diff --git a/lib/Sema/AnalysisBasedWarnings.h b/lib/Sema/AnalysisBasedWarnings.h
new file mode 100644
index 0000000..39da1b1
--- /dev/null
+++ b/lib/Sema/AnalysisBasedWarnings.h
@@ -0,0 +1,35 @@
+//=- AnalysisBasedWarnings.h - Sema warnings based on libAnalysis -*- C++ -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines AnalysisBasedWarnings, a worker object used by Sema
+// that issues warnings based on dataflow-analysis.
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SEMA_ANALYSIS_WARNINGS_H
+#define LLVM_CLANG_SEMA_ANALYSIS_WARNINGS_H
+
+namespace clang { namespace sema {
+
+class AnalysisBasedWarnings {
+  Sema &S;
+  // The warnings to run.
+  unsigned enableCheckFallThrough : 1;
+  unsigned enableCheckUnreachable : 1;
+  
+public:
+
+  AnalysisBasedWarnings(Sema &s);
+  void IssueWarnings(const Decl *D, QualType BlockTy = QualType());
+  
+  void disableCheckFallThrough() { enableCheckFallThrough = 0; }
+};
+  
+}} // end namespace clang::sema
+
+#endif