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.util.stream.Stream; 34 import java.security.BasicPermission; 35 import java.util.Objects; 36 37 import sun.hotspot.parser.DiagnosticCommand; 38 39 public class WhiteBox { 40 41 @SuppressWarnings("serial") 42 public static class WhiteBoxPermission extends BasicPermission { 43 public WhiteBoxPermission(String s) { 44 super(s); 45 } 46 } 47 48 private WhiteBox() {} 49 private static final WhiteBox instance = new WhiteBox(); 50 private static native void registerNatives(); 51 52 /** 53 * Returns the singleton WhiteBox instance. 54 * 55 * The returned WhiteBox object should be carefully guarded 56 * by the caller, since it can be used to read and write data 57 * at arbitrary memory addresses. It must never be passed to 58 * untrusted code. 59 */ 60 public synchronized static WhiteBox getWhiteBox() { 61 SecurityManager sm = System.getSecurityManager(); 62 if (sm != null) { 63 sm.checkPermission(new WhiteBoxPermission("getInstance")); 64 } 65 return instance; 66 } 67 68 static { 69 registerNatives(); 70 } 71 72 // Get the maximum heap size supporting COOPs 73 public native long getCompressedOopsMaxHeapSize(); 74 // Arguments 75 public native void printHeapSizes(); 76 77 // Memory 78 private native long getObjectAddress0(Object o); 79 public long getObjectAddress(Object o) { 80 Objects.requireNonNull(o); 81 return getObjectAddress0(o); 82 } 83 84 public native int getHeapOopSize(); 85 public native int getVMPageSize(); 86 public native long getVMAllocationGranularity(); 87 public native long getVMLargePageSize(); 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 // JVMTI 117 private native void addToBootstrapClassLoaderSearch0(String segment); 118 public void addToBootstrapClassLoaderSearch(String segment){ 119 Objects.requireNonNull(segment); 120 addToBootstrapClassLoaderSearch0(segment); 121 } 122 123 private native void addToSystemClassLoaderSearch0(String segment); 124 public void addToSystemClassLoaderSearch(String segment) { 125 Objects.requireNonNull(segment); 126 addToSystemClassLoaderSearch0(segment); 127 } 128 129 // G1 130 public native boolean g1InConcurrentMark(); 131 private native boolean g1IsHumongous0(Object o); 132 public boolean g1IsHumongous(Object o) { 133 Objects.requireNonNull(o); 134 return g1IsHumongous0(o); 135 } 136 137 public native long g1NumMaxRegions(); 138 public native long g1NumFreeRegions(); 139 public native int g1RegionSize(); 140 public native MemoryUsage g1AuxiliaryMemoryUsage(); 141 private native Object[] parseCommandLine0(String commandline, char delim, DiagnosticCommand[] args); 142 public Object[] parseCommandLine(String commandline, char delim, DiagnosticCommand[] args) { 143 Objects.requireNonNull(args); 144 return parseCommandLine0(commandline, delim, args); 145 } 146 147 // NMT 148 public native long NMTMalloc(long size); 149 public native void NMTFree(long mem); 150 public native long NMTReserveMemory(long size); 151 public native void NMTCommitMemory(long addr, long size); 152 public native void NMTUncommitMemory(long addr, long size); 153 public native void NMTReleaseMemory(long addr, long size); 154 public native long NMTMallocWithPseudoStack(long size, int index); 155 public native boolean NMTChangeTrackingLevel(); 156 public native int NMTGetHashSize(); 157 158 // Compiler 159 public native int deoptimizeFrames(boolean makeNotEntrant); 160 public native void deoptimizeAll(); 161 public boolean isMethodCompiled(Executable method) { 162 return isMethodCompiled(method, false /*not osr*/); 163 } 164 private native boolean isMethodCompiled0(Executable method, boolean isOsr); 165 public boolean isMethodCompiled(Executable method, boolean isOsr){ 166 Objects.requireNonNull(method); 167 return isMethodCompiled0(method, isOsr); 168 } 169 public boolean isMethodCompilable(Executable method) { 170 return isMethodCompilable(method, -1 /*any*/); 171 } 172 public boolean isMethodCompilable(Executable method, int compLevel) { 173 return isMethodCompilable(method, compLevel, false /*not osr*/); 174 } 175 private native boolean isMethodCompilable0(Executable method, int compLevel, boolean isOsr); 176 public boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr) { 177 Objects.requireNonNull(method); 178 return isMethodCompilable0(method, compLevel, isOsr); 179 } 180 private native boolean isMethodQueuedForCompilation0(Executable method); 181 public boolean isMethodQueuedForCompilation(Executable method) { 182 Objects.requireNonNull(method); 183 return isMethodQueuedForCompilation0(method); 184 } 185 // Determine if the compiler corresponding to the compilation level 'compLevel' 186 // and to the compilation context 'compilation_context' provides an intrinsic 187 // for the method 'method'. An intrinsic is available for method 'method' if: 188 // - the intrinsic is enabled (by using the appropriate command-line flag) and 189 // - the platform on which the VM is running provides the instructions necessary 190 // for the compiler to generate the intrinsic code. 191 // 192 // The compilation context is related to using the DisableIntrinsic flag on a 193 // per-method level, see hotspot/src/share/vm/compiler/abstractCompiler.hpp 194 // for more details. 195 public boolean isIntrinsicAvailableForMethod(Executable method, 196 Executable compilationContext, 197 int compLevel) { 198 Objects.requireNonNull(method); 199 return isIntrinsicAvailableForMethod0(method, compilationContext, compLevel); 200 } 201 // If usage of the DisableIntrinsic flag is not expected (or the usage can be ignored), 202 // use the below method that does not require the compilation context as argument. 203 public boolean isIntrinsicAvailableForMethod(Executable method, int compLevel) { 204 return isIntrinsicAvailableForMethod(method, null, compLevel); 205 } 206 private native boolean isIntrinsicAvailableForMethod0(Executable method, 207 Executable compilationContext, 208 int compLevel); 209 public int deoptimizeMethod(Executable method) { 210 return deoptimizeMethod(method, false /*not osr*/); 211 } 212 private native int deoptimizeMethod0(Executable method, boolean isOsr); 213 public int deoptimizeMethod(Executable method, boolean isOsr) { 214 Objects.requireNonNull(method); 215 return deoptimizeMethod0(method, isOsr); 216 } 217 public void makeMethodNotCompilable(Executable method) { 218 makeMethodNotCompilable(method, -1 /*any*/); 219 } 220 public void makeMethodNotCompilable(Executable method, int compLevel) { 221 makeMethodNotCompilable(method, compLevel, false /*not osr*/); 222 } 223 private native void makeMethodNotCompilable0(Executable method, int compLevel, boolean isOsr); 224 public void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr) { 225 Objects.requireNonNull(method); 226 makeMethodNotCompilable0(method, compLevel, isOsr); 227 } 228 public int getMethodCompilationLevel(Executable method) { 229 return getMethodCompilationLevel(method, false /*not ost*/); 230 } 231 private native int getMethodCompilationLevel0(Executable method, boolean isOsr); 232 public int getMethodCompilationLevel(Executable method, boolean isOsr) { 233 Objects.requireNonNull(method); 234 return getMethodCompilationLevel0(method, isOsr); 235 } 236 private native boolean testSetDontInlineMethod0(Executable method, boolean value); 237 public boolean testSetDontInlineMethod(Executable method, boolean value) { 238 Objects.requireNonNull(method); 239 return testSetDontInlineMethod0(method, value); 240 } 241 public int getCompileQueuesSize() { 242 return getCompileQueueSize(-1 /*any*/); 243 } 244 public native int getCompileQueueSize(int compLevel); 245 private native boolean testSetForceInlineMethod0(Executable method, boolean value); 246 public boolean testSetForceInlineMethod(Executable method, boolean value) { 247 Objects.requireNonNull(method); 248 return testSetForceInlineMethod0(method, value); 249 } 250 public boolean enqueueMethodForCompilation(Executable method, int compLevel) { 251 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); 252 } 253 private native boolean enqueueMethodForCompilation0(Executable method, int compLevel, int entry_bci); 254 public boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci) { 255 Objects.requireNonNull(method); 256 return enqueueMethodForCompilation0(method, compLevel, entry_bci); 257 } 258 private native void clearMethodState0(Executable method); 259 public void clearMethodState(Executable method) { 260 Objects.requireNonNull(method); 261 clearMethodState0(method); 262 } 263 public native void lockCompilation(); 264 public native void unlockCompilation(); 265 private native int getMethodEntryBci0(Executable method); 266 public int getMethodEntryBci(Executable method) { 267 Objects.requireNonNull(method); 268 return getMethodEntryBci0(method); 269 } 270 private native Object[] getNMethod0(Executable method, boolean isOsr); 271 public Object[] getNMethod(Executable method, boolean isOsr) { 272 Objects.requireNonNull(method); 273 return getNMethod0(method, isOsr); 274 } 275 public native long allocateCodeBlob(int size, int type); 276 public long allocateCodeBlob(long size, int type) { 277 int intSize = (int) size; 278 if ((long) intSize != size || size < 0) { 279 throw new IllegalArgumentException( 280 "size argument has illegal value " + size); 281 } 282 return allocateCodeBlob( intSize, type); 283 } 284 public native void freeCodeBlob(long addr); 285 public native void forceNMethodSweep(); 286 public native Object[] getCodeHeapEntries(int type); 287 public native int getCompilationActivityMode(); 288 public native Object[] getCodeBlob(long addr); 289 290 // Intered strings 291 public native boolean isInStringTable(String str); 292 293 // Memory 294 public native void readReservedMemory(); 295 public native long allocateMetaspace(ClassLoader classLoader, long size); 296 public native void freeMetaspace(ClassLoader classLoader, long addr, long size); 297 public native long incMetaspaceCapacityUntilGC(long increment); 298 public native long metaspaceCapacityUntilGC(); 299 300 // Force Young GC 301 public native void youngGC(); 302 303 // Force Full GC 304 public native void fullGC(); 305 306 // Method tries to start concurrent mark cycle. 307 // It returns false if CM Thread is always in concurrent cycle. 308 public native boolean g1StartConcMarkCycle(); 309 310 // Tests on ReservedSpace/VirtualSpace classes 311 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); 312 public native void runMemoryUnitTests(); 313 public native void readFromNoaccessArea(); 314 public native long getThreadStackSize(); 315 public native long getThreadRemainingStackSize(); 316 317 // CPU features 318 public native String getCPUFeatures(); 319 320 // Native extensions 321 public native long getHeapUsageForContext(int context); 322 public native long getHeapRegionCountForContext(int context); 323 private native int getContextForObject0(Object obj); 324 public int getContextForObject(Object obj) { 325 Objects.requireNonNull(obj); 326 return getContextForObject0(obj); 327 } 328 public native void printRegionInfo(int context); 329 330 // VM flags 331 public native boolean isConstantVMFlag(String name); 332 public native boolean isLockedVMFlag(String name); 333 public native void setBooleanVMFlag(String name, boolean value); 334 public native void setIntVMFlag(String name, long value); 335 public native void setUintVMFlag(String name, long value); 336 public native void setIntxVMFlag(String name, long value); 337 public native void setUintxVMFlag(String name, long value); 338 public native void setUint64VMFlag(String name, long value); 339 public native void setSizeTVMFlag(String name, long value); 340 public native void setStringVMFlag(String name, String value); 341 public native void setDoubleVMFlag(String name, double value); 342 public native Boolean getBooleanVMFlag(String name); 343 public native Long getIntVMFlag(String name); 344 public native Long getUintVMFlag(String name); 345 public native Long getIntxVMFlag(String name); 346 public native Long getUintxVMFlag(String name); 347 public native Long getUint64VMFlag(String name); 348 public native Long getSizeTVMFlag(String name); 349 public native String getStringVMFlag(String name); 350 public native Double getDoubleVMFlag(String name); 351 private final List<Function<String,Object>> flagsGetters = Arrays.asList( 352 this::getBooleanVMFlag, this::getIntVMFlag, this::getUintVMFlag, 353 this::getIntxVMFlag, this::getUintxVMFlag, this::getUint64VMFlag, 354 this::getSizeTVMFlag, this::getStringVMFlag, this::getDoubleVMFlag); 355 356 public Object getVMFlag(String name) { 357 return flagsGetters.stream() 358 .map(f -> f.apply(name)) 359 .filter(x -> x != null) 360 .findAny() 361 .orElse(null); 362 } 363 public native int getOffsetForName0(String name); 364 public int getOffsetForName(String name) throws Exception { 365 int offset = getOffsetForName0(name); 366 if (offset == -1) { 367 throw new RuntimeException(name + " not found"); 368 } 369 return offset; 370 } 371 public native Boolean getMethodBooleanOption(Executable method, String name); 372 public native Long getMethodIntxOption(Executable method, String name); 373 public native Long getMethodUintxOption(Executable method, String name); 374 public native Double getMethodDoubleOption(Executable method, String name); 375 public native String getMethodStringOption(Executable method, String name); 376 private final List<BiFunction<Executable,String,Object>> methodOptionGetters 377 = Arrays.asList(this::getMethodBooleanOption, this::getMethodIntxOption, 378 this::getMethodUintxOption, this::getMethodDoubleOption, 379 this::getMethodStringOption); 380 381 public Object getMethodOption(Executable method, String name) { 382 return methodOptionGetters.stream() 383 .map(f -> f.apply(method, name)) 384 .filter(x -> x != null) 385 .findAny() 386 .orElse(null); 387 } 388 389 // Safepoint Checking 390 public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue); 391 392 // Sharing 393 public native boolean isShared(Object o); 394 public native boolean areSharedStringsIgnored(); 395 }