2ac04c11ac
This patch adds explicit overrides as this is now required when using "-Wall" with clang >= 3.5, the latter now part of the most recent XCode. The patch consequently removes "virtual" for those methods where "override" is added. The latter should be enough of an indication. As part of this patch, a few minor issues that clang >= 3.5 complains about are also resolved (unused methods and variables).
120 lines
4 KiB
C++
120 lines
4 KiB
C++
/*
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* Copyright (c) 2011 Advanced Micro Devices, Inc.
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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: Gabe Black
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*/
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/**
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* @file This file defines the Root simobject and the methods used to control
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* the time syncing mechanism provided through it.
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*
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* Time syncing prevents simulated time from passing faster than real time. It
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* works by scheduling a periodic event that checks to see if its simulated
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* period is shorter than its real period. If it is, it stalls the simulation
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* until they're equal.
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*/
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#ifndef __SIM_ROOT_HH__
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#define __SIM_ROOT_HH__
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#include "base/time.hh"
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#include "params/Root.hh"
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#include "sim/eventq.hh"
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#include "sim/sim_object.hh"
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class Root : public SimObject
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{
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private:
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static Root *_root;
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protected:
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bool _enabled;
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Time _period;
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Tick _periodTick;
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Time _spinThreshold;
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Time lastTime;
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void timeSync();
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EventWrapper<Root, &Root::timeSync> syncEvent;
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friend class EventWrapper<Root, &Root::timeSync>;
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public:
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/**
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* Use this function to get a pointer to the single Root object in the
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* simulation. This function asserts that such an object has actual been
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* constructed to avoid having to perform that check everywhere the root
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* is used. This is to allow calling the functions below.
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*
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* @return Pointer to the single root object.
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*/
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static Root *
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root()
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{
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assert(_root);
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return _root;
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}
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public:
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/// Check whether time syncing is enabled.
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bool timeSyncEnabled() const { return _enabled; }
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/// Retrieve the period for the sync event.
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const Time timeSyncPeriod() const { return _period; }
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/// Retrieve the threshold for time remaining to spin wait.
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const Time timeSyncSpinThreshold() const { return _spinThreshold; }
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/// Enable or disable time syncing.
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void timeSyncEnable(bool en);
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/// Configure the period for time sync events.
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void timeSyncPeriod(Time newPeriod);
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/// Set the threshold for time remaining to spin wait.
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void timeSyncSpinThreshold(Time newThreshold);
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typedef RootParams Params;
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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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Root(Params *p);
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/** Schedule the timesync event at loadState() so that curTick is correct
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*/
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void loadState(CheckpointIn &cp) override;
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/** Schedule the timesync event at initState() when not unserializing
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*/
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void initState() override;
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void serialize(CheckpointOut &cp) const override;
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void unserialize(CheckpointIn &cp) override;
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};
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#endif // __SIM_ROOT_HH__
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