[Batch mode] Move various Frontend pieces into dedicated files.

include/swift/Frontend/ArgsToFrontendInputsConverter.h

@@ -0,0 +1,76 @@
+//===--- ArgsToFrontendInputsConverter.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_ARGSTOFRONTENDINPUTSCONVERTER_H
+#define SWIFT_FRONTEND_ARGSTOFRONTENDINPUTSCONVERTER_H
+
+#include "swift/AST/DiagnosticConsumer.h"
+#include "swift/AST/DiagnosticEngine.h"
+#include "swift/Frontend/FrontendOptions.h"
+#include "llvm/Option/ArgList.h"
+
+namespace swift {
+
+/// Implement argument semantics in a way that will make it easier to have
+/// >1 primary file (or even a primary file list) in the future without
+/// breaking anything today.
+///
+/// Semantics today:
+/// If input files are on command line, primary files on command line are also
+/// input files; they are not repeated without -primary-file. If input files are
+/// in a file list, the primary files on the command line are repeated in the
+/// file list. Thus, if there are any primary files, it is illegal to have both
+/// (non-primary) input files and a file list. Finally, the order of input files
+/// must match the order given on the command line or the file list.
+///
+/// Side note:
+/// since each input file will cause a lot of work for the compiler, this code
+/// is biased towards clarity and not optimized.
+/// In the near future, it will be possible to put primary files in the
+/// filelist, or to have a separate filelist for primaries. The organization
+/// here anticipates that evolution.
+
+class ArgsToFrontendInputsConverter {
+  DiagnosticEngine &Diags;
+  const llvm::opt::ArgList &Args;
+  FrontendInputs &Inputs;
+
+  llvm::opt::Arg const *const FilelistPathArg;
+  llvm::opt::Arg const *const PrimaryFilelistPathArg;
+
+  SmallVector<std::unique_ptr<llvm::MemoryBuffer>, 4> BuffersToKeepAlive;
+
+  llvm::SetVector<StringRef> Files;
+
+public:
+  ArgsToFrontendInputsConverter(DiagnosticEngine &diags,
+                                const llvm::opt::ArgList &args,
+                                FrontendInputs &inputs);
+
+  bool convert();
+
+private:
+  bool enforceFilelistExclusion();
+  bool readInputFilesFromCommandLine();
+  bool readInputFilesFromFilelist();
+  bool forAllFilesInFilelist(llvm::opt::Arg const *const pathArg,
+                             llvm::function_ref<void(StringRef)> fn);
+  bool addFile(StringRef file);
+  Optional<std::set<StringRef>> readPrimaryFiles();
+  std::set<StringRef>
+  createInputFilesConsumingPrimaries(std::set<StringRef> primaryFiles);
+  bool checkForMissingPrimaryFiles(std::set<StringRef> primaryFiles);
+};
+
+} // namespace swift
+
+#endif /* SWIFT_FRONTEND_ARGSTOFRONTENDINPUTSCONVERTER_H */

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/FrontendInputs.h

@@ -0,0 +1,127 @@
+//===--- FrontendInputs.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_FRONTENDINPUTS_H
+#define SWIFT_FRONTEND_FRONTENDINPUTS_H
+
+#include "swift/AST/Module.h"
+#include "swift/Frontend/FrontendInputs.h"
+#include "swift/Frontend/InputFile.h"
+#include "llvm/ADT/Hashing.h"
+#include "llvm/ADT/MapVector.h"
+
+#include <string>
+#include <vector>
+
+namespace llvm {
+class MemoryBuffer;
+}
+
+namespace swift {
+
+/// Information about all the inputs to the frontend.
+class FrontendInputs {
+  friend class ArgsToFrontendInputsConverter;
+
+  std::vector<InputFile> AllFiles;
+  typedef llvm::StringMap<unsigned> InputFileMap;
+  InputFileMap PrimaryInputs;
+
+public:
+  FrontendInputs() = default;
+
+  FrontendInputs(const FrontendInputs &other);
+
+  FrontendInputs &operator=(const FrontendInputs &other);
+
+  // Readers:
+
+  ArrayRef<InputFile> getAllFiles() const { return AllFiles; }
+
+  std::vector<std::string> getInputFilenames() const;
+
+  unsigned inputCount() const { return getAllFiles().size(); }
+
+  bool hasInputs() const { return !AllFiles.empty(); }
+
+  bool hasSingleInput() const { return inputCount() == 1; }
+
+  StringRef getFilenameOfFirstInput() const;
+
+  bool isReadingFromStdin() const;
+
+  // If we have exactly one input filename, and its extension is "bc" or "ll",
+  // treat the input as LLVM_IR.
+  bool shouldTreatAsLLVM() const;
+
+  // Primary input readers
+
+private:
+  void assertMustNotBeMoreThanOnePrimaryInput() const;
+
+  bool areAllNonPrimariesSIB() const;
+
+public:
+  unsigned primaryInputCount() const { return PrimaryInputs.size(); }
+
+  // Primary count readers:
+
+  bool hasUniquePrimaryInput() const { return primaryInputCount() == 1; }
+
+  bool hasPrimaryInputs() const { return primaryInputCount() > 0; }
+
+  bool isWholeModule() const { return !hasPrimaryInputs(); }
+
+  // Count-dependend readers:
+
+  /// \return the unique primary input, if one exists.
+  const InputFile *getUniquePrimaryInput() const;
+
+  const InputFile &getRequiredUniquePrimaryInput() const;
+
+  /// \return the name of the unique primary input, or an empty StrinRef if
+  /// there isn't one.
+  StringRef getNameOfUniquePrimaryInputFile() const;
+
+  bool isFilePrimary(StringRef file) const;
+
+  unsigned numberOfPrimaryInputsEndingWith(const char *extension) const;
+
+  // Multi-facet readers
+
+  bool shouldTreatAsSIL() const;
+
+  /// \return true for error
+  bool verifyInputs(DiagnosticEngine &diags, bool treatAsSIL,
+                    bool isREPLRequested, bool isNoneRequested) const;
+
+  // Writers
+
+  void addInputFile(StringRef file, llvm::MemoryBuffer *buffer = nullptr) {
+    addInput(InputFile(file, false, buffer));
+  }
+  void addPrimaryInputFile(StringRef file,
+                           llvm::MemoryBuffer *buffer = nullptr) {
+    addInput(InputFile(file, true, buffer));
+  }
+
+  void addInput(const InputFile &input);
+
+  void clearInputs() {
+    AllFiles.clear();
+    PrimaryInputs.clear();
+  }
+};
+
+} // namespace swift
+
+#endif /* SWIFT_FRONTEND_FRONTENDINPUTS_H */