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Linux/tools/perf/util/scripting-engines/trace-event-perl.c

Version: ~ [ linux-5.15-rc5 ] ~ [ linux-5.14.11 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.72 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.152 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.210 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.250 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.286 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.288 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 "../../perf.h"
 38 #include "../callchain.h"
 39 #include "../machine.h"
 40 #include "../thread.h"
 41 #include "../event.h"
 42 #include "../trace-event.h"
 43 #include "../evsel.h"
 44 #include "../debug.h"
 45 
 46 void boot_Perf__Trace__Context(pTHX_ CV *cv);
 47 void boot_DynaLoader(pTHX_ CV *cv);
 48 typedef PerlInterpreter * INTERP;
 49 
 50 void xs_init(pTHX);
 51 
 52 void xs_init(pTHX)
 53 {
 54         const char *file = __FILE__;
 55         dXSUB_SYS;
 56 
 57         newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
 58               file);
 59         newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
 60 }
 61 
 62 INTERP my_perl;
 63 
 64 #define TRACE_EVENT_TYPE_MAX                            \
 65         ((1 << (sizeof(unsigned short) * 8)) - 1)
 66 
 67 static DECLARE_BITMAP(events_defined, TRACE_EVENT_TYPE_MAX);
 68 
 69 extern struct scripting_context *scripting_context;
 70 
 71 static char *cur_field_name;
 72 static int zero_flag_atom;
 73 
 74 static void define_symbolic_value(const char *ev_name,
 75                                   const char *field_name,
 76                                   const char *field_value,
 77                                   const char *field_str)
 78 {
 79         unsigned long long value;
 80         dSP;
 81 
 82         value = eval_flag(field_value);
 83 
 84         ENTER;
 85         SAVETMPS;
 86         PUSHMARK(SP);
 87 
 88         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 89         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 90         XPUSHs(sv_2mortal(newSVuv(value)));
 91         XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
 92 
 93         PUTBACK;
 94         if (get_cv("main::define_symbolic_value", 0))
 95                 call_pv("main::define_symbolic_value", G_SCALAR);
 96         SPAGAIN;
 97         PUTBACK;
 98         FREETMPS;
 99         LEAVE;
100 }
101 
102 static void define_symbolic_values(struct print_flag_sym *field,
103                                    const char *ev_name,
104                                    const char *field_name)
105 {
106         define_symbolic_value(ev_name, field_name, field->value, field->str);
107         if (field->next)
108                 define_symbolic_values(field->next, ev_name, field_name);
109 }
110 
111 static void define_symbolic_field(const char *ev_name,
112                                   const char *field_name)
113 {
114         dSP;
115 
116         ENTER;
117         SAVETMPS;
118         PUSHMARK(SP);
119 
120         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
121         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
122 
123         PUTBACK;
124         if (get_cv("main::define_symbolic_field", 0))
125                 call_pv("main::define_symbolic_field", G_SCALAR);
126         SPAGAIN;
127         PUTBACK;
128         FREETMPS;
129         LEAVE;
130 }
131 
132 static void define_flag_value(const char *ev_name,
133                               const char *field_name,
134                               const char *field_value,
135                               const char *field_str)
136 {
137         unsigned long long value;
138         dSP;
139 
140         value = eval_flag(field_value);
141 
142         ENTER;
143         SAVETMPS;
144         PUSHMARK(SP);
145 
146         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
147         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
148         XPUSHs(sv_2mortal(newSVuv(value)));
149         XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
150 
151         PUTBACK;
152         if (get_cv("main::define_flag_value", 0))
153                 call_pv("main::define_flag_value", G_SCALAR);
154         SPAGAIN;
155         PUTBACK;
156         FREETMPS;
157         LEAVE;
158 }
159 
160 static void define_flag_values(struct print_flag_sym *field,
161                                const char *ev_name,
162                                const char *field_name)
163 {
164         define_flag_value(ev_name, field_name, field->value, field->str);
165         if (field->next)
166                 define_flag_values(field->next, ev_name, field_name);
167 }
168 
169 static void define_flag_field(const char *ev_name,
170                               const char *field_name,
171                               const char *delim)
172 {
173         dSP;
174 
175         ENTER;
176         SAVETMPS;
177         PUSHMARK(SP);
178 
179         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
180         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
181         XPUSHs(sv_2mortal(newSVpv(delim, 0)));
182 
183         PUTBACK;
184         if (get_cv("main::define_flag_field", 0))
185                 call_pv("main::define_flag_field", G_SCALAR);
186         SPAGAIN;
187         PUTBACK;
188         FREETMPS;
189         LEAVE;
190 }
191 
192 static void define_event_symbols(struct event_format *event,
193                                  const char *ev_name,
194                                  struct print_arg *args)
195 {
196         if (args == NULL)
197                 return;
198 
199         switch (args->type) {
200         case PRINT_NULL:
201                 break;
202         case PRINT_ATOM:
203                 define_flag_value(ev_name, cur_field_name, "",
204                                   args->atom.atom);
205                 zero_flag_atom = 0;
206                 break;
207         case PRINT_FIELD:
208                 free(cur_field_name);
209                 cur_field_name = strdup(args->field.name);
210                 break;
211         case PRINT_FLAGS:
212                 define_event_symbols(event, ev_name, args->flags.field);
213                 define_flag_field(ev_name, cur_field_name, args->flags.delim);
214                 define_flag_values(args->flags.flags, ev_name, cur_field_name);
215                 break;
216         case PRINT_SYMBOL:
217                 define_event_symbols(event, ev_name, args->symbol.field);
218                 define_symbolic_field(ev_name, cur_field_name);
219                 define_symbolic_values(args->symbol.symbols, ev_name,
220                                        cur_field_name);
221                 break;
222         case PRINT_HEX:
223         case PRINT_HEX_STR:
224                 define_event_symbols(event, ev_name, args->hex.field);
225                 define_event_symbols(event, ev_name, args->hex.size);
226                 break;
227         case PRINT_INT_ARRAY:
228                 define_event_symbols(event, ev_name, args->int_array.field);
229                 define_event_symbols(event, ev_name, args->int_array.count);
230                 define_event_symbols(event, ev_name, args->int_array.el_size);
231                 break;
232         case PRINT_BSTRING:
233         case PRINT_DYNAMIC_ARRAY:
234         case PRINT_DYNAMIC_ARRAY_LEN:
235         case PRINT_STRING:
236         case PRINT_BITMASK:
237                 break;
238         case PRINT_TYPE:
239                 define_event_symbols(event, ev_name, args->typecast.item);
240                 break;
241         case PRINT_OP:
242                 if (strcmp(args->op.op, ":") == 0)
243                         zero_flag_atom = 1;
244                 define_event_symbols(event, ev_name, args->op.left);
245                 define_event_symbols(event, ev_name, args->op.right);
246                 break;
247         case PRINT_FUNC:
248         default:
249                 pr_err("Unsupported print arg type\n");
250                 /* we should warn... */
251                 return;
252         }
253 
254         if (args->next)
255                 define_event_symbols(event, ev_name, args->next);
256 }
257 
258 static SV *perl_process_callchain(struct perf_sample *sample,
259                                   struct perf_evsel *evsel,
260                                   struct addr_location *al)
261 {
262         AV *list;
263 
264         list = newAV();
265         if (!list)
266                 goto exit;
267 
268         if (!symbol_conf.use_callchain || !sample->callchain)
269                 goto exit;
270 
271         if (thread__resolve_callchain(al->thread, &callchain_cursor, evsel,
272                                       sample, NULL, NULL, scripting_max_stack) != 0) {
273                 pr_err("Failed to resolve callchain. Skipping\n");
274                 goto exit;
275         }
276         callchain_cursor_commit(&callchain_cursor);
277 
278 
279         while (1) {
280                 HV *elem;
281                 struct callchain_cursor_node *node;
282                 node = callchain_cursor_current(&callchain_cursor);
283                 if (!node)
284                         break;
285 
286                 elem = newHV();
287                 if (!elem)
288                         goto exit;
289 
290                 if (!hv_stores(elem, "ip", newSVuv(node->ip))) {
291                         hv_undef(elem);
292                         goto exit;
293                 }
294 
295                 if (node->sym) {
296                         HV *sym = newHV();
297                         if (!sym) {
298                                 hv_undef(elem);
299                                 goto exit;
300                         }
301                         if (!hv_stores(sym, "start",   newSVuv(node->sym->start)) ||
302                             !hv_stores(sym, "end",     newSVuv(node->sym->end)) ||
303                             !hv_stores(sym, "binding", newSVuv(node->sym->binding)) ||
304                             !hv_stores(sym, "name",    newSVpvn(node->sym->name,
305                                                                 node->sym->namelen)) ||
306                             !hv_stores(elem, "sym",    newRV_noinc((SV*)sym))) {
307                                 hv_undef(sym);
308                                 hv_undef(elem);
309                                 goto exit;
310                         }
311                 }
312 
313                 if (node->map) {
314                         struct map *map = node->map;
315                         const char *dsoname = "[unknown]";
316                         if (map && map->dso) {
317                                 if (symbol_conf.show_kernel_path && map->dso->long_name)
318                                         dsoname = map->dso->long_name;
319                                 else
320                                         dsoname = map->dso->name;
321                         }
322                         if (!hv_stores(elem, "dso", newSVpv(dsoname,0))) {
323                                 hv_undef(elem);
324                                 goto exit;
325                         }
326                 }
327 
328                 callchain_cursor_advance(&callchain_cursor);
329                 av_push(list, newRV_noinc((SV*)elem));
330         }
331 
332 exit:
333         return newRV_noinc((SV*)list);
334 }
335 
336 static void perl_process_tracepoint(struct perf_sample *sample,
337                                     struct perf_evsel *evsel,
338                                     struct addr_location *al)
339 {
340         struct thread *thread = al->thread;
341         struct event_format *event = evsel->tp_format;
342         struct format_field *field;
343         static char handler[256];
344         unsigned long long val;
345         unsigned long s, ns;
346         int pid;
347         int cpu = sample->cpu;
348         void *data = sample->raw_data;
349         unsigned long long nsecs = sample->time;
350         const char *comm = thread__comm_str(thread);
351 
352         dSP;
353 
354         if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
355                 return;
356 
357         if (!event) {
358                 pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->attr.config);
359                 return;
360         }
361 
362         pid = raw_field_value(event, "common_pid", data);
363 
364         sprintf(handler, "%s::%s", event->system, event->name);
365 
366         if (!test_and_set_bit(event->id, events_defined))
367                 define_event_symbols(event, handler, event->print_fmt.args);
368 
369         s = nsecs / NSEC_PER_SEC;
370         ns = nsecs - s * NSEC_PER_SEC;
371 
372         scripting_context->event_data = data;
373         scripting_context->pevent = evsel->tp_format->pevent;
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 & FIELD_IS_STRING) {
392                         int offset;
393                         if (field->flags & FIELD_IS_DYNAMIC) {
394                                 offset = *(int *)(data + field->offset);
395                                 offset &= 0xffff;
396                         } else
397                                 offset = field->offset;
398                         XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
399                 } else { /* FIELD_IS_NUMERIC */
400                         val = read_size(event, data + field->offset,
401                                         field->size);
402                         if (field->flags & FIELD_IS_SIGNED) {
403                                 XPUSHs(sv_2mortal(newSViv(val)));
404                         } else {
405                                 XPUSHs(sv_2mortal(newSVuv(val)));
406                         }
407                 }
408         }
409 
410         PUTBACK;
411 
412         if (get_cv(handler, 0))
413                 call_pv(handler, G_SCALAR);
414         else if (get_cv("main::trace_unhandled", 0)) {
415                 XPUSHs(sv_2mortal(newSVpv(handler, 0)));
416                 XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
417                 XPUSHs(sv_2mortal(newSVuv(cpu)));
418                 XPUSHs(sv_2mortal(newSVuv(nsecs)));
419                 XPUSHs(sv_2mortal(newSViv(pid)));
420                 XPUSHs(sv_2mortal(newSVpv(comm, 0)));
421                 XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
422                 call_pv("main::trace_unhandled", G_SCALAR);
423         }
424         SPAGAIN;
425         PUTBACK;
426         FREETMPS;
427         LEAVE;
428 }
429 
430 static void perl_process_event_generic(union perf_event *event,
431                                        struct perf_sample *sample,
432                                        struct perf_evsel *evsel)
433 {
434         dSP;
435 
436         if (!get_cv("process_event", 0))
437                 return;
438 
439         ENTER;
440         SAVETMPS;
441         PUSHMARK(SP);
442         XPUSHs(sv_2mortal(newSVpvn((const char *)event, event->header.size)));
443         XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->attr, sizeof(evsel->attr))));
444         XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
445         XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
446         PUTBACK;
447         call_pv("process_event", G_SCALAR);
448         SPAGAIN;
449         PUTBACK;
450         FREETMPS;
451         LEAVE;
452 }
453 
454 static void perl_process_event(union perf_event *event,
455                                struct perf_sample *sample,
456                                struct perf_evsel *evsel,
457                                struct addr_location *al)
458 {
459         perl_process_tracepoint(sample, evsel, al);
460         perl_process_event_generic(event, sample, evsel);
461 }
462 
463 static void run_start_sub(void)
464 {
465         dSP; /* access to Perl stack */
466         PUSHMARK(SP);
467 
468         if (get_cv("main::trace_begin", 0))
469                 call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
470 }
471 
472 /*
473  * Start trace script
474  */
475 static int perl_start_script(const char *script, int argc, const char **argv)
476 {
477         const char **command_line;
478         int i, err = 0;
479 
480         command_line = malloc((argc + 2) * sizeof(const char *));
481         command_line[0] = "";
482         command_line[1] = script;
483         for (i = 2; i < argc + 2; i++)
484                 command_line[i] = argv[i - 2];
485 
486         my_perl = perl_alloc();
487         perl_construct(my_perl);
488 
489         if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
490                        (char **)NULL)) {
491                 err = -1;
492                 goto error;
493         }
494 
495         if (perl_run(my_perl)) {
496                 err = -1;
497                 goto error;
498         }
499 
500         if (SvTRUE(ERRSV)) {
501                 err = -1;
502                 goto error;
503         }
504 
505         run_start_sub();
506 
507         free(command_line);
508         return 0;
509 error:
510         perl_free(my_perl);
511         free(command_line);
512 
513         return err;
514 }
515 
516 static int perl_flush_script(void)
517 {
518         return 0;
519 }
520 
521 /*
522  * Stop trace script
523  */
524 static int perl_stop_script(void)
525 {
526         dSP; /* access to Perl stack */
527         PUSHMARK(SP);
528 
529         if (get_cv("main::trace_end", 0))
530                 call_pv("main::trace_end", G_DISCARD | G_NOARGS);
531 
532         perl_destruct(my_perl);
533         perl_free(my_perl);
534 
535         return 0;
536 }
537 
538 static int perl_generate_script(struct pevent *pevent, const char *outfile)
539 {
540         struct event_format *event = NULL;
541         struct format_field *f;
542         char fname[PATH_MAX];
543         int not_first, count;
544         FILE *ofp;
545 
546         sprintf(fname, "%s.pl", outfile);
547         ofp = fopen(fname, "w");
548         if (ofp == NULL) {
549                 fprintf(stderr, "couldn't open %s\n", fname);
550                 return -1;
551         }
552 
553         fprintf(ofp, "# perf script event handlers, "
554                 "generated by perf script -g perl\n");
555 
556         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
557                 " License version 2\n\n");
558 
559         fprintf(ofp, "# The common_* event handler fields are the most useful "
560                 "fields common to\n");
561 
562         fprintf(ofp, "# all events.  They don't necessarily correspond to "
563                 "the 'common_*' fields\n");
564 
565         fprintf(ofp, "# in the format files.  Those fields not available as "
566                 "handler params can\n");
567 
568         fprintf(ofp, "# be retrieved using Perl functions of the form "
569                 "common_*($context).\n");
570 
571         fprintf(ofp, "# See Context.pm for the list of available "
572                 "functions.\n\n");
573 
574         fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
575                 "Perf-Trace-Util/lib\";\n");
576 
577         fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
578         fprintf(ofp, "use Perf::Trace::Core;\n");
579         fprintf(ofp, "use Perf::Trace::Context;\n");
580         fprintf(ofp, "use Perf::Trace::Util;\n\n");
581 
582         fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
583         fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n");
584 
585 
586         fprintf(ofp, "\n\
587 sub print_backtrace\n\
588 {\n\
589         my $callchain = shift;\n\
590         for my $node (@$callchain)\n\
591         {\n\
592                 if(exists $node->{sym})\n\
593                 {\n\
594                         printf( \"\\t[\\%%x] \\%%s\\n\", $node->{ip}, $node->{sym}{name});\n\
595                 }\n\
596                 else\n\
597                 {\n\
598                         printf( \"\\t[\\%%x]\\n\", $node{ip});\n\
599                 }\n\
600         }\n\
601 }\n\n\
602 ");
603 
604 
605         while ((event = trace_find_next_event(pevent, event))) {
606                 fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
607                 fprintf(ofp, "\tmy (");
608 
609                 fprintf(ofp, "$event_name, ");
610                 fprintf(ofp, "$context, ");
611                 fprintf(ofp, "$common_cpu, ");
612                 fprintf(ofp, "$common_secs, ");
613                 fprintf(ofp, "$common_nsecs,\n");
614                 fprintf(ofp, "\t    $common_pid, ");
615                 fprintf(ofp, "$common_comm, ");
616                 fprintf(ofp, "$common_callchain,\n\t    ");
617 
618                 not_first = 0;
619                 count = 0;
620 
621                 for (f = event->format.fields; f; f = f->next) {
622                         if (not_first++)
623                                 fprintf(ofp, ", ");
624                         if (++count % 5 == 0)
625                                 fprintf(ofp, "\n\t    ");
626 
627                         fprintf(ofp, "$%s", f->name);
628                 }
629                 fprintf(ofp, ") = @_;\n\n");
630 
631                 fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
632                         "$common_secs, $common_nsecs,\n\t             "
633                         "$common_pid, $common_comm, $common_callchain);\n\n");
634 
635                 fprintf(ofp, "\tprintf(\"");
636 
637                 not_first = 0;
638                 count = 0;
639 
640                 for (f = event->format.fields; f; f = f->next) {
641                         if (not_first++)
642                                 fprintf(ofp, ", ");
643                         if (count && count % 4 == 0) {
644                                 fprintf(ofp, "\".\n\t       \"");
645                         }
646                         count++;
647 
648                         fprintf(ofp, "%s=", f->name);
649                         if (f->flags & FIELD_IS_STRING ||
650                             f->flags & FIELD_IS_FLAG ||
651                             f->flags & FIELD_IS_SYMBOLIC)
652                                 fprintf(ofp, "%%s");
653                         else if (f->flags & FIELD_IS_SIGNED)
654                                 fprintf(ofp, "%%d");
655                         else
656                                 fprintf(ofp, "%%u");
657                 }
658 
659                 fprintf(ofp, "\\n\",\n\t       ");
660 
661                 not_first = 0;
662                 count = 0;
663 
664                 for (f = event->format.fields; f; f = f->next) {
665                         if (not_first++)
666                                 fprintf(ofp, ", ");
667 
668                         if (++count % 5 == 0)
669                                 fprintf(ofp, "\n\t       ");
670 
671                         if (f->flags & FIELD_IS_FLAG) {
672                                 if ((count - 1) % 5 != 0) {
673                                         fprintf(ofp, "\n\t       ");
674                                         count = 4;
675                                 }
676                                 fprintf(ofp, "flag_str(\"");
677                                 fprintf(ofp, "%s::%s\", ", event->system,
678                                         event->name);
679                                 fprintf(ofp, "\"%s\", $%s)", f->name,
680                                         f->name);
681                         } else if (f->flags & FIELD_IS_SYMBOLIC) {
682                                 if ((count - 1) % 5 != 0) {
683                                         fprintf(ofp, "\n\t       ");
684                                         count = 4;
685                                 }
686                                 fprintf(ofp, "symbol_str(\"");
687                                 fprintf(ofp, "%s::%s\", ", event->system,
688                                         event->name);
689                                 fprintf(ofp, "\"%s\", $%s)", f->name,
690                                         f->name);
691                         } else
692                                 fprintf(ofp, "$%s", f->name);
693                 }
694 
695                 fprintf(ofp, ");\n\n");
696 
697                 fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
698 
699                 fprintf(ofp, "}\n\n");
700         }
701 
702         fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
703                 "$common_cpu, $common_secs, $common_nsecs,\n\t    "
704                 "$common_pid, $common_comm, $common_callchain) = @_;\n\n");
705 
706         fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
707                 "$common_secs, $common_nsecs,\n\t             $common_pid, "
708                 "$common_comm, $common_callchain);\n");
709         fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
710         fprintf(ofp, "}\n\n");
711 
712         fprintf(ofp, "sub print_header\n{\n"
713                 "\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
714                 "\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t       "
715                 "$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
716 
717         fprintf(ofp,
718                 "\n# Packed byte string args of process_event():\n"
719                 "#\n"
720                 "# $event:\tunion perf_event\tutil/event.h\n"
721                 "# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
722                 "# $sample:\tstruct perf_sample\tutil/event.h\n"
723                 "# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
724                 "\n"
725                 "sub process_event\n"
726                 "{\n"
727                 "\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
728                 "\n"
729                 "\tmy @event\t= unpack(\"LSS\", $event);\n"
730                 "\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
731                 "\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
732                 "\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
733                 "\n"
734                 "\tuse Data::Dumper;\n"
735                 "\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
736                 "}\n");
737 
738         fclose(ofp);
739 
740         fprintf(stderr, "generated Perl script: %s\n", fname);
741 
742         return 0;
743 }
744 
745 struct scripting_ops perl_scripting_ops = {
746         .name = "Perl",
747         .start_script = perl_start_script,
748         .flush_script = perl_flush_script,
749         .stop_script = perl_stop_script,
750         .process_event = perl_process_event,
751         .generate_script = perl_generate_script,
752 };
753 

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