diff options
Diffstat (limited to 'bridges/source/cpp_uno/gcc3_linux_intel/callvirtualmethod.cxx')
| -rw-r--r-- | bridges/source/cpp_uno/gcc3_linux_intel/callvirtualmethod.cxx | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/bridges/source/cpp_uno/gcc3_linux_intel/callvirtualmethod.cxx b/bridges/source/cpp_uno/gcc3_linux_intel/callvirtualmethod.cxx new file mode 100644 index 000000000..b0b160b24 --- /dev/null +++ b/bridges/source/cpp_uno/gcc3_linux_intel/callvirtualmethod.cxx @@ -0,0 +1,150 @@ +/* -*- 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 <cassert> + +#include <cppu/macros.hxx> +#include <sal/types.h> +#include <typelib/typeclass.h> +#include <typelib/typedescription.h> + +#include "callvirtualmethod.hxx" +#include "share.hxx" + +// The call instruction within the asm block of callVirtualMethod may throw +// exceptions. At least GCC 4.7.0 with -O0 would create (unnecessary) +// .gcc_exception_table call-site table entries around all other calls in this +// function that can throw, leading to std::terminate if the asm call throws an +// exception and the unwinding C++ personality routine finds the unexpected hole +// in the .gcc_exception_table. Therefore, make sure this function explicitly +// only calls nothrow-functions (so GCC 4.7.0 with -O0 happens to not create a +// .gcc_exception_table section at all for this function). For some reason, +// this also needs to be in a source file of its own. +// +// Also, this file should be compiled with -fnon-call-exceptions, and ideally +// there would be a way to tell the compiler that the asm block contains calls +// to functions that can potentially throw; see the mail thread starting at +// <http://gcc.gnu.org/ml/gcc/2012-03/msg00454.html> "C++: Letting compiler know +// asm block can call function that can throw?" + +void CPPU_CURRENT_NAMESPACE::callVirtualMethod( + void * pAdjustedThisPtr, sal_Int32 nVtableIndex, void * pRegisterReturn, + typelib_TypeDescription * pReturnTypeDescr, bool bSimpleReturn, + sal_Int32 * pStackLongs, sal_Int32 nStackLongs) +{ + // parameter list is mixed list of * and values + // reference parameters are pointers + + assert(pStackLongs && pAdjustedThisPtr); + assert(sizeof (void *) == 4 && sizeof (sal_Int32) == 4); + // unexpected size of int + assert(nStackLongs && pStackLongs); // no stack + +#if defined __clang__ + if (! pAdjustedThisPtr) CPPU_CURRENT_NAMESPACE::dummy_can_throw_anything("xxx"); // address something +#endif + + long edx, eax; // for register returns + void * stackptr; + asm volatile ( + "mov %%esp, %2\n\t" + // preserve potential 128bit stack alignment + "and $0xfffffff0, %%esp\n\t" + "mov %3, %%eax\n\t" + "lea -4(,%%eax,4), %%eax\n\t" + "and $0xf, %%eax\n\t" + "sub $0xc, %%eax\n\t" + "add %%eax, %%esp\n\t" + // copy values + "mov %3, %%eax\n\t" + "mov %%eax, %%edx\n\t" + "dec %%edx\n\t" + "shl $2, %%edx\n\t" + "add %4, %%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 %5, %%edx\n\t" + "mov 0(%%edx), %%edx\n\t" + "mov %6, %%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, %0\n\t" + "mov %%edx, %1\n\t" + // cleanup stack + "mov %2, %%esp\n\t" + : "=m"(eax), "=m"(edx), "=m"(stackptr) + : "m"(nStackLongs), "m"(pStackLongs), "m"(pAdjustedThisPtr), "m"(nVtableIndex) + : "eax", "ecx", "edx" ); + switch( pReturnTypeDescr->eTypeClass ) + { + case typelib_TypeClass_VOID: + break; + case typelib_TypeClass_HYPER: + case typelib_TypeClass_UNSIGNED_HYPER: + static_cast<long*>(pRegisterReturn)[1] = edx; + [[fallthrough]]; + case typelib_TypeClass_LONG: + case typelib_TypeClass_UNSIGNED_LONG: + case typelib_TypeClass_CHAR: + case typelib_TypeClass_ENUM: + static_cast<long*>(pRegisterReturn)[0] = eax; + break; + case typelib_TypeClass_SHORT: + case typelib_TypeClass_UNSIGNED_SHORT: + *static_cast<unsigned short*>(pRegisterReturn) = eax; + break; + case typelib_TypeClass_BOOLEAN: + case typelib_TypeClass_BYTE: + *static_cast<unsigned char*>(pRegisterReturn) = eax; + break; + case typelib_TypeClass_FLOAT: + asm ( "fstps %0" : : "m"(*static_cast<char *>(pRegisterReturn)) ); + break; + case typelib_TypeClass_DOUBLE: + asm ( "fstpl %0\n\t" : : "m"(*static_cast<char *>(pRegisterReturn)) ); + break; + default: + { +#if defined (FREEBSD) || defined(NETBSD) || defined(OPENBSD) || defined(MACOSX) || \ + defined(DRAGONFLY) + sal_Int32 const nRetSize = pReturnTypeDescr->nSize; + if (bSimpleReturn && nRetSize <= 8 && nRetSize > 0) + { + if (nRetSize > 4) + static_cast<long *>(pRegisterReturn)[1] = edx; + static_cast<long *>(pRegisterReturn)[0] = eax; + } +#else + (void)bSimpleReturn; +#endif + break; + } + } +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |