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 <[email protected]>
   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 "../util.h"
  31 #include "../event.h"
  32 #include "../thread.h"
  33 #include "../trace-event.h"
  34
  35 PyMODINIT_FUNC initperf_trace_context(void);
  36
  37 #define FTRACE_MAX_EVENT                                \
  38         ((1 << (sizeof(unsigned short) * 8)) - 1)
  39
  40 struct event *events[FTRACE_MAX_EVENT];
  41
  42 #define MAX_FIELDS      64
  43 #define N_COMMON_FIELDS 7
  44
  45 extern struct scripting_context *scripting_context;
  46
  47 static char *cur_field_name;
  48 static int zero_flag_atom;
  49
  50 static PyObject *main_module, *main_dict;
  51
  52 static void handler_call_die(const char *handler_name)
  53 {
  54         PyErr_Print();
  55         Py_FatalError("problem in Python trace event handler");
  56 }
  57
  58 static void define_value(enum print_arg_type field_type,
  59                          const char *ev_name,
  60                          const char *field_name,
  61                          const char *field_value,
  62                          const char *field_str)
  63 {
  64         const char *handler_name = "define_flag_value";
  65         PyObject *handler, *t, *retval;
  66         unsigned long long value;
  67         unsigned n = 0;
  68
  69         if (field_type == PRINT_SYMBOL)
  70                 handler_name = "define_symbolic_value";
  71
  72         t = PyTuple_New(4);
  73         if (!t)
  74                 Py_FatalError("couldn't create Python tuple");
  75
  76         value = eval_flag(field_value);
  77
  78         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
  79         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
  80         PyTuple_SetItem(t, n++, PyInt_FromLong(value));
  81         PyTuple_SetItem(t, n++, PyString_FromString(field_str));
  82
  83         handler = PyDict_GetItemString(main_dict, handler_name);
  84         if (handler && PyCallable_Check(handler)) {
  85                 retval = PyObject_CallObject(handler, t);
  86                 if (retval == NULL)
  87                         handler_call_die(handler_name);
  88         }
  89
  90         Py_DECREF(t);
  91 }
  92
  93 static void define_values(enum print_arg_type field_type,
  94                           struct print_flag_sym *field,
  95                           const char *ev_name,
  96                           const char *field_name)
  97 {
  98         define_value(field_type, ev_name, field_name, field->value,
  99                      field->str);
 100
 101         if (field->next)
 102                 define_values(field_type, field->next, ev_name, field_name);
 103 }
 104
 105 static void define_field(enum print_arg_type field_type,
 106                          const char *ev_name,
 107                          const char *field_name,
 108                          const char *delim)
 109 {
 110         const char *handler_name = "define_flag_field";
 111         PyObject *handler, *t, *retval;
 112         unsigned n = 0;
 113
 114         if (field_type == PRINT_SYMBOL)
 115                 handler_name = "define_symbolic_field";
 116
 117         if (field_type == PRINT_FLAGS)
 118                 t = PyTuple_New(3);
 119         else
 120                 t = PyTuple_New(2);
 121         if (!t)
 122                 Py_FatalError("couldn't create Python tuple");
 123
 124         PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
 125         PyTuple_SetItem(t, n++, PyString_FromString(field_name));
 126         if (field_type == PRINT_FLAGS)
 127                 PyTuple_SetItem(t, n++, PyString_FromString(delim));
 128
 129         handler = PyDict_GetItemString(main_dict, handler_name);
 130         if (handler && PyCallable_Check(handler)) {
 131                 retval = PyObject_CallObject(handler, t);
 132                 if (retval == NULL)
 133                         handler_call_die(handler_name);
 134         }
 135
 136         Py_DECREF(t);
 137 }
 138
 139 static void define_event_symbols(struct event *event,
 140                                  const char *ev_name,
 141                                  struct print_arg *args)
 142 {
 143         switch (args->type) {
 144         case PRINT_NULL:
 145                 break;
 146         case PRINT_ATOM:
 147                 define_value(PRINT_FLAGS, ev_name, cur_field_name, "0",
 148                              args->atom.atom);
 149                 zero_flag_atom = 0;
 150                 break;
 151         case PRINT_FIELD:
 152                 if (cur_field_name)
 153                         free(cur_field_name);
 154                 cur_field_name = strdup(args->field.name);
 155                 break;
 156         case PRINT_FLAGS:
 157                 define_event_symbols(event, ev_name, args->flags.field);
 158                 define_field(PRINT_FLAGS, ev_name, cur_field_name,
 159                              args->flags.delim);
 160                 define_values(PRINT_FLAGS, args->flags.flags, ev_name,
 161                               cur_field_name);
 162                 break;
 163         case PRINT_SYMBOL:
 164                 define_event_symbols(event, ev_name, args->symbol.field);
 165                 define_field(PRINT_SYMBOL, ev_name, cur_field_name, NULL);
 166                 define_values(PRINT_SYMBOL, args->symbol.symbols, ev_name,
 167                               cur_field_name);
 168                 break;
 169         case PRINT_STRING:
 170                 break;
 171         case PRINT_TYPE:
 172                 define_event_symbols(event, ev_name, args->typecast.item);
 173                 break;
 174         case PRINT_OP:
 175                 if (strcmp(args->op.op, ":") == 0)
 176                         zero_flag_atom = 1;
 177                 define_event_symbols(event, ev_name, args->op.left);
 178                 define_event_symbols(event, ev_name, args->op.right);
 179                 break;
 180         default:
 181                 /* we should warn... */
 182                 return;
 183         }
 184
 185         if (args->next)
 186                 define_event_symbols(event, ev_name, args->next);
 187 }
 188
 189 static inline struct event *find_cache_event(int type)
 190 {
 191         static char ev_name[256];
 192         struct event *event;
 193
 194         if (events[type])
 195                 return events[type];
 196
 197         events[type] = event = trace_find_event(type);
 198         if (!event)
 199                 return NULL;
 200
 201         sprintf(ev_name, "%s__%s", event->system, event->name);
 202
 203         define_event_symbols(event, ev_name, event->print_fmt.args);
 204
 205         return event;
 206 }
 207
 208 static void python_process_event(union perf_event *pevent __unused,
 209                                  struct perf_sample *sample,
 210                                  struct perf_evsel *evsel __unused,
 211                                  struct machine *machine __unused,
 212                                  struct thread *thread)
 213 {
 214         PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;
 215         static char handler_name[256];
 216         struct format_field *field;
 217         unsigned long long val;
 218         unsigned long s, ns;
 219         struct event *event;
 220         unsigned n = 0;
 221         int type;
 222         int pid;
 223         int cpu = sample->cpu;
 224         void *data = sample->raw_data;
 225         unsigned long long nsecs = sample->time;
 226         char *comm = thread->comm;
 227
 228         t = PyTuple_New(MAX_FIELDS);
 229         if (!t)
 230                 Py_FatalError("couldn't create Python tuple");
 231
 232         type = trace_parse_common_type(data);
 233
 234         event = find_cache_event(type);
 235         if (!event)
 236                 die("ug! no event found for type %d", type);
 237
 238         pid = trace_parse_common_pid(data);
 239
 240         sprintf(handler_name, "%s__%s", event->system, event->name);
 241
 242         handler = PyDict_GetItemString(main_dict, handler_name);
 243         if (handler && !PyCallable_Check(handler))
 244                 handler = NULL;
 245         if (!handler) {
 246                 dict = PyDict_New();
 247                 if (!dict)
 248                         Py_FatalError("couldn't create Python dict");
 249         }
 250         s = nsecs / NSECS_PER_SEC;
 251         ns = nsecs - s * NSECS_PER_SEC;
 252
 253         scripting_context->event_data = data;
 254
 255         context = PyCObject_FromVoidPtr(scripting_context, NULL);
 256
 257         PyTuple_SetItem(t, n++, PyString_FromString(handler_name));
 258         PyTuple_SetItem(t, n++, context);
 259
 260         if (handler) {
 261                 PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
 262                 PyTuple_SetItem(t, n++, PyInt_FromLong(s));
 263                 PyTuple_SetItem(t, n++, PyInt_FromLong(ns));
 264                 PyTuple_SetItem(t, n++, PyInt_FromLong(pid));
 265                 PyTuple_SetItem(t, n++, PyString_FromString(comm));
 266         } else {
 267                 PyDict_SetItemString(dict, "common_cpu", PyInt_FromLong(cpu));
 268                 PyDict_SetItemString(dict, "common_s", PyInt_FromLong(s));
 269                 PyDict_SetItemString(dict, "common_ns", PyInt_FromLong(ns));
 270                 PyDict_SetItemString(dict, "common_pid", PyInt_FromLong(pid));
 271                 PyDict_SetItemString(dict, "common_comm", PyString_FromString(comm));
 272         }
 273         for (field = event->format.fields; field; field = field->next) {
 274                 if (field->flags & FIELD_IS_STRING) {
 275                         int offset;
 276                         if (field->flags & FIELD_IS_DYNAMIC) {
 277                                 offset = *(int *)(data + field->offset);
 278                                 offset &= 0xffff;
 279                         } else
 280                                 offset = field->offset;
 281                         obj = PyString_FromString((char *)data + offset);
 282                 } else { /* FIELD_IS_NUMERIC */
 283                         val = read_size(data + field->offset, field->size);
 284                         if (field->flags & FIELD_IS_SIGNED) {
 285                                 if ((long long)val >= LONG_MIN &&
 286                                     (long long)val <= LONG_MAX)
 287                                         obj = PyInt_FromLong(val);
 288                                 else
 289                                         obj = PyLong_FromLongLong(val);
 290                         } else {
 291                                 if (val <= LONG_MAX)
 292                                         obj = PyInt_FromLong(val);
 293                                 else
 294                                         obj = PyLong_FromUnsignedLongLong(val);
 295                         }
 296                 }
 297                 if (handler)
 298                         PyTuple_SetItem(t, n++, obj);
 299                 else
 300                         PyDict_SetItemString(dict, field->name, obj);
 301
 302         }
 303         if (!handler)
 304                 PyTuple_SetItem(t, n++, dict);
 305
 306         if (_PyTuple_Resize(&t, n) == -1)
 307                 Py_FatalError("error resizing Python tuple");
 308
 309         if (handler) {
 310                 retval = PyObject_CallObject(handler, t);
 311                 if (retval == NULL)
 312                         handler_call_die(handler_name);
 313         } else {
 314                 handler = PyDict_GetItemString(main_dict, "trace_unhandled");
 315                 if (handler && PyCallable_Check(handler)) {
 316
 317                         retval = PyObject_CallObject(handler, t);
 318                         if (retval == NULL)
 319                                 handler_call_die("trace_unhandled");
 320                 }
 321                 Py_DECREF(dict);
 322         }
 323
 324         Py_DECREF(t);
 325 }
 326
 327 static int run_start_sub(void)
 328 {
 329         PyObject *handler, *retval;
 330         int err = 0;
 331
 332         main_module = PyImport_AddModule("__main__");
 333         if (main_module == NULL)
 334                 return -1;
 335         Py_INCREF(main_module);
 336
 337         main_dict = PyModule_GetDict(main_module);
 338         if (main_dict == NULL) {
 339                 err = -1;
 340                 goto error;
 341         }
 342         Py_INCREF(main_dict);
 343
 344         handler = PyDict_GetItemString(main_dict, "trace_begin");
 345         if (handler == NULL || !PyCallable_Check(handler))
 346                 goto out;
 347
 348         retval = PyObject_CallObject(handler, NULL);
 349         if (retval == NULL)
 350                 handler_call_die("trace_begin");
 351
 352         Py_DECREF(retval);
 353         return err;
 354 error:
 355         Py_XDECREF(main_dict);
 356         Py_XDECREF(main_module);
 357 out:
 358         return err;
 359 }
 360
 361 /*
 362  * Start trace script
 363  */
 364 static int python_start_script(const char *script, int argc, const char **argv)
 365 {
 366         const char **command_line;
 367         char buf[PATH_MAX];
 368         int i, err = 0;
 369         FILE *fp;
 370
 371         command_line = malloc((argc + 1) * sizeof(const char *));
 372         command_line[0] = script;
 373         for (i = 1; i < argc + 1; i++)
 374                 command_line[i] = argv[i - 1];
 375
 376         Py_Initialize();
 377
 378         initperf_trace_context();
 379
 380         PySys_SetArgv(argc + 1, (char **)command_line);
 381
 382         fp = fopen(script, "r");
 383         if (!fp) {
 384                 sprintf(buf, "Can't open python script \"%s\"", script);
 385                 perror(buf);
 386                 err = -1;
 387                 goto error;
 388         }
 389
 390         err = PyRun_SimpleFile(fp, script);
 391         if (err) {
 392                 fprintf(stderr, "Error running python script %s\n", script);
 393                 goto error;
 394         }
 395
 396         err = run_start_sub();
 397         if (err) {
 398                 fprintf(stderr, "Error starting python script %s\n", script);
 399                 goto error;
 400         }
 401
 402         free(command_line);
 403
 404         return err;
 405 error:
 406         Py_Finalize();
 407         free(command_line);
 408
 409         return err;
 410 }
 411
 412 /*
 413  * Stop trace script
 414  */
 415 static int python_stop_script(void)
 416 {
 417         PyObject *handler, *retval;
 418         int err = 0;
 419
 420         handler = PyDict_GetItemString(main_dict, "trace_end");
 421         if (handler == NULL || !PyCallable_Check(handler))
 422                 goto out;
 423
 424         retval = PyObject_CallObject(handler, NULL);
 425         if (retval == NULL)
 426                 handler_call_die("trace_end");
 427         else
 428                 Py_DECREF(retval);
 429 out:
 430         Py_XDECREF(main_dict);
 431         Py_XDECREF(main_module);
 432         Py_Finalize();
 433
 434         return err;
 435 }
 436
 437 static int python_generate_script(const char *outfile)
 438 {
 439         struct event *event = NULL;
 440         struct format_field *f;
 441         char fname[PATH_MAX];
 442         int not_first, count;
 443         FILE *ofp;
 444
 445         sprintf(fname, "%s.py", outfile);
 446         ofp = fopen(fname, "w");
 447         if (ofp == NULL) {
 448                 fprintf(stderr, "couldn't open %s\n", fname);
 449                 return -1;
 450         }
 451         fprintf(ofp, "# perf script event handlers, "
 452                 "generated by perf script -g python\n");
 453
 454         fprintf(ofp, "# Licensed under the terms of the GNU GPL"
 455                 " License version 2\n\n");
 456
 457         fprintf(ofp, "# The common_* event handler fields are the most useful "
 458                 "fields common to\n");
 459
 460         fprintf(ofp, "# all events.  They don't necessarily correspond to "
 461                 "the 'common_*' fields\n");
 462
 463         fprintf(ofp, "# in the format files.  Those fields not available as "
 464                 "handler params can\n");
 465
 466         fprintf(ofp, "# be retrieved using Python functions of the form "
 467                 "common_*(context).\n");
 468
 469         fprintf(ofp, "# See the perf-trace-python Documentation for the list "
 470                 "of available functions.\n\n");
 471
 472         fprintf(ofp, "import os\n");
 473         fprintf(ofp, "import sys\n\n");
 474
 475         fprintf(ofp, "sys.path.append(os.environ['PERF_EXEC_PATH'] + \\\n");
 476         fprintf(ofp, "\t'/scripts/python/Perf-Trace-Util/lib/Perf/Trace')\n");
 477         fprintf(ofp, "\nfrom perf_trace_context import *\n");
 478         fprintf(ofp, "from Core import *\n\n\n");
 479
 480         fprintf(ofp, "def trace_begin():\n");
 481         fprintf(ofp, "\tprint \"in trace_begin\"\n\n");
 482
 483         fprintf(ofp, "def trace_end():\n");
 484         fprintf(ofp, "\tprint \"in trace_end\"\n\n");
 485
 486         while ((event = trace_find_next_event(event))) {
 487                 fprintf(ofp, "def %s__%s(", event->system, event->name);
 488                 fprintf(ofp, "event_name, ");
 489                 fprintf(ofp, "context, ");
 490                 fprintf(ofp, "common_cpu,\n");
 491                 fprintf(ofp, "\tcommon_secs, ");
 492                 fprintf(ofp, "common_nsecs, ");
 493                 fprintf(ofp, "common_pid, ");
 494                 fprintf(ofp, "common_comm,\n\t");
 495
 496                 not_first = 0;
 497                 count = 0;
 498
 499                 for (f = event->format.fields; f; f = f->next) {
 500                         if (not_first++)
 501                                 fprintf(ofp, ", ");
 502                         if (++count % 5 == 0)
 503                                 fprintf(ofp, "\n\t");
 504
 505                         fprintf(ofp, "%s", f->name);
 506                 }
 507                 fprintf(ofp, "):\n");
 508
 509                 fprintf(ofp, "\t\tprint_header(event_name, common_cpu, "
 510                         "common_secs, common_nsecs,\n\t\t\t"
 511                         "common_pid, common_comm)\n\n");
 512
 513                 fprintf(ofp, "\t\tprint \"");
 514
 515                 not_first = 0;
 516                 count = 0;
 517
 518                 for (f = event->format.fields; f; f = f->next) {
 519                         if (not_first++)
 520                                 fprintf(ofp, ", ");
 521                         if (count && count % 3 == 0) {
 522                                 fprintf(ofp, "\" \\\n\t\t\"");
 523                         }
 524                         count++;
 525
 526                         fprintf(ofp, "%s=", f->name);
 527                         if (f->flags & FIELD_IS_STRING ||
 528                             f->flags & FIELD_IS_FLAG ||
 529                             f->flags & FIELD_IS_SYMBOLIC)
 530                                 fprintf(ofp, "%%s");
 531                         else if (f->flags & FIELD_IS_SIGNED)
 532                                 fprintf(ofp, "%%d");
 533                         else
 534                                 fprintf(ofp, "%%u");
 535                 }
 536
 537                 fprintf(ofp, "\\n\" %% \\\n\t\t(");
 538
 539                 not_first = 0;
 540                 count = 0;
 541
 542                 for (f = event->format.fields; f; f = f->next) {
 543                         if (not_first++)
 544                                 fprintf(ofp, ", ");
 545
 546                         if (++count % 5 == 0)
 547                                 fprintf(ofp, "\n\t\t");
 548
 549                         if (f->flags & FIELD_IS_FLAG) {
 550                                 if ((count - 1) % 5 != 0) {
 551                                         fprintf(ofp, "\n\t\t");
 552                                         count = 4;
 553                                 }
 554                                 fprintf(ofp, "flag_str(\"");
 555                                 fprintf(ofp, "%s__%s\", ", event->system,
 556                                         event->name);
 557                                 fprintf(ofp, "\"%s\", %s)", f->name,
 558                                         f->name);
 559                         } else if (f->flags & FIELD_IS_SYMBOLIC) {
 560                                 if ((count - 1) % 5 != 0) {
 561                                         fprintf(ofp, "\n\t\t");
 562                                         count = 4;
 563                                 }
 564                                 fprintf(ofp, "symbol_str(\"");
 565                                 fprintf(ofp, "%s__%s\", ", event->system,
 566                                         event->name);
 567                                 fprintf(ofp, "\"%s\", %s)", f->name,
 568                                         f->name);
 569                         } else
 570                                 fprintf(ofp, "%s", f->name);
 571                 }
 572
 573                 fprintf(ofp, "),\n\n");
 574         }
 575
 576         fprintf(ofp, "def trace_unhandled(event_name, context, "
 577                 "event_fields_dict):\n");
 578
 579         fprintf(ofp, "\t\tprint ' '.join(['%%s=%%s'%%(k,str(v))"
 580                 "for k,v in sorted(event_fields_dict.items())])\n\n");
 581
 582         fprintf(ofp, "def print_header("
 583                 "event_name, cpu, secs, nsecs, pid, comm):\n"
 584                 "\tprint \"%%-20s %%5u %%05u.%%09u %%8u %%-20s \" %% \\\n\t"
 585                 "(event_name, cpu, secs, nsecs, pid, comm),\n");
 586
 587         fclose(ofp);
 588
 589         fprintf(stderr, "generated Python script: %s\n", fname);
 590
 591         return 0;
 592 }
 593
 594 struct scripting_ops python_scripting_ops = {
 595         .name = "Python",
 596         .start_script = python_start_script,
 597         .stop_script = python_stop_script,
 598         .process_event = python_process_event,
 599         .generate_script = python_generate_script,
 600 };