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.AllocatableValue; 26 import jdk.vm.ci.meta.JavaKind; 27 import jdk.vm.ci.meta.LIRKind; 28 29 /** 30 * Denotes a register that stores a value of a fixed kind. There is exactly one (canonical) instance 31 * of {@link RegisterValue} for each ({@link Register}, {@link JavaKind}) pair. Use 32 * {@link Register#asValue(LIRKind)} to retrieve the canonical {@link RegisterValue} instance for a 33 * given (register,kind) pair. 34 */ 35 public final class RegisterValue extends AllocatableValue { 36 37 private final Register reg; 38 39 /** 40 * Should only be called from {@link Register#Register} to ensure canonicalization. 41 */ 42 protected RegisterValue(LIRKind kind, Register register) { 43 super(kind); 44 this.reg = register; 45 } 46 47 @Override 48 public String toString() { 49 return getRegister().name + getKindSuffix(); 50 } 51 52 /** 53 * @return the register that contains the value 54 */ 55 public Register getRegister() { 56 return reg; 57 } 58 59 @Override 60 public int hashCode() { 61 return 29 * super.hashCode() + reg.hashCode(); 62 } 63 64 @Override 65 public boolean equals(Object obj) { 66 if (obj instanceof RegisterValue) { 67 RegisterValue other = (RegisterValue) obj; 68 return super.equals(obj) && reg.equals(other.reg); 69 } 70 return false; 71 } 72 }