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src/java.base/share/classes/jdk/internal/module/ModuleInfoWriter.java

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rev 47453 : imported patch jdk-new-asm-update.patch


  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package jdk.internal.module;
  26 
  27 import java.io.IOException;
  28 import java.io.OutputStream;
  29 import java.lang.module.ModuleDescriptor;
  30 import java.nio.ByteBuffer;

  31 import java.util.stream.Stream;
  32 
  33 import jdk.internal.org.objectweb.asm.ClassWriter;

  34 import jdk.internal.org.objectweb.asm.Opcodes;


  35 
  36 import static jdk.internal.module.ClassFileAttributes.*;
  37 import static jdk.internal.module.ClassFileConstants.ACC_MODULE;
  38 
  39 /**
  40  * Utility class to write a ModuleDescriptor as a module-info.class.
  41  */
  42 
  43 public final class ModuleInfoWriter {
  44 





























  45     private ModuleInfoWriter() { }
  46 
  47     /**
  48      * Writes the given module descriptor to a module-info.class file,
  49      * returning it in a byte array.
  50      */
  51     private static byte[] toModuleInfo(ModuleDescriptor md, ModuleTarget target) {
  52         ClassWriter cw = new ClassWriter(0);
  53         cw.visit(Opcodes.V1_9, ACC_MODULE, "module-info", null, null, null);
  54         cw.visitAttribute(new ModuleAttribute(md));
  55 
  56         // for tests: write the ModulePackages attribute when there are packages
  57         // that aren't exported or open













































  58         Stream<String> exported = md.exports().stream()
  59                 .map(ModuleDescriptor.Exports::source);
  60         Stream<String> open = md.opens().stream()
  61                 .map(ModuleDescriptor.Opens::source);
  62         long exportedOrOpen = Stream.concat(exported, open).distinct().count();
  63         if (md.packages().size() > exportedOrOpen)
  64             cw.visitAttribute(new ModulePackagesAttribute(md.packages()));



  65 
  66         // write ModuleMainClass if the module has a main class
  67         md.mainClass().ifPresent(mc -> cw.visitAttribute(new ModuleMainClassAttribute(mc)));


  68 
  69         // write ModuleTarget if there is a target platform
  70         if (target != null) {


  71             cw.visitAttribute(new ModuleTargetAttribute(target.targetPlatform()));
  72         }
  73 
  74         cw.visitEnd();
  75         return cw.toByteArray();
  76     }
  77 
  78     /**
  79      * Writes a module descriptor to the given output stream as a
  80      * module-info.class.
  81      */
  82     public static void write(ModuleDescriptor descriptor,
  83                              ModuleTarget target,
  84                              OutputStream out)
  85         throws IOException
  86     {
  87         byte[] bytes = toModuleInfo(descriptor, target);
  88         out.write(bytes);
  89     }
  90 


  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package jdk.internal.module;
  26 
  27 import java.io.IOException;
  28 import java.io.OutputStream;
  29 import java.lang.module.ModuleDescriptor;
  30 import java.nio.ByteBuffer;
  31 import java.util.Map;
  32 import java.util.stream.Stream;
  33 
  34 import jdk.internal.org.objectweb.asm.ClassWriter;
  35 import jdk.internal.org.objectweb.asm.ModuleVisitor;
  36 import jdk.internal.org.objectweb.asm.Opcodes;
  37 import jdk.internal.org.objectweb.asm.commons.ModuleTargetAttribute;
  38 import static jdk.internal.org.objectweb.asm.Opcodes.*;
  39 



  40 /**
  41  * Utility class to write a ModuleDescriptor as a module-info.class.
  42  */
  43 
  44 public final class ModuleInfoWriter {
  45 
  46     private static final Map<ModuleDescriptor.Modifier, Integer>
  47         MODULE_MODS_TO_FLAGS = Map.of(
  48             ModuleDescriptor.Modifier.OPEN, ACC_OPEN,
  49             ModuleDescriptor.Modifier.SYNTHETIC, ACC_SYNTHETIC,
  50             ModuleDescriptor.Modifier.MANDATED, ACC_MANDATED
  51         );
  52 
  53     private static final Map<ModuleDescriptor.Requires.Modifier, Integer>
  54         REQUIRES_MODS_TO_FLAGS = Map.of(
  55             ModuleDescriptor.Requires.Modifier.TRANSITIVE, ACC_TRANSITIVE,
  56             ModuleDescriptor.Requires.Modifier.STATIC, ACC_STATIC_PHASE,
  57             ModuleDescriptor.Requires.Modifier.SYNTHETIC, ACC_SYNTHETIC,
  58             ModuleDescriptor.Requires.Modifier.MANDATED, ACC_MANDATED
  59         );
  60 
  61     private static final Map<ModuleDescriptor.Exports.Modifier, Integer>
  62         EXPORTS_MODS_TO_FLAGS = Map.of(
  63             ModuleDescriptor.Exports.Modifier.SYNTHETIC, ACC_SYNTHETIC,
  64             ModuleDescriptor.Exports.Modifier.MANDATED, ACC_MANDATED
  65         );
  66 
  67     private static final Map<ModuleDescriptor.Opens.Modifier, Integer>
  68         OPENS_MODS_TO_FLAGS = Map.of(
  69             ModuleDescriptor.Opens.Modifier.SYNTHETIC, ACC_SYNTHETIC,
  70             ModuleDescriptor.Opens.Modifier.MANDATED, ACC_MANDATED
  71         );
  72 
  73     private static final String[] EMPTY_STRING_ARRAY = new String[0];
  74 
  75     private ModuleInfoWriter() { }
  76 
  77     /**
  78      * Writes the given module descriptor to a module-info.class file,
  79      * returning it in a byte array.
  80      */
  81     private static byte[] toModuleInfo(ModuleDescriptor md, ModuleTarget target) {
  82         ClassWriter cw = new ClassWriter(0);
  83         cw.visit(Opcodes.V9, ACC_MODULE, "module-info", null, null, null);

  84 
  85         int moduleFlags = md.modifiers().stream()
  86                 .map(MODULE_MODS_TO_FLAGS::get)
  87                 .reduce(0, (x, y) -> (x | y));
  88         String vs = md.rawVersion().orElse(null);
  89         ModuleVisitor mv = cw.visitModule(md.name(), moduleFlags, vs);
  90 
  91         // requires
  92         for (ModuleDescriptor.Requires r : md.requires()) {
  93             int flags = r.modifiers().stream()
  94                     .map(REQUIRES_MODS_TO_FLAGS::get)
  95                     .reduce(0, (x, y) -> (x | y));
  96             vs = r.rawCompiledVersion().orElse(null);
  97             mv.visitRequire(r.name(), flags, vs);
  98         }
  99 
 100         // exports
 101         for (ModuleDescriptor.Exports e : md.exports()) {
 102             int flags = e.modifiers().stream()
 103                     .map(EXPORTS_MODS_TO_FLAGS::get)
 104                     .reduce(0, (x, y) -> (x | y));
 105             String[] targets = e.targets().toArray(EMPTY_STRING_ARRAY);
 106             mv.visitExport(e.source().replace('.', '/'), flags, targets);
 107         }
 108 
 109         // opens
 110         for (ModuleDescriptor.Opens opens : md.opens()) {
 111             int flags = opens.modifiers().stream()
 112                     .map(OPENS_MODS_TO_FLAGS::get)
 113                     .reduce(0, (x, y) -> (x | y));
 114             String[] targets = opens.targets().toArray(EMPTY_STRING_ARRAY);
 115             mv.visitOpen(opens.source().replace('.', '/'), flags, targets);
 116         }
 117 
 118         // uses
 119         md.uses().stream().map(sn -> sn.replace('.', '/')).forEach(mv::visitUse);
 120 
 121         // provides
 122         for (ModuleDescriptor.Provides p : md.provides()) {
 123             mv.visitProvide(p.service().replace('.', '/'),
 124                             p.providers()
 125                                 .stream()
 126                                 .map(pn -> pn.replace('.', '/'))
 127                                 .toArray(String[]::new));
 128         }
 129 
 130         // add the ModulePackages attribute when there are packages that aren't
 131         // exported or open
 132         Stream<String> exported = md.exports().stream()
 133                 .map(ModuleDescriptor.Exports::source);
 134         Stream<String> open = md.opens().stream()
 135                 .map(ModuleDescriptor.Opens::source);
 136         long exportedOrOpen = Stream.concat(exported, open).distinct().count();
 137         if (md.packages().size() > exportedOrOpen) {
 138             md.packages().stream()
 139                     .map(pn -> pn.replace('.', '/'))
 140                     .forEach(mv::visitPackage);
 141         }
 142 
 143         // ModuleMainClass attribute
 144         md.mainClass()
 145             .map(mc -> mc.replace('.', '/'))
 146             .ifPresent(mv::visitMainClass);
 147 
 148         mv.visitEnd();
 149 
 150         // write ModuleTarget attribute if there is a target platform
 151         if (target != null && target.targetPlatform().length() > 0) {
 152             cw.visitAttribute(new ModuleTargetAttribute(target.targetPlatform()));
 153         }
 154 
 155         cw.visitEnd();
 156         return cw.toByteArray();
 157     }
 158 
 159     /**
 160      * Writes a module descriptor to the given output stream as a
 161      * module-info.class.
 162      */
 163     public static void write(ModuleDescriptor descriptor,
 164                              ModuleTarget target,
 165                              OutputStream out)
 166         throws IOException
 167     {
 168         byte[] bytes = toModuleInfo(descriptor, target);
 169         out.write(bytes);
 170     }
 171 
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