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, PrintVMQWaitTime, false, \ 266 "(Deprecated) Print out the waiting time in VM operation queue") \ 267 \ 268 product(bool, MethodFlushing, true, \ 269 "Reclamation of zombie and not-entrant methods") \ 270 \ 271 develop(bool, VerifyStack, false, \ 272 "Verify stack of each thread when it is entering a runtime call") \ 273 \ 274 diagnostic(bool, ForceUnreachable, false, \ 275 "Make all non code cache addresses to be unreachable by " \ 276 "forcing use of 64bit literal fixups") \ 277 \ 278 notproduct(bool, StressDerivedPointers, false, \ 279 "Force scavenge when a derived pointer is detected on stack " \ 280 "after rtm call") \ 281 \ 282 develop(bool, TraceDerivedPointers, false, \ 283 "Trace traversal of derived pointers on stack") \ 284 \ 285 notproduct(bool, TraceCodeBlobStacks, false, \ 286 "Trace stack-walk of codeblobs") \ 287 \ 288 notproduct(bool, PrintRewrites, false, \ 289 "Print methods that are being rewritten") \ 290 \ 291 product(bool, UseInlineCaches, true, \ 292 "Use Inline Caches for virtual calls ") \ 293 \ 294 diagnostic(bool, InlineArrayCopy, true, \ 295 "Inline arraycopy native that is known to be part of " \ 296 "base library DLL") \ 297 \ 298 diagnostic(bool, InlineObjectHash, true, \ 299 "Inline Object::hashCode() native that is known to be part " \ 300 "of base library DLL") \ 301 \ 302 diagnostic(bool, InlineNatives, true, \ 303 "Inline natives that are known to be part of base library DLL") \ 304 \ 305 diagnostic(bool, InlineMathNatives, true, \ 306 "Inline SinD, CosD, etc.") \ 307 \ 308 diagnostic(bool, InlineClassNatives, true, \ 309 "Inline Class.isInstance, etc") \ 310 \ 311 diagnostic(bool, InlineThreadNatives, true, \ 312 "Inline Thread.currentThread, etc") \ 313 \ 314 diagnostic(bool, InlineUnsafeOps, true, \ 315 "Inline memory ops (native methods) from Unsafe") \ 316 \ 317 product(bool, CriticalJNINatives, true, \ 318 "Check for critical JNI entry points") \ 319 \ 320 notproduct(bool, StressCriticalJNINatives, false, \ 321 "Exercise register saving code in critical natives") \ 322 \ 323 diagnostic(bool, UseAESIntrinsics, false, \ 324 "Use intrinsics for AES versions of crypto") \ 325 \ 326 diagnostic(bool, UseAESCTRIntrinsics, false, \ 327 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 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 constraint(DisableIntrinsicConstraintFunc,AfterErgo) \ 356 \ 357 diagnostic(ccstrlist, ControlIntrinsic, "", \ 358 "Control intrinsics using a list of +/- (internal) names, " \ 359 "separated by commas") \ 360 constraint(ControlIntrinsicConstraintFunc,AfterErgo) \ 361 \ 362 develop(bool, TraceCallFixup, false, \ 363 "Trace all call fixups") \ 364 \ 365 develop(bool, DeoptimizeALot, false, \ 366 "Deoptimize at every exit from the runtime system") \ 367 \ 368 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 369 "A comma separated list of bcis to deoptimize at") \ 370 \ 371 develop(bool, DeoptimizeRandom, false, \ 372 "Deoptimize random frames on random exit from the runtime system")\ 373 \ 374 notproduct(bool, ZombieALot, false, \ 375 "Create zombies (non-entrant) at exit from the runtime system") \ 376 \ 377 notproduct(bool, WalkStackALot, false, \ 378 "Trace stack (no print) at every exit from the runtime system") \ 379 \ 380 product(bool, Debugging, false, \ 381 "Set when executing debug methods in debug.cpp " \ 382 "(to prevent triggering assertions)") \ 383 \ 384 notproduct(bool, VerifyLastFrame, false, \ 385 "Verify oops on last frame on entry to VM") \ 386 \ 387 product(bool, SafepointTimeout, false, \ 388 "Time out and warn or fail after SafepointTimeoutDelay " \ 389 "milliseconds if failed to reach safepoint") \ 390 \ 391 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 392 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 393 \ 394 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 395 "Abort upon failure to complete VM operation promptly") \ 396 \ 397 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 398 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 399 range(0, max_intx) \ 400 \ 401 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 402 /* typically, at most a few retries are needed */ \ 403 product(intx, SuspendRetryCount, 50, \ 404 "Maximum retry count for an external suspend request") \ 405 range(0, max_intx) \ 406 \ 407 product(intx, SuspendRetryDelay, 5, \ 408 "Milliseconds to delay per retry (* current_retry_count)") \ 409 range(0, max_intx) \ 410 \ 411 product(bool, AssertOnSuspendWaitFailure, false, \ 412 "Assert/Guarantee on external suspend wait failure") \ 413 \ 414 product(bool, TraceSuspendWaitFailures, false, \ 415 "Trace external suspend wait failures") \ 416 \ 417 product(bool, MaxFDLimit, true, \ 418 "Bump the number of file descriptors to maximum (Unix only)") \ 419 \ 420 diagnostic(bool, LogEvents, true, \ 421 "Enable the various ring buffer event logs") \ 422 \ 423 diagnostic(uintx, LogEventsBufferEntries, 20, \ 424 "Number of ring buffer event logs") \ 425 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 426 \ 427 diagnostic(bool, BytecodeVerificationRemote, true, \ 428 "Enable the Java bytecode verifier for remote classes") \ 429 \ 430 diagnostic(bool, BytecodeVerificationLocal, false, \ 431 "Enable the Java bytecode verifier for local classes") \ 432 \ 433 develop(bool, ForceFloatExceptions, trueInDebug, \ 434 "Force exceptions on FP stack under/overflow") \ 435 \ 436 develop(bool, VerifyStackAtCalls, false, \ 437 "Verify that the stack pointer is unchanged after calls") \ 438 \ 439 develop(bool, TraceJavaAssertions, false, \ 440 "Trace java language assertions") \ 441 \ 442 notproduct(bool, VerifyCodeCache, false, \ 443 "Verify code cache on memory allocation/deallocation") \ 444 \ 445 develop(bool, UseMallocOnly, false, \ 446 "Use only malloc/free for allocation (no resource area/arena)") \ 447 \ 448 develop(bool, ZapResourceArea, trueInDebug, \ 449 "Zap freed resource/arena space with 0xABABABAB") \ 450 \ 451 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 452 "Zap freed VM handle space with 0xBCBCBCBC") \ 453 \ 454 notproduct(bool, ZapStackSegments, trueInDebug, \ 455 "Zap allocated/freed stack segments with 0xFADFADED") \ 456 \ 457 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 458 "Zap unused heap space with 0xBAADBABE") \ 459 \ 460 develop(bool, CheckZapUnusedHeapArea, false, \ 461 "Check zapping of unused heap space") \ 462 \ 463 develop(bool, ZapFillerObjects, trueInDebug, \ 464 "Zap filler objects with 0xDEAFBABE") \ 465 \ 466 develop(bool, PrintVMMessages, true, \ 467 "Print VM messages on console") \ 468 \ 469 notproduct(uintx, ErrorHandlerTest, 0, \ 470 "If > 0, provokes an error after VM initialization; the value " \ 471 "determines which error to provoke. See test_error_handler() " \ 472 "in vmError.cpp.") \ 473 \ 474 notproduct(uintx, TestCrashInErrorHandler, 0, \ 475 "If > 0, provokes an error inside VM error handler (a secondary " \ 476 "crash). see test_error_handler() in vmError.cpp") \ 477 \ 478 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 479 "If true, tests SafeFetch inside error handler.") \ 480 \ 481 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 482 "If true, simulates an unresponsive error handler.") \ 483 \ 484 develop(bool, Verbose, false, \ 485 "Print additional debugging information from other modes") \ 486 \ 487 develop(bool, PrintMiscellaneous, false, \ 488 "Print uncategorized debugging information (requires +Verbose)") \ 489 \ 490 develop(bool, WizardMode, false, \ 491 "Print much more debugging information") \ 492 \ 493 product(bool, ShowMessageBoxOnError, false, \ 494 "Keep process alive on VM fatal error") \ 495 \ 496 product(bool, CreateCoredumpOnCrash, true, \ 497 "Create core/mini dump on VM fatal error") \ 498 \ 499 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 500 "Timeout, in seconds, to limit the time spent on writing an " \ 501 "error log in case of a crash.") \ 502 range(0, (uint64_t)max_jlong/1000) \ 503 \ 504 product_pd(bool, UseOSErrorReporting, \ 505 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 506 \ 507 product(bool, SuppressFatalErrorMessage, false, \ 508 "Report NO fatal error message (avoid deadlock)") \ 509 \ 510 product(ccstrlist, OnError, "", \ 511 "Run user-defined commands on fatal error; see VMError.cpp " \ 512 "for examples") \ 513 \ 514 product(ccstrlist, OnOutOfMemoryError, "", \ 515 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 516 \ 517 manageable(bool, HeapDumpBeforeFullGC, false, \ 518 "Dump heap to file before any major stop-the-world GC") \ 519 \ 520 manageable(bool, HeapDumpAfterFullGC, false, \ 521 "Dump heap to file after any major stop-the-world GC") \ 522 \ 523 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 524 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 525 \ 526 manageable(ccstr, HeapDumpPath, NULL, \ 527 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 528 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 529 "in the working directory)") \ 530 \ 531 develop(bool, BreakAtWarning, false, \ 532 "Execute breakpoint upon encountering VM warning") \ 533 \ 534 product(ccstr, NativeMemoryTracking, "off", \ 535 "Native memory tracking options") \ 536 \ 537 diagnostic(bool, PrintNMTStatistics, false, \ 538 "Print native memory tracking summary data if it is on") \ 539 \ 540 diagnostic(bool, LogCompilation, false, \ 541 "Log compilation activity in detail to LogFile") \ 542 \ 543 product(bool, PrintCompilation, false, \ 544 "Print compilations") \ 545 \ 546 product(bool, PrintExtendedThreadInfo, false, \ 547 "Print more information in thread dump") \ 548 \ 549 diagnostic(intx, ScavengeRootsInCode, 2, \ 550 "0: do not allow scavengable oops in the code cache; " \ 551 "1: allow scavenging from the code cache; " \ 552 "2: emit as many constants as the compiler can see") \ 553 range(0, 2) \ 554 \ 555 product(bool, AlwaysRestoreFPU, false, \ 556 "Restore the FPU control word after every JNI call (expensive)") \ 557 \ 558 diagnostic(bool, PrintCompilation2, false, \ 559 "Print additional statistics per compilation") \ 560 \ 561 diagnostic(bool, PrintAdapterHandlers, false, \ 562 "Print code generated for i2c/c2i adapters") \ 563 \ 564 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 565 "Verify that i2c/c2i adapters are called properly") \ 566 \ 567 develop(bool, VerifyAdapterSharing, false, \ 568 "Verify that the code for shared adapters is the equivalent") \ 569 \ 570 diagnostic(bool, PrintAssembly, false, \ 571 "Print assembly code (using external disassembler.so)") \ 572 \ 573 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 574 "Print options string passed to disassembler.so") \ 575 \ 576 notproduct(bool, PrintNMethodStatistics, false, \ 577 "Print a summary statistic for the generated nmethods") \ 578 \ 579 diagnostic(bool, PrintNMethods, false, \ 580 "Print assembly code for nmethods when generated") \ 581 \ 582 diagnostic(bool, PrintNativeNMethods, false, \ 583 "Print assembly code for native nmethods when generated") \ 584 \ 585 develop(bool, PrintDebugInfo, false, \ 586 "Print debug information for all nmethods when generated") \ 587 \ 588 develop(bool, PrintRelocations, false, \ 589 "Print relocation information for all nmethods when generated") \ 590 \ 591 develop(bool, PrintDependencies, false, \ 592 "Print dependency information for all nmethods when generated") \ 593 \ 594 develop(bool, PrintExceptionHandlers, false, \ 595 "Print exception handler tables for all nmethods when generated") \ 596 \ 597 develop(bool, StressCompiledExceptionHandlers, false, \ 598 "Exercise compiled exception handlers") \ 599 \ 600 develop(bool, InterceptOSException, false, \ 601 "Start debugger when an implicit OS (e.g. NULL) " \ 602 "exception happens") \ 603 \ 604 product(bool, PrintCodeCache, false, \ 605 "Print the code cache memory usage when exiting") \ 606 \ 607 develop(bool, PrintCodeCache2, false, \ 608 "Print detailed usage information on the code cache when exiting")\ 609 \ 610 product(bool, PrintCodeCacheOnCompilation, false, \ 611 "Print the code cache memory usage each time a method is " \ 612 "compiled") \ 613 \ 614 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 615 "Print code heap usage statistics on exit and on full condition") \ 616 \ 617 diagnostic(bool, PrintStubCode, false, \ 618 "Print generated stub code") \ 619 \ 620 product(bool, StackTraceInThrowable, true, \ 621 "Collect backtrace in throwable when exception happens") \ 622 \ 623 product(bool, OmitStackTraceInFastThrow, true, \ 624 "Omit backtraces for some 'hot' exceptions in optimized code") \ 625 \ 626 manageable(bool, ShowCodeDetailsInExceptionMessages, false, \ 627 "Show exception messages from RuntimeExceptions that contain " \ 628 "snippets of the failing code. Disable this to improve privacy.") \ 629 \ 630 product(bool, PrintWarnings, true, \ 631 "Print JVM warnings to output stream") \ 632 \ 633 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 634 "Print warnings for stalled SpinLocks") \ 635 \ 636 product(bool, RegisterFinalizersAtInit, true, \ 637 "Register finalizable objects at end of Object.<init> or " \ 638 "after allocation") \ 639 \ 640 develop(bool, RegisterReferences, true, \ 641 "Tell whether the VM should register soft/weak/final/phantom " \ 642 "references") \ 643 \ 644 develop(bool, IgnoreRewrites, false, \ 645 "Suppress rewrites of bytecodes in the oopmap generator. " \ 646 "This is unsafe!") \ 647 \ 648 develop(bool, PrintCodeCacheExtension, false, \ 649 "Print extension of code cache") \ 650 \ 651 develop(bool, UsePrivilegedStack, true, \ 652 "Enable the security JVM functions") \ 653 \ 654 develop(bool, ProtectionDomainVerification, true, \ 655 "Verify protection domain before resolution in system dictionary")\ 656 \ 657 product(bool, ClassUnloading, true, \ 658 "Do unloading of classes") \ 659 \ 660 product(bool, ClassUnloadingWithConcurrentMark, true, \ 661 "Do unloading of classes with a concurrent marking cycle") \ 662 \ 663 develop(bool, DisableStartThread, false, \ 664 "Disable starting of additional Java threads " \ 665 "(for debugging only)") \ 666 \ 667 develop(bool, MemProfiling, false, \ 668 "Write memory usage profiling to log file") \ 669 \ 670 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 671 "Print the system dictionary at exit") \ 672 \ 673 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 674 "Dynamically resize system dictionaries as needed") \ 675 \ 676 product(bool, AlwaysLockClassLoader, false, \ 677 "Require the VM to acquire the class loader lock before calling " \ 678 "loadClass() even for class loaders registering " \ 679 "as parallel capable") \ 680 \ 681 product(bool, AllowParallelDefineClass, false, \ 682 "Allow parallel defineClass requests for class loaders " \ 683 "registering as parallel capable") \ 684 \ 685 product_pd(bool, DontYieldALot, \ 686 "Throw away obvious excess yield calls") \ 687 \ 688 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 689 "Disable the use of stack guard pages if the JVM is loaded " \ 690 "on the primordial process thread") \ 691 \ 692 diagnostic(bool, AsyncDeflateIdleMonitors, true, \ 693 "Deflate idle monitors using the ServiceThread.") \ 694 \ 695 /* notice: the max range value here is max_jint, not max_intx */ \ 696 /* because of overflow issue */ \ 697 diagnostic(intx, AsyncDeflationInterval, 250, \ 698 "Async deflate idle monitors every so many milliseconds when " \ 699 "MonitorUsedDeflationThreshold is exceeded (0 is off).") \ 700 range(0, max_jint) \ 701 \ 702 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 703 "Percentage of used monitors before triggering deflation (0 is " \ 704 "off). The check is performed on GuaranteedSafepointInterval " \ 705 "or AsyncDeflationInterval.") \ 706 range(0, 100) \ 707 \ 708 experimental(intx, hashCode, 5, \ 709 "(Unstable) select hashCode generation algorithm") \ 710 \ 711 product(bool, FilterSpuriousWakeups, true, \ 712 "When true prevents OS-level spurious, or premature, wakeups " \ 713 "from Object.wait (Ignored for Windows)") \ 714 \ 715 product(bool, ReduceSignalUsage, false, \ 716 "Reduce the use of OS signals in Java and/or the VM") \ 717 \ 718 develop(bool, LoadLineNumberTables, true, \ 719 "Tell whether the class file parser loads line number tables") \ 720 \ 721 develop(bool, LoadLocalVariableTables, true, \ 722 "Tell whether the class file parser loads local variable tables") \ 723 \ 724 develop(bool, LoadLocalVariableTypeTables, true, \ 725 "Tell whether the class file parser loads local variable type" \ 726 "tables") \ 727 \ 728 product(bool, AllowUserSignalHandlers, false, \ 729 "Do not complain if the application installs signal handlers " \ 730 "(Unix only)") \ 731 \ 732 product(bool, UseSignalChaining, true, \ 733 "Use signal-chaining to invoke signal handlers installed " \ 734 "by the application (Unix only)") \ 735 \ 736 product(bool, RestoreMXCSROnJNICalls, false, \ 737 "Restore MXCSR when returning from JNI calls") \ 738 \ 739 product(bool, CheckJNICalls, false, \ 740 "Verify all arguments to JNI calls") \ 741 \ 742 product(bool, UseFastJNIAccessors, true, \ 743 "Use optimized versions of Get<Primitive>Field") \ 744 \ 745 product(intx, MaxJNILocalCapacity, 65536, \ 746 "Maximum allowable local JNI handle capacity to " \ 747 "EnsureLocalCapacity() and PushLocalFrame(), " \ 748 "where <= 0 is unlimited, default: 65536") \ 749 range(min_intx, max_intx) \ 750 \ 751 product(bool, EagerXrunInit, false, \ 752 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 753 "but not all -Xrun libraries may support the state of the VM " \ 754 "at this time") \ 755 \ 756 product(bool, PreserveAllAnnotations, false, \ 757 "Preserve RuntimeInvisibleAnnotations as well " \ 758 "as RuntimeVisibleAnnotations") \ 759 \ 760 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 761 "Number of OutOfMemoryErrors preallocated with backtrace") \ 762 \ 763 product(bool, UseXMMForArrayCopy, false, \ 764 "Use SSE2 MOVQ instruction for Arraycopy") \ 765 \ 766 notproduct(bool, PrintFieldLayout, false, \ 767 "Print field layout for each class") \ 768 \ 769 /* Need to limit the extent of the padding to reasonable size. */\ 770 /* 8K is well beyond the reasonable HW cache line size, even with */\ 771 /* aggressive prefetching, while still leaving the room for segregating */\ 772 /* among the distinct pages. */\ 773 product(intx, ContendedPaddingWidth, 128, \ 774 "How many bytes to pad the fields/classes marked @Contended with")\ 775 range(0, 8192) \ 776 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 777 \ 778 product(bool, EnableContended, true, \ 779 "Enable @Contended annotation support") \ 780 \ 781 product(bool, RestrictContended, true, \ 782 "Restrict @Contended to trusted classes") \ 783 \ 784 product(bool, UseBiasedLocking, false, \ 785 "(Deprecated) Enable biased locking in JVM") \ 786 \ 787 product(intx, BiasedLockingStartupDelay, 0, \ 788 "(Deprecated) Number of milliseconds to wait before enabling " \ 789 "biased locking") \ 790 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 791 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 792 \ 793 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 794 "(Deprecated) Print statistics of biased locking in JVM") \ 795 \ 796 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 797 "(Deprecated) Threshold of number of revocations per type to " \ 798 "try to rebias all objects in the heap of that type") \ 799 range(0, max_intx) \ 800 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 801 \ 802 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 803 "(Deprecated) Threshold of number of revocations per type to " \ 804 "permanently revoke biases of all objects in the heap of that " \ 805 "type") \ 806 range(0, max_intx) \ 807 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 808 \ 809 product(intx, BiasedLockingDecayTime, 25000, \ 810 "(Deprecated) Decay time (in milliseconds) to re-enable bulk " \ 811 "rebiasing of a type after previous bulk rebias") \ 812 range(500, max_intx) \ 813 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 814 \ 815 product(bool, ExitOnOutOfMemoryError, false, \ 816 "JVM exits on the first occurrence of an out-of-memory error") \ 817 \ 818 product(bool, CrashOnOutOfMemoryError, false, \ 819 "JVM aborts, producing an error log and core/mini dump, on the " \ 820 "first occurrence of an out-of-memory error") \ 821 \ 822 /* tracing */ \ 823 \ 824 develop(bool, StressRewriter, false, \ 825 "Stress linktime bytecode rewriting") \ 826 \ 827 product(ccstr, TraceJVMTI, NULL, \ 828 "Trace flags for JVMTI functions and events") \ 829 \ 830 /* This option can change an EMCP method into an obsolete method. */ \ 831 /* This can affect tests that except specific methods to be EMCP. */ \ 832 /* This option should be used with caution. */ \ 833 product(bool, StressLdcRewrite, false, \ 834 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 835 \ 836 /* change to false by default sometime after Mustang */ \ 837 product(bool, VerifyMergedCPBytecodes, true, \ 838 "Verify bytecodes after RedefineClasses constant pool merging") \ 839 \ 840 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 841 "(Deprecated) Allow redefinition to add and delete private " \ 842 "static or final methods for compatibility with old releases") \ 843 \ 844 develop(bool, TraceBytecodes, false, \ 845 "Trace bytecode execution") \ 846 \ 847 develop(bool, TraceICs, false, \ 848 "Trace inline cache changes") \ 849 \ 850 notproduct(bool, TraceInvocationCounterOverflow, false, \ 851 "Trace method invocation counter overflow") \ 852 \ 853 develop(bool, TraceInlineCacheClearing, false, \ 854 "Trace clearing of inline caches in nmethods") \ 855 \ 856 develop(bool, TraceDependencies, false, \ 857 "Trace dependencies") \ 858 \ 859 develop(bool, VerifyDependencies, trueInDebug, \ 860 "Exercise and verify the compilation dependency mechanism") \ 861 \ 862 develop(bool, TraceNewOopMapGeneration, false, \ 863 "Trace OopMapGeneration") \ 864 \ 865 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 866 "Trace OopMapGeneration: print detailed cell states") \ 867 \ 868 develop(bool, TimeOopMap, false, \ 869 "Time calls to GenerateOopMap::compute_map() in sum") \ 870 \ 871 develop(bool, TimeOopMap2, false, \ 872 "Time calls to GenerateOopMap::compute_map() individually") \ 873 \ 874 develop(bool, TraceOopMapRewrites, false, \ 875 "Trace rewriting of method oops during oop map generation") \ 876 \ 877 develop(bool, TraceICBuffer, false, \ 878 "Trace usage of IC buffer") \ 879 \ 880 develop(bool, TraceCompiledIC, false, \ 881 "Trace changes of compiled IC") \ 882 \ 883 develop(bool, FLSVerifyDictionary, false, \ 884 "Do lots of (expensive) FLS dictionary verification") \ 885 \ 886 \ 887 notproduct(bool, CheckMemoryInitialization, false, \ 888 "Check memory initialization") \ 889 \ 890 product(uintx, ProcessDistributionStride, 4, \ 891 "Stride through processors when distributing processes") \ 892 range(0, max_juint) \ 893 \ 894 develop(bool, TraceFinalizerRegistration, false, \ 895 "Trace registration of final references") \ 896 \ 897 product(bool, IgnoreEmptyClassPaths, false, \ 898 "Ignore empty path elements in -classpath") \ 899 \ 900 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 901 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 902 "(Deprecated) Initial size of the boot class loader data metaspace") \ 903 range(30*K, max_uintx/BytesPerWord) \ 904 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 905 \ 906 product(bool, PrintHeapAtSIGBREAK, true, \ 907 "Print heap layout in response to SIGBREAK") \ 908 \ 909 manageable(bool, PrintClassHistogram, false, \ 910 "Print a histogram of class instances") \ 911 \ 912 experimental(double, ObjectCountCutOffPercent, 0.5, \ 913 "The percentage of the used heap that the instances of a class " \ 914 "must occupy for the class to generate a trace event") \ 915 range(0.0, 100.0) \ 916 \ 917 /* JVMTI heap profiling */ \ 918 \ 919 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 920 "Trace JVMTI object tagging calls") \ 921 \ 922 diagnostic(bool, VerifyBeforeIteration, false, \ 923 "Verify memory system before JVMTI iteration") \ 924 \ 925 /* compiler interface */ \ 926 \ 927 develop(bool, CIPrintCompilerName, false, \ 928 "when CIPrint is active, print the name of the active compiler") \ 929 \ 930 diagnostic(bool, CIPrintCompileQueue, false, \ 931 "display the contents of the compile queue whenever a " \ 932 "compilation is enqueued") \ 933 \ 934 develop(bool, CIPrintRequests, false, \ 935 "display every request for compilation") \ 936 \ 937 product(bool, CITime, false, \ 938 "collect timing information for compilation") \ 939 \ 940 develop(bool, CITimeVerbose, false, \ 941 "be more verbose in compilation timings") \ 942 \ 943 develop(bool, CITimeEach, false, \ 944 "display timing information after each successful compilation") \ 945 \ 946 develop(bool, CICountOSR, false, \ 947 "use a separate counter when assigning ids to osr compilations") \ 948 \ 949 develop(bool, CICompileNatives, true, \ 950 "compile native methods if supported by the compiler") \ 951 \ 952 develop_pd(bool, CICompileOSR, \ 953 "compile on stack replacement methods if supported by the " \ 954 "compiler") \ 955 \ 956 develop(bool, CIPrintMethodCodes, false, \ 957 "print method bytecodes of the compiled code") \ 958 \ 959 develop(bool, CIPrintTypeFlow, false, \ 960 "print the results of ciTypeFlow analysis") \ 961 \ 962 develop(bool, CITraceTypeFlow, false, \ 963 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 964 \ 965 develop(intx, OSROnlyBCI, -1, \ 966 "OSR only at this bci. Negative values mean exclude that bci") \ 967 \ 968 /* compiler */ \ 969 \ 970 /* notice: the max range value here is max_jint, not max_intx */ \ 971 /* because of overflow issue */ \ 972 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 973 "Number of compiler threads to run") \ 974 range(0, max_jint) \ 975 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 976 \ 977 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 978 "Dynamically choose the number of parallel compiler threads") \ 979 \ 980 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 981 "Reduce the number of parallel compiler threads when they " \ 982 "are not used") \ 983 \ 984 diagnostic(bool, TraceCompilerThreads, false, \ 985 "Trace creation and removal of compiler threads") \ 986 \ 987 develop(bool, InjectCompilerCreationFailure, false, \ 988 "Inject thread creation failures for " \ 989 "UseDynamicNumberOfCompilerThreads") \ 990 \ 991 develop(bool, UseStackBanging, true, \ 992 "use stack banging for stack overflow checks (required for " \ 993 "proper StackOverflow handling; disable only to measure cost " \ 994 "of stackbanging)") \ 995 \ 996 develop(bool, GenerateSynchronizationCode, true, \ 997 "generate locking/unlocking code for synchronized methods and " \ 998 "monitors") \ 999 \ 1000 develop(bool, GenerateRangeChecks, true, \ 1001 "Generate range checks for array accesses") \ 1002 \ 1003 diagnostic_pd(bool, ImplicitNullChecks, \ 1004 "Generate code for implicit null checks") \ 1005 \ 1006 product_pd(bool, TrapBasedNullChecks, \ 1007 "Generate code for null checks that uses a cmp and trap " \ 1008 "instruction raising SIGTRAP. This is only used if an access to" \ 1009 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1010 "ImplicitNullChecks don't work (PPC64).") \ 1011 \ 1012 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1013 "Enable Thread SMR extra validity checks") \ 1014 \ 1015 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1016 "Enable Thread SMR Statistics") \ 1017 \ 1018 product(bool, UseNotificationThread, true, \ 1019 "Use Notification Thread") \ 1020 \ 1021 product(bool, Inline, true, \ 1022 "Enable inlining") \ 1023 \ 1024 product(bool, ClipInlining, true, \ 1025 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1026 \ 1027 develop(bool, UseCHA, true, \ 1028 "Enable CHA") \ 1029 \ 1030 product(bool, UseTypeProfile, true, \ 1031 "Check interpreter profile for historically monomorphic calls") \ 1032 \ 1033 diagnostic(bool, PrintInlining, false, \ 1034 "Print inlining optimizations") \ 1035 \ 1036 product(bool, UsePopCountInstruction, false, \ 1037 "Use population count instruction") \ 1038 \ 1039 develop(bool, EagerInitialization, false, \ 1040 "Eagerly initialize classes if possible") \ 1041 \ 1042 diagnostic(bool, LogTouchedMethods, false, \ 1043 "Log methods which have been ever touched in runtime") \ 1044 \ 1045 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1046 "Print all methods that have been ever touched in runtime") \ 1047 \ 1048 develop(bool, TraceMethodReplacement, false, \ 1049 "Print when methods are replaced do to recompilation") \ 1050 \ 1051 develop(bool, PrintMethodFlushing, false, \ 1052 "Print the nmethods being flushed") \ 1053 \ 1054 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1055 "print statistics about method flushing") \ 1056 \ 1057 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1058 "Number of compiled code invocations after which " \ 1059 "the method is considered as hot by the flusher") \ 1060 range(1, max_jint) \ 1061 \ 1062 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1063 "Minimum number of sweeper passes before an nmethod " \ 1064 "can be flushed") \ 1065 range(0, max_intx) \ 1066 \ 1067 product(bool, UseCodeAging, true, \ 1068 "Insert counter to detect warm methods") \ 1069 \ 1070 diagnostic(bool, StressCodeAging, false, \ 1071 "Start with counters compiled in") \ 1072 \ 1073 develop(bool, StressCodeBuffers, false, \ 1074 "Exercise code buffer expansion and other rare state changes") \ 1075 \ 1076 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1077 "Generate extra debugging information for non-safepoints in " \ 1078 "nmethods") \ 1079 \ 1080 product(bool, PrintVMOptions, false, \ 1081 "Print flags that appeared on the command line") \ 1082 \ 1083 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1084 "Ignore unrecognized VM options") \ 1085 \ 1086 product(bool, PrintCommandLineFlags, false, \ 1087 "Print flags specified on command line or set by ergonomics") \ 1088 \ 1089 product(bool, PrintFlagsInitial, false, \ 1090 "Print all VM flags before argument processing and exit VM") \ 1091 \ 1092 product(bool, PrintFlagsFinal, false, \ 1093 "Print all VM flags after argument and ergonomic processing") \ 1094 \ 1095 notproduct(bool, PrintFlagsWithComments, false, \ 1096 "Print all VM flags with default values and descriptions and " \ 1097 "exit") \ 1098 \ 1099 product(bool, PrintFlagsRanges, false, \ 1100 "Print VM flags and their ranges") \ 1101 \ 1102 diagnostic(bool, SerializeVMOutput, true, \ 1103 "Use a mutex to serialize output to tty and LogFile") \ 1104 \ 1105 diagnostic(bool, DisplayVMOutput, true, \ 1106 "Display all VM output on the tty, independently of LogVMOutput") \ 1107 \ 1108 diagnostic(bool, LogVMOutput, false, \ 1109 "Save VM output to LogFile") \ 1110 \ 1111 diagnostic(ccstr, LogFile, NULL, \ 1112 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1113 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1114 \ 1115 product(ccstr, ErrorFile, NULL, \ 1116 "If an error occurs, save the error data to this file " \ 1117 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1118 \ 1119 product(bool, ExtensiveErrorReports, \ 1120 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1121 "Error reports are more extensive.") \ 1122 \ 1123 product(bool, DisplayVMOutputToStderr, false, \ 1124 "If DisplayVMOutput is true, display all VM output to stderr") \ 1125 \ 1126 product(bool, DisplayVMOutputToStdout, false, \ 1127 "If DisplayVMOutput is true, display all VM output to stdout") \ 1128 \ 1129 product(bool, ErrorFileToStderr, false, \ 1130 "If true, error data is printed to stderr instead of a file") \ 1131 \ 1132 product(bool, ErrorFileToStdout, false, \ 1133 "If true, error data is printed to stdout instead of a file") \ 1134 \ 1135 product(bool, UseHeavyMonitors, false, \ 1136 "use heavyweight instead of lightweight Java monitors") \ 1137 \ 1138 product(bool, PrintStringTableStatistics, false, \ 1139 "print statistics about the StringTable and SymbolTable") \ 1140 \ 1141 diagnostic(bool, VerifyStringTableAtExit, false, \ 1142 "verify StringTable contents at exit") \ 1143 \ 1144 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1145 "print histogram of the symbol table") \ 1146 \ 1147 notproduct(bool, ExitVMOnVerifyError, false, \ 1148 "standard exit from VM if bytecode verify error " \ 1149 "(only in debug mode)") \ 1150 \ 1151 diagnostic(ccstr, AbortVMOnException, NULL, \ 1152 "Call fatal if this exception is thrown. Example: " \ 1153 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1154 \ 1155 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1156 "Call fatal if the exception pointed by AbortVMOnException " \ 1157 "has this message") \ 1158 \ 1159 develop(bool, DebugVtables, false, \ 1160 "add debugging code to vtable dispatch") \ 1161 \ 1162 notproduct(bool, PrintVtableStats, false, \ 1163 "print vtables stats at end of run") \ 1164 \ 1165 develop(bool, TraceCreateZombies, false, \ 1166 "trace creation of zombie nmethods") \ 1167 \ 1168 product(bool, RangeCheckElimination, true, \ 1169 "Eliminate range checks") \ 1170 \ 1171 develop_pd(bool, UncommonNullCast, \ 1172 "track occurrences of null in casts; adjust compiler tactics") \ 1173 \ 1174 develop(bool, TypeProfileCasts, true, \ 1175 "treat casts like calls for purposes of type profiling") \ 1176 \ 1177 develop(bool, TraceLivenessGen, false, \ 1178 "Trace the generation of liveness analysis information") \ 1179 \ 1180 notproduct(bool, TraceLivenessQuery, false, \ 1181 "Trace queries of liveness analysis information") \ 1182 \ 1183 notproduct(bool, CollectIndexSetStatistics, false, \ 1184 "Collect information about IndexSets") \ 1185 \ 1186 develop(bool, UseLoopSafepoints, true, \ 1187 "Generate Safepoint nodes in every loop") \ 1188 \ 1189 develop(intx, FastAllocateSizeLimit, 128*K, \ 1190 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1191 "Inline allocations larger than this in doublewords must go slow")\ 1192 \ 1193 product_pd(bool, CompactStrings, \ 1194 "Enable Strings to use single byte chars in backing store") \ 1195 \ 1196 product_pd(uintx, TypeProfileLevel, \ 1197 "=XYZ, with Z: Type profiling of arguments at call; " \ 1198 "Y: Type profiling of return value at call; " \ 1199 "X: Type profiling of parameters to methods; " \ 1200 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1201 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1202 \ 1203 product(intx, TypeProfileArgsLimit, 2, \ 1204 "max number of call arguments to consider for type profiling") \ 1205 range(0, 16) \ 1206 \ 1207 product(intx, TypeProfileParmsLimit, 2, \ 1208 "max number of incoming parameters to consider for type profiling"\ 1209 ", -1 for all") \ 1210 range(-1, 64) \ 1211 \ 1212 /* statistics */ \ 1213 develop(bool, CountCompiledCalls, false, \ 1214 "Count method invocations") \ 1215 \ 1216 notproduct(bool, CountRuntimeCalls, false, \ 1217 "Count VM runtime calls") \ 1218 \ 1219 develop(bool, CountJNICalls, false, \ 1220 "Count jni method invocations") \ 1221 \ 1222 notproduct(bool, CountJVMCalls, false, \ 1223 "Count jvm method invocations") \ 1224 \ 1225 notproduct(bool, CountRemovableExceptions, false, \ 1226 "Count exceptions that could be replaced by branches due to " \ 1227 "inlining") \ 1228 \ 1229 notproduct(bool, ICMissHistogram, false, \ 1230 "Produce histogram of IC misses") \ 1231 \ 1232 /* interpreter */ \ 1233 product_pd(bool, RewriteBytecodes, \ 1234 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1235 \ 1236 product_pd(bool, RewriteFrequentPairs, \ 1237 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1238 \ 1239 diagnostic(bool, PrintInterpreter, false, \ 1240 "Print the generated interpreter code") \ 1241 \ 1242 product(bool, UseInterpreter, true, \ 1243 "Use interpreter for non-compiled methods") \ 1244 \ 1245 develop(bool, UseFastSignatureHandlers, true, \ 1246 "Use fast signature handlers for native calls") \ 1247 \ 1248 product(bool, UseLoopCounter, true, \ 1249 "Increment invocation counter on backward branch") \ 1250 \ 1251 product_pd(bool, UseOnStackReplacement, \ 1252 "Use on stack replacement, calls runtime if invoc. counter " \ 1253 "overflows in loop") \ 1254 \ 1255 notproduct(bool, TraceOnStackReplacement, false, \ 1256 "Trace on stack replacement") \ 1257 \ 1258 product_pd(bool, PreferInterpreterNativeStubs, \ 1259 "Use always interpreter stubs for native methods invoked via " \ 1260 "interpreter") \ 1261 \ 1262 develop(bool, CountBytecodes, false, \ 1263 "Count number of bytecodes executed") \ 1264 \ 1265 develop(bool, PrintBytecodeHistogram, false, \ 1266 "Print histogram of the executed bytecodes") \ 1267 \ 1268 develop(bool, PrintBytecodePairHistogram, false, \ 1269 "Print histogram of the executed bytecode pairs") \ 1270 \ 1271 diagnostic(bool, PrintSignatureHandlers, false, \ 1272 "Print code generated for native method signature handlers") \ 1273 \ 1274 develop(bool, VerifyOops, false, \ 1275 "Do plausibility checks for oops") \ 1276 \ 1277 develop(bool, CheckUnhandledOops, false, \ 1278 "Check for unhandled oops in VM code") \ 1279 \ 1280 develop(bool, VerifyJNIFields, trueInDebug, \ 1281 "Verify jfieldIDs for instance fields") \ 1282 \ 1283 notproduct(bool, VerifyJNIEnvThread, false, \ 1284 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1285 "from JNI") \ 1286 \ 1287 develop(bool, VerifyFPU, false, \ 1288 "Verify FPU state (check for NaN's, etc.)") \ 1289 \ 1290 develop(bool, VerifyThread, false, \ 1291 "Watch the thread register for corruption (SPARC only)") \ 1292 \ 1293 develop(bool, VerifyActivationFrameSize, false, \ 1294 "Verify that activation frame didn't become smaller than its " \ 1295 "minimal size") \ 1296 \ 1297 develop(bool, TraceFrequencyInlining, false, \ 1298 "Trace frequency based inlining") \ 1299 \ 1300 develop_pd(bool, InlineIntrinsics, \ 1301 "Inline intrinsics that can be statically resolved") \ 1302 \ 1303 product_pd(bool, ProfileInterpreter, \ 1304 "Profile at the bytecode level during interpretation") \ 1305 \ 1306 develop(bool, TraceProfileInterpreter, false, \ 1307 "Trace profiling at the bytecode level during interpretation. " \ 1308 "This outputs the profiling information collected to improve " \ 1309 "jit compilation.") \ 1310 \ 1311 develop_pd(bool, ProfileTraps, \ 1312 "Profile deoptimization traps at the bytecode level") \ 1313 \ 1314 product(intx, ProfileMaturityPercentage, 20, \ 1315 "number of method invocations/branches (expressed as % of " \ 1316 "CompileThreshold) before using the method's profile") \ 1317 range(0, 100) \ 1318 \ 1319 diagnostic(bool, PrintMethodData, false, \ 1320 "Print the results of +ProfileInterpreter at end of run") \ 1321 \ 1322 develop(bool, VerifyDataPointer, trueInDebug, \ 1323 "Verify the method data pointer during interpreter profiling") \ 1324 \ 1325 develop(bool, VerifyCompiledCode, false, \ 1326 "Include miscellaneous runtime verifications in nmethod code; " \ 1327 "default off because it disturbs nmethod size heuristics") \ 1328 \ 1329 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1330 "Manually make GC thread crash then dump java stack trace; " \ 1331 "Test only") \ 1332 \ 1333 /* compilation */ \ 1334 product(bool, UseCompiler, true, \ 1335 "Use Just-In-Time compilation") \ 1336 \ 1337 product(bool, UseCounterDecay, true, \ 1338 "Adjust recompilation counters") \ 1339 \ 1340 develop(intx, CounterHalfLifeTime, 30, \ 1341 "Half-life time of invocation counters (in seconds)") \ 1342 \ 1343 develop(intx, CounterDecayMinIntervalLength, 500, \ 1344 "The minimum interval (in milliseconds) between invocation of " \ 1345 "CounterDecay") \ 1346 \ 1347 product(bool, AlwaysCompileLoopMethods, false, \ 1348 "When using recompilation, never interpret methods " \ 1349 "containing loops") \ 1350 \ 1351 product(bool, DontCompileHugeMethods, true, \ 1352 "Do not compile methods > HugeMethodLimit") \ 1353 \ 1354 /* Bytecode escape analysis estimation. */ \ 1355 product(bool, EstimateArgEscape, true, \ 1356 "Analyze bytecodes to estimate escape state of arguments") \ 1357 \ 1358 product(intx, BCEATraceLevel, 0, \ 1359 "How much tracing to do of bytecode escape analysis estimates " \ 1360 "(0-3)") \ 1361 range(0, 3) \ 1362 \ 1363 product(intx, MaxBCEAEstimateLevel, 5, \ 1364 "Maximum number of nested calls that are analyzed by BC EA") \ 1365 range(0, max_jint) \ 1366 \ 1367 product(intx, MaxBCEAEstimateSize, 150, \ 1368 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1369 range(0, max_jint) \ 1370 \ 1371 product(intx, AllocatePrefetchStyle, 1, \ 1372 "0 = no prefetch, " \ 1373 "1 = generate prefetch instructions for each allocation, " \ 1374 "2 = use TLAB watermark to gate allocation prefetch, " \ 1375 "3 = generate one prefetch instruction per cache line") \ 1376 range(0, 3) \ 1377 \ 1378 product(intx, AllocatePrefetchDistance, -1, \ 1379 "Distance to prefetch ahead of allocation pointer. " \ 1380 "-1: use system-specific value (automatically determined") \ 1381 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\ 1382 \ 1383 product(intx, AllocatePrefetchLines, 3, \ 1384 "Number of lines to prefetch ahead of array allocation pointer") \ 1385 range(1, 64) \ 1386 \ 1387 product(intx, AllocateInstancePrefetchLines, 1, \ 1388 "Number of lines to prefetch ahead of instance allocation " \ 1389 "pointer") \ 1390 range(1, 64) \ 1391 \ 1392 product(intx, AllocatePrefetchStepSize, 16, \ 1393 "Step size in bytes of sequential prefetch instructions") \ 1394 range(1, 512) \ 1395 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1396 \ 1397 product(intx, AllocatePrefetchInstr, 0, \ 1398 "Select instruction to prefetch ahead of allocation pointer") \ 1399 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1400 \ 1401 /* deoptimization */ \ 1402 develop(bool, TraceDeoptimization, false, \ 1403 "Trace deoptimization") \ 1404 \ 1405 develop(bool, PrintDeoptimizationDetails, false, \ 1406 "Print more information about deoptimization") \ 1407 \ 1408 develop(bool, DebugDeoptimization, false, \ 1409 "Tracing various information while debugging deoptimization") \ 1410 \ 1411 product(intx, SelfDestructTimer, 0, \ 1412 "Will cause VM to terminate after a given time (in minutes) " \ 1413 "(0 means off)") \ 1414 range(0, max_intx) \ 1415 \ 1416 product(intx, MaxJavaStackTraceDepth, 1024, \ 1417 "The maximum number of lines in the stack trace for Java " \ 1418 "exceptions (0 means all)") \ 1419 range(0, max_jint/2) \ 1420 \ 1421 /* notice: the max range value here is max_jint, not max_intx */ \ 1422 /* because of overflow issue */ \ 1423 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1424 "Guarantee a safepoint (at least) every so many milliseconds " \ 1425 "(0 means none)") \ 1426 range(0, max_jint) \ 1427 \ 1428 product(intx, SafepointTimeoutDelay, 10000, \ 1429 "Delay in milliseconds for option SafepointTimeout") \ 1430 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1431 NOT_LP64(range(0, max_intx)) \ 1432 \ 1433 product(intx, NmethodSweepActivity, 10, \ 1434 "Removes cold nmethods from code cache if > 0. Higher values " \ 1435 "result in more aggressive sweeping") \ 1436 range(0, 2000) \ 1437 \ 1438 notproduct(bool, LogSweeper, false, \ 1439 "Keep a ring buffer of sweeper activity") \ 1440 \ 1441 notproduct(intx, SweeperLogEntries, 1024, \ 1442 "Number of records in the ring buffer of sweeper activity") \ 1443 \ 1444 notproduct(intx, MemProfilingInterval, 500, \ 1445 "Time between each invocation of the MemProfiler") \ 1446 \ 1447 develop(intx, MallocCatchPtr, -1, \ 1448 "Hit breakpoint when mallocing/freeing this pointer") \ 1449 \ 1450 notproduct(ccstrlist, SuppressErrorAt, "", \ 1451 "List of assertions (file:line) to muzzle") \ 1452 \ 1453 develop(intx, StackPrintLimit, 100, \ 1454 "number of stack frames to print in VM-level stack dump") \ 1455 \ 1456 notproduct(intx, MaxElementPrintSize, 256, \ 1457 "maximum number of elements to print") \ 1458 \ 1459 notproduct(intx, MaxSubklassPrintSize, 4, \ 1460 "maximum number of subklasses to print when printing klass") \ 1461 \ 1462 develop(intx, MaxForceInlineLevel, 100, \ 1463 "maximum number of nested calls that are forced for inlining " \ 1464 "(using CompileCommand or marked w/ @ForceInline)") \ 1465 range(0, max_jint) \ 1466 \ 1467 product(intx, MinInliningThreshold, 250, \ 1468 "The minimum invocation count a method needs to have to be " \ 1469 "inlined") \ 1470 range(0, max_jint) \ 1471 \ 1472 develop(intx, MethodHistogramCutoff, 100, \ 1473 "The cutoff value for method invocation histogram (+CountCalls)") \ 1474 \ 1475 develop(intx, DontYieldALotInterval, 10, \ 1476 "Interval between which yields will be dropped (milliseconds)") \ 1477 \ 1478 notproduct(intx, DeoptimizeALotInterval, 5, \ 1479 "Number of exits until DeoptimizeALot kicks in") \ 1480 \ 1481 notproduct(intx, ZombieALotInterval, 5, \ 1482 "Number of exits until ZombieALot kicks in") \ 1483 \ 1484 diagnostic(uintx, MallocMaxTestWords, 0, \ 1485 "If non-zero, maximum number of words that malloc/realloc can " \ 1486 "allocate (for testing only)") \ 1487 range(0, max_uintx) \ 1488 \ 1489 product(intx, TypeProfileWidth, 2, \ 1490 "Number of receiver types to record in call/cast profile") \ 1491 range(0, 8) \ 1492 \ 1493 develop(intx, BciProfileWidth, 2, \ 1494 "Number of return bci's to record in ret profile") \ 1495 \ 1496 product(intx, PerMethodRecompilationCutoff, 400, \ 1497 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1498 range(-1, max_intx) \ 1499 \ 1500 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1501 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1502 range(-1, max_intx) \ 1503 \ 1504 product(intx, PerMethodTrapLimit, 100, \ 1505 "Limit on traps (of one kind) in a method (includes inlines)") \ 1506 range(0, max_jint) \ 1507 \ 1508 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1509 "Limit on speculative traps (of one kind) in a method " \ 1510 "(includes inlines)") \ 1511 range(0, max_jint) \ 1512 \ 1513 product(intx, PerBytecodeTrapLimit, 4, \ 1514 "Limit on traps (of one kind) at a particular BCI") \ 1515 range(0, max_jint) \ 1516 \ 1517 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1518 "Extra method data trap entries for speculation") \ 1519 \ 1520 develop(intx, InlineFrequencyRatio, 20, \ 1521 "Ratio of call site execution to caller method invocation") \ 1522 range(0, max_jint) \ 1523 \ 1524 diagnostic_pd(intx, InlineFrequencyCount, \ 1525 "Count of call site execution necessary to trigger frequent " \ 1526 "inlining") \ 1527 range(0, max_jint) \ 1528 \ 1529 develop(intx, InlineThrowCount, 50, \ 1530 "Force inlining of interpreted methods that throw this often") \ 1531 range(0, max_jint) \ 1532 \ 1533 develop(intx, InlineThrowMaxSize, 200, \ 1534 "Force inlining of throwing methods smaller than this") \ 1535 range(0, max_jint) \ 1536 \ 1537 develop(intx, ProfilerNodeSize, 1024, \ 1538 "Size in K to allocate for the Profile Nodes of each thread") \ 1539 range(0, 1024) \ 1540 \ 1541 product_pd(size_t, MetaspaceSize, \ 1542 "Initial threshold (in bytes) at which a garbage collection " \ 1543 "is done to reduce Metaspace usage") \ 1544 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1545 \ 1546 product(size_t, MaxMetaspaceSize, max_uintx, \ 1547 "Maximum size of Metaspaces (in bytes)") \ 1548 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1549 \ 1550 product(size_t, CompressedClassSpaceSize, 1*G, \ 1551 "Maximum size of class area in Metaspace when compressed " \ 1552 "class pointers are used") \ 1553 range(1*M, 3*G) \ 1554 \ 1555 manageable(uintx, MinHeapFreeRatio, 40, \ 1556 "The minimum percentage of heap free after GC to avoid expansion."\ 1557 " For most GCs this applies to the old generation. In G1 and" \ 1558 " ParallelGC it applies to the whole heap.") \ 1559 range(0, 100) \ 1560 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1561 \ 1562 manageable(uintx, MaxHeapFreeRatio, 70, \ 1563 "The maximum percentage of heap free after GC to avoid shrinking."\ 1564 " For most GCs this applies to the old generation. In G1 and" \ 1565 " ParallelGC it applies to the whole heap.") \ 1566 range(0, 100) \ 1567 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1568 \ 1569 product(bool, ShrinkHeapInSteps, true, \ 1570 "When disabled, informs the GC to shrink the java heap directly" \ 1571 " to the target size at the next full GC rather than requiring" \ 1572 " smaller steps during multiple full GCs.") \ 1573 \ 1574 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1575 "Number of milliseconds per MB of free space in the heap") \ 1576 range(0, max_intx) \ 1577 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1578 \ 1579 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1580 "The minimum change in heap space due to GC (in bytes)") \ 1581 range(0, max_uintx) \ 1582 \ 1583 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1584 "The minimum expansion of Metaspace (in bytes)") \ 1585 range(0, max_uintx) \ 1586 \ 1587 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1588 "The maximum percentage of Metaspace free after GC to avoid " \ 1589 "shrinking") \ 1590 range(0, 100) \ 1591 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1592 \ 1593 product(uintx, MinMetaspaceFreeRatio, 40, \ 1594 "The minimum percentage of Metaspace free after GC to avoid " \ 1595 "expansion") \ 1596 range(0, 99) \ 1597 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1598 \ 1599 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1600 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1601 range(0, max_uintx) \ 1602 \ 1603 /* stack parameters */ \ 1604 product_pd(intx, StackYellowPages, \ 1605 "Number of yellow zone (recoverable overflows) pages of size " \ 1606 "4KB. If pages are bigger yellow zone is aligned up.") \ 1607 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1608 \ 1609 product_pd(intx, StackRedPages, \ 1610 "Number of red zone (unrecoverable overflows) pages of size " \ 1611 "4KB. If pages are bigger red zone is aligned up.") \ 1612 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1613 \ 1614 product_pd(intx, StackReservedPages, \ 1615 "Number of reserved zone (reserved to annotated methods) pages" \ 1616 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1617 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1618 \ 1619 product(bool, RestrictReservedStack, true, \ 1620 "Restrict @ReservedStackAccess to trusted classes") \ 1621 \ 1622 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1623 product_pd(intx, StackShadowPages, \ 1624 "Number of shadow zone (for overflow checking) pages of size " \ 1625 "4KB. If pages are bigger shadow zone is aligned up. " \ 1626 "This should exceed the depth of the VM and native call stack.") \ 1627 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1628 \ 1629 product_pd(intx, ThreadStackSize, \ 1630 "Thread Stack Size (in Kbytes)") \ 1631 range(0, 1 * M) \ 1632 \ 1633 product_pd(intx, VMThreadStackSize, \ 1634 "Non-Java Thread Stack Size (in Kbytes)") \ 1635 range(0, max_intx/(1 * K)) \ 1636 \ 1637 product_pd(intx, CompilerThreadStackSize, \ 1638 "Compiler Thread Stack Size (in Kbytes)") \ 1639 range(0, max_intx/(1 * K)) \ 1640 \ 1641 develop_pd(size_t, JVMInvokeMethodSlack, \ 1642 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1643 \ 1644 /* code cache parameters */ \ 1645 develop_pd(uintx, CodeCacheSegmentSize, \ 1646 "Code cache segment size (in bytes) - smallest unit of " \ 1647 "allocation") \ 1648 range(1, 1024) \ 1649 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1650 \ 1651 develop_pd(intx, CodeEntryAlignment, \ 1652 "Code entry alignment for generated code (in bytes)") \ 1653 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1654 \ 1655 product_pd(intx, OptoLoopAlignment, \ 1656 "Align inner loops to zero relative to this modulus") \ 1657 range(1, 16) \ 1658 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1659 \ 1660 product_pd(uintx, InitialCodeCacheSize, \ 1661 "Initial code cache size (in bytes)") \ 1662 range(os::vm_page_size(), max_uintx) \ 1663 \ 1664 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1665 "Minimum code cache size (in bytes) required to start VM.") \ 1666 range(0, max_uintx) \ 1667 \ 1668 product(bool, SegmentedCodeCache, false, \ 1669 "Use a segmented code cache") \ 1670 \ 1671 product_pd(uintx, ReservedCodeCacheSize, \ 1672 "Reserved code cache size (in bytes) - maximum code cache size") \ 1673 range(os::vm_page_size(), max_uintx) \ 1674 \ 1675 product_pd(uintx, NonProfiledCodeHeapSize, \ 1676 "Size of code heap with non-profiled methods (in bytes)") \ 1677 range(0, max_uintx) \ 1678 \ 1679 product_pd(uintx, ProfiledCodeHeapSize, \ 1680 "Size of code heap with profiled methods (in bytes)") \ 1681 range(0, max_uintx) \ 1682 \ 1683 product_pd(uintx, NonNMethodCodeHeapSize, \ 1684 "Size of code heap with non-nmethods (in bytes)") \ 1685 range(os::vm_page_size(), max_uintx) \ 1686 \ 1687 product_pd(uintx, CodeCacheExpansionSize, \ 1688 "Code cache expansion size (in bytes)") \ 1689 range(32*K, max_uintx) \ 1690 \ 1691 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1692 "Minimum number of segments in a code cache block") \ 1693 range(1, 100) \ 1694 \ 1695 notproduct(bool, ExitOnFullCodeCache, false, \ 1696 "Exit the VM if we fill the code cache") \ 1697 \ 1698 product(bool, UseCodeCacheFlushing, true, \ 1699 "Remove cold/old nmethods from the code cache") \ 1700 \ 1701 product(double, SweeperThreshold, 0.5, \ 1702 "Threshold controlling when code cache sweeper is invoked." \ 1703 "Value is percentage of ReservedCodeCacheSize.") \ 1704 range(0.0, 100.0) \ 1705 \ 1706 product(uintx, StartAggressiveSweepingAt, 10, \ 1707 "Start aggressive sweeping if X[%] of the code cache is free." \ 1708 "Segmented code cache: X[%] of the non-profiled heap." \ 1709 "Non-segmented code cache: X[%] of the total code cache") \ 1710 range(0, 100) \ 1711 \ 1712 /* AOT parameters */ \ 1713 experimental(bool, UseAOT, false, \ 1714 "Use AOT compiled files") \ 1715 \ 1716 experimental(ccstrlist, AOTLibrary, NULL, \ 1717 "AOT library") \ 1718 \ 1719 experimental(bool, PrintAOT, false, \ 1720 "Print used AOT klasses and methods") \ 1721 \ 1722 notproduct(bool, PrintAOTStatistics, false, \ 1723 "Print AOT statistics") \ 1724 \ 1725 diagnostic(bool, UseAOTStrictLoading, false, \ 1726 "Exit the VM if any of the AOT libraries has invalid config") \ 1727 \ 1728 product(bool, CalculateClassFingerprint, false, \ 1729 "Calculate class fingerprint") \ 1730 \ 1731 /* interpreter debugging */ \ 1732 develop(intx, BinarySwitchThreshold, 5, \ 1733 "Minimal number of lookupswitch entries for rewriting to binary " \ 1734 "switch") \ 1735 \ 1736 develop(intx, StopInterpreterAt, 0, \ 1737 "Stop interpreter execution at specified bytecode number") \ 1738 \ 1739 develop(intx, TraceBytecodesAt, 0, \ 1740 "Trace bytecodes starting with specified bytecode number") \ 1741 \ 1742 /* compiler interface */ \ 1743 develop(intx, CIStart, 0, \ 1744 "The id of the first compilation to permit") \ 1745 \ 1746 develop(intx, CIStop, max_jint, \ 1747 "The id of the last compilation to permit") \ 1748 \ 1749 develop(intx, CIStartOSR, 0, \ 1750 "The id of the first osr compilation to permit " \ 1751 "(CICountOSR must be on)") \ 1752 \ 1753 develop(intx, CIStopOSR, max_jint, \ 1754 "The id of the last osr compilation to permit " \ 1755 "(CICountOSR must be on)") \ 1756 \ 1757 develop(intx, CIBreakAtOSR, -1, \ 1758 "The id of osr compilation to break at") \ 1759 \ 1760 develop(intx, CIBreakAt, -1, \ 1761 "The id of compilation to break at") \ 1762 \ 1763 product(ccstrlist, CompileOnly, "", \ 1764 "List of methods (pkg/class.name) to restrict compilation to") \ 1765 \ 1766 product(ccstr, CompileCommandFile, NULL, \ 1767 "Read compiler commands from this file [.hotspot_compiler]") \ 1768 \ 1769 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1770 "Read compiler directives from this file") \ 1771 \ 1772 product(ccstrlist, CompileCommand, "", \ 1773 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1774 \ 1775 develop(bool, ReplayCompiles, false, \ 1776 "Enable replay of compilations from ReplayDataFile") \ 1777 \ 1778 product(ccstr, ReplayDataFile, NULL, \ 1779 "File containing compilation replay information" \ 1780 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1781 \ 1782 product(ccstr, InlineDataFile, NULL, \ 1783 "File containing inlining replay information" \ 1784 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1785 \ 1786 develop(intx, ReplaySuppressInitializers, 2, \ 1787 "Control handling of class initialization during replay: " \ 1788 "0 - don't do anything special; " \ 1789 "1 - treat all class initializers as empty; " \ 1790 "2 - treat class initializers for application classes as empty; " \ 1791 "3 - allow all class initializers to run during bootstrap but " \ 1792 " pretend they are empty after starting replay") \ 1793 range(0, 3) \ 1794 \ 1795 develop(bool, ReplayIgnoreInitErrors, false, \ 1796 "Ignore exceptions thrown during initialization for replay") \ 1797 \ 1798 product(bool, DumpReplayDataOnError, true, \ 1799 "Record replay data for crashing compiler threads") \ 1800 \ 1801 product(bool, CICompilerCountPerCPU, false, \ 1802 "1 compiler thread for log(N CPUs)") \ 1803 \ 1804 notproduct(intx, CICrashAt, -1, \ 1805 "id of compilation to trigger assert in compiler thread for " \ 1806 "the purpose of testing, e.g. generation of replay data") \ 1807 notproduct(bool, CIObjectFactoryVerify, false, \ 1808 "enable potentially expensive verification in ciObjectFactory") \ 1809 \ 1810 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1811 "Abort VM when method had failed to compile.") \ 1812 \ 1813 /* Priorities */ \ 1814 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1815 \ 1816 product(intx, ThreadPriorityPolicy, 0, \ 1817 "0 : Normal. "\ 1818 " VM chooses priorities that are appropriate for normal "\ 1819 " applications. "\ 1820 " On Windows applications are allowed to use higher native "\ 1821 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1822 " not use the highest possible native priority, "\ 1823 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1824 " system threads. On Linux thread priorities are ignored "\ 1825 " because the OS does not support static priority in "\ 1826 " SCHED_OTHER scheduling class which is the only choice for "\ 1827 " non-root, non-realtime applications. "\ 1828 "1 : Aggressive. "\ 1829 " Java thread priorities map over to the entire range of "\ 1830 " native thread priorities. Higher Java thread priorities map "\ 1831 " to higher native thread priorities. This policy should be "\ 1832 " used with care, as sometimes it can cause performance "\ 1833 " degradation in the application and/or the entire system. On "\ 1834 " Linux/BSD/macOS this policy requires root privilege or an "\ 1835 " extended capability.") \ 1836 range(0, 1) \ 1837 \ 1838 product(bool, ThreadPriorityVerbose, false, \ 1839 "Print priority changes") \ 1840 \ 1841 product(intx, CompilerThreadPriority, -1, \ 1842 "The native priority at which compiler threads should run " \ 1843 "(-1 means no change)") \ 1844 range(min_jint, max_jint) \ 1845 \ 1846 product(intx, VMThreadPriority, -1, \ 1847 "The native priority at which the VM thread should run " \ 1848 "(-1 means no change)") \ 1849 range(-1, 127) \ 1850 \ 1851 product(intx, JavaPriority1_To_OSPriority, -1, \ 1852 "Map Java priorities to OS priorities") \ 1853 range(-1, 127) \ 1854 \ 1855 product(intx, JavaPriority2_To_OSPriority, -1, \ 1856 "Map Java priorities to OS priorities") \ 1857 range(-1, 127) \ 1858 \ 1859 product(intx, JavaPriority3_To_OSPriority, -1, \ 1860 "Map Java priorities to OS priorities") \ 1861 range(-1, 127) \ 1862 \ 1863 product(intx, JavaPriority4_To_OSPriority, -1, \ 1864 "Map Java priorities to OS priorities") \ 1865 range(-1, 127) \ 1866 \ 1867 product(intx, JavaPriority5_To_OSPriority, -1, \ 1868 "Map Java priorities to OS priorities") \ 1869 range(-1, 127) \ 1870 \ 1871 product(intx, JavaPriority6_To_OSPriority, -1, \ 1872 "Map Java priorities to OS priorities") \ 1873 range(-1, 127) \ 1874 \ 1875 product(intx, JavaPriority7_To_OSPriority, -1, \ 1876 "Map Java priorities to OS priorities") \ 1877 range(-1, 127) \ 1878 \ 1879 product(intx, JavaPriority8_To_OSPriority, -1, \ 1880 "Map Java priorities to OS priorities") \ 1881 range(-1, 127) \ 1882 \ 1883 product(intx, JavaPriority9_To_OSPriority, -1, \ 1884 "Map Java priorities to OS priorities") \ 1885 range(-1, 127) \ 1886 \ 1887 product(intx, JavaPriority10_To_OSPriority,-1, \ 1888 "Map Java priorities to OS priorities") \ 1889 range(-1, 127) \ 1890 \ 1891 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1892 "Java thread priority 10 maps to critical scheduling priority") \ 1893 \ 1894 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1895 "Compiler thread(s) run at critical scheduling priority") \ 1896 \ 1897 develop(intx, NewCodeParameter, 0, \ 1898 "Testing Only: Create a dedicated integer parameter before " \ 1899 "putback") \ 1900 \ 1901 /* new oopmap storage allocation */ \ 1902 develop(intx, MinOopMapAllocation, 8, \ 1903 "Minimum number of OopMap entries in an OopMapSet") \ 1904 \ 1905 /* Background Compilation */ \ 1906 develop(intx, LongCompileThreshold, 50, \ 1907 "Used with +TraceLongCompiles") \ 1908 \ 1909 /* recompilation */ \ 1910 product_pd(intx, CompileThreshold, \ 1911 "number of interpreted method invocations before (re-)compiling") \ 1912 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1913 \ 1914 product(double, CompileThresholdScaling, 1.0, \ 1915 "Factor to control when first compilation happens " \ 1916 "(both with and without tiered compilation): " \ 1917 "values greater than 1.0 delay counter overflow, " \ 1918 "values between 0 and 1.0 rush counter overflow, " \ 1919 "value of 1.0 leaves compilation thresholds unchanged " \ 1920 "value of 0.0 is equivalent to -Xint. " \ 1921 "" \ 1922 "Flag can be set as per-method option. " \ 1923 "If a value is specified for a method, compilation thresholds " \ 1924 "for that method are scaled by both the value of the global flag "\ 1925 "and the value of the per-method flag.") \ 1926 range(0.0, DBL_MAX) \ 1927 \ 1928 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1929 "Interpreter (tier 0) invocation notification frequency") \ 1930 range(0, 30) \ 1931 \ 1932 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 1933 "C1 without MDO (tier 2) invocation notification frequency") \ 1934 range(0, 30) \ 1935 \ 1936 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 1937 "C1 with MDO profiling (tier 3) invocation notification " \ 1938 "frequency") \ 1939 range(0, 30) \ 1940 \ 1941 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 1942 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 1943 range(0, 30) \ 1944 \ 1945 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 1946 "Interpreter (tier 0) invocation notification frequency") \ 1947 range(0, 30) \ 1948 \ 1949 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 1950 "C1 without MDO (tier 2) invocation notification frequency") \ 1951 range(0, 30) \ 1952 \ 1953 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 1954 "C1 with MDO profiling (tier 3) invocation notification " \ 1955 "frequency") \ 1956 range(0, 30) \ 1957 \ 1958 product(intx, Tier2CompileThreshold, 0, \ 1959 "threshold at which tier 2 compilation is invoked") \ 1960 range(0, max_jint) \ 1961 \ 1962 product(intx, Tier2BackEdgeThreshold, 0, \ 1963 "Back edge threshold at which tier 2 compilation is invoked") \ 1964 range(0, max_jint) \ 1965 \ 1966 product(intx, Tier3InvocationThreshold, 200, \ 1967 "Compile if number of method invocations crosses this " \ 1968 "threshold") \ 1969 range(0, max_jint) \ 1970 \ 1971 product(intx, Tier3MinInvocationThreshold, 100, \ 1972 "Minimum invocation to compile at tier 3") \ 1973 range(0, max_jint) \ 1974 \ 1975 product(intx, Tier3CompileThreshold, 2000, \ 1976 "Threshold at which tier 3 compilation is invoked (invocation " \ 1977 "minimum must be satisfied)") \ 1978 range(0, max_jint) \ 1979 \ 1980 product(intx, Tier3BackEdgeThreshold, 60000, \ 1981 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 1982 range(0, max_jint) \ 1983 \ 1984 product(intx, Tier3AOTInvocationThreshold, 10000, \ 1985 "Compile if number of method invocations crosses this " \ 1986 "threshold if coming from AOT") \ 1987 range(0, max_jint) \ 1988 \ 1989 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 1990 "Minimum invocation to compile at tier 3 if coming from AOT") \ 1991 range(0, max_jint) \ 1992 \ 1993 product(intx, Tier3AOTCompileThreshold, 15000, \ 1994 "Threshold at which tier 3 compilation is invoked (invocation " \ 1995 "minimum must be satisfied) if coming from AOT") \ 1996 range(0, max_jint) \ 1997 \ 1998 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 1999 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2000 "if coming from AOT") \ 2001 range(0, max_jint) \ 2002 \ 2003 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \ 2004 "Switch to interpreter to profile if the number of method " \ 2005 "invocations crosses this threshold if coming from AOT " \ 2006 "(applicable only with " \ 2007 "CompilationMode=high-only|high-only-quick-internal)") \ 2008 range(0, max_jint) \ 2009 \ 2010 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \ 2011 "Minimum number of invocations to switch to interpreter " \ 2012 "to profile if coming from AOT " \ 2013 "(applicable only with " \ 2014 "CompilationMode=high-only|high-only-quick-internal)") \ 2015 range(0, max_jint) \ 2016 \ 2017 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \ 2018 "Threshold at which to switch to interpreter to profile " \ 2019 "if coming from AOT " \ 2020 "(invocation minimum must be satisfied, " \ 2021 "applicable only with " \ 2022 "CompilationMode=high-only|high-only-quick-internal)") \ 2023 range(0, max_jint) \ 2024 \ 2025 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \ 2026 "Back edge threshold at which to switch to interpreter " \ 2027 "to profile if coming from AOT " \ 2028 "(applicable only with " \ 2029 "CompilationMode=high-only|high-only-quick-internal)") \ 2030 range(0, max_jint) \ 2031 \ 2032 product(intx, Tier4InvocationThreshold, 5000, \ 2033 "Compile if number of method invocations crosses this " \ 2034 "threshold") \ 2035 range(0, max_jint) \ 2036 \ 2037 product(intx, Tier4MinInvocationThreshold, 600, \ 2038 "Minimum invocation to compile at tier 4") \ 2039 range(0, max_jint) \ 2040 \ 2041 product(intx, Tier4CompileThreshold, 15000, \ 2042 "Threshold at which tier 4 compilation is invoked (invocation " \ 2043 "minimum must be satisfied)") \ 2044 range(0, max_jint) \ 2045 \ 2046 product(intx, Tier4BackEdgeThreshold, 40000, \ 2047 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2048 range(0, max_jint) \ 2049 \ 2050 diagnostic(intx, Tier40InvocationThreshold, 5000, \ 2051 "Compile if number of method invocations crosses this " \ 2052 "threshold (applicable only with " \ 2053 "CompilationMode=high-only|high-only-quick-internal)") \ 2054 range(0, max_jint) \ 2055 \ 2056 diagnostic(intx, Tier40MinInvocationThreshold, 600, \ 2057 "Minimum number of invocations to compile at tier 4 " \ 2058 "(applicable only with " \ 2059 "CompilationMode=high-only|high-only-quick-internal)") \ 2060 range(0, max_jint) \ 2061 \ 2062 diagnostic(intx, Tier40CompileThreshold, 10000, \ 2063 "Threshold at which tier 4 compilation is invoked (invocation " \ 2064 "minimum must be satisfied, applicable only with " \ 2065 "CompilationMode=high-only|high-only-quick-internal)") \ 2066 range(0, max_jint) \ 2067 \ 2068 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \ 2069 "Back edge threshold at which tier 4 OSR compilation is invoked " \ 2070 "(applicable only with " \ 2071 "CompilationMode=high-only|high-only-quick-internal)") \ 2072 range(0, max_jint) \ 2073 \ 2074 diagnostic(intx, Tier0Delay, 5, \ 2075 "If C2 queue size grows over this amount per compiler thread " \ 2076 "do not start profiling in the interpreter " \ 2077 "(applicable only with " \ 2078 "CompilationMode=high-only|high-only-quick-internal)") \ 2079 range(0, max_jint) \ 2080 \ 2081 product(intx, Tier3DelayOn, 5, \ 2082 "If C2 queue size grows over this amount per compiler thread " \ 2083 "stop compiling at tier 3 and start compiling at tier 2") \ 2084 range(0, max_jint) \ 2085 \ 2086 product(intx, Tier3DelayOff, 2, \ 2087 "If C2 queue size is less than this amount per compiler thread " \ 2088 "allow methods compiled at tier 2 transition to tier 3") \ 2089 range(0, max_jint) \ 2090 \ 2091 product(intx, Tier3LoadFeedback, 5, \ 2092 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2093 "reaches this amount per compiler thread") \ 2094 range(0, max_jint) \ 2095 \ 2096 product(intx, Tier4LoadFeedback, 3, \ 2097 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2098 "reaches this amount per compiler thread") \ 2099 range(0, max_jint) \ 2100 \ 2101 product(intx, TieredCompileTaskTimeout, 50, \ 2102 "Kill compile task if method was not used within " \ 2103 "given timeout in milliseconds") \ 2104 range(0, max_intx) \ 2105 \ 2106 product(intx, TieredStopAtLevel, 4, \ 2107 "Stop at given compilation level") \ 2108 range(0, 4) \ 2109 \ 2110 product(intx, Tier0ProfilingStartPercentage, 200, \ 2111 "Start profiling in interpreter if the counters exceed tier 3 " \ 2112 "thresholds (tier 4 thresholds with " \ 2113 "CompilationMode=high-only|high-only-quick-internal)" \ 2114 "by the specified percentage") \ 2115 range(0, max_jint) \ 2116 \ 2117 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2118 "Increase the compile threshold for C1 compilation if the code " \ 2119 "cache is filled by the specified percentage") \ 2120 range(0, 99) \ 2121 \ 2122 product(intx, TieredRateUpdateMinTime, 1, \ 2123 "Minimum rate sampling interval (in milliseconds)") \ 2124 range(0, max_intx) \ 2125 \ 2126 product(intx, TieredRateUpdateMaxTime, 25, \ 2127 "Maximum rate sampling interval (in milliseconds)") \ 2128 range(0, max_intx) \ 2129 \ 2130 product(ccstr, CompilationMode, "default", \ 2131 "Compilation modes: " \ 2132 "default: normal tiered compilation; " \ 2133 "quick-only: C1-only mode; " \ 2134 "high-only: C2/JVMCI-only mode; " \ 2135 "high-only-quick-internal: C2/JVMCI-only mode, " \ 2136 "with JVMCI compiler compiled with C1.") \ 2137 \ 2138 product_pd(bool, TieredCompilation, \ 2139 "Enable tiered compilation") \ 2140 \ 2141 product(bool, PrintTieredEvents, false, \ 2142 "Print tiered events notifications") \ 2143 \ 2144 product_pd(intx, OnStackReplacePercentage, \ 2145 "NON_TIERED number of method invocations/branches (expressed as " \ 2146 "% of CompileThreshold) before (re-)compiling OSR code") \ 2147 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2148 \ 2149 product(intx, InterpreterProfilePercentage, 33, \ 2150 "NON_TIERED number of method invocations/branches (expressed as " \ 2151 "% of CompileThreshold) before profiling in the interpreter") \ 2152 range(0, 100) \ 2153 \ 2154 develop(intx, DesiredMethodLimit, 8000, \ 2155 "The desired maximum method size (in bytecodes) after inlining") \ 2156 \ 2157 develop(intx, HugeMethodLimit, 8000, \ 2158 "Don't compile methods larger than this if " \ 2159 "+DontCompileHugeMethods") \ 2160 \ 2161 /* Properties for Java libraries */ \ 2162 \ 2163 product(uint64_t, MaxDirectMemorySize, 0, \ 2164 "Maximum total size of NIO direct-buffer allocations") \ 2165 range(0, max_jlong) \ 2166 \ 2167 /* Flags used for temporary code during development */ \ 2168 \ 2169 diagnostic(bool, UseNewCode, false, \ 2170 "Testing Only: Use the new version while testing") \ 2171 \ 2172 diagnostic(bool, UseNewCode2, false, \ 2173 "Testing Only: Use the new version while testing") \ 2174 \ 2175 diagnostic(bool, UseNewCode3, false, \ 2176 "Testing Only: Use the new version while testing") \ 2177 \ 2178 /* flags for performance data collection */ \ 2179 \ 2180 product(bool, UsePerfData, true, \ 2181 "Flag to disable jvmstat instrumentation for performance testing "\ 2182 "and problem isolation purposes") \ 2183 \ 2184 product(bool, PerfDataSaveToFile, false, \ 2185 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2186 \ 2187 product(ccstr, PerfDataSaveFile, NULL, \ 2188 "Save PerfData memory to the specified absolute pathname. " \ 2189 "The string %p in the file name (if present) " \ 2190 "will be replaced by pid") \ 2191 \ 2192 product(intx, PerfDataSamplingInterval, 50, \ 2193 "Data sampling interval (in milliseconds)") \ 2194 range(PeriodicTask::min_interval, max_jint) \ 2195 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2196 \ 2197 product(bool, PerfDisableSharedMem, false, \ 2198 "Store performance data in standard memory") \ 2199 \ 2200 product(intx, PerfDataMemorySize, 32*K, \ 2201 "Size of performance data memory region. Will be rounded " \ 2202 "up to a multiple of the native os page size.") \ 2203 range(128, 32*64*K) \ 2204 \ 2205 product(intx, PerfMaxStringConstLength, 1024, \ 2206 "Maximum PerfStringConstant string length before truncation") \ 2207 range(32, 32*K) \ 2208 \ 2209 product(bool, PerfAllowAtExitRegistration, false, \ 2210 "Allow registration of atexit() methods") \ 2211 \ 2212 product(bool, PerfBypassFileSystemCheck, false, \ 2213 "Bypass Win32 file system criteria checks (Windows Only)") \ 2214 \ 2215 product(intx, UnguardOnExecutionViolation, 0, \ 2216 "Unguard page and retry on no-execute fault (Win32 only) " \ 2217 "0=off, 1=conservative, 2=aggressive") \ 2218 range(0, 2) \ 2219 \ 2220 /* Serviceability Support */ \ 2221 \ 2222 product(bool, ManagementServer, false, \ 2223 "Create JMX Management Server") \ 2224 \ 2225 product(bool, DisableAttachMechanism, false, \ 2226 "Disable mechanism that allows tools to attach to this VM") \ 2227 \ 2228 product(bool, StartAttachListener, false, \ 2229 "Always start Attach Listener at VM startup") \ 2230 \ 2231 product(bool, EnableDynamicAgentLoading, true, \ 2232 "Allow tools to load agents with the attach mechanism") \ 2233 \ 2234 manageable(bool, PrintConcurrentLocks, false, \ 2235 "Print java.util.concurrent locks in thread dump") \ 2236 \ 2237 /* Shared spaces */ \ 2238 \ 2239 product(bool, UseSharedSpaces, true, \ 2240 "Use shared spaces for metadata") \ 2241 \ 2242 product(bool, VerifySharedSpaces, false, \ 2243 "Verify integrity of shared spaces") \ 2244 \ 2245 product(bool, RequireSharedSpaces, false, \ 2246 "Require shared spaces for metadata") \ 2247 \ 2248 product(bool, DumpSharedSpaces, false, \ 2249 "Special mode: JVM reads a class list, loads classes, builds " \ 2250 "shared spaces, and dumps the shared spaces to a file to be " \ 2251 "used in future JVM runs") \ 2252 \ 2253 product(bool, DynamicDumpSharedSpaces, false, \ 2254 "Dynamic archive") \ 2255 \ 2256 product(bool, PrintSharedArchiveAndExit, false, \ 2257 "Print shared archive file contents") \ 2258 \ 2259 product(bool, PrintSharedDictionary, false, \ 2260 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2261 "dictionary") \ 2262 \ 2263 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2264 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2265 "Address to allocate shared memory region for class data") \ 2266 range(0, SIZE_MAX) \ 2267 \ 2268 product(ccstr, SharedArchiveConfigFile, NULL, \ 2269 "Data to add to the CDS archive file") \ 2270 \ 2271 product(uintx, SharedSymbolTableBucketSize, 4, \ 2272 "Average number of symbols per bucket in shared table") \ 2273 range(2, 246) \ 2274 \ 2275 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2276 "Allow Java agent to be run with CDS dumping") \ 2277 \ 2278 diagnostic(bool, PrintMethodHandleStubs, false, \ 2279 "Print generated stub code for method handles") \ 2280 \ 2281 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2282 "perform extra checks when constructing method handles") \ 2283 \ 2284 diagnostic(bool, ShowHiddenFrames, false, \ 2285 "show method handle implementation frames (usually hidden)") \ 2286 \ 2287 experimental(bool, TrustFinalNonStaticFields, false, \ 2288 "trust final non-static declarations for constant folding") \ 2289 \ 2290 diagnostic(bool, FoldStableValues, true, \ 2291 "Optimize loads from stable fields (marked w/ @Stable)") \ 2292 \ 2293 diagnostic(int, UseBootstrapCallInfo, 1, \ 2294 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2295 "resolved before the bootstrap method is called; 1: when a BSM " \ 2296 "that may accept a BootstrapCallInfo is detected, use that API " \ 2297 "to pass BSM arguments, which allows the BSM to delay their " \ 2298 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2299 "via that API, instead of with the eagerly-resolved array.") \ 2300 \ 2301 diagnostic(bool, PauseAtStartup, false, \ 2302 "Causes the VM to pause at startup time and wait for the pause " \ 2303 "file to be removed (default: ./vm.paused.<pid>)") \ 2304 \ 2305 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2306 "The file to create and for whose removal to await when pausing " \ 2307 "at startup. (default: ./vm.paused.<pid>)") \ 2308 \ 2309 diagnostic(bool, PauseAtExit, false, \ 2310 "Pause and wait for keypress on exit if a debugger is attached") \ 2311 \ 2312 product(bool, ExtendedDTraceProbes, false, \ 2313 "Enable performance-impacting dtrace probes") \ 2314 \ 2315 product(bool, DTraceMethodProbes, false, \ 2316 "Enable dtrace probes for method-entry and method-exit") \ 2317 \ 2318 product(bool, DTraceAllocProbes, false, \ 2319 "Enable dtrace probes for object allocation") \ 2320 \ 2321 product(bool, DTraceMonitorProbes, false, \ 2322 "Enable dtrace probes for monitor events") \ 2323 \ 2324 product(bool, RelaxAccessControlCheck, false, \ 2325 "Relax the access control checks in the verifier") \ 2326 \ 2327 product(uintx, StringTableSize, defaultStringTableSize, \ 2328 "Number of buckets in the interned String table " \ 2329 "(will be rounded to nearest higher power of 2)") \ 2330 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 2331 \ 2332 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2333 "Number of buckets in the JVM internal Symbol table") \ 2334 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 2335 \ 2336 product(bool, UseStringDeduplication, false, \ 2337 "Use string deduplication") \ 2338 \ 2339 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2340 "A string must reach this age (or be promoted to an old region) " \ 2341 "to be considered for deduplication") \ 2342 range(1, markWord::max_age) \ 2343 \ 2344 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2345 "Force table resize every time the table is scanned") \ 2346 \ 2347 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2348 "Force table rehash every time the table is scanned") \ 2349 \ 2350 diagnostic(bool, WhiteBoxAPI, false, \ 2351 "Enable internal testing APIs") \ 2352 \ 2353 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2354 "Default survivor space alignment in bytes") \ 2355 range(8, 256) \ 2356 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2357 \ 2358 product(ccstr, DumpLoadedClassList, NULL, \ 2359 "Dump the names all loaded classes, that could be stored into " \ 2360 "the CDS archive, in the specified file") \ 2361 \ 2362 product(ccstr, SharedClassListFile, NULL, \ 2363 "Override the default CDS class list") \ 2364 \ 2365 product(ccstr, SharedArchiveFile, NULL, \ 2366 "Override the default location of the CDS archive file") \ 2367 \ 2368 product(ccstr, ArchiveClassesAtExit, NULL, \ 2369 "The path and name of the dynamic archive file") \ 2370 \ 2371 product(ccstr, ExtraSharedClassListFile, NULL, \ 2372 "Extra classlist for building the CDS archive file") \ 2373 \ 2374 diagnostic(intx, ArchiveRelocationMode, 0, \ 2375 "(0) first map at preferred address, and if " \ 2376 "unsuccessful, map at alternative address (default); " \ 2377 "(1) always map at alternative address; " \ 2378 "(2) always map at preferred address, and if unsuccessful, " \ 2379 "do not map the archive") \ 2380 range(0, 2) \ 2381 \ 2382 experimental(size_t, ArrayAllocatorMallocLimit, (size_t)-1, \ 2383 "Allocation less than this value will be allocated " \ 2384 "using malloc. Larger allocations will use mmap.") \ 2385 \ 2386 experimental(bool, AlwaysAtomicAccesses, false, \ 2387 "Accesses to all variables should always be atomic") \ 2388 \ 2389 diagnostic(bool, UseUnalignedAccesses, false, \ 2390 "Use unaligned memory accesses in Unsafe") \ 2391 \ 2392 product_pd(bool, PreserveFramePointer, \ 2393 "Use the FP register for holding the frame pointer " \ 2394 "and not as a general purpose register.") \ 2395 \ 2396 diagnostic(bool, CheckIntrinsics, true, \ 2397 "When a class C is loaded, check that " \ 2398 "(1) all intrinsics defined by the VM for class C are present "\ 2399 "in the loaded class file and are marked with the " \ 2400 "@HotSpotIntrinsicCandidate annotation, that " \ 2401 "(2) there is an intrinsic registered for all loaded methods " \ 2402 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2403 "annotation, and that " \ 2404 "(3) no orphan methods exist for class C (i.e., methods for " \ 2405 "which the VM declares an intrinsic but that are not declared "\ 2406 "in the loaded class C. " \ 2407 "Check (3) is available only in debug builds.") \ 2408 \ 2409 diagnostic_pd(intx, InitArrayShortSize, \ 2410 "Threshold small size (in bytes) for clearing arrays. " \ 2411 "Anything this size or smaller may get converted to discrete " \ 2412 "scalar stores.") \ 2413 range(0, max_intx) \ 2414 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2415 \ 2416 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2417 "Disable backwards compatibility for compile commands.") \ 2418 \ 2419 diagnostic(bool, CompilerDirectivesPrint, false, \ 2420 "Print compiler directives on installation.") \ 2421 diagnostic(int, CompilerDirectivesLimit, 50, \ 2422 "Limit on number of compiler directives.") \ 2423 \ 2424 product(ccstr, AllocateHeapAt, NULL, \ 2425 "Path to the directoy where a temporary file will be created " \ 2426 "to use as the backing store for Java Heap.") \ 2427 \ 2428 experimental(ccstr, AllocateOldGenAt, NULL, \ 2429 "Path to the directoy where a temporary file will be " \ 2430 "created to use as the backing store for old generation." \ 2431 "File of size Xmx is pre-allocated for performance reason, so" \ 2432 "we need that much space available") \ 2433 \ 2434 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2435 "Run periodic metaspace verifications (0 - none, " \ 2436 "1 - always, >1 every nth interval)") \ 2437 \ 2438 diagnostic(bool, ShowRegistersOnAssert, true, \ 2439 "On internal errors, include registers in error report.") \ 2440 \ 2441 diagnostic(bool, UseSwitchProfiling, true, \ 2442 "leverage profiling for table/lookup switch") \ 2443 \ 2444 develop(bool, TraceMemoryWriteback, false, \ 2445 "Trace memory writeback operations") \ 2446 \ 2447 JFR_ONLY(product(bool, FlightRecorder, false, \ 2448 "(Deprecated) Enable Flight Recorder")) \ 2449 \ 2450 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2451 "Flight Recorder options")) \ 2452 \ 2453 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2454 "Start flight recording with options")) \ 2455 \ 2456 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2457 "Use platform unstable time where supported for timestamps only") \ 2458 \ 2459 product(bool, UseNewFieldLayout, true, \ 2460 "(Deprecated) Use new algorithm to compute field layouts") \ 2461 \ 2462 product(bool, UseEmptySlotsInSupers, true, \ 2463 "Allow allocating fields in empty slots of super-classes") \ 2464 \ 2465 diagnostic(bool, DeoptimizeNMethodBarriersALot, false, \ 2466 "Make nmethod barriers deoptimise a lot.") \ 2467 2468 // Interface macros 2469 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2470 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2471 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2472 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2473 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2474 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2475 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2476 #ifdef PRODUCT 2477 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2478 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2479 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2480 #else 2481 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2482 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2483 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2484 #endif // PRODUCT 2485 // Special LP64 flags, product only needed for now. 2486 #ifdef _LP64 2487 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2488 #else 2489 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2490 #endif // _LP64 2491 2492 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2493 DECLARE_PD_DEVELOPER_FLAG, \ 2494 DECLARE_PRODUCT_FLAG, \ 2495 DECLARE_PD_PRODUCT_FLAG, \ 2496 DECLARE_DIAGNOSTIC_FLAG, \ 2497 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2498 DECLARE_EXPERIMENTAL_FLAG, \ 2499 DECLARE_NOTPRODUCT_FLAG, \ 2500 DECLARE_MANAGEABLE_FLAG, \ 2501 DECLARE_PRODUCT_RW_FLAG, \ 2502 DECLARE_LP64_PRODUCT_FLAG, \ 2503 IGNORE_RANGE, \ 2504 IGNORE_CONSTRAINT) 2505 2506 #endif // SHARE_RUNTIME_GLOBALS_HPP