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 <inttypes.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27 #include <errno.h>
  28 #include <linux/bitmap.h>
  29 #include <linux/time64.h>
  30
  31 #include <stdbool.h>
  32 /* perl needs the following define, right after including stdbool.h */
  33 #define HAS_BOOL
  34 #include <EXTERN.h>
  35 #include <perl.h>
  36
  37 #include "../../perf.h"
  38 #include "../callchain.h"
  39 #include "../machine.h"
  40 #include "../map.h"
  41 #include "../symbol.h"
  42 #include "../thread.h"
  43 #include "../event.h"
  44 #include "../trace-event.h"
  45 #include "../evsel.h"
  46 #include "../debug.h"
  47
  48 void boot_Perf__Trace__Context(pTHX_ CV *cv);
  49 void boot_DynaLoader(pTHX_ CV *cv);
  50 typedef PerlInterpreter * INTERP;
  51
  52 void xs_init(pTHX);
  53
  54 void xs_init(pTHX)
  55 {
  56         const char *file = __FILE__;
  57         dXSUB_SYS;
  58
  59         newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
  60               file);
  61         newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
  62 }
  63
  64 INTERP my_perl;
  65
  66 #define TRACE_EVENT_TYPE_MAX                            \
  67         ((1 << (sizeof(unsigned short) * 8)) - 1)
  68
  69 static DECLARE_BITMAP(events_defined, TRACE_EVENT_TYPE_MAX);
  70
  71 extern struct scripting_context *scripting_context;
  72
  73 static char *cur_field_name;
  74 static int zero_flag_atom;
  75
  76 static void define_symbolic_value(const char *ev_name,
  77                                   const char *field_name,
  78                                   const char *field_value,
  79                                   const char *field_str)
  80 {
  81         unsigned long long value;
  82         dSP;
  83
  84         value = eval_flag(field_value);
  85
  86         ENTER;
  87         SAVETMPS;
  88         PUSHMARK(SP);
  89
  90         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
  91         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
  92         XPUSHs(sv_2mortal(newSVuv(value)));
  93         XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
  94
  95         PUTBACK;
  96         if (get_cv("main::define_symbolic_value", 0))
  97                 call_pv("main::define_symbolic_value", G_SCALAR);
  98         SPAGAIN;
  99         PUTBACK;
 100         FREETMPS;
 101         LEAVE;
 102 }
 103
 104 static void define_symbolic_values(struct tep_print_flag_sym *field,
 105                                    const char *ev_name,
 106                                    const char *field_name)
 107 {
 108         define_symbolic_value(ev_name, field_name, field->value, field->str);
 109         if (field->next)
 110                 define_symbolic_values(field->next, ev_name, field_name);
 111 }
 112
 113 static void define_symbolic_field(const char *ev_name,
 114                                   const char *field_name)
 115 {
 116         dSP;
 117
 118         ENTER;
 119         SAVETMPS;
 120         PUSHMARK(SP);
 121
 122         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 123         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 124
 125         PUTBACK;
 126         if (get_cv("main::define_symbolic_field", 0))
 127                 call_pv("main::define_symbolic_field", G_SCALAR);
 128         SPAGAIN;
 129         PUTBACK;
 130         FREETMPS;
 131         LEAVE;
 132 }
 133
 134 static void define_flag_value(const char *ev_name,
 135                               const char *field_name,
 136                               const char *field_value,
 137                               const char *field_str)
 138 {
 139         unsigned long long value;
 140         dSP;
 141
 142         value = eval_flag(field_value);
 143
 144         ENTER;
 145         SAVETMPS;
 146         PUSHMARK(SP);
 147
 148         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 149         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 150         XPUSHs(sv_2mortal(newSVuv(value)));
 151         XPUSHs(sv_2mortal(newSVpv(field_str, 0)));
 152
 153         PUTBACK;
 154         if (get_cv("main::define_flag_value", 0))
 155                 call_pv("main::define_flag_value", G_SCALAR);
 156         SPAGAIN;
 157         PUTBACK;
 158         FREETMPS;
 159         LEAVE;
 160 }
 161
 162 static void define_flag_values(struct tep_print_flag_sym *field,
 163                                const char *ev_name,
 164                                const char *field_name)
 165 {
 166         define_flag_value(ev_name, field_name, field->value, field->str);
 167         if (field->next)
 168                 define_flag_values(field->next, ev_name, field_name);
 169 }
 170
 171 static void define_flag_field(const char *ev_name,
 172                               const char *field_name,
 173                               const char *delim)
 174 {
 175         dSP;
 176
 177         ENTER;
 178         SAVETMPS;
 179         PUSHMARK(SP);
 180
 181         XPUSHs(sv_2mortal(newSVpv(ev_name, 0)));
 182         XPUSHs(sv_2mortal(newSVpv(field_name, 0)));
 183         XPUSHs(sv_2mortal(newSVpv(delim, 0)));
 184
 185         PUTBACK;
 186         if (get_cv("main::define_flag_field", 0))
 187                 call_pv("main::define_flag_field", G_SCALAR);
 188         SPAGAIN;
 189         PUTBACK;
 190         FREETMPS;
 191         LEAVE;
 192 }
 193
 194 static void define_event_symbols(struct tep_event *event,
 195                                  const char *ev_name,
 196                                  struct tep_print_arg *args)
 197 {
 198         if (args == NULL)
 199                 return;
 200
 201         switch (args->type) {
 202         case TEP_PRINT_NULL:
 203                 break;
 204         case TEP_PRINT_ATOM:
 205                 define_flag_value(ev_name, cur_field_name, "0",
 206                                   args->atom.atom);
 207                 zero_flag_atom = 0;
 208                 break;
 209         case TEP_PRINT_FIELD:
 210                 free(cur_field_name);
 211                 cur_field_name = strdup(args->field.name);
 212                 break;
 213         case TEP_PRINT_FLAGS:
 214                 define_event_symbols(event, ev_name, args->flags.field);
 215                 define_flag_field(ev_name, cur_field_name, args->flags.delim);
 216                 define_flag_values(args->flags.flags, ev_name, cur_field_name);
 217                 break;
 218         case TEP_PRINT_SYMBOL:
 219                 define_event_symbols(event, ev_name, args->symbol.field);
 220                 define_symbolic_field(ev_name, cur_field_name);
 221                 define_symbolic_values(args->symbol.symbols, ev_name,
 222                                        cur_field_name);
 223                 break;
 224         case TEP_PRINT_HEX:
 225         case TEP_PRINT_HEX_STR:
 226                 define_event_symbols(event, ev_name, args->hex.field);
 227                 define_event_symbols(event, ev_name, args->hex.size);
 228                 break;
 229         case TEP_PRINT_INT_ARRAY:
 230                 define_event_symbols(event, ev_name, args->int_array.field);
 231                 define_event_symbols(event, ev_name, args->int_array.count);
 232                 define_event_symbols(event, ev_name, args->int_array.el_size);
 233                 break;
 234         case TEP_PRINT_BSTRING:
 235         case TEP_PRINT_DYNAMIC_ARRAY:
 236         case TEP_PRINT_DYNAMIC_ARRAY_LEN:
 237         case TEP_PRINT_STRING:
 238         case TEP_PRINT_BITMASK:
 239                 break;
 240         case TEP_PRINT_TYPE:
 241                 define_event_symbols(event, ev_name, args->typecast.item);
 242                 break;
 243         case TEP_PRINT_OP:
 244                 if (strcmp(args->op.op, ":") == 0)
 245                         zero_flag_atom = 1;
 246                 define_event_symbols(event, ev_name, args->op.left);
 247                 define_event_symbols(event, ev_name, args->op.right);
 248                 break;
 249         case TEP_PRINT_FUNC:
 250         default:
 251                 pr_err("Unsupported print arg type\n");
 252                 /* we should warn... */
 253                 return;
 254         }
 255
 256         if (args->next)
 257                 define_event_symbols(event, ev_name, args->next);
 258 }
 259
 260 static SV *perl_process_callchain(struct perf_sample *sample,
 261                                   struct evsel *evsel,
 262                                   struct addr_location *al)
 263 {
 264         AV *list;
 265
 266         list = newAV();
 267         if (!list)
 268                 goto exit;
 269
 270         if (!symbol_conf.use_callchain || !sample->callchain)
 271                 goto exit;
 272
 273         if (thread__resolve_callchain(al->thread, &callchain_cursor, evsel,
 274                                       sample, NULL, NULL, scripting_max_stack) != 0) {
 275                 pr_err("Failed to resolve callchain. Skipping\n");
 276                 goto exit;
 277         }
 278         callchain_cursor_commit(&callchain_cursor);
 279
 280
 281         while (1) {
 282                 HV *elem;
 283                 struct callchain_cursor_node *node;
 284                 node = callchain_cursor_current(&callchain_cursor);
 285                 if (!node)
 286                         break;
 287
 288                 elem = newHV();
 289                 if (!elem)
 290                         goto exit;
 291
 292                 if (!hv_stores(elem, "ip", newSVuv(node->ip))) {
 293                         hv_undef(elem);
 294                         goto exit;
 295                 }
 296
 297                 if (node->sym) {
 298                         HV *sym = newHV();
 299                         if (!sym) {
 300                                 hv_undef(elem);
 301                                 goto exit;
 302                         }
 303                         if (!hv_stores(sym, "start",   newSVuv(node->sym->start)) ||
 304                             !hv_stores(sym, "end",     newSVuv(node->sym->end)) ||
 305                             !hv_stores(sym, "binding", newSVuv(node->sym->binding)) ||
 306                             !hv_stores(sym, "name",    newSVpvn(node->sym->name,
 307                                                                 node->sym->namelen)) ||
 308                             !hv_stores(elem, "sym",    newRV_noinc((SV*)sym))) {
 309                                 hv_undef(sym);
 310                                 hv_undef(elem);
 311                                 goto exit;
 312                         }
 313                 }
 314
 315                 if (node->map) {
 316                         struct map *map = node->map;
 317                         const char *dsoname = "[unknown]";
 318                         if (map && map->dso) {
 319                                 if (symbol_conf.show_kernel_path && map->dso->long_name)
 320                                         dsoname = map->dso->long_name;
 321                                 else
 322                                         dsoname = map->dso->name;
 323                         }
 324                         if (!hv_stores(elem, "dso", newSVpv(dsoname,0))) {
 325                                 hv_undef(elem);
 326                                 goto exit;
 327                         }
 328                 }
 329
 330                 callchain_cursor_advance(&callchain_cursor);
 331                 av_push(list, newRV_noinc((SV*)elem));
 332         }
 333
 334 exit:
 335         return newRV_noinc((SV*)list);
 336 }
 337
 338 static void perl_process_tracepoint(struct perf_sample *sample,
 339                                     struct evsel *evsel,
 340                                     struct addr_location *al)
 341 {
 342         struct thread *thread = al->thread;
 343         struct tep_event *event = evsel->tp_format;
 344         struct tep_format_field *field;
 345         static char handler[256];
 346         unsigned long long val;
 347         unsigned long s, ns;
 348         int pid;
 349         int cpu = sample->cpu;
 350         void *data = sample->raw_data;
 351         unsigned long long nsecs = sample->time;
 352         const char *comm = thread__comm_str(thread);
 353
 354         dSP;
 355
 356         if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
 357                 return;
 358
 359         if (!event) {
 360                 pr_debug("ug! no event found for type %" PRIu64, (u64)evsel->attr.config);
 361                 return;
 362         }
 363
 364         pid = raw_field_value(event, "common_pid", data);
 365
 366         sprintf(handler, "%s::%s", event->system, event->name);
 367
 368         if (!test_and_set_bit(event->id, events_defined))
 369                 define_event_symbols(event, handler, event->print_fmt.args);
 370
 371         s = nsecs / NSEC_PER_SEC;
 372         ns = nsecs - s * NSEC_PER_SEC;
 373
 374         scripting_context->event_data = data;
 375         scripting_context->pevent = evsel->tp_format->tep;
 376
 377         ENTER;
 378         SAVETMPS;
 379         PUSHMARK(SP);
 380
 381         XPUSHs(sv_2mortal(newSVpv(handler, 0)));
 382         XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
 383         XPUSHs(sv_2mortal(newSVuv(cpu)));
 384         XPUSHs(sv_2mortal(newSVuv(s)));
 385         XPUSHs(sv_2mortal(newSVuv(ns)));
 386         XPUSHs(sv_2mortal(newSViv(pid)));
 387         XPUSHs(sv_2mortal(newSVpv(comm, 0)));
 388         XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
 389
 390         /* common fields other than pid can be accessed via xsub fns */
 391
 392         for (field = event->format.fields; field; field = field->next) {
 393                 if (field->flags & TEP_FIELD_IS_STRING) {
 394                         int offset;
 395                         if (field->flags & TEP_FIELD_IS_DYNAMIC) {
 396                                 offset = *(int *)(data + field->offset);
 397                                 offset &= 0xffff;
 398                         } else
 399                                 offset = field->offset;
 400                         XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
 401                 } else { /* FIELD_IS_NUMERIC */
 402                         val = read_size(event, data + field->offset,
 403                                         field->size);
 404                         if (field->flags & TEP_FIELD_IS_SIGNED) {
 405                                 XPUSHs(sv_2mortal(newSViv(val)));
 406                         } else {
 407                                 XPUSHs(sv_2mortal(newSVuv(val)));
 408                         }
 409                 }
 410         }
 411
 412         PUTBACK;
 413
 414         if (get_cv(handler, 0))
 415                 call_pv(handler, G_SCALAR);
 416         else if (get_cv("main::trace_unhandled", 0)) {
 417                 XPUSHs(sv_2mortal(newSVpv(handler, 0)));
 418                 XPUSHs(sv_2mortal(newSViv(PTR2IV(scripting_context))));
 419                 XPUSHs(sv_2mortal(newSVuv(cpu)));
 420                 XPUSHs(sv_2mortal(newSVuv(nsecs)));
 421                 XPUSHs(sv_2mortal(newSViv(pid)));
 422                 XPUSHs(sv_2mortal(newSVpv(comm, 0)));
 423                 XPUSHs(sv_2mortal(perl_process_callchain(sample, evsel, al)));
 424                 call_pv("main::trace_unhandled", G_SCALAR);
 425         }
 426         SPAGAIN;
 427         PUTBACK;
 428         FREETMPS;
 429         LEAVE;
 430 }
 431
 432 static void perl_process_event_generic(union perf_event *event,
 433                                        struct perf_sample *sample,
 434                                        struct evsel *evsel)
 435 {
 436         dSP;
 437
 438         if (!get_cv("process_event", 0))
 439                 return;
 440
 441         ENTER;
 442         SAVETMPS;
 443         PUSHMARK(SP);
 444         XPUSHs(sv_2mortal(newSVpvn((const char *)event, event->header.size)));
 445         XPUSHs(sv_2mortal(newSVpvn((const char *)&evsel->attr, sizeof(evsel->attr))));
 446         XPUSHs(sv_2mortal(newSVpvn((const char *)sample, sizeof(*sample))));
 447         XPUSHs(sv_2mortal(newSVpvn((const char *)sample->raw_data, sample->raw_size)));
 448         PUTBACK;
 449         call_pv("process_event", G_SCALAR);
 450         SPAGAIN;
 451         PUTBACK;
 452         FREETMPS;
 453         LEAVE;
 454 }
 455
 456 static void perl_process_event(union perf_event *event,
 457                                struct perf_sample *sample,
 458                                struct evsel *evsel,
 459                                struct addr_location *al)
 460 {
 461         perl_process_tracepoint(sample, evsel, al);
 462         perl_process_event_generic(event, sample, evsel);
 463 }
 464
 465 static void run_start_sub(void)
 466 {
 467         dSP; /* access to Perl stack */
 468         PUSHMARK(SP);
 469
 470         if (get_cv("main::trace_begin", 0))
 471                 call_pv("main::trace_begin", G_DISCARD | G_NOARGS);
 472 }
 473
 474 /*
 475  * Start trace script
 476  */
 477 static int perl_start_script(const char *script, int argc, const char **argv)
 478 {
 479         const char **command_line;
 480         int i, err = 0;
 481
 482         command_line = malloc((argc + 2) * sizeof(const char *));
 483         command_line[0] = "";
 484         command_line[1] = script;
 485         for (i = 2; i < argc + 2; i++)
 486                 command_line[i] = argv[i - 2];
 487
 488         my_perl = perl_alloc();
 489         perl_construct(my_perl);
 490
 491         if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
 492                        (char **)NULL)) {
 493                 err = -1;
 494                 goto error;
 495         }
 496
 497         if (perl_run(my_perl)) {
 498                 err = -1;
 499                 goto error;
 500         }
 501
 502         if (SvTRUE(ERRSV)) {
 503                 err = -1;
 504                 goto error;
 505         }
 506
 507         run_start_sub();
 508
 509         free(command_line);
 510         return 0;
 511 error:
 512         perl_free(my_perl);
 513         free(command_line);
 514
 515         return err;
 516 }
 517
 518 static int perl_flush_script(void)
 519 {
 520         return 0;
 521 }
 522
 523 /*
 524  * Stop trace script
 525  */
 526 static int perl_stop_script(void)
 527 {
 528         dSP; /* access to Perl stack */
 529         PUSHMARK(SP);
 530
 531         if (get_cv("main::trace_end", 0))
 532                 call_pv("main::trace_end", G_DISCARD | G_NOARGS);
 533
 534         perl_destruct(my_perl);
 535         perl_free(my_perl);
 536
 537         return 0;
 538 }
 539
 540 static int perl_generate_script(struct tep_handle *pevent, const char *outfile)
 541 {
 542         struct tep_event *event = NULL;
 543         struct tep_format_field *f;
 544         char fname[PATH_MAX];
 545         int not_first, count;
 546         FILE *ofp;
 547
 548         sprintf(fname, "%s.pl", outfile);
 549         ofp = fopen(fname, "w");
 550         if (ofp == NULL) {
 551                 fprintf(stderr, "couldn't open %s\n", fname);
 552                 return -1;
 553         }
 554
 555         fprintf(ofp, "# perf script event handlers, "
 556                 "generated by perf script -g perl\n");
 557
 558         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 559                 " License version 2\n\n");
 560
 561         fprintf(ofp, "# The common_* event handler fields are the most useful "
 562                 "fields common to\n");
 563
 564         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 565                 "the 'common_*' fields\n");
 566
 567         fprintf(ofp, "# in the format files.  Those fields not available as "
 568                 "handler params can\n");
 569
 570         fprintf(ofp, "# be retrieved using Perl functions of the form "
 571                 "common_*($context).\n");
 572
 573         fprintf(ofp, "# See Context.pm for the list of available "
 574                 "functions.\n\n");
 575
 576         fprintf(ofp, "use lib \"$ENV{'PERF_EXEC_PATH'}/scripts/perl/"
 577                 "Perf-Trace-Util/lib\";\n");
 578
 579         fprintf(ofp, "use lib \"./Perf-Trace-Util/lib\";\n");
 580         fprintf(ofp, "use Perf::Trace::Core;\n");
 581         fprintf(ofp, "use Perf::Trace::Context;\n");
 582         fprintf(ofp, "use Perf::Trace::Util;\n\n");
 583
 584         fprintf(ofp, "sub trace_begin\n{\n\t# optional\n}\n\n");
 585         fprintf(ofp, "sub trace_end\n{\n\t# optional\n}\n");
 586
 587
 588         fprintf(ofp, "\n\
 589 sub print_backtrace\n\
 590 {\n\
 591         my $callchain = shift;\n\
 592         for my $node (@$callchain)\n\
 593         {\n\
 594                 if(exists $node->{sym})\n\
 595                 {\n\
 596                         printf( \"\\t[\\%%x] \\%%s\\n\", $node->{ip}, $node->{sym}{name});\n\
 597                 }\n\
 598                 else\n\
 599                 {\n\
 600                         printf( \"\\t[\\%%x]\\n\", $node{ip});\n\
 601                 }\n\
 602         }\n\
 603 }\n\n\
 604 ");
 605
 606
 607         while ((event = trace_find_next_event(pevent, event))) {
 608                 fprintf(ofp, "sub %s::%s\n{\n", event->system, event->name);
 609                 fprintf(ofp, "\tmy (");
 610
 611                 fprintf(ofp, "$event_name, ");
 612                 fprintf(ofp, "$context, ");
 613                 fprintf(ofp, "$common_cpu, ");
 614                 fprintf(ofp, "$common_secs, ");
 615                 fprintf(ofp, "$common_nsecs,\n");
 616                 fprintf(ofp, "\t    $common_pid, ");
 617                 fprintf(ofp, "$common_comm, ");
 618                 fprintf(ofp, "$common_callchain,\n\t    ");
 619
 620                 not_first = 0;
 621                 count = 0;
 622
 623                 for (f = event->format.fields; f; f = f->next) {
 624                         if (not_first++)
 625                                 fprintf(ofp, ", ");
 626                         if (++count % 5 == 0)
 627                                 fprintf(ofp, "\n\t    ");
 628
 629                         fprintf(ofp, "$%s", f->name);
 630                 }
 631                 fprintf(ofp, ") = @_;\n\n");
 632
 633                 fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
 634                         "$common_secs, $common_nsecs,\n\t             "
 635                         "$common_pid, $common_comm, $common_callchain);\n\n");
 636
 637                 fprintf(ofp, "\tprintf(\"");
 638
 639                 not_first = 0;
 640                 count = 0;
 641
 642                 for (f = event->format.fields; f; f = f->next) {
 643                         if (not_first++)
 644                                 fprintf(ofp, ", ");
 645                         if (count && count % 4 == 0) {
 646                                 fprintf(ofp, "\".\n\t       \"");
 647                         }
 648                         count++;
 649
 650                         fprintf(ofp, "%s=", f->name);
 651                         if (f->flags & TEP_FIELD_IS_STRING ||
 652                             f->flags & TEP_FIELD_IS_FLAG ||
 653                             f->flags & TEP_FIELD_IS_SYMBOLIC)
 654                                 fprintf(ofp, "%%s");
 655                         else if (f->flags & TEP_FIELD_IS_SIGNED)
 656                                 fprintf(ofp, "%%d");
 657                         else
 658                                 fprintf(ofp, "%%u");
 659                 }
 660
 661                 fprintf(ofp, "\\n\",\n\t       ");
 662
 663                 not_first = 0;
 664                 count = 0;
 665
 666                 for (f = event->format.fields; f; f = f->next) {
 667                         if (not_first++)
 668                                 fprintf(ofp, ", ");
 669
 670                         if (++count % 5 == 0)
 671                                 fprintf(ofp, "\n\t       ");
 672
 673                         if (f->flags & TEP_FIELD_IS_FLAG) {
 674                                 if ((count - 1) % 5 != 0) {
 675                                         fprintf(ofp, "\n\t       ");
 676                                         count = 4;
 677                                 }
 678                                 fprintf(ofp, "flag_str(\"");
 679                                 fprintf(ofp, "%s::%s\", ", event->system,
 680                                         event->name);
 681                                 fprintf(ofp, "\"%s\", $%s)", f->name,
 682                                         f->name);
 683                         } else if (f->flags & TEP_FIELD_IS_SYMBOLIC) {
 684                                 if ((count - 1) % 5 != 0) {
 685                                         fprintf(ofp, "\n\t       ");
 686                                         count = 4;
 687                                 }
 688                                 fprintf(ofp, "symbol_str(\"");
 689                                 fprintf(ofp, "%s::%s\", ", event->system,
 690                                         event->name);
 691                                 fprintf(ofp, "\"%s\", $%s)", f->name,
 692                                         f->name);
 693                         } else
 694                                 fprintf(ofp, "$%s", f->name);
 695                 }
 696
 697                 fprintf(ofp, ");\n\n");
 698
 699                 fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
 700
 701                 fprintf(ofp, "}\n\n");
 702         }
 703
 704         fprintf(ofp, "sub trace_unhandled\n{\n\tmy ($event_name, $context, "
 705                 "$common_cpu, $common_secs, $common_nsecs,\n\t    "
 706                 "$common_pid, $common_comm, $common_callchain) = @_;\n\n");
 707
 708         fprintf(ofp, "\tprint_header($event_name, $common_cpu, "
 709                 "$common_secs, $common_nsecs,\n\t             $common_pid, "
 710                 "$common_comm, $common_callchain);\n");
 711         fprintf(ofp, "\tprint_backtrace($common_callchain);\n");
 712         fprintf(ofp, "}\n\n");
 713
 714         fprintf(ofp, "sub print_header\n{\n"
 715                 "\tmy ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;\n\n"
 716                 "\tprintf(\"%%-20s %%5u %%05u.%%09u %%8u %%-20s \",\n\t       "
 717                 "$event_name, $cpu, $secs, $nsecs, $pid, $comm);\n}\n");
 718
 719         fprintf(ofp,
 720                 "\n# Packed byte string args of process_event():\n"
 721                 "#\n"
 722                 "# $event:\tunion perf_event\tutil/event.h\n"
 723                 "# $attr:\tstruct perf_event_attr\tlinux/perf_event.h\n"
 724                 "# $sample:\tstruct perf_sample\tutil/event.h\n"
 725                 "# $raw_data:\tperf_sample->raw_data\tutil/event.h\n"
 726                 "\n"
 727                 "sub process_event\n"
 728                 "{\n"
 729                 "\tmy ($event, $attr, $sample, $raw_data) = @_;\n"
 730                 "\n"
 731                 "\tmy @event\t= unpack(\"LSS\", $event);\n"
 732                 "\tmy @attr\t= unpack(\"LLQQQQQLLQQ\", $attr);\n"
 733                 "\tmy @sample\t= unpack(\"QLLQQQQQLL\", $sample);\n"
 734                 "\tmy @raw_data\t= unpack(\"C*\", $raw_data);\n"
 735                 "\n"
 736                 "\tuse Data::Dumper;\n"
 737                 "\tprint Dumper \\@event, \\@attr, \\@sample, \\@raw_data;\n"
 738                 "}\n");
 739
 740         fclose(ofp);
 741
 742         fprintf(stderr, "generated Perl script: %s\n", fname);
 743
 744         return 0;
 745 }
 746
 747 struct scripting_ops perl_scripting_ops = {
 748         .name = "Perl",
 749         .start_script = perl_start_script,
 750         .flush_script = perl_flush_script,
 751         .stop_script = perl_stop_script,
 752         .process_event = perl_process_event,
 753         .generate_script = perl_generate_script,
 754 };