C++: fix cloning of templates

Fix instantiation of templates(by cloning original symbols). Assigning of scope
for cloned symbol is taken from the symbol which is used to instantiate.

Task-number: QTCREATORBUG-9098
Change-Id: I066cc8b5f69333fabdaf2d4466b205baf08bd3f1
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/libs/3rdparty/cplusplus/Symbol.cpp

@@ -105,7 +105,7 @@ Symbol::Symbol(TranslationUnit *translationUnit, unsigned sourceLocation, const
 
 Symbol::Symbol(Clone *clone, Subst *subst, Symbol *original)
     : _name(clone->name(original->_name, subst)),
-      _scope(original->_scope),
+      _scope(0),
       _next(0),
       _fileId(clone->control()->stringLiteral(original->fileName(), original->fileNameLength())),
       _sourceLocation(original->_sourceLocation),
@@ -296,6 +296,11 @@ Block *Symbol::enclosingBlock() const
     return 0;
 }
 
+Scope *Symbol::scope() const
+{
+    return _scope;
+}
+
 unsigned Symbol::index() const
 { return _index; }
 

src/libs/3rdparty/cplusplus/Symbol.h

@@ -290,6 +290,7 @@ public:
     /// Returns the enclosing Block scope.
     Block *enclosingBlock() const;
 
+    Scope *scope() const;
     void setScope(Scope *enclosingScope); // ### make me private
     void resetScope(); // ### make me private
     void setSourceLocation(unsigned sourceLocation, TranslationUnit *translationUnit); // ### make me private

src/libs/cplusplus/LookupContext.cpp

@@ -936,6 +936,7 @@ ClassOrNamespace *ClassOrNamespace::nestedType(const Name *name, ClassOrNamespac
 
                 foreach (Symbol *s, reference->symbols()) {
                     Symbol *clone = cloner.symbol(s, &subst);
+                    clone->setScope(s->scope());
                     instantiation->_symbols.append(clone);
 #ifdef DEBUG_LOOKUP
                     Overview oo;oo.showFunctionSignatures = true;
@@ -1089,6 +1090,7 @@ void ClassOrNamespace::NestedClassInstantiator::instantiate(ClassOrNamespace *en
 
             foreach (Symbol *s, nestedClassOrNamespace->_symbols) {
                 Symbol *clone = _cloner.symbol(s, &_subst);
+                clone->setScope(s->scope());
                 nestedClassOrNamespaceInstantiation->_symbols.append(clone);
             }
         }

src/plugins/cpptools/cppcompletion_test.cpp

@@ -1843,3 +1843,42 @@ void CppToolsPlugin::test_completion_namespace_alias_with_many_namespace_declara
     QVERIFY(completions.contains(QLatin1String("Foo1")));
     QVERIFY(completions.contains(QLatin1String("Foo2")));
 }
+
+void CppToolsPlugin::test_completion_QTCREATORBUG9098()
+{
+    TestData data;
+    data.srcText =
+            "template <typename T>\n"
+            "class B\n"
+            "{\n"
+            "public:\n"
+            "    C<T> c;\n"
+            "};\n"
+            "template <typename T>\n"
+            "class A\n"
+            "{\n"
+            "public:\n"
+            "    B<T> b;\n"
+            "    void fun()\n"
+            "    {\n"
+            "       @\n"
+            "       // padding so we get the scope right\n"
+            "    }\n"
+            "};\n"
+
+            ;
+    setup(&data);
+
+    Utils::ChangeSet change;
+    QString txt = QLatin1String("b.");
+    change.insert(data.pos, txt);
+    QTextCursor cursor(data.doc);
+    change.apply(&cursor);
+    data.pos += txt.length();
+
+    QStringList completions = getCompletions(data);
+
+    QCOMPARE(completions.size(), 2);
+    QVERIFY(completions.contains(QLatin1String("c")));
+    QVERIFY(completions.contains(QLatin1String("B")));
+}

src/plugins/cpptools/cpptoolsplugin.h

@@ -123,6 +123,7 @@ private slots:
     void test_completion_typedef_using_templates1();
     void test_completion_typedef_using_templates2();
     void test_completion_namespace_alias_with_many_namespace_declarations();
+    void test_completion_QTCREATORBUG9098();
 
     void test_format_pointerdeclaration_in_simpledeclarations();
     void test_format_pointerdeclaration_in_simpledeclarations_data();

tests/auto/cplusplus/checksymbols/tst_checksymbols.cpp

@@ -185,6 +185,7 @@ private slots:
     void test_checksymbols_QTCREATORBUG8974_danglingPointer();
     void operatorAsteriskOfNestedClassOfTemplateClass_QTCREATORBUG9006();
     void test_checksymbols_templated_functions();
+    void test_checksymbols_QTCREATORBUG9098();
 };
 
 void tst_CheckSymbols::test_checksymbols_TypeUse()
@@ -1415,6 +1416,44 @@ void tst_CheckSymbols::test_checksymbols_templated_functions()
         << Use(6, 17, 1, SemanticInfo::TypeUse)
         ;
 
+}
+
+void tst_CheckSymbols::test_checksymbols_QTCREATORBUG9098()
+{
+    const QByteArray source =
+            "template <typename T>\n"
+            "class B\n"
+            "{\n"
+            "public:\n"
+            "    C<T> c;\n"
+            "};\n"
+            "template <typename T>\n"
+            "class A\n"
+            "{\n"
+            "public:\n"
+            "    B<T> b;\n"
+            "    void fun()\n"
+            "    {\n"
+            "        b.c;\n"
+            "    }\n"
+            "}\n"
+            ;
+
+    const QList<Use> expectedUses = QList<Use>()
+            << Use(1, 20, 1, SemanticInfo::TypeUse)
+            << Use(2, 7, 1, SemanticInfo::TypeUse)
+            << Use(5, 7, 1, SemanticInfo::TypeUse)
+            << Use(5, 10, 1, SemanticInfo::FieldUse)
+            << Use(7, 20, 1, SemanticInfo::TypeUse)
+            << Use(8, 7, 1, SemanticInfo::TypeUse)
+            << Use(11, 5, 1, SemanticInfo::TypeUse)
+            << Use(11, 7, 1, SemanticInfo::TypeUse)
+            << Use(11, 10, 1, SemanticInfo::FieldUse)
+            << Use(12, 10, 3, SemanticInfo::FunctionUse)
+            << Use(14, 9, 1, SemanticInfo::FieldUse)
+            << Use(14, 11, 1, SemanticInfo::FieldUse)
+            ;
+
     TestData::check(source, expectedUses);
 }