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annotate truffle/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Layout.java @ 22325:414e82b9fc35

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Release 0.9 is out, let's remove deprecated elements from the API
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Fri, 23 Oct 2015 20:23:00 +0200
parents 8bc57c7bbf88
children bb3c03f2442d
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1 /*
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2 * Copyright (c) 2013, 2014, 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.object;
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26
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27 import java.util.EnumSet;
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28 import java.util.ServiceLoader;
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29
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30 import com.oracle.truffle.api.object.Shape.Allocator;
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31
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32 /**
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33 * Describes layout and behavior of a {@link DynamicObject} subclass and is used to create shapes.
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34 *
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35 * An object may change its shape but only to shapes of the same layout.
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36 */
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37 public abstract class Layout {
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38 public static final String OPTION_PREFIX = "truffle.object.";
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39
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40 private static final LayoutFactory LAYOUT_FACTORY = loadLayoutFactory();
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41
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42 /**
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43 * Specifies the allowed implicit casts between primitive types without losing type information.
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44 */
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45 public enum ImplicitCast {
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46 IntToDouble,
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47 IntToLong,
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48 }
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49
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50 /**
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51 * Creates a new {@link Builder}.
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52 */
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53 public static Builder newLayout() {
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54 return new Builder();
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55 }
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56
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57 /**
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58 * Equivalent to {@code Layout.newLayout().build()}.
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59 */
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60 public static Layout createLayout() {
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61 return newLayout().build();
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62 }
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63
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64 public abstract DynamicObject newInstance(Shape shape);
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65
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66 public abstract Class<? extends DynamicObject> getType();
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67
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68 public abstract Shape createShape(ObjectType operations);
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69
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70 public abstract Shape createShape(ObjectType operations, Object sharedData);
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71
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72 public abstract Shape createShape(ObjectType operations, Object sharedData, int id);
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73
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74 /**
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75 * Create an allocator for static property creation. Reserves all array extension slots.
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76 */
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77 public abstract Allocator createAllocator();
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78
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79 protected static LayoutFactory getFactory() {
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80 return LAYOUT_FACTORY;
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81 }
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82
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83 private static LayoutFactory loadLayoutFactory() {
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84 LayoutFactory bestLayoutFactory = null;
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85
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86 String layoutFactoryImplClassName = System.getProperty(OPTION_PREFIX + "LayoutFactory");
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87 if (layoutFactoryImplClassName != null) {
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88 Class<?> clazz;
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89 try {
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90 clazz = Class.forName(layoutFactoryImplClassName);
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91 } catch (ClassNotFoundException e) {
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92 throw new RuntimeException(e);
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93 }
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94 try {
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95 bestLayoutFactory = (LayoutFactory) clazz.newInstance();
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96 } catch (InstantiationException | IllegalAccessException e) {
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97 throw new AssertionError(e);
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98 }
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99 } else {
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100 ServiceLoader<LayoutFactory> serviceLoader = ServiceLoader.load(LayoutFactory.class, Layout.class.getClassLoader());
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101 for (LayoutFactory currentLayoutFactory : serviceLoader) {
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102 if (bestLayoutFactory == null) {
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103 bestLayoutFactory = currentLayoutFactory;
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104 } else if (currentLayoutFactory.getPriority() >= bestLayoutFactory.getPriority()) {
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105 assert currentLayoutFactory.getPriority() != bestLayoutFactory.getPriority();
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106 bestLayoutFactory = currentLayoutFactory;
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107 }
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108 }
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109 }
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110
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111 if (bestLayoutFactory == null) {
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112 throw new AssertionError("LayoutFactory not found");
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113 }
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114 return bestLayoutFactory;
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115 }
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116
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117 /**
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118 * Layout builder.
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119 *
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120 * @see Layout
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121 */
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122 public static final class Builder {
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123 private EnumSet<ImplicitCast> allowedImplicitCasts;
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124
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125 /**
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126 * Create a new layout builder.
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127 */
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128 private Builder() {
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129 this.allowedImplicitCasts = EnumSet.noneOf(ImplicitCast.class);
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130 }
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131
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132 /**
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133 * Build {@link Layout} from the configuration in this builder.
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134 */
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135 public Layout build() {
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136 return Layout.getFactory().createLayout(this);
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137 }
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138
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139 /**
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140 * Set the allowed implicit casts in this layout.
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141 *
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142 * @see Layout.ImplicitCast
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143 */
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144 public Builder setAllowedImplicitCasts(EnumSet<ImplicitCast> allowedImplicitCasts) {
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145 this.allowedImplicitCasts = allowedImplicitCasts;
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146 return this;
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147 }
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148
22287
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149 /**
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150 * Add an allowed implicit cast in this layout.
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151 *
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152 * @see Layout.ImplicitCast
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153 */
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154 public Builder addAllowedImplicitCast(ImplicitCast allowedImplicitCast) {
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155 this.allowedImplicitCasts.add(allowedImplicitCast);
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156 return this;
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157 }
22151
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158 }
22306
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159
8bc57c7bbf88 Deprecate Layout.Builder#getAllowedImplicitCasts()
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160 protected static EnumSet<ImplicitCast> getAllowedImplicitCasts(Builder builder) {
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161 return builder.allowedImplicitCasts;
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162 }
18407
f439fdb137a3 Truffle: initial commit of object API
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163 }