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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotCompressedNullConstant.java @ 16116:9e5a323e0a1e

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Remove hotspot specific NarrowOop kind, use LIRKind.reference(Kind.Int) instead.
author Roland Schatz <roland.schatz@oracle.com>
date Tue, 17 Jun 2014 09:59:59 +0200
parents 4dd2cedc7f57
children 9a804ec7f707
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e43591136d9f Support for compressed constants.
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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.hotspot.meta;
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24
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25 import com.oracle.graal.api.meta.*;
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26
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27 /**
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28 * The compressed representation of the {@link Constant#NULL_OBJECT null constant}.
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29 */
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30 public final class HotSpotCompressedNullConstant extends Constant implements HotSpotConstant {
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31
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32 private static final long serialVersionUID = 8906209595800783961L;
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33
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34 public static final Constant COMPRESSED_NULL = new HotSpotCompressedNullConstant();
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35
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36 private HotSpotCompressedNullConstant() {
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37 super(LIRKind.reference(Kind.Int));
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38 }
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39
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40 @Override
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41 public boolean isNull() {
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42 return true;
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43 }
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44
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45 @Override
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46 public boolean isDefaultForKind() {
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47 return true;
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48 }
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49
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50 @Override
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51 public Object asBoxedPrimitive() {
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52 throw new IllegalArgumentException();
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53 }
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54
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55 @Override
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56 public int asInt() {
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57 throw new IllegalArgumentException();
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58 }
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59
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60 @Override
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61 public boolean asBoolean() {
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62 throw new IllegalArgumentException();
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63 }
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64
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65 @Override
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66 public long asLong() {
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67 throw new IllegalArgumentException();
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68 }
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69
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70 @Override
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71 public float asFloat() {
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72 throw new IllegalArgumentException();
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73 }
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74
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75 @Override
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76 public double asDouble() {
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77 throw new IllegalArgumentException();
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78 }
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79
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80 @Override
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81 public String toValueString() {
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82 return "null";
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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 return System.identityHashCode(this);
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88 }
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89
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90 @Override
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91 public boolean equals(Object o) {
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92 assert o == this || !(o instanceof HotSpotCompressedNullConstant) : "null constant is a singleton";
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93 return o == this;
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94 }
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95 }