/*
 * Copyright (c) 2023, 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
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 */

package sun.jvm.hotspot.oops;

import sun.jvm.hotspot.debugger.Address;
import sun.jvm.hotspot.runtime.VM;
import sun.jvm.hotspot.types.Type;
import sun.jvm.hotspot.types.TypeDataBase;
import sun.jvm.hotspot.types.WrongTypeException;
import sun.jvm.hotspot.utilities.GenericArray;
import sun.jvm.hotspot.utilities.Observable;
import sun.jvm.hotspot.utilities.Observer;

public class ResolvedIndyArray extends GenericArray {
    static {
        VM.registerVMInitializedObserver(new Observer() {
            public void update(Observable o, Object data) {
                initialize(VM.getVM().getTypeDataBase());
            }
        });
    }

    private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
        elemType = db.lookupType("ResolvedIndyEntry");

        Type type = db.lookupType("Array<ResolvedIndyEntry>");
        dataFieldOffset = type.getAddressField("_data").getOffset();
    }

    private static long dataFieldOffset;
    protected static Type elemType;

    public ResolvedIndyArray(Address addr) {
        super(addr, dataFieldOffset);
    }

    public ResolvedIndyEntry getAt(int index) {
        if (index < 0 || index >= length()) throw new ArrayIndexOutOfBoundsException(index + " " + length());

        Type elemType = getElemType();

        Address data = getAddress().addOffsetTo(dataFieldOffset);
        long elemSize = elemType.getSize();

        return new ResolvedIndyEntry(data.addOffsetTo(index* elemSize));
    }

    public Type getElemType() {
        return elemType;
    }
}
