Revert "[clangd][NFC] Simplify handing on methods with no params"

This broke the build http://lab.llvm.org:8011/#/builders/7/builds/1405

This reverts commit f05b492aae.

Differential Revision: https://reviews.llvm.org/D95385

clang-tools-extra/clangd/ClangdLSPServer.cpp

@@ -258,15 +258,6 @@ public:
     };
   }
 
-  template <typename Result>
-  void bind(const char *Method,
-            void (ClangdLSPServer::*Handler)(Callback<Result>)) {
-    Calls[Method] = [Handler, this](llvm::json::Value RawParams,
-                                    ReplyOnce Reply) {
-      (Server.*Handler)(std::move(Reply));
-    };
-  }
-
   // Bind a reply callback to a request. The callback will be invoked when
   // clangd receives the reply from the LSP client.
   // Return a call id of the request.
@@ -310,20 +301,6 @@ public:
     };
   }
 
-  void bind(const char *Method, void (ClangdLSPServer::*Handler)()) {
-    Notifications[Method] = [Handler, this](llvm::json::Value RawParams) {
-      (Server.*Handler)();
-    };
-  }
-
-  template <>
-  void bind<NoParams>(const char *Method,
-                      void (ClangdLSPServer::*Handler)(const NoParams &)) {
-    Notifications[Method] = [Handler, this](llvm::json::Value RawParams) {
-      (Server.*Handler)(NoParams{});
-    };
-  }
-
 private:
   // Function object to reply to an LSP call.
   // Each instance must be called exactly once, otherwise:
@@ -670,7 +647,8 @@ void ClangdLSPServer::onInitialize(const InitializeParams &Params,
 
 void ClangdLSPServer::onInitialized(const InitializedParams &Params) {}
 
-void ClangdLSPServer::onShutdown(Callback<std::nullptr_t> Reply) {
+void ClangdLSPServer::onShutdown(const ShutdownParams &Params,
+                                 Callback<std::nullptr_t> Reply) {
   // Do essentially nothing, just say we're ready to exit.
   ShutdownRequestReceived = true;
   Reply(nullptr);
@@ -678,7 +656,8 @@ void ClangdLSPServer::onShutdown(Callback<std::nullptr_t> Reply) {
 
 // sync is a clangd extension: it blocks until all background work completes.
 // It blocks the calling thread, so no messages are processed until it returns!
-void ClangdLSPServer::onSync(Callback<std::nullptr_t> Reply) {
+void ClangdLSPServer::onSync(const NoParams &Params,
+                             Callback<std::nullptr_t> Reply) {
   if (Server->blockUntilIdleForTest(/*TimeoutSeconds=*/60))
     Reply(nullptr);
   else
@@ -1466,7 +1445,8 @@ void ClangdLSPServer::onSemanticTokensDelta(
       });
 }
 
-void ClangdLSPServer::onMemoryUsage(Callback<MemoryTree> Reply) {
+void ClangdLSPServer::onMemoryUsage(const NoParams &,
+                                    Callback<MemoryTree> Reply) {
   llvm::BumpPtrAllocator DetailAlloc;
   MemoryTree MT(&DetailAlloc);
   profile(MT);

clang-tools-extra/clangd/ClangdLSPServer.h

@@ -93,8 +93,8 @@ private:
   // Calls have signature void(const Params&, Callback<Response>).
   void onInitialize(const InitializeParams &, Callback<llvm::json::Value>);
   void onInitialized(const InitializedParams &);
-  void onShutdown(Callback<std::nullptr_t>);
-  void onSync(Callback<std::nullptr_t>);
+  void onShutdown(const ShutdownParams &, Callback<std::nullptr_t>);
+  void onSync(const NoParams &, Callback<std::nullptr_t>);
   void onDocumentDidOpen(const DidOpenTextDocumentParams &);
   void onDocumentDidChange(const DidChangeTextDocumentParams &);
   void onDocumentDidClose(const DidCloseTextDocumentParams &);
@@ -161,7 +161,7 @@ private:
                              Callback<SemanticTokensOrDelta>);
   /// This is a clangd extension. Provides a json tree representing memory usage
   /// hierarchy.
-  void onMemoryUsage(Callback<MemoryTree>);
+  void onMemoryUsage(const NoParams &, Callback<MemoryTree>);
 
   std::vector<Fix> getFixes(StringRef File, const clangd::Diagnostic &D);
 

clang-tools-extra/clangd/Protocol.h

@@ -265,6 +265,8 @@ inline bool fromJSON(const llvm::json::Value &, NoParams &, llvm::json::Path) {
   return true;
 }
 using InitializedParams = NoParams;
+using ShutdownParams = NoParams;
+using ExitParams = NoParams;
 
 /// Defines how the host (editor) should sync document changes to the language
 /// server.