[clangd] Trace per-token time in clangd --check

clang-tools-extra/clangd/tool/Check.cpp

@@ -37,6 +37,7 @@
 #include "index/FileIndex.h"
 #include "refactor/Tweak.h"
 #include "support/ThreadsafeFS.h"
+#include "support/Trace.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/Basic/DiagnosticIDs.h"
 #include "clang/Format/Format.h"
@@ -195,6 +196,7 @@ class Checker {
   void testLocationFeatures(
       llvm::function_ref<bool(const Position &)> ShouldCheckLine,
       const bool EnableCodeCompletion) {
+    trace::Span Trace("testLocationFeatures");
     log("Testing features at each token (may be slow in large files)");
     auto &SM = AST->getSourceManager();
     auto SpelledTokens = AST->getTokens().spelledTokens(SM.getMainFileID());
@@ -210,6 +212,10 @@ class Checker {
       if (!ShouldCheckLine(Pos))
         continue;
 
+      trace::Span Trace("Token");
+      SPAN_ATTACH(Trace, "pos", Pos);
+      SPAN_ATTACH(Trace, "text", Tok.text(AST->getSourceManager()));
+
       // FIXME: dumping the tokens may leak sensitive code into bug reports.
       // Add an option to turn this off, once we decide how options work.
       vlog("  {0} {1}", Pos, Tok.text(AST->getSourceManager()));