Mercurial > hg > truffle
annotate truffle/com.oracle.truffle.api.vm/src/com/oracle/truffle/api/vm/TruffleVM.java @ 22133:c334865b9d42
Make sure TruffleLanguage.createEnv is only called when Accessor.CURRENT_VM is known
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Fri, 04 Sep 2015 10:39:23 +0200 |
parents | 19205292b0c7 |
children | e70b20f4bb00 |
rev | line source |
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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.vm; |
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26 |
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27 import com.oracle.truffle.api.*; |
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28 import com.oracle.truffle.api.TruffleLanguage.Env; |
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29 import com.oracle.truffle.api.TruffleLanguage.Registration; |
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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.source.*; |
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34 import java.io.*; |
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35 import java.net.*; |
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36 import java.nio.file.*; |
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37 import java.util.*; |
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38 import java.util.concurrent.CountDownLatch; |
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39 import java.util.concurrent.Executor; |
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40 import java.util.logging.*; |
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41 |
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42 /** |
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43 * <em>Virtual machine</em> for Truffle based languages. Term virtual machine is a bit overloaded, |
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44 * so don't think of <em>Java virtual machine</em> here - while we are running and using |
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45 * {@link TruffleVM} inside of a <em>JVM</em> there can be multiple instances (some would say |
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46 * tenants) of {@link TruffleVM} running next to each other in a single <em>JVM</em> with a complete |
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47 * mutual isolation. There is 1:N mapping between <em>JVM</em> and {@link TruffleVM}. |
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48 * <p> |
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49 * It would not be correct to think of a {@link TruffleVM} as a runtime for a single Truffle |
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50 * language (Ruby, Python, R, C, JavaScript, etc.) either. {@link TruffleVM} can host as many of |
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51 * Truffle languages as {@link Registration registered on a class path} of your <em>JVM</em> |
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52 * application. {@link TruffleVM} orchestrates these languages, manages exchange of objects and |
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53 * calls among them. While it may happen that there is just one activated language inside of a |
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54 * {@link TruffleVM}, the greatest strength of {@link TruffleVM} is in interoperability between all |
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55 * Truffle languages. There is 1:N mapping between {@link TruffleVM} and {@link TruffleLanguage |
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56 * Truffle language implementations}. |
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57 * <p> |
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58 * Use {@link #newVM()} to create new isolated virtual machine ready for execution of various |
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59 * languages. All the languages in a single virtual machine see each other exported global symbols |
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60 * and can cooperate. Use {@link #newVM()} multiple times to create different, isolated virtual |
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61 * machines completely separated from each other. |
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62 * <p> |
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63 * Once instantiated use {@link #eval(java.net.URI)} with a reference to a file or URL or directly |
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64 * pass code snippet into the virtual machine via {@link #eval(java.lang.String, java.lang.String)}. |
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65 * Support for individual languages is initialized on demand - e.g. once a file of certain MIME type |
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66 * is about to be processed, its appropriate engine (if found), is initialized. Once an engine gets |
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67 * initialized, it remains so, until the virtual machine isn't garbage collected. |
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68 * <p> |
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69 * The <code>TruffleVM</code> is single-threaded and tries to enforce that. It records the thread it |
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70 * has been {@link Builder#build() created} by and checks that all subsequent calls are coming from |
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71 * the same thread. There is 1:1 mapping between {@link TruffleVM} and a thread that can tell it |
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72 * what to do. |
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73 */ |
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74 @SuppressWarnings("rawtypes") |
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75 public final class TruffleVM { |
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76 private static final Logger LOG = Logger.getLogger(TruffleVM.class.getName()); |
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77 private static final SPIAccessor SPI = new SPIAccessor(); |
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78 private final Thread initThread; |
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79 private final Executor executor; |
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80 private final Map<String, Language> langs; |
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81 private final Reader in; |
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82 private final Writer err; |
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83 private final Writer out; |
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84 private final EventConsumer<?>[] handlers; |
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85 private final Map<String, Object> globals; |
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86 private Debugger debugger; |
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87 |
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88 /** |
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89 * Private & temporary only constructor. |
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90 */ |
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91 private TruffleVM() { |
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92 this.initThread = null; |
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93 this.in = null; |
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94 this.err = null; |
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95 this.out = null; |
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96 this.langs = null; |
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97 this.handlers = null; |
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98 this.globals = null; |
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99 this.executor = null; |
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100 } |
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101 |
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102 /** |
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103 * Real constructor used from the builder. |
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104 */ |
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105 private TruffleVM(Executor executor, Map<String, Object> globals, Writer out, Writer err, Reader in, EventConsumer<?>[] handlers) { |
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106 this.executor = executor; |
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107 this.out = out; |
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108 this.err = err; |
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109 this.in = in; |
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110 this.handlers = handlers; |
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111 this.initThread = Thread.currentThread(); |
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112 this.globals = new HashMap<>(globals); |
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113 this.langs = new HashMap<>(); |
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114 Enumeration<URL> en; |
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115 try { |
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116 en = loader().getResources("META-INF/truffle/language"); |
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117 } catch (IOException ex) { |
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118 throw new IllegalStateException("Cannot read list of Truffle languages", ex); |
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119 } |
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120 while (en.hasMoreElements()) { |
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121 URL u = en.nextElement(); |
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122 Properties p; |
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123 try { |
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124 p = new Properties(); |
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125 try (InputStream is = u.openStream()) { |
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126 p.load(is); |
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127 } |
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128 } catch (IOException ex) { |
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129 LOG.log(Level.CONFIG, "Cannot process " + u + " as language definition", ex); |
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130 continue; |
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131 } |
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132 for (int cnt = 1;; cnt++) { |
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133 String prefix = "language" + cnt + "."; |
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134 if (p.getProperty(prefix + "name") == null) { |
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135 break; |
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136 } |
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137 Language l = new Language(prefix, p); |
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138 for (String mimeType : l.getMimeTypes()) { |
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139 langs.put(mimeType, l); |
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140 } |
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141 } |
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142 } |
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143 } |
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144 |
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145 static ClassLoader loader() { |
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146 ClassLoader l = TruffleVM.class.getClassLoader(); |
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147 if (l == null) { |
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148 l = ClassLoader.getSystemClassLoader(); |
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149 } |
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150 return l; |
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151 } |
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152 |
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153 /** |
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154 * Creation of new Truffle virtual machine. Use the {@link Builder} methods to configure your |
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155 * virtual machine and then create one using {@link Builder#build()}: |
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156 * |
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157 * <pre> |
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158 * {@link TruffleVM} vm = {@link TruffleVM}.{@link TruffleVM#newVM() newVM()} |
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159 * .{@link Builder#stdOut(java.io.Writer) stdOut}({@link Writer yourWriter}) |
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160 * .{@link Builder#stdErr(java.io.Writer) stdErr}({@link Writer yourWriter}) |
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161 * .{@link Builder#stdIn(java.io.Reader) stdIn}({@link Reader yourReader}) |
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162 * .{@link Builder#build() build()}; |
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163 * </pre> |
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164 * |
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165 * It searches for {@link Registration languages registered} in the system class loader and |
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166 * makes them available for later evaluation via |
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167 * {@link #eval(java.lang.String, java.lang.String)} methods. |
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168 * |
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169 * @return new, isolated virtual machine with pre-registered languages |
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170 */ |
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171 public static TruffleVM.Builder newVM() { |
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172 // making Builder non-static inner class is a |
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173 // nasty trick to avoid the Builder class to appear |
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174 // in Javadoc next to TruffleVM class |
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175 TruffleVM vm = new TruffleVM(); |
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176 return vm.new Builder(); |
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177 } |
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178 |
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179 /** |
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180 * Builder for a new {@link TruffleVM}. Call various configuration methods in a chain and at the |
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181 * end create new {@link TruffleVM virtual machine}: |
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182 * |
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183 * <pre> |
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184 * {@link TruffleVM} vm = {@link TruffleVM}.{@link TruffleVM#newVM() newVM()} |
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185 * .{@link Builder#stdOut(java.io.Writer) stdOut}({@link Writer yourWriter}) |
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186 * .{@link Builder#stdErr(java.io.Writer) stdErr}({@link Writer yourWriter}) |
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187 * .{@link Builder#stdIn(java.io.Reader) stdIn}({@link Reader yourReader}) |
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188 * .{@link Builder#build() build()}; |
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189 * </pre> |
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190 */ |
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191 public final class Builder { |
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192 private Writer out; |
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193 private Writer err; |
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194 private Reader in; |
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195 private final List<EventConsumer<?>> handlers = new ArrayList<>(); |
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196 private final Map<String, Object> globals = new HashMap<>(); |
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197 private Executor executor; |
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198 |
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199 Builder() { |
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200 } |
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201 |
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202 /** |
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203 * Changes the default output for languages running in <em>to be created</em> |
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204 * {@link TruffleVM virtual machine}. The default is to use {@link System#out}. |
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205 * |
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206 * @param w the writer to use as output |
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207 * @return instance of this builder |
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208 */ |
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209 public Builder stdOut(Writer w) { |
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210 out = w; |
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211 return this; |
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212 } |
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213 |
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214 /** |
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215 * Changes the error output for languages running in <em>to be created</em> |
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216 * {@link TruffleVM virtual machine}. The default is to use {@link System#err}. |
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217 * |
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218 * @param w the writer to use as output |
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219 * @return instance of this builder |
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220 */ |
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221 public Builder stdErr(Writer w) { |
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222 err = w; |
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223 return this; |
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224 } |
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225 |
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226 /** |
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227 * Changes the default input for languages running in <em>to be created</em> |
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228 * {@link TruffleVM virtual machine}. The default is to use {@link System#out}. |
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229 * |
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230 * @param r the reader to use as input |
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231 * @return instance of this builder |
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232 */ |
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233 public Builder stdIn(Reader r) { |
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234 in = r; |
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235 return this; |
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236 } |
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237 |
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238 /** |
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239 * Registers another instance of {@link EventConsumer} into the to be created |
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240 * {@link TruffleVM}. |
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241 * |
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242 * @param handler the handler to register |
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243 * @return instance of this builder |
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244 */ |
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245 public Builder onEvent(EventConsumer<?> handler) { |
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246 handler.getClass(); |
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247 handlers.add(handler); |
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248 return this; |
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249 } |
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250 |
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251 /** |
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252 * Adds global named symbol into the configuration of to-be-built {@link TruffleVM}. This |
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253 * symbol will be accessible to all languages via {@link Env#importSymbol(java.lang.String)} |
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254 * and will take precedence over {@link TruffleLanguage#findExportedSymbol symbols exported |
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255 * by languages itself}. Repeated use of <code>globalSymbol</code> is possible; later |
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256 * definition of the same name overrides the previous one. |
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257 * |
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258 * @param name name of the symbol to register |
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259 * @param obj value of the object - expected to be primitive wrapper, {@link String} or |
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260 * <code>TruffleObject</code> for mutual inter-operability |
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261 * @return instance of this builder |
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262 * @see TruffleVM#findGlobalSymbol(java.lang.String) |
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263 */ |
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264 public Builder globalSymbol(String name, Object obj) { |
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265 globals.put(name, obj); |
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266 return this; |
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267 } |
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268 |
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269 /** |
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270 * Provides own executor for running {@link TruffleVM} scripts. By default |
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271 * {@link TruffleVM#eval(com.oracle.truffle.api.source.Source)} and |
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272 * {@link Symbol#invoke(java.lang.Object, java.lang.Object...)} are executed synchronously |
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273 * in the calling thread. Sometimes, however it is more beneficial to run them |
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274 * asynchronously - the easiest way to do so is to provide own executor when configuring the |
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275 * { {@link #executor(java.util.concurrent.Executor) the builder}. The executor is expected |
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276 * to execute all {@link Runnable runnables} passed into its |
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277 * {@link Executor#execute(java.lang.Runnable)} method in the order they arrive and in a |
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278 * single (yet arbitrary) thread. |
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279 * |
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280 * @param executor the executor to use for internal execution inside the {@link #build() to |
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281 * be created} {@link TruffleVM} |
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282 * @return instance of this builder |
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283 */ |
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284 @SuppressWarnings("hiding") |
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285 public Builder executor(Executor executor) { |
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286 this.executor = executor; |
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287 return this; |
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288 } |
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289 |
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290 /** |
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291 * Creates the {@link TruffleVM Truffle virtual machine}. The configuration is taken from |
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292 * values passed into configuration methods in this class. |
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293 * |
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294 * @return new, isolated virtual machine with pre-registered languages |
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295 */ |
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296 public TruffleVM build() { |
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297 if (out == null) { |
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298 out = new OutputStreamWriter(System.out); |
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299 } |
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300 if (err == null) { |
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301 err = new OutputStreamWriter(System.err); |
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302 } |
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303 if (in == null) { |
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304 in = new InputStreamReader(System.in); |
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305 } |
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306 Executor nonNullExecutor = executor != null ? executor : new Executor() { |
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307 @Override |
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308 public void execute(Runnable command) { |
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309 command.run(); |
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310 } |
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311 }; |
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312 return new TruffleVM(nonNullExecutor, globals, out, err, in, handlers.toArray(new EventConsumer[0])); |
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313 } |
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314 } |
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315 |
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316 /** |
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317 * Descriptions of languages supported in this Truffle virtual machine. |
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318 * |
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319 * @return an immutable map with keys being MIME types and values the {@link Language |
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320 * descriptions} of associated languages |
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321 */ |
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322 public Map<String, Language> getLanguages() { |
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323 return Collections.unmodifiableMap(langs); |
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324 } |
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325 |
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326 /** |
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327 * Evaluates file located on a given URL. Is equivalent to loading the content of a file and |
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328 * executing it via {@link #eval(java.lang.String, java.lang.String)} with a MIME type guess |
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329 * based on the file's extension and/or content. |
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330 * |
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331 * @param location the location of a file to execute |
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332 * @return result of a processing the file, possibly <code>null</code> |
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333 * @throws IOException exception to signal I/O problems or problems with processing the file's |
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334 * content |
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335 * @deprecated use {@link #eval(com.oracle.truffle.api.source.Source)} |
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336 */ |
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337 @Deprecated |
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338 public Object eval(URI location) throws IOException { |
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339 checkThread(); |
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340 Source s; |
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341 String mimeType; |
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342 if (location.getScheme().equals("file")) { |
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343 File file = new File(location); |
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344 s = Source.fromFileName(file.getPath(), true); |
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345 if (file.getName().endsWith(".c")) { |
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346 mimeType = "text/x-c"; |
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347 } else if (file.getName().endsWith(".sl")) { |
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348 mimeType = "application/x-sl"; |
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349 } else if (file.getName().endsWith(".R") || file.getName().endsWith(".r")) { |
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350 mimeType = "application/x-r"; |
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351 } else { |
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352 mimeType = Files.probeContentType(file.toPath()); |
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353 } |
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354 } else { |
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355 URL url = location.toURL(); |
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356 s = Source.fromURL(url, location.toString()); |
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357 URLConnection conn = url.openConnection(); |
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358 mimeType = conn.getContentType(); |
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359 } |
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360 Language l = langs.get(mimeType); |
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361 if (l == null) { |
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362 throw new IOException("No language for " + location + " with MIME type " + mimeType + " found. Supported types: " + langs.keySet()); |
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363 } |
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364 return eval(l, s).get(); |
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365 } |
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366 |
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367 /** |
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368 * Evaluates code snippet. Chooses a language registered for a given MIME type (throws |
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369 * {@link IOException} if there is none). And passes the specified code to it for execution. |
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370 * |
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371 * @param mimeType MIME type of the code snippet - chooses the right language |
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372 * @param reader the source of code snippet to execute |
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373 * @return result of an execution, possibly <code>null</code> |
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374 * @throws IOException thrown to signal errors while processing the code |
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375 * @deprecated use {@link #eval(com.oracle.truffle.api.source.Source)} |
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376 */ |
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377 @Deprecated |
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378 public Object eval(String mimeType, Reader reader) throws IOException { |
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379 checkThread(); |
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380 Language l = langs.get(mimeType); |
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381 if (l == null) { |
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382 throw new IOException("No language for MIME type " + mimeType + " found. Supported types: " + langs.keySet()); |
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383 } |
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384 return eval(l, Source.fromReader(reader, mimeType)).get(); |
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385 } |
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386 |
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387 /** |
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388 * Evaluates code snippet. Chooses a language registered for a given MIME type (throws |
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389 * {@link IOException} if there is none). And passes the specified code to it for execution. |
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390 * |
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391 * @param mimeType MIME type of the code snippet - chooses the right language |
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392 * @param code the code snippet to execute |
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393 * @return result of an execution, possibly <code>null</code> |
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394 * @throws IOException thrown to signal errors while processing the code |
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395 * @deprecated use {@link #eval(com.oracle.truffle.api.source.Source)} |
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396 */ |
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397 @Deprecated |
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398 public Object eval(String mimeType, String code) throws IOException { |
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399 checkThread(); |
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400 Language l = langs.get(mimeType); |
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401 if (l == null) { |
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402 throw new IOException("No language for MIME type " + mimeType + " found. Supported types: " + langs.keySet()); |
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403 } |
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404 return eval(l, Source.fromText(code, mimeType)).get(); |
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405 } |
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406 |
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407 /** |
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408 * Evaluates provided source. Chooses language registered for a particular |
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409 * {@link Source#getMimeType() MIME type} (throws {@link IOException} if there is none). The |
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410 * language is then allowed to parse and execute the source. |
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411 * |
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412 * @param source code snippet to execute |
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413 * @return a {@link Symbol} object that holds result of an execution, never <code>null</code> |
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414 * @throws IOException thrown to signal errors while processing the code |
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415 */ |
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416 public Symbol eval(Source source) throws IOException { |
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417 String mimeType = source.getMimeType(); |
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418 checkThread(); |
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419 Language l = langs.get(mimeType); |
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420 if (l == null) { |
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421 throw new IOException("No language for MIME type " + mimeType + " found. Supported types: " + langs.keySet()); |
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422 } |
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423 return eval(l, source); |
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424 } |
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425 |
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426 private Symbol eval(final Language l, final Source s) throws IOException { |
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427 final Debugger[] fillIn = {debugger}; |
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428 final Object[] result = {null, null}; |
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429 final CountDownLatch ready = new CountDownLatch(1); |
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430 final TruffleLanguage[] lang = {null}; |
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431 executor.execute(new Runnable() { |
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432 @Override |
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433 public void run() { |
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434 evalImpl(fillIn, lang, s, result, l, ready); |
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435 } |
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436 }); |
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437 exceptionCheck(result); |
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438 return new Symbol(lang[0], result, ready); |
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439 } |
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440 |
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441 @SuppressWarnings("try") |
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442 private void evalImpl(Debugger[] fillIn, TruffleLanguage<?>[] fillLang, Source s, Object[] result, Language l, CountDownLatch ready) { |
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443 try (Closeable d = SPI.executionStart(this, fillIn, s)) { |
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444 TruffleLanguage<?> langImpl = l.getImpl(); |
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445 fillLang[0] = langImpl; |
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446 TruffleVM.findDebuggerSupport(langImpl); |
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447 if (debugger == null) { |
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448 debugger = fillIn[0]; |
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449 } |
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450 result[0] = SPI.eval(langImpl, s); |
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451 } catch (IOException ex) { |
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452 result[1] = ex; |
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453 } finally { |
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454 ready.countDown(); |
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455 } |
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456 } |
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457 |
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458 /** |
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459 * Looks global symbol provided by one of initialized languages up. First of all execute your |
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460 * program via one of your {@link #eval(java.lang.String, java.lang.String)} and then look |
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461 * expected symbol up using this method. |
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462 * <p> |
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463 * The names of the symbols are language dependent, but for example the Java language bindings |
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464 * follow the specification for method references: |
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465 * <ul> |
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466 * <li>"java.lang.Exception::new" is a reference to constructor of {@link Exception} |
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467 * <li>"java.lang.Integer::valueOf" is a reference to static method in {@link Integer} class |
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468 * </ul> |
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469 * Once an symbol is obtained, it remembers values for fast access and is ready for being |
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470 * invoked. |
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471 * |
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472 * @param globalName the name of the symbol to find |
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473 * @return found symbol or <code>null</code> if it has not been found |
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474 */ |
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475 public Symbol findGlobalSymbol(final String globalName) { |
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476 checkThread(); |
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477 final TruffleLanguage<?>[] lang = {null}; |
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478 final Object[] obj = {globals.get(globalName), null}; |
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479 final CountDownLatch ready = new CountDownLatch(1); |
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480 if (obj[0] == null) { |
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481 executor.execute(new Runnable() { |
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482 @Override |
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483 public void run() { |
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484 findGlobalSymbolImpl(obj, globalName, lang, ready); |
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485 } |
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486 }); |
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487 try { |
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488 ready.await(); |
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489 } catch (InterruptedException ex) { |
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490 LOG.log(Level.SEVERE, null, ex); |
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491 } |
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492 } else { |
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493 ready.countDown(); |
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494 } |
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495 return obj[0] == null ? null : new Symbol(lang[0], obj, ready); |
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496 } |
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497 |
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498 private void findGlobalSymbolImpl(Object[] obj, String globalName, TruffleLanguage<?>[] lang, CountDownLatch ready) { |
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499 if (obj[0] == null) { |
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500 for (Language dl : langs.values()) { |
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501 TruffleLanguage<?> l = dl.getImpl(false); |
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502 if (l == null) { |
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503 continue; |
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504 } |
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505 obj[0] = SPI.findExportedSymbol(dl.getEnv(), globalName, true); |
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506 if (obj[0] != null) { |
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507 lang[0] = l; |
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508 break; |
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509 } |
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510 } |
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511 } |
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512 if (obj[0] == null) { |
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513 for (Language dl : langs.values()) { |
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514 TruffleLanguage<?> l = dl.getImpl(false); |
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515 if (l == null) { |
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516 continue; |
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517 } |
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518 obj[0] = SPI.findExportedSymbol(dl.getEnv(), globalName, false); |
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519 if (obj[0] != null) { |
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520 lang[0] = l; |
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521 break; |
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522 } |
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523 } |
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524 } |
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525 ready.countDown(); |
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526 } |
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527 |
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528 private void checkThread() { |
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529 if (initThread != Thread.currentThread()) { |
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530 throw new IllegalStateException("TruffleVM created on " + initThread.getName() + " but used on " + Thread.currentThread().getName()); |
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531 } |
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532 } |
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533 |
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534 @SuppressWarnings("unchecked") |
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535 void dispatch(Object ev) { |
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536 Class type = ev.getClass(); |
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537 if (type == SuspendedEvent.class) { |
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538 dispatchSuspendedEvent((SuspendedEvent) ev); |
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539 } |
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540 if (type == ExecutionEvent.class) { |
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541 dispatchExecutionEvent((ExecutionEvent) ev); |
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542 } |
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543 dispatch(type, ev); |
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544 } |
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545 |
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546 @SuppressWarnings("unused") |
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547 void dispatchSuspendedEvent(SuspendedEvent event) { |
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548 } |
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549 |
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550 @SuppressWarnings("unused") |
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551 void dispatchExecutionEvent(ExecutionEvent event) { |
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552 } |
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553 |
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554 @SuppressWarnings("unchecked") |
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555 <Event> void dispatch(Class<Event> type, Event event) { |
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556 for (EventConsumer handler : handlers) { |
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557 if (handler.type == type) { |
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558 handler.on(event); |
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559 } |
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560 } |
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561 } |
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562 |
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563 static void exceptionCheck(Object[] result) throws RuntimeException, IOException { |
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564 if (result[1] instanceof IOException) { |
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565 throw (IOException) result[1]; |
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566 } |
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567 if (result[1] instanceof RuntimeException) { |
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568 throw (RuntimeException) result[1]; |
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569 } |
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570 } |
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571 |
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572 /** |
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573 * Represents {@link TruffleVM#findGlobalSymbol(java.lang.String) global symbol} provided by one |
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574 * of the initialized languages in {@link TruffleVM Truffle virtual machine}. |
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575 */ |
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576 public class Symbol { |
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577 private final TruffleLanguage<?> language; |
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578 private final Object[] result; |
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579 private final CountDownLatch ready; |
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580 private CallTarget target; |
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581 |
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582 Symbol(TruffleLanguage<?> language, Object[] result, CountDownLatch ready) { |
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583 this.language = language; |
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584 this.result = result; |
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585 this.ready = ready; |
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586 } |
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587 |
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588 /** |
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589 * Obtains the object represented by this symbol. The <em>raw</em> object can either be a |
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590 * wrapper about primitive type (e.g. {@link Number}, {@link String}, {@link Character}, |
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591 * {@link Boolean}) or a <em>TruffleObject</em> representing more complex object from a |
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592 * language. The method can return <code>null</code>. |
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593 * |
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594 * @return the object or <code>null</code> |
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595 * @throws IOException in case it is not possible to obtain the value of the object |
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596 */ |
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597 public Object get() throws IOException { |
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598 waitForSymbol(); |
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599 exceptionCheck(result); |
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600 return result[0]; |
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601 } |
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602 |
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603 /** |
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604 * Invokes the symbol. If the symbol represents a function, then it should be invoked with |
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605 * provided arguments. If the symbol represents a field, then first argument (if provided) |
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606 * should set the value to the field; the return value should be the actual value of the |
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607 * field when the <code>invoke</code> method returns. |
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608 * |
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609 * @param thiz this/self in language that support such concept; use <code>null</code> to let |
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610 * the language use default this/self or ignore the value |
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611 * @param args arguments to pass when invoking the symbol |
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612 * @return symbol wrapper around the value returned by invoking the symbol, never |
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613 * <code>null</code> |
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614 * @throws IOException signals problem during execution |
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615 */ |
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616 public Symbol invoke(final Object thiz, final Object... args) throws IOException { |
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617 get(); |
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618 final Debugger[] fillIn = {debugger}; |
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619 final CountDownLatch done = new CountDownLatch(1); |
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620 final Object[] res = {null, null}; |
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621 executor.execute(new Runnable() { |
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622 @Override |
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623 public void run() { |
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624 invokeImpl(fillIn, thiz, args, res, done); |
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625 } |
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626 }); |
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627 exceptionCheck(res); |
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628 return new Symbol(language, res, done); |
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629 } |
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630 |
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631 @SuppressWarnings("try") |
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632 private void invokeImpl(Debugger[] fillIn, Object thiz, Object[] args, Object[] res, CountDownLatch done) { |
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633 try (final Closeable c = SPI.executionStart(TruffleVM.this, fillIn, null)) { |
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634 if (debugger == null) { |
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635 debugger = fillIn[0]; |
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636 } |
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637 List<Object> arr = new ArrayList<>(); |
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638 if (thiz == null && language != null) { |
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639 Object global = SPI.languageGlobal(SPI.findLanguage(TruffleVM.this, language.getClass())); |
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640 if (global != null) { |
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641 arr.add(global); |
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642 } |
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643 } else { |
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644 arr.add(thiz); |
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645 } |
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646 arr.addAll(Arrays.asList(args)); |
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647 for (;;) { |
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648 try { |
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649 if (target == null) { |
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650 target = SymbolInvokerImpl.createCallTarget(language, result[0], arr.toArray()); |
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651 } |
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652 res[0] = target.call(arr.toArray()); |
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653 break; |
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654 } catch (ArgumentsMishmashException ex) { |
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655 target = null; |
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656 } |
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657 } |
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658 } catch (IOException ex) { |
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659 res[1] = ex; |
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660 } catch (RuntimeException ex) { |
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661 res[1] = ex; |
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662 } finally { |
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663 done.countDown(); |
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664 } |
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665 } |
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666 |
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667 private void waitForSymbol() throws InterruptedIOException { |
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668 checkThread(); |
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669 try { |
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670 ready.await(); |
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671 } catch (InterruptedException ex) { |
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672 throw (InterruptedIOException) new InterruptedIOException(ex.getMessage()).initCause(ex); |
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673 } |
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674 } |
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675 } |
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676 |
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677 /** |
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678 * Description of a language registered in {@link TruffleVM Truffle virtual machine}. Languages |
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679 * are registered by {@link Registration} annotation which stores necessary information into a |
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680 * descriptor inside of the language's JAR file. When a new {@link TruffleVM} is created, it |
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681 * reads all available descriptors and creates {@link Language} objects to represent them. One |
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682 * can obtain a {@link #getName() name} or list of supported {@link #getMimeTypes() MIME types} |
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683 * for each language. The actual language implementation is not initialized until |
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684 * {@link TruffleVM#eval(java.lang.String, java.lang.String) a code is evaluated} in it. |
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685 */ |
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686 public final class Language { |
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687 private final Properties props; |
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688 private TruffleLanguage<?> impl; |
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689 private TruffleLanguage.Env env; |
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690 private final String prefix; |
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691 private String shortName; |
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692 |
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693 Language(String prefix, Properties props) { |
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694 this.prefix = prefix; |
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695 this.props = props; |
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696 } |
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697 |
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698 /** |
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699 * MIME types recognized by the language. |
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700 * |
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701 * @return returns immutable set of recognized MIME types |
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702 */ |
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703 public Set<String> getMimeTypes() { |
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704 TreeSet<String> ts = new TreeSet<>(); |
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705 for (int i = 0;; i++) { |
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706 String mt = props.getProperty(prefix + "mimeType." + i); |
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707 if (mt == null) { |
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708 break; |
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709 } |
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710 ts.add(mt); |
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711 } |
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712 return Collections.unmodifiableSet(ts); |
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713 } |
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714 |
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715 /** |
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716 * Human readable name of the language. Think of C, Ruby, JS, etc. |
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717 * |
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718 * @return string giving the language a name |
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719 */ |
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720 public String getName() { |
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721 return props.getProperty(prefix + "name"); |
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722 } |
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723 |
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724 /** |
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725 * Name of the language version. |
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726 * |
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727 * @return string specifying the language version |
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728 */ |
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729 public String getVersion() { |
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730 return props.getProperty(prefix + "version"); |
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731 } |
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732 |
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733 /** |
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734 * Human readable string that identifies the language and version. |
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735 * |
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736 * @return string describing the specific language version |
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737 */ |
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738 public String getShortName() { |
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739 if (shortName == null) { |
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740 shortName = getName() + "(" + getVersion() + ")"; |
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741 } |
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742 return shortName; |
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743 } |
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744 |
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745 TruffleLanguage<?> getImpl() { |
22133
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746 return getImpl(true); |
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747 } |
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748 |
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749 TruffleLanguage<?> getImpl(boolean create) { |
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750 if (impl == null && create) { |
22128
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751 String n = props.getProperty(prefix + "className"); |
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752 try { |
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753 impl = LanguageCache.find(n, loader()); |
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754 env = SPI.attachEnv(TruffleVM.this, impl, out, err, in); |
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755 } catch (Exception ex) { |
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756 throw new IllegalStateException("Cannot initialize " + getShortName() + " language with implementation " + n, ex); |
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757 } |
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758 } |
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759 return impl; |
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760 } |
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761 |
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762 @Override |
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763 public String toString() { |
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764 return "[" + getShortName() + " for " + getMimeTypes() + "]"; |
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765 } |
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766 |
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767 TruffleLanguage.Env getEnv() { |
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768 if (env == null) { |
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769 env = SPI.attachEnv(TruffleVM.this, impl, out, err, in); |
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770 } |
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771 return env; |
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772 } |
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773 } // end of Language |
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774 |
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775 // |
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776 // Accessor helper methods |
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777 // |
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778 |
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779 TruffleLanguage<?> findLanguage(Probe probe) { |
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780 Class<? extends TruffleLanguage> languageClazz = SPI.findLanguage(probe); |
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781 for (Map.Entry<String, Language> entrySet : langs.entrySet()) { |
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782 Language languageDescription = entrySet.getValue(); |
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783 if (languageClazz.isInstance(languageDescription.impl)) { |
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784 return languageDescription.impl; |
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785 } |
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786 } |
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787 throw new IllegalStateException("Cannot find language " + languageClazz + " among " + langs); |
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788 } |
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789 |
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790 Env findEnv(Class<? extends TruffleLanguage> languageClazz) { |
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791 for (Map.Entry<String, Language> entrySet : langs.entrySet()) { |
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792 Language languageDescription = entrySet.getValue(); |
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793 if (languageClazz.isInstance(languageDescription.impl)) { |
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794 return languageDescription.getEnv(); |
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795 } |
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796 } |
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797 throw new IllegalStateException("Cannot find language " + languageClazz + " among " + langs); |
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798 } |
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799 |
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800 static DebugSupportProvider findDebuggerSupport(TruffleLanguage<?> l) { |
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801 return SPI.getDebugSupport(l); |
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802 } |
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803 |
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804 private static class SPIAccessor extends Accessor { |
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805 @Override |
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806 public Object importSymbol(Object vmObj, TruffleLanguage<?> ownLang, String globalName) { |
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807 TruffleVM vm = (TruffleVM) vmObj; |
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808 Object g = vm.globals.get(globalName); |
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809 if (g != null) { |
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810 return g; |
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811 } |
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812 Set<Language> uniqueLang = new LinkedHashSet<>(vm.langs.values()); |
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813 for (Language dl : uniqueLang) { |
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814 TruffleLanguage<?> l = dl.getImpl(); |
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815 if (l == ownLang) { |
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816 continue; |
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817 } |
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818 Object obj = SPI.findExportedSymbol(dl.getEnv(), globalName, true); |
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819 if (obj != null) { |
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820 return obj; |
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821 } |
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822 } |
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823 for (Language dl : uniqueLang) { |
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824 TruffleLanguage<?> l = dl.getImpl(); |
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825 if (l == ownLang) { |
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826 continue; |
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827 } |
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828 Object obj = SPI.findExportedSymbol(dl.getEnv(), globalName, false); |
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829 if (obj != null) { |
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830 return obj; |
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831 } |
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832 } |
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833 return null; |
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834 } |
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835 |
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836 @Override |
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837 public Env attachEnv(Object obj, TruffleLanguage<?> language, Writer stdOut, Writer stdErr, Reader stdIn) { |
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838 TruffleVM vm = (TruffleVM) obj; |
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839 return super.attachEnv(vm, language, stdOut, stdErr, stdIn); |
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840 } |
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841 |
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842 @Override |
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843 public Object eval(TruffleLanguage<?> l, Source s) throws IOException { |
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844 return super.eval(l, s); |
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845 } |
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846 |
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847 @Override |
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848 public Object findExportedSymbol(TruffleLanguage.Env env, String globalName, boolean onlyExplicit) { |
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849 return super.findExportedSymbol(env, globalName, onlyExplicit); |
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850 } |
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851 |
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852 @Override |
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853 protected Object languageGlobal(TruffleLanguage.Env env) { |
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854 return super.languageGlobal(env); |
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855 } |
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856 |
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857 @Override |
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858 public ToolSupportProvider getToolSupport(TruffleLanguage<?> l) { |
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859 return super.getToolSupport(l); |
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860 } |
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861 |
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862 @Override |
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863 public DebugSupportProvider getDebugSupport(TruffleLanguage<?> l) { |
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864 return super.getDebugSupport(l); |
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865 } |
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866 |
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867 @Override |
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868 protected Class<? extends TruffleLanguage> findLanguage(Probe probe) { |
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869 return super.findLanguage(probe); |
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870 } |
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871 |
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872 @Override |
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873 protected Env findLanguage(Object obj, Class<? extends TruffleLanguage> languageClass) { |
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874 TruffleVM vm = (TruffleVM) obj; |
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875 return vm.findEnv(languageClass); |
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876 } |
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877 |
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878 @Override |
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879 protected Closeable executionStart(Object obj, Debugger[] fillIn, Source s) { |
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880 TruffleVM vm = (TruffleVM) obj; |
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881 return super.executionStart(vm, fillIn, s); |
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882 } |
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883 |
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884 @Override |
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885 protected void dispatchEvent(Object obj, Object event) { |
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886 TruffleVM vm = (TruffleVM) obj; |
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887 vm.dispatch(event); |
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888 } |
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889 } // end of SPIAccessor |
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890 } |