1 /* 2 * Copyright (c) 2018, 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 7179701 27 * @summary MaxJavaStackTraceDepth of zero is not handled correctly/consistently in the VM 28 * @modules java.base/jdk.internal.misc:open 29 * @modules java.base/java.lang:open 30 * @library /test/lib 31 * @run driver TestMaxJavaStackTraceDepth runTest 32 */ 33 34 import java.lang.reflect.Field; 35 import jdk.test.lib.Asserts; 36 import jdk.test.lib.process.OutputAnalyzer; 37 import jdk.test.lib.process.ProcessTools; 38 39 40 public class TestMaxJavaStackTraceDepth { 41 42 static final int maxDepth = 2010; 43 44 // Inner class that throws a lot of exceptions 45 static class Thrower { 46 int count = 0; 47 48 int getDepth(Throwable t) throws Exception { 49 Field f = Throwable.class.getDeclaredField("depth"); 50 f.setAccessible(true); // it's private 51 return f.getInt(t); 52 } 53 54 void callThrow() throws Exception { 55 if (++count < maxDepth) { 56 callThrow(); 57 } else { 58 throw new RuntimeException("depth tested " + maxDepth); 59 } 60 } 61 62 void testThrow() throws Exception { 63 try { 64 count = getDepth(new Throwable()); // count stack to this point. 65 callThrow(); 66 } catch(Exception e) { 67 e.getStackTrace(); 68 System.out.println(e.getMessage()); 69 int throwableDepth = getDepth(e); 70 System.out.println("java.lang.RuntimeException, " + throwableDepth); 71 } 72 } 73 } 74 75 public static void main(String args[]) throws Exception { 76 if (args.length > 0) { 77 // Test values of MaxJavaStackTraceDepth 78 int[] depths = {0, 20, 1024}; 79 for (int d : depths) { 80 System.out.println("running test with -XX:MaxJavaStackTraceDepth=" + d); 81 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xlog:stacktrace=info", 82 "-XX:MaxJavaStackTraceDepth=" + d, 83 "--add-opens", 84 "java.base/java.lang=ALL-UNNAMED", 85 "TestMaxJavaStackTraceDepth"); 86 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 87 if (d == 0) { 88 // Should get all the elements in stack trace 89 output.shouldContain("java.lang.RuntimeException, " + maxDepth); 90 } else { 91 output.shouldContain("java.lang.RuntimeException, " + d); 92 } 93 output.shouldHaveExitValue(0); 94 } 95 } else { 96 // run the test 97 Thrower t = new Thrower(); 98 t.testThrow(); 99 } 100 } 101 }