Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/memory/Space.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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/* * Copyright 2000-2003 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.io.*; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.types.*; import sun.jvm.hotspot.runtime.*; /** <P> A Space describes a heap area. Class Space is an abstract base class. </P> <P> Space supports allocation, size computation and GC support is provided. </P> <P> Invariant: bottom() and end() are on page_size boundaries and: </P> <P> bottom() <= top() <= end() </P> <P> top() is inclusive and end() is exclusive. </P> */ public abstract class Space extends VMObject { private static AddressField bottomField; private static AddressField endField; 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("Space"); bottomField = type.getAddressField("_bottom"); endField = type.getAddressField("_end"); } public Space(Address addr) { super(addr); } 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); } /** Support for iteration over heap -- not sure how this will interact with GC in reflective system, but necessary for the debugging mechanism */ public OopHandle nextOopHandle(OopHandle handle, long size) { return handle.addOffsetToAsOopHandle(size); } /** returns all MemRegions where live objects are */ public abstract List/*<MemRegion>*/ getLiveRegions(); /** Returned value is in bytes */ public long capacity() { return end().minus(bottom()); } /** Returned value is in bytes */ public abstract long used(); /** Returned value is in bytes */ public abstract long free(); /** Testers */ public boolean contains(Address p) { return (bottom().lessThanOrEqual(p) && end().greaterThan(p)); } public void print() { printOn(System.out); } public void printOn(PrintStream tty) { tty.print(" space capacity = "); tty.print(capacity()); tty.print(", "); tty.print((double) used() * 100.0/ capacity()); tty.print(" used"); } }