Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/runtime/ThreadLocalAllocBuffer.java @ 7353:b5280041f59e
Experiment with soft alignment for branch targets.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sun, 13 Jan 2013 19:32:16 +0100 |
parents | c18cbe5936b8 |
children | ec0c4951286c |
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/* * Copyright (c) 2000, 2006, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.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() + ")"); } }