[mlir] Refactor standalone-translate to use mlirTranslateMain()

[marbre]

Summary

This refactors the standalone-translate executable to use mlirTranslateMain() declared in Translation.h and further applies D87129.

[marbre]

[mlir] Refactor standalone-opt to use main() of helper

[jpienaar]

Thanks!

mlir/examples/standalone/standalone-translate/standalone-translate.cpp

 //===- standalone-translate.cpp ---------------------------------*- C++ -*-===//
 //
 // This file is licensed 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
 //
 //===----------------------------------------------------------------------===//
 //
 // This is a command line utility that translates a file from/to MLIR using one
 // of the registered translations.
 //
 //===----------------------------------------------------------------------===//
 
-#include "mlir/IR/AsmState.h"
-#include "mlir/IR/Diagnostics.h"
-#include "mlir/IR/MLIRContext.h"
-#include "mlir/InitAllDialects.h"
 #include "mlir/InitAllTranslations.h"
-#include "mlir/Support/FileUtilities.h"
 #include "mlir/Support/LogicalResult.h"
-#include "mlir/Support/ToolUtilities.h"
 #include "mlir/Translation.h"
-#include "llvm/Support/InitLLVM.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/SourceMgr.h"
-#include "llvm/Support/ToolOutputFile.h"
 
 #include "Standalone/StandaloneDialect.h"
 
-static llvm::cl::opt<std::string> inputFilename(llvm::cl::Positional,
-                                                llvm::cl::desc("<input file>"),
-                                                llvm::cl::init("-"));
-
-static llvm::cl::opt<std::string>
-    outputFilename("o", llvm::cl::desc("Output filename"),
-                   llvm::cl::value_desc("filename"), llvm::cl::init("-"));
-
-static llvm::cl::opt<bool>
-    splitInputFile("split-input-file",
-                   llvm::cl::desc("Split the input file into pieces and "
-                                  "process each chunk independently"),
-                   llvm::cl::init(false));
-
-static llvm::cl::opt<bool> verifyDiagnostics(
-    "verify-diagnostics",
-    llvm::cl::desc("Check that emitted diagnostics match "
-                   "expected-* lines on the corresponding line"),
-    llvm::cl::init(false));
-
 int main(int argc, char **argv) {
   mlir::registerAllTranslations();
 
   // TODO: Register standalone translations here.
 
-  llvm::InitLLVM y(argc, argv);
-
-  // Add flags for all the registered translations.
-  llvm::cl::opt<const mlir::TranslateFunction *, false, mlir::TranslationParser>
-      translationRequested("", llvm::cl::desc("Translation to perform"),
-                           llvm::cl::Required);
-  mlir::registerAsmPrinterCLOptions();
-  mlir::registerMLIRContextCLOptions();
-  llvm::cl::ParseCommandLineOptions(argc, argv, "MLIR translation driver\n");
-
-  std::string errorMessage;
-  auto input = mlir::openInputFile(inputFilename, &errorMessage);
-  if (!input) {
-    llvm::errs() << errorMessage << "\n";
-    return 1;
-  }
-
-  auto output = mlir::openOutputFile(outputFilename, &errorMessage);
-  if (!output) {
-    llvm::errs() << errorMessage << "\n";
-    return 1;
-  }
-
-  // Processes the memory buffer with a new MLIRContext.
-  auto processBuffer = [&](std::unique_ptr<llvm::MemoryBuffer> ownedBuffer,
-                           llvm::raw_ostream &os) {
-    mlir::MLIRContext context;
-    context.allowUnregisteredDialects();
-    context.printOpOnDiagnostic(!verifyDiagnostics);
-    llvm::SourceMgr sourceMgr;
-    sourceMgr.AddNewSourceBuffer(std::move(ownedBuffer), llvm::SMLoc());
-
-    if (!verifyDiagnostics) {
-      mlir::SourceMgrDiagnosticHandler sourceMgrHandler(sourceMgr, &context);
-      return (*translationRequested)(sourceMgr, os, &context);
-    }
-
-    // In the diagnostic verification flow, we ignore whether the translation
-    // failed (in most cases, it is expected to fail). Instead, we check if the
-    // diagnostics were produced as expected.
-    mlir::SourceMgrDiagnosticVerifierHandler sourceMgrHandler(sourceMgr,
-                                                              &context);
-    (*translationRequested)(sourceMgr, os, &context);
-    return sourceMgrHandler.verify();
-  };
-
-  if (splitInputFile) {
-    if (failed(mlir::splitAndProcessBuffer(std::move(input), processBuffer,
-                                           output->os())))
-      return 1;
-  } else {
-    if (failed(processBuffer(std::move(input), output->os())))
-      return 1;
-  }
-
-  output->keep();
-  return 0;
+  return failed(
+      mlir::mlirTranslateMain(argc, argv, "MLIR Translation Testing Tool"));
 }