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 //===- DependencyScanningTool.h - clang-scan-deps service -----------------===//
 //
 // 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_DEPENDENCYSCANNINGTOOL_H
 #define LLVM_CLANG_TOOLING_DEPENDENCYSCANNING_DEPENDENCYSCANNINGTOOL_H
 
 #include "clang/Tooling/DependencyScanning/DependencyScanningService.h"
 #include "clang/Tooling/DependencyScanning/DependencyScanningWorker.h"
 #include "clang/Tooling/DependencyScanning/ModuleDepCollector.h"
 #include "clang/Tooling/JSONCompilationDatabase.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/MapVector.h"
 #include <functional>
 #include <optional>
 #include <string>
 #include <vector>
 
 namespace clang {
 namespace tooling {
 namespace dependencies {
 
 /// A callback to lookup module outputs for "-fmodule-file=", "-o" etc.
 using LookupModuleOutputCallback =
     std::function<std::string(const ModuleID &, ModuleOutputKind)>;
 
 /// Graph of modular dependencies.
 using ModuleDepsGraph = std::vector<ModuleDeps>;
 
 /// The full dependencies and module graph for a specific input.
 struct TranslationUnitDeps {
   /// The graph of direct and transitive modular dependencies.
   ModuleDepsGraph ModuleGraph;
 
   /// The identifier of the C++20 module this translation unit exports.
   ///
   /// If the translation unit is not a module then \c ID.ModuleName is empty.
   ModuleID ID;
 
   /// A collection of absolute paths to files that this translation unit
   /// directly depends on, not including transitive dependencies.
   std::vector<std::string> FileDeps;
 
   /// A collection of prebuilt modules this translation unit directly depends
   /// on, not including transitive dependencies.
   std::vector<PrebuiltModuleDep> PrebuiltModuleDeps;
 
   /// A list of modules this translation unit directly depends on, not including
   /// transitive dependencies.
   ///
   /// This may include modules with a different context hash when it can be
   /// determined that the differences are benign for this compilation.
   std::vector<ModuleID> ClangModuleDeps;
 
   /// The sequence of commands required to build the translation unit. Commands
   /// should be executed in order.
   ///
   /// FIXME: If we add support for multi-arch builds in clang-scan-deps, we
   /// should make the dependencies between commands explicit to enable parallel
   /// builds of each architecture.
   std::vector<Command> Commands;
 
   /// Deprecated driver command-line. This will be removed in a future version.
   std::vector<std::string> DriverCommandLine;
 };
 
 struct P1689Rule {
   std::string PrimaryOutput;
   std::optional<P1689ModuleInfo> Provides;
   std::vector<P1689ModuleInfo> Requires;
 };
 
 /// The high-level implementation of the dependency discovery tool that runs on
 /// an individual worker thread.
 class DependencyScanningTool {
 public:
   /// Construct a dependency scanning tool.
   DependencyScanningTool(DependencyScanningService &Service,
                          llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS =
                              llvm::vfs::createPhysicalFileSystem());
 
   /// Print out the dependency information into a string using the dependency
   /// file format that is specified in the options (-MD is the default) and
   /// return it.
   ///
   /// \returns A \c StringError with the diagnostic output if clang errors
   /// occurred, dependency file contents otherwise.
   llvm::Expected<std::string>
   getDependencyFile(const std::vector<std::string> &CommandLine, StringRef CWD);
 
   /// Collect the module dependency in P1689 format for C++20 named modules.
   ///
   /// \param MakeformatOutput The output parameter for dependency information
   /// in make format if the command line requires to generate make-format
   /// dependency information by `-MD -MF <dep_file>`.
   ///
   /// \param MakeformatOutputPath The output parameter for the path to
   /// \param MakeformatOutput.
   ///
   /// \returns A \c StringError with the diagnostic output if clang errors
   /// occurred, P1689 dependency format rules otherwise.
   llvm::Expected<P1689Rule>
   getP1689ModuleDependencyFile(const clang::tooling::CompileCommand &Command,
                                StringRef CWD, std::string &MakeformatOutput,
                                std::string &MakeformatOutputPath);
   llvm::Expected<P1689Rule>
   getP1689ModuleDependencyFile(const clang::tooling::CompileCommand &Command,
                                StringRef CWD) {
     std::string MakeformatOutput;
     std::string MakeformatOutputPath;
 
     return getP1689ModuleDependencyFile(Command, CWD, MakeformatOutput,
                                         MakeformatOutputPath);
   }
 
   /// Given a Clang driver command-line for a translation unit, gather the
   /// modular dependencies and return the information needed for explicit build.
   ///
   /// \param AlreadySeen This stores modules which have previously been
   ///                    reported. Use the same instance for all calls to this
   ///                    function for a single \c DependencyScanningTool in a
   ///                    single build. Use a different one for different tools,
   ///                    and clear it between builds.
   /// \param LookupModuleOutput This function is called to fill in
   ///                           "-fmodule-file=", "-o" and other output
   ///                           arguments for dependencies.
   ///
   /// \returns a \c StringError with the diagnostic output if clang errors
   /// occurred, \c TranslationUnitDeps otherwise.
   llvm::Expected<TranslationUnitDeps>
   getTranslationUnitDependencies(const std::vector<std::string> &CommandLine,
                                  StringRef CWD,
                                  const llvm::DenseSet<ModuleID> &AlreadySeen,
                                  LookupModuleOutputCallback LookupModuleOutput);
 
   /// Given a compilation context specified via the Clang driver command-line,
   /// gather modular dependencies of module with the given name, and return the
   /// information needed for explicit build.
   llvm::Expected<ModuleDepsGraph> getModuleDependencies(
       StringRef ModuleName, const std::vector<std::string> &CommandLine,
       StringRef CWD, const llvm::DenseSet<ModuleID> &AlreadySeen,
       LookupModuleOutputCallback LookupModuleOutput);
 
   llvm::vfs::FileSystem &getWorkerVFS() const { return Worker.getVFS(); }
 
 private:
   DependencyScanningWorker Worker;
 };
 
 class FullDependencyConsumer : public DependencyConsumer {
 public:
   FullDependencyConsumer(const llvm::DenseSet<ModuleID> &AlreadySeen)
       : AlreadySeen(AlreadySeen) {}
 
   void handleBuildCommand(Command Cmd) override {
     Commands.push_back(std::move(Cmd));
   }
 
   void handleDependencyOutputOpts(const DependencyOutputOptions &) override {}
 
   void handleFileDependency(StringRef File) override {
     Dependencies.push_back(std::string(File));
   }
 
   void handlePrebuiltModuleDependency(PrebuiltModuleDep PMD) override {
     PrebuiltModuleDeps.emplace_back(std::move(PMD));
   }
 
   void handleModuleDependency(ModuleDeps MD) override {
     ClangModuleDeps[MD.ID] = std::move(MD);
   }
 
   void handleDirectModuleDependency(ModuleID ID) override {
     DirectModuleDeps.push_back(ID);
   }
 
   void handleContextHash(std::string Hash) override {
     ContextHash = std::move(Hash);
   }
 
   TranslationUnitDeps takeTranslationUnitDeps();
   ModuleDepsGraph takeModuleGraphDeps();
 
 private:
   std::vector<std::string> Dependencies;
   std::vector<PrebuiltModuleDep> PrebuiltModuleDeps;
   llvm::MapVector<ModuleID, ModuleDeps> ClangModuleDeps;
   std::vector<ModuleID> DirectModuleDeps;
   std::vector<Command> Commands;
   std::string ContextHash;
   std::vector<std::string> OutputPaths;
   const llvm::DenseSet<ModuleID> &AlreadySeen;
 };
 
 /// A simple dependency action controller that uses a callback. If no callback
 /// is provided, it is assumed that looking up module outputs is unreachable.
 class CallbackActionController : public DependencyActionController {
 public:
   virtual ~CallbackActionController();
 
   CallbackActionController(LookupModuleOutputCallback LMO)
       : LookupModuleOutput(std::move(LMO)) {
     if (!LookupModuleOutput) {
       LookupModuleOutput = [](const ModuleID &,
                               ModuleOutputKind) -> std::string {
         llvm::report_fatal_error("unexpected call to lookupModuleOutput");
       };
     }
   }
 
   std::string lookupModuleOutput(const ModuleID &ID,
                                  ModuleOutputKind Kind) override {
     return LookupModuleOutput(ID, Kind);
   }
 
 private:
   LookupModuleOutputCallback LookupModuleOutput;
 };
 
 } // end namespace dependencies
 } // end namespace tooling
 } // end namespace clang
 
 #endif // LLVM_CLANG_TOOLING_DEPENDENCYSCANNING_DEPENDENCYSCANNINGTOOL_H

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