Mercurial > hg > graal-compiler
view agent/src/share/classes/sun/jvm/hotspot/memory/FreeChunk.java @ 132:60b728ec77c1
6652736: well known classes in system dictionary are inefficiently processed
Summary: combine many scalar variables into a single enum-indexed array in SystemDictionary.
Reviewed-by: kvn
author | jrose |
---|---|
date | Tue, 29 Apr 2008 19:45:22 -0700 |
parents | a61af66fc99e |
children | 790e66e5fbac |
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/* * Copyright 2003 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.memory; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.types.*; import sun.jvm.hotspot.runtime.*; public class FreeChunk extends VMObject { static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) { Type type = db.lookupType("FreeChunk"); nextField = type.getAddressField("_next"); prevField = type.getAddressField("_prev"); sizeField = type.getCIntegerField("_size"); } // Fields private static AddressField nextField; private static AddressField prevField; private static CIntegerField sizeField; // Accessors public FreeChunk next() { return (FreeChunk) VMObjectFactory.newObject(FreeChunk.class, nextField.getValue(addr)); } public FreeChunk prev() { Address prev = prevField.getValue(addr).andWithMask(~0x3); return (FreeChunk) VMObjectFactory.newObject(FreeChunk.class, prev); } public long size() { return sizeField.getValue(addr); } public FreeChunk(Address addr) { super(addr); } public static boolean secondWordIndicatesFreeChunk(long word) { return (word & 0x1L) == 0x1L; } public boolean isFree() { Debugger dbg = VM.getVM().getDebugger(); Address prev = prevField.getValue(addr); return secondWordIndicatesFreeChunk(dbg.getAddressValue(prev)); } }