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annotate graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/access/SLWritePropertyCacheNode.java @ 21554:b1530a6cce8c

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renamed com.oracle.graal.[debug|options|hotspotvmconfig]* modules to com.oracle.jvmci.[debug|options|hotspotvmconfig]* modules (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Tue, 26 May 2015 23:21:15 +0200
parents f7bc60c3a8f6
children
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1 /*
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2 * Copyright (c) 2013, 2015, 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.sl.nodes.access;
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24
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25 import com.oracle.truffle.api.*;
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26 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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27 import com.oracle.truffle.api.dsl.*;
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28 import com.oracle.truffle.api.nodes.*;
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29 import com.oracle.truffle.api.object.*;
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30
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31 public abstract class SLWritePropertyCacheNode extends Node {
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32
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33 protected final String propertyName;
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34
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35 public SLWritePropertyCacheNode(String propertyName) {
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36 this.propertyName = propertyName;
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37 }
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38
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39 public abstract void executeObject(DynamicObject receiver, Object value);
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40
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41 @Specialization(guards = "location.isValid(receiver, value)", assumptions = "location.getAssumptions()")
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42 public void writeCached(DynamicObject receiver, Object value, //
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43 @Cached("createCachedWrite(receiver, value)") CachedWriteLocation location) {
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44 if (location.writeUnchecked(receiver, value)) {
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45 // write successful
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46 } else {
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47 executeObject(receiver, value);
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48 }
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49 }
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50
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51 @Specialization(contains = "writeCached")
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52 @TruffleBoundary
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53 public void writeGeneric(DynamicObject receiver, Object value, //
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54 @Cached("new(createCachedWrite(receiver, value))") LRUCachedWriteLocation lru) {
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55 CachedWriteLocation location = lru.location;
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56 if (!location.isValid(receiver, value) || !location.areAssumptionsValid()) {
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57 location = createCachedWrite(receiver, value);
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58 lru.location = location;
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59 }
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60 if (location.writeUnchecked(receiver, value)) {
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61 // write successful
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62 } else {
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63 executeObject(receiver, value);
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64 }
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65 }
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66
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67 protected CachedWriteLocation createCachedWrite(DynamicObject receiver, Object value) {
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68 while (receiver.updateShape()) {
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69 // multiple shape updates might be needed.
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70 }
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71
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72 Shape oldShape = receiver.getShape();
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73 Shape newShape;
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74 Property property = oldShape.getProperty(propertyName);
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75
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76 if (property != null && property.getLocation().canSet(receiver, value)) {
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77 newShape = oldShape;
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78 } else {
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79 receiver.define(propertyName, value, 0);
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80 newShape = receiver.getShape();
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81 property = newShape.getProperty(propertyName);
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82 }
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83
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84 if (!oldShape.check(receiver)) {
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85 return createCachedWrite(receiver, value);
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86 }
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87
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88 return new CachedWriteLocation(oldShape, newShape, property.getLocation());
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89
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90 }
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91
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92 protected static final class CachedWriteLocation {
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93
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94 private final Shape oldShape;
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95 private final Shape newShape;
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96 private final Location location;
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97 private final Assumption validLocation = Truffle.getRuntime().createAssumption();
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98
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99 public CachedWriteLocation(Shape oldShape, Shape newShape, Location location) {
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100 this.oldShape = oldShape;
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101 this.newShape = newShape;
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102 this.location = location;
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103 }
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104
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105 public boolean areAssumptionsValid() {
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106 return validLocation.isValid() && oldShape.getValidAssumption().isValid() && newShape.getValidAssumption().isValid();
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107 }
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108
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109 public Assumption[] getAssumptions() {
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110 return new Assumption[]{oldShape.getValidAssumption(), newShape.getValidAssumption(), validLocation};
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111 }
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112
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113 public boolean isValid(DynamicObject receiver, Object value) {
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114 return oldShape.check(receiver) && location.canSet(receiver, value);
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115 }
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116
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117 public boolean writeUnchecked(DynamicObject receiver, Object value) {
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118 try {
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119 if (oldShape == newShape) {
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120 location.set(receiver, value, oldShape);
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121 } else {
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122 location.set(receiver, value, oldShape, newShape);
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123 }
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124 return true;
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125 } catch (IncompatibleLocationException | FinalLocationException e) {
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126 validLocation.invalidate();
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127 return false;
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128 }
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129 }
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130 }
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131
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132 protected static final class LRUCachedWriteLocation {
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133
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134 private CachedWriteLocation location;
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135
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136 public LRUCachedWriteLocation(CachedWriteLocation location) {
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137 this.location = location;
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138 }
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139
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140 }
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141
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142 }