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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultVirtualFrame.java @ 8567:645f216a00c4

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Minor bug fix in Truffle frame implementation.
author Andreas Woess <andreas.woess@jku.at>
date Thu, 28 Mar 2013 14:33:19 +0100
parents 1a2d258d481a
children 07f8d136a05e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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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.impl;
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25 import java.util.*;
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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
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30 public final class DefaultVirtualFrame implements VirtualFrame {
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32 private static final Object UNDEFINED_OBJECT = null;
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33 private static final Boolean UNDEFINED_BOOLEAN = false;
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34 private static final Integer UNDEFINED_INTEGER = 0;
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35 private static final Float UNDEFINED_FLOAT = 0.0f;
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36 private static final Long UNDEFINED_LONG = 0L;
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37 private static final Double UNDEFINED_DOUBLE = 0.0d;
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38
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39 private final FrameDescriptor descriptor;
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40 private final PackedFrame caller;
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41 private final Arguments arguments;
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42 private FrameVersion currentVersion;
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43 protected Object[] locals;
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44 protected Class[] tags;
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45
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46 public DefaultVirtualFrame(FrameDescriptor descriptor, PackedFrame caller, Arguments arguments) {
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47 this.descriptor = descriptor;
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48 this.caller = caller;
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49 this.arguments = arguments;
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50 this.currentVersion = descriptor.getCurrentVersion();
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51 this.locals = new Object[descriptor.getSize()];
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52 // The tags are only needed for assertion checking, so initialize the field only when
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53 // assertions are enabled
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54 assert (this.tags = new Class[descriptor.getSize()]) != null;
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55 }
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57 @Override
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58 public Arguments getArguments() {
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59 return arguments;
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60 }
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62 @Override
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63 public PackedFrame getCaller() {
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64 return caller;
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65 }
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67 @Override
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68 public PackedFrame pack() {
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69 return new DefaultPackedFrame(this);
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70 }
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72 @Override
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73 public MaterializedFrame materialize() {
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74 return new DefaultMaterializedFrame(this);
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75 }
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77 @Override
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78 public Object getObject(FrameSlot slot) {
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79 return get(slot, Object.class, UNDEFINED_OBJECT);
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80 }
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81
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82 @Override
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83 public void setObject(FrameSlot slot, Object value) {
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84 set(slot, Object.class, value);
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85 }
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86
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87 @Override
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88 public boolean getBoolean(FrameSlot slot) {
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89 return (Boolean) get(slot, Boolean.class, UNDEFINED_BOOLEAN);
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90 }
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91
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92 @Override
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93 public void setBoolean(FrameSlot slot, boolean value) {
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94 set(slot, Boolean.class, value);
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95 }
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96
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97 @Override
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98 public int getInt(FrameSlot slot) {
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99 return (Integer) get(slot, Integer.class, UNDEFINED_INTEGER);
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100 }
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101
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102 @Override
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103 public void setInt(FrameSlot slot, int value) {
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104 set(slot, Integer.class, value);
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105 }
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106
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107 @Override
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108 public long getLong(FrameSlot slot) {
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109 return (Long) get(slot, Long.class, UNDEFINED_LONG);
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110 }
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111
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112 @Override
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113 public void setLong(FrameSlot slot, long value) {
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114 set(slot, Long.class, value);
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115 }
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116
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117 @Override
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118 public float getFloat(FrameSlot slot) {
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119 return (Float) get(slot, Float.class, UNDEFINED_FLOAT);
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120 }
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121
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122 @Override
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123 public void setFloat(FrameSlot slot, float value) {
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124 set(slot, Float.class, value);
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125 }
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126
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127 @Override
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128 public double getDouble(FrameSlot slot) {
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129 return (Double) get(slot, Double.class, UNDEFINED_DOUBLE);
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130 }
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131
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132 @Override
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133 public void setDouble(FrameSlot slot, double value) {
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134 set(slot, Double.class, value);
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135 }
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136
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137 private Object get(FrameSlot slot, Class<?> accessType, Object defaultValue) {
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138 Object value = locals[slot.getIndex()];
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139 assert verifyGet(slot, accessType, value);
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140 if (value == null) {
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141 return defaultValue;
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142 } else {
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143 return value;
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144 }
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145 }
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146
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147 private boolean verifyGet(FrameSlot slot, Class<?> accessType, Object value) {
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148 assert descriptor.getSlots().get(slot.getIndex()) == slot;
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149 Class<?> tag = tags[slot.getIndex()];
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150 if (value == null) {
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151 assert tag == null || tag == Object.class;
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152 } else {
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153 assert tag == accessType : "Local variable " + slot + " was written with set" + tag.getSimpleName() + ", but is read with get" + accessType.getSimpleName();
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154 }
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155 return true;
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156 }
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157
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158 private void set(FrameSlot slot, Class<?> accessType, Object value) {
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159 assert verifySet(slot, accessType, value);
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160 locals[slot.getIndex()] = value;
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161 }
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162
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163 private boolean verifySet(FrameSlot slot, Class<?> accessType, Object value) {
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164 assert descriptor.getSlots().get(slot.getIndex()) == slot;
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165 tags[slot.getIndex()] = accessType;
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166 assert accessType.isAssignableFrom(slot.getType()) : "Local variable " + slot + ": " + accessType + " is not assignable from " + slot.getType();
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167 if (value == null) {
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168 assert accessType == Object.class;
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169 } else {
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170 assert slot.getType().isAssignableFrom(value.getClass()) : "Local variable " + slot + ": " + slot.getType() + " is not assignable from " + value.getClass();
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171 }
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172 return true;
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173 }
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174
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175 @Override
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176 public void updateToLatestVersion() {
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177 if (currentVersion.getNext() != null) {
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178 doUpdateToLatestVersion();
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179 }
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180 }
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181
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182 private void doUpdateToLatestVersion() {
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183 FrameVersion version = currentVersion;
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184 while (version.getNext() != null) {
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185 version = version.getNext();
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186 if (version instanceof FrameVersion.TypeChange) {
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187 ((FrameVersion.TypeChange) version).applyTransformation(this);
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188 } else if (version instanceof FrameVersion.Resize) {
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189 int newSize = ((FrameVersion.Resize) version).getNewSize();
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190 locals = Arrays.copyOf(locals, newSize);
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191 }
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192 }
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193 currentVersion = version;
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194 }
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195
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196 @Override
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197 public FrameDescriptor getFrameDescriptor() {
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198 return this.descriptor;
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199 }
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200 }