bridges/source/cpp_uno/shared/vtables.cxx

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  28
  29
  30 #include "bridges/cpp_uno/shared/vtables.hxx"
  31
  32 #include "osl/diagnose.h"
  33 #include "sal/types.h"
  34 #include "typelib/typedescription.h"
  35
  36 #include <algorithm>
  37
  38 namespace
  39 {
  40
  41 /**
  42  *  Calculates the number of vtables associated with an interface type.
  43  *
  44  * <p>Multiple-inheritance C++ classes have more than one vtable.</p>
  45  *
  46  * @param type a non-null pointer to an interface type description
  47  * @return the number of vtables associated with the given interface type
  48  */
  49 sal_Int32 getVtableCount(typelib_InterfaceTypeDescription const * type) {
  50     sal_Int32 n = 0;
  51     for (sal_Int32 i = 0; i < type->nBaseTypes; ++i) {
  52         n += getVtableCount(type->ppBaseTypes[i]);
  53     }
  54     return std::max< sal_Int32 >(n, 1);
  55 }
  56
  57 /**
  58  * Maps a local member index to a local function index.
  59  *
  60  * <p><em>Local</em> members/functions are those not inherited from any base
  61  * types.  The number of <em>functions</em> is potentially larger than the
  62  * number of <em>members</em>, as each read&ndash;write attribute member counts
  63  * as two functions.</p>
  64  *
  65  * @param type a non-null pointer to an interface type description
  66  * @param localMember a local member index, relative to the given interface type
  67  * @return the local function index corresponding to the given local member
  68  *     index, relative to the given interface type
  69  */
  70 sal_Int32 mapLocalMemberToLocalFunction(
  71     typelib_InterfaceTypeDescription * type, sal_Int32 localMember)
  72 {
  73     typelib_typedescription_complete(
  74         reinterpret_cast< typelib_TypeDescription ** >(&type));
  75     sal_Int32 localMemberOffset = type->nAllMembers - type->nMembers;
  76     sal_Int32 localFunctionOffset = type->nMapFunctionIndexToMemberIndex
  77         - bridges::cpp_uno::shared::getLocalFunctions(type);
  78     return type->pMapMemberIndexToFunctionIndex[localMemberOffset + localMember]
  79         - localFunctionOffset;
  80 }
  81
  82 // Since on Solaris we compile with --instances=static, getVtableSlot cannot be
  83 // a template function, with explicit instantiates for
  84 // T = typelib_InterfaceAttributeTypeDescription and
  85 // T = typelib_InterfaceMethodTypeDescription in this file; hence, there are two
  86 // overloaded versions of getVtableSlot that both delegate to this template
  87 // function:
  88 template< typename T > bridges::cpp_uno::shared::VtableSlot doGetVtableSlot(
  89     T const * ifcMember)
  90 {
  91     bridges::cpp_uno::shared::VtableSlot slot;
  92     slot.offset = 0;
  93     T * member = const_cast< T * >(ifcMember);
  94     while (member->pBaseRef != 0) {
  95         OSL_ASSERT(member->nIndex < member->pInterface->nBaseTypes);
  96         for (sal_Int32 i = 0; i < member->nIndex; ++i) {
  97             slot.offset += getVtableCount(member->pInterface->ppBaseTypes[i]);
  98         }
  99         typelib_TypeDescription * desc = 0;
 100         typelib_typedescriptionreference_getDescription(
 101             &desc, member->pBaseRef);
 102         OSL_ASSERT(
 103             desc != 0 && desc->eTypeClass == member->aBase.aBase.eTypeClass);
 104         if (member != ifcMember) {
 105             typelib_typedescription_release(&member->aBase.aBase);
 106         }
 107         member = reinterpret_cast< T * >(desc);
 108     }
 109     slot.index
 110         = bridges::cpp_uno::shared::getPrimaryFunctions(
 111             member->pInterface->pBaseTypeDescription)
 112         + mapLocalMemberToLocalFunction(member->pInterface, member->nIndex);
 113     if (member != ifcMember) {
 114         typelib_typedescription_release(&member->aBase.aBase);
 115     }
 116     return slot;
 117 }
 118
 119 }
 120
 121 namespace bridges { namespace cpp_uno { namespace shared {
 122
 123 sal_Int32 getLocalFunctions(typelib_InterfaceTypeDescription const * type) {
 124     return type->nMembers == 0
 125         ? 0
 126         : (type->nMapFunctionIndexToMemberIndex
 127            - type->pMapMemberIndexToFunctionIndex[
 128                type->nAllMembers - type->nMembers]);
 129 }
 130
 131 sal_Int32 getPrimaryFunctions(typelib_InterfaceTypeDescription * type) {
 132     sal_Int32 n = 0;
 133     for (; type != 0; type = type->pBaseTypeDescription) {
 134         typelib_typedescription_complete(
 135             reinterpret_cast< typelib_TypeDescription ** >(&type));
 136         n += getLocalFunctions(type);
 137     }
 138     return n;
 139 }
 140
 141 VtableSlot getVtableSlot(
 142     typelib_InterfaceAttributeTypeDescription const * ifcMember)
 143 {
 144     return doGetVtableSlot(ifcMember);
 145 }
 146
 147 VtableSlot getVtableSlot(
 148     typelib_InterfaceMethodTypeDescription const * ifcMember)
 149 {
 150     return doGetVtableSlot(ifcMember);
 151 }
 152
 153 } } }
 154
 155 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */