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Diffstat (limited to 'bridges/source/cpp_uno/gcc3_ios/except.cxx')
| -rw-r--r-- | bridges/source/cpp_uno/gcc3_ios/except.cxx | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/bridges/source/cpp_uno/gcc3_ios/except.cxx b/bridges/source/cpp_uno/gcc3_ios/except.cxx new file mode 100644 index 000000000000..1d1eeccd97ae --- /dev/null +++ b/bridges/source/cpp_uno/gcc3_ios/except.cxx @@ -0,0 +1,379 @@ +/* -*- 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 <new> +#include <stdio.h> +#include <string.h> +#include <typeinfo> + +#include <cxxabi.h> +#include <dlfcn.h> + +#include "com/sun/star/uno/RuntimeException.hpp" +#include "com/sun/star/uno/genfunc.hxx" +#include <sal/log.hxx> +#include "osl/mutex.hxx" +#include "rtl/strbuf.hxx" +#include "rtl/ustrbuf.hxx" +#include "typelib/typedescription.h" +#include "uno/any2.h" +#include <unordered_map> +#include "share.hxx" + +using namespace ::osl; +using namespace ::com::sun::star::uno; + +namespace CPPU_CURRENT_NAMESPACE { + +namespace { + +struct Fake_type_info { + virtual ~Fake_type_info() = delete; + char const * name; +}; + +struct Fake_class_type_info: Fake_type_info { + virtual ~Fake_class_type_info() override = delete; +}; + +struct Fake_si_class_type_info: Fake_class_type_info { + virtual ~Fake_si_class_type_info() override = delete; + void const * base; +}; + +struct Base {}; +struct Derived: Base {}; + +std::type_info * createFake_class_type_info(char const * name) { + char * buf = new char[sizeof (Fake_class_type_info)]; + + *reinterpret_cast<void **>(buf) = *reinterpret_cast<void * const *>( + &typeid(Base)); + // copy __cxxabiv1::__class_type_info vtable into place + Fake_class_type_info * fake = reinterpret_cast<Fake_class_type_info *>(buf); + fake->name = name; + return reinterpret_cast<std::type_info *>( + static_cast<Fake_type_info *>(fake)); +} + +std::type_info * createFake_si_class_type_info( + char const * name, std::type_info const * base) +{ + char * buf = new char[sizeof (Fake_si_class_type_info)]; + + *reinterpret_cast<void **>(buf) = *reinterpret_cast<void * const *>( + &typeid(Derived)); + // copy __cxxabiv1::__si_class_type_info vtable into place + Fake_si_class_type_info * fake + = reinterpret_cast<Fake_si_class_type_info *>(buf); + fake->name = name; + fake->base = base; + return reinterpret_cast<std::type_info *>( + static_cast<Fake_type_info *>(fake)); +} + +} + +#ifdef __GNUC__ +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wunused-function" +#endif +void dummy_can_throw_anything( char const * ) +{ +} +#ifdef __GNUC__ +#pragma GCC diagnostic pop +#endif + +static OUString toUNOname( char const * p ) +{ +#if OSL_DEBUG_LEVEL > 1 + char const * start = p; +#endif + + // example: N3com3sun4star4lang24IllegalArgumentExceptionE + + OUStringBuffer buf( 64 ); + assert( 'N' == *p ); + ++p; // skip N + + while ('E' != *p) + { + // read chars count + long n = (*p++ - '0'); + while ('0' <= *p && '9' >= *p) + { + n *= 10; + n += (*p++ - '0'); + } + buf.appendAscii( p, n ); + p += n; + if ('E' != *p) + 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 +} + +class RTTI +{ + typedef std::unordered_map< OUString, std::type_info *, OUStringHash > t_rtti_map; + + Mutex m_mutex; + t_rtti_map m_rttis; + t_rtti_map m_generatedRttis; + + void * m_hApp; + +public: + RTTI(); + ~RTTI(); + + std::type_info * getRTTI( typelib_CompoundTypeDescription * ); +}; + +RTTI::RTTI() + : m_hApp( dlopen( nullptr, RTLD_LAZY ) ) +{ +} + +RTTI::~RTTI() +{ + dlclose( m_hApp ); +} + + +std::type_info * RTTI::getRTTI( typelib_CompoundTypeDescription *pTypeDescr ) +{ + std::type_info * rtti; + + OUString const & unoName = OUString::unacquired(&pTypeDescr->aBase.pTypeName); + + MutexGuard guard( m_mutex ); + t_rtti_map::const_iterator iFind( m_rttis.find( unoName ) ); + if (iFind == m_rttis.end()) + { + // RTTI symbol + OStringBuffer buf( 64 ); + buf.append( "_ZTIN" ); + sal_Int32 index = 0; + do + { + OUString token( unoName.getToken( 0, '.', index ) ); + buf.append( token.getLength() ); + OString c_token( OUStringToOString( token, RTL_TEXTENCODING_ASCII_US ) ); + buf.append( c_token ); + } + while (index >= 0); + buf.append( 'E' ); + + OString symName( buf.makeStringAndClear() ); + rtti = static_cast<std::type_info *>(dlsym( m_hApp, symName.getStr() )); + + if (rtti) + { + std::pair< t_rtti_map::iterator, bool > insertion( + m_rttis.insert( t_rtti_map::value_type( unoName, rtti ) ) ); + SAL_WARN_IF( !insertion.second, + "bridges", + "inserting new rtti failed" ); + } + else + { + // try to lookup the symbol in the generated rtti map + t_rtti_map::const_iterator iFind2( m_generatedRttis.find( unoName ) ); + if (iFind2 == m_generatedRttis.end()) + { + // we must generate it ! + // symbol and rtti-name is nearly identical, + // the symbol is prefixed with _ZTI + char * rttiName = strdup(symName.getStr() + 4); + if (rttiName == nullptr) { + throw std::bad_alloc(); + } +#if OSL_DEBUG_LEVEL > 1 + fprintf( stderr,"generated rtti for %s\n", rttiName ); +#endif + if (pTypeDescr->pBaseTypeDescription) + { + // ensure availability of base + std::type_info * base_rtti = getRTTI( + pTypeDescr->pBaseTypeDescription ); + rtti = createFake_si_class_type_info(rttiName, base_rtti); + } + else + { + rtti = createFake_class_type_info(rttiName); + } + + std::pair< t_rtti_map::iterator, bool > insertion( + m_generatedRttis.insert( t_rtti_map::value_type( unoName, rtti ) ) ); + SAL_WARN_IF( !insertion.second, + "bridges", + "inserting new generated rtti failed" ); + } + else // taking already generated rtti + { + rtti = iFind2->second; + } + } + } + else + { + rtti = iFind->second; + } + + return rtti; +} + + +static void deleteException( void * pExc ) +{ + __cxa_exception const * header = static_cast<__cxa_exception const *>(pExc) - 1; + // The libcxxabi commit + // <http://llvm.org/viewvc/llvm-project?view=revision&revision=303175> + // "[libcxxabi] Align unwindHeader on a double-word boundary" towards + // LLVM 5.0 changed the size of __cxa_exception by adding + // + // __attribute__((aligned)) + // + // to the final member unwindHeader, on x86-64 effectively adding a hole of + // size 8 in front of that member (changing its offset from 88 to 96, + // sizeof(__cxa_exception) from 120 to 128, and alignof(__cxa_exception) + // from 8 to 16); a hack to dynamically determine whether we run against a + // new libcxxabi is to look at the exceptionDestructor member, which must + // point to this function (the use of __cxa_exception in fillUnoException is + // unaffected, as it only accesses members towards the start of the struct, + // through a pointer known to actually point at the start): + if (header->exceptionDestructor != &deleteException) { + header = reinterpret_cast<__cxa_exception const *>( + reinterpret_cast<char const *>(header) - 8); + assert(header->exceptionDestructor == &deleteException); + } + 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; + std::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 + static RTTI * s_rtti = nullptr; + if (! s_rtti) + { + MutexGuard guard( Mutex::getGlobalMutex() ); + if (! s_rtti) + { + static RTTI rtti_data; + s_rtti = &rtti_data; + } + } + rtti = s_rtti->getRTTI( reinterpret_cast<typelib_CompoundTypeDescription *>(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( __cxa_exception * header, uno_Any * pUnoExc, uno_Mapping * pCpp2Uno ) +{ + 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; + } + + typelib_TypeDescription * pExcTypeDescr = nullptr; + OUString unoName( toUNOname( header->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 (nullptr == pExcTypeDescr) + { + 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: */ |