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Truffle: Change CallTarget from an abstract class to an interface. Allow varargs.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Tue, 15 Apr 2014 13:26:26 +0200
parents df1d665ca846
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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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24
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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>Creating a Root Node</h3>
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33 *
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34 * <p>
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35 * A Truffle root node is the entry point into a Truffle tree that represents a guest language
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36 * method. It contains a {@link RootNode#execute(VirtualFrame)} method that can return a
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37 * {@link java.lang.Object} value as the result of the guest language method invocation. This method
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38 * must however never be called directly. Instead, the Truffle runtime must be used to create a
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39 * {@link CallTarget} object from a root node using the
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40 * {@link TruffleRuntime#createCallTarget(RootNode)} method. This call target object can then be
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41 * executed using the {@link CallTarget#call(Object...)} method or one of its overloads.
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42 * </p>
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43 *
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44 * <p>
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45 * The next part of the Truffle API introduction is at
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46 * {@link com.oracle.truffle.api.test.ChildNodeTest}.
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47 * </p>
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48 */
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49 public class RootNodeTest {
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51 @Test
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52 public void test() {
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53 TruffleRuntime runtime = Truffle.getRuntime();
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54 TestRootNode rootNode = new TestRootNode();
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55 CallTarget target = runtime.createCallTarget(rootNode);
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56 Object result = target.call();
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57 Assert.assertEquals(42, result);
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58 }
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60 class TestRootNode extends RootNode {
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61
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62 public TestRootNode() {
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63 super(null);
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64 }
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65
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66 @Override
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67 public Object execute(VirtualFrame frame) {
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68 return 42;
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69 }
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70 }
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71 }