1 /* 2 * Copyright (c) 2017, 2020, Red Hat, Inc. 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 /** 26 * @test TestHeapDump 27 * @summary Tests JVMTI heap dumps 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 TestHeapDump 31 * 32 */ 33 34 /** 35 * @test TestHeapDump 36 * @summary Tests JVMTI heap dumps 37 * @requires vm.gc.Shenandoah 38 * @requires 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 /** 44 * @test TestHeapDump 45 * @summary Tests JVMTI heap dumps 46 * @requires vm.gc.Shenandoah 47 * @compile TestHeapDump.java 48 * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive -XX:+UseStringDeduplication TestHeapDump 49 */ 50 51 import java.lang.ref.Reference; 52 53 public class TestHeapDump { 54 55 private static final int NUM_ITER = 10000; 56 57 private static final int ARRAY_SIZE = 1000; 58 59 private static final int EXPECTED_OBJECTS = 60 ARRAY_SIZE + // array reachable from instance field 61 1 + // static field root 62 1; // local field root 63 64 static { 65 try { 66 System.loadLibrary("TestHeapDump"); 67 } catch (UnsatisfiedLinkError ule) { 68 System.err.println("Could not load TestHeapDump library"); 69 System.err.println("java.library.path: " 70 + System.getProperty("java.library.path")); 71 throw ule; 72 } 73 } 74 75 native static int heapdump(Class<?> filterClass); 76 77 public static void main(String args[]) { 78 new TestHeapDump().run(); 79 } 80 81 // This root needs to be discovered 82 static Object root = new TestObject(); 83 84 // This field needs to be discovered 85 TestObject[] array; 86 87 public void run() { 88 array = new TestObject[ARRAY_SIZE]; 89 for (int i = 0; i < ARRAY_SIZE; i++) { 90 array[i] = new TestObject(); 91 } 92 TestObject localRoot = new TestObject(); 93 for (int i = 0; i < NUM_ITER; i++) { 94 int numObjs = heapdump(TestObject.class); 95 if (numObjs != EXPECTED_OBJECTS) { 96 throw new RuntimeException("Expected " + EXPECTED_OBJECTS + " objects, but got " + numObjs); 97 } 98 } 99 Reference.reachabilityFence(array); 100 Reference.reachabilityFence(localRoot); 101 } 102 103 // We look for the instances of this class during the heap scan 104 public static class TestObject {} 105 }