/* * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ import java.io.File; import java.lang.ref.Reference; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.concurrent.TimeUnit; import jdk.test.lib.Asserts; import jdk.test.lib.JDKToolLauncher; import jdk.test.lib.apps.LingeredApp; import jdk.test.lib.process.ProcessTools; import jdk.test.lib.hprof.model.JavaClass; import jdk.test.lib.hprof.model.JavaHeapObject; import jdk.test.lib.hprof.model.JavaObject; import jdk.test.lib.hprof.model.JavaThing; import jdk.test.lib.hprof.model.Snapshot; import jdk.test.lib.hprof.parser.Reader; /* * @test * @bug 8317692 * @summary Verifies heap dump contains all fields of an instance * @library /test/lib * @run driver FieldsInInstanceTest */ class FieldsInInstanceTarg extends LingeredApp { public static void main(String[] args) { B b = new B(); NoFields2 nf = new NoFields2(); NoParentFields npf = new NoParentFields(); OnlyParentFields opf = new OnlyParentFields(); DirectParentNoFields dpnf = new DirectParentNoFields(); LingeredApp.main(args); Reference.reachabilityFence(b); Reference.reachabilityFence(nf); Reference.reachabilityFence(npf); Reference.reachabilityFence(opf); Reference.reachabilityFence(dpnf); } interface I { int i = -10; } static abstract class A implements I { static boolean b; int a = 3; String s = "Field"; } static class B extends A { static String f = null; int a = 7; double s = 0.5d; } // no fields: interface I1 { } static class NoFields1 { } static class NoFields2 extends NoFields1 implements I1 { } // no parent fields static class NoParentFields extends NoFields1 implements I1 { int i1 = 1; int i2 = 2; } // only parent fields static class Parent1 { int i3 = 3; } static class OnlyParentFields extends Parent1 { } // in between parent with no fields static class DirectParentNoFields extends OnlyParentFields { int i = 17; } } public class FieldsInInstanceTest { public static void main(String[] args) throws Exception { File dumpFile = new File("Myheapdump.hprof"); createDump(dumpFile, args); verifyDump(dumpFile); } private static void createDump(File dumpFile, String[] extraOptions) throws Exception { LingeredApp theApp = null; try { theApp = new FieldsInInstanceTarg(); List extraVMArgs = new ArrayList<>(); extraVMArgs.addAll(Arrays.asList(extraOptions)); LingeredApp.startApp(theApp, extraVMArgs.toArray(new String[0])); //jcmd GC.heap_dump JDKToolLauncher launcher = JDKToolLauncher .createUsingTestJDK("jcmd") .addToolArg(Long.toString(theApp.getPid())) .addToolArg("GC.heap_dump") .addToolArg(dumpFile.getAbsolutePath()); Process p = ProcessTools.startProcess("jcmd", new ProcessBuilder(launcher.getCommand())); // If something goes wrong with heap dumping most likely we'll get crash of the target VM. while (!p.waitFor(5, TimeUnit.SECONDS)) { if (!theApp.getProcess().isAlive()) { log("ERROR: target VM died, killing jcmd..."); p.destroyForcibly(); throw new Exception("Target VM died"); } } if (p.exitValue() != 0) { throw new Exception("Jcmd exited with code " + p.exitValue()); } } finally { LingeredApp.stopApp(theApp); } } private static void verifyDump(File dumpFile) throws Exception { Asserts.assertTrue(dumpFile.exists(), "Heap dump file not found."); log("Reading " + dumpFile + "..."); try (Snapshot snapshot = Reader.readFile(dumpFile.getPath(), true, 0)) { log("Resolving snapshot..."); snapshot.resolve(true); log("Snapshot resolved."); List bFields = getFields(snapshot, FieldsInInstanceTarg.B.class); // B has 2 instance fields, A has 2 instance fields Asserts.assertEquals(bFields.size(), 4); // JavaObject reverses the order of fields, so fields of B are at the end. // Order is only specified for supertypes, so we check if values are *anywhere* in their range // by using the toString output. String asString = bFields.subList(2, 4).toString(); Asserts.assertTrue(asString.contains("0.5"), "value for field B.s not found"); Asserts.assertTrue(asString.contains("7"), "value for field B.a not found"); asString = bFields.subList(0, 2).toString(); Asserts.assertTrue(asString.contains("3"), "value for field A.a not found"); Asserts.assertTrue(asString.contains("Field"), "value for field A.s not found"); Asserts.assertEquals(getFields(snapshot, FieldsInInstanceTarg.NoFields2.class).size(), 0); Asserts.assertEquals(getFields(snapshot, FieldsInInstanceTarg.NoParentFields.class).size(), 2); Asserts.assertEquals(getFields(snapshot, FieldsInInstanceTarg.OnlyParentFields.class).size(), 1); Asserts.assertEquals(getFields(snapshot, FieldsInInstanceTarg.DirectParentNoFields.class).size(), 2); } } private static List getFields(Snapshot snapshot, Class clazz) { JavaObject javaObject = (JavaObject) snapshot.findClass(clazz.getName()).getInstances(false).nextElement(); List fields = Arrays.asList(javaObject.getFields()); log("Fields for " + clazz + " (including superclasses): " + fields); return fields; } private static void log(Object s) { System.out.println(s); } }