1 files changed, 146 insertions, 0 deletions
diff --git a/bridges/source/cpp_uno/shared/vtables.cxx b/bridges/source/cpp_uno/shared/vtables.cxx
new file mode 100644
index 000000000..9a7d7b376
--- /dev/null
+++ b/bridges/source/cpp_uno/shared/vtables.cxx
@@ -0,0 +1,146 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <vtables.hxx>
+
+#include <sal/types.h>
+#include <typelib/typedescription.h>
+
+#include <algorithm>
+#include <cassert>
+
+namespace
+{
+
+/**
+ *  Calculates the number of vtables associated with an interface type.
+ *
+ * <p>Multiple-inheritance C++ classes have more than one vtable.</p>
+ *
+ * @param type a non-null pointer to an interface type description
+ * @return the number of vtables associated with the given interface type
+ */
+sal_Int32 getVtableCount(typelib_InterfaceTypeDescription const * type) {
+    sal_Int32 n = 0;
+    for (sal_Int32 i = 0; i < type->nBaseTypes; ++i) {
+        n += getVtableCount(type->ppBaseTypes[i]);
+    }
+    return std::max< sal_Int32 >(n, 1);
+}
+
+/**
+ * Maps a local member index to a local function index.
+ *
+ * <p><em>Local</em> members/functions are those not inherited from any base
+ * types.  The number of <em>functions</em> is potentially larger than the
+ * number of <em>members</em>, as each read&ndash;write attribute member counts
+ * as two functions.</p>
+ *
+ * @param type a non-null pointer to an interface type description
+ * @param localMember a local member index, relative to the given interface type
+ * @return the local function index corresponding to the given local member
+ *     index, relative to the given interface type
+ */
+sal_Int32 mapLocalMemberToLocalFunction(
+    typelib_InterfaceTypeDescription * type, sal_Int32 localMember)
+{
+    typelib_typedescription_complete(
+        reinterpret_cast< typelib_TypeDescription ** >(&type));
+    sal_Int32 localMemberOffset = type->nAllMembers - type->nMembers;
+    sal_Int32 localFunctionOffset = type->nMapFunctionIndexToMemberIndex
+        - bridges::cpp_uno::shared::getLocalFunctions(type);
+    return type->pMapMemberIndexToFunctionIndex[localMemberOffset + localMember]
+        - localFunctionOffset;
+}
+
+// Since on Solaris we compile with --instances=static, getVtableSlot cannot be
+// a template function, with explicit instantiates for
+// T = typelib_InterfaceAttributeTypeDescription and
+// T = typelib_InterfaceMethodTypeDescription in this file; hence, there are two
+// overloaded versions of getVtableSlot that both delegate to this template
+// function:
+template< typename T > bridges::cpp_uno::shared::VtableSlot doGetVtableSlot(
+    T const * ifcMember)
+{
+    bridges::cpp_uno::shared::VtableSlot slot;
+    slot.offset = 0;
+    T * member = const_cast< T * >(ifcMember);
+    while (member->pBaseRef != nullptr) {
+        assert(member->nIndex < member->pInterface->nBaseTypes);
+        for (sal_Int32 i = 0; i < member->nIndex; ++i) {
+            slot.offset += getVtableCount(member->pInterface->ppBaseTypes[i]);
+        }
+        typelib_TypeDescription * desc = nullptr;
+        typelib_typedescriptionreference_getDescription(
+            &desc, member->pBaseRef);
+        assert(
+            desc != nullptr && desc->eTypeClass == member->aBase.aBase.eTypeClass);
+        if (member != ifcMember) {
+            typelib_typedescription_release(&member->aBase.aBase);
+        }
+        member = reinterpret_cast< T * >(desc);
+    }
+    slot.index
+        = bridges::cpp_uno::shared::getPrimaryFunctions(
+            member->pInterface->pBaseTypeDescription)
+        + mapLocalMemberToLocalFunction(member->pInterface, member->nIndex);
+    if (member != ifcMember) {
+        typelib_typedescription_release(&member->aBase.aBase);
+    }
+    return slot;
+}
+
+}
+
+namespace bridges::cpp_uno::shared {
+
+sal_Int32 getLocalFunctions(typelib_InterfaceTypeDescription const * type) {
+    return type->nMembers == 0
+        ? 0
+        : (type->nMapFunctionIndexToMemberIndex
+           - type->pMapMemberIndexToFunctionIndex[
+               type->nAllMembers - type->nMembers]);
+}
+
+sal_Int32 getPrimaryFunctions(typelib_InterfaceTypeDescription * type) {
+    sal_Int32 n = 0;
+    for (; type != nullptr; type = type->pBaseTypeDescription) {
+        typelib_typedescription_complete(
+            reinterpret_cast< typelib_TypeDescription ** >(&type));
+        n += getLocalFunctions(type);
+    }
+    return n;
+}
+
+VtableSlot getVtableSlot(
+    typelib_InterfaceAttributeTypeDescription const * ifcMember)
+{
+    return doGetVtableSlot(ifcMember);
+}
+
+VtableSlot getVtableSlot(
+    typelib_InterfaceMethodTypeDescription const * ifcMember)
+{
+    return doGetVtableSlot(ifcMember);
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */