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annotate jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/RegisterArray.java @ 24125:0c5404418ec2

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Backout getMarkName fix
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Tue, 11 Apr 2017 08:59:43 -0700
parents 9e1235406b59
children
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1 /*
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2 * Copyright (c) 2009, 2016, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package jdk.vm.ci.code;
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24
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25 import java.util.Arrays;
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26 import java.util.Collection;
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27 import java.util.Collections;
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28 import java.util.Iterator;
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29 import java.util.List;
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30
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31 /**
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32 * An immutable ordered list of registers. Only required because Java lacks immutable arrays.
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33 */
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34 public final class RegisterArray implements Iterable<Register> {
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35
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36 private final Register[] registers;
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37 private int hash;
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38
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39 public RegisterArray(Register... registers) {
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40 this.registers = registers;
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41 }
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42
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43 public RegisterArray(Collection<Register> registers) {
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44 this.registers = registers.toArray(new Register[registers.size()]);
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45 }
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46
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47 /**
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48 * Gets the number of registers.
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49 */
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50 public int size() {
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51 return registers.length;
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52 }
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53
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54 /**
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55 * Gets the register at a given index.
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56 *
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57 * @param index the index of the register to retrieve
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58 */
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59 public Register get(int index) {
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60 return registers[index];
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61 }
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62
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63 public void addTo(Collection<Register> collection) {
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64 collection.addAll(Arrays.asList(registers));
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65 }
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66
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67 /**
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68 * Gets an immutable view of the registers as a list.
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69 */
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70 public List<Register> asList() {
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71 return Collections.unmodifiableList(Arrays.asList(registers));
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72 }
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73
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74 /**
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75 * Gets a copy of the registers as an array.
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76 */
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77 public Register[] toArray() {
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78 return registers.clone();
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79 }
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80
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81 public Iterator<Register> iterator() {
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82 return Arrays.asList(registers).iterator();
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83 }
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84
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85 @Override
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86 public int hashCode() {
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87 if (hash == 0 && registers.length > 0) {
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88 hash = Arrays.hashCode(registers);
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89 }
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90 return hash;
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91 }
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92
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93 @Override
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94 public boolean equals(Object obj) {
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95 if (obj instanceof RegisterArray) {
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96 return Arrays.equals(registers, ((RegisterArray) obj).registers);
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97 }
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98 return false;
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99 }
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100
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101 @Override
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102 public String toString() {
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103 return Arrays.toString(registers);
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104 }
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105 }