/**************************************************************
 * 
 * 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 <com/sun/star/uno/genfunc.hxx>
#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"

//#define BRDEBUG
#ifdef BRDEBUG
#include <stdio.h>
#endif


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

namespace
{


  //==================================================================================================
  static void callVirtualMethod(
	  void * pAdjustedThisPtr,
	  sal_Int32 nVtableIndex,
	  void * pRegisterReturn,
	  typelib_TypeClass eReturnType,
	  char * pPT,
	  sal_Int32 * pStackLongs,
	  sal_Int32 /*nStackLongs*/)
  {

	// parameter list is mixed list of * and values
	// reference parameters are pointers

	unsigned long * mfunc;        // actual function to be invoked
	void (*ptr)();
	int gpr[4];                   // storage for gpregisters, map to a0-a3
	int off;                      // offset used to find function
	int nw;                       // number of words mapped
	long *p;                      // pointer to parameter overflow area
	int c;                        // character of parameter type being decoded
	int iret, iret2;              // temporary function return values

	// never called
	if (! pAdjustedThisPtr ) CPPU_CURRENT_NAMESPACE::dummy_can_throw_anything("xxx"); // address something

#ifdef BRDEBUG
	fprintf(stderr,"in CallVirtualMethod\n");
#endif

	// Because of the MIPS O32 calling conventions we could be passing
	// parameters in both register types and on the stack. To create the
	// stack parameter area we need we now simply allocate local
	// variable storage param[] that is at least the size of the parameter stack
	// (more than enough space) which we can overwrite the parameters into.

	/* p = sp - 512; new sp will be p - 16, but we don't change sp
	 * at this time to avoid breaking ABI--not sure whether changing sp will break
	 * references to local variables. For the same reason, we use abosulte value. 
	 */
	__asm__ __volatile__ (
		"addiu $2,$29,-512\n\t"
		"move %0,$2\n\t"
		:"=r"(p): : "$2","$29" );

#ifdef BRDEBUG
	 if (nStackLongs * 4 > 512 ) 
		 fprintf(stderr,"too many arguments"); 
#endif
	
	// now begin to load the C++ function arguments into storage
	nw = 0;

	// now we need to parse the entire signature string */
	// until we get the END indicator */

	// treat complex return pointer like any other parameter //

#ifdef BRDEBUG
	fprintf(stderr,"overflow area pointer p=%p\n",p);

	/* Let's figure out what is really going on here*/
	fprintf(stderr,"callVirtualMethod paramters string is %s\n",pPT);
	int k = nStackLongs;
	long * q = (long *)pStackLongs;
	while (k > 0) {
	  fprintf(stderr,"uno stack is: %x\n",(unsigned int)*q);
	  k--;
	  q++;
	}
#endif

	/* parse the argument list up to the ending ) */
	while (*pPT != 'X') {
	  c = *pPT;
	  switch (c) {
		case 'D':                   /* type is double */
		  /* treat the same as long long */
		case 'H':                /* type is long long */
		  if (nw & 1) nw++; 	/* note even elements gpr[] will map to
							   odd registers*/
		  if (nw < 4) {
			gpr[nw++] = *pStackLongs;
			gpr[nw++] = *(pStackLongs+1);
		  } else {
			if (((long) p) & 4)          
			  p++;
			*p++ = *pStackLongs;
			*p++ = *(pStackLongs+1);
		  }
		  pStackLongs += 2;
		  break;

		case 'S':
		  if (nw < 4) {
			gpr[nw++] = *((unsigned short*)pStackLongs);
		  } else {
			*p++ = *((unsigned short *)pStackLongs);
		  }
		  pStackLongs += 1;
		  break;

		case 'B':
		  if (nw < 4) {
			gpr[nw++] = *((char *)pStackLongs);
		  } else {
			*p++ = *((char *)pStackLongs);
		  }
		  pStackLongs += 1;
		  break;

		default:
		  if (nw < 4) {
			gpr[nw++] = *pStackLongs;
		  } else {
			*p++ = *pStackLongs;
		  }
		  pStackLongs += 1;
		  break;
	  }
	  pPT++;
	}

	/* figure out the address of the function we need to invoke */
	off = nVtableIndex; 
	off = off * 4;                         // 4 bytes per slot
	mfunc = *((unsigned long **)pAdjustedThisPtr);    // get the address of the vtable
	mfunc = (unsigned long *)((char *)mfunc + off); // get the address from the vtable entry at offset 
	mfunc = *((unsigned long **)mfunc);                 // the function is stored at the address
	ptr = (void (*)())mfunc;   

#ifdef BRDEBUG
	fprintf(stderr,"calling function %p\n",mfunc);
#endif

	/* Set up the machine registers and invoke the function */

	__asm__ __volatile__ (
		"lw	$4,	0(%0)\n\t"
		"lw	$5,	4(%0)\n\t"
		"lw	$6,	8(%0)\n\t"
		"lw	$7,	12(%0)\n\t"
		: : "r" (gpr)
		: "$4", "$5", "$6", "$7"
		);

	__asm__ __volatile__ ("addiu $29,$29,-528\r\n":::"$29");

	(*ptr)();

	__asm__ __volatile__ ("addiu $29,$29,528\r\n":::"$29");

	__asm__ __volatile__ (
		"sw $2,%0 \n\t"
		"sw $3,%1 \n\t"
		: "=m" (iret), "=m" (iret2) : );
	register float fret asm("$f0");
	register double	dret asm("$f0");

	switch( eReturnType )
	{
	  case typelib_TypeClass_HYPER:
	  case typelib_TypeClass_UNSIGNED_HYPER:
	  	((long*)pRegisterReturn)[1] = iret2;	// fall through
	  case typelib_TypeClass_LONG:
	  case typelib_TypeClass_UNSIGNED_LONG:
	  case typelib_TypeClass_ENUM:
		((long*)pRegisterReturn)[0] = iret;
		break;
	  case typelib_TypeClass_CHAR:
	  case typelib_TypeClass_SHORT:
	  case typelib_TypeClass_UNSIGNED_SHORT:
		*(unsigned short*)pRegisterReturn = (unsigned short)iret;
		break;
	  case typelib_TypeClass_BOOLEAN:
	  case typelib_TypeClass_BYTE:
		*(unsigned char*)pRegisterReturn = (unsigned char)iret;
		break;
	  case typelib_TypeClass_FLOAT:
		*(float*)pRegisterReturn = fret;
		break;
	  case typelib_TypeClass_DOUBLE:
		*(double*)pRegisterReturn = dret;
		break;
	  default:
		break;
	}
  }


  //================================================================================================== 
  static void cpp_call(
	  bridges::cpp_uno::shared::UnoInterfaceProxy * pThis,
	  bridges::cpp_uno::shared::VtableSlot  aVtableSlot,
	  typelib_TypeDescriptionReference * pReturnTypeRef,
	  sal_Int32 nParams, typelib_MethodParameter * pParams,
	  void * pUnoReturn, void * pUnoArgs[], uno_Any ** ppUnoExc )
  {
	// max space for: [complex ret ptr], values|ptr ...
	char * pCppStack		=
	  (char *)alloca( sizeof(sal_Int32) + ((nParams+2) * sizeof(sal_Int64)) );
	char * pCppStackStart	= pCppStack;

	// need to know parameter types for callVirtualMethod so generate a signature string
	char * pParamType = (char *) alloca(nParams+2);
	char * pPT = pParamType;

#ifdef BRDEBUG
  fprintf(stderr,"in cpp_call\n");
#endif

	// return
	typelib_TypeDescription * pReturnTypeDescr = 0;
	TYPELIB_DANGER_GET( &pReturnTypeDescr, pReturnTypeRef );
	// OSL_ENSURE( pReturnTypeDescr, "### expected return type description!" );

	void * pCppReturn = 0; // if != 0 && != pUnoReturn, needs reconversion

	if (pReturnTypeDescr)
	{
	  if (bridges::cpp_uno::shared::isSimpleType( pReturnTypeDescr ))
	  {
		pCppReturn = pUnoReturn; // direct way for simple types
	  }
	  else
	  {
		// complex return via ptr
		pCppReturn = *(void **)pCppStack = 
		  (bridges::cpp_uno::shared::relatesToInterfaceType( pReturnTypeDescr )
		   ? alloca( pReturnTypeDescr->nSize ): pUnoReturn); // direct way
		*pPT++ = 'I'; //signify that a complex return type on stack
		pCppStack += sizeof(void *);
	  }
	}
	// push this
	void* pAdjustedThisPtr = reinterpret_cast< void **>(pThis->getCppI()) + aVtableSlot.offset;
	*(void**)pCppStack = pAdjustedThisPtr;
	pCppStack += sizeof( void* );
	*pPT++ = 'I';

	// stack space
	// OSL_ENSURE( sizeof(void *) == sizeof(sal_Int32), "### unexpected size!" );
	// args
	void ** pCppArgs  = (void **)alloca( 3 * sizeof(void *) * nParams );
	// indizes of values this have to be converted (interface conversion cpp<=>uno)
	sal_Int32 * pTempIndizes = (sal_Int32 *)(pCppArgs + nParams);
	// type descriptions for reconversions
	typelib_TypeDescription ** ppTempParamTypeDescr = (typelib_TypeDescription **)(pCppArgs + (2 * nParams));

	sal_Int32 nTempIndizes   = 0;

	for ( sal_Int32 nPos = 0; nPos < nParams; ++nPos )
	{
	  const typelib_MethodParameter & rParam = pParams[nPos];
	  typelib_TypeDescription * pParamTypeDescr = 0;
	  TYPELIB_DANGER_GET( &pParamTypeDescr, rParam.pTypeRef );

	  if (!rParam.bOut && bridges::cpp_uno::shared::isSimpleType( pParamTypeDescr ))
	  {
		uno_copyAndConvertData( pCppArgs[nPos] = pCppStack, pUnoArgs[nPos], pParamTypeDescr,
			pThis->getBridge()->getUno2Cpp() );

		switch (pParamTypeDescr->eTypeClass)
		{

		  // we need to know type of each param so that we know whether to use
		  // gpr or fpr to pass in parameters:
		  // Key: I - int, long, pointer, etc means pass in gpr
		  //      B - byte value passed in gpr
		  //      S - short value passed in gpr
		  //      F - float value pass in fpr
		  //      D - double value pass in fpr
		  //      H - long long int pass in proper pairs of gpr (3,4) (5,6), etc
		  //      X - indicates end of parameter description string

		  case typelib_TypeClass_LONG:
		  case typelib_TypeClass_UNSIGNED_LONG:
		  case typelib_TypeClass_ENUM:
			*pPT++ = 'I';
			break;
		  case typelib_TypeClass_SHORT:
		  case typelib_TypeClass_CHAR:
		  case typelib_TypeClass_UNSIGNED_SHORT:
			*pPT++ = 'S';
			break;
		  case typelib_TypeClass_BOOLEAN:
		  case typelib_TypeClass_BYTE:
			*pPT++ = 'B';
			break;
		  case typelib_TypeClass_FLOAT:
			*pPT++ = 'F';
			break;
		  case typelib_TypeClass_DOUBLE:
			*pPT++ = 'D';
			pCppStack += sizeof(sal_Int32); // extra long
			break;
		  case typelib_TypeClass_HYPER:
		  case typelib_TypeClass_UNSIGNED_HYPER:
			*pPT++ = 'H';
			pCppStack += sizeof(sal_Int32); // extra long
			break;
		  default:
			break;
		}

		// no longer needed
		TYPELIB_DANGER_RELEASE( pParamTypeDescr );
	  }
	  else // ptr to complex value | ref
	  {
		if (! rParam.bIn) // is pure out
		{
		  // cpp out is constructed mem, uno out is not!
		  uno_constructData(
			  *(void **)pCppStack = pCppArgs[nPos] = alloca( pParamTypeDescr->nSize ),
			  pParamTypeDescr );
		  pTempIndizes[nTempIndizes] = nPos; // default constructed for cpp call
		  // will be released at reconversion
		  ppTempParamTypeDescr[nTempIndizes++] = pParamTypeDescr;
		}
		// is in/inout
		else if (bridges::cpp_uno::shared::relatesToInterfaceType( pParamTypeDescr ))
		{
		  uno_copyAndConvertData(
			  *(void **)pCppStack = pCppArgs[nPos] = alloca( pParamTypeDescr->nSize ),
			  pUnoArgs[nPos], pParamTypeDescr, 
			  pThis->getBridge()->getUno2Cpp() );

		  pTempIndizes[nTempIndizes] = nPos; // has to be reconverted
		  // will be released at reconversion
		  ppTempParamTypeDescr[nTempIndizes++] = pParamTypeDescr;
		}
		else // direct way
		{
		  *(void **)pCppStack = pCppArgs[nPos] = pUnoArgs[nPos];
		  // no longer needed
		  TYPELIB_DANGER_RELEASE( pParamTypeDescr );
		}
		// KBH: FIXME: is this the right way to pass these
		*pPT++='I';
	  }
	  pCppStack += sizeof(sal_Int32); // standard parameter length
	}

	// terminate the signature string
	*pPT++='X';
	*pPT=0;

	try
	{
	  OSL_ENSURE( !( (pCppStack - pCppStackStart ) & 3), "UNALIGNED STACK !!! (Please DO panic)" );
	  callVirtualMethod(
		  pAdjustedThisPtr, aVtableSlot.index,
		  pCppReturn, pReturnTypeDescr->eTypeClass, pParamType,
		  (sal_Int32 *)pCppStackStart, (pCppStack - pCppStackStart) / sizeof(sal_Int32) );
	  // NO exception occured...
	  *ppUnoExc = 0;

	  // reconvert temporary params
	  for ( ; nTempIndizes--; )
	  {
		sal_Int32 nIndex = pTempIndizes[nTempIndizes];
		typelib_TypeDescription * pParamTypeDescr = ppTempParamTypeDescr[nTempIndizes];

		if (pParams[nIndex].bIn)
		{
		  if (pParams[nIndex].bOut) // inout
		  {
			uno_destructData( pUnoArgs[nIndex], pParamTypeDescr, 0 ); // destroy uno value
			uno_copyAndConvertData( pUnoArgs[nIndex], pCppArgs[nIndex], pParamTypeDescr,
				pThis->getBridge()->getCpp2Uno() );
		  }
		}
		else // pure out
		{
		  uno_copyAndConvertData( pUnoArgs[nIndex], pCppArgs[nIndex], pParamTypeDescr,
			  pThis->getBridge()->getCpp2Uno() );
		}
		// destroy temp cpp param => cpp: every param was constructed
		uno_destructData( pCppArgs[nIndex], pParamTypeDescr, cpp_release );

		TYPELIB_DANGER_RELEASE( pParamTypeDescr );
	  }
	  // return value
	  if (pCppReturn && pUnoReturn != pCppReturn)
	  {
		uno_copyAndConvertData( pUnoReturn, pCppReturn, pReturnTypeDescr,
			pThis->getBridge()->getCpp2Uno() );
		uno_destructData( pCppReturn, pReturnTypeDescr, cpp_release );
	  }
	}
	catch (...)
	{
	  // fill uno exception
	  fillUnoException( CPPU_CURRENT_NAMESPACE::__cxa_get_globals()->caughtExceptions, 
		  *ppUnoExc, pThis->getBridge()->getCpp2Uno() );

	  // temporary params
	  for ( ; nTempIndizes--; )
	  {
		sal_Int32 nIndex = pTempIndizes[nTempIndizes];
		// destroy temp cpp param => cpp: every param was constructed
		uno_destructData( pCppArgs[nIndex], ppTempParamTypeDescr[nTempIndizes], cpp_release );
		TYPELIB_DANGER_RELEASE( ppTempParamTypeDescr[nTempIndizes] );
	  }
	  // return type
	  if (pReturnTypeDescr)
		TYPELIB_DANGER_RELEASE( pReturnTypeDescr );
	}
  }

}


namespace bridges { namespace cpp_uno { namespace shared {

//==================================================================================================
void unoInterfaceProxyDispatch(
	uno_Interface * pUnoI, const typelib_TypeDescription * pMemberDescr,
    void * pReturn, void * pArgs[], uno_Any ** ppException )
{
  // is my surrogate
  bridges::cpp_uno::shared::UnoInterfaceProxy * pThis
	= static_cast< bridges::cpp_uno::shared::UnoInterfaceProxy *> (pUnoI);
  //typelib_InterfaceTypeDescription * pTypeDescr = pThis->pTypeDescr;

#ifdef BRDEBUG
  fprintf(stderr,"in dispatch\n");
#endif

  switch (pMemberDescr->eTypeClass)
  {
	case typelib_TypeClass_INTERFACE_ATTRIBUTE:
	  {

		VtableSlot aVtableSlot(
			getVtableSlot(
			  reinterpret_cast<
			  typelib_InterfaceAttributeTypeDescription const * >(
				pMemberDescr)));

		if (pReturn)
		{
		  // dependent dispatch
		  cpp_call(
			  pThis, aVtableSlot,
			  ((typelib_InterfaceAttributeTypeDescription *)pMemberDescr)->pAttributeTypeRef,
			  0, 0, // no params
			  pReturn, pArgs, ppException );
		}
		else
		{
		  // is SET
		  typelib_MethodParameter aParam;
		  aParam.pTypeRef =
			((typelib_InterfaceAttributeTypeDescription *)pMemberDescr)->pAttributeTypeRef;
		  aParam.bIn		= sal_True;
		  aParam.bOut		= sal_False;

		  typelib_TypeDescriptionReference * pReturnTypeRef = 0;
		  OUString aVoidName( RTL_CONSTASCII_USTRINGPARAM("void") );
		  typelib_typedescriptionreference_new(
			  &pReturnTypeRef, typelib_TypeClass_VOID, aVoidName.pData );

		  // dependent dispatch
		  aVtableSlot.index += 1; //get then set method
		  cpp_call(
			  pThis, aVtableSlot,
			  pReturnTypeRef,
			  1, &aParam,
			  pReturn, pArgs, ppException );

		  typelib_typedescriptionreference_release( pReturnTypeRef );
		}

		break;
	  }
	case typelib_TypeClass_INTERFACE_METHOD:
	  {

		VtableSlot aVtableSlot(
			getVtableSlot(
			  reinterpret_cast<
			  typelib_InterfaceMethodTypeDescription const * >(
				pMemberDescr)));
		switch (aVtableSlot.index)
		{
		  // standard calls
		  case 1: // acquire uno interface
			(*pUnoI->acquire)( pUnoI );
			*ppException = 0;
			break;
		  case 2: // release uno interface
			(*pUnoI->release)( pUnoI );
			*ppException = 0;
			break;
		  case 0: // queryInterface() opt
			{
			  typelib_TypeDescription * pTD = 0;
			  TYPELIB_DANGER_GET( &pTD, reinterpret_cast< Type * >( pArgs[0] )->getTypeLibType() );
			  if (pTD)
			  {
				uno_Interface * pInterface = 0;
				(*pThis->pBridge->getUnoEnv()->getRegisteredInterface)(
																	   pThis->pBridge->getUnoEnv(),
																	   (void **)&pInterface, pThis->oid.pData, (typelib_InterfaceTypeDescription *)pTD );

				if (pInterface)
				{
				  ::uno_any_construct(
					  reinterpret_cast< uno_Any * >( pReturn ),
					  &pInterface, pTD, 0 );
				  (*pInterface->release)( pInterface );
				  TYPELIB_DANGER_RELEASE( pTD );
				  *ppException = 0;
				  break;
				}
				TYPELIB_DANGER_RELEASE( pTD );
			  }
			} // else perform queryInterface()
		  default:
			// dependent dispatch
			cpp_call(
				pThis, aVtableSlot,
				((typelib_InterfaceMethodTypeDescription *)pMemberDescr)->pReturnTypeRef,
				((typelib_InterfaceMethodTypeDescription *)pMemberDescr)->nParams,
				((typelib_InterfaceMethodTypeDescription *)pMemberDescr)->pParams,
				pReturn, pArgs, ppException );
		}
		break;
	  }
	default:
	  {
		::com::sun::star::uno::RuntimeException aExc(
			OUString( RTL_CONSTASCII_USTRINGPARAM("illegal member type description!") ),
			::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface >() );

		Type const & rExcType = ::getCppuType( &aExc );
		// binary identical null reference
		::uno_type_any_construct( *ppException, &aExc, rExcType.getTypeLibType(), 0 );
	  }
  }
}
}}}