1 /*
   2  * Copyright (c) 2019, 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 /*
  25  * @test
  26  * @modules java.base/jdk.internal.misc
  27  * @library /test/lib
  28  * @build jdk.test.lib.JDKToolLauncher
  29  *        jdk.test.lib.process.ProcessTools
  30  *        jdk.test.lib.Utils
  31  * @run main/othervm -Xverify:remote DefineHiddenClass
  32  */
  33 
  34 import java.io.ByteArrayOutputStream;
  35 import java.io.File;
  36 import java.io.FileInputStream;
  37 import java.lang.invoke.MethodHandles;
  38 import java.lang.invoke.MethodHandles.Lookup;
  39 import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
  40 import java.nio.file.Path;
  41 import java.nio.file.Paths;
  42 import jdk.internal.misc.Unsafe;
  43 
  44 import jdk.test.lib.JDKToolLauncher;
  45 import jdk.test.lib.process.ProcessTools;
  46 import jdk.test.lib.Utils;
  47 
  48 /* package-private */ interface Test {
  49   void test();
  50 }
  51 
  52 
  53 public class DefineHiddenClass {
  54 
  55     static final Class<?> klass = DefineHiddenClass.class;
  56     static final Path SRC_DIR = Paths.get(Utils.TEST_SRC, "hidden");
  57     static final Path CLASSES_DIR = Paths.get(Utils.TEST_CLASSES, "hidden");
  58 
  59     static void compileSources(String sourceFile) throws Throwable {
  60         JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("javac");
  61         launcher.addToolArg("-cp")
  62                 .addToolArg(Utils.TEST_CLASSES.toString())
  63                 .addToolArg("-d")
  64                 .addToolArg(CLASSES_DIR.toString())
  65             .addToolArg(Paths.get(SRC_DIR.toString(), sourceFile).toString());
  66 
  67         int exitCode = ProcessTools.executeCommand(launcher.getCommand())
  68                                    .getExitValue();
  69         if (exitCode != 0) {
  70             throw new RuntimeException("Compilation of the test failed. "
  71                     + "Unexpected exit code: " + exitCode);
  72         }
  73     }
  74 
  75     static byte[] readClassFile(String classFileName) throws Exception {
  76         File classFile = new File(CLASSES_DIR + File.separator + classFileName);
  77         try (FileInputStream in = new FileInputStream(classFile);
  78              ByteArrayOutputStream out = new ByteArrayOutputStream())
  79         {
  80             int b;
  81             while ((b = in.read()) != -1) {
  82                 out.write(b);
  83             }
  84             return out.toByteArray();
  85         }
  86     }
  87 
  88     public static void main(String[] args) throws Throwable {
  89         compileSources("NameInString.java");
  90         Lookup lookup = MethodHandles.lookup();
  91         byte[] bytes = readClassFile("NameInString.class");
  92         Class<?> c = lookup.defineHiddenClass(bytes, true, NESTMATE).lookupClass();
  93         Test t = (Test) c.newInstance();
  94         t.test();
  95     }
  96 
  97 }