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diff --git a/support/tools/TableGen/TableGenBackend.h b/support/tools/TableGen/TableGenBackend.h
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+//===- TableGenBackend.h - Base class for TableGen Backends -----*- C++ -*-===//
+//
+// The TableGenBackend class is provided as a common interface for all TableGen
+// backends. It provides useful services and an standardized interface.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef TABLEGENBACKEND_H
+#define TABLEGENBACKEND_H
+
+#include <string>
+#include <iosfwd>
+
+struct TableGenBackend {
+
+ // run - All TableGen backends should implement the run method, which should
+ // be the main entry point.
+ virtual void run(std::ostream &OS) = 0;
+
+
+public: // Useful helper routines...
+ void EmitSourceFileHeader(const std::string &Desc, std::ostream &OS) const;
+
+};
+
+#endif