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StandardWriteBarrier.hpp
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StandardWriteBarrier.hpp
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/*******************************************************************************
* Copyright (c) 2017, 2017 IBM Corp. and others
*
* 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] http://openjdk.java.net/legal/assembly-exception.html
*
* 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
*******************************************************************************/
#ifndef STANDARDWRITEBARRIER_HPP_
#define STANDARDWRITEBARRIER_HPP_
#include "objectdescription.h"
#include "CardTable.hpp"
#include "Configuration.hpp"
#include "EnvironmentStandard.hpp"
#include "GCExtensionsBase.hpp"
#include "ObjectModel.hpp"
#include "Scavenger.hpp"
#include "SlotObject.hpp"
struct OMR_VMThread;
/**
* Out-of-line write barrier. In the absence of other (equivalent inline) write barrier, this method must
* be called whenever a child reference is assigned to a parent slot.
*
* To support OMR concurrent marking and/or generational collectors, this method calls the necessary
* concurrent and generational write barriers.
*
* @param omrThread The thread making the assignment of child reference into parent slot
* @param parentObject the parent object
* @param childObject THe child object reference
*/
MMINLINE void
standardWriteBarrier(OMR_VMThread *omrThread, omrobjectptr_t parentObject, omrobjectptr_t childObject)
{
#if defined(OMR_GC_MODRON_SCAVENGER) || defined(OMR_GC_MODRON_CONCURRENT_MARK)
MM_EnvironmentBase *env = MM_EnvironmentBase::getEnvironment(omrThread);
MM_GCExtensionsBase *extensions = env->getExtensions();
#if defined(OMR_GC_MODRON_SCAVENGER)
if (extensions->scavengerEnabled) {
if (extensions->isOld(parentObject) && !extensions->isOld(childObject)) {
if (extensions->objectModel.atomicSetRememberedState(parentObject, STATE_REMEMBERED)) {
/* The object has been successfully marked as REMEMBERED - allocate an entry in the remembered set */
extensions->scavenger->addToRememberedSetFragment((MM_EnvironmentStandard *)env, parentObject);
}
}
}
#endif /* defined(OMR_GC_MODRON_SCAVENGER) */
#if defined(OMR_GC_MODRON_CONCURRENT_MARK)
if ((extensions->concurrentMark) && (extensions->configuration->isIncrementalUpdateBarrierEnabled())) {
extensions->cardTable->dirtyCard(env, parentObject);
}
#endif /* defined(OMR_GC_MODRON_CONCURRENT_MARK) */
#endif /* defined(OMR_GC_MODRON_SCAVENGER) || defined(OMR_GC_MODRON_CONCURRENT_MARK) */
}
/**
* Convenience method to effect the assignment of a child reference to a parent slot and call
* out-of-line write barrier.
*
* @param omrThread The thread making the assignment of child reference to parent slot
* @param parentObject the parent object
* @param parentSlot Points to the slot in the parent object that will receive the child reference
* @param childObject THe child object reference
* @see standardWriteBarrier(OMR_VMThread *, omrobjectptr_t, omrobjectptr_t)
*/
MMINLINE void
standardWriteBarrierStore(OMR_VMThread *omrThread, omrobjectptr_t parentObject, fomrobject_t *parentSlot, omrobjectptr_t childObject)
{
GC_SlotObject slotObject(omrThread->_vm, parentSlot);
slotObject.writeReferenceToSlot(childObject);
standardWriteBarrier(omrThread, parentObject, childObject);
}
#endif /* STANDARDWRITEBARRIER_HPP_ */