/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



#include <malloc.h>
#include <rtl/alloc.h>

#include <com/sun/star/uno/genfunc.hxx>
#include "com/sun/star/uno/RuntimeException.hpp"
#include <uno/data.h>

#include <bridges/cpp_uno/shared/bridge.hxx>
#include <bridges/cpp_uno/shared/types.hxx>
#include <bridges/cpp_uno/shared/unointerfaceproxy.hxx>
#include <bridges/cpp_uno/shared/vtables.hxx>

#include "share.hxx"

#include <stdio.h>
#include <string.h>

using namespace ::rtl;
using namespace ::com::sun::star::uno;

void MapReturn(sal_uInt32 ret0, sal_uInt32 ret1, typelib_TypeDescription *pReturnTypeDescr, bool bRegisterReturn, sal_uInt32 *pRegisterReturn)
{
    register float fret asm("fr4");
    register double dret asm("fr4");

    switch (pReturnTypeDescr->eTypeClass)
    {
        case typelib_TypeClass_HYPER:
        case typelib_TypeClass_UNSIGNED_HYPER:
            pRegisterReturn[1] = ret1;
        case typelib_TypeClass_LONG:
        case typelib_TypeClass_UNSIGNED_LONG:
        case typelib_TypeClass_ENUM:
        case typelib_TypeClass_CHAR:
        case typelib_TypeClass_SHORT:
        case typelib_TypeClass_UNSIGNED_SHORT:
        case typelib_TypeClass_BOOLEAN:
        case typelib_TypeClass_BYTE:
            pRegisterReturn[0] = ret0;
            break;
        case typelib_TypeClass_FLOAT:
            *(float*)pRegisterReturn = fret;
	    break;
        case typelib_TypeClass_DOUBLE:
            *(double*)pRegisterReturn = dret;
            break;
        case typelib_TypeClass_STRUCT:
        case typelib_TypeClass_EXCEPTION:
        {
            if (bRegisterReturn)
            {
                pRegisterReturn[0] = ret0;
                pRegisterReturn[1] = ret1;
            }
            break;
        }
        default:
            break;
    }
}

//Moved callVirtual into this .cxx so that I can do this and get gcc to not
//touch r28 without having to learn any more pa-risc assembly than is
//strictly necessary
register sal_uInt32 r28 __asm__("%r28");

void callVirtualMethod(void * pThis, sal_uInt32 nVtableIndex, 
    void * pRegisterReturn, typelib_TypeDescription *pReturnTypeDescr, bool bRegisterReturn,
    sal_uInt32 *pStack, sal_uInt32 nStack, sal_uInt32 *pGPR, double *pFPR) __attribute__((noinline));

void callVirtualMethod(void * pThis, sal_uInt32 nVtableIndex, 
    void * pRegisterReturn, typelib_TypeDescription *pReturnTypeDescr, bool bRegisterReturn,
    sal_uInt32 *pStack, sal_uInt32 nStack, sal_uInt32 *pGPR, double *pFPR)
{
    register sal_uInt32* sp __asm__("%r30");

    sal_uInt32 pMethod = *((sal_uInt32*)pThis);
    pMethod += 4 * nVtableIndex;
    pMethod = *((sal_uInt32 *)pMethod);

#ifdef CMC_DEBUG
    fprintf(stderr, "this is %p\n", pGPR[0]);
    for (int i = 0; i < hppa::MAX_GPR_REGS ; ++i)
        fprintf(stderr, "normal reg %d is %d %x\n", i, pGPR[i], pGPR[i]);

    for (int i = 0; i < hppa::MAX_SSE_REGS ; ++i)
        fprintf(stderr, "float reg %d is %x\n", i, pFPR[i]);

    for (int i = 0; i < nStack; ++i)
        fprintf(stderr, "stack bytes are %x\n", pStack[i]);
#endif

    //Always reserve 4 slots, and align to 8 bytes
    sal_uInt32 nStackBytes = ( ( nStack + 4 + 1 ) >> 1 ) * 8;
    __builtin_alloca(nStackBytes);
    sal_uInt32 *stack = sp-8;
    int o = -5;
    for (sal_uInt32 i = 0; i < nStack; ++i, --o)
        stack[o] = pStack[i];

    typedef int (* FunctionCall )( sal_uInt32, sal_uInt32, sal_uInt32, sal_uInt32 );
    FunctionCall pFunc = (FunctionCall)pMethod;

    asm volatile("fldd %0, %%fr4" : : "m"(pFPR[0]) : "fr4");
    asm volatile("fldd %0, %%fr5" : : "m"(pFPR[1]) : "fr5");
    asm volatile("fldd %0, %%fr6" : : "m"(pFPR[2]) : "fr6");
    asm volatile("fldd %0, %%fr7" : : "m"(pFPR[3]) : "fr7");
    asm volatile("ldw %0, %%r28" : : "m"(pRegisterReturn) : "r28");
    (*pFunc)(pGPR[0], pGPR[1], pGPR[2], pGPR[3]);

    register sal_uInt32 r29 __asm__("%r29");
    MapReturn(r28, r29, pReturnTypeDescr, bRegisterReturn, (sal_uInt32*)pRegisterReturn);
}

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