[clangd] Attach more information about Sema completion to traces

Reviewers: hokein, ioeric, sammccall

Reviewed By: sammccall

Subscribers: klimek, cfe-commits, jkorous-apple

Differential Revision: https://reviews.llvm.org/D43377

llvm-svn: 325491
diff --git a/clang-tools-extra/clangd/CodeComplete.cpp b/clang-tools-extra/clangd/CodeComplete.cpp
index 45bc702..3424ea2 100644
--- a/clang-tools-extra/clangd/CodeComplete.cpp
+++ b/clang-tools-extra/clangd/CodeComplete.cpp
@@ -855,9 +855,12 @@
     CompletionList Output;
     semaCodeComplete(std::move(RecorderOwner), Opts.getClangCompleteOpts(),
                      SemaCCInput, [&] {
-                       if (Recorder.CCSema)
+                       if (Recorder.CCSema) {
                          Output = runWithSema();
-                       else
+                         SPAN_ATTACH(
+                             Tracer, "sema_completion_kind",
+                             getCompletionKindString(Recorder.CCContext.getKind()));
+                       } else
                          log("Code complete: no Sema callback, 0 results");
                      });