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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/vm/TruffleVM.java @ 21468:99942eac9c6d

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Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Fri, 22 May 2015 13:41:10 +0200
parents
children 2dad34a3d7b0
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21468
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
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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
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
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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
99942eac9c6d Introducing TruffleVM - a central place to invoke code in any registered TruffleLanguage.
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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.TruffleLanguage;
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28 import com.oracle.truffle.api.TruffleLanguage.Registration;
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29 import com.oracle.truffle.api.TruffleLanguage.Env;
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30 import com.oracle.truffle.api.impl.Accessor;
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31 import com.oracle.truffle.api.source.Source;
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32 import java.io.File;
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33 import java.io.IOException;
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34 import java.io.InputStream;
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35 import java.io.Reader;
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36 import java.net.URI;
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37 import java.net.URL;
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38 import java.net.URLConnection;
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39 import java.nio.file.Files;
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40 import java.util.ArrayList;
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41 import java.util.Arrays;
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42 import java.util.Collections;
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43 import java.util.Enumeration;
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44 import java.util.HashMap;
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45 import java.util.LinkedHashSet;
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46 import java.util.List;
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47 import java.util.Map;
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48 import java.util.Properties;
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49 import java.util.Set;
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50 import java.util.TreeSet;
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51 import java.util.logging.Level;
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52 import java.util.logging.Logger;
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53
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54 /**
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55 * Virtual machine for Truffle based languages. Use {@link #create()} to instantiate new isolated
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56 * virtual machine ready for execution of various languages. All the languages in a single virtual
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57 * machine see each other exported global symbols and can co-operate. Use {@link #create()} multiple
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58 * times to create different, isolated virtual machines completely separated from each other.
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59 * <p>
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60 * Once instantiated use {@link #eval(java.net.URI)} with a reference to a file or URL or directly
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61 * pass code snippet into the virtual machine via {@link #eval(java.lang.String, java.lang.String)}.
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62 * Support for individual languages is initialized on demand - e.g. once a file of certain mime type
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63 * is about to be processed, its appropriate engine (if found), is initialized. Once an engine gets
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64 * initialized, it remains so, until the virtual machine isn't garbage collected.
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65 * <p>
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66 * The <code>TruffleVM</code> is single-threaded and tries to enforce that. It records the thread it
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67 * has been {@link #create() created} by and checks that all subsequent calls are coming from the
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68 * same thread.
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69 */
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70 public final class TruffleVM {
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71 private static final Logger LOG = Logger.getLogger(TruffleVM.class.getName());
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72 private static final SPIAccessor SPI = new SPIAccessor();
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73 private final Thread initThread;
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74 private final Map<String, Language> langs;
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75
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76 private TruffleVM() {
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77 initThread = Thread.currentThread();
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78 this.langs = new HashMap<>();
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79 Enumeration<URL> en;
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80 try {
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81 en = loader().getResources("META-INF/truffle/language");
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82 } catch (IOException ex) {
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83 throw new IllegalStateException("Cannot read list of Truffle languages", ex);
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84 }
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85 while (en.hasMoreElements()) {
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86 URL u = en.nextElement();
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87 Properties p;
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88 try {
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89 p = new Properties();
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90 try (InputStream is = u.openStream()) {
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91 p.load(is);
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92 }
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93 } catch (IOException ex) {
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94 LOG.log(Level.CONFIG, "Cannot process " + u + " as language definition", ex);
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95 continue;
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96 }
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97 Language l = new Language(p);
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98 for (String mimeType : l.getMimeTypes()) {
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99 langs.put(mimeType, l);
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100 }
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101 }
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102 }
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103
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104 static ClassLoader loader() {
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105 ClassLoader l = TruffleVM.class.getClassLoader();
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106 if (l == null) {
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107 l = ClassLoader.getSystemClassLoader();
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108 }
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109 return l;
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110 }
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111
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112 /**
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113 * Creates new Truffle virtual machine. It searches for {@link Registration languages
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114 * registered} in the system class loader and makes them available for later evaluation via
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115 * {@link #eval(java.lang.String, java.lang.String)} methods.
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116 *
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117 * @return new, isolated virtual machine with pre-registered languages
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118 */
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119 public static TruffleVM create() {
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120 return new TruffleVM();
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121 }
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122
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123 /**
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124 * Descriptions of languages supported in this Truffle virtual machine.
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125 *
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126 * @return an immutable map with keys being mimetypes and values the {@link Language
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127 * descriptions} of associated languages
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128 */
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129 public Map<String, Language> getLanguages() {
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130 return Collections.unmodifiableMap(langs);
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131 }
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132
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133 /**
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134 * Evaluates file located on a given URL. Is equivalent to loading the content of a file and
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135 * executing it via {@link #eval(java.lang.String, java.lang.String)} with a mime type guess
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136 * based on the file's extension and/or content.
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137 *
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138 * @param location the location of a file to execute
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139 * @return result of a processing the file, possibly <code>null</code>
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140 * @throws IOException exception to signal I/O problems or problems with processing the file's
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141 * content
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142 */
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143 public Object eval(URI location) throws IOException {
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144 checkThread();
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145 Source s;
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146 String mimeType;
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147 if (location.getScheme().equals("file")) {
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148 File file = new File(location);
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149 s = Source.fromFileName(file.getPath(), true);
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150 mimeType = file.getName().endsWith(".c") ? "text/x-c" : Files.probeContentType(file.toPath());
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151 } else {
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152 URL url = location.toURL();
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153 s = Source.fromURL(url, location.toString());
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154 URLConnection conn = url.openConnection();
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155 mimeType = conn.getContentType();
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156 }
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157 TruffleLanguage l = getTruffleLang(mimeType);
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158 if (l == null) {
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159 throw new IOException("No language for " + location + " with mime type " + mimeType + " found. Supported types: " + langs.keySet());
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160 }
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161 return SPI.eval(l, s);
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162 }
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163
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164 /**
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165 * Evaluates code snippet. Chooses a language registered for a given mime type (throws
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166 * {@link IOException} if there is none). And passes the specified code to it for execution.
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167 *
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168 * @param mimeType mime type of the code snippet - chooses the right language
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169 * @param reader the source of code snippet to execute
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170 * @return result of an exceution, possibly <code>null</code>
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171 * @throws IOException thrown to signal errors while processing the code
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172 */
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173 public Object eval(String mimeType, Reader reader) throws IOException {
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174 checkThread();
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175 TruffleLanguage l = getTruffleLang(mimeType);
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176 if (l == null) {
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177 throw new IOException("No language for mime type " + mimeType + " found. Supported types: " + langs.keySet());
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178 }
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179 return SPI.eval(l, Source.fromReader(reader, mimeType));
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180 }
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181
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182 /**
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183 * Evaluates code snippet. Chooses a language registered for a given mime type (throws
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184 * {@link IOException} if there is none). And passes the specified code to it for execution.
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185 *
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186 * @param mimeType mime type of the code snippet - chooses the right language
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187 * @param code the code snippet to execute
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188 * @return result of an exceution, possibly <code>null</code>
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189 * @throws IOException thrown to signal errors while processing the code
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190 */
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191 public Object eval(String mimeType, String code) throws IOException {
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192 checkThread();
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193 TruffleLanguage l = getTruffleLang(mimeType);
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194 if (l == null) {
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195 throw new IOException("No language for mime type " + mimeType + " found. Supported types: " + langs.keySet());
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196 }
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197 return SPI.eval(l, Source.fromText(code, mimeType));
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198 }
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199
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200 /**
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201 * Looks global symbol provided by one of initialized languages up. First of all execute your
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202 * program via one of your {@link #eval(java.lang.String, java.lang.String)} and then look
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203 * expected symbol up using this method.
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204 * <p>
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205 * The names of the symbols are language dependant, but for example the Java language bindings
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206 * follow the specification for method references:
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207 * <ul>
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208 * <li>"java.lang.Exception::new" is a reference to constructor of {@link Exception}
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209 * <li>"java.lang.Integer::valueOf" is a reference to static method in {@link Integer} class
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210 * </ul>
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211 * Once an symbol is obtained, it remembers values for fast acces and is ready for being
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212 * invoked.
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213 *
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214 * @param globalName the name of the symbol to find
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215 * @return found symbol or <code>null</code> if it has not been found
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216 */
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217 public Symbol findGlobalSymbol(String globalName) {
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218 checkThread();
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219 Object obj = null;
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220 Object global = null;
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221 for (Language dl : langs.values()) {
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222 TruffleLanguage l = dl.getImpl();
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223 obj = SPI.findExportedSymbol(l, globalName);
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224 if (obj != null) {
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225 global = SPI.languageGlobal(l);
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226 break;
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227 }
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228 }
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229 return obj == null ? null : new Symbol(obj, global);
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230 }
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231
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232 private void checkThread() {
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233 if (initThread != Thread.currentThread()) {
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234 throw new IllegalStateException("TruffleVM created on " + initThread.getName() + " but used on " + Thread.currentThread().getName());
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235 }
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236 }
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237
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238 private TruffleLanguage getTruffleLang(String mimeType) {
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239 checkThread();
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240 Language l = langs.get(mimeType);
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241 return l == null ? null : l.getImpl();
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242 }
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243
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244 /**
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245 * Represents {@link TruffleVM#findGlobalSymbol(java.lang.String) global symbol} provided by one
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246 * of the initialized languages in {@link TruffleVM Truffle virtual machine}.
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247 */
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248 public class Symbol {
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249 private final Object obj;
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250 private final Object global;
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251
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252 Symbol(Object obj, Object global) {
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253 this.obj = obj;
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254 this.global = global;
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255 }
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256
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257 /**
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258 * Invokes the symbol. If the symbol represents a function, then it should be invoked with
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259 * provided arguments. If the symbol represents a field, then first argument (if provided)
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260 * should set the value to the field; the return value should be the actual value of the
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261 * field when the <code>invoke</code> method returns.
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262 *
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263 * @param thiz this/self in language that support such concept; use <code>null</code> to let
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264 * the language use default this/self or ignore the value
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265 * @param args arguments to pass when invoking the symbol
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266 * @return the value returned by invoking the symbol
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267 * @throws IOException signals problem during execution
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268 */
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269 public Object invoke(Object thiz, Object... args) throws IOException {
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270 List<Object> arr = new ArrayList<>();
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271 if (thiz == null) {
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272 if (global != null) {
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273 arr.add(global);
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274 }
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275 } else {
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276 arr.add(thiz);
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277 }
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278 arr.addAll(Arrays.asList(args));
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279 return SPI.invoke(obj, arr.toArray());
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280 }
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281 }
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282
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283 /**
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284 * Description of a language registered in {@link TruffleVM Truffle virtual machine}. Languages
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285 * are registered by {@link Registration} annotation which stores necessary information into a
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286 * descriptor inside of the language's JAR file. When a new {@link TruffleVM} is created, it
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287 * reads all available descritors and creates {@link Language} objects to represent them. One
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288 * can obtain a {@link #getName() name} or list of supported {@link #getMimeTypes() mimetypes}
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289 * for each language. The actual language implementation is not initialized until
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290 * {@link TruffleVM#eval(java.lang.String, java.lang.String) a code is evaluated} in it.
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291 */
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292 public final class Language {
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293 private final Properties props;
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294 private TruffleLanguage impl;
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295
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296 Language(Properties props) {
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297 this.props = props;
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298 }
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299
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300 /**
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301 * Mimetypes recognized by the language.
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302 *
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303 * @return returns immutable set of recognized mimetypes
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304 */
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305 public Set<String> getMimeTypes() {
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306 TreeSet<String> ts = new TreeSet<>();
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307 for (int i = 0;; i++) {
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308 String mt = props.getProperty("mimeType." + i);
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diff changeset
309 if (mt == null) {
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310 break;
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diff changeset
311 }
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312 ts.add(mt);
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313 }
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diff changeset
314 return Collections.unmodifiableSet(ts);
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315 }
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316
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317 /**
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318 * Human readable name of the language. Think of C, Ruby, JS, etc.
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319 *
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320 * @return string giving the language a name
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321 */
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322 public String getName() {
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323 return props.getProperty("name");
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324 }
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325
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326 TruffleLanguage getImpl() {
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diff changeset
327 if (impl == null) {
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diff changeset
328 String n = props.getProperty("className");
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diff changeset
329 try {
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330 TruffleLanguage lang = (TruffleLanguage) Class.forName(n, true, loader()).newInstance();
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331 SPI.attachEnv(TruffleVM.this, lang);
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diff changeset
332 impl = lang;
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333 } catch (Exception ex) {
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334 throw new IllegalStateException("Cannot initialize " + getName() + " language with implementation " + n, ex);
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335 }
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336 }
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diff changeset
337 return impl;
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338 }
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339
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340 @Override
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341 public String toString() {
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diff changeset
342 return "[" + getName() + " for " + getMimeTypes() + "]";
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diff changeset
343 }
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344 } // end of Language
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345
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346 private static class SPIAccessor extends Accessor {
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347 @Override
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348 public Object importSymbol(TruffleVM vm, TruffleLanguage ownLang, String globalName) {
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349 Set<Language> uniqueLang = new LinkedHashSet<>(vm.langs.values());
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350 for (Language dl : uniqueLang) {
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351 TruffleLanguage l = dl.getImpl();
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352 if (l == ownLang) {
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353 continue;
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354 }
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355 Object obj = SPI.findExportedSymbol(l, globalName);
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356 if (obj != null) {
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357 return obj;
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358 }
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359 }
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360 return null;
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361 }
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362
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363 @Override
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364 public Env attachEnv(TruffleVM vm, TruffleLanguage l) {
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365 return super.attachEnv(vm, l);
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366 }
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367
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368 @Override
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369 public Object eval(TruffleLanguage l, Source s) throws IOException {
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370 return super.eval(l, s);
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371 }
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372
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373 @Override
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374 public Object findExportedSymbol(TruffleLanguage l, String globalName) {
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375 return super.findExportedSymbol(l, globalName);
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376 }
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377
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378 @Override
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379 public Object languageGlobal(TruffleLanguage l) {
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380 return super.languageGlobal(l);
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381 }
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382
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383 @Override
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384 public Object invoke(Object obj, Object[] args) throws IOException {
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385 return super.invoke(obj, args);
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386 }
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387 } // end of SPIAccessor
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388 }