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

This reverts commit 9d9ceb3.

First time round caused some build bot failures due to older compilers not patched with the Defect Report about full specialization being allowed at class scope.

Author: njames93

clang-tools-extra/clangd/ClangdLSPServer.cpp

@@ -258,6 +258,15 @@ class ClangdLSPServer::MessageHandler : public Transport::MessageHandler {
     };
   }
 
+  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.
@@ -301,6 +310,12 @@ class ClangdLSPServer::MessageHandler : public Transport::MessageHandler {
     };
   }
 
+  void bind(const char *Method, void (ClangdLSPServer::*Handler)()) {
+    Notifications[Method] = [Handler, this](llvm::json::Value RawParams) {
+      (Server.*Handler)();
+    };
+  }
+
 private:
   // Function object to reply to an LSP call.
   // Each instance must be called exactly once, otherwise:
@@ -443,6 +458,14 @@ class ClangdLSPServer::MessageHandler : public Transport::MessageHandler {
 };
 constexpr int ClangdLSPServer::MessageHandler::MaxReplayCallbacks;
 
+template <>
+void ClangdLSPServer::MessageHandler::bind<NoParams>(
+    const char *Method, void (ClangdLSPServer::*Handler)(const NoParams &)) {
+  Notifications[Method] = [Handler, this](llvm::json::Value RawParams) {
+    (Server.*Handler)(NoParams{});
+  };
+}
+
 // call(), notify(), and reply() wrap the Transport, adding logging and locking.
 void ClangdLSPServer::callRaw(StringRef Method, llvm::json::Value Params,
                               Callback<llvm::json::Value> CB) {
@@ -647,17 +670,15 @@ void ClangdLSPServer::onInitialize(const InitializeParams &Params,
 
 void ClangdLSPServer::onInitialized(const InitializedParams &Params) {}
 
-void ClangdLSPServer::onShutdown(const ShutdownParams &Params,
-                                 Callback<std::nullptr_t> Reply) {
+void ClangdLSPServer::onShutdown(Callback<std::nullptr_t> Reply) {
   // Do essentially nothing, just say we're ready to exit.
   ShutdownRequestReceived = true;
   Reply(nullptr);
 }
 
 // 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(const NoParams &Params,
-                             Callback<std::nullptr_t> Reply) {
+void ClangdLSPServer::onSync(Callback<std::nullptr_t> Reply) {
   if (Server->blockUntilIdleForTest(/*TimeoutSeconds=*/60))
     Reply(nullptr);
   else
@@ -1445,8 +1466,7 @@ void ClangdLSPServer::onSemanticTokensDelta(
       });
 }
 
-void ClangdLSPServer::onMemoryUsage(const NoParams &,
-                                    Callback<MemoryTree> Reply) {
+void ClangdLSPServer::onMemoryUsage(Callback<MemoryTree> Reply) {
   llvm::BumpPtrAllocator DetailAlloc;
   MemoryTree MT(&DetailAlloc);
   profile(MT);

clang-tools-extra/clangd/ClangdLSPServer.h

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

clang-tools-extra/clangd/Protocol.h

@@ -265,8 +265,6 @@ 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.