[find-all-symbols] Index partial template specializations.

Summary:
Fix no std::function index.

Previously, we don't index all the template specialization declarations of functions and classes (Because we assume that template functions/classes are indexed by their template declarations), but this is not always true in some cases like `std::function` which only has a partial template specialization declaration.

Reviewers: ioeric, bkramer

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D27920

llvm-svn: 291669

2 files changed, 36 insertions, 4 deletions

diff --git a/clang-tools-extra/include-fixer/find-all-symbols/FindAllSymbols.cpp b/clang-tools-extra/include-fixer/find-all-symbols/FindAllSymbols.cpp
index d37918fef55..96bf992c9a5 100644
--- a/clang-tools-extra/include-fixer/find-all-symbols/FindAllSymbols.cpp
+++ b/clang-tools-extra/include-fixer/find-all-symbols/FindAllSymbols.cpp
@@ -32,6 +32,18 @@ AST_MATCHER(EnumConstantDecl, isInScopedEnum) {
   return false;
 }
 
+AST_POLYMORPHIC_MATCHER(isFullySpecialized,
+                        AST_POLYMORPHIC_SUPPORTED_TYPES(FunctionDecl, VarDecl,
+                                                        CXXRecordDecl)) {
+  if (Node.getTemplateSpecializationKind() == TSK_ExplicitSpecialization) {
+    bool IsPartialSpecialization =
+        llvm::isa<VarTemplatePartialSpecializationDecl>(Node) ||
+        llvm::isa<ClassTemplatePartialSpecializationDecl>(Node);
+    return !IsPartialSpecialization;
+  }
+  return false;
+}
+
 std::vector<SymbolInfo::Context> GetContexts(const NamedDecl *ND) {
   std::vector<SymbolInfo::Context> Contexts;
   for (const auto *Context = ND->getDeclContext(); Context;
@@ -126,8 +138,7 @@ void FindAllSymbols::registerMatchers(MatchFinder *MatchFinder) {
   auto CCMatcher =
       allOf(HasNSOrTUCtxMatcher, unless(IsInSpecialization),
             unless(ast_matchers::isTemplateInstantiation()),
-            unless(isInstantiated()), unless(classTemplateSpecializationDecl()),
-            unless(isExplicitTemplateSpecialization()));
+            unless(isInstantiated()), unless(isFullySpecialized()));
 
   // Matchers specific to code in extern "C" {...}.
   auto ExternCMatcher = hasDeclContext(linkageSpecDecl());
@@ -156,8 +167,7 @@ void FindAllSymbols::registerMatchers(MatchFinder *MatchFinder) {
 
   // Matchers for C++ record declarations.
   auto CxxRecordDecl =
-      cxxRecordDecl(CommonFilter, CCMatcher, isDefinition(),
-                    unless(isExplicitTemplateSpecialization()));
+      cxxRecordDecl(CommonFilter, CCMatcher, isDefinition());
   MatchFinder->addMatcher(CxxRecordDecl.bind("decl"), this);
 
   // Matchers for function declarations.
diff --git a/clang-tools-extra/unittests/include-fixer/find-all-symbols/FindAllSymbolsTests.cpp b/clang-tools-extra/unittests/include-fixer/find-all-symbols/FindAllSymbolsTests.cpp
index baa5dca463f..852fe148de1 100644
--- a/clang-tools-extra/unittests/include-fixer/find-all-symbols/FindAllSymbolsTests.cpp
+++ b/clang-tools-extra/unittests/include-fixer/find-all-symbols/FindAllSymbolsTests.cpp
@@ -229,6 +229,28 @@ TEST_F(FindAllSymbolsTest, CXXRecordSymbolsTemplate) {
   EXPECT_TRUE(hasSymbol(Symbol));
 }
 
+TEST_F(FindAllSymbolsTest, DontIgnoreTemplatePartialSpecialization) {
+  static const char Code[] = R"(
+      template<class> class Class; // undefined
+      template<class R, class... ArgTypes>
+      class Class<R(ArgTypes...)> {
+      };
+
+      template<class T> void f() {};
+      template<> void f<int>() {};
+      )";
+  runFindAllSymbols(Code);
+  SymbolInfo Symbol =
+      SymbolInfo("Class", SymbolInfo::SymbolKind::Class, HeaderName, 4, {});
+  EXPECT_TRUE(hasSymbol(Symbol));
+  Symbol =
+      SymbolInfo("f", SymbolInfo::SymbolKind::Function, HeaderName, 7, {});
+  EXPECT_TRUE(hasSymbol(Symbol));
+  Symbol =
+      SymbolInfo("f", SymbolInfo::SymbolKind::Function, HeaderName, 8, {});
+  EXPECT_FALSE(hasSymbol(Symbol));
+}
+
 TEST_F(FindAllSymbolsTest, FunctionSymbols) {
   static const char Code[] = R"(
       namespace na {