1 /**************************************************************
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 *
20 *************************************************************/
21
22
23
24 // MARKER(update_precomp.py): autogen include statement, do not remove
25 #include "precompiled_bridges.hxx"
26
27 #include "bridges/cpp_uno/shared/vtables.hxx"
28
29 #include "osl/diagnose.h"
30 #include "sal/types.h"
31 #include "typelib/typedescription.h"
32
33 #include <algorithm>
34
35 namespace
36 {
37
38 /**
39 * Calculates the number of vtables associated with an interface type.
40 *
41 * <p>Multiple-inheritance C++ classes have more than one vtable.</p>
42 *
43 * @param type a non-null pointer to an interface type description
44 * @return the number of vtables associated with the given interface type
45 */
getVtableCount(typelib_InterfaceTypeDescription const * type)46 sal_Int32 getVtableCount(typelib_InterfaceTypeDescription const * type) {
47 sal_Int32 n = 0;
48 for (sal_Int32 i = 0; i < type->nBaseTypes; ++i) {
49 n += getVtableCount(type->ppBaseTypes[i]);
50 }
51 return std::max< sal_Int32 >(n, 1);
52 }
53
54 /**
55 * Maps a local member index to a local function index.
56 *
57 * <p><em>Local</em> members/functions are those not inherited from any base
58 * types. The number of <em>functions</em> is potentially larger than the
59 * number of <em>members</em>, as each read–write attribute member counts
60 * as two functions.</p>
61 *
62 * @param type a non-null pointer to an interface type description
63 * @param localMember a local member index, relative to the given interface type
64 * @return the local function index corresponding to the given local member
65 * index, relative to the given interface type
66 */
mapLocalMemberToLocalFunction(typelib_InterfaceTypeDescription * type,sal_Int32 localMember)67 sal_Int32 mapLocalMemberToLocalFunction(
68 typelib_InterfaceTypeDescription * type, sal_Int32 localMember)
69 {
70 typelib_typedescription_complete(
71 reinterpret_cast< typelib_TypeDescription ** >(&type));
72 sal_Int32 localMemberOffset = type->nAllMembers - type->nMembers;
73 sal_Int32 localFunctionOffset = type->nMapFunctionIndexToMemberIndex
74 - bridges::cpp_uno::shared::getLocalFunctions(type);
75 return type->pMapMemberIndexToFunctionIndex[localMemberOffset + localMember]
76 - localFunctionOffset;
77 }
78
79 // Since on Solaris we compile with --instances=static, getVtableSlot cannot be
80 // a template function, with explicit instantiates for
81 // T = typelib_InterfaceAttributeTypeDescription and
82 // T = typelib_InterfaceMethodTypeDescription in this file; hence, there are two
83 // overloaded versions of getVtableSlot that both delegate to this template
84 // function:
doGetVtableSlot(T const * ifcMember)85 template< typename T > bridges::cpp_uno::shared::VtableSlot doGetVtableSlot(
86 T const * ifcMember)
87 {
88 bridges::cpp_uno::shared::VtableSlot slot;
89 slot.offset = 0;
90 T * member = const_cast< T * >(ifcMember);
91 while (member->pBaseRef != 0) {
92 OSL_ASSERT(member->nIndex < member->pInterface->nBaseTypes);
93 for (sal_Int32 i = 0; i < member->nIndex; ++i) {
94 slot.offset += getVtableCount(member->pInterface->ppBaseTypes[i]);
95 }
96 typelib_TypeDescription * desc = 0;
97 typelib_typedescriptionreference_getDescription(
98 &desc, member->pBaseRef);
99 OSL_ASSERT(
100 desc != 0 && desc->eTypeClass == member->aBase.aBase.eTypeClass);
101 if (member != ifcMember) {
102 typelib_typedescription_release(&member->aBase.aBase);
103 }
104 member = reinterpret_cast< T * >(desc);
105 }
106 slot.index
107 = bridges::cpp_uno::shared::getPrimaryFunctions(
108 member->pInterface->pBaseTypeDescription)
109 + mapLocalMemberToLocalFunction(member->pInterface, member->nIndex);
110 if (member != ifcMember) {
111 typelib_typedescription_release(&member->aBase.aBase);
112 }
113 return slot;
114 }
115
116 }
117
118 namespace bridges { namespace cpp_uno { namespace shared {
119
getLocalFunctions(typelib_InterfaceTypeDescription const * type)120 sal_Int32 getLocalFunctions(typelib_InterfaceTypeDescription const * type) {
121 return type->nMembers == 0
122 ? 0
123 : (type->nMapFunctionIndexToMemberIndex
124 - type->pMapMemberIndexToFunctionIndex[
125 type->nAllMembers - type->nMembers]);
126 }
127
getPrimaryFunctions(typelib_InterfaceTypeDescription * type)128 sal_Int32 getPrimaryFunctions(typelib_InterfaceTypeDescription * type) {
129 sal_Int32 n = 0;
130 for (; type != 0; type = type->pBaseTypeDescription) {
131 typelib_typedescription_complete(
132 reinterpret_cast< typelib_TypeDescription ** >(&type));
133 n += getLocalFunctions(type);
134 }
135 return n;
136 }
137
getVtableSlot(typelib_InterfaceAttributeTypeDescription const * ifcMember)138 VtableSlot getVtableSlot(
139 typelib_InterfaceAttributeTypeDescription const * ifcMember)
140 {
141 return doGetVtableSlot(ifcMember);
142 }
143
getVtableSlot(typelib_InterfaceMethodTypeDescription const * ifcMember)144 VtableSlot getVtableSlot(
145 typelib_InterfaceMethodTypeDescription const * ifcMember)
146 {
147 return doGetVtableSlot(ifcMember);
148 }
149
150 } } }
151