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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleLanguage.java @ 21716:2f9e4d984d16

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Give languages a chance to do implicit exports. Prefer explicit exports over implicit ones.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Thu, 04 Jun 2015 08:08:05 +0200
parents 1c76a5662753
children 45083be8a812
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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 import java.lang.reflect.*;
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31 import com.oracle.truffle.api.impl.*;
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32 import com.oracle.truffle.api.source.*;
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33 import com.oracle.truffle.api.vm.*;
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34 import com.oracle.truffle.api.vm.TruffleVM.Language;
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35
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36 /**
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37 * An entry point for everyone who wants to implement a Truffle based language. By providing
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38 * implementation of this type and registering it using {@link Registration} annotation, your
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39 * language becomes accessible to users of the {@link TruffleVM Truffle virtual machine} - all they
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40 * will need to do is to include your JAR into their application and all the Truffle goodies (multi
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41 * language support, multitenant hosting, debugging, etc.) will be made available to them.
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42 */
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43 public abstract class TruffleLanguage {
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44 private final Env env;
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45
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46 /**
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47 * Constructor to be called by subclasses.
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48 *
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49 * @param env language environment that will be available via {@link #env()} method to
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50 * subclasses.
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51 */
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52 protected TruffleLanguage(Env env) {
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53 this.env = env;
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54 }
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55
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56 /**
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57 * The annotation to use to register your language to the {@link TruffleVM Truffle} system. By
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58 * annotating your implementation of {@link TruffleLanguage} by this annotation you are just a
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59 * <em>one JAR drop to the class path</em> away from your users. Once they include your JAR in
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60 * their application, your language will be available to the {@link TruffleVM Truffle virtual
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61 * machine}.
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62 */
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63 @Retention(RetentionPolicy.SOURCE)
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64 @Target(ElementType.TYPE)
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65 public @interface Registration {
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66 /**
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67 * Unique name of your language. This name will be exposed to users via the
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68 * {@link Language#getName()} getter.
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69 *
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70 * @return identifier of your language
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71 */
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72 String name();
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73
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74 /**
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75 * List of MIME types associated with your language. Users will use them (directly or
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76 * indirectly) when {@link TruffleVM#eval(java.lang.String, java.lang.String) executing}
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77 * their code snippets or their {@link TruffleVM#eval(java.net.URI) files}.
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78 *
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79 * @return array of MIME types assigned to your language files
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80 */
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81 String[] mimeType();
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82 }
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83
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84 protected final Env env() {
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85 if (this.env == null) {
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86 throw new NullPointerException("Accessing env before initialization is finished");
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87 }
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88 return this.env;
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89 }
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90
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91 protected abstract Object eval(Source code) throws IOException;
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92
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93 /**
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94 * Called when some other language is seeking for a global symbol. This method is supposed to do
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95 * lazy binding, e.g. there is no need to export symbols in advance, it is fine to wait until
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96 * somebody asks for it (by calling this method).
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97 * <p>
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98 * The exported object can either be <code>TruffleObject</code> (e.g. a native object from the
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99 * other language) to support inter-operability between languages, {@link String} or one of Java
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100 * primitive wrappers ( {@link Integer}, {@link Double}, {@link Short}, {@link Boolean}, etc.).
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101 * <p>
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102 * The way a symbol becomes <em>exported</em> is language dependant. In general it is preferred
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103 * to make the export explicit - e.g. call some function or method to register an object under
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104 * specific name. Some languages may however decide to support implicit export of symbols (for
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105 * example from global scope, if they have one). However explicit exports should always be
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106 * preferred. Implicitly exported object of some name should only be used when there is no
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107 * explicit export under such <code>globalName</code>. To ensure so the infrastructure first
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108 * asks all known languages for <code>onlyExplicit</code> symbols and only when none is found,
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109 * it does one more round with <code>onlyExplicit</code> set to <code>false</code>.
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110 *
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111 * @param globalName the name of the global symbol to find
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112 * @param onlyExplicit should the language seek for implicitly exported object or only consider
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113 * the explicitly exported ones?
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114 * @return an exported object or <code>null</code>, if the symbol does not represent anything
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115 * meaningful in this language
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116 */
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117 protected abstract Object findExportedSymbol(String globalName, boolean onlyExplicit);
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118
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119 /**
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120 * Returns global object for the language.
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121 * <p>
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122 * The object is expected to be <code>TruffleObject</code> (e.g. a native object from the other
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123 * language) but technically it can be one of Java primitive wrappers ({@link Integer},
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124 * {@link Double}, {@link Short}, etc.).
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125 *
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126 * @return the global object or <code>null</code> if the language does not support such concept
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127 */
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128 protected abstract Object getLanguageGlobal();
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129
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130 /**
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131 * Checks whether the object is provided by this language.
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132 *
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133 * @param object the object to check
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134 * @return <code>true</code> if this language can deal with such object in native way
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135 */
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136 protected abstract boolean isObjectOfLanguage(Object object);
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137
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138 /**
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139 * Represents execution environment of the {@link TruffleLanguage}. Each active
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140 * {@link TruffleLanguage} receives instance of the environment before any code is executed upon
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141 * it. The environment has knowledge of all active languages and can exchange symbols between
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142 * them.
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143 */
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144 public static final class Env {
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145 private final TruffleVM vm;
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146 private final TruffleLanguage lang;
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147 private final Reader in;
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148 private final Writer err;
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149 private final Writer out;
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150
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151 Env(TruffleVM vm, Constructor<?> langConstructor, Writer out, Writer err, Reader in) {
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152 this.vm = vm;
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153 this.in = in;
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154 this.err = err;
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155 this.out = out;
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156 try {
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157 this.lang = (TruffleLanguage) langConstructor.newInstance(this);
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158 } catch (Exception ex) {
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159 throw new IllegalStateException("Cannot construct language " + langConstructor.getDeclaringClass().getName(), ex);
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160 }
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161 }
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162
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163 /**
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164 * Asks the environment to go through other registered languages and find whether they
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165 * export global symbol of specified name. The expected return type is either
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166 * <code>TruffleObject</code>, or one of wrappers of Java primitive types ({@link Integer},
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167 * {@link Double}).
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168 *
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169 * @param globalName the name of the symbol to search for
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170 * @return object representing the symbol or <code>null</code>
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171 */
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172 public Object importSymbol(String globalName) {
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173 return API.importSymbol(vm, lang, globalName);
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174 }
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175
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176 /**
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177 * Input associated with this {@link TruffleVM}.
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178 *
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179 * @return reader, never <code>null</code>
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180 */
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181 public Reader stdIn() {
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182 return in;
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183 }
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184
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185 /**
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186 * Standard output writer for this {@link TruffleVM}.
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187 *
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188 * @return writer, never <code>null</code>
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189 */
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190 public Writer stdOut() {
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191 return out;
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192 }
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193
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194 /**
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195 * Standard error writer for this {@link TruffleVM}.
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196 *
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197 * @return writer, never <code>null</code>
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198 */
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199 public Writer stdErr() {
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200 return err;
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201 }
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202 }
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203
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204 private static final AccessAPI API = new AccessAPI();
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205
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206 private static final class AccessAPI extends Accessor {
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207 @Override
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208 protected TruffleLanguage attachEnv(TruffleVM vm, Constructor<?> langClazz, Writer stdOut, Writer stdErr, Reader stdIn) {
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209 Env env = new Env(vm, langClazz, stdOut, stdErr, stdIn);
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210 return env.lang;
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211 }
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212
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213 @Override
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214 public Object importSymbol(TruffleVM vm, TruffleLanguage queryingLang, String globalName) {
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215 return super.importSymbol(vm, queryingLang, globalName);
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216 }
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217
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218 @Override
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219 protected Object eval(TruffleLanguage l, Source s) throws IOException {
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220 return l.eval(s);
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221 }
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222
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223 @Override
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224 protected Object findExportedSymbol(TruffleLanguage l, String globalName, boolean onlyExplicit) {
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225 return l.findExportedSymbol(globalName, onlyExplicit);
21468
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226 }
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227
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228 @Override
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229 protected Object languageGlobal(TruffleLanguage l) {
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230 return l.getLanguageGlobal();
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231 }
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232 }
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233 }