[clangd] Extract options struct for ClangdLSPServer. NFC

[sammccall]

Summary

In preparation for making moving TweakFilter from ClangdServer::Options to
a ClangdLSPServer option, and letting it vary per-request.
(In order to implement CodeActionParams.only)

Also a general overdue cleanup.

[sammccall]

clang-tools-extra/clangd/ClangdLSPServer.h

39

One question here is whether the inheritance is too tricky.

The nice thing about it is that Opts.CrossFileRename = true is pretty natural at the configuration site, where Opts.ServerOpts.CrossFileRename isn't.

[sammccall]

Drop redundant 'opts' from member names of per-feature opts structs

[kbobyrev]

LGTM, thanks!

clang-tools-extra/clangd/ClangdLSPServer.h

56

nit: Maybe move this to the tests? I'm not sure if this would be useful in the public interface.

[ro]

This patch broke builds with gcc, e.g. Builder clang-solaris11-amd64 Build #6724:

[23/122] Building CXX object tools/clang/tools/extra/clangd/tool/CMakeFiles/clangd.dir/ClangdMain.cpp.o
FAILED: tools/clang/tools/extra/clangd/tool/CMakeFiles/clangd.dir/ClangdMain.cpp.o 
/usr/gcc/9/bin/c++  -DGTEST_HAS_RTTI=0 -D_DEBUG -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Itools/clang/tools/extra/clangd/tool -I/opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool -Itools/clang/tools/extra/clangd/../clang-tidy -I/opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang/include -Itools/clang/include -Iinclude -I/opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/llvm/include -I/opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/llvm/include/llvm/Support/Solaris -I/opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/.. -Itools/clang/tools/extra/clangd/tool/.. -Itools/clang/tools/extra/clangd -fPIC -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -fno-strict-aliasing -O3     -fno-exceptions -fno-rtti -UNDEBUG -std=c++14 -MD -MT tools/clang/tools/extra/clangd/tool/CMakeFiles/clangd.dir/ClangdMain.cpp.o -MF tools/clang/tools/extra/clangd/tool/CMakeFiles/clangd.dir/ClangdMain.cpp.o.d -o tools/clang/tools/extra/clangd/tool/CMakeFiles/clangd.dir/ClangdMain.cpp.o -c /opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/ClangdMain.cpp
In file included from /opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/ClangdMain.cpp:9:
/opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/../ClangdLSPServer.h:47:36: error: declaration of ‘llvm::Optional<clang::clangd::OffsetEncoding> clang::clangd::ClangdLSPServer::Options::OffsetEncoding’ changes meaning of ‘OffsetEncoding’ [-fpermissive]
   47 |     llvm::Optional<OffsetEncoding> OffsetEncoding;
      |                                    ^~~~~~~~~~~~~~
In file included from /opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/../Headers.h:12,
                 from /opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/../CodeComplete.h:19,
                 from /opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/../ClangdServer.h:13,
                 from /opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/../ClangdLSPServer.h:12,
                 from /opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/ClangdMain.cpp:9:
/opt/llvm-buildbot/home/solaris11-amd64/clang-solaris11-amd64/llvm/clang-tools-extra/clangd/tool/../Protocol.h:370:12: note: ‘OffsetEncoding’ declared here as ‘enum class clang::clangd::OffsetEncoding’
  370 | enum class OffsetEncoding {
      |            ^~~~~~~~~~~~~~

[sammccall]

Yes, sorry about that. It has been fixed
in 6342b38c5fee74df94d7b0c34e5a93b9b22763df.

clang-tools-extra/clangd/ClangdLSPServer.h

 
 /// This class exposes ClangdServer's capabilities via Language Server Protocol.
 ///
 /// MessageHandler binds the implemented LSP methods (e.g. onInitialize) to
 /// corresponding JSON-RPC methods ("initialize").
 /// The server also supports $/cancelRequest (MessageHandler provides this).
 class ClangdLSPServer : private ClangdServer::Callbacks {
 public:
-  /// If \p CompileCommandsDir has a value, compile_commands.json will be
-  /// loaded only from \p CompileCommandsDir. Otherwise, clangd will look
-  /// for compile_commands.json in all parent directories of each file.
-  /// If UseDirBasedCDB is false, compile commands are not read from disk.
-  // FIXME: Clean up signature around CDBs.
+  struct Options : ClangdServer::Options {
+    /// Look for compilation databases, rather than using compile commands
+    /// set via LSP (extensions) only.
+    bool UseDirBasedCDB = true;
+    /// A fixed directory to search for a compilation database in.
+    /// If not set, we search upward from the source file.
+    llvm::Optional<Path> CompileCommandsDir;
+    /// The offset-encoding to use, or None to negotiate it over LSP.
+    llvm::Optional<OffsetEncoding> OffsetEncoding;
+
+    /// Per-feature options. Generally ClangdServer lets these vary
+    /// per-request, but LSP allows limited/no customizations.
+    clangd::CodeCompleteOptions CodeCompleteOpts;
+    clangd::RenameOptions RenameOpts;
+  };
+  // Sensible default options for use in tests.
+  // Features like indexing must be enabled if desired.
+  static Options optsForTest();
+
   ClangdLSPServer(Transport &Transp, const ThreadsafeFS &TFS,
-                  const clangd::CodeCompleteOptions &CCOpts,
-                  const clangd::RenameOptions &RenameOpts,
-                  llvm::Optional<Path> CompileCommandsDir, bool UseDirBasedCDB,
-                  llvm::Optional<OffsetEncoding> ForcedOffsetEncoding,
-                  const ClangdServer::Options &Opts);
+                  const ClangdLSPServer::Options &Opts);
   /// The destructor blocks on any outstanding background tasks.
   ~ClangdLSPServer();
 
   /// Run LSP server loop, communicating with the Transport provided in the
   /// constructor. This method must not be executed more than once.
   ///
   /// \return Whether we shut down cleanly with a 'shutdown' -> 'exit' sequence.
   bool run();
private:
   template <typename T> void progress(const llvm::json::Value &Token, T Value) {
     ProgressParams<T> Params;
     Params.token = Token;
     Params.value = std::move(Value);
     notify("$/progress", Params);
   }
 
   const ThreadsafeFS &TFS;
-  /// Options used for code completion
-  clangd::CodeCompleteOptions CCOpts;
-  /// Options used for rename.
-  clangd::RenameOptions RenameOpts;
   /// Options used for diagnostics.
   ClangdDiagnosticOptions DiagOpts;
   /// The supported kinds of the client.
   SymbolKindBitset SupportedSymbolKinds;
   /// The supported completion item kinds of the client.
   CompletionItemKindBitset SupportedCompletionItemKinds;
   /// Whether the client supports CodeAction response objects.
   bool SupportsCodeAction = false;
private:
   // The progress to send when the progress bar is created.
   // Only valid in state Creating.
   BackgroundQueue::Stats PendingBackgroundIndexProgress;
   /// LSP extension: skip WorkDoneProgressCreate, just send progress streams.
   bool BackgroundIndexSkipCreate = false;
   // Store of the current versions of the open documents.
   DraftStore DraftMgr;
 
+  Options Opts;
   // The CDB is created by the "initialize" LSP method.
-  bool UseDirBasedCDB;                     // FIXME: make this a capability.
-  llvm::Optional<Path> CompileCommandsDir; // FIXME: merge with capability?
   std::unique_ptr<GlobalCompilationDatabase> BaseCDB;
   // CDB is BaseCDB plus any commands overridden via LSP extensions.
   llvm::Optional<OverlayCDB> CDB;
-  ClangdServer::Options ClangdServerOpts;
-  llvm::Optional<OffsetEncoding> NegotiatedOffsetEncoding;
   // The ClangdServer is created by the "initialize" LSP method.
   llvm::Optional<ClangdServer> Server;
 };
 } // namespace clangd
 } // namespace clang
 
 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_CLANGDLSPSERVER_H

clang-tools-extra/clangd/ClangdLSPServer.cpp

void onCancel(const llvm::json::Value &Params) {
     auto It = RequestCancelers.find(StrID);
     if (It != RequestCancelers.end())
       It->second.first(); // Invoke the canceler.
   }
 
   Context handlerContext() const {
     return Context::current().derive(
         kCurrentOffsetEncoding,
-        Server.NegotiatedOffsetEncoding.getValueOr(OffsetEncoding::UTF16));
+        Server.Opts.OffsetEncoding.getValueOr(OffsetEncoding::UTF16));
   }
 
   // We run cancelable requests in a context that does two things:
   //  - allows cancellation using RequestCancelers[ID]
   //  - cleans up the entry in RequestCancelers when it's no longer needed
   // If a client reuses an ID, the last wins and the first cannot be canceled.
   Context cancelableRequestContext(const llvm::json::Value &ID) {
     auto Task = cancelableTask(
for (unsigned I = 0; I <= static_cast<unsigned>(HighlightingKind::LastKind);
        ++I)
     Types.push_back(toSemanticTokenType(static_cast<HighlightingKind>(I)));
   return Types;
 }
 
 void ClangdLSPServer::onInitialize(const InitializeParams &Params,
                                    Callback<llvm::json::Value> Reply) {
   // Determine character encoding first as it affects constructed ClangdServer.
-  if (Params.capabilities.offsetEncoding && !NegotiatedOffsetEncoding) {
-    NegotiatedOffsetEncoding = OffsetEncoding::UTF16; // fallback
+  if (Params.capabilities.offsetEncoding && !Opts.OffsetEncoding) {
+    Opts.OffsetEncoding = OffsetEncoding::UTF16; // fallback
     for (OffsetEncoding Supported : *Params.capabilities.offsetEncoding)
       if (Supported != OffsetEncoding::UnsupportedEncoding) {
-        NegotiatedOffsetEncoding = Supported;
+        Opts.OffsetEncoding = Supported;
         break;
       }
   }
 
-  ClangdServerOpts.TheiaSemanticHighlighting =
+  Opts.TheiaSemanticHighlighting =
       Params.capabilities.TheiaSemanticHighlighting;
   if (Params.capabilities.TheiaSemanticHighlighting &&
       Params.capabilities.SemanticTokens) {
     log("Client supports legacy semanticHighlights notification and standard "
         "semanticTokens request, choosing the latter (no notifications).");
-    ClangdServerOpts.TheiaSemanticHighlighting = false;
+    Opts.TheiaSemanticHighlighting = false;
   }
 
   if (Params.rootUri && *Params.rootUri)
-    ClangdServerOpts.WorkspaceRoot = std::string(Params.rootUri->file());
+    Opts.WorkspaceRoot = std::string(Params.rootUri->file());
   else if (Params.rootPath && !Params.rootPath->empty())
-    ClangdServerOpts.WorkspaceRoot = *Params.rootPath;
+    Opts.WorkspaceRoot = *Params.rootPath;
   if (Server)
     return Reply(llvm::make_error<LSPError>("server already initialized",
                                             ErrorCode::InvalidRequest));
   if (const auto &Dir = Params.initializationOptions.compilationDatabasePath)
-    CompileCommandsDir = Dir;
-  if (UseDirBasedCDB) {
+    Opts.CompileCommandsDir = Dir;
+  if (Opts.UseDirBasedCDB) {
     BaseCDB = std::make_unique<DirectoryBasedGlobalCompilationDatabase>(
-        CompileCommandsDir);
-    BaseCDB = getQueryDriverDatabase(
-        llvm::makeArrayRef(ClangdServerOpts.QueryDriverGlobs),
+        Opts.CompileCommandsDir);
+    BaseCDB = getQueryDriverDatabase(llvm::makeArrayRef(Opts.QueryDriverGlobs),
                                      std::move(BaseCDB));
   }
   auto Mangler = CommandMangler::detect();
-  if (ClangdServerOpts.ResourceDir)
-    Mangler.ResourceDir = *ClangdServerOpts.ResourceDir;
+  if (Opts.ResourceDir)
+    Mangler.ResourceDir = *Opts.ResourceDir;
   CDB.emplace(BaseCDB.get(), Params.initializationOptions.fallbackFlags,
               tooling::ArgumentsAdjuster(std::move(Mangler)));
   {
     // Switch caller's context with LSPServer's background context. Since we
     // rather want to propagate information from LSPServer's context into the
     // Server, CDB, etc.
     WithContext MainContext(BackgroundContext.clone());
     llvm::Optional<WithContextValue> WithOffsetEncoding;
-    if (NegotiatedOffsetEncoding)
-      WithOffsetEncoding.emplace(kCurrentOffsetEncoding,
-                                 *NegotiatedOffsetEncoding);
-    Server.emplace(*CDB, TFS, ClangdServerOpts,
+    if (Opts.OffsetEncoding)
+      WithOffsetEncoding.emplace(kCurrentOffsetEncoding, *Opts.OffsetEncoding);
+    Server.emplace(*CDB, TFS, Opts,
                    static_cast<ClangdServer::Callbacks *>(this));
   }
   applyConfiguration(Params.initializationOptions.ConfigSettings);
 
-  CCOpts.EnableSnippets = Params.capabilities.CompletionSnippets;
-  CCOpts.IncludeFixIts = Params.capabilities.CompletionFixes;
-  if (!CCOpts.BundleOverloads.hasValue())
-    CCOpts.BundleOverloads = Params.capabilities.HasSignatureHelp;
-  CCOpts.DocumentationFormat =
+  Opts.CodeCompleteOpts.EnableSnippets = Params.capabilities.CompletionSnippets;
+  Opts.CodeCompleteOpts.IncludeFixIts = Params.capabilities.CompletionFixes;
+  if (!Opts.CodeCompleteOpts.BundleOverloads.hasValue())
+    Opts.CodeCompleteOpts.BundleOverloads =
+        Params.capabilities.HasSignatureHelp;
+  Opts.CodeCompleteOpts.DocumentationFormat =
       Params.capabilities.CompletionDocumentationFormat;
   DiagOpts.EmbedFixesInDiagnostics = Params.capabilities.DiagnosticFixes;
   DiagOpts.SendDiagnosticCategory = Params.capabilities.DiagnosticCategory;
   DiagOpts.EmitRelatedLocations =
       Params.capabilities.DiagnosticRelatedInformation;
   if (Params.capabilities.WorkspaceSymbolKinds)
     SupportedSymbolKinds |= *Params.capabilities.WorkspaceSymbolKinds;
   if (Params.capabilities.CompletionItemKinds)
llvm::json::Object Result{
             {"executeCommandProvider",
              llvm::json::Object{
                  {"commands",
                   {ExecuteCommandParams::CLANGD_APPLY_FIX_COMMAND,
                    ExecuteCommandParams::CLANGD_APPLY_TWEAK}},
              }},
             {"typeHierarchyProvider", true},
         }}}};
-  if (NegotiatedOffsetEncoding)
-    Result["offsetEncoding"] = *NegotiatedOffsetEncoding;
-  if (ClangdServerOpts.TheiaSemanticHighlighting)
+  if (Opts.OffsetEncoding)
+    Result["offsetEncoding"] = *Opts.OffsetEncoding;
+  if (Opts.TheiaSemanticHighlighting)
     Result.getObject("capabilities")
         ->insert(
             {"semanticHighlighting",
              llvm::json::Object{{"scopes", buildHighlightScopeLookupTable()}}});
-  if (ClangdServerOpts.FoldingRanges)
+  if (Opts.FoldingRanges)
     Result.getObject("capabilities")->insert({"foldingRangeProvider", true});
   Reply(std::move(Result));
 }
 
 void ClangdLSPServer::onInitialized(const InitializedParams &Params) {}
 
 void ClangdLSPServer::onShutdown(const ShutdownParams &Params,
                                  Callback<std::nullptr_t> Reply) {
Reply(llvm::make_error<LSPError>(
         ErrorCode::InvalidParams));
   }
 }
 
 void ClangdLSPServer::onWorkspaceSymbol(
     const WorkspaceSymbolParams &Params,
     Callback<std::vector<SymbolInformation>> Reply) {
   Server->workspaceSymbols(
-      Params.query, CCOpts.Limit,
+      Params.query, Opts.CodeCompleteOpts.Limit,
       [Reply = std::move(Reply),
        this](llvm::Expected<std::vector<SymbolInformation>> Items) mutable {
         if (!Items)
           return Reply(Items.takeError());
         for (auto &Sym : *Items)
           Sym.kind = adjustKindToCapability(Sym.kind, SupportedSymbolKinds);
 
         Reply(std::move(*Items));
       });
 }
 
 void ClangdLSPServer::onPrepareRename(const TextDocumentPositionParams &Params,
                                       Callback<llvm::Optional<Range>> Reply) {
   Server->prepareRename(Params.textDocument.uri.file(), Params.position,
-                        RenameOpts, std::move(Reply));
+                        Opts.RenameOpts, std::move(Reply));
 }
 
 void ClangdLSPServer::onRename(const RenameParams &Params,
                                Callback<WorkspaceEdit> Reply) {
   Path File = std::string(Params.textDocument.uri.file());
   if (!DraftMgr.getDraft(File))
     return Reply(llvm::make_error<LSPError>(
         "onRename called for non-added file", ErrorCode::InvalidParams));
   Server->rename(
-      File, Params.position, Params.newName, RenameOpts,
+      File, Params.position, Params.newName, Opts.RenameOpts,
       [File, Params, Reply = std::move(Reply),
        this](llvm::Expected<FileEdits> Edits) mutable {
         if (!Edits)
           return Reply(Edits.takeError());
         if (auto Err = validateEdits(DraftMgr, *Edits))
           return Reply(std::move(Err));
         WorkspaceEdit Result;
         Result.changes.emplace();

 void ClangdLSPServer::onCompletion(const CompletionParams &Params,
                                    Callback<CompletionList> Reply) {
   if (!shouldRunCompletion(Params)) {
     // Clients sometimes auto-trigger completions in undesired places (e.g.
     // 'a >^ '), we return empty results in those cases.
     vlog("ignored auto-triggered completion, preceding char did not match");
     return Reply(CompletionList());
   }
-  Server->codeComplete(Params.textDocument.uri.file(), Params.position, CCOpts,
+  Server->codeComplete(Params.textDocument.uri.file(), Params.position,
+                       Opts.CodeCompleteOpts,
                        [Reply = std::move(Reply),
                         this](llvm::Expected<CodeCompleteResult> List) mutable {
                          if (!List)
                            return Reply(List.takeError());
                          CompletionList LSPList;
                          LSPList.isIncomplete = List->HasMore;
                          for (const auto &R : List->Completions) {
-                           CompletionItem C = R.render(CCOpts);
+                           CompletionItem C = R.render(Opts.CodeCompleteOpts);
                            C.kind = adjustKindToCapability(
                                C.kind, SupportedCompletionItemKinds);
                            LSPList.items.push_back(std::move(C));
                          }
                          return Reply(std::move(LSPList));
                        });
 }
 

 void ClangdLSPServer::onChangeConfiguration(
     const DidChangeConfigurationParams &Params) {
   applyConfiguration(Params.settings);
 }
 
 void ClangdLSPServer::onReference(const ReferenceParams &Params,
                                   Callback<std::vector<Location>> Reply) {
   Server->findReferences(Params.textDocument.uri.file(), Params.position,
-                         CCOpts.Limit,
+                         Opts.CodeCompleteOpts.Limit,
                          [Reply = std::move(Reply)](
                              llvm::Expected<ReferencesResult> Refs) mutable {
                            if (!Refs)
                              return Reply(Refs.takeError());
                            return Reply(std::move(Refs->References));
                          });
 }
 
Server->semanticHighlights(
           increment(Last.resultId);
           Result.resultId = Last.resultId;
         }
 
         CB(std::move(Result));
       });
 }
 
-ClangdLSPServer::ClangdLSPServer(
-    class Transport &Transp, const ThreadsafeFS &TFS,
-    const clangd::CodeCompleteOptions &CCOpts,
-    const clangd::RenameOptions &RenameOpts,
-    llvm::Optional<Path> CompileCommandsDir, bool UseDirBasedCDB,
-    llvm::Optional<OffsetEncoding> ForcedOffsetEncoding,
-    const ClangdServer::Options &Opts)
+ClangdLSPServer::Options ClangdLSPServer::optsForTest() {
+  Options Opts;
+  ClangdServer::Options &Base = Opts;
+  Base = ClangdServer::optsForTest();
+  return Opts;
+}
+
+ClangdLSPServer::ClangdLSPServer(class Transport &Transp,
+                                 const ThreadsafeFS &TFS,
+                                 const ClangdLSPServer::Options &Opts)
     : BackgroundContext(Context::current().clone()), Transp(Transp),
-      MsgHandler(new MessageHandler(*this)), TFS(TFS), CCOpts(CCOpts),
-      RenameOpts(RenameOpts), SupportedSymbolKinds(defaultSymbolKinds()),
-      SupportedCompletionItemKinds(defaultCompletionItemKinds()),
-      UseDirBasedCDB(UseDirBasedCDB),
-      CompileCommandsDir(std::move(CompileCommandsDir)), ClangdServerOpts(Opts),
-      NegotiatedOffsetEncoding(ForcedOffsetEncoding) {
+      MsgHandler(new MessageHandler(*this)), TFS(TFS),
+      SupportedSymbolKinds(defaultSymbolKinds()),
+      SupportedCompletionItemKinds(defaultCompletionItemKinds()), Opts(Opts) {
   // clang-format off
   MsgHandler->bind("initialize", &ClangdLSPServer::onInitialize);
   MsgHandler->bind("initialized", &ClangdLSPServer::onInitialized);
   MsgHandler->bind("shutdown", &ClangdLSPServer::onShutdown);
   MsgHandler->bind("sync", &ClangdLSPServer::onSync);
   MsgHandler->bind("textDocument/rangeFormatting", &ClangdLSPServer::onDocumentRangeFormatting);
   MsgHandler->bind("textDocument/onTypeFormatting", &ClangdLSPServer::onDocumentOnTypeFormatting);
   MsgHandler->bind("textDocument/formatting", &ClangdLSPServer::onDocumentFormatting);

clang-tools-extra/clangd/tool/ClangdMain.cpp

log("PID: {0}", llvm::sys::Process::getProcessId());
     else
       log("Working directory: {0}", CWD);
   }
   for (int I = 0; I < argc; ++I)
     log("argv[{0}]: {1}", I, argv[I]);
   if (auto EnvFlags = llvm::sys::Process::GetEnv(FlagsEnvVar))
     log("{0}: {1}", FlagsEnvVar, *EnvFlags);
 
+  ClangdLSPServer::Options Opts;
+  Opts.UseDirBasedCDB = (CompileArgsFrom == FilesystemCompileArgs);
+
   // If --compile-commands-dir arg was invoked, check value and override default
   // path.
-  llvm::Optional<Path> CompileCommandsDirPath;
   if (!CompileCommandsDir.empty()) {
     if (llvm::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.
       llvm::SmallString<128> Path(CompileCommandsDir);
       if (std::error_code EC = llvm::sys::fs::make_absolute(Path)) {
         elog("Error while converting the relative path specified by "
              "--compile-commands-dir to an absolute path: {0}. The argument "
              "will be ignored.",
              EC.message());
       } else {
-        CompileCommandsDirPath = std::string(Path.str());
+        Opts.CompileCommandsDir = std::string(Path.str());
       }
     } else {
       elog("Path specified by --compile-commands-dir does not exist. The "
            "argument will be ignored.");
     }
   }
 
-  ClangdServer::Options Opts;
   switch (PCHStorage) {
   case PCHStorageFlag::Memory:
     Opts.StorePreamblesInMemory = true;
     break;
   case PCHStorageFlag::Disk:
     Opts.StorePreamblesInMemory = false;
     break;
   }

 #endif
   Opts.BackgroundIndex = EnableBackgroundIndex;
   Opts.StaticIndex = StaticIdx.get();
   Opts.AsyncThreadsCount = WorkerThreadsCount;
   Opts.BuildRecoveryAST = RecoveryAST;
   Opts.PreserveRecoveryASTType = RecoveryASTType;
   Opts.FoldingRanges = FoldingRanges;
 
-  clangd::CodeCompleteOptions CCOpts;
-  CCOpts.IncludeIneligibleResults = IncludeIneligibleResults;
-  CCOpts.Limit = LimitResults;
+  Opts.CodeCompleteOpts.IncludeIneligibleResults = IncludeIneligibleResults;
+  Opts.CodeCompleteOpts.Limit = LimitResults;
   if (CompletionStyle.getNumOccurrences())
-    CCOpts.BundleOverloads = CompletionStyle != Detailed;
-  CCOpts.ShowOrigins = ShowOrigins;
-  CCOpts.InsertIncludes = HeaderInsertion;
+    Opts.CodeCompleteOpts.BundleOverloads = CompletionStyle != Detailed;
+  Opts.CodeCompleteOpts.ShowOrigins = ShowOrigins;
+  Opts.CodeCompleteOpts.InsertIncludes = HeaderInsertion;
   if (!HeaderInsertionDecorators) {
-    CCOpts.IncludeIndicator.Insert.clear();
-    CCOpts.IncludeIndicator.NoInsert.clear();
+    Opts.CodeCompleteOpts.IncludeIndicator.Insert.clear();
+    Opts.CodeCompleteOpts.IncludeIndicator.NoInsert.clear();
   }
-  CCOpts.SpeculativeIndexRequest = Opts.StaticIndex;
-  CCOpts.EnableFunctionArgSnippets = EnableFunctionArgSnippets;
-  CCOpts.AllScopes = AllScopesCompletion;
-  CCOpts.RunParser = CodeCompletionParse;
+  Opts.CodeCompleteOpts.SpeculativeIndexRequest = Opts.StaticIndex;
+  Opts.CodeCompleteOpts.EnableFunctionArgSnippets = EnableFunctionArgSnippets;
+  Opts.CodeCompleteOpts.AllScopes = AllScopesCompletion;
+  Opts.CodeCompleteOpts.RunParser = CodeCompletionParse;
 
   RealThreadsafeFS TFS;
   std::vector<std::unique_ptr<config::Provider>> ProviderStack;
   std::unique_ptr<config::Provider> Config;
   if (EnableConfig) {
     ProviderStack.push_back(
         config::Provider::fromAncestorRelativeYAMLFiles(".clangd", TFS));
     llvm::SmallString<256> UserConfig;
#endif
   Opts.QueryDriverGlobs = std::move(QueryDriverGlobs);
   Opts.TweakFilter = [&](const Tweak &T) {
     if (T.hidden() && !HiddenFeatures)
       return false;
     if (TweakList.getNumOccurrences())
       return llvm::is_contained(TweakList, T.id());
     return true;
   };
-  llvm::Optional<OffsetEncoding> OffsetEncodingFromFlag;
   if (ForceOffsetEncoding != OffsetEncoding::UnsupportedEncoding)
-    OffsetEncodingFromFlag = ForceOffsetEncoding;
+    Opts.OffsetEncoding = ForceOffsetEncoding;
 
-  clangd::RenameOptions RenameOpts;
   // Shall we allow to customize the file limit?
-  RenameOpts.AllowCrossFile = CrossFileRename;
+  Opts.RenameOpts.AllowCrossFile = CrossFileRename;
 
   // Initialize and run ClangdLSPServer.
   // Change stdin to binary to not lose \r\n on windows.
   llvm::sys::ChangeStdinToBinary();
   std::unique_ptr<Transport> TransportLayer;
   if (getenv("CLANGD_AS_XPC_SERVICE")) {
 #if CLANGD_BUILD_XPC
     log("Starting LSP over XPC service");
if (!PathMappingsArg.empty()) {
     if (!Mappings) {
       elog("Invalid -path-mappings: {0}", Mappings.takeError());
       return 1;
     }
     TransportLayer = createPathMappingTransport(std::move(TransportLayer),
                                                 std::move(*Mappings));
   }
 
-  ClangdLSPServer LSPServer(
-      *TransportLayer, TFS, CCOpts, RenameOpts, CompileCommandsDirPath,
-      /*UseDirBasedCDB=*/CompileArgsFrom == FilesystemCompileArgs,
-      OffsetEncodingFromFlag, Opts);
+  ClangdLSPServer LSPServer(*TransportLayer, TFS, Opts);
   llvm::set_thread_name("clangd.main");
   int ExitCode = LSPServer.run()
                      ? 0
                      : static_cast<int>(ErrorResultCode::NoShutdownRequest);
   log("LSP finished, exiting with status {0}", ExitCode);
 
   // There may still be lingering background threads (e.g. slow requests
   // whose results will be dropped, background index shutting down).

clang-tools-extra/clangd/unittests/ClangdLSPServerTests.cpp

 }
 
 class LSPTest : public ::testing::Test, private clangd::Logger {
 protected:
   LSPTest() : LogSession(*this) {}
 
   LSPClient &start() {
     EXPECT_FALSE(Server.hasValue()) << "Already initialized";
-    Server.emplace(Client.transport(), FS, CCOpts, RenameOpts,
-                   /*CompileCommandsDir=*/llvm::None, /*UseDirBasedCDB=*/false,
-                   /*ForcedOffsetEncoding=*/llvm::None, Opts);
+    Server.emplace(Client.transport(), FS, Opts);
     ServerThread.emplace([&] { EXPECT_TRUE(Server->run()); });
     Client.call("initialize", llvm::json::Object{});
     return Client;
   }
 
   void stop() {
     assert(Server);
     Client.call("shutdown", nullptr);
     Client.notify("exit", nullptr);
     Client.stop();
     ServerThread->join();
     Server.reset();
     ServerThread.reset();
   }
 
   ~LSPTest() {
     if (Server)
       stop();
   }
 
   MockFS FS;
-  CodeCompleteOptions CCOpts;
-  RenameOptions RenameOpts;
-  ClangdServer::Options Opts = ClangdServer::optsForTest();
+  ClangdLSPServer::Options Opts = ClangdLSPServer::optsForTest();
 
 private:
   // Color logs so we can distinguish them from test output.
   void log(Level L, const llvm::formatv_object_base &Message) override {
     raw_ostream::Colors Color;
     switch (L) {
     case Level::Verbose:
       Color = raw_ostream::BLUE;