From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Mon, 3 Oct 2011 23:43:01 +0000 (+0000)
Subject: Make sure SourceManager::getFileIDLoaded doesn't hang in release build because of... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c3b4575b77164fdf008cd4acc330884d56ca500f;p=clang

Make sure SourceManager::getFileIDLoaded doesn't hang in release build because of invalid passed parameter.
rdar://10210140

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141048 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Basic/SourceManager.cpp b/lib/Basic/SourceManager.cpp
index 96a526ad14..a540f3b945 100644
--- a/lib/Basic/SourceManager.cpp
+++ b/lib/Basic/SourceManager.cpp
@@ -732,6 +732,10 @@ FileID SourceManager::getFileIDLocal(unsigned SLocOffset) const {
 FileID SourceManager::getFileIDLoaded(unsigned SLocOffset) const {
   assert(SLocOffset >= CurrentLoadedOffset && "Bad function choice");
 
+  // Sanity checking, otherwise a bug may lead to hanging in release build.
+  if (SLocOffset < CurrentLoadedOffset)
+    return FileID();
+
   // Essentially the same as the local case, but the loaded array is sorted
   // in the other direction.