138 lines
5.2 KiB
C++
138 lines
5.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include "sal/config.h"
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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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#include "smallstruct.hxx"
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// For some reason, callVirtualMethod needs to be in a source file of its own,
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// so that stack unwinding upon a thrown exception from within the asm block
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// call works, at least with GCC 4.7.0 and --enable-dbgutil.
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// The call instruction within the asm section of callVirtualMethod may throw
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// exceptions. So that the compiler handles this correctly, it is important
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// that (a) callVirtualMethod might call dummy_can_throw_anything (although this
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// never happens at runtime), which in turn can throw exceptions, and (b)
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// callVirtualMethod is not inlined at its call site (so that any exceptions are
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// caught which are thrown from the instruction calling callVirtualMethod). [It
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// is unclear how much of this comment is still relevant -- see the above
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// comment.]
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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 const * returnType, sal_Int32 * pStackLongs,
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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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static_assert( (sizeof(void *) == 4) && (sizeof(sal_Int32) == 4), "### unexpected size of int!");
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assert(nStackLongs && pStackLongs && "### no stack in callVirtualMethod !");
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// never called
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if (! pAdjustedThisPtr) CPPU_CURRENT_NAMESPACE::dummy_can_throw_anything("xxx"); // address something
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long edx, eax; // for register returns
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void * stackptr;
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asm volatile (
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"mov %%esp, %2\n\t"
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// copy values
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"mov %3, %%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 %4, %%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 %5, %%edx\n\t"
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"mov 0(%%edx), %%edx\n\t"
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"mov %6, %%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, %0\n\t"
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"mov %%edx, %1\n\t"
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// cleanup stack
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"mov %2, %%esp\n\t"
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: "=m"(eax), "=m"(edx), "=m"(stackptr)
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: "m"(nStackLongs), "m"(pStackLongs), "m"(pAdjustedThisPtr), "m"(nVtableIndex)
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: "eax", "ecx", "edx" );
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switch( returnType->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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case typelib_TypeClass_STRUCT:
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if (bridges::cpp_uno::shared::isSmallStruct(returnType)) {
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if (returnType->nSize <= 1) {
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*(unsigned char*)pRegisterReturn = eax;
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}
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else if (returnType->nSize <= 2) {
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*(unsigned short*)pRegisterReturn = eax;
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}
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else if (returnType->nSize <= 8) {
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((long*)pRegisterReturn)[0] = eax;
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if (returnType->nSize > 4) {
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((long*)pRegisterReturn)[1] = edx;
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}
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}
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}
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break;
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default:
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break;
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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