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annotate graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/FinalFieldTest.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 df1d665ca846
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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>Using Final Fields in Node Classes</h3>
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33 *
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34 * <p>
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35 * The usage of final fields in node classes is highly encouraged. It is beneficial for performance
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36 * to declare every field that is not pointing to a child node as final. This gives the Truffle
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37 * runtime an increased opportunity to optimize this node.
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38 * </p>
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39 *
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40 * <p>
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41 * If a node has a value which may change at run time, but will rarely do so, it is recommended to
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42 * speculate on the field being final. This involves starting executing with a node where this field
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43 * is final and only if this turns out to be no longer the case, the node is replaced with an
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44 * alternative implementation of the operation (see {@link ReplaceTest}).
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45 * </p>
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46 *
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47 * <p>
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48 * The next part of the Truffle API introduction is at
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49 * {@link com.oracle.truffle.api.test.ReplaceTest}.
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50 * </p>
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51 */
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52 public class FinalFieldTest {
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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 TestRootNode rootNode = new TestRootNode(new TestChildNode[]{new TestChildNode(20), new TestChildNode(22)});
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58 CallTarget target = runtime.createCallTarget(rootNode);
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59 Object result = target.call();
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60 Assert.assertEquals(42, result);
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61 }
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62
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63 class TestRootNode extends RootNode {
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65 @Children TestChildNode[] children;
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67 public TestRootNode(TestChildNode[] children) {
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68 this.children = adoptChildren(children);
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69 }
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71 @Override
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72 public Object execute(VirtualFrame frame) {
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73 int sum = 0;
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74 for (int i = 0; i < children.length; ++i) {
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75 sum += children[i].execute();
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76 }
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77 return sum;
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78 }
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79 }
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81 class TestChildNode extends Node {
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83 private final int value;
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85 public TestChildNode(int value) {
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86 this.value = value;
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87 }
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89 public int execute() {
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90 return value;
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91 }
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92 }
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93 }