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annotate truffle/com.oracle.truffle.api.object/src/com/oracle/truffle/api/object/Layout.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 494bfe8a25ff
children 567d324c306c
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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 com.oracle.truffle.api.nodes.NodeUtil.FieldOffsetProvider;
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28 import com.oracle.truffle.api.object.Shape.Allocator;
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29 import java.util.EnumSet;
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30 import java.util.ServiceLoader;
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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 EnumSet<ImplicitCast> NONE = EnumSet.noneOf(ImplicitCast.class);
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39 public static final EnumSet<ImplicitCast> INT_TO_DOUBLE = EnumSet.of(ImplicitCast.IntToDouble);
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40 public static final EnumSet<ImplicitCast> INT_TO_LONG = EnumSet.of(ImplicitCast.IntToLong);
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41
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42 public static final String OPTION_PREFIX = "truffle.object.";
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43
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44 private static final LayoutFactory LAYOUT_FACTORY = loadLayoutFactory();
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45
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46 /**
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47 * Specifies the allowed implicit casts between primitive types without losing type information.
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48 */
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49 public enum ImplicitCast {
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50 IntToDouble,
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51 IntToLong,
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52 }
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53
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54 /**
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55 * Create a new {@link LayoutBuilder}.
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56 */
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57 public static Builder newLayout() {
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58 return new Builder();
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59 }
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60
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61 /**
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62 * Equivalent to {@code Layout.newLayout().build()}.
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63 */
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64 public static Layout createLayout() {
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65 return createLayout(NONE);
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66 }
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67
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68 /**
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69 * Equivalent to
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70 * {@code Layout.newLayout().setAllowedImplicitCasts(allowedImplicitCasts).build()}.
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71 */
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72 @Deprecated
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73 public static Layout createLayout(EnumSet<ImplicitCast> allowedImplicitCasts) {
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74 return newLayout().setAllowedImplicitCasts(allowedImplicitCasts).build();
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75 }
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76
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77 public abstract DynamicObject newInstance(Shape shape);
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78
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79 public abstract Class<? extends DynamicObject> getType();
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80
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81 public abstract Shape createShape(ObjectType operations);
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82
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83 public abstract Shape createShape(ObjectType operations, Object sharedData);
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84
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85 public abstract Shape createShape(ObjectType operations, Object sharedData, int id);
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86
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87 /**
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88 * Create an allocator for static property creation. Reserves all array extension slots.
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89 */
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90 public abstract Allocator createAllocator();
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91
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92 protected static LayoutFactory getFactory() {
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93 return LAYOUT_FACTORY;
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94 }
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95
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96 private static LayoutFactory loadLayoutFactory() {
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97 LayoutFactory bestLayoutFactory = null;
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98
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99 String layoutFactoryImplClassName = System.getProperty(OPTION_PREFIX + "LayoutFactory");
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100 if (layoutFactoryImplClassName != null) {
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101 Class<?> clazz;
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102 try {
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103 clazz = Class.forName(layoutFactoryImplClassName);
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104 } catch (ClassNotFoundException e) {
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105 throw new RuntimeException(e);
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106 }
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107 try {
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108 bestLayoutFactory = (LayoutFactory) clazz.newInstance();
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109 } catch (InstantiationException | IllegalAccessException e) {
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110 throw new AssertionError(e);
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111 }
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112 } else {
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113 ServiceLoader<LayoutFactory> serviceLoader = ServiceLoader.load(LayoutFactory.class, Layout.class.getClassLoader());
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114 for (LayoutFactory currentLayoutFactory : serviceLoader) {
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115 if (bestLayoutFactory == null) {
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116 bestLayoutFactory = currentLayoutFactory;
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117 } else if (currentLayoutFactory.getPriority() >= bestLayoutFactory.getPriority()) {
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118 assert currentLayoutFactory.getPriority() != bestLayoutFactory.getPriority();
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119 bestLayoutFactory = currentLayoutFactory;
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120 }
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121 }
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122 }
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123
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124 if (bestLayoutFactory == null) {
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125 throw new AssertionError("LayoutFactory not found");
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126 }
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127 return bestLayoutFactory;
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128 }
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129
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130 /**
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131 * Layout builder.
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132 *
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133 * @see Layout
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134 */
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135 public static final class Builder {
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136 private EnumSet<ImplicitCast> allowedImplicitCasts;
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137 private FieldOffsetProvider fieldOffsetProvider;
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138
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139 /**
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140 * Create a new layout builder.
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141 */
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142 private Builder() {
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143 this.allowedImplicitCasts = Layout.NONE;
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144 this.fieldOffsetProvider = null;
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145 }
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146
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147 /**
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148 * Build {@link Layout} from the configuration in this builder.
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149 */
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150 public Layout build() {
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151 return Layout.getFactory().createLayout(this);
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152 }
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153
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154 /**
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155 * Set the allowed implicit casts in this layout.
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156 *
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157 * @see Layout.ImplicitCast
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158 */
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159 public Builder setAllowedImplicitCasts(EnumSet<ImplicitCast> allowedImplicitCasts) {
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160 this.allowedImplicitCasts = allowedImplicitCasts;
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161 return this;
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162 }
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163
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164 /**
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165 * Set a custom field offset provider for this layout.
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166 */
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167 public Builder setFieldOffsetProvider(FieldOffsetProvider fieldOffsetProvider) {
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168 this.fieldOffsetProvider = fieldOffsetProvider;
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169 return this;
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170 }
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171
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172 public EnumSet<ImplicitCast> getAllowedImplicitCasts() {
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173 return allowedImplicitCasts;
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174 }
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175
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176 public FieldOffsetProvider getFieldOffsetProvider() {
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177 return fieldOffsetProvider;
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178 }
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179 }
18407
f439fdb137a3 Truffle: initial commit of object API
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180 }