WhiteBox.java revision 1635:da355bc6d1f9
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; 35import java.util.Objects; 36 37import sun.hotspot.parser.DiagnosticCommand; 38 39public class WhiteBox { 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 private native long getObjectAddress0(Object o); 78 public long getObjectAddress(Object o) { 79 Objects.requireNonNull(o); 80 return getObjectAddress0(o); 81 } 82 83 public native int getHeapOopSize(); 84 public native int getVMPageSize(); 85 public native long getVMAllocationGranularity(); 86 public native long getVMLargePageSize(); 87 88 private native boolean isObjectInOldGen0(Object o); 89 public boolean isObjectInOldGen(Object o) { 90 Objects.requireNonNull(o); 91 return isObjectInOldGen0(o); 92 } 93 94 private native long getObjectSize0(Object o); 95 public long getObjectSize(Object o) { 96 Objects.requireNonNull(o); 97 return getObjectSize0(o); 98 } 99 100 // Runtime 101 // Make sure class name is in the correct format 102 public boolean isClassAlive(String name) { 103 return isClassAlive0(name.replace('.', '/')); 104 } 105 private native boolean isClassAlive0(String name); 106 107 private native boolean isMonitorInflated0(Object obj); 108 public boolean isMonitorInflated(Object obj) { 109 Objects.requireNonNull(obj); 110 return isMonitorInflated0(obj); 111 } 112 113 public native void forceSafepoint(); 114 115 // JVMTI 116 private native void addToBootstrapClassLoaderSearch0(String segment); 117 public void addToBootstrapClassLoaderSearch(String segment){ 118 Objects.requireNonNull(segment); 119 addToBootstrapClassLoaderSearch0(segment); 120 } 121 122 private native void addToSystemClassLoaderSearch0(String segment); 123 public void addToSystemClassLoaderSearch(String segment) { 124 Objects.requireNonNull(segment); 125 addToSystemClassLoaderSearch0(segment); 126 } 127 128 // G1 129 public native boolean g1InConcurrentMark(); 130 private native boolean g1IsHumongous0(Object o); 131 public boolean g1IsHumongous(Object o) { 132 Objects.requireNonNull(o); 133 return g1IsHumongous0(o); 134 } 135 136 public native long g1NumMaxRegions(); 137 public native long g1NumFreeRegions(); 138 public native int g1RegionSize(); 139 public native MemoryUsage g1AuxiliaryMemoryUsage(); 140 private native Object[] parseCommandLine0(String commandline, char delim, DiagnosticCommand[] args); 141 public Object[] parseCommandLine(String commandline, char delim, DiagnosticCommand[] args) { 142 Objects.requireNonNull(args); 143 return parseCommandLine0(commandline, delim, args); 144 } 145 146 // NMT 147 public native long NMTMalloc(long size); 148 public native void NMTFree(long mem); 149 public native long NMTReserveMemory(long size); 150 public native void NMTCommitMemory(long addr, long size); 151 public native void NMTUncommitMemory(long addr, long size); 152 public native void NMTReleaseMemory(long addr, long size); 153 public native long NMTMallocWithPseudoStack(long size, int index); 154 public native boolean NMTChangeTrackingLevel(); 155 public native int NMTGetHashSize(); 156 157 // Compiler 158 public native int deoptimizeFrames(boolean makeNotEntrant); 159 public native void deoptimizeAll(); 160 public boolean isMethodCompiled(Executable method) { 161 return isMethodCompiled(method, false /*not osr*/); 162 } 163 private native boolean isMethodCompiled0(Executable method, boolean isOsr); 164 public boolean isMethodCompiled(Executable method, boolean isOsr){ 165 Objects.requireNonNull(method); 166 return isMethodCompiled0(method, isOsr); 167 } 168 public boolean isMethodCompilable(Executable method) { 169 return isMethodCompilable(method, -1 /*any*/); 170 } 171 public boolean isMethodCompilable(Executable method, int compLevel) { 172 return isMethodCompilable(method, compLevel, false /*not osr*/); 173 } 174 private native boolean isMethodCompilable0(Executable method, int compLevel, boolean isOsr); 175 public boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr) { 176 Objects.requireNonNull(method); 177 return isMethodCompilable0(method, compLevel, isOsr); 178 } 179 private native boolean isMethodQueuedForCompilation0(Executable method); 180 public boolean isMethodQueuedForCompilation(Executable method) { 181 Objects.requireNonNull(method); 182 return isMethodQueuedForCompilation0(method); 183 } 184 // Determine if the compiler corresponding to the compilation level 'compLevel' 185 // and to the compilation context 'compilation_context' provides an intrinsic 186 // for the method 'method'. An intrinsic is available for method 'method' if: 187 // - the intrinsic is enabled (by using the appropriate command-line flag) and 188 // - the platform on which the VM is running provides the instructions necessary 189 // for the compiler to generate the intrinsic code. 190 // 191 // The compilation context is related to using the DisableIntrinsic flag on a 192 // per-method level, see hotspot/src/share/vm/compiler/abstractCompiler.hpp 193 // for more details. 194 public boolean isIntrinsicAvailable(Executable method, 195 Executable compilationContext, 196 int compLevel) { 197 Objects.requireNonNull(method); 198 return isIntrinsicAvailable0(method, compilationContext, compLevel); 199 } 200 // If usage of the DisableIntrinsic flag is not expected (or the usage can be ignored), 201 // use the below method that does not require the compilation context as argument. 202 public boolean isIntrinsicAvailable(Executable method, int compLevel) { 203 return isIntrinsicAvailable(method, null, compLevel); 204 } 205 private native boolean isIntrinsicAvailable0(Executable method, 206 Executable compilationContext, 207 int compLevel); 208 public int deoptimizeMethod(Executable method) { 209 return deoptimizeMethod(method, false /*not osr*/); 210 } 211 private native int deoptimizeMethod0(Executable method, boolean isOsr); 212 public int deoptimizeMethod(Executable method, boolean isOsr) { 213 Objects.requireNonNull(method); 214 return deoptimizeMethod0(method, isOsr); 215 } 216 public void makeMethodNotCompilable(Executable method) { 217 makeMethodNotCompilable(method, -1 /*any*/); 218 } 219 public void makeMethodNotCompilable(Executable method, int compLevel) { 220 makeMethodNotCompilable(method, compLevel, false /*not osr*/); 221 } 222 private native void makeMethodNotCompilable0(Executable method, int compLevel, boolean isOsr); 223 public void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr) { 224 Objects.requireNonNull(method); 225 makeMethodNotCompilable0(method, compLevel, isOsr); 226 } 227 public int getMethodCompilationLevel(Executable method) { 228 return getMethodCompilationLevel(method, false /*not ost*/); 229 } 230 private native int getMethodCompilationLevel0(Executable method, boolean isOsr); 231 public int getMethodCompilationLevel(Executable method, boolean isOsr) { 232 Objects.requireNonNull(method); 233 return getMethodCompilationLevel0(method, isOsr); 234 } 235 private native boolean testSetDontInlineMethod0(Executable method, boolean value); 236 public boolean testSetDontInlineMethod(Executable method, boolean value) { 237 Objects.requireNonNull(method); 238 return testSetDontInlineMethod0(method, value); 239 } 240 public int getCompileQueuesSize() { 241 return getCompileQueueSize(-1 /*any*/); 242 } 243 public native int getCompileQueueSize(int compLevel); 244 private native boolean testSetForceInlineMethod0(Executable method, boolean value); 245 public boolean testSetForceInlineMethod(Executable method, boolean value) { 246 Objects.requireNonNull(method); 247 return testSetForceInlineMethod0(method, value); 248 } 249 public boolean enqueueMethodForCompilation(Executable method, int compLevel) { 250 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); 251 } 252 private native boolean enqueueMethodForCompilation0(Executable method, int compLevel, int entry_bci); 253 public boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci) { 254 Objects.requireNonNull(method); 255 return enqueueMethodForCompilation0(method, compLevel, entry_bci); 256 } 257 private native void clearMethodState0(Executable method); 258 public void clearMethodState(Executable method) { 259 Objects.requireNonNull(method); 260 clearMethodState0(method); 261 } 262 public native void lockCompilation(); 263 public native void unlockCompilation(); 264 private native int getMethodEntryBci0(Executable method); 265 public int getMethodEntryBci(Executable method) { 266 Objects.requireNonNull(method); 267 return getMethodEntryBci0(method); 268 } 269 private native Object[] getNMethod0(Executable method, boolean isOsr); 270 public Object[] getNMethod(Executable method, boolean isOsr) { 271 Objects.requireNonNull(method); 272 return getNMethod0(method, isOsr); 273 } 274 public native long allocateCodeBlob(int size, int type); 275 public long allocateCodeBlob(long size, int type) { 276 int intSize = (int) size; 277 if ((long) intSize != size || size < 0) { 278 throw new IllegalArgumentException( 279 "size argument has illegal value " + size); 280 } 281 return allocateCodeBlob( intSize, type); 282 } 283 public native void freeCodeBlob(long addr); 284 public native void forceNMethodSweep(); 285 public native Object[] getCodeHeapEntries(int type); 286 public native int getCompilationActivityMode(); 287 public native Object[] getCodeBlob(long addr); 288 289 // Intered strings 290 public native boolean isInStringTable(String str); 291 292 // Memory 293 public native void readReservedMemory(); 294 public native long allocateMetaspace(ClassLoader classLoader, long size); 295 public native void freeMetaspace(ClassLoader classLoader, long addr, long size); 296 public native long incMetaspaceCapacityUntilGC(long increment); 297 public native long metaspaceCapacityUntilGC(); 298 299 // Force Young GC 300 public native void youngGC(); 301 302 // Force Full GC 303 public native void fullGC(); 304 305 // Method tries to start concurrent mark cycle. 306 // It returns false if CM Thread is always in concurrent cycle. 307 public native boolean g1StartConcMarkCycle(); 308 309 // Tests on ReservedSpace/VirtualSpace classes 310 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); 311 public native void runMemoryUnitTests(); 312 public native void readFromNoaccessArea(); 313 public native long getThreadStackSize(); 314 public native long getThreadRemainingStackSize(); 315 316 // CPU features 317 public native String getCPUFeatures(); 318 319 // Native extensions 320 public native long getHeapUsageForContext(int context); 321 public native long getHeapRegionCountForContext(int context); 322 private native int getContextForObject0(Object obj); 323 public int getContextForObject(Object obj) { 324 Objects.requireNonNull(obj); 325 return getContextForObject0(obj); 326 } 327 public native void printRegionInfo(int context); 328 329 // VM flags 330 public native boolean isConstantVMFlag(String name); 331 public native boolean isLockedVMFlag(String name); 332 public native void setBooleanVMFlag(String name, boolean value); 333 public native void setIntVMFlag(String name, long value); 334 public native void setUintVMFlag(String name, long value); 335 public native void setIntxVMFlag(String name, long value); 336 public native void setUintxVMFlag(String name, long value); 337 public native void setUint64VMFlag(String name, long value); 338 public native void setSizeTVMFlag(String name, long value); 339 public native void setStringVMFlag(String name, String value); 340 public native void setDoubleVMFlag(String name, double value); 341 public native Boolean getBooleanVMFlag(String name); 342 public native Long getIntVMFlag(String name); 343 public native Long getUintVMFlag(String name); 344 public native Long getIntxVMFlag(String name); 345 public native Long getUintxVMFlag(String name); 346 public native Long getUint64VMFlag(String name); 347 public native Long getSizeTVMFlag(String name); 348 public native String getStringVMFlag(String name); 349 public native Double getDoubleVMFlag(String name); 350 private final List<Function<String,Object>> flagsGetters = Arrays.asList( 351 this::getBooleanVMFlag, this::getIntVMFlag, this::getUintVMFlag, 352 this::getIntxVMFlag, this::getUintxVMFlag, this::getUint64VMFlag, 353 this::getSizeTVMFlag, this::getStringVMFlag, this::getDoubleVMFlag); 354 355 public Object getVMFlag(String name) { 356 return flagsGetters.stream() 357 .map(f -> f.apply(name)) 358 .filter(x -> x != null) 359 .findAny() 360 .orElse(null); 361 } 362 public native int getOffsetForName0(String name); 363 public int getOffsetForName(String name) throws Exception { 364 int offset = getOffsetForName0(name); 365 if (offset == -1) { 366 throw new RuntimeException(name + " not found"); 367 } 368 return offset; 369 } 370 public native Boolean getMethodBooleanOption(Executable method, String name); 371 public native Long getMethodIntxOption(Executable method, String name); 372 public native Long getMethodUintxOption(Executable method, String name); 373 public native Double getMethodDoubleOption(Executable method, String name); 374 public native String getMethodStringOption(Executable method, String name); 375 private final List<BiFunction<Executable,String,Object>> methodOptionGetters 376 = Arrays.asList(this::getMethodBooleanOption, this::getMethodIntxOption, 377 this::getMethodUintxOption, this::getMethodDoubleOption, 378 this::getMethodStringOption); 379 380 public Object getMethodOption(Executable method, String name) { 381 return methodOptionGetters.stream() 382 .map(f -> f.apply(method, name)) 383 .filter(x -> x != null) 384 .findAny() 385 .orElse(null); 386 } 387 388 // Safepoint Checking 389 public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue); 390 391 // Sharing 392 public native boolean isShared(Object o); 393 public native boolean areSharedStringsIgnored(); 394} 395