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annotate truffle/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/RootNodeTest.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 5bc7f7b867ab
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 com.oracle.truffle.api.CallTarget;
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26 import com.oracle.truffle.api.Truffle;
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27 import com.oracle.truffle.api.TruffleRuntime;
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28 import com.oracle.truffle.api.frame.VirtualFrame;
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29 import com.oracle.truffle.api.nodes.RootNode;
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30 import org.junit.Assert;
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31 import org.junit.Test;
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33 /**
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34 * <h3>Creating a Root Node</h3>
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35 *
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36 * <p>
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37 * A Truffle root node is the entry point into a Truffle tree that represents a guest language
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38 * method. It contains a {@link RootNode#execute(VirtualFrame)} method that can return a
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39 * {@link java.lang.Object} value as the result of the guest language method invocation. This method
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40 * must however never be called directly. Instead, the Truffle runtime must be used to create a
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41 * {@link CallTarget} object from a root node using the
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42 * {@link TruffleRuntime#createCallTarget(RootNode)} method. This call target object can then be
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43 * executed using the {@link CallTarget#call(Object...)} method or one of its overloads.
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44 * </p>
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45 *
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46 * <p>
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47 * The next part of the Truffle API introduction is at
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48 * {@link com.oracle.truffle.api.test.ChildNodeTest}.
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49 * </p>
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50 */
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51 public class RootNodeTest {
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52
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53 @Test
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54 public void test() {
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55 TruffleRuntime runtime = Truffle.getRuntime();
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56 TestRootNode rootNode = new TestRootNode();
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57 CallTarget target = runtime.createCallTarget(rootNode);
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58 Object result = target.call();
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59 Assert.assertEquals(42, result);
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60 }
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62 class TestRootNode extends RootNode {
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63
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64 public TestRootNode() {
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65 super(TestingLanguage.class, null, null);
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66 }
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67
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68 @Override
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69 public Object execute(VirtualFrame frame) {
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70 return 42;
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71 }
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72 }
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73 }