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5915
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 package sun.hotspot;
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26 import java.security.BasicPermission;
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27
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28 public class WhiteBox {
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29
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30 @SuppressWarnings("serial")
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31 public static class WhiteBoxPermission extends BasicPermission {
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32 public WhiteBoxPermission(String s) {
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33 super(s);
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34 }
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35 }
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36
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37 private WhiteBox() {}
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38 private static final WhiteBox instance = new WhiteBox();
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39 private static native void registerNatives();
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40
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41 /**
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42 * Returns the singleton WhiteBox instance.
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43 *
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44 * The returned WhiteBox object should be carefully guarded
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45 * by the caller, since it can be used to read and write data
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46 * at arbitrary memory addresses. It must never be passed to
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47 * untrusted code.
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48 */
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49 public synchronized static WhiteBox getWhiteBox() {
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50 SecurityManager sm = System.getSecurityManager();
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51 if (sm != null) {
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52 sm.checkPermission(new WhiteBoxPermission("getInstance"));
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53 }
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54 return instance;
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55 }
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56
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57 static {
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58 registerNatives();
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59 }
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60
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61 // Memory
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62 public native long getObjectAddress(Object o);
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63 public native int getHeapOopSize();
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64
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65 // G1
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66 public native boolean g1InConcurrentMark();
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67 public native boolean g1IsHumongous(Object o);
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68 public native long g1NumFreeRegions();
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69 public native int g1RegionSize();
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70 }
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