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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.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Tue, 18 Dec 2012 15:33:55 +0100
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children 5e3d1a68664e
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7267
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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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
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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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
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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12 * version 2 for more details (a copy is included in the LICENSE file that
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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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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26
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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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30
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31
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32 /**
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33 * <h3>Passing Arguments</h3>
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34 *
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35 * <p>
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36 * A guest language can pass its own custom arguments when invoking a Truffle method by creating a subclass of
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37 * {@link Arguments}. When invoking a call target with {@link CallTarget#call(Arguments)}, the arguments can be passed.
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38 * A Truffle node can access the 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 Truffle runtime to improve
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43 * optimizations around guest language method calls. Also, the arguments object must never be stored into a field. It
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44 * should be created immediately before invoking {@link CallTarget#call(Arguments)} and no longer be accessed
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45 * 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 * </p>
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51 */
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52 public class ArgumentsTest {
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53
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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 TestArgumentNode[]{new TestArgumentNode(0), new TestArgumentNode(1)});
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58 CallTarget target = runtime.createCallTarget(rootNode);
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59 Object result = target.call(new TestArguments(20, 22));
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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 TestArguments extends Arguments {
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64 final int[] values;
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65 TestArguments(int... values) {
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66 this.values = values;
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67 }
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68 }
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70 class TestRootNode extends RootNode {
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72 @Children private TestArgumentNode[] children;
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74 TestRootNode(TestArgumentNode[] children) {
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75 this.children = adoptChildren(children);
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76 }
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77
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78 @Override
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79 public Object execute(VirtualFrame frame) {
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80 int sum = 0;
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81 for (int i = 0; i < children.length; ++i) {
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82 sum += children[i].execute(frame);
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83 }
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84 return sum;
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85 }
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86 }
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87
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88 class TestArgumentNode extends Node {
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89 private final int index;
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91 TestArgumentNode(int index) {
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92 this.index = index;
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93 }
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95 int execute(VirtualFrame frame) {
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96 return ((TestArguments) frame.getArguments()).values[index];
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97 }
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98 }
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99 }
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100