Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/livejvm/JNIHandleAccessor.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 package sun.jvm.hotspot.livejvm; | |
26 | |
27 import sun.jvm.hotspot.debugger.*; | |
28 import sun.jvm.hotspot.oops.*; | |
29 import sun.jvm.hotspot.utilities.*; | |
30 | |
31 class JNIHandleAccessor { | |
32 private Address addr; | |
33 private ObjectHeap heap; | |
34 | |
35 JNIHandleAccessor(Address addr, ObjectHeap heap) { | |
36 this.addr = addr; | |
37 this.heap = heap; | |
38 } | |
39 | |
40 Oop getValue() { | |
41 // Accessing the contents of the JNIHandle is a double dereference | |
42 Address handle = addr.getAddressAt(0); | |
43 if (handle == null) return null; | |
44 return heap.newOop(handle.getOopHandleAt(0)); | |
45 } | |
46 | |
47 void setValue(Oop value) { | |
48 Address handle = addr.getAddressAt(0); | |
49 if (Assert.ASSERTS_ENABLED) { | |
50 Assert.that(handle != null, "Must have valid global JNI handle for setting"); | |
51 } | |
52 handle.setOopHandleAt(0, value.getHandle()); | |
53 } | |
54 } |