is not recommended as it can lead
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* to naming clashes between objects.
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*
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* @note Many objects that support serialization need to be put in a
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* consistent state when serialization takes place. We refer to the
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* action of forcing an object into a consistent state as
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* 'draining'. Objects that need draining inherit from Drainable. See
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* Drainable for more information.
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*/
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class Serializable
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{
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protected:
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/**
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* Scoped checkpoint section helper class
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*
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* This helper class creates a section within a checkpoint without
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* the need for a separate serializeable object. It is mainly used
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* within the Serializable class when serializing or unserializing
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* section (see serializeSection() and unserializeSection()). It
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* can also be used to maintain backwards compatibility in
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* existing code that serializes structs that are not inheriting
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* from Serializable into subsections.
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*
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* When the class is instantiated, it appends a name to the active
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* path in a checkpoint. The old path is later restored when the
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* instance is destroyed. For example, serializeSection() could be
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* implemented by instantiating a ScopedCheckpointSection and then
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* calling serialize() on an object.
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*/
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class ScopedCheckpointSection {
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public:
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template<class CP>
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ScopedCheckpointSection(CP &cp, const char *name) {
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pushName(name);
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nameOut(cp);
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}
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template<class CP>
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ScopedCheckpointSection(CP &cp, const std::string &name) {
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pushName(name.c_str());
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nameOut(cp);
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}
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~ScopedCheckpointSection();
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ScopedCheckpointSection() = delete;
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ScopedCheckpointSection(const ScopedCheckpointSection &) = delete;
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ScopedCheckpointSection &operator=(
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const ScopedCheckpointSection &) = delete;
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ScopedCheckpointSection &operator=(
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ScopedCheckpointSection &&) = delete;
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private:
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void pushName(const char *name);
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void nameOut(CheckpointOut &cp);
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void nameOut(CheckpointIn &cp) {};
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};
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public:
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Serializable();
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virtual ~Serializable();
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/**
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* Serialize an object
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*
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* Output an object's state into the current checkpoint section.
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*
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* @param cp Checkpoint state
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*/
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virtual void serialize(CheckpointOut &cp) const = 0;
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/**
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* Unserialize an object
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*
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* Read an object's state from the current checkpoint section.
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*
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* @param cp Checkpoint state
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*/
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virtual void unserialize(CheckpointIn &cp) = 0;
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/**
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* Serialize an object into a new section
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*
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* This method creates a new section in a checkpoint and calls
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* serialize() to serialize the current object into that
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* section. The name of the section is appended to the current
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* checkpoint path.
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*
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* @param cp Checkpoint state
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* @param name Name to append to the active path
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*/
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void serializeSection(CheckpointOut &cp, const char *name) const;
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void serializeSection(CheckpointOut &cp, const std::string &name) const {
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serializeSection(cp, name.c_str());
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}
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/**
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* Unserialize an a child object
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*
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* This method loads a child object from a checkpoint. The object
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* name is appended to the active path to form a fully qualified
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* section name and unserialize() is called.
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*
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* @param cp Checkpoint state
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* @param name Name to append to the active path
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*/
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void unserializeSection(CheckpointIn &cp, const char *name);
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void unserializeSection(CheckpointIn &cp, const std::string &name) {
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unserializeSection(cp, name.c_str());
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}
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/**
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* @{
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* @name Legacy interface
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*
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* Interface for objects that insist on changing their state when
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* serializing. Such state change should be done in drain(),
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* memWriteback(), or memInvalidate() and not in the serialization
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* method. In general, if state changes occur in serialize, it
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* complicates testing since it breaks assumptions about draining
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* and serialization. It potentially also makes components more
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* fragile since they there are no ordering guarantees when
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* serializing SimObjects.
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*
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* @warn This interface is considered deprecated and should never
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* be used.
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*/
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virtual void serializeOld(CheckpointOut &cp) {
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serialize(cp);
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}
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void serializeSectionOld(CheckpointOut &cp, const char *name);
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void serializeSectionOld(CheckpointOut &cp, const std::string &name) {
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serializeSectionOld(cp, name.c_str());
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}
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/** @} */
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/** Get the fully-qualified name of the active section */
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static const std::string ¤tSection();
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static Serializable *create(CheckpointIn &cp, const std::string §ion);
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static int ckptCount;
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static int ckptMaxCount;
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static int ckptPrevCount;
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static void serializeAll(const std::string &cpt_dir);
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static void unserializeGlobals(CheckpointIn &cp);
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private:
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static std::stack<std::string> path;
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};
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void debug_serialize(const std::string &cpt_dir);
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//
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// A SerializableBuilder serves as an evaluation context for a set of
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// parameters that describe a specific instance of a Serializable. This
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// evaluation context corresponds to a section in the .ini file (as
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// with the base ParamContext) plus an optional node in the
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// configuration hierarchy (the configNode member) for resolving
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// Serializable references. SerializableBuilder is an abstract superclass;
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// derived classes specialize the class for particular subclasses of
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// Serializable (e.g., BaseCache).
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//
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// For typical usage, see the definition of
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// SerializableClass::createObject().
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//
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class SerializableBuilder
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{
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public:
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SerializableBuilder() {}
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virtual ~SerializableBuilder() {}
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// Create the actual Serializable corresponding to the parameter
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// values in this context. This function is overridden in derived
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// classes to call a specific constructor for a particular
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// subclass of Serializable.
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virtual Serializable *create() = 0;
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};
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//
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// An instance of SerializableClass corresponds to a class derived from
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// Serializable. The SerializableClass instance serves to bind the string
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// name (found in the config file) to a function that creates an
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// instance of the appropriate derived class.
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//
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// This would be much cleaner in Smalltalk or Objective-C, where types
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// are first-class objects themselves.
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//
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class SerializableClass
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{
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public:
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// Type CreateFunc is a pointer to a function that creates a new
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// simulation object builder based on a .ini-file parameter
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// section (specified by the first string argument), a unique name
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// for the object (specified by the second string argument), and
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// an optional config hierarchy node (specified by the third
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// argument). A pointer to the new SerializableBuilder is returned.
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typedef Serializable *(*CreateFunc)(CheckpointIn &cp,
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const std::string §ion);
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static std::map<std::string,CreateFunc> *classMap;
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// Constructor. For example:
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//
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// SerializableClass baseCacheSerializableClass("BaseCacheSerializable",
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// newBaseCacheSerializableBuilder);
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//
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SerializableClass(const std::string &className, CreateFunc createFunc);
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// create Serializable given name of class and pointer to
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// configuration hierarchy node
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static Serializable *createObject(CheckpointIn &cp,
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const std::string §ion);
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};
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//
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// Macros to encapsulate the magic of declaring & defining
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// SerializableBuilder and SerializableClass objects
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//
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#define REGISTER_SERIALIZEABLE(CLASS_NAME, OBJ_CLASS) \
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SerializableClass the##OBJ_CLASS##Class(CLASS_NAME, \
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OBJ_CLASS::createForUnserialize);
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// Base class to wrap object resolving functionality. This can be
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// provided to Checkpoint to allow it to map object names onto
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// object C++ objects in which to unserialize
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class SimObjectResolver
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{
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public:
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virtual ~SimObjectResolver() { }
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// Find a SimObject given a full path name
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virtual SimObject *resolveSimObject(const std::string &name) = 0;
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};
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class CheckpointIn
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{
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private:
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IniFile *db;
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SimObjectResolver &objNameResolver;
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public:
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CheckpointIn(const std::string &cpt_dir, SimObjectResolver &resolver);
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~CheckpointIn();
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const std::string cptDir;
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bool find(const std::string §ion, const std::string &entry,
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std::string &value);
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bool findObj(const std::string §ion, const std::string &entry,
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SimObject *&value);
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bool sectionExists(const std::string §ion);
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// The following static functions have to do with checkpoint
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// creation rather than restoration. This class makes a handy
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// namespace for them though. Currently no Checkpoint object is
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// created on serialization (only unserialization) so we track the
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// directory name as a global. It would be nice to change this
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// someday
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private:
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// current directory we're serializing into.
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static std::string currentDirectory;
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public:
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// Set the current directory. This function takes care of
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// inserting curTick() if there's a '%d' in the argument, and
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// appends a '/' if necessary. The final name is returned.
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static std::string setDir(const std::string &base_name);
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// Export current checkpoint directory name so other objects can
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// derive filenames from it (e.g., memory). The return value is
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// guaranteed to end in '/' so filenames can be directly appended.
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// This function is only valid while a checkpoint is being created.
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static std::string dir();
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// Filename for base checkpoint file within directory.
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static const char *baseFilename;
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};
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#endif // __SERIALIZE_HH__
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