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