author | alanb |
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/* |
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* Copyright (c) 2015, 2017, 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.IOException; |
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import java.io.OutputStream; |
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import java.lang.module.ModuleDescriptor; |
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import java.nio.ByteBuffer; |
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import java.util.Map; |
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import java.util.stream.Stream; |
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import jdk.internal.org.objectweb.asm.ClassWriter; |
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import jdk.internal.org.objectweb.asm.ModuleVisitor; |
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import jdk.internal.org.objectweb.asm.Opcodes; |
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import jdk.internal.org.objectweb.asm.commons.ModuleResolutionAttribute; |
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import jdk.internal.org.objectweb.asm.commons.ModuleTargetAttribute; |
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import static jdk.internal.org.objectweb.asm.Opcodes.*; |
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/** |
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* Utility class to write a ModuleDescriptor as a module-info.class. |
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*/ |
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public final class ModuleInfoWriter { |
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private static final Map<ModuleDescriptor.Modifier, Integer> |
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MODULE_MODS_TO_FLAGS = Map.of( |
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ModuleDescriptor.Modifier.OPEN, ACC_OPEN, |
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ModuleDescriptor.Modifier.SYNTHETIC, ACC_SYNTHETIC, |
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ModuleDescriptor.Modifier.MANDATED, ACC_MANDATED |
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); |
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private static final Map<ModuleDescriptor.Requires.Modifier, Integer> |
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REQUIRES_MODS_TO_FLAGS = Map.of( |
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ModuleDescriptor.Requires.Modifier.TRANSITIVE, ACC_TRANSITIVE, |
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ModuleDescriptor.Requires.Modifier.STATIC, ACC_STATIC_PHASE, |
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ModuleDescriptor.Requires.Modifier.SYNTHETIC, ACC_SYNTHETIC, |
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ModuleDescriptor.Requires.Modifier.MANDATED, ACC_MANDATED |
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); |
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private static final Map<ModuleDescriptor.Exports.Modifier, Integer> |
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EXPORTS_MODS_TO_FLAGS = Map.of( |
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ModuleDescriptor.Exports.Modifier.SYNTHETIC, ACC_SYNTHETIC, |
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ModuleDescriptor.Exports.Modifier.MANDATED, ACC_MANDATED |
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); |
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private static final Map<ModuleDescriptor.Opens.Modifier, Integer> |
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OPENS_MODS_TO_FLAGS = Map.of( |
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ModuleDescriptor.Opens.Modifier.SYNTHETIC, ACC_SYNTHETIC, |
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ModuleDescriptor.Opens.Modifier.MANDATED, ACC_MANDATED |
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); |
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private static final String[] EMPTY_STRING_ARRAY = new String[0]; |
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private ModuleInfoWriter() { } |
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/** |
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* Writes the given module descriptor to a module-info.class file, |
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* returning it in a byte array. |
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*/ |
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private static byte[] toModuleInfo(ModuleDescriptor md, |
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ModuleResolution mres, |
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ModuleTarget target) { |
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ClassWriter cw = new ClassWriter(0); |
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cw.visit(Opcodes.V10, ACC_MODULE, "module-info", null, null, null); |
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int moduleFlags = md.modifiers().stream() |
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.map(MODULE_MODS_TO_FLAGS::get) |
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.reduce(0, (x, y) -> (x | y)); |
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String vs = md.rawVersion().orElse(null); |
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ModuleVisitor mv = cw.visitModule(md.name(), moduleFlags, vs); |
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// requires |
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for (ModuleDescriptor.Requires r : md.requires()) { |
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int flags = r.modifiers().stream() |
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.map(REQUIRES_MODS_TO_FLAGS::get) |
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.reduce(0, (x, y) -> (x | y)); |
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vs = r.rawCompiledVersion().orElse(null); |
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mv.visitRequire(r.name(), flags, vs); |
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} |
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// exports |
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for (ModuleDescriptor.Exports e : md.exports()) { |
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int flags = e.modifiers().stream() |
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.map(EXPORTS_MODS_TO_FLAGS::get) |
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.reduce(0, (x, y) -> (x | y)); |
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String[] targets = e.targets().toArray(EMPTY_STRING_ARRAY); |
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mv.visitExport(e.source().replace('.', '/'), flags, targets); |
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} |
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// opens |
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for (ModuleDescriptor.Opens opens : md.opens()) { |
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int flags = opens.modifiers().stream() |
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.map(OPENS_MODS_TO_FLAGS::get) |
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.reduce(0, (x, y) -> (x | y)); |
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String[] targets = opens.targets().toArray(EMPTY_STRING_ARRAY); |
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mv.visitOpen(opens.source().replace('.', '/'), flags, targets); |
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} |
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// uses |
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md.uses().stream().map(sn -> sn.replace('.', '/')).forEach(mv::visitUse); |
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// provides |
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for (ModuleDescriptor.Provides p : md.provides()) { |
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mv.visitProvide(p.service().replace('.', '/'), |
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p.providers() |
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.stream() |
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.map(pn -> pn.replace('.', '/')) |
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.toArray(String[]::new)); |
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} |
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// add the ModulePackages attribute when there are packages that aren't |
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// exported or open |
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Stream<String> exported = md.exports().stream() |
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.map(ModuleDescriptor.Exports::source); |
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Stream<String> open = md.opens().stream() |
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.map(ModuleDescriptor.Opens::source); |
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long exportedOrOpen = Stream.concat(exported, open).distinct().count(); |
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if (md.packages().size() > exportedOrOpen) { |
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md.packages().stream() |
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.map(pn -> pn.replace('.', '/')) |
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.forEach(mv::visitPackage); |
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} |
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// ModuleMainClass attribute |
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md.mainClass() |
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.map(mc -> mc.replace('.', '/')) |
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.ifPresent(mv::visitMainClass); |
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mv.visitEnd(); |
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// write ModuleResolution attribute if specified |
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if (mres != null) { |
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cw.visitAttribute(new ModuleResolutionAttribute(mres.value())); |
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} |
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// write ModuleTarget attribute if there is a target platform |
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if (target != null && target.targetPlatform().length() > 0) { |
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cw.visitAttribute(new ModuleTargetAttribute(target.targetPlatform())); |
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} |
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cw.visitEnd(); |
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return cw.toByteArray(); |
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} |
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/** |
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* Writes a module descriptor to the given output stream as a |
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* module-info.class. |
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*/ |
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public static void write(ModuleDescriptor descriptor, |
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ModuleResolution mres, |
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ModuleTarget target, |
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OutputStream out) |
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throws IOException |
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{ |
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byte[] bytes = toModuleInfo(descriptor, mres, target); |
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out.write(bytes); |
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} |
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/** |
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* Writes a module descriptor to the given output stream as a |
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* module-info.class. |
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*/ |
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public static void write(ModuleDescriptor descriptor, |
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ModuleResolution mres, |
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OutputStream out) |
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throws IOException |
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{ |
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write(descriptor, mres, null, out); |
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} |
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/** |
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* Writes a module descriptor to the given output stream as a |
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* module-info.class. |
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*/ |
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public static void write(ModuleDescriptor descriptor, |
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ModuleTarget target, |
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OutputStream out) |
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throws IOException |
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{ |
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write(descriptor, null, target, out); |
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} |
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/** |
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* Writes a module descriptor to the given output stream as a |
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* module-info.class. |
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*/ |
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public static void write(ModuleDescriptor descriptor, OutputStream out) |
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throws IOException |
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{ |
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write(descriptor, null, null, out); |
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} |
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/** |
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* Returns a {@code ByteBuffer} containing the given module descriptor |
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* in module-info.class format. |
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*/ |
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public static ByteBuffer toByteBuffer(ModuleDescriptor descriptor) { |
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byte[] bytes = toModuleInfo(descriptor, null, null); |
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return ByteBuffer.wrap(bytes); |
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} |
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} |