Split out ArgsToFrontenfOptionsConverter.

Author: David Ungar

include/swift/Frontend/ArgsToFrontendOptionsConverter.h

@@ -0,0 +1,98 @@
+//===------ArgsToFrontendOptionsConverter.h-- --------------------*-C++ -*-===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SWIFT_FRONTEND_ARGSTOFRONTENDOPTIONSCONVERTER_H
+#define SWIFT_FRONTEND_ARGSTOFRONTENDOPTIONSCONVERTER_H
+
+#include "swift/AST/DiagnosticConsumer.h"
+#include "swift/AST/DiagnosticEngine.h"
+#include "swift/Frontend/FrontendOptions.h"
+#include "swift/Option/Options.h"
+#include "llvm/Option/ArgList.h"
+
+#include <vector>
+
+namespace swift {
+
+class ArgsToFrontendOptionsConverter {
+private:
+  DiagnosticEngine &Diags;
+  const llvm::opt::ArgList &Args;
+  FrontendOptions &Opts;
+
+  Optional<const std::vector<std::string>>
+      cachedOutputFilenamesFromCommandLineOrFilelist;
+
+  void handleDebugCrashGroupArguments();
+
+  void computeDebugTimeOptions();
+  bool computeFallbackModuleName();
+  bool computeModuleName();
+  bool computeOutputFilenames();
+  void computeDumpScopeMapLocations();
+  void computeHelpOptions();
+  void computeImplicitImportModuleNames();
+  void computeImportObjCHeaderOptions();
+  void computeLLVMArgs();
+  void computePlaygroundOptions();
+  void computePrintStatsOptions();
+  void computeTBDOptions();
+
+  void setUnsignedIntegerArgument(options::ID optionID, unsigned max,
+                                  unsigned &valueToSet);
+
+  FrontendOptions::ActionType determineRequestedAction() const;
+
+  bool setUpForSILOrLLVM();
+
+  /// Determine the correct output filename when none was specified.
+  ///
+  /// Such an absence should only occur when invoking the frontend
+  /// without the driver,
+  /// because the driver will always pass -o with an appropriate filename
+  /// if output is required for the requested action.
+  bool deriveOutputFilenameFromInputFile();
+
+  /// Determine the correct output filename when a directory was specified.
+  ///
+  /// Such a specification should only occur when invoking the frontend
+  /// directly, because the driver will always pass -o with an appropriate
+  /// filename if output is required for the requested action.
+  bool deriveOutputFilenameForDirectory(StringRef outputDir);
+
+  std::string determineBaseNameOfOutput() const;
+
+  void deriveOutputFilenameFromParts(StringRef dir, StringRef base);
+
+  void determineSupplementaryOutputFilenames();
+
+  /// Returns the output filenames on the command line or in the output
+  /// filelist. If there
+  /// were neither -o's nor an output filelist, returns an empty vector.
+  ArrayRef<std::string> getOutputFilenamesFromCommandLineOrFilelist();
+
+  bool checkForUnusedOutputPaths() const;
+
+  std::vector<std::string> readOutputFileList(StringRef filelistPath) const;
+
+public:
+  ArgsToFrontendOptionsConverter(DiagnosticEngine &Diags,
+                                 const llvm::opt::ArgList &Args,
+                                 FrontendOptions &Opts)
+      : Diags(Diags), Args(Args), Opts(Opts) {}
+
+  bool convert();
+};
+
+} // namespace swift
+
+#endif /* SWIFT_FRONTEND_ARGSTOFRONTENDOPTIONSCONVERTER_H */

include/swift/Frontend/FrontendOptions.h

@@ -30,7 +30,7 @@ namespace swift {
 
 /// Options for controlling the behavior of the frontend.
 class FrontendOptions {
-  friend class FrontendArgsToOptionsConverter;
+  friend class ArgsToFrontendOptionsConverter;
 
 public:
   FrontendInputs Inputs;