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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameDescriptor.java @ 12644:e122dc0436be

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convert FrameSlot interface to a final class.
author Andreas Woess <andreas.woess@jku.at>
date Wed, 30 Oct 2013 19:05:29 +0100
parents 91a676d0bbbe
children 042a2d972174
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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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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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89 public int getSize() {
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90 return slots.size();
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91 }
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92
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93 public List<? extends FrameSlot> getSlots() {
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94 return Collections.unmodifiableList(slots);
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95 }
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96
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97 /**
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98 * Retrieve the list of all the identifiers associated with this frame descriptor.
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99 *
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100 * @return the list of all the identifiers in this frame descriptor
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101 */
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102 public Set<Object> getIdentifiers() {
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103 return Collections.unmodifiableSet(identifierToSlotMap.keySet());
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104 }
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105
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106 public FrameDescriptor copy() {
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107 FrameDescriptor clonedFrameDescriptor = new FrameDescriptor(this.typeConversion);
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108 for (int i = 0; i < this.getSlots().size(); i++) {
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109 Object identifier = this.getSlots().get(i).getIdentifier();
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110 clonedFrameDescriptor.addFrameSlot(identifier);
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111 }
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112 return clonedFrameDescriptor;
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113 }
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114
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115 public FrameDescriptor shallowCopy() {
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116 FrameDescriptor clonedFrameDescriptor = new FrameDescriptor(this.typeConversion);
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117 clonedFrameDescriptor.slots.addAll(slots);
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118 clonedFrameDescriptor.identifierToSlotMap.putAll(identifierToSlotMap);
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119 return clonedFrameDescriptor;
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120 }
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121
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122 void updateVersion() {
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123 version.invalidate();
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124 version = createVersion();
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125 }
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126
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127 public Assumption getVersion() {
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128 return version;
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129 }
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130
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131 private static Assumption createVersion() {
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132 return Truffle.getRuntime().createAssumption("frame version");
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133 }
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134
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135 public FrameTypeConversion getTypeConversion() {
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136 return typeConversion;
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137 }
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138
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139 public Assumption getNotInFrameAssumption(Object identifier) {
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140 if (identifierToSlotMap.containsKey(identifier)) {
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141 throw new IllegalArgumentException("Cannot get not-in-frame assumption for existing frame slot!");
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142 }
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143
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144 if (identifierToNotInFrameAssumptionMap == null) {
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145 identifierToNotInFrameAssumptionMap = new HashMap<>();
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146 } else {
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147 Assumption assumption = identifierToNotInFrameAssumptionMap.get(identifier);
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148 if (assumption != null) {
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149 return assumption;
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150 }
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151 }
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152 Assumption assumption = Truffle.getRuntime().createAssumption("not in frame: " + identifier);
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153 identifierToNotInFrameAssumptionMap.put(identifier, assumption);
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154 return assumption;
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155 }
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156
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157 private void invalidateNotInFrameAssumption(Object identifier) {
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158 if (identifierToNotInFrameAssumptionMap != null) {
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159 Assumption assumption = identifierToNotInFrameAssumptionMap.get(identifier);
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160 if (assumption != null) {
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161 assumption.invalidate();
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162 identifierToNotInFrameAssumptionMap.remove(identifier);
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163 }
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164 }
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165 }
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166 }