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 96a526a..a540f3b 100644
--- a/lib/Basic/SourceManager.cpp
+++ b/lib/Basic/SourceManager.cpp
@@ -732,6 +732,10 @@
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.