Continue sketching out basic infrastructure, including an input and output
filename, and printing of trivial stuff.  There is no parser yet, so the
input file is ignored.

PiperOrigin-RevId: 201596916
diff --git a/include/mlir/IR/Module.h b/include/mlir/IR/Module.h
new file mode 100644
index 0000000..037e288
--- /dev/null
+++ b/include/mlir/IR/Module.h
@@ -0,0 +1,42 @@
+//===- Module.h - MLIR Module Class -----------------------------*- C++ -*-===//
+//
+// Copyright 2019 The MLIR Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// =============================================================================
+//
+// Module is the top-level container for code in an MLIR program.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_IR_MODULE_H
+#define MLIR_IR_MODULE_H
+
+#include "mlir/IR/Function.h"
+#include <vector>
+
+namespace mlir {
+class Module {
+public:
+  explicit Module();
+
+  // FIXME: wrong representation and API.
+  std::vector<Function*> functionList;
+
+
+  void print(raw_ostream &os);
+  void dump();
+};
+} // end namespace mlir
+
+#endif  // MLIR_IR_FUNCTION_H