path: root/sim/main.cc

/*
 * Copyright (c) 2000-2004 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.
 */

///
/// @file sim/main.cc
///
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <signal.h>

#include <list>
#include <string>
#include <vector>

#include "base/copyright.hh"
#include "base/embedfile.hh"
#include "base/inifile.hh"
#include "base/misc.hh"
#include "base/pollevent.hh"
#include "base/statistics.hh"
#include "base/str.hh"
#include "base/time.hh"
#include "cpu/base_cpu.hh"
#include "cpu/full_cpu/smt.hh"
#include "sim/async.hh"
#include "sim/builder.hh"
#include "sim/configfile.hh"
#include "sim/host.hh"
#include "sim/sim_events.hh"
#include "sim/sim_exit.hh"
#include "sim/sim_object.hh"
#include "sim/stat_control.hh"
#include "sim/stats.hh"
#include "sim/universe.hh"
#include "sim/pyconfig/pyconfig.hh"

using namespace std;

// See async.h.
volatile bool async_event = false;
volatile bool async_dump = false;
volatile bool async_dumpreset = false;
volatile bool async_exit = false;
volatile bool async_io = false;
volatile bool async_alarm = false;

/// Stats signal handler.
void
dumpStatsHandler(int sigtype)
{
    async_event = true;
    async_dump = true;
}

void
dumprstStatsHandler(int sigtype)
{
    async_event = true;
    async_dumpreset = true;
}

/// Exit signal handler.
void
exitNowHandler(int sigtype)
{
    async_event = true;
    async_exit = true;
}

/// Abort signal handler.
void
abortHandler(int sigtype)
{
    cerr << "Program aborted at cycle " << curTick << endl;

#if TRACING_ON
    // dump trace buffer, if there is one
    Trace::theLog.dump(cerr);
#endif
}

/// Simulator executable name
const char *myProgName = "";

/// Show brief help message.
static void
showBriefHelp(ostream &out)
{
    out << "Usage: " << myProgName
        << " [-hnu] [-Dname[=def]] [-Uname] [-I[dir]] "
        << "<config-spec> [<config-spec> ...]\n"
        << "[] [<config file> ...]\n"
        << "   -h: print long help (including parameter listing)\n"
        << "   -u: don't quit on unreferenced parameters\n"
        << "   -D,-U,-I: passed to cpp for preprocessing .ini files\n"
        << "   <config-spec>: config file name (.ini or .py) or\n"
        << "                  single param (--<section>:<param>=<value>)"
        << endl;
}

/// Show verbose help message.  Includes parameter listing from
/// showBriefHelp(), plus an exhaustive list of ini-file parameters
/// and SimObjects (with their parameters).
static void
showLongHelp(ostream &out)
{
    showBriefHelp(out);

    out << endl
        << endl
        << "-----------------" << endl
        << "Global Parameters" << endl
        << "-----------------" << endl
        << endl;

    ParamContext::describeAllContexts(out);

    out << endl
        << endl
        << "-----------------" << endl
        << "Simulator Objects" << endl
        << "-----------------" << endl
        << endl;

    SimObjectClass::describeAllClasses(out);
}

/// Print welcome message.
static void
sayHello(ostream &out)
{
    extern const char *compileDate;	// from date.cc

    ccprintf(out, "M5 Simulator System\n");
    // display copyright
    ccprintf(out, "%s\n", briefCopyright);
    ccprintf(out, "M5 compiled on %d\n", compileDate);

    char *host = getenv("HOSTNAME");
    if (!host)
        host = getenv("HOST");

    if (host)
        ccprintf(out, "M5 executing on %s\n", host);

    ccprintf(out, "M5 simulation started %s\n", Time::start);
}

///
/// Echo the command line for posterity in such a way that it can be
/// used to rerun the same simulation (given the same .ini files).
///
static void
echoCommandLine(int argc, char **argv, ostream &out)
{
    out << "command line: " << argv[0];
    for (int i = 1; i < argc; i++) {
        string arg(argv[i]);

        out << ' ';

        // If the arg contains spaces, we need to quote it.
        // The rest of this is overkill to make it look purty.

        // print dashes first outside quotes
        int non_dash_pos = arg.find_first_not_of("-");
        out << arg.substr(0, non_dash_pos);	// print dashes
        string body = arg.substr(non_dash_pos);	// the rest

        // if it's an assignment, handle the lhs & rhs separately
        int eq_pos = body.find("=");
        if (eq_pos == string::npos) {
            out << quote(body);
        }
        else {
            string lhs(body.substr(0, eq_pos));
            string rhs(body.substr(eq_pos + 1));

            out << quote(lhs) << "=" << quote(rhs);
        }
    }
    out << endl << endl;
}


///
/// The simulator configuration database.  This is the union of all
/// specified .ini files.  This shouldn't need to be visible outside
/// this file, as it is passed as a parameter to all the param-parsing
/// routines.
///
static IniFile simConfigDB;

/// M5 entry point.
int
main(int argc, char **argv)
{
    // Save off program name
    myProgName = argv[0];

    signal(SIGFPE, SIG_IGN);		// may occur on misspeculated paths
    signal(SIGTRAP, SIG_IGN);
    signal(SIGUSR1, dumpStatsHandler);		// dump intermediate stats
    signal(SIGUSR2, dumprstStatsHandler);	// dump and reset stats
    signal(SIGINT, exitNowHandler);		// dump final stats and exit
    signal(SIGABRT, abortHandler);

    sayHello(cerr);

    // Initialize statistics database
    Stats::InitSimStats();

    vector<char *> cppArgs;

    // Should we quit if there are unreferenced parameters?  By
    // default, yes... it's a good way of catching typos in
    // section/parameter names (which otherwise go by silently).  Use
    // -u to override.
    bool quitOnUnreferenced = true;

    bool python_initialized = false;

    // Parse command-line options.
    // Since most of the complex options are handled through the
    // config database, we don't mess with getopts, and just parse
    // manually.
    for (int i = 1; i < argc; ++i) {
        char *arg_str = argv[i];

        // if arg starts with '-', parse as option,
        // else treat it as a configuration file name and load it
        if (arg_str[0] == '-') {

            // switch on second char
            switch (arg_str[1]) {
              case 'X': {
                  list<EmbedFile> lst;
                  EmbedMap::all(lst);
                  list<EmbedFile>::iterator i = lst.begin();
                  list<EmbedFile>::iterator end = lst.end();

                  while (i != end) {
                      cprintf("Embedded File: %s\n", i->name);
                      cout.write(i->data, i->length);
                      ++i;
                  }

                  return 0;
              }

              case 'h':
                // -h: show help
                showLongHelp(cerr);
                exit(1);

              case 'u':
                // -u: don't quit on unreferenced parameters
                quitOnUnreferenced = false;
                break;

              case 'D':
              case 'U':
                // cpp options: record & pass to cpp.  Note that these
                // cannot have spaces, i.e., '-Dname=val' is OK, but
                // '-D name=val' is not.  I don't consider this a
                // problem, since even though gnu cpp accepts the
                // latter, other cpp implementations do not (Tru64,
                // for one).
                cppArgs.push_back(arg_str);
                break;

              case 'I': {
                  // We push -I as an argument to cpp
                  cppArgs.push_back(arg_str);

                  string arg = arg_str + 2;
                  eat_white(arg);

                  // Send this as the python path
                  addPythonPath(arg);
              } break;

              case 'P':
                if (!python_initialized) {
                    initPythonConfig();
                    python_initialized = true;
                }
                writePythonString(arg_str + 2);
                writePythonString("\n");

              case 'E':
                if (putenv(arg_str + 2) == -1)
                    panic("putenv: %s\n", strerror(errno));
                break;

              case '-':
                // command-line configuration parameter:
                // '--<section>:<parameter>=<value>'
                if (!simConfigDB.add(arg_str + 2)) {
                    // parse error
                    ccprintf(cerr,
                             "Could not parse configuration argument '%s'\n"
                             "Expecting --<section>:<parameter>=<value>\n",
                             arg_str);
                    exit(0);
                }
                break;

              default:
                showBriefHelp(cerr);
                ccprintf(cerr, "Fatal: invalid argument '%s'\n", arg_str);
                exit(0);
            }
        }
        else {
            // no '-', treat as config file name

            // make STL string out of file name
            string filename(arg_str);

            int ext_loc = filename.rfind(".");

            string ext =
                (ext_loc != string::npos) ? filename.substr(ext_loc) : "";

            if (ext == ".ini") {
                if (!simConfigDB.loadCPP(filename, cppArgs)) {
                    cprintf("Error processing file %s\n", filename);
                    exit(1);
                }
            } else if (ext == ".py" || ext == ".mpy") {
                if (!python_initialized) {
                    initPythonConfig();
                    python_initialized = true;
                }
                loadPythonConfig(filename);
            }
            else {
                cprintf("Config file name '%s' must end in '.py' or '.ini'.\n",
                        filename);
                exit(1);
            }
        }
    }

    if (python_initialized && finishPythonConfig(simConfigDB)) {
        cprintf("Error processing python code\n");
        exit(1);
    }

    // The configuration database is now complete; start processing it.

    // Parse and check all non-config-hierarchy parameters.
    ParamContext::parseAllContexts(simConfigDB);
    ParamContext::checkAllContexts();

    // Print header info into stats file.  Can't do this sooner since
    // the stat file name is set via a .ini param... thus it just got
    // opened above during ParamContext::checkAllContexts().

    // Now process the configuration hierarchy and create the SimObjects.
    ConfigHierarchy configHierarchy(simConfigDB);
    configHierarchy.build();
    configHierarchy.createSimObjects();

    // Print hello message to stats file if it's actually a file.  If
    // it's not (i.e. it's cout or cerr) then we already did it above.
    if (outputStream != &cout && outputStream != &cerr)
        sayHello(*outputStream);

    // Echo command line and all parameter settings to stats file as well.
    echoCommandLine(argc, argv, *outputStream);
    ParamContext::showAllContexts(*configStream);

    // Do a second pass to finish initializing the sim objects
    SimObject::initAll();

    // Restore checkpointed state, if any.
    configHierarchy.unserializeSimObjects();

    // Done processing the configuration database.
    // Check for unreferenced entries.
    if (simConfigDB.printUnreferenced() && quitOnUnreferenced) {
        cerr << "Fatal: unreferenced .ini sections/entries." << endl
             << "If this is not an error, add 'unref_section_ok=y' or "
             << "'unref_entries_ok=y' to the appropriate sections "
             << "to suppress this message." << endl;
        exit(1);
    }

    SimObject::regAllStats();

    // uncomment the following to get PC-based execution-time profile
#ifdef DO_PROFILE
    init_profile((char *)&_init, (char *)&_fini);
#endif

    // Check to make sure that the stats package is properly initialized
    Stats::check();

    // Reset to put the stats in a consistent state.
    Stats::reset();

    // Nothing to simulate if we don't have at least one CPU somewhere.
    if (BaseCPU::numSimulatedCPUs() == 0) {
        cerr << "Fatal: no CPUs to simulate." << endl;
        exit(1);
    }

    warn("Entering event queue.  Starting simulation...\n");
    SimStartup();
    while (!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();
        mainEventQueue.serviceOne();

        if (async_event) {
            async_event = false;
            if (async_dump) {
                async_dump = false;

                using namespace Stats;
                SetupEvent(Dump, curTick);
            }

            if (async_dumpreset) {
                async_dumpreset = false;

                using namespace Stats;
                SetupEvent(Dump | Reset, curTick);
            }

            if (async_exit) {
                async_exit = false;
                new SimExitEvent("User requested STOP");
            }

            if (async_io || async_alarm) {
                async_io = false;
                async_alarm = false;
                pollQueue.service();
            }
        }
    }

    // This should never happen... every conceivable way for the
    // simulation to terminate (hit max cycles/insts, signal,
    // simulated system halts/exits) generates an exit event, so we
    // should never run out of events on the queue.
    exitNow("no events on event loop!  All CPUs must be idle.", 1);

    return 0;
}