| //===-- ClangDocMain.cpp - ClangDoc -----------------------------*- 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This tool for generating C and C++ documenation from source code |
| // and comments. Generally, it runs a LibTooling FrontendAction on source files, |
| // mapping each declaration in those files to its USR and serializing relevant |
| // information into LLVM bitcode. It then runs a pass over the collected |
| // declaration information, reducing by USR. There is an option to dump this |
| // intermediate result to bitcode. Finally, it hands the reduced information |
| // off to a generator, which does the final parsing from the intermediate |
| // representation to the desired output format. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "BitcodeReader.h" |
| #include "BitcodeWriter.h" |
| #include "ClangDoc.h" |
| #include "Generators.h" |
| #include "Representation.h" |
| #include "clang/AST/AST.h" |
| #include "clang/AST/Decl.h" |
| #include "clang/ASTMatchers/ASTMatchFinder.h" |
| #include "clang/ASTMatchers/ASTMatchersInternal.h" |
| #include "clang/Driver/Options.h" |
| #include "clang/Frontend/FrontendActions.h" |
| #include "clang/Tooling/CommonOptionsParser.h" |
| #include "clang/Tooling/Execution.h" |
| #include "clang/Tooling/Tooling.h" |
| #include "llvm/ADT/APFloat.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/Error.h" |
| #include "llvm/Support/FileSystem.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/Process.h" |
| #include "llvm/Support/Signals.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <string> |
| |
| using namespace clang::ast_matchers; |
| using namespace clang::tooling; |
| using namespace clang; |
| |
| static llvm::cl::extrahelp CommonHelp(CommonOptionsParser::HelpMessage); |
| static llvm::cl::OptionCategory ClangDocCategory("clang-doc options"); |
| |
| static llvm::cl::opt<bool> IgnoreMappingFailures( |
| "ignore-map-errors", |
| llvm::cl::desc("Continue if files are not mapped correctly."), |
| llvm::cl::init(true), llvm::cl::cat(ClangDocCategory)); |
| |
| static llvm::cl::opt<std::string> |
| OutDirectory("output", |
| llvm::cl::desc("Directory for outputting generated files."), |
| llvm::cl::init("docs"), llvm::cl::cat(ClangDocCategory)); |
| |
| static llvm::cl::opt<bool> |
| PublicOnly("public", llvm::cl::desc("Document only public declarations."), |
| llvm::cl::init(false), llvm::cl::cat(ClangDocCategory)); |
| |
| static llvm::cl::opt<bool> DoxygenOnly( |
| "doxygen", |
| llvm::cl::desc("Use only doxygen-style comments to generate docs."), |
| llvm::cl::init(false), llvm::cl::cat(ClangDocCategory)); |
| |
| static llvm::cl::list<std::string> UserStylesheets( |
| "stylesheets", llvm::cl::CommaSeparated, |
| llvm::cl::desc("CSS stylesheets to extend the default styles."), |
| llvm::cl::cat(ClangDocCategory)); |
| |
| enum OutputFormatTy { |
| md, |
| yaml, |
| html, |
| }; |
| |
| static llvm::cl::opt<OutputFormatTy> |
| FormatEnum("format", llvm::cl::desc("Format for outputted docs."), |
| llvm::cl::values(clEnumValN(OutputFormatTy::yaml, "yaml", |
| "Documentation in YAML format."), |
| clEnumValN(OutputFormatTy::md, "md", |
| "Documentation in MD format."), |
| clEnumValN(OutputFormatTy::html, "html", |
| "Documentation in HTML format.")), |
| llvm::cl::init(OutputFormatTy::yaml), |
| llvm::cl::cat(ClangDocCategory)); |
| |
| std::string getFormatString() { |
| switch (FormatEnum) { |
| case OutputFormatTy::yaml: |
| return "yaml"; |
| case OutputFormatTy::md: |
| return "md"; |
| case OutputFormatTy::html: |
| return "html"; |
| } |
| llvm_unreachable("Unknown OutputFormatTy"); |
| } |
| |
| // This function isn't referenced outside its translation unit, but it |
| // can't use the "static" keyword because its address is used for |
| // GetMainExecutable (since some platforms don't support taking the |
| // address of main, and some platforms can't implement GetMainExecutable |
| // without being given the address of a function in the main executable). |
| std::string GetExecutablePath(const char *Argv0, void *MainAddr) { |
| return llvm::sys::fs::getMainExecutable(Argv0, MainAddr); |
| } |
| |
| bool CreateDirectory(const Twine &DirName, bool ClearDirectory = false) { |
| std::error_code OK; |
| llvm::SmallString<128> DocsRootPath; |
| if (ClearDirectory) { |
| std::error_code RemoveStatus = llvm::sys::fs::remove_directories(DirName); |
| if (RemoveStatus != OK) { |
| llvm::errs() << "Unable to remove existing documentation directory for " |
| << DirName << ".\n"; |
| return true; |
| } |
| } |
| std::error_code DirectoryStatus = llvm::sys::fs::create_directories(DirName); |
| if (DirectoryStatus != OK) { |
| llvm::errs() << "Unable to create documentation directories.\n"; |
| return true; |
| } |
| return false; |
| } |
| |
| // A function to extract the appropriate file name for a given info's |
| // documentation. The path returned is a composite of the output directory, the |
| // info's relative path and name and the extension. The relative path should |
| // have been constructed in the serialization phase. |
| // |
| // Example: Given the below, the <ext> path for class C will be |
| // <root>/A/B/C.<ext> |
| // |
| // namespace A { |
| // namesapce B { |
| // |
| // class C {}; |
| // |
| // } |
| // } |
| llvm::Expected<llvm::SmallString<128>> getInfoOutputFile(StringRef Root, |
| StringRef RelativePath, |
| StringRef Name, |
| StringRef Ext) { |
| llvm::SmallString<128> Path; |
| llvm::sys::path::native(Root, Path); |
| llvm::sys::path::append(Path, RelativePath); |
| if (CreateDirectory(Path)) |
| return llvm::make_error<llvm::StringError>("Unable to create directory.\n", |
| llvm::inconvertibleErrorCode()); |
| llvm::sys::path::append(Path, Name + Ext); |
| return Path; |
| } |
| |
| // Iterate through tool results and build string map of info vectors from the |
| // encoded bitstreams. |
| bool bitcodeResultsToInfos( |
| tooling::ToolResults &Results, |
| llvm::StringMap<std::vector<std::unique_ptr<doc::Info>>> &Output) { |
| bool Err = false; |
| Results.forEachResult([&](StringRef Key, StringRef Value) { |
| llvm::BitstreamCursor Stream(Value); |
| doc::ClangDocBitcodeReader Reader(Stream); |
| auto Infos = Reader.readBitcode(); |
| if (!Infos) { |
| llvm::errs() << toString(Infos.takeError()) << "\n"; |
| Err = true; |
| return; |
| } |
| for (auto &I : Infos.get()) { |
| auto R = |
| Output.try_emplace(Key, std::vector<std::unique_ptr<doc::Info>>()); |
| R.first->second.emplace_back(std::move(I)); |
| } |
| }); |
| return Err; |
| } |
| |
| int main(int argc, const char **argv) { |
| llvm::sys::PrintStackTraceOnErrorSignal(argv[0]); |
| std::error_code OK; |
| |
| ExecutorName.setInitialValue("all-TUs"); |
| auto Exec = clang::tooling::createExecutorFromCommandLineArgs( |
| argc, argv, ClangDocCategory); |
| |
| if (!Exec) { |
| llvm::errs() << toString(Exec.takeError()) << "\n"; |
| return 1; |
| } |
| |
| // Fail early if an invalid format was provided. |
| std::string Format = getFormatString(); |
| llvm::outs() << "Emiting docs in " << Format << " format.\n"; |
| auto G = doc::findGeneratorByName(Format); |
| if (!G) { |
| llvm::errs() << toString(G.takeError()) << "\n"; |
| return 1; |
| } |
| |
| ArgumentsAdjuster ArgAdjuster; |
| if (!DoxygenOnly) |
| ArgAdjuster = combineAdjusters( |
| getInsertArgumentAdjuster("-fparse-all-comments", |
| tooling::ArgumentInsertPosition::END), |
| ArgAdjuster); |
| |
| clang::doc::ClangDocContext CDCtx = { |
| Exec->get()->getExecutionContext(), |
| PublicOnly, |
| OutDirectory, |
| {UserStylesheets.begin(), UserStylesheets.end()}}; |
| |
| if (Format == "html") { |
| void *MainAddr = (void *)(intptr_t)GetExecutablePath; |
| std::string ClangDocPath = GetExecutablePath(argv[0], MainAddr); |
| llvm::SmallString<128> DefaultStylesheet; |
| llvm::sys::path::native(ClangDocPath, DefaultStylesheet); |
| DefaultStylesheet = llvm::sys::path::parent_path(DefaultStylesheet); |
| llvm::sys::path::append(DefaultStylesheet, |
| "../share/clang/clang-doc-default-stylesheet.css"); |
| CDCtx.UserStylesheets.insert(CDCtx.UserStylesheets.begin(), |
| DefaultStylesheet.str()); |
| } |
| |
| // Mapping phase |
| llvm::outs() << "Mapping decls...\n"; |
| auto Err = |
| Exec->get()->execute(doc::newMapperActionFactory(CDCtx), ArgAdjuster); |
| if (Err) { |
| if (IgnoreMappingFailures) |
| llvm::errs() << "Error mapping decls in files. Clang-doc will ignore " |
| "these files and continue:\n" |
| << toString(std::move(Err)) << "\n"; |
| else { |
| llvm::errs() << toString(std::move(Err)) << "\n"; |
| return 1; |
| } |
| } |
| |
| // Collect values into output by key. |
| // In ToolResults, the Key is the hashed USR and the value is the |
| // bitcode-encoded representation of the Info object. |
| llvm::outs() << "Collecting infos...\n"; |
| llvm::StringMap<std::vector<std::unique_ptr<doc::Info>>> USRToInfos; |
| if (bitcodeResultsToInfos(*Exec->get()->getToolResults(), USRToInfos)) |
| return 1; |
| |
| // First reducing phase (reduce all decls into one info per decl). |
| llvm::outs() << "Reducing " << USRToInfos.size() << " infos...\n"; |
| for (auto &Group : USRToInfos) { |
| auto Reduced = doc::mergeInfos(Group.getValue()); |
| if (!Reduced) { |
| llvm::errs() << llvm::toString(Reduced.takeError()); |
| continue; |
| } |
| |
| doc::Info *I = Reduced.get().get(); |
| auto InfoPath = getInfoOutputFile(OutDirectory, I->Path, I->extractName(), |
| "." + Format); |
| if (!InfoPath) { |
| llvm::errs() << toString(InfoPath.takeError()) << "\n"; |
| return 1; |
| } |
| std::error_code FileErr; |
| llvm::raw_fd_ostream InfoOS(InfoPath.get(), FileErr, llvm::sys::fs::F_None); |
| if (FileErr != OK) { |
| llvm::errs() << "Error opening info file: " << FileErr.message() << "\n"; |
| continue; |
| } |
| |
| if (auto Err = G->get()->generateDocForInfo(I, InfoOS, CDCtx)) |
| llvm::errs() << toString(std::move(Err)) << "\n"; |
| } |
| |
| if (!G->get()->createResources(CDCtx)) |
| return 1; |
| |
| return 0; |
| } |