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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
#include "sal/config.h"
#include "cppu/macros.hxx"
#include "osl/diagnose.h"
#include "sal/types.h"
#include "typelib/typeclass.h"
#include "typelib/typedescription.h"
#include "callvirtualmethod.hxx"
#include "share.hxx"
#include "smallstruct.hxx"
// For some reason, callVirtualMethod needs to be in a source file of its own,
// so that stack unwinding upon a thrown exception from within the asm block
// call works, at least with GCC 4.7.0 and --enable-dbgutil.
// The call instruction within the asm section of callVirtualMethod may throw
// exceptions. So that the compiler handles this correctly, it is important
// that (a) callVirtualMethod might call dummy_can_throw_anything (although this
// never happens at runtime), which in turn can throw exceptions, and (b)
// callVirtualMethod is not inlined at its call site (so that any exceptions are
// caught which are thrown from the instruction calling callVirtualMethod). [It
// is unclear how much of this comment is still relevent -- see the above
// comment.]
void CPPU_CURRENT_NAMESPACE::callVirtualMethod(
void * pAdjustedThisPtr, sal_Int32 nVtableIndex, void * pRegisterReturn,
typelib_TypeDescription const * returnType, sal_Int32 * pStackLongs,
sal_Int32 nStackLongs)
{
// parameter list is mixed list of * and values
// reference parameters are pointers
OSL_ENSURE( pStackLongs && pAdjustedThisPtr, "### null ptr!" );
OSL_ENSURE( (sizeof(void *) == 4) && (sizeof(sal_Int32) == 4), "### unexpected size of int!" );
OSL_ENSURE( nStackLongs && pStackLongs, "### no stack in callVirtualMethod !" );
// never called
if (! pAdjustedThisPtr) CPPU_CURRENT_NAMESPACE::dummy_can_throw_anything("xxx"); // address something
volatile long edx = 0, eax = 0; // for register returns
void * stackptr;
asm volatile (
"mov %%esp, %6\n\t"
// copy values
"mov %0, %%eax\n\t"
"mov %%eax, %%edx\n\t"
"dec %%edx\n\t"
"shl $2, %%edx\n\t"
"add %1, %%edx\n"
"Lcopy:\n\t"
"pushl 0(%%edx)\n\t"
"sub $4, %%edx\n\t"
"dec %%eax\n\t"
"jne Lcopy\n\t"
// do the actual call
"mov %2, %%edx\n\t"
"mov 0(%%edx), %%edx\n\t"
"mov %3, %%eax\n\t"
"shl $2, %%eax\n\t"
"add %%eax, %%edx\n\t"
"mov 0(%%edx), %%edx\n\t"
"call *%%edx\n\t"
// save return registers
"mov %%eax, %4\n\t"
"mov %%edx, %5\n\t"
// cleanup stack
"mov %6, %%esp\n\t"
:
: "m"(nStackLongs), "m"(pStackLongs), "m"(pAdjustedThisPtr),
"m"(nVtableIndex), "m"(eax), "m"(edx), "m"(stackptr)
: "eax", "ecx", "edx" );
switch( returnType->eTypeClass )
{
case typelib_TypeClass_VOID:
break;
case typelib_TypeClass_HYPER:
case typelib_TypeClass_UNSIGNED_HYPER:
((long*)pRegisterReturn)[1] = edx;
case typelib_TypeClass_LONG:
case typelib_TypeClass_UNSIGNED_LONG:
case typelib_TypeClass_CHAR:
case typelib_TypeClass_ENUM:
((long*)pRegisterReturn)[0] = eax;
break;
case typelib_TypeClass_SHORT:
case typelib_TypeClass_UNSIGNED_SHORT:
*(unsigned short*)pRegisterReturn = eax;
break;
case typelib_TypeClass_BOOLEAN:
case typelib_TypeClass_BYTE:
*(unsigned char*)pRegisterReturn = eax;
break;
case typelib_TypeClass_FLOAT:
asm ( "fstps %0" : : "m"(*(char *)pRegisterReturn) );
break;
case typelib_TypeClass_DOUBLE:
asm ( "fstpl %0\n\t" : : "m"(*(char *)pRegisterReturn) );
break;
case typelib_TypeClass_STRUCT:
if (bridges::cpp_uno::shared::isSmallStruct(returnType)) {
if (returnType->nSize <= 1) {
*(unsigned char*)pRegisterReturn = eax;
}
else if (returnType->nSize <= 2) {
*(unsigned short*)pRegisterReturn = eax;
}
else if (returnType->nSize <= 8) {
((long*)pRegisterReturn)[0] = eax;
if (returnType->nSize > 4) {
((long*)pRegisterReturn)[1] = edx;
}
}
}
break;
default:
break;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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