Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/runtime/ThreadLocalAllocBuffer.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/runtime/ThreadLocalAllocBuffer.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,100 @@ +/* + * Copyright 2000-2006 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.runtime; + +import java.io.*; +import java.util.*; +import sun.jvm.hotspot.debugger.*; +import sun.jvm.hotspot.types.*; + +/** <P> ThreadLocalAllocBuffer: a descriptor for thread-local storage + used by the threads for allocation. </P> + + <P> It is thread-private at any time, but maybe multiplexed over + time across multiple threads. </P> */ + +public class ThreadLocalAllocBuffer extends VMObject { + private static AddressField startField; + private static AddressField topField; + private static AddressField endField; + private static CIntegerField desired_sizeField; + + 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("ThreadLocalAllocBuffer"); + + startField = type.getAddressField("_start"); + topField = type.getAddressField("_top"); + endField = type.getAddressField("_end"); + desired_sizeField = type.getCIntegerField("_desired_size"); + } + + public ThreadLocalAllocBuffer(Address addr) { + super(addr); + } + + public Address start() { return startField.getValue(addr); } + public Address end() { return endField.getValue(addr); } + public Address top() { return topField.getValue(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 startAsOopHandle() { + return startField.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); + } + + // public int size(); // FIXME: must adjust this to be in bytes + // public int availableSize(); // FIXME: must adjust this to be in bytes + public void print() { + printOn(System.out); + } + + public boolean contains(Address p) { + if (top() == null) { + return false; + } + return (start().lessThanOrEqual(p) && top().greaterThan(p)); + } + + public void printOn(PrintStream tty) { + tty.println(" [" + start() + "," + + top() + "," + end() + ")"); + } +}