[PATCH] D72119: [clangd] Handle DeducedTemplateSpecializationType in TargetFinder

[Nathan Ridge via Phabricator via cfe-commits]

nridge created this revision.
Herald added subscribers: cfe-commits, usaxena95, kadircet, arphaman, jkorous, MaskRay, ilya-biryukov.
Herald added a project: clang.

This is mostly a workaround for
https://bugs.llvm.org/show_bug.cgi?id=42914. Once that is fixed, the
handling in VisitDeducedTyped() should be sufficient.

Fixes https://github.com/clangd/clangd/issues/242


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72119

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


Index: clang-tools-extra/clangd/unittests/XRefsTests.cpp
===================================================================
--- clang-tools-extra/clangd/unittests/XRefsTests.cpp
+++ clang-tools-extra/clangd/unittests/XRefsTests.cpp
@@ -495,6 +495,16 @@
         void test(unique_ptr<S<T>>& V) {
           V->fo^o();
         }
+      )cpp",
+
+      R"cpp(// Class template argument deduction
+        template <typename T>
+        struct [[Test]] {
+          Test(T);
+        };
+        void foo() {
+          T^est a(5);
+        }
       )cpp"};
   for (const char *Test : Tests) {
     Annotations T(Test);
@@ -513,6 +523,7 @@
     // FIXME: Auto-completion in a template requires disabling delayed template
     // parsing.
     TU.ExtraArgs.push_back("-fno-delayed-template-parsing");
+    TU.ExtraArgs.push_back("-std=c++17");
 
     auto AST = TU.build();
     ASSERT_TRUE(AST.getDiagnostics().empty())
Index: clang-tools-extra/clangd/FindTarget.cpp
===================================================================
--- clang-tools-extra/clangd/FindTarget.cpp
+++ clang-tools-extra/clangd/FindTarget.cpp
@@ -315,6 +315,12 @@
         // TypeLoc never has a deduced type. https://llvm.org/PR42914
         Outer.add(DT->getDeducedType(), Flags | Rel::Underlying);
       }
+      void VisitDeducedTemplateSpecializationType(
+          const DeducedTemplateSpecializationType *DTST) {
+        if (auto *TD = DTST->getTemplateName().getAsTemplateDecl()) {
+          Outer.add(TD->getTemplatedDecl(), Flags | Rel::TemplatePattern);
+        }
+      }
       void VisitTypedefType(const TypedefType *TT) {
         Outer.add(TT->getDecl(), Flags);
       }


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