Mercurial > hg > truffle
annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/vm/TruffleVM.java @ 21557:31fc2fce38f3
Merge.
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 27 May 2015 13:32:18 +0200 |
parents | b1530a6cce8c 3286fb5fea4a |
children | 1c76a5662753 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.oracle.truffle.api.vm; |
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26 |
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27 import java.io.*; |
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28 import java.lang.reflect.*; |
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29 import java.net.*; |
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30 import java.nio.file.*; |
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31 import java.util.*; |
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32 import java.util.logging.*; |
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33 |
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34 import com.oracle.truffle.api.*; |
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35 import com.oracle.truffle.api.TruffleLanguage.Env; |
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36 import com.oracle.truffle.api.TruffleLanguage.Registration; |
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37 import com.oracle.truffle.api.impl.*; |
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38 import com.oracle.truffle.api.source.*; |
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39 |
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40 /** |
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41 * Virtual machine for Truffle based languages. Use {@link #newVM()} to create new isolated virtual |
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42 * machine ready for execution of various languages. All the languages in a single virtual machine |
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43 * see each other exported global symbols and can co-operate. Use {@link #newVM()} multiple times to |
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44 * create different, isolated virtual machines completely separated from each other. |
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45 * <p> |
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46 * Once instantiated use {@link #eval(java.net.URI)} with a reference to a file or URL or directly |
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47 * pass code snippet into the virtual machine via {@link #eval(java.lang.String, java.lang.String)}. |
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48 * Support for individual languages is initialized on demand - e.g. once a file of certain mime type |
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49 * is about to be processed, its appropriate engine (if found), is initialized. Once an engine gets |
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50 * initialized, it remains so, until the virtual machine isn't garbage collected. |
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51 * <p> |
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52 * The <code>TruffleVM</code> is single-threaded and tries to enforce that. It records the thread it |
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53 * has been {@link Builder#build() created} by and checks that all subsequent calls are coming from |
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54 * the same thread. |
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55 */ |
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56 public final class TruffleVM { |
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57 private static final Logger LOG = Logger.getLogger(TruffleVM.class.getName()); |
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58 private static final SPIAccessor SPI = new SPIAccessor(); |
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59 private final Thread initThread; |
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60 private final Map<String, Language> langs; |
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61 private final Reader in; |
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62 private final Writer err; |
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63 private final Writer out; |
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64 |
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65 /** |
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66 * Private & temporary only constructor. |
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67 */ |
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68 private TruffleVM() { |
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69 this.initThread = null; |
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70 this.in = null; |
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71 this.err = null; |
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72 this.out = null; |
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73 this.langs = null; |
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74 } |
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75 |
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76 /** |
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77 * Real constructor used from the builder. |
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78 * |
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79 * @param out stdout |
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80 * @param err stderr |
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81 * @param in stdin |
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82 */ |
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83 private TruffleVM(Writer out, Writer err, Reader in) { |
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84 this.out = out; |
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85 this.err = err; |
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86 this.in = in; |
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87 this.initThread = Thread.currentThread(); |
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88 this.langs = new HashMap<>(); |
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89 Enumeration<URL> en; |
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90 try { |
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91 en = loader().getResources("META-INF/truffle/language"); |
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92 } catch (IOException ex) { |
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93 throw new IllegalStateException("Cannot read list of Truffle languages", ex); |
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94 } |
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95 while (en.hasMoreElements()) { |
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96 URL u = en.nextElement(); |
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97 Properties p; |
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98 try { |
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99 p = new Properties(); |
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100 try (InputStream is = u.openStream()) { |
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101 p.load(is); |
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102 } |
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103 } catch (IOException ex) { |
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104 LOG.log(Level.CONFIG, "Cannot process " + u + " as language definition", ex); |
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105 continue; |
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106 } |
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107 Language l = new Language(p); |
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108 for (String mimeType : l.getMimeTypes()) { |
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109 langs.put(mimeType, l); |
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110 } |
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111 } |
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112 } |
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113 |
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114 static ClassLoader loader() { |
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115 ClassLoader l = TruffleVM.class.getClassLoader(); |
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116 if (l == null) { |
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117 l = ClassLoader.getSystemClassLoader(); |
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118 } |
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119 return l; |
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120 } |
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121 |
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122 /** |
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123 * Creation of new Truffle virtual machine. Use the {@link Builder} methods to configure your |
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124 * virtual machine and then create one using {@link Builder#build()}: |
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125 * |
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126 * <pre> |
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127 * {@link TruffleVM} vm = {@link TruffleVM}.{@link TruffleVM#newVM() newVM()} |
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128 * .{@link Builder#stdOut(java.io.Writer) stdOut}({@link Writer yourWriter}) |
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129 * .{@link Builder#stdErr(java.io.Writer) stdErr}({@link Writer yourWriter}) |
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130 * .{@link Builder#stdIn(java.io.Reader) stdIn}({@link Reader yourReader}) |
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131 * .{@link Builder#build() build()}; |
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132 * </pre> |
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133 * |
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134 * It searches for {@link Registration languages registered} in the system class loader and |
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135 * makes them available for later evaluation via |
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136 * {@link #eval(java.lang.String, java.lang.String)} methods. |
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137 * |
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138 * @return new, isolated virtual machine with pre-registered languages |
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139 */ |
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140 public static TruffleVM.Builder newVM() { |
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141 // making Builder non-static inner class is a |
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142 // nasty trick to avoid the Builder class to appear |
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143 // in Javadoc next to TruffleVM class |
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144 TruffleVM vm = new TruffleVM(); |
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145 return vm.new Builder(); |
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146 } |
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147 |
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148 /** |
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149 * Builder for a new {@link TruffleVM}. Call various configuration methods in a chain and at the |
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150 * end create new {@link TruffleVM virtual machine}: |
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151 * |
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152 * <pre> |
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153 * {@link TruffleVM} vm = {@link TruffleVM}.{@link TruffleVM#newVM() newVM()} |
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154 * .{@link Builder#stdOut(java.io.Writer) stdOut}({@link Writer yourWriter}) |
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155 * .{@link Builder#stdErr(java.io.Writer) stdErr}({@link Writer yourWriter}) |
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156 * .{@link Builder#stdIn(java.io.Reader) stdIn}({@link Reader yourReader}) |
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157 * .{@link Builder#build() build()}; |
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158 * </pre> |
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159 */ |
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160 public final class Builder { |
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161 private Writer out; |
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162 private Writer err; |
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163 private Reader in; |
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164 |
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165 Builder() { |
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166 } |
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167 |
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168 /** |
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169 * Changes the defaut output for languages running in <em>to be created</em> |
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170 * {@link TruffleVM virtual machine}. The default is to use {@link System#out}. |
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171 * |
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172 * @param w the writer to use as output |
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173 * @return instance of this builder |
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174 */ |
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175 public Builder stdOut(Writer w) { |
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176 out = w; |
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177 return this; |
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178 } |
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179 |
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180 /** |
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181 * Changes the error output for languages running in <em>to be created</em> |
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182 * {@link TruffleVM virtual machine}. The default is to use {@link System#err}. |
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183 * |
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184 * @param w the writer to use as output |
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185 * @return instance of this builder |
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186 */ |
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187 public Builder stdErr(Writer w) { |
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188 err = w; |
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189 return this; |
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190 } |
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191 |
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192 /** |
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193 * Changes the defaut input for languages running in <em>to be created</em> |
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194 * {@link TruffleVM virtual machine}. The default is to use {@link System#out}. |
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195 * |
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196 * @param r the reader to use as input |
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197 * @return instance of this builder |
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198 */ |
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199 public Builder stdIn(Reader r) { |
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200 in = r; |
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201 return this; |
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202 } |
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203 |
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204 /** |
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205 * Creates the {@link TruffleVM Truffle virtual machine}. The configuration is taken from |
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206 * values passed into configuration methods in this class. |
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207 * |
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208 * @return new, isolated virtual machine with pre-registered languages |
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209 */ |
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210 public TruffleVM build() { |
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211 if (out == null) { |
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212 out = new OutputStreamWriter(System.out); |
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213 } |
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214 if (err == null) { |
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215 err = new OutputStreamWriter(System.err); |
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216 } |
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217 if (in == null) { |
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218 in = new InputStreamReader(System.in); |
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219 } |
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220 return new TruffleVM(out, err, in); |
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221 } |
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222 } |
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223 |
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224 /** |
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225 * Descriptions of languages supported in this Truffle virtual machine. |
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226 * |
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227 * @return an immutable map with keys being mimetypes and values the {@link Language |
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228 * descriptions} of associated languages |
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229 */ |
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230 public Map<String, Language> getLanguages() { |
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231 return Collections.unmodifiableMap(langs); |
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232 } |
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233 |
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234 /** |
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235 * Evaluates file located on a given URL. Is equivalent to loading the content of a file and |
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236 * executing it via {@link #eval(java.lang.String, java.lang.String)} with a mime type guess |
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237 * based on the file's extension and/or content. |
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238 * |
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239 * @param location the location of a file to execute |
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240 * @return result of a processing the file, possibly <code>null</code> |
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241 * @throws IOException exception to signal I/O problems or problems with processing the file's |
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242 * content |
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243 */ |
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244 public Object eval(URI location) throws IOException { |
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245 checkThread(); |
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246 Source s; |
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247 String mimeType; |
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248 if (location.getScheme().equals("file")) { |
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249 File file = new File(location); |
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250 s = Source.fromFileName(file.getPath(), true); |
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251 if (file.getName().endsWith(".c")) { |
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252 mimeType = "text/x-c"; |
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253 } else if (file.getName().endsWith(".sl")) { |
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254 mimeType = "application/x-sl"; |
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255 } else { |
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256 mimeType = Files.probeContentType(file.toPath()); |
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257 } |
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258 } else { |
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259 URL url = location.toURL(); |
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260 s = Source.fromURL(url, location.toString()); |
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261 URLConnection conn = url.openConnection(); |
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262 mimeType = conn.getContentType(); |
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263 } |
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264 TruffleLanguage l = getTruffleLang(mimeType); |
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265 if (l == null) { |
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266 throw new IOException("No language for " + location + " with mime type " + mimeType + " found. Supported types: " + langs.keySet()); |
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267 } |
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268 return SPI.eval(l, s); |
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269 } |
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270 |
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271 /** |
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272 * Evaluates code snippet. Chooses a language registered for a given mime type (throws |
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273 * {@link IOException} if there is none). And passes the specified code to it for execution. |
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274 * |
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275 * @param mimeType mime type of the code snippet - chooses the right language |
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276 * @param reader the source of code snippet to execute |
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277 * @return result of an exceution, possibly <code>null</code> |
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278 * @throws IOException thrown to signal errors while processing the code |
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279 */ |
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280 public Object eval(String mimeType, Reader reader) throws IOException { |
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281 checkThread(); |
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282 TruffleLanguage l = getTruffleLang(mimeType); |
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283 if (l == null) { |
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284 throw new IOException("No language for mime type " + mimeType + " found. Supported types: " + langs.keySet()); |
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285 } |
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286 return SPI.eval(l, Source.fromReader(reader, mimeType)); |
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287 } |
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288 |
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289 /** |
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290 * Evaluates code snippet. Chooses a language registered for a given mime type (throws |
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291 * {@link IOException} if there is none). And passes the specified code to it for execution. |
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292 * |
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293 * @param mimeType mime type of the code snippet - chooses the right language |
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294 * @param code the code snippet to execute |
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295 * @return result of an exceution, possibly <code>null</code> |
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296 * @throws IOException thrown to signal errors while processing the code |
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297 */ |
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298 public Object eval(String mimeType, String code) throws IOException { |
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299 checkThread(); |
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300 TruffleLanguage l = getTruffleLang(mimeType); |
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301 if (l == null) { |
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302 throw new IOException("No language for mime type " + mimeType + " found. Supported types: " + langs.keySet()); |
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303 } |
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304 return SPI.eval(l, Source.fromText(code, mimeType)); |
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305 } |
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306 |
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307 /** |
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308 * Looks global symbol provided by one of initialized languages up. First of all execute your |
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309 * program via one of your {@link #eval(java.lang.String, java.lang.String)} and then look |
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310 * expected symbol up using this method. |
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311 * <p> |
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312 * The names of the symbols are language dependant, but for example the Java language bindings |
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313 * follow the specification for method references: |
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314 * <ul> |
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315 * <li>"java.lang.Exception::new" is a reference to constructor of {@link Exception} |
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316 * <li>"java.lang.Integer::valueOf" is a reference to static method in {@link Integer} class |
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317 * </ul> |
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318 * Once an symbol is obtained, it remembers values for fast acces and is ready for being |
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319 * invoked. |
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320 * |
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321 * @param globalName the name of the symbol to find |
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322 * @return found symbol or <code>null</code> if it has not been found |
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323 */ |
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324 public Symbol findGlobalSymbol(String globalName) { |
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325 checkThread(); |
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326 Object obj = null; |
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327 Object global = null; |
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328 for (Language dl : langs.values()) { |
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329 TruffleLanguage l = dl.getImpl(); |
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330 obj = SPI.findExportedSymbol(l, globalName); |
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331 if (obj != null) { |
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332 global = SPI.languageGlobal(l); |
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333 break; |
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334 } |
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335 } |
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336 return obj == null ? null : new Symbol(obj, global); |
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337 } |
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338 |
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339 private void checkThread() { |
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340 if (initThread != Thread.currentThread()) { |
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341 throw new IllegalStateException("TruffleVM created on " + initThread.getName() + " but used on " + Thread.currentThread().getName()); |
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342 } |
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343 } |
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344 |
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345 private TruffleLanguage getTruffleLang(String mimeType) { |
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346 checkThread(); |
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347 Language l = langs.get(mimeType); |
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348 return l == null ? null : l.getImpl(); |
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349 } |
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350 |
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351 /** |
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352 * Represents {@link TruffleVM#findGlobalSymbol(java.lang.String) global symbol} provided by one |
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353 * of the initialized languages in {@link TruffleVM Truffle virtual machine}. |
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354 */ |
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355 public class Symbol { |
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356 private final Object obj; |
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357 private final Object global; |
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358 |
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359 Symbol(Object obj, Object global) { |
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360 this.obj = obj; |
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361 this.global = global; |
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362 } |
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363 |
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364 /** |
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365 * Invokes the symbol. If the symbol represents a function, then it should be invoked with |
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366 * provided arguments. If the symbol represents a field, then first argument (if provided) |
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367 * should set the value to the field; the return value should be the actual value of the |
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368 * field when the <code>invoke</code> method returns. |
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369 * |
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370 * @param thiz this/self in language that support such concept; use <code>null</code> to let |
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371 * the language use default this/self or ignore the value |
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372 * @param args arguments to pass when invoking the symbol |
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373 * @return the value returned by invoking the symbol |
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374 * @throws IOException signals problem during execution |
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375 */ |
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376 public Object invoke(Object thiz, Object... args) throws IOException { |
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377 List<Object> arr = new ArrayList<>(); |
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378 if (thiz == null) { |
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379 if (global != null) { |
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380 arr.add(global); |
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381 } |
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382 } else { |
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383 arr.add(thiz); |
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384 } |
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385 arr.addAll(Arrays.asList(args)); |
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386 return SPI.invoke(obj, arr.toArray()); |
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387 } |
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388 } |
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389 |
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390 /** |
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391 * Description of a language registered in {@link TruffleVM Truffle virtual machine}. Languages |
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392 * are registered by {@link Registration} annotation which stores necessary information into a |
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393 * descriptor inside of the language's JAR file. When a new {@link TruffleVM} is created, it |
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394 * reads all available descritors and creates {@link Language} objects to represent them. One |
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395 * can obtain a {@link #getName() name} or list of supported {@link #getMimeTypes() mimetypes} |
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396 * for each language. The actual language implementation is not initialized until |
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397 * {@link TruffleVM#eval(java.lang.String, java.lang.String) a code is evaluated} in it. |
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398 */ |
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399 public final class Language { |
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400 private final Properties props; |
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401 private TruffleLanguage impl; |
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402 |
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403 Language(Properties props) { |
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404 this.props = props; |
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405 } |
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406 |
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407 /** |
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408 * Mimetypes recognized by the language. |
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409 * |
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410 * @return returns immutable set of recognized mimetypes |
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411 */ |
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412 public Set<String> getMimeTypes() { |
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413 TreeSet<String> ts = new TreeSet<>(); |
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414 for (int i = 0;; i++) { |
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415 String mt = props.getProperty("mimeType." + i); |
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416 if (mt == null) { |
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417 break; |
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418 } |
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419 ts.add(mt); |
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420 } |
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421 return Collections.unmodifiableSet(ts); |
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422 } |
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423 |
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424 /** |
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425 * Human readable name of the language. Think of C, Ruby, JS, etc. |
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426 * |
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427 * @return string giving the language a name |
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428 */ |
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429 public String getName() { |
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430 return props.getProperty("name"); |
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431 } |
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432 |
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433 TruffleLanguage getImpl() { |
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434 if (impl == null) { |
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435 String n = props.getProperty("className"); |
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436 try { |
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437 Class<?> langClazz = Class.forName(n, true, loader()); |
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438 Constructor<?> constructor = langClazz.getConstructor(Env.class); |
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439 impl = SPI.attachEnv(TruffleVM.this, constructor, out, err, in); |
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440 } catch (Exception ex) { |
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441 throw new IllegalStateException("Cannot initialize " + getName() + " language with implementation " + n, ex); |
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442 } |
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443 } |
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444 return impl; |
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445 } |
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446 |
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447 @Override |
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448 public String toString() { |
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449 return "[" + getName() + " for " + getMimeTypes() + "]"; |
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450 } |
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451 } // end of Language |
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452 |
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453 private static class SPIAccessor extends Accessor { |
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454 @Override |
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455 public Object importSymbol(TruffleVM vm, TruffleLanguage ownLang, String globalName) { |
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456 Set<Language> uniqueLang = new LinkedHashSet<>(vm.langs.values()); |
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457 for (Language dl : uniqueLang) { |
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458 TruffleLanguage l = dl.getImpl(); |
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459 if (l == ownLang) { |
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460 continue; |
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461 } |
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462 Object obj = SPI.findExportedSymbol(l, globalName); |
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463 if (obj != null) { |
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464 return obj; |
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465 } |
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466 } |
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467 return null; |
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468 } |
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469 |
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470 @Override |
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471 public TruffleLanguage attachEnv(TruffleVM vm, Constructor<?> langClazz, Writer stdOut, Writer stdErr, Reader stdIn) { |
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472 return super.attachEnv(vm, langClazz, stdOut, stdErr, stdIn); |
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473 } |
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474 |
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475 @Override |
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476 public Object eval(TruffleLanguage l, Source s) throws IOException { |
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477 return super.eval(l, s); |
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478 } |
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479 |
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480 @Override |
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481 public Object findExportedSymbol(TruffleLanguage l, String globalName) { |
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482 return super.findExportedSymbol(l, globalName); |
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483 } |
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484 |
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485 @Override |
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486 public Object languageGlobal(TruffleLanguage l) { |
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487 return super.languageGlobal(l); |
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488 } |
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489 |
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490 @Override |
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491 public Object invoke(Object obj, Object[] args) throws IOException { |
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492 return super.invoke(obj, args); |
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493 } |
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494 } // end of SPIAccessor |
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495 } |