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Implement DDR Command: FindInstances
Related: eclipse-openj9#19267 Signed-off-by: Babneet Singh <[email protected]>
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debugtools/DDR_VM/src/com/ibm/j9ddr/vm29/tools/ddrinteractive/commands/FindInstances.java
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| /* | ||
| * Copyright IBM Corp. and others 2024 | ||
| * | ||
| * This program and the accompanying materials are made available under | ||
| * the terms of the Eclipse Public License 2.0 which accompanies this | ||
| * distribution and is available at https://www.eclipse.org/legal/epl-2.0/ | ||
| * or the Apache License, Version 2.0 which accompanies this distribution and | ||
| * is available at https://www.apache.org/licenses/LICENSE-2.0. | ||
| * | ||
| * This Source Code may also be made available under the following | ||
| * Secondary Licenses when the conditions for such availability set | ||
| * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU | ||
| * General Public License, version 2 with the GNU Classpath | ||
| * Exception [1] and GNU General Public License, version 2 with the | ||
| * OpenJDK Assembly Exception [2]. | ||
| * | ||
| * [1] https://www.gnu.org/software/classpath/license.html | ||
| * [2] https://openjdk.org/legal/assembly-exception.html | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0 | ||
| */ | ||
| package com.ibm.j9ddr.vm29.tools.ddrinteractive.commands; | ||
|
|
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| import java.io.PrintStream; | ||
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|
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| import com.ibm.j9ddr.CorruptDataException; | ||
| import com.ibm.j9ddr.tools.ddrinteractive.Command; | ||
| import com.ibm.j9ddr.tools.ddrinteractive.CommandUtils; | ||
| import com.ibm.j9ddr.tools.ddrinteractive.Context; | ||
| import com.ibm.j9ddr.tools.ddrinteractive.DDRInteractiveCommandException; | ||
| import com.ibm.j9ddr.tools.ddrinteractive.Table; | ||
| import com.ibm.j9ddr.vm29.pointer.generated.J9ClassPointer; | ||
| import com.ibm.j9ddr.vm29.pointer.generated.J9ObjectPointer; | ||
| import com.ibm.j9ddr.vm29.pointer.helper.J9ClassHelper; | ||
| import com.ibm.j9ddr.vm29.pointer.helper.J9ObjectHelper; | ||
|
|
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| import com.ibm.j9ddr.vm29.j9.DataType; | ||
| import com.ibm.j9ddr.vm29.j9.walkers.ClassSegmentIterator; | ||
| import com.ibm.j9ddr.vm29.pointer.generated.J9ClassPointer; | ||
| import com.ibm.j9ddr.vm29.pointer.generated.J9JavaVMPointer; | ||
| import com.ibm.j9ddr.vm29.pointer.helper.J9RASHelper; | ||
|
|
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| import com.ibm.j9ddr.vm29.j9.gc.GCHeapRegionDescriptor; | ||
| import com.ibm.j9ddr.vm29.j9.gc.GCHeapRegionIterator; | ||
| import com.ibm.j9ddr.vm29.j9.gc.GCObjectHeapIterator; | ||
|
|
||
| public class FindInstances extends Command | ||
| { | ||
| private String className; | ||
| private J9ClassPointer classPointer; | ||
| private Table data; | ||
| private long corruptCount; | ||
| private long objectsFound; | ||
|
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| public FindInstances() { | ||
| addCommand("findinstances", "<classname>", "find all instances of the specific class and its subclasses"); | ||
| } | ||
|
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| private static void printUsage (PrintStream out) { | ||
| out.println("findinstances <name> - find all instances of the specific class and its subclasses"); | ||
| } | ||
|
|
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| private boolean parseArgs(PrintStream out, String[] args) throws DDRInteractiveCommandException { | ||
| if (args.length != 1) { | ||
| out.println("Exactly one argument expected"); | ||
| return false; | ||
| } | ||
| String firstArg = args[0]; | ||
| if (firstArg.equals("help")) { | ||
| printUsage(out); | ||
| return false; | ||
| } | ||
| className = firstArg; | ||
| return true; | ||
| } | ||
|
|
||
| @Override | ||
| public void run(String command, String[] args, Context context, PrintStream out) throws DDRInteractiveCommandException { | ||
| if (args != null) { | ||
| if (!parseArgs(out, args)) { | ||
| return; | ||
| } | ||
| } | ||
|
|
||
| try { | ||
| J9JavaVMPointer vm = J9RASHelper.getVM(DataType.getJ9RASPointer()); | ||
| ClassSegmentIterator iterator = new ClassSegmentIterator(vm.classMemorySegments()); | ||
|
|
||
| out.format( | ||
| "Searching for class named '%s' in VM=%s%n", | ||
| className, Long.toHexString(vm.getAddress())); | ||
|
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| /* Reset classPointer for each invocation of the command. */ | ||
| classPointer = null; | ||
|
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| while (iterator.hasNext()) { | ||
| J9ClassPointer clsPointer = (J9ClassPointer)iterator.next(); | ||
| String javaName = J9ClassHelper.getJavaName(clsPointer); | ||
| if (className.equals(javaName)) { | ||
| String hexString = clsPointer.getHexAddress(); | ||
| classPointer = clsPointer; | ||
| out.format("Found !j9class %s named %s%n", hexString, javaName); | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| if (classPointer == null) { | ||
| out.format("No class named %s found%n", className); | ||
| return; | ||
| } | ||
| } catch (CorruptDataException e) { | ||
| throw new DDRInteractiveCommandException(e); | ||
| } | ||
|
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| /* Allocate a new instance of Table for each invocation of the command. */ | ||
| data = new Table("Instances of " + className); | ||
| data.row("Address", "Class Name"); | ||
|
|
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| /* Reset counts for each invocation of the command. */ | ||
| corruptCount = 0; | ||
| objectsFound = 0; | ||
|
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| scanHeap(); | ||
|
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| out.format("Objects found: %d%n", objectsFound); | ||
| out.format("Corruptions encountered: %d%n", corruptCount); | ||
|
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| data.render(out); | ||
| } | ||
|
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| private void scanHeap() { | ||
| try { | ||
| GCHeapRegionIterator regions = GCHeapRegionIterator.from(); | ||
| while (regions.hasNext()) { | ||
| GCHeapRegionDescriptor region = regions.next(); | ||
| scanObjects(region); | ||
| } | ||
| } catch (CorruptDataException e) { | ||
| e.printStackTrace(); | ||
| } | ||
|
|
||
| } | ||
|
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| private void scanObjects(GCHeapRegionDescriptor region) throws CorruptDataException { | ||
| GCObjectHeapIterator heapIterator = GCObjectHeapIterator.fromHeapRegionDescriptor(region, true, true); | ||
| while (heapIterator.hasNext()) { | ||
| J9ObjectPointer object = heapIterator.next(); | ||
| try { | ||
| J9ClassPointer objClass = J9ObjectHelper.clazz(object); | ||
| if (objClass.notNull() && J9ClassHelper.isSameOrSuperClassOf(classPointer, objClass)) { | ||
| data.row(object.getHexAddress(), J9ClassHelper.getJavaName(objClass)); | ||
| objectsFound += 1; | ||
| } | ||
| } catch (CorruptDataException e) { | ||
| corruptCount += 1; | ||
| } | ||
| } | ||
| } | ||
| } |