[clang-rename] Add the USR of incomplete decl to the USRSet.

Summary:
This fixes a clangd rename issue, which is missing the reference of
an incomplete specialization.

Unfortunately, I didn't reproduce this issue in clang-rename, I guess
the input `FoundDecl` of AdditionalUSRFinder is different in clangd vs
clang-rename, clang-rename uses the underlying CXXRecordDecl of the
ClassTemplateDecl, which is fixed in https://github.com/llvm/llvm-project/commit/5d862c042b52ae2aad37471d0b83b6c678a520e3;
while clangd-rename uses the ClassTemplateDecl.

Reviewers: kbobyrev

Reviewed By: kbobyrev

Subscribers: ilya-biryukov, jkorous, arphaman, kadircet, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D74829

diff --git a/clang-tools-extra/clangd/unittests/RenameTests.cpp b/clang-tools-extra/clangd/unittests/RenameTests.cpp
index aa08be4..82930eb 100644 (file)
--- a/clang-tools-extra/clangd/unittests/RenameTests.cpp
+++ b/clang-tools-extra/clangd/unittests/RenameTests.cpp
@@ -202,6 +202,13 @@ TEST(RenameTest, WithinFileRename) {
         }
       )cpp",
 
+      // Incomplete class specializations
+      R"cpp(
+        template <typename T>
+        class [[Fo^o]] {};
+        void func([[Foo]]<int>);
+      )cpp",
+
       // Template class instantiations.
       R"cpp(
         template <typename T>

diff --git a/clang/lib/Tooling/Refactoring/Rename/USRFindingAction.cpp b/clang/lib/Tooling/Refactoring/Rename/USRFindingAction.cpp
index a17b880..43dc32e 100644 (file)
--- a/clang/lib/Tooling/Refactoring/Rename/USRFindingAction.cpp
+++ b/clang/lib/Tooling/Refactoring/Rename/USRFindingAction.cpp
@@ -126,12 +126,14 @@ private:
     addUSRsOfCtorDtors(TemplateDecl->getTemplatedDecl());
   }
 
-  void addUSRsOfCtorDtors(const CXXRecordDecl *RecordDecl) {
-    RecordDecl = RecordDecl->getDefinition();
+  void addUSRsOfCtorDtors(const CXXRecordDecl *RD) {
+    const auto* RecordDecl = RD->getDefinition();
 
     // Skip if the CXXRecordDecl doesn't have definition.
-    if (!RecordDecl)
+    if (!RecordDecl) {
+      USRSet.insert(getUSRForDecl(RD));
       return;
+    }
 
     for (const auto *CtorDecl : RecordDecl->ctors())
       USRSet.insert(getUSRForDecl(CtorDecl));