| 1 | # reader.py |
| 2 | # |
| 3 | # Babeltrace reader interface Python module |
| 4 | # |
| 5 | # Copyright 2012-2015 EfficiOS Inc. |
| 6 | # |
| 7 | # Author: Danny Serres <danny.serres@efficios.com> |
| 8 | # Author: Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 9 | # |
| 10 | # Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | # of this software and associated documentation files (the "Software"), to deal |
| 12 | # in the Software without restriction, including without limitation the rights |
| 13 | # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 14 | # copies of the Software, and to permit persons to whom the Software is |
| 15 | # furnished to do so, subject to the following conditions: |
| 16 | # |
| 17 | # The above copyright notice and this permission notice shall be included in |
| 18 | # all copies or substantial portions of the Software. |
| 19 | # |
| 20 | # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 23 | # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 25 | # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 26 | # SOFTWARE. |
| 27 | |
| 28 | import babeltrace.nativebt as nbt |
| 29 | import babeltrace.common as common |
| 30 | import collections |
| 31 | import os |
| 32 | from datetime import datetime |
| 33 | |
| 34 | |
| 35 | class TraceCollection: |
| 36 | """ |
| 37 | A :class:`TraceCollection` is a collection of opened traces. |
| 38 | |
| 39 | Once a trace collection is created, you can add traces to the |
| 40 | collection by using the :meth:`add_trace` or |
| 41 | :meth:`add_traces_recursive`, and then iterate on the merged |
| 42 | events using :attr:`events`. |
| 43 | |
| 44 | You may use :meth:`remove_trace` to close and remove a specific |
| 45 | trace from a trace collection. |
| 46 | """ |
| 47 | |
| 48 | def __init__(self): |
| 49 | """ |
| 50 | Creates an empty trace collection. |
| 51 | """ |
| 52 | |
| 53 | self._tc = nbt._bt_context_create() |
| 54 | |
| 55 | def __del__(self): |
| 56 | nbt._bt_context_put(self._tc) |
| 57 | |
| 58 | def add_trace(self, path, format_str): |
| 59 | """ |
| 60 | Adds a trace to the trace collection. |
| 61 | |
| 62 | *path* is the exact path of the trace on the filesystem. |
| 63 | |
| 64 | *format_str* is a string indicating the type of trace to |
| 65 | add. ``ctf`` is currently the only supported trace format. |
| 66 | |
| 67 | Returns the corresponding :class:`TraceHandle` instance for |
| 68 | this opened trace on success, or ``None`` on error. |
| 69 | |
| 70 | This function **does not** recurse directories to find a |
| 71 | trace. See :meth:`add_traces_recursive` for a recursive |
| 72 | version of this function. |
| 73 | """ |
| 74 | |
| 75 | ret = nbt._bt_context_add_trace(self._tc, path, format_str, |
| 76 | None, None, None) |
| 77 | |
| 78 | if ret < 0: |
| 79 | return None |
| 80 | |
| 81 | th = TraceHandle.__new__(TraceHandle) |
| 82 | th._id = ret |
| 83 | th._trace_collection = self |
| 84 | |
| 85 | return th |
| 86 | |
| 87 | def add_traces_recursive(self, path, format_str): |
| 88 | """ |
| 89 | Adds traces to this trace collection by recursively searching |
| 90 | in the *path* directory. |
| 91 | |
| 92 | *format_str* is a string indicating the type of trace to add. |
| 93 | ``ctf`` is currently the only supported trace format. |
| 94 | |
| 95 | Returns a :class:`dict` object mapping full paths to trace |
| 96 | handles for each trace found, or ``None`` on error. |
| 97 | |
| 98 | See also :meth:`add_trace`. |
| 99 | """ |
| 100 | |
| 101 | trace_handles = {} |
| 102 | noTrace = True |
| 103 | error = False |
| 104 | |
| 105 | for fullpath, dirs, files in os.walk(path): |
| 106 | if "metadata" in files: |
| 107 | trace_handle = self.add_trace(fullpath, format_str) |
| 108 | |
| 109 | if trace_handle is None: |
| 110 | error = True |
| 111 | continue |
| 112 | |
| 113 | trace_handles[fullpath] = trace_handle |
| 114 | noTrace = False |
| 115 | |
| 116 | if noTrace and error: |
| 117 | return None |
| 118 | |
| 119 | return trace_handles |
| 120 | |
| 121 | def remove_trace(self, trace_handle): |
| 122 | """ |
| 123 | Removes a trace from the trace collection using its trace |
| 124 | handle *trace_handle*. |
| 125 | |
| 126 | :class:`TraceHandle` objects are returned by :meth:`add_trace` |
| 127 | and :meth:`add_traces_recursive`. |
| 128 | """ |
| 129 | |
| 130 | try: |
| 131 | nbt._bt_context_remove_trace(self._tc, trace_handle._id) |
| 132 | except AttributeError: |
| 133 | raise TypeError("in remove_trace, argument 2 must be a TraceHandle instance") |
| 134 | |
| 135 | @property |
| 136 | def events(self): |
| 137 | """ |
| 138 | Generates the ordered :class:`Event` objects of all the opened |
| 139 | traces contained in this trace collection. |
| 140 | |
| 141 | Due to limitations of the native Babeltrace API, only one event |
| 142 | may be "alive" at a given time, i.e. a user **should never** |
| 143 | store a copy of the events returned by this function for |
| 144 | ulterior use. Users shall make sure to copy the information |
| 145 | they need *from* an event before accessing the next one. |
| 146 | """ |
| 147 | |
| 148 | begin_pos_ptr = nbt._bt_python_create_iter_pos() |
| 149 | end_pos_ptr = nbt._bt_python_create_iter_pos() |
| 150 | begin_pos_ptr.type = nbt.SEEK_BEGIN |
| 151 | end_pos_ptr.type = nbt.SEEK_LAST |
| 152 | |
| 153 | for event in self._events(begin_pos_ptr, end_pos_ptr): |
| 154 | yield event |
| 155 | |
| 156 | nbt._bt_iter_free_pos(begin_pos_ptr) |
| 157 | nbt._bt_iter_free_pos(end_pos_ptr) |
| 158 | |
| 159 | def events_timestamps(self, timestamp_begin, timestamp_end): |
| 160 | """ |
| 161 | Generates the ordered :class:`Event` objects of all the opened |
| 162 | traces contained in this trace collection from *timestamp_begin* |
| 163 | to *timestamp_end*. |
| 164 | |
| 165 | *timestamp_begin* and *timestamp_end* are given in nanoseconds |
| 166 | since Epoch. |
| 167 | |
| 168 | See :attr:`events` for notes and limitations. |
| 169 | """ |
| 170 | |
| 171 | begin_pos_ptr = nbt._bt_python_create_iter_pos() |
| 172 | end_pos_ptr = nbt._bt_python_create_iter_pos() |
| 173 | begin_pos_ptr.type = end_pos_ptr.type = nbt.SEEK_TIME |
| 174 | begin_pos_ptr.u.seek_time = timestamp_begin |
| 175 | end_pos_ptr.u.seek_time = timestamp_end |
| 176 | |
| 177 | for event in self._events(begin_pos_ptr, end_pos_ptr): |
| 178 | yield event |
| 179 | |
| 180 | nbt._bt_iter_free_pos(begin_pos_ptr) |
| 181 | nbt._bt_iter_free_pos(end_pos_ptr) |
| 182 | |
| 183 | @property |
| 184 | def timestamp_begin(self): |
| 185 | """ |
| 186 | Begin timestamp of this trace collection (nanoseconds since |
| 187 | Epoch). |
| 188 | """ |
| 189 | |
| 190 | pos_ptr = nbt._bt_iter_pos() |
| 191 | pos_ptr.type = nbt.SEEK_BEGIN |
| 192 | |
| 193 | return self._timestamp_at_pos(pos_ptr) |
| 194 | |
| 195 | @property |
| 196 | def timestamp_end(self): |
| 197 | """ |
| 198 | End timestamp of this trace collection (nanoseconds since |
| 199 | Epoch). |
| 200 | """ |
| 201 | |
| 202 | pos_ptr = nbt._bt_iter_pos() |
| 203 | pos_ptr.type = nbt.SEEK_LAST |
| 204 | |
| 205 | return self._timestamp_at_pos(pos_ptr) |
| 206 | |
| 207 | def _timestamp_at_pos(self, pos_ptr): |
| 208 | ctf_it_ptr = nbt._bt_ctf_iter_create(self._tc, pos_ptr, pos_ptr) |
| 209 | |
| 210 | if ctf_it_ptr is None: |
| 211 | raise NotImplementedError("Creation of multiple iterators is unsupported.") |
| 212 | |
| 213 | ev_ptr = nbt._bt_ctf_iter_read_event(ctf_it_ptr) |
| 214 | nbt._bt_ctf_iter_destroy(ctf_it_ptr) |
| 215 | |
| 216 | ev = Event.__new__(Event) |
| 217 | ev._e = ev_ptr |
| 218 | |
| 219 | return ev.timestamp |
| 220 | |
| 221 | def _events(self, begin_pos_ptr, end_pos_ptr): |
| 222 | ctf_it_ptr = nbt._bt_ctf_iter_create(self._tc, begin_pos_ptr, end_pos_ptr) |
| 223 | |
| 224 | if ctf_it_ptr is None: |
| 225 | raise NotImplementedError("Creation of multiple iterators is unsupported.") |
| 226 | |
| 227 | while True: |
| 228 | ev_ptr = nbt._bt_ctf_iter_read_event(ctf_it_ptr) |
| 229 | |
| 230 | if ev_ptr is None: |
| 231 | break |
| 232 | |
| 233 | ev = Event.__new__(Event) |
| 234 | ev._e = ev_ptr |
| 235 | |
| 236 | try: |
| 237 | yield ev |
| 238 | except GeneratorExit: |
| 239 | break |
| 240 | |
| 241 | ret = nbt._bt_iter_next(nbt._bt_ctf_get_iter(ctf_it_ptr)) |
| 242 | |
| 243 | if ret != 0: |
| 244 | break |
| 245 | |
| 246 | nbt._bt_ctf_iter_destroy(ctf_it_ptr) |
| 247 | |
| 248 | |
| 249 | # Based on enum bt_clock_type in clock-type.h |
| 250 | class _ClockType: |
| 251 | CLOCK_CYCLES = 0 |
| 252 | CLOCK_REAL = 1 |
| 253 | |
| 254 | |
| 255 | class TraceHandle: |
| 256 | """ |
| 257 | A :class:`TraceHandle` is a handle allowing the user to manipulate |
| 258 | a specific trace directly. It is a unique identifier representing a |
| 259 | trace, and is not meant to be instantiated by the user. |
| 260 | """ |
| 261 | |
| 262 | def __init__(self): |
| 263 | raise NotImplementedError("TraceHandle cannot be instantiated") |
| 264 | |
| 265 | def __repr__(self): |
| 266 | return "Babeltrace TraceHandle: trace_id('{0}')".format(self._id) |
| 267 | |
| 268 | @property |
| 269 | def id(self): |
| 270 | """ |
| 271 | Numeric ID of this trace handle. |
| 272 | """ |
| 273 | |
| 274 | return self._id |
| 275 | |
| 276 | @property |
| 277 | def path(self): |
| 278 | """ |
| 279 | Path of the underlying trace. |
| 280 | """ |
| 281 | |
| 282 | return nbt._bt_trace_handle_get_path(self._trace_collection._tc, |
| 283 | self._id) |
| 284 | |
| 285 | @property |
| 286 | def timestamp_begin(self): |
| 287 | """ |
| 288 | Buffers creation timestamp (nanoseconds since Epoch) of the |
| 289 | underlying trace. |
| 290 | """ |
| 291 | |
| 292 | ret, value = nbt._bt_trace_handle_get_timestamp_begin( |
| 293 | self._trace_collection._tc, self._id, _ClockType.CLOCK_REAL) |
| 294 | if ret != 0: |
| 295 | raise ValueError("Invalid TraceHandle") |
| 296 | return value |
| 297 | |
| 298 | @property |
| 299 | def timestamp_end(self): |
| 300 | """ |
| 301 | Buffers destruction timestamp (nanoseconds since Epoch) of the |
| 302 | underlying trace. |
| 303 | """ |
| 304 | |
| 305 | ret, value = nbt._bt_trace_handle_get_timestamp_end( |
| 306 | self._trace_collection._tc, self._id, _ClockType.CLOCK_REAL) |
| 307 | if ret != 0: |
| 308 | raise ValueError("Invalid TraceHandle") |
| 309 | return value |
| 310 | |
| 311 | @property |
| 312 | def events(self): |
| 313 | """ |
| 314 | Generates all the :class:`EventDeclaration` objects of the |
| 315 | underlying trace. |
| 316 | """ |
| 317 | |
| 318 | ret = nbt._bt_python_event_decl_listcaller(self.id, |
| 319 | self._trace_collection._tc) |
| 320 | |
| 321 | if not isinstance(ret, list): |
| 322 | return |
| 323 | |
| 324 | ptr_list, count = ret |
| 325 | |
| 326 | for i in range(count): |
| 327 | tmp = EventDeclaration.__new__(EventDeclaration) |
| 328 | tmp._ed = nbt._bt_python_decl_one_from_list(ptr_list, i) |
| 329 | yield tmp |
| 330 | |
| 331 | |
| 332 | |
| 333 | |
| 334 | # Priority of the scopes when searching for event fields |
| 335 | _scopes = [ |
| 336 | common.CTFScope.EVENT_FIELDS, |
| 337 | common.CTFScope.EVENT_CONTEXT, |
| 338 | common.CTFScope.STREAM_EVENT_CONTEXT, |
| 339 | common.CTFScope.STREAM_EVENT_HEADER, |
| 340 | common.CTFScope.STREAM_PACKET_CONTEXT, |
| 341 | common.CTFScope.TRACE_PACKET_HEADER |
| 342 | ] |
| 343 | |
| 344 | |
| 345 | class Event(collections.Mapping): |
| 346 | """ |
| 347 | An :class:`Event` object represents a trace event. :class:`Event` |
| 348 | objects are returned by :attr:`TraceCollection.events` and are |
| 349 | not meant to be instantiated by the user. |
| 350 | |
| 351 | :class:`Event` has a :class:`dict`-like interface for accessing |
| 352 | an event's field value by field name: |
| 353 | |
| 354 | .. code-block:: python |
| 355 | |
| 356 | event['my_field'] |
| 357 | |
| 358 | If a field name exists in multiple scopes, the value of the first |
| 359 | field found is returned. The scopes are searched in the following |
| 360 | order: |
| 361 | |
| 362 | 1. Event fields (:attr:`babeltrace.common.CTFScope.EVENT_FIELDS`) |
| 363 | 2. Event context (:attr:`babeltrace.common.CTFScope.EVENT_CONTEXT`) |
| 364 | 3. Stream event context (:attr:`babeltrace.common.CTFScope.STREAM_EVENT_CONTEXT`) |
| 365 | 4. Event header (:attr:`babeltrace.common.CTFScope.STREAM_EVENT_HEADER`) |
| 366 | 5. Packet context (:attr:`babeltrace.common.CTFScope.STREAM_PACKET_CONTEXT`) |
| 367 | 6. Packet header (:attr:`babeltrace.common.CTFScope.TRACE_PACKET_HEADER`) |
| 368 | |
| 369 | It is still possible to obtain a field's value from a specific |
| 370 | scope using :meth:`field_with_scope`. |
| 371 | |
| 372 | Field values are returned as native Python types, that is: |
| 373 | |
| 374 | +-----------------------+----------------------------------+ |
| 375 | | Field type | Python type | |
| 376 | +=======================+==================================+ |
| 377 | | Integer | :class:`int` | |
| 378 | +-----------------------+----------------------------------+ |
| 379 | | Floating point number | :class:`float` | |
| 380 | +-----------------------+----------------------------------+ |
| 381 | | Enumeration | :class:`str` (enumeration label) | |
| 382 | +-----------------------+----------------------------------+ |
| 383 | | String | :class:`str` | |
| 384 | +-----------------------+----------------------------------+ |
| 385 | | Array | :class:`list` of native Python | |
| 386 | | | objects | |
| 387 | +-----------------------+----------------------------------+ |
| 388 | | Sequence | :class:`list` of native Python | |
| 389 | | | objects | |
| 390 | +-----------------------+----------------------------------+ |
| 391 | | Structure | :class:`dict` mapping field | |
| 392 | | | names to native Python objects | |
| 393 | +-----------------------+----------------------------------+ |
| 394 | |
| 395 | For example, printing the third element of a sequence named ``seq`` |
| 396 | in a structure named ``my_struct`` of the ``event``'s field named |
| 397 | ``my_field`` is done this way: |
| 398 | |
| 399 | .. code-block:: python |
| 400 | |
| 401 | print(event['my_field']['my_struct']['seq'][2]) |
| 402 | """ |
| 403 | |
| 404 | def __init__(self): |
| 405 | raise NotImplementedError("Event cannot be instantiated") |
| 406 | |
| 407 | @property |
| 408 | def name(self): |
| 409 | """ |
| 410 | Event name or ``None`` on error. |
| 411 | """ |
| 412 | |
| 413 | return nbt._bt_ctf_event_name(self._e) |
| 414 | |
| 415 | @property |
| 416 | def cycles(self): |
| 417 | """ |
| 418 | Event timestamp in cycles or -1 on error. |
| 419 | """ |
| 420 | |
| 421 | return nbt._bt_ctf_get_cycles(self._e) |
| 422 | |
| 423 | @property |
| 424 | def timestamp(self): |
| 425 | """ |
| 426 | Event timestamp (nanoseconds since Epoch). |
| 427 | """ |
| 428 | |
| 429 | ret, value = nbt._bt_ctf_get_timestamp(self._e) |
| 430 | if ret < 0: |
| 431 | raise RuntimeError("Failed to get event timestamp") |
| 432 | return value |
| 433 | |
| 434 | @property |
| 435 | def datetime(self): |
| 436 | """ |
| 437 | Event timestamp as a standard :class:`datetime.datetime` |
| 438 | object. |
| 439 | |
| 440 | Note that the :class:`datetime.datetime` class' precision |
| 441 | is limited to microseconds, whereas :attr:`timestamp` provides |
| 442 | the event's timestamp with a nanosecond resolution. |
| 443 | """ |
| 444 | |
| 445 | return datetime.fromtimestamp(self.timestamp / 1E9) |
| 446 | |
| 447 | def field_with_scope(self, field_name, scope): |
| 448 | """ |
| 449 | Returns the value of a field named *field_name* within the |
| 450 | scope *scope*, or ``None`` if the field cannot be found. |
| 451 | |
| 452 | *scope* must be one of :class:`babeltrace.common.CTFScope` |
| 453 | constants. |
| 454 | """ |
| 455 | |
| 456 | if scope not in _scopes: |
| 457 | raise ValueError("Invalid scope provided") |
| 458 | |
| 459 | field = self._field_with_scope(field_name, scope) |
| 460 | |
| 461 | if field is not None: |
| 462 | return field.value |
| 463 | |
| 464 | def field_list_with_scope(self, scope): |
| 465 | """ |
| 466 | Returns a list of field names in the scope *scope*. |
| 467 | """ |
| 468 | |
| 469 | if scope not in _scopes: |
| 470 | raise ValueError("Invalid scope provided") |
| 471 | |
| 472 | field_names = [] |
| 473 | |
| 474 | for field in self._field_list_with_scope(scope): |
| 475 | field_names.append(field.name) |
| 476 | |
| 477 | return field_names |
| 478 | |
| 479 | @property |
| 480 | def handle(self): |
| 481 | """ |
| 482 | :class:`TraceHandle` object containing this event, or ``None`` |
| 483 | on error. |
| 484 | """ |
| 485 | |
| 486 | ret = nbt._bt_ctf_event_get_handle_id(self._e) |
| 487 | |
| 488 | if ret < 0: |
| 489 | return None |
| 490 | |
| 491 | th = TraceHandle.__new__(TraceHandle) |
| 492 | th._id = ret |
| 493 | th._trace_collection = self.get_trace_collection() |
| 494 | |
| 495 | return th |
| 496 | |
| 497 | @property |
| 498 | def trace_collection(self): |
| 499 | """ |
| 500 | :class:`TraceCollection` object containing this event, or |
| 501 | ``None`` on error. |
| 502 | """ |
| 503 | |
| 504 | trace_collection = TraceCollection() |
| 505 | trace_collection._tc = nbt._bt_ctf_event_get_context(self._e) |
| 506 | |
| 507 | if trace_collection._tc is not None: |
| 508 | return trace_collection |
| 509 | |
| 510 | def __getitem__(self, field_name): |
| 511 | field = self._field(field_name) |
| 512 | |
| 513 | if field is not None: |
| 514 | return field.value |
| 515 | |
| 516 | raise KeyError(field_name) |
| 517 | |
| 518 | def __iter__(self): |
| 519 | for key in self.keys(): |
| 520 | yield key |
| 521 | |
| 522 | def __len__(self): |
| 523 | count = 0 |
| 524 | |
| 525 | for scope in _scopes: |
| 526 | scope_ptr = nbt._bt_ctf_get_top_level_scope(self._e, scope) |
| 527 | ret = nbt._bt_python_field_listcaller(self._e, scope_ptr) |
| 528 | |
| 529 | if isinstance(ret, list): |
| 530 | count += ret[1] |
| 531 | |
| 532 | return count |
| 533 | |
| 534 | def __contains__(self, field_name): |
| 535 | return self._field(field_name) is not None |
| 536 | |
| 537 | def keys(self): |
| 538 | """ |
| 539 | Returns the list of field names. |
| 540 | |
| 541 | Note: field names are unique within the returned list, although |
| 542 | a field name could exist in multiple scopes. Use |
| 543 | :meth:`field_list_with_scope` to obtain the list of field names |
| 544 | of a given scope. |
| 545 | """ |
| 546 | |
| 547 | field_names = set() |
| 548 | |
| 549 | for scope in _scopes: |
| 550 | for name in self.field_list_with_scope(scope): |
| 551 | field_names.add(name) |
| 552 | |
| 553 | return list(field_names) |
| 554 | |
| 555 | def get(self, field_name, default=None): |
| 556 | """ |
| 557 | Returns the value of the field named *field_name*, or *default* |
| 558 | when not found. |
| 559 | |
| 560 | See :class:`Event` note about how fields are retrieved by |
| 561 | name when multiple fields share the same name in different |
| 562 | scopes. |
| 563 | """ |
| 564 | |
| 565 | field = self._field(field_name) |
| 566 | |
| 567 | if field is None: |
| 568 | return default |
| 569 | |
| 570 | return field.value |
| 571 | |
| 572 | def items(self): |
| 573 | """ |
| 574 | Generates pairs of (field name, field value). |
| 575 | |
| 576 | This method iterates :meth:`keys` to find field names, which |
| 577 | means some fields could be unavailable if other fields share |
| 578 | their names in scopes with higher priorities. |
| 579 | """ |
| 580 | |
| 581 | for field in self.keys(): |
| 582 | yield (field, self[field]) |
| 583 | |
| 584 | def _field_with_scope(self, field_name, scope): |
| 585 | scope_ptr = nbt._bt_ctf_get_top_level_scope(self._e, scope) |
| 586 | |
| 587 | if scope_ptr is None: |
| 588 | return None |
| 589 | |
| 590 | definition_ptr = nbt._bt_ctf_get_field(self._e, scope_ptr, field_name) |
| 591 | |
| 592 | if definition_ptr is None: |
| 593 | return None |
| 594 | |
| 595 | field = _Definition(definition_ptr, scope) |
| 596 | |
| 597 | return field |
| 598 | |
| 599 | def _field(self, field_name): |
| 600 | field = None |
| 601 | |
| 602 | for scope in _scopes: |
| 603 | field = self._field_with_scope(field_name, scope) |
| 604 | |
| 605 | if field is not None: |
| 606 | break |
| 607 | |
| 608 | return field |
| 609 | |
| 610 | def _field_list_with_scope(self, scope): |
| 611 | fields = [] |
| 612 | scope_ptr = nbt._bt_ctf_get_top_level_scope(self._e, scope) |
| 613 | |
| 614 | # Returns a list [list_ptr, count]. If list_ptr is NULL, SWIG will only |
| 615 | # provide the "count" return value |
| 616 | count = 0 |
| 617 | list_ptr = None |
| 618 | ret = nbt._bt_python_field_listcaller(self._e, scope_ptr) |
| 619 | |
| 620 | if isinstance(ret, list): |
| 621 | list_ptr, count = ret |
| 622 | |
| 623 | for i in range(count): |
| 624 | definition_ptr = nbt._bt_python_field_one_from_list(list_ptr, i) |
| 625 | |
| 626 | if definition_ptr is not None: |
| 627 | definition = _Definition(definition_ptr, scope) |
| 628 | fields.append(definition) |
| 629 | |
| 630 | return fields |
| 631 | |
| 632 | |
| 633 | class FieldError(Exception): |
| 634 | """ |
| 635 | Field error, raised when the value of a field cannot be accessed. |
| 636 | """ |
| 637 | |
| 638 | def __init__(self, value): |
| 639 | self.value = value |
| 640 | |
| 641 | def __str__(self): |
| 642 | return repr(self.value) |
| 643 | |
| 644 | |
| 645 | class EventDeclaration: |
| 646 | """ |
| 647 | An event declaration contains the properties of a class of events, |
| 648 | that is, the common properties and fields layout of all the actual |
| 649 | recorded events associated with this declaration. |
| 650 | |
| 651 | This class is not meant to be instantiated by the user. It is |
| 652 | returned by :attr:`TraceHandle.events`. |
| 653 | """ |
| 654 | |
| 655 | MAX_UINT64 = 0xFFFFFFFFFFFFFFFF |
| 656 | |
| 657 | def __init__(self): |
| 658 | raise NotImplementedError("EventDeclaration cannot be instantiated") |
| 659 | |
| 660 | @property |
| 661 | def name(self): |
| 662 | """ |
| 663 | Event name, or ``None`` on error. |
| 664 | """ |
| 665 | |
| 666 | return nbt._bt_ctf_get_decl_event_name(self._ed) |
| 667 | |
| 668 | @property |
| 669 | def id(self): |
| 670 | """ |
| 671 | Event numeric ID, or -1 on error. |
| 672 | """ |
| 673 | |
| 674 | id = nbt._bt_ctf_get_decl_event_id(self._ed) |
| 675 | |
| 676 | if id == self.MAX_UINT64: |
| 677 | id = -1 |
| 678 | |
| 679 | return id |
| 680 | |
| 681 | @property |
| 682 | def fields(self): |
| 683 | """ |
| 684 | Generates all the field declarations of this event, going |
| 685 | through each scope in the following order: |
| 686 | |
| 687 | 1. Event fields (:attr:`babeltrace.common.CTFScope.EVENT_FIELDS`) |
| 688 | 2. Event context (:attr:`babeltrace.common.CTFScope.EVENT_CONTEXT`) |
| 689 | 3. Stream event context (:attr:`babeltrace.common.CTFScope.STREAM_EVENT_CONTEXT`) |
| 690 | 4. Event header (:attr:`babeltrace.common.CTFScope.STREAM_EVENT_HEADER`) |
| 691 | 5. Packet context (:attr:`babeltrace.common.CTFScope.STREAM_PACKET_CONTEXT`) |
| 692 | 6. Packet header (:attr:`babeltrace.common.CTFScope.TRACE_PACKET_HEADER`) |
| 693 | |
| 694 | All the generated field declarations inherit |
| 695 | :class:`FieldDeclaration`, and are among: |
| 696 | |
| 697 | * :class:`IntegerFieldDeclaration` |
| 698 | * :class:`FloatFieldDeclaration` |
| 699 | * :class:`EnumerationFieldDeclaration` |
| 700 | * :class:`StringFieldDeclaration` |
| 701 | * :class:`ArrayFieldDeclaration` |
| 702 | * :class:`SequenceFieldDeclaration` |
| 703 | * :class:`StructureFieldDeclaration` |
| 704 | * :class:`VariantFieldDeclaration` |
| 705 | """ |
| 706 | |
| 707 | for scope in _scopes: |
| 708 | for declaration in self.fields_scope(scope): |
| 709 | yield declaration |
| 710 | |
| 711 | def fields_scope(self, scope): |
| 712 | """ |
| 713 | Generates all the field declarations of the event's scope |
| 714 | *scope*. |
| 715 | |
| 716 | *scope* must be one of :class:`babeltrace.common.CTFScope` constants. |
| 717 | |
| 718 | All the generated field declarations inherit |
| 719 | :class:`FieldDeclaration`, and are among: |
| 720 | |
| 721 | * :class:`IntegerFieldDeclaration` |
| 722 | * :class:`FloatFieldDeclaration` |
| 723 | * :class:`EnumerationFieldDeclaration` |
| 724 | * :class:`StringFieldDeclaration` |
| 725 | * :class:`ArrayFieldDeclaration` |
| 726 | * :class:`SequenceFieldDeclaration` |
| 727 | * :class:`StructureFieldDeclaration` |
| 728 | * :class:`VariantFieldDeclaration` |
| 729 | """ |
| 730 | ret = nbt._by_python_field_decl_listcaller(self._ed, scope) |
| 731 | |
| 732 | if not isinstance(ret, list): |
| 733 | return |
| 734 | |
| 735 | list_ptr, count = ret |
| 736 | |
| 737 | for i in range(count): |
| 738 | field_decl_ptr = nbt._bt_python_field_decl_one_from_list(list_ptr, i) |
| 739 | |
| 740 | if field_decl_ptr is not None: |
| 741 | decl_ptr = nbt._bt_ctf_get_decl_from_field_decl(field_decl_ptr) |
| 742 | name = nbt._bt_ctf_get_decl_field_name(field_decl_ptr) |
| 743 | field_declaration = _create_field_declaration(decl_ptr, name, |
| 744 | scope) |
| 745 | yield field_declaration |
| 746 | |
| 747 | |
| 748 | class FieldDeclaration: |
| 749 | """ |
| 750 | Base class for concrete field declarations. |
| 751 | |
| 752 | This class is not meant to be instantiated by the user. |
| 753 | """ |
| 754 | |
| 755 | def __init__(self): |
| 756 | raise NotImplementedError("FieldDeclaration cannot be instantiated") |
| 757 | |
| 758 | def __repr__(self): |
| 759 | return "({0}) {1} {2}".format(common.CTFScope.scope_name(self.scope), |
| 760 | common.CTFTypeId.type_name(self.type), |
| 761 | self.name) |
| 762 | |
| 763 | @property |
| 764 | def name(self): |
| 765 | """ |
| 766 | Field name, or ``None`` on error. |
| 767 | """ |
| 768 | |
| 769 | return self._name |
| 770 | |
| 771 | @property |
| 772 | def type(self): |
| 773 | """ |
| 774 | Field type (one of :class:`babeltrace.common.CTFTypeId` |
| 775 | constants). |
| 776 | """ |
| 777 | |
| 778 | return nbt._bt_ctf_field_type(self._fd) |
| 779 | |
| 780 | @property |
| 781 | def scope(self): |
| 782 | """ |
| 783 | Field scope (one of:class:`babeltrace.common.CTFScope` |
| 784 | constants). |
| 785 | """ |
| 786 | |
| 787 | return self._s |
| 788 | |
| 789 | |
| 790 | class IntegerFieldDeclaration(FieldDeclaration): |
| 791 | """ |
| 792 | Integer field declaration. |
| 793 | """ |
| 794 | |
| 795 | def __init__(self): |
| 796 | raise NotImplementedError("IntegerFieldDeclaration cannot be instantiated") |
| 797 | |
| 798 | @property |
| 799 | def signedness(self): |
| 800 | """ |
| 801 | 0 if this integer is unsigned, 1 if signed, or -1 on error. |
| 802 | """ |
| 803 | |
| 804 | return nbt._bt_ctf_get_int_signedness(self._fd) |
| 805 | |
| 806 | @property |
| 807 | def base(self): |
| 808 | """ |
| 809 | Integer base (:class:`int`), or a negative value on error. |
| 810 | """ |
| 811 | |
| 812 | return nbt._bt_ctf_get_int_base(self._fd) |
| 813 | |
| 814 | @property |
| 815 | def byte_order(self): |
| 816 | """ |
| 817 | Integer byte order (one of |
| 818 | :class:`babeltrace.common.ByteOrder` constants). |
| 819 | """ |
| 820 | |
| 821 | ret = nbt._bt_ctf_get_int_byte_order(self._fd) |
| 822 | |
| 823 | if ret == 1234: |
| 824 | return common.ByteOrder.BYTE_ORDER_LITTLE_ENDIAN |
| 825 | elif ret == 4321: |
| 826 | return common.ByteOrder.BYTE_ORDER_BIG_ENDIAN |
| 827 | else: |
| 828 | return common.ByteOrder.BYTE_ORDER_UNKNOWN |
| 829 | |
| 830 | @property |
| 831 | def size(self): |
| 832 | """ |
| 833 | Integer size in bits, or a negative value on error. |
| 834 | """ |
| 835 | return nbt._bt_ctf_get_int_len(self._fd) |
| 836 | |
| 837 | @property |
| 838 | def length(self): |
| 839 | return self.size |
| 840 | |
| 841 | @property |
| 842 | def encoding(self): |
| 843 | """ |
| 844 | Integer encoding (one of |
| 845 | :class:`babeltrace.common.CTFStringEncoding` constants). |
| 846 | """ |
| 847 | |
| 848 | return nbt._bt_ctf_get_encoding(self._fd) |
| 849 | |
| 850 | |
| 851 | class EnumerationFieldDeclaration(FieldDeclaration): |
| 852 | """ |
| 853 | Enumeration field declaration. |
| 854 | |
| 855 | .. note:: |
| 856 | |
| 857 | As of this version, this class is missing some properties. |
| 858 | """ |
| 859 | |
| 860 | def __init__(self): |
| 861 | raise NotImplementedError("EnumerationFieldDeclaration cannot be instantiated") |
| 862 | |
| 863 | |
| 864 | class ArrayFieldDeclaration(FieldDeclaration): |
| 865 | """ |
| 866 | Static array field declaration. |
| 867 | """ |
| 868 | |
| 869 | def __init__(self): |
| 870 | raise NotImplementedError("ArrayFieldDeclaration cannot be instantiated") |
| 871 | |
| 872 | @property |
| 873 | def length(self): |
| 874 | """ |
| 875 | Fixed length of this static array (number of contained |
| 876 | elements), or a negative value on error. |
| 877 | """ |
| 878 | |
| 879 | return nbt._bt_ctf_get_array_len(self._fd) |
| 880 | |
| 881 | @property |
| 882 | def element_declaration(self): |
| 883 | """ |
| 884 | Field declaration of the underlying element. |
| 885 | """ |
| 886 | |
| 887 | field_decl_ptr = nbt._bt_python_get_array_element_declaration(self._fd) |
| 888 | |
| 889 | return _create_field_declaration(field_decl_ptr, "", self.scope) |
| 890 | |
| 891 | |
| 892 | class SequenceFieldDeclaration(FieldDeclaration): |
| 893 | """ |
| 894 | Sequence (dynamic array) field declaration. |
| 895 | |
| 896 | .. note:: |
| 897 | |
| 898 | As of this version, this class is missing some properties. |
| 899 | """ |
| 900 | |
| 901 | def __init__(self): |
| 902 | raise NotImplementedError("SequenceFieldDeclaration cannot be instantiated") |
| 903 | |
| 904 | @property |
| 905 | def element_declaration(self): |
| 906 | """ |
| 907 | Field declaration of the underlying element. |
| 908 | """ |
| 909 | |
| 910 | field_decl_ptr = nbt._bt_python_get_sequence_element_declaration(self._fd) |
| 911 | |
| 912 | return _create_field_declaration(field_decl_ptr, "", self.scope) |
| 913 | |
| 914 | |
| 915 | class FloatFieldDeclaration(FieldDeclaration): |
| 916 | """ |
| 917 | Floating point number field declaration. |
| 918 | |
| 919 | .. note:: |
| 920 | |
| 921 | As of this version, this class is missing some properties. |
| 922 | """ |
| 923 | |
| 924 | def __init__(self): |
| 925 | raise NotImplementedError("FloatFieldDeclaration cannot be instantiated") |
| 926 | |
| 927 | |
| 928 | class StructureFieldDeclaration(FieldDeclaration): |
| 929 | """ |
| 930 | Structure (ordered map of field names to field declarations) field |
| 931 | declaration. |
| 932 | |
| 933 | .. note:: |
| 934 | |
| 935 | As of this version, this class is missing some properties. |
| 936 | """ |
| 937 | |
| 938 | def __init__(self): |
| 939 | raise NotImplementedError("StructureFieldDeclaration cannot be instantiated") |
| 940 | |
| 941 | |
| 942 | class StringFieldDeclaration(FieldDeclaration): |
| 943 | """ |
| 944 | String (NULL-terminated array of bytes) field declaration. |
| 945 | |
| 946 | .. note:: |
| 947 | |
| 948 | As of this version, this class is missing some properties. |
| 949 | """ |
| 950 | |
| 951 | def __init__(self): |
| 952 | raise NotImplementedError("StringFieldDeclaration cannot be instantiated") |
| 953 | |
| 954 | |
| 955 | class VariantFieldDeclaration(FieldDeclaration): |
| 956 | """ |
| 957 | Variant (dynamic selection between different types) field declaration. |
| 958 | |
| 959 | .. note:: |
| 960 | |
| 961 | As of this version, this class is missing some properties. |
| 962 | """ |
| 963 | |
| 964 | def __init__(self): |
| 965 | raise NotImplementedError("VariantFieldDeclaration cannot be instantiated") |
| 966 | |
| 967 | |
| 968 | def field_error(): |
| 969 | """ |
| 970 | Return the last error code encountered while |
| 971 | accessing a field and reset the error flag. |
| 972 | Return 0 if no error, a negative value otherwise. |
| 973 | """ |
| 974 | |
| 975 | return nbt._bt_ctf_field_get_error() |
| 976 | |
| 977 | |
| 978 | def _create_field_declaration(declaration_ptr, name, scope): |
| 979 | """ |
| 980 | Private field declaration factory. |
| 981 | """ |
| 982 | |
| 983 | if declaration_ptr is None: |
| 984 | raise ValueError("declaration_ptr must be valid") |
| 985 | if scope not in _scopes: |
| 986 | raise ValueError("Invalid scope provided") |
| 987 | |
| 988 | type = nbt._bt_ctf_field_type(declaration_ptr) |
| 989 | declaration = None |
| 990 | |
| 991 | if type == common.CTFTypeId.INTEGER: |
| 992 | declaration = IntegerFieldDeclaration.__new__(IntegerFieldDeclaration) |
| 993 | elif type == common.CTFTypeId.ENUM: |
| 994 | declaration = EnumerationFieldDeclaration.__new__(EnumerationFieldDeclaration) |
| 995 | elif type == common.CTFTypeId.ARRAY: |
| 996 | declaration = ArrayFieldDeclaration.__new__(ArrayFieldDeclaration) |
| 997 | elif type == common.CTFTypeId.SEQUENCE: |
| 998 | declaration = SequenceFieldDeclaration.__new__(SequenceFieldDeclaration) |
| 999 | elif type == common.CTFTypeId.FLOAT: |
| 1000 | declaration = FloatFieldDeclaration.__new__(FloatFieldDeclaration) |
| 1001 | elif type == common.CTFTypeId.STRUCT: |
| 1002 | declaration = StructureFieldDeclaration.__new__(StructureFieldDeclaration) |
| 1003 | elif type == common.CTFTypeId.STRING: |
| 1004 | declaration = StringFieldDeclaration.__new__(StringFieldDeclaration) |
| 1005 | elif type == common.CTFTypeId.VARIANT: |
| 1006 | declaration = VariantFieldDeclaration.__new__(VariantFieldDeclaration) |
| 1007 | else: |
| 1008 | return declaration |
| 1009 | |
| 1010 | declaration._fd = declaration_ptr |
| 1011 | declaration._s = scope |
| 1012 | declaration._name = name |
| 1013 | |
| 1014 | return declaration |
| 1015 | |
| 1016 | |
| 1017 | class _Definition: |
| 1018 | def __init__(self, definition_ptr, scope): |
| 1019 | self._d = definition_ptr |
| 1020 | self._s = scope |
| 1021 | |
| 1022 | if scope not in _scopes: |
| 1023 | ValueError("Invalid scope provided") |
| 1024 | |
| 1025 | @property |
| 1026 | def name(self): |
| 1027 | """Return the name of a field or None on error.""" |
| 1028 | |
| 1029 | return nbt._bt_ctf_field_name(self._d) |
| 1030 | |
| 1031 | @property |
| 1032 | def type(self): |
| 1033 | """Return the type of a field or -1 if unknown.""" |
| 1034 | |
| 1035 | return nbt._bt_ctf_field_type(nbt._bt_ctf_get_decl_from_def(self._d)) |
| 1036 | |
| 1037 | @property |
| 1038 | def declaration(self): |
| 1039 | """Return the associated Definition object.""" |
| 1040 | |
| 1041 | return _create_field_declaration( |
| 1042 | nbt._bt_ctf_get_decl_from_def(self._d), self.name, self.scope) |
| 1043 | |
| 1044 | def _get_enum_str(self): |
| 1045 | """ |
| 1046 | Return the string matching the current enumeration. |
| 1047 | Return None on error. |
| 1048 | """ |
| 1049 | |
| 1050 | return nbt._bt_ctf_get_enum_str(self._d) |
| 1051 | |
| 1052 | def _get_array_element_at(self, index): |
| 1053 | """ |
| 1054 | Return the array's element at position index. |
| 1055 | Return None on error |
| 1056 | """ |
| 1057 | |
| 1058 | array_ptr = nbt._bt_python_get_array_from_def(self._d) |
| 1059 | |
| 1060 | if array_ptr is None: |
| 1061 | return None |
| 1062 | |
| 1063 | definition_ptr = nbt._bt_array_index(array_ptr, index) |
| 1064 | |
| 1065 | if definition_ptr is None: |
| 1066 | return None |
| 1067 | |
| 1068 | return _Definition(definition_ptr, self.scope) |
| 1069 | |
| 1070 | def _get_sequence_len(self): |
| 1071 | """ |
| 1072 | Return the len of a sequence or a negative |
| 1073 | value on error. |
| 1074 | """ |
| 1075 | |
| 1076 | seq = nbt._bt_python_get_sequence_from_def(self._d) |
| 1077 | |
| 1078 | return nbt._bt_sequence_len(seq) |
| 1079 | |
| 1080 | def _get_sequence_element_at(self, index): |
| 1081 | """ |
| 1082 | Return the sequence's element at position index, |
| 1083 | otherwise return None |
| 1084 | """ |
| 1085 | |
| 1086 | seq = nbt._bt_python_get_sequence_from_def(self._d) |
| 1087 | |
| 1088 | if seq is not None: |
| 1089 | definition_ptr = nbt._bt_sequence_index(seq, index) |
| 1090 | |
| 1091 | if definition_ptr is not None: |
| 1092 | return _Definition(definition_ptr, self.scope) |
| 1093 | |
| 1094 | def _get_uint64(self): |
| 1095 | """ |
| 1096 | Return the value associated with the field. |
| 1097 | If the field does not exist or is not of the type requested, |
| 1098 | the value returned is undefined. To check if an error occured, |
| 1099 | use the field_error() function after accessing a field. |
| 1100 | """ |
| 1101 | |
| 1102 | return nbt._bt_ctf_get_uint64(self._d) |
| 1103 | |
| 1104 | def _get_int64(self): |
| 1105 | """ |
| 1106 | Return the value associated with the field. |
| 1107 | If the field does not exist or is not of the type requested, |
| 1108 | the value returned is undefined. To check if an error occured, |
| 1109 | use the field_error() function after accessing a field. |
| 1110 | """ |
| 1111 | |
| 1112 | return nbt._bt_ctf_get_int64(self._d) |
| 1113 | |
| 1114 | def _get_char_array(self): |
| 1115 | """ |
| 1116 | Return the value associated with the field. |
| 1117 | If the field does not exist or is not of the type requested, |
| 1118 | the value returned is undefined. To check if an error occurred, |
| 1119 | use the field_error() function after accessing a field. |
| 1120 | """ |
| 1121 | |
| 1122 | return nbt._bt_ctf_get_char_array(self._d) |
| 1123 | |
| 1124 | def _get_str(self): |
| 1125 | """ |
| 1126 | Return the value associated with the field. |
| 1127 | If the field does not exist or is not of the type requested, |
| 1128 | the value returned is undefined. To check if an error occurred, |
| 1129 | use the field_error() function after accessing a field. |
| 1130 | """ |
| 1131 | |
| 1132 | return nbt._bt_ctf_get_string(self._d) |
| 1133 | |
| 1134 | def _get_float(self): |
| 1135 | """ |
| 1136 | Return the value associated with the field. |
| 1137 | If the field does not exist or is not of the type requested, |
| 1138 | the value returned is undefined. To check if an error occurred, |
| 1139 | use the field_error() function after accessing a field. |
| 1140 | """ |
| 1141 | |
| 1142 | return nbt._bt_ctf_get_float(self._d) |
| 1143 | |
| 1144 | def _get_variant(self): |
| 1145 | """ |
| 1146 | Return the variant's selected field. |
| 1147 | If the field does not exist or is not of the type requested, |
| 1148 | the value returned is undefined. To check if an error occurred, |
| 1149 | use the field_error() function after accessing a field. |
| 1150 | """ |
| 1151 | |
| 1152 | return nbt._bt_ctf_get_variant(self._d) |
| 1153 | |
| 1154 | def _get_struct_field_count(self): |
| 1155 | """ |
| 1156 | Return the number of fields contained in the structure. |
| 1157 | If the field does not exist or is not of the type requested, |
| 1158 | the value returned is undefined. |
| 1159 | """ |
| 1160 | |
| 1161 | return nbt._bt_ctf_get_struct_field_count(self._d) |
| 1162 | |
| 1163 | def _get_struct_field_at(self, i): |
| 1164 | """ |
| 1165 | Return the structure's field at position i. |
| 1166 | If the field does not exist or is not of the type requested, |
| 1167 | the value returned is undefined. To check if an error occurred, |
| 1168 | use the field_error() function after accessing a field. |
| 1169 | """ |
| 1170 | |
| 1171 | return nbt._bt_ctf_get_struct_field_index(self._d, i) |
| 1172 | |
| 1173 | @property |
| 1174 | def value(self): |
| 1175 | """ |
| 1176 | Return the value associated with the field according to its type. |
| 1177 | Return None on error. |
| 1178 | """ |
| 1179 | |
| 1180 | id = self.type |
| 1181 | value = None |
| 1182 | |
| 1183 | if id == common.CTFTypeId.STRING: |
| 1184 | value = self._get_str() |
| 1185 | elif id == common.CTFTypeId.ARRAY: |
| 1186 | element_decl = self.declaration.element_declaration |
| 1187 | |
| 1188 | if ((element_decl.type == common.CTFTypeId.INTEGER |
| 1189 | and element_decl.length == 8) |
| 1190 | and (element_decl.encoding == common.CTFStringEncoding.ASCII or element_decl.encoding == common.CTFStringEncoding.UTF8)): |
| 1191 | value = nbt._bt_python_get_array_string(self._d) |
| 1192 | else: |
| 1193 | value = [] |
| 1194 | |
| 1195 | for i in range(self.declaration.length): |
| 1196 | element = self._get_array_element_at(i) |
| 1197 | value.append(element.value) |
| 1198 | elif id == common.CTFTypeId.INTEGER: |
| 1199 | if self.declaration.signedness == 0: |
| 1200 | value = self._get_uint64() |
| 1201 | else: |
| 1202 | value = self._get_int64() |
| 1203 | elif id == common.CTFTypeId.ENUM: |
| 1204 | value = self._get_enum_str() |
| 1205 | elif id == common.CTFTypeId.SEQUENCE: |
| 1206 | element_decl = self.declaration.element_declaration |
| 1207 | |
| 1208 | if ((element_decl.type == common.CTFTypeId.INTEGER |
| 1209 | and element_decl.length == 8) |
| 1210 | and (element_decl.encoding == common.CTFStringEncoding.ASCII or element_decl.encoding == common.CTFStringEncoding.UTF8)): |
| 1211 | value = nbt._bt_python_get_sequence_string(self._d) |
| 1212 | else: |
| 1213 | seq_len = self._get_sequence_len() |
| 1214 | value = [] |
| 1215 | |
| 1216 | for i in range(seq_len): |
| 1217 | evDef = self._get_sequence_element_at(i) |
| 1218 | value.append(evDef.value) |
| 1219 | elif id == common.CTFTypeId.FLOAT: |
| 1220 | value = self._get_float() |
| 1221 | elif id == common.CTFTypeId.VARIANT: |
| 1222 | variant = _Definition.__new__(_Definition) |
| 1223 | variant._d = self._get_variant() |
| 1224 | value = variant.value |
| 1225 | elif id == common.CTFTypeId.STRUCT: |
| 1226 | value = {} |
| 1227 | |
| 1228 | for i in range(self._get_struct_field_count()): |
| 1229 | member = _Definition(self._get_struct_field_at(i), self.scope) |
| 1230 | value[member.name] = member.value |
| 1231 | |
| 1232 | if field_error(): |
| 1233 | raise FieldError( |
| 1234 | "Error occurred while accessing field {} of type {}".format( |
| 1235 | self.name, |
| 1236 | common.CTFTypeId.type_name(id))) |
| 1237 | |
| 1238 | return value |
| 1239 | |
| 1240 | @property |
| 1241 | def scope(self): |
| 1242 | """Return the scope of a field or None on error.""" |
| 1243 | |
| 1244 | return self._s |