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 <[email protected]>
   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         case PRINT_HEX_STR:
 221                 define_event_symbols(event, ev_name, args->hex.field);
 222                 define_event_symbols(event, ev_name, args->hex.size);
 223                 break;
 224         case PRINT_INT_ARRAY:
 225                 define_event_symbols(event, ev_name, args->int_array.field);
 226                 define_event_symbols(event, ev_name, args->int_array.count);
 227                 define_event_symbols(event, ev_name, args->int_array.el_size);
 228                 break;
 229         case PRINT_BSTRING:
 230         case PRINT_DYNAMIC_ARRAY:
 231         case PRINT_DYNAMIC_ARRAY_LEN:
 232         case PRINT_STRING:
 233         case PRINT_BITMASK:
 234                 break;
 235         case PRINT_TYPE:
 236                 define_event_symbols(event, ev_name, args->typecast.item);
 237                 break;
 238         case PRINT_OP:
 239                 if (strcmp(args->op.op, ":") == 0)
 240                         zero_flag_atom = 1;
 241                 define_event_symbols(event, ev_name, args->op.left);
 242                 define_event_symbols(event, ev_name, args->op.right);
 243                 break;
 244         case PRINT_FUNC:
 245         default:
 246                 pr_err("Unsupported print arg type\n");
 247                 /* we should warn... */
 248                 return;
 249         }
 250
 251         if (args->next)
 252                 define_event_symbols(event, ev_name, args->next);
 253 }
 254
 255 static SV *perl_process_callchain(struct perf_sample *sample,
 256                                   struct perf_evsel *evsel,
 257                                   struct addr_location *al)
 258 {
 259         AV *list;
 260
 261         list = newAV();
 262         if (!list)
 263                 goto exit;
 264
 265         if (!symbol_conf.use_callchain || !sample->callchain)
 266                 goto exit;
 267
 268         if (thread__resolve_callchain(al->thread, &callchain_cursor, evsel,
 269                                       sample, NULL, NULL, scripting_max_stack) != 0) {
 270                 pr_err("Failed to resolve callchain. Skipping\n");
 271                 goto exit;
 272         }
 273         callchain_cursor_commit(&callchain_cursor);
 274
 275
 276         while (1) {
 277                 HV *elem;
 278                 struct callchain_cursor_node *node;
 279                 node = callchain_cursor_current(&callchain_cursor);
 280                 if (!node)
 281                         break;
 282
 283                 elem = newHV();
 284                 if (!elem)
 285                         goto exit;
 286
 287                 if (!hv_stores(elem, "ip", newSVuv(node->ip))) {
 288                         hv_undef(elem);
 289                         goto exit;
 290                 }
 291
 292                 if (node->sym) {
 293                         HV *sym = newHV();
 294                         if (!sym) {
 295                                 hv_undef(elem);
 296                                 goto exit;
 297                         }
 298                         if (!hv_stores(sym, "start",   newSVuv(node->sym->start)) ||
 299                             !hv_stores(sym, "end",     newSVuv(node->sym->end)) ||
 300                             !hv_stores(sym, "binding", newSVuv(node->sym->binding)) ||
 301                             !hv_stores(sym, "name",    newSVpvn(node->sym->name,
 302                                                                 node->sym->namelen)) ||
 303                             !hv_stores(elem, "sym",    newRV_noinc((SV*)sym))) {
 304                                 hv_undef(sym);
 305                                 hv_undef(elem);
 306                                 goto exit;
 307                         }
 308                 }
 309
 310                 if (node->map) {
 311                         struct map *map = node->map;
 312                         const char *dsoname = "[unknown]";
 313                         if (map && map->dso) {
 314                                 if (symbol_conf.show_kernel_path && map->dso->long_name)
 315                                         dsoname = map->dso->long_name;
 316                                 else
 317                                         dsoname = map->dso->name;
 318                         }
 319                         if (!hv_stores(elem, "dso", newSVpv(dsoname,0))) {
 320                                 hv_undef(elem);
 321                                 goto exit;
 322                         }
 323                 }
 324
 325                 callchain_cursor_advance(&callchain_cursor);
 326                 av_push(list, newRV_noinc((SV*)elem));
 327         }
 328
 329 exit:
 330         return newRV_noinc((SV*)list);
 331 }
 332
 333 static void perl_process_tracepoint(struct perf_sample *sample,
 334                                     struct perf_evsel *evsel,
 335                                     struct addr_location *al)
 336 {
 337         struct thread *thread = al->thread;
 338         struct event_format *event = evsel->tp_format;
 339         struct format_field *field;
 340         static char handler[256];
 341         unsigned long long val;
 342         unsigned long s, ns;
 343         int pid;
 344         int cpu = sample->cpu;
 345         void *data = sample->raw_data;
 346         unsigned long long nsecs = sample->time;
 347         const char *comm = thread__comm_str(thread);
 348
 349         dSP;
 350
 351         if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
 352                 return;
 353
 354         if (!event) {
 355                 pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->attr.config);
 356                 return;
 357         }
 358
 359         pid = raw_field_value(event, "common_pid", data);
 360
 361         sprintf(handler, "%s::%s", event->system, event->name);
 362
 363         if (!test_and_set_bit(event->id, events_defined))
 364                 define_event_symbols(event, handler, event->print_fmt.args);
 365
 366         s = nsecs / NSEC_PER_SEC;
 367         ns = nsecs - s * NSEC_PER_SEC;
 368
 369         scripting_context->event_data = data;
 370         scripting_context->pevent = evsel->tp_format->pevent;
 371
 372         ENTER;
 373         SAVETMPS;
 374         PUSHMARK(SP);
 375
 376         XPUSHs(sv_2mortal(newSVpv(handler, 0)));
 377         XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
 378         XPUSHs(sv_2mortal(newSVuv(cpu)));
 379         XPUSHs(sv_2mortal(newSVuv(s)));
 380         XPUSHs(sv_2mortal(newSVuv(ns)));
 381         XPUSHs(sv_2mortal(newSViv(pid)));
 382         XPUSHs(sv_2mortal(newSVpv(comm, 0)));
 383         XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
 384
 385         /* common fields other than pid can be accessed via xsub fns */
 386
 387         for (field = event->format.fields; field; field = field->next) {
 388                 if (field->flags & FIELD_IS_STRING) {
 389                         int offset;
 390                         if (field->flags & FIELD_IS_DYNAMIC) {
 391                                 offset = *(int *)(data + field->offset);
 392                                 offset &= 0xffff;
 393                         } else
 394                                 offset = field->offset;
 395                         XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
 396                 } else { /* FIELD_IS_NUMERIC */
 397                         val = read_size(event, data + field->offset,
 398                                         field->size);
 399                         if (field->flags & FIELD_IS_SIGNED) {
 400                                 XPUSHs(sv_2mortal(newSViv(val)));
 401                         } else {
 402                                 XPUSHs(sv_2mortal(newSVuv(val)));
 403                         }
 404                 }
 405         }
 406
 407         PUTBACK;
 408
 409         if (get_cv(handler, 0))
 410                 call_pv(handler, G_SCALAR);
 411         else if (get_cv("main::trace_unhandled", 0)) {
 412                 XPUSHs(sv_2mortal(newSVpv(handler, 0)));
 413                 XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
 414                 XPUSHs(sv_2mortal(newSVuv(cpu)));
 415                 XPUSHs(sv_2mortal(newSVuv(nsecs)));
 416                 XPUSHs(sv_2mortal(newSViv(pid)));
 417                 XPUSHs(sv_2mortal(newSVpv(comm, 0)));
 418                 XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
 419                 call_pv("main::trace_unhandled", G_SCALAR);
 420         }
 421         SPAGAIN;
 422         PUTBACK;
 423         FREETMPS;
 424         LEAVE;
 425 }
 426
 427 static void perl_process_event_generic(union perf_event *event,
 428                                        struct perf_sample *sample,
 429                                        struct perf_evsel *evsel)
 430 {
 431         dSP;
 432
 433         if (!get_cv("process_event", 0))
 434                 return;
 435
 436         ENTER;
 437         SAVETMPS;
 438         PUSHMARK(SP);
 439         XPUSHs(sv_2mortal(newSVpvn((const char *)event, event->header.size)));
 440         XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->attr, sizeof(evsel->attr))));
 441         XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
 442         XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
 443         PUTBACK;
 444         call_pv("process_event", G_SCALAR);
 445         SPAGAIN;
 446         PUTBACK;
 447         FREETMPS;
 448         LEAVE;
 449 }
 450
 451 static void perl_process_event(union perf_event *event,
 452                                struct perf_sample *sample,
 453                                struct perf_evsel *evsel,
 454                                struct addr_location *al)
 455 {
 456         perl_process_tracepoint(sample, evsel, al);
 457         perl_process_event_generic(event, sample, evsel);
 458 }
 459
 460 static void run_start_sub(void)
 461 {
 462         dSP; /* access to Perl stack */
 463         PUSHMARK(SP);
 464
 465         if (get_cv("main::trace_begin", 0))
 466                 call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
 467 }
 468
 469 /*
 470  * Start trace script
 471  */
 472 static int perl_start_script(const char *script, int argc, const char **argv)
 473 {
 474         const char **command_line;
 475         int i, err = 0;
 476
 477         command_line = malloc((argc + 2) * sizeof(const char *));
 478         command_line[0] = "";
 479         command_line[1] = script;
 480         for (i = 2; i < argc + 2; i++)
 481                 command_line[i] = argv[i - 2];
 482
 483         my_perl = perl_alloc();
 484         perl_construct(my_perl);
 485
 486         if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
 487                        (char **)NULL)) {
 488                 err = -1;
 489                 goto error;
 490         }
 491
 492         if (perl_run(my_perl)) {
 493                 err = -1;
 494                 goto error;
 495         }
 496
 497         if (SvTRUE(ERRSV)) {
 498                 err = -1;
 499                 goto error;
 500         }
 501
 502         run_start_sub();
 503
 504         free(command_line);
 505         return 0;
 506 error:
 507         perl_free(my_perl);
 508         free(command_line);
 509
 510         return err;
 511 }
 512
 513 static int perl_flush_script(void)
 514 {
 515         return 0;
 516 }
 517
 518 /*
 519  * Stop trace script
 520  */
 521 static int perl_stop_script(void)
 522 {
 523         dSP; /* access to Perl stack */
 524         PUSHMARK(SP);
 525
 526         if (get_cv("main::trace_end", 0))
 527                 call_pv("main::trace_end", G_DISCARD | G_NOARGS);
 528
 529         perl_destruct(my_perl);
 530         perl_free(my_perl);
 531
 532         return 0;
 533 }
 534
 535 static int perl_generate_script(struct pevent *pevent, const char *outfile)
 536 {
 537         struct event_format *event = NULL;
 538         struct format_field *f;
 539         char fname[PATH_MAX];
 540         int not_first, count;
 541         FILE *ofp;
 542
 543         sprintf(fname, "%s.pl", outfile);
 544         ofp = fopen(fname, "w");
 545         if (ofp == NULL) {
 546                 fprintf(stderr, "couldn't open %s\n", fname);
 547                 return -1;
 548         }
 549
 550         fprintf(ofp, "# perf script event handlers, "
 551                 "generated by perf script -g perl\n");
 552
 553         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 554                 " License version 2\n\n");
 555
 556         fprintf(ofp, "# The common_* event handler fields are the most useful "
 557                 "fields common to\n");
 558
 559         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 560                 "the 'common_*' fields\n");
 561
 562         fprintf(ofp, "# in the format files.  Those fields not available as "
 563                 "handler params can\n");
 564
 565         fprintf(ofp, "# be retrieved using Perl functions of the form "
 566                 "common_*($context).\n");
 567
 568         fprintf(ofp, "# See Context.pm for the list of available "
 569                 "functions.\n\n");
 570
 571         fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
 572                 "Perf-Trace-Util/lib\";\n");
 573
 574         fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
 575         fprintf(ofp, "use Perf::Trace::Core;\n");
 576         fprintf(ofp, "use Perf::Trace::Context;\n");
 577         fprintf(ofp, "use Perf::Trace::Util;\n\n");
 578
 579         fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
 580         fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n");
 581
 582
 583         fprintf(ofp, "\n\
 584 sub print_backtrace\n\
 585 {\n\
 586         my $callchain = shift;\n\
 587         for my $node (@$callchain)\n\
 588         {\n\
 589                 if(exists $node->{sym})\n\
 590                 {\n\
 591                         printf( \"\\t[\\%%x] \\%%s\\n\", $node->{ip}, $node->{sym}{name});\n\
 592                 }\n\
 593                 else\n\
 594                 {\n\
 595                         printf( \"\\t[\\%%x]\\n\", $node{ip});\n\
 596                 }\n\
 597         }\n\
 598 }\n\n\
 599 ");
 600
 601
 602         while ((event = trace_find_next_event(pevent, event))) {
 603                 fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
 604                 fprintf(ofp, "\tmy (");
 605
 606                 fprintf(ofp, "$event_name, ");
 607                 fprintf(ofp, "$context, ");
 608                 fprintf(ofp, "$common_cpu, ");
 609                 fprintf(ofp, "$common_secs, ");
 610                 fprintf(ofp, "$common_nsecs,\n");
 611                 fprintf(ofp, "\t    $common_pid, ");
 612                 fprintf(ofp, "$common_comm, ");
 613                 fprintf(ofp, "$common_callchain,\n\t    ");
 614
 615                 not_first = 0;
 616                 count = 0;
 617
 618                 for (f = event->format.fields; f; f = f->next) {
 619                         if (not_first++)
 620                                 fprintf(ofp, ", ");
 621                         if (++count % 5 == 0)
 622                                 fprintf(ofp, "\n\t    ");
 623
 624                         fprintf(ofp, "$%s", f->name);
 625                 }
 626                 fprintf(ofp, ") = @_;\n\n");
 627
 628                 fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
 629                         "$common_secs, $common_nsecs,\n\t             "
 630                         "$common_pid, $common_comm, $common_callchain);\n\n");
 631
 632                 fprintf(ofp, "\tprintf(\"");
 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 && count % 4 == 0) {
 641                                 fprintf(ofp, "\".\n\t       \"");
 642                         }
 643                         count++;
 644
 645                         fprintf(ofp, "%s=", f->name);
 646                         if (f->flags & FIELD_IS_STRING ||
 647                             f->flags & FIELD_IS_FLAG ||
 648                             f->flags & FIELD_IS_SYMBOLIC)
 649                                 fprintf(ofp, "%%s");
 650                         else if (f->flags & FIELD_IS_SIGNED)
 651                                 fprintf(ofp, "%%d");
 652                         else
 653                                 fprintf(ofp, "%%u");
 654                 }
 655
 656                 fprintf(ofp, "\\n\",\n\t       ");
 657
 658                 not_first = 0;
 659                 count = 0;
 660
 661                 for (f = event->format.fields; f; f = f->next) {
 662                         if (not_first++)
 663                                 fprintf(ofp, ", ");
 664
 665                         if (++count % 5 == 0)
 666                                 fprintf(ofp, "\n\t       ");
 667
 668                         if (f->flags & FIELD_IS_FLAG) {
 669                                 if ((count - 1) % 5 != 0) {
 670                                         fprintf(ofp, "\n\t       ");
 671                                         count = 4;
 672                                 }
 673                                 fprintf(ofp, "flag_str(\"");
 674                                 fprintf(ofp, "%s::%s\", ", event->system,
 675                                         event->name);
 676                                 fprintf(ofp, "\"%s\", $%s)", f->name,
 677                                         f->name);
 678                         } else if (f->flags & FIELD_IS_SYMBOLIC) {
 679                                 if ((count - 1) % 5 != 0) {
 680                                         fprintf(ofp, "\n\t       ");
 681                                         count = 4;
 682                                 }
 683                                 fprintf(ofp, "symbol_str(\"");
 684                                 fprintf(ofp, "%s::%s\", ", event->system,
 685                                         event->name);
 686                                 fprintf(ofp, "\"%s\", $%s)", f->name,
 687                                         f->name);
 688                         } else
 689                                 fprintf(ofp, "$%s", f->name);
 690                 }
 691
 692                 fprintf(ofp, ");\n\n");
 693
 694                 fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
 695
 696                 fprintf(ofp, "}\n\n");
 697         }
 698
 699         fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
 700                 "$common_cpu, $common_secs, $common_nsecs,\n\t    "
 701                 "$common_pid, $common_comm, $common_callchain) = @_;\n\n");
 702
 703         fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
 704                 "$common_secs, $common_nsecs,\n\t             $common_pid, "
 705                 "$common_comm, $common_callchain);\n");
 706         fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
 707         fprintf(ofp, "}\n\n");
 708
 709         fprintf(ofp, "sub print_header\n{\n"
 710                 "\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
 711                 "\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t       "
 712                 "$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
 713
 714         fprintf(ofp,
 715                 "\n# Packed byte string args of process_event():\n"
 716                 "#\n"
 717                 "# $event:\tunion perf_event\tutil/event.h\n"
 718                 "# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
 719                 "# $sample:\tstruct perf_sample\tutil/event.h\n"
 720                 "# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
 721                 "\n"
 722                 "sub process_event\n"
 723                 "{\n"
 724                 "\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
 725                 "\n"
 726                 "\tmy @event\t= unpack(\"LSS\", $event);\n"
 727                 "\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
 728                 "\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
 729                 "\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
 730                 "\n"
 731                 "\tuse Data::Dumper;\n"
 732                 "\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
 733                 "}\n");
 734
 735         fclose(ofp);
 736
 737         fprintf(stderr, "generated Perl script: %s\n", fname);
 738
 739         return 0;
 740 }
 741
 742 struct scripting_ops perl_scripting_ops = {
 743         .name = "Perl",
 744         .start_script = perl_start_script,
 745         .flush_script = perl_flush_script,
 746         .stop_script = perl_stop_script,
 747         .process_event = perl_process_event,
 748         .generate_script = perl_generate_script,
 749 };