1 files changed, 159 insertions, 0 deletions
diff --git a/compilerplugins/clang/test/referencecasting.cxx b/compilerplugins/clang/test/referencecasting.cxx
new file mode 100644
index 000000000..0272bc89c
--- /dev/null
+++ b/compilerplugins/clang/test/referencecasting.cxx
@@ -0,0 +1,159 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "sal/config.h"
+
+#include "com/sun/star/uno/XInterface.hpp"
+#include "com/sun/star/io/XStreamListener.hpp"
+#include "com/sun/star/lang/XTypeProvider.hpp"
+#include "com/sun/star/lang/XComponent.hpp"
+#include "cppuhelper/weak.hxx"
+
+void test1(const css::uno::Reference<css::io::XStreamListener>& a)
+{
+    // expected-error@+1 {{the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]}}
+    css::uno::Reference<css::lang::XEventListener> b(a, css::uno::UNO_QUERY);
+}
+
+namespace test2
+{
+css::uno::Reference<css::io::XStreamListener> getListener();
+
+void test()
+{
+    // expected-error@+1 {{the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]}}
+    css::uno::Reference<css::lang::XEventListener> b(getListener(), css::uno::UNO_QUERY);
+}
+}
+
+namespace test3
+{
+void callListener(css::uno::Reference<css::uno::XInterface> const&);
+
+void test(css::uno::Reference<css::io::XStreamListener> const& l)
+{
+    // expected-error@+1 {{the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]}}
+    callListener(css::uno::Reference<css::lang::XEventListener>(l, css::uno::UNO_QUERY));
+}
+}
+
+void test4(const css::uno::Reference<css::io::XStreamListener>& a)
+{
+    // no warning expected, used to reject null references
+    css::uno::Reference<css::lang::XEventListener> b(a, css::uno::UNO_SET_THROW);
+}
+
+// no warning expected
+namespace test5
+{
+void test(css::uno::Reference<css::io::XStreamListener> l)
+{
+    css::uno::Reference<css::uno::XInterface> a = l;
+}
+}
+
+namespace test6
+{
+void test(css::uno::Reference<css::io::XStreamListener> l)
+{
+    css::uno::Reference<css::lang::XEventListener> a;
+    // expected-error@+1 {{the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]}}
+    a.set(l, css::uno::UNO_QUERY);
+}
+}
+
+namespace test7
+{
+void test(css::uno::Reference<css::io::XStreamListener> l)
+{
+    // expected-error@+1 {{unnecessary get() call [loplugin:referencecasting]}}
+    css::uno::Reference<css::lang::XEventListener> a(l.get(), css::uno::UNO_QUERY);
+    // expected-error@+1 {{unnecessary get() call [loplugin:referencecasting]}}
+    a.set(l.get(), css::uno::UNO_QUERY);
+}
+}
+
+namespace test8
+{
+void test(css::io::XStreamListener* l)
+{
+    // expected-error@+1 {{the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]}}
+    css::uno::Reference<css::lang::XEventListener> a(l, css::uno::UNO_QUERY);
+    // expected-error@+1 {{the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]}}
+    a.set(l, css::uno::UNO_QUERY);
+}
+}
+
+// check for looking through casts
+namespace test9
+{
+class StatusbarController : public css::io::XStreamListener, public ::cppu::OWeakObject
+{
+};
+
+void test(StatusbarController* pController)
+{
+    css::uno::Reference<css::io::XStreamListener> xController;
+    // expected-error@+1 {{the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]}}
+    xController.set(static_cast<::cppu::OWeakObject*>(pController), css::uno::UNO_QUERY);
+}
+}
+
+// no warning expected when we have an ambiguous base
+namespace test10
+{
+class Foo : public css::lang::XTypeProvider, public css::lang::XComponent
+{
+    virtual ~Foo();
+    void bar()
+    {
+        css::uno::Reference<css::lang::XEventListener> xSource(
+            static_cast<css::lang::XTypeProvider*>(this), css::uno::UNO_QUERY);
+    }
+};
+}
+
+// no warning expected for SAL_NO_ACQUIRE
+namespace test11
+{
+void test(css::io::XStreamListener* l)
+{
+    css::uno::Reference<css::lang::XEventListener> a(l, SAL_NO_ACQUIRE);
+    a.set(l, SAL_NO_ACQUIRE);
+}
+}
+
+// no warning expected: querying for XInterface (instead of doing an upcast) has special semantics,
+// to check for UNO object equivalence.
+void test12(const css::uno::Reference<css::io::XStreamListener>& a)
+{
+    css::uno::Reference<css::uno::XInterface> b(a, css::uno::UNO_QUERY);
+}
+
+// no warning expected: querying for XInterface (instead of doing an upcast) has special semantics,
+// to check for UNO object equivalence.
+struct Test13
+{
+    css::uno::Reference<css::uno::XInterface> m_xNormalizedIFace;
+    void newObject(const css::uno::Reference<css::uno::XInterface>& _rxIFace)
+    {
+        m_xNormalizedIFace.set(_rxIFace, css::uno::UNO_QUERY);
+    }
+};
+
+void test14(css::uno::Sequence<css::uno::Reference<css::io::XStreamListener>> seq)
+{
+    for (sal_Int32 i = 0; i < seq.getLength(); ++i)
+    {
+        // expected-error@+1 {{the source reference is already a subtype of the destination reference, just use = [loplugin:referencecasting]}}
+        css::uno::Reference<css::io::XStreamListener> xDataSeries(seq[i], css::uno::UNO_QUERY);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */