It helps a lot when you check for the end of your list before randomly

dereferencing things.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42605 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/ADT/SparseBitVector.h b/include/llvm/ADT/SparseBitVector.h
index d1e91250680deb7bb603872e7aef30b415ce90dd..b02eb3e48059762f89c412ca632ba7b67ce582b7 100644 (file)
--- a/include/llvm/ADT/SparseBitVector.h
+++ b/include/llvm/ADT/SparseBitVector.h
@@ -538,7 +538,8 @@ public:
         // We may have hit the beginning of our SparseBitVector, in which case,
         // we may need to insert right after this element, which requires moving
         // the current iterator forward one, because insert does insert before.
-        if (ElementIter->index() < ElementIndex)
+        if (ElementIter != Elements.end() &&
+            ElementIter->index() < ElementIndex)
           ElementIter = Elements.insert(++ElementIter, Element);
         else
           ElementIter = Elements.insert(ElementIter, Element);