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[tsan] fix instrumentation of vector vptr updates (https://code.google.com/p/thread-sanitizer/issues/detail?id=43)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196079 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany
2013-12-02 08:07:15 +00:00
parent bc134cb1f1
commit dfb74a58c5
2 changed files with 24 additions and 4 deletions
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lib/Transforms/Instrumentation/ThreadSanitizer.cpp
+7 -4
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@@ -402,13 +402,16 @@ bool ThreadSanitizer::instrumentLoadOrStore(Instruction *I) {
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());
// StoredValue may be a vector type if we are storing several vptrs at once.
// In this case, just take the first element of the vector since this is
// enough to find vptr races.
if (isa<VectorType>(StoredValue->getType()))
StoredValue = IRB.CreateExtractElement(
StoredValue, ConstantInt::get(IRB.getInt32Ty(), 0));
// Call TsanVptrUpdate.
IRB.CreateCall2(TsanVptrUpdate,
IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()),
IRB.CreatePointerCast(StoredValue, IRB.getInt8PtrTy()));
IRB.CreateBitCast(StoredValue, IRB.getInt8PtrTy()));
NumInstrumentedVtableWrites++;
return true;
}