src/sim/globals.cc

/*
 * Copyright (c) 2015 ARM Limited
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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2002-2005 The Regents of The University of Michigan
 * Copyright (c) 2013 Advanced Micro Devices, Inc.
 * Copyright (c) 2013 Mark D. Hill and David A. Wood
 * 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
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 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "sim/globals.hh"

#include <set>
#include <string>

#include "base/logging.hh"
#include "sim/cur_tick.hh"

namespace gem5
{

/// The version tags for this build of the simulator, to be stored in the
/// Globals section during serialization and compared upon unserialization.
extern std::set<std::string> version_tags;

void
Globals::serialize(CheckpointOut &cp) const
{
    paramOut(cp, "curTick", curTick());
    SERIALIZE_CONTAINER(version_tags);
}

void
Globals::unserialize(CheckpointIn &cp)
{
    paramIn(cp, "curTick", unserializedCurTick);

    const std::string divider =
        "**********************************************************\n";
    const std::string &section(Serializable::currentSection());
    std::string str;
    if (!cp.find(section, "version_tags", str)) {
        warn(divider);
        warn("!!!! Checkpoint uses an old versioning scheme.        !!!!\n");
        warn("Run the checkpoint upgrader (util/cpt_upgrader.py) on your "
             "checkpoint\n");
        warn(divider);
        return;
    }

    std::set<std::string> cpt_tags;
    arrayParamIn(cp, "version_tags", cpt_tags); // UNSERIALIZE_CONTAINER

    bool err = false;
    for (const auto& t : version_tags) {
        if (cpt_tags.find(t) == cpt_tags.end()) {
            // checkpoint is missing tag that this binary has
            if (!err) {
                warn(divider);
                warn(
                    "!!! Checkpoint is missing the following version tags:\n");
                err = true;
            }
            warn("  %s\n", t);
        }
    }
    if (err) {
        warn("You might experience some issues when restoring and should run "
             "the checkpoint upgrader (util/cpt_upgrader.py) on your "
             "checkpoint\n");
        warn(divider);
    }

    err = false;
    for (const auto& t : cpt_tags) {
        if (version_tags.find(t) == version_tags.end()) {
            // gem5 binary is missing tag that this checkpoint has
            if (!err) {
                warn(divider);
                warn("!!!! gem5 is missing the following version tags:\n");
                err = true;
            }
            warn("  %s\n", t);
        }
    }
    if (err) {
        warn("Running a checkpoint with incompatible version tags is not "
             "supported. While it might work, you may experience incorrect "
             "behavior or crashes.\n");
        warn(divider);
     }
}

} // namespace gem5