lib/Frontend/FrontendInputsAndOutputs.cpp - third_party/swift - Git at Google

 //===--- FrontendInputsAndOutputs.cpp -------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//

 #include "swift/Frontend/FrontendInputsAndOutputs.h"

 #include "swift/AST/DiagnosticsFrontend.h"
 #include "swift/Basic/PrimarySpecificPaths.h"
 #include "swift/Frontend/FrontendOptions.h"
 #include "swift/Option/Options.h"
 #include "swift/Parse/Lexer.h"
 #include "swift/Strings.h"
 #include "llvm/Option/Arg.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Option/Option.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/LineIterator.h"
 #include "llvm/Support/Path.h"

 using namespace swift;
 using namespace llvm::opt;

 // Constructors

 FrontendInputsAndOutputs::FrontendInputsAndOutputs(
     const FrontendInputsAndOutputs &other) {
   for (InputFile input : other.AllInputs)
     addInput(input);
   IsSingleThreadedWMO = other.IsSingleThreadedWMO;
 }

 FrontendInputsAndOutputs &FrontendInputsAndOutputs::
 operator=(const FrontendInputsAndOutputs &other) {
   clearInputs();
   for (InputFile input : other.AllInputs)
     addInput(input);
   IsSingleThreadedWMO = other.IsSingleThreadedWMO;
   return *this;
 }

 // All inputs:

 std::vector<std::string> FrontendInputsAndOutputs::getInputFilenames() const {
   std::vector<std::string> filenames;
   for (auto &input : AllInputs) {
     filenames.push_back(input.file());
   }
   return filenames;
 }

 bool FrontendInputsAndOutputs::isReadingFromStdin() const {
   return hasSingleInput() && getFilenameOfFirstInput() == "-";
 }

 const std::string &FrontendInputsAndOutputs::getFilenameOfFirstInput() const {
   assert(hasInputs());
   const InputFile &inp = AllInputs[0];
   const std::string &f = inp.file();
   assert(!f.empty());
   return f;
 }

 bool FrontendInputsAndOutputs::forEachInput(
     llvm::function_ref<bool(const InputFile &)> fn) const {
   for (const InputFile &input : AllInputs)
     if (fn(input))
       return true;
   return false;
 }

 // Primaries:

 const InputFile &FrontendInputsAndOutputs::firstPrimaryInput() const {
   assert(!PrimaryInputsInOrder.empty());
   return AllInputs[PrimaryInputsInOrder.front()];
 }

 const InputFile &FrontendInputsAndOutputs::lastPrimaryInput() const {
   assert(!PrimaryInputsInOrder.empty());
   return AllInputs[PrimaryInputsInOrder.back()];
 }

 bool FrontendInputsAndOutputs::forEachPrimaryInput(
     llvm::function_ref<bool(const InputFile &)> fn) const {
   for (unsigned i : PrimaryInputsInOrder)
     if (fn(AllInputs[i]))
       return true;
   return false;
 }

 void FrontendInputsAndOutputs::assertMustNotBeMoreThanOnePrimaryInput() const {
   assert(!hasMultiplePrimaryInputs() &&
          "have not implemented >1 primary input yet");
 }

 void FrontendInputsAndOutputs::
     assertMustNotBeMoreThanOnePrimaryInputUnlessBatchModeChecksHaveBeenBypassed()
         const {
   if (!areBatchModeChecksBypassed())
     assertMustNotBeMoreThanOnePrimaryInput();
 }

 const InputFile *FrontendInputsAndOutputs::getUniquePrimaryInput() const {
   assertMustNotBeMoreThanOnePrimaryInput();
   return PrimaryInputsInOrder.empty()
              ? nullptr
              : &AllInputs[PrimaryInputsInOrder.front()];
 }

 const InputFile &
 FrontendInputsAndOutputs::getRequiredUniquePrimaryInput() const {
   if (const auto *input = getUniquePrimaryInput())
     return *input;
   llvm_unreachable("No primary when one is required");
 }

 std::string FrontendInputsAndOutputs::getStatsFileMangledInputName() const {
   // FIXME: "batch" should probably be some concatenation of all the primary
   // input names, in order to keep the stats file names unique. (Or perhaps just
   // the first primary?)
   return isWholeModule()
              ? "all"
              : primaryInputCount() == 1 ? firstPrimaryInput().file() : "batch";
 }

 bool FrontendInputsAndOutputs::isInputPrimary(StringRef file) const {
   return primaryInputNamed(file) != nullptr;
 }

 unsigned FrontendInputsAndOutputs::numberOfPrimaryInputsEndingWith(
     const char *extension) const {
   unsigned n = 0;
   (void)forEachPrimaryInput([&](const InputFile &input) -> bool {
     if (llvm::sys::path::extension(input.file()).endswith(extension))
       ++n;
     return false;
   });
   return n;
 }

 // Input queries

 bool FrontendInputsAndOutputs::shouldTreatAsLLVM() const {
   if (hasSingleInput()) {
     StringRef Input(getFilenameOfFirstInput());
     return llvm::sys::path::extension(Input).endswith(LLVM_BC_EXTENSION) ||
            llvm::sys::path::extension(Input).endswith(LLVM_IR_EXTENSION);
   }
   return false;
 }

 bool FrontendInputsAndOutputs::shouldTreatAsSIL() const {
   if (hasSingleInput()) {
     // If we have exactly one input filename, and its extension is "sil",
     // treat the input as SIL.
     const std::string &Input(getFilenameOfFirstInput());
     return llvm::sys::path::extension(Input).endswith(SIL_EXTENSION);
   }
   // If we have one primary input and it's a filename with extension "sil",
   // treat the input as SIL.
   unsigned silPrimaryCount = numberOfPrimaryInputsEndingWith(SIL_EXTENSION);
   if (silPrimaryCount == 0)
     return false;
   if (silPrimaryCount == primaryInputCount()) {
     // Not clear what to do someday with multiple primaries
     assertMustNotBeMoreThanOnePrimaryInput();
     return true;
   }
   llvm_unreachable("Either all primaries or none must end with .sil");
 }

 bool FrontendInputsAndOutputs::areAllNonPrimariesSIB() const {
   for (const InputFile &input : AllInputs) {
     if (input.isPrimary())
       continue;
     if (!llvm::sys::path::extension(input.file()).endswith(SIB_EXTENSION)) {
       return false;
     }
   }
   return true;
 }

 bool FrontendInputsAndOutputs::verifyInputs(DiagnosticEngine &diags,
                                             bool treatAsSIL,
                                             bool isREPLRequested,
                                             bool isNoneRequested) const {
   if (isREPLRequested) {
     if (hasInputs()) {
       diags.diagnose(SourceLoc(), diag::error_repl_requires_no_input_files);
       return true;
     }
   } else if (treatAsSIL) {
     if (isWholeModule()) {
       if (inputCount() != 1) {
         diags.diagnose(SourceLoc(), diag::error_mode_requires_one_input_file);
         return true;
       }
     } else {
       assertMustNotBeMoreThanOnePrimaryInput();
       // If we have the SIL as our primary input, we can waive the one file
       // requirement as long as all the other inputs are SIBs.
       if (!areAllNonPrimariesSIB()) {
         diags.diagnose(SourceLoc(),
                        diag::error_mode_requires_one_sil_multi_sib);
         return true;
       }
     }
   } else if (!isNoneRequested && !hasInputs()) {
     diags.diagnose(SourceLoc(), diag::error_mode_requires_an_input_file);
     return true;
   }
   return false;
 }

 // Changing inputs

 void FrontendInputsAndOutputs::clearInputs() {
   AllInputs.clear();
   PrimaryInputsByName.clear();
   PrimaryInputsInOrder.clear();
 }

 void FrontendInputsAndOutputs::addInput(const InputFile &input) {
   const unsigned index = AllInputs.size();
   AllInputs.push_back(input);
   if (input.isPrimary()) {
     PrimaryInputsInOrder.push_back(index);
     PrimaryInputsByName.insert(std::make_pair(AllInputs.back().file(), index));
   }
 }

 void FrontendInputsAndOutputs::addInputFile(StringRef file,
                                             llvm::MemoryBuffer *buffer) {
   addInput(InputFile(file, false, buffer));
 }

 void FrontendInputsAndOutputs::addPrimaryInputFile(StringRef file,
                                                    llvm::MemoryBuffer *buffer) {
   addInput(InputFile(file, true, buffer));
 }

 // Outputs

 unsigned FrontendInputsAndOutputs::countOfInputsProducingMainOutputs() const {
   return isSingleThreadedWMO()
              ? 1
              : hasPrimaryInputs() ? primaryInputCount() : inputCount();
 }

 const InputFile &FrontendInputsAndOutputs::firstInputProducingOutput() const {
   return isSingleThreadedWMO()
              ? firstInput()
              : hasPrimaryInputs() ? firstPrimaryInput() : firstInput();
 }

 const InputFile &FrontendInputsAndOutputs::lastInputProducingOutput() const {
   return isSingleThreadedWMO()
              ? firstInput()
              : hasPrimaryInputs() ? lastPrimaryInput() : lastInput();
 }

 bool FrontendInputsAndOutputs::forEachInputProducingAMainOutputFile(
     llvm::function_ref<bool(const InputFile &)> fn) const {
   return isSingleThreadedWMO()
              ? fn(firstInput())
              : hasPrimaryInputs() ? forEachPrimaryInput(fn) : forEachInput(fn);
 }

 void FrontendInputsAndOutputs::setMainAndSupplementaryOutputs(
     ArrayRef<std::string> outputFiles,
     ArrayRef<SupplementaryOutputPaths> supplementaryOutputs) {
   if (AllInputs.empty()) {
     assert(outputFiles.empty() && "Cannot have outputs without inputs");
     assert(supplementaryOutputs.empty() &&
            "Cannot have supplementary outputs without inputs");
     return;
   }
   if (hasPrimaryInputs()) {
     const auto N = primaryInputCount();
     assert(outputFiles.size() == N && "Must have one main output per primary");
     assert(supplementaryOutputs.size() == N &&
            "Must have one set of supplementary outputs per primary");

     unsigned i = 0;
     for (auto &input : AllInputs) {
       if (input.isPrimary()) {
         input.setPrimarySpecificPaths(PrimarySpecificPaths(
             outputFiles[i], input.file(), supplementaryOutputs[i]));
         ++i;
       }
     }
     return;
   }
   assert(supplementaryOutputs.size() == 1 &&
          "WMO only ever produces one set of supplementary outputs");
   if (outputFiles.size() == 1) {
     AllInputs.front().setPrimarySpecificPaths(PrimarySpecificPaths(
         outputFiles.front(), firstInputProducingOutput().file(),
         supplementaryOutputs.front()));
     return;
   }
   assert(outputFiles.size() == AllInputs.size() &&
          "Multi-threaded WMO requires one main output per input");
   for (auto i : indices(AllInputs))
     AllInputs[i].setPrimarySpecificPaths(PrimarySpecificPaths(
         outputFiles[i], outputFiles[i],
         i == 0 ? supplementaryOutputs.front() : SupplementaryOutputPaths()));
 }

 std::vector<std::string> FrontendInputsAndOutputs::copyOutputFilenames() const {
   std::vector<std::string> outputs;
   (void)forEachInputProducingAMainOutputFile(
       [&](const InputFile &input) -> bool {
         outputs.push_back(input.outputFilename());
         return false;
       });
   return outputs;
 }

 void FrontendInputsAndOutputs::forEachOutputFilename(
     llvm::function_ref<void(StringRef)> fn) const {
   (void)forEachInputProducingAMainOutputFile(
       [&](const InputFile &input) -> bool {
         fn(input.outputFilename());
         return false;
       });
 }

 std::string FrontendInputsAndOutputs::getSingleOutputFilename() const {
   assertMustNotBeMoreThanOnePrimaryInputUnlessBatchModeChecksHaveBeenBypassed();
   return hasInputs() ? lastInputProducingOutput().outputFilename()
                      : std::string();
 }

 bool FrontendInputsAndOutputs::isOutputFilenameStdout() const {
   return getSingleOutputFilename() == "-";
 }

 bool FrontendInputsAndOutputs::isOutputFileDirectory() const {
   return hasNamedOutputFile() &&
          llvm::sys::fs::is_directory(getSingleOutputFilename());
 }

 bool FrontendInputsAndOutputs::hasNamedOutputFile() const {
   return hasInputs() && !isOutputFilenameStdout();
 }

 // Supplementary outputs

 unsigned
 FrontendInputsAndOutputs::countOfFilesProducingSupplementaryOutput() const {
   return hasPrimaryInputs() ? primaryInputCount() : hasInputs() ? 1 : 0;
 }

 bool FrontendInputsAndOutputs::forEachInputProducingSupplementaryOutput(
     llvm::function_ref<bool(const InputFile &)> fn) const {
   return hasPrimaryInputs() ? forEachPrimaryInput(fn)
                             : hasInputs() ? fn(firstInput()) : false;
 }

 bool FrontendInputsAndOutputs::hasSupplementaryOutputPath(
     llvm::function_ref<const std::string &(const SupplementaryOutputPaths &)>
         extractorFn) const {
   return forEachInputProducingSupplementaryOutput([&](const InputFile &input)
                                                       -> bool {
     return !extractorFn(input.getPrimarySpecificPaths().SupplementaryOutputs)
                 .empty();
   });
 }

 bool FrontendInputsAndOutputs::hasDependenciesPath() const {
   return hasSupplementaryOutputPath(
       [](const SupplementaryOutputPaths &outs) -> const std::string & {
         return outs.DependenciesFilePath;
       });
 }
 bool FrontendInputsAndOutputs::hasReferenceDependenciesPath() const {
   return hasSupplementaryOutputPath(
       [](const SupplementaryOutputPaths &outs) -> const std::string & {
         return outs.ReferenceDependenciesFilePath;
       });
 }
 bool FrontendInputsAndOutputs::hasObjCHeaderOutputPath() const {
   return hasSupplementaryOutputPath(
       [](const SupplementaryOutputPaths &outs) -> const std::string & {
         return outs.ObjCHeaderOutputPath;
       });
 }
 bool FrontendInputsAndOutputs::hasLoadedModuleTracePath() const {
   return hasSupplementaryOutputPath(
       [](const SupplementaryOutputPaths &outs) -> const std::string & {
         return outs.LoadedModuleTracePath;
       });
 }
 bool FrontendInputsAndOutputs::hasModuleOutputPath() const {
   return hasSupplementaryOutputPath(
       [](const SupplementaryOutputPaths &outs) -> const std::string & {
         return outs.ModuleOutputPath;
       });
 }
 bool FrontendInputsAndOutputs::hasModuleDocOutputPath() const {
   return hasSupplementaryOutputPath(
       [](const SupplementaryOutputPaths &outs) -> const std::string & {
         return outs.ModuleDocOutputPath;
       });
 }
 bool FrontendInputsAndOutputs::hasTBDPath() const {
   return hasSupplementaryOutputPath(
       [](const SupplementaryOutputPaths &outs) -> const std::string & {
         return outs.TBDPath;
       });
 }

 bool FrontendInputsAndOutputs::hasDependencyTrackerPath() const {
   return hasDependenciesPath() || hasReferenceDependenciesPath() ||
          hasLoadedModuleTracePath();
 }

 const PrimarySpecificPaths &
 FrontendInputsAndOutputs::getPrimarySpecificPathsForAtMostOnePrimary() const {
   assertMustNotBeMoreThanOnePrimaryInputUnlessBatchModeChecksHaveBeenBypassed();
   static auto emptyPaths = PrimarySpecificPaths();
   return hasInputs() ? firstInputProducingOutput().getPrimarySpecificPaths()
                      : emptyPaths;
 }

 const PrimarySpecificPaths &
 FrontendInputsAndOutputs::getPrimarySpecificPathsForPrimary(
     StringRef filename) const {
   const InputFile *f = primaryInputNamed(filename);
   return f->getPrimarySpecificPaths();
 }

 const InputFile *
 FrontendInputsAndOutputs::primaryInputNamed(StringRef name) const {
   assert(!name.empty() && "input files have names");
   StringRef correctedFile =
       InputFile::convertBufferNameFromLLVM_getFileOrSTDIN_toSwiftConventions(
           name);
   auto iterator = PrimaryInputsByName.find(correctedFile);
   if (iterator == PrimaryInputsByName.end())
     return nullptr;
   const InputFile *f = &AllInputs[iterator->second];
   assert(f->isPrimary() && "PrimaryInputsByName should only include primries");
   return f;
 }
	//===--- FrontendInputsAndOutputs.cpp -------------------------------------===//
	//
	// 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
	//
	//===----------------------------------------------------------------------===//

	#include "swift/Frontend/FrontendInputsAndOutputs.h"

	#include "swift/AST/DiagnosticsFrontend.h"
	#include "swift/Basic/PrimarySpecificPaths.h"
	#include "swift/Frontend/FrontendOptions.h"
	#include "swift/Option/Options.h"
	#include "swift/Parse/Lexer.h"
	#include "swift/Strings.h"
	#include "llvm/Option/Arg.h"
	#include "llvm/Option/ArgList.h"
	#include "llvm/Option/Option.h"
	#include "llvm/Support/ErrorHandling.h"
	#include "llvm/Support/FileSystem.h"
	#include "llvm/Support/LineIterator.h"
	#include "llvm/Support/Path.h"

	using namespace swift;
	using namespace llvm::opt;

	// Constructors

	FrontendInputsAndOutputs::FrontendInputsAndOutputs(
	const FrontendInputsAndOutputs &other) {
	for (InputFile input : other.AllInputs)
	addInput(input);
	IsSingleThreadedWMO = other.IsSingleThreadedWMO;
	}

	FrontendInputsAndOutputs &FrontendInputsAndOutputs::
	operator=(const FrontendInputsAndOutputs &other) {
	clearInputs();
	for (InputFile input : other.AllInputs)
	addInput(input);
	IsSingleThreadedWMO = other.IsSingleThreadedWMO;
	return *this;
	}

	// All inputs:

	std::vector<std::string> FrontendInputsAndOutputs::getInputFilenames() const {
	std::vector<std::string> filenames;
	for (auto &input : AllInputs) {
	filenames.push_back(input.file());
	}
	return filenames;
	}

	bool FrontendInputsAndOutputs::isReadingFromStdin() const {
	return hasSingleInput() && getFilenameOfFirstInput() == "-";
	}

	const std::string &FrontendInputsAndOutputs::getFilenameOfFirstInput() const {
	assert(hasInputs());
	const InputFile &inp = AllInputs[0];
	const std::string &f = inp.file();
	assert(!f.empty());
	return f;
	}

	bool FrontendInputsAndOutputs::forEachInput(
	llvm::function_ref<bool(const InputFile &)> fn) const {
	for (const InputFile &input : AllInputs)
	if (fn(input))
	return true;
	return false;
	}

	// Primaries:

	const InputFile &FrontendInputsAndOutputs::firstPrimaryInput() const {
	assert(!PrimaryInputsInOrder.empty());
	return AllInputs[PrimaryInputsInOrder.front()];
	}

	const InputFile &FrontendInputsAndOutputs::lastPrimaryInput() const {
	assert(!PrimaryInputsInOrder.empty());
	return AllInputs[PrimaryInputsInOrder.back()];
	}

	bool FrontendInputsAndOutputs::forEachPrimaryInput(
	llvm::function_ref<bool(const InputFile &)> fn) const {
	for (unsigned i : PrimaryInputsInOrder)
	if (fn(AllInputs[i]))
	return true;
	return false;
	}

	void FrontendInputsAndOutputs::assertMustNotBeMoreThanOnePrimaryInput() const {
	assert(!hasMultiplePrimaryInputs() &&
	"have not implemented >1 primary input yet");
	}

	void FrontendInputsAndOutputs::
	assertMustNotBeMoreThanOnePrimaryInputUnlessBatchModeChecksHaveBeenBypassed()
	const {
	if (!areBatchModeChecksBypassed())
	assertMustNotBeMoreThanOnePrimaryInput();
	}

	const InputFile *FrontendInputsAndOutputs::getUniquePrimaryInput() const {
	assertMustNotBeMoreThanOnePrimaryInput();
	return PrimaryInputsInOrder.empty()
	? nullptr
	: &AllInputs[PrimaryInputsInOrder.front()];
	}

	const InputFile &
	FrontendInputsAndOutputs::getRequiredUniquePrimaryInput() const {
	if (const auto *input = getUniquePrimaryInput())
	return *input;
	llvm_unreachable("No primary when one is required");
	}

	std::string FrontendInputsAndOutputs::getStatsFileMangledInputName() const {
	// FIXME: "batch" should probably be some concatenation of all the primary
	// input names, in order to keep the stats file names unique. (Or perhaps just
	// the first primary?)
	return isWholeModule()
	? "all"
	: primaryInputCount() == 1 ? firstPrimaryInput().file() : "batch";
	}

	bool FrontendInputsAndOutputs::isInputPrimary(StringRef file) const {
	return primaryInputNamed(file) != nullptr;
	}

	unsigned FrontendInputsAndOutputs::numberOfPrimaryInputsEndingWith(
	const char *extension) const {
	unsigned n = 0;
	(void)forEachPrimaryInput([&](const InputFile &input) -> bool {
	if (llvm::sys::path::extension(input.file()).endswith(extension))
	++n;
	return false;
	});
	return n;
	}

	// Input queries

	bool FrontendInputsAndOutputs::shouldTreatAsLLVM() const {
	if (hasSingleInput()) {
	StringRef Input(getFilenameOfFirstInput());
	return llvm::sys::path::extension(Input).endswith(LLVM_BC_EXTENSION) \|\|
	llvm::sys::path::extension(Input).endswith(LLVM_IR_EXTENSION);
	}
	return false;
	}

	bool FrontendInputsAndOutputs::shouldTreatAsSIL() const {
	if (hasSingleInput()) {
	// If we have exactly one input filename, and its extension is "sil",
	// treat the input as SIL.
	const std::string &Input(getFilenameOfFirstInput());
	return llvm::sys::path::extension(Input).endswith(SIL_EXTENSION);
	}
	// If we have one primary input and it's a filename with extension "sil",
	// treat the input as SIL.
	unsigned silPrimaryCount = numberOfPrimaryInputsEndingWith(SIL_EXTENSION);
	if (silPrimaryCount == 0)
	return false;
	if (silPrimaryCount == primaryInputCount()) {
	// Not clear what to do someday with multiple primaries
	assertMustNotBeMoreThanOnePrimaryInput();
	return true;
	}
	llvm_unreachable("Either all primaries or none must end with .sil");
	}

	bool FrontendInputsAndOutputs::areAllNonPrimariesSIB() const {
	for (const InputFile &input : AllInputs) {
	if (input.isPrimary())
	continue;
	if (!llvm::sys::path::extension(input.file()).endswith(SIB_EXTENSION)) {
	return false;
	}
	}
	return true;
	}

	bool FrontendInputsAndOutputs::verifyInputs(DiagnosticEngine &diags,
	bool treatAsSIL,
	bool isREPLRequested,
	bool isNoneRequested) const {
	if (isREPLRequested) {
	if (hasInputs()) {
	diags.diagnose(SourceLoc(), diag::error_repl_requires_no_input_files);
	return true;
	}
	} else if (treatAsSIL) {
	if (isWholeModule()) {
	if (inputCount() != 1) {
	diags.diagnose(SourceLoc(), diag::error_mode_requires_one_input_file);
	return true;
	}
	} else {
	assertMustNotBeMoreThanOnePrimaryInput();
	// If we have the SIL as our primary input, we can waive the one file
	// requirement as long as all the other inputs are SIBs.
	if (!areAllNonPrimariesSIB()) {
	diags.diagnose(SourceLoc(),
	diag::error_mode_requires_one_sil_multi_sib);
	return true;
	}
	}
	} else if (!isNoneRequested && !hasInputs()) {
	diags.diagnose(SourceLoc(), diag::error_mode_requires_an_input_file);
	return true;
	}
	return false;
	}

	// Changing inputs

	void FrontendInputsAndOutputs::clearInputs() {
	AllInputs.clear();
	PrimaryInputsByName.clear();
	PrimaryInputsInOrder.clear();
	}

	void FrontendInputsAndOutputs::addInput(const InputFile &input) {
	const unsigned index = AllInputs.size();
	AllInputs.push_back(input);
	if (input.isPrimary()) {
	PrimaryInputsInOrder.push_back(index);
	PrimaryInputsByName.insert(std::make_pair(AllInputs.back().file(), index));
	}
	}

	void FrontendInputsAndOutputs::addInputFile(StringRef file,
	llvm::MemoryBuffer *buffer) {
	addInput(InputFile(file, false, buffer));
	}

	void FrontendInputsAndOutputs::addPrimaryInputFile(StringRef file,
	llvm::MemoryBuffer *buffer) {
	addInput(InputFile(file, true, buffer));
	}

	// Outputs

	unsigned FrontendInputsAndOutputs::countOfInputsProducingMainOutputs() const {
	return isSingleThreadedWMO()
	? 1
	: hasPrimaryInputs() ? primaryInputCount() : inputCount();
	}

	const InputFile &FrontendInputsAndOutputs::firstInputProducingOutput() const {
	return isSingleThreadedWMO()
	? firstInput()
	: hasPrimaryInputs() ? firstPrimaryInput() : firstInput();
	}

	const InputFile &FrontendInputsAndOutputs::lastInputProducingOutput() const {
	return isSingleThreadedWMO()
	? firstInput()
	: hasPrimaryInputs() ? lastPrimaryInput() : lastInput();
	}

	bool FrontendInputsAndOutputs::forEachInputProducingAMainOutputFile(
	llvm::function_ref<bool(const InputFile &)> fn) const {
	return isSingleThreadedWMO()
	? fn(firstInput())
	: hasPrimaryInputs() ? forEachPrimaryInput(fn) : forEachInput(fn);
	}

	void FrontendInputsAndOutputs::setMainAndSupplementaryOutputs(
	ArrayRef<std::string> outputFiles,
	ArrayRef<SupplementaryOutputPaths> supplementaryOutputs) {
	if (AllInputs.empty()) {
	assert(outputFiles.empty() && "Cannot have outputs without inputs");
	assert(supplementaryOutputs.empty() &&
	"Cannot have supplementary outputs without inputs");
	return;
	}
	if (hasPrimaryInputs()) {
	const auto N = primaryInputCount();
	assert(outputFiles.size() == N && "Must have one main output per primary");
	assert(supplementaryOutputs.size() == N &&
	"Must have one set of supplementary outputs per primary");

	unsigned i = 0;
	for (auto &input : AllInputs) {
	if (input.isPrimary()) {
	input.setPrimarySpecificPaths(PrimarySpecificPaths(
	outputFiles[i], input.file(), supplementaryOutputs[i]));
	++i;
	}
	}
	return;
	}
	assert(supplementaryOutputs.size() == 1 &&
	"WMO only ever produces one set of supplementary outputs");
	if (outputFiles.size() == 1) {
	AllInputs.front().setPrimarySpecificPaths(PrimarySpecificPaths(
	outputFiles.front(), firstInputProducingOutput().file(),
	supplementaryOutputs.front()));
	return;
	}
	assert(outputFiles.size() == AllInputs.size() &&
	"Multi-threaded WMO requires one main output per input");
	for (auto i : indices(AllInputs))
	AllInputs[i].setPrimarySpecificPaths(PrimarySpecificPaths(
	outputFiles[i], outputFiles[i],
	i == 0 ? supplementaryOutputs.front() : SupplementaryOutputPaths()));
	}

	std::vector<std::string> FrontendInputsAndOutputs::copyOutputFilenames() const {
	std::vector<std::string> outputs;
	(void)forEachInputProducingAMainOutputFile(
	[&](const InputFile &input) -> bool {
	outputs.push_back(input.outputFilename());
	return false;
	});
	return outputs;
	}

	void FrontendInputsAndOutputs::forEachOutputFilename(
	llvm::function_ref<void(StringRef)> fn) const {
	(void)forEachInputProducingAMainOutputFile(
	[&](const InputFile &input) -> bool {
	fn(input.outputFilename());
	return false;
	});
	}

	std::string FrontendInputsAndOutputs::getSingleOutputFilename() const {
	assertMustNotBeMoreThanOnePrimaryInputUnlessBatchModeChecksHaveBeenBypassed();
	return hasInputs() ? lastInputProducingOutput().outputFilename()
	: std::string();
	}

	bool FrontendInputsAndOutputs::isOutputFilenameStdout() const {
	return getSingleOutputFilename() == "-";
	}

	bool FrontendInputsAndOutputs::isOutputFileDirectory() const {
	return hasNamedOutputFile() &&
	llvm::sys::fs::is_directory(getSingleOutputFilename());
	}

	bool FrontendInputsAndOutputs::hasNamedOutputFile() const {
	return hasInputs() && !isOutputFilenameStdout();
	}

	// Supplementary outputs

	unsigned
	FrontendInputsAndOutputs::countOfFilesProducingSupplementaryOutput() const {
	return hasPrimaryInputs() ? primaryInputCount() : hasInputs() ? 1 : 0;
	}

	bool FrontendInputsAndOutputs::forEachInputProducingSupplementaryOutput(
	llvm::function_ref<bool(const InputFile &)> fn) const {
	return hasPrimaryInputs() ? forEachPrimaryInput(fn)
	: hasInputs() ? fn(firstInput()) : false;
	}

	bool FrontendInputsAndOutputs::hasSupplementaryOutputPath(
	llvm::function_ref<const std::string &(const SupplementaryOutputPaths &)>
	extractorFn) const {
	return forEachInputProducingSupplementaryOutput([&](const InputFile &input)
	-> bool {
	return !extractorFn(input.getPrimarySpecificPaths().SupplementaryOutputs)
	.empty();
	});
	}

	bool FrontendInputsAndOutputs::hasDependenciesPath() const {
	return hasSupplementaryOutputPath(
	[](const SupplementaryOutputPaths &outs) -> const std::string & {
	return outs.DependenciesFilePath;
	});
	}
	bool FrontendInputsAndOutputs::hasReferenceDependenciesPath() const {
	return hasSupplementaryOutputPath(
	[](const SupplementaryOutputPaths &outs) -> const std::string & {
	return outs.ReferenceDependenciesFilePath;
	});
	}
	bool FrontendInputsAndOutputs::hasObjCHeaderOutputPath() const {
	return hasSupplementaryOutputPath(
	[](const SupplementaryOutputPaths &outs) -> const std::string & {
	return outs.ObjCHeaderOutputPath;
	});
	}
	bool FrontendInputsAndOutputs::hasLoadedModuleTracePath() const {
	return hasSupplementaryOutputPath(
	[](const SupplementaryOutputPaths &outs) -> const std::string & {
	return outs.LoadedModuleTracePath;
	});
	}
	bool FrontendInputsAndOutputs::hasModuleOutputPath() const {
	return hasSupplementaryOutputPath(
	[](const SupplementaryOutputPaths &outs) -> const std::string & {
	return outs.ModuleOutputPath;
	});
	}
	bool FrontendInputsAndOutputs::hasModuleDocOutputPath() const {
	return hasSupplementaryOutputPath(
	[](const SupplementaryOutputPaths &outs) -> const std::string & {
	return outs.ModuleDocOutputPath;
	});
	}
	bool FrontendInputsAndOutputs::hasTBDPath() const {
	return hasSupplementaryOutputPath(
	[](const SupplementaryOutputPaths &outs) -> const std::string & {
	return outs.TBDPath;
	});
	}

	bool FrontendInputsAndOutputs::hasDependencyTrackerPath() const {
	return hasDependenciesPath() \|\| hasReferenceDependenciesPath() \|\|
	hasLoadedModuleTracePath();
	}

	const PrimarySpecificPaths &
	FrontendInputsAndOutputs::getPrimarySpecificPathsForAtMostOnePrimary() const {
	assertMustNotBeMoreThanOnePrimaryInputUnlessBatchModeChecksHaveBeenBypassed();
	static auto emptyPaths = PrimarySpecificPaths();
	return hasInputs() ? firstInputProducingOutput().getPrimarySpecificPaths()
	: emptyPaths;
	}

	const PrimarySpecificPaths &
	FrontendInputsAndOutputs::getPrimarySpecificPathsForPrimary(
	StringRef filename) const {
	const InputFile *f = primaryInputNamed(filename);
	return f->getPrimarySpecificPaths();
	}

	const InputFile *
	FrontendInputsAndOutputs::primaryInputNamed(StringRef name) const {
	assert(!name.empty() && "input files have names");
	StringRef correctedFile =
	InputFile::convertBufferNameFromLLVM_getFileOrSTDIN_toSwiftConventions(
	name);
	auto iterator = PrimaryInputsByName.find(correctedFile);
	if (iterator == PrimaryInputsByName.end())
	return nullptr;
	const InputFile *f = &AllInputs[iterator->second];
	assert(f->isPrimary() && "PrimaryInputsByName should only include primries");
	return f;
	}