1 files changed, 9 insertions, 0 deletions
diff --git a/compiler-rt/lib/msan/msan.h b/compiler-rt/lib/msan/msan.h
index e95ac9e6c8a..5d5ca570c99 100644
--- a/compiler-rt/lib/msan/msan.h
+++ b/compiler-rt/lib/msan/msan.h
@@ -86,6 +86,15 @@ void UnpoisonThreadLocalState();
         StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(),           \
         common_flags()->fast_unwind_on_malloc)
 
+class ScopedThreadLocalStateBackup {
+public:
+  ScopedThreadLocalStateBackup() { Backup(); }
+  ~ScopedThreadLocalStateBackup() { Restore(); }
+  void Backup();
+  void Restore();
+private:
+  u64 va_arg_overflow_size_tls;
+};
 }  // namespace __msan
 
 #define MSAN_MALLOC_HOOK(ptr, size) \