| /* |
| * Copyright (c) 2000, 2013, 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.oops.*; |
| 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); } |
| public Address hardEnd() { return end().addOffsetTo(alignmentReserve()); } |
| |
| private long alignmentReserve() { |
| return Oop.alignObjectSize(endReserve()); |
| } |
| |
| private long endReserve() { |
| long minFillerArraySize = Array.baseOffsetInBytes(BasicType.T_INT); |
| long reserveForAllocationPrefetch = VM.getVM().getReserveForAllocationPrefetch(); |
| long heapWordSize = VM.getVM().getHeapWordSize(); |
| |
| return Math.max(minFillerArraySize, reserveForAllocationPrefetch * heapWordSize); |
| } |
| |
| /** 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() + ",{" + hardEnd() + "})"); |
| } |
| } |