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