In ContentCache::replaceBuffer, add sanity check to make sure that we do not free a buffer

and then continue using it. rdar://10359140.

llvm-svn: 146308

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Basic/SourceManager.cpp b/clang/lib/Basic/SourceManager.cpp
index 85fe474..18026db 100644
--- a/clang/lib/Basic/SourceManager.cpp
+++ b/clang/lib/Basic/SourceManager.cpp
@@ -71,7 +71,11 @@ unsigned ContentCache::getSize() const {
 
 void ContentCache::replaceBuffer(const llvm::MemoryBuffer *B,
                                  bool DoNotFree) {
-  assert(B != Buffer.getPointer());
+  if (B == Buffer.getPointer()) {
+    assert(0 && "Replacing with the same buffer");
+    Buffer.setInt(DoNotFree? DoNotFreeFlag : 0);
+    return;
+  }
   
   if (shouldFreeBuffer())
     delete Buffer.getPointer();