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 <inttypes.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27 #include <errno.h>
  28 #include <linux/bitmap.h>
  29 #include <linux/time64.h>
  30 #include <traceevent/event-parse.h>
  31
  32 #include <stdbool.h>
  33 /* perl needs the following define, right after including stdbool.h */
  34 #define HAS_BOOL
  35 #include <EXTERN.h>
  36 #include <perl.h>
  37
  38 #include "../callchain.h"
  39 #include "../dso.h"
  40 #include "../machine.h"
  41 #include "../map.h"
  42 #include "../symbol.h"
  43 #include "../thread.h"
  44 #include "../event.h"
  45 #include "../trace-event.h"
  46 #include "../evsel.h"
  47 #include "../debug.h"
  48
  49 void boot_Perf__Trace__Context(pTHX_ CV *cv);
  50 void boot_DynaLoader(pTHX_ CV *cv);
  51 typedef PerlInterpreter * INTERP;
  52
  53 void xs_init(pTHX);
  54
  55 void xs_init(pTHX)
  56 {
  57         const char *file = __FILE__;
  58         dXSUB_SYS;
  59
  60         newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
  61               file);
  62         newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
  63 }
  64
  65 INTERP my_perl;
  66
  67 #define TRACE_EVENT_TYPE_MAX                            \
  68         ((1 << (sizeof(unsigned short) * 8)) - 1)
  69
  70 static DECLARE_BITMAP(events_defined, TRACE_EVENT_TYPE_MAX);
  71
  72 extern struct scripting_context *scripting_context;
  73
  74 static char *cur_field_name;
  75 static int zero_flag_atom;
  76
  77 static void define_symbolic_value(const char *ev_name,
  78                                   const char *field_name,
  79                                   const char *field_value,
  80                                   const char *field_str)
  81 {
  82         unsigned long long value;
  83         dSP;
  84
  85         value = eval_flag(field_value);
  86
  87         ENTER;
  88         SAVETMPS;
  89         PUSHMARK(SP);
  90
  91         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
  92         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
  93         XPUSHs(sv_2mortal(newSVuv(value)));
  94         XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
  95
  96         PUTBACK;
  97         if (get_cv("main::define_symbolic_value", 0))
  98                 call_pv("main::define_symbolic_value", G_SCALAR);
  99         SPAGAIN;
 100         PUTBACK;
 101         FREETMPS;
 102         LEAVE;
 103 }
 104
 105 static void define_symbolic_values(struct tep_print_flag_sym *field,
 106                                    const char *ev_name,
 107                                    const char *field_name)
 108 {
 109         define_symbolic_value(ev_name, field_name, field->value, field->str);
 110         if (field->next)
 111                 define_symbolic_values(field->next, ev_name, field_name);
 112 }
 113
 114 static void define_symbolic_field(const char *ev_name,
 115                                   const char *field_name)
 116 {
 117         dSP;
 118
 119         ENTER;
 120         SAVETMPS;
 121         PUSHMARK(SP);
 122
 123         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 124         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 125
 126         PUTBACK;
 127         if (get_cv("main::define_symbolic_field", 0))
 128                 call_pv("main::define_symbolic_field", G_SCALAR);
 129         SPAGAIN;
 130         PUTBACK;
 131         FREETMPS;
 132         LEAVE;
 133 }
 134
 135 static void define_flag_value(const char *ev_name,
 136                               const char *field_name,
 137                               const char *field_value,
 138                               const char *field_str)
 139 {
 140         unsigned long long value;
 141         dSP;
 142
 143         value = eval_flag(field_value);
 144
 145         ENTER;
 146         SAVETMPS;
 147         PUSHMARK(SP);
 148
 149         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 150         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 151         XPUSHs(sv_2mortal(newSVuv(value)));
 152         XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
 153
 154         PUTBACK;
 155         if (get_cv("main::define_flag_value", 0))
 156                 call_pv("main::define_flag_value", G_SCALAR);
 157         SPAGAIN;
 158         PUTBACK;
 159         FREETMPS;
 160         LEAVE;
 161 }
 162
 163 static void define_flag_values(struct tep_print_flag_sym *field,
 164                                const char *ev_name,
 165                                const char *field_name)
 166 {
 167         define_flag_value(ev_name, field_name, field->value, field->str);
 168         if (field->next)
 169                 define_flag_values(field->next, ev_name, field_name);
 170 }
 171
 172 static void define_flag_field(const char *ev_name,
 173                               const char *field_name,
 174                               const char *delim)
 175 {
 176         dSP;
 177
 178         ENTER;
 179         SAVETMPS;
 180         PUSHMARK(SP);
 181
 182         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 183         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 184         XPUSHs(sv_2mortal(newSVpv(delim, 0)));
 185
 186         PUTBACK;
 187         if (get_cv("main::define_flag_field", 0))
 188                 call_pv("main::define_flag_field", G_SCALAR);
 189         SPAGAIN;
 190         PUTBACK;
 191         FREETMPS;
 192         LEAVE;
 193 }
 194
 195 static void define_event_symbols(struct tep_event *event,
 196                                  const char *ev_name,
 197                                  struct tep_print_arg *args)
 198 {
 199         if (args == NULL)
 200                 return;
 201
 202         switch (args->type) {
 203         case TEP_PRINT_NULL:
 204                 break;
 205         case TEP_PRINT_ATOM:
 206                 define_flag_value(ev_name, cur_field_name, "0",
 207                                   args->atom.atom);
 208                 zero_flag_atom = 0;
 209                 break;
 210         case TEP_PRINT_FIELD:
 211                 free(cur_field_name);
 212                 cur_field_name = strdup(args->field.name);
 213                 break;
 214         case TEP_PRINT_FLAGS:
 215                 define_event_symbols(event, ev_name, args->flags.field);
 216                 define_flag_field(ev_name, cur_field_name, args->flags.delim);
 217                 define_flag_values(args->flags.flags, ev_name, cur_field_name);
 218                 break;
 219         case TEP_PRINT_SYMBOL:
 220                 define_event_symbols(event, ev_name, args->symbol.field);
 221                 define_symbolic_field(ev_name, cur_field_name);
 222                 define_symbolic_values(args->symbol.symbols, ev_name,
 223                                        cur_field_name);
 224                 break;
 225         case TEP_PRINT_HEX:
 226         case TEP_PRINT_HEX_STR:
 227                 define_event_symbols(event, ev_name, args->hex.field);
 228                 define_event_symbols(event, ev_name, args->hex.size);
 229                 break;
 230         case TEP_PRINT_INT_ARRAY:
 231                 define_event_symbols(event, ev_name, args->int_array.field);
 232                 define_event_symbols(event, ev_name, args->int_array.count);
 233                 define_event_symbols(event, ev_name, args->int_array.el_size);
 234                 break;
 235         case TEP_PRINT_BSTRING:
 236         case TEP_PRINT_DYNAMIC_ARRAY:
 237         case TEP_PRINT_DYNAMIC_ARRAY_LEN:
 238         case TEP_PRINT_STRING:
 239         case TEP_PRINT_BITMASK:
 240                 break;
 241         case TEP_PRINT_TYPE:
 242                 define_event_symbols(event, ev_name, args->typecast.item);
 243                 break;
 244         case TEP_PRINT_OP:
 245                 if (strcmp(args->op.op, ":") == 0)
 246                         zero_flag_atom = 1;
 247                 define_event_symbols(event, ev_name, args->op.left);
 248                 define_event_symbols(event, ev_name, args->op.right);
 249                 break;
 250         case TEP_PRINT_FUNC:
 251         default:
 252                 pr_err("Unsupported print arg type\n");
 253                 /* we should warn... */
 254                 return;
 255         }
 256
 257         if (args->next)
 258                 define_event_symbols(event, ev_name, args->next);
 259 }
 260
 261 static SV *perl_process_callchain(struct perf_sample *sample,
 262                                   struct evsel *evsel,
 263                                   struct addr_location *al)
 264 {
 265         AV *list;
 266
 267         list = newAV();
 268         if (!list)
 269                 goto exit;
 270
 271         if (!symbol_conf.use_callchain || !sample->callchain)
 272                 goto exit;
 273
 274         if (thread__resolve_callchain(al->thread, &callchain_cursor, evsel,
 275                                       sample, NULL, NULL, scripting_max_stack) != 0) {
 276                 pr_err("Failed to resolve callchain. Skipping\n");
 277                 goto exit;
 278         }
 279         callchain_cursor_commit(&callchain_cursor);
 280
 281
 282         while (1) {
 283                 HV *elem;
 284                 struct callchain_cursor_node *node;
 285                 node = callchain_cursor_current(&callchain_cursor);
 286                 if (!node)
 287                         break;
 288
 289                 elem = newHV();
 290                 if (!elem)
 291                         goto exit;
 292
 293                 if (!hv_stores(elem, "ip", newSVuv(node->ip))) {
 294                         hv_undef(elem);
 295                         goto exit;
 296                 }
 297
 298                 if (node->ms.sym) {
 299                         HV *sym = newHV();
 300                         if (!sym) {
 301                                 hv_undef(elem);
 302                                 goto exit;
 303                         }
 304                         if (!hv_stores(sym, "start",   newSVuv(node->ms.sym->start)) ||
 305                             !hv_stores(sym, "end",     newSVuv(node->ms.sym->end)) ||
 306                             !hv_stores(sym, "binding", newSVuv(node->ms.sym->binding)) ||
 307                             !hv_stores(sym, "name",    newSVpvn(node->ms.sym->name,
 308                                                                 node->ms.sym->namelen)) ||
 309                             !hv_stores(elem, "sym",    newRV_noinc((SV*)sym))) {
 310                                 hv_undef(sym);
 311                                 hv_undef(elem);
 312                                 goto exit;
 313                         }
 314                 }
 315
 316                 if (node->ms.map) {
 317                         struct map *map = node->ms.map;
 318                         const char *dsoname = "[unknown]";
 319                         if (map && map->dso) {
 320                                 if (symbol_conf.show_kernel_path && map->dso->long_name)
 321                                         dsoname = map->dso->long_name;
 322                                 else
 323                                         dsoname = map->dso->name;
 324                         }
 325                         if (!hv_stores(elem, "dso", newSVpv(dsoname,0))) {
 326                                 hv_undef(elem);
 327                                 goto exit;
 328                         }
 329                 }
 330
 331                 callchain_cursor_advance(&callchain_cursor);
 332                 av_push(list, newRV_noinc((SV*)elem));
 333         }
 334
 335 exit:
 336         return newRV_noinc((SV*)list);
 337 }
 338
 339 static void perl_process_tracepoint(struct perf_sample *sample,
 340                                     struct evsel *evsel,
 341                                     struct addr_location *al)
 342 {
 343         struct thread *thread = al->thread;
 344         struct tep_event *event = evsel->tp_format;
 345         struct tep_format_field *field;
 346         static char handler[256];
 347         unsigned long long val;
 348         unsigned long s, ns;
 349         int pid;
 350         int cpu = sample->cpu;
 351         void *data = sample->raw_data;
 352         unsigned long long nsecs = sample->time;
 353         const char *comm = thread__comm_str(thread);
 354
 355         dSP;
 356
 357         if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
 358                 return;
 359
 360         if (!event) {
 361                 pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->core.attr.config);
 362                 return;
 363         }
 364
 365         pid = raw_field_value(event, "common_pid", data);
 366
 367         sprintf(handler, "%s::%s", event->system, event->name);
 368
 369         if (!__test_and_set_bit(event->id, events_defined))
 370                 define_event_symbols(event, handler, event->print_fmt.args);
 371
 372         s = nsecs / NSEC_PER_SEC;
 373         ns = nsecs - s * NSEC_PER_SEC;
 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 & TEP_FIELD_IS_STRING) {
 392                         int offset;
 393                         if (field->flags & TEP_FIELD_IS_DYNAMIC) {
 394                                 offset = *(int *)(data + field->offset);
 395                                 offset &= 0xffff;
 396 #ifdef HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
 397                                 if (field->flags & TEP_FIELD_IS_RELATIVE)
 398                                         offset += field->offset + field->size;
 399 #endif
 400                         } else
 401                                 offset = field->offset;
 402                         XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
 403                 } else { /* FIELD_IS_NUMERIC */
 404                         val = read_size(event, data + field->offset,
 405                                         field->size);
 406                         if (field->flags & TEP_FIELD_IS_SIGNED) {
 407                                 XPUSHs(sv_2mortal(newSViv(val)));
 408                         } else {
 409                                 XPUSHs(sv_2mortal(newSVuv(val)));
 410                         }
 411                 }
 412         }
 413
 414         PUTBACK;
 415
 416         if (get_cv(handler, 0))
 417                 call_pv(handler, G_SCALAR);
 418         else if (get_cv("main::trace_unhandled", 0)) {
 419                 XPUSHs(sv_2mortal(newSVpv(handler, 0)));
 420                 XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
 421                 XPUSHs(sv_2mortal(newSVuv(cpu)));
 422                 XPUSHs(sv_2mortal(newSVuv(nsecs)));
 423                 XPUSHs(sv_2mortal(newSViv(pid)));
 424                 XPUSHs(sv_2mortal(newSVpv(comm, 0)));
 425                 XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
 426                 call_pv("main::trace_unhandled", G_SCALAR);
 427         }
 428         SPAGAIN;
 429         PUTBACK;
 430         FREETMPS;
 431         LEAVE;
 432 }
 433
 434 static void perl_process_event_generic(union perf_event *event,
 435                                        struct perf_sample *sample,
 436                                        struct evsel *evsel)
 437 {
 438         dSP;
 439
 440         if (!get_cv("process_event", 0))
 441                 return;
 442
 443         ENTER;
 444         SAVETMPS;
 445         PUSHMARK(SP);
 446         XPUSHs(sv_2mortal(newSVpvn((const char *)event, event->header.size)));
 447         XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->core.attr, sizeof(evsel->core.attr))));
 448         XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
 449         XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
 450         PUTBACK;
 451         call_pv("process_event", G_SCALAR);
 452         SPAGAIN;
 453         PUTBACK;
 454         FREETMPS;
 455         LEAVE;
 456 }
 457
 458 static void perl_process_event(union perf_event *event,
 459                                struct perf_sample *sample,
 460                                struct evsel *evsel,
 461                                struct addr_location *al,
 462                                struct addr_location *addr_al)
 463 {
 464         scripting_context__update(scripting_context, event, sample, evsel, al, addr_al);
 465         perl_process_tracepoint(sample, evsel, al);
 466         perl_process_event_generic(event, sample, evsel);
 467 }
 468
 469 static void run_start_sub(void)
 470 {
 471         dSP; /* access to Perl stack */
 472         PUSHMARK(SP);
 473
 474         if (get_cv("main::trace_begin", 0))
 475                 call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
 476 }
 477
 478 /*
 479  * Start trace script
 480  */
 481 static int perl_start_script(const char *script, int argc, const char **argv,
 482                              struct perf_session *session)
 483 {
 484         const char **command_line;
 485         int i, err = 0;
 486
 487         scripting_context->session = session;
 488
 489         command_line = malloc((argc + 2) * sizeof(const char *));
 490         command_line[0] = "";
 491         command_line[1] = script;
 492         for (i = 2; i < argc + 2; i++)
 493                 command_line[i] = argv[i - 2];
 494
 495         my_perl = perl_alloc();
 496         perl_construct(my_perl);
 497
 498         if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
 499                        (char **)NULL)) {
 500                 err = -1;
 501                 goto error;
 502         }
 503
 504         if (perl_run(my_perl)) {
 505                 err = -1;
 506                 goto error;
 507         }
 508
 509         if (SvTRUE(ERRSV)) {
 510                 err = -1;
 511                 goto error;
 512         }
 513
 514         run_start_sub();
 515
 516         free(command_line);
 517         return 0;
 518 error:
 519         perl_free(my_perl);
 520         free(command_line);
 521
 522         return err;
 523 }
 524
 525 static int perl_flush_script(void)
 526 {
 527         return 0;
 528 }
 529
 530 /*
 531  * Stop trace script
 532  */
 533 static int perl_stop_script(void)
 534 {
 535         dSP; /* access to Perl stack */
 536         PUSHMARK(SP);
 537
 538         if (get_cv("main::trace_end", 0))
 539                 call_pv("main::trace_end", G_DISCARD | G_NOARGS);
 540
 541         perl_destruct(my_perl);
 542         perl_free(my_perl);
 543
 544         return 0;
 545 }
 546
 547 static int perl_generate_script(struct tep_handle *pevent, const char *outfile)
 548 {
 549         int i, not_first, count, nr_events;
 550         struct tep_event **all_events;
 551         struct tep_event *event = NULL;
 552         struct tep_format_field *f;
 553         char fname[PATH_MAX];
 554         FILE *ofp;
 555
 556         sprintf(fname, "%s.pl", outfile);
 557         ofp = fopen(fname, "w");
 558         if (ofp == NULL) {
 559                 fprintf(stderr, "couldn't open %s\n", fname);
 560                 return -1;
 561         }
 562
 563         fprintf(ofp, "# perf script event handlers, "
 564                 "generated by perf script -g perl\n");
 565
 566         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 567                 " License version 2\n\n");
 568
 569         fprintf(ofp, "# The common_* event handler fields are the most useful "
 570                 "fields common to\n");
 571
 572         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 573                 "the 'common_*' fields\n");
 574
 575         fprintf(ofp, "# in the format files.  Those fields not available as "
 576                 "handler params can\n");
 577
 578         fprintf(ofp, "# be retrieved using Perl functions of the form "
 579                 "common_*($context).\n");
 580
 581         fprintf(ofp, "# See Context.pm for the list of available "
 582                 "functions.\n\n");
 583
 584         fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
 585                 "Perf-Trace-Util/lib\";\n");
 586
 587         fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
 588         fprintf(ofp, "use Perf::Trace::Core;\n");
 589         fprintf(ofp, "use Perf::Trace::Context;\n");
 590         fprintf(ofp, "use Perf::Trace::Util;\n\n");
 591
 592         fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
 593         fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n");
 594
 595
 596         fprintf(ofp, "\n\
 597 sub print_backtrace\n\
 598 {\n\
 599         my $callchain = shift;\n\
 600         for my $node (@$callchain)\n\
 601         {\n\
 602                 if(exists $node->{sym})\n\
 603                 {\n\
 604                         printf( \"\\t[\\%%x] \\%%s\\n\", $node->{ip}, $node->{sym}{name});\n\
 605                 }\n\
 606                 else\n\
 607                 {\n\
 608                         printf( \"\\t[\\%%x]\\n\", $node{ip});\n\
 609                 }\n\
 610         }\n\
 611 }\n\n\
 612 ");
 613
 614         nr_events = tep_get_events_count(pevent);
 615         all_events = tep_list_events(pevent, TEP_EVENT_SORT_ID);
 616
 617         for (i = 0; all_events && i < nr_events; i++) {
 618                 event = all_events[i];
 619                 fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
 620                 fprintf(ofp, "\tmy (");
 621
 622                 fprintf(ofp, "$event_name, ");
 623                 fprintf(ofp, "$context, ");
 624                 fprintf(ofp, "$common_cpu, ");
 625                 fprintf(ofp, "$common_secs, ");
 626                 fprintf(ofp, "$common_nsecs,\n");
 627                 fprintf(ofp, "\t    $common_pid, ");
 628                 fprintf(ofp, "$common_comm, ");
 629                 fprintf(ofp, "$common_callchain,\n\t    ");
 630
 631                 not_first = 0;
 632                 count = 0;
 633
 634                 for (f = event->format.fields; f; f = f->next) {
 635                         if (not_first++)
 636                                 fprintf(ofp, ", ");
 637                         if (++count % 5 == 0)
 638                                 fprintf(ofp, "\n\t    ");
 639
 640                         fprintf(ofp, "$%s", f->name);
 641                 }
 642                 fprintf(ofp, ") = @_;\n\n");
 643
 644                 fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
 645                         "$common_secs, $common_nsecs,\n\t             "
 646                         "$common_pid, $common_comm, $common_callchain);\n\n");
 647
 648                 fprintf(ofp, "\tprintf(\"");
 649
 650                 not_first = 0;
 651                 count = 0;
 652
 653                 for (f = event->format.fields; f; f = f->next) {
 654                         if (not_first++)
 655                                 fprintf(ofp, ", ");
 656                         if (count && count % 4 == 0) {
 657                                 fprintf(ofp, "\".\n\t       \"");
 658                         }
 659                         count++;
 660
 661                         fprintf(ofp, "%s=", f->name);
 662                         if (f->flags & TEP_FIELD_IS_STRING ||
 663                             f->flags & TEP_FIELD_IS_FLAG ||
 664                             f->flags & TEP_FIELD_IS_SYMBOLIC)
 665                                 fprintf(ofp, "%%s");
 666                         else if (f->flags & TEP_FIELD_IS_SIGNED)
 667                                 fprintf(ofp, "%%d");
 668                         else
 669                                 fprintf(ofp, "%%u");
 670                 }
 671
 672                 fprintf(ofp, "\\n\",\n\t       ");
 673
 674                 not_first = 0;
 675                 count = 0;
 676
 677                 for (f = event->format.fields; f; f = f->next) {
 678                         if (not_first++)
 679                                 fprintf(ofp, ", ");
 680
 681                         if (++count % 5 == 0)
 682                                 fprintf(ofp, "\n\t       ");
 683
 684                         if (f->flags & TEP_FIELD_IS_FLAG) {
 685                                 if ((count - 1) % 5 != 0) {
 686                                         fprintf(ofp, "\n\t       ");
 687                                         count = 4;
 688                                 }
 689                                 fprintf(ofp, "flag_str(\"");
 690                                 fprintf(ofp, "%s::%s\", ", event->system,
 691                                         event->name);
 692                                 fprintf(ofp, "\"%s\", $%s)", f->name,
 693                                         f->name);
 694                         } else if (f->flags & TEP_FIELD_IS_SYMBOLIC) {
 695                                 if ((count - 1) % 5 != 0) {
 696                                         fprintf(ofp, "\n\t       ");
 697                                         count = 4;
 698                                 }
 699                                 fprintf(ofp, "symbol_str(\"");
 700                                 fprintf(ofp, "%s::%s\", ", event->system,
 701                                         event->name);
 702                                 fprintf(ofp, "\"%s\", $%s)", f->name,
 703                                         f->name);
 704                         } else
 705                                 fprintf(ofp, "$%s", f->name);
 706                 }
 707
 708                 fprintf(ofp, ");\n\n");
 709
 710                 fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
 711
 712                 fprintf(ofp, "}\n\n");
 713         }
 714
 715         fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
 716                 "$common_cpu, $common_secs, $common_nsecs,\n\t    "
 717                 "$common_pid, $common_comm, $common_callchain) = @_;\n\n");
 718
 719         fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
 720                 "$common_secs, $common_nsecs,\n\t             $common_pid, "
 721                 "$common_comm, $common_callchain);\n");
 722         fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
 723         fprintf(ofp, "}\n\n");
 724
 725         fprintf(ofp, "sub print_header\n{\n"
 726                 "\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
 727                 "\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t       "
 728                 "$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
 729
 730         fprintf(ofp,
 731                 "\n# Packed byte string args of process_event():\n"
 732                 "#\n"
 733                 "# $event:\tunion perf_event\tutil/event.h\n"
 734                 "# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
 735                 "# $sample:\tstruct perf_sample\tutil/event.h\n"
 736                 "# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
 737                 "\n"
 738                 "sub process_event\n"
 739                 "{\n"
 740                 "\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
 741                 "\n"
 742                 "\tmy @event\t= unpack(\"LSS\", $event);\n"
 743                 "\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
 744                 "\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
 745                 "\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
 746                 "\n"
 747                 "\tuse Data::Dumper;\n"
 748                 "\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
 749                 "}\n");
 750
 751         fclose(ofp);
 752
 753         fprintf(stderr, "generated Perl script: %s\n", fname);
 754
 755         return 0;
 756 }
 757
 758 struct scripting_ops perl_scripting_ops = {
 759         .name = "Perl",
 760         .dirname = "perl",
 761         .start_script = perl_start_script,
 762         .flush_script = perl_flush_script,
 763         .stop_script = perl_stop_script,
 764         .process_event = perl_process_event,
 765         .generate_script = perl_generate_script,
 766 };