1 /* 2 * Copyright (c) 2012, 2014, 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.Executable; 28 import java.util.Arrays; 29 import java.util.List; 30 import java.util.function.Function; 31 import java.util.stream.Stream; 32 import java.security.BasicPermission; 33 34 import sun.hotspot.parser.DiagnosticCommand; 35 36 public class WhiteBox { 37 38 @SuppressWarnings("serial") 39 public static class WhiteBoxPermission extends BasicPermission { 40 public WhiteBoxPermission(String s) { 41 super(s); 42 } 43 } 44 45 private WhiteBox() {} 46 private static final WhiteBox instance = new WhiteBox(); 47 private static native void registerNatives(); 48 49 /** 50 * Returns the singleton WhiteBox instance. 51 * 52 * The returned WhiteBox object should be carefully guarded 53 * by the caller, since it can be used to read and write data 54 * at arbitrary memory addresses. It must never be passed to 55 * untrusted code. 56 */ 57 public synchronized static WhiteBox getWhiteBox() { 58 SecurityManager sm = System.getSecurityManager(); 59 if (sm != null) { 60 sm.checkPermission(new WhiteBoxPermission("getInstance")); 61 } 62 return instance; 63 } 64 65 static { 66 registerNatives(); 67 } 68 69 // Get the maximum heap size supporting COOPs 70 public native long getCompressedOopsMaxHeapSize(); 71 // Arguments 72 public native void printHeapSizes(); 73 74 // Memory 75 public native long getObjectAddress(Object o); 76 public native int getHeapOopSize(); 77 public native boolean isObjectInOldGen(Object o); 78 public native long getObjectSize(Object o); 79 80 // Runtime 81 // Make sure class name is in the correct format 82 public boolean isClassAlive(String name) { 83 return isClassAlive0(name.replace('.', '/')); 84 } 85 private native boolean isClassAlive0(String name); 86 87 // G1 88 public native boolean g1InConcurrentMark(); 89 public native boolean g1IsHumongous(Object o); 90 public native long g1NumFreeRegions(); 91 public native int g1RegionSize(); 92 public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args); 93 94 // NMT 95 public native long NMTMalloc(long size); 96 public native void NMTFree(long mem); 97 public native long NMTReserveMemory(long size); 98 public native void NMTCommitMemory(long addr, long size); 99 public native void NMTUncommitMemory(long addr, long size); 100 public native void NMTReleaseMemory(long addr, long size); 101 public native long NMTMallocWithPseudoStack(long size, int index); 102 public native boolean NMTIsDetailSupported(); 103 public native boolean NMTChangeTrackingLevel(); 104 public native int NMTGetHashSize(); 105 106 // Compiler 107 public native void deoptimizeAll(); 108 public boolean isMethodCompiled(Executable method) { 109 return isMethodCompiled(method, false /*not osr*/); 110 } 111 public native boolean isMethodCompiled(Executable method, boolean isOsr); 112 public boolean isMethodCompilable(Executable method) { 113 return isMethodCompilable(method, -1 /*any*/); 114 } 115 public boolean isMethodCompilable(Executable method, int compLevel) { 116 return isMethodCompilable(method, compLevel, false /*not osr*/); 117 } 118 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr); 119 public native boolean isMethodQueuedForCompilation(Executable method); 120 public int deoptimizeMethod(Executable method) { 121 return deoptimizeMethod(method, false /*not osr*/); 122 } 123 public native int deoptimizeMethod(Executable method, boolean isOsr); 124 public void makeMethodNotCompilable(Executable method) { 125 makeMethodNotCompilable(method, -1 /*any*/); 126 } 127 public void makeMethodNotCompilable(Executable method, int compLevel) { 128 makeMethodNotCompilable(method, compLevel, false /*not osr*/); 129 } 130 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr); 131 public int getMethodCompilationLevel(Executable method) { 132 return getMethodCompilationLevel(method, false /*not ost*/); 133 } 134 public native int getMethodCompilationLevel(Executable method, boolean isOsr); 135 public native boolean testSetDontInlineMethod(Executable method, boolean value); 136 public int getCompileQueuesSize() { 137 return getCompileQueueSize(-1 /*any*/); 138 } 139 public native int getCompileQueueSize(int compLevel); 140 public native boolean testSetForceInlineMethod(Executable method, boolean value); 141 public boolean enqueueMethodForCompilation(Executable method, int compLevel) { 142 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); 143 } 144 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci); 145 public native void clearMethodState(Executable method); 146 public native void lockCompilation(); 147 public native void unlockCompilation(); 148 public native int getMethodEntryBci(Executable method); 149 public native Object[] getNMethod(Executable method, boolean isOsr); 150 public native long allocateCodeBlob(int size, int type); 151 public native void freeCodeBlob(long addr); 152 public native void forceNMethodSweep(); 153 public native Object[] getCodeHeapEntries(int type); 154 public native int getCompilationActivityMode(); 155 public native Object[] getCodeBlob(long addr); 156 157 // Intered strings 158 public native boolean isInStringTable(String str); 159 160 // Memory 161 public native void readReservedMemory(); 162 public native long allocateMetaspace(ClassLoader classLoader, long size); 163 public native void freeMetaspace(ClassLoader classLoader, long addr, long size); 164 public native long incMetaspaceCapacityUntilGC(long increment); 165 public native long metaspaceCapacityUntilGC(); 166 167 // force Young GC 168 public native void youngGC(); 169 170 // force Full GC 171 public native void fullGC(); 172 173 // Tests on ReservedSpace/VirtualSpace classes 174 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); 175 public native void runMemoryUnitTests(); 176 public native void readFromNoaccessArea(); 177 public native long getThreadStackSize(); 178 public native long getThreadRemainingStackSize(); 179 180 // CPU features 181 public native String getCPUFeatures(); 182 183 // Native extensions 184 public native long getHeapUsageForContext(int context); 185 public native long getHeapRegionCountForContext(int context); 186 public native int getContextForObject(Object obj); 187 public native void printRegionInfo(int context); 188 189 // VM flags 190 public native boolean isConstantVMFlag(String name); 191 public native boolean isLockedVMFlag(String name); 192 public native void setBooleanVMFlag(String name, boolean value); 193 public native void setIntxVMFlag(String name, long value); 194 public native void setUintxVMFlag(String name, long value); 195 public native void setUint64VMFlag(String name, long value); 196 public native void setSizeTVMFlag(String name, long value); 197 public native void setStringVMFlag(String name, String value); 198 public native void setDoubleVMFlag(String name, double value); 199 public native Boolean getBooleanVMFlag(String name); 200 public native Long getIntxVMFlag(String name); 201 public native Long getUintxVMFlag(String name); 202 public native Long getUint64VMFlag(String name); 203 public native Long getSizeTVMFlag(String name); 204 public native String getStringVMFlag(String name); 205 public native Double getDoubleVMFlag(String name); 206 private final List<Function<String,Object>> flagsGetters = Arrays.asList( 207 this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag, 208 this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag, 209 this::getDoubleVMFlag); 210 211 public Object getVMFlag(String name) { 212 return flagsGetters.stream() 213 .map(f -> f.apply(name)) 214 .filter(x -> x != null) 215 .findAny() 216 .orElse(null); 217 } 218 public native int getOffsetForName0(String name); 219 public int getOffsetForName(String name) throws Exception { 220 int offset = getOffsetForName0(name); 221 if (offset == -1) { 222 throw new RuntimeException(name + " not found"); 223 } 224 return offset; 225 } 226 227 }