src/lib/trace-ir/event-class.c

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
   5  * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   6  */
   7
   8 #define BT_LOG_TAG "LIB/EVENT-CLASS"
   9 #include "lib/logging.h"
  10
  11 #include "lib/assert-cond.h"
  12 #include <babeltrace2/trace-ir/field-class.h>
  13 #include <babeltrace2/trace-ir/event-class.h>
  14 #include <babeltrace2/trace-ir/stream-class.h>
  15 #include "compat/compiler.h"
  16 #include "compat/endian.h"
  17 #include <babeltrace2/types.h>
  18 #include "lib/value.h"
  19 #include "common/assert.h"
  20 #include <inttypes.h>
  21 #include <stdbool.h>
  22 #include <stdlib.h>
  23
  24 #include "attributes.h"
  25 #include "clock-snapshot.h"
  26 #include "event-class.h"
  27 #include "event.h"
  28 #include "field-class.h"
  29 #include "field.h"
  30 #include "resolve-field-path.h"
  31 #include "stream-class.h"
  32 #include "trace.h"
  33 #include "utils.h"
  34 #include "lib/func-status.h"
  35
  36 #define BT_ASSERT_PRE_DEV_EVENT_CLASS_HOT(_ec)                          \
  37         BT_ASSERT_PRE_DEV_HOT(((const struct bt_event_class *) (_ec)),  \
  38                 "Event class", ": %!+E", (_ec))
  39
  40 static
  41 void destroy_event_class(struct bt_object *obj)
  42 {
  43         struct bt_event_class *event_class = (void *) obj;
  44
  45         BT_LIB_LOGD("Destroying event class: %!+E", event_class);
  46         BT_OBJECT_PUT_REF_AND_RESET(event_class->user_attributes);
  47
  48         if (event_class->name.str) {
  49                 g_string_free(event_class->name.str, TRUE);
  50                 event_class->name.str = NULL;
  51         }
  52
  53         if (event_class->emf_uri.str) {
  54                 g_string_free(event_class->emf_uri.str, TRUE);
  55                 event_class->emf_uri.str = NULL;
  56         }
  57
  58         BT_LOGD_STR("Putting context field class.");
  59         BT_OBJECT_PUT_REF_AND_RESET(event_class->specific_context_fc);
  60         BT_LOGD_STR("Putting payload field class.");
  61         BT_OBJECT_PUT_REF_AND_RESET(event_class->payload_fc);
  62         bt_object_pool_finalize(&event_class->event_pool);
  63         g_free(obj);
  64 }
  65
  66 static
  67 void free_event(struct bt_event *event,
  68                 struct bt_event_class *event_class)
  69 {
  70         bt_event_destroy(event);
  71 }
  72
  73 static
  74 bool event_class_id_is_unique(const struct bt_stream_class *stream_class,
  75                 uint64_t id)
  76 {
  77         uint64_t i;
  78         bool is_unique = true;
  79
  80         for (i = 0; i < stream_class->event_classes->len; i++) {
  81                 const struct bt_event_class *ec =
  82                         stream_class->event_classes->pdata[i];
  83
  84                 if (ec->id == id) {
  85                         is_unique = false;
  86                         goto end;
  87                 }
  88         }
  89
  90 end:
  91         return is_unique;
  92 }
  93
  94 static
  95 struct bt_event_class *create_event_class_with_id(
  96                 struct bt_stream_class *stream_class, uint64_t id)
  97 {
  98         int ret;
  99         struct bt_event_class *event_class;
 100
 101         BT_ASSERT(stream_class);
 102         BT_ASSERT_PRE(event_class_id_is_unique(stream_class, id),
 103                 "Duplicate event class ID: %![sc-]+S, id=%" PRIu64,
 104                 stream_class, id);
 105         BT_LIB_LOGD("Creating event class object: %![sc-]+S, id=%" PRIu64,
 106                 stream_class, id);
 107         event_class = g_new0(struct bt_event_class, 1);
 108         if (!event_class) {
 109                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate one event class.");
 110                 goto error;
 111         }
 112
 113         bt_object_init_shared_with_parent(&event_class->base,
 114                 destroy_event_class);
 115         event_class->user_attributes = bt_value_map_create();
 116         if (!event_class->user_attributes) {
 117                 BT_LIB_LOGE_APPEND_CAUSE(
 118                         "Failed to create a map value object.");
 119                 goto error;
 120         }
 121
 122         event_class->id = id;
 123         bt_property_uint_init(&event_class->log_level,
 124                         BT_PROPERTY_AVAILABILITY_NOT_AVAILABLE, 0);
 125         event_class->name.str = g_string_new(NULL);
 126         if (!event_class->name.str) {
 127                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate a GString.");
 128                 goto error;
 129         }
 130
 131         event_class->emf_uri.str = g_string_new(NULL);
 132         if (!event_class->emf_uri.str) {
 133                 BT_LIB_LOGE_APPEND_CAUSE("Failed to allocate a GString.");
 134                 goto error;
 135         }
 136
 137         ret = bt_object_pool_initialize(&event_class->event_pool,
 138                 (bt_object_pool_new_object_func) bt_event_new,
 139                 (bt_object_pool_destroy_object_func) free_event,
 140                 event_class);
 141         if (ret) {
 142                 BT_LIB_LOGE_APPEND_CAUSE(
 143                         "Failed to initialize event pool: ret=%d",
 144                         ret);
 145                 goto error;
 146         }
 147
 148         bt_object_set_parent(&event_class->base, &stream_class->base);
 149         g_ptr_array_add(stream_class->event_classes, event_class);
 150         bt_stream_class_freeze(stream_class);
 151         BT_LIB_LOGD("Created event class object: %!+E", event_class);
 152         goto end;
 153
 154 error:
 155         BT_OBJECT_PUT_REF_AND_RESET(event_class);
 156
 157 end:
 158         return event_class;
 159 }
 160
 161 struct bt_event_class *bt_event_class_create(
 162                 struct bt_stream_class *stream_class)
 163 {
 164         BT_ASSERT_PRE_NO_ERROR();
 165         BT_ASSERT_PRE_SC_NON_NULL(stream_class);
 166         BT_ASSERT_PRE(stream_class->assigns_automatic_event_class_id,
 167                 "Stream class does not automatically assigns event class IDs: "
 168                 "%![sc-]+S", stream_class);
 169         return create_event_class_with_id(stream_class,
 170                 (uint64_t) stream_class->event_classes->len);
 171 }
 172
 173 struct bt_event_class *bt_event_class_create_with_id(
 174                 struct bt_stream_class *stream_class, uint64_t id)
 175 {
 176         BT_ASSERT_PRE_NO_ERROR();
 177         BT_ASSERT_PRE(!stream_class->assigns_automatic_event_class_id,
 178                 "Stream class automatically assigns event class IDs: "
 179                 "%![sc-]+S", stream_class);
 180         return create_event_class_with_id(stream_class, id);
 181 }
 182
 183 const char *bt_event_class_get_name(const struct bt_event_class *event_class)
 184 {
 185         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 186         return event_class->name.value;
 187 }
 188
 189 enum bt_event_class_set_name_status bt_event_class_set_name(
 190                 struct bt_event_class *event_class, const char *name)
 191 {
 192         BT_ASSERT_PRE_NO_ERROR();
 193         BT_ASSERT_PRE_EC_NON_NULL(event_class);
 194         BT_ASSERT_PRE_NAME_NON_NULL(name);
 195         BT_ASSERT_PRE_DEV_EVENT_CLASS_HOT(event_class);
 196         g_string_assign(event_class->name.str, name);
 197         event_class->name.value = event_class->name.str->str;
 198         BT_LIB_LOGD("Set event class's name: %!+E", event_class);
 199         return BT_FUNC_STATUS_OK;
 200 }
 201
 202 uint64_t bt_event_class_get_id(const struct bt_event_class *event_class)
 203 {
 204         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 205         return event_class->id;
 206 }
 207
 208 enum bt_property_availability bt_event_class_get_log_level(
 209                 const struct bt_event_class *event_class,
 210                 enum bt_event_class_log_level *log_level)
 211 {
 212         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 213         BT_ASSERT_PRE_DEV_NON_NULL(log_level, "Log level (output)");
 214         *log_level = (enum bt_event_class_log_level)
 215                 event_class->log_level.value;
 216         return event_class->log_level.base.avail;
 217 }
 218
 219 void bt_event_class_set_log_level(
 220                 struct bt_event_class *event_class,
 221                 enum bt_event_class_log_level log_level)
 222 {
 223         BT_ASSERT_PRE_EC_NON_NULL(event_class);
 224         BT_ASSERT_PRE_DEV_EVENT_CLASS_HOT(event_class);
 225         bt_property_uint_set(&event_class->log_level,
 226                 (uint64_t) log_level);
 227         BT_LIB_LOGD("Set event class's log level: %!+E", event_class);
 228 }
 229
 230 const char *bt_event_class_get_emf_uri(const struct bt_event_class *event_class)
 231 {
 232         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 233         return event_class->emf_uri.value;
 234 }
 235
 236 enum bt_event_class_set_emf_uri_status bt_event_class_set_emf_uri(
 237                 struct bt_event_class *event_class,
 238                 const char *emf_uri)
 239 {
 240         BT_ASSERT_PRE_NO_ERROR();
 241         BT_ASSERT_PRE_EC_NON_NULL(event_class);
 242         BT_ASSERT_PRE_NON_NULL(emf_uri, "EMF URI");
 243         BT_ASSERT_PRE_DEV_EVENT_CLASS_HOT(event_class);
 244         g_string_assign(event_class->emf_uri.str, emf_uri);
 245         event_class->emf_uri.value = event_class->emf_uri.str->str;
 246         BT_LIB_LOGD("Set event class's EMF URI: %!+E", event_class);
 247         return BT_FUNC_STATUS_OK;
 248 }
 249
 250 struct bt_stream_class *bt_event_class_borrow_stream_class(
 251                 struct bt_event_class *event_class)
 252 {
 253         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 254         return bt_event_class_borrow_stream_class_inline(event_class);
 255 }
 256
 257 const struct bt_stream_class *
 258 bt_event_class_borrow_stream_class_const(
 259                 const struct bt_event_class *event_class)
 260 {
 261         return bt_event_class_borrow_stream_class((void *) event_class);
 262 }
 263
 264 const struct bt_field_class *
 265 bt_event_class_borrow_specific_context_field_class_const(
 266                 const struct bt_event_class *event_class)
 267 {
 268         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 269         return event_class->specific_context_fc;
 270 }
 271
 272 struct bt_field_class *
 273 bt_event_class_borrow_specific_context_field_class(
 274                 struct bt_event_class *event_class)
 275 {
 276         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 277         return event_class->specific_context_fc;
 278 }
 279
 280 enum bt_event_class_set_field_class_status
 281 bt_event_class_set_specific_context_field_class(
 282                 struct bt_event_class *event_class,
 283                 struct bt_field_class *field_class)
 284 {
 285         int ret;
 286         struct bt_stream_class *stream_class;
 287         struct bt_resolve_field_path_context resolve_ctx = {
 288                 .packet_context = NULL,
 289                 .event_common_context = NULL,
 290                 .event_specific_context = field_class,
 291                 .event_payload = NULL,
 292         };
 293
 294         BT_ASSERT_PRE_NO_ERROR();
 295         BT_ASSERT_PRE_EC_NON_NULL(event_class);
 296         BT_ASSERT_PRE_FC_NON_NULL(field_class);
 297         BT_ASSERT_PRE_DEV_EVENT_CLASS_HOT(event_class);
 298         BT_ASSERT_PRE_FC_IS_STRUCT(field_class, "Specific context field class");
 299         stream_class = bt_event_class_borrow_stream_class_inline(
 300                 event_class);
 301         resolve_ctx.packet_context = stream_class->packet_context_fc;
 302         resolve_ctx.event_common_context =
 303                 stream_class->event_common_context_fc;
 304
 305         ret = bt_resolve_field_paths(field_class, &resolve_ctx);
 306         if (ret) {
 307                 /*
 308                  * This is the only reason for which
 309                  * bt_resolve_field_paths() can fail: anything else
 310                  * would be because a precondition is not satisfied.
 311                  */
 312                 ret = BT_FUNC_STATUS_MEMORY_ERROR;
 313                 goto end;
 314         }
 315
 316         bt_field_class_make_part_of_trace_class(field_class);
 317         bt_object_put_ref(event_class->specific_context_fc);
 318         event_class->specific_context_fc = field_class;
 319         bt_object_get_ref_no_null_check(event_class->specific_context_fc);
 320         bt_field_class_freeze(field_class);
 321         BT_LIB_LOGD("Set event class's specific context field class: %!+E",
 322                 event_class);
 323
 324 end:
 325         return ret;
 326 }
 327
 328 const struct bt_field_class *bt_event_class_borrow_payload_field_class_const(
 329                 const struct bt_event_class *event_class)
 330 {
 331         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 332         return event_class->payload_fc;
 333 }
 334
 335 struct bt_field_class *bt_event_class_borrow_payload_field_class(
 336                 struct bt_event_class *event_class)
 337 {
 338         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 339         return event_class->payload_fc;
 340 }
 341
 342 enum bt_event_class_set_field_class_status
 343 bt_event_class_set_payload_field_class(
 344                 struct bt_event_class *event_class,
 345                 struct bt_field_class *field_class)
 346 {
 347         int ret;
 348         struct bt_stream_class *stream_class;
 349         struct bt_resolve_field_path_context resolve_ctx = {
 350                 .packet_context = NULL,
 351                 .event_common_context = NULL,
 352                 .event_specific_context = NULL,
 353                 .event_payload = field_class,
 354         };
 355
 356         BT_ASSERT_PRE_NO_ERROR();
 357         BT_ASSERT_PRE_EC_NON_NULL(event_class);
 358         BT_ASSERT_PRE_FC_NON_NULL(field_class);
 359         BT_ASSERT_PRE_DEV_EVENT_CLASS_HOT(event_class);
 360         BT_ASSERT_PRE_FC_IS_STRUCT(field_class, "Payload field class");
 361         stream_class = bt_event_class_borrow_stream_class_inline(
 362                 event_class);
 363         resolve_ctx.packet_context = stream_class->packet_context_fc;
 364         resolve_ctx.event_common_context =
 365                 stream_class->event_common_context_fc;
 366         resolve_ctx.event_specific_context = event_class->specific_context_fc;
 367
 368         ret = bt_resolve_field_paths(field_class, &resolve_ctx);
 369         if (ret) {
 370                 /*
 371                  * This is the only reason for which
 372                  * bt_resolve_field_paths() can fail: anything else
 373                  * would be because a precondition is not satisfied.
 374                  */
 375                 ret = BT_FUNC_STATUS_MEMORY_ERROR;
 376                 goto end;
 377         }
 378
 379         bt_field_class_make_part_of_trace_class(field_class);
 380         bt_object_put_ref(event_class->payload_fc);
 381         event_class->payload_fc = field_class;
 382         bt_object_get_ref_no_null_check(event_class->payload_fc);
 383         bt_field_class_freeze(field_class);
 384         BT_LIB_LOGD("Set event class's payload field class: %!+E", event_class);
 385
 386 end:
 387         return ret;
 388 }
 389
 390 BT_HIDDEN
 391 void _bt_event_class_freeze(const struct bt_event_class *event_class)
 392 {
 393         /* The field classes are already frozen */
 394         BT_ASSERT(event_class);
 395         BT_LIB_LOGD("Freezing event class's user attributes: %!+v",
 396                 event_class->user_attributes);
 397         bt_value_freeze(event_class->user_attributes);
 398         BT_LIB_LOGD("Freezing event class: %!+E", event_class);
 399         ((struct bt_event_class *) event_class)->frozen = true;
 400 }
 401
 402 const struct bt_value *bt_event_class_borrow_user_attributes_const(
 403                 const struct bt_event_class *event_class)
 404 {
 405         BT_ASSERT_PRE_DEV_EC_NON_NULL(event_class);
 406         return event_class->user_attributes;
 407 }
 408
 409 struct bt_value *bt_event_class_borrow_user_attributes(
 410                 struct bt_event_class *event_class)
 411 {
 412         return (void *) bt_event_class_borrow_user_attributes_const(
 413                 (void *) event_class);
 414 }
 415
 416 void bt_event_class_set_user_attributes(
 417                 struct bt_event_class *event_class,
 418                 const struct bt_value *user_attributes)
 419 {
 420         BT_ASSERT_PRE_EC_NON_NULL(event_class);
 421         BT_ASSERT_PRE_DEV_EVENT_CLASS_HOT(event_class);
 422         BT_ASSERT_PRE_USER_ATTRS_NON_NULL(user_attributes);
 423         BT_ASSERT_PRE_USER_ATTRS_IS_MAP(user_attributes);
 424         bt_object_put_ref_no_null_check(event_class->user_attributes);
 425         event_class->user_attributes = (void *) user_attributes;
 426         bt_object_get_ref_no_null_check(event_class->user_attributes);
 427 }
 428
 429 void bt_event_class_get_ref(const struct bt_event_class *event_class)
 430 {
 431         bt_object_get_ref(event_class);
 432 }
 433
 434 void bt_event_class_put_ref(const struct bt_event_class *event_class)
 435 {
 436         bt_object_put_ref(event_class);
 437 }