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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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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.
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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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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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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
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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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
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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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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30
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31 /**
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32 * <h3>Storing Values in Frame Slots</h3>
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33 *
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34 * <p>
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35 * The frame is the preferred data structure for passing values between nodes. It can in particular be used for storing
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36 * the values of local variables of the guest language. The {@link FrameDescriptor} represents the current structure of
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37 * the frame. The method {@link FrameDescriptor#addFrameSlot(String, Class)} can be used to create predefined frame
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38 * slots. The setter and getter methods in the {@link Frame} class can be used to access the current value of a
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39 * particular frame slot.
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40 * </p>
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41 *
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42 * <p>
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43 * There are five primitive types for slots available: {@link java.lang.Boolean}, @{link java.lang.Integer},
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44 * {@link java.lang.Long}, {@link java.lang.Float}, and {@link java.lang.Double}. It is encouraged to use those types
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45 * whenever possible. Dynamically typed languages can speculate on the type of a value fitting into a primitive (see
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46 * {@link FrameSlotTypeSpecializationTest}). When a frame slot is of one of those particular primitive types, its value
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47 * may only be accessed with the repectively typed getter method ({@link Frame#getBoolean}, {@link Frame#getInt},
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48 * {@link Frame#getLong}, {@link Frame#getFloat}, or {@link Frame#getDouble}) or setter method ({@link Frame#setBoolean},
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49 * {@link Frame#setInt}, {@link Frame#setLong}, {@link Frame#setFloat}, or {@link Frame#setDouble}) in the
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50 * {@link Frame} class.
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51 * </p>
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52 *
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53 * <p>
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54 * The next part of the Truffle API introduction is at
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55 * {@link com.oracle.truffle.api.test.FrameSlotTypeSpecializationTest}.
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56 * </p>
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57 */
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58 public class FrameTest {
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59
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60 @Test
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61 public void test() {
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62 TruffleRuntime runtime = Truffle.getRuntime();
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63 FrameDescriptor frameDescriptor = new FrameDescriptor();
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64 FrameSlot slot = frameDescriptor.addFrameSlot("localVar", Integer.class);
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65 TestRootNode rootNode = new TestRootNode(new AssignLocal(slot), new ReadLocal(slot));
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66 CallTarget target = runtime.createCallTarget(rootNode, frameDescriptor);
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67 Object result = target.call();
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68 Assert.assertEquals(42, result);
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69 }
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71 class TestRootNode extends RootNode {
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73 @Child TestChildNode left;
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74 @Child TestChildNode right;
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75
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76 public TestRootNode(TestChildNode left, TestChildNode right) {
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77 this.left = adoptChild(left);
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78 this.right = adoptChild(right);
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79 }
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80
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81 @Override
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82 public Object execute(VirtualFrame frame) {
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83 return left.execute(frame) + right.execute(frame);
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84 }
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85 }
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86
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87 abstract class TestChildNode extends Node {
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88 abstract int execute(VirtualFrame frame);
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89 }
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90
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91 abstract class FrameSlotNode extends TestChildNode {
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92 protected final FrameSlot slot;
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93
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94 public FrameSlotNode(FrameSlot slot) {
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95 this.slot = slot;
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96 }
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97 }
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98
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99 class AssignLocal extends FrameSlotNode {
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100 AssignLocal(FrameSlot slot) {
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101 super(slot);
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102 }
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103
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104 @Override
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105 int execute(VirtualFrame frame) {
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106 frame.setInt(slot, 42);
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107 return 0;
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108 }
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109 }
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110
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111 class ReadLocal extends FrameSlotNode {
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112 ReadLocal(FrameSlot slot) {
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113 super(slot);
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114 }
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115
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116 @Override
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117 int execute(VirtualFrame frame) {
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118 return frame.getInt(slot);
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119 }
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120 }
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121 }
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122