formats/ctf/ctf.c

   1 /*
   2  * BabelTrace - Common Trace Format (CTF)
   3  *
   4  * Format registration.
   5  *
   6  * Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@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
  19 #include <babeltrace/format.h>
  20 #include <babeltrace/ctf/types.h>
  21 #include <babeltrace/ctf/metadata.h>
  22 #include <babeltrace/babeltrace.h>
  23 #include <inttypes.h>
  24 #include <stdio.h>
  25 #include <uuid/uuid.h>
  26 #include <sys/mman.h>
  27 #include <errno.h>
  28 #include <endian.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <fcntl.h>
  32 #include <dirent.h>
  33 #include <glib.h>
  34 #include <unistd.h>
  35 #include <stdlib.h>
  36
  37 #include "metadata/ctf-scanner.h"
  38 #include "metadata/ctf-parser.h"
  39 #include "metadata/ctf-ast.h"
  40
  41 /*
  42  * We currently simply map a page to read the packet header and packet
  43  * context to get the packet length and content length. (in bits)
  44  */
  45 #define MAX_PACKET_HEADER_LEN   (getpagesize() * CHAR_BIT)
  46 #define WRITE_PACKET_LEN        (getpagesize() * 8 * CHAR_BIT)
  47 #define UUID_LEN 16     /* uuid by value len */
  48
  49 #ifndef min
  50 #define min(a, b)       (((a) < (b)) ? (a) : (b))
  51 #endif
  52
  53 extern int yydebug;
  54
  55 static
  56 struct trace_descriptor *ctf_open_trace(const char *path, int flags);
  57 static
  58 void ctf_close_trace(struct trace_descriptor *descriptor);
  59
  60 static
  61 rw_dispatch read_dispatch_table[] = {
  62         [ CTF_TYPE_INTEGER ] = ctf_integer_read,
  63         [ CTF_TYPE_FLOAT ] = ctf_float_read,
  64         [ CTF_TYPE_ENUM ] = ctf_enum_read,
  65         [ CTF_TYPE_STRING ] = ctf_string_read,
  66         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  67         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  68         [ CTF_TYPE_ARRAY ] = ctf_array_read,
  69         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_read,
  70 };
  71
  72 static
  73 rw_dispatch write_dispatch_table[] = {
  74         [ CTF_TYPE_INTEGER ] = ctf_integer_write,
  75         [ CTF_TYPE_FLOAT ] = ctf_float_write,
  76         [ CTF_TYPE_ENUM ] = ctf_enum_write,
  77         [ CTF_TYPE_STRING ] = ctf_string_write,
  78         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  79         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  80         [ CTF_TYPE_ARRAY ] = ctf_array_write,
  81         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_write,
  82 };
  83
  84 static
  85 struct format ctf_format = {
  86         .open_trace = ctf_open_trace,
  87         .close_trace = ctf_close_trace,
  88 };
  89
  90 static
  91 void ctf_update_timestamp(struct ctf_stream *stream,
  92                           struct definition_integer *integer_definition)
  93 {
  94         struct declaration_integer *integer_declaration =
  95                 integer_definition->declaration;
  96         uint64_t oldval, newval, updateval;
  97
  98         if (integer_declaration->len == 64) {
  99                 stream->timestamp = integer_definition->value._unsigned;
 100                 return;
 101         }
 102         /* keep low bits */
 103         oldval = stream->timestamp;
 104         oldval &= (1ULL << integer_declaration->len) - 1;
 105         newval = integer_definition->value._unsigned;
 106         /* Test for overflow by comparing low bits */
 107         if (newval < oldval)
 108                 newval += 1ULL << integer_declaration->len;
 109         /* updateval contains old high bits, and new low bits (sum) */
 110         updateval = stream->timestamp;
 111         updateval &= ~((1ULL << integer_declaration->len) - 1);
 112         updateval += newval;
 113         stream->timestamp = updateval;
 114 }
 115
 116 static
 117 int ctf_read_event(struct stream_pos *ppos, struct ctf_stream *stream)
 118 {
 119         struct ctf_stream_pos *pos =
 120                 container_of(ppos, struct ctf_stream_pos, parent);
 121         struct ctf_stream_class *stream_class = stream->stream_class;
 122         struct ctf_stream_event *event;
 123         uint64_t id = 0;
 124         int ret;
 125
 126         if (pos->offset == EOF)
 127                 return EOF;
 128
 129         /* Read event header */
 130         if (stream->stream_event_header) {
 131                 struct definition_integer *integer_definition;
 132                 struct definition *variant;
 133
 134                 ret = generic_rw(ppos, &stream->stream_event_header->p);
 135                 if (ret)
 136                         goto error;
 137                 /* lookup event id */
 138                 integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
 139                 if (integer_definition) {
 140                         id = integer_definition->value._unsigned;
 141                 } else {
 142                         struct definition_enum *enum_definition;
 143
 144                         enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
 145                         if (enum_definition) {
 146                                 id = enum_definition->integer->value._unsigned;
 147                         }
 148                 }
 149
 150                 variant = lookup_variant(&stream->stream_event_header->p, "v");
 151                 if (variant) {
 152                         integer_definition = lookup_integer(variant, "id", FALSE);
 153                         if (integer_definition) {
 154                                 id = integer_definition->value._unsigned;
 155                         }
 156                 }
 157
 158                 /* lookup timestamp */
 159                 integer_definition = lookup_integer(&stream->stream_event_header->p, "timestamp", FALSE);
 160                 if (integer_definition) {
 161                         ctf_update_timestamp(stream, integer_definition);
 162                 } else {
 163                         if (variant) {
 164                                 integer_definition = lookup_integer(variant, "timestamp", FALSE);
 165                                 if (integer_definition) {
 166                                         ctf_update_timestamp(stream, integer_definition);
 167                                 }
 168                         }
 169                 }
 170         }
 171
 172         /* Read stream-declared event context */
 173         if (stream->stream_event_context) {
 174                 ret = generic_rw(ppos, &stream->stream_event_context->p);
 175                 if (ret)
 176                         goto error;
 177         }
 178
 179         if (id >= stream_class->events_by_id->len) {
 180                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 181                 return -EINVAL;
 182         }
 183         event = g_ptr_array_index(stream->events_by_id, id);
 184         if (!event) {
 185                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 186                 return -EINVAL;
 187         }
 188
 189         /* Read event-declared event context */
 190         if (event->event_context) {
 191                 ret = generic_rw(ppos, &event->event_context->p);
 192                 if (ret)
 193                         goto error;
 194         }
 195
 196         /* Read event payload */
 197         if (event->event_fields) {
 198                 ret = generic_rw(ppos, &event->event_fields->p);
 199                 if (ret)
 200                         goto error;
 201         }
 202
 203         return 0;
 204
 205 error:
 206         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 207         return ret;
 208 }
 209
 210 static
 211 int ctf_write_event(struct stream_pos *pos, struct ctf_stream *stream)
 212 {
 213         struct ctf_stream_class *stream_class = stream->stream_class;
 214         struct ctf_stream_event *event;
 215         uint64_t id = 0;
 216         int ret;
 217
 218         /* print event header */
 219         if (stream->stream_event_header) {
 220                 struct definition_integer *integer_definition;
 221                 struct definition *variant;
 222
 223                 /* lookup event id */
 224                 integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
 225                 if (integer_definition) {
 226                         id = integer_definition->value._unsigned;
 227                 } else {
 228                         struct definition_enum *enum_definition;
 229
 230                         enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
 231                         if (enum_definition) {
 232                                 id = enum_definition->integer->value._unsigned;
 233                         }
 234                 }
 235
 236                 variant = lookup_variant(&stream->stream_event_header->p, "v");
 237                 if (variant) {
 238                         integer_definition = lookup_integer(variant, "id", FALSE);
 239                         if (integer_definition) {
 240                                 id = integer_definition->value._unsigned;
 241                         }
 242                 }
 243
 244                 ret = generic_rw(pos, &stream->stream_event_header->p);
 245                 if (ret)
 246                         goto error;
 247         }
 248
 249         /* print stream-declared event context */
 250         if (stream->stream_event_context) {
 251                 ret = generic_rw(pos, &stream->stream_event_context->p);
 252                 if (ret)
 253                         goto error;
 254         }
 255
 256         if (id >= stream_class->events_by_id->len) {
 257                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 258                 return -EINVAL;
 259         }
 260         event = g_ptr_array_index(stream->events_by_id, id);
 261         if (!event) {
 262                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 263                 return -EINVAL;
 264         }
 265
 266         /* print event-declared event context */
 267         if (event->event_context) {
 268                 ret = generic_rw(pos, &event->event_context->p);
 269                 if (ret)
 270                         goto error;
 271         }
 272
 273         /* Read and print event payload */
 274         if (event->event_fields) {
 275                 ret = generic_rw(pos, &event->event_fields->p);
 276                 if (ret)
 277                         goto error;
 278         }
 279
 280         return 0;
 281
 282 error:
 283         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 284         return ret;
 285 }
 286
 287 void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
 288 {
 289         pos->fd = fd;
 290         pos->mmap_offset = 0;
 291         pos->packet_size = 0;
 292         pos->content_size = 0;
 293         pos->content_size_loc = NULL;
 294         pos->base = NULL;
 295         pos->offset = 0;
 296         pos->dummy = false;
 297         pos->cur_index = 0;
 298         if (fd >= 0)
 299                 pos->packet_index = g_array_new(FALSE, TRUE,
 300                                                 sizeof(struct packet_index));
 301         else
 302                 pos->packet_index = NULL;
 303         switch (open_flags & O_ACCMODE) {
 304         case O_RDONLY:
 305                 pos->prot = PROT_READ;
 306                 pos->flags = MAP_PRIVATE;
 307                 pos->parent.rw_table = read_dispatch_table;
 308                 pos->parent.event_cb = ctf_read_event;
 309                 break;
 310         case O_RDWR:
 311                 pos->prot = PROT_WRITE; /* Write has priority */
 312                 pos->flags = MAP_SHARED;
 313                 pos->parent.rw_table = write_dispatch_table;
 314                 pos->parent.event_cb = ctf_write_event;
 315                 if (fd >= 0)
 316                         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 317                 break;
 318         default:
 319                 assert(0);
 320         }
 321 }
 322
 323 void ctf_fini_pos(struct ctf_stream_pos *pos)
 324 {
 325         int ret;
 326
 327         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 328                 *pos->content_size_loc = pos->offset;
 329         if (pos->base) {
 330                 /* unmap old base */
 331                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 332                 if (ret) {
 333                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 334                                 strerror(errno));
 335                         assert(0);
 336                 }
 337         }
 338         (void) g_array_free(pos->packet_index, TRUE);
 339 }
 340
 341 void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence)
 342 {
 343         struct ctf_file_stream *file_stream =
 344                 container_of(pos, struct ctf_file_stream, pos);
 345         int ret;
 346         off_t off;
 347         struct packet_index *index;
 348
 349         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 350                 *pos->content_size_loc = pos->offset;
 351
 352         if (pos->base) {
 353                 /* unmap old base */
 354                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 355                 if (ret) {
 356                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 357                                 strerror(errno));
 358                         assert(0);
 359                 }
 360                 pos->base = NULL;
 361         }
 362
 363         /*
 364          * The caller should never ask for ctf_move_pos across packets,
 365          * except to get exactly at the beginning of the next packet.
 366          */
 367         if (pos->prot == PROT_WRITE) {
 368                 switch (whence) {
 369                 case SEEK_CUR:
 370                         /* The writer will add padding */
 371                         assert(pos->offset + offset == pos->packet_size);
 372                         pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
 373                         break;
 374                 case SEEK_SET:
 375                         assert(offset == 0);    /* only seek supported for now */
 376                         pos->cur_index = 0;
 377                         break;
 378                 default:
 379                         assert(0);
 380                 }
 381                 pos->content_size = -1U;        /* Unknown at this point */
 382                 pos->packet_size = WRITE_PACKET_LEN;
 383                 off = posix_fallocate(pos->fd, pos->mmap_offset,
 384                                       pos->packet_size / CHAR_BIT);
 385                 assert(off >= 0);
 386                 pos->offset = 0;
 387         } else {
 388                 switch (whence) {
 389                 case SEEK_CUR:
 390                         /* The reader will expect us to skip padding */
 391                         assert(pos->offset + offset == pos->content_size);
 392                         ++pos->cur_index;
 393                         break;
 394                 case SEEK_SET:
 395                         assert(offset == 0);    /* only seek supported for now */
 396                         pos->cur_index = 0;
 397                         break;
 398                 default:
 399                         assert(0);
 400                 }
 401                 if (pos->cur_index >= pos->packet_index->len) {
 402                         pos->offset = EOF;
 403                         return;
 404                 }
 405                 index = &g_array_index(pos->packet_index, struct packet_index,
 406                                        pos->cur_index);
 407                 pos->mmap_offset = index->offset;
 408
 409                 /* Lookup context/packet size in index */
 410                 file_stream->parent.timestamp = index->timestamp_begin;
 411                 pos->content_size = index->content_size;
 412                 pos->packet_size = index->packet_size;
 413                 if (index->data_offset < index->content_size)
 414                         pos->offset = 0;        /* will read headers */
 415                 else {
 416                         pos->offset = EOF;
 417                         return;
 418                 }
 419         }
 420         /* map new base. Need mapping length from header. */
 421         pos->base = mmap(NULL, pos->packet_size / CHAR_BIT, pos->prot,
 422                          pos->flags, pos->fd, pos->mmap_offset);
 423         if (pos->base == MAP_FAILED) {
 424                 fprintf(stdout, "[error] mmap error %s.\n",
 425                         strerror(errno));
 426                 assert(0);
 427         }
 428
 429         /* update trace_packet_header and stream_packet_context */
 430         if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
 431                 /* Read packet header */
 432                 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
 433                 assert(!ret);
 434         }
 435         if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
 436                 /* Read packet context */
 437                 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
 438                 assert(!ret);
 439         }
 440 }
 441
 442 static
 443 int packet_metadata(struct ctf_trace *td, FILE *fp)
 444 {
 445         uint32_t magic;
 446         size_t len;
 447         int ret = 0;
 448
 449         len = fread(&magic, sizeof(magic), 1, fp);
 450         if (len != 1) {
 451                 goto end;
 452         }
 453         if (magic == TSDL_MAGIC) {
 454                 ret = 1;
 455                 td->byte_order = BYTE_ORDER;
 456         } else if (magic == GUINT32_SWAP_LE_BE(TSDL_MAGIC)) {
 457                 ret = 1;
 458                 td->byte_order = (BYTE_ORDER == BIG_ENDIAN) ?
 459                                         LITTLE_ENDIAN : BIG_ENDIAN;
 460         }
 461         CTF_TRACE_SET_FIELD(td, byte_order);
 462 end:
 463         rewind(fp);
 464         return ret;
 465 }
 466
 467 static
 468 int ctf_open_trace_metadata_packet_read(struct ctf_trace *td, FILE *in,
 469                                         FILE *out)
 470 {
 471         struct metadata_packet_header header;
 472         size_t readlen, writelen, toread;
 473         char buf[4096];
 474         int ret = 0;
 475
 476         readlen = fread(&header, header_sizeof(header), 1, in);
 477         if (readlen < 1)
 478                 return -EINVAL;
 479
 480         if (td->byte_order != BYTE_ORDER) {
 481                 header.magic = GUINT32_SWAP_LE_BE(header.magic);
 482                 header.checksum = GUINT32_SWAP_LE_BE(header.checksum);
 483                 header.content_size = GUINT32_SWAP_LE_BE(header.content_size);
 484                 header.packet_size = GUINT32_SWAP_LE_BE(header.packet_size);
 485         }
 486         if (header.checksum)
 487                 fprintf(stdout, "[warning] checksum verification not supported yet.\n");
 488         if (header.compression_scheme) {
 489                 fprintf(stdout, "[error] compression (%u) not supported yet.\n",
 490                         header.compression_scheme);
 491                 return -EINVAL;
 492         }
 493         if (header.encryption_scheme) {
 494                 fprintf(stdout, "[error] encryption (%u) not supported yet.\n",
 495                         header.encryption_scheme);
 496                 return -EINVAL;
 497         }
 498         if (header.checksum_scheme) {
 499                 fprintf(stdout, "[error] checksum (%u) not supported yet.\n",
 500                         header.checksum_scheme);
 501                 return -EINVAL;
 502         }
 503         if (!CTF_TRACE_FIELD_IS_SET(td, uuid)) {
 504                 memcpy(td->uuid, header.uuid, sizeof(header.uuid));
 505                 CTF_TRACE_SET_FIELD(td, uuid);
 506         } else {
 507                 if (uuid_compare(header.uuid, td->uuid))
 508                         return -EINVAL;
 509         }
 510
 511         toread = (header.content_size / CHAR_BIT) - header_sizeof(header);
 512
 513         for (;;) {
 514                 readlen = fread(buf, sizeof(char), min(sizeof(buf), toread), in);
 515                 if (ferror(in)) {
 516                         ret = -EINVAL;
 517                         break;
 518                 }
 519                 if (babeltrace_debug) {
 520                         fprintf(stdout, "[debug] metadata packet read: %s\n",
 521                                 buf);
 522                 }
 523
 524                 writelen = fwrite(buf, sizeof(char), readlen, out);
 525                 if (writelen < readlen) {
 526                         ret = -EIO;
 527                         break;
 528                 }
 529                 if (ferror(out)) {
 530                         ret = -EINVAL;
 531                         break;
 532                 }
 533                 toread -= readlen;
 534                 if (!toread) {
 535                         ret = 0;        /* continue reading next packet */
 536                         break;
 537                 }
 538         }
 539         return ret;
 540 }
 541
 542 static
 543 int ctf_open_trace_metadata_stream_read(struct ctf_trace *td, FILE **fp,
 544                                         char **buf)
 545 {
 546         FILE *in, *out;
 547         size_t size;
 548         int ret;
 549
 550         in = *fp;
 551         /*
 552          * Using strlen on *buf instead of size of open_memstream
 553          * because its size includes garbage at the end (after final
 554          * \0). This is the allocated size, not the actual string size.
 555          */
 556         out = open_memstream(buf, &size);
 557         if (out == NULL)
 558                 return -errno;
 559
 560         for (;;) {
 561                 ret = ctf_open_trace_metadata_packet_read(td, in, out);
 562                 if (ret) {
 563                         break;
 564                 }
 565                 if (feof(in)) {
 566                         ret = 0;
 567                         break;
 568                 }
 569         }
 570         fclose(out);    /* flush the buffer */
 571         fclose(in);
 572         /* open for reading */
 573         *fp = fmemopen(*buf, strlen(*buf), "rb");
 574         return 0;
 575 }
 576
 577 static
 578 int ctf_open_trace_metadata_read(struct ctf_trace *td)
 579 {
 580         struct ctf_scanner *scanner;
 581         struct ctf_file_stream *metadata_stream;
 582         FILE *fp;
 583         char *buf = NULL;
 584         int ret = 0;
 585
 586         metadata_stream = g_new0(struct ctf_file_stream, 1);
 587         td->metadata = &metadata_stream->parent;
 588         metadata_stream->pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
 589         if (metadata_stream->pos.fd < 0) {
 590                 fprintf(stdout, "Unable to open metadata.\n");
 591                 return metadata_stream->pos.fd;
 592         }
 593
 594         if (babeltrace_debug)
 595                 yydebug = 1;
 596
 597         fp = fdopen(metadata_stream->pos.fd, "r");
 598         if (!fp) {
 599                 fprintf(stdout, "[error] Unable to open metadata stream.\n");
 600                 ret = -errno;
 601                 goto end_stream;
 602         }
 603
 604         if (packet_metadata(td, fp)) {
 605                 ret = ctf_open_trace_metadata_stream_read(td, &fp, &buf);
 606                 if (ret)
 607                         goto end_packet_read;
 608         }
 609
 610         scanner = ctf_scanner_alloc(fp);
 611         if (!scanner) {
 612                 fprintf(stdout, "[error] Error allocating scanner\n");
 613                 ret = -ENOMEM;
 614                 goto end_scanner_alloc;
 615         }
 616         ret = ctf_scanner_append_ast(scanner);
 617         if (ret) {
 618                 fprintf(stdout, "[error] Error creating AST\n");
 619                 goto end;
 620         }
 621
 622         if (babeltrace_debug) {
 623                 ret = ctf_visitor_print_xml(stdout, 0, &scanner->ast->root);
 624                 if (ret) {
 625                         fprintf(stdout, "[error] Error visiting AST for XML output\n");
 626                         goto end;
 627                 }
 628         }
 629
 630         ret = ctf_visitor_semantic_check(stdout, 0, &scanner->ast->root);
 631         if (ret) {
 632                 fprintf(stdout, "[error] Error in CTF semantic validation %d\n", ret);
 633                 goto end;
 634         }
 635         ret = ctf_visitor_construct_metadata(stdout, 0, &scanner->ast->root,
 636                         td, BYTE_ORDER);
 637         if (ret) {
 638                 fprintf(stdout, "[error] Error in CTF metadata constructor %d\n", ret);
 639                 goto end;
 640         }
 641 end:
 642         ctf_scanner_free(scanner);
 643 end_scanner_alloc:
 644 end_packet_read:
 645         fclose(fp);
 646         free(buf);
 647 end_stream:
 648         close(metadata_stream->pos.fd);
 649         if (ret)
 650                 g_free(metadata_stream);
 651         return ret;
 652 }
 653
 654 static
 655 struct ctf_stream_event *create_event_definitions(struct ctf_trace *td,
 656                                                   struct ctf_stream *stream,
 657                                                   struct ctf_event *event)
 658 {
 659         struct ctf_stream_event *stream_event = g_new0(struct ctf_stream_event, 1);
 660
 661         if (event->context_decl) {
 662                 struct definition *definition =
 663                         event->context_decl->p.definition_new(&event->context_decl->p,
 664                                 stream->parent_def_scope, 0, 0, "event.context");
 665                 if (!definition) {
 666                         goto error;
 667                 }
 668                 stream_event->event_context = container_of(definition,
 669                                         struct definition_struct, p);
 670                 stream->parent_def_scope = stream_event->event_context->p.scope;
 671         }
 672         if (event->fields_decl) {
 673                 struct definition *definition =
 674                         event->fields_decl->p.definition_new(&event->fields_decl->p,
 675                                 stream->parent_def_scope, 0, 0, "event.fields");
 676                 if (!definition) {
 677                         goto error;
 678                 }
 679                 stream_event->event_fields = container_of(definition,
 680                                         struct definition_struct, p);
 681                 stream->parent_def_scope = stream_event->event_fields->p.scope;
 682         }
 683         return stream_event;
 684
 685 error:
 686         if (stream_event->event_fields)
 687                 definition_unref(&stream_event->event_fields->p);
 688         if (stream_event->event_context)
 689                 definition_unref(&stream_event->event_context->p);
 690         return NULL;
 691 }
 692
 693 static
 694 int create_stream_definitions(struct ctf_trace *td, struct ctf_stream *stream)
 695 {
 696         struct ctf_stream_class *stream_class;
 697         int ret;
 698         int i;
 699
 700         if (stream->stream_definitions_created)
 701                 return 0;
 702
 703         stream_class = stream->stream_class;
 704
 705         if (stream_class->packet_context_decl) {
 706                 struct definition *definition =
 707                         stream_class->packet_context_decl->p.definition_new(&stream_class->packet_context_decl->p,
 708                                 stream->parent_def_scope, 0, 0, "stream.packet.context");
 709                 if (!definition) {
 710                         ret = -EINVAL;
 711                         goto error;
 712                 }
 713                 stream->stream_packet_context = container_of(definition,
 714                                                 struct definition_struct, p);
 715                 stream->parent_def_scope = stream->stream_packet_context->p.scope;
 716         }
 717         if (stream_class->event_header_decl) {
 718                 struct definition *definition =
 719                         stream_class->event_header_decl->p.definition_new(&stream_class->event_header_decl->p,
 720                                 stream->parent_def_scope, 0, 0, "stream.event.header");
 721                 if (!definition) {
 722                         ret = -EINVAL;
 723                         goto error;
 724                 }
 725                 stream->stream_event_header =
 726                         container_of(definition, struct definition_struct, p);
 727                 stream->parent_def_scope = stream->stream_event_header->p.scope;
 728         }
 729         if (stream_class->event_context_decl) {
 730                 struct definition *definition =
 731                         stream_class->event_context_decl->p.definition_new(&stream_class->event_context_decl->p,
 732                                 stream->parent_def_scope, 0, 0, "stream.event.context");
 733                 if (!definition) {
 734                         ret = -EINVAL;
 735                         goto error;
 736                 }
 737                 stream->stream_event_context =
 738                         container_of(definition, struct definition_struct, p);
 739                 stream->parent_def_scope = stream->stream_event_context->p.scope;
 740         }
 741         stream->events_by_id = g_ptr_array_new();
 742         g_ptr_array_set_size(stream->events_by_id, stream_class->events_by_id->len);
 743         for (i = 0; i < stream->events_by_id->len; i++) {
 744                 struct ctf_event *event = g_ptr_array_index(stream_class->events_by_id, i);
 745                 struct ctf_stream_event *stream_event;
 746
 747                 if (!event)
 748                         continue;
 749                 stream_event = create_event_definitions(td, stream, event);
 750                 if (!stream_event)
 751                         goto error_event;
 752                 g_ptr_array_index(stream->events_by_id, i) = stream_event;
 753         }
 754         return 0;
 755
 756 error_event:
 757         for (i = 0; i < stream->events_by_id->len; i++) {
 758                 struct ctf_stream_event *stream_event = g_ptr_array_index(stream->events_by_id, i);
 759                 if (stream_event)
 760                         g_free(stream_event);
 761         }
 762         g_ptr_array_free(stream->events_by_id, TRUE);
 763 error:
 764         if (stream->stream_event_context)
 765                 definition_unref(&stream->stream_event_context->p);
 766         if (stream->stream_event_header)
 767                 definition_unref(&stream->stream_event_header->p);
 768         if (stream->stream_packet_context)
 769                 definition_unref(&stream->stream_packet_context->p);
 770         return ret;
 771 }
 772
 773
 774 static
 775 int create_stream_packet_index(struct ctf_trace *td,
 776                                struct ctf_file_stream *file_stream)
 777 {
 778         struct ctf_stream_class *stream;
 779         int len_index;
 780         struct ctf_stream_pos *pos;
 781         struct stat filestats;
 782         struct packet_index packet_index;
 783         int first_packet = 1;
 784         int ret;
 785
 786         pos = &file_stream->pos;
 787
 788         ret = fstat(pos->fd, &filestats);
 789         if (ret < 0)
 790                 return ret;
 791
 792         if (filestats.st_size < MAX_PACKET_HEADER_LEN / CHAR_BIT)
 793                 return -EINVAL;
 794
 795         for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
 796                 uint64_t stream_id = 0;
 797
 798                 if (pos->base) {
 799                         /* unmap old base */
 800                         ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 801                         if (ret) {
 802                                 fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 803                                         strerror(errno));
 804                                 return ret;
 805                         }
 806                         pos->base = NULL;
 807                 }
 808                 /* map new base. Need mapping length from header. */
 809                 pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
 810                                  MAP_PRIVATE, pos->fd, pos->mmap_offset);
 811                 pos->content_size = MAX_PACKET_HEADER_LEN;      /* Unknown at this point */
 812                 pos->packet_size = MAX_PACKET_HEADER_LEN;       /* Unknown at this point */
 813                 pos->offset = 0;        /* Position of the packet header */
 814
 815                 packet_index.offset = pos->mmap_offset;
 816                 packet_index.content_size = 0;
 817                 packet_index.packet_size = 0;
 818                 packet_index.timestamp_begin = 0;
 819                 packet_index.timestamp_end = 0;
 820
 821                 /* read and check header, set stream id (and check) */
 822                 if (file_stream->parent.trace_packet_header) {
 823                         /* Read packet header */
 824                         ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
 825                         if (ret)
 826                                 return ret;
 827                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("magic"));
 828                         if (len_index >= 0) {
 829                                 struct definition_integer *defint;
 830                                 struct definition *field;
 831
 832                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
 833                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 834                                 defint = container_of(field, struct definition_integer, p);
 835                                 assert(defint->declaration->signedness == FALSE);
 836                                 if (defint->value._unsigned != CTF_MAGIC) {
 837                                         fprintf(stdout, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
 838                                                         defint->value._unsigned,
 839                                                         file_stream->pos.packet_index->len,
 840                                                         (ssize_t) pos->mmap_offset);
 841                                         return -EINVAL;
 842                                 }
 843                         }
 844
 845                         /* check uuid */
 846                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("uuid"));
 847                         if (len_index >= 0) {
 848                                 struct definition_array *defarray;
 849                                 struct definition *field;
 850                                 uint64_t i;
 851                                 uint8_t uuidval[UUID_LEN];
 852
 853                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
 854                                 assert(field->declaration->id == CTF_TYPE_ARRAY);
 855                                 defarray = container_of(field, struct definition_array, p);
 856                                 assert(array_len(defarray) == UUID_LEN);
 857                                 assert(defarray->declaration->elem->id == CTF_TYPE_INTEGER);
 858
 859                                 for (i = 0; i < UUID_LEN; i++) {
 860                                         struct definition *elem;
 861                                         struct definition_integer *defint;
 862
 863                                         elem = array_index(defarray, i);
 864                                         assert(elem);
 865                                         defint = container_of(elem, struct definition_integer, p);
 866                                         uuidval[i] = defint->value._unsigned;
 867                                 }
 868                                 ret = uuid_compare(td->uuid, uuidval);
 869                                 if (ret) {
 870                                         fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
 871                                         return -EINVAL;
 872                                 }
 873                         }
 874
 875
 876                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("stream_id"));
 877                         if (len_index >= 0) {
 878                                 struct definition_integer *defint;
 879                                 struct definition *field;
 880
 881                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
 882                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 883                                 defint = container_of(field, struct definition_integer, p);
 884                                 assert(defint->declaration->signedness == FALSE);
 885                                 stream_id = defint->value._unsigned;
 886                         }
 887                 }
 888
 889                 if (!first_packet && file_stream->parent.stream_id != stream_id) {
 890                         fprintf(stdout, "[error] Stream ID is changing within a stream.\n");
 891                         return -EINVAL;
 892                 }
 893                 if (first_packet) {
 894                         file_stream->parent.stream_id = stream_id;
 895                         if (stream_id >= td->streams->len) {
 896                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 897                                 return -EINVAL;
 898                         }
 899                         stream = g_ptr_array_index(td->streams, stream_id);
 900                         if (!stream) {
 901                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 902                                 return -EINVAL;
 903                         }
 904                         file_stream->parent.stream_class = stream;
 905                 }
 906                 first_packet = 0;
 907
 908                 ret = create_stream_definitions(td, &file_stream->parent);
 909                 if (ret)
 910                         return ret;
 911
 912                 if (file_stream->parent.stream_packet_context) {
 913                         /* Read packet context */
 914                         ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
 915                         if (ret)
 916                                 return ret;
 917                         /* read content size from header */
 918                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("content_size"));
 919                         if (len_index >= 0) {
 920                                 struct definition_integer *defint;
 921                                 struct definition *field;
 922
 923                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 924                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 925                                 defint = container_of(field, struct definition_integer, p);
 926                                 assert(defint->declaration->signedness == FALSE);
 927                                 packet_index.content_size = defint->value._unsigned;
 928                         } else {
 929                                 /* Use file size for packet size */
 930                                 packet_index.content_size = filestats.st_size * CHAR_BIT;
 931                         }
 932
 933                         /* read packet size from header */
 934                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("packet_size"));
 935                         if (len_index >= 0) {
 936                                 struct definition_integer *defint;
 937                                 struct definition *field;
 938
 939                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 940                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 941                                 defint = container_of(field, struct definition_integer, p);
 942                                 assert(defint->declaration->signedness == FALSE);
 943                                 packet_index.packet_size = defint->value._unsigned;
 944                         } else {
 945                                 /* Use content size if non-zero, else file size */
 946                                 packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 947                         }
 948
 949                         /* read timestamp begin from header */
 950                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("timestamp_begin"));
 951                         if (len_index >= 0) {
 952                                 struct definition_integer *defint;
 953                                 struct definition *field;
 954
 955                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 956                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 957                                 defint = container_of(field, struct definition_integer, p);
 958                                 assert(defint->declaration->signedness == FALSE);
 959                                 packet_index.timestamp_begin = defint->value._unsigned;
 960                         }
 961
 962                         /* read timestamp end from header */
 963                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("timestamp_end"));
 964                         if (len_index >= 0) {
 965                                 struct definition_integer *defint;
 966                                 struct definition *field;
 967
 968                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 969                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 970                                 defint = container_of(field, struct definition_integer, p);
 971                                 assert(defint->declaration->signedness == FALSE);
 972                                 packet_index.timestamp_end = defint->value._unsigned;
 973                         }
 974                 } else {
 975                         /* Use file size for packet size */
 976                         packet_index.content_size = filestats.st_size * CHAR_BIT;
 977                         /* Use content size if non-zero, else file size */
 978                         packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 979                 }
 980
 981                 /* Validate content size and packet size values */
 982                 if (packet_index.content_size > packet_index.packet_size) {
 983                         fprintf(stdout, "[error] Content size (%zu bits) is larger than packet size (%zu bits).\n",
 984                                 packet_index.content_size, packet_index.packet_size);
 985                         return -EINVAL;
 986                 }
 987
 988                 if (packet_index.packet_size > (filestats.st_size - packet_index.offset) * CHAR_BIT) {
 989                         fprintf(stdout, "[error] Packet size (%zu bits) is larger than remaining file size (%zu bits).\n",
 990                                 packet_index.content_size, (size_t) (filestats.st_size - packet_index.offset) * CHAR_BIT);
 991                         return -EINVAL;
 992                 }
 993
 994                 /* Save position after header and context */
 995                 packet_index.data_offset = pos->offset;
 996
 997                 /* add index to packet array */
 998                 g_array_append_val(file_stream->pos.packet_index, packet_index);
 999
1000                 pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
1001         }
1002
1003         /* Move pos back to beginning of file */
1004         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
1005
1006         return 0;
1007 }
1008
1009 static
1010 int create_trace_definitions(struct ctf_trace *td, struct ctf_stream *stream)
1011 {
1012         int ret;
1013
1014         if (td->packet_header_decl) {
1015                 struct definition *definition =
1016                         td->packet_header_decl->p.definition_new(&td->packet_header_decl->p,
1017                                 stream->parent_def_scope, 0, 0, "trace.packet.header");
1018                 if (!definition) {
1019                         ret = -EINVAL;
1020                         goto error;
1021                 }
1022                 stream->trace_packet_header =
1023                         container_of(definition, struct definition_struct, p);
1024                 stream->parent_def_scope = stream->trace_packet_header->p.scope;
1025         }
1026
1027         return 0;
1028
1029 error:
1030         return ret;
1031 }
1032
1033 /*
1034  * Note: many file streams can inherit from the same stream class
1035  * description (metadata).
1036  */
1037 static
1038 int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags)
1039 {
1040         int ret;
1041         struct ctf_file_stream *file_stream;
1042
1043         ret = openat(td->dirfd, path, flags);
1044         if (ret < 0)
1045                 goto error;
1046         file_stream = g_new0(struct ctf_file_stream, 1);
1047         ctf_init_pos(&file_stream->pos, ret, flags);
1048         ret = create_trace_definitions(td, &file_stream->parent);
1049         if (ret)
1050                 goto error_def;
1051         ret = create_stream_packet_index(td, file_stream);
1052         if (ret)
1053                 goto error_index;
1054         /* Add stream file to stream class */
1055         g_ptr_array_add(file_stream->parent.stream_class->streams,
1056                         &file_stream->parent);
1057         return 0;
1058
1059 error_index:
1060         if (file_stream->parent.trace_packet_header)
1061                 definition_unref(&file_stream->parent.trace_packet_header->p);
1062 error_def:
1063         ctf_fini_pos(&file_stream->pos);
1064         close(file_stream->pos.fd);
1065         g_free(file_stream);
1066 error:
1067         return ret;
1068 }
1069
1070 static
1071 int ctf_open_trace_read(struct ctf_trace *td, const char *path, int flags)
1072 {
1073         int ret;
1074         struct dirent *dirent;
1075         struct dirent *diriter;
1076         size_t dirent_len;
1077
1078         td->flags = flags;
1079
1080         /* Open trace directory */
1081         td->dir = opendir(path);
1082         if (!td->dir) {
1083                 fprintf(stdout, "[error] Unable to open trace directory.\n");
1084                 ret = -ENOENT;
1085                 goto error;
1086         }
1087
1088         td->dirfd = open(path, 0);
1089         if (td->dirfd < 0) {
1090                 fprintf(stdout, "[error] Unable to open trace directory file descriptor.\n");
1091                 ret = -ENOENT;
1092                 goto error_dirfd;
1093         }
1094
1095         /*
1096          * Keep the metadata file separate.
1097          */
1098
1099         ret = ctf_open_trace_metadata_read(td);
1100         if (ret) {
1101                 goto error_metadata;
1102         }
1103
1104         /*
1105          * Open each stream: for each file, try to open, check magic
1106          * number, and get the stream ID to add to the right location in
1107          * the stream array.
1108          */
1109
1110         dirent_len = offsetof(struct dirent, d_name) +
1111                         fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
1112
1113         dirent = malloc(dirent_len);
1114
1115         for (;;) {
1116                 ret = readdir_r(td->dir, dirent, &diriter);
1117                 if (ret) {
1118                         fprintf(stdout, "[error] Readdir error.\n");
1119                         goto readdir_error;
1120                 }
1121                 if (!diriter)
1122                         break;
1123                 /* Ignore hidden files, ., .. and metadata. */
1124                 if (!strncmp(diriter->d_name, ".", 1)
1125                                 || !strcmp(diriter->d_name, "..")
1126                                 || !strcmp(diriter->d_name, "metadata"))
1127                         continue;
1128                 ret = ctf_open_file_stream_read(td, diriter->d_name, flags);
1129                 if (ret) {
1130                         fprintf(stdout, "[error] Open file stream error.\n");
1131                         goto readdir_error;
1132                 }
1133         }
1134
1135         free(dirent);
1136         return 0;
1137
1138 readdir_error:
1139         free(dirent);
1140 error_metadata:
1141         close(td->dirfd);
1142 error_dirfd:
1143         closedir(td->dir);
1144 error:
1145         return ret;
1146 }
1147
1148 static
1149 struct trace_descriptor *ctf_open_trace(const char *path, int flags)
1150 {
1151         struct ctf_trace *td;
1152         int ret;
1153
1154         td = g_new0(struct ctf_trace, 1);
1155
1156         switch (flags & O_ACCMODE) {
1157         case O_RDONLY:
1158                 if (!path) {
1159                         fprintf(stdout, "[error] Path missing for input CTF trace.\n");
1160                         goto error;
1161                 }
1162                 ret = ctf_open_trace_read(td, path, flags);
1163                 if (ret)
1164                         goto error;
1165                 break;
1166         case O_RDWR:
1167                 fprintf(stdout, "[error] Opening CTF traces for output is not supported yet.\n");
1168                 goto error;
1169         default:
1170                 fprintf(stdout, "[error] Incorrect open flags.\n");
1171                 goto error;
1172         }
1173
1174         return &td->parent;
1175 error:
1176         g_free(td);
1177         return NULL;
1178 }
1179
1180 static
1181 void ctf_close_file_stream(struct ctf_file_stream *file_stream)
1182 {
1183         ctf_fini_pos(&file_stream->pos);
1184         close(file_stream->pos.fd);
1185 }
1186
1187 static
1188 void ctf_close_trace(struct trace_descriptor *tdp)
1189 {
1190         struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
1191         int i;
1192
1193         if (td->streams) {
1194                 for (i = 0; i < td->streams->len; i++) {
1195                         struct ctf_stream_class *stream;
1196                         int j;
1197
1198                         stream = g_ptr_array_index(td->streams, i);
1199                         if (!stream)
1200                                 continue;
1201                         for (j = 0; j < stream->streams->len; j++) {
1202                                 struct ctf_file_stream *file_stream;
1203                                 file_stream = container_of(g_ptr_array_index(stream->streams, j), struct ctf_file_stream, parent);
1204                                 ctf_close_file_stream(file_stream);
1205                         }
1206
1207                 }
1208                 g_ptr_array_free(td->streams, TRUE);
1209         }
1210         closedir(td->dir);
1211         g_free(td);
1212 }
1213
1214 void __attribute__((constructor)) ctf_init(void)
1215 {
1216         int ret;
1217
1218         ctf_format.name = g_quark_from_static_string("ctf");
1219         ret = bt_register_format(&ctf_format);
1220         assert(!ret);
1221 }
1222
1223 /* TODO: finalize */