/*
 * Copyright (c) 2014, 2014, 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 jdk.vm.ci.code;

import jdk.vm.ci.meta.*;

/**
 * {@link VirtualStackSlot}s are stack slots that are not yet fixed to specific frame offset. They
 * are replaced by real {@link StackSlot}s with a fixed position in the frame before code emission.
 */
public abstract class VirtualStackSlot extends StackSlotValue {

    private final int id;

    public VirtualStackSlot(int id, LIRKind lirKind) {
        super(lirKind);
        this.id = id;
    }

    public int getId() {
        return id;
    }

    @Override
    public String toString() {
        return "vstack:" + id + getKindSuffix();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + id;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!super.equals(obj)) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        VirtualStackSlot other = (VirtualStackSlot) obj;
        if (id != other.id) {
            return false;
        }
        return true;
    }

}