Mercurial > hg > graal-jvmci-8
annotate agent/src/share/classes/sun/jvm/hotspot/memory/CodeHeap.java @ 2177:3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
author | coleenp |
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date | Thu, 27 Jan 2011 16:11:27 -0800 |
parents | c18cbe5936b8 |
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rev | line source |
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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 |
c18cbe5936b8
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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 } |