//===- Translation.h - Translation registry ---------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Registry for user-provided translations.
//
//===----------------------------------------------------------------------===//
#ifndef MLIR_TRANSLATION_H
#define MLIR_TRANSLATION_H

#include "llvm/Support/CommandLine.h"

namespace llvm {
class MemoryBuffer;
class SourceMgr;
class StringRef;
} // namespace llvm

namespace mlir {
struct LogicalResult;
class MLIRContext;
class ModuleOp;
class OwningModuleRef;

/// Interface of the function that translates the sources managed by `sourceMgr`
/// to MLIR. The source manager has at least one buffer. The implementation
/// should create a new MLIR ModuleOp in the given context and return a pointer
/// to it, or a nullptr in case of any error.
using TranslateSourceMgrToMLIRFunction =
    std::function<OwningModuleRef(llvm::SourceMgr &sourceMgr, MLIRContext *)>;

/// Interface of the function that translates the given string to MLIR. The
/// implementation should create a new MLIR ModuleOp in the given context. If
/// source-related error reporting is required from within the function, use
/// TranslateSourceMgrToMLIRFunction instead.
using TranslateStringRefToMLIRFunction =
    std::function<OwningModuleRef(llvm::StringRef, MLIRContext *)>;

/// Interface of the function that translates MLIR to a different format and
/// outputs the result to a stream. It is allowed to modify the module.
using TranslateFromMLIRFunction =
    std::function<LogicalResult(ModuleOp, llvm::raw_ostream &output)>;

/// Interface of the function that performs file-to-file translation involving
/// MLIR. The input file is held in the given MemoryBuffer; the output file
/// should be written to the given raw_ostream. The implementation should create
/// all MLIR constructs needed during the process inside the given context. This
/// can be used for round-tripping external formats through the MLIR system.
using TranslateFunction = std::function<LogicalResult(
    llvm::SourceMgr &sourceMgr, llvm::raw_ostream &output, MLIRContext *)>;

/// Use Translate[ToMLIR|FromMLIR]Registration as an initializer that
/// registers a function and associates it with name. This requires that a
/// translation has not been registered to a given name.
///
/// Usage:
///
///   // At file scope.
///   namespace mlir {
///   void registerTRexToMLIRRegistration() {
///     TranslateToMLIRRegistration Unused(&MySubCommand, [] { ... });
///   }
///   } // namespace mlir
///
/// \{
struct TranslateToMLIRRegistration {
  TranslateToMLIRRegistration(llvm::StringRef name,
                              const TranslateSourceMgrToMLIRFunction &function);
  TranslateToMLIRRegistration(llvm::StringRef name,
                              const TranslateStringRefToMLIRFunction &function);
};

struct TranslateFromMLIRRegistration {
  TranslateFromMLIRRegistration(llvm::StringRef name,
                                const TranslateFromMLIRFunction &function);
};
struct TranslateRegistration {
  TranslateRegistration(llvm::StringRef name,
                        const TranslateFunction &function);
};
/// \}

/// A command line parser for translation functions.
struct TranslationParser : public llvm::cl::parser<const TranslateFunction *> {
  TranslationParser(llvm::cl::Option &opt);

  void printOptionInfo(const llvm::cl::Option &o,
                       size_t globalWidth) const override;
};
} // namespace mlir

#endif // MLIR_TRANSLATION_H