1 /* 2 * Copyright (c) 2017, 2019, 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 & !vm.graal.enabled 29 * @compile TestHeapDump.java 30 * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive TestHeapDump 31 * 32 */ 33 34 /** 35 * @test TestHeapDump 36 * @summary Tests JVMTI heap dumps 37 * @key gc 38 * @requires vm.gc.Shenandoah & !vm.graal.enabled & (vm.bits == "64") 39 * @compile TestHeapDump.java 40 * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive -XX:-UseCompressedOops TestHeapDump 41 */ 42 43 import java.lang.ref.Reference; 44 45 public class TestHeapDump { 46 47 private static final int NUM_ITER = 10000; 48 49 private static final int ARRAY_SIZE = 1000; 50 51 private static final int EXPECTED_OBJECTS = 52 ARRAY_SIZE + // array reachable from instance field 53 1 + // static field root 54 1; // local field root 55 56 static { 57 try { 58 System.loadLibrary("TestHeapDump"); 59 } catch (UnsatisfiedLinkError ule) { 60 System.err.println("Could not load TestHeapDump library"); 61 System.err.println("java.library.path: " 62 + System.getProperty("java.library.path")); 63 throw ule; 64 } 65 } 66 67 native static int heapdump(Class<?> filterClass); 68 69 public static void main(String args[]) { 70 new TestHeapDump().run(); 71 } 72 73 // This root needs to be discovered 74 static Object root = new TestObject(); 75 76 // This field needs to be discovered 77 TestObject[] array; 78 79 public void run() { 80 array = new TestObject[ARRAY_SIZE]; 81 for (int i = 0; i < ARRAY_SIZE; i++) { 82 array[i] = new TestObject(); 83 } 84 TestObject localRoot = new TestObject(); 85 for (int i = 0; i < NUM_ITER; i++) { 86 int numObjs = heapdump(TestObject.class); 87 if (numObjs != EXPECTED_OBJECTS) { 88 throw new RuntimeException("Expected " + EXPECTED_OBJECTS + " objects, but got " + numObjs); 89 } 90 } 91 Reference.reachabilityFence(array); 92 Reference.reachabilityFence(localRoot); 93 } 94 95 // We look for the instances of this class during the heap scan 96 public static class TestObject {} 97 }