tools/perf/util/scripting-engines/trace-event-python.c

   1 /*
   2  * trace-event-python.  Feed trace events to an embedded Python interpreter.
   3  *
   4  * Copyright (C) 2010 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 <Python.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <errno.h>
  28
  29 #include "../../perf.h"
  30 #include "../evsel.h"
  31 #include "../util.h"
  32 #include "../event.h"
  33 #include "../thread.h"
  34 #include "../trace-event.h"
  35 #include "../evsel.h"
  36
  37 PyMODINIT_FUNC initperf_trace_context(void);
  38
  39 #define FTRACE_MAX_EVENT                                \
  40         ((1 << (sizeof(unsigned short) * 8)) - 1)
  41
  42 struct event_format *events[FTRACE_MAX_EVENT];
  43
  44 #define MAX_FIELDS      64
  45 #define N_COMMON_FIELDS 7
  46
  47 extern struct scripting_context *scripting_context;
  48
  49 static char *cur_field_name;
  50 static int zero_flag_atom;
  51
  52 static PyObject *main_module, *main_dict;
  53
  54 static void handler_call_die(const char *handler_name)
  55 {
  56         PyErr_Print();
  57         Py_FatalError("problem in Python trace event handler");
  58 }
  59
  60 static void define_value(enum print_arg_type field_type,
  61                          const char *ev_name,
  62                          const char *field_name,
  63                          const char *field_value,
  64                          const char *field_str)
  65 {
  66         const char *handler_name = "define_flag_value";
  67         PyObject *handler, *t, *retval;
  68         unsigned long long value;
  69         unsigned n = 0;
  70
  71         if (field_type == PRINT_SYMBOL)
  72                 handler_name = "define_symbolic_value";
  73
  74         t = PyTuple_New(4);
  75         if (!t)
  76                 Py_FatalError("couldn't create Python tuple");
  77
  78         value = eval_flag(field_value);
  79
  80         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
  81         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
  82         PyTuple_SetItem(t, n++, PyInt_FromLong(value));
  83         PyTuple_SetItem(t, n++, PyString_FromString(field_str));
  84
  85         handler = PyDict_GetItemString(main_dict, handler_name);
  86         if (handler && PyCallable_Check(handler)) {
  87                 retval = PyObject_CallObject(handler, t);
  88                 if (retval == NULL)
  89                         handler_call_die(handler_name);
  90         }
  91
  92         Py_DECREF(t);
  93 }
  94
  95 static void define_values(enum print_arg_type field_type,
  96                           struct print_flag_sym *field,
  97                           const char *ev_name,
  98                           const char *field_name)
  99 {
 100         define_value(field_type, ev_name, field_name, field->value,
 101                      field->str);
 102
 103         if (field->next)
 104                 define_values(field_type, field->next, ev_name, field_name);
 105 }
 106
 107 static void define_field(enum print_arg_type field_type,
 108                          const char *ev_name,
 109                          const char *field_name,
 110                          const char *delim)
 111 {
 112         const char *handler_name = "define_flag_field";
 113         PyObject *handler, *t, *retval;
 114         unsigned n = 0;
 115
 116         if (field_type == PRINT_SYMBOL)
 117                 handler_name = "define_symbolic_field";
 118
 119         if (field_type == PRINT_FLAGS)
 120                 t = PyTuple_New(3);
 121         else
 122                 t = PyTuple_New(2);
 123         if (!t)
 124                 Py_FatalError("couldn't create Python tuple");
 125
 126         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
 127         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
 128         if (field_type == PRINT_FLAGS)
 129                 PyTuple_SetItem(t, n++, PyString_FromString(delim));
 130
 131         handler = PyDict_GetItemString(main_dict, handler_name);
 132         if (handler && PyCallable_Check(handler)) {
 133                 retval = PyObject_CallObject(handler, t);
 134                 if (retval == NULL)
 135                         handler_call_die(handler_name);
 136         }
 137
 138         Py_DECREF(t);
 139 }
 140
 141 static void define_event_symbols(struct event_format *event,
 142                                  const char *ev_name,
 143                                  struct print_arg *args)
 144 {
 145         switch (args->type) {
 146         case PRINT_NULL:
 147                 break;
 148         case PRINT_ATOM:
 149                 define_value(PRINT_FLAGS, ev_name, cur_field_name, "0",
 150                              args->atom.atom);
 151                 zero_flag_atom = 0;
 152                 break;
 153         case PRINT_FIELD:
 154                 if (cur_field_name)
 155                         free(cur_field_name);
 156                 cur_field_name = strdup(args->field.name);
 157                 break;
 158         case PRINT_FLAGS:
 159                 define_event_symbols(event, ev_name, args->flags.field);
 160                 define_field(PRINT_FLAGS, ev_name, cur_field_name,
 161                              args->flags.delim);
 162                 define_values(PRINT_FLAGS, args->flags.flags, ev_name,
 163                               cur_field_name);
 164                 break;
 165         case PRINT_SYMBOL:
 166                 define_event_symbols(event, ev_name, args->symbol.field);
 167                 define_field(PRINT_SYMBOL, ev_name, cur_field_name, NULL);
 168                 define_values(PRINT_SYMBOL, args->symbol.symbols, ev_name,
 169                               cur_field_name);
 170                 break;
 171         case PRINT_HEX:
 172                 define_event_symbols(event, ev_name, args->hex.field);
 173                 define_event_symbols(event, ev_name, args->hex.size);
 174                 break;
 175         case PRINT_STRING:
 176                 break;
 177         case PRINT_TYPE:
 178                 define_event_symbols(event, ev_name, args->typecast.item);
 179                 break;
 180         case PRINT_OP:
 181                 if (strcmp(args->op.op, ":") == 0)
 182                         zero_flag_atom = 1;
 183                 define_event_symbols(event, ev_name, args->op.left);
 184                 define_event_symbols(event, ev_name, args->op.right);
 185                 break;
 186         default:
 187                 /* gcc warns for these? */
 188         case PRINT_BSTRING:
 189         case PRINT_DYNAMIC_ARRAY:
 190         case PRINT_FUNC:
 191                 /* we should warn... */
 192                 return;
 193         }
 194
 195         if (args->next)
 196                 define_event_symbols(event, ev_name, args->next);
 197 }
 198
 199 static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 200 {
 201         static char ev_name[256];
 202         struct event_format *event;
 203         int type = evsel->attr.config;
 204
 205         /*
 206          * XXX: Do we really need to cache this since now we have evsel->tp_format
 207          * cached already? Need to re-read this "cache" routine that as well calls
 208          * define_event_symbols() :-\
 209          */
 210         if (events[type])
 211                 return events[type];
 212
 213         events[type] = event = evsel->tp_format;
 214         if (!event)
 215                 return NULL;
 216
 217         sprintf(ev_name, "%s__%s", event->system, event->name);
 218
 219         define_event_symbols(event, ev_name, event->print_fmt.args);
 220
 221         return event;
 222 }
 223
 224 static void python_process_tracepoint(union perf_event *perf_event
 225                                       __maybe_unused,
 226                                  struct perf_sample *sample,
 227                                  struct perf_evsel *evsel,
 228                                  struct machine *machine __maybe_unused,
 229                                  struct addr_location *al)
 230 {
 231         PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;
 232         static char handler_name[256];
 233         struct format_field *field;
 234         unsigned long long val;
 235         unsigned long s, ns;
 236         struct event_format *event;
 237         unsigned n = 0;
 238         int pid;
 239         int cpu = sample->cpu;
 240         void *data = sample->raw_data;
 241         unsigned long long nsecs = sample->time;
 242         struct thread *thread = al->thread;
 243         char *comm = thread->comm;
 244
 245         t = PyTuple_New(MAX_FIELDS);
 246         if (!t)
 247                 Py_FatalError("couldn't create Python tuple");
 248
 249         event = find_cache_event(evsel);
 250         if (!event)
 251                 die("ug! no event found for type %d", (int)evsel->attr.config);
 252
 253         pid = raw_field_value(event, "common_pid", data);
 254
 255         sprintf(handler_name, "%s__%s", event->system, event->name);
 256
 257         handler = PyDict_GetItemString(main_dict, handler_name);
 258         if (handler && !PyCallable_Check(handler))
 259                 handler = NULL;
 260         if (!handler) {
 261                 dict = PyDict_New();
 262                 if (!dict)
 263                         Py_FatalError("couldn't create Python dict");
 264         }
 265         s = nsecs / NSECS_PER_SEC;
 266         ns = nsecs - s * NSECS_PER_SEC;
 267
 268         scripting_context->event_data = data;
 269
 270         context = PyCObject_FromVoidPtr(scripting_context, NULL);
 271
 272         PyTuple_SetItem(t, n++, PyString_FromString(handler_name));
 273         PyTuple_SetItem(t, n++, context);
 274
 275         if (handler) {
 276                 PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
 277                 PyTuple_SetItem(t, n++, PyInt_FromLong(s));
 278                 PyTuple_SetItem(t, n++, PyInt_FromLong(ns));
 279                 PyTuple_SetItem(t, n++, PyInt_FromLong(pid));
 280                 PyTuple_SetItem(t, n++, PyString_FromString(comm));
 281         } else {
 282                 PyDict_SetItemString(dict, "common_cpu", PyInt_FromLong(cpu));
 283                 PyDict_SetItemString(dict, "common_s", PyInt_FromLong(s));
 284                 PyDict_SetItemString(dict, "common_ns", PyInt_FromLong(ns));
 285                 PyDict_SetItemString(dict, "common_pid", PyInt_FromLong(pid));
 286                 PyDict_SetItemString(dict, "common_comm", PyString_FromString(comm));
 287         }
 288         for (field = event->format.fields; field; field = field->next) {
 289                 if (field->flags & FIELD_IS_STRING) {
 290                         int offset;
 291                         if (field->flags & FIELD_IS_DYNAMIC) {
 292                                 offset = *(int *)(data + field->offset);
 293                                 offset &= 0xffff;
 294                         } else
 295                                 offset = field->offset;
 296                         obj = PyString_FromString((char *)data + offset);
 297                 } else { /* FIELD_IS_NUMERIC */
 298                         val = read_size(event, data + field->offset,
 299                                         field->size);
 300                         if (field->flags & FIELD_IS_SIGNED) {
 301                                 if ((long long)val >= LONG_MIN &&
 302                                     (long long)val <= LONG_MAX)
 303                                         obj = PyInt_FromLong(val);
 304                                 else
 305                                         obj = PyLong_FromLongLong(val);
 306                         } else {
 307                                 if (val <= LONG_MAX)
 308                                         obj = PyInt_FromLong(val);
 309                                 else
 310                                         obj = PyLong_FromUnsignedLongLong(val);
 311                         }
 312                 }
 313                 if (handler)
 314                         PyTuple_SetItem(t, n++, obj);
 315                 else
 316                         PyDict_SetItemString(dict, field->name, obj);
 317
 318         }
 319         if (!handler)
 320                 PyTuple_SetItem(t, n++, dict);
 321
 322         if (_PyTuple_Resize(&t, n) == -1)
 323                 Py_FatalError("error resizing Python tuple");
 324
 325         if (handler) {
 326                 retval = PyObject_CallObject(handler, t);
 327                 if (retval == NULL)
 328                         handler_call_die(handler_name);
 329         } else {
 330                 handler = PyDict_GetItemString(main_dict, "trace_unhandled");
 331                 if (handler && PyCallable_Check(handler)) {
 332
 333                         retval = PyObject_CallObject(handler, t);
 334                         if (retval == NULL)
 335                                 handler_call_die("trace_unhandled");
 336                 }
 337                 Py_DECREF(dict);
 338         }
 339
 340         Py_DECREF(t);
 341 }
 342
 343 static void python_process_general_event(union perf_event *perf_event
 344                                          __maybe_unused,
 345                                          struct perf_sample *sample,
 346                                          struct perf_evsel *evsel,
 347                                          struct machine *machine __maybe_unused,
 348                                          struct addr_location *al)
 349 {
 350         PyObject *handler, *retval, *t, *dict;
 351         static char handler_name[64];
 352         unsigned n = 0;
 353         struct thread *thread = al->thread;
 354
 355         /*
 356          * Use the MAX_FIELDS to make the function expandable, though
 357          * currently there is only one item for the tuple.
 358          */
 359         t = PyTuple_New(MAX_FIELDS);
 360         if (!t)
 361                 Py_FatalError("couldn't create Python tuple");
 362
 363         dict = PyDict_New();
 364         if (!dict)
 365                 Py_FatalError("couldn't create Python dictionary");
 366
 367         snprintf(handler_name, sizeof(handler_name), "%s", "process_event");
 368
 369         handler = PyDict_GetItemString(main_dict, handler_name);
 370         if (!handler || !PyCallable_Check(handler))
 371                 goto exit;
 372
 373         PyDict_SetItemString(dict, "ev_name", PyString_FromString(perf_evsel__name(evsel)));
 374         PyDict_SetItemString(dict, "attr", PyString_FromStringAndSize(
 375                         (const char *)&evsel->attr, sizeof(evsel->attr)));
 376         PyDict_SetItemString(dict, "sample", PyString_FromStringAndSize(
 377                         (const char *)sample, sizeof(*sample)));
 378         PyDict_SetItemString(dict, "raw_buf", PyString_FromStringAndSize(
 379                         (const char *)sample->raw_data, sample->raw_size));
 380         PyDict_SetItemString(dict, "comm",
 381                         PyString_FromString(thread->comm));
 382         if (al->map) {
 383                 PyDict_SetItemString(dict, "dso",
 384                         PyString_FromString(al->map->dso->name));
 385         }
 386         if (al->sym) {
 387                 PyDict_SetItemString(dict, "symbol",
 388                         PyString_FromString(al->sym->name));
 389         }
 390
 391         PyTuple_SetItem(t, n++, dict);
 392         if (_PyTuple_Resize(&t, n) == -1)
 393                 Py_FatalError("error resizing Python tuple");
 394
 395         retval = PyObject_CallObject(handler, t);
 396         if (retval == NULL)
 397                 handler_call_die(handler_name);
 398 exit:
 399         Py_DECREF(dict);
 400         Py_DECREF(t);
 401 }
 402
 403 static void python_process_event(union perf_event *perf_event,
 404                                  struct perf_sample *sample,
 405                                  struct perf_evsel *evsel,
 406                                  struct machine *machine,
 407                                  struct addr_location *al)
 408 {
 409         switch (evsel->attr.type) {
 410         case PERF_TYPE_TRACEPOINT:
 411                 python_process_tracepoint(perf_event, sample, evsel,
 412                                           machine, al);
 413                 break;
 414         /* Reserve for future process_hw/sw/raw APIs */
 415         default:
 416                 python_process_general_event(perf_event, sample, evsel,
 417                                              machine, al);
 418         }
 419 }
 420
 421 static int run_start_sub(void)
 422 {
 423         PyObject *handler, *retval;
 424         int err = 0;
 425
 426         main_module = PyImport_AddModule("__main__");
 427         if (main_module == NULL)
 428                 return -1;
 429         Py_INCREF(main_module);
 430
 431         main_dict = PyModule_GetDict(main_module);
 432         if (main_dict == NULL) {
 433                 err = -1;
 434                 goto error;
 435         }
 436         Py_INCREF(main_dict);
 437
 438         handler = PyDict_GetItemString(main_dict, "trace_begin");
 439         if (handler == NULL || !PyCallable_Check(handler))
 440                 goto out;
 441
 442         retval = PyObject_CallObject(handler, NULL);
 443         if (retval == NULL)
 444                 handler_call_die("trace_begin");
 445
 446         Py_DECREF(retval);
 447         return err;
 448 error:
 449         Py_XDECREF(main_dict);
 450         Py_XDECREF(main_module);
 451 out:
 452         return err;
 453 }
 454
 455 /*
 456  * Start trace script
 457  */
 458 static int python_start_script(const char *script, int argc, const char **argv)
 459 {
 460         const char **command_line;
 461         char buf[PATH_MAX];
 462         int i, err = 0;
 463         FILE *fp;
 464
 465         command_line = malloc((argc + 1) * sizeof(const char *));
 466         command_line[0] = script;
 467         for (i = 1; i < argc + 1; i++)
 468                 command_line[i] = argv[i - 1];
 469
 470         Py_Initialize();
 471
 472         initperf_trace_context();
 473
 474         PySys_SetArgv(argc + 1, (char **)command_line);
 475
 476         fp = fopen(script, "r");
 477         if (!fp) {
 478                 sprintf(buf, "Can't open python script \"%s\"", script);
 479                 perror(buf);
 480                 err = -1;
 481                 goto error;
 482         }
 483
 484         err = PyRun_SimpleFile(fp, script);
 485         if (err) {
 486                 fprintf(stderr, "Error running python script %s\n", script);
 487                 goto error;
 488         }
 489
 490         err = run_start_sub();
 491         if (err) {
 492                 fprintf(stderr, "Error starting python script %s\n", script);
 493                 goto error;
 494         }
 495
 496         free(command_line);
 497
 498         return err;
 499 error:
 500         Py_Finalize();
 501         free(command_line);
 502
 503         return err;
 504 }
 505
 506 /*
 507  * Stop trace script
 508  */
 509 static int python_stop_script(void)
 510 {
 511         PyObject *handler, *retval;
 512         int err = 0;
 513
 514         handler = PyDict_GetItemString(main_dict, "trace_end");
 515         if (handler == NULL || !PyCallable_Check(handler))
 516                 goto out;
 517
 518         retval = PyObject_CallObject(handler, NULL);
 519         if (retval == NULL)
 520                 handler_call_die("trace_end");
 521         else
 522                 Py_DECREF(retval);
 523 out:
 524         Py_XDECREF(main_dict);
 525         Py_XDECREF(main_module);
 526         Py_Finalize();
 527
 528         return err;
 529 }
 530
 531 static int python_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.py", outfile);
 540         ofp = fopen(fname, "w");
 541         if (ofp == NULL) {
 542                 fprintf(stderr, "couldn't open %s\n", fname);
 543                 return -1;
 544         }
 545         fprintf(ofp, "# perf script event handlers, "
 546                 "generated by perf script -g python\n");
 547
 548         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 549                 " License version 2\n\n");
 550
 551         fprintf(ofp, "# The common_* event handler fields are the most useful "
 552                 "fields common to\n");
 553
 554         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 555                 "the 'common_*' fields\n");
 556
 557         fprintf(ofp, "# in the format files.  Those fields not available as "
 558                 "handler params can\n");
 559
 560         fprintf(ofp, "# be retrieved using Python functions of the form "
 561                 "common_*(context).\n");
 562
 563         fprintf(ofp, "# See the perf-trace-python Documentation for the list "
 564                 "of available functions.\n\n");
 565
 566         fprintf(ofp, "import os\n");
 567         fprintf(ofp, "import sys\n\n");
 568
 569         fprintf(ofp, "sys.path.append(os.environ['PERF_EXEC_PATH'] + \\\n");
 570         fprintf(ofp, "\t'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')\n");
 571         fprintf(ofp, "\nfrom perf_trace_context import *\n");
 572         fprintf(ofp, "from Core import *\n\n\n");
 573
 574         fprintf(ofp, "def trace_begin():\n");
 575         fprintf(ofp, "\tprint \"in trace_begin\"\n\n");
 576
 577         fprintf(ofp, "def trace_end():\n");
 578         fprintf(ofp, "\tprint \"in trace_end\"\n\n");
 579
 580         while ((event = trace_find_next_event(pevent, event))) {
 581                 fprintf(ofp, "def %s__%s(", event->system, event->name);
 582                 fprintf(ofp, "event_name, ");
 583                 fprintf(ofp, "context, ");
 584                 fprintf(ofp, "common_cpu,\n");
 585                 fprintf(ofp, "\tcommon_secs, ");
 586                 fprintf(ofp, "common_nsecs, ");
 587                 fprintf(ofp, "common_pid, ");
 588                 fprintf(ofp, "common_comm,\n\t");
 589
 590                 not_first = 0;
 591                 count = 0;
 592
 593                 for (f = event->format.fields; f; f = f->next) {
 594                         if (not_first++)
 595                                 fprintf(ofp, ", ");
 596                         if (++count % 5 == 0)
 597                                 fprintf(ofp, "\n\t");
 598
 599                         fprintf(ofp, "%s", f->name);
 600                 }
 601                 fprintf(ofp, "):\n");
 602
 603                 fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
 604                         "common_secs, common_nsecs,\n\t\t\t"
 605                         "common_pid, common_comm)\n\n");
 606
 607                 fprintf(ofp, "\t\tprint \"");
 608
 609                 not_first = 0;
 610                 count = 0;
 611
 612                 for (f = event->format.fields; f; f = f->next) {
 613                         if (not_first++)
 614                                 fprintf(ofp, ", ");
 615                         if (count && count % 3 == 0) {
 616                                 fprintf(ofp, "\" \\\n\t\t\"");
 617                         }
 618                         count++;
 619
 620                         fprintf(ofp, "%s=", f->name);
 621                         if (f->flags & FIELD_IS_STRING ||
 622                             f->flags & FIELD_IS_FLAG ||
 623                             f->flags & FIELD_IS_SYMBOLIC)
 624                                 fprintf(ofp, "%%s");
 625                         else if (f->flags & FIELD_IS_SIGNED)
 626                                 fprintf(ofp, "%%d");
 627                         else
 628                                 fprintf(ofp, "%%u");
 629                 }
 630
 631                 fprintf(ofp, "\\n\" %% \\\n\t\t(");
 632
 633                 not_first = 0;
 634                 count = 0;
 635
 636                 for (f = event->format.fields; f; f = f->next) {
 637                         if (not_first++)
 638                                 fprintf(ofp, ", ");
 639
 640                         if (++count % 5 == 0)
 641                                 fprintf(ofp, "\n\t\t");
 642
 643                         if (f->flags & FIELD_IS_FLAG) {
 644                                 if ((count - 1) % 5 != 0) {
 645                                         fprintf(ofp, "\n\t\t");
 646                                         count = 4;
 647                                 }
 648                                 fprintf(ofp, "flag_str(\"");
 649                                 fprintf(ofp, "%s__%s\", ", event->system,
 650                                         event->name);
 651                                 fprintf(ofp, "\"%s\", %s)", f->name,
 652                                         f->name);
 653                         } else if (f->flags & FIELD_IS_SYMBOLIC) {
 654                                 if ((count - 1) % 5 != 0) {
 655                                         fprintf(ofp, "\n\t\t");
 656                                         count = 4;
 657                                 }
 658                                 fprintf(ofp, "symbol_str(\"");
 659                                 fprintf(ofp, "%s__%s\", ", event->system,
 660                                         event->name);
 661                                 fprintf(ofp, "\"%s\", %s)", f->name,
 662                                         f->name);
 663                         } else
 664                                 fprintf(ofp, "%s", f->name);
 665                 }
 666
 667                 fprintf(ofp, "),\n\n");
 668         }
 669
 670         fprintf(ofp, "def trace_unhandled(event_name, context, "
 671                 "event_fields_dict):\n");
 672
 673         fprintf(ofp, "\t\tprint ' '.join(['%%s=%%s'%%(k,str(v))"
 674                 "for k,v in sorted(event_fields_dict.items())])\n\n");
 675
 676         fprintf(ofp, "def print_header("
 677                 "event_name, cpu, secs, nsecs, pid, comm):\n"
 678                 "\tprint \"%%-20s %%5u %%05u.%%09u %%8u %%-20s \" %% \\\n\t"
 679                 "(event_name, cpu, secs, nsecs, pid, comm),\n");
 680
 681         fclose(ofp);
 682
 683         fprintf(stderr, "generated Python script: %s\n", fname);
 684
 685         return 0;
 686 }
 687
 688 struct scripting_ops python_scripting_ops = {
 689         .name = "Python",
 690         .start_script = python_start_script,
 691         .stop_script = python_stop_script,
 692         .process_event = python_process_event,
 693         .generate_script = python_generate_script,
 694 };