[PATCH] D134827: [clangd] Avoid recursion on UnresolvedUsingValueDecl during semantic highlighting

[Nathan Ridge via Phabricator via cfe-commits]

nridge updated this revision to Diff 506359.
nridge added a comment.

add test case


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D134827/new/

https://reviews.llvm.org/D134827

Files:
  clang-tools-extra/clangd/SemanticHighlighting.cpp
  clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp


Index: clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
+++ clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
@@ -942,7 +942,15 @@
           auto $LocalVariable_def[[s]] = $Operator[[new]] 
$Class[[Foo]]<$TemplateParameter[[T]]>();
           $Operator[[delete]] $LocalVariable[[s]];
         }
-      )cpp"};
+      )cpp",
+      // Recursive UsingValueDecl
+      R"cpp(
+        template <int> class $Class_def[[X]] {
+          template <int> class $Class_def[[Y]] {
+            using $Class[[Y]]<0>::$Unknown_dependentName[[xxx]];
+          };
+        };
+    )cpp"};
   for (const auto &TestCase : TestCases)
     // Mask off scope modifiers to keep the tests manageable.
     // They're tested separately.
Index: clang-tools-extra/clangd/SemanticHighlighting.cpp
===================================================================
--- clang-tools-extra/clangd/SemanticHighlighting.cpp
+++ clang-tools-extra/clangd/SemanticHighlighting.cpp
@@ -156,7 +156,7 @@
     return HighlightingKind::Concept;
   if (const auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(D)) {
     auto Targets = Resolver->resolveUsingValueDecl(UUVD);
-    if (!Targets.empty()) {
+    if (!Targets.empty() && Targets[0] != UUVD) {
       return kindForDecl(Targets[0], Resolver);
     }
     return HighlightingKind::Unknown;



Index: clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
+++ clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp
@@ -942,7 +942,15 @@
           auto $LocalVariable_def[[s]] = $Operator[[new]] $Class[[Foo]]<$TemplateParameter[[T]]>();
           $Operator[[delete]] $LocalVariable[[s]];
         }
-      )cpp"};
+      )cpp",
+      // Recursive UsingValueDecl
+      R"cpp(
+        template <int> class $Class_def[[X]] {
+          template <int> class $Class_def[[Y]] {
+            using $Class[[Y]]<0>::$Unknown_dependentName[[xxx]];
+          };
+        };
+    )cpp"};
   for (const auto &TestCase : TestCases)
     // Mask off scope modifiers to keep the tests manageable.
     // They're tested separately.
Index: clang-tools-extra/clangd/SemanticHighlighting.cpp
===================================================================
--- clang-tools-extra/clangd/SemanticHighlighting.cpp
+++ clang-tools-extra/clangd/SemanticHighlighting.cpp
@@ -156,7 +156,7 @@
     return HighlightingKind::Concept;
   if (const auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(D)) {
     auto Targets = Resolver->resolveUsingValueDecl(UUVD);
-    if (!Targets.empty()) {
+    if (!Targets.empty() && Targets[0] != UUVD) {
       return kindForDecl(Targets[0], Resolver);
     }
     return HighlightingKind::Unknown;

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