ThreadSanitizer.cpp revision f464481db0c3b5404004b510921ca454803fd1d0
1//===-- ThreadSanitizer.cpp - race detector -------------------------------===// 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, a race detector. 11// 12// The tool is under development, for the details about previous versions see 13// http://code.google.com/p/data-race-test 14// 15// The instrumentation phase is quite simple: 16// - Insert calls to run-time library before every memory access. 17// - Optimizations may apply to avoid instrumenting some of the accesses. 18// - Insert calls at function entry/exit. 19// The rest is handled by the run-time library. 20//===----------------------------------------------------------------------===// 21 22#define DEBUG_TYPE "tsan" 23 24#include "llvm/Transforms/Instrumentation.h" 25#include "llvm/ADT/SmallSet.h" 26#include "llvm/ADT/SmallString.h" 27#include "llvm/ADT/SmallVector.h" 28#include "llvm/ADT/Statistic.h" 29#include "llvm/ADT/StringExtras.h" 30#include "llvm/IR/DataLayout.h" 31#include "llvm/IR/Function.h" 32#include "llvm/IR/IRBuilder.h" 33#include "llvm/IR/IntrinsicInst.h" 34#include "llvm/IR/Intrinsics.h" 35#include "llvm/IR/LLVMContext.h" 36#include "llvm/IR/Metadata.h" 37#include "llvm/IR/Module.h" 38#include "llvm/IR/Type.h" 39#include "llvm/Support/CommandLine.h" 40#include "llvm/Support/Debug.h" 41#include "llvm/Support/MathExtras.h" 42#include "llvm/Support/raw_ostream.h" 43#include "llvm/Transforms/Utils/BasicBlockUtils.h" 44#include "llvm/Transforms/Utils/BlackList.h" 45#include "llvm/Transforms/Utils/ModuleUtils.h" 46 47using namespace llvm; 48 49static cl::opt<std::string> ClBlacklistFile("tsan-blacklist", 50 cl::desc("Blacklist file"), cl::Hidden); 51static cl::opt<bool> ClInstrumentMemoryAccesses( 52 "tsan-instrument-memory-accesses", cl::init(true), 53 cl::desc("Instrument memory accesses"), cl::Hidden); 54static cl::opt<bool> ClInstrumentFuncEntryExit( 55 "tsan-instrument-func-entry-exit", cl::init(true), 56 cl::desc("Instrument function entry and exit"), cl::Hidden); 57static cl::opt<bool> ClInstrumentAtomics( 58 "tsan-instrument-atomics", cl::init(true), 59 cl::desc("Instrument atomics"), cl::Hidden); 60static cl::opt<bool> ClInstrumentMemIntrinsics( 61 "tsan-instrument-memintrinsics", cl::init(true), 62 cl::desc("Instrument memintrinsics (memset/memcpy/memmove)"), cl::Hidden); 63 64STATISTIC(NumInstrumentedReads, "Number of instrumented reads"); 65STATISTIC(NumInstrumentedWrites, "Number of instrumented writes"); 66STATISTIC(NumOmittedReadsBeforeWrite, 67 "Number of reads ignored due to following writes"); 68STATISTIC(NumAccessesWithBadSize, "Number of accesses with bad size"); 69STATISTIC(NumInstrumentedVtableWrites, "Number of vtable ptr writes"); 70STATISTIC(NumInstrumentedVtableReads, "Number of vtable ptr reads"); 71STATISTIC(NumOmittedReadsFromConstantGlobals, 72 "Number of reads from constant globals"); 73STATISTIC(NumOmittedReadsFromVtable, "Number of vtable reads"); 74 75namespace { 76 77/// ThreadSanitizer: instrument the code in module to find races. 78struct ThreadSanitizer : public FunctionPass { 79 ThreadSanitizer(StringRef BlacklistFile = StringRef()) 80 : FunctionPass(ID), 81 TD(0), 82 BlacklistFile(BlacklistFile.empty() ? ClBlacklistFile 83 : BlacklistFile) { } 84 const char *getPassName() const; 85 bool runOnFunction(Function &F); 86 bool doInitialization(Module &M); 87 static char ID; // Pass identification, replacement for typeid. 88 89 private: 90 void initializeCallbacks(Module &M); 91 bool instrumentLoadOrStore(Instruction *I); 92 bool instrumentAtomic(Instruction *I); 93 bool instrumentMemIntrinsic(Instruction *I); 94 void chooseInstructionsToInstrument(SmallVectorImpl<Instruction*> &Local, 95 SmallVectorImpl<Instruction*> &All); 96 bool addrPointsToConstantData(Value *Addr); 97 int getMemoryAccessFuncIndex(Value *Addr); 98 99 DataLayout *TD; 100 Type *IntptrTy; 101 SmallString<64> BlacklistFile; 102 OwningPtr<BlackList> BL; 103 IntegerType *OrdTy; 104 // Callbacks to run-time library are computed in doInitialization. 105 Function *TsanFuncEntry; 106 Function *TsanFuncExit; 107 // Accesses sizes are powers of two: 1, 2, 4, 8, 16. 108 static const size_t kNumberOfAccessSizes = 5; 109 Function *TsanRead[kNumberOfAccessSizes]; 110 Function *TsanWrite[kNumberOfAccessSizes]; 111 Function *TsanAtomicLoad[kNumberOfAccessSizes]; 112 Function *TsanAtomicStore[kNumberOfAccessSizes]; 113 Function *TsanAtomicRMW[AtomicRMWInst::LAST_BINOP + 1][kNumberOfAccessSizes]; 114 Function *TsanAtomicCAS[kNumberOfAccessSizes]; 115 Function *TsanAtomicThreadFence; 116 Function *TsanAtomicSignalFence; 117 Function *TsanVptrUpdate; 118 Function *TsanVptrLoad; 119 Function *MemmoveFn, *MemcpyFn, *MemsetFn; 120}; 121} // namespace 122 123char ThreadSanitizer::ID = 0; 124INITIALIZE_PASS(ThreadSanitizer, "tsan", 125 "ThreadSanitizer: detects data races.", 126 false, false) 127 128const char *ThreadSanitizer::getPassName() const { 129 return "ThreadSanitizer"; 130} 131 132FunctionPass *llvm::createThreadSanitizerPass(StringRef BlacklistFile) { 133 return new ThreadSanitizer(BlacklistFile); 134} 135 136static Function *checkInterfaceFunction(Constant *FuncOrBitcast) { 137 if (Function *F = dyn_cast<Function>(FuncOrBitcast)) 138 return F; 139 FuncOrBitcast->dump(); 140 report_fatal_error("ThreadSanitizer interface function redefined"); 141} 142 143void ThreadSanitizer::initializeCallbacks(Module &M) { 144 IRBuilder<> IRB(M.getContext()); 145 // Initialize the callbacks. 146 TsanFuncEntry = checkInterfaceFunction(M.getOrInsertFunction( 147 "__tsan_func_entry", IRB.getVoidTy(), IRB.getInt8PtrTy(), NULL)); 148 TsanFuncExit = checkInterfaceFunction(M.getOrInsertFunction( 149 "__tsan_func_exit", IRB.getVoidTy(), NULL)); 150 OrdTy = IRB.getInt32Ty(); 151 for (size_t i = 0; i < kNumberOfAccessSizes; ++i) { 152 const size_t ByteSize = 1 << i; 153 const size_t BitSize = ByteSize * 8; 154 SmallString<32> ReadName("__tsan_read" + itostr(ByteSize)); 155 TsanRead[i] = checkInterfaceFunction(M.getOrInsertFunction( 156 ReadName, IRB.getVoidTy(), IRB.getInt8PtrTy(), NULL)); 157 158 SmallString<32> WriteName("__tsan_write" + itostr(ByteSize)); 159 TsanWrite[i] = checkInterfaceFunction(M.getOrInsertFunction( 160 WriteName, IRB.getVoidTy(), IRB.getInt8PtrTy(), NULL)); 161 162 Type *Ty = Type::getIntNTy(M.getContext(), BitSize); 163 Type *PtrTy = Ty->getPointerTo(); 164 SmallString<32> AtomicLoadName("__tsan_atomic" + itostr(BitSize) + 165 "_load"); 166 TsanAtomicLoad[i] = checkInterfaceFunction(M.getOrInsertFunction( 167 AtomicLoadName, Ty, PtrTy, OrdTy, NULL)); 168 169 SmallString<32> AtomicStoreName("__tsan_atomic" + itostr(BitSize) + 170 "_store"); 171 TsanAtomicStore[i] = checkInterfaceFunction(M.getOrInsertFunction( 172 AtomicStoreName, IRB.getVoidTy(), PtrTy, Ty, OrdTy, 173 NULL)); 174 175 for (int op = AtomicRMWInst::FIRST_BINOP; 176 op <= AtomicRMWInst::LAST_BINOP; ++op) { 177 TsanAtomicRMW[op][i] = NULL; 178 const char *NamePart = NULL; 179 if (op == AtomicRMWInst::Xchg) 180 NamePart = "_exchange"; 181 else if (op == AtomicRMWInst::Add) 182 NamePart = "_fetch_add"; 183 else if (op == AtomicRMWInst::Sub) 184 NamePart = "_fetch_sub"; 185 else if (op == AtomicRMWInst::And) 186 NamePart = "_fetch_and"; 187 else if (op == AtomicRMWInst::Or) 188 NamePart = "_fetch_or"; 189 else if (op == AtomicRMWInst::Xor) 190 NamePart = "_fetch_xor"; 191 else if (op == AtomicRMWInst::Nand) 192 NamePart = "_fetch_nand"; 193 else 194 continue; 195 SmallString<32> RMWName("__tsan_atomic" + itostr(BitSize) + NamePart); 196 TsanAtomicRMW[op][i] = checkInterfaceFunction(M.getOrInsertFunction( 197 RMWName, Ty, PtrTy, Ty, OrdTy, NULL)); 198 } 199 200 SmallString<32> AtomicCASName("__tsan_atomic" + itostr(BitSize) + 201 "_compare_exchange_val"); 202 TsanAtomicCAS[i] = checkInterfaceFunction(M.getOrInsertFunction( 203 AtomicCASName, Ty, PtrTy, Ty, Ty, OrdTy, OrdTy, NULL)); 204 } 205 TsanVptrUpdate = checkInterfaceFunction(M.getOrInsertFunction( 206 "__tsan_vptr_update", IRB.getVoidTy(), IRB.getInt8PtrTy(), 207 IRB.getInt8PtrTy(), NULL)); 208 TsanVptrLoad = checkInterfaceFunction(M.getOrInsertFunction( 209 "__tsan_vptr_read", IRB.getVoidTy(), IRB.getInt8PtrTy(), NULL)); 210 TsanAtomicThreadFence = checkInterfaceFunction(M.getOrInsertFunction( 211 "__tsan_atomic_thread_fence", IRB.getVoidTy(), OrdTy, NULL)); 212 TsanAtomicSignalFence = checkInterfaceFunction(M.getOrInsertFunction( 213 "__tsan_atomic_signal_fence", IRB.getVoidTy(), OrdTy, NULL)); 214 215 MemmoveFn = checkInterfaceFunction(M.getOrInsertFunction( 216 "memmove", IRB.getInt8PtrTy(), IRB.getInt8PtrTy(), 217 IRB.getInt8PtrTy(), IntptrTy, NULL)); 218 MemcpyFn = checkInterfaceFunction(M.getOrInsertFunction( 219 "memcpy", IRB.getInt8PtrTy(), IRB.getInt8PtrTy(), IRB.getInt8PtrTy(), 220 IntptrTy, NULL)); 221 MemsetFn = checkInterfaceFunction(M.getOrInsertFunction( 222 "memset", IRB.getInt8PtrTy(), IRB.getInt8PtrTy(), IRB.getInt32Ty(), 223 IntptrTy, NULL)); 224} 225 226bool ThreadSanitizer::doInitialization(Module &M) { 227 TD = getAnalysisIfAvailable<DataLayout>(); 228 if (!TD) 229 return false; 230 BL.reset(new BlackList(BlacklistFile)); 231 232 // Always insert a call to __tsan_init into the module's CTORs. 233 IRBuilder<> IRB(M.getContext()); 234 IntptrTy = IRB.getIntPtrTy(TD); 235 Value *TsanInit = M.getOrInsertFunction("__tsan_init", 236 IRB.getVoidTy(), NULL); 237 appendToGlobalCtors(M, cast<Function>(TsanInit), 0); 238 239 return true; 240} 241 242static bool isVtableAccess(Instruction *I) { 243 if (MDNode *Tag = I->getMetadata(LLVMContext::MD_tbaa)) { 244 if (Tag->getNumOperands() < 1) return false; 245 if (MDString *Tag1 = dyn_cast<MDString>(Tag->getOperand(0))) { 246 if (Tag1->getString() == "vtable pointer") return true; 247 } 248 } 249 return false; 250} 251 252bool ThreadSanitizer::addrPointsToConstantData(Value *Addr) { 253 // If this is a GEP, just analyze its pointer operand. 254 if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Addr)) 255 Addr = GEP->getPointerOperand(); 256 257 if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Addr)) { 258 if (GV->isConstant()) { 259 // Reads from constant globals can not race with any writes. 260 NumOmittedReadsFromConstantGlobals++; 261 return true; 262 } 263 } else if (LoadInst *L = dyn_cast<LoadInst>(Addr)) { 264 if (isVtableAccess(L)) { 265 // Reads from a vtable pointer can not race with any writes. 266 NumOmittedReadsFromVtable++; 267 return true; 268 } 269 } 270 return false; 271} 272 273// Instrumenting some of the accesses may be proven redundant. 274// Currently handled: 275// - read-before-write (within same BB, no calls between) 276// 277// We do not handle some of the patterns that should not survive 278// after the classic compiler optimizations. 279// E.g. two reads from the same temp should be eliminated by CSE, 280// two writes should be eliminated by DSE, etc. 281// 282// 'Local' is a vector of insns within the same BB (no calls between). 283// 'All' is a vector of insns that will be instrumented. 284void ThreadSanitizer::chooseInstructionsToInstrument( 285 SmallVectorImpl<Instruction*> &Local, 286 SmallVectorImpl<Instruction*> &All) { 287 SmallSet<Value*, 8> WriteTargets; 288 // Iterate from the end. 289 for (SmallVectorImpl<Instruction*>::reverse_iterator It = Local.rbegin(), 290 E = Local.rend(); It != E; ++It) { 291 Instruction *I = *It; 292 if (StoreInst *Store = dyn_cast<StoreInst>(I)) { 293 WriteTargets.insert(Store->getPointerOperand()); 294 } else { 295 LoadInst *Load = cast<LoadInst>(I); 296 Value *Addr = Load->getPointerOperand(); 297 if (WriteTargets.count(Addr)) { 298 // We will write to this temp, so no reason to analyze the read. 299 NumOmittedReadsBeforeWrite++; 300 continue; 301 } 302 if (addrPointsToConstantData(Addr)) { 303 // Addr points to some constant data -- it can not race with any writes. 304 continue; 305 } 306 } 307 All.push_back(I); 308 } 309 Local.clear(); 310} 311 312static bool isAtomic(Instruction *I) { 313 if (LoadInst *LI = dyn_cast<LoadInst>(I)) 314 return LI->isAtomic() && LI->getSynchScope() == CrossThread; 315 if (StoreInst *SI = dyn_cast<StoreInst>(I)) 316 return SI->isAtomic() && SI->getSynchScope() == CrossThread; 317 if (isa<AtomicRMWInst>(I)) 318 return true; 319 if (isa<AtomicCmpXchgInst>(I)) 320 return true; 321 if (isa<FenceInst>(I)) 322 return true; 323 return false; 324} 325 326bool ThreadSanitizer::runOnFunction(Function &F) { 327 if (!TD) return false; 328 if (BL->isIn(F)) return false; 329 initializeCallbacks(*F.getParent()); 330 SmallVector<Instruction*, 8> RetVec; 331 SmallVector<Instruction*, 8> AllLoadsAndStores; 332 SmallVector<Instruction*, 8> LocalLoadsAndStores; 333 SmallVector<Instruction*, 8> AtomicAccesses; 334 SmallVector<Instruction*, 8> MemIntrinCalls; 335 bool Res = false; 336 bool HasCalls = false; 337 338 // Traverse all instructions, collect loads/stores/returns, check for calls. 339 for (Function::iterator FI = F.begin(), FE = F.end(); 340 FI != FE; ++FI) { 341 BasicBlock &BB = *FI; 342 for (BasicBlock::iterator BI = BB.begin(), BE = BB.end(); 343 BI != BE; ++BI) { 344 if (isAtomic(BI)) 345 AtomicAccesses.push_back(BI); 346 else if (isa<LoadInst>(BI) || isa<StoreInst>(BI)) 347 LocalLoadsAndStores.push_back(BI); 348 else if (isa<ReturnInst>(BI)) 349 RetVec.push_back(BI); 350 else if (isa<CallInst>(BI) || isa<InvokeInst>(BI)) { 351 if (isa<MemIntrinsic>(BI)) 352 MemIntrinCalls.push_back(BI); 353 HasCalls = true; 354 chooseInstructionsToInstrument(LocalLoadsAndStores, AllLoadsAndStores); 355 } 356 } 357 chooseInstructionsToInstrument(LocalLoadsAndStores, AllLoadsAndStores); 358 } 359 360 // We have collected all loads and stores. 361 // FIXME: many of these accesses do not need to be checked for races 362 // (e.g. variables that do not escape, etc). 363 364 // Instrument memory accesses. 365 if (ClInstrumentMemoryAccesses) 366 for (size_t i = 0, n = AllLoadsAndStores.size(); i < n; ++i) { 367 Res |= instrumentLoadOrStore(AllLoadsAndStores[i]); 368 } 369 370 // Instrument atomic memory accesses. 371 if (ClInstrumentAtomics) 372 for (size_t i = 0, n = AtomicAccesses.size(); i < n; ++i) { 373 Res |= instrumentAtomic(AtomicAccesses[i]); 374 } 375 376 if (ClInstrumentMemIntrinsics) 377 for (size_t i = 0, n = MemIntrinCalls.size(); i < n; ++i) { 378 Res |= instrumentMemIntrinsic(MemIntrinCalls[i]); 379 } 380 381 // Instrument function entry/exit points if there were instrumented accesses. 382 if ((Res || HasCalls) && ClInstrumentFuncEntryExit) { 383 IRBuilder<> IRB(F.getEntryBlock().getFirstNonPHI()); 384 Value *ReturnAddress = IRB.CreateCall( 385 Intrinsic::getDeclaration(F.getParent(), Intrinsic::returnaddress), 386 IRB.getInt32(0)); 387 IRB.CreateCall(TsanFuncEntry, ReturnAddress); 388 for (size_t i = 0, n = RetVec.size(); i < n; ++i) { 389 IRBuilder<> IRBRet(RetVec[i]); 390 IRBRet.CreateCall(TsanFuncExit); 391 } 392 Res = true; 393 } 394 return Res; 395} 396 397bool ThreadSanitizer::instrumentLoadOrStore(Instruction *I) { 398 IRBuilder<> IRB(I); 399 bool IsWrite = isa<StoreInst>(*I); 400 Value *Addr = IsWrite 401 ? cast<StoreInst>(I)->getPointerOperand() 402 : cast<LoadInst>(I)->getPointerOperand(); 403 int Idx = getMemoryAccessFuncIndex(Addr); 404 if (Idx < 0) 405 return false; 406 if (IsWrite && isVtableAccess(I)) { 407 DEBUG(dbgs() << " VPTR : " << *I << "\n"); 408 Value *StoredValue = cast<StoreInst>(I)->getValueOperand(); 409 // StoredValue does not necessary have a pointer type. 410 if (isa<IntegerType>(StoredValue->getType())) 411 StoredValue = IRB.CreateIntToPtr(StoredValue, IRB.getInt8PtrTy()); 412 // Call TsanVptrUpdate. 413 IRB.CreateCall2(TsanVptrUpdate, 414 IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()), 415 IRB.CreatePointerCast(StoredValue, IRB.getInt8PtrTy())); 416 NumInstrumentedVtableWrites++; 417 return true; 418 } 419 if (!IsWrite && isVtableAccess(I)) { 420 IRB.CreateCall(TsanVptrLoad, 421 IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy())); 422 NumInstrumentedVtableReads++; 423 return true; 424 } 425 Value *OnAccessFunc = IsWrite ? TsanWrite[Idx] : TsanRead[Idx]; 426 IRB.CreateCall(OnAccessFunc, IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy())); 427 if (IsWrite) NumInstrumentedWrites++; 428 else NumInstrumentedReads++; 429 return true; 430} 431 432static ConstantInt *createOrdering(IRBuilder<> *IRB, AtomicOrdering ord) { 433 uint32_t v = 0; 434 switch (ord) { 435 case NotAtomic: assert(false); 436 case Unordered: // Fall-through. 437 case Monotonic: v = 0; break; 438 // case Consume: v = 1; break; // Not specified yet. 439 case Acquire: v = 2; break; 440 case Release: v = 3; break; 441 case AcquireRelease: v = 4; break; 442 case SequentiallyConsistent: v = 5; break; 443 } 444 return IRB->getInt32(v); 445} 446 447static ConstantInt *createFailOrdering(IRBuilder<> *IRB, AtomicOrdering ord) { 448 uint32_t v = 0; 449 switch (ord) { 450 case NotAtomic: assert(false); 451 case Unordered: // Fall-through. 452 case Monotonic: v = 0; break; 453 // case Consume: v = 1; break; // Not specified yet. 454 case Acquire: v = 2; break; 455 case Release: v = 0; break; 456 case AcquireRelease: v = 2; break; 457 case SequentiallyConsistent: v = 5; break; 458 } 459 return IRB->getInt32(v); 460} 461 462// If a memset intrinsic gets inlined by the code gen, we will miss races on it. 463// So, we either need to ensure the intrinsic is not inlined, or instrument it. 464// We do not instrument memset/memmove/memcpy intrinsics (too complicated), 465// instead we simply replace them with regular function calls, which are then 466// intercepted by the run-time. 467// Since tsan is running after everyone else, the calls should not be 468// replaced back with intrinsics. If that becomes wrong at some point, 469// we will need to call e.g. __tsan_memset to avoid the intrinsics. 470bool ThreadSanitizer::instrumentMemIntrinsic(Instruction *I) { 471 IRBuilder<> IRB(I); 472 if (MemSetInst *M = dyn_cast<MemSetInst>(I)) { 473 IRB.CreateCall3(MemsetFn, 474 IRB.CreatePointerCast(M->getArgOperand(0), IRB.getInt8PtrTy()), 475 IRB.CreateIntCast(M->getArgOperand(1), IRB.getInt32Ty(), false), 476 IRB.CreateIntCast(M->getArgOperand(2), IntptrTy, false)); 477 I->eraseFromParent(); 478 } else if (MemTransferInst *M = dyn_cast<MemTransferInst>(I)) { 479 IRB.CreateCall3(isa<MemCpyInst>(M) ? MemcpyFn : MemmoveFn, 480 IRB.CreatePointerCast(M->getArgOperand(0), IRB.getInt8PtrTy()), 481 IRB.CreatePointerCast(M->getArgOperand(1), IRB.getInt8PtrTy()), 482 IRB.CreateIntCast(M->getArgOperand(2), IntptrTy, false)); 483 I->eraseFromParent(); 484 } 485 return false; 486} 487 488// Both llvm and ThreadSanitizer atomic operations are based on C++11/C1x 489// standards. For background see C++11 standard. A slightly older, publically 490// available draft of the standard (not entirely up-to-date, but close enough 491// for casual browsing) is available here: 492// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf 493// The following page contains more background information: 494// http://www.hpl.hp.com/personal/Hans_Boehm/c++mm/ 495 496bool ThreadSanitizer::instrumentAtomic(Instruction *I) { 497 IRBuilder<> IRB(I); 498 if (LoadInst *LI = dyn_cast<LoadInst>(I)) { 499 Value *Addr = LI->getPointerOperand(); 500 int Idx = getMemoryAccessFuncIndex(Addr); 501 if (Idx < 0) 502 return false; 503 const size_t ByteSize = 1 << Idx; 504 const size_t BitSize = ByteSize * 8; 505 Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize); 506 Type *PtrTy = Ty->getPointerTo(); 507 Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy), 508 createOrdering(&IRB, LI->getOrdering())}; 509 CallInst *C = CallInst::Create(TsanAtomicLoad[Idx], 510 ArrayRef<Value*>(Args)); 511 ReplaceInstWithInst(I, C); 512 513 } else if (StoreInst *SI = dyn_cast<StoreInst>(I)) { 514 Value *Addr = SI->getPointerOperand(); 515 int Idx = getMemoryAccessFuncIndex(Addr); 516 if (Idx < 0) 517 return false; 518 const size_t ByteSize = 1 << Idx; 519 const size_t BitSize = ByteSize * 8; 520 Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize); 521 Type *PtrTy = Ty->getPointerTo(); 522 Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy), 523 IRB.CreateIntCast(SI->getValueOperand(), Ty, false), 524 createOrdering(&IRB, SI->getOrdering())}; 525 CallInst *C = CallInst::Create(TsanAtomicStore[Idx], 526 ArrayRef<Value*>(Args)); 527 ReplaceInstWithInst(I, C); 528 } else if (AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(I)) { 529 Value *Addr = RMWI->getPointerOperand(); 530 int Idx = getMemoryAccessFuncIndex(Addr); 531 if (Idx < 0) 532 return false; 533 Function *F = TsanAtomicRMW[RMWI->getOperation()][Idx]; 534 if (F == NULL) 535 return false; 536 const size_t ByteSize = 1 << Idx; 537 const size_t BitSize = ByteSize * 8; 538 Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize); 539 Type *PtrTy = Ty->getPointerTo(); 540 Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy), 541 IRB.CreateIntCast(RMWI->getValOperand(), Ty, false), 542 createOrdering(&IRB, RMWI->getOrdering())}; 543 CallInst *C = CallInst::Create(F, ArrayRef<Value*>(Args)); 544 ReplaceInstWithInst(I, C); 545 } else if (AtomicCmpXchgInst *CASI = dyn_cast<AtomicCmpXchgInst>(I)) { 546 Value *Addr = CASI->getPointerOperand(); 547 int Idx = getMemoryAccessFuncIndex(Addr); 548 if (Idx < 0) 549 return false; 550 const size_t ByteSize = 1 << Idx; 551 const size_t BitSize = ByteSize * 8; 552 Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize); 553 Type *PtrTy = Ty->getPointerTo(); 554 Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy), 555 IRB.CreateIntCast(CASI->getCompareOperand(), Ty, false), 556 IRB.CreateIntCast(CASI->getNewValOperand(), Ty, false), 557 createOrdering(&IRB, CASI->getOrdering()), 558 createFailOrdering(&IRB, CASI->getOrdering())}; 559 CallInst *C = CallInst::Create(TsanAtomicCAS[Idx], ArrayRef<Value*>(Args)); 560 ReplaceInstWithInst(I, C); 561 } else if (FenceInst *FI = dyn_cast<FenceInst>(I)) { 562 Value *Args[] = {createOrdering(&IRB, FI->getOrdering())}; 563 Function *F = FI->getSynchScope() == SingleThread ? 564 TsanAtomicSignalFence : TsanAtomicThreadFence; 565 CallInst *C = CallInst::Create(F, ArrayRef<Value*>(Args)); 566 ReplaceInstWithInst(I, C); 567 } 568 return true; 569} 570 571int ThreadSanitizer::getMemoryAccessFuncIndex(Value *Addr) { 572 Type *OrigPtrTy = Addr->getType(); 573 Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType(); 574 assert(OrigTy->isSized()); 575 uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy); 576 if (TypeSize != 8 && TypeSize != 16 && 577 TypeSize != 32 && TypeSize != 64 && TypeSize != 128) { 578 NumAccessesWithBadSize++; 579 // Ignore all unusual sizes. 580 return -1; 581 } 582 size_t Idx = CountTrailingZeros_32(TypeSize / 8); 583 assert(Idx < kNumberOfAccessSizes); 584 return Idx; 585} 586