1 /* 2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_RUNTIME_GLOBALS_HPP 26 #define SHARE_RUNTIME_GLOBALS_HPP 27 28 #include "compiler/compiler_globals.hpp" 29 #include "gc/shared/gc_globals.hpp" 30 #include "runtime/globals_shared.hpp" 31 #include "utilities/align.hpp" 32 #include "utilities/globalDefinitions.hpp" 33 #include "utilities/macros.hpp" 34 #include CPU_HEADER(globals) 35 #include OS_HEADER(globals) 36 #include OS_CPU_HEADER(globals) 37 38 // develop flags are settable / visible only during development and are constant in the PRODUCT version 39 // product flags are always settable / visible 40 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 41 42 // A flag must be declared with one of the following types: 43 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t. 44 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used 45 // only in this file, because the macrology requires single-token type names. 46 47 // Note: Diagnostic options not meant for VM tuning or for product modes. 48 // They are to be used for VM quality assurance or field diagnosis 49 // of VM bugs. They are hidden so that users will not be encouraged to 50 // try them as if they were VM ordinary execution options. However, they 51 // are available in the product version of the VM. Under instruction 52 // from support engineers, VM customers can turn them on to collect 53 // diagnostic information about VM problems. To use a VM diagnostic 54 // option, you must first specify +UnlockDiagnosticVMOptions. 55 // (This master switch also affects the behavior of -Xprintflags.) 56 // 57 // experimental flags are in support of features that are not 58 // part of the officially supported product, but are available 59 // for experimenting with. They could, for example, be performance 60 // features that may not have undergone full or rigorous QA, but which may 61 // help performance in some cases and released for experimentation 62 // by the community of users and developers. This flag also allows one to 63 // be able to build a fully supported product that nonetheless also 64 // ships with some unsupported, lightly tested, experimental features. 65 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 66 // UnlockExperimentalVMOptions flag, which allows the control and 67 // modification of the experimental flags. 68 // 69 // Nota bene: neither diagnostic nor experimental options should be used casually, 70 // and they are not supported on production loads, except under explicit 71 // direction from support engineers. 72 // 73 // manageable flags are writeable external product flags. 74 // They are dynamically writeable through the JDK management interface 75 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 76 // These flags are external exported interface (see CCC). The list of 77 // manageable flags can be queried programmatically through the management 78 // interface. 79 // 80 // A flag can be made as "manageable" only if 81 // - the flag is defined in a CCC as an external exported interface. 82 // - the VM implementation supports dynamic setting of the flag. 83 // This implies that the VM must *always* query the flag variable 84 // and not reuse state related to the flag state at any given time. 85 // - you want the flag to be queried programmatically by the customers. 86 // 87 // product_rw flags are writeable internal product flags. 88 // They are like "manageable" flags but for internal/private use. 89 // The list of product_rw flags are internal/private flags which 90 // may be changed/removed in a future release. It can be set 91 // through the management interface to get/set value 92 // when the name of flag is supplied. 93 // 94 // A flag can be made as "product_rw" only if 95 // - the VM implementation supports dynamic setting of the flag. 96 // This implies that the VM must *always* query the flag variable 97 // and not reuse state related to the flag state at any given time. 98 // 99 // Note that when there is a need to support develop flags to be writeable, 100 // it can be done in the same way as product_rw. 101 // 102 // range is a macro that will expand to min and max arguments for range 103 // checking code if provided - see jvmFlagRangeList.hpp 104 // 105 // constraint is a macro that will expand to custom function call 106 // for constraint checking if provided - see jvmFlagConstraintList.hpp 107 108 // Default and minimum StringTable and SymbolTable size values 109 // Must be powers of 2 110 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 111 const size_t minimumStringTableSize = 128; 112 const size_t defaultSymbolTableSize = 32768; // 2^15 113 const size_t minimumSymbolTableSize = 1024; 114 115 #define RUNTIME_FLAGS(develop, \ 116 develop_pd, \ 117 product, \ 118 product_pd, \ 119 diagnostic, \ 120 diagnostic_pd, \ 121 experimental, \ 122 notproduct, \ 123 manageable, \ 124 product_rw, \ 125 lp64_product, \ 126 range, \ 127 constraint) \ 128 \ 129 lp64_product(bool, UseCompressedOops, false, \ 130 "Use 32-bit object references in 64-bit VM. " \ 131 "lp64_product means flag is always constant in 32 bit VM") \ 132 \ 133 lp64_product(bool, UseCompressedClassPointers, false, \ 134 "Use 32-bit class pointers in 64-bit VM. " \ 135 "lp64_product means flag is always constant in 32 bit VM") \ 136 \ 137 notproduct(bool, CheckCompressedOops, true, \ 138 "Generate checks in encoding/decoding code in debug VM") \ 139 \ 140 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 141 "Heap allocation steps through preferred address regions to find" \ 142 " where it can allocate the heap. Number of steps to take per " \ 143 "region.") \ 144 range(1, max_uintx) \ 145 \ 146 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 147 "Default object alignment in bytes, 8 is minimum") \ 148 range(8, 256) \ 149 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 150 \ 151 develop(bool, CleanChunkPoolAsync, true, \ 152 "Clean the chunk pool asynchronously") \ 153 \ 154 diagnostic(uint, HandshakeTimeout, 0, \ 155 "If nonzero set a timeout in milliseconds for handshakes") \ 156 \ 157 experimental(bool, AlwaysSafeConstructors, false, \ 158 "Force safe construction, as if all fields are final.") \ 159 \ 160 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 161 "Enable normal processing of flags relating to field diagnostics")\ 162 \ 163 experimental(bool, UnlockExperimentalVMOptions, false, \ 164 "Enable normal processing of flags relating to experimental " \ 165 "features") \ 166 \ 167 product(bool, JavaMonitorsInStackTrace, true, \ 168 "Print information about Java monitor locks when the stacks are" \ 169 "dumped") \ 170 \ 171 product_pd(bool, UseLargePages, \ 172 "Use large page memory") \ 173 \ 174 product_pd(bool, UseLargePagesIndividualAllocation, \ 175 "Allocate large pages individually for better affinity") \ 176 \ 177 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 178 "Fail large pages individual allocation") \ 179 \ 180 product(bool, UseLargePagesInMetaspace, false, \ 181 "Use large page memory in metaspace. " \ 182 "Only used if UseLargePages is enabled.") \ 183 \ 184 product(bool, UseNUMA, false, \ 185 "Use NUMA if available") \ 186 \ 187 product(bool, UseNUMAInterleaving, false, \ 188 "Interleave memory across NUMA nodes if available") \ 189 \ 190 product(size_t, NUMAInterleaveGranularity, 2*M, \ 191 "Granularity to use for NUMA interleaving on Windows OS") \ 192 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 193 \ 194 product(bool, ForceNUMA, false, \ 195 "Force NUMA optimizations on single-node/UMA systems") \ 196 \ 197 product(uintx, NUMAChunkResizeWeight, 20, \ 198 "Percentage (0-100) used to weight the current sample when " \ 199 "computing exponentially decaying average for " \ 200 "AdaptiveNUMAChunkSizing") \ 201 range(0, 100) \ 202 \ 203 product(size_t, NUMASpaceResizeRate, 1*G, \ 204 "Do not reallocate more than this amount per collection") \ 205 range(0, max_uintx) \ 206 \ 207 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 208 "Enable adaptive chunk sizing for NUMA") \ 209 \ 210 product(bool, NUMAStats, false, \ 211 "Print NUMA stats in detailed heap information") \ 212 \ 213 product(uintx, NUMAPageScanRate, 256, \ 214 "Maximum number of pages to include in the page scan procedure") \ 215 range(0, max_uintx) \ 216 \ 217 product(intx, UseSSE, 99, \ 218 "Highest supported SSE instructions set on x86/x64") \ 219 range(0, 99) \ 220 \ 221 product(bool, UseAES, false, \ 222 "Control whether AES instructions are used when available") \ 223 \ 224 product(bool, UseFMA, false, \ 225 "Control whether FMA instructions are used when available") \ 226 \ 227 product(bool, UseSHA, false, \ 228 "Control whether SHA instructions are used when available") \ 229 \ 230 diagnostic(bool, UseGHASHIntrinsics, false, \ 231 "Use intrinsics for GHASH versions of crypto") \ 232 \ 233 product(bool, UseBASE64Intrinsics, false, \ 234 "Use intrinsics for java.util.Base64") \ 235 \ 236 product(size_t, LargePageSizeInBytes, 0, \ 237 "Large page size (0 to let VM choose the page size)") \ 238 range(0, max_uintx) \ 239 \ 240 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 241 "Use large pages if maximum heap is at least this big") \ 242 range(0, max_uintx) \ 243 \ 244 product(bool, ForceTimeHighResolution, false, \ 245 "Using high time resolution (for Win32 only)") \ 246 \ 247 develop(bool, TracePcPatching, false, \ 248 "Trace usage of frame::patch_pc") \ 249 \ 250 develop(bool, TraceRelocator, false, \ 251 "Trace the bytecode relocator") \ 252 \ 253 develop(bool, TraceLongCompiles, false, \ 254 "Print out every time compilation is longer than " \ 255 "a given threshold") \ 256 \ 257 diagnostic(bool, SafepointALot, false, \ 258 "Generate a lot of safepoints. This works with " \ 259 "GuaranteedSafepointInterval") \ 260 \ 261 diagnostic(bool, HandshakeALot, false, \ 262 "Generate a lot of handshakes. This works with " \ 263 "GuaranteedSafepointInterval") \ 264 \ 265 product_pd(bool, BackgroundCompilation, \ 266 "A thread requesting compilation is not blocked during " \ 267 "compilation") \ 268 \ 269 product(bool, PrintVMQWaitTime, false, \ 270 "(Deprecated) Print out the waiting time in VM operation queue") \ 271 \ 272 product(bool, MethodFlushing, true, \ 273 "Reclamation of zombie and not-entrant methods") \ 274 \ 275 develop(bool, VerifyStack, false, \ 276 "Verify stack of each thread when it is entering a runtime call") \ 277 \ 278 diagnostic(bool, ForceUnreachable, false, \ 279 "Make all non code cache addresses to be unreachable by " \ 280 "forcing use of 64bit literal fixups") \ 281 \ 282 notproduct(bool, StressDerivedPointers, false, \ 283 "Force scavenge when a derived pointer is detected on stack " \ 284 "after rtm call") \ 285 \ 286 develop(bool, TraceDerivedPointers, false, \ 287 "Trace traversal of derived pointers on stack") \ 288 \ 289 notproduct(bool, TraceCodeBlobStacks, false, \ 290 "Trace stack-walk of codeblobs") \ 291 \ 292 notproduct(bool, PrintRewrites, false, \ 293 "Print methods that are being rewritten") \ 294 \ 295 product(bool, UseInlineCaches, true, \ 296 "Use Inline Caches for virtual calls ") \ 297 \ 298 diagnostic(bool, InlineArrayCopy, true, \ 299 "Inline arraycopy native that is known to be part of " \ 300 "base library DLL") \ 301 \ 302 diagnostic(bool, InlineObjectHash, true, \ 303 "Inline Object::hashCode() native that is known to be part " \ 304 "of base library DLL") \ 305 \ 306 diagnostic(bool, InlineNatives, true, \ 307 "Inline natives that are known to be part of base library DLL") \ 308 \ 309 diagnostic(bool, InlineMathNatives, true, \ 310 "Inline SinD, CosD, etc.") \ 311 \ 312 diagnostic(bool, InlineClassNatives, true, \ 313 "Inline Class.isInstance, etc") \ 314 \ 315 diagnostic(bool, InlineThreadNatives, true, \ 316 "Inline Thread.currentThread, etc") \ 317 \ 318 diagnostic(bool, InlineUnsafeOps, true, \ 319 "Inline memory ops (native methods) from Unsafe") \ 320 \ 321 product(bool, CriticalJNINatives, true, \ 322 "Check for critical JNI entry points") \ 323 \ 324 notproduct(bool, StressCriticalJNINatives, false, \ 325 "Exercise register saving code in critical natives") \ 326 \ 327 diagnostic(bool, UseAESIntrinsics, false, \ 328 "Use intrinsics for AES versions of crypto") \ 329 \ 330 diagnostic(bool, UseAESCTRIntrinsics, false, \ 331 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 332 \ 333 diagnostic(bool, UseSHA1Intrinsics, false, \ 334 "Use intrinsics for SHA-1 crypto hash function. " \ 335 "Requires that UseSHA is enabled.") \ 336 \ 337 diagnostic(bool, UseSHA256Intrinsics, false, \ 338 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 339 "Requires that UseSHA is enabled.") \ 340 \ 341 diagnostic(bool, UseSHA512Intrinsics, false, \ 342 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 343 "Requires that UseSHA is enabled.") \ 344 \ 345 diagnostic(bool, UseCRC32Intrinsics, false, \ 346 "use intrinsics for java.util.zip.CRC32") \ 347 \ 348 diagnostic(bool, UseCRC32CIntrinsics, false, \ 349 "use intrinsics for java.util.zip.CRC32C") \ 350 \ 351 diagnostic(bool, UseAdler32Intrinsics, false, \ 352 "use intrinsics for java.util.zip.Adler32") \ 353 \ 354 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 355 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 356 \ 357 diagnostic(ccstrlist, DisableIntrinsic, "", \ 358 "do not expand intrinsics whose (internal) names appear here") \ 359 \ 360 develop(bool, TraceCallFixup, false, \ 361 "Trace all call fixups") \ 362 \ 363 develop(bool, DeoptimizeALot, false, \ 364 "Deoptimize at every exit from the runtime system") \ 365 \ 366 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 367 "A comma separated list of bcis to deoptimize at") \ 368 \ 369 develop(bool, DeoptimizeRandom, false, \ 370 "Deoptimize random frames on random exit from the runtime system")\ 371 \ 372 notproduct(bool, ZombieALot, false, \ 373 "Create zombies (non-entrant) at exit from the runtime system") \ 374 \ 375 notproduct(bool, WalkStackALot, false, \ 376 "Trace stack (no print) at every exit from the runtime system") \ 377 \ 378 product(bool, Debugging, false, \ 379 "Set when executing debug methods in debug.cpp " \ 380 "(to prevent triggering assertions)") \ 381 \ 382 notproduct(bool, VerifyLastFrame, false, \ 383 "Verify oops on last frame on entry to VM") \ 384 \ 385 product(bool, SafepointTimeout, false, \ 386 "Time out and warn or fail after SafepointTimeoutDelay " \ 387 "milliseconds if failed to reach safepoint") \ 388 \ 389 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 390 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 391 \ 392 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 393 "Abort upon failure to complete VM operation promptly") \ 394 \ 395 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 396 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 397 range(0, max_intx) \ 398 \ 399 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 400 /* typically, at most a few retries are needed */ \ 401 product(intx, SuspendRetryCount, 50, \ 402 "Maximum retry count for an external suspend request") \ 403 range(0, max_intx) \ 404 \ 405 product(intx, SuspendRetryDelay, 5, \ 406 "Milliseconds to delay per retry (* current_retry_count)") \ 407 range(0, max_intx) \ 408 \ 409 product(bool, AssertOnSuspendWaitFailure, false, \ 410 "Assert/Guarantee on external suspend wait failure") \ 411 \ 412 product(bool, TraceSuspendWaitFailures, false, \ 413 "Trace external suspend wait failures") \ 414 \ 415 product(bool, MaxFDLimit, true, \ 416 "Bump the number of file descriptors to maximum in Solaris") \ 417 \ 418 diagnostic(bool, LogEvents, true, \ 419 "Enable the various ring buffer event logs") \ 420 \ 421 diagnostic(uintx, LogEventsBufferEntries, 20, \ 422 "Number of ring buffer event logs") \ 423 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 424 \ 425 diagnostic(bool, BytecodeVerificationRemote, true, \ 426 "Enable the Java bytecode verifier for remote classes") \ 427 \ 428 diagnostic(bool, BytecodeVerificationLocal, false, \ 429 "Enable the Java bytecode verifier for local classes") \ 430 \ 431 develop(bool, ForceFloatExceptions, trueInDebug, \ 432 "Force exceptions on FP stack under/overflow") \ 433 \ 434 develop(bool, VerifyStackAtCalls, false, \ 435 "Verify that the stack pointer is unchanged after calls") \ 436 \ 437 develop(bool, TraceJavaAssertions, false, \ 438 "Trace java language assertions") \ 439 \ 440 notproduct(bool, VerifyCodeCache, false, \ 441 "Verify code cache on memory allocation/deallocation") \ 442 \ 443 develop(bool, UseMallocOnly, false, \ 444 "Use only malloc/free for allocation (no resource area/arena)") \ 445 \ 446 develop(bool, ZapResourceArea, trueInDebug, \ 447 "Zap freed resource/arena space with 0xABABABAB") \ 448 \ 449 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 450 "Zap freed VM handle space with 0xBCBCBCBC") \ 451 \ 452 notproduct(bool, ZapStackSegments, trueInDebug, \ 453 "Zap allocated/freed stack segments with 0xFADFADED") \ 454 \ 455 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 456 "Zap unused heap space with 0xBAADBABE") \ 457 \ 458 develop(bool, CheckZapUnusedHeapArea, false, \ 459 "Check zapping of unused heap space") \ 460 \ 461 develop(bool, ZapFillerObjects, trueInDebug, \ 462 "Zap filler objects with 0xDEAFBABE") \ 463 \ 464 develop(bool, PrintVMMessages, true, \ 465 "Print VM messages on console") \ 466 \ 467 notproduct(uintx, ErrorHandlerTest, 0, \ 468 "If > 0, provokes an error after VM initialization; the value " \ 469 "determines which error to provoke. See test_error_handler() " \ 470 "in vmError.cpp.") \ 471 \ 472 notproduct(uintx, TestCrashInErrorHandler, 0, \ 473 "If > 0, provokes an error inside VM error handler (a secondary " \ 474 "crash). see test_error_handler() in vmError.cpp") \ 475 \ 476 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 477 "If true, tests SafeFetch inside error handler.") \ 478 \ 479 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 480 "If true, simulates an unresponsive error handler.") \ 481 \ 482 develop(bool, Verbose, false, \ 483 "Print additional debugging information from other modes") \ 484 \ 485 develop(bool, PrintMiscellaneous, false, \ 486 "Print uncategorized debugging information (requires +Verbose)") \ 487 \ 488 develop(bool, WizardMode, false, \ 489 "Print much more debugging information") \ 490 \ 491 product(bool, ShowMessageBoxOnError, false, \ 492 "Keep process alive on VM fatal error") \ 493 \ 494 product(bool, CreateCoredumpOnCrash, true, \ 495 "Create core/mini dump on VM fatal error") \ 496 \ 497 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 498 "Timeout, in seconds, to limit the time spent on writing an " \ 499 "error log in case of a crash.") \ 500 range(0, (uint64_t)max_jlong/1000) \ 501 \ 502 product_pd(bool, UseOSErrorReporting, \ 503 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 504 \ 505 product(bool, SuppressFatalErrorMessage, false, \ 506 "Report NO fatal error message (avoid deadlock)") \ 507 \ 508 product(ccstrlist, OnError, "", \ 509 "Run user-defined commands on fatal error; see VMError.cpp " \ 510 "for examples") \ 511 \ 512 product(ccstrlist, OnOutOfMemoryError, "", \ 513 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 514 \ 515 manageable(bool, HeapDumpBeforeFullGC, false, \ 516 "Dump heap to file before any major stop-the-world GC") \ 517 \ 518 manageable(bool, HeapDumpAfterFullGC, false, \ 519 "Dump heap to file after any major stop-the-world GC") \ 520 \ 521 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 522 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 523 \ 524 manageable(ccstr, HeapDumpPath, NULL, \ 525 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 526 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 527 "in the working directory)") \ 528 \ 529 develop(bool, BreakAtWarning, false, \ 530 "Execute breakpoint upon encountering VM warning") \ 531 \ 532 product(ccstr, NativeMemoryTracking, "off", \ 533 "Native memory tracking options") \ 534 \ 535 diagnostic(bool, PrintNMTStatistics, false, \ 536 "Print native memory tracking summary data if it is on") \ 537 \ 538 diagnostic(bool, LogCompilation, false, \ 539 "Log compilation activity in detail to LogFile") \ 540 \ 541 product(bool, PrintCompilation, false, \ 542 "Print compilations") \ 543 \ 544 product(bool, PrintExtendedThreadInfo, false, \ 545 "Print more information in thread dump") \ 546 \ 547 diagnostic(intx, ScavengeRootsInCode, 2, \ 548 "0: do not allow scavengable oops in the code cache; " \ 549 "1: allow scavenging from the code cache; " \ 550 "2: emit as many constants as the compiler can see") \ 551 range(0, 2) \ 552 \ 553 product(bool, AlwaysRestoreFPU, false, \ 554 "Restore the FPU control word after every JNI call (expensive)") \ 555 \ 556 diagnostic(bool, PrintCompilation2, false, \ 557 "Print additional statistics per compilation") \ 558 \ 559 diagnostic(bool, PrintAdapterHandlers, false, \ 560 "Print code generated for i2c/c2i adapters") \ 561 \ 562 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 563 "Verify that i2c/c2i adapters are called properly") \ 564 \ 565 develop(bool, VerifyAdapterSharing, false, \ 566 "Verify that the code for shared adapters is the equivalent") \ 567 \ 568 diagnostic(bool, PrintAssembly, false, \ 569 "Print assembly code (using external disassembler.so)") \ 570 \ 571 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 572 "Print options string passed to disassembler.so") \ 573 \ 574 notproduct(bool, PrintNMethodStatistics, false, \ 575 "Print a summary statistic for the generated nmethods") \ 576 \ 577 diagnostic(bool, PrintNMethods, false, \ 578 "Print assembly code for nmethods when generated") \ 579 \ 580 diagnostic(bool, PrintNativeNMethods, false, \ 581 "Print assembly code for native nmethods when generated") \ 582 \ 583 develop(bool, PrintDebugInfo, false, \ 584 "Print debug information for all nmethods when generated") \ 585 \ 586 develop(bool, PrintRelocations, false, \ 587 "Print relocation information for all nmethods when generated") \ 588 \ 589 develop(bool, PrintDependencies, false, \ 590 "Print dependency information for all nmethods when generated") \ 591 \ 592 develop(bool, PrintExceptionHandlers, false, \ 593 "Print exception handler tables for all nmethods when generated") \ 594 \ 595 develop(bool, StressCompiledExceptionHandlers, false, \ 596 "Exercise compiled exception handlers") \ 597 \ 598 develop(bool, InterceptOSException, false, \ 599 "Start debugger when an implicit OS (e.g. NULL) " \ 600 "exception happens") \ 601 \ 602 product(bool, PrintCodeCache, false, \ 603 "Print the code cache memory usage when exiting") \ 604 \ 605 develop(bool, PrintCodeCache2, false, \ 606 "Print detailed usage information on the code cache when exiting")\ 607 \ 608 product(bool, PrintCodeCacheOnCompilation, false, \ 609 "Print the code cache memory usage each time a method is " \ 610 "compiled") \ 611 \ 612 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 613 "Print code heap usage statistics on exit and on full condition") \ 614 \ 615 diagnostic(bool, PrintStubCode, false, \ 616 "Print generated stub code") \ 617 \ 618 product(bool, StackTraceInThrowable, true, \ 619 "Collect backtrace in throwable when exception happens") \ 620 \ 621 product(bool, OmitStackTraceInFastThrow, true, \ 622 "Omit backtraces for some 'hot' exceptions in optimized code") \ 623 \ 624 manageable(bool, ShowCodeDetailsInExceptionMessages, false, \ 625 "Show exception messages from RuntimeExceptions that contain " \ 626 "snippets of the failing code. Disable this to improve privacy.") \ 627 \ 628 product(bool, PrintWarnings, true, \ 629 "Print JVM warnings to output stream") \ 630 \ 631 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 632 "Print warnings for stalled SpinLocks") \ 633 \ 634 product(bool, RegisterFinalizersAtInit, true, \ 635 "Register finalizable objects at end of Object.<init> or " \ 636 "after allocation") \ 637 \ 638 develop(bool, RegisterReferences, true, \ 639 "Tell whether the VM should register soft/weak/final/phantom " \ 640 "references") \ 641 \ 642 develop(bool, IgnoreRewrites, false, \ 643 "Suppress rewrites of bytecodes in the oopmap generator. " \ 644 "This is unsafe!") \ 645 \ 646 develop(bool, PrintCodeCacheExtension, false, \ 647 "Print extension of code cache") \ 648 \ 649 develop(bool, UsePrivilegedStack, true, \ 650 "Enable the security JVM functions") \ 651 \ 652 develop(bool, ProtectionDomainVerification, true, \ 653 "Verify protection domain before resolution in system dictionary")\ 654 \ 655 product(bool, ClassUnloading, true, \ 656 "Do unloading of classes") \ 657 \ 658 product(bool, ClassUnloadingWithConcurrentMark, true, \ 659 "Do unloading of classes with a concurrent marking cycle") \ 660 \ 661 develop(bool, DisableStartThread, false, \ 662 "Disable starting of additional Java threads " \ 663 "(for debugging only)") \ 664 \ 665 develop(bool, MemProfiling, false, \ 666 "Write memory usage profiling to log file") \ 667 \ 668 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 669 "Print the system dictionary at exit") \ 670 \ 671 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 672 "Dynamically resize system dictionaries as needed") \ 673 \ 674 product(bool, AlwaysLockClassLoader, false, \ 675 "Require the VM to acquire the class loader lock before calling " \ 676 "loadClass() even for class loaders registering " \ 677 "as parallel capable") \ 678 \ 679 product(bool, AllowParallelDefineClass, false, \ 680 "Allow parallel defineClass requests for class loaders " \ 681 "registering as parallel capable") \ 682 \ 683 product_pd(bool, DontYieldALot, \ 684 "Throw away obvious excess yield calls") \ 685 \ 686 develop(bool, UseDetachedThreads, true, \ 687 "Use detached threads that are recycled upon termination " \ 688 "(for Solaris only)") \ 689 \ 690 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 691 "Disable the use of stack guard pages if the JVM is loaded " \ 692 "on the primordial process thread") \ 693 \ 694 product(bool, UseLWPSynchronization, true, \ 695 "Use LWP-based instead of libthread-based synchronization " \ 696 "(SPARC only)") \ 697 \ 698 product(intx, MonitorBound, 0, "(Deprecated) Bound Monitor population") \ 699 range(0, max_jint) \ 700 \ 701 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 702 "Percentage of used monitors before triggering cleanup " \ 703 "safepoint which deflates monitors (0 is off). " \ 704 "The check is performed on GuaranteedSafepointInterval.") \ 705 range(0, 100) \ 706 \ 707 experimental(intx, hashCode, 5, \ 708 "(Unstable) select hashCode generation algorithm") \ 709 \ 710 product(bool, FilterSpuriousWakeups, true, \ 711 "When true prevents OS-level spurious, or premature, wakeups " \ 712 "from Object.wait (Ignored for Windows)") \ 713 \ 714 develop(bool, UsePthreads, false, \ 715 "Use pthread-based instead of libthread-based synchronization " \ 716 "(SPARC only)") \ 717 \ 718 product(bool, ReduceSignalUsage, false, \ 719 "Reduce the use of OS signals in Java and/or the VM") \ 720 \ 721 develop(bool, LoadLineNumberTables, true, \ 722 "Tell whether the class file parser loads line number tables") \ 723 \ 724 develop(bool, LoadLocalVariableTables, true, \ 725 "Tell whether the class file parser loads local variable tables") \ 726 \ 727 develop(bool, LoadLocalVariableTypeTables, true, \ 728 "Tell whether the class file parser loads local variable type" \ 729 "tables") \ 730 \ 731 product(bool, AllowUserSignalHandlers, false, \ 732 "Do not complain if the application installs signal handlers " \ 733 "(Solaris & Linux only)") \ 734 \ 735 product(bool, UseSignalChaining, true, \ 736 "Use signal-chaining to invoke signal handlers installed " \ 737 "by the application (Solaris & Linux only)") \ 738 \ 739 product(bool, RestoreMXCSROnJNICalls, false, \ 740 "Restore MXCSR when returning from JNI calls") \ 741 \ 742 product(bool, CheckJNICalls, false, \ 743 "Verify all arguments to JNI calls") \ 744 \ 745 product(bool, UseFastJNIAccessors, true, \ 746 "Use optimized versions of Get<Primitive>Field") \ 747 \ 748 product(intx, MaxJNILocalCapacity, 65536, \ 749 "Maximum allowable local JNI handle capacity to " \ 750 "EnsureLocalCapacity() and PushLocalFrame(), " \ 751 "where <= 0 is unlimited, default: 65536") \ 752 range(min_intx, max_intx) \ 753 \ 754 product(bool, EagerXrunInit, false, \ 755 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 756 "but not all -Xrun libraries may support the state of the VM " \ 757 "at this time") \ 758 \ 759 product(bool, PreserveAllAnnotations, false, \ 760 "Preserve RuntimeInvisibleAnnotations as well " \ 761 "as RuntimeVisibleAnnotations") \ 762 \ 763 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 764 "Number of OutOfMemoryErrors preallocated with backtrace") \ 765 \ 766 product(bool, UseXMMForArrayCopy, false, \ 767 "Use SSE2 MOVQ instruction for Arraycopy") \ 768 \ 769 notproduct(bool, PrintFieldLayout, false, \ 770 "Print field layout for each class") \ 771 \ 772 /* Need to limit the extent of the padding to reasonable size. */\ 773 /* 8K is well beyond the reasonable HW cache line size, even with */\ 774 /* aggressive prefetching, while still leaving the room for segregating */\ 775 /* among the distinct pages. */\ 776 product(intx, ContendedPaddingWidth, 128, \ 777 "How many bytes to pad the fields/classes marked @Contended with")\ 778 range(0, 8192) \ 779 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 780 \ 781 product(bool, EnableContended, true, \ 782 "Enable @Contended annotation support") \ 783 \ 784 product(bool, RestrictContended, true, \ 785 "Restrict @Contended to trusted classes") \ 786 \ 787 product(bool, UseBiasedLocking, true, \ 788 "Enable biased locking in JVM") \ 789 \ 790 product(intx, BiasedLockingStartupDelay, 0, \ 791 "Number of milliseconds to wait before enabling biased locking") \ 792 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 793 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 794 \ 795 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 796 "Print statistics of biased locking in JVM") \ 797 \ 798 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 799 "Threshold of number of revocations per type to try to " \ 800 "rebias all objects in the heap of that type") \ 801 range(0, max_intx) \ 802 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 803 \ 804 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 805 "Threshold of number of revocations per type to permanently " \ 806 "revoke biases of all objects in the heap of that type") \ 807 range(0, max_intx) \ 808 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 809 \ 810 product(intx, BiasedLockingDecayTime, 25000, \ 811 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 812 "type after previous bulk rebias") \ 813 range(500, max_intx) \ 814 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 815 \ 816 product(bool, ExitOnOutOfMemoryError, false, \ 817 "JVM exits on the first occurrence of an out-of-memory error") \ 818 \ 819 product(bool, CrashOnOutOfMemoryError, false, \ 820 "JVM aborts, producing an error log and core/mini dump, on the " \ 821 "first occurrence of an out-of-memory error") \ 822 \ 823 /* tracing */ \ 824 \ 825 develop(bool, StressRewriter, false, \ 826 "Stress linktime bytecode rewriting") \ 827 \ 828 product(ccstr, TraceJVMTI, NULL, \ 829 "Trace flags for JVMTI functions and events") \ 830 \ 831 /* This option can change an EMCP method into an obsolete method. */ \ 832 /* This can affect tests that except specific methods to be EMCP. */ \ 833 /* This option should be used with caution. */ \ 834 product(bool, StressLdcRewrite, false, \ 835 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 836 \ 837 /* change to false by default sometime after Mustang */ \ 838 product(bool, VerifyMergedCPBytecodes, true, \ 839 "Verify bytecodes after RedefineClasses constant pool merging") \ 840 \ 841 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 842 "(Deprecated) Allow redefinition to add and delete private " \ 843 "static or final methods for compatibility with old releases") \ 844 \ 845 develop(bool, TraceBytecodes, false, \ 846 "Trace bytecode execution") \ 847 \ 848 develop(bool, TraceICs, false, \ 849 "Trace inline cache changes") \ 850 \ 851 notproduct(bool, TraceInvocationCounterOverflow, false, \ 852 "Trace method invocation counter overflow") \ 853 \ 854 develop(bool, TraceInlineCacheClearing, false, \ 855 "Trace clearing of inline caches in nmethods") \ 856 \ 857 develop(bool, TraceDependencies, false, \ 858 "Trace dependencies") \ 859 \ 860 develop(bool, VerifyDependencies, trueInDebug, \ 861 "Exercise and verify the compilation dependency mechanism") \ 862 \ 863 develop(bool, TraceNewOopMapGeneration, false, \ 864 "Trace OopMapGeneration") \ 865 \ 866 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 867 "Trace OopMapGeneration: print detailed cell states") \ 868 \ 869 develop(bool, TimeOopMap, false, \ 870 "Time calls to GenerateOopMap::compute_map() in sum") \ 871 \ 872 develop(bool, TimeOopMap2, false, \ 873 "Time calls to GenerateOopMap::compute_map() individually") \ 874 \ 875 develop(bool, TraceOopMapRewrites, false, \ 876 "Trace rewriting of method oops during oop map generation") \ 877 \ 878 develop(bool, TraceICBuffer, false, \ 879 "Trace usage of IC buffer") \ 880 \ 881 develop(bool, TraceCompiledIC, false, \ 882 "Trace changes of compiled IC") \ 883 \ 884 develop(bool, FLSVerifyDictionary, false, \ 885 "Do lots of (expensive) FLS dictionary verification") \ 886 \ 887 \ 888 notproduct(bool, CheckMemoryInitialization, false, \ 889 "Check memory initialization") \ 890 \ 891 product(uintx, ProcessDistributionStride, 4, \ 892 "Stride through processors when distributing processes") \ 893 range(0, max_juint) \ 894 \ 895 develop(bool, TraceFinalizerRegistration, false, \ 896 "Trace registration of final references") \ 897 \ 898 product(bool, IgnoreEmptyClassPaths, false, \ 899 "Ignore empty path elements in -classpath") \ 900 \ 901 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 902 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 903 "Initial size of the boot class loader data metaspace") \ 904 range(30*K, max_uintx/BytesPerWord) \ 905 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 906 \ 907 product(bool, PrintHeapAtSIGBREAK, true, \ 908 "Print heap layout in response to SIGBREAK") \ 909 \ 910 manageable(bool, PrintClassHistogram, false, \ 911 "Print a histogram of class instances") \ 912 \ 913 experimental(double, ObjectCountCutOffPercent, 0.5, \ 914 "The percentage of the used heap that the instances of a class " \ 915 "must occupy for the class to generate a trace event") \ 916 range(0.0, 100.0) \ 917 \ 918 /* JVMTI heap profiling */ \ 919 \ 920 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 921 "Trace JVMTI object tagging calls") \ 922 \ 923 diagnostic(bool, VerifyBeforeIteration, false, \ 924 "Verify memory system before JVMTI iteration") \ 925 \ 926 /* compiler interface */ \ 927 \ 928 develop(bool, CIPrintCompilerName, false, \ 929 "when CIPrint is active, print the name of the active compiler") \ 930 \ 931 diagnostic(bool, CIPrintCompileQueue, false, \ 932 "display the contents of the compile queue whenever a " \ 933 "compilation is enqueued") \ 934 \ 935 develop(bool, CIPrintRequests, false, \ 936 "display every request for compilation") \ 937 \ 938 product(bool, CITime, false, \ 939 "collect timing information for compilation") \ 940 \ 941 develop(bool, CITimeVerbose, false, \ 942 "be more verbose in compilation timings") \ 943 \ 944 develop(bool, CITimeEach, false, \ 945 "display timing information after each successful compilation") \ 946 \ 947 develop(bool, CICountOSR, false, \ 948 "use a separate counter when assigning ids to osr compilations") \ 949 \ 950 develop(bool, CICompileNatives, true, \ 951 "compile native methods if supported by the compiler") \ 952 \ 953 develop_pd(bool, CICompileOSR, \ 954 "compile on stack replacement methods if supported by the " \ 955 "compiler") \ 956 \ 957 develop(bool, CIPrintMethodCodes, false, \ 958 "print method bytecodes of the compiled code") \ 959 \ 960 develop(bool, CIPrintTypeFlow, false, \ 961 "print the results of ciTypeFlow analysis") \ 962 \ 963 develop(bool, CITraceTypeFlow, false, \ 964 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 965 \ 966 develop(intx, OSROnlyBCI, -1, \ 967 "OSR only at this bci. Negative values mean exclude that bci") \ 968 \ 969 /* compiler */ \ 970 \ 971 /* notice: the max range value here is max_jint, not max_intx */ \ 972 /* because of overflow issue */ \ 973 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 974 "Number of compiler threads to run") \ 975 range(0, max_jint) \ 976 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 977 \ 978 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 979 "Dynamically choose the number of parallel compiler threads") \ 980 \ 981 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 982 "Reduce the number of parallel compiler threads when they " \ 983 "are not used") \ 984 \ 985 diagnostic(bool, TraceCompilerThreads, false, \ 986 "Trace creation and removal of compiler threads") \ 987 \ 988 develop(bool, InjectCompilerCreationFailure, false, \ 989 "Inject thread creation failures for " \ 990 "UseDynamicNumberOfCompilerThreads") \ 991 \ 992 develop(bool, UseStackBanging, true, \ 993 "use stack banging for stack overflow checks (required for " \ 994 "proper StackOverflow handling; disable only to measure cost " \ 995 "of stackbanging)") \ 996 \ 997 develop(bool, GenerateSynchronizationCode, true, \ 998 "generate locking/unlocking code for synchronized methods and " \ 999 "monitors") \ 1000 \ 1001 develop(bool, GenerateRangeChecks, true, \ 1002 "Generate range checks for array accesses") \ 1003 \ 1004 diagnostic_pd(bool, ImplicitNullChecks, \ 1005 "Generate code for implicit null checks") \ 1006 \ 1007 product_pd(bool, TrapBasedNullChecks, \ 1008 "Generate code for null checks that uses a cmp and trap " \ 1009 "instruction raising SIGTRAP. This is only used if an access to" \ 1010 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1011 "ImplicitNullChecks don't work (PPC64).") \ 1012 \ 1013 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1014 "Enable Thread SMR extra validity checks") \ 1015 \ 1016 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1017 "Enable Thread SMR Statistics") \ 1018 \ 1019 product(bool, UseNotificationThread, true, \ 1020 "Use Notification Thread") \ 1021 \ 1022 product(bool, Inline, true, \ 1023 "Enable inlining") \ 1024 \ 1025 product(bool, ClipInlining, true, \ 1026 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1027 \ 1028 develop(bool, UseCHA, true, \ 1029 "Enable CHA") \ 1030 \ 1031 product(bool, UseTypeProfile, true, \ 1032 "Check interpreter profile for historically monomorphic calls") \ 1033 \ 1034 diagnostic(bool, PrintInlining, false, \ 1035 "Print inlining optimizations") \ 1036 \ 1037 product(bool, UsePopCountInstruction, false, \ 1038 "Use population count instruction") \ 1039 \ 1040 develop(bool, EagerInitialization, false, \ 1041 "Eagerly initialize classes if possible") \ 1042 \ 1043 diagnostic(bool, LogTouchedMethods, false, \ 1044 "Log methods which have been ever touched in runtime") \ 1045 \ 1046 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1047 "Print all methods that have been ever touched in runtime") \ 1048 \ 1049 develop(bool, TraceMethodReplacement, false, \ 1050 "Print when methods are replaced do to recompilation") \ 1051 \ 1052 develop(bool, PrintMethodFlushing, false, \ 1053 "Print the nmethods being flushed") \ 1054 \ 1055 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1056 "print statistics about method flushing") \ 1057 \ 1058 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1059 "Number of compiled code invocations after which " \ 1060 "the method is considered as hot by the flusher") \ 1061 range(1, max_jint) \ 1062 \ 1063 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1064 "Minimum number of sweeper passes before an nmethod " \ 1065 "can be flushed") \ 1066 range(0, max_intx) \ 1067 \ 1068 product(bool, UseCodeAging, true, \ 1069 "Insert counter to detect warm methods") \ 1070 \ 1071 diagnostic(bool, StressCodeAging, false, \ 1072 "Start with counters compiled in") \ 1073 \ 1074 develop(bool, StressCodeBuffers, false, \ 1075 "Exercise code buffer expansion and other rare state changes") \ 1076 \ 1077 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1078 "Generate extra debugging information for non-safepoints in " \ 1079 "nmethods") \ 1080 \ 1081 product(bool, PrintVMOptions, false, \ 1082 "Print flags that appeared on the command line") \ 1083 \ 1084 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1085 "Ignore unrecognized VM options") \ 1086 \ 1087 product(bool, PrintCommandLineFlags, false, \ 1088 "Print flags specified on command line or set by ergonomics") \ 1089 \ 1090 product(bool, PrintFlagsInitial, false, \ 1091 "Print all VM flags before argument processing and exit VM") \ 1092 \ 1093 product(bool, PrintFlagsFinal, false, \ 1094 "Print all VM flags after argument and ergonomic processing") \ 1095 \ 1096 notproduct(bool, PrintFlagsWithComments, false, \ 1097 "Print all VM flags with default values and descriptions and " \ 1098 "exit") \ 1099 \ 1100 product(bool, PrintFlagsRanges, false, \ 1101 "Print VM flags and their ranges") \ 1102 \ 1103 diagnostic(bool, SerializeVMOutput, true, \ 1104 "Use a mutex to serialize output to tty and LogFile") \ 1105 \ 1106 diagnostic(bool, DisplayVMOutput, true, \ 1107 "Display all VM output on the tty, independently of LogVMOutput") \ 1108 \ 1109 diagnostic(bool, LogVMOutput, false, \ 1110 "Save VM output to LogFile") \ 1111 \ 1112 diagnostic(ccstr, LogFile, NULL, \ 1113 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1114 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1115 \ 1116 product(ccstr, ErrorFile, NULL, \ 1117 "If an error occurs, save the error data to this file " \ 1118 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1119 \ 1120 product(bool, ExtensiveErrorReports, \ 1121 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1122 "Error reports are more extensive.") \ 1123 \ 1124 product(bool, DisplayVMOutputToStderr, false, \ 1125 "If DisplayVMOutput is true, display all VM output to stderr") \ 1126 \ 1127 product(bool, DisplayVMOutputToStdout, false, \ 1128 "If DisplayVMOutput is true, display all VM output to stdout") \ 1129 \ 1130 product(bool, ErrorFileToStderr, false, \ 1131 "If true, error data is printed to stderr instead of a file") \ 1132 \ 1133 product(bool, ErrorFileToStdout, false, \ 1134 "If true, error data is printed to stdout instead of a file") \ 1135 \ 1136 product(bool, UseHeavyMonitors, false, \ 1137 "use heavyweight instead of lightweight Java monitors") \ 1138 \ 1139 product(bool, PrintStringTableStatistics, false, \ 1140 "print statistics about the StringTable and SymbolTable") \ 1141 \ 1142 diagnostic(bool, VerifyStringTableAtExit, false, \ 1143 "verify StringTable contents at exit") \ 1144 \ 1145 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1146 "print histogram of the symbol table") \ 1147 \ 1148 notproduct(bool, ExitVMOnVerifyError, false, \ 1149 "standard exit from VM if bytecode verify error " \ 1150 "(only in debug mode)") \ 1151 \ 1152 diagnostic(ccstr, AbortVMOnException, NULL, \ 1153 "Call fatal if this exception is thrown. Example: " \ 1154 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1155 \ 1156 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1157 "Call fatal if the exception pointed by AbortVMOnException " \ 1158 "has this message") \ 1159 \ 1160 develop(bool, DebugVtables, false, \ 1161 "add debugging code to vtable dispatch") \ 1162 \ 1163 notproduct(bool, PrintVtableStats, false, \ 1164 "print vtables stats at end of run") \ 1165 \ 1166 develop(bool, TraceCreateZombies, false, \ 1167 "trace creation of zombie nmethods") \ 1168 \ 1169 product(bool, RangeCheckElimination, true, \ 1170 "Eliminate range checks") \ 1171 \ 1172 develop_pd(bool, UncommonNullCast, \ 1173 "track occurrences of null in casts; adjust compiler tactics") \ 1174 \ 1175 develop(bool, TypeProfileCasts, true, \ 1176 "treat casts like calls for purposes of type profiling") \ 1177 \ 1178 develop(bool, TraceLivenessGen, false, \ 1179 "Trace the generation of liveness analysis information") \ 1180 \ 1181 notproduct(bool, TraceLivenessQuery, false, \ 1182 "Trace queries of liveness analysis information") \ 1183 \ 1184 notproduct(bool, CollectIndexSetStatistics, false, \ 1185 "Collect information about IndexSets") \ 1186 \ 1187 develop(bool, UseLoopSafepoints, true, \ 1188 "Generate Safepoint nodes in every loop") \ 1189 \ 1190 develop(intx, FastAllocateSizeLimit, 128*K, \ 1191 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1192 "Inline allocations larger than this in doublewords must go slow")\ 1193 \ 1194 product_pd(bool, CompactStrings, \ 1195 "Enable Strings to use single byte chars in backing store") \ 1196 \ 1197 product_pd(uintx, TypeProfileLevel, \ 1198 "=XYZ, with Z: Type profiling of arguments at call; " \ 1199 "Y: Type profiling of return value at call; " \ 1200 "X: Type profiling of parameters to methods; " \ 1201 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1202 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1203 \ 1204 product(intx, TypeProfileArgsLimit, 2, \ 1205 "max number of call arguments to consider for type profiling") \ 1206 range(0, 16) \ 1207 \ 1208 product(intx, TypeProfileParmsLimit, 2, \ 1209 "max number of incoming parameters to consider for type profiling"\ 1210 ", -1 for all") \ 1211 range(-1, 64) \ 1212 \ 1213 /* statistics */ \ 1214 develop(bool, CountCompiledCalls, false, \ 1215 "Count method invocations") \ 1216 \ 1217 notproduct(bool, CountRuntimeCalls, false, \ 1218 "Count VM runtime calls") \ 1219 \ 1220 develop(bool, CountJNICalls, false, \ 1221 "Count jni method invocations") \ 1222 \ 1223 notproduct(bool, CountJVMCalls, false, \ 1224 "Count jvm method invocations") \ 1225 \ 1226 notproduct(bool, CountRemovableExceptions, false, \ 1227 "Count exceptions that could be replaced by branches due to " \ 1228 "inlining") \ 1229 \ 1230 notproduct(bool, ICMissHistogram, false, \ 1231 "Produce histogram of IC misses") \ 1232 \ 1233 /* interpreter */ \ 1234 product_pd(bool, RewriteBytecodes, \ 1235 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1236 \ 1237 product_pd(bool, RewriteFrequentPairs, \ 1238 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1239 \ 1240 diagnostic(bool, PrintInterpreter, false, \ 1241 "Print the generated interpreter code") \ 1242 \ 1243 product(bool, UseInterpreter, true, \ 1244 "Use interpreter for non-compiled methods") \ 1245 \ 1246 develop(bool, UseFastSignatureHandlers, true, \ 1247 "Use fast signature handlers for native calls") \ 1248 \ 1249 product(bool, UseLoopCounter, true, \ 1250 "Increment invocation counter on backward branch") \ 1251 \ 1252 product_pd(bool, UseOnStackReplacement, \ 1253 "Use on stack replacement, calls runtime if invoc. counter " \ 1254 "overflows in loop") \ 1255 \ 1256 notproduct(bool, TraceOnStackReplacement, false, \ 1257 "Trace on stack replacement") \ 1258 \ 1259 product_pd(bool, PreferInterpreterNativeStubs, \ 1260 "Use always interpreter stubs for native methods invoked via " \ 1261 "interpreter") \ 1262 \ 1263 develop(bool, CountBytecodes, false, \ 1264 "Count number of bytecodes executed") \ 1265 \ 1266 develop(bool, PrintBytecodeHistogram, false, \ 1267 "Print histogram of the executed bytecodes") \ 1268 \ 1269 develop(bool, PrintBytecodePairHistogram, false, \ 1270 "Print histogram of the executed bytecode pairs") \ 1271 \ 1272 diagnostic(bool, PrintSignatureHandlers, false, \ 1273 "Print code generated for native method signature handlers") \ 1274 \ 1275 develop(bool, VerifyOops, false, \ 1276 "Do plausibility checks for oops") \ 1277 \ 1278 develop(bool, CheckUnhandledOops, false, \ 1279 "Check for unhandled oops in VM code") \ 1280 \ 1281 develop(bool, VerifyJNIFields, trueInDebug, \ 1282 "Verify jfieldIDs for instance fields") \ 1283 \ 1284 notproduct(bool, VerifyJNIEnvThread, false, \ 1285 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1286 "from JNI") \ 1287 \ 1288 develop(bool, VerifyFPU, false, \ 1289 "Verify FPU state (check for NaN's, etc.)") \ 1290 \ 1291 develop(bool, VerifyThread, false, \ 1292 "Watch the thread register for corruption (SPARC only)") \ 1293 \ 1294 develop(bool, VerifyActivationFrameSize, false, \ 1295 "Verify that activation frame didn't become smaller than its " \ 1296 "minimal size") \ 1297 \ 1298 develop(bool, TraceFrequencyInlining, false, \ 1299 "Trace frequency based inlining") \ 1300 \ 1301 develop_pd(bool, InlineIntrinsics, \ 1302 "Inline intrinsics that can be statically resolved") \ 1303 \ 1304 product_pd(bool, ProfileInterpreter, \ 1305 "Profile at the bytecode level during interpretation") \ 1306 \ 1307 develop(bool, TraceProfileInterpreter, false, \ 1308 "Trace profiling at the bytecode level during interpretation. " \ 1309 "This outputs the profiling information collected to improve " \ 1310 "jit compilation.") \ 1311 \ 1312 develop_pd(bool, ProfileTraps, \ 1313 "Profile deoptimization traps at the bytecode level") \ 1314 \ 1315 product(intx, ProfileMaturityPercentage, 20, \ 1316 "number of method invocations/branches (expressed as % of " \ 1317 "CompileThreshold) before using the method's profile") \ 1318 range(0, 100) \ 1319 \ 1320 diagnostic(bool, PrintMethodData, false, \ 1321 "Print the results of +ProfileInterpreter at end of run") \ 1322 \ 1323 develop(bool, VerifyDataPointer, trueInDebug, \ 1324 "Verify the method data pointer during interpreter profiling") \ 1325 \ 1326 develop(bool, VerifyCompiledCode, false, \ 1327 "Include miscellaneous runtime verifications in nmethod code; " \ 1328 "default off because it disturbs nmethod size heuristics") \ 1329 \ 1330 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1331 "Manually make GC thread crash then dump java stack trace; " \ 1332 "Test only") \ 1333 \ 1334 /* compilation */ \ 1335 product(bool, UseCompiler, true, \ 1336 "Use Just-In-Time compilation") \ 1337 \ 1338 product(bool, UseCounterDecay, true, \ 1339 "Adjust recompilation counters") \ 1340 \ 1341 develop(intx, CounterHalfLifeTime, 30, \ 1342 "Half-life time of invocation counters (in seconds)") \ 1343 \ 1344 develop(intx, CounterDecayMinIntervalLength, 500, \ 1345 "The minimum interval (in milliseconds) between invocation of " \ 1346 "CounterDecay") \ 1347 \ 1348 product(bool, AlwaysCompileLoopMethods, false, \ 1349 "When using recompilation, never interpret methods " \ 1350 "containing loops") \ 1351 \ 1352 product(bool, DontCompileHugeMethods, true, \ 1353 "Do not compile methods > HugeMethodLimit") \ 1354 \ 1355 /* Bytecode escape analysis estimation. */ \ 1356 product(bool, EstimateArgEscape, true, \ 1357 "Analyze bytecodes to estimate escape state of arguments") \ 1358 \ 1359 product(intx, BCEATraceLevel, 0, \ 1360 "How much tracing to do of bytecode escape analysis estimates " \ 1361 "(0-3)") \ 1362 range(0, 3) \ 1363 \ 1364 product(intx, MaxBCEAEstimateLevel, 5, \ 1365 "Maximum number of nested calls that are analyzed by BC EA") \ 1366 range(0, max_jint) \ 1367 \ 1368 product(intx, MaxBCEAEstimateSize, 150, \ 1369 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1370 range(0, max_jint) \ 1371 \ 1372 product(intx, AllocatePrefetchStyle, 1, \ 1373 "0 = no prefetch, " \ 1374 "1 = generate prefetch instructions for each allocation, " \ 1375 "2 = use TLAB watermark to gate allocation prefetch, " \ 1376 "3 = generate one prefetch instruction per cache line") \ 1377 range(0, 3) \ 1378 \ 1379 product(intx, AllocatePrefetchDistance, -1, \ 1380 "Distance to prefetch ahead of allocation pointer. " \ 1381 "-1: use system-specific value (automatically determined") \ 1382 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\ 1383 \ 1384 product(intx, AllocatePrefetchLines, 3, \ 1385 "Number of lines to prefetch ahead of array allocation pointer") \ 1386 range(1, 64) \ 1387 \ 1388 product(intx, AllocateInstancePrefetchLines, 1, \ 1389 "Number of lines to prefetch ahead of instance allocation " \ 1390 "pointer") \ 1391 range(1, 64) \ 1392 \ 1393 product(intx, AllocatePrefetchStepSize, 16, \ 1394 "Step size in bytes of sequential prefetch instructions") \ 1395 range(1, 512) \ 1396 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1397 \ 1398 product(intx, AllocatePrefetchInstr, 0, \ 1399 "Select instruction to prefetch ahead of allocation pointer") \ 1400 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1401 \ 1402 /* deoptimization */ \ 1403 develop(bool, TraceDeoptimization, false, \ 1404 "Trace deoptimization") \ 1405 \ 1406 develop(bool, PrintDeoptimizationDetails, false, \ 1407 "Print more information about deoptimization") \ 1408 \ 1409 develop(bool, DebugDeoptimization, false, \ 1410 "Tracing various information while debugging deoptimization") \ 1411 \ 1412 product(intx, SelfDestructTimer, 0, \ 1413 "Will cause VM to terminate after a given time (in minutes) " \ 1414 "(0 means off)") \ 1415 range(0, max_intx) \ 1416 \ 1417 product(intx, MaxJavaStackTraceDepth, 1024, \ 1418 "The maximum number of lines in the stack trace for Java " \ 1419 "exceptions (0 means all)") \ 1420 range(0, max_jint/2) \ 1421 \ 1422 /* notice: the max range value here is max_jint, not max_intx */ \ 1423 /* because of overflow issue */ \ 1424 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1425 "Guarantee a safepoint (at least) every so many milliseconds " \ 1426 "(0 means none)") \ 1427 range(0, max_jint) \ 1428 \ 1429 product(intx, SafepointTimeoutDelay, 10000, \ 1430 "Delay in milliseconds for option SafepointTimeout") \ 1431 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1432 NOT_LP64(range(0, max_intx)) \ 1433 \ 1434 product(intx, NmethodSweepActivity, 10, \ 1435 "Removes cold nmethods from code cache if > 0. Higher values " \ 1436 "result in more aggressive sweeping") \ 1437 range(0, 2000) \ 1438 \ 1439 notproduct(bool, LogSweeper, false, \ 1440 "Keep a ring buffer of sweeper activity") \ 1441 \ 1442 notproduct(intx, SweeperLogEntries, 1024, \ 1443 "Number of records in the ring buffer of sweeper activity") \ 1444 \ 1445 notproduct(intx, MemProfilingInterval, 500, \ 1446 "Time between each invocation of the MemProfiler") \ 1447 \ 1448 develop(intx, MallocCatchPtr, -1, \ 1449 "Hit breakpoint when mallocing/freeing this pointer") \ 1450 \ 1451 notproduct(ccstrlist, SuppressErrorAt, "", \ 1452 "List of assertions (file:line) to muzzle") \ 1453 \ 1454 develop(intx, StackPrintLimit, 100, \ 1455 "number of stack frames to print in VM-level stack dump") \ 1456 \ 1457 notproduct(intx, MaxElementPrintSize, 256, \ 1458 "maximum number of elements to print") \ 1459 \ 1460 notproduct(intx, MaxSubklassPrintSize, 4, \ 1461 "maximum number of subklasses to print when printing klass") \ 1462 \ 1463 product(intx, MaxInlineLevel, 15, \ 1464 "maximum number of nested calls that are inlined") \ 1465 range(0, max_jint) \ 1466 \ 1467 product(intx, MaxRecursiveInlineLevel, 1, \ 1468 "maximum number of nested recursive calls that are inlined") \ 1469 range(0, max_jint) \ 1470 \ 1471 develop(intx, MaxForceInlineLevel, 100, \ 1472 "maximum number of nested calls that are forced for inlining " \ 1473 "(using CompileCommand or marked w/ @ForceInline)") \ 1474 range(0, max_jint) \ 1475 \ 1476 product_pd(intx, InlineSmallCode, \ 1477 "Only inline already compiled methods if their code size is " \ 1478 "less than this") \ 1479 range(0, max_jint) \ 1480 \ 1481 product(intx, MaxInlineSize, 35, \ 1482 "The maximum bytecode size of a method to be inlined") \ 1483 range(0, max_jint) \ 1484 \ 1485 product_pd(intx, FreqInlineSize, \ 1486 "The maximum bytecode size of a frequent method to be inlined") \ 1487 range(0, max_jint) \ 1488 \ 1489 product(intx, MaxTrivialSize, 6, \ 1490 "The maximum bytecode size of a trivial method to be inlined") \ 1491 range(0, max_jint) \ 1492 \ 1493 product(intx, MinInliningThreshold, 250, \ 1494 "The minimum invocation count a method needs to have to be " \ 1495 "inlined") \ 1496 range(0, max_jint) \ 1497 \ 1498 develop(intx, MethodHistogramCutoff, 100, \ 1499 "The cutoff value for method invocation histogram (+CountCalls)") \ 1500 \ 1501 develop(intx, DontYieldALotInterval, 10, \ 1502 "Interval between which yields will be dropped (milliseconds)") \ 1503 \ 1504 notproduct(intx, DeoptimizeALotInterval, 5, \ 1505 "Number of exits until DeoptimizeALot kicks in") \ 1506 \ 1507 notproduct(intx, ZombieALotInterval, 5, \ 1508 "Number of exits until ZombieALot kicks in") \ 1509 \ 1510 diagnostic(uintx, MallocMaxTestWords, 0, \ 1511 "If non-zero, maximum number of words that malloc/realloc can " \ 1512 "allocate (for testing only)") \ 1513 range(0, max_uintx) \ 1514 \ 1515 product(intx, TypeProfileWidth, 2, \ 1516 "Number of receiver types to record in call/cast profile") \ 1517 range(0, 8) \ 1518 \ 1519 develop(intx, BciProfileWidth, 2, \ 1520 "Number of return bci's to record in ret profile") \ 1521 \ 1522 product(intx, PerMethodRecompilationCutoff, 400, \ 1523 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1524 range(-1, max_intx) \ 1525 \ 1526 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1527 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1528 range(-1, max_intx) \ 1529 \ 1530 product(intx, PerMethodTrapLimit, 100, \ 1531 "Limit on traps (of one kind) in a method (includes inlines)") \ 1532 range(0, max_jint) \ 1533 \ 1534 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1535 "Limit on speculative traps (of one kind) in a method " \ 1536 "(includes inlines)") \ 1537 range(0, max_jint) \ 1538 \ 1539 product(intx, PerBytecodeTrapLimit, 4, \ 1540 "Limit on traps (of one kind) at a particular BCI") \ 1541 range(0, max_jint) \ 1542 \ 1543 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1544 "Extra method data trap entries for speculation") \ 1545 \ 1546 develop(intx, InlineFrequencyRatio, 20, \ 1547 "Ratio of call site execution to caller method invocation") \ 1548 range(0, max_jint) \ 1549 \ 1550 diagnostic_pd(intx, InlineFrequencyCount, \ 1551 "Count of call site execution necessary to trigger frequent " \ 1552 "inlining") \ 1553 range(0, max_jint) \ 1554 \ 1555 develop(intx, InlineThrowCount, 50, \ 1556 "Force inlining of interpreted methods that throw this often") \ 1557 range(0, max_jint) \ 1558 \ 1559 develop(intx, InlineThrowMaxSize, 200, \ 1560 "Force inlining of throwing methods smaller than this") \ 1561 range(0, max_jint) \ 1562 \ 1563 develop(intx, ProfilerNodeSize, 1024, \ 1564 "Size in K to allocate for the Profile Nodes of each thread") \ 1565 range(0, 1024) \ 1566 \ 1567 product_pd(size_t, MetaspaceSize, \ 1568 "Initial threshold (in bytes) at which a garbage collection " \ 1569 "is done to reduce Metaspace usage") \ 1570 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1571 \ 1572 product(size_t, MaxMetaspaceSize, max_uintx, \ 1573 "Maximum size of Metaspaces (in bytes)") \ 1574 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1575 \ 1576 product(size_t, CompressedClassSpaceSize, 1*G, \ 1577 "Maximum size of class area in Metaspace when compressed " \ 1578 "class pointers are used") \ 1579 range(1*M, 3*G) \ 1580 \ 1581 manageable(uintx, MinHeapFreeRatio, 40, \ 1582 "The minimum percentage of heap free after GC to avoid expansion."\ 1583 " For most GCs this applies to the old generation. In G1 and" \ 1584 " ParallelGC it applies to the whole heap.") \ 1585 range(0, 100) \ 1586 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1587 \ 1588 manageable(uintx, MaxHeapFreeRatio, 70, \ 1589 "The maximum percentage of heap free after GC to avoid shrinking."\ 1590 " For most GCs this applies to the old generation. In G1 and" \ 1591 " ParallelGC it applies to the whole heap.") \ 1592 range(0, 100) \ 1593 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1594 \ 1595 product(bool, ShrinkHeapInSteps, true, \ 1596 "When disabled, informs the GC to shrink the java heap directly" \ 1597 " to the target size at the next full GC rather than requiring" \ 1598 " smaller steps during multiple full GCs.") \ 1599 \ 1600 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1601 "Number of milliseconds per MB of free space in the heap") \ 1602 range(0, max_intx) \ 1603 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1604 \ 1605 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1606 "The minimum change in heap space due to GC (in bytes)") \ 1607 range(0, max_uintx) \ 1608 \ 1609 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1610 "The minimum expansion of Metaspace (in bytes)") \ 1611 range(0, max_uintx) \ 1612 \ 1613 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1614 "The maximum percentage of Metaspace free after GC to avoid " \ 1615 "shrinking") \ 1616 range(0, 100) \ 1617 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1618 \ 1619 product(uintx, MinMetaspaceFreeRatio, 40, \ 1620 "The minimum percentage of Metaspace free after GC to avoid " \ 1621 "expansion") \ 1622 range(0, 99) \ 1623 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1624 \ 1625 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1626 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1627 range(0, max_uintx) \ 1628 \ 1629 /* stack parameters */ \ 1630 product_pd(intx, StackYellowPages, \ 1631 "Number of yellow zone (recoverable overflows) pages of size " \ 1632 "4KB. If pages are bigger yellow zone is aligned up.") \ 1633 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1634 \ 1635 product_pd(intx, StackRedPages, \ 1636 "Number of red zone (unrecoverable overflows) pages of size " \ 1637 "4KB. If pages are bigger red zone is aligned up.") \ 1638 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1639 \ 1640 product_pd(intx, StackReservedPages, \ 1641 "Number of reserved zone (reserved to annotated methods) pages" \ 1642 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1643 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1644 \ 1645 product(bool, RestrictReservedStack, true, \ 1646 "Restrict @ReservedStackAccess to trusted classes") \ 1647 \ 1648 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1649 product_pd(intx, StackShadowPages, \ 1650 "Number of shadow zone (for overflow checking) pages of size " \ 1651 "4KB. If pages are bigger shadow zone is aligned up. " \ 1652 "This should exceed the depth of the VM and native call stack.") \ 1653 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1654 \ 1655 product_pd(intx, ThreadStackSize, \ 1656 "Thread Stack Size (in Kbytes)") \ 1657 range(0, 1 * M) \ 1658 \ 1659 product_pd(intx, VMThreadStackSize, \ 1660 "Non-Java Thread Stack Size (in Kbytes)") \ 1661 range(0, max_intx/(1 * K)) \ 1662 \ 1663 product_pd(intx, CompilerThreadStackSize, \ 1664 "Compiler Thread Stack Size (in Kbytes)") \ 1665 range(0, max_intx/(1 * K)) \ 1666 \ 1667 develop_pd(size_t, JVMInvokeMethodSlack, \ 1668 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1669 \ 1670 /* code cache parameters */ \ 1671 develop_pd(uintx, CodeCacheSegmentSize, \ 1672 "Code cache segment size (in bytes) - smallest unit of " \ 1673 "allocation") \ 1674 range(1, 1024) \ 1675 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1676 \ 1677 develop_pd(intx, CodeEntryAlignment, \ 1678 "Code entry alignment for generated code (in bytes)") \ 1679 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1680 \ 1681 product_pd(intx, OptoLoopAlignment, \ 1682 "Align inner loops to zero relative to this modulus") \ 1683 range(1, 16) \ 1684 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1685 \ 1686 product_pd(uintx, InitialCodeCacheSize, \ 1687 "Initial code cache size (in bytes)") \ 1688 range(os::vm_page_size(), max_uintx) \ 1689 \ 1690 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1691 "Minimum code cache size (in bytes) required to start VM.") \ 1692 range(0, max_uintx) \ 1693 \ 1694 product(bool, SegmentedCodeCache, false, \ 1695 "Use a segmented code cache") \ 1696 \ 1697 product_pd(uintx, ReservedCodeCacheSize, \ 1698 "Reserved code cache size (in bytes) - maximum code cache size") \ 1699 range(os::vm_page_size(), max_uintx) \ 1700 \ 1701 product_pd(uintx, NonProfiledCodeHeapSize, \ 1702 "Size of code heap with non-profiled methods (in bytes)") \ 1703 range(0, max_uintx) \ 1704 \ 1705 product_pd(uintx, ProfiledCodeHeapSize, \ 1706 "Size of code heap with profiled methods (in bytes)") \ 1707 range(0, max_uintx) \ 1708 \ 1709 product_pd(uintx, NonNMethodCodeHeapSize, \ 1710 "Size of code heap with non-nmethods (in bytes)") \ 1711 range(os::vm_page_size(), max_uintx) \ 1712 \ 1713 product_pd(uintx, CodeCacheExpansionSize, \ 1714 "Code cache expansion size (in bytes)") \ 1715 range(32*K, max_uintx) \ 1716 \ 1717 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1718 "Minimum number of segments in a code cache block") \ 1719 range(1, 100) \ 1720 \ 1721 notproduct(bool, ExitOnFullCodeCache, false, \ 1722 "Exit the VM if we fill the code cache") \ 1723 \ 1724 product(bool, UseCodeCacheFlushing, true, \ 1725 "Remove cold/old nmethods from the code cache") \ 1726 \ 1727 product(uintx, StartAggressiveSweepingAt, 10, \ 1728 "Start aggressive sweeping if X[%] of the code cache is free." \ 1729 "Segmented code cache: X[%] of the non-profiled heap." \ 1730 "Non-segmented code cache: X[%] of the total code cache") \ 1731 range(0, 100) \ 1732 \ 1733 /* AOT parameters */ \ 1734 experimental(bool, UseAOT, false, \ 1735 "Use AOT compiled files") \ 1736 \ 1737 experimental(ccstrlist, AOTLibrary, NULL, \ 1738 "AOT library") \ 1739 \ 1740 experimental(bool, PrintAOT, false, \ 1741 "Print used AOT klasses and methods") \ 1742 \ 1743 notproduct(bool, PrintAOTStatistics, false, \ 1744 "Print AOT statistics") \ 1745 \ 1746 diagnostic(bool, UseAOTStrictLoading, false, \ 1747 "Exit the VM if any of the AOT libraries has invalid config") \ 1748 \ 1749 product(bool, CalculateClassFingerprint, false, \ 1750 "Calculate class fingerprint") \ 1751 \ 1752 /* interpreter debugging */ \ 1753 develop(intx, BinarySwitchThreshold, 5, \ 1754 "Minimal number of lookupswitch entries for rewriting to binary " \ 1755 "switch") \ 1756 \ 1757 develop(intx, StopInterpreterAt, 0, \ 1758 "Stop interpreter execution at specified bytecode number") \ 1759 \ 1760 develop(intx, TraceBytecodesAt, 0, \ 1761 "Trace bytecodes starting with specified bytecode number") \ 1762 \ 1763 /* compiler interface */ \ 1764 develop(intx, CIStart, 0, \ 1765 "The id of the first compilation to permit") \ 1766 \ 1767 develop(intx, CIStop, max_jint, \ 1768 "The id of the last compilation to permit") \ 1769 \ 1770 develop(intx, CIStartOSR, 0, \ 1771 "The id of the first osr compilation to permit " \ 1772 "(CICountOSR must be on)") \ 1773 \ 1774 develop(intx, CIStopOSR, max_jint, \ 1775 "The id of the last osr compilation to permit " \ 1776 "(CICountOSR must be on)") \ 1777 \ 1778 develop(intx, CIBreakAtOSR, -1, \ 1779 "The id of osr compilation to break at") \ 1780 \ 1781 develop(intx, CIBreakAt, -1, \ 1782 "The id of compilation to break at") \ 1783 \ 1784 product(ccstrlist, CompileOnly, "", \ 1785 "List of methods (pkg/class.name) to restrict compilation to") \ 1786 \ 1787 product(ccstr, CompileCommandFile, NULL, \ 1788 "Read compiler commands from this file [.hotspot_compiler]") \ 1789 \ 1790 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1791 "Read compiler directives from this file") \ 1792 \ 1793 product(ccstrlist, CompileCommand, "", \ 1794 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1795 \ 1796 develop(bool, ReplayCompiles, false, \ 1797 "Enable replay of compilations from ReplayDataFile") \ 1798 \ 1799 product(ccstr, ReplayDataFile, NULL, \ 1800 "File containing compilation replay information" \ 1801 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1802 \ 1803 product(ccstr, InlineDataFile, NULL, \ 1804 "File containing inlining replay information" \ 1805 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1806 \ 1807 develop(intx, ReplaySuppressInitializers, 2, \ 1808 "Control handling of class initialization during replay: " \ 1809 "0 - don't do anything special; " \ 1810 "1 - treat all class initializers as empty; " \ 1811 "2 - treat class initializers for application classes as empty; " \ 1812 "3 - allow all class initializers to run during bootstrap but " \ 1813 " pretend they are empty after starting replay") \ 1814 range(0, 3) \ 1815 \ 1816 develop(bool, ReplayIgnoreInitErrors, false, \ 1817 "Ignore exceptions thrown during initialization for replay") \ 1818 \ 1819 product(bool, DumpReplayDataOnError, true, \ 1820 "Record replay data for crashing compiler threads") \ 1821 \ 1822 product(bool, CICompilerCountPerCPU, false, \ 1823 "1 compiler thread for log(N CPUs)") \ 1824 \ 1825 notproduct(intx, CICrashAt, -1, \ 1826 "id of compilation to trigger assert in compiler thread for " \ 1827 "the purpose of testing, e.g. generation of replay data") \ 1828 notproduct(bool, CIObjectFactoryVerify, false, \ 1829 "enable potentially expensive verification in ciObjectFactory") \ 1830 \ 1831 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1832 "Abort VM when method had failed to compile.") \ 1833 \ 1834 /* Priorities */ \ 1835 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1836 \ 1837 product(intx, ThreadPriorityPolicy, 0, \ 1838 "0 : Normal. "\ 1839 " VM chooses priorities that are appropriate for normal "\ 1840 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1841 " to normal native priority. Java priorities below " \ 1842 " NORM_PRIORITY map to lower native priority values. On "\ 1843 " Windows applications are allowed to use higher native "\ 1844 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1845 " not use the highest possible native priority, "\ 1846 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1847 " system threads. On Linux thread priorities are ignored "\ 1848 " because the OS does not support static priority in "\ 1849 " SCHED_OTHER scheduling class which is the only choice for "\ 1850 " non-root, non-realtime applications. "\ 1851 "1 : Aggressive. "\ 1852 " Java thread priorities map over to the entire range of "\ 1853 " native thread priorities. Higher Java thread priorities map "\ 1854 " to higher native thread priorities. This policy should be "\ 1855 " used with care, as sometimes it can cause performance "\ 1856 " degradation in the application and/or the entire system. On "\ 1857 " Linux/BSD/macOS this policy requires root privilege or an "\ 1858 " extended capability.") \ 1859 range(0, 1) \ 1860 \ 1861 product(bool, ThreadPriorityVerbose, false, \ 1862 "Print priority changes") \ 1863 \ 1864 product(intx, CompilerThreadPriority, -1, \ 1865 "The native priority at which compiler threads should run " \ 1866 "(-1 means no change)") \ 1867 range(min_jint, max_jint) \ 1868 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1869 \ 1870 product(intx, VMThreadPriority, -1, \ 1871 "The native priority at which the VM thread should run " \ 1872 "(-1 means no change)") \ 1873 range(-1, 127) \ 1874 \ 1875 product(intx, JavaPriority1_To_OSPriority, -1, \ 1876 "Map Java priorities to OS priorities") \ 1877 range(-1, 127) \ 1878 \ 1879 product(intx, JavaPriority2_To_OSPriority, -1, \ 1880 "Map Java priorities to OS priorities") \ 1881 range(-1, 127) \ 1882 \ 1883 product(intx, JavaPriority3_To_OSPriority, -1, \ 1884 "Map Java priorities to OS priorities") \ 1885 range(-1, 127) \ 1886 \ 1887 product(intx, JavaPriority4_To_OSPriority, -1, \ 1888 "Map Java priorities to OS priorities") \ 1889 range(-1, 127) \ 1890 \ 1891 product(intx, JavaPriority5_To_OSPriority, -1, \ 1892 "Map Java priorities to OS priorities") \ 1893 range(-1, 127) \ 1894 \ 1895 product(intx, JavaPriority6_To_OSPriority, -1, \ 1896 "Map Java priorities to OS priorities") \ 1897 range(-1, 127) \ 1898 \ 1899 product(intx, JavaPriority7_To_OSPriority, -1, \ 1900 "Map Java priorities to OS priorities") \ 1901 range(-1, 127) \ 1902 \ 1903 product(intx, JavaPriority8_To_OSPriority, -1, \ 1904 "Map Java priorities to OS priorities") \ 1905 range(-1, 127) \ 1906 \ 1907 product(intx, JavaPriority9_To_OSPriority, -1, \ 1908 "Map Java priorities to OS priorities") \ 1909 range(-1, 127) \ 1910 \ 1911 product(intx, JavaPriority10_To_OSPriority,-1, \ 1912 "Map Java priorities to OS priorities") \ 1913 range(-1, 127) \ 1914 \ 1915 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1916 "Java thread priority 10 maps to critical scheduling priority") \ 1917 \ 1918 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1919 "Compiler thread(s) run at critical scheduling priority") \ 1920 \ 1921 develop(intx, NewCodeParameter, 0, \ 1922 "Testing Only: Create a dedicated integer parameter before " \ 1923 "putback") \ 1924 \ 1925 /* new oopmap storage allocation */ \ 1926 develop(intx, MinOopMapAllocation, 8, \ 1927 "Minimum number of OopMap entries in an OopMapSet") \ 1928 \ 1929 /* Background Compilation */ \ 1930 develop(intx, LongCompileThreshold, 50, \ 1931 "Used with +TraceLongCompiles") \ 1932 \ 1933 /* recompilation */ \ 1934 product_pd(intx, CompileThreshold, \ 1935 "number of interpreted method invocations before (re-)compiling") \ 1936 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1937 \ 1938 product(double, CompileThresholdScaling, 1.0, \ 1939 "Factor to control when first compilation happens " \ 1940 "(both with and without tiered compilation): " \ 1941 "values greater than 1.0 delay counter overflow, " \ 1942 "values between 0 and 1.0 rush counter overflow, " \ 1943 "value of 1.0 leaves compilation thresholds unchanged " \ 1944 "value of 0.0 is equivalent to -Xint. " \ 1945 "" \ 1946 "Flag can be set as per-method option. " \ 1947 "If a value is specified for a method, compilation thresholds " \ 1948 "for that method are scaled by both the value of the global flag "\ 1949 "and the value of the per-method flag.") \ 1950 range(0.0, DBL_MAX) \ 1951 \ 1952 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1953 "Interpreter (tier 0) invocation notification frequency") \ 1954 range(0, 30) \ 1955 \ 1956 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 1957 "C1 without MDO (tier 2) invocation notification frequency") \ 1958 range(0, 30) \ 1959 \ 1960 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 1961 "C1 with MDO profiling (tier 3) invocation notification " \ 1962 "frequency") \ 1963 range(0, 30) \ 1964 \ 1965 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 1966 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 1967 range(0, 30) \ 1968 \ 1969 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 1970 "Interpreter (tier 0) invocation notification frequency") \ 1971 range(0, 30) \ 1972 \ 1973 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 1974 "C1 without MDO (tier 2) invocation notification frequency") \ 1975 range(0, 30) \ 1976 \ 1977 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 1978 "C1 with MDO profiling (tier 3) invocation notification " \ 1979 "frequency") \ 1980 range(0, 30) \ 1981 \ 1982 product(intx, Tier2CompileThreshold, 0, \ 1983 "threshold at which tier 2 compilation is invoked") \ 1984 range(0, max_jint) \ 1985 \ 1986 product(intx, Tier2BackEdgeThreshold, 0, \ 1987 "Back edge threshold at which tier 2 compilation is invoked") \ 1988 range(0, max_jint) \ 1989 \ 1990 product(intx, Tier3InvocationThreshold, 200, \ 1991 "Compile if number of method invocations crosses this " \ 1992 "threshold") \ 1993 range(0, max_jint) \ 1994 \ 1995 product(intx, Tier3MinInvocationThreshold, 100, \ 1996 "Minimum invocation to compile at tier 3") \ 1997 range(0, max_jint) \ 1998 \ 1999 product(intx, Tier3CompileThreshold, 2000, \ 2000 "Threshold at which tier 3 compilation is invoked (invocation " \ 2001 "minimum must be satisfied)") \ 2002 range(0, max_jint) \ 2003 \ 2004 product(intx, Tier3BackEdgeThreshold, 60000, \ 2005 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2006 range(0, max_jint) \ 2007 \ 2008 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2009 "Compile if number of method invocations crosses this " \ 2010 "threshold if coming from AOT") \ 2011 range(0, max_jint) \ 2012 \ 2013 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2014 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2015 range(0, max_jint) \ 2016 \ 2017 product(intx, Tier3AOTCompileThreshold, 15000, \ 2018 "Threshold at which tier 3 compilation is invoked (invocation " \ 2019 "minimum must be satisfied) if coming from AOT") \ 2020 range(0, max_jint) \ 2021 \ 2022 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2023 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2024 "if coming from AOT") \ 2025 range(0, max_jint) \ 2026 \ 2027 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \ 2028 "Switch to interpreter to profile if the number of method " \ 2029 "invocations crosses this threshold if coming from AOT " \ 2030 "(applicable only with " \ 2031 "CompilationMode=high-only|high-only-quick-internal)") \ 2032 range(0, max_jint) \ 2033 \ 2034 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \ 2035 "Minimum number of invocations to switch to interpreter " \ 2036 "to profile if coming from AOT " \ 2037 "(applicable only with " \ 2038 "CompilationMode=high-only|high-only-quick-internal)") \ 2039 range(0, max_jint) \ 2040 \ 2041 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \ 2042 "Threshold at which to switch to interpreter to profile " \ 2043 "if coming from AOT " \ 2044 "(invocation minimum must be satisfied, " \ 2045 "applicable only with " \ 2046 "CompilationMode=high-only|high-only-quick-internal)") \ 2047 range(0, max_jint) \ 2048 \ 2049 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \ 2050 "Back edge threshold at which to switch to interpreter " \ 2051 "to profile if coming from AOT " \ 2052 "(applicable only with " \ 2053 "CompilationMode=high-only|high-only-quick-internal)") \ 2054 range(0, max_jint) \ 2055 \ 2056 product(intx, Tier4InvocationThreshold, 5000, \ 2057 "Compile if number of method invocations crosses this " \ 2058 "threshold") \ 2059 range(0, max_jint) \ 2060 \ 2061 product(intx, Tier4MinInvocationThreshold, 600, \ 2062 "Minimum invocation to compile at tier 4") \ 2063 range(0, max_jint) \ 2064 \ 2065 product(intx, Tier4CompileThreshold, 15000, \ 2066 "Threshold at which tier 4 compilation is invoked (invocation " \ 2067 "minimum must be satisfied)") \ 2068 range(0, max_jint) \ 2069 \ 2070 product(intx, Tier4BackEdgeThreshold, 40000, \ 2071 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2072 range(0, max_jint) \ 2073 \ 2074 diagnostic(intx, Tier40InvocationThreshold, 5000, \ 2075 "Compile if number of method invocations crosses this " \ 2076 "threshold (applicable only with " \ 2077 "CompilationMode=high-only|high-only-quick-internal)") \ 2078 range(0, max_jint) \ 2079 \ 2080 diagnostic(intx, Tier40MinInvocationThreshold, 600, \ 2081 "Minimum number of invocations to compile at tier 4 " \ 2082 "(applicable only with " \ 2083 "CompilationMode=high-only|high-only-quick-internal)") \ 2084 range(0, max_jint) \ 2085 \ 2086 diagnostic(intx, Tier40CompileThreshold, 10000, \ 2087 "Threshold at which tier 4 compilation is invoked (invocation " \ 2088 "minimum must be satisfied, applicable only with " \ 2089 "CompilationMode=high-only|high-only-quick-internal)") \ 2090 range(0, max_jint) \ 2091 \ 2092 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \ 2093 "Back edge threshold at which tier 4 OSR compilation is invoked " \ 2094 "(applicable only with " \ 2095 "CompilationMode=high-only|high-only-quick-internal)") \ 2096 range(0, max_jint) \ 2097 \ 2098 diagnostic(intx, Tier0Delay, 5, \ 2099 "If C2 queue size grows over this amount per compiler thread " \ 2100 "do not start profiling in the interpreter " \ 2101 "(applicable only with " \ 2102 "CompilationMode=high-only|high-only-quick-internal)") \ 2103 range(0, max_jint) \ 2104 \ 2105 product(intx, Tier3DelayOn, 5, \ 2106 "If C2 queue size grows over this amount per compiler thread " \ 2107 "stop compiling at tier 3 and start compiling at tier 2") \ 2108 range(0, max_jint) \ 2109 \ 2110 product(intx, Tier3DelayOff, 2, \ 2111 "If C2 queue size is less than this amount per compiler thread " \ 2112 "allow methods compiled at tier 2 transition to tier 3") \ 2113 range(0, max_jint) \ 2114 \ 2115 product(intx, Tier3LoadFeedback, 5, \ 2116 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2117 "reaches this amount per compiler thread") \ 2118 range(0, max_jint) \ 2119 \ 2120 product(intx, Tier4LoadFeedback, 3, \ 2121 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2122 "reaches this amount per compiler thread") \ 2123 range(0, max_jint) \ 2124 \ 2125 product(intx, TieredCompileTaskTimeout, 50, \ 2126 "Kill compile task if method was not used within " \ 2127 "given timeout in milliseconds") \ 2128 range(0, max_intx) \ 2129 \ 2130 product(intx, TieredStopAtLevel, 4, \ 2131 "Stop at given compilation level") \ 2132 range(0, 4) \ 2133 \ 2134 product(intx, Tier0ProfilingStartPercentage, 200, \ 2135 "Start profiling in interpreter if the counters exceed tier 3 " \ 2136 "thresholds (tier 4 thresholds with " \ 2137 "CompilationMode=high-only|high-only-quick-internal)" \ 2138 "by the specified percentage") \ 2139 range(0, max_jint) \ 2140 \ 2141 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2142 "Increase the compile threshold for C1 compilation if the code " \ 2143 "cache is filled by the specified percentage") \ 2144 range(0, 99) \ 2145 \ 2146 product(intx, TieredRateUpdateMinTime, 1, \ 2147 "Minimum rate sampling interval (in milliseconds)") \ 2148 range(0, max_intx) \ 2149 \ 2150 product(intx, TieredRateUpdateMaxTime, 25, \ 2151 "Maximum rate sampling interval (in milliseconds)") \ 2152 range(0, max_intx) \ 2153 \ 2154 product(ccstr, CompilationMode, "default", \ 2155 "Compilation modes: " \ 2156 "default: normal tiered compilation; " \ 2157 "quick-only: C1-only mode; " \ 2158 "high-only: C2/JVMCI-only mode; " \ 2159 "high-only-quick-internal: C2/JVMCI-only mode, " \ 2160 "with JVMCI compiler compiled with C1.") \ 2161 \ 2162 product_pd(bool, TieredCompilation, \ 2163 "Enable tiered compilation") \ 2164 \ 2165 product(bool, PrintTieredEvents, false, \ 2166 "Print tiered events notifications") \ 2167 \ 2168 product_pd(intx, OnStackReplacePercentage, \ 2169 "NON_TIERED number of method invocations/branches (expressed as " \ 2170 "% of CompileThreshold) before (re-)compiling OSR code") \ 2171 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2172 \ 2173 product(intx, InterpreterProfilePercentage, 33, \ 2174 "NON_TIERED number of method invocations/branches (expressed as " \ 2175 "% of CompileThreshold) before profiling in the interpreter") \ 2176 range(0, 100) \ 2177 \ 2178 develop(intx, DesiredMethodLimit, 8000, \ 2179 "The desired maximum method size (in bytecodes) after inlining") \ 2180 \ 2181 develop(intx, HugeMethodLimit, 8000, \ 2182 "Don't compile methods larger than this if " \ 2183 "+DontCompileHugeMethods") \ 2184 \ 2185 /* Properties for Java libraries */ \ 2186 \ 2187 product(uint64_t, MaxDirectMemorySize, 0, \ 2188 "Maximum total size of NIO direct-buffer allocations") \ 2189 range(0, max_jlong) \ 2190 \ 2191 /* Flags used for temporary code during development */ \ 2192 \ 2193 diagnostic(bool, UseNewCode, false, \ 2194 "Testing Only: Use the new version while testing") \ 2195 \ 2196 diagnostic(bool, UseNewCode2, false, \ 2197 "Testing Only: Use the new version while testing") \ 2198 \ 2199 diagnostic(bool, UseNewCode3, false, \ 2200 "Testing Only: Use the new version while testing") \ 2201 \ 2202 /* flags for performance data collection */ \ 2203 \ 2204 product(bool, UsePerfData, true, \ 2205 "Flag to disable jvmstat instrumentation for performance testing "\ 2206 "and problem isolation purposes") \ 2207 \ 2208 product(bool, PerfDataSaveToFile, false, \ 2209 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2210 \ 2211 product(ccstr, PerfDataSaveFile, NULL, \ 2212 "Save PerfData memory to the specified absolute pathname. " \ 2213 "The string %p in the file name (if present) " \ 2214 "will be replaced by pid") \ 2215 \ 2216 product(intx, PerfDataSamplingInterval, 50, \ 2217 "Data sampling interval (in milliseconds)") \ 2218 range(PeriodicTask::min_interval, max_jint) \ 2219 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2220 \ 2221 product(bool, PerfDisableSharedMem, false, \ 2222 "Store performance data in standard memory") \ 2223 \ 2224 product(intx, PerfDataMemorySize, 32*K, \ 2225 "Size of performance data memory region. Will be rounded " \ 2226 "up to a multiple of the native os page size.") \ 2227 range(128, 32*64*K) \ 2228 \ 2229 product(intx, PerfMaxStringConstLength, 1024, \ 2230 "Maximum PerfStringConstant string length before truncation") \ 2231 range(32, 32*K) \ 2232 \ 2233 product(bool, PerfAllowAtExitRegistration, false, \ 2234 "Allow registration of atexit() methods") \ 2235 \ 2236 product(bool, PerfBypassFileSystemCheck, false, \ 2237 "Bypass Win32 file system criteria checks (Windows Only)") \ 2238 \ 2239 product(intx, UnguardOnExecutionViolation, 0, \ 2240 "Unguard page and retry on no-execute fault (Win32 only) " \ 2241 "0=off, 1=conservative, 2=aggressive") \ 2242 range(0, 2) \ 2243 \ 2244 /* Serviceability Support */ \ 2245 \ 2246 product(bool, ManagementServer, false, \ 2247 "Create JMX Management Server") \ 2248 \ 2249 product(bool, DisableAttachMechanism, false, \ 2250 "Disable mechanism that allows tools to attach to this VM") \ 2251 \ 2252 product(bool, StartAttachListener, false, \ 2253 "Always start Attach Listener at VM startup") \ 2254 \ 2255 product(bool, EnableDynamicAgentLoading, true, \ 2256 "Allow tools to load agents with the attach mechanism") \ 2257 \ 2258 manageable(bool, PrintConcurrentLocks, false, \ 2259 "Print java.util.concurrent locks in thread dump") \ 2260 \ 2261 /* Shared spaces */ \ 2262 \ 2263 product(bool, UseSharedSpaces, true, \ 2264 "Use shared spaces for metadata") \ 2265 \ 2266 product(bool, VerifySharedSpaces, false, \ 2267 "Verify integrity of shared spaces") \ 2268 \ 2269 product(bool, RequireSharedSpaces, false, \ 2270 "Require shared spaces for metadata") \ 2271 \ 2272 product(bool, DumpSharedSpaces, false, \ 2273 "Special mode: JVM reads a class list, loads classes, builds " \ 2274 "shared spaces, and dumps the shared spaces to a file to be " \ 2275 "used in future JVM runs") \ 2276 \ 2277 product(bool, DynamicDumpSharedSpaces, false, \ 2278 "Dynamic archive") \ 2279 \ 2280 product(bool, PrintSharedArchiveAndExit, false, \ 2281 "Print shared archive file contents") \ 2282 \ 2283 product(bool, PrintSharedDictionary, false, \ 2284 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2285 "dictionary") \ 2286 \ 2287 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2288 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2289 "Address to allocate shared memory region for class data") \ 2290 range(0, SIZE_MAX) \ 2291 \ 2292 product(ccstr, SharedArchiveConfigFile, NULL, \ 2293 "Data to add to the CDS archive file") \ 2294 \ 2295 product(uintx, SharedSymbolTableBucketSize, 4, \ 2296 "Average number of symbols per bucket in shared table") \ 2297 range(2, 246) \ 2298 \ 2299 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2300 "Allow Java agent to be run with CDS dumping") \ 2301 \ 2302 diagnostic(bool, PrintMethodHandleStubs, false, \ 2303 "Print generated stub code for method handles") \ 2304 \ 2305 develop(bool, TraceMethodHandles, false, \ 2306 "trace internal method handle operations") \ 2307 \ 2308 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2309 "perform extra checks when constructing method handles") \ 2310 \ 2311 diagnostic(bool, ShowHiddenFrames, false, \ 2312 "show method handle implementation frames (usually hidden)") \ 2313 \ 2314 experimental(bool, TrustFinalNonStaticFields, false, \ 2315 "trust final non-static declarations for constant folding") \ 2316 \ 2317 diagnostic(bool, FoldStableValues, true, \ 2318 "Optimize loads from stable fields (marked w/ @Stable)") \ 2319 \ 2320 develop(bool, TraceInvokeDynamic, false, \ 2321 "trace internal invoke dynamic operations") \ 2322 \ 2323 diagnostic(int, UseBootstrapCallInfo, 1, \ 2324 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2325 "resolved before the bootstrap method is called; 1: when a BSM " \ 2326 "that may accept a BootstrapCallInfo is detected, use that API " \ 2327 "to pass BSM arguments, which allows the BSM to delay their " \ 2328 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2329 "via that API, instead of with the eagerly-resolved array.") \ 2330 \ 2331 diagnostic(bool, PauseAtStartup, false, \ 2332 "Causes the VM to pause at startup time and wait for the pause " \ 2333 "file to be removed (default: ./vm.paused.<pid>)") \ 2334 \ 2335 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2336 "The file to create and for whose removal to await when pausing " \ 2337 "at startup. (default: ./vm.paused.<pid>)") \ 2338 \ 2339 diagnostic(bool, PauseAtExit, false, \ 2340 "Pause and wait for keypress on exit if a debugger is attached") \ 2341 \ 2342 product(bool, ExtendedDTraceProbes, false, \ 2343 "Enable performance-impacting dtrace probes") \ 2344 \ 2345 product(bool, DTraceMethodProbes, false, \ 2346 "Enable dtrace probes for method-entry and method-exit") \ 2347 \ 2348 product(bool, DTraceAllocProbes, false, \ 2349 "Enable dtrace probes for object allocation") \ 2350 \ 2351 product(bool, DTraceMonitorProbes, false, \ 2352 "Enable dtrace probes for monitor events") \ 2353 \ 2354 product(bool, RelaxAccessControlCheck, false, \ 2355 "Relax the access control checks in the verifier") \ 2356 \ 2357 product(uintx, StringTableSize, defaultStringTableSize, \ 2358 "Number of buckets in the interned String table " \ 2359 "(will be rounded to nearest higher power of 2)") \ 2360 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 2361 \ 2362 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2363 "Number of buckets in the JVM internal Symbol table") \ 2364 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 2365 \ 2366 product(bool, UseStringDeduplication, false, \ 2367 "Use string deduplication") \ 2368 \ 2369 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2370 "A string must reach this age (or be promoted to an old region) " \ 2371 "to be considered for deduplication") \ 2372 range(1, markWord::max_age) \ 2373 \ 2374 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2375 "Force table resize every time the table is scanned") \ 2376 \ 2377 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2378 "Force table rehash every time the table is scanned") \ 2379 \ 2380 diagnostic(bool, WhiteBoxAPI, false, \ 2381 "Enable internal testing APIs") \ 2382 \ 2383 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2384 "Default survivor space alignment in bytes") \ 2385 range(8, 256) \ 2386 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2387 \ 2388 product(ccstr, DumpLoadedClassList, NULL, \ 2389 "Dump the names all loaded classes, that could be stored into " \ 2390 "the CDS archive, in the specified file") \ 2391 \ 2392 product(ccstr, SharedClassListFile, NULL, \ 2393 "Override the default CDS class list") \ 2394 \ 2395 product(ccstr, SharedArchiveFile, NULL, \ 2396 "Override the default location of the CDS archive file") \ 2397 \ 2398 product(ccstr, ArchiveClassesAtExit, NULL, \ 2399 "The path and name of the dynamic archive file") \ 2400 \ 2401 product(ccstr, ExtraSharedClassListFile, NULL, \ 2402 "Extra classlist for building the CDS archive file") \ 2403 \ 2404 diagnostic(intx, ArchiveRelocationMode, 0, \ 2405 "(0) first map at preferred address, and if " \ 2406 "unsuccessful, map at alternative address (default); " \ 2407 "(1) always map at alternative address; " \ 2408 "(2) always map at preferred address, and if unsuccessful, " \ 2409 "do not map the archive") \ 2410 range(0, 2) \ 2411 \ 2412 experimental(size_t, ArrayAllocatorMallocLimit, \ 2413 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2414 "Allocation less than this value will be allocated " \ 2415 "using malloc. Larger allocations will use mmap.") \ 2416 \ 2417 experimental(bool, AlwaysAtomicAccesses, false, \ 2418 "Accesses to all variables should always be atomic") \ 2419 \ 2420 diagnostic(bool, UseUnalignedAccesses, false, \ 2421 "Use unaligned memory accesses in Unsafe") \ 2422 \ 2423 product_pd(bool, PreserveFramePointer, \ 2424 "Use the FP register for holding the frame pointer " \ 2425 "and not as a general purpose register.") \ 2426 \ 2427 diagnostic(bool, CheckIntrinsics, true, \ 2428 "When a class C is loaded, check that " \ 2429 "(1) all intrinsics defined by the VM for class C are present "\ 2430 "in the loaded class file and are marked with the " \ 2431 "@HotSpotIntrinsicCandidate annotation, that " \ 2432 "(2) there is an intrinsic registered for all loaded methods " \ 2433 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2434 "annotation, and that " \ 2435 "(3) no orphan methods exist for class C (i.e., methods for " \ 2436 "which the VM declares an intrinsic but that are not declared "\ 2437 "in the loaded class C. " \ 2438 "Check (3) is available only in debug builds.") \ 2439 \ 2440 diagnostic_pd(intx, InitArrayShortSize, \ 2441 "Threshold small size (in bytes) for clearing arrays. " \ 2442 "Anything this size or smaller may get converted to discrete " \ 2443 "scalar stores.") \ 2444 range(0, max_intx) \ 2445 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2446 \ 2447 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2448 "Disable backwards compatibility for compile commands.") \ 2449 \ 2450 diagnostic(bool, CompilerDirectivesPrint, false, \ 2451 "Print compiler directives on installation.") \ 2452 diagnostic(int, CompilerDirectivesLimit, 50, \ 2453 "Limit on number of compiler directives.") \ 2454 \ 2455 product(ccstr, AllocateHeapAt, NULL, \ 2456 "Path to the directoy where a temporary file will be created " \ 2457 "to use as the backing store for Java Heap.") \ 2458 \ 2459 experimental(ccstr, AllocateOldGenAt, NULL, \ 2460 "Path to the directoy where a temporary file will be " \ 2461 "created to use as the backing store for old generation." \ 2462 "File of size Xmx is pre-allocated for performance reason, so" \ 2463 "we need that much space available") \ 2464 \ 2465 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2466 "Run periodic metaspace verifications (0 - none, " \ 2467 "1 - always, >1 every nth interval)") \ 2468 \ 2469 diagnostic(bool, ShowRegistersOnAssert, true, \ 2470 "On internal errors, include registers in error report.") \ 2471 \ 2472 diagnostic(bool, UseSwitchProfiling, true, \ 2473 "leverage profiling for table/lookup switch") \ 2474 \ 2475 develop(bool, TraceMemoryWriteback, false, \ 2476 "Trace memory writeback operations") \ 2477 \ 2478 JFR_ONLY(product(bool, FlightRecorder, false, \ 2479 "(Deprecated) Enable Flight Recorder")) \ 2480 \ 2481 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2482 "Flight Recorder options")) \ 2483 \ 2484 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2485 "Start flight recording with options")) \ 2486 \ 2487 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2488 "Use platform unstable time where supported for timestamps only") \ 2489 \ 2490 product(bool, UseNewFieldLayout, true, \ 2491 "(Deprecated) Use new algorithm to compute field layouts") \ 2492 \ 2493 product(bool, UseEmptySlotsInSupers, true, \ 2494 "Allow allocating fields in empty slots of super-classes") \ 2495 \ 2496 product(intx, LogAsyncInterval, 200, \ 2497 "Milliseconds between asynchronous log flushing") \ 2498 \ 2499 2500 2501 2502 // Interface macros 2503 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2504 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2505 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2506 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2507 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2508 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2509 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2510 #ifdef PRODUCT 2511 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2512 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2513 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2514 #else 2515 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2516 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2517 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2518 #endif // PRODUCT 2519 // Special LP64 flags, product only needed for now. 2520 #ifdef _LP64 2521 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2522 #else 2523 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2524 #endif // _LP64 2525 2526 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2527 DECLARE_PD_DEVELOPER_FLAG, \ 2528 DECLARE_PRODUCT_FLAG, \ 2529 DECLARE_PD_PRODUCT_FLAG, \ 2530 DECLARE_DIAGNOSTIC_FLAG, \ 2531 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2532 DECLARE_EXPERIMENTAL_FLAG, \ 2533 DECLARE_NOTPRODUCT_FLAG, \ 2534 DECLARE_MANAGEABLE_FLAG, \ 2535 DECLARE_PRODUCT_RW_FLAG, \ 2536 DECLARE_LP64_PRODUCT_FLAG, \ 2537 IGNORE_RANGE, \ 2538 IGNORE_CONSTRAINT) 2539 2540 #endif // SHARE_RUNTIME_GLOBALS_HPP