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annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/NullConstant.java @ 18885:0e9ae9a7e675

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made some hash codes stable across VM executions to support replay compilation
author Doug Simon <doug.simon@oracle.com>
date Tue, 20 Jan 2015 16:53:28 +0100
parents ca81508f2a19
children 082417ac43e4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * Copyright (c) 2014, 2014, 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 com.oracle.graal.api.meta;
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24
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25 /**
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26 * The implementation type of the {@link JavaConstant#NULL_POINTER null constant}.
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27 */
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28 final class NullConstant extends AbstractValue implements JavaConstant {
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29
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30 private static final long serialVersionUID = 8906209595800783961L;
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31
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32 protected NullConstant() {
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33 super(LIRKind.reference(Kind.Object));
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34 }
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35
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36 @Override
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37 public boolean isNull() {
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38 return true;
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39 }
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40
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41 @Override
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42 public boolean isDefaultForKind() {
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43 return true;
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44 }
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45
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46 @Override
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47 public Object asBoxedPrimitive() {
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48 throw new IllegalArgumentException();
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49 }
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50
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51 @Override
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52 public int asInt() {
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53 throw new IllegalArgumentException();
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54 }
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55
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56 @Override
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57 public boolean asBoolean() {
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58 throw new IllegalArgumentException();
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59 }
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60
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61 @Override
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62 public long asLong() {
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63 throw new IllegalArgumentException();
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64 }
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65
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66 @Override
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67 public float asFloat() {
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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 double asDouble() {
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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 String toString() {
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78 return JavaConstant.toString(this);
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79 }
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80
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81 @Override
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82 public String toValueString() {
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83 return "null";
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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 13;
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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 o) {
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93 return o instanceof NullConstant;
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94 }
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95 }