In SourceManager::getFileIDLoaded(), add some sanity checks to make sure we don't enter an infinite loop.
rdar://13120919
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176331 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/SourceManager.cpp b/lib/Basic/SourceManager.cpp
index ea95650..8fa648c 100644
--- a/lib/Basic/SourceManager.cpp
+++ b/lib/Basic/SourceManager.cpp
@@ -840,10 +840,17 @@
++NumProbes;
unsigned MiddleIndex = (LessIndex - GreaterIndex) / 2 + GreaterIndex;
const SrcMgr::SLocEntry &E = getLoadedSLocEntry(MiddleIndex);
+ if (E.getOffset() == 0)
+ return FileID(); // invalid entry.
++NumProbes;
if (E.getOffset() > SLocOffset) {
+ // Sanity checking, otherwise a bug may lead to hanging in release build.
+ if (GreaterIndex == MiddleIndex) {
+ assert(0 && "binary search missed the entry");
+ return FileID();
+ }
GreaterIndex = MiddleIndex;
continue;
}