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annotate truffle/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/FrameTest.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 7804ee711b7d 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.Frame;
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29 import com.oracle.truffle.api.frame.FrameDescriptor;
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30 import com.oracle.truffle.api.frame.FrameSlot;
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31 import com.oracle.truffle.api.frame.FrameSlotKind;
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32 import com.oracle.truffle.api.frame.FrameSlotTypeException;
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33 import com.oracle.truffle.api.frame.VirtualFrame;
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34 import com.oracle.truffle.api.nodes.Node;
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35 import com.oracle.truffle.api.nodes.RootNode;
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36 import org.junit.Assert;
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37 import org.junit.Test;
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38
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39 /**
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40 * <h3>Storing Values in Frame Slots</h3>
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41 *
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42 * <p>
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43 * The frame is the preferred data structure for passing values between nodes. It can in particular
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44 * be used for storing the values of local variables of the guest language. The
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45 * {@link FrameDescriptor} represents the current structure of the frame. The method
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46 * {@link FrameDescriptor#addFrameSlot(Object, FrameSlotKind)} can be used to create predefined
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47 * frame slots. The setter and getter methods in the {@link Frame} class can be used to access the
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48 * current value of a particular frame slot. Values can be removed from a frame via the
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49 * {@link FrameDescriptor#removeFrameSlot(Object)} method.
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50 * </p>
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51 *
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52 * <p>
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53 * There are five primitive types for slots available: {@link java.lang.Boolean},
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54 * {@link java.lang.Integer}, {@link java.lang.Long}, {@link java.lang.Float}, and
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55 * {@link java.lang.Double} . It is encouraged to use those types whenever possible. Dynamically
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56 * typed languages can speculate on the type of a value fitting into a primitive (see
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57 * {@link FrameSlotTypeSpecializationTest}). When a frame slot is of one of those particular
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58 * primitive types, its value may only be accessed with the respectively typed getter method (
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59 * {@link Frame#getBoolean}, {@link Frame#getInt}, {@link Frame#getLong}, {@link Frame#getFloat}, or
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60 * {@link Frame#getDouble}) or setter method ({@link Frame#setBoolean}, {@link Frame#setInt},
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61 * {@link Frame#setLong}, {@link Frame#setFloat}, or {@link Frame#setDouble}) in the {@link Frame}
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62 * class.
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63 * </p>
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64 *
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65 * <p>
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66 * The next part of the Truffle API introduction is at
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67 * {@link com.oracle.truffle.api.test.FrameSlotTypeSpecializationTest}.
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68 * </p>
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69 */
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70 public class FrameTest {
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71
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72 @Test
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73 public void test() {
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74 TruffleRuntime runtime = Truffle.getRuntime();
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75 FrameDescriptor frameDescriptor = new FrameDescriptor();
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76 String varName = "localVar";
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77 FrameSlot slot = frameDescriptor.addFrameSlot(varName, FrameSlotKind.Int);
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78 TestRootNode rootNode = new TestRootNode(frameDescriptor, new AssignLocal(slot), new ReadLocal(slot));
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79 CallTarget target = runtime.createCallTarget(rootNode);
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80 Object result = target.call();
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81 Assert.assertEquals(42, result);
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82 frameDescriptor.removeFrameSlot(varName);
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83 boolean slotMissing = false;
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84 try {
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85 result = target.call();
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86 } catch (IllegalArgumentException iae) {
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87 slotMissing = true;
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88 }
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89 Assert.assertTrue(slotMissing);
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90 }
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92 class TestRootNode extends RootNode {
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93
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94 @Child TestChildNode left;
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95 @Child TestChildNode right;
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96
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97 public TestRootNode(FrameDescriptor descriptor, TestChildNode left, TestChildNode right) {
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98 super(TestingLanguage.class, null, descriptor);
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99 this.left = left;
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100 this.right = right;
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101 }
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103 @Override
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104 public Object execute(VirtualFrame frame) {
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105 return left.execute(frame) + right.execute(frame);
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106 }
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107 }
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109 abstract class TestChildNode extends Node {
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110
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111 public TestChildNode() {
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112 super(null);
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113 }
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114
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115 abstract int execute(VirtualFrame frame);
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116 }
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117
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118 abstract class FrameSlotNode extends TestChildNode {
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119
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120 protected final FrameSlot slot;
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121
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122 public FrameSlotNode(FrameSlot slot) {
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123 this.slot = slot;
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124 }
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125 }
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127 class AssignLocal extends FrameSlotNode {
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128
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129 AssignLocal(FrameSlot slot) {
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130 super(slot);
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131 }
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133 @Override
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134 int execute(VirtualFrame frame) {
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135 frame.setInt(slot, 42);
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136 return 0;
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137 }
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138 }
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139
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140 class ReadLocal extends FrameSlotNode {
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141
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142 ReadLocal(FrameSlot slot) {
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143 super(slot);
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144 }
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146 @Override
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147 int execute(VirtualFrame frame) {
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148 try {
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149 return frame.getInt(slot);
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150 } catch (FrameSlotTypeException e) {
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151 throw new IllegalStateException(e);
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152 }
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153 }
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154 }
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155 }