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 package jdk.vm.ci.hotspot.test;
  24 
  25 import java.io.ByteArrayOutputStream;
  26 import java.io.PrintStream;
  27 import java.lang.reflect.InvocationTargetException;
  28 import java.lang.reflect.Method;
  29 
  30 import org.junit.Assert;
  31 import org.junit.Test;
  32 
  33 public class TestTranslatedException {
  34 
  35     private static String printToString(Throwable throwable) {
  36         ByteArrayOutputStream baos = new ByteArrayOutputStream();
  37         try (PrintStream ps = new PrintStream(baos)) {
  38             throwable.printStackTrace(ps);
  39         }
  40         return baos.toString();
  41     }
  42 
  43     @SuppressWarnings("serial")
  44     public static class Untranslatable extends RuntimeException {
  45         public Untranslatable(String message, Throwable cause) {
  46             super(message, cause);
  47         }
  48     }
  49 
  50     @SuppressWarnings("unchecked")
  51     @Test
  52     public void encodeDecodeTest() throws Exception {
  53 
  54         Class<?> translatedExceptionClass = Class.forName("jdk.vm.ci.hotspot.TranslatedException");
  55 
  56         Method encode = translatedExceptionClass.getDeclaredMethod("encodeThrowable", Throwable.class);
  57         Method decode = translatedExceptionClass.getDeclaredMethod("decodeThrowable", String.class);
  58         encode.setAccessible(true);
  59         decode.setAccessible(true);
  60 
  61         Throwable throwable = new ExceptionInInitializerError(new InvocationTargetException(new Untranslatable("test exception", new NullPointerException()), "invoke"));
  62         for (int i = 0; i < 10; i++) {
  63             throwable = new ExceptionInInitializerError(new InvocationTargetException(new RuntimeException(String.valueOf(i), throwable), "invoke"));
  64         }
  65         String before = printToString(throwable);
  66         String encoding = (String) encode.invoke(null, throwable);
  67         Throwable decoded = (Throwable) decode.invoke(null, encoding);
  68         String after = printToString(decoded);
  69 
  70         after = after.replace(
  71                         "jdk.vm.ci.hotspot.TranslatedException: [java.lang.ClassNotFoundException: jdk/vm/ci/hotspot/test/TestTranslatedException$Untranslatable]",
  72                         "jdk.vm.ci.hotspot.test.TestTranslatedException$Untranslatable: test exception");
  73 
  74         Assert.assertEquals("before:\n" + before + "\nafter:\n" + after, before, after);
  75     }
  76 }