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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleLanguage.java @ 21490:3286fb5fea4a

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Introducing standard I/O and error into Env and using TruffleVM to execute SL test cases. Adding SLTckTest to verify SL language interop.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Tue, 26 May 2015 19:11:36 +0200
parents bb51b9a142b3
children 31fc2fce38f3
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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.io.Reader;
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33 import java.io.Writer;
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34 import java.lang.annotation.ElementType;
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35 import java.lang.annotation.Retention;
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36 import java.lang.annotation.RetentionPolicy;
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37 import java.lang.annotation.Target;
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38 import java.lang.reflect.Constructor;
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39
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40 /**
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41 * An entry point for everyone who wants to implement a Truffle based language. By providing
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42 * implementation of this type and registering it using {@link Registration} annotation, your
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43 * language becomes accessible to users of the {@link TruffleVM Truffle virtual machine} - all they
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44 * will need to do is to include your JAR into their application and all the Truffle goodies (multi
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45 * language support, multi tennat hosting, debugging, etc.) will be made available to them.
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46 */
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47 public abstract class TruffleLanguage {
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48 private final Env env;
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49
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50 /**
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51 * Constructor to be called by subclasses.
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52 *
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53 * @param env language environment that will be available via {@link #env()} method to
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54 * subclasses.
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55 */
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56 protected TruffleLanguage(Env env) {
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57 this.env = env;
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58 }
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59
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60 /**
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61 * The annotation to use to register your language to the {@link TruffleVM Truffle} system. By
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62 * annotating your implementation of {@link TruffleLanguage} by this annotation you are just a
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63 * <em>one JAR drop to the classpath</em> away from your users. Once they include your JAR in
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64 * their application, your language will be available to the {@link TruffleVM Truffle virtual
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65 * machine}.
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66 */
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67 @Retention(RetentionPolicy.SOURCE)
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68 @Target(ElementType.TYPE)
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69 public @interface Registration {
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70 /**
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71 * Unique name of your language. This name will be exposed to users via the
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72 * {@link Language#getName()} getter.
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73 *
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74 * @return identifier of your language
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75 */
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76 String name();
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77
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78 /**
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79 * List of mimetypes associated with your language. Users will use them (directly or
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80 * inderectly) when {@link TruffleVM#eval(java.lang.String, java.lang.String) executing}
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81 * their code snippets or their {@link TruffleVM#eval(java.net.URI) files}.
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82 *
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83 * @return array of mime types assigned to your language files
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84 */
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85 String[] mimeType();
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86 }
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87
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88 protected final Env env() {
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89 if (this.env == null) {
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90 throw new NullPointerException("Accessing env before initialization is finished");
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91 }
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92 return this.env;
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93 }
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94
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95 protected abstract Object eval(Source code) throws IOException;
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96
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97 /**
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98 * Called when some other language is seeking for a global symbol. This method is supposed to do
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99 * lazy binding, e.g. there is no need to export symbols in advance, it is fine to wait until
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100 * somebody asks for it (by calling this method).
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101 * <p>
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102 * The exported object can either be <code>TruffleObject</code> (e.g. a native object from the
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103 * other language) to support interoperability between languages or one of Java primitive
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104 * wrappers ( {@link Integer}, {@link Double}, {@link Short}, etc.).
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105 *
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106 * @param globalName the name of the global symbol to find
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107 * @return an exported object or <code>null</code>, if the symbol does not represent anything
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108 * meaningful in this language
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109 */
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110 protected abstract Object findExportedSymbol(String globalName);
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111
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112 /**
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113 * Returns global object for the language.
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114 * <p>
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115 * The object is expected to be <code>TruffleObject</code> (e.g. a native object from the other
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116 * language) but technically it can be one of Java primitive wrappers ({@link Integer},
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117 * {@link Double}, {@link Short}, etc.).
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118 *
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119 * @return the global object or <code>null</code> if the language does not support such concept
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120 */
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121 protected abstract Object getLanguageGlobal();
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122
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123 /**
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124 * Checks whether the object is provided by this language.
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125 *
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126 * @param object the object to check
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127 * @return <code>true</code> if this language can deal with such object in native way
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128 */
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129 protected abstract boolean isObjectOfLanguage(Object object);
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130
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131 /**
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132 * Represents execution environment of the {@link TruffleLanguage}. Each active
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133 * {@link TruffleLanguage} receives instance of the environment before any code is executed upon
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134 * it. The environment has knowledge of all active languages and can exchange symbols between
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135 * them.
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136 */
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137 public static final class Env {
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138 private final TruffleVM vm;
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139 private final TruffleLanguage lang;
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140 private final Reader in;
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141 private final Writer err;
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142 private final Writer out;
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143
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144 Env(TruffleVM vm, Constructor<?> langConstructor, Writer out, Writer err, Reader in) {
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145 this.vm = vm;
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146 this.in = in;
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147 this.err = err;
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148 this.out = out;
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149 try {
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150 this.lang = (TruffleLanguage) langConstructor.newInstance(this);
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151 } catch (Exception ex) {
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152 throw new IllegalStateException("Cannot construct language " + langConstructor.getDeclaringClass().getName(), ex);
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153 }
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154 }
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155
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156 /**
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157 * Asks the environment to go through other registered languages and find whether they
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158 * export global symbol of specified name. The expected return type is either
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159 * <code>TruffleObject</code>, or one of wrappers of Java primitive types ({@link Integer},
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160 * {@link Double}).
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161 *
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162 * @param globalName the name of the symbol to search for
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163 * @return object representing the symbol or <code>null</code>
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164 */
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165 public Object importSymbol(String globalName) {
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166 return API.importSymbol(vm, lang, globalName);
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167 }
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168
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169 /**
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170 * Input associated with this {@link TruffleVM}.
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171 *
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172 * @return reader, never <code>null</code>
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173 */
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174 public Reader stdIn() {
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175 return in;
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176 }
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177
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178 /**
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179 * Standard output writer for this {@link TruffleVM}.
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180 *
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181 * @return writer, never <code>null</code>
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182 */
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183 public Writer stdOut() {
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184 return out;
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185 }
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186
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187 /**
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188 * Standard error writer for this {@link TruffleVM}.
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189 *
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190 * @return writer, never <code>null</code>
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191 */
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192 public Writer stdErr() {
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193 return err;
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194 }
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195 }
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196
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197 private static final AccessAPI API = new AccessAPI();
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198
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199 private static final class AccessAPI extends Accessor {
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200 @Override
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201 protected TruffleLanguage attachEnv(TruffleVM vm, Constructor<?> langClazz, Writer stdOut, Writer stdErr, Reader stdIn) {
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202 Env env = new Env(vm, langClazz, stdOut, stdErr, stdIn);
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203 return env.lang;
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204 }
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205
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206 @Override
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207 public Object importSymbol(TruffleVM vm, TruffleLanguage queryingLang, String globalName) {
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208 return super.importSymbol(vm, queryingLang, globalName);
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209 }
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210
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211 @Override
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212 protected Object eval(TruffleLanguage l, Source s) throws IOException {
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213 return l.eval(s);
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214 }
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215
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216 @Override
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217 protected Object findExportedSymbol(TruffleLanguage l, String globalName) {
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218 return l.findExportedSymbol(globalName);
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219 }
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
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220
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
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221 @Override
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
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222 protected Object languageGlobal(TruffleLanguage l) {
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
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223 return l.getLanguageGlobal();
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
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224 }
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
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225 }
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
Jaroslav Tulach <jaroslav.tulach@oracle.com>
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226 }