1 /* 2 * Copyright (c) 2010, 2018, 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 24 25 package org.graalvm.compiler.lir; 26 27 import jdk.vm.ci.code.RegisterValue; 28 import jdk.vm.ci.code.StackSlot; 29 import jdk.vm.ci.meta.AllocatableValue; 30 import jdk.vm.ci.meta.ValueKind; 31 32 /** 33 * Represents a value that is yet to be bound to a machine location (such as a {@link RegisterValue} 34 * or {@link StackSlot}) by a register allocator. 35 */ 36 public class Variable extends AllocatableValue { 37 38 /** 39 * The identifier of the variable. This is a non-zero index in a contiguous 0-based name space. 40 */ 41 public final int index; 42 43 private String name; 44 45 /** 46 * Creates a new variable. 47 * 48 * @param kind 49 * @param index 50 */ 51 public Variable(ValueKind<?> kind, int index) { 52 super(kind); 53 assert index >= 0; 54 this.index = index; 55 } 56 57 public void setName(String name) { 58 this.name = name; 59 } 60 61 public String getName() { 62 return name; 63 } 64 65 @Override 66 public String toString() { 67 if (name != null) { 68 return name; 69 } else { 70 return "v" + index + getKindSuffix(); 71 } 72 } 73 74 @Override 75 public int hashCode() { 76 return 71 * super.hashCode() + index; 77 } 78 79 @Override 80 public boolean equals(Object obj) { 81 if (obj instanceof Variable) { 82 Variable other = (Variable) obj; 83 return super.equals(other) && index == other.index; 84 } 85 return false; 86 } 87 }