libsanitizer/tsan/tsan_rtl.cc

   1 //===-- tsan_rtl.cc -------------------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of ThreadSanitizer (TSan), a race detector.
   9 //
  10 // Main file (entry points) for the TSan run-time.
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "sanitizer_common/sanitizer_atomic.h"
  14 #include "sanitizer_common/sanitizer_common.h"
  15 #include "sanitizer_common/sanitizer_libc.h"
  16 #include "sanitizer_common/sanitizer_stackdepot.h"
  17 #include "sanitizer_common/sanitizer_placement_new.h"
  18 #include "sanitizer_common/sanitizer_symbolizer.h"
  19 #include "tsan_defs.h"
  20 #include "tsan_platform.h"
  21 #include "tsan_rtl.h"
  22 #include "tsan_mman.h"
  23 #include "tsan_suppressions.h"
  24
  25 volatile int __tsan_resumed = 0;
  26
  27 extern "C" void __tsan_resume() {
  28   __tsan_resumed = 1;
  29 }
  30
  31 namespace __tsan {
  32
  33 #ifndef TSAN_GO
  34 THREADLOCAL char cur_thread_placeholder[sizeof(ThreadState)] ALIGNED(64);
  35 #endif
  36 static char ctx_placeholder[sizeof(Context)] ALIGNED(64);
  37
  38 static Context *ctx;
  39 Context *CTX() {
  40   return ctx;
  41 }
  42
  43 Context::Context()
  44   : initialized()
  45   , report_mtx(MutexTypeReport, StatMtxReport)
  46   , nreported()
  47   , nmissed_expected()
  48   , thread_mtx(MutexTypeThreads, StatMtxThreads)
  49   , racy_stacks(MBlockRacyStacks)
  50   , racy_addresses(MBlockRacyAddresses)
  51   , fired_suppressions(MBlockRacyAddresses) {
  52 }
  53
  54 // The objects are allocated in TLS, so one may rely on zero-initialization.
  55 ThreadState::ThreadState(Context *ctx, int tid, int unique_id, u64 epoch,
  56                          uptr stk_addr, uptr stk_size,
  57                          uptr tls_addr, uptr tls_size)
  58   : fast_state(tid, epoch)
  59   // Do not touch these, rely on zero initialization,
  60   // they may be accessed before the ctor.
  61   // , fast_ignore_reads()
  62   // , fast_ignore_writes()
  63   // , in_rtl()
  64   , shadow_stack_pos(&shadow_stack[0])
  65   , tid(tid)
  66   , unique_id(unique_id)
  67   , stk_addr(stk_addr)
  68   , stk_size(stk_size)
  69   , tls_addr(tls_addr)
  70   , tls_size(tls_size) {
  71 }
  72
  73 ThreadContext::ThreadContext(int tid)
  74   : tid(tid)
  75   , unique_id()
  76   , os_id()
  77   , user_id()
  78   , thr()
  79   , status(ThreadStatusInvalid)
  80   , detached()
  81   , reuse_count()
  82   , epoch0()
  83   , epoch1()
  84   , dead_info()
  85   , dead_next() {
  86 }
  87
  88 static void WriteMemoryProfile(char *buf, uptr buf_size, int num) {
  89   uptr shadow = GetShadowMemoryConsumption();
  90
  91   int nthread = 0;
  92   int nlivethread = 0;
  93   uptr threadmem = 0;
  94   {
  95     Lock l(&ctx->thread_mtx);
  96     for (unsigned i = 0; i < kMaxTid; i++) {
  97       ThreadContext *tctx = ctx->threads[i];
  98       if (tctx == 0)
  99         continue;
 100       nthread += 1;
 101       threadmem += sizeof(ThreadContext);
 102       if (tctx->status != ThreadStatusRunning)
 103         continue;
 104       nlivethread += 1;
 105       threadmem += sizeof(ThreadState);
 106     }
 107   }
 108
 109   uptr nsync = 0;
 110   uptr syncmem = CTX()->synctab.GetMemoryConsumption(&nsync);
 111
 112   internal_snprintf(buf, buf_size, "%d: shadow=%zuMB"
 113                                    " thread=%zuMB(total=%d/live=%d)"
 114                                    " sync=%zuMB(cnt=%zu)\n",
 115     num,
 116     shadow >> 20,
 117     threadmem >> 20, nthread, nlivethread,
 118     syncmem >> 20, nsync);
 119 }
 120
 121 static void MemoryProfileThread(void *arg) {
 122   ScopedInRtl in_rtl;
 123   fd_t fd = (fd_t)(uptr)arg;
 124   for (int i = 0; ; i++) {
 125     InternalScopedBuffer<char> buf(4096);
 126     WriteMemoryProfile(buf.data(), buf.size(), i);
 127     internal_write(fd, buf.data(), internal_strlen(buf.data()));
 128     SleepForSeconds(1);
 129   }
 130 }
 131
 132 static void InitializeMemoryProfile() {
 133   if (flags()->profile_memory == 0 || flags()->profile_memory[0] == 0)
 134     return;
 135   InternalScopedBuffer<char> filename(4096);
 136   internal_snprintf(filename.data(), filename.size(), "%s.%d",
 137       flags()->profile_memory, GetPid());
 138   fd_t fd = internal_open(filename.data(), true);
 139   if (fd == kInvalidFd) {
 140     Printf("Failed to open memory profile file '%s'\n", &filename[0]);
 141     Die();
 142   }
 143   internal_start_thread(&MemoryProfileThread, (void*)(uptr)fd);
 144 }
 145
 146 static void MemoryFlushThread(void *arg) {
 147   ScopedInRtl in_rtl;
 148   for (int i = 0; ; i++) {
 149     SleepForMillis(flags()->flush_memory_ms);
 150     FlushShadowMemory();
 151   }
 152 }
 153
 154 static void InitializeMemoryFlush() {
 155   if (flags()->flush_memory_ms == 0)
 156     return;
 157   if (flags()->flush_memory_ms < 100)
 158     flags()->flush_memory_ms = 100;
 159   internal_start_thread(&MemoryFlushThread, 0);
 160 }
 161
 162 void MapShadow(uptr addr, uptr size) {
 163   MmapFixedNoReserve(MemToShadow(addr), size * kShadowMultiplier);
 164 }
 165
 166 void Initialize(ThreadState *thr) {
 167   // Thread safe because done before all threads exist.
 168   static bool is_initialized = false;
 169   if (is_initialized)
 170     return;
 171   is_initialized = true;
 172   // Install tool-specific callbacks in sanitizer_common.
 173   SetCheckFailedCallback(TsanCheckFailed);
 174
 175   ScopedInRtl in_rtl;
 176 #ifndef TSAN_GO
 177   InitializeAllocator();
 178 #endif
 179   InitializeInterceptors();
 180   const char *env = InitializePlatform();
 181   InitializeMutex();
 182   InitializeDynamicAnnotations();
 183   ctx = new(ctx_placeholder) Context;
 184 #ifndef TSAN_GO
 185   InitializeShadowMemory();
 186 #endif
 187   ctx->dead_list_size = 0;
 188   ctx->dead_list_head = 0;
 189   ctx->dead_list_tail = 0;
 190   InitializeFlags(&ctx->flags, env);
 191   // Setup correct file descriptor for error reports.
 192   __sanitizer_set_report_fd(flags()->log_fileno);
 193   InitializeSuppressions();
 194 #ifndef TSAN_GO
 195   // Initialize external symbolizer before internal threads are started.
 196   const char *external_symbolizer = flags()->external_symbolizer_path;
 197   if (external_symbolizer != 0 && external_symbolizer[0] != '\0') {
 198     if (!InitializeExternalSymbolizer(external_symbolizer)) {
 199       Printf("Failed to start external symbolizer: '%s'\n",
 200              external_symbolizer);
 201       Die();
 202     }
 203   }
 204 #endif
 205   InitializeMemoryProfile();
 206   InitializeMemoryFlush();
 207
 208   if (ctx->flags.verbosity)
 209     Printf("***** Running under ThreadSanitizer v2 (pid %d) *****\n",
 210                GetPid());
 211
 212   // Initialize thread 0.
 213   ctx->thread_seq = 0;
 214   int tid = ThreadCreate(thr, 0, 0, true);
 215   CHECK_EQ(tid, 0);
 216   ThreadStart(thr, tid, GetPid());
 217   CHECK_EQ(thr->in_rtl, 1);
 218   ctx->initialized = true;
 219
 220   if (flags()->stop_on_start) {
 221     Printf("ThreadSanitizer is suspended at startup (pid %d)."
 222            " Call __tsan_resume().\n",
 223            GetPid());
 224     while (__tsan_resumed == 0);
 225   }
 226 }
 227
 228 int Finalize(ThreadState *thr) {
 229   ScopedInRtl in_rtl;
 230   Context *ctx = __tsan::ctx;
 231   bool failed = false;
 232
 233   if (flags()->atexit_sleep_ms > 0 && ThreadCount(thr) > 1)
 234     SleepForMillis(flags()->atexit_sleep_ms);
 235
 236   // Wait for pending reports.
 237   ctx->report_mtx.Lock();
 238   ctx->report_mtx.Unlock();
 239
 240   ThreadFinalize(thr);
 241
 242   if (ctx->nreported) {
 243     failed = true;
 244 #ifndef TSAN_GO
 245     Printf("ThreadSanitizer: reported %d warnings\n", ctx->nreported);
 246 #else
 247     Printf("Found %d data race(s)\n", ctx->nreported);
 248 #endif
 249   }
 250
 251   if (ctx->nmissed_expected) {
 252     failed = true;
 253     Printf("ThreadSanitizer: missed %d expected races\n",
 254         ctx->nmissed_expected);
 255   }
 256
 257   StatAggregate(ctx->stat, thr->stat);
 258   StatOutput(ctx->stat);
 259   return failed ? flags()->exitcode : 0;
 260 }
 261
 262 #ifndef TSAN_GO
 263 u32 CurrentStackId(ThreadState *thr, uptr pc) {
 264   if (thr->shadow_stack_pos == 0)  // May happen during bootstrap.
 265     return 0;
 266   if (pc) {
 267     thr->shadow_stack_pos[0] = pc;
 268     thr->shadow_stack_pos++;
 269   }
 270   u32 id = StackDepotPut(thr->shadow_stack,
 271                          thr->shadow_stack_pos - thr->shadow_stack);
 272   if (pc)
 273     thr->shadow_stack_pos--;
 274   return id;
 275 }
 276 #endif
 277
 278 void TraceSwitch(ThreadState *thr) {
 279   thr->nomalloc++;
 280   ScopedInRtl in_rtl;
 281   Lock l(&thr->trace.mtx);
 282   unsigned trace = (thr->fast_state.epoch() / kTracePartSize) % kTraceParts;
 283   TraceHeader *hdr = &thr->trace.headers[trace];
 284   hdr->epoch0 = thr->fast_state.epoch();
 285   hdr->stack0.ObtainCurrent(thr, 0);
 286   thr->nomalloc--;
 287 }
 288
 289 #ifndef TSAN_GO
 290 extern "C" void __tsan_trace_switch() {
 291   TraceSwitch(cur_thread());
 292 }
 293
 294 extern "C" void __tsan_report_race() {
 295   ReportRace(cur_thread());
 296 }
 297 #endif
 298
 299 ALWAYS_INLINE
 300 static Shadow LoadShadow(u64 *p) {
 301   u64 raw = atomic_load((atomic_uint64_t*)p, memory_order_relaxed);
 302   return Shadow(raw);
 303 }
 304
 305 ALWAYS_INLINE
 306 static void StoreShadow(u64 *sp, u64 s) {
 307   atomic_store((atomic_uint64_t*)sp, s, memory_order_relaxed);
 308 }
 309
 310 ALWAYS_INLINE
 311 static void StoreIfNotYetStored(u64 *sp, u64 *s) {
 312   StoreShadow(sp, *s);
 313   *s = 0;
 314 }
 315
 316 static inline void HandleRace(ThreadState *thr, u64 *shadow_mem,
 317                               Shadow cur, Shadow old) {
 318   thr->racy_state[0] = cur.raw();
 319   thr->racy_state[1] = old.raw();
 320   thr->racy_shadow_addr = shadow_mem;
 321 #ifndef TSAN_GO
 322   HACKY_CALL(__tsan_report_race);
 323 #else
 324   ReportRace(thr);
 325 #endif
 326 }
 327
 328 static inline bool BothReads(Shadow s, int kAccessIsWrite) {
 329   return !kAccessIsWrite && !s.is_write();
 330 }
 331
 332 static inline bool OldIsRWNotWeaker(Shadow old, int kAccessIsWrite) {
 333   return old.is_write() || !kAccessIsWrite;
 334 }
 335
 336 static inline bool OldIsRWWeakerOrEqual(Shadow old, int kAccessIsWrite) {
 337   return !old.is_write() || kAccessIsWrite;
 338 }
 339
 340 static inline bool OldIsInSameSynchEpoch(Shadow old, ThreadState *thr) {
 341   return old.epoch() >= thr->fast_synch_epoch;
 342 }
 343
 344 static inline bool HappensBefore(Shadow old, ThreadState *thr) {
 345   return thr->clock.get(old.tid()) >= old.epoch();
 346 }
 347
 348 ALWAYS_INLINE
 349 void MemoryAccessImpl(ThreadState *thr, uptr addr,
 350     int kAccessSizeLog, bool kAccessIsWrite,
 351     u64 *shadow_mem, Shadow cur) {
 352   StatInc(thr, StatMop);
 353   StatInc(thr, kAccessIsWrite ? StatMopWrite : StatMopRead);
 354   StatInc(thr, (StatType)(StatMop1 + kAccessSizeLog));
 355
 356   // This potentially can live in an MMX/SSE scratch register.
 357   // The required intrinsics are:
 358   // __m128i _mm_move_epi64(__m128i*);
 359   // _mm_storel_epi64(u64*, __m128i);
 360   u64 store_word = cur.raw();
 361
 362   // scan all the shadow values and dispatch to 4 categories:
 363   // same, replace, candidate and race (see comments below).
 364   // we consider only 3 cases regarding access sizes:
 365   // equal, intersect and not intersect. initially I considered
 366   // larger and smaller as well, it allowed to replace some
 367   // 'candidates' with 'same' or 'replace', but I think
 368   // it's just not worth it (performance- and complexity-wise).
 369
 370   Shadow old(0);
 371   if (kShadowCnt == 1) {
 372     int idx = 0;
 373 #include "tsan_update_shadow_word_inl.h"
 374   } else if (kShadowCnt == 2) {
 375     int idx = 0;
 376 #include "tsan_update_shadow_word_inl.h"
 377     idx = 1;
 378 #include "tsan_update_shadow_word_inl.h"
 379   } else if (kShadowCnt == 4) {
 380     int idx = 0;
 381 #include "tsan_update_shadow_word_inl.h"
 382     idx = 1;
 383 #include "tsan_update_shadow_word_inl.h"
 384     idx = 2;
 385 #include "tsan_update_shadow_word_inl.h"
 386     idx = 3;
 387 #include "tsan_update_shadow_word_inl.h"
 388   } else if (kShadowCnt == 8) {
 389     int idx = 0;
 390 #include "tsan_update_shadow_word_inl.h"
 391     idx = 1;
 392 #include "tsan_update_shadow_word_inl.h"
 393     idx = 2;
 394 #include "tsan_update_shadow_word_inl.h"
 395     idx = 3;
 396 #include "tsan_update_shadow_word_inl.h"
 397     idx = 4;
 398 #include "tsan_update_shadow_word_inl.h"
 399     idx = 5;
 400 #include "tsan_update_shadow_word_inl.h"
 401     idx = 6;
 402 #include "tsan_update_shadow_word_inl.h"
 403     idx = 7;
 404 #include "tsan_update_shadow_word_inl.h"
 405   } else {
 406     CHECK(false);
 407   }
 408
 409   // we did not find any races and had already stored
 410   // the current access info, so we are done
 411   if (LIKELY(store_word == 0))
 412     return;
 413   // choose a random candidate slot and replace it
 414   StoreShadow(shadow_mem + (cur.epoch() % kShadowCnt), store_word);
 415   StatInc(thr, StatShadowReplace);
 416   return;
 417  RACE:
 418   HandleRace(thr, shadow_mem, cur, old);
 419   return;
 420 }
 421
 422 ALWAYS_INLINE
 423 void MemoryAccess(ThreadState *thr, uptr pc, uptr addr,
 424     int kAccessSizeLog, bool kAccessIsWrite) {
 425   u64 *shadow_mem = (u64*)MemToShadow(addr);
 426   DPrintf2("#%d: tsan::OnMemoryAccess: @%p %p size=%d"
 427       " is_write=%d shadow_mem=%p {%zx, %zx, %zx, %zx}\n",
 428       (int)thr->fast_state.tid(), (void*)pc, (void*)addr,
 429       (int)(1 << kAccessSizeLog), kAccessIsWrite, shadow_mem,
 430       (uptr)shadow_mem[0], (uptr)shadow_mem[1],
 431       (uptr)shadow_mem[2], (uptr)shadow_mem[3]);
 432 #if TSAN_DEBUG
 433   if (!IsAppMem(addr)) {
 434     Printf("Access to non app mem %zx\n", addr);
 435     DCHECK(IsAppMem(addr));
 436   }
 437   if (!IsShadowMem((uptr)shadow_mem)) {
 438     Printf("Bad shadow addr %p (%zx)\n", shadow_mem, addr);
 439     DCHECK(IsShadowMem((uptr)shadow_mem));
 440   }
 441 #endif
 442
 443   FastState fast_state = thr->fast_state;
 444   if (fast_state.GetIgnoreBit())
 445     return;
 446   fast_state.IncrementEpoch();
 447   thr->fast_state = fast_state;
 448   Shadow cur(fast_state);
 449   cur.SetAddr0AndSizeLog(addr & 7, kAccessSizeLog);
 450   cur.SetWrite(kAccessIsWrite);
 451
 452   // We must not store to the trace if we do not store to the shadow.
 453   // That is, this call must be moved somewhere below.
 454   TraceAddEvent(thr, fast_state.epoch(), EventTypeMop, pc);
 455
 456   MemoryAccessImpl(thr, addr, kAccessSizeLog, kAccessIsWrite,
 457       shadow_mem, cur);
 458 }
 459
 460 static void MemoryRangeSet(ThreadState *thr, uptr pc, uptr addr, uptr size,
 461                            u64 val) {
 462   if (size == 0)
 463     return;
 464   // FIXME: fix me.
 465   uptr offset = addr % kShadowCell;
 466   if (offset) {
 467     offset = kShadowCell - offset;
 468     if (size <= offset)
 469       return;
 470     addr += offset;
 471     size -= offset;
 472   }
 473   DCHECK_EQ(addr % 8, 0);
 474   // If a user passes some insane arguments (memset(0)),
 475   // let it just crash as usual.
 476   if (!IsAppMem(addr) || !IsAppMem(addr + size - 1))
 477     return;
 478   (void)thr;
 479   (void)pc;
 480   // Some programs mmap like hundreds of GBs but actually used a small part.
 481   // So, it's better to report a false positive on the memory
 482   // then to hang here senselessly.
 483   const uptr kMaxResetSize = 4ull*1024*1024*1024;
 484   if (size > kMaxResetSize)
 485     size = kMaxResetSize;
 486   size = (size + (kShadowCell - 1)) & ~(kShadowCell - 1);
 487   u64 *p = (u64*)MemToShadow(addr);
 488   CHECK(IsShadowMem((uptr)p));
 489   CHECK(IsShadowMem((uptr)(p + size * kShadowCnt / kShadowCell - 1)));
 490   // FIXME: may overwrite a part outside the region
 491   for (uptr i = 0; i < size * kShadowCnt / kShadowCell;) {
 492     p[i++] = val;
 493     for (uptr j = 1; j < kShadowCnt; j++)
 494       p[i++] = 0;
 495   }
 496 }
 497
 498 void MemoryResetRange(ThreadState *thr, uptr pc, uptr addr, uptr size) {
 499   MemoryRangeSet(thr, pc, addr, size, 0);
 500 }
 501
 502 void MemoryRangeFreed(ThreadState *thr, uptr pc, uptr addr, uptr size) {
 503   MemoryAccessRange(thr, pc, addr, size, true);
 504   Shadow s(thr->fast_state);
 505   s.MarkAsFreed();
 506   s.SetWrite(true);
 507   s.SetAddr0AndSizeLog(0, 3);
 508   MemoryRangeSet(thr, pc, addr, size, s.raw());
 509 }
 510
 511 void MemoryRangeImitateWrite(ThreadState *thr, uptr pc, uptr addr, uptr size) {
 512   Shadow s(thr->fast_state);
 513   s.SetWrite(true);
 514   s.SetAddr0AndSizeLog(0, 3);
 515   MemoryRangeSet(thr, pc, addr, size, s.raw());
 516 }
 517
 518 ALWAYS_INLINE
 519 void FuncEntry(ThreadState *thr, uptr pc) {
 520   DCHECK_EQ(thr->in_rtl, 0);
 521   StatInc(thr, StatFuncEnter);
 522   DPrintf2("#%d: FuncEntry %p\n", (int)thr->fast_state.tid(), (void*)pc);
 523   thr->fast_state.IncrementEpoch();
 524   TraceAddEvent(thr, thr->fast_state.epoch(), EventTypeFuncEnter, pc);
 525
 526   // Shadow stack maintenance can be replaced with
 527   // stack unwinding during trace switch (which presumably must be faster).
 528   DCHECK_GE(thr->shadow_stack_pos, &thr->shadow_stack[0]);
 529 #ifndef TSAN_GO
 530   DCHECK_LT(thr->shadow_stack_pos, &thr->shadow_stack[kShadowStackSize]);
 531 #else
 532   if (thr->shadow_stack_pos == thr->shadow_stack_end) {
 533     const int sz = thr->shadow_stack_end - thr->shadow_stack;
 534     const int newsz = 2 * sz;
 535     uptr *newstack = (uptr*)internal_alloc(MBlockShadowStack,
 536         newsz * sizeof(uptr));
 537     internal_memcpy(newstack, thr->shadow_stack, sz * sizeof(uptr));
 538     internal_free(thr->shadow_stack);
 539     thr->shadow_stack = newstack;
 540     thr->shadow_stack_pos = newstack + sz;
 541     thr->shadow_stack_end = newstack + newsz;
 542   }
 543 #endif
 544   thr->shadow_stack_pos[0] = pc;
 545   thr->shadow_stack_pos++;
 546 }
 547
 548 ALWAYS_INLINE
 549 void FuncExit(ThreadState *thr) {
 550   DCHECK_EQ(thr->in_rtl, 0);
 551   StatInc(thr, StatFuncExit);
 552   DPrintf2("#%d: FuncExit\n", (int)thr->fast_state.tid());
 553   thr->fast_state.IncrementEpoch();
 554   TraceAddEvent(thr, thr->fast_state.epoch(), EventTypeFuncExit, 0);
 555
 556   DCHECK_GT(thr->shadow_stack_pos, &thr->shadow_stack[0]);
 557 #ifndef TSAN_GO
 558   DCHECK_LT(thr->shadow_stack_pos, &thr->shadow_stack[kShadowStackSize]);
 559 #endif
 560   thr->shadow_stack_pos--;
 561 }
 562
 563 void IgnoreCtl(ThreadState *thr, bool write, bool begin) {
 564   DPrintf("#%d: IgnoreCtl(%d, %d)\n", thr->tid, write, begin);
 565   thr->ignore_reads_and_writes += begin ? 1 : -1;
 566   CHECK_GE(thr->ignore_reads_and_writes, 0);
 567   if (thr->ignore_reads_and_writes)
 568     thr->fast_state.SetIgnoreBit();
 569   else
 570     thr->fast_state.ClearIgnoreBit();
 571 }
 572
 573 bool MD5Hash::operator==(const MD5Hash &other) const {
 574   return hash[0] == other.hash[0] && hash[1] == other.hash[1];
 575 }
 576
 577 #if TSAN_DEBUG
 578 void build_consistency_debug() {}
 579 #else
 580 void build_consistency_release() {}
 581 #endif
 582
 583 #if TSAN_COLLECT_STATS
 584 void build_consistency_stats() {}
 585 #else
 586 void build_consistency_nostats() {}
 587 #endif
 588
 589 #if TSAN_SHADOW_COUNT == 1
 590 void build_consistency_shadow1() {}
 591 #elif TSAN_SHADOW_COUNT == 2
 592 void build_consistency_shadow2() {}
 593 #elif TSAN_SHADOW_COUNT == 4
 594 void build_consistency_shadow4() {}
 595 #else
 596 void build_consistency_shadow8() {}
 597 #endif
 598
 599 }  // namespace __tsan
 600
 601 #ifndef TSAN_GO
 602 // Must be included in this file to make sure everything is inlined.
 603 #include "tsan_interface_inl.h"
 604 #endif