lib/tsan/rtl/tsan_rtl.cc

   1 //===-- tsan_rtl.cc -------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is a part of ThreadSanitizer (TSan), a race detector.
  11 //
  12 // Main file (entry points) for the TSan run-time.
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "sanitizer_common/sanitizer_atomic.h"
  16 #include "sanitizer_common/sanitizer_common.h"
  17 #include "sanitizer_common/sanitizer_libc.h"
  18 #include "sanitizer_common/sanitizer_stackdepot.h"
  19 #include "sanitizer_common/sanitizer_placement_new.h"
  20 #include "sanitizer_common/sanitizer_symbolizer.h"
  21 #include "tsan_defs.h"
  22 #include "tsan_platform.h"
  23 #include "tsan_rtl.h"
  24 #include "tsan_mman.h"
  25 #include "tsan_suppressions.h"
  26
  27 volatile int __tsan_resumed = 0;
  28
  29 extern "C" void __tsan_resume() {
  30   __tsan_resumed = 1;
  31 }
  32
  33 namespace __tsan {
  34
  35 #ifndef TSAN_GO
  36 THREADLOCAL char cur_thread_placeholder[sizeof(ThreadState)] ALIGNED(64);
  37 #endif
  38 static char ctx_placeholder[sizeof(Context)] ALIGNED(64);
  39
  40 // Can be overriden by a front-end.
  41 bool CPP_WEAK OnFinalize(bool failed) {
  42   return failed;
  43 }
  44
  45 static Context *ctx;
  46 Context *CTX() {
  47   return ctx;
  48 }
  49
  50 Context::Context()
  51   : initialized()
  52   , report_mtx(MutexTypeReport, StatMtxReport)
  53   , nreported()
  54   , nmissed_expected()
  55   , thread_mtx(MutexTypeThreads, StatMtxThreads)
  56   , racy_stacks(MBlockRacyStacks)
  57   , racy_addresses(MBlockRacyAddresses)
  58   , fired_suppressions(MBlockRacyAddresses) {
  59 }
  60
  61 // The objects are allocated in TLS, so one may rely on zero-initialization.
  62 ThreadState::ThreadState(Context *ctx, int tid, int unique_id, u64 epoch,
  63                          uptr stk_addr, uptr stk_size,
  64                          uptr tls_addr, uptr tls_size)
  65   : fast_state(tid, epoch)
  66   // Do not touch these, rely on zero initialization,
  67   // they may be accessed before the ctor.
  68   // , fast_ignore_reads()
  69   // , fast_ignore_writes()
  70   // , in_rtl()
  71   , shadow_stack_pos(&shadow_stack[0])
  72   , tid(tid)
  73   , unique_id(unique_id)
  74   , stk_addr(stk_addr)
  75   , stk_size(stk_size)
  76   , tls_addr(tls_addr)
  77   , tls_size(tls_size) {
  78 }
  79
  80 ThreadContext::ThreadContext(int tid)
  81   : tid(tid)
  82   , unique_id()
  83   , os_id()
  84   , user_id()
  85   , thr()
  86   , status(ThreadStatusInvalid)
  87   , detached()
  88   , reuse_count()
  89   , epoch0()
  90   , epoch1()
  91   , dead_info()
  92   , dead_next()
  93   , name() {
  94 }
  95
  96 static void WriteMemoryProfile(char *buf, uptr buf_size, int num) {
  97   uptr shadow = GetShadowMemoryConsumption();
  98
  99   int nthread = 0;
 100   int nlivethread = 0;
 101   uptr threadmem = 0;
 102   {
 103     Lock l(&ctx->thread_mtx);
 104     for (unsigned i = 0; i < kMaxTid; i++) {
 105       ThreadContext *tctx = ctx->threads[i];
 106       if (tctx == 0)
 107         continue;
 108       nthread += 1;
 109       threadmem += sizeof(ThreadContext);
 110       if (tctx->status != ThreadStatusRunning)
 111         continue;
 112       nlivethread += 1;
 113       threadmem += sizeof(ThreadState);
 114     }
 115   }
 116
 117   uptr nsync = 0;
 118   uptr syncmem = CTX()->synctab.GetMemoryConsumption(&nsync);
 119
 120   internal_snprintf(buf, buf_size, "%d: shadow=%zuMB"
 121                                    " thread=%zuMB(total=%d/live=%d)"
 122                                    " sync=%zuMB(cnt=%zu)\n",
 123     num,
 124     shadow >> 20,
 125     threadmem >> 20, nthread, nlivethread,
 126     syncmem >> 20, nsync);
 127 }
 128
 129 static void MemoryProfileThread(void *arg) {
 130   ScopedInRtl in_rtl;
 131   fd_t fd = (fd_t)(uptr)arg;
 132   for (int i = 0; ; i++) {
 133     InternalScopedBuffer<char> buf(4096);
 134     WriteMemoryProfile(buf.data(), buf.size(), i);
 135     internal_write(fd, buf.data(), internal_strlen(buf.data()));
 136     SleepForSeconds(1);
 137   }
 138 }
 139
 140 static void InitializeMemoryProfile() {
 141   if (flags()->profile_memory == 0 || flags()->profile_memory[0] == 0)
 142     return;
 143   InternalScopedBuffer<char> filename(4096);
 144   internal_snprintf(filename.data(), filename.size(), "%s.%d",
 145       flags()->profile_memory, GetPid());
 146   fd_t fd = internal_open(filename.data(), true);
 147   if (fd == kInvalidFd) {
 148     Printf("Failed to open memory profile file '%s'\n", &filename[0]);
 149     Die();
 150   }
 151   internal_start_thread(&MemoryProfileThread, (void*)(uptr)fd);
 152 }
 153
 154 static void MemoryFlushThread(void *arg) {
 155   ScopedInRtl in_rtl;
 156   for (int i = 0; ; i++) {
 157     SleepForMillis(flags()->flush_memory_ms);
 158     FlushShadowMemory();
 159   }
 160 }
 161
 162 static void InitializeMemoryFlush() {
 163   if (flags()->flush_memory_ms == 0)
 164     return;
 165   if (flags()->flush_memory_ms < 100)
 166     flags()->flush_memory_ms = 100;
 167   internal_start_thread(&MemoryFlushThread, 0);
 168 }
 169
 170 void MapShadow(uptr addr, uptr size) {
 171   MmapFixedNoReserve(MemToShadow(addr), size * kShadowMultiplier);
 172 }
 173
 174 void MapThreadTrace(uptr addr, uptr size) {
 175   DPrintf("#0: Mapping trace at %p-%p(0x%zx)\n", addr, addr + size, size);
 176   CHECK_GE(addr, kTraceMemBegin);
 177   CHECK_LE(addr + size, kTraceMemBegin + kTraceMemSize);
 178   if (addr != (uptr)MmapFixedNoReserve(addr, size)) {
 179     Printf("FATAL: ThreadSanitizer can not mmap thread trace\n");
 180     Die();
 181   }
 182 }
 183
 184 void Initialize(ThreadState *thr) {
 185   // Thread safe because done before all threads exist.
 186   static bool is_initialized = false;
 187   if (is_initialized)
 188     return;
 189   is_initialized = true;
 190   SanitizerToolName = "ThreadSanitizer";
 191   // Install tool-specific callbacks in sanitizer_common.
 192   SetCheckFailedCallback(TsanCheckFailed);
 193
 194   ScopedInRtl in_rtl;
 195 #ifndef TSAN_GO
 196   InitializeAllocator();
 197 #endif
 198   InitializeInterceptors();
 199   const char *env = InitializePlatform();
 200   InitializeMutex();
 201   InitializeDynamicAnnotations();
 202   ctx = new(ctx_placeholder) Context;
 203 #ifndef TSAN_GO
 204   InitializeShadowMemory();
 205 #endif
 206   ctx->dead_list_size = 0;
 207   ctx->dead_list_head = 0;
 208   ctx->dead_list_tail = 0;
 209   InitializeFlags(&ctx->flags, env);
 210   // Setup correct file descriptor for error reports.
 211   if (internal_strcmp(flags()->log_path, "stdout") == 0)
 212     __sanitizer_set_report_fd(kStdoutFd);
 213   else if (internal_strcmp(flags()->log_path, "stderr") == 0)
 214     __sanitizer_set_report_fd(kStderrFd);
 215   else
 216     __sanitizer_set_report_path(flags()->log_path);
 217   InitializeSuppressions();
 218 #ifndef TSAN_GO
 219   // Initialize external symbolizer before internal threads are started.
 220   const char *external_symbolizer = flags()->external_symbolizer_path;
 221   if (external_symbolizer != 0 && external_symbolizer[0] != '\0') {
 222     if (!InitializeExternalSymbolizer(external_symbolizer)) {
 223       Printf("Failed to start external symbolizer: '%s'\n",
 224              external_symbolizer);
 225       Die();
 226     }
 227   }
 228 #endif
 229   InitializeMemoryProfile();
 230   InitializeMemoryFlush();
 231
 232   if (ctx->flags.verbosity)
 233     Printf("***** Running under ThreadSanitizer v2 (pid %d) *****\n",
 234                GetPid());
 235
 236   // Initialize thread 0.
 237   ctx->thread_seq = 0;
 238   int tid = ThreadCreate(thr, 0, 0, true);
 239   CHECK_EQ(tid, 0);
 240   ThreadStart(thr, tid, GetPid());
 241   CHECK_EQ(thr->in_rtl, 1);
 242   ctx->initialized = true;
 243
 244   if (flags()->stop_on_start) {
 245     Printf("ThreadSanitizer is suspended at startup (pid %d)."
 246            " Call __tsan_resume().\n",
 247            GetPid());
 248     while (__tsan_resumed == 0) {}
 249   }
 250 }
 251
 252 int Finalize(ThreadState *thr) {
 253   ScopedInRtl in_rtl;
 254   Context *ctx = __tsan::ctx;
 255   bool failed = false;
 256
 257   if (flags()->atexit_sleep_ms > 0 && ThreadCount(thr) > 1)
 258     SleepForMillis(flags()->atexit_sleep_ms);
 259
 260   // Wait for pending reports.
 261   ctx->report_mtx.Lock();
 262   ctx->report_mtx.Unlock();
 263
 264 #ifndef TSAN_GO
 265   if (ctx->flags.verbosity)
 266     AllocatorPrintStats();
 267 #endif
 268
 269   ThreadFinalize(thr);
 270
 271   if (ctx->nreported) {
 272     failed = true;
 273 #ifndef TSAN_GO
 274     Printf("ThreadSanitizer: reported %d warnings\n", ctx->nreported);
 275 #else
 276     Printf("Found %d data race(s)\n", ctx->nreported);
 277 #endif
 278   }
 279
 280   if (ctx->nmissed_expected) {
 281     failed = true;
 282     Printf("ThreadSanitizer: missed %d expected races\n",
 283         ctx->nmissed_expected);
 284   }
 285
 286   failed = OnFinalize(failed);
 287
 288   StatAggregate(ctx->stat, thr->stat);
 289   StatOutput(ctx->stat);
 290   return failed ? flags()->exitcode : 0;
 291 }
 292
 293 #ifndef TSAN_GO
 294 u32 CurrentStackId(ThreadState *thr, uptr pc) {
 295   if (thr->shadow_stack_pos == 0)  // May happen during bootstrap.
 296     return 0;
 297   if (pc) {
 298     thr->shadow_stack_pos[0] = pc;
 299     thr->shadow_stack_pos++;
 300   }
 301   u32 id = StackDepotPut(thr->shadow_stack,
 302                          thr->shadow_stack_pos - thr->shadow_stack);
 303   if (pc)
 304     thr->shadow_stack_pos--;
 305   return id;
 306 }
 307 #endif
 308
 309 void TraceSwitch(ThreadState *thr) {
 310   thr->nomalloc++;
 311   ScopedInRtl in_rtl;
 312   Lock l(&thr->trace.mtx);
 313   unsigned trace = (thr->fast_state.epoch() / kTracePartSize) % TraceParts();
 314   TraceHeader *hdr = &thr->trace.headers[trace];
 315   hdr->epoch0 = thr->fast_state.epoch();
 316   hdr->stack0.ObtainCurrent(thr, 0);
 317   hdr->mset0 = thr->mset;
 318   thr->nomalloc--;
 319 }
 320
 321 uptr TraceTopPC(ThreadState *thr) {
 322   Event *events = (Event*)GetThreadTrace(thr->tid);
 323   uptr pc = events[thr->fast_state.GetTracePos()];
 324   return pc;
 325 }
 326
 327 uptr TraceSize() {
 328   return (uptr)(1ull << (kTracePartSizeBits + flags()->history_size + 1));
 329 }
 330
 331 uptr TraceParts() {
 332   return TraceSize() / kTracePartSize;
 333 }
 334
 335 #ifndef TSAN_GO
 336 extern "C" void __tsan_trace_switch() {
 337   TraceSwitch(cur_thread());
 338 }
 339
 340 extern "C" void __tsan_report_race() {
 341   ReportRace(cur_thread());
 342 }
 343 #endif
 344
 345 ALWAYS_INLINE
 346 static Shadow LoadShadow(u64 *p) {
 347   u64 raw = atomic_load((atomic_uint64_t*)p, memory_order_relaxed);
 348   return Shadow(raw);
 349 }
 350
 351 ALWAYS_INLINE
 352 static void StoreShadow(u64 *sp, u64 s) {
 353   atomic_store((atomic_uint64_t*)sp, s, memory_order_relaxed);
 354 }
 355
 356 ALWAYS_INLINE
 357 static void StoreIfNotYetStored(u64 *sp, u64 *s) {
 358   StoreShadow(sp, *s);
 359   *s = 0;
 360 }
 361
 362 static inline void HandleRace(ThreadState *thr, u64 *shadow_mem,
 363                               Shadow cur, Shadow old) {
 364   thr->racy_state[0] = cur.raw();
 365   thr->racy_state[1] = old.raw();
 366   thr->racy_shadow_addr = shadow_mem;
 367 #ifndef TSAN_GO
 368   HACKY_CALL(__tsan_report_race);
 369 #else
 370   ReportRace(thr);
 371 #endif
 372 }
 373
 374 static inline bool OldIsInSameSynchEpoch(Shadow old, ThreadState *thr) {
 375   return old.epoch() >= thr->fast_synch_epoch;
 376 }
 377
 378 static inline bool HappensBefore(Shadow old, ThreadState *thr) {
 379   return thr->clock.get(old.TidWithIgnore()) >= old.epoch();
 380 }
 381
 382 ALWAYS_INLINE
 383 void MemoryAccessImpl(ThreadState *thr, uptr addr,
 384     int kAccessSizeLog, bool kAccessIsWrite, bool kIsAtomic,
 385     u64 *shadow_mem, Shadow cur) {
 386   StatInc(thr, StatMop);
 387   StatInc(thr, kAccessIsWrite ? StatMopWrite : StatMopRead);
 388   StatInc(thr, (StatType)(StatMop1 + kAccessSizeLog));
 389
 390   // This potentially can live in an MMX/SSE scratch register.
 391   // The required intrinsics are:
 392   // __m128i _mm_move_epi64(__m128i*);
 393   // _mm_storel_epi64(u64*, __m128i);
 394   u64 store_word = cur.raw();
 395
 396   // scan all the shadow values and dispatch to 4 categories:
 397   // same, replace, candidate and race (see comments below).
 398   // we consider only 3 cases regarding access sizes:
 399   // equal, intersect and not intersect. initially I considered
 400   // larger and smaller as well, it allowed to replace some
 401   // 'candidates' with 'same' or 'replace', but I think
 402   // it's just not worth it (performance- and complexity-wise).
 403
 404   Shadow old(0);
 405   if (kShadowCnt == 1) {
 406     int idx = 0;
 407 #include "tsan_update_shadow_word_inl.h"
 408   } else if (kShadowCnt == 2) {
 409     int idx = 0;
 410 #include "tsan_update_shadow_word_inl.h"
 411     idx = 1;
 412 #include "tsan_update_shadow_word_inl.h"
 413   } else if (kShadowCnt == 4) {
 414     int idx = 0;
 415 #include "tsan_update_shadow_word_inl.h"
 416     idx = 1;
 417 #include "tsan_update_shadow_word_inl.h"
 418     idx = 2;
 419 #include "tsan_update_shadow_word_inl.h"
 420     idx = 3;
 421 #include "tsan_update_shadow_word_inl.h"
 422   } else if (kShadowCnt == 8) {
 423     int idx = 0;
 424 #include "tsan_update_shadow_word_inl.h"
 425     idx = 1;
 426 #include "tsan_update_shadow_word_inl.h"
 427     idx = 2;
 428 #include "tsan_update_shadow_word_inl.h"
 429     idx = 3;
 430 #include "tsan_update_shadow_word_inl.h"
 431     idx = 4;
 432 #include "tsan_update_shadow_word_inl.h"
 433     idx = 5;
 434 #include "tsan_update_shadow_word_inl.h"
 435     idx = 6;
 436 #include "tsan_update_shadow_word_inl.h"
 437     idx = 7;
 438 #include "tsan_update_shadow_word_inl.h"
 439   } else {
 440     CHECK(false);
 441   }
 442
 443   // we did not find any races and had already stored
 444   // the current access info, so we are done
 445   if (LIKELY(store_word == 0))
 446     return;
 447   // choose a random candidate slot and replace it
 448   StoreShadow(shadow_mem + (cur.epoch() % kShadowCnt), store_word);
 449   StatInc(thr, StatShadowReplace);
 450   return;
 451  RACE:
 452   HandleRace(thr, shadow_mem, cur, old);
 453   return;
 454 }
 455
 456 ALWAYS_INLINE
 457 void MemoryAccess(ThreadState *thr, uptr pc, uptr addr,
 458     int kAccessSizeLog, bool kAccessIsWrite, bool kIsAtomic) {
 459   u64 *shadow_mem = (u64*)MemToShadow(addr);
 460   DPrintf2("#%d: MemoryAccess: @%p %p size=%d"
 461       " is_write=%d shadow_mem=%p {%zx, %zx, %zx, %zx}\n",
 462       (int)thr->fast_state.tid(), (void*)pc, (void*)addr,
 463       (int)(1 << kAccessSizeLog), kAccessIsWrite, shadow_mem,
 464       (uptr)shadow_mem[0], (uptr)shadow_mem[1],
 465       (uptr)shadow_mem[2], (uptr)shadow_mem[3]);
 466 #if TSAN_DEBUG
 467   if (!IsAppMem(addr)) {
 468     Printf("Access to non app mem %zx\n", addr);
 469     DCHECK(IsAppMem(addr));
 470   }
 471   if (!IsShadowMem((uptr)shadow_mem)) {
 472     Printf("Bad shadow addr %p (%zx)\n", shadow_mem, addr);
 473     DCHECK(IsShadowMem((uptr)shadow_mem));
 474   }
 475 #endif
 476
 477   FastState fast_state = thr->fast_state;
 478   if (fast_state.GetIgnoreBit())
 479     return;
 480   fast_state.IncrementEpoch();
 481   thr->fast_state = fast_state;
 482   Shadow cur(fast_state);
 483   cur.SetAddr0AndSizeLog(addr & 7, kAccessSizeLog);
 484   cur.SetWrite(kAccessIsWrite);
 485   cur.SetAtomic(kIsAtomic);
 486
 487   // We must not store to the trace if we do not store to the shadow.
 488   // That is, this call must be moved somewhere below.
 489   TraceAddEvent(thr, fast_state, EventTypeMop, pc);
 490
 491   MemoryAccessImpl(thr, addr, kAccessSizeLog, kAccessIsWrite, kIsAtomic,
 492       shadow_mem, cur);
 493 }
 494
 495 static void MemoryRangeSet(ThreadState *thr, uptr pc, uptr addr, uptr size,
 496                            u64 val) {
 497   if (size == 0)
 498     return;
 499   // FIXME: fix me.
 500   uptr offset = addr % kShadowCell;
 501   if (offset) {
 502     offset = kShadowCell - offset;
 503     if (size <= offset)
 504       return;
 505     addr += offset;
 506     size -= offset;
 507   }
 508   DCHECK_EQ(addr % 8, 0);
 509   // If a user passes some insane arguments (memset(0)),
 510   // let it just crash as usual.
 511   if (!IsAppMem(addr) || !IsAppMem(addr + size - 1))
 512     return;
 513   (void)thr;
 514   (void)pc;
 515   // Some programs mmap like hundreds of GBs but actually used a small part.
 516   // So, it's better to report a false positive on the memory
 517   // then to hang here senselessly.
 518   const uptr kMaxResetSize = 4ull*1024*1024*1024;
 519   if (size > kMaxResetSize)
 520     size = kMaxResetSize;
 521   size = (size + (kShadowCell - 1)) & ~(kShadowCell - 1);
 522   u64 *p = (u64*)MemToShadow(addr);
 523   CHECK(IsShadowMem((uptr)p));
 524   CHECK(IsShadowMem((uptr)(p + size * kShadowCnt / kShadowCell - 1)));
 525   // FIXME: may overwrite a part outside the region
 526   for (uptr i = 0; i < size * kShadowCnt / kShadowCell;) {
 527     p[i++] = val;
 528     for (uptr j = 1; j < kShadowCnt; j++)
 529       p[i++] = 0;
 530   }
 531 }
 532
 533 void MemoryResetRange(ThreadState *thr, uptr pc, uptr addr, uptr size) {
 534   MemoryRangeSet(thr, pc, addr, size, 0);
 535 }
 536
 537 void MemoryRangeFreed(ThreadState *thr, uptr pc, uptr addr, uptr size) {
 538   MemoryAccessRange(thr, pc, addr, size, true);
 539   Shadow s(thr->fast_state);
 540   s.ClearIgnoreBit();
 541   s.MarkAsFreed();
 542   s.SetWrite(true);
 543   s.SetAddr0AndSizeLog(0, 3);
 544   MemoryRangeSet(thr, pc, addr, size, s.raw());
 545 }
 546
 547 void MemoryRangeImitateWrite(ThreadState *thr, uptr pc, uptr addr, uptr size) {
 548   Shadow s(thr->fast_state);
 549   s.ClearIgnoreBit();
 550   s.SetWrite(true);
 551   s.SetAddr0AndSizeLog(0, 3);
 552   MemoryRangeSet(thr, pc, addr, size, s.raw());
 553 }
 554
 555 ALWAYS_INLINE
 556 void FuncEntry(ThreadState *thr, uptr pc) {
 557   DCHECK_EQ(thr->in_rtl, 0);
 558   StatInc(thr, StatFuncEnter);
 559   DPrintf2("#%d: FuncEntry %p\n", (int)thr->fast_state.tid(), (void*)pc);
 560   thr->fast_state.IncrementEpoch();
 561   TraceAddEvent(thr, thr->fast_state, EventTypeFuncEnter, pc);
 562
 563   // Shadow stack maintenance can be replaced with
 564   // stack unwinding during trace switch (which presumably must be faster).
 565   DCHECK_GE(thr->shadow_stack_pos, &thr->shadow_stack[0]);
 566 #ifndef TSAN_GO
 567   DCHECK_LT(thr->shadow_stack_pos, &thr->shadow_stack[kShadowStackSize]);
 568 #else
 569   if (thr->shadow_stack_pos == thr->shadow_stack_end) {
 570     const int sz = thr->shadow_stack_end - thr->shadow_stack;
 571     const int newsz = 2 * sz;
 572     uptr *newstack = (uptr*)internal_alloc(MBlockShadowStack,
 573         newsz * sizeof(uptr));
 574     internal_memcpy(newstack, thr->shadow_stack, sz * sizeof(uptr));
 575     internal_free(thr->shadow_stack);
 576     thr->shadow_stack = newstack;
 577     thr->shadow_stack_pos = newstack + sz;
 578     thr->shadow_stack_end = newstack + newsz;
 579   }
 580 #endif
 581   thr->shadow_stack_pos[0] = pc;
 582   thr->shadow_stack_pos++;
 583 }
 584
 585 ALWAYS_INLINE
 586 void FuncExit(ThreadState *thr) {
 587   DCHECK_EQ(thr->in_rtl, 0);
 588   StatInc(thr, StatFuncExit);
 589   DPrintf2("#%d: FuncExit\n", (int)thr->fast_state.tid());
 590   thr->fast_state.IncrementEpoch();
 591   TraceAddEvent(thr, thr->fast_state, EventTypeFuncExit, 0);
 592
 593   DCHECK_GT(thr->shadow_stack_pos, &thr->shadow_stack[0]);
 594 #ifndef TSAN_GO
 595   DCHECK_LT(thr->shadow_stack_pos, &thr->shadow_stack[kShadowStackSize]);
 596 #endif
 597   thr->shadow_stack_pos--;
 598 }
 599
 600 void IgnoreCtl(ThreadState *thr, bool write, bool begin) {
 601   DPrintf("#%d: IgnoreCtl(%d, %d)\n", thr->tid, write, begin);
 602   thr->ignore_reads_and_writes += begin ? 1 : -1;
 603   CHECK_GE(thr->ignore_reads_and_writes, 0);
 604   if (thr->ignore_reads_and_writes)
 605     thr->fast_state.SetIgnoreBit();
 606   else
 607     thr->fast_state.ClearIgnoreBit();
 608 }
 609
 610 bool MD5Hash::operator==(const MD5Hash &other) const {
 611   return hash[0] == other.hash[0] && hash[1] == other.hash[1];
 612 }
 613
 614 #if TSAN_DEBUG
 615 void build_consistency_debug() {}
 616 #else
 617 void build_consistency_release() {}
 618 #endif
 619
 620 #if TSAN_COLLECT_STATS
 621 void build_consistency_stats() {}
 622 #else
 623 void build_consistency_nostats() {}
 624 #endif
 625
 626 #if TSAN_SHADOW_COUNT == 1
 627 void build_consistency_shadow1() {}
 628 #elif TSAN_SHADOW_COUNT == 2
 629 void build_consistency_shadow2() {}
 630 #elif TSAN_SHADOW_COUNT == 4
 631 void build_consistency_shadow4() {}
 632 #else
 633 void build_consistency_shadow8() {}
 634 #endif
 635
 636 }  // namespace __tsan
 637
 638 #ifndef TSAN_GO
 639 // Must be included in this file to make sure everything is inlined.
 640 #include "tsan_interface_inl.h"
 641 #endif