From: Devang Patel <dpatel@apple.com>
Date: Fri, 14 Aug 2009 20:57:45 +0000 (+0000)
Subject: Do now overflow while calulating upper bound for zero sized array.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5a6bfe35051c1c14b63e1fa103c2cc512dab66b8;p=clang

Do now overflow while calulating upper bound for zero sized array.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@79043 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index ee2a94067d..6547434883 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -722,8 +722,9 @@ llvm::DIType CGDebugInfo::CreateType(const ArrayType *Ty,
   QualType EltTy(Ty, 0);
   while ((Ty = dyn_cast<ArrayType>(EltTy))) {
     uint64_t Upper = 0;
-    if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty))
-      Upper = CAT->getSize().getZExtValue() - 1;
+    if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty)) 
+      if (CAT->getSize().getZExtValue())
+	Upper = CAT->getSize().getZExtValue() - 1;
     // FIXME: Verify this is right for VLAs.
     Subscripts.push_back(DebugFactory.GetOrCreateSubrange(0, Upper));
     EltTy = Ty->getElementType();