/* -*- 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 <malloc.h>
#include <typeinfo.h>
#include <signal.h>
#include <rtl/alloc.h>
#include <rtl/strbuf.hxx>
#include <rtl/ustrbuf.hxx>
#include <sal/log.hxx>
#include <osl/mutex.hxx>
#include <com/sun/star/uno/Any.hxx>
#include <unordered_map>
#include "msci.hxx"
#include <except.hxx>
#pragma pack(push, 8)
using namespace ::com::sun::star::uno;
using namespace ::std;
using namespace ::osl;
namespace CPPU_CURRENT_NAMESPACE
{
static inline OUString toUNOname( OUString const & rRTTIname ) throw ()
{
OUStringBuffer aRet( 64 );
OUString aStr( rRTTIname.copy( 4, rRTTIname.getLength()-4-2 ) ); // filter .?AUzzz@yyy@xxx@@
sal_Int32 nPos = aStr.getLength();
while (nPos > 0)
{
sal_Int32 n = aStr.lastIndexOf( '@', nPos );
aRet.append( aStr.copy( n +1, nPos -n -1 ) );
if (n >= 0)
{
aRet.append( '.' );
}
nPos = n;
}
return aRet.makeStringAndClear();
}
static inline OUString toRTTIname( OUString const & rUNOname ) throw ()
{
OUStringBuffer aRet( 64 );
aRet.appendAscii( ".?AV" ); // class ".?AV"; struct ".?AU"
sal_Int32 nPos = rUNOname.getLength();
while (nPos > 0)
{
sal_Int32 n = rUNOname.lastIndexOf( '.', nPos );
aRet.append( rUNOname.copy( n +1, nPos -n -1 ) );
aRet.append( '@' );
nPos = n;
}
aRet.append( '@' );
return aRet.makeStringAndClear();
}
//#### RTTI simulation #############################################################################
typedef std::unordered_map< OUString, void * > t_string2PtrMap;
class RTTInfos
{
Mutex _aMutex;
t_string2PtrMap _allRTTI;
static OUString toRawName( OUString const & rUNOname ) throw ();
public:
type_info * getRTTI( OUString const & rUNOname ) throw ();
RTTInfos();
~RTTInfos();
};
class __type_info
{
friend type_info * RTTInfos::getRTTI( OUString const & ) throw ();
friend int msci_filterCppException(
LPEXCEPTION_POINTERS, uno_Any *, uno_Mapping * );
public:
virtual ~__type_info() throw ();
inline __type_info( void * m_data, const char * m_d_name ) throw ()
: _m_data( m_data )
{ ::strcpy( _m_d_name, m_d_name ); } // #100211# - checked
private:
void * _m_data;
char _m_d_name[1];
};
__type_info::~__type_info() throw ()
{
}
type_info * RTTInfos::getRTTI( OUString const & rUNOname ) throw ()
{
// a must be
static_assert(sizeof(__type_info) == sizeof(type_info), "### type info structure size differ!");
MutexGuard aGuard( _aMutex );
t_string2PtrMap::const_iterator const iFind( _allRTTI.find( rUNOname ) );
// check if type is already available
if (iFind == _allRTTI.end())
{
// insert new type_info
OString aRawName( OUStringToOString( toRTTIname( rUNOname ), RTL_TEXTENCODING_ASCII_US ) );
__type_info * pRTTI = new( std::malloc( sizeof(__type_info) + aRawName.getLength() ) )
__type_info( NULL, aRawName.getStr() );
// put into map
pair< t_string2PtrMap::iterator, bool > insertion(
_allRTTI.insert( t_string2PtrMap::value_type( rUNOname, pRTTI ) ) );
assert(insertion.second && "### rtti insertion failed?!");
return reinterpret_cast<type_info*>(pRTTI);
}
else
{
return reinterpret_cast<type_info*>(iFind->second);
}
}
RTTInfos::RTTInfos() throw ()
{
}
RTTInfos::~RTTInfos() throw ()
{
SAL_INFO("bridges", "> freeing generated RTTI infos... <");
MutexGuard aGuard( _aMutex );
for ( t_string2PtrMap::const_iterator iPos( _allRTTI.begin() );
iPos != _allRTTI.end(); ++iPos )
{
__type_info * pType = reinterpret_cast<__type_info*>(iPos->second);
pType->~__type_info(); // obsolete, but good style...
std::free( pType );
}
}
//#### Exception raising ###########################################################################
struct ObjectFunction
{
char somecode[12];
typelib_TypeDescription * _pTypeDescr; // type of object
inline static void * operator new ( size_t nSize );
inline static void operator delete ( void * pMem );
ObjectFunction( typelib_TypeDescription * pTypeDescr, void * fpFunc ) throw ();
~ObjectFunction() throw ();
};
inline void * ObjectFunction::operator new ( size_t nSize )
{
void * pMem = std::malloc( nSize );
if (pMem != 0)
{
DWORD old_protect;
BOOL success =
VirtualProtect(pMem, nSize, PAGE_EXECUTE_READWRITE, &old_protect);
(void) success;
assert(success && "VirtualProtect() failed!");
}
return pMem;
}
inline void ObjectFunction::operator delete ( void * pMem )
{
std::free( pMem );
}
ObjectFunction::ObjectFunction( typelib_TypeDescription * pTypeDescr, void * fpFunc ) throw ()
: _pTypeDescr( pTypeDescr )
{
::typelib_typedescription_acquire( _pTypeDescr );
unsigned char * pCode = (unsigned char *)somecode;
// a must be!
assert((void *)this == (void *)pCode);
// push ObjectFunction this
*pCode++ = 0x68;
*(void **)pCode = this;
pCode += sizeof(void *);
// jmp rel32 fpFunc
*pCode++ = 0xe9;
*(sal_Int32 *)pCode = ((unsigned char *)fpFunc) - pCode - sizeof(sal_Int32);
}
ObjectFunction::~ObjectFunction() throw ()
{
::typelib_typedescription_release( _pTypeDescr );
}
static void * __cdecl __copyConstruct( void * pExcThis, void * pSource, ObjectFunction * pThis )
throw ()
{
::uno_copyData( pExcThis, pSource, pThis->_pTypeDescr, cpp_acquire );
return pExcThis;
}
static void * __cdecl __destruct( void * pExcThis, ObjectFunction * pThis )
throw ()
{
::uno_destructData( pExcThis, pThis->_pTypeDescr, cpp_release );
return pExcThis;
}
// these are non virtual object methods; there is no this ptr on stack => ecx supplies _this_ ptr
static __declspec(naked) void copyConstruct() throw ()
{
__asm
{
// ObjectFunction this already on stack
push [esp+8] // source exc object this
push ecx // exc object
call __copyConstruct
add esp, 12 // + ObjectFunction this
ret 4
}
}
static __declspec(naked) void destruct() throw ()
{
__asm
{
// ObjectFunction this already on stack
push ecx // exc object
call __destruct
add esp, 8 // + ObjectFunction this
ret
}
}
struct ExceptionType
{
sal_Int32 _n0;
type_info * _pTypeInfo;
sal_Int32 _n1, _n2, _n3, _n4;
ObjectFunction * _pCopyCtor;
sal_Int32 _n5;
explicit ExceptionType( typelib_TypeDescription * pTypeDescr ) throw ()
: _n0( 0 )
, _n1( 0 )
, _n2( -1 )
, _n3( 0 )
, _n4( pTypeDescr->nSize )
, _pCopyCtor( new ObjectFunction( pTypeDescr, copyConstruct ) )
, _n5( 0 )
{
_pTypeInfo = msci_getRTTI( pTypeDescr->pTypeName );
}
~ExceptionType() throw ()
{
delete _pCopyCtor;
}
// Copy assignment is forbidden and not implemented.
ExceptionType (const ExceptionType &) = delete;
ExceptionType & operator= (const ExceptionType &) = delete;
};
struct RaiseInfo
{
sal_Int32 _n0;
ObjectFunction * _pDtor;
sal_Int32 _n2;
void * _types;
sal_Int32 _n3, _n4;
explicit RaiseInfo( typelib_TypeDescription * pTypeDescr ) throw ();
~RaiseInfo() throw ();
};
RaiseInfo::RaiseInfo( typelib_TypeDescription * pTypeDescr ) throw ()
: _n0( 0 )
, _pDtor( new ObjectFunction( pTypeDescr, destruct ) )
, _n2( 0 )
, _n3( 0 )
, _n4( 0 )
{
// a must be
static_assert(sizeof(sal_Int32) == sizeof(ExceptionType *), "### pointer size differs from sal_Int32!");
typelib_CompoundTypeDescription * pCompTypeDescr;
// info count
sal_Int32 nLen = 0;
for ( pCompTypeDescr = (typelib_CompoundTypeDescription*)pTypeDescr;
pCompTypeDescr; pCompTypeDescr = pCompTypeDescr->pBaseTypeDescription )
{
++nLen;
}
// info count accompanied by type info ptrs: type, base type, base base type, ...
_types = std::malloc( sizeof(sal_Int32) + (sizeof(ExceptionType *) * nLen) );
*(sal_Int32 *)_types = nLen;
ExceptionType ** ppTypes = (ExceptionType **)((sal_Int32 *)_types + 1);
sal_Int32 nPos = 0;
for ( pCompTypeDescr = (typelib_CompoundTypeDescription*)pTypeDescr;
pCompTypeDescr; pCompTypeDescr = pCompTypeDescr->pBaseTypeDescription )
{
ppTypes[nPos++] = new ExceptionType( (typelib_TypeDescription *)pCompTypeDescr );
}
}
RaiseInfo::~RaiseInfo() throw ()
{
ExceptionType ** ppTypes = (ExceptionType **)((sal_Int32 *)_types + 1);
for ( sal_Int32 nTypes = *(sal_Int32 *)_types; nTypes--; )
{
delete ppTypes[nTypes];
}
std::free( _types );
delete _pDtor;
}
class ExceptionInfos
{
Mutex _aMutex;
t_string2PtrMap _allRaiseInfos;
public:
static void * getRaiseInfo( typelib_TypeDescription * pTypeDescr ) throw ();
ExceptionInfos() throw ();
~ExceptionInfos() throw ();
};
ExceptionInfos::ExceptionInfos() throw ()
{
}
ExceptionInfos::~ExceptionInfos() throw ()
{
SAL_INFO("bridges", "> freeing exception infos... <");
MutexGuard aGuard( _aMutex );
for ( t_string2PtrMap::const_iterator iPos( _allRaiseInfos.begin() );
iPos != _allRaiseInfos.end(); ++iPos )
{
delete reinterpret_cast<RaiseInfo*>(iPos->second);
}
}
void * ExceptionInfos::getRaiseInfo( typelib_TypeDescription * pTypeDescr ) throw ()
{
static ExceptionInfos * s_pInfos = 0;
if (! s_pInfos)
{
MutexGuard aGuard( Mutex::getGlobalMutex() );
if (! s_pInfos)
{
s_pInfos = new ExceptionInfos();
}
}
assert( pTypeDescr &&
(pTypeDescr->eTypeClass == typelib_TypeClass_STRUCT ||
pTypeDescr->eTypeClass == typelib_TypeClass_EXCEPTION) );
void * pRaiseInfo;
OUString const & rTypeName = OUString::unacquired( &pTypeDescr->pTypeName );
MutexGuard aGuard( s_pInfos->_aMutex );
t_string2PtrMap::const_iterator const iFind(
s_pInfos->_allRaiseInfos.find( rTypeName ) );
if (iFind == s_pInfos->_allRaiseInfos.end())
{
pRaiseInfo = new RaiseInfo( pTypeDescr );
// put into map
pair< t_string2PtrMap::iterator, bool > insertion(
s_pInfos->_allRaiseInfos.insert( t_string2PtrMap::value_type( rTypeName, pRaiseInfo ) ) );
assert(insertion.second && "### raise info insertion failed?!");
}
else
{
// reuse existing info
pRaiseInfo = iFind->second;
}
return pRaiseInfo;
}
//#### exported ####################################################################################
type_info * msci_getRTTI( OUString const & rUNOname )
{
static RTTInfos * s_pRTTIs = 0;
if (! s_pRTTIs)
{
MutexGuard aGuard( Mutex::getGlobalMutex() );
if (! s_pRTTIs)
{
s_pRTTIs = new RTTInfos();
}
}
return s_pRTTIs->getRTTI( rUNOname );
}
void msci_raiseException( uno_Any * pUnoExc, uno_Mapping * pUno2Cpp )
{
// no ctor/dtor in here: this leads to dtors called twice upon RaiseException()!
// thus this obj file will be compiled without opt, so no inlining of
// ExceptionInfos::getRaiseInfo()
// construct cpp exception object
typelib_TypeDescription * pTypeDescr = 0;
TYPELIB_DANGER_GET( &pTypeDescr, pUnoExc->pType );
void * pCppExc = alloca( pTypeDescr->nSize );
::uno_copyAndConvertData( pCppExc, pUnoExc->pData, pTypeDescr, pUno2Cpp );
// a must be
static_assert(sizeof(sal_Int32) == sizeof(void *),
"### pointer size differs from sal_Int32!" );
DWORD arFilterArgs[3];
arFilterArgs[0] = MSVC_magic_number;
arFilterArgs[1] = (DWORD)pCppExc;
arFilterArgs[2] = (DWORD)ExceptionInfos::getRaiseInfo( pTypeDescr );
// destruct uno exception
::uno_any_destruct( pUnoExc, 0 );
TYPELIB_DANGER_RELEASE( pTypeDescr );
// last point to release anything not affected by stack unwinding
RaiseException( MSVC_ExceptionCode, EXCEPTION_NONCONTINUABLE, 3, arFilterArgs );
}
namespace
{
// This function does the same check as __CxxDetectRethrow from msvcrt (see its
// crt/src/vcruntime/mgdframe.cpp). But it does not alter the global state, i.e. it does not
// increment __ProcessingThrow, and so does not break following exception handling. We rely on the
// definition of EHExceptionRecord, PER_IS_MSVC_EH and PER_PTHROW, that are current as of msvcrt
// 2017 (14.14.26428).
bool DetectRethrow(void* ppExcept)
{
struct EHExceptionRecord
{
DWORD ExceptionCode;
DWORD ExceptionFlags;
struct _EXCEPTION_RECORD* ExceptionRecord;
PVOID ExceptionAddress;
DWORD NumberParameters;
struct EHParameters
{
DWORD magicNumber;
PVOID pExceptionObject;
PVOID pThrowInfo;
} params;
};
constexpr auto PER_IS_MSVC_EH = [](EHExceptionRecord* p) {
constexpr DWORD EH_EXCEPTION_NUMBER = 0xE06D7363; // The NT Exception # that msvcrt uses ('msc' | 0xE0000000)
constexpr DWORD EH_MAGIC_NUMBER1 = 0x19930520; // latest magic # in thrown object
constexpr DWORD EH_MAGIC_NUMBER2 = 0x19930521; // latest magic # in func info for exception specs
constexpr DWORD EH_MAGIC_NUMBER3 = 0x19930522; // latest magic #
constexpr DWORD EH_EXCEPTION_PARAMETERS = 3; // Number of parameters in exception record for x86
return p->ExceptionCode == EH_EXCEPTION_NUMBER
&& p->NumberParameters == EH_EXCEPTION_PARAMETERS
&& (p->params.magicNumber == EH_MAGIC_NUMBER1
|| p->params.magicNumber == EH_MAGIC_NUMBER2
|| p->params.magicNumber == EH_MAGIC_NUMBER3);
};
constexpr auto PER_PTHROW = [](EHExceptionRecord* p) {
return p->params.pThrowInfo;
};
EHExceptionRecord* pExcept;
if (!ppExcept)
return false;
pExcept = *static_cast<EHExceptionRecord**>(ppExcept);
if (PER_IS_MSVC_EH(pExcept) && PER_PTHROW(pExcept) == nullptr)
{
return true;
}
return false;
}
}
int msci_filterCppException(
EXCEPTION_POINTERS * pPointers, uno_Any * pUnoExc, uno_Mapping * pCpp2Uno )
{
if (pPointers == 0)
return EXCEPTION_CONTINUE_SEARCH;
EXCEPTION_RECORD * pRecord = pPointers->ExceptionRecord;
// handle only C++ exceptions:
if (pRecord == 0 || pRecord->ExceptionCode != MSVC_ExceptionCode)
return EXCEPTION_CONTINUE_SEARCH;
const bool rethrow = DetectRethrow(&pRecord);
assert(pRecord == pPointers->ExceptionRecord);
if (rethrow && pRecord == pPointers->ExceptionRecord)
{
pRecord = *reinterpret_cast< EXCEPTION_RECORD ** >(__current_exception());
}
// rethrow: handle only C++ exceptions:
if (pRecord == 0 || pRecord->ExceptionCode != MSVC_ExceptionCode)
return EXCEPTION_CONTINUE_SEARCH;
if (pRecord->NumberParameters == 3 &&
// pRecord->ExceptionInformation[ 0 ] == MSVC_magic_number &&
pRecord->ExceptionInformation[ 1 ] != 0 &&
pRecord->ExceptionInformation[ 2 ] != 0)
{
void * types = reinterpret_cast< RaiseInfo * >(
pRecord->ExceptionInformation[ 2 ] )->_types;
if (types != 0 && *reinterpret_cast< DWORD * >( types ) > 0) // count
{
ExceptionType * pType = *reinterpret_cast< ExceptionType ** >(
reinterpret_cast< DWORD * >( types ) + 1 );
if (pType != 0 && pType->_pTypeInfo != 0)
{
OUString aRTTIname(
OStringToOUString(
reinterpret_cast< __type_info * >(
pType->_pTypeInfo )->_m_d_name,
RTL_TEXTENCODING_ASCII_US ) );
OUString aUNOname( toUNOname( aRTTIname ) );
typelib_TypeDescription * pExcTypeDescr = 0;
typelib_typedescription_getByName(
&pExcTypeDescr, aUNOname.pData );
if (pExcTypeDescr == 0)
{
OUStringBuffer buf;
buf.append(
"[msci_uno bridge error] UNO type of "
"C++ exception unknown: \"" );
buf.append( aUNOname );
buf.append( "\", RTTI-name=\"" );
buf.append( aRTTIname );
buf.append( "\"!" );
RuntimeException exc( buf.makeStringAndClear() );
uno_type_any_constructAndConvert(
pUnoExc, &exc,
cppu::UnoType<decltype(exc)>::get().getTypeLibType(), pCpp2Uno );
// msvcr80.dll cleans up, different from former msvcrs
// if (! rethrow):
// though this unknown exception leaks now, no user-defined
// exception is ever thrown through the binary C-UNO dispatcher
// call stack.
}
else
{
// construct uno exception any
uno_any_constructAndConvert(
pUnoExc, (void *) pRecord->ExceptionInformation[1],
pExcTypeDescr, pCpp2Uno );
typelib_typedescription_release( pExcTypeDescr );
}
return EXCEPTION_EXECUTE_HANDLER;
}
}
}
// though this unknown exception leaks now, no user-defined exception
// is ever thrown through the binary C-UNO dispatcher call stack.
RuntimeException exc( "[msci_uno bridge error] unexpected "
"C++ exception occurred!" );
uno_type_any_constructAndConvert(
pUnoExc, &exc, cppu::UnoType<decltype(exc)>::get().getTypeLibType(), pCpp2Uno );
return EXCEPTION_EXECUTE_HANDLER;
}
}
#pragma pack(pop)
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
↑ V547 Expression '!s_pInfos' is always true.
↑ V522 There might be dereferencing of a potential null pointer.
↑ V547 Expression '!s_pRTTIs' is always true.
↑ V730 Not all members of a class are initialized inside the constructor. Consider inspecting: somecode.
↑ V522 There might be dereferencing of a potential null pointer '(sal_Int32 *) _types'. Check lines: 333, 332.