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/*
* Copyright (c) 2006 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.
*
* Authors: Nathan Binkert
* Steve Reinhardt
*/
#include "base/misc.hh"
#include "base/pollevent.hh"
#include "base/types.hh"
#include "sim/async.hh"
#include "sim/eventq_impl.hh"
#include "sim/sim_events.hh"
#include "sim/sim_exit.hh"
#include "sim/simulate.hh"
#include "sim/stat_control.hh"
/** Simulate for num_cycles additional cycles. If num_cycles is -1
* (the default), do not limit simulation; some other event must
* terminate the loop. Exported to Python via SWIG.
* @return The SimLoopExitEvent that caused the loop to exit.
*/
// record the clock cycle for last exit event
Tick lastExitTick = 0;
SimLoopExitEvent *
simulate(Tick num_cycles)
{
inform("Entering event queue @ %d. Starting simulation...\n", curTick());
if (num_cycles < MaxTick - curTick())
num_cycles = curTick() + num_cycles;
else // counter would roll over or be set to MaxTick anyhow
num_cycles = MaxTick;
Event *limit_event =
new SimLoopExitEvent("simulate() limit reached", 0);
mainEventQueue.schedule(limit_event, num_cycles);
while (1) {
// there should always be at least one event (the SimLoopExitEvent
// we just scheduled) in the queue
assert(!mainEventQueue.empty());
assert(curTick() <= mainEventQueue.nextTick() &&
"event scheduled in the past");
Event *exit_event = mainEventQueue.serviceOne();
if (exit_event != NULL) {
/*
* if there are multiple exit events in the same cycle, drain the
* following exit events since gem5 only allows one * exit event in
* a cycle
*/
if (lastExitTick == curTick())
continue;
else
lastExitTick = curTick();
// hit some kind of exit event; return to Python
// event must be subclass of SimLoopExitEvent...
SimLoopExitEvent *se_event;
se_event = dynamic_cast<SimLoopExitEvent *>(exit_event);
if (se_event == NULL)
panic("Bogus exit event class!");
// if we didn't hit limit_event, delete it
if (se_event != limit_event) {
assert(limit_event->scheduled());
limit_event->squash();
hack_once("be nice to actually delete the event here");
}
return se_event;
}
if (async_event) {
async_event = false;
if (async_statdump || async_statreset) {
Stats::schedStatEvent(async_statdump, async_statreset);
async_statdump = false;
async_statreset = false;
}
if (async_exit) {
async_exit = false;
exitSimLoop("user interrupt received");
}
if (async_io || async_alarm) {
async_io = false;
async_alarm = false;
pollQueue.service();
}
if (async_exception) {
async_exception = false;
return NULL;
}
}
}
// not reached... only exit is return on SimLoopExitEvent
}
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