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190
test/hotspot/jtreg/serviceability/HeapDump/FieldsInInstanceTest.java
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| /* | ||
| * 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; | ||
| } | ||
| } | ||
|
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| public class FieldsInInstanceTest { | ||
|
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| public static void main(String[] args) throws Exception { | ||
| File dumpFile = new File("Myheapdump.hprof"); | ||
| createDump(dumpFile, args); | ||
| verifyDump(dumpFile); | ||
| } | ||
|
|
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| private static void createDump(File dumpFile, String[] extraOptions) throws Exception { | ||
| LingeredApp theApp = null; | ||
| try { | ||
| theApp = new FieldsInInstanceTarg(); | ||
|
|
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| List<String> extraVMArgs = new ArrayList<>(); | ||
| extraVMArgs.addAll(Arrays.asList(extraOptions)); | ||
| LingeredApp.startApp(theApp, extraVMArgs.toArray(new String[0])); | ||
|
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| //jcmd <pid> GC.heap_dump <file_path> | ||
| 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); | ||
| } | ||
| } | ||
|
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| private static void verifyDump(File dumpFile) throws Exception { | ||
| Asserts.assertTrue(dumpFile.exists(), "Heap dump file not found."); | ||
|
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| log("Reading " + dumpFile + "..."); | ||
| try (Snapshot snapshot = Reader.readFile(dumpFile.getPath(), true, 0)) { | ||
| log("Resolving snapshot..."); | ||
| snapshot.resolve(true); | ||
| log("Snapshot resolved."); | ||
|
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| List<JavaThing> 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"); | ||
|
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| Asserts.assertEquals(getFields(snapshot, FieldsInInstanceTarg.NoFields2.class).size(), 0); | ||
|
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| Asserts.assertEquals(getFields(snapshot, FieldsInInstanceTarg.NoParentFields.class).size(), 2); | ||
|
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| Asserts.assertEquals(getFields(snapshot, FieldsInInstanceTarg.OnlyParentFields.class).size(), 1); | ||
|
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| Asserts.assertEquals(getFields(snapshot, FieldsInInstanceTarg.DirectParentNoFields.class).size(), 2); | ||
| } | ||
| } | ||
|
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| private static List<JavaThing> getFields(Snapshot snapshot, Class<?> clazz) { | ||
| JavaObject javaObject = (JavaObject) snapshot.findClass(clazz.getName()).getInstances(false).nextElement(); | ||
| List<JavaThing> fields = Arrays.asList(javaObject.getFields()); | ||
| log("Fields for " + clazz + " (including superclasses): " + fields); | ||
| return fields; | ||
| } | ||
|
|
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| private static void log(Object s) { | ||
| System.out.println(s); | ||
| } | ||
|
|
||
| } |
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