Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/memory/HeapBlock.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/memory/HeapBlock.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,96 @@ +/* + * Copyright 2000-2005 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.runtime.*; +import sun.jvm.hotspot.types.*; + +public class HeapBlock extends VMObject { + private static long heapBlockSize; + private static Field headerField; + // Fields for class Header + private static CIntegerField headerLengthField; + private static CIntegerField headerUsedField; + + static { + VM.registerVMInitializedObserver(new Observer() { + public void update(Observable o, Object data) { + initialize(VM.getVM().getTypeDataBase()); + } + }); + } + + private static void initialize(TypeDataBase db) { + // HeapBlock + Type type = db.lookupType("HeapBlock"); + heapBlockSize = type.getSize(); + headerField = type.getField("_header"); + + // Header + type = db.lookupType("HeapBlock::Header"); + headerLengthField = type.getCIntegerField("_length"); + headerUsedField = type.getCIntegerField("_used"); + } + + public HeapBlock(Address addr) { + super(addr); + } + + public long getLength() { + return getHeader().getLength(); + } + + public boolean isFree() { + return getHeader().isFree(); + } + + public Address getAllocatedSpace() { + return addr.addOffsetTo(heapBlockSize); + } + + //-------------------------------------------------------------------------------- + // Internals only below this point + // + + public static class Header extends VMObject { + public Header(Address addr) { + super(addr); + } + + public long getLength() { + return headerLengthField.getValue(addr); + } + + public boolean isFree() { + return (headerUsedField.getValue(addr) == 0); + } + } + + private Header getHeader() { + return (Header) VMObjectFactory.newObject(HeapBlock.Header.class, addr.addOffsetTo(headerField.getOffset())); + } +}