Avoid crash when child iterator gives null result.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65812 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/CGBlocks.cpp b/lib/CodeGen/CGBlocks.cpp
index e50b320a0cd21bde799e089d0649afd2e55bcff8..ee17a862b16145496279ee23d72048f999d1e846 100644 (file)
--- a/lib/CodeGen/CGBlocks.cpp
+++ b/lib/CodeGen/CGBlocks.cpp
@@ -111,7 +111,8 @@ static void CollectBlockDeclRefInfo(const Stmt *S,
                                     CodeGenFunction::BlockInfo &Info) {
   for (Stmt::const_child_iterator I = S->child_begin(), E = S->child_end();
        I != E; ++I)
-    CollectBlockDeclRefInfo(*I, Info);
+    if (*I)
+      CollectBlockDeclRefInfo(*I, Info);
   
   if (const BlockDeclRefExpr *DE = dyn_cast<BlockDeclRefExpr>(S)) {
     // FIXME: Handle enums.