Mercurial > hg > truffle
annotate truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleLanguage.java @ 21951:9c8c0937da41
Moving all sources into truffle subdirectory
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Wed, 17 Jun 2015 10:58:08 +0200 |
parents | graal/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleLanguage.java@894f82515e38 |
children | e7c2d36daf72 |
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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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30 |
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31 import com.oracle.truffle.api.debug.*; |
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32 import com.oracle.truffle.api.impl.*; |
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33 import com.oracle.truffle.api.instrument.*; |
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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 |
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38 /** |
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39 * An entry point for everyone who wants to implement a Truffle based language. By providing |
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40 * implementation of this type and registering it using {@link Registration} annotation, your |
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41 * language becomes accessible to users of the {@link TruffleVM Truffle virtual machine} - all they |
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42 * will need to do is to include your JAR into their application and all the Truffle goodies (multi |
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43 * language support, multitenant hosting, debugging, etc.) will be made available to them. |
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44 */ |
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45 public abstract class TruffleLanguage { |
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46 private final Env env; |
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47 |
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48 /** |
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49 * Constructor to be called by subclasses. |
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50 * |
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51 * @param env language environment that will be available via {@link #env()} method to |
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52 * subclasses. |
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53 */ |
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54 protected TruffleLanguage(Env env) { |
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55 this.env = env; |
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56 } |
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57 |
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58 /** |
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59 * The annotation to use to register your language to the {@link TruffleVM Truffle} system. By |
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60 * annotating your implementation of {@link TruffleLanguage} by this annotation you are just a |
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61 * <em>one JAR drop to the class path</em> away from your users. Once they include your JAR in |
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62 * their application, your language will be available to the {@link TruffleVM Truffle virtual |
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63 * machine}. |
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64 */ |
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65 @Retention(RetentionPolicy.SOURCE) |
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66 @Target(ElementType.TYPE) |
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67 public @interface Registration { |
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68 /** |
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69 * Unique name of your language. This name will be exposed to users via the |
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70 * {@link Language#getName()} getter. |
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71 * |
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72 * @return identifier of your language |
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73 */ |
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74 String name(); |
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75 |
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76 /** |
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77 * Unique string identifying the language version. This name will be exposed to users via |
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78 * the {@link Language#getVersion()} getter. |
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79 * |
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80 * @return version of your language |
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81 */ |
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82 String version(); |
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83 |
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84 /** |
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85 * List of MIME types associated with your language. Users will use them (directly or |
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86 * indirectly) when {@link TruffleVM#eval(java.lang.String, java.lang.String) executing} |
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87 * their code snippets or their {@link TruffleVM#eval(java.net.URI) files}. |
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88 * |
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89 * @return array of MIME types assigned to your language files |
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90 */ |
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91 String[] mimeType(); |
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92 } |
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93 |
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94 protected final Env env() { |
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95 if (this.env == null) { |
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96 throw new NullPointerException("Accessing env before initialization is finished"); |
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97 } |
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98 return this.env; |
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99 } |
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100 |
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101 protected abstract Object eval(Source code) throws IOException; |
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102 |
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103 /** |
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104 * Called when some other language is seeking for a global symbol. This method is supposed to do |
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105 * lazy binding, e.g. there is no need to export symbols in advance, it is fine to wait until |
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106 * somebody asks for it (by calling this method). |
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107 * <p> |
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108 * The exported object can either be <code>TruffleObject</code> (e.g. a native object from the |
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109 * other language) to support interoperability between languages, {@link String} or one of Java |
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110 * primitive wrappers ( {@link Integer}, {@link Double}, {@link Short}, {@link Boolean}, etc.). |
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111 * <p> |
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112 * The way a symbol becomes <em>exported</em> is language dependent. In general it is preferred |
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113 * to make the export explicit - e.g. call some function or method to register an object under |
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114 * specific name. Some languages may however decide to support implicit export of symbols (for |
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115 * example from global scope, if they have one). However explicit exports should always be |
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116 * preferred. Implicitly exported object of some name should only be used when there is no |
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117 * explicit export under such <code>globalName</code>. To ensure so the infrastructure first |
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118 * asks all known languages for <code>onlyExplicit</code> symbols and only when none is found, |
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119 * it does one more round with <code>onlyExplicit</code> set to <code>false</code>. |
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120 * |
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121 * @param globalName the name of the global symbol to find |
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122 * @param onlyExplicit should the language seek for implicitly exported object or only consider |
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123 * the explicitly exported ones? |
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124 * @return an exported object or <code>null</code>, if the symbol does not represent anything |
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125 * meaningful in this language |
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126 */ |
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127 protected abstract Object findExportedSymbol(String globalName, boolean onlyExplicit); |
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128 |
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129 /** |
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130 * Returns global object for the language. |
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131 * <p> |
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132 * The object is expected to be <code>TruffleObject</code> (e.g. a native object from the other |
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133 * language) but technically it can be one of Java primitive wrappers ({@link Integer}, |
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134 * {@link Double}, {@link Short}, etc.). |
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135 * |
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136 * @return the global object or <code>null</code> if the language does not support such concept |
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137 */ |
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138 protected abstract Object getLanguageGlobal(); |
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139 |
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140 /** |
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141 * Checks whether the object is provided by this language. |
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142 * |
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143 * @param object the object to check |
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144 * @return <code>true</code> if this language can deal with such object in native way |
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145 */ |
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146 protected abstract boolean isObjectOfLanguage(Object object); |
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147 |
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148 protected abstract ToolSupportProvider getToolSupport(); |
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149 |
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150 protected abstract DebugSupportProvider getDebugSupport(); |
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151 |
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152 /** |
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153 * Represents execution environment of the {@link TruffleLanguage}. Each active |
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154 * {@link TruffleLanguage} receives instance of the environment before any code is executed upon |
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155 * it. The environment has knowledge of all active languages and can exchange symbols between |
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156 * them. |
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157 */ |
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158 public static final class Env { |
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159 private final TruffleVM vm; |
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160 private final TruffleLanguage lang; |
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161 private final Reader in; |
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162 private final Writer err; |
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163 private final Writer out; |
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164 |
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165 Env(TruffleVM vm, Constructor<?> langConstructor, Writer out, Writer err, Reader in) { |
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166 this.vm = vm; |
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167 this.in = in; |
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168 this.err = err; |
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169 this.out = out; |
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170 try { |
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171 this.lang = (TruffleLanguage) langConstructor.newInstance(this); |
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172 } catch (Exception ex) { |
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173 throw new IllegalStateException("Cannot construct language " + langConstructor.getDeclaringClass().getName(), ex); |
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174 } |
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175 } |
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176 |
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177 /** |
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178 * Asks the environment to go through other registered languages and find whether they |
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179 * export global symbol of specified name. The expected return type is either |
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180 * <code>TruffleObject</code>, or one of wrappers of Java primitive types ({@link Integer}, |
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181 * {@link Double}). |
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182 * |
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183 * @param globalName the name of the symbol to search for |
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184 * @return object representing the symbol or <code>null</code> |
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185 */ |
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186 public Object importSymbol(String globalName) { |
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187 return API.importSymbol(vm, lang, globalName); |
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188 } |
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189 |
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190 /** |
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191 * Input associated with this {@link TruffleVM}. |
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192 * |
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193 * @return reader, never <code>null</code> |
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194 */ |
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195 public Reader stdIn() { |
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196 return in; |
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197 } |
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198 |
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199 /** |
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200 * Standard output writer for this {@link TruffleVM}. |
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201 * |
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202 * @return writer, never <code>null</code> |
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203 */ |
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204 public Writer stdOut() { |
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205 return out; |
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206 } |
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207 |
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208 /** |
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209 * Standard error writer for this {@link TruffleVM}. |
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210 * |
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211 * @return writer, never <code>null</code> |
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212 */ |
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213 public Writer stdErr() { |
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214 return err; |
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215 } |
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216 } |
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217 |
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218 private static final AccessAPI API = new AccessAPI(); |
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219 |
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220 private static final class AccessAPI extends Accessor { |
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221 @Override |
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222 protected TruffleLanguage attachEnv(TruffleVM vm, Constructor<?> langClazz, Writer stdOut, Writer stdErr, Reader stdIn) { |
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223 Env env = new Env(vm, langClazz, stdOut, stdErr, stdIn); |
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224 return env.lang; |
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225 } |
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226 |
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227 @Override |
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228 public Object importSymbol(TruffleVM vm, TruffleLanguage queryingLang, String globalName) { |
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229 return super.importSymbol(vm, queryingLang, globalName); |
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230 } |
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231 |
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232 @Override |
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233 protected Object eval(TruffleLanguage l, Source s) throws IOException { |
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234 return l.eval(s); |
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235 } |
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236 |
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237 @Override |
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238 protected Object findExportedSymbol(TruffleLanguage l, String globalName, boolean onlyExplicit) { |
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239 return l.findExportedSymbol(globalName, onlyExplicit); |
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240 } |
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241 |
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242 @Override |
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243 protected Object languageGlobal(TruffleLanguage l) { |
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244 return l.getLanguageGlobal(); |
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245 } |
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246 |
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247 @Override |
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248 protected ToolSupportProvider getToolSupport(TruffleLanguage l) { |
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249 return l.getToolSupport(); |
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250 } |
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251 |
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252 @Override |
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253 protected DebugSupportProvider getDebugSupport(TruffleLanguage l) { |
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254 return l.getDebugSupport(); |
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255 } |
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256 } |
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257 |
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258 } |