lib/tsan/rtl/tsan_interceptors.cc

   1 //===-- tsan_interceptors.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 //===----------------------------------------------------------------------===//
  13
  14 #include "sanitizer_common/sanitizer_atomic.h"
  15 #include "sanitizer_common/sanitizer_libc.h"
  16 #include "sanitizer_common/sanitizer_placement_new.h"
  17 #include "sanitizer_common/sanitizer_stacktrace.h"
  18 #include "interception/interception.h"
  19 #include "tsan_interface.h"
  20 #include "tsan_platform.h"
  21 #include "tsan_rtl.h"
  22 #include "tsan_mman.h"
  23
  24 using namespace __tsan;  // NOLINT
  25
  26 const int kSigCount = 128;
  27
  28 struct my_siginfo_t {
  29   int opaque[128];
  30 };
  31
  32 struct sigset_t {
  33   u64 val[1024 / 8 / sizeof(u64)];
  34 };
  35
  36 struct ucontext_t {
  37   uptr opaque[117];
  38 };
  39
  40 extern "C" int pthread_attr_init(void *attr);
  41 extern "C" int pthread_attr_destroy(void *attr);
  42 extern "C" int pthread_attr_getdetachstate(void *attr, int *v);
  43 extern "C" int pthread_attr_setstacksize(void *attr, uptr stacksize);
  44 extern "C" int pthread_attr_getstacksize(void *attr, uptr *stacksize);
  45 extern "C" int pthread_key_create(unsigned *key, void (*destructor)(void* v));
  46 extern "C" int pthread_setspecific(unsigned key, const void *v);
  47 extern "C" int pthread_mutexattr_gettype(void *a, int *type);
  48 extern "C" int pthread_yield();
  49 extern "C" int pthread_sigmask(int how, const sigset_t *set, sigset_t *oldset);
  50 extern "C" int sigfillset(sigset_t *set);
  51 extern "C" void *pthread_self();
  52 extern "C" void _exit(int status);
  53 extern "C" int __cxa_atexit(void (*func)(void *arg), void *arg, void *dso);
  54 extern "C" int *__errno_location();
  55 const int PTHREAD_MUTEX_RECURSIVE = 1;
  56 const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
  57 const int kPthreadAttrSize = 56;
  58 const int EINVAL = 22;
  59 const int EBUSY = 16;
  60 const int EPOLL_CTL_ADD = 1;
  61 const int SIGILL = 4;
  62 const int SIGABRT = 6;
  63 const int SIGFPE = 8;
  64 const int SIGSEGV = 11;
  65 const int SIGPIPE = 13;
  66 const int SIGBUS = 7;
  67 void *const MAP_FAILED = (void*)-1;
  68 const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
  69 const int MAP_FIXED = 0x10;
  70 typedef long long_t;  // NOLINT
  71
  72 // From /usr/include/unistd.h
  73 # define F_ULOCK 0      /* Unlock a previously locked region.  */
  74 # define F_LOCK  1      /* Lock a region for exclusive use.  */
  75 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
  76 # define F_TEST  3      /* Test a region for other processes locks.  */
  77
  78 typedef void (*sighandler_t)(int sig);
  79
  80 #define errno (*__errno_location())
  81
  82 union pthread_attr_t {
  83   char size[kPthreadAttrSize];
  84   void *align;
  85 };
  86
  87 struct sigaction_t {
  88   union {
  89     sighandler_t sa_handler;
  90     void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
  91   };
  92   sigset_t sa_mask;
  93   int sa_flags;
  94   void (*sa_restorer)();
  95 };
  96
  97 const sighandler_t SIG_DFL = (sighandler_t)0;
  98 const sighandler_t SIG_IGN = (sighandler_t)1;
  99 const sighandler_t SIG_ERR = (sighandler_t)-1;
 100 const int SA_SIGINFO = 4;
 101 const int SIG_SETMASK = 2;
 102
 103 namespace std {
 104 struct nothrow_t {};
 105 }  // namespace std
 106
 107 static sigaction_t sigactions[kSigCount];
 108
 109 namespace __tsan {
 110 struct SignalDesc {
 111   bool armed;
 112   bool sigaction;
 113   my_siginfo_t siginfo;
 114   ucontext_t ctx;
 115 };
 116
 117 struct SignalContext {
 118   int in_blocking_func;
 119   int int_signal_send;
 120   int pending_signal_count;
 121   SignalDesc pending_signals[kSigCount];
 122 };
 123 }
 124
 125 static SignalContext *SigCtx(ThreadState *thr) {
 126   SignalContext *ctx = (SignalContext*)thr->signal_ctx;
 127   if (ctx == 0 && thr->is_alive) {
 128     ScopedInRtl in_rtl;
 129     ctx = (SignalContext*)internal_alloc(
 130         MBlockSignal, sizeof(*ctx));
 131     MemoryResetRange(thr, 0, (uptr)ctx, sizeof(*ctx));
 132     internal_memset(ctx, 0, sizeof(*ctx));
 133     thr->signal_ctx = ctx;
 134   }
 135   return ctx;
 136 }
 137
 138 static unsigned g_thread_finalize_key;
 139
 140 class ScopedInterceptor {
 141  public:
 142   ScopedInterceptor(ThreadState *thr, const char *fname, uptr pc);
 143   ~ScopedInterceptor();
 144  private:
 145   ThreadState *const thr_;
 146   const int in_rtl_;
 147 };
 148
 149 ScopedInterceptor::ScopedInterceptor(ThreadState *thr, const char *fname,
 150                                      uptr pc)
 151     : thr_(thr)
 152     , in_rtl_(thr->in_rtl) {
 153   if (thr_->in_rtl == 0) {
 154     Initialize(thr);
 155     FuncEntry(thr, pc);
 156     thr_->in_rtl++;
 157     DPrintf("#%d: intercept %s()\n", thr_->tid, fname);
 158   } else {
 159     thr_->in_rtl++;
 160   }
 161 }
 162
 163 ScopedInterceptor::~ScopedInterceptor() {
 164   thr_->in_rtl--;
 165   if (thr_->in_rtl == 0) {
 166     FuncExit(thr_);
 167     ProcessPendingSignals(thr_);
 168   }
 169   CHECK_EQ(in_rtl_, thr_->in_rtl);
 170 }
 171
 172 #define SCOPED_INTERCEPTOR_RAW(func, ...) \
 173     ThreadState *thr = cur_thread(); \
 174     StatInc(thr, StatInterceptor); \
 175     StatInc(thr, StatInt_##func); \
 176     const uptr caller_pc = GET_CALLER_PC(); \
 177     ScopedInterceptor si(thr, #func, caller_pc); \
 178     /* Subtract one from pc as we need current instruction address */ \
 179     const uptr pc = __sanitizer::StackTrace::GetCurrentPc() - 1; \
 180     (void)pc; \
 181 /**/
 182
 183 #define SCOPED_TSAN_INTERCEPTOR(func, ...) \
 184     SCOPED_INTERCEPTOR_RAW(func, __VA_ARGS__); \
 185     if (REAL(func) == 0) { \
 186       Printf("FATAL: ThreadSanitizer: failed to intercept %s\n", #func); \
 187       Die(); \
 188     } \
 189     if (thr->in_rtl > 1) \
 190       return REAL(func)(__VA_ARGS__); \
 191 /**/
 192
 193 #define TSAN_INTERCEPTOR(ret, func, ...) INTERCEPTOR(ret, func, __VA_ARGS__)
 194 #define TSAN_INTERCEPT(func) INTERCEPT_FUNCTION(func)
 195
 196 #define BLOCK_REAL(name) (BlockingCall(thr), REAL(name))
 197
 198 struct BlockingCall {
 199   explicit BlockingCall(ThreadState *thr)
 200       : ctx(SigCtx(thr)) {
 201     ctx->in_blocking_func++;
 202   }
 203
 204   ~BlockingCall() {
 205     ctx->in_blocking_func--;
 206   }
 207
 208   SignalContext *ctx;
 209 };
 210
 211 TSAN_INTERCEPTOR(unsigned, sleep, unsigned sec) {
 212   SCOPED_TSAN_INTERCEPTOR(sleep, sec);
 213   unsigned res = BLOCK_REAL(sleep)(sec);
 214   AfterSleep(thr, pc);
 215   return res;
 216 }
 217
 218 TSAN_INTERCEPTOR(int, usleep, long_t usec) {
 219   SCOPED_TSAN_INTERCEPTOR(usleep, usec);
 220   int res = BLOCK_REAL(usleep)(usec);
 221   AfterSleep(thr, pc);
 222   return res;
 223 }
 224
 225 TSAN_INTERCEPTOR(int, nanosleep, void *req, void *rem) {
 226   SCOPED_TSAN_INTERCEPTOR(nanosleep, req, rem);
 227   int res = BLOCK_REAL(nanosleep)(req, rem);
 228   AfterSleep(thr, pc);
 229   return res;
 230 }
 231
 232 class AtExitContext {
 233  public:
 234   AtExitContext()
 235     : mtx_(MutexTypeAtExit, StatMtxAtExit)
 236     , pos_() {
 237   }
 238
 239   typedef void(*atexit_t)();
 240
 241   int atexit(ThreadState *thr, uptr pc, atexit_t f) {
 242     Lock l(&mtx_);
 243     if (pos_ == kMaxAtExit)
 244       return 1;
 245     Release(thr, pc, (uptr)this);
 246     stack_[pos_] = f;
 247     pos_++;
 248     return 0;
 249   }
 250
 251   void exit(ThreadState *thr, uptr pc) {
 252     CHECK_EQ(thr->in_rtl, 0);
 253     for (;;) {
 254       atexit_t f = 0;
 255       {
 256         Lock l(&mtx_);
 257         if (pos_) {
 258           pos_--;
 259           f = stack_[pos_];
 260           ScopedInRtl in_rtl;
 261           Acquire(thr, pc, (uptr)this);
 262         }
 263       }
 264       if (f == 0)
 265         break;
 266       DPrintf("#%d: executing atexit func %p\n", thr->tid, f);
 267       CHECK_EQ(thr->in_rtl, 0);
 268       f();
 269     }
 270   }
 271
 272  private:
 273   static const int kMaxAtExit = 128;
 274   Mutex mtx_;
 275   atexit_t stack_[kMaxAtExit];
 276   int pos_;
 277 };
 278
 279 static AtExitContext *atexit_ctx;
 280
 281 static void finalize(void *arg) {
 282   ThreadState * thr = cur_thread();
 283   uptr pc = 0;
 284   atexit_ctx->exit(thr, pc);
 285   {
 286     ScopedInRtl in_rtl;
 287     DestroyAndFree(atexit_ctx);
 288   }
 289   int status = Finalize(cur_thread());
 290   if (status)
 291     _exit(status);
 292 }
 293
 294 TSAN_INTERCEPTOR(int, atexit, void (*f)()) {
 295   SCOPED_TSAN_INTERCEPTOR(atexit, f);
 296   return atexit_ctx->atexit(thr, pc, f);
 297 }
 298
 299 TSAN_INTERCEPTOR(void, longjmp, void *env, int val) {
 300   SCOPED_TSAN_INTERCEPTOR(longjmp, env, val);
 301   Printf("ThreadSanitizer: longjmp() is not supported\n");
 302   Die();
 303 }
 304
 305 TSAN_INTERCEPTOR(void, siglongjmp, void *env, int val) {
 306   SCOPED_TSAN_INTERCEPTOR(siglongjmp, env, val);
 307   Printf("ThreadSanitizer: siglongjmp() is not supported\n");
 308   Die();
 309 }
 310
 311 static uptr fd2addr(int fd) {
 312   (void)fd;
 313   static u64 addr;
 314   return (uptr)&addr;
 315 }
 316
 317 static uptr epollfd2addr(int fd) {
 318   (void)fd;
 319   static u64 addr;
 320   return (uptr)&addr;
 321 }
 322
 323 static uptr file2addr(char *path) {
 324   (void)path;
 325   static u64 addr;
 326   return (uptr)&addr;
 327 }
 328
 329 static uptr dir2addr(char *path) {
 330   (void)path;
 331   static u64 addr;
 332   return (uptr)&addr;
 333 }
 334
 335 TSAN_INTERCEPTOR(void*, malloc, uptr size) {
 336   void *p = 0;
 337   {
 338     SCOPED_INTERCEPTOR_RAW(malloc, size);
 339     p = user_alloc(thr, pc, size);
 340   }
 341   invoke_malloc_hook(p, size);
 342   return p;
 343 }
 344
 345 TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
 346   SCOPED_TSAN_INTERCEPTOR(__libc_memalign, align, sz);
 347   return user_alloc(thr, pc, sz, align);
 348 }
 349
 350 TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
 351   void *p = 0;
 352   {
 353     SCOPED_INTERCEPTOR_RAW(calloc, size, n);
 354     p = user_alloc(thr, pc, n * size);
 355     if (p) internal_memset(p, 0, n * size);
 356   }
 357   invoke_malloc_hook(p, n * size);
 358   return p;
 359 }
 360
 361 TSAN_INTERCEPTOR(void*, realloc, void *p, uptr size) {
 362   if (p)
 363     invoke_free_hook(p);
 364   {
 365     SCOPED_INTERCEPTOR_RAW(realloc, p, size);
 366     p = user_realloc(thr, pc, p, size);
 367   }
 368   invoke_malloc_hook(p, size);
 369   return p;
 370 }
 371
 372 TSAN_INTERCEPTOR(void, free, void *p) {
 373   if (p == 0)
 374     return;
 375   invoke_free_hook(p);
 376   SCOPED_INTERCEPTOR_RAW(free, p);
 377   user_free(thr, pc, p);
 378 }
 379
 380 TSAN_INTERCEPTOR(void, cfree, void *p) {
 381   if (p == 0)
 382     return;
 383   invoke_free_hook(p);
 384   SCOPED_INTERCEPTOR_RAW(cfree, p);
 385   user_free(thr, pc, p);
 386 }
 387
 388 #define OPERATOR_NEW_BODY(mangled_name) \
 389   void *p = 0; \
 390   {  \
 391     SCOPED_INTERCEPTOR_RAW(mangled_name, size); \
 392     p = user_alloc(thr, pc, size); \
 393   }  \
 394   invoke_malloc_hook(p, size);  \
 395   return p;
 396
 397 void *operator new(__sanitizer::uptr size) {
 398   OPERATOR_NEW_BODY(_Znwm);
 399 }
 400 void *operator new[](__sanitizer::uptr size) {
 401   OPERATOR_NEW_BODY(_Znam);
 402 }
 403 void *operator new(__sanitizer::uptr size, std::nothrow_t const&) {
 404   OPERATOR_NEW_BODY(_ZnwmRKSt9nothrow_t);
 405 }
 406 void *operator new[](__sanitizer::uptr size, std::nothrow_t const&) {
 407   OPERATOR_NEW_BODY(_ZnamRKSt9nothrow_t);
 408 }
 409
 410 #define OPERATOR_DELETE_BODY(mangled_name) \
 411   if (ptr == 0) return;  \
 412   invoke_free_hook(ptr);  \
 413   SCOPED_INTERCEPTOR_RAW(mangled_name, ptr);  \
 414   user_free(thr, pc, ptr);
 415
 416 void operator delete(void *ptr) {
 417   OPERATOR_DELETE_BODY(_ZdlPv);
 418 }
 419 void operator delete[](void *ptr) {
 420   OPERATOR_DELETE_BODY(_ZdlPvRKSt9nothrow_t);
 421 }
 422 void operator delete(void *ptr, std::nothrow_t const&) {
 423   OPERATOR_DELETE_BODY(_ZdaPv);
 424 }
 425 void operator delete[](void *ptr, std::nothrow_t const&) {
 426   OPERATOR_DELETE_BODY(_ZdaPvRKSt9nothrow_t);
 427 }
 428
 429 TSAN_INTERCEPTOR(uptr, strlen, const char *s) {
 430   SCOPED_TSAN_INTERCEPTOR(strlen, s);
 431   uptr len = internal_strlen(s);
 432   MemoryAccessRange(thr, pc, (uptr)s, len + 1, false);
 433   return len;
 434 }
 435
 436 TSAN_INTERCEPTOR(void*, memset, void *dst, int v, uptr size) {
 437   SCOPED_TSAN_INTERCEPTOR(memset, dst, v, size);
 438   MemoryAccessRange(thr, pc, (uptr)dst, size, true);
 439   return internal_memset(dst, v, size);
 440 }
 441
 442 TSAN_INTERCEPTOR(void*, memcpy, void *dst, const void *src, uptr size) {
 443   SCOPED_TSAN_INTERCEPTOR(memcpy, dst, src, size);
 444   MemoryAccessRange(thr, pc, (uptr)dst, size, true);
 445   MemoryAccessRange(thr, pc, (uptr)src, size, false);
 446   return internal_memcpy(dst, src, size);
 447 }
 448
 449 TSAN_INTERCEPTOR(int, memcmp, const void *s1, const void *s2, uptr n) {
 450   SCOPED_TSAN_INTERCEPTOR(memcmp, s1, s2, n);
 451   int res = 0;
 452   uptr len = 0;
 453   for (; len < n; len++) {
 454     if ((res = ((unsigned char*)s1)[len] - ((unsigned char*)s2)[len]))
 455       break;
 456   }
 457   MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
 458   MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
 459   return res;
 460 }
 461
 462 TSAN_INTERCEPTOR(int, strcmp, const char *s1, const char *s2) {
 463   SCOPED_TSAN_INTERCEPTOR(strcmp, s1, s2);
 464   uptr len = 0;
 465   for (; s1[len] && s2[len]; len++) {
 466     if (s1[len] != s2[len])
 467       break;
 468   }
 469   MemoryAccessRange(thr, pc, (uptr)s1, len + 1, false);
 470   MemoryAccessRange(thr, pc, (uptr)s2, len + 1, false);
 471   return s1[len] - s2[len];
 472 }
 473
 474 TSAN_INTERCEPTOR(int, strncmp, const char *s1, const char *s2, uptr n) {
 475   SCOPED_TSAN_INTERCEPTOR(strncmp, s1, s2, n);
 476   uptr len = 0;
 477   for (; len < n && s1[len] && s2[len]; len++) {
 478     if (s1[len] != s2[len])
 479       break;
 480   }
 481   MemoryAccessRange(thr, pc, (uptr)s1, len < n ? len + 1 : n, false);
 482   MemoryAccessRange(thr, pc, (uptr)s2, len < n ? len + 1 : n, false);
 483   return len == n ? 0 : s1[len] - s2[len];
 484 }
 485
 486 TSAN_INTERCEPTOR(void*, memchr, void *s, int c, uptr n) {
 487   SCOPED_TSAN_INTERCEPTOR(memchr, s, c, n);
 488   void *res = REAL(memchr)(s, c, n);
 489   uptr len = res ? (char*)res - (char*)s + 1 : n;
 490   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 491   return res;
 492 }
 493
 494 TSAN_INTERCEPTOR(void*, memrchr, char *s, int c, uptr n) {
 495   SCOPED_TSAN_INTERCEPTOR(memrchr, s, c, n);
 496   MemoryAccessRange(thr, pc, (uptr)s, n, false);
 497   return REAL(memrchr)(s, c, n);
 498 }
 499
 500 TSAN_INTERCEPTOR(void*, memmove, void *dst, void *src, uptr n) {
 501   SCOPED_TSAN_INTERCEPTOR(memmove, dst, src, n);
 502   MemoryAccessRange(thr, pc, (uptr)dst, n, true);
 503   MemoryAccessRange(thr, pc, (uptr)src, n, false);
 504   return REAL(memmove)(dst, src, n);
 505 }
 506
 507 TSAN_INTERCEPTOR(char*, strchr, char *s, int c) {
 508   SCOPED_TSAN_INTERCEPTOR(strchr, s, c);
 509   char *res = REAL(strchr)(s, c);
 510   uptr len = res ? (char*)res - (char*)s + 1 : internal_strlen(s) + 1;
 511   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 512   return res;
 513 }
 514
 515 TSAN_INTERCEPTOR(char*, strchrnul, char *s, int c) {
 516   SCOPED_TSAN_INTERCEPTOR(strchrnul, s, c);
 517   char *res = REAL(strchrnul)(s, c);
 518   uptr len = (char*)res - (char*)s + 1;
 519   MemoryAccessRange(thr, pc, (uptr)s, len, false);
 520   return res;
 521 }
 522
 523 TSAN_INTERCEPTOR(char*, strrchr, char *s, int c) {
 524   SCOPED_TSAN_INTERCEPTOR(strrchr, s, c);
 525   MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s) + 1, false);
 526   return REAL(strrchr)(s, c);
 527 }
 528
 529 TSAN_INTERCEPTOR(char*, strcpy, char *dst, const char *src) {  // NOLINT
 530   SCOPED_TSAN_INTERCEPTOR(strcpy, dst, src);  // NOLINT
 531   uptr srclen = internal_strlen(src);
 532   MemoryAccessRange(thr, pc, (uptr)dst, srclen + 1, true);
 533   MemoryAccessRange(thr, pc, (uptr)src, srclen + 1, false);
 534   return REAL(strcpy)(dst, src);  // NOLINT
 535 }
 536
 537 TSAN_INTERCEPTOR(char*, strncpy, char *dst, char *src, uptr n) {
 538   SCOPED_TSAN_INTERCEPTOR(strncpy, dst, src, n);
 539   uptr srclen = internal_strnlen(src, n);
 540   MemoryAccessRange(thr, pc, (uptr)dst, n, true);
 541   MemoryAccessRange(thr, pc, (uptr)src, min(srclen + 1, n), false);
 542   return REAL(strncpy)(dst, src, n);
 543 }
 544
 545 TSAN_INTERCEPTOR(const char*, strstr, const char *s1, const char *s2) {
 546   SCOPED_TSAN_INTERCEPTOR(strstr, s1, s2);
 547   const char *res = REAL(strstr)(s1, s2);
 548   uptr len1 = internal_strlen(s1);
 549   uptr len2 = internal_strlen(s2);
 550   MemoryAccessRange(thr, pc, (uptr)s1, len1 + 1, false);
 551   MemoryAccessRange(thr, pc, (uptr)s2, len2 + 1, false);
 552   return res;
 553 }
 554
 555 static bool fix_mmap_addr(void **addr, long_t sz, int flags) {
 556   if (*addr) {
 557     if (!IsAppMem((uptr)*addr) || !IsAppMem((uptr)*addr + sz - 1)) {
 558       if (flags & MAP_FIXED) {
 559         errno = EINVAL;
 560         return false;
 561       } else {
 562         *addr = 0;
 563       }
 564     }
 565   }
 566   return true;
 567 }
 568
 569 TSAN_INTERCEPTOR(void*, mmap, void *addr, long_t sz, int prot,
 570                          int flags, int fd, unsigned off) {
 571   SCOPED_TSAN_INTERCEPTOR(mmap, addr, sz, prot, flags, fd, off);
 572   if (!fix_mmap_addr(&addr, sz, flags))
 573     return MAP_FAILED;
 574   void *res = REAL(mmap)(addr, sz, prot, flags, fd, off);
 575   if (res != MAP_FAILED) {
 576     MemoryResetRange(thr, pc, (uptr)res, sz);
 577   }
 578   return res;
 579 }
 580
 581 TSAN_INTERCEPTOR(void*, mmap64, void *addr, long_t sz, int prot,
 582                            int flags, int fd, u64 off) {
 583   SCOPED_TSAN_INTERCEPTOR(mmap64, addr, sz, prot, flags, fd, off);
 584   if (!fix_mmap_addr(&addr, sz, flags))
 585     return MAP_FAILED;
 586   void *res = REAL(mmap64)(addr, sz, prot, flags, fd, off);
 587   if (res != MAP_FAILED) {
 588     MemoryResetRange(thr, pc, (uptr)res, sz);
 589   }
 590   return res;
 591 }
 592
 593 TSAN_INTERCEPTOR(int, munmap, void *addr, long_t sz) {
 594   SCOPED_TSAN_INTERCEPTOR(munmap, addr, sz);
 595   int res = REAL(munmap)(addr, sz);
 596   return res;
 597 }
 598
 599 TSAN_INTERCEPTOR(void*, memalign, uptr align, uptr sz) {
 600   SCOPED_TSAN_INTERCEPTOR(memalign, align, sz);
 601   return user_alloc(thr, pc, sz, align);
 602 }
 603
 604 TSAN_INTERCEPTOR(void*, valloc, uptr sz) {
 605   SCOPED_TSAN_INTERCEPTOR(valloc, sz);
 606   return user_alloc(thr, pc, sz, GetPageSizeCached());
 607 }
 608
 609 TSAN_INTERCEPTOR(void*, pvalloc, uptr sz) {
 610   SCOPED_TSAN_INTERCEPTOR(pvalloc, sz);
 611   sz = RoundUp(sz, GetPageSizeCached());
 612   return user_alloc(thr, pc, sz, GetPageSizeCached());
 613 }
 614
 615 TSAN_INTERCEPTOR(int, posix_memalign, void **memptr, uptr align, uptr sz) {
 616   SCOPED_TSAN_INTERCEPTOR(posix_memalign, memptr, align, sz);
 617   *memptr = user_alloc(thr, pc, sz, align);
 618   return 0;
 619 }
 620
 621 // Used in thread-safe function static initialization.
 622 extern "C" int INTERFACE_ATTRIBUTE __cxa_guard_acquire(atomic_uint32_t *g) {
 623   SCOPED_INTERCEPTOR_RAW(__cxa_guard_acquire, g);
 624   for (;;) {
 625     u32 cmp = atomic_load(g, memory_order_acquire);
 626     if (cmp == 0) {
 627       if (atomic_compare_exchange_strong(g, &cmp, 1<<16, memory_order_relaxed))
 628         return 1;
 629     } else if (cmp == 1) {
 630       Acquire(thr, pc, (uptr)g);
 631       return 0;
 632     } else {
 633       internal_sched_yield();
 634     }
 635   }
 636 }
 637
 638 extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_release(atomic_uint32_t *g) {
 639   SCOPED_INTERCEPTOR_RAW(__cxa_guard_release, g);
 640   Release(thr, pc, (uptr)g);
 641   atomic_store(g, 1, memory_order_release);
 642 }
 643
 644 extern "C" void INTERFACE_ATTRIBUTE __cxa_guard_abort(atomic_uint32_t *g) {
 645   SCOPED_INTERCEPTOR_RAW(__cxa_guard_abort, g);
 646   atomic_store(g, 0, memory_order_relaxed);
 647 }
 648
 649 static void thread_finalize(void *v) {
 650   uptr iter = (uptr)v;
 651   if (iter > 1) {
 652     if (pthread_setspecific(g_thread_finalize_key, (void*)(iter - 1))) {
 653       Printf("ThreadSanitizer: failed to set thread key\n");
 654       Die();
 655     }
 656     return;
 657   }
 658   {
 659     ScopedInRtl in_rtl;
 660     ThreadState *thr = cur_thread();
 661     ThreadFinish(thr);
 662     SignalContext *sctx = thr->signal_ctx;
 663     if (sctx) {
 664       thr->signal_ctx = 0;
 665       internal_free(sctx);
 666     }
 667   }
 668 }
 669
 670
 671 struct ThreadParam {
 672   void* (*callback)(void *arg);
 673   void *param;
 674   atomic_uintptr_t tid;
 675 };
 676
 677 extern "C" void *__tsan_thread_start_func(void *arg) {
 678   ThreadParam *p = (ThreadParam*)arg;
 679   void* (*callback)(void *arg) = p->callback;
 680   void *param = p->param;
 681   int tid = 0;
 682   {
 683     ThreadState *thr = cur_thread();
 684     ScopedInRtl in_rtl;
 685     if (pthread_setspecific(g_thread_finalize_key, (void*)4)) {
 686       Printf("ThreadSanitizer: failed to set thread key\n");
 687       Die();
 688     }
 689     while ((tid = atomic_load(&p->tid, memory_order_acquire)) == 0)
 690       pthread_yield();
 691     atomic_store(&p->tid, 0, memory_order_release);
 692     ThreadStart(thr, tid, GetTid());
 693     CHECK_EQ(thr->in_rtl, 1);
 694   }
 695   void *res = callback(param);
 696   // Prevent the callback from being tail called,
 697   // it mixes up stack traces.
 698   volatile int foo = 42;
 699   foo++;
 700   return res;
 701 }
 702
 703 TSAN_INTERCEPTOR(int, pthread_create,
 704     void *th, void *attr, void *(*callback)(void*), void * param) {
 705   SCOPED_TSAN_INTERCEPTOR(pthread_create, th, attr, callback, param);
 706   pthread_attr_t myattr;
 707   if (attr == 0) {
 708     pthread_attr_init(&myattr);
 709     attr = &myattr;
 710   }
 711   int detached = 0;
 712   pthread_attr_getdetachstate(attr, &detached);
 713   uptr stacksize = 0;
 714   pthread_attr_getstacksize(attr, &stacksize);
 715   // We place the huge ThreadState object into TLS, account for that.
 716   const uptr minstacksize = GetTlsSize() + 128*1024;
 717   if (stacksize < minstacksize) {
 718     DPrintf("ThreadSanitizer: stacksize %zu->%zu\n", stacksize, minstacksize);
 719     pthread_attr_setstacksize(attr, minstacksize);
 720   }
 721   ThreadParam p;
 722   p.callback = callback;
 723   p.param = param;
 724   atomic_store(&p.tid, 0, memory_order_relaxed);
 725   int res = REAL(pthread_create)(th, attr, __tsan_thread_start_func, &p);
 726   if (res == 0) {
 727     int tid = ThreadCreate(thr, pc, *(uptr*)th, detached);
 728     CHECK_NE(tid, 0);
 729     atomic_store(&p.tid, tid, memory_order_release);
 730     while (atomic_load(&p.tid, memory_order_acquire) != 0)
 731       pthread_yield();
 732   }
 733   if (attr == &myattr)
 734     pthread_attr_destroy(&myattr);
 735   return res;
 736 }
 737
 738 TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
 739   SCOPED_TSAN_INTERCEPTOR(pthread_join, th, ret);
 740   int tid = ThreadTid(thr, pc, (uptr)th);
 741   int res = BLOCK_REAL(pthread_join)(th, ret);
 742   if (res == 0) {
 743     ThreadJoin(thr, pc, tid);
 744   }
 745   return res;
 746 }
 747
 748 TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
 749   SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
 750   int tid = ThreadTid(thr, pc, (uptr)th);
 751   int res = REAL(pthread_detach)(th);
 752   if (res == 0) {
 753     ThreadDetach(thr, pc, tid);
 754   }
 755   return res;
 756 }
 757
 758 TSAN_INTERCEPTOR(int, pthread_mutex_init, void *m, void *a) {
 759   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_init, m, a);
 760   int res = REAL(pthread_mutex_init)(m, a);
 761   if (res == 0) {
 762     bool recursive = false;
 763     if (a) {
 764       int type = 0;
 765       if (pthread_mutexattr_gettype(a, &type) == 0)
 766         recursive = (type == PTHREAD_MUTEX_RECURSIVE
 767             || type == PTHREAD_MUTEX_RECURSIVE_NP);
 768     }
 769     MutexCreate(thr, pc, (uptr)m, false, recursive, false);
 770   }
 771   return res;
 772 }
 773
 774 TSAN_INTERCEPTOR(int, pthread_mutex_destroy, void *m) {
 775   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_destroy, m);
 776   int res = REAL(pthread_mutex_destroy)(m);
 777   if (res == 0 || res == EBUSY) {
 778     MutexDestroy(thr, pc, (uptr)m);
 779   }
 780   return res;
 781 }
 782
 783 TSAN_INTERCEPTOR(int, pthread_mutex_lock, void *m) {
 784   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_lock, m);
 785   int res = REAL(pthread_mutex_lock)(m);
 786   if (res == 0) {
 787     MutexLock(thr, pc, (uptr)m);
 788   }
 789   return res;
 790 }
 791
 792 TSAN_INTERCEPTOR(int, pthread_mutex_trylock, void *m) {
 793   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_trylock, m);
 794   int res = REAL(pthread_mutex_trylock)(m);
 795   if (res == 0) {
 796     MutexLock(thr, pc, (uptr)m);
 797   }
 798   return res;
 799 }
 800
 801 TSAN_INTERCEPTOR(int, pthread_mutex_timedlock, void *m, void *abstime) {
 802   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_timedlock, m, abstime);
 803   int res = REAL(pthread_mutex_timedlock)(m, abstime);
 804   if (res == 0) {
 805     MutexLock(thr, pc, (uptr)m);
 806   }
 807   return res;
 808 }
 809
 810 TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
 811   SCOPED_TSAN_INTERCEPTOR(pthread_mutex_unlock, m);
 812   MutexUnlock(thr, pc, (uptr)m);
 813   int res = REAL(pthread_mutex_unlock)(m);
 814   return res;
 815 }
 816
 817 TSAN_INTERCEPTOR(int, pthread_spin_init, void *m, int pshared) {
 818   SCOPED_TSAN_INTERCEPTOR(pthread_spin_init, m, pshared);
 819   int res = REAL(pthread_spin_init)(m, pshared);
 820   if (res == 0) {
 821     MutexCreate(thr, pc, (uptr)m, false, false, false);
 822   }
 823   return res;
 824 }
 825
 826 TSAN_INTERCEPTOR(int, pthread_spin_destroy, void *m) {
 827   SCOPED_TSAN_INTERCEPTOR(pthread_spin_destroy, m);
 828   int res = REAL(pthread_spin_destroy)(m);
 829   if (res == 0) {
 830     MutexDestroy(thr, pc, (uptr)m);
 831   }
 832   return res;
 833 }
 834
 835 TSAN_INTERCEPTOR(int, pthread_spin_lock, void *m) {
 836   SCOPED_TSAN_INTERCEPTOR(pthread_spin_lock, m);
 837   int res = REAL(pthread_spin_lock)(m);
 838   if (res == 0) {
 839     MutexLock(thr, pc, (uptr)m);
 840   }
 841   return res;
 842 }
 843
 844 TSAN_INTERCEPTOR(int, pthread_spin_trylock, void *m) {
 845   SCOPED_TSAN_INTERCEPTOR(pthread_spin_trylock, m);
 846   int res = REAL(pthread_spin_trylock)(m);
 847   if (res == 0) {
 848     MutexLock(thr, pc, (uptr)m);
 849   }
 850   return res;
 851 }
 852
 853 TSAN_INTERCEPTOR(int, pthread_spin_unlock, void *m) {
 854   SCOPED_TSAN_INTERCEPTOR(pthread_spin_unlock, m);
 855   MutexUnlock(thr, pc, (uptr)m);
 856   int res = REAL(pthread_spin_unlock)(m);
 857   return res;
 858 }
 859
 860 TSAN_INTERCEPTOR(int, pthread_rwlock_init, void *m, void *a) {
 861   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_init, m, a);
 862   int res = REAL(pthread_rwlock_init)(m, a);
 863   if (res == 0) {
 864     MutexCreate(thr, pc, (uptr)m, true, false, false);
 865   }
 866   return res;
 867 }
 868
 869 TSAN_INTERCEPTOR(int, pthread_rwlock_destroy, void *m) {
 870   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_destroy, m);
 871   int res = REAL(pthread_rwlock_destroy)(m);
 872   if (res == 0) {
 873     MutexDestroy(thr, pc, (uptr)m);
 874   }
 875   return res;
 876 }
 877
 878 TSAN_INTERCEPTOR(int, pthread_rwlock_rdlock, void *m) {
 879   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_rdlock, m);
 880   int res = REAL(pthread_rwlock_rdlock)(m);
 881   if (res == 0) {
 882     MutexReadLock(thr, pc, (uptr)m);
 883   }
 884   return res;
 885 }
 886
 887 TSAN_INTERCEPTOR(int, pthread_rwlock_tryrdlock, void *m) {
 888   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_tryrdlock, m);
 889   int res = REAL(pthread_rwlock_tryrdlock)(m);
 890   if (res == 0) {
 891     MutexReadLock(thr, pc, (uptr)m);
 892   }
 893   return res;
 894 }
 895
 896 TSAN_INTERCEPTOR(int, pthread_rwlock_timedrdlock, void *m, void *abstime) {
 897   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedrdlock, m, abstime);
 898   int res = REAL(pthread_rwlock_timedrdlock)(m, abstime);
 899   if (res == 0) {
 900     MutexReadLock(thr, pc, (uptr)m);
 901   }
 902   return res;
 903 }
 904
 905 TSAN_INTERCEPTOR(int, pthread_rwlock_wrlock, void *m) {
 906   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_wrlock, m);
 907   int res = REAL(pthread_rwlock_wrlock)(m);
 908   if (res == 0) {
 909     MutexLock(thr, pc, (uptr)m);
 910   }
 911   return res;
 912 }
 913
 914 TSAN_INTERCEPTOR(int, pthread_rwlock_trywrlock, void *m) {
 915   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_trywrlock, m);
 916   int res = REAL(pthread_rwlock_trywrlock)(m);
 917   if (res == 0) {
 918     MutexLock(thr, pc, (uptr)m);
 919   }
 920   return res;
 921 }
 922
 923 TSAN_INTERCEPTOR(int, pthread_rwlock_timedwrlock, void *m, void *abstime) {
 924   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_timedwrlock, m, abstime);
 925   int res = REAL(pthread_rwlock_timedwrlock)(m, abstime);
 926   if (res == 0) {
 927     MutexLock(thr, pc, (uptr)m);
 928   }
 929   return res;
 930 }
 931
 932 TSAN_INTERCEPTOR(int, pthread_rwlock_unlock, void *m) {
 933   SCOPED_TSAN_INTERCEPTOR(pthread_rwlock_unlock, m);
 934   MutexReadOrWriteUnlock(thr, pc, (uptr)m);
 935   int res = REAL(pthread_rwlock_unlock)(m);
 936   return res;
 937 }
 938
 939 TSAN_INTERCEPTOR(int, pthread_cond_init, void *c, void *a) {
 940   SCOPED_TSAN_INTERCEPTOR(pthread_cond_init, c, a);
 941   int res = REAL(pthread_cond_init)(c, a);
 942   return res;
 943 }
 944
 945 TSAN_INTERCEPTOR(int, pthread_cond_destroy, void *c) {
 946   SCOPED_TSAN_INTERCEPTOR(pthread_cond_destroy, c);
 947   int res = REAL(pthread_cond_destroy)(c);
 948   return res;
 949 }
 950
 951 TSAN_INTERCEPTOR(int, pthread_cond_signal, void *c) {
 952   SCOPED_TSAN_INTERCEPTOR(pthread_cond_signal, c);
 953   int res = REAL(pthread_cond_signal)(c);
 954   return res;
 955 }
 956
 957 TSAN_INTERCEPTOR(int, pthread_cond_broadcast, void *c) {
 958   SCOPED_TSAN_INTERCEPTOR(pthread_cond_broadcast, c);
 959   int res = REAL(pthread_cond_broadcast)(c);
 960   return res;
 961 }
 962
 963 TSAN_INTERCEPTOR(int, pthread_cond_wait, void *c, void *m) {
 964   SCOPED_TSAN_INTERCEPTOR(pthread_cond_wait, c, m);
 965   MutexUnlock(thr, pc, (uptr)m);
 966   int res = REAL(pthread_cond_wait)(c, m);
 967   MutexLock(thr, pc, (uptr)m);
 968   return res;
 969 }
 970
 971 TSAN_INTERCEPTOR(int, pthread_cond_timedwait, void *c, void *m, void *abstime) {
 972   SCOPED_TSAN_INTERCEPTOR(pthread_cond_timedwait, c, m, abstime);
 973   MutexUnlock(thr, pc, (uptr)m);
 974   int res = REAL(pthread_cond_timedwait)(c, m, abstime);
 975   MutexLock(thr, pc, (uptr)m);
 976   return res;
 977 }
 978
 979 TSAN_INTERCEPTOR(int, pthread_barrier_init, void *b, void *a, unsigned count) {
 980   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_init, b, a, count);
 981   MemoryWrite1Byte(thr, pc, (uptr)b);
 982   int res = REAL(pthread_barrier_init)(b, a, count);
 983   return res;
 984 }
 985
 986 TSAN_INTERCEPTOR(int, pthread_barrier_destroy, void *b) {
 987   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_destroy, b);
 988   MemoryWrite1Byte(thr, pc, (uptr)b);
 989   int res = REAL(pthread_barrier_destroy)(b);
 990   return res;
 991 }
 992
 993 TSAN_INTERCEPTOR(int, pthread_barrier_wait, void *b) {
 994   SCOPED_TSAN_INTERCEPTOR(pthread_barrier_wait, b);
 995   Release(thr, pc, (uptr)b);
 996   MemoryRead1Byte(thr, pc, (uptr)b);
 997   int res = REAL(pthread_barrier_wait)(b);
 998   MemoryRead1Byte(thr, pc, (uptr)b);
 999   if (res == 0 || res == PTHREAD_BARRIER_SERIAL_THREAD) {
1000     Acquire(thr, pc, (uptr)b);
1001   }
1002   return res;
1003 }
1004
1005 TSAN_INTERCEPTOR(int, pthread_once, void *o, void (*f)()) {
1006   SCOPED_TSAN_INTERCEPTOR(pthread_once, o, f);
1007   if (o == 0 || f == 0)
1008     return EINVAL;
1009   atomic_uint32_t *a = static_cast<atomic_uint32_t*>(o);
1010   u32 v = atomic_load(a, memory_order_acquire);
1011   if (v == 0 && atomic_compare_exchange_strong(a, &v, 1,
1012                                                memory_order_relaxed)) {
1013     const int old_in_rtl = thr->in_rtl;
1014     thr->in_rtl = 0;
1015     (*f)();
1016     CHECK_EQ(thr->in_rtl, 0);
1017     thr->in_rtl = old_in_rtl;
1018     Release(thr, pc, (uptr)o);
1019     atomic_store(a, 2, memory_order_release);
1020   } else {
1021     while (v != 2) {
1022       pthread_yield();
1023       v = atomic_load(a, memory_order_acquire);
1024     }
1025     Acquire(thr, pc, (uptr)o);
1026   }
1027   return 0;
1028 }
1029
1030 TSAN_INTERCEPTOR(int, sem_init, void *s, int pshared, unsigned value) {
1031   SCOPED_TSAN_INTERCEPTOR(sem_init, s, pshared, value);
1032   int res = REAL(sem_init)(s, pshared, value);
1033   return res;
1034 }
1035
1036 TSAN_INTERCEPTOR(int, sem_destroy, void *s) {
1037   SCOPED_TSAN_INTERCEPTOR(sem_destroy, s);
1038   int res = REAL(sem_destroy)(s);
1039   return res;
1040 }
1041
1042 TSAN_INTERCEPTOR(int, sem_wait, void *s) {
1043   SCOPED_TSAN_INTERCEPTOR(sem_wait, s);
1044   int res = BLOCK_REAL(sem_wait)(s);
1045   if (res == 0) {
1046     Acquire(thr, pc, (uptr)s);
1047   }
1048   return res;
1049 }
1050
1051 TSAN_INTERCEPTOR(int, sem_trywait, void *s) {
1052   SCOPED_TSAN_INTERCEPTOR(sem_trywait, s);
1053   int res = BLOCK_REAL(sem_trywait)(s);
1054   if (res == 0) {
1055     Acquire(thr, pc, (uptr)s);
1056   }
1057   return res;
1058 }
1059
1060 TSAN_INTERCEPTOR(int, sem_timedwait, void *s, void *abstime) {
1061   SCOPED_TSAN_INTERCEPTOR(sem_timedwait, s, abstime);
1062   int res = BLOCK_REAL(sem_timedwait)(s, abstime);
1063   if (res == 0) {
1064     Acquire(thr, pc, (uptr)s);
1065   }
1066   return res;
1067 }
1068
1069 TSAN_INTERCEPTOR(int, sem_post, void *s) {
1070   SCOPED_TSAN_INTERCEPTOR(sem_post, s);
1071   Release(thr, pc, (uptr)s);
1072   int res = REAL(sem_post)(s);
1073   return res;
1074 }
1075
1076 TSAN_INTERCEPTOR(int, sem_getvalue, void *s, int *sval) {
1077   SCOPED_TSAN_INTERCEPTOR(sem_getvalue, s, sval);
1078   int res = REAL(sem_getvalue)(s, sval);
1079   if (res == 0) {
1080     Acquire(thr, pc, (uptr)s);
1081   }
1082   return res;
1083 }
1084
1085 TSAN_INTERCEPTOR(long_t, read, int fd, void *buf, long_t sz) {
1086   SCOPED_TSAN_INTERCEPTOR(read, fd, buf, sz);
1087   int res = REAL(read)(fd, buf, sz);
1088   if (res >= 0) {
1089     Acquire(thr, pc, fd2addr(fd));
1090   }
1091   return res;
1092 }
1093
1094 TSAN_INTERCEPTOR(long_t, pread, int fd, void *buf, long_t sz, unsigned off) {
1095   SCOPED_TSAN_INTERCEPTOR(pread, fd, buf, sz, off);
1096   int res = REAL(pread)(fd, buf, sz, off);
1097   if (res >= 0) {
1098     Acquire(thr, pc, fd2addr(fd));
1099   }
1100   return res;
1101 }
1102
1103 TSAN_INTERCEPTOR(long_t, pread64, int fd, void *buf, long_t sz, u64 off) {
1104   SCOPED_TSAN_INTERCEPTOR(pread64, fd, buf, sz, off);
1105   int res = REAL(pread64)(fd, buf, sz, off);
1106   if (res >= 0) {
1107     Acquire(thr, pc, fd2addr(fd));
1108   }
1109   return res;
1110 }
1111
1112 TSAN_INTERCEPTOR(long_t, readv, int fd, void *vec, int cnt) {
1113   SCOPED_TSAN_INTERCEPTOR(readv, fd, vec, cnt);
1114   int res = REAL(readv)(fd, vec, cnt);
1115   if (res >= 0) {
1116     Acquire(thr, pc, fd2addr(fd));
1117   }
1118   return res;
1119 }
1120
1121 TSAN_INTERCEPTOR(long_t, preadv64, int fd, void *vec, int cnt, u64 off) {
1122   SCOPED_TSAN_INTERCEPTOR(preadv64, fd, vec, cnt, off);
1123   int res = REAL(preadv64)(fd, vec, cnt, off);
1124   if (res >= 0) {
1125     Acquire(thr, pc, fd2addr(fd));
1126   }
1127   return res;
1128 }
1129
1130 TSAN_INTERCEPTOR(long_t, write, int fd, void *buf, long_t sz) {
1131   SCOPED_TSAN_INTERCEPTOR(write, fd, buf, sz);
1132   Release(thr, pc, fd2addr(fd));
1133   int res = REAL(write)(fd, buf, sz);
1134   return res;
1135 }
1136
1137 TSAN_INTERCEPTOR(long_t, pwrite, int fd, void *buf, long_t sz, unsigned off) {
1138   SCOPED_TSAN_INTERCEPTOR(pwrite, fd, buf, sz, off);
1139   Release(thr, pc, fd2addr(fd));
1140   int res = REAL(pwrite)(fd, buf, sz, off);
1141   return res;
1142 }
1143
1144 TSAN_INTERCEPTOR(long_t, pwrite64, int fd, void *buf, long_t sz, u64 off) {
1145   SCOPED_TSAN_INTERCEPTOR(pwrite64, fd, buf, sz, off);
1146   Release(thr, pc, fd2addr(fd));
1147   int res = REAL(pwrite64)(fd, buf, sz, off);
1148   return res;
1149 }
1150
1151 TSAN_INTERCEPTOR(long_t, writev, int fd, void *vec, int cnt) {
1152   SCOPED_TSAN_INTERCEPTOR(writev, fd, vec, cnt);
1153   Release(thr, pc, fd2addr(fd));
1154   int res = REAL(writev)(fd, vec, cnt);
1155   return res;
1156 }
1157
1158 TSAN_INTERCEPTOR(long_t, pwritev64, int fd, void *vec, int cnt, u64 off) {
1159   SCOPED_TSAN_INTERCEPTOR(pwritev64, fd, vec, cnt, off);
1160   Release(thr, pc, fd2addr(fd));
1161   int res = REAL(pwritev64)(fd, vec, cnt, off);
1162   return res;
1163 }
1164
1165 TSAN_INTERCEPTOR(long_t, send, int fd, void *buf, long_t len, int flags) {
1166   SCOPED_TSAN_INTERCEPTOR(send, fd, buf, len, flags);
1167   Release(thr, pc, fd2addr(fd));
1168   int res = REAL(send)(fd, buf, len, flags);
1169   return res;
1170 }
1171
1172 TSAN_INTERCEPTOR(long_t, sendmsg, int fd, void *msg, int flags) {
1173   SCOPED_TSAN_INTERCEPTOR(sendmsg, fd, msg, flags);
1174   Release(thr, pc, fd2addr(fd));
1175   int res = REAL(sendmsg)(fd, msg, flags);
1176   return res;
1177 }
1178
1179 TSAN_INTERCEPTOR(long_t, recv, int fd, void *buf, long_t len, int flags) {
1180   SCOPED_TSAN_INTERCEPTOR(recv, fd, buf, len, flags);
1181   int res = REAL(recv)(fd, buf, len, flags);
1182   if (res >= 0) {
1183     Acquire(thr, pc, fd2addr(fd));
1184   }
1185   return res;
1186 }
1187
1188 TSAN_INTERCEPTOR(long_t, recvmsg, int fd, void *msg, int flags) {
1189   SCOPED_TSAN_INTERCEPTOR(recvmsg, fd, msg, flags);
1190   int res = REAL(recvmsg)(fd, msg, flags);
1191   if (res >= 0) {
1192     Acquire(thr, pc, fd2addr(fd));
1193   }
1194   return res;
1195 }
1196
1197 TSAN_INTERCEPTOR(int, unlink, char *path) {
1198   SCOPED_TSAN_INTERCEPTOR(unlink, path);
1199   Release(thr, pc, file2addr(path));
1200   int res = REAL(unlink)(path);
1201   return res;
1202 }
1203
1204 TSAN_INTERCEPTOR(void*, fopen, char *path, char *mode) {
1205   SCOPED_TSAN_INTERCEPTOR(fopen, path, mode);
1206   void *res = REAL(fopen)(path, mode);
1207   Acquire(thr, pc, file2addr(path));
1208   return res;
1209 }
1210
1211 TSAN_INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
1212   SCOPED_TSAN_INTERCEPTOR(fread, ptr, size, nmemb, f);
1213   MemoryAccessRange(thr, pc, (uptr)ptr, size * nmemb, true);
1214   return REAL(fread)(ptr, size, nmemb, f);
1215 }
1216
1217 TSAN_INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
1218   SCOPED_TSAN_INTERCEPTOR(fwrite, p, size, nmemb, f);
1219   MemoryAccessRange(thr, pc, (uptr)p, size * nmemb, false);
1220   return REAL(fwrite)(p, size, nmemb, f);
1221 }
1222
1223 TSAN_INTERCEPTOR(int, puts, const char *s) {
1224   SCOPED_TSAN_INTERCEPTOR(puts, s);
1225   MemoryAccessRange(thr, pc, (uptr)s, internal_strlen(s), false);
1226   return REAL(puts)(s);
1227 }
1228
1229 TSAN_INTERCEPTOR(int, rmdir, char *path) {
1230   SCOPED_TSAN_INTERCEPTOR(rmdir, path);
1231   Release(thr, pc, dir2addr(path));
1232   int res = REAL(rmdir)(path);
1233   return res;
1234 }
1235
1236 TSAN_INTERCEPTOR(void*, opendir, char *path) {
1237   SCOPED_TSAN_INTERCEPTOR(opendir, path);
1238   void *res = REAL(opendir)(path);
1239   Acquire(thr, pc, dir2addr(path));
1240   return res;
1241 }
1242
1243 TSAN_INTERCEPTOR(int, epoll_ctl, int epfd, int op, int fd, void *ev) {
1244   SCOPED_TSAN_INTERCEPTOR(epoll_ctl, epfd, op, fd, ev);
1245   if (op == EPOLL_CTL_ADD) {
1246     Release(thr, pc, epollfd2addr(epfd));
1247   }
1248   int res = REAL(epoll_ctl)(epfd, op, fd, ev);
1249   return res;
1250 }
1251
1252 TSAN_INTERCEPTOR(int, epoll_wait, int epfd, void *ev, int cnt, int timeout) {
1253   SCOPED_TSAN_INTERCEPTOR(epoll_wait, epfd, ev, cnt, timeout);
1254   int res = BLOCK_REAL(epoll_wait)(epfd, ev, cnt, timeout);
1255   if (res > 0) {
1256     Acquire(thr, pc, epollfd2addr(epfd));
1257   }
1258   return res;
1259 }
1260
1261 TSAN_INTERCEPTOR(int, poll, void *fds, long_t nfds, int timeout) {
1262   SCOPED_TSAN_INTERCEPTOR(poll, fds, nfds, timeout);
1263   int res = BLOCK_REAL(poll)(fds, nfds, timeout);
1264   return res;
1265 }
1266
1267 static void ALWAYS_INLINE rtl_generic_sighandler(bool sigact, int sig,
1268     my_siginfo_t *info, void *ctx) {
1269   ThreadState *thr = cur_thread();
1270   SignalContext *sctx = SigCtx(thr);
1271   // Don't mess with synchronous signals.
1272   if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
1273       sig == SIGABRT || sig == SIGFPE || sig == SIGPIPE ||
1274       // If we are sending signal to ourselves, we must process it now.
1275       (sctx && sig == sctx->int_signal_send) ||
1276       // If we are in blocking function, we can safely process it now
1277       // (but check if we are in a recursive interceptor,
1278       // i.e. pthread_join()->munmap()).
1279       (sctx && sctx->in_blocking_func == 1 && thr->in_rtl == 1)) {
1280     CHECK(thr->in_rtl == 0 || thr->in_rtl == 1);
1281     int in_rtl = thr->in_rtl;
1282     thr->in_rtl = 0;
1283     CHECK_EQ(thr->in_signal_handler, false);
1284     thr->in_signal_handler = true;
1285     if (sigact)
1286       sigactions[sig].sa_sigaction(sig, info, ctx);
1287     else
1288       sigactions[sig].sa_handler(sig);
1289     CHECK_EQ(thr->in_signal_handler, true);
1290     thr->in_signal_handler = false;
1291     thr->in_rtl = in_rtl;
1292     return;
1293   }
1294
1295   if (sctx == 0)
1296     return;
1297   SignalDesc *signal = &sctx->pending_signals[sig];
1298   if (signal->armed == false) {
1299     signal->armed = true;
1300     signal->sigaction = sigact;
1301     if (info)
1302       internal_memcpy(&signal->siginfo, info, sizeof(*info));
1303     if (ctx)
1304       internal_memcpy(&signal->ctx, ctx, sizeof(signal->ctx));
1305     sctx->pending_signal_count++;
1306   }
1307 }
1308
1309 static void rtl_sighandler(int sig) {
1310   rtl_generic_sighandler(false, sig, 0, 0);
1311 }
1312
1313 static void rtl_sigaction(int sig, my_siginfo_t *info, void *ctx) {
1314   rtl_generic_sighandler(true, sig, info, ctx);
1315 }
1316
1317 TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
1318   SCOPED_TSAN_INTERCEPTOR(sigaction, sig, act, old);
1319   if (old)
1320     internal_memcpy(old, &sigactions[sig], sizeof(*old));
1321   if (act == 0)
1322     return 0;
1323   internal_memcpy(&sigactions[sig], act, sizeof(*act));
1324   sigaction_t newact;
1325   internal_memcpy(&newact, act, sizeof(newact));
1326   sigfillset(&newact.sa_mask);
1327   if (act->sa_handler != SIG_IGN && act->sa_handler != SIG_DFL) {
1328     if (newact.sa_flags & SA_SIGINFO)
1329       newact.sa_sigaction = rtl_sigaction;
1330     else
1331       newact.sa_handler = rtl_sighandler;
1332   }
1333   int res = REAL(sigaction)(sig, &newact, 0);
1334   return res;
1335 }
1336
1337 TSAN_INTERCEPTOR(sighandler_t, signal, int sig, sighandler_t h) {
1338   sigaction_t act;
1339   act.sa_handler = h;
1340   REAL(memset)(&act.sa_mask, -1, sizeof(act.sa_mask));
1341   act.sa_flags = 0;
1342   sigaction_t old;
1343   int res = sigaction(sig, &act, &old);
1344   if (res)
1345     return SIG_ERR;
1346   return old.sa_handler;
1347 }
1348
1349 TSAN_INTERCEPTOR(int, raise, int sig) {
1350   SCOPED_TSAN_INTERCEPTOR(raise, sig);
1351   SignalContext *sctx = SigCtx(thr);
1352   CHECK_NE(sctx, 0);
1353   int prev = sctx->int_signal_send;
1354   sctx->int_signal_send = sig;
1355   int res = REAL(raise)(sig);
1356   CHECK_EQ(sctx->int_signal_send, sig);
1357   sctx->int_signal_send = prev;
1358   return res;
1359 }
1360
1361 TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
1362   SCOPED_TSAN_INTERCEPTOR(kill, pid, sig);
1363   SignalContext *sctx = SigCtx(thr);
1364   CHECK_NE(sctx, 0);
1365   int prev = sctx->int_signal_send;
1366   if (pid == GetPid()) {
1367     sctx->int_signal_send = sig;
1368   }
1369   int res = REAL(kill)(pid, sig);
1370   if (pid == GetPid()) {
1371     CHECK_EQ(sctx->int_signal_send, sig);
1372     sctx->int_signal_send = prev;
1373   }
1374   return res;
1375 }
1376
1377 TSAN_INTERCEPTOR(int, pthread_kill, void *tid, int sig) {
1378   SCOPED_TSAN_INTERCEPTOR(pthread_kill, tid, sig);
1379   SignalContext *sctx = SigCtx(thr);
1380   CHECK_NE(sctx, 0);
1381   int prev = sctx->int_signal_send;
1382   if (tid == pthread_self()) {
1383     sctx->int_signal_send = sig;
1384   }
1385   int res = REAL(pthread_kill)(tid, sig);
1386   if (tid == pthread_self()) {
1387     CHECK_EQ(sctx->int_signal_send, sig);
1388     sctx->int_signal_send = prev;
1389   }
1390   return res;
1391 }
1392
1393 TSAN_INTERCEPTOR(int, gettimeofday, void *tv, void *tz) {
1394   SCOPED_TSAN_INTERCEPTOR(gettimeofday, tv, tz);
1395   // It's intercepted merely to process pending signals.
1396   return REAL(gettimeofday)(tv, tz);
1397 }
1398
1399 // Linux kernel has a bug that leads to kernel deadlock if a process
1400 // maps TBs of memory and then calls mlock().
1401 static void MlockIsUnsupported() {
1402   static atomic_uint8_t printed;
1403   if (atomic_exchange(&printed, 1, memory_order_relaxed))
1404     return;
1405   Printf("INFO: ThreadSanitizer ignores mlock/mlockall/munlock/munlockall\n");
1406 }
1407
1408 TSAN_INTERCEPTOR(int, mlock, const void *addr, uptr len) {
1409   MlockIsUnsupported();
1410   return 0;
1411 }
1412
1413 TSAN_INTERCEPTOR(int, munlock, const void *addr, uptr len) {
1414   MlockIsUnsupported();
1415   return 0;
1416 }
1417
1418 TSAN_INTERCEPTOR(int, mlockall, int flags) {
1419   MlockIsUnsupported();
1420   return 0;
1421 }
1422
1423 TSAN_INTERCEPTOR(int, munlockall, void) {
1424   MlockIsUnsupported();
1425   return 0;
1426 }
1427
1428 namespace __tsan {
1429
1430 void ProcessPendingSignals(ThreadState *thr) {
1431   CHECK_EQ(thr->in_rtl, 0);
1432   SignalContext *sctx = SigCtx(thr);
1433   if (sctx == 0 || sctx->pending_signal_count == 0 || thr->in_signal_handler)
1434     return;
1435   Context *ctx = CTX();
1436   thr->in_signal_handler = true;
1437   sctx->pending_signal_count = 0;
1438   // These are too big for stack.
1439   static THREADLOCAL sigset_t emptyset, oldset;
1440   sigfillset(&emptyset);
1441   pthread_sigmask(SIG_SETMASK, &emptyset, &oldset);
1442   for (int sig = 0; sig < kSigCount; sig++) {
1443     SignalDesc *signal = &sctx->pending_signals[sig];
1444     if (signal->armed) {
1445       signal->armed = false;
1446       if (sigactions[sig].sa_handler != SIG_DFL
1447           && sigactions[sig].sa_handler != SIG_IGN) {
1448         // Insure that the handler does not spoil errno.
1449         const int saved_errno = errno;
1450         errno = 0;
1451         if (signal->sigaction)
1452           sigactions[sig].sa_sigaction(sig, &signal->siginfo, &signal->ctx);
1453         else
1454           sigactions[sig].sa_handler(sig);
1455         if (flags()->report_bugs && errno != 0) {
1456           ScopedInRtl in_rtl;
1457           __tsan::StackTrace stack;
1458           uptr pc = signal->sigaction ?
1459               (uptr)sigactions[sig].sa_sigaction :
1460               (uptr)sigactions[sig].sa_handler;
1461           stack.Init(&pc, 1);
1462           ScopedReport rep(ReportTypeErrnoInSignal);
1463           if (!IsFiredSuppression(ctx, rep, stack)) {
1464             rep.AddStack(&stack);
1465             OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
1466           }
1467         }
1468         errno = saved_errno;
1469       }
1470     }
1471   }
1472   pthread_sigmask(SIG_SETMASK, &oldset, 0);
1473   CHECK_EQ(thr->in_signal_handler, true);
1474   thr->in_signal_handler = false;
1475 }
1476
1477 static void unreachable() {
1478   Printf("FATAL: ThreadSanitizer: unreachable called\n");
1479   Die();
1480 }
1481
1482 void InitializeInterceptors() {
1483   CHECK_GT(cur_thread()->in_rtl, 0);
1484
1485   // We need to setup it early, because functions like dlsym() can call it.
1486   REAL(memset) = internal_memset;
1487   REAL(memcpy) = internal_memcpy;
1488   REAL(memcmp) = internal_memcmp;
1489
1490   TSAN_INTERCEPT(longjmp);
1491   TSAN_INTERCEPT(siglongjmp);
1492
1493   TSAN_INTERCEPT(malloc);
1494   TSAN_INTERCEPT(__libc_memalign);
1495   TSAN_INTERCEPT(calloc);
1496   TSAN_INTERCEPT(realloc);
1497   TSAN_INTERCEPT(free);
1498   TSAN_INTERCEPT(cfree);
1499   TSAN_INTERCEPT(mmap);
1500   TSAN_INTERCEPT(mmap64);
1501   TSAN_INTERCEPT(munmap);
1502   TSAN_INTERCEPT(memalign);
1503   TSAN_INTERCEPT(valloc);
1504   TSAN_INTERCEPT(pvalloc);
1505   TSAN_INTERCEPT(posix_memalign);
1506
1507   TSAN_INTERCEPT(strlen);
1508   TSAN_INTERCEPT(memset);
1509   TSAN_INTERCEPT(memcpy);
1510   TSAN_INTERCEPT(strcmp);
1511   TSAN_INTERCEPT(memchr);
1512   TSAN_INTERCEPT(memrchr);
1513   TSAN_INTERCEPT(memmove);
1514   TSAN_INTERCEPT(memcmp);
1515   TSAN_INTERCEPT(strchr);
1516   TSAN_INTERCEPT(strchrnul);
1517   TSAN_INTERCEPT(strrchr);
1518   TSAN_INTERCEPT(strncmp);
1519   TSAN_INTERCEPT(strcpy);  // NOLINT
1520   TSAN_INTERCEPT(strncpy);
1521   TSAN_INTERCEPT(strstr);
1522
1523   TSAN_INTERCEPT(pthread_create);
1524   TSAN_INTERCEPT(pthread_join);
1525   TSAN_INTERCEPT(pthread_detach);
1526
1527   TSAN_INTERCEPT(pthread_mutex_init);
1528   TSAN_INTERCEPT(pthread_mutex_destroy);
1529   TSAN_INTERCEPT(pthread_mutex_lock);
1530   TSAN_INTERCEPT(pthread_mutex_trylock);
1531   TSAN_INTERCEPT(pthread_mutex_timedlock);
1532   TSAN_INTERCEPT(pthread_mutex_unlock);
1533
1534   TSAN_INTERCEPT(pthread_spin_init);
1535   TSAN_INTERCEPT(pthread_spin_destroy);
1536   TSAN_INTERCEPT(pthread_spin_lock);
1537   TSAN_INTERCEPT(pthread_spin_trylock);
1538   TSAN_INTERCEPT(pthread_spin_unlock);
1539
1540   TSAN_INTERCEPT(pthread_rwlock_init);
1541   TSAN_INTERCEPT(pthread_rwlock_destroy);
1542   TSAN_INTERCEPT(pthread_rwlock_rdlock);
1543   TSAN_INTERCEPT(pthread_rwlock_tryrdlock);
1544   TSAN_INTERCEPT(pthread_rwlock_timedrdlock);
1545   TSAN_INTERCEPT(pthread_rwlock_wrlock);
1546   TSAN_INTERCEPT(pthread_rwlock_trywrlock);
1547   TSAN_INTERCEPT(pthread_rwlock_timedwrlock);
1548   TSAN_INTERCEPT(pthread_rwlock_unlock);
1549
1550   TSAN_INTERCEPT(pthread_cond_init);
1551   TSAN_INTERCEPT(pthread_cond_destroy);
1552   TSAN_INTERCEPT(pthread_cond_signal);
1553   TSAN_INTERCEPT(pthread_cond_broadcast);
1554   TSAN_INTERCEPT(pthread_cond_wait);
1555   TSAN_INTERCEPT(pthread_cond_timedwait);
1556
1557   TSAN_INTERCEPT(pthread_barrier_init);
1558   TSAN_INTERCEPT(pthread_barrier_destroy);
1559   TSAN_INTERCEPT(pthread_barrier_wait);
1560
1561   TSAN_INTERCEPT(pthread_once);
1562
1563   TSAN_INTERCEPT(sem_init);
1564   TSAN_INTERCEPT(sem_destroy);
1565   TSAN_INTERCEPT(sem_wait);
1566   TSAN_INTERCEPT(sem_trywait);
1567   TSAN_INTERCEPT(sem_timedwait);
1568   TSAN_INTERCEPT(sem_post);
1569   TSAN_INTERCEPT(sem_getvalue);
1570
1571   TSAN_INTERCEPT(read);
1572   TSAN_INTERCEPT(pread);
1573   TSAN_INTERCEPT(pread64);
1574   TSAN_INTERCEPT(readv);
1575   TSAN_INTERCEPT(preadv64);
1576   TSAN_INTERCEPT(write);
1577   TSAN_INTERCEPT(pwrite);
1578   TSAN_INTERCEPT(pwrite64);
1579   TSAN_INTERCEPT(writev);
1580   TSAN_INTERCEPT(pwritev64);
1581   TSAN_INTERCEPT(send);
1582   TSAN_INTERCEPT(sendmsg);
1583   TSAN_INTERCEPT(recv);
1584   TSAN_INTERCEPT(recvmsg);
1585
1586   TSAN_INTERCEPT(unlink);
1587   TSAN_INTERCEPT(fopen);
1588   TSAN_INTERCEPT(fread);
1589   TSAN_INTERCEPT(fwrite);
1590   TSAN_INTERCEPT(puts);
1591   TSAN_INTERCEPT(rmdir);
1592   TSAN_INTERCEPT(opendir);
1593
1594   TSAN_INTERCEPT(epoll_ctl);
1595   TSAN_INTERCEPT(epoll_wait);
1596   TSAN_INTERCEPT(poll);
1597
1598   TSAN_INTERCEPT(sigaction);
1599   TSAN_INTERCEPT(signal);
1600   TSAN_INTERCEPT(raise);
1601   TSAN_INTERCEPT(kill);
1602   TSAN_INTERCEPT(pthread_kill);
1603   TSAN_INTERCEPT(sleep);
1604   TSAN_INTERCEPT(usleep);
1605   TSAN_INTERCEPT(nanosleep);
1606   TSAN_INTERCEPT(gettimeofday);
1607
1608   TSAN_INTERCEPT(mlock);
1609   TSAN_INTERCEPT(munlock);
1610   TSAN_INTERCEPT(mlockall);
1611   TSAN_INTERCEPT(munlockall);
1612
1613   // Need to setup it, because interceptors check that the function is resolved.
1614   // But atexit is emitted directly into the module, so can't be resolved.
1615   REAL(atexit) = (int(*)(void(*)()))unreachable;
1616   atexit_ctx = new(internal_alloc(MBlockAtExit, sizeof(AtExitContext)))
1617       AtExitContext();
1618
1619   if (__cxa_atexit(&finalize, 0, 0)) {
1620     Printf("ThreadSanitizer: failed to setup atexit callback\n");
1621     Die();
1622   }
1623
1624   if (pthread_key_create(&g_thread_finalize_key, &thread_finalize)) {
1625     Printf("ThreadSanitizer: failed to create thread key\n");
1626     Die();
1627   }
1628 }
1629
1630 void internal_start_thread(void(*func)(void *arg), void *arg) {
1631   void *th;
1632   REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
1633   REAL(pthread_detach)(th);
1634 }
1635
1636 }  // namespace __tsan