rev 60538 : imported patch jep387-all.patch
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 "(Deprecated) 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 "(Deprecated) 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(bool, UseAES, false, \
218 "Control whether AES instructions are used when available") \
219 \
220 product(bool, UseFMA, false, \
221 "Control whether FMA instructions are used when available") \
222 \
223 product(bool, UseSHA, false, \
224 "Control whether SHA instructions are used when available") \
225 \
226 diagnostic(bool, UseGHASHIntrinsics, false, \
227 "Use intrinsics for GHASH versions of crypto") \
228 \
229 product(bool, UseBASE64Intrinsics, false, \
230 "Use intrinsics for java.util.Base64") \
231 \
232 product(size_t, LargePageSizeInBytes, 0, \
233 "Large page size (0 to let VM choose the page size)") \
234 range(0, max_uintx) \
235 \
236 product(size_t, LargePageHeapSizeThreshold, 128*M, \
237 "Use large pages if maximum heap is at least this big") \
238 range(0, max_uintx) \
239 \
240 product(bool, ForceTimeHighResolution, false, \
241 "Using high time resolution (for Win32 only)") \
242 \
243 develop(bool, TracePcPatching, false, \
244 "Trace usage of frame::patch_pc") \
245 \
246 develop(bool, TraceRelocator, false, \
247 "Trace the bytecode relocator") \
248 \
249 develop(bool, TraceLongCompiles, false, \
250 "Print out every time compilation is longer than " \
251 "a given threshold") \
252 \
253 diagnostic(bool, SafepointALot, false, \
254 "Generate a lot of safepoints. This works with " \
255 "GuaranteedSafepointInterval") \
256 \
257 diagnostic(bool, HandshakeALot, false, \
258 "Generate a lot of handshakes. This works with " \
259 "GuaranteedSafepointInterval") \
260 \
261 product_pd(bool, BackgroundCompilation, \
262 "A thread requesting compilation is not blocked during " \
263 "compilation") \
264 \
265 product(bool, MethodFlushing, true, \
266 "Reclamation of zombie and not-entrant methods") \
267 \
268 develop(bool, VerifyStack, false, \
269 "Verify stack of each thread when it is entering a runtime call") \
270 \
271 diagnostic(bool, ForceUnreachable, false, \
272 "Make all non code cache addresses to be unreachable by " \
273 "forcing use of 64bit literal fixups") \
274 \
275 notproduct(bool, StressDerivedPointers, false, \
276 "Force scavenge when a derived pointer is detected on stack " \
277 "after rtm call") \
278 \
279 develop(bool, TraceDerivedPointers, false, \
280 "Trace traversal of derived pointers on stack") \
281 \
282 notproduct(bool, TraceCodeBlobStacks, false, \
283 "Trace stack-walk of codeblobs") \
284 \
285 notproduct(bool, PrintRewrites, false, \
286 "Print methods that are being rewritten") \
287 \
288 product(bool, UseInlineCaches, true, \
289 "Use Inline Caches for virtual calls ") \
290 \
291 diagnostic(bool, InlineArrayCopy, true, \
292 "Inline arraycopy native that is known to be part of " \
293 "base library DLL") \
294 \
295 diagnostic(bool, InlineObjectHash, true, \
296 "Inline Object::hashCode() native that is known to be part " \
297 "of base library DLL") \
298 \
299 diagnostic(bool, InlineNatives, true, \
300 "Inline natives that are known to be part of base library DLL") \
301 \
302 diagnostic(bool, InlineMathNatives, true, \
303 "Inline SinD, CosD, etc.") \
304 \
305 diagnostic(bool, InlineClassNatives, true, \
306 "Inline Class.isInstance, etc") \
307 \
308 diagnostic(bool, InlineThreadNatives, true, \
309 "Inline Thread.currentThread, etc") \
310 \
311 diagnostic(bool, InlineUnsafeOps, true, \
312 "Inline memory ops (native methods) from Unsafe") \
313 \
314 product(bool, CriticalJNINatives, true, \
315 "Check for critical JNI entry points") \
316 \
317 notproduct(bool, StressCriticalJNINatives, false, \
318 "Exercise register saving code in critical natives") \
319 \
320 diagnostic(bool, UseAESIntrinsics, false, \
321 "Use intrinsics for AES versions of crypto") \
322 \
323 diagnostic(bool, UseAESCTRIntrinsics, false, \
324 "Use intrinsics for the paralleled version of AES/CTR crypto") \
325 \
326 diagnostic(bool, UseMD5Intrinsics, false, \
327 "Use intrinsics for MD5 crypto hash function") \
328 \
329 diagnostic(bool, UseSHA1Intrinsics, false, \
330 "Use intrinsics for SHA-1 crypto hash function. " \
331 "Requires that UseSHA is enabled.") \
332 \
333 diagnostic(bool, UseSHA256Intrinsics, false, \
334 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \
335 "Requires that UseSHA is enabled.") \
336 \
337 diagnostic(bool, UseSHA512Intrinsics, false, \
338 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \
339 "Requires that UseSHA is enabled.") \
340 \
341 diagnostic(bool, UseCRC32Intrinsics, false, \
342 "use intrinsics for java.util.zip.CRC32") \
343 \
344 diagnostic(bool, UseCRC32CIntrinsics, false, \
345 "use intrinsics for java.util.zip.CRC32C") \
346 \
347 diagnostic(bool, UseAdler32Intrinsics, false, \
348 "use intrinsics for java.util.zip.Adler32") \
349 \
350 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \
351 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
352 \
353 diagnostic(ccstrlist, DisableIntrinsic, "", \
354 "do not expand intrinsics whose (internal) names appear here") \
355 \
356 diagnostic(ccstrlist, ControlIntrinsic, "", \
357 "Control intrinsics using a list of +/- (internal) names, " \
358 "separated by commas") \
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 (Unix only)") \
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 diagnostic(intx, RepeatCompilation, 0, \
545 "Repeat compilation without installing code (number of times)") \
546 range(0, max_jint) \
547 \
548 product(bool, PrintExtendedThreadInfo, false, \
549 "Print more information in thread dump") \
550 \
551 diagnostic(intx, ScavengeRootsInCode, 2, \
552 "0: do not allow scavengable oops in the code cache; " \
553 "1: allow scavenging from the code cache; " \
554 "2: emit as many constants as the compiler can see") \
555 range(0, 2) \
556 \
557 product(bool, AlwaysRestoreFPU, false, \
558 "Restore the FPU control word after every JNI call (expensive)") \
559 \
560 diagnostic(bool, PrintCompilation2, false, \
561 "Print additional statistics per compilation") \
562 \
563 diagnostic(bool, PrintAdapterHandlers, false, \
564 "Print code generated for i2c/c2i adapters") \
565 \
566 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \
567 "Verify that i2c/c2i adapters are called properly") \
568 \
569 develop(bool, VerifyAdapterSharing, false, \
570 "Verify that the code for shared adapters is the equivalent") \
571 \
572 diagnostic(bool, PrintAssembly, false, \
573 "Print assembly code (using external disassembler.so)") \
574 \
575 diagnostic(ccstr, PrintAssemblyOptions, NULL, \
576 "Print options string passed to disassembler.so") \
577 \
578 notproduct(bool, PrintNMethodStatistics, false, \
579 "Print a summary statistic for the generated nmethods") \
580 \
581 diagnostic(bool, PrintNMethods, false, \
582 "Print assembly code for nmethods when generated") \
583 \
584 diagnostic(bool, PrintNativeNMethods, false, \
585 "Print assembly code for native nmethods when generated") \
586 \
587 develop(bool, PrintDebugInfo, false, \
588 "Print debug information for all nmethods when generated") \
589 \
590 develop(bool, PrintRelocations, false, \
591 "Print relocation information for all nmethods when generated") \
592 \
593 develop(bool, PrintDependencies, false, \
594 "Print dependency information for all nmethods when generated") \
595 \
596 develop(bool, PrintExceptionHandlers, false, \
597 "Print exception handler tables for all nmethods when generated") \
598 \
599 develop(bool, StressCompiledExceptionHandlers, false, \
600 "Exercise compiled exception handlers") \
601 \
602 develop(bool, InterceptOSException, false, \
603 "Start debugger when an implicit OS (e.g. NULL) " \
604 "exception happens") \
605 \
606 product(bool, PrintCodeCache, false, \
607 "Print the code cache memory usage when exiting") \
608 \
609 develop(bool, PrintCodeCache2, false, \
610 "Print detailed usage information on the code cache when exiting")\
611 \
612 product(bool, PrintCodeCacheOnCompilation, false, \
613 "Print the code cache memory usage each time a method is " \
614 "compiled") \
615 \
616 diagnostic(bool, PrintCodeHeapAnalytics, false, \
617 "Print code heap usage statistics on exit and on full condition") \
618 \
619 diagnostic(bool, PrintStubCode, false, \
620 "Print generated stub code") \
621 \
622 product(bool, StackTraceInThrowable, true, \
623 "Collect backtrace in throwable when exception happens") \
624 \
625 product(bool, OmitStackTraceInFastThrow, true, \
626 "Omit backtraces for some 'hot' exceptions in optimized code") \
627 \
628 manageable(bool, ShowCodeDetailsInExceptionMessages, true, \
629 "Show exception messages from RuntimeExceptions that contain " \
630 "snippets of the failing code. Disable this to improve privacy.") \
631 \
632 product(bool, PrintWarnings, true, \
633 "Print JVM warnings to output stream") \
634 \
635 notproduct(uintx, WarnOnStalledSpinLock, 0, \
636 "Print warnings for stalled SpinLocks") \
637 \
638 product(bool, RegisterFinalizersAtInit, true, \
639 "Register finalizable objects at end of Object.<init> or " \
640 "after allocation") \
641 \
642 develop(bool, RegisterReferences, true, \
643 "Tell whether the VM should register soft/weak/final/phantom " \
644 "references") \
645 \
646 develop(bool, IgnoreRewrites, false, \
647 "Suppress rewrites of bytecodes in the oopmap generator. " \
648 "This is unsafe!") \
649 \
650 develop(bool, PrintCodeCacheExtension, false, \
651 "Print extension of code cache") \
652 \
653 develop(bool, UsePrivilegedStack, true, \
654 "Enable the security JVM functions") \
655 \
656 develop(bool, ProtectionDomainVerification, true, \
657 "Verify protection domain before resolution in system dictionary")\
658 \
659 product(bool, ClassUnloading, true, \
660 "Do unloading of classes") \
661 \
662 product(bool, ClassUnloadingWithConcurrentMark, true, \
663 "Do unloading of classes with a concurrent marking cycle") \
664 \
665 develop(bool, DisableStartThread, false, \
666 "Disable starting of additional Java threads " \
667 "(for debugging only)") \
668 \
669 develop(bool, MemProfiling, false, \
670 "Write memory usage profiling to log file") \
671 \
672 notproduct(bool, PrintSystemDictionaryAtExit, false, \
673 "Print the system dictionary at exit") \
674 \
675 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \
676 "Dynamically resize system dictionaries as needed") \
677 \
678 product(bool, AlwaysLockClassLoader, false, \
679 "Require the VM to acquire the class loader lock before calling " \
680 "loadClass() even for class loaders registering " \
681 "as parallel capable") \
682 \
683 product(bool, AllowParallelDefineClass, false, \
684 "Allow parallel defineClass requests for class loaders " \
685 "registering as parallel capable") \
686 \
687 product_pd(bool, DontYieldALot, \
688 "Throw away obvious excess yield calls") \
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 /* notice: the max range value here is max_jint, not max_intx */ \
695 /* because of overflow issue */ \
696 diagnostic(intx, AsyncDeflationInterval, 250, \
697 "Async deflate idle monitors every so many milliseconds when " \
698 "MonitorUsedDeflationThreshold is exceeded (0 is off).") \
699 range(0, max_jint) \
700 \
701 experimental(intx, MonitorUsedDeflationThreshold, 90, \
702 "Percentage of used monitors before triggering deflation (0 is " \
703 "off). The check is performed on GuaranteedSafepointInterval " \
704 "or AsyncDeflationInterval.") \
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 product(bool, ReduceSignalUsage, false, \
715 "Reduce the use of OS signals in Java and/or the VM") \
716 \
717 develop(bool, LoadLineNumberTables, true, \
718 "Tell whether the class file parser loads line number tables") \
719 \
720 develop(bool, LoadLocalVariableTables, true, \
721 "Tell whether the class file parser loads local variable tables") \
722 \
723 develop(bool, LoadLocalVariableTypeTables, true, \
724 "Tell whether the class file parser loads local variable type" \
725 "tables") \
726 \
727 product(bool, AllowUserSignalHandlers, false, \
728 "Do not complain if the application installs signal handlers " \
729 "(Unix only)") \
730 \
731 product(bool, UseSignalChaining, true, \
732 "Use signal-chaining to invoke signal handlers installed " \
733 "by the application (Unix only)") \
734 \
735 product(bool, RestoreMXCSROnJNICalls, false, \
736 "Restore MXCSR when returning from JNI calls") \
737 \
738 product(bool, CheckJNICalls, false, \
739 "Verify all arguments to JNI calls") \
740 \
741 product(bool, UseFastJNIAccessors, true, \
742 "Use optimized versions of Get<Primitive>Field") \
743 \
744 product(intx, MaxJNILocalCapacity, 65536, \
745 "Maximum allowable local JNI handle capacity to " \
746 "EnsureLocalCapacity() and PushLocalFrame(), " \
747 "where <= 0 is unlimited, default: 65536") \
748 range(min_intx, max_intx) \
749 \
750 product(bool, EagerXrunInit, false, \
751 "Eagerly initialize -Xrun libraries; allows startup profiling, " \
752 "but not all -Xrun libraries may support the state of the VM " \
753 "at this time") \
754 \
755 product(bool, PreserveAllAnnotations, false, \
756 "Preserve RuntimeInvisibleAnnotations as well " \
757 "as RuntimeVisibleAnnotations") \
758 \
759 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \
760 "Number of OutOfMemoryErrors preallocated with backtrace") \
761 \
762 product(bool, UseXMMForArrayCopy, false, \
763 "Use SSE2 MOVQ instruction for Arraycopy") \
764 \
765 notproduct(bool, PrintFieldLayout, false, \
766 "Print field layout for each class") \
767 \
768 /* Need to limit the extent of the padding to reasonable size. */\
769 /* 8K is well beyond the reasonable HW cache line size, even with */\
770 /* aggressive prefetching, while still leaving the room for segregating */\
771 /* among the distinct pages. */\
772 product(intx, ContendedPaddingWidth, 128, \
773 "How many bytes to pad the fields/classes marked @Contended with")\
774 range(0, 8192) \
775 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \
776 \
777 product(bool, EnableContended, true, \
778 "Enable @Contended annotation support") \
779 \
780 product(bool, RestrictContended, true, \
781 "Restrict @Contended to trusted classes") \
782 \
783 product(bool, UseBiasedLocking, false, \
784 "(Deprecated) Enable biased locking in JVM") \
785 \
786 product(intx, BiasedLockingStartupDelay, 0, \
787 "(Deprecated) Number of milliseconds to wait before enabling " \
788 "biased locking") \
789 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
790 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \
791 \
792 diagnostic(bool, PrintBiasedLockingStatistics, false, \
793 "(Deprecated) Print statistics of biased locking in JVM") \
794 \
795 product(intx, BiasedLockingBulkRebiasThreshold, 20, \
796 "(Deprecated) Threshold of number of revocations per type to " \
797 "try to rebias all objects in the heap of that type") \
798 range(0, max_intx) \
799 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \
800 \
801 product(intx, BiasedLockingBulkRevokeThreshold, 40, \
802 "(Deprecated) Threshold of number of revocations per type to " \
803 "permanently revoke biases of all objects in the heap of that " \
804 "type") \
805 range(0, max_intx) \
806 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \
807 \
808 product(intx, BiasedLockingDecayTime, 25000, \
809 "(Deprecated) Decay time (in milliseconds) to re-enable bulk " \
810 "rebiasing of a type after previous bulk rebias") \
811 range(500, max_intx) \
812 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \
813 \
814 product(bool, ExitOnOutOfMemoryError, false, \
815 "JVM exits on the first occurrence of an out-of-memory error") \
816 \
817 product(bool, CrashOnOutOfMemoryError, false, \
818 "JVM aborts, producing an error log and core/mini dump, on the " \
819 "first occurrence of an out-of-memory error") \
820 \
821 /* tracing */ \
822 \
823 develop(bool, StressRewriter, false, \
824 "Stress linktime bytecode rewriting") \
825 \
826 product(ccstr, TraceJVMTI, NULL, \
827 "Trace flags for JVMTI functions and events") \
828 \
829 /* This option can change an EMCP method into an obsolete method. */ \
830 /* This can affect tests that except specific methods to be EMCP. */ \
831 /* This option should be used with caution. */ \
832 product(bool, StressLdcRewrite, false, \
833 "Force ldc -> ldc_w rewrite during RedefineClasses") \
834 \
835 /* change to false by default sometime after Mustang */ \
836 product(bool, VerifyMergedCPBytecodes, true, \
837 "Verify bytecodes after RedefineClasses constant pool merging") \
838 \
839 product(bool, AllowRedefinitionToAddDeleteMethods, false, \
840 "(Deprecated) Allow redefinition to add and delete private " \
841 "static or final methods for compatibility with old releases") \
842 \
843 develop(bool, TraceBytecodes, false, \
844 "Trace bytecode execution") \
845 \
846 develop(bool, TraceICs, false, \
847 "Trace inline cache changes") \
848 \
849 notproduct(bool, TraceInvocationCounterOverflow, false, \
850 "Trace method invocation counter overflow") \
851 \
852 develop(bool, TraceInlineCacheClearing, false, \
853 "Trace clearing of inline caches in nmethods") \
854 \
855 develop(bool, TraceDependencies, false, \
856 "Trace dependencies") \
857 \
858 develop(bool, VerifyDependencies, trueInDebug, \
859 "Exercise and verify the compilation dependency mechanism") \
860 \
861 develop(bool, TraceNewOopMapGeneration, false, \
862 "Trace OopMapGeneration") \
863 \
864 develop(bool, TraceNewOopMapGenerationDetailed, false, \
865 "Trace OopMapGeneration: print detailed cell states") \
866 \
867 develop(bool, TimeOopMap, false, \
868 "Time calls to GenerateOopMap::compute_map() in sum") \
869 \
870 develop(bool, TimeOopMap2, false, \
871 "Time calls to GenerateOopMap::compute_map() individually") \
872 \
873 develop(bool, TraceOopMapRewrites, false, \
874 "Trace rewriting of methods during oop map generation") \
875 \
876 develop(bool, TraceICBuffer, false, \
877 "Trace usage of IC buffer") \
878 \
879 develop(bool, TraceCompiledIC, false, \
880 "Trace changes of compiled IC") \
881 \
882 develop(bool, FLSVerifyDictionary, false, \
883 "Do lots of (expensive) FLS dictionary verification") \
884 \
885 \
886 notproduct(bool, CheckMemoryInitialization, false, \
887 "Check memory initialization") \
888 \
889 product(uintx, ProcessDistributionStride, 4, \
890 "Stride through processors when distributing processes") \
891 range(0, max_juint) \
892 \
893 develop(bool, TraceFinalizerRegistration, false, \
894 "Trace registration of final references") \
895 \
896 product(bool, IgnoreEmptyClassPaths, false, \
897 "Ignore empty path elements in -classpath") \
898 \
899 product(size_t, InitialBootClassLoaderMetaspaceSize, \
900 NOT_LP64(2200*K) LP64_ONLY(4*M), \
901 "(Deprecated) Initial size of the boot class loader data metaspace") \
902 range(30*K, max_uintx/BytesPerWord) \
903 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
904 \
905 product(bool, PrintHeapAtSIGBREAK, true, \
906 "Print heap layout in response to SIGBREAK") \
907 \
908 manageable(bool, PrintClassHistogram, false, \
909 "Print a histogram of class instances") \
910 \
911 experimental(double, ObjectCountCutOffPercent, 0.5, \
912 "The percentage of the used heap that the instances of a class " \
913 "must occupy for the class to generate a trace event") \
914 range(0.0, 100.0) \
915 \
916 /* JVMTI heap profiling */ \
917 \
918 diagnostic(bool, TraceJVMTIObjectTagging, false, \
919 "Trace JVMTI object tagging calls") \
920 \
921 diagnostic(bool, VerifyBeforeIteration, false, \
922 "Verify memory system before JVMTI iteration") \
923 \
924 /* compiler interface */ \
925 \
926 develop(bool, CIPrintCompilerName, false, \
927 "when CIPrint is active, print the name of the active compiler") \
928 \
929 diagnostic(bool, CIPrintCompileQueue, false, \
930 "display the contents of the compile queue whenever a " \
931 "compilation is enqueued") \
932 \
933 develop(bool, CIPrintRequests, false, \
934 "display every request for compilation") \
935 \
936 product(bool, CITime, false, \
937 "collect timing information for compilation") \
938 \
939 develop(bool, CITimeVerbose, false, \
940 "be more verbose in compilation timings") \
941 \
942 develop(bool, CITimeEach, false, \
943 "display timing information after each successful compilation") \
944 \
945 develop(bool, CICountOSR, false, \
946 "use a separate counter when assigning ids to osr compilations") \
947 \
948 develop(bool, CICompileNatives, true, \
949 "compile native methods if supported by the compiler") \
950 \
951 develop_pd(bool, CICompileOSR, \
952 "compile on stack replacement methods if supported by the " \
953 "compiler") \
954 \
955 develop(bool, CIPrintMethodCodes, false, \
956 "print method bytecodes of the compiled code") \
957 \
958 develop(bool, CIPrintTypeFlow, false, \
959 "print the results of ciTypeFlow analysis") \
960 \
961 develop(bool, CITraceTypeFlow, false, \
962 "detailed per-bytecode tracing of ciTypeFlow analysis") \
963 \
964 develop(intx, OSROnlyBCI, -1, \
965 "OSR only at this bci. Negative values mean exclude that bci") \
966 \
967 /* compiler */ \
968 \
969 /* notice: the max range value here is max_jint, not max_intx */ \
970 /* because of overflow issue */ \
971 product(intx, CICompilerCount, CI_COMPILER_COUNT, \
972 "Number of compiler threads to run") \
973 range(0, max_jint) \
974 constraint(CICompilerCountConstraintFunc, AfterErgo) \
975 \
976 product(bool, UseDynamicNumberOfCompilerThreads, true, \
977 "Dynamically choose the number of parallel compiler threads") \
978 \
979 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \
980 "Reduce the number of parallel compiler threads when they " \
981 "are not used") \
982 \
983 diagnostic(bool, TraceCompilerThreads, false, \
984 "Trace creation and removal of compiler threads") \
985 \
986 develop(bool, InjectCompilerCreationFailure, false, \
987 "Inject thread creation failures for " \
988 "UseDynamicNumberOfCompilerThreads") \
989 \
990 develop(bool, UseStackBanging, true, \
991 "use stack banging for stack overflow checks (required for " \
992 "proper StackOverflow handling; disable only to measure cost " \
993 "of stackbanging)") \
994 \
995 develop(bool, GenerateSynchronizationCode, true, \
996 "generate locking/unlocking code for synchronized methods and " \
997 "monitors") \
998 \
999 develop(bool, GenerateRangeChecks, true, \
1000 "Generate range checks for array accesses") \
1001 \
1002 diagnostic_pd(bool, ImplicitNullChecks, \
1003 "Generate code for implicit null checks") \
1004 \
1005 product_pd(bool, TrapBasedNullChecks, \
1006 "Generate code for null checks that uses a cmp and trap " \
1007 "instruction raising SIGTRAP. This is only used if an access to" \
1008 "null (+offset) will not raise a SIGSEGV, i.e.," \
1009 "ImplicitNullChecks don't work (PPC64).") \
1010 \
1011 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \
1012 "Enable Thread SMR extra validity checks") \
1013 \
1014 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \
1015 "Enable Thread SMR Statistics") \
1016 \
1017 product(bool, UseNotificationThread, true, \
1018 "Use Notification Thread") \
1019 \
1020 product(bool, Inline, true, \
1021 "Enable inlining") \
1022 \
1023 product(bool, ClipInlining, true, \
1024 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \
1025 \
1026 develop(bool, UseCHA, true, \
1027 "Enable CHA") \
1028 \
1029 product(bool, UseTypeProfile, true, \
1030 "Check interpreter profile for historically monomorphic calls") \
1031 \
1032 diagnostic(bool, PrintInlining, false, \
1033 "Print inlining optimizations") \
1034 \
1035 product(bool, UsePopCountInstruction, false, \
1036 "Use population count instruction") \
1037 \
1038 develop(bool, EagerInitialization, false, \
1039 "Eagerly initialize classes if possible") \
1040 \
1041 diagnostic(bool, LogTouchedMethods, false, \
1042 "Log methods which have been ever touched in runtime") \
1043 \
1044 diagnostic(bool, PrintTouchedMethodsAtExit, false, \
1045 "Print all methods that have been ever touched in runtime") \
1046 \
1047 develop(bool, TraceMethodReplacement, false, \
1048 "Print when methods are replaced do to recompilation") \
1049 \
1050 develop(bool, PrintMethodFlushing, false, \
1051 "Print the nmethods being flushed") \
1052 \
1053 diagnostic(bool, PrintMethodFlushingStatistics, false, \
1054 "print statistics about method flushing") \
1055 \
1056 diagnostic(intx, HotMethodDetectionLimit, 100000, \
1057 "Number of compiled code invocations after which " \
1058 "the method is considered as hot by the flusher") \
1059 range(1, max_jint) \
1060 \
1061 diagnostic(intx, MinPassesBeforeFlush, 10, \
1062 "Minimum number of sweeper passes before an nmethod " \
1063 "can be flushed") \
1064 range(0, max_intx) \
1065 \
1066 product(bool, UseCodeAging, true, \
1067 "Insert counter to detect warm methods") \
1068 \
1069 diagnostic(bool, StressCodeAging, false, \
1070 "Start with counters compiled in") \
1071 \
1072 develop(bool, StressCodeBuffers, false, \
1073 "Exercise code buffer expansion and other rare state changes") \
1074 \
1075 diagnostic(bool, DebugNonSafepoints, trueInDebug, \
1076 "Generate extra debugging information for non-safepoints in " \
1077 "nmethods") \
1078 \
1079 product(bool, PrintVMOptions, false, \
1080 "Print flags that appeared on the command line") \
1081 \
1082 product(bool, IgnoreUnrecognizedVMOptions, false, \
1083 "Ignore unrecognized VM options") \
1084 \
1085 product(bool, PrintCommandLineFlags, false, \
1086 "Print flags specified on command line or set by ergonomics") \
1087 \
1088 product(bool, PrintFlagsInitial, false, \
1089 "Print all VM flags before argument processing and exit VM") \
1090 \
1091 product(bool, PrintFlagsFinal, false, \
1092 "Print all VM flags after argument and ergonomic processing") \
1093 \
1094 notproduct(bool, PrintFlagsWithComments, false, \
1095 "Print all VM flags with default values and descriptions and " \
1096 "exit") \
1097 \
1098 product(bool, PrintFlagsRanges, false, \
1099 "Print VM flags and their ranges") \
1100 \
1101 diagnostic(bool, SerializeVMOutput, true, \
1102 "Use a mutex to serialize output to tty and LogFile") \
1103 \
1104 diagnostic(bool, DisplayVMOutput, true, \
1105 "Display all VM output on the tty, independently of LogVMOutput") \
1106 \
1107 diagnostic(bool, LogVMOutput, false, \
1108 "Save VM output to LogFile") \
1109 \
1110 diagnostic(ccstr, LogFile, NULL, \
1111 "If LogVMOutput or LogCompilation is on, save VM output to " \
1112 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1113 \
1114 product(ccstr, ErrorFile, NULL, \
1115 "If an error occurs, save the error data to this file " \
1116 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \
1117 \
1118 product(bool, ExtensiveErrorReports, \
1119 PRODUCT_ONLY(false) NOT_PRODUCT(true), \
1120 "Error reports are more extensive.") \
1121 \
1122 product(bool, DisplayVMOutputToStderr, false, \
1123 "If DisplayVMOutput is true, display all VM output to stderr") \
1124 \
1125 product(bool, DisplayVMOutputToStdout, false, \
1126 "If DisplayVMOutput is true, display all VM output to stdout") \
1127 \
1128 product(bool, ErrorFileToStderr, false, \
1129 "If true, error data is printed to stderr instead of a file") \
1130 \
1131 product(bool, ErrorFileToStdout, false, \
1132 "If true, error data is printed to stdout instead of a file") \
1133 \
1134 product(bool, UseHeavyMonitors, false, \
1135 "use heavyweight instead of lightweight Java monitors") \
1136 \
1137 product(bool, PrintStringTableStatistics, false, \
1138 "print statistics about the StringTable and SymbolTable") \
1139 \
1140 diagnostic(bool, VerifyStringTableAtExit, false, \
1141 "verify StringTable contents at exit") \
1142 \
1143 notproduct(bool, PrintSymbolTableSizeHistogram, false, \
1144 "print histogram of the symbol table") \
1145 \
1146 notproduct(bool, ExitVMOnVerifyError, false, \
1147 "standard exit from VM if bytecode verify error " \
1148 "(only in debug mode)") \
1149 \
1150 diagnostic(ccstr, AbortVMOnException, NULL, \
1151 "Call fatal if this exception is thrown. Example: " \
1152 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1153 \
1154 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \
1155 "Call fatal if the exception pointed by AbortVMOnException " \
1156 "has this message") \
1157 \
1158 develop(bool, DebugVtables, false, \
1159 "add debugging code to vtable dispatch") \
1160 \
1161 notproduct(bool, PrintVtableStats, false, \
1162 "print vtables stats at end of run") \
1163 \
1164 develop(bool, TraceCreateZombies, false, \
1165 "trace creation of zombie nmethods") \
1166 \
1167 product(bool, RangeCheckElimination, true, \
1168 "Eliminate range checks") \
1169 \
1170 develop_pd(bool, UncommonNullCast, \
1171 "track occurrences of null in casts; adjust compiler tactics") \
1172 \
1173 develop(bool, TypeProfileCasts, true, \
1174 "treat casts like calls for purposes of type profiling") \
1175 \
1176 develop(bool, TraceLivenessGen, false, \
1177 "Trace the generation of liveness analysis information") \
1178 \
1179 notproduct(bool, TraceLivenessQuery, false, \
1180 "Trace queries of liveness analysis information") \
1181 \
1182 notproduct(bool, CollectIndexSetStatistics, false, \
1183 "Collect information about IndexSets") \
1184 \
1185 develop(bool, UseLoopSafepoints, true, \
1186 "Generate Safepoint nodes in every loop") \
1187 \
1188 develop(intx, FastAllocateSizeLimit, 128*K, \
1189 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \
1190 "Inline allocations larger than this in doublewords must go slow")\
1191 \
1192 product_pd(bool, CompactStrings, \
1193 "Enable Strings to use single byte chars in backing store") \
1194 \
1195 product_pd(uintx, TypeProfileLevel, \
1196 "=XYZ, with Z: Type profiling of arguments at call; " \
1197 "Y: Type profiling of return value at call; " \
1198 "X: Type profiling of parameters to methods; " \
1199 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \
1200 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \
1201 \
1202 product(intx, TypeProfileArgsLimit, 2, \
1203 "max number of call arguments to consider for type profiling") \
1204 range(0, 16) \
1205 \
1206 product(intx, TypeProfileParmsLimit, 2, \
1207 "max number of incoming parameters to consider for type profiling"\
1208 ", -1 for all") \
1209 range(-1, 64) \
1210 \
1211 /* statistics */ \
1212 develop(bool, CountCompiledCalls, false, \
1213 "Count method invocations") \
1214 \
1215 notproduct(bool, CountRuntimeCalls, false, \
1216 "Count VM runtime calls") \
1217 \
1218 develop(bool, CountJNICalls, false, \
1219 "Count jni method invocations") \
1220 \
1221 notproduct(bool, CountJVMCalls, false, \
1222 "Count jvm method invocations") \
1223 \
1224 notproduct(bool, CountRemovableExceptions, false, \
1225 "Count exceptions that could be replaced by branches due to " \
1226 "inlining") \
1227 \
1228 notproduct(bool, ICMissHistogram, false, \
1229 "Produce histogram of IC misses") \
1230 \
1231 /* interpreter */ \
1232 product_pd(bool, RewriteBytecodes, \
1233 "Allow rewriting of bytecodes (bytecodes are not immutable)") \
1234 \
1235 product_pd(bool, RewriteFrequentPairs, \
1236 "Rewrite frequently used bytecode pairs into a single bytecode") \
1237 \
1238 diagnostic(bool, PrintInterpreter, false, \
1239 "Print the generated interpreter code") \
1240 \
1241 product(bool, UseInterpreter, true, \
1242 "Use interpreter for non-compiled methods") \
1243 \
1244 develop(bool, UseFastSignatureHandlers, true, \
1245 "Use fast signature handlers for native calls") \
1246 \
1247 product(bool, UseLoopCounter, true, \
1248 "Increment invocation counter on backward branch") \
1249 \
1250 product_pd(bool, UseOnStackReplacement, \
1251 "Use on stack replacement, calls runtime if invoc. counter " \
1252 "overflows in loop") \
1253 \
1254 notproduct(bool, TraceOnStackReplacement, false, \
1255 "Trace on stack replacement") \
1256 \
1257 product_pd(bool, PreferInterpreterNativeStubs, \
1258 "Use always interpreter stubs for native methods invoked via " \
1259 "interpreter") \
1260 \
1261 develop(bool, CountBytecodes, false, \
1262 "Count number of bytecodes executed") \
1263 \
1264 develop(bool, PrintBytecodeHistogram, false, \
1265 "Print histogram of the executed bytecodes") \
1266 \
1267 develop(bool, PrintBytecodePairHistogram, false, \
1268 "Print histogram of the executed bytecode pairs") \
1269 \
1270 diagnostic(bool, PrintSignatureHandlers, false, \
1271 "Print code generated for native method signature handlers") \
1272 \
1273 develop(bool, VerifyOops, false, \
1274 "Do plausibility checks for oops") \
1275 \
1276 develop(bool, CheckUnhandledOops, false, \
1277 "Check for unhandled oops in VM code") \
1278 \
1279 develop(bool, VerifyJNIFields, trueInDebug, \
1280 "Verify jfieldIDs for instance fields") \
1281 \
1282 notproduct(bool, VerifyJNIEnvThread, false, \
1283 "Verify JNIEnv.thread == Thread::current() when entering VM " \
1284 "from JNI") \
1285 \
1286 develop(bool, VerifyFPU, false, \
1287 "Verify FPU state (check for NaN's, etc.)") \
1288 \
1289 develop(bool, VerifyThread, false, \
1290 "Watch the thread register for corruption (SPARC only)") \
1291 \
1292 develop(bool, VerifyActivationFrameSize, false, \
1293 "Verify that activation frame didn't become smaller than its " \
1294 "minimal size") \
1295 \
1296 develop(bool, TraceFrequencyInlining, false, \
1297 "Trace frequency based inlining") \
1298 \
1299 develop_pd(bool, InlineIntrinsics, \
1300 "Inline intrinsics that can be statically resolved") \
1301 \
1302 product_pd(bool, ProfileInterpreter, \
1303 "Profile at the bytecode level during interpretation") \
1304 \
1305 develop(bool, TraceProfileInterpreter, false, \
1306 "Trace profiling at the bytecode level during interpretation. " \
1307 "This outputs the profiling information collected to improve " \
1308 "jit compilation.") \
1309 \
1310 develop_pd(bool, ProfileTraps, \
1311 "Profile deoptimization traps at the bytecode level") \
1312 \
1313 product(intx, ProfileMaturityPercentage, 20, \
1314 "number of method invocations/branches (expressed as % of " \
1315 "CompileThreshold) before using the method's profile") \
1316 range(0, 100) \
1317 \
1318 diagnostic(bool, PrintMethodData, false, \
1319 "Print the results of +ProfileInterpreter at end of run") \
1320 \
1321 develop(bool, VerifyDataPointer, trueInDebug, \
1322 "Verify the method data pointer during interpreter profiling") \
1323 \
1324 develop(bool, VerifyCompiledCode, false, \
1325 "Include miscellaneous runtime verifications in nmethod code; " \
1326 "default off because it disturbs nmethod size heuristics") \
1327 \
1328 notproduct(bool, CrashGCForDumpingJavaThread, false, \
1329 "Manually make GC thread crash then dump java stack trace; " \
1330 "Test only") \
1331 \
1332 /* compilation */ \
1333 product(bool, UseCompiler, true, \
1334 "Use Just-In-Time compilation") \
1335 \
1336 product(bool, UseCounterDecay, true, \
1337 "Adjust recompilation counters") \
1338 \
1339 develop(intx, CounterHalfLifeTime, 30, \
1340 "Half-life time of invocation counters (in seconds)") \
1341 \
1342 develop(intx, CounterDecayMinIntervalLength, 500, \
1343 "The minimum interval (in milliseconds) between invocation of " \
1344 "CounterDecay") \
1345 \
1346 product(bool, AlwaysCompileLoopMethods, false, \
1347 "When using recompilation, never interpret methods " \
1348 "containing loops") \
1349 \
1350 product(bool, DontCompileHugeMethods, true, \
1351 "Do not compile methods > HugeMethodLimit") \
1352 \
1353 /* Bytecode escape analysis estimation. */ \
1354 product(bool, EstimateArgEscape, true, \
1355 "Analyze bytecodes to estimate escape state of arguments") \
1356 \
1357 product(intx, BCEATraceLevel, 0, \
1358 "How much tracing to do of bytecode escape analysis estimates " \
1359 "(0-3)") \
1360 range(0, 3) \
1361 \
1362 product(intx, MaxBCEAEstimateLevel, 5, \
1363 "Maximum number of nested calls that are analyzed by BC EA") \
1364 range(0, max_jint) \
1365 \
1366 product(intx, MaxBCEAEstimateSize, 150, \
1367 "Maximum bytecode size of a method to be analyzed by BC EA") \
1368 range(0, max_jint) \
1369 \
1370 product(intx, AllocatePrefetchStyle, 1, \
1371 "0 = no prefetch, " \
1372 "1 = generate prefetch instructions for each allocation, " \
1373 "2 = use TLAB watermark to gate allocation prefetch, " \
1374 "3 = generate one prefetch instruction per cache line") \
1375 range(0, 3) \
1376 \
1377 product(intx, AllocatePrefetchDistance, -1, \
1378 "Distance to prefetch ahead of allocation pointer. " \
1379 "-1: use system-specific value (automatically determined") \
1380 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\
1381 \
1382 product(intx, AllocatePrefetchLines, 3, \
1383 "Number of lines to prefetch ahead of array allocation pointer") \
1384 range(1, 64) \
1385 \
1386 product(intx, AllocateInstancePrefetchLines, 1, \
1387 "Number of lines to prefetch ahead of instance allocation " \
1388 "pointer") \
1389 range(1, 64) \
1390 \
1391 product(intx, AllocatePrefetchStepSize, 16, \
1392 "Step size in bytes of sequential prefetch instructions") \
1393 range(1, 512) \
1394 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1395 \
1396 product(intx, AllocatePrefetchInstr, 0, \
1397 "Select instruction to prefetch ahead of allocation pointer") \
1398 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \
1399 \
1400 /* deoptimization */ \
1401 develop(bool, TraceDeoptimization, false, \
1402 "Trace deoptimization") \
1403 \
1404 develop(bool, PrintDeoptimizationDetails, false, \
1405 "Print more information about deoptimization") \
1406 \
1407 develop(bool, DebugDeoptimization, false, \
1408 "Tracing various information while debugging deoptimization") \
1409 \
1410 product(intx, SelfDestructTimer, 0, \
1411 "Will cause VM to terminate after a given time (in minutes) " \
1412 "(0 means off)") \
1413 range(0, max_intx) \
1414 \
1415 product(intx, MaxJavaStackTraceDepth, 1024, \
1416 "The maximum number of lines in the stack trace for Java " \
1417 "exceptions (0 means all)") \
1418 range(0, max_jint/2) \
1419 \
1420 /* notice: the max range value here is max_jint, not max_intx */ \
1421 /* because of overflow issue */ \
1422 diagnostic(intx, GuaranteedSafepointInterval, 1000, \
1423 "Guarantee a safepoint (at least) every so many milliseconds " \
1424 "(0 means none)") \
1425 range(0, max_jint) \
1426 \
1427 product(intx, SafepointTimeoutDelay, 10000, \
1428 "Delay in milliseconds for option SafepointTimeout") \
1429 LP64_ONLY(range(0, max_intx/MICROUNITS)) \
1430 NOT_LP64(range(0, max_intx)) \
1431 \
1432 product(intx, NmethodSweepActivity, 10, \
1433 "Removes cold nmethods from code cache if > 0. Higher values " \
1434 "result in more aggressive sweeping") \
1435 range(0, 2000) \
1436 \
1437 notproduct(bool, LogSweeper, false, \
1438 "Keep a ring buffer of sweeper activity") \
1439 \
1440 notproduct(intx, SweeperLogEntries, 1024, \
1441 "Number of records in the ring buffer of sweeper activity") \
1442 \
1443 notproduct(intx, MemProfilingInterval, 500, \
1444 "Time between each invocation of the MemProfiler") \
1445 \
1446 develop(intx, MallocCatchPtr, -1, \
1447 "Hit breakpoint when mallocing/freeing this pointer") \
1448 \
1449 notproduct(ccstrlist, SuppressErrorAt, "", \
1450 "List of assertions (file:line) to muzzle") \
1451 \
1452 develop(intx, StackPrintLimit, 100, \
1453 "number of stack frames to print in VM-level stack dump") \
1454 \
1455 notproduct(intx, MaxElementPrintSize, 256, \
1456 "maximum number of elements to print") \
1457 \
1458 notproduct(intx, MaxSubklassPrintSize, 4, \
1459 "maximum number of subklasses to print when printing klass") \
1460 \
1461 develop(intx, MaxForceInlineLevel, 100, \
1462 "maximum number of nested calls that are forced for inlining " \
1463 "(using CompileCommand or marked w/ @ForceInline)") \
1464 range(0, max_jint) \
1465 \
1466 product(intx, MinInliningThreshold, 250, \
1467 "The minimum invocation count a method needs to have to be " \
1468 "inlined") \
1469 range(0, max_jint) \
1470 \
1471 develop(intx, MethodHistogramCutoff, 100, \
1472 "The cutoff value for method invocation histogram (+CountCalls)") \
1473 \
1474 develop(intx, DontYieldALotInterval, 10, \
1475 "Interval between which yields will be dropped (milliseconds)") \
1476 \
1477 notproduct(intx, DeoptimizeALotInterval, 5, \
1478 "Number of exits until DeoptimizeALot kicks in") \
1479 \
1480 notproduct(intx, ZombieALotInterval, 5, \
1481 "Number of exits until ZombieALot kicks in") \
1482 \
1483 diagnostic(uintx, MallocMaxTestWords, 0, \
1484 "If non-zero, maximum number of words that malloc/realloc can " \
1485 "allocate (for testing only)") \
1486 range(0, max_uintx) \
1487 \
1488 product(intx, TypeProfileWidth, 2, \
1489 "Number of receiver types to record in call/cast profile") \
1490 range(0, 8) \
1491 \
1492 develop(intx, BciProfileWidth, 2, \
1493 "Number of return bci's to record in ret profile") \
1494 \
1495 product(intx, PerMethodRecompilationCutoff, 400, \
1496 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1497 range(-1, max_intx) \
1498 \
1499 product(intx, PerBytecodeRecompilationCutoff, 200, \
1500 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \
1501 range(-1, max_intx) \
1502 \
1503 product(intx, PerMethodTrapLimit, 100, \
1504 "Limit on traps (of one kind) in a method (includes inlines)") \
1505 range(0, max_jint) \
1506 \
1507 experimental(intx, PerMethodSpecTrapLimit, 5000, \
1508 "Limit on speculative traps (of one kind) in a method " \
1509 "(includes inlines)") \
1510 range(0, max_jint) \
1511 \
1512 product(intx, PerBytecodeTrapLimit, 4, \
1513 "Limit on traps (of one kind) at a particular BCI") \
1514 range(0, max_jint) \
1515 \
1516 experimental(intx, SpecTrapLimitExtraEntries, 3, \
1517 "Extra method data trap entries for speculation") \
1518 \
1519 develop(intx, InlineFrequencyRatio, 20, \
1520 "Ratio of call site execution to caller method invocation") \
1521 range(0, max_jint) \
1522 \
1523 diagnostic_pd(intx, InlineFrequencyCount, \
1524 "Count of call site execution necessary to trigger frequent " \
1525 "inlining") \
1526 range(0, max_jint) \
1527 \
1528 develop(intx, InlineThrowCount, 50, \
1529 "Force inlining of interpreted methods that throw this often") \
1530 range(0, max_jint) \
1531 \
1532 develop(intx, InlineThrowMaxSize, 200, \
1533 "Force inlining of throwing methods smaller than this") \
1534 range(0, max_jint) \
1535 \
1536 develop(intx, ProfilerNodeSize, 1024, \
1537 "Size in K to allocate for the Profile Nodes of each thread") \
1538 range(0, 1024) \
1539 \
1540 product_pd(size_t, MetaspaceSize, \
1541 "Initial threshold (in bytes) at which a garbage collection " \
1542 "is done to reduce Metaspace usage") \
1543 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \
1544 \
1545 product(size_t, MaxMetaspaceSize, max_uintx, \
1546 "Maximum size of Metaspaces (in bytes)") \
1547 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \
1548 \
1549 product(size_t, CompressedClassSpaceSize, 1*G, \
1550 "Maximum size of class area in Metaspace when compressed " \
1551 "class pointers are used") \
1552 range(1*M, 3*G) \
1553 \
1554 manageable(uintx, MinHeapFreeRatio, 40, \
1555 "The minimum percentage of heap free after GC to avoid expansion."\
1556 " For most GCs this applies to the old generation. In G1 and" \
1557 " ParallelGC it applies to the whole heap.") \
1558 range(0, 100) \
1559 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \
1560 \
1561 manageable(uintx, MaxHeapFreeRatio, 70, \
1562 "The maximum percentage of heap free after GC to avoid shrinking."\
1563 " For most GCs this applies to the old generation. In G1 and" \
1564 " ParallelGC it applies to the whole heap.") \
1565 range(0, 100) \
1566 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \
1567 \
1568 product(bool, ShrinkHeapInSteps, true, \
1569 "When disabled, informs the GC to shrink the java heap directly" \
1570 " to the target size at the next full GC rather than requiring" \
1571 " smaller steps during multiple full GCs.") \
1572 \
1573 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \
1574 "Number of milliseconds per MB of free space in the heap") \
1575 range(0, max_intx) \
1576 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1577 \
1578 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \
1579 "The minimum change in heap space due to GC (in bytes)") \
1580 range(0, max_uintx) \
1581 \
1582 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \
1583 "The minimum expansion of Metaspace (in bytes)") \
1584 range(0, max_uintx) \
1585 \
1586 product(uintx, MaxMetaspaceFreeRatio, 70, \
1587 "The maximum percentage of Metaspace free after GC to avoid " \
1588 "shrinking") \
1589 range(0, 100) \
1590 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \
1591 \
1592 product(uintx, MinMetaspaceFreeRatio, 40, \
1593 "The minimum percentage of Metaspace free after GC to avoid " \
1594 "expansion") \
1595 range(0, 99) \
1596 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \
1597 \
1598 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \
1599 "The maximum expansion of Metaspace without full GC (in bytes)") \
1600 range(0, max_uintx) \
1601 \
1602 /* stack parameters */ \
1603 product_pd(intx, StackYellowPages, \
1604 "Number of yellow zone (recoverable overflows) pages of size " \
1605 "4KB. If pages are bigger yellow zone is aligned up.") \
1606 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \
1607 \
1608 product_pd(intx, StackRedPages, \
1609 "Number of red zone (unrecoverable overflows) pages of size " \
1610 "4KB. If pages are bigger red zone is aligned up.") \
1611 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \
1612 \
1613 product_pd(intx, StackReservedPages, \
1614 "Number of reserved zone (reserved to annotated methods) pages" \
1615 " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1616 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1617 \
1618 product(bool, RestrictReservedStack, true, \
1619 "Restrict @ReservedStackAccess to trusted classes") \
1620 \
1621 /* greater stack shadow pages can't generate instruction to bang stack */ \
1622 product_pd(intx, StackShadowPages, \
1623 "Number of shadow zone (for overflow checking) pages of size " \
1624 "4KB. If pages are bigger shadow zone is aligned up. " \
1625 "This should exceed the depth of the VM and native call stack.") \
1626 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \
1627 \
1628 product_pd(intx, ThreadStackSize, \
1629 "Thread Stack Size (in Kbytes)") \
1630 range(0, 1 * M) \
1631 \
1632 product_pd(intx, VMThreadStackSize, \
1633 "Non-Java Thread Stack Size (in Kbytes)") \
1634 range(0, max_intx/(1 * K)) \
1635 \
1636 product_pd(intx, CompilerThreadStackSize, \
1637 "Compiler Thread Stack Size (in Kbytes)") \
1638 range(0, max_intx/(1 * K)) \
1639 \
1640 develop_pd(size_t, JVMInvokeMethodSlack, \
1641 "Stack space (bytes) required for JVM_InvokeMethod to complete") \
1642 \
1643 /* code cache parameters */ \
1644 develop_pd(uintx, CodeCacheSegmentSize, \
1645 "Code cache segment size (in bytes) - smallest unit of " \
1646 "allocation") \
1647 range(1, 1024) \
1648 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \
1649 \
1650 develop_pd(intx, CodeEntryAlignment, \
1651 "Code entry alignment for generated code (in bytes)") \
1652 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \
1653 \
1654 product_pd(intx, OptoLoopAlignment, \
1655 "Align inner loops to zero relative to this modulus") \
1656 range(1, 16) \
1657 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \
1658 \
1659 product_pd(uintx, InitialCodeCacheSize, \
1660 "Initial code cache size (in bytes)") \
1661 range(os::vm_page_size(), max_uintx) \
1662 \
1663 develop_pd(uintx, CodeCacheMinimumUseSpace, \
1664 "Minimum code cache size (in bytes) required to start VM.") \
1665 range(0, max_uintx) \
1666 \
1667 product(bool, SegmentedCodeCache, false, \
1668 "Use a segmented code cache") \
1669 \
1670 product_pd(uintx, ReservedCodeCacheSize, \
1671 "Reserved code cache size (in bytes) - maximum code cache size") \
1672 range(os::vm_page_size(), max_uintx) \
1673 \
1674 product_pd(uintx, NonProfiledCodeHeapSize, \
1675 "Size of code heap with non-profiled methods (in bytes)") \
1676 range(0, max_uintx) \
1677 \
1678 product_pd(uintx, ProfiledCodeHeapSize, \
1679 "Size of code heap with profiled methods (in bytes)") \
1680 range(0, max_uintx) \
1681 \
1682 product_pd(uintx, NonNMethodCodeHeapSize, \
1683 "Size of code heap with non-nmethods (in bytes)") \
1684 range(os::vm_page_size(), max_uintx) \
1685 \
1686 product_pd(uintx, CodeCacheExpansionSize, \
1687 "Code cache expansion size (in bytes)") \
1688 range(32*K, max_uintx) \
1689 \
1690 diagnostic_pd(uintx, CodeCacheMinBlockLength, \
1691 "Minimum number of segments in a code cache block") \
1692 range(1, 100) \
1693 \
1694 notproduct(bool, ExitOnFullCodeCache, false, \
1695 "Exit the VM if we fill the code cache") \
1696 \
1697 product(bool, UseCodeCacheFlushing, true, \
1698 "Remove cold/old nmethods from the code cache") \
1699 \
1700 product(double, SweeperThreshold, 0.5, \
1701 "Threshold controlling when code cache sweeper is invoked." \
1702 "Value is percentage of ReservedCodeCacheSize.") \
1703 range(0.0, 100.0) \
1704 \
1705 product(uintx, StartAggressiveSweepingAt, 10, \
1706 "Start aggressive sweeping if X[%] of the code cache is free." \
1707 "Segmented code cache: X[%] of the non-profiled heap." \
1708 "Non-segmented code cache: X[%] of the total code cache") \
1709 range(0, 100) \
1710 \
1711 /* AOT parameters */ \
1712 experimental(bool, UseAOT, false, \
1713 "Use AOT compiled files") \
1714 \
1715 experimental(ccstrlist, AOTLibrary, NULL, \
1716 "AOT library") \
1717 \
1718 experimental(bool, PrintAOT, false, \
1719 "Print used AOT klasses and methods") \
1720 \
1721 notproduct(bool, PrintAOTStatistics, false, \
1722 "Print AOT statistics") \
1723 \
1724 diagnostic(bool, UseAOTStrictLoading, false, \
1725 "Exit the VM if any of the AOT libraries has invalid config") \
1726 \
1727 product(bool, CalculateClassFingerprint, false, \
1728 "Calculate class fingerprint") \
1729 \
1730 /* interpreter debugging */ \
1731 develop(intx, BinarySwitchThreshold, 5, \
1732 "Minimal number of lookupswitch entries for rewriting to binary " \
1733 "switch") \
1734 \
1735 develop(intx, StopInterpreterAt, 0, \
1736 "Stop interpreter execution at specified bytecode number") \
1737 \
1738 develop(intx, TraceBytecodesAt, 0, \
1739 "Trace bytecodes starting with specified bytecode number") \
1740 \
1741 /* compiler interface */ \
1742 develop(intx, CIStart, 0, \
1743 "The id of the first compilation to permit") \
1744 \
1745 develop(intx, CIStop, max_jint, \
1746 "The id of the last compilation to permit") \
1747 \
1748 develop(intx, CIStartOSR, 0, \
1749 "The id of the first osr compilation to permit " \
1750 "(CICountOSR must be on)") \
1751 \
1752 develop(intx, CIStopOSR, max_jint, \
1753 "The id of the last osr compilation to permit " \
1754 "(CICountOSR must be on)") \
1755 \
1756 develop(intx, CIBreakAtOSR, -1, \
1757 "The id of osr compilation to break at") \
1758 \
1759 develop(intx, CIBreakAt, -1, \
1760 "The id of compilation to break at") \
1761 \
1762 product(ccstrlist, CompileOnly, "", \
1763 "List of methods (pkg/class.name) to restrict compilation to") \
1764 \
1765 product(ccstr, CompileCommandFile, NULL, \
1766 "Read compiler commands from this file [.hotspot_compiler]") \
1767 \
1768 diagnostic(ccstr, CompilerDirectivesFile, NULL, \
1769 "Read compiler directives from this file") \
1770 \
1771 product(ccstrlist, CompileCommand, "", \
1772 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
1773 \
1774 develop(bool, ReplayCompiles, false, \
1775 "Enable replay of compilations from ReplayDataFile") \
1776 \
1777 product(ccstr, ReplayDataFile, NULL, \
1778 "File containing compilation replay information" \
1779 "[default: ./replay_pid%p.log] (%p replaced with pid)") \
1780 \
1781 product(ccstr, InlineDataFile, NULL, \
1782 "File containing inlining replay information" \
1783 "[default: ./inline_pid%p.log] (%p replaced with pid)") \
1784 \
1785 develop(intx, ReplaySuppressInitializers, 2, \
1786 "Control handling of class initialization during replay: " \
1787 "0 - don't do anything special; " \
1788 "1 - treat all class initializers as empty; " \
1789 "2 - treat class initializers for application classes as empty; " \
1790 "3 - allow all class initializers to run during bootstrap but " \
1791 " pretend they are empty after starting replay") \
1792 range(0, 3) \
1793 \
1794 develop(bool, ReplayIgnoreInitErrors, false, \
1795 "Ignore exceptions thrown during initialization for replay") \
1796 \
1797 product(bool, DumpReplayDataOnError, true, \
1798 "Record replay data for crashing compiler threads") \
1799 \
1800 product(bool, CICompilerCountPerCPU, false, \
1801 "1 compiler thread for log(N CPUs)") \
1802 \
1803 notproduct(intx, CICrashAt, -1, \
1804 "id of compilation to trigger assert in compiler thread for " \
1805 "the purpose of testing, e.g. generation of replay data") \
1806 notproduct(bool, CIObjectFactoryVerify, false, \
1807 "enable potentially expensive verification in ciObjectFactory") \
1808 \
1809 diagnostic(bool, AbortVMOnCompilationFailure, false, \
1810 "Abort VM when method had failed to compile.") \
1811 \
1812 /* Priorities */ \
1813 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \
1814 \
1815 product(intx, ThreadPriorityPolicy, 0, \
1816 "0 : Normal. "\
1817 " VM chooses priorities that are appropriate for normal "\
1818 " applications. "\
1819 " On Windows applications are allowed to use higher native "\
1820 " priorities. However, with ThreadPriorityPolicy=0, VM will "\
1821 " not use the highest possible native priority, "\
1822 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\
1823 " system threads. On Linux thread priorities are ignored "\
1824 " because the OS does not support static priority in "\
1825 " SCHED_OTHER scheduling class which is the only choice for "\
1826 " non-root, non-realtime applications. "\
1827 "1 : Aggressive. "\
1828 " Java thread priorities map over to the entire range of "\
1829 " native thread priorities. Higher Java thread priorities map "\
1830 " to higher native thread priorities. This policy should be "\
1831 " used with care, as sometimes it can cause performance "\
1832 " degradation in the application and/or the entire system. On "\
1833 " Linux/BSD/macOS this policy requires root privilege or an "\
1834 " extended capability.") \
1835 range(0, 1) \
1836 \
1837 product(bool, ThreadPriorityVerbose, false, \
1838 "Print priority changes") \
1839 \
1840 product(intx, CompilerThreadPriority, -1, \
1841 "The native priority at which compiler threads should run " \
1842 "(-1 means no change)") \
1843 range(min_jint, max_jint) \
1844 \
1845 product(intx, VMThreadPriority, -1, \
1846 "The native priority at which the VM thread should run " \
1847 "(-1 means no change)") \
1848 range(-1, 127) \
1849 \
1850 product(intx, JavaPriority1_To_OSPriority, -1, \
1851 "Map Java priorities to OS priorities") \
1852 range(-1, 127) \
1853 \
1854 product(intx, JavaPriority2_To_OSPriority, -1, \
1855 "Map Java priorities to OS priorities") \
1856 range(-1, 127) \
1857 \
1858 product(intx, JavaPriority3_To_OSPriority, -1, \
1859 "Map Java priorities to OS priorities") \
1860 range(-1, 127) \
1861 \
1862 product(intx, JavaPriority4_To_OSPriority, -1, \
1863 "Map Java priorities to OS priorities") \
1864 range(-1, 127) \
1865 \
1866 product(intx, JavaPriority5_To_OSPriority, -1, \
1867 "Map Java priorities to OS priorities") \
1868 range(-1, 127) \
1869 \
1870 product(intx, JavaPriority6_To_OSPriority, -1, \
1871 "Map Java priorities to OS priorities") \
1872 range(-1, 127) \
1873 \
1874 product(intx, JavaPriority7_To_OSPriority, -1, \
1875 "Map Java priorities to OS priorities") \
1876 range(-1, 127) \
1877 \
1878 product(intx, JavaPriority8_To_OSPriority, -1, \
1879 "Map Java priorities to OS priorities") \
1880 range(-1, 127) \
1881 \
1882 product(intx, JavaPriority9_To_OSPriority, -1, \
1883 "Map Java priorities to OS priorities") \
1884 range(-1, 127) \
1885 \
1886 product(intx, JavaPriority10_To_OSPriority,-1, \
1887 "Map Java priorities to OS priorities") \
1888 range(-1, 127) \
1889 \
1890 experimental(bool, UseCriticalJavaThreadPriority, false, \
1891 "Java thread priority 10 maps to critical scheduling priority") \
1892 \
1893 experimental(bool, UseCriticalCompilerThreadPriority, false, \
1894 "Compiler thread(s) run at critical scheduling priority") \
1895 \
1896 develop(intx, NewCodeParameter, 0, \
1897 "Testing Only: Create a dedicated integer parameter before " \
1898 "putback") \
1899 \
1900 /* new oopmap storage allocation */ \
1901 develop(intx, MinOopMapAllocation, 8, \
1902 "Minimum number of OopMap entries in an OopMapSet") \
1903 \
1904 /* Background Compilation */ \
1905 develop(intx, LongCompileThreshold, 50, \
1906 "Used with +TraceLongCompiles") \
1907 \
1908 /* recompilation */ \
1909 product_pd(intx, CompileThreshold, \
1910 "number of interpreted method invocations before (re-)compiling") \
1911 constraint(CompileThresholdConstraintFunc, AfterErgo) \
1912 \
1913 product(double, CompileThresholdScaling, 1.0, \
1914 "Factor to control when first compilation happens " \
1915 "(both with and without tiered compilation): " \
1916 "values greater than 1.0 delay counter overflow, " \
1917 "values between 0 and 1.0 rush counter overflow, " \
1918 "value of 1.0 leaves compilation thresholds unchanged " \
1919 "value of 0.0 is equivalent to -Xint. " \
1920 "" \
1921 "Flag can be set as per-method option. " \
1922 "If a value is specified for a method, compilation thresholds " \
1923 "for that method are scaled by both the value of the global flag "\
1924 "and the value of the per-method flag.") \
1925 range(0.0, DBL_MAX) \
1926 \
1927 product(intx, Tier0InvokeNotifyFreqLog, 7, \
1928 "Interpreter (tier 0) invocation notification frequency") \
1929 range(0, 30) \
1930 \
1931 product(intx, Tier2InvokeNotifyFreqLog, 11, \
1932 "C1 without MDO (tier 2) invocation notification frequency") \
1933 range(0, 30) \
1934 \
1935 product(intx, Tier3InvokeNotifyFreqLog, 10, \
1936 "C1 with MDO profiling (tier 3) invocation notification " \
1937 "frequency") \
1938 range(0, 30) \
1939 \
1940 product(intx, Tier23InlineeNotifyFreqLog, 20, \
1941 "Inlinee invocation (tiers 2 and 3) notification frequency") \
1942 range(0, 30) \
1943 \
1944 product(intx, Tier0BackedgeNotifyFreqLog, 10, \
1945 "Interpreter (tier 0) invocation notification frequency") \
1946 range(0, 30) \
1947 \
1948 product(intx, Tier2BackedgeNotifyFreqLog, 14, \
1949 "C1 without MDO (tier 2) invocation notification frequency") \
1950 range(0, 30) \
1951 \
1952 product(intx, Tier3BackedgeNotifyFreqLog, 13, \
1953 "C1 with MDO profiling (tier 3) invocation notification " \
1954 "frequency") \
1955 range(0, 30) \
1956 \
1957 product(intx, Tier2CompileThreshold, 0, \
1958 "threshold at which tier 2 compilation is invoked") \
1959 range(0, max_jint) \
1960 \
1961 product(intx, Tier2BackEdgeThreshold, 0, \
1962 "Back edge threshold at which tier 2 compilation is invoked") \
1963 range(0, max_jint) \
1964 \
1965 product(intx, Tier3InvocationThreshold, 200, \
1966 "Compile if number of method invocations crosses this " \
1967 "threshold") \
1968 range(0, max_jint) \
1969 \
1970 product(intx, Tier3MinInvocationThreshold, 100, \
1971 "Minimum invocation to compile at tier 3") \
1972 range(0, max_jint) \
1973 \
1974 product(intx, Tier3CompileThreshold, 2000, \
1975 "Threshold at which tier 3 compilation is invoked (invocation " \
1976 "minimum must be satisfied)") \
1977 range(0, max_jint) \
1978 \
1979 product(intx, Tier3BackEdgeThreshold, 60000, \
1980 "Back edge threshold at which tier 3 OSR compilation is invoked") \
1981 range(0, max_jint) \
1982 \
1983 product(intx, Tier3AOTInvocationThreshold, 10000, \
1984 "Compile if number of method invocations crosses this " \
1985 "threshold if coming from AOT") \
1986 range(0, max_jint) \
1987 \
1988 product(intx, Tier3AOTMinInvocationThreshold, 1000, \
1989 "Minimum invocation to compile at tier 3 if coming from AOT") \
1990 range(0, max_jint) \
1991 \
1992 product(intx, Tier3AOTCompileThreshold, 15000, \
1993 "Threshold at which tier 3 compilation is invoked (invocation " \
1994 "minimum must be satisfied) if coming from AOT") \
1995 range(0, max_jint) \
1996 \
1997 product(intx, Tier3AOTBackEdgeThreshold, 120000, \
1998 "Back edge threshold at which tier 3 OSR compilation is invoked " \
1999 "if coming from AOT") \
2000 range(0, max_jint) \
2001 \
2002 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \
2003 "Switch to interpreter to profile if the number of method " \
2004 "invocations crosses this threshold if coming from AOT " \
2005 "(applicable only with " \
2006 "CompilationMode=high-only|high-only-quick-internal)") \
2007 range(0, max_jint) \
2008 \
2009 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \
2010 "Minimum number of invocations to switch to interpreter " \
2011 "to profile if coming from AOT " \
2012 "(applicable only with " \
2013 "CompilationMode=high-only|high-only-quick-internal)") \
2014 range(0, max_jint) \
2015 \
2016 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \
2017 "Threshold at which to switch to interpreter to profile " \
2018 "if coming from AOT " \
2019 "(invocation minimum must be satisfied, " \
2020 "applicable only with " \
2021 "CompilationMode=high-only|high-only-quick-internal)") \
2022 range(0, max_jint) \
2023 \
2024 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \
2025 "Back edge threshold at which to switch to interpreter " \
2026 "to profile if coming from AOT " \
2027 "(applicable only with " \
2028 "CompilationMode=high-only|high-only-quick-internal)") \
2029 range(0, max_jint) \
2030 \
2031 product(intx, Tier4InvocationThreshold, 5000, \
2032 "Compile if number of method invocations crosses this " \
2033 "threshold") \
2034 range(0, max_jint) \
2035 \
2036 product(intx, Tier4MinInvocationThreshold, 600, \
2037 "Minimum invocation to compile at tier 4") \
2038 range(0, max_jint) \
2039 \
2040 product(intx, Tier4CompileThreshold, 15000, \
2041 "Threshold at which tier 4 compilation is invoked (invocation " \
2042 "minimum must be satisfied)") \
2043 range(0, max_jint) \
2044 \
2045 product(intx, Tier4BackEdgeThreshold, 40000, \
2046 "Back edge threshold at which tier 4 OSR compilation is invoked") \
2047 range(0, max_jint) \
2048 \
2049 diagnostic(intx, Tier40InvocationThreshold, 5000, \
2050 "Compile if number of method invocations crosses this " \
2051 "threshold (applicable only with " \
2052 "CompilationMode=high-only|high-only-quick-internal)") \
2053 range(0, max_jint) \
2054 \
2055 diagnostic(intx, Tier40MinInvocationThreshold, 600, \
2056 "Minimum number of invocations to compile at tier 4 " \
2057 "(applicable only with " \
2058 "CompilationMode=high-only|high-only-quick-internal)") \
2059 range(0, max_jint) \
2060 \
2061 diagnostic(intx, Tier40CompileThreshold, 10000, \
2062 "Threshold at which tier 4 compilation is invoked (invocation " \
2063 "minimum must be satisfied, applicable only with " \
2064 "CompilationMode=high-only|high-only-quick-internal)") \
2065 range(0, max_jint) \
2066 \
2067 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \
2068 "Back edge threshold at which tier 4 OSR compilation is invoked " \
2069 "(applicable only with " \
2070 "CompilationMode=high-only|high-only-quick-internal)") \
2071 range(0, max_jint) \
2072 \
2073 diagnostic(intx, Tier0Delay, 5, \
2074 "If C2 queue size grows over this amount per compiler thread " \
2075 "do not start profiling in the interpreter " \
2076 "(applicable only with " \
2077 "CompilationMode=high-only|high-only-quick-internal)") \
2078 range(0, max_jint) \
2079 \
2080 product(intx, Tier3DelayOn, 5, \
2081 "If C2 queue size grows over this amount per compiler thread " \
2082 "stop compiling at tier 3 and start compiling at tier 2") \
2083 range(0, max_jint) \
2084 \
2085 product(intx, Tier3DelayOff, 2, \
2086 "If C2 queue size is less than this amount per compiler thread " \
2087 "allow methods compiled at tier 2 transition to tier 3") \
2088 range(0, max_jint) \
2089 \
2090 product(intx, Tier3LoadFeedback, 5, \
2091 "Tier 3 thresholds will increase twofold when C1 queue size " \
2092 "reaches this amount per compiler thread") \
2093 range(0, max_jint) \
2094 \
2095 product(intx, Tier4LoadFeedback, 3, \
2096 "Tier 4 thresholds will increase twofold when C2 queue size " \
2097 "reaches this amount per compiler thread") \
2098 range(0, max_jint) \
2099 \
2100 product(intx, TieredCompileTaskTimeout, 50, \
2101 "Kill compile task if method was not used within " \
2102 "given timeout in milliseconds") \
2103 range(0, max_intx) \
2104 \
2105 product(intx, TieredStopAtLevel, 4, \
2106 "Stop at given compilation level") \
2107 range(0, 4) \
2108 \
2109 product(intx, Tier0ProfilingStartPercentage, 200, \
2110 "Start profiling in interpreter if the counters exceed tier 3 " \
2111 "thresholds (tier 4 thresholds with " \
2112 "CompilationMode=high-only|high-only-quick-internal)" \
2113 "by the specified percentage") \
2114 range(0, max_jint) \
2115 \
2116 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \
2117 "Increase the compile threshold for C1 compilation if the code " \
2118 "cache is filled by the specified percentage") \
2119 range(0, 99) \
2120 \
2121 product(intx, TieredRateUpdateMinTime, 1, \
2122 "Minimum rate sampling interval (in milliseconds)") \
2123 range(0, max_intx) \
2124 \
2125 product(intx, TieredRateUpdateMaxTime, 25, \
2126 "Maximum rate sampling interval (in milliseconds)") \
2127 range(0, max_intx) \
2128 \
2129 product(ccstr, CompilationMode, "default", \
2130 "Compilation modes: " \
2131 "default: normal tiered compilation; " \
2132 "quick-only: C1-only mode; " \
2133 "high-only: C2/JVMCI-only mode; " \
2134 "high-only-quick-internal: C2/JVMCI-only mode, " \
2135 "with JVMCI compiler compiled with C1.") \
2136 \
2137 product_pd(bool, TieredCompilation, \
2138 "Enable tiered compilation") \
2139 \
2140 product(bool, PrintTieredEvents, false, \
2141 "Print tiered events notifications") \
2142 \
2143 product_pd(intx, OnStackReplacePercentage, \
2144 "NON_TIERED number of method invocations/branches (expressed as " \
2145 "% of CompileThreshold) before (re-)compiling OSR code") \
2146 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \
2147 \
2148 product(intx, InterpreterProfilePercentage, 33, \
2149 "NON_TIERED number of method invocations/branches (expressed as " \
2150 "% of CompileThreshold) before profiling in the interpreter") \
2151 range(0, 100) \
2152 \
2153 develop(intx, DesiredMethodLimit, 8000, \
2154 "The desired maximum method size (in bytecodes) after inlining") \
2155 \
2156 develop(intx, HugeMethodLimit, 8000, \
2157 "Don't compile methods larger than this if " \
2158 "+DontCompileHugeMethods") \
2159 \
2160 /* Properties for Java libraries */ \
2161 \
2162 product(uint64_t, MaxDirectMemorySize, 0, \
2163 "Maximum total size of NIO direct-buffer allocations") \
2164 range(0, max_jlong) \
2165 \
2166 /* Flags used for temporary code during development */ \
2167 \
2168 diagnostic(bool, UseNewCode, false, \
2169 "Testing Only: Use the new version while testing") \
2170 \
2171 diagnostic(bool, UseNewCode2, false, \
2172 "Testing Only: Use the new version while testing") \
2173 \
2174 diagnostic(bool, UseNewCode3, false, \
2175 "Testing Only: Use the new version while testing") \
2176 \
2177 /* flags for performance data collection */ \
2178 \
2179 product(bool, UsePerfData, true, \
2180 "Flag to disable jvmstat instrumentation for performance testing "\
2181 "and problem isolation purposes") \
2182 \
2183 product(bool, PerfDataSaveToFile, false, \
2184 "Save PerfData memory to hsperfdata_<pid> file on exit") \
2185 \
2186 product(ccstr, PerfDataSaveFile, NULL, \
2187 "Save PerfData memory to the specified absolute pathname. " \
2188 "The string %p in the file name (if present) " \
2189 "will be replaced by pid") \
2190 \
2191 product(intx, PerfDataSamplingInterval, 50, \
2192 "Data sampling interval (in milliseconds)") \
2193 range(PeriodicTask::min_interval, max_jint) \
2194 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \
2195 \
2196 product(bool, PerfDisableSharedMem, false, \
2197 "Store performance data in standard memory") \
2198 \
2199 product(intx, PerfDataMemorySize, 32*K, \
2200 "Size of performance data memory region. Will be rounded " \
2201 "up to a multiple of the native os page size.") \
2202 range(128, 32*64*K) \
2203 \
2204 product(intx, PerfMaxStringConstLength, 1024, \
2205 "Maximum PerfStringConstant string length before truncation") \
2206 range(32, 32*K) \
2207 \
2208 product(bool, PerfAllowAtExitRegistration, false, \
2209 "Allow registration of atexit() methods") \
2210 \
2211 product(bool, PerfBypassFileSystemCheck, false, \
2212 "Bypass Win32 file system criteria checks (Windows Only)") \
2213 \
2214 product(intx, UnguardOnExecutionViolation, 0, \
2215 "Unguard page and retry on no-execute fault (Win32 only) " \
2216 "0=off, 1=conservative, 2=aggressive") \
2217 range(0, 2) \
2218 \
2219 /* Serviceability Support */ \
2220 \
2221 product(bool, ManagementServer, false, \
2222 "Create JMX Management Server") \
2223 \
2224 product(bool, DisableAttachMechanism, false, \
2225 "Disable mechanism that allows tools to attach to this VM") \
2226 \
2227 product(bool, StartAttachListener, false, \
2228 "Always start Attach Listener at VM startup") \
2229 \
2230 product(bool, EnableDynamicAgentLoading, true, \
2231 "Allow tools to load agents with the attach mechanism") \
2232 \
2233 manageable(bool, PrintConcurrentLocks, false, \
2234 "Print java.util.concurrent locks in thread dump") \
2235 \
2236 /* Shared spaces */ \
2237 \
2238 product(bool, UseSharedSpaces, true, \
2239 "Use shared spaces for metadata") \
2240 \
2241 product(bool, VerifySharedSpaces, false, \
2242 "Verify integrity of shared spaces") \
2243 \
2244 product(bool, RequireSharedSpaces, false, \
2245 "Require shared spaces for metadata") \
2246 \
2247 product(bool, DumpSharedSpaces, false, \
2248 "Special mode: JVM reads a class list, loads classes, builds " \
2249 "shared spaces, and dumps the shared spaces to a file to be " \
2250 "used in future JVM runs") \
2251 \
2252 product(bool, DynamicDumpSharedSpaces, false, \
2253 "Dynamic archive") \
2254 \
2255 product(bool, PrintSharedArchiveAndExit, false, \
2256 "Print shared archive file contents") \
2257 \
2258 product(bool, PrintSharedDictionary, false, \
2259 "If PrintSharedArchiveAndExit is true, also print the shared " \
2260 "dictionary") \
2261 \
2262 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \
2263 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \
2264 "Address to allocate shared memory region for class data") \
2265 range(0, SIZE_MAX) \
2266 \
2267 product(ccstr, SharedArchiveConfigFile, NULL, \
2268 "Data to add to the CDS archive file") \
2269 \
2270 product(uintx, SharedSymbolTableBucketSize, 4, \
2271 "Average number of symbols per bucket in shared table") \
2272 range(2, 246) \
2273 \
2274 diagnostic(bool, AllowArchivingWithJavaAgent, false, \
2275 "Allow Java agent to be run with CDS dumping") \
2276 \
2277 diagnostic(bool, PrintMethodHandleStubs, false, \
2278 "Print generated stub code for method handles") \
2279 \
2280 diagnostic(bool, VerifyMethodHandles, trueInDebug, \
2281 "perform extra checks when constructing method handles") \
2282 \
2283 diagnostic(bool, ShowHiddenFrames, false, \
2284 "show method handle implementation frames (usually hidden)") \
2285 \
2286 experimental(bool, TrustFinalNonStaticFields, false, \
2287 "trust final non-static declarations for constant folding") \
2288 \
2289 diagnostic(bool, FoldStableValues, true, \
2290 "Optimize loads from stable fields (marked w/ @Stable)") \
2291 \
2292 diagnostic(int, UseBootstrapCallInfo, 1, \
2293 "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2294 "resolved before the bootstrap method is called; 1: when a BSM " \
2295 "that may accept a BootstrapCallInfo is detected, use that API " \
2296 "to pass BSM arguments, which allows the BSM to delay their " \
2297 "resolution; 2+: stress test the BCI API by calling more BSMs " \
2298 "via that API, instead of with the eagerly-resolved array.") \
2299 \
2300 diagnostic(bool, PauseAtStartup, false, \
2301 "Causes the VM to pause at startup time and wait for the pause " \
2302 "file to be removed (default: ./vm.paused.<pid>)") \
2303 \
2304 diagnostic(ccstr, PauseAtStartupFile, NULL, \
2305 "The file to create and for whose removal to await when pausing " \
2306 "at startup. (default: ./vm.paused.<pid>)") \
2307 \
2308 diagnostic(bool, PauseAtExit, false, \
2309 "Pause and wait for keypress on exit if a debugger is attached") \
2310 \
2311 product(bool, ExtendedDTraceProbes, false, \
2312 "Enable performance-impacting dtrace probes") \
2313 \
2314 product(bool, DTraceMethodProbes, false, \
2315 "Enable dtrace probes for method-entry and method-exit") \
2316 \
2317 product(bool, DTraceAllocProbes, false, \
2318 "Enable dtrace probes for object allocation") \
2319 \
2320 product(bool, DTraceMonitorProbes, false, \
2321 "Enable dtrace probes for monitor events") \
2322 \
2323 product(bool, RelaxAccessControlCheck, false, \
2324 "Relax the access control checks in the verifier") \
2325 \
2326 product(uintx, StringTableSize, defaultStringTableSize, \
2327 "Number of buckets in the interned String table " \
2328 "(will be rounded to nearest higher power of 2)") \
2329 range(minimumStringTableSize, 16777216ul /* 2^24 */) \
2330 \
2331 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \
2332 "Number of buckets in the JVM internal Symbol table") \
2333 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \
2334 \
2335 product(bool, UseStringDeduplication, false, \
2336 "Use string deduplication") \
2337 \
2338 product(uintx, StringDeduplicationAgeThreshold, 3, \
2339 "A string must reach this age (or be promoted to an old region) " \
2340 "to be considered for deduplication") \
2341 range(1, markWord::max_age) \
2342 \
2343 diagnostic(bool, StringDeduplicationResizeALot, false, \
2344 "Force table resize every time the table is scanned") \
2345 \
2346 diagnostic(bool, StringDeduplicationRehashALot, false, \
2347 "Force table rehash every time the table is scanned") \
2348 \
2349 diagnostic(bool, WhiteBoxAPI, false, \
2350 "Enable internal testing APIs") \
2351 \
2352 experimental(intx, SurvivorAlignmentInBytes, 0, \
2353 "Default survivor space alignment in bytes") \
2354 range(8, 256) \
2355 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \
2356 \
2357 product(ccstr, DumpLoadedClassList, NULL, \
2358 "Dump the names all loaded classes, that could be stored into " \
2359 "the CDS archive, in the specified file") \
2360 \
2361 product(ccstr, SharedClassListFile, NULL, \
2362 "Override the default CDS class list") \
2363 \
2364 product(ccstr, SharedArchiveFile, NULL, \
2365 "Override the default location of the CDS archive file") \
2366 \
2367 product(ccstr, ArchiveClassesAtExit, NULL, \
2368 "The path and name of the dynamic archive file") \
2369 \
2370 product(ccstr, ExtraSharedClassListFile, NULL, \
2371 "Extra classlist for building the CDS archive file") \
2372 \
2373 diagnostic(intx, ArchiveRelocationMode, 0, \
2374 "(0) first map at preferred address, and if " \
2375 "unsuccessful, map at alternative address (default); " \
2376 "(1) always map at alternative address; " \
2377 "(2) always map at preferred address, and if unsuccessful, " \
2378 "do not map the archive") \
2379 range(0, 2) \
2380 \
2381 experimental(size_t, ArrayAllocatorMallocLimit, (size_t)-1, \
2382 "Allocation less than this value will be allocated " \
2383 "using malloc. Larger allocations will use mmap.") \
2384 \
2385 experimental(bool, AlwaysAtomicAccesses, false, \
2386 "Accesses to all variables should always be atomic") \
2387 \
2388 diagnostic(bool, UseUnalignedAccesses, false, \
2389 "Use unaligned memory accesses in Unsafe") \
2390 \
2391 product_pd(bool, PreserveFramePointer, \
2392 "Use the FP register for holding the frame pointer " \
2393 "and not as a general purpose register.") \
2394 \
2395 diagnostic(bool, CheckIntrinsics, true, \
2396 "When a class C is loaded, check that " \
2397 "(1) all intrinsics defined by the VM for class C are present "\
2398 "in the loaded class file and are marked with the " \
2399 "@HotSpotIntrinsicCandidate annotation, that " \
2400 "(2) there is an intrinsic registered for all loaded methods " \
2401 "that are annotated with the @HotSpotIntrinsicCandidate " \
2402 "annotation, and that " \
2403 "(3) no orphan methods exist for class C (i.e., methods for " \
2404 "which the VM declares an intrinsic but that are not declared "\
2405 "in the loaded class C. " \
2406 "Check (3) is available only in debug builds.") \
2407 \
2408 diagnostic_pd(intx, InitArrayShortSize, \
2409 "Threshold small size (in bytes) for clearing arrays. " \
2410 "Anything this size or smaller may get converted to discrete " \
2411 "scalar stores.") \
2412 range(0, max_intx) \
2413 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \
2414 \
2415 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \
2416 "Disable backwards compatibility for compile commands.") \
2417 \
2418 diagnostic(bool, CompilerDirectivesPrint, false, \
2419 "Print compiler directives on installation.") \
2420 diagnostic(int, CompilerDirectivesLimit, 50, \
2421 "Limit on number of compiler directives.") \
2422 \
2423 product(ccstr, AllocateHeapAt, NULL, \
2424 "Path to the directoy where a temporary file will be created " \
2425 "to use as the backing store for Java Heap.") \
2426 \
2427 experimental(ccstr, AllocateOldGenAt, NULL, \
2428 "Path to the directoy where a temporary file will be " \
2429 "created to use as the backing store for old generation." \
2430 "File of size Xmx is pre-allocated for performance reason, so" \
2431 "we need that much space available") \
2432 \
2433 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \
2434 "Run periodic metaspace verifications (0 - none, " \
2435 "1 - always, >1 every nth interval)") \
2436 \
2437 diagnostic(bool, ShowRegistersOnAssert, true, \
2438 "On internal errors, include registers in error report.") \
2439 \
2440 diagnostic(bool, UseSwitchProfiling, true, \
2441 "leverage profiling for table/lookup switch") \
2442 \
2443 develop(bool, TraceMemoryWriteback, false, \
2444 "Trace memory writeback operations") \
2445 \
2446 JFR_ONLY(product(bool, FlightRecorder, false, \
2447 "(Deprecated) Enable Flight Recorder")) \
2448 \
2449 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \
2450 "Flight Recorder options")) \
2451 \
2452 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \
2453 "Start flight recording with options")) \
2454 \
2455 experimental(bool, UseFastUnorderedTimeStamps, false, \
2456 "Use platform unstable time where supported for timestamps only") \
2457 \
2458 product(bool, UseEmptySlotsInSupers, true, \
2459 "Allow allocating fields in empty slots of super-classes") \
2460 \
2461 diagnostic(bool, DeoptimizeNMethodBarriersALot, false, \
2462 "Make nmethod barriers deoptimise a lot.") \
2463
2464 // Interface macros
2465 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2466 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name;
2467 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
2468 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name;
2469 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
2470 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
2471 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
2472 #ifdef PRODUCT
2473 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value;
2474 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name;
2475 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value;
2476 #else
2477 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name;
2478 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name;
2479 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2480 #endif // PRODUCT
2481 // Special LP64 flags, product only needed for now.
2482 #ifdef _LP64
2483 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2484 #else
2485 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
2486 #endif // _LP64
2487
2488 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \
2489 DECLARE_PD_DEVELOPER_FLAG, \
2490 DECLARE_PRODUCT_FLAG, \
2491 DECLARE_PD_PRODUCT_FLAG, \
2492 DECLARE_DIAGNOSTIC_FLAG, \
2493 DECLARE_PD_DIAGNOSTIC_FLAG, \
2494 DECLARE_EXPERIMENTAL_FLAG, \
2495 DECLARE_NOTPRODUCT_FLAG, \
2496 DECLARE_MANAGEABLE_FLAG, \
2497 DECLARE_PRODUCT_RW_FLAG, \
2498 DECLARE_LP64_PRODUCT_FLAG, \
2499 IGNORE_RANGE, \
2500 IGNORE_CONSTRAINT)
2501
2502 #endif // SHARE_RUNTIME_GLOBALS_HPP
--- EOF ---