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annotate graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/ReturnTypeSpecializationTest.java @ 7530:5e3d1a68664e

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applied mx eclipseformat to all Java files
author Doug Simon <doug.simon@oracle.com>
date Wed, 23 Jan 2013 16:34:57 +0100
parents a4b84ba6dc2e
children 0ac3e388445f
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1 /*
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2 * Copyright (c) 2012, 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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25 import org.junit.*;
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27 import com.oracle.truffle.api.*;
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28 import com.oracle.truffle.api.frame.*;
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29 import com.oracle.truffle.api.nodes.*;
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31 /**
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32 * <h3>Specializing Return Types</h3>
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33 *
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34 * <p>
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35 * In order to avoid boxing and/or type casts on the return value of a node, the return value the
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36 * method for executing a node can have a specific type and need not be of type
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37 * {@link java.lang.Object}. For dynamically typed languages, this return type is something that
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38 * should be speculated on. When the speculation fails and the child node cannot return the
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39 * appropriate type of value, it can use an {@link UnexpectedResultException} to still pass the
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40 * result to the caller. In such a case, the caller must rewrite itself to a more general version in
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41 * oder to avoid future failures of this kind.
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42 * </p>
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43 */
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44 public class ReturnTypeSpecializationTest {
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46 @Test
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47 public void test() {
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48 TruffleRuntime runtime = Truffle.getRuntime();
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49 FrameDescriptor frameDescriptor = new FrameDescriptor();
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50 FrameSlot slot = frameDescriptor.addFrameSlot("localVar", Integer.class);
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51 TestRootNode rootNode = new TestRootNode(new IntAssignLocal(slot, new StringTestChildNode()), new IntReadLocal(slot));
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52 CallTarget target = runtime.createCallTarget(rootNode, frameDescriptor);
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53 Assert.assertEquals(Integer.class, slot.getType());
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54 Object result = target.call();
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55 Assert.assertEquals("42", result);
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56 Assert.assertEquals(Object.class, slot.getType());
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57 }
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59 class TestRootNode extends RootNode {
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61 @Child TestChildNode left;
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62 @Child TestChildNode right;
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64 public TestRootNode(TestChildNode left, TestChildNode right) {
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65 this.left = adoptChild(left);
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66 this.right = adoptChild(right);
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67 }
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69 @Override
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70 public Object execute(VirtualFrame frame) {
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71 left.execute(frame);
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72 return right.execute(frame);
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73 }
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74 }
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76 abstract class TestChildNode extends Node {
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77
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78 abstract Object execute(VirtualFrame frame);
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80 int executeInt(VirtualFrame frame) throws UnexpectedResultException {
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81 Object result = execute(frame);
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82 if (result instanceof Integer) {
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83 return (Integer) result;
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84 }
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85 throw new UnexpectedResultException(result);
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86 }
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87 }
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88
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89 abstract class FrameSlotNode extends TestChildNode {
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90
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91 protected final FrameSlot slot;
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92
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93 public FrameSlotNode(FrameSlot slot) {
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94 this.slot = slot;
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95 }
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96 }
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97
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98 class StringTestChildNode extends TestChildNode {
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99
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100 @Override
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101 Object execute(VirtualFrame frame) {
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102 return "42";
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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 class IntAssignLocal extends FrameSlotNode implements FrameSlotTypeListener {
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108
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109 @Child private TestChildNode value;
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110
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111 IntAssignLocal(FrameSlot slot, TestChildNode value) {
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112 super(slot);
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113 this.value = adoptChild(value);
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114 slot.registerOneShotTypeListener(this);
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115 }
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116
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117 @Override
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118 Object execute(VirtualFrame frame) {
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119 try {
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120 frame.setInt(slot, value.executeInt(frame));
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121 } catch (UnexpectedResultException e) {
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122 slot.setType(Object.class);
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123 frame.updateToLatestVersion();
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124 frame.setObject(slot, e.getResult());
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125 }
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126 return null;
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127 }
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128
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129 @Override
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130 public void typeChanged(FrameSlot changedSlot, Class<?> oldType) {
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131 if (changedSlot.getType() == Object.class) {
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132 this.replace(new ObjectAssignLocal(changedSlot, value));
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133 }
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134 }
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135 }
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136
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137 class ObjectAssignLocal extends FrameSlotNode {
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138
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139 @Child private TestChildNode value;
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140
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141 ObjectAssignLocal(FrameSlot slot, TestChildNode value) {
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142 super(slot);
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143 this.value = adoptChild(value);
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144 }
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145
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146 @Override
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147 Object execute(VirtualFrame frame) {
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148 Object o = value.execute(frame);
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149 frame.setObject(slot, o);
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150 return null;
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151 }
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152 }
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153
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154 class IntReadLocal extends FrameSlotNode implements FrameSlotTypeListener {
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155
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156 IntReadLocal(FrameSlot slot) {
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157 super(slot);
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158 slot.registerOneShotTypeListener(this);
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159 }
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160
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161 @Override
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162 Object execute(VirtualFrame frame) {
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163 return executeInt(frame);
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164 }
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165
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166 @Override
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167 int executeInt(VirtualFrame frame) {
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168 return frame.getInt(slot);
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169 }
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170
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171 @Override
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172 public void typeChanged(FrameSlot changedSlot, Class<?> oldType) {
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173 if (changedSlot.getType() == Object.class) {
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174 this.replace(new ObjectReadLocal(changedSlot));
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175 }
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176 }
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177 }
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178
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179 class ObjectReadLocal extends FrameSlotNode {
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180
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181 ObjectReadLocal(FrameSlot slot) {
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182 super(slot);
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183 }
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184
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185 @Override
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186 Object execute(VirtualFrame frame) {
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187 return frame.getObject(slot);
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188 }
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189 }
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190 }