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 #include <traceevent/event-parse.h>
31 
32 #include <stdbool.h>
33 /* perl needs the following define, right after including stdbool.h */
34 #define HAS_BOOL
35 #include <EXTERN.h>
36 #include <perl.h>
37 
38 #include "../callchain.h"
39 #include "../dso.h"
40 #include "../machine.h"
41 #include "../map.h"
42 #include "../symbol.h"
43 #include "../thread.h"
44 #include "../event.h"
45 #include "../trace-event.h"
46 #include "../evsel.h"
47 #include "../debug.h"
48 
49 void boot_Perf__Trace__Context(pTHX_ CV *cv);
50 void boot_DynaLoader(pTHX_ CV *cv);
51 typedef PerlInterpreter * INTERP;
52 
53 void xs_init(pTHX);
54 
55 void xs_init(pTHX)
56 {
57 	const char *file = __FILE__;
58 	dXSUB_SYS;
59 
60 	newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
61 	      file);
62 	newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
63 }
64 
65 INTERP my_perl;
66 
67 #define TRACE_EVENT_TYPE_MAX				\
68 	((1 << (sizeof(unsigned short) * 8)) - 1)
69 
70 static DECLARE_BITMAP(events_defined, TRACE_EVENT_TYPE_MAX);
71 
72 extern struct scripting_context *scripting_context;
73 
74 static char *cur_field_name;
75 static int zero_flag_atom;
76 
77 static void define_symbolic_value(const char *ev_name,
78 				  const char *field_name,
79 				  const char *field_value,
80 				  const char *field_str)
81 {
82 	unsigned long long value;
83 	dSP;
84 
85 	value = eval_flag(field_value);
86 
87 	ENTER;
88 	SAVETMPS;
89 	PUSHMARK(SP);
90 
91 	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
92 	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
93 	XPUSHs(sv_2mortal(newSVuv(value)));
94 	XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
95 
96 	PUTBACK;
97 	if (get_cv("main::define_symbolic_value", 0))
98 		call_pv("main::define_symbolic_value", G_SCALAR);
99 	SPAGAIN;
100 	PUTBACK;
101 	FREETMPS;
102 	LEAVE;
103 }
104 
105 static void define_symbolic_values(struct tep_print_flag_sym *field,
106 				   const char *ev_name,
107 				   const char *field_name)
108 {
109 	define_symbolic_value(ev_name, field_name, field->value, field->str);
110 	if (field->next)
111 		define_symbolic_values(field->next, ev_name, field_name);
112 }
113 
114 static void define_symbolic_field(const char *ev_name,
115 				  const char *field_name)
116 {
117 	dSP;
118 
119 	ENTER;
120 	SAVETMPS;
121 	PUSHMARK(SP);
122 
123 	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
124 	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
125 
126 	PUTBACK;
127 	if (get_cv("main::define_symbolic_field", 0))
128 		call_pv("main::define_symbolic_field", G_SCALAR);
129 	SPAGAIN;
130 	PUTBACK;
131 	FREETMPS;
132 	LEAVE;
133 }
134 
135 static void define_flag_value(const char *ev_name,
136 			      const char *field_name,
137 			      const char *field_value,
138 			      const char *field_str)
139 {
140 	unsigned long long value;
141 	dSP;
142 
143 	value = eval_flag(field_value);
144 
145 	ENTER;
146 	SAVETMPS;
147 	PUSHMARK(SP);
148 
149 	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
150 	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
151 	XPUSHs(sv_2mortal(newSVuv(value)));
152 	XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
153 
154 	PUTBACK;
155 	if (get_cv("main::define_flag_value", 0))
156 		call_pv("main::define_flag_value", G_SCALAR);
157 	SPAGAIN;
158 	PUTBACK;
159 	FREETMPS;
160 	LEAVE;
161 }
162 
163 static void define_flag_values(struct tep_print_flag_sym *field,
164 			       const char *ev_name,
165 			       const char *field_name)
166 {
167 	define_flag_value(ev_name, field_name, field->value, field->str);
168 	if (field->next)
169 		define_flag_values(field->next, ev_name, field_name);
170 }
171 
172 static void define_flag_field(const char *ev_name,
173 			      const char *field_name,
174 			      const char *delim)
175 {
176 	dSP;
177 
178 	ENTER;
179 	SAVETMPS;
180 	PUSHMARK(SP);
181 
182 	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
183 	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
184 	XPUSHs(sv_2mortal(newSVpv(delim, 0)));
185 
186 	PUTBACK;
187 	if (get_cv("main::define_flag_field", 0))
188 		call_pv("main::define_flag_field", G_SCALAR);
189 	SPAGAIN;
190 	PUTBACK;
191 	FREETMPS;
192 	LEAVE;
193 }
194 
195 static void define_event_symbols(struct tep_event *event,
196 				 const char *ev_name,
197 				 struct tep_print_arg *args)
198 {
199 	if (args == NULL)
200 		return;
201 
202 	switch (args->type) {
203 	case TEP_PRINT_NULL:
204 		break;
205 	case TEP_PRINT_ATOM:
206 		define_flag_value(ev_name, cur_field_name, "0",
207 				  args->atom.atom);
208 		zero_flag_atom = 0;
209 		break;
210 	case TEP_PRINT_FIELD:
211 		free(cur_field_name);
212 		cur_field_name = strdup(args->field.name);
213 		break;
214 	case TEP_PRINT_FLAGS:
215 		define_event_symbols(event, ev_name, args->flags.field);
216 		define_flag_field(ev_name, cur_field_name, args->flags.delim);
217 		define_flag_values(args->flags.flags, ev_name, cur_field_name);
218 		break;
219 	case TEP_PRINT_SYMBOL:
220 		define_event_symbols(event, ev_name, args->symbol.field);
221 		define_symbolic_field(ev_name, cur_field_name);
222 		define_symbolic_values(args->symbol.symbols, ev_name,
223 				       cur_field_name);
224 		break;
225 	case TEP_PRINT_HEX:
226 	case TEP_PRINT_HEX_STR:
227 		define_event_symbols(event, ev_name, args->hex.field);
228 		define_event_symbols(event, ev_name, args->hex.size);
229 		break;
230 	case TEP_PRINT_INT_ARRAY:
231 		define_event_symbols(event, ev_name, args->int_array.field);
232 		define_event_symbols(event, ev_name, args->int_array.count);
233 		define_event_symbols(event, ev_name, args->int_array.el_size);
234 		break;
235 	case TEP_PRINT_BSTRING:
236 	case TEP_PRINT_DYNAMIC_ARRAY:
237 	case TEP_PRINT_DYNAMIC_ARRAY_LEN:
238 	case TEP_PRINT_STRING:
239 	case TEP_PRINT_BITMASK:
240 		break;
241 	case TEP_PRINT_TYPE:
242 		define_event_symbols(event, ev_name, args->typecast.item);
243 		break;
244 	case TEP_PRINT_OP:
245 		if (strcmp(args->op.op, ":") == 0)
246 			zero_flag_atom = 1;
247 		define_event_symbols(event, ev_name, args->op.left);
248 		define_event_symbols(event, ev_name, args->op.right);
249 		break;
250 	case TEP_PRINT_FUNC:
251 	default:
252 		pr_err("Unsupported print arg type\n");
253 		/* we should warn... */
254 		return;
255 	}
256 
257 	if (args->next)
258 		define_event_symbols(event, ev_name, args->next);
259 }
260 
261 static SV *perl_process_callchain(struct perf_sample *sample,
262 				  struct evsel *evsel,
263 				  struct addr_location *al)
264 {
265 	AV *list;
266 
267 	list = newAV();
268 	if (!list)
269 		goto exit;
270 
271 	if (!symbol_conf.use_callchain || !sample->callchain)
272 		goto exit;
273 
274 	if (thread__resolve_callchain(al->thread, &callchain_cursor, evsel,
275 				      sample, NULL, NULL, scripting_max_stack) != 0) {
276 		pr_err("Failed to resolve callchain. Skipping\n");
277 		goto exit;
278 	}
279 	callchain_cursor_commit(&callchain_cursor);
280 
281 
282 	while (1) {
283 		HV *elem;
284 		struct callchain_cursor_node *node;
285 		node = callchain_cursor_current(&callchain_cursor);
286 		if (!node)
287 			break;
288 
289 		elem = newHV();
290 		if (!elem)
291 			goto exit;
292 
293 		if (!hv_stores(elem, "ip", newSVuv(node->ip))) {
294 			hv_undef(elem);
295 			goto exit;
296 		}
297 
298 		if (node->ms.sym) {
299 			HV *sym = newHV();
300 			if (!sym) {
301 				hv_undef(elem);
302 				goto exit;
303 			}
304 			if (!hv_stores(sym, "start",   newSVuv(node->ms.sym->start)) ||
305 			    !hv_stores(sym, "end",     newSVuv(node->ms.sym->end)) ||
306 			    !hv_stores(sym, "binding", newSVuv(node->ms.sym->binding)) ||
307 			    !hv_stores(sym, "name",    newSVpvn(node->ms.sym->name,
308 								node->ms.sym->namelen)) ||
309 			    !hv_stores(elem, "sym",    newRV_noinc((SV*)sym))) {
310 				hv_undef(sym);
311 				hv_undef(elem);
312 				goto exit;
313 			}
314 		}
315 
316 		if (node->ms.map) {
317 			struct map *map = node->ms.map;
318 			const char *dsoname = "[unknown]";
319 			if (map && map->dso) {
320 				if (symbol_conf.show_kernel_path && map->dso->long_name)
321 					dsoname = map->dso->long_name;
322 				else
323 					dsoname = map->dso->name;
324 			}
325 			if (!hv_stores(elem, "dso", newSVpv(dsoname,0))) {
326 				hv_undef(elem);
327 				goto exit;
328 			}
329 		}
330 
331 		callchain_cursor_advance(&callchain_cursor);
332 		av_push(list, newRV_noinc((SV*)elem));
333 	}
334 
335 exit:
336 	return newRV_noinc((SV*)list);
337 }
338 
339 static void perl_process_tracepoint(struct perf_sample *sample,
340 				    struct evsel *evsel,
341 				    struct addr_location *al)
342 {
343 	struct thread *thread = al->thread;
344 	struct tep_event *event = evsel->tp_format;
345 	struct tep_format_field *field;
346 	static char handler[256];
347 	unsigned long long val;
348 	unsigned long s, ns;
349 	int pid;
350 	int cpu = sample->cpu;
351 	void *data = sample->raw_data;
352 	unsigned long long nsecs = sample->time;
353 	const char *comm = thread__comm_str(thread);
354 
355 	dSP;
356 
357 	if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
358 		return;
359 
360 	if (!event) {
361 		pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->core.attr.config);
362 		return;
363 	}
364 
365 	pid = raw_field_value(event, "common_pid", data);
366 
367 	sprintf(handler, "%s::%s", event->system, event->name);
368 
369 	if (!__test_and_set_bit(event->id, events_defined))
370 		define_event_symbols(event, handler, event->print_fmt.args);
371 
372 	s = nsecs / NSEC_PER_SEC;
373 	ns = nsecs - s * NSEC_PER_SEC;
374 
375 	ENTER;
376 	SAVETMPS;
377 	PUSHMARK(SP);
378 
379 	XPUSHs(sv_2mortal(newSVpv(handler, 0)));
380 	XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
381 	XPUSHs(sv_2mortal(newSVuv(cpu)));
382 	XPUSHs(sv_2mortal(newSVuv(s)));
383 	XPUSHs(sv_2mortal(newSVuv(ns)));
384 	XPUSHs(sv_2mortal(newSViv(pid)));
385 	XPUSHs(sv_2mortal(newSVpv(comm, 0)));
386 	XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
387 
388 	/* common fields other than pid can be accessed via xsub fns */
389 
390 	for (field = event->format.fields; field; field = field->next) {
391 		if (field->flags & TEP_FIELD_IS_STRING) {
392 			int offset;
393 			if (field->flags & TEP_FIELD_IS_DYNAMIC) {
394 				offset = *(int *)(data + field->offset);
395 				offset &= 0xffff;
396 #ifdef HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
397 				if (field->flags & TEP_FIELD_IS_RELATIVE)
398 					offset += field->offset + field->size;
399 #endif
400 			} else
401 				offset = field->offset;
402 			XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
403 		} else { /* FIELD_IS_NUMERIC */
404 			val = read_size(event, data + field->offset,
405 					field->size);
406 			if (field->flags & TEP_FIELD_IS_SIGNED) {
407 				XPUSHs(sv_2mortal(newSViv(val)));
408 			} else {
409 				XPUSHs(sv_2mortal(newSVuv(val)));
410 			}
411 		}
412 	}
413 
414 	PUTBACK;
415 
416 	if (get_cv(handler, 0))
417 		call_pv(handler, G_SCALAR);
418 	else if (get_cv("main::trace_unhandled", 0)) {
419 		XPUSHs(sv_2mortal(newSVpv(handler, 0)));
420 		XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
421 		XPUSHs(sv_2mortal(newSVuv(cpu)));
422 		XPUSHs(sv_2mortal(newSVuv(nsecs)));
423 		XPUSHs(sv_2mortal(newSViv(pid)));
424 		XPUSHs(sv_2mortal(newSVpv(comm, 0)));
425 		XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
426 		call_pv("main::trace_unhandled", G_SCALAR);
427 	}
428 	SPAGAIN;
429 	PUTBACK;
430 	FREETMPS;
431 	LEAVE;
432 }
433 
434 static void perl_process_event_generic(union perf_event *event,
435 				       struct perf_sample *sample,
436 				       struct evsel *evsel)
437 {
438 	dSP;
439 
440 	if (!get_cv("process_event", 0))
441 		return;
442 
443 	ENTER;
444 	SAVETMPS;
445 	PUSHMARK(SP);
446 	XPUSHs(sv_2mortal(newSVpvn((const char *)event, event->header.size)));
447 	XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->core.attr, sizeof(evsel->core.attr))));
448 	XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
449 	XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
450 	PUTBACK;
451 	call_pv("process_event", G_SCALAR);
452 	SPAGAIN;
453 	PUTBACK;
454 	FREETMPS;
455 	LEAVE;
456 }
457 
458 static void perl_process_event(union perf_event *event,
459 			       struct perf_sample *sample,
460 			       struct evsel *evsel,
461 			       struct addr_location *al,
462 			       struct addr_location *addr_al)
463 {
464 	scripting_context__update(scripting_context, event, sample, evsel, al, addr_al);
465 	perl_process_tracepoint(sample, evsel, al);
466 	perl_process_event_generic(event, sample, evsel);
467 }
468 
469 static void run_start_sub(void)
470 {
471 	dSP; /* access to Perl stack */
472 	PUSHMARK(SP);
473 
474 	if (get_cv("main::trace_begin", 0))
475 		call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
476 }
477 
478 /*
479  * Start trace script
480  */
481 static int perl_start_script(const char *script, int argc, const char **argv,
482 			     struct perf_session *session)
483 {
484 	const char **command_line;
485 	int i, err = 0;
486 
487 	scripting_context->session = session;
488 
489 	command_line = malloc((argc + 2) * sizeof(const char *));
490 	command_line[0] = "";
491 	command_line[1] = script;
492 	for (i = 2; i < argc + 2; i++)
493 		command_line[i] = argv[i - 2];
494 
495 	my_perl = perl_alloc();
496 	perl_construct(my_perl);
497 
498 	if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
499 		       (char **)NULL)) {
500 		err = -1;
501 		goto error;
502 	}
503 
504 	if (perl_run(my_perl)) {
505 		err = -1;
506 		goto error;
507 	}
508 
509 	if (SvTRUE(ERRSV)) {
510 		err = -1;
511 		goto error;
512 	}
513 
514 	run_start_sub();
515 
516 	free(command_line);
517 	return 0;
518 error:
519 	perl_free(my_perl);
520 	free(command_line);
521 
522 	return err;
523 }
524 
525 static int perl_flush_script(void)
526 {
527 	return 0;
528 }
529 
530 /*
531  * Stop trace script
532  */
533 static int perl_stop_script(void)
534 {
535 	dSP; /* access to Perl stack */
536 	PUSHMARK(SP);
537 
538 	if (get_cv("main::trace_end", 0))
539 		call_pv("main::trace_end", G_DISCARD | G_NOARGS);
540 
541 	perl_destruct(my_perl);
542 	perl_free(my_perl);
543 
544 	return 0;
545 }
546 
547 static int perl_generate_script(struct tep_handle *pevent, const char *outfile)
548 {
549 	int i, not_first, count, nr_events;
550 	struct tep_event **all_events;
551 	struct tep_event *event = NULL;
552 	struct tep_format_field *f;
553 	char fname[PATH_MAX];
554 	FILE *ofp;
555 
556 	sprintf(fname, "%s.pl", outfile);
557 	ofp = fopen(fname, "w");
558 	if (ofp == NULL) {
559 		fprintf(stderr, "couldn't open %s\n", fname);
560 		return -1;
561 	}
562 
563 	fprintf(ofp, "# perf script event handlers, "
564 		"generated by perf script -g perl\n");
565 
566 	fprintf(ofp, "# Licensed under the terms of the GNU GPL"
567 		" License version 2\n\n");
568 
569 	fprintf(ofp, "# The common_* event handler fields are the most useful "
570 		"fields common to\n");
571 
572 	fprintf(ofp, "# all events.  They don't necessarily correspond to "
573 		"the 'common_*' fields\n");
574 
575 	fprintf(ofp, "# in the format files.  Those fields not available as "
576 		"handler params can\n");
577 
578 	fprintf(ofp, "# be retrieved using Perl functions of the form "
579 		"common_*($context).\n");
580 
581 	fprintf(ofp, "# See Context.pm for the list of available "
582 		"functions.\n\n");
583 
584 	fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
585 		"Perf-Trace-Util/lib\";\n");
586 
587 	fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
588 	fprintf(ofp, "use Perf::Trace::Core;\n");
589 	fprintf(ofp, "use Perf::Trace::Context;\n");
590 	fprintf(ofp, "use Perf::Trace::Util;\n\n");
591 
592 	fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
593 	fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n");
594 
595 
596 	fprintf(ofp, "\n\
597 sub print_backtrace\n\
598 {\n\
599 	my $callchain = shift;\n\
600 	for my $node (@$callchain)\n\
601 	{\n\
602 		if(exists $node->{sym})\n\
603 		{\n\
604 			printf( \"\\t[\\%%x] \\%%s\\n\", $node->{ip}, $node->{sym}{name});\n\
605 		}\n\
606 		else\n\
607 		{\n\
608 			printf( \"\\t[\\%%x]\\n\", $node{ip});\n\
609 		}\n\
610 	}\n\
611 }\n\n\
612 ");
613 
614 	nr_events = tep_get_events_count(pevent);
615 	all_events = tep_list_events(pevent, TEP_EVENT_SORT_ID);
616 
617 	for (i = 0; all_events && i < nr_events; i++) {
618 		event = all_events[i];
619 		fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
620 		fprintf(ofp, "\tmy (");
621 
622 		fprintf(ofp, "$event_name, ");
623 		fprintf(ofp, "$context, ");
624 		fprintf(ofp, "$common_cpu, ");
625 		fprintf(ofp, "$common_secs, ");
626 		fprintf(ofp, "$common_nsecs,\n");
627 		fprintf(ofp, "\t    $common_pid, ");
628 		fprintf(ofp, "$common_comm, ");
629 		fprintf(ofp, "$common_callchain,\n\t    ");
630 
631 		not_first = 0;
632 		count = 0;
633 
634 		for (f = event->format.fields; f; f = f->next) {
635 			if (not_first++)
636 				fprintf(ofp, ", ");
637 			if (++count % 5 == 0)
638 				fprintf(ofp, "\n\t    ");
639 
640 			fprintf(ofp, "$%s", f->name);
641 		}
642 		fprintf(ofp, ") = @_;\n\n");
643 
644 		fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
645 			"$common_secs, $common_nsecs,\n\t             "
646 			"$common_pid, $common_comm, $common_callchain);\n\n");
647 
648 		fprintf(ofp, "\tprintf(\"");
649 
650 		not_first = 0;
651 		count = 0;
652 
653 		for (f = event->format.fields; f; f = f->next) {
654 			if (not_first++)
655 				fprintf(ofp, ", ");
656 			if (count && count % 4 == 0) {
657 				fprintf(ofp, "\".\n\t       \"");
658 			}
659 			count++;
660 
661 			fprintf(ofp, "%s=", f->name);
662 			if (f->flags & TEP_FIELD_IS_STRING ||
663 			    f->flags & TEP_FIELD_IS_FLAG ||
664 			    f->flags & TEP_FIELD_IS_SYMBOLIC)
665 				fprintf(ofp, "%%s");
666 			else if (f->flags & TEP_FIELD_IS_SIGNED)
667 				fprintf(ofp, "%%d");
668 			else
669 				fprintf(ofp, "%%u");
670 		}
671 
672 		fprintf(ofp, "\\n\",\n\t       ");
673 
674 		not_first = 0;
675 		count = 0;
676 
677 		for (f = event->format.fields; f; f = f->next) {
678 			if (not_first++)
679 				fprintf(ofp, ", ");
680 
681 			if (++count % 5 == 0)
682 				fprintf(ofp, "\n\t       ");
683 
684 			if (f->flags & TEP_FIELD_IS_FLAG) {
685 				if ((count - 1) % 5 != 0) {
686 					fprintf(ofp, "\n\t       ");
687 					count = 4;
688 				}
689 				fprintf(ofp, "flag_str(\"");
690 				fprintf(ofp, "%s::%s\", ", event->system,
691 					event->name);
692 				fprintf(ofp, "\"%s\", $%s)", f->name,
693 					f->name);
694 			} else if (f->flags & TEP_FIELD_IS_SYMBOLIC) {
695 				if ((count - 1) % 5 != 0) {
696 					fprintf(ofp, "\n\t       ");
697 					count = 4;
698 				}
699 				fprintf(ofp, "symbol_str(\"");
700 				fprintf(ofp, "%s::%s\", ", event->system,
701 					event->name);
702 				fprintf(ofp, "\"%s\", $%s)", f->name,
703 					f->name);
704 			} else
705 				fprintf(ofp, "$%s", f->name);
706 		}
707 
708 		fprintf(ofp, ");\n\n");
709 
710 		fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
711 
712 		fprintf(ofp, "}\n\n");
713 	}
714 
715 	fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
716 		"$common_cpu, $common_secs, $common_nsecs,\n\t    "
717 		"$common_pid, $common_comm, $common_callchain) = @_;\n\n");
718 
719 	fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
720 		"$common_secs, $common_nsecs,\n\t             $common_pid, "
721 		"$common_comm, $common_callchain);\n");
722 	fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
723 	fprintf(ofp, "}\n\n");
724 
725 	fprintf(ofp, "sub print_header\n{\n"
726 		"\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
727 		"\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t       "
728 		"$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
729 
730 	fprintf(ofp,
731 		"\n# Packed byte string args of process_event():\n"
732 		"#\n"
733 		"# $event:\tunion perf_event\tutil/event.h\n"
734 		"# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
735 		"# $sample:\tstruct perf_sample\tutil/event.h\n"
736 		"# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
737 		"\n"
738 		"sub process_event\n"
739 		"{\n"
740 		"\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
741 		"\n"
742 		"\tmy @event\t= unpack(\"LSS\", $event);\n"
743 		"\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
744 		"\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
745 		"\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
746 		"\n"
747 		"\tuse Data::Dumper;\n"
748 		"\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
749 		"}\n");
750 
751 	fclose(ofp);
752 
753 	fprintf(stderr, "generated Perl script: %s\n", fname);
754 
755 	return 0;
756 }
757 
758 struct scripting_ops perl_scripting_ops = {
759 	.name = "Perl",
760 	.dirname = "perl",
761 	.start_script = perl_start_script,
762 	.flush_script = perl_flush_script,
763 	.stop_script = perl_stop_script,
764 	.process_event = perl_process_event,
765 	.generate_script = perl_generate_script,
766 };
767