plugins/lttng-utils/debug-info.c

   1 /*
   2  * Babeltrace - Debug Information State Tracker
   3  *
   4  * Copyright (c) 2015 EfficiOS Inc. and Linux Foundation
   5  * Copyright (c) 2015 Philippe Proulx <pproulx@efficios.com>
   6  * Copyright (c) 2015 Antoine Busque <abusque@efficios.com>
   7  * Copyright (c) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  25  * SOFTWARE.
  26  */
  27
  28 #define BT_LOG_TAG "PLUGIN-CTF-LTTNG-UTILS-DEBUG-INFO-FLT"
  29 #include "logging.h"
  30
  31 #include <assert.h>
  32 #include <glib.h>
  33 #include "debug-info.h"
  34 #include "bin-info.h"
  35 #include "utils.h"
  36 #include "copy.h"
  37
  38 struct proc_debug_info_sources {
  39         /*
  40          * Hash table: base address (pointer to uint64_t) to bin info; owned by
  41          * proc_debug_info_sources.
  42          */
  43         GHashTable *baddr_to_bin_info;
  44
  45         /*
  46          * Hash table: IP (pointer to uint64_t) to (struct debug_info_source *);
  47          * owned by proc_debug_info_sources.
  48          */
  49         GHashTable *ip_to_debug_info_src;
  50 };
  51
  52 struct debug_info {
  53         struct debug_info_component *comp;
  54
  55         /*
  56          * Hash table of VPIDs (pointer to int64_t) to
  57          * (struct ctf_proc_debug_infos*); owned by debug_info.
  58          */
  59         GHashTable *vpid_to_proc_dbg_info_src;
  60         GQuark q_statedump_bin_info;
  61         GQuark q_statedump_debug_link;
  62         GQuark q_statedump_build_id;
  63         GQuark q_statedump_start;
  64         GQuark q_dl_open;
  65         GQuark q_lib_load;
  66         GQuark q_lib_unload;
  67 };
  68
  69 static
  70 int debug_info_init(struct debug_info *info)
  71 {
  72         info->q_statedump_bin_info = g_quark_from_string(
  73                         "lttng_ust_statedump:bin_info");
  74         info->q_statedump_debug_link = g_quark_from_string(
  75                         "lttng_ust_statedump:debug_link)");
  76         info->q_statedump_build_id = g_quark_from_string(
  77                         "lttng_ust_statedump:build_id");
  78         info->q_statedump_start = g_quark_from_string(
  79                         "lttng_ust_statedump:start");
  80         info->q_dl_open = g_quark_from_string("lttng_ust_dl:dlopen");
  81         info->q_lib_load = g_quark_from_string("lttng_ust_lib:load");
  82         info->q_lib_unload = g_quark_from_string("lttng_ust_lib:unload");
  83
  84         return bin_info_init();
  85 }
  86
  87 static
  88 void debug_info_source_destroy(struct debug_info_source *debug_info_src)
  89 {
  90         if (!debug_info_src) {
  91                 return;
  92         }
  93
  94         free(debug_info_src->func);
  95         free(debug_info_src->src_path);
  96         free(debug_info_src->bin_path);
  97         free(debug_info_src->bin_loc);
  98         g_free(debug_info_src);
  99 }
 100
 101 static
 102 struct debug_info_source *debug_info_source_create_from_bin(struct bin_info *bin,
 103                 uint64_t ip)
 104 {
 105         int ret;
 106         struct debug_info_source *debug_info_src = NULL;
 107         struct source_location *src_loc = NULL;
 108
 109         debug_info_src = g_new0(struct debug_info_source, 1);
 110
 111         if (!debug_info_src) {
 112                 goto end;
 113         }
 114
 115         /* Lookup function name */
 116         ret = bin_info_lookup_function_name(bin, ip, &debug_info_src->func);
 117         if (ret) {
 118                 goto error;
 119         }
 120
 121         /* Can't retrieve src_loc from ELF, or could not find binary, skip. */
 122         if (!bin->is_elf_only || !debug_info_src->func) {
 123                 /* Lookup source location */
 124                 ret = bin_info_lookup_source_location(bin, ip, &src_loc);
 125                 BT_LOGD("Failed to lookup source location: ret=%d", ret);
 126         }
 127
 128         if (src_loc) {
 129                 debug_info_src->line_no = src_loc->line_no;
 130
 131                 if (src_loc->filename) {
 132                         debug_info_src->src_path = strdup(src_loc->filename);
 133                         if (!debug_info_src->src_path) {
 134                                 goto error;
 135                         }
 136
 137                         debug_info_src->short_src_path = get_filename_from_path(
 138                                         debug_info_src->src_path);
 139                 }
 140
 141                 source_location_destroy(src_loc);
 142         }
 143
 144         if (bin->elf_path) {
 145                 debug_info_src->bin_path = strdup(bin->elf_path);
 146                 if (!debug_info_src->bin_path) {
 147                         goto error;
 148                 }
 149
 150                 debug_info_src->short_bin_path = get_filename_from_path(
 151                                 debug_info_src->bin_path);
 152
 153                 ret = bin_info_get_bin_loc(bin, ip, &(debug_info_src->bin_loc));
 154                 if (ret) {
 155                         goto error;
 156                 }
 157         }
 158
 159 end:
 160         return debug_info_src;
 161
 162 error:
 163         debug_info_source_destroy(debug_info_src);
 164         return NULL;
 165 }
 166
 167 static
 168 void proc_debug_info_sources_destroy(
 169                 struct proc_debug_info_sources *proc_dbg_info_src)
 170 {
 171         if (!proc_dbg_info_src) {
 172                 return;
 173         }
 174
 175         if (proc_dbg_info_src->baddr_to_bin_info) {
 176                 g_hash_table_destroy(proc_dbg_info_src->baddr_to_bin_info);
 177         }
 178
 179         if (proc_dbg_info_src->ip_to_debug_info_src) {
 180                 g_hash_table_destroy(proc_dbg_info_src->ip_to_debug_info_src);
 181         }
 182
 183         g_free(proc_dbg_info_src);
 184 }
 185
 186 static
 187 struct proc_debug_info_sources *proc_debug_info_sources_create(void)
 188 {
 189         struct proc_debug_info_sources *proc_dbg_info_src = NULL;
 190
 191         proc_dbg_info_src = g_new0(struct proc_debug_info_sources, 1);
 192         if (!proc_dbg_info_src) {
 193                 goto end;
 194         }
 195
 196         proc_dbg_info_src->baddr_to_bin_info = g_hash_table_new_full(
 197                         g_int64_hash, g_int64_equal, (GDestroyNotify) g_free,
 198                         (GDestroyNotify) bin_info_destroy);
 199         if (!proc_dbg_info_src->baddr_to_bin_info) {
 200                 goto error;
 201         }
 202
 203         proc_dbg_info_src->ip_to_debug_info_src = g_hash_table_new_full(
 204                         g_int64_hash, g_int64_equal, (GDestroyNotify) g_free,
 205                         (GDestroyNotify) debug_info_source_destroy);
 206         if (!proc_dbg_info_src->ip_to_debug_info_src) {
 207                 goto error;
 208         }
 209
 210 end:
 211         return proc_dbg_info_src;
 212
 213 error:
 214         proc_debug_info_sources_destroy(proc_dbg_info_src);
 215         return NULL;
 216 }
 217
 218 static
 219 struct proc_debug_info_sources *proc_debug_info_sources_ht_get_entry(
 220                 GHashTable *ht, int64_t vpid)
 221 {
 222         gpointer key = g_new0(int64_t, 1);
 223         struct proc_debug_info_sources *proc_dbg_info_src = NULL;
 224
 225         if (!key) {
 226                 goto end;
 227         }
 228
 229         *((int64_t *) key) = vpid;
 230
 231         /* Exists? Return it */
 232         proc_dbg_info_src = g_hash_table_lookup(ht, key);
 233         if (proc_dbg_info_src) {
 234                 goto end;
 235         }
 236
 237         /* Otherwise, create and return it */
 238         proc_dbg_info_src = proc_debug_info_sources_create();
 239         if (!proc_dbg_info_src) {
 240                 goto end;
 241         }
 242
 243         g_hash_table_insert(ht, key, proc_dbg_info_src);
 244         /* Ownership passed to ht */
 245         key = NULL;
 246 end:
 247         g_free(key);
 248         return proc_dbg_info_src;
 249 }
 250
 251 static
 252 struct debug_info_source *proc_debug_info_sources_get_entry(
 253                 struct proc_debug_info_sources *proc_dbg_info_src, uint64_t ip)
 254 {
 255         struct debug_info_source *debug_info_src = NULL;
 256         gpointer key = g_new0(uint64_t, 1);
 257         GHashTableIter iter;
 258         gpointer baddr, value;
 259
 260         if (!key) {
 261                 goto end;
 262         }
 263
 264         *((uint64_t *) key) = ip;
 265
 266         /* Look in IP to debug infos hash table first. */
 267         debug_info_src = g_hash_table_lookup(
 268                         proc_dbg_info_src->ip_to_debug_info_src,
 269                         key);
 270         if (debug_info_src) {
 271                 goto end;
 272         }
 273
 274         /* Check in all bin_infos. */
 275         g_hash_table_iter_init(&iter, proc_dbg_info_src->baddr_to_bin_info);
 276
 277         while (g_hash_table_iter_next(&iter, &baddr, &value))
 278         {
 279                 struct bin_info *bin = value;
 280
 281                 if (!bin_info_has_address(value, ip)) {
 282                         continue;
 283                 }
 284
 285                 /*
 286                  * Found; add it to cache.
 287                  *
 288                  * FIXME: this should be bounded in size (and implement
 289                  * a caching policy), and entries should be prunned when
 290                  * libraries are unmapped.
 291                  */
 292                 debug_info_src = debug_info_source_create_from_bin(bin, ip);
 293                 if (debug_info_src) {
 294                         g_hash_table_insert(
 295                                         proc_dbg_info_src->ip_to_debug_info_src,
 296                                         key, debug_info_src);
 297                         /* Ownership passed to ht. */
 298                         key = NULL;
 299                 }
 300                 break;
 301         }
 302
 303 end:
 304         free(key);
 305         return debug_info_src;
 306 }
 307
 308 BT_HIDDEN
 309 struct debug_info_source *debug_info_query(struct debug_info *debug_info,
 310                 int64_t vpid, uint64_t ip)
 311 {
 312         struct debug_info_source *dbg_info_src = NULL;
 313         struct proc_debug_info_sources *proc_dbg_info_src;
 314
 315         proc_dbg_info_src = proc_debug_info_sources_ht_get_entry(
 316                         debug_info->vpid_to_proc_dbg_info_src, vpid);
 317         if (!proc_dbg_info_src) {
 318                 goto end;
 319         }
 320
 321         dbg_info_src = proc_debug_info_sources_get_entry(proc_dbg_info_src, ip);
 322
 323 end:
 324         return dbg_info_src;
 325 }
 326
 327 BT_HIDDEN
 328 struct debug_info *debug_info_create(struct debug_info_component *comp)
 329 {
 330         int ret;
 331         struct debug_info *debug_info;
 332
 333         debug_info = g_new0(struct debug_info, 1);
 334         if (!debug_info) {
 335                 goto end;
 336         }
 337
 338         debug_info->vpid_to_proc_dbg_info_src = g_hash_table_new_full(
 339                         g_int64_hash, g_int64_equal, (GDestroyNotify) g_free,
 340                         (GDestroyNotify) proc_debug_info_sources_destroy);
 341         if (!debug_info->vpid_to_proc_dbg_info_src) {
 342                 goto error;
 343         }
 344
 345         debug_info->comp = comp;
 346         ret = debug_info_init(debug_info);
 347         if (ret) {
 348                 goto error;
 349         }
 350
 351 end:
 352         return debug_info;
 353 error:
 354         g_free(debug_info);
 355         return NULL;
 356 }
 357
 358 BT_HIDDEN
 359 void debug_info_destroy(struct debug_info *debug_info)
 360 {
 361         if (!debug_info) {
 362                 goto end;
 363         }
 364
 365         if (debug_info->vpid_to_proc_dbg_info_src) {
 366                 g_hash_table_destroy(debug_info->vpid_to_proc_dbg_info_src);
 367         }
 368
 369         g_free(debug_info);
 370 end:
 371         return;
 372 }
 373
 374 static
 375 void handle_statedump_build_id_event(FILE *err, struct debug_info *debug_info,
 376                 struct bt_ctf_event *event)
 377 {
 378         struct proc_debug_info_sources *proc_dbg_info_src;
 379         struct bin_info *bin = NULL;
 380         int ret;
 381         int64_t vpid;
 382         uint64_t baddr;
 383
 384         ret = get_stream_event_context_int_field_value(err,
 385                         event, "_vpid", &vpid);
 386         if (ret) {
 387                 goto end;
 388         }
 389
 390         ret = get_payload_unsigned_int_field_value(err,
 391                         event, "_baddr", &baddr);
 392         if (ret) {
 393                 fprintf(err, "[error] %s in %s:%d\n", __func__,
 394                                 __FILE__, __LINE__);
 395                 goto end;
 396         }
 397
 398         proc_dbg_info_src = proc_debug_info_sources_ht_get_entry(
 399                         debug_info->vpid_to_proc_dbg_info_src, vpid);
 400         if (!proc_dbg_info_src) {
 401                 goto end;
 402         }
 403
 404         bin = g_hash_table_lookup(proc_dbg_info_src->baddr_to_bin_info,
 405                         (gpointer) &baddr);
 406         if (!bin) {
 407                 /*
 408                  * The build_id event comes after the bin has been
 409                  * created. If it isn't found, just ignore this event.
 410                  */
 411                 goto end;
 412         }
 413
 414         ret = get_payload_build_id_field_value(err, event, "_build_id",
 415                         &bin->build_id, &bin->build_id_len);
 416         if (ret) {
 417                 fprintf(err, "[error] %s in %s:%d\n", __func__,
 418                                 __FILE__, __LINE__);
 419                 goto end;
 420         }
 421
 422         /*
 423          * Reset the is_elf_only flag in case it had been set
 424          * previously, because we might find separate debug info using
 425          * the new build id information.
 426          */
 427         bin->is_elf_only = false;
 428
 429         // TODO
 430         //      bin_info_set_build_id(bin, build_id, build_id_len);
 431
 432 end:
 433         return;
 434 }
 435
 436 static
 437 void handle_statedump_debug_link_event(FILE *err, struct debug_info *debug_info,
 438                 struct bt_ctf_event *event)
 439 {
 440         struct proc_debug_info_sources *proc_dbg_info_src;
 441         struct bin_info *bin = NULL;
 442         int64_t vpid;
 443         uint64_t baddr;
 444         const char *filename = NULL;
 445         uint32_t crc32;
 446         uint64_t tmp;
 447         int ret;
 448
 449         ret = get_stream_event_context_int_field_value(err, event,
 450                         "_vpid", &vpid);
 451         if (ret) {
 452                 goto end;
 453         }
 454
 455         ret = get_payload_unsigned_int_field_value(err,
 456                         event, "_baddr", &baddr);
 457         if (ret) {
 458                 fprintf(err, "[error] %s in %s:%d\n", __func__,
 459                                 __FILE__, __LINE__);
 460                 ret = -1;
 461                 goto end;
 462         }
 463
 464         ret = get_payload_unsigned_int_field_value(err, event, "_crc32", &tmp);
 465         if (ret) {
 466                 fprintf(err, "[error] %s in %s:%d\n", __func__,
 467                                 __FILE__, __LINE__);
 468                 ret = -1;
 469                 goto end;
 470         }
 471         crc32 = (uint32_t) tmp;
 472
 473         ret = get_payload_string_field_value(err,
 474                         event, "_filename", &filename);
 475         if (ret) {
 476                 fprintf(err, "[error] %s in %s:%d\n", __func__,
 477                                 __FILE__, __LINE__);
 478                 ret = -1;
 479                 goto end;
 480         }
 481
 482         proc_dbg_info_src = proc_debug_info_sources_ht_get_entry(
 483                         debug_info->vpid_to_proc_dbg_info_src, vpid);
 484         if (!proc_dbg_info_src) {
 485                 goto end;
 486         }
 487
 488         bin = g_hash_table_lookup(proc_dbg_info_src->baddr_to_bin_info,
 489                         (gpointer) &baddr);
 490         if (!bin) {
 491                 /*
 492                  * The debug_link event comes after the bin has been
 493                  * created. If it isn't found, just ignore this event.
 494                  */
 495                 goto end;
 496         }
 497
 498         bin_info_set_debug_link(bin, filename, crc32);
 499
 500 end:
 501         return;
 502 }
 503
 504 static
 505 void handle_bin_info_event(FILE *err, struct debug_info *debug_info,
 506                 struct bt_ctf_event *event, bool has_pic_field)
 507 {
 508         struct proc_debug_info_sources *proc_dbg_info_src;
 509         struct bin_info *bin;
 510         uint64_t baddr, memsz;
 511         int64_t vpid;
 512         const char *path;
 513         gpointer key = NULL;
 514         bool is_pic;
 515         int ret;
 516
 517         ret = get_payload_unsigned_int_field_value(err,
 518                         event, "_baddr", &baddr);
 519         if (ret) {
 520                 fprintf(err, "[error] %s in %s:%d\n", __func__,
 521                                 __FILE__, __LINE__);
 522                 goto end;
 523         }
 524
 525         ret = get_payload_unsigned_int_field_value(err,
 526                         event, "_memsz", &memsz);
 527         if (ret) {
 528                 fprintf(err, "[error] %s in %s:%d\n", __func__,
 529                                 __FILE__, __LINE__);
 530                 goto end;
 531         }
 532
 533         /*
 534          * This field is not produced by the dlopen event emitted before
 535          * lttng-ust 2.9.
 536          */
 537         ret = get_payload_string_field_value(err,
 538                         event, "_path", &path);
 539         if (ret || !path) {
 540                 goto end;
 541         }
 542
 543         if (has_pic_field) {
 544                 uint64_t tmp;
 545
 546                 ret = get_payload_unsigned_int_field_value(err,
 547                                 event, "_is_pic", &tmp);
 548                 if (ret) {
 549                         fprintf(err, "[error] %s in %s:%d\n", __func__,
 550                                         __FILE__, __LINE__);
 551                         ret = -1;
 552                         goto end;
 553                 }
 554                 is_pic = (tmp == 1);
 555         } else {
 556                 /*
 557                  * dlopen has no is_pic field, because the shared
 558                  * object is always PIC.
 559                  */
 560                 is_pic = true;
 561         }
 562
 563         ret = get_stream_event_context_int_field_value(err, event, "_vpid",
 564                         &vpid);
 565         if (ret) {
 566                 goto end;
 567         }
 568
 569         if (memsz == 0) {
 570                 /* Ignore VDSO. */
 571                 goto end;
 572         }
 573
 574         proc_dbg_info_src = proc_debug_info_sources_ht_get_entry(
 575                         debug_info->vpid_to_proc_dbg_info_src, vpid);
 576         if (!proc_dbg_info_src) {
 577                 goto end;
 578         }
 579
 580         key = g_new0(uint64_t, 1);
 581         if (!key) {
 582                 goto end;
 583         }
 584
 585         *((uint64_t *) key) = baddr;
 586
 587         bin = g_hash_table_lookup(proc_dbg_info_src->baddr_to_bin_info,
 588                         key);
 589         if (bin) {
 590                 goto end;
 591         }
 592
 593         bin = bin_info_create(path, baddr, memsz, is_pic,
 594                 debug_info->comp->arg_debug_dir,
 595                 debug_info->comp->arg_target_prefix);
 596         if (!bin) {
 597                 goto end;
 598         }
 599
 600         g_hash_table_insert(proc_dbg_info_src->baddr_to_bin_info,
 601                         key, bin);
 602         /* Ownership passed to ht. */
 603         key = NULL;
 604
 605 end:
 606         g_free(key);
 607         return;
 608 }
 609
 610 static inline
 611 void handle_statedump_bin_info_event(FILE *err, struct debug_info *debug_info,
 612                 struct bt_ctf_event *event)
 613 {
 614         handle_bin_info_event(err, debug_info, event, true);
 615 }
 616
 617 static inline
 618 void handle_lib_load_event(FILE *err, struct debug_info *debug_info,
 619                 struct bt_ctf_event *event)
 620 {
 621         handle_bin_info_event(err, debug_info, event, false);
 622 }
 623
 624 static inline
 625 void handle_lib_unload_event(FILE *err, struct debug_info *debug_info,
 626                 struct bt_ctf_event *event)
 627 {
 628         struct proc_debug_info_sources *proc_dbg_info_src;
 629         uint64_t baddr;
 630         int64_t vpid;
 631         gpointer key_ptr = NULL;
 632         int ret;
 633
 634         ret = get_payload_unsigned_int_field_value(err,
 635                         event, "_baddr", &baddr);
 636         if (ret) {
 637                 fprintf(err, "[error] %s in %s:%d\n", __func__,
 638                                 __FILE__, __LINE__);
 639                 ret = -1;
 640                 goto end;
 641         }
 642
 643         ret = get_stream_event_context_int_field_value(err, event, "_vpid",
 644                         &vpid);
 645         if (ret) {
 646                 goto end;
 647         }
 648
 649         proc_dbg_info_src = proc_debug_info_sources_ht_get_entry(
 650                         debug_info->vpid_to_proc_dbg_info_src, vpid);
 651         if (!proc_dbg_info_src) {
 652                 goto end;
 653         }
 654
 655         key_ptr = (gpointer) &baddr;
 656         (void) g_hash_table_remove(proc_dbg_info_src->baddr_to_bin_info,
 657                         key_ptr);
 658 end:
 659         return;
 660 }
 661
 662 static
 663 void handle_statedump_start(FILE *err, struct debug_info *debug_info,
 664                 struct bt_ctf_event *event)
 665 {
 666         struct proc_debug_info_sources *proc_dbg_info_src;
 667         int64_t vpid;
 668         int ret;
 669
 670         ret = get_stream_event_context_int_field_value(err, event,
 671                         "_vpid", &vpid);
 672         if (ret) {
 673                 goto end;
 674         }
 675
 676         proc_dbg_info_src = proc_debug_info_sources_ht_get_entry(
 677                         debug_info->vpid_to_proc_dbg_info_src, vpid);
 678         if (!proc_dbg_info_src) {
 679                 goto end;
 680         }
 681
 682         g_hash_table_remove_all(proc_dbg_info_src->baddr_to_bin_info);
 683         g_hash_table_remove_all(proc_dbg_info_src->ip_to_debug_info_src);
 684
 685 end:
 686         return;
 687 }
 688
 689 BT_HIDDEN
 690 void debug_info_handle_event(FILE *err, struct bt_ctf_event *event,
 691                 struct debug_info *debug_info)
 692 {
 693         struct bt_ctf_event_class *event_class;
 694         const char *event_name;
 695         GQuark q_event_name;
 696
 697         if (!debug_info || !event) {
 698                 goto end;
 699         }
 700         event_class = bt_ctf_event_get_class(event);
 701         if (!event_class) {
 702                 goto end;
 703         }
 704         event_name = bt_ctf_event_class_get_name(event_class);
 705         if (!event_name) {
 706                 goto end_put_class;
 707         }
 708         q_event_name = g_quark_try_string(event_name);
 709
 710         if (q_event_name == debug_info->q_statedump_bin_info) {
 711                 /* State dump */
 712                 handle_statedump_bin_info_event(err, debug_info, event);
 713         } else if (q_event_name == debug_info->q_dl_open ||
 714                         q_event_name == debug_info->q_lib_load) {
 715                 /*
 716                  * dl_open and lib_load events are both checked for since
 717                  * only dl_open was produced as of lttng-ust 2.8.
 718                  *
 719                  * lib_load, which is produced from lttng-ust 2.9+, is a lot
 720                  * more reliable since it will be emitted when other functions
 721                  * of the dlopen family are called (e.g. dlmopen) and when
 722                  * library are transitively loaded.
 723                  */
 724                 handle_lib_load_event(err, debug_info, event);
 725         } else if (q_event_name == debug_info->q_statedump_start) {
 726                 /* Start state dump */
 727                 handle_statedump_start(err, debug_info, event);
 728         } else if (q_event_name == debug_info->q_statedump_debug_link) {
 729                 /* Debug link info */
 730                 handle_statedump_debug_link_event(err, debug_info, event);
 731         } else if (q_event_name == debug_info->q_statedump_build_id) {
 732                 /* Build ID info */
 733                 handle_statedump_build_id_event(err, debug_info, event);
 734         } else if (q_event_name == debug_info-> q_lib_unload) {
 735                 handle_lib_unload_event(err, debug_info, event);
 736         }
 737
 738 end_put_class:
 739         bt_put(event_class);
 740 end:
 741         return;
 742 }