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+//===- Lowering.h - Lexer for the Toy language ----------------------------===//
+//
+// 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.
+// =============================================================================
+//
+// This file exposes the interface to the lowering for Toy. It is divided in
+// two parts:  an *early lowering* that emits operations in the `Linalg`
+// dialects for a subset of the Toy IR, and a *late lowering* that materializes
+// buffers and converts all operations and type to the LLVM dialect.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_EXAMPLES_TOY_LOWERING_H_
+#define MLIR_EXAMPLES_TOY_LOWERING_H_
+
+#include <memory>
+
+namespace mlir {
+class Pass;
+class DialectConversion;
+} // namespace mlir
+
+namespace toy {
+/// Create a pass for lowering operations in the `Linalg` dialects, for a subset
+/// of the Toy IR (matmul).
+mlir::Pass *createEarlyLoweringPass();
+
+/// Create a pass for the late lowering toward LLVM dialect.
+mlir::Pass *createLateLoweringPass();
+
+} // namespace toy
+
+#endif // MLIR_EXAMPLES_TOY_LOWERING_H_