001/*
002 * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package jdk.internal.jvmci.code;
024
025import jdk.internal.jvmci.meta.*;
026
027/**
028 * {@link VirtualStackSlot}s are stack slots that are not yet fixed to specific frame offset. They
029 * are replaced by real {@link StackSlot}s with a fixed position in the frame before code emission.
030 */
031public abstract class VirtualStackSlot extends StackSlotValue {
032
033    private final int id;
034
035    public VirtualStackSlot(int id, LIRKind lirKind) {
036        super(lirKind);
037        this.id = id;
038    }
039
040    public int getId() {
041        return id;
042    }
043
044    @Override
045    public String toString() {
046        return "vstack:" + id + getKindSuffix();
047    }
048
049    @Override
050    public int hashCode() {
051        final int prime = 31;
052        int result = super.hashCode();
053        result = prime * result + id;
054        return result;
055    }
056
057    @Override
058    public boolean equals(Object obj) {
059        if (this == obj) {
060            return true;
061        }
062        if (!super.equals(obj)) {
063            return false;
064        }
065        if (getClass() != obj.getClass()) {
066            return false;
067        }
068        VirtualStackSlot other = (VirtualStackSlot) obj;
069        if (id != other.id) {
070            return false;
071        }
072        return true;
073    }
074
075}