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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleLanguage.java @ 21468:99942eac9c6d

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Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Fri, 22 May 2015 13:41:10 +0200
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children bb51b9a142b3
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21468
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
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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;
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26
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27 import com.oracle.truffle.api.impl.Accessor;
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28 import com.oracle.truffle.api.source.Source;
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29 import com.oracle.truffle.api.vm.TruffleVM;
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30 import com.oracle.truffle.api.vm.TruffleVM.Language;
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31 import java.io.IOException;
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32 import java.lang.annotation.ElementType;
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33 import java.lang.annotation.Retention;
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34 import java.lang.annotation.RetentionPolicy;
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35 import java.lang.annotation.Target;
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36
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37 /**
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38 * An entry point for everyone who wants to implement a Truffle based language. By providing
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39 * implementation of this type and registering it using {@link Registration} annotation, your
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40 * language becomes accessible to users of the {@link TruffleVM Truffle virtual machine} - all they
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41 * will need to do is to include your JAR into their application and all the Truffle goodies (multi
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42 * language support, multi tennat hosting, debugging, etc.) will be made available to them.
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43 */
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44 public abstract class TruffleLanguage {
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45 private Env env;
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46
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47 /**
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48 * The annotation to use to register your language to the {@link TruffleVM Truffle} system. By
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49 * annotating your implementation of {@link TruffleLanguage} by this annotation you are just a
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50 * <em>one JAR drop to the classpath</em> away from your users. Once they include your JAR in
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51 * their application, your language will be available to the {@link TruffleVM Truffle virtual
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52 * machine}.
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53 */
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54 @Retention(RetentionPolicy.SOURCE)
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55 @Target(ElementType.TYPE)
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56 public @interface Registration {
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57 /**
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58 * Unique name of your language. This name will be exposed to users via the
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59 * {@link Language#getName()} getter.
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60 *
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61 * @return identifier of your language
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62 */
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63 String name();
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64
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65 /**
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66 * List of mimetypes associated with your language. Users will use them (directly or
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67 * inderectly) when {@link TruffleVM#eval(java.lang.String, java.lang.String) executing}
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68 * their code snippets or their {@link TruffleVM#eval(java.net.URI) files}.
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69 *
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70 * @return array of mime types assigned to your language files
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71 */
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72 String[] mimeType();
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73 }
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74
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75 @SuppressWarnings("all")
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76 void attachEnv(Env env) {
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77 this.env = env;
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78 }
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79
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80 protected final Env env() {
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81 if (this.env == null) {
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82 throw new NullPointerException("Accessing env before initialization is finished");
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83 }
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84 return this.env;
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85 }
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86
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87 protected abstract Object eval(Source code) throws IOException;
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88
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89 /**
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90 * Called when some other language is seeking for a global symbol. This method is supposed to do
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91 * lazy binding, e.g. there is no need to export symbols in advance, it is fine to wait until
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92 * somebody asks for it (by calling this method).
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93 * <p>
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94 * The exported object can either be <code>TruffleObject</code> (e.g. a native object from the
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95 * other language) to support interoperability between languages or one of Java primitive
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96 * wrappers ( {@link Integer}, {@link Double}, {@link Short}, etc.).
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97 *
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98 * @param globalName the name of the global symbol to find
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99 * @return an exported object or <code>null</code>, if the symbol does not represent anything
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100 * meaningful in this language
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101 */
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102 protected abstract Object findExportedSymbol(String globalName);
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103
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104 /**
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105 * Returns global object for the language.
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106 * <p>
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107 * The object is expected to be <code>TruffleObject</code> (e.g. a native object from the other
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108 * language) but technically it can be one of Java primitive wrappers ({@link Integer},
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109 * {@link Double}, {@link Short}, etc.).
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110 *
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111 * @return the global object or <code>null</code> if the language does not support such concept
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112 */
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113 protected abstract Object getLanguageGlobal();
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114
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115 /**
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116 * Checks whether the object is provided by this language.
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117 *
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118 * @param object the object to check
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119 * @return <code>true</code> if this language can deal with such object in native way
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120 */
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121 protected abstract boolean isObjectOfLanguage(Object object);
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122
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123 /**
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124 * Represents execution environment of the {@link TruffleLanguage}. Each active
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125 * {@link TruffleLanguage} receives instance of the environment before any code is executed upon
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126 * it. The environment has knowledge of all active languages and can exchange symbols between
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127 * them.
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128 */
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129 public static final class Env {
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130 private final TruffleVM vm;
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131 private final TruffleLanguage lang;
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132
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133 Env(TruffleVM vm, TruffleLanguage lang) {
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134 this.vm = vm;
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135 this.lang = lang;
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136 }
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137
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138 /**
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139 * Asks the environment to go through other registered languages and find whether they
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140 * export global symbol of specified name. The expected return type is either
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141 * <code>TruffleObject</code>, or one of wrappers of Java primitive types ({@link Integer},
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142 * {@link Double}).
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143 *
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144 * @param globalName the name of the symbol to search for
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145 * @return object representing the symbol or <code>null</code>
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146 */
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147 public Object importSymbol(String globalName) {
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148 return API.importSymbol(vm, lang, globalName);
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149 }
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150 }
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151
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152 private static final AccessAPI API = new AccessAPI();
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153
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154 private static final class AccessAPI extends Accessor {
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155
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156 @Override
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157 protected Env attachEnv(TruffleVM vm, TruffleLanguage l) {
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158 Env env = new Env(vm, l);
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159 l.attachEnv(env);
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160 return env;
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161 }
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162
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163 @Override
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164 public Object importSymbol(TruffleVM vm, TruffleLanguage queryingLang, String globalName) {
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165 return super.importSymbol(vm, queryingLang, globalName);
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166 }
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167
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168 @Override
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169 protected Object eval(TruffleLanguage l, Source s) throws IOException {
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170 return l.eval(s);
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171 }
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172
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173 @Override
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174 protected Object findExportedSymbol(TruffleLanguage l, String globalName) {
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175 return l.findExportedSymbol(globalName);
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176 }
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177
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178 @Override
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179 protected Object languageGlobal(TruffleLanguage l) {
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180 return l.getLanguageGlobal();
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181 }
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182 }
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183 }