1 /*
   2  * Copyright (c) 2014, 2015, 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 org.graalvm.compiler.lir;
  24 
  25 import jdk.vm.ci.code.StackSlot;
  26 import jdk.vm.ci.meta.AllocatableValue;
  27 import jdk.vm.ci.meta.ValueKind;
  28 
  29 /**
  30  * {@link VirtualStackSlot}s are stack slots that are not yet fixed to specific frame offset. They
  31  * are replaced by real {@link StackSlot}s with a fixed position in the frame before code emission.
  32  */
  33 public abstract class VirtualStackSlot extends AllocatableValue {
  34 
  35     private final int id;
  36 
  37     public VirtualStackSlot(int id, ValueKind<?> kind) {
  38         super(kind);
  39         this.id = id;
  40     }
  41 
  42     public int getId() {
  43         return id;
  44     }
  45 
  46     @Override
  47     public String toString() {
  48         return "vstack:" + id + getKindSuffix();
  49     }
  50 
  51     @Override
  52     public int hashCode() {
  53         final int prime = 31;
  54         int result = super.hashCode();
  55         result = prime * result + id;
  56         return result;
  57     }
  58 
  59     @Override
  60     public boolean equals(Object obj) {
  61         if (this == obj) {
  62             return true;
  63         }
  64         if (!super.equals(obj)) {
  65             return false;
  66         }
  67         if (getClass() != obj.getClass()) {
  68             return false;
  69         }
  70         VirtualStackSlot other = (VirtualStackSlot) obj;
  71         if (id != other.id) {
  72             return false;
  73         }
  74         return true;
  75     }
  76 
  77 }