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