Switch from cast<> to dyn_cast<>.

This avoids a potential failed assertion that is happening on someone's out-of-tree build.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@349940 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 2 deletions

diff --git a/utils/TableGen/ClangSACheckersEmitter.cpp b/utils/TableGen/ClangSACheckersEmitter.cpp
index 4f20274334..453dfe564b 100644
--- a/utils/TableGen/ClangSACheckersEmitter.cpp
+++ b/utils/TableGen/ClangSACheckersEmitter.cpp
@@ -63,8 +63,11 @@ static inline uint64_t getValueFromBitsInit(const BitsInit *B) {
 
   uint64_t Value = 0;
   for (unsigned i = 0, e = B->getNumBits(); i != e; ++i) {
-    const auto *Bit = cast<BitInit>(B->getBit(i));
-    Value |= uint64_t(Bit->getValue()) << i;
+    const auto *Bit = dyn_cast<BitInit>(B->getBit(i));
+    if (Bit)
+      Value |= uint64_t(Bit->getValue()) << i;
+    else
+      PrintFatalError("Invalid bits");
   }
   return Value;
 }