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annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleLanguage.java @ 22070:a7ca9e9a1d51

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Removing VirtualFrame parameter. Documenting.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 06 Aug 2015 18:08:27 +0200
parents fec8f8a61f6c
children ff531952a91c
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1 /*
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2 * Copyright (c) 2014, 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. 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;
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26
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27 import java.io.*;
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28 import java.lang.annotation.*;
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29
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30 import com.oracle.truffle.api.debug.*;
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31 import com.oracle.truffle.api.impl.*;
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32 import com.oracle.truffle.api.instrument.*;
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33 import com.oracle.truffle.api.nodes.Node;
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34 import com.oracle.truffle.api.source.*;
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35 import com.oracle.truffle.api.vm.*;
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36 import com.oracle.truffle.api.vm.TruffleVM.Language;
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37 import java.util.Collections;
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38 import java.util.Map;
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39 import java.util.WeakHashMap;
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40
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41 /**
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42 * An entry point for everyone who wants to implement a Truffle based language. By providing
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43 * implementation of this type and registering it using {@link Registration} annotation, your
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44 * language becomes accessible to users of the {@link TruffleVM Truffle virtual machine} - all they
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45 * will need to do is to include your JAR into their application and all the Truffle goodies (multi
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46 * language support, multitenant hosting, debugging, etc.) will be made available to them.
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47 *
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48 * @param <C> internal state of the language associated with every thread that is executing program
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49 * {@link #parse(com.oracle.truffle.api.source.Source, com.oracle.truffle.api.nodes.Node, java.lang.String...)
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50 * parsed} by the language
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51 */
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52 public abstract class TruffleLanguage<C> {
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53 /**
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54 * Constructor to be called by subclasses.
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55 */
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56 protected TruffleLanguage() {
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57 }
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58
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59 /**
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60 * The annotation to use to register your language to the {@link TruffleVM Truffle} system. By
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61 * annotating your implementation of {@link TruffleLanguage} by this annotation you are just a
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62 * <em>one JAR drop to the class path</em> away from your users. Once they include your JAR in
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63 * their application, your language will be available to the {@link TruffleVM Truffle virtual
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64 * machine}.
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65 */
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66 @Retention(RetentionPolicy.SOURCE)
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67 @Target(ElementType.TYPE)
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68 public @interface Registration {
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69 /**
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70 * Unique name of your language. This name will be exposed to users via the
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71 * {@link Language#getName()} getter.
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72 *
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73 * @return identifier of your language
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74 */
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75 String name();
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76
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77 /**
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78 * Unique string identifying the language version. This name will be exposed to users via
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79 * the {@link Language#getVersion()} getter.
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80 *
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81 * @return version of your language
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82 */
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83 String version();
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84
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85 /**
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86 * List of MIME types associated with your language. Users will use them (directly or
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87 * indirectly) when {@link TruffleVM#eval(java.lang.String, java.lang.String) executing}
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88 * their code snippets or their {@link TruffleVM#eval(java.net.URI) files}.
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89 *
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90 * @return array of MIME types assigned to your language files
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91 */
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92 String[] mimeType();
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93 }
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94
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95 /**
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96 * Creates internal representation of the executing context suitable for given environment. Each
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97 * time the {@link TruffleLanguage language} is used by a new {@link TruffleVM} or in a new
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98 * thread, the system calls this method to let the {@link TruffleLanguage language} prepare for
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99 * <em>execution</em>. The returned execution context is completely language specific; it is
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100 * however expected it will contain reference to here-in provided <code>env</code> and adjust
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101 * itself according to parameters provided by the <code>env</code> object.
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102 *
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103 * @param env the environment the language is supposed to operate in
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104 * @return internal data of the language in given environment
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105 */
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106 protected abstract C createContext(Env env);
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107
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108 /**
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109 * Parses the provided source and generates appropriate AST. The parsing should execute no user
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110 * code, it should only create the {@link Node} tree to represent the source. The parsing may be
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111 * performed in a context (specified as another {@link Node}) or without context. The
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112 * {@code argumentNames} may contain symbolic names for actual parameters of the call to the
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113 * returned value. The result should be a call target with method
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114 * {@link CallTarget#call(java.lang.Object...)} that accepts as many arguments as were provided
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115 * via the {@code argumentNames} array.
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116 *
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117 * @param code source code to parse
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118 * @param context a {@link Node} defining context for the parsing
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119 * @param argumentNames symbolic names for parameters of
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120 * {@link CallTarget#call(java.lang.Object...)}
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121 * @return a call target to invoke which also keeps in memory the {@link Node} tree representing
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122 * just parsed <code>code</code>
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123 * @throws IOException thrown when I/O or parsing goes wrong
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124 */
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125 protected abstract CallTarget parse(Source code, Node context, String... argumentNames) throws IOException;
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126
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127 /**
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128 * Called when some other language is seeking for a global symbol. This method is supposed to do
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129 * lazy binding, e.g. there is no need to export symbols in advance, it is fine to wait until
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130 * somebody asks for it (by calling this method).
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131 * <p>
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132 * The exported object can either be <code>TruffleObject</code> (e.g. a native object from the
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133 * other language) to support interoperability between languages, {@link String} or one of Java
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134 * primitive wrappers ( {@link Integer}, {@link Double}, {@link Short}, {@link Boolean}, etc.).
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135 * <p>
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136 * The way a symbol becomes <em>exported</em> is language dependent. In general it is preferred
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137 * to make the export explicit - e.g. call some function or method to register an object under
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138 * specific name. Some languages may however decide to support implicit export of symbols (for
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139 * example from global scope, if they have one). However explicit exports should always be
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140 * preferred. Implicitly exported object of some name should only be used when there is no
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141 * explicit export under such <code>globalName</code>. To ensure so the infrastructure first
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142 * asks all known languages for <code>onlyExplicit</code> symbols and only when none is found,
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143 * it does one more round with <code>onlyExplicit</code> set to <code>false</code>.
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144 *
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145 * @param globalName the name of the global symbol to find
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146 * @param onlyExplicit should the language seek for implicitly exported object or only consider
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147 * the explicitly exported ones?
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148 * @return an exported object or <code>null</code>, if the symbol does not represent anything
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149 * meaningful in this language
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150 */
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151 protected abstract Object findExportedSymbol(C context, String globalName, boolean onlyExplicit);
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152
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153 /**
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154 * Returns global object for the language.
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155 * <p>
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156 * The object is expected to be <code>TruffleObject</code> (e.g. a native object from the other
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157 * language) but technically it can be one of Java primitive wrappers ({@link Integer},
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158 * {@link Double}, {@link Short}, etc.).
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159 *
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160 * @return the global object or <code>null</code> if the language does not support such concept
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161 */
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162 protected abstract Object getLanguageGlobal(C context);
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163
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164 /**
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165 * Checks whether the object is provided by this language.
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166 *
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167 * @param object the object to check
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168 * @return <code>true</code> if this language can deal with such object in native way
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169 */
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170 protected abstract boolean isObjectOfLanguage(Object object);
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171
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172 protected abstract ToolSupportProvider getToolSupport();
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173
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174 protected abstract DebugSupportProvider getDebugSupport();
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175
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176 /**
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177 * Allows a language implementor to create a node that can effectively lookup up the context
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178 * associated with current execution. The context is created by
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179 * {@link #createContext(com.oracle.truffle.api.TruffleLanguage.Env)} method.
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180 *
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181 * @return node to be inserted into program to effectively find out current execution context
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182 * for this language
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183 */
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184 @SuppressWarnings({"rawtypes", "unchecked"})
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185 protected final Node createFindContextNode() {
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186 final Class<? extends TruffleLanguage<?>> c = (Class<? extends TruffleLanguage<?>>) getClass();
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187 return new FindContextNode(c);
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188 }
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189
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190 /**
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191 * Uses the {@link #createFindContextNode()} node to obtain the current context.
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192 *
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193 * @param n the node created by this language's {@link #createFindContextNode()}
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194 * @return the context created by
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195 * {@link #createContext(com.oracle.truffle.api.TruffleLanguage.Env)} method at the
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196 * beginning of the language execution
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197 * @throws ClassCastException if the node has not been created by <code>this</code>.
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198 * {@link #createFindContextNode()} method.
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199 */
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200 @SuppressWarnings({"rawtypes", "unchecked"})
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201 protected final C findContext(Node n) {
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202 FindContextNode fcn = (FindContextNode) n;
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203 if (fcn.getLanguageClass() != getClass()) {
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204 throw new ClassCastException();
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205 }
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206 return (C) fcn.executeFindContext();
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207 }
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208
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209 private static final class LangCtx<C> {
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210 final TruffleLanguage<C> lang;
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211 final C ctx;
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212
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213 public LangCtx(TruffleLanguage<C> lang, Env env) {
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214 this.lang = lang;
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215 this.ctx = lang.createContext(env);
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216 }
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217
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218 Object findExportedSymbol(String globalName, boolean onlyExplicit) {
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219 return lang.findExportedSymbol(ctx, globalName, onlyExplicit);
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220 }
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221
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222 Object getLanguageGlobal() {
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223 return lang.getLanguageGlobal(ctx);
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224 }
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225 }
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226
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227 /**
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228 * Represents execution environment of the {@link TruffleLanguage}. Each active
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229 * {@link TruffleLanguage} receives instance of the environment before any code is executed upon
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230 * it. The environment has knowledge of all active languages and can exchange symbols between
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231 * them.
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232 */
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233 public static final class Env {
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234 private final TruffleVM vm;
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235 private final LangCtx<?> langCtx;
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236 private final Reader in;
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237 private final Writer err;
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238 private final Writer out;
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239
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240 Env(TruffleVM vm, TruffleLanguage<?> lang, Writer out, Writer err, Reader in) {
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241 this.vm = vm;
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242 this.in = in;
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243 this.err = err;
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244 this.out = out;
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245 this.langCtx = new LangCtx<>(lang, this);
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246 }
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247
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248 /**
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249 * Asks the environment to go through other registered languages and find whether they
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250 * export global symbol of specified name. The expected return type is either
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251 * <code>TruffleObject</code>, or one of wrappers of Java primitive types ({@link Integer},
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252 * {@link Double}).
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253 *
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254 * @param globalName the name of the symbol to search for
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255 * @return object representing the symbol or <code>null</code>
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256 */
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257 public Object importSymbol(String globalName) {
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258 return API.importSymbol(vm, langCtx.lang, globalName);
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259 }
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260
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261 /**
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262 * Input associated with this {@link TruffleVM}.
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263 *
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264 * @return reader, never <code>null</code>
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265 */
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266 public Reader stdIn() {
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267 return in;
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268 }
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269
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270 /**
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271 * Standard output writer for this {@link TruffleVM}.
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272 *
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273 * @return writer, never <code>null</code>
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274 */
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275 public Writer stdOut() {
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276 return out;
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277 }
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278
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279 /**
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280 * Standard error writer for this {@link TruffleVM}.
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281 *
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282 * @return writer, never <code>null</code>
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283 */
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284 public Writer stdErr() {
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285 return err;
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286 }
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287 }
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288
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289 private static final AccessAPI API = new AccessAPI();
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290
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291 @SuppressWarnings("rawtypes")
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292 private static final class AccessAPI extends Accessor {
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293 @Override
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294 protected Env attachEnv(TruffleVM vm, TruffleLanguage<?> language, Writer stdOut, Writer stdErr, Reader stdIn) {
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295 Env env = new Env(vm, language, stdOut, stdErr, stdIn);
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296 return env;
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297 }
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298
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299 @Override
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300 public Object importSymbol(TruffleVM vm, TruffleLanguage<?> queryingLang, String globalName) {
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301 return super.importSymbol(vm, queryingLang, globalName);
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302 }
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303
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304 private static final Map<Source, CallTarget> COMPILED = Collections.synchronizedMap(new WeakHashMap<Source, CallTarget>());
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305
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306 @Override
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307 protected Object eval(TruffleLanguage<?> language, Source source) throws IOException {
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308 CallTarget target = COMPILED.get(source);
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309 if (target == null) {
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310 target = language.parse(source, null);
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311 if (target == null) {
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312 throw new IOException("Parsing has not produced a CallTarget for " + source);
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313 }
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314 COMPILED.put(source, target);
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315 }
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316 try {
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317 return target.call();
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318 } catch (Exception ex) {
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319 throw new IOException(ex);
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320 }
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321 }
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322
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323 @Override
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324 protected Object findExportedSymbol(TruffleLanguage.Env env, String globalName, boolean onlyExplicit) {
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325 return env.langCtx.findExportedSymbol(globalName, onlyExplicit);
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326 }
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327
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328 @Override
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329 protected Env findLanguage(TruffleVM vm, Class<? extends TruffleLanguage> languageClass) {
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330 return super.findLanguage(vm, languageClass);
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331 }
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332
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333 @Override
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334 protected Object languageGlobal(TruffleLanguage.Env env) {
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335 return env.langCtx.getLanguageGlobal();
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336 }
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337
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338 @Override
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339 protected Object findContext(Env env) {
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340 return env.langCtx.ctx;
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341 }
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342
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343 @Override
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344 protected ToolSupportProvider getToolSupport(TruffleLanguage<?> l) {
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345 return l.getToolSupport();
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346 }
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347
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348 @Override
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349 protected DebugSupportProvider getDebugSupport(TruffleLanguage<?> l) {
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350 return l.getDebugSupport();
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351 }
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352 }
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353
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354 }