Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/runtime/ThreadLocalAllocBuffer.java @ 17524:89152779163c
Merge with jdk8-b132
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Wed, 15 Oct 2014 11:59:32 +0200 |
| parents | 4ca6dc0799b6 |
| children |
| rev | line source |
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| 0 | 1 /* |
| 17524 | 2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.runtime; | |
| 26 | |
| 27 import java.io.*; | |
| 28 import java.util.*; | |
| 29 import sun.jvm.hotspot.debugger.*; | |
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30 import sun.jvm.hotspot.oops.*; |
| 0 | 31 import sun.jvm.hotspot.types.*; |
| 32 | |
| 33 /** <P> ThreadLocalAllocBuffer: a descriptor for thread-local storage | |
| 34 used by the threads for allocation. </P> | |
| 35 | |
| 36 <P> It is thread-private at any time, but maybe multiplexed over | |
| 37 time across multiple threads. </P> */ | |
| 38 | |
| 39 public class ThreadLocalAllocBuffer extends VMObject { | |
| 40 private static AddressField startField; | |
| 41 private static AddressField topField; | |
| 42 private static AddressField endField; | |
| 43 private static CIntegerField desired_sizeField; | |
| 44 | |
| 45 static { | |
| 46 VM.registerVMInitializedObserver(new Observer() { | |
| 47 public void update(Observable o, Object data) { | |
| 48 initialize(VM.getVM().getTypeDataBase()); | |
| 49 } | |
| 50 }); | |
| 51 } | |
| 52 | |
| 53 private static synchronized void initialize(TypeDataBase db) { | |
| 54 Type type = db.lookupType("ThreadLocalAllocBuffer"); | |
| 55 | |
| 56 startField = type.getAddressField("_start"); | |
| 57 topField = type.getAddressField("_top"); | |
| 58 endField = type.getAddressField("_end"); | |
| 59 desired_sizeField = type.getCIntegerField("_desired_size"); | |
| 60 } | |
| 61 | |
| 62 public ThreadLocalAllocBuffer(Address addr) { | |
| 63 super(addr); | |
| 64 } | |
| 65 | |
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66 public Address start() { return startField.getValue(addr); } |
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67 public Address end() { return endField.getValue(addr); } |
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68 public Address top() { return topField.getValue(addr); } |
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69 public Address hardEnd() { return end().addOffsetTo(alignmentReserve()); } |
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70 |
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71 private long alignmentReserve() { |
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72 return Oop.alignObjectSize(endReserve()); |
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73 } |
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74 |
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75 private long endReserve() { |
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76 long minFillerArraySize = Array.baseOffsetInBytes(BasicType.T_INT); |
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77 long reserveForAllocationPrefetch = VM.getVM().getReserveForAllocationPrefetch(); |
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78 long heapWordSize = VM.getVM().getHeapWordSize(); |
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79 |
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80 return Math.max(minFillerArraySize, reserveForAllocationPrefetch * heapWordSize); |
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81 } |
| 0 | 82 |
| 83 /** Support for iteration over heap -- not sure how this will | |
| 84 interact with GC in reflective system, but necessary for the | |
| 85 debugging mechanism */ | |
| 86 public OopHandle startAsOopHandle() { | |
| 87 return startField.getOopHandle(addr); | |
| 88 } | |
| 89 | |
| 90 /** Support for iteration over heap -- not sure how this will | |
| 91 interact with GC in reflective system, but necessary for the | |
| 92 debugging mechanism */ | |
| 93 public OopHandle nextOopHandle(OopHandle handle, long size) { | |
| 94 return handle.addOffsetToAsOopHandle(size); | |
| 95 } | |
| 96 | |
| 97 // public int size(); // FIXME: must adjust this to be in bytes | |
| 98 // public int availableSize(); // FIXME: must adjust this to be in bytes | |
| 99 public void print() { | |
| 100 printOn(System.out); | |
| 101 } | |
| 102 | |
| 103 public boolean contains(Address p) { | |
| 104 if (top() == null) { | |
| 105 return false; | |
| 106 } | |
| 107 return (start().lessThanOrEqual(p) && top().greaterThan(p)); | |
| 108 } | |
| 109 | |
| 110 public void printOn(PrintStream tty) { | |
| 111 tty.println(" [" + start() + "," + | |
| 13431 | 112 top() + "," + end() + ",{" + hardEnd() + "})"); |
| 0 | 113 } |
| 114 } |