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
  36 PyMODINIT_FUNC initperf_trace_context(void);
  37
  38 #define FTRACE_MAX_EVENT                                \
  39         ((1 << (sizeof(unsigned short) * 8)) - 1)
  40
  41 struct event_format *events[FTRACE_MAX_EVENT];
  42
  43 #define MAX_FIELDS      64
  44 #define N_COMMON_FIELDS 7
  45
  46 extern struct scripting_context *scripting_context;
  47
  48 static char *cur_field_name;
  49 static int zero_flag_atom;
  50
  51 static PyObject *main_module, *main_dict;
  52
  53 static void handler_call_die(const char *handler_name)
  54 {
  55         PyErr_Print();
  56         Py_FatalError("problem in Python trace event handler");
  57 }
  58
  59 static void define_value(enum print_arg_type field_type,
  60                          const char *ev_name,
  61                          const char *field_name,
  62                          const char *field_value,
  63                          const char *field_str)
  64 {
  65         const char *handler_name = "define_flag_value";
  66         PyObject *handler, *t, *retval;
  67         unsigned long long value;
  68         unsigned n = 0;
  69
  70         if (field_type == PRINT_SYMBOL)
  71                 handler_name = "define_symbolic_value";
  72
  73         t = PyTuple_New(4);
  74         if (!t)
  75                 Py_FatalError("couldn't create Python tuple");
  76
  77         value = eval_flag(field_value);
  78
  79         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
  80         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
  81         PyTuple_SetItem(t, n++, PyInt_FromLong(value));
  82         PyTuple_SetItem(t, n++, PyString_FromString(field_str));
  83
  84         handler = PyDict_GetItemString(main_dict, handler_name);
  85         if (handler && PyCallable_Check(handler)) {
  86                 retval = PyObject_CallObject(handler, t);
  87                 if (retval == NULL)
  88                         handler_call_die(handler_name);
  89         }
  90
  91         Py_DECREF(t);
  92 }
  93
  94 static void define_values(enum print_arg_type field_type,
  95                           struct print_flag_sym *field,
  96                           const char *ev_name,
  97                           const char *field_name)
  98 {
  99         define_value(field_type, ev_name, field_name, field->value,
 100                      field->str);
 101
 102         if (field->next)
 103                 define_values(field_type, field->next, ev_name, field_name);
 104 }
 105
 106 static void define_field(enum print_arg_type field_type,
 107                          const char *ev_name,
 108                          const char *field_name,
 109                          const char *delim)
 110 {
 111         const char *handler_name = "define_flag_field";
 112         PyObject *handler, *t, *retval;
 113         unsigned n = 0;
 114
 115         if (field_type == PRINT_SYMBOL)
 116                 handler_name = "define_symbolic_field";
 117
 118         if (field_type == PRINT_FLAGS)
 119                 t = PyTuple_New(3);
 120         else
 121                 t = PyTuple_New(2);
 122         if (!t)
 123                 Py_FatalError("couldn't create Python tuple");
 124
 125         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
 126         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
 127         if (field_type == PRINT_FLAGS)
 128                 PyTuple_SetItem(t, n++, PyString_FromString(delim));
 129
 130         handler = PyDict_GetItemString(main_dict, handler_name);
 131         if (handler && PyCallable_Check(handler)) {
 132                 retval = PyObject_CallObject(handler, t);
 133                 if (retval == NULL)
 134                         handler_call_die(handler_name);
 135         }
 136
 137         Py_DECREF(t);
 138 }
 139
 140 static void define_event_symbols(struct event_format *event,
 141                                  const char *ev_name,
 142                                  struct print_arg *args)
 143 {
 144         switch (args->type) {
 145         case PRINT_NULL:
 146                 break;
 147         case PRINT_ATOM:
 148                 define_value(PRINT_FLAGS, ev_name, cur_field_name, "0",
 149                              args->atom.atom);
 150                 zero_flag_atom = 0;
 151                 break;
 152         case PRINT_FIELD:
 153                 if (cur_field_name)
 154                         free(cur_field_name);
 155                 cur_field_name = strdup(args->field.name);
 156                 break;
 157         case PRINT_FLAGS:
 158                 define_event_symbols(event, ev_name, args->flags.field);
 159                 define_field(PRINT_FLAGS, ev_name, cur_field_name,
 160                              args->flags.delim);
 161                 define_values(PRINT_FLAGS, args->flags.flags, ev_name,
 162                               cur_field_name);
 163                 break;
 164         case PRINT_SYMBOL:
 165                 define_event_symbols(event, ev_name, args->symbol.field);
 166                 define_field(PRINT_SYMBOL, ev_name, cur_field_name, NULL);
 167                 define_values(PRINT_SYMBOL, args->symbol.symbols, ev_name,
 168                               cur_field_name);
 169                 break;
 170         case PRINT_HEX:
 171                 define_event_symbols(event, ev_name, args->hex.field);
 172                 define_event_symbols(event, ev_name, args->hex.size);
 173                 break;
 174         case PRINT_STRING:
 175                 break;
 176         case PRINT_TYPE:
 177                 define_event_symbols(event, ev_name, args->typecast.item);
 178                 break;
 179         case PRINT_OP:
 180                 if (strcmp(args->op.op, ":") == 0)
 181                         zero_flag_atom = 1;
 182                 define_event_symbols(event, ev_name, args->op.left);
 183                 define_event_symbols(event, ev_name, args->op.right);
 184                 break;
 185         default:
 186                 /* gcc warns for these? */
 187         case PRINT_BSTRING:
 188         case PRINT_DYNAMIC_ARRAY:
 189         case PRINT_FUNC:
 190                 /* we should warn... */
 191                 return;
 192         }
 193
 194         if (args->next)
 195                 define_event_symbols(event, ev_name, args->next);
 196 }
 197
 198 static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 199 {
 200         static char ev_name[256];
 201         struct event_format *event;
 202         int type = evsel->attr.config;
 203
 204         /*
 205          * XXX: Do we really need to cache this since now we have evsel->tp_format
 206          * cached already? Need to re-read this "cache" routine that as well calls
 207          * define_event_symbols() :-\
 208          */
 209         if (events[type])
 210                 return events[type];
 211
 212         events[type] = event = evsel->tp_format;
 213         if (!event)
 214                 return NULL;
 215
 216         sprintf(ev_name, "%s__%s", event->system, event->name);
 217
 218         define_event_symbols(event, ev_name, event->print_fmt.args);
 219
 220         return event;
 221 }
 222
 223 static void python_process_tracepoint(union perf_event *perf_event
 224                                       __maybe_unused,
 225                                  struct perf_sample *sample,
 226                                  struct perf_evsel *evsel,
 227                                  struct machine *machine __maybe_unused,
 228                                  struct addr_location *al)
 229 {
 230         PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;
 231         static char handler_name[256];
 232         struct format_field *field;
 233         unsigned long long val;
 234         unsigned long s, ns;
 235         struct event_format *event;
 236         unsigned n = 0;
 237         int pid;
 238         int cpu = sample->cpu;
 239         void *data = sample->raw_data;
 240         unsigned long long nsecs = sample->time;
 241         struct thread *thread = al->thread;
 242         char *comm = thread->comm;
 243
 244         t = PyTuple_New(MAX_FIELDS);
 245         if (!t)
 246                 Py_FatalError("couldn't create Python tuple");
 247
 248         event = find_cache_event(evsel);
 249         if (!event)
 250                 die("ug! no event found for type %d", (int)evsel->attr.config);
 251
 252         pid = raw_field_value(event, "common_pid", data);
 253
 254         sprintf(handler_name, "%s__%s", event->system, event->name);
 255
 256         handler = PyDict_GetItemString(main_dict, handler_name);
 257         if (handler && !PyCallable_Check(handler))
 258                 handler = NULL;
 259         if (!handler) {
 260                 dict = PyDict_New();
 261                 if (!dict)
 262                         Py_FatalError("couldn't create Python dict");
 263         }
 264         s = nsecs / NSECS_PER_SEC;
 265         ns = nsecs - s * NSECS_PER_SEC;
 266
 267         scripting_context->event_data = data;
 268
 269         context = PyCObject_FromVoidPtr(scripting_context, NULL);
 270
 271         PyTuple_SetItem(t, n++, PyString_FromString(handler_name));
 272         PyTuple_SetItem(t, n++, context);
 273
 274         if (handler) {
 275                 PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
 276                 PyTuple_SetItem(t, n++, PyInt_FromLong(s));
 277                 PyTuple_SetItem(t, n++, PyInt_FromLong(ns));
 278                 PyTuple_SetItem(t, n++, PyInt_FromLong(pid));
 279                 PyTuple_SetItem(t, n++, PyString_FromString(comm));
 280         } else {
 281                 PyDict_SetItemString(dict, "common_cpu", PyInt_FromLong(cpu));
 282                 PyDict_SetItemString(dict, "common_s", PyInt_FromLong(s));
 283                 PyDict_SetItemString(dict, "common_ns", PyInt_FromLong(ns));
 284                 PyDict_SetItemString(dict, "common_pid", PyInt_FromLong(pid));
 285                 PyDict_SetItemString(dict, "common_comm", PyString_FromString(comm));
 286         }
 287         for (field = event->format.fields; field; field = field->next) {
 288                 if (field->flags & FIELD_IS_STRING) {
 289                         int offset;
 290                         if (field->flags & FIELD_IS_DYNAMIC) {
 291                                 offset = *(int *)(data + field->offset);
 292                                 offset &= 0xffff;
 293                         } else
 294                                 offset = field->offset;
 295                         obj = PyString_FromString((char *)data + offset);
 296                 } else { /* FIELD_IS_NUMERIC */
 297                         val = read_size(event, data + field->offset,
 298                                         field->size);
 299                         if (field->flags & FIELD_IS_SIGNED) {
 300                                 if ((long long)val >= LONG_MIN &&
 301                                     (long long)val <= LONG_MAX)
 302                                         obj = PyInt_FromLong(val);
 303                                 else
 304                                         obj = PyLong_FromLongLong(val);
 305                         } else {
 306                                 if (val <= LONG_MAX)
 307                                         obj = PyInt_FromLong(val);
 308                                 else
 309                                         obj = PyLong_FromUnsignedLongLong(val);
 310                         }
 311                 }
 312                 if (handler)
 313                         PyTuple_SetItem(t, n++, obj);
 314                 else
 315                         PyDict_SetItemString(dict, field->name, obj);
 316
 317         }
 318         if (!handler)
 319                 PyTuple_SetItem(t, n++, dict);
 320
 321         if (_PyTuple_Resize(&t, n) == -1)
 322                 Py_FatalError("error resizing Python tuple");
 323
 324         if (handler) {
 325                 retval = PyObject_CallObject(handler, t);
 326                 if (retval == NULL)
 327                         handler_call_die(handler_name);
 328         } else {
 329                 handler = PyDict_GetItemString(main_dict, "trace_unhandled");
 330                 if (handler && PyCallable_Check(handler)) {
 331
 332                         retval = PyObject_CallObject(handler, t);
 333                         if (retval == NULL)
 334                                 handler_call_die("trace_unhandled");
 335                 }
 336                 Py_DECREF(dict);
 337         }
 338
 339         Py_DECREF(t);
 340 }
 341
 342 static void python_process_general_event(union perf_event *perf_event
 343                                          __maybe_unused,
 344                                          struct perf_sample *sample,
 345                                          struct perf_evsel *evsel,
 346                                          struct machine *machine __maybe_unused,
 347                                          struct addr_location *al)
 348 {
 349         PyObject *handler, *retval, *t, *dict;
 350         static char handler_name[64];
 351         unsigned n = 0;
 352         struct thread *thread = al->thread;
 353
 354         /*
 355          * Use the MAX_FIELDS to make the function expandable, though
 356          * currently there is only one item for the tuple.
 357          */
 358         t = PyTuple_New(MAX_FIELDS);
 359         if (!t)
 360                 Py_FatalError("couldn't create Python tuple");
 361
 362         dict = PyDict_New();
 363         if (!dict)
 364                 Py_FatalError("couldn't create Python dictionary");
 365
 366         snprintf(handler_name, sizeof(handler_name), "%s", "process_event");
 367
 368         handler = PyDict_GetItemString(main_dict, handler_name);
 369         if (!handler || !PyCallable_Check(handler))
 370                 goto exit;
 371
 372         PyDict_SetItemString(dict, "ev_name", PyString_FromString(perf_evsel__name(evsel)));
 373         PyDict_SetItemString(dict, "attr", PyString_FromStringAndSize(
 374                         (const char *)&evsel->attr, sizeof(evsel->attr)));
 375         PyDict_SetItemString(dict, "sample", PyString_FromStringAndSize(
 376                         (const char *)sample, sizeof(*sample)));
 377         PyDict_SetItemString(dict, "raw_buf", PyString_FromStringAndSize(
 378                         (const char *)sample->raw_data, sample->raw_size));
 379         PyDict_SetItemString(dict, "comm",
 380                         PyString_FromString(thread->comm));
 381         if (al->map) {
 382                 PyDict_SetItemString(dict, "dso",
 383                         PyString_FromString(al->map->dso->name));
 384         }
 385         if (al->sym) {
 386                 PyDict_SetItemString(dict, "symbol",
 387                         PyString_FromString(al->sym->name));
 388         }
 389
 390         PyTuple_SetItem(t, n++, dict);
 391         if (_PyTuple_Resize(&t, n) == -1)
 392                 Py_FatalError("error resizing Python tuple");
 393
 394         retval = PyObject_CallObject(handler, t);
 395         if (retval == NULL)
 396                 handler_call_die(handler_name);
 397 exit:
 398         Py_DECREF(dict);
 399         Py_DECREF(t);
 400 }
 401
 402 static void python_process_event(union perf_event *perf_event,
 403                                  struct perf_sample *sample,
 404                                  struct perf_evsel *evsel,
 405                                  struct machine *machine,
 406                                  struct addr_location *al)
 407 {
 408         switch (evsel->attr.type) {
 409         case PERF_TYPE_TRACEPOINT:
 410                 python_process_tracepoint(perf_event, sample, evsel,
 411                                           machine, al);
 412                 break;
 413         /* Reserve for future process_hw/sw/raw APIs */
 414         default:
 415                 python_process_general_event(perf_event, sample, evsel,
 416                                              machine, al);
 417         }
 418 }
 419
 420 static int run_start_sub(void)
 421 {
 422         PyObject *handler, *retval;
 423         int err = 0;
 424
 425         main_module = PyImport_AddModule("__main__");
 426         if (main_module == NULL)
 427                 return -1;
 428         Py_INCREF(main_module);
 429
 430         main_dict = PyModule_GetDict(main_module);
 431         if (main_dict == NULL) {
 432                 err = -1;
 433                 goto error;
 434         }
 435         Py_INCREF(main_dict);
 436
 437         handler = PyDict_GetItemString(main_dict, "trace_begin");
 438         if (handler == NULL || !PyCallable_Check(handler))
 439                 goto out;
 440
 441         retval = PyObject_CallObject(handler, NULL);
 442         if (retval == NULL)
 443                 handler_call_die("trace_begin");
 444
 445         Py_DECREF(retval);
 446         return err;
 447 error:
 448         Py_XDECREF(main_dict);
 449         Py_XDECREF(main_module);
 450 out:
 451         return err;
 452 }
 453
 454 /*
 455  * Start trace script
 456  */
 457 static int python_start_script(const char *script, int argc, const char **argv)
 458 {
 459         const char **command_line;
 460         char buf[PATH_MAX];
 461         int i, err = 0;
 462         FILE *fp;
 463
 464         command_line = malloc((argc + 1) * sizeof(const char *));
 465         command_line[0] = script;
 466         for (i = 1; i < argc + 1; i++)
 467                 command_line[i] = argv[i - 1];
 468
 469         Py_Initialize();
 470
 471         initperf_trace_context();
 472
 473         PySys_SetArgv(argc + 1, (char **)command_line);
 474
 475         fp = fopen(script, "r");
 476         if (!fp) {
 477                 sprintf(buf, "Can't open python script \"%s\"", script);
 478                 perror(buf);
 479                 err = -1;
 480                 goto error;
 481         }
 482
 483         err = PyRun_SimpleFile(fp, script);
 484         if (err) {
 485                 fprintf(stderr, "Error running python script %s\n", script);
 486                 goto error;
 487         }
 488
 489         err = run_start_sub();
 490         if (err) {
 491                 fprintf(stderr, "Error starting python script %s\n", script);
 492                 goto error;
 493         }
 494
 495         free(command_line);
 496
 497         return err;
 498 error:
 499         Py_Finalize();
 500         free(command_line);
 501
 502         return err;
 503 }
 504
 505 /*
 506  * Stop trace script
 507  */
 508 static int python_stop_script(void)
 509 {
 510         PyObject *handler, *retval;
 511         int err = 0;
 512
 513         handler = PyDict_GetItemString(main_dict, "trace_end");
 514         if (handler == NULL || !PyCallable_Check(handler))
 515                 goto out;
 516
 517         retval = PyObject_CallObject(handler, NULL);
 518         if (retval == NULL)
 519                 handler_call_die("trace_end");
 520         else
 521                 Py_DECREF(retval);
 522 out:
 523         Py_XDECREF(main_dict);
 524         Py_XDECREF(main_module);
 525         Py_Finalize();
 526
 527         return err;
 528 }
 529
 530 static int python_generate_script(struct pevent *pevent, const char *outfile)
 531 {
 532         struct event_format *event = NULL;
 533         struct format_field *f;
 534         char fname[PATH_MAX];
 535         int not_first, count;
 536         FILE *ofp;
 537
 538         sprintf(fname, "%s.py", outfile);
 539         ofp = fopen(fname, "w");
 540         if (ofp == NULL) {
 541                 fprintf(stderr, "couldn't open %s\n", fname);
 542                 return -1;
 543         }
 544         fprintf(ofp, "# perf script event handlers, "
 545                 "generated by perf script -g python\n");
 546
 547         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 548                 " License version 2\n\n");
 549
 550         fprintf(ofp, "# The common_* event handler fields are the most useful "
 551                 "fields common to\n");
 552
 553         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 554                 "the 'common_*' fields\n");
 555
 556         fprintf(ofp, "# in the format files.  Those fields not available as "
 557                 "handler params can\n");
 558
 559         fprintf(ofp, "# be retrieved using Python functions of the form "
 560                 "common_*(context).\n");
 561
 562         fprintf(ofp, "# See the perf-trace-python Documentation for the list "
 563                 "of available functions.\n\n");
 564
 565         fprintf(ofp, "import os\n");
 566         fprintf(ofp, "import sys\n\n");
 567
 568         fprintf(ofp, "sys.path.append(os.environ['PERF_EXEC_PATH'] + \\\n");
 569         fprintf(ofp, "\t'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')\n");
 570         fprintf(ofp, "\nfrom perf_trace_context import *\n");
 571         fprintf(ofp, "from Core import *\n\n\n");
 572
 573         fprintf(ofp, "def trace_begin():\n");
 574         fprintf(ofp, "\tprint \"in trace_begin\"\n\n");
 575
 576         fprintf(ofp, "def trace_end():\n");
 577         fprintf(ofp, "\tprint \"in trace_end\"\n\n");
 578
 579         while ((event = trace_find_next_event(pevent, event))) {
 580                 fprintf(ofp, "def %s__%s(", event->system, event->name);
 581                 fprintf(ofp, "event_name, ");
 582                 fprintf(ofp, "context, ");
 583                 fprintf(ofp, "common_cpu,\n");
 584                 fprintf(ofp, "\tcommon_secs, ");
 585                 fprintf(ofp, "common_nsecs, ");
 586                 fprintf(ofp, "common_pid, ");
 587                 fprintf(ofp, "common_comm,\n\t");
 588
 589                 not_first = 0;
 590                 count = 0;
 591
 592                 for (f = event->format.fields; f; f = f->next) {
 593                         if (not_first++)
 594                                 fprintf(ofp, ", ");
 595                         if (++count % 5 == 0)
 596                                 fprintf(ofp, "\n\t");
 597
 598                         fprintf(ofp, "%s", f->name);
 599                 }
 600                 fprintf(ofp, "):\n");
 601
 602                 fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
 603                         "common_secs, common_nsecs,\n\t\t\t"
 604                         "common_pid, common_comm)\n\n");
 605
 606                 fprintf(ofp, "\t\tprint \"");
 607
 608                 not_first = 0;
 609                 count = 0;
 610
 611                 for (f = event->format.fields; f; f = f->next) {
 612                         if (not_first++)
 613                                 fprintf(ofp, ", ");
 614                         if (count && count % 3 == 0) {
 615                                 fprintf(ofp, "\" \\\n\t\t\"");
 616                         }
 617                         count++;
 618
 619                         fprintf(ofp, "%s=", f->name);
 620                         if (f->flags & FIELD_IS_STRING ||
 621                             f->flags & FIELD_IS_FLAG ||
 622                             f->flags & FIELD_IS_SYMBOLIC)
 623                                 fprintf(ofp, "%%s");
 624                         else if (f->flags & FIELD_IS_SIGNED)
 625                                 fprintf(ofp, "%%d");
 626                         else
 627                                 fprintf(ofp, "%%u");
 628                 }
 629
 630                 fprintf(ofp, "\\n\" %% \\\n\t\t(");
 631
 632                 not_first = 0;
 633                 count = 0;
 634
 635                 for (f = event->format.fields; f; f = f->next) {
 636                         if (not_first++)
 637                                 fprintf(ofp, ", ");
 638
 639                         if (++count % 5 == 0)
 640                                 fprintf(ofp, "\n\t\t");
 641
 642                         if (f->flags & FIELD_IS_FLAG) {
 643                                 if ((count - 1) % 5 != 0) {
 644                                         fprintf(ofp, "\n\t\t");
 645                                         count = 4;
 646                                 }
 647                                 fprintf(ofp, "flag_str(\"");
 648                                 fprintf(ofp, "%s__%s\", ", event->system,
 649                                         event->name);
 650                                 fprintf(ofp, "\"%s\", %s)", f->name,
 651                                         f->name);
 652                         } else if (f->flags & FIELD_IS_SYMBOLIC) {
 653                                 if ((count - 1) % 5 != 0) {
 654                                         fprintf(ofp, "\n\t\t");
 655                                         count = 4;
 656                                 }
 657                                 fprintf(ofp, "symbol_str(\"");
 658                                 fprintf(ofp, "%s__%s\", ", event->system,
 659                                         event->name);
 660                                 fprintf(ofp, "\"%s\", %s)", f->name,
 661                                         f->name);
 662                         } else
 663                                 fprintf(ofp, "%s", f->name);
 664                 }
 665
 666                 fprintf(ofp, "),\n\n");
 667         }
 668
 669         fprintf(ofp, "def trace_unhandled(event_name, context, "
 670                 "event_fields_dict):\n");
 671
 672         fprintf(ofp, "\t\tprint ' '.join(['%%s=%%s'%%(k,str(v))"
 673                 "for k,v in sorted(event_fields_dict.items())])\n\n");
 674
 675         fprintf(ofp, "def print_header("
 676                 "event_name, cpu, secs, nsecs, pid, comm):\n"
 677                 "\tprint \"%%-20s %%5u %%05u.%%09u %%8u %%-20s \" %% \\\n\t"
 678                 "(event_name, cpu, secs, nsecs, pid, comm),\n");
 679
 680         fclose(ofp);
 681
 682         fprintf(stderr, "generated Python script: %s\n", fname);
 683
 684         return 0;
 685 }
 686
 687 struct scripting_ops python_scripting_ops = {
 688         .name = "Python",
 689         .start_script = python_start_script,
 690         .stop_script = python_stop_script,
 691         .process_event = python_process_event,
 692         .generate_script = python_generate_script,
 693 };