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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/openj9
 Path: blob/master/runtime/gc_structs/ClassFCCSlotIterator.hpp
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/*******************************************************************************

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 * Copyright (c) 1991, 2021 IBM Corp. and others

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 *

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 * This program and the accompanying materials are made available under

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 * the terms of the Eclipse Public License 2.0 which accompanies this

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 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/

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 * or the Apache License, Version 2.0 which accompanies this distribution and

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 * is available at https://www.apache.org/licenses/LICENSE-2.0.

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 *

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 * This Source Code may also be made available under the following

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 * Secondary Licenses when the conditions for such availability set

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 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU

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 * General Public License, version 2 with the GNU Classpath

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 * Exception [1] and GNU General Public License, version 2 with the

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 * OpenJDK Assembly Exception [2].

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 *

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 * [1] https://www.gnu.org/software/classpath/license.html

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 * [2] http://openjdk.java.net/legal/assembly-exception.html

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 *

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 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception

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 *******************************************************************************/

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/**

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 * @file

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 * @ingroup GC_Structs

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 */

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#if !defined(CLASSFCCSLOTITERATOR_HPP_)

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#define CLASSFCCSLOTITERATOR_HPP_

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#include "j9.h"

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#include "j9nonbuilder.h"

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/**

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 * Iterate through slots in the flattened class cache which may contain a

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 *  class reference.

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 *

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 * @see GC_ClassFCCSLotIterator

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 * @ingroup GC_Structs

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 */

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class GC_ClassFCCSlotIterator

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{

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private:

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    J9Class* _clazz;

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    UDATA _numberOfFlattenedFields;

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    UDATA _index;

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public:

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	GC_ClassFCCSlotIterator(J9Class *clazz) :

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        _clazz(clazz),

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        _numberOfFlattenedFields(0),

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        _index(0)

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	{

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        if (J9_ARE_NO_BITS_SET(J9CLASS_FLAGS(clazz), J9AccClassArray) && (NULL != clazz->flattenedClassCache))  {

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            _numberOfFlattenedFields = clazz->flattenedClassCache->numberOfEntries;

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        }

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    };

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	J9Class *nextSlot();

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	/**

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	 * Gets the current slot's index in the FCC.

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	 * @return index of current slot index in the flattened class cache

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	 */

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	MMINLINE IDATA getIndex() {

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        return _index;

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    }

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};

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#endif /* CLASSFCCSLOTITERATOR_HPP_ */

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