1 /* 2 * Copyright (c) 2012, 2013 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 27 import java.lang.reflect.Method; 28 import java.security.BasicPermission; 29 import sun.hotspot.parser.DiagnosticCommand; 30 31 public class WhiteBox { 32 33 @SuppressWarnings("serial") 34 public static class WhiteBoxPermission extends BasicPermission { 35 public WhiteBoxPermission(String s) { 36 super(s); 37 } 38 } 39 40 private WhiteBox() {} 41 private static final WhiteBox instance = new WhiteBox(); 42 private static native void registerNatives(); 43 44 /** 45 * Returns the singleton WhiteBox instance. 46 * 47 * The returned WhiteBox object should be carefully guarded 48 * by the caller, since it can be used to read and write data 49 * at arbitrary memory addresses. It must never be passed to 50 * untrusted code. 51 */ 52 public synchronized static WhiteBox getWhiteBox() { 53 SecurityManager sm = System.getSecurityManager(); 54 if (sm != null) { 55 sm.checkPermission(new WhiteBoxPermission("getInstance")); 56 } 57 return instance; 58 } 59 60 static { 61 registerNatives(); 62 } 63 64 // Memory 65 public native long getObjectAddress(Object o); 66 public native int getHeapOopSize(); 67 68 // Runtime 69 // Make sure class name is in the correct format 70 public boolean isClassAlive(String name) { 71 return isClassAlive0(name.replace('.', '/')); 72 } 73 private native boolean isClassAlive0(String name); 74 75 // G1 76 public native boolean g1InConcurrentMark(); 77 public native boolean g1IsHumongous(Object o); 78 public native long g1NumFreeRegions(); 79 public native int g1RegionSize(); 80 public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args); 81 82 // NMT 83 public native boolean NMTAllocTest(); 84 public native boolean NMTFreeTestMemory(); 85 public native boolean NMTWaitForDataMerge(); 86 87 // Compiler 88 public native void deoptimizeAll(); 89 public native boolean isMethodCompiled(Method method); 90 public native boolean isMethodCompilable(Method method); 91 public native boolean isMethodQueuedForCompilation(Method method); 92 public native int deoptimizeMethod(Method method); 93 public native void makeMethodNotCompilable(Method method); 94 public native int getMethodCompilationLevel(Method method); 95 public native boolean setDontInlineMethod(Method method, boolean value); 96 public native int getCompileQueuesSize(); 97 }