Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotCompressedNullConstant.java @ 23777:6c8eaf47db9a
added -XX:+JVMCIPrintFlags to support printing of JVMCI flags without having to know how to trigger JVMCI initialization
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 04 Oct 2016 22:14:32 +0200 |
parents | 1bbd4a7c274b |
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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 |
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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 } |