summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/trace-event-perl.c
blob: 5b49df067df0de494acb844a488e7d900d07b005 (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
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
/*
 * trace-event-perl.  Feed perf trace events to an embedded Perl interpreter.
 *
 * Copyright (C) 2009 Tom Zanussi <tzanussi@gmail.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#include "../perf.h"
#include "util.h"
#include "trace-event.h"
#include "trace-event-perl.h"

void xs_init(pTHX);

void xs_init(pTHX)
{
	const char *file = __FILE__;
	dXSUB_SYS;

	newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
	      file);
	newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
}

INTERP my_perl;

#define FTRACE_MAX_EVENT				\
	((1 << (sizeof(unsigned short) * 8)) - 1)

struct event *events[FTRACE_MAX_EVENT];

static struct scripting_context *scripting_context;

static char *cur_field_name;
static int zero_flag_atom;

static void define_symbolic_value(const char *ev_name,
				  const char *field_name,
				  const char *field_value,
				  const char *field_str)
{
	unsigned long long value;
	dSP;

	value = eval_flag(field_value);

	ENTER;
	SAVETMPS;
	PUSHMARK(SP);

	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
	XPUSHs(sv_2mortal(newSVuv(value)));
	XPUSHs(sv_2mortal(newSVpv(field_str, 0)));

	PUTBACK;
	if (get_cv("main::define_symbolic_value", 0))
		call_pv("main::define_symbolic_value", G_SCALAR);
	SPAGAIN;
	PUTBACK;
	FREETMPS;
	LEAVE;
}

static void define_symbolic_values(struct print_flag_sym *field,
				   const char *ev_name,
				   const char *field_name)
{
	define_symbolic_value(ev_name, field_name, field->value, field->str);
	if (field->next)
		define_symbolic_values(field->next, ev_name, field_name);
}

static void define_symbolic_field(const char *ev_name,
				  const char *field_name)
{
	dSP;

	ENTER;
	SAVETMPS;
	PUSHMARK(SP);

	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));

	PUTBACK;
	if (get_cv("main::define_symbolic_field", 0))
		call_pv("main::define_symbolic_field", G_SCALAR);
	SPAGAIN;
	PUTBACK;
	FREETMPS;
	LEAVE;
}

static void define_flag_value(const char *ev_name,
			      const char *field_name,
			      const char *field_value,
			      const char *field_str)
{
	unsigned long long value;
	dSP;

	value = eval_flag(field_value);

	ENTER;
	SAVETMPS;
	PUSHMARK(SP);

	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
	XPUSHs(sv_2mortal(newSVuv(value)));
	XPUSHs(sv_2mortal(newSVpv(field_str, 0)));

	PUTBACK;
	if (get_cv("main::define_flag_value", 0))
		call_pv("main::define_flag_value", G_SCALAR);
	SPAGAIN;
	PUTBACK;
	FREETMPS;
	LEAVE;
}

static void define_flag_values(struct print_flag_sym *field,
			       const char *ev_name,
			       const char *field_name)
{
	define_flag_value(ev_name, field_name, field->value, field->str);
	if (field->next)
		define_flag_values(field->next, ev_name, field_name);
}

static void define_flag_field(const char *ev_name,
			      const char *field_name,
			      const char *delim)
{
	dSP;

	ENTER;
	SAVETMPS;
	PUSHMARK(SP);

	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
	XPUSHs(sv_2mortal(newSVpv(delim, 0)));

	PUTBACK;
	if (get_cv("main::define_flag_field", 0))
		call_pv("main::define_flag_field", G_SCALAR);
	SPAGAIN;
	PUTBACK;
	FREETMPS;
	LEAVE;
}

static void define_event_symbols(struct event *event,
				 const char *ev_name,
				 struct print_arg *args)
{
	switch (args->type) {
	case PRINT_NULL:
		break;
	case PRINT_ATOM:
		define_flag_value(ev_name, cur_field_name, "0",
				  args->atom.atom);
		zero_flag_atom = 0;
		break;
	case PRINT_FIELD:
		if (cur_field_name)
			free(cur_field_name);
		cur_field_name = strdup(args->field.name);
		break;
	case PRINT_FLAGS:
		define_event_symbols(event, ev_name, args->flags.field);
		define_flag_field(ev_name, cur_field_name, args->flags.delim);
		define_flag_values(args->flags.flags, ev_name, cur_field_name);
		break;
	case PRINT_SYMBOL:
		define_event_symbols(event, ev_name, args->symbol.field);
		define_symbolic_field(ev_name, cur_field_name);
		define_symbolic_values(args->symbol.symbols, ev_name,
				       cur_field_name);
		break;
	case PRINT_STRING:
		break;
	case PRINT_TYPE:
		define_event_symbols(event, ev_name, args->typecast.item);
		break;
	case PRINT_OP:
		if (strcmp(args->op.op, ":") == 0)
			zero_flag_atom = 1;
		define_event_symbols(event, ev_name, args->op.left);
		define_event_symbols(event, ev_name, args->op.right);
		break;
	default:
		/* we should warn... */
		return;
	}

	if (args->next)
		define_event_symbols(event, ev_name, args->next);
}

static inline struct event *find_cache_event(int type)
{
	static char ev_name[256];
	struct event *event;

	if (events[type])
		return events[type];

	events[type] = event = trace_find_event(type);
	if (!event)
		return NULL;

	sprintf(ev_name, "%s::%s", event->system, event->name);

	define_event_symbols(event, ev_name, event->print_fmt.args);

	return event;
}

static void perl_process_event(int cpu, void *data,
			       int size __unused,
			       unsigned long long nsecs, char *comm)
{
	struct format_field *field;
	static char handler[256];
	unsigned long long val;
	unsigned long s, ns;
	struct event *event;
	int type;
	int pid;

	dSP;

	type = trace_parse_common_type(data);

	event = find_cache_event(type);
	if (!event)
		die("ug! no event found for type %d", type);

	pid = trace_parse_common_pid(data);

	sprintf(handler, "%s::%s", event->system, event->name);

	s = nsecs / NSECS_PER_SEC;
	ns = nsecs - s * NSECS_PER_SEC;

	scripting_context->event_data = data;

	ENTER;
	SAVETMPS;
	PUSHMARK(SP);

	XPUSHs(sv_2mortal(newSVpv(handler, 0)));
	XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
	XPUSHs(sv_2mortal(newSVuv(cpu)));
	XPUSHs(sv_2mortal(newSVuv(s)));
	XPUSHs(sv_2mortal(newSVuv(ns)));
	XPUSHs(sv_2mortal(newSViv(pid)));
	XPUSHs(sv_2mortal(newSVpv(comm, 0)));

	/* common fields other than pid can be accessed via xsub fns */

	for (field = event->format.fields; field; field = field->next) {
		if (field->flags & FIELD_IS_STRING) {
			int offset;
			if (field->flags & FIELD_IS_DYNAMIC) {
				offset = *(int *)(data + field->offset);
				offset &= 0xffff;
			} else
				offset = field->offset;
			XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
		} else { /* FIELD_IS_NUMERIC */
			val = read_size(data + field->offset, field->size);
			if (field->flags & FIELD_IS_SIGNED) {
				XPUSHs(sv_2mortal(newSViv(val)));
			} else {
				XPUSHs(sv_2mortal(newSVuv(val)));
			}
		}
	}

	PUTBACK;

	if (get_cv(handler, 0))
		call_pv(handler, G_SCALAR);
	else if (get_cv("main::trace_unhandled", 0)) {
		XPUSHs(sv_2mortal(newSVpv(handler, 0)));
		XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
		XPUSHs(sv_2mortal(newSVuv(cpu)));
		XPUSHs(sv_2mortal(newSVuv(nsecs)));
		XPUSHs(sv_2mortal(newSViv(pid)));
		XPUSHs(sv_2mortal(newSVpv(comm, 0)));
		call_pv("main::trace_unhandled", G_SCALAR);
	}
	SPAGAIN;
	PUTBACK;
	FREETMPS;
	LEAVE;
}

static void run_start_sub(void)
{
	dSP; /* access to Perl stack */
	PUSHMARK(SP);

	if (get_cv("main::trace_begin", 0))
		call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
}

/*
 * Start trace script
 */
static int perl_start_script(const char *script, int argc, const char **argv)
{
	const char **command_line;
	int i, err = 0;

	command_line = malloc((argc + 2) * sizeof(const char *));
	command_line[0] = "";
	command_line[1] = script;
	for (i = 2; i < argc + 2; i++)
		command_line[i] = argv[i - 2];

	my_perl = perl_alloc();
	perl_construct(my_perl);

	if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
		       (char **)NULL)) {
		err = -1;
		goto error;
	}

	if (perl_run(my_perl)) {
		err = -1;
		goto error;
	}

	if (SvTRUE(ERRSV)) {
		err = -1;
		goto error;
	}

	run_start_sub();

	free(command_line);
	fprintf(stderr, "perf trace started with Perl script %s\n\n", script);
	return 0;
error:
	perl_free(my_perl);
	free(command_line);

	return err;
}

/*
 * Stop trace script
 */
static int perl_stop_script(void)
{
	dSP; /* access to Perl stack */
	PUSHMARK(SP);

	if (get_cv("main::trace_end", 0))
		call_pv("main::trace_end", G_DISCARD | G_NOARGS);

	perl_destruct(my_perl);
	perl_free(my_perl);

	fprintf(stderr, "\nperf trace Perl script stopped\n");

	return 0;
}

static int perl_generate_script(const char *outfile)
{
	struct event *event = NULL;
	struct format_field *f;
	char fname[PATH_MAX];
	int not_first, count;
	FILE *ofp;

	sprintf(fname, "%s.pl", outfile);
	ofp = fopen(fname, "w");
	if (ofp == NULL) {
		fprintf(stderr, "couldn't open %s\n", fname);
		return -1;
	}

	fprintf(ofp, "# perf trace event handlers, "
		"generated by perf trace -g perl\n");

	fprintf(ofp, "# Licensed under the terms of the GNU GPL"
		" License version 2\n\n");

	fprintf(ofp, "# The common_* event handler fields are the most useful "
		"fields common to\n");

	fprintf(ofp, "# all events.  They don't necessarily correspond to "
		"the 'common_*' fields\n");

	fprintf(ofp, "# in the format files.  Those fields not available as "
		"handler params can\n");

	fprintf(ofp, "# be retrieved using Perl functions of the form "
		"common_*($context).\n");

	fprintf(ofp, "# See Context.pm for the list of available "
		"functions.\n\n");

	fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
		"Perf-Trace-Util/lib\";\n");

	fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
	fprintf(ofp, "use Perf::Trace::Core;\n");
	fprintf(ofp, "use Perf::Trace::Context;\n");
	fprintf(ofp, "use Perf::Trace::Util;\n\n");

	fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
	fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n\n");

	while ((event = trace_find_next_event(event))) {
		fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
		fprintf(ofp, "\tmy (");

		fprintf(ofp, "$event_name, ");
		fprintf(ofp, "$context, ");
		fprintf(ofp, "$common_cpu, ");
		fprintf(ofp, "$common_secs, ");
		fprintf(ofp, "$common_nsecs,\n");
		fprintf(ofp, "\t    $common_pid, ");
		fprintf(ofp, "$common_comm,\n\t    ");

		not_first = 0;
		count = 0;

		for (f = event->format.fields; f; f = f->next) {
			if (not_first++)
				fprintf(ofp, ", ");
			if (++count % 5 == 0)
				fprintf(ofp, "\n\t    ");

			fprintf(ofp, "$%s", f->name);
		}
		fprintf(ofp, ") = @_;\n\n");

		fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
			"$common_secs, $common_nsecs,\n\t             "
			"$common_pid, $common_comm);\n\n");

		fprintf(ofp, "\tprintf(\"");

		not_first = 0;
		count = 0;

		for (f = event->format.fields; f; f = f->next) {
			if (not_first++)
				fprintf(ofp, ", ");
			if (count && count % 4 == 0) {
				fprintf(ofp, "\".\n\t       \"");
			}
			count++;

			fprintf(ofp, "%s=", f->name);
			if (f->flags & FIELD_IS_STRING ||
			    f->flags & FIELD_IS_FLAG ||
			    f->flags & FIELD_IS_SYMBOLIC)
				fprintf(ofp, "%%s");
			else if (f->flags & FIELD_IS_SIGNED)
				fprintf(ofp, "%%d");
			else
				fprintf(ofp, "%%u");
		}

		fprintf(ofp, "\\n\",\n\t       ");

		not_first = 0;
		count = 0;

		for (f = event->format.fields; f; f = f->next) {
			if (not_first++)
				fprintf(ofp, ", ");

			if (++count % 5 == 0)
				fprintf(ofp, "\n\t       ");

			if (f->flags & FIELD_IS_FLAG) {
				if ((count - 1) % 5 != 0) {
					fprintf(ofp, "\n\t       ");
					count = 4;
				}
				fprintf(ofp, "flag_str(\"");
				fprintf(ofp, "%s::%s\", ", event->system,
					event->name);
				fprintf(ofp, "\"%s\", $%s)", f->name,
					f->name);
			} else if (f->flags & FIELD_IS_SYMBOLIC) {
				if ((count - 1) % 5 != 0) {
					fprintf(ofp, "\n\t       ");
					count = 4;
				}
				fprintf(ofp, "symbol_str(\"");
				fprintf(ofp, "%s::%s\", ", event->system,
					event->name);
				fprintf(ofp, "\"%s\", $%s)", f->name,
					f->name);
			} else
				fprintf(ofp, "$%s", f->name);
		}

		fprintf(ofp, ");\n");
		fprintf(ofp, "}\n\n");
	}

	fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
		"$common_cpu, $common_secs, $common_nsecs,\n\t    "
		"$common_pid, $common_comm) = @_;\n\n");

	fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
		"$common_secs, $common_nsecs,\n\t             $common_pid, "
		"$common_comm);\n}\n\n");

	fprintf(ofp, "sub print_header\n{\n"
		"\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
		"\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t       "
		"$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}");

	fclose(ofp);

	fprintf(stderr, "generated Perl script: %s\n", fname);

	return 0;
}

struct scripting_ops perl_scripting_ops = {
	.name = "Perl",
	.start_script = perl_start_script,
	.stop_script = perl_stop_script,
	.process_event = perl_process_event,
	.generate_script = perl_generate_script,
};

static void print_unsupported_msg(void)
{
	fprintf(stderr, "Perl scripting not supported."
		"  Install libperl and rebuild perf to enable it.\n"
		"For example:\n  # apt-get install libperl-dev (ubuntu)"
		"\n  # yum install perl-ExtUtils-Embed (Fedora)"
		"\n  etc.\n");
}

static int perl_start_script_unsupported(const char *script __unused,
					 int argc __unused,
					 const char **argv __unused)
{
	print_unsupported_msg();

	return -1;
}

static int perl_stop_script_unsupported(void)
{
	return 0;
}

static void perl_process_event_unsupported(int cpu __unused,
					   void *data __unused,
					   int size __unused,
					   unsigned long long nsecs __unused,
					   char *comm __unused)
{
}

static int perl_generate_script_unsupported(const char *outfile __unused)
{
	print_unsupported_msg();

	return -1;
}

struct scripting_ops perl_scripting_unsupported_ops = {
	.name = "Perl",
	.start_script = perl_start_script_unsupported,
	.stop_script = perl_stop_script_unsupported,
	.process_event = perl_process_event_unsupported,
	.generate_script = perl_generate_script_unsupported,
};

static void register_perl_scripting(struct scripting_ops *scripting_ops)
{
	int err;
	err = script_spec_register("Perl", scripting_ops);
	if (err)
		die("error registering Perl script extension");

	err = script_spec_register("pl", scripting_ops);
	if (err)
		die("error registering pl script extension");

	scripting_context = malloc(sizeof(struct scripting_context));
}

#ifdef NO_LIBPERL
void setup_perl_scripting(void)
{
	register_perl_scripting(&perl_scripting_unsupported_ops);
}
#else
void setup_perl_scripting(void)
{
	register_perl_scripting(&perl_scripting_ops);
}
#endif