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annotate truffle/com.oracle.truffle.api.interop/src/com/oracle/truffle/api/interop/Message.java @ 22106:3b2ae36a942f

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Improving documentation of READ and WRITE Message
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Tue, 25 Aug 2015 09:38:50 +0200
parents 9c8c0937da41
children f84a7663966d
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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
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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.interop;
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26
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27 import com.oracle.truffle.api.nodes.Node;
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28 import com.oracle.truffle.api.interop.ForeignAccess.Factory;
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29
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30 /**
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31 * Inter-operability is based on sending messages. Standard messages are defined as as constants
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32 * like {@link #IS_NULL} or factory methods in this class, but one can always define their own,
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33 * specialized messages.
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34 */
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35 public abstract class Message {
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36 /**
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37 * Message to read an object field. The
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38 * {@link Factory#access(com.oracle.truffle.api.interop.Message) target} created for this
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39 * message accepts single {@link ForeignAccess#getArguments(com.oracle.truffle.api.frame.Frame)
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40 * argument} identifying a field to read - e.g. either {@link String} or an {@link Integer} - if
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41 * access to an array at particular index is requested.
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42 */
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43 public static final Message READ = Read.INSTANCE;
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44
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45 /**
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46 * Converts {@link TruffleObject truffle value} to Java primitive type. Primitive types are
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47 * subclasses of {@link Number}, {@link Boolean}, {@link Character} and {@link String}. Related
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48 * to {@link #IS_BOXED} message.
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49 */
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50 public static final Message UNBOX = Unbox.INSTANCE;
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51
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52 /**
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53 * Message to write a field. The {@link Factory#access(com.oracle.truffle.api.interop.Message)
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54 * target} created for this message accepts two
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55 * {@link ForeignAccess#getArguments(com.oracle.truffle.api.frame.Frame) arguments}. The first
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56 * one identifies a field to read - e.g. either {@link String} or an {@link Integer} - if access
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57 * to an array at particular index is requested. The second one is the value to assign to such
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58 * field.
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59 */
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60 public static Message WRITE = Write.INSTANCE;
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61
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62 /**
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63 * Creates an execute message. All messages created by this method are
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64 * {@link Object#equals(java.lang.Object) equal} to each other regardless of the value of
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65 * <code>argumentsLength</code>.
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66 *
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67 * @param argumentsLength number of parameters to pass to the target
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68 * @return execute message
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69 */
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70 public static Message createExecute(int argumentsLength) {
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71 return Execute.create(false, argumentsLength);
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72 }
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73
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74 /**
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75 * Message to check for executability.
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76 * <p>
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77 * Calling {@link Factory#access(com.oracle.truffle.api.interop.Message) the target} created for
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78 * this message should yield value of {@link Boolean}.
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79 */
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80 public static final Message IS_EXECUTABLE = IsExecutable.INSTANCE;
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81
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82 /**
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83 * Creates an execute message. All messages created by this method are
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84 * {@link Object#equals(java.lang.Object) equal} to each other regardless of the value of
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85 * <code>argumentsLength</code>. The expected behavior of this message is to perform
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86 * {@link #READ} first and on the result invoke {@link #createExecute(int)}.
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87 *
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88 * @param argumentsLength number of parameters to pass to the target
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89 * @return read & execute message
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90 */
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91 public static Message createInvoke(int argumentsLength) {
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92 return Execute.create(true, argumentsLength);
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93 }
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94
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95 /**
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96 * Check for <code>null</code> message. The Truffle languages are suggested to have their own
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97 * object representing <code>null</code> like values in their languages. For purposes of
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98 * inter-operability it is essential to canonicalize such values from time to time - sending
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99 * this message is a way to recognize such <code>null</code> representing values.
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100 * <p>
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101 * Calling {@link Factory#access(com.oracle.truffle.api.interop.Message) the target} created for
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102 * this message should yield value of {@link Boolean}.
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103 */
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104 public static final Message IS_NULL = IsNull.INSTANCE;
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105
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106 /**
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107 * Message to check for having a size.
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108 * <p>
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109 * Calling {@link Factory#access(com.oracle.truffle.api.interop.Message) the target} created for
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110 * this message should yield value of {@link Boolean}.
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111 */
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112 public static final Message HAS_SIZE = HasSize.INSTANCE;
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113
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114 /**
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115 * Getter of the size. If {@link #HAS_SIZE supported}, this message allows to obtain a size (of
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116 * an array).
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117 * <p>
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118 * Calling {@link Factory#access(com.oracle.truffle.api.interop.Message) the target} created for
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119 * this message should yield value of {@link Integer}.
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120 */
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121 public static final Message GET_SIZE = GetSize.INSTANCE;
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122
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123 /**
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124 * Check for value being boxed. Can you value be converted to one of the basic Java types? Many
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125 * languages have a special representation for types like number, string, etc. To ensure
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126 * inter-operability, these types should support unboxing - if they do, they should handle this
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127 * message.
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128 * <p>
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129 * Calling {@link Factory#accessMessage(com.oracle.truffle.api.interop.Message) the target}
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130 * created for this message should yield value of {@link Boolean}.
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131 */
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132 public static final Message IS_BOXED = IsBoxed.INSTANCE;
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133
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134 /**
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135 * Compares types of two messages. Messages are encouraged to implement this method. All
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136 * standard ones ({@link #IS_NULL}, {@link #READ}, etc.) do so. Messages obtained via the same
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137 * {@link #createExecute(int) method} are equal, messages obtained by different methods or
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138 * fields are not.
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139 *
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140 * @param message the object to compare to
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141 * @return true, if the structure of the message is that same as of <code>this</code> one.
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142 */
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143 @Override
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144 public abstract boolean equals(Object message);
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145
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146 /**
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147 * When re-implementing {@link #equals(java.lang.Object)}, it is generally recommended to also
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148 * implement <code>hashCode()</code>.
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149 *
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150 * @return hash code
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151 */
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152 @Override
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153 public abstract int hashCode();
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154
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155 /**
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156 * Creates an AST node for this message. The node can be inserted into AST of your language and
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157 * will handle communication with the foreign language.
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158 *
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159 * @return node to be inserted into your AST and passed back to
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160 * {@link ForeignAccess#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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161 * method.
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162 */
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163 public final Node createNode() {
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164 return new ForeignObjectAccessHeadNode(this);
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165 }
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166
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167 }