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annotate truffle/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/ReturnTypeSpecializationTest.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 5bc7f7b867ab
children 14e6dfb1ef05
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1 /*
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2 * Copyright (c) 2012, 2013, 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.api.test;
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24
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25 import com.oracle.truffle.api.CallTarget;
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26 import com.oracle.truffle.api.Truffle;
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27 import com.oracle.truffle.api.TruffleRuntime;
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28 import com.oracle.truffle.api.frame.FrameDescriptor;
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29 import com.oracle.truffle.api.frame.FrameSlot;
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30 import com.oracle.truffle.api.frame.FrameSlotKind;
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31 import com.oracle.truffle.api.frame.FrameSlotTypeException;
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32 import com.oracle.truffle.api.frame.VirtualFrame;
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33 import com.oracle.truffle.api.nodes.Node;
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34 import com.oracle.truffle.api.nodes.RootNode;
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35 import com.oracle.truffle.api.nodes.UnexpectedResultException;
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36 import org.junit.Assert;
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37 import org.junit.Test;
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38
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39 /**
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40 * <h3>Specializing Return Types</h3>
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41 *
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42 * <p>
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43 * In order to avoid boxing and/or type casts on the return value of a node, the return value the
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44 * method for executing a node can have a specific type and need not be of type
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45 * {@link java.lang.Object}. For dynamically typed languages, this return type is something that
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46 * should be speculated on. When the speculation fails and the child node cannot return the
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47 * appropriate type of value, it can use an {@link UnexpectedResultException} to still pass the
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48 * result to the caller. In such a case, the caller must rewrite itself to a more general version in
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49 * order to avoid future failures of this kind.
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50 * </p>
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51 */
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52 public class ReturnTypeSpecializationTest {
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53
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54 @Test
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55 public void test() {
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56 TruffleRuntime runtime = Truffle.getRuntime();
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57 FrameDescriptor frameDescriptor = new FrameDescriptor();
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58 FrameSlot slot = frameDescriptor.addFrameSlot("localVar", FrameSlotKind.Int);
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59 TestRootNode rootNode = new TestRootNode(frameDescriptor, new IntAssignLocal(slot, new StringTestChildNode()), new IntReadLocal(slot));
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60 CallTarget target = runtime.createCallTarget(rootNode);
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61 Assert.assertEquals(FrameSlotKind.Int, slot.getKind());
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62 Object result = target.call();
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63 Assert.assertEquals("42", result);
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64 Assert.assertEquals(FrameSlotKind.Object, slot.getKind());
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65 }
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67 class TestRootNode extends RootNode {
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69 @Child TestChildNode left;
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70 @Child TestChildNode right;
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71
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72 public TestRootNode(FrameDescriptor descriptor, TestChildNode left, TestChildNode right) {
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73 super(TestingLanguage.class, null, descriptor);
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74 this.left = left;
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75 this.right = right;
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76 }
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78 @Override
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79 public Object execute(VirtualFrame frame) {
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80 left.execute(frame);
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81 return right.execute(frame);
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82 }
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83 }
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84
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85 abstract class TestChildNode extends Node {
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86
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87 public TestChildNode() {
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88 super(null);
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89 }
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90
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91 abstract Object execute(VirtualFrame frame);
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92
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93 int executeInt(VirtualFrame frame) throws UnexpectedResultException {
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94 Object result = execute(frame);
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95 if (result instanceof Integer) {
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96 return (Integer) result;
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97 }
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98 throw new UnexpectedResultException(result);
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99 }
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100 }
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101
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102 abstract class FrameSlotNode extends TestChildNode {
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103
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104 protected final FrameSlot slot;
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105
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106 public FrameSlotNode(FrameSlot slot) {
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107 this.slot = slot;
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108 }
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109 }
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110
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111 class StringTestChildNode extends TestChildNode {
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112
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113 @Override
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114 Object execute(VirtualFrame frame) {
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115 return "42";
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116 }
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117
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118 }
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119
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120 class IntAssignLocal extends FrameSlotNode {
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121
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122 @Child private TestChildNode value;
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123
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124 IntAssignLocal(FrameSlot slot, TestChildNode value) {
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125 super(slot);
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126 this.value = value;
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127 }
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128
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129 @Override
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130 Object execute(VirtualFrame frame) {
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131 try {
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132 int result = value.executeInt(frame);
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133 frame.setInt(slot, result);
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134 } catch (UnexpectedResultException e) {
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135 slot.setKind(FrameSlotKind.Object);
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136 frame.setObject(slot, e.getResult());
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137 replace(new ObjectAssignLocal(slot, value));
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138 }
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139 return null;
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140 }
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141 }
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142
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143 class ObjectAssignLocal extends FrameSlotNode {
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144
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145 @Child private TestChildNode value;
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146
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147 ObjectAssignLocal(FrameSlot slot, TestChildNode value) {
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148 super(slot);
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149 this.value = value;
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150 }
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151
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152 @Override
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153 Object execute(VirtualFrame frame) {
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154 Object o = value.execute(frame);
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155 slot.setKind(FrameSlotKind.Object);
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156 frame.setObject(slot, o);
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157 return null;
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158 }
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159 }
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160
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161 class IntReadLocal extends FrameSlotNode {
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162
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163 IntReadLocal(FrameSlot slot) {
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164 super(slot);
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165 }
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166
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167 @Override
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168 Object execute(VirtualFrame frame) {
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169 try {
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170 return frame.getInt(slot);
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171 } catch (FrameSlotTypeException e) {
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172 return replace(new ObjectReadLocal(slot)).execute(frame);
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173 }
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174 }
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175
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176 @Override
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177 int executeInt(VirtualFrame frame) throws UnexpectedResultException {
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178 try {
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179 return frame.getInt(slot);
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180 } catch (FrameSlotTypeException e) {
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181 return replace(new ObjectReadLocal(slot)).executeInt(frame);
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182 }
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183 }
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184 }
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185
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186 class ObjectReadLocal extends FrameSlotNode {
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187
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188 ObjectReadLocal(FrameSlot slot) {
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189 super(slot);
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190 }
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192 @Override
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193 Object execute(VirtualFrame frame) {
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194 try {
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195 return frame.getObject(slot);
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196 } catch (FrameSlotTypeException e) {
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197 throw new IllegalStateException(e);
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198 }
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199 }
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200 }
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201 }