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.  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.test.lib.Asserts;
  31 
  32 /**
  33  * @test TestGetStackTraceId
  34  * @key jfr
  35  *
  36  * @library /lib /
  37  *
  38  * @run main/othervm jdk.jfr.jvm.TestGetStackTraceId
  39  */
  40 public class TestGetStackTraceId {
  41 
  42     public static void main(String... args) {
  43         FlightRecorder.getFlightRecorder();
  44         JVM jvm = JVM.getJVM();
  45 
  46         long id10 = getStackIdOfDepth(10);
  47         assertValid(id10);
  48 
  49         long id5 = getStackIdOfDepth(5);
  50         assertValid(id5);
  51 
  52         Asserts.assertNotEquals(id5, id10, "Different stack depth must return different stack trace ids");
  53 
  54         assertMaxSkip(jvm);
  55     }
  56 
  57     private static void assertMaxSkip(JVM jvm) {
  58         assertValid(jvm.getStackTraceId(Integer.MAX_VALUE));
  59     }
  60 
  61     private static void assertValid(long value) {
  62         Asserts.assertGreaterThan(value, 0L, "Stack trace id must be greater than 0, was " + value);
  63     }
  64 
  65     public static long getStackIdOfDepth(int depth) {
  66         if (depth > 0) {
  67             return getStackIdOfDepth(depth - 1);
  68         }
  69         return JVM.getJVM().getStackTraceId(0);
  70     }
  71 }