76cd4393c0
Objects that are can be serialized are supposed to inherit from the
Serializable class. This class is meant to provide a unified API for
such objects. However, so far it has mainly been used by SimObjects
due to some fundamental design limitations. This changeset redesigns
to the serialization interface to make it more generic and hide the
underlying checkpoint storage. Specifically:
* Add a set of APIs to serialize into a subsection of the current
object. Previously, objects that needed this functionality would
use ad-hoc solutions using nameOut() and section name
generation. In the new world, an object that implements the
interface has the methods serializeSection() and
unserializeSection() that serialize into a named /subsection/ of
the current object. Calling serialize() serializes an object into
the current section.
* Move the name() method from Serializable to SimObject as it is no
longer needed for serialization. The fully qualified section name
is generated by the main serialization code on the fly as objects
serialize sub-objects.
* Add a scoped ScopedCheckpointSection helper class. Some objects
need to serialize data structures, that are not deriving from
Serializable, into subsections. Previously, this was done using
nameOut() and manual section name generation. To simplify this,
this changeset introduces a ScopedCheckpointSection() helper
class. When this class is instantiated, it adds a new /subsection/
and subsequent serialization calls during the lifetime of this
helper class happen inside this section (or a subsection in case
of nested sections).
* The serialize() call is now const which prevents accidental state
manipulation during serialization. Objects that rely on modifying
state can use the serializeOld() call instead. The default
implementation simply calls serialize(). Note: The old-style calls
need to be explicitly called using the
serializeOld()/serializeSectionOld() style APIs. These are used by
default when serializing SimObjects.
* Both the input and output checkpoints now use their own named
types. This hides underlying checkpoint implementation from
objects that need checkpointing and makes it easier to change the
underlying checkpoint storage code.
137 lines
3.7 KiB
C++
137 lines
3.7 KiB
C++
/*
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* Copyright (c) 2003-2005 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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*/
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/* @file
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* Interface to connect a simulated ethernet device to the real world
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*/
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#ifndef __ETHERTAP_HH__
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#define __ETHERTAP_HH__
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#include <queue>
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#include <string>
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#include "base/pollevent.hh"
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#include "dev/etherint.hh"
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#include "dev/etherobject.hh"
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#include "dev/etherpkt.hh"
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#include "params/EtherTap.hh"
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#include "sim/eventq.hh"
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#include "sim/sim_object.hh"
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class TapEvent;
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class TapListener;
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class EtherTapInt;
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/*
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* Interface to connect a simulated ethernet device to the real world
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*/
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class EtherTap : public EtherObject
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{
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protected:
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friend class TapEvent;
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TapEvent *event;
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protected:
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friend class TapListener;
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TapListener *listener;
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int socket;
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char *buffer;
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int buflen;
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uint32_t buffer_offset;
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uint32_t data_len;
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EtherDump *dump;
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void attach(int fd);
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void detach();
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protected:
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std::string device;
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std::queue<EthPacketPtr> packetBuffer;
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EtherTapInt *interface;
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void process(int revent);
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void enqueue(EthPacketData *packet);
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void retransmit();
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/*
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*/
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class TxEvent : public Event
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{
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protected:
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EtherTap *tap;
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public:
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TxEvent(EtherTap *_tap) : tap(_tap) {}
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void process() { tap->retransmit(); }
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virtual const char *description() const
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{ return "EtherTap retransmit"; }
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};
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friend class TxEvent;
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TxEvent txEvent;
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public:
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typedef EtherTapParams Params;
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EtherTap(const Params *p);
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virtual ~EtherTap();
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const Params *
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params() const
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{
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return dynamic_cast<const Params *>(_params);
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}
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virtual EtherInt *getEthPort(const std::string &if_name, int idx);
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virtual bool recvPacket(EthPacketPtr packet);
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virtual void sendDone();
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void serialize(CheckpointOut &cp) const M5_ATTR_OVERRIDE;
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void unserialize(CheckpointIn &cp) M5_ATTR_OVERRIDE;
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};
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class EtherTapInt : public EtherInt
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{
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private:
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EtherTap *tap;
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public:
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EtherTapInt(const std::string &name, EtherTap *t)
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: EtherInt(name), tap(t)
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{ }
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virtual bool recvPacket(EthPacketPtr pkt) { return tap->recvPacket(pkt); }
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virtual void sendDone() { tap->sendDone(); }
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};
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#endif // __ETHERTAP_HH__
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