WhiteBox.java revision 1814:a178cfd8a297
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.security.BasicPermission; 34import java.util.Objects; 35import jdk.internal.HotSpotIntrinsicCandidate; 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 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 // JVMTI 123 private native void addToBootstrapClassLoaderSearch0(String segment); 124 public void addToBootstrapClassLoaderSearch(String segment){ 125 Objects.requireNonNull(segment); 126 addToBootstrapClassLoaderSearch0(segment); 127 } 128 129 private native void addToSystemClassLoaderSearch0(String segment); 130 public void addToSystemClassLoaderSearch(String segment) { 131 Objects.requireNonNull(segment); 132 addToSystemClassLoaderSearch0(segment); 133 } 134 135 // G1 136 public native boolean g1InConcurrentMark(); 137 private native boolean g1IsHumongous0(Object o); 138 public boolean g1IsHumongous(Object o) { 139 Objects.requireNonNull(o); 140 return g1IsHumongous0(o); 141 } 142 143 public native long g1NumMaxRegions(); 144 public native long g1NumFreeRegions(); 145 public native int g1RegionSize(); 146 public native MemoryUsage g1AuxiliaryMemoryUsage(); 147 private native Object[] parseCommandLine0(String commandline, char delim, DiagnosticCommand[] args); 148 public Object[] parseCommandLine(String commandline, char delim, DiagnosticCommand[] args) { 149 Objects.requireNonNull(args); 150 return parseCommandLine0(commandline, delim, args); 151 } 152 153 // Parallel GC 154 public native long psVirtualSpaceAlignment(); 155 public native long psHeapGenerationAlignment(); 156 157 // NMT 158 public native long NMTMalloc(long size); 159 public native void NMTFree(long mem); 160 public native long NMTReserveMemory(long size); 161 public native void NMTCommitMemory(long addr, long size); 162 public native void NMTUncommitMemory(long addr, long size); 163 public native void NMTReleaseMemory(long addr, long size); 164 public native long NMTMallocWithPseudoStack(long size, int index); 165 public native boolean NMTChangeTrackingLevel(); 166 public native int NMTGetHashSize(); 167 168 // Compiler 169 public native int matchesMethod(Executable method, String pattern); 170 public native int matchesInline(Executable method, String pattern); 171 public native boolean shouldPrintAssembly(Executable method); 172 public native int deoptimizeFrames(boolean makeNotEntrant); 173 public native void deoptimizeAll(); 174 175 @HotSpotIntrinsicCandidate 176 public void deoptimize() {} 177 public boolean isMethodCompiled(Executable method) { 178 return isMethodCompiled(method, false /*not osr*/); 179 } 180 private native boolean isMethodCompiled0(Executable method, boolean isOsr); 181 public boolean isMethodCompiled(Executable method, boolean isOsr){ 182 Objects.requireNonNull(method); 183 return isMethodCompiled0(method, isOsr); 184 } 185 public boolean isMethodCompilable(Executable method) { 186 return isMethodCompilable(method, -1 /*any*/); 187 } 188 public boolean isMethodCompilable(Executable method, int compLevel) { 189 return isMethodCompilable(method, compLevel, false /*not osr*/); 190 } 191 private native boolean isMethodCompilable0(Executable method, int compLevel, boolean isOsr); 192 public boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr) { 193 Objects.requireNonNull(method); 194 return isMethodCompilable0(method, compLevel, isOsr); 195 } 196 private native boolean isMethodQueuedForCompilation0(Executable method); 197 public boolean isMethodQueuedForCompilation(Executable method) { 198 Objects.requireNonNull(method); 199 return isMethodQueuedForCompilation0(method); 200 } 201 // Determine if the compiler corresponding to the compilation level 'compLevel' 202 // and to the compilation context 'compilation_context' provides an intrinsic 203 // for the method 'method'. An intrinsic is available for method 'method' if: 204 // - the intrinsic is enabled (by using the appropriate command-line flag) and 205 // - the platform on which the VM is running provides the instructions necessary 206 // for the compiler to generate the intrinsic code. 207 // 208 // The compilation context is related to using the DisableIntrinsic flag on a 209 // per-method level, see hotspot/src/share/vm/compiler/abstractCompiler.hpp 210 // for more details. 211 public boolean isIntrinsicAvailable(Executable method, 212 Executable compilationContext, 213 int compLevel) { 214 Objects.requireNonNull(method); 215 return isIntrinsicAvailable0(method, compilationContext, compLevel); 216 } 217 // If usage of the DisableIntrinsic flag is not expected (or the usage can be ignored), 218 // use the below method that does not require the compilation context as argument. 219 public boolean isIntrinsicAvailable(Executable method, int compLevel) { 220 return isIntrinsicAvailable(method, null, compLevel); 221 } 222 private native boolean isIntrinsicAvailable0(Executable method, 223 Executable compilationContext, 224 int compLevel); 225 public int deoptimizeMethod(Executable method) { 226 return deoptimizeMethod(method, false /*not osr*/); 227 } 228 private native int deoptimizeMethod0(Executable method, boolean isOsr); 229 public int deoptimizeMethod(Executable method, boolean isOsr) { 230 Objects.requireNonNull(method); 231 return deoptimizeMethod0(method, isOsr); 232 } 233 public void makeMethodNotCompilable(Executable method) { 234 makeMethodNotCompilable(method, -1 /*any*/); 235 } 236 public void makeMethodNotCompilable(Executable method, int compLevel) { 237 makeMethodNotCompilable(method, compLevel, false /*not osr*/); 238 } 239 private native void makeMethodNotCompilable0(Executable method, int compLevel, boolean isOsr); 240 public void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr) { 241 Objects.requireNonNull(method); 242 makeMethodNotCompilable0(method, compLevel, isOsr); 243 } 244 public int getMethodCompilationLevel(Executable method) { 245 return getMethodCompilationLevel(method, false /*not ost*/); 246 } 247 private native int getMethodCompilationLevel0(Executable method, boolean isOsr); 248 public int getMethodCompilationLevel(Executable method, boolean isOsr) { 249 Objects.requireNonNull(method); 250 return getMethodCompilationLevel0(method, isOsr); 251 } 252 private native boolean testSetDontInlineMethod0(Executable method, boolean value); 253 public boolean testSetDontInlineMethod(Executable method, boolean value) { 254 Objects.requireNonNull(method); 255 return testSetDontInlineMethod0(method, value); 256 } 257 public int getCompileQueuesSize() { 258 return getCompileQueueSize(-1 /*any*/); 259 } 260 public native int getCompileQueueSize(int compLevel); 261 private native boolean testSetForceInlineMethod0(Executable method, boolean value); 262 public boolean testSetForceInlineMethod(Executable method, boolean value) { 263 Objects.requireNonNull(method); 264 return testSetForceInlineMethod0(method, value); 265 } 266 public boolean enqueueMethodForCompilation(Executable method, int compLevel) { 267 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); 268 } 269 private native boolean enqueueMethodForCompilation0(Executable method, int compLevel, int entry_bci); 270 public boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci) { 271 Objects.requireNonNull(method); 272 return enqueueMethodForCompilation0(method, compLevel, entry_bci); 273 } 274 private native void clearMethodState0(Executable method); 275 public void clearMethodState(Executable method) { 276 Objects.requireNonNull(method); 277 clearMethodState0(method); 278 } 279 public native void lockCompilation(); 280 public native void unlockCompilation(); 281 private native int getMethodEntryBci0(Executable method); 282 public int getMethodEntryBci(Executable method) { 283 Objects.requireNonNull(method); 284 return getMethodEntryBci0(method); 285 } 286 private native Object[] getNMethod0(Executable method, boolean isOsr); 287 public Object[] getNMethod(Executable method, boolean isOsr) { 288 Objects.requireNonNull(method); 289 return getNMethod0(method, isOsr); 290 } 291 public native long allocateCodeBlob(int size, int type); 292 public long allocateCodeBlob(long size, int type) { 293 int intSize = (int) size; 294 if ((long) intSize != size || size < 0) { 295 throw new IllegalArgumentException( 296 "size argument has illegal value " + size); 297 } 298 return allocateCodeBlob( intSize, type); 299 } 300 public native void freeCodeBlob(long addr); 301 public native void forceNMethodSweep(); 302 public native Object[] getCodeHeapEntries(int type); 303 public native int getCompilationActivityMode(); 304 private native long getMethodData0(Executable method); 305 public long getMethodData(Executable method) { 306 Objects.requireNonNull(method); 307 return getMethodData0(method); 308 } 309 public native Object[] getCodeBlob(long addr); 310 311 public native void clearInlineCaches(); 312 313 // Intered strings 314 public native boolean isInStringTable(String str); 315 316 // Memory 317 public native void readReservedMemory(); 318 public native long allocateMetaspace(ClassLoader classLoader, long size); 319 public native void freeMetaspace(ClassLoader classLoader, long addr, long size); 320 public native long incMetaspaceCapacityUntilGC(long increment); 321 public native long metaspaceCapacityUntilGC(); 322 323 // Force Young GC 324 public native void youngGC(); 325 326 // Force Full GC 327 public native void fullGC(); 328 329 // Method tries to start concurrent mark cycle. 330 // It returns false if CM Thread is always in concurrent cycle. 331 public native boolean g1StartConcMarkCycle(); 332 333 // Tests on ReservedSpace/VirtualSpace classes 334 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); 335 public native void runMemoryUnitTests(); 336 public native void readFromNoaccessArea(); 337 public native long getThreadStackSize(); 338 public native long getThreadRemainingStackSize(); 339 340 // CPU features 341 public native String getCPUFeatures(); 342 343 // Native extensions 344 public native long getHeapUsageForContext(int context); 345 public native long getHeapRegionCountForContext(int context); 346 private native int getContextForObject0(Object obj); 347 public int getContextForObject(Object obj) { 348 Objects.requireNonNull(obj); 349 return getContextForObject0(obj); 350 } 351 public native void printRegionInfo(int context); 352 353 // VM flags 354 public native boolean isConstantVMFlag(String name); 355 public native boolean isLockedVMFlag(String name); 356 public native void setBooleanVMFlag(String name, boolean value); 357 public native void setIntVMFlag(String name, long value); 358 public native void setUintVMFlag(String name, long value); 359 public native void setIntxVMFlag(String name, long value); 360 public native void setUintxVMFlag(String name, long value); 361 public native void setUint64VMFlag(String name, long value); 362 public native void setSizeTVMFlag(String name, long value); 363 public native void setStringVMFlag(String name, String value); 364 public native void setDoubleVMFlag(String name, double value); 365 public native Boolean getBooleanVMFlag(String name); 366 public native Long getIntVMFlag(String name); 367 public native Long getUintVMFlag(String name); 368 public native Long getIntxVMFlag(String name); 369 public native Long getUintxVMFlag(String name); 370 public native Long getUint64VMFlag(String name); 371 public native Long getSizeTVMFlag(String name); 372 public native String getStringVMFlag(String name); 373 public native Double getDoubleVMFlag(String name); 374 private final List<Function<String,Object>> flagsGetters = Arrays.asList( 375 this::getBooleanVMFlag, this::getIntVMFlag, this::getUintVMFlag, 376 this::getIntxVMFlag, this::getUintxVMFlag, this::getUint64VMFlag, 377 this::getSizeTVMFlag, this::getStringVMFlag, this::getDoubleVMFlag); 378 379 public Object getVMFlag(String name) { 380 return flagsGetters.stream() 381 .map(f -> f.apply(name)) 382 .filter(x -> x != null) 383 .findAny() 384 .orElse(null); 385 } 386 public native int getOffsetForName0(String name); 387 public int getOffsetForName(String name) throws Exception { 388 int offset = getOffsetForName0(name); 389 if (offset == -1) { 390 throw new RuntimeException(name + " not found"); 391 } 392 return offset; 393 } 394 public native Boolean getMethodBooleanOption(Executable method, String name); 395 public native Long getMethodIntxOption(Executable method, String name); 396 public native Long getMethodUintxOption(Executable method, String name); 397 public native Double getMethodDoubleOption(Executable method, String name); 398 public native String getMethodStringOption(Executable method, String name); 399 private final List<BiFunction<Executable,String,Object>> methodOptionGetters 400 = Arrays.asList(this::getMethodBooleanOption, this::getMethodIntxOption, 401 this::getMethodUintxOption, this::getMethodDoubleOption, 402 this::getMethodStringOption); 403 404 public Object getMethodOption(Executable method, String name) { 405 return methodOptionGetters.stream() 406 .map(f -> f.apply(method, name)) 407 .filter(x -> x != null) 408 .findAny() 409 .orElse(null); 410 } 411 412 // Safepoint Checking 413 public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue); 414 415 // Sharing 416 public native boolean isSharedClass(Class<?> c); 417 public native boolean isShared(Object o); 418 public native boolean areSharedStringsIgnored(); 419} 420