1 /*
   2  * Copyright (c) 2020, 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  * @summary Creates a hidden class inside of a hidden class.
  27  * @library /test/lib
  28  * @modules jdk.compiler
  29  * @run main p.NestedHidden
  30  */
  31 
  32 package p;
  33 
  34 import java.lang.*;
  35 
  36 import java.lang.invoke.MethodHandles;
  37 import java.lang.invoke.MethodHandles.Lookup;
  38 import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
  39 import jdk.test.lib.compiler.InMemoryJavaCompiler;
  40 
  41 
  42 // Test that a hidden class can define its own hidden class by calling
  43 // lookup.defineHiddenClass().
  44 public class NestedHidden {
  45     static byte klassbuf[] = InMemoryJavaCompiler.compile("p.TestClass",
  46         "package p; " +
  47         "public class TestClass { " +
  48         "    public static void concat(String one, String two) throws Throwable { " +
  49         "        System.out.println(one + two);" +
  50         " } } ");
  51 
  52     public static void main(String args[]) throws Exception {
  53         // The hidden class calls lookup.defineHiddenClass(), creating a nested hidden class.
  54         byte klassbuf2[] = InMemoryJavaCompiler.compile("p.TestClass2",
  55             "package p; " +
  56             "import java.lang.invoke.MethodHandles; " +
  57             "import java.lang.invoke.MethodHandles.Lookup; " +
  58             "import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*; " +
  59             "public class TestClass2 { " +
  60             "    public static void doit() throws Throwable { " +
  61             "        Lookup lookup = MethodHandles.lookup(); " +
  62             "        Class<?> klass2 = lookup.defineHiddenClass(p.NestedHidden.klassbuf, true, NESTMATE).lookupClass(); " +
  63             "        Class[] dArgs = new Class[2]; " +
  64             "        dArgs[0] = String.class; " +
  65             "        dArgs[1] = String.class; " +
  66             "        try { " +
  67             "            klass2.getMethod(\"concat\", dArgs).invoke(null, \"CC\", \"DD\"); " +
  68             "        } catch (Throwable ex) { " +
  69             "            throw new RuntimeException(\"Exception: \" + ex.toString()); " +
  70             "        } " +
  71             "} } ");
  72 
  73         Lookup lookup = MethodHandles.lookup();
  74         Class<?> klass2 = lookup.defineHiddenClass(klassbuf2, true, NESTMATE).lookupClass();
  75         klass2.getMethod("doit").invoke(null);
  76     }
  77 }