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annotate truffle/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Location.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 e3aef4c65ea1
children
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1 /*
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2 * Copyright (c) 2013, 2015, 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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.object;
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26
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27 import com.oracle.truffle.api.CompilerDirectives;
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28
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29 /**
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30 * Property location.
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31 *
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32 * @see Shape
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33 * @see Property
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34 * @see DynamicObject
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35 */
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36 public abstract class Location {
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37 protected static IncompatibleLocationException incompatibleLocation() throws IncompatibleLocationException {
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38 CompilerDirectives.transferToInterpreterAndInvalidate();
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39 throw new IncompatibleLocationException();
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40 }
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41
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42 protected static FinalLocationException finalLocation() throws FinalLocationException {
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43 CompilerDirectives.transferToInterpreterAndInvalidate();
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44 throw new FinalLocationException();
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45 }
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46
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47 /**
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48 * Get object value as object at this location in store.
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49 *
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50 * @param shape the current shape of the object, which must contain this location
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51 */
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52 public final Object get(DynamicObject store, Shape shape) {
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53 return get(store, checkShape(store, shape));
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54 }
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55
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56 /**
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57 * Get object value as object at this location in store. For internal use only and subject to
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58 * change, use {@link #get(DynamicObject, Shape)} instead.
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59 *
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60 * @param condition the result of a shape check or {@code false}
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61 * @see #get(DynamicObject, Shape)
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62 */
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63 public Object get(DynamicObject store, boolean condition) {
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64 return getInternal(store);
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65 }
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66
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67 /**
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68 * Get object value as object at this location in store.
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69 *
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70 */
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71 public final Object get(DynamicObject store) {
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72 return get(store, false);
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73 }
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74
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75 /**
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76 * Set object value at this location in store.
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77 *
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78 * @param shape the current shape of the storage object
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79 * @throws IncompatibleLocationException for storage type invalidations
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80 * @throws FinalLocationException for effectively final fields
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81 */
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82 public void set(DynamicObject store, Object value, Shape shape) throws IncompatibleLocationException, FinalLocationException {
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83 setInternal(store, value);
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84 }
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85
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86 /**
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87 * Set object value at this location in store and update shape.
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88 *
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89 * @param oldShape the shape before the transition
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90 * @param newShape new shape after the transition
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91 * @throws IncompatibleLocationException if value is of non-assignable type
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92 */
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93 public final void set(DynamicObject store, Object value, Shape oldShape, Shape newShape) throws IncompatibleLocationException {
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94 if (canStore(value)) {
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95 store.setShapeAndGrow(oldShape, newShape);
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96 try {
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97 setInternal(store, value);
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98 } catch (IncompatibleLocationException ex) {
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99 throw new IllegalStateException();
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100 }
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101 } else {
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102 throw incompatibleLocation();
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103 }
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104 }
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105
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106 /**
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107 * Set object value at this location in store.
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108 *
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109 * @throws IncompatibleLocationException for storage type invalidations
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110 * @throws FinalLocationException for effectively final fields
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111 */
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112 public final void set(DynamicObject store, Object value) throws IncompatibleLocationException, FinalLocationException {
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113 set(store, value, null);
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114 }
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115
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116 protected abstract Object getInternal(DynamicObject store);
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117
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118 /**
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119 * Like {@link #set(DynamicObject, Object, Shape)}, but does not invalidate final locations. For
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120 * internal use only and subject to change, use {@link DynamicObjectFactory} to create objects
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121 * with predefined properties.
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122 *
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123 * @throws IncompatibleLocationException if value is of non-assignable type
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124 */
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125 protected abstract void setInternal(DynamicObject store, Object value) throws IncompatibleLocationException;
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126
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127 /**
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128 * Returns {@code true} if the location can be set to the value.
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129 *
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130 * @param store the receiver object
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131 * @param value the value in question
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132 */
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133 public boolean canSet(DynamicObject store, Object value) {
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134 return canStore(value);
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135 }
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136
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137 /**
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138 * Returns {@code true} if the location can be set to the value.
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139 *
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140 * @param value the value in question
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141 */
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142 public boolean canSet(Object value) {
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143 return canStore(value);
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144 }
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145
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146 /**
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147 * Returns {@code true} if the location is compatible with the value.
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148 *
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149 * The value may still be rejected if {@link #canSet(DynamicObject, Object)} returns false.
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150 *
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151 * @param value the value in question
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152 */
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153 public boolean canStore(Object value) {
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154 return true;
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155 }
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156
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157 /**
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158 * Returns {@code true} if this is a final location, i.e. readonly once set.
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159 */
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160 public boolean isFinal() {
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161 return false;
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162 }
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163
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164 /**
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165 * Returns {@code true} if this is an immutable constant location.
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166 */
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167 public boolean isConstant() {
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168 return false;
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169 }
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170
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171 /*
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172 * Abstract to force overriding.
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173 */
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174 @Override
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175 public abstract int hashCode();
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176
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177 /*
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178 * Abstract to force overriding.
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179 */
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180 @Override
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181 public abstract boolean equals(Object obj);
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182
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183 /**
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184 * Equivalent to {@link Shape#check(DynamicObject)}.
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185 */
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186 protected static boolean checkShape(DynamicObject store, Shape shape) {
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187 return store.getShape() == shape;
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188 }
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189 }