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 Stress defining hidden classes.
  27  * @requires !vm.graal.enabled
  28  * @library /test/lib
  29  * @modules jdk.compiler
  30  * @run main/othervm StressHiddenClasses
  31  */
  32 
  33 import java.lang.invoke.MethodType;
  34 import java.lang.invoke.MethodHandles;
  35 import java.lang.invoke.MethodHandles.Lookup;
  36 import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
  37 import jdk.test.lib.compiler.InMemoryJavaCompiler;
  38 
  39 // This test is based on vmTestbase/vm/mlvm/anonloader/share/StressClassLoadingTest.java
  40 public class StressHiddenClasses {
  41 
  42     private static final int PARSE_TIMEOUT = 0;
  43     private static final int ITERATIONS = 40000;
  44 
  45     static byte klassbuf[] = InMemoryJavaCompiler.compile("TestClass",
  46         "public class TestClass { " +
  47         "    public static void concat(String one, String two) throws Throwable { " +
  48         "        System.out.println(one + two);" +
  49         " } } ");
  50 
  51 
  52     public void run() throws Exception {
  53         for (int x = 0; x < ITERATIONS; x++) {
  54             Thread parserThread  = new Thread() {
  55                 public void run() {
  56                     try {
  57                         Lookup lookup = MethodHandles.lookup();
  58                         Class<?> c = lookup.defineHiddenClass(klassbuf, true, NESTMATE).lookupClass();
  59                     } catch (Throwable e) {
  60                         throw new RuntimeException("Unexpected exception: " + e.toString());
  61                     }
  62                 }
  63             };
  64 
  65             parserThread.start();
  66             parserThread.join(PARSE_TIMEOUT);
  67 
  68             if (parserThread.isAlive()) {
  69                 System.out.println("parser thread may be hung!");
  70                 StackTraceElement[] stack = parserThread.getStackTrace();
  71                 System.out.println("parser thread stack len: " + stack.length);
  72                 System.out.println(parserThread + " stack trace:");
  73                 for (int i = 0; i < stack.length; ++i) {
  74                     System.out.println(parserThread + "\tat " + stack[i]);
  75                 }
  76 
  77                 parserThread.join(); // Wait until either thread finishes or test times out.
  78             }
  79         }
  80     }
  81 
  82 
  83     public static void main(String[] args) throws Throwable {
  84         StressHiddenClasses shc = new StressHiddenClasses();
  85         shc.run();
  86     }
  87 }