1 /* 2 * Copyright (c) 2009, 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 jdk.vm.ci.code; 24 25 import jdk.vm.ci.meta.*; 26 27 /** 28 * Denotes a register that stores a value of a fixed kind. There is exactly one (canonical) instance 29 * of {@link RegisterValue} for each ({@link Register}, {@link JavaKind}) pair. Use 30 * {@link Register#asValue(LIRKind)} to retrieve the canonical {@link RegisterValue} instance for a 31 * given (register,kind) pair. 32 */ 33 public final class RegisterValue extends AllocatableValue { 34 35 private final Register reg; 36 37 /** 38 * Should only be called from {@link Register#Register} to ensure canonicalization. 39 */ 40 protected RegisterValue(LIRKind kind, Register register) { 41 super(kind); 42 this.reg = register; 43 } 44 45 @Override 46 public String toString() { 47 return getRegister().name + getKindSuffix(); 48 } 49 50 /** 51 * @return the register that contains the value 52 */ 53 public Register getRegister() { 54 return reg; 55 } 56 57 @Override 58 public int hashCode() { 59 return 29 * super.hashCode() + reg.hashCode(); 60 } 61 62 @Override 63 public boolean equals(Object obj) { 64 if (obj instanceof RegisterValue) { 65 RegisterValue other = (RegisterValue) obj; 66 return super.equals(obj) && reg.equals(other.reg); 67 } 68 return false; 69 } 70 }