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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameDescriptor.java @ 22490:fa86f9f3848d

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change FrameDescriptor#copy to also copy info
author Andreas Woess <andreas.woess@oracle.com>
date Thu, 10 Dec 2015 18:51:41 +0100
parents dc2bfc816011
children a73f1d7a5a3e
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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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * 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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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.frame;
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26
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27 import com.oracle.truffle.api.Assumption;
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28 import com.oracle.truffle.api.CompilerAsserts;
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29 import com.oracle.truffle.api.Truffle;
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30 import java.util.ArrayList;
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31 import java.util.Collections;
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32 import java.util.HashMap;
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33 import java.util.List;
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34 import java.util.Set;
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35
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36 /**
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37 * Descriptor of the slots of frame objects. Multiple frame instances are associated with one such
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38 * descriptor.
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39 */
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40 public final class FrameDescriptor implements Cloneable {
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41
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42 private final Object defaultValue;
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43 private final ArrayList<FrameSlot> slots;
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44 private final HashMap<Object, FrameSlot> identifierToSlotMap;
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45 private Assumption version;
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46 private HashMap<Object, Assumption> identifierToNotInFrameAssumptionMap;
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47
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48 /**
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49 * Constructs empty descriptor. The {@link #getDefaultValue()} is <code>null</code>.
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50 */
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51 public FrameDescriptor() {
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52 this(null);
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53 }
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54
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55 /**
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56 * Constructs new descriptor with specified {@link #getDefaultValue()}.
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57 *
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58 * @param defaultValue to be returned from {@link #getDefaultValue()}
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59 */
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60 public FrameDescriptor(Object defaultValue) {
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61 CompilerAsserts.neverPartOfCompilation();
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62 this.defaultValue = defaultValue;
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63 slots = new ArrayList<>();
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64 identifierToSlotMap = new HashMap<>();
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65 version = createVersion();
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66 }
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67
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68 /**
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69 * Use {@link #FrameDescriptor()}.
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70 *
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71 * @return new instance of the descriptor
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72 * @deprecated
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73 */
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74 @Deprecated
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75 public static FrameDescriptor create() {
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76 return new FrameDescriptor();
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77 }
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78
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79 /**
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80 * Use {@link #FrameDescriptor(java.lang.Object) }.
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81 *
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82 * @return new instance of the descriptor
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83 * @deprecated
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84 */
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85 @Deprecated
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86 public static FrameDescriptor create(Object defaultValue) {
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87 return new FrameDescriptor(defaultValue);
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88 }
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89
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90 /**
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91 * Adds frame slot. Delegates to
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92 * {@link #addFrameSlot(java.lang.Object, java.lang.Object, com.oracle.truffle.api.frame.FrameSlotKind)
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93 * addFrameSlot}(identifier, <code>null</code>, {@link FrameSlotKind#Illegal}). This is slow
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94 * operation that switches to interpreter mode.
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95 *
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96 * @param identifier key for the slot
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97 * @return the newly created slot
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98 */
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99 public FrameSlot addFrameSlot(Object identifier) {
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100 return addFrameSlot(identifier, null, FrameSlotKind.Illegal);
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101 }
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102
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103 /**
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104 * Adds frame slot. Delegates to
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105 * {@link #addFrameSlot(java.lang.Object, java.lang.Object, com.oracle.truffle.api.frame.FrameSlotKind)
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106 * addFrameSlot}(identifier, <code>null</code>, <code>kind</code>). This is slow operation that
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107 * switches to interpreter mode.
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108 *
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109 * @param identifier key for the slot
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110 * @param kind the kind of the new slot
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111 * @return the newly created slot
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112 */
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113 public FrameSlot addFrameSlot(Object identifier, FrameSlotKind kind) {
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114 return addFrameSlot(identifier, null, kind);
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115 }
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116
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117 /**
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118 * Adds new frame slot to {@link #getSlots()} list. This is slow operation that switches to
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119 * interpreter mode.
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120 *
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121 * @param identifier key for the slot - it needs proper {@link #equals(java.lang.Object)} and
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122 * {@link Object#hashCode()} implementations
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123 * @param info additional {@link FrameSlot#getInfo() information for the slot}
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124 * @param kind the kind of the new slot
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125 * @return the newly created slot
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126 */
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127 public FrameSlot addFrameSlot(Object identifier, Object info, FrameSlotKind kind) {
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128 CompilerAsserts.neverPartOfCompilation("interpreter-only. includes hashmap operations.");
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129 assert !identifierToSlotMap.containsKey(identifier);
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130 FrameSlot slot = new FrameSlot(this, identifier, info, slots.size(), kind);
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131 slots.add(slot);
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132 identifierToSlotMap.put(identifier, slot);
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133 updateVersion();
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134 invalidateNotInFrameAssumption(identifier);
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135 return slot;
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136 }
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137
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138 /**
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139 * Finds an existing slot. This is slow operation.
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140 *
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141 * @param identifier the key of the slot to search for
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142 * @return the slot or <code>null</code>
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143 */
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144 public FrameSlot findFrameSlot(Object identifier) {
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145 CompilerAsserts.neverPartOfCompilation("interpreter-only. includes hashmap operations.");
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146 return identifierToSlotMap.get(identifier);
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147 }
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148
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149 /**
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150 * Finds an existing slot or creates new one. This is slow operation.
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151 *
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152 * @param identifier the key of the slot to search for
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153 * @return the slot
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154 */
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155 public FrameSlot findOrAddFrameSlot(Object identifier) {
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156 FrameSlot result = findFrameSlot(identifier);
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157 if (result != null) {
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158 return result;
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159 }
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160 return addFrameSlot(identifier);
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161 }
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162
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163 /**
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164 * Finds an existing slot or creates new one. This is slow operation.
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165 *
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166 * @param identifier the key of the slot to search for
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167 * @param kind the kind for the newly created slot
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168 * @return the found or newly created slot
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169 */
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170 public FrameSlot findOrAddFrameSlot(Object identifier, FrameSlotKind kind) {
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171 FrameSlot result = findFrameSlot(identifier);
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172 if (result != null) {
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173 return result;
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174 }
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175 return addFrameSlot(identifier, kind);
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176 }
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177
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178 /**
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179 * Finds an existing slot or creates new one. This is slow operation.
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180 *
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181 * @param identifier the key of the slot to search for
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182 * @param info info for the newly created slot
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183 * @param kind the kind for the newly created slot
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184 * @return the found or newly created slot
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185 */
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186 public FrameSlot findOrAddFrameSlot(Object identifier, Object info, FrameSlotKind kind) {
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187 FrameSlot result = findFrameSlot(identifier);
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188 if (result != null) {
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189 return result;
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190 }
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191 return addFrameSlot(identifier, info, kind);
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192 }
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193
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194 /**
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195 * Removes a slot. If the identifier is found, its slot is removed from this descriptor. This is
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196 * slow operation.
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197 *
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198 * @param identifier identifies the slot to remove
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199 */
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200 public void removeFrameSlot(Object identifier) {
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201 CompilerAsserts.neverPartOfCompilation("interpreter-only. includes hashmap operations.");
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202 assert identifierToSlotMap.containsKey(identifier);
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203 slots.remove(identifierToSlotMap.get(identifier));
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204 identifierToSlotMap.remove(identifier);
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205 updateVersion();
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206 getNotInFrameAssumption(identifier);
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207 }
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208
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209 /**
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210 * Returns number of slots in the descriptor.
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211 *
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212 * @return the same value as {@link #getSlots()}.{@link List#size()} would return
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213 */
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214 public int getSize() {
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215 return slots.size();
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216 }
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217
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218 /**
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219 * Current set of slots in the descriptor.
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220 *
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221 * @return unmodifiable list of {@link FrameSlot}
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222 */
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223 public List<? extends FrameSlot> getSlots() {
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224 return Collections.unmodifiableList(slots);
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225 }
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226
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227 /**
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228 * Retrieve the list of all the identifiers associated with this frame descriptor.
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229 *
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230 * @return the list of all the identifiers in this frame descriptor
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231 */
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232 public Set<Object> getIdentifiers() {
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233 return Collections.unmodifiableSet(identifierToSlotMap.keySet());
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234 }
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235
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236 /**
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237 * Deeper copy of the descriptor. Copies all slots in the descriptor, but only their
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238 * {@linkplain FrameSlot#getIdentifier() identifier} and {@linkplain FrameSlot#getInfo() info}
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239 * but not their {@linkplain FrameSlot#getKind() kind}!
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240 *
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241 * @return new instance of a descriptor with copies of values from this one
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242 */
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243 public FrameDescriptor copy() {
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244 FrameDescriptor clonedFrameDescriptor = new FrameDescriptor(this.defaultValue);
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245 for (int i = 0; i < slots.size(); i++) {
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246 FrameSlot slot = slots.get(i);
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247 clonedFrameDescriptor.addFrameSlot(slot.getIdentifier(), slot.getInfo(), FrameSlotKind.Illegal);
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248 }
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249 return clonedFrameDescriptor;
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250 }
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251
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252 /**
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253 * Shallow copy of the descriptor. Re-uses the existing slots in new descriptor. As a result, if
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254 * you {@link FrameSlot#setKind(com.oracle.truffle.api.frame.FrameSlotKind) change kind} of one
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255 * of the slots it is changed in the original as well as in the shallow copy.
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256 *
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257 * @return new instance of a descriptor with copies of values from this one
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258 */
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259 public FrameDescriptor shallowCopy() {
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260 FrameDescriptor clonedFrameDescriptor = new FrameDescriptor(this.defaultValue);
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261 clonedFrameDescriptor.slots.addAll(slots);
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262 clonedFrameDescriptor.identifierToSlotMap.putAll(identifierToSlotMap);
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263 return clonedFrameDescriptor;
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264 }
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265
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266 void updateVersion() {
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267 version.invalidate();
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268 version = createVersion();
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269 }
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270
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271 public Assumption getVersion() {
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272 return version;
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273 }
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274
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275 private static Assumption createVersion() {
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276 return Truffle.getRuntime().createAssumption("frame version");
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277 }
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278
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279 /**
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280 * Default value for the created slots.
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281 *
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282 * @return value provided to {@link #FrameDescriptor(java.lang.Object)}
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283 */
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284 public Object getDefaultValue() {
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285 return defaultValue;
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286 }
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287
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288 public Assumption getNotInFrameAssumption(Object identifier) {
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289 if (identifierToSlotMap.containsKey(identifier)) {
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290 throw new IllegalArgumentException("Cannot get not-in-frame assumption for existing frame slot!");
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291 }
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292
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293 if (identifierToNotInFrameAssumptionMap == null) {
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294 identifierToNotInFrameAssumptionMap = new HashMap<>();
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295 } else {
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296 Assumption assumption = identifierToNotInFrameAssumptionMap.get(identifier);
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297 if (assumption != null) {
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298 return assumption;
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299 }
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300 }
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301 Assumption assumption = Truffle.getRuntime().createAssumption("not in frame: " + identifier);
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302 identifierToNotInFrameAssumptionMap.put(identifier, assumption);
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303 return assumption;
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304 }
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305
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306 private void invalidateNotInFrameAssumption(Object identifier) {
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307 if (identifierToNotInFrameAssumptionMap != null) {
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308 Assumption assumption = identifierToNotInFrameAssumptionMap.get(identifier);
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309 if (assumption != null) {
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310 assumption.invalidate();
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311 identifierToNotInFrameAssumptionMap.remove(identifier);
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312 }
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313 }
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314 }
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315
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316 @Override
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317 public String toString() {
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318 StringBuilder sb = new StringBuilder();
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319 sb.append("FrameDescriptor@").append(Integer.toHexString(hashCode()));
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320 sb.append("{");
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321 boolean comma = false;
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322 for (FrameSlot slot : slots) {
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323 if (comma) {
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324 sb.append(", ");
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325 } else {
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326 comma = true;
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327 }
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328 sb.append(slot.getIndex()).append(":").append(slot.getIdentifier());
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329 }
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330 sb.append("}");
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331 return sb.toString();
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332 }
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333 }