ScavengerBackOutScanner.hpp

/*******************************************************************************
 * Copyright IBM Corp. and others 2015
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution
 * and is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception [1] and GNU General Public
 * License, version 2 with the OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] https://openjdk.org/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
 *******************************************************************************/

#ifndef SCAVENGERBACKOUTSCANNER_HPP_
#define SCAVENGERBACKOUTSCANNER_HPP_

#include "omr.h"
#include "omrcfg.h"
#include "omrExampleVM.hpp"
#include "omrhashtable.h"

#include "Base.hpp"
#include "EnvironmentStandard.hpp"
#include "Scavenger.hpp"

#if defined(OMR_GC_MODRON_SCAVENGER)

class MM_ScavengerBackOutScanner : public MM_Base
{
	/*
	 * Member data and types
	 */
private:
	MM_Scavenger *_scavenger;

protected:
public:

	/*
	 * Member functions
	 */
private:
protected:
public:
	MM_ScavengerBackOutScanner(MM_EnvironmentBase *env, bool singleThread, MM_Scavenger *scavenger)
		: MM_Base()
		, _scavenger(scavenger)
	{
	};

	void
	scanAllSlots(MM_EnvironmentBase *env)
	{
		J9HashTableState state;
		OMR_VM_Example *omrVM = (OMR_VM_Example *)env->getOmrVM()->_language_vm;
		RootEntry *rootEntry = (RootEntry *)hashTableStartDo(omrVM->rootTable, &state);
		while (rootEntry != NULL) {
			_scavenger->backOutFixSlotWithoutCompression((volatile omrobjectptr_t *) &rootEntry->rootPtr);
			rootEntry = (RootEntry *)hashTableNextDo(&state);
		}
		ObjectEntry *objectEntry = (ObjectEntry *)hashTableStartDo(omrVM->objectTable, &state);
		while (NULL != objectEntry) {
			if (NULL != objectEntry->objPtr) {
				_scavenger->backOutFixSlotWithoutCompression((volatile omrobjectptr_t *) &objectEntry->objPtr);
			}
			objectEntry = (ObjectEntry *)hashTableNextDo(&state);
		}
		OMR_VMThread *walkThread;
		GC_OMRVMThreadListIterator threadListIterator(env->getOmrVM());
		while((walkThread = threadListIterator.nextOMRVMThread()) != NULL) {
			if (NULL != walkThread->_savedObject1) {
				_scavenger->backOutFixSlotWithoutCompression((volatile omrobjectptr_t *) &walkThread->_savedObject1);
			}
			if (NULL != walkThread->_savedObject2) {
				_scavenger->backOutFixSlotWithoutCompression((volatile omrobjectptr_t *) &walkThread->_savedObject2);
			}
		}
	}
};

#endif /* defined(OMR_GC_MODRON_SCAVENGER) */
#endif /* SCAVENGERBACKOUTSCANNER_HPP_ */