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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameDescriptor.java @ 13875:042a2d972174

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support frame slot removal
author Michael Haupt <michael.haupt@oracle.com>
date Wed, 05 Feb 2014 11:40:13 +0100
parents e122dc0436be
children da9b9b625818
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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
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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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27 import java.util.*;
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28
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29 import com.oracle.truffle.api.*;
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30 import com.oracle.truffle.api.impl.*;
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31
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32 /**
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33 * Descriptor of the slots of frame objects. Multiple frame instances are associated with one such
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34 * descriptor.
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35 */
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36 public final class FrameDescriptor implements Cloneable {
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37
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38 private final FrameTypeConversion typeConversion;
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39 private final ArrayList<FrameSlot> slots;
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40 private final HashMap<Object, FrameSlot> identifierToSlotMap;
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41 private Assumption version;
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42 private HashMap<Object, Assumption> identifierToNotInFrameAssumptionMap;
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44 public FrameDescriptor() {
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45 this(DefaultFrameTypeConversion.getInstance());
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46 }
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47
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48 public FrameDescriptor(FrameTypeConversion typeConversion) {
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49 this.typeConversion = typeConversion;
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50 slots = new ArrayList<>();
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51 identifierToSlotMap = new HashMap<>();
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52 version = createVersion();
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53 }
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54
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55 public FrameSlot addFrameSlot(Object identifier) {
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56 return addFrameSlot(identifier, FrameSlotKind.Illegal);
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57 }
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58
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59 public FrameSlot addFrameSlot(Object identifier, FrameSlotKind kind) {
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60 assert !identifierToSlotMap.containsKey(identifier);
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61 FrameSlot slot = new FrameSlot(this, identifier, slots.size(), kind);
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62 slots.add(slot);
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63 identifierToSlotMap.put(identifier, slot);
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64 updateVersion();
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65 invalidateNotInFrameAssumption(identifier);
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66 return slot;
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67 }
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68
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69 public FrameSlot findFrameSlot(Object identifier) {
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70 return identifierToSlotMap.get(identifier);
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71 }
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72
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73 public FrameSlot findOrAddFrameSlot(Object identifier) {
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74 FrameSlot result = findFrameSlot(identifier);
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75 if (result != null) {
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76 return result;
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77 }
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78 return addFrameSlot(identifier);
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79 }
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80
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81 public FrameSlot findOrAddFrameSlot(Object identifier, FrameSlotKind kind) {
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82 FrameSlot result = findFrameSlot(identifier);
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83 if (result != null) {
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84 return result;
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85 }
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86 return addFrameSlot(identifier, kind);
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87 }
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88
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89 public void removeFrameSlot(Object identifier) {
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90 assert identifierToSlotMap.containsKey(identifier);
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91 slots.remove(identifierToSlotMap.get(identifier));
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92 identifierToSlotMap.remove(identifier);
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93 updateVersion();
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94 getNotInFrameAssumption(identifier);
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95 }
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96
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97 public int getSize() {
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98 return slots.size();
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99 }
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100
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101 public List<? extends FrameSlot> getSlots() {
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102 return Collections.unmodifiableList(slots);
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103 }
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104
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105 /**
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106 * Retrieve the list of all the identifiers associated with this frame descriptor.
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107 *
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108 * @return the list of all the identifiers in this frame descriptor
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109 */
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110 public Set<Object> getIdentifiers() {
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111 return Collections.unmodifiableSet(identifierToSlotMap.keySet());
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112 }
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113
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114 public FrameDescriptor copy() {
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115 FrameDescriptor clonedFrameDescriptor = new FrameDescriptor(this.typeConversion);
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116 for (int i = 0; i < this.getSlots().size(); i++) {
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117 Object identifier = this.getSlots().get(i).getIdentifier();
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118 clonedFrameDescriptor.addFrameSlot(identifier);
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119 }
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120 return clonedFrameDescriptor;
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121 }
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122
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123 public FrameDescriptor shallowCopy() {
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124 FrameDescriptor clonedFrameDescriptor = new FrameDescriptor(this.typeConversion);
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125 clonedFrameDescriptor.slots.addAll(slots);
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126 clonedFrameDescriptor.identifierToSlotMap.putAll(identifierToSlotMap);
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127 return clonedFrameDescriptor;
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128 }
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129
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130 void updateVersion() {
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131 version.invalidate();
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132 version = createVersion();
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133 }
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134
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135 public Assumption getVersion() {
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136 return version;
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137 }
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138
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139 private static Assumption createVersion() {
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140 return Truffle.getRuntime().createAssumption("frame version");
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141 }
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142
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143 public FrameTypeConversion getTypeConversion() {
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144 return typeConversion;
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145 }
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146
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147 public Assumption getNotInFrameAssumption(Object identifier) {
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148 if (identifierToSlotMap.containsKey(identifier)) {
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149 throw new IllegalArgumentException("Cannot get not-in-frame assumption for existing frame slot!");
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150 }
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151
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152 if (identifierToNotInFrameAssumptionMap == null) {
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153 identifierToNotInFrameAssumptionMap = new HashMap<>();
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154 } else {
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155 Assumption assumption = identifierToNotInFrameAssumptionMap.get(identifier);
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156 if (assumption != null) {
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157 return assumption;
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158 }
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159 }
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160 Assumption assumption = Truffle.getRuntime().createAssumption("not in frame: " + identifier);
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161 identifierToNotInFrameAssumptionMap.put(identifier, assumption);
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162 return assumption;
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163 }
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164
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165 private void invalidateNotInFrameAssumption(Object identifier) {
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166 if (identifierToNotInFrameAssumptionMap != null) {
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167 Assumption assumption = identifierToNotInFrameAssumptionMap.get(identifier);
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168 if (assumption != null) {
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169 assumption.invalidate();
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170 identifierToNotInFrameAssumptionMap.remove(identifier);
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171 }
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172 }
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173 }
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174 }