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comparison src/share/tools/whitebox/sun/hotspot/WhiteBox.java @ 5915:2d503de963b3

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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
date Thu, 23 Feb 2012 14:58:35 +0100
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children 51612f0c0a79
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4956:4ab89de75552 5915:2d503de963b3
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 }