WhiteBox.java revision 1413:0a5629c31104
1/* 2 * Copyright (c) 2012, 2015, 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 25package sun.hotspot; 26 27import java.lang.management.MemoryUsage; 28import java.lang.reflect.Executable; 29import java.util.Arrays; 30import java.util.List; 31import java.util.function.BiFunction; 32import java.util.function.Function; 33import java.util.stream.Stream; 34import java.security.BasicPermission; 35 36import sun.hotspot.parser.DiagnosticCommand; 37 38public class WhiteBox { 39 40 @SuppressWarnings("serial") 41 public static class WhiteBoxPermission extends BasicPermission { 42 public WhiteBoxPermission(String s) { 43 super(s); 44 } 45 } 46 47 private WhiteBox() {} 48 private static final WhiteBox instance = new WhiteBox(); 49 private static native void registerNatives(); 50 51 /** 52 * Returns the singleton WhiteBox instance. 53 * 54 * The returned WhiteBox object should be carefully guarded 55 * by the caller, since it can be used to read and write data 56 * at arbitrary memory addresses. It must never be passed to 57 * untrusted code. 58 */ 59 public synchronized static WhiteBox getWhiteBox() { 60 SecurityManager sm = System.getSecurityManager(); 61 if (sm != null) { 62 sm.checkPermission(new WhiteBoxPermission("getInstance")); 63 } 64 return instance; 65 } 66 67 static { 68 registerNatives(); 69 } 70 71 // Get the maximum heap size supporting COOPs 72 public native long getCompressedOopsMaxHeapSize(); 73 // Arguments 74 public native void printHeapSizes(); 75 76 // Memory 77 public native long getObjectAddress(Object o); 78 public native int getHeapOopSize(); 79 public native int getVMPageSize(); 80 public native boolean isObjectInOldGen(Object o); 81 public native long getObjectSize(Object o); 82 83 // Runtime 84 // Make sure class name is in the correct format 85 public boolean isClassAlive(String name) { 86 return isClassAlive0(name.replace('.', '/')); 87 } 88 private native boolean isClassAlive0(String name); 89 public native boolean isMonitorInflated(Object obj); 90 public native void forceSafepoint(); 91 92 // JVMTI 93 public native void addToBootstrapClassLoaderSearch(String segment); 94 public native void addToSystemClassLoaderSearch(String segment); 95 96 // G1 97 public native boolean g1InConcurrentMark(); 98 public native boolean g1IsHumongous(Object o); 99 public native long g1NumMaxRegions(); 100 public native long g1NumFreeRegions(); 101 public native int g1RegionSize(); 102 public native MemoryUsage g1AuxiliaryMemoryUsage(); 103 public native Object[] parseCommandLine(String commandline, char delim, DiagnosticCommand[] args); 104 105 // NMT 106 public native long NMTMalloc(long size); 107 public native void NMTFree(long mem); 108 public native long NMTReserveMemory(long size); 109 public native void NMTCommitMemory(long addr, long size); 110 public native void NMTUncommitMemory(long addr, long size); 111 public native void NMTReleaseMemory(long addr, long size); 112 public native long NMTMallocWithPseudoStack(long size, int index); 113 public native boolean NMTIsDetailSupported(); 114 public native boolean NMTChangeTrackingLevel(); 115 public native int NMTGetHashSize(); 116 117 // Compiler 118 public native int deoptimizeFrames(boolean makeNotEntrant); 119 public native void deoptimizeAll(); 120 public boolean isMethodCompiled(Executable method) { 121 return isMethodCompiled(method, false /*not osr*/); 122 } 123 public native boolean isMethodCompiled(Executable method, boolean isOsr); 124 public boolean isMethodCompilable(Executable method) { 125 return isMethodCompilable(method, -1 /*any*/); 126 } 127 public boolean isMethodCompilable(Executable method, int compLevel) { 128 return isMethodCompilable(method, compLevel, false /*not osr*/); 129 } 130 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr); 131 public native boolean isMethodQueuedForCompilation(Executable method); 132 public int deoptimizeMethod(Executable method) { 133 return deoptimizeMethod(method, false /*not osr*/); 134 } 135 public native int deoptimizeMethod(Executable method, boolean isOsr); 136 public void makeMethodNotCompilable(Executable method) { 137 makeMethodNotCompilable(method, -1 /*any*/); 138 } 139 public void makeMethodNotCompilable(Executable method, int compLevel) { 140 makeMethodNotCompilable(method, compLevel, false /*not osr*/); 141 } 142 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr); 143 public int getMethodCompilationLevel(Executable method) { 144 return getMethodCompilationLevel(method, false /*not ost*/); 145 } 146 public native int getMethodCompilationLevel(Executable method, boolean isOsr); 147 public native boolean testSetDontInlineMethod(Executable method, boolean value); 148 public int getCompileQueuesSize() { 149 return getCompileQueueSize(-1 /*any*/); 150 } 151 public native int getCompileQueueSize(int compLevel); 152 public native boolean testSetForceInlineMethod(Executable method, boolean value); 153 public boolean enqueueMethodForCompilation(Executable method, int compLevel) { 154 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); 155 } 156 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci); 157 public native void clearMethodState(Executable method); 158 public native void lockCompilation(); 159 public native void unlockCompilation(); 160 public native int getMethodEntryBci(Executable method); 161 public native Object[] getNMethod(Executable method, boolean isOsr); 162 public native long allocateCodeBlob(int size, int type); 163 public long allocateCodeBlob(long size, int type) { 164 int intSize = (int) size; 165 if ((long) intSize != size || size < 0) { 166 throw new IllegalArgumentException( 167 "size argument has illegal value " + size); 168 } 169 return allocateCodeBlob( intSize, type); 170 } 171 public native void freeCodeBlob(long addr); 172 public void forceNMethodSweep() { 173 try { 174 forceNMethodSweep0().join(); 175 } catch (InterruptedException e) { 176 Thread.currentThread().interrupt(); 177 } 178 } 179 public native Thread forceNMethodSweep0(); 180 public native Object[] getCodeHeapEntries(int type); 181 public native int getCompilationActivityMode(); 182 public native Object[] getCodeBlob(long addr); 183 184 // Intered strings 185 public native boolean isInStringTable(String str); 186 187 // Memory 188 public native void readReservedMemory(); 189 public native long allocateMetaspace(ClassLoader classLoader, long size); 190 public native void freeMetaspace(ClassLoader classLoader, long addr, long size); 191 public native long incMetaspaceCapacityUntilGC(long increment); 192 public native long metaspaceCapacityUntilGC(); 193 194 // Force Young GC 195 public native void youngGC(); 196 197 // Force Full GC 198 public native void fullGC(); 199 200 // Method tries to start concurrent mark cycle. 201 // It returns false if CM Thread is always in concurrent cycle. 202 public native boolean g1StartConcMarkCycle(); 203 204 // Tests on ReservedSpace/VirtualSpace classes 205 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); 206 public native void runMemoryUnitTests(); 207 public native void readFromNoaccessArea(); 208 public native long getThreadStackSize(); 209 public native long getThreadRemainingStackSize(); 210 211 // CPU features 212 public native String getCPUFeatures(); 213 214 // Native extensions 215 public native long getHeapUsageForContext(int context); 216 public native long getHeapRegionCountForContext(int context); 217 public native int getContextForObject(Object obj); 218 public native void printRegionInfo(int context); 219 220 // VM flags 221 public native boolean isConstantVMFlag(String name); 222 public native boolean isLockedVMFlag(String name); 223 public native void setBooleanVMFlag(String name, boolean value); 224 public native void setIntxVMFlag(String name, long value); 225 public native void setUintxVMFlag(String name, long value); 226 public native void setUint64VMFlag(String name, long value); 227 public native void setSizeTVMFlag(String name, long value); 228 public native void setStringVMFlag(String name, String value); 229 public native void setDoubleVMFlag(String name, double value); 230 public native Boolean getBooleanVMFlag(String name); 231 public native Long getIntxVMFlag(String name); 232 public native Long getUintxVMFlag(String name); 233 public native Long getUint64VMFlag(String name); 234 public native Long getSizeTVMFlag(String name); 235 public native String getStringVMFlag(String name); 236 public native Double getDoubleVMFlag(String name); 237 private final List<Function<String,Object>> flagsGetters = Arrays.asList( 238 this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag, 239 this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag, 240 this::getDoubleVMFlag); 241 242 public Object getVMFlag(String name) { 243 return flagsGetters.stream() 244 .map(f -> f.apply(name)) 245 .filter(x -> x != null) 246 .findAny() 247 .orElse(null); 248 } 249 public native int getOffsetForName0(String name); 250 public int getOffsetForName(String name) throws Exception { 251 int offset = getOffsetForName0(name); 252 if (offset == -1) { 253 throw new RuntimeException(name + " not found"); 254 } 255 return offset; 256 } 257 public native Boolean getMethodBooleanOption(Executable method, String name); 258 public native Long getMethodIntxOption(Executable method, String name); 259 public native Long getMethodUintxOption(Executable method, String name); 260 public native Double getMethodDoubleOption(Executable method, String name); 261 public native String getMethodStringOption(Executable method, String name); 262 private final List<BiFunction<Executable,String,Object>> methodOptionGetters 263 = Arrays.asList(this::getMethodBooleanOption, this::getMethodIntxOption, 264 this::getMethodUintxOption, this::getMethodDoubleOption, 265 this::getMethodStringOption); 266 267 public Object getMethodOption(Executable method, String name) { 268 return methodOptionGetters.stream() 269 .map(f -> f.apply(method, name)) 270 .filter(x -> x != null) 271 .findAny() 272 .orElse(null); 273 } 274 275 // Safepoint Checking 276 public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue); 277} 278