Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/memory/Space.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/memory/Space.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,114 @@ +/* + * 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"); + } +}