From 252e03596a25bdcc682e1a9f763bd3cb49e076bb Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Wed, 28 Sep 2011 21:20:00 +0000
Subject: [PATCH] Check for empty predecessors for walking them.

llvm-svn: 140725
---
 clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp b/clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
index 0a38e79c3b29..3afbd8721381 100644
--- a/clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
+++ b/clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
@@ -315,7 +315,7 @@ bugreporter::getTrackNullOrUndefValueVisitor(const ExplodedNode *N,
       if (ps->getStmt() == S)
         break;
     }
-    N = *N->pred_begin();
+    N = N->pred_empty() ? 0 : *N->pred_begin();
   }
 
   if (!N)