trace2.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "json-writer.h"
   4 #include "quote.h"
   5 #include "run-command.h"
   6 #include "sigchain.h"
   7 #include "thread-utils.h"
   8 #include "version.h"
   9 #include "trace2/tr2_cfg.h"
  10 #include "trace2/tr2_cmd_name.h"
  11 #include "trace2/tr2_dst.h"
  12 #include "trace2/tr2_sid.h"
  13 #include "trace2/tr2_sysenv.h"
  14 #include "trace2/tr2_tgt.h"
  15 #include "trace2/tr2_tls.h"
  16
  17 static int trace2_enabled;
  18
  19 static int tr2_next_child_id; /* modify under lock */
  20 static int tr2_next_exec_id; /* modify under lock */
  21 static int tr2_next_repo_id = 1; /* modify under lock. zero is reserved */
  22
  23 /*
  24  * A table of the builtin TRACE2 targets.  Each of these may be independently
  25  * enabled or disabled.  Each TRACE2 API method will try to write an event to
  26  * *each* of the enabled targets.
  27  */
  28 /* clang-format off */
  29 static struct tr2_tgt *tr2_tgt_builtins[] =
  30 {
  31         &tr2_tgt_normal,
  32         &tr2_tgt_perf,
  33         &tr2_tgt_event,
  34         NULL
  35 };
  36 /* clang-format on */
  37
  38 /* clang-format off */
  39 #define for_each_builtin(j, tgt_j)                      \
  40         for (j = 0, tgt_j = tr2_tgt_builtins[j];        \
  41              tgt_j;                                     \
  42              j++, tgt_j = tr2_tgt_builtins[j])
  43 /* clang-format on */
  44
  45 /* clang-format off */
  46 #define for_each_wanted_builtin(j, tgt_j)            \
  47         for_each_builtin(j, tgt_j)                   \
  48                 if (tr2_dst_trace_want(tgt_j->pdst))
  49 /* clang-format on */
  50
  51 /*
  52  * Force (rather than lazily) initialize any of the requested
  53  * builtin TRACE2 targets at startup (and before we've seen an
  54  * actual TRACE2 event call) so we can see if we need to setup
  55  * the TR2 and TLS machinery.
  56  *
  57  * Return the number of builtin targets enabled.
  58  */
  59 static int tr2_tgt_want_builtins(void)
  60 {
  61         struct tr2_tgt *tgt_j;
  62         int j;
  63         int sum = 0;
  64
  65         for_each_builtin (j, tgt_j)
  66                 if (tgt_j->pfn_init())
  67                         sum++;
  68
  69         return sum;
  70 }
  71
  72 /*
  73  * Properly terminate each builtin target.  Give each target
  74  * a chance to write a summary event and/or flush if necessary
  75  * and then close the fd.
  76  */
  77 static void tr2_tgt_disable_builtins(void)
  78 {
  79         struct tr2_tgt *tgt_j;
  80         int j;
  81
  82         for_each_builtin (j, tgt_j)
  83                 tgt_j->pfn_term();
  84 }
  85
  86 static int tr2main_exit_code;
  87
  88 /*
  89  * Our atexit routine should run after everything has finished.
  90  *
  91  * Note that events generated here might not actually appear if
  92  * we are writing to fd 1 or 2 and our atexit routine runs after
  93  * the pager's atexit routine (since it closes them to shutdown
  94  * the pipes).
  95  */
  96 static void tr2main_atexit_handler(void)
  97 {
  98         struct tr2_tgt *tgt_j;
  99         int j;
 100         uint64_t us_now;
 101         uint64_t us_elapsed_absolute;
 102
 103         us_now = getnanotime() / 1000;
 104         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 105
 106         /*
 107          * Clear any unbalanced regions so that our atexit message
 108          * does not appear nested.  This improves the appearance of
 109          * the trace output if someone calls die(), for example.
 110          */
 111         tr2tls_pop_unwind_self();
 112
 113         for_each_wanted_builtin (j, tgt_j)
 114                 if (tgt_j->pfn_atexit)
 115                         tgt_j->pfn_atexit(us_elapsed_absolute,
 116                                           tr2main_exit_code);
 117
 118         tr2_tgt_disable_builtins();
 119
 120         tr2tls_release();
 121         tr2_sid_release();
 122         tr2_cmd_name_release();
 123         tr2_cfg_free_patterns();
 124         tr2_cfg_free_env_vars();
 125         tr2_sysenv_release();
 126
 127         trace2_enabled = 0;
 128 }
 129
 130 static void tr2main_signal_handler(int signo)
 131 {
 132         struct tr2_tgt *tgt_j;
 133         int j;
 134         uint64_t us_now;
 135         uint64_t us_elapsed_absolute;
 136
 137         us_now = getnanotime() / 1000;
 138         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 139
 140         for_each_wanted_builtin (j, tgt_j)
 141                 if (tgt_j->pfn_signal)
 142                         tgt_j->pfn_signal(us_elapsed_absolute, signo);
 143
 144         sigchain_pop(signo);
 145         raise(signo);
 146 }
 147
 148 void trace2_initialize_clock(void)
 149 {
 150         tr2tls_start_process_clock();
 151 }
 152
 153 void trace2_initialize_fl(const char *file, int line)
 154 {
 155         struct tr2_tgt *tgt_j;
 156         int j;
 157
 158         if (trace2_enabled)
 159                 return;
 160
 161         tr2_sysenv_load();
 162
 163         if (!tr2_tgt_want_builtins())
 164                 return;
 165         trace2_enabled = 1;
 166
 167         tr2_sid_get();
 168
 169         atexit(tr2main_atexit_handler);
 170         sigchain_push(SIGPIPE, tr2main_signal_handler);
 171         tr2tls_init();
 172
 173         /*
 174          * Emit 'version' message on each active builtin target.
 175          */
 176         for_each_wanted_builtin (j, tgt_j)
 177                 if (tgt_j->pfn_version_fl)
 178                         tgt_j->pfn_version_fl(file, line);
 179 }
 180
 181 int trace2_is_enabled(void)
 182 {
 183         return trace2_enabled;
 184 }
 185
 186 void trace2_cmd_start_fl(const char *file, int line, const char **argv)
 187 {
 188         struct tr2_tgt *tgt_j;
 189         int j;
 190         uint64_t us_now;
 191         uint64_t us_elapsed_absolute;
 192
 193         if (!trace2_enabled)
 194                 return;
 195
 196         us_now = getnanotime() / 1000;
 197         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 198
 199         for_each_wanted_builtin (j, tgt_j)
 200                 if (tgt_j->pfn_start_fl)
 201                         tgt_j->pfn_start_fl(file, line, us_elapsed_absolute,
 202                                             argv);
 203 }
 204
 205 int trace2_cmd_exit_fl(const char *file, int line, int code)
 206 {
 207         struct tr2_tgt *tgt_j;
 208         int j;
 209         uint64_t us_now;
 210         uint64_t us_elapsed_absolute;
 211
 212         code &= 0xff;
 213
 214         if (!trace2_enabled)
 215                 return code;
 216
 217         trace2_collect_process_info(TRACE2_PROCESS_INFO_EXIT);
 218
 219         tr2main_exit_code = code;
 220
 221         us_now = getnanotime() / 1000;
 222         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 223
 224         for_each_wanted_builtin (j, tgt_j)
 225                 if (tgt_j->pfn_exit_fl)
 226                         tgt_j->pfn_exit_fl(file, line, us_elapsed_absolute,
 227                                            code);
 228
 229         return code;
 230 }
 231
 232 void trace2_cmd_error_va_fl(const char *file, int line, const char *fmt,
 233                             va_list ap)
 234 {
 235         struct tr2_tgt *tgt_j;
 236         int j;
 237
 238         if (!trace2_enabled)
 239                 return;
 240
 241         /*
 242          * We expect each target function to treat 'ap' as constant
 243          * and use va_copy (because an 'ap' can only be walked once).
 244          */
 245         for_each_wanted_builtin (j, tgt_j)
 246                 if (tgt_j->pfn_error_va_fl)
 247                         tgt_j->pfn_error_va_fl(file, line, fmt, ap);
 248 }
 249
 250 void trace2_cmd_path_fl(const char *file, int line, const char *pathname)
 251 {
 252         struct tr2_tgt *tgt_j;
 253         int j;
 254
 255         if (!trace2_enabled)
 256                 return;
 257
 258         for_each_wanted_builtin (j, tgt_j)
 259                 if (tgt_j->pfn_command_path_fl)
 260                         tgt_j->pfn_command_path_fl(file, line, pathname);
 261 }
 262
 263 void trace2_cmd_name_fl(const char *file, int line, const char *name)
 264 {
 265         struct tr2_tgt *tgt_j;
 266         const char *hierarchy;
 267         int j;
 268
 269         if (!trace2_enabled)
 270                 return;
 271
 272         tr2_cmd_name_append_hierarchy(name);
 273         hierarchy = tr2_cmd_name_get_hierarchy();
 274
 275         for_each_wanted_builtin (j, tgt_j)
 276                 if (tgt_j->pfn_command_name_fl)
 277                         tgt_j->pfn_command_name_fl(file, line, name, hierarchy);
 278 }
 279
 280 void trace2_cmd_mode_fl(const char *file, int line, const char *mode)
 281 {
 282         struct tr2_tgt *tgt_j;
 283         int j;
 284
 285         if (!trace2_enabled)
 286                 return;
 287
 288         for_each_wanted_builtin (j, tgt_j)
 289                 if (tgt_j->pfn_command_mode_fl)
 290                         tgt_j->pfn_command_mode_fl(file, line, mode);
 291 }
 292
 293 void trace2_cmd_alias_fl(const char *file, int line, const char *alias,
 294                          const char **argv)
 295 {
 296         struct tr2_tgt *tgt_j;
 297         int j;
 298
 299         if (!trace2_enabled)
 300                 return;
 301
 302         for_each_wanted_builtin (j, tgt_j)
 303                 if (tgt_j->pfn_alias_fl)
 304                         tgt_j->pfn_alias_fl(file, line, alias, argv);
 305 }
 306
 307 void trace2_cmd_list_config_fl(const char *file, int line)
 308 {
 309         if (!trace2_enabled)
 310                 return;
 311
 312         tr2_cfg_list_config_fl(file, line);
 313 }
 314
 315 void trace2_cmd_list_env_vars_fl(const char *file, int line)
 316 {
 317         if (!trace2_enabled)
 318                 return;
 319
 320         tr2_list_env_vars_fl(file, line);
 321 }
 322
 323 void trace2_cmd_set_config_fl(const char *file, int line, const char *key,
 324                               const char *value)
 325 {
 326         if (!trace2_enabled)
 327                 return;
 328
 329         tr2_cfg_set_fl(file, line, key, value);
 330 }
 331
 332 void trace2_child_start_fl(const char *file, int line,
 333                            struct child_process *cmd)
 334 {
 335         struct tr2_tgt *tgt_j;
 336         int j;
 337         uint64_t us_now;
 338         uint64_t us_elapsed_absolute;
 339
 340         if (!trace2_enabled)
 341                 return;
 342
 343         us_now = getnanotime() / 1000;
 344         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 345
 346         cmd->trace2_child_id = tr2tls_locked_increment(&tr2_next_child_id);
 347         cmd->trace2_child_us_start = us_now;
 348
 349         for_each_wanted_builtin (j, tgt_j)
 350                 if (tgt_j->pfn_child_start_fl)
 351                         tgt_j->pfn_child_start_fl(file, line,
 352                                                   us_elapsed_absolute, cmd);
 353 }
 354
 355 void trace2_child_exit_fl(const char *file, int line, struct child_process *cmd,
 356                           int child_exit_code)
 357 {
 358         struct tr2_tgt *tgt_j;
 359         int j;
 360         uint64_t us_now;
 361         uint64_t us_elapsed_absolute;
 362         uint64_t us_elapsed_child;
 363
 364         if (!trace2_enabled)
 365                 return;
 366
 367         us_now = getnanotime() / 1000;
 368         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 369
 370         if (cmd->trace2_child_us_start)
 371                 us_elapsed_child = us_now - cmd->trace2_child_us_start;
 372         else
 373                 us_elapsed_child = 0;
 374
 375         for_each_wanted_builtin (j, tgt_j)
 376                 if (tgt_j->pfn_child_exit_fl)
 377                         tgt_j->pfn_child_exit_fl(file, line,
 378                                                  us_elapsed_absolute,
 379                                                  cmd->trace2_child_id, cmd->pid,
 380                                                  child_exit_code,
 381                                                  us_elapsed_child);
 382 }
 383
 384 int trace2_exec_fl(const char *file, int line, const char *exe,
 385                    const char **argv)
 386 {
 387         struct tr2_tgt *tgt_j;
 388         int j;
 389         int exec_id;
 390         uint64_t us_now;
 391         uint64_t us_elapsed_absolute;
 392
 393         if (!trace2_enabled)
 394                 return -1;
 395
 396         us_now = getnanotime() / 1000;
 397         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 398
 399         exec_id = tr2tls_locked_increment(&tr2_next_exec_id);
 400
 401         for_each_wanted_builtin (j, tgt_j)
 402                 if (tgt_j->pfn_exec_fl)
 403                         tgt_j->pfn_exec_fl(file, line, us_elapsed_absolute,
 404                                            exec_id, exe, argv);
 405
 406         return exec_id;
 407 }
 408
 409 void trace2_exec_result_fl(const char *file, int line, int exec_id, int code)
 410 {
 411         struct tr2_tgt *tgt_j;
 412         int j;
 413         uint64_t us_now;
 414         uint64_t us_elapsed_absolute;
 415
 416         if (!trace2_enabled)
 417                 return;
 418
 419         us_now = getnanotime() / 1000;
 420         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 421
 422         for_each_wanted_builtin (j, tgt_j)
 423                 if (tgt_j->pfn_exec_result_fl)
 424                         tgt_j->pfn_exec_result_fl(
 425                                 file, line, us_elapsed_absolute, exec_id, code);
 426 }
 427
 428 void trace2_thread_start_fl(const char *file, int line, const char *thread_name)
 429 {
 430         struct tr2_tgt *tgt_j;
 431         int j;
 432         uint64_t us_now;
 433         uint64_t us_elapsed_absolute;
 434
 435         if (!trace2_enabled)
 436                 return;
 437
 438         if (tr2tls_is_main_thread()) {
 439                 /*
 440                  * We should only be called from the new thread's thread-proc,
 441                  * so this is technically a bug.  But in those cases where the
 442                  * main thread also runs the thread-proc function (or when we
 443                  * are built with threading disabled), we need to allow it.
 444                  *
 445                  * Convert this call to a region-enter so the nesting looks
 446                  * correct.
 447                  */
 448                 trace2_region_enter_printf_fl(file, line, NULL, NULL, NULL,
 449                                               "thread-proc on main: %s",
 450                                               thread_name);
 451                 return;
 452         }
 453
 454         us_now = getnanotime() / 1000;
 455         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 456
 457         tr2tls_create_self(thread_name, us_now);
 458
 459         for_each_wanted_builtin (j, tgt_j)
 460                 if (tgt_j->pfn_thread_start_fl)
 461                         tgt_j->pfn_thread_start_fl(file, line,
 462                                                    us_elapsed_absolute);
 463 }
 464
 465 void trace2_thread_exit_fl(const char *file, int line)
 466 {
 467         struct tr2_tgt *tgt_j;
 468         int j;
 469         uint64_t us_now;
 470         uint64_t us_elapsed_absolute;
 471         uint64_t us_elapsed_thread;
 472
 473         if (!trace2_enabled)
 474                 return;
 475
 476         if (tr2tls_is_main_thread()) {
 477                 /*
 478                  * We should only be called from the exiting thread's
 479                  * thread-proc, so this is technically a bug.  But in
 480                  * those cases where the main thread also runs the
 481                  * thread-proc function (or when we are built with
 482                  * threading disabled), we need to allow it.
 483                  *
 484                  * Convert this call to a region-leave so the nesting
 485                  * looks correct.
 486                  */
 487                 trace2_region_leave_printf_fl(file, line, NULL, NULL, NULL,
 488                                               "thread-proc on main");
 489                 return;
 490         }
 491
 492         us_now = getnanotime() / 1000;
 493         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 494
 495         /*
 496          * Clear any unbalanced regions and then get the relative time
 497          * for the outer-most region (which we pushed when the thread
 498          * started).  This gives us the run time of the thread.
 499          */
 500         tr2tls_pop_unwind_self();
 501         us_elapsed_thread = tr2tls_region_elasped_self(us_now);
 502
 503         for_each_wanted_builtin (j, tgt_j)
 504                 if (tgt_j->pfn_thread_exit_fl)
 505                         tgt_j->pfn_thread_exit_fl(file, line,
 506                                                   us_elapsed_absolute,
 507                                                   us_elapsed_thread);
 508
 509         tr2tls_unset_self();
 510 }
 511
 512 void trace2_def_param_fl(const char *file, int line, const char *param,
 513                          const char *value)
 514 {
 515         struct tr2_tgt *tgt_j;
 516         int j;
 517
 518         if (!trace2_enabled)
 519                 return;
 520
 521         for_each_wanted_builtin (j, tgt_j)
 522                 if (tgt_j->pfn_param_fl)
 523                         tgt_j->pfn_param_fl(file, line, param, value);
 524 }
 525
 526 void trace2_def_repo_fl(const char *file, int line, struct repository *repo)
 527 {
 528         struct tr2_tgt *tgt_j;
 529         int j;
 530
 531         if (!trace2_enabled)
 532                 return;
 533
 534         if (repo->trace2_repo_id)
 535                 return;
 536
 537         repo->trace2_repo_id = tr2tls_locked_increment(&tr2_next_repo_id);
 538
 539         for_each_wanted_builtin (j, tgt_j)
 540                 if (tgt_j->pfn_repo_fl)
 541                         tgt_j->pfn_repo_fl(file, line, repo);
 542 }
 543
 544 void trace2_region_enter_printf_va_fl(const char *file, int line,
 545                                       const char *category, const char *label,
 546                                       const struct repository *repo,
 547                                       const char *fmt, va_list ap)
 548 {
 549         struct tr2_tgt *tgt_j;
 550         int j;
 551         uint64_t us_now;
 552         uint64_t us_elapsed_absolute;
 553
 554         if (!trace2_enabled)
 555                 return;
 556
 557         us_now = getnanotime() / 1000;
 558         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 559
 560         /*
 561          * Print the region-enter message at the current nesting
 562          * (indentation) level and then push a new level.
 563          *
 564          * We expect each target function to treat 'ap' as constant
 565          * and use va_copy.
 566          */
 567         for_each_wanted_builtin (j, tgt_j)
 568                 if (tgt_j->pfn_region_enter_printf_va_fl)
 569                         tgt_j->pfn_region_enter_printf_va_fl(
 570                                 file, line, us_elapsed_absolute, category,
 571                                 label, repo, fmt, ap);
 572
 573         tr2tls_push_self(us_now);
 574 }
 575
 576 void trace2_region_enter_fl(const char *file, int line, const char *category,
 577                             const char *label, const struct repository *repo, ...)
 578 {
 579         va_list ap;
 580         va_start(ap, repo);
 581         trace2_region_enter_printf_va_fl(file, line, category, label, repo,
 582                                          NULL, ap);
 583         va_end(ap);
 584
 585 }
 586
 587 void trace2_region_enter_printf_fl(const char *file, int line,
 588                                    const char *category, const char *label,
 589                                    const struct repository *repo,
 590                                    const char *fmt, ...)
 591 {
 592         va_list ap;
 593
 594         va_start(ap, fmt);
 595         trace2_region_enter_printf_va_fl(file, line, category, label, repo, fmt,
 596                                          ap);
 597         va_end(ap);
 598 }
 599
 600 #ifndef HAVE_VARIADIC_MACROS
 601 void trace2_region_enter_printf(const char *category, const char *label,
 602                                 const struct repository *repo, const char *fmt,
 603                                 ...)
 604 {
 605         va_list ap;
 606
 607         va_start(ap, fmt);
 608         trace2_region_enter_printf_va_fl(NULL, 0, category, label, repo, fmt,
 609                                          ap);
 610         va_end(ap);
 611 }
 612 #endif
 613
 614 void trace2_region_leave_printf_va_fl(const char *file, int line,
 615                                       const char *category, const char *label,
 616                                       const struct repository *repo,
 617                                       const char *fmt, va_list ap)
 618 {
 619         struct tr2_tgt *tgt_j;
 620         int j;
 621         uint64_t us_now;
 622         uint64_t us_elapsed_absolute;
 623         uint64_t us_elapsed_region;
 624
 625         if (!trace2_enabled)
 626                 return;
 627
 628         us_now = getnanotime() / 1000;
 629         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 630
 631         /*
 632          * Get the elapsed time in the current region before we
 633          * pop it off the stack.  Pop the stack.  And then print
 634          * the perf message at the new (shallower) level so that
 635          * it lines up with the corresponding push/enter.
 636          */
 637         us_elapsed_region = tr2tls_region_elasped_self(us_now);
 638
 639         tr2tls_pop_self();
 640
 641         /*
 642          * We expect each target function to treat 'ap' as constant
 643          * and use va_copy.
 644          */
 645         for_each_wanted_builtin (j, tgt_j)
 646                 if (tgt_j->pfn_region_leave_printf_va_fl)
 647                         tgt_j->pfn_region_leave_printf_va_fl(
 648                                 file, line, us_elapsed_absolute,
 649                                 us_elapsed_region, category, label, repo, fmt,
 650                                 ap);
 651 }
 652
 653 void trace2_region_leave_fl(const char *file, int line, const char *category,
 654                             const char *label, const struct repository *repo, ...)
 655 {
 656         va_list ap;
 657         va_start(ap, repo);
 658         trace2_region_leave_printf_va_fl(file, line, category, label, repo,
 659                                          NULL, ap);
 660         va_end(ap);
 661 }
 662
 663 void trace2_region_leave_printf_fl(const char *file, int line,
 664                                    const char *category, const char *label,
 665                                    const struct repository *repo,
 666                                    const char *fmt, ...)
 667 {
 668         va_list ap;
 669
 670         va_start(ap, fmt);
 671         trace2_region_leave_printf_va_fl(file, line, category, label, repo, fmt,
 672                                          ap);
 673         va_end(ap);
 674 }
 675
 676 #ifndef HAVE_VARIADIC_MACROS
 677 void trace2_region_leave_printf(const char *category, const char *label,
 678                                 const struct repository *repo, const char *fmt,
 679                                 ...)
 680 {
 681         va_list ap;
 682
 683         va_start(ap, fmt);
 684         trace2_region_leave_printf_va_fl(NULL, 0, category, label, repo, fmt,
 685                                          ap);
 686         va_end(ap);
 687 }
 688 #endif
 689
 690 void trace2_data_string_fl(const char *file, int line, const char *category,
 691                            const struct repository *repo, const char *key,
 692                            const char *value)
 693 {
 694         struct tr2_tgt *tgt_j;
 695         int j;
 696         uint64_t us_now;
 697         uint64_t us_elapsed_absolute;
 698         uint64_t us_elapsed_region;
 699
 700         if (!trace2_enabled)
 701                 return;
 702
 703         us_now = getnanotime() / 1000;
 704         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 705         us_elapsed_region = tr2tls_region_elasped_self(us_now);
 706
 707         for_each_wanted_builtin (j, tgt_j)
 708                 if (tgt_j->pfn_data_fl)
 709                         tgt_j->pfn_data_fl(file, line, us_elapsed_absolute,
 710                                            us_elapsed_region, category, repo,
 711                                            key, value);
 712 }
 713
 714 void trace2_data_intmax_fl(const char *file, int line, const char *category,
 715                            const struct repository *repo, const char *key,
 716                            intmax_t value)
 717 {
 718         struct strbuf buf_string = STRBUF_INIT;
 719
 720         if (!trace2_enabled)
 721                 return;
 722
 723         strbuf_addf(&buf_string, "%" PRIdMAX, value);
 724         trace2_data_string_fl(file, line, category, repo, key, buf_string.buf);
 725         strbuf_release(&buf_string);
 726 }
 727
 728 void trace2_data_json_fl(const char *file, int line, const char *category,
 729                          const struct repository *repo, const char *key,
 730                          const struct json_writer *value)
 731 {
 732         struct tr2_tgt *tgt_j;
 733         int j;
 734         uint64_t us_now;
 735         uint64_t us_elapsed_absolute;
 736         uint64_t us_elapsed_region;
 737
 738         if (!trace2_enabled)
 739                 return;
 740
 741         us_now = getnanotime() / 1000;
 742         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 743         us_elapsed_region = tr2tls_region_elasped_self(us_now);
 744
 745         for_each_wanted_builtin (j, tgt_j)
 746                 if (tgt_j->pfn_data_json_fl)
 747                         tgt_j->pfn_data_json_fl(file, line, us_elapsed_absolute,
 748                                                 us_elapsed_region, category,
 749                                                 repo, key, value);
 750 }
 751
 752 void trace2_printf_va_fl(const char *file, int line, const char *fmt,
 753                          va_list ap)
 754 {
 755         struct tr2_tgt *tgt_j;
 756         int j;
 757         uint64_t us_now;
 758         uint64_t us_elapsed_absolute;
 759
 760         if (!trace2_enabled)
 761                 return;
 762
 763         us_now = getnanotime() / 1000;
 764         us_elapsed_absolute = tr2tls_absolute_elapsed(us_now);
 765
 766         /*
 767          * We expect each target function to treat 'ap' as constant
 768          * and use va_copy.
 769          */
 770         for_each_wanted_builtin (j, tgt_j)
 771                 if (tgt_j->pfn_printf_va_fl)
 772                         tgt_j->pfn_printf_va_fl(file, line, us_elapsed_absolute,
 773                                                 fmt, ap);
 774 }
 775
 776 void trace2_printf_fl(const char *file, int line, const char *fmt, ...)
 777 {
 778         va_list ap;
 779
 780         va_start(ap, fmt);
 781         trace2_printf_va_fl(file, line, fmt, ap);
 782         va_end(ap);
 783 }
 784
 785 #ifndef HAVE_VARIADIC_MACROS
 786 void trace2_printf(const char *fmt, ...)
 787 {
 788         va_list ap;
 789
 790         va_start(ap, fmt);
 791         trace2_printf_va_fl(NULL, 0, fmt, ap);
 792         va_end(ap);
 793 }
 794 #endif
 795
 796 const char *trace2_session_id(void)
 797 {
 798         return tr2_sid_get();
 799 }