formats/ctf/ctf.c

   1 /*
   2  * BabelTrace - Common Trace Format (CTF)
   3  *
   4  * Format registration.
   5  *
   6  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   7  *
   8  * Author: Mathieu Desnoyers <mathieu.desnoyers@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
  21 #include <babeltrace/format.h>
  22 #include <babeltrace/ctf/types.h>
  23 #include <babeltrace/ctf/metadata.h>
  24 #include <babeltrace/babeltrace-internal.h>
  25 #include <inttypes.h>
  26 #include <stdio.h>
  27 #include <uuid/uuid.h>
  28 #include <sys/mman.h>
  29 #include <errno.h>
  30 #include <endian.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <fcntl.h>
  34 #include <dirent.h>
  35 #include <glib.h>
  36 #include <unistd.h>
  37 #include <stdlib.h>
  38
  39 #include "metadata/ctf-scanner.h"
  40 #include "metadata/ctf-parser.h"
  41 #include "metadata/ctf-ast.h"
  42
  43 /*
  44  * We currently simply map a page to read the packet header and packet
  45  * context to get the packet length and content length. (in bits)
  46  */
  47 #define MAX_PACKET_HEADER_LEN   (getpagesize() * CHAR_BIT)
  48 #define WRITE_PACKET_LEN        (getpagesize() * 8 * CHAR_BIT)
  49 #define UUID_LEN 16     /* uuid by value len */
  50
  51 #ifndef min
  52 #define min(a, b)       (((a) < (b)) ? (a) : (b))
  53 #endif
  54
  55 extern int yydebug;
  56
  57 static
  58 struct trace_descriptor *ctf_open_trace(const char *path, int flags);
  59 static
  60 void ctf_close_trace(struct trace_descriptor *descriptor);
  61
  62 static
  63 rw_dispatch read_dispatch_table[] = {
  64         [ CTF_TYPE_INTEGER ] = ctf_integer_read,
  65         [ CTF_TYPE_FLOAT ] = ctf_float_read,
  66         [ CTF_TYPE_ENUM ] = ctf_enum_read,
  67         [ CTF_TYPE_STRING ] = ctf_string_read,
  68         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  69         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  70         [ CTF_TYPE_ARRAY ] = ctf_array_read,
  71         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_read,
  72 };
  73
  74 static
  75 rw_dispatch write_dispatch_table[] = {
  76         [ CTF_TYPE_INTEGER ] = ctf_integer_write,
  77         [ CTF_TYPE_FLOAT ] = ctf_float_write,
  78         [ CTF_TYPE_ENUM ] = ctf_enum_write,
  79         [ CTF_TYPE_STRING ] = ctf_string_write,
  80         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  81         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  82         [ CTF_TYPE_ARRAY ] = ctf_array_write,
  83         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_write,
  84 };
  85
  86 static
  87 struct format ctf_format = {
  88         .open_trace = ctf_open_trace,
  89         .close_trace = ctf_close_trace,
  90 };
  91
  92 static
  93 void ctf_update_timestamp(struct ctf_stream *stream,
  94                           struct definition_integer *integer_definition)
  95 {
  96         struct declaration_integer *integer_declaration =
  97                 integer_definition->declaration;
  98         uint64_t oldval, newval, updateval;
  99
 100         if (unlikely(integer_declaration->len == 64)) {
 101                 stream->timestamp = integer_definition->value._unsigned;
 102                 return;
 103         }
 104         /* keep low bits */
 105         oldval = stream->timestamp;
 106         oldval &= (1ULL << integer_declaration->len) - 1;
 107         newval = integer_definition->value._unsigned;
 108         /* Test for overflow by comparing low bits */
 109         if (newval < oldval)
 110                 newval += 1ULL << integer_declaration->len;
 111         /* updateval contains old high bits, and new low bits (sum) */
 112         updateval = stream->timestamp;
 113         updateval &= ~((1ULL << integer_declaration->len) - 1);
 114         updateval += newval;
 115         stream->timestamp = updateval;
 116 }
 117
 118 static
 119 int ctf_read_event(struct stream_pos *ppos, struct ctf_stream *stream)
 120 {
 121         struct ctf_stream_pos *pos =
 122                 container_of(ppos, struct ctf_stream_pos, parent);
 123         struct ctf_stream_class *stream_class = stream->stream_class;
 124         struct ctf_stream_event *event;
 125         uint64_t id = 0;
 126         int ret;
 127
 128         ctf_pos_get_event(pos);
 129
 130         if (unlikely(pos->offset == EOF))
 131                 return EOF;
 132         assert(pos->offset < pos->content_size);
 133
 134         /* Read event header */
 135         if (likely(stream->stream_event_header)) {
 136                 struct definition_integer *integer_definition;
 137                 struct definition *variant;
 138
 139                 ret = generic_rw(ppos, &stream->stream_event_header->p);
 140                 if (unlikely(ret))
 141                         goto error;
 142                 /* lookup event id */
 143                 integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
 144                 if (integer_definition) {
 145                         id = integer_definition->value._unsigned;
 146                 } else {
 147                         struct definition_enum *enum_definition;
 148
 149                         enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
 150                         if (enum_definition) {
 151                                 id = enum_definition->integer->value._unsigned;
 152                         }
 153                 }
 154
 155                 variant = lookup_variant(&stream->stream_event_header->p, "v");
 156                 if (variant) {
 157                         integer_definition = lookup_integer(variant, "id", FALSE);
 158                         if (integer_definition) {
 159                                 id = integer_definition->value._unsigned;
 160                         }
 161                 }
 162                 stream->event_id = id;
 163
 164                 /* lookup timestamp */
 165                 stream->has_timestamp = 0;
 166                 integer_definition = lookup_integer(&stream->stream_event_header->p, "timestamp", FALSE);
 167                 if (integer_definition) {
 168                         ctf_update_timestamp(stream, integer_definition);
 169                         stream->has_timestamp = 1;
 170                 } else {
 171                         if (variant) {
 172                                 integer_definition = lookup_integer(variant, "timestamp", FALSE);
 173                                 if (integer_definition) {
 174                                         ctf_update_timestamp(stream, integer_definition);
 175                                         stream->has_timestamp = 1;
 176                                 }
 177                         }
 178                 }
 179         }
 180
 181         /* Read stream-declared event context */
 182         if (stream->stream_event_context) {
 183                 ret = generic_rw(ppos, &stream->stream_event_context->p);
 184                 if (ret)
 185                         goto error;
 186         }
 187
 188         if (unlikely(id >= stream_class->events_by_id->len)) {
 189                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 190                 return -EINVAL;
 191         }
 192         event = g_ptr_array_index(stream->events_by_id, id);
 193         if (unlikely(!event)) {
 194                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 195                 return -EINVAL;
 196         }
 197
 198         /* Read event-declared event context */
 199         if (event->event_context) {
 200                 ret = generic_rw(ppos, &event->event_context->p);
 201                 if (ret)
 202                         goto error;
 203         }
 204
 205         /* Read event payload */
 206         if (likely(event->event_fields)) {
 207                 ret = generic_rw(ppos, &event->event_fields->p);
 208                 if (ret)
 209                         goto error;
 210         }
 211
 212         return 0;
 213
 214 error:
 215         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 216         return ret;
 217 }
 218
 219 static
 220 int ctf_write_event(struct stream_pos *pos, struct ctf_stream *stream)
 221 {
 222         struct ctf_stream_class *stream_class = stream->stream_class;
 223         struct ctf_stream_event *event;
 224         uint64_t id;
 225         int ret;
 226
 227         id = stream->event_id;
 228
 229         /* print event header */
 230         if (likely(stream->stream_event_header)) {
 231                 ret = generic_rw(pos, &stream->stream_event_header->p);
 232                 if (ret)
 233                         goto error;
 234         }
 235
 236         /* print stream-declared event context */
 237         if (stream->stream_event_context) {
 238                 ret = generic_rw(pos, &stream->stream_event_context->p);
 239                 if (ret)
 240                         goto error;
 241         }
 242
 243         if (unlikely(id >= stream_class->events_by_id->len)) {
 244                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 245                 return -EINVAL;
 246         }
 247         event = g_ptr_array_index(stream->events_by_id, id);
 248         if (unlikely(!event)) {
 249                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 250                 return -EINVAL;
 251         }
 252
 253         /* print event-declared event context */
 254         if (event->event_context) {
 255                 ret = generic_rw(pos, &event->event_context->p);
 256                 if (ret)
 257                         goto error;
 258         }
 259
 260         /* Read and print event payload */
 261         if (likely(event->event_fields)) {
 262                 ret = generic_rw(pos, &event->event_fields->p);
 263                 if (ret)
 264                         goto error;
 265         }
 266
 267         return 0;
 268
 269 error:
 270         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 271         return ret;
 272 }
 273
 274 void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
 275 {
 276         pos->fd = fd;
 277         pos->mmap_offset = 0;
 278         pos->packet_size = 0;
 279         pos->content_size = 0;
 280         pos->content_size_loc = NULL;
 281         pos->base = NULL;
 282         pos->offset = 0;
 283         pos->dummy = false;
 284         pos->cur_index = 0;
 285         if (fd >= 0)
 286                 pos->packet_index = g_array_new(FALSE, TRUE,
 287                                                 sizeof(struct packet_index));
 288         else
 289                 pos->packet_index = NULL;
 290         switch (open_flags & O_ACCMODE) {
 291         case O_RDONLY:
 292                 pos->prot = PROT_READ;
 293                 pos->flags = MAP_PRIVATE;
 294                 pos->parent.rw_table = read_dispatch_table;
 295                 pos->parent.event_cb = ctf_read_event;
 296                 break;
 297         case O_RDWR:
 298                 pos->prot = PROT_WRITE; /* Write has priority */
 299                 pos->flags = MAP_SHARED;
 300                 pos->parent.rw_table = write_dispatch_table;
 301                 pos->parent.event_cb = ctf_write_event;
 302                 if (fd >= 0)
 303                         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 304                 break;
 305         default:
 306                 assert(0);
 307         }
 308 }
 309
 310 void ctf_fini_pos(struct ctf_stream_pos *pos)
 311 {
 312         int ret;
 313
 314         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 315                 *pos->content_size_loc = pos->offset;
 316         if (pos->base) {
 317                 /* unmap old base */
 318                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 319                 if (ret) {
 320                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 321                                 strerror(errno));
 322                         assert(0);
 323                 }
 324         }
 325         (void) g_array_free(pos->packet_index, TRUE);
 326 }
 327
 328 void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence)
 329 {
 330         struct ctf_file_stream *file_stream =
 331                 container_of(pos, struct ctf_file_stream, pos);
 332         int ret;
 333         off_t off;
 334         struct packet_index *index;
 335
 336         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 337                 *pos->content_size_loc = pos->offset;
 338
 339         if (pos->base) {
 340                 /* unmap old base */
 341                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 342                 if (ret) {
 343                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 344                                 strerror(errno));
 345                         assert(0);
 346                 }
 347                 pos->base = NULL;
 348         }
 349
 350         /*
 351          * The caller should never ask for ctf_move_pos across packets,
 352          * except to get exactly at the beginning of the next packet.
 353          */
 354         if (pos->prot == PROT_WRITE) {
 355                 switch (whence) {
 356                 case SEEK_CUR:
 357                         /* The writer will add padding */
 358                         assert(pos->offset + offset == pos->packet_size);
 359                         pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
 360                         break;
 361                 case SEEK_SET:
 362                         assert(offset == 0);    /* only seek supported for now */
 363                         pos->cur_index = 0;
 364                         break;
 365                 default:
 366                         assert(0);
 367                 }
 368                 pos->content_size = -1U;        /* Unknown at this point */
 369                 pos->packet_size = WRITE_PACKET_LEN;
 370                 off = posix_fallocate(pos->fd, pos->mmap_offset,
 371                                       pos->packet_size / CHAR_BIT);
 372                 assert(off >= 0);
 373                 pos->offset = 0;
 374         } else {
 375         read_next_packet:
 376                 switch (whence) {
 377                 case SEEK_CUR:
 378                         if (pos->offset == EOF)
 379                                 return;
 380                         /* The reader will expect us to skip padding */
 381                         assert(pos->offset + offset == pos->content_size);
 382                         ++pos->cur_index;
 383                         break;
 384                 case SEEK_SET:
 385                         assert(offset == 0);    /* only seek supported for now */
 386                         pos->cur_index = 0;
 387                         break;
 388                 default:
 389                         assert(0);
 390                 }
 391                 if (pos->cur_index >= pos->packet_index->len) {
 392                         pos->offset = EOF;
 393                         return;
 394                 }
 395                 index = &g_array_index(pos->packet_index, struct packet_index,
 396                                        pos->cur_index);
 397                 pos->mmap_offset = index->offset;
 398
 399                 /* Lookup context/packet size in index */
 400                 file_stream->parent.timestamp = index->timestamp_begin;
 401                 pos->content_size = index->content_size;
 402                 pos->packet_size = index->packet_size;
 403                 if (index->data_offset < index->content_size) {
 404                         pos->offset = 0;        /* will read headers */
 405                 } else if (index->data_offset == index->content_size) {
 406                         /* empty packet */
 407                         pos->offset = index->data_offset;
 408                         offset = 0;
 409                         goto read_next_packet;
 410                 } else {
 411                         pos->offset = EOF;
 412                         return;
 413                 }
 414         }
 415         /* map new base. Need mapping length from header. */
 416         pos->base = mmap(NULL, pos->packet_size / CHAR_BIT, pos->prot,
 417                          pos->flags, pos->fd, pos->mmap_offset);
 418         if (pos->base == MAP_FAILED) {
 419                 fprintf(stdout, "[error] mmap error %s.\n",
 420                         strerror(errno));
 421                 assert(0);
 422         }
 423
 424         /* update trace_packet_header and stream_packet_context */
 425         if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
 426                 /* Read packet header */
 427                 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
 428                 assert(!ret);
 429         }
 430         if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
 431                 /* Read packet context */
 432                 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
 433                 assert(!ret);
 434         }
 435 }
 436
 437 static
 438 int packet_metadata(struct ctf_trace *td, FILE *fp)
 439 {
 440         uint32_t magic;
 441         size_t len;
 442         int ret = 0;
 443
 444         len = fread(&magic, sizeof(magic), 1, fp);
 445         if (len != 1) {
 446                 goto end;
 447         }
 448         if (magic == TSDL_MAGIC) {
 449                 ret = 1;
 450                 td->byte_order = BYTE_ORDER;
 451                 CTF_TRACE_SET_FIELD(td, byte_order);
 452         } else if (magic == GUINT32_SWAP_LE_BE(TSDL_MAGIC)) {
 453                 ret = 1;
 454                 td->byte_order = (BYTE_ORDER == BIG_ENDIAN) ?
 455                                         LITTLE_ENDIAN : BIG_ENDIAN;
 456                 CTF_TRACE_SET_FIELD(td, byte_order);
 457         }
 458 end:
 459         rewind(fp);
 460         return ret;
 461 }
 462
 463 /*
 464  * Returns 0 on success, -1 on error.
 465  */
 466 static
 467 int check_version(unsigned int major, unsigned int minor)
 468 {
 469         switch (major) {
 470         case 1:
 471                 switch (minor) {
 472                 case 8:
 473                         return 0;
 474                 default:
 475                         goto warning;
 476                 }
 477         default:
 478                 goto warning;
 479
 480         }
 481
 482         /* eventually return an error instead of warning */
 483 warning:
 484         fprintf(stdout, "[warning] Unsupported CTF specification version %u.%u. Trying anyway.\n",
 485                 major, minor);
 486         return 0;
 487 }
 488
 489 static
 490 int ctf_open_trace_metadata_packet_read(struct ctf_trace *td, FILE *in,
 491                                         FILE *out)
 492 {
 493         struct metadata_packet_header header;
 494         size_t readlen, writelen, toread;
 495         char buf[4096 + 1];     /* + 1 for debug-mode \0 */
 496         int ret = 0;
 497
 498         readlen = fread(&header, header_sizeof(header), 1, in);
 499         if (readlen < 1)
 500                 return -EINVAL;
 501
 502         if (td->byte_order != BYTE_ORDER) {
 503                 header.magic = GUINT32_SWAP_LE_BE(header.magic);
 504                 header.checksum = GUINT32_SWAP_LE_BE(header.checksum);
 505                 header.content_size = GUINT32_SWAP_LE_BE(header.content_size);
 506                 header.packet_size = GUINT32_SWAP_LE_BE(header.packet_size);
 507         }
 508         if (header.checksum)
 509                 fprintf(stdout, "[warning] checksum verification not supported yet.\n");
 510         if (header.compression_scheme) {
 511                 fprintf(stdout, "[error] compression (%u) not supported yet.\n",
 512                         header.compression_scheme);
 513                 return -EINVAL;
 514         }
 515         if (header.encryption_scheme) {
 516                 fprintf(stdout, "[error] encryption (%u) not supported yet.\n",
 517                         header.encryption_scheme);
 518                 return -EINVAL;
 519         }
 520         if (header.checksum_scheme) {
 521                 fprintf(stdout, "[error] checksum (%u) not supported yet.\n",
 522                         header.checksum_scheme);
 523                 return -EINVAL;
 524         }
 525         if (check_version(header.major, header.minor) < 0)
 526                 return -EINVAL;
 527         if (!CTF_TRACE_FIELD_IS_SET(td, uuid)) {
 528                 memcpy(td->uuid, header.uuid, sizeof(header.uuid));
 529                 CTF_TRACE_SET_FIELD(td, uuid);
 530         } else {
 531                 if (uuid_compare(header.uuid, td->uuid))
 532                         return -EINVAL;
 533         }
 534
 535         toread = (header.content_size / CHAR_BIT) - header_sizeof(header);
 536
 537         for (;;) {
 538                 readlen = fread(buf, sizeof(char), min(sizeof(buf) - 1, toread), in);
 539                 if (ferror(in)) {
 540                         ret = -EINVAL;
 541                         break;
 542                 }
 543                 if (babeltrace_debug) {
 544                         buf[readlen] = '\0';
 545                         fprintf(stdout, "[debug] metadata packet read: %s\n",
 546                                 buf);
 547                 }
 548
 549                 writelen = fwrite(buf, sizeof(char), readlen, out);
 550                 if (writelen < readlen) {
 551                         ret = -EIO;
 552                         break;
 553                 }
 554                 if (ferror(out)) {
 555                         ret = -EINVAL;
 556                         break;
 557                 }
 558                 toread -= readlen;
 559                 if (!toread) {
 560                         ret = 0;        /* continue reading next packet */
 561                         goto read_padding;
 562                 }
 563         }
 564         return ret;
 565
 566 read_padding:
 567         toread = (header.packet_size - header.content_size) / CHAR_BIT;
 568         ret = fseek(in, toread, SEEK_CUR);
 569         if (ret < 0) {
 570                 fprintf(stdout, "[warning] Missing padding at end of file\n");
 571                 ret = 0;
 572         }
 573         return ret;
 574 }
 575
 576 static
 577 int ctf_open_trace_metadata_stream_read(struct ctf_trace *td, FILE **fp,
 578                                         char **buf)
 579 {
 580         FILE *in, *out;
 581         size_t size;
 582         int ret;
 583
 584         in = *fp;
 585         /*
 586          * Using strlen on *buf instead of size of open_memstream
 587          * because its size includes garbage at the end (after final
 588          * \0). This is the allocated size, not the actual string size.
 589          */
 590         out = open_memstream(buf, &size);
 591         if (out == NULL)
 592                 return -errno;
 593
 594         for (;;) {
 595                 ret = ctf_open_trace_metadata_packet_read(td, in, out);
 596                 if (ret) {
 597                         break;
 598                 }
 599                 if (feof(in)) {
 600                         ret = 0;
 601                         break;
 602                 }
 603         }
 604         fclose(out);    /* flush the buffer */
 605         fclose(in);
 606         /* open for reading */
 607         *fp = fmemopen(*buf, strlen(*buf), "rb");
 608         return 0;
 609 }
 610
 611 static
 612 int ctf_open_trace_metadata_read(struct ctf_trace *td)
 613 {
 614         struct ctf_scanner *scanner;
 615         struct ctf_file_stream *metadata_stream;
 616         FILE *fp;
 617         char *buf = NULL;
 618         int ret = 0;
 619
 620         metadata_stream = g_new0(struct ctf_file_stream, 1);
 621         td->metadata = &metadata_stream->parent;
 622         metadata_stream->pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
 623         if (metadata_stream->pos.fd < 0) {
 624                 fprintf(stdout, "Unable to open metadata.\n");
 625                 return metadata_stream->pos.fd;
 626         }
 627
 628         if (babeltrace_debug)
 629                 yydebug = 1;
 630
 631         fp = fdopen(metadata_stream->pos.fd, "r");
 632         if (!fp) {
 633                 fprintf(stdout, "[error] Unable to open metadata stream.\n");
 634                 ret = -errno;
 635                 goto end_stream;
 636         }
 637
 638         if (packet_metadata(td, fp)) {
 639                 ret = ctf_open_trace_metadata_stream_read(td, &fp, &buf);
 640                 if (ret)
 641                         goto end_packet_read;
 642         } else {
 643                 unsigned int major, minor;
 644                 ssize_t nr_items;
 645
 646                 td->byte_order = BYTE_ORDER;
 647
 648                 /* Check text-only metadata header and version */
 649                 nr_items = fscanf(fp, "/* CTF %u.%u", &major, &minor);
 650                 if (nr_items < 2)
 651                         fprintf(stdout, "[warning] Ill-shapen or missing \"/* CTF x.y\" header for text-only metadata.\n");
 652                 if (check_version(major, minor) < 0) {
 653                         ret = -EINVAL;
 654                         goto end_packet_read;
 655                 }
 656                 rewind(fp);
 657         }
 658
 659         scanner = ctf_scanner_alloc(fp);
 660         if (!scanner) {
 661                 fprintf(stdout, "[error] Error allocating scanner\n");
 662                 ret = -ENOMEM;
 663                 goto end_scanner_alloc;
 664         }
 665         ret = ctf_scanner_append_ast(scanner);
 666         if (ret) {
 667                 fprintf(stdout, "[error] Error creating AST\n");
 668                 goto end;
 669         }
 670
 671         if (babeltrace_debug) {
 672                 ret = ctf_visitor_print_xml(stdout, 0, &scanner->ast->root);
 673                 if (ret) {
 674                         fprintf(stdout, "[error] Error visiting AST for XML output\n");
 675                         goto end;
 676                 }
 677         }
 678
 679         ret = ctf_visitor_semantic_check(stdout, 0, &scanner->ast->root);
 680         if (ret) {
 681                 fprintf(stdout, "[error] Error in CTF semantic validation %d\n", ret);
 682                 goto end;
 683         }
 684         ret = ctf_visitor_construct_metadata(stdout, 0, &scanner->ast->root,
 685                         td, td->byte_order);
 686         if (ret) {
 687                 fprintf(stdout, "[error] Error in CTF metadata constructor %d\n", ret);
 688                 goto end;
 689         }
 690 end:
 691         ctf_scanner_free(scanner);
 692 end_scanner_alloc:
 693 end_packet_read:
 694         fclose(fp);
 695         free(buf);
 696 end_stream:
 697         close(metadata_stream->pos.fd);
 698         if (ret)
 699                 g_free(metadata_stream);
 700         return ret;
 701 }
 702
 703 static
 704 struct ctf_stream_event *create_event_definitions(struct ctf_trace *td,
 705                                                   struct ctf_stream *stream,
 706                                                   struct ctf_event *event)
 707 {
 708         struct ctf_stream_event *stream_event = g_new0(struct ctf_stream_event, 1);
 709
 710         if (event->context_decl) {
 711                 struct definition *definition =
 712                         event->context_decl->p.definition_new(&event->context_decl->p,
 713                                 stream->parent_def_scope, 0, 0, "event.context");
 714                 if (!definition) {
 715                         goto error;
 716                 }
 717                 stream_event->event_context = container_of(definition,
 718                                         struct definition_struct, p);
 719                 stream->parent_def_scope = stream_event->event_context->p.scope;
 720         }
 721         if (event->fields_decl) {
 722                 struct definition *definition =
 723                         event->fields_decl->p.definition_new(&event->fields_decl->p,
 724                                 stream->parent_def_scope, 0, 0, "event.fields");
 725                 if (!definition) {
 726                         goto error;
 727                 }
 728                 stream_event->event_fields = container_of(definition,
 729                                         struct definition_struct, p);
 730                 stream->parent_def_scope = stream_event->event_fields->p.scope;
 731         }
 732         return stream_event;
 733
 734 error:
 735         if (stream_event->event_fields)
 736                 definition_unref(&stream_event->event_fields->p);
 737         if (stream_event->event_context)
 738                 definition_unref(&stream_event->event_context->p);
 739         return NULL;
 740 }
 741
 742 static
 743 int create_stream_definitions(struct ctf_trace *td, struct ctf_stream *stream)
 744 {
 745         struct ctf_stream_class *stream_class;
 746         int ret;
 747         int i;
 748
 749         if (stream->stream_definitions_created)
 750                 return 0;
 751
 752         stream_class = stream->stream_class;
 753
 754         if (stream_class->packet_context_decl) {
 755                 struct definition *definition =
 756                         stream_class->packet_context_decl->p.definition_new(&stream_class->packet_context_decl->p,
 757                                 stream->parent_def_scope, 0, 0, "stream.packet.context");
 758                 if (!definition) {
 759                         ret = -EINVAL;
 760                         goto error;
 761                 }
 762                 stream->stream_packet_context = container_of(definition,
 763                                                 struct definition_struct, p);
 764                 stream->parent_def_scope = stream->stream_packet_context->p.scope;
 765         }
 766         if (stream_class->event_header_decl) {
 767                 struct definition *definition =
 768                         stream_class->event_header_decl->p.definition_new(&stream_class->event_header_decl->p,
 769                                 stream->parent_def_scope, 0, 0, "stream.event.header");
 770                 if (!definition) {
 771                         ret = -EINVAL;
 772                         goto error;
 773                 }
 774                 stream->stream_event_header =
 775                         container_of(definition, struct definition_struct, p);
 776                 stream->parent_def_scope = stream->stream_event_header->p.scope;
 777         }
 778         if (stream_class->event_context_decl) {
 779                 struct definition *definition =
 780                         stream_class->event_context_decl->p.definition_new(&stream_class->event_context_decl->p,
 781                                 stream->parent_def_scope, 0, 0, "stream.event.context");
 782                 if (!definition) {
 783                         ret = -EINVAL;
 784                         goto error;
 785                 }
 786                 stream->stream_event_context =
 787                         container_of(definition, struct definition_struct, p);
 788                 stream->parent_def_scope = stream->stream_event_context->p.scope;
 789         }
 790         stream->events_by_id = g_ptr_array_new();
 791         g_ptr_array_set_size(stream->events_by_id, stream_class->events_by_id->len);
 792         for (i = 0; i < stream->events_by_id->len; i++) {
 793                 struct ctf_event *event = g_ptr_array_index(stream_class->events_by_id, i);
 794                 struct ctf_stream_event *stream_event;
 795
 796                 if (!event)
 797                         continue;
 798                 stream_event = create_event_definitions(td, stream, event);
 799                 if (!stream_event)
 800                         goto error_event;
 801                 g_ptr_array_index(stream->events_by_id, i) = stream_event;
 802         }
 803         return 0;
 804
 805 error_event:
 806         for (i = 0; i < stream->events_by_id->len; i++) {
 807                 struct ctf_stream_event *stream_event = g_ptr_array_index(stream->events_by_id, i);
 808                 if (stream_event)
 809                         g_free(stream_event);
 810         }
 811         g_ptr_array_free(stream->events_by_id, TRUE);
 812 error:
 813         if (stream->stream_event_context)
 814                 definition_unref(&stream->stream_event_context->p);
 815         if (stream->stream_event_header)
 816                 definition_unref(&stream->stream_event_header->p);
 817         if (stream->stream_packet_context)
 818                 definition_unref(&stream->stream_packet_context->p);
 819         return ret;
 820 }
 821
 822
 823 static
 824 int create_stream_packet_index(struct ctf_trace *td,
 825                                struct ctf_file_stream *file_stream)
 826 {
 827         struct ctf_stream_class *stream;
 828         int len_index;
 829         struct ctf_stream_pos *pos;
 830         struct stat filestats;
 831         struct packet_index packet_index;
 832         int first_packet = 1;
 833         int ret;
 834
 835         pos = &file_stream->pos;
 836
 837         ret = fstat(pos->fd, &filestats);
 838         if (ret < 0)
 839                 return ret;
 840
 841         if (filestats.st_size < MAX_PACKET_HEADER_LEN / CHAR_BIT)
 842                 return -EINVAL;
 843
 844         for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
 845                 uint64_t stream_id = 0;
 846
 847                 if (pos->base) {
 848                         /* unmap old base */
 849                         ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 850                         if (ret) {
 851                                 fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 852                                         strerror(errno));
 853                                 return ret;
 854                         }
 855                         pos->base = NULL;
 856                 }
 857                 /* map new base. Need mapping length from header. */
 858                 pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
 859                                  MAP_PRIVATE, pos->fd, pos->mmap_offset);
 860                 pos->content_size = MAX_PACKET_HEADER_LEN;      /* Unknown at this point */
 861                 pos->packet_size = MAX_PACKET_HEADER_LEN;       /* Unknown at this point */
 862                 pos->offset = 0;        /* Position of the packet header */
 863
 864                 packet_index.offset = pos->mmap_offset;
 865                 packet_index.content_size = 0;
 866                 packet_index.packet_size = 0;
 867                 packet_index.timestamp_begin = 0;
 868                 packet_index.timestamp_end = 0;
 869
 870                 /* read and check header, set stream id (and check) */
 871                 if (file_stream->parent.trace_packet_header) {
 872                         /* Read packet header */
 873                         ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
 874                         if (ret)
 875                                 return ret;
 876                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("magic"));
 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                                 if (defint->value._unsigned != CTF_MAGIC) {
 886                                         fprintf(stdout, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
 887                                                         defint->value._unsigned,
 888                                                         file_stream->pos.packet_index->len,
 889                                                         (ssize_t) pos->mmap_offset);
 890                                         return -EINVAL;
 891                                 }
 892                         }
 893
 894                         /* check uuid */
 895                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("uuid"));
 896                         if (len_index >= 0) {
 897                                 struct definition_array *defarray;
 898                                 struct definition *field;
 899                                 uint64_t i;
 900                                 uint8_t uuidval[UUID_LEN];
 901
 902                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
 903                                 assert(field->declaration->id == CTF_TYPE_ARRAY);
 904                                 defarray = container_of(field, struct definition_array, p);
 905                                 assert(array_len(defarray) == UUID_LEN);
 906                                 assert(defarray->declaration->elem->id == CTF_TYPE_INTEGER);
 907
 908                                 for (i = 0; i < UUID_LEN; i++) {
 909                                         struct definition *elem;
 910                                         struct definition_integer *defint;
 911
 912                                         elem = array_index(defarray, i);
 913                                         assert(elem);
 914                                         defint = container_of(elem, struct definition_integer, p);
 915                                         uuidval[i] = defint->value._unsigned;
 916                                 }
 917                                 ret = uuid_compare(td->uuid, uuidval);
 918                                 if (ret) {
 919                                         fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
 920                                         return -EINVAL;
 921                                 }
 922                         }
 923
 924
 925                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("stream_id"));
 926                         if (len_index >= 0) {
 927                                 struct definition_integer *defint;
 928                                 struct definition *field;
 929
 930                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
 931                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 932                                 defint = container_of(field, struct definition_integer, p);
 933                                 assert(defint->declaration->signedness == FALSE);
 934                                 stream_id = defint->value._unsigned;
 935                         }
 936                 }
 937
 938                 if (!first_packet && file_stream->parent.stream_id != stream_id) {
 939                         fprintf(stdout, "[error] Stream ID is changing within a stream.\n");
 940                         return -EINVAL;
 941                 }
 942                 if (first_packet) {
 943                         file_stream->parent.stream_id = stream_id;
 944                         if (stream_id >= td->streams->len) {
 945                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 946                                 return -EINVAL;
 947                         }
 948                         stream = g_ptr_array_index(td->streams, stream_id);
 949                         if (!stream) {
 950                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 951                                 return -EINVAL;
 952                         }
 953                         file_stream->parent.stream_class = stream;
 954                         ret = create_stream_definitions(td, &file_stream->parent);
 955                         if (ret)
 956                                 return ret;
 957                 }
 958                 first_packet = 0;
 959
 960                 if (file_stream->parent.stream_packet_context) {
 961                         /* Read packet context */
 962                         ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
 963                         if (ret)
 964                                 return ret;
 965                         /* read content size from header */
 966                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("content_size"));
 967                         if (len_index >= 0) {
 968                                 struct definition_integer *defint;
 969                                 struct definition *field;
 970
 971                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 972                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 973                                 defint = container_of(field, struct definition_integer, p);
 974                                 assert(defint->declaration->signedness == FALSE);
 975                                 packet_index.content_size = defint->value._unsigned;
 976                         } else {
 977                                 /* Use file size for packet size */
 978                                 packet_index.content_size = filestats.st_size * CHAR_BIT;
 979                         }
 980
 981                         /* read packet size from header */
 982                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("packet_size"));
 983                         if (len_index >= 0) {
 984                                 struct definition_integer *defint;
 985                                 struct definition *field;
 986
 987                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 988                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 989                                 defint = container_of(field, struct definition_integer, p);
 990                                 assert(defint->declaration->signedness == FALSE);
 991                                 packet_index.packet_size = defint->value._unsigned;
 992                         } else {
 993                                 /* Use content size if non-zero, else file size */
 994                                 packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 995                         }
 996
 997                         /* read timestamp begin from header */
 998                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("timestamp_begin"));
 999                         if (len_index >= 0) {
1000                                 struct definition_integer *defint;
1001                                 struct definition *field;
1002
1003                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
1004                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
1005                                 defint = container_of(field, struct definition_integer, p);
1006                                 assert(defint->declaration->signedness == FALSE);
1007                                 packet_index.timestamp_begin = defint->value._unsigned;
1008                         }
1009
1010                         /* read timestamp end from header */
1011                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("timestamp_end"));
1012                         if (len_index >= 0) {
1013                                 struct definition_integer *defint;
1014                                 struct definition *field;
1015
1016                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
1017                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
1018                                 defint = container_of(field, struct definition_integer, p);
1019                                 assert(defint->declaration->signedness == FALSE);
1020                                 packet_index.timestamp_end = defint->value._unsigned;
1021                         }
1022                 } else {
1023                         /* Use file size for packet size */
1024                         packet_index.content_size = filestats.st_size * CHAR_BIT;
1025                         /* Use content size if non-zero, else file size */
1026                         packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
1027                 }
1028
1029                 /* Validate content size and packet size values */
1030                 if (packet_index.content_size > packet_index.packet_size) {
1031                         fprintf(stdout, "[error] Content size (%zu bits) is larger than packet size (%zu bits).\n",
1032                                 packet_index.content_size, packet_index.packet_size);
1033                         return -EINVAL;
1034                 }
1035
1036                 if (packet_index.packet_size > (filestats.st_size - packet_index.offset) * CHAR_BIT) {
1037                         fprintf(stdout, "[error] Packet size (%zu bits) is larger than remaining file size (%zu bits).\n",
1038                                 packet_index.content_size, (size_t) (filestats.st_size - packet_index.offset) * CHAR_BIT);
1039                         return -EINVAL;
1040                 }
1041
1042                 /* Save position after header and context */
1043                 packet_index.data_offset = pos->offset;
1044
1045                 /* add index to packet array */
1046                 g_array_append_val(file_stream->pos.packet_index, packet_index);
1047
1048                 pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
1049         }
1050
1051         /* Move pos back to beginning of file */
1052         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
1053
1054         return 0;
1055 }
1056
1057 static
1058 int create_trace_definitions(struct ctf_trace *td, struct ctf_stream *stream)
1059 {
1060         int ret;
1061
1062         if (td->packet_header_decl) {
1063                 struct definition *definition =
1064                         td->packet_header_decl->p.definition_new(&td->packet_header_decl->p,
1065                                 stream->parent_def_scope, 0, 0, "trace.packet.header");
1066                 if (!definition) {
1067                         ret = -EINVAL;
1068                         goto error;
1069                 }
1070                 stream->trace_packet_header =
1071                         container_of(definition, struct definition_struct, p);
1072                 stream->parent_def_scope = stream->trace_packet_header->p.scope;
1073         }
1074
1075         return 0;
1076
1077 error:
1078         return ret;
1079 }
1080
1081 /*
1082  * Note: many file streams can inherit from the same stream class
1083  * description (metadata).
1084  */
1085 static
1086 int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags)
1087 {
1088         int ret;
1089         struct ctf_file_stream *file_stream;
1090
1091         ret = openat(td->dirfd, path, flags);
1092         if (ret < 0)
1093                 goto error;
1094         file_stream = g_new0(struct ctf_file_stream, 1);
1095         ctf_init_pos(&file_stream->pos, ret, flags);
1096         ret = create_trace_definitions(td, &file_stream->parent);
1097         if (ret)
1098                 goto error_def;
1099         ret = create_stream_packet_index(td, file_stream);
1100         if (ret)
1101                 goto error_index;
1102         /* Add stream file to stream class */
1103         g_ptr_array_add(file_stream->parent.stream_class->streams,
1104                         &file_stream->parent);
1105         return 0;
1106
1107 error_index:
1108         if (file_stream->parent.trace_packet_header)
1109                 definition_unref(&file_stream->parent.trace_packet_header->p);
1110 error_def:
1111         ctf_fini_pos(&file_stream->pos);
1112         close(file_stream->pos.fd);
1113         g_free(file_stream);
1114 error:
1115         return ret;
1116 }
1117
1118 static
1119 int ctf_open_trace_read(struct ctf_trace *td, const char *path, int flags)
1120 {
1121         int ret;
1122         struct dirent *dirent;
1123         struct dirent *diriter;
1124         size_t dirent_len;
1125
1126         td->flags = flags;
1127
1128         /* Open trace directory */
1129         td->dir = opendir(path);
1130         if (!td->dir) {
1131                 fprintf(stdout, "[error] Unable to open trace directory.\n");
1132                 ret = -ENOENT;
1133                 goto error;
1134         }
1135
1136         td->dirfd = open(path, 0);
1137         if (td->dirfd < 0) {
1138                 fprintf(stdout, "[error] Unable to open trace directory file descriptor.\n");
1139                 ret = -ENOENT;
1140                 goto error_dirfd;
1141         }
1142
1143         /*
1144          * Keep the metadata file separate.
1145          */
1146
1147         ret = ctf_open_trace_metadata_read(td);
1148         if (ret) {
1149                 goto error_metadata;
1150         }
1151
1152         /*
1153          * Open each stream: for each file, try to open, check magic
1154          * number, and get the stream ID to add to the right location in
1155          * the stream array.
1156          */
1157
1158         dirent_len = offsetof(struct dirent, d_name) +
1159                         fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
1160
1161         dirent = malloc(dirent_len);
1162
1163         for (;;) {
1164                 ret = readdir_r(td->dir, dirent, &diriter);
1165                 if (ret) {
1166                         fprintf(stdout, "[error] Readdir error.\n");
1167                         goto readdir_error;
1168                 }
1169                 if (!diriter)
1170                         break;
1171                 /* Ignore hidden files, ., .. and metadata. */
1172                 if (!strncmp(diriter->d_name, ".", 1)
1173                                 || !strcmp(diriter->d_name, "..")
1174                                 || !strcmp(diriter->d_name, "metadata"))
1175                         continue;
1176                 ret = ctf_open_file_stream_read(td, diriter->d_name, flags);
1177                 if (ret) {
1178                         fprintf(stdout, "[error] Open file stream error.\n");
1179                         goto readdir_error;
1180                 }
1181         }
1182
1183         free(dirent);
1184         return 0;
1185
1186 readdir_error:
1187         free(dirent);
1188 error_metadata:
1189         close(td->dirfd);
1190 error_dirfd:
1191         closedir(td->dir);
1192 error:
1193         return ret;
1194 }
1195
1196 static
1197 struct trace_descriptor *ctf_open_trace(const char *path, int flags)
1198 {
1199         struct ctf_trace *td;
1200         int ret;
1201
1202         td = g_new0(struct ctf_trace, 1);
1203
1204         switch (flags & O_ACCMODE) {
1205         case O_RDONLY:
1206                 if (!path) {
1207                         fprintf(stdout, "[error] Path missing for input CTF trace.\n");
1208                         goto error;
1209                 }
1210                 ret = ctf_open_trace_read(td, path, flags);
1211                 if (ret)
1212                         goto error;
1213                 break;
1214         case O_RDWR:
1215                 fprintf(stdout, "[error] Opening CTF traces for output is not supported yet.\n");
1216                 goto error;
1217         default:
1218                 fprintf(stdout, "[error] Incorrect open flags.\n");
1219                 goto error;
1220         }
1221
1222         return &td->parent;
1223 error:
1224         g_free(td);
1225         return NULL;
1226 }
1227
1228 static
1229 void ctf_close_file_stream(struct ctf_file_stream *file_stream)
1230 {
1231         ctf_fini_pos(&file_stream->pos);
1232         close(file_stream->pos.fd);
1233 }
1234
1235 static
1236 void ctf_close_trace(struct trace_descriptor *tdp)
1237 {
1238         struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
1239         int i;
1240
1241         if (td->streams) {
1242                 for (i = 0; i < td->streams->len; i++) {
1243                         struct ctf_stream_class *stream;
1244                         int j;
1245
1246                         stream = g_ptr_array_index(td->streams, i);
1247                         if (!stream)
1248                                 continue;
1249                         for (j = 0; j < stream->streams->len; j++) {
1250                                 struct ctf_file_stream *file_stream;
1251                                 file_stream = container_of(g_ptr_array_index(stream->streams, j), struct ctf_file_stream, parent);
1252                                 ctf_close_file_stream(file_stream);
1253                         }
1254
1255                 }
1256                 g_ptr_array_free(td->streams, TRUE);
1257         }
1258         closedir(td->dir);
1259         g_free(td);
1260 }
1261
1262 void __attribute__((constructor)) ctf_init(void)
1263 {
1264         int ret;
1265
1266         ctf_format.name = g_quark_from_static_string("ctf");
1267         ret = bt_register_format(&ctf_format);
1268         assert(!ret);
1269 }
1270
1271 /* TODO: finalize */