# Cppcheck report - LibreOffice: cli_ure/source/uno_bridge/cli_uno.cxx

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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 <sal/alloca.h>
    #include <osl/diagnose.h>
    #include "rtl/ustrbuf.hxx"
    #include "cli_base.h"
    #include "cli_bridge.h"

    namespace sr=System::Reflection;

    namespace cli_uno
    {

    union largest
    {
        sal_Int64 n;
        double d;
        void * p;
        uno_Any a;
    };

    System::Object^ Bridge::call_uno(uno_Interface * pUnoI,
                          typelib_TypeDescription* member_td,
                          typelib_TypeDescriptionReference * return_type,
                          sal_Int32 nParams, typelib_MethodParameter const * pParams,
                          array<System::Object^>^ args, array<System::Type^>^ argTypes,
                          System::Object^* ppExc) const
    {
        // return mem
        sal_Int32 return_size = sizeof (largest);
        if ((0 != return_type) &&
            (typelib_TypeClass_STRUCT == return_type->eTypeClass ||
             typelib_TypeClass_EXCEPTION == return_type->eTypeClass))
        {
            TypeDescr return_td( return_type );
            if (return_td.get()->nSize > sizeof (largest))
                return_size = return_td.get()->nSize;
        }
        //Prepare memory that contains all converted arguments and return valuse
        //The memory block contains first pointers to the arguments which are in the same block
        // For example, 2 arguments, 1 ret.
        //
        //      | Pointer
        //      | Pointer
        //      | Return value
        //      | Arg 1
        //      | Arg 2
        //
        // If an argument is larger then union largest, such as some structures, then the pointer
        // points to an extra block of memory. The same goes for a big return value.

        char * mem = (char *)alloca(
            (nParams * sizeof (void *)) + return_size + (nParams * sizeof (largest)) );
        //array of pointers to args
        void ** uno_args = (void **)mem;
        //If an attribute is set, then uno_ret must be null, e.g void setAttribute(int )
        void * uno_ret= NULL;
        if ( !(member_td->eTypeClass == typelib_TypeClass_INTERFACE_ATTRIBUTE && nParams == 1))
            uno_ret = (mem + (nParams * sizeof (void *)));
        largest * uno_args_mem = (largest *)(mem + (nParams * sizeof (void *)) + return_size);<--- C-style pointer casting

        OSL_ASSERT( (0 == nParams) || (nParams == args->Length) );
        for ( sal_Int32 nPos = 0; nPos < nParams; ++nPos )
        {
            typelib_MethodParameter const & param = pParams[ nPos ];
            typelib_TypeDescriptionReference * type = param.pTypeRef;

            uno_args[ nPos ] = &uno_args_mem[ nPos ];
            if (typelib_TypeClass_STRUCT == type->eTypeClass ||
                typelib_TypeClass_EXCEPTION == type->eTypeClass)
            {
                TypeDescr td( type );
                if (td.get()->nSize > sizeof (largest))
                    uno_args[ nPos ] = alloca( td.get()->nSize );
            }

            if (param.bIn)
            {
                try
                {
                    // in, in/out params
                    map_to_uno(
                        uno_args[ nPos ],args[nPos] , type, false /* no assign */);
                }
                catch (...)
                {
                    // cleanup uno in args
                    for (sal_Int32 n = 0; n < nPos; ++n)
                    {
                        typelib_MethodParameter const & param = pParams[n];
                        if (param.bIn)
                        {
                            uno_type_destructData(uno_args[n], param.pTypeRef, 0);
                        }
                    }
                    throw;
                }
            }
        }
        uno_Any uno_exc_holder;
        uno_Any * uno_exc = &uno_exc_holder;
        // call binary uno

        (*pUnoI->pDispatcher)( pUnoI, member_td, uno_ret, uno_args, &uno_exc );

        if (0 == uno_exc)
        {
            // convert out args; destruct uno args
            for ( sal_Int32 nPos = 0; nPos < nParams; ++nPos )
            {
                typelib_MethodParameter const & param = pParams[ nPos ];
                typelib_TypeDescriptionReference * type = param.pTypeRef;
                if (param.bOut)
                {
                    try
                    {
                        pin_ptr<System::Object^> ptr = &args[nPos];
                        map_to_cli(
                            ptr, uno_args[nPos], param.pTypeRef,
                            argTypes != nullptr ? argTypes[nPos] : nullptr, false );
                    }
                    catch (...)
                    {
                        // cleanup further uno args
                        for ( sal_Int32 n = nPos; n < nParams; ++n )
                        {
                            uno_type_destructData( uno_args[n], pParams[n].pTypeRef, 0 );
                        }
                        // cleanup uno return value
                        uno_type_destructData( uno_ret, return_type, 0 );
                        throw;
                    }
                }
                //cleanup args
                if (typelib_TypeClass_DOUBLE < type->eTypeClass &&
                    typelib_TypeClass_ENUM != type->eTypeClass) // opt
                {
                    uno_type_destructData(uno_args[nPos], type, 0);
                }
            }

            if ((0 != return_type) &&
                (typelib_TypeClass_VOID != return_type->eTypeClass))
            {
                // convert uno return value
                try
                {
                    System::Object^ cli_ret;
                     map_to_cli(
                         &cli_ret, uno_ret, return_type, nullptr, false);
                     uno_type_destructData(uno_ret, return_type, 0);
                    return cli_ret;
                }
                catch (...)
                {
                    uno_type_destructData(uno_ret, return_type, 0);
                    throw;
                }
            }
            return nullptr; // void return
        }
        else // exception occurred
        {
            // destruct uno in args
            for ( sal_Int32 nPos = 0; nPos < nParams; ++nPos )
            {
                typelib_MethodParameter const & param = pParams[ nPos ];
                if (param.bIn)
                {
                    uno_type_destructData( uno_args[ nPos ], param.pTypeRef, 0 );
                }
            }
            map_to_cli(ppExc, uno_exc_holder.pData,
                    uno_exc_holder.pType, nullptr, false);
            return nullptr;
        }
    }

    void Bridge::call_cli(
        System::Object^ cliI,
        sr::MethodInfo^ method,
        typelib_TypeDescriptionReference * return_type,
        typelib_MethodParameter * params, int nParams,
        void * uno_ret, void * uno_args [], uno_Any ** uno_exc ) const
    {
        array<System::Object^>^ args=  gcnew array<System::Object^>(nParams);<--- Boolean result is used in bitwise operation. Clarify expression with parentheses.
        for (int nPos= 0; nPos < nParams; nPos++)
        {
            typelib_MethodParameter const & param= params[nPos];
            if (param.bIn)
            {
                pin_ptr<System::Object^> ptr = &args[nPos];
                map_to_cli( ptr,
                    uno_args[nPos], param.pTypeRef, nullptr, false);
            }
        }
        System::Object^ retInvoke= nullptr;
        try
        {
            retInvoke= method->Invoke(cliI, args);
        }
        catch (sr::TargetInvocationException^ e)
        {
            System::Exception^ exc= e->InnerException;
            css::uno::TypeDescription td(mapCliType(exc->GetType()));
            // memory for exception
            std::unique_ptr< rtl_mem > memExc(rtl_mem::allocate(td.get()->nSize));
            map_to_uno(memExc.get(), exc, td.get()->pWeakRef, false);
            (*uno_exc)->pType= td.get()->pWeakRef;
            (*uno_exc)->pData= memExc.release();
            return;
        }
        catch (System::Exception^ e)
        {
            OUStringBuffer buf( 128 );
            buf.append( "Unexpected exception during invocation of cli object. "
                        "Original message is: \n" );
            buf.append(mapCliString(e->Message));
            throw BridgeRuntimeError( buf.makeStringAndClear() );
        }

        //convert out, in/out params
        for (int nPos = 0; nPos < nParams; ++nPos )
        {
            typelib_MethodParameter const & param = params[ nPos ];

            if (param.bOut)
            {
                try
                {
                    map_to_uno(
                        uno_args[ nPos ], args[ nPos ], param.pTypeRef,
                             sal_True == param.bIn /* assign if inout */);
                         // out array
                }
                catch (...)
                {
                    // cleanup uno pure out
                    for ( sal_Int32 n = 0; n < nPos; ++n )
                    {
                        typelib_MethodParameter const & param = params[ n ];
                        if (! param.bIn)
                            uno_type_destructData( uno_args[ n ], param.pTypeRef, 0 );
                    }
                    throw;
                }
            }
        }
        // return value
        if (0 != return_type)
        {
            map_to_uno(
                uno_ret, retInvoke, return_type, false /* no assign */);
        }
        // no exception occurred
        *uno_exc = 0;
    }

    }

    /* vim:set shiftwidth=4 softtabstop=4 expandtab: */