Mercurial > hg > graal-jvmci-8

annotate jvmci/jdk.vm.ci.services/src/jdk/vm/ci/services/JVMCIClassLoaderFactory.java @ 24140:d4858e92c9b1

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[GR-4077] support Graal.SDK on the boot class path and Truffle on a class path invisible to apps but visible to JVMCI
author Doug Simon <doug.simon@oracle.com>
date Tue, 13 Jun 2017 14:22:54 +0200
parents 450e0bafd83d
children d442ede93e4b
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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.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package jdk.vm.ci.services;
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24
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25 import java.io.File;
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26 import java.io.IOException;
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27 import java.net.MalformedURLException;
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28 import java.net.URL;
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29 import java.net.URLClassLoader;
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30 import java.nio.file.Files;
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31 import java.nio.file.Path;
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32 import java.nio.file.Paths;
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33 import java.util.ArrayList;
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34 import java.util.List;
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35
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36 import sun.misc.VM;
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37
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38 /**
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39 * Utility called from the VM to create and register a separate class loader for loading JVMCI
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40 * classes (i.e., those in found in {@code <java.home>/lib/jvmci/*.jar)} as well as those available
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41 * on the class path in the {@code "jvmci.class.path.append"} system property. The JVMCI class
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42 * loader can optionally be given a parent other than the boot class loader as specified by
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43 * {@link #getJVMCIParentClassLoader(Path)}.
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44 */
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45 class JVMCIClassLoaderFactory {
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46
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47 /**
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48 * Copy of the {@code UseJVMCIClassLoader} VM option. Set by the VM before the static
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49 * initializer is called.
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50 */
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51 private static boolean useJVMCIClassLoader;
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52
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53 /**
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54 * Registers the JVMCI class loader in the VM.
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55 */
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56 private static native void init(ClassLoader loader);
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57
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58 static {
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59 init(useJVMCIClassLoader ? newClassLoader() : null);
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60 }
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61
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62 /**
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63 * Creates a new class loader for loading JVMCI classes.
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64 */
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65 private static ClassLoader newClassLoader() {
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66 Path jvmciDir = Paths.get(VM.getSavedProperty("java.home"), "lib", "jvmci");
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67 if (!Files.isDirectory(jvmciDir)) {
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68 throw new InternalError(jvmciDir + " does not exist or is not a directory");
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69 }
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70 URL[] urls = getJVMCIJarsUrls(jvmciDir);
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71 ClassLoader parent = getJVMCIParentClassLoader(jvmciDir);
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72 return URLClassLoader.newInstance(urls, parent);
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73 }
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74
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75 /**
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76 * Creates a parent class loader for the JVMCI class loader. The class path for the loader is
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77 * specified in the optional file {@code <java.home>/lib/jvmci/parentClassLoader.classpath}. If
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78 * the file exists, its contents must be a well formed class path. Relative entries in the class
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79 * path are resolved against {@code <java.home>/lib/jvmci}.
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80 *
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81 * @return {@code null} if {@code <java.home>/lib/jvmci/parentClassLoader.classpath} does not
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82 * exist otherwise a {@link URLClassLoader} constructed from the class path in the file
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83 */
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84 private static ClassLoader getJVMCIParentClassLoader(Path jvmciDir) {
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85 Path parentFile = jvmciDir.resolve("parentClassLoader.classpath");
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86 if (Files.exists(parentFile)) {
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87 String[] entries;
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88 try {
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89 entries = new String(Files.readAllBytes(parentFile)).trim().split(File.pathSeparator);
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90 } catch (IOException e) {
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91 throw new InternalError("Error reading " + parentFile.toAbsolutePath(), e);
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92 }
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93 URL[] urls = new URL[entries.length];
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94 for (int i = 0; i < entries.length; i++) {
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95 try {
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96 // If entries[i] is already absolute, it will remain unchanged
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97 urls[i] = jvmciDir.resolve(entries[i]).toFile().toURI().toURL();
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98 } catch (MalformedURLException e) {
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99 throw new InternalError(e);
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100 }
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101 }
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102 ClassLoader parent = null;
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103 return URLClassLoader.newInstance(urls, parent);
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104 }
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105 return null;
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106 }
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107
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108 /**
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109 * Gets the URLs for all jar files in the {@code jvmciDir} directory as well as the entries
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110 * specified by the {@code "jvmci.class.path.append"} system property.
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111 */
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112 private static URL[] getJVMCIJarsUrls(Path jvmciDir) {
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113 String[] dirEntries = jvmciDir.toFile().list();
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114
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115 String append = VM.getSavedProperty("jvmci.class.path.append");
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116 String[] appendEntries = append != null ? append.split(File.pathSeparator) : new String[0];
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117 List<URL> urls = new ArrayList<>(dirEntries.length + appendEntries.length);
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118
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119 for (String fileName : dirEntries) {
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120 if (fileName.endsWith(".jar")) {
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121 Path path = jvmciDir.resolve(fileName);
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122 if (Files.isDirectory(path)) {
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123 continue;
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124 }
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125 try {
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126 urls.add(path.toFile().toURI().toURL());
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127 } catch (MalformedURLException e) {
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128 throw new InternalError(e);
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129 }
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130 }
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131 }
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132 for (String path : appendEntries) {
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133 try {
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134 urls.add(new File(path).toURI().toURL());
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135 } catch (MalformedURLException e) {
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136 throw new InternalError(e);
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137 }
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138 }
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139
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140 return urls.toArray(new URL[urls.size()]);
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141 }
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142 }