158 lines
5.9 KiB
C++
158 lines
5.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#include "sal/config.h"
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#include <cassert>
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#include "cppu/macros.hxx"
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#include "sal/types.h"
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#include "typelib/typeclass.h"
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#include "typelib/typedescription.h"
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#include "callvirtualmethod.hxx"
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#include "share.hxx"
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// The call instruction within the asm block of callVirtualMethod may throw
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// exceptions. At least GCC 4.7.0 with -O0 would create (unnecessary)
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// .gcc_exception_table call-site table entries around all other calls in this
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// function that can throw, leading to std::terminate if the asm call throws an
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// exception and the unwinding C++ personality routine finds the unexpected hole
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// in the .gcc_exception_table. Therefore, make sure this function explicitly
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// only calls nothrow-functions (so GCC 4.7.0 with -O0 happens to not create a
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// .gcc_exception_table section at all for this function). For some reason,
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// this also needs to be in a source file of its own.
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//
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// Also, this file should be compiled with -fnon-call-exceptions, and ideally
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// there would be a way to tell the compiler that the asm block contains calls
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// to functions that can potentially throw; see the mail thread starting at
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// <http://gcc.gnu.org/ml/gcc/2012-03/msg00454.html> "C++: Letting compiler know
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// asm block can call function that can throw?"
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void CPPU_CURRENT_NAMESPACE::callVirtualMethod(
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void * pAdjustedThisPtr, sal_Int32 nVtableIndex, void * pRegisterReturn,
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typelib_TypeDescription * pReturnTypeDescr, bool bSimpleReturn,
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sal_Int32 * pStackLongs, sal_Int32 nStackLongs)
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{
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// parameter list is mixed list of * and values
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// reference parameters are pointers
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assert(pStackLongs && pAdjustedThisPtr);
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assert(sizeof (void *) == 4 && sizeof (sal_Int32) == 4);
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// unexpected size of int
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assert(nStackLongs && pStackLongs); // no stack
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if (! pAdjustedThisPtr) CPPU_CURRENT_NAMESPACE::dummy_can_throw_anything("xxx"); // address something
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volatile long edx = 0, eax = 0; // for register returns
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void * stackptr;
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asm volatile (
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"mov %%esp, %6\n\t"
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// preserve potential 128bit stack alignment
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"and $0xfffffff0, %%esp\n\t"
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"mov %0, %%eax\n\t"
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"lea -4(,%%eax,4), %%eax\n\t"
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"and $0xf, %%eax\n\t"
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"sub $0xc, %%eax\n\t"
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"add %%eax, %%esp\n\t"
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// copy values
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"mov %0, %%eax\n\t"
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"mov %%eax, %%edx\n\t"
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"dec %%edx\n\t"
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"shl $2, %%edx\n\t"
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"add %1, %%edx\n"
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"Lcopy:\n\t"
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"pushl 0(%%edx)\n\t"
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"sub $4, %%edx\n\t"
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"dec %%eax\n\t"
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"jne Lcopy\n\t"
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// do the actual call
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"mov %2, %%edx\n\t"
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"mov 0(%%edx), %%edx\n\t"
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"mov %3, %%eax\n\t"
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"shl $2, %%eax\n\t"
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"add %%eax, %%edx\n\t"
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"mov 0(%%edx), %%edx\n\t"
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"call *%%edx\n\t"
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// save return registers
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"mov %%eax, %4\n\t"
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"mov %%edx, %5\n\t"
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// cleanup stack
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"mov %6, %%esp\n\t"
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:
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: "m"(nStackLongs), "m"(pStackLongs), "m"(pAdjustedThisPtr),
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"m"(nVtableIndex), "m"(eax), "m"(edx), "m"(stackptr)
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: "eax", "ecx", "edx" );
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switch( pReturnTypeDescr->eTypeClass )
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{
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case typelib_TypeClass_VOID:
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break;
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case typelib_TypeClass_HYPER:
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case typelib_TypeClass_UNSIGNED_HYPER:
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((long*)pRegisterReturn)[1] = edx;
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case typelib_TypeClass_LONG:
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case typelib_TypeClass_UNSIGNED_LONG:
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case typelib_TypeClass_CHAR:
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case typelib_TypeClass_ENUM:
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((long*)pRegisterReturn)[0] = eax;
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break;
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case typelib_TypeClass_SHORT:
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case typelib_TypeClass_UNSIGNED_SHORT:
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*(unsigned short*)pRegisterReturn = eax;
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break;
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case typelib_TypeClass_BOOLEAN:
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case typelib_TypeClass_BYTE:
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*(unsigned char*)pRegisterReturn = eax;
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break;
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case typelib_TypeClass_FLOAT:
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asm ( "fstps %0" : : "m"(*(char *)pRegisterReturn) );
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break;
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case typelib_TypeClass_DOUBLE:
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asm ( "fstpl %0\n\t" : : "m"(*(char *)pRegisterReturn) );
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break;
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default:
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{
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#if defined (FREEBSD) || defined(NETBSD) || defined(OPENBSD) || defined(MACOSX) || \
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defined(DRAGONFLY)
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sal_Int32 const nRetSize = pReturnTypeDescr->nSize;
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if (bSimpleReturn && nRetSize <= 8 && nRetSize > 0)
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{
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if (nRetSize > 4)
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static_cast<long *>(pRegisterReturn)[1] = edx;
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static_cast<long *>(pRegisterReturn)[0] = eax;
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}
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#else
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(void)bSimpleReturn;
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#endif
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break;
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}
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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