1 /* 2 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 /** 25 * @test TestHeapDump 26 * @summary Tests JVMTI heap dumps 27 * @key gc 28 * @requires vm.gc.Shenandoah 29 * @compile TestHeapDump.java 30 * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive -XX:+UseCompressedOops TestHeapDump 31 * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive -XX:-UseCompressedOops TestHeapDump 32 */ 33 34 public class TestHeapDump { 35 36 private static final int NUM_ITER = 10000; 37 38 private static final int ARRAY_SIZE = 1000; 39 40 private static final int EXPECTED_OBJECTS = 41 ARRAY_SIZE + // array reachable from instance field 42 1 + // static field root 43 1; // local field root 44 45 static { 46 try { 47 System.loadLibrary("TestHeapDump"); 48 } catch (UnsatisfiedLinkError ule) { 49 System.err.println("Could not load TestHeapDump library"); 50 System.err.println("java.library.path: " 51 + System.getProperty("java.library.path")); 52 throw ule; 53 } 54 } 55 56 native static int heapdump(Class<?> filterClass); 57 58 public static void main(String args[]) { 59 new TestHeapDump().run(); 60 } 61 62 // This root needs to be discovered 63 static Object root = new TestObject(); 64 65 // This field needs to be discovered 66 TestObject[] array; 67 68 public void run() { 69 array = new TestObject[ARRAY_SIZE]; 70 for (int i = 0; i < ARRAY_SIZE; i++) { 71 array[i] = new TestObject(); 72 } 73 TestObject localRoot = new TestObject(); 74 for (int i = 0; i < NUM_ITER; i++) { 75 int numObjs = heapdump(TestObject.class); 76 if (numObjs != EXPECTED_OBJECTS) { 77 throw new RuntimeException("Expected " + EXPECTED_OBJECTS + " objects, but got " + numObjs); 78 } 79 } 80 } 81 82 // We look for the instances of this class during the heap scan 83 public static class TestObject {} 84 }