diff -r 741531c07ddd -r f9082fe892ac jdk/src/java.base/share/classes/java/lang/reflect/Module.java
--- a/jdk/src/java.base/share/classes/java/lang/reflect/Module.java Thu Apr 13 20:35:35 2017 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1591 +0,0 @@
-/*
- * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-package java.lang.reflect;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.lang.annotation.Annotation;
-import java.lang.module.Configuration;
-import java.lang.module.ModuleReference;
-import java.lang.module.ModuleDescriptor;
-import java.lang.module.ModuleDescriptor.Exports;
-import java.lang.module.ModuleDescriptor.Opens;
-import java.lang.module.ModuleDescriptor.Version;
-import java.lang.module.ResolvedModule;
-import java.net.URI;
-import java.net.URL;
-import java.security.AccessController;
-import java.security.PrivilegedAction;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Optional;
-import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.function.Function;
-import java.util.stream.Stream;
-
-import jdk.internal.loader.BuiltinClassLoader;
-import jdk.internal.loader.BootLoader;
-import jdk.internal.misc.JavaLangAccess;
-import jdk.internal.misc.JavaLangReflectModuleAccess;
-import jdk.internal.misc.SharedSecrets;
-import jdk.internal.module.ServicesCatalog;
-import jdk.internal.module.Resources;
-import jdk.internal.org.objectweb.asm.AnnotationVisitor;
-import jdk.internal.org.objectweb.asm.Attribute;
-import jdk.internal.org.objectweb.asm.ClassReader;
-import jdk.internal.org.objectweb.asm.ClassVisitor;
-import jdk.internal.org.objectweb.asm.ClassWriter;
-import jdk.internal.org.objectweb.asm.Opcodes;
-import jdk.internal.reflect.CallerSensitive;
-import jdk.internal.reflect.Reflection;
-import sun.security.util.SecurityConstants;
-
-/**
- * Represents a run-time module, either {@link #isNamed() named} or unnamed.
- *
- * Named modules have a {@link #getName() name} and are constructed by the
- * Java Virtual Machine when a graph of modules is defined to the Java virtual
- * machine to create a module {@link Layer Layer}.
- *
- * An unnamed module does not have a name. There is an unnamed module for
- * each {@link ClassLoader ClassLoader}, obtained by invoking its {@link
- * ClassLoader#getUnnamedModule() getUnnamedModule} method. All types that are
- * not in a named module are members of their defining class loader's unnamed
- * module.
- *
- * The package names that are parameters or returned by methods defined in
- * this class are the fully-qualified names of the packages as defined in
- * section 6.5.3 of The Java™ Language Specification, for
- * example, {@code "java.lang"}.
- *
- * Unless otherwise specified, passing a {@code null} argument to a method
- * in this class causes a {@link NullPointerException NullPointerException} to
- * be thrown.
- *
- * @since 9
- * @spec JPMS
- * @see java.lang.Class#getModule
- */
-
-public final class Module implements AnnotatedElement {
-
- // the layer that contains this module, can be null
- private final Layer layer;
-
- // module name and loader, these fields are read by VM
- private final String name;
- private final ClassLoader loader;
-
- // the module descriptor
- private final ModuleDescriptor descriptor;
-
-
- /**
- * Creates a new named Module. The resulting Module will be defined to the
- * VM but will not read any other modules, will not have any exports setup
- * and will not be registered in the service catalog.
- */
- private Module(Layer layer,
- ClassLoader loader,
- ModuleDescriptor descriptor,
- URI uri)
- {
- this.layer = layer;
- this.name = descriptor.name();
- this.loader = loader;
- this.descriptor = descriptor;
-
- // define module to VM
-
- boolean isOpen = descriptor.isOpen();
- Version version = descriptor.version().orElse(null);
- String vs = Objects.toString(version, null);
- String loc = Objects.toString(uri, null);
- String[] packages = descriptor.packages().toArray(new String[0]);
- defineModule0(this, isOpen, vs, loc, packages);
- }
-
-
- /**
- * Create the unnamed Module for the given ClassLoader.
- *
- * @see ClassLoader#getUnnamedModule
- */
- private Module(ClassLoader loader) {
- this.layer = null;
- this.name = null;
- this.loader = loader;
- this.descriptor = null;
- }
-
-
- /**
- * Creates a named module but without defining the module to the VM.
- *
- * @apiNote This constructor is for VM white-box testing.
- */
- Module(ClassLoader loader, ModuleDescriptor descriptor) {
- this.layer = null;
- this.name = descriptor.name();
- this.loader = loader;
- this.descriptor = descriptor;
- }
-
-
-
- /**
- * Returns {@code true} if this module is a named module.
- *
- * @return {@code true} if this is a named module
- *
- * @see ClassLoader#getUnnamedModule()
- */
- public boolean isNamed() {
- return name != null;
- }
-
- /**
- * Returns the module name or {@code null} if this module is an unnamed
- * module.
- *
- * @return The module name
- */
- public String getName() {
- return name;
- }
-
- /**
- * Returns the {@code ClassLoader} for this module.
- *
- * If there is a security manager then its {@code checkPermission}
- * method if first called with a {@code RuntimePermission("getClassLoader")}
- * permission to check that the caller is allowed to get access to the
- * class loader.
- *
- * @return The class loader for this module
- *
- * @throws SecurityException
- * If denied by the security manager
- */
- public ClassLoader getClassLoader() {
- SecurityManager sm = System.getSecurityManager();
- if (sm != null) {
- sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
- }
- return loader;
- }
-
- /**
- * Returns the module descriptor for this module or {@code null} if this
- * module is an unnamed module.
- *
- * @return The module descriptor for this module
- */
- public ModuleDescriptor getDescriptor() {
- return descriptor;
- }
-
- /**
- * Returns the layer that contains this module or {@code null} if this
- * module is not in a layer.
- *
- * A module {@code Layer} contains named modules and therefore this
- * method always returns {@code null} when invoked on an unnamed module.
- *
- * Dynamic modules are named
- * modules that are generated at runtime. A dynamic module may or may
- * not be in a module Layer.
- *
- * @return The layer that contains this module
- *
- * @see Proxy
- */
- public Layer getLayer() {
- if (isNamed()) {
- Layer layer = this.layer;
- if (layer != null)
- return layer;
-
- // special-case java.base as it is created before the boot Layer
- if (loader == null && name.equals("java.base")) {
- return SharedSecrets.getJavaLangAccess().getBootLayer();
- }
- }
-
- return null;
- }
-
-
- // --
-
- // special Module to mean "all unnamed modules"
- private static final Module ALL_UNNAMED_MODULE = new Module(null);
-
- // special Module to mean "everyone"
- private static final Module EVERYONE_MODULE = new Module(null);
-
- // set contains EVERYONE_MODULE, used when a package is opened or
- // exported unconditionally
- private static final Set EVERYONE_SET = Set.of(EVERYONE_MODULE);
-
-
- // -- readability --
-
- // the modules that this module reads
- private volatile Set reads;
-
- // additional module (2nd key) that some module (1st key) reflectively reads
- private static final WeakPairMap reflectivelyReads
- = new WeakPairMap<>();
-
-
- /**
- * Indicates if this module reads the given module. This method returns
- * {@code true} if invoked to test if this module reads itself. It also
- * returns {@code true} if invoked on an unnamed module (as unnamed
- * modules read all modules).
- *
- * @param other
- * The other module
- *
- * @return {@code true} if this module reads {@code other}
- *
- * @see #addReads(Module)
- */
- public boolean canRead(Module other) {
- Objects.requireNonNull(other);
-
- // an unnamed module reads all modules
- if (!this.isNamed())
- return true;
-
- // all modules read themselves
- if (other == this)
- return true;
-
- // check if this module reads other
- if (other.isNamed()) {
- Set reads = this.reads; // volatile read
- if (reads != null && reads.contains(other))
- return true;
- }
-
- // check if this module reads the other module reflectively
- if (reflectivelyReads.containsKeyPair(this, other))
- return true;
-
- // if other is an unnamed module then check if this module reads
- // all unnamed modules
- if (!other.isNamed()
- && reflectivelyReads.containsKeyPair(this, ALL_UNNAMED_MODULE))
- return true;
-
- return false;
- }
-
- /**
- * If the caller's module is this module then update this module to read
- * the given module.
- *
- * This method is a no-op if {@code other} is this module (all modules read
- * themselves), this module is an unnamed module (as unnamed modules read
- * all modules), or this module already reads {@code other}.
- *
- * @implNote Read edges added by this method are weak and
- * do not prevent {@code other} from being GC'ed when this module is
- * strongly reachable.
- *
- * @param other
- * The other module
- *
- * @return this module
- *
- * @throws IllegalCallerException
- * If this is a named module and the caller's module is not this
- * module
- *
- * @see #canRead
- */
- @CallerSensitive
- public Module addReads(Module other) {
- Objects.requireNonNull(other);
- if (this.isNamed()) {
- Module caller = Reflection.getCallerClass().getModule();
- if (caller != this) {
- throw new IllegalCallerException(caller + " != " + this);
- }
- implAddReads(other, true);
- }
- return this;
- }
-
- /**
- * Updates this module to read another module.
- *
- * @apiNote This method is for Proxy use and white-box testing.
- */
- void implAddReads(Module other) {
- implAddReads(other, true);
- }
-
- /**
- * Updates this module to read another module without notifying the VM.
- *
- * @apiNote This method is for VM white-box testing.
- */
- void implAddReadsNoSync(Module other) {
- implAddReads(other, false);
- }
-
- /**
- * Makes the given {@code Module} readable to this module.
- *
- * If {@code syncVM} is {@code true} then the VM is notified.
- */
- private void implAddReads(Module other, boolean syncVM) {
- if (!canRead(other)) {
- // update VM first, just in case it fails
- if (syncVM) {
- if (other == ALL_UNNAMED_MODULE) {
- addReads0(this, null);
- } else {
- addReads0(this, other);
- }
- }
-
- // add reflective read
- reflectivelyReads.putIfAbsent(this, other, Boolean.TRUE);
- }
- }
-
-
- // -- exported and open packages --
-
- // the packages are open to other modules, can be null
- // if the value contains EVERYONE_MODULE then the package is open to all
- private volatile Map> openPackages;
-
- // the packages that are exported, can be null
- // if the value contains EVERYONE_MODULE then the package is exported to all
- private volatile Map> exportedPackages;
-
- // additional exports or opens added at run-time
- // this module (1st key), other module (2nd key)
- // (package name, open?) (value)
- private static final WeakPairMap>
- reflectivelyExports = new WeakPairMap<>();
-
-
- /**
- * Returns {@code true} if this module exports the given package to at
- * least the given module.
- *
- * This method returns {@code true} if invoked to test if a package in
- * this module is exported to itself. It always returns {@code true} when
- * invoked on an unnamed module. A package that is {@link #isOpen open} to
- * the given module is considered exported to that module at run-time and
- * so this method returns {@code true} if the package is open to the given
- * module.
- *
- * This method does not check if the given module reads this module.
- *
- * @param pn
- * The package name
- * @param other
- * The other module
- *
- * @return {@code true} if this module exports the package to at least the
- * given module
- *
- * @see ModuleDescriptor#exports()
- * @see #addExports(String,Module)
- */
- public boolean isExported(String pn, Module other) {
- Objects.requireNonNull(pn);
- Objects.requireNonNull(other);
- return implIsExportedOrOpen(pn, other, /*open*/false);
- }
-
- /**
- * Returns {@code true} if this module has opened a package to at
- * least the given module.
- *
- * This method returns {@code true} if invoked to test if a package in
- * this module is open to itself. It returns {@code true} when invoked on an
- * {@link ModuleDescriptor#isOpen open} module with a package in the module.
- * It always returns {@code true} when invoked on an unnamed module.
- *
- * This method does not check if the given module reads this module.
- *
- * @param pn
- * The package name
- * @param other
- * The other module
- *
- * @return {@code true} if this module has opened the package
- * to at least the given module
- *
- * @see ModuleDescriptor#opens()
- * @see #addOpens(String,Module)
- * @see AccessibleObject#setAccessible(boolean)
- * @see java.lang.invoke.MethodHandles#privateLookupIn
- */
- public boolean isOpen(String pn, Module other) {
- Objects.requireNonNull(pn);
- Objects.requireNonNull(other);
- return implIsExportedOrOpen(pn, other, /*open*/true);
- }
-
- /**
- * Returns {@code true} if this module exports the given package
- * unconditionally.
- *
- * This method always returns {@code true} when invoked on an unnamed
- * module. A package that is {@link #isOpen(String) opened} unconditionally
- * is considered exported unconditionally at run-time and so this method
- * returns {@code true} if the package is opened unconditionally.
- *
- * This method does not check if the given module reads this module.
- *
- * @param pn
- * The package name
- *
- * @return {@code true} if this module exports the package unconditionally
- *
- * @see ModuleDescriptor#exports()
- */
- public boolean isExported(String pn) {
- Objects.requireNonNull(pn);
- return implIsExportedOrOpen(pn, EVERYONE_MODULE, /*open*/false);
- }
-
- /**
- * Returns {@code true} if this module has opened a package
- * unconditionally.
- *
- * This method always returns {@code true} when invoked on an unnamed
- * module. Additionally, it always returns {@code true} when invoked on an
- * {@link ModuleDescriptor#isOpen open} module with a package in the
- * module.
- *
- * This method does not check if the given module reads this module.
- *
- * @param pn
- * The package name
- *
- * @return {@code true} if this module has opened the package
- * unconditionally
- *
- * @see ModuleDescriptor#opens()
- */
- public boolean isOpen(String pn) {
- Objects.requireNonNull(pn);
- return implIsExportedOrOpen(pn, EVERYONE_MODULE, /*open*/true);
- }
-
-
- /**
- * Returns {@code true} if this module exports or opens the given package
- * to the given module. If the other module is {@code EVERYONE_MODULE} then
- * this method tests if the package is exported or opened unconditionally.
- */
- private boolean implIsExportedOrOpen(String pn, Module other, boolean open) {
- // all packages in unnamed modules are open
- if (!isNamed())
- return true;
-
- // all packages are exported/open to self
- if (other == this && containsPackage(pn))
- return true;
-
- // all packages in open and automatic modules are open
- if (descriptor.isOpen() || descriptor.isAutomatic())
- return containsPackage(pn);
-
- // exported/opened via module declaration/descriptor
- if (isStaticallyExportedOrOpen(pn, other, open))
- return true;
-
- // exported via addExports/addOpens
- if (isReflectivelyExportedOrOpen(pn, other, open))
- return true;
-
- // not exported or open to other
- return false;
- }
-
- /**
- * Returns {@code true} if this module exports or opens a package to
- * the given module via its module declaration.
- */
- private boolean isStaticallyExportedOrOpen(String pn, Module other, boolean open) {
- // package is open to everyone or
- Map> openPackages = this.openPackages;
- if (openPackages != null) {
- Set targets = openPackages.get(pn);
- if (targets != null) {
- if (targets.contains(EVERYONE_MODULE))
- return true;
- if (other != EVERYONE_MODULE && targets.contains(other))
- return true;
- }
- }
-
- if (!open) {
- // package is exported to everyone or
- Map> exportedPackages = this.exportedPackages;
- if (exportedPackages != null) {
- Set targets = exportedPackages.get(pn);
- if (targets != null) {
- if (targets.contains(EVERYONE_MODULE))
- return true;
- if (other != EVERYONE_MODULE && targets.contains(other))
- return true;
- }
- }
- }
-
- return false;
- }
-
-
- /**
- * Returns {@code true} if this module reflectively exports or opens given
- * package package to the given module.
- */
- private boolean isReflectivelyExportedOrOpen(String pn, Module other, boolean open) {
- // exported or open to all modules
- Map exports = reflectivelyExports.get(this, EVERYONE_MODULE);
- if (exports != null) {
- Boolean b = exports.get(pn);
- if (b != null) {
- boolean isOpen = b.booleanValue();
- if (!open || isOpen) return true;
- }
- }
-
- if (other != EVERYONE_MODULE) {
-
- // exported or open to other
- exports = reflectivelyExports.get(this, other);
- if (exports != null) {
- Boolean b = exports.get(pn);
- if (b != null) {
- boolean isOpen = b.booleanValue();
- if (!open || isOpen) return true;
- }
- }
-
- // other is an unnamed module && exported or open to all unnamed
- if (!other.isNamed()) {
- exports = reflectivelyExports.get(this, ALL_UNNAMED_MODULE);
- if (exports != null) {
- Boolean b = exports.get(pn);
- if (b != null) {
- boolean isOpen = b.booleanValue();
- if (!open || isOpen) return true;
- }
- }
- }
-
- }
-
- return false;
- }
-
-
- /**
- * If the caller's module is this module then update this module to export
- * the given package to the given module.
- *
- * This method has no effect if the package is already exported (or
- * open) to the given module.
- *
- * @apiNote As specified in section 5.4.3 of the The Java™
- * Virtual Machine Specification , if an attempt to resolve a
- * symbolic reference fails because of a linkage error, then subsequent
- * attempts to resolve the reference always fail with the same error that
- * was thrown as a result of the initial resolution attempt.
- *
- * @param pn
- * The package name
- * @param other
- * The module
- *
- * @return this module
- *
- * @throws IllegalArgumentException
- * If {@code pn} is {@code null}, or this is a named module and the
- * package {@code pn} is not a package in this module
- * @throws IllegalCallerException
- * If this is a named module and the caller's module is not this
- * module
- *
- * @jvms 5.4.3 Resolution
- * @see #isExported(String,Module)
- */
- @CallerSensitive
- public Module addExports(String pn, Module other) {
- if (pn == null)
- throw new IllegalArgumentException("package is null");
- Objects.requireNonNull(other);
-
- if (isNamed()) {
- Module caller = Reflection.getCallerClass().getModule();
- if (caller != this) {
- throw new IllegalCallerException(caller + " != " + this);
- }
- implAddExportsOrOpens(pn, other, /*open*/false, /*syncVM*/true);
- }
-
- return this;
- }
-
- /**
- * If this module has opened a package to at least the caller
- * module then update this module to open the package to the given module.
- * Opening a package with this method allows all types in the package,
- * and all their members, not just public types and their public members,
- * to be reflected on by the given module when using APIs that support
- * private access or a way to bypass or suppress default Java language
- * access control checks.
- *
- * This method has no effect if the package is already open
- * to the given module.
- *
- * @param pn
- * The package name
- * @param other
- * The module
- *
- * @return this module
- *
- * @throws IllegalArgumentException
- * If {@code pn} is {@code null}, or this is a named module and the
- * package {@code pn} is not a package in this module
- * @throws IllegalCallerException
- * If this is a named module and this module has not opened the
- * package to at least the caller's module
- *
- * @see #isOpen(String,Module)
- * @see AccessibleObject#setAccessible(boolean)
- * @see java.lang.invoke.MethodHandles#privateLookupIn
- */
- @CallerSensitive
- public Module addOpens(String pn, Module other) {
- if (pn == null)
- throw new IllegalArgumentException("package is null");
- Objects.requireNonNull(other);
-
- if (isNamed()) {
- Module caller = Reflection.getCallerClass().getModule();
- if (caller != this && !isOpen(pn, caller))
- throw new IllegalCallerException(pn + " is not open to " + caller);
- implAddExportsOrOpens(pn, other, /*open*/true, /*syncVM*/true);
- }
-
- return this;
- }
-
-
- /**
- * Updates the exports so that package {@code pn} is exported to module
- * {@code other} but without notifying the VM.
- *
- * @apiNote This method is for VM white-box testing.
- */
- void implAddExportsNoSync(String pn, Module other) {
- if (other == null)
- other = EVERYONE_MODULE;
- implAddExportsOrOpens(pn.replace('/', '.'), other, false, false);
- }
-
- /**
- * Updates the exports so that package {@code pn} is exported to module
- * {@code other}.
- *
- * @apiNote This method is for white-box testing.
- */
- void implAddExports(String pn, Module other) {
- implAddExportsOrOpens(pn, other, false, true);
- }
-
- /**
- * Updates the module to open package {@code pn} to module {@code other}.
- *
- * @apiNote This method is for white-box tests and jtreg
- */
- void implAddOpens(String pn, Module other) {
- implAddExportsOrOpens(pn, other, true, true);
- }
-
- /**
- * Updates a module to export or open a module to another module.
- *
- * If {@code syncVM} is {@code true} then the VM is notified.
- */
- private void implAddExportsOrOpens(String pn,
- Module other,
- boolean open,
- boolean syncVM) {
- Objects.requireNonNull(other);
- Objects.requireNonNull(pn);
-
- // all packages are open in unnamed, open, and automatic modules
- if (!isNamed() || descriptor.isOpen() || descriptor.isAutomatic())
- return;
-
- // nothing to do if already exported/open to other
- if (implIsExportedOrOpen(pn, other, open))
- return;
-
- // can only export a package in the module
- if (!containsPackage(pn)) {
- throw new IllegalArgumentException("package " + pn
- + " not in contents");
- }
-
- // update VM first, just in case it fails
- if (syncVM) {
- if (other == EVERYONE_MODULE) {
- addExportsToAll0(this, pn);
- } else if (other == ALL_UNNAMED_MODULE) {
- addExportsToAllUnnamed0(this, pn);
- } else {
- addExports0(this, pn, other);
- }
- }
-
- // add package name to reflectivelyExports if absent
- Map map = reflectivelyExports
- .computeIfAbsent(this, other,
- (m1, m2) -> new ConcurrentHashMap<>());
-
- if (open) {
- map.put(pn, Boolean.TRUE); // may need to promote from FALSE to TRUE
- } else {
- map.putIfAbsent(pn, Boolean.FALSE);
- }
- }
-
-
- // -- services --
-
- // additional service type (2nd key) that some module (1st key) uses
- private static final WeakPairMap, Boolean> reflectivelyUses
- = new WeakPairMap<>();
-
- /**
- * If the caller's module is this module then update this module to add a
- * service dependence on the given service type. This method is intended
- * for use by frameworks that invoke {@link java.util.ServiceLoader
- * ServiceLoader} on behalf of other modules or where the framework is
- * passed a reference to the service type by other code. This method is
- * a no-op when invoked on an unnamed module or an automatic module.
- *
- * This method does not cause {@link Configuration#resolveAndBind
- * resolveAndBind} to be re-run.
- *
- * @param service
- * The service type
- *
- * @return this module
- *
- * @throws IllegalCallerException
- * If this is a named module and the caller's module is not this
- * module
- *
- * @see #canUse(Class)
- * @see ModuleDescriptor#uses()
- */
- @CallerSensitive
- public Module addUses(Class service) {
- Objects.requireNonNull(service);
-
- if (isNamed() && !descriptor.isAutomatic()) {
- Module caller = Reflection.getCallerClass().getModule();
- if (caller != this) {
- throw new IllegalCallerException(caller + " != " + this);
- }
- implAddUses(service);
- }
-
- return this;
- }
-
- /**
- * Update this module to add a service dependence on the given service
- * type.
- */
- void implAddUses(Class service) {
- if (!canUse(service)) {
- reflectivelyUses.putIfAbsent(this, service, Boolean.TRUE);
- }
- }
-
-
- /**
- * Indicates if this module has a service dependence on the given service
- * type. This method always returns {@code true} when invoked on an unnamed
- * module or an automatic module.
- *
- * @param service
- * The service type
- *
- * @return {@code true} if this module uses service type {@code st}
- *
- * @see #addUses(Class)
- */
- public boolean canUse(Class service) {
- Objects.requireNonNull(service);
-
- if (!isNamed())
- return true;
-
- if (descriptor.isAutomatic())
- return true;
-
- // uses was declared
- if (descriptor.uses().contains(service.getName()))
- return true;
-
- // uses added via addUses
- return reflectivelyUses.containsKeyPair(this, service);
- }
-
-
-
- // -- packages --
-
- // Additional packages that are added to the module at run-time.
- private volatile Map extraPackages;
-
- private boolean containsPackage(String pn) {
- if (descriptor.packages().contains(pn))
- return true;
- Map extraPackages = this.extraPackages;
- if (extraPackages != null && extraPackages.containsKey(pn))
- return true;
- return false;
- }
-
-
- /**
- * Returns an array of the package names of the packages in this module.
- *
- * For named modules, the returned array contains an element for each
- * package in the module.
- *
- * For unnamed modules, this method is the equivalent to invoking the
- * {@link ClassLoader#getDefinedPackages() getDefinedPackages} method of
- * this module's class loader and returning the array of package names.
- *
- * A package name appears at most once in the returned array.
- *
- * @apiNote This method returns an array rather than a {@code Set} for
- * consistency with other {@code java.lang.reflect} types.
- *
- * @return an array of the package names of the packages in this module
- */
- public String[] getPackages() {
- if (isNamed()) {
-
- Set packages = descriptor.packages();
- Map extraPackages = this.extraPackages;
- if (extraPackages == null) {
- return packages.toArray(new String[0]);
- } else {
- return Stream.concat(packages.stream(),
- extraPackages.keySet().stream())
- .toArray(String[]::new);
- }
-
- } else {
- // unnamed module
- Stream packages;
- if (loader == null) {
- packages = BootLoader.packages();
- } else {
- packages = SharedSecrets.getJavaLangAccess().packages(loader);
- }
- return packages.map(Package::getName).toArray(String[]::new);
- }
- }
-
- /**
- * Add a package to this module without notifying the VM.
- *
- * @apiNote This method is VM white-box testing.
- */
- void implAddPackageNoSync(String pn) {
- implAddPackage(pn.replace('/', '.'), false);
- }
-
- /**
- * Add a package to this module.
- *
- * If {@code syncVM} is {@code true} then the VM is notified. This method is
- * a no-op if this is an unnamed module or the module already contains the
- * package.
- *
- * @throws IllegalArgumentException if the package name is not legal
- * @throws IllegalStateException if the package is defined to another module
- */
- private void implAddPackage(String pn, boolean syncVM) {
- // no-op if unnamed module
- if (!isNamed())
- return;
-
- // no-op if module contains the package
- if (containsPackage(pn))
- return;
-
- // check package name is legal for named modules
- if (pn.isEmpty())
- throw new IllegalArgumentException("Cannot add package");
- for (int i=0; i extraPackages = this.extraPackages;
- if (extraPackages == null) {
- synchronized (this) {
- extraPackages = this.extraPackages;
- if (extraPackages == null)
- this.extraPackages = extraPackages = new ConcurrentHashMap<>();
- }
- }
-
- // update VM first in case it fails. This is a no-op if another thread
- // beats us to add the package first
- if (syncVM) {
- // throws IllegalStateException if defined to another module
- addPackage0(this, pn);
- if (descriptor.isOpen() || descriptor.isAutomatic()) {
- addExportsToAll0(this, pn);
- }
- }
- extraPackages.putIfAbsent(pn, Boolean.TRUE);
- }
-
-
- // -- creating Module objects --
-
- /**
- * Defines all module in a configuration to the runtime.
- *
- * @return a map of module name to runtime {@code Module}
- *
- * @throws IllegalArgumentException
- * If defining any of the modules to the VM fails
- */
- static Map defineModules(Configuration cf,
- Function clf,
- Layer layer)
- {
- Map nameToModule = new HashMap<>();
- Map moduleToLoader = new HashMap<>();
-
- boolean isBootLayer = (Layer.boot() == null);
- Set loaders = new HashSet<>();
-
- // map each module to a class loader
- for (ResolvedModule resolvedModule : cf.modules()) {
- String name = resolvedModule.name();
- ClassLoader loader = clf.apply(name);
- if (loader != null) {
- moduleToLoader.put(name, loader);
- loaders.add(loader);
- } else if (!isBootLayer) {
- throw new IllegalArgumentException("loader can't be 'null'");
- }
- }
-
- // define each module in the configuration to the VM
- for (ResolvedModule resolvedModule : cf.modules()) {
- ModuleReference mref = resolvedModule.reference();
- ModuleDescriptor descriptor = mref.descriptor();
- String name = descriptor.name();
- URI uri = mref.location().orElse(null);
- ClassLoader loader = moduleToLoader.get(resolvedModule.name());
- Module m;
- if (loader == null && isBootLayer && name.equals("java.base")) {
- // java.base is already defined to the VM
- m = Object.class.getModule();
- } else {
- m = new Module(layer, loader, descriptor, uri);
- }
- nameToModule.put(name, m);
- moduleToLoader.put(name, loader);
- }
-
- // setup readability and exports
- for (ResolvedModule resolvedModule : cf.modules()) {
- ModuleReference mref = resolvedModule.reference();
- ModuleDescriptor descriptor = mref.descriptor();
-
- String mn = descriptor.name();
- Module m = nameToModule.get(mn);
- assert m != null;
-
- // reads
- Set reads = new HashSet<>();
-
- // name -> source Module when in parent layer
- Map nameToSource = Collections.emptyMap();
-
- for (ResolvedModule other : resolvedModule.reads()) {
- Module m2 = null;
- if (other.configuration() == cf) {
- // this configuration
- m2 = nameToModule.get(other.name());
- assert m2 != null;
- } else {
- // parent layer
- for (Layer parent: layer.parents()) {
- m2 = findModule(parent, other);
- if (m2 != null)
- break;
- }
- assert m2 != null;
- if (nameToSource.isEmpty())
- nameToSource = new HashMap<>();
- nameToSource.put(other.name(), m2);
- }
- reads.add(m2);
-
- // update VM view
- addReads0(m, m2);
- }
- m.reads = reads;
-
- // automatic modules read all unnamed modules
- if (descriptor.isAutomatic()) {
- m.implAddReads(ALL_UNNAMED_MODULE, true);
- }
-
- // exports and opens
- initExportsAndOpens(m, nameToSource, nameToModule, layer.parents());
- }
-
- // register the modules in the boot layer
- if (isBootLayer) {
- for (ResolvedModule resolvedModule : cf.modules()) {
- ModuleReference mref = resolvedModule.reference();
- ModuleDescriptor descriptor = mref.descriptor();
- if (!descriptor.provides().isEmpty()) {
- String name = descriptor.name();
- Module m = nameToModule.get(name);
- ClassLoader loader = moduleToLoader.get(name);
- ServicesCatalog catalog;
- if (loader == null) {
- catalog = BootLoader.getServicesCatalog();
- } else {
- catalog = ServicesCatalog.getServicesCatalog(loader);
- }
- catalog.register(m);
- }
- }
- }
-
- // record that there is a layer with modules defined to the class loader
- for (ClassLoader loader : loaders) {
- layer.bindToLoader(loader);
- }
-
- return nameToModule;
- }
-
-
- /**
- * Find the runtime Module corresponding to the given ResolvedModule
- * in the given parent layer (or its parents).
- */
- private static Module findModule(Layer parent, ResolvedModule resolvedModule) {
- Configuration cf = resolvedModule.configuration();
- String dn = resolvedModule.name();
- return parent.layers()
- .filter(l -> l.configuration() == cf)
- .findAny()
- .map(layer -> {
- Optional om = layer.findModule(dn);
- assert om.isPresent() : dn + " not found in layer";
- Module m = om.get();
- assert m.getLayer() == layer : m + " not in expected layer";
- return m;
- })
- .orElse(null);
- }
-
-
- /**
- * Initialize the maps of exported and open packages for module m.
- */
- private static void initExportsAndOpens(Module m,
- Map nameToSource,
- Map nameToModule,
- List parents) {
- // The VM doesn't special case open or automatic modules so need to
- // export all packages
- ModuleDescriptor descriptor = m.getDescriptor();
- if (descriptor.isOpen() || descriptor.isAutomatic()) {
- assert descriptor.opens().isEmpty();
- for (String source : descriptor.packages()) {
- addExportsToAll0(m, source);
- }
- return;
- }
-
- Map> openPackages = new HashMap<>();
- Map> exportedPackages = new HashMap<>();
-
- // process the open packages first
- for (Opens opens : descriptor.opens()) {
- String source = opens.source();
-
- if (opens.isQualified()) {
- // qualified opens
- Set targets = new HashSet<>();
- for (String target : opens.targets()) {
- Module m2 = findModule(target, nameToSource, nameToModule, parents);
- if (m2 != null) {
- addExports0(m, source, m2);
- targets.add(m2);
- }
- }
- if (!targets.isEmpty()) {
- openPackages.put(source, targets);
- }
- } else {
- // unqualified opens
- addExportsToAll0(m, source);
- openPackages.put(source, EVERYONE_SET);
- }
- }
-
- // next the exports, skipping exports when the package is open
- for (Exports exports : descriptor.exports()) {
- String source = exports.source();
-
- // skip export if package is already open to everyone
- Set openToTargets = openPackages.get(source);
- if (openToTargets != null && openToTargets.contains(EVERYONE_MODULE))
- continue;
-
- if (exports.isQualified()) {
- // qualified exports
- Set targets = new HashSet<>();
- for (String target : exports.targets()) {
- Module m2 = findModule(target, nameToSource, nameToModule, parents);
- if (m2 != null) {
- // skip qualified export if already open to m2
- if (openToTargets == null || !openToTargets.contains(m2)) {
- addExports0(m, source, m2);
- targets.add(m2);
- }
- }
- }
- if (!targets.isEmpty()) {
- exportedPackages.put(source, targets);
- }
-
- } else {
- // unqualified exports
- addExportsToAll0(m, source);
- exportedPackages.put(source, EVERYONE_SET);
- }
- }
-
- if (!openPackages.isEmpty())
- m.openPackages = openPackages;
- if (!exportedPackages.isEmpty())
- m.exportedPackages = exportedPackages;
- }
-
- /**
- * Find the runtime Module with the given name. The module name is the
- * name of a target module in a qualified exports or opens directive.
- *
- * @param target The target module to find
- * @param nameToSource The modules in parent layers that are read
- * @param nameToModule The modules in the layer under construction
- * @param parents The parent layers
- */
- private static Module findModule(String target,
- Map nameToSource,
- Map nameToModule,
- List parents) {
- Module m = nameToSource.get(target);
- if (m == null) {
- m = nameToModule.get(target);
- if (m == null) {
- for (Layer parent : parents) {
- m = parent.findModule(target).orElse(null);
- if (m != null) break;
- }
- }
- }
- return m;
- }
-
-
- // -- annotations --
-
- /**
- * {@inheritDoc}
- * This method returns {@code null} when invoked on an unnamed module.
- */
- @Override
- public T getAnnotation(Class annotationClass) {
- return moduleInfoClass().getDeclaredAnnotation(annotationClass);
- }
-
- /**
- * {@inheritDoc}
- * This method returns an empty array when invoked on an unnamed module.
- */
- @Override
- public Annotation[] getAnnotations() {
- return moduleInfoClass().getAnnotations();
- }
-
- /**
- * {@inheritDoc}
- * This method returns an empty array when invoked on an unnamed module.
- */
- @Override
- public Annotation[] getDeclaredAnnotations() {
- return moduleInfoClass().getDeclaredAnnotations();
- }
-
- // cached class file with annotations
- private volatile Class moduleInfoClass;
-
- private Class moduleInfoClass() {
- Class clazz = this.moduleInfoClass;
- if (clazz != null)
- return clazz;
-
- synchronized (this) {
- clazz = this.moduleInfoClass;
- if (clazz == null) {
- if (isNamed()) {
- PrivilegedAction> pa = this::loadModuleInfoClass;
- clazz = AccessController.doPrivileged(pa);
- }
- if (clazz == null) {
- class DummyModuleInfo { }
- clazz = DummyModuleInfo.class;
- }
- this.moduleInfoClass = clazz;
- }
- return clazz;
- }
- }
-
- private Class loadModuleInfoClass() {
- Class clazz = null;
- try (InputStream in = getResourceAsStream("module-info.class")) {
- if (in != null)
- clazz = loadModuleInfoClass(in);
- } catch (Exception ignore) { }
- return clazz;
- }
-
- /**
- * Loads module-info.class as a package-private interface in a class loader
- * that is a child of this module's class loader.
- */
- private Class loadModuleInfoClass(InputStream in) throws IOException {
- final String MODULE_INFO = "module-info";
-
- ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS
- + ClassWriter.COMPUTE_FRAMES);
-
- ClassVisitor cv = new ClassVisitor(Opcodes.ASM5, cw) {
- @Override
- public void visit(int version,
- int access,
- String name,
- String signature,
- String superName,
- String[] interfaces) {
- cw.visit(version,
- Opcodes.ACC_INTERFACE
- + Opcodes.ACC_ABSTRACT
- + Opcodes.ACC_SYNTHETIC,
- MODULE_INFO,
- null,
- "java/lang/Object",
- null);
- }
- @Override
- public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
- // keep annotations
- return super.visitAnnotation(desc, visible);
- }
- @Override
- public void visitAttribute(Attribute attr) {
- // drop non-annotation attributes
- }
- };
-
- ClassReader cr = new ClassReader(in);
- cr.accept(cv, 0);
- byte[] bytes = cw.toByteArray();
-
- ClassLoader cl = new ClassLoader(loader) {
- @Override
- protected Class findClass(String cn)throws ClassNotFoundException {
- if (cn.equals(MODULE_INFO)) {
- return super.defineClass(cn, bytes, 0, bytes.length);
- } else {
- throw new ClassNotFoundException(cn);
- }
- }
- };
-
- try {
- return cl.loadClass(MODULE_INFO);
- } catch (ClassNotFoundException e) {
- throw new InternalError(e);
- }
- }
-
-
- // -- misc --
-
-
- /**
- * Returns an input stream for reading a resource in this module.
- * The {@code name} parameter is a {@code '/'}-separated path name that
- * identifies the resource. As with {@link Class#getResourceAsStream
- * Class.getResourceAsStream}, this method delegates to the module's class
- * loader {@link ClassLoader#findResource(String,String)
- * findResource(String,String)} method, invoking it with the module name
- * (or {@code null} when the module is unnamed) and the name of the
- * resource. If the resource name has a leading slash then it is dropped
- * before delegation.
- *
- * A resource in a named module may be encapsulated so that
- * it cannot be located by code in other modules. Whether a resource can be
- * located or not is determined as follows:
- *
- *
- * - If the resource name ends with "{@code .class}" then it is not
- * encapsulated.
- *
- * - A package name is derived from the resource name. If
- * the package name is a {@link #getPackages() package} in the module
- * then the resource can only be located by the caller of this method
- * when the package is {@link #isOpen(String,Module) open} to at least
- * the caller's module. If the resource is not in a package in the module
- * then the resource is not encapsulated.
- *
- *
- * In the above, the package name for a resource is derived
- * from the subsequence of characters that precedes the last {@code '/'} in
- * the name and then replacing each {@code '/'} character in the subsequence
- * with {@code '.'}. A leading slash is ignored when deriving the package
- * name. As an example, the package name derived for a resource named
- * "{@code a/b/c/foo.properties}" is "{@code a.b.c}". A resource name
- * with the name "{@code META-INF/MANIFEST.MF}" is never encapsulated
- * because "{@code META-INF}" is not a legal package name.
- *
- * This method returns {@code null} if the resource is not in this
- * module, the resource is encapsulated and cannot be located by the caller,
- * or access to the resource is denied by the security manager.
- *
- * @param name
- * The resource name
- *
- * @return An input stream for reading the resource or {@code null}
- *
- * @throws IOException
- * If an I/O error occurs
- *
- * @see Class#getResourceAsStream(String)
- */
- @CallerSensitive
- public InputStream getResourceAsStream(String name) throws IOException {
- if (name.startsWith("/")) {
- name = name.substring(1);
- }
-
- if (isNamed() && Resources.canEncapsulate(name)) {
- Module caller = Reflection.getCallerClass().getModule();
- if (caller != this && caller != Object.class.getModule()) {
- // ignore packages added for proxies via addPackage
- Set packages = getDescriptor().packages();
- String pn = Resources.toPackageName(name);
- if (packages.contains(pn) && !isOpen(pn, caller)) {
- // resource is in package not open to caller
- return null;
- }
- }
- }
-
- String mn = this.name;
-
- // special-case built-in class loaders to avoid URL connection
- if (loader == null) {
- return BootLoader.findResourceAsStream(mn, name);
- } else if (loader instanceof BuiltinClassLoader) {
- return ((BuiltinClassLoader) loader).findResourceAsStream(mn, name);
- }
-
- // locate resource in module
- JavaLangAccess jla = SharedSecrets.getJavaLangAccess();
- URL url = jla.findResource(loader, mn, name);
- if (url != null) {
- try {
- return url.openStream();
- } catch (SecurityException e) { }
- }
-
- return null;
- }
-
- /**
- * Returns the string representation of this module. For a named module,
- * the representation is the string {@code "module"}, followed by a space,
- * and then the module name. For an unnamed module, the representation is
- * the string {@code "unnamed module"}, followed by a space, and then an
- * implementation specific string that identifies the unnamed module.
- *
- * @return The string representation of this module
- */
- @Override
- public String toString() {
- if (isNamed()) {
- return "module " + name;
- } else {
- String id = Integer.toHexString(System.identityHashCode(this));
- return "unnamed module @" + id;
- }
- }
-
-
- // -- native methods --
-
- // JVM_DefineModule
- private static native void defineModule0(Module module,
- boolean isOpen,
- String version,
- String location,
- String[] pns);
-
- // JVM_AddReadsModule
- private static native void addReads0(Module from, Module to);
-
- // JVM_AddModuleExports
- private static native void addExports0(Module from, String pn, Module to);
-
- // JVM_AddModuleExportsToAll
- private static native void addExportsToAll0(Module from, String pn);
-
- // JVM_AddModuleExportsToAllUnnamed
- private static native void addExportsToAllUnnamed0(Module from, String pn);
-
- // JVM_AddModulePackage
- private static native void addPackage0(Module m, String pn);
-
- /**
- * Register shared secret to provide access to package-private methods
- */
- static {
- SharedSecrets.setJavaLangReflectModuleAccess(
- new JavaLangReflectModuleAccess() {
- @Override
- public Module defineUnnamedModule(ClassLoader loader) {
- return new Module(loader);
- }
- @Override
- public Module defineModule(ClassLoader loader,
- ModuleDescriptor descriptor,
- URI uri) {
- return new Module(null, loader, descriptor, uri);
- }
- @Override
- public void addReads(Module m1, Module m2) {
- m1.implAddReads(m2, true);
- }
- @Override
- public void addReadsAllUnnamed(Module m) {
- m.implAddReads(Module.ALL_UNNAMED_MODULE);
- }
- @Override
- public void addExports(Module m, String pn) {
- m.implAddExportsOrOpens(pn, Module.EVERYONE_MODULE, false, true);
- }
- @Override
- public void addExports(Module m, String pn, Module other) {
- m.implAddExportsOrOpens(pn, other, false, true);
- }
- @Override
- public void addExportsToAllUnnamed(Module m, String pn) {
- m.implAddExportsOrOpens(pn, Module.ALL_UNNAMED_MODULE, false, true);
- }
- @Override
- public void addOpens(Module m, String pn) {
- m.implAddExportsOrOpens(pn, Module.EVERYONE_MODULE, true, true);
- }
- @Override
- public void addOpens(Module m, String pn, Module other) {
- m.implAddExportsOrOpens(pn, other, true, true);
- }
- @Override
- public void addOpensToAllUnnamed(Module m, String pn) {
- m.implAddExportsOrOpens(pn, Module.ALL_UNNAMED_MODULE, true, true);
- }
- @Override
- public void addUses(Module m, Class service) {
- m.implAddUses(service);
- }
- @Override
- public ServicesCatalog getServicesCatalog(Layer layer) {
- return layer.getServicesCatalog();
- }
- @Override
- public Stream layers(Layer layer) {
- return layer.layers();
- }
- @Override
- public Stream layers(ClassLoader loader) {
- return Layer.layers(loader);
- }
- });
- }
-}