lib/trace-ir/trace.c

   1 /*
   2  * trace.c
   3  *
   4  * Babeltrace trace IR - Trace
   5  *
   6  * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   7  *
   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
  29 #define BT_LOG_TAG "TRACE"
  30 #include <babeltrace/lib-logging-internal.h>
  31
  32 #include <babeltrace/assert-pre-internal.h>
  33 #include <babeltrace/trace-ir/trace-internal.h>
  34 #include <babeltrace/trace-ir/clock-class-internal.h>
  35 #include <babeltrace/trace-ir/stream-internal.h>
  36 #include <babeltrace/trace-ir/stream-class-internal.h>
  37 #include <babeltrace/trace-ir/event-internal.h>
  38 #include <babeltrace/trace-ir/event-class.h>
  39 #include <babeltrace/trace-ir/event-class-internal.h>
  40 #include <babeltrace/ctf-writer/functor-internal.h>
  41 #include <babeltrace/ctf-writer/clock-internal.h>
  42 #include <babeltrace/trace-ir/field-wrapper-internal.h>
  43 #include <babeltrace/trace-ir/field-classes-internal.h>
  44 #include <babeltrace/trace-ir/attributes-internal.h>
  45 #include <babeltrace/trace-ir/utils-internal.h>
  46 #include <babeltrace/trace-ir/resolve-field-path-internal.h>
  47 #include <babeltrace/compiler-internal.h>
  48 #include <babeltrace/values.h>
  49 #include <babeltrace/private-values.h>
  50 #include <babeltrace/values-internal.h>
  51 #include <babeltrace/object.h>
  52 #include <babeltrace/types.h>
  53 #include <babeltrace/endian-internal.h>
  54 #include <babeltrace/assert-internal.h>
  55 #include <babeltrace/compat/glib-internal.h>
  56 #include <inttypes.h>
  57 #include <stdint.h>
  58 #include <string.h>
  59 #include <stdlib.h>
  60
  61 struct bt_trace_is_static_listener_elem {
  62         bt_trace_is_static_listener func;
  63         bt_trace_listener_removed removed;
  64         void *data;
  65 };
  66
  67 #define BT_ASSERT_PRE_TRACE_HOT(_trace) \
  68         BT_ASSERT_PRE_HOT((_trace), "Trace", ": %!+t", (_trace))
  69
  70 static
  71 void destroy_trace(struct bt_object *obj)
  72 {
  73         struct bt_trace *trace = (void *) obj;
  74
  75         BT_LIB_LOGD("Destroying trace object: %!+t", trace);
  76
  77         /*
  78          * Call remove listeners first so that everything else still
  79          * exists in the trace.
  80          */
  81         if (trace->is_static_listeners) {
  82                 size_t i;
  83
  84                 for (i = 0; i < trace->is_static_listeners->len; i++) {
  85                         struct bt_trace_is_static_listener_elem elem =
  86                                 g_array_index(trace->is_static_listeners,
  87                                         struct bt_trace_is_static_listener_elem, i);
  88
  89                         if (elem.removed) {
  90                                 elem.removed(trace, elem.data);
  91                         }
  92                 }
  93
  94                 g_array_free(trace->is_static_listeners, TRUE);
  95         }
  96
  97         bt_object_pool_finalize(&trace->packet_header_field_pool);
  98
  99         if (trace->environment) {
 100                 BT_LOGD_STR("Destroying environment attributes.");
 101                 bt_attributes_destroy(trace->environment);
 102         }
 103
 104         if (trace->name.str) {
 105                 g_string_free(trace->name.str, TRUE);
 106         }
 107
 108         if (trace->streams) {
 109                 BT_LOGD_STR("Destroying streams.");
 110                 g_ptr_array_free(trace->streams, TRUE);
 111         }
 112
 113         if (trace->stream_classes) {
 114                 BT_LOGD_STR("Destroying stream classes.");
 115                 g_ptr_array_free(trace->stream_classes, TRUE);
 116         }
 117
 118         if (trace->stream_classes_stream_count) {
 119                 g_hash_table_destroy(trace->stream_classes_stream_count);
 120         }
 121
 122         BT_LOGD_STR("Putting packet header field classe.");
 123         bt_object_put_ref(trace->packet_header_fc);
 124         g_free(trace);
 125 }
 126
 127 static
 128 void free_packet_header_field(struct bt_field_wrapper *field_wrapper,
 129                 struct bt_trace *trace)
 130 {
 131         bt_field_wrapper_destroy(field_wrapper);
 132 }
 133
 134 struct bt_trace *bt_trace_create(void)
 135 {
 136         struct bt_trace *trace = NULL;
 137         int ret;
 138
 139         BT_LOGD_STR("Creating default trace object.");
 140         trace = g_new0(struct bt_trace, 1);
 141         if (!trace) {
 142                 BT_LOGE_STR("Failed to allocate one trace.");
 143                 goto error;
 144         }
 145
 146         bt_object_init_shared_with_parent(&trace->base, destroy_trace);
 147         trace->streams = g_ptr_array_new_with_free_func(
 148                 (GDestroyNotify) bt_object_try_spec_release);
 149         if (!trace->streams) {
 150                 BT_LOGE_STR("Failed to allocate one GPtrArray.");
 151                 goto error;
 152         }
 153
 154         trace->stream_classes = g_ptr_array_new_with_free_func(
 155                 (GDestroyNotify) bt_object_try_spec_release);
 156         if (!trace->stream_classes) {
 157                 BT_LOGE_STR("Failed to allocate one GPtrArray.");
 158                 goto error;
 159         }
 160
 161         trace->stream_classes_stream_count = g_hash_table_new(g_direct_hash,
 162                 g_direct_equal);
 163         if (!trace->stream_classes_stream_count) {
 164                 BT_LOGE_STR("Failed to allocate one GHashTable.");
 165                 goto error;
 166         }
 167
 168         trace->name.str = g_string_new(NULL);
 169         if (!trace->name.str) {
 170                 BT_LOGE_STR("Failed to allocate one GString.");
 171                 goto error;
 172         }
 173
 174         trace->environment = bt_attributes_create();
 175         if (!trace->environment) {
 176                 BT_LOGE_STR("Cannot create empty attributes object.");
 177                 goto error;
 178         }
 179
 180         trace->is_static_listeners = g_array_new(FALSE, TRUE,
 181                 sizeof(struct bt_trace_is_static_listener_elem));
 182         if (!trace->is_static_listeners) {
 183                 BT_LOGE_STR("Failed to allocate one GArray.");
 184                 goto error;
 185         }
 186
 187         trace->assigns_automatic_stream_class_id = true;
 188         ret = bt_object_pool_initialize(&trace->packet_header_field_pool,
 189                 (bt_object_pool_new_object_func) bt_field_wrapper_new,
 190                 (bt_object_pool_destroy_object_func) free_packet_header_field,
 191                 trace);
 192         if (ret) {
 193                 BT_LOGE("Failed to initialize packet header field pool: ret=%d",
 194                         ret);
 195                 goto error;
 196         }
 197
 198         BT_LIB_LOGD("Created trace object: %!+t", trace);
 199         goto end;
 200
 201 error:
 202         BT_OBJECT_PUT_REF_AND_RESET(trace);
 203
 204 end:
 205         return trace;
 206 }
 207
 208 const char *bt_trace_get_name(struct bt_trace *trace)
 209 {
 210         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 211         return trace->name.value;
 212 }
 213
 214 int bt_trace_set_name(struct bt_trace *trace, const char *name)
 215 {
 216         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 217         BT_ASSERT_PRE_NON_NULL(name, "Name");
 218         BT_ASSERT_PRE_TRACE_HOT(trace);
 219         g_string_assign(trace->name.str, name);
 220         trace->name.value = trace->name.str->str;
 221         BT_LIB_LOGV("Set trace's name: %!+t", trace);
 222         return 0;
 223 }
 224
 225 bt_uuid bt_trace_get_uuid(struct bt_trace *trace)
 226 {
 227         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 228         return trace->uuid.value;
 229 }
 230
 231 int bt_trace_set_uuid(struct bt_trace *trace, bt_uuid uuid)
 232 {
 233         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 234         BT_ASSERT_PRE_NON_NULL(uuid, "UUID");
 235         BT_ASSERT_PRE_TRACE_HOT(trace);
 236         memcpy(trace->uuid.uuid, uuid, BABELTRACE_UUID_LEN);
 237         trace->uuid.value = trace->uuid.uuid;
 238         BT_LIB_LOGV("Set trace's UUID: %!+t", trace);
 239         return 0;
 240 }
 241
 242 BT_ASSERT_FUNC
 243 static
 244 bool trace_has_environment_entry(struct bt_trace *trace, const char *name)
 245 {
 246         BT_ASSERT(trace);
 247
 248         return bt_attributes_borrow_field_value_by_name(
 249                 trace->environment, name) != NULL;
 250 }
 251
 252 static
 253 int set_environment_entry(struct bt_trace *trace, const char *name,
 254                 struct bt_private_value *value)
 255 {
 256         int ret;
 257
 258         BT_ASSERT(trace);
 259         BT_ASSERT(name);
 260         BT_ASSERT(value);
 261         BT_ASSERT_PRE(!trace->frozen ||
 262                 !trace_has_environment_entry(trace, name),
 263                 "Trace is frozen: cannot replace environment entry: "
 264                 "%![trace-]+t, entry-name=\"%s\"", trace, name);
 265         ret = bt_attributes_set_field_value(trace->environment, name,
 266                 value);
 267         bt_value_freeze(bt_value_borrow_from_private(value));
 268         if (ret) {
 269                 BT_LIB_LOGE("Cannot set trace's environment entry: "
 270                         "%![trace-]+t, entry-name=\"%s\"", trace, name);
 271         } else {
 272                 BT_LIB_LOGV("Set trace's environment entry: "
 273                         "%![trace-]+t, entry-name=\"%s\"", trace, name);
 274         }
 275
 276         return ret;
 277 }
 278
 279 int bt_trace_set_environment_entry_string(struct bt_trace *trace,
 280                 const char *name, const char *value)
 281 {
 282         int ret;
 283         struct bt_private_value *value_obj;
 284
 285         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 286         BT_ASSERT_PRE_NON_NULL(name, "Name");
 287         BT_ASSERT_PRE_NON_NULL(value, "Value");
 288         value_obj = bt_private_value_string_create_init(value);
 289         if (!value_obj) {
 290                 BT_LOGE_STR("Cannot create a string value object.");
 291                 ret = -1;
 292                 goto end;
 293         }
 294
 295         /* set_environment_entry() logs errors */
 296         ret = set_environment_entry(trace, name, value_obj);
 297
 298 end:
 299         bt_object_put_ref(value_obj);
 300         return ret;
 301 }
 302
 303 int bt_trace_set_environment_entry_integer(
 304                 struct bt_trace *trace, const char *name, int64_t value)
 305 {
 306         int ret;
 307         struct bt_private_value *value_obj;
 308
 309         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 310         BT_ASSERT_PRE_NON_NULL(name, "Name");
 311         value_obj = bt_private_value_integer_create_init(value);
 312         if (!value_obj) {
 313                 BT_LOGE_STR("Cannot create an integer value object.");
 314                 ret = -1;
 315                 goto end;
 316         }
 317
 318         /* set_environment_entry() logs errors */
 319         ret = set_environment_entry(trace, name, value_obj);
 320
 321 end:
 322         bt_object_put_ref(value_obj);
 323         return ret;
 324 }
 325
 326 uint64_t bt_trace_get_environment_entry_count(struct bt_trace *trace)
 327 {
 328         int64_t ret;
 329
 330         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 331         ret = bt_attributes_get_count(trace->environment);
 332         BT_ASSERT(ret >= 0);
 333         return (uint64_t) ret;
 334 }
 335
 336 void bt_trace_borrow_environment_entry_by_index(
 337                 struct bt_trace *trace, uint64_t index,
 338                 const char **name, struct bt_value **value)
 339 {
 340         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 341         BT_ASSERT_PRE_NON_NULL(name, "Name");
 342         BT_ASSERT_PRE_NON_NULL(value, "Value");
 343         BT_ASSERT_PRE_VALID_INDEX(index,
 344                 bt_attributes_get_count(trace->environment));
 345         *value = bt_value_borrow_from_private(
 346                 bt_attributes_borrow_field_value(trace->environment, index));
 347         BT_ASSERT(*value);
 348         *name = bt_attributes_get_field_name(trace->environment, index);
 349         BT_ASSERT(*name);
 350 }
 351
 352 struct bt_value *bt_trace_borrow_environment_entry_value_by_name(
 353                 struct bt_trace *trace, const char *name)
 354 {
 355         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 356         BT_ASSERT_PRE_NON_NULL(name, "Name");
 357         return bt_value_borrow_from_private(
 358                 bt_attributes_borrow_field_value_by_name(trace->environment,
 359                         name));
 360 }
 361
 362 uint64_t bt_trace_get_stream_count(struct bt_trace *trace)
 363 {
 364         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 365         return (uint64_t) trace->streams->len;
 366 }
 367
 368 struct bt_stream *bt_trace_borrow_stream_by_index(
 369                 struct bt_trace *trace, uint64_t index)
 370 {
 371         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 372         BT_ASSERT_PRE_VALID_INDEX(index, trace->streams->len);
 373         return g_ptr_array_index(trace->streams, index);
 374 }
 375
 376 struct bt_stream *bt_trace_borrow_stream_by_id(
 377                 struct bt_trace *trace, uint64_t id)
 378 {
 379         struct bt_stream *stream = NULL;
 380         uint64_t i;
 381
 382         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 383
 384         for (i = 0; i < trace->streams->len; i++) {
 385                 struct bt_stream *stream_candidate =
 386                         g_ptr_array_index(trace->streams, i);
 387
 388                 if (stream_candidate->id == id) {
 389                         stream = stream_candidate;
 390                         goto end;
 391                 }
 392         }
 393
 394 end:
 395         return stream;
 396 }
 397
 398 uint64_t bt_trace_get_stream_class_count(struct bt_trace *trace)
 399 {
 400         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 401         return (uint64_t) trace->stream_classes->len;
 402 }
 403
 404 struct bt_stream_class *bt_trace_borrow_stream_class_by_index(
 405                 struct bt_trace *trace, uint64_t index)
 406 {
 407         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 408         BT_ASSERT_PRE_VALID_INDEX(index, trace->stream_classes->len);
 409         return g_ptr_array_index(trace->stream_classes, index);
 410 }
 411
 412 struct bt_stream_class *bt_trace_borrow_stream_class_by_id(
 413                 struct bt_trace *trace, uint64_t id)
 414 {
 415         struct bt_stream_class *stream_class = NULL;
 416         uint64_t i;
 417
 418         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 419
 420         for (i = 0; i < trace->stream_classes->len; i++) {
 421                 struct bt_stream_class *stream_class_candidate =
 422                         g_ptr_array_index(trace->stream_classes, i);
 423
 424                 if (stream_class_candidate->id == id) {
 425                         stream_class = stream_class_candidate;
 426                         goto end;
 427                 }
 428         }
 429
 430 end:
 431         return stream_class;
 432 }
 433
 434 struct bt_field_class *bt_trace_borrow_packet_header_field_class(
 435                 struct bt_trace *trace)
 436 {
 437         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 438         return trace->packet_header_fc;
 439 }
 440
 441 int bt_trace_set_packet_header_field_class(struct bt_trace *trace,
 442                 struct bt_field_class *field_class)
 443 {
 444         int ret;
 445         struct bt_resolve_field_path_context resolve_ctx = {
 446                 .packet_header = field_class,
 447                 .packet_context = NULL,
 448                 .event_header = NULL,
 449                 .event_common_context = NULL,
 450                 .event_specific_context = NULL,
 451                 .event_payload = NULL,
 452         };
 453
 454         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 455         BT_ASSERT_PRE_NON_NULL(field_class, "Field class");
 456         BT_ASSERT_PRE_TRACE_HOT(trace);
 457         BT_ASSERT_PRE(bt_field_class_get_type(field_class) ==
 458                 BT_FIELD_CLASS_TYPE_STRUCTURE,
 459                 "Packet header field classe is not a structure field classe: %!+F",
 460                 field_class);
 461         ret = bt_resolve_field_paths(field_class, &resolve_ctx);
 462         if (ret) {
 463                 goto end;
 464         }
 465
 466         bt_field_class_make_part_of_trace(field_class);
 467         bt_object_put_ref(trace->packet_header_fc);
 468         trace->packet_header_fc = bt_object_get_ref(field_class);
 469         bt_field_class_freeze(field_class);
 470         BT_LIB_LOGV("Set trace's packet header field classe: %!+t", trace);
 471
 472 end:
 473         return ret;
 474 }
 475
 476 bt_bool bt_trace_is_static(struct bt_trace *trace)
 477 {
 478         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 479         return (bt_bool) trace->is_static;
 480 }
 481
 482 int bt_trace_make_static(struct bt_trace *trace)
 483 {
 484         uint64_t i;
 485
 486         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 487         trace->is_static = true;
 488         bt_trace_freeze(trace);
 489         BT_LIB_LOGV("Trace is now static: %!+t", trace);
 490
 491         /* Call all the "trace is static" listeners */
 492         for (i = 0; i < trace->is_static_listeners->len; i++) {
 493                 struct bt_trace_is_static_listener_elem elem =
 494                         g_array_index(trace->is_static_listeners,
 495                                 struct bt_trace_is_static_listener_elem, i);
 496
 497                 if (elem.func) {
 498                         elem.func(trace, elem.data);
 499                 }
 500         }
 501
 502         return 0;
 503 }
 504
 505 int bt_trace_add_is_static_listener(struct bt_trace *trace,
 506                 bt_trace_is_static_listener listener,
 507                 bt_trace_listener_removed listener_removed, void *data,
 508                 uint64_t *listener_id)
 509 {
 510         uint64_t i;
 511         struct bt_trace_is_static_listener_elem new_elem = {
 512                 .func = listener,
 513                 .removed = listener_removed,
 514                 .data = data,
 515         };
 516
 517         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 518         BT_ASSERT_PRE_NON_NULL(listener, "Listener");
 519         BT_ASSERT_PRE(!trace->is_static,
 520                 "Trace is already static: %!+t", trace);
 521         BT_ASSERT_PRE(trace->in_remove_listener,
 522                 "Cannot call this function while executing a "
 523                 "remove listener: %!+t", trace);
 524
 525         /* Find the next available spot */
 526         for (i = 0; i < trace->is_static_listeners->len; i++) {
 527                 struct bt_trace_is_static_listener_elem elem =
 528                         g_array_index(trace->is_static_listeners,
 529                                 struct bt_trace_is_static_listener_elem, i);
 530
 531                 if (!elem.func) {
 532                         break;
 533                 }
 534         }
 535
 536         if (i == trace->is_static_listeners->len) {
 537                 g_array_append_val(trace->is_static_listeners, new_elem);
 538         } else {
 539                 g_array_insert_val(trace->is_static_listeners, i, new_elem);
 540         }
 541
 542         if (listener_id) {
 543                 *listener_id = i;
 544         }
 545
 546         BT_LIB_LOGV("Added \"trace is static\" listener: "
 547                 "%![trace-]+t, listener-id=%" PRIu64, trace, i);
 548         return 0;
 549 }
 550
 551 BT_ASSERT_PRE_FUNC
 552 static
 553 bool has_listener_id(struct bt_trace *trace, uint64_t listener_id)
 554 {
 555         BT_ASSERT(listener_id < trace->is_static_listeners->len);
 556         return (&g_array_index(trace->is_static_listeners,
 557                         struct bt_trace_is_static_listener_elem,
 558                         listener_id))->func != NULL;
 559 }
 560
 561 int bt_trace_remove_is_static_listener(
 562                 struct bt_trace *trace, uint64_t listener_id)
 563 {
 564         struct bt_trace_is_static_listener_elem *elem;
 565
 566         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 567         BT_ASSERT_PRE(!trace->is_static,
 568                 "Trace is already static: %!+t", trace);
 569         BT_ASSERT_PRE(trace->in_remove_listener,
 570                 "Cannot call this function while executing a "
 571                 "remove listener: %!+t", trace);
 572         BT_ASSERT_PRE(has_listener_id(trace, listener_id),
 573                 "Trace has no such \"trace is static\" listener ID: "
 574                 "%![trace-]+t, %" PRIu64, trace, listener_id);
 575         elem = &g_array_index(trace->is_static_listeners,
 576                         struct bt_trace_is_static_listener_elem,
 577                         listener_id);
 578         BT_ASSERT(elem->func);
 579
 580         if (elem->removed) {
 581                 /* Call remove listener */
 582                 BT_LIB_LOGV("Calling remove listener: "
 583                         "%![trace-]+t, listener-id=%" PRIu64,
 584                         trace, listener_id);
 585                 trace->in_remove_listener = true;
 586                 elem->removed(trace, elem->data);
 587                 trace->in_remove_listener = false;
 588         }
 589
 590         elem->func = NULL;
 591         elem->removed = NULL;
 592         elem->data = NULL;
 593         BT_LIB_LOGV("Removed \"trace is static\" listener: "
 594                 "%![trace-]+t, listener-id=%" PRIu64,
 595                 trace, listener_id);
 596         return 0;
 597 }
 598
 599 BT_HIDDEN
 600 void _bt_trace_freeze(struct bt_trace *trace)
 601 {
 602         /* The packet header field classe is already frozen */
 603         BT_ASSERT(trace);
 604         BT_LIB_LOGD("Freezing trace: %!+t", trace);
 605         trace->frozen = true;
 606 }
 607
 608 bt_bool bt_trace_assigns_automatic_stream_class_id(struct bt_trace *trace)
 609 {
 610         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 611         return (bt_bool) trace->assigns_automatic_stream_class_id;
 612 }
 613
 614 int bt_trace_set_assigns_automatic_stream_class_id(
 615                 struct bt_trace *trace, bt_bool value)
 616 {
 617         BT_ASSERT_PRE_NON_NULL(trace, "Trace");
 618         BT_ASSERT_PRE_TRACE_HOT(trace);
 619         trace->assigns_automatic_stream_class_id = (bool) value;
 620         BT_LIB_LOGV("Set trace's automatic stream class ID "
 621                 "assignment property: %!+t", trace);
 622         return 0;
 623 }
 624
 625 BT_HIDDEN
 626 void bt_trace_add_stream(struct bt_trace *trace, struct bt_stream *stream)
 627 {
 628         guint count = 0;
 629
 630         bt_object_set_parent(&stream->base, &trace->base);
 631         g_ptr_array_add(trace->streams, stream);
 632         bt_trace_freeze(trace);
 633
 634         if (bt_g_hash_table_contains(trace->stream_classes_stream_count,
 635                         stream->class)) {
 636                 count = GPOINTER_TO_UINT(g_hash_table_lookup(
 637                         trace->stream_classes_stream_count, stream->class));
 638         }
 639
 640         g_hash_table_insert(trace->stream_classes_stream_count,
 641                 stream->class, GUINT_TO_POINTER(count + 1));
 642 }
 643
 644 BT_HIDDEN
 645 uint64_t bt_trace_get_automatic_stream_id(struct bt_trace *trace,
 646                 struct bt_stream_class *stream_class)
 647 {
 648         gpointer orig_key;
 649         gpointer value;
 650         uint64_t id = 0;
 651
 652         BT_ASSERT(stream_class);
 653         BT_ASSERT(trace);
 654         if (g_hash_table_lookup_extended(trace->stream_classes_stream_count,
 655                         stream_class, &orig_key, &value)) {
 656                 id = (uint64_t) GPOINTER_TO_UINT(value);
 657         }
 658
 659         return id;
 660 }