1 /*
2 * Copyright (c) 1997, 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
25 #ifndef SHARE_RUNTIME_GLOBALS_HPP
26 #define SHARE_RUNTIME_GLOBALS_HPP
27
28 #include "compiler/compiler_globals.hpp"
29 #include "gc/shared/gc_globals.hpp"
30 #include "runtime/globals_shared.hpp"
31 #include "utilities/align.hpp"
32 #include "utilities/globalDefinitions.hpp"
33 #include "utilities/macros.hpp"
34 #include CPU_HEADER(globals)
35 #include OS_HEADER(globals)
36 #include OS_CPU_HEADER(globals)
37
38 // develop flags are settable / visible only during development and are constant in the PRODUCT version
39 // product flags are always settable / visible
40 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
41
42 // A flag must be declared with one of the following types:
43 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t.
44 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used
45 // only in this file, because the macrology requires single-token type names.
46
47 // Note: Diagnostic options not meant for VM tuning or for product modes.
48 // They are to be used for VM quality assurance or field diagnosis
49 // of VM bugs. They are hidden so that users will not be encouraged to
50 // try them as if they were VM ordinary execution options. However, they
51 // are available in the product version of the VM. Under instruction
52 // from support engineers, VM customers can turn them on to collect
53 // diagnostic information about VM problems. To use a VM diagnostic
54 // option, you must first specify +UnlockDiagnosticVMOptions.
55 // (This master switch also affects the behavior of -Xprintflags.)
56 //
57 // experimental flags are in support of features that are not
58 // part of the officially supported product, but are available
59 // for experimenting with. They could, for example, be performance
60 // features that may not have undergone full or rigorous QA, but which may
61 // help performance in some cases and released for experimentation
62 // by the community of users and developers. This flag also allows one to
63 // be able to build a fully supported product that nonetheless also
64 // ships with some unsupported, lightly tested, experimental features.
65 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
66 // UnlockExperimentalVMOptions flag, which allows the control and
67 // modification of the experimental flags.
68 //
69 // Nota bene: neither diagnostic nor experimental options should be used casually,
70 // and they are not supported on production loads, except under explicit
71 // direction from support engineers.
72 //
73 // manageable flags are writeable external product flags.
74 // They are dynamically writeable through the JDK management interface
75 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
76 // These flags are external exported interface (see CCC). The list of
77 // manageable flags can be queried programmatically through the management
78 // interface.
79 //
80 // A flag can be made as "manageable" only if
81 // - the flag is defined in a CCC as an external exported interface.
82 // - the VM implementation supports dynamic setting of the flag.
83 // This implies that the VM must *always* query the flag variable
84 // and not reuse state related to the flag state at any given time.
85 // - you want the flag to be queried programmatically by the customers.
86 //
87 // product_rw flags are writeable internal product flags.
88 // They are like "manageable" flags but for internal/private use.
89 // The list of product_rw flags are internal/private flags which
90 // may be changed/removed in a future release. It can be set
91 // through the management interface to get/set value
92 // when the name of flag is supplied.
93 //
94 // A flag can be made as "product_rw" only if
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 //
99 // Note that when there is a need to support develop flags to be writeable,
100 // it can be done in the same way as product_rw.
101 //
102 // range is a macro that will expand to min and max arguments for range
103 // checking code if provided - see jvmFlagRangeList.hpp
104 //
105 // constraint is a macro that will expand to custom function call
106 // for constraint checking if provided - see jvmFlagConstraintList.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 #define RUNTIME_FLAGS(develop, \
116 develop_pd, \
117 product, \
118 product_pd, \
119 diagnostic, \
120 diagnostic_pd, \
121 experimental, \
122 notproduct, \
123 manageable, \
124 product_rw, \
125 lp64_product, \
126 range, \
127 constraint) \
128 \
129 lp64_product(bool, UseCompressedOops, false, \
130 "Use 32-bit object references in 64-bit VM. " \
131 "lp64_product means flag is always constant in 32 bit VM") \
132 \
133 lp64_product(bool, UseCompressedClassPointers, false, \
134 "Use 32-bit class pointers in 64-bit VM. " \
135 "lp64_product means flag is always constant in 32 bit VM") \
136 \
137 notproduct(bool, CheckCompressedOops, true, \
138 "Generate checks in encoding/decoding code in debug VM") \
139 \
140 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \
141 "Heap allocation steps through preferred address regions to find" \
142 " where it can allocate the heap. Number of steps to take per " \
143 "region.") \
144 range(1, max_uintx) \
145 \
146 lp64_product(intx, ObjectAlignmentInBytes, 8, \
147 "Default object alignment in bytes, 8 is minimum") \
148 range(8, 256) \
149 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \
150 \
151 develop(bool, CleanChunkPoolAsync, true, \
152 "Clean the chunk pool asynchronously") \
153 \
154 diagnostic(uint, HandshakeTimeout, 0, \
155 "If nonzero set a timeout in milliseconds for handshakes") \
156 \
157 experimental(bool, AlwaysSafeConstructors, false, \
158 "Force safe construction, as if all fields are final.") \
159 \
160 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \
161 "Enable normal processing of flags relating to field diagnostics")\
162 \
163 experimental(bool, UnlockExperimentalVMOptions, false, \
164 "Enable normal processing of flags relating to experimental " \
165 "features") \
166 \
167 product(bool, JavaMonitorsInStackTrace, true, \
168 "Print information about Java monitor locks when the stacks are" \
169 "dumped") \
170 \
171 product_pd(bool, UseLargePages, \
172 "Use large page memory") \
173 \
174 product_pd(bool, UseLargePagesIndividualAllocation, \
175 "Allocate large pages individually for better affinity") \
176 \
177 develop(bool, LargePagesIndividualAllocationInjectError, false, \
178 "Fail large pages individual allocation") \
179 \
180 product(bool, UseLargePagesInMetaspace, false, \
181 "Use large page memory in metaspace. " \
182 "Only used if UseLargePages is enabled.") \
183 \
184 product(bool, UseNUMA, false, \
185 "Use NUMA if available") \
186 \
187 product(bool, UseNUMAInterleaving, false, \
188 "Interleave memory across NUMA nodes if available") \
189 \
190 product(size_t, NUMAInterleaveGranularity, 2*M, \
191 "Granularity to use for NUMA interleaving on Windows OS") \
192 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
193 \
194 product(bool, ForceNUMA, false, \
195 "Force NUMA optimizations on single-node/UMA systems") \
196 \
197 product(uintx, NUMAChunkResizeWeight, 20, \
198 "Percentage (0-100) used to weight the current sample when " \
199 "computing exponentially decaying average for " \
200 "AdaptiveNUMAChunkSizing") \
201 range(0, 100) \
202 \
203 product(size_t, NUMASpaceResizeRate, 1*G, \
204 "Do not reallocate more than this amount per collection") \
205 range(0, max_uintx) \
206 \
207 product(bool, UseAdaptiveNUMAChunkSizing, true, \
208 "Enable adaptive chunk sizing for NUMA") \
209 \
210 product(bool, NUMAStats, false, \
211 "Print NUMA stats in detailed heap information") \
212 \
213 product(uintx, NUMAPageScanRate, 256, \
214 "Maximum number of pages to include in the page scan procedure") \
215 range(0, max_uintx) \
216 \
217 product(intx, UseSSE, 99, \
218 "Highest supported SSE instructions set on x86/x64") \
219 range(0, 99) \
220 \
221 product(bool, UseAES, false, \
222 "Control whether AES instructions are used when available") \
223 \
224 product(bool, UseFMA, false, \
225 "Control whether FMA instructions are used when available") \
226 \
227 product(bool, UseSHA, false, \
228 "Control whether SHA instructions are used when available") \
229 \
230 diagnostic(bool, UseGHASHIntrinsics, false, \
231 "Use intrinsics for GHASH versions of crypto") \
232 \
233 product(bool, UseBASE64Intrinsics, false, \
234 "Use intrinsics for java.util.Base64") \
235 \
236 product(size_t, LargePageSizeInBytes, 0, \
237 "Large page size (0 to let VM choose the page size)") \
238 range(0, max_uintx) \
239 \
240 product(size_t, LargePageHeapSizeThreshold, 128*M, \
241 "Use large pages if maximum heap is at least this big") \
242 range(0, max_uintx) \
243 \
244 product(bool, ForceTimeHighResolution, false, \
245 "Using high time resolution (for Win32 only)") \
246 \
247 develop(bool, TracePcPatching, false, \
248 "Trace usage of frame::patch_pc") \
249 \
250 develop(bool, TraceRelocator, false, \
251 "Trace the bytecode relocator") \
252 \
253 develop(bool, TraceLongCompiles, false, \
254 "Print out every time compilation is longer than " \
255 "a given threshold") \
256 \
257 diagnostic(bool, SafepointALot, false, \
258 "Generate a lot of safepoints. This works with " \
259 "GuaranteedSafepointInterval") \
260 \
261 diagnostic(bool, HandshakeALot, false, \
262 "Generate a lot of handshakes. This works with " \
263 "GuaranteedSafepointInterval") \
264 \
265 product_pd(bool, BackgroundCompilation, \
266 "A thread requesting compilation is not blocked during " \
267 "compilation") \
268 \
269 product(bool, PrintVMQWaitTime, false, \
270 "(Deprecated) Print out the waiting time in VM operation queue") \
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 diagnostic(bool, ForceUnreachable, false, \
279 "Make all non code cache addresses to be unreachable by " \
280 "forcing use of 64bit literal fixups") \
281 \
282 notproduct(bool, StressDerivedPointers, false, \
283 "Force scavenge when a derived pointer is detected on stack " \
284 "after rtm call") \
285 \
286 develop(bool, TraceDerivedPointers, false, \
287 "Trace traversal of derived pointers on stack") \
288 \
289 notproduct(bool, TraceCodeBlobStacks, false, \
290 "Trace stack-walk of codeblobs") \
291 \
292 notproduct(bool, PrintRewrites, false, \
293 "Print methods that are being rewritten") \
294 \
295 product(bool, UseInlineCaches, true, \
296 "Use Inline Caches for virtual calls ") \
297 \
298 diagnostic(bool, InlineArrayCopy, true, \
299 "Inline arraycopy native that is known to be part of " \
300 "base library DLL") \
301 \
302 diagnostic(bool, InlineObjectHash, true, \
303 "Inline Object::hashCode() native that is known to be part " \
304 "of base library DLL") \
305 \
306 diagnostic(bool, InlineNatives, true, \
307 "Inline natives that are known to be part of base library DLL") \
308 \
309 diagnostic(bool, InlineMathNatives, true, \
310 "Inline SinD, CosD, etc.") \
311 \
312 diagnostic(bool, InlineClassNatives, true, \
313 "Inline Class.isInstance, etc") \
314 \
315 diagnostic(bool, InlineThreadNatives, true, \
316 "Inline Thread.currentThread, etc") \
317 \
318 diagnostic(bool, InlineUnsafeOps, true, \
319 "Inline memory ops (native methods) from Unsafe") \
320 \
321 product(bool, CriticalJNINatives, true, \
322 "Check for critical JNI entry points") \
323 \
324 notproduct(bool, StressCriticalJNINatives, false, \
325 "Exercise register saving code in critical natives") \
326 \
327 diagnostic(bool, UseAESIntrinsics, false, \
328 "Use intrinsics for AES versions of crypto") \
329 \
330 diagnostic(bool, UseAESCTRIntrinsics, false, \
331 "Use intrinsics for the paralleled version of AES/CTR crypto") \
332 \
333 diagnostic(bool, UseSHA1Intrinsics, false, \
334 "Use intrinsics for SHA-1 crypto hash function. " \
335 "Requires that UseSHA is enabled.") \
336 \
337 diagnostic(bool, UseSHA256Intrinsics, false, \
338 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
339 "Requires that UseSHA is enabled.") \
340 \
341 diagnostic(bool, UseSHA512Intrinsics, false, \
342 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
343 "Requires that UseSHA is enabled.") \
344 \
345 diagnostic(bool, UseCRC32Intrinsics, false, \
346 "use intrinsics for java.util.zip.CRC32") \
347 \
348 diagnostic(bool, UseCRC32CIntrinsics, false, \
349 "use intrinsics for java.util.zip.CRC32C") \
350 \
351 diagnostic(bool, UseAdler32Intrinsics, false, \
352 "use intrinsics for java.util.zip.Adler32") \
353 \
354 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \
355 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
356 \
357 diagnostic(ccstrlist, DisableIntrinsic, "", \
358 "do not expand intrinsics whose (internal) names appear here") \
359 \
360 develop(bool, TraceCallFixup, false, \
361 "Trace all call fixups") \
362 \
363 develop(bool, DeoptimizeALot, false, \
364 "Deoptimize at every exit from the runtime system") \
365 \
366 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \
367 "A comma separated list of bcis to deoptimize at") \
368 \
369 develop(bool, DeoptimizeRandom, false, \
370 "Deoptimize random frames on random exit from the runtime system")\
371 \
372 notproduct(bool, ZombieALot, false, \
373 "Create zombies (non-entrant) at exit from the runtime system") \
374 \
375 notproduct(bool, WalkStackALot, false, \
376 "Trace stack (no print) at every exit from the runtime system") \
377 \
378 product(bool, Debugging, false, \
379 "Set when executing debug methods in debug.cpp " \
380 "(to prevent triggering assertions)") \
381 \
382 notproduct(bool, VerifyLastFrame, false, \
383 "Verify oops on last frame on entry to VM") \
384 \
385 product(bool, SafepointTimeout, false, \
386 "Time out and warn or fail after SafepointTimeoutDelay " \
387 "milliseconds if failed to reach safepoint") \
388 \
389 diagnostic(bool, AbortVMOnSafepointTimeout, false, \
390 "Abort upon failure to reach safepoint (see SafepointTimeout)") \
391 \
392 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \
393 "Abort upon failure to complete VM operation promptly") \
394 \
395 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \
396 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \
397 range(0, max_intx) \
398 \
399 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \
400 /* typically, at most a few retries are needed */ \
401 product(intx, SuspendRetryCount, 50, \
402 "Maximum retry count for an external suspend request") \
403 range(0, max_intx) \
404 \
405 product(intx, SuspendRetryDelay, 5, \
406 "Milliseconds to delay per retry (* current_retry_count)") \
407 range(0, max_intx) \
408 \
409 product(bool, AssertOnSuspendWaitFailure, false, \
410 "Assert/Guarantee on external suspend wait failure") \
411 \
412 product(bool, TraceSuspendWaitFailures, false, \
413 "Trace external suspend wait failures") \
414 \
415 product(bool, MaxFDLimit, true, \
416 "Bump the number of file descriptors to maximum in Solaris") \
417 \
418 diagnostic(bool, LogEvents, true, \
419 "Enable the various ring buffer event logs") \
420 \
421 diagnostic(uintx, LogEventsBufferEntries, 20, \
422 "Number of ring buffer event logs") \
423 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \
424 \
425 diagnostic(bool, BytecodeVerificationRemote, true, \
426 "Enable the Java bytecode verifier for remote classes") \
427 \
428 diagnostic(bool, BytecodeVerificationLocal, false, \
429 "Enable the Java bytecode verifier for local classes") \
430 \
431 develop(bool, ForceFloatExceptions, trueInDebug, \
432 "Force exceptions on FP stack under/overflow") \
433 \
434 develop(bool, VerifyStackAtCalls, false, \
435 "Verify that the stack pointer is unchanged after calls") \
436 \
437 develop(bool, TraceJavaAssertions, false, \
438 "Trace java language assertions") \
439 \
440 notproduct(bool, VerifyCodeCache, false, \
441 "Verify code cache on memory allocation/deallocation") \
442 \
443 develop(bool, UseMallocOnly, false, \
444 "Use only malloc/free for allocation (no resource area/arena)") \
445 \
446 develop(bool, ZapResourceArea, trueInDebug, \
447 "Zap freed resource/arena space with 0xABABABAB") \
448 \
449 notproduct(bool, ZapVMHandleArea, trueInDebug, \
450 "Zap freed VM handle space with 0xBCBCBCBC") \
451 \
452 notproduct(bool, ZapStackSegments, trueInDebug, \
453 "Zap allocated/freed stack segments with 0xFADFADED") \
454 \
455 develop(bool, ZapUnusedHeapArea, trueInDebug, \
456 "Zap unused heap space with 0xBAADBABE") \
457 \
458 develop(bool, CheckZapUnusedHeapArea, false, \
459 "Check zapping of unused heap space") \
460 \
461 develop(bool, ZapFillerObjects, trueInDebug, \
462 "Zap filler objects with 0xDEAFBABE") \
463 \
464 develop(bool, PrintVMMessages, true, \
465 "Print VM messages on console") \
466 \
467 notproduct(uintx, ErrorHandlerTest, 0, \
468 "If > 0, provokes an error after VM initialization; the value " \
469 "determines which error to provoke. See test_error_handler() " \
470 "in vmError.cpp.") \
471 \
472 notproduct(uintx, TestCrashInErrorHandler, 0, \
473 "If > 0, provokes an error inside VM error handler (a secondary " \
474 "crash). see test_error_handler() in vmError.cpp") \
475 \
476 notproduct(bool, TestSafeFetchInErrorHandler, false, \
477 "If true, tests SafeFetch inside error handler.") \
478 \
479 notproduct(bool, TestUnresponsiveErrorHandler, false, \
480 "If true, simulates an unresponsive error handler.") \
481 \
482 develop(bool, Verbose, false, \
483 "Print additional debugging information from other modes") \
484 \
485 develop(bool, PrintMiscellaneous, false, \
486 "Print uncategorized debugging information (requires +Verbose)") \
487 \
488 develop(bool, WizardMode, false, \
489 "Print much more debugging information") \
490 \
491 product(bool, ShowMessageBoxOnError, false, \
492 "Keep process alive on VM fatal error") \
493 \
494 product(bool, CreateCoredumpOnCrash, true, \
495 "Create core/mini dump on VM fatal error") \
496 \
497 product(uint64_t, ErrorLogTimeout, 2 * 60, \
498 "Timeout, in seconds, to limit the time spent on writing an " \
499 "error log in case of a crash.") \
500 range(0, (uint64_t)max_jlong/1000) \
501 \
502 product_pd(bool, UseOSErrorReporting, \
503 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \
504 \
505 product(bool, SuppressFatalErrorMessage, false, \
506 "Report NO fatal error message (avoid deadlock)") \
507 \
508 product(ccstrlist, OnError, "", \
509 "Run user-defined commands on fatal error; see VMError.cpp " \
510 "for examples") \
511 \
512 product(ccstrlist, OnOutOfMemoryError, "", \
513 "Run user-defined commands on first java.lang.OutOfMemoryError") \
514 \
515 manageable(bool, HeapDumpBeforeFullGC, false, \
516 "Dump heap to file before any major stop-the-world GC") \
517 \
518 manageable(bool, HeapDumpAfterFullGC, false, \
519 "Dump heap to file after any major stop-the-world GC") \
520 \
521 manageable(bool, HeapDumpOnOutOfMemoryError, false, \
522 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \
523 \
524 manageable(ccstr, HeapDumpPath, NULL, \
525 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \
526 "directory) of the dump file (defaults to java_pid<pid>.hprof " \
527 "in the working directory)") \
528 \
529 develop(bool, BreakAtWarning, false, \
530 "Execute breakpoint upon encountering VM warning") \
531 \
532 product(ccstr, NativeMemoryTracking, "off", \
533 "Native memory tracking options") \
534 \
535 diagnostic(bool, PrintNMTStatistics, false, \
536 "Print native memory tracking summary data if it is on") \
537 \
538 diagnostic(bool, LogCompilation, false, \
539 "Log compilation activity in detail to LogFile") \
540 \
541 product(bool, PrintCompilation, false, \
542 "Print compilations") \
543 \
544 product(bool, PrintExtendedThreadInfo, false, \
545 "Print more information in thread dump") \
546 \
547 diagnostic(intx, ScavengeRootsInCode, 2, \
548 "0: do not allow scavengable oops in the code cache; " \
549 "1: allow scavenging from the code cache; " \
550 "2: emit as many constants as the compiler can see") \
551 range(0, 2) \
552 \
553 product(bool, AlwaysRestoreFPU, false, \
554 "Restore the FPU control word after every JNI call (expensive)") \
555 \
556 diagnostic(bool, PrintCompilation2, false, \
557 "Print additional statistics per compilation") \
558 \
559 diagnostic(bool, PrintAdapterHandlers, false, \
560 "Print code generated for i2c/c2i adapters") \
561 \
562 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
563 "Verify that i2c/c2i adapters are called properly") \
564 \
565 develop(bool, VerifyAdapterSharing, false, \
566 "Verify that the code for shared adapters is the equivalent") \
567 \
568 diagnostic(bool, PrintAssembly, false, \
569 "Print assembly code (using external disassembler.so)") \
570 \
571 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
572 "Print options string passed to disassembler.so") \
573 \
574 notproduct(bool, PrintNMethodStatistics, false, \
575 "Print a summary statistic for the generated nmethods") \
576 \
577 diagnostic(bool, PrintNMethods, false, \
578 "Print assembly code for nmethods when generated") \
579 \
580 diagnostic(bool, PrintNativeNMethods, false, \
581 "Print assembly code for native nmethods when generated") \
582 \
583 develop(bool, PrintDebugInfo, false, \
584 "Print debug information for all nmethods when generated") \
585 \
586 develop(bool, PrintRelocations, false, \
587 "Print relocation information for all nmethods when generated") \
588 \
589 develop(bool, PrintDependencies, false, \
590 "Print dependency information for all nmethods when generated") \
591 \
592 develop(bool, PrintExceptionHandlers, false, \
593 "Print exception handler tables for all nmethods when generated") \
594 \
595 develop(bool, StressCompiledExceptionHandlers, false, \
596 "Exercise compiled exception handlers") \
597 \
598 develop(bool, InterceptOSException, false, \
599 "Start debugger when an implicit OS (e.g. NULL) " \
600 "exception happens") \
601 \
602 product(bool, PrintCodeCache, false, \
603 "Print the code cache memory usage when exiting") \
604 \
605 develop(bool, PrintCodeCache2, false, \
606 "Print detailed usage information on the code cache when exiting")\
607 \
608 product(bool, PrintCodeCacheOnCompilation, false, \
609 "Print the code cache memory usage each time a method is " \
610 "compiled") \
611 \
612 diagnostic(bool, PrintCodeHeapAnalytics, false, \
613 "Print code heap usage statistics on exit and on full condition") \
614 \
615 diagnostic(bool, PrintStubCode, false, \
616 "Print generated stub code") \
617 \
618 product(bool, StackTraceInThrowable, true, \
619 "Collect backtrace in throwable when exception happens") \
620 \
621 product(bool, OmitStackTraceInFastThrow, true, \
622 "Omit backtraces for some 'hot' exceptions in optimized code") \
623 \
624 manageable(bool, ShowCodeDetailsInExceptionMessages, false, \
625 "Show exception messages from RuntimeExceptions that contain " \
626 "snippets of the failing code. Disable this to improve privacy.") \
627 \
628 product(bool, PrintWarnings, true, \
629 "Print JVM warnings to output stream") \
630 \
631 notproduct(uintx, WarnOnStalledSpinLock, 0, \
632 "Print warnings for stalled SpinLocks") \
633 \
634 product(bool, RegisterFinalizersAtInit, true, \
635 "Register finalizable objects at end of Object.<init> or " \
636 "after allocation") \
637 \
638 develop(bool, RegisterReferences, true, \
639 "Tell whether the VM should register soft/weak/final/phantom " \
640 "references") \
641 \
642 develop(bool, IgnoreRewrites, false, \
643 "Suppress rewrites of bytecodes in the oopmap generator. " \
644 "This is unsafe!") \
645 \
646 develop(bool, PrintCodeCacheExtension, false, \
647 "Print extension of code cache") \
648 \
649 develop(bool, UsePrivilegedStack, true, \
650 "Enable the security JVM functions") \
651 \
652 develop(bool, ProtectionDomainVerification, true, \
653 "Verify protection domain before resolution in system dictionary")\
654 \
655 product(bool, ClassUnloading, true, \
656 "Do unloading of classes") \
657 \
658 product(bool, ClassUnloadingWithConcurrentMark, true, \
659 "Do unloading of classes with a concurrent marking cycle") \
660 \
661 develop(bool, DisableStartThread, false, \
662 "Disable starting of additional Java threads " \
663 "(for debugging only)") \
664 \
665 develop(bool, MemProfiling, false, \
666 "Write memory usage profiling to log file") \
667 \
668 notproduct(bool, PrintSystemDictionaryAtExit, false, \
669 "Print the system dictionary at exit") \
670 \
671 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \
672 "Dynamically resize system dictionaries as needed") \
673 \
674 product(bool, AlwaysLockClassLoader, false, \
675 "Require the VM to acquire the class loader lock before calling " \
676 "loadClass() even for class loaders registering " \
677 "as parallel capable") \
678 \
679 product(bool, AllowParallelDefineClass, false, \
680 "Allow parallel defineClass requests for class loaders " \
681 "registering as parallel capable") \
682 \
683 product_pd(bool, DontYieldALot, \
684 "Throw away obvious excess yield calls") \
685 \
686 develop(bool, UseDetachedThreads, true, \
687 "Use detached threads that are recycled upon termination " \
688 "(for Solaris only)") \
689 \
690 experimental(bool, DisablePrimordialThreadGuardPages, false, \
691 "Disable the use of stack guard pages if the JVM is loaded " \
692 "on the primordial process thread") \
693 \
694 product(bool, UseLWPSynchronization, true, \
695 "Use LWP-based instead of libthread-based synchronization " \
696 "(SPARC only)") \
697 \
698 product(intx, MonitorBound, 0, "(Deprecated) Bound Monitor population") \
699 range(0, max_jint) \
700 \
701 experimental(intx, MonitorUsedDeflationThreshold, 90, \
702 "Percentage of used monitors before triggering cleanup " \
703 "safepoint which deflates monitors (0 is off). " \
704 "The check is performed on GuaranteedSafepointInterval.") \
705 range(0, 100) \
706 \
707 experimental(intx, hashCode, 5, \
708 "(Unstable) select hashCode generation algorithm") \
709 \
710 product(bool, FilterSpuriousWakeups, true, \
711 "When true prevents OS-level spurious, or premature, wakeups " \
712 "from Object.wait (Ignored for Windows)") \
713 \
714 develop(bool, UsePthreads, false, \
715 "Use pthread-based instead of libthread-based synchronization " \
716 "(SPARC only)") \
717 \
718 product(bool, ReduceSignalUsage, false, \
719 "Reduce the use of OS signals in Java and/or the VM") \
720 \
721 develop(bool, LoadLineNumberTables, true, \
722 "Tell whether the class file parser loads line number tables") \
723 \
724 develop(bool, LoadLocalVariableTables, true, \
725 "Tell whether the class file parser loads local variable tables") \
726 \
727 develop(bool, LoadLocalVariableTypeTables, true, \
728 "Tell whether the class file parser loads local variable type" \
729 "tables") \
730 \
731 product(bool, AllowUserSignalHandlers, false, \
732 "Do not complain if the application installs signal handlers " \
733 "(Solaris & Linux only)") \
734 \
735 product(bool, UseSignalChaining, true, \
736 "Use signal-chaining to invoke signal handlers installed " \
737 "by the application (Solaris & Linux only)") \
738 \
739 product(bool, RestoreMXCSROnJNICalls, false, \
740 "Restore MXCSR when returning from JNI calls") \
741 \
742 product(bool, CheckJNICalls, false, \
743 "Verify all arguments to JNI calls") \
744 \
745 product(bool, UseFastJNIAccessors, true, \
746 "Use optimized versions of Get<Primitive>Field") \
747 \
748 product(intx, MaxJNILocalCapacity, 65536, \
749 "Maximum allowable local JNI handle capacity to " \
750 "EnsureLocalCapacity() and PushLocalFrame(), " \
751 "where <= 0 is unlimited, default: 65536") \
752 range(min_intx, max_intx) \
753 \
754 product(bool, EagerXrunInit, false, \
755 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
756 "but not all -Xrun libraries may support the state of the VM " \
757 "at this time") \
758 \
759 product(bool, PreserveAllAnnotations, false, \
760 "Preserve RuntimeInvisibleAnnotations as well " \
761 "as RuntimeVisibleAnnotations") \
762 \
763 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
764 "Number of OutOfMemoryErrors preallocated with backtrace") \
765 \
766 product(bool, UseXMMForArrayCopy, false, \
767 "Use SSE2 MOVQ instruction for Arraycopy") \
768 \
769 notproduct(bool, PrintFieldLayout, false, \
770 "Print field layout for each class") \
771 \
772 /* Need to limit the extent of the padding to reasonable size. */\
773 /* 8K is well beyond the reasonable HW cache line size, even with */\
774 /* aggressive prefetching, while still leaving the room for segregating */\
775 /* among the distinct pages. */\
776 product(intx, ContendedPaddingWidth, 128, \
777 "How many bytes to pad the fields/classes marked @Contended with")\
778 range(0, 8192) \
779 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
780 \
781 product(bool, EnableContended, true, \
782 "Enable @Contended annotation support") \
783 \
784 product(bool, RestrictContended, true, \
785 "Restrict @Contended to trusted classes") \
786 \
787 product(bool, UseBiasedLocking, true, \
788 "Enable biased locking in JVM") \
789 \
790 product(intx, BiasedLockingStartupDelay, 0, \
791 "Number of milliseconds to wait before enabling biased locking") \
792 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
793 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
794 \
795 diagnostic(bool, PrintBiasedLockingStatistics, false, \
796 "Print statistics of biased locking in JVM") \
797 \
798 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
799 "Threshold of number of revocations per type to try to " \
800 "rebias all objects in the heap of that type") \
801 range(0, max_intx) \
802 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
803 \
804 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
805 "Threshold of number of revocations per type to permanently " \
806 "revoke biases of all objects in the heap of that type") \
807 range(0, max_intx) \
808 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
809 \
810 product(intx, BiasedLockingDecayTime, 25000, \
811 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \
812 "type after previous bulk rebias") \
813 range(500, max_intx) \
814 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
815 \
816 product(bool, ExitOnOutOfMemoryError, false, \
817 "JVM exits on the first occurrence of an out-of-memory error") \
818 \
819 product(bool, CrashOnOutOfMemoryError, false, \
820 "JVM aborts, producing an error log and core/mini dump, on the " \
821 "first occurrence of an out-of-memory error") \
822 \
823 /* tracing */ \
824 \
825 develop(bool, StressRewriter, false, \
826 "Stress linktime bytecode rewriting") \
827 \
828 product(ccstr, TraceJVMTI, NULL, \
829 "Trace flags for JVMTI functions and events") \
830 \
831 /* This option can change an EMCP method into an obsolete method. */ \
832 /* This can affect tests that except specific methods to be EMCP. */ \
833 /* This option should be used with caution. */ \
834 product(bool, StressLdcRewrite, false, \
835 "Force ldc -> ldc_w rewrite during RedefineClasses") \
836 \
837 /* change to false by default sometime after Mustang */ \
838 product(bool, VerifyMergedCPBytecodes, true, \
839 "Verify bytecodes after RedefineClasses constant pool merging") \
840 \
841 product(bool, AllowRedefinitionToAddDeleteMethods, false, \
842 "(Deprecated) Allow redefinition to add and delete private " \
843 "static or final methods for compatibility with old releases") \
844 \
845 develop(bool, TraceBytecodes, false, \
846 "Trace bytecode execution") \
847 \
848 develop(bool, TraceICs, false, \
849 "Trace inline cache changes") \
850 \
851 notproduct(bool, TraceInvocationCounterOverflow, false, \
852 "Trace method invocation counter overflow") \
853 \
854 develop(bool, TraceInlineCacheClearing, false, \
855 "Trace clearing of inline caches in nmethods") \
856 \
857 develop(bool, TraceDependencies, false, \
858 "Trace dependencies") \
859 \
860 develop(bool, VerifyDependencies, trueInDebug, \
861 "Exercise and verify the compilation dependency mechanism") \
862 \
863 develop(bool, TraceNewOopMapGeneration, false, \
864 "Trace OopMapGeneration") \
865 \
866 develop(bool, TraceNewOopMapGenerationDetailed, false, \
867 "Trace OopMapGeneration: print detailed cell states") \
868 \
869 develop(bool, TimeOopMap, false, \
870 "Time calls to GenerateOopMap::compute_map() in sum") \
871 \
872 develop(bool, TimeOopMap2, false, \
873 "Time calls to GenerateOopMap::compute_map() individually") \
874 \
875 develop(bool, TraceOopMapRewrites, false, \
876 "Trace rewriting of method oops during oop map generation") \
877 \
878 develop(bool, TraceICBuffer, false, \
879 "Trace usage of IC buffer") \
880 \
881 develop(bool, TraceCompiledIC, false, \
882 "Trace changes of compiled IC") \
883 \
884 develop(bool, FLSVerifyDictionary, false, \
885 "Do lots of (expensive) FLS dictionary verification") \
886 \
887 \
888 notproduct(bool, CheckMemoryInitialization, false, \
889 "Check memory initialization") \
890 \
891 product(uintx, ProcessDistributionStride, 4, \
892 "Stride through processors when distributing processes") \
893 range(0, max_juint) \
894 \
895 develop(bool, TraceFinalizerRegistration, false, \
896 "Trace registration of final references") \
897 \
898 product(bool, IgnoreEmptyClassPaths, false, \
899 "Ignore empty path elements in -classpath") \
900 \
901 product(size_t, InitialBootClassLoaderMetaspaceSize, \
902 NOT_LP64(2200*K) LP64_ONLY(4*M), \
903 "Initial size of the boot class loader data metaspace") \
904 range(30*K, max_uintx/BytesPerWord) \
905 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
906 \
907 product(bool, PrintHeapAtSIGBREAK, true, \
908 "Print heap layout in response to SIGBREAK") \
909 \
910 manageable(bool, PrintClassHistogram, false, \
911 "Print a histogram of class instances") \
912 \
913 experimental(double, ObjectCountCutOffPercent, 0.5, \
914 "The percentage of the used heap that the instances of a class " \
915 "must occupy for the class to generate a trace event") \
916 range(0.0, 100.0) \
917 \
918 /* JVMTI heap profiling */ \
919 \
920 diagnostic(bool, TraceJVMTIObjectTagging, false, \
921 "Trace JVMTI object tagging calls") \
922 \
923 diagnostic(bool, VerifyBeforeIteration, false, \
924 "Verify memory system before JVMTI iteration") \
925 \
926 /* compiler interface */ \
927 \
928 develop(bool, CIPrintCompilerName, false, \
929 "when CIPrint is active, print the name of the active compiler") \
930 \
931 diagnostic(bool, CIPrintCompileQueue, false, \
932 "display the contents of the compile queue whenever a " \
933 "compilation is enqueued") \
934 \
935 develop(bool, CIPrintRequests, false, \
936 "display every request for compilation") \
937 \
938 product(bool, CITime, false, \
939 "collect timing information for compilation") \
940 \
941 develop(bool, CITimeVerbose, false, \
942 "be more verbose in compilation timings") \
943 \
944 develop(bool, CITimeEach, false, \
945 "display timing information after each successful compilation") \
946 \
947 develop(bool, CICountOSR, false, \
948 "use a separate counter when assigning ids to osr compilations") \
949 \
950 develop(bool, CICompileNatives, true, \
951 "compile native methods if supported by the compiler") \
952 \
953 develop_pd(bool, CICompileOSR, \
954 "compile on stack replacement methods if supported by the " \
955 "compiler") \
956 \
957 develop(bool, CIPrintMethodCodes, false, \
958 "print method bytecodes of the compiled code") \
959 \
960 develop(bool, CIPrintTypeFlow, false, \
961 "print the results of ciTypeFlow analysis") \
962 \
963 develop(bool, CITraceTypeFlow, false, \
964 "detailed per-bytecode tracing of ciTypeFlow analysis") \
965 \
966 develop(intx, OSROnlyBCI, -1, \
967 "OSR only at this bci. Negative values mean exclude that bci") \
968 \
969 /* compiler */ \
970 \
971 /* notice: the max range value here is max_jint, not max_intx */ \
972 /* because of overflow issue */ \
973 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
974 "Number of compiler threads to run") \
975 range(0, max_jint) \
976 constraint(CICompilerCountConstraintFunc, AfterErgo) \
977 \
978 product(bool, UseDynamicNumberOfCompilerThreads, true, \
979 "Dynamically choose the number of parallel compiler threads") \
980 \
981 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \
982 "Reduce the number of parallel compiler threads when they " \
983 "are not used") \
984 \
985 diagnostic(bool, TraceCompilerThreads, false, \
986 "Trace creation and removal of compiler threads") \
987 \
988 develop(bool, InjectCompilerCreationFailure, false, \
989 "Inject thread creation failures for " \
990 "UseDynamicNumberOfCompilerThreads") \
991 \
992 develop(bool, UseStackBanging, true, \
993 "use stack banging for stack overflow checks (required for " \
994 "proper StackOverflow handling; disable only to measure cost " \
995 "of stackbanging)") \
996 \
997 develop(bool, GenerateSynchronizationCode, true, \
998 "generate locking/unlocking code for synchronized methods and " \
999 "monitors") \
1000 \
1001 develop(bool, GenerateRangeChecks, true, \
1002 "Generate range checks for array accesses") \
1003 \
1004 diagnostic_pd(bool, ImplicitNullChecks, \
1005 "Generate code for implicit null checks") \
1006 \
1007 product_pd(bool, TrapBasedNullChecks, \
1008 "Generate code for null checks that uses a cmp and trap " \
1009 "instruction raising SIGTRAP. This is only used if an access to" \
1010 "null (+offset) will not raise a SIGSEGV, i.e.," \
1011 "ImplicitNullChecks don't work (PPC64).") \
1012 \
1013 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \
1014 "Enable Thread SMR extra validity checks") \
1015 \
1016 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \
1017 "Enable Thread SMR Statistics") \
1018 \
1019 product(bool, UseNotificationThread, true, \
1020 "Use Notification Thread") \
1021 \
1022 product(bool, Inline, true, \
1023 "Enable inlining") \
1024 \
1025 product(bool, ClipInlining, true, \
1026 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
1027 \
1028 develop(bool, UseCHA, true, \
1029 "Enable CHA") \
1030 \
1031 product(bool, UseTypeProfile, true, \
1032 "Check interpreter profile for historically monomorphic calls") \
1033 \
1034 diagnostic(bool, PrintInlining, false, \
1035 "Print inlining optimizations") \
1036 \
1037 product(bool, UsePopCountInstruction, false, \
1038 "Use population count instruction") \
1039 \
1040 develop(bool, EagerInitialization, false, \
1041 "Eagerly initialize classes if possible") \
1042 \
1043 diagnostic(bool, LogTouchedMethods, false, \
1044 "Log methods which have been ever touched in runtime") \
1045 \
1046 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
1047 "Print all methods that have been ever touched in runtime") \
1048 \
1049 develop(bool, TraceMethodReplacement, false, \
1050 "Print when methods are replaced do to recompilation") \
1051 \
1052 develop(bool, PrintMethodFlushing, false, \
1053 "Print the nmethods being flushed") \
1054 \
1055 diagnostic(bool, PrintMethodFlushingStatistics, false, \
1056 "print statistics about method flushing") \
1057 \
1058 diagnostic(intx, HotMethodDetectionLimit, 100000, \
1059 "Number of compiled code invocations after which " \
1060 "the method is considered as hot by the flusher") \
1061 range(1, max_jint) \
1062 \
1063 diagnostic(intx, MinPassesBeforeFlush, 10, \
1064 "Minimum number of sweeper passes before an nmethod " \
1065 "can be flushed") \
1066 range(0, max_intx) \
1067 \
1068 product(bool, UseCodeAging, true, \
1069 "Insert counter to detect warm methods") \
1070 \
1071 diagnostic(bool, StressCodeAging, false, \
1072 "Start with counters compiled in") \
1073 \
1074 develop(bool, StressCodeBuffers, false, \
1075 "Exercise code buffer expansion and other rare state changes") \
1076 \
1077 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
1078 "Generate extra debugging information for non-safepoints in " \
1079 "nmethods") \
1080 \
1081 product(bool, PrintVMOptions, false, \
1082 "Print flags that appeared on the command line") \
1083 \
1084 product(bool, IgnoreUnrecognizedVMOptions, false, \
1085 "Ignore unrecognized VM options") \
1086 \
1087 product(bool, PrintCommandLineFlags, false, \
1088 "Print flags specified on command line or set by ergonomics") \
1089 \
1090 product(bool, PrintFlagsInitial, false, \
1091 "Print all VM flags before argument processing and exit VM") \
1092 \
1093 product(bool, PrintFlagsFinal, false, \
1094 "Print all VM flags after argument and ergonomic processing") \
1095 \
1096 notproduct(bool, PrintFlagsWithComments, false, \
1097 "Print all VM flags with default values and descriptions and " \
1098 "exit") \
1099 \
1100 product(bool, PrintFlagsRanges, false, \
1101 "Print VM flags and their ranges") \
1102 \
1103 diagnostic(bool, SerializeVMOutput, true, \
1104 "Use a mutex to serialize output to tty and LogFile") \
1105 \
1106 diagnostic(bool, DisplayVMOutput, true, \
1107 "Display all VM output on the tty, independently of LogVMOutput") \
1108 \
1109 diagnostic(bool, LogVMOutput, false, \
1110 "Save VM output to LogFile") \
1111 \
1112 diagnostic(ccstr, LogFile, NULL, \
1113 "If LogVMOutput or LogCompilation is on, save VM output to " \
1114 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1115 \
1116 product(ccstr, ErrorFile, NULL, \
1117 "If an error occurs, save the error data to this file " \
1118 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
1119 \
1120 product(bool, ExtensiveErrorReports, \
1121 PRODUCT_ONLY(false) NOT_PRODUCT(true), \
1122 "Error reports are more extensive.") \
1123 \
1124 product(bool, DisplayVMOutputToStderr, false, \
1125 "If DisplayVMOutput is true, display all VM output to stderr") \
1126 \
1127 product(bool, DisplayVMOutputToStdout, false, \
1128 "If DisplayVMOutput is true, display all VM output to stdout") \
1129 \
1130 product(bool, ErrorFileToStderr, false, \
1131 "If true, error data is printed to stderr instead of a file") \
1132 \
1133 product(bool, ErrorFileToStdout, false, \
1134 "If true, error data is printed to stdout instead of a file") \
1135 \
1136 product(bool, UseHeavyMonitors, false, \
1137 "use heavyweight instead of lightweight Java monitors") \
1138 \
1139 product(bool, PrintStringTableStatistics, false, \
1140 "print statistics about the StringTable and SymbolTable") \
1141 \
1142 diagnostic(bool, VerifyStringTableAtExit, false, \
1143 "verify StringTable contents at exit") \
1144 \
1145 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
1146 "print histogram of the symbol table") \
1147 \
1148 notproduct(bool, ExitVMOnVerifyError, false, \
1149 "standard exit from VM if bytecode verify error " \
1150 "(only in debug mode)") \
1151 \
1152 diagnostic(ccstr, AbortVMOnException, NULL, \
1153 "Call fatal if this exception is thrown. Example: " \
1154 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1155 \
1156 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
1157 "Call fatal if the exception pointed by AbortVMOnException " \
1158 "has this message") \
1159 \
1160 develop(bool, DebugVtables, false, \
1161 "add debugging code to vtable dispatch") \
1162 \
1163 notproduct(bool, PrintVtableStats, false, \
1164 "print vtables stats at end of run") \
1165 \
1166 develop(bool, TraceCreateZombies, false, \
1167 "trace creation of zombie nmethods") \
1168 \
1169 product(bool, RangeCheckElimination, true, \
1170 "Eliminate range checks") \
1171 \
1172 develop_pd(bool, UncommonNullCast, \
1173 "track occurrences of null in casts; adjust compiler tactics") \
1174 \
1175 develop(bool, TypeProfileCasts, true, \
1176 "treat casts like calls for purposes of type profiling") \
1177 \
1178 develop(bool, TraceLivenessGen, false, \
1179 "Trace the generation of liveness analysis information") \
1180 \
1181 notproduct(bool, TraceLivenessQuery, false, \
1182 "Trace queries of liveness analysis information") \
1183 \
1184 notproduct(bool, CollectIndexSetStatistics, false, \
1185 "Collect information about IndexSets") \
1186 \
1187 develop(bool, UseLoopSafepoints, true, \
1188 "Generate Safepoint nodes in every loop") \
1189 \
1190 develop(intx, FastAllocateSizeLimit, 128*K, \
1191 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
1192 "Inline allocations larger than this in doublewords must go slow")\
1193 \
1194 product_pd(bool, CompactStrings, \
1195 "Enable Strings to use single byte chars in backing store") \
1196 \
1197 product_pd(uintx, TypeProfileLevel, \
1198 "=XYZ, with Z: Type profiling of arguments at call; " \
1199 "Y: Type profiling of return value at call; " \
1200 "X: Type profiling of parameters to methods; " \
1201 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
1202 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
1203 \
1204 product(intx, TypeProfileArgsLimit, 2, \
1205 "max number of call arguments to consider for type profiling") \
1206 range(0, 16) \
1207 \
1208 product(intx, TypeProfileParmsLimit, 2, \
1209 "max number of incoming parameters to consider for type profiling"\
1210 ", -1 for all") \
1211 range(-1, 64) \
1212 \
1213 /* statistics */ \
1214 develop(bool, CountCompiledCalls, false, \
1215 "Count method invocations") \
1216 \
1217 notproduct(bool, CountRuntimeCalls, false, \
1218 "Count VM runtime calls") \
1219 \
1220 develop(bool, CountJNICalls, false, \
1221 "Count jni method invocations") \
1222 \
1223 notproduct(bool, CountJVMCalls, false, \
1224 "Count jvm method invocations") \
1225 \
1226 notproduct(bool, CountRemovableExceptions, false, \
1227 "Count exceptions that could be replaced by branches due to " \
1228 "inlining") \
1229 \
1230 notproduct(bool, ICMissHistogram, false, \
1231 "Produce histogram of IC misses") \
1232 \
1233 /* interpreter */ \
1234 product_pd(bool, RewriteBytecodes, \
1235 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
1236 \
1237 product_pd(bool, RewriteFrequentPairs, \
1238 "Rewrite frequently used bytecode pairs into a single bytecode") \
1239 \
1240 diagnostic(bool, PrintInterpreter, false, \
1241 "Print the generated interpreter code") \
1242 \
1243 product(bool, UseInterpreter, true, \
1244 "Use interpreter for non-compiled methods") \
1245 \
1246 develop(bool, UseFastSignatureHandlers, true, \
1247 "Use fast signature handlers for native calls") \
1248 \
1249 product(bool, UseLoopCounter, true, \
1250 "Increment invocation counter on backward branch") \
1251 \
1252 product_pd(bool, UseOnStackReplacement, \
1253 "Use on stack replacement, calls runtime if invoc. counter " \
1254 "overflows in loop") \
1255 \
1256 notproduct(bool, TraceOnStackReplacement, false, \
1257 "Trace on stack replacement") \
1258 \
1259 product_pd(bool, PreferInterpreterNativeStubs, \
1260 "Use always interpreter stubs for native methods invoked via " \
1261 "interpreter") \
1262 \
1263 develop(bool, CountBytecodes, false, \
1264 "Count number of bytecodes executed") \
1265 \
1266 develop(bool, PrintBytecodeHistogram, false, \
1267 "Print histogram of the executed bytecodes") \
1268 \
1269 develop(bool, PrintBytecodePairHistogram, false, \
1270 "Print histogram of the executed bytecode pairs") \
1271 \
1272 diagnostic(bool, PrintSignatureHandlers, false, \
1273 "Print code generated for native method signature handlers") \
1274 \
1275 develop(bool, VerifyOops, false, \
1276 "Do plausibility checks for oops") \
1277 \
1278 develop(bool, CheckUnhandledOops, false, \
1279 "Check for unhandled oops in VM code") \
1280 \
1281 develop(bool, VerifyJNIFields, trueInDebug, \
1282 "Verify jfieldIDs for instance fields") \
1283 \
1284 notproduct(bool, VerifyJNIEnvThread, false, \
1285 "Verify JNIEnv.thread == Thread::current() when entering VM " \
1286 "from JNI") \
1287 \
1288 develop(bool, VerifyFPU, false, \
1289 "Verify FPU state (check for NaN's, etc.)") \
1290 \
1291 develop(bool, VerifyThread, false, \
1292 "Watch the thread register for corruption (SPARC only)") \
1293 \
1294 develop(bool, VerifyActivationFrameSize, false, \
1295 "Verify that activation frame didn't become smaller than its " \
1296 "minimal size") \
1297 \
1298 develop(bool, TraceFrequencyInlining, false, \
1299 "Trace frequency based inlining") \
1300 \
1301 develop_pd(bool, InlineIntrinsics, \
1302 "Inline intrinsics that can be statically resolved") \
1303 \
1304 product_pd(bool, ProfileInterpreter, \
1305 "Profile at the bytecode level during interpretation") \
1306 \
1307 develop(bool, TraceProfileInterpreter, false, \
1308 "Trace profiling at the bytecode level during interpretation. " \
1309 "This outputs the profiling information collected to improve " \
1310 "jit compilation.") \
1311 \
1312 develop_pd(bool, ProfileTraps, \
1313 "Profile deoptimization traps at the bytecode level") \
1314 \
1315 product(intx, ProfileMaturityPercentage, 20, \
1316 "number of method invocations/branches (expressed as % of " \
1317 "CompileThreshold) before using the method's profile") \
1318 range(0, 100) \
1319 \
1320 diagnostic(bool, PrintMethodData, false, \
1321 "Print the results of +ProfileInterpreter at end of run") \
1322 \
1323 develop(bool, VerifyDataPointer, trueInDebug, \
1324 "Verify the method data pointer during interpreter profiling") \
1325 \
1326 develop(bool, VerifyCompiledCode, false, \
1327 "Include miscellaneous runtime verifications in nmethod code; " \
1328 "default off because it disturbs nmethod size heuristics") \
1329 \
1330 notproduct(bool, CrashGCForDumpingJavaThread, false, \
1331 "Manually make GC thread crash then dump java stack trace; " \
1332 "Test only") \
1333 \
1334 /* compilation */ \
1335 product(bool, UseCompiler, true, \
1336 "Use Just-In-Time compilation") \
1337 \
1338 product(bool, UseCounterDecay, true, \
1339 "Adjust recompilation counters") \
1340 \
1341 develop(intx, CounterHalfLifeTime, 30, \
1342 "Half-life time of invocation counters (in seconds)") \
1343 \
1344 develop(intx, CounterDecayMinIntervalLength, 500, \
1345 "The minimum interval (in milliseconds) between invocation of " \
1346 "CounterDecay") \
1347 \
1348 product(bool, AlwaysCompileLoopMethods, false, \
1349 "When using recompilation, never interpret methods " \
1350 "containing loops") \
1351 \
1352 product(bool, DontCompileHugeMethods, true, \
1353 "Do not compile methods > HugeMethodLimit") \
1354 \
1355 /* Bytecode escape analysis estimation. */ \
1356 product(bool, EstimateArgEscape, true, \
1357 "Analyze bytecodes to estimate escape state of arguments") \
1358 \
1359 product(intx, BCEATraceLevel, 0, \
1360 "How much tracing to do of bytecode escape analysis estimates " \
1361 "(0-3)") \
1362 range(0, 3) \
1363 \
1364 product(intx, MaxBCEAEstimateLevel, 5, \
1365 "Maximum number of nested calls that are analyzed by BC EA") \
1366 range(0, max_jint) \
1367 \
1368 product(intx, MaxBCEAEstimateSize, 150, \
1369 "Maximum bytecode size of a method to be analyzed by BC EA") \
1370 range(0, max_jint) \
1371 \
1372 product(intx, AllocatePrefetchStyle, 1, \
1373 "0 = no prefetch, " \
1374 "1 = generate prefetch instructions for each allocation, " \
1375 "2 = use TLAB watermark to gate allocation prefetch, " \
1376 "3 = generate one prefetch instruction per cache line") \
1377 range(0, 3) \
1378 \
1379 product(intx, AllocatePrefetchDistance, -1, \
1380 "Distance to prefetch ahead of allocation pointer. " \
1381 "-1: use system-specific value (automatically determined") \
1382 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\
1383 \
1384 product(intx, AllocatePrefetchLines, 3, \
1385 "Number of lines to prefetch ahead of array allocation pointer") \
1386 range(1, 64) \
1387 \
1388 product(intx, AllocateInstancePrefetchLines, 1, \
1389 "Number of lines to prefetch ahead of instance allocation " \
1390 "pointer") \
1391 range(1, 64) \
1392 \
1393 product(intx, AllocatePrefetchStepSize, 16, \
1394 "Step size in bytes of sequential prefetch instructions") \
1395 range(1, 512) \
1396 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1397 \
1398 product(intx, AllocatePrefetchInstr, 0, \
1399 "Select instruction to prefetch ahead of allocation pointer") \
1400 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
1401 \
1402 /* deoptimization */ \
1403 develop(bool, TraceDeoptimization, false, \
1404 "Trace deoptimization") \
1405 \
1406 develop(bool, PrintDeoptimizationDetails, false, \
1407 "Print more information about deoptimization") \
1408 \
1409 develop(bool, DebugDeoptimization, false, \
1410 "Tracing various information while debugging deoptimization") \
1411 \
1412 product(intx, SelfDestructTimer, 0, \
1413 "Will cause VM to terminate after a given time (in minutes) " \
1414 "(0 means off)") \
1415 range(0, max_intx) \
1416 \
1417 product(intx, MaxJavaStackTraceDepth, 1024, \
1418 "The maximum number of lines in the stack trace for Java " \
1419 "exceptions (0 means all)") \
1420 range(0, max_jint/2) \
1421 \
1422 /* notice: the max range value here is max_jint, not max_intx */ \
1423 /* because of overflow issue */ \
1424 diagnostic(intx, GuaranteedSafepointInterval, 1000, \
1425 "Guarantee a safepoint (at least) every so many milliseconds " \
1426 "(0 means none)") \
1427 range(0, max_jint) \
1428 \
1429 product(intx, SafepointTimeoutDelay, 10000, \
1430 "Delay in milliseconds for option SafepointTimeout") \
1431 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
1432 NOT_LP64(range(0, max_intx)) \
1433 \
1434 product(intx, NmethodSweepActivity, 10, \
1435 "Removes cold nmethods from code cache if > 0. Higher values " \
1436 "result in more aggressive sweeping") \
1437 range(0, 2000) \
1438 \
1439 notproduct(bool, LogSweeper, false, \
1440 "Keep a ring buffer of sweeper activity") \
1441 \
1442 notproduct(intx, SweeperLogEntries, 1024, \
1443 "Number of records in the ring buffer of sweeper activity") \
1444 \
1445 notproduct(intx, MemProfilingInterval, 500, \
1446 "Time between each invocation of the MemProfiler") \
1447 \
1448 develop(intx, MallocCatchPtr, -1, \
1449 "Hit breakpoint when mallocing/freeing this pointer") \
1450 \
1451 notproduct(ccstrlist, SuppressErrorAt, "", \
1452 "List of assertions (file:line) to muzzle") \
1453 \
1454 develop(intx, StackPrintLimit, 100, \
1455 "number of stack frames to print in VM-level stack dump") \
1456 \
1457 notproduct(intx, MaxElementPrintSize, 256, \
1458 "maximum number of elements to print") \
1459 \
1460 notproduct(intx, MaxSubklassPrintSize, 4, \
1461 "maximum number of subklasses to print when printing klass") \
1462 \
1463 product(intx, MaxInlineLevel, 15, \
1464 "maximum number of nested calls that are inlined") \
1465 range(0, max_jint) \
1466 \
1467 product(intx, MaxRecursiveInlineLevel, 1, \
1468 "maximum number of nested recursive calls that are inlined") \
1469 range(0, max_jint) \
1470 \
1471 develop(intx, MaxForceInlineLevel, 100, \
1472 "maximum number of nested calls that are forced for inlining " \
1473 "(using CompileCommand or marked w/ @ForceInline)") \
1474 range(0, max_jint) \
1475 \
1476 product_pd(intx, InlineSmallCode, \
1477 "Only inline already compiled methods if their code size is " \
1478 "less than this") \
1479 range(0, max_jint) \
1480 \
1481 product(intx, MaxInlineSize, 35, \
1482 "The maximum bytecode size of a method to be inlined") \
1483 range(0, max_jint) \
1484 \
1485 product_pd(intx, FreqInlineSize, \
1486 "The maximum bytecode size of a frequent method to be inlined") \
1487 range(0, max_jint) \
1488 \
1489 product(intx, MaxTrivialSize, 6, \
1490 "The maximum bytecode size of a trivial method to be inlined") \
1491 range(0, max_jint) \
1492 \
1493 product(intx, MinInliningThreshold, 250, \
1494 "The minimum invocation count a method needs to have to be " \
1495 "inlined") \
1496 range(0, max_jint) \
1497 \
1498 develop(intx, MethodHistogramCutoff, 100, \
1499 "The cutoff value for method invocation histogram (+CountCalls)") \
1500 \
1501 develop(intx, DontYieldALotInterval, 10, \
1502 "Interval between which yields will be dropped (milliseconds)") \
1503 \
1504 notproduct(intx, DeoptimizeALotInterval, 5, \
1505 "Number of exits until DeoptimizeALot kicks in") \
1506 \
1507 notproduct(intx, ZombieALotInterval, 5, \
1508 "Number of exits until ZombieALot kicks in") \
1509 \
1510 diagnostic(uintx, MallocMaxTestWords, 0, \
1511 "If non-zero, maximum number of words that malloc/realloc can " \
1512 "allocate (for testing only)") \
1513 range(0, max_uintx) \
1514 \
1515 product(intx, TypeProfileWidth, 2, \
1516 "Number of receiver types to record in call/cast profile") \
1517 range(0, 8) \
1518 \
1519 develop(intx, BciProfileWidth, 2, \
1520 "Number of return bci's to record in ret profile") \
1521 \
1522 product(intx, PerMethodRecompilationCutoff, 400, \
1523 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1524 range(-1, max_intx) \
1525 \
1526 product(intx, PerBytecodeRecompilationCutoff, 200, \
1527 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
1528 range(-1, max_intx) \
1529 \
1530 product(intx, PerMethodTrapLimit, 100, \
1531 "Limit on traps (of one kind) in a method (includes inlines)") \
1532 range(0, max_jint) \
1533 \
1534 experimental(intx, PerMethodSpecTrapLimit, 5000, \
1535 "Limit on speculative traps (of one kind) in a method " \
1536 "(includes inlines)") \
1537 range(0, max_jint) \
1538 \
1539 product(intx, PerBytecodeTrapLimit, 4, \
1540 "Limit on traps (of one kind) at a particular BCI") \
1541 range(0, max_jint) \
1542 \
1543 experimental(intx, SpecTrapLimitExtraEntries, 3, \
1544 "Extra method data trap entries for speculation") \
1545 \
1546 develop(intx, InlineFrequencyRatio, 20, \
1547 "Ratio of call site execution to caller method invocation") \
1548 range(0, max_jint) \
1549 \
1550 diagnostic_pd(intx, InlineFrequencyCount, \
1551 "Count of call site execution necessary to trigger frequent " \
1552 "inlining") \
1553 range(0, max_jint) \
1554 \
1555 develop(intx, InlineThrowCount, 50, \
1556 "Force inlining of interpreted methods that throw this often") \
1557 range(0, max_jint) \
1558 \
1559 develop(intx, InlineThrowMaxSize, 200, \
1560 "Force inlining of throwing methods smaller than this") \
1561 range(0, max_jint) \
1562 \
1563 develop(intx, ProfilerNodeSize, 1024, \
1564 "Size in K to allocate for the Profile Nodes of each thread") \
1565 range(0, 1024) \
1566 \
1567 product_pd(size_t, MetaspaceSize, \
1568 "Initial threshold (in bytes) at which a garbage collection " \
1569 "is done to reduce Metaspace usage") \
1570 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
1571 \
1572 product(size_t, MaxMetaspaceSize, max_uintx, \
1573 "Maximum size of Metaspaces (in bytes)") \
1574 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
1575 \
1576 product(size_t, CompressedClassSpaceSize, 1*G, \
1577 "Maximum size of class area in Metaspace when compressed " \
1578 "class pointers are used") \
1579 range(1*M, 3*G) \
1580 \
1581 manageable(uintx, MinHeapFreeRatio, 40, \
1582 "The minimum percentage of heap free after GC to avoid expansion."\
1583 " For most GCs this applies to the old generation. In G1 and" \
1584 " ParallelGC it applies to the whole heap.") \
1585 range(0, 100) \
1586 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
1587 \
1588 manageable(uintx, MaxHeapFreeRatio, 70, \
1589 "The maximum percentage of heap free after GC to avoid shrinking."\
1590 " For most GCs this applies to the old generation. In G1 and" \
1591 " ParallelGC it applies to the whole heap.") \
1592 range(0, 100) \
1593 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
1594 \
1595 product(bool, ShrinkHeapInSteps, true, \
1596 "When disabled, informs the GC to shrink the java heap directly" \
1597 " to the target size at the next full GC rather than requiring" \
1598 " smaller steps during multiple full GCs.") \
1599 \
1600 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
1601 "Number of milliseconds per MB of free space in the heap") \
1602 range(0, max_intx) \
1603 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1604 \
1605 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
1606 "The minimum change in heap space due to GC (in bytes)") \
1607 range(0, max_uintx) \
1608 \
1609 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
1610 "The minimum expansion of Metaspace (in bytes)") \
1611 range(0, max_uintx) \
1612 \
1613 product(uintx, MaxMetaspaceFreeRatio, 70, \
1614 "The maximum percentage of Metaspace free after GC to avoid " \
1615 "shrinking") \
1616 range(0, 100) \
1617 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
1618 \
1619 product(uintx, MinMetaspaceFreeRatio, 40, \
1620 "The minimum percentage of Metaspace free after GC to avoid " \
1621 "expansion") \
1622 range(0, 99) \
1623 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
1624 \
1625 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
1626 "The maximum expansion of Metaspace without full GC (in bytes)") \
1627 range(0, max_uintx) \
1628 \
1629 /* stack parameters */ \
1630 product_pd(intx, StackYellowPages, \
1631 "Number of yellow zone (recoverable overflows) pages of size " \
1632 "4KB. If pages are bigger yellow zone is aligned up.") \
1633 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
1634 \
1635 product_pd(intx, StackRedPages, \
1636 "Number of red zone (unrecoverable overflows) pages of size " \
1637 "4KB. If pages are bigger red zone is aligned up.") \
1638 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
1639 \
1640 product_pd(intx, StackReservedPages, \
1641 "Number of reserved zone (reserved to annotated methods) pages" \
1642 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1643 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1644 \
1645 product(bool, RestrictReservedStack, true, \
1646 "Restrict @ReservedStackAccess to trusted classes") \
1647 \
1648 /* greater stack shadow pages can't generate instruction to bang stack */ \
1649 product_pd(intx, StackShadowPages, \
1650 "Number of shadow zone (for overflow checking) pages of size " \
1651 "4KB. If pages are bigger shadow zone is aligned up. " \
1652 "This should exceed the depth of the VM and native call stack.") \
1653 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
1654 \
1655 product_pd(intx, ThreadStackSize, \
1656 "Thread Stack Size (in Kbytes)") \
1657 range(0, 1 * M) \
1658 \
1659 product_pd(intx, VMThreadStackSize, \
1660 "Non-Java Thread Stack Size (in Kbytes)") \
1661 range(0, max_intx/(1 * K)) \
1662 \
1663 product_pd(intx, CompilerThreadStackSize, \
1664 "Compiler Thread Stack Size (in Kbytes)") \
1665 range(0, max_intx/(1 * K)) \
1666 \
1667 develop_pd(size_t, JVMInvokeMethodSlack, \
1668 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
1669 \
1670 /* code cache parameters */ \
1671 develop_pd(uintx, CodeCacheSegmentSize, \
1672 "Code cache segment size (in bytes) - smallest unit of " \
1673 "allocation") \
1674 range(1, 1024) \
1675 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
1676 \
1677 develop_pd(intx, CodeEntryAlignment, \
1678 "Code entry alignment for generated code (in bytes)") \
1679 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
1680 \
1681 product_pd(intx, OptoLoopAlignment, \
1682 "Align inner loops to zero relative to this modulus") \
1683 range(1, 16) \
1684 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
1685 \
1686 product_pd(uintx, InitialCodeCacheSize, \
1687 "Initial code cache size (in bytes)") \
1688 range(os::vm_page_size(), max_uintx) \
1689 \
1690 develop_pd(uintx, CodeCacheMinimumUseSpace, \
1691 "Minimum code cache size (in bytes) required to start VM.") \
1692 range(0, max_uintx) \
1693 \
1694 product(bool, SegmentedCodeCache, false, \
1695 "Use a segmented code cache") \
1696 \
1697 product_pd(uintx, ReservedCodeCacheSize, \
1698 "Reserved code cache size (in bytes) - maximum code cache size") \
1699 range(os::vm_page_size(), max_uintx) \
1700 \
1701 product_pd(uintx, NonProfiledCodeHeapSize, \
1702 "Size of code heap with non-profiled methods (in bytes)") \
1703 range(0, max_uintx) \
1704 \
1705 product_pd(uintx, ProfiledCodeHeapSize, \
1706 "Size of code heap with profiled methods (in bytes)") \
1707 range(0, max_uintx) \
1708 \
1709 product_pd(uintx, NonNMethodCodeHeapSize, \
1710 "Size of code heap with non-nmethods (in bytes)") \
1711 range(os::vm_page_size(), max_uintx) \
1712 \
1713 product_pd(uintx, CodeCacheExpansionSize, \
1714 "Code cache expansion size (in bytes)") \
1715 range(32*K, max_uintx) \
1716 \
1717 diagnostic_pd(uintx, CodeCacheMinBlockLength, \
1718 "Minimum number of segments in a code cache block") \
1719 range(1, 100) \
1720 \
1721 notproduct(bool, ExitOnFullCodeCache, false, \
1722 "Exit the VM if we fill the code cache") \
1723 \
1724 product(bool, UseCodeCacheFlushing, true, \
1725 "Remove cold/old nmethods from the code cache") \
1726 \
1727 product(uintx, StartAggressiveSweepingAt, 10, \
1728 "Start aggressive sweeping if X[%] of the code cache is free." \
1729 "Segmented code cache: X[%] of the non-profiled heap." \
1730 "Non-segmented code cache: X[%] of the total code cache") \
1731 range(0, 100) \
1732 \
1733 /* AOT parameters */ \
1734 experimental(bool, UseAOT, false, \
1735 "Use AOT compiled files") \
1736 \
1737 experimental(ccstrlist, AOTLibrary, NULL, \
1738 "AOT library") \
1739 \
1740 experimental(bool, PrintAOT, false, \
1741 "Print used AOT klasses and methods") \
1742 \
1743 notproduct(bool, PrintAOTStatistics, false, \
1744 "Print AOT statistics") \
1745 \
1746 diagnostic(bool, UseAOTStrictLoading, false, \
1747 "Exit the VM if any of the AOT libraries has invalid config") \
1748 \
1749 product(bool, CalculateClassFingerprint, false, \
1750 "Calculate class fingerprint") \
1751 \
1752 /* interpreter debugging */ \
1753 develop(intx, BinarySwitchThreshold, 5, \
1754 "Minimal number of lookupswitch entries for rewriting to binary " \
1755 "switch") \
1756 \
1757 develop(intx, StopInterpreterAt, 0, \
1758 "Stop interpreter execution at specified bytecode number") \
1759 \
1760 develop(intx, TraceBytecodesAt, 0, \
1761 "Trace bytecodes starting with specified bytecode number") \
1762 \
1763 /* compiler interface */ \
1764 develop(intx, CIStart, 0, \
1765 "The id of the first compilation to permit") \
1766 \
1767 develop(intx, CIStop, max_jint, \
1768 "The id of the last compilation to permit") \
1769 \
1770 develop(intx, CIStartOSR, 0, \
1771 "The id of the first osr compilation to permit " \
1772 "(CICountOSR must be on)") \
1773 \
1774 develop(intx, CIStopOSR, max_jint, \
1775 "The id of the last osr compilation to permit " \
1776 "(CICountOSR must be on)") \
1777 \
1778 develop(intx, CIBreakAtOSR, -1, \
1779 "The id of osr compilation to break at") \
1780 \
1781 develop(intx, CIBreakAt, -1, \
1782 "The id of compilation to break at") \
1783 \
1784 product(ccstrlist, CompileOnly, "", \
1785 "List of methods (pkg/class.name) to restrict compilation to") \
1786 \
1787 product(ccstr, CompileCommandFile, NULL, \
1788 "Read compiler commands from this file [.hotspot_compiler]") \
1789 \
1790 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
1791 "Read compiler directives from this file") \
1792 \
1793 product(ccstrlist, CompileCommand, "", \
1794 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
1795 \
1796 develop(bool, ReplayCompiles, false, \
1797 "Enable replay of compilations from ReplayDataFile") \
1798 \
1799 product(ccstr, ReplayDataFile, NULL, \
1800 "File containing compilation replay information" \
1801 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
1802 \
1803 product(ccstr, InlineDataFile, NULL, \
1804 "File containing inlining replay information" \
1805 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
1806 \
1807 develop(intx, ReplaySuppressInitializers, 2, \
1808 "Control handling of class initialization during replay: " \
1809 "0 - don't do anything special; " \
1810 "1 - treat all class initializers as empty; " \
1811 "2 - treat class initializers for application classes as empty; " \
1812 "3 - allow all class initializers to run during bootstrap but " \
1813 " pretend they are empty after starting replay") \
1814 range(0, 3) \
1815 \
1816 develop(bool, ReplayIgnoreInitErrors, false, \
1817 "Ignore exceptions thrown during initialization for replay") \
1818 \
1819 product(bool, DumpReplayDataOnError, true, \
1820 "Record replay data for crashing compiler threads") \
1821 \
1822 product(bool, CICompilerCountPerCPU, false, \
1823 "1 compiler thread for log(N CPUs)") \
1824 \
1825 notproduct(intx, CICrashAt, -1, \
1826 "id of compilation to trigger assert in compiler thread for " \
1827 "the purpose of testing, e.g. generation of replay data") \
1828 notproduct(bool, CIObjectFactoryVerify, false, \
1829 "enable potentially expensive verification in ciObjectFactory") \
1830 \
1831 diagnostic(bool, AbortVMOnCompilationFailure, false, \
1832 "Abort VM when method had failed to compile.") \
1833 \
1834 /* Priorities */ \
1835 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
1836 \
1837 product(intx, ThreadPriorityPolicy, 0, \
1838 "0 : Normal. "\
1839 " VM chooses priorities that are appropriate for normal "\
1840 " applications. On Solaris NORM_PRIORITY and above are mapped "\
1841 " to normal native priority. Java priorities below " \
1842 " NORM_PRIORITY map to lower native priority values. On "\
1843 " Windows applications are allowed to use higher native "\
1844 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
1845 " not use the highest possible native priority, "\
1846 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
1847 " system threads. On Linux thread priorities are ignored "\
1848 " because the OS does not support static priority in "\
1849 " SCHED_OTHER scheduling class which is the only choice for "\
1850 " non-root, non-realtime applications. "\
1851 "1 : Aggressive. "\
1852 " Java thread priorities map over to the entire range of "\
1853 " native thread priorities. Higher Java thread priorities map "\
1854 " to higher native thread priorities. This policy should be "\
1855 " used with care, as sometimes it can cause performance "\
1856 " degradation in the application and/or the entire system. On "\
1857 " Linux/BSD/macOS this policy requires root privilege or an "\
1858 " extended capability.") \
1859 range(0, 1) \
1860 \
1861 product(bool, ThreadPriorityVerbose, false, \
1862 "Print priority changes") \
1863 \
1864 product(intx, CompilerThreadPriority, -1, \
1865 "The native priority at which compiler threads should run " \
1866 "(-1 means no change)") \
1867 range(min_jint, max_jint) \
1868 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \
1869 \
1870 product(intx, VMThreadPriority, -1, \
1871 "The native priority at which the VM thread should run " \
1872 "(-1 means no change)") \
1873 range(-1, 127) \
1874 \
1875 product(intx, JavaPriority1_To_OSPriority, -1, \
1876 "Map Java priorities to OS priorities") \
1877 range(-1, 127) \
1878 \
1879 product(intx, JavaPriority2_To_OSPriority, -1, \
1880 "Map Java priorities to OS priorities") \
1881 range(-1, 127) \
1882 \
1883 product(intx, JavaPriority3_To_OSPriority, -1, \
1884 "Map Java priorities to OS priorities") \
1885 range(-1, 127) \
1886 \
1887 product(intx, JavaPriority4_To_OSPriority, -1, \
1888 "Map Java priorities to OS priorities") \
1889 range(-1, 127) \
1890 \
1891 product(intx, JavaPriority5_To_OSPriority, -1, \
1892 "Map Java priorities to OS priorities") \
1893 range(-1, 127) \
1894 \
1895 product(intx, JavaPriority6_To_OSPriority, -1, \
1896 "Map Java priorities to OS priorities") \
1897 range(-1, 127) \
1898 \
1899 product(intx, JavaPriority7_To_OSPriority, -1, \
1900 "Map Java priorities to OS priorities") \
1901 range(-1, 127) \
1902 \
1903 product(intx, JavaPriority8_To_OSPriority, -1, \
1904 "Map Java priorities to OS priorities") \
1905 range(-1, 127) \
1906 \
1907 product(intx, JavaPriority9_To_OSPriority, -1, \
1908 "Map Java priorities to OS priorities") \
1909 range(-1, 127) \
1910 \
1911 product(intx, JavaPriority10_To_OSPriority,-1, \
1912 "Map Java priorities to OS priorities") \
1913 range(-1, 127) \
1914 \
1915 experimental(bool, UseCriticalJavaThreadPriority, false, \
1916 "Java thread priority 10 maps to critical scheduling priority") \
1917 \
1918 experimental(bool, UseCriticalCompilerThreadPriority, false, \
1919 "Compiler thread(s) run at critical scheduling priority") \
1920 \
1921 develop(intx, NewCodeParameter, 0, \
1922 "Testing Only: Create a dedicated integer parameter before " \
1923 "putback") \
1924 \
1925 /* new oopmap storage allocation */ \
1926 develop(intx, MinOopMapAllocation, 8, \
1927 "Minimum number of OopMap entries in an OopMapSet") \
1928 \
1929 /* Background Compilation */ \
1930 develop(intx, LongCompileThreshold, 50, \
1931 "Used with +TraceLongCompiles") \
1932 \
1933 /* recompilation */ \
1934 product_pd(intx, CompileThreshold, \
1935 "number of interpreted method invocations before (re-)compiling") \
1936 constraint(CompileThresholdConstraintFunc, AfterErgo) \
1937 \
1938 product(double, CompileThresholdScaling, 1.0, \
1939 "Factor to control when first compilation happens " \
1940 "(both with and without tiered compilation): " \
1941 "values greater than 1.0 delay counter overflow, " \
1942 "values between 0 and 1.0 rush counter overflow, " \
1943 "value of 1.0 leaves compilation thresholds unchanged " \
1944 "value of 0.0 is equivalent to -Xint. " \
1945 "" \
1946 "Flag can be set as per-method option. " \
1947 "If a value is specified for a method, compilation thresholds " \
1948 "for that method are scaled by both the value of the global flag "\
1949 "and the value of the per-method flag.") \
1950 range(0.0, DBL_MAX) \
1951 \
1952 product(intx, Tier0InvokeNotifyFreqLog, 7, \
1953 "Interpreter (tier 0) invocation notification frequency") \
1954 range(0, 30) \
1955 \
1956 product(intx, Tier2InvokeNotifyFreqLog, 11, \
1957 "C1 without MDO (tier 2) invocation notification frequency") \
1958 range(0, 30) \
1959 \
1960 product(intx, Tier3InvokeNotifyFreqLog, 10, \
1961 "C1 with MDO profiling (tier 3) invocation notification " \
1962 "frequency") \
1963 range(0, 30) \
1964 \
1965 product(intx, Tier23InlineeNotifyFreqLog, 20, \
1966 "Inlinee invocation (tiers 2 and 3) notification frequency") \
1967 range(0, 30) \
1968 \
1969 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
1970 "Interpreter (tier 0) invocation notification frequency") \
1971 range(0, 30) \
1972 \
1973 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
1974 "C1 without MDO (tier 2) invocation notification frequency") \
1975 range(0, 30) \
1976 \
1977 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
1978 "C1 with MDO profiling (tier 3) invocation notification " \
1979 "frequency") \
1980 range(0, 30) \
1981 \
1982 product(intx, Tier2CompileThreshold, 0, \
1983 "threshold at which tier 2 compilation is invoked") \
1984 range(0, max_jint) \
1985 \
1986 product(intx, Tier2BackEdgeThreshold, 0, \
1987 "Back edge threshold at which tier 2 compilation is invoked") \
1988 range(0, max_jint) \
1989 \
1990 product(intx, Tier3InvocationThreshold, 200, \
1991 "Compile if number of method invocations crosses this " \
1992 "threshold") \
1993 range(0, max_jint) \
1994 \
1995 product(intx, Tier3MinInvocationThreshold, 100, \
1996 "Minimum invocation to compile at tier 3") \
1997 range(0, max_jint) \
1998 \
1999 product(intx, Tier3CompileThreshold, 2000, \
2000 "Threshold at which tier 3 compilation is invoked (invocation " \
2001 "minimum must be satisfied)") \
2002 range(0, max_jint) \
2003 \
2004 product(intx, Tier3BackEdgeThreshold, 60000, \
2005 "Back edge threshold at which tier 3 OSR compilation is invoked") \
2006 range(0, max_jint) \
2007 \
2008 product(intx, Tier3AOTInvocationThreshold, 10000, \
2009 "Compile if number of method invocations crosses this " \
2010 "threshold if coming from AOT") \
2011 range(0, max_jint) \
2012 \
2013 product(intx, Tier3AOTMinInvocationThreshold, 1000, \
2014 "Minimum invocation to compile at tier 3 if coming from AOT") \
2015 range(0, max_jint) \
2016 \
2017 product(intx, Tier3AOTCompileThreshold, 15000, \
2018 "Threshold at which tier 3 compilation is invoked (invocation " \
2019 "minimum must be satisfied) if coming from AOT") \
2020 range(0, max_jint) \
2021 \
2022 product(intx, Tier3AOTBackEdgeThreshold, 120000, \
2023 "Back edge threshold at which tier 3 OSR compilation is invoked " \
2024 "if coming from AOT") \
2025 range(0, max_jint) \
2026 \
2027 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \
2028 "Switch to interpreter to profile if the number of method " \
2029 "invocations crosses this threshold if coming from AOT " \
2030 "(applicable only with " \
2031 "CompilationMode=high-only|high-only-quick-internal)") \
2032 range(0, max_jint) \
2033 \
2034 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \
2035 "Minimum number of invocations to switch to interpreter " \
2036 "to profile if coming from AOT " \
2037 "(applicable only with " \
2038 "CompilationMode=high-only|high-only-quick-internal)") \
2039 range(0, max_jint) \
2040 \
2041 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \
2042 "Threshold at which to switch to interpreter to profile " \
2043 "if coming from AOT " \
2044 "(invocation minimum must be satisfied, " \
2045 "applicable only with " \
2046 "CompilationMode=high-only|high-only-quick-internal)") \
2047 range(0, max_jint) \
2048 \
2049 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \
2050 "Back edge threshold at which to switch to interpreter " \
2051 "to profile if coming from AOT " \
2052 "(applicable only with " \
2053 "CompilationMode=high-only|high-only-quick-internal)") \
2054 range(0, max_jint) \
2055 \
2056 product(intx, Tier4InvocationThreshold, 5000, \
2057 "Compile if number of method invocations crosses this " \
2058 "threshold") \
2059 range(0, max_jint) \
2060 \
2061 product(intx, Tier4MinInvocationThreshold, 600, \
2062 "Minimum invocation to compile at tier 4") \
2063 range(0, max_jint) \
2064 \
2065 product(intx, Tier4CompileThreshold, 15000, \
2066 "Threshold at which tier 4 compilation is invoked (invocation " \
2067 "minimum must be satisfied)") \
2068 range(0, max_jint) \
2069 \
2070 product(intx, Tier4BackEdgeThreshold, 40000, \
2071 "Back edge threshold at which tier 4 OSR compilation is invoked") \
2072 range(0, max_jint) \
2073 \
2074 diagnostic(intx, Tier40InvocationThreshold, 5000, \
2075 "Compile if number of method invocations crosses this " \
2076 "threshold (applicable only with " \
2077 "CompilationMode=high-only|high-only-quick-internal)") \
2078 range(0, max_jint) \
2079 \
2080 diagnostic(intx, Tier40MinInvocationThreshold, 600, \
2081 "Minimum number of invocations to compile at tier 4 " \
2082 "(applicable only with " \
2083 "CompilationMode=high-only|high-only-quick-internal)") \
2084 range(0, max_jint) \
2085 \
2086 diagnostic(intx, Tier40CompileThreshold, 10000, \
2087 "Threshold at which tier 4 compilation is invoked (invocation " \
2088 "minimum must be satisfied, applicable only with " \
2089 "CompilationMode=high-only|high-only-quick-internal)") \
2090 range(0, max_jint) \
2091 \
2092 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \
2093 "Back edge threshold at which tier 4 OSR compilation is invoked " \
2094 "(applicable only with " \
2095 "CompilationMode=high-only|high-only-quick-internal)") \
2096 range(0, max_jint) \
2097 \
2098 diagnostic(intx, Tier0Delay, 5, \
2099 "If C2 queue size grows over this amount per compiler thread " \
2100 "do not start profiling in the interpreter " \
2101 "(applicable only with " \
2102 "CompilationMode=high-only|high-only-quick-internal)") \
2103 range(0, max_jint) \
2104 \
2105 product(intx, Tier3DelayOn, 5, \
2106 "If C2 queue size grows over this amount per compiler thread " \
2107 "stop compiling at tier 3 and start compiling at tier 2") \
2108 range(0, max_jint) \
2109 \
2110 product(intx, Tier3DelayOff, 2, \
2111 "If C2 queue size is less than this amount per compiler thread " \
2112 "allow methods compiled at tier 2 transition to tier 3") \
2113 range(0, max_jint) \
2114 \
2115 product(intx, Tier3LoadFeedback, 5, \
2116 "Tier 3 thresholds will increase twofold when C1 queue size " \
2117 "reaches this amount per compiler thread") \
2118 range(0, max_jint) \
2119 \
2120 product(intx, Tier4LoadFeedback, 3, \
2121 "Tier 4 thresholds will increase twofold when C2 queue size " \
2122 "reaches this amount per compiler thread") \
2123 range(0, max_jint) \
2124 \
2125 product(intx, TieredCompileTaskTimeout, 50, \
2126 "Kill compile task if method was not used within " \
2127 "given timeout in milliseconds") \
2128 range(0, max_intx) \
2129 \
2130 product(intx, TieredStopAtLevel, 4, \
2131 "Stop at given compilation level") \
2132 range(0, 4) \
2133 \
2134 product(intx, Tier0ProfilingStartPercentage, 200, \
2135 "Start profiling in interpreter if the counters exceed tier 3 " \
2136 "thresholds (tier 4 thresholds with " \
2137 "CompilationMode=high-only|high-only-quick-internal)" \
2138 "by the specified percentage") \
2139 range(0, max_jint) \
2140 \
2141 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
2142 "Increase the compile threshold for C1 compilation if the code " \
2143 "cache is filled by the specified percentage") \
2144 range(0, 99) \
2145 \
2146 product(intx, TieredRateUpdateMinTime, 1, \
2147 "Minimum rate sampling interval (in milliseconds)") \
2148 range(0, max_intx) \
2149 \
2150 product(intx, TieredRateUpdateMaxTime, 25, \
2151 "Maximum rate sampling interval (in milliseconds)") \
2152 range(0, max_intx) \
2153 \
2154 product(ccstr, CompilationMode, "default", \
2155 "Compilation modes: " \
2156 "default: normal tiered compilation; " \
2157 "quick-only: C1-only mode; " \
2158 "high-only: C2/JVMCI-only mode; " \
2159 "high-only-quick-internal: C2/JVMCI-only mode, " \
2160 "with JVMCI compiler compiled with C1.") \
2161 \
2162 product_pd(bool, TieredCompilation, \
2163 "Enable tiered compilation") \
2164 \
2165 product(bool, PrintTieredEvents, false, \
2166 "Print tiered events notifications") \
2167 \
2168 product_pd(intx, OnStackReplacePercentage, \
2169 "NON_TIERED number of method invocations/branches (expressed as " \
2170 "% of CompileThreshold) before (re-)compiling OSR code") \
2171 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
2172 \
2173 product(intx, InterpreterProfilePercentage, 33, \
2174 "NON_TIERED number of method invocations/branches (expressed as " \
2175 "% of CompileThreshold) before profiling in the interpreter") \
2176 range(0, 100) \
2177 \
2178 develop(intx, DesiredMethodLimit, 8000, \
2179 "The desired maximum method size (in bytecodes) after inlining") \
2180 \
2181 develop(intx, HugeMethodLimit, 8000, \
2182 "Don't compile methods larger than this if " \
2183 "+DontCompileHugeMethods") \
2184 \
2185 /* Properties for Java libraries */ \
2186 \
2187 product(uint64_t, MaxDirectMemorySize, 0, \
2188 "Maximum total size of NIO direct-buffer allocations") \
2189 range(0, max_jlong) \
2190 \
2191 /* Flags used for temporary code during development */ \
2192 \
2193 diagnostic(bool, UseNewCode, false, \
2194 "Testing Only: Use the new version while testing") \
2195 \
2196 diagnostic(bool, UseNewCode2, false, \
2197 "Testing Only: Use the new version while testing") \
2198 \
2199 diagnostic(bool, UseNewCode3, false, \
2200 "Testing Only: Use the new version while testing") \
2201 \
2202 /* flags for performance data collection */ \
2203 \
2204 product(bool, UsePerfData, true, \
2205 "Flag to disable jvmstat instrumentation for performance testing "\
2206 "and problem isolation purposes") \
2207 \
2208 product(bool, PerfDataSaveToFile, false, \
2209 "Save PerfData memory to hsperfdata_<pid> file on exit") \
2210 \
2211 product(ccstr, PerfDataSaveFile, NULL, \
2212 "Save PerfData memory to the specified absolute pathname. " \
2213 "The string %p in the file name (if present) " \
2214 "will be replaced by pid") \
2215 \
2216 product(intx, PerfDataSamplingInterval, 50, \
2217 "Data sampling interval (in milliseconds)") \
2218 range(PeriodicTask::min_interval, max_jint) \
2219 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
2220 \
2221 product(bool, PerfDisableSharedMem, false, \
2222 "Store performance data in standard memory") \
2223 \
2224 product(intx, PerfDataMemorySize, 32*K, \
2225 "Size of performance data memory region. Will be rounded " \
2226 "up to a multiple of the native os page size.") \
2227 range(128, 32*64*K) \
2228 \
2229 product(intx, PerfMaxStringConstLength, 1024, \
2230 "Maximum PerfStringConstant string length before truncation") \
2231 range(32, 32*K) \
2232 \
2233 product(bool, PerfAllowAtExitRegistration, false, \
2234 "Allow registration of atexit() methods") \
2235 \
2236 product(bool, PerfBypassFileSystemCheck, false, \
2237 "Bypass Win32 file system criteria checks (Windows Only)") \
2238 \
2239 product(intx, UnguardOnExecutionViolation, 0, \
2240 "Unguard page and retry on no-execute fault (Win32 only) " \
2241 "0=off, 1=conservative, 2=aggressive") \
2242 range(0, 2) \
2243 \
2244 /* Serviceability Support */ \
2245 \
2246 product(bool, ManagementServer, false, \
2247 "Create JMX Management Server") \
2248 \
2249 product(bool, DisableAttachMechanism, false, \
2250 "Disable mechanism that allows tools to attach to this VM") \
2251 \
2252 product(bool, StartAttachListener, false, \
2253 "Always start Attach Listener at VM startup") \
2254 \
2255 product(bool, EnableDynamicAgentLoading, true, \
2256 "Allow tools to load agents with the attach mechanism") \
2257 \
2258 manageable(bool, PrintConcurrentLocks, false, \
2259 "Print java.util.concurrent locks in thread dump") \
2260 \
2261 /* Shared spaces */ \
2262 \
2263 product(bool, UseSharedSpaces, true, \
2264 "Use shared spaces for metadata") \
2265 \
2266 product(bool, VerifySharedSpaces, false, \
2267 "Verify integrity of shared spaces") \
2268 \
2269 product(bool, RequireSharedSpaces, false, \
2270 "Require shared spaces for metadata") \
2271 \
2272 product(bool, DumpSharedSpaces, false, \
2273 "Special mode: JVM reads a class list, loads classes, builds " \
2274 "shared spaces, and dumps the shared spaces to a file to be " \
2275 "used in future JVM runs") \
2276 \
2277 product(bool, DynamicDumpSharedSpaces, false, \
2278 "Dynamic archive") \
2279 \
2280 product(bool, PrintSharedArchiveAndExit, false, \
2281 "Print shared archive file contents") \
2282 \
2283 product(bool, PrintSharedDictionary, false, \
2284 "If PrintSharedArchiveAndExit is true, also print the shared " \
2285 "dictionary") \
2286 \
2287 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
2288 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
2289 "Address to allocate shared memory region for class data") \
2290 range(0, SIZE_MAX) \
2291 \
2292 product(ccstr, SharedArchiveConfigFile, NULL, \
2293 "Data to add to the CDS archive file") \
2294 \
2295 product(uintx, SharedSymbolTableBucketSize, 4, \
2296 "Average number of symbols per bucket in shared table") \
2297 range(2, 246) \
2298 \
2299 diagnostic(bool, AllowArchivingWithJavaAgent, false, \
2300 "Allow Java agent to be run with CDS dumping") \
2301 \
2302 diagnostic(bool, PrintMethodHandleStubs, false, \
2303 "Print generated stub code for method handles") \
2304 \
2305 develop(bool, TraceMethodHandles, false, \
2306 "trace internal method handle operations") \
2307 \
2308 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
2309 "perform extra checks when constructing method handles") \
2310 \
2311 diagnostic(bool, ShowHiddenFrames, false, \
2312 "show method handle implementation frames (usually hidden)") \
2313 \
2314 experimental(bool, TrustFinalNonStaticFields, false, \
2315 "trust final non-static declarations for constant folding") \
2316 \
2317 diagnostic(bool, FoldStableValues, true, \
2318 "Optimize loads from stable fields (marked w/ @Stable)") \
2319 \
2320 develop(bool, TraceInvokeDynamic, false, \
2321 "trace internal invoke dynamic operations") \
2322 \
2323 diagnostic(int, UseBootstrapCallInfo, 1, \
2324 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2325 "resolved before the bootstrap method is called; 1: when a BSM " \
2326 "that may accept a BootstrapCallInfo is detected, use that API " \
2327 "to pass BSM arguments, which allows the BSM to delay their " \
2328 "resolution; 2+: stress test the BCI API by calling more BSMs " \
2329 "via that API, instead of with the eagerly-resolved array.") \
2330 \
2331 diagnostic(bool, PauseAtStartup, false, \
2332 "Causes the VM to pause at startup time and wait for the pause " \
2333 "file to be removed (default: ./vm.paused.<pid>)") \
2334 \
2335 diagnostic(ccstr, PauseAtStartupFile, NULL, \
2336 "The file to create and for whose removal to await when pausing " \
2337 "at startup. (default: ./vm.paused.<pid>)") \
2338 \
2339 diagnostic(bool, PauseAtExit, false, \
2340 "Pause and wait for keypress on exit if a debugger is attached") \
2341 \
2342 product(bool, ExtendedDTraceProbes, false, \
2343 "Enable performance-impacting dtrace probes") \
2344 \
2345 product(bool, DTraceMethodProbes, false, \
2346 "Enable dtrace probes for method-entry and method-exit") \
2347 \
2348 product(bool, DTraceAllocProbes, false, \
2349 "Enable dtrace probes for object allocation") \
2350 \
2351 product(bool, DTraceMonitorProbes, false, \
2352 "Enable dtrace probes for monitor events") \
2353 \
2354 product(bool, RelaxAccessControlCheck, false, \
2355 "Relax the access control checks in the verifier") \
2356 \
2357 product(uintx, StringTableSize, defaultStringTableSize, \
2358 "Number of buckets in the interned String table " \
2359 "(will be rounded to nearest higher power of 2)") \
2360 range(minimumStringTableSize, 16777216ul /* 2^24 */) \
2361 \
2362 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
2363 "Number of buckets in the JVM internal Symbol table") \
2364 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \
2365 \
2366 product(bool, UseStringDeduplication, false, \
2367 "Use string deduplication") \
2368 \
2369 product(uintx, StringDeduplicationAgeThreshold, 3, \
2370 "A string must reach this age (or be promoted to an old region) " \
2371 "to be considered for deduplication") \
2372 range(1, markWord::max_age) \
2373 \
2374 diagnostic(bool, StringDeduplicationResizeALot, false, \
2375 "Force table resize every time the table is scanned") \
2376 \
2377 diagnostic(bool, StringDeduplicationRehashALot, false, \
2378 "Force table rehash every time the table is scanned") \
2379 \
2380 diagnostic(bool, WhiteBoxAPI, false, \
2381 "Enable internal testing APIs") \
2382 \
2383 experimental(intx, SurvivorAlignmentInBytes, 0, \
2384 "Default survivor space alignment in bytes") \
2385 range(8, 256) \
2386 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
2387 \
2388 product(ccstr, DumpLoadedClassList, NULL, \
2389 "Dump the names all loaded classes, that could be stored into " \
2390 "the CDS archive, in the specified file") \
2391 \
2392 product(ccstr, SharedClassListFile, NULL, \
2393 "Override the default CDS class list") \
2394 \
2395 product(ccstr, SharedArchiveFile, NULL, \
2396 "Override the default location of the CDS archive file") \
2397 \
2398 product(ccstr, ArchiveClassesAtExit, NULL, \
2399 "The path and name of the dynamic archive file") \
2400 \
2401 product(ccstr, ExtraSharedClassListFile, NULL, \
2402 "Extra classlist for building the CDS archive file") \
2403 \
2404 diagnostic(intx, ArchiveRelocationMode, 0, \
2405 "(0) first map at preferred address, and if " \
2406 "unsuccessful, map at alternative address (default); " \
2407 "(1) always map at alternative address; " \
2408 "(2) always map at preferred address, and if unsuccessful, " \
2409 "do not map the archive") \
2410 range(0, 2) \
2411 \
2412 experimental(size_t, ArrayAllocatorMallocLimit, \
2413 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \
2414 "Allocation less than this value will be allocated " \
2415 "using malloc. Larger allocations will use mmap.") \
2416 \
2417 experimental(bool, AlwaysAtomicAccesses, false, \
2418 "Accesses to all variables should always be atomic") \
2419 \
2420 diagnostic(bool, UseUnalignedAccesses, false, \
2421 "Use unaligned memory accesses in Unsafe") \
2422 \
2423 product_pd(bool, PreserveFramePointer, \
2424 "Use the FP register for holding the frame pointer " \
2425 "and not as a general purpose register.") \
2426 \
2427 diagnostic(bool, CheckIntrinsics, true, \
2428 "When a class C is loaded, check that " \
2429 "(1) all intrinsics defined by the VM for class C are present "\
2430 "in the loaded class file and are marked with the " \
2431 "@HotSpotIntrinsicCandidate annotation, that " \
2432 "(2) there is an intrinsic registered for all loaded methods " \
2433 "that are annotated with the @HotSpotIntrinsicCandidate " \
2434 "annotation, and that " \
2435 "(3) no orphan methods exist for class C (i.e., methods for " \
2436 "which the VM declares an intrinsic but that are not declared "\
2437 "in the loaded class C. " \
2438 "Check (3) is available only in debug builds.") \
2439 \
2440 diagnostic_pd(intx, InitArrayShortSize, \
2441 "Threshold small size (in bytes) for clearing arrays. " \
2442 "Anything this size or smaller may get converted to discrete " \
2443 "scalar stores.") \
2444 range(0, max_intx) \
2445 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
2446 \
2447 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
2448 "Disable backwards compatibility for compile commands.") \
2449 \
2450 diagnostic(bool, CompilerDirectivesPrint, false, \
2451 "Print compiler directives on installation.") \
2452 diagnostic(int, CompilerDirectivesLimit, 50, \
2453 "Limit on number of compiler directives.") \
2454 \
2455 product(ccstr, AllocateHeapAt, NULL, \
2456 "Path to the directoy where a temporary file will be created " \
2457 "to use as the backing store for Java Heap.") \
2458 \
2459 experimental(ccstr, AllocateOldGenAt, NULL, \
2460 "Path to the directoy where a temporary file will be " \
2461 "created to use as the backing store for old generation." \
2462 "File of size Xmx is pre-allocated for performance reason, so" \
2463 "we need that much space available") \
2464 \
2465 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \
2466 "Run periodic metaspace verifications (0 - none, " \
2467 "1 - always, >1 every nth interval)") \
2468 \
2469 diagnostic(bool, ShowRegistersOnAssert, true, \
2470 "On internal errors, include registers in error report.") \
2471 \
2472 diagnostic(bool, UseSwitchProfiling, true, \
2473 "leverage profiling for table/lookup switch") \
2474 \
2475 develop(bool, TraceMemoryWriteback, false, \
2476 "Trace memory writeback operations") \
2477 \
2478 JFR_ONLY(product(bool, FlightRecorder, false, \
2479 "(Deprecated) Enable Flight Recorder")) \
2480 \
2481 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \
2482 "Flight Recorder options")) \
2483 \
2484 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \
2485 "Start flight recording with options")) \
2486 \
2487 experimental(bool, UseFastUnorderedTimeStamps, false, \
2488 "Use platform unstable time where supported for timestamps only") \
2489 \
2490 product(bool, UseNewFieldLayout, true, \
2491 "(Deprecated) Use new algorithm to compute field layouts") \
2492 \
2493 product(bool, UseEmptySlotsInSupers, true, \
2494 "Allow allocating fields in empty slots of super-classes") \
2495 \
2496 TSAN_ONLY(product(bool, ThreadSanitizer, false, \
2497 "Enable ThreadSanitizer lock instrumentation")) \
2498 \
2499 TSAN_ONLY(product(bool, ThreadSanitizerJavaMemory, true, \
2500 "Detect Java data races with ThreadSanitizer. " \
2501 "This is only enabled if -XX:+ThreadSanitizer is set.")) \
2502 \
2503 TSAN_ONLY(product(ccstr, ThreadSanitizerIgnoreFile, NULL, \
2504 "File containing a list of ignored field patterns for " \
2505 "ThreadSanitizer.")) \
2506
2507
2508 // Interface macros
2509 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2510 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
2511 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
2512 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name;
2513 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
2514 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
2515 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
2516 #ifdef PRODUCT
2517 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
2518 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
2519 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
2520 #else
2521 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
2522 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
2523 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2524 #endif // PRODUCT
2525 // Special LP64 flags, product only needed for now.
2526 #ifdef _LP64
2527 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2528 #else
2529 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
2530 #endif // _LP64
2531
2532 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \
2533 DECLARE_PD_DEVELOPER_FLAG, \
2534 DECLARE_PRODUCT_FLAG, \
2535 DECLARE_PD_PRODUCT_FLAG, \
2536 DECLARE_DIAGNOSTIC_FLAG, \
2537 DECLARE_PD_DIAGNOSTIC_FLAG, \
2538 DECLARE_EXPERIMENTAL_FLAG, \
2539 DECLARE_NOTPRODUCT_FLAG, \
2540 DECLARE_MANAGEABLE_FLAG, \
2541 DECLARE_PRODUCT_RW_FLAG, \
2542 DECLARE_LP64_PRODUCT_FLAG, \
2543 IGNORE_RANGE, \
2544 IGNORE_CONSTRAINT)
2545
2546 #endif // SHARE_RUNTIME_GLOBALS_HPP