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annotate graal/com.oracle.truffle.api.interop/src/com/oracle/truffle/api/interop/ForeignAccess.java @ 21770:c76742cc2c6f

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Polishing inter-operability APIs: Exposing only Message, TruffleObject and ForeignAccess-related classes.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Mon, 08 Jun 2015 04:50:13 +0200
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21770
c76742cc2c6f Polishing inter-operability APIs: Exposing only Message, TruffleObject and ForeignAccess-related classes.
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1 /*
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2 * Copyright (c) 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
c76742cc2c6f Polishing inter-operability APIs: Exposing only Message, TruffleObject and ForeignAccess-related classes.
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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
c76742cc2c6f Polishing inter-operability APIs: Exposing only Message, TruffleObject and ForeignAccess-related classes.
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18 * 2 along with this work; if not, write to the Free Software Foundation,
c76742cc2c6f Polishing inter-operability APIs: Exposing only Message, TruffleObject and ForeignAccess-related classes.
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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.interop;
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26
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27 import com.oracle.truffle.api.CallTarget;
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28 import com.oracle.truffle.api.frame.Frame;
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29 import com.oracle.truffle.api.frame.VirtualFrame;
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30 import com.oracle.truffle.api.interop.impl.ReadOnlyArrayList;
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31 import com.oracle.truffle.api.nodes.Node;
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32 import java.util.List;
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33
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34 /**
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35 * Encapsulates types of access to {@link TruffleObject}. If you want to expose your own objects to
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36 * foreign language implementations, you need to implement {@link TruffleObject} and its
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37 * {@link TruffleObject#getForeignAccess()} method. To create instance of <code>ForeignAccess</code>
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38 * , use one of the factory methods available in this class.
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39 */
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40 public final class ForeignAccess {
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41 private final Factory factory;
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42
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43 private ForeignAccess(Factory faf) {
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44 this.factory = faf;
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45 }
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46
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47 /**
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48 * Creates new instance of {@link ForeignAccess} that delegates to provided factory.
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49 *
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50 * @param baseClass the super class of all {@link TruffleObject}s handled by this factory (if
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51 * <code>null</code> than the second interface also needs to implement
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52 * {@link Factory})
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53 * @param factory the factory that handles access requests to {@link Message}s known as of
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54 * version 1.0
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55 * @return new instance wrapping <code>factory</code>
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56 */
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57 public static ForeignAccess create(final Class<? extends TruffleObject> baseClass, final Factory10 factory) {
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58 if (baseClass == null) {
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59 Factory f = (Factory) factory;
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60 assert f != null;
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61 }
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62 class DelegatingFactory implements Factory {
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63 @Override
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64 public boolean canHandle(TruffleObject obj) {
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65 if (baseClass == null) {
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66 return ((Factory) factory).canHandle(obj);
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67 }
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68 return baseClass.isInstance(obj);
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69 }
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70
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71 @Override
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72 public CallTarget accessMessage(Message msg) {
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73 if (msg instanceof KnownMessage) {
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74 switch (msg.hashCode()) {
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75 case Execute.HASH1:
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76 return factory.accessInvoke(((Execute) msg).getArity());
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77 case Execute.HASH2:
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78 return factory.accessExecute(((Execute) msg).getArity());
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79 case GetSize.HASH:
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80 return factory.accessGetSize();
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81 case HasSize.HASH:
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82 return factory.accessHasSize();
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83 case IsBoxed.HASH:
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84 return factory.accessIsBoxed();
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85 case IsExecutable.HASH:
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86 return factory.accessIsExecutable();
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87 case IsNull.HASH:
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88 return factory.accessIsNull();
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89 case Read.HASH:
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90 return factory.accessRead();
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91 case Unbox.HASH:
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92 return factory.accessUnbox();
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93 case Write.HASH:
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94 return factory.accessWrite();
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95 }
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96 }
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97 return factory.accessMessage(msg);
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98 }
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99 }
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100 return new ForeignAccess(new DelegatingFactory());
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101 }
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102
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103 /**
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104 * Creates new instance of {@link ForeignAccess} that delegates to provided factory.
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105 *
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106 * @param factory the factory that handles various access requests {@link Message}s.
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107 * @return new instance wrapping <code>factory</code>
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108 */
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109 public static ForeignAccess create(Factory factory) {
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110 return new ForeignAccess(factory);
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111 }
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112
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113 /**
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114 * Executes {@link Message#createNode() foreign node}.
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115 *
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116 * @param foreignNode the createNode created by {@link Message#createNode()}
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117 * @param frame the call frame
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118 * @param receiver foreign object to receive the message passed to {@link Message#createNode()}
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119 * method
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120 * @param arguments parameters for the receiver
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121 * @return return value, if any
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122 * @throws ClassCastException if the createNode has not been created by
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123 * {@link Message#createNode()} method.
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124 */
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125 public static Object execute(Node foreignNode, VirtualFrame frame, TruffleObject receiver, Object... arguments) {
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126 ForeignObjectAccessHeadNode fn = (ForeignObjectAccessHeadNode) foreignNode;
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127 return fn.executeForeign(frame, receiver, arguments);
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128 }
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129
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130 /**
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131 * Read only access to foreign call arguments inside of a frame.
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132 *
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133 * @param frame the frame that was called via
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134 * {@link #execute(com.oracle.truffle.api.nodes.Node, com.oracle.truffle.api.frame.VirtualFrame, com.oracle.truffle.api.interop.TruffleObject, java.lang.Object...) }
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135 * @return read-only list of parameters passed to the frame
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136 */
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137 public static List<Object> getArguments(Frame frame) {
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138 final Object[] arr = frame.getArguments();
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139 return ReadOnlyArrayList.asList(arr, 1, arr.length);
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140 }
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141
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142 /**
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143 * The foreign receiver in the frame.
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144 *
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145 * @param frame the frame that was called via
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146 * {@link #execute(com.oracle.truffle.api.nodes.Node, com.oracle.truffle.api.frame.VirtualFrame, com.oracle.truffle.api.interop.TruffleObject, java.lang.Object...) }
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147 * @return the receiver used when invoking the frame
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148 */
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149 public static TruffleObject getReceiver(Frame frame) {
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150 return (TruffleObject) frame.getArguments()[ForeignAccessArguments.RECEIVER_INDEX];
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151 }
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152
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153 CallTarget access(Message message) {
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154 return factory.accessMessage(message);
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155 }
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156
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157 boolean canHandle(TruffleObject receiver) {
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158 return factory.canHandle(receiver);
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159 }
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160
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161 /**
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162 * Interface of a factory that produces AST snippets that can access a foreign
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163 * {@code TruffleObject}. A Truffle language implementation accesses a {@code TruffleObject} via
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164 * a {@code Message}. The {@code TruffleObject} instance provides a {@link ForeignAccess}
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165 * instance (built via {@link #create(com.oracle.truffle.api.interop.ForeignAccess.Factory)})
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166 * that provides an AST snippet for a given {@link Message}. Rather than using this generic
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167 * {@code Factory}, consider implementing {@link Factory10} interface that captures the set of
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168 * messages each language should implement as of Truffle version 1.0.
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169 */
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170 public interface Factory {
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171
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172 /**
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173 * * Checks whether provided {@link TruffleObject} can be accessed using AST snippets
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174 * produced by this {@link Factory}.
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175 *
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176 * @param obj the object to check
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177 * @return true, if the object can be processed
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178 */
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179 boolean canHandle(TruffleObject obj);
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180
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181 /**
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182 * Provides an AST snippet to access a {@code TruffleObject}.
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183 *
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184 * @param tree the {@code Message} that represents the access to a {@code TruffleObject}.
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185 * @return the AST snippet for accessing the {@code TruffleObject}, wrapped as a
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186 * {@code CallTarget}.
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187 */
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188 CallTarget accessMessage(Message tree);
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189 }
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190
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191 /**
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192 * Specialized {@link Factory factory} that handles {@link Message messages} known as of release
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193 * 1.0 of Truffle API.
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194 *
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195 */
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196 public interface Factory10 {
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197 /**
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198 * Handles {@link Message#IS_NULL} message.
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199 *
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200 * @return call target to handle the message or <code>null</code> if this message is not
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201 * supported
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202 */
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203 CallTarget accessIsNull();
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204
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205 /**
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206 * Handles {@link Message#IS_EXECUTABLE} message.
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207 *
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208 * @return call target to handle the message or <code>null</code> if this message is not
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209 * supported
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210 */
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211 CallTarget accessIsExecutable();
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212
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213 /**
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214 * Handles {@link Message#IS_BOXED} message.
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215 *
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216 * @return call target to handle the message or <code>null</code> if this message is not
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217 * supported
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218 */
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219 CallTarget accessIsBoxed();
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220
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221 /**
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222 * Handles {@link Message#HAS_SIZE} message.
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223 *
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224 * @return call target to handle the message or <code>null</code> if this message is not
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225 * supported
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226 */
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227 CallTarget accessHasSize();
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228
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229 /**
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230 * Handles {@link Message#GET_SIZE} message.
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231 *
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232 * @return call target to handle the message or <code>null</code> if this message is not
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233 * supported
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234 */
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235 CallTarget accessGetSize();
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236
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237 /**
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238 * Handles {@link Message#UNBOX} message.
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239 *
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240 * @return call target to handle the message or <code>null</code> if this message is not
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241 * supported
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242 */
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243 CallTarget accessUnbox();
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244
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245 /**
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246 * Handles {@link Message#READ} message.
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247 *
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248 * @return call target to handle the message or <code>null</code> if this message is not
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249 * supported
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250 */
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251 CallTarget accessRead();
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252
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253 /**
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254 * Handles {@link Message#WRITE} message.
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255 *
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256 * @return call target to handle the message or <code>null</code> if this message is not
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257 * supported
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258 */
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259 CallTarget accessWrite();
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260
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261 /**
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262 * Handles {@link Message#createExecute(int)} messages.
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263 *
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264 * @param argumentsLength number of parameters the messages has been created for
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265 * @return call target to handle the message or <code>null</code> if this message is not
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266 * supported
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267 */
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268 CallTarget accessExecute(int argumentsLength);
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269
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270 /**
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271 * Handles {@link Message#createInvoke(int)} messages.
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272 *
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273 * @param argumentsLength number of parameters the messages has been created for
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274 * @return call target to handle the message or <code>null</code> if this message is not
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275 * supported
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276 */
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277 CallTarget accessInvoke(int argumentsLength);
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278
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279 /**
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280 * Handles request for access to a message not known in version 1.0.
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281 *
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282 * @param unknown the message
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283 * @return call target to handle the message or <code>null</code> if this message is not
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284 * supported
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285 */
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286 CallTarget accessMessage(Message unknown);
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287 }
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288 }