1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package p1;
  25 
  26 import java.io.InputStream;
  27 import java.io.IOException;
  28 import java.lang.module.ModuleDescriptor;
  29 import java.lang.reflect.Layer;
  30 import java.lang.reflect.Module;
  31 import java.net.URI;
  32 import java.nio.file.FileSystem;
  33 import java.nio.file.FileSystems;
  34 import java.nio.file.Files;
  35 import java.nio.file.Path;
  36 import java.util.Collections;
  37 import java.util.Set;
  38 
  39 import jdk.internal.module.ClassFileAttributes;
  40 import jdk.internal.module.ClassFileAttributes.ModuleTargetAttribute;
  41 import jdk.internal.module.ClassFileConstants;
  42 import jdk.internal.org.objectweb.asm.Attribute;
  43 import jdk.internal.org.objectweb.asm.ClassReader;
  44 import jdk.internal.org.objectweb.asm.ClassVisitor;
  45 import jdk.internal.org.objectweb.asm.Opcodes;
  46 
  47 public class Main {
  48     private static boolean hasModuleTarget(InputStream in) throws IOException {
  49         ModuleTargetAttribute[] modTargets = new ModuleTargetAttribute[1];
  50         ClassVisitor cv = new ClassVisitor(Opcodes.ASM5) {
  51             @Override
  52             public void visitAttribute(Attribute attr) {
  53                 if (attr instanceof ModuleTargetAttribute) {
  54                     modTargets[0] = (ModuleTargetAttribute)attr;
  55                 }
  56             }
  57         };
  58 
  59         // prototype of attributes that should be parsed
  60         Attribute[] attrs = new Attribute[] {
  61             new ModuleTargetAttribute()
  62         };
  63 
  64         // parse module-info.class
  65         ClassReader cr = new ClassReader(in);
  66         cr.accept(cv, attrs, 0);
  67         return modTargets[0] != null &&
  68             (modTargets[0].osName() != null || modTargets[0].osArch() != null);
  69     }
  70 
  71     public static void main(String... args) throws Exception {
  72         // load another package
  73         p2.T.test();
  74 
  75         // validate the module descriptor
  76         validate(Main.class.getModule());
  77 
  78         // validate the Moduletarget attribute for java.base
  79         FileSystem fs = FileSystems.newFileSystem(URI.create("jrt:/"),
  80                                                   Collections.emptyMap());
  81         Path path = fs.getPath("/", "modules", "java.base", "module-info.class");
  82         try (InputStream in = Files.newInputStream(path)) {
  83             if (! hasModuleTarget(in)) {
  84                 throw new RuntimeException("Missing ModuleTarget for java.base");
  85             }
  86         }
  87     }
  88 
  89     static void validate(Module module) throws IOException {
  90         ModuleDescriptor md = module.getDescriptor();
  91 
  92         // read m1/module-info.class
  93         FileSystem fs = FileSystems.newFileSystem(URI.create("jrt:/"),
  94                                                   Collections.emptyMap());
  95         Path path = fs.getPath("/", "modules", module.getName(), "module-info.class");
  96         ModuleDescriptor md1 = ModuleDescriptor.read(Files.newInputStream(path));
  97 
  98 
  99         // check the module descriptor of a system module and read from jimage
 100         checkPackages(md.packages(), "p1", "p2");
 101         checkPackages(md1.packages(), "p1", "p2");
 102 
 103         try (InputStream in = Files.newInputStream(path)) {
 104             checkModuleTargetAttribute(in, "p1");
 105         }
 106     }
 107 
 108     static void checkPackages(Set<String> pkgs, String... expected) {
 109         if (!pkgs.equals(Set.of(expected))) {
 110             throw new RuntimeException(pkgs + " expected: " + Set.of(expected));
 111         }
 112     }
 113 
 114     static void checkModuleTargetAttribute(InputStream in, String modName) throws IOException {
 115         if (hasModuleTarget(in)) {
 116             throw new RuntimeException("ModuleTarget present for " + modName);
 117         }
 118     }
 119 }