Simplify semantic highlighting; improve hover of auto &&

src/indexer.cc

@@ -524,7 +524,8 @@ public:
       binding = true;
     }
     auto BT = GetBaseType(T, false);
-    if (!BT.isNull() && (binding || BT->getAs<AutoType>())) {
+    if (!BT.isNull() &&
+        (binding || BT.getUnqualifiedType()->getAs<AutoType>())) {
       SmallString<256> Str;
       llvm::raw_svector_ostream OS(Str);
       PrintingPolicy PP = GetDefaultPolicy();

src/message_handler.cc

@@ -60,34 +60,6 @@ struct ScanLineEvent {
 };
 } // namespace
 
-int SemanticHighlight::GetStableId(SymbolKind kind, Usr usr) {
-  decltype(func2id) *map;
-  switch (kind) {
-  case SymbolKind::Func:
-    map = &func2id;
-    break;
-  case SymbolKind::Type:
-    map = &type2id;
-    break;
-  case SymbolKind::Var:
-    map = &var2id;
-    break;
-  case SymbolKind::File:
-  case SymbolKind::Invalid:
-    llvm_unreachable("");
-  }
-
-  auto it = map->try_emplace(usr, next_id);
-  if (it.second)
-    next_id++;
-  return it.first->second;
-}
-
-void SemanticHighlight::Init() {
-  match_ = std::make_unique<GroupMatch>(g_config->highlight.whitelist,
-                                        g_config->highlight.blacklist);
-}
-
 MessageHandler::MessageHandler() {
   // Dynamically allocate |message_handlers|, otherwise there will be static
   // initialization order races.
@@ -157,11 +129,12 @@ void EmitSkippedRanges(WorkingFile *working_file,
   pipeline::WriteStdout(kMethodType_CclsPublishSkippedRanges, out);
 }
 
-void EmitSemanticHighlighting(DB *db, SemanticHighlight *highlight,
-                              WorkingFile *wfile, QueryFile *file) {
+void EmitSemanticHighlighting(DB *db, WorkingFile *wfile, QueryFile *file) {
+  static GroupMatch match(g_config->highlight.whitelist,
+                          g_config->highlight.blacklist);
   assert(file->def);
   if (wfile->buffer_content.size() > g_config->largeFileSize ||
-      !highlight->match_->IsMatch(file->def->path))
+      !match.IsMatch(file->def->path))
     return;
 
   // Group symbols together.
@@ -174,10 +147,12 @@ void EmitSemanticHighlighting(DB *db, SemanticHighlight *highlight,
     lsSymbolKind parent_kind = lsSymbolKind::Unknown;
     lsSymbolKind kind = lsSymbolKind::Unknown;
     uint8_t storage = SC_None;
+    int idx;
     // This switch statement also filters out symbols that are not highlighted.
     switch (sym.kind) {
     case SymbolKind::Func: {
-      const QueryFunc &func = db->GetFunc(sym);
+      idx = db->func_usr[sym.usr];
+      const QueryFunc &func = db->funcs[idx];
       const QueryFunc::Def *def = func.AnyDef();
       if (!def)
         continue; // applies to for loop
@@ -218,8 +193,10 @@ void EmitSemanticHighlighting(DB *db, SemanticHighlight *highlight,
       sym.range.end.column = start_col + concise_name.size();
       break;
     }
-    case SymbolKind::Type:
-      for (auto &def : db->GetType(sym).def) {
+    case SymbolKind::Type: {
+      idx = db->type_usr[sym.usr];
+      const QueryType &type = db->types[idx];
+      for (auto &def : type.def) {
         kind = def.kind;
         detailed_name = def.detailed_name;
         if (def.spell) {
@@ -228,8 +205,10 @@ void EmitSemanticHighlighting(DB *db, SemanticHighlight *highlight,
         }
       }
       break;
+    }
     case SymbolKind::Var: {
-      const QueryVar &var = db->GetVar(sym);
+      idx = db->var_usr[sym.usr];
+      const QueryVar &var = db->vars[idx];
       for (auto &def : var.def) {
         kind = def.kind;
         storage = def.storage;
@@ -258,7 +237,7 @@ void EmitSemanticHighlighting(DB *db, SemanticHighlight *highlight,
         it->second.lsRanges.push_back(*loc);
       } else {
         Out_CclsPublishSemanticHighlighting::Symbol symbol;
-        symbol.stableId = highlight->GetStableId(sym.kind, sym.usr);
+        symbol.stableId = idx;
         symbol.parentKind = parent_kind;
         symbol.kind = kind;
         symbol.storage = storage;

src/message_handler.h

@@ -36,17 +36,6 @@ struct DB;
 struct WorkingFile;
 struct WorkingFiles;
 
-// Caches symbols for a single file for semantic highlighting to provide
-// relatively stable ids. Only supports xxx files at a time.
-struct SemanticHighlight {
-  llvm::DenseMap<Usr, int, DenseMapInfoForUsr> func2id, type2id, var2id;
-  uint32_t next_id = 0;
-  std::unique_ptr<GroupMatch> match_;
-
-  void Init();
-  int GetStableId(SymbolKind kind, Usr usr);
-};
-
 struct Out_CclsPublishSemanticHighlighting
     : public lsOutMessage<Out_CclsPublishSemanticHighlighting> {
   struct Symbol {
@@ -89,7 +78,6 @@ struct MessageHandler {
   DB *db = nullptr;
   Project *project = nullptr;
   VFS *vfs = nullptr;
-  SemanticHighlight *highlight = nullptr;
   WorkingFiles *working_files = nullptr;
   CompletionManager *clang_complete = nullptr;
   IncludeComplete *include_complete = nullptr;
@@ -119,5 +107,5 @@ bool FindFileOrFail(DB *db, Project *project, std::optional<lsRequestId> id,
 void EmitSkippedRanges(WorkingFile *working_file,
                        const std::vector<Range> &skipped_ranges);
 
-void EmitSemanticHighlighting(DB *db, SemanticHighlight *highlight,
-                              WorkingFile *working_file, QueryFile *file);
+void EmitSemanticHighlighting(DB *db, WorkingFile *working_file,
+                              QueryFile *file);

src/messages/initialize.cc

@@ -487,7 +487,6 @@ struct Handler_Initialize : BaseMessageHandler<In_InitializeRequest> {
     }
 
     idx::Init();
-    highlight->Init();
 
     // Open up / load the project.
     project->Load(project_path);

src/messages/textDocument_didOpen.cc

@@ -59,7 +59,7 @@ struct Handler_TextDocumentDidOpen
     FindFileOrFail(db, project, std::nullopt, path, &file);
     if (file && file->def) {
       EmitSkippedRanges(working_file, file->def->skipped_ranges);
-      EmitSemanticHighlighting(db, highlight, working_file, file);
+      EmitSemanticHighlighting(db, working_file, file);
     }
 
     include_complete->AddFile(working_file->filename);

src/pipeline.cc

@@ -368,8 +368,7 @@ void Indexer_Main(CompletionManager *completion, VFS *vfs, Project *project,
       indexer_waiter->Wait(index_request);
 }
 
-void Main_OnIndexed(DB *db, SemanticHighlight *highlight,
-                    WorkingFiles *working_files, IndexUpdate *update) {
+void Main_OnIndexed(DB *db, WorkingFiles *working_files, IndexUpdate *update) {
   if (update->refresh) {
     LOG_S(INFO)
         << "loaded project. Refresh semantic highlight for all working file.";
@@ -379,7 +378,7 @@ void Main_OnIndexed(DB *db, SemanticHighlight *highlight,
       if (db->name2file_id.find(filename) == db->name2file_id.end())
         continue;
       QueryFile *file = &db->files[db->name2file_id[filename]];
-      EmitSemanticHighlighting(db, highlight, f.get(), file);
+      EmitSemanticHighlighting(db, f.get(), file);
     }
     return;
   }
@@ -399,8 +398,7 @@ void Main_OnIndexed(DB *db, SemanticHighlight *highlight,
       wfile->SetIndexContent(g_config->index.onChange ? wfile->buffer_content
                                                       : def_u.second);
       EmitSkippedRanges(wfile, def_u.first.skipped_ranges);
-      EmitSemanticHighlighting(db, highlight, wfile,
-                               &db->files[update->file_id]);
+      EmitSemanticHighlighting(db, wfile, &db->files[update->file_id]);
     }
   }
 }
@@ -470,7 +468,6 @@ void LaunchStdout() {
 
 void MainLoop() {
   Project project;
-  SemanticHighlight highlight;
   WorkingFiles working_files;
   VFS vfs;
 
@@ -502,13 +499,12 @@ void MainLoop() {
     handler->db = &db;
     handler->project = &project;
     handler->vfs = &vfs;
-    handler->highlight = &highlight;
     handler->working_files = &working_files;
     handler->clang_complete = &clang_complete;
     handler->include_complete = &include_complete;
   }
 
-  bool last_indexed = false;
+  bool has_indexed = false;
   while (true) {
     std::vector<std::unique_ptr<InMessage>> messages = on_request->DequeueAll();
     bool did_work = messages.size();
@@ -532,15 +528,18 @@ void MainLoop() {
         break;
       did_work = true;
       indexed = true;
-      Main_OnIndexed(&db, &highlight, &working_files, &*update);
+      Main_OnIndexed(&db, &working_files, &*update);
     }
 
-    if (!did_work) {
-      if (last_indexed)
+    if (did_work)
+      has_indexed |= indexed;
+    else {
+      if (has_indexed) {
         FreeUnusedMemory();
+        has_indexed = false;
+      }
       main_waiter->Wait(on_indexed, on_request);
     }
-    last_indexed = indexed;
   }
 }