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annotate truffle/com.oracle.truffle.object/src/com/oracle/truffle/object/LocationImpl.java @ 22548:6b76a24fffbd default tip

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author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 14 Jan 2016 14:20:57 +0100
parents c9ba649b0dc1
children
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1 /*
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2 * Copyright (c) 2013, 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.truffle.object;
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24
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25 import com.oracle.truffle.api.object.DynamicObject;
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26 import com.oracle.truffle.api.object.FinalLocationException;
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27 import com.oracle.truffle.api.object.IncompatibleLocationException;
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28 import com.oracle.truffle.api.object.Location;
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29 import com.oracle.truffle.api.object.LongLocation;
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30 import com.oracle.truffle.api.object.ObjectLocation;
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31 import com.oracle.truffle.api.object.Shape;
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32 import com.oracle.truffle.api.object.TypedLocation;
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33
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34 public abstract class LocationImpl extends Location {
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35
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36 public interface EffectivelyFinalLocation<T extends Location> {
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37 T toNonFinalLocation();
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38 }
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39
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40 public interface TypedObjectLocation<T extends Location & ObjectLocation> extends ObjectLocation {
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41 T toUntypedLocation();
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42 }
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43
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44 public interface InternalLongLocation extends LongLocation {
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45 void setLongInternal(DynamicObject store, long value);
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46 }
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47
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48 public interface LocationVisitor {
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49 void visitObjectField(int index, int count);
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50
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51 void visitObjectArray(int index, int count);
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52
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53 void visitPrimitiveField(int index, int count);
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54
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55 void visitPrimitiveArray(int index, int count);
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56 }
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57
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58 @Override
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59 public void set(DynamicObject store, Object value, Shape shape) throws IncompatibleLocationException, FinalLocationException {
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60 setInternal(store, value);
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61 }
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62
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63 @Override
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64 protected final Object getInternal(DynamicObject store) {
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65 throw new UnsupportedOperationException();
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66 }
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67
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68 @Override
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69 protected abstract void setInternal(DynamicObject store, Object value) throws IncompatibleLocationException;
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70
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71 @Override
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72 public final boolean canSet(DynamicObject store, Object value) {
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73 return canStore(value) && canStoreFinal(store, value);
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74 }
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75
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76 @Override
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77 public final boolean canSet(Object value) {
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78 return canSet(null, value);
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79 }
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80
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81 @Override
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82 public boolean canStore(Object value) {
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83 return true;
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84 }
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85
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86 @SuppressWarnings("unused")
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87 protected boolean canStoreFinal(DynamicObject store, Object value) {
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88 return true;
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89 }
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90
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91 @Override
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92 public boolean isFinal() {
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93 return false;
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94 }
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95
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96 @Override
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97 public boolean isConstant() {
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98 return false;
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99 }
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100
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101 @Override
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102 public int hashCode() {
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103 final int prime = 31;
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104 int result = 1;
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105 result = prime * result + (isFinal() ? 1231 : 1237);
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106 return result;
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107 }
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108
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109 @Override
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110 public boolean equals(Object obj) {
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111 if (this == obj) {
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112 return true;
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113 }
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114 if (obj == null) {
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115 return false;
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116 }
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117 if (getClass() != obj.getClass()) {
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118 return false;
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119 }
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120 Location other = (Location) obj;
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121 if (isFinal() != other.isFinal()) {
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122 return false;
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123 }
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124 return true;
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125 }
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126
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127 @Override
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128 public String toString() {
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129 String finalString = isFinal() ? "f" : "";
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130 String typeString = (this instanceof TypedLocation ? ((TypedLocation) this).getType().getSimpleName() : "Object");
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131 return finalString + typeString + getWhereString();
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132 }
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133
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134 protected String getWhereString() {
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135 return "";
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136 }
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137
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138 /**
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139 * Get the number of object array elements this location requires.
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140 */
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141 public int objectArrayCount() {
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142 return 0;
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143 }
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144
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145 /**
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146 * Get the number of in-object {@link Object} fields this location requires.
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147 */
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148 public int objectFieldCount() {
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149 return 0;
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150 }
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151
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152 /**
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153 * Get the number of in-object primitive fields this location requires.
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154 */
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155 public int primitiveFieldCount() {
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156 return 0;
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157 }
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158
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159 /**
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160 * Get the number of primitive array elements this location requires.
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161 */
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162 public int primitiveArrayCount() {
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163 return 0;
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164 }
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165
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166 /**
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167 * Accept a visitor for location allocation for this and every nested location.
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168 *
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169 * @param locationVisitor visitor to be notified of every allocated slot in use by this location
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170 */
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171 public abstract void accept(LocationVisitor locationVisitor);
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172
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173 /**
18408
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174 * Boxed values need to be compared by value not by reference.
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175 *
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176 * The first parameter should be the one with the more precise type information.
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177 *
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178 * For sets to final locations, otherValue.equals(thisValue) seems more beneficial, since we
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179 * usually know more about the value to be set.
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180 */
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181 public static boolean valueEquals(Object val1, Object val2) {
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182 return val1 == val2 || (val1 != null && val1.equals(val2));
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183 }
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184 }