1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 7b62bab..e95d7b1 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -4826,7 +4826,13 @@ Error BitcodeReader::parseFunctionBody(Function *F) {
       const DataLayout &DL = TheModule->getDataLayout();
       unsigned AS = DL.getAllocaAddrSpace();
 
-      AllocaInst *AI = new AllocaInst(Ty, AS, Size, Align);
+      SmallPtrSet<Type *, 4> Visited;
+      if (!Align && !Ty->isSized(&Visited))
+        return error("alloca of unsized type");
+      if (!Align)
+        Align = DL.getPrefTypeAlign(Ty);
+
+      AllocaInst *AI = new AllocaInst(Ty, AS, Size, *Align);
       AI->setUsedWithInAlloca(InAlloca);
       AI->setSwiftError(SwiftError);
       I = AI;