gem5/sim/sim_events.cc
Nathan Binkert 78ae8764a9 add a new phase to the simulator. Basically the simulator now goes
through the following phases.

1) Construct all param contexts
2) Call the checkParams() on each context
3) Build the configuration hierarchy
4) Construct all SimObjects
5) Initialize all SimObjects by calling init() on each one
6) Unserialize the checkpoint
7) Register all statisitcs
8) Check validity of all statistics (after that, no new stats)
9) Reset all stats.
10) Call SimStartup() which calls startup() on all SimObjects,
ParamContexts, and any other object deriving from StartupCallback

SConscript:
    no more SimInit() we have SimStartup() now
sim/param.hh:
    Make all params have a startup callback.
sim/sim_events.cc:
    the init callbacks no longer exist.  We can simplify code by
    using startup().
sim/sim_object.hh:
    Make all SimObjects derive from StartupCallback

--HG--
extra : convert_revision : ab81e259eb5510cc597f7bacb2bfb619fb4cc15f
2004-11-03 11:47:55 -05:00

230 lines
5.7 KiB
C++

/*
* Copyright (c) 2002-2004 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.
*/
#include <string>
#include "base/callback.hh"
#include "base/hostinfo.hh"
#include "sim/eventq.hh"
#include "sim/param.hh"
#include "sim/sim_events.hh"
#include "sim/sim_exit.hh"
#include "sim/startup.hh"
#include "sim/stats.hh"
using namespace std;
//
// handle termination event
//
void
SimExitEvent::process()
{
// This event does not autodelete because exitNow may be called,
// and the function will never be allowed to finish.
if (theQueue() == &mainEventQueue) {
string _cause = cause;
int _code = code;
delete this;
exitNow(_cause, _code);
} else {
new SimExitEvent(cause, code);
delete this;
}
}
const char *
SimExitEvent::description()
{
return "simulation termination";
}
//
// constructor: automatically schedules at specified time
//
CountedExitEvent::CountedExitEvent(EventQueue *q, const std::string &_cause,
Tick _when, int &_downCounter)
: Event(q, Sim_Exit_Pri),
cause(_cause),
downCounter(_downCounter)
{
// catch stupid mistakes
assert(downCounter > 0);
schedule(_when);
}
//
// handle termination event
//
void
CountedExitEvent::process()
{
if (--downCounter == 0) {
new SimExitEvent(cause, 0);
}
}
const char *
CountedExitEvent::description()
{
return "counted exit";
}
#ifdef CHECK_SWAP_CYCLES
new CheckSwapEvent(&mainEventQueue, CHECK_SWAP_CYCLES);
#endif
void
CheckSwapEvent::process()
{
/* Check the amount of free swap space */
long swap;
/* returns free swap in KBytes */
swap = procInfo("/proc/meminfo", "SwapFree:");
if (swap < 1000)
ccprintf(cerr, "\a\a\aWarning! Swap space is low (%d)\n", swap);
if (swap < 100) {
cerr << "\a\aAborting Simulation! Inadequate swap space!\n\n";
new SimExitEvent("Lack of swap space");
}
schedule(curTick + interval);
}
const char *
CheckSwapEvent::description()
{
return "check swap";
}
///////////////////////////////////////////////////
//
// Simulation termination parameters
//
///////////////////////////////////////////////////
class TermParamContext : public ParamContext
{
public:
TermParamContext(const string &_iniSection)
: ParamContext(_iniSection) {}
void checkParams();
};
TermParamContext simTerminationParams("max");
Param<Tick> max_cycle(&simTerminationParams, "cycle",
"maximum number of cycles to execute");
void
TermParamContext::checkParams()
{
// if a max cycle count was specified, put a termination event on
// the event queue at that point
if (max_cycle.isValid())
new SimExitEvent(max_cycle, "reached maximum cycle count");
}
//
// Progress event: print out cycle every so often so we know we're
// making forward progress.
//
class ProgressEvent : public Event
{
protected:
Tick interval;
public:
ProgressEvent(EventQueue *q, Tick interval);
void process(); // process event
virtual const char *description();
};
//
// constructor: schedule at specified time
//
ProgressEvent::ProgressEvent(EventQueue *q, Tick _interval)
: Event(q), interval(_interval)
{
schedule(curTick + interval);
}
//
// handle progress event: print message and reschedule
//
void
ProgressEvent::process()
{
DPRINTFN("ProgressEvent\n");
// reschedule for next interval
schedule(curTick + interval);
}
const char *
ProgressEvent::description()
{
return "progress message";
}
/////////
//
// Periodic progress message support: print out a message every n
// cycles so we know we're making forward progress.
//
/////////
// Parameter space for execution address tracing options. Derive
// from ParamContext so we can override checkParams() function.
struct ProgressParamContext : public ParamContext
{
ProgressParamContext(const string &_iniSection)
: ParamContext(_iniSection) {}
void startup();
};
ProgressParamContext progessMessageParams("progress");
Param<Tick> progress_interval(&progessMessageParams, "cycle",
"cycle interval for progress messages");
void
ProgressParamContext::startup()
{
if (progress_interval.isValid())
new ProgressEvent(&mainEventQueue, progress_interval);
}