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