[PATCH] D85503: [clangd] Have template template arguments target their referenced template decl

[Nathan Ridge via Phabricator via cfe-commits]

nridge updated this revision to Diff 284245.
nridge added a comment.

Address review comments


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D85503/new/

https://reviews.llvm.org/D85503

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


Index: clang-tools-extra/clangd/unittests/FindTargetTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/FindTargetTests.cpp
+++ clang-tools-extra/clangd/unittests/FindTargetTests.cpp
@@ -376,6 +376,14 @@
                {"template<> class Foo<int *>", Rel::TemplateInstantiation},
                {"template <typename T> class Foo<T *>", Rel::TemplatePattern});
 
+  Code = R"cpp(
+    // Default argument of template template parameter.
+    template<typename T> struct Vector {};
+    template <template <typename> class Container = [[Vector]]>
+    struct A {};
+  )cpp";
+  EXPECT_DECLS("TemplateArgumentLoc", {"template <typename T> struct Vector"});
+
   Flags.push_back("-std=c++17"); // for CTAD tests
 
   Code = R"cpp(
Index: clang-tools-extra/clangd/Selection.cpp
===================================================================
--- clang-tools-extra/clangd/Selection.cpp
+++ clang-tools-extra/clangd/Selection.cpp
@@ -479,6 +479,10 @@
   bool TraverseTypeLoc(TypeLoc X) {
     return traverseNode(&X, [&] { return Base::TraverseTypeLoc(X); });
   }
+  bool TraverseTemplateArgumentLoc(const TemplateArgumentLoc &X) {
+    return traverseNode(&X,
+                        [&] { return Base::TraverseTemplateArgumentLoc(X); });
+  }
   bool TraverseNestedNameSpecifierLoc(NestedNameSpecifierLoc X) {
     return traverseNode(
         &X, [&] { return Base::TraverseNestedNameSpecifierLoc(X); });
Index: clang-tools-extra/clangd/FindTarget.cpp
===================================================================
--- clang-tools-extra/clangd/FindTarget.cpp
+++ clang-tools-extra/clangd/FindTarget.cpp
@@ -590,6 +590,19 @@
       add(CCI->getAnyMember(), Flags);
     // Constructor calls contain a TypeLoc node, so we don't handle them here.
   }
+
+  void add(const TemplateArgument &Arg, RelSet Flags) {
+    // Only used for template template arguments.
+    // For type and non-type template arguments, SelectionTree
+    // will hit a more specific node (e.g. a TypeLoc or a
+    // DeclRefExpr).
+    if (Arg.getKind() == TemplateArgument::Template ||
+        Arg.getKind() == TemplateArgument::TemplateExpansion) {
+      if (TemplateDecl *TD = Arg.getAsTemplate().getAsTemplateDecl()) {
+        report(TD, Flags);
+      }
+    }
+  }
 };
 
 } // namespace
@@ -613,6 +626,8 @@
     Finder.add(*QT, Flags);
   else if (const CXXCtorInitializer *CCI = N.get<CXXCtorInitializer>())
     Finder.add(CCI, Flags);
+  else if (const TemplateArgumentLoc *TAL = N.get<TemplateArgumentLoc>())
+    Finder.add(TAL->getArgument(), Flags);
 
   return Finder.takeDecls();
 }


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