Mercurial > hg > truffle
comparison src/share/tools/whitebox/sun/hotspot/WhiteBox.java @ 5915:2d503de963b3
7148152: Add whitebox testing API to HotSpot
Summary: Add an internal testing API to HotSpot to enable more targeted testing of vm functionality
Reviewed-by: phh, dholmes
author | mgerdin |
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date | Thu, 23 Feb 2012 14:58:35 +0100 |
parents | |
children | 51612f0c0a79 |
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4956:4ab89de75552 | 5915:2d503de963b3 |
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1 /* | |
2 * Copyright (c) 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 package sun.hotspot; | |
26 import java.security.BasicPermission; | |
27 | |
28 public class WhiteBox { | |
29 | |
30 @SuppressWarnings("serial") | |
31 public static class WhiteBoxPermission extends BasicPermission { | |
32 public WhiteBoxPermission(String s) { | |
33 super(s); | |
34 } | |
35 } | |
36 | |
37 private WhiteBox() {} | |
38 private static final WhiteBox instance = new WhiteBox(); | |
39 private static native void registerNatives(); | |
40 | |
41 /** | |
42 * Returns the singleton WhiteBox instance. | |
43 * | |
44 * The returned WhiteBox object should be carefully guarded | |
45 * by the caller, since it can be used to read and write data | |
46 * at arbitrary memory addresses. It must never be passed to | |
47 * untrusted code. | |
48 */ | |
49 public synchronized static WhiteBox getWhiteBox() { | |
50 SecurityManager sm = System.getSecurityManager(); | |
51 if (sm != null) { | |
52 sm.checkPermission(new WhiteBoxPermission("getInstance")); | |
53 } | |
54 return instance; | |
55 } | |
56 | |
57 static { | |
58 registerNatives(); | |
59 } | |
60 | |
61 // Memory | |
62 public native long getObjectAddress(Object o); | |
63 public native int getHeapOopSize(); | |
64 | |
65 // G1 | |
66 public native boolean g1InConcurrentMark(); | |
67 public native boolean g1IsHumongous(Object o); | |
68 public native long g1NumFreeRegions(); | |
69 public native int g1RegionSize(); | |
70 } |