From 1facf89eafb82226278693ca6eee4819d3dfc86f Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 17 Oct 2003 18:03:54 +0000
Subject: [PATCH] Do not crash on empty structures

llvm-svn: 9195
---
 llvm/lib/Transforms/TransformInternals.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/llvm/lib/Transforms/TransformInternals.cpp b/llvm/lib/Transforms/TransformInternals.cpp
index f726e829aa60..820dd3878e0c 100644
--- a/llvm/lib/Transforms/TransformInternals.cpp
+++ b/llvm/lib/Transforms/TransformInternals.cpp
@@ -53,6 +53,11 @@ const Type *getStructOffsetType(const Type *Ty, unsigned &Offset,
   uint64_t ThisOffset;
   const Type *NextType;
   if (const StructType *STy = dyn_cast<StructType>(Ty)) {
+    if (STy->getElementTypes().empty()) {
+      Offset = 0;
+      return STy;
+    }
+
     ThisOffset = Offset;
     NextType = getStructOffsetStep(STy, ThisOffset, Indices, TD);
   } else if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {