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

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