Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/memory/LoaderConstraintEntry.java @ 11997:cd25d3be91c5
8012144: multiple SIGSEGVs fails on staxf
Summary: Forward port of 7u change to add additional fence() on RMO platforms, with a load_acquire on all platforms
Reviewed-by: dholmes, kvn
author | vladidan |
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date | Tue, 06 Aug 2013 20:01:40 -0400 |
parents | 1d1603768966 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2011, 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.oops.*; | |
30 import sun.jvm.hotspot.types.*; | |
31 import sun.jvm.hotspot.runtime.*; | |
32 import sun.jvm.hotspot.utilities.*; | |
33 | |
34 public class LoaderConstraintEntry extends sun.jvm.hotspot.utilities.HashtableEntry { | |
35 static { | |
36 VM.registerVMInitializedObserver(new Observer() { | |
37 public void update(Observable o, Object data) { | |
38 initialize(VM.getVM().getTypeDataBase()); | |
39 } | |
40 }); | |
41 } | |
42 | |
43 private static synchronized void initialize(TypeDataBase db) { | |
44 Type type = db.lookupType("LoaderConstraintEntry"); | |
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45 nameField = type.getAddressField("_name"); |
0 | 46 numLoadersField = type.getCIntegerField("_num_loaders"); |
47 maxLoadersField = type.getCIntegerField("_max_loaders"); | |
48 loadersField = type.getAddressField("_loaders"); | |
49 } | |
50 | |
51 // Fields | |
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52 private static AddressField nameField; |
0 | 53 private static CIntegerField numLoadersField; |
54 private static CIntegerField maxLoadersField; | |
55 private static AddressField loadersField; | |
56 | |
57 // Accessors | |
58 | |
59 public Symbol name() { | |
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60 return Symbol.create(nameField.getValue(addr)); |
0 | 61 } |
62 | |
63 public int numLoaders() { | |
64 return (int) numLoadersField.getValue(addr); | |
65 } | |
66 | |
67 public int maxLoaders() { | |
68 return (int) maxLoadersField.getValue(addr); | |
69 } | |
70 | |
71 public Oop initiatingLoader(int i) { | |
72 if (Assert.ASSERTS_ENABLED) { | |
73 Assert.that(i >= 0 && i < numLoaders(), "invalid index"); | |
74 } | |
75 Address loaders = loadersField.getValue(addr); | |
76 OopHandle loader = loaders.addOffsetToAsOopHandle(i * VM.getVM().getOopSize()); | |
77 return VM.getVM().getObjectHeap().newOop(loader); | |
78 } | |
79 | |
80 public LoaderConstraintEntry(Address addr) { | |
81 super(addr); | |
82 } | |
83 | |
84 /* covariant return type :-( | |
85 public LoaderConstraintEntry next() { | |
86 return (LoaderConstraintEntry) super.next(); | |
87 } | |
88 For now, let the caller cast it .. | |
89 */ | |
90 } |