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annotate c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/HotSpotField.java @ 1941:79d04223b8a5

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Added caching for resolved types and resolved fields. This is crucial, because the local load elimination will lead to wrong results, if field equality (of two RiField objects with the same object and the same RiType) is not given. The caching makes sure that the default equals implementation is sufficient.
author Thomas Wuerthinger <wuerthinger@ssw.jku.at>
date Tue, 28 Dec 2010 18:33:26 +0100
parents 2c754f3a2722
children 3c0a889a176b
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1 /*
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2 * Copyright (c) 2010 Sun Microsystems, Inc. All rights reserved.
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3 *
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4 * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
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5 * that is described in this document. In particular, and without limitation, these intellectual property
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6 * rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
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7 * more additional patents or pending patent applications in the U.S. and in other countries.
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8 *
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9 * U.S. Government Rights - Commercial software. Government users are subject to the Sun
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10 * Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
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11 * supplements.
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12 *
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13 * Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
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14 * registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
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15 * are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
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16 * U.S. and other countries.
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17 *
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18 * UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
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19 * Company, Ltd.
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20 */
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21
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22 package com.sun.hotspot.c1x;
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23
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24 import com.sun.cri.ci.CiConstant;
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25 import com.sun.cri.ci.CiKind;
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26 import com.sun.cri.ri.RiField;
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27 import com.sun.cri.ri.RiType;
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28
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29 /**
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30 * Represents a field in a HotSpot type.
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31 *
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32 * @author Thomas Wuerthinger, Lukas Stadler
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33 */
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34 public class HotSpotField implements RiField, CompilerObject {
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35
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36 private final RiType holder;
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37 private final String name;
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38 private final RiType type;
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39 private final int offset;
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40 private CiConstant constant;
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41
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42 public HotSpotField(RiType holder, String name, RiType type, int offset) {
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43 this.holder = holder;
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44 this.name = name;
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45 this.type = type;
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46 this.offset = offset;
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47 }
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48
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49 @Override
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50 public int accessFlags() {
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51 // TODO Auto-generated method stub
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52 return 0;
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53 }
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54
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55 @Override
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56 public CiConstant constantValue(Object object) {
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57 if (object == null) {
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58 // Constant part only valid for static fields.
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59 return constant;
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60 }
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61 return null;
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62 }
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63
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64 @Override
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65 public RiType holder() {
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66 return holder;
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67 }
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68
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69 @Override
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70 public boolean equals(Object obj) {
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71 if (obj instanceof HotSpotField) {
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72 HotSpotField other = (HotSpotField) obj;
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73 return other.offset == offset && other.holder.equals(holder());
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74 }
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75 return false;
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76 }
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77
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78 @Override
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79 public boolean isResolved() {
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80 return offset != -1;
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81 }
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82
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83 @Override
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84 public CiKind kind() {
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85 return type().kind();
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86 }
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87
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88 @Override
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89 public String name() {
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90 return name;
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91 }
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92
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93 @Override
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94 public RiType type() {
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95 return type;
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96 }
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97
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98 public int offset() {
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99 return offset;
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100 }
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101
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102 @Override
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103 public String toString() {
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104 return "HotSpotField<" + ((HotSpotType) holder).simpleName() + "." + name + ">";
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105 }
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106
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107 }