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annotate truffle/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/access/SLWritePropertyCacheNode.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 503529c65456
children 15c9dda91e50
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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 * The Universal Permissive License (UPL), Version 1.0
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6 *
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7 * Subject to the condition set forth below, permission is hereby granted to any
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8 * person obtaining a copy of this software, associated documentation and/or
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9 * data (collectively the "Software"), free of charge and under any and all
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10 * copyright rights in the Software, and any and all patent rights owned or
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11 * freely licensable by each licensor hereunder covering either (i) the
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12 * unmodified Software as contributed to or provided by such licensor, or (ii)
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13 * the Larger Works (as defined below), to deal in both
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14 *
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15 * (a) the Software, and
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16 *
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17 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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18 * one is included with the Software each a "Larger Work" to which the Software
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19 * is contributed by such licensors),
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20 *
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21 * without restriction, including without limitation the rights to copy, create
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22 * derivative works of, display, perform, and distribute the Software and make,
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23 * use, sell, offer for sale, import, export, have made, and have sold the
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24 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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25 * either these or other terms.
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26 *
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27 * This license is subject to the following condition:
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28 *
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29 * The above copyright notice and either this complete permission notice or at a
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30 * minimum a reference to the UPL must be included in all copies or substantial
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31 * portions of the Software.
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32 *
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33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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34 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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35 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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36 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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37 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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38 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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39 * SOFTWARE.
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40 */
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41 package com.oracle.truffle.sl.nodes.access;
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42
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43 import com.oracle.truffle.api.Assumption;
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44 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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45 import com.oracle.truffle.api.Truffle;
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46 import com.oracle.truffle.api.dsl.Cached;
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47 import com.oracle.truffle.api.dsl.Specialization;
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48 import com.oracle.truffle.api.nodes.Node;
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49 import com.oracle.truffle.api.object.DynamicObject;
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50 import com.oracle.truffle.api.object.FinalLocationException;
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51 import com.oracle.truffle.api.object.IncompatibleLocationException;
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52 import com.oracle.truffle.api.object.Location;
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53 import com.oracle.truffle.api.object.Property;
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54 import com.oracle.truffle.api.object.Shape;
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55
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56 public abstract class SLWritePropertyCacheNode extends Node {
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57
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58 protected final String propertyName;
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59
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60 public SLWritePropertyCacheNode(String propertyName) {
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61 this.propertyName = propertyName;
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62 }
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63
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64 public abstract void executeObject(DynamicObject receiver, Object value);
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65
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66 @Specialization(guards = "location.isValid(receiver, value)", assumptions = "location.getAssumptions()")
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67 public void writeCached(DynamicObject receiver, Object value, //
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68 @Cached("createCachedWrite(receiver, value)") CachedWriteLocation location) {
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69 if (location.writeUnchecked(receiver, value)) {
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70 // write successful
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71 } else {
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72 executeObject(receiver, value);
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73 }
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74 }
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75
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76 @Specialization(contains = "writeCached")
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77 @TruffleBoundary
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78 public void writeGeneric(DynamicObject receiver, Object value, //
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79 @Cached("new(createCachedWrite(receiver, value))") LRUCachedWriteLocation lru) {
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80 CachedWriteLocation location = lru.location;
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81 if (!location.isValid(receiver, value) || !location.areAssumptionsValid()) {
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82 location = createCachedWrite(receiver, value);
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83 lru.location = location;
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84 }
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85 if (location.writeUnchecked(receiver, value)) {
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86 // write successful
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87 } else {
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88 executeObject(receiver, value);
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89 }
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90 }
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91
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92 protected CachedWriteLocation createCachedWrite(DynamicObject receiver, Object value) {
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93 while (receiver.updateShape()) {
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94 // multiple shape updates might be needed.
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95 }
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96
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97 Shape oldShape = receiver.getShape();
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98 Shape newShape;
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99 Property property = oldShape.getProperty(propertyName);
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100
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101 if (property != null && property.getLocation().canSet(receiver, value)) {
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102 newShape = oldShape;
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103 } else {
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104 receiver.define(propertyName, value, 0);
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105 newShape = receiver.getShape();
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106 property = newShape.getProperty(propertyName);
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107 }
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108
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109 if (!oldShape.check(receiver)) {
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110 return createCachedWrite(receiver, value);
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111 }
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112
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113 return new CachedWriteLocation(oldShape, newShape, property.getLocation());
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114
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115 }
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116
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117 protected static final class CachedWriteLocation {
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118
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119 private final Shape oldShape;
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120 private final Shape newShape;
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121 private final Location location;
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122 private final Assumption validLocation = Truffle.getRuntime().createAssumption();
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123
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124 public CachedWriteLocation(Shape oldShape, Shape newShape, Location location) {
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125 this.oldShape = oldShape;
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126 this.newShape = newShape;
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127 this.location = location;
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128 }
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129
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130 public boolean areAssumptionsValid() {
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131 return validLocation.isValid() && oldShape.getValidAssumption().isValid() && newShape.getValidAssumption().isValid();
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132 }
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133
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134 public Assumption[] getAssumptions() {
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135 return new Assumption[]{oldShape.getValidAssumption(), newShape.getValidAssumption(), validLocation};
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136 }
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137
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138 public boolean isValid(DynamicObject receiver, Object value) {
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139 return oldShape.check(receiver) && location.canSet(receiver, value);
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140 }
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141
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142 public boolean writeUnchecked(DynamicObject receiver, Object value) {
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143 try {
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144 if (oldShape == newShape) {
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145 location.set(receiver, value, oldShape);
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146 } else {
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147 location.set(receiver, value, oldShape, newShape);
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148 }
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149 return true;
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150 } catch (IncompatibleLocationException | FinalLocationException e) {
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151 validLocation.invalidate();
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152 return false;
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153 }
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154 }
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155 }
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156
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157 protected static final class LRUCachedWriteLocation {
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158
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159 private CachedWriteLocation location;
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160
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161 public LRUCachedWriteLocation(CachedWriteLocation location) {
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162 this.location = location;
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163 }
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164
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165 }
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166
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167 }