#define DEBUG_TYPE "tsan"
-#include "FunctionBlackList.h"
+#include "llvm/Transforms/Instrumentation.h"
+#include "BlackList.h"
+#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
-#include "llvm/Intrinsics.h"
+#include "llvm/DataLayout.h"
#include "llvm/Function.h"
+#include "llvm/IRBuilder.h"
+#include "llvm/Intrinsics.h"
#include "llvm/LLVMContext.h"
#include "llvm/Metadata.h"
#include "llvm/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Support/IRBuilder.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Transforms/Instrumentation.h"
+#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"
#include "llvm/Type.h"
static cl::opt<std::string> ClBlackListFile("tsan-blacklist",
cl::desc("Blacklist file"), cl::Hidden);
+static cl::opt<bool> ClInstrumentMemoryAccesses(
+ "tsan-instrument-memory-accesses", cl::init(true),
+ cl::desc("Instrument memory accesses"), cl::Hidden);
+static cl::opt<bool> ClInstrumentFuncEntryExit(
+ "tsan-instrument-func-entry-exit", cl::init(true),
+ cl::desc("Instrument function entry and exit"), cl::Hidden);
+static cl::opt<bool> ClInstrumentAtomics(
+ "tsan-instrument-atomics", cl::init(true),
+ cl::desc("Instrument atomics"), cl::Hidden);
+
+STATISTIC(NumInstrumentedReads, "Number of instrumented reads");
+STATISTIC(NumInstrumentedWrites, "Number of instrumented writes");
+STATISTIC(NumOmittedReadsBeforeWrite,
+ "Number of reads ignored due to following writes");
+STATISTIC(NumAccessesWithBadSize, "Number of accesses with bad size");
+STATISTIC(NumInstrumentedVtableWrites, "Number of vtable ptr writes");
+STATISTIC(NumOmittedReadsFromConstantGlobals,
+ "Number of reads from constant globals");
+STATISTIC(NumOmittedReadsFromVtable, "Number of vtable reads");
namespace {
+
/// ThreadSanitizer: instrument the code in module to find races.
struct ThreadSanitizer : public FunctionPass {
ThreadSanitizer();
+ const char *getPassName() const;
bool runOnFunction(Function &F);
bool doInitialization(Module &M);
- bool instrumentLoadOrStore(Instruction *I);
static char ID; // Pass identification, replacement for typeid.
private:
- TargetData *TD;
- OwningPtr<FunctionBlackList> BL;
+ void initializeCallbacks(Module &M);
+ bool instrumentLoadOrStore(Instruction *I);
+ bool instrumentAtomic(Instruction *I);
+ void chooseInstructionsToInstrument(SmallVectorImpl<Instruction*> &Local,
+ SmallVectorImpl<Instruction*> &All);
+ bool addrPointsToConstantData(Value *Addr);
+ int getMemoryAccessFuncIndex(Value *Addr);
+
+ DataLayout *TD;
+ OwningPtr<BlackList> BL;
+ IntegerType *OrdTy;
// Callbacks to run-time library are computed in doInitialization.
- Value *TsanFuncEntry;
- Value *TsanFuncExit;
+ Function *TsanFuncEntry;
+ Function *TsanFuncExit;
// Accesses sizes are powers of two: 1, 2, 4, 8, 16.
static const size_t kNumberOfAccessSizes = 5;
- Value *TsanRead[kNumberOfAccessSizes];
- Value *TsanWrite[kNumberOfAccessSizes];
- Value *TsanVptrUpdate;
+ Function *TsanRead[kNumberOfAccessSizes];
+ Function *TsanWrite[kNumberOfAccessSizes];
+ Function *TsanAtomicLoad[kNumberOfAccessSizes];
+ Function *TsanAtomicStore[kNumberOfAccessSizes];
+ Function *TsanAtomicRMW[AtomicRMWInst::LAST_BINOP + 1][kNumberOfAccessSizes];
+ Function *TsanAtomicCAS[kNumberOfAccessSizes];
+ Function *TsanAtomicThreadFence;
+ Function *TsanAtomicSignalFence;
+ Function *TsanVptrUpdate;
};
} // namespace
"ThreadSanitizer: detects data races.",
false, false)
+const char *ThreadSanitizer::getPassName() const {
+ return "ThreadSanitizer";
+}
+
ThreadSanitizer::ThreadSanitizer()
: FunctionPass(ID),
TD(NULL) {
return new ThreadSanitizer();
}
+static Function *checkInterfaceFunction(Constant *FuncOrBitcast) {
+ if (Function *F = dyn_cast<Function>(FuncOrBitcast))
+ return F;
+ FuncOrBitcast->dump();
+ report_fatal_error("ThreadSanitizer interface function redefined");
+}
+
+void ThreadSanitizer::initializeCallbacks(Module &M) {
+ IRBuilder<> IRB(M.getContext());
+ // Initialize the callbacks.
+ TsanFuncEntry = checkInterfaceFunction(M.getOrInsertFunction(
+ "__tsan_func_entry", IRB.getVoidTy(), IRB.getInt8PtrTy(), NULL));
+ TsanFuncExit = checkInterfaceFunction(M.getOrInsertFunction(
+ "__tsan_func_exit", IRB.getVoidTy(), NULL));
+ OrdTy = IRB.getInt32Ty();
+ for (size_t i = 0; i < kNumberOfAccessSizes; ++i) {
+ const size_t ByteSize = 1 << i;
+ const size_t BitSize = ByteSize * 8;
+ SmallString<32> ReadName("__tsan_read" + itostr(ByteSize));
+ TsanRead[i] = checkInterfaceFunction(M.getOrInsertFunction(
+ ReadName, IRB.getVoidTy(), IRB.getInt8PtrTy(), NULL));
+
+ SmallString<32> WriteName("__tsan_write" + itostr(ByteSize));
+ TsanWrite[i] = checkInterfaceFunction(M.getOrInsertFunction(
+ WriteName, IRB.getVoidTy(), IRB.getInt8PtrTy(), NULL));
+
+ Type *Ty = Type::getIntNTy(M.getContext(), BitSize);
+ Type *PtrTy = Ty->getPointerTo();
+ SmallString<32> AtomicLoadName("__tsan_atomic" + itostr(BitSize) +
+ "_load");
+ TsanAtomicLoad[i] = checkInterfaceFunction(M.getOrInsertFunction(
+ AtomicLoadName, Ty, PtrTy, OrdTy, NULL));
+
+ SmallString<32> AtomicStoreName("__tsan_atomic" + itostr(BitSize) +
+ "_store");
+ TsanAtomicStore[i] = checkInterfaceFunction(M.getOrInsertFunction(
+ AtomicStoreName, IRB.getVoidTy(), PtrTy, Ty, OrdTy,
+ NULL));
+
+ for (int op = AtomicRMWInst::FIRST_BINOP;
+ op <= AtomicRMWInst::LAST_BINOP; ++op) {
+ TsanAtomicRMW[op][i] = NULL;
+ const char *NamePart = NULL;
+ if (op == AtomicRMWInst::Xchg)
+ NamePart = "_exchange";
+ else if (op == AtomicRMWInst::Add)
+ NamePart = "_fetch_add";
+ else if (op == AtomicRMWInst::Sub)
+ NamePart = "_fetch_sub";
+ else if (op == AtomicRMWInst::And)
+ NamePart = "_fetch_and";
+ else if (op == AtomicRMWInst::Or)
+ NamePart = "_fetch_or";
+ else if (op == AtomicRMWInst::Xor)
+ NamePart = "_fetch_xor";
+ else if (op == AtomicRMWInst::Nand)
+ NamePart = "_fetch_nand";
+ else
+ continue;
+ SmallString<32> RMWName("__tsan_atomic" + itostr(BitSize) + NamePart);
+ TsanAtomicRMW[op][i] = checkInterfaceFunction(M.getOrInsertFunction(
+ RMWName, Ty, PtrTy, Ty, OrdTy, NULL));
+ }
+
+ SmallString<32> AtomicCASName("__tsan_atomic" + itostr(BitSize) +
+ "_compare_exchange_val");
+ TsanAtomicCAS[i] = checkInterfaceFunction(M.getOrInsertFunction(
+ AtomicCASName, Ty, PtrTy, Ty, Ty, OrdTy, OrdTy, NULL));
+ }
+ TsanVptrUpdate = checkInterfaceFunction(M.getOrInsertFunction(
+ "__tsan_vptr_update", IRB.getVoidTy(), IRB.getInt8PtrTy(),
+ IRB.getInt8PtrTy(), NULL));
+ TsanAtomicThreadFence = checkInterfaceFunction(M.getOrInsertFunction(
+ "__tsan_atomic_thread_fence", IRB.getVoidTy(), OrdTy, NULL));
+ TsanAtomicSignalFence = checkInterfaceFunction(M.getOrInsertFunction(
+ "__tsan_atomic_signal_fence", IRB.getVoidTy(), OrdTy, NULL));
+}
+
bool ThreadSanitizer::doInitialization(Module &M) {
- TD = getAnalysisIfAvailable<TargetData>();
+ TD = getAnalysisIfAvailable<DataLayout>();
if (!TD)
return false;
- BL.reset(new FunctionBlackList(ClBlackListFile));
+ BL.reset(new BlackList(ClBlackListFile));
// Always insert a call to __tsan_init into the module's CTORs.
IRBuilder<> IRB(M.getContext());
IRB.getVoidTy(), NULL);
appendToGlobalCtors(M, cast<Function>(TsanInit), 0);
- // Initialize the callbacks.
- TsanFuncEntry = M.getOrInsertFunction("__tsan_func_entry", IRB.getVoidTy(),
- IRB.getInt8PtrTy(), NULL);
- TsanFuncExit = M.getOrInsertFunction("__tsan_func_exit", IRB.getVoidTy(),
- NULL);
- for (size_t i = 0; i < kNumberOfAccessSizes; ++i) {
- SmallString<32> ReadName("__tsan_read");
- ReadName += itostr(1 << i);
- TsanRead[i] = M.getOrInsertFunction(ReadName, IRB.getVoidTy(),
- IRB.getInt8PtrTy(), NULL);
- SmallString<32> WriteName("__tsan_write");
- WriteName += itostr(1 << i);
- TsanWrite[i] = M.getOrInsertFunction(WriteName, IRB.getVoidTy(),
- IRB.getInt8PtrTy(), NULL);
- }
- TsanVptrUpdate = M.getOrInsertFunction("__tsan_vptr_update", IRB.getVoidTy(),
- IRB.getInt8PtrTy(), IRB.getInt8PtrTy(),
- NULL);
return true;
}
+static bool isVtableAccess(Instruction *I) {
+ if (MDNode *Tag = I->getMetadata(LLVMContext::MD_tbaa)) {
+ if (Tag->getNumOperands() < 1) return false;
+ if (MDString *Tag1 = dyn_cast<MDString>(Tag->getOperand(0))) {
+ if (Tag1->getString() == "vtable pointer") return true;
+ }
+ }
+ return false;
+}
+
+bool ThreadSanitizer::addrPointsToConstantData(Value *Addr) {
+ // If this is a GEP, just analyze its pointer operand.
+ if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Addr))
+ Addr = GEP->getPointerOperand();
+
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Addr)) {
+ if (GV->isConstant()) {
+ // Reads from constant globals can not race with any writes.
+ NumOmittedReadsFromConstantGlobals++;
+ return true;
+ }
+ } else if (LoadInst *L = dyn_cast<LoadInst>(Addr)) {
+ if (isVtableAccess(L)) {
+ // Reads from a vtable pointer can not race with any writes.
+ NumOmittedReadsFromVtable++;
+ return true;
+ }
+ }
+ return false;
+}
+
+// Instrumenting some of the accesses may be proven redundant.
+// Currently handled:
+// - read-before-write (within same BB, no calls between)
+//
+// We do not handle some of the patterns that should not survive
+// after the classic compiler optimizations.
+// E.g. two reads from the same temp should be eliminated by CSE,
+// two writes should be eliminated by DSE, etc.
+//
+// 'Local' is a vector of insns within the same BB (no calls between).
+// 'All' is a vector of insns that will be instrumented.
+void ThreadSanitizer::chooseInstructionsToInstrument(
+ SmallVectorImpl<Instruction*> &Local,
+ SmallVectorImpl<Instruction*> &All) {
+ SmallSet<Value*, 8> WriteTargets;
+ // Iterate from the end.
+ for (SmallVectorImpl<Instruction*>::reverse_iterator It = Local.rbegin(),
+ E = Local.rend(); It != E; ++It) {
+ Instruction *I = *It;
+ if (StoreInst *Store = dyn_cast<StoreInst>(I)) {
+ WriteTargets.insert(Store->getPointerOperand());
+ } else {
+ LoadInst *Load = cast<LoadInst>(I);
+ Value *Addr = Load->getPointerOperand();
+ if (WriteTargets.count(Addr)) {
+ // We will write to this temp, so no reason to analyze the read.
+ NumOmittedReadsBeforeWrite++;
+ continue;
+ }
+ if (addrPointsToConstantData(Addr)) {
+ // Addr points to some constant data -- it can not race with any writes.
+ continue;
+ }
+ }
+ All.push_back(I);
+ }
+ Local.clear();
+}
+
+static bool isAtomic(Instruction *I) {
+ if (LoadInst *LI = dyn_cast<LoadInst>(I))
+ return LI->isAtomic() && LI->getSynchScope() == CrossThread;
+ if (StoreInst *SI = dyn_cast<StoreInst>(I))
+ return SI->isAtomic() && SI->getSynchScope() == CrossThread;
+ if (isa<AtomicRMWInst>(I))
+ return true;
+ if (isa<AtomicCmpXchgInst>(I))
+ return true;
+ if (isa<FenceInst>(I))
+ return true;
+ return false;
+}
+
bool ThreadSanitizer::runOnFunction(Function &F) {
if (!TD) return false;
if (BL->isIn(F)) return false;
+ initializeCallbacks(*F.getParent());
SmallVector<Instruction*, 8> RetVec;
- SmallVector<Instruction*, 8> LoadsAndStores;
+ SmallVector<Instruction*, 8> AllLoadsAndStores;
+ SmallVector<Instruction*, 8> LocalLoadsAndStores;
+ SmallVector<Instruction*, 8> AtomicAccesses;
bool Res = false;
bool HasCalls = false;
BasicBlock &BB = *FI;
for (BasicBlock::iterator BI = BB.begin(), BE = BB.end();
BI != BE; ++BI) {
- if (isa<LoadInst>(BI) || isa<StoreInst>(BI))
- LoadsAndStores.push_back(BI);
+ if (isAtomic(BI))
+ AtomicAccesses.push_back(BI);
+ else if (isa<LoadInst>(BI) || isa<StoreInst>(BI))
+ LocalLoadsAndStores.push_back(BI);
else if (isa<ReturnInst>(BI))
RetVec.push_back(BI);
- else if (isa<CallInst>(BI) || isa<InvokeInst>(BI))
+ else if (isa<CallInst>(BI) || isa<InvokeInst>(BI)) {
HasCalls = true;
+ chooseInstructionsToInstrument(LocalLoadsAndStores, AllLoadsAndStores);
+ }
}
+ chooseInstructionsToInstrument(LocalLoadsAndStores, AllLoadsAndStores);
}
// We have collected all loads and stores.
// (e.g. variables that do not escape, etc).
// Instrument memory accesses.
- for (size_t i = 0, n = LoadsAndStores.size(); i < n; ++i) {
- Res |= instrumentLoadOrStore(LoadsAndStores[i]);
- }
+ if (ClInstrumentMemoryAccesses)
+ for (size_t i = 0, n = AllLoadsAndStores.size(); i < n; ++i) {
+ Res |= instrumentLoadOrStore(AllLoadsAndStores[i]);
+ }
+
+ // Instrument atomic memory accesses.
+ if (ClInstrumentAtomics)
+ for (size_t i = 0, n = AtomicAccesses.size(); i < n; ++i) {
+ Res |= instrumentAtomic(AtomicAccesses[i]);
+ }
// Instrument function entry/exit points if there were instrumented accesses.
- if (Res || HasCalls) {
+ if ((Res || HasCalls) && ClInstrumentFuncEntryExit) {
IRBuilder<> IRB(F.getEntryBlock().getFirstNonPHI());
Value *ReturnAddress = IRB.CreateCall(
Intrinsic::getDeclaration(F.getParent(), Intrinsic::returnaddress),
return Res;
}
-static bool isVtableAccess(Instruction *I) {
- if (MDNode *Tag = I->getMetadata(LLVMContext::MD_tbaa)) {
- if (Tag->getNumOperands() < 1) return false;
- if (MDString *Tag1 = dyn_cast<MDString>(Tag->getOperand(0))) {
- if (Tag1->getString() == "vtable pointer") return true;
- }
- }
- return false;
-}
-
bool ThreadSanitizer::instrumentLoadOrStore(Instruction *I) {
IRBuilder<> IRB(I);
bool IsWrite = isa<StoreInst>(*I);
Value *Addr = IsWrite
? cast<StoreInst>(I)->getPointerOperand()
: cast<LoadInst>(I)->getPointerOperand();
- Type *OrigPtrTy = Addr->getType();
- Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType();
- assert(OrigTy->isSized());
- uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy);
- if (TypeSize != 8 && TypeSize != 16 &&
- TypeSize != 32 && TypeSize != 64 && TypeSize != 128) {
- // Ignore all unusual sizes.
+ int Idx = getMemoryAccessFuncIndex(Addr);
+ if (Idx < 0)
return false;
- }
if (IsWrite && isVtableAccess(I)) {
+ DEBUG(dbgs() << " VPTR : " << *I << "\n");
Value *StoredValue = cast<StoreInst>(I)->getValueOperand();
+ // StoredValue does not necessary have a pointer type.
+ if (isa<IntegerType>(StoredValue->getType()))
+ StoredValue = IRB.CreateIntToPtr(StoredValue, IRB.getInt8PtrTy());
+ // Call TsanVptrUpdate.
IRB.CreateCall2(TsanVptrUpdate,
IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()),
IRB.CreatePointerCast(StoredValue, IRB.getInt8PtrTy()));
+ NumInstrumentedVtableWrites++;
return true;
}
- size_t Idx = CountTrailingZeros_32(TypeSize / 8);
- assert(Idx < kNumberOfAccessSizes);
Value *OnAccessFunc = IsWrite ? TsanWrite[Idx] : TsanRead[Idx];
IRB.CreateCall(OnAccessFunc, IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()));
+ if (IsWrite) NumInstrumentedWrites++;
+ else NumInstrumentedReads++;
+ return true;
+}
+
+static ConstantInt *createOrdering(IRBuilder<> *IRB, AtomicOrdering ord) {
+ uint32_t v = 0;
+ switch (ord) {
+ case NotAtomic: assert(false);
+ case Unordered: // Fall-through.
+ case Monotonic: v = 0; break;
+ // case Consume: v = 1; break; // Not specified yet.
+ case Acquire: v = 2; break;
+ case Release: v = 3; break;
+ case AcquireRelease: v = 4; break;
+ case SequentiallyConsistent: v = 5; break;
+ }
+ return IRB->getInt32(v);
+}
+
+static ConstantInt *createFailOrdering(IRBuilder<> *IRB, AtomicOrdering ord) {
+ uint32_t v = 0;
+ switch (ord) {
+ case NotAtomic: assert(false);
+ case Unordered: // Fall-through.
+ case Monotonic: v = 0; break;
+ // case Consume: v = 1; break; // Not specified yet.
+ case Acquire: v = 2; break;
+ case Release: v = 0; break;
+ case AcquireRelease: v = 2; break;
+ case SequentiallyConsistent: v = 5; break;
+ }
+ return IRB->getInt32(v);
+}
+
+// Both llvm and ThreadSanitizer atomic operations are based on C++11/C1x
+// standards. For background see C++11 standard. A slightly older, publically
+// available draft of the standard (not entirely up-to-date, but close enough
+// for casual browsing) is available here:
+// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf
+// The following page contains more background information:
+// http://www.hpl.hp.com/personal/Hans_Boehm/c++mm/
+
+bool ThreadSanitizer::instrumentAtomic(Instruction *I) {
+ IRBuilder<> IRB(I);
+ if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
+ Value *Addr = LI->getPointerOperand();
+ int Idx = getMemoryAccessFuncIndex(Addr);
+ if (Idx < 0)
+ return false;
+ const size_t ByteSize = 1 << Idx;
+ const size_t BitSize = ByteSize * 8;
+ Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize);
+ Type *PtrTy = Ty->getPointerTo();
+ Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy),
+ createOrdering(&IRB, LI->getOrdering())};
+ CallInst *C = CallInst::Create(TsanAtomicLoad[Idx],
+ ArrayRef<Value*>(Args));
+ ReplaceInstWithInst(I, C);
+
+ } else if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
+ Value *Addr = SI->getPointerOperand();
+ int Idx = getMemoryAccessFuncIndex(Addr);
+ if (Idx < 0)
+ return false;
+ const size_t ByteSize = 1 << Idx;
+ const size_t BitSize = ByteSize * 8;
+ Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize);
+ Type *PtrTy = Ty->getPointerTo();
+ Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy),
+ IRB.CreateIntCast(SI->getValueOperand(), Ty, false),
+ createOrdering(&IRB, SI->getOrdering())};
+ CallInst *C = CallInst::Create(TsanAtomicStore[Idx],
+ ArrayRef<Value*>(Args));
+ ReplaceInstWithInst(I, C);
+ } else if (AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(I)) {
+ Value *Addr = RMWI->getPointerOperand();
+ int Idx = getMemoryAccessFuncIndex(Addr);
+ if (Idx < 0)
+ return false;
+ Function *F = TsanAtomicRMW[RMWI->getOperation()][Idx];
+ if (F == NULL)
+ return false;
+ const size_t ByteSize = 1 << Idx;
+ const size_t BitSize = ByteSize * 8;
+ Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize);
+ Type *PtrTy = Ty->getPointerTo();
+ Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy),
+ IRB.CreateIntCast(RMWI->getValOperand(), Ty, false),
+ createOrdering(&IRB, RMWI->getOrdering())};
+ CallInst *C = CallInst::Create(F, ArrayRef<Value*>(Args));
+ ReplaceInstWithInst(I, C);
+ } else if (AtomicCmpXchgInst *CASI = dyn_cast<AtomicCmpXchgInst>(I)) {
+ Value *Addr = CASI->getPointerOperand();
+ int Idx = getMemoryAccessFuncIndex(Addr);
+ if (Idx < 0)
+ return false;
+ const size_t ByteSize = 1 << Idx;
+ const size_t BitSize = ByteSize * 8;
+ Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize);
+ Type *PtrTy = Ty->getPointerTo();
+ Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy),
+ IRB.CreateIntCast(CASI->getCompareOperand(), Ty, false),
+ IRB.CreateIntCast(CASI->getNewValOperand(), Ty, false),
+ createOrdering(&IRB, CASI->getOrdering()),
+ createFailOrdering(&IRB, CASI->getOrdering())};
+ CallInst *C = CallInst::Create(TsanAtomicCAS[Idx], ArrayRef<Value*>(Args));
+ ReplaceInstWithInst(I, C);
+ } else if (FenceInst *FI = dyn_cast<FenceInst>(I)) {
+ Value *Args[] = {createOrdering(&IRB, FI->getOrdering())};
+ Function *F = FI->getSynchScope() == SingleThread ?
+ TsanAtomicSignalFence : TsanAtomicThreadFence;
+ CallInst *C = CallInst::Create(F, ArrayRef<Value*>(Args));
+ ReplaceInstWithInst(I, C);
+ }
return true;
}
+
+int ThreadSanitizer::getMemoryAccessFuncIndex(Value *Addr) {
+ Type *OrigPtrTy = Addr->getType();
+ Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType();
+ assert(OrigTy->isSized());
+ uint32_t TypeSize = TD->getTypeStoreSizeInBits(OrigTy);
+ if (TypeSize != 8 && TypeSize != 16 &&
+ TypeSize != 32 && TypeSize != 64 && TypeSize != 128) {
+ NumAccessesWithBadSize++;
+ // Ignore all unusual sizes.
+ return -1;
+ }
+ size_t Idx = CountTrailingZeros_32(TypeSize / 8);
+ assert(Idx < kNumberOfAccessSizes);
+ return Idx;
+}
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