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GCArrayletObjectModel_V2.java
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GCArrayletObjectModel_V2.java
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/*******************************************************************************
* Copyright (c) 1991, 2020 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
*******************************************************************************/
package com.ibm.j9ddr.vm29.j9.gc;
import com.ibm.j9ddr.CorruptDataException;
import com.ibm.j9ddr.vm29.pointer.generated.J9IndexableObjectPointer;
import com.ibm.j9ddr.vm29.types.UDATA;
class GCArrayletObjectModel_V2 extends GCArrayletObjectModelBase
{
public GCArrayletObjectModel_V2() throws CorruptDataException
{
}
@Override
public UDATA getSizeInBytesWithHeader(J9IndexableObjectPointer array) throws CorruptDataException
{
return super.getSpineSize(array);
}
/**
* Return the total number of arraylets for an indexable object with a size of dataInSizeByte, including a (possibly empty) leaf in the spine.
* @param dataSizeInBytes size of an array in bytes (not elements)
* @return the number of arraylets used for an array of dataSizeInBytes bytes
*/
@Override
protected UDATA numArraylets(UDATA dataSizeInBytes) throws CorruptDataException
{
UDATA numberOfArraylets = new UDATA(1);
if (!UDATA.MAX.eq(arrayletLeafSize)) {
/* CMVC 135307 : following logic for calculating the leaf count would not overflow dataSizeInBytes.
* the assumption is leaf size is order of 2. It's identical to:
* if (dataSizeInBytes % leafSize) is 0
* leaf count = dataSizeInBytes >> leafLogSize
* else
* leaf count = (dataSizeInBytes >> leafLogSize) + 1
*/
numberOfArraylets = dataSizeInBytes.rightShift(arrayletLeafLogSize).add(dataSizeInBytes.bitAnd(arrayletLeafSizeMask).add(arrayletLeafSizeMask).rightShift(arrayletLeafLogSize));
}
return numberOfArraylets;
}
@Override
public UDATA getTotalFootprintInBytesWithHeader(J9IndexableObjectPointer arrayPtr) throws CorruptDataException {
UDATA spineSize = getSizeInBytesWithHeader(arrayPtr);
UDATA externalArrayletSize = externalArrayletsSize(arrayPtr);
UDATA totalFootprint = spineSize.add(externalArrayletSize);
return totalFootprint;
}
}