src/plugins/lttng-utils/debug-info/trace-ir-metadata-copy.c

   1 /*
   2  * Babeltrace - Trace IR metadata object copy
   3  *
   4  * Copyright (c) 2015 EfficiOS Inc. and Linux Foundation
   5  * Copyright (c) 2018 Philippe Proulx <pproulx@efficios.com>
   6  * Copyright (c) 2019 Francis Deslauriers <francis.deslauriers@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  */
  26
  27 #define BT_COMP_LOG_SELF_COMP self_comp
  28 #define BT_LOG_OUTPUT_LEVEL log_level
  29 #define BT_LOG_TAG "PLUGIN/FLT.LTTNG-UTILS.DEBUG-INFO/TRACE-IR-META-COPY"
  30 #include "plugins/comp-logging.h"
  31
  32 #include <inttypes.h>
  33 #include <stdint.h>
  34
  35 #include "common/assert.h"
  36
  37 #include "trace-ir-metadata-copy.h"
  38 #include "trace-ir-metadata-field-class-copy.h"
  39 #include "utils.h"
  40
  41 BT_HIDDEN
  42 int copy_trace_class_content(const bt_trace_class *in_trace_class,
  43                 bt_trace_class *out_trace_class, bt_logging_level log_level,
  44                 bt_self_component *self_comp)
  45 {
  46         BT_COMP_LOGD("Copying content of trace class: in-tc-addr=%p, out-tc-addr=%p",
  47                         in_trace_class, out_trace_class);
  48
  49         /* Use the same stream class ids as in the origin trace class. */
  50         bt_trace_class_set_assigns_automatic_stream_class_id(out_trace_class,
  51                         BT_FALSE);
  52         BT_COMP_LOGD("Copied content of trace class: in-tc-addr=%p, out-tc-addr=%p",
  53                         in_trace_class, out_trace_class);
  54         return 0;
  55 }
  56
  57 static
  58 int copy_clock_class_content(const bt_clock_class *in_clock_class,
  59                 bt_clock_class *out_clock_class, bt_logging_level log_level,
  60                 bt_self_component *self_comp)
  61 {
  62         const char *clock_class_name, *clock_class_description;
  63         int64_t seconds;
  64         uint64_t cycles;
  65         bt_uuid in_uuid;
  66         int ret = 0;
  67
  68         BT_COMP_LOGD("Copying content of clock class: in-cc-addr=%p, out-cc-addr=%p",
  69                         in_clock_class, out_clock_class);
  70
  71         clock_class_name = bt_clock_class_get_name(in_clock_class);
  72
  73         if (clock_class_name) {
  74                 if (bt_clock_class_set_name(out_clock_class, clock_class_name)
  75                                 != BT_CLOCK_CLASS_SET_NAME_STATUS_OK) {
  76                         BT_COMP_LOGE("Error setting clock class' name cc-addr=%p, name=%p",
  77                                 out_clock_class, clock_class_name);
  78                         out_clock_class = NULL;
  79                         ret = -1;
  80                         goto error;
  81                 }
  82         }
  83
  84         clock_class_description = bt_clock_class_get_description(in_clock_class);
  85
  86         if (clock_class_description) {
  87                 if (bt_clock_class_set_description(out_clock_class,
  88                                 clock_class_description) !=
  89                                 BT_CLOCK_CLASS_SET_DESCRIPTION_STATUS_OK) {
  90                         BT_COMP_LOGE("Error setting clock class' description cc-addr=%p, "
  91                                 "name=%p", out_clock_class, clock_class_description);
  92                         out_clock_class = NULL;
  93                         ret = -1;
  94                         goto error;
  95                 }
  96         }
  97
  98         in_uuid = bt_clock_class_get_uuid(in_clock_class);
  99         if (in_uuid) {
 100                 bt_clock_class_set_uuid(out_clock_class, in_uuid);
 101         }
 102
 103         bt_clock_class_set_frequency(out_clock_class,
 104                         bt_clock_class_get_frequency(in_clock_class));
 105         bt_clock_class_set_precision(out_clock_class,
 106                         bt_clock_class_get_precision(in_clock_class));
 107         bt_clock_class_get_offset(in_clock_class, &seconds, &cycles);
 108         bt_clock_class_set_offset(out_clock_class, seconds, cycles);
 109         bt_clock_class_set_origin_is_unix_epoch(out_clock_class,
 110                         bt_clock_class_origin_is_unix_epoch(in_clock_class));
 111
 112         BT_COMP_LOGD("Copied content of clock class: in-cc-addr=%p, out-cc-addr=%p",
 113                         in_clock_class, out_clock_class);
 114
 115 error:
 116         return ret;
 117 }
 118
 119 static
 120 bt_clock_class *borrow_mapped_clock_class(
 121                 struct trace_ir_metadata_maps *md_maps,
 122                 const bt_clock_class *in_clock_class)
 123 {
 124         BT_ASSERT(md_maps);
 125         BT_ASSERT(in_clock_class);
 126
 127         return g_hash_table_lookup(md_maps->clock_class_map,
 128                         (gpointer) in_clock_class);
 129 }
 130
 131 static
 132 bt_clock_class *create_new_mapped_clock_class(
 133                 bt_self_component *self_comp,
 134                 struct trace_ir_metadata_maps *md_maps,
 135                 const bt_clock_class *in_clock_class)
 136 {
 137         bt_clock_class *out_clock_class;
 138         int ret;
 139         bt_logging_level log_level = md_maps->log_level;
 140
 141         BT_COMP_LOGD("Creating new mapped clock class: in-cc-addr=%p",
 142                         in_clock_class);
 143
 144         BT_ASSERT(md_maps);
 145         BT_ASSERT(in_clock_class);
 146
 147         BT_ASSERT(!borrow_mapped_clock_class(md_maps, in_clock_class));
 148
 149         out_clock_class = bt_clock_class_create(self_comp);
 150         if (!out_clock_class) {
 151                 BT_COMP_LOGE_STR("Cannot create clock class");
 152                 goto end;
 153         }
 154         /* If not, create a new one and add it to the mapping. */
 155         ret = copy_clock_class_content(in_clock_class, out_clock_class,
 156                 log_level, self_comp);
 157         if (ret) {
 158                 BT_COMP_LOGE_STR("Cannot copy clock class");
 159                 goto end;
 160         }
 161
 162         g_hash_table_insert(md_maps->clock_class_map,
 163                         (gpointer) in_clock_class, out_clock_class);
 164
 165         BT_COMP_LOGD("Created new mapped clock class: in-cc-addr=%p, out-cc-addr=%p",
 166                         in_clock_class, out_clock_class);
 167 end:
 168         return out_clock_class;
 169 }
 170
 171 BT_HIDDEN
 172 int copy_stream_class_content(struct trace_ir_maps *ir_maps,
 173                 const bt_stream_class *in_stream_class,
 174                 bt_stream_class *out_stream_class)
 175 {
 176         struct trace_ir_metadata_maps *md_maps;
 177         const bt_clock_class *in_clock_class;
 178         bt_clock_class *out_clock_class;
 179         const bt_field_class *in_packet_context_fc, *in_common_context_fc;
 180         bt_field_class *out_packet_context_fc, *out_common_context_fc;
 181         const char *in_name;
 182         int ret = 0;
 183         bt_logging_level log_level = ir_maps->log_level;
 184         bt_self_component *self_comp = ir_maps->self_comp;
 185
 186         BT_COMP_LOGD("Copying content of stream class: in-sc-addr=%p, out-sc-addr=%p",
 187                         in_stream_class, out_stream_class);
 188
 189         md_maps = borrow_metadata_maps_from_input_stream_class(ir_maps, in_stream_class);
 190         in_clock_class = bt_stream_class_borrow_default_clock_class_const(
 191                                 in_stream_class);
 192
 193         if (in_clock_class) {
 194                 /* Copy the clock class. */
 195                 out_clock_class =
 196                         borrow_mapped_clock_class(md_maps, in_clock_class);
 197                 if (!out_clock_class) {
 198                         out_clock_class = create_new_mapped_clock_class(
 199                                         ir_maps->self_comp, md_maps,
 200                                         in_clock_class);
 201                 }
 202                 bt_stream_class_set_default_clock_class(out_stream_class,
 203                                 out_clock_class);
 204
 205         }
 206
 207         bt_stream_class_set_supports_packets(
 208                 out_stream_class,
 209                 bt_stream_class_supports_packets(in_stream_class),
 210                 bt_stream_class_packets_have_beginning_default_clock_snapshot(
 211                         in_stream_class),
 212                 bt_stream_class_packets_have_end_default_clock_snapshot(
 213                         in_stream_class));
 214         bt_stream_class_set_supports_discarded_events(
 215                 out_stream_class,
 216                 bt_stream_class_supports_discarded_events(in_stream_class),
 217                 bt_stream_class_discarded_events_have_default_clock_snapshots(
 218                         in_stream_class));
 219         bt_stream_class_set_supports_discarded_packets(
 220                 out_stream_class,
 221                 bt_stream_class_supports_discarded_packets(in_stream_class),
 222                 bt_stream_class_discarded_packets_have_default_clock_snapshots(
 223                         in_stream_class));
 224
 225         in_name = bt_stream_class_get_name(in_stream_class);
 226         if (in_name) {
 227                 if (bt_stream_class_set_name(out_stream_class, in_name) !=
 228                                 BT_STREAM_CLASS_SET_NAME_STATUS_OK) {
 229                         BT_COMP_LOGE("Error set stream class name: out-sc-addr=%p, "
 230                                 "name=%s", out_stream_class, in_name);
 231                         ret = -1;
 232                         goto error;
 233                 }
 234         }
 235
 236         bt_stream_class_set_assigns_automatic_stream_id(out_stream_class,
 237                         BT_FALSE);
 238         bt_stream_class_set_assigns_automatic_event_class_id(out_stream_class,
 239                         BT_FALSE);
 240
 241         /*
 242          * Add the input packet context field class to the context to
 243          * resolution in the further steps.
 244          */
 245         in_packet_context_fc =
 246                 bt_stream_class_borrow_packet_context_field_class_const(
 247                                 in_stream_class);
 248         md_maps->fc_resolving_ctx->packet_context =
 249                 in_packet_context_fc;
 250
 251         if (in_packet_context_fc) {
 252                 /* Copy packet context. */
 253                 out_packet_context_fc = create_field_class_copy(
 254                                 md_maps, in_packet_context_fc);
 255
 256                 ret = copy_field_class_content(md_maps,
 257                         in_packet_context_fc, out_packet_context_fc);
 258                 if (ret) {
 259                         ret = -1;
 260                         goto error;
 261                 }
 262
 263                 if (bt_stream_class_set_packet_context_field_class(
 264                                 out_stream_class, out_packet_context_fc) !=
 265                                 BT_STREAM_CLASS_SET_FIELD_CLASS_STATUS_OK) {
 266                         BT_COMP_LOGE("Error setting stream class' packet context "
 267                                 "field class: sc-addr=%p, packet-fc-addr=%p",
 268                                 out_stream_class, out_packet_context_fc);
 269                         ret = -1;
 270                         goto error;
 271                 }
 272         }
 273
 274         /*
 275          * Add the input common context field class to the context to
 276          * resolution in the further steps.
 277          */
 278         in_common_context_fc =
 279                 bt_stream_class_borrow_event_common_context_field_class_const(
 280                                 in_stream_class);
 281         md_maps->fc_resolving_ctx->event_common_context =
 282                 in_common_context_fc;
 283
 284         if (in_common_context_fc) {
 285                 /* Copy common context. */
 286                 /* TODO: I find it a bit awkward to have this special function
 287                  * here to add the debug-info field class. I would like to
 288                  * abstract that.*/
 289                 out_common_context_fc = create_field_class_copy(
 290                                 md_maps, in_common_context_fc);
 291
 292                 ret = copy_event_common_context_field_class_content(
 293                                 md_maps, ir_maps->debug_info_field_class_name,
 294                                 in_common_context_fc, out_common_context_fc);
 295                 if (ret) {
 296                         goto error;
 297                 }
 298
 299                 if (bt_stream_class_set_event_common_context_field_class(
 300                                 out_stream_class, out_common_context_fc) !=
 301                                 BT_STREAM_CLASS_SET_FIELD_CLASS_STATUS_OK) {
 302                         BT_COMP_LOGE("Error setting stream class' packet context "
 303                                 "field class: sc-addr=%p, packet-fc-addr=%p",
 304                                 out_stream_class, out_common_context_fc);
 305                         ret = -1;
 306                         goto error;
 307                 }
 308         }
 309
 310         /* Set packet snapshot boolean fields. */
 311         BT_COMP_LOGD("Copied content of stream class: in-sc-addr=%p, out-sc-addr=%p",
 312                         in_stream_class, out_stream_class);
 313 error:
 314         return ret;
 315 }
 316
 317 BT_HIDDEN
 318 int copy_event_class_content(struct trace_ir_maps *ir_maps,
 319                 const bt_event_class *in_event_class,
 320                 bt_event_class *out_event_class)
 321 {
 322         struct trace_ir_metadata_maps *md_maps;
 323         const char *in_event_class_name, *in_emf_uri;
 324         bt_property_availability prop_avail;
 325         bt_event_class_log_level ec_log_level;
 326         bt_field_class *out_specific_context_fc, *out_payload_fc;
 327         const bt_field_class *in_event_specific_context, *in_event_payload;
 328         int ret = 0;
 329         bt_logging_level log_level = ir_maps->log_level;
 330         bt_self_component *self_comp = ir_maps->self_comp;
 331
 332         BT_COMP_LOGD("Copying content of event class: in-ec-addr=%p, out-ec-addr=%p",
 333                         in_event_class, out_event_class);
 334
 335         /* Copy event class name. */
 336         in_event_class_name = bt_event_class_get_name(in_event_class);
 337         if (in_event_class_name) {
 338                 if (bt_event_class_set_name(out_event_class,
 339                                 in_event_class_name) !=
 340                                 BT_EVENT_CLASS_SET_NAME_STATUS_OK) {
 341                         BT_COMP_LOGE("Error setting event class' name: ec-addr=%p, "
 342                                 "name=%s", out_event_class, in_event_class_name);
 343                         ret = -1;
 344                         goto error;
 345                 }
 346         }
 347
 348         /* Copy event class loglevel. */
 349         prop_avail = bt_event_class_get_log_level(in_event_class,
 350                 &ec_log_level);
 351         if (prop_avail == BT_PROPERTY_AVAILABILITY_AVAILABLE) {
 352                 bt_event_class_set_log_level(out_event_class,
 353                                 ec_log_level);
 354         }
 355
 356         /* Copy event class emf uri. */
 357         in_emf_uri = bt_event_class_get_emf_uri(in_event_class);
 358         if (in_emf_uri) {
 359                 if (bt_event_class_set_emf_uri(out_event_class, in_emf_uri) !=
 360                                 BT_EVENT_CLASS_SET_EMF_URI_STATUS_OK) {
 361                         BT_COMP_LOGE("Error setting event class' emf uri: ec-addr=%p, "
 362                                 "emf uri=%s", out_event_class, in_emf_uri);
 363                         ret = -1;
 364                         goto error;
 365                 }
 366         }
 367
 368         md_maps = borrow_metadata_maps_from_input_event_class(ir_maps, in_event_class);
 369         /*
 370          * Add the input event class' specific ctx to te
 371          * context.
 372          */
 373         in_event_specific_context =
 374                 bt_event_class_borrow_specific_context_field_class_const(
 375                                 in_event_class);
 376
 377         md_maps->fc_resolving_ctx->event_specific_context =
 378                 in_event_specific_context;
 379
 380         if (in_event_specific_context) {
 381                 /* Copy the specific context of this event class. */
 382                 out_specific_context_fc = create_field_class_copy(md_maps,
 383                                 in_event_specific_context);
 384
 385                 ret = copy_field_class_content(md_maps,
 386                                 in_event_specific_context, out_specific_context_fc);
 387                 if (ret) {
 388                         goto error;
 389                 }
 390                 /*
 391                  * Add the output specific context to the output event
 392                  * class.
 393                  */
 394                 if (bt_event_class_set_specific_context_field_class(
 395                                 out_event_class, out_specific_context_fc) !=
 396                                 BT_EVENT_CLASS_SET_FIELD_CLASS_STATUS_OK) {
 397                         BT_COMP_LOGE("Error setting event class' specific context "
 398                                 "field class: ec-addr=%p, ctx-fc-addr=%p",
 399                                 out_event_class, out_specific_context_fc);
 400                         ret = -1;
 401                         goto error;
 402                 }
 403         }
 404
 405         /*
 406          * Add the input event class' payload field class to
 407          * the context.
 408          */
 409         in_event_payload = bt_event_class_borrow_payload_field_class_const(
 410                                 in_event_class);
 411
 412         md_maps->fc_resolving_ctx->event_payload = in_event_payload;
 413
 414         if (in_event_payload) {
 415         /* Copy the payload of this event class. */
 416                 out_payload_fc = create_field_class_copy(md_maps,
 417                                 in_event_payload);
 418                 ret = copy_field_class_content(md_maps,
 419                                 in_event_payload, out_payload_fc);
 420                 if (ret) {
 421                         goto error;
 422                 }
 423
 424                 /* Add the output payload to the output event class. */
 425                 if (bt_event_class_set_payload_field_class(
 426                                 out_event_class, out_payload_fc) !=
 427                                 BT_EVENT_CLASS_SET_FIELD_CLASS_STATUS_OK) {
 428                         BT_COMP_LOGE("Error setting event class' payload "
 429                                 "field class: ec-addr=%p, payload-fc-addr=%p",
 430                                 out_event_class, out_payload_fc);
 431                         ret = -1;
 432                         goto error;
 433                 }
 434         }
 435
 436         BT_COMP_LOGD("Copied content of event class: in-ec-addr=%p, out-ec-addr=%p",
 437                         in_event_class, out_event_class);
 438 error:
 439         return ret;
 440 }
 441
 442 BT_HIDDEN
 443 int copy_event_common_context_field_class_content(
 444                 struct trace_ir_metadata_maps *md_maps,
 445                 const char *debug_info_fc_name,
 446                 const bt_field_class *in_field_class,
 447                 bt_field_class *out_field_class)
 448 {
 449         bt_field_class *debug_field_class = NULL, *bin_field_class = NULL,
 450                        *func_field_class = NULL, *src_field_class = NULL;
 451         int ret = 0;
 452         bt_logging_level log_level = md_maps->log_level;
 453         bt_self_component *self_comp = md_maps->self_comp;
 454
 455         BT_COMP_LOGD("Copying content of event common context field class: "
 456                 "in-fc-addr=%p, out-fc-addr=%p", in_field_class, out_field_class);
 457
 458         /* Copy the content of the input common context. */
 459         ret = copy_field_class_content(md_maps, in_field_class, out_field_class);
 460         if (ret) {
 461                 goto error;
 462         }
 463
 464         /*
 465          * If this event common context has the necessary fields to compute the
 466          * debug information append the debug-info field class to the event
 467          * common context.
 468          */
 469         if (is_event_common_ctx_dbg_info_compatible(in_field_class, debug_info_fc_name)) {
 470                 /*
 471                  * The struct field and 3 sub-fields are not stored in the
 472                  * field class map because they don't have input equivalent.
 473                  * We need to put our reference each of these field classes
 474                  * once they are added to their respective containing field
 475                  * classes.
 476                  */
 477                 debug_field_class = bt_field_class_structure_create(
 478                                 md_maps->output_trace_class);
 479                 if (!debug_field_class) {
 480                         BT_COMP_LOGE_STR("Failed to create debug_info structure.");
 481                         ret = -1;
 482                         goto error;
 483                 }
 484
 485                 bin_field_class = bt_field_class_string_create(
 486                                 md_maps->output_trace_class);
 487                 if (!bin_field_class) {
 488                         BT_COMP_LOGE_STR("Failed to create string for field=bin.");
 489                         ret = -1;
 490                         goto error;
 491                 }
 492
 493                 func_field_class = bt_field_class_string_create(
 494                                 md_maps->output_trace_class);
 495                 if (!func_field_class) {
 496                         BT_COMP_LOGE_STR("Failed to create string for field=func.");
 497                         ret = -1;
 498                         goto error;
 499                 }
 500
 501                 src_field_class = bt_field_class_string_create(
 502                                 md_maps->output_trace_class);
 503                 if (!src_field_class) {
 504                         BT_COMP_LOGE_STR("Failed to create string for field=src.");
 505                         ret = -1;
 506                         goto error;
 507                 }
 508
 509                 if (bt_field_class_structure_append_member(
 510                                 debug_field_class, "bin", bin_field_class) !=
 511                                 BT_FIELD_CLASS_STRUCTURE_APPEND_MEMBER_STATUS_OK) {
 512                         BT_COMP_LOGE_STR("Failed to add a field to debug_info "
 513                                         "struct: field=bin.");
 514                         ret = -1;
 515                         goto error;
 516                 }
 517                 BT_FIELD_CLASS_PUT_REF_AND_RESET(bin_field_class);
 518
 519                 if (bt_field_class_structure_append_member(
 520                                 debug_field_class, "func", func_field_class) !=
 521                                 BT_FIELD_CLASS_STRUCTURE_APPEND_MEMBER_STATUS_OK) {
 522                         BT_COMP_LOGE_STR("Failed to add a field to debug_info "
 523                                         "struct: field=func.");
 524                         ret = -1;
 525                         goto error;
 526                 }
 527                 BT_FIELD_CLASS_PUT_REF_AND_RESET(func_field_class);
 528
 529                 if (bt_field_class_structure_append_member(
 530                                 debug_field_class, "src", src_field_class) !=
 531                                 BT_FIELD_CLASS_STRUCTURE_APPEND_MEMBER_STATUS_OK) {
 532                         BT_COMP_LOGE_STR("Failed to add a field to debug_info "
 533                                         "struct: field=src.");
 534                         ret = -1;
 535                         goto error;
 536                 }
 537                 BT_FIELD_CLASS_PUT_REF_AND_RESET(src_field_class);
 538
 539                 /*Add the filled debug-info field class to the common context. */
 540                 if (bt_field_class_structure_append_member(out_field_class,
 541                                 debug_info_fc_name, debug_field_class) !=
 542                                 BT_FIELD_CLASS_STRUCTURE_APPEND_MEMBER_STATUS_OK) {
 543                         BT_COMP_LOGE_STR("Failed to add debug_info field to "
 544                                         "event common context.");
 545                         ret = -1;
 546                         goto error;
 547                 }
 548                 BT_FIELD_CLASS_PUT_REF_AND_RESET(debug_field_class);
 549         }
 550         BT_COMP_LOGD("Copied content of event common context field class: "
 551                 "in-fc-addr=%p, out-fc-addr=%p", in_field_class, out_field_class);
 552         goto end;
 553
 554 error:
 555         if (debug_field_class) {
 556                 bt_field_class_put_ref(debug_field_class);
 557         }
 558         if (bin_field_class) {
 559                 bt_field_class_put_ref(bin_field_class);
 560         }
 561         if (func_field_class) {
 562                 bt_field_class_put_ref(func_field_class);
 563         }
 564         if (src_field_class) {
 565                 bt_field_class_put_ref(src_field_class);
 566         }
 567 end:
 568         return ret;
 569 }
 570
 571 BT_HIDDEN
 572 bt_field_class *create_field_class_copy(struct trace_ir_metadata_maps *md_maps,
 573                 const bt_field_class *in_field_class)
 574 {
 575         return create_field_class_copy_internal(md_maps, in_field_class);
 576 }
 577
 578 BT_HIDDEN
 579 int copy_field_class_content(struct trace_ir_metadata_maps *md_maps,
 580                 const bt_field_class *in_field_class,
 581                 bt_field_class *out_field_class)
 582 {
 583         return copy_field_class_content_internal(md_maps, in_field_class,
 584                         out_field_class);
 585 }