C++ MethodTable::ContainsPointers方法代码示例

HRESULT STDMETHODCALLTYPE ICorDBPrivHelperImpl::CreateManagedObject(
    /*in*/  WCHAR *wszAssemblyName,
    /*in*/  WCHAR *wszModuleName,
    /*in*/  mdTypeDef classToken,
    /*in*/  void *rawData,
    /*out*/ IUnknown **ppUnk)
{
    _ASSERTE(TypeFromToken((mdTypeDef)classToken) == mdtTypeDef);
    _ASSERTE(wszAssemblyName && wszModuleName && ppUnk);

    if (!wszAssemblyName || !wszModuleName || classToken == mdTokenNil) 
        return E_INVALIDARG;

    if (!ppUnk) 
        return E_POINTER;

    HRESULT hr = S_OK;

    BEGINCANNOTTHROWCOMPLUSEXCEPTION();

    // This will set up a managed thread object if one does not already exist
    // for this particular thread.
    Thread* pThread = SetupThread();

    if (pThread == NULL) {
        hr = E_OUTOFMEMORY;
        goto Exit;
    }
    
    // Start up COM Interop
    if (FAILED(hr = QuickCOMStartup()))
        goto Exit;

    {
    // Don't want to be interrupted...
    BOOL fWasGCEnabled = !pThread->PreemptiveGCDisabled();

    if (fWasGCEnabled)
        pThread->DisablePreemptiveGC();
    
    Assembly  *pAssembly;
    Module    *pModule;
     
    if (GetAppDomain() == NULL)
        hr = E_INVALIDARG;
    else
    {
        // Try and load the assembly, given the name provided.
        OBJECTREF pThrowable = NULL;
        GCPROTECT_BEGIN(pThrowable);

        hr = AssemblySpec::LoadAssembly(wszAssemblyName, &pAssembly, &pThrowable);

        GCPROTECT_END();

        if (SUCCEEDED(hr))
        {
            _ASSERTE(pAssembly);

            // Try and load the module, given the name provided.
            hr = pAssembly->GetModuleFromFilename(wszModuleName, &pModule);

            if (SUCCEEDED(hr))
            {
                _ASSERTE(pModule);

                // If the class isn't known,then don't try and create it.
                if (!pModule->GetMDImport()->IsValidToken(classToken))
                    hr = E_INVALIDARG;
                else
                {                    
                    COMPLUS_TRY
                    {
                        OBJECTREF obj = NULL;
                        GCPROTECT_BEGIN(obj);

                        // Now try and get the TypeHandle for the given token
                        NameHandle nameHandle(pModule, classToken);
                        TypeHandle typeHandle =
                            pAssembly->LoadTypeHandle(&nameHandle, &obj);

                        // If an exception was thrown at some point, convert
                        // it to an HRESULT
                        if (obj != NULL)
                            hr = SecurityHelper::MapToHR(obj);

                        // No longer need the object, can be GC'd if desired
                        obj = NULL;

                        if (SUCCEEDED(hr))
                        {
                            _ASSERTE(typeHandle.AsMethodTable());
                            MethodTable *pMT = typeHandle.AsMethodTable();
        
                            if (!pMT->GetClass()->IsValueClass() ||
                                pMT->ContainsPointers())
                                hr = CORDBG_E_OBJECT_IS_NOT_COPYABLE_VALUE_CLASS;

                            if (SUCCEEDED(hr))
                            {
//.........这里部分代码省略.........

HRESULT STDMETHODCALLTYPE ICorDBPrivHelperImpl::GetManagedObjectContents(
        /* in */ IUnknown *pObject,
        /* in */ void *rawData,
        /* in */ ULONG32 dataSize)
{
    if (!pObject || !rawData)
        return E_POINTER;

    if (dataSize == 0)
        return E_INVALIDARG;

    HRESULT hr = S_OK;

    BEGINCANNOTTHROWCOMPLUSEXCEPTION();

    // This will set up a managed thread object if one does not already exist
    // for this particular thread.
    Thread* pThread = SetupThread();

    if (pThread == NULL) {
        hr = E_OUTOFMEMORY;
        goto Exit;
    }
    
    {
    // Don't want to be interrupted...
    BOOL fWasGCEnabled = !pThread->PreemptiveGCDisabled();

    if (fWasGCEnabled)
        pThread->DisablePreemptiveGC();
    
    OBJECTREF obj = NULL;
    GCPROTECT_BEGIN(obj);

    COMPLUS_TRY
    {
        // Get the Object out of the IUnknown.
        obj = GetObjectRefFromComIP(pObject);
        
        MethodTable *pMT = obj->GetMethodTable();
    
        if (!pMT->GetClass()->IsValueClass() ||
            pMT->ContainsPointers() ||
            (pMT->GetClass()->GetNumInstanceFieldBytes() != dataSize))
            hr = CORDBG_E_OBJECT_IS_NOT_COPYABLE_VALUE_CLASS;

        // This is the nasty part. We're gonna copy the raw data out
        // of the object and pass it out.
        if (SUCCEEDED(hr))
        {
            memcpy(rawData, obj->UnBox(), dataSize);
        }
    }
    COMPLUS_CATCH
    {
        // If there's an exception, convert it to an HR
        hr = SecurityHelper::MapToHR(GETTHROWABLE());
    }
    COMPLUS_END_CATCH

    obj = NULL;
    GCPROTECT_END();  // obj
    
    if (fWasGCEnabled)
        pThread->EnablePreemptiveGC();

    }
Exit:
    ENDCANNOTTHROWCOMPLUSEXCEPTION();
    return (hr);
}