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 /*
  60  * Insert val into into the dictionary and decrement the reference counter.
  61  * This is necessary for dictionaries since PyDict_SetItemString() does not
  62  * steal a reference, as opposed to PyTuple_SetItem().
  63  */
  64 static void pydict_set_item_string_decref(PyObject *dict, const char *key, PyObject *val)
  65 {
  66         PyDict_SetItemString(dict, key, val);
  67         Py_DECREF(val);
  68 }
  69
  70 static void define_value(enum print_arg_type field_type,
  71                          const char *ev_name,
  72                          const char *field_name,
  73                          const char *field_value,
  74                          const char *field_str)
  75 {
  76         const char *handler_name = "define_flag_value";
  77         PyObject *handler, *t, *retval;
  78         unsigned long long value;
  79         unsigned n = 0;
  80
  81         if (field_type == PRINT_SYMBOL)
  82                 handler_name = "define_symbolic_value";
  83
  84         t = PyTuple_New(4);
  85         if (!t)
  86                 Py_FatalError("couldn't create Python tuple");
  87
  88         value = eval_flag(field_value);
  89
  90         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
  91         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
  92         PyTuple_SetItem(t, n++, PyInt_FromLong(value));
  93         PyTuple_SetItem(t, n++, PyString_FromString(field_str));
  94
  95         handler = PyDict_GetItemString(main_dict, handler_name);
  96         if (handler && PyCallable_Check(handler)) {
  97                 retval = PyObject_CallObject(handler, t);
  98                 if (retval == NULL)
  99                         handler_call_die(handler_name);
 100         }
 101
 102         Py_DECREF(t);
 103 }
 104
 105 static void define_values(enum print_arg_type field_type,
 106                           struct print_flag_sym *field,
 107                           const char *ev_name,
 108                           const char *field_name)
 109 {
 110         define_value(field_type, ev_name, field_name, field->value,
 111                      field->str);
 112
 113         if (field->next)
 114                 define_values(field_type, field->next, ev_name, field_name);
 115 }
 116
 117 static void define_field(enum print_arg_type field_type,
 118                          const char *ev_name,
 119                          const char *field_name,
 120                          const char *delim)
 121 {
 122         const char *handler_name = "define_flag_field";
 123         PyObject *handler, *t, *retval;
 124         unsigned n = 0;
 125
 126         if (field_type == PRINT_SYMBOL)
 127                 handler_name = "define_symbolic_field";
 128
 129         if (field_type == PRINT_FLAGS)
 130                 t = PyTuple_New(3);
 131         else
 132                 t = PyTuple_New(2);
 133         if (!t)
 134                 Py_FatalError("couldn't create Python tuple");
 135
 136         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
 137         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
 138         if (field_type == PRINT_FLAGS)
 139                 PyTuple_SetItem(t, n++, PyString_FromString(delim));
 140
 141         handler = PyDict_GetItemString(main_dict, handler_name);
 142         if (handler && PyCallable_Check(handler)) {
 143                 retval = PyObject_CallObject(handler, t);
 144                 if (retval == NULL)
 145                         handler_call_die(handler_name);
 146         }
 147
 148         Py_DECREF(t);
 149 }
 150
 151 static void define_event_symbols(struct event_format *event,
 152                                  const char *ev_name,
 153                                  struct print_arg *args)
 154 {
 155         switch (args->type) {
 156         case PRINT_NULL:
 157                 break;
 158         case PRINT_ATOM:
 159                 define_value(PRINT_FLAGS, ev_name, cur_field_name, "0",
 160                              args->atom.atom);
 161                 zero_flag_atom = 0;
 162                 break;
 163         case PRINT_FIELD:
 164                 free(cur_field_name);
 165                 cur_field_name = strdup(args->field.name);
 166                 break;
 167         case PRINT_FLAGS:
 168                 define_event_symbols(event, ev_name, args->flags.field);
 169                 define_field(PRINT_FLAGS, ev_name, cur_field_name,
 170                              args->flags.delim);
 171                 define_values(PRINT_FLAGS, args->flags.flags, ev_name,
 172                               cur_field_name);
 173                 break;
 174         case PRINT_SYMBOL:
 175                 define_event_symbols(event, ev_name, args->symbol.field);
 176                 define_field(PRINT_SYMBOL, ev_name, cur_field_name, NULL);
 177                 define_values(PRINT_SYMBOL, args->symbol.symbols, ev_name,
 178                               cur_field_name);
 179                 break;
 180         case PRINT_HEX:
 181                 define_event_symbols(event, ev_name, args->hex.field);
 182                 define_event_symbols(event, ev_name, args->hex.size);
 183                 break;
 184         case PRINT_STRING:
 185                 break;
 186         case PRINT_TYPE:
 187                 define_event_symbols(event, ev_name, args->typecast.item);
 188                 break;
 189         case PRINT_OP:
 190                 if (strcmp(args->op.op, ":") == 0)
 191                         zero_flag_atom = 1;
 192                 define_event_symbols(event, ev_name, args->op.left);
 193                 define_event_symbols(event, ev_name, args->op.right);
 194                 break;
 195         default:
 196                 /* gcc warns for these? */
 197         case PRINT_BSTRING:
 198         case PRINT_DYNAMIC_ARRAY:
 199         case PRINT_FUNC:
 200         case PRINT_BITMASK:
 201                 /* we should warn... */
 202                 return;
 203         }
 204
 205         if (args->next)
 206                 define_event_symbols(event, ev_name, args->next);
 207 }
 208
 209 static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 210 {
 211         static char ev_name[256];
 212         struct event_format *event;
 213         int type = evsel->attr.config;
 214
 215         /*
 216          * XXX: Do we really need to cache this since now we have evsel->tp_format
 217          * cached already? Need to re-read this "cache" routine that as well calls
 218          * define_event_symbols() :-\
 219          */
 220         if (events[type])
 221                 return events[type];
 222
 223         events[type] = event = evsel->tp_format;
 224         if (!event)
 225                 return NULL;
 226
 227         sprintf(ev_name, "%s__%s", event->system, event->name);
 228
 229         define_event_symbols(event, ev_name, event->print_fmt.args);
 230
 231         return event;
 232 }
 233
 234 static void python_process_tracepoint(struct perf_sample *sample,
 235                                       struct perf_evsel *evsel,
 236                                       struct thread *thread,
 237                                       struct addr_location *al)
 238 {
 239         PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;
 240         static char handler_name[256];
 241         struct format_field *field;
 242         unsigned long long val;
 243         unsigned long s, ns;
 244         struct event_format *event;
 245         unsigned n = 0;
 246         int pid;
 247         int cpu = sample->cpu;
 248         void *data = sample->raw_data;
 249         unsigned long long nsecs = sample->time;
 250         const char *comm = thread__comm_str(thread);
 251
 252         t = PyTuple_New(MAX_FIELDS);
 253         if (!t)
 254                 Py_FatalError("couldn't create Python tuple");
 255
 256         event = find_cache_event(evsel);
 257         if (!event)
 258                 die("ug! no event found for type %d", (int)evsel->attr.config);
 259
 260         pid = raw_field_value(event, "common_pid", data);
 261
 262         sprintf(handler_name, "%s__%s", event->system, event->name);
 263
 264         handler = PyDict_GetItemString(main_dict, handler_name);
 265         if (handler && !PyCallable_Check(handler))
 266                 handler = NULL;
 267         if (!handler) {
 268                 dict = PyDict_New();
 269                 if (!dict)
 270                         Py_FatalError("couldn't create Python dict");
 271         }
 272         s = nsecs / NSECS_PER_SEC;
 273         ns = nsecs - s * NSECS_PER_SEC;
 274
 275         scripting_context->event_data = data;
 276         scripting_context->pevent = evsel->tp_format->pevent;
 277
 278         context = PyCObject_FromVoidPtr(scripting_context, NULL);
 279
 280         PyTuple_SetItem(t, n++, PyString_FromString(handler_name));
 281         PyTuple_SetItem(t, n++, context);
 282
 283         if (handler) {
 284                 PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
 285                 PyTuple_SetItem(t, n++, PyInt_FromLong(s));
 286                 PyTuple_SetItem(t, n++, PyInt_FromLong(ns));
 287                 PyTuple_SetItem(t, n++, PyInt_FromLong(pid));
 288                 PyTuple_SetItem(t, n++, PyString_FromString(comm));
 289         } else {
 290                 pydict_set_item_string_decref(dict, "common_cpu", PyInt_FromLong(cpu));
 291                 pydict_set_item_string_decref(dict, "common_s", PyInt_FromLong(s));
 292                 pydict_set_item_string_decref(dict, "common_ns", PyInt_FromLong(ns));
 293                 pydict_set_item_string_decref(dict, "common_pid", PyInt_FromLong(pid));
 294                 pydict_set_item_string_decref(dict, "common_comm", PyString_FromString(comm));
 295         }
 296         for (field = event->format.fields; field; field = field->next) {
 297                 if (field->flags & FIELD_IS_STRING) {
 298                         int offset;
 299                         if (field->flags & FIELD_IS_DYNAMIC) {
 300                                 offset = *(int *)(data + field->offset);
 301                                 offset &= 0xffff;
 302                         } else
 303                                 offset = field->offset;
 304                         obj = PyString_FromString((char *)data + offset);
 305                 } else { /* FIELD_IS_NUMERIC */
 306                         val = read_size(event, data + field->offset,
 307                                         field->size);
 308                         if (field->flags & FIELD_IS_SIGNED) {
 309                                 if ((long long)val >= LONG_MIN &&
 310                                     (long long)val <= LONG_MAX)
 311                                         obj = PyInt_FromLong(val);
 312                                 else
 313                                         obj = PyLong_FromLongLong(val);
 314                         } else {
 315                                 if (val <= LONG_MAX)
 316                                         obj = PyInt_FromLong(val);
 317                                 else
 318                                         obj = PyLong_FromUnsignedLongLong(val);
 319                         }
 320                 }
 321                 if (handler)
 322                         PyTuple_SetItem(t, n++, obj);
 323                 else
 324                         pydict_set_item_string_decref(dict, field->name, obj);
 325
 326         }
 327         if (!handler)
 328                 PyTuple_SetItem(t, n++, dict);
 329
 330         if (_PyTuple_Resize(&t, n) == -1)
 331                 Py_FatalError("error resizing Python tuple");
 332
 333         if (handler) {
 334                 retval = PyObject_CallObject(handler, t);
 335                 if (retval == NULL)
 336                         handler_call_die(handler_name);
 337         } else {
 338                 handler = PyDict_GetItemString(main_dict, "trace_unhandled");
 339                 if (handler && PyCallable_Check(handler)) {
 340
 341                         retval = PyObject_CallObject(handler, t);
 342                         if (retval == NULL)
 343                                 handler_call_die("trace_unhandled");
 344                 }
 345                 Py_DECREF(dict);
 346         }
 347
 348         Py_DECREF(t);
 349 }
 350
 351 static void python_process_general_event(struct perf_sample *sample,
 352                                          struct perf_evsel *evsel,
 353                                          struct thread *thread,
 354                                          struct addr_location *al)
 355 {
 356         PyObject *handler, *retval, *t, *dict;
 357         static char handler_name[64];
 358         unsigned n = 0;
 359
 360         /*
 361          * Use the MAX_FIELDS to make the function expandable, though
 362          * currently there is only one item for the tuple.
 363          */
 364         t = PyTuple_New(MAX_FIELDS);
 365         if (!t)
 366                 Py_FatalError("couldn't create Python tuple");
 367
 368         dict = PyDict_New();
 369         if (!dict)
 370                 Py_FatalError("couldn't create Python dictionary");
 371
 372         snprintf(handler_name, sizeof(handler_name), "%s", "process_event");
 373
 374         handler = PyDict_GetItemString(main_dict, handler_name);
 375         if (!handler || !PyCallable_Check(handler))
 376                 goto exit;
 377
 378         pydict_set_item_string_decref(dict, "ev_name", PyString_FromString(perf_evsel__name(evsel)));
 379         pydict_set_item_string_decref(dict, "attr", PyString_FromStringAndSize(
 380                         (const char *)&evsel->attr, sizeof(evsel->attr)));
 381         pydict_set_item_string_decref(dict, "sample", PyString_FromStringAndSize(
 382                         (const char *)sample, sizeof(*sample)));
 383         pydict_set_item_string_decref(dict, "raw_buf", PyString_FromStringAndSize(
 384                         (const char *)sample->raw_data, sample->raw_size));
 385         pydict_set_item_string_decref(dict, "comm",
 386                         PyString_FromString(thread__comm_str(thread)));
 387         if (al->map) {
 388                 pydict_set_item_string_decref(dict, "dso",
 389                         PyString_FromString(al->map->dso->name));
 390         }
 391         if (al->sym) {
 392                 pydict_set_item_string_decref(dict, "symbol",
 393                         PyString_FromString(al->sym->name));
 394         }
 395
 396         PyTuple_SetItem(t, n++, dict);
 397         if (_PyTuple_Resize(&t, n) == -1)
 398                 Py_FatalError("error resizing Python tuple");
 399
 400         retval = PyObject_CallObject(handler, t);
 401         if (retval == NULL)
 402                 handler_call_die(handler_name);
 403 exit:
 404         Py_DECREF(dict);
 405         Py_DECREF(t);
 406 }
 407
 408 static void python_process_event(union perf_event *event __maybe_unused,
 409                                  struct perf_sample *sample,
 410                                  struct perf_evsel *evsel,
 411                                  struct thread *thread,
 412                                  struct addr_location *al)
 413 {
 414         switch (evsel->attr.type) {
 415         case PERF_TYPE_TRACEPOINT:
 416                 python_process_tracepoint(sample, evsel, thread, al);
 417                 break;
 418         /* Reserve for future process_hw/sw/raw APIs */
 419         default:
 420                 python_process_general_event(sample, evsel, thread, al);
 421         }
 422 }
 423
 424 static int run_start_sub(void)
 425 {
 426         PyObject *handler, *retval;
 427         int err = 0;
 428
 429         main_module = PyImport_AddModule("__main__");
 430         if (main_module == NULL)
 431                 return -1;
 432         Py_INCREF(main_module);
 433
 434         main_dict = PyModule_GetDict(main_module);
 435         if (main_dict == NULL) {
 436                 err = -1;
 437                 goto error;
 438         }
 439         Py_INCREF(main_dict);
 440
 441         handler = PyDict_GetItemString(main_dict, "trace_begin");
 442         if (handler == NULL || !PyCallable_Check(handler))
 443                 goto out;
 444
 445         retval = PyObject_CallObject(handler, NULL);
 446         if (retval == NULL)
 447                 handler_call_die("trace_begin");
 448
 449         Py_DECREF(retval);
 450         return err;
 451 error:
 452         Py_XDECREF(main_dict);
 453         Py_XDECREF(main_module);
 454 out:
 455         return err;
 456 }
 457
 458 /*
 459  * Start trace script
 460  */
 461 static int python_start_script(const char *script, int argc, const char **argv)
 462 {
 463         const char **command_line;
 464         char buf[PATH_MAX];
 465         int i, err = 0;
 466         FILE *fp;
 467
 468         command_line = malloc((argc + 1) * sizeof(const char *));
 469         command_line[0] = script;
 470         for (i = 1; i < argc + 1; i++)
 471                 command_line[i] = argv[i - 1];
 472
 473         Py_Initialize();
 474
 475         initperf_trace_context();
 476
 477         PySys_SetArgv(argc + 1, (char **)command_line);
 478
 479         fp = fopen(script, "r");
 480         if (!fp) {
 481                 sprintf(buf, "Can't open python script \"%s\"", script);
 482                 perror(buf);
 483                 err = -1;
 484                 goto error;
 485         }
 486
 487         err = PyRun_SimpleFile(fp, script);
 488         if (err) {
 489                 fprintf(stderr, "Error running python script %s\n", script);
 490                 goto error;
 491         }
 492
 493         err = run_start_sub();
 494         if (err) {
 495                 fprintf(stderr, "Error starting python script %s\n", script);
 496                 goto error;
 497         }
 498
 499         free(command_line);
 500
 501         return err;
 502 error:
 503         Py_Finalize();
 504         free(command_line);
 505
 506         return err;
 507 }
 508
 509 /*
 510  * Stop trace script
 511  */
 512 static int python_stop_script(void)
 513 {
 514         PyObject *handler, *retval;
 515         int err = 0;
 516
 517         handler = PyDict_GetItemString(main_dict, "trace_end");
 518         if (handler == NULL || !PyCallable_Check(handler))
 519                 goto out;
 520
 521         retval = PyObject_CallObject(handler, NULL);
 522         if (retval == NULL)
 523                 handler_call_die("trace_end");
 524         else
 525                 Py_DECREF(retval);
 526 out:
 527         Py_XDECREF(main_dict);
 528         Py_XDECREF(main_module);
 529         Py_Finalize();
 530
 531         return err;
 532 }
 533
 534 static int python_generate_script(struct pevent *pevent, const char *outfile)
 535 {
 536         struct event_format *event = NULL;
 537         struct format_field *f;
 538         char fname[PATH_MAX];
 539         int not_first, count;
 540         FILE *ofp;
 541
 542         sprintf(fname, "%s.py", outfile);
 543         ofp = fopen(fname, "w");
 544         if (ofp == NULL) {
 545                 fprintf(stderr, "couldn't open %s\n", fname);
 546                 return -1;
 547         }
 548         fprintf(ofp, "# perf script event handlers, "
 549                 "generated by perf script -g python\n");
 550
 551         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 552                 " License version 2\n\n");
 553
 554         fprintf(ofp, "# The common_* event handler fields are the most useful "
 555                 "fields common to\n");
 556
 557         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 558                 "the 'common_*' fields\n");
 559
 560         fprintf(ofp, "# in the format files.  Those fields not available as "
 561                 "handler params can\n");
 562
 563         fprintf(ofp, "# be retrieved using Python functions of the form "
 564                 "common_*(context).\n");
 565
 566         fprintf(ofp, "# See the perf-trace-python Documentation for the list "
 567                 "of available functions.\n\n");
 568
 569         fprintf(ofp, "import os\n");
 570         fprintf(ofp, "import sys\n\n");
 571
 572         fprintf(ofp, "sys.path.append(os.environ['PERF_EXEC_PATH'] + \\\n");
 573         fprintf(ofp, "\t'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')\n");
 574         fprintf(ofp, "\nfrom perf_trace_context import *\n");
 575         fprintf(ofp, "from Core import *\n\n\n");
 576
 577         fprintf(ofp, "def trace_begin():\n");
 578         fprintf(ofp, "\tprint \"in trace_begin\"\n\n");
 579
 580         fprintf(ofp, "def trace_end():\n");
 581         fprintf(ofp, "\tprint \"in trace_end\"\n\n");
 582
 583         while ((event = trace_find_next_event(pevent, event))) {
 584                 fprintf(ofp, "def %s__%s(", event->system, event->name);
 585                 fprintf(ofp, "event_name, ");
 586                 fprintf(ofp, "context, ");
 587                 fprintf(ofp, "common_cpu,\n");
 588                 fprintf(ofp, "\tcommon_secs, ");
 589                 fprintf(ofp, "common_nsecs, ");
 590                 fprintf(ofp, "common_pid, ");
 591                 fprintf(ofp, "common_comm,\n\t");
 592
 593                 not_first = 0;
 594                 count = 0;
 595
 596                 for (f = event->format.fields; f; f = f->next) {
 597                         if (not_first++)
 598                                 fprintf(ofp, ", ");
 599                         if (++count % 5 == 0)
 600                                 fprintf(ofp, "\n\t");
 601
 602                         fprintf(ofp, "%s", f->name);
 603                 }
 604                 fprintf(ofp, "):\n");
 605
 606                 fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
 607                         "common_secs, common_nsecs,\n\t\t\t"
 608                         "common_pid, common_comm)\n\n");
 609
 610                 fprintf(ofp, "\t\tprint \"");
 611
 612                 not_first = 0;
 613                 count = 0;
 614
 615                 for (f = event->format.fields; f; f = f->next) {
 616                         if (not_first++)
 617                                 fprintf(ofp, ", ");
 618                         if (count && count % 3 == 0) {
 619                                 fprintf(ofp, "\" \\\n\t\t\"");
 620                         }
 621                         count++;
 622
 623                         fprintf(ofp, "%s=", f->name);
 624                         if (f->flags & FIELD_IS_STRING ||
 625                             f->flags & FIELD_IS_FLAG ||
 626                             f->flags & FIELD_IS_ARRAY ||
 627                             f->flags & FIELD_IS_SYMBOLIC)
 628                                 fprintf(ofp, "%%s");
 629                         else if (f->flags & FIELD_IS_SIGNED)
 630                                 fprintf(ofp, "%%d");
 631                         else
 632                                 fprintf(ofp, "%%u");
 633                 }
 634
 635                 fprintf(ofp, "\\n\" %% \\\n\t\t(");
 636
 637                 not_first = 0;
 638                 count = 0;
 639
 640                 for (f = event->format.fields; f; f = f->next) {
 641                         if (not_first++)
 642                                 fprintf(ofp, ", ");
 643
 644                         if (++count % 5 == 0)
 645                                 fprintf(ofp, "\n\t\t");
 646
 647                         if (f->flags & FIELD_IS_FLAG) {
 648                                 if ((count - 1) % 5 != 0) {
 649                                         fprintf(ofp, "\n\t\t");
 650                                         count = 4;
 651                                 }
 652                                 fprintf(ofp, "flag_str(\"");
 653                                 fprintf(ofp, "%s__%s\", ", event->system,
 654                                         event->name);
 655                                 fprintf(ofp, "\"%s\", %s)", f->name,
 656                                         f->name);
 657                         } else if (f->flags & FIELD_IS_SYMBOLIC) {
 658                                 if ((count - 1) % 5 != 0) {
 659                                         fprintf(ofp, "\n\t\t");
 660                                         count = 4;
 661                                 }
 662                                 fprintf(ofp, "symbol_str(\"");
 663                                 fprintf(ofp, "%s__%s\", ", event->system,
 664                                         event->name);
 665                                 fprintf(ofp, "\"%s\", %s)", f->name,
 666                                         f->name);
 667                         } else
 668                                 fprintf(ofp, "%s", f->name);
 669                 }
 670
 671                 fprintf(ofp, "),\n\n");
 672         }
 673
 674         fprintf(ofp, "def trace_unhandled(event_name, context, "
 675                 "event_fields_dict):\n");
 676
 677         fprintf(ofp, "\t\tprint ' '.join(['%%s=%%s'%%(k,str(v))"
 678                 "for k,v in sorted(event_fields_dict.items())])\n\n");
 679
 680         fprintf(ofp, "def print_header("
 681                 "event_name, cpu, secs, nsecs, pid, comm):\n"
 682                 "\tprint \"%%-20s %%5u %%05u.%%09u %%8u %%-20s \" %% \\\n\t"
 683                 "(event_name, cpu, secs, nsecs, pid, comm),\n");
 684
 685         fclose(ofp);
 686
 687         fprintf(stderr, "generated Python script: %s\n", fname);
 688
 689         return 0;
 690 }
 691
 692 struct scripting_ops python_scripting_ops = {
 693         .name = "Python",
 694         .start_script = python_start_script,
 695         .stop_script = python_stop_script,
 696         .process_event = python_process_event,
 697         .generate_script = python_generate_script,
 698 };