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                 if (cur_field_name)
 165                         free(cur_field_name);
 166                 cur_field_name = strdup(args->field.name);
 167                 break;
 168         case PRINT_FLAGS:
 169                 define_event_symbols(event, ev_name, args->flags.field);
 170                 define_field(PRINT_FLAGS, ev_name, cur_field_name,
 171                              args->flags.delim);
 172                 define_values(PRINT_FLAGS, args->flags.flags, ev_name,
 173                               cur_field_name);
 174                 break;
 175         case PRINT_SYMBOL:
 176                 define_event_symbols(event, ev_name, args->symbol.field);
 177                 define_field(PRINT_SYMBOL, ev_name, cur_field_name, NULL);
 178                 define_values(PRINT_SYMBOL, args->symbol.symbols, ev_name,
 179                               cur_field_name);
 180                 break;
 181         case PRINT_HEX:
 182                 define_event_symbols(event, ev_name, args->hex.field);
 183                 define_event_symbols(event, ev_name, args->hex.size);
 184                 break;
 185         case PRINT_STRING:
 186                 break;
 187         case PRINT_TYPE:
 188                 define_event_symbols(event, ev_name, args->typecast.item);
 189                 break;
 190         case PRINT_OP:
 191                 if (strcmp(args->op.op, ":") == 0)
 192                         zero_flag_atom = 1;
 193                 define_event_symbols(event, ev_name, args->op.left);
 194                 define_event_symbols(event, ev_name, args->op.right);
 195                 break;
 196         default:
 197                 /* gcc warns for these? */
 198         case PRINT_BSTRING:
 199         case PRINT_DYNAMIC_ARRAY:
 200         case PRINT_FUNC:
 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(union perf_event *perf_event
 235                                       __maybe_unused,
 236                                  struct perf_sample *sample,
 237                                  struct perf_evsel *evsel,
 238                                  struct machine *machine __maybe_unused,
 239                                  struct thread *thread,
 240                                  struct addr_location *al)
 241 {
 242         PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;
 243         static char handler_name[256];
 244         struct format_field *field;
 245         unsigned long long val;
 246         unsigned long s, ns;
 247         struct event_format *event;
 248         unsigned n = 0;
 249         int pid;
 250         int cpu = sample->cpu;
 251         void *data = sample->raw_data;
 252         unsigned long long nsecs = sample->time;
 253         char *comm = thread->comm;
 254
 255         t = PyTuple_New(MAX_FIELDS);
 256         if (!t)
 257                 Py_FatalError("couldn't create Python tuple");
 258
 259         event = find_cache_event(evsel);
 260         if (!event)
 261                 die("ug! no event found for type %d", (int)evsel->attr.config);
 262
 263         pid = raw_field_value(event, "common_pid", data);
 264
 265         sprintf(handler_name, "%s__%s", event->system, event->name);
 266
 267         handler = PyDict_GetItemString(main_dict, handler_name);
 268         if (handler && !PyCallable_Check(handler))
 269                 handler = NULL;
 270         if (!handler) {
 271                 dict = PyDict_New();
 272                 if (!dict)
 273                         Py_FatalError("couldn't create Python dict");
 274         }
 275         s = nsecs / NSECS_PER_SEC;
 276         ns = nsecs - s * NSECS_PER_SEC;
 277
 278         scripting_context->event_data = data;
 279         scripting_context->pevent = evsel->tp_format->pevent;
 280
 281         context = PyCObject_FromVoidPtr(scripting_context, NULL);
 282
 283         PyTuple_SetItem(t, n++, PyString_FromString(handler_name));
 284         PyTuple_SetItem(t, n++, context);
 285
 286         if (handler) {
 287                 PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
 288                 PyTuple_SetItem(t, n++, PyInt_FromLong(s));
 289                 PyTuple_SetItem(t, n++, PyInt_FromLong(ns));
 290                 PyTuple_SetItem(t, n++, PyInt_FromLong(pid));
 291                 PyTuple_SetItem(t, n++, PyString_FromString(comm));
 292         } else {
 293                 pydict_set_item_string_decref(dict, "common_cpu", PyInt_FromLong(cpu));
 294                 pydict_set_item_string_decref(dict, "common_s", PyInt_FromLong(s));
 295                 pydict_set_item_string_decref(dict, "common_ns", PyInt_FromLong(ns));
 296                 pydict_set_item_string_decref(dict, "common_pid", PyInt_FromLong(pid));
 297                 pydict_set_item_string_decref(dict, "common_comm", PyString_FromString(comm));
 298         }
 299         for (field = event->format.fields; field; field = field->next) {
 300                 if (field->flags & FIELD_IS_STRING) {
 301                         int offset;
 302                         if (field->flags & FIELD_IS_DYNAMIC) {
 303                                 offset = *(int *)(data + field->offset);
 304                                 offset &= 0xffff;
 305                         } else
 306                                 offset = field->offset;
 307                         obj = PyString_FromString((char *)data + offset);
 308                 } else { /* FIELD_IS_NUMERIC */
 309                         val = read_size(event, data + field->offset,
 310                                         field->size);
 311                         if (field->flags & FIELD_IS_SIGNED) {
 312                                 if ((long long)val >= LONG_MIN &&
 313                                     (long long)val <= LONG_MAX)
 314                                         obj = PyInt_FromLong(val);
 315                                 else
 316                                         obj = PyLong_FromLongLong(val);
 317                         } else {
 318                                 if (val <= LONG_MAX)
 319                                         obj = PyInt_FromLong(val);
 320                                 else
 321                                         obj = PyLong_FromUnsignedLongLong(val);
 322                         }
 323                 }
 324                 if (handler)
 325                         PyTuple_SetItem(t, n++, obj);
 326                 else
 327                         pydict_set_item_string_decref(dict, field->name, obj);
 328
 329         }
 330         if (!handler)
 331                 PyTuple_SetItem(t, n++, dict);
 332
 333         if (_PyTuple_Resize(&t, n) == -1)
 334                 Py_FatalError("error resizing Python tuple");
 335
 336         if (handler) {
 337                 retval = PyObject_CallObject(handler, t);
 338                 if (retval == NULL)
 339                         handler_call_die(handler_name);
 340         } else {
 341                 handler = PyDict_GetItemString(main_dict, "trace_unhandled");
 342                 if (handler && PyCallable_Check(handler)) {
 343
 344                         retval = PyObject_CallObject(handler, t);
 345                         if (retval == NULL)
 346                                 handler_call_die("trace_unhandled");
 347                 }
 348                 Py_DECREF(dict);
 349         }
 350
 351         Py_DECREF(t);
 352 }
 353
 354 static void python_process_general_event(union perf_event *perf_event
 355                                          __maybe_unused,
 356                                          struct perf_sample *sample,
 357                                          struct perf_evsel *evsel,
 358                                          struct machine *machine __maybe_unused,
 359                                          struct thread *thread,
 360                                          struct addr_location *al)
 361 {
 362         PyObject *handler, *retval, *t, *dict;
 363         static char handler_name[64];
 364         unsigned n = 0;
 365
 366         /*
 367          * Use the MAX_FIELDS to make the function expandable, though
 368          * currently there is only one item for the tuple.
 369          */
 370         t = PyTuple_New(MAX_FIELDS);
 371         if (!t)
 372                 Py_FatalError("couldn't create Python tuple");
 373
 374         dict = PyDict_New();
 375         if (!dict)
 376                 Py_FatalError("couldn't create Python dictionary");
 377
 378         snprintf(handler_name, sizeof(handler_name), "%s", "process_event");
 379
 380         handler = PyDict_GetItemString(main_dict, handler_name);
 381         if (!handler || !PyCallable_Check(handler))
 382                 goto exit;
 383
 384         pydict_set_item_string_decref(dict, "ev_name", PyString_FromString(perf_evsel__name(evsel)));
 385         pydict_set_item_string_decref(dict, "attr", PyString_FromStringAndSize(
 386                         (const char *)&evsel->attr, sizeof(evsel->attr)));
 387         pydict_set_item_string_decref(dict, "sample", PyString_FromStringAndSize(
 388                         (const char *)sample, sizeof(*sample)));
 389         pydict_set_item_string_decref(dict, "raw_buf", PyString_FromStringAndSize(
 390                         (const char *)sample->raw_data, sample->raw_size));
 391         pydict_set_item_string_decref(dict, "comm",
 392                         PyString_FromString(thread->comm));
 393         if (al->map) {
 394                 pydict_set_item_string_decref(dict, "dso",
 395                         PyString_FromString(al->map->dso->name));
 396         }
 397         if (al->sym) {
 398                 pydict_set_item_string_decref(dict, "symbol",
 399                         PyString_FromString(al->sym->name));
 400         }
 401
 402         PyTuple_SetItem(t, n++, dict);
 403         if (_PyTuple_Resize(&t, n) == -1)
 404                 Py_FatalError("error resizing Python tuple");
 405
 406         retval = PyObject_CallObject(handler, t);
 407         if (retval == NULL)
 408                 handler_call_die(handler_name);
 409 exit:
 410         Py_DECREF(dict);
 411         Py_DECREF(t);
 412 }
 413
 414 static void python_process_event(union perf_event *perf_event,
 415                                  struct perf_sample *sample,
 416                                  struct perf_evsel *evsel,
 417                                  struct machine *machine,
 418                                  struct thread *thread,
 419                                  struct addr_location *al)
 420 {
 421         switch (evsel->attr.type) {
 422         case PERF_TYPE_TRACEPOINT:
 423                 python_process_tracepoint(perf_event, sample, evsel,
 424                                           machine, thread, al);
 425                 break;
 426         /* Reserve for future process_hw/sw/raw APIs */
 427         default:
 428                 python_process_general_event(perf_event, sample, evsel,
 429                                              machine, thread, al);
 430         }
 431 }
 432
 433 static int run_start_sub(void)
 434 {
 435         PyObject *handler, *retval;
 436         int err = 0;
 437
 438         main_module = PyImport_AddModule("__main__");
 439         if (main_module == NULL)
 440                 return -1;
 441         Py_INCREF(main_module);
 442
 443         main_dict = PyModule_GetDict(main_module);
 444         if (main_dict == NULL) {
 445                 err = -1;
 446                 goto error;
 447         }
 448         Py_INCREF(main_dict);
 449
 450         handler = PyDict_GetItemString(main_dict, "trace_begin");
 451         if (handler == NULL || !PyCallable_Check(handler))
 452                 goto out;
 453
 454         retval = PyObject_CallObject(handler, NULL);
 455         if (retval == NULL)
 456                 handler_call_die("trace_begin");
 457
 458         Py_DECREF(retval);
 459         return err;
 460 error:
 461         Py_XDECREF(main_dict);
 462         Py_XDECREF(main_module);
 463 out:
 464         return err;
 465 }
 466
 467 /*
 468  * Start trace script
 469  */
 470 static int python_start_script(const char *script, int argc, const char **argv)
 471 {
 472         const char **command_line;
 473         char buf[PATH_MAX];
 474         int i, err = 0;
 475         FILE *fp;
 476
 477         command_line = malloc((argc + 1) * sizeof(const char *));
 478         command_line[0] = script;
 479         for (i = 1; i < argc + 1; i++)
 480                 command_line[i] = argv[i - 1];
 481
 482         Py_Initialize();
 483
 484         initperf_trace_context();
 485
 486         PySys_SetArgv(argc + 1, (char **)command_line);
 487
 488         fp = fopen(script, "r");
 489         if (!fp) {
 490                 sprintf(buf, "Can't open python script \"%s\"", script);
 491                 perror(buf);
 492                 err = -1;
 493                 goto error;
 494         }
 495
 496         err = PyRun_SimpleFile(fp, script);
 497         if (err) {
 498                 fprintf(stderr, "Error running python script %s\n", script);
 499                 goto error;
 500         }
 501
 502         err = run_start_sub();
 503         if (err) {
 504                 fprintf(stderr, "Error starting python script %s\n", script);
 505                 goto error;
 506         }
 507
 508         free(command_line);
 509
 510         return err;
 511 error:
 512         Py_Finalize();
 513         free(command_line);
 514
 515         return err;
 516 }
 517
 518 /*
 519  * Stop trace script
 520  */
 521 static int python_stop_script(void)
 522 {
 523         PyObject *handler, *retval;
 524         int err = 0;
 525
 526         handler = PyDict_GetItemString(main_dict, "trace_end");
 527         if (handler == NULL || !PyCallable_Check(handler))
 528                 goto out;
 529
 530         retval = PyObject_CallObject(handler, NULL);
 531         if (retval == NULL)
 532                 handler_call_die("trace_end");
 533         else
 534                 Py_DECREF(retval);
 535 out:
 536         Py_XDECREF(main_dict);
 537         Py_XDECREF(main_module);
 538         Py_Finalize();
 539
 540         return err;
 541 }
 542
 543 static int python_generate_script(struct pevent *pevent, const char *outfile)
 544 {
 545         struct event_format *event = NULL;
 546         struct format_field *f;
 547         char fname[PATH_MAX];
 548         int not_first, count;
 549         FILE *ofp;
 550
 551         sprintf(fname, "%s.py", outfile);
 552         ofp = fopen(fname, "w");
 553         if (ofp == NULL) {
 554                 fprintf(stderr, "couldn't open %s\n", fname);
 555                 return -1;
 556         }
 557         fprintf(ofp, "# perf script event handlers, "
 558                 "generated by perf script -g python\n");
 559
 560         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 561                 " License version 2\n\n");
 562
 563         fprintf(ofp, "# The common_* event handler fields are the most useful "
 564                 "fields common to\n");
 565
 566         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 567                 "the 'common_*' fields\n");
 568
 569         fprintf(ofp, "# in the format files.  Those fields not available as "
 570                 "handler params can\n");
 571
 572         fprintf(ofp, "# be retrieved using Python functions of the form "
 573                 "common_*(context).\n");
 574
 575         fprintf(ofp, "# See the perf-trace-python Documentation for the list "
 576                 "of available functions.\n\n");
 577
 578         fprintf(ofp, "import os\n");
 579         fprintf(ofp, "import sys\n\n");
 580
 581         fprintf(ofp, "sys.path.append(os.environ['PERF_EXEC_PATH'] + \\\n");
 582         fprintf(ofp, "\t'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')\n");
 583         fprintf(ofp, "\nfrom perf_trace_context import *\n");
 584         fprintf(ofp, "from Core import *\n\n\n");
 585
 586         fprintf(ofp, "def trace_begin():\n");
 587         fprintf(ofp, "\tprint \"in trace_begin\"\n\n");
 588
 589         fprintf(ofp, "def trace_end():\n");
 590         fprintf(ofp, "\tprint \"in trace_end\"\n\n");
 591
 592         while ((event = trace_find_next_event(pevent, event))) {
 593                 fprintf(ofp, "def %s__%s(", event->system, event->name);
 594                 fprintf(ofp, "event_name, ");
 595                 fprintf(ofp, "context, ");
 596                 fprintf(ofp, "common_cpu,\n");
 597                 fprintf(ofp, "\tcommon_secs, ");
 598                 fprintf(ofp, "common_nsecs, ");
 599                 fprintf(ofp, "common_pid, ");
 600                 fprintf(ofp, "common_comm,\n\t");
 601
 602                 not_first = 0;
 603                 count = 0;
 604
 605                 for (f = event->format.fields; f; f = f->next) {
 606                         if (not_first++)
 607                                 fprintf(ofp, ", ");
 608                         if (++count % 5 == 0)
 609                                 fprintf(ofp, "\n\t");
 610
 611                         fprintf(ofp, "%s", f->name);
 612                 }
 613                 fprintf(ofp, "):\n");
 614
 615                 fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
 616                         "common_secs, common_nsecs,\n\t\t\t"
 617                         "common_pid, common_comm)\n\n");
 618
 619                 fprintf(ofp, "\t\tprint \"");
 620
 621                 not_first = 0;
 622                 count = 0;
 623
 624                 for (f = event->format.fields; f; f = f->next) {
 625                         if (not_first++)
 626                                 fprintf(ofp, ", ");
 627                         if (count && count % 3 == 0) {
 628                                 fprintf(ofp, "\" \\\n\t\t\"");
 629                         }
 630                         count++;
 631
 632                         fprintf(ofp, "%s=", f->name);
 633                         if (f->flags & FIELD_IS_STRING ||
 634                             f->flags & FIELD_IS_FLAG ||
 635                             f->flags & FIELD_IS_SYMBOLIC)
 636                                 fprintf(ofp, "%%s");
 637                         else if (f->flags & FIELD_IS_SIGNED)
 638                                 fprintf(ofp, "%%d");
 639                         else
 640                                 fprintf(ofp, "%%u");
 641                 }
 642
 643                 fprintf(ofp, "\\n\" %% \\\n\t\t(");
 644
 645                 not_first = 0;
 646                 count = 0;
 647
 648                 for (f = event->format.fields; f; f = f->next) {
 649                         if (not_first++)
 650                                 fprintf(ofp, ", ");
 651
 652                         if (++count % 5 == 0)
 653                                 fprintf(ofp, "\n\t\t");
 654
 655                         if (f->flags & FIELD_IS_FLAG) {
 656                                 if ((count - 1) % 5 != 0) {
 657                                         fprintf(ofp, "\n\t\t");
 658                                         count = 4;
 659                                 }
 660                                 fprintf(ofp, "flag_str(\"");
 661                                 fprintf(ofp, "%s__%s\", ", event->system,
 662                                         event->name);
 663                                 fprintf(ofp, "\"%s\", %s)", f->name,
 664                                         f->name);
 665                         } else if (f->flags & FIELD_IS_SYMBOLIC) {
 666                                 if ((count - 1) % 5 != 0) {
 667                                         fprintf(ofp, "\n\t\t");
 668                                         count = 4;
 669                                 }
 670                                 fprintf(ofp, "symbol_str(\"");
 671                                 fprintf(ofp, "%s__%s\", ", event->system,
 672                                         event->name);
 673                                 fprintf(ofp, "\"%s\", %s)", f->name,
 674                                         f->name);
 675                         } else
 676                                 fprintf(ofp, "%s", f->name);
 677                 }
 678
 679                 fprintf(ofp, "),\n\n");
 680         }
 681
 682         fprintf(ofp, "def trace_unhandled(event_name, context, "
 683                 "event_fields_dict):\n");
 684
 685         fprintf(ofp, "\t\tprint ' '.join(['%%s=%%s'%%(k,str(v))"
 686                 "for k,v in sorted(event_fields_dict.items())])\n\n");
 687
 688         fprintf(ofp, "def print_header("
 689                 "event_name, cpu, secs, nsecs, pid, comm):\n"
 690                 "\tprint \"%%-20s %%5u %%05u.%%09u %%8u %%-20s \" %% \\\n\t"
 691                 "(event_name, cpu, secs, nsecs, pid, comm),\n");
 692
 693         fclose(ofp);
 694
 695         fprintf(stderr, "generated Python script: %s\n", fname);
 696
 697         return 0;
 698 }
 699
 700 struct scripting_ops python_scripting_ops = {
 701         .name = "Python",
 702         .start_script = python_start_script,
 703         .stop_script = python_stop_script,
 704         .process_event = python_process_event,
 705         .generate_script = python_generate_script,
 706 };