Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/runtime/JNIHandleBlock.java @ 8005:ec0c4951286c
8004710: NPG: jmap could throw sun.jvm.hotspot.types.WrongTypeException after PermGen removal
Summary: When calculating live object regions, make sure that the alignment reserve, at the end of a TLAB, is excluded.
Reviewed-by: jmasa, brutisso
author | stefank |
---|---|
date | Tue, 29 Jan 2013 10:51:33 +0100 |
parents | c18cbe5936b8 |
children |
rev | line source |
---|---|
0 | 1 /* |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
2 * Copyright (c) 2000, 2001, 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.runtime; | |
26 | |
27 import java.util.*; | |
28 import sun.jvm.hotspot.debugger.*; | |
29 import sun.jvm.hotspot.runtime.*; | |
30 import sun.jvm.hotspot.types.*; | |
31 import sun.jvm.hotspot.utilities.*; | |
32 | |
33 /** */ | |
34 public class JNIHandleBlock extends VMObject { | |
35 private static Field handlesField; | |
36 private static CIntegerField topField; | |
37 private static AddressField nextField; | |
38 | |
39 private static int blockSizeInOops; | |
40 | |
41 static { | |
42 VM.registerVMInitializedObserver(new Observer() { | |
43 public void update(Observable o, Object data) { | |
44 initialize(VM.getVM().getTypeDataBase()); | |
45 } | |
46 }); | |
47 } | |
48 | |
49 private static synchronized void initialize(TypeDataBase db) { | |
50 Type type = db.lookupType("JNIHandleBlock"); | |
51 | |
52 handlesField = type.getField("_handles"); | |
53 topField = type.getCIntegerField("_top"); | |
54 nextField = type.getAddressField("_next"); | |
55 | |
56 blockSizeInOops = db.lookupIntConstant("JNIHandleBlock::block_size_in_oops").intValue(); | |
57 } | |
58 | |
59 public JNIHandleBlock(Address addr) { | |
60 super(addr); | |
61 } | |
62 | |
63 public JNIHandleBlock next() { | |
64 Address handleAddr = nextField.getValue(addr); | |
65 if (handleAddr == null) { | |
66 return null; | |
67 } | |
68 | |
69 /* the next handle block is valid only if the current block is full */ | |
70 if (top() < blockSizeInOops) { | |
71 return null; | |
72 } | |
73 return new JNIHandleBlock(handleAddr); | |
74 } | |
75 | |
76 public int top() { | |
77 return (int) topField.getValue(addr); | |
78 } | |
79 | |
80 public void oopsDo(AddressVisitor visitor) { | |
81 // Visit handles in this block | |
82 for (int i = 0; i < top(); i++) { | |
83 Address cur = getOopHandleAddress(i); | |
84 if (cur != null) { | |
85 visitor.visitAddress(cur); | |
86 } | |
87 } | |
88 | |
89 // Visit handles in subsequent blocks if necessary | |
90 JNIHandleBlock n = next(); | |
91 if (n != null) { | |
92 n.oopsDo(visitor); | |
93 } | |
94 } | |
95 | |
96 public OopHandle getOopHandle(int x) { | |
97 Address oopAddr = getOopHandleAddress(x); | |
98 if (oopAddr != null) { | |
99 return oopAddr.getOopHandleAt(0); | |
100 } | |
101 return null; | |
102 } | |
103 | |
104 /** Debugging routine only. Returns non-null JNIHandleBlock | |
105 containing the JNI handle or null if this handle block and its | |
106 successors did not contain it (or if the handle was deleted). */ | |
107 public JNIHandleBlock blockContainingHandle(Address jniHandle) { | |
108 JNIHandleBlock cur = this; | |
109 while (cur != null) { | |
110 if (indexOfHandle(jniHandle) >= 0) { | |
111 return cur; | |
112 } | |
113 cur = cur.next(); | |
114 } | |
115 return null; | |
116 } | |
117 | |
118 /** Debugging routine: returns the index (0..top() - 1) of the | |
119 handle in this block, or -1 if the handle was not contained in | |
120 this block. Does not search successor blocks. */ | |
121 public int indexOfHandle(Address jniHandle) { | |
122 for (int i = 0; i < top(); i++) { | |
123 Address addr = getOopHandleAddress(i); | |
124 if (addr != null) { | |
125 if (addr.equals(jniHandle)) { | |
126 return i; | |
127 } | |
128 } | |
129 } | |
130 return -1; | |
131 } | |
132 | |
133 public String toString() { | |
134 Address handleBase = addr.addOffsetTo(handlesField.getOffset()); | |
135 Address handleEnd = addr.addOffsetTo(handlesField.getOffset() + top() * VM.getVM().getOopSize()); | |
136 return "JNIHandleBlock [" + handleBase + ", " + handleEnd + ")"; | |
137 } | |
138 | |
139 /** Only returns addresses of valid OopHandles */ | |
140 private Address getOopHandleAddress(int x) { | |
141 if (Assert.ASSERTS_ENABLED) { | |
142 Assert.that(x < top(), "out of bounds"); | |
143 } | |
144 | |
145 Address oopAddr = addr.addOffsetTo(handlesField.getOffset() + x * VM.getVM().getOopSize()); | |
146 OopHandle handle = oopAddr.getOopHandleAt(0); | |
147 if (VM.getVM().getUniverse().isInReserved(handle) && !VM.getVM().getJNIHandles().isDeletedHandle(handle)) { | |
148 /* the oop handle is valid only if it is not freed (i.e. reserved in heap) and is not a deleted oop */ | |
149 return oopAddr; | |
150 } else { | |
151 return null; | |
152 } | |
153 } | |
154 } |