Mercurial > hg > graal-compiler
view agent/src/share/classes/sun/jvm/hotspot/gc_implementation/shared/ImmutableSpace.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 | c18cbe5936b8 |
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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.gc_implementation.shared; import java.io.*; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.memory.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.types.*; public abstract class ImmutableSpace 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("ImmutableSpace"); bottomField = type.getAddressField("_bottom"); endField = type.getAddressField("_end"); } public ImmutableSpace(Address addr) { super(addr); } // Fields private static AddressField bottomField; private static AddressField endField; // Accessors public Address bottom() { return bottomField.getValue(addr); } public Address end() { return endField.getValue(addr); } /** Returns a subregion of the space containing all the objects in the space. */ public MemRegion usedRegion() { return new MemRegion(bottom(), end()); } /** Support for iteration over heap -- not sure how this will interact with GC in reflective system, but necessary for the debugging mechanism */ public OopHandle bottomAsOopHandle() { return bottomField.getOopHandle(addr); } /** returns all MemRegions where live objects are */ public abstract List/*<MemRegion>*/ getLiveRegions(); /** Returned value is in bytes */ public long capacity() { return end().minus(bottom()); } public abstract long used(); /** Testers */ public boolean contains(Address p) { return (bottom().lessThanOrEqual(p) && end().greaterThan(p)); } public void print() { printOn(System.out); } public abstract void printOn(PrintStream tty); }