Fix undefined behavior: member function calls where 'this' is a null pointer.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162430 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ARCMigrate/Transforms.cpp b/lib/ARCMigrate/Transforms.cpp
index f01dfa9..805a67d 100644
--- a/lib/ARCMigrate/Transforms.cpp
+++ b/lib/ARCMigrate/Transforms.cpp
@@ -59,7 +59,7 @@
return false; // id/NSObject is not safe for weak.
if (!AllowOnUnknownClass && !Class->hasDefinition())
return false; // forward classes are not verifiable, therefore not safe.
- if (Class->isArcWeakrefUnavailable())
+ if (Class && Class->isArcWeakrefUnavailable())
return false;
}