Mercurial > hg > truffle
annotate truffle/com.oracle.truffle.api.vm/src/com/oracle/truffle/api/vm/TruffleVM.java @ 22183:1421041175a7
Adding dispose() and TruffleLanguage.disposeContext to allow user request and languages explicitly free the resources
author | Jaroslav Tulach <jaroslav.tulach@oracle.com> |
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date | Mon, 21 Sep 2015 14:05:33 +0200 |
parents | 0480c4873a4a |
children | 2e7352f9ffa8 |
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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.CallTarget; |
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28 import com.oracle.truffle.api.TruffleLanguage; |
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29 import com.oracle.truffle.api.TruffleLanguage.Env; |
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30 import com.oracle.truffle.api.TruffleLanguage.Registration; |
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31 import com.oracle.truffle.api.debug.DebugSupportProvider; |
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32 import com.oracle.truffle.api.debug.Debugger; |
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33 import com.oracle.truffle.api.debug.ExecutionEvent; |
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34 import com.oracle.truffle.api.debug.SuspendedEvent; |
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35 import com.oracle.truffle.api.impl.Accessor; |
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36 import com.oracle.truffle.api.instrument.Probe; |
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37 import com.oracle.truffle.api.instrument.ToolSupportProvider; |
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38 import com.oracle.truffle.api.interop.TruffleObject; |
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39 import com.oracle.truffle.api.interop.java.JavaInterop; |
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40 import com.oracle.truffle.api.source.Source; |
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41 import java.io.Closeable; |
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42 import java.io.File; |
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43 import java.io.IOException; |
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44 import java.io.InputStream; |
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45 import java.io.InterruptedIOException; |
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46 import java.io.OutputStream; |
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47 import java.io.Reader; |
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48 import java.io.Writer; |
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Make sure the proper TruffleVM execution context is re-set before invoking an operation on a JavaInterop wrapper obtained via Symbol.as method.
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49 import java.lang.reflect.InvocationHandler; |
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50 import java.lang.reflect.Method; |
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51 import java.net.URI; |
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52 import java.net.URL; |
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53 import java.net.URLConnection; |
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54 import java.nio.file.Files; |
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55 import java.util.ArrayList; |
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56 import java.util.Arrays; |
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57 import java.util.Collections; |
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58 import java.util.HashMap; |
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59 import java.util.LinkedHashSet; |
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60 import java.util.List; |
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61 import java.util.Map; |
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62 import java.util.Set; |
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63 import java.util.concurrent.CountDownLatch; |
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64 import java.util.concurrent.Executor; |
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65 import java.util.logging.Level; |
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66 import java.util.logging.Logger; |
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67 |
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68 /** |
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69 * <em>Virtual machine</em> for Truffle based languages. Term virtual machine is a bit overloaded, |
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70 * so don't think of <em>Java virtual machine</em> here - while we are running and using |
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71 * {@link TruffleVM} inside of a <em>JVM</em> there can be multiple instances (some would say |
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72 * tenants) of {@link TruffleVM} running next to each other in a single <em>JVM</em> with a complete |
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73 * mutual isolation. There is 1:N mapping between <em>JVM</em> and {@link TruffleVM}. |
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74 * <p> |
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75 * It would not be correct to think of a {@link TruffleVM} as a runtime for a single Truffle |
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76 * language (Ruby, Python, R, C, JavaScript, etc.) either. {@link TruffleVM} can host as many of |
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77 * Truffle languages as {@link Registration registered on a class path} of your <em>JVM</em> |
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78 * application. {@link TruffleVM} orchestrates these languages, manages exchange of objects and |
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79 * calls among them. While it may happen that there is just one activated language inside of a |
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80 * {@link TruffleVM}, the greatest strength of {@link TruffleVM} is in interoperability between all |
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81 * Truffle languages. There is 1:N mapping between {@link TruffleVM} and {@link TruffleLanguage |
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82 * Truffle language implementations}. |
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83 * <p> |
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84 * Use {@link #newVM()} to create new isolated virtual machine ready for execution of various |
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85 * languages. All the languages in a single virtual machine see each other exported global symbols |
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86 * and can cooperate. Use {@link #newVM()} multiple times to create different, isolated virtual |
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87 * machines completely separated from each other. |
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88 * <p> |
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89 * Once instantiated use {@link #eval(java.net.URI)} with a reference to a file or URL or directly |
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90 * pass code snippet into the virtual machine via {@link #eval(java.lang.String, java.lang.String)}. |
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91 * Support for individual languages is initialized on demand - e.g. once a file of certain MIME type |
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92 * is about to be processed, its appropriate engine (if found), is initialized. Once an engine gets |
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93 * initialized, it remains so, until the virtual machine isn't garbage collected. |
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94 * <p> |
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95 * The <code>TruffleVM</code> is single-threaded and tries to enforce that. It records the thread it |
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96 * has been {@link Builder#build() created} by and checks that all subsequent calls are coming from |
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97 * the same thread. There is 1:1 mapping between {@link TruffleVM} and a thread that can tell it |
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98 * what to do. |
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99 */ |
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100 @SuppressWarnings("rawtypes") |
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101 public final class TruffleVM { |
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102 static final Logger LOG = Logger.getLogger(TruffleVM.class.getName()); |
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103 private static final SPIAccessor SPI = new SPIAccessor(); |
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104 private final Thread initThread; |
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105 private final Executor executor; |
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106 private final Map<String, Language> langs; |
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107 private final InputStream in; |
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108 private final OutputStream err; |
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109 private final OutputStream out; |
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110 private final EventConsumer<?>[] handlers; |
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111 private final Map<String, Object> globals; |
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112 private Debugger debugger; |
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113 private boolean disposed; |
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114 |
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115 /** |
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116 * Private & temporary only constructor. |
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117 */ |
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118 private TruffleVM() { |
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119 this.initThread = null; |
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120 this.in = null; |
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121 this.err = null; |
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122 this.out = null; |
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123 this.langs = null; |
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124 this.handlers = null; |
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125 this.globals = null; |
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126 this.executor = null; |
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127 } |
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128 |
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129 /** |
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130 * Real constructor used from the builder. |
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131 */ |
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132 private TruffleVM(Executor executor, Map<String, Object> globals, OutputStream out, OutputStream err, InputStream in, EventConsumer<?>[] handlers) { |
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133 this.executor = executor; |
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134 this.out = out; |
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135 this.err = err; |
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136 this.in = in; |
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137 this.handlers = handlers; |
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138 this.initThread = Thread.currentThread(); |
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139 this.globals = new HashMap<>(globals); |
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140 Map<String, Language> map = new HashMap<>(); |
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141 for (Map.Entry<String, LanguageCache> en : LanguageCache.languages().entrySet()) { |
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142 map.put(en.getKey(), new Language(en.getValue())); |
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143 } |
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144 this.langs = map; |
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145 } |
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146 |
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147 /** |
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148 * Creation of new Truffle virtual machine. Use the {@link Builder} methods to configure your |
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149 * virtual machine and then create one using {@link Builder#build()}: |
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150 * |
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151 * <pre> |
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152 * {@link TruffleVM} vm = {@link TruffleVM}.{@link TruffleVM#newVM() newVM()} |
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153 * .{@link Builder#setOut(java.io.OutputStream) setOut}({@link OutputStream yourOutput}) |
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154 * .{@link Builder#setErr(java.io.OutputStream) setrr}({@link OutputStream yourOutput}) |
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155 * .{@link Builder#setIn(java.io.InputStream) setIn}({@link InputStream yourInput}) |
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156 * .{@link Builder#build() build()}; |
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157 * </pre> |
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158 * |
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159 * It searches for {@link Registration languages registered} in the system class loader and |
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160 * makes them available for later evaluation via |
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161 * {@link #eval(java.lang.String, java.lang.String)} methods. |
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162 * |
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163 * @return new, isolated virtual machine with pre-registered languages |
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164 */ |
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165 public static TruffleVM.Builder newVM() { |
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166 // making Builder non-static inner class is a |
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167 // nasty trick to avoid the Builder class to appear |
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168 // in Javadoc next to TruffleVM class |
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169 TruffleVM vm = new TruffleVM(); |
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170 return vm.new Builder(); |
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171 } |
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172 |
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173 /** |
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174 * Builder for a new {@link TruffleVM}. Call various configuration methods in a chain and at the |
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175 * end create new {@link TruffleVM virtual machine}: |
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176 * |
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177 * <pre> |
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178 * {@link TruffleVM} vm = {@link TruffleVM}.{@link TruffleVM#newVM() newVM()} |
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179 * .{@link Builder#setOut(java.io.OutputStream) setOut}({@link OutputStream yourOutput}) |
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180 * .{@link Builder#setErr(java.io.OutputStream) setrr}({@link OutputStream yourOutput}) |
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181 * .{@link Builder#setIn(java.io.InputStream) setIn}({@link InputStream yourInput}) |
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182 * .{@link Builder#build() build()}; |
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183 * </pre> |
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184 */ |
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185 public final class Builder { |
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186 private OutputStream out; |
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187 private OutputStream err; |
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188 private InputStream in; |
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189 private final List<EventConsumer<?>> handlers = new ArrayList<>(); |
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190 private final Map<String, Object> globals = new HashMap<>(); |
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191 private Executor executor; |
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192 |
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193 Builder() { |
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194 } |
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195 |
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196 /** |
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197 * Changes the default output for languages running in <em>to be created</em> |
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198 * {@link TruffleVM virtual machine}. The default is to use {@link System#out}. |
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199 * |
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200 * @param os the stream to use as output |
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201 * @return instance of this builder |
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202 */ |
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203 public Builder setOut(OutputStream os) { |
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204 out = os; |
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205 return this; |
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206 } |
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207 |
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208 /** |
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209 * @deprecated does nothing |
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210 */ |
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211 @Deprecated |
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212 @SuppressWarnings("unused") |
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213 public Builder stdOut(Writer w) { |
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214 return this; |
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215 } |
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216 |
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217 /** |
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218 * Changes the error output for languages running in <em>to be created</em> |
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219 * {@link TruffleVM virtual machine}. The default is to use {@link System#err}. |
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220 * |
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221 * @param os the stream to use as output |
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222 * @return instance of this builder |
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223 */ |
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224 public Builder setErr(OutputStream os) { |
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225 err = os; |
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226 return this; |
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227 } |
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228 |
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229 /** |
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230 * @deprecated does nothing |
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231 */ |
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232 @Deprecated |
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233 @SuppressWarnings("unused") |
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234 public Builder stdErr(Writer w) { |
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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 * Changes the default input for languages running in <em>to be created</em> |
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240 * {@link TruffleVM virtual machine}. The default is to use {@link System#in}. |
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241 * |
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242 * @param is the stream to use as input |
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243 * @return instance of this builder |
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244 */ |
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245 public Builder setIn(InputStream is) { |
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246 in = is; |
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247 return this; |
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248 } |
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249 |
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250 /** |
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251 * @deprecated does nothing |
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252 */ |
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253 @Deprecated |
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254 @SuppressWarnings("unused") |
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255 public Builder stdIn(Reader r) { |
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256 return this; |
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257 } |
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258 |
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259 /** |
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260 * Registers another instance of {@link EventConsumer} into the to be created |
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261 * {@link TruffleVM}. |
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262 * |
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263 * @param handler the handler to register |
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264 * @return instance of this builder |
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265 */ |
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266 public Builder onEvent(EventConsumer<?> handler) { |
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267 handler.getClass(); |
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268 handlers.add(handler); |
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269 return this; |
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270 } |
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271 |
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272 /** |
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273 * Adds global named symbol into the configuration of to-be-built {@link TruffleVM}. This |
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274 * symbol will be accessible to all languages via {@link Env#importSymbol(java.lang.String)} |
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275 * and will take precedence over {@link TruffleLanguage#findExportedSymbol symbols exported |
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276 * by languages itself}. Repeated use of <code>globalSymbol</code> is possible; later |
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277 * definition of the same name overrides the previous one. |
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278 * |
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279 * @param name name of the symbol to register |
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280 * @param obj value of the object - expected to be primitive wrapper, {@link String} or |
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281 * <code>TruffleObject</code> for mutual inter-operability |
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282 * @return instance of this builder |
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283 * @see TruffleVM#findGlobalSymbol(java.lang.String) |
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284 */ |
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285 public Builder globalSymbol(String name, Object obj) { |
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286 globals.put(name, obj); |
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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 * Provides own executor for running {@link TruffleVM} scripts. By default |
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292 * {@link TruffleVM#eval(com.oracle.truffle.api.source.Source)} and |
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293 * {@link Symbol#invoke(java.lang.Object, java.lang.Object...)} are executed synchronously |
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294 * in the calling thread. Sometimes, however it is more beneficial to run them |
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295 * asynchronously - the easiest way to do so is to provide own executor when configuring the |
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296 * { {@link #executor(java.util.concurrent.Executor) the builder}. The executor is expected |
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297 * to execute all {@link Runnable runnables} passed into its |
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298 * {@link Executor#execute(java.lang.Runnable)} method in the order they arrive and in a |
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299 * single (yet arbitrary) thread. |
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300 * |
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301 * @param executor the executor to use for internal execution inside the {@link #build() to |
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302 * be created} {@link TruffleVM} |
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303 * @return instance of this builder |
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304 */ |
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305 @SuppressWarnings("hiding") |
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306 public Builder executor(Executor executor) { |
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307 this.executor = executor; |
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308 return this; |
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309 } |
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310 |
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311 /** |
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312 * Creates the {@link TruffleVM Truffle virtual machine}. The configuration is taken from |
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313 * values passed into configuration methods in this class. |
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314 * |
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315 * @return new, isolated virtual machine with pre-registered languages |
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316 */ |
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317 public TruffleVM build() { |
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318 if (out == null) { |
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319 out = System.out; |
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320 } |
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321 if (err == null) { |
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322 err = System.err; |
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323 } |
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324 if (in == null) { |
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325 in = System.in; |
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326 } |
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327 Executor nonNullExecutor = executor != null ? executor : new Executor() { |
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328 @Override |
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329 public void execute(Runnable command) { |
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330 command.run(); |
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331 } |
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332 }; |
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333 return new TruffleVM(nonNullExecutor, globals, out, err, in, handlers.toArray(new EventConsumer[0])); |
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334 } |
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335 } |
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336 |
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337 /** |
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338 * Descriptions of languages supported in this Truffle virtual machine. |
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339 * |
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340 * @return an immutable map with keys being MIME types and values the {@link Language |
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341 * descriptions} of associated languages |
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342 */ |
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343 public Map<String, Language> getLanguages() { |
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344 return Collections.unmodifiableMap(langs); |
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345 } |
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346 |
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347 /** |
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348 * Evaluates file located on a given URL. Is equivalent to loading the content of a file and |
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349 * executing it via {@link #eval(java.lang.String, java.lang.String)} with a MIME type guess |
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350 * based on the file's extension and/or content. |
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351 * |
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352 * @param location the location of a file to execute |
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353 * @return result of a processing the file, possibly <code>null</code> |
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354 * @throws IOException exception to signal I/O problems or problems with processing the file's |
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355 * content |
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356 * @deprecated use {@link #eval(com.oracle.truffle.api.source.Source)} |
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357 */ |
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358 @Deprecated |
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359 public Object eval(URI location) throws IOException { |
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360 checkThread(); |
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361 Source s; |
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362 String mimeType; |
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363 if (location.getScheme().equals("file")) { |
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364 File file = new File(location); |
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365 s = Source.fromFileName(file.getPath(), true); |
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366 if (file.getName().endsWith(".c")) { |
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367 mimeType = "text/x-c"; |
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368 } else if (file.getName().endsWith(".sl")) { |
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369 mimeType = "application/x-sl"; |
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370 } else if (file.getName().endsWith(".R") || file.getName().endsWith(".r")) { |
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371 mimeType = "application/x-r"; |
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372 } else { |
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373 mimeType = Files.probeContentType(file.toPath()); |
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374 } |
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375 } else { |
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376 URL url = location.toURL(); |
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377 s = Source.fromURL(url, location.toString()); |
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378 URLConnection conn = url.openConnection(); |
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379 mimeType = conn.getContentType(); |
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380 } |
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381 Language l = langs.get(mimeType); |
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382 if (l == null) { |
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383 throw new IOException("No language for " + location + " with MIME type " + mimeType + " found. Supported types: " + langs.keySet()); |
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384 } |
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385 return eval(l, s).get(); |
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386 } |
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387 |
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388 /** |
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389 * Evaluates code snippet. Chooses a language registered for a given MIME type (throws |
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390 * {@link IOException} if there is none). And passes the specified code to it for execution. |
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391 * |
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392 * @param mimeType MIME type of the code snippet - chooses the right language |
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393 * @param reader the source of code snippet to execute |
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394 * @return result of an execution, possibly <code>null</code> |
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395 * @throws IOException thrown to signal errors while processing the code |
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396 * @deprecated use {@link #eval(com.oracle.truffle.api.source.Source)} |
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397 */ |
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398 @Deprecated |
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399 public Object eval(String mimeType, Reader reader) throws IOException { |
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400 checkThread(); |
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401 Language l = langs.get(mimeType); |
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402 if (l == null) { |
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403 throw new IOException("No language for MIME type " + mimeType + " found. Supported types: " + langs.keySet()); |
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404 } |
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405 return eval(l, Source.fromReader(reader, mimeType)).get(); |
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406 } |
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407 |
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408 /** |
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409 * Evaluates code snippet. Chooses a language registered for a given MIME type (throws |
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410 * {@link IOException} if there is none). And passes the specified code to it for execution. |
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411 * |
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412 * @param mimeType MIME type of the code snippet - chooses the right language |
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413 * @param code the code snippet to execute |
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414 * @return result of an execution, possibly <code>null</code> |
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415 * @throws IOException thrown to signal errors while processing the code |
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416 * @deprecated use {@link #eval(com.oracle.truffle.api.source.Source)} |
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417 */ |
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418 @Deprecated |
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419 public Object eval(String mimeType, String code) throws IOException { |
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420 checkThread(); |
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421 Language l = langs.get(mimeType); |
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422 if (l == null) { |
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423 throw new IOException("No language for MIME type " + mimeType + " found. Supported types: " + langs.keySet()); |
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424 } |
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425 return eval(l, Source.fromText(code, mimeType)).get(); |
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426 } |
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427 |
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428 /** |
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429 * Evaluates provided source. Chooses language registered for a particular |
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430 * {@link Source#getMimeType() MIME type} (throws {@link IOException} if there is none). The |
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431 * language is then allowed to parse and execute the source. |
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432 * |
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433 * @param source code snippet to execute |
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434 * @return a {@link Symbol} object that holds result of an execution, never <code>null</code> |
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435 * @throws IOException thrown to signal errors while processing the code |
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436 */ |
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437 public Symbol eval(Source source) throws IOException { |
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438 String mimeType = source.getMimeType(); |
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439 checkThread(); |
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440 Language l = langs.get(mimeType); |
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441 if (l == null) { |
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442 throw new IOException("No language for MIME type " + mimeType + " found. Supported types: " + langs.keySet()); |
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443 } |
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444 return eval(l, source); |
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445 } |
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446 |
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447 /** |
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448 * Dispose instance of this engine. A user can explicitly |
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449 * {@link TruffleLanguage#disposeContext(java.lang.Object) dispose all resources} allocated by |
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450 * the languages active in this engine, when it is known the system is not going to be used in |
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451 * the future. |
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452 * <p> |
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453 * Calling any other method of this class after the dispose has been done yields an |
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454 * {@link IllegalStateException}. |
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455 */ |
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456 public void dispose() { |
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457 checkThread(); |
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458 disposed = true; |
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459 executor.execute(new Runnable() { |
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460 @Override |
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461 public void run() { |
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462 for (Language language : getLanguages().values()) { |
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463 TruffleLanguage<?> impl = language.getImpl(false); |
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464 if (impl != null) { |
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465 try { |
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466 SPI.dispose(impl, language.getEnv(true)); |
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467 } catch (Exception | Error ex) { |
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468 LOG.log(Level.SEVERE, "Error disposing " + impl, ex); |
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469 } |
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470 } |
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471 } |
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472 } |
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473 }); |
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474 } |
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475 |
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476 private Symbol eval(final Language l, final Source s) throws IOException { |
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477 final Debugger[] fillIn = {debugger}; |
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478 final Object[] result = {null, null}; |
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479 final CountDownLatch ready = new CountDownLatch(1); |
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480 final TruffleLanguage[] lang = {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 evalImpl(fillIn, lang, s, result, l, ready); |
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485 } |
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486 }); |
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487 exceptionCheck(result); |
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488 return new Symbol(lang[0], result, ready); |
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489 } |
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490 |
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491 @SuppressWarnings("try") |
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492 private void evalImpl(Debugger[] fillIn, TruffleLanguage<?>[] fillLang, Source s, Object[] result, Language l, CountDownLatch ready) { |
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493 try (Closeable d = SPI.executionStart(this, fillIn, s)) { |
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494 TruffleLanguage<?> langImpl = l.getImpl(true); |
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495 fillLang[0] = langImpl; |
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496 TruffleVM.findDebuggerSupport(langImpl); |
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497 if (debugger == null) { |
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498 debugger = fillIn[0]; |
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499 } |
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500 result[0] = SPI.eval(langImpl, s); |
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501 } catch (IOException ex) { |
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502 result[1] = ex; |
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503 } finally { |
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504 ready.countDown(); |
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505 } |
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506 } |
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507 |
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508 /** |
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509 * Looks global symbol provided by one of initialized languages up. First of all execute your |
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510 * program via one of your {@link #eval(java.lang.String, java.lang.String)} and then look |
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511 * expected symbol up using this method. |
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512 * <p> |
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513 * The names of the symbols are language dependent, but for example the Java language bindings |
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514 * follow the specification for method references: |
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515 * <ul> |
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516 * <li>"java.lang.Exception::new" is a reference to constructor of {@link Exception} |
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517 * <li>"java.lang.Integer::valueOf" is a reference to static method in {@link Integer} class |
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518 * </ul> |
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519 * Once an symbol is obtained, it remembers values for fast access and is ready for being |
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520 * invoked. |
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521 * |
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522 * @param globalName the name of the symbol to find |
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523 * @return found symbol or <code>null</code> if it has not been found |
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524 */ |
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525 public Symbol findGlobalSymbol(final String globalName) { |
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526 checkThread(); |
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527 final TruffleLanguage<?>[] lang = {null}; |
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528 final Object[] obj = {globals.get(globalName), null}; |
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529 final CountDownLatch ready = new CountDownLatch(1); |
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530 if (obj[0] == null) { |
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531 executor.execute(new Runnable() { |
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532 @Override |
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533 public void run() { |
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534 findGlobalSymbolImpl(obj, globalName, lang, ready); |
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535 } |
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536 }); |
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537 try { |
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538 ready.await(); |
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539 } catch (InterruptedException ex) { |
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540 LOG.log(Level.SEVERE, null, ex); |
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541 } |
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542 } else { |
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543 ready.countDown(); |
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544 } |
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545 return obj[0] == null ? null : new Symbol(lang[0], obj, ready); |
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546 } |
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547 |
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548 private void findGlobalSymbolImpl(Object[] obj, String globalName, TruffleLanguage<?>[] lang, CountDownLatch ready) { |
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549 if (obj[0] == null) { |
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550 for (Language dl : langs.values()) { |
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551 TruffleLanguage.Env env = dl.getEnv(false); |
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552 if (env == null) { |
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553 continue; |
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554 } |
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555 obj[0] = SPI.findExportedSymbol(env, globalName, true); |
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556 if (obj[0] != null) { |
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557 lang[0] = dl.getImpl(true); |
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558 break; |
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559 } |
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560 } |
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561 } |
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562 if (obj[0] == null) { |
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563 for (Language dl : langs.values()) { |
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564 TruffleLanguage.Env env = dl.getEnv(false); |
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565 if (env == null) { |
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566 continue; |
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567 } |
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568 obj[0] = SPI.findExportedSymbol(env, globalName, true); |
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569 if (obj[0] != null) { |
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570 lang[0] = dl.getImpl(true); |
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571 break; |
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572 } |
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573 } |
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574 } |
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575 ready.countDown(); |
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576 } |
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577 |
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578 private void checkThread() { |
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579 if (initThread != Thread.currentThread()) { |
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580 throw new IllegalStateException("TruffleVM created on " + initThread.getName() + " but used on " + Thread.currentThread().getName()); |
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581 } |
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582 if (disposed) { |
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583 throw new IllegalStateException("Engine has already been disposed"); |
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584 } |
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585 } |
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586 |
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587 @SuppressWarnings("unchecked") |
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588 void dispatch(Object ev) { |
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589 Class type = ev.getClass(); |
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590 if (type == SuspendedEvent.class) { |
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591 dispatchSuspendedEvent((SuspendedEvent) ev); |
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592 } |
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593 if (type == ExecutionEvent.class) { |
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594 dispatchExecutionEvent((ExecutionEvent) ev); |
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595 } |
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596 dispatch(type, ev); |
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597 } |
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598 |
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599 @SuppressWarnings("unused") |
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600 void dispatchSuspendedEvent(SuspendedEvent event) { |
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601 } |
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602 |
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603 @SuppressWarnings("unused") |
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604 void dispatchExecutionEvent(ExecutionEvent event) { |
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605 } |
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606 |
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607 @SuppressWarnings("unchecked") |
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608 <Event> void dispatch(Class<Event> type, Event event) { |
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609 for (EventConsumer handler : handlers) { |
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610 if (handler.type == type) { |
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611 handler.on(event); |
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612 } |
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613 } |
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614 } |
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615 |
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616 static void exceptionCheck(Object[] result) throws RuntimeException, IOException { |
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617 if (result[1] instanceof IOException) { |
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618 throw (IOException) result[1]; |
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619 } |
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620 if (result[1] instanceof RuntimeException) { |
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621 throw (RuntimeException) result[1]; |
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622 } |
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623 } |
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624 |
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625 /** |
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626 * Represents {@link TruffleVM#findGlobalSymbol(java.lang.String) global symbol} provided by one |
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627 * of the initialized languages in {@link TruffleVM Truffle virtual machine}. |
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628 */ |
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629 public class Symbol { |
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630 private final TruffleLanguage<?> language; |
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631 private final Object[] result; |
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632 private final CountDownLatch ready; |
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633 private CallTarget target; |
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634 |
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635 Symbol(TruffleLanguage<?> language, Object[] result, CountDownLatch ready) { |
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636 this.language = language; |
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637 this.result = result; |
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638 this.ready = ready; |
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639 } |
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640 |
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641 /** |
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642 * Obtains the object represented by this symbol. The <em>raw</em> object can either be a |
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643 * wrapper about primitive type (e.g. {@link Number}, {@link String}, {@link Character}, |
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644 * {@link Boolean}) or a <em>TruffleObject</em> representing more complex object from a |
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645 * language. The method can return <code>null</code>. |
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646 * |
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647 * @return the object or <code>null</code> |
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648 * @throws IOException in case it is not possible to obtain the value of the object |
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649 */ |
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650 public Object get() throws IOException { |
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651 waitForSymbol(); |
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652 exceptionCheck(result); |
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653 return result[0]; |
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654 } |
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655 |
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656 /** |
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657 * Obtains Java view of the object represented by this symbol. The method basically |
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658 * delegates to |
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659 * {@link JavaInterop#asJavaObject(java.lang.Class, com.oracle.truffle.api.interop.TruffleObject)} |
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660 * just handles primitive types as well. |
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661 * |
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662 * @param <T> the type of the view one wants to obtain |
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663 * @param representation the class of the view interface (it has to be an interface) |
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664 * @return instance of the view wrapping the object of this symbol |
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665 * @throws IOException in case it is not possible to obtain the value of the object |
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666 * @throws ClassCastException if the value cannot be converted to desired view |
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667 */ |
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668 public <T> T as(Class<T> representation) throws IOException { |
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669 Object obj = get(); |
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670 if (representation.isInstance(obj)) { |
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671 return representation.cast(obj); |
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672 } |
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673 T wrapper = JavaInterop.asJavaObject(representation, (TruffleObject) obj); |
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674 return JavaWrapper.create(representation, wrapper, this); |
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675 } |
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676 |
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677 /** |
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678 * Invokes the symbol. If the symbol represents a function, then it should be invoked with |
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679 * provided arguments. If the symbol represents a field, then first argument (if provided) |
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680 * should set the value to the field; the return value should be the actual value of the |
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681 * field when the <code>invoke</code> method returns. |
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682 * |
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683 * @param thiz this/self in language that support such concept; use <code>null</code> to let |
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684 * the language use default this/self or ignore the value |
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685 * @param args arguments to pass when invoking the symbol |
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686 * @return symbol wrapper around the value returned by invoking the symbol, never |
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687 * <code>null</code> |
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688 * @throws IOException signals problem during execution |
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689 */ |
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690 public Symbol invoke(final Object thiz, final Object... args) throws IOException { |
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691 get(); |
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692 final Debugger[] fillIn = {debugger}; |
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693 final CountDownLatch done = new CountDownLatch(1); |
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694 final Object[] res = {null, null}; |
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695 executor.execute(new Runnable() { |
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696 @Override |
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697 public void run() { |
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698 invokeImpl(fillIn, thiz, args, res, done); |
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699 } |
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700 }); |
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701 exceptionCheck(res); |
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702 return new Symbol(language, res, done); |
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703 } |
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704 |
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705 @SuppressWarnings("try") |
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706 final Symbol invokeProxy(final InvocationHandler chain, final Object wrapper, final Method method, final Object[] args) throws IOException { |
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707 final Debugger[] fillIn = {debugger}; |
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708 final CountDownLatch done = new CountDownLatch(1); |
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709 final Object[] res = {null, null}; |
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710 executor.execute(new Runnable() { |
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711 @Override |
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712 public void run() { |
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713 try (final Closeable c = SPI.executionStart(TruffleVM.this, fillIn, null)) { |
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714 if (debugger == null) { |
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715 debugger = fillIn[0]; |
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716 } |
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717 res[0] = chain.invoke(wrapper, method, args); |
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718 } catch (IOException ex) { |
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719 res[1] = ex; |
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720 } catch (Throwable ex) { |
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721 res[1] = ex; |
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722 } finally { |
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723 done.countDown(); |
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724 } |
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725 } |
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726 }); |
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727 exceptionCheck(res); |
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728 return new Symbol(language, res, done); |
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729 } |
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730 |
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731 @SuppressWarnings("try") |
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732 private void invokeImpl(Debugger[] fillIn, Object thiz, Object[] args, Object[] res, CountDownLatch done) { |
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733 try (final Closeable c = SPI.executionStart(TruffleVM.this, fillIn, null)) { |
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734 if (debugger == null) { |
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735 debugger = fillIn[0]; |
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736 } |
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737 List<Object> arr = new ArrayList<>(); |
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738 if (thiz == null && language != null) { |
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739 Object global = SPI.languageGlobal(SPI.findLanguage(TruffleVM.this, language.getClass())); |
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740 if (global != null) { |
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741 arr.add(global); |
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742 } |
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743 } else { |
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744 arr.add(thiz); |
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745 } |
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746 arr.addAll(Arrays.asList(args)); |
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747 for (;;) { |
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748 try { |
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749 if (target == null) { |
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750 target = SymbolInvokerImpl.createCallTarget(language, result[0], arr.toArray()); |
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751 } |
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752 res[0] = target.call(arr.toArray()); |
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753 break; |
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754 } catch (ArgumentsMishmashException ex) { |
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755 target = null; |
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756 } |
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757 } |
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758 } catch (IOException ex) { |
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759 res[1] = ex; |
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760 } catch (RuntimeException ex) { |
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761 res[1] = ex; |
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762 } finally { |
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763 done.countDown(); |
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764 } |
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765 } |
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766 |
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767 private void waitForSymbol() throws InterruptedIOException { |
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768 checkThread(); |
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769 try { |
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770 ready.await(); |
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771 } catch (InterruptedException ex) { |
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772 throw (InterruptedIOException) new InterruptedIOException(ex.getMessage()).initCause(ex); |
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773 } |
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774 } |
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775 } |
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776 |
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777 /** |
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778 * Description of a language registered in {@link TruffleVM Truffle virtual machine}. Languages |
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779 * are registered by {@link Registration} annotation which stores necessary information into a |
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780 * descriptor inside of the language's JAR file. When a new {@link TruffleVM} is created, it |
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781 * reads all available descriptors and creates {@link Language} objects to represent them. One |
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782 * can obtain a {@link #getName() name} or list of supported {@link #getMimeTypes() MIME types} |
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783 * for each language. The actual language implementation is not initialized until |
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784 * {@link TruffleVM#eval(java.lang.String, java.lang.String) a code is evaluated} in it. |
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785 */ |
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786 public final class Language { |
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787 private final LanguageCache info; |
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788 private TruffleLanguage.Env env; |
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789 |
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790 Language(LanguageCache info) { |
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791 this.info = info; |
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792 } |
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793 |
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794 /** |
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795 * MIME types recognized by the language. |
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796 * |
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797 * @return returns immutable set of recognized MIME types |
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798 */ |
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799 public Set<String> getMimeTypes() { |
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800 return info.getMimeTypes(); |
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801 } |
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802 |
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803 /** |
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804 * Human readable name of the language. Think of C, Ruby, JS, etc. |
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805 * |
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806 * @return string giving the language a name |
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807 */ |
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808 public String getName() { |
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809 return info.getName(); |
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810 } |
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811 |
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812 /** |
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813 * Name of the language version. |
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814 * |
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815 * @return string specifying the language version |
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816 */ |
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817 public String getVersion() { |
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818 return info.getVersion(); |
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819 } |
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820 |
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821 /** |
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822 * Human readable string that identifies the language and version. |
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823 * |
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824 * @return string describing the specific language version |
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825 */ |
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826 public String getShortName() { |
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827 return getName() + "(" + getVersion() + ")"; |
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828 } |
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829 |
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830 TruffleLanguage<?> getImpl(boolean create) { |
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831 getEnv(create); |
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832 return info.getImpl(false); |
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833 } |
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834 |
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835 TruffleLanguage.Env getEnv(boolean create) { |
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836 if (env == null && create) { |
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837 env = SPI.attachEnv(TruffleVM.this, info.getImpl(true), out, err, in); |
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838 } |
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839 return env; |
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840 } |
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841 |
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842 @Override |
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843 public String toString() { |
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844 return "[" + getShortName() + " for " + getMimeTypes() + "]"; |
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845 } |
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846 } // end of Language |
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847 |
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848 // |
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849 // Accessor helper methods |
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850 // |
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851 |
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852 TruffleLanguage<?> findLanguage(Probe probe) { |
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853 Class<? extends TruffleLanguage> languageClazz = SPI.findLanguage(probe); |
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854 for (Map.Entry<String, Language> entrySet : langs.entrySet()) { |
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855 Language languageDescription = entrySet.getValue(); |
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856 final TruffleLanguage<?> impl = languageDescription.getImpl(false); |
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857 if (languageClazz.isInstance(impl)) { |
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858 return impl; |
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859 } |
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860 } |
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861 throw new IllegalStateException("Cannot find language " + languageClazz + " among " + langs); |
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862 } |
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863 |
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864 Env findEnv(Class<? extends TruffleLanguage> languageClazz) { |
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865 for (Map.Entry<String, Language> entrySet : langs.entrySet()) { |
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866 Language languageDescription = entrySet.getValue(); |
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867 Env env = languageDescription.getEnv(false); |
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868 if (env != null && languageClazz.isInstance(languageDescription.getImpl(false))) { |
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869 return env; |
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870 } |
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871 } |
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872 throw new IllegalStateException("Cannot find language " + languageClazz + " among " + langs); |
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873 } |
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874 |
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875 static DebugSupportProvider findDebuggerSupport(TruffleLanguage<?> l) { |
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876 return SPI.getDebugSupport(l); |
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877 } |
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878 |
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879 private static class SPIAccessor extends Accessor { |
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880 @Override |
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881 public Object importSymbol(Object vmObj, TruffleLanguage<?> ownLang, String globalName) { |
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882 TruffleVM vm = (TruffleVM) vmObj; |
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883 Object g = vm.globals.get(globalName); |
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884 if (g != null) { |
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885 return g; |
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886 } |
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887 Set<Language> uniqueLang = new LinkedHashSet<>(vm.langs.values()); |
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888 for (Language dl : uniqueLang) { |
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889 TruffleLanguage<?> l = dl.getImpl(false); |
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890 TruffleLanguage.Env env = dl.getEnv(false); |
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891 if (l == ownLang || l == null || env == null) { |
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892 continue; |
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893 } |
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894 Object obj = SPI.findExportedSymbol(env, globalName, true); |
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895 if (obj != null) { |
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896 return obj; |
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897 } |
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898 } |
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899 for (Language dl : uniqueLang) { |
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900 TruffleLanguage<?> l = dl.getImpl(false); |
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901 TruffleLanguage.Env env = dl.getEnv(false); |
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902 if (l == ownLang || l == null || env == null) { |
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903 continue; |
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904 } |
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905 Object obj = SPI.findExportedSymbol(env, globalName, false); |
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906 if (obj != null) { |
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907 return obj; |
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908 } |
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909 } |
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910 return null; |
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911 } |
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912 |
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913 @Override |
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914 protected Env attachEnv(Object obj, TruffleLanguage<?> language, OutputStream stdOut, OutputStream stdErr, InputStream stdIn) { |
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915 TruffleVM vm = (TruffleVM) obj; |
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916 return super.attachEnv(vm, language, stdOut, stdErr, stdIn); |
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917 } |
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918 |
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919 @Override |
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920 public Object eval(TruffleLanguage<?> l, Source s) throws IOException { |
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921 return super.eval(l, s); |
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922 } |
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923 |
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924 @Override |
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925 public Object findExportedSymbol(TruffleLanguage.Env env, String globalName, boolean onlyExplicit) { |
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926 return super.findExportedSymbol(env, globalName, onlyExplicit); |
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927 } |
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928 |
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929 @Override |
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930 protected Object languageGlobal(TruffleLanguage.Env env) { |
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931 return super.languageGlobal(env); |
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932 } |
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933 |
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934 @Override |
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935 public ToolSupportProvider getToolSupport(TruffleLanguage<?> l) { |
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936 return super.getToolSupport(l); |
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937 } |
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938 |
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939 @Override |
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940 public DebugSupportProvider getDebugSupport(TruffleLanguage<?> l) { |
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941 return super.getDebugSupport(l); |
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942 } |
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943 |
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944 @Override |
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945 protected Class<? extends TruffleLanguage> findLanguage(Probe probe) { |
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946 return super.findLanguage(probe); |
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947 } |
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948 |
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949 @Override |
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950 protected Env findLanguage(Object obj, Class<? extends TruffleLanguage> languageClass) { |
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951 TruffleVM vm = (TruffleVM) obj; |
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952 return vm.findEnv(languageClass); |
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953 } |
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954 |
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955 @Override |
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956 protected Closeable executionStart(Object obj, Debugger[] fillIn, Source s) { |
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957 TruffleVM vm = (TruffleVM) obj; |
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958 return super.executionStart(vm, fillIn, s); |
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959 } |
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960 |
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961 @Override |
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962 protected void dispatchEvent(Object obj, Object event) { |
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963 TruffleVM vm = (TruffleVM) obj; |
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964 vm.dispatch(event); |
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965 } |
22183
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966 |
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967 @Override |
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968 protected void dispose(TruffleLanguage<?> impl, TruffleLanguage.Env env) { |
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969 super.dispose(impl, env); |
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970 } |
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971 } // end of SPIAccessor |
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972 } |