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 25 package sun.hotspot; 26 27 import java.lang.management.MemoryUsage; 28 import java.lang.reflect.Executable; 29 import java.util.Arrays; 30 import java.util.List; 31 import java.util.function.BiFunction; 32 import java.util.function.Function; 33 import java.security.BasicPermission; 34 import java.util.Objects; 35 import jdk.internal.HotSpotIntrinsicCandidate; 36 37 import sun.hotspot.parser.DiagnosticCommand; 38 39 public 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 public native long getHeapSpaceAlignment(); 88 89 private native boolean isObjectInOldGen0(Object o); 90 public boolean isObjectInOldGen(Object o) { 91 Objects.requireNonNull(o); 92 return isObjectInOldGen0(o); 93 } 94 95 private native long getObjectSize0(Object o); 96 public long getObjectSize(Object o) { 97 Objects.requireNonNull(o); 98 return getObjectSize0(o); 99 } 100 101 // Runtime 102 // Make sure class name is in the correct format 103 public boolean isClassAlive(String name) { 104 return isClassAlive0(name.replace('.', '/')); 105 } 106 private native boolean isClassAlive0(String name); 107 108 private native boolean isMonitorInflated0(Object obj); 109 public boolean isMonitorInflated(Object obj) { 110 Objects.requireNonNull(obj); 111 return isMonitorInflated0(obj); 112 } 113 114 public native void forceSafepoint(); 115 116 private native long getConstantPool0(Class<?> aClass); 117 public long getConstantPool(Class<?> aClass) { 118 Objects.requireNonNull(aClass); 119 return getConstantPool0(aClass); 120 } 121 122 private native int getConstantPoolCacheIndexTag0(); 123 public int getConstantPoolCacheIndexTag() { 124 return getConstantPoolCacheIndexTag0(); 125 } 126 127 private native int getConstantPoolCacheLength0(Class<?> aClass); 128 public int getConstantPoolCacheLength(Class<?> aClass) { 129 Objects.requireNonNull(aClass); 130 return getConstantPoolCacheLength0(aClass); 131 } 132 133 private native int remapInstructionOperandFromCPCache0(Class<?> aClass, int index); 134 public int remapInstructionOperandFromCPCache(Class<?> aClass, int index) { 135 Objects.requireNonNull(aClass); 136 return remapInstructionOperandFromCPCache0(aClass, index); 137 } 138 139 private native int encodeConstantPoolIndyIndex0(int index); 140 public int encodeConstantPoolIndyIndex(int index) { 141 return encodeConstantPoolIndyIndex0(index); 142 } 143 144 // JVMTI 145 private native void addToBootstrapClassLoaderSearch0(String segment); 146 public void addToBootstrapClassLoaderSearch(String segment){ 147 Objects.requireNonNull(segment); 148 addToBootstrapClassLoaderSearch0(segment); 149 } 150 151 private native void addToSystemClassLoaderSearch0(String segment); 152 public void addToSystemClassLoaderSearch(String segment) { 153 Objects.requireNonNull(segment); 154 addToSystemClassLoaderSearch0(segment); 155 } 156 157 // G1 158 public native boolean g1InConcurrentMark(); 159 private native boolean g1IsHumongous0(Object o); 160 public boolean g1IsHumongous(Object o) { 161 Objects.requireNonNull(o); 162 return g1IsHumongous0(o); 163 } 164 165 private native boolean g1BelongsToHumongousRegion0(long adr); 166 public boolean g1BelongsToHumongousRegion(long adr) { 167 if (adr == 0) { 168 throw new IllegalArgumentException("adr argument should not be null"); 169 } 170 return g1BelongsToHumongousRegion0(adr); 171 } 172 173 174 private native boolean g1BelongsToFreeRegion0(long adr); 175 public boolean g1BelongsToFreeRegion(long adr) { 176 if (adr == 0) { 177 throw new IllegalArgumentException("adr argument should not be null"); 178 } 179 return g1BelongsToFreeRegion0(adr); 180 } 181 182 public native long g1NumMaxRegions(); 183 public native long g1NumFreeRegions(); 184 public native int g1RegionSize(); 185 public native MemoryUsage g1AuxiliaryMemoryUsage(); 186 private native Object[] parseCommandLine0(String commandline, char delim, DiagnosticCommand[] args); 187 public Object[] parseCommandLine(String commandline, char delim, DiagnosticCommand[] args) { 188 Objects.requireNonNull(args); 189 return parseCommandLine0(commandline, delim, args); 190 } 191 192 // Parallel GC 193 public native long psVirtualSpaceAlignment(); 194 public native long psHeapGenerationAlignment(); 195 196 // NMT 197 public native long NMTMalloc(long size); 198 public native void NMTFree(long mem); 199 public native long NMTReserveMemory(long size); 200 public native void NMTCommitMemory(long addr, long size); 201 public native void NMTUncommitMemory(long addr, long size); 202 public native void NMTReleaseMemory(long addr, long size); 203 public native long NMTMallocWithPseudoStack(long size, int index); 204 public native boolean NMTChangeTrackingLevel(); 205 public native int NMTGetHashSize(); 206 207 // Compiler 208 public native int matchesMethod(Executable method, String pattern); 209 public native int matchesInline(Executable method, String pattern); 210 public native boolean shouldPrintAssembly(Executable method, int comp_level); 211 public native int deoptimizeFrames(boolean makeNotEntrant); 212 public native void deoptimizeAll(); 213 214 @HotSpotIntrinsicCandidate 215 public void deoptimize() {} 216 public boolean isMethodCompiled(Executable method) { 217 return isMethodCompiled(method, false /*not osr*/); 218 } 219 private native boolean isMethodCompiled0(Executable method, boolean isOsr); 220 public boolean isMethodCompiled(Executable method, boolean isOsr){ 221 Objects.requireNonNull(method); 222 return isMethodCompiled0(method, isOsr); 223 } 224 public boolean isMethodCompilable(Executable method) { 225 return isMethodCompilable(method, -1 /*any*/); 226 } 227 public boolean isMethodCompilable(Executable method, int compLevel) { 228 return isMethodCompilable(method, compLevel, false /*not osr*/); 229 } 230 private native boolean isMethodCompilable0(Executable method, int compLevel, boolean isOsr); 231 public boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr) { 232 Objects.requireNonNull(method); 233 return isMethodCompilable0(method, compLevel, isOsr); 234 } 235 private native boolean isMethodQueuedForCompilation0(Executable method); 236 public boolean isMethodQueuedForCompilation(Executable method) { 237 Objects.requireNonNull(method); 238 return isMethodQueuedForCompilation0(method); 239 } 240 // Determine if the compiler corresponding to the compilation level 'compLevel' 241 // and to the compilation context 'compilation_context' provides an intrinsic 242 // for the method 'method'. An intrinsic is available for method 'method' if: 243 // - the intrinsic is enabled (by using the appropriate command-line flag) and 244 // - the platform on which the VM is running provides the instructions necessary 245 // for the compiler to generate the intrinsic code. 246 // 247 // The compilation context is related to using the DisableIntrinsic flag on a 248 // per-method level, see hotspot/src/share/vm/compiler/abstractCompiler.hpp 249 // for more details. 250 public boolean isIntrinsicAvailable(Executable method, 251 Executable compilationContext, 252 int compLevel) { 253 Objects.requireNonNull(method); 254 return isIntrinsicAvailable0(method, compilationContext, compLevel); 255 } 256 // If usage of the DisableIntrinsic flag is not expected (or the usage can be ignored), 257 // use the below method that does not require the compilation context as argument. 258 public boolean isIntrinsicAvailable(Executable method, int compLevel) { 259 return isIntrinsicAvailable(method, null, compLevel); 260 } 261 private native boolean isIntrinsicAvailable0(Executable method, 262 Executable compilationContext, 263 int compLevel); 264 public int deoptimizeMethod(Executable method) { 265 return deoptimizeMethod(method, false /*not osr*/); 266 } 267 private native int deoptimizeMethod0(Executable method, boolean isOsr); 268 public int deoptimizeMethod(Executable method, boolean isOsr) { 269 Objects.requireNonNull(method); 270 return deoptimizeMethod0(method, isOsr); 271 } 272 public void makeMethodNotCompilable(Executable method) { 273 makeMethodNotCompilable(method, -1 /*any*/); 274 } 275 public void makeMethodNotCompilable(Executable method, int compLevel) { 276 makeMethodNotCompilable(method, compLevel, false /*not osr*/); 277 } 278 private native void makeMethodNotCompilable0(Executable method, int compLevel, boolean isOsr); 279 public void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr) { 280 Objects.requireNonNull(method); 281 makeMethodNotCompilable0(method, compLevel, isOsr); 282 } 283 public int getMethodCompilationLevel(Executable method) { 284 return getMethodCompilationLevel(method, false /*not ost*/); 285 } 286 private native int getMethodCompilationLevel0(Executable method, boolean isOsr); 287 public int getMethodCompilationLevel(Executable method, boolean isOsr) { 288 Objects.requireNonNull(method); 289 return getMethodCompilationLevel0(method, isOsr); 290 } 291 private native boolean testSetDontInlineMethod0(Executable method, boolean value); 292 public boolean testSetDontInlineMethod(Executable method, boolean value) { 293 Objects.requireNonNull(method); 294 return testSetDontInlineMethod0(method, value); 295 } 296 public int getCompileQueuesSize() { 297 return getCompileQueueSize(-1 /*any*/); 298 } 299 public native int getCompileQueueSize(int compLevel); 300 private native boolean testSetForceInlineMethod0(Executable method, boolean value); 301 public boolean testSetForceInlineMethod(Executable method, boolean value) { 302 Objects.requireNonNull(method); 303 return testSetForceInlineMethod0(method, value); 304 } 305 public boolean enqueueMethodForCompilation(Executable method, int compLevel) { 306 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); 307 } 308 private native boolean enqueueMethodForCompilation0(Executable method, int compLevel, int entry_bci); 309 public boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci) { 310 Objects.requireNonNull(method); 311 return enqueueMethodForCompilation0(method, compLevel, entry_bci); 312 } 313 private native void clearMethodState0(Executable method); 314 public void clearMethodState(Executable method) { 315 Objects.requireNonNull(method); 316 clearMethodState0(method); 317 } 318 public native void lockCompilation(); 319 public native void unlockCompilation(); 320 private native int getMethodEntryBci0(Executable method); 321 public int getMethodEntryBci(Executable method) { 322 Objects.requireNonNull(method); 323 return getMethodEntryBci0(method); 324 } 325 private native Object[] getNMethod0(Executable method, boolean isOsr); 326 public Object[] getNMethod(Executable method, boolean isOsr) { 327 Objects.requireNonNull(method); 328 return getNMethod0(method, isOsr); 329 } 330 public native long allocateCodeBlob(int size, int type); 331 public long allocateCodeBlob(long size, int type) { 332 int intSize = (int) size; 333 if ((long) intSize != size || size < 0) { 334 throw new IllegalArgumentException( 335 "size argument has illegal value " + size); 336 } 337 return allocateCodeBlob( intSize, type); 338 } 339 public native void freeCodeBlob(long addr); 340 public native void forceNMethodSweep(); 341 public native Object[] getCodeHeapEntries(int type); 342 public native int getCompilationActivityMode(); 343 private native long getMethodData0(Executable method); 344 public long getMethodData(Executable method) { 345 Objects.requireNonNull(method); 346 return getMethodData0(method); 347 } 348 public native Object[] getCodeBlob(long addr); 349 350 public native void clearInlineCaches(); 351 352 // Intered strings 353 public native boolean isInStringTable(String str); 354 355 // Memory 356 public native void readReservedMemory(); 357 public native long allocateMetaspace(ClassLoader classLoader, long size); 358 public native void freeMetaspace(ClassLoader classLoader, long addr, long size); 359 public native long incMetaspaceCapacityUntilGC(long increment); 360 public native long metaspaceCapacityUntilGC(); 361 362 // Force Young GC 363 public native void youngGC(); 364 365 // Force Full GC 366 public native void fullGC(); 367 368 // Method tries to start concurrent mark cycle. 369 // It returns false if CM Thread is always in concurrent cycle. 370 public native boolean g1StartConcMarkCycle(); 371 372 // Tests on ReservedSpace/VirtualSpace classes 373 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); 374 public native void runMemoryUnitTests(); 375 public native void readFromNoaccessArea(); 376 public native long getThreadStackSize(); 377 public native long getThreadRemainingStackSize(); 378 379 // CPU features 380 public native String getCPUFeatures(); 381 382 // Native extensions 383 public native long getHeapUsageForContext(int context); 384 public native long getHeapRegionCountForContext(int context); 385 private native int getContextForObject0(Object obj); 386 public int getContextForObject(Object obj) { 387 Objects.requireNonNull(obj); 388 return getContextForObject0(obj); 389 } 390 public native void printRegionInfo(int context); 391 392 // VM flags 393 public native boolean isConstantVMFlag(String name); 394 public native boolean isLockedVMFlag(String name); 395 public native void setBooleanVMFlag(String name, boolean value); 396 public native void setIntVMFlag(String name, long value); 397 public native void setUintVMFlag(String name, long value); 398 public native void setIntxVMFlag(String name, long value); 399 public native void setUintxVMFlag(String name, long value); 400 public native void setUint64VMFlag(String name, long value); 401 public native void setSizeTVMFlag(String name, long value); 402 public native void setStringVMFlag(String name, String value); 403 public native void setDoubleVMFlag(String name, double value); 404 public native Boolean getBooleanVMFlag(String name); 405 public native Long getIntVMFlag(String name); 406 public native Long getUintVMFlag(String name); 407 public native Long getIntxVMFlag(String name); 408 public native Long getUintxVMFlag(String name); 409 public native Long getUint64VMFlag(String name); 410 public native Long getSizeTVMFlag(String name); 411 public native String getStringVMFlag(String name); 412 public native Double getDoubleVMFlag(String name); 413 private final List<Function<String,Object>> flagsGetters = Arrays.asList( 414 this::getBooleanVMFlag, this::getIntVMFlag, this::getUintVMFlag, 415 this::getIntxVMFlag, this::getUintxVMFlag, this::getUint64VMFlag, 416 this::getSizeTVMFlag, this::getStringVMFlag, this::getDoubleVMFlag); 417 418 public Object getVMFlag(String name) { 419 return flagsGetters.stream() 420 .map(f -> f.apply(name)) 421 .filter(x -> x != null) 422 .findAny() 423 .orElse(null); 424 } 425 public native int getOffsetForName0(String name); 426 public int getOffsetForName(String name) throws Exception { 427 int offset = getOffsetForName0(name); 428 if (offset == -1) { 429 throw new RuntimeException(name + " not found"); 430 } 431 return offset; 432 } 433 public native Boolean getMethodBooleanOption(Executable method, String name); 434 public native Long getMethodIntxOption(Executable method, String name); 435 public native Long getMethodUintxOption(Executable method, String name); 436 public native Double getMethodDoubleOption(Executable method, String name); 437 public native String getMethodStringOption(Executable method, String name); 438 private final List<BiFunction<Executable,String,Object>> methodOptionGetters 439 = Arrays.asList(this::getMethodBooleanOption, this::getMethodIntxOption, 440 this::getMethodUintxOption, this::getMethodDoubleOption, 441 this::getMethodStringOption); 442 443 public Object getMethodOption(Executable method, String name) { 444 return methodOptionGetters.stream() 445 .map(f -> f.apply(method, name)) 446 .filter(x -> x != null) 447 .findAny() 448 .orElse(null); 449 } 450 451 // Safepoint Checking 452 public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue); 453 454 // Sharing 455 public native boolean isSharedClass(Class<?> c); 456 public native boolean isShared(Object o); 457 public native boolean areSharedStringsIgnored(); 458 }