| //===--- ClangdMain.cpp - clangd server loop ------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ClangdLSPServer.h" |
| #include "Path.h" |
| #include "Trace.h" |
| #include "Transport.h" |
| #include "index/Serialization.h" |
| #include "clang/Basic/Version.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/FileSystem.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/Program.h" |
| #include "llvm/Support/Signals.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <cstdlib> |
| #include <iostream> |
| #include <memory> |
| #include <string> |
| #include <thread> |
| |
| using namespace llvm; |
| using namespace clang; |
| using namespace clang::clangd; |
| |
| // FIXME: remove this option when Dex is cheap enough. |
| static cl::opt<bool> UseDex("use-dex-index", |
| cl::desc("Use experimental Dex dynamic index."), |
| cl::init(false), cl::Hidden); |
| |
| static cl::opt<Path> CompileCommandsDir( |
| "compile-commands-dir", |
| cl::desc("Specify a path to look for compile_commands.json. If path " |
| "is invalid, clangd will look in the current directory and " |
| "parent paths of each source file.")); |
| |
| static cl::opt<unsigned> |
| WorkerThreadsCount("j", cl::desc("Number of async workers used by clangd"), |
| cl::init(getDefaultAsyncThreadsCount())); |
| |
| // FIXME: also support "plain" style where signatures are always omitted. |
| enum CompletionStyleFlag { Detailed, Bundled }; |
| static cl::opt<CompletionStyleFlag> CompletionStyle( |
| "completion-style", cl::desc("Granularity of code completion suggestions"), |
| cl::values( |
| clEnumValN(Detailed, "detailed", |
| "One completion item for each semantically distinct " |
| "completion, with full type information."), |
| clEnumValN(Bundled, "bundled", |
| "Similar completion items (e.g. function overloads) are " |
| "combined. Type information shown where possible.")), |
| cl::init(Detailed)); |
| |
| // FIXME: Flags are the wrong mechanism for user preferences. |
| // We should probably read a dotfile or similar. |
| static cl::opt<bool> IncludeIneligibleResults( |
| "include-ineligible-results", |
| cl::desc("Include ineligible completion results (e.g. private members)"), |
| cl::init(clangd::CodeCompleteOptions().IncludeIneligibleResults), |
| cl::Hidden); |
| |
| static cl::opt<JSONStreamStyle> InputStyle( |
| "input-style", cl::desc("Input JSON stream encoding"), |
| cl::values( |
| clEnumValN(JSONStreamStyle::Standard, "standard", "usual LSP protocol"), |
| clEnumValN(JSONStreamStyle::Delimited, "delimited", |
| "messages delimited by --- lines, with # comment support")), |
| cl::init(JSONStreamStyle::Standard)); |
| |
| static cl::opt<bool> PrettyPrint("pretty", cl::desc("Pretty-print JSON output"), |
| cl::init(false)); |
| |
| static cl::opt<Logger::Level> LogLevel( |
| "log", cl::desc("Verbosity of log messages written to stderr"), |
| cl::values(clEnumValN(Logger::Error, "error", "Error messages only"), |
| clEnumValN(Logger::Info, "info", "High level execution tracing"), |
| clEnumValN(Logger::Debug, "verbose", "Low level details")), |
| cl::init(Logger::Info)); |
| |
| static cl::opt<bool> |
| Test("lit-test", |
| cl::desc("Abbreviation for -input-style=delimited -pretty " |
| "-run-synchronously -enable-test-scheme. " |
| "Intended to simplify lit tests."), |
| cl::init(false), cl::Hidden); |
| |
| static cl::opt<bool> EnableTestScheme( |
| "enable-test-uri-scheme", |
| cl::desc("Enable 'test:' URI scheme. Only use in lit tests."), |
| cl::init(false), cl::Hidden); |
| |
| enum PCHStorageFlag { Disk, Memory }; |
| static cl::opt<PCHStorageFlag> PCHStorage( |
| "pch-storage", |
| cl::desc("Storing PCHs in memory increases memory usages, but may " |
| "improve performance"), |
| cl::values(clEnumValN(PCHStorageFlag::Disk, "disk", "store PCHs on disk"), |
| clEnumValN(PCHStorageFlag::Memory, "memory", |
| "store PCHs in memory")), |
| cl::init(PCHStorageFlag::Disk)); |
| |
| static cl::opt<int> |
| LimitResults("limit-results", |
| cl::desc("Limit the number of results returned by clangd. " |
| "0 means no limit."), |
| cl::init(100)); |
| |
| static cl::opt<bool> |
| RunSynchronously("run-synchronously", |
| cl::desc("Parse on main thread. If set, -j is ignored"), |
| cl::init(false), cl::Hidden); |
| |
| static cl::opt<Path> ResourceDir("resource-dir", |
| cl::desc("Directory for system clang headers"), |
| cl::init(""), cl::Hidden); |
| |
| static cl::opt<Path> InputMirrorFile( |
| "input-mirror-file", |
| cl::desc( |
| "Mirror all LSP input to the specified file. Useful for debugging."), |
| cl::init(""), cl::Hidden); |
| |
| static cl::opt<bool> EnableIndex( |
| "index", |
| cl::desc( |
| "Enable index-based features. By default, clangd maintains an index " |
| "built from symbols in opened files. Global index support needs to " |
| "enabled separatedly."), |
| cl::init(true), cl::Hidden); |
| |
| static cl::opt<bool> AllScopesCompletion( |
| "all-scopes-completion", |
| cl::desc( |
| "If set to true, code completion will include index symbols that are " |
| "not defined in the scopes (e.g. " |
| "namespaces) visible from the code completion point. Such completions " |
| "can insert scope qualifiers."), |
| cl::init(true)); |
| |
| static cl::opt<bool> |
| ShowOrigins("debug-origin", cl::desc("Show origins of completion items"), |
| cl::init(clangd::CodeCompleteOptions().ShowOrigins), |
| cl::Hidden); |
| |
| static cl::opt<bool> HeaderInsertionDecorators( |
| "header-insertion-decorators", |
| cl::desc("Prepend a circular dot or space before the completion " |
| "label, depending on whether " |
| "an include line will be inserted or not."), |
| cl::init(true)); |
| |
| static cl::opt<Path> IndexFile( |
| "index-file", |
| cl::desc( |
| "Index file to build the static index. The file must have been created " |
| "by a compatible clangd-index.\n" |
| "WARNING: This option is experimental only, and will be removed " |
| "eventually. Don't rely on it."), |
| cl::init(""), cl::Hidden); |
| |
| static cl::opt<bool> EnableBackgroundIndex( |
| "background-index", |
| cl::desc("Index project code in the background and persist index on disk. " |
| "Experimental"), |
| cl::init(false), cl::Hidden); |
| |
| enum CompileArgsFrom { LSPCompileArgs, FilesystemCompileArgs }; |
| static cl::opt<CompileArgsFrom> CompileArgsFrom( |
| "compile_args_from", cl::desc("The source of compile commands"), |
| cl::values(clEnumValN(LSPCompileArgs, "lsp", |
| "All compile commands come from LSP and " |
| "'compile_commands.json' files are ignored"), |
| clEnumValN(FilesystemCompileArgs, "filesystem", |
| "All compile commands come from the " |
| "'compile_commands.json' files")), |
| cl::init(FilesystemCompileArgs), cl::Hidden); |
| |
| static cl::opt<bool> EnableFunctionArgSnippets( |
| "function-arg-placeholders", |
| cl::desc("When disabled, completions contain only parentheses for " |
| "function calls. When enabled, completions also contain " |
| "placeholders for method parameters."), |
| cl::init(clangd::CodeCompleteOptions().EnableFunctionArgSnippets)); |
| |
| namespace { |
| |
| /// \brief Supports a test URI scheme with relaxed constraints for lit tests. |
| /// The path in a test URI will be combined with a platform-specific fake |
| /// directory to form an absolute path. For example, test:///a.cpp is resolved |
| /// C:\clangd-test\a.cpp on Windows and /clangd-test/a.cpp on Unix. |
| class TestScheme : public URIScheme { |
| public: |
| Expected<std::string> getAbsolutePath(StringRef /*Authority*/, StringRef Body, |
| StringRef /*HintPath*/) const override { |
| using namespace llvm::sys; |
| // Still require "/" in body to mimic file scheme, as we want lengths of an |
| // equivalent URI in both schemes to be the same. |
| if (!Body.startswith("/")) |
| return make_error<StringError>( |
| "Expect URI body to be an absolute path starting with '/': " + Body, |
| inconvertibleErrorCode()); |
| Body = Body.ltrim('/'); |
| SmallVector<char, 16> Path(Body.begin(), Body.end()); |
| path::native(Path); |
| auto Err = fs::make_absolute(TestScheme::TestDir, Path); |
| if (Err) |
| llvm_unreachable("Failed to make absolute path in test scheme."); |
| return std::string(Path.begin(), Path.end()); |
| } |
| |
| Expected<URI> uriFromAbsolutePath(StringRef AbsolutePath) const override { |
| StringRef Body = AbsolutePath; |
| if (!Body.consume_front(TestScheme::TestDir)) { |
| return make_error<StringError>("Path " + AbsolutePath + |
| " doesn't start with root " + TestDir, |
| inconvertibleErrorCode()); |
| } |
| |
| return URI("test", /*Authority=*/"", sys::path::convert_to_slash(Body)); |
| } |
| |
| private: |
| const static char TestDir[]; |
| }; |
| |
| #ifdef _WIN32 |
| const char TestScheme::TestDir[] = "C:\\clangd-test"; |
| #else |
| const char TestScheme::TestDir[] = "/clangd-test"; |
| #endif |
| |
| } |
| |
| int main(int argc, char *argv[]) { |
| sys::PrintStackTraceOnErrorSignal(argv[0]); |
| cl::SetVersionPrinter([](raw_ostream &OS) { |
| OS << clang::getClangToolFullVersion("clangd") << "\n"; |
| }); |
| cl::ParseCommandLineOptions( |
| argc, argv, |
| "clangd is a language server that provides IDE-like features to editors. " |
| "\n\nIt should be used via an editor plugin rather than invoked " |
| "directly. " |
| "For more information, see:" |
| "\n\thttps://clang.llvm.org/extra/clangd.html" |
| "\n\thttps://microsoft.github.io/language-server-protocol/"); |
| if (Test) { |
| RunSynchronously = true; |
| InputStyle = JSONStreamStyle::Delimited; |
| PrettyPrint = true; |
| preventThreadStarvationInTests(); // Ensure background index makes progress. |
| } |
| if (Test || EnableTestScheme) { |
| static URISchemeRegistry::Add<TestScheme> X( |
| "test", "Test scheme for clangd lit tests."); |
| } |
| |
| if (!RunSynchronously && WorkerThreadsCount == 0) { |
| errs() << "A number of worker threads cannot be 0. Did you mean to " |
| "specify -run-synchronously?"; |
| return 1; |
| } |
| |
| if (RunSynchronously) { |
| if (WorkerThreadsCount.getNumOccurrences()) |
| errs() << "Ignoring -j because -run-synchronously is set.\n"; |
| WorkerThreadsCount = 0; |
| } |
| |
| // Validate command line arguments. |
| Optional<raw_fd_ostream> InputMirrorStream; |
| if (!InputMirrorFile.empty()) { |
| std::error_code EC; |
| InputMirrorStream.emplace(InputMirrorFile, /*ref*/ EC, |
| sys::fs::FA_Read | sys::fs::FA_Write); |
| if (EC) { |
| InputMirrorStream.reset(); |
| errs() << "Error while opening an input mirror file: " << EC.message(); |
| } else { |
| InputMirrorStream->SetUnbuffered(); |
| } |
| } |
| |
| // Setup tracing facilities if CLANGD_TRACE is set. In practice enabling a |
| // trace flag in your editor's config is annoying, launching with |
| // `CLANGD_TRACE=trace.json vim` is easier. |
| Optional<raw_fd_ostream> TraceStream; |
| std::unique_ptr<trace::EventTracer> Tracer; |
| if (auto *TraceFile = getenv("CLANGD_TRACE")) { |
| std::error_code EC; |
| TraceStream.emplace(TraceFile, /*ref*/ EC, |
| sys::fs::FA_Read | sys::fs::FA_Write); |
| if (EC) { |
| TraceStream.reset(); |
| errs() << "Error while opening trace file " << TraceFile << ": " |
| << EC.message(); |
| } else { |
| Tracer = trace::createJSONTracer(*TraceStream, PrettyPrint); |
| } |
| } |
| |
| Optional<trace::Session> TracingSession; |
| if (Tracer) |
| TracingSession.emplace(*Tracer); |
| |
| // Use buffered stream to stderr (we still flush each log message). Unbuffered |
| // stream can cause significant (non-deterministic) latency for the logger. |
| errs().SetBuffered(); |
| StreamLogger Logger(errs(), LogLevel); |
| clangd::LoggingSession LoggingSession(Logger); |
| |
| // If --compile-commands-dir arg was invoked, check value and override default |
| // path. |
| Optional<Path> CompileCommandsDirPath; |
| if (!CompileCommandsDir.empty()) { |
| if (sys::fs::exists(CompileCommandsDir)) { |
| // We support passing both relative and absolute paths to the |
| // --compile-commands-dir argument, but we assume the path is absolute in |
| // the rest of clangd so we make sure the path is absolute before |
| // continuing. |
| SmallString<128> Path(CompileCommandsDir); |
| if (std::error_code EC = sys::fs::make_absolute(Path)) { |
| errs() << "Error while converting the relative path specified by " |
| "--compile-commands-dir to an absolute path: " |
| << EC.message() << ". The argument will be ignored.\n"; |
| } else { |
| CompileCommandsDirPath = Path.str(); |
| } |
| } else { |
| errs() << "Path specified by --compile-commands-dir does not exist. The " |
| "argument will be ignored.\n"; |
| } |
| } |
| |
| ClangdServer::Options Opts; |
| switch (PCHStorage) { |
| case PCHStorageFlag::Memory: |
| Opts.StorePreamblesInMemory = true; |
| break; |
| case PCHStorageFlag::Disk: |
| Opts.StorePreamblesInMemory = false; |
| break; |
| } |
| if (!ResourceDir.empty()) |
| Opts.ResourceDir = ResourceDir; |
| Opts.BuildDynamicSymbolIndex = EnableIndex; |
| Opts.HeavyweightDynamicSymbolIndex = UseDex; |
| Opts.BackgroundIndex = EnableBackgroundIndex; |
| std::unique_ptr<SymbolIndex> StaticIdx; |
| std::future<void> AsyncIndexLoad; // Block exit while loading the index. |
| if (EnableIndex && !IndexFile.empty()) { |
| // Load the index asynchronously. Meanwhile SwapIndex returns no results. |
| SwapIndex *Placeholder; |
| StaticIdx.reset(Placeholder = new SwapIndex(llvm::make_unique<MemIndex>())); |
| AsyncIndexLoad = runAsync<void>([Placeholder] { |
| if (auto Idx = loadIndex(IndexFile, /*UseDex=*/true)) |
| Placeholder->reset(std::move(Idx)); |
| }); |
| if (RunSynchronously) |
| AsyncIndexLoad.wait(); |
| } |
| Opts.StaticIndex = StaticIdx.get(); |
| Opts.AsyncThreadsCount = WorkerThreadsCount; |
| |
| clangd::CodeCompleteOptions CCOpts; |
| CCOpts.IncludeIneligibleResults = IncludeIneligibleResults; |
| CCOpts.Limit = LimitResults; |
| CCOpts.BundleOverloads = CompletionStyle != Detailed; |
| CCOpts.ShowOrigins = ShowOrigins; |
| if (!HeaderInsertionDecorators) { |
| CCOpts.IncludeIndicator.Insert.clear(); |
| CCOpts.IncludeIndicator.NoInsert.clear(); |
| } |
| CCOpts.SpeculativeIndexRequest = Opts.StaticIndex; |
| CCOpts.EnableFunctionArgSnippets = EnableFunctionArgSnippets; |
| CCOpts.AllScopes = AllScopesCompletion; |
| |
| // Initialize and run ClangdLSPServer. |
| // Change stdin to binary to not lose \r\n on windows. |
| sys::ChangeStdinToBinary(); |
| auto Transport = newJSONTransport( |
| stdin, outs(), |
| InputMirrorStream ? InputMirrorStream.getPointer() : nullptr, PrettyPrint, |
| InputStyle); |
| ClangdLSPServer LSPServer( |
| *Transport, CCOpts, CompileCommandsDirPath, |
| /*UseDirBasedCDB=*/CompileArgsFrom == FilesystemCompileArgs, Opts); |
| constexpr int NoShutdownRequestErrorCode = 1; |
| set_thread_name("clangd.main"); |
| return LSPServer.run() ? 0 : NoShutdownRequestErrorCode; |
| } |
