[asan] Do not instrument pointers with address space attributes

Do not instrument pointers with address space attributes since we cannot track
them anyway. Instrumenting them results in false positives in ASan and a
compiler crash in TSan. (The compiler should not crash in any case, but that's
a different problem.)

llvm-svn: 273339

1 files changed, 9 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Instrumentation/ThreadSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/ThreadSanitizer.cpp
index 22a26d4..287d5bf 100644
--- a/llvm/lib/Transforms/Instrumentation/ThreadSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/ThreadSanitizer.cpp
@@ -276,6 +276,15 @@ static bool shouldInstrumentReadWriteFromAddress(Value *Addr) {
     if (GV->getName() == "__llvm_gcov_ctr")
       return false;
   }
+
+  // Do not instrument acesses from different address spaces; we cannot deal
+  // with them.
+  if (Addr) {
+    Type *PtrTy = cast<PointerType>(Addr->getType()->getScalarType());
+    if (PtrTy->getPointerAddressSpace() != 0)
+      return false;
+  }
+
   return true;
 }