[PATCH] D92157: [clangd] Add language metrics for recovery AST usage.

[Haojian Wu via Phabricator via cfe-commits]

hokein created this revision.
hokein added a reviewer: sammccall.
Herald added subscribers: usaxena95, kadircet, arphaman.
Herald added a project: clang.
hokein requested review of this revision.
Herald added subscribers: MaskRay, ilya-biryukov.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92157

Files:
  clang-tools-extra/clangd/Selection.cpp
  clang-tools-extra/clangd/unittests/SelectionTests.cpp


Index: clang-tools-extra/clangd/unittests/SelectionTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/SelectionTests.cpp
+++ clang-tools-extra/clangd/unittests/SelectionTests.cpp
@@ -18,6 +18,7 @@
 namespace clang {
 namespace clangd {
 namespace {
+using ::testing::ElementsAreArray;
 using ::testing::UnorderedElementsAreArray;
 
 // Create a selection tree corresponding to a point or pair of points.
@@ -469,7 +470,7 @@
       EXPECT_TRUE(verifyCommonAncestor(T.root(), T.commonAncestor(), C.Code))
           << C.Code;
       EXPECT_THAT(Tracer.takeMetric("selection_recovery"),
-                  testing::ElementsAreArray({0}));
+                  ElementsAreArray({0}));
     }
   }
 }
@@ -494,10 +495,11 @@
   auto AST = TestTU::withCode(Annotations(Code).code()).build();
   trace::TestTracer Tracer;
   auto T = makeSelectionTree(Code, AST);
-  EXPECT_THAT(Tracer.takeMetric("selection_recovery"),
-              testing::ElementsAreArray({1}));
+  EXPECT_THAT(Tracer.takeMetric("selection_recovery"), ElementsAreArray({1}));
   EXPECT_THAT(Tracer.takeMetric("selection_recovery_type"),
-              testing::ElementsAreArray({1}));
+              ElementsAreArray({1}));
+  EXPECT_THAT(Tracer.takeMetric("selection_recovery_available", "C++"),
+              ElementsAreArray({1}));
 }
 
 // FIXME: Doesn't select the binary operator node in
Index: clang-tools-extra/clangd/Selection.cpp
===================================================================
--- clang-tools-extra/clangd/Selection.cpp
+++ clang-tools-extra/clangd/Selection.cpp
@@ -37,17 +37,30 @@
 using Node = SelectionTree::Node;
 using ast_type_traits::DynTypedNode;
 
+std::string getLanguage(const clang::LangOptions &Lang) {
+  if (Lang.C99 || Lang.C11 || Lang.C17 || Lang.C2x)
+    return "C";
+  if (Lang.ObjC)
+    return "ObjC";
+  if (Lang.CPlusPlus)
+    return "C++";
+  return "Others"; // others we don't care.
+}
+
 // Measure the fraction of selections that were enabled by recovery AST.
-void recordMetrics(const SelectionTree &S) {
+void recordMetrics(const SelectionTree &S, const ASTContext &AST) {
   static constexpr trace::Metric SelectionUsedRecovery(
       "selection_recovery", trace::Metric::Distribution);
   static constexpr trace::Metric RecoveryType("selection_recovery_type",
                                               trace::Metric::Distribution);
+  static constexpr trace::Metric RecoveryAvailable(
+      "selection_recovery_available", trace::Metric::Counter, "languages");
   const auto *Common = S.commonAncestor();
   for (const auto *N = Common; N; N = N->Parent) {
     if (const auto *RE = N->ASTNode.get<RecoveryExpr>()) {
       SelectionUsedRecovery.record(1); // used recovery ast.
       RecoveryType.record(RE->isTypeDependent() ? 0 : 1);
+      RecoveryAvailable.record(1, getLanguage(AST.getLangOpts()));
       return;
     }
   }
@@ -834,7 +847,7 @@
            .printToString(SM));
   Nodes = SelectionVisitor::collect(AST, Tokens, PrintPolicy, Begin, End, FID);
   Root = Nodes.empty() ? nullptr : &Nodes.front();
-  recordMetrics(*this);
+  recordMetrics(*this, AST);
   dlog("Built selection tree\n{0}", *this);
 }
 


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