From 3a45e034423ca8811846065ad27fc87e5859cf2f Mon Sep 17 00:00:00 2001
From: Jim Ingham <jingham@apple.com>
Date: Thu, 7 Jul 2016 19:06:37 +0000
Subject: [PATCH] Check whether Sema::CreateBuiltinUnaryOp returns an empty
 result.

If it does, calling AddInitializerToDecl will crash, so we should
abort the result synthesis in this case.

<rdar://problem/27205383>

llvm-svn: 274787
---
 .../Plugins/ExpressionParser/Clang/ASTResultSynthesizer.cpp     | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ASTResultSynthesizer.cpp b/lldb/source/Plugins/ExpressionParser/Clang/ASTResultSynthesizer.cpp
index 44bbfcbca3cd..f1231572e263 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ASTResultSynthesizer.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ASTResultSynthesizer.cpp
@@ -373,6 +373,8 @@ ASTResultSynthesizer::SynthesizeBodyResult (CompoundStmt *Body,
         ExprResult address_of_expr = m_sema->CreateBuiltinUnaryOp(SourceLocation(), UO_AddrOf, last_expr);
         if (address_of_expr.get())
             m_sema->AddInitializerToDecl(result_decl, address_of_expr.get(), true, false);
+        else
+            return false;
     }
     else
     {