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Array.java
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Array.java
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/*
* Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
package sun.jvm.hotspot.oops;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.memory.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.Observable;
import sun.jvm.hotspot.utilities.Observer;
// Array is an abstract superclass for TypeArray and ObjArray
public class Array extends Oop {
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
Array(OopHandle handle, ObjectHeap heap) {
super(handle, heap);
}
private static void initialize(TypeDataBase db) throws WrongTypeException {
Type type = db.lookupType("arrayOopDesc");
typeSize = (int)type.getSize();
}
// Size of the arrayOopDesc
private static long headerSize=0;
private static long lengthOffsetInBytes=0;
private static long typeSize;
private static long headerSizeInBytes() {
if (headerSize != 0) {
return headerSize;
}
headerSize = lengthOffsetInBytes() + VM.getVM().getIntSize();
return headerSize;
}
private static long lengthOffsetInBytes() {
if (lengthOffsetInBytes != 0) {
return lengthOffsetInBytes;
}
lengthOffsetInBytes = typeSize;
return lengthOffsetInBytes;
}
// Accessors for declared fields
public long getLength() {
boolean isUnsigned = true;
return this.getHandle().getCIntegerAt(lengthOffsetInBytes(), VM.getVM().getIntSize(), isUnsigned);
}
public long getObjectSize() {
ArrayKlass klass = (ArrayKlass) getKlass();
// We have to fetch the length of the array, shift (multiply) it
// appropriately, up to wordSize, add the header, and align to
// object size.
long s = getLength() << klass.getLog2ElementSize();
s += klass.getArrayHeaderInBytes();
s = Oop.alignObjectSize(s);
return s;
}
public static long baseOffsetInBytes(BasicType type) {
long typeSizeInBytes = headerSizeInBytes();
if (Universe.elementTypeShouldBeAligned(type)) {
VM vm = VM.getVM();
return vm.alignUp(typeSizeInBytes, vm.getVM().getHeapWordSize());
} else {
return typeSizeInBytes;
}
}
public boolean isArray() { return true; }
public void iterateFields(OopVisitor visitor, boolean doVMFields) {
super.iterateFields(visitor, doVMFields);
}
}