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.net.URI;
  30 import java.nio.file.FileSystem;
  31 import java.nio.file.FileSystems;
  32 import java.nio.file.Files;
  33 import java.nio.file.Path;
  34 import java.util.Collections;
  35 import java.util.Set;
  36 
  37 import jdk.internal.module.ClassFileAttributes;
  38 import jdk.internal.module.ClassFileAttributes.ModuleTargetAttribute;
  39 import jdk.internal.module.ClassFileConstants;
  40 import jdk.internal.org.objectweb.asm.Attribute;
  41 import jdk.internal.org.objectweb.asm.ClassReader;
  42 import jdk.internal.org.objectweb.asm.ClassVisitor;
  43 import jdk.internal.org.objectweb.asm.Opcodes;
  44 
  45 public class Main {
  46     private static boolean hasModuleTarget(InputStream in) throws IOException {
  47         ModuleTargetAttribute[] modTargets = new ModuleTargetAttribute[1];
  48         ClassVisitor cv = new ClassVisitor(Opcodes.ASM5) {
  49             @Override
  50             public void visitAttribute(Attribute attr) {
  51                 if (attr instanceof ModuleTargetAttribute) {
  52                     modTargets[0] = (ModuleTargetAttribute)attr;
  53                 }
  54             }
  55         };
  56 
  57         // prototype of attributes that should be parsed
  58         Attribute[] attrs = new Attribute[] {
  59             new ModuleTargetAttribute()
  60         };
  61 
  62         // parse module-info.class
  63         ClassReader cr = new ClassReader(in);
  64         cr.accept(cv, attrs, 0);
  65         return modTargets[0] != null && modTargets[0].targetPlatform() != null;
  66     }
  67 
  68     public static void main(String... args) throws Exception {
  69         // load another package
  70         p2.T.test();
  71 
  72         // validate the module descriptor
  73         validate(Main.class.getModule());
  74 
  75         // validate the Moduletarget attribute for java.base
  76         FileSystem fs = FileSystems.newFileSystem(URI.create("jrt:/"),
  77                                                   Collections.emptyMap());
  78         Path path = fs.getPath("/", "modules", "java.base", "module-info.class");
  79         try (InputStream in = Files.newInputStream(path)) {
  80             if (! hasModuleTarget(in)) {
  81                 throw new RuntimeException("Missing ModuleTarget for java.base");
  82             }
  83         }
  84     }
  85 
  86     static void validate(Module module) throws IOException {
  87         ModuleDescriptor md = module.getDescriptor();
  88 
  89         // read m1/module-info.class
  90         FileSystem fs = FileSystems.newFileSystem(URI.create("jrt:/"),
  91                                                   Collections.emptyMap());
  92         Path path = fs.getPath("/", "modules", module.getName(), "module-info.class");
  93         ModuleDescriptor md1 = ModuleDescriptor.read(Files.newInputStream(path));
  94 
  95 
  96         // check the module descriptor of a system module and read from jimage
  97         checkPackages(md.packages(), "p1", "p2");
  98         checkPackages(md1.packages(), "p1", "p2");
  99 
 100         try (InputStream in = Files.newInputStream(path)) {
 101             checkModuleTargetAttribute(in, "p1");
 102         }
 103     }
 104 
 105     static void checkPackages(Set<String> pkgs, String... expected) {
 106         if (!pkgs.equals(Set.of(expected))) {
 107             throw new RuntimeException(pkgs + " expected: " + Set.of(expected));
 108         }
 109     }
 110 
 111     static void checkModuleTargetAttribute(InputStream in, String modName) throws IOException {
 112         if (hasModuleTarget(in)) {
 113             throw new RuntimeException("ModuleTarget present for " + modName);
 114         }
 115     }
 116 }