1 /*
2 * Copyright (c) 1997, 2021, 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,
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20 * or visit www.oracle.com if you need additional information or have any
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23 */
24
25 #ifndef SHARE_RUNTIME_GLOBALS_HPP
26 #define SHARE_RUNTIME_GLOBALS_HPP
27
28 #include "compiler/compiler_globals_pd.hpp"
29 #include "runtime/globals_shared.hpp"
30 #include "utilities/align.hpp"
31 #include "utilities/globalDefinitions.hpp"
32 #include "utilities/macros.hpp"
33 #include CPU_HEADER(globals)
34 #include OS_HEADER(globals)
35 #include OS_CPU_HEADER(globals)
36
37 // develop flags are settable / visible only during development and are constant in the PRODUCT version
38 // product flags are always settable / visible
39 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
40 // develop_pd/product_pd flags are the same as develop/product, except that their default values
41 // are specified in platform-dependent header files.
42
43 // Flags must be declared with the following number of parameters:
44 // non-pd flags:
45 // (type, name, default_value, doc), or
46 // (type, name, default_value, extra_attrs, doc)
47 // pd flags:
48 // (type, name, doc), or
49 // (type, name, extra_attrs, doc)
50
51 // A flag must be declared with one of the following types:
52 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t.
53 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used
54 // only in this file, because the macrology requires single-token type names.
55
56 // The optional extra_attrs parameter may have one of the following values:
57 // DIAGNOSTIC, EXPERIMENTAL, or MANAGEABLE. Currently extra_attrs can be used
58 // only with product/product_pd flags.
59 //
60 // DIAGNOSTIC options are not meant for VM tuning or for product modes.
61 // They are to be used for VM quality assurance or field diagnosis
62 // of VM bugs. They are hidden so that users will not be encouraged to
63 // try them as if they were VM ordinary execution options. However, they
64 // are available in the product version of the VM. Under instruction
65 // from support engineers, VM customers can turn them on to collect
66 // diagnostic information about VM problems. To use a VM diagnostic
67 // option, you must first specify +UnlockDiagnosticVMOptions.
68 // (This master switch also affects the behavior of -Xprintflags.)
69 //
70 // EXPERIMENTAL flags are in support of features that are not
71 // part of the officially supported product, but are available
72 // for experimenting with. They could, for example, be performance
73 // features that may not have undergone full or rigorous QA, but which may
74 // help performance in some cases and released for experimentation
75 // by the community of users and developers. This flag also allows one to
76 // be able to build a fully supported product that nonetheless also
77 // ships with some unsupported, lightly tested, experimental features.
78 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
79 // UnlockExperimentalVMOptions flag, which allows the control and
80 // modification of the experimental flags.
81 //
82 // Nota bene: neither diagnostic nor experimental options should be used casually,
83 // and they are not supported on production loads, except under explicit
84 // direction from support engineers.
85 //
86 // MANAGEABLE flags are writeable external product flags.
87 // They are dynamically writeable through the JDK management interface
88 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
89 // These flags are external exported interface (see CCC). The list of
90 // manageable flags can be queried programmatically through the management
91 // interface.
92 //
93 // A flag can be made as "manageable" only if
94 // - the flag is defined in a CCC as an external exported interface.
95 // - the VM implementation supports dynamic setting of the flag.
96 // This implies that the VM must *always* query the flag variable
97 // and not reuse state related to the flag state at any given time.
98 // - you want the flag to be queried programmatically by the customers.
99 //
100
101 //
102 // range is a macro that will expand to min and max arguments for range
103 // checking code if provided - see jvmFlagLimit.hpp
104 //
105 // constraint is a macro that will expand to custom function call
106 // for constraint checking if provided - see jvmFlagLimit.hpp
107
108 // Default and minimum StringTable and SymbolTable size values
109 // Must be powers of 2
110 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536);
111 const size_t minimumStringTableSize = 128;
112 const size_t defaultSymbolTableSize = 32768; // 2^15
113 const size_t minimumSymbolTableSize = 1024;
114
115 #ifdef _LP64
116 #define LP64_RUNTIME_FLAGS(develop, \
117 develop_pd, \
118 product, \
119 product_pd, \
120 notproduct, \
121 range, \
122 constraint) \
123 \
124 product(bool, UseCompressedOops, false, \
125 "Use 32-bit object references in 64-bit VM. " \
126 "lp64_product means flag is always constant in 32 bit VM") \
127 \
128 product(bool, UseCompressedClassPointers, false, \
129 "Use 32-bit class pointers in 64-bit VM. " \
130 "lp64_product means flag is always constant in 32 bit VM") \
131 \
132 product(intx, ObjectAlignmentInBytes, 8, \
133 "Default object alignment in bytes, 8 is minimum") \
134 range(8, 256) \
135 constraint(ObjectAlignmentInBytesConstraintFunc, AtParse)
136
137 #else
138 // !_LP64
139
140 #define LP64_RUNTIME_FLAGS(develop, \
141 develop_pd, \
142 product, \
143 product_pd, \
144 notproduct, \
145 range, \
146 constraint)
147 const bool UseCompressedOops = false;
148 const bool UseCompressedClassPointers = false;
149 const intx ObjectAlignmentInBytes = 8;
150
151 #endif // _LP64
152
153 #define RUNTIME_FLAGS(develop, \
154 develop_pd, \
155 product, \
156 product_pd, \
157 notproduct, \
158 range, \
159 constraint) \
160 \
161 notproduct(bool, CheckCompressedOops, true, \
162 "Generate checks in encoding/decoding code in debug VM") \
163 \
164 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
165 "Heap allocation steps through preferred address regions to find" \
166 " where it can allocate the heap. Number of steps to take per " \
167 "region.") \
168 range(1, max_uintx) \
169 \
170 product(uint, HandshakeTimeout, 0, DIAGNOSTIC, \
171 "If nonzero set a timeout in milliseconds for handshakes") \
172 \
173 product(bool, AlwaysSafeConstructors, false, EXPERIMENTAL, \
174 "Force safe construction, as if all fields are final.") \
175 \
176 product(bool, UnlockDiagnosticVMOptions, trueInDebug, DIAGNOSTIC, \
177 "Enable normal processing of flags relating to field diagnostics")\
178 \
179 product(bool, UnlockExperimentalVMOptions, false, EXPERIMENTAL, \
180 "Enable normal processing of flags relating to experimental " \
181 "features") \
182 \
183 product(bool, JavaMonitorsInStackTrace, true, \
184 "Print information about Java monitor locks when the stacks are " \
185 "dumped") \
186 \
187 product_pd(bool, UseLargePages, \
188 "Use large page memory") \
189 \
190 product_pd(bool, UseLargePagesIndividualAllocation, \
191 "Allocate large pages individually for better affinity") \
192 \
193 develop(bool, LargePagesIndividualAllocationInjectError, false, \
194 "Fail large pages individual allocation") \
195 \
196 product(bool, UseNUMA, false, \
197 "Use NUMA if available") \
198 \
199 product(bool, UseNUMAInterleaving, false, \
200 "Interleave memory across NUMA nodes if available") \
201 \
202 product(size_t, NUMAInterleaveGranularity, 2*M, \
203 "Granularity to use for NUMA interleaving on Windows OS") \
204 constraint(NUMAInterleaveGranularityConstraintFunc, AtParse) \
205 \
206 product(uintx, NUMAChunkResizeWeight, 20, \
207 "Percentage (0-100) used to weight the current sample when " \
208 "computing exponentially decaying average for " \
209 "AdaptiveNUMAChunkSizing") \
210 range(0, 100) \
211 \
212 product(size_t, NUMASpaceResizeRate, 1*G, \
213 "Do not reallocate more than this amount per collection") \
214 range(0, max_uintx) \
215 \
216 product(bool, UseAdaptiveNUMAChunkSizing, true, \
217 "Enable adaptive chunk sizing for NUMA") \
218 \
219 product(bool, NUMAStats, false, \
220 "Print NUMA stats in detailed heap information") \
221 \
222 product(uintx, NUMAPageScanRate, 256, \
223 "Maximum number of pages to include in the page scan procedure") \
224 range(0, max_uintx) \
225 \
226 product(bool, UseAES, false, \
227 "Control whether AES instructions are used when available") \
228 \
229 product(bool, UseFMA, false, \
230 "Control whether FMA instructions are used when available") \
231 \
232 product(bool, UseSHA, false, \
233 "Control whether SHA instructions are used when available") \
234 \
235 product(bool, UseGHASHIntrinsics, false, DIAGNOSTIC, \
236 "Use intrinsics for GHASH versions of crypto") \
237 \
238 product(bool, UseBASE64Intrinsics, false, \
239 "Use intrinsics for java.util.Base64") \
240 \
241 product(size_t, LargePageSizeInBytes, 0, \
242 "Maximum large page size used (0 will use the default large " \
243 "page size for the environment as the maximum)") \
244 range(0, max_uintx) \
245 \
246 product(size_t, LargePageHeapSizeThreshold, 128*M, \
247 "Use large pages if maximum heap is at least this big") \
248 range(0, max_uintx) \
249 \
250 product(bool, ForceTimeHighResolution, false, \
251 "Using high time resolution (for Win32 only)") \
252 \
253 develop(bool, TracePcPatching, false, \
254 "Trace usage of frame::patch_pc") \
255 \
256 develop(bool, TraceRelocator, false, \
257 "Trace the bytecode relocator") \
258 \
259 \
260 product(bool, SafepointALot, false, DIAGNOSTIC, \
261 "Generate a lot of safepoints. This works with " \
262 "GuaranteedSafepointInterval") \
263 \
264 product(bool, HandshakeALot, false, DIAGNOSTIC, \
265 "Generate a lot of handshakes. This works with " \
266 "GuaranteedSafepointInterval") \
267 \
268 product_pd(bool, BackgroundCompilation, \
269 "A thread requesting compilation is not blocked during " \
270 "compilation") \
271 \
272 product(bool, MethodFlushing, true, \
273 "Reclamation of zombie and not-entrant methods") \
274 \
275 develop(bool, VerifyStack, false, \
276 "Verify stack of each thread when it is entering a runtime call") \
277 \
278 product(bool, ForceUnreachable, false, DIAGNOSTIC, \
279 "Make all non code cache addresses to be unreachable by " \
280 "forcing use of 64bit literal fixups") \
281 \
282 develop(bool, TraceDerivedPointers, false, \
283 "Trace traversal of derived pointers on stack") \
284 \
285 notproduct(bool, TraceCodeBlobStacks, false, \
286 "Trace stack-walk of codeblobs") \
287 \
288 notproduct(bool, PrintRewrites, false, \
289 "Print methods that are being rewritten") \
290 \
291 product(bool, UseInlineCaches, true, \
292 "Use Inline Caches for virtual calls ") \
293 \
294 product(bool, InlineArrayCopy, true, DIAGNOSTIC, \
295 "Inline arraycopy native that is known to be part of " \
296 "base library DLL") \
297 \
298 product(bool, InlineObjectHash, true, DIAGNOSTIC, \
299 "Inline Object::hashCode() native that is known to be part " \
300 "of base library DLL") \
301 \
302 product(bool, InlineNatives, true, DIAGNOSTIC, \
303 "Inline natives that are known to be part of base library DLL") \
304 \
305 product(bool, InlineMathNatives, true, DIAGNOSTIC, \
306 "Inline SinD, CosD, etc.") \
307 \
308 product(bool, InlineClassNatives, true, DIAGNOSTIC, \
309 "Inline Class.isInstance, etc") \
310 \
311 product(bool, InlineThreadNatives, true, DIAGNOSTIC, \
312 "Inline Thread.currentThread, etc") \
313 \
314 product(bool, InlineUnsafeOps, true, DIAGNOSTIC, \
315 "Inline memory ops (native methods) from Unsafe") \
316 \
317 product(bool, CriticalJNINatives, false, \
318 "(Deprecated) Check for critical JNI entry points") \
319 \
320 product(bool, UseAESIntrinsics, false, DIAGNOSTIC, \
321 "Use intrinsics for AES versions of crypto") \
322 \
323 product(bool, UseAESCTRIntrinsics, false, DIAGNOSTIC, \
324 "Use intrinsics for the paralleled version of AES/CTR crypto") \
325 \
326 product(bool, UseMD5Intrinsics, false, DIAGNOSTIC, \
327 "Use intrinsics for MD5 crypto hash function") \
328 \
329 product(bool, UseSHA1Intrinsics, false, DIAGNOSTIC, \
330 "Use intrinsics for SHA-1 crypto hash function. " \
331 "Requires that UseSHA is enabled.") \
332 \
333 product(bool, UseSHA256Intrinsics, false, DIAGNOSTIC, \
334 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
335 "Requires that UseSHA is enabled.") \
336 \
337 product(bool, UseSHA512Intrinsics, false, DIAGNOSTIC, \
338 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
339 "Requires that UseSHA is enabled.") \
340 \
341 product(bool, UseSHA3Intrinsics, false, DIAGNOSTIC, \
342 "Use intrinsics for SHA3 crypto hash function. " \
343 "Requires that UseSHA is enabled.") \
344 \
345 product(bool, UseCRC32Intrinsics, false, DIAGNOSTIC, \
346 "use intrinsics for java.util.zip.CRC32") \
347 \
348 product(bool, UseCRC32CIntrinsics, false, DIAGNOSTIC, \
349 "use intrinsics for java.util.zip.CRC32C") \
350 \
351 product(bool, UseAdler32Intrinsics, false, DIAGNOSTIC, \
352 "use intrinsics for java.util.zip.Adler32") \
353 \
354 product(bool, UseVectorizedMismatchIntrinsic, false, DIAGNOSTIC, \
355 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
356 \
357 product(bool, UseCopySignIntrinsic, false, DIAGNOSTIC, \
358 "Enables intrinsification of Math.copySign") \
359 \
360 product(bool, UseSignumIntrinsic, false, DIAGNOSTIC, \
361 "Enables intrinsification of Math.signum") \
362 \
363 product(ccstrlist, DisableIntrinsic, "", DIAGNOSTIC, \
364 "do not expand intrinsics whose (internal) names appear here") \
365 constraint(DisableIntrinsicConstraintFunc,AfterErgo) \
366 \
367 product(ccstrlist, ControlIntrinsic, "", DIAGNOSTIC, \
368 "Control intrinsics using a list of +/- (internal) names, " \
369 "separated by commas") \
370 constraint(ControlIntrinsicConstraintFunc,AfterErgo) \
371 \
372 develop(bool, TraceCallFixup, false, \
373 "Trace all call fixups") \
374 \
375 develop(bool, DeoptimizeALot, false, \
376 "Deoptimize at every exit from the runtime system") \
377 \
378 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
379 "A comma separated list of bcis to deoptimize at") \
380 \
381 develop(bool, DeoptimizeRandom, false, \
382 "Deoptimize random frames on random exit from the runtime system")\
383 \
384 notproduct(bool, ZombieALot, false, \
385 "Create zombies (non-entrant) at exit from the runtime system") \
386 \
387 notproduct(bool, WalkStackALot, false, \
388 "Trace stack (no print) at every exit from the runtime system") \
389 \
390 develop(bool, DeoptimizeObjectsALot, false, \
391 "For testing purposes concurrent threads revert optimizations " \
392 "based on escape analysis at intervals given with " \
393 "DeoptimizeObjectsALotInterval=n. The thread count is given " \
394 "with DeoptimizeObjectsALotThreadCountSingle and " \
395 "DeoptimizeObjectsALotThreadCountAll.") \
396 \
397 develop(uint64_t, DeoptimizeObjectsALotInterval, 5, \
398 "Interval for DeoptimizeObjectsALot.") \
399 range(0, max_jlong) \
400 \
401 develop(int, DeoptimizeObjectsALotThreadCountSingle, 1, \
402 "The number of threads that revert optimizations based on " \
403 "escape analysis for a single thread if DeoptimizeObjectsALot " \
404 "is enabled. The target thread is selected round robin." ) \
405 range(0, max_jint) \
406 \
407 develop(int, DeoptimizeObjectsALotThreadCountAll, 1, \
408 "The number of threads that revert optimizations based on " \
409 "escape analysis for all threads if DeoptimizeObjectsALot " \
410 "is enabled." ) \
411 range(0, max_jint) \
412 \
413 notproduct(bool, VerifyLastFrame, false, \
414 "Verify oops on last frame on entry to VM") \
415 \
416 product(bool, SafepointTimeout, false, \
417 "Time out and warn or fail after SafepointTimeoutDelay " \
418 "milliseconds if failed to reach safepoint") \
419 \
420 product(bool, AbortVMOnSafepointTimeout, false, DIAGNOSTIC, \
421 "Abort upon failure to reach safepoint (see SafepointTimeout)") \
422 \
423 product(bool, AbortVMOnVMOperationTimeout, false, DIAGNOSTIC, \
424 "Abort upon failure to complete VM operation promptly") \
425 \
426 product(intx, AbortVMOnVMOperationTimeoutDelay, 1000, DIAGNOSTIC, \
427 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \
428 range(0, max_intx) \
429 \
430 product(bool, MaxFDLimit, true, \
431 "Bump the number of file descriptors to maximum (Unix only)") \
432 \
433 product(bool, LogEvents, true, DIAGNOSTIC, \
434 "Enable the various ring buffer event logs") \
435 \
436 product(uintx, LogEventsBufferEntries, 20, DIAGNOSTIC, \
437 "Number of ring buffer event logs") \
438 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
439 \
440 product(bool, BytecodeVerificationRemote, true, DIAGNOSTIC, \
441 "Enable the Java bytecode verifier for remote classes") \
442 \
443 product(bool, BytecodeVerificationLocal, false, DIAGNOSTIC, \
444 "Enable the Java bytecode verifier for local classes") \
445 \
446 develop(bool, VerifyStackAtCalls, false, \
447 "Verify that the stack pointer is unchanged after calls") \
448 \
449 develop(bool, TraceJavaAssertions, false, \
450 "Trace java language assertions") \
451 \
452 notproduct(bool, VerifyCodeCache, false, \
453 "Verify code cache on memory allocation/deallocation") \
454 \
455 develop(bool, UseMallocOnly, false, \
456 "Use only malloc/free for allocation (no resource area/arena). " \
457 "Used to help diagnose memory stomping bugs.") \
458 \
459 develop(bool, ZapResourceArea, trueInDebug, \
460 "Zap freed resource/arena space") \
461 \
462 notproduct(bool, ZapVMHandleArea, trueInDebug, \
463 "Zap freed VM handle space") \
464 \
465 notproduct(bool, ZapStackSegments, trueInDebug, \
466 "Zap allocated/freed stack segments") \
467 \
468 develop(bool, ZapUnusedHeapArea, trueInDebug, \
469 "Zap unused heap space") \
470 \
471 develop(bool, CheckZapUnusedHeapArea, false, \
472 "Check zapping of unused heap space") \
473 \
474 develop(bool, ZapFillerObjects, trueInDebug, \
475 "Zap filler objects") \
476 \
477 product(bool, ExecutingUnitTests, false, \
478 "Whether the JVM is running unit tests or not") \
479 \
480 develop(uintx, ErrorHandlerTest, 0, \
481 "If > 0, provokes an error after VM initialization; the value " \
482 "determines which error to provoke. See controlled_crash() " \
483 "in vmError.cpp.") \
484 range(0, 17) \
485 \
486 develop(uintx, TestCrashInErrorHandler, 0, \
487 "If > 0, provokes an error inside VM error handler (a secondary " \
488 "crash). see controlled_crash() in vmError.cpp") \
489 range(0, 17) \
490 \
491 develop(bool, TestSafeFetchInErrorHandler, false , \
492 "If true, tests SafeFetch inside error handler.") \
493 \
494 develop(bool, TestUnresponsiveErrorHandler, false, \
495 "If true, simulates an unresponsive error handler.") \
496 \
497 develop(bool, Verbose, false, \
498 "Print additional debugging information from other modes") \
499 \
500 develop(bool, PrintMiscellaneous, false, \
501 "Print uncategorized debugging information (requires +Verbose)") \
502 \
503 develop(bool, WizardMode, false, \
504 "Print much more debugging information") \
505 \
506 product(bool, ShowMessageBoxOnError, false, \
507 "Keep process alive on VM fatal error") \
508 \
509 product(bool, CreateCoredumpOnCrash, true, \
510 "Create core/mini dump on VM fatal error") \
511 \
512 product(uint64_t, ErrorLogTimeout, 2 * 60, \
513 "Timeout, in seconds, to limit the time spent on writing an " \
514 "error log in case of a crash.") \
515 range(0, (uint64_t)max_jlong/1000) \
516 \
517 product(bool, SuppressFatalErrorMessage, false, \
518 "Report NO fatal error message (avoid deadlock)") \
519 \
520 product(ccstrlist, OnError, "", \
521 "Run user-defined commands on fatal error; see VMError.cpp " \
522 "for examples") \
523 \
524 product(ccstrlist, OnOutOfMemoryError, "", \
525 "Run user-defined commands on first java.lang.OutOfMemoryError " \
526 "thrown from JVM") \
527 \
528 product(bool, HeapDumpBeforeFullGC, false, MANAGEABLE, \
529 "Dump heap to file before any major stop-the-world GC") \
530 \
531 product(bool, HeapDumpAfterFullGC, false, MANAGEABLE, \
532 "Dump heap to file after any major stop-the-world GC") \
533 \
534 product(bool, HeapDumpOnOutOfMemoryError, false, MANAGEABLE, \
535 "Dump heap to file when java.lang.OutOfMemoryError is thrown " \
536 "from JVM") \
537 \
538 product(ccstr, HeapDumpPath, NULL, MANAGEABLE, \
539 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
540 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
541 "in the working directory)") \
542 \
543 product(intx, HeapDumpGzipLevel, 0, MANAGEABLE, \
544 "When HeapDumpOnOutOfMemoryError is on, the gzip compression " \
545 "level of the dump file. 0 (the default) disables gzip " \
546 "compression. Otherwise the level must be between 1 and 9.") \
547 range(0, 9) \
548 \
549 product(ccstr, NativeMemoryTracking, "off", \
550 "Native memory tracking options") \
551 \
552 product(bool, PrintNMTStatistics, false, DIAGNOSTIC, \
553 "Print native memory tracking summary data if it is on") \
554 \
555 product(bool, LogCompilation, false, DIAGNOSTIC, \
556 "Log compilation activity in detail to LogFile") \
557 \
558 product(bool, PrintCompilation, false, \
559 "Print compilations") \
560 \
561 product(intx, RepeatCompilation, 0, DIAGNOSTIC, \
562 "Repeat compilation without installing code (number of times)") \
563 range(0, max_jint) \
564 \
565 product(bool, PrintExtendedThreadInfo, false, \
566 "Print more information in thread dump") \
567 \
568 product(intx, ScavengeRootsInCode, 2, DIAGNOSTIC, \
569 "0: do not allow scavengable oops in the code cache; " \
570 "1: allow scavenging from the code cache; " \
571 "2: emit as many constants as the compiler can see") \
572 range(0, 2) \
573 \
574 product(bool, AlwaysRestoreFPU, false, \
575 "Restore the FPU control word after every JNI call (expensive)") \
576 \
577 product(bool, PrintCompilation2, false, DIAGNOSTIC, \
578 "Print additional statistics per compilation") \
579 \
580 product(bool, PrintAdapterHandlers, false, DIAGNOSTIC, \
581 "Print code generated for i2c/c2i adapters") \
582 \
583 product(bool, VerifyAdapterCalls, trueInDebug, DIAGNOSTIC, \
584 "Verify that i2c/c2i adapters are called properly") \
585 \
586 develop(bool, VerifyAdapterSharing, false, \
587 "Verify that the code for shared adapters is the equivalent") \
588 \
589 product(bool, PrintAssembly, false, DIAGNOSTIC, \
590 "Print assembly code (using external disassembler.so)") \
591 \
592 product(ccstr, PrintAssemblyOptions, NULL, DIAGNOSTIC, \
593 "Print options string passed to disassembler.so") \
594 \
595 notproduct(bool, PrintNMethodStatistics, false, \
596 "Print a summary statistic for the generated nmethods") \
597 \
598 product(bool, PrintNMethods, false, DIAGNOSTIC, \
599 "Print assembly code for nmethods when generated") \
600 \
601 product(bool, PrintNativeNMethods, false, DIAGNOSTIC, \
602 "Print assembly code for native nmethods when generated") \
603 \
604 develop(bool, PrintDebugInfo, false, \
605 "Print debug information for all nmethods when generated") \
606 \
607 develop(bool, PrintRelocations, false, \
608 "Print relocation information for all nmethods when generated") \
609 \
610 develop(bool, PrintDependencies, false, \
611 "Print dependency information for all nmethods when generated") \
612 \
613 develop(bool, PrintExceptionHandlers, false, \
614 "Print exception handler tables for all nmethods when generated") \
615 \
616 develop(bool, StressCompiledExceptionHandlers, false, \
617 "Exercise compiled exception handlers") \
618 \
619 develop(bool, InterceptOSException, false, \
620 "Start debugger when an implicit OS (e.g. NULL) " \
621 "exception happens") \
622 \
623 product(bool, PrintCodeCache, false, \
624 "Print the code cache memory usage when exiting") \
625 \
626 develop(bool, PrintCodeCache2, false, \
627 "Print detailed usage information on the code cache when exiting")\
628 \
629 product(bool, PrintCodeCacheOnCompilation, false, \
630 "Print the code cache memory usage each time a method is " \
631 "compiled") \
632 \
633 product(bool, PrintCodeHeapAnalytics, false, DIAGNOSTIC, \
634 "Print code heap usage statistics on exit and on full condition") \
635 \
636 product(bool, PrintStubCode, false, DIAGNOSTIC, \
637 "Print generated stub code") \
638 \
639 product(bool, StackTraceInThrowable, true, \
640 "Collect backtrace in throwable when exception happens") \
641 \
642 product(bool, OmitStackTraceInFastThrow, true, \
643 "Omit backtraces for some 'hot' exceptions in optimized code") \
644 \
645 product(bool, ShowCodeDetailsInExceptionMessages, true, MANAGEABLE, \
646 "Show exception messages from RuntimeExceptions that contain " \
647 "snippets of the failing code. Disable this to improve privacy.") \
648 \
649 product(bool, PrintWarnings, true, \
650 "Print JVM warnings to output stream") \
651 \
652 product(bool, RegisterFinalizersAtInit, true, \
653 "Register finalizable objects at end of Object.<init> or " \
654 "after allocation") \
655 \
656 develop(bool, RegisterReferences, true, \
657 "Tell whether the VM should register soft/weak/final/phantom " \
658 "references") \
659 \
660 develop(bool, PrintCodeCacheExtension, false, \
661 "Print extension of code cache") \
662 \
663 develop(bool, UsePrivilegedStack, true, \
664 "Enable the security JVM functions") \
665 \
666 product(bool, ClassUnloading, true, \
667 "Do unloading of classes") \
668 \
669 product(bool, ClassUnloadingWithConcurrentMark, true, \
670 "Do unloading of classes with a concurrent marking cycle") \
671 \
672 notproduct(bool, PrintSystemDictionaryAtExit, false, \
673 "Print the system dictionary at exit") \
674 \
675 notproduct(bool, PrintClassLoaderDataGraphAtExit, false, \
676 "Print the class loader data graph at exit") \
677 \
678 product(bool, DynamicallyResizeSystemDictionaries, true, DIAGNOSTIC, \
679 "Dynamically resize system dictionaries as needed") \
680 \
681 product(bool, AllowParallelDefineClass, false, \
682 "Allow parallel defineClass requests for class loaders " \
683 "registering as parallel capable") \
684 \
685 product_pd(bool, DontYieldALot, \
686 "Throw away obvious excess yield calls") \
687 \
688 product(bool, DisablePrimordialThreadGuardPages, false, EXPERIMENTAL, \
689 "Disable the use of stack guard pages if the JVM is loaded " \
690 "on the primordial process thread") \
691 \
692 /* notice: the max range value here is max_jint, not max_intx */ \
693 /* because of overflow issue */ \
694 product(intx, AsyncDeflationInterval, 250, DIAGNOSTIC, \
695 "Async deflate idle monitors every so many milliseconds when " \
696 "MonitorUsedDeflationThreshold is exceeded (0 is off).") \
697 range(0, max_jint) \
698 \
699 product(size_t, AvgMonitorsPerThreadEstimate, 1024, DIAGNOSTIC, \
700 "Used to estimate a variable ceiling based on number of threads " \
701 "for use with MonitorUsedDeflationThreshold (0 is off).") \
702 range(0, max_uintx) \
703 \
704 /* notice: the max range value here is max_jint, not max_intx */ \
705 /* because of overflow issue */ \
706 product(intx, MonitorDeflationMax, 1000000, DIAGNOSTIC, \
707 "The maximum number of monitors to deflate, unlink and delete " \
708 "at one time (minimum is 1024).") \
709 range(1024, max_jint) \
710 \
711 product(intx, MonitorUsedDeflationThreshold, 90, DIAGNOSTIC, \
712 "Percentage of used monitors before triggering deflation (0 is " \
713 "off). The check is performed on GuaranteedSafepointInterval " \
714 "or AsyncDeflationInterval.") \
715 range(0, 100) \
716 \
717 product(uintx, NoAsyncDeflationProgressMax, 3, DIAGNOSTIC, \
718 "Max number of no progress async deflation attempts to tolerate " \
719 "before adjusting the in_use_list_ceiling up (0 is off).") \
720 range(0, max_uintx) \
721 \
722 product(intx, hashCode, 5, EXPERIMENTAL, \
723 "(Unstable) select hashCode generation algorithm") \
724 \
725 product(bool, FilterSpuriousWakeups, true, \
726 "(Deprecated) When true prevents OS-level spurious, or premature,"\
727 " wakeups from Object.wait (Ignored for Windows)") \
728 \
729 product(bool, ReduceSignalUsage, false, \
730 "Reduce the use of OS signals in Java and/or the VM") \
731 \
732 develop(bool, LoadLineNumberTables, true, \
733 "Tell whether the class file parser loads line number tables") \
734 \
735 develop(bool, LoadLocalVariableTables, true, \
736 "Tell whether the class file parser loads local variable tables") \
737 \
738 develop(bool, LoadLocalVariableTypeTables, true, \
739 "Tell whether the class file parser loads local variable type" \
740 "tables") \
741 \
742 product(bool, AllowUserSignalHandlers, false, \
743 "Application will install primary signal handlers for the JVM " \
744 "(Unix only)") \
745 \
746 product(bool, UseSignalChaining, true, \
747 "Use signal-chaining to invoke signal handlers installed " \
748 "by the application (Unix only)") \
749 \
750 product(bool, RestoreMXCSROnJNICalls, false, \
751 "Restore MXCSR when returning from JNI calls") \
752 \
753 product(bool, CheckJNICalls, false, \
754 "Verify all arguments to JNI calls") \
755 \
756 product(bool, UseFastJNIAccessors, true, \
757 "Use optimized versions of Get<Primitive>Field") \
758 \
759 product(intx, MaxJNILocalCapacity, 65536, \
760 "Maximum allowable local JNI handle capacity to " \
761 "EnsureLocalCapacity() and PushLocalFrame(), " \
762 "where <= 0 is unlimited, default: 65536") \
763 range(min_intx, max_intx) \
764 \
765 product(bool, EagerXrunInit, false, \
766 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
767 "but not all -Xrun libraries may support the state of the VM " \
768 "at this time") \
769 \
770 product(bool, PreserveAllAnnotations, false, \
771 "Preserve RuntimeInvisibleAnnotations as well " \
772 "as RuntimeVisibleAnnotations") \
773 \
774 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
775 "Number of OutOfMemoryErrors preallocated with backtrace") \
776 \
777 product(bool, UseXMMForArrayCopy, false, \
778 "Use SSE2 MOVQ instruction for Arraycopy") \
779 \
780 notproduct(bool, PrintFieldLayout, false, \
781 "Print field layout for each class") \
782 \
783 notproduct(bool, PrintInlineLayout, false, \
784 "Print field layout for each inline type") \
785 \
786 notproduct(bool, PrintFlatArrayLayout, false, \
787 "Print array layout for each inline type array") \
788 \
789 product(intx, FlatArrayElementMaxSize, -1, \
790 "Max size for flattening inline array elements, <0 no limit") \
791 \
792 product(intx, InlineFieldMaxFlatSize, 128, \
793 "Max size for flattening inline type fields, <0 no limit") \
794 \
795 product(intx, FlatArrayElementMaxOops, 4, \
796 "Max nof embedded object references in an inline type to flatten, <0 no limit") \
797 \
798 product(bool, InlineArrayAtomicAccess, false, \
799 "Atomic inline array accesses by-default, for all inline arrays") \
800 \
801 /* Need to limit the extent of the padding to reasonable size. */\
802 /* 8K is well beyond the reasonable HW cache line size, even with */\
803 /* aggressive prefetching, while still leaving the room for segregating */\
804 /* among the distinct pages. */\
805 product(intx, ContendedPaddingWidth, 128, \
806 "How many bytes to pad the fields/classes marked @Contended with")\
807 range(0, 8192) \
808 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
809 \
810 product(bool, EnableContended, true, \
811 "Enable @Contended annotation support") \
812 \
813 product(bool, RestrictContended, true, \
814 "Restrict @Contended to trusted classes") \
815 \
816 product(intx, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \
817 "Detect and take action upon identifying synchronization on " \
818 "value based classes. Modes: " \
819 "0: off; " \
820 "1: exit with fatal error; " \
821 "2: log message to stdout. Output file can be specified with " \
822 " -Xlog:valuebasedclasses. If JFR is running it will " \
823 " also generate JFR events.") \
824 range(0, 2) \
825 \
826 product(bool, ExitOnOutOfMemoryError, false, \
827 "JVM exits on the first occurrence of an out-of-memory error " \
828 "thrown from JVM") \
829 \
830 product(bool, CrashOnOutOfMemoryError, false, \
831 "JVM aborts, producing an error log and core/mini dump, on the " \
832 "first occurrence of an out-of-memory error thrown from JVM") \
833 \
834 /* tracing */ \
835 \
836 develop(bool, StressRewriter, false, \
837 "Stress linktime bytecode rewriting") \
838 \
839 product(ccstr, TraceJVMTI, NULL, \
840 "Trace flags for JVMTI functions and events") \
841 \
842 product(bool, StressLdcRewrite, false, DIAGNOSTIC, \
843 "Force ldc -> ldc_w rewrite during RedefineClasses. " \
844 "This option can change an EMCP method into an obsolete method " \
845 "and can affect tests that expect specific methods to be EMCP. " \
846 "This option should be used with caution.") \
847 \
848 product(bool, AllowRedefinitionToAddDeleteMethods, false, \
849 "(Deprecated) Allow redefinition to add and delete private " \
850 "static or final methods for compatibility with old releases") \
851 \
852 develop(bool, TraceBytecodes, false, \
853 "Trace bytecode execution") \
854 \
855 develop(bool, TraceICs, false, \
856 "Trace inline cache changes") \
857 \
858 notproduct(bool, TraceInvocationCounterOverflow, false, \
859 "Trace method invocation counter overflow") \
860 \
861 develop(bool, TraceInlineCacheClearing, false, \
862 "Trace clearing of inline caches in nmethods") \
863 \
864 develop(bool, TraceDependencies, false, \
865 "Trace dependencies") \
866 \
867 develop(bool, VerifyDependencies, trueInDebug, \
868 "Exercise and verify the compilation dependency mechanism") \
869 \
870 develop(bool, TraceNewOopMapGeneration, false, \
871 "Trace OopMapGeneration") \
872 \
873 develop(bool, TraceNewOopMapGenerationDetailed, false, \
874 "Trace OopMapGeneration: print detailed cell states") \
875 \
876 develop(bool, TimeOopMap, false, \
877 "Time calls to GenerateOopMap::compute_map() in sum") \
878 \
879 develop(bool, TimeOopMap2, false, \
880 "Time calls to GenerateOopMap::compute_map() individually") \
881 \
882 develop(bool, TraceOopMapRewrites, false, \
883 "Trace rewriting of methods during oop map generation") \
884 \
885 develop(bool, TraceICBuffer, false, \
886 "Trace usage of IC buffer") \
887 \
888 develop(bool, TraceCompiledIC, false, \
889 "Trace changes of compiled IC") \
890 \
891 develop(bool, FLSVerifyDictionary, false, \
892 "Do lots of (expensive) FLS dictionary verification") \
893 \
894 \
895 notproduct(bool, CheckMemoryInitialization, false, \
896 "Check memory initialization") \
897 \
898 product(uintx, ProcessDistributionStride, 4, \
899 "Stride through processors when distributing processes") \
900 range(0, max_juint) \
901 \
902 develop(bool, TraceFinalizerRegistration, false, \
903 "Trace registration of final references") \
904 \
905 product(bool, IgnoreEmptyClassPaths, false, \
906 "Ignore empty path elements in -classpath") \
907 \
908 product(bool, PrintHeapAtSIGBREAK, true, \
909 "Print heap layout in response to SIGBREAK") \
910 \
911 product(bool, PrintClassHistogram, false, MANAGEABLE, \
912 "Print a histogram of class instances") \
913 \
914 product(double, ObjectCountCutOffPercent, 0.5, EXPERIMENTAL, \
915 "The percentage of the used heap that the instances of a class " \
916 "must occupy for the class to generate a trace event") \
917 range(0.0, 100.0) \
918 \
919 /* JVMTI heap profiling */ \
920 \
921 product(bool, VerifyBeforeIteration, false, DIAGNOSTIC, \
922 "Verify memory system before JVMTI iteration") \
923 \
924 /* compiler */ \
925 \
926 /* notice: the max range value here is max_jint, not max_intx */ \
927 /* because of overflow issue */ \
928 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
929 "Number of compiler threads to run") \
930 range(0, max_jint) \
931 constraint(CICompilerCountConstraintFunc, AfterErgo) \
932 \
933 product(bool, UseDynamicNumberOfCompilerThreads, true, \
934 "Dynamically choose the number of parallel compiler threads") \
935 \
936 product(bool, ReduceNumberOfCompilerThreads, true, DIAGNOSTIC, \
937 "Reduce the number of parallel compiler threads when they " \
938 "are not used") \
939 \
940 product(bool, TraceCompilerThreads, false, DIAGNOSTIC, \
941 "Trace creation and removal of compiler threads") \
942 \
943 develop(bool, InjectCompilerCreationFailure, false, \
944 "Inject thread creation failures for " \
945 "UseDynamicNumberOfCompilerThreads") \
946 \
947 develop(bool, GenerateSynchronizationCode, true, \
948 "generate locking/unlocking code for synchronized methods and " \
949 "monitors") \
950 \
951 develop(bool, GenerateRangeChecks, true, \
952 "Generate range checks for array accesses") \
953 \
954 product_pd(bool, ImplicitNullChecks, DIAGNOSTIC, \
955 "Generate code for implicit null checks") \
956 \
957 product_pd(bool, TrapBasedNullChecks, \
958 "Generate code for null checks that uses a cmp and trap " \
959 "instruction raising SIGTRAP. This is only used if an access to" \
960 "null (+offset) will not raise a SIGSEGV, i.e.," \
961 "ImplicitNullChecks don't work (PPC64).") \
962 \
963 product(bool, EnableThreadSMRExtraValidityChecks, true, DIAGNOSTIC, \
964 "Enable Thread SMR extra validity checks") \
965 \
966 product(bool, EnableThreadSMRStatistics, trueInDebug, DIAGNOSTIC, \
967 "Enable Thread SMR Statistics") \
968 \
969 product(bool, UseNotificationThread, true, \
970 "Use Notification Thread") \
971 \
972 product(bool, Inline, true, \
973 "Enable inlining") \
974 \
975 product(bool, ClipInlining, true, \
976 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
977 \
978 develop(bool, UseCHA, true, \
979 "Enable CHA") \
980 \
981 product(bool, UseVtableBasedCHA, true, DIAGNOSTIC, \
982 "Use vtable information during CHA") \
983 \
984 product(bool, UseTypeProfile, true, \
985 "Check interpreter profile for historically monomorphic calls") \
986 \
987 product(bool, PrintInlining, false, DIAGNOSTIC, \
988 "Print inlining optimizations") \
989 \
990 product(bool, UsePopCountInstruction, false, \
991 "Use population count instruction") \
992 \
993 develop(bool, EagerInitialization, false, \
994 "Eagerly initialize classes if possible") \
995 \
996 product(bool, LogTouchedMethods, false, DIAGNOSTIC, \
997 "Log methods which have been ever touched in runtime") \
998 \
999 product(bool, PrintTouchedMethodsAtExit, false, DIAGNOSTIC, \
1000 "Print all methods that have been ever touched in runtime") \
1001 \
1002 develop(bool, TraceMethodReplacement, false, \
1003 "Print when methods are replaced do to recompilation") \
1004 \
1005 develop(bool, PrintMethodFlushing, false, \
1006 "Print the nmethods being flushed") \
1007 \
1008 product(bool, PrintMethodFlushingStatistics, false, DIAGNOSTIC, \
1009 "print statistics about method flushing") \
1010 \
1011 product(intx, HotMethodDetectionLimit, 100000, DIAGNOSTIC, \
1012 "Number of compiled code invocations after which " \
1013 "the method is considered as hot by the flusher") \
1014 range(1, max_jint) \
1015 \
1016 product(intx, MinPassesBeforeFlush, 10, DIAGNOSTIC, \
1017 "Minimum number of sweeper passes before an nmethod " \
1018 "can be flushed") \
1019 range(0, max_intx) \
1020 \
1021 product(bool, UseCodeAging, true, \
1022 "Insert counter to detect warm methods") \
1023 \
1024 product(bool, StressCodeAging, false, DIAGNOSTIC, \
1025 "Start with counters compiled in") \
1026 \
1027 develop(bool, StressCodeBuffers, false, \
1028 "Exercise code buffer expansion and other rare state changes") \
1029 \
1030 product(bool, DebugNonSafepoints, trueInDebug, DIAGNOSTIC, \
1031 "Generate extra debugging information for non-safepoints in " \
1032 "nmethods") \
1033 \
1034 product(bool, PrintVMOptions, false, \
1035 "Print flags that appeared on the command line") \
1036 \
1037 product(bool, IgnoreUnrecognizedVMOptions, false, \
1038 "Ignore unrecognized VM options") \
1039 \
1040 product(bool, PrintCommandLineFlags, false, \
1041 "Print flags specified on command line or set by ergonomics") \
1042 \
1043 product(bool, PrintFlagsInitial, false, \
1044 "Print all VM flags before argument processing and exit VM") \
1045 \
1046 product(bool, PrintFlagsFinal, false, \
1047 "Print all VM flags after argument and ergonomic processing") \
1048 \
1049 notproduct(bool, PrintFlagsWithComments, false, \
1050 "Print all VM flags with default values and descriptions and " \
1051 "exit") \
1052 \
1053 product(bool, PrintFlagsRanges, false, \
1054 "Print VM flags and their ranges") \
1055 \
1056 product(bool, SerializeVMOutput, true, DIAGNOSTIC, \
1057 "Use a mutex to serialize output to tty and LogFile") \
1058 \
1059 product(bool, DisplayVMOutput, true, DIAGNOSTIC, \
1060 "Display all VM output on the tty, independently of LogVMOutput") \
1061 \
1062 product(bool, LogVMOutput, false, DIAGNOSTIC, \
1063 "Save VM output to LogFile") \
1064 \
1065 product(ccstr, LogFile, NULL, DIAGNOSTIC, \
1066 "If LogVMOutput or LogCompilation is on, save VM output to " \
1067 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1068 \
1069 product(ccstr, ErrorFile, NULL, \
1070 "If an error occurs, save the error data to this file " \
1071 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
1072 \
1073 product(bool, ExtensiveErrorReports, \
1074 PRODUCT_ONLY(false) NOT_PRODUCT(true), \
1075 "Error reports are more extensive.") \
1076 \
1077 product(bool, DisplayVMOutputToStderr, false, \
1078 "If DisplayVMOutput is true, display all VM output to stderr") \
1079 \
1080 product(bool, DisplayVMOutputToStdout, false, \
1081 "If DisplayVMOutput is true, display all VM output to stdout") \
1082 \
1083 product(bool, ErrorFileToStderr, false, \
1084 "If true, error data is printed to stderr instead of a file") \
1085 \
1086 product(bool, ErrorFileToStdout, false, \
1087 "If true, error data is printed to stdout instead of a file") \
1088 \
1089 product(bool, UseHeavyMonitors, false, \
1090 "use heavyweight instead of lightweight Java monitors") \
1091 \
1092 product(bool, PrintStringTableStatistics, false, \
1093 "print statistics about the StringTable and SymbolTable") \
1094 \
1095 product(bool, VerifyStringTableAtExit, false, DIAGNOSTIC, \
1096 "verify StringTable contents at exit") \
1097 \
1098 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
1099 "print histogram of the symbol table") \
1100 \
1101 product(ccstr, AbortVMOnException, NULL, DIAGNOSTIC, \
1102 "Call fatal if this exception is thrown. Example: " \
1103 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1104 \
1105 product(ccstr, AbortVMOnExceptionMessage, NULL, DIAGNOSTIC, \
1106 "Call fatal if the exception pointed by AbortVMOnException " \
1107 "has this message") \
1108 \
1109 develop(bool, DebugVtables, false, \
1110 "add debugging code to vtable dispatch") \
1111 \
1112 notproduct(bool, PrintVtableStats, false, \
1113 "print vtables stats at end of run") \
1114 \
1115 develop(bool, TraceCreateZombies, false, \
1116 "trace creation of zombie nmethods") \
1117 \
1118 product(bool, RangeCheckElimination, true, \
1119 "Eliminate range checks") \
1120 \
1121 develop_pd(bool, UncommonNullCast, \
1122 "track occurrences of null in casts; adjust compiler tactics") \
1123 \
1124 develop(bool, TypeProfileCasts, true, \
1125 "treat casts like calls for purposes of type profiling") \
1126 \
1127 develop(bool, TraceLivenessGen, false, \
1128 "Trace the generation of liveness analysis information") \
1129 \
1130 notproduct(bool, TraceLivenessQuery, false, \
1131 "Trace queries of liveness analysis information") \
1132 \
1133 notproduct(bool, CollectIndexSetStatistics, false, \
1134 "Collect information about IndexSets") \
1135 \
1136 develop(intx, FastAllocateSizeLimit, 128*K, \
1137 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
1138 "Inline allocations larger than this in doublewords must go slow")\
1139 \
1140 product_pd(bool, CompactStrings, \
1141 "Enable Strings to use single byte chars in backing store") \
1142 \
1143 product_pd(uintx, TypeProfileLevel, \
1144 "=XYZ, with Z: Type profiling of arguments at call; " \
1145 "Y: Type profiling of return value at call; " \
1146 "X: Type profiling of parameters to methods; " \
1147 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
1148 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
1149 \
1150 product(intx, TypeProfileArgsLimit, 2, \
1151 "max number of call arguments to consider for type profiling") \
1152 range(0, 16) \
1153 \
1154 product(intx, TypeProfileParmsLimit, 2, \
1155 "max number of incoming parameters to consider for type profiling"\
1156 ", -1 for all") \
1157 range(-1, 64) \
1158 \
1159 /* statistics */ \
1160 develop(bool, CountCompiledCalls, false, \
1161 "Count method invocations") \
1162 \
1163 notproduct(bool, ICMissHistogram, false, \
1164 "Produce histogram of IC misses") \
1165 \
1166 /* interpreter */ \
1167 product_pd(bool, RewriteBytecodes, \
1168 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
1169 \
1170 product_pd(bool, RewriteFrequentPairs, \
1171 "Rewrite frequently used bytecode pairs into a single bytecode") \
1172 \
1173 product(bool, PrintInterpreter, false, DIAGNOSTIC, \
1174 "Print the generated interpreter code") \
1175 \
1176 product(bool, UseInterpreter, true, \
1177 "Use interpreter for non-compiled methods") \
1178 \
1179 develop(bool, UseFastSignatureHandlers, true, \
1180 "Use fast signature handlers for native calls") \
1181 \
1182 product(bool, UseLoopCounter, true, \
1183 "Increment invocation counter on backward branch") \
1184 \
1185 product_pd(bool, UseOnStackReplacement, \
1186 "Use on stack replacement, calls runtime if invoc. counter " \
1187 "overflows in loop") \
1188 \
1189 notproduct(bool, TraceOnStackReplacement, false, \
1190 "Trace on stack replacement") \
1191 \
1192 product_pd(bool, PreferInterpreterNativeStubs, \
1193 "Use always interpreter stubs for native methods invoked via " \
1194 "interpreter") \
1195 \
1196 develop(bool, CountBytecodes, false, \
1197 "Count number of bytecodes executed") \
1198 \
1199 develop(bool, PrintBytecodeHistogram, false, \
1200 "Print histogram of the executed bytecodes") \
1201 \
1202 develop(bool, PrintBytecodePairHistogram, false, \
1203 "Print histogram of the executed bytecode pairs") \
1204 \
1205 product(bool, PrintSignatureHandlers, false, DIAGNOSTIC, \
1206 "Print code generated for native method signature handlers") \
1207 \
1208 develop(bool, VerifyOops, false, \
1209 "Do plausibility checks for oops") \
1210 \
1211 develop(bool, CheckUnhandledOops, false, \
1212 "Check for unhandled oops in VM code") \
1213 \
1214 develop(bool, VerifyJNIFields, trueInDebug, \
1215 "Verify jfieldIDs for instance fields") \
1216 \
1217 notproduct(bool, VerifyJNIEnvThread, false, \
1218 "Verify JNIEnv.thread == Thread::current() when entering VM " \
1219 "from JNI") \
1220 \
1221 develop(bool, VerifyFPU, false, \
1222 "Verify FPU state (check for NaN's, etc.)") \
1223 \
1224 develop(bool, VerifyThread, false, \
1225 "Watch the thread register for corruption (SPARC only)") \
1226 \
1227 develop(bool, VerifyActivationFrameSize, false, \
1228 "Verify that activation frame didn't become smaller than its " \
1229 "minimal size") \
1230 \
1231 develop(bool, TraceFrequencyInlining, false, \
1232 "Trace frequency based inlining") \
1233 \
1234 develop_pd(bool, InlineIntrinsics, \
1235 "Inline intrinsics that can be statically resolved") \
1236 \
1237 product_pd(bool, ProfileInterpreter, \
1238 "Profile at the bytecode level during interpretation") \
1239 \
1240 develop_pd(bool, ProfileTraps, \
1241 "Profile deoptimization traps at the bytecode level") \
1242 \
1243 product(intx, ProfileMaturityPercentage, 20, \
1244 "number of method invocations/branches (expressed as % of " \
1245 "CompileThreshold) before using the method's profile") \
1246 range(0, 100) \
1247 \
1248 product(bool, PrintMethodData, false, DIAGNOSTIC, \
1249 "Print the results of +ProfileInterpreter at end of run") \
1250 \
1251 develop(bool, VerifyDataPointer, trueInDebug, \
1252 "Verify the method data pointer during interpreter profiling") \
1253 \
1254 notproduct(bool, CrashGCForDumpingJavaThread, false, \
1255 "Manually make GC thread crash then dump java stack trace; " \
1256 "Test only") \
1257 \
1258 /* compilation */ \
1259 product(bool, UseCompiler, true, \
1260 "Use Just-In-Time compilation") \
1261 \
1262 product(bool, UseCounterDecay, true, \
1263 "Adjust recompilation counters") \
1264 \
1265 develop(intx, CounterHalfLifeTime, 30, \
1266 "Half-life time of invocation counters (in seconds)") \
1267 \
1268 develop(intx, CounterDecayMinIntervalLength, 500, \
1269 "The minimum interval (in milliseconds) between invocation of " \
1270 "CounterDecay") \
1271 \
1272 product(bool, AlwaysCompileLoopMethods, false, \
1273 "When using recompilation, never interpret methods " \
1274 "containing loops") \
1275 \
1276 product(intx, AllocatePrefetchStyle, 1, \
1277 "0 = no prefetch, " \
1278 "1 = generate prefetch instructions for each allocation, " \
1279 "2 = use TLAB watermark to gate allocation prefetch, " \
1280 "3 = generate one prefetch instruction per cache line") \
1281 range(0, 3) \
1282 \
1283 product(intx, AllocatePrefetchDistance, -1, \
1284 "Distance to prefetch ahead of allocation pointer. " \
1285 "-1: use system-specific value (automatically determined") \
1286 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\
1287 \
1288 product(intx, AllocatePrefetchLines, 3, \
1289 "Number of lines to prefetch ahead of array allocation pointer") \
1290 range(1, 64) \
1291 \
1292 product(intx, AllocateInstancePrefetchLines, 1, \
1293 "Number of lines to prefetch ahead of instance allocation " \
1294 "pointer") \
1295 range(1, 64) \
1296 \
1297 product(intx, AllocatePrefetchStepSize, 16, \
1298 "Step size in bytes of sequential prefetch instructions") \
1299 range(1, 512) \
1300 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1301 \
1302 product(intx, AllocatePrefetchInstr, 0, \
1303 "Select instruction to prefetch ahead of allocation pointer") \
1304 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
1305 \
1306 /* deoptimization */ \
1307 develop(bool, TraceDeoptimization, false, \
1308 "Trace deoptimization") \
1309 \
1310 develop(bool, PrintDeoptimizationDetails, false, \
1311 "Print more information about deoptimization") \
1312 \
1313 develop(bool, DebugDeoptimization, false, \
1314 "Tracing various information while debugging deoptimization") \
1315 \
1316 product(intx, SelfDestructTimer, 0, \
1317 "Will cause VM to terminate after a given time (in minutes) " \
1318 "(0 means off)") \
1319 range(0, max_intx) \
1320 \
1321 product(intx, MaxJavaStackTraceDepth, 1024, \
1322 "The maximum number of lines in the stack trace for Java " \
1323 "exceptions (0 means all)") \
1324 range(0, max_jint/2) \
1325 \
1326 /* notice: the max range value here is max_jint, not max_intx */ \
1327 /* because of overflow issue */ \
1328 product(intx, GuaranteedSafepointInterval, 1000, DIAGNOSTIC, \
1329 "Guarantee a safepoint (at least) every so many milliseconds " \
1330 "(0 means none)") \
1331 range(0, max_jint) \
1332 \
1333 product(intx, SafepointTimeoutDelay, 10000, \
1334 "Delay in milliseconds for option SafepointTimeout") \
1335 range(0, max_intx LP64_ONLY(/MICROUNITS)) \
1336 \
1337 product(intx, NmethodSweepActivity, 10, \
1338 "Removes cold nmethods from code cache if > 0. Higher values " \
1339 "result in more aggressive sweeping") \
1340 range(0, 2000) \
1341 \
1342 notproduct(bool, LogSweeper, false, \
1343 "Keep a ring buffer of sweeper activity") \
1344 \
1345 notproduct(intx, SweeperLogEntries, 1024, \
1346 "Number of records in the ring buffer of sweeper activity") \
1347 \
1348 develop(intx, MallocCatchPtr, -1, \
1349 "Hit breakpoint when mallocing/freeing this pointer") \
1350 \
1351 notproduct(ccstrlist, SuppressErrorAt, "", \
1352 "List of assertions (file:line) to muzzle") \
1353 \
1354 develop(intx, StackPrintLimit, 100, \
1355 "number of stack frames to print in VM-level stack dump") \
1356 \
1357 notproduct(intx, MaxElementPrintSize, 256, \
1358 "maximum number of elements to print") \
1359 \
1360 notproduct(intx, MaxSubklassPrintSize, 4, \
1361 "maximum number of subklasses to print when printing klass") \
1362 \
1363 develop(intx, MaxForceInlineLevel, 100, \
1364 "maximum number of nested calls that are forced for inlining " \
1365 "(using CompileCommand or marked w/ @ForceInline)") \
1366 range(0, max_jint) \
1367 \
1368 product(intx, MinInliningThreshold, 250, \
1369 "The minimum invocation count a method needs to have to be " \
1370 "inlined") \
1371 range(0, max_jint) \
1372 \
1373 develop(intx, MethodHistogramCutoff, 100, \
1374 "The cutoff value for method invocation histogram (+CountCalls)") \
1375 \
1376 develop(intx, DontYieldALotInterval, 10, \
1377 "Interval between which yields will be dropped (milliseconds)") \
1378 \
1379 notproduct(intx, DeoptimizeALotInterval, 5, \
1380 "Number of exits until DeoptimizeALot kicks in") \
1381 \
1382 notproduct(intx, ZombieALotInterval, 5, \
1383 "Number of exits until ZombieALot kicks in") \
1384 \
1385 product(uintx, MallocMaxTestWords, 0, DIAGNOSTIC, \
1386 "If non-zero, maximum number of words that malloc/realloc can " \
1387 "allocate (for testing only)") \
1388 range(0, max_uintx) \
1389 \
1390 product(intx, TypeProfileWidth, 2, \
1391 "Number of receiver types to record in call/cast profile") \
1392 range(0, 8) \
1393 \
1394 develop(intx, BciProfileWidth, 2, \
1395 "Number of return bci's to record in ret profile") \
1396 \
1397 product(intx, PerMethodRecompilationCutoff, 400, \
1398 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1399 range(-1, max_intx) \
1400 \
1401 product(intx, PerBytecodeRecompilationCutoff, 200, \
1402 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
1403 range(-1, max_intx) \
1404 \
1405 product(intx, PerMethodTrapLimit, 100, \
1406 "Limit on traps (of one kind) in a method (includes inlines)") \
1407 range(0, max_jint) \
1408 \
1409 product(intx, PerMethodSpecTrapLimit, 5000, EXPERIMENTAL, \
1410 "Limit on speculative traps (of one kind) in a method " \
1411 "(includes inlines)") \
1412 range(0, max_jint) \
1413 \
1414 product(intx, PerBytecodeTrapLimit, 4, \
1415 "Limit on traps (of one kind) at a particular BCI") \
1416 range(0, max_jint) \
1417 \
1418 product(intx, SpecTrapLimitExtraEntries, 3, EXPERIMENTAL, \
1419 "Extra method data trap entries for speculation") \
1420 \
1421 product(double, InlineFrequencyRatio, 0.25, DIAGNOSTIC, \
1422 "Ratio of call site execution to caller method invocation") \
1423 \
1424 develop(intx, InlineThrowCount, 50, \
1425 "Force inlining of interpreted methods that throw this often") \
1426 range(0, max_jint) \
1427 \
1428 develop(intx, InlineThrowMaxSize, 200, \
1429 "Force inlining of throwing methods smaller than this") \
1430 range(0, max_jint) \
1431 \
1432 product(size_t, MetaspaceSize, NOT_LP64(16 * M) LP64_ONLY(21 * M), \
1433 "Initial threshold (in bytes) at which a garbage collection " \
1434 "is done to reduce Metaspace usage") \
1435 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
1436 \
1437 product(size_t, MaxMetaspaceSize, max_uintx, \
1438 "Maximum size of Metaspaces (in bytes)") \
1439 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
1440 \
1441 product(size_t, CompressedClassSpaceSize, 1*G, \
1442 "Maximum size of class area in Metaspace when compressed " \
1443 "class pointers are used") \
1444 range(1*M, 3*G) \
1445 \
1446 develop(size_t, CompressedClassSpaceBaseAddress, 0, \
1447 "Force the class space to be allocated at this address or " \
1448 "fails VM initialization (requires -Xshare=off.") \
1449 \
1450 product(ccstr, MetaspaceReclaimPolicy, "balanced", \
1451 "options: balanced, aggressive, none") \
1452 \
1453 product(bool, PrintMetaspaceStatisticsAtExit, false, DIAGNOSTIC, \
1454 "Print metaspace statistics upon VM exit.") \
1455 \
1456 develop(bool, MetaspaceGuardAllocations, false, \
1457 "Metapace allocations are guarded.") \
1458 \
1459 develop(bool, MetaspaceHandleDeallocations, true, \
1460 "Switch off Metapace deallocation handling.") \
1461 \
1462 product(uintx, MinHeapFreeRatio, 40, MANAGEABLE, \
1463 "The minimum percentage of heap free after GC to avoid expansion."\
1464 " For most GCs this applies to the old generation. In G1 and" \
1465 " ParallelGC it applies to the whole heap.") \
1466 range(0, 100) \
1467 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
1468 \
1469 product(uintx, MaxHeapFreeRatio, 70, MANAGEABLE, \
1470 "The maximum percentage of heap free after GC to avoid shrinking."\
1471 " For most GCs this applies to the old generation. In G1 and" \
1472 " ParallelGC it applies to the whole heap.") \
1473 range(0, 100) \
1474 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
1475 \
1476 product(bool, ShrinkHeapInSteps, true, \
1477 "When disabled, informs the GC to shrink the java heap directly" \
1478 " to the target size at the next full GC rather than requiring" \
1479 " smaller steps during multiple full GCs.") \
1480 \
1481 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
1482 "Number of milliseconds per MB of free space in the heap") \
1483 range(0, max_intx) \
1484 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1485 \
1486 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
1487 "The minimum change in heap space due to GC (in bytes)") \
1488 range(0, max_uintx) \
1489 \
1490 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
1491 "The minimum expansion of Metaspace (in bytes)") \
1492 range(0, max_uintx) \
1493 \
1494 product(uintx, MaxMetaspaceFreeRatio, 70, \
1495 "The maximum percentage of Metaspace free after GC to avoid " \
1496 "shrinking") \
1497 range(0, 100) \
1498 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
1499 \
1500 product(uintx, MinMetaspaceFreeRatio, 40, \
1501 "The minimum percentage of Metaspace free after GC to avoid " \
1502 "expansion") \
1503 range(0, 99) \
1504 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
1505 \
1506 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
1507 "The maximum expansion of Metaspace without full GC (in bytes)") \
1508 range(0, max_uintx) \
1509 \
1510 /* stack parameters */ \
1511 product_pd(intx, StackYellowPages, \
1512 "Number of yellow zone (recoverable overflows) pages of size " \
1513 "4KB. If pages are bigger yellow zone is aligned up.") \
1514 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
1515 \
1516 product_pd(intx, StackRedPages, \
1517 "Number of red zone (unrecoverable overflows) pages of size " \
1518 "4KB. If pages are bigger red zone is aligned up.") \
1519 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
1520 \
1521 product_pd(intx, StackReservedPages, \
1522 "Number of reserved zone (reserved to annotated methods) pages" \
1523 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1524 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1525 \
1526 product(bool, RestrictReservedStack, true, \
1527 "Restrict @ReservedStackAccess to trusted classes") \
1528 \
1529 /* greater stack shadow pages can't generate instruction to bang stack */ \
1530 product_pd(intx, StackShadowPages, \
1531 "Number of shadow zone (for overflow checking) pages of size " \
1532 "4KB. If pages are bigger shadow zone is aligned up. " \
1533 "This should exceed the depth of the VM and native call stack.") \
1534 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
1535 \
1536 product_pd(intx, ThreadStackSize, \
1537 "Thread Stack Size (in Kbytes)") \
1538 range(0, 1 * M) \
1539 \
1540 product_pd(intx, VMThreadStackSize, \
1541 "Non-Java Thread Stack Size (in Kbytes)") \
1542 range(0, max_intx/(1 * K)) \
1543 \
1544 product_pd(intx, CompilerThreadStackSize, \
1545 "Compiler Thread Stack Size (in Kbytes)") \
1546 range(0, max_intx/(1 * K)) \
1547 \
1548 develop_pd(size_t, JVMInvokeMethodSlack, \
1549 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
1550 \
1551 /* code cache parameters */ \
1552 develop_pd(uintx, CodeCacheSegmentSize, \
1553 "Code cache segment size (in bytes) - smallest unit of " \
1554 "allocation") \
1555 range(1, 1024) \
1556 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
1557 \
1558 develop_pd(intx, CodeEntryAlignment, \
1559 "Code entry alignment for generated code (in bytes)") \
1560 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
1561 \
1562 product_pd(intx, OptoLoopAlignment, \
1563 "Align inner loops to zero relative to this modulus") \
1564 range(1, 16) \
1565 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
1566 \
1567 product_pd(uintx, InitialCodeCacheSize, \
1568 "Initial code cache size (in bytes)") \
1569 constraint(VMPageSizeConstraintFunc, AtParse) \
1570 \
1571 develop_pd(uintx, CodeCacheMinimumUseSpace, \
1572 "Minimum code cache size (in bytes) required to start VM.") \
1573 range(0, max_uintx) \
1574 \
1575 product(bool, SegmentedCodeCache, false, \
1576 "Use a segmented code cache") \
1577 \
1578 product_pd(uintx, ReservedCodeCacheSize, \
1579 "Reserved code cache size (in bytes) - maximum code cache size") \
1580 constraint(VMPageSizeConstraintFunc, AtParse) \
1581 \
1582 product_pd(uintx, NonProfiledCodeHeapSize, \
1583 "Size of code heap with non-profiled methods (in bytes)") \
1584 range(0, max_uintx) \
1585 \
1586 product_pd(uintx, ProfiledCodeHeapSize, \
1587 "Size of code heap with profiled methods (in bytes)") \
1588 range(0, max_uintx) \
1589 \
1590 product_pd(uintx, NonNMethodCodeHeapSize, \
1591 "Size of code heap with non-nmethods (in bytes)") \
1592 constraint(VMPageSizeConstraintFunc, AtParse) \
1593 \
1594 product_pd(uintx, CodeCacheExpansionSize, \
1595 "Code cache expansion size (in bytes)") \
1596 range(32*K, max_uintx) \
1597 \
1598 product_pd(uintx, CodeCacheMinBlockLength, DIAGNOSTIC, \
1599 "Minimum number of segments in a code cache block") \
1600 range(1, 100) \
1601 \
1602 notproduct(bool, ExitOnFullCodeCache, false, \
1603 "Exit the VM if we fill the code cache") \
1604 \
1605 product(bool, UseCodeCacheFlushing, true, \
1606 "Remove cold/old nmethods from the code cache") \
1607 \
1608 product(double, SweeperThreshold, 0.5, \
1609 "Threshold controlling when code cache sweeper is invoked." \
1610 "Value is percentage of ReservedCodeCacheSize.") \
1611 range(0.0, 100.0) \
1612 \
1613 product(uintx, StartAggressiveSweepingAt, 10, \
1614 "Start aggressive sweeping if X[%] of the code cache is free." \
1615 "Segmented code cache: X[%] of the non-profiled heap." \
1616 "Non-segmented code cache: X[%] of the total code cache") \
1617 range(0, 100) \
1618 \
1619 /* interpreter debugging */ \
1620 develop(intx, BinarySwitchThreshold, 5, \
1621 "Minimal number of lookupswitch entries for rewriting to binary " \
1622 "switch") \
1623 \
1624 develop(intx, StopInterpreterAt, 0, \
1625 "Stop interpreter execution at specified bytecode number") \
1626 \
1627 develop(intx, TraceBytecodesAt, 0, \
1628 "Trace bytecodes starting with specified bytecode number") \
1629 \
1630 /* Priorities */ \
1631 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
1632 \
1633 product(intx, ThreadPriorityPolicy, 0, \
1634 "0 : Normal. "\
1635 " VM chooses priorities that are appropriate for normal "\
1636 " applications. "\
1637 " On Windows applications are allowed to use higher native "\
1638 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
1639 " not use the highest possible native priority, "\
1640 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
1641 " system threads. On Linux thread priorities are ignored "\
1642 " because the OS does not support static priority in "\
1643 " SCHED_OTHER scheduling class which is the only choice for "\
1644 " non-root, non-realtime applications. "\
1645 "1 : Aggressive. "\
1646 " Java thread priorities map over to the entire range of "\
1647 " native thread priorities. Higher Java thread priorities map "\
1648 " to higher native thread priorities. This policy should be "\
1649 " used with care, as sometimes it can cause performance "\
1650 " degradation in the application and/or the entire system. On "\
1651 " Linux/BSD/macOS this policy requires root privilege or an "\
1652 " extended capability.") \
1653 range(0, 1) \
1654 \
1655 product(bool, ThreadPriorityVerbose, false, \
1656 "Print priority changes") \
1657 \
1658 product(intx, CompilerThreadPriority, -1, \
1659 "The native priority at which compiler threads should run " \
1660 "(-1 means no change)") \
1661 range(min_jint, max_jint) \
1662 \
1663 product(intx, VMThreadPriority, -1, \
1664 "The native priority at which the VM thread should run " \
1665 "(-1 means no change)") \
1666 range(-1, 127) \
1667 \
1668 product(intx, JavaPriority1_To_OSPriority, -1, \
1669 "Map Java priorities to OS priorities") \
1670 range(-1, 127) \
1671 \
1672 product(intx, JavaPriority2_To_OSPriority, -1, \
1673 "Map Java priorities to OS priorities") \
1674 range(-1, 127) \
1675 \
1676 product(intx, JavaPriority3_To_OSPriority, -1, \
1677 "Map Java priorities to OS priorities") \
1678 range(-1, 127) \
1679 \
1680 product(intx, JavaPriority4_To_OSPriority, -1, \
1681 "Map Java priorities to OS priorities") \
1682 range(-1, 127) \
1683 \
1684 product(intx, JavaPriority5_To_OSPriority, -1, \
1685 "Map Java priorities to OS priorities") \
1686 range(-1, 127) \
1687 \
1688 product(intx, JavaPriority6_To_OSPriority, -1, \
1689 "Map Java priorities to OS priorities") \
1690 range(-1, 127) \
1691 \
1692 product(intx, JavaPriority7_To_OSPriority, -1, \
1693 "Map Java priorities to OS priorities") \
1694 range(-1, 127) \
1695 \
1696 product(intx, JavaPriority8_To_OSPriority, -1, \
1697 "Map Java priorities to OS priorities") \
1698 range(-1, 127) \
1699 \
1700 product(intx, JavaPriority9_To_OSPriority, -1, \
1701 "Map Java priorities to OS priorities") \
1702 range(-1, 127) \
1703 \
1704 product(intx, JavaPriority10_To_OSPriority,-1, \
1705 "Map Java priorities to OS priorities") \
1706 range(-1, 127) \
1707 \
1708 product(bool, UseCriticalJavaThreadPriority, false, EXPERIMENTAL, \
1709 "Java thread priority 10 maps to critical scheduling priority") \
1710 \
1711 product(bool, UseCriticalCompilerThreadPriority, false, EXPERIMENTAL, \
1712 "Compiler thread(s) run at critical scheduling priority") \
1713 \
1714 develop(intx, NewCodeParameter, 0, \
1715 "Testing Only: Create a dedicated integer parameter before " \
1716 "putback") \
1717 \
1718 /* new oopmap storage allocation */ \
1719 develop(intx, MinOopMapAllocation, 8, \
1720 "Minimum number of OopMap entries in an OopMapSet") \
1721 \
1722 /* recompilation */ \
1723 product_pd(intx, CompileThreshold, \
1724 "number of interpreted method invocations before (re-)compiling") \
1725 constraint(CompileThresholdConstraintFunc, AfterErgo) \
1726 \
1727 product_pd(bool, TieredCompilation, \
1728 "Enable tiered compilation") \
1729 \
1730 /* Properties for Java libraries */ \
1731 \
1732 product(uint64_t, MaxDirectMemorySize, 0, \
1733 "Maximum total size of NIO direct-buffer allocations") \
1734 range(0, max_jlong) \
1735 \
1736 /* Flags used for temporary code during development */ \
1737 \
1738 product(bool, UseNewCode, false, DIAGNOSTIC, \
1739 "Testing Only: Use the new version while testing") \
1740 \
1741 product(bool, UseNewCode2, false, DIAGNOSTIC, \
1742 "Testing Only: Use the new version while testing") \
1743 \
1744 product(bool, UseNewCode3, false, DIAGNOSTIC, \
1745 "Testing Only: Use the new version while testing") \
1746 \
1747 notproduct(bool, UseDebuggerErgo, false, \
1748 "Debugging Only: Adjust the VM to be more debugger-friendly. " \
1749 "Turns on the other UseDebuggerErgo* flags") \
1750 \
1751 notproduct(bool, UseDebuggerErgo1, false, \
1752 "Debugging Only: Enable workarounds for debugger induced " \
1753 "os::processor_id() >= os::processor_count() problems") \
1754 \
1755 notproduct(bool, UseDebuggerErgo2, false, \
1756 "Debugging Only: Limit the number of spawned JVM threads") \
1757 \
1758 notproduct(bool, EnableJVMTIStackDepthAsserts, true, \
1759 "Enable JVMTI asserts related to stack depth checks") \
1760 \
1761 /* flags for performance data collection */ \
1762 \
1763 product(bool, UsePerfData, true, \
1764 "Flag to disable jvmstat instrumentation for performance testing "\
1765 "and problem isolation purposes") \
1766 \
1767 product(bool, PerfDataSaveToFile, false, \
1768 "Save PerfData memory to hsperfdata_<pid> file on exit") \
1769 \
1770 product(ccstr, PerfDataSaveFile, NULL, \
1771 "Save PerfData memory to the specified absolute pathname. " \
1772 "The string %p in the file name (if present) " \
1773 "will be replaced by pid") \
1774 \
1775 product(intx, PerfDataSamplingInterval, 50, \
1776 "Data sampling interval (in milliseconds)") \
1777 range(PeriodicTask::min_interval, max_jint) \
1778 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
1779 \
1780 product(bool, PerfDisableSharedMem, false, \
1781 "Store performance data in standard memory") \
1782 \
1783 product(intx, PerfDataMemorySize, 32*K, \
1784 "Size of performance data memory region. Will be rounded " \
1785 "up to a multiple of the native os page size.") \
1786 range(128, 32*64*K) \
1787 \
1788 product(intx, PerfMaxStringConstLength, 1024, \
1789 "Maximum PerfStringConstant string length before truncation") \
1790 range(32, 32*K) \
1791 \
1792 product(bool, PerfAllowAtExitRegistration, false, \
1793 "Allow registration of atexit() methods") \
1794 \
1795 product(bool, PerfBypassFileSystemCheck, false, \
1796 "Bypass Win32 file system criteria checks (Windows Only)") \
1797 \
1798 product(intx, UnguardOnExecutionViolation, 0, \
1799 "Unguard page and retry on no-execute fault (Win32 only) " \
1800 "0=off, 1=conservative, 2=aggressive") \
1801 range(0, 2) \
1802 \
1803 /* Serviceability Support */ \
1804 \
1805 product(bool, ManagementServer, false, \
1806 "Create JMX Management Server") \
1807 \
1808 product(bool, DisableAttachMechanism, false, \
1809 "Disable mechanism that allows tools to attach to this VM") \
1810 \
1811 product(bool, StartAttachListener, false, \
1812 "Always start Attach Listener at VM startup") \
1813 \
1814 product(bool, EnableDynamicAgentLoading, true, \
1815 "Allow tools to load agents with the attach mechanism") \
1816 \
1817 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \
1818 "Print java.util.concurrent locks in thread dump") \
1819 \
1820 /* Shared spaces */ \
1821 \
1822 product(bool, UseSharedSpaces, true, \
1823 "Use shared spaces for metadata") \
1824 \
1825 product(bool, VerifySharedSpaces, false, \
1826 "Verify integrity of shared spaces") \
1827 \
1828 product(bool, RequireSharedSpaces, false, \
1829 "Require shared spaces for metadata") \
1830 \
1831 product(bool, DumpSharedSpaces, false, \
1832 "Special mode: JVM reads a class list, loads classes, builds " \
1833 "shared spaces, and dumps the shared spaces to a file to be " \
1834 "used in future JVM runs") \
1835 \
1836 product(bool, DynamicDumpSharedSpaces, false, \
1837 "Dynamic archive") \
1838 \
1839 product(bool, RecordDynamicDumpInfo, false, \
1840 "Record class info for jcmd VM.cds dynamic_dump") \
1841 \
1842 product(bool, PrintSharedArchiveAndExit, false, \
1843 "Print shared archive file contents") \
1844 \
1845 product(bool, PrintSharedDictionary, false, \
1846 "If PrintSharedArchiveAndExit is true, also print the shared " \
1847 "dictionary") \
1848 \
1849 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
1850 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
1851 "Address to allocate shared memory region for class data") \
1852 range(0, SIZE_MAX) \
1853 \
1854 product(ccstr, SharedArchiveConfigFile, NULL, \
1855 "Data to add to the CDS archive file") \
1856 \
1857 product(uintx, SharedSymbolTableBucketSize, 4, \
1858 "Average number of symbols per bucket in shared table") \
1859 range(2, 246) \
1860 \
1861 product(bool, AllowArchivingWithJavaAgent, false, DIAGNOSTIC, \
1862 "Allow Java agent to be run with CDS dumping") \
1863 \
1864 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \
1865 "Print generated stub code for method handles") \
1866 \
1867 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \
1868 "perform extra checks when constructing method handles") \
1869 \
1870 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \
1871 "show method handle implementation frames (usually hidden)") \
1872 \
1873 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \
1874 "trust final non-static declarations for constant folding") \
1875 \
1876 product(bool, FoldStableValues, true, DIAGNOSTIC, \
1877 "Optimize loads from stable fields (marked w/ @Stable)") \
1878 \
1879 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \
1880 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
1881 "resolved before the bootstrap method is called; 1: when a BSM " \
1882 "that may accept a BootstrapCallInfo is detected, use that API " \
1883 "to pass BSM arguments, which allows the BSM to delay their " \
1884 "resolution; 2+: stress test the BCI API by calling more BSMs " \
1885 "via that API, instead of with the eagerly-resolved array.") \
1886 \
1887 product(bool, PauseAtStartup, false, DIAGNOSTIC, \
1888 "Causes the VM to pause at startup time and wait for the pause " \
1889 "file to be removed (default: ./vm.paused.<pid>)") \
1890 \
1891 product(ccstr, PauseAtStartupFile, NULL, DIAGNOSTIC, \
1892 "The file to create and for whose removal to await when pausing " \
1893 "at startup. (default: ./vm.paused.<pid>)") \
1894 \
1895 product(bool, PauseAtExit, false, DIAGNOSTIC, \
1896 "Pause and wait for keypress on exit if a debugger is attached") \
1897 \
1898 product(bool, ExtendedDTraceProbes, false, \
1899 "Enable performance-impacting dtrace probes") \
1900 \
1901 product(bool, DTraceMethodProbes, false, \
1902 "Enable dtrace probes for method-entry and method-exit") \
1903 \
1904 product(bool, DTraceAllocProbes, false, \
1905 "Enable dtrace probes for object allocation") \
1906 \
1907 product(bool, DTraceMonitorProbes, false, \
1908 "Enable dtrace probes for monitor events") \
1909 \
1910 product(bool, RelaxAccessControlCheck, false, \
1911 "Relax the access control checks in the verifier") \
1912 \
1913 product(uintx, StringTableSize, defaultStringTableSize, \
1914 "Number of buckets in the interned String table " \
1915 "(will be rounded to nearest higher power of 2)") \
1916 range(minimumStringTableSize, 16777216ul /* 2^24 */) \
1917 \
1918 product(uintx, SymbolTableSize, defaultSymbolTableSize, EXPERIMENTAL, \
1919 "Number of buckets in the JVM internal Symbol table") \
1920 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \
1921 \
1922 product(bool, UseStringDeduplication, false, \
1923 "Use string deduplication") \
1924 \
1925 product(uint, StringDeduplicationAgeThreshold, 3, \
1926 "A string must reach this age (or be promoted to an old region) " \
1927 "to be considered for deduplication") \
1928 range(1, markWord::max_age) \
1929 \
1930 product(size_t, StringDeduplicationInitialTableSize, 500, EXPERIMENTAL, \
1931 "Approximate initial number of buckets in the table") \
1932 range(1, 1 * G) \
1933 \
1934 product(double, StringDeduplicationGrowTableLoad, 14.0, EXPERIMENTAL, \
1935 "Entries per bucket above which the table should be expanded") \
1936 range(0.1, 1000.0) \
1937 \
1938 product(double, StringDeduplicationShrinkTableLoad, 1.0, EXPERIMENTAL, \
1939 "Entries per bucket below which the table should be shrunk") \
1940 range(0.01, 100.0) \
1941 \
1942 product(double, StringDeduplicationTargetTableLoad, 7.0, EXPERIMENTAL, \
1943 "Desired entries per bucket when resizing the table") \
1944 range(0.01, 1000.0) \
1945 \
1946 product(size_t, StringDeduplicationCleanupDeadMinimum, 100, EXPERIMENTAL, \
1947 "Minimum number of dead table entries for cleaning the table") \
1948 \
1949 product(int, StringDeduplicationCleanupDeadPercent, 5, EXPERIMENTAL, \
1950 "Minimum percentage of dead table entries for cleaning the table") \
1951 range(1, 100) \
1952 \
1953 product(bool, StringDeduplicationResizeALot, false, DIAGNOSTIC, \
1954 "Force more frequent table resizing") \
1955 \
1956 product(uint64_t, StringDeduplicationHashSeed, 0, DIAGNOSTIC, \
1957 "Seed for the table hashing function; 0 requests computed seed") \
1958 \
1959 product(bool, WhiteBoxAPI, false, DIAGNOSTIC, \
1960 "Enable internal testing APIs") \
1961 \
1962 product(ccstr, DumpLoadedClassList, NULL, \
1963 "Dump the names all loaded classes, that could be stored into " \
1964 "the CDS archive, in the specified file") \
1965 \
1966 product(ccstr, SharedClassListFile, NULL, \
1967 "Override the default CDS class list") \
1968 \
1969 product(ccstr, SharedArchiveFile, NULL, \
1970 "Override the default location of the CDS archive file") \
1971 \
1972 product(ccstr, ArchiveClassesAtExit, NULL, \
1973 "The path and name of the dynamic archive file") \
1974 \
1975 product(ccstr, ExtraSharedClassListFile, NULL, \
1976 "Extra classlist for building the CDS archive file") \
1977 \
1978 product(intx, ArchiveRelocationMode, 0, DIAGNOSTIC, \
1979 "(0) first map at preferred address, and if " \
1980 "unsuccessful, map at alternative address (default); " \
1981 "(1) always map at alternative address; " \
1982 "(2) always map at preferred address, and if unsuccessful, " \
1983 "do not map the archive") \
1984 range(0, 2) \
1985 \
1986 product(size_t, ArrayAllocatorMallocLimit, (size_t)-1, EXPERIMENTAL, \
1987 "Allocation less than this value will be allocated " \
1988 "using malloc. Larger allocations will use mmap.") \
1989 \
1990 product(bool, AlwaysAtomicAccesses, false, EXPERIMENTAL, \
1991 "Accesses to all variables should always be atomic") \
1992 \
1993 product(bool, UseUnalignedAccesses, false, DIAGNOSTIC, \
1994 "Use unaligned memory accesses in Unsafe") \
1995 \
1996 product_pd(bool, PreserveFramePointer, \
1997 "Use the FP register for holding the frame pointer " \
1998 "and not as a general purpose register.") \
1999 \
2000 product(size_t, AsyncLogBufferSize, 2*M, \
2001 "Memory budget (in bytes) for the buffer of Asynchronous " \
2002 "Logging (-Xlog:async).") \
2003 range(100*K, 50*M) \
2004 \
2005 product(bool, CheckIntrinsics, true, DIAGNOSTIC, \
2006 "When a class C is loaded, check that " \
2007 "(1) all intrinsics defined by the VM for class C are present "\
2008 "in the loaded class file and are marked with the " \
2009 "@IntrinsicCandidate annotation, that " \
2010 "(2) there is an intrinsic registered for all loaded methods " \
2011 "that are annotated with the @IntrinsicCandidate annotation, " \
2012 "and that " \
2013 "(3) no orphan methods exist for class C (i.e., methods for " \
2014 "which the VM declares an intrinsic but that are not declared "\
2015 "in the loaded class C. " \
2016 "Check (3) is available only in debug builds.") \
2017 \
2018 product_pd(intx, InitArrayShortSize, DIAGNOSTIC, \
2019 "Threshold small size (in bytes) for clearing arrays. " \
2020 "Anything this size or smaller may get converted to discrete " \
2021 "scalar stores.") \
2022 range(0, max_intx) \
2023 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
2024 \
2025 product(ccstr, AllocateHeapAt, NULL, \
2026 "Path to the directory where a temporary file will be created " \
2027 "to use as the backing store for Java Heap.") \
2028 \
2029 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \
2030 "Run periodic metaspace verifications (0 - none, " \
2031 "1 - always, >1 every nth interval)") \
2032 \
2033 product(bool, ShowRegistersOnAssert, true, DIAGNOSTIC, \
2034 "On internal errors, include registers in error report.") \
2035 \
2036 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \
2037 "leverage profiling for table/lookup switch") \
2038 \
2039 develop(bool, TraceMemoryWriteback, false, \
2040 "Trace memory writeback operations") \
2041 \
2042 JFR_ONLY(product(bool, FlightRecorder, false, \
2043 "(Deprecated) Enable Flight Recorder")) \
2044 \
2045 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \
2046 "Flight Recorder options")) \
2047 \
2048 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \
2049 "Start flight recording with options")) \
2050 \
2051 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \
2052 "Use platform unstable time where supported for timestamps only") \
2053 \
2054 product(bool, EnableValhalla, true, \
2055 "Enable experimental Valhalla features") \
2056 \
2057 product_pd(bool, InlineTypePassFieldsAsArgs, \
2058 "Pass each inline type field as an argument at calls") \
2059 \
2060 product_pd(bool, InlineTypeReturnedAsFields, \
2061 "Return fields instead of an inline type reference") \
2062 \
2063 develop(bool, StressInlineTypeReturnedAsFields, false, \
2064 "Stress return of fields instead of an inline type reference") \
2065 \
2066 product(bool, UseArrayMarkWordCheck, NOT_LP64(false) LP64_ONLY(true), \
2067 "Use bits in the mark word to check for flat/null-free arrays") \
2068 \
2069 product(ccstrlist, ForceNonTearable, "", DIAGNOSTIC, \
2070 "List of inline classes which are forced to be atomic " \
2071 "(whitespace and commas separate names, " \
2072 "and leading and trailing stars '*' are wildcards)") \
2073 \
2074 product(bool, UseEmptySlotsInSupers, true, \
2075 "Allow allocating fields in empty slots of super-classes") \
2076 \
2077 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \
2078 "Make nmethod barriers deoptimise a lot.") \
2079 \
2080 develop(bool, VerifyCrossModifyFence, \
2081 false AARCH64_ONLY(DEBUG_ONLY(||true)), \
2082 "Mark all threads after a safepoint, and clear on a modify " \
2083 "fence. Add cleanliness checks.") \
2084 \
2085 develop(bool, TraceOptimizedUpcallStubs, false, \
2086 "Trace optimized upcall stub generation") \
2087
2088 // end of RUNTIME_FLAGS
2089
2090 DECLARE_FLAGS(LP64_RUNTIME_FLAGS)
2091 DECLARE_ARCH_FLAGS(ARCH_FLAGS)
2092 DECLARE_FLAGS(RUNTIME_FLAGS)
2093 DECLARE_FLAGS(RUNTIME_OS_FLAGS)
2094
2095 #endif // SHARE_RUNTIME_GLOBALS_HPP