DependencyScanningWorker.h

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//===- DependencyScanningWorker.h - clang-scan-deps worker ===---*- 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
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CLANG_TOOLING_DEPENDENCYSCANNING_DEPENDENCYSCANNINGWORKER_H
#define LLVM_CLANG_TOOLING_DEPENDENCYSCANNING_DEPENDENCYSCANNINGWORKER_H
 
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/LLVM.h"
#include "clang/Frontend/PCHContainerOperations.h"
#include "clang/Lex/PreprocessorExcludedConditionalDirectiveSkipMapping.h"
#include "clang/Tooling/DependencyScanning/DependencyScanningService.h"
#include "clang/Tooling/DependencyScanning/ModuleDepCollector.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/FileSystem.h"
#include <string>
 
namespace clang {
 
class DependencyOutputOptions;
 
namespace tooling {
namespace dependencies {
 
class DependencyScanningWorkerFilesystem;
 
class DependencyConsumer {
public:
  virtual ~DependencyConsumer() {}
 
  virtual void
  handleDependencyOutputOpts(const DependencyOutputOptions &Opts) = 0;
 
  virtual void handleFileDependency(StringRef Filename) = 0;
 
  virtual void handlePrebuiltModuleDependency(PrebuiltModuleDep PMD) = 0;
 
  virtual void handleModuleDependency(ModuleDeps MD) = 0;
 
  virtual void handleContextHash(std::string Hash) = 0;
};
 
/// An individual dependency scanning worker that is able to run on its own
/// thread.
///
/// The worker computes the dependencies for the input files by preprocessing
/// sources either using a fast mode where the source files are minimized, or
/// using the regular processing run.
class DependencyScanningWorker {
public:
  DependencyScanningWorker(DependencyScanningService &Service);
 
  /// Run the dependency scanning tool for a given clang driver command-line,
  /// and report the discovered dependencies to the provided consumer. If \p
  /// ModuleName isn't empty, this function reports the dependencies of module
  /// \p ModuleName.
  ///
  /// \returns A \c StringError with the diagnostic output if clang errors
  /// occurred, success otherwise.
  llvm::Error computeDependencies(StringRef WorkingDirectory,
                                  const std::vector<std::string> &CommandLine,
                                  DependencyConsumer &Consumer,
                                  llvm::Optional<StringRef> ModuleName = None);
 
private:
  std::shared_ptr<PCHContainerOperations> PCHContainerOps;
  ExcludedPreprocessorDirectiveSkipMapping PPSkipMappings;
 
  /// The physical filesystem overlaid by `InMemoryFS`.
  llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> RealFS;
  /// The in-memory filesystem laid on top the physical filesystem in `RealFS`.
  llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFS;
  /// The file system that is used by each worker when scanning for
  /// dependencies. This filesystem persists across multiple compiler
  /// invocations.
  llvm::IntrusiveRefCntPtr<DependencyScanningWorkerFilesystem> DepFS;
  /// The file manager that is reused across multiple invocations by this
  /// worker. If null, the file manager will not be reused.
  llvm::IntrusiveRefCntPtr<FileManager> Files;
  ScanningOutputFormat Format;
  /// Whether to optimize the modules' command-line arguments.
  bool OptimizeArgs;
};
 
} // end namespace dependencies
} // end namespace tooling
} // end namespace clang
 
#endif // LLVM_CLANG_TOOLING_DEPENDENCYSCANNING_DEPENDENCYSCANNINGWORKER_H