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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 <stdio.h>
#include <string.h>
#include <rtl/ustrbuf.hxx>
#include <sal/log.hxx>
#include <com/sun/star/uno/genfunc.hxx>
#include <com/sun/star/uno/RuntimeException.hpp>
#include <typelib/typedescription.hxx>
#include <uno/any2.h>
#include "rtti.hxx"
#include "share.hxx"
using namespace ::std;
using namespace ::com::sun::star::uno;
using namespace ::__cxxabiv1;
namespace CPPU_CURRENT_NAMESPACE
{
static OUString toUNOname( char const * p )
{
#if OSL_DEBUG_LEVEL > 1
char const * start = p;
#endif
// example: N3com3sun4star4lang24IllegalArgumentExceptionE
OUStringBuffer buf( 64 );
assert( *p == 'N' );
++p; // skip N
while (*p != 'E')
{
// read chars count
int n = *p++ - '0';
while ('0' <= *p && '9' >= *p)
{
n *= 10;
n += (*p++ - '0');
}
buf.appendAscii( p, n );
p += n;
if (*p != 'E')
buf.append( '.' );
}
#if OSL_DEBUG_LEVEL > 1
OUString ret( buf.makeStringAndClear() );
OString c_ret( OUStringToOString( ret, RTL_TEXTENCODING_ASCII_US ) );
fprintf( stderr, "> toUNOname(): %s => %s\n", start, c_ret.getStr() );
return ret;
#else
return buf.makeStringAndClear();
#endif
}
extern "C" {
static void _GLIBCXX_CDTOR_CALLABI deleteException( void * pExc )
{
__cxxabiv1::__cxa_exception const * header = static_cast<__cxxabiv1::__cxa_exception const *>(pExc) - 1;
typelib_TypeDescription * pTD = nullptr;
OUString unoName( toUNOname( header->exceptionType->name() ) );
::typelib_typedescription_getByName( &pTD, unoName.pData );
assert(pTD && "### unknown exception type! leaving out destruction => leaking!!!");
if (pTD)
{
::uno_destructData( pExc, pTD, cpp_release );
::typelib_typedescription_release( pTD );
}
}
}
void raiseException( uno_Any * pUnoExc, uno_Mapping * pUno2Cpp )
{
#if OSL_DEBUG_LEVEL > 1
OString cstr(
OUStringToOString(
OUString::unacquired( &pUnoExc->pType->pTypeName ),
RTL_TEXTENCODING_ASCII_US ) );
fprintf( stderr, "> uno exception occurred: %s\n", cstr.getStr() );
#endif
void * pCppExc;
type_info * rtti;
{
// construct cpp exception object
typelib_TypeDescription * pTypeDescr = nullptr;
TYPELIB_DANGER_GET( &pTypeDescr, pUnoExc->pType );
assert(pTypeDescr);
if (! pTypeDescr)
{
throw RuntimeException(
"cannot get typedescription for type " +
OUString::unacquired( &pUnoExc->pType->pTypeName ) );
}
pCppExc = __cxxabiv1::__cxa_allocate_exception( pTypeDescr->nSize );
::uno_copyAndConvertData( pCppExc, pUnoExc->pData, pTypeDescr, pUno2Cpp );
// destruct uno exception
::uno_any_destruct( pUnoExc, nullptr );
// avoiding locked counts
rtti = x86_64::getRtti(*pTypeDescr);
TYPELIB_DANGER_RELEASE( pTypeDescr );
assert(rtti && "### no rtti for throwing exception!");
if (! rtti)
{
throw RuntimeException(
"no rtti for type " +
OUString::unacquired( &pUnoExc->pType->pTypeName ) );
}
}
__cxxabiv1::__cxa_throw( pCppExc, rtti, deleteException );
}
void fillUnoException(uno_Any * pUnoExc, uno_Mapping * pCpp2Uno)
{
__cxxabiv1::__cxa_exception * header = __cxxabiv1::__cxa_get_globals()->caughtExceptions;
if (! header)
{
RuntimeException aRE( "no exception header!" );
Type const & rType = cppu::UnoType<decltype(aRE)>::get();
uno_type_any_constructAndConvert( pUnoExc, &aRE, rType.getTypeLibType(), pCpp2Uno );
SAL_WARN("bridges", aRE.Message);
return;
}
#if defined _LIBCPPABI_VERSION // detect libc++abi
// Very bad HACK to find out whether we run against a libcxxabi that has a new
// __cxa_exception::reserved member at the start, introduced with LLVM 10
// <https://github.com/llvm/llvm-project/commit/674ec1eb16678b8addc02a4b0534ab383d22fa77>
// "[libcxxabi] Insert padding in __cxa_exception struct for compatibility". The layout of the
// start of __cxa_exception is
//
// [8 byte void *reserve]
// 8 byte size_t referenceCount
//
// where the (bad, hacky) assumption is that reserve (if present) is null
// (__cxa_allocate_exception in at least LLVM 11 zero-fills the object, and nothing actively
// sets reserve) while referenceCount is non-null (__cxa_throw sets it to 1, and
// __cxa_decrement_exception_refcount destroys the exception as soon as it drops to 0; for a
// __cxa_dependent_exception, the referenceCount member is rather
//
// 8 byte void* primaryException
//
// but which also will always be set to a non-null value in __cxa_rethrow_primary_exception).
// As described in the definition of __cxa_exception
// (bridges/source/cpp_uno/gcc3_linux_x86-64/share.hxx), this hack (together with the "#if 0"
// there) can be dropped once we can be sure that we only run against new libcxxabi that has the
// reserve member:
if (*reinterpret_cast<void **>(header) == nullptr) {
header = reinterpret_cast<__cxxabiv1::__cxa_exception*>(reinterpret_cast<void **>(header) + 1);
}
#endif
std::type_info *exceptionType = __cxxabiv1::__cxa_current_exception_type();
typelib_TypeDescription * pExcTypeDescr = nullptr;
OUString unoName( toUNOname( exceptionType->name() ) );
#if OSL_DEBUG_LEVEL > 1
OString cstr_unoName( OUStringToOString( unoName, RTL_TEXTENCODING_ASCII_US ) );
fprintf( stderr, "> c++ exception occurred: %s\n", cstr_unoName.getStr() );
#endif
typelib_typedescription_getByName( &pExcTypeDescr, unoName.pData );
if (pExcTypeDescr == nullptr)
{
RuntimeException aRE( "exception type not found: " + unoName );
Type const & rType = cppu::UnoType<decltype(aRE)>::get();
uno_type_any_constructAndConvert( pUnoExc, &aRE, rType.getTypeLibType(), pCpp2Uno );
SAL_WARN("bridges", aRE.Message);
}
else
{
// construct uno exception any
uno_any_constructAndConvert( pUnoExc, header->adjustedPtr, pExcTypeDescr, pCpp2Uno );
typelib_typedescription_release( pExcTypeDescr );
}
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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