Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/Value.java @ 24226:abc19eb35547
allow java.vm.name and java.vm.version to be initialized from a vm.properties file next to libjvm
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 24 Aug 2017 22:20:40 +0200 |
parents | 282873d0192c |
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rev | line source |
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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.meta; |
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24 |
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25 /** |
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26 * Abstract base class for values. |
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27 */ |
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28 public abstract class Value { |
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29 |
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30 public static final Value[] NO_VALUES = new Value[0]; |
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31 |
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32 public static final AllocatableValue ILLEGAL = new IllegalValue(); |
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33 |
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34 private static final class IllegalValue extends AllocatableValue { |
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35 private IllegalValue() { |
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36 super(ValueKind.Illegal); |
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37 } |
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38 |
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39 @Override |
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40 public String toString() { |
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41 return "-"; |
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42 } |
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43 |
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44 @Override |
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45 public boolean equals(Object other) { |
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46 // Due to de-serialization this object may exist multiple times. So we compare classes |
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47 // instead of the individual objects. (This anonymous class has always the same meaning) |
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48 return other instanceof IllegalValue; |
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49 } |
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50 } |
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51 |
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52 private final ValueKind<?> valueKind; |
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53 |
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54 /** |
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55 * Initializes a new value of the specified kind. |
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56 * |
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57 * @param valueKind the kind |
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58 */ |
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59 protected Value(ValueKind<?> valueKind) { |
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60 this.valueKind = valueKind; |
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61 } |
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62 |
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63 /** |
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64 * Returns a String representation of the kind, which should be the end of all |
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65 * {@link #toString()} implementation of subclasses. |
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66 */ |
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67 protected final String getKindSuffix() { |
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68 return "|" + valueKind.getKindSuffix(); |
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69 } |
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70 |
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71 public final ValueKind<?> getValueKind() { |
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72 return valueKind; |
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73 } |
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74 |
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75 public final <K extends ValueKind<K>> K getValueKind(Class<K> cls) { |
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76 return cls.cast(valueKind); |
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77 } |
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78 |
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79 /** |
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80 * Returns the platform specific kind used to store this value. |
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81 */ |
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82 public final PlatformKind getPlatformKind() { |
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83 return valueKind.getPlatformKind(); |
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84 } |
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85 |
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86 @Override |
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87 public int hashCode() { |
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88 return 41 + valueKind.hashCode(); |
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89 } |
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90 |
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91 @Override |
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92 public boolean equals(Object obj) { |
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93 if (obj instanceof Value) { |
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94 Value that = (Value) obj; |
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95 return valueKind.equals(that.valueKind); |
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96 } |
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97 return false; |
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98 } |
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99 |
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100 /** |
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101 * Checks if this value is identical to {@code other}. |
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102 * |
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103 * Warning: Use with caution! Usually equivalence {@link #equals(Object)} is sufficient and |
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104 * should be used. |
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105 */ |
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106 public final boolean identityEquals(Value other) { |
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107 return this == other; |
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108 } |
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109 } |