| /* |
| * Copyright (c) 2000, 2013, 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. |
| * |
| */ |
| |
| package sun.jvm.hotspot.oops; |
| |
| import java.io.*; |
| import java.util.*; |
| import sun.jvm.hotspot.utilities.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| |
| // Oop represents the superclass for all types of |
| // objects in the HotSpot object heap. |
| |
| public class Oop { |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { |
| Type type = db.lookupType("oopDesc"); |
| mark = new CIntField(type.getCIntegerField("_mark"), 0); |
| klass = new MetadataField(type.getAddressField("_metadata._klass"), 0); |
| compressedKlass = new NarrowKlassField(type.getAddressField("_metadata._compressed_klass"), 0); |
| headerSize = type.getSize(); |
| } |
| |
| private OopHandle handle; |
| private ObjectHeap heap; |
| |
| Oop(OopHandle handle, ObjectHeap heap) { |
| this.handle = handle; |
| this.heap = heap; |
| } |
| |
| ObjectHeap getHeap() { return heap; } |
| |
| /** Should not be used or needed by most clients outside this |
| package; is needed, however, by {@link |
| sun.jvm.hotspot.utilities.MarkBits}. */ |
| public OopHandle getHandle() { return handle; } |
| |
| private static long headerSize; |
| public static long getHeaderSize() { return headerSize; } // Header size in bytes. |
| |
| private static CIntField mark; |
| private static MetadataField klass; |
| private static NarrowKlassField compressedKlass; |
| |
| // Accessors for declared fields |
| public Mark getMark() { return new Mark(getHandle()); } |
| public Klass getKlass() { |
| if (VM.getVM().isCompressedKlassPointersEnabled()) { |
| return (Klass)compressedKlass.getValue(getHandle()); |
| } else { |
| return (Klass)klass.getValue(getHandle()); |
| } |
| } |
| |
| public boolean isA(Klass k) { |
| return getKlass().isSubtypeOf(k); |
| } |
| |
| // Returns the byte size of this object |
| public long getObjectSize() { |
| Klass k = getKlass(); |
| // All other types should be overriding getObjectSize directly |
| return ((InstanceKlass)k).getObjectSize(this); |
| } |
| |
| // Type test operations |
| public boolean isInstance() { return false; } |
| public boolean isInstanceRef() { return false; } |
| public boolean isArray() { return false; } |
| public boolean isObjArray() { return false; } |
| public boolean isTypeArray() { return false; } |
| public boolean isThread() { return false; } |
| |
| // Align the object size. |
| public static long alignObjectSize(long size) { |
| return VM.getVM().alignUp(size, VM.getVM().getMinObjAlignmentInBytes()); |
| } |
| |
| // All vm's align longs, so pad out certain offsets. |
| public static long alignObjectOffset(long offset) { |
| return VM.getVM().alignUp(offset, VM.getVM().getBytesPerLong()); |
| } |
| |
| public boolean equals(Object obj) { |
| if (obj != null && (obj instanceof Oop)) { |
| return getHandle().equals(((Oop) obj).getHandle()); |
| } |
| return false; |
| } |
| |
| public int hashCode() { return getHandle().hashCode(); } |
| |
| /** Identity hash in the target VM */ |
| public long identityHash() { |
| Mark mark = getMark(); |
| if (mark.isUnlocked() && (!mark.hasNoHash())) { |
| return (int) mark.hash(); |
| } else if (mark.isMarked()) { |
| return (int) mark.hash(); |
| } else { |
| return slowIdentityHash(); |
| } |
| } |
| |
| public long slowIdentityHash() { |
| return VM.getVM().getObjectSynchronizer().identityHashValueFor(this); |
| } |
| |
| public void iterate(OopVisitor visitor, boolean doVMFields) { |
| visitor.setObj(this); |
| visitor.prologue(); |
| iterateFields(visitor, doVMFields); |
| visitor.epilogue(); |
| } |
| |
| void iterateFields(OopVisitor visitor, boolean doVMFields) { |
| if (doVMFields) { |
| visitor.doCInt(mark, true); |
| if (VM.getVM().isCompressedKlassPointersEnabled()) { |
| visitor.doMetadata(compressedKlass, true); |
| } else { |
| visitor.doMetadata(klass, true); |
| } |
| } |
| } |
| |
| public void print() { printOn(System.out); } |
| public void printValue() { printValueOn(System.out); } |
| public void printRaw() { printRawOn(System.out); } |
| |
| public static void printOopValueOn(Oop obj, PrintStream tty) { |
| if (obj == null) { |
| tty.print("null"); |
| } else { |
| obj.printValueOn(tty); |
| tty.print(" @ " + obj.getHandle()); |
| } |
| } |
| |
| public static void printOopAddressOn(Oop obj, PrintStream tty) { |
| if (obj == null) { |
| tty.print("null"); |
| } else { |
| tty.print(obj.getHandle().toString()); |
| } |
| } |
| |
| public void printOn(PrintStream tty) { |
| OopPrinter printer = new OopPrinter(tty); |
| iterate(printer, true); |
| } |
| |
| public void printValueOn(PrintStream tty) { |
| try { |
| tty.print("Oop for " + getKlass().getName().asString()); |
| } catch (java.lang.NullPointerException e) { |
| tty.print("Oop"); |
| } |
| } |
| |
| public void printRawOn(PrintStream tty) { |
| tty.print("Dumping raw memory for "); |
| printValueOn(tty); |
| tty.println(); |
| long size = getObjectSize() * 4; |
| for (long i = 0; i < size; i += 4) { |
| long memVal = getHandle().getCIntegerAt(i, 4, true); |
| tty.println(Long.toHexString(memVal)); |
| } |
| } |
| |
| public boolean verify() { return true;} |
| |
| // Package-private routine to speed up ObjectHeap.newOop |
| static Klass getKlassForOopHandle(OopHandle handle) { |
| if (handle == null) { |
| return null; |
| } |
| if (VM.getVM().isCompressedKlassPointersEnabled()) { |
| return (Klass)Metadata.instantiateWrapperFor(handle.getCompKlassAddressAt(compressedKlass.getOffset())); |
| } else { |
| return (Klass)Metadata.instantiateWrapperFor(handle.getAddressAt(klass.getOffset())); |
| } |
| } |
| }; |