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annotate graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/ReplaceTest.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
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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 static org.junit.Assert.*;
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27 import java.util.*;
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29 import org.junit.*;
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31 import com.oracle.truffle.api.*;
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32 import com.oracle.truffle.api.frame.*;
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33 import com.oracle.truffle.api.nodes.*;
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34
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35 /**
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36 * <h3>Replacing Nodes at Run Time</h3>
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37 *
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38 * <p>
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39 * The structure of the Truffle tree can be changed at run time by replacing nodes using the
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40 * {@link Node#replace(Node)} method. This method will automatically change the child pointer in the
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41 * parent of the node and replace it with a pointer to the new node.
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42 * </p>
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43 *
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44 * <p>
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45 * Replacing nodes is a costly operation, so it should not happen too often. The convention is that
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46 * the implementation of the Truffle nodes should ensure that there are maximal a small (and
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47 * constant) number of node replacements per Truffle node.
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48 * </p>
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49 *
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50 * <p>
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51 * The next part of the Truffle API introduction is at {@link com.oracle.truffle.api.test.CallTest}.
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52 * </p>
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53 */
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54 public class ReplaceTest {
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55
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56 @Test
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57 public void test() {
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58 TruffleRuntime runtime = Truffle.getRuntime();
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59 UnresolvedNode leftChild = new UnresolvedNode("20");
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60 UnresolvedNode rightChild = new UnresolvedNode("22");
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61 TestRootNode rootNode = new TestRootNode(new ValueNode[]{leftChild, rightChild});
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62 assertEquals(rootNode, leftChild.getParent());
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63 assertEquals(rootNode, rightChild.getParent());
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64 Iterator<Node> iterator = rootNode.getChildren().iterator();
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65 Assert.assertEquals(leftChild, iterator.next());
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66 Assert.assertEquals(rightChild, iterator.next());
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67 Assert.assertFalse(iterator.hasNext());
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68 CallTarget target = runtime.createCallTarget(rootNode);
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69 Object result = target.call();
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70 assertEquals(42, result);
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71 assertEquals(42, target.call());
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72 iterator = rootNode.getChildren().iterator();
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73 Assert.assertEquals(ResolvedNode.class, iterator.next().getClass());
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74 Assert.assertEquals(ResolvedNode.class, iterator.next().getClass());
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75 Assert.assertFalse(iterator.hasNext());
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76 iterator = rootNode.getChildren().iterator();
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77 Assert.assertEquals(rootNode, iterator.next().getParent());
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78 Assert.assertEquals(rootNode, iterator.next().getParent());
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79 Assert.assertFalse(iterator.hasNext());
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80 }
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81
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82 class TestRootNode extends RootNode {
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83
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84 @Children private ValueNode[] children;
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85
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86 public TestRootNode(ValueNode[] children) {
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87 this.children = adoptChildren(children);
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88 }
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89
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90 @Override
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91 public Object execute(VirtualFrame frame) {
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92 int sum = 0;
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93 for (int i = 0; i < children.length; ++i) {
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94 sum += children[i].execute();
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95 }
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96 return sum;
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97 }
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98 }
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99
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100 abstract class ValueNode extends Node {
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101
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102 abstract int execute();
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103 }
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104
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105 class UnresolvedNode extends ValueNode {
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106
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107 private final String value;
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108
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109 public UnresolvedNode(String value) {
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110 this.value = value;
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111 }
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112
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113 @Override
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114 int execute() {
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115 int intValue = Integer.parseInt(value);
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116 ResolvedNode newNode = this.replace(new ResolvedNode(intValue));
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117 return newNode.execute();
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118 }
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119 }
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120
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121 class ResolvedNode extends ValueNode {
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122
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123 private final int value;
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124
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125 ResolvedNode(int value) {
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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 int execute() {
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131 return value;
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132 }
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133 }
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134 }