From baae246fb8bf406ca6ac5a43dfa528bbc7690bbc Mon Sep 17 00:00:00 2001
From: Adrian Prantl <aprantl@apple.com>
Date: Mon, 12 May 2014 20:59:57 +0000
Subject: [PATCH] Debug Info: Do not crash when the size of a piece cannot be
 determined.

Swift SVN r17958
---
 lib/IRGen/IRGenDebugInfo.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/IRGen/IRGenDebugInfo.cpp b/lib/IRGen/IRGenDebugInfo.cpp
index 89cfb9b8b03..3b9df13107d 100644
--- a/lib/IRGen/IRGenDebugInfo.cpp
+++ b/lib/IRGen/IRGenDebugInfo.cpp
@@ -974,6 +974,8 @@ void IRGenDebugInfo::emitVariableDeclaration(IRBuilder& Builder,
         llvm::RoundUpToAlignment(Dim.Size, Dim.Align) / SizeOfByte;
 
       assert(Offset*8+Dim.Size<=Var.getSizeInBits(DIRefMap) && "pars > totum");
+      if (Size == 0)
+        break;
       Var = DBuilder.createVariablePiece(Descriptor, Offset, Size);
       Offset += Size;
     }