1 /* 2 * Copyright (c) 1997, 2019, 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 // writeable is a macro that controls if and how the value can change during the runtime 109 // 110 // writeable(Always) is optional and allows the flag to have its value changed 111 // without any limitations at any time 112 // 113 // writeable(Once) flag value's can be only set once during the lifetime of VM 114 // 115 // writeable(CommandLineOnly) flag value's can be only set from command line 116 // (multiple times allowed) 117 // 118 119 // Default and minimum StringTable and SymbolTable size values 120 // Must be powers of 2 121 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 122 const size_t minimumStringTableSize = 128; 123 const size_t defaultSymbolTableSize = 32768; // 2^15 124 const size_t minimumSymbolTableSize = 1024; 125 126 #define RUNTIME_FLAGS(develop, \ 127 develop_pd, \ 128 product, \ 129 product_pd, \ 130 diagnostic, \ 131 diagnostic_pd, \ 132 experimental, \ 133 notproduct, \ 134 manageable, \ 135 product_rw, \ 136 lp64_product, \ 137 range, \ 138 constraint, \ 139 writeable) \ 140 \ 141 lp64_product(bool, UseCompressedOops, false, \ 142 "Use 32-bit object references in 64-bit VM. " \ 143 "lp64_product means flag is always constant in 32 bit VM") \ 144 \ 145 lp64_product(bool, UseCompressedClassPointers, false, \ 146 "Use 32-bit class pointers in 64-bit VM. " \ 147 "lp64_product means flag is always constant in 32 bit VM") \ 148 \ 149 notproduct(bool, CheckCompressedOops, true, \ 150 "Generate checks in encoding/decoding code in debug VM") \ 151 \ 152 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 153 "Heap allocation steps through preferred address regions to find" \ 154 " where it can allocate the heap. Number of steps to take per " \ 155 "region.") \ 156 range(1, max_uintx) \ 157 \ 158 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 159 "Default object alignment in bytes, 8 is minimum") \ 160 range(8, 256) \ 161 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 162 \ 163 develop(bool, CleanChunkPoolAsync, true, \ 164 "Clean the chunk pool asynchronously") \ 165 \ 166 diagnostic(uint, HandshakeTimeout, 0, \ 167 "If nonzero set a timeout in milliseconds for handshakes") \ 168 \ 169 experimental(bool, AlwaysSafeConstructors, false, \ 170 "Force safe construction, as if all fields are final.") \ 171 \ 172 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 173 "Enable normal processing of flags relating to field diagnostics")\ 174 \ 175 experimental(bool, UnlockExperimentalVMOptions, false, \ 176 "Enable normal processing of flags relating to experimental " \ 177 "features") \ 178 \ 179 product(bool, JavaMonitorsInStackTrace, true, \ 180 "Print information about Java monitor locks when the stacks are" \ 181 "dumped") \ 182 \ 183 product_pd(bool, UseLargePages, \ 184 "Use large page memory") \ 185 \ 186 product_pd(bool, UseLargePagesIndividualAllocation, \ 187 "Allocate large pages individually for better affinity") \ 188 \ 189 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 190 "Fail large pages individual allocation") \ 191 \ 192 product(bool, UseLargePagesInMetaspace, false, \ 193 "Use large page memory in metaspace. " \ 194 "Only used if UseLargePages is enabled.") \ 195 \ 196 product(bool, UseNUMA, false, \ 197 "Use NUMA if available") \ 198 \ 199 product(bool, UseNUMAInterleaving, false, \ 200 "Interleave memory across NUMA nodes if available") \ 201 \ 202 product(size_t, NUMAInterleaveGranularity, 2*M, \ 203 "Granularity to use for NUMA interleaving on Windows OS") \ 204 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 205 \ 206 product(bool, ForceNUMA, false, \ 207 "Force NUMA optimizations on single-node/UMA systems") \ 208 \ 209 product(uintx, NUMAChunkResizeWeight, 20, \ 210 "Percentage (0-100) used to weight the current sample when " \ 211 "computing exponentially decaying average for " \ 212 "AdaptiveNUMAChunkSizing") \ 213 range(0, 100) \ 214 \ 215 product(size_t, NUMASpaceResizeRate, 1*G, \ 216 "Do not reallocate more than this amount per collection") \ 217 range(0, max_uintx) \ 218 \ 219 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 220 "Enable adaptive chunk sizing for NUMA") \ 221 \ 222 product(bool, NUMAStats, false, \ 223 "Print NUMA stats in detailed heap information") \ 224 \ 225 product(uintx, NUMAPageScanRate, 256, \ 226 "Maximum number of pages to include in the page scan procedure") \ 227 range(0, max_uintx) \ 228 \ 229 product(intx, UseSSE, 99, \ 230 "Highest supported SSE instructions set on x86/x64") \ 231 range(0, 99) \ 232 \ 233 product(bool, UseAES, false, \ 234 "Control whether AES instructions are used when available") \ 235 \ 236 product(bool, UseFMA, false, \ 237 "Control whether FMA instructions are used when available") \ 238 \ 239 product(bool, UseSHA, false, \ 240 "Control whether SHA instructions are used when available") \ 241 \ 242 diagnostic(bool, UseGHASHIntrinsics, false, \ 243 "Use intrinsics for GHASH versions of crypto") \ 244 \ 245 product(bool, UseBASE64Intrinsics, false, \ 246 "Use intrinsics for java.util.Base64") \ 247 \ 248 product(size_t, LargePageSizeInBytes, 0, \ 249 "Large page size (0 to let VM choose the page size)") \ 250 range(0, max_uintx) \ 251 \ 252 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 253 "Use large pages if maximum heap is at least this big") \ 254 range(0, max_uintx) \ 255 \ 256 product(bool, ForceTimeHighResolution, false, \ 257 "Using high time resolution (for Win32 only)") \ 258 \ 259 develop(bool, TracePcPatching, false, \ 260 "Trace usage of frame::patch_pc") \ 261 \ 262 develop(bool, TraceRelocator, false, \ 263 "Trace the bytecode relocator") \ 264 \ 265 develop(bool, TraceLongCompiles, false, \ 266 "Print out every time compilation is longer than " \ 267 "a given threshold") \ 268 \ 269 diagnostic(bool, SafepointALot, false, \ 270 "Generate a lot of safepoints. This works with " \ 271 "GuaranteedSafepointInterval") \ 272 \ 273 diagnostic(bool, HandshakeALot, false, \ 274 "Generate a lot of handshakes. This works with " \ 275 "GuaranteedSafepointInterval") \ 276 \ 277 product_pd(bool, BackgroundCompilation, \ 278 "A thread requesting compilation is not blocked during " \ 279 "compilation") \ 280 \ 281 product(bool, PrintVMQWaitTime, false, \ 282 "Print out the waiting time in VM operation queue") \ 283 \ 284 product(bool, MethodFlushing, true, \ 285 "Reclamation of zombie and not-entrant methods") \ 286 \ 287 develop(bool, VerifyStack, false, \ 288 "Verify stack of each thread when it is entering a runtime call") \ 289 \ 290 diagnostic(bool, ForceUnreachable, false, \ 291 "Make all non code cache addresses to be unreachable by " \ 292 "forcing use of 64bit literal fixups") \ 293 \ 294 notproduct(bool, StressDerivedPointers, false, \ 295 "Force scavenge when a derived pointer is detected on stack " \ 296 "after rtm call") \ 297 \ 298 develop(bool, TraceDerivedPointers, false, \ 299 "Trace traversal of derived pointers on stack") \ 300 \ 301 notproduct(bool, TraceCodeBlobStacks, false, \ 302 "Trace stack-walk of codeblobs") \ 303 \ 304 notproduct(bool, PrintRewrites, false, \ 305 "Print methods that are being rewritten") \ 306 \ 307 product(bool, UseInlineCaches, true, \ 308 "Use Inline Caches for virtual calls ") \ 309 \ 310 diagnostic(bool, InlineArrayCopy, true, \ 311 "Inline arraycopy native that is known to be part of " \ 312 "base library DLL") \ 313 \ 314 diagnostic(bool, InlineObjectHash, true, \ 315 "Inline Object::hashCode() native that is known to be part " \ 316 "of base library DLL") \ 317 \ 318 diagnostic(bool, InlineNatives, true, \ 319 "Inline natives that are known to be part of base library DLL") \ 320 \ 321 diagnostic(bool, InlineMathNatives, true, \ 322 "Inline SinD, CosD, etc.") \ 323 \ 324 diagnostic(bool, InlineClassNatives, true, \ 325 "Inline Class.isInstance, etc") \ 326 \ 327 diagnostic(bool, InlineThreadNatives, true, \ 328 "Inline Thread.currentThread, etc") \ 329 \ 330 diagnostic(bool, InlineUnsafeOps, true, \ 331 "Inline memory ops (native methods) from Unsafe") \ 332 \ 333 product(bool, CriticalJNINatives, true, \ 334 "Check for critical JNI entry points") \ 335 \ 336 notproduct(bool, StressCriticalJNINatives, false, \ 337 "Exercise register saving code in critical natives") \ 338 \ 339 diagnostic(bool, UseAESIntrinsics, false, \ 340 "Use intrinsics for AES versions of crypto") \ 341 \ 342 diagnostic(bool, UseAESCTRIntrinsics, false, \ 343 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 344 \ 345 diagnostic(bool, UseSHA1Intrinsics, false, \ 346 "Use intrinsics for SHA-1 crypto hash function. " \ 347 "Requires that UseSHA is enabled.") \ 348 \ 349 diagnostic(bool, UseSHA256Intrinsics, false, \ 350 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 351 "Requires that UseSHA is enabled.") \ 352 \ 353 diagnostic(bool, UseSHA512Intrinsics, false, \ 354 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 355 "Requires that UseSHA is enabled.") \ 356 \ 357 diagnostic(bool, UseCRC32Intrinsics, false, \ 358 "use intrinsics for java.util.zip.CRC32") \ 359 \ 360 diagnostic(bool, UseCRC32CIntrinsics, false, \ 361 "use intrinsics for java.util.zip.CRC32C") \ 362 \ 363 diagnostic(bool, UseAdler32Intrinsics, false, \ 364 "use intrinsics for java.util.zip.Adler32") \ 365 \ 366 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 367 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 368 \ 369 diagnostic(ccstrlist, DisableIntrinsic, "", \ 370 "do not expand intrinsics whose (internal) names appear here") \ 371 \ 372 develop(bool, TraceCallFixup, false, \ 373 "Trace all call fixups") \ 374 \ 375 develop(bool, DeoptimizeALot, false, \ 376 "Deoptimize at every exit from the runtime system") \ 377 \ 378 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 379 "A comma separated list of bcis to deoptimize at") \ 380 \ 381 develop(bool, DeoptimizeRandom, false, \ 382 "Deoptimize random frames on random exit from the runtime system")\ 383 \ 384 notproduct(bool, ZombieALot, false, \ 385 "Create zombies (non-entrant) at exit from the runtime system") \ 386 \ 387 notproduct(bool, WalkStackALot, false, \ 388 "Trace stack (no print) at every exit from the runtime system") \ 389 \ 390 product(bool, Debugging, false, \ 391 "Set when executing debug methods in debug.cpp " \ 392 "(to prevent triggering assertions)") \ 393 \ 394 notproduct(bool, VerifyLastFrame, false, \ 395 "Verify oops on last frame on entry to VM") \ 396 \ 397 product(bool, SafepointTimeout, false, \ 398 "Time out and warn or fail after SafepointTimeoutDelay " \ 399 "milliseconds if failed to reach safepoint") \ 400 \ 401 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 402 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 403 \ 404 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 405 "Abort upon failure to complete VM operation promptly") \ 406 \ 407 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 408 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 409 range(0, max_intx) \ 410 \ 411 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 412 /* typically, at most a few retries are needed */ \ 413 product(intx, SuspendRetryCount, 50, \ 414 "Maximum retry count for an external suspend request") \ 415 range(0, max_intx) \ 416 \ 417 product(intx, SuspendRetryDelay, 5, \ 418 "Milliseconds to delay per retry (* current_retry_count)") \ 419 range(0, max_intx) \ 420 \ 421 product(bool, AssertOnSuspendWaitFailure, false, \ 422 "Assert/Guarantee on external suspend wait failure") \ 423 \ 424 product(bool, TraceSuspendWaitFailures, false, \ 425 "Trace external suspend wait failures") \ 426 \ 427 product(bool, MaxFDLimit, true, \ 428 "Bump the number of file descriptors to maximum in Solaris") \ 429 \ 430 diagnostic(bool, LogEvents, true, \ 431 "Enable the various ring buffer event logs") \ 432 \ 433 diagnostic(uintx, LogEventsBufferEntries, 20, \ 434 "Number of ring buffer event logs") \ 435 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 436 \ 437 diagnostic(bool, BytecodeVerificationRemote, true, \ 438 "Enable the Java bytecode verifier for remote classes") \ 439 \ 440 diagnostic(bool, BytecodeVerificationLocal, false, \ 441 "Enable the Java bytecode verifier for local classes") \ 442 \ 443 develop(bool, ForceFloatExceptions, trueInDebug, \ 444 "Force exceptions on FP stack under/overflow") \ 445 \ 446 develop(bool, VerifyStackAtCalls, false, \ 447 "Verify that the stack pointer is unchanged after calls") \ 448 \ 449 develop(bool, TraceJavaAssertions, false, \ 450 "Trace java language assertions") \ 451 \ 452 notproduct(bool, VerifyCodeCache, false, \ 453 "Verify code cache on memory allocation/deallocation") \ 454 \ 455 develop(bool, UseMallocOnly, false, \ 456 "Use only malloc/free for allocation (no resource area/arena)") \ 457 \ 458 develop(bool, ZapResourceArea, trueInDebug, \ 459 "Zap freed resource/arena space with 0xABABABAB") \ 460 \ 461 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 462 "Zap freed VM handle space with 0xBCBCBCBC") \ 463 \ 464 notproduct(bool, ZapStackSegments, trueInDebug, \ 465 "Zap allocated/freed stack segments with 0xFADFADED") \ 466 \ 467 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 468 "Zap unused heap space with 0xBAADBABE") \ 469 \ 470 develop(bool, CheckZapUnusedHeapArea, false, \ 471 "Check zapping of unused heap space") \ 472 \ 473 develop(bool, ZapFillerObjects, trueInDebug, \ 474 "Zap filler objects with 0xDEAFBABE") \ 475 \ 476 develop(bool, PrintVMMessages, true, \ 477 "Print VM messages on console") \ 478 \ 479 notproduct(uintx, ErrorHandlerTest, 0, \ 480 "If > 0, provokes an error after VM initialization; the value " \ 481 "determines which error to provoke. See test_error_handler() " \ 482 "in vmError.cpp.") \ 483 \ 484 notproduct(uintx, TestCrashInErrorHandler, 0, \ 485 "If > 0, provokes an error inside VM error handler (a secondary " \ 486 "crash). see test_error_handler() in vmError.cpp") \ 487 \ 488 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 489 "If true, tests SafeFetch inside error handler.") \ 490 \ 491 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 492 "If true, simulates an unresponsive error handler.") \ 493 \ 494 develop(bool, Verbose, false, \ 495 "Print additional debugging information from other modes") \ 496 \ 497 develop(bool, PrintMiscellaneous, false, \ 498 "Print uncategorized debugging information (requires +Verbose)") \ 499 \ 500 develop(bool, WizardMode, false, \ 501 "Print much more debugging information") \ 502 \ 503 product(bool, ShowMessageBoxOnError, false, \ 504 "Keep process alive on VM fatal error") \ 505 \ 506 product(bool, CreateCoredumpOnCrash, true, \ 507 "Create core/mini dump on VM fatal error") \ 508 \ 509 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 510 "Timeout, in seconds, to limit the time spent on writing an " \ 511 "error log in case of a crash.") \ 512 range(0, (uint64_t)max_jlong/1000) \ 513 \ 514 product_pd(bool, UseOSErrorReporting, \ 515 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 516 \ 517 product(bool, SuppressFatalErrorMessage, false, \ 518 "Report NO fatal error message (avoid deadlock)") \ 519 \ 520 product(ccstrlist, OnError, "", \ 521 "Run user-defined commands on fatal error; see VMError.cpp " \ 522 "for examples") \ 523 \ 524 product(ccstrlist, OnOutOfMemoryError, "", \ 525 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 526 \ 527 manageable(bool, HeapDumpBeforeFullGC, false, \ 528 "Dump heap to file before any major stop-the-world GC") \ 529 \ 530 manageable(bool, HeapDumpAfterFullGC, false, \ 531 "Dump heap to file after any major stop-the-world GC") \ 532 \ 533 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 534 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 535 \ 536 manageable(ccstr, HeapDumpPath, NULL, \ 537 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 538 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 539 "in the working directory)") \ 540 \ 541 develop(bool, BreakAtWarning, false, \ 542 "Execute breakpoint upon encountering VM warning") \ 543 \ 544 product(ccstr, NativeMemoryTracking, "off", \ 545 "Native memory tracking options") \ 546 \ 547 diagnostic(bool, PrintNMTStatistics, false, \ 548 "Print native memory tracking summary data if it is on") \ 549 \ 550 diagnostic(bool, LogCompilation, false, \ 551 "Log compilation activity in detail to LogFile") \ 552 \ 553 product(bool, PrintCompilation, false, \ 554 "Print compilations") \ 555 \ 556 product(bool, PrintExtendedThreadInfo, false, \ 557 "Print more information in thread dump") \ 558 \ 559 diagnostic(intx, ScavengeRootsInCode, 2, \ 560 "0: do not allow scavengable oops in the code cache; " \ 561 "1: allow scavenging from the code cache; " \ 562 "2: emit as many constants as the compiler can see") \ 563 range(0, 2) \ 564 \ 565 product(bool, AlwaysRestoreFPU, false, \ 566 "Restore the FPU control word after every JNI call (expensive)") \ 567 \ 568 diagnostic(bool, PrintCompilation2, false, \ 569 "Print additional statistics per compilation") \ 570 \ 571 diagnostic(bool, PrintAdapterHandlers, false, \ 572 "Print code generated for i2c/c2i adapters") \ 573 \ 574 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 575 "Verify that i2c/c2i adapters are called properly") \ 576 \ 577 develop(bool, VerifyAdapterSharing, false, \ 578 "Verify that the code for shared adapters is the equivalent") \ 579 \ 580 diagnostic(bool, PrintAssembly, false, \ 581 "Print assembly code (using external disassembler.so)") \ 582 \ 583 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 584 "Print options string passed to disassembler.so") \ 585 \ 586 notproduct(bool, PrintNMethodStatistics, false, \ 587 "Print a summary statistic for the generated nmethods") \ 588 \ 589 diagnostic(bool, PrintNMethods, false, \ 590 "Print assembly code for nmethods when generated") \ 591 \ 592 diagnostic(bool, PrintNativeNMethods, false, \ 593 "Print assembly code for native nmethods when generated") \ 594 \ 595 develop(bool, PrintDebugInfo, false, \ 596 "Print debug information for all nmethods when generated") \ 597 \ 598 develop(bool, PrintRelocations, false, \ 599 "Print relocation information for all nmethods when generated") \ 600 \ 601 develop(bool, PrintDependencies, false, \ 602 "Print dependency information for all nmethods when generated") \ 603 \ 604 develop(bool, PrintExceptionHandlers, false, \ 605 "Print exception handler tables for all nmethods when generated") \ 606 \ 607 develop(bool, StressCompiledExceptionHandlers, false, \ 608 "Exercise compiled exception handlers") \ 609 \ 610 develop(bool, InterceptOSException, false, \ 611 "Start debugger when an implicit OS (e.g. NULL) " \ 612 "exception happens") \ 613 \ 614 product(bool, PrintCodeCache, false, \ 615 "Print the code cache memory usage when exiting") \ 616 \ 617 develop(bool, PrintCodeCache2, false, \ 618 "Print detailed usage information on the code cache when exiting")\ 619 \ 620 product(bool, PrintCodeCacheOnCompilation, false, \ 621 "Print the code cache memory usage each time a method is " \ 622 "compiled") \ 623 \ 624 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 625 "Print code heap usage statistics on exit and on full condition") \ 626 \ 627 diagnostic(bool, PrintStubCode, false, \ 628 "Print generated stub code") \ 629 \ 630 product(bool, StackTraceInThrowable, true, \ 631 "Collect backtrace in throwable when exception happens") \ 632 \ 633 product(bool, OmitStackTraceInFastThrow, true, \ 634 "Omit backtraces for some 'hot' exceptions in optimized code") \ 635 \ 636 manageable(bool, ShowCodeDetailsInExceptionMessages, false, \ 637 "Show exception messages from RuntimeExceptions that contain " \ 638 "snippets of the failing code. Disable this to improve privacy.") \ 639 \ 640 product(bool, PrintWarnings, true, \ 641 "Print JVM warnings to output stream") \ 642 \ 643 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 644 "Print warnings for stalled SpinLocks") \ 645 \ 646 product(bool, RegisterFinalizersAtInit, true, \ 647 "Register finalizable objects at end of Object.<init> or " \ 648 "after allocation") \ 649 \ 650 develop(bool, RegisterReferences, true, \ 651 "Tell whether the VM should register soft/weak/final/phantom " \ 652 "references") \ 653 \ 654 develop(bool, IgnoreRewrites, false, \ 655 "Suppress rewrites of bytecodes in the oopmap generator. " \ 656 "This is unsafe!") \ 657 \ 658 develop(bool, PrintCodeCacheExtension, false, \ 659 "Print extension of code cache") \ 660 \ 661 develop(bool, UsePrivilegedStack, true, \ 662 "Enable the security JVM functions") \ 663 \ 664 develop(bool, ProtectionDomainVerification, true, \ 665 "Verify protection domain before resolution in system dictionary")\ 666 \ 667 product(bool, ClassUnloading, true, \ 668 "Do unloading of classes") \ 669 \ 670 product(bool, ClassUnloadingWithConcurrentMark, true, \ 671 "Do unloading of classes with a concurrent marking cycle") \ 672 \ 673 develop(bool, DisableStartThread, false, \ 674 "Disable starting of additional Java threads " \ 675 "(for debugging only)") \ 676 \ 677 develop(bool, MemProfiling, false, \ 678 "Write memory usage profiling to log file") \ 679 \ 680 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 681 "Print the system dictionary at exit") \ 682 \ 683 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 684 "Dynamically resize system dictionaries as needed") \ 685 \ 686 product(bool, AlwaysLockClassLoader, false, \ 687 "Require the VM to acquire the class loader lock before calling " \ 688 "loadClass() even for class loaders registering " \ 689 "as parallel capable") \ 690 \ 691 product(bool, AllowParallelDefineClass, false, \ 692 "Allow parallel defineClass requests for class loaders " \ 693 "registering as parallel capable") \ 694 \ 695 product_pd(bool, DontYieldALot, \ 696 "Throw away obvious excess yield calls") \ 697 \ 698 develop(bool, UseDetachedThreads, true, \ 699 "Use detached threads that are recycled upon termination " \ 700 "(for Solaris only)") \ 701 \ 702 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 703 "Disable the use of stack guard pages if the JVM is loaded " \ 704 "on the primordial process thread") \ 705 \ 706 product(bool, UseLWPSynchronization, true, \ 707 "Use LWP-based instead of libthread-based synchronization " \ 708 "(SPARC only)") \ 709 \ 710 product(intx, MonitorBound, 0, "(Deprecated) Bound Monitor population") \ 711 range(0, max_jint) \ 712 \ 713 diagnostic(bool, AsyncDeflateIdleMonitors, true, \ 714 "Deflate idle monitors using the ServiceThread.") \ 715 \ 716 /* notice: the max range value here is max_jint, not max_intx */ \ 717 /* because of overflow issue */ \ 718 diagnostic(intx, AsyncDeflationInterval, 250, \ 719 "Async deflate idle monitors every so many milliseconds when " \ 720 "MonitorUsedDeflationThreshold is exceeded (0 is off).") \ 721 range(0, max_jint) \ 722 \ 723 diagnostic_pd(bool, HandshakeAfterDeflateIdleMonitors, \ 724 "Handshake with all JavaThreads after async deflating idle " \ 725 "monitors to force threads to leave C2 monitor code.") \ 726 \ 727 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 728 "Percentage of used monitors before triggering deflation (0 is " \ 729 "off). The check is performed on GuaranteedSafepointInterval " \ 730 "or AsyncDeflateInterval.") \ 731 range(0, 100) \ 732 \ 733 experimental(intx, hashCode, 5, \ 734 "(Unstable) select hashCode generation algorithm") \ 735 \ 736 product(bool, FilterSpuriousWakeups, true, \ 737 "When true prevents OS-level spurious, or premature, wakeups " \ 738 "from Object.wait (Ignored for Windows)") \ 739 \ 740 develop(bool, UsePthreads, false, \ 741 "Use pthread-based instead of libthread-based synchronization " \ 742 "(SPARC only)") \ 743 \ 744 product(bool, ReduceSignalUsage, false, \ 745 "Reduce the use of OS signals in Java and/or the VM") \ 746 \ 747 develop(bool, LoadLineNumberTables, true, \ 748 "Tell whether the class file parser loads line number tables") \ 749 \ 750 develop(bool, LoadLocalVariableTables, true, \ 751 "Tell whether the class file parser loads local variable tables") \ 752 \ 753 develop(bool, LoadLocalVariableTypeTables, true, \ 754 "Tell whether the class file parser loads local variable type" \ 755 "tables") \ 756 \ 757 product(bool, AllowUserSignalHandlers, false, \ 758 "Do not complain if the application installs signal handlers " \ 759 "(Solaris & Linux only)") \ 760 \ 761 product(bool, UseSignalChaining, true, \ 762 "Use signal-chaining to invoke signal handlers installed " \ 763 "by the application (Solaris & Linux only)") \ 764 \ 765 product(bool, RestoreMXCSROnJNICalls, false, \ 766 "Restore MXCSR when returning from JNI calls") \ 767 \ 768 product(bool, CheckJNICalls, false, \ 769 "Verify all arguments to JNI calls") \ 770 \ 771 product(bool, UseFastJNIAccessors, true, \ 772 "Use optimized versions of Get<Primitive>Field") \ 773 \ 774 product(intx, MaxJNILocalCapacity, 65536, \ 775 "Maximum allowable local JNI handle capacity to " \ 776 "EnsureLocalCapacity() and PushLocalFrame(), " \ 777 "where <= 0 is unlimited, default: 65536") \ 778 range(min_intx, max_intx) \ 779 \ 780 product(bool, EagerXrunInit, false, \ 781 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 782 "but not all -Xrun libraries may support the state of the VM " \ 783 "at this time") \ 784 \ 785 product(bool, PreserveAllAnnotations, false, \ 786 "Preserve RuntimeInvisibleAnnotations as well " \ 787 "as RuntimeVisibleAnnotations") \ 788 \ 789 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 790 "Number of OutOfMemoryErrors preallocated with backtrace") \ 791 \ 792 product(bool, UseXMMForArrayCopy, false, \ 793 "Use SSE2 MOVQ instruction for Arraycopy") \ 794 \ 795 product(intx, FieldsAllocationStyle, 1, \ 796 "(Deprecated) 0 - type based with oops first, " \ 797 "1 - with oops last, " \ 798 "2 - oops in super and sub classes are together") \ 799 range(0, 2) \ 800 \ 801 product(bool, CompactFields, true, \ 802 "(Deprecated) Allocate nonstatic fields in gaps " \ 803 "between previous fields") \ 804 \ 805 notproduct(bool, PrintFieldLayout, false, \ 806 "Print field layout for each class") \ 807 \ 808 /* Need to limit the extent of the padding to reasonable size. */\ 809 /* 8K is well beyond the reasonable HW cache line size, even with */\ 810 /* aggressive prefetching, while still leaving the room for segregating */\ 811 /* among the distinct pages. */\ 812 product(intx, ContendedPaddingWidth, 128, \ 813 "How many bytes to pad the fields/classes marked @Contended with")\ 814 range(0, 8192) \ 815 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 816 \ 817 product(bool, EnableContended, true, \ 818 "Enable @Contended annotation support") \ 819 \ 820 product(bool, RestrictContended, true, \ 821 "Restrict @Contended to trusted classes") \ 822 \ 823 product(bool, UseBiasedLocking, true, \ 824 "Enable biased locking in JVM") \ 825 \ 826 product(intx, BiasedLockingStartupDelay, 0, \ 827 "Number of milliseconds to wait before enabling biased locking") \ 828 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 829 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 830 \ 831 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 832 "Print statistics of biased locking in JVM") \ 833 \ 834 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 835 "Threshold of number of revocations per type to try to " \ 836 "rebias all objects in the heap of that type") \ 837 range(0, max_intx) \ 838 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 839 \ 840 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 841 "Threshold of number of revocations per type to permanently " \ 842 "revoke biases of all objects in the heap of that type") \ 843 range(0, max_intx) \ 844 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 845 \ 846 product(intx, BiasedLockingDecayTime, 25000, \ 847 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 848 "type after previous bulk rebias") \ 849 range(500, max_intx) \ 850 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 851 \ 852 product(bool, ExitOnOutOfMemoryError, false, \ 853 "JVM exits on the first occurrence of an out-of-memory error") \ 854 \ 855 product(bool, CrashOnOutOfMemoryError, false, \ 856 "JVM aborts, producing an error log and core/mini dump, on the " \ 857 "first occurrence of an out-of-memory error") \ 858 \ 859 /* tracing */ \ 860 \ 861 develop(bool, StressRewriter, false, \ 862 "Stress linktime bytecode rewriting") \ 863 \ 864 product(ccstr, TraceJVMTI, NULL, \ 865 "Trace flags for JVMTI functions and events") \ 866 \ 867 /* This option can change an EMCP method into an obsolete method. */ \ 868 /* This can affect tests that except specific methods to be EMCP. */ \ 869 /* This option should be used with caution. */ \ 870 product(bool, StressLdcRewrite, false, \ 871 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 872 \ 873 /* change to false by default sometime after Mustang */ \ 874 product(bool, VerifyMergedCPBytecodes, true, \ 875 "Verify bytecodes after RedefineClasses constant pool merging") \ 876 \ 877 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 878 "(Deprecated) Allow redefinition to add and delete private " \ 879 "static or final methods for compatibility with old releases") \ 880 \ 881 develop(bool, TraceBytecodes, false, \ 882 "Trace bytecode execution") \ 883 \ 884 develop(bool, TraceICs, false, \ 885 "Trace inline cache changes") \ 886 \ 887 notproduct(bool, TraceInvocationCounterOverflow, false, \ 888 "Trace method invocation counter overflow") \ 889 \ 890 develop(bool, TraceInlineCacheClearing, false, \ 891 "Trace clearing of inline caches in nmethods") \ 892 \ 893 develop(bool, TraceDependencies, false, \ 894 "Trace dependencies") \ 895 \ 896 develop(bool, VerifyDependencies, trueInDebug, \ 897 "Exercise and verify the compilation dependency mechanism") \ 898 \ 899 develop(bool, TraceNewOopMapGeneration, false, \ 900 "Trace OopMapGeneration") \ 901 \ 902 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 903 "Trace OopMapGeneration: print detailed cell states") \ 904 \ 905 develop(bool, TimeOopMap, false, \ 906 "Time calls to GenerateOopMap::compute_map() in sum") \ 907 \ 908 develop(bool, TimeOopMap2, false, \ 909 "Time calls to GenerateOopMap::compute_map() individually") \ 910 \ 911 develop(bool, TraceOopMapRewrites, false, \ 912 "Trace rewriting of method oops during oop map generation") \ 913 \ 914 develop(bool, TraceICBuffer, false, \ 915 "Trace usage of IC buffer") \ 916 \ 917 develop(bool, TraceCompiledIC, false, \ 918 "Trace changes of compiled IC") \ 919 \ 920 develop(bool, FLSVerifyDictionary, false, \ 921 "Do lots of (expensive) FLS dictionary verification") \ 922 \ 923 \ 924 notproduct(bool, CheckMemoryInitialization, false, \ 925 "Check memory initialization") \ 926 \ 927 product(uintx, ProcessDistributionStride, 4, \ 928 "Stride through processors when distributing processes") \ 929 range(0, max_juint) \ 930 \ 931 develop(bool, TraceFinalizerRegistration, false, \ 932 "Trace registration of final references") \ 933 \ 934 product(bool, IgnoreEmptyClassPaths, false, \ 935 "Ignore empty path elements in -classpath") \ 936 \ 937 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 938 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 939 "Initial size of the boot class loader data metaspace") \ 940 range(30*K, max_uintx/BytesPerWord) \ 941 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 942 \ 943 product(bool, PrintHeapAtSIGBREAK, true, \ 944 "Print heap layout in response to SIGBREAK") \ 945 \ 946 manageable(bool, PrintClassHistogram, false, \ 947 "Print a histogram of class instances") \ 948 \ 949 experimental(double, ObjectCountCutOffPercent, 0.5, \ 950 "The percentage of the used heap that the instances of a class " \ 951 "must occupy for the class to generate a trace event") \ 952 range(0.0, 100.0) \ 953 \ 954 /* JVMTI heap profiling */ \ 955 \ 956 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 957 "Trace JVMTI object tagging calls") \ 958 \ 959 diagnostic(bool, VerifyBeforeIteration, false, \ 960 "Verify memory system before JVMTI iteration") \ 961 \ 962 /* compiler interface */ \ 963 \ 964 develop(bool, CIPrintCompilerName, false, \ 965 "when CIPrint is active, print the name of the active compiler") \ 966 \ 967 diagnostic(bool, CIPrintCompileQueue, false, \ 968 "display the contents of the compile queue whenever a " \ 969 "compilation is enqueued") \ 970 \ 971 develop(bool, CIPrintRequests, false, \ 972 "display every request for compilation") \ 973 \ 974 product(bool, CITime, false, \ 975 "collect timing information for compilation") \ 976 \ 977 develop(bool, CITimeVerbose, false, \ 978 "be more verbose in compilation timings") \ 979 \ 980 develop(bool, CITimeEach, false, \ 981 "display timing information after each successful compilation") \ 982 \ 983 develop(bool, CICountOSR, false, \ 984 "use a separate counter when assigning ids to osr compilations") \ 985 \ 986 develop(bool, CICompileNatives, true, \ 987 "compile native methods if supported by the compiler") \ 988 \ 989 develop_pd(bool, CICompileOSR, \ 990 "compile on stack replacement methods if supported by the " \ 991 "compiler") \ 992 \ 993 develop(bool, CIPrintMethodCodes, false, \ 994 "print method bytecodes of the compiled code") \ 995 \ 996 develop(bool, CIPrintTypeFlow, false, \ 997 "print the results of ciTypeFlow analysis") \ 998 \ 999 develop(bool, CITraceTypeFlow, false, \ 1000 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 1001 \ 1002 develop(intx, OSROnlyBCI, -1, \ 1003 "OSR only at this bci. Negative values mean exclude that bci") \ 1004 \ 1005 /* compiler */ \ 1006 \ 1007 /* notice: the max range value here is max_jint, not max_intx */ \ 1008 /* because of overflow issue */ \ 1009 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 1010 "Number of compiler threads to run") \ 1011 range(0, max_jint) \ 1012 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 1013 \ 1014 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 1015 "Dynamically choose the number of parallel compiler threads") \ 1016 \ 1017 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 1018 "Reduce the number of parallel compiler threads when they " \ 1019 "are not used") \ 1020 \ 1021 diagnostic(bool, TraceCompilerThreads, false, \ 1022 "Trace creation and removal of compiler threads") \ 1023 \ 1024 develop(bool, InjectCompilerCreationFailure, false, \ 1025 "Inject thread creation failures for " \ 1026 "UseDynamicNumberOfCompilerThreads") \ 1027 \ 1028 develop(bool, UseStackBanging, true, \ 1029 "use stack banging for stack overflow checks (required for " \ 1030 "proper StackOverflow handling; disable only to measure cost " \ 1031 "of stackbanging)") \ 1032 \ 1033 develop(bool, UseStrictFP, true, \ 1034 "use strict fp if modifier strictfp is set") \ 1035 \ 1036 develop(bool, GenerateSynchronizationCode, true, \ 1037 "generate locking/unlocking code for synchronized methods and " \ 1038 "monitors") \ 1039 \ 1040 develop(bool, GenerateRangeChecks, true, \ 1041 "Generate range checks for array accesses") \ 1042 \ 1043 diagnostic_pd(bool, ImplicitNullChecks, \ 1044 "Generate code for implicit null checks") \ 1045 \ 1046 product_pd(bool, TrapBasedNullChecks, \ 1047 "Generate code for null checks that uses a cmp and trap " \ 1048 "instruction raising SIGTRAP. This is only used if an access to" \ 1049 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1050 "ImplicitNullChecks don't work (PPC64).") \ 1051 \ 1052 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1053 "Enable Thread SMR extra validity checks") \ 1054 \ 1055 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1056 "Enable Thread SMR Statistics") \ 1057 \ 1058 product(bool, UseNotificationThread, true, \ 1059 "Use Notification Thread") \ 1060 \ 1061 product(bool, Inline, true, \ 1062 "Enable inlining") \ 1063 \ 1064 product(bool, ClipInlining, true, \ 1065 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1066 \ 1067 develop(bool, UseCHA, true, \ 1068 "Enable CHA") \ 1069 \ 1070 product(bool, UseTypeProfile, true, \ 1071 "Check interpreter profile for historically monomorphic calls") \ 1072 \ 1073 diagnostic(bool, PrintInlining, false, \ 1074 "Print inlining optimizations") \ 1075 \ 1076 product(bool, UsePopCountInstruction, false, \ 1077 "Use population count instruction") \ 1078 \ 1079 develop(bool, EagerInitialization, false, \ 1080 "Eagerly initialize classes if possible") \ 1081 \ 1082 diagnostic(bool, LogTouchedMethods, false, \ 1083 "Log methods which have been ever touched in runtime") \ 1084 \ 1085 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1086 "Print all methods that have been ever touched in runtime") \ 1087 \ 1088 develop(bool, TraceMethodReplacement, false, \ 1089 "Print when methods are replaced do to recompilation") \ 1090 \ 1091 develop(bool, PrintMethodFlushing, false, \ 1092 "Print the nmethods being flushed") \ 1093 \ 1094 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1095 "print statistics about method flushing") \ 1096 \ 1097 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1098 "Number of compiled code invocations after which " \ 1099 "the method is considered as hot by the flusher") \ 1100 range(1, max_jint) \ 1101 \ 1102 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1103 "Minimum number of sweeper passes before an nmethod " \ 1104 "can be flushed") \ 1105 range(0, max_intx) \ 1106 \ 1107 product(bool, UseCodeAging, true, \ 1108 "Insert counter to detect warm methods") \ 1109 \ 1110 diagnostic(bool, StressCodeAging, false, \ 1111 "Start with counters compiled in") \ 1112 \ 1113 develop(bool, StressCodeBuffers, false, \ 1114 "Exercise code buffer expansion and other rare state changes") \ 1115 \ 1116 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1117 "Generate extra debugging information for non-safepoints in " \ 1118 "nmethods") \ 1119 \ 1120 product(bool, PrintVMOptions, false, \ 1121 "Print flags that appeared on the command line") \ 1122 \ 1123 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1124 "Ignore unrecognized VM options") \ 1125 \ 1126 product(bool, PrintCommandLineFlags, false, \ 1127 "Print flags specified on command line or set by ergonomics") \ 1128 \ 1129 product(bool, PrintFlagsInitial, false, \ 1130 "Print all VM flags before argument processing and exit VM") \ 1131 \ 1132 product(bool, PrintFlagsFinal, false, \ 1133 "Print all VM flags after argument and ergonomic processing") \ 1134 \ 1135 notproduct(bool, PrintFlagsWithComments, false, \ 1136 "Print all VM flags with default values and descriptions and " \ 1137 "exit") \ 1138 \ 1139 product(bool, PrintFlagsRanges, false, \ 1140 "Print VM flags and their ranges") \ 1141 \ 1142 diagnostic(bool, SerializeVMOutput, true, \ 1143 "Use a mutex to serialize output to tty and LogFile") \ 1144 \ 1145 diagnostic(bool, DisplayVMOutput, true, \ 1146 "Display all VM output on the tty, independently of LogVMOutput") \ 1147 \ 1148 diagnostic(bool, LogVMOutput, false, \ 1149 "Save VM output to LogFile") \ 1150 \ 1151 diagnostic(ccstr, LogFile, NULL, \ 1152 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1153 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1154 \ 1155 product(ccstr, ErrorFile, NULL, \ 1156 "If an error occurs, save the error data to this file " \ 1157 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1158 \ 1159 product(bool, ExtensiveErrorReports, \ 1160 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1161 "Error reports are more extensive.") \ 1162 \ 1163 product(bool, DisplayVMOutputToStderr, false, \ 1164 "If DisplayVMOutput is true, display all VM output to stderr") \ 1165 \ 1166 product(bool, DisplayVMOutputToStdout, false, \ 1167 "If DisplayVMOutput is true, display all VM output to stdout") \ 1168 \ 1169 product(bool, ErrorFileToStderr, false, \ 1170 "If true, error data is printed to stderr instead of a file") \ 1171 \ 1172 product(bool, ErrorFileToStdout, false, \ 1173 "If true, error data is printed to stdout instead of a file") \ 1174 \ 1175 product(bool, UseHeavyMonitors, false, \ 1176 "use heavyweight instead of lightweight Java monitors") \ 1177 \ 1178 product(bool, PrintStringTableStatistics, false, \ 1179 "print statistics about the StringTable and SymbolTable") \ 1180 \ 1181 diagnostic(bool, VerifyStringTableAtExit, false, \ 1182 "verify StringTable contents at exit") \ 1183 \ 1184 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1185 "print histogram of the symbol table") \ 1186 \ 1187 notproduct(bool, ExitVMOnVerifyError, false, \ 1188 "standard exit from VM if bytecode verify error " \ 1189 "(only in debug mode)") \ 1190 \ 1191 diagnostic(ccstr, AbortVMOnException, NULL, \ 1192 "Call fatal if this exception is thrown. Example: " \ 1193 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1194 \ 1195 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1196 "Call fatal if the exception pointed by AbortVMOnException " \ 1197 "has this message") \ 1198 \ 1199 develop(bool, DebugVtables, false, \ 1200 "add debugging code to vtable dispatch") \ 1201 \ 1202 notproduct(bool, PrintVtableStats, false, \ 1203 "print vtables stats at end of run") \ 1204 \ 1205 develop(bool, TraceCreateZombies, false, \ 1206 "trace creation of zombie nmethods") \ 1207 \ 1208 product(bool, RangeCheckElimination, true, \ 1209 "Eliminate range checks") \ 1210 \ 1211 develop_pd(bool, UncommonNullCast, \ 1212 "track occurrences of null in casts; adjust compiler tactics") \ 1213 \ 1214 develop(bool, TypeProfileCasts, true, \ 1215 "treat casts like calls for purposes of type profiling") \ 1216 \ 1217 develop(bool, TraceLivenessGen, false, \ 1218 "Trace the generation of liveness analysis information") \ 1219 \ 1220 notproduct(bool, TraceLivenessQuery, false, \ 1221 "Trace queries of liveness analysis information") \ 1222 \ 1223 notproduct(bool, CollectIndexSetStatistics, false, \ 1224 "Collect information about IndexSets") \ 1225 \ 1226 develop(bool, UseLoopSafepoints, true, \ 1227 "Generate Safepoint nodes in every loop") \ 1228 \ 1229 develop(intx, FastAllocateSizeLimit, 128*K, \ 1230 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1231 "Inline allocations larger than this in doublewords must go slow")\ 1232 \ 1233 product_pd(bool, CompactStrings, \ 1234 "Enable Strings to use single byte chars in backing store") \ 1235 \ 1236 product_pd(uintx, TypeProfileLevel, \ 1237 "=XYZ, with Z: Type profiling of arguments at call; " \ 1238 "Y: Type profiling of return value at call; " \ 1239 "X: Type profiling of parameters to methods; " \ 1240 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1241 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1242 \ 1243 product(intx, TypeProfileArgsLimit, 2, \ 1244 "max number of call arguments to consider for type profiling") \ 1245 range(0, 16) \ 1246 \ 1247 product(intx, TypeProfileParmsLimit, 2, \ 1248 "max number of incoming parameters to consider for type profiling"\ 1249 ", -1 for all") \ 1250 range(-1, 64) \ 1251 \ 1252 /* statistics */ \ 1253 develop(bool, CountCompiledCalls, false, \ 1254 "Count method invocations") \ 1255 \ 1256 notproduct(bool, CountRuntimeCalls, false, \ 1257 "Count VM runtime calls") \ 1258 \ 1259 develop(bool, CountJNICalls, false, \ 1260 "Count jni method invocations") \ 1261 \ 1262 notproduct(bool, CountJVMCalls, false, \ 1263 "Count jvm method invocations") \ 1264 \ 1265 notproduct(bool, CountRemovableExceptions, false, \ 1266 "Count exceptions that could be replaced by branches due to " \ 1267 "inlining") \ 1268 \ 1269 notproduct(bool, ICMissHistogram, false, \ 1270 "Produce histogram of IC misses") \ 1271 \ 1272 /* interpreter */ \ 1273 product_pd(bool, RewriteBytecodes, \ 1274 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1275 \ 1276 product_pd(bool, RewriteFrequentPairs, \ 1277 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1278 \ 1279 diagnostic(bool, PrintInterpreter, false, \ 1280 "Print the generated interpreter code") \ 1281 \ 1282 product(bool, UseInterpreter, true, \ 1283 "Use interpreter for non-compiled methods") \ 1284 \ 1285 develop(bool, UseFastSignatureHandlers, true, \ 1286 "Use fast signature handlers for native calls") \ 1287 \ 1288 product(bool, UseLoopCounter, true, \ 1289 "Increment invocation counter on backward branch") \ 1290 \ 1291 product_pd(bool, UseOnStackReplacement, \ 1292 "Use on stack replacement, calls runtime if invoc. counter " \ 1293 "overflows in loop") \ 1294 \ 1295 notproduct(bool, TraceOnStackReplacement, false, \ 1296 "Trace on stack replacement") \ 1297 \ 1298 product_pd(bool, PreferInterpreterNativeStubs, \ 1299 "Use always interpreter stubs for native methods invoked via " \ 1300 "interpreter") \ 1301 \ 1302 develop(bool, CountBytecodes, false, \ 1303 "Count number of bytecodes executed") \ 1304 \ 1305 develop(bool, PrintBytecodeHistogram, false, \ 1306 "Print histogram of the executed bytecodes") \ 1307 \ 1308 develop(bool, PrintBytecodePairHistogram, false, \ 1309 "Print histogram of the executed bytecode pairs") \ 1310 \ 1311 diagnostic(bool, PrintSignatureHandlers, false, \ 1312 "Print code generated for native method signature handlers") \ 1313 \ 1314 develop(bool, VerifyOops, false, \ 1315 "Do plausibility checks for oops") \ 1316 \ 1317 develop(bool, CheckUnhandledOops, false, \ 1318 "Check for unhandled oops in VM code") \ 1319 \ 1320 develop(bool, VerifyJNIFields, trueInDebug, \ 1321 "Verify jfieldIDs for instance fields") \ 1322 \ 1323 notproduct(bool, VerifyJNIEnvThread, false, \ 1324 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1325 "from JNI") \ 1326 \ 1327 develop(bool, VerifyFPU, false, \ 1328 "Verify FPU state (check for NaN's, etc.)") \ 1329 \ 1330 develop(bool, VerifyThread, false, \ 1331 "Watch the thread register for corruption (SPARC only)") \ 1332 \ 1333 develop(bool, VerifyActivationFrameSize, false, \ 1334 "Verify that activation frame didn't become smaller than its " \ 1335 "minimal size") \ 1336 \ 1337 develop(bool, TraceFrequencyInlining, false, \ 1338 "Trace frequency based inlining") \ 1339 \ 1340 develop_pd(bool, InlineIntrinsics, \ 1341 "Inline intrinsics that can be statically resolved") \ 1342 \ 1343 product_pd(bool, ProfileInterpreter, \ 1344 "Profile at the bytecode level during interpretation") \ 1345 \ 1346 develop(bool, TraceProfileInterpreter, false, \ 1347 "Trace profiling at the bytecode level during interpretation. " \ 1348 "This outputs the profiling information collected to improve " \ 1349 "jit compilation.") \ 1350 \ 1351 develop_pd(bool, ProfileTraps, \ 1352 "Profile deoptimization traps at the bytecode level") \ 1353 \ 1354 product(intx, ProfileMaturityPercentage, 20, \ 1355 "number of method invocations/branches (expressed as % of " \ 1356 "CompileThreshold) before using the method's profile") \ 1357 range(0, 100) \ 1358 \ 1359 diagnostic(bool, PrintMethodData, false, \ 1360 "Print the results of +ProfileInterpreter at end of run") \ 1361 \ 1362 develop(bool, VerifyDataPointer, trueInDebug, \ 1363 "Verify the method data pointer during interpreter profiling") \ 1364 \ 1365 develop(bool, VerifyCompiledCode, false, \ 1366 "Include miscellaneous runtime verifications in nmethod code; " \ 1367 "default off because it disturbs nmethod size heuristics") \ 1368 \ 1369 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1370 "Manually make GC thread crash then dump java stack trace; " \ 1371 "Test only") \ 1372 \ 1373 /* compilation */ \ 1374 product(bool, UseCompiler, true, \ 1375 "Use Just-In-Time compilation") \ 1376 \ 1377 product(bool, UseCounterDecay, true, \ 1378 "Adjust recompilation counters") \ 1379 \ 1380 develop(intx, CounterHalfLifeTime, 30, \ 1381 "Half-life time of invocation counters (in seconds)") \ 1382 \ 1383 develop(intx, CounterDecayMinIntervalLength, 500, \ 1384 "The minimum interval (in milliseconds) between invocation of " \ 1385 "CounterDecay") \ 1386 \ 1387 product(bool, AlwaysCompileLoopMethods, false, \ 1388 "When using recompilation, never interpret methods " \ 1389 "containing loops") \ 1390 \ 1391 product(bool, DontCompileHugeMethods, true, \ 1392 "Do not compile methods > HugeMethodLimit") \ 1393 \ 1394 /* Bytecode escape analysis estimation. */ \ 1395 product(bool, EstimateArgEscape, true, \ 1396 "Analyze bytecodes to estimate escape state of arguments") \ 1397 \ 1398 product(intx, BCEATraceLevel, 0, \ 1399 "How much tracing to do of bytecode escape analysis estimates " \ 1400 "(0-3)") \ 1401 range(0, 3) \ 1402 \ 1403 product(intx, MaxBCEAEstimateLevel, 5, \ 1404 "Maximum number of nested calls that are analyzed by BC EA") \ 1405 range(0, max_jint) \ 1406 \ 1407 product(intx, MaxBCEAEstimateSize, 150, \ 1408 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1409 range(0, max_jint) \ 1410 \ 1411 product(intx, AllocatePrefetchStyle, 1, \ 1412 "0 = no prefetch, " \ 1413 "1 = generate prefetch instructions for each allocation, " \ 1414 "2 = use TLAB watermark to gate allocation prefetch, " \ 1415 "3 = generate one prefetch instruction per cache line") \ 1416 range(0, 3) \ 1417 \ 1418 product(intx, AllocatePrefetchDistance, -1, \ 1419 "Distance to prefetch ahead of allocation pointer. " \ 1420 "-1: use system-specific value (automatically determined") \ 1421 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\ 1422 \ 1423 product(intx, AllocatePrefetchLines, 3, \ 1424 "Number of lines to prefetch ahead of array allocation pointer") \ 1425 range(1, 64) \ 1426 \ 1427 product(intx, AllocateInstancePrefetchLines, 1, \ 1428 "Number of lines to prefetch ahead of instance allocation " \ 1429 "pointer") \ 1430 range(1, 64) \ 1431 \ 1432 product(intx, AllocatePrefetchStepSize, 16, \ 1433 "Step size in bytes of sequential prefetch instructions") \ 1434 range(1, 512) \ 1435 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1436 \ 1437 product(intx, AllocatePrefetchInstr, 0, \ 1438 "Select instruction to prefetch ahead of allocation pointer") \ 1439 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1440 \ 1441 /* deoptimization */ \ 1442 develop(bool, TraceDeoptimization, false, \ 1443 "Trace deoptimization") \ 1444 \ 1445 develop(bool, PrintDeoptimizationDetails, false, \ 1446 "Print more information about deoptimization") \ 1447 \ 1448 develop(bool, DebugDeoptimization, false, \ 1449 "Tracing various information while debugging deoptimization") \ 1450 \ 1451 product(intx, SelfDestructTimer, 0, \ 1452 "Will cause VM to terminate after a given time (in minutes) " \ 1453 "(0 means off)") \ 1454 range(0, max_intx) \ 1455 \ 1456 product(intx, MaxJavaStackTraceDepth, 1024, \ 1457 "The maximum number of lines in the stack trace for Java " \ 1458 "exceptions (0 means all)") \ 1459 range(0, max_jint/2) \ 1460 \ 1461 /* notice: the max range value here is max_jint, not max_intx */ \ 1462 /* because of overflow issue */ \ 1463 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1464 "Guarantee a safepoint (at least) every so many milliseconds " \ 1465 "(0 means none)") \ 1466 range(0, max_jint) \ 1467 \ 1468 product(intx, SafepointTimeoutDelay, 10000, \ 1469 "Delay in milliseconds for option SafepointTimeout") \ 1470 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1471 NOT_LP64(range(0, max_intx)) \ 1472 \ 1473 product(intx, NmethodSweepActivity, 10, \ 1474 "Removes cold nmethods from code cache if > 0. Higher values " \ 1475 "result in more aggressive sweeping") \ 1476 range(0, 2000) \ 1477 \ 1478 notproduct(bool, LogSweeper, false, \ 1479 "Keep a ring buffer of sweeper activity") \ 1480 \ 1481 notproduct(intx, SweeperLogEntries, 1024, \ 1482 "Number of records in the ring buffer of sweeper activity") \ 1483 \ 1484 notproduct(intx, MemProfilingInterval, 500, \ 1485 "Time between each invocation of the MemProfiler") \ 1486 \ 1487 develop(intx, MallocCatchPtr, -1, \ 1488 "Hit breakpoint when mallocing/freeing this pointer") \ 1489 \ 1490 notproduct(ccstrlist, SuppressErrorAt, "", \ 1491 "List of assertions (file:line) to muzzle") \ 1492 \ 1493 develop(intx, StackPrintLimit, 100, \ 1494 "number of stack frames to print in VM-level stack dump") \ 1495 \ 1496 notproduct(intx, MaxElementPrintSize, 256, \ 1497 "maximum number of elements to print") \ 1498 \ 1499 notproduct(intx, MaxSubklassPrintSize, 4, \ 1500 "maximum number of subklasses to print when printing klass") \ 1501 \ 1502 product(intx, MaxInlineLevel, 15, \ 1503 "maximum number of nested calls that are inlined") \ 1504 range(0, max_jint) \ 1505 \ 1506 product(intx, MaxRecursiveInlineLevel, 1, \ 1507 "maximum number of nested recursive calls that are inlined") \ 1508 range(0, max_jint) \ 1509 \ 1510 develop(intx, MaxForceInlineLevel, 100, \ 1511 "maximum number of nested calls that are forced for inlining " \ 1512 "(using CompileCommand or marked w/ @ForceInline)") \ 1513 range(0, max_jint) \ 1514 \ 1515 product_pd(intx, InlineSmallCode, \ 1516 "Only inline already compiled methods if their code size is " \ 1517 "less than this") \ 1518 range(0, max_jint) \ 1519 \ 1520 product(intx, MaxInlineSize, 35, \ 1521 "The maximum bytecode size of a method to be inlined") \ 1522 range(0, max_jint) \ 1523 \ 1524 product_pd(intx, FreqInlineSize, \ 1525 "The maximum bytecode size of a frequent method to be inlined") \ 1526 range(0, max_jint) \ 1527 \ 1528 product(intx, MaxTrivialSize, 6, \ 1529 "The maximum bytecode size of a trivial method to be inlined") \ 1530 range(0, max_jint) \ 1531 \ 1532 product(intx, MinInliningThreshold, 250, \ 1533 "The minimum invocation count a method needs to have to be " \ 1534 "inlined") \ 1535 range(0, max_jint) \ 1536 \ 1537 develop(intx, MethodHistogramCutoff, 100, \ 1538 "The cutoff value for method invocation histogram (+CountCalls)") \ 1539 \ 1540 develop(intx, DontYieldALotInterval, 10, \ 1541 "Interval between which yields will be dropped (milliseconds)") \ 1542 \ 1543 notproduct(intx, DeoptimizeALotInterval, 5, \ 1544 "Number of exits until DeoptimizeALot kicks in") \ 1545 \ 1546 notproduct(intx, ZombieALotInterval, 5, \ 1547 "Number of exits until ZombieALot kicks in") \ 1548 \ 1549 diagnostic(uintx, MallocMaxTestWords, 0, \ 1550 "If non-zero, maximum number of words that malloc/realloc can " \ 1551 "allocate (for testing only)") \ 1552 range(0, max_uintx) \ 1553 \ 1554 product(intx, TypeProfileWidth, 2, \ 1555 "Number of receiver types to record in call/cast profile") \ 1556 range(0, 8) \ 1557 \ 1558 develop(intx, BciProfileWidth, 2, \ 1559 "Number of return bci's to record in ret profile") \ 1560 \ 1561 product(intx, PerMethodRecompilationCutoff, 400, \ 1562 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1563 range(-1, max_intx) \ 1564 \ 1565 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1566 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1567 range(-1, max_intx) \ 1568 \ 1569 product(intx, PerMethodTrapLimit, 100, \ 1570 "Limit on traps (of one kind) in a method (includes inlines)") \ 1571 range(0, max_jint) \ 1572 \ 1573 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1574 "Limit on speculative traps (of one kind) in a method " \ 1575 "(includes inlines)") \ 1576 range(0, max_jint) \ 1577 \ 1578 product(intx, PerBytecodeTrapLimit, 4, \ 1579 "Limit on traps (of one kind) at a particular BCI") \ 1580 range(0, max_jint) \ 1581 \ 1582 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1583 "Extra method data trap entries for speculation") \ 1584 \ 1585 develop(intx, InlineFrequencyRatio, 20, \ 1586 "Ratio of call site execution to caller method invocation") \ 1587 range(0, max_jint) \ 1588 \ 1589 diagnostic_pd(intx, InlineFrequencyCount, \ 1590 "Count of call site execution necessary to trigger frequent " \ 1591 "inlining") \ 1592 range(0, max_jint) \ 1593 \ 1594 develop(intx, InlineThrowCount, 50, \ 1595 "Force inlining of interpreted methods that throw this often") \ 1596 range(0, max_jint) \ 1597 \ 1598 develop(intx, InlineThrowMaxSize, 200, \ 1599 "Force inlining of throwing methods smaller than this") \ 1600 range(0, max_jint) \ 1601 \ 1602 develop(intx, ProfilerNodeSize, 1024, \ 1603 "Size in K to allocate for the Profile Nodes of each thread") \ 1604 range(0, 1024) \ 1605 \ 1606 product_pd(size_t, MetaspaceSize, \ 1607 "Initial threshold (in bytes) at which a garbage collection " \ 1608 "is done to reduce Metaspace usage") \ 1609 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1610 \ 1611 product(size_t, MaxMetaspaceSize, max_uintx, \ 1612 "Maximum size of Metaspaces (in bytes)") \ 1613 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1614 \ 1615 product(size_t, CompressedClassSpaceSize, 1*G, \ 1616 "Maximum size of class area in Metaspace when compressed " \ 1617 "class pointers are used") \ 1618 range(1*M, 3*G) \ 1619 \ 1620 manageable(uintx, MinHeapFreeRatio, 40, \ 1621 "The minimum percentage of heap free after GC to avoid expansion."\ 1622 " For most GCs this applies to the old generation. In G1 and" \ 1623 " ParallelGC it applies to the whole heap.") \ 1624 range(0, 100) \ 1625 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1626 \ 1627 manageable(uintx, MaxHeapFreeRatio, 70, \ 1628 "The maximum percentage of heap free after GC to avoid shrinking."\ 1629 " For most GCs this applies to the old generation. In G1 and" \ 1630 " ParallelGC it applies to the whole heap.") \ 1631 range(0, 100) \ 1632 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1633 \ 1634 product(bool, ShrinkHeapInSteps, true, \ 1635 "When disabled, informs the GC to shrink the java heap directly" \ 1636 " to the target size at the next full GC rather than requiring" \ 1637 " smaller steps during multiple full GCs.") \ 1638 \ 1639 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1640 "Number of milliseconds per MB of free space in the heap") \ 1641 range(0, max_intx) \ 1642 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1643 \ 1644 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1645 "The minimum change in heap space due to GC (in bytes)") \ 1646 range(0, max_uintx) \ 1647 \ 1648 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1649 "The minimum expansion of Metaspace (in bytes)") \ 1650 range(0, max_uintx) \ 1651 \ 1652 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1653 "The maximum percentage of Metaspace free after GC to avoid " \ 1654 "shrinking") \ 1655 range(0, 100) \ 1656 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1657 \ 1658 product(uintx, MinMetaspaceFreeRatio, 40, \ 1659 "The minimum percentage of Metaspace free after GC to avoid " \ 1660 "expansion") \ 1661 range(0, 99) \ 1662 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1663 \ 1664 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1665 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1666 range(0, max_uintx) \ 1667 \ 1668 /* stack parameters */ \ 1669 product_pd(intx, StackYellowPages, \ 1670 "Number of yellow zone (recoverable overflows) pages of size " \ 1671 "4KB. If pages are bigger yellow zone is aligned up.") \ 1672 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1673 \ 1674 product_pd(intx, StackRedPages, \ 1675 "Number of red zone (unrecoverable overflows) pages of size " \ 1676 "4KB. If pages are bigger red zone is aligned up.") \ 1677 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1678 \ 1679 product_pd(intx, StackReservedPages, \ 1680 "Number of reserved zone (reserved to annotated methods) pages" \ 1681 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1682 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1683 \ 1684 product(bool, RestrictReservedStack, true, \ 1685 "Restrict @ReservedStackAccess to trusted classes") \ 1686 \ 1687 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1688 product_pd(intx, StackShadowPages, \ 1689 "Number of shadow zone (for overflow checking) pages of size " \ 1690 "4KB. If pages are bigger shadow zone is aligned up. " \ 1691 "This should exceed the depth of the VM and native call stack.") \ 1692 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1693 \ 1694 product_pd(intx, ThreadStackSize, \ 1695 "Thread Stack Size (in Kbytes)") \ 1696 range(0, 1 * M) \ 1697 \ 1698 product_pd(intx, VMThreadStackSize, \ 1699 "Non-Java Thread Stack Size (in Kbytes)") \ 1700 range(0, max_intx/(1 * K)) \ 1701 \ 1702 product_pd(intx, CompilerThreadStackSize, \ 1703 "Compiler Thread Stack Size (in Kbytes)") \ 1704 range(0, max_intx/(1 * K)) \ 1705 \ 1706 develop_pd(size_t, JVMInvokeMethodSlack, \ 1707 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1708 \ 1709 /* code cache parameters */ \ 1710 develop_pd(uintx, CodeCacheSegmentSize, \ 1711 "Code cache segment size (in bytes) - smallest unit of " \ 1712 "allocation") \ 1713 range(1, 1024) \ 1714 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1715 \ 1716 develop_pd(intx, CodeEntryAlignment, \ 1717 "Code entry alignment for generated code (in bytes)") \ 1718 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1719 \ 1720 product_pd(intx, OptoLoopAlignment, \ 1721 "Align inner loops to zero relative to this modulus") \ 1722 range(1, 16) \ 1723 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1724 \ 1725 product_pd(uintx, InitialCodeCacheSize, \ 1726 "Initial code cache size (in bytes)") \ 1727 range(os::vm_page_size(), max_uintx) \ 1728 \ 1729 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1730 "Minimum code cache size (in bytes) required to start VM.") \ 1731 range(0, max_uintx) \ 1732 \ 1733 product(bool, SegmentedCodeCache, false, \ 1734 "Use a segmented code cache") \ 1735 \ 1736 product_pd(uintx, ReservedCodeCacheSize, \ 1737 "Reserved code cache size (in bytes) - maximum code cache size") \ 1738 range(os::vm_page_size(), max_uintx) \ 1739 \ 1740 product_pd(uintx, NonProfiledCodeHeapSize, \ 1741 "Size of code heap with non-profiled methods (in bytes)") \ 1742 range(0, max_uintx) \ 1743 \ 1744 product_pd(uintx, ProfiledCodeHeapSize, \ 1745 "Size of code heap with profiled methods (in bytes)") \ 1746 range(0, max_uintx) \ 1747 \ 1748 product_pd(uintx, NonNMethodCodeHeapSize, \ 1749 "Size of code heap with non-nmethods (in bytes)") \ 1750 range(os::vm_page_size(), max_uintx) \ 1751 \ 1752 product_pd(uintx, CodeCacheExpansionSize, \ 1753 "Code cache expansion size (in bytes)") \ 1754 range(32*K, max_uintx) \ 1755 \ 1756 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1757 "Minimum number of segments in a code cache block") \ 1758 range(1, 100) \ 1759 \ 1760 notproduct(bool, ExitOnFullCodeCache, false, \ 1761 "Exit the VM if we fill the code cache") \ 1762 \ 1763 product(bool, UseCodeCacheFlushing, true, \ 1764 "Remove cold/old nmethods from the code cache") \ 1765 \ 1766 product(uintx, StartAggressiveSweepingAt, 10, \ 1767 "Start aggressive sweeping if X[%] of the code cache is free." \ 1768 "Segmented code cache: X[%] of the non-profiled heap." \ 1769 "Non-segmented code cache: X[%] of the total code cache") \ 1770 range(0, 100) \ 1771 \ 1772 /* AOT parameters */ \ 1773 experimental(bool, UseAOT, false, \ 1774 "Use AOT compiled files") \ 1775 \ 1776 experimental(ccstrlist, AOTLibrary, NULL, \ 1777 "AOT library") \ 1778 \ 1779 experimental(bool, PrintAOT, false, \ 1780 "Print used AOT klasses and methods") \ 1781 \ 1782 notproduct(bool, PrintAOTStatistics, false, \ 1783 "Print AOT statistics") \ 1784 \ 1785 diagnostic(bool, UseAOTStrictLoading, false, \ 1786 "Exit the VM if any of the AOT libraries has invalid config") \ 1787 \ 1788 product(bool, CalculateClassFingerprint, false, \ 1789 "Calculate class fingerprint") \ 1790 \ 1791 /* interpreter debugging */ \ 1792 develop(intx, BinarySwitchThreshold, 5, \ 1793 "Minimal number of lookupswitch entries for rewriting to binary " \ 1794 "switch") \ 1795 \ 1796 develop(intx, StopInterpreterAt, 0, \ 1797 "Stop interpreter execution at specified bytecode number") \ 1798 \ 1799 develop(intx, TraceBytecodesAt, 0, \ 1800 "Trace bytecodes starting with specified bytecode number") \ 1801 \ 1802 /* compiler interface */ \ 1803 develop(intx, CIStart, 0, \ 1804 "The id of the first compilation to permit") \ 1805 \ 1806 develop(intx, CIStop, max_jint, \ 1807 "The id of the last compilation to permit") \ 1808 \ 1809 develop(intx, CIStartOSR, 0, \ 1810 "The id of the first osr compilation to permit " \ 1811 "(CICountOSR must be on)") \ 1812 \ 1813 develop(intx, CIStopOSR, max_jint, \ 1814 "The id of the last osr compilation to permit " \ 1815 "(CICountOSR must be on)") \ 1816 \ 1817 develop(intx, CIBreakAtOSR, -1, \ 1818 "The id of osr compilation to break at") \ 1819 \ 1820 develop(intx, CIBreakAt, -1, \ 1821 "The id of compilation to break at") \ 1822 \ 1823 product(ccstrlist, CompileOnly, "", \ 1824 "List of methods (pkg/class.name) to restrict compilation to") \ 1825 \ 1826 product(ccstr, CompileCommandFile, NULL, \ 1827 "Read compiler commands from this file [.hotspot_compiler]") \ 1828 \ 1829 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1830 "Read compiler directives from this file") \ 1831 \ 1832 product(ccstrlist, CompileCommand, "", \ 1833 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1834 \ 1835 develop(bool, ReplayCompiles, false, \ 1836 "Enable replay of compilations from ReplayDataFile") \ 1837 \ 1838 product(ccstr, ReplayDataFile, NULL, \ 1839 "File containing compilation replay information" \ 1840 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1841 \ 1842 product(ccstr, InlineDataFile, NULL, \ 1843 "File containing inlining replay information" \ 1844 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1845 \ 1846 develop(intx, ReplaySuppressInitializers, 2, \ 1847 "Control handling of class initialization during replay: " \ 1848 "0 - don't do anything special; " \ 1849 "1 - treat all class initializers as empty; " \ 1850 "2 - treat class initializers for application classes as empty; " \ 1851 "3 - allow all class initializers to run during bootstrap but " \ 1852 " pretend they are empty after starting replay") \ 1853 range(0, 3) \ 1854 \ 1855 develop(bool, ReplayIgnoreInitErrors, false, \ 1856 "Ignore exceptions thrown during initialization for replay") \ 1857 \ 1858 product(bool, DumpReplayDataOnError, true, \ 1859 "Record replay data for crashing compiler threads") \ 1860 \ 1861 product(bool, CICompilerCountPerCPU, false, \ 1862 "1 compiler thread for log(N CPUs)") \ 1863 \ 1864 notproduct(intx, CICrashAt, -1, \ 1865 "id of compilation to trigger assert in compiler thread for " \ 1866 "the purpose of testing, e.g. generation of replay data") \ 1867 notproduct(bool, CIObjectFactoryVerify, false, \ 1868 "enable potentially expensive verification in ciObjectFactory") \ 1869 \ 1870 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1871 "Abort VM when method had failed to compile.") \ 1872 \ 1873 /* Priorities */ \ 1874 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1875 \ 1876 product(intx, ThreadPriorityPolicy, 0, \ 1877 "0 : Normal. "\ 1878 " VM chooses priorities that are appropriate for normal "\ 1879 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1880 " to normal native priority. Java priorities below " \ 1881 " NORM_PRIORITY map to lower native priority values. On "\ 1882 " Windows applications are allowed to use higher native "\ 1883 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1884 " not use the highest possible native priority, "\ 1885 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1886 " system threads. On Linux thread priorities are ignored "\ 1887 " because the OS does not support static priority in "\ 1888 " SCHED_OTHER scheduling class which is the only choice for "\ 1889 " non-root, non-realtime applications. "\ 1890 "1 : Aggressive. "\ 1891 " Java thread priorities map over to the entire range of "\ 1892 " native thread priorities. Higher Java thread priorities map "\ 1893 " to higher native thread priorities. This policy should be "\ 1894 " used with care, as sometimes it can cause performance "\ 1895 " degradation in the application and/or the entire system. On "\ 1896 " Linux/BSD/macOS this policy requires root privilege or an "\ 1897 " extended capability.") \ 1898 range(0, 1) \ 1899 \ 1900 product(bool, ThreadPriorityVerbose, false, \ 1901 "Print priority changes") \ 1902 \ 1903 product(intx, CompilerThreadPriority, -1, \ 1904 "The native priority at which compiler threads should run " \ 1905 "(-1 means no change)") \ 1906 range(min_jint, max_jint) \ 1907 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1908 \ 1909 product(intx, VMThreadPriority, -1, \ 1910 "The native priority at which the VM thread should run " \ 1911 "(-1 means no change)") \ 1912 range(-1, 127) \ 1913 \ 1914 product(intx, JavaPriority1_To_OSPriority, -1, \ 1915 "Map Java priorities to OS priorities") \ 1916 range(-1, 127) \ 1917 \ 1918 product(intx, JavaPriority2_To_OSPriority, -1, \ 1919 "Map Java priorities to OS priorities") \ 1920 range(-1, 127) \ 1921 \ 1922 product(intx, JavaPriority3_To_OSPriority, -1, \ 1923 "Map Java priorities to OS priorities") \ 1924 range(-1, 127) \ 1925 \ 1926 product(intx, JavaPriority4_To_OSPriority, -1, \ 1927 "Map Java priorities to OS priorities") \ 1928 range(-1, 127) \ 1929 \ 1930 product(intx, JavaPriority5_To_OSPriority, -1, \ 1931 "Map Java priorities to OS priorities") \ 1932 range(-1, 127) \ 1933 \ 1934 product(intx, JavaPriority6_To_OSPriority, -1, \ 1935 "Map Java priorities to OS priorities") \ 1936 range(-1, 127) \ 1937 \ 1938 product(intx, JavaPriority7_To_OSPriority, -1, \ 1939 "Map Java priorities to OS priorities") \ 1940 range(-1, 127) \ 1941 \ 1942 product(intx, JavaPriority8_To_OSPriority, -1, \ 1943 "Map Java priorities to OS priorities") \ 1944 range(-1, 127) \ 1945 \ 1946 product(intx, JavaPriority9_To_OSPriority, -1, \ 1947 "Map Java priorities to OS priorities") \ 1948 range(-1, 127) \ 1949 \ 1950 product(intx, JavaPriority10_To_OSPriority,-1, \ 1951 "Map Java priorities to OS priorities") \ 1952 range(-1, 127) \ 1953 \ 1954 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1955 "Java thread priority 10 maps to critical scheduling priority") \ 1956 \ 1957 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1958 "Compiler thread(s) run at critical scheduling priority") \ 1959 \ 1960 develop(intx, NewCodeParameter, 0, \ 1961 "Testing Only: Create a dedicated integer parameter before " \ 1962 "putback") \ 1963 \ 1964 /* new oopmap storage allocation */ \ 1965 develop(intx, MinOopMapAllocation, 8, \ 1966 "Minimum number of OopMap entries in an OopMapSet") \ 1967 \ 1968 /* Background Compilation */ \ 1969 develop(intx, LongCompileThreshold, 50, \ 1970 "Used with +TraceLongCompiles") \ 1971 \ 1972 /* recompilation */ \ 1973 product_pd(intx, CompileThreshold, \ 1974 "number of interpreted method invocations before (re-)compiling") \ 1975 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1976 \ 1977 product(double, CompileThresholdScaling, 1.0, \ 1978 "Factor to control when first compilation happens " \ 1979 "(both with and without tiered compilation): " \ 1980 "values greater than 1.0 delay counter overflow, " \ 1981 "values between 0 and 1.0 rush counter overflow, " \ 1982 "value of 1.0 leaves compilation thresholds unchanged " \ 1983 "value of 0.0 is equivalent to -Xint. " \ 1984 "" \ 1985 "Flag can be set as per-method option. " \ 1986 "If a value is specified for a method, compilation thresholds " \ 1987 "for that method are scaled by both the value of the global flag "\ 1988 "and the value of the per-method flag.") \ 1989 range(0.0, DBL_MAX) \ 1990 \ 1991 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1992 "Interpreter (tier 0) invocation notification frequency") \ 1993 range(0, 30) \ 1994 \ 1995 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 1996 "C1 without MDO (tier 2) invocation notification frequency") \ 1997 range(0, 30) \ 1998 \ 1999 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 2000 "C1 with MDO profiling (tier 3) invocation notification " \ 2001 "frequency") \ 2002 range(0, 30) \ 2003 \ 2004 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 2005 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 2006 range(0, 30) \ 2007 \ 2008 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 2009 "Interpreter (tier 0) invocation notification frequency") \ 2010 range(0, 30) \ 2011 \ 2012 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 2013 "C1 without MDO (tier 2) invocation notification frequency") \ 2014 range(0, 30) \ 2015 \ 2016 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 2017 "C1 with MDO profiling (tier 3) invocation notification " \ 2018 "frequency") \ 2019 range(0, 30) \ 2020 \ 2021 product(intx, Tier2CompileThreshold, 0, \ 2022 "threshold at which tier 2 compilation is invoked") \ 2023 range(0, max_jint) \ 2024 \ 2025 product(intx, Tier2BackEdgeThreshold, 0, \ 2026 "Back edge threshold at which tier 2 compilation is invoked") \ 2027 range(0, max_jint) \ 2028 \ 2029 product(intx, Tier3InvocationThreshold, 200, \ 2030 "Compile if number of method invocations crosses this " \ 2031 "threshold") \ 2032 range(0, max_jint) \ 2033 \ 2034 product(intx, Tier3MinInvocationThreshold, 100, \ 2035 "Minimum invocation to compile at tier 3") \ 2036 range(0, max_jint) \ 2037 \ 2038 product(intx, Tier3CompileThreshold, 2000, \ 2039 "Threshold at which tier 3 compilation is invoked (invocation " \ 2040 "minimum must be satisfied)") \ 2041 range(0, max_jint) \ 2042 \ 2043 product(intx, Tier3BackEdgeThreshold, 60000, \ 2044 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2045 range(0, max_jint) \ 2046 \ 2047 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2048 "Compile if number of method invocations crosses this " \ 2049 "threshold if coming from AOT") \ 2050 range(0, max_jint) \ 2051 \ 2052 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2053 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2054 range(0, max_jint) \ 2055 \ 2056 product(intx, Tier3AOTCompileThreshold, 15000, \ 2057 "Threshold at which tier 3 compilation is invoked (invocation " \ 2058 "minimum must be satisfied) if coming from AOT") \ 2059 range(0, max_jint) \ 2060 \ 2061 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2062 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2063 "if coming from AOT") \ 2064 range(0, max_jint) \ 2065 \ 2066 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \ 2067 "Switch to interpreter to profile if the number of method " \ 2068 "invocations crosses this threshold if coming from AOT " \ 2069 "(applicable only with " \ 2070 "CompilationMode=high-only|high-only-quick-internal)") \ 2071 range(0, max_jint) \ 2072 \ 2073 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \ 2074 "Minimum number of invocations to switch to interpreter " \ 2075 "to profile if coming from AOT " \ 2076 "(applicable only with " \ 2077 "CompilationMode=high-only|high-only-quick-internal)") \ 2078 range(0, max_jint) \ 2079 \ 2080 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \ 2081 "Threshold at which to switch to interpreter to profile " \ 2082 "if coming from AOT " \ 2083 "(invocation minimum must be satisfied, " \ 2084 "applicable only with " \ 2085 "CompilationMode=high-only|high-only-quick-internal)") \ 2086 range(0, max_jint) \ 2087 \ 2088 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \ 2089 "Back edge threshold at which to switch to interpreter " \ 2090 "to profile if coming from AOT " \ 2091 "(applicable only with " \ 2092 "CompilationMode=high-only|high-only-quick-internal)") \ 2093 range(0, max_jint) \ 2094 \ 2095 product(intx, Tier4InvocationThreshold, 5000, \ 2096 "Compile if number of method invocations crosses this " \ 2097 "threshold") \ 2098 range(0, max_jint) \ 2099 \ 2100 product(intx, Tier4MinInvocationThreshold, 600, \ 2101 "Minimum invocation to compile at tier 4") \ 2102 range(0, max_jint) \ 2103 \ 2104 product(intx, Tier4CompileThreshold, 15000, \ 2105 "Threshold at which tier 4 compilation is invoked (invocation " \ 2106 "minimum must be satisfied)") \ 2107 range(0, max_jint) \ 2108 \ 2109 product(intx, Tier4BackEdgeThreshold, 40000, \ 2110 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2111 range(0, max_jint) \ 2112 \ 2113 diagnostic(intx, Tier40InvocationThreshold, 5000, \ 2114 "Compile if number of method invocations crosses this " \ 2115 "threshold (applicable only with " \ 2116 "CompilationMode=high-only|high-only-quick-internal)") \ 2117 range(0, max_jint) \ 2118 \ 2119 diagnostic(intx, Tier40MinInvocationThreshold, 600, \ 2120 "Minimum number of invocations to compile at tier 4 " \ 2121 "(applicable only with " \ 2122 "CompilationMode=high-only|high-only-quick-internal)") \ 2123 range(0, max_jint) \ 2124 \ 2125 diagnostic(intx, Tier40CompileThreshold, 10000, \ 2126 "Threshold at which tier 4 compilation is invoked (invocation " \ 2127 "minimum must be satisfied, applicable only with " \ 2128 "CompilationMode=high-only|high-only-quick-internal)") \ 2129 range(0, max_jint) \ 2130 \ 2131 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \ 2132 "Back edge threshold at which tier 4 OSR compilation is invoked " \ 2133 "(applicable only with " \ 2134 "CompilationMode=high-only|high-only-quick-internal)") \ 2135 range(0, max_jint) \ 2136 \ 2137 diagnostic(intx, Tier0Delay, 5, \ 2138 "If C2 queue size grows over this amount per compiler thread " \ 2139 "do not start profiling in the interpreter " \ 2140 "(applicable only with " \ 2141 "CompilationMode=high-only|high-only-quick-internal)") \ 2142 range(0, max_jint) \ 2143 \ 2144 product(intx, Tier3DelayOn, 5, \ 2145 "If C2 queue size grows over this amount per compiler thread " \ 2146 "stop compiling at tier 3 and start compiling at tier 2") \ 2147 range(0, max_jint) \ 2148 \ 2149 product(intx, Tier3DelayOff, 2, \ 2150 "If C2 queue size is less than this amount per compiler thread " \ 2151 "allow methods compiled at tier 2 transition to tier 3") \ 2152 range(0, max_jint) \ 2153 \ 2154 product(intx, Tier3LoadFeedback, 5, \ 2155 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2156 "reaches this amount per compiler thread") \ 2157 range(0, max_jint) \ 2158 \ 2159 product(intx, Tier4LoadFeedback, 3, \ 2160 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2161 "reaches this amount per compiler thread") \ 2162 range(0, max_jint) \ 2163 \ 2164 product(intx, TieredCompileTaskTimeout, 50, \ 2165 "Kill compile task if method was not used within " \ 2166 "given timeout in milliseconds") \ 2167 range(0, max_intx) \ 2168 \ 2169 product(intx, TieredStopAtLevel, 4, \ 2170 "Stop at given compilation level") \ 2171 range(0, 4) \ 2172 \ 2173 product(intx, Tier0ProfilingStartPercentage, 200, \ 2174 "Start profiling in interpreter if the counters exceed tier 3 " \ 2175 "thresholds (tier 4 thresholds with " \ 2176 "CompilationMode=high-only|high-only-quick-internal)" \ 2177 "by the specified percentage") \ 2178 range(0, max_jint) \ 2179 \ 2180 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2181 "Increase the compile threshold for C1 compilation if the code " \ 2182 "cache is filled by the specified percentage") \ 2183 range(0, 99) \ 2184 \ 2185 product(intx, TieredRateUpdateMinTime, 1, \ 2186 "Minimum rate sampling interval (in milliseconds)") \ 2187 range(0, max_intx) \ 2188 \ 2189 product(intx, TieredRateUpdateMaxTime, 25, \ 2190 "Maximum rate sampling interval (in milliseconds)") \ 2191 range(0, max_intx) \ 2192 \ 2193 product(ccstr, CompilationMode, "default", \ 2194 "Compilation modes: " \ 2195 "default: normal tiered compilation; " \ 2196 "quick-only: C1-only mode; " \ 2197 "high-only: C2/JVMCI-only mode; " \ 2198 "high-only-quick-internal: C2/JVMCI-only mode, " \ 2199 "with JVMCI compiler compiled with C1.") \ 2200 \ 2201 product_pd(bool, TieredCompilation, \ 2202 "Enable tiered compilation") \ 2203 \ 2204 product(bool, PrintTieredEvents, false, \ 2205 "Print tiered events notifications") \ 2206 \ 2207 product_pd(intx, OnStackReplacePercentage, \ 2208 "NON_TIERED number of method invocations/branches (expressed as " \ 2209 "% of CompileThreshold) before (re-)compiling OSR code") \ 2210 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2211 \ 2212 product(intx, InterpreterProfilePercentage, 33, \ 2213 "NON_TIERED number of method invocations/branches (expressed as " \ 2214 "% of CompileThreshold) before profiling in the interpreter") \ 2215 range(0, 100) \ 2216 \ 2217 develop(intx, DesiredMethodLimit, 8000, \ 2218 "The desired maximum method size (in bytecodes) after inlining") \ 2219 \ 2220 develop(intx, HugeMethodLimit, 8000, \ 2221 "Don't compile methods larger than this if " \ 2222 "+DontCompileHugeMethods") \ 2223 \ 2224 /* Properties for Java libraries */ \ 2225 \ 2226 product(uint64_t, MaxDirectMemorySize, 0, \ 2227 "Maximum total size of NIO direct-buffer allocations") \ 2228 range(0, max_jlong) \ 2229 \ 2230 /* Flags used for temporary code during development */ \ 2231 \ 2232 diagnostic(bool, UseNewCode, false, \ 2233 "Testing Only: Use the new version while testing") \ 2234 \ 2235 diagnostic(bool, UseNewCode2, false, \ 2236 "Testing Only: Use the new version while testing") \ 2237 \ 2238 diagnostic(bool, UseNewCode3, false, \ 2239 "Testing Only: Use the new version while testing") \ 2240 \ 2241 /* flags for performance data collection */ \ 2242 \ 2243 product(bool, UsePerfData, true, \ 2244 "Flag to disable jvmstat instrumentation for performance testing "\ 2245 "and problem isolation purposes") \ 2246 \ 2247 product(bool, PerfDataSaveToFile, false, \ 2248 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2249 \ 2250 product(ccstr, PerfDataSaveFile, NULL, \ 2251 "Save PerfData memory to the specified absolute pathname. " \ 2252 "The string %p in the file name (if present) " \ 2253 "will be replaced by pid") \ 2254 \ 2255 product(intx, PerfDataSamplingInterval, 50, \ 2256 "Data sampling interval (in milliseconds)") \ 2257 range(PeriodicTask::min_interval, max_jint) \ 2258 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2259 \ 2260 product(bool, PerfDisableSharedMem, false, \ 2261 "Store performance data in standard memory") \ 2262 \ 2263 product(intx, PerfDataMemorySize, 32*K, \ 2264 "Size of performance data memory region. Will be rounded " \ 2265 "up to a multiple of the native os page size.") \ 2266 range(128, 32*64*K) \ 2267 \ 2268 product(intx, PerfMaxStringConstLength, 1024, \ 2269 "Maximum PerfStringConstant string length before truncation") \ 2270 range(32, 32*K) \ 2271 \ 2272 product(bool, PerfAllowAtExitRegistration, false, \ 2273 "Allow registration of atexit() methods") \ 2274 \ 2275 product(bool, PerfBypassFileSystemCheck, false, \ 2276 "Bypass Win32 file system criteria checks (Windows Only)") \ 2277 \ 2278 product(intx, UnguardOnExecutionViolation, 0, \ 2279 "Unguard page and retry on no-execute fault (Win32 only) " \ 2280 "0=off, 1=conservative, 2=aggressive") \ 2281 range(0, 2) \ 2282 \ 2283 /* Serviceability Support */ \ 2284 \ 2285 product(bool, ManagementServer, false, \ 2286 "Create JMX Management Server") \ 2287 \ 2288 product(bool, DisableAttachMechanism, false, \ 2289 "Disable mechanism that allows tools to attach to this VM") \ 2290 \ 2291 product(bool, StartAttachListener, false, \ 2292 "Always start Attach Listener at VM startup") \ 2293 \ 2294 product(bool, EnableDynamicAgentLoading, true, \ 2295 "Allow tools to load agents with the attach mechanism") \ 2296 \ 2297 manageable(bool, PrintConcurrentLocks, false, \ 2298 "Print java.util.concurrent locks in thread dump") \ 2299 \ 2300 /* Shared spaces */ \ 2301 \ 2302 product(bool, UseSharedSpaces, true, \ 2303 "Use shared spaces for metadata") \ 2304 \ 2305 product(bool, VerifySharedSpaces, false, \ 2306 "Verify integrity of shared spaces") \ 2307 \ 2308 product(bool, RequireSharedSpaces, false, \ 2309 "Require shared spaces for metadata") \ 2310 \ 2311 product(bool, DumpSharedSpaces, false, \ 2312 "Special mode: JVM reads a class list, loads classes, builds " \ 2313 "shared spaces, and dumps the shared spaces to a file to be " \ 2314 "used in future JVM runs") \ 2315 \ 2316 product(bool, DynamicDumpSharedSpaces, false, \ 2317 "Dynamic archive") \ 2318 \ 2319 product(bool, PrintSharedArchiveAndExit, false, \ 2320 "Print shared archive file contents") \ 2321 \ 2322 product(bool, PrintSharedDictionary, false, \ 2323 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2324 "dictionary") \ 2325 \ 2326 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2327 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2328 "Address to allocate shared memory region for class data") \ 2329 range(0, SIZE_MAX) \ 2330 \ 2331 product(ccstr, SharedArchiveConfigFile, NULL, \ 2332 "Data to add to the CDS archive file") \ 2333 \ 2334 product(uintx, SharedSymbolTableBucketSize, 4, \ 2335 "Average number of symbols per bucket in shared table") \ 2336 range(2, 246) \ 2337 \ 2338 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2339 "Allow Java agent to be run with CDS dumping") \ 2340 \ 2341 diagnostic(bool, PrintMethodHandleStubs, false, \ 2342 "Print generated stub code for method handles") \ 2343 \ 2344 develop(bool, TraceMethodHandles, false, \ 2345 "trace internal method handle operations") \ 2346 \ 2347 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2348 "perform extra checks when constructing method handles") \ 2349 \ 2350 diagnostic(bool, ShowHiddenFrames, false, \ 2351 "show method handle implementation frames (usually hidden)") \ 2352 \ 2353 experimental(bool, TrustFinalNonStaticFields, false, \ 2354 "trust final non-static declarations for constant folding") \ 2355 \ 2356 diagnostic(bool, FoldStableValues, true, \ 2357 "Optimize loads from stable fields (marked w/ @Stable)") \ 2358 \ 2359 develop(bool, TraceInvokeDynamic, false, \ 2360 "trace internal invoke dynamic operations") \ 2361 \ 2362 diagnostic(int, UseBootstrapCallInfo, 1, \ 2363 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2364 "resolved before the bootstrap method is called; 1: when a BSM " \ 2365 "that may accept a BootstrapCallInfo is detected, use that API " \ 2366 "to pass BSM arguments, which allows the BSM to delay their " \ 2367 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2368 "via that API, instead of with the eagerly-resolved array.") \ 2369 \ 2370 diagnostic(bool, PauseAtStartup, false, \ 2371 "Causes the VM to pause at startup time and wait for the pause " \ 2372 "file to be removed (default: ./vm.paused.<pid>)") \ 2373 \ 2374 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2375 "The file to create and for whose removal to await when pausing " \ 2376 "at startup. (default: ./vm.paused.<pid>)") \ 2377 \ 2378 diagnostic(bool, PauseAtExit, false, \ 2379 "Pause and wait for keypress on exit if a debugger is attached") \ 2380 \ 2381 product(bool, ExtendedDTraceProbes, false, \ 2382 "Enable performance-impacting dtrace probes") \ 2383 \ 2384 product(bool, DTraceMethodProbes, false, \ 2385 "Enable dtrace probes for method-entry and method-exit") \ 2386 \ 2387 product(bool, DTraceAllocProbes, false, \ 2388 "Enable dtrace probes for object allocation") \ 2389 \ 2390 product(bool, DTraceMonitorProbes, false, \ 2391 "Enable dtrace probes for monitor events") \ 2392 \ 2393 product(bool, RelaxAccessControlCheck, false, \ 2394 "Relax the access control checks in the verifier") \ 2395 \ 2396 product(uintx, StringTableSize, defaultStringTableSize, \ 2397 "Number of buckets in the interned String table " \ 2398 "(will be rounded to nearest higher power of 2)") \ 2399 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 2400 \ 2401 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2402 "Number of buckets in the JVM internal Symbol table") \ 2403 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 2404 \ 2405 product(bool, UseStringDeduplication, false, \ 2406 "Use string deduplication") \ 2407 \ 2408 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2409 "A string must reach this age (or be promoted to an old region) " \ 2410 "to be considered for deduplication") \ 2411 range(1, markWord::max_age) \ 2412 \ 2413 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2414 "Force table resize every time the table is scanned") \ 2415 \ 2416 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2417 "Force table rehash every time the table is scanned") \ 2418 \ 2419 diagnostic(bool, WhiteBoxAPI, false, \ 2420 "Enable internal testing APIs") \ 2421 \ 2422 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2423 "Default survivor space alignment in bytes") \ 2424 range(8, 256) \ 2425 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2426 \ 2427 product(ccstr, DumpLoadedClassList, NULL, \ 2428 "Dump the names all loaded classes, that could be stored into " \ 2429 "the CDS archive, in the specified file") \ 2430 \ 2431 product(ccstr, SharedClassListFile, NULL, \ 2432 "Override the default CDS class list") \ 2433 \ 2434 product(ccstr, SharedArchiveFile, NULL, \ 2435 "Override the default location of the CDS archive file") \ 2436 \ 2437 product(ccstr, ArchiveClassesAtExit, NULL, \ 2438 "The path and name of the dynamic archive file") \ 2439 \ 2440 product(ccstr, ExtraSharedClassListFile, NULL, \ 2441 "Extra classlist for building the CDS archive file") \ 2442 \ 2443 diagnostic(intx, ArchiveRelocationMode, 0, \ 2444 "(0) first map at preferred address, and if " \ 2445 "unsuccessful, map at alternative address (default); " \ 2446 "(1) always map at alternative address; " \ 2447 "(2) always map at preferred address, and if unsuccessful, " \ 2448 "do not map the archive") \ 2449 range(0, 2) \ 2450 \ 2451 experimental(size_t, ArrayAllocatorMallocLimit, \ 2452 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2453 "Allocation less than this value will be allocated " \ 2454 "using malloc. Larger allocations will use mmap.") \ 2455 \ 2456 experimental(bool, AlwaysAtomicAccesses, false, \ 2457 "Accesses to all variables should always be atomic") \ 2458 \ 2459 diagnostic(bool, UseUnalignedAccesses, false, \ 2460 "Use unaligned memory accesses in Unsafe") \ 2461 \ 2462 product_pd(bool, PreserveFramePointer, \ 2463 "Use the FP register for holding the frame pointer " \ 2464 "and not as a general purpose register.") \ 2465 \ 2466 diagnostic(bool, CheckIntrinsics, true, \ 2467 "When a class C is loaded, check that " \ 2468 "(1) all intrinsics defined by the VM for class C are present "\ 2469 "in the loaded class file and are marked with the " \ 2470 "@HotSpotIntrinsicCandidate annotation, that " \ 2471 "(2) there is an intrinsic registered for all loaded methods " \ 2472 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2473 "annotation, and that " \ 2474 "(3) no orphan methods exist for class C (i.e., methods for " \ 2475 "which the VM declares an intrinsic but that are not declared "\ 2476 "in the loaded class C. " \ 2477 "Check (3) is available only in debug builds.") \ 2478 \ 2479 diagnostic_pd(intx, InitArrayShortSize, \ 2480 "Threshold small size (in bytes) for clearing arrays. " \ 2481 "Anything this size or smaller may get converted to discrete " \ 2482 "scalar stores.") \ 2483 range(0, max_intx) \ 2484 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2485 \ 2486 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2487 "Disable backwards compatibility for compile commands.") \ 2488 \ 2489 diagnostic(bool, CompilerDirectivesPrint, false, \ 2490 "Print compiler directives on installation.") \ 2491 diagnostic(int, CompilerDirectivesLimit, 50, \ 2492 "Limit on number of compiler directives.") \ 2493 \ 2494 product(ccstr, AllocateHeapAt, NULL, \ 2495 "Path to the directoy where a temporary file will be created " \ 2496 "to use as the backing store for Java Heap.") \ 2497 \ 2498 experimental(ccstr, AllocateOldGenAt, NULL, \ 2499 "Path to the directoy where a temporary file will be " \ 2500 "created to use as the backing store for old generation." \ 2501 "File of size Xmx is pre-allocated for performance reason, so" \ 2502 "we need that much space available") \ 2503 \ 2504 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2505 "Run periodic metaspace verifications (0 - none, " \ 2506 "1 - always, >1 every nth interval)") \ 2507 \ 2508 diagnostic(bool, ShowRegistersOnAssert, true, \ 2509 "On internal errors, include registers in error report.") \ 2510 \ 2511 diagnostic(bool, UseSwitchProfiling, true, \ 2512 "leverage profiling for table/lookup switch") \ 2513 \ 2514 develop(bool, TraceMemoryWriteback, false, \ 2515 "Trace memory writeback operations") \ 2516 \ 2517 JFR_ONLY(product(bool, FlightRecorder, false, \ 2518 "(Deprecated) Enable Flight Recorder")) \ 2519 \ 2520 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2521 "Flight Recorder options")) \ 2522 \ 2523 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2524 "Start flight recording with options")) \ 2525 \ 2526 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2527 "Use platform unstable time where supported for timestamps only") 2528 2529 // Interface macros 2530 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2531 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2532 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2533 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2534 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2535 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2536 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2537 #ifdef PRODUCT 2538 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2539 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2540 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2541 #else 2542 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2543 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2544 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2545 #endif // PRODUCT 2546 // Special LP64 flags, product only needed for now. 2547 #ifdef _LP64 2548 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2549 #else 2550 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2551 #endif // _LP64 2552 2553 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2554 DECLARE_PD_DEVELOPER_FLAG, \ 2555 DECLARE_PRODUCT_FLAG, \ 2556 DECLARE_PD_PRODUCT_FLAG, \ 2557 DECLARE_DIAGNOSTIC_FLAG, \ 2558 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2559 DECLARE_EXPERIMENTAL_FLAG, \ 2560 DECLARE_NOTPRODUCT_FLAG, \ 2561 DECLARE_MANAGEABLE_FLAG, \ 2562 DECLARE_PRODUCT_RW_FLAG, \ 2563 DECLARE_LP64_PRODUCT_FLAG, \ 2564 IGNORE_RANGE, \ 2565 IGNORE_CONSTRAINT, \ 2566 IGNORE_WRITEABLE) 2567 2568 #endif // SHARE_RUNTIME_GLOBALS_HPP