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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameDescriptor.java @ 7267:a4b84ba6dc2e

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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.
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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.frame;
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24
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25 import java.util.*;
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26
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27 /**
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28 * Descriptor of the slots of frame objects. Multiple frame instances are associated with one such descriptor.
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29 */
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30 public final class FrameDescriptor {
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31
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32 protected final TypeConversion typeConversion;
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33 private final ArrayList<FrameSlotImpl> slots;
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34 private FrameVersionImpl lastVersion;
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35 private final HashMap<String, FrameSlotImpl> nameToSlotMap;
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36
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37 public FrameDescriptor() {
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38 this(DefaultTypeConversion.getInstance());
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39 }
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40
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41 public FrameDescriptor(TypeConversion typeConversion) {
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42 this.typeConversion = typeConversion;
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43 slots = new ArrayList<>();
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44 nameToSlotMap = new HashMap<>();
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45 lastVersion = new FrameVersionImpl();
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46 }
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47
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48 public FrameSlot addFrameSlot(String name) {
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49 return addFrameSlot(name, typeConversion.getTopType());
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50 }
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52 public FrameSlot addFrameSlot(String name, Class<?> type) {
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53 assert !nameToSlotMap.containsKey(name);
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54 FrameSlotImpl slot = new FrameSlotImpl(this, name, slots.size(), type);
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55 slots.add(slot);
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56 nameToSlotMap.put(name, slot);
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57 return slot;
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58 }
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60 public FrameSlot findFrameSlot(String name) {
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61 return nameToSlotMap.get(name);
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62 }
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64 public FrameSlot findOrAddFrameSlot(String name) {
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65 FrameSlot result = findFrameSlot(name);
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66 if (result != null) {
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67 return result;
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68 }
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69 return addFrameSlot(name);
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70 }
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72 public FrameVersion getCurrentVersion() {
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73 return lastVersion;
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74 }
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76 public int getSize() {
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77 return slots.size();
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78 }
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79
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80 public List< ? extends FrameSlot> getSlots() {
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81 return Collections.unmodifiableList(slots);
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82 }
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83
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84 protected void appendVersion(FrameVersionImpl newVersion) {
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85 lastVersion.next = newVersion;
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86 lastVersion = newVersion;
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87 }
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88 }
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89
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90 class FrameVersionImpl implements FrameVersion {
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91
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92 protected FrameVersionImpl next;
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93
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94 @Override
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95 public final FrameVersion getNext() {
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96 return next;
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97 }
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98 }
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99
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100 class TypeChangeFrameVersionImpl extends FrameVersionImpl implements FrameVersion.TypeChange {
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101
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102 private final FrameSlotImpl slot;
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103 private final Class< ? > oldType;
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104 private final Class< ? > newType;
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105
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106 protected TypeChangeFrameVersionImpl(FrameSlotImpl slot, Class< ? > oldType, Class< ? > newType) {
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107 this.slot = slot;
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108 this.oldType = oldType;
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109 this.newType = newType;
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110 }
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111
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112 @Override
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113 public final void applyTransformation(Frame frame) {
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114 Object value = slot.getValue(oldType, frame);
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115 slot.setValue(newType, frame, value);
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116 }
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117 }
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118
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119 class FrameSlotImpl implements FrameSlot {
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120
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121 private final FrameDescriptor descriptor;
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122 private final String name;
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123 private final int index;
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124 private Class< ? > type;
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125 private ArrayList<FrameSlotTypeListener> listeners;
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126
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127 protected FrameSlotImpl(FrameDescriptor descriptor, String name, int index, Class< ? > type) {
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128 this.descriptor = descriptor;
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129 this.name = name;
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130 this.index = index;
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131 this.type = type;
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132 assert type != null;
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133 }
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134
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135 public String getName() {
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136 return name;
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137 }
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138
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139 public int getIndex() {
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140 return index;
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141 }
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142
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143 public Class< ? > getType() {
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144 return type;
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145 }
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146
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147 protected Object getValue(Class< ? > accessType, Frame frame) {
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148 if (accessType == Integer.class) {
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149 return frame.getInt(this);
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150 } else if (accessType == Long.class) {
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151 return frame.getLong(this);
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152 } else if (accessType == Float.class) {
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153 return frame.getFloat(this);
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154 } else if (accessType == Double.class) {
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155 return frame.getDouble(this);
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156 } else {
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157 return frame.getObject(this);
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158 }
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159 }
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160
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161 protected void setValue(Class< ? > accessType, Frame frame, Object value) {
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162 Object newValue = descriptor.typeConversion.convertTo(accessType, value);
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163 if (accessType == Integer.class) {
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164 frame.setInt(this, (Integer) newValue);
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165 } else if (accessType == Long.class) {
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166 frame.setLong(this, (Long) newValue);
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167 } else if (accessType == Float.class) {
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168 frame.setFloat(this, (Float) newValue);
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169 } else if (accessType == Double.class) {
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170 frame.setDouble(this, (Double) newValue);
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171 } else {
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172 frame.setObject(this, newValue);
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173 }
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174 }
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175
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176 public void setType(final Class< ? > type) {
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177 final Class< ? > oldType = this.type;
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178 this.type = type;
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179 ArrayList<FrameSlotTypeListener> oldListeners = this.listeners;
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180 this.listeners = null;
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181 if (oldListeners != null) {
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182 for (FrameSlotTypeListener listener : oldListeners) {
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183 listener.typeChanged(this, oldType);
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184 }
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185 }
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186 descriptor.appendVersion(new TypeChangeFrameVersionImpl(this, oldType, type));
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187 }
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188
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189 @Override
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190 public String toString() {
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191 return "[" + index + "," + name + "]";
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192 }
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193
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194 @Override
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195 public void registerOneShotTypeListener(FrameSlotTypeListener listener) {
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196 if (listeners == null) {
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197 listeners = new ArrayList<>();
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198 }
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199 listeners.add(listener);
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200 }
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201 }