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 notproduct(bool, PrintValueLayout, false, \ 773 "Print field layout for each value type") \ 774 \ 775 notproduct(bool, PrintValueArrayLayout, false, \ 776 "Print array layout for each value type array") \ 777 \ 778 product(intx, ValueArrayElemMaxFlatSize, -1, \ 779 "Max size for flattening value array elements, <0 no limit") \ 780 \ 781 product(intx, ValueFieldMaxFlatSize, 128, \ 782 "Max size for flattening value type fields, <0 no limit") \ 783 \ 784 product(intx, ValueArrayElemMaxFlatOops, 4, \ 785 "Max nof embedded object references in a value type to flatten, <0 no limit") \ 786 \ 787 product(bool, ValueArrayAtomicAccess, false, \ 788 "Atomic value array accesses by-default, for all value arrays") \ 789 \ 790 /* Need to limit the extent of the padding to reasonable size. */\ 791 /* 8K is well beyond the reasonable HW cache line size, even with */\ 792 /* aggressive prefetching, while still leaving the room for segregating */\ 793 /* among the distinct pages. */\ 794 product(intx, ContendedPaddingWidth, 128, \ 795 "How many bytes to pad the fields/classes marked @Contended with")\ 796 range(0, 8192) \ 797 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 798 \ 799 product(bool, EnableContended, true, \ 800 "Enable @Contended annotation support") \ 801 \ 802 product(bool, RestrictContended, true, \ 803 "Restrict @Contended to trusted classes") \ 804 \ 805 product(bool, UseBiasedLocking, true, \ 806 "Enable biased locking in JVM") \ 807 \ 808 product(intx, BiasedLockingStartupDelay, 0, \ 809 "Number of milliseconds to wait before enabling biased locking") \ 810 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 811 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 812 \ 813 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 814 "Print statistics of biased locking in JVM") \ 815 \ 816 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 817 "Threshold of number of revocations per type to try to " \ 818 "rebias all objects in the heap of that type") \ 819 range(0, max_intx) \ 820 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 821 \ 822 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 823 "Threshold of number of revocations per type to permanently " \ 824 "revoke biases of all objects in the heap of that type") \ 825 range(0, max_intx) \ 826 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 827 \ 828 product(intx, BiasedLockingDecayTime, 25000, \ 829 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 830 "type after previous bulk rebias") \ 831 range(500, max_intx) \ 832 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 833 \ 834 product(bool, ExitOnOutOfMemoryError, false, \ 835 "JVM exits on the first occurrence of an out-of-memory error") \ 836 \ 837 product(bool, CrashOnOutOfMemoryError, false, \ 838 "JVM aborts, producing an error log and core/mini dump, on the " \ 839 "first occurrence of an out-of-memory error") \ 840 \ 841 /* tracing */ \ 842 \ 843 develop(bool, StressRewriter, false, \ 844 "Stress linktime bytecode rewriting") \ 845 \ 846 product(ccstr, TraceJVMTI, NULL, \ 847 "Trace flags for JVMTI functions and events") \ 848 \ 849 /* This option can change an EMCP method into an obsolete method. */ \ 850 /* This can affect tests that except specific methods to be EMCP. */ \ 851 /* This option should be used with caution. */ \ 852 product(bool, StressLdcRewrite, false, \ 853 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 854 \ 855 /* change to false by default sometime after Mustang */ \ 856 product(bool, VerifyMergedCPBytecodes, true, \ 857 "Verify bytecodes after RedefineClasses constant pool merging") \ 858 \ 859 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 860 "(Deprecated) Allow redefinition to add and delete private " \ 861 "static or final methods for compatibility with old releases") \ 862 \ 863 develop(bool, TraceBytecodes, false, \ 864 "Trace bytecode execution") \ 865 \ 866 develop(bool, TraceICs, false, \ 867 "Trace inline cache changes") \ 868 \ 869 notproduct(bool, TraceInvocationCounterOverflow, false, \ 870 "Trace method invocation counter overflow") \ 871 \ 872 develop(bool, TraceInlineCacheClearing, false, \ 873 "Trace clearing of inline caches in nmethods") \ 874 \ 875 develop(bool, TraceDependencies, false, \ 876 "Trace dependencies") \ 877 \ 878 develop(bool, VerifyDependencies, trueInDebug, \ 879 "Exercise and verify the compilation dependency mechanism") \ 880 \ 881 develop(bool, TraceNewOopMapGeneration, false, \ 882 "Trace OopMapGeneration") \ 883 \ 884 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 885 "Trace OopMapGeneration: print detailed cell states") \ 886 \ 887 develop(bool, TimeOopMap, false, \ 888 "Time calls to GenerateOopMap::compute_map() in sum") \ 889 \ 890 develop(bool, TimeOopMap2, false, \ 891 "Time calls to GenerateOopMap::compute_map() individually") \ 892 \ 893 develop(bool, TraceOopMapRewrites, false, \ 894 "Trace rewriting of method oops during oop map generation") \ 895 \ 896 develop(bool, TraceICBuffer, false, \ 897 "Trace usage of IC buffer") \ 898 \ 899 develop(bool, TraceCompiledIC, false, \ 900 "Trace changes of compiled IC") \ 901 \ 902 develop(bool, FLSVerifyDictionary, false, \ 903 "Do lots of (expensive) FLS dictionary verification") \ 904 \ 905 \ 906 notproduct(bool, CheckMemoryInitialization, false, \ 907 "Check memory initialization") \ 908 \ 909 product(uintx, ProcessDistributionStride, 4, \ 910 "Stride through processors when distributing processes") \ 911 range(0, max_juint) \ 912 \ 913 develop(bool, TraceFinalizerRegistration, false, \ 914 "Trace registration of final references") \ 915 \ 916 product(bool, IgnoreEmptyClassPaths, false, \ 917 "Ignore empty path elements in -classpath") \ 918 \ 919 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 920 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 921 "Initial size of the boot class loader data metaspace") \ 922 range(30*K, max_uintx/BytesPerWord) \ 923 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 924 \ 925 product(bool, PrintHeapAtSIGBREAK, true, \ 926 "Print heap layout in response to SIGBREAK") \ 927 \ 928 manageable(bool, PrintClassHistogram, false, \ 929 "Print a histogram of class instances") \ 930 \ 931 experimental(double, ObjectCountCutOffPercent, 0.5, \ 932 "The percentage of the used heap that the instances of a class " \ 933 "must occupy for the class to generate a trace event") \ 934 range(0.0, 100.0) \ 935 \ 936 /* JVMTI heap profiling */ \ 937 \ 938 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 939 "Trace JVMTI object tagging calls") \ 940 \ 941 diagnostic(bool, VerifyBeforeIteration, false, \ 942 "Verify memory system before JVMTI iteration") \ 943 \ 944 /* compiler interface */ \ 945 \ 946 develop(bool, CIPrintCompilerName, false, \ 947 "when CIPrint is active, print the name of the active compiler") \ 948 \ 949 diagnostic(bool, CIPrintCompileQueue, false, \ 950 "display the contents of the compile queue whenever a " \ 951 "compilation is enqueued") \ 952 \ 953 develop(bool, CIPrintRequests, false, \ 954 "display every request for compilation") \ 955 \ 956 product(bool, CITime, false, \ 957 "collect timing information for compilation") \ 958 \ 959 develop(bool, CITimeVerbose, false, \ 960 "be more verbose in compilation timings") \ 961 \ 962 develop(bool, CITimeEach, false, \ 963 "display timing information after each successful compilation") \ 964 \ 965 develop(bool, CICountOSR, false, \ 966 "use a separate counter when assigning ids to osr compilations") \ 967 \ 968 develop(bool, CICompileNatives, true, \ 969 "compile native methods if supported by the compiler") \ 970 \ 971 develop_pd(bool, CICompileOSR, \ 972 "compile on stack replacement methods if supported by the " \ 973 "compiler") \ 974 \ 975 develop(bool, CIPrintMethodCodes, false, \ 976 "print method bytecodes of the compiled code") \ 977 \ 978 develop(bool, CIPrintTypeFlow, false, \ 979 "print the results of ciTypeFlow analysis") \ 980 \ 981 develop(bool, CITraceTypeFlow, false, \ 982 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 983 \ 984 develop(intx, OSROnlyBCI, -1, \ 985 "OSR only at this bci. Negative values mean exclude that bci") \ 986 \ 987 /* compiler */ \ 988 \ 989 /* notice: the max range value here is max_jint, not max_intx */ \ 990 /* because of overflow issue */ \ 991 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 992 "Number of compiler threads to run") \ 993 range(0, max_jint) \ 994 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 995 \ 996 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 997 "Dynamically choose the number of parallel compiler threads") \ 998 \ 999 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 1000 "Reduce the number of parallel compiler threads when they " \ 1001 "are not used") \ 1002 \ 1003 diagnostic(bool, TraceCompilerThreads, false, \ 1004 "Trace creation and removal of compiler threads") \ 1005 \ 1006 develop(bool, InjectCompilerCreationFailure, false, \ 1007 "Inject thread creation failures for " \ 1008 "UseDynamicNumberOfCompilerThreads") \ 1009 \ 1010 develop(bool, UseStackBanging, true, \ 1011 "use stack banging for stack overflow checks (required for " \ 1012 "proper StackOverflow handling; disable only to measure cost " \ 1013 "of stackbanging)") \ 1014 \ 1015 develop(bool, GenerateSynchronizationCode, true, \ 1016 "generate locking/unlocking code for synchronized methods and " \ 1017 "monitors") \ 1018 \ 1019 develop(bool, GenerateRangeChecks, true, \ 1020 "Generate range checks for array accesses") \ 1021 \ 1022 diagnostic_pd(bool, ImplicitNullChecks, \ 1023 "Generate code for implicit null checks") \ 1024 \ 1025 product_pd(bool, TrapBasedNullChecks, \ 1026 "Generate code for null checks that uses a cmp and trap " \ 1027 "instruction raising SIGTRAP. This is only used if an access to" \ 1028 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1029 "ImplicitNullChecks don't work (PPC64).") \ 1030 \ 1031 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1032 "Enable Thread SMR extra validity checks") \ 1033 \ 1034 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1035 "Enable Thread SMR Statistics") \ 1036 \ 1037 product(bool, UseNotificationThread, true, \ 1038 "Use Notification Thread") \ 1039 \ 1040 product(bool, Inline, true, \ 1041 "Enable inlining") \ 1042 \ 1043 product(bool, ClipInlining, true, \ 1044 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1045 \ 1046 develop(bool, UseCHA, true, \ 1047 "Enable CHA") \ 1048 \ 1049 product(bool, UseTypeProfile, true, \ 1050 "Check interpreter profile for historically monomorphic calls") \ 1051 \ 1052 diagnostic(bool, PrintInlining, false, \ 1053 "Print inlining optimizations") \ 1054 \ 1055 product(bool, UsePopCountInstruction, false, \ 1056 "Use population count instruction") \ 1057 \ 1058 develop(bool, EagerInitialization, false, \ 1059 "Eagerly initialize classes if possible") \ 1060 \ 1061 diagnostic(bool, LogTouchedMethods, false, \ 1062 "Log methods which have been ever touched in runtime") \ 1063 \ 1064 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1065 "Print all methods that have been ever touched in runtime") \ 1066 \ 1067 develop(bool, TraceMethodReplacement, false, \ 1068 "Print when methods are replaced do to recompilation") \ 1069 \ 1070 develop(bool, PrintMethodFlushing, false, \ 1071 "Print the nmethods being flushed") \ 1072 \ 1073 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1074 "print statistics about method flushing") \ 1075 \ 1076 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1077 "Number of compiled code invocations after which " \ 1078 "the method is considered as hot by the flusher") \ 1079 range(1, max_jint) \ 1080 \ 1081 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1082 "Minimum number of sweeper passes before an nmethod " \ 1083 "can be flushed") \ 1084 range(0, max_intx) \ 1085 \ 1086 product(bool, UseCodeAging, true, \ 1087 "Insert counter to detect warm methods") \ 1088 \ 1089 diagnostic(bool, StressCodeAging, false, \ 1090 "Start with counters compiled in") \ 1091 \ 1092 develop(bool, StressCodeBuffers, false, \ 1093 "Exercise code buffer expansion and other rare state changes") \ 1094 \ 1095 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1096 "Generate extra debugging information for non-safepoints in " \ 1097 "nmethods") \ 1098 \ 1099 product(bool, PrintVMOptions, false, \ 1100 "Print flags that appeared on the command line") \ 1101 \ 1102 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1103 "Ignore unrecognized VM options") \ 1104 \ 1105 product(bool, PrintCommandLineFlags, false, \ 1106 "Print flags specified on command line or set by ergonomics") \ 1107 \ 1108 product(bool, PrintFlagsInitial, false, \ 1109 "Print all VM flags before argument processing and exit VM") \ 1110 \ 1111 product(bool, PrintFlagsFinal, false, \ 1112 "Print all VM flags after argument and ergonomic processing") \ 1113 \ 1114 notproduct(bool, PrintFlagsWithComments, false, \ 1115 "Print all VM flags with default values and descriptions and " \ 1116 "exit") \ 1117 \ 1118 product(bool, PrintFlagsRanges, false, \ 1119 "Print VM flags and their ranges") \ 1120 \ 1121 diagnostic(bool, SerializeVMOutput, true, \ 1122 "Use a mutex to serialize output to tty and LogFile") \ 1123 \ 1124 diagnostic(bool, DisplayVMOutput, true, \ 1125 "Display all VM output on the tty, independently of LogVMOutput") \ 1126 \ 1127 diagnostic(bool, LogVMOutput, false, \ 1128 "Save VM output to LogFile") \ 1129 \ 1130 diagnostic(ccstr, LogFile, NULL, \ 1131 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1132 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1133 \ 1134 product(ccstr, ErrorFile, NULL, \ 1135 "If an error occurs, save the error data to this file " \ 1136 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1137 \ 1138 product(bool, ExtensiveErrorReports, \ 1139 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1140 "Error reports are more extensive.") \ 1141 \ 1142 product(bool, DisplayVMOutputToStderr, false, \ 1143 "If DisplayVMOutput is true, display all VM output to stderr") \ 1144 \ 1145 product(bool, DisplayVMOutputToStdout, false, \ 1146 "If DisplayVMOutput is true, display all VM output to stdout") \ 1147 \ 1148 product(bool, ErrorFileToStderr, false, \ 1149 "If true, error data is printed to stderr instead of a file") \ 1150 \ 1151 product(bool, ErrorFileToStdout, false, \ 1152 "If true, error data is printed to stdout instead of a file") \ 1153 \ 1154 product(bool, UseHeavyMonitors, false, \ 1155 "use heavyweight instead of lightweight Java monitors") \ 1156 \ 1157 product(bool, PrintStringTableStatistics, false, \ 1158 "print statistics about the StringTable and SymbolTable") \ 1159 \ 1160 diagnostic(bool, VerifyStringTableAtExit, false, \ 1161 "verify StringTable contents at exit") \ 1162 \ 1163 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1164 "print histogram of the symbol table") \ 1165 \ 1166 notproduct(bool, ExitVMOnVerifyError, false, \ 1167 "standard exit from VM if bytecode verify error " \ 1168 "(only in debug mode)") \ 1169 \ 1170 diagnostic(ccstr, AbortVMOnException, NULL, \ 1171 "Call fatal if this exception is thrown. Example: " \ 1172 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1173 \ 1174 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1175 "Call fatal if the exception pointed by AbortVMOnException " \ 1176 "has this message") \ 1177 \ 1178 develop(bool, DebugVtables, false, \ 1179 "add debugging code to vtable dispatch") \ 1180 \ 1181 notproduct(bool, PrintVtableStats, false, \ 1182 "print vtables stats at end of run") \ 1183 \ 1184 develop(bool, TraceCreateZombies, false, \ 1185 "trace creation of zombie nmethods") \ 1186 \ 1187 product(bool, RangeCheckElimination, true, \ 1188 "Eliminate range checks") \ 1189 \ 1190 develop_pd(bool, UncommonNullCast, \ 1191 "track occurrences of null in casts; adjust compiler tactics") \ 1192 \ 1193 develop(bool, TypeProfileCasts, true, \ 1194 "treat casts like calls for purposes of type profiling") \ 1195 \ 1196 develop(bool, TraceLivenessGen, false, \ 1197 "Trace the generation of liveness analysis information") \ 1198 \ 1199 notproduct(bool, TraceLivenessQuery, false, \ 1200 "Trace queries of liveness analysis information") \ 1201 \ 1202 notproduct(bool, CollectIndexSetStatistics, false, \ 1203 "Collect information about IndexSets") \ 1204 \ 1205 develop(bool, UseLoopSafepoints, true, \ 1206 "Generate Safepoint nodes in every loop") \ 1207 \ 1208 develop(intx, FastAllocateSizeLimit, 128*K, \ 1209 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1210 "Inline allocations larger than this in doublewords must go slow")\ 1211 \ 1212 product_pd(bool, CompactStrings, \ 1213 "Enable Strings to use single byte chars in backing store") \ 1214 \ 1215 product_pd(uintx, TypeProfileLevel, \ 1216 "=XYZ, with Z: Type profiling of arguments at call; " \ 1217 "Y: Type profiling of return value at call; " \ 1218 "X: Type profiling of parameters to methods; " \ 1219 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1220 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1221 \ 1222 product(intx, TypeProfileArgsLimit, 2, \ 1223 "max number of call arguments to consider for type profiling") \ 1224 range(0, 16) \ 1225 \ 1226 product(intx, TypeProfileParmsLimit, 2, \ 1227 "max number of incoming parameters to consider for type profiling"\ 1228 ", -1 for all") \ 1229 range(-1, 64) \ 1230 \ 1231 /* statistics */ \ 1232 develop(bool, CountCompiledCalls, false, \ 1233 "Count method invocations") \ 1234 \ 1235 notproduct(bool, CountRuntimeCalls, false, \ 1236 "Count VM runtime calls") \ 1237 \ 1238 develop(bool, CountJNICalls, false, \ 1239 "Count jni method invocations") \ 1240 \ 1241 notproduct(bool, CountJVMCalls, false, \ 1242 "Count jvm method invocations") \ 1243 \ 1244 notproduct(bool, CountRemovableExceptions, false, \ 1245 "Count exceptions that could be replaced by branches due to " \ 1246 "inlining") \ 1247 \ 1248 notproduct(bool, ICMissHistogram, false, \ 1249 "Produce histogram of IC misses") \ 1250 \ 1251 /* interpreter */ \ 1252 product_pd(bool, RewriteBytecodes, \ 1253 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1254 \ 1255 product_pd(bool, RewriteFrequentPairs, \ 1256 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1257 \ 1258 diagnostic(bool, PrintInterpreter, false, \ 1259 "Print the generated interpreter code") \ 1260 \ 1261 product(bool, UseInterpreter, true, \ 1262 "Use interpreter for non-compiled methods") \ 1263 \ 1264 develop(bool, UseFastSignatureHandlers, true, \ 1265 "Use fast signature handlers for native calls") \ 1266 \ 1267 product(bool, UseLoopCounter, true, \ 1268 "Increment invocation counter on backward branch") \ 1269 \ 1270 product_pd(bool, UseOnStackReplacement, \ 1271 "Use on stack replacement, calls runtime if invoc. counter " \ 1272 "overflows in loop") \ 1273 \ 1274 notproduct(bool, TraceOnStackReplacement, false, \ 1275 "Trace on stack replacement") \ 1276 \ 1277 product_pd(bool, PreferInterpreterNativeStubs, \ 1278 "Use always interpreter stubs for native methods invoked via " \ 1279 "interpreter") \ 1280 \ 1281 develop(bool, CountBytecodes, false, \ 1282 "Count number of bytecodes executed") \ 1283 \ 1284 develop(bool, PrintBytecodeHistogram, false, \ 1285 "Print histogram of the executed bytecodes") \ 1286 \ 1287 develop(bool, PrintBytecodePairHistogram, false, \ 1288 "Print histogram of the executed bytecode pairs") \ 1289 \ 1290 diagnostic(bool, PrintSignatureHandlers, false, \ 1291 "Print code generated for native method signature handlers") \ 1292 \ 1293 develop(bool, VerifyOops, false, \ 1294 "Do plausibility checks for oops") \ 1295 \ 1296 develop(bool, CheckUnhandledOops, false, \ 1297 "Check for unhandled oops in VM code") \ 1298 \ 1299 develop(bool, VerifyJNIFields, trueInDebug, \ 1300 "Verify jfieldIDs for instance fields") \ 1301 \ 1302 notproduct(bool, VerifyJNIEnvThread, false, \ 1303 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1304 "from JNI") \ 1305 \ 1306 develop(bool, VerifyFPU, false, \ 1307 "Verify FPU state (check for NaN's, etc.)") \ 1308 \ 1309 develop(bool, VerifyThread, false, \ 1310 "Watch the thread register for corruption (SPARC only)") \ 1311 \ 1312 develop(bool, VerifyActivationFrameSize, false, \ 1313 "Verify that activation frame didn't become smaller than its " \ 1314 "minimal size") \ 1315 \ 1316 develop(bool, TraceFrequencyInlining, false, \ 1317 "Trace frequency based inlining") \ 1318 \ 1319 develop_pd(bool, InlineIntrinsics, \ 1320 "Inline intrinsics that can be statically resolved") \ 1321 \ 1322 product_pd(bool, ProfileInterpreter, \ 1323 "Profile at the bytecode level during interpretation") \ 1324 \ 1325 develop(bool, TraceProfileInterpreter, false, \ 1326 "Trace profiling at the bytecode level during interpretation. " \ 1327 "This outputs the profiling information collected to improve " \ 1328 "jit compilation.") \ 1329 \ 1330 develop_pd(bool, ProfileTraps, \ 1331 "Profile deoptimization traps at the bytecode level") \ 1332 \ 1333 product(intx, ProfileMaturityPercentage, 20, \ 1334 "number of method invocations/branches (expressed as % of " \ 1335 "CompileThreshold) before using the method's profile") \ 1336 range(0, 100) \ 1337 \ 1338 diagnostic(bool, PrintMethodData, false, \ 1339 "Print the results of +ProfileInterpreter at end of run") \ 1340 \ 1341 develop(bool, VerifyDataPointer, trueInDebug, \ 1342 "Verify the method data pointer during interpreter profiling") \ 1343 \ 1344 develop(bool, VerifyCompiledCode, false, \ 1345 "Include miscellaneous runtime verifications in nmethod code; " \ 1346 "default off because it disturbs nmethod size heuristics") \ 1347 \ 1348 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1349 "Manually make GC thread crash then dump java stack trace; " \ 1350 "Test only") \ 1351 \ 1352 /* compilation */ \ 1353 product(bool, UseCompiler, true, \ 1354 "Use Just-In-Time compilation") \ 1355 \ 1356 product(bool, UseCounterDecay, true, \ 1357 "Adjust recompilation counters") \ 1358 \ 1359 develop(intx, CounterHalfLifeTime, 30, \ 1360 "Half-life time of invocation counters (in seconds)") \ 1361 \ 1362 develop(intx, CounterDecayMinIntervalLength, 500, \ 1363 "The minimum interval (in milliseconds) between invocation of " \ 1364 "CounterDecay") \ 1365 \ 1366 product(bool, AlwaysCompileLoopMethods, false, \ 1367 "When using recompilation, never interpret methods " \ 1368 "containing loops") \ 1369 \ 1370 product(bool, DontCompileHugeMethods, true, \ 1371 "Do not compile methods > HugeMethodLimit") \ 1372 \ 1373 /* Bytecode escape analysis estimation. */ \ 1374 product(bool, EstimateArgEscape, true, \ 1375 "Analyze bytecodes to estimate escape state of arguments") \ 1376 \ 1377 product(intx, BCEATraceLevel, 0, \ 1378 "How much tracing to do of bytecode escape analysis estimates " \ 1379 "(0-3)") \ 1380 range(0, 3) \ 1381 \ 1382 product(intx, MaxBCEAEstimateLevel, 5, \ 1383 "Maximum number of nested calls that are analyzed by BC EA") \ 1384 range(0, max_jint) \ 1385 \ 1386 product(intx, MaxBCEAEstimateSize, 150, \ 1387 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1388 range(0, max_jint) \ 1389 \ 1390 product(intx, AllocatePrefetchStyle, 1, \ 1391 "0 = no prefetch, " \ 1392 "1 = generate prefetch instructions for each allocation, " \ 1393 "2 = use TLAB watermark to gate allocation prefetch, " \ 1394 "3 = generate one prefetch instruction per cache line") \ 1395 range(0, 3) \ 1396 \ 1397 product(intx, AllocatePrefetchDistance, -1, \ 1398 "Distance to prefetch ahead of allocation pointer. " \ 1399 "-1: use system-specific value (automatically determined") \ 1400 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\ 1401 \ 1402 product(intx, AllocatePrefetchLines, 3, \ 1403 "Number of lines to prefetch ahead of array allocation pointer") \ 1404 range(1, 64) \ 1405 \ 1406 product(intx, AllocateInstancePrefetchLines, 1, \ 1407 "Number of lines to prefetch ahead of instance allocation " \ 1408 "pointer") \ 1409 range(1, 64) \ 1410 \ 1411 product(intx, AllocatePrefetchStepSize, 16, \ 1412 "Step size in bytes of sequential prefetch instructions") \ 1413 range(1, 512) \ 1414 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1415 \ 1416 product(intx, AllocatePrefetchInstr, 0, \ 1417 "Select instruction to prefetch ahead of allocation pointer") \ 1418 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1419 \ 1420 /* deoptimization */ \ 1421 develop(bool, TraceDeoptimization, false, \ 1422 "Trace deoptimization") \ 1423 \ 1424 develop(bool, PrintDeoptimizationDetails, false, \ 1425 "Print more information about deoptimization") \ 1426 \ 1427 develop(bool, DebugDeoptimization, false, \ 1428 "Tracing various information while debugging deoptimization") \ 1429 \ 1430 product(intx, SelfDestructTimer, 0, \ 1431 "Will cause VM to terminate after a given time (in minutes) " \ 1432 "(0 means off)") \ 1433 range(0, max_intx) \ 1434 \ 1435 product(intx, MaxJavaStackTraceDepth, 1024, \ 1436 "The maximum number of lines in the stack trace for Java " \ 1437 "exceptions (0 means all)") \ 1438 range(0, max_jint/2) \ 1439 \ 1440 /* notice: the max range value here is max_jint, not max_intx */ \ 1441 /* because of overflow issue */ \ 1442 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1443 "Guarantee a safepoint (at least) every so many milliseconds " \ 1444 "(0 means none)") \ 1445 range(0, max_jint) \ 1446 \ 1447 product(intx, SafepointTimeoutDelay, 10000, \ 1448 "Delay in milliseconds for option SafepointTimeout") \ 1449 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1450 NOT_LP64(range(0, max_intx)) \ 1451 \ 1452 product(intx, NmethodSweepActivity, 10, \ 1453 "Removes cold nmethods from code cache if > 0. Higher values " \ 1454 "result in more aggressive sweeping") \ 1455 range(0, 2000) \ 1456 \ 1457 notproduct(bool, LogSweeper, false, \ 1458 "Keep a ring buffer of sweeper activity") \ 1459 \ 1460 notproduct(intx, SweeperLogEntries, 1024, \ 1461 "Number of records in the ring buffer of sweeper activity") \ 1462 \ 1463 notproduct(intx, MemProfilingInterval, 500, \ 1464 "Time between each invocation of the MemProfiler") \ 1465 \ 1466 develop(intx, MallocCatchPtr, -1, \ 1467 "Hit breakpoint when mallocing/freeing this pointer") \ 1468 \ 1469 notproduct(ccstrlist, SuppressErrorAt, "", \ 1470 "List of assertions (file:line) to muzzle") \ 1471 \ 1472 develop(intx, StackPrintLimit, 100, \ 1473 "number of stack frames to print in VM-level stack dump") \ 1474 \ 1475 notproduct(intx, MaxElementPrintSize, 256, \ 1476 "maximum number of elements to print") \ 1477 \ 1478 notproduct(intx, MaxSubklassPrintSize, 4, \ 1479 "maximum number of subklasses to print when printing klass") \ 1480 \ 1481 product(intx, MaxInlineLevel, 15, \ 1482 "maximum number of nested calls that are inlined") \ 1483 range(0, max_jint) \ 1484 \ 1485 product(intx, MaxRecursiveInlineLevel, 1, \ 1486 "maximum number of nested recursive calls that are inlined") \ 1487 range(0, max_jint) \ 1488 \ 1489 develop(intx, MaxForceInlineLevel, 100, \ 1490 "maximum number of nested calls that are forced for inlining " \ 1491 "(using CompileCommand or marked w/ @ForceInline)") \ 1492 range(0, max_jint) \ 1493 \ 1494 product_pd(intx, InlineSmallCode, \ 1495 "Only inline already compiled methods if their code size is " \ 1496 "less than this") \ 1497 range(0, max_jint) \ 1498 \ 1499 product(intx, MaxInlineSize, 35, \ 1500 "The maximum bytecode size of a method to be inlined") \ 1501 range(0, max_jint) \ 1502 \ 1503 product_pd(intx, FreqInlineSize, \ 1504 "The maximum bytecode size of a frequent method to be inlined") \ 1505 range(0, max_jint) \ 1506 \ 1507 product(intx, MaxTrivialSize, 6, \ 1508 "The maximum bytecode size of a trivial method to be inlined") \ 1509 range(0, max_jint) \ 1510 \ 1511 product(intx, MinInliningThreshold, 250, \ 1512 "The minimum invocation count a method needs to have to be " \ 1513 "inlined") \ 1514 range(0, max_jint) \ 1515 \ 1516 develop(intx, MethodHistogramCutoff, 100, \ 1517 "The cutoff value for method invocation histogram (+CountCalls)") \ 1518 \ 1519 develop(intx, DontYieldALotInterval, 10, \ 1520 "Interval between which yields will be dropped (milliseconds)") \ 1521 \ 1522 notproduct(intx, DeoptimizeALotInterval, 5, \ 1523 "Number of exits until DeoptimizeALot kicks in") \ 1524 \ 1525 notproduct(intx, ZombieALotInterval, 5, \ 1526 "Number of exits until ZombieALot kicks in") \ 1527 \ 1528 diagnostic(uintx, MallocMaxTestWords, 0, \ 1529 "If non-zero, maximum number of words that malloc/realloc can " \ 1530 "allocate (for testing only)") \ 1531 range(0, max_uintx) \ 1532 \ 1533 product(intx, TypeProfileWidth, 2, \ 1534 "Number of receiver types to record in call/cast profile") \ 1535 range(0, 8) \ 1536 \ 1537 develop(intx, BciProfileWidth, 2, \ 1538 "Number of return bci's to record in ret profile") \ 1539 \ 1540 product(intx, PerMethodRecompilationCutoff, 400, \ 1541 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1542 range(-1, max_intx) \ 1543 \ 1544 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1545 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1546 range(-1, max_intx) \ 1547 \ 1548 product(intx, PerMethodTrapLimit, 100, \ 1549 "Limit on traps (of one kind) in a method (includes inlines)") \ 1550 range(0, max_jint) \ 1551 \ 1552 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1553 "Limit on speculative traps (of one kind) in a method " \ 1554 "(includes inlines)") \ 1555 range(0, max_jint) \ 1556 \ 1557 product(intx, PerBytecodeTrapLimit, 4, \ 1558 "Limit on traps (of one kind) at a particular BCI") \ 1559 range(0, max_jint) \ 1560 \ 1561 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1562 "Extra method data trap entries for speculation") \ 1563 \ 1564 develop(intx, InlineFrequencyRatio, 20, \ 1565 "Ratio of call site execution to caller method invocation") \ 1566 range(0, max_jint) \ 1567 \ 1568 diagnostic_pd(intx, InlineFrequencyCount, \ 1569 "Count of call site execution necessary to trigger frequent " \ 1570 "inlining") \ 1571 range(0, max_jint) \ 1572 \ 1573 develop(intx, InlineThrowCount, 50, \ 1574 "Force inlining of interpreted methods that throw this often") \ 1575 range(0, max_jint) \ 1576 \ 1577 develop(intx, InlineThrowMaxSize, 200, \ 1578 "Force inlining of throwing methods smaller than this") \ 1579 range(0, max_jint) \ 1580 \ 1581 develop(intx, ProfilerNodeSize, 1024, \ 1582 "Size in K to allocate for the Profile Nodes of each thread") \ 1583 range(0, 1024) \ 1584 \ 1585 product_pd(size_t, MetaspaceSize, \ 1586 "Initial threshold (in bytes) at which a garbage collection " \ 1587 "is done to reduce Metaspace usage") \ 1588 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1589 \ 1590 product(size_t, MaxMetaspaceSize, max_uintx, \ 1591 "Maximum size of Metaspaces (in bytes)") \ 1592 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1593 \ 1594 product(size_t, CompressedClassSpaceSize, 1*G, \ 1595 "Maximum size of class area in Metaspace when compressed " \ 1596 "class pointers are used") \ 1597 range(1*M, 3*G) \ 1598 \ 1599 manageable(uintx, MinHeapFreeRatio, 40, \ 1600 "The minimum percentage of heap free after GC to avoid expansion."\ 1601 " For most GCs this applies to the old generation. In G1 and" \ 1602 " ParallelGC it applies to the whole heap.") \ 1603 range(0, 100) \ 1604 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1605 \ 1606 manageable(uintx, MaxHeapFreeRatio, 70, \ 1607 "The maximum percentage of heap free after GC to avoid shrinking."\ 1608 " For most GCs this applies to the old generation. In G1 and" \ 1609 " ParallelGC it applies to the whole heap.") \ 1610 range(0, 100) \ 1611 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1612 \ 1613 product(bool, ShrinkHeapInSteps, true, \ 1614 "When disabled, informs the GC to shrink the java heap directly" \ 1615 " to the target size at the next full GC rather than requiring" \ 1616 " smaller steps during multiple full GCs.") \ 1617 \ 1618 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1619 "Number of milliseconds per MB of free space in the heap") \ 1620 range(0, max_intx) \ 1621 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1622 \ 1623 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1624 "The minimum change in heap space due to GC (in bytes)") \ 1625 range(0, max_uintx) \ 1626 \ 1627 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1628 "The minimum expansion of Metaspace (in bytes)") \ 1629 range(0, max_uintx) \ 1630 \ 1631 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1632 "The maximum percentage of Metaspace free after GC to avoid " \ 1633 "shrinking") \ 1634 range(0, 100) \ 1635 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1636 \ 1637 product(uintx, MinMetaspaceFreeRatio, 40, \ 1638 "The minimum percentage of Metaspace free after GC to avoid " \ 1639 "expansion") \ 1640 range(0, 99) \ 1641 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1642 \ 1643 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1644 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1645 range(0, max_uintx) \ 1646 \ 1647 /* stack parameters */ \ 1648 product_pd(intx, StackYellowPages, \ 1649 "Number of yellow zone (recoverable overflows) pages of size " \ 1650 "4KB. If pages are bigger yellow zone is aligned up.") \ 1651 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1652 \ 1653 product_pd(intx, StackRedPages, \ 1654 "Number of red zone (unrecoverable overflows) pages of size " \ 1655 "4KB. If pages are bigger red zone is aligned up.") \ 1656 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1657 \ 1658 product_pd(intx, StackReservedPages, \ 1659 "Number of reserved zone (reserved to annotated methods) pages" \ 1660 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1661 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1662 \ 1663 product(bool, RestrictReservedStack, true, \ 1664 "Restrict @ReservedStackAccess to trusted classes") \ 1665 \ 1666 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1667 product_pd(intx, StackShadowPages, \ 1668 "Number of shadow zone (for overflow checking) pages of size " \ 1669 "4KB. If pages are bigger shadow zone is aligned up. " \ 1670 "This should exceed the depth of the VM and native call stack.") \ 1671 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1672 \ 1673 product_pd(intx, ThreadStackSize, \ 1674 "Thread Stack Size (in Kbytes)") \ 1675 range(0, 1 * M) \ 1676 \ 1677 product_pd(intx, VMThreadStackSize, \ 1678 "Non-Java Thread Stack Size (in Kbytes)") \ 1679 range(0, max_intx/(1 * K)) \ 1680 \ 1681 product_pd(intx, CompilerThreadStackSize, \ 1682 "Compiler Thread Stack Size (in Kbytes)") \ 1683 range(0, max_intx/(1 * K)) \ 1684 \ 1685 develop_pd(size_t, JVMInvokeMethodSlack, \ 1686 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1687 \ 1688 /* code cache parameters */ \ 1689 develop_pd(uintx, CodeCacheSegmentSize, \ 1690 "Code cache segment size (in bytes) - smallest unit of " \ 1691 "allocation") \ 1692 range(1, 1024) \ 1693 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1694 \ 1695 develop_pd(intx, CodeEntryAlignment, \ 1696 "Code entry alignment for generated code (in bytes)") \ 1697 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1698 \ 1699 product_pd(intx, OptoLoopAlignment, \ 1700 "Align inner loops to zero relative to this modulus") \ 1701 range(1, 16) \ 1702 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1703 \ 1704 product_pd(uintx, InitialCodeCacheSize, \ 1705 "Initial code cache size (in bytes)") \ 1706 range(os::vm_page_size(), max_uintx) \ 1707 \ 1708 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1709 "Minimum code cache size (in bytes) required to start VM.") \ 1710 range(0, max_uintx) \ 1711 \ 1712 product(bool, SegmentedCodeCache, false, \ 1713 "Use a segmented code cache") \ 1714 \ 1715 product_pd(uintx, ReservedCodeCacheSize, \ 1716 "Reserved code cache size (in bytes) - maximum code cache size") \ 1717 range(os::vm_page_size(), max_uintx) \ 1718 \ 1719 product_pd(uintx, NonProfiledCodeHeapSize, \ 1720 "Size of code heap with non-profiled methods (in bytes)") \ 1721 range(0, max_uintx) \ 1722 \ 1723 product_pd(uintx, ProfiledCodeHeapSize, \ 1724 "Size of code heap with profiled methods (in bytes)") \ 1725 range(0, max_uintx) \ 1726 \ 1727 product_pd(uintx, NonNMethodCodeHeapSize, \ 1728 "Size of code heap with non-nmethods (in bytes)") \ 1729 range(os::vm_page_size(), max_uintx) \ 1730 \ 1731 product_pd(uintx, CodeCacheExpansionSize, \ 1732 "Code cache expansion size (in bytes)") \ 1733 range(32*K, max_uintx) \ 1734 \ 1735 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1736 "Minimum number of segments in a code cache block") \ 1737 range(1, 100) \ 1738 \ 1739 notproduct(bool, ExitOnFullCodeCache, false, \ 1740 "Exit the VM if we fill the code cache") \ 1741 \ 1742 product(bool, UseCodeCacheFlushing, true, \ 1743 "Remove cold/old nmethods from the code cache") \ 1744 \ 1745 product(uintx, StartAggressiveSweepingAt, 10, \ 1746 "Start aggressive sweeping if X[%] of the code cache is free." \ 1747 "Segmented code cache: X[%] of the non-profiled heap." \ 1748 "Non-segmented code cache: X[%] of the total code cache") \ 1749 range(0, 100) \ 1750 \ 1751 /* AOT parameters */ \ 1752 experimental(bool, UseAOT, false, \ 1753 "Use AOT compiled files") \ 1754 \ 1755 experimental(ccstrlist, AOTLibrary, NULL, \ 1756 "AOT library") \ 1757 \ 1758 experimental(bool, PrintAOT, false, \ 1759 "Print used AOT klasses and methods") \ 1760 \ 1761 notproduct(bool, PrintAOTStatistics, false, \ 1762 "Print AOT statistics") \ 1763 \ 1764 diagnostic(bool, UseAOTStrictLoading, false, \ 1765 "Exit the VM if any of the AOT libraries has invalid config") \ 1766 \ 1767 product(bool, CalculateClassFingerprint, false, \ 1768 "Calculate class fingerprint") \ 1769 \ 1770 /* interpreter debugging */ \ 1771 develop(intx, BinarySwitchThreshold, 5, \ 1772 "Minimal number of lookupswitch entries for rewriting to binary " \ 1773 "switch") \ 1774 \ 1775 develop(intx, StopInterpreterAt, 0, \ 1776 "Stop interpreter execution at specified bytecode number") \ 1777 \ 1778 develop(intx, TraceBytecodesAt, 0, \ 1779 "Trace bytecodes starting with specified bytecode number") \ 1780 \ 1781 /* compiler interface */ \ 1782 develop(intx, CIStart, 0, \ 1783 "The id of the first compilation to permit") \ 1784 \ 1785 develop(intx, CIStop, max_jint, \ 1786 "The id of the last compilation to permit") \ 1787 \ 1788 develop(intx, CIStartOSR, 0, \ 1789 "The id of the first osr compilation to permit " \ 1790 "(CICountOSR must be on)") \ 1791 \ 1792 develop(intx, CIStopOSR, max_jint, \ 1793 "The id of the last osr compilation to permit " \ 1794 "(CICountOSR must be on)") \ 1795 \ 1796 develop(intx, CIBreakAtOSR, -1, \ 1797 "The id of osr compilation to break at") \ 1798 \ 1799 develop(intx, CIBreakAt, -1, \ 1800 "The id of compilation to break at") \ 1801 \ 1802 product(ccstrlist, CompileOnly, "", \ 1803 "List of methods (pkg/class.name) to restrict compilation to") \ 1804 \ 1805 product(ccstr, CompileCommandFile, NULL, \ 1806 "Read compiler commands from this file [.hotspot_compiler]") \ 1807 \ 1808 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1809 "Read compiler directives from this file") \ 1810 \ 1811 product(ccstrlist, CompileCommand, "", \ 1812 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1813 \ 1814 develop(bool, ReplayCompiles, false, \ 1815 "Enable replay of compilations from ReplayDataFile") \ 1816 \ 1817 product(ccstr, ReplayDataFile, NULL, \ 1818 "File containing compilation replay information" \ 1819 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1820 \ 1821 product(ccstr, InlineDataFile, NULL, \ 1822 "File containing inlining replay information" \ 1823 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1824 \ 1825 develop(intx, ReplaySuppressInitializers, 2, \ 1826 "Control handling of class initialization during replay: " \ 1827 "0 - don't do anything special; " \ 1828 "1 - treat all class initializers as empty; " \ 1829 "2 - treat class initializers for application classes as empty; " \ 1830 "3 - allow all class initializers to run during bootstrap but " \ 1831 " pretend they are empty after starting replay") \ 1832 range(0, 3) \ 1833 \ 1834 develop(bool, ReplayIgnoreInitErrors, false, \ 1835 "Ignore exceptions thrown during initialization for replay") \ 1836 \ 1837 product(bool, DumpReplayDataOnError, true, \ 1838 "Record replay data for crashing compiler threads") \ 1839 \ 1840 product(bool, CICompilerCountPerCPU, false, \ 1841 "1 compiler thread for log(N CPUs)") \ 1842 \ 1843 notproduct(intx, CICrashAt, -1, \ 1844 "id of compilation to trigger assert in compiler thread for " \ 1845 "the purpose of testing, e.g. generation of replay data") \ 1846 notproduct(bool, CIObjectFactoryVerify, false, \ 1847 "enable potentially expensive verification in ciObjectFactory") \ 1848 \ 1849 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1850 "Abort VM when method had failed to compile.") \ 1851 \ 1852 /* Priorities */ \ 1853 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1854 \ 1855 product(intx, ThreadPriorityPolicy, 0, \ 1856 "0 : Normal. "\ 1857 " VM chooses priorities that are appropriate for normal "\ 1858 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1859 " to normal native priority. Java priorities below " \ 1860 " NORM_PRIORITY map to lower native priority values. On "\ 1861 " Windows applications are allowed to use higher native "\ 1862 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1863 " not use the highest possible native priority, "\ 1864 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1865 " system threads. On Linux thread priorities are ignored "\ 1866 " because the OS does not support static priority in "\ 1867 " SCHED_OTHER scheduling class which is the only choice for "\ 1868 " non-root, non-realtime applications. "\ 1869 "1 : Aggressive. "\ 1870 " Java thread priorities map over to the entire range of "\ 1871 " native thread priorities. Higher Java thread priorities map "\ 1872 " to higher native thread priorities. This policy should be "\ 1873 " used with care, as sometimes it can cause performance "\ 1874 " degradation in the application and/or the entire system. On "\ 1875 " Linux/BSD/macOS this policy requires root privilege or an "\ 1876 " extended capability.") \ 1877 range(0, 1) \ 1878 \ 1879 product(bool, ThreadPriorityVerbose, false, \ 1880 "Print priority changes") \ 1881 \ 1882 product(intx, CompilerThreadPriority, -1, \ 1883 "The native priority at which compiler threads should run " \ 1884 "(-1 means no change)") \ 1885 range(min_jint, max_jint) \ 1886 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1887 \ 1888 product(intx, VMThreadPriority, -1, \ 1889 "The native priority at which the VM thread should run " \ 1890 "(-1 means no change)") \ 1891 range(-1, 127) \ 1892 \ 1893 product(intx, JavaPriority1_To_OSPriority, -1, \ 1894 "Map Java priorities to OS priorities") \ 1895 range(-1, 127) \ 1896 \ 1897 product(intx, JavaPriority2_To_OSPriority, -1, \ 1898 "Map Java priorities to OS priorities") \ 1899 range(-1, 127) \ 1900 \ 1901 product(intx, JavaPriority3_To_OSPriority, -1, \ 1902 "Map Java priorities to OS priorities") \ 1903 range(-1, 127) \ 1904 \ 1905 product(intx, JavaPriority4_To_OSPriority, -1, \ 1906 "Map Java priorities to OS priorities") \ 1907 range(-1, 127) \ 1908 \ 1909 product(intx, JavaPriority5_To_OSPriority, -1, \ 1910 "Map Java priorities to OS priorities") \ 1911 range(-1, 127) \ 1912 \ 1913 product(intx, JavaPriority6_To_OSPriority, -1, \ 1914 "Map Java priorities to OS priorities") \ 1915 range(-1, 127) \ 1916 \ 1917 product(intx, JavaPriority7_To_OSPriority, -1, \ 1918 "Map Java priorities to OS priorities") \ 1919 range(-1, 127) \ 1920 \ 1921 product(intx, JavaPriority8_To_OSPriority, -1, \ 1922 "Map Java priorities to OS priorities") \ 1923 range(-1, 127) \ 1924 \ 1925 product(intx, JavaPriority9_To_OSPriority, -1, \ 1926 "Map Java priorities to OS priorities") \ 1927 range(-1, 127) \ 1928 \ 1929 product(intx, JavaPriority10_To_OSPriority,-1, \ 1930 "Map Java priorities to OS priorities") \ 1931 range(-1, 127) \ 1932 \ 1933 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1934 "Java thread priority 10 maps to critical scheduling priority") \ 1935 \ 1936 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1937 "Compiler thread(s) run at critical scheduling priority") \ 1938 \ 1939 develop(intx, NewCodeParameter, 0, \ 1940 "Testing Only: Create a dedicated integer parameter before " \ 1941 "putback") \ 1942 \ 1943 /* new oopmap storage allocation */ \ 1944 develop(intx, MinOopMapAllocation, 8, \ 1945 "Minimum number of OopMap entries in an OopMapSet") \ 1946 \ 1947 /* Background Compilation */ \ 1948 develop(intx, LongCompileThreshold, 50, \ 1949 "Used with +TraceLongCompiles") \ 1950 \ 1951 /* recompilation */ \ 1952 product_pd(intx, CompileThreshold, \ 1953 "number of interpreted method invocations before (re-)compiling") \ 1954 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1955 \ 1956 product(double, CompileThresholdScaling, 1.0, \ 1957 "Factor to control when first compilation happens " \ 1958 "(both with and without tiered compilation): " \ 1959 "values greater than 1.0 delay counter overflow, " \ 1960 "values between 0 and 1.0 rush counter overflow, " \ 1961 "value of 1.0 leaves compilation thresholds unchanged " \ 1962 "value of 0.0 is equivalent to -Xint. " \ 1963 "" \ 1964 "Flag can be set as per-method option. " \ 1965 "If a value is specified for a method, compilation thresholds " \ 1966 "for that method are scaled by both the value of the global flag "\ 1967 "and the value of the per-method flag.") \ 1968 range(0.0, DBL_MAX) \ 1969 \ 1970 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1971 "Interpreter (tier 0) invocation notification frequency") \ 1972 range(0, 30) \ 1973 \ 1974 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 1975 "C1 without MDO (tier 2) invocation notification frequency") \ 1976 range(0, 30) \ 1977 \ 1978 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 1979 "C1 with MDO profiling (tier 3) invocation notification " \ 1980 "frequency") \ 1981 range(0, 30) \ 1982 \ 1983 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 1984 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 1985 range(0, 30) \ 1986 \ 1987 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 1988 "Interpreter (tier 0) invocation notification frequency") \ 1989 range(0, 30) \ 1990 \ 1991 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 1992 "C1 without MDO (tier 2) invocation notification frequency") \ 1993 range(0, 30) \ 1994 \ 1995 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 1996 "C1 with MDO profiling (tier 3) invocation notification " \ 1997 "frequency") \ 1998 range(0, 30) \ 1999 \ 2000 product(intx, Tier2CompileThreshold, 0, \ 2001 "threshold at which tier 2 compilation is invoked") \ 2002 range(0, max_jint) \ 2003 \ 2004 product(intx, Tier2BackEdgeThreshold, 0, \ 2005 "Back edge threshold at which tier 2 compilation is invoked") \ 2006 range(0, max_jint) \ 2007 \ 2008 product(intx, Tier3InvocationThreshold, 200, \ 2009 "Compile if number of method invocations crosses this " \ 2010 "threshold") \ 2011 range(0, max_jint) \ 2012 \ 2013 product(intx, Tier3MinInvocationThreshold, 100, \ 2014 "Minimum invocation to compile at tier 3") \ 2015 range(0, max_jint) \ 2016 \ 2017 product(intx, Tier3CompileThreshold, 2000, \ 2018 "Threshold at which tier 3 compilation is invoked (invocation " \ 2019 "minimum must be satisfied)") \ 2020 range(0, max_jint) \ 2021 \ 2022 product(intx, Tier3BackEdgeThreshold, 60000, \ 2023 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2024 range(0, max_jint) \ 2025 \ 2026 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2027 "Compile if number of method invocations crosses this " \ 2028 "threshold if coming from AOT") \ 2029 range(0, max_jint) \ 2030 \ 2031 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2032 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2033 range(0, max_jint) \ 2034 \ 2035 product(intx, Tier3AOTCompileThreshold, 15000, \ 2036 "Threshold at which tier 3 compilation is invoked (invocation " \ 2037 "minimum must be satisfied) if coming from AOT") \ 2038 range(0, max_jint) \ 2039 \ 2040 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2041 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2042 "if coming from AOT") \ 2043 range(0, max_jint) \ 2044 \ 2045 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \ 2046 "Switch to interpreter to profile if the number of method " \ 2047 "invocations crosses this threshold if coming from AOT " \ 2048 "(applicable only with " \ 2049 "CompilationMode=high-only|high-only-quick-internal)") \ 2050 range(0, max_jint) \ 2051 \ 2052 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \ 2053 "Minimum number of invocations to switch to interpreter " \ 2054 "to profile if coming from AOT " \ 2055 "(applicable only with " \ 2056 "CompilationMode=high-only|high-only-quick-internal)") \ 2057 range(0, max_jint) \ 2058 \ 2059 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \ 2060 "Threshold at which to switch to interpreter to profile " \ 2061 "if coming from AOT " \ 2062 "(invocation minimum must be satisfied, " \ 2063 "applicable only with " \ 2064 "CompilationMode=high-only|high-only-quick-internal)") \ 2065 range(0, max_jint) \ 2066 \ 2067 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \ 2068 "Back edge threshold at which to switch to interpreter " \ 2069 "to profile if coming from AOT " \ 2070 "(applicable only with " \ 2071 "CompilationMode=high-only|high-only-quick-internal)") \ 2072 range(0, max_jint) \ 2073 \ 2074 product(intx, Tier4InvocationThreshold, 5000, \ 2075 "Compile if number of method invocations crosses this " \ 2076 "threshold") \ 2077 range(0, max_jint) \ 2078 \ 2079 product(intx, Tier4MinInvocationThreshold, 600, \ 2080 "Minimum invocation to compile at tier 4") \ 2081 range(0, max_jint) \ 2082 \ 2083 product(intx, Tier4CompileThreshold, 15000, \ 2084 "Threshold at which tier 4 compilation is invoked (invocation " \ 2085 "minimum must be satisfied)") \ 2086 range(0, max_jint) \ 2087 \ 2088 product(intx, Tier4BackEdgeThreshold, 40000, \ 2089 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2090 range(0, max_jint) \ 2091 \ 2092 diagnostic(intx, Tier40InvocationThreshold, 5000, \ 2093 "Compile if number of method invocations crosses this " \ 2094 "threshold (applicable only with " \ 2095 "CompilationMode=high-only|high-only-quick-internal)") \ 2096 range(0, max_jint) \ 2097 \ 2098 diagnostic(intx, Tier40MinInvocationThreshold, 600, \ 2099 "Minimum number of invocations to compile at tier 4 " \ 2100 "(applicable only with " \ 2101 "CompilationMode=high-only|high-only-quick-internal)") \ 2102 range(0, max_jint) \ 2103 \ 2104 diagnostic(intx, Tier40CompileThreshold, 10000, \ 2105 "Threshold at which tier 4 compilation is invoked (invocation " \ 2106 "minimum must be satisfied, applicable only with " \ 2107 "CompilationMode=high-only|high-only-quick-internal)") \ 2108 range(0, max_jint) \ 2109 \ 2110 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \ 2111 "Back edge threshold at which tier 4 OSR compilation is invoked " \ 2112 "(applicable only with " \ 2113 "CompilationMode=high-only|high-only-quick-internal)") \ 2114 range(0, max_jint) \ 2115 \ 2116 diagnostic(intx, Tier0Delay, 5, \ 2117 "If C2 queue size grows over this amount per compiler thread " \ 2118 "do not start profiling in the interpreter " \ 2119 "(applicable only with " \ 2120 "CompilationMode=high-only|high-only-quick-internal)") \ 2121 range(0, max_jint) \ 2122 \ 2123 product(intx, Tier3DelayOn, 5, \ 2124 "If C2 queue size grows over this amount per compiler thread " \ 2125 "stop compiling at tier 3 and start compiling at tier 2") \ 2126 range(0, max_jint) \ 2127 \ 2128 product(intx, Tier3DelayOff, 2, \ 2129 "If C2 queue size is less than this amount per compiler thread " \ 2130 "allow methods compiled at tier 2 transition to tier 3") \ 2131 range(0, max_jint) \ 2132 \ 2133 product(intx, Tier3LoadFeedback, 5, \ 2134 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2135 "reaches this amount per compiler thread") \ 2136 range(0, max_jint) \ 2137 \ 2138 product(intx, Tier4LoadFeedback, 3, \ 2139 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2140 "reaches this amount per compiler thread") \ 2141 range(0, max_jint) \ 2142 \ 2143 product(intx, TieredCompileTaskTimeout, 50, \ 2144 "Kill compile task if method was not used within " \ 2145 "given timeout in milliseconds") \ 2146 range(0, max_intx) \ 2147 \ 2148 product(intx, TieredStopAtLevel, 4, \ 2149 "Stop at given compilation level") \ 2150 range(0, 4) \ 2151 \ 2152 product(intx, Tier0ProfilingStartPercentage, 200, \ 2153 "Start profiling in interpreter if the counters exceed tier 3 " \ 2154 "thresholds (tier 4 thresholds with " \ 2155 "CompilationMode=high-only|high-only-quick-internal)" \ 2156 "by the specified percentage") \ 2157 range(0, max_jint) \ 2158 \ 2159 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2160 "Increase the compile threshold for C1 compilation if the code " \ 2161 "cache is filled by the specified percentage") \ 2162 range(0, 99) \ 2163 \ 2164 product(intx, TieredRateUpdateMinTime, 1, \ 2165 "Minimum rate sampling interval (in milliseconds)") \ 2166 range(0, max_intx) \ 2167 \ 2168 product(intx, TieredRateUpdateMaxTime, 25, \ 2169 "Maximum rate sampling interval (in milliseconds)") \ 2170 range(0, max_intx) \ 2171 \ 2172 product(ccstr, CompilationMode, "default", \ 2173 "Compilation modes: " \ 2174 "default: normal tiered compilation; " \ 2175 "quick-only: C1-only mode; " \ 2176 "high-only: C2/JVMCI-only mode; " \ 2177 "high-only-quick-internal: C2/JVMCI-only mode, " \ 2178 "with JVMCI compiler compiled with C1.") \ 2179 \ 2180 product_pd(bool, TieredCompilation, \ 2181 "Enable tiered compilation") \ 2182 \ 2183 product(bool, PrintTieredEvents, false, \ 2184 "Print tiered events notifications") \ 2185 \ 2186 product_pd(intx, OnStackReplacePercentage, \ 2187 "NON_TIERED number of method invocations/branches (expressed as " \ 2188 "% of CompileThreshold) before (re-)compiling OSR code") \ 2189 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2190 \ 2191 product(intx, InterpreterProfilePercentage, 33, \ 2192 "NON_TIERED number of method invocations/branches (expressed as " \ 2193 "% of CompileThreshold) before profiling in the interpreter") \ 2194 range(0, 100) \ 2195 \ 2196 develop(intx, DesiredMethodLimit, 8000, \ 2197 "The desired maximum method size (in bytecodes) after inlining") \ 2198 \ 2199 develop(intx, HugeMethodLimit, 8000, \ 2200 "Don't compile methods larger than this if " \ 2201 "+DontCompileHugeMethods") \ 2202 \ 2203 /* Properties for Java libraries */ \ 2204 \ 2205 product(uint64_t, MaxDirectMemorySize, 0, \ 2206 "Maximum total size of NIO direct-buffer allocations") \ 2207 range(0, max_jlong) \ 2208 \ 2209 /* Flags used for temporary code during development */ \ 2210 \ 2211 diagnostic(bool, UseNewCode, false, \ 2212 "Testing Only: Use the new version while testing") \ 2213 \ 2214 diagnostic(bool, UseNewCode2, false, \ 2215 "Testing Only: Use the new version while testing") \ 2216 \ 2217 diagnostic(bool, UseNewCode3, false, \ 2218 "Testing Only: Use the new version while testing") \ 2219 \ 2220 /* flags for performance data collection */ \ 2221 \ 2222 product(bool, UsePerfData, true, \ 2223 "Flag to disable jvmstat instrumentation for performance testing "\ 2224 "and problem isolation purposes") \ 2225 \ 2226 product(bool, PerfDataSaveToFile, false, \ 2227 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2228 \ 2229 product(ccstr, PerfDataSaveFile, NULL, \ 2230 "Save PerfData memory to the specified absolute pathname. " \ 2231 "The string %p in the file name (if present) " \ 2232 "will be replaced by pid") \ 2233 \ 2234 product(intx, PerfDataSamplingInterval, 50, \ 2235 "Data sampling interval (in milliseconds)") \ 2236 range(PeriodicTask::min_interval, max_jint) \ 2237 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2238 \ 2239 product(bool, PerfDisableSharedMem, false, \ 2240 "Store performance data in standard memory") \ 2241 \ 2242 product(intx, PerfDataMemorySize, 32*K, \ 2243 "Size of performance data memory region. Will be rounded " \ 2244 "up to a multiple of the native os page size.") \ 2245 range(128, 32*64*K) \ 2246 \ 2247 product(intx, PerfMaxStringConstLength, 1024, \ 2248 "Maximum PerfStringConstant string length before truncation") \ 2249 range(32, 32*K) \ 2250 \ 2251 product(bool, PerfAllowAtExitRegistration, false, \ 2252 "Allow registration of atexit() methods") \ 2253 \ 2254 product(bool, PerfBypassFileSystemCheck, false, \ 2255 "Bypass Win32 file system criteria checks (Windows Only)") \ 2256 \ 2257 product(intx, UnguardOnExecutionViolation, 0, \ 2258 "Unguard page and retry on no-execute fault (Win32 only) " \ 2259 "0=off, 1=conservative, 2=aggressive") \ 2260 range(0, 2) \ 2261 \ 2262 /* Serviceability Support */ \ 2263 \ 2264 product(bool, ManagementServer, false, \ 2265 "Create JMX Management Server") \ 2266 \ 2267 product(bool, DisableAttachMechanism, false, \ 2268 "Disable mechanism that allows tools to attach to this VM") \ 2269 \ 2270 product(bool, StartAttachListener, false, \ 2271 "Always start Attach Listener at VM startup") \ 2272 \ 2273 product(bool, EnableDynamicAgentLoading, true, \ 2274 "Allow tools to load agents with the attach mechanism") \ 2275 \ 2276 manageable(bool, PrintConcurrentLocks, false, \ 2277 "Print java.util.concurrent locks in thread dump") \ 2278 \ 2279 /* Shared spaces */ \ 2280 \ 2281 product(bool, UseSharedSpaces, true, \ 2282 "Use shared spaces for metadata") \ 2283 \ 2284 product(bool, VerifySharedSpaces, false, \ 2285 "Verify integrity of shared spaces") \ 2286 \ 2287 product(bool, RequireSharedSpaces, false, \ 2288 "Require shared spaces for metadata") \ 2289 \ 2290 product(bool, DumpSharedSpaces, false, \ 2291 "Special mode: JVM reads a class list, loads classes, builds " \ 2292 "shared spaces, and dumps the shared spaces to a file to be " \ 2293 "used in future JVM runs") \ 2294 \ 2295 product(bool, DynamicDumpSharedSpaces, false, \ 2296 "Dynamic archive") \ 2297 \ 2298 product(bool, PrintSharedArchiveAndExit, false, \ 2299 "Print shared archive file contents") \ 2300 \ 2301 product(bool, PrintSharedDictionary, false, \ 2302 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2303 "dictionary") \ 2304 \ 2305 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2306 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2307 "Address to allocate shared memory region for class data") \ 2308 range(0, SIZE_MAX) \ 2309 \ 2310 product(ccstr, SharedArchiveConfigFile, NULL, \ 2311 "Data to add to the CDS archive file") \ 2312 \ 2313 product(uintx, SharedSymbolTableBucketSize, 4, \ 2314 "Average number of symbols per bucket in shared table") \ 2315 range(2, 246) \ 2316 \ 2317 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2318 "Allow Java agent to be run with CDS dumping") \ 2319 \ 2320 diagnostic(bool, PrintMethodHandleStubs, false, \ 2321 "Print generated stub code for method handles") \ 2322 \ 2323 develop(bool, TraceMethodHandles, false, \ 2324 "trace internal method handle operations") \ 2325 \ 2326 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2327 "perform extra checks when constructing method handles") \ 2328 \ 2329 diagnostic(bool, ShowHiddenFrames, false, \ 2330 "show method handle implementation frames (usually hidden)") \ 2331 \ 2332 experimental(bool, TrustFinalNonStaticFields, false, \ 2333 "trust final non-static declarations for constant folding") \ 2334 \ 2335 diagnostic(bool, FoldStableValues, true, \ 2336 "Optimize loads from stable fields (marked w/ @Stable)") \ 2337 \ 2338 develop(bool, TraceInvokeDynamic, false, \ 2339 "trace internal invoke dynamic operations") \ 2340 \ 2341 diagnostic(int, UseBootstrapCallInfo, 1, \ 2342 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2343 "resolved before the bootstrap method is called; 1: when a BSM " \ 2344 "that may accept a BootstrapCallInfo is detected, use that API " \ 2345 "to pass BSM arguments, which allows the BSM to delay their " \ 2346 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2347 "via that API, instead of with the eagerly-resolved array.") \ 2348 \ 2349 diagnostic(bool, PauseAtStartup, false, \ 2350 "Causes the VM to pause at startup time and wait for the pause " \ 2351 "file to be removed (default: ./vm.paused.<pid>)") \ 2352 \ 2353 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2354 "The file to create and for whose removal to await when pausing " \ 2355 "at startup. (default: ./vm.paused.<pid>)") \ 2356 \ 2357 diagnostic(bool, PauseAtExit, false, \ 2358 "Pause and wait for keypress on exit if a debugger is attached") \ 2359 \ 2360 product(bool, ExtendedDTraceProbes, false, \ 2361 "Enable performance-impacting dtrace probes") \ 2362 \ 2363 product(bool, DTraceMethodProbes, false, \ 2364 "Enable dtrace probes for method-entry and method-exit") \ 2365 \ 2366 product(bool, DTraceAllocProbes, false, \ 2367 "Enable dtrace probes for object allocation") \ 2368 \ 2369 product(bool, DTraceMonitorProbes, false, \ 2370 "Enable dtrace probes for monitor events") \ 2371 \ 2372 product(bool, RelaxAccessControlCheck, false, \ 2373 "Relax the access control checks in the verifier") \ 2374 \ 2375 product(uintx, StringTableSize, defaultStringTableSize, \ 2376 "Number of buckets in the interned String table " \ 2377 "(will be rounded to nearest higher power of 2)") \ 2378 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 2379 \ 2380 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2381 "Number of buckets in the JVM internal Symbol table") \ 2382 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 2383 \ 2384 product(bool, UseStringDeduplication, false, \ 2385 "Use string deduplication") \ 2386 \ 2387 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2388 "A string must reach this age (or be promoted to an old region) " \ 2389 "to be considered for deduplication") \ 2390 range(1, markWord::max_age) \ 2391 \ 2392 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2393 "Force table resize every time the table is scanned") \ 2394 \ 2395 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2396 "Force table rehash every time the table is scanned") \ 2397 \ 2398 diagnostic(bool, WhiteBoxAPI, false, \ 2399 "Enable internal testing APIs") \ 2400 \ 2401 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2402 "Default survivor space alignment in bytes") \ 2403 range(8, 256) \ 2404 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2405 \ 2406 product(ccstr, DumpLoadedClassList, NULL, \ 2407 "Dump the names all loaded classes, that could be stored into " \ 2408 "the CDS archive, in the specified file") \ 2409 \ 2410 product(ccstr, SharedClassListFile, NULL, \ 2411 "Override the default CDS class list") \ 2412 \ 2413 product(ccstr, SharedArchiveFile, NULL, \ 2414 "Override the default location of the CDS archive file") \ 2415 \ 2416 product(ccstr, ArchiveClassesAtExit, NULL, \ 2417 "The path and name of the dynamic archive file") \ 2418 \ 2419 product(ccstr, ExtraSharedClassListFile, NULL, \ 2420 "Extra classlist for building the CDS archive file") \ 2421 \ 2422 diagnostic(intx, ArchiveRelocationMode, 0, \ 2423 "(0) first map at preferred address, and if " \ 2424 "unsuccessful, map at alternative address (default); " \ 2425 "(1) always map at alternative address; " \ 2426 "(2) always map at preferred address, and if unsuccessful, " \ 2427 "do not map the archive") \ 2428 range(0, 2) \ 2429 \ 2430 experimental(size_t, ArrayAllocatorMallocLimit, \ 2431 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2432 "Allocation less than this value will be allocated " \ 2433 "using malloc. Larger allocations will use mmap.") \ 2434 \ 2435 experimental(bool, AlwaysAtomicAccesses, false, \ 2436 "Accesses to all variables should always be atomic") \ 2437 \ 2438 diagnostic(bool, UseUnalignedAccesses, false, \ 2439 "Use unaligned memory accesses in Unsafe") \ 2440 \ 2441 product_pd(bool, PreserveFramePointer, \ 2442 "Use the FP register for holding the frame pointer " \ 2443 "and not as a general purpose register.") \ 2444 \ 2445 diagnostic(bool, CheckIntrinsics, true, \ 2446 "When a class C is loaded, check that " \ 2447 "(1) all intrinsics defined by the VM for class C are present "\ 2448 "in the loaded class file and are marked with the " \ 2449 "@HotSpotIntrinsicCandidate annotation, that " \ 2450 "(2) there is an intrinsic registered for all loaded methods " \ 2451 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2452 "annotation, and that " \ 2453 "(3) no orphan methods exist for class C (i.e., methods for " \ 2454 "which the VM declares an intrinsic but that are not declared "\ 2455 "in the loaded class C. " \ 2456 "Check (3) is available only in debug builds.") \ 2457 \ 2458 diagnostic_pd(intx, InitArrayShortSize, \ 2459 "Threshold small size (in bytes) for clearing arrays. " \ 2460 "Anything this size or smaller may get converted to discrete " \ 2461 "scalar stores.") \ 2462 range(0, max_intx) \ 2463 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2464 \ 2465 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2466 "Disable backwards compatibility for compile commands.") \ 2467 \ 2468 diagnostic(bool, CompilerDirectivesPrint, false, \ 2469 "Print compiler directives on installation.") \ 2470 diagnostic(int, CompilerDirectivesLimit, 50, \ 2471 "Limit on number of compiler directives.") \ 2472 \ 2473 product(ccstr, AllocateHeapAt, NULL, \ 2474 "Path to the directoy where a temporary file will be created " \ 2475 "to use as the backing store for Java Heap.") \ 2476 \ 2477 experimental(ccstr, AllocateOldGenAt, NULL, \ 2478 "Path to the directoy where a temporary file will be " \ 2479 "created to use as the backing store for old generation." \ 2480 "File of size Xmx is pre-allocated for performance reason, so" \ 2481 "we need that much space available") \ 2482 \ 2483 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2484 "Run periodic metaspace verifications (0 - none, " \ 2485 "1 - always, >1 every nth interval)") \ 2486 \ 2487 diagnostic(bool, ShowRegistersOnAssert, true, \ 2488 "On internal errors, include registers in error report.") \ 2489 \ 2490 diagnostic(bool, UseSwitchProfiling, true, \ 2491 "leverage profiling for table/lookup switch") \ 2492 \ 2493 develop(bool, TraceMemoryWriteback, false, \ 2494 "Trace memory writeback operations") \ 2495 \ 2496 JFR_ONLY(product(bool, FlightRecorder, false, \ 2497 "(Deprecated) Enable Flight Recorder")) \ 2498 \ 2499 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2500 "Flight Recorder options")) \ 2501 \ 2502 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2503 "Start flight recording with options")) \ 2504 \ 2505 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2506 "Use platform unstable time where supported for timestamps only") \ 2507 \ 2508 product(bool, EnableValhalla, true, \ 2509 "Enable experimental Valhalla features") \ 2510 \ 2511 product_pd(bool, ValueTypePassFieldsAsArgs, \ 2512 "Pass each value type field as an argument at calls") \ 2513 \ 2514 product_pd(bool, ValueTypeReturnedAsFields, \ 2515 "Return fields instead of a value type reference") \ 2516 \ 2517 develop(bool, StressValueTypeReturnedAsFields, false, \ 2518 "Stress return of fields instead of a value type reference") \ 2519 \ 2520 develop(bool, ScalarizeValueTypes, true, \ 2521 "Scalarize value types in compiled code") \ 2522 \ 2523 product(bool, PrintNewLayout, false, \ 2524 "Print layout compute by new algorithm") \ 2525 \ 2526 product(bool, PrintFlattenableLayouts, false, \ 2527 "Print layout of inline classes and classes with " \ 2528 "flattenable fields") \ 2529 \ 2530 product(bool, UseNewLayout, true, \ 2531 "(Deprecated) Use new algorithm to compute field layouts") \ 2532 \ 2533 product(bool, UseEmptySlotsInSupers, true, \ 2534 "Allow allocating fields in empty slots of super-classes") \ 2535 \ 2536 2537 2538 2539 // Interface macros 2540 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2541 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2542 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2543 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2544 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2545 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2546 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2547 #ifdef PRODUCT 2548 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2549 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2550 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2551 #else 2552 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2553 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2554 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2555 #endif // PRODUCT 2556 // Special LP64 flags, product only needed for now. 2557 #ifdef _LP64 2558 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2559 #else 2560 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2561 #endif // _LP64 2562 2563 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2564 DECLARE_PD_DEVELOPER_FLAG, \ 2565 DECLARE_PRODUCT_FLAG, \ 2566 DECLARE_PD_PRODUCT_FLAG, \ 2567 DECLARE_DIAGNOSTIC_FLAG, \ 2568 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2569 DECLARE_EXPERIMENTAL_FLAG, \ 2570 DECLARE_NOTPRODUCT_FLAG, \ 2571 DECLARE_MANAGEABLE_FLAG, \ 2572 DECLARE_PRODUCT_RW_FLAG, \ 2573 DECLARE_LP64_PRODUCT_FLAG, \ 2574 IGNORE_RANGE, \ 2575 IGNORE_CONSTRAINT) 2576 2577 #endif // SHARE_RUNTIME_GLOBALS_HPP