[PATCH] D49991: [clangd] Do not build AST if no diagnostics were requested

[Ilya Biryukov via Phabricator via cfe-commits]

ilya-biryukov updated this revision to Diff 158234.
ilya-biryukov added a comment.

- Rebase onto head


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D49991

Files:
  clangd/TUScheduler.cpp


Index: clangd/TUScheduler.cpp
===================================================================
--- clangd/TUScheduler.cpp
+++ clangd/TUScheduler.cpp
@@ -391,19 +391,22 @@
       }
     }
 
+    // We only need to build the AST if diagnostics were requested.
+    if (WantDiags == WantDiagnostics::No)
+      return;
+
     // Get the AST for diagnostics.
     llvm::Optional<std::unique_ptr<ParsedAST>> AST = IdleASTs.take(this);
     if (!AST) {
       llvm::Optional<ParsedAST> NewAST =
           buildAST(FileName, std::move(Invocation), Inputs, NewPreamble, PCHs);
       AST = NewAST ? llvm::make_unique<ParsedAST>(std::move(*NewAST)) : nullptr;
     }
-
     // We want to report the diagnostics even if this update was cancelled.
     // It seems more useful than making the clients wait indefinitely if they
     // spam us with updates.
     // Note *AST can be still be null if buildAST fails.
-    if (WantDiags != WantDiagnostics::No && *AST) {
+    if (*AST) {
       OnUpdated((*AST)->getDiagnostics());
       DiagsWereReported = true;
     }


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