summaryrefslogtreecommitdiff
path: root/src/sim/main.cc
blob: f3b74489d57e9f8ff0e18cd6947a1d6bdfcfa9d9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
/*
 * Copyright (c) 2000-2005 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: Steve Raasch
 *          Nathan Binkert
 *          Steve Reinhardt
 */

///
/// @file sim/main.cc
///
#include <Python.h>	// must be before system headers... see Python docs

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <libgen.h>
#include <stdlib.h>
#include <signal.h>
#include <getopt.h>

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

#include "base/callback.hh"
#include "base/inifile.hh"
#include "base/misc.hh"
#include "base/output.hh"
#include "base/pollevent.hh"
#include "base/statistics.hh"
#include "base/str.hh"
#include "base/time.hh"
#include "cpu/base.hh"
#include "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/root.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
char *myProgName = "";

/// Show brief help message.
void
showBriefHelp(ostream &out)
{
    char *prog = basename(myProgName);

    ccprintf(out, "Usage:\n");
    ccprintf(out,
"%s [-p <path>] [-i ] [-h] <config file>\n"
"\n"
" -p, --path <path>  prepends <path> to PYTHONPATH instead of using\n"
"                    built-in zip archive.  Useful when developing/debugging\n"
"                    changes to built-in Python libraries, as the new Python\n"
"                    can be tested without building a new m5 binary.\n\n"
" -i, --interactive  forces entry into interactive mode after the supplied\n"
"                    script is executed (just like the -i option to  the\n"
"                    Python interpreter).\n\n"
" -h                 Prints this help\n\n"
" <configfile>       config file name (ends in .py)\n\n",
             prog);

}

const char *briefCopyright =
"Copyright (c) 2001-2006\n"
"The Regents of The University of Michigan\n"
"All Rights Reserved\n";

/// Print welcome message.
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 %d\n", compileDate);
    ccprintf(out, "M5 started %s\n", Time::start);

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

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


extern "C" { void init_main(); }

int
main(int argc, char **argv)
{
    // Saze off program name
    myProgName = argv[0];

    sayHello(cerr);

    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);

    Py_SetProgramName(argv[0]);

    // default path to m5 python code is the currently executing
    // file... Python ZipImporter will find embedded zip archive
    char *pythonpath = argv[0];

    bool interactive = false;
    bool show_help = false;
    bool getopt_done = false;
    int opt_index = 0;

    static struct option long_options[] = {
        {"python", 1, 0, 'p'},
        {"interactive", 0, 0, 'i'},
        {"help", 0, 0, 'h'},
        {0,0,0,0}
    };

    do {
        switch (getopt_long(argc, argv, "+p:ih", long_options, &opt_index)) {
            // -p <path> prepends <path> to PYTHONPATH instead of
            // using built-in zip archive.  Useful when
            // developing/debugging changes to built-in Python
            // libraries, as the new Python can be tested without
            // building a new m5 binary.
          case 'p':
            pythonpath = optarg;
            break;

            // -i forces entry into interactive mode after the
            // supplied script is executed (just like the -i option to
            // the Python interpreter).
          case 'i':
            interactive = true;
            break;

          case 'h':
            show_help = true;
            break;
          case -1:
            getopt_done = true;
            break;

          default:
            fatal("Unrecognized option %c\n", optopt);
        }
    } while (!getopt_done);

    if (show_help) {
        showBriefHelp(cerr);
        exit(1);
    }

    // Fix up argc & argv to hide arguments we just processed.
    // getopt() sets optind to the index of the first non-processed
    // argv element.
    argc -= optind;
    argv += optind;

    // Set up PYTHONPATH to make sure the m5 module is found
    string newpath(pythonpath);

    char *oldpath = getenv("PYTHONPATH");
    if (oldpath != NULL) {
        newpath += ":";
        newpath += oldpath;
    }

    if (setenv("PYTHONPATH", newpath.c_str(), true) == -1)
        fatal("setenv: %s\n", strerror(errno));

    // initialize embedded Python interpreter
    Py_Initialize();
    PySys_SetArgv(argc, argv);

    // initialize SWIG 'main' module
    init_main();

    if (argc > 0) {
        // extra arg(s): first is script file, remaining ones are args
        // to script file
        char *filename = argv[0];
        FILE *fp = fopen(filename, "r");
        if (!fp) {
            fatal("cannot open file '%s'\n", filename);
        }

        PyRun_AnyFile(fp, filename);
    } else {
        // no script file argument... force interactive prompt
        interactive = true;
    }

    if (interactive) {
        // The following code to import readline was copied from Python
        // 2.4.3's Modules/main.c.
        // Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006
        // Python Software Foundation; All Rights Reserved
        // We should only enable this if we're actually using an
        // interactive prompt.
        PyObject *v;
        v = PyImport_ImportModule("readline");
        if (v == NULL)
            PyErr_Clear();
        else
            Py_DECREF(v);

        PyRun_InteractiveLoop(stdin, "stdin");
    }

    // clean up Python intepreter.
    Py_Finalize();
}


/// Initialize C++ configuration.  Exported to Python via SWIG; invoked
/// from m5.instantiate().
void
initialize()
{
    configStream = simout.find("config.out");

    // The configuration database is now complete; start processing it.
    IniFile inifile;
    inifile.load("config.ini");

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

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

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

    // Echo all parameter settings to stats file as well.
    ParamContext::showAllContexts(*configStream);

    // Any objects that can't connect themselves until after construction should
    // do so now
    SimObject::connectAll();

    // 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 (inifile.printUnreferenced())
        panic("unreferenced sections/entries in the intermediate ini file");

    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();

    SimStartup();
}


/** 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 = -1)
{
    warn("Entering event queue @ %d.  Starting simulation...\n", curTick);

    // Fix up num_cycles.  Special default value -1 means simulate
    // "forever"... schedule event at MaxTick just to be safe.
    // Otherwise it's a delta for additional cycles to simulate past
    // curTick, and thus must be non-negative.
    if (num_cycles == -1)
        num_cycles = MaxTick;
    else if (num_cycles < 0)
        fatal("simulate: num_cycles must be >= 0 (was %d)\n", num_cycles);
    else
        num_cycles = curTick + num_cycles;

    Event *limit_event = new SimLoopExitEvent(num_cycles,
                                              "simulate() limit reached");

    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 = 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_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;
                exitSimLoop("user interrupt received");
            }

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

    // not reached... only exit is return on SimLoopExitEvent
}

/**
 * Queue of C++ callbacks to invoke on simulator exit.
 */
CallbackQueue exitCallbacks;

/**
 * Register an exit callback.
 */
void
registerExitCallback(Callback *callback)
{
    exitCallbacks.add(callback);
}

/**
 * Do C++ simulator exit processing.  Exported to SWIG to be invoked
 * when simulator terminates via Python's atexit mechanism.
 */
void
doExitCleanup()
{
    exitCallbacks.process();
    exitCallbacks.clear();

    cout.flush();

    ParamContext::cleanupAllContexts();

    // print simulation stats
    Stats::DumpNow();
}