1 /* 2 * Copyright (c) 2018, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.jfr.jvm; 27 28 import jdk.jfr.FlightRecorder; 29 import jdk.jfr.internal.JVM; 30 import jdk.testlibrary.Asserts; 31 32 /* 33 * @test TestGetStackTraceId 34 * @key jfr 35 * @library /lib/testlibrary 36 * @modules jdk.jfr/jdk.jfr.internal 37 * @run main/othervm jdk.jfr.jvm.TestGetStackTraceId 38 */ 39 public class TestGetStackTraceId { 40 41 public static void main(String... args) { 42 FlightRecorder.getFlightRecorder(); 43 JVM jvm = JVM.getJVM(); 44 45 long id10 = getStackIdOfDepth(10); 46 assertValid(id10); 47 48 long id5 = getStackIdOfDepth(5); 49 assertValid(id5); 50 51 Asserts.assertNotEquals(id5, id10, "Different stack depth must return different stack trace ids"); 52 53 assertMaxSkip(jvm); 54 } 55 56 private static void assertMaxSkip(JVM jvm) { 57 assertValid(jvm.getStackTraceId(Integer.MAX_VALUE)); 58 } 59 60 private static void assertValid(long value) { 61 Asserts.assertGreaterThan(value, 0L, "Stack trace id must be greater than 0, was " + value); 62 } 63 64 public static long getStackIdOfDepth(int depth) { 65 if (depth > 0) { 66 return getStackIdOfDepth(depth - 1); 67 } 68 return JVM.getJVM().getStackTraceId(0); 69 } 70 }