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Frame API: Introduce FrameSlotKind.
author Andreas Woess <andreas.woess@jku.at>
date Thu, 25 Apr 2013 18:14:08 +0200
parents 07f8d136a05e
children df1d665ca846
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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
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
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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 * <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
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36 * be used for storing the values of local variables of the guest language. The
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37 * {@link FrameDescriptor} represents the current structure of the frame. The method
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38 * {@link FrameDescriptor#addFrameSlot(Object, FrameSlotKind)} can be used to create predefined
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39 * frame slots. The setter and getter methods in the {@link Frame} class can be used to access the
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40 * current value of a particular frame slot.
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41 * </p>
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42 *
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43 * <p>
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44 * There are five primitive types for slots available: {@link java.lang.Boolean},
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45 * {@link java.lang.Integer}, {@link java.lang.Long}, {@link java.lang.Float}, and
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46 * {@link java.lang.Double} . It is encouraged to use those types whenever possible. Dynamically
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47 * typed languages can speculate on the type of a value fitting into a primitive (see
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48 * {@link FrameSlotTypeSpecializationTest}). When a frame slot is of one of those particular
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49 * primitive types, its value may only be accessed with the respectively typed getter method (
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50 * {@link Frame#getBoolean}, {@link Frame#getInt}, {@link Frame#getLong}, {@link Frame#getFloat}, or
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51 * {@link Frame#getDouble}) or setter method ({@link Frame#setBoolean}, {@link Frame#setInt},
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52 * {@link Frame#setLong}, {@link Frame#setFloat}, or {@link Frame#setDouble}) in the {@link Frame}
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53 * class.
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54 * </p>
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55 *
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56 * <p>
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57 * The next part of the Truffle API introduction is at
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58 * {@link com.oracle.truffle.api.test.FrameSlotTypeSpecializationTest}.
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59 * </p>
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60 */
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61 public class FrameTest {
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62
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63 @Test
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64 public void test() {
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65 TruffleRuntime runtime = Truffle.getRuntime();
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66 FrameDescriptor frameDescriptor = new FrameDescriptor();
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67 FrameSlot slot = frameDescriptor.addFrameSlot("localVar", FrameSlotKind.Int);
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68 TestRootNode rootNode = new TestRootNode(new AssignLocal(slot), new ReadLocal(slot));
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69 CallTarget target = runtime.createCallTarget(rootNode, frameDescriptor);
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70 Object result = target.call();
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71 Assert.assertEquals(42, result);
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72 }
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74 class TestRootNode extends RootNode {
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76 @Child TestChildNode left;
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77 @Child TestChildNode right;
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78
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79 public TestRootNode(TestChildNode left, TestChildNode right) {
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80 this.left = adoptChild(left);
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81 this.right = adoptChild(right);
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82 }
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84 @Override
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85 public Object execute(VirtualFrame frame) {
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86 return left.execute(frame) + right.execute(frame);
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87 }
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88 }
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90 abstract class TestChildNode extends Node {
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91
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92 abstract int execute(VirtualFrame frame);
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93 }
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94
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95 abstract class FrameSlotNode extends TestChildNode {
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96
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97 protected final FrameSlot slot;
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98
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99 public FrameSlotNode(FrameSlot slot) {
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100 this.slot = slot;
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101 }
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102 }
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104 class AssignLocal extends FrameSlotNode {
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105
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106 AssignLocal(FrameSlot slot) {
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107 super(slot);
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108 }
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110 @Override
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111 int execute(VirtualFrame frame) {
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112 try {
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113 frame.setInt(slot, 42);
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114 } catch (FrameSlotTypeException e) {
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115 throw new IllegalStateException(e);
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116 }
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117 return 0;
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118 }
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119 }
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121 class ReadLocal extends FrameSlotNode {
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122
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123 ReadLocal(FrameSlot slot) {
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124 super(slot);
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125 }
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126
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127 @Override
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128 int execute(VirtualFrame frame) {
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129 try {
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130 return frame.getInt(slot);
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131 } catch (FrameSlotTypeException e) {
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132 throw new IllegalStateException(e);
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133 }
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134 }
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135 }
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136 }