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1/*
2 * trace-event-perl. Feed perf script events to an embedded Perl interpreter.
3 *
4 * Copyright (C) 2009 Tom Zanussi <tzanussi@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <inttypes.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <ctype.h>
27#include <errno.h>
28#include <linux/bitmap.h>
29#include <linux/time64.h>
30
31#include <stdbool.h>
32/* perl needs the following define, right after including stdbool.h */
33#define HAS_BOOL
34#include <EXTERN.h>
35#include <perl.h>
36
37#include "../callchain.h"
38#include "../dso.h"
39#include "../machine.h"
40#include "../map.h"
41#include "../symbol.h"
42#include "../thread.h"
43#include "../event.h"
44#include "../trace-event.h"
45#include "../evsel.h"
46#include "../debug.h"
47
48void boot_Perf__Trace__Context(pTHX_ CV *cv);
49void boot_DynaLoader(pTHX_ CV *cv);
50typedef PerlInterpreter * INTERP;
51
52void xs_init(pTHX);
53
54void xs_init(pTHX)
55{
56 const char *file = __FILE__;
57 dXSUB_SYS;
58
59 newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
60 file);
61 newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
62}
63
64INTERP my_perl;
65
66#define TRACE_EVENT_TYPE_MAX \
67 ((1 << (sizeof(unsigned short) * 8)) - 1)
68
69static DECLARE_BITMAP(events_defined, TRACE_EVENT_TYPE_MAX);
70
71extern struct scripting_context *scripting_context;
72
73static char *cur_field_name;
74static int zero_flag_atom;
75
76static void define_symbolic_value(const char *ev_name,
77 const char *field_name,
78 const char *field_value,
79 const char *field_str)
80{
81 unsigned long long value;
82 dSP;
83
84 value = eval_flag(field_value);
85
86 ENTER;
87 SAVETMPS;
88 PUSHMARK(SP);
89
90 XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
91 XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
92 XPUSHs(sv_2mortal(newSVuv(value)));
93 XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
94
95 PUTBACK;
96 if (get_cv("main::define_symbolic_value", 0))
97 call_pv("main::define_symbolic_value", G_SCALAR);
98 SPAGAIN;
99 PUTBACK;
100 FREETMPS;
101 LEAVE;
102}
103
104static void define_symbolic_values(struct tep_print_flag_sym *field,
105 const char *ev_name,
106 const char *field_name)
107{
108 define_symbolic_value(ev_name, field_name, field->value, field->str);
109 if (field->next)
110 define_symbolic_values(field->next, ev_name, field_name);
111}
112
113static void define_symbolic_field(const char *ev_name,
114 const char *field_name)
115{
116 dSP;
117
118 ENTER;
119 SAVETMPS;
120 PUSHMARK(SP);
121
122 XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
123 XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
124
125 PUTBACK;
126 if (get_cv("main::define_symbolic_field", 0))
127 call_pv("main::define_symbolic_field", G_SCALAR);
128 SPAGAIN;
129 PUTBACK;
130 FREETMPS;
131 LEAVE;
132}
133
134static void define_flag_value(const char *ev_name,
135 const char *field_name,
136 const char *field_value,
137 const char *field_str)
138{
139 unsigned long long value;
140 dSP;
141
142 value = eval_flag(field_value);
143
144 ENTER;
145 SAVETMPS;
146 PUSHMARK(SP);
147
148 XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
149 XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
150 XPUSHs(sv_2mortal(newSVuv(value)));
151 XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
152
153 PUTBACK;
154 if (get_cv("main::define_flag_value", 0))
155 call_pv("main::define_flag_value", G_SCALAR);
156 SPAGAIN;
157 PUTBACK;
158 FREETMPS;
159 LEAVE;
160}
161
162static void define_flag_values(struct tep_print_flag_sym *field,
163 const char *ev_name,
164 const char *field_name)
165{
166 define_flag_value(ev_name, field_name, field->value, field->str);
167 if (field->next)
168 define_flag_values(field->next, ev_name, field_name);
169}
170
171static void define_flag_field(const char *ev_name,
172 const char *field_name,
173 const char *delim)
174{
175 dSP;
176
177 ENTER;
178 SAVETMPS;
179 PUSHMARK(SP);
180
181 XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
182 XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
183 XPUSHs(sv_2mortal(newSVpv(delim, 0)));
184
185 PUTBACK;
186 if (get_cv("main::define_flag_field", 0))
187 call_pv("main::define_flag_field", G_SCALAR);
188 SPAGAIN;
189 PUTBACK;
190 FREETMPS;
191 LEAVE;
192}
193
194static void define_event_symbols(struct tep_event *event,
195 const char *ev_name,
196 struct tep_print_arg *args)
197{
198 if (args == NULL)
199 return;
200
201 switch (args->type) {
202 case TEP_PRINT_NULL:
203 break;
204 case TEP_PRINT_ATOM:
205 define_flag_value(ev_name, cur_field_name, "0",
206 args->atom.atom);
207 zero_flag_atom = 0;
208 break;
209 case TEP_PRINT_FIELD:
210 free(cur_field_name);
211 cur_field_name = strdup(args->field.name);
212 break;
213 case TEP_PRINT_FLAGS:
214 define_event_symbols(event, ev_name, args->flags.field);
215 define_flag_field(ev_name, cur_field_name, args->flags.delim);
216 define_flag_values(args->flags.flags, ev_name, cur_field_name);
217 break;
218 case TEP_PRINT_SYMBOL:
219 define_event_symbols(event, ev_name, args->symbol.field);
220 define_symbolic_field(ev_name, cur_field_name);
221 define_symbolic_values(args->symbol.symbols, ev_name,
222 cur_field_name);
223 break;
224 case TEP_PRINT_HEX:
225 case TEP_PRINT_HEX_STR:
226 define_event_symbols(event, ev_name, args->hex.field);
227 define_event_symbols(event, ev_name, args->hex.size);
228 break;
229 case TEP_PRINT_INT_ARRAY:
230 define_event_symbols(event, ev_name, args->int_array.field);
231 define_event_symbols(event, ev_name, args->int_array.count);
232 define_event_symbols(event, ev_name, args->int_array.el_size);
233 break;
234 case TEP_PRINT_BSTRING:
235 case TEP_PRINT_DYNAMIC_ARRAY:
236 case TEP_PRINT_DYNAMIC_ARRAY_LEN:
237 case TEP_PRINT_STRING:
238 case TEP_PRINT_BITMASK:
239 break;
240 case TEP_PRINT_TYPE:
241 define_event_symbols(event, ev_name, args->typecast.item);
242 break;
243 case TEP_PRINT_OP:
244 if (strcmp(args->op.op, ":") == 0)
245 zero_flag_atom = 1;
246 define_event_symbols(event, ev_name, args->op.left);
247 define_event_symbols(event, ev_name, args->op.right);
248 break;
249 case TEP_PRINT_FUNC:
250 default:
251 pr_err("Unsupported print arg type\n");
252 /* we should warn... */
253 return;
254 }
255
256 if (args->next)
257 define_event_symbols(event, ev_name, args->next);
258}
259
260static SV *perl_process_callchain(struct perf_sample *sample,
261 struct evsel *evsel,
262 struct addr_location *al)
263{
264 AV *list;
265
266 list = newAV();
267 if (!list)
268 goto exit;
269
270 if (!symbol_conf.use_callchain || !sample->callchain)
271 goto exit;
272
273 if (thread__resolve_callchain(al->thread, &callchain_cursor, evsel,
274 sample, NULL, NULL, scripting_max_stack) != 0) {
275 pr_err("Failed to resolve callchain. Skipping\n");
276 goto exit;
277 }
278 callchain_cursor_commit(&callchain_cursor);
279
280
281 while (1) {
282 HV *elem;
283 struct callchain_cursor_node *node;
284 node = callchain_cursor_current(&callchain_cursor);
285 if (!node)
286 break;
287
288 elem = newHV();
289 if (!elem)
290 goto exit;
291
292 if (!hv_stores(elem, "ip", newSVuv(node->ip))) {
293 hv_undef(elem);
294 goto exit;
295 }
296
297 if (node->ms.sym) {
298 HV *sym = newHV();
299 if (!sym) {
300 hv_undef(elem);
301 goto exit;
302 }
303 if (!hv_stores(sym, "start", newSVuv(node->ms.sym->start)) ||
304 !hv_stores(sym, "end", newSVuv(node->ms.sym->end)) ||
305 !hv_stores(sym, "binding", newSVuv(node->ms.sym->binding)) ||
306 !hv_stores(sym, "name", newSVpvn(node->ms.sym->name,
307 node->ms.sym->namelen)) ||
308 !hv_stores(elem, "sym", newRV_noinc((SV*)sym))) {
309 hv_undef(sym);
310 hv_undef(elem);
311 goto exit;
312 }
313 }
314
315 if (node->ms.map) {
316 struct map *map = node->ms.map;
317 const char *dsoname = "[unknown]";
318 if (map && map->dso) {
319 if (symbol_conf.show_kernel_path && map->dso->long_name)
320 dsoname = map->dso->long_name;
321 else
322 dsoname = map->dso->name;
323 }
324 if (!hv_stores(elem, "dso", newSVpv(dsoname,0))) {
325 hv_undef(elem);
326 goto exit;
327 }
328 }
329
330 callchain_cursor_advance(&callchain_cursor);
331 av_push(list, newRV_noinc((SV*)elem));
332 }
333
334exit:
335 return newRV_noinc((SV*)list);
336}
337
338static void perl_process_tracepoint(struct perf_sample *sample,
339 struct evsel *evsel,
340 struct addr_location *al)
341{
342 struct thread *thread = al->thread;
343 struct tep_event *event = evsel->tp_format;
344 struct tep_format_field *field;
345 static char handler[256];
346 unsigned long long val;
347 unsigned long s, ns;
348 int pid;
349 int cpu = sample->cpu;
350 void *data = sample->raw_data;
351 unsigned long long nsecs = sample->time;
352 const char *comm = thread__comm_str(thread);
353
354 dSP;
355
356 if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
357 return;
358
359 if (!event) {
360 pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->core.attr.config);
361 return;
362 }
363
364 pid = raw_field_value(event, "common_pid", data);
365
366 sprintf(handler, "%s::%s", event->system, event->name);
367
368 if (!test_and_set_bit(event->id, events_defined))
369 define_event_symbols(event, handler, event->print_fmt.args);
370
371 s = nsecs / NSEC_PER_SEC;
372 ns = nsecs - s * NSEC_PER_SEC;
373
374 scripting_context->event_data = data;
375 scripting_context->pevent = evsel->tp_format->tep;
376
377 ENTER;
378 SAVETMPS;
379 PUSHMARK(SP);
380
381 XPUSHs(sv_2mortal(newSVpv(handler, 0)));
382 XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
383 XPUSHs(sv_2mortal(newSVuv(cpu)));
384 XPUSHs(sv_2mortal(newSVuv(s)));
385 XPUSHs(sv_2mortal(newSVuv(ns)));
386 XPUSHs(sv_2mortal(newSViv(pid)));
387 XPUSHs(sv_2mortal(newSVpv(comm, 0)));
388 XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
389
390 /* common fields other than pid can be accessed via xsub fns */
391
392 for (field = event->format.fields; field; field = field->next) {
393 if (field->flags & TEP_FIELD_IS_STRING) {
394 int offset;
395 if (field->flags & TEP_FIELD_IS_DYNAMIC) {
396 offset = *(int *)(data + field->offset);
397 offset &= 0xffff;
398 } else
399 offset = field->offset;
400 XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
401 } else { /* FIELD_IS_NUMERIC */
402 val = read_size(event, data + field->offset,
403 field->size);
404 if (field->flags & TEP_FIELD_IS_SIGNED) {
405 XPUSHs(sv_2mortal(newSViv(val)));
406 } else {
407 XPUSHs(sv_2mortal(newSVuv(val)));
408 }
409 }
410 }
411
412 PUTBACK;
413
414 if (get_cv(handler, 0))
415 call_pv(handler, G_SCALAR);
416 else if (get_cv("main::trace_unhandled", 0)) {
417 XPUSHs(sv_2mortal(newSVpv(handler, 0)));
418 XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
419 XPUSHs(sv_2mortal(newSVuv(cpu)));
420 XPUSHs(sv_2mortal(newSVuv(nsecs)));
421 XPUSHs(sv_2mortal(newSViv(pid)));
422 XPUSHs(sv_2mortal(newSVpv(comm, 0)));
423 XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
424 call_pv("main::trace_unhandled", G_SCALAR);
425 }
426 SPAGAIN;
427 PUTBACK;
428 FREETMPS;
429 LEAVE;
430}
431
432static void perl_process_event_generic(union perf_event *event,
433 struct perf_sample *sample,
434 struct evsel *evsel)
435{
436 dSP;
437
438 if (!get_cv("process_event", 0))
439 return;
440
441 ENTER;
442 SAVETMPS;
443 PUSHMARK(SP);
444 XPUSHs(sv_2mortal(newSVpvn((const char *)event, event->header.size)));
445 XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->core.attr, sizeof(evsel->core.attr))));
446 XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
447 XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
448 PUTBACK;
449 call_pv("process_event", G_SCALAR);
450 SPAGAIN;
451 PUTBACK;
452 FREETMPS;
453 LEAVE;
454}
455
456static void perl_process_event(union perf_event *event,
457 struct perf_sample *sample,
458 struct evsel *evsel,
459 struct addr_location *al)
460{
461 perl_process_tracepoint(sample, evsel, al);
462 perl_process_event_generic(event, sample, evsel);
463}
464
465static void run_start_sub(void)
466{
467 dSP; /* access to Perl stack */
468 PUSHMARK(SP);
469
470 if (get_cv("main::trace_begin", 0))
471 call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
472}
473
474/*
475 * Start trace script
476 */
477static int perl_start_script(const char *script, int argc, const char **argv)
478{
479 const char **command_line;
480 int i, err = 0;
481
482 command_line = malloc((argc + 2) * sizeof(const char *));
483 command_line[0] = "";
484 command_line[1] = script;
485 for (i = 2; i < argc + 2; i++)
486 command_line[i] = argv[i - 2];
487
488 my_perl = perl_alloc();
489 perl_construct(my_perl);
490
491 if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
492 (char **)NULL)) {
493 err = -1;
494 goto error;
495 }
496
497 if (perl_run(my_perl)) {
498 err = -1;
499 goto error;
500 }
501
502 if (SvTRUE(ERRSV)) {
503 err = -1;
504 goto error;
505 }
506
507 run_start_sub();
508
509 free(command_line);
510 return 0;
511error:
512 perl_free(my_perl);
513 free(command_line);
514
515 return err;
516}
517
518static int perl_flush_script(void)
519{
520 return 0;
521}
522
523/*
524 * Stop trace script
525 */
526static int perl_stop_script(void)
527{
528 dSP; /* access to Perl stack */
529 PUSHMARK(SP);
530
531 if (get_cv("main::trace_end", 0))
532 call_pv("main::trace_end", G_DISCARD | G_NOARGS);
533
534 perl_destruct(my_perl);
535 perl_free(my_perl);
536
537 return 0;
538}
539
540static int perl_generate_script(struct tep_handle *pevent, const char *outfile)
541{
542 int i, not_first, count, nr_events;
543 struct tep_event **all_events;
544 struct tep_event *event = NULL;
545 struct tep_format_field *f;
546 char fname[PATH_MAX];
547 FILE *ofp;
548
549 sprintf(fname, "%s.pl", outfile);
550 ofp = fopen(fname, "w");
551 if (ofp == NULL) {
552 fprintf(stderr, "couldn't open %s\n", fname);
553 return -1;
554 }
555
556 fprintf(ofp, "# perf script event handlers, "
557 "generated by perf script -g perl\n");
558
559 fprintf(ofp, "# Licensed under the terms of the GNU GPL"
560 " License version 2\n\n");
561
562 fprintf(ofp, "# The common_* event handler fields are the most useful "
563 "fields common to\n");
564
565 fprintf(ofp, "# all events. They don't necessarily correspond to "
566 "the 'common_*' fields\n");
567
568 fprintf(ofp, "# in the format files. Those fields not available as "
569 "handler params can\n");
570
571 fprintf(ofp, "# be retrieved using Perl functions of the form "
572 "common_*($context).\n");
573
574 fprintf(ofp, "# See Context.pm for the list of available "
575 "functions.\n\n");
576
577 fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
578 "Perf-Trace-Util/lib\";\n");
579
580 fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
581 fprintf(ofp, "use Perf::Trace::Core;\n");
582 fprintf(ofp, "use Perf::Trace::Context;\n");
583 fprintf(ofp, "use Perf::Trace::Util;\n\n");
584
585 fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
586 fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n");
587
588
589 fprintf(ofp, "\n\
590sub print_backtrace\n\
591{\n\
592 my $callchain = shift;\n\
593 for my $node (@$callchain)\n\
594 {\n\
595 if(exists $node->{sym})\n\
596 {\n\
597 printf( \"\\t[\\%%x] \\%%s\\n\", $node->{ip}, $node->{sym}{name});\n\
598 }\n\
599 else\n\
600 {\n\
601 printf( \"\\t[\\%%x]\\n\", $node{ip});\n\
602 }\n\
603 }\n\
604}\n\n\
605");
606
607 nr_events = tep_get_events_count(pevent);
608 all_events = tep_list_events(pevent, TEP_EVENT_SORT_ID);
609
610 for (i = 0; all_events && i < nr_events; i++) {
611 event = all_events[i];
612 fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
613 fprintf(ofp, "\tmy (");
614
615 fprintf(ofp, "$event_name, ");
616 fprintf(ofp, "$context, ");
617 fprintf(ofp, "$common_cpu, ");
618 fprintf(ofp, "$common_secs, ");
619 fprintf(ofp, "$common_nsecs,\n");
620 fprintf(ofp, "\t $common_pid, ");
621 fprintf(ofp, "$common_comm, ");
622 fprintf(ofp, "$common_callchain,\n\t ");
623
624 not_first = 0;
625 count = 0;
626
627 for (f = event->format.fields; f; f = f->next) {
628 if (not_first++)
629 fprintf(ofp, ", ");
630 if (++count % 5 == 0)
631 fprintf(ofp, "\n\t ");
632
633 fprintf(ofp, "$%s", f->name);
634 }
635 fprintf(ofp, ") = @_;\n\n");
636
637 fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
638 "$common_secs, $common_nsecs,\n\t "
639 "$common_pid, $common_comm, $common_callchain);\n\n");
640
641 fprintf(ofp, "\tprintf(\"");
642
643 not_first = 0;
644 count = 0;
645
646 for (f = event->format.fields; f; f = f->next) {
647 if (not_first++)
648 fprintf(ofp, ", ");
649 if (count && count % 4 == 0) {
650 fprintf(ofp, "\".\n\t \"");
651 }
652 count++;
653
654 fprintf(ofp, "%s=", f->name);
655 if (f->flags & TEP_FIELD_IS_STRING ||
656 f->flags & TEP_FIELD_IS_FLAG ||
657 f->flags & TEP_FIELD_IS_SYMBOLIC)
658 fprintf(ofp, "%%s");
659 else if (f->flags & TEP_FIELD_IS_SIGNED)
660 fprintf(ofp, "%%d");
661 else
662 fprintf(ofp, "%%u");
663 }
664
665 fprintf(ofp, "\\n\",\n\t ");
666
667 not_first = 0;
668 count = 0;
669
670 for (f = event->format.fields; f; f = f->next) {
671 if (not_first++)
672 fprintf(ofp, ", ");
673
674 if (++count % 5 == 0)
675 fprintf(ofp, "\n\t ");
676
677 if (f->flags & TEP_FIELD_IS_FLAG) {
678 if ((count - 1) % 5 != 0) {
679 fprintf(ofp, "\n\t ");
680 count = 4;
681 }
682 fprintf(ofp, "flag_str(\"");
683 fprintf(ofp, "%s::%s\", ", event->system,
684 event->name);
685 fprintf(ofp, "\"%s\", $%s)", f->name,
686 f->name);
687 } else if (f->flags & TEP_FIELD_IS_SYMBOLIC) {
688 if ((count - 1) % 5 != 0) {
689 fprintf(ofp, "\n\t ");
690 count = 4;
691 }
692 fprintf(ofp, "symbol_str(\"");
693 fprintf(ofp, "%s::%s\", ", event->system,
694 event->name);
695 fprintf(ofp, "\"%s\", $%s)", f->name,
696 f->name);
697 } else
698 fprintf(ofp, "$%s", f->name);
699 }
700
701 fprintf(ofp, ");\n\n");
702
703 fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
704
705 fprintf(ofp, "}\n\n");
706 }
707
708 fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
709 "$common_cpu, $common_secs, $common_nsecs,\n\t "
710 "$common_pid, $common_comm, $common_callchain) = @_;\n\n");
711
712 fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
713 "$common_secs, $common_nsecs,\n\t $common_pid, "
714 "$common_comm, $common_callchain);\n");
715 fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
716 fprintf(ofp, "}\n\n");
717
718 fprintf(ofp, "sub print_header\n{\n"
719 "\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
720 "\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t "
721 "$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
722
723 fprintf(ofp,
724 "\n# Packed byte string args of process_event():\n"
725 "#\n"
726 "# $event:\tunion perf_event\tutil/event.h\n"
727 "# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
728 "# $sample:\tstruct perf_sample\tutil/event.h\n"
729 "# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
730 "\n"
731 "sub process_event\n"
732 "{\n"
733 "\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
734 "\n"
735 "\tmy @event\t= unpack(\"LSS\", $event);\n"
736 "\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
737 "\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
738 "\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
739 "\n"
740 "\tuse Data::Dumper;\n"
741 "\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
742 "}\n");
743
744 fclose(ofp);
745
746 fprintf(stderr, "generated Perl script: %s\n", fname);
747
748 return 0;
749}
750
751struct scripting_ops perl_scripting_ops = {
752 .name = "Perl",
753 .start_script = perl_start_script,
754 .flush_script = perl_flush_script,
755 .stop_script = perl_stop_script,
756 .process_event = perl_process_event,
757 .generate_script = perl_generate_script,
758};
1/*
2 * trace-event-perl. Feed perf script events to an embedded Perl interpreter.
3 *
4 * Copyright (C) 2009 Tom Zanussi <tzanussi@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 */
21
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <ctype.h>
26#include <errno.h>
27
28#include "../../perf.h"
29#include "../util.h"
30#include "../thread.h"
31#include "../event.h"
32#include "../trace-event.h"
33#include "../evsel.h"
34
35#include <EXTERN.h>
36#include <perl.h>
37
38void boot_Perf__Trace__Context(pTHX_ CV *cv);
39void boot_DynaLoader(pTHX_ CV *cv);
40typedef PerlInterpreter * INTERP;
41
42void xs_init(pTHX);
43
44void xs_init(pTHX)
45{
46 const char *file = __FILE__;
47 dXSUB_SYS;
48
49 newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
50 file);
51 newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
52}
53
54INTERP my_perl;
55
56#define FTRACE_MAX_EVENT \
57 ((1 << (sizeof(unsigned short) * 8)) - 1)
58
59struct event_format *events[FTRACE_MAX_EVENT];
60
61extern struct scripting_context *scripting_context;
62
63static char *cur_field_name;
64static int zero_flag_atom;
65
66static void define_symbolic_value(const char *ev_name,
67 const char *field_name,
68 const char *field_value,
69 const char *field_str)
70{
71 unsigned long long value;
72 dSP;
73
74 value = eval_flag(field_value);
75
76 ENTER;
77 SAVETMPS;
78 PUSHMARK(SP);
79
80 XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
81 XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
82 XPUSHs(sv_2mortal(newSVuv(value)));
83 XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
84
85 PUTBACK;
86 if (get_cv("main::define_symbolic_value", 0))
87 call_pv("main::define_symbolic_value", G_SCALAR);
88 SPAGAIN;
89 PUTBACK;
90 FREETMPS;
91 LEAVE;
92}
93
94static void define_symbolic_values(struct print_flag_sym *field,
95 const char *ev_name,
96 const char *field_name)
97{
98 define_symbolic_value(ev_name, field_name, field->value, field->str);
99 if (field->next)
100 define_symbolic_values(field->next, ev_name, field_name);
101}
102
103static void define_symbolic_field(const char *ev_name,
104 const char *field_name)
105{
106 dSP;
107
108 ENTER;
109 SAVETMPS;
110 PUSHMARK(SP);
111
112 XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
113 XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
114
115 PUTBACK;
116 if (get_cv("main::define_symbolic_field", 0))
117 call_pv("main::define_symbolic_field", G_SCALAR);
118 SPAGAIN;
119 PUTBACK;
120 FREETMPS;
121 LEAVE;
122}
123
124static void define_flag_value(const char *ev_name,
125 const char *field_name,
126 const char *field_value,
127 const char *field_str)
128{
129 unsigned long long value;
130 dSP;
131
132 value = eval_flag(field_value);
133
134 ENTER;
135 SAVETMPS;
136 PUSHMARK(SP);
137
138 XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
139 XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
140 XPUSHs(sv_2mortal(newSVuv(value)));
141 XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
142
143 PUTBACK;
144 if (get_cv("main::define_flag_value", 0))
145 call_pv("main::define_flag_value", G_SCALAR);
146 SPAGAIN;
147 PUTBACK;
148 FREETMPS;
149 LEAVE;
150}
151
152static void define_flag_values(struct print_flag_sym *field,
153 const char *ev_name,
154 const char *field_name)
155{
156 define_flag_value(ev_name, field_name, field->value, field->str);
157 if (field->next)
158 define_flag_values(field->next, ev_name, field_name);
159}
160
161static void define_flag_field(const char *ev_name,
162 const char *field_name,
163 const char *delim)
164{
165 dSP;
166
167 ENTER;
168 SAVETMPS;
169 PUSHMARK(SP);
170
171 XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
172 XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
173 XPUSHs(sv_2mortal(newSVpv(delim, 0)));
174
175 PUTBACK;
176 if (get_cv("main::define_flag_field", 0))
177 call_pv("main::define_flag_field", G_SCALAR);
178 SPAGAIN;
179 PUTBACK;
180 FREETMPS;
181 LEAVE;
182}
183
184static void define_event_symbols(struct event_format *event,
185 const char *ev_name,
186 struct print_arg *args)
187{
188 switch (args->type) {
189 case PRINT_NULL:
190 break;
191 case PRINT_ATOM:
192 define_flag_value(ev_name, cur_field_name, "0",
193 args->atom.atom);
194 zero_flag_atom = 0;
195 break;
196 case PRINT_FIELD:
197 if (cur_field_name)
198 free(cur_field_name);
199 cur_field_name = strdup(args->field.name);
200 break;
201 case PRINT_FLAGS:
202 define_event_symbols(event, ev_name, args->flags.field);
203 define_flag_field(ev_name, cur_field_name, args->flags.delim);
204 define_flag_values(args->flags.flags, ev_name, cur_field_name);
205 break;
206 case PRINT_SYMBOL:
207 define_event_symbols(event, ev_name, args->symbol.field);
208 define_symbolic_field(ev_name, cur_field_name);
209 define_symbolic_values(args->symbol.symbols, ev_name,
210 cur_field_name);
211 break;
212 case PRINT_BSTRING:
213 case PRINT_DYNAMIC_ARRAY:
214 case PRINT_STRING:
215 break;
216 case PRINT_TYPE:
217 define_event_symbols(event, ev_name, args->typecast.item);
218 break;
219 case PRINT_OP:
220 if (strcmp(args->op.op, ":") == 0)
221 zero_flag_atom = 1;
222 define_event_symbols(event, ev_name, args->op.left);
223 define_event_symbols(event, ev_name, args->op.right);
224 break;
225 case PRINT_FUNC:
226 default:
227 pr_err("Unsupported print arg type\n");
228 /* we should warn... */
229 return;
230 }
231
232 if (args->next)
233 define_event_symbols(event, ev_name, args->next);
234}
235
236static inline struct event_format *find_cache_event(int type)
237{
238 static char ev_name[256];
239 struct event_format *event;
240
241 if (events[type])
242 return events[type];
243
244 events[type] = event = trace_find_event(type);
245 if (!event)
246 return NULL;
247
248 sprintf(ev_name, "%s::%s", event->system, event->name);
249
250 define_event_symbols(event, ev_name, event->print_fmt.args);
251
252 return event;
253}
254
255static void perl_process_tracepoint(union perf_event *pevent __unused,
256 struct perf_sample *sample,
257 struct perf_evsel *evsel,
258 struct machine *machine __unused,
259 struct thread *thread)
260{
261 struct format_field *field;
262 static char handler[256];
263 unsigned long long val;
264 unsigned long s, ns;
265 struct event_format *event;
266 int type;
267 int pid;
268 int cpu = sample->cpu;
269 void *data = sample->raw_data;
270 unsigned long long nsecs = sample->time;
271 char *comm = thread->comm;
272
273 dSP;
274
275 if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
276 return;
277
278 type = trace_parse_common_type(data);
279
280 event = find_cache_event(type);
281 if (!event)
282 die("ug! no event found for type %d", type);
283
284 pid = trace_parse_common_pid(data);
285
286 sprintf(handler, "%s::%s", event->system, event->name);
287
288 s = nsecs / NSECS_PER_SEC;
289 ns = nsecs - s * NSECS_PER_SEC;
290
291 scripting_context->event_data = data;
292
293 ENTER;
294 SAVETMPS;
295 PUSHMARK(SP);
296
297 XPUSHs(sv_2mortal(newSVpv(handler, 0)));
298 XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
299 XPUSHs(sv_2mortal(newSVuv(cpu)));
300 XPUSHs(sv_2mortal(newSVuv(s)));
301 XPUSHs(sv_2mortal(newSVuv(ns)));
302 XPUSHs(sv_2mortal(newSViv(pid)));
303 XPUSHs(sv_2mortal(newSVpv(comm, 0)));
304
305 /* common fields other than pid can be accessed via xsub fns */
306
307 for (field = event->format.fields; field; field = field->next) {
308 if (field->flags & FIELD_IS_STRING) {
309 int offset;
310 if (field->flags & FIELD_IS_DYNAMIC) {
311 offset = *(int *)(data + field->offset);
312 offset &= 0xffff;
313 } else
314 offset = field->offset;
315 XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
316 } else { /* FIELD_IS_NUMERIC */
317 val = read_size(data + field->offset, field->size);
318 if (field->flags & FIELD_IS_SIGNED) {
319 XPUSHs(sv_2mortal(newSViv(val)));
320 } else {
321 XPUSHs(sv_2mortal(newSVuv(val)));
322 }
323 }
324 }
325
326 PUTBACK;
327
328 if (get_cv(handler, 0))
329 call_pv(handler, G_SCALAR);
330 else if (get_cv("main::trace_unhandled", 0)) {
331 XPUSHs(sv_2mortal(newSVpv(handler, 0)));
332 XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
333 XPUSHs(sv_2mortal(newSVuv(cpu)));
334 XPUSHs(sv_2mortal(newSVuv(nsecs)));
335 XPUSHs(sv_2mortal(newSViv(pid)));
336 XPUSHs(sv_2mortal(newSVpv(comm, 0)));
337 call_pv("main::trace_unhandled", G_SCALAR);
338 }
339 SPAGAIN;
340 PUTBACK;
341 FREETMPS;
342 LEAVE;
343}
344
345static void perl_process_event_generic(union perf_event *pevent __unused,
346 struct perf_sample *sample,
347 struct perf_evsel *evsel __unused,
348 struct machine *machine __unused,
349 struct thread *thread __unused)
350{
351 dSP;
352
353 if (!get_cv("process_event", 0))
354 return;
355
356 ENTER;
357 SAVETMPS;
358 PUSHMARK(SP);
359 XPUSHs(sv_2mortal(newSVpvn((const char *)pevent, pevent->header.size)));
360 XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->attr, sizeof(evsel->attr))));
361 XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
362 XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
363 PUTBACK;
364 call_pv("process_event", G_SCALAR);
365 SPAGAIN;
366 PUTBACK;
367 FREETMPS;
368 LEAVE;
369}
370
371static void perl_process_event(union perf_event *pevent,
372 struct perf_sample *sample,
373 struct perf_evsel *evsel,
374 struct machine *machine,
375 struct thread *thread)
376{
377 perl_process_tracepoint(pevent, sample, evsel, machine, thread);
378 perl_process_event_generic(pevent, sample, evsel, machine, thread);
379}
380
381static void run_start_sub(void)
382{
383 dSP; /* access to Perl stack */
384 PUSHMARK(SP);
385
386 if (get_cv("main::trace_begin", 0))
387 call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
388}
389
390/*
391 * Start trace script
392 */
393static int perl_start_script(const char *script, int argc, const char **argv)
394{
395 const char **command_line;
396 int i, err = 0;
397
398 command_line = malloc((argc + 2) * sizeof(const char *));
399 command_line[0] = "";
400 command_line[1] = script;
401 for (i = 2; i < argc + 2; i++)
402 command_line[i] = argv[i - 2];
403
404 my_perl = perl_alloc();
405 perl_construct(my_perl);
406
407 if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
408 (char **)NULL)) {
409 err = -1;
410 goto error;
411 }
412
413 if (perl_run(my_perl)) {
414 err = -1;
415 goto error;
416 }
417
418 if (SvTRUE(ERRSV)) {
419 err = -1;
420 goto error;
421 }
422
423 run_start_sub();
424
425 free(command_line);
426 return 0;
427error:
428 perl_free(my_perl);
429 free(command_line);
430
431 return err;
432}
433
434/*
435 * Stop trace script
436 */
437static int perl_stop_script(void)
438{
439 dSP; /* access to Perl stack */
440 PUSHMARK(SP);
441
442 if (get_cv("main::trace_end", 0))
443 call_pv("main::trace_end", G_DISCARD | G_NOARGS);
444
445 perl_destruct(my_perl);
446 perl_free(my_perl);
447
448 return 0;
449}
450
451static int perl_generate_script(const char *outfile)
452{
453 struct event_format *event = NULL;
454 struct format_field *f;
455 char fname[PATH_MAX];
456 int not_first, count;
457 FILE *ofp;
458
459 sprintf(fname, "%s.pl", outfile);
460 ofp = fopen(fname, "w");
461 if (ofp == NULL) {
462 fprintf(stderr, "couldn't open %s\n", fname);
463 return -1;
464 }
465
466 fprintf(ofp, "# perf script event handlers, "
467 "generated by perf script -g perl\n");
468
469 fprintf(ofp, "# Licensed under the terms of the GNU GPL"
470 " License version 2\n\n");
471
472 fprintf(ofp, "# The common_* event handler fields are the most useful "
473 "fields common to\n");
474
475 fprintf(ofp, "# all events. They don't necessarily correspond to "
476 "the 'common_*' fields\n");
477
478 fprintf(ofp, "# in the format files. Those fields not available as "
479 "handler params can\n");
480
481 fprintf(ofp, "# be retrieved using Perl functions of the form "
482 "common_*($context).\n");
483
484 fprintf(ofp, "# See Context.pm for the list of available "
485 "functions.\n\n");
486
487 fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
488 "Perf-Trace-Util/lib\";\n");
489
490 fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
491 fprintf(ofp, "use Perf::Trace::Core;\n");
492 fprintf(ofp, "use Perf::Trace::Context;\n");
493 fprintf(ofp, "use Perf::Trace::Util;\n\n");
494
495 fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
496 fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n\n");
497
498 while ((event = trace_find_next_event(event))) {
499 fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
500 fprintf(ofp, "\tmy (");
501
502 fprintf(ofp, "$event_name, ");
503 fprintf(ofp, "$context, ");
504 fprintf(ofp, "$common_cpu, ");
505 fprintf(ofp, "$common_secs, ");
506 fprintf(ofp, "$common_nsecs,\n");
507 fprintf(ofp, "\t $common_pid, ");
508 fprintf(ofp, "$common_comm,\n\t ");
509
510 not_first = 0;
511 count = 0;
512
513 for (f = event->format.fields; f; f = f->next) {
514 if (not_first++)
515 fprintf(ofp, ", ");
516 if (++count % 5 == 0)
517 fprintf(ofp, "\n\t ");
518
519 fprintf(ofp, "$%s", f->name);
520 }
521 fprintf(ofp, ") = @_;\n\n");
522
523 fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
524 "$common_secs, $common_nsecs,\n\t "
525 "$common_pid, $common_comm);\n\n");
526
527 fprintf(ofp, "\tprintf(\"");
528
529 not_first = 0;
530 count = 0;
531
532 for (f = event->format.fields; f; f = f->next) {
533 if (not_first++)
534 fprintf(ofp, ", ");
535 if (count && count % 4 == 0) {
536 fprintf(ofp, "\".\n\t \"");
537 }
538 count++;
539
540 fprintf(ofp, "%s=", f->name);
541 if (f->flags & FIELD_IS_STRING ||
542 f->flags & FIELD_IS_FLAG ||
543 f->flags & FIELD_IS_SYMBOLIC)
544 fprintf(ofp, "%%s");
545 else if (f->flags & FIELD_IS_SIGNED)
546 fprintf(ofp, "%%d");
547 else
548 fprintf(ofp, "%%u");
549 }
550
551 fprintf(ofp, "\\n\",\n\t ");
552
553 not_first = 0;
554 count = 0;
555
556 for (f = event->format.fields; f; f = f->next) {
557 if (not_first++)
558 fprintf(ofp, ", ");
559
560 if (++count % 5 == 0)
561 fprintf(ofp, "\n\t ");
562
563 if (f->flags & FIELD_IS_FLAG) {
564 if ((count - 1) % 5 != 0) {
565 fprintf(ofp, "\n\t ");
566 count = 4;
567 }
568 fprintf(ofp, "flag_str(\"");
569 fprintf(ofp, "%s::%s\", ", event->system,
570 event->name);
571 fprintf(ofp, "\"%s\", $%s)", f->name,
572 f->name);
573 } else if (f->flags & FIELD_IS_SYMBOLIC) {
574 if ((count - 1) % 5 != 0) {
575 fprintf(ofp, "\n\t ");
576 count = 4;
577 }
578 fprintf(ofp, "symbol_str(\"");
579 fprintf(ofp, "%s::%s\", ", event->system,
580 event->name);
581 fprintf(ofp, "\"%s\", $%s)", f->name,
582 f->name);
583 } else
584 fprintf(ofp, "$%s", f->name);
585 }
586
587 fprintf(ofp, ");\n");
588 fprintf(ofp, "}\n\n");
589 }
590
591 fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
592 "$common_cpu, $common_secs, $common_nsecs,\n\t "
593 "$common_pid, $common_comm) = @_;\n\n");
594
595 fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
596 "$common_secs, $common_nsecs,\n\t $common_pid, "
597 "$common_comm);\n}\n\n");
598
599 fprintf(ofp, "sub print_header\n{\n"
600 "\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
601 "\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t "
602 "$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
603
604 fprintf(ofp,
605 "\n# Packed byte string args of process_event():\n"
606 "#\n"
607 "# $event:\tunion perf_event\tutil/event.h\n"
608 "# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
609 "# $sample:\tstruct perf_sample\tutil/event.h\n"
610 "# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
611 "\n"
612 "sub process_event\n"
613 "{\n"
614 "\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
615 "\n"
616 "\tmy @event\t= unpack(\"LSS\", $event);\n"
617 "\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
618 "\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
619 "\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
620 "\n"
621 "\tuse Data::Dumper;\n"
622 "\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
623 "}\n");
624
625 fclose(ofp);
626
627 fprintf(stderr, "generated Perl script: %s\n", fname);
628
629 return 0;
630}
631
632struct scripting_ops perl_scripting_ops = {
633 .name = "Perl",
634 .start_script = perl_start_script,
635 .stop_script = perl_stop_script,
636 .process_event = perl_process_event,
637 .generate_script = perl_generate_script,
638};