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IDebugComPlusSymbolProvider2::LoadSymbolsFromCallback

  • Article

Loads debug symbols using the specified callback method.

Syntax

int LoadSymbolsFromCallback(
    uint   ulAppDomainID,
    Guid   guidModule,
    object pUnkMetadataImport,
    object pUnkCorDebugModule,
    string bstrModuleName,
    string bstrSymSearchPath,
    object pCallback
);

Parameters

ulAppDomainID
[in] Identifier of the application domain.

guidModule
[in] Unique identifier of the module.

pUnkMetadataImport
[in] Object that contains the symbol metadata.

pUnkCorDebugModule
[in] Object that implements the ICorDebugModule Interface.

bstrModuleName
[in] Name of the module.

bstrSymSearchPath
[in] Path to search for the symbol file.

pCallback
[in] Object that represents the callback method.

Return Value

If successful, returns S_OK; otherwise, returns an error code.

Example

The following example shows how to implement this method for a CDebugSymbolProvider object that exposes the IDebugComPlusSymbolProvider2 interface.

HRESULT CDebugSymbolProvider::LoadSymbolsFromCallback(
    ULONG32 ulAppDomainID,
    GUID guidModule,
    IUnknown *pMetadataImport,
    IUnknown * _pCorModule,
    BSTR bstrModule,
    BSTR bstrSearchPath,
    IUnknown *pCallback)
{
    EMIT_TICK_COUNT("Entry -- Loading symbols for the following target:");
    USES_CONVERSION;
    EmitTickCount(W2A(bstrModule));

    CAutoLock Lock(this);

    HRESULT hr = S_OK;
    CComPtr<IMetaDataImport> pMetadata;
    CComPtr<ICorDebugModule> pCorModule;

    CModule* pmodule = NULL;
    CModule* pmoduleNew = NULL;
    bool fAlreadyLoaded = false;
    Module_ID idModule(ulAppDomainID, guidModule);
    bool fSymbolsLoaded = false;
    DWORD dwCurrentState = 0;

    ASSERT(IsValidObjectPtr(this, CDebugSymbolProvider));
    ASSERT(IsValidInterfacePtr(pMetadataImport, IUnknown));

    METHOD_ENTRY( CDebugSymbolProvider::LoadSymbol );

    IfFalseGo( pMetadataImport, E_INVALIDARG );
    IfFalseGo( _pCorModule, E_INVALIDARG );

    IfFailGo( pMetadataImport->QueryInterface( IID_IMetaDataImport,
              (void**)&pMetadata) );

    IfFailGo( _pCorModule->QueryInterface( IID_ICorDebugModule,
                                           (void**)&pCorModule) );

    ASSERT(guidModule != GUID_NULL);

    fAlreadyLoaded = GetModule( idModule, &pmodule ) == S_OK;

    IfNullGo( pmoduleNew = new CModule, E_OUTOFMEMORY );

    //
    // We are now allowing modules to be created that do not have SymReaders.
    // It is likely there are a number of corner cases being ignored
    // that will require knowledge of the hr result below.
    //
    dwCurrentState = m_pSymProvGroup ? m_pSymProvGroup->GetCurrentState() : 0;
    HRESULT hrLoad = pmoduleNew->Create( idModule,
                                         dwCurrentState,
                                         pMetadata,
                                         pCorModule,
                                         bstrModule,
                                         bstrSearchPath,
                                         pCallback );

    if (hrLoad == S_OK)
    {
        fSymbolsLoaded = true;
    }

    // Remove the old module
    if (fAlreadyLoaded)
    {
        IfFailGo(pmoduleNew->AddEquivalentModulesFrom(pmodule));
        RemoveModule( pmodule );
    }

    IfFailGo( AddModule( pmoduleNew ) );

Error:

    RELEASE (pmodule);
    RELEASE (pmoduleNew);

    if (SUCCEEDED(hr) && !fSymbolsLoaded)
    {
        hr = hrLoad;
    }

    METHOD_EXIT( CDebugSymbolProvider::LoadSymbol, hr );
    EMIT_TICK_COUNT("Exit");
    return hr;
}

See also