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+//===- ViewOp.h - Linalg dialect ViewOp operation definition ------------===//
+//
+// 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.
+// =============================================================================
+
+#ifndef LINALG1_VIEWOP_H_
+#define LINALG1_VIEWOP_H_
+
+#include "mlir/IR/OpDefinition.h"
+#include "mlir/Support/LLVM.h"
+
+namespace linalg {
+
+class ViewType;
+
+/// A `ViewOp` produces a `ViewType` which is a multi-dimensional range
+/// abstraction on top of an underlying data type. For now we use the existing
+/// mlir::MemRef for the underlying data type.
+class ViewOp : public mlir::Op<ViewOp, mlir::OpTrait::VariadicOperands,
+                               mlir::OpTrait::OneResult,
+                               mlir::OpTrait::HasNoSideEffect> {
+public:
+  using Op::Op;
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Hooks to customize the behavior of this op.
+  //////////////////////////////////////////////////////////////////////////////
+  static llvm::StringRef getOperationName() { return "linalg.view"; }
+  static void build(mlir::Builder *b, mlir::OperationState *result,
+                    mlir::Value *memRef,
+                    llvm::ArrayRef<mlir::Value *> indexings);
+  mlir::LogicalResult verify();
+  static bool parse(mlir::OpAsmParser *parser, mlir::OperationState *result);
+  void print(mlir::OpAsmPrinter *p);
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Op-specific functionality.
+  //////////////////////////////////////////////////////////////////////////////
+  enum { FirstIndexingOperand = 1 };
+  unsigned getRank();
+  mlir::Type getElementType();
+  ViewType getViewType();
+  // May be something else than a MemRef in the future.
+  mlir::Value *getSupportingMemRef();
+  // Get the underlying indexing at a given rank.
+  mlir::Value *getIndexing(unsigned rank);
+  // Get all the indexings of type RangeOp.
+  llvm::SmallVector<mlir::Value *, 8> getRanges();
+  // Get all the indexings in this view.
+  mlir::Operation::operand_range getIndexings();
+};
+
+} // namespace linalg
+
+#endif // LINALG1_VIEWOP_H_