1 /*
2 * Copyright (c) 2012, 2020, 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 int countAliveClasses(String name) {
103 return countAliveClasses0(name.replace('.', '/'));
104 }
105 private native int countAliveClasses0(String name);
106
107 public boolean isClassAlive(String name) {
108 return countAliveClasses(name) != 0;
109 }
110
111 public native int getSymbolRefcount(String name);
112
113 private native boolean isMonitorInflated0(Object obj);
114 public boolean isMonitorInflated(Object obj) {
115 Objects.requireNonNull(obj);
116 return isMonitorInflated0(obj);
117 }
118
119 public native void forceSafepoint();
120
121 private native long getConstantPool0(Class<?> aClass);
122 public long getConstantPool(Class<?> aClass) {
123 Objects.requireNonNull(aClass);
124 return getConstantPool0(aClass);
125 }
126
127 private native int getConstantPoolCacheIndexTag0();
128 public int getConstantPoolCacheIndexTag() {
129 return getConstantPoolCacheIndexTag0();
130 }
131
132 private native int getConstantPoolCacheLength0(Class<?> aClass);
133 public int getConstantPoolCacheLength(Class<?> aClass) {
134 Objects.requireNonNull(aClass);
135 return getConstantPoolCacheLength0(aClass);
136 }
137
138 private native int remapInstructionOperandFromCPCache0(Class<?> aClass, int index);
139 public int remapInstructionOperandFromCPCache(Class<?> aClass, int index) {
140 Objects.requireNonNull(aClass);
141 return remapInstructionOperandFromCPCache0(aClass, index);
142 }
143
144 private native int encodeConstantPoolIndyIndex0(int index);
145 public int encodeConstantPoolIndyIndex(int index) {
146 return encodeConstantPoolIndyIndex0(index);
147 }
148
149 // JVMTI
150 private native void addToBootstrapClassLoaderSearch0(String segment);
151 public void addToBootstrapClassLoaderSearch(String segment){
152 Objects.requireNonNull(segment);
153 addToBootstrapClassLoaderSearch0(segment);
154 }
155
156 private native void addToSystemClassLoaderSearch0(String segment);
157 public void addToSystemClassLoaderSearch(String segment) {
158 Objects.requireNonNull(segment);
159 addToSystemClassLoaderSearch0(segment);
160 }
161
162 // G1
163 public native boolean g1InConcurrentMark();
164 private native boolean g1IsHumongous0(Object o);
165 public boolean g1IsHumongous(Object o) {
166 Objects.requireNonNull(o);
167 return g1IsHumongous0(o);
168 }
169
170 private native boolean g1BelongsToHumongousRegion0(long adr);
171 public boolean g1BelongsToHumongousRegion(long adr) {
172 if (adr == 0) {
173 throw new IllegalArgumentException("adr argument should not be null");
174 }
175 return g1BelongsToHumongousRegion0(adr);
176 }
177
178
179 private native boolean g1BelongsToFreeRegion0(long adr);
180 public boolean g1BelongsToFreeRegion(long adr) {
181 if (adr == 0) {
182 throw new IllegalArgumentException("adr argument should not be null");
183 }
184 return g1BelongsToFreeRegion0(adr);
185 }
186
187 public native long g1NumMaxRegions();
188 public native long g1NumFreeRegions();
189 public native int g1RegionSize();
190 public native long dramReservedStart();
191 public native long dramReservedEnd();
192 public native long nvdimmReservedStart();
193 public native long nvdimmReservedEnd();
194 public native MemoryUsage g1AuxiliaryMemoryUsage();
195 private native Object[] parseCommandLine0(String commandline, char delim, DiagnosticCommand[] args);
196 public Object[] parseCommandLine(String commandline, char delim, DiagnosticCommand[] args) {
197 Objects.requireNonNull(args);
198 return parseCommandLine0(commandline, delim, args);
199 }
200
201 public native int g1ActiveMemoryNodeCount();
202 public native int[] g1MemoryNodeIds();
203
204 // Parallel GC
205 public native long psVirtualSpaceAlignment();
206 public native long psHeapGenerationAlignment();
207
208 /**
209 * Enumerates old regions with liveness less than specified and produces some statistics
210 * @param liveness percent of region's liveness (live_objects / total_region_size * 100).
211 * @return long[3] array where long[0] - total count of old regions
212 * long[1] - total memory of old regions
213 * long[2] - lowest estimation of total memory of old regions to be freed (non-full
214 * regions are not included)
215 */
216 public native long[] g1GetMixedGCInfo(int liveness);
217
218 // NMT
219 public native long NMTMalloc(long size);
220 public native void NMTFree(long mem);
221 public native long NMTReserveMemory(long size);
222 public native long NMTAttemptReserveMemoryAt(long addr, long size);
223 public native void NMTCommitMemory(long addr, long size);
224 public native void NMTUncommitMemory(long addr, long size);
225 public native void NMTReleaseMemory(long addr, long size);
226 public native long NMTMallocWithPseudoStack(long size, int index);
227 public native long NMTMallocWithPseudoStackAndType(long size, int index, int type);
228 public native boolean NMTChangeTrackingLevel();
229 public native int NMTGetHashSize();
230 public native long NMTNewArena(long initSize);
231 public native void NMTFreeArena(long arena);
232 public native void NMTArenaMalloc(long arena, long size);
233
234 // Compiler
235 public native boolean isC2OrJVMCIIncludedInVmBuild();
236
237 public native int matchesMethod(Executable method, String pattern);
238 public native int matchesInline(Executable method, String pattern);
239 public native boolean shouldPrintAssembly(Executable method, int comp_level);
240 public native int deoptimizeFrames(boolean makeNotEntrant);
241 public native void deoptimizeAll();
242
243 public boolean isMethodCompiled(Executable method) {
244 return isMethodCompiled(method, false /*not osr*/);
245 }
246 private native boolean isMethodCompiled0(Executable method, boolean isOsr);
247 public boolean isMethodCompiled(Executable method, boolean isOsr){
248 Objects.requireNonNull(method);
249 return isMethodCompiled0(method, isOsr);
250 }
251 public boolean isMethodCompilable(Executable method) {
252 return isMethodCompilable(method, -2 /*any*/);
253 }
254 public boolean isMethodCompilable(Executable method, int compLevel) {
255 return isMethodCompilable(method, compLevel, false /*not osr*/);
256 }
257 private native boolean isMethodCompilable0(Executable method, int compLevel, boolean isOsr);
258 public boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr) {
259 Objects.requireNonNull(method);
260 return isMethodCompilable0(method, compLevel, isOsr);
261 }
262 private native boolean isMethodQueuedForCompilation0(Executable method);
263 public boolean isMethodQueuedForCompilation(Executable method) {
264 Objects.requireNonNull(method);
265 return isMethodQueuedForCompilation0(method);
266 }
267 // Determine if the compiler corresponding to the compilation level 'compLevel'
268 // and to the compilation context 'compilation_context' provides an intrinsic
269 // for the method 'method'. An intrinsic is available for method 'method' if:
270 // - the intrinsic is enabled (by using the appropriate command-line flag) and
271 // - the platform on which the VM is running provides the instructions necessary
272 // for the compiler to generate the intrinsic code.
273 //
274 // The compilation context is related to using the DisableIntrinsic flag on a
275 // per-method level, see hotspot/src/share/vm/compiler/abstractCompiler.hpp
276 // for more details.
277 public boolean isIntrinsicAvailable(Executable method,
278 Executable compilationContext,
279 int compLevel) {
280 Objects.requireNonNull(method);
281 return isIntrinsicAvailable0(method, compilationContext, compLevel);
282 }
283 // If usage of the DisableIntrinsic flag is not expected (or the usage can be ignored),
284 // use the below method that does not require the compilation context as argument.
285 public boolean isIntrinsicAvailable(Executable method, int compLevel) {
286 return isIntrinsicAvailable(method, null, compLevel);
287 }
288 private native boolean isIntrinsicAvailable0(Executable method,
289 Executable compilationContext,
290 int compLevel);
291 public int deoptimizeMethod(Executable method) {
292 return deoptimizeMethod(method, false /*not osr*/);
293 }
294 private native int deoptimizeMethod0(Executable method, boolean isOsr);
295 public int deoptimizeMethod(Executable method, boolean isOsr) {
296 Objects.requireNonNull(method);
297 return deoptimizeMethod0(method, isOsr);
298 }
299 public void makeMethodNotCompilable(Executable method) {
300 makeMethodNotCompilable(method, -2 /*any*/);
301 }
302 public void makeMethodNotCompilable(Executable method, int compLevel) {
303 makeMethodNotCompilable(method, compLevel, false /*not osr*/);
304 }
305 private native void makeMethodNotCompilable0(Executable method, int compLevel, boolean isOsr);
306 public void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr) {
307 Objects.requireNonNull(method);
308 makeMethodNotCompilable0(method, compLevel, isOsr);
309 }
310 public int getMethodCompilationLevel(Executable method) {
311 return getMethodCompilationLevel(method, false /*not ost*/);
312 }
313 private native int getMethodCompilationLevel0(Executable method, boolean isOsr);
314 public int getMethodCompilationLevel(Executable method, boolean isOsr) {
315 Objects.requireNonNull(method);
316 return getMethodCompilationLevel0(method, isOsr);
317 }
318 private native boolean testSetDontInlineMethod0(Executable method, boolean value);
319 public boolean testSetDontInlineMethod(Executable method, boolean value) {
320 Objects.requireNonNull(method);
321 return testSetDontInlineMethod0(method, value);
322 }
323 public int getCompileQueuesSize() {
324 return getCompileQueueSize(-2 /*any*/);
325 }
326 public native int getCompileQueueSize(int compLevel);
327 private native boolean testSetForceInlineMethod0(Executable method, boolean value);
328 public boolean testSetForceInlineMethod(Executable method, boolean value) {
329 Objects.requireNonNull(method);
330 return testSetForceInlineMethod0(method, value);
331 }
332 public boolean enqueueMethodForCompilation(Executable method, int compLevel) {
333 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
334 }
335 private native boolean enqueueMethodForCompilation0(Executable method, int compLevel, int entry_bci);
336 public boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci) {
337 Objects.requireNonNull(method);
338 return enqueueMethodForCompilation0(method, compLevel, entry_bci);
339 }
340 private native boolean enqueueInitializerForCompilation0(Class<?> aClass, int compLevel);
341 public boolean enqueueInitializerForCompilation(Class<?> aClass, int compLevel) {
342 Objects.requireNonNull(aClass);
343 return enqueueInitializerForCompilation0(aClass, compLevel);
344 }
345 private native void clearMethodState0(Executable method);
346 public native void markMethodProfiled(Executable method);
347 public void clearMethodState(Executable method) {
348 Objects.requireNonNull(method);
349 clearMethodState0(method);
350 }
351 public native void lockCompilation();
352 public native void unlockCompilation();
353 private native int getMethodEntryBci0(Executable method);
354 public int getMethodEntryBci(Executable method) {
355 Objects.requireNonNull(method);
356 return getMethodEntryBci0(method);
357 }
358 private native Object[] getNMethod0(Executable method, boolean isOsr);
359 public Object[] getNMethod(Executable method, boolean isOsr) {
360 Objects.requireNonNull(method);
361 return getNMethod0(method, isOsr);
362 }
363 public native long allocateCodeBlob(int size, int type);
364 public long allocateCodeBlob(long size, int type) {
365 int intSize = (int) size;
366 if ((long) intSize != size || size < 0) {
367 throw new IllegalArgumentException(
368 "size argument has illegal value " + size);
369 }
370 return allocateCodeBlob( intSize, type);
371 }
372 public native void freeCodeBlob(long addr);
373 public native void forceNMethodSweep();
374 public native Object[] getCodeHeapEntries(int type);
375 public native int getCompilationActivityMode();
376 private native long getMethodData0(Executable method);
377 public long getMethodData(Executable method) {
378 Objects.requireNonNull(method);
379 return getMethodData0(method);
380 }
381 public native Object[] getCodeBlob(long addr);
382
383 private native void clearInlineCaches0(boolean preserve_static_stubs);
384 public void clearInlineCaches() {
385 clearInlineCaches0(false);
386 }
387 public void clearInlineCaches(boolean preserve_static_stubs) {
388 clearInlineCaches0(preserve_static_stubs);
389 }
390
391 // Intered strings
392 public native boolean isInStringTable(String str);
393
394 // Memory
395 public native void readReservedMemory();
396 public native long allocateMetaspace(ClassLoader classLoader, long size);
397 public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
398 public native long incMetaspaceCapacityUntilGC(long increment);
399 public native long metaspaceCapacityUntilGC();
400 public native long metaspaceReserveAlignment();
401
402 // Don't use these methods directly
403 // Use sun.hotspot.gc.GC class instead.
404 public native boolean isGCSupported(int name);
405 public native boolean isGCSelected(int name);
406 public native boolean isGCSelectedErgonomically();
407
408 // Force Young GC
409 public native void youngGC();
410
411 // Force Full GC
412 public native void fullGC();
413
414 // Returns true if the current GC supports concurrent collection control.
415 public native boolean supportsConcurrentGCBreakpoints();
416
417 private void checkConcurrentGCBreakpointsSupported() {
418 if (!supportsConcurrentGCBreakpoints()) {
419 throw new UnsupportedOperationException("Concurrent GC breakpoints not supported");
420 }
421 }
422
423 private native void concurrentGCAcquireControl0();
424 private native void concurrentGCReleaseControl0();
425 private native void concurrentGCRunToIdle0();
426 private native boolean concurrentGCRunTo0(String breakpoint);
427
428 private static boolean concurrentGCIsControlled = false;
429 private void checkConcurrentGCIsControlled() {
430 if (!concurrentGCIsControlled) {
431 throw new IllegalStateException("Not controlling concurrent GC");
432 }
433 }
434
435 // All collectors supporting concurrent GC breakpoints are expected
436 // to provide at least the following breakpoints.
437 public final String AFTER_MARKING_STARTED = "AFTER MARKING STARTED";
438 public final String BEFORE_MARKING_COMPLETED = "BEFORE MARKING COMPLETED";
439
440 public void concurrentGCAcquireControl() {
441 checkConcurrentGCBreakpointsSupported();
442 if (concurrentGCIsControlled) {
443 throw new IllegalStateException("Already controlling concurrent GC");
444 }
445 concurrentGCAcquireControl0();
446 concurrentGCIsControlled = true;
447 }
448
449 public void concurrentGCReleaseControl() {
450 checkConcurrentGCBreakpointsSupported();
451 concurrentGCReleaseControl0();
452 concurrentGCIsControlled = false;
453 }
454
455 // Keep concurrent GC idle. Release from breakpoint.
456 public void concurrentGCRunToIdle() {
457 checkConcurrentGCBreakpointsSupported();
458 checkConcurrentGCIsControlled();
459 concurrentGCRunToIdle0();
460 }
461
462 // Allow concurrent GC to run to breakpoint.
463 // Throws IllegalStateException if reached end of cycle first.
464 public void concurrentGCRunTo(String breakpoint) {
465 concurrentGCRunTo(breakpoint, true);
466 }
467
468 // Allow concurrent GC to run to breakpoint.
469 // Returns true if reached breakpoint. If reached end of cycle first,
470 // then throws IllegalStateException if errorIfFail is true, returning
471 // false otherwise.
472 public boolean concurrentGCRunTo(String breakpoint, boolean errorIfFail) {
473 checkConcurrentGCBreakpointsSupported();
474 checkConcurrentGCIsControlled();
475 if (breakpoint == null) {
476 throw new NullPointerException("null breakpoint");
477 } else if (concurrentGCRunTo0(breakpoint)) {
478 return true;
479 } else if (errorIfFail) {
480 throw new IllegalStateException("Missed requested breakpoint \"" + breakpoint + "\"");
481 } else {
482 return false;
483 }
484 }
485
486 // Method tries to start concurrent mark cycle.
487 // It returns false if CM Thread is always in concurrent cycle.
488 public native boolean g1StartConcMarkCycle();
489
490 // Tests on ReservedSpace/VirtualSpace classes
491 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
492 public native void runMemoryUnitTests();
493 public native void readFromNoaccessArea();
494 public native long getThreadStackSize();
495 public native long getThreadRemainingStackSize();
496
497 // CPU features
498 public native String getCPUFeatures();
499
500 // VM flags
501 public native boolean isConstantVMFlag(String name);
502 public native boolean isLockedVMFlag(String name);
503 public native void setBooleanVMFlag(String name, boolean value);
504 public native void setIntVMFlag(String name, long value);
505 public native void setUintVMFlag(String name, long value);
506 public native void setIntxVMFlag(String name, long value);
507 public native void setUintxVMFlag(String name, long value);
508 public native void setUint64VMFlag(String name, long value);
509 public native void setSizeTVMFlag(String name, long value);
510 public native void setStringVMFlag(String name, String value);
511 public native void setDoubleVMFlag(String name, double value);
512 public native Boolean getBooleanVMFlag(String name);
513 public native Long getIntVMFlag(String name);
514 public native Long getUintVMFlag(String name);
515 public native Long getIntxVMFlag(String name);
516 public native Long getUintxVMFlag(String name);
517 public native Long getUint64VMFlag(String name);
518 public native Long getSizeTVMFlag(String name);
519 public native String getStringVMFlag(String name);
520 public native Double getDoubleVMFlag(String name);
521 private final List<Function<String,Object>> flagsGetters = Arrays.asList(
522 this::getBooleanVMFlag, this::getIntVMFlag, this::getUintVMFlag,
523 this::getIntxVMFlag, this::getUintxVMFlag, this::getUint64VMFlag,
524 this::getSizeTVMFlag, this::getStringVMFlag, this::getDoubleVMFlag);
525
526 public Object getVMFlag(String name) {
527 return flagsGetters.stream()
528 .map(f -> f.apply(name))
529 .filter(x -> x != null)
530 .findAny()
531 .orElse(null);
532 }
533
534 // Jigsaw
535 public native void DefineModule(Object module, boolean is_open, String version,
536 String location, Object[] packages);
537 public native void AddModuleExports(Object from_module, String pkg, Object to_module);
538 public native void AddReadsModule(Object from_module, Object source_module);
539 public native void AddModuleExportsToAllUnnamed(Object module, String pkg);
540 public native void AddModuleExportsToAll(Object module, String pkg);
541
542 public native int getOffsetForName0(String name);
543 public int getOffsetForName(String name) throws Exception {
544 int offset = getOffsetForName0(name);
545 if (offset == -1) {
546 throw new RuntimeException(name + " not found");
547 }
548 return offset;
549 }
550 public native Boolean getMethodBooleanOption(Executable method, String name);
551 public native Long getMethodIntxOption(Executable method, String name);
552 public native Long getMethodUintxOption(Executable method, String name);
553 public native Double getMethodDoubleOption(Executable method, String name);
554 public native String getMethodStringOption(Executable method, String name);
555 private final List<BiFunction<Executable,String,Object>> methodOptionGetters
556 = Arrays.asList(this::getMethodBooleanOption, this::getMethodIntxOption,
557 this::getMethodUintxOption, this::getMethodDoubleOption,
558 this::getMethodStringOption);
559
560 public Object getMethodOption(Executable method, String name) {
561 return methodOptionGetters.stream()
562 .map(f -> f.apply(method, name))
563 .filter(x -> x != null)
564 .findAny()
565 .orElse(null);
566 }
567
568 // Safepoint Checking
569 public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue);
570 public native void assertSpecialLock(boolean allowVMBlock, boolean safepointCheck);
571
572 // Sharing & archiving
573 public native String getDefaultArchivePath();
574 public native boolean cdsMemoryMappingFailed();
575 public native boolean isSharingEnabled();
576 public native boolean isShared(Object o);
577 public native boolean isSharedClass(Class<?> c);
578 public native boolean areSharedStringsIgnored();
579 public native boolean isCDSIncludedInVmBuild();
580 public native boolean isJFRIncludedInVmBuild();
581 public native boolean isJavaHeapArchiveSupported();
582 public native Object getResolvedReferences(Class<?> c);
583 public native void linkClass(Class<?> c);
584 public native boolean areOpenArchiveHeapObjectsMapped();
585
586 // Compiler Directive
587 public native int addCompilerDirective(String compDirect);
588 public native void removeCompilerDirective(int count);
589
590 // Handshakes
591 public native int handshakeWalkStack(Thread t, boolean all_threads);
592
593 // Returns true on linux if library has the noexecstack flag set.
594 public native boolean checkLibSpecifiesNoexecstack(String libfilename);
595
596 // Container testing
597 public native boolean isContainerized();
598 public native int validateCgroup(String procCgroups,
599 String procSelfCgroup,
600 String procSelfMountinfo);
601 public native void printOsInfo();
602
603 // Decoder
604 public native void disableElfSectionCache();
605
606 // Resolved Method Table
607 public native long resolvedMethodItemsCount();
608
609 // Protection Domain Table
610 public native int protectionDomainRemovedCount();
611
612 // Number of loaded AOT libraries
613 public native int aotLibrariesCount();
614
615 public native int getKlassMetadataSize(Class<?> c);
616
617 // ThreadSMR GC safety check for threadObj
618 public native void checkThreadObjOfTerminatingThread(Thread target);
619 }