INTEGRATION: CWS ooo11rc2 (1.1.4); FILE ADDED

2003/07/14 15:35:35 fa 1.1.4.1: Add gcc3 C++ <-> UNO bridge code for OS X and conditionalize the old gcc 2
bridge code for gcc 2.95 only.

http://www.openoffice.org/project/www/issues/show_bug.cgi?id=16616

Contributors:
Kevin Hendricks
Dan Williams

Dan
fa@ooo

1 files changed, 841 insertions, 0 deletions

diff --git a/bridges/source/cpp_uno/gcc3_macosx_powerpc/cpp2uno.cxx b/bridges/source/cpp_uno/gcc3_macosx_powerpc/cpp2uno.cxx
new file mode 100644
index 000000000000..f56d59c5e6b0
--- /dev/null
+++ b/bridges/source/cpp_uno/gcc3_macosx_powerpc/cpp2uno.cxx
@@ -0,0 +1,841 @@
+/*************************************************************************
+ *
+ *  $RCSfile: cpp2uno.cxx,v $
+ *
+ *  $Revision: 1.2 $
+ *
+ *  last change: $Author: hr $ $Date: 2003-07-16 17:32:29 $
+ *
+ *  The Contents of this file are made available subject to the terms of
+ *  either of the following licenses
+ *
+ *         - GNU Lesser General Public License Version 2.1
+ *         - Sun Industry Standards Source License Version 1.1
+ *
+ *  Sun Microsystems Inc., October, 2000
+ *
+ *  GNU Lesser General Public License Version 2.1
+ *  =============================================
+ *  Copyright 2000 by Sun Microsystems, Inc.
+ *  901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License version 2.1, as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *  MA  02111-1307  USA
+ *
+ *
+ *  Sun Industry Standards Source License Version 1.1
+ *  =================================================
+ *  The contents of this file are subject to the Sun Industry Standards
+ *  Source License Version 1.1 (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.openoffice.org/license.html.
+ *
+ *  Software provided under this License is provided on an "AS IS" basis,
+ *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ *  See the License for the specific provisions governing your rights and
+ *  obligations concerning the Software.
+ *
+ *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ *  Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ *  All Rights Reserved.
+ *
+ *  Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+
+// #include <malloc.h>
+#include <hash_map>
+
+#include <rtl/alloc.h>
+#include <osl/mutex.hxx>
+
+#include <uno/data.h>
+#include <typelib/typedescription.hxx>
+
+#include <bridges/cpp_uno/bridge.hxx>
+#include <bridges/cpp_uno/type_misc.hxx>
+
+#include "share.hxx"
+
+
+using namespace ::osl;
+using namespace ::rtl;
+using namespace ::com::sun::star::uno;
+
+namespace CPPU_CURRENT_NAMESPACE
+{
+
+//==================================================================================================
+rtl_StandardModuleCount g_moduleCount = MODULE_COUNT_INIT;
+
+//==================================================================================================
+static typelib_TypeClass cpp2uno_call(
+    cppu_cppInterfaceProxy * pThis,
+    const typelib_TypeDescription * pMemberTypeDescr,
+    typelib_TypeDescriptionReference * pReturnTypeRef, // 0 indicates void return
+    sal_Int32 nParams, typelib_MethodParameter * pParams,
+        void ** gpreg, void ** fpreg, void ** ovrflw,
+    sal_Int64 * pRegisterReturn /* space for register return */ )
+{
+
+        // gpreg:  [ret *], this, [gpr params]
+        // fpreg:  [fpr params]
+        // ovrflw: [gpr or fpr params (space for entire parameter list in structure format properly aligned)]
+
+    // return
+    typelib_TypeDescription * pReturnTypeDescr = 0;
+    if (pReturnTypeRef)
+        TYPELIB_DANGER_GET( &pReturnTypeDescr, pReturnTypeRef );
+
+    void * pUnoReturn = 0;
+    void * pCppReturn = 0; // complex return ptr: if != 0 && != pUnoReturn, reconversion need
+
+    sal_Int32 ngpreg = 0;
+    sal_Int32 nfpreg = 0;
+
+
+    if (pReturnTypeDescr)
+    {
+        if (cppu_isSimpleType( pReturnTypeDescr ))
+            pUnoReturn = pRegisterReturn; // direct way for simple types
+        else // complex return via ptr (pCppReturn)
+        {
+            pCppReturn = *gpreg;
+            ngpreg++;
+            ++ovrflw;
+
+            pUnoReturn = (cppu_relatesToInterface( pReturnTypeDescr )
+                          ? alloca( pReturnTypeDescr->nSize )
+                          : pCppReturn); // direct way
+        }
+    }
+    // pop this
+    ngpreg++;
+    ++ovrflw;
+
+        // after handling optional return pointer and "this"
+        // make use of the space that is allocated to store all parameters in the callers stack
+        // by comying the proper registers filled with parameters to that space
+    char * pCppStack = (char *)ovrflw;
+
+
+    sal_Int32 nPos;
+
+    for ( nPos = 0; nPos < nParams; ++nPos )
+    {
+        const typelib_MethodParameter & rParam = pParams[nPos];
+        if (rParam.bOut)
+        {
+            if (ngpreg < 8)
+            {
+                *(sal_Int32 *)pCppStack = ((sal_Int32 *)gpreg)[ngpreg++];
+            }
+            pCppStack += sizeof (sal_Int32);
+        }
+        else
+        {
+        switch (rParam.pTypeRef->eTypeClass)
+        {
+        case typelib_TypeClass_FLOAT:
+            if (nfpreg < 13)
+            {
+                *(float *)pCppStack = ((double *)fpreg)[nfpreg++];
+            }
+            pCppStack += sizeof (float);
+            ngpreg += 1;
+            break;
+        case typelib_TypeClass_DOUBLE:
+            if (nfpreg < 13)
+            {
+                *(double *)pCppStack = ((double *)fpreg)[nfpreg++];
+            }
+            pCppStack += sizeof (double);
+            ngpreg += 2;
+            break;
+        case typelib_TypeClass_UNSIGNED_HYPER:
+        case typelib_TypeClass_HYPER:
+            if (ngpreg < 8)
+            {
+                *(sal_Int32 *)pCppStack = ((sal_Int32 *)gpreg)[ngpreg++];
+            }
+            pCppStack += sizeof (sal_Int32);
+                        // fall through on purpose
+        default:
+            if (ngpreg < 8)
+            {
+                *(sal_Int32 *)pCppStack = ((sal_Int32 *)gpreg)[ngpreg++];
+            }
+            pCppStack += sizeof (sal_Int32);
+        }
+        }
+    }
+
+        // now the stack has all of the paramters stored in it ready to be processed
+        // so we are ready to build the uno call stack
+    pCppStack = (char *)ovrflw;
+
+    // stack space
+    OSL_ENSURE( sizeof(void *) == sizeof(sal_Int32), "### unexpected size!" );
+
+    // parameters
+    void ** pUnoArgs = (void **)alloca( 4 * sizeof(void *) * nParams );
+    void ** pCppArgs = pUnoArgs + nParams;
+
+    // indizes of values this have to be converted (interface conversion cpp<=>uno)
+    sal_Int32 * pTempIndizes = (sal_Int32 *)(pUnoArgs + (2 * nParams));
+
+    // type descriptions for reconversions
+    typelib_TypeDescription ** ppTempParamTypeDescr = (typelib_TypeDescription **)(pUnoArgs + (3 * nParams));
+
+    sal_Int32 nTempIndizes   = 0;
+
+    for ( nPos = 0; nPos < nParams; ++nPos )
+    {
+        const typelib_MethodParameter & rParam = pParams[nPos];
+        typelib_TypeDescription * pParamTypeDescr = 0;
+        TYPELIB_DANGER_GET( &pParamTypeDescr, rParam.pTypeRef );
+
+        if (!rParam.bOut && cppu_isSimpleType( pParamTypeDescr )) // value
+        {
+            switch (pParamTypeDescr->eTypeClass)
+            {
+            case typelib_TypeClass_BOOLEAN:
+            case typelib_TypeClass_BYTE:
+                pCppArgs[nPos] = pCppStack +3;
+                pUnoArgs[nPos] = pCppStack +3;
+                break;
+            case typelib_TypeClass_CHAR:
+            case typelib_TypeClass_SHORT:
+            case typelib_TypeClass_UNSIGNED_SHORT:
+                pCppArgs[nPos] = pCppStack +2;
+                pUnoArgs[nPos] = pCppStack +2;
+                break;
+            case typelib_TypeClass_HYPER:
+            case typelib_TypeClass_UNSIGNED_HYPER:
+            case typelib_TypeClass_DOUBLE:
+                pCppArgs[nPos] = pCppStack;
+                pUnoArgs[nPos] = pCppStack;
+                pCppStack += sizeof(sal_Int32); // extra long (two regs)
+                break;
+            default:
+                pCppArgs[nPos] = pCppStack;
+                pUnoArgs[nPos] = pCppStack;
+            }
+            // no longer needed
+            TYPELIB_DANGER_RELEASE( pParamTypeDescr );
+        }
+        else // ptr to complex value | ref
+        {
+            pCppArgs[nPos] = *(void **)pCppStack;
+
+            if (! rParam.bIn) // is pure out
+            {
+                // uno out is unconstructed mem!
+                pUnoArgs[nPos] = alloca( pParamTypeDescr->nSize );
+                pTempIndizes[nTempIndizes] = nPos;
+                // will be released at reconversion
+                ppTempParamTypeDescr[nTempIndizes++] = pParamTypeDescr;
+            }
+            // is in/inout
+            else if (cppu_relatesToInterface( pParamTypeDescr ))
+            {
+                uno_copyAndConvertData( pUnoArgs[nPos] = alloca( pParamTypeDescr->nSize ),
+                                        *(void **)pCppStack, pParamTypeDescr,
+                                        &pThis->pBridge->aCpp2Uno );
+                pTempIndizes[nTempIndizes] = nPos; // has to be reconverted
+                // will be released at reconversion
+                ppTempParamTypeDescr[nTempIndizes++] = pParamTypeDescr;
+            }
+            else // direct way
+            {
+                pUnoArgs[nPos] = *(void **)pCppStack;
+                // no longer needed
+                TYPELIB_DANGER_RELEASE( pParamTypeDescr );
+            }
+        }
+        pCppStack += sizeof(sal_Int32); // standard parameter length
+    }
+
+
+    // ExceptionHolder
+    uno_Any aUnoExc; // Any will be constructed by callee
+    uno_Any * pUnoExc = &aUnoExc;
+
+    // invoke uno dispatch call
+    (*pThis->pUnoI->pDispatcher)( pThis->pUnoI, pMemberTypeDescr, pUnoReturn, pUnoArgs, &pUnoExc );
+
+    // in case an exception occured...
+    if (pUnoExc)
+    {
+        // destruct temporary in/inout params
+        for ( ; nTempIndizes--; )
+        {
+            sal_Int32 nIndex = pTempIndizes[nTempIndizes];
+
+            if (pParams[nIndex].bIn) // is in/inout => was constructed
+                uno_destructData( pUnoArgs[nIndex], ppTempParamTypeDescr[nTempIndizes], 0 );
+            TYPELIB_DANGER_RELEASE( ppTempParamTypeDescr[nTempIndizes] );
+        }
+        if (pReturnTypeDescr)
+            TYPELIB_DANGER_RELEASE( pReturnTypeDescr );
+
+        raiseException( &aUnoExc, &pThis->pBridge->aUno2Cpp ); // has to destruct the any
+        // is here for dummy
+        return typelib_TypeClass_VOID;
+    }
+    else // else no exception occured...
+    {
+        // temporary params
+        for ( ; nTempIndizes--; )
+        {
+            sal_Int32 nIndex = pTempIndizes[nTempIndizes];
+            typelib_TypeDescription * pParamTypeDescr = ppTempParamTypeDescr[nTempIndizes];
+
+            if (pParams[nIndex].bOut) // inout/out
+            {
+                // convert and assign
+                uno_destructData( pCppArgs[nIndex], pParamTypeDescr, cpp_release );
+                uno_copyAndConvertData( pCppArgs[nIndex], pUnoArgs[nIndex], pParamTypeDescr,
+                                        &pThis->pBridge->aUno2Cpp );
+            }
+            // destroy temp uno param
+            uno_destructData( pUnoArgs[nIndex], pParamTypeDescr, 0 );
+
+            TYPELIB_DANGER_RELEASE( pParamTypeDescr );
+        }
+        // return
+        if (pCppReturn) // has complex return
+        {
+            if (pUnoReturn != pCppReturn) // needs reconversion
+            {
+                uno_copyAndConvertData( pCppReturn, pUnoReturn, pReturnTypeDescr,
+                                        &pThis->pBridge->aUno2Cpp );
+                // destroy temp uno return
+                uno_destructData( pUnoReturn, pReturnTypeDescr, 0 );
+            }
+            // complex return ptr is set to return reg
+            *(void **)pRegisterReturn = pCppReturn;
+        }
+        if (pReturnTypeDescr)
+        {
+            typelib_TypeClass eRet = (typelib_TypeClass)pReturnTypeDescr->eTypeClass;
+            TYPELIB_DANGER_RELEASE( pReturnTypeDescr );
+            return eRet;
+        }
+        else
+            return typelib_TypeClass_VOID;
+    }
+}
+
+
+//==================================================================================================
+static typelib_TypeClass cpp_mediate(
+    sal_Int32 nVtableCall,
+        void ** gpreg, void ** fpreg, void ** ovrflw,
+    sal_Int64 * pRegisterReturn /* space for register return */ )
+{
+    OSL_ENSURE( sizeof(sal_Int32)==sizeof(void *), "### unexpected!" );
+
+    // gpreg:  [ret *], this, [other gpr params]
+    // fpreg:  [fpr params]
+    // ovrflw: [gpr or fpr params (in space allocated for all params properly aligned)]
+
+    // _this_ ptr is patched cppu_XInterfaceProxy object
+    cppu_cppInterfaceProxy * pCppI = NULL;
+    if( nVtableCall & 0x80000000 )
+    {
+        nVtableCall &= 0x7fffffff;
+        pCppI = (cppu_cppInterfaceProxy *)(XInterface *)*(gpreg +1);
+    }
+    else
+    {
+        pCppI = (cppu_cppInterfaceProxy *)(XInterface *)*(gpreg);
+    }
+
+    typelib_InterfaceTypeDescription * pTypeDescr = pCppI->pTypeDescr;
+
+    OSL_ENSURE( nVtableCall < pTypeDescr->nMapFunctionIndexToMemberIndex, "### illegal vtable index!" );
+    if (nVtableCall >= pTypeDescr->nMapFunctionIndexToMemberIndex)
+    {
+        throw RuntimeException(
+            OUString::createFromAscii("illegal vtable index!"),
+            (XInterface *)pCppI );
+    }
+
+    // determine called method
+    OSL_ENSURE( nVtableCall < pTypeDescr->nMapFunctionIndexToMemberIndex, "### illegal vtable index!" );
+    sal_Int32 nMemberPos = pTypeDescr->pMapFunctionIndexToMemberIndex[nVtableCall];
+    OSL_ENSURE( nMemberPos < pTypeDescr->nAllMembers, "### illegal member index!" );
+
+    TypeDescription aMemberDescr( pTypeDescr->ppAllMembers[nMemberPos] );
+
+    typelib_TypeClass eRet;
+    switch (aMemberDescr.get()->eTypeClass)
+    {
+    case typelib_TypeClass_INTERFACE_ATTRIBUTE:
+    {
+        if (pTypeDescr->pMapMemberIndexToFunctionIndex[nMemberPos] == nVtableCall)
+        {
+            // is GET method
+            eRet = cpp2uno_call(
+                pCppI, aMemberDescr.get(),
+                ((typelib_InterfaceAttributeTypeDescription *)aMemberDescr.get())->pAttributeTypeRef,
+                0, 0, // no params
+                gpreg, fpreg, ovrflw, pRegisterReturn );
+        }
+        else
+        {
+            // is SET method
+            typelib_MethodParameter aParam;
+            aParam.pTypeRef =
+                ((typelib_InterfaceAttributeTypeDescription *)aMemberDescr.get())->pAttributeTypeRef;
+            aParam.bIn      = sal_True;
+            aParam.bOut     = sal_False;
+
+            eRet = cpp2uno_call(
+                pCppI, aMemberDescr.get(),
+                0, // indicates void return
+                1, &aParam,
+                gpreg, fpreg, ovrflw, pRegisterReturn );
+        }
+        break;
+    }
+    case typelib_TypeClass_INTERFACE_METHOD:
+    {
+        // is METHOD
+        switch (nVtableCall)
+        {
+        case 1: // acquire()
+            pCppI->acquireProxy(); // non virtual call!
+            eRet = typelib_TypeClass_VOID;
+            break;
+        case 2: // release()
+            pCppI->releaseProxy(); // non virtual call!
+            eRet = typelib_TypeClass_VOID;
+            break;
+        case 0: // queryInterface() opt
+        {
+            typelib_TypeDescription * pTD = 0;
+            TYPELIB_DANGER_GET( &pTD, reinterpret_cast< Type * >( gpreg[2] )->getTypeLibType() );
+            if (pTD)
+            {
+                XInterface * pInterface = 0;
+                (*pCppI->pBridge->pCppEnv->getRegisteredInterface)(
+                    pCppI->pBridge->pCppEnv,
+                    (void **)&pInterface, pCppI->oid.pData, (typelib_InterfaceTypeDescription *)pTD );
+
+                if (pInterface)
+                {
+                    ::uno_any_construct(
+                        reinterpret_cast< uno_Any * >( gpreg[0] ),
+                        &pInterface, pTD, cpp_acquire );
+                    pInterface->release();
+                    TYPELIB_DANGER_RELEASE( pTD );
+                    *(void **)pRegisterReturn = gpreg[0];
+                    eRet = typelib_TypeClass_ANY;
+                    break;
+                }
+                TYPELIB_DANGER_RELEASE( pTD );
+            }
+        } // else perform queryInterface()
+        default:
+            eRet = cpp2uno_call(
+                pCppI, aMemberDescr.get(),
+                ((typelib_InterfaceMethodTypeDescription *)aMemberDescr.get())->pReturnTypeRef,
+                ((typelib_InterfaceMethodTypeDescription *)aMemberDescr.get())->nParams,
+                ((typelib_InterfaceMethodTypeDescription *)aMemberDescr.get())->pParams,
+                gpreg, fpreg, ovrflw, pRegisterReturn );
+        }
+        break;
+    }
+    default:
+    {
+        throw RuntimeException(
+            OUString::createFromAscii("no member description found!"),
+            (XInterface *)pCppI );
+        // is here for dummy
+        eRet = typelib_TypeClass_VOID;
+    }
+    }
+
+    return eRet;
+}
+
+//==================================================================================================
+/**
+ * is called on incoming vtable calls
+ * (called by asm snippets)
+ */
+static void cpp_vtable_call( int nTableEntry, void** gpregptr, void** fpregptr, void** ovrflw)
+{
+        sal_Int32     gpreg[8];
+        double        fpreg[13];
+
+        // FIXME: why are we restoring the volatile ctr register here
+    sal_Int32   ctrsave = ((sal_Int32*)gpregptr)[-1];
+
+        memcpy( gpreg, gpregptr, 32);
+        memcpy( fpreg, fpregptr, 104);
+
+    volatile long nRegReturn[2];
+
+        sal_Bool bComplex = nTableEntry & 0x80000000 ? sal_True : sal_False;
+
+    typelib_TypeClass aType =
+             cpp_mediate( nTableEntry, (void**)gpreg, (void**)fpreg, ovrflw, (sal_Int64*)nRegReturn );
+
+        // FIXME: why are we restoring the volatile ctr register here
+        // FIXME: and why are we putting back the values for r4, r5, and r6 as well
+        // FIXME: this makes no sense to me, all of these registers are volatile!
+    __asm__( "lwz r4, %0\n\t"
+        "mtctr r4\n\t"
+        "lwz r4, %1\n\t"
+        "lwz r5, %2\n\t"
+        "lwz r6, %3\n\t"
+         : : "m"(ctrsave), "m"(gpreg[1]), "m"(gpreg[2]), "m"(gpreg[3]) );
+
+    switch( aType )
+    {
+
+                // move return value into register space
+                // (will be loaded by machine code snippet)
+
+                case typelib_TypeClass_BOOLEAN:
+                case typelib_TypeClass_BYTE:
+                  __asm__( "lbz r3,%0\n\t" : :
+               "m"(nRegReturn[0]) );
+                  break;
+
+                case typelib_TypeClass_CHAR:
+                case typelib_TypeClass_SHORT:
+                case typelib_TypeClass_UNSIGNED_SHORT:
+                  __asm__( "lhz r3,%0\n\t" : :
+               "m"(nRegReturn[0]) );
+                  break;
+
+        case typelib_TypeClass_FLOAT:
+                  __asm__( "lfs f1,%0\n\t" : :
+                           "m" (*((float*)nRegReturn)) );
+          break;
+
+        case typelib_TypeClass_DOUBLE:
+          __asm__( "lfd f1,%0\n\t" : :
+                           "m" (*((double*)nRegReturn)) );
+          break;
+
+        case typelib_TypeClass_HYPER:
+        case typelib_TypeClass_UNSIGNED_HYPER:
+          __asm__( "lwz r4,%0\n\t" : :
+                           "m"(nRegReturn[1]) );  // fall through
+
+        default:
+          __asm__( "lwz r3,%0\n\t" : :
+                           "m"(nRegReturn[0]) );
+          break;
+    }
+}
+
+
+//__________________________________________________________________________________________________
+
+// FIXME: this is overkill, we should flush the data caches and invalidate
+// the instruction caches in loop and then do the sync, isync at the end
+
+void flush_icache(char *addr)
+{
+  __asm__ volatile (
+                "dcbf 0,%0;"
+                "sync;"
+                "icbi 0,%0;"
+                "sync;"
+                "isync;"
+                : : "r"(addr) : "memory");
+}
+
+
+void flush_range(char * addr1, int size)
+{
+#define MIN_LINE_SIZE 32
+  int i;
+  for (i = 0; i < size; i += MIN_LINE_SIZE)
+    flush_icache(addr1+i);
+  flush_icache(addr1+size-1);
+}
+
+
+//==================================================================================================
+class MediateClassData
+{
+    typedef ::std::hash_map< OUString, void *, OUStringHash > t_classdata_map;
+    t_classdata_map m_map;
+    Mutex m_mutex;
+
+public:
+    void const * get_vtable( typelib_InterfaceTypeDescription * pTD ) SAL_THROW( () );
+
+    inline MediateClassData() SAL_THROW( () )
+        {}
+    ~MediateClassData() SAL_THROW( () );
+};
+
+//__________________________________________________________________________________________________
+MediateClassData::~MediateClassData() SAL_THROW( () )
+{
+    OSL_TRACE( "> calling ~MediateClassData(): freeing mediate vtables." );
+
+    for ( t_classdata_map::const_iterator iPos( m_map.begin() ); iPos != m_map.end(); ++iPos )
+    {
+        ::rtl_freeMemory( iPos->second );
+    }
+}
+
+//--------------------------------------------------------------------------------------------------
+static inline void codeSnippet( long * code, sal_uInt32 vtable_pos, bool simple_ret_type ) SAL_THROW( () )
+{
+    if (! simple_ret_type)
+        vtable_pos |= 0x80000000;
+    OSL_ASSERT( sizeof (long) == 4 );
+
+    // FIXME: why are we leaving an 8k gap in the stack here
+    // FIXME: is this to allow room for signal handling frames?
+    // FIXME: seems like overkill here but this is what was done for Mac OSX for gcc2
+    // FIXME: also why no saving of the non-volatile CR pieces here, to be safe
+    // FIXME: we probably should
+
+    /* generate this code */
+
+    // # so first save gpr 3 to gpr 10 (aligned to 4)
+    //  stw   r3, -8000(r1)
+    //  stw   r4, -7996(r1)
+    //  stw   r5, -7992(r1)
+    //  stw   r6, -7988(r1)
+    //  stw   r7, -7984(r1)
+    //  stw   r8, -7980(r1)
+    //  stw   r9, -7976(r1)
+    //  stw   r10,-7972(r1)
+
+    // # next save fpr 1 to fpr 13 (aligned to 8)
+    //  stfd  f1, -7968(r1)
+    //  stfd  f2, -7960(r1)
+    //  stfd  f3, -7952(r1)
+    //  stfd  f4, -7944(r1)
+    //  stfd  f5, -7936(r1)
+    //  stfd  f6, -7928(r1)
+    //  stfd  f7, -7920(r1)
+    //  stfd  f8, -7912(r1)
+    //  stfd  f9, -7904(r1)
+    //  stfd  f10,-7896(r1)
+    //  stfd  f11,-7888(r1)
+    //  stfd  f12,-7880(r1)
+    //  stfd  f13,-7872(r1)
+
+    // FIXME: ctr is volatile, while are we saving it and not CR?
+    // mfctr r3
+    // stw r3, -8004(r1)
+
+    // # now here is where cpp_vtable_call must go
+    // lis r3,0xdead
+    // ori r3,r3,0xbeef
+    // mtctr r3
+
+    // # now load up the the table entry number
+    // lis r3, 0xdead
+    // ori r3,r3,0xbeef
+
+    // #now load up the pointer to the saved gpr registers
+    // addi r4,r1,-8000
+
+    // #now load up the pointer to the saved fpr registers
+    // addi r5,r1,-7968
+
+    // #now load up the pointer to the overflow call stack
+    // addi r6,r1,24 # frame pointer plus 24
+
+    // bctr
+
+
+    * code++ = 0x9061e0c0;
+    * code++ = 0x9081e0c4;
+    * code++ = 0x90a1e0c8;
+    * code++ = 0x90c1e0cc;
+    * code++ = 0x90e1e0d0;
+    * code++ = 0x9101e0d4;
+    * code++ = 0x9121e0d8;
+    * code++ = 0x9141e0dc;
+    * code++ = 0xd821e0e0;
+    * code++ = 0xd841e0e8;
+    * code++ = 0xd861e0f0;
+    * code++ = 0xd881e0f8;
+    * code++ = 0xd8a1e100;
+    * code++ = 0xd8c1e108;
+    * code++ = 0xd8e1e110;
+    * code++ = 0xd901e118;
+    * code++ = 0xd921e120;
+    * code++ = 0xd941e128;
+    * code++ = 0xd961e130;
+    * code++ = 0xd981e138;
+    * code++ = 0xd9a1e140;
+    * code++ = 0x7c6902a6;
+    * code++ = 0x9061e0bc;
+    * code++ = 0x3c600000 | (((unsigned long)cpp_vtable_call) >> 16);
+    * code++ = 0x60630000 | (((unsigned long)cpp_vtable_call) & 0x0000FFFF);
+    * code++ = 0x7c6903a6;
+    * code++ = 0x3c600000 | (vtable_pos >> 16);
+    * code++ = 0x60630000 | (vtable_pos & 0x0000FFFF);
+    * code++ = 0x3881e0c0;
+    * code++ = 0x38a1e0e0;
+    * code++ = 0x38c10018;
+    * code++ = 0x4e800420;
+
+
+      // don't forget to flush the data and caches after calling this routine
+      // otherwise the self-modifying code we wrote above will not be processed properly
+      // and we need to remove stale instruction cache
+
+      // note the size of this snippet of code needs to be kept consistent with
+      // nSnippetSize below (it is now 32 instructions 4 bytes long each = 128 bytes)
+
+}
+
+
+//__________________________________________________________________________________________________
+void const * MediateClassData::get_vtable( typelib_InterfaceTypeDescription * pTD ) SAL_THROW( () )
+{
+    void * buffer;
+    const int nSnippetSize = 128;
+
+    // avoiding locked counts
+    OUString const & unoName = *(OUString const *)&((typelib_TypeDescription *)pTD)->pTypeName;
+    {
+    MutexGuard aGuard( m_mutex );
+    t_classdata_map::const_iterator iFind( m_map.find( unoName ) );
+    if (iFind == m_map.end())
+    {
+        // create new vtable
+        sal_Int32 nSlots = pTD->nMapFunctionIndexToMemberIndex;
+        buffer = ::rtl_allocateMemory( ((2+ nSlots) * sizeof (void *)) + (nSlots *nSnippetSize) );
+
+        ::std::pair< t_classdata_map::iterator, bool > insertion(
+            m_map.insert( t_classdata_map::value_type( unoName, buffer ) ) );
+        OSL_ENSURE( insertion.second, "### inserting new vtable buffer failed?!" );
+
+        void ** slots = (void **)buffer;
+        *slots++ = 0;
+        *slots++ = 0; // rtti
+        char * code = (char *)(slots + nSlots);
+
+        sal_uInt32 vtable_pos = 0;
+        sal_Int32 nAllMembers = pTD->nAllMembers;
+        typelib_TypeDescriptionReference ** ppAllMembers = pTD->ppAllMembers;
+        for ( sal_Int32 nPos = 0; nPos < nAllMembers; ++nPos )
+        {
+            typelib_TypeDescription * pTD = 0;
+            TYPELIB_DANGER_GET( &pTD, ppAllMembers[ nPos ] );
+            OSL_ASSERT( pTD );
+            if (typelib_TypeClass_INTERFACE_ATTRIBUTE == pTD->eTypeClass)
+            {
+                bool simple_ret = cppu_isSimpleType(
+                    ((typelib_InterfaceAttributeTypeDescription *)pTD)->pAttributeTypeRef->eTypeClass );
+                // get method
+                *slots = code;
+                codeSnippet( (long *)code, vtable_pos++, simple_ret );
+                flush_range( code, nSnippetSize );
+                code += nSnippetSize;
+                slots++;
+                if (! ((typelib_InterfaceAttributeTypeDescription *)pTD)->bReadOnly)
+                {
+                    // set method
+                    *slots = code;
+                    codeSnippet( (long *)code, vtable_pos++, true );
+                    flush_range( code, nSnippetSize );
+                    code += nSnippetSize;
+                    slots++;
+                }
+            }
+            else
+            {
+                bool simple_ret = cppu_isSimpleType(
+                    ((typelib_InterfaceMethodTypeDescription *)pTD)->pReturnTypeRef->eTypeClass );
+                *slots = code;
+                codeSnippet( (long *)code, vtable_pos++, simple_ret );
+                flush_range( code, nSnippetSize );
+                code += nSnippetSize;
+                slots++;
+            }
+            TYPELIB_DANGER_RELEASE( pTD );
+        }
+        OSL_ASSERT( vtable_pos == nSlots );
+    }
+    else
+    {
+        buffer = iFind->second;
+    }
+    }
+
+    return ((void **)buffer +2);
+}
+
+//==================================================================================================
+void SAL_CALL cppu_cppInterfaceProxy_patchVtable(
+    XInterface * pCppI, typelib_InterfaceTypeDescription * pTypeDescr ) throw ()
+{
+    static MediateClassData * s_pMediateClassData = 0;
+    if (! s_pMediateClassData)
+    {
+        MutexGuard aGuard( Mutex::getGlobalMutex() );
+        if (! s_pMediateClassData)
+        {
+#ifdef LEAK_STATIC_DATA
+            s_pMediateClassData = new MediateClassData();
+#else
+            static MediateClassData s_aMediateClassData;
+            s_pMediateClassData = &s_aMediateClassData;
+#endif
+        }
+    }
+    *(void const **)pCppI = s_pMediateClassData->get_vtable( pTypeDescr );
+}
+
+}
+
+extern "C"
+{
+//##################################################################################################
+sal_Bool SAL_CALL component_canUnload( TimeValue * pTime )
+    SAL_THROW_EXTERN_C()
+{
+    return CPPU_CURRENT_NAMESPACE::g_moduleCount.canUnload(
+        &CPPU_CURRENT_NAMESPACE::g_moduleCount, pTime );
+}
+//##################################################################################################
+void SAL_CALL uno_initEnvironment( uno_Environment * pCppEnv )
+    SAL_THROW_EXTERN_C()
+{
+    CPPU_CURRENT_NAMESPACE::cppu_cppenv_initEnvironment(
+        pCppEnv );
+}
+//##################################################################################################
+void SAL_CALL uno_ext_getMapping(
+    uno_Mapping ** ppMapping, uno_Environment * pFrom, uno_Environment * pTo )
+    SAL_THROW_EXTERN_C()
+{
+    CPPU_CURRENT_NAMESPACE::cppu_ext_getMapping(
+        ppMapping, pFrom, pTo );
+}
+}