From a4a0cf8394627f8380c9e14b20900001efd56dee Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@apple.com>
Date: Fri, 16 Mar 2012 00:21:54 +0000
Subject: [PATCH] Do the right thing on NULL uint64 fields.

Patch by Clemens Hammacher!

Fixes PR12243

llvm-svn: 152880
---
 llvm/lib/Analysis/DebugInfo.cpp           | 2 +-
 llvm/test/DebugInfo/bug_null_debuginfo.ll | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 llvm/test/DebugInfo/bug_null_debuginfo.ll

diff --git a/llvm/lib/Analysis/DebugInfo.cpp b/llvm/lib/Analysis/DebugInfo.cpp
index 585a087a02ac..e30c0a9b3306 100644
--- a/llvm/lib/Analysis/DebugInfo.cpp
+++ b/llvm/lib/Analysis/DebugInfo.cpp
@@ -68,7 +68,7 @@ uint64_t DIDescriptor::getUInt64Field(unsigned Elt) const {
     return 0;
 
   if (Elt < DbgNode->getNumOperands())
-    if (ConstantInt *CI = dyn_cast<ConstantInt>(DbgNode->getOperand(Elt)))
+    if (ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DbgNode->getOperand(Elt)))
       return CI->getZExtValue();
 
   return 0;
diff --git a/llvm/test/DebugInfo/bug_null_debuginfo.ll b/llvm/test/DebugInfo/bug_null_debuginfo.ll
new file mode 100644
index 000000000000..a7fdf70d71c7
--- /dev/null
+++ b/llvm/test/DebugInfo/bug_null_debuginfo.ll
@@ -0,0 +1,6 @@
+; RUN: llc
+
+
+!llvm.dbg.cu = !{!0}
+
+!0 = metadata !{null, null, null}