From 1ca73445064ac0c9b41d814cc7635b19c57bb703 Mon Sep 17 00:00:00 2001
From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Fri, 1 Mar 2013 03:43:33 +0000
Subject: [PATCH] Add one more sanity check in
 SourceManager::getFileIDLoaded().

llvm-svn: 176333
---
 clang/lib/Basic/SourceManager.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/clang/lib/Basic/SourceManager.cpp b/clang/lib/Basic/SourceManager.cpp
index 8fa648c..1b8383b 100644
--- a/clang/lib/Basic/SourceManager.cpp
+++ b/clang/lib/Basic/SourceManager.cpp
@@ -863,6 +863,11 @@ FileID SourceManager::getFileIDLoaded(unsigned SLocOffset) const {
       return Res;
     }
 
+    // Sanity checking, otherwise a bug may lead to hanging in release build.
+    if (LessIndex == MiddleIndex) {
+      assert(0 && "binary search missed the entry");
+      return FileID();
+    }
     LessIndex = MiddleIndex;
   }
 }
-- 
2.7.4