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/*
* Copyright (c) 2000, 2008, 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.*;
import sun.jvm.hotspot.memory.CompactingPermGenGen;
// 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 OopField(type.getOopField("_metadata._klass"), 0);
compressedKlass = new NarrowOopField(type.getOopField("_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 OopField klass;
private static NarrowOopField compressedKlass;
public boolean isShared() {
return CompactingPermGenGen.isShared(handle);
}
public boolean isSharedReadOnly() {
return CompactingPermGenGen.isSharedReadOnly(handle);
}
public boolean isSharedReadWrite() {
return CompactingPermGenGen.isSharedReadWrite(handle);
}
// Accessors for declared fields
public Mark getMark() { return new Mark(getHandle()); }
public Klass getKlass() {
if (VM.getVM().isCompressedOopsEnabled()) {
return (Klass) compressedKlass.getValue(this);
} else {
return (Klass) klass.getValue(this);
}
}
public boolean isA(Klass k) {
return getKlass().isSubtypeOf(k);
}
// Returns the byte size of this object
public long getObjectSize() {
Klass k = getKlass();
if (k instanceof InstanceKlass) {
return ((InstanceKlass)k).getSizeHelper()
* VM.getVM().getAddressSize();
}
// If it is not an instance, this method should be replaced.
return getHeaderSize();
}
// 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 isSymbol() { return false; }
public boolean isKlass() { return false; }
public boolean isThread() { return false; }
public boolean isMethod() { return false; }
public boolean isMethodData() { return false; }
public boolean isConstantPool() { return false; }
public boolean isConstantPoolCache() { return false; }
public boolean isCompiledICHolder() { return false; }
// Align the object size.
public static long alignObjectSize(long size) {
return VM.getVM().alignUp(size, VM.getVM().getMinObjAlignment());
}
// 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().isCompressedOopsEnabled()) {
visitor.doOop(compressedKlass, true);
} else {
visitor.doOop(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 OopHandle getKlassForOopHandle(OopHandle handle) {
if (handle == null) {
return null;
}
if (VM.getVM().isCompressedOopsEnabled()) {
return handle.getCompOopHandleAt(compressedKlass.getOffset());
} else {
return handle.getOopHandleAt(klass.getOffset());
}
}
};
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