/*
 * Copyright (c) 2018, 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.gc.z;

import sun.jvm.hotspot.debugger.Address;

class ZForwardingTableEntry {
    private Address entry;

    ZForwardingTableEntry(Address addr) {
        entry = addr;
    }

    private static long empty() {
        return ~0L;
    }

    boolean is_empty() {
        return entry.asLongValue() == empty();
    }

    Address to_offset() {
        return entry.andWithMask((1L << 42) - 1);
    }

    long from_index() {
        return entry.asLongValue() >>> 42;
    }

    public String toString() {
        return entry + " - from_index: " + from_index() + " to_offset: " + to_offset();
    }
}