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annotate graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/FrameSlotTypeSpecializationTest.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 07f8d136a05e
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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 Frame Slot Types</h3>
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33 *
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34 * <p>
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35 * Dynamically typed languages can speculate on the type of a frame slot and only fall back at run
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36 * time to a more generic type if necessary. The new type of a frame slot can be set using the
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37 * {@link FrameSlot#setType(Class)} method. It is the responsibility of the language implementor to
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38 * update the content of currently active frames (using {@link Frame#updateToLatestVersion()}).
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39 * Also, nodes that depend a specific type of a frame slot must be replaced. Such node can register
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40 * a listener that implements {@link FrameSlotTypeListener} using
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41 * {@link FrameSlot#registerOneShotTypeListener(FrameSlotTypeListener)}. The event of a type change
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42 * on the frame slot will fire only once for the next upcoming change.
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43 * </p>
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44 *
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45 * <p>
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46 * The next part of the Truffle API introduction is at
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47 * {@link com.oracle.truffle.api.test.ReturnTypeSpecializationTest}.
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48 * </p>
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49 */
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50 public class FrameSlotTypeSpecializationTest {
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51
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52 @Test
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53 public void test() {
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54 TruffleRuntime runtime = Truffle.getRuntime();
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55 FrameDescriptor frameDescriptor = new FrameDescriptor();
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56 FrameSlot slot = frameDescriptor.addFrameSlot("localVar", Integer.class);
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57 TestRootNode rootNode = new TestRootNode(new IntAssignLocal(slot, new StringTestChildNode()), new IntReadLocal(slot));
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58 CallTarget target = runtime.createCallTarget(rootNode, frameDescriptor);
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59 Assert.assertEquals(Integer.class, slot.getType());
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60 Object result = target.call();
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61 Assert.assertEquals("42", result);
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62 Assert.assertEquals(Object.class, slot.getType());
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63 }
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65 class TestRootNode extends RootNode {
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67 @Child TestChildNode left;
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68 @Child TestChildNode right;
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70 public TestRootNode(TestChildNode left, TestChildNode right) {
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71 this.left = adoptChild(left);
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72 this.right = adoptChild(right);
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73 }
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75 @Override
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76 public Object execute(VirtualFrame frame) {
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77 left.execute(frame);
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78 return right.execute(frame);
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79 }
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80 }
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81
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82 abstract class TestChildNode extends Node {
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83
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84 abstract Object execute(VirtualFrame frame);
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85 }
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86
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87 abstract class FrameSlotNode extends TestChildNode {
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88
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89 protected final FrameSlot slot;
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90
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91 public FrameSlotNode(FrameSlot slot) {
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92 this.slot = slot;
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93 }
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94 }
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95
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96 class StringTestChildNode extends TestChildNode {
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97
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98 @Override
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99 Object execute(VirtualFrame frame) {
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100 return "42";
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101 }
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102
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103 }
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104
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105 class IntAssignLocal extends FrameSlotNode implements FrameSlotTypeListener {
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106
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107 @Child private TestChildNode value;
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108
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109 IntAssignLocal(FrameSlot slot, TestChildNode value) {
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110 super(slot);
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111 this.value = adoptChild(value);
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112 slot.registerOneShotTypeListener(this);
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113 }
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114
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115 @Override
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116 Object execute(VirtualFrame frame) {
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117 Object o = value.execute(frame);
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118 if (o instanceof Integer) {
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119 frame.setInt(slot, (Integer) o);
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120 } else {
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121 slot.setType(Object.class);
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122 frame.updateToLatestVersion();
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123 frame.setObject(slot, o);
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124 }
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125 return null;
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126 }
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127
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128 @Override
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129 public void typeChanged(FrameSlot changedSlot, Class<?> oldType) {
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130 if (changedSlot.getType() == Object.class) {
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131 this.replace(new ObjectAssignLocal(changedSlot, value));
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132 }
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133 }
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134 }
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135
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136 class ObjectAssignLocal extends FrameSlotNode {
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137
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138 @Child private TestChildNode value;
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139
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140 ObjectAssignLocal(FrameSlot slot, TestChildNode value) {
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141 super(slot);
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142 this.value = adoptChild(value);
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143 }
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144
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145 @Override
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146 Object execute(VirtualFrame frame) {
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147 Object o = value.execute(frame);
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148 frame.setObject(slot, o);
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149 return null;
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150 }
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151 }
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152
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153 class IntReadLocal extends FrameSlotNode implements FrameSlotTypeListener {
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154
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155 IntReadLocal(FrameSlot slot) {
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156 super(slot);
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157 slot.registerOneShotTypeListener(this);
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158 }
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159
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160 @Override
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161 Object execute(VirtualFrame frame) {
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162 return frame.getInt(slot);
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163 }
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165 @Override
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166 public void typeChanged(FrameSlot changedSlot, Class<?> oldType) {
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167 if (changedSlot.getType() == Object.class) {
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168 this.replace(new ObjectReadLocal(changedSlot));
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169 }
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170 }
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171 }
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173 class ObjectReadLocal extends FrameSlotNode {
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174
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175 ObjectReadLocal(FrameSlot slot) {
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176 super(slot);
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177 }
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179 @Override
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180 Object execute(VirtualFrame frame) {
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181 return frame.getObject(slot);
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182 }
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183 }
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184 }