[PATCH] D57910: [ASTImporter] Find previous friend function template

[Gabor Marton via Phabricator via cfe-commits]

martong created this revision.
martong added reviewers: a_sidorin, shafik.
Herald added subscribers: cfe-commits, gamesh411, Szelethus, dkrupp, rnkovacs.
Herald added a reviewer: a.sidorin.
Herald added a project: clang.

Repository:
  rC Clang

https://reviews.llvm.org/D57910

Files:
  lib/AST/ASTImporter.cpp
  unittests/AST/ASTImporterTest.cpp


Index: unittests/AST/ASTImporterTest.cpp
===================================================================
--- unittests/AST/ASTImporterTest.cpp
+++ unittests/AST/ASTImporterTest.cpp
@@ -5083,6 +5083,33 @@
     ParameterizedTests, CanonicalRedeclChain,
     ::testing::Values(ArgVector()),);
 
+struct ImportFriendFunctionTemplates : ASTImporterOptionSpecificTestBase {};
+
+TEST_P(ImportFriendFunctionTemplates, LookupShouldFindPreviousFriend) {
+  Decl *ToTU = getToTuDecl(
+      R"(
+      class X {
+        template <typename T> friend void foo();
+      };
+      )",
+      Lang_CXX);
+  auto *Friend = FirstDeclMatcher<FunctionTemplateDecl>().match(
+      ToTU, functionTemplateDecl(hasName("foo")));
+
+  Decl *FromTU = getTuDecl(
+      R"(
+      template <typename T> void foo();
+      )",
+      Lang_CXX);
+  auto *FromFoo = FirstDeclMatcher<FunctionTemplateDecl>().match(
+      FromTU, functionTemplateDecl(hasName("foo")));
+  auto *Imported = Import(FromFoo, Lang_CXX);
+
+  // Currently chains of FunctionTemplateDecls are not implemented
+  //EXPECT_EQ(Imported->getPreviousDecl(), Friend);
+  EXPECT_EQ(Imported, Friend);
+}
+
 INSTANTIATE_TEST_CASE_P(ParameterizedTests, ASTImporterLookupTableTest,
                         DefaultTestValuesForRunOptions, );
 
@@ -5101,6 +5128,9 @@
 INSTANTIATE_TEST_CASE_P(ParameterizedTests, ImportFunctions,
                         DefaultTestValuesForRunOptions, );
 
+INSTANTIATE_TEST_CASE_P(ParameterizedTests, ImportFriendFunctionTemplates,
+                        DefaultTestValuesForRunOptions, );
+
 INSTANTIATE_TEST_CASE_P(ParameterizedTests, ImportClasses,
                         DefaultTestValuesForRunOptions, );
 
Index: lib/AST/ASTImporter.cpp
===================================================================
--- lib/AST/ASTImporter.cpp
+++ lib/AST/ASTImporter.cpp
@@ -5529,7 +5529,7 @@
   // Try to find a function in our own ("to") context with the same name, same
   // type, and in the same context as the function we're importing.
   if (!LexicalDC->isFunctionOrMethod()) {
-    unsigned IDNS = Decl::IDNS_Ordinary;
+    unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_OrdinaryFriend;
     auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
     for (auto *FoundDecl : FoundDecls) {
       if (!FoundDecl->isInIdentifierNamespace(IDNS))


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