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ObjectHeapBufferedIterator.cpp
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ObjectHeapBufferedIterator.cpp
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/*******************************************************************************
* Copyright (c) 1991, 2021 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
*******************************************************************************/
#include "ModronAssertions.h"
#include "GCExtensionsBase.hpp"
#include "HeapRegionDescriptor.hpp"
#include "ObjectHeapBufferedIterator.hpp"
GC_ObjectHeapBufferedIterator::GC_ObjectHeapBufferedIterator(MM_GCExtensionsBase *extensions, MM_HeapRegionDescriptor *region, bool includeDeadObjects, uintptr_t maxElementsToCache)
{
init(extensions, region, region->getLowAddress(), region->getHighAddress(), includeDeadObjects, maxElementsToCache);
}
GC_ObjectHeapBufferedIterator::GC_ObjectHeapBufferedIterator(MM_GCExtensionsBase *extensions, MM_HeapRegionDescriptor *region, void *base, void *top, bool includeDeadObjects, uintptr_t maxElementsToCache)
{
init(extensions, region, base, top, includeDeadObjects, maxElementsToCache);
}
void
GC_ObjectHeapBufferedIterator::init(MM_GCExtensionsBase* extensions, MM_HeapRegionDescriptor* region, void *base, void *top, bool includeDeadObjects, uintptr_t maxElementsToCache)
{
_region = region;
_cacheIndex = 0;
_cacheSizeToUse = OMR_MIN(maxElementsToCache, CACHE_SIZE);
_populator = getPopulator();
_state.extensions = extensions;
_state.includeDeadObjects = includeDeadObjects;
_populator->initializeObjectHeapBufferedIteratorState(region, &_state);
_cacheCount = _populator->populateObjectHeapBufferedIteratorCache(_cache, _cacheSizeToUse, &_state);
}
void
GC_ObjectHeapBufferedIterator::reset(uintptr_t *base, uintptr_t *top)
{
_populator->reset(_region, &_state, base, top);
_cacheIndex = 0;
_cacheCount = _populator->populateObjectHeapBufferedIteratorCache(_cache, _cacheSizeToUse, &_state);
}
omrobjectptr_t
GC_ObjectHeapBufferedIterator::nextObject()
{
if (_cacheCount == 0) {
return NULL;
}
if (_cacheIndex == _cacheCount) {
_cacheIndex = 0;
_cacheCount = _populator->populateObjectHeapBufferedIteratorCache(_cache, _cacheSizeToUse, &_state);
if (_cacheCount == 0) {
return NULL;
}
}
omrobjectptr_t next = _cache[_cacheIndex];
_cacheIndex++;
return next;
}
const MM_ObjectHeapBufferedIteratorPopulator*
GC_ObjectHeapBufferedIterator::getPopulator()
{
const MM_ObjectHeapBufferedIteratorPopulator *populator = NULL;
switch (_region->getRegionType()) {
case MM_HeapRegionDescriptor::RESERVED:
case MM_HeapRegionDescriptor::FREE:
case MM_HeapRegionDescriptor::ADDRESS_ORDERED_IDLE:
/* (for all intents and purposes, an IDLE region is the same as a FREE region) */
case MM_HeapRegionDescriptor::ARRAYLET_LEAF:
populator = &_emptyListPopulator;
break;
case MM_HeapRegionDescriptor::ADDRESS_ORDERED:
populator = &_addressOrderedListPopulator;
break;
case MM_HeapRegionDescriptor::ADDRESS_ORDERED_MARKED:
populator = &_markedObjectPopulator;
break;
#if defined(OMR_GC_SEGREGATED_HEAP)
case MM_HeapRegionDescriptor::SEGREGATED_SMALL:
case MM_HeapRegionDescriptor::SEGREGATED_LARGE:
populator = &_segregatedListPopulator;
break;
#endif /* OMR_GC_SEGREGATED_HEAP */
default:
Assert_MM_unreachable();
break;
}
return populator;
}
void
GC_ObjectHeapBufferedIterator::advance(uintptr_t sizeInBytes)
{
_cacheIndex = 0;
_populator->advance(sizeInBytes, &_state);
_cacheCount = _populator->populateObjectHeapBufferedIteratorCache(_cache, _cacheSizeToUse, &_state);
}