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annotate graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/ReplaceTest.java @ 19507:1cde96b96673

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Fixed code format issues.
author Roland Schatz <roland.schatz@oracle.com>
date Thu, 19 Feb 2015 16:15:56 +0100
parents a08b8694f556
children
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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
a4b84ba6dc2e Introduction of the Truffle API for efficient implementation of dynamic languages on top of the Graal VM. New projects com.oracle.truffle.api for the API definition and com.oracle.truffle.api.test for API tests and documentation.
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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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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 CallTarget target = runtime.createCallTarget(rootNode);
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63 assertEquals(rootNode, leftChild.getParent());
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64 assertEquals(rootNode, rightChild.getParent());
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65 Iterator<Node> iterator = rootNode.getChildren().iterator();
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66 Assert.assertEquals(leftChild, iterator.next());
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67 Assert.assertEquals(rightChild, iterator.next());
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68 Assert.assertFalse(iterator.hasNext());
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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 final ValueNode[] children;
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85
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86 public TestRootNode(ValueNode[] children) {
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87 super(null);
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88 this.children = children;
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89 }
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90
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91 @Override
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92 public Object execute(VirtualFrame frame) {
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93 int sum = 0;
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94 for (int i = 0; i < children.length; ++i) {
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95 sum += children[i].execute();
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96 }
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97 return sum;
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98 }
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99 }
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101 abstract class ValueNode extends Node {
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102
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103 public ValueNode() {
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104 super(null);
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105 }
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106
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107 abstract int execute();
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108 }
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109
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110 class UnresolvedNode extends ValueNode {
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111
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112 private final String value;
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113
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114 public UnresolvedNode(String value) {
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115 this.value = value;
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116 }
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117
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118 @Override
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119 int execute() {
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120 int intValue = Integer.parseInt(value);
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121 ResolvedNode newNode = this.replace(new ResolvedNode(intValue));
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122 return newNode.execute();
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123 }
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124 }
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126 class ResolvedNode extends ValueNode {
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127
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128 private final int value;
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129
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130 ResolvedNode(int value) {
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131 this.value = value;
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132 }
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134 @Override
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135 int execute() {
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136 return value;
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137 }
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138 }
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139 }