New common interface for backends to use

llvm-svn: 7625

llvm/support/tools/TableGen/TableGenBackend.cpp

@@ -0,0 +1,17 @@
+//===- TableGenBackend.cpp - Base class for TableGen Backends ---*- C++ -*-===//
+//
+// This file provides useful services for TableGen backends...
+//
+//===----------------------------------------------------------------------===//
+
+#include "TableGenBackend.h"
+#include <iostream>
+
+void TableGenBackend::EmitSourceFileHeader(const std::string &Desc,
+                                           std::ostream &OS) {
+  OS << "//===- TableGen'erated file -------------------------------------*-"
+       " C++ -*-===//\n//\n// " << Desc << "\n//\n// Automatically generate"
+       "d file, do not edit!\n//\n//===------------------------------------"
+       "----------------------------------===//\n\n";
+}
+

llvm/support/tools/TableGen/TableGenBackend.h

@@ -0,0 +1,26 @@
+//===- 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