Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/oops/Oop.java @ 669:eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
Summary: Change create_vm() to load and initialize StringValue rather than String.
Reviewed-by: kvn
author | phh |
---|---|
date | Tue, 24 Mar 2009 21:56:53 -0400 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 2d127394260e |
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/* * Copyright 2000-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.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()); } } };