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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotCompressedNullConstant.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents 1bbd4a7c274b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2014, 2015, 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
e43591136d9f Support for compressed constants.
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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.hotspot;
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24
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25 import jdk.vm.ci.meta.Constant;
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26 import jdk.vm.ci.meta.JavaConstant;
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27 import jdk.vm.ci.meta.JavaKind;
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28
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29 /**
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30 * The compressed representation of the {@link JavaConstant#NULL_POINTER null constant}.
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31 */
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32 public final class HotSpotCompressedNullConstant implements JavaConstant, HotSpotConstant {
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33
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34 public static final JavaConstant COMPRESSED_NULL = new HotSpotCompressedNullConstant();
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35
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36 private HotSpotCompressedNullConstant() {
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37 }
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38
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39 public JavaKind getJavaKind() {
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40 return JavaKind.Object;
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41 }
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42
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43 @Override
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44 public boolean isNull() {
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45 return true;
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46 }
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47
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48 @Override
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49 public boolean isCompressed() {
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50 return true;
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51 }
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52
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53 public Constant compress() {
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54 throw new IllegalArgumentException();
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55 }
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56
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57 public Constant uncompress() {
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58 return NULL_POINTER;
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59 }
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60
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61 @Override
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62 public boolean isDefaultForKind() {
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63 return true;
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64 }
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65
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66 @Override
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67 public Object asBoxedPrimitive() {
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68 throw new IllegalArgumentException();
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69 }
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70
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71 @Override
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72 public int asInt() {
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73 throw new IllegalArgumentException();
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74 }
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75
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76 @Override
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77 public boolean asBoolean() {
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78 throw new IllegalArgumentException();
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79 }
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80
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81 @Override
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82 public long asLong() {
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83 throw new IllegalArgumentException();
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84 }
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85
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86 @Override
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87 public float asFloat() {
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88 throw new IllegalArgumentException();
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89 }
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90
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91 @Override
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92 public double asDouble() {
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93 throw new IllegalArgumentException();
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94 }
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95
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96 @Override
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97 public String toString() {
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98 return JavaConstant.toString(this);
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99 }
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100
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101 @Override
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102 public String toValueString() {
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103 return "null";
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104 }
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105
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106 @Override
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107 public int hashCode() {
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108 return System.identityHashCode(this);
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109 }
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110
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111 @Override
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112 public boolean equals(Object o) {
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113 return o instanceof HotSpotCompressedNullConstant;
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114 }
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115 }