RegisterArray.java revision 12657:6ef01bd40ce2
122347Spst/* 222347Spst * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 329964Sache * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 492906Smarkm * 522347Spst * This code is free software; you can redistribute it and/or modify it 622347Spst * under the terms of the GNU General Public License version 2 only, as 722347Spst * published by the Free Software Foundation. 822347Spst * 922347Spst * This code is distributed in the hope that it will be useful, but WITHOUT 1022347Spst * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1122347Spst * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1222347Spst * version 2 for more details (a copy is included in the LICENSE file that 1322347Spst * accompanied this code). 1422347Spst * 1522347Spst * You should have received a copy of the GNU General Public License version 1622347Spst * 2 along with this work; if not, write to the Free Software Foundation, 1722347Spst * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1822347Spst * 1922347Spst * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2022347Spst * or visit www.oracle.com if you need additional information or have any 2122347Spst * questions. 2222347Spst */ 2322347Spstpackage jdk.vm.ci.code; 2422347Spst 2522347Spstimport java.util.Arrays; 2622347Spstimport java.util.Collection; 2722347Spstimport java.util.Collections; 2822347Spstimport java.util.Iterator; 2922347Spstimport java.util.List; 3022347Spst 3122347Spst/** 3222347Spst * An immutable ordered list of registers. Only required because Java lacks immutable arrays. 3322347Spst */ 3422347Spstpublic final class RegisterArray implements Iterable<Register> { 3522347Spst 3622347Spst private final Register[] registers; 3722347Spst private int hash; 3822347Spst 3922347Spst public RegisterArray(Register... registers) { 4022347Spst this.registers = registers; 4122347Spst } 4222347Spst 4322347Spst public RegisterArray(Collection<Register> registers) { 4422347Spst this.registers = registers.toArray(new Register[registers.size()]); 4522347Spst } 4622347Spst 4722347Spst /** 4822347Spst * Gets the number of registers. 4922347Spst */ 5022347Spst public int size() { 5122347Spst return registers.length; 5222347Spst } 5322347Spst 5422347Spst /** 5522347Spst * Gets the register at a given index. 5622347Spst * 5722347Spst * @param index the index of the register to retrieve 5822347Spst */ 5922347Spst public Register get(int index) { 6022347Spst return registers[index]; 6122347Spst } 6222347Spst 6322347Spst public void addTo(Collection<Register> collection) { 6422347Spst collection.addAll(Arrays.asList(registers)); 6522347Spst } 6622347Spst 6722347Spst /** 6822347Spst * Gets an immutable view of the registers as a list. 6922347Spst */ 7022347Spst public List<Register> asList() { 7122347Spst return Collections.unmodifiableList(Arrays.asList(registers)); 7222347Spst } 7322347Spst 7422347Spst /** 7522347Spst * Gets a copy of the registers as an array. 7622347Spst */ 7722347Spst public Register[] toArray() { 7822347Spst return registers.clone(); 7922347Spst } 8022347Spst 8122347Spst public Iterator<Register> iterator() { 8222347Spst return Arrays.asList(registers).iterator(); 83 } 84 85 @Override 86 public int hashCode() { 87 if (hash == 0 && registers.length > 0) { 88 hash = Arrays.hashCode(registers); 89 } 90 return hash; 91 } 92 93 @Override 94 public boolean equals(Object obj) { 95 if (obj instanceof RegisterArray) { 96 return Arrays.equals(registers, ((RegisterArray) obj).registers); 97 } 98 return false; 99 } 100 101 @Override 102 public String toString() { 103 return Arrays.toString(registers); 104 } 105} 106