1 /* 2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_RUNTIME_GLOBALS_HPP 26 #define SHARE_RUNTIME_GLOBALS_HPP 27 28 #include "compiler/compiler_globals.hpp" 29 #include "gc/shared/gc_globals.hpp" 30 #include "runtime/globals_shared.hpp" 31 #include "utilities/align.hpp" 32 #include "utilities/globalDefinitions.hpp" 33 #include "utilities/macros.hpp" 34 #include CPU_HEADER(globals) 35 #include OS_HEADER(globals) 36 #include OS_CPU_HEADER(globals) 37 38 // develop flags are settable / visible only during development and are constant in the PRODUCT version 39 // product flags are always settable / visible 40 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 41 42 // A flag must be declared with one of the following types: 43 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t. 44 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used 45 // only in this file, because the macrology requires single-token type names. 46 47 // Note: Diagnostic options not meant for VM tuning or for product modes. 48 // They are to be used for VM quality assurance or field diagnosis 49 // of VM bugs. They are hidden so that users will not be encouraged to 50 // try them as if they were VM ordinary execution options. However, they 51 // are available in the product version of the VM. Under instruction 52 // from support engineers, VM customers can turn them on to collect 53 // diagnostic information about VM problems. To use a VM diagnostic 54 // option, you must first specify +UnlockDiagnosticVMOptions. 55 // (This master switch also affects the behavior of -Xprintflags.) 56 // 57 // experimental flags are in support of features that are not 58 // part of the officially supported product, but are available 59 // for experimenting with. They could, for example, be performance 60 // features that may not have undergone full or rigorous QA, but which may 61 // help performance in some cases and released for experimentation 62 // by the community of users and developers. This flag also allows one to 63 // be able to build a fully supported product that nonetheless also 64 // ships with some unsupported, lightly tested, experimental features. 65 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 66 // UnlockExperimentalVMOptions flag, which allows the control and 67 // modification of the experimental flags. 68 // 69 // Nota bene: neither diagnostic nor experimental options should be used casually, 70 // and they are not supported on production loads, except under explicit 71 // direction from support engineers. 72 // 73 // manageable flags are writeable external product flags. 74 // They are dynamically writeable through the JDK management interface 75 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 76 // These flags are external exported interface (see CCC). The list of 77 // manageable flags can be queried programmatically through the management 78 // interface. 79 // 80 // A flag can be made as "manageable" only if 81 // - the flag is defined in a CCC as an external exported interface. 82 // - the VM implementation supports dynamic setting of the flag. 83 // This implies that the VM must *always* query the flag variable 84 // and not reuse state related to the flag state at any given time. 85 // - you want the flag to be queried programmatically by the customers. 86 // 87 // product_rw flags are writeable internal product flags. 88 // They are like "manageable" flags but for internal/private use. 89 // The list of product_rw flags are internal/private flags which 90 // may be changed/removed in a future release. It can be set 91 // through the management interface to get/set value 92 // when the name of flag is supplied. 93 // 94 // A flag can be made as "product_rw" only if 95 // - the VM implementation supports dynamic setting of the flag. 96 // This implies that the VM must *always* query the flag variable 97 // and not reuse state related to the flag state at any given time. 98 // 99 // Note that when there is a need to support develop flags to be writeable, 100 // it can be done in the same way as product_rw. 101 // 102 // range is a macro that will expand to min and max arguments for range 103 // checking code if provided - see jvmFlagRangeList.hpp 104 // 105 // constraint is a macro that will expand to custom function call 106 // for constraint checking if provided - see jvmFlagConstraintList.hpp 107 108 // Default and minimum StringTable and SymbolTable size values 109 // Must be powers of 2 110 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 111 const size_t minimumStringTableSize = 128; 112 const size_t defaultSymbolTableSize = 32768; // 2^15 113 const size_t minimumSymbolTableSize = 1024; 114 115 #define RUNTIME_FLAGS(develop, \ 116 develop_pd, \ 117 product, \ 118 product_pd, \ 119 diagnostic, \ 120 diagnostic_pd, \ 121 experimental, \ 122 notproduct, \ 123 manageable, \ 124 product_rw, \ 125 lp64_product, \ 126 range, \ 127 constraint) \ 128 \ 129 lp64_product(bool, UseCompressedOops, false, \ 130 "Use 32-bit object references in 64-bit VM. " \ 131 "lp64_product means flag is always constant in 32 bit VM") \ 132 \ 133 lp64_product(bool, UseCompressedClassPointers, false, \ 134 "Use 32-bit class pointers in 64-bit VM. " \ 135 "lp64_product means flag is always constant in 32 bit VM") \ 136 \ 137 notproduct(bool, CheckCompressedOops, true, \ 138 "Generate checks in encoding/decoding code in debug VM") \ 139 \ 140 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 141 "Heap allocation steps through preferred address regions to find" \ 142 " where it can allocate the heap. Number of steps to take per " \ 143 "region.") \ 144 range(1, max_uintx) \ 145 \ 146 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 147 "Default object alignment in bytes, 8 is minimum") \ 148 range(8, 256) \ 149 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 150 \ 151 develop(bool, CleanChunkPoolAsync, true, \ 152 "Clean the chunk pool asynchronously") \ 153 \ 154 diagnostic(uint, HandshakeTimeout, 0, \ 155 "If nonzero set a timeout in milliseconds for handshakes") \ 156 \ 157 experimental(bool, AlwaysSafeConstructors, false, \ 158 "Force safe construction, as if all fields are final.") \ 159 \ 160 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 161 "Enable normal processing of flags relating to field diagnostics")\ 162 \ 163 experimental(bool, UnlockExperimentalVMOptions, false, \ 164 "Enable normal processing of flags relating to experimental " \ 165 "features") \ 166 \ 167 product(bool, JavaMonitorsInStackTrace, true, \ 168 "Print information about Java monitor locks when the stacks are" \ 169 "dumped") \ 170 \ 171 product_pd(bool, UseLargePages, \ 172 "Use large page memory") \ 173 \ 174 product_pd(bool, UseLargePagesIndividualAllocation, \ 175 "Allocate large pages individually for better affinity") \ 176 \ 177 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 178 "Fail large pages individual allocation") \ 179 \ 180 product(bool, UseLargePagesInMetaspace, false, \ 181 "Use large page memory in metaspace. " \ 182 "Only used if UseLargePages is enabled.") \ 183 \ 184 product(bool, UseNUMA, false, \ 185 "Use NUMA if available") \ 186 \ 187 product(bool, UseNUMAInterleaving, false, \ 188 "Interleave memory across NUMA nodes if available") \ 189 \ 190 product(size_t, NUMAInterleaveGranularity, 2*M, \ 191 "Granularity to use for NUMA interleaving on Windows OS") \ 192 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 193 \ 194 product(bool, ForceNUMA, false, \ 195 "(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 \ 356 develop(bool, TraceCallFixup, false, \ 357 "Trace all call fixups") \ 358 \ 359 develop(bool, DeoptimizeALot, false, \ 360 "Deoptimize at every exit from the runtime system") \ 361 \ 362 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 363 "A comma separated list of bcis to deoptimize at") \ 364 \ 365 develop(bool, DeoptimizeRandom, false, \ 366 "Deoptimize random frames on random exit from the runtime system")\ 367 \ 368 notproduct(bool, ZombieALot, false, \ 369 "Create zombies (non-entrant) at exit from the runtime system") \ 370 \ 371 notproduct(bool, WalkStackALot, false, \ 372 "Trace stack (no print) at every exit from the runtime system") \ 373 \ 374 product(bool, Debugging, false, \ 375 "Set when executing debug methods in debug.cpp " \ 376 "(to prevent triggering assertions)") \ 377 \ 378 notproduct(bool, VerifyLastFrame, false, \ 379 "Verify oops on last frame on entry to VM") \ 380 \ 381 product(bool, SafepointTimeout, false, \ 382 "Time out and warn or fail after SafepointTimeoutDelay " \ 383 "milliseconds if failed to reach safepoint") \ 384 \ 385 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 386 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 387 \ 388 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 389 "Abort upon failure to complete VM operation promptly") \ 390 \ 391 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 392 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 393 range(0, max_intx) \ 394 \ 395 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 396 /* typically, at most a few retries are needed */ \ 397 product(intx, SuspendRetryCount, 50, \ 398 "Maximum retry count for an external suspend request") \ 399 range(0, max_intx) \ 400 \ 401 product(intx, SuspendRetryDelay, 5, \ 402 "Milliseconds to delay per retry (* current_retry_count)") \ 403 range(0, max_intx) \ 404 \ 405 product(bool, AssertOnSuspendWaitFailure, false, \ 406 "Assert/Guarantee on external suspend wait failure") \ 407 \ 408 product(bool, TraceSuspendWaitFailures, false, \ 409 "Trace external suspend wait failures") \ 410 \ 411 product(bool, MaxFDLimit, true, \ 412 "Bump the number of file descriptors to maximum (Unix only)") \ 413 \ 414 diagnostic(bool, LogEvents, true, \ 415 "Enable the various ring buffer event logs") \ 416 \ 417 diagnostic(uintx, LogEventsBufferEntries, 20, \ 418 "Number of ring buffer event logs") \ 419 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 420 \ 421 diagnostic(bool, BytecodeVerificationRemote, true, \ 422 "Enable the Java bytecode verifier for remote classes") \ 423 \ 424 diagnostic(bool, BytecodeVerificationLocal, false, \ 425 "Enable the Java bytecode verifier for local classes") \ 426 \ 427 develop(bool, ForceFloatExceptions, trueInDebug, \ 428 "Force exceptions on FP stack under/overflow") \ 429 \ 430 develop(bool, VerifyStackAtCalls, false, \ 431 "Verify that the stack pointer is unchanged after calls") \ 432 \ 433 develop(bool, TraceJavaAssertions, false, \ 434 "Trace java language assertions") \ 435 \ 436 notproduct(bool, VerifyCodeCache, false, \ 437 "Verify code cache on memory allocation/deallocation") \ 438 \ 439 develop(bool, UseMallocOnly, false, \ 440 "Use only malloc/free for allocation (no resource area/arena)") \ 441 \ 442 develop(bool, ZapResourceArea, trueInDebug, \ 443 "Zap freed resource/arena space with 0xABABABAB") \ 444 \ 445 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 446 "Zap freed VM handle space with 0xBCBCBCBC") \ 447 \ 448 notproduct(bool, ZapStackSegments, trueInDebug, \ 449 "Zap allocated/freed stack segments with 0xFADFADED") \ 450 \ 451 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 452 "Zap unused heap space with 0xBAADBABE") \ 453 \ 454 develop(bool, CheckZapUnusedHeapArea, false, \ 455 "Check zapping of unused heap space") \ 456 \ 457 develop(bool, ZapFillerObjects, trueInDebug, \ 458 "Zap filler objects with 0xDEAFBABE") \ 459 \ 460 develop(bool, PrintVMMessages, true, \ 461 "Print VM messages on console") \ 462 \ 463 notproduct(uintx, ErrorHandlerTest, 0, \ 464 "If > 0, provokes an error after VM initialization; the value " \ 465 "determines which error to provoke. See test_error_handler() " \ 466 "in vmError.cpp.") \ 467 \ 468 notproduct(uintx, TestCrashInErrorHandler, 0, \ 469 "If > 0, provokes an error inside VM error handler (a secondary " \ 470 "crash). see test_error_handler() in vmError.cpp") \ 471 \ 472 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 473 "If true, tests SafeFetch inside error handler.") \ 474 \ 475 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 476 "If true, simulates an unresponsive error handler.") \ 477 \ 478 develop(bool, Verbose, false, \ 479 "Print additional debugging information from other modes") \ 480 \ 481 develop(bool, PrintMiscellaneous, false, \ 482 "Print uncategorized debugging information (requires +Verbose)") \ 483 \ 484 develop(bool, WizardMode, false, \ 485 "Print much more debugging information") \ 486 \ 487 product(bool, ShowMessageBoxOnError, false, \ 488 "Keep process alive on VM fatal error") \ 489 \ 490 product(bool, CreateCoredumpOnCrash, true, \ 491 "Create core/mini dump on VM fatal error") \ 492 \ 493 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 494 "Timeout, in seconds, to limit the time spent on writing an " \ 495 "error log in case of a crash.") \ 496 range(0, (uint64_t)max_jlong/1000) \ 497 \ 498 product_pd(bool, UseOSErrorReporting, \ 499 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 500 \ 501 product(bool, SuppressFatalErrorMessage, false, \ 502 "Report NO fatal error message (avoid deadlock)") \ 503 \ 504 product(ccstrlist, OnError, "", \ 505 "Run user-defined commands on fatal error; see VMError.cpp " \ 506 "for examples") \ 507 \ 508 product(ccstrlist, OnOutOfMemoryError, "", \ 509 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 510 \ 511 manageable(bool, HeapDumpBeforeFullGC, false, \ 512 "Dump heap to file before any major stop-the-world GC") \ 513 \ 514 manageable(bool, HeapDumpAfterFullGC, false, \ 515 "Dump heap to file after any major stop-the-world GC") \ 516 \ 517 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 518 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 519 \ 520 manageable(ccstr, HeapDumpPath, NULL, \ 521 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 522 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 523 "in the working directory)") \ 524 \ 525 develop(bool, BreakAtWarning, false, \ 526 "Execute breakpoint upon encountering VM warning") \ 527 \ 528 product(ccstr, NativeMemoryTracking, "off", \ 529 "Native memory tracking options") \ 530 \ 531 diagnostic(bool, PrintNMTStatistics, false, \ 532 "Print native memory tracking summary data if it is on") \ 533 \ 534 diagnostic(bool, LogCompilation, false, \ 535 "Log compilation activity in detail to LogFile") \ 536 \ 537 product(bool, PrintCompilation, false, \ 538 "Print compilations") \ 539 \ 540 product(bool, PrintExtendedThreadInfo, false, \ 541 "Print more information in thread dump") \ 542 \ 543 diagnostic(intx, ScavengeRootsInCode, 2, \ 544 "0: do not allow scavengable oops in the code cache; " \ 545 "1: allow scavenging from the code cache; " \ 546 "2: emit as many constants as the compiler can see") \ 547 range(0, 2) \ 548 \ 549 product(bool, AlwaysRestoreFPU, false, \ 550 "Restore the FPU control word after every JNI call (expensive)") \ 551 \ 552 diagnostic(bool, PrintCompilation2, false, \ 553 "Print additional statistics per compilation") \ 554 \ 555 diagnostic(bool, PrintAdapterHandlers, false, \ 556 "Print code generated for i2c/c2i adapters") \ 557 \ 558 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 559 "Verify that i2c/c2i adapters are called properly") \ 560 \ 561 develop(bool, VerifyAdapterSharing, false, \ 562 "Verify that the code for shared adapters is the equivalent") \ 563 \ 564 diagnostic(bool, PrintAssembly, false, \ 565 "Print assembly code (using external disassembler.so)") \ 566 \ 567 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 568 "Print options string passed to disassembler.so") \ 569 \ 570 notproduct(bool, PrintNMethodStatistics, false, \ 571 "Print a summary statistic for the generated nmethods") \ 572 \ 573 diagnostic(bool, PrintNMethods, false, \ 574 "Print assembly code for nmethods when generated") \ 575 \ 576 diagnostic(bool, PrintNativeNMethods, false, \ 577 "Print assembly code for native nmethods when generated") \ 578 \ 579 develop(bool, PrintDebugInfo, false, \ 580 "Print debug information for all nmethods when generated") \ 581 \ 582 develop(bool, PrintRelocations, false, \ 583 "Print relocation information for all nmethods when generated") \ 584 \ 585 develop(bool, PrintDependencies, false, \ 586 "Print dependency information for all nmethods when generated") \ 587 \ 588 develop(bool, PrintExceptionHandlers, false, \ 589 "Print exception handler tables for all nmethods when generated") \ 590 \ 591 develop(bool, StressCompiledExceptionHandlers, false, \ 592 "Exercise compiled exception handlers") \ 593 \ 594 develop(bool, InterceptOSException, false, \ 595 "Start debugger when an implicit OS (e.g. NULL) " \ 596 "exception happens") \ 597 \ 598 product(bool, PrintCodeCache, false, \ 599 "Print the code cache memory usage when exiting") \ 600 \ 601 develop(bool, PrintCodeCache2, false, \ 602 "Print detailed usage information on the code cache when exiting")\ 603 \ 604 product(bool, PrintCodeCacheOnCompilation, false, \ 605 "Print the code cache memory usage each time a method is " \ 606 "compiled") \ 607 \ 608 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 609 "Print code heap usage statistics on exit and on full condition") \ 610 \ 611 diagnostic(bool, PrintStubCode, false, \ 612 "Print generated stub code") \ 613 \ 614 product(bool, StackTraceInThrowable, true, \ 615 "Collect backtrace in throwable when exception happens") \ 616 \ 617 product(bool, OmitStackTraceInFastThrow, true, \ 618 "Omit backtraces for some 'hot' exceptions in optimized code") \ 619 \ 620 manageable(bool, ShowCodeDetailsInExceptionMessages, false, \ 621 "Show exception messages from RuntimeExceptions that contain " \ 622 "snippets of the failing code. Disable this to improve privacy.") \ 623 \ 624 product(bool, PrintWarnings, true, \ 625 "Print JVM warnings to output stream") \ 626 \ 627 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 628 "Print warnings for stalled SpinLocks") \ 629 \ 630 product(bool, RegisterFinalizersAtInit, true, \ 631 "Register finalizable objects at end of Object.<init> or " \ 632 "after allocation") \ 633 \ 634 develop(bool, RegisterReferences, true, \ 635 "Tell whether the VM should register soft/weak/final/phantom " \ 636 "references") \ 637 \ 638 develop(bool, IgnoreRewrites, false, \ 639 "Suppress rewrites of bytecodes in the oopmap generator. " \ 640 "This is unsafe!") \ 641 \ 642 develop(bool, PrintCodeCacheExtension, false, \ 643 "Print extension of code cache") \ 644 \ 645 develop(bool, UsePrivilegedStack, true, \ 646 "Enable the security JVM functions") \ 647 \ 648 develop(bool, ProtectionDomainVerification, true, \ 649 "Verify protection domain before resolution in system dictionary")\ 650 \ 651 product(bool, ClassUnloading, true, \ 652 "Do unloading of classes") \ 653 \ 654 product(bool, ClassUnloadingWithConcurrentMark, true, \ 655 "Do unloading of classes with a concurrent marking cycle") \ 656 \ 657 develop(bool, DisableStartThread, false, \ 658 "Disable starting of additional Java threads " \ 659 "(for debugging only)") \ 660 \ 661 develop(bool, MemProfiling, false, \ 662 "Write memory usage profiling to log file") \ 663 \ 664 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 665 "Print the system dictionary at exit") \ 666 \ 667 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 668 "Dynamically resize system dictionaries as needed") \ 669 \ 670 product(bool, AlwaysLockClassLoader, false, \ 671 "Require the VM to acquire the class loader lock before calling " \ 672 "loadClass() even for class loaders registering " \ 673 "as parallel capable") \ 674 \ 675 product(bool, AllowParallelDefineClass, false, \ 676 "Allow parallel defineClass requests for class loaders " \ 677 "registering as parallel capable") \ 678 \ 679 product_pd(bool, DontYieldALot, \ 680 "Throw away obvious excess yield calls") \ 681 \ 682 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 683 "Disable the use of stack guard pages if the JVM is loaded " \ 684 "on the primordial process thread") \ 685 \ 686 product(bool, UseLWPSynchronization, true, \ 687 "Use LWP-based instead of libthread-based synchronization " \ 688 "(SPARC only)") \ 689 \ 690 product(intx, MonitorBound, 0, "(Deprecated) Bound Monitor population") \ 691 range(0, max_jint) \ 692 \ 693 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 694 "Percentage of used monitors before triggering cleanup " \ 695 "safepoint which deflates monitors (0 is off). " \ 696 "The check is performed on GuaranteedSafepointInterval.") \ 697 range(0, 100) \ 698 \ 699 experimental(intx, hashCode, 5, \ 700 "(Unstable) select hashCode generation algorithm") \ 701 \ 702 product(bool, FilterSpuriousWakeups, true, \ 703 "When true prevents OS-level spurious, or premature, wakeups " \ 704 "from Object.wait (Ignored for Windows)") \ 705 \ 706 product(bool, ReduceSignalUsage, false, \ 707 "Reduce the use of OS signals in Java and/or the VM") \ 708 \ 709 develop(bool, LoadLineNumberTables, true, \ 710 "Tell whether the class file parser loads line number tables") \ 711 \ 712 develop(bool, LoadLocalVariableTables, true, \ 713 "Tell whether the class file parser loads local variable tables") \ 714 \ 715 develop(bool, LoadLocalVariableTypeTables, true, \ 716 "Tell whether the class file parser loads local variable type" \ 717 "tables") \ 718 \ 719 product(bool, AllowUserSignalHandlers, false, \ 720 "Do not complain if the application installs signal handlers " \ 721 "(Unix only)") \ 722 \ 723 product(bool, UseSignalChaining, true, \ 724 "Use signal-chaining to invoke signal handlers installed " \ 725 "by the application (Unix only)") \ 726 \ 727 product(bool, RestoreMXCSROnJNICalls, false, \ 728 "Restore MXCSR when returning from JNI calls") \ 729 \ 730 product(bool, CheckJNICalls, false, \ 731 "Verify all arguments to JNI calls") \ 732 \ 733 product(bool, UseFastJNIAccessors, true, \ 734 "Use optimized versions of Get<Primitive>Field") \ 735 \ 736 product(intx, MaxJNILocalCapacity, 65536, \ 737 "Maximum allowable local JNI handle capacity to " \ 738 "EnsureLocalCapacity() and PushLocalFrame(), " \ 739 "where <= 0 is unlimited, default: 65536") \ 740 range(min_intx, max_intx) \ 741 \ 742 product(bool, EagerXrunInit, false, \ 743 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 744 "but not all -Xrun libraries may support the state of the VM " \ 745 "at this time") \ 746 \ 747 product(bool, PreserveAllAnnotations, false, \ 748 "Preserve RuntimeInvisibleAnnotations as well " \ 749 "as RuntimeVisibleAnnotations") \ 750 \ 751 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 752 "Number of OutOfMemoryErrors preallocated with backtrace") \ 753 \ 754 product(bool, UseXMMForArrayCopy, false, \ 755 "Use SSE2 MOVQ instruction for Arraycopy") \ 756 \ 757 notproduct(bool, PrintFieldLayout, false, \ 758 "Print field layout for each class") \ 759 \ 760 /* Need to limit the extent of the padding to reasonable size. */\ 761 /* 8K is well beyond the reasonable HW cache line size, even with */\ 762 /* aggressive prefetching, while still leaving the room for segregating */\ 763 /* among the distinct pages. */\ 764 product(intx, ContendedPaddingWidth, 128, \ 765 "How many bytes to pad the fields/classes marked @Contended with")\ 766 range(0, 8192) \ 767 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 768 \ 769 product(bool, EnableContended, true, \ 770 "Enable @Contended annotation support") \ 771 \ 772 product(bool, RestrictContended, true, \ 773 "Restrict @Contended to trusted classes") \ 774 \ 775 product(bool, UseBiasedLocking, true, \ 776 "Enable biased locking in JVM") \ 777 \ 778 product(intx, BiasedLockingStartupDelay, 0, \ 779 "Number of milliseconds to wait before enabling biased locking") \ 780 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 781 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 782 \ 783 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 784 "Print statistics of biased locking in JVM") \ 785 \ 786 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 787 "Threshold of number of revocations per type to try to " \ 788 "rebias all objects in the heap of that type") \ 789 range(0, max_intx) \ 790 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 791 \ 792 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 793 "Threshold of number of revocations per type to permanently " \ 794 "revoke biases of all objects in the heap of that type") \ 795 range(0, max_intx) \ 796 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 797 \ 798 product(intx, BiasedLockingDecayTime, 25000, \ 799 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 800 "type after previous bulk rebias") \ 801 range(500, max_intx) \ 802 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 803 \ 804 product(bool, ExitOnOutOfMemoryError, false, \ 805 "JVM exits on the first occurrence of an out-of-memory error") \ 806 \ 807 product(bool, CrashOnOutOfMemoryError, false, \ 808 "JVM aborts, producing an error log and core/mini dump, on the " \ 809 "first occurrence of an out-of-memory error") \ 810 \ 811 /* tracing */ \ 812 \ 813 develop(bool, StressRewriter, false, \ 814 "Stress linktime bytecode rewriting") \ 815 \ 816 product(ccstr, TraceJVMTI, NULL, \ 817 "Trace flags for JVMTI functions and events") \ 818 \ 819 /* This option can change an EMCP method into an obsolete method. */ \ 820 /* This can affect tests that except specific methods to be EMCP. */ \ 821 /* This option should be used with caution. */ \ 822 product(bool, StressLdcRewrite, false, \ 823 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 824 \ 825 /* change to false by default sometime after Mustang */ \ 826 product(bool, VerifyMergedCPBytecodes, true, \ 827 "Verify bytecodes after RedefineClasses constant pool merging") \ 828 \ 829 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 830 "(Deprecated) Allow redefinition to add and delete private " \ 831 "static or final methods for compatibility with old releases") \ 832 \ 833 develop(bool, TraceBytecodes, false, \ 834 "Trace bytecode execution") \ 835 \ 836 develop(bool, TraceICs, false, \ 837 "Trace inline cache changes") \ 838 \ 839 notproduct(bool, TraceInvocationCounterOverflow, false, \ 840 "Trace method invocation counter overflow") \ 841 \ 842 develop(bool, TraceInlineCacheClearing, false, \ 843 "Trace clearing of inline caches in nmethods") \ 844 \ 845 develop(bool, TraceDependencies, false, \ 846 "Trace dependencies") \ 847 \ 848 develop(bool, VerifyDependencies, trueInDebug, \ 849 "Exercise and verify the compilation dependency mechanism") \ 850 \ 851 develop(bool, TraceNewOopMapGeneration, false, \ 852 "Trace OopMapGeneration") \ 853 \ 854 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 855 "Trace OopMapGeneration: print detailed cell states") \ 856 \ 857 develop(bool, TimeOopMap, false, \ 858 "Time calls to GenerateOopMap::compute_map() in sum") \ 859 \ 860 develop(bool, TimeOopMap2, false, \ 861 "Time calls to GenerateOopMap::compute_map() individually") \ 862 \ 863 develop(bool, TraceOopMapRewrites, false, \ 864 "Trace rewriting of method oops during oop map generation") \ 865 \ 866 develop(bool, TraceICBuffer, false, \ 867 "Trace usage of IC buffer") \ 868 \ 869 develop(bool, TraceCompiledIC, false, \ 870 "Trace changes of compiled IC") \ 871 \ 872 develop(bool, FLSVerifyDictionary, false, \ 873 "Do lots of (expensive) FLS dictionary verification") \ 874 \ 875 \ 876 notproduct(bool, CheckMemoryInitialization, false, \ 877 "Check memory initialization") \ 878 \ 879 product(uintx, ProcessDistributionStride, 4, \ 880 "Stride through processors when distributing processes") \ 881 range(0, max_juint) \ 882 \ 883 develop(bool, TraceFinalizerRegistration, false, \ 884 "Trace registration of final references") \ 885 \ 886 product(bool, IgnoreEmptyClassPaths, false, \ 887 "Ignore empty path elements in -classpath") \ 888 \ 889 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 890 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 891 "Initial size of the boot class loader data metaspace") \ 892 range(30*K, max_uintx/BytesPerWord) \ 893 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 894 \ 895 product(bool, PrintHeapAtSIGBREAK, true, \ 896 "Print heap layout in response to SIGBREAK") \ 897 \ 898 manageable(bool, PrintClassHistogram, false, \ 899 "Print a histogram of class instances") \ 900 \ 901 experimental(double, ObjectCountCutOffPercent, 0.5, \ 902 "The percentage of the used heap that the instances of a class " \ 903 "must occupy for the class to generate a trace event") \ 904 range(0.0, 100.0) \ 905 \ 906 /* JVMTI heap profiling */ \ 907 \ 908 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 909 "Trace JVMTI object tagging calls") \ 910 \ 911 diagnostic(bool, VerifyBeforeIteration, false, \ 912 "Verify memory system before JVMTI iteration") \ 913 \ 914 /* compiler interface */ \ 915 \ 916 develop(bool, CIPrintCompilerName, false, \ 917 "when CIPrint is active, print the name of the active compiler") \ 918 \ 919 diagnostic(bool, CIPrintCompileQueue, false, \ 920 "display the contents of the compile queue whenever a " \ 921 "compilation is enqueued") \ 922 \ 923 develop(bool, CIPrintRequests, false, \ 924 "display every request for compilation") \ 925 \ 926 product(bool, CITime, false, \ 927 "collect timing information for compilation") \ 928 \ 929 develop(bool, CITimeVerbose, false, \ 930 "be more verbose in compilation timings") \ 931 \ 932 develop(bool, CITimeEach, false, \ 933 "display timing information after each successful compilation") \ 934 \ 935 develop(bool, CICountOSR, false, \ 936 "use a separate counter when assigning ids to osr compilations") \ 937 \ 938 develop(bool, CICompileNatives, true, \ 939 "compile native methods if supported by the compiler") \ 940 \ 941 develop_pd(bool, CICompileOSR, \ 942 "compile on stack replacement methods if supported by the " \ 943 "compiler") \ 944 \ 945 develop(bool, CIPrintMethodCodes, false, \ 946 "print method bytecodes of the compiled code") \ 947 \ 948 develop(bool, CIPrintTypeFlow, false, \ 949 "print the results of ciTypeFlow analysis") \ 950 \ 951 develop(bool, CITraceTypeFlow, false, \ 952 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 953 \ 954 develop(intx, OSROnlyBCI, -1, \ 955 "OSR only at this bci. Negative values mean exclude that bci") \ 956 \ 957 /* compiler */ \ 958 \ 959 /* notice: the max range value here is max_jint, not max_intx */ \ 960 /* because of overflow issue */ \ 961 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 962 "Number of compiler threads to run") \ 963 range(0, max_jint) \ 964 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 965 \ 966 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 967 "Dynamically choose the number of parallel compiler threads") \ 968 \ 969 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 970 "Reduce the number of parallel compiler threads when they " \ 971 "are not used") \ 972 \ 973 diagnostic(bool, TraceCompilerThreads, false, \ 974 "Trace creation and removal of compiler threads") \ 975 \ 976 develop(bool, InjectCompilerCreationFailure, false, \ 977 "Inject thread creation failures for " \ 978 "UseDynamicNumberOfCompilerThreads") \ 979 \ 980 develop(bool, UseStackBanging, true, \ 981 "use stack banging for stack overflow checks (required for " \ 982 "proper StackOverflow handling; disable only to measure cost " \ 983 "of stackbanging)") \ 984 \ 985 develop(bool, GenerateSynchronizationCode, true, \ 986 "generate locking/unlocking code for synchronized methods and " \ 987 "monitors") \ 988 \ 989 develop(bool, GenerateRangeChecks, true, \ 990 "Generate range checks for array accesses") \ 991 \ 992 diagnostic_pd(bool, ImplicitNullChecks, \ 993 "Generate code for implicit null checks") \ 994 \ 995 product_pd(bool, TrapBasedNullChecks, \ 996 "Generate code for null checks that uses a cmp and trap " \ 997 "instruction raising SIGTRAP. This is only used if an access to" \ 998 "null (+offset) will not raise a SIGSEGV, i.e.," \ 999 "ImplicitNullChecks don't work (PPC64).") \ 1000 \ 1001 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1002 "Enable Thread SMR extra validity checks") \ 1003 \ 1004 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1005 "Enable Thread SMR Statistics") \ 1006 \ 1007 product(bool, UseNotificationThread, true, \ 1008 "Use Notification Thread") \ 1009 \ 1010 product(bool, Inline, true, \ 1011 "Enable inlining") \ 1012 \ 1013 product(bool, ClipInlining, true, \ 1014 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1015 \ 1016 develop(bool, UseCHA, true, \ 1017 "Enable CHA") \ 1018 \ 1019 product(bool, UseTypeProfile, true, \ 1020 "Check interpreter profile for historically monomorphic calls") \ 1021 \ 1022 diagnostic(bool, PrintInlining, false, \ 1023 "Print inlining optimizations") \ 1024 \ 1025 product(bool, UsePopCountInstruction, false, \ 1026 "Use population count instruction") \ 1027 \ 1028 develop(bool, EagerInitialization, false, \ 1029 "Eagerly initialize classes if possible") \ 1030 \ 1031 diagnostic(bool, LogTouchedMethods, false, \ 1032 "Log methods which have been ever touched in runtime") \ 1033 \ 1034 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1035 "Print all methods that have been ever touched in runtime") \ 1036 \ 1037 develop(bool, TraceMethodReplacement, false, \ 1038 "Print when methods are replaced do to recompilation") \ 1039 \ 1040 develop(bool, PrintMethodFlushing, false, \ 1041 "Print the nmethods being flushed") \ 1042 \ 1043 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1044 "print statistics about method flushing") \ 1045 \ 1046 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1047 "Number of compiled code invocations after which " \ 1048 "the method is considered as hot by the flusher") \ 1049 range(1, max_jint) \ 1050 \ 1051 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1052 "Minimum number of sweeper passes before an nmethod " \ 1053 "can be flushed") \ 1054 range(0, max_intx) \ 1055 \ 1056 product(bool, UseCodeAging, true, \ 1057 "Insert counter to detect warm methods") \ 1058 \ 1059 diagnostic(bool, StressCodeAging, false, \ 1060 "Start with counters compiled in") \ 1061 \ 1062 develop(bool, StressCodeBuffers, false, \ 1063 "Exercise code buffer expansion and other rare state changes") \ 1064 \ 1065 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1066 "Generate extra debugging information for non-safepoints in " \ 1067 "nmethods") \ 1068 \ 1069 product(bool, PrintVMOptions, false, \ 1070 "Print flags that appeared on the command line") \ 1071 \ 1072 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1073 "Ignore unrecognized VM options") \ 1074 \ 1075 product(bool, PrintCommandLineFlags, false, \ 1076 "Print flags specified on command line or set by ergonomics") \ 1077 \ 1078 product(bool, PrintFlagsInitial, false, \ 1079 "Print all VM flags before argument processing and exit VM") \ 1080 \ 1081 product(bool, PrintFlagsFinal, false, \ 1082 "Print all VM flags after argument and ergonomic processing") \ 1083 \ 1084 notproduct(bool, PrintFlagsWithComments, false, \ 1085 "Print all VM flags with default values and descriptions and " \ 1086 "exit") \ 1087 \ 1088 product(bool, PrintFlagsRanges, false, \ 1089 "Print VM flags and their ranges") \ 1090 \ 1091 diagnostic(bool, SerializeVMOutput, true, \ 1092 "Use a mutex to serialize output to tty and LogFile") \ 1093 \ 1094 diagnostic(bool, DisplayVMOutput, true, \ 1095 "Display all VM output on the tty, independently of LogVMOutput") \ 1096 \ 1097 diagnostic(bool, LogVMOutput, false, \ 1098 "Save VM output to LogFile") \ 1099 \ 1100 diagnostic(ccstr, LogFile, NULL, \ 1101 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1102 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1103 \ 1104 product(ccstr, ErrorFile, NULL, \ 1105 "If an error occurs, save the error data to this file " \ 1106 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1107 \ 1108 product(bool, ExtensiveErrorReports, \ 1109 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1110 "Error reports are more extensive.") \ 1111 \ 1112 product(bool, DisplayVMOutputToStderr, false, \ 1113 "If DisplayVMOutput is true, display all VM output to stderr") \ 1114 \ 1115 product(bool, DisplayVMOutputToStdout, false, \ 1116 "If DisplayVMOutput is true, display all VM output to stdout") \ 1117 \ 1118 product(bool, ErrorFileToStderr, false, \ 1119 "If true, error data is printed to stderr instead of a file") \ 1120 \ 1121 product(bool, ErrorFileToStdout, false, \ 1122 "If true, error data is printed to stdout instead of a file") \ 1123 \ 1124 product(bool, UseHeavyMonitors, false, \ 1125 "use heavyweight instead of lightweight Java monitors") \ 1126 \ 1127 product(bool, PrintStringTableStatistics, false, \ 1128 "print statistics about the StringTable and SymbolTable") \ 1129 \ 1130 diagnostic(bool, VerifyStringTableAtExit, false, \ 1131 "verify StringTable contents at exit") \ 1132 \ 1133 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1134 "print histogram of the symbol table") \ 1135 \ 1136 notproduct(bool, ExitVMOnVerifyError, false, \ 1137 "standard exit from VM if bytecode verify error " \ 1138 "(only in debug mode)") \ 1139 \ 1140 diagnostic(ccstr, AbortVMOnException, NULL, \ 1141 "Call fatal if this exception is thrown. Example: " \ 1142 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1143 \ 1144 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1145 "Call fatal if the exception pointed by AbortVMOnException " \ 1146 "has this message") \ 1147 \ 1148 develop(bool, DebugVtables, false, \ 1149 "add debugging code to vtable dispatch") \ 1150 \ 1151 notproduct(bool, PrintVtableStats, false, \ 1152 "print vtables stats at end of run") \ 1153 \ 1154 develop(bool, TraceCreateZombies, false, \ 1155 "trace creation of zombie nmethods") \ 1156 \ 1157 product(bool, RangeCheckElimination, true, \ 1158 "Eliminate range checks") \ 1159 \ 1160 develop_pd(bool, UncommonNullCast, \ 1161 "track occurrences of null in casts; adjust compiler tactics") \ 1162 \ 1163 develop(bool, TypeProfileCasts, true, \ 1164 "treat casts like calls for purposes of type profiling") \ 1165 \ 1166 develop(bool, TraceLivenessGen, false, \ 1167 "Trace the generation of liveness analysis information") \ 1168 \ 1169 notproduct(bool, TraceLivenessQuery, false, \ 1170 "Trace queries of liveness analysis information") \ 1171 \ 1172 notproduct(bool, CollectIndexSetStatistics, false, \ 1173 "Collect information about IndexSets") \ 1174 \ 1175 develop(bool, UseLoopSafepoints, true, \ 1176 "Generate Safepoint nodes in every loop") \ 1177 \ 1178 develop(intx, FastAllocateSizeLimit, 128*K, \ 1179 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1180 "Inline allocations larger than this in doublewords must go slow")\ 1181 \ 1182 product_pd(bool, CompactStrings, \ 1183 "Enable Strings to use single byte chars in backing store") \ 1184 \ 1185 product_pd(uintx, TypeProfileLevel, \ 1186 "=XYZ, with Z: Type profiling of arguments at call; " \ 1187 "Y: Type profiling of return value at call; " \ 1188 "X: Type profiling of parameters to methods; " \ 1189 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1190 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1191 \ 1192 product(intx, TypeProfileArgsLimit, 2, \ 1193 "max number of call arguments to consider for type profiling") \ 1194 range(0, 16) \ 1195 \ 1196 product(intx, TypeProfileParmsLimit, 2, \ 1197 "max number of incoming parameters to consider for type profiling"\ 1198 ", -1 for all") \ 1199 range(-1, 64) \ 1200 \ 1201 /* statistics */ \ 1202 develop(bool, CountCompiledCalls, false, \ 1203 "Count method invocations") \ 1204 \ 1205 notproduct(bool, CountRuntimeCalls, false, \ 1206 "Count VM runtime calls") \ 1207 \ 1208 develop(bool, CountJNICalls, false, \ 1209 "Count jni method invocations") \ 1210 \ 1211 notproduct(bool, CountJVMCalls, false, \ 1212 "Count jvm method invocations") \ 1213 \ 1214 notproduct(bool, CountRemovableExceptions, false, \ 1215 "Count exceptions that could be replaced by branches due to " \ 1216 "inlining") \ 1217 \ 1218 notproduct(bool, ICMissHistogram, false, \ 1219 "Produce histogram of IC misses") \ 1220 \ 1221 /* interpreter */ \ 1222 product_pd(bool, RewriteBytecodes, \ 1223 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1224 \ 1225 product_pd(bool, RewriteFrequentPairs, \ 1226 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1227 \ 1228 diagnostic(bool, PrintInterpreter, false, \ 1229 "Print the generated interpreter code") \ 1230 \ 1231 product(bool, UseInterpreter, true, \ 1232 "Use interpreter for non-compiled methods") \ 1233 \ 1234 develop(bool, UseFastSignatureHandlers, true, \ 1235 "Use fast signature handlers for native calls") \ 1236 \ 1237 product(bool, UseLoopCounter, true, \ 1238 "Increment invocation counter on backward branch") \ 1239 \ 1240 product_pd(bool, UseOnStackReplacement, \ 1241 "Use on stack replacement, calls runtime if invoc. counter " \ 1242 "overflows in loop") \ 1243 \ 1244 notproduct(bool, TraceOnStackReplacement, false, \ 1245 "Trace on stack replacement") \ 1246 \ 1247 product_pd(bool, PreferInterpreterNativeStubs, \ 1248 "Use always interpreter stubs for native methods invoked via " \ 1249 "interpreter") \ 1250 \ 1251 develop(bool, CountBytecodes, false, \ 1252 "Count number of bytecodes executed") \ 1253 \ 1254 develop(bool, PrintBytecodeHistogram, false, \ 1255 "Print histogram of the executed bytecodes") \ 1256 \ 1257 develop(bool, PrintBytecodePairHistogram, false, \ 1258 "Print histogram of the executed bytecode pairs") \ 1259 \ 1260 diagnostic(bool, PrintSignatureHandlers, false, \ 1261 "Print code generated for native method signature handlers") \ 1262 \ 1263 develop(bool, VerifyOops, false, \ 1264 "Do plausibility checks for oops") \ 1265 \ 1266 develop(bool, CheckUnhandledOops, false, \ 1267 "Check for unhandled oops in VM code") \ 1268 \ 1269 develop(bool, VerifyJNIFields, trueInDebug, \ 1270 "Verify jfieldIDs for instance fields") \ 1271 \ 1272 notproduct(bool, VerifyJNIEnvThread, false, \ 1273 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1274 "from JNI") \ 1275 \ 1276 develop(bool, VerifyFPU, false, \ 1277 "Verify FPU state (check for NaN's, etc.)") \ 1278 \ 1279 develop(bool, VerifyThread, false, \ 1280 "Watch the thread register for corruption (SPARC only)") \ 1281 \ 1282 develop(bool, VerifyActivationFrameSize, false, \ 1283 "Verify that activation frame didn't become smaller than its " \ 1284 "minimal size") \ 1285 \ 1286 develop(bool, TraceFrequencyInlining, false, \ 1287 "Trace frequency based inlining") \ 1288 \ 1289 develop_pd(bool, InlineIntrinsics, \ 1290 "Inline intrinsics that can be statically resolved") \ 1291 \ 1292 product_pd(bool, ProfileInterpreter, \ 1293 "Profile at the bytecode level during interpretation") \ 1294 \ 1295 develop(bool, TraceProfileInterpreter, false, \ 1296 "Trace profiling at the bytecode level during interpretation. " \ 1297 "This outputs the profiling information collected to improve " \ 1298 "jit compilation.") \ 1299 \ 1300 develop_pd(bool, ProfileTraps, \ 1301 "Profile deoptimization traps at the bytecode level") \ 1302 \ 1303 product(intx, ProfileMaturityPercentage, 20, \ 1304 "number of method invocations/branches (expressed as % of " \ 1305 "CompileThreshold) before using the method's profile") \ 1306 range(0, 100) \ 1307 \ 1308 diagnostic(bool, PrintMethodData, false, \ 1309 "Print the results of +ProfileInterpreter at end of run") \ 1310 \ 1311 develop(bool, VerifyDataPointer, trueInDebug, \ 1312 "Verify the method data pointer during interpreter profiling") \ 1313 \ 1314 develop(bool, VerifyCompiledCode, false, \ 1315 "Include miscellaneous runtime verifications in nmethod code; " \ 1316 "default off because it disturbs nmethod size heuristics") \ 1317 \ 1318 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1319 "Manually make GC thread crash then dump java stack trace; " \ 1320 "Test only") \ 1321 \ 1322 /* compilation */ \ 1323 product(bool, UseCompiler, true, \ 1324 "Use Just-In-Time compilation") \ 1325 \ 1326 product(bool, UseCounterDecay, true, \ 1327 "Adjust recompilation counters") \ 1328 \ 1329 develop(intx, CounterHalfLifeTime, 30, \ 1330 "Half-life time of invocation counters (in seconds)") \ 1331 \ 1332 develop(intx, CounterDecayMinIntervalLength, 500, \ 1333 "The minimum interval (in milliseconds) between invocation of " \ 1334 "CounterDecay") \ 1335 \ 1336 product(bool, AlwaysCompileLoopMethods, false, \ 1337 "When using recompilation, never interpret methods " \ 1338 "containing loops") \ 1339 \ 1340 product(bool, DontCompileHugeMethods, true, \ 1341 "Do not compile methods > HugeMethodLimit") \ 1342 \ 1343 /* Bytecode escape analysis estimation. */ \ 1344 product(bool, EstimateArgEscape, true, \ 1345 "Analyze bytecodes to estimate escape state of arguments") \ 1346 \ 1347 product(intx, BCEATraceLevel, 0, \ 1348 "How much tracing to do of bytecode escape analysis estimates " \ 1349 "(0-3)") \ 1350 range(0, 3) \ 1351 \ 1352 product(intx, MaxBCEAEstimateLevel, 5, \ 1353 "Maximum number of nested calls that are analyzed by BC EA") \ 1354 range(0, max_jint) \ 1355 \ 1356 product(intx, MaxBCEAEstimateSize, 150, \ 1357 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1358 range(0, max_jint) \ 1359 \ 1360 product(intx, AllocatePrefetchStyle, 1, \ 1361 "0 = no prefetch, " \ 1362 "1 = generate prefetch instructions for each allocation, " \ 1363 "2 = use TLAB watermark to gate allocation prefetch, " \ 1364 "3 = generate one prefetch instruction per cache line") \ 1365 range(0, 3) \ 1366 \ 1367 product(intx, AllocatePrefetchDistance, -1, \ 1368 "Distance to prefetch ahead of allocation pointer. " \ 1369 "-1: use system-specific value (automatically determined") \ 1370 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\ 1371 \ 1372 product(intx, AllocatePrefetchLines, 3, \ 1373 "Number of lines to prefetch ahead of array allocation pointer") \ 1374 range(1, 64) \ 1375 \ 1376 product(intx, AllocateInstancePrefetchLines, 1, \ 1377 "Number of lines to prefetch ahead of instance allocation " \ 1378 "pointer") \ 1379 range(1, 64) \ 1380 \ 1381 product(intx, AllocatePrefetchStepSize, 16, \ 1382 "Step size in bytes of sequential prefetch instructions") \ 1383 range(1, 512) \ 1384 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1385 \ 1386 product(intx, AllocatePrefetchInstr, 0, \ 1387 "Select instruction to prefetch ahead of allocation pointer") \ 1388 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1389 \ 1390 /* deoptimization */ \ 1391 develop(bool, TraceDeoptimization, false, \ 1392 "Trace deoptimization") \ 1393 \ 1394 develop(bool, PrintDeoptimizationDetails, false, \ 1395 "Print more information about deoptimization") \ 1396 \ 1397 develop(bool, DebugDeoptimization, false, \ 1398 "Tracing various information while debugging deoptimization") \ 1399 \ 1400 product(intx, SelfDestructTimer, 0, \ 1401 "Will cause VM to terminate after a given time (in minutes) " \ 1402 "(0 means off)") \ 1403 range(0, max_intx) \ 1404 \ 1405 product(intx, MaxJavaStackTraceDepth, 1024, \ 1406 "The maximum number of lines in the stack trace for Java " \ 1407 "exceptions (0 means all)") \ 1408 range(0, max_jint/2) \ 1409 \ 1410 /* notice: the max range value here is max_jint, not max_intx */ \ 1411 /* because of overflow issue */ \ 1412 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1413 "Guarantee a safepoint (at least) every so many milliseconds " \ 1414 "(0 means none)") \ 1415 range(0, max_jint) \ 1416 \ 1417 product(intx, SafepointTimeoutDelay, 10000, \ 1418 "Delay in milliseconds for option SafepointTimeout") \ 1419 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1420 NOT_LP64(range(0, max_intx)) \ 1421 \ 1422 product(intx, NmethodSweepActivity, 10, \ 1423 "Removes cold nmethods from code cache if > 0. Higher values " \ 1424 "result in more aggressive sweeping") \ 1425 range(0, 2000) \ 1426 \ 1427 notproduct(bool, LogSweeper, false, \ 1428 "Keep a ring buffer of sweeper activity") \ 1429 \ 1430 notproduct(intx, SweeperLogEntries, 1024, \ 1431 "Number of records in the ring buffer of sweeper activity") \ 1432 \ 1433 notproduct(intx, MemProfilingInterval, 500, \ 1434 "Time between each invocation of the MemProfiler") \ 1435 \ 1436 develop(intx, MallocCatchPtr, -1, \ 1437 "Hit breakpoint when mallocing/freeing this pointer") \ 1438 \ 1439 notproduct(ccstrlist, SuppressErrorAt, "", \ 1440 "List of assertions (file:line) to muzzle") \ 1441 \ 1442 develop(intx, StackPrintLimit, 100, \ 1443 "number of stack frames to print in VM-level stack dump") \ 1444 \ 1445 notproduct(intx, MaxElementPrintSize, 256, \ 1446 "maximum number of elements to print") \ 1447 \ 1448 notproduct(intx, MaxSubklassPrintSize, 4, \ 1449 "maximum number of subklasses to print when printing klass") \ 1450 \ 1451 product(intx, MaxInlineLevel, 15, \ 1452 "maximum number of nested calls that are inlined") \ 1453 range(0, max_jint) \ 1454 \ 1455 product(intx, MaxRecursiveInlineLevel, 1, \ 1456 "maximum number of nested recursive calls that are inlined") \ 1457 range(0, max_jint) \ 1458 \ 1459 develop(intx, MaxForceInlineLevel, 100, \ 1460 "maximum number of nested calls that are forced for inlining " \ 1461 "(using CompileCommand or marked w/ @ForceInline)") \ 1462 range(0, max_jint) \ 1463 \ 1464 product_pd(intx, InlineSmallCode, \ 1465 "Only inline already compiled methods if their code size is " \ 1466 "less than this") \ 1467 range(0, max_jint) \ 1468 \ 1469 product(intx, MaxInlineSize, 35, \ 1470 "The maximum bytecode size of a method to be inlined") \ 1471 range(0, max_jint) \ 1472 \ 1473 product_pd(intx, FreqInlineSize, \ 1474 "The maximum bytecode size of a frequent method to be inlined") \ 1475 range(0, max_jint) \ 1476 \ 1477 product(intx, MaxTrivialSize, 6, \ 1478 "The maximum bytecode size of a trivial method to be inlined") \ 1479 range(0, max_jint) \ 1480 \ 1481 product(intx, MinInliningThreshold, 250, \ 1482 "The minimum invocation count a method needs to have to be " \ 1483 "inlined") \ 1484 range(0, max_jint) \ 1485 \ 1486 develop(intx, MethodHistogramCutoff, 100, \ 1487 "The cutoff value for method invocation histogram (+CountCalls)") \ 1488 \ 1489 develop(intx, DontYieldALotInterval, 10, \ 1490 "Interval between which yields will be dropped (milliseconds)") \ 1491 \ 1492 notproduct(intx, DeoptimizeALotInterval, 5, \ 1493 "Number of exits until DeoptimizeALot kicks in") \ 1494 \ 1495 notproduct(intx, ZombieALotInterval, 5, \ 1496 "Number of exits until ZombieALot kicks in") \ 1497 \ 1498 diagnostic(uintx, MallocMaxTestWords, 0, \ 1499 "If non-zero, maximum number of words that malloc/realloc can " \ 1500 "allocate (for testing only)") \ 1501 range(0, max_uintx) \ 1502 \ 1503 product(intx, TypeProfileWidth, 2, \ 1504 "Number of receiver types to record in call/cast profile") \ 1505 range(0, 8) \ 1506 \ 1507 develop(intx, BciProfileWidth, 2, \ 1508 "Number of return bci's to record in ret profile") \ 1509 \ 1510 product(intx, PerMethodRecompilationCutoff, 400, \ 1511 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1512 range(-1, max_intx) \ 1513 \ 1514 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1515 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1516 range(-1, max_intx) \ 1517 \ 1518 product(intx, PerMethodTrapLimit, 100, \ 1519 "Limit on traps (of one kind) in a method (includes inlines)") \ 1520 range(0, max_jint) \ 1521 \ 1522 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1523 "Limit on speculative traps (of one kind) in a method " \ 1524 "(includes inlines)") \ 1525 range(0, max_jint) \ 1526 \ 1527 product(intx, PerBytecodeTrapLimit, 4, \ 1528 "Limit on traps (of one kind) at a particular BCI") \ 1529 range(0, max_jint) \ 1530 \ 1531 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1532 "Extra method data trap entries for speculation") \ 1533 \ 1534 develop(intx, InlineFrequencyRatio, 20, \ 1535 "Ratio of call site execution to caller method invocation") \ 1536 range(0, max_jint) \ 1537 \ 1538 diagnostic_pd(intx, InlineFrequencyCount, \ 1539 "Count of call site execution necessary to trigger frequent " \ 1540 "inlining") \ 1541 range(0, max_jint) \ 1542 \ 1543 develop(intx, InlineThrowCount, 50, \ 1544 "Force inlining of interpreted methods that throw this often") \ 1545 range(0, max_jint) \ 1546 \ 1547 develop(intx, InlineThrowMaxSize, 200, \ 1548 "Force inlining of throwing methods smaller than this") \ 1549 range(0, max_jint) \ 1550 \ 1551 develop(intx, ProfilerNodeSize, 1024, \ 1552 "Size in K to allocate for the Profile Nodes of each thread") \ 1553 range(0, 1024) \ 1554 \ 1555 product_pd(size_t, MetaspaceSize, \ 1556 "Initial threshold (in bytes) at which a garbage collection " \ 1557 "is done to reduce Metaspace usage") \ 1558 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1559 \ 1560 product(size_t, MaxMetaspaceSize, max_uintx, \ 1561 "Maximum size of Metaspaces (in bytes)") \ 1562 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1563 \ 1564 product(size_t, CompressedClassSpaceSize, 1*G, \ 1565 "Maximum size of class area in Metaspace when compressed " \ 1566 "class pointers are used") \ 1567 range(1*M, 3*G) \ 1568 \ 1569 manageable(uintx, MinHeapFreeRatio, 40, \ 1570 "The minimum percentage of heap free after GC to avoid expansion."\ 1571 " For most GCs this applies to the old generation. In G1 and" \ 1572 " ParallelGC it applies to the whole heap.") \ 1573 range(0, 100) \ 1574 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1575 \ 1576 manageable(uintx, MaxHeapFreeRatio, 70, \ 1577 "The maximum percentage of heap free after GC to avoid shrinking."\ 1578 " For most GCs this applies to the old generation. In G1 and" \ 1579 " ParallelGC it applies to the whole heap.") \ 1580 range(0, 100) \ 1581 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1582 \ 1583 product(bool, ShrinkHeapInSteps, true, \ 1584 "When disabled, informs the GC to shrink the java heap directly" \ 1585 " to the target size at the next full GC rather than requiring" \ 1586 " smaller steps during multiple full GCs.") \ 1587 \ 1588 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1589 "Number of milliseconds per MB of free space in the heap") \ 1590 range(0, max_intx) \ 1591 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1592 \ 1593 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1594 "The minimum change in heap space due to GC (in bytes)") \ 1595 range(0, max_uintx) \ 1596 \ 1597 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1598 "The minimum expansion of Metaspace (in bytes)") \ 1599 range(0, max_uintx) \ 1600 \ 1601 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1602 "The maximum percentage of Metaspace free after GC to avoid " \ 1603 "shrinking") \ 1604 range(0, 100) \ 1605 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1606 \ 1607 product(uintx, MinMetaspaceFreeRatio, 40, \ 1608 "The minimum percentage of Metaspace free after GC to avoid " \ 1609 "expansion") \ 1610 range(0, 99) \ 1611 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1612 \ 1613 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1614 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1615 range(0, max_uintx) \ 1616 \ 1617 /* stack parameters */ \ 1618 product_pd(intx, StackYellowPages, \ 1619 "Number of yellow zone (recoverable overflows) pages of size " \ 1620 "4KB. If pages are bigger yellow zone is aligned up.") \ 1621 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1622 \ 1623 product_pd(intx, StackRedPages, \ 1624 "Number of red zone (unrecoverable overflows) pages of size " \ 1625 "4KB. If pages are bigger red zone is aligned up.") \ 1626 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1627 \ 1628 product_pd(intx, StackReservedPages, \ 1629 "Number of reserved zone (reserved to annotated methods) pages" \ 1630 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1631 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1632 \ 1633 product(bool, RestrictReservedStack, true, \ 1634 "Restrict @ReservedStackAccess to trusted classes") \ 1635 \ 1636 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1637 product_pd(intx, StackShadowPages, \ 1638 "Number of shadow zone (for overflow checking) pages of size " \ 1639 "4KB. If pages are bigger shadow zone is aligned up. " \ 1640 "This should exceed the depth of the VM and native call stack.") \ 1641 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1642 \ 1643 product_pd(intx, ThreadStackSize, \ 1644 "Thread Stack Size (in Kbytes)") \ 1645 range(0, 1 * M) \ 1646 \ 1647 product_pd(intx, VMThreadStackSize, \ 1648 "Non-Java Thread Stack Size (in Kbytes)") \ 1649 range(0, max_intx/(1 * K)) \ 1650 \ 1651 product_pd(intx, CompilerThreadStackSize, \ 1652 "Compiler Thread Stack Size (in Kbytes)") \ 1653 range(0, max_intx/(1 * K)) \ 1654 \ 1655 develop_pd(size_t, JVMInvokeMethodSlack, \ 1656 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1657 \ 1658 /* code cache parameters */ \ 1659 develop_pd(uintx, CodeCacheSegmentSize, \ 1660 "Code cache segment size (in bytes) - smallest unit of " \ 1661 "allocation") \ 1662 range(1, 1024) \ 1663 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1664 \ 1665 develop_pd(intx, CodeEntryAlignment, \ 1666 "Code entry alignment for generated code (in bytes)") \ 1667 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1668 \ 1669 product_pd(intx, OptoLoopAlignment, \ 1670 "Align inner loops to zero relative to this modulus") \ 1671 range(1, 16) \ 1672 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1673 \ 1674 product_pd(uintx, InitialCodeCacheSize, \ 1675 "Initial code cache size (in bytes)") \ 1676 range(os::vm_page_size(), max_uintx) \ 1677 \ 1678 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1679 "Minimum code cache size (in bytes) required to start VM.") \ 1680 range(0, max_uintx) \ 1681 \ 1682 product(bool, SegmentedCodeCache, false, \ 1683 "Use a segmented code cache") \ 1684 \ 1685 product_pd(uintx, ReservedCodeCacheSize, \ 1686 "Reserved code cache size (in bytes) - maximum code cache size") \ 1687 range(os::vm_page_size(), max_uintx) \ 1688 \ 1689 product_pd(uintx, NonProfiledCodeHeapSize, \ 1690 "Size of code heap with non-profiled methods (in bytes)") \ 1691 range(0, max_uintx) \ 1692 \ 1693 product_pd(uintx, ProfiledCodeHeapSize, \ 1694 "Size of code heap with profiled methods (in bytes)") \ 1695 range(0, max_uintx) \ 1696 \ 1697 product_pd(uintx, NonNMethodCodeHeapSize, \ 1698 "Size of code heap with non-nmethods (in bytes)") \ 1699 range(os::vm_page_size(), max_uintx) \ 1700 \ 1701 product_pd(uintx, CodeCacheExpansionSize, \ 1702 "Code cache expansion size (in bytes)") \ 1703 range(32*K, max_uintx) \ 1704 \ 1705 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1706 "Minimum number of segments in a code cache block") \ 1707 range(1, 100) \ 1708 \ 1709 notproduct(bool, ExitOnFullCodeCache, false, \ 1710 "Exit the VM if we fill the code cache") \ 1711 \ 1712 product(bool, UseCodeCacheFlushing, true, \ 1713 "Remove cold/old nmethods from the code cache") \ 1714 \ 1715 product(uintx, StartAggressiveSweepingAt, 10, \ 1716 "Start aggressive sweeping if X[%] of the code cache is free." \ 1717 "Segmented code cache: X[%] of the non-profiled heap." \ 1718 "Non-segmented code cache: X[%] of the total code cache") \ 1719 range(0, 100) \ 1720 \ 1721 /* AOT parameters */ \ 1722 experimental(bool, UseAOT, false, \ 1723 "Use AOT compiled files") \ 1724 \ 1725 experimental(ccstrlist, AOTLibrary, NULL, \ 1726 "AOT library") \ 1727 \ 1728 experimental(bool, PrintAOT, false, \ 1729 "Print used AOT klasses and methods") \ 1730 \ 1731 notproduct(bool, PrintAOTStatistics, false, \ 1732 "Print AOT statistics") \ 1733 \ 1734 diagnostic(bool, UseAOTStrictLoading, false, \ 1735 "Exit the VM if any of the AOT libraries has invalid config") \ 1736 \ 1737 product(bool, CalculateClassFingerprint, false, \ 1738 "Calculate class fingerprint") \ 1739 \ 1740 /* interpreter debugging */ \ 1741 develop(intx, BinarySwitchThreshold, 5, \ 1742 "Minimal number of lookupswitch entries for rewriting to binary " \ 1743 "switch") \ 1744 \ 1745 develop(intx, StopInterpreterAt, 0, \ 1746 "Stop interpreter execution at specified bytecode number") \ 1747 \ 1748 develop(intx, TraceBytecodesAt, 0, \ 1749 "Trace bytecodes starting with specified bytecode number") \ 1750 \ 1751 /* compiler interface */ \ 1752 develop(intx, CIStart, 0, \ 1753 "The id of the first compilation to permit") \ 1754 \ 1755 develop(intx, CIStop, max_jint, \ 1756 "The id of the last compilation to permit") \ 1757 \ 1758 develop(intx, CIStartOSR, 0, \ 1759 "The id of the first osr compilation to permit " \ 1760 "(CICountOSR must be on)") \ 1761 \ 1762 develop(intx, CIStopOSR, max_jint, \ 1763 "The id of the last osr compilation to permit " \ 1764 "(CICountOSR must be on)") \ 1765 \ 1766 develop(intx, CIBreakAtOSR, -1, \ 1767 "The id of osr compilation to break at") \ 1768 \ 1769 develop(intx, CIBreakAt, -1, \ 1770 "The id of compilation to break at") \ 1771 \ 1772 product(ccstrlist, CompileOnly, "", \ 1773 "List of methods (pkg/class.name) to restrict compilation to") \ 1774 \ 1775 product(ccstr, CompileCommandFile, NULL, \ 1776 "Read compiler commands from this file [.hotspot_compiler]") \ 1777 \ 1778 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1779 "Read compiler directives from this file") \ 1780 \ 1781 product(ccstrlist, CompileCommand, "", \ 1782 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1783 \ 1784 develop(bool, ReplayCompiles, false, \ 1785 "Enable replay of compilations from ReplayDataFile") \ 1786 \ 1787 product(ccstr, ReplayDataFile, NULL, \ 1788 "File containing compilation replay information" \ 1789 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1790 \ 1791 product(ccstr, InlineDataFile, NULL, \ 1792 "File containing inlining replay information" \ 1793 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1794 \ 1795 develop(intx, ReplaySuppressInitializers, 2, \ 1796 "Control handling of class initialization during replay: " \ 1797 "0 - don't do anything special; " \ 1798 "1 - treat all class initializers as empty; " \ 1799 "2 - treat class initializers for application classes as empty; " \ 1800 "3 - allow all class initializers to run during bootstrap but " \ 1801 " pretend they are empty after starting replay") \ 1802 range(0, 3) \ 1803 \ 1804 develop(bool, ReplayIgnoreInitErrors, false, \ 1805 "Ignore exceptions thrown during initialization for replay") \ 1806 \ 1807 product(bool, DumpReplayDataOnError, true, \ 1808 "Record replay data for crashing compiler threads") \ 1809 \ 1810 product(bool, CICompilerCountPerCPU, false, \ 1811 "1 compiler thread for log(N CPUs)") \ 1812 \ 1813 notproduct(intx, CICrashAt, -1, \ 1814 "id of compilation to trigger assert in compiler thread for " \ 1815 "the purpose of testing, e.g. generation of replay data") \ 1816 notproduct(bool, CIObjectFactoryVerify, false, \ 1817 "enable potentially expensive verification in ciObjectFactory") \ 1818 \ 1819 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1820 "Abort VM when method had failed to compile.") \ 1821 \ 1822 /* Priorities */ \ 1823 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1824 \ 1825 product(intx, ThreadPriorityPolicy, 0, \ 1826 "0 : Normal. "\ 1827 " VM chooses priorities that are appropriate for normal "\ 1828 " applications. "\ 1829 " On Windows applications are allowed to use higher native "\ 1830 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1831 " not use the highest possible native priority, "\ 1832 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1833 " system threads. On Linux thread priorities are ignored "\ 1834 " because the OS does not support static priority in "\ 1835 " SCHED_OTHER scheduling class which is the only choice for "\ 1836 " non-root, non-realtime applications. "\ 1837 "1 : Aggressive. "\ 1838 " Java thread priorities map over to the entire range of "\ 1839 " native thread priorities. Higher Java thread priorities map "\ 1840 " to higher native thread priorities. This policy should be "\ 1841 " used with care, as sometimes it can cause performance "\ 1842 " degradation in the application and/or the entire system. On "\ 1843 " Linux/BSD/macOS this policy requires root privilege or an "\ 1844 " extended capability.") \ 1845 range(0, 1) \ 1846 \ 1847 product(bool, ThreadPriorityVerbose, false, \ 1848 "Print priority changes") \ 1849 \ 1850 product(intx, CompilerThreadPriority, -1, \ 1851 "The native priority at which compiler threads should run " \ 1852 "(-1 means no change)") \ 1853 range(min_jint, max_jint) \ 1854 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1855 \ 1856 product(intx, VMThreadPriority, -1, \ 1857 "The native priority at which the VM thread should run " \ 1858 "(-1 means no change)") \ 1859 range(-1, 127) \ 1860 \ 1861 product(intx, JavaPriority1_To_OSPriority, -1, \ 1862 "Map Java priorities to OS priorities") \ 1863 range(-1, 127) \ 1864 \ 1865 product(intx, JavaPriority2_To_OSPriority, -1, \ 1866 "Map Java priorities to OS priorities") \ 1867 range(-1, 127) \ 1868 \ 1869 product(intx, JavaPriority3_To_OSPriority, -1, \ 1870 "Map Java priorities to OS priorities") \ 1871 range(-1, 127) \ 1872 \ 1873 product(intx, JavaPriority4_To_OSPriority, -1, \ 1874 "Map Java priorities to OS priorities") \ 1875 range(-1, 127) \ 1876 \ 1877 product(intx, JavaPriority5_To_OSPriority, -1, \ 1878 "Map Java priorities to OS priorities") \ 1879 range(-1, 127) \ 1880 \ 1881 product(intx, JavaPriority6_To_OSPriority, -1, \ 1882 "Map Java priorities to OS priorities") \ 1883 range(-1, 127) \ 1884 \ 1885 product(intx, JavaPriority7_To_OSPriority, -1, \ 1886 "Map Java priorities to OS priorities") \ 1887 range(-1, 127) \ 1888 \ 1889 product(intx, JavaPriority8_To_OSPriority, -1, \ 1890 "Map Java priorities to OS priorities") \ 1891 range(-1, 127) \ 1892 \ 1893 product(intx, JavaPriority9_To_OSPriority, -1, \ 1894 "Map Java priorities to OS priorities") \ 1895 range(-1, 127) \ 1896 \ 1897 product(intx, JavaPriority10_To_OSPriority,-1, \ 1898 "Map Java priorities to OS priorities") \ 1899 range(-1, 127) \ 1900 \ 1901 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1902 "Java thread priority 10 maps to critical scheduling priority") \ 1903 \ 1904 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1905 "Compiler thread(s) run at critical scheduling priority") \ 1906 \ 1907 develop(intx, NewCodeParameter, 0, \ 1908 "Testing Only: Create a dedicated integer parameter before " \ 1909 "putback") \ 1910 \ 1911 /* new oopmap storage allocation */ \ 1912 develop(intx, MinOopMapAllocation, 8, \ 1913 "Minimum number of OopMap entries in an OopMapSet") \ 1914 \ 1915 /* Background Compilation */ \ 1916 develop(intx, LongCompileThreshold, 50, \ 1917 "Used with +TraceLongCompiles") \ 1918 \ 1919 /* recompilation */ \ 1920 product_pd(intx, CompileThreshold, \ 1921 "number of interpreted method invocations before (re-)compiling") \ 1922 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1923 \ 1924 product(double, CompileThresholdScaling, 1.0, \ 1925 "Factor to control when first compilation happens " \ 1926 "(both with and without tiered compilation): " \ 1927 "values greater than 1.0 delay counter overflow, " \ 1928 "values between 0 and 1.0 rush counter overflow, " \ 1929 "value of 1.0 leaves compilation thresholds unchanged " \ 1930 "value of 0.0 is equivalent to -Xint. " \ 1931 "" \ 1932 "Flag can be set as per-method option. " \ 1933 "If a value is specified for a method, compilation thresholds " \ 1934 "for that method are scaled by both the value of the global flag "\ 1935 "and the value of the per-method flag.") \ 1936 range(0.0, DBL_MAX) \ 1937 \ 1938 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1939 "Interpreter (tier 0) invocation notification frequency") \ 1940 range(0, 30) \ 1941 \ 1942 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 1943 "C1 without MDO (tier 2) invocation notification frequency") \ 1944 range(0, 30) \ 1945 \ 1946 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 1947 "C1 with MDO profiling (tier 3) invocation notification " \ 1948 "frequency") \ 1949 range(0, 30) \ 1950 \ 1951 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 1952 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 1953 range(0, 30) \ 1954 \ 1955 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 1956 "Interpreter (tier 0) invocation notification frequency") \ 1957 range(0, 30) \ 1958 \ 1959 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 1960 "C1 without MDO (tier 2) invocation notification frequency") \ 1961 range(0, 30) \ 1962 \ 1963 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 1964 "C1 with MDO profiling (tier 3) invocation notification " \ 1965 "frequency") \ 1966 range(0, 30) \ 1967 \ 1968 product(intx, Tier2CompileThreshold, 0, \ 1969 "threshold at which tier 2 compilation is invoked") \ 1970 range(0, max_jint) \ 1971 \ 1972 product(intx, Tier2BackEdgeThreshold, 0, \ 1973 "Back edge threshold at which tier 2 compilation is invoked") \ 1974 range(0, max_jint) \ 1975 \ 1976 product(intx, Tier3InvocationThreshold, 200, \ 1977 "Compile if number of method invocations crosses this " \ 1978 "threshold") \ 1979 range(0, max_jint) \ 1980 \ 1981 product(intx, Tier3MinInvocationThreshold, 100, \ 1982 "Minimum invocation to compile at tier 3") \ 1983 range(0, max_jint) \ 1984 \ 1985 product(intx, Tier3CompileThreshold, 2000, \ 1986 "Threshold at which tier 3 compilation is invoked (invocation " \ 1987 "minimum must be satisfied)") \ 1988 range(0, max_jint) \ 1989 \ 1990 product(intx, Tier3BackEdgeThreshold, 60000, \ 1991 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 1992 range(0, max_jint) \ 1993 \ 1994 product(intx, Tier3AOTInvocationThreshold, 10000, \ 1995 "Compile if number of method invocations crosses this " \ 1996 "threshold if coming from AOT") \ 1997 range(0, max_jint) \ 1998 \ 1999 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2000 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2001 range(0, max_jint) \ 2002 \ 2003 product(intx, Tier3AOTCompileThreshold, 15000, \ 2004 "Threshold at which tier 3 compilation is invoked (invocation " \ 2005 "minimum must be satisfied) if coming from AOT") \ 2006 range(0, max_jint) \ 2007 \ 2008 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2009 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2010 "if coming from AOT") \ 2011 range(0, max_jint) \ 2012 \ 2013 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \ 2014 "Switch to interpreter to profile if the number of method " \ 2015 "invocations crosses this threshold if coming from AOT " \ 2016 "(applicable only with " \ 2017 "CompilationMode=high-only|high-only-quick-internal)") \ 2018 range(0, max_jint) \ 2019 \ 2020 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \ 2021 "Minimum number of invocations to switch to interpreter " \ 2022 "to profile if coming from AOT " \ 2023 "(applicable only with " \ 2024 "CompilationMode=high-only|high-only-quick-internal)") \ 2025 range(0, max_jint) \ 2026 \ 2027 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \ 2028 "Threshold at which to switch to interpreter to profile " \ 2029 "if coming from AOT " \ 2030 "(invocation minimum must be satisfied, " \ 2031 "applicable only with " \ 2032 "CompilationMode=high-only|high-only-quick-internal)") \ 2033 range(0, max_jint) \ 2034 \ 2035 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \ 2036 "Back edge threshold at which to switch to interpreter " \ 2037 "to profile if coming from AOT " \ 2038 "(applicable only with " \ 2039 "CompilationMode=high-only|high-only-quick-internal)") \ 2040 range(0, max_jint) \ 2041 \ 2042 product(intx, Tier4InvocationThreshold, 5000, \ 2043 "Compile if number of method invocations crosses this " \ 2044 "threshold") \ 2045 range(0, max_jint) \ 2046 \ 2047 product(intx, Tier4MinInvocationThreshold, 600, \ 2048 "Minimum invocation to compile at tier 4") \ 2049 range(0, max_jint) \ 2050 \ 2051 product(intx, Tier4CompileThreshold, 15000, \ 2052 "Threshold at which tier 4 compilation is invoked (invocation " \ 2053 "minimum must be satisfied)") \ 2054 range(0, max_jint) \ 2055 \ 2056 product(intx, Tier4BackEdgeThreshold, 40000, \ 2057 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2058 range(0, max_jint) \ 2059 \ 2060 diagnostic(intx, Tier40InvocationThreshold, 5000, \ 2061 "Compile if number of method invocations crosses this " \ 2062 "threshold (applicable only with " \ 2063 "CompilationMode=high-only|high-only-quick-internal)") \ 2064 range(0, max_jint) \ 2065 \ 2066 diagnostic(intx, Tier40MinInvocationThreshold, 600, \ 2067 "Minimum number of invocations to compile at tier 4 " \ 2068 "(applicable only with " \ 2069 "CompilationMode=high-only|high-only-quick-internal)") \ 2070 range(0, max_jint) \ 2071 \ 2072 diagnostic(intx, Tier40CompileThreshold, 10000, \ 2073 "Threshold at which tier 4 compilation is invoked (invocation " \ 2074 "minimum must be satisfied, applicable only with " \ 2075 "CompilationMode=high-only|high-only-quick-internal)") \ 2076 range(0, max_jint) \ 2077 \ 2078 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \ 2079 "Back edge threshold at which tier 4 OSR compilation is invoked " \ 2080 "(applicable only with " \ 2081 "CompilationMode=high-only|high-only-quick-internal)") \ 2082 range(0, max_jint) \ 2083 \ 2084 diagnostic(intx, Tier0Delay, 5, \ 2085 "If C2 queue size grows over this amount per compiler thread " \ 2086 "do not start profiling in the interpreter " \ 2087 "(applicable only with " \ 2088 "CompilationMode=high-only|high-only-quick-internal)") \ 2089 range(0, max_jint) \ 2090 \ 2091 product(intx, Tier3DelayOn, 5, \ 2092 "If C2 queue size grows over this amount per compiler thread " \ 2093 "stop compiling at tier 3 and start compiling at tier 2") \ 2094 range(0, max_jint) \ 2095 \ 2096 product(intx, Tier3DelayOff, 2, \ 2097 "If C2 queue size is less than this amount per compiler thread " \ 2098 "allow methods compiled at tier 2 transition to tier 3") \ 2099 range(0, max_jint) \ 2100 \ 2101 product(intx, Tier3LoadFeedback, 5, \ 2102 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2103 "reaches this amount per compiler thread") \ 2104 range(0, max_jint) \ 2105 \ 2106 product(intx, Tier4LoadFeedback, 3, \ 2107 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2108 "reaches this amount per compiler thread") \ 2109 range(0, max_jint) \ 2110 \ 2111 product(intx, TieredCompileTaskTimeout, 50, \ 2112 "Kill compile task if method was not used within " \ 2113 "given timeout in milliseconds") \ 2114 range(0, max_intx) \ 2115 \ 2116 product(intx, TieredStopAtLevel, 4, \ 2117 "Stop at given compilation level") \ 2118 range(0, 4) \ 2119 \ 2120 product(intx, Tier0ProfilingStartPercentage, 200, \ 2121 "Start profiling in interpreter if the counters exceed tier 3 " \ 2122 "thresholds (tier 4 thresholds with " \ 2123 "CompilationMode=high-only|high-only-quick-internal)" \ 2124 "by the specified percentage") \ 2125 range(0, max_jint) \ 2126 \ 2127 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2128 "Increase the compile threshold for C1 compilation if the code " \ 2129 "cache is filled by the specified percentage") \ 2130 range(0, 99) \ 2131 \ 2132 product(intx, TieredRateUpdateMinTime, 1, \ 2133 "Minimum rate sampling interval (in milliseconds)") \ 2134 range(0, max_intx) \ 2135 \ 2136 product(intx, TieredRateUpdateMaxTime, 25, \ 2137 "Maximum rate sampling interval (in milliseconds)") \ 2138 range(0, max_intx) \ 2139 \ 2140 product(ccstr, CompilationMode, "default", \ 2141 "Compilation modes: " \ 2142 "default: normal tiered compilation; " \ 2143 "quick-only: C1-only mode; " \ 2144 "high-only: C2/JVMCI-only mode; " \ 2145 "high-only-quick-internal: C2/JVMCI-only mode, " \ 2146 "with JVMCI compiler compiled with C1.") \ 2147 \ 2148 product_pd(bool, TieredCompilation, \ 2149 "Enable tiered compilation") \ 2150 \ 2151 product(bool, PrintTieredEvents, false, \ 2152 "Print tiered events notifications") \ 2153 \ 2154 product_pd(intx, OnStackReplacePercentage, \ 2155 "NON_TIERED number of method invocations/branches (expressed as " \ 2156 "% of CompileThreshold) before (re-)compiling OSR code") \ 2157 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2158 \ 2159 product(intx, InterpreterProfilePercentage, 33, \ 2160 "NON_TIERED number of method invocations/branches (expressed as " \ 2161 "% of CompileThreshold) before profiling in the interpreter") \ 2162 range(0, 100) \ 2163 \ 2164 develop(intx, DesiredMethodLimit, 8000, \ 2165 "The desired maximum method size (in bytecodes) after inlining") \ 2166 \ 2167 develop(intx, HugeMethodLimit, 8000, \ 2168 "Don't compile methods larger than this if " \ 2169 "+DontCompileHugeMethods") \ 2170 \ 2171 /* Properties for Java libraries */ \ 2172 \ 2173 product(uint64_t, MaxDirectMemorySize, 0, \ 2174 "Maximum total size of NIO direct-buffer allocations") \ 2175 range(0, max_jlong) \ 2176 \ 2177 /* Flags used for temporary code during development */ \ 2178 \ 2179 diagnostic(bool, UseNewCode, false, \ 2180 "Testing Only: Use the new version while testing") \ 2181 \ 2182 diagnostic(bool, UseNewCode2, false, \ 2183 "Testing Only: Use the new version while testing") \ 2184 \ 2185 diagnostic(bool, UseNewCode3, false, \ 2186 "Testing Only: Use the new version while testing") \ 2187 \ 2188 /* flags for performance data collection */ \ 2189 \ 2190 product(bool, UsePerfData, true, \ 2191 "Flag to disable jvmstat instrumentation for performance testing "\ 2192 "and problem isolation purposes") \ 2193 \ 2194 product(bool, PerfDataSaveToFile, false, \ 2195 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2196 \ 2197 product(ccstr, PerfDataSaveFile, NULL, \ 2198 "Save PerfData memory to the specified absolute pathname. " \ 2199 "The string %p in the file name (if present) " \ 2200 "will be replaced by pid") \ 2201 \ 2202 product(intx, PerfDataSamplingInterval, 50, \ 2203 "Data sampling interval (in milliseconds)") \ 2204 range(PeriodicTask::min_interval, max_jint) \ 2205 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2206 \ 2207 product(bool, PerfDisableSharedMem, false, \ 2208 "Store performance data in standard memory") \ 2209 \ 2210 product(intx, PerfDataMemorySize, 32*K, \ 2211 "Size of performance data memory region. Will be rounded " \ 2212 "up to a multiple of the native os page size.") \ 2213 range(128, 32*64*K) \ 2214 \ 2215 product(intx, PerfMaxStringConstLength, 1024, \ 2216 "Maximum PerfStringConstant string length before truncation") \ 2217 range(32, 32*K) \ 2218 \ 2219 product(bool, PerfAllowAtExitRegistration, false, \ 2220 "Allow registration of atexit() methods") \ 2221 \ 2222 product(bool, PerfBypassFileSystemCheck, false, \ 2223 "Bypass Win32 file system criteria checks (Windows Only)") \ 2224 \ 2225 product(intx, UnguardOnExecutionViolation, 0, \ 2226 "Unguard page and retry on no-execute fault (Win32 only) " \ 2227 "0=off, 1=conservative, 2=aggressive") \ 2228 range(0, 2) \ 2229 \ 2230 /* Serviceability Support */ \ 2231 \ 2232 product(bool, ManagementServer, false, \ 2233 "Create JMX Management Server") \ 2234 \ 2235 product(bool, DisableAttachMechanism, false, \ 2236 "Disable mechanism that allows tools to attach to this VM") \ 2237 \ 2238 product(bool, StartAttachListener, false, \ 2239 "Always start Attach Listener at VM startup") \ 2240 \ 2241 product(bool, EnableDynamicAgentLoading, true, \ 2242 "Allow tools to load agents with the attach mechanism") \ 2243 \ 2244 manageable(bool, PrintConcurrentLocks, false, \ 2245 "Print java.util.concurrent locks in thread dump") \ 2246 \ 2247 /* Shared spaces */ \ 2248 \ 2249 product(bool, UseSharedSpaces, true, \ 2250 "Use shared spaces for metadata") \ 2251 \ 2252 product(bool, VerifySharedSpaces, false, \ 2253 "Verify integrity of shared spaces") \ 2254 \ 2255 product(bool, RequireSharedSpaces, false, \ 2256 "Require shared spaces for metadata") \ 2257 \ 2258 product(bool, DumpSharedSpaces, false, \ 2259 "Special mode: JVM reads a class list, loads classes, builds " \ 2260 "shared spaces, and dumps the shared spaces to a file to be " \ 2261 "used in future JVM runs") \ 2262 \ 2263 product(bool, DynamicDumpSharedSpaces, false, \ 2264 "Dynamic archive") \ 2265 \ 2266 product(bool, PrintSharedArchiveAndExit, false, \ 2267 "Print shared archive file contents") \ 2268 \ 2269 product(bool, PrintSharedDictionary, false, \ 2270 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2271 "dictionary") \ 2272 \ 2273 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2274 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2275 "Address to allocate shared memory region for class data") \ 2276 range(0, SIZE_MAX) \ 2277 \ 2278 product(ccstr, SharedArchiveConfigFile, NULL, \ 2279 "Data to add to the CDS archive file") \ 2280 \ 2281 product(uintx, SharedSymbolTableBucketSize, 4, \ 2282 "Average number of symbols per bucket in shared table") \ 2283 range(2, 246) \ 2284 \ 2285 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2286 "Allow Java agent to be run with CDS dumping") \ 2287 \ 2288 diagnostic(bool, PrintMethodHandleStubs, false, \ 2289 "Print generated stub code for method handles") \ 2290 \ 2291 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2292 "perform extra checks when constructing method handles") \ 2293 \ 2294 diagnostic(bool, ShowHiddenFrames, false, \ 2295 "show method handle implementation frames (usually hidden)") \ 2296 \ 2297 experimental(bool, TrustFinalNonStaticFields, false, \ 2298 "trust final non-static declarations for constant folding") \ 2299 \ 2300 diagnostic(bool, FoldStableValues, true, \ 2301 "Optimize loads from stable fields (marked w/ @Stable)") \ 2302 \ 2303 diagnostic(int, UseBootstrapCallInfo, 1, \ 2304 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2305 "resolved before the bootstrap method is called; 1: when a BSM " \ 2306 "that may accept a BootstrapCallInfo is detected, use that API " \ 2307 "to pass BSM arguments, which allows the BSM to delay their " \ 2308 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2309 "via that API, instead of with the eagerly-resolved array.") \ 2310 \ 2311 diagnostic(bool, PauseAtStartup, false, \ 2312 "Causes the VM to pause at startup time and wait for the pause " \ 2313 "file to be removed (default: ./vm.paused.<pid>)") \ 2314 \ 2315 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2316 "The file to create and for whose removal to await when pausing " \ 2317 "at startup. (default: ./vm.paused.<pid>)") \ 2318 \ 2319 diagnostic(bool, PauseAtExit, false, \ 2320 "Pause and wait for keypress on exit if a debugger is attached") \ 2321 \ 2322 product(bool, ExtendedDTraceProbes, false, \ 2323 "Enable performance-impacting dtrace probes") \ 2324 \ 2325 product(bool, DTraceMethodProbes, false, \ 2326 "Enable dtrace probes for method-entry and method-exit") \ 2327 \ 2328 product(bool, DTraceAllocProbes, false, \ 2329 "Enable dtrace probes for object allocation") \ 2330 \ 2331 product(bool, DTraceMonitorProbes, false, \ 2332 "Enable dtrace probes for monitor events") \ 2333 \ 2334 product(bool, RelaxAccessControlCheck, false, \ 2335 "Relax the access control checks in the verifier") \ 2336 \ 2337 product(uintx, StringTableSize, defaultStringTableSize, \ 2338 "Number of buckets in the interned String table " \ 2339 "(will be rounded to nearest higher power of 2)") \ 2340 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 2341 \ 2342 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2343 "Number of buckets in the JVM internal Symbol table") \ 2344 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 2345 \ 2346 product(bool, UseStringDeduplication, false, \ 2347 "Use string deduplication") \ 2348 \ 2349 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2350 "A string must reach this age (or be promoted to an old region) " \ 2351 "to be considered for deduplication") \ 2352 range(1, markWord::max_age) \ 2353 \ 2354 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2355 "Force table resize every time the table is scanned") \ 2356 \ 2357 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2358 "Force table rehash every time the table is scanned") \ 2359 \ 2360 diagnostic(bool, WhiteBoxAPI, false, \ 2361 "Enable internal testing APIs") \ 2362 \ 2363 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2364 "Default survivor space alignment in bytes") \ 2365 range(8, 256) \ 2366 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2367 \ 2368 product(ccstr, DumpLoadedClassList, NULL, \ 2369 "Dump the names all loaded classes, that could be stored into " \ 2370 "the CDS archive, in the specified file") \ 2371 \ 2372 product(ccstr, SharedClassListFile, NULL, \ 2373 "Override the default CDS class list") \ 2374 \ 2375 product(ccstr, SharedArchiveFile, NULL, \ 2376 "Override the default location of the CDS archive file") \ 2377 \ 2378 product(ccstr, ArchiveClassesAtExit, NULL, \ 2379 "The path and name of the dynamic archive file") \ 2380 \ 2381 product(ccstr, ExtraSharedClassListFile, NULL, \ 2382 "Extra classlist for building the CDS archive file") \ 2383 \ 2384 diagnostic(intx, ArchiveRelocationMode, 0, \ 2385 "(0) first map at preferred address, and if " \ 2386 "unsuccessful, map at alternative address (default); " \ 2387 "(1) always map at alternative address; " \ 2388 "(2) always map at preferred address, and if unsuccessful, " \ 2389 "do not map the archive") \ 2390 range(0, 2) \ 2391 \ 2392 experimental(size_t, ArrayAllocatorMallocLimit, \ 2393 (size_t)-1, \ 2394 "Allocation less than this value will be allocated " \ 2395 "using malloc. Larger allocations will use mmap.") \ 2396 \ 2397 experimental(bool, AlwaysAtomicAccesses, false, \ 2398 "Accesses to all variables should always be atomic") \ 2399 \ 2400 diagnostic(bool, UseUnalignedAccesses, false, \ 2401 "Use unaligned memory accesses in Unsafe") \ 2402 \ 2403 product_pd(bool, PreserveFramePointer, \ 2404 "Use the FP register for holding the frame pointer " \ 2405 "and not as a general purpose register.") \ 2406 \ 2407 diagnostic(bool, CheckIntrinsics, true, \ 2408 "When a class C is loaded, check that " \ 2409 "(1) all intrinsics defined by the VM for class C are present "\ 2410 "in the loaded class file and are marked with the " \ 2411 "@HotSpotIntrinsicCandidate annotation, that " \ 2412 "(2) there is an intrinsic registered for all loaded methods " \ 2413 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2414 "annotation, and that " \ 2415 "(3) no orphan methods exist for class C (i.e., methods for " \ 2416 "which the VM declares an intrinsic but that are not declared "\ 2417 "in the loaded class C. " \ 2418 "Check (3) is available only in debug builds.") \ 2419 \ 2420 diagnostic_pd(intx, InitArrayShortSize, \ 2421 "Threshold small size (in bytes) for clearing arrays. " \ 2422 "Anything this size or smaller may get converted to discrete " \ 2423 "scalar stores.") \ 2424 range(0, max_intx) \ 2425 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2426 \ 2427 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2428 "Disable backwards compatibility for compile commands.") \ 2429 \ 2430 diagnostic(bool, CompilerDirectivesPrint, false, \ 2431 "Print compiler directives on installation.") \ 2432 diagnostic(int, CompilerDirectivesLimit, 50, \ 2433 "Limit on number of compiler directives.") \ 2434 \ 2435 product(ccstr, AllocateHeapAt, NULL, \ 2436 "Path to the directoy where a temporary file will be created " \ 2437 "to use as the backing store for Java Heap.") \ 2438 \ 2439 experimental(ccstr, AllocateOldGenAt, NULL, \ 2440 "Path to the directoy where a temporary file will be " \ 2441 "created to use as the backing store for old generation." \ 2442 "File of size Xmx is pre-allocated for performance reason, so" \ 2443 "we need that much space available") \ 2444 \ 2445 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2446 "Run periodic metaspace verifications (0 - none, " \ 2447 "1 - always, >1 every nth interval)") \ 2448 \ 2449 diagnostic(bool, ShowRegistersOnAssert, true, \ 2450 "On internal errors, include registers in error report.") \ 2451 \ 2452 diagnostic(bool, UseSwitchProfiling, true, \ 2453 "leverage profiling for table/lookup switch") \ 2454 \ 2455 develop(bool, TraceMemoryWriteback, false, \ 2456 "Trace memory writeback operations") \ 2457 \ 2458 JFR_ONLY(product(bool, FlightRecorder, false, \ 2459 "(Deprecated) Enable Flight Recorder")) \ 2460 \ 2461 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2462 "Flight Recorder options")) \ 2463 \ 2464 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2465 "Start flight recording with options")) \ 2466 \ 2467 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2468 "Use platform unstable time where supported for timestamps only") \ 2469 \ 2470 product(bool, UseNewFieldLayout, true, \ 2471 "(Deprecated) Use new algorithm to compute field layouts") \ 2472 \ 2473 product(bool, UseEmptySlotsInSupers, true, \ 2474 "Allow allocating fields in empty slots of super-classes") \ 2475 \ 2476 diagnostic(bool, DeoptimizeNMethodBarriersALot, false, \ 2477 "Make nmethod barriers deoptimise a lot.") \ 2478 2479 // Interface macros 2480 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2481 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2482 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2483 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2484 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2485 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2486 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2487 #ifdef PRODUCT 2488 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2489 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2490 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2491 #else 2492 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2493 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2494 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2495 #endif // PRODUCT 2496 // Special LP64 flags, product only needed for now. 2497 #ifdef _LP64 2498 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2499 #else 2500 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2501 #endif // _LP64 2502 2503 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2504 DECLARE_PD_DEVELOPER_FLAG, \ 2505 DECLARE_PRODUCT_FLAG, \ 2506 DECLARE_PD_PRODUCT_FLAG, \ 2507 DECLARE_DIAGNOSTIC_FLAG, \ 2508 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2509 DECLARE_EXPERIMENTAL_FLAG, \ 2510 DECLARE_NOTPRODUCT_FLAG, \ 2511 DECLARE_MANAGEABLE_FLAG, \ 2512 DECLARE_PRODUCT_RW_FLAG, \ 2513 DECLARE_LP64_PRODUCT_FLAG, \ 2514 IGNORE_RANGE, \ 2515 IGNORE_CONSTRAINT) 2516 2517 #endif // SHARE_RUNTIME_GLOBALS_HPP