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annotate graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/ArgumentsTest.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 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>Passing Arguments</h3>
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33 *
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34 * <p>
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35 * A guest language can pass its own custom arguments when invoking a Truffle method by creating a
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36 * subclass of {@link Arguments}. When invoking a call target with
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37 * {@link CallTarget#call(Arguments)}, the arguments can be passed. A Truffle node can access the
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38 * arguments passed into the Truffle method by using {@link VirtualFrame#getArguments()}.
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39 * </p>
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40 *
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41 * <p>
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42 * The arguments class should only contain fields that are declared as final. This allows the
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43 * Truffle runtime to improve optimizations around guest language method calls. Also, the arguments
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44 * object must never be stored into a field. It should be created immediately before invoking
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45 * {@link CallTarget#call(Arguments)} and no longer be accessed afterwards.
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46 * </p>
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47 *
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48 * <p>
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49 * The next part of the Truffle API introduction is at {@link com.oracle.truffle.api.test.FrameTest}
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50 * .
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51 * </p>
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52 */
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53 public class ArgumentsTest {
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54
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55 @Test
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56 public void test() {
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57 TruffleRuntime runtime = Truffle.getRuntime();
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58 TestRootNode rootNode = new TestRootNode(new TestArgumentNode[]{new TestArgumentNode(0), new TestArgumentNode(1)});
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59 CallTarget target = runtime.createCallTarget(rootNode);
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60 Object result = target.call(new TestArguments(20, 22));
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61 Assert.assertEquals(42, result);
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62 }
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64 class TestArguments extends Arguments {
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65
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66 final int[] values;
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67
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68 TestArguments(int... values) {
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69 this.values = values;
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70 }
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71 }
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73 class TestRootNode extends RootNode {
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75 @Children private TestArgumentNode[] children;
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77 TestRootNode(TestArgumentNode[] children) {
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78 this.children = adoptChildren(children);
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79 }
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81 @Override
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82 public Object execute(VirtualFrame frame) {
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83 int sum = 0;
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84 for (int i = 0; i < children.length; ++i) {
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85 sum += children[i].execute(frame);
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86 }
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87 return sum;
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88 }
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89 }
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90
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91 class TestArgumentNode extends Node {
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92
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93 private final int index;
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94
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95 TestArgumentNode(int index) {
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96 this.index = index;
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97 }
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98
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99 int execute(VirtualFrame frame) {
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100 return ((TestArguments) frame.getArguments()).values[index];
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101 }
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102 }
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103 }