formats/ctf/ir/trace.c

   1 /*
   2  * trace.c
   3  *
   4  * Babeltrace CTF 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 #include <babeltrace/ctf-ir/trace-internal.h>
  30 #include <babeltrace/ctf-ir/clock-internal.h>
  31 #include <babeltrace/ctf-ir/stream-internal.h>
  32 #include <babeltrace/ctf-ir/stream-class-internal.h>
  33 #include <babeltrace/ctf-writer/functor-internal.h>
  34 #include <babeltrace/ctf-ir/event-types-internal.h>
  35 #include <babeltrace/ctf-ir/attributes-internal.h>
  36 #include <babeltrace/ctf-ir/visitor-internal.h>
  37 #include <babeltrace/ctf-ir/utils.h>
  38 #include <babeltrace/compiler.h>
  39 #include <babeltrace/objects.h>
  40
  41 #define DEFAULT_IDENTIFIER_SIZE 128
  42 #define DEFAULT_METADATA_STRING_SIZE 4096
  43
  44 static
  45 void bt_ctf_trace_destroy(struct bt_ctf_ref *ref);
  46 static
  47 int init_trace_packet_header(struct bt_ctf_trace *trace);
  48 static
  49 void bt_ctf_trace_freeze(struct bt_ctf_trace *trace);
  50
  51 static
  52 const unsigned int field_type_aliases_alignments[] = {
  53         [FIELD_TYPE_ALIAS_UINT5_T] = 1,
  54         [FIELD_TYPE_ALIAS_UINT8_T ... FIELD_TYPE_ALIAS_UINT16_T] = 8,
  55         [FIELD_TYPE_ALIAS_UINT27_T] = 1,
  56         [FIELD_TYPE_ALIAS_UINT32_T ... FIELD_TYPE_ALIAS_UINT64_T] = 8,
  57 };
  58
  59 static
  60 const unsigned int field_type_aliases_sizes[] = {
  61         [FIELD_TYPE_ALIAS_UINT5_T] = 5,
  62         [FIELD_TYPE_ALIAS_UINT8_T] = 8,
  63         [FIELD_TYPE_ALIAS_UINT16_T] = 16,
  64         [FIELD_TYPE_ALIAS_UINT27_T] = 27,
  65         [FIELD_TYPE_ALIAS_UINT32_T] = 32,
  66         [FIELD_TYPE_ALIAS_UINT64_T] = 64,
  67 };
  68
  69 static
  70 void put_stream_class(struct bt_ctf_stream_class *stream_class)
  71 {
  72         (void) bt_ctf_stream_class_set_trace(stream_class, NULL);
  73         bt_ctf_stream_class_put(stream_class);
  74 }
  75
  76 struct bt_ctf_trace *bt_ctf_trace_create(void)
  77 {
  78         struct bt_ctf_trace *trace = NULL;
  79
  80         trace = g_new0(struct bt_ctf_trace, 1);
  81         if (!trace) {
  82                 goto error;
  83         }
  84
  85         bt_ctf_trace_set_byte_order(trace, BT_CTF_BYTE_ORDER_NATIVE);
  86         bt_ctf_ref_init(&trace->ref_count);
  87         trace->clocks = g_ptr_array_new_with_free_func(
  88                 (GDestroyNotify) bt_ctf_clock_put);
  89         trace->streams = g_ptr_array_new_with_free_func(
  90                 (GDestroyNotify) bt_ctf_stream_put);
  91         trace->stream_classes = g_ptr_array_new_with_free_func(
  92                 (GDestroyNotify) put_stream_class);
  93         if (!trace->clocks || !trace->stream_classes || !trace->streams) {
  94                 goto error_destroy;
  95         }
  96
  97         /* Generate a trace UUID */
  98         uuid_generate(trace->uuid);
  99         if (init_trace_packet_header(trace)) {
 100                 goto error_destroy;
 101         }
 102
 103         /* Create the environment array object */
 104         trace->environment = bt_ctf_attributes_create();
 105         if (!trace->environment) {
 106                 goto error_destroy;
 107         }
 108
 109         return trace;
 110
 111 error_destroy:
 112         bt_ctf_trace_destroy(&trace->ref_count);
 113         trace = NULL;
 114 error:
 115         return trace;
 116 }
 117
 118 void bt_ctf_trace_destroy(struct bt_ctf_ref *ref)
 119 {
 120         struct bt_ctf_trace *trace;
 121
 122         if (!ref) {
 123                 return;
 124         }
 125
 126         trace = container_of(ref, struct bt_ctf_trace, ref_count);
 127         if (trace->environment) {
 128                 bt_ctf_attributes_destroy(trace->environment);
 129         }
 130
 131         if (trace->clocks) {
 132                 g_ptr_array_free(trace->clocks, TRUE);
 133         }
 134
 135         if (trace->streams) {
 136                 g_ptr_array_free(trace->streams, TRUE);
 137         }
 138
 139         if (trace->stream_classes) {
 140                 g_ptr_array_free(trace->stream_classes, TRUE);
 141         }
 142
 143         bt_ctf_field_type_put(trace->packet_header_type);
 144         g_free(trace);
 145 }
 146
 147 struct bt_ctf_stream *bt_ctf_trace_create_stream(struct bt_ctf_trace *trace,
 148                 struct bt_ctf_stream_class *stream_class)
 149 {
 150         int ret;
 151         int stream_class_found = 0;
 152         size_t i;
 153         struct bt_ctf_stream *stream = NULL;
 154
 155         if (!trace || !stream_class) {
 156                 goto error;
 157         }
 158
 159         stream = bt_ctf_stream_create(stream_class, trace);
 160         if (!stream) {
 161                 goto error;
 162         }
 163
 164         for (i = 0; i < trace->stream_classes->len; i++) {
 165                 if (trace->stream_classes->pdata[i] == stream_class) {
 166                         stream_class_found = 1;
 167                 }
 168         }
 169
 170         if (!stream_class_found) {
 171                 ret = bt_ctf_trace_add_stream_class(trace, stream_class);
 172                 if (ret) {
 173                         goto error;
 174                 }
 175         }
 176
 177         bt_ctf_stream_get(stream);
 178         g_ptr_array_add(trace->streams, stream);
 179
 180         return stream;
 181 error:
 182         bt_ctf_stream_put(stream);
 183         return NULL;
 184 }
 185
 186 int bt_ctf_trace_set_environment_field(struct bt_ctf_trace *trace,
 187                 const char *name, struct bt_object *value)
 188 {
 189         int ret = 0;
 190
 191         if (!trace || !name || !value ||
 192                 bt_ctf_validate_identifier(name) ||
 193                 !(bt_object_is_integer(value) || bt_object_is_string(value))) {
 194                 ret = -1;
 195                 goto end;
 196         }
 197
 198         if (strchr(name, ' ')) {
 199                 ret = -1;
 200                 goto end;
 201         }
 202
 203         if (trace->frozen) {
 204                 /*
 205                  * New environment fields may be added to a frozen trace,
 206                  * but existing fields may not be changed.
 207                  *
 208                  * The object passed is frozen like all other attributes.
 209                  */
 210                 struct bt_object *attribute =
 211                         bt_ctf_attributes_get_field_value_by_name(
 212                                 trace->environment, name);
 213
 214                 if (attribute) {
 215                         BT_OBJECT_PUT(attribute);
 216                         ret = -1;
 217                         goto end;
 218                 }
 219
 220                 bt_object_freeze(value);
 221         }
 222
 223         ret = bt_ctf_attributes_set_field_value(trace->environment, name,
 224                 value);
 225
 226 end:
 227         return ret;
 228 }
 229
 230 int bt_ctf_trace_set_environment_field_string(struct bt_ctf_trace *trace,
 231                 const char *name, const char *value)
 232 {
 233         int ret = 0;
 234         struct bt_object *env_value_string_obj = NULL;
 235
 236         if (!trace || !name || !value) {
 237                 ret = -1;
 238                 goto end;
 239         }
 240
 241         if (trace->frozen) {
 242                 /*
 243                  * New environment fields may be added to a frozen trace,
 244                  * but existing fields may not be changed.
 245                  */
 246                 struct bt_object *attribute =
 247                         bt_ctf_attributes_get_field_value_by_name(
 248                                 trace->environment, name);
 249
 250                 if (attribute) {
 251                         BT_OBJECT_PUT(attribute);
 252                         ret = -1;
 253                         goto end;
 254                 }
 255         }
 256
 257         env_value_string_obj = bt_object_string_create_init(value);
 258
 259         if (!env_value_string_obj) {
 260                 ret = -1;
 261                 goto end;
 262         }
 263
 264         if (trace->frozen) {
 265                 bt_object_freeze(env_value_string_obj);
 266         }
 267         ret = bt_ctf_trace_set_environment_field(trace, name,
 268                 env_value_string_obj);
 269
 270 end:
 271         BT_OBJECT_PUT(env_value_string_obj);
 272
 273         return ret;
 274 }
 275
 276 int bt_ctf_trace_set_environment_field_integer(struct bt_ctf_trace *trace,
 277                 const char *name, int64_t value)
 278 {
 279         int ret = 0;
 280         struct bt_object *env_value_integer_obj = NULL;
 281
 282         if (!trace || !name) {
 283                 ret = -1;
 284                 goto end;
 285         }
 286
 287         if (trace->frozen) {
 288                 /*
 289                  * New environment fields may be added to a frozen trace,
 290                  * but existing fields may not be changed.
 291                  */
 292                 struct bt_object *attribute =
 293                         bt_ctf_attributes_get_field_value_by_name(
 294                                 trace->environment, name);
 295
 296                 if (attribute) {
 297                         BT_OBJECT_PUT(attribute);
 298                         ret = -1;
 299                         goto end;
 300                 }
 301         }
 302
 303         env_value_integer_obj = bt_object_integer_create_init(value);
 304         if (!env_value_integer_obj) {
 305                 ret = -1;
 306                 goto end;
 307         }
 308
 309         ret = bt_ctf_trace_set_environment_field(trace, name,
 310                 env_value_integer_obj);
 311         if (trace->frozen) {
 312                 bt_object_freeze(env_value_integer_obj);
 313         }
 314 end:
 315         BT_OBJECT_PUT(env_value_integer_obj);
 316
 317         return ret;
 318 }
 319
 320 int bt_ctf_trace_get_environment_field_count(struct bt_ctf_trace *trace)
 321 {
 322         int ret = 0;
 323
 324         if (!trace) {
 325                 ret = -1;
 326                 goto end;
 327         }
 328
 329         ret = bt_ctf_attributes_get_count(trace->environment);
 330
 331 end:
 332         return ret;
 333 }
 334
 335 const char *
 336 bt_ctf_trace_get_environment_field_name(struct bt_ctf_trace *trace,
 337                 int index)
 338 {
 339         const char *ret = NULL;
 340
 341         if (!trace) {
 342                 goto end;
 343         }
 344
 345         ret = bt_ctf_attributes_get_field_name(trace->environment, index);
 346
 347 end:
 348         return ret;
 349 }
 350
 351 struct bt_object *bt_ctf_trace_get_environment_field_value(
 352                 struct bt_ctf_trace *trace, int index)
 353 {
 354         struct bt_object *ret = NULL;
 355
 356         if (!trace) {
 357                 goto end;
 358         }
 359
 360         ret = bt_ctf_attributes_get_field_value(trace->environment, index);
 361
 362 end:
 363         return ret;
 364 }
 365
 366 struct bt_object *bt_ctf_trace_get_environment_field_value_by_name(
 367                 struct bt_ctf_trace *trace, const char *name)
 368 {
 369         struct bt_object *ret = NULL;
 370
 371         if (!trace || !name) {
 372                 goto end;
 373         }
 374
 375         ret = bt_ctf_attributes_get_field_value_by_name(trace->environment,
 376                 name);
 377
 378 end:
 379         return ret;
 380 }
 381
 382 int bt_ctf_trace_add_clock(struct bt_ctf_trace *trace,
 383                 struct bt_ctf_clock *clock)
 384 {
 385         int ret = 0;
 386         struct search_query query = { .value = clock, .found = 0 };
 387
 388         if (!trace || !clock) {
 389                 ret = -1;
 390                 goto end;
 391         }
 392
 393         /* Check for duplicate clocks */
 394         g_ptr_array_foreach(trace->clocks, value_exists, &query);
 395         if (query.found) {
 396                 ret = -1;
 397                 goto end;
 398         }
 399
 400         bt_ctf_clock_get(clock);
 401         g_ptr_array_add(trace->clocks, clock);
 402 end:
 403         return ret;
 404 }
 405
 406 int bt_ctf_trace_get_clock_count(struct bt_ctf_trace *trace)
 407 {
 408         int ret = -1;
 409
 410         if (!trace) {
 411                 goto end;
 412         }
 413
 414         ret = trace->clocks->len;
 415 end:
 416         return ret;
 417 }
 418
 419 struct bt_ctf_clock *bt_ctf_trace_get_clock(struct bt_ctf_trace *trace,
 420                 int index)
 421 {
 422         struct bt_ctf_clock *clock = NULL;
 423
 424         if (!trace || index < 0 || index >= trace->clocks->len) {
 425                 goto end;
 426         }
 427
 428         clock = g_ptr_array_index(trace->clocks, index);
 429         bt_ctf_clock_get(clock);
 430 end:
 431         return clock;
 432 }
 433
 434 int bt_ctf_trace_add_stream_class(struct bt_ctf_trace *trace,
 435                 struct bt_ctf_stream_class *stream_class)
 436 {
 437         int ret, i;
 438         int64_t stream_id;
 439
 440         if (!trace || !stream_class) {
 441                 ret = -1;
 442                 goto end;
 443         }
 444
 445         for (i = 0; i < trace->stream_classes->len; i++) {
 446                 if (trace->stream_classes->pdata[i] == stream_class) {
 447                         /* Stream already registered to the trace */
 448                         ret = -1;
 449                         goto end;
 450                 }
 451         }
 452
 453         ret = bt_ctf_stream_class_resolve_types(stream_class, trace);
 454         if (ret) {
 455                 goto end;
 456         }
 457
 458         stream_id = bt_ctf_stream_class_get_id(stream_class);
 459         if (stream_id < 0) {
 460                 stream_id = trace->next_stream_id++;
 461
 462                 /* Try to assign a new stream id */
 463                 for (i = 0; i < trace->stream_classes->len; i++) {
 464                         if (stream_id == bt_ctf_stream_class_get_id(
 465                                 trace->stream_classes->pdata[i])) {
 466                                 /* Duplicate stream id found */
 467                                 ret = -1;
 468                                 goto end;
 469                         }
 470                 }
 471
 472                 if (bt_ctf_stream_class_set_id_no_check(stream_class,
 473                         stream_id)) {
 474                         /* TODO Should retry with a different stream id */
 475                         ret = -1;
 476                         goto end;
 477                 }
 478         }
 479
 480         /* Set weak reference to trace in stream class */
 481         ret = bt_ctf_stream_class_set_trace(stream_class, trace);
 482         if (ret) {
 483                 /* Stream class already part of another trace */
 484                 goto end;
 485         }
 486
 487         bt_ctf_stream_class_get(stream_class);
 488         g_ptr_array_add(trace->stream_classes, stream_class);
 489
 490         /*
 491          * Freeze the trace and its packet header.
 492          *
 493          * All field type byte orders set as "native" byte ordering can now be
 494          * safely set to trace's own endianness, including the stream class'.
 495          */
 496         bt_ctf_field_type_set_native_byte_order(trace->packet_header_type,
 497                 trace->byte_order);
 498         ret = bt_ctf_stream_class_set_byte_order(stream_class,
 499                 trace->byte_order == LITTLE_ENDIAN ?
 500                 BT_CTF_BYTE_ORDER_LITTLE_ENDIAN : BT_CTF_BYTE_ORDER_BIG_ENDIAN);
 501         if (ret) {
 502                 goto end;
 503         }
 504
 505         bt_ctf_stream_class_freeze(stream_class);
 506         if (!trace->frozen) {
 507                 bt_ctf_trace_freeze(trace);
 508         }
 509 end:
 510         if (ret) {
 511                 (void) bt_ctf_stream_class_set_trace(stream_class, NULL);
 512         }
 513         return ret;
 514 }
 515
 516 int bt_ctf_trace_get_stream_class_count(struct bt_ctf_trace *trace)
 517 {
 518         int ret;
 519
 520         if (!trace) {
 521                 ret = -1;
 522                 goto end;
 523         }
 524
 525         ret = trace->stream_classes->len;
 526 end:
 527         return ret;
 528 }
 529
 530 struct bt_ctf_stream_class *bt_ctf_trace_get_stream_class(
 531                 struct bt_ctf_trace *trace, int index)
 532 {
 533         struct bt_ctf_stream_class *stream_class = NULL;
 534
 535         if (!trace || index < 0 || index >= trace->stream_classes->len) {
 536                 goto end;
 537         }
 538
 539         stream_class = g_ptr_array_index(trace->stream_classes, index);
 540         bt_ctf_stream_class_get(stream_class);
 541 end:
 542         return stream_class;
 543 }
 544
 545 struct bt_ctf_clock *bt_ctf_trace_get_clock_by_name(
 546                 struct bt_ctf_trace *trace, const char *name)
 547 {
 548         size_t i;
 549         struct bt_ctf_clock *clock = NULL;
 550
 551         if (!trace || !name) {
 552                 goto end;
 553         }
 554
 555         for (i = 0; i < trace->clocks->len; ++i) {
 556                 struct bt_ctf_clock *cur_clk =
 557                         g_ptr_array_index(trace->clocks, i);
 558                 const char *cur_clk_name = bt_ctf_clock_get_name(cur_clk);
 559
 560                 if (!cur_clk_name) {
 561                         goto end;
 562                 }
 563
 564                 if (!strcmp(cur_clk_name, name)) {
 565                         clock = cur_clk;
 566                         bt_ctf_clock_get(clock);
 567                         goto end;
 568                 }
 569         }
 570
 571 end:
 572         return clock;
 573 }
 574
 575 BT_HIDDEN
 576 const char *get_byte_order_string(int byte_order)
 577 {
 578         const char *string;
 579
 580         switch (byte_order) {
 581         case LITTLE_ENDIAN:
 582                 string = "le";
 583                 break;
 584         case BIG_ENDIAN:
 585                 string = "be";
 586                 break;
 587         default:
 588                 string = "unknown";
 589                 break;
 590         }
 591
 592         return string;
 593 }
 594
 595 static
 596 int append_trace_metadata(struct bt_ctf_trace *trace,
 597                 struct metadata_context *context)
 598 {
 599         unsigned char *uuid = trace->uuid;
 600         int ret;
 601
 602         g_string_append(context->string, "trace {\n");
 603
 604         g_string_append(context->string, "\tmajor = 1;\n");
 605         g_string_append(context->string, "\tminor = 8;\n");
 606
 607         g_string_append_printf(context->string,
 608                 "\tuuid = \"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\";\n",
 609                 uuid[0], uuid[1], uuid[2], uuid[3],
 610                 uuid[4], uuid[5], uuid[6], uuid[7],
 611                 uuid[8], uuid[9], uuid[10], uuid[11],
 612                 uuid[12], uuid[13], uuid[14], uuid[15]);
 613         g_string_append_printf(context->string, "\tbyte_order = %s;\n",
 614                 get_byte_order_string(trace->byte_order));
 615
 616         g_string_append(context->string, "\tpacket.header := ");
 617         context->current_indentation_level++;
 618         g_string_assign(context->field_name, "");
 619         ret = bt_ctf_field_type_serialize(trace->packet_header_type,
 620                 context);
 621         if (ret) {
 622                 goto end;
 623         }
 624         context->current_indentation_level--;
 625
 626         g_string_append(context->string, ";\n};\n\n");
 627 end:
 628         return ret;
 629 }
 630
 631 static
 632 void append_env_metadata(struct bt_ctf_trace *trace,
 633                 struct metadata_context *context)
 634 {
 635         int i;
 636         int env_size;
 637
 638         env_size = bt_ctf_attributes_get_count(trace->environment);
 639
 640         if (env_size <= 0) {
 641                 return;
 642         }
 643
 644         g_string_append(context->string, "env {\n");
 645
 646         for (i = 0; i < env_size; ++i) {
 647                 struct bt_object *env_field_value_obj = NULL;
 648                 const char *entry_name;
 649
 650                 entry_name = bt_ctf_attributes_get_field_name(
 651                         trace->environment, i);
 652                 env_field_value_obj = bt_ctf_attributes_get_field_value(
 653                         trace->environment, i);
 654
 655                 if (!entry_name || !env_field_value_obj) {
 656                         goto loop_next;
 657                 }
 658
 659                 switch (bt_object_get_type(env_field_value_obj)) {
 660                 case BT_OBJECT_TYPE_INTEGER:
 661                 {
 662                         int ret;
 663                         int64_t int_value;
 664
 665                         ret = bt_object_integer_get(env_field_value_obj,
 666                                 &int_value);
 667
 668                         if (ret) {
 669                                 goto loop_next;
 670                         }
 671
 672                         g_string_append_printf(context->string,
 673                                 "\t%s = %" PRId64 ";\n", entry_name,
 674                                 int_value);
 675                         break;
 676                 }
 677                 case BT_OBJECT_TYPE_STRING:
 678                 {
 679                         int ret;
 680                         const char *str_value;
 681                         char *escaped_str = NULL;
 682
 683                         ret = bt_object_string_get(env_field_value_obj,
 684                                 &str_value);
 685
 686                         if (ret) {
 687                                 goto loop_next;
 688                         }
 689
 690                         escaped_str = g_strescape(str_value, NULL);
 691
 692                         if (!escaped_str) {
 693                                 goto loop_next;
 694                         }
 695
 696                         g_string_append_printf(context->string,
 697                                 "\t%s = \"%s\";\n", entry_name, escaped_str);
 698                         free(escaped_str);
 699                         break;
 700                 }
 701
 702                 default:
 703                         goto loop_next;
 704                 }
 705
 706 loop_next:
 707                 BT_OBJECT_PUT(env_field_value_obj);
 708         }
 709
 710         g_string_append(context->string, "};\n\n");
 711 }
 712
 713 char *bt_ctf_trace_get_metadata_string(struct bt_ctf_trace *trace)
 714 {
 715         char *metadata = NULL;
 716         struct metadata_context *context = NULL;
 717         int err = 0;
 718         size_t i;
 719
 720         if (!trace) {
 721                 goto end;
 722         }
 723
 724         context = g_new0(struct metadata_context, 1);
 725         if (!context) {
 726                 goto end;
 727         }
 728
 729         context->field_name = g_string_sized_new(DEFAULT_IDENTIFIER_SIZE);
 730         context->string = g_string_sized_new(DEFAULT_METADATA_STRING_SIZE);
 731         g_string_append(context->string, "/* CTF 1.8 */\n\n");
 732         if (append_trace_metadata(trace, context)) {
 733                 goto error;
 734         }
 735         append_env_metadata(trace, context);
 736         g_ptr_array_foreach(trace->clocks,
 737                 (GFunc)bt_ctf_clock_serialize, context);
 738
 739         for (i = 0; i < trace->stream_classes->len; i++) {
 740                 err = bt_ctf_stream_class_serialize(
 741                         trace->stream_classes->pdata[i], context);
 742                 if (err) {
 743                         goto error;
 744                 }
 745         }
 746
 747         metadata = context->string->str;
 748 error:
 749         g_string_free(context->string, err ? TRUE : FALSE);
 750         g_string_free(context->field_name, TRUE);
 751         g_free(context);
 752 end:
 753         return metadata;
 754 }
 755
 756 enum bt_ctf_byte_order bt_ctf_trace_get_byte_order(struct bt_ctf_trace *trace)
 757 {
 758         enum bt_ctf_byte_order ret = BT_CTF_BYTE_ORDER_UNKNOWN;
 759
 760         if (!trace) {
 761                 goto end;
 762         }
 763
 764         switch (trace->byte_order) {
 765         case BIG_ENDIAN:
 766                 ret = BT_CTF_BYTE_ORDER_BIG_ENDIAN;
 767                 break;
 768         case LITTLE_ENDIAN:
 769                 ret = BT_CTF_BYTE_ORDER_LITTLE_ENDIAN;
 770                 break;
 771         default:
 772                 break;
 773         }
 774 end:
 775         return ret;
 776 }
 777
 778 int bt_ctf_trace_set_byte_order(struct bt_ctf_trace *trace,
 779                 enum bt_ctf_byte_order byte_order)
 780 {
 781         int ret = 0;
 782         int internal_byte_order;
 783
 784         if (!trace || trace->frozen) {
 785                 ret = -1;
 786                 goto end;
 787         }
 788
 789         switch (byte_order) {
 790         case BT_CTF_BYTE_ORDER_NATIVE:
 791                 /*
 792                  * This doesn't make sense since the CTF specification defines
 793                  * the "native" byte order as "the byte order described in the
 794                  * trace description". However, this behavior had been
 795                  * implemented as part of v1.2 and is kept to maintain
 796                  * compatibility.
 797                  *
 798                  * This may be changed on a major version bump only.
 799                  */
 800                 internal_byte_order = (G_BYTE_ORDER == G_LITTLE_ENDIAN) ?
 801                         LITTLE_ENDIAN : BIG_ENDIAN;
 802                 break;
 803         case BT_CTF_BYTE_ORDER_LITTLE_ENDIAN:
 804                 internal_byte_order = LITTLE_ENDIAN;
 805                 break;
 806         case BT_CTF_BYTE_ORDER_BIG_ENDIAN:
 807         case BT_CTF_BYTE_ORDER_NETWORK:
 808                 internal_byte_order = BIG_ENDIAN;
 809                 break;
 810         default:
 811                 ret = -1;
 812                 goto end;
 813         }
 814
 815         trace->byte_order = internal_byte_order;
 816 end:
 817         return ret;
 818 }
 819
 820 struct bt_ctf_field_type *bt_ctf_trace_get_packet_header_type(
 821                 struct bt_ctf_trace *trace)
 822 {
 823         struct bt_ctf_field_type *field_type = NULL;
 824
 825         if (!trace) {
 826                 goto end;
 827         }
 828
 829         bt_ctf_field_type_get(trace->packet_header_type);
 830         field_type = trace->packet_header_type;
 831 end:
 832         return field_type;
 833 }
 834
 835 int bt_ctf_trace_set_packet_header_type(struct bt_ctf_trace *trace,
 836                 struct bt_ctf_field_type *packet_header_type)
 837 {
 838         int ret = 0;
 839
 840         if (!trace || !packet_header_type || trace->frozen) {
 841                 ret = -1;
 842                 goto end;
 843         }
 844
 845         /* packet_header_type must be a structure */
 846         if (bt_ctf_field_type_get_type_id(packet_header_type) !=
 847                 CTF_TYPE_STRUCT) {
 848                 ret = -1;
 849                 goto end;
 850         }
 851
 852         bt_ctf_field_type_get(packet_header_type);
 853         bt_ctf_field_type_put(trace->packet_header_type);
 854         trace->packet_header_type = packet_header_type;
 855 end:
 856         return ret;
 857 }
 858
 859 void bt_ctf_trace_get(struct bt_ctf_trace *trace)
 860 {
 861         if (!trace) {
 862                 return;
 863         }
 864
 865         bt_ctf_ref_get(&trace->ref_count);
 866 }
 867
 868 void bt_ctf_trace_put(struct bt_ctf_trace *trace)
 869 {
 870         if (!trace) {
 871                 return;
 872         }
 873
 874         bt_ctf_ref_put(&trace->ref_count, bt_ctf_trace_destroy);
 875 }
 876
 877 BT_HIDDEN
 878 struct bt_ctf_field_type *get_field_type(enum field_type_alias alias)
 879 {
 880         unsigned int alignment, size;
 881         struct bt_ctf_field_type *field_type;
 882
 883         if (alias >= NR_FIELD_TYPE_ALIAS) {
 884                 return NULL;
 885         }
 886
 887         alignment = field_type_aliases_alignments[alias];
 888         size = field_type_aliases_sizes[alias];
 889         field_type = bt_ctf_field_type_integer_create(size);
 890         bt_ctf_field_type_set_alignment(field_type, alignment);
 891         return field_type;
 892 }
 893
 894 static
 895 void bt_ctf_trace_freeze(struct bt_ctf_trace *trace)
 896 {
 897         bt_ctf_trace_resolve_types(trace);
 898         bt_ctf_attributes_freeze(trace->environment);
 899         trace->frozen = 1;
 900 }
 901
 902 static
 903 int init_trace_packet_header(struct bt_ctf_trace *trace)
 904 {
 905         int ret = 0;
 906         struct bt_ctf_field *magic = NULL, *uuid_array = NULL;
 907         struct bt_ctf_field_type *_uint32_t =
 908                 get_field_type(FIELD_TYPE_ALIAS_UINT32_T);
 909         struct bt_ctf_field_type *_uint8_t =
 910                 get_field_type(FIELD_TYPE_ALIAS_UINT8_T);
 911         struct bt_ctf_field_type *trace_packet_header_type =
 912                 bt_ctf_field_type_structure_create();
 913         struct bt_ctf_field_type *uuid_array_type =
 914                 bt_ctf_field_type_array_create(_uint8_t, 16);
 915
 916         if (!trace_packet_header_type || !uuid_array_type) {
 917                 ret = -1;
 918                 goto end;
 919         }
 920
 921         ret = bt_ctf_field_type_structure_add_field(trace_packet_header_type,
 922                 _uint32_t, "magic");
 923         if (ret) {
 924                 goto end;
 925         }
 926
 927         ret = bt_ctf_field_type_structure_add_field(trace_packet_header_type,
 928                 uuid_array_type, "uuid");
 929         if (ret) {
 930                 goto end;
 931         }
 932
 933         ret = bt_ctf_field_type_structure_add_field(trace_packet_header_type,
 934                 _uint32_t, "stream_id");
 935         if (ret) {
 936                 goto end;
 937         }
 938
 939         ret = bt_ctf_trace_set_packet_header_type(trace,
 940                 trace_packet_header_type);
 941         if (ret) {
 942                 goto end;
 943         }
 944 end:
 945         bt_ctf_field_type_put(uuid_array_type);
 946         bt_ctf_field_type_put(_uint32_t);
 947         bt_ctf_field_type_put(_uint8_t);
 948         bt_ctf_field_put(magic);
 949         bt_ctf_field_put(uuid_array);
 950         bt_ctf_field_type_put(trace_packet_header_type);
 951
 952         return ret;
 953 }