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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 "sim/stat_control.hh"
+#include "sim/async.hh"
+#include "sim/eventq.hh"
+#include "sim/host.hh"
+#include "sim/sim_events.hh"
+#include "sim/sim_exit.hh"
+#include "sim/simulate.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.
+ */
+SimLoopExitEvent *
+simulate(Tick num_cycles)
+{
+ warn("Entering event queue @ %d. Starting simulation...\n", curTick);
+
+ if (num_cycles < 0)
+ fatal("simulate: num_cycles must be >= 0 (was %d)\n", num_cycles);
+ else if (curTick + num_cycles < 0) //Overflow
+ num_cycles = MaxTick;
+ else
+ num_cycles = curTick + num_cycles;
+
+ Event *limit_event;
+ limit_event = schedExitSimLoop("simulate() limit reached", 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");
+
+ // forward current cycle to the time of the first event on the
+ // queue
+ curTick = mainEventQueue.nextTick();
+ Event *exit_event = mainEventQueue.serviceOne();
+ if (exit_event != NULL) {
+ // 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->deschedule();
+ delete limit_event;
+ }
+
+ return se_event;
+ }
+
+ if (async_event) {
+ async_event = false;
+ if (async_statdump || async_statreset) {
+ async_statdump = false;
+ async_statreset = false;
+
+ Stats::StatEvent(async_statdump, async_statreset);
+ }
+
+ 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
+}
+