Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/memory/CodeHeap.java @ 8059:49618582fc5b
8004840: Jstack seems to output unnecessary information in 7u9
Reviewed-by: dholmes, coleenp, sspitsyn, rbackman
| author | sla |
|---|---|
| date | Thu, 14 Feb 2013 13:08:15 +0100 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 2000, 2004, 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.memory; | |
| 26 | |
| 27 import java.util.*; | |
| 28 import sun.jvm.hotspot.debugger.*; | |
| 29 import sun.jvm.hotspot.runtime.*; | |
| 30 import sun.jvm.hotspot.types.*; | |
| 31 | |
| 32 public class CodeHeap extends VMObject { | |
| 33 private static Field memoryField; | |
| 34 private static Field segmapField; | |
| 35 // private static CIntegerField numberOfCommittedSegmentsField; | |
| 36 // private static CIntegerField numberOfReservedSegmentsField; | |
| 37 // private static CIntegerField segmentSizeField; | |
| 38 private static CIntegerField log2SegmentSizeField; | |
| 39 // private static CIntegerField nextSegmentField; | |
| 40 // private static AddressField freelistField; | |
| 41 // private static CIntegerField freeSegmentsField; | |
| 42 | |
| 43 private VirtualSpace memory; | |
| 44 private VirtualSpace segmentMap; | |
| 45 private int log2SegmentSize; | |
| 46 | |
| 47 static { | |
| 48 VM.registerVMInitializedObserver(new Observer() { | |
| 49 public void update(Observable o, Object data) { | |
| 50 initialize(VM.getVM().getTypeDataBase()); | |
| 51 } | |
| 52 }); | |
| 53 } | |
| 54 | |
| 55 private static void initialize(TypeDataBase db) { | |
| 56 Type type = db.lookupType("CodeHeap"); | |
| 57 | |
| 58 memoryField = type.getField("_memory"); | |
| 59 segmapField = type.getField("_segmap"); | |
| 60 log2SegmentSizeField = type.getCIntegerField("_log2_segment_size"); | |
| 61 | |
| 62 } | |
| 63 | |
| 64 public CodeHeap(Address addr) { | |
| 65 super(addr); | |
| 66 log2SegmentSize = (int) log2SegmentSizeField.getValue(addr); | |
| 67 segmentMap = new VirtualSpace(addr.addOffsetTo(segmapField.getOffset())); | |
| 68 memory = new VirtualSpace(addr.addOffsetTo(memoryField.getOffset())); | |
| 69 } | |
| 70 | |
| 71 public Address begin() { | |
| 72 return getMemory().low(); | |
| 73 } | |
| 74 | |
| 75 public Address end() { | |
| 76 return getMemory().high(); | |
| 77 } | |
| 78 | |
| 79 public boolean contains(Address p) { | |
| 80 return (begin().lessThanOrEqual(p) && end().greaterThan(p)); | |
| 81 } | |
| 82 | |
| 83 /** Returns the start of the block containing p or null */ | |
| 84 public Address findStart(Address p) { | |
| 85 if (!contains(p)) return null; | |
| 86 HeapBlock h = blockStart(p); | |
| 87 if (h == null || h.isFree()) { | |
| 88 return null; | |
| 89 } | |
| 90 return h.getAllocatedSpace(); | |
| 91 } | |
| 92 | |
| 93 public Address nextBlock(Address ptr) { | |
| 94 Address base = blockBase(ptr); | |
| 95 if (base == null) { | |
| 96 return null; | |
| 97 } | |
| 98 HeapBlock block = getBlockAt(base); | |
| 99 return base.addOffsetTo(block.getLength() * (1 << getLog2SegmentSize())); | |
| 100 } | |
| 101 | |
| 102 //-------------------------------------------------------------------------------- | |
| 103 // Internals only below this point | |
| 104 // | |
| 105 | |
| 106 private VirtualSpace getMemory() { | |
| 107 return memory; | |
| 108 } | |
| 109 | |
| 110 private VirtualSpace getSegmentMap() { | |
| 111 return segmentMap; | |
| 112 } | |
| 113 | |
| 114 private long segmentFor(Address p) { | |
| 115 return p.minus(getMemory().low()) >> getLog2SegmentSize(); | |
| 116 } | |
| 117 | |
| 118 private int getLog2SegmentSize() { | |
| 119 return log2SegmentSize; | |
| 120 } | |
| 121 | |
| 122 private HeapBlock getBlockAt(Address addr) { | |
| 123 return (HeapBlock) VMObjectFactory.newObject(HeapBlock.class, addr); | |
| 124 } | |
| 125 | |
| 126 | |
| 127 private HeapBlock blockStart(Address p) { | |
| 128 Address base = blockBase(p); | |
| 129 if (base == null) return null; | |
| 130 return getBlockAt(base); | |
| 131 } | |
| 132 | |
| 133 private Address blockBase(Address p) { | |
| 134 long i = segmentFor(p); | |
| 135 Address b = getSegmentMap().low(); | |
| 136 if (b.getCIntegerAt(i, 1, true) == 0xFF) { | |
| 137 return null; | |
| 138 } | |
| 139 while (b.getCIntegerAt(i, 1, true) > 0) { | |
| 140 i -= b.getCIntegerAt(i, 1, true); | |
| 141 } | |
| 142 return getMemory().low().addOffsetTo(i << getLog2SegmentSize()); | |
| 143 } | |
| 144 | |
| 145 } |