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 extern struct scripting_context *scripting_context;
71 
72 static char *cur_field_name;
73 static int zero_flag_atom;
74 
75 static void define_symbolic_value(const char *ev_name,
76 				  const char *field_name,
77 				  const char *field_value,
78 				  const char *field_str)
79 {
80 	unsigned long long value;
81 	dSP;
82 
83 	value = eval_flag(field_value);
84 
85 	ENTER;
86 	SAVETMPS;
87 	PUSHMARK(SP);
88 
89 	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
90 	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
91 	XPUSHs(sv_2mortal(newSVuv(value)));
92 	XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
93 
94 	PUTBACK;
95 	if (get_cv("main::define_symbolic_value", 0))
96 		call_pv("main::define_symbolic_value", G_SCALAR);
97 	SPAGAIN;
98 	PUTBACK;
99 	FREETMPS;
100 	LEAVE;
101 }
102 
103 static void define_symbolic_values(struct tep_print_flag_sym *field,
104 				   const char *ev_name,
105 				   const char *field_name)
106 {
107 	define_symbolic_value(ev_name, field_name, field->value, field->str);
108 	if (field->next)
109 		define_symbolic_values(field->next, ev_name, field_name);
110 }
111 
112 static void define_symbolic_field(const char *ev_name,
113 				  const char *field_name)
114 {
115 	dSP;
116 
117 	ENTER;
118 	SAVETMPS;
119 	PUSHMARK(SP);
120 
121 	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
122 	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
123 
124 	PUTBACK;
125 	if (get_cv("main::define_symbolic_field", 0))
126 		call_pv("main::define_symbolic_field", G_SCALAR);
127 	SPAGAIN;
128 	PUTBACK;
129 	FREETMPS;
130 	LEAVE;
131 }
132 
133 static void define_flag_value(const char *ev_name,
134 			      const char *field_name,
135 			      const char *field_value,
136 			      const char *field_str)
137 {
138 	unsigned long long value;
139 	dSP;
140 
141 	value = eval_flag(field_value);
142 
143 	ENTER;
144 	SAVETMPS;
145 	PUSHMARK(SP);
146 
147 	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
148 	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
149 	XPUSHs(sv_2mortal(newSVuv(value)));
150 	XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
151 
152 	PUTBACK;
153 	if (get_cv("main::define_flag_value", 0))
154 		call_pv("main::define_flag_value", G_SCALAR);
155 	SPAGAIN;
156 	PUTBACK;
157 	FREETMPS;
158 	LEAVE;
159 }
160 
161 static void define_flag_values(struct tep_print_flag_sym *field,
162 			       const char *ev_name,
163 			       const char *field_name)
164 {
165 	define_flag_value(ev_name, field_name, field->value, field->str);
166 	if (field->next)
167 		define_flag_values(field->next, ev_name, field_name);
168 }
169 
170 static void define_flag_field(const char *ev_name,
171 			      const char *field_name,
172 			      const char *delim)
173 {
174 	dSP;
175 
176 	ENTER;
177 	SAVETMPS;
178 	PUSHMARK(SP);
179 
180 	XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
181 	XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
182 	XPUSHs(sv_2mortal(newSVpv(delim, 0)));
183 
184 	PUTBACK;
185 	if (get_cv("main::define_flag_field", 0))
186 		call_pv("main::define_flag_field", G_SCALAR);
187 	SPAGAIN;
188 	PUTBACK;
189 	FREETMPS;
190 	LEAVE;
191 }
192 
193 static void define_event_symbols(struct tep_event *event,
194 				 const char *ev_name,
195 				 struct tep_print_arg *args)
196 {
197 	if (args == NULL)
198 		return;
199 
200 	switch (args->type) {
201 	case TEP_PRINT_NULL:
202 		break;
203 	case TEP_PRINT_ATOM:
204 		define_flag_value(ev_name, cur_field_name, "0",
205 				  args->atom.atom);
206 		zero_flag_atom = 0;
207 		break;
208 	case TEP_PRINT_FIELD:
209 		free(cur_field_name);
210 		cur_field_name = strdup(args->field.name);
211 		break;
212 	case TEP_PRINT_FLAGS:
213 		define_event_symbols(event, ev_name, args->flags.field);
214 		define_flag_field(ev_name, cur_field_name, args->flags.delim);
215 		define_flag_values(args->flags.flags, ev_name, cur_field_name);
216 		break;
217 	case TEP_PRINT_SYMBOL:
218 		define_event_symbols(event, ev_name, args->symbol.field);
219 		define_symbolic_field(ev_name, cur_field_name);
220 		define_symbolic_values(args->symbol.symbols, ev_name,
221 				       cur_field_name);
222 		break;
223 	case TEP_PRINT_HEX:
224 	case TEP_PRINT_HEX_STR:
225 		define_event_symbols(event, ev_name, args->hex.field);
226 		define_event_symbols(event, ev_name, args->hex.size);
227 		break;
228 	case TEP_PRINT_INT_ARRAY:
229 		define_event_symbols(event, ev_name, args->int_array.field);
230 		define_event_symbols(event, ev_name, args->int_array.count);
231 		define_event_symbols(event, ev_name, args->int_array.el_size);
232 		break;
233 	case TEP_PRINT_BSTRING:
234 	case TEP_PRINT_DYNAMIC_ARRAY:
235 	case TEP_PRINT_DYNAMIC_ARRAY_LEN:
236 	case TEP_PRINT_STRING:
237 	case TEP_PRINT_BITMASK:
238 		break;
239 	case TEP_PRINT_TYPE:
240 		define_event_symbols(event, ev_name, args->typecast.item);
241 		break;
242 	case TEP_PRINT_OP:
243 		if (strcmp(args->op.op, ":") == 0)
244 			zero_flag_atom = 1;
245 		define_event_symbols(event, ev_name, args->op.left);
246 		define_event_symbols(event, ev_name, args->op.right);
247 		break;
248 	case TEP_PRINT_FUNC:
249 	default:
250 		pr_err("Unsupported print arg type\n");
251 		/* we should warn... */
252 		return;
253 	}
254 
255 	if (args->next)
256 		define_event_symbols(event, ev_name, args->next);
257 }
258 
259 static SV *perl_process_callchain(struct perf_sample *sample,
260 				  struct evsel *evsel,
261 				  struct addr_location *al)
262 {
263 	struct callchain_cursor *cursor;
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 	cursor = get_tls_callchain_cursor();
274 
275 	if (thread__resolve_callchain(al->thread, cursor, evsel,
276 				      sample, NULL, NULL, scripting_max_stack) != 0) {
277 		pr_err("Failed to resolve callchain. Skipping\n");
278 		goto exit;
279 	}
280 	callchain_cursor_commit(cursor);
281 
282 
283 	while (1) {
284 		HV *elem;
285 		struct callchain_cursor_node *node;
286 		node = callchain_cursor_current(cursor);
287 		if (!node)
288 			break;
289 
290 		elem = newHV();
291 		if (!elem)
292 			goto exit;
293 
294 		if (!hv_stores(elem, "ip", newSVuv(node->ip))) {
295 			hv_undef(elem);
296 			goto exit;
297 		}
298 
299 		if (node->ms.sym) {
300 			HV *sym = newHV();
301 			if (!sym) {
302 				hv_undef(elem);
303 				goto exit;
304 			}
305 			if (!hv_stores(sym, "start",   newSVuv(node->ms.sym->start)) ||
306 			    !hv_stores(sym, "end",     newSVuv(node->ms.sym->end)) ||
307 			    !hv_stores(sym, "binding", newSVuv(node->ms.sym->binding)) ||
308 			    !hv_stores(sym, "name",    newSVpvn(node->ms.sym->name,
309 								node->ms.sym->namelen)) ||
310 			    !hv_stores(elem, "sym",    newRV_noinc((SV*)sym))) {
311 				hv_undef(sym);
312 				hv_undef(elem);
313 				goto exit;
314 			}
315 		}
316 
317 		if (node->ms.map) {
318 			struct map *map = node->ms.map;
319 			struct dso *dso = map ? map__dso(map) : NULL;
320 			const char *dsoname = "[unknown]";
321 
322 			if (dso) {
323 				if (symbol_conf.show_kernel_path && dso->long_name)
324 					dsoname = dso->long_name;
325 				else
326 					dsoname = dso->name;
327 			}
328 			if (!hv_stores(elem, "dso", newSVpv(dsoname,0))) {
329 				hv_undef(elem);
330 				goto exit;
331 			}
332 		}
333 
334 		callchain_cursor_advance(cursor);
335 		av_push(list, newRV_noinc((SV*)elem));
336 	}
337 
338 exit:
339 	return newRV_noinc((SV*)list);
340 }
341 
342 static void perl_process_tracepoint(struct perf_sample *sample,
343 				    struct evsel *evsel,
344 				    struct addr_location *al)
345 {
346 	struct thread *thread = al->thread;
347 	struct tep_event *event = evsel->tp_format;
348 	struct tep_format_field *field;
349 	static char handler[256];
350 	unsigned long long val;
351 	unsigned long s, ns;
352 	int pid;
353 	int cpu = sample->cpu;
354 	void *data = sample->raw_data;
355 	unsigned long long nsecs = sample->time;
356 	const char *comm = thread__comm_str(thread);
357 	DECLARE_BITMAP(events_defined, TRACE_EVENT_TYPE_MAX);
358 
359 	bitmap_zero(events_defined, TRACE_EVENT_TYPE_MAX);
360 	dSP;
361 
362 	if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
363 		return;
364 
365 	if (!event) {
366 		pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->core.attr.config);
367 		return;
368 	}
369 
370 	pid = raw_field_value(event, "common_pid", data);
371 
372 	sprintf(handler, "%s::%s", event->system, event->name);
373 
374 	if (!__test_and_set_bit(event->id, events_defined))
375 		define_event_symbols(event, handler, event->print_fmt.args);
376 
377 	s = nsecs / NSEC_PER_SEC;
378 	ns = nsecs - s * NSEC_PER_SEC;
379 
380 	ENTER;
381 	SAVETMPS;
382 	PUSHMARK(SP);
383 
384 	XPUSHs(sv_2mortal(newSVpv(handler, 0)));
385 	XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
386 	XPUSHs(sv_2mortal(newSVuv(cpu)));
387 	XPUSHs(sv_2mortal(newSVuv(s)));
388 	XPUSHs(sv_2mortal(newSVuv(ns)));
389 	XPUSHs(sv_2mortal(newSViv(pid)));
390 	XPUSHs(sv_2mortal(newSVpv(comm, 0)));
391 	XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
392 
393 	/* common fields other than pid can be accessed via xsub fns */
394 
395 	for (field = event->format.fields; field; field = field->next) {
396 		if (field->flags & TEP_FIELD_IS_STRING) {
397 			int offset;
398 			if (field->flags & TEP_FIELD_IS_DYNAMIC) {
399 				offset = *(int *)(data + field->offset);
400 				offset &= 0xffff;
401 				if (tep_field_is_relative(field->flags))
402 					offset += field->offset + field->size;
403 			} else
404 				offset = field->offset;
405 			XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
406 		} else { /* FIELD_IS_NUMERIC */
407 			val = read_size(event, data + field->offset,
408 					field->size);
409 			if (field->flags & TEP_FIELD_IS_SIGNED) {
410 				XPUSHs(sv_2mortal(newSViv(val)));
411 			} else {
412 				XPUSHs(sv_2mortal(newSVuv(val)));
413 			}
414 		}
415 	}
416 
417 	PUTBACK;
418 
419 	if (get_cv(handler, 0))
420 		call_pv(handler, G_SCALAR);
421 	else if (get_cv("main::trace_unhandled", 0)) {
422 		XPUSHs(sv_2mortal(newSVpv(handler, 0)));
423 		XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
424 		XPUSHs(sv_2mortal(newSVuv(cpu)));
425 		XPUSHs(sv_2mortal(newSVuv(nsecs)));
426 		XPUSHs(sv_2mortal(newSViv(pid)));
427 		XPUSHs(sv_2mortal(newSVpv(comm, 0)));
428 		XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
429 		call_pv("main::trace_unhandled", G_SCALAR);
430 	}
431 	SPAGAIN;
432 	PUTBACK;
433 	FREETMPS;
434 	LEAVE;
435 }
436 
437 static void perl_process_event_generic(union perf_event *event,
438 				       struct perf_sample *sample,
439 				       struct evsel *evsel)
440 {
441 	dSP;
442 
443 	if (!get_cv("process_event", 0))
444 		return;
445 
446 	ENTER;
447 	SAVETMPS;
448 	PUSHMARK(SP);
449 	XPUSHs(sv_2mortal(newSVpvn((const char *)event, event->header.size)));
450 	XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->core.attr, sizeof(evsel->core.attr))));
451 	XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
452 	XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
453 	PUTBACK;
454 	call_pv("process_event", G_SCALAR);
455 	SPAGAIN;
456 	PUTBACK;
457 	FREETMPS;
458 	LEAVE;
459 }
460 
461 static void perl_process_event(union perf_event *event,
462 			       struct perf_sample *sample,
463 			       struct evsel *evsel,
464 			       struct addr_location *al,
465 			       struct addr_location *addr_al)
466 {
467 	scripting_context__update(scripting_context, event, sample, evsel, al, addr_al);
468 	perl_process_tracepoint(sample, evsel, al);
469 	perl_process_event_generic(event, sample, evsel);
470 }
471 
472 static void run_start_sub(void)
473 {
474 	dSP; /* access to Perl stack */
475 	PUSHMARK(SP);
476 
477 	if (get_cv("main::trace_begin", 0))
478 		call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
479 }
480 
481 /*
482  * Start trace script
483  */
484 static int perl_start_script(const char *script, int argc, const char **argv,
485 			     struct perf_session *session)
486 {
487 	const char **command_line;
488 	int i, err = 0;
489 
490 	scripting_context->session = session;
491 
492 	command_line = malloc((argc + 2) * sizeof(const char *));
493 	command_line[0] = "";
494 	command_line[1] = script;
495 	for (i = 2; i < argc + 2; i++)
496 		command_line[i] = argv[i - 2];
497 
498 	my_perl = perl_alloc();
499 	perl_construct(my_perl);
500 
501 	if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
502 		       (char **)NULL)) {
503 		err = -1;
504 		goto error;
505 	}
506 
507 	if (perl_run(my_perl)) {
508 		err = -1;
509 		goto error;
510 	}
511 
512 	if (SvTRUE(ERRSV)) {
513 		err = -1;
514 		goto error;
515 	}
516 
517 	run_start_sub();
518 
519 	free(command_line);
520 	return 0;
521 error:
522 	perl_free(my_perl);
523 	free(command_line);
524 
525 	return err;
526 }
527 
528 static int perl_flush_script(void)
529 {
530 	return 0;
531 }
532 
533 /*
534  * Stop trace script
535  */
536 static int perl_stop_script(void)
537 {
538 	dSP; /* access to Perl stack */
539 	PUSHMARK(SP);
540 
541 	if (get_cv("main::trace_end", 0))
542 		call_pv("main::trace_end", G_DISCARD | G_NOARGS);
543 
544 	perl_destruct(my_perl);
545 	perl_free(my_perl);
546 
547 	return 0;
548 }
549 
550 static int perl_generate_script(struct tep_handle *pevent, const char *outfile)
551 {
552 	int i, not_first, count, nr_events;
553 	struct tep_event **all_events;
554 	struct tep_event *event = NULL;
555 	struct tep_format_field *f;
556 	char fname[PATH_MAX];
557 	FILE *ofp;
558 
559 	sprintf(fname, "%s.pl", outfile);
560 	ofp = fopen(fname, "w");
561 	if (ofp == NULL) {
562 		fprintf(stderr, "couldn't open %s\n", fname);
563 		return -1;
564 	}
565 
566 	fprintf(ofp, "# perf script event handlers, "
567 		"generated by perf script -g perl\n");
568 
569 	fprintf(ofp, "# Licensed under the terms of the GNU GPL"
570 		" License version 2\n\n");
571 
572 	fprintf(ofp, "# The common_* event handler fields are the most useful "
573 		"fields common to\n");
574 
575 	fprintf(ofp, "# all events.  They don't necessarily correspond to "
576 		"the 'common_*' fields\n");
577 
578 	fprintf(ofp, "# in the format files.  Those fields not available as "
579 		"handler params can\n");
580 
581 	fprintf(ofp, "# be retrieved using Perl functions of the form "
582 		"common_*($context).\n");
583 
584 	fprintf(ofp, "# See Context.pm for the list of available "
585 		"functions.\n\n");
586 
587 	fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
588 		"Perf-Trace-Util/lib\";\n");
589 
590 	fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
591 	fprintf(ofp, "use Perf::Trace::Core;\n");
592 	fprintf(ofp, "use Perf::Trace::Context;\n");
593 	fprintf(ofp, "use Perf::Trace::Util;\n\n");
594 
595 	fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
596 	fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n");
597 
598 
599 	fprintf(ofp, "\n\
600 sub print_backtrace\n\
601 {\n\
602 	my $callchain = shift;\n\
603 	for my $node (@$callchain)\n\
604 	{\n\
605 		if(exists $node->{sym})\n\
606 		{\n\
607 			printf( \"\\t[\\%%x] \\%%s\\n\", $node->{ip}, $node->{sym}{name});\n\
608 		}\n\
609 		else\n\
610 		{\n\
611 			printf( \"\\t[\\%%x]\\n\", $node{ip});\n\
612 		}\n\
613 	}\n\
614 }\n\n\
615 ");
616 
617 	nr_events = tep_get_events_count(pevent);
618 	all_events = tep_list_events(pevent, TEP_EVENT_SORT_ID);
619 
620 	for (i = 0; all_events && i < nr_events; i++) {
621 		event = all_events[i];
622 		fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
623 		fprintf(ofp, "\tmy (");
624 
625 		fprintf(ofp, "$event_name, ");
626 		fprintf(ofp, "$context, ");
627 		fprintf(ofp, "$common_cpu, ");
628 		fprintf(ofp, "$common_secs, ");
629 		fprintf(ofp, "$common_nsecs,\n");
630 		fprintf(ofp, "\t    $common_pid, ");
631 		fprintf(ofp, "$common_comm, ");
632 		fprintf(ofp, "$common_callchain,\n\t    ");
633 
634 		not_first = 0;
635 		count = 0;
636 
637 		for (f = event->format.fields; f; f = f->next) {
638 			if (not_first++)
639 				fprintf(ofp, ", ");
640 			if (++count % 5 == 0)
641 				fprintf(ofp, "\n\t    ");
642 
643 			fprintf(ofp, "$%s", f->name);
644 		}
645 		fprintf(ofp, ") = @_;\n\n");
646 
647 		fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
648 			"$common_secs, $common_nsecs,\n\t             "
649 			"$common_pid, $common_comm, $common_callchain);\n\n");
650 
651 		fprintf(ofp, "\tprintf(\"");
652 
653 		not_first = 0;
654 		count = 0;
655 
656 		for (f = event->format.fields; f; f = f->next) {
657 			if (not_first++)
658 				fprintf(ofp, ", ");
659 			if (count && count % 4 == 0) {
660 				fprintf(ofp, "\".\n\t       \"");
661 			}
662 			count++;
663 
664 			fprintf(ofp, "%s=", f->name);
665 			if (f->flags & TEP_FIELD_IS_STRING ||
666 			    f->flags & TEP_FIELD_IS_FLAG ||
667 			    f->flags & TEP_FIELD_IS_SYMBOLIC)
668 				fprintf(ofp, "%%s");
669 			else if (f->flags & TEP_FIELD_IS_SIGNED)
670 				fprintf(ofp, "%%d");
671 			else
672 				fprintf(ofp, "%%u");
673 		}
674 
675 		fprintf(ofp, "\\n\",\n\t       ");
676 
677 		not_first = 0;
678 		count = 0;
679 
680 		for (f = event->format.fields; f; f = f->next) {
681 			if (not_first++)
682 				fprintf(ofp, ", ");
683 
684 			if (++count % 5 == 0)
685 				fprintf(ofp, "\n\t       ");
686 
687 			if (f->flags & TEP_FIELD_IS_FLAG) {
688 				if ((count - 1) % 5 != 0) {
689 					fprintf(ofp, "\n\t       ");
690 					count = 4;
691 				}
692 				fprintf(ofp, "flag_str(\"");
693 				fprintf(ofp, "%s::%s\", ", event->system,
694 					event->name);
695 				fprintf(ofp, "\"%s\", $%s)", f->name,
696 					f->name);
697 			} else if (f->flags & TEP_FIELD_IS_SYMBOLIC) {
698 				if ((count - 1) % 5 != 0) {
699 					fprintf(ofp, "\n\t       ");
700 					count = 4;
701 				}
702 				fprintf(ofp, "symbol_str(\"");
703 				fprintf(ofp, "%s::%s\", ", event->system,
704 					event->name);
705 				fprintf(ofp, "\"%s\", $%s)", f->name,
706 					f->name);
707 			} else
708 				fprintf(ofp, "$%s", f->name);
709 		}
710 
711 		fprintf(ofp, ");\n\n");
712 
713 		fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
714 
715 		fprintf(ofp, "}\n\n");
716 	}
717 
718 	fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
719 		"$common_cpu, $common_secs, $common_nsecs,\n\t    "
720 		"$common_pid, $common_comm, $common_callchain) = @_;\n\n");
721 
722 	fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
723 		"$common_secs, $common_nsecs,\n\t             $common_pid, "
724 		"$common_comm, $common_callchain);\n");
725 	fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
726 	fprintf(ofp, "}\n\n");
727 
728 	fprintf(ofp, "sub print_header\n{\n"
729 		"\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
730 		"\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t       "
731 		"$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
732 
733 	fprintf(ofp,
734 		"\n# Packed byte string args of process_event():\n"
735 		"#\n"
736 		"# $event:\tunion perf_event\tutil/event.h\n"
737 		"# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
738 		"# $sample:\tstruct perf_sample\tutil/event.h\n"
739 		"# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
740 		"\n"
741 		"sub process_event\n"
742 		"{\n"
743 		"\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
744 		"\n"
745 		"\tmy @event\t= unpack(\"LSS\", $event);\n"
746 		"\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
747 		"\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
748 		"\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
749 		"\n"
750 		"\tuse Data::Dumper;\n"
751 		"\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
752 		"}\n");
753 
754 	fclose(ofp);
755 
756 	fprintf(stderr, "generated Perl script: %s\n", fname);
757 
758 	return 0;
759 }
760 
761 struct scripting_ops perl_scripting_ops = {
762 	.name = "Perl",
763 	.dirname = "perl",
764 	.start_script = perl_start_script,
765 	.flush_script = perl_flush_script,
766 	.stop_script = perl_stop_script,
767 	.process_event = perl_process_event,
768 	.generate_script = perl_generate_script,
769 };
770