1 /*

     2  * Copyright (c) 2014, 2014, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 package jdk.vm.ci.code;

    24 

    25 import jdk.vm.ci.meta.*;

    26 

    27 /**

    28  * {@link VirtualStackSlot}s are stack slots that are not yet fixed to specific frame offset. They

    29  * are replaced by real {@link StackSlot}s with a fixed position in the frame before code emission.

    30  */

    31 public abstract class VirtualStackSlot extends StackSlotValue {

    32 

    33     private final int id;

    34 

    35     public VirtualStackSlot(int id, LIRKind lirKind) {

    36         super(lirKind);

    37         this.id = id;

    38     }

    39 

    40     public int getId() {

    41         return id;

    42     }

    43 

    44     @Override

    45     public String toString() {

    46         return "vstack:" + id + getKindSuffix();

    47     }

    48 

    49     @Override

    50     public int hashCode() {

    51         final int prime = 31;

    52         int result = super.hashCode();

    53         result = prime * result + id;

    54         return result;

    55     }

    56 

    57     @Override

    58     public boolean equals(Object obj) {

    59         if (this == obj) {

    60             return true;

    61         }

    62         if (!super.equals(obj)) {

    63             return false;

    64         }

    65         if (getClass() != obj.getClass()) {

    66             return false;

    67         }

    68         VirtualStackSlot other = (VirtualStackSlot) obj;

    69         if (id != other.id) {

    70             return false;

    71         }

    72         return true;

    73     }

    74 

    75 }