author | kvn |
Thu, 27 May 2010 18:01:56 -0700 | |
changeset 5694 | 1e0532a6abff |
parent 670 | ddf3e9583f2f |
child 5702 | 201c5cde25bb |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2000-2008 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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package sun.jvm.hotspot.oops; |
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import java.io.*; |
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import java.util.*; |
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import sun.jvm.hotspot.utilities.*; |
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import sun.jvm.hotspot.debugger.*; |
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import sun.jvm.hotspot.runtime.*; |
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import sun.jvm.hotspot.types.*; |
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import sun.jvm.hotspot.memory.CompactingPermGenGen; |
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// Oop represents the superclass for all types of |
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// objects in the HotSpot object heap. |
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public class Oop { |
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static { |
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VM.registerVMInitializedObserver(new Observer() { |
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public void update(Observable o, Object data) { |
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initialize(VM.getVM().getTypeDataBase()); |
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} |
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}); |
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} |
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private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { |
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Type type = db.lookupType("oopDesc"); |
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mark = new CIntField(type.getCIntegerField("_mark"), 0); |
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klass = new OopField(type.getOopField("_metadata._klass"), 0); |
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compressedKlass = new NarrowOopField(type.getOopField("_metadata._compressed_klass"), 0); |
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headerSize = type.getSize(); |
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} |
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private OopHandle handle; |
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private ObjectHeap heap; |
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Oop(OopHandle handle, ObjectHeap heap) { |
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this.handle = handle; |
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this.heap = heap; |
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} |
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ObjectHeap getHeap() { return heap; } |
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/** Should not be used or needed by most clients outside this |
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package; is needed, however, by {@link |
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sun.jvm.hotspot.utilities.MarkBits}. */ |
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public OopHandle getHandle() { return handle; } |
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private static long headerSize; |
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public static long getHeaderSize() { return headerSize; } // Header size in bytes. |
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private static CIntField mark; |
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private static OopField klass; |
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private static NarrowOopField compressedKlass; |
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public boolean isShared() { |
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return CompactingPermGenGen.isShared(handle); |
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} |
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public boolean isSharedReadOnly() { |
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return CompactingPermGenGen.isSharedReadOnly(handle); |
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} |
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public boolean isSharedReadWrite() { |
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return CompactingPermGenGen.isSharedReadWrite(handle); |
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} |
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// Accessors for declared fields |
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public Mark getMark() { return new Mark(getHandle()); } |
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public Klass getKlass() { |
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if (VM.getVM().isCompressedOopsEnabled()) { |
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return (Klass) compressedKlass.getValue(this); |
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} else { |
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return (Klass) klass.getValue(this); |
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} |
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} |
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public boolean isA(Klass k) { |
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return getKlass().isSubtypeOf(k); |
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} |
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// Returns the byte size of this object |
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public long getObjectSize() { |
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Klass k = getKlass(); |
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if (k instanceof InstanceKlass) { |
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return ((InstanceKlass)k).getSizeHelper() |
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* VM.getVM().getAddressSize(); |
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} |
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// If it is not an instance, this method should be replaced. |
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return getHeaderSize(); |
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} |
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// Type test operations |
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public boolean isInstance() { return false; } |
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public boolean isInstanceRef() { return false; } |
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public boolean isArray() { return false; } |
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public boolean isObjArray() { return false; } |
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public boolean isTypeArray() { return false; } |
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public boolean isSymbol() { return false; } |
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public boolean isKlass() { return false; } |
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public boolean isThread() { return false; } |
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public boolean isMethod() { return false; } |
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public boolean isMethodData() { return false; } |
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public boolean isConstantPool() { return false; } |
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public boolean isConstantPoolCache() { return false; } |
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public boolean isCompiledICHolder() { return false; } |
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// Align the object size. |
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public static long alignObjectSize(long size) { |
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return VM.getVM().alignUp(size, VM.getVM().getMinObjAlignmentInBytes()); |
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} |
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// All vm's align longs, so pad out certain offsets. |
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public static long alignObjectOffset(long offset) { |
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return VM.getVM().alignUp(offset, VM.getVM().getBytesPerLong()); |
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} |
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public boolean equals(Object obj) { |
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if (obj != null && (obj instanceof Oop)) { |
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return getHandle().equals(((Oop) obj).getHandle()); |
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} |
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return false; |
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} |
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public int hashCode() { return getHandle().hashCode(); } |
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/** Identity hash in the target VM */ |
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public long identityHash() { |
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Mark mark = getMark(); |
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if (mark.isUnlocked() && (!mark.hasNoHash())) { |
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return (int) mark.hash(); |
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} else if (mark.isMarked()) { |
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return (int) mark.hash(); |
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} else { |
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return slowIdentityHash(); |
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} |
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} |
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public long slowIdentityHash() { |
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return VM.getVM().getObjectSynchronizer().identityHashValueFor(this); |
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} |
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public void iterate(OopVisitor visitor, boolean doVMFields) { |
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visitor.setObj(this); |
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visitor.prologue(); |
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iterateFields(visitor, doVMFields); |
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visitor.epilogue(); |
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} |
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void iterateFields(OopVisitor visitor, boolean doVMFields) { |
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if (doVMFields) { |
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visitor.doCInt(mark, true); |
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if (VM.getVM().isCompressedOopsEnabled()) { |
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visitor.doOop(compressedKlass, true); |
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} else { |
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visitor.doOop(klass, true); |
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} |
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} |
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} |
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public void print() { printOn(System.out); } |
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public void printValue() { printValueOn(System.out); } |
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public void printRaw() { printRawOn(System.out); } |
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public static void printOopValueOn(Oop obj, PrintStream tty) { |
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if (obj == null) { |
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tty.print("null"); |
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} else { |
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obj.printValueOn(tty); |
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tty.print(" @ " + obj.getHandle()); |
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} |
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} |
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public static void printOopAddressOn(Oop obj, PrintStream tty) { |
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if (obj == null) { |
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tty.print("null"); |
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} else { |
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tty.print(obj.getHandle().toString()); |
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} |
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} |
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public void printOn(PrintStream tty) { |
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OopPrinter printer = new OopPrinter(tty); |
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iterate(printer, true); |
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} |
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public void printValueOn(PrintStream tty) { |
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try { |
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tty.print("Oop for " + getKlass().getName().asString()); |
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} catch (java.lang.NullPointerException e) { |
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tty.print("Oop"); |
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} |
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} |
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public void printRawOn(PrintStream tty) { |
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tty.print("Dumping raw memory for "); |
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printValueOn(tty); |
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tty.println(); |
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long size = getObjectSize() * 4; |
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for (long i = 0; i < size; i += 4) { |
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long memVal = getHandle().getCIntegerAt(i, 4, true); |
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tty.println(Long.toHexString(memVal)); |
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} |
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} |
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public boolean verify() { return true;} |
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// Package-private routine to speed up ObjectHeap.newOop |
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static OopHandle getKlassForOopHandle(OopHandle handle) { |
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if (handle == null) { |
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return null; |
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} |
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if (VM.getVM().isCompressedOopsEnabled()) { |
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return handle.getCompOopHandleAt(compressedKlass.getOffset()); |
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} else { |
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return handle.getOopHandleAt(klass.getOffset()); |
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} |
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} |
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}; |