author | mchung |
Wed, 10 Aug 2016 15:51:25 -0700 | |
changeset 40261 | 86a49ba76f52 |
parent 38457 | 3d019217e322 |
child 41114 | f83e9aebbab4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.internal.module; |
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import java.io.File; |
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import java.io.PrintStream; |
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import java.lang.module.Configuration; |
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import java.lang.module.ModuleDescriptor; |
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import java.lang.module.ModuleFinder; |
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import java.lang.module.ModuleReference; |
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import java.lang.module.ResolvedModule; |
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import java.lang.reflect.Layer; |
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import java.lang.reflect.Module; |
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import java.net.URI; |
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import java.nio.file.Path; |
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import java.nio.file.Paths; |
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import java.util.Collections; |
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import java.util.HashMap; |
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import java.util.HashSet; |
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import java.util.Map; |
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import java.util.Optional; |
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import java.util.Set; |
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import java.util.function.Function; |
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import jdk.internal.loader.BootLoader; |
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import jdk.internal.loader.BuiltinClassLoader; |
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import jdk.internal.misc.SharedSecrets; |
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import jdk.internal.perf.PerfCounter; |
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/** |
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* Initializes/boots the module system. |
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* |
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* The {@link #boot() boot} method is called early in the startup to initialize |
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* the module system. In summary, the boot method creates a Configuration by |
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* resolving a set of module names specified via the launcher (or equivalent) |
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* -m and --add-modules options. The modules are located on a module path that |
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* is constructed from the upgrade module path, system modules, and application |
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* module path. The Configuration is instantiated as the boot Layer with each |
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* module in the the configuration defined to one of the built-in class loaders. |
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*/ |
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public final class ModuleBootstrap { |
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private ModuleBootstrap() { } |
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private static final String JAVA_BASE = "java.base"; |
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private static final String JAVA_SE = "java.se"; |
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// the token for "all default modules" |
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private static final String ALL_DEFAULT = "ALL-DEFAULT"; |
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// the token for "all unnamed modules" |
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private static final String ALL_UNNAMED = "ALL-UNNAMED"; |
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// the token for "all system modules" |
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private static final String ALL_SYSTEM = "ALL-SYSTEM"; |
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// the token for "all modules on the module path" |
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private static final String ALL_MODULE_PATH = "ALL-MODULE-PATH"; |
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// ModuleFinder for the initial configuration |
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private static ModuleFinder initialFinder; |
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/** |
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* Returns the ModuleFinder for the initial configuration |
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*/ |
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public static ModuleFinder finder() { |
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assert initialFinder != null; |
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return initialFinder; |
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} |
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/** |
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* Initialize the module system, returning the boot Layer. |
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* |
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* @see java.lang.System#initPhase2() |
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*/ |
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public static Layer boot() { |
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long t0 = System.nanoTime(); |
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// system modules |
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ModuleFinder systemModules = ModuleFinder.ofSystem(); |
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PerfCounters.systemModulesTime.addElapsedTimeFrom(t0); |
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long t1 = System.nanoTime(); |
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// Once we have the system modules then we define the base module to |
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// the VM. We do this here so that java.base is defined as early as |
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// possible and also that resources in the base module can be located |
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// for error messages that may happen from here on. |
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ModuleReference base = systemModules.find(JAVA_BASE).orElse(null); |
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if (base == null) |
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throw new InternalError(JAVA_BASE + " not found"); |
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URI baseUri = base.location().orElse(null); |
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if (baseUri == null) |
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throw new InternalError(JAVA_BASE + " does not have a location"); |
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BootLoader.loadModule(base); |
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Modules.defineModule(null, base.descriptor(), baseUri); |
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PerfCounters.defineBaseTime.addElapsedTimeFrom(t1); |
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long t2 = System.nanoTime(); |
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// --upgrade-module-path option specified to launcher |
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ModuleFinder upgradeModulePath |
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= createModulePathFinder("jdk.module.upgrade.path"); |
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if (upgradeModulePath != null) |
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systemModules = ModuleFinder.compose(upgradeModulePath, systemModules); |
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// --module-path option specified to the launcher |
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ModuleFinder appModulePath = createModulePathFinder("jdk.module.path"); |
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// The module finder: [--upgrade-module-path] system [--module-path] |
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ModuleFinder finder = systemModules; |
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if (appModulePath != null) |
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finder = ModuleFinder.compose(finder, appModulePath); |
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// The root modules to resolve |
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Set<String> roots = new HashSet<>(); |
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// launcher -m option to specify the main/initial module |
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String mainModule = System.getProperty("jdk.module.main"); |
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if (mainModule != null) |
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roots.add(mainModule); |
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// additional module(s) specified by --add-modules |
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boolean addAllDefaultModules = false; |
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boolean addAllSystemModules = false; |
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boolean addAllApplicationModules = false; |
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String propValue = getAndRemoveProperty("jdk.module.addmods"); |
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if (propValue != null) { |
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for (String mod: propValue.split(",")) { |
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switch (mod) { |
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case ALL_DEFAULT: |
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addAllDefaultModules = true; |
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break; |
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case ALL_SYSTEM: |
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addAllSystemModules = true; |
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break; |
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case ALL_MODULE_PATH: |
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addAllApplicationModules = true; |
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break; |
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default : |
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roots.add(mod); |
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} |
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} |
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} |
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// --limit-modules |
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propValue = getAndRemoveProperty("jdk.module.limitmods"); |
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if (propValue != null) { |
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Set<String> mods = new HashSet<>(); |
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for (String mod: propValue.split(",")) { |
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mods.add(mod); |
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} |
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finder = limitFinder(finder, mods, roots); |
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} |
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// If there is no initial module specified then assume that the initial |
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// module is the unnamed module of the application class loader. This |
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// is implemented by resolving "java.se" and all (non-java.*) modules |
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// that export an API. If "java.se" is not observable then all java.* |
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// modules are resolved. |
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if (mainModule == null || addAllDefaultModules) { |
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boolean hasJava = false; |
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if (systemModules.find(JAVA_SE).isPresent()) { |
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// java.se is a system module |
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if (finder == systemModules || finder.find(JAVA_SE).isPresent()) { |
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// java.se is observable |
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hasJava = true; |
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roots.add(JAVA_SE); |
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} |
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} |
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for (ModuleReference mref : systemModules.findAll()) { |
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String mn = mref.descriptor().name(); |
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if (hasJava && mn.startsWith("java.")) |
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continue; |
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// add as root if observable and exports at least one package |
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if ((finder == systemModules || finder.find(mn).isPresent())) { |
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ModuleDescriptor descriptor = mref.descriptor(); |
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for (ModuleDescriptor.Exports e : descriptor.exports()) { |
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if (!e.isQualified()) { |
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roots.add(mn); |
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break; |
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} |
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} |
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} |
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} |
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} |
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// If `--add-modules ALL-SYSTEM` is specified then all observable system |
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// modules will be resolved. |
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if (addAllSystemModules) { |
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ModuleFinder f = finder; // observable modules |
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systemModules.findAll() |
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.stream() |
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.map(ModuleReference::descriptor) |
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.map(ModuleDescriptor::name) |
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.filter(mn -> f.find(mn).isPresent()) // observable |
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.forEach(mn -> roots.add(mn)); |
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} |
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// If `--add-modules ALL-MODULE-PATH` is specified then all observable |
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// modules on the application module path will be resolved. |
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if (appModulePath != null && addAllApplicationModules) { |
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ModuleFinder f = finder; // observable modules |
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appModulePath.findAll() |
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.stream() |
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.map(ModuleReference::descriptor) |
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.map(ModuleDescriptor::name) |
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.filter(mn -> f.find(mn).isPresent()) // observable |
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.forEach(mn -> roots.add(mn)); |
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} |
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|
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PerfCounters.optionsAndRootsTime.addElapsedTimeFrom(t2); |
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244 |
|
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245 |
|
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long t3 = System.nanoTime(); |
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|
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// determine if post resolution checks are needed |
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boolean needPostResolutionChecks = true; |
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if (baseUri.getScheme().equals("jrt") // toLowerCase not needed here |
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&& (upgradeModulePath == null) |
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&& (appModulePath == null) |
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&& (!ModulePatcher.isBootLayerPatched())) { |
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needPostResolutionChecks = false; |
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} |
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|
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PrintStream traceOutput = null; |
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if (Boolean.getBoolean("jdk.launcher.traceResolver")) |
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traceOutput = System.out; |
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|
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// run the resolver to create the configuration |
|
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Configuration cf = SharedSecrets.getJavaLangModuleAccess() |
36511 | 263 |
.resolveRequiresAndUses(finder, |
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roots, |
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needPostResolutionChecks, |
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traceOutput); |
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|
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// time to create configuration |
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PerfCounters.resolveTime.addElapsedTimeFrom(t3); |
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|
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|
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// mapping of modules to class loaders |
|
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Function<String, ClassLoader> clf = ModuleLoaderMap.mappingFunction(cf); |
|
274 |
||
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// check that all modules to be mapped to the boot loader will be |
|
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// loaded from the runtime image |
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if (needPostResolutionChecks) { |
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for (ResolvedModule resolvedModule : cf.modules()) { |
279 |
ModuleReference mref = resolvedModule.reference(); |
|
280 |
String name = mref.descriptor().name(); |
|
281 |
ClassLoader cl = clf.apply(name); |
|
282 |
if (cl == null) { |
|
283 |
||
284 |
if (upgradeModulePath != null |
|
285 |
&& upgradeModulePath.find(name).isPresent()) |
|
286 |
fail(name + ": cannot be loaded from upgrade module path"); |
|
287 |
||
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if (!systemModules.find(name).isPresent()) |
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fail(name + ": cannot be loaded from application module path"); |
290 |
} |
|
291 |
} |
|
292 |
} |
|
293 |
||
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|
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long t4 = System.nanoTime(); |
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|
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// define modules to VM/runtime |
|
298 |
Layer bootLayer = Layer.empty().defineModules(cf, clf); |
|
299 |
||
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PerfCounters.layerCreateTime.addElapsedTimeFrom(t4); |
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|
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long t5 = System.nanoTime(); |
36511 | 304 |
|
305 |
// define the module to its class loader, except java.base |
|
306 |
for (ResolvedModule resolvedModule : cf.modules()) { |
|
307 |
ModuleReference mref = resolvedModule.reference(); |
|
308 |
String name = mref.descriptor().name(); |
|
309 |
ClassLoader cl = clf.apply(name); |
|
310 |
if (cl == null) { |
|
311 |
if (!name.equals(JAVA_BASE)) BootLoader.loadModule(mref); |
|
312 |
} else { |
|
313 |
((BuiltinClassLoader)cl).loadModule(mref); |
|
314 |
} |
|
315 |
} |
|
316 |
||
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PerfCounters.loadModulesTime.addElapsedTimeFrom(t5); |
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|
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// --add-reads and --add-exports |
36511 | 321 |
addExtraReads(bootLayer); |
322 |
addExtraExports(bootLayer); |
|
323 |
||
324 |
// total time to initialize |
|
325 |
PerfCounters.bootstrapTime.addElapsedTimeFrom(t0); |
|
326 |
||
327 |
// remember the ModuleFinder |
|
328 |
initialFinder = finder; |
|
329 |
||
330 |
return bootLayer; |
|
331 |
} |
|
332 |
||
333 |
/** |
|
334 |
* Returns a ModuleFinder that limits observability to the given root |
|
335 |
* modules, their transitive dependences, plus a set of other modules. |
|
336 |
*/ |
|
337 |
private static ModuleFinder limitFinder(ModuleFinder finder, |
|
338 |
Set<String> roots, |
|
339 |
Set<String> otherMods) |
|
340 |
{ |
|
341 |
// resolve all root modules |
|
342 |
Configuration cf = Configuration.empty() |
|
343 |
.resolveRequires(finder, |
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ModuleFinder.of(), |
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roots); |
346 |
||
347 |
// module name -> reference |
|
348 |
Map<String, ModuleReference> map = new HashMap<>(); |
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349 |
|
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// root modules and their transitive dependences |
36511 | 351 |
cf.modules().stream() |
352 |
.map(ResolvedModule::reference) |
|
353 |
.forEach(mref -> map.put(mref.descriptor().name(), mref)); |
|
354 |
||
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// additional modules |
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356 |
otherMods.stream() |
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.map(finder::find) |
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358 |
.flatMap(Optional::stream) |
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.forEach(mref -> map.putIfAbsent(mref.descriptor().name(), mref)); |
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360 |
|
36511 | 361 |
// set of modules that are observable |
362 |
Set<ModuleReference> mrefs = new HashSet<>(map.values()); |
|
363 |
||
364 |
return new ModuleFinder() { |
|
365 |
@Override |
|
366 |
public Optional<ModuleReference> find(String name) { |
|
367 |
return Optional.ofNullable(map.get(name)); |
|
368 |
} |
|
369 |
@Override |
|
370 |
public Set<ModuleReference> findAll() { |
|
371 |
return mrefs; |
|
372 |
} |
|
373 |
}; |
|
374 |
} |
|
375 |
||
376 |
/** |
|
377 |
* Creates a finder from the module path that is the value of the given |
|
378 |
* system property. |
|
379 |
*/ |
|
380 |
private static ModuleFinder createModulePathFinder(String prop) { |
|
381 |
String s = System.getProperty(prop); |
|
382 |
if (s == null) { |
|
383 |
return null; |
|
384 |
} else { |
|
385 |
String[] dirs = s.split(File.pathSeparator); |
|
386 |
Path[] paths = new Path[dirs.length]; |
|
387 |
int i = 0; |
|
388 |
for (String dir: dirs) { |
|
389 |
paths[i++] = Paths.get(dir); |
|
390 |
} |
|
391 |
return ModuleFinder.of(paths); |
|
392 |
} |
|
393 |
} |
|
394 |
||
395 |
||
396 |
/** |
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397 |
* Process the --add-reads options to add any additional read edges that |
36511 | 398 |
* are specified on the command-line. |
399 |
*/ |
|
400 |
private static void addExtraReads(Layer bootLayer) { |
|
401 |
||
402 |
// decode the command line options |
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403 |
Map<String, Set<String>> map = decode("jdk.module.addreads."); |
36511 | 404 |
|
405 |
for (Map.Entry<String, Set<String>> e : map.entrySet()) { |
|
406 |
||
407 |
// the key is $MODULE |
|
408 |
String mn = e.getKey(); |
|
409 |
Optional<Module> om = bootLayer.findModule(mn); |
|
410 |
if (!om.isPresent()) |
|
411 |
fail("Unknown module: " + mn); |
|
412 |
Module m = om.get(); |
|
413 |
||
414 |
// the value is the set of other modules (by name) |
|
415 |
for (String name : e.getValue()) { |
|
416 |
||
417 |
Module other; |
|
418 |
if (ALL_UNNAMED.equals(name)) { |
|
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419 |
Modules.addReadsAllUnnamed(m); |
36511 | 420 |
} else { |
421 |
om = bootLayer.findModule(name); |
|
422 |
if (!om.isPresent()) |
|
423 |
fail("Unknown module: " + name); |
|
424 |
other = om.get(); |
|
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|
425 |
Modules.addReads(m, other); |
36511 | 426 |
} |
427 |
||
428 |
} |
|
429 |
} |
|
430 |
} |
|
431 |
||
432 |
||
433 |
/** |
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|
434 |
* Process the --add-exports options to add any additional read edges that |
36511 | 435 |
* are specified on the command-line. |
436 |
*/ |
|
437 |
private static void addExtraExports(Layer bootLayer) { |
|
438 |
||
439 |
// decode the command line options |
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440 |
Map<String, Set<String>> map = decode("jdk.module.addexports."); |
36511 | 441 |
|
442 |
for (Map.Entry<String, Set<String>> e : map.entrySet()) { |
|
443 |
||
444 |
// the key is $MODULE/$PACKAGE |
|
445 |
String key = e.getKey(); |
|
446 |
String[] s = key.split("/"); |
|
447 |
if (s.length != 2) |
|
448 |
fail("Unable to parse: " + key); |
|
449 |
||
450 |
String mn = s[0]; |
|
451 |
String pn = s[1]; |
|
452 |
||
453 |
// The exporting module is in the boot layer |
|
454 |
Module m; |
|
455 |
Optional<Module> om = bootLayer.findModule(mn); |
|
456 |
if (!om.isPresent()) |
|
457 |
fail("Unknown module: " + mn); |
|
458 |
m = om.get(); |
|
459 |
||
460 |
// the value is the set of modules to export to (by name) |
|
461 |
for (String name : e.getValue()) { |
|
462 |
boolean allUnnamed = false; |
|
463 |
Module other = null; |
|
464 |
if (ALL_UNNAMED.equals(name)) { |
|
465 |
allUnnamed = true; |
|
466 |
} else { |
|
467 |
om = bootLayer.findModule(name); |
|
468 |
if (om.isPresent()) { |
|
469 |
other = om.get(); |
|
470 |
} else { |
|
471 |
fail("Unknown module: " + name); |
|
472 |
} |
|
473 |
} |
|
474 |
||
475 |
if (allUnnamed) { |
|
476 |
Modules.addExportsToAllUnnamed(m, pn); |
|
477 |
} else { |
|
478 |
Modules.addExports(m, pn, other); |
|
479 |
} |
|
480 |
} |
|
481 |
} |
|
482 |
} |
|
483 |
||
484 |
||
485 |
/** |
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|
486 |
* Decodes the values of --add-reads or --add-exports options |
36511 | 487 |
* |
488 |
* The format of the options is: $KEY=$MODULE(,$MODULE)* |
|
489 |
*/ |
|
490 |
private static Map<String, Set<String>> decode(String prefix) { |
|
491 |
int index = 0; |
|
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492 |
// the system property is removed after decoding |
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|
493 |
String value = getAndRemoveProperty(prefix + index); |
36511 | 494 |
if (value == null) |
495 |
return Collections.emptyMap(); |
|
496 |
||
497 |
Map<String, Set<String>> map = new HashMap<>(); |
|
498 |
||
499 |
while (value != null) { |
|
500 |
||
501 |
int pos = value.indexOf('='); |
|
502 |
if (pos == -1) |
|
503 |
fail("Unable to parse: " + value); |
|
504 |
if (pos == 0) |
|
505 |
fail("Missing module name in: " + value); |
|
506 |
||
507 |
// key is <module> or <module>/<package> |
|
508 |
String key = value.substring(0, pos); |
|
509 |
||
510 |
String rhs = value.substring(pos+1); |
|
511 |
if (rhs.isEmpty()) |
|
512 |
fail("Unable to parse: " + value); |
|
513 |
||
514 |
||
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|
515 |
// value is <module>(,<module>)* |
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|
516 |
if (map.containsKey(key)) |
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|
517 |
fail(key + " specified more than once"); |
36511 | 518 |
|
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|
519 |
Set<String> values = new HashSet<>(); |
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|
520 |
map.put(key, values); |
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|
521 |
for (String s : rhs.split(",")) { |
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522 |
if (s.length() > 0) values.add(s); |
36511 | 523 |
} |
524 |
||
525 |
index++; |
|
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|
526 |
value = getAndRemoveProperty(prefix + index); |
36511 | 527 |
} |
528 |
||
529 |
return map; |
|
530 |
} |
|
531 |
||
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|
532 |
/** |
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|
533 |
* Gets and remove the named system property |
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|
534 |
*/ |
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|
535 |
private static String getAndRemoveProperty(String key) { |
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|
536 |
return (String)System.getProperties().remove(key); |
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|
537 |
} |
36511 | 538 |
|
539 |
/** |
|
540 |
* Throws a RuntimeException with the given message |
|
541 |
*/ |
|
542 |
static void fail(String m) { |
|
543 |
throw new RuntimeException(m); |
|
544 |
} |
|
545 |
||
546 |
static class PerfCounters { |
|
37779
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|
547 |
|
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|
548 |
static PerfCounter systemModulesTime |
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|
549 |
= PerfCounter.newPerfCounter("jdk.module.bootstrap.systemModulesTime"); |
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|
550 |
static PerfCounter defineBaseTime |
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|
551 |
= PerfCounter.newPerfCounter("jdk.module.bootstrap.defineBaseTime"); |
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|
552 |
static PerfCounter optionsAndRootsTime |
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|
553 |
= PerfCounter.newPerfCounter("jdk.module.bootstrap.optionsAndRootsTime"); |
36511 | 554 |
static PerfCounter resolveTime |
555 |
= PerfCounter.newPerfCounter("jdk.module.bootstrap.resolveTime"); |
|
556 |
static PerfCounter layerCreateTime |
|
557 |
= PerfCounter.newPerfCounter("jdk.module.bootstrap.layerCreateTime"); |
|
558 |
static PerfCounter loadModulesTime |
|
559 |
= PerfCounter.newPerfCounter("jdk.module.bootstrap.loadModulesTime"); |
|
560 |
static PerfCounter bootstrapTime |
|
561 |
= PerfCounter.newPerfCounter("jdk.module.bootstrap.totalTime"); |
|
562 |
} |
|
563 |
} |