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 /* 25 * @test 26 * @bug 8033735 27 * @summary check backtrace field introspection 28 * @modules java.base/jdk.internal.misc 29 * @run main ThrowableIntrospectionSegfault 30 */ 31 32 import java.lang.reflect.*; 33 34 public class ThrowableIntrospectionSegfault { 35 public static void main(java.lang.String[] unused) { 36 // Construct a throwable object. 37 Throwable throwable = new Throwable(); 38 throwable.fillInStackTrace(); 39 40 // Retrieve a reflection handle to the private backtrace field. 41 Class class1 = throwable.getClass(); 42 Field field; 43 try { 44 field = class1.getDeclaredField("backtrace"); 45 } 46 catch (NoSuchFieldException e) { 47 System.err.println("Can't retrieve field handle Throwable.backtrace: " + e.toString()); 48 return; 49 } 50 field.setAccessible(true); 51 52 // Retrieve the value of the backtrace field. 53 Object backtrace; 54 try { 55 backtrace = field.get(throwable); 56 } 57 catch (IllegalAccessException e) { 58 System.err.println( "Can't retrieve field value for Throwable.backtrace: " + e.toString()); 59 return; 60 } 61 62 try { 63 64 // Retrieve the class of throwable.backtrace[0][0]. 65 Class class2 = ((Object[]) ((Object[]) backtrace)[2])[0].getClass(); 66 67 // Segfault occurs while executing this line, to retrieve the name of 68 // this class. 69 String class2Name = class2.getName(); 70 71 System.err.println("class2Name=" + class2Name); 72 return; // pass! Passes if it doesn't crash. 73 } catch (ClassCastException e) { 74 // Passes if it doesn't crash. Also if the backtrace changes this test might get 75 // ClassCastException and that's ok too. 76 System.out.println("Catch exception " + e); 77 return; // pass! Passes if it doesn't crash. 78 } 79 } 80 }