1 /* 2 * Copyright (c) 2012, 2019, 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 package sun.hotspot; 25 26 import java.lang.management.MemoryUsage; 27 import java.lang.reflect.Executable; 28 import java.util.Arrays; 29 import java.util.List; 30 import java.util.function.BiFunction; 31 import java.util.function.Function; 32 import java.security.BasicPermission; 33 import java.util.Objects; 34 35 import sun.hotspot.parser.DiagnosticCommand; 36 37 public class WhiteBox { 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 private native long getObjectAddress0(Object o); 76 public long getObjectAddress(Object o) { 77 Objects.requireNonNull(o); 78 return getObjectAddress0(o); 79 } 80 81 public native int getHeapOopSize(); 82 public native int getVMPageSize(); 83 public native long getVMAllocationGranularity(); 84 public native long getVMLargePageSize(); 85 public native long getHeapSpaceAlignment(); 86 public native long getHeapAlignment(); 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 public native int getSymbolRefcount(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 long dramReservedStart(); 186 public native long dramReservedEnd(); 187 public native long nvdimmReservedStart(); 188 public native long nvdimmReservedEnd(); 189 public native MemoryUsage g1AuxiliaryMemoryUsage(); 190 private native Object[] parseCommandLine0(String commandline, char delim, DiagnosticCommand[] args); 191 public Object[] parseCommandLine(String commandline, char delim, DiagnosticCommand[] args) { 192 Objects.requireNonNull(args); 193 return parseCommandLine0(commandline, delim, args); 194 } 195 196 // Parallel GC 197 public native long psVirtualSpaceAlignment(); 198 public native long psHeapGenerationAlignment(); 199 200 /** 201 * Enumerates old regions with liveness less than specified and produces some statistics 202 * @param liveness percent of region's liveness (live_objects / total_region_size * 100). 203 * @return long[3] array where long[0] - total count of old regions 204 * long[1] - total memory of old regions 205 * long[2] - lowest estimation of total memory of old regions to be freed (non-full 206 * regions are not included) 207 */ 208 public native long[] g1GetMixedGCInfo(int liveness); 209 210 // NMT 211 public native long NMTMalloc(long size); 212 public native void NMTFree(long mem); 213 public native long NMTReserveMemory(long size); 214 public native long NMTAttemptReserveMemoryAt(long addr, long size); 215 public native void NMTCommitMemory(long addr, long size); 216 public native void NMTUncommitMemory(long addr, long size); 217 public native void NMTReleaseMemory(long addr, long size); 218 public native long NMTMallocWithPseudoStack(long size, int index); 219 public native boolean NMTChangeTrackingLevel(); 220 public native int NMTGetHashSize(); 221 222 // Compiler 223 public native int matchesMethod(Executable method, String pattern); 224 public native int matchesInline(Executable method, String pattern); 225 public native boolean shouldPrintAssembly(Executable method, int comp_level); 226 public native int deoptimizeFrames(boolean makeNotEntrant); 227 public native void deoptimizeAll(); 228 229 public boolean isMethodCompiled(Executable method) { 230 return isMethodCompiled(method, false /*not osr*/); 231 } 232 private native boolean isMethodCompiled0(Executable method, boolean isOsr); 233 public boolean isMethodCompiled(Executable method, boolean isOsr){ 234 Objects.requireNonNull(method); 235 return isMethodCompiled0(method, isOsr); 236 } 237 public boolean isMethodCompilable(Executable method) { 238 return isMethodCompilable(method, -2 /*any*/); 239 } 240 public boolean isMethodCompilable(Executable method, int compLevel) { 241 return isMethodCompilable(method, compLevel, false /*not osr*/); 242 } 243 private native boolean isMethodCompilable0(Executable method, int compLevel, boolean isOsr); 244 public boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr) { 245 Objects.requireNonNull(method); 246 return isMethodCompilable0(method, compLevel, isOsr); 247 } 248 private native boolean isMethodQueuedForCompilation0(Executable method); 249 public boolean isMethodQueuedForCompilation(Executable method) { 250 Objects.requireNonNull(method); 251 return isMethodQueuedForCompilation0(method); 252 } 253 // Determine if the compiler corresponding to the compilation level 'compLevel' 254 // and to the compilation context 'compilation_context' provides an intrinsic 255 // for the method 'method'. An intrinsic is available for method 'method' if: 256 // - the intrinsic is enabled (by using the appropriate command-line flag) and 257 // - the platform on which the VM is running provides the instructions necessary 258 // for the compiler to generate the intrinsic code. 259 // 260 // The compilation context is related to using the DisableIntrinsic flag on a 261 // per-method level, see hotspot/src/share/vm/compiler/abstractCompiler.hpp 262 // for more details. 263 public boolean isIntrinsicAvailable(Executable method, 264 Executable compilationContext, 265 int compLevel) { 266 Objects.requireNonNull(method); 267 return isIntrinsicAvailable0(method, compilationContext, compLevel); 268 } 269 // If usage of the DisableIntrinsic flag is not expected (or the usage can be ignored), 270 // use the below method that does not require the compilation context as argument. 271 public boolean isIntrinsicAvailable(Executable method, int compLevel) { 272 return isIntrinsicAvailable(method, null, compLevel); 273 } 274 private native boolean isIntrinsicAvailable0(Executable method, 275 Executable compilationContext, 276 int compLevel); 277 public int deoptimizeMethod(Executable method) { 278 return deoptimizeMethod(method, false /*not osr*/); 279 } 280 private native int deoptimizeMethod0(Executable method, boolean isOsr); 281 public int deoptimizeMethod(Executable method, boolean isOsr) { 282 Objects.requireNonNull(method); 283 return deoptimizeMethod0(method, isOsr); 284 } 285 public void makeMethodNotCompilable(Executable method) { 286 makeMethodNotCompilable(method, -2 /*any*/); 287 } 288 public void makeMethodNotCompilable(Executable method, int compLevel) { 289 makeMethodNotCompilable(method, compLevel, false /*not osr*/); 290 } 291 private native void makeMethodNotCompilable0(Executable method, int compLevel, boolean isOsr); 292 public void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr) { 293 Objects.requireNonNull(method); 294 makeMethodNotCompilable0(method, compLevel, isOsr); 295 } 296 public int getMethodCompilationLevel(Executable method) { 297 return getMethodCompilationLevel(method, false /*not ost*/); 298 } 299 private native int getMethodCompilationLevel0(Executable method, boolean isOsr); 300 public int getMethodCompilationLevel(Executable method, boolean isOsr) { 301 Objects.requireNonNull(method); 302 return getMethodCompilationLevel0(method, isOsr); 303 } 304 private native boolean testSetDontInlineMethod0(Executable method, boolean value); 305 public boolean testSetDontInlineMethod(Executable method, boolean value) { 306 Objects.requireNonNull(method); 307 return testSetDontInlineMethod0(method, value); 308 } 309 public int getCompileQueuesSize() { 310 return getCompileQueueSize(-2 /*any*/); 311 } 312 public native int getCompileQueueSize(int compLevel); 313 private native boolean testSetForceInlineMethod0(Executable method, boolean value); 314 public boolean testSetForceInlineMethod(Executable method, boolean value) { 315 Objects.requireNonNull(method); 316 return testSetForceInlineMethod0(method, value); 317 } 318 public boolean enqueueMethodForCompilation(Executable method, int compLevel) { 319 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); 320 } 321 private native boolean enqueueMethodForCompilation0(Executable method, int compLevel, int entry_bci); 322 public boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci) { 323 Objects.requireNonNull(method); 324 return enqueueMethodForCompilation0(method, compLevel, entry_bci); 325 } 326 private native boolean enqueueInitializerForCompilation0(Class<?> aClass, int compLevel); 327 public boolean enqueueInitializerForCompilation(Class<?> aClass, int compLevel) { 328 Objects.requireNonNull(aClass); 329 return enqueueInitializerForCompilation0(aClass, compLevel); 330 } 331 private native void clearMethodState0(Executable method); 332 public void clearMethodState(Executable method) { 333 Objects.requireNonNull(method); 334 clearMethodState0(method); 335 } 336 public native void lockCompilation(); 337 public native void unlockCompilation(); 338 private native int getMethodEntryBci0(Executable method); 339 public int getMethodEntryBci(Executable method) { 340 Objects.requireNonNull(method); 341 return getMethodEntryBci0(method); 342 } 343 private native Object[] getNMethod0(Executable method, boolean isOsr); 344 public Object[] getNMethod(Executable method, boolean isOsr) { 345 Objects.requireNonNull(method); 346 return getNMethod0(method, isOsr); 347 } 348 public native long allocateCodeBlob(int size, int type); 349 public long allocateCodeBlob(long size, int type) { 350 int intSize = (int) size; 351 if ((long) intSize != size || size < 0) { 352 throw new IllegalArgumentException( 353 "size argument has illegal value " + size); 354 } 355 return allocateCodeBlob( intSize, type); 356 } 357 public native void freeCodeBlob(long addr); 358 public native void forceNMethodSweep(); 359 public native Object[] getCodeHeapEntries(int type); 360 public native int getCompilationActivityMode(); 361 private native long getMethodData0(Executable method); 362 public long getMethodData(Executable method) { 363 Objects.requireNonNull(method); 364 return getMethodData0(method); 365 } 366 public native Object[] getCodeBlob(long addr); 367 368 private native void clearInlineCaches0(boolean preserve_static_stubs); 369 public void clearInlineCaches() { 370 clearInlineCaches0(false); 371 } 372 public void clearInlineCaches(boolean preserve_static_stubs) { 373 clearInlineCaches0(preserve_static_stubs); 374 } 375 376 // Intered strings 377 public native boolean isInStringTable(String str); 378 379 // Memory 380 public native void readReservedMemory(); 381 public native long allocateMetaspace(ClassLoader classLoader, long size); 382 public native void freeMetaspace(ClassLoader classLoader, long addr, long size); 383 public native long incMetaspaceCapacityUntilGC(long increment); 384 public native long metaspaceCapacityUntilGC(); 385 public native boolean metaspaceShouldConcurrentCollect(); 386 public native long metaspaceReserveAlignment(); 387 388 // Don't use these methods directly 389 // Use sun.hotspot.gc.GC class instead. 390 public native boolean isGCSupported(int name); 391 public native boolean isGCSelected(int name); 392 public native boolean isGCSelectedErgonomically(); 393 394 // Force Young GC 395 public native void youngGC(); 396 397 // Force Full GC 398 public native void fullGC(); 399 400 // Returns true if the current GC supports control of its concurrent 401 // phase via requestConcurrentGCPhase(). If false, a request will 402 // always fail. 403 public native boolean supportsConcurrentGCPhaseControl(); 404 405 // Returns an array of concurrent phase names provided by this 406 // collector. These are the names recognized by 407 // requestConcurrentGCPhase(). 408 public native String[] getConcurrentGCPhases(); 409 410 // Attempt to put the collector into the indicated concurrent phase, 411 // and attempt to remain in that state until a new request is made. 412 // 413 // Returns immediately if already in the requested phase. 414 // Otherwise, waits until the phase is reached. 415 // 416 // Throws IllegalStateException if unsupported by the current collector. 417 // Throws NullPointerException if phase is null. 418 // Throws IllegalArgumentException if phase is not valid for the current collector. 419 public void requestConcurrentGCPhase(String phase) { 420 if (!supportsConcurrentGCPhaseControl()) { 421 throw new IllegalStateException("Concurrent GC phase control not supported"); 422 } else if (phase == null) { 423 throw new NullPointerException("null phase"); 424 } else if (!requestConcurrentGCPhase0(phase)) { 425 throw new IllegalArgumentException("Unknown concurrent GC phase: " + phase); 426 } 427 } 428 429 // Helper for requestConcurrentGCPhase(). Returns true if request 430 // succeeded, false if the phase is invalid. 431 private native boolean requestConcurrentGCPhase0(String phase); 432 433 // Method tries to start concurrent mark cycle. 434 // It returns false if CM Thread is always in concurrent cycle. 435 public native boolean g1StartConcMarkCycle(); 436 437 // Tests on ReservedSpace/VirtualSpace classes 438 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); 439 public native void runMemoryUnitTests(); 440 public native void readFromNoaccessArea(); 441 public native long getThreadStackSize(); 442 public native long getThreadRemainingStackSize(); 443 444 // CPU features 445 public native String getCPUFeatures(); 446 447 // VM flags 448 public native boolean isConstantVMFlag(String name); 449 public native boolean isLockedVMFlag(String name); 450 public native void setBooleanVMFlag(String name, boolean value); 451 public native void setIntVMFlag(String name, long value); 452 public native void setUintVMFlag(String name, long value); 453 public native void setIntxVMFlag(String name, long value); 454 public native void setUintxVMFlag(String name, long value); 455 public native void setUint64VMFlag(String name, long value); 456 public native void setSizeTVMFlag(String name, long value); 457 public native void setStringVMFlag(String name, String value); 458 public native void setDoubleVMFlag(String name, double value); 459 public native Boolean getBooleanVMFlag(String name); 460 public native Long getIntVMFlag(String name); 461 public native Long getUintVMFlag(String name); 462 public native Long getIntxVMFlag(String name); 463 public native Long getUintxVMFlag(String name); 464 public native Long getUint64VMFlag(String name); 465 public native Long getSizeTVMFlag(String name); 466 public native String getStringVMFlag(String name); 467 public native Double getDoubleVMFlag(String name); 468 private final List<Function<String,Object>> flagsGetters = Arrays.asList( 469 this::getBooleanVMFlag, this::getIntVMFlag, this::getUintVMFlag, 470 this::getIntxVMFlag, this::getUintxVMFlag, this::getUint64VMFlag, 471 this::getSizeTVMFlag, this::getStringVMFlag, this::getDoubleVMFlag); 472 473 public Object getVMFlag(String name) { 474 return flagsGetters.stream() 475 .map(f -> f.apply(name)) 476 .filter(x -> x != null) 477 .findAny() 478 .orElse(null); 479 } 480 481 // Jigsaw 482 public native void DefineModule(Object module, boolean is_open, String version, 483 String location, Object[] packages); 484 public native void AddModuleExports(Object from_module, String pkg, Object to_module); 485 public native void AddReadsModule(Object from_module, Object source_module); 486 public native void AddModuleExportsToAllUnnamed(Object module, String pkg); 487 public native void AddModuleExportsToAll(Object module, String pkg); 488 489 public native int getOffsetForName0(String name); 490 public int getOffsetForName(String name) throws Exception { 491 int offset = getOffsetForName0(name); 492 if (offset == -1) { 493 throw new RuntimeException(name + " not found"); 494 } 495 return offset; 496 } 497 public native Boolean getMethodBooleanOption(Executable method, String name); 498 public native Long getMethodIntxOption(Executable method, String name); 499 public native Long getMethodUintxOption(Executable method, String name); 500 public native Double getMethodDoubleOption(Executable method, String name); 501 public native String getMethodStringOption(Executable method, String name); 502 private final List<BiFunction<Executable,String,Object>> methodOptionGetters 503 = Arrays.asList(this::getMethodBooleanOption, this::getMethodIntxOption, 504 this::getMethodUintxOption, this::getMethodDoubleOption, 505 this::getMethodStringOption); 506 507 public Object getMethodOption(Executable method, String name) { 508 return methodOptionGetters.stream() 509 .map(f -> f.apply(method, name)) 510 .filter(x -> x != null) 511 .findAny() 512 .orElse(null); 513 } 514 515 // Safepoint Checking 516 public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue); 517 518 // Sharing & archiving 519 public native String getDefaultArchivePath(); 520 public native boolean isSharingEnabled(); 521 public native boolean isShared(Object o); 522 public native boolean isSharedClass(Class<?> c); 523 public native boolean areSharedStringsIgnored(); 524 public native boolean isCDSIncludedInVmBuild(); 525 public native boolean isJFRIncludedInVmBuild(); 526 public native boolean isJavaHeapArchiveSupported(); 527 public native Object getResolvedReferences(Class<?> c); 528 public native boolean areOpenArchiveHeapObjectsMapped(); 529 530 // Compiler Directive 531 public native int addCompilerDirective(String compDirect); 532 public native void removeCompilerDirective(int count); 533 534 // Handshakes 535 public native int handshakeWalkStack(Thread t, boolean all_threads); 536 537 // Returns true on linux if library has the noexecstack flag set. 538 public native boolean checkLibSpecifiesNoexecstack(String libfilename); 539 540 // Container testing 541 public native boolean isContainerized(); 542 public native void printOsInfo(); 543 544 // Decoder 545 public native void disableElfSectionCache(); 546 547 // Resolved Method Table 548 public native int resolvedMethodRemovedCount(); 549 550 // Protection Domain Table 551 public native int protectionDomainRemovedCount(); 552 553 // Number of loaded AOT libraries 554 public native int aotLibrariesCount(); 555 }