Mercurial > hg > truffle
view 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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/* * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ package sun.hotspot; import java.security.BasicPermission; public class WhiteBox { @SuppressWarnings("serial") public static class WhiteBoxPermission extends BasicPermission { public WhiteBoxPermission(String s) { super(s); } } private WhiteBox() {} private static final WhiteBox instance = new WhiteBox(); private static native void registerNatives(); /** * Returns the singleton WhiteBox instance. * * The returned WhiteBox object should be carefully guarded * by the caller, since it can be used to read and write data * at arbitrary memory addresses. It must never be passed to * untrusted code. */ public synchronized static WhiteBox getWhiteBox() { SecurityManager sm = System.getSecurityManager(); if (sm != null) { sm.checkPermission(new WhiteBoxPermission("getInstance")); } return instance; } static { registerNatives(); } // Memory public native long getObjectAddress(Object o); public native int getHeapOopSize(); // G1 public native boolean g1InConcurrentMark(); public native boolean g1IsHumongous(Object o); public native long g1NumFreeRegions(); public native int g1RegionSize(); }