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annotate truffle/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/ArgumentsTest.java @ 22219:1c0f490984d5

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Merge with f47b601edbc626dcfe8b3636933b4834c89f7779
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Wed, 16 Sep 2015 15:36:22 -0700
parents dc83cc1f94f2
children 14e6dfb1ef05
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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
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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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24
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25 import org.junit.Assert;
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26 import org.junit.Test;
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27
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28 import com.oracle.truffle.api.CallTarget;
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29 import com.oracle.truffle.api.Truffle;
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30 import com.oracle.truffle.api.TruffleRuntime;
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31 import com.oracle.truffle.api.frame.VirtualFrame;
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32 import com.oracle.truffle.api.nodes.Node;
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33 import com.oracle.truffle.api.nodes.RootNode;
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34
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35 /**
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36 * <h3>Passing Arguments</h3>
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37 *
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38 * <p>
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39 * When invoking a call target with {@link CallTarget#call(Object[])}, arguments can be passed. A
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40 * Truffle node can access the arguments passed into the Truffle method by using
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41 * {@link VirtualFrame#getArguments}.
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42 * </p>
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43 *
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44 * <p>
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45 * The arguments class should only contain fields that are declared as final. This allows the
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46 * Truffle runtime to improve optimizations around guest language method calls. Also, the arguments
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47 * object array must never be stored into a field. It should be created immediately before invoking
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48 * {@link CallTarget#call(Object[])} and no longer be accessed afterwards.
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49 * </p>
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50 *
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51 * <p>
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52 * The next part of the Truffle API introduction is at {@link com.oracle.truffle.api.test.FrameTest}
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53 * .
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54 * </p>
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55 */
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56 public class ArgumentsTest {
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57
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58 @Test
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59 public void test() {
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60 TruffleRuntime runtime = Truffle.getRuntime();
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61 TestRootNode rootNode = new TestRootNode(new TestArgumentNode[]{new TestArgumentNode(0), new TestArgumentNode(1)});
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62 CallTarget target = runtime.createCallTarget(rootNode);
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63 Object result = target.call(new Object[]{20, 22});
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64 Assert.assertEquals(42, result);
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65 }
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66
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67 private static class TestRootNode extends RootNode {
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68
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69 @Children private final TestArgumentNode[] children;
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71 TestRootNode(TestArgumentNode[] children) {
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72 super(TestingLanguage.class, null, null);
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73 this.children = children;
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74 }
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76 @Override
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77 public Object execute(VirtualFrame frame) {
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78 int sum = 0;
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79 for (int i = 0; i < children.length; ++i) {
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80 sum += children[i].execute(frame);
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81 }
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82 return sum;
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83 }
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86 private static class TestArgumentNode extends Node {
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88 private final int index;
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90 TestArgumentNode(int index) {
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91 super(null);
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92 this.index = index;
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95 int execute(VirtualFrame frame) {
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96 return (Integer) frame.getArguments()[index];
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