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(bool, UseAES, false, \ 218 "Control whether AES instructions are used when available") \ 219 \ 220 product(bool, UseFMA, false, \ 221 "Control whether FMA instructions are used when available") \ 222 \ 223 product(bool, UseSHA, false, \ 224 "Control whether SHA instructions are used when available") \ 225 \ 226 diagnostic(bool, UseGHASHIntrinsics, false, \ 227 "Use intrinsics for GHASH versions of crypto") \ 228 \ 229 product(bool, UseBASE64Intrinsics, false, \ 230 "Use intrinsics for java.util.Base64") \ 231 \ 232 product(size_t, LargePageSizeInBytes, 0, \ 233 "Large page size (0 to let VM choose the page size)") \ 234 range(0, max_uintx) \ 235 \ 236 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 237 "Use large pages if maximum heap is at least this big") \ 238 range(0, max_uintx) \ 239 \ 240 product(bool, ForceTimeHighResolution, false, \ 241 "Using high time resolution (for Win32 only)") \ 242 \ 243 develop(bool, TracePcPatching, false, \ 244 "Trace usage of frame::patch_pc") \ 245 \ 246 develop(bool, TraceRelocator, false, \ 247 "Trace the bytecode relocator") \ 248 \ 249 develop(bool, TraceLongCompiles, false, \ 250 "Print out every time compilation is longer than " \ 251 "a given threshold") \ 252 \ 253 diagnostic(bool, SafepointALot, false, \ 254 "Generate a lot of safepoints. This works with " \ 255 "GuaranteedSafepointInterval") \ 256 \ 257 diagnostic(bool, HandshakeALot, false, \ 258 "Generate a lot of handshakes. This works with " \ 259 "GuaranteedSafepointInterval") \ 260 \ 261 product_pd(bool, BackgroundCompilation, \ 262 "A thread requesting compilation is not blocked during " \ 263 "compilation") \ 264 \ 265 product(bool, PrintVMQWaitTime, false, \ 266 "(Deprecated) Print out the waiting time in VM operation queue") \ 267 \ 268 product(bool, MethodFlushing, true, \ 269 "Reclamation of zombie and not-entrant methods") \ 270 \ 271 develop(bool, VerifyStack, false, \ 272 "Verify stack of each thread when it is entering a runtime call") \ 273 \ 274 diagnostic(bool, ForceUnreachable, false, \ 275 "Make all non code cache addresses to be unreachable by " \ 276 "forcing use of 64bit literal fixups") \ 277 \ 278 notproduct(bool, StressDerivedPointers, false, \ 279 "Force scavenge when a derived pointer is detected on stack " \ 280 "after rtm call") \ 281 \ 282 develop(bool, TraceDerivedPointers, false, \ 283 "Trace traversal of derived pointers on stack") \ 284 \ 285 notproduct(bool, TraceCodeBlobStacks, false, \ 286 "Trace stack-walk of codeblobs") \ 287 \ 288 notproduct(bool, PrintRewrites, false, \ 289 "Print methods that are being rewritten") \ 290 \ 291 product(bool, UseInlineCaches, true, \ 292 "Use Inline Caches for virtual calls ") \ 293 \ 294 diagnostic(bool, InlineArrayCopy, true, \ 295 "Inline arraycopy native that is known to be part of " \ 296 "base library DLL") \ 297 \ 298 diagnostic(bool, InlineObjectHash, true, \ 299 "Inline Object::hashCode() native that is known to be part " \ 300 "of base library DLL") \ 301 \ 302 diagnostic(bool, InlineNatives, true, \ 303 "Inline natives that are known to be part of base library DLL") \ 304 \ 305 diagnostic(bool, InlineMathNatives, true, \ 306 "Inline SinD, CosD, etc.") \ 307 \ 308 diagnostic(bool, InlineClassNatives, true, \ 309 "Inline Class.isInstance, etc") \ 310 \ 311 diagnostic(bool, InlineThreadNatives, true, \ 312 "Inline Thread.currentThread, etc") \ 313 \ 314 diagnostic(bool, InlineUnsafeOps, true, \ 315 "Inline memory ops (native methods) from Unsafe") \ 316 \ 317 product(bool, CriticalJNINatives, true, \ 318 "Check for critical JNI entry points") \ 319 \ 320 notproduct(bool, StressCriticalJNINatives, false, \ 321 "Exercise register saving code in critical natives") \ 322 \ 323 diagnostic(bool, UseAESIntrinsics, false, \ 324 "Use intrinsics for AES versions of crypto") \ 325 \ 326 diagnostic(bool, UseAESCTRIntrinsics, false, \ 327 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 328 \ 329 diagnostic(bool, UseSHA1Intrinsics, false, \ 330 "Use intrinsics for SHA-1 crypto hash function. " \ 331 "Requires that UseSHA is enabled.") \ 332 \ 333 diagnostic(bool, UseSHA256Intrinsics, false, \ 334 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 335 "Requires that UseSHA is enabled.") \ 336 \ 337 diagnostic(bool, UseSHA512Intrinsics, false, \ 338 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 339 "Requires that UseSHA is enabled.") \ 340 \ 341 diagnostic(bool, UseCRC32Intrinsics, false, \ 342 "use intrinsics for java.util.zip.CRC32") \ 343 \ 344 diagnostic(bool, UseCRC32CIntrinsics, false, \ 345 "use intrinsics for java.util.zip.CRC32C") \ 346 \ 347 diagnostic(bool, UseAdler32Intrinsics, false, \ 348 "use intrinsics for java.util.zip.Adler32") \ 349 \ 350 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 351 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 352 \ 353 diagnostic(ccstrlist, DisableIntrinsic, "", \ 354 "do not expand intrinsics whose (internal) names appear here") \ 355 \ 356 develop(bool, TraceCallFixup, false, \ 357 "Trace all call fixups") \ 358 \ 359 develop(bool, DeoptimizeALot, false, \ 360 "Deoptimize at every exit from the runtime system") \ 361 \ 362 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 363 "A comma separated list of bcis to deoptimize at") \ 364 \ 365 develop(bool, DeoptimizeRandom, false, \ 366 "Deoptimize random frames on random exit from the runtime system")\ 367 \ 368 notproduct(bool, ZombieALot, false, \ 369 "Create zombies (non-entrant) at exit from the runtime system") \ 370 \ 371 notproduct(bool, WalkStackALot, false, \ 372 "Trace stack (no print) at every exit from the runtime system") \ 373 \ 374 product(bool, Debugging, false, \ 375 "Set when executing debug methods in debug.cpp " \ 376 "(to prevent triggering assertions)") \ 377 \ 378 notproduct(bool, VerifyLastFrame, false, \ 379 "Verify oops on last frame on entry to VM") \ 380 \ 381 product(bool, SafepointTimeout, false, \ 382 "Time out and warn or fail after SafepointTimeoutDelay " \ 383 "milliseconds if failed to reach safepoint") \ 384 \ 385 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 386 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 387 \ 388 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 389 "Abort upon failure to complete VM operation promptly") \ 390 \ 391 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 392 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 393 range(0, max_intx) \ 394 \ 395 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 396 /* typically, at most a few retries are needed */ \ 397 product(intx, SuspendRetryCount, 50, \ 398 "Maximum retry count for an external suspend request") \ 399 range(0, max_intx) \ 400 \ 401 product(intx, SuspendRetryDelay, 5, \ 402 "Milliseconds to delay per retry (* current_retry_count)") \ 403 range(0, max_intx) \ 404 \ 405 product(bool, AssertOnSuspendWaitFailure, false, \ 406 "Assert/Guarantee on external suspend wait failure") \ 407 \ 408 product(bool, TraceSuspendWaitFailures, false, \ 409 "Trace external suspend wait failures") \ 410 \ 411 product(bool, MaxFDLimit, true, \ 412 "Bump the number of file descriptors to maximum in Solaris") \ 413 \ 414 diagnostic(bool, LogEvents, true, \ 415 "Enable the various ring buffer event logs") \ 416 \ 417 diagnostic(uintx, LogEventsBufferEntries, 20, \ 418 "Number of ring buffer event logs") \ 419 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 420 \ 421 diagnostic(bool, BytecodeVerificationRemote, true, \ 422 "Enable the Java bytecode verifier for remote classes") \ 423 \ 424 diagnostic(bool, BytecodeVerificationLocal, false, \ 425 "Enable the Java bytecode verifier for local classes") \ 426 \ 427 develop(bool, ForceFloatExceptions, trueInDebug, \ 428 "Force exceptions on FP stack under/overflow") \ 429 \ 430 develop(bool, VerifyStackAtCalls, false, \ 431 "Verify that the stack pointer is unchanged after calls") \ 432 \ 433 develop(bool, TraceJavaAssertions, false, \ 434 "Trace java language assertions") \ 435 \ 436 notproduct(bool, VerifyCodeCache, false, \ 437 "Verify code cache on memory allocation/deallocation") \ 438 \ 439 develop(bool, UseMallocOnly, false, \ 440 "Use only malloc/free for allocation (no resource area/arena)") \ 441 \ 442 develop(bool, ZapResourceArea, trueInDebug, \ 443 "Zap freed resource/arena space with 0xABABABAB") \ 444 \ 445 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 446 "Zap freed VM handle space with 0xBCBCBCBC") \ 447 \ 448 notproduct(bool, ZapStackSegments, trueInDebug, \ 449 "Zap allocated/freed stack segments with 0xFADFADED") \ 450 \ 451 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 452 "Zap unused heap space with 0xBAADBABE") \ 453 \ 454 develop(bool, CheckZapUnusedHeapArea, false, \ 455 "Check zapping of unused heap space") \ 456 \ 457 develop(bool, ZapFillerObjects, trueInDebug, \ 458 "Zap filler objects with 0xDEAFBABE") \ 459 \ 460 develop(bool, PrintVMMessages, true, \ 461 "Print VM messages on console") \ 462 \ 463 notproduct(uintx, ErrorHandlerTest, 0, \ 464 "If > 0, provokes an error after VM initialization; the value " \ 465 "determines which error to provoke. See test_error_handler() " \ 466 "in vmError.cpp.") \ 467 \ 468 notproduct(uintx, TestCrashInErrorHandler, 0, \ 469 "If > 0, provokes an error inside VM error handler (a secondary " \ 470 "crash). see test_error_handler() in vmError.cpp") \ 471 \ 472 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 473 "If true, tests SafeFetch inside error handler.") \ 474 \ 475 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 476 "If true, simulates an unresponsive error handler.") \ 477 \ 478 develop(bool, Verbose, false, \ 479 "Print additional debugging information from other modes") \ 480 \ 481 develop(bool, PrintMiscellaneous, false, \ 482 "Print uncategorized debugging information (requires +Verbose)") \ 483 \ 484 develop(bool, WizardMode, false, \ 485 "Print much more debugging information") \ 486 \ 487 product(bool, ShowMessageBoxOnError, false, \ 488 "Keep process alive on VM fatal error") \ 489 \ 490 product(bool, CreateCoredumpOnCrash, true, \ 491 "Create core/mini dump on VM fatal error") \ 492 \ 493 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 494 "Timeout, in seconds, to limit the time spent on writing an " \ 495 "error log in case of a crash.") \ 496 range(0, (uint64_t)max_jlong/1000) \ 497 \ 498 product_pd(bool, UseOSErrorReporting, \ 499 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 500 \ 501 product(bool, SuppressFatalErrorMessage, false, \ 502 "Report NO fatal error message (avoid deadlock)") \ 503 \ 504 product(ccstrlist, OnError, "", \ 505 "Run user-defined commands on fatal error; see VMError.cpp " \ 506 "for examples") \ 507 \ 508 product(ccstrlist, OnOutOfMemoryError, "", \ 509 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 510 \ 511 manageable(bool, HeapDumpBeforeFullGC, false, \ 512 "Dump heap to file before any major stop-the-world GC") \ 513 \ 514 manageable(bool, HeapDumpAfterFullGC, false, \ 515 "Dump heap to file after any major stop-the-world GC") \ 516 \ 517 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 518 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 519 \ 520 manageable(ccstr, HeapDumpPath, NULL, \ 521 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 522 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 523 "in the working directory)") \ 524 \ 525 develop(bool, BreakAtWarning, false, \ 526 "Execute breakpoint upon encountering VM warning") \ 527 \ 528 product(ccstr, NativeMemoryTracking, "off", \ 529 "Native memory tracking options") \ 530 \ 531 diagnostic(bool, PrintNMTStatistics, false, \ 532 "Print native memory tracking summary data if it is on") \ 533 \ 534 diagnostic(bool, LogCompilation, false, \ 535 "Log compilation activity in detail to LogFile") \ 536 \ 537 product(bool, PrintCompilation, false, \ 538 "Print compilations") \ 539 \ 540 product(bool, PrintExtendedThreadInfo, false, \ 541 "Print more information in thread dump") \ 542 \ 543 diagnostic(intx, ScavengeRootsInCode, 2, \ 544 "0: do not allow scavengable oops in the code cache; " \ 545 "1: allow scavenging from the code cache; " \ 546 "2: emit as many constants as the compiler can see") \ 547 range(0, 2) \ 548 \ 549 product(bool, AlwaysRestoreFPU, false, \ 550 "Restore the FPU control word after every JNI call (expensive)") \ 551 \ 552 diagnostic(bool, PrintCompilation2, false, \ 553 "Print additional statistics per compilation") \ 554 \ 555 diagnostic(bool, PrintAdapterHandlers, false, \ 556 "Print code generated for i2c/c2i adapters") \ 557 \ 558 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 559 "Verify that i2c/c2i adapters are called properly") \ 560 \ 561 develop(bool, VerifyAdapterSharing, false, \ 562 "Verify that the code for shared adapters is the equivalent") \ 563 \ 564 diagnostic(bool, PrintAssembly, false, \ 565 "Print assembly code (using external disassembler.so)") \ 566 \ 567 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 568 "Print options string passed to disassembler.so") \ 569 \ 570 notproduct(bool, PrintNMethodStatistics, false, \ 571 "Print a summary statistic for the generated nmethods") \ 572 \ 573 diagnostic(bool, PrintNMethods, false, \ 574 "Print assembly code for nmethods when generated") \ 575 \ 576 diagnostic(bool, PrintNativeNMethods, false, \ 577 "Print assembly code for native nmethods when generated") \ 578 \ 579 develop(bool, PrintDebugInfo, false, \ 580 "Print debug information for all nmethods when generated") \ 581 \ 582 develop(bool, PrintRelocations, false, \ 583 "Print relocation information for all nmethods when generated") \ 584 \ 585 develop(bool, PrintDependencies, false, \ 586 "Print dependency information for all nmethods when generated") \ 587 \ 588 develop(bool, PrintExceptionHandlers, false, \ 589 "Print exception handler tables for all nmethods when generated") \ 590 \ 591 develop(bool, StressCompiledExceptionHandlers, false, \ 592 "Exercise compiled exception handlers") \ 593 \ 594 develop(bool, InterceptOSException, false, \ 595 "Start debugger when an implicit OS (e.g. NULL) " \ 596 "exception happens") \ 597 \ 598 product(bool, PrintCodeCache, false, \ 599 "Print the code cache memory usage when exiting") \ 600 \ 601 develop(bool, PrintCodeCache2, false, \ 602 "Print detailed usage information on the code cache when exiting")\ 603 \ 604 product(bool, PrintCodeCacheOnCompilation, false, \ 605 "Print the code cache memory usage each time a method is " \ 606 "compiled") \ 607 \ 608 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 609 "Print code heap usage statistics on exit and on full condition") \ 610 \ 611 diagnostic(bool, PrintStubCode, false, \ 612 "Print generated stub code") \ 613 \ 614 product(bool, StackTraceInThrowable, true, \ 615 "Collect backtrace in throwable when exception happens") \ 616 \ 617 product(bool, OmitStackTraceInFastThrow, true, \ 618 "Omit backtraces for some 'hot' exceptions in optimized code") \ 619 \ 620 manageable(bool, ShowCodeDetailsInExceptionMessages, false, \ 621 "Show exception messages from RuntimeExceptions that contain " \ 622 "snippets of the failing code. Disable this to improve privacy.") \ 623 \ 624 product(bool, PrintWarnings, true, \ 625 "Print JVM warnings to output stream") \ 626 \ 627 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 628 "Print warnings for stalled SpinLocks") \ 629 \ 630 product(bool, RegisterFinalizersAtInit, true, \ 631 "Register finalizable objects at end of Object.<init> or " \ 632 "after allocation") \ 633 \ 634 develop(bool, RegisterReferences, true, \ 635 "Tell whether the VM should register soft/weak/final/phantom " \ 636 "references") \ 637 \ 638 develop(bool, IgnoreRewrites, false, \ 639 "Suppress rewrites of bytecodes in the oopmap generator. " \ 640 "This is unsafe!") \ 641 \ 642 develop(bool, PrintCodeCacheExtension, false, \ 643 "Print extension of code cache") \ 644 \ 645 develop(bool, UsePrivilegedStack, true, \ 646 "Enable the security JVM functions") \ 647 \ 648 develop(bool, ProtectionDomainVerification, true, \ 649 "Verify protection domain before resolution in system dictionary")\ 650 \ 651 product(bool, ClassUnloading, true, \ 652 "Do unloading of classes") \ 653 \ 654 product(bool, ClassUnloadingWithConcurrentMark, true, \ 655 "Do unloading of classes with a concurrent marking cycle") \ 656 \ 657 develop(bool, DisableStartThread, false, \ 658 "Disable starting of additional Java threads " \ 659 "(for debugging only)") \ 660 \ 661 develop(bool, MemProfiling, false, \ 662 "Write memory usage profiling to log file") \ 663 \ 664 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 665 "Print the system dictionary at exit") \ 666 \ 667 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 668 "Dynamically resize system dictionaries as needed") \ 669 \ 670 product(bool, AlwaysLockClassLoader, false, \ 671 "Require the VM to acquire the class loader lock before calling " \ 672 "loadClass() even for class loaders registering " \ 673 "as parallel capable") \ 674 \ 675 product(bool, AllowParallelDefineClass, false, \ 676 "Allow parallel defineClass requests for class loaders " \ 677 "registering as parallel capable") \ 678 \ 679 product_pd(bool, DontYieldALot, \ 680 "Throw away obvious excess yield calls") \ 681 \ 682 develop(bool, UseDetachedThreads, true, \ 683 "Use detached threads that are recycled upon termination " \ 684 "(for Solaris only)") \ 685 \ 686 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 687 "Disable the use of stack guard pages if the JVM is loaded " \ 688 "on the primordial process thread") \ 689 \ 690 product(bool, UseLWPSynchronization, true, \ 691 "Use LWP-based instead of libthread-based synchronization " \ 692 "(SPARC only)") \ 693 \ 694 product(intx, MonitorBound, 0, "(Deprecated) Bound Monitor population") \ 695 range(0, max_jint) \ 696 \ 697 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 698 "Percentage of used monitors before triggering cleanup " \ 699 "safepoint which deflates monitors (0 is off). " \ 700 "The check is performed on GuaranteedSafepointInterval.") \ 701 range(0, 100) \ 702 \ 703 experimental(intx, hashCode, 5, \ 704 "(Unstable) select hashCode generation algorithm") \ 705 \ 706 product(bool, FilterSpuriousWakeups, true, \ 707 "When true prevents OS-level spurious, or premature, wakeups " \ 708 "from Object.wait (Ignored for Windows)") \ 709 \ 710 develop(bool, UsePthreads, false, \ 711 "Use pthread-based instead of libthread-based synchronization " \ 712 "(SPARC only)") \ 713 \ 714 product(bool, ReduceSignalUsage, false, \ 715 "Reduce the use of OS signals in Java and/or the VM") \ 716 \ 717 develop(bool, LoadLineNumberTables, true, \ 718 "Tell whether the class file parser loads line number tables") \ 719 \ 720 develop(bool, LoadLocalVariableTables, true, \ 721 "Tell whether the class file parser loads local variable tables") \ 722 \ 723 develop(bool, LoadLocalVariableTypeTables, true, \ 724 "Tell whether the class file parser loads local variable type" \ 725 "tables") \ 726 \ 727 product(bool, AllowUserSignalHandlers, false, \ 728 "Do not complain if the application installs signal handlers " \ 729 "(Solaris & Linux only)") \ 730 \ 731 product(bool, UseSignalChaining, true, \ 732 "Use signal-chaining to invoke signal handlers installed " \ 733 "by the application (Solaris & Linux only)") \ 734 \ 735 product(bool, RestoreMXCSROnJNICalls, false, \ 736 "Restore MXCSR when returning from JNI calls") \ 737 \ 738 product(bool, CheckJNICalls, false, \ 739 "Verify all arguments to JNI calls") \ 740 \ 741 product(bool, UseFastJNIAccessors, true, \ 742 "Use optimized versions of Get<Primitive>Field") \ 743 \ 744 product(intx, MaxJNILocalCapacity, 65536, \ 745 "Maximum allowable local JNI handle capacity to " \ 746 "EnsureLocalCapacity() and PushLocalFrame(), " \ 747 "where <= 0 is unlimited, default: 65536") \ 748 range(min_intx, max_intx) \ 749 \ 750 product(bool, EagerXrunInit, false, \ 751 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 752 "but not all -Xrun libraries may support the state of the VM " \ 753 "at this time") \ 754 \ 755 product(bool, PreserveAllAnnotations, false, \ 756 "Preserve RuntimeInvisibleAnnotations as well " \ 757 "as RuntimeVisibleAnnotations") \ 758 \ 759 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 760 "Number of OutOfMemoryErrors preallocated with backtrace") \ 761 \ 762 product(bool, UseXMMForArrayCopy, false, \ 763 "Use SSE2 MOVQ instruction for Arraycopy") \ 764 \ 765 notproduct(bool, PrintFieldLayout, false, \ 766 "Print field layout for each class") \ 767 \ 768 /* Need to limit the extent of the padding to reasonable size. */\ 769 /* 8K is well beyond the reasonable HW cache line size, even with */\ 770 /* aggressive prefetching, while still leaving the room for segregating */\ 771 /* among the distinct pages. */\ 772 product(intx, ContendedPaddingWidth, 128, \ 773 "How many bytes to pad the fields/classes marked @Contended with")\ 774 range(0, 8192) \ 775 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 776 \ 777 product(bool, EnableContended, true, \ 778 "Enable @Contended annotation support") \ 779 \ 780 product(bool, RestrictContended, true, \ 781 "Restrict @Contended to trusted classes") \ 782 \ 783 product(bool, UseBiasedLocking, true, \ 784 "Enable biased locking in JVM") \ 785 \ 786 product(intx, BiasedLockingStartupDelay, 0, \ 787 "Number of milliseconds to wait before enabling biased locking") \ 788 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 789 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 790 \ 791 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 792 "Print statistics of biased locking in JVM") \ 793 \ 794 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 795 "Threshold of number of revocations per type to try to " \ 796 "rebias all objects in the heap of that type") \ 797 range(0, max_intx) \ 798 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 799 \ 800 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 801 "Threshold of number of revocations per type to permanently " \ 802 "revoke biases of all objects in the heap of that type") \ 803 range(0, max_intx) \ 804 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 805 \ 806 product(intx, BiasedLockingDecayTime, 25000, \ 807 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 808 "type after previous bulk rebias") \ 809 range(500, max_intx) \ 810 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 811 \ 812 product(bool, ExitOnOutOfMemoryError, false, \ 813 "JVM exits on the first occurrence of an out-of-memory error") \ 814 \ 815 product(bool, CrashOnOutOfMemoryError, false, \ 816 "JVM aborts, producing an error log and core/mini dump, on the " \ 817 "first occurrence of an out-of-memory error") \ 818 \ 819 /* tracing */ \ 820 \ 821 develop(bool, StressRewriter, false, \ 822 "Stress linktime bytecode rewriting") \ 823 \ 824 product(ccstr, TraceJVMTI, NULL, \ 825 "Trace flags for JVMTI functions and events") \ 826 \ 827 /* This option can change an EMCP method into an obsolete method. */ \ 828 /* This can affect tests that except specific methods to be EMCP. */ \ 829 /* This option should be used with caution. */ \ 830 product(bool, StressLdcRewrite, false, \ 831 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 832 \ 833 /* change to false by default sometime after Mustang */ \ 834 product(bool, VerifyMergedCPBytecodes, true, \ 835 "Verify bytecodes after RedefineClasses constant pool merging") \ 836 \ 837 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 838 "(Deprecated) Allow redefinition to add and delete private " \ 839 "static or final methods for compatibility with old releases") \ 840 \ 841 develop(bool, TraceBytecodes, false, \ 842 "Trace bytecode execution") \ 843 \ 844 develop(bool, TraceICs, false, \ 845 "Trace inline cache changes") \ 846 \ 847 notproduct(bool, TraceInvocationCounterOverflow, false, \ 848 "Trace method invocation counter overflow") \ 849 \ 850 develop(bool, TraceInlineCacheClearing, false, \ 851 "Trace clearing of inline caches in nmethods") \ 852 \ 853 develop(bool, TraceDependencies, false, \ 854 "Trace dependencies") \ 855 \ 856 develop(bool, VerifyDependencies, trueInDebug, \ 857 "Exercise and verify the compilation dependency mechanism") \ 858 \ 859 develop(bool, TraceNewOopMapGeneration, false, \ 860 "Trace OopMapGeneration") \ 861 \ 862 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 863 "Trace OopMapGeneration: print detailed cell states") \ 864 \ 865 develop(bool, TimeOopMap, false, \ 866 "Time calls to GenerateOopMap::compute_map() in sum") \ 867 \ 868 develop(bool, TimeOopMap2, false, \ 869 "Time calls to GenerateOopMap::compute_map() individually") \ 870 \ 871 develop(bool, TraceOopMapRewrites, false, \ 872 "Trace rewriting of method oops during oop map generation") \ 873 \ 874 develop(bool, TraceICBuffer, false, \ 875 "Trace usage of IC buffer") \ 876 \ 877 develop(bool, TraceCompiledIC, false, \ 878 "Trace changes of compiled IC") \ 879 \ 880 develop(bool, FLSVerifyDictionary, false, \ 881 "Do lots of (expensive) FLS dictionary verification") \ 882 \ 883 \ 884 notproduct(bool, CheckMemoryInitialization, false, \ 885 "Check memory initialization") \ 886 \ 887 product(uintx, ProcessDistributionStride, 4, \ 888 "Stride through processors when distributing processes") \ 889 range(0, max_juint) \ 890 \ 891 develop(bool, TraceFinalizerRegistration, false, \ 892 "Trace registration of final references") \ 893 \ 894 product(bool, IgnoreEmptyClassPaths, false, \ 895 "Ignore empty path elements in -classpath") \ 896 \ 897 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 898 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 899 "Initial size of the boot class loader data metaspace") \ 900 range(30*K, max_uintx/BytesPerWord) \ 901 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 902 \ 903 product(bool, PrintHeapAtSIGBREAK, true, \ 904 "Print heap layout in response to SIGBREAK") \ 905 \ 906 manageable(bool, PrintClassHistogram, false, \ 907 "Print a histogram of class instances") \ 908 \ 909 experimental(double, ObjectCountCutOffPercent, 0.5, \ 910 "The percentage of the used heap that the instances of a class " \ 911 "must occupy for the class to generate a trace event") \ 912 range(0.0, 100.0) \ 913 \ 914 /* JVMTI heap profiling */ \ 915 \ 916 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 917 "Trace JVMTI object tagging calls") \ 918 \ 919 diagnostic(bool, VerifyBeforeIteration, false, \ 920 "Verify memory system before JVMTI iteration") \ 921 \ 922 /* compiler interface */ \ 923 \ 924 develop(bool, CIPrintCompilerName, false, \ 925 "when CIPrint is active, print the name of the active compiler") \ 926 \ 927 diagnostic(bool, CIPrintCompileQueue, false, \ 928 "display the contents of the compile queue whenever a " \ 929 "compilation is enqueued") \ 930 \ 931 develop(bool, CIPrintRequests, false, \ 932 "display every request for compilation") \ 933 \ 934 product(bool, CITime, false, \ 935 "collect timing information for compilation") \ 936 \ 937 develop(bool, CITimeVerbose, false, \ 938 "be more verbose in compilation timings") \ 939 \ 940 develop(bool, CITimeEach, false, \ 941 "display timing information after each successful compilation") \ 942 \ 943 develop(bool, CICountOSR, false, \ 944 "use a separate counter when assigning ids to osr compilations") \ 945 \ 946 develop(bool, CICompileNatives, true, \ 947 "compile native methods if supported by the compiler") \ 948 \ 949 develop_pd(bool, CICompileOSR, \ 950 "compile on stack replacement methods if supported by the " \ 951 "compiler") \ 952 \ 953 develop(bool, CIPrintMethodCodes, false, \ 954 "print method bytecodes of the compiled code") \ 955 \ 956 develop(bool, CIPrintTypeFlow, false, \ 957 "print the results of ciTypeFlow analysis") \ 958 \ 959 develop(bool, CITraceTypeFlow, false, \ 960 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 961 \ 962 develop(intx, OSROnlyBCI, -1, \ 963 "OSR only at this bci. Negative values mean exclude that bci") \ 964 \ 965 /* compiler */ \ 966 \ 967 /* notice: the max range value here is max_jint, not max_intx */ \ 968 /* because of overflow issue */ \ 969 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 970 "Number of compiler threads to run") \ 971 range(0, max_jint) \ 972 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 973 \ 974 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 975 "Dynamically choose the number of parallel compiler threads") \ 976 \ 977 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 978 "Reduce the number of parallel compiler threads when they " \ 979 "are not used") \ 980 \ 981 diagnostic(bool, TraceCompilerThreads, false, \ 982 "Trace creation and removal of compiler threads") \ 983 \ 984 develop(bool, InjectCompilerCreationFailure, false, \ 985 "Inject thread creation failures for " \ 986 "UseDynamicNumberOfCompilerThreads") \ 987 \ 988 develop(bool, UseStackBanging, true, \ 989 "use stack banging for stack overflow checks (required for " \ 990 "proper StackOverflow handling; disable only to measure cost " \ 991 "of stackbanging)") \ 992 \ 993 develop(bool, GenerateSynchronizationCode, true, \ 994 "generate locking/unlocking code for synchronized methods and " \ 995 "monitors") \ 996 \ 997 develop(bool, GenerateRangeChecks, true, \ 998 "Generate range checks for array accesses") \ 999 \ 1000 diagnostic_pd(bool, ImplicitNullChecks, \ 1001 "Generate code for implicit null checks") \ 1002 \ 1003 product_pd(bool, TrapBasedNullChecks, \ 1004 "Generate code for null checks that uses a cmp and trap " \ 1005 "instruction raising SIGTRAP. This is only used if an access to" \ 1006 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1007 "ImplicitNullChecks don't work (PPC64).") \ 1008 \ 1009 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1010 "Enable Thread SMR extra validity checks") \ 1011 \ 1012 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1013 "Enable Thread SMR Statistics") \ 1014 \ 1015 product(bool, UseNotificationThread, true, \ 1016 "Use Notification Thread") \ 1017 \ 1018 product(bool, Inline, true, \ 1019 "Enable inlining") \ 1020 \ 1021 product(bool, ClipInlining, true, \ 1022 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1023 \ 1024 develop(bool, UseCHA, true, \ 1025 "Enable CHA") \ 1026 \ 1027 product(bool, UseTypeProfile, true, \ 1028 "Check interpreter profile for historically monomorphic calls") \ 1029 \ 1030 diagnostic(bool, PrintInlining, false, \ 1031 "Print inlining optimizations") \ 1032 \ 1033 product(bool, UsePopCountInstruction, false, \ 1034 "Use population count instruction") \ 1035 \ 1036 develop(bool, EagerInitialization, false, \ 1037 "Eagerly initialize classes if possible") \ 1038 \ 1039 diagnostic(bool, LogTouchedMethods, false, \ 1040 "Log methods which have been ever touched in runtime") \ 1041 \ 1042 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1043 "Print all methods that have been ever touched in runtime") \ 1044 \ 1045 develop(bool, TraceMethodReplacement, false, \ 1046 "Print when methods are replaced do to recompilation") \ 1047 \ 1048 develop(bool, PrintMethodFlushing, false, \ 1049 "Print the nmethods being flushed") \ 1050 \ 1051 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1052 "print statistics about method flushing") \ 1053 \ 1054 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1055 "Number of compiled code invocations after which " \ 1056 "the method is considered as hot by the flusher") \ 1057 range(1, max_jint) \ 1058 \ 1059 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1060 "Minimum number of sweeper passes before an nmethod " \ 1061 "can be flushed") \ 1062 range(0, max_intx) \ 1063 \ 1064 product(bool, UseCodeAging, true, \ 1065 "Insert counter to detect warm methods") \ 1066 \ 1067 diagnostic(bool, StressCodeAging, false, \ 1068 "Start with counters compiled in") \ 1069 \ 1070 develop(bool, StressCodeBuffers, false, \ 1071 "Exercise code buffer expansion and other rare state changes") \ 1072 \ 1073 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1074 "Generate extra debugging information for non-safepoints in " \ 1075 "nmethods") \ 1076 \ 1077 product(bool, PrintVMOptions, false, \ 1078 "Print flags that appeared on the command line") \ 1079 \ 1080 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1081 "Ignore unrecognized VM options") \ 1082 \ 1083 product(bool, PrintCommandLineFlags, false, \ 1084 "Print flags specified on command line or set by ergonomics") \ 1085 \ 1086 product(bool, PrintFlagsInitial, false, \ 1087 "Print all VM flags before argument processing and exit VM") \ 1088 \ 1089 product(bool, PrintFlagsFinal, false, \ 1090 "Print all VM flags after argument and ergonomic processing") \ 1091 \ 1092 notproduct(bool, PrintFlagsWithComments, false, \ 1093 "Print all VM flags with default values and descriptions and " \ 1094 "exit") \ 1095 \ 1096 product(bool, PrintFlagsRanges, false, \ 1097 "Print VM flags and their ranges") \ 1098 \ 1099 diagnostic(bool, SerializeVMOutput, true, \ 1100 "Use a mutex to serialize output to tty and LogFile") \ 1101 \ 1102 diagnostic(bool, DisplayVMOutput, true, \ 1103 "Display all VM output on the tty, independently of LogVMOutput") \ 1104 \ 1105 diagnostic(bool, LogVMOutput, false, \ 1106 "Save VM output to LogFile") \ 1107 \ 1108 diagnostic(ccstr, LogFile, NULL, \ 1109 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1110 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1111 \ 1112 product(ccstr, ErrorFile, NULL, \ 1113 "If an error occurs, save the error data to this file " \ 1114 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1115 \ 1116 product(bool, ExtensiveErrorReports, \ 1117 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1118 "Error reports are more extensive.") \ 1119 \ 1120 product(bool, DisplayVMOutputToStderr, false, \ 1121 "If DisplayVMOutput is true, display all VM output to stderr") \ 1122 \ 1123 product(bool, DisplayVMOutputToStdout, false, \ 1124 "If DisplayVMOutput is true, display all VM output to stdout") \ 1125 \ 1126 product(bool, ErrorFileToStderr, false, \ 1127 "If true, error data is printed to stderr instead of a file") \ 1128 \ 1129 product(bool, ErrorFileToStdout, false, \ 1130 "If true, error data is printed to stdout instead of a file") \ 1131 \ 1132 product(bool, UseHeavyMonitors, false, \ 1133 "use heavyweight instead of lightweight Java monitors") \ 1134 \ 1135 product(bool, PrintStringTableStatistics, false, \ 1136 "print statistics about the StringTable and SymbolTable") \ 1137 \ 1138 diagnostic(bool, VerifyStringTableAtExit, false, \ 1139 "verify StringTable contents at exit") \ 1140 \ 1141 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1142 "print histogram of the symbol table") \ 1143 \ 1144 notproduct(bool, ExitVMOnVerifyError, false, \ 1145 "standard exit from VM if bytecode verify error " \ 1146 "(only in debug mode)") \ 1147 \ 1148 diagnostic(ccstr, AbortVMOnException, NULL, \ 1149 "Call fatal if this exception is thrown. Example: " \ 1150 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1151 \ 1152 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1153 "Call fatal if the exception pointed by AbortVMOnException " \ 1154 "has this message") \ 1155 \ 1156 develop(bool, DebugVtables, false, \ 1157 "add debugging code to vtable dispatch") \ 1158 \ 1159 notproduct(bool, PrintVtableStats, false, \ 1160 "print vtables stats at end of run") \ 1161 \ 1162 develop(bool, TraceCreateZombies, false, \ 1163 "trace creation of zombie nmethods") \ 1164 \ 1165 product(bool, RangeCheckElimination, true, \ 1166 "Eliminate range checks") \ 1167 \ 1168 develop_pd(bool, UncommonNullCast, \ 1169 "track occurrences of null in casts; adjust compiler tactics") \ 1170 \ 1171 develop(bool, TypeProfileCasts, true, \ 1172 "treat casts like calls for purposes of type profiling") \ 1173 \ 1174 develop(bool, TraceLivenessGen, false, \ 1175 "Trace the generation of liveness analysis information") \ 1176 \ 1177 notproduct(bool, TraceLivenessQuery, false, \ 1178 "Trace queries of liveness analysis information") \ 1179 \ 1180 notproduct(bool, CollectIndexSetStatistics, false, \ 1181 "Collect information about IndexSets") \ 1182 \ 1183 develop(bool, UseLoopSafepoints, true, \ 1184 "Generate Safepoint nodes in every loop") \ 1185 \ 1186 develop(intx, FastAllocateSizeLimit, 128*K, \ 1187 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1188 "Inline allocations larger than this in doublewords must go slow")\ 1189 \ 1190 product_pd(bool, CompactStrings, \ 1191 "Enable Strings to use single byte chars in backing store") \ 1192 \ 1193 product_pd(uintx, TypeProfileLevel, \ 1194 "=XYZ, with Z: Type profiling of arguments at call; " \ 1195 "Y: Type profiling of return value at call; " \ 1196 "X: Type profiling of parameters to methods; " \ 1197 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1198 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1199 \ 1200 product(intx, TypeProfileArgsLimit, 2, \ 1201 "max number of call arguments to consider for type profiling") \ 1202 range(0, 16) \ 1203 \ 1204 product(intx, TypeProfileParmsLimit, 2, \ 1205 "max number of incoming parameters to consider for type profiling"\ 1206 ", -1 for all") \ 1207 range(-1, 64) \ 1208 \ 1209 /* statistics */ \ 1210 develop(bool, CountCompiledCalls, false, \ 1211 "Count method invocations") \ 1212 \ 1213 notproduct(bool, CountRuntimeCalls, false, \ 1214 "Count VM runtime calls") \ 1215 \ 1216 develop(bool, CountJNICalls, false, \ 1217 "Count jni method invocations") \ 1218 \ 1219 notproduct(bool, CountJVMCalls, false, \ 1220 "Count jvm method invocations") \ 1221 \ 1222 notproduct(bool, CountRemovableExceptions, false, \ 1223 "Count exceptions that could be replaced by branches due to " \ 1224 "inlining") \ 1225 \ 1226 notproduct(bool, ICMissHistogram, false, \ 1227 "Produce histogram of IC misses") \ 1228 \ 1229 /* interpreter */ \ 1230 product_pd(bool, RewriteBytecodes, \ 1231 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1232 \ 1233 product_pd(bool, RewriteFrequentPairs, \ 1234 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1235 \ 1236 diagnostic(bool, PrintInterpreter, false, \ 1237 "Print the generated interpreter code") \ 1238 \ 1239 product(bool, UseInterpreter, true, \ 1240 "Use interpreter for non-compiled methods") \ 1241 \ 1242 develop(bool, UseFastSignatureHandlers, true, \ 1243 "Use fast signature handlers for native calls") \ 1244 \ 1245 product(bool, UseLoopCounter, true, \ 1246 "Increment invocation counter on backward branch") \ 1247 \ 1248 product_pd(bool, UseOnStackReplacement, \ 1249 "Use on stack replacement, calls runtime if invoc. counter " \ 1250 "overflows in loop") \ 1251 \ 1252 notproduct(bool, TraceOnStackReplacement, false, \ 1253 "Trace on stack replacement") \ 1254 \ 1255 product_pd(bool, PreferInterpreterNativeStubs, \ 1256 "Use always interpreter stubs for native methods invoked via " \ 1257 "interpreter") \ 1258 \ 1259 develop(bool, CountBytecodes, false, \ 1260 "Count number of bytecodes executed") \ 1261 \ 1262 develop(bool, PrintBytecodeHistogram, false, \ 1263 "Print histogram of the executed bytecodes") \ 1264 \ 1265 develop(bool, PrintBytecodePairHistogram, false, \ 1266 "Print histogram of the executed bytecode pairs") \ 1267 \ 1268 diagnostic(bool, PrintSignatureHandlers, false, \ 1269 "Print code generated for native method signature handlers") \ 1270 \ 1271 develop(bool, VerifyOops, false, \ 1272 "Do plausibility checks for oops") \ 1273 \ 1274 develop(bool, CheckUnhandledOops, false, \ 1275 "Check for unhandled oops in VM code") \ 1276 \ 1277 develop(bool, VerifyJNIFields, trueInDebug, \ 1278 "Verify jfieldIDs for instance fields") \ 1279 \ 1280 notproduct(bool, VerifyJNIEnvThread, false, \ 1281 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1282 "from JNI") \ 1283 \ 1284 develop(bool, VerifyFPU, false, \ 1285 "Verify FPU state (check for NaN's, etc.)") \ 1286 \ 1287 develop(bool, VerifyThread, false, \ 1288 "Watch the thread register for corruption (SPARC only)") \ 1289 \ 1290 develop(bool, VerifyActivationFrameSize, false, \ 1291 "Verify that activation frame didn't become smaller than its " \ 1292 "minimal size") \ 1293 \ 1294 develop(bool, TraceFrequencyInlining, false, \ 1295 "Trace frequency based inlining") \ 1296 \ 1297 develop_pd(bool, InlineIntrinsics, \ 1298 "Inline intrinsics that can be statically resolved") \ 1299 \ 1300 product_pd(bool, ProfileInterpreter, \ 1301 "Profile at the bytecode level during interpretation") \ 1302 \ 1303 develop(bool, TraceProfileInterpreter, false, \ 1304 "Trace profiling at the bytecode level during interpretation. " \ 1305 "This outputs the profiling information collected to improve " \ 1306 "jit compilation.") \ 1307 \ 1308 develop_pd(bool, ProfileTraps, \ 1309 "Profile deoptimization traps at the bytecode level") \ 1310 \ 1311 product(intx, ProfileMaturityPercentage, 20, \ 1312 "number of method invocations/branches (expressed as % of " \ 1313 "CompileThreshold) before using the method's profile") \ 1314 range(0, 100) \ 1315 \ 1316 diagnostic(bool, PrintMethodData, false, \ 1317 "Print the results of +ProfileInterpreter at end of run") \ 1318 \ 1319 develop(bool, VerifyDataPointer, trueInDebug, \ 1320 "Verify the method data pointer during interpreter profiling") \ 1321 \ 1322 develop(bool, VerifyCompiledCode, false, \ 1323 "Include miscellaneous runtime verifications in nmethod code; " \ 1324 "default off because it disturbs nmethod size heuristics") \ 1325 \ 1326 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1327 "Manually make GC thread crash then dump java stack trace; " \ 1328 "Test only") \ 1329 \ 1330 /* compilation */ \ 1331 product(bool, UseCompiler, true, \ 1332 "Use Just-In-Time compilation") \ 1333 \ 1334 product(bool, UseCounterDecay, true, \ 1335 "Adjust recompilation counters") \ 1336 \ 1337 develop(intx, CounterHalfLifeTime, 30, \ 1338 "Half-life time of invocation counters (in seconds)") \ 1339 \ 1340 develop(intx, CounterDecayMinIntervalLength, 500, \ 1341 "The minimum interval (in milliseconds) between invocation of " \ 1342 "CounterDecay") \ 1343 \ 1344 product(bool, AlwaysCompileLoopMethods, false, \ 1345 "When using recompilation, never interpret methods " \ 1346 "containing loops") \ 1347 \ 1348 product(bool, DontCompileHugeMethods, true, \ 1349 "Do not compile methods > HugeMethodLimit") \ 1350 \ 1351 /* Bytecode escape analysis estimation. */ \ 1352 product(bool, EstimateArgEscape, true, \ 1353 "Analyze bytecodes to estimate escape state of arguments") \ 1354 \ 1355 product(intx, BCEATraceLevel, 0, \ 1356 "How much tracing to do of bytecode escape analysis estimates " \ 1357 "(0-3)") \ 1358 range(0, 3) \ 1359 \ 1360 product(intx, MaxBCEAEstimateLevel, 5, \ 1361 "Maximum number of nested calls that are analyzed by BC EA") \ 1362 range(0, max_jint) \ 1363 \ 1364 product(intx, MaxBCEAEstimateSize, 150, \ 1365 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1366 range(0, max_jint) \ 1367 \ 1368 product(intx, AllocatePrefetchStyle, 1, \ 1369 "0 = no prefetch, " \ 1370 "1 = generate prefetch instructions for each allocation, " \ 1371 "2 = use TLAB watermark to gate allocation prefetch, " \ 1372 "3 = generate one prefetch instruction per cache line") \ 1373 range(0, 3) \ 1374 \ 1375 product(intx, AllocatePrefetchDistance, -1, \ 1376 "Distance to prefetch ahead of allocation pointer. " \ 1377 "-1: use system-specific value (automatically determined") \ 1378 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\ 1379 \ 1380 product(intx, AllocatePrefetchLines, 3, \ 1381 "Number of lines to prefetch ahead of array allocation pointer") \ 1382 range(1, 64) \ 1383 \ 1384 product(intx, AllocateInstancePrefetchLines, 1, \ 1385 "Number of lines to prefetch ahead of instance allocation " \ 1386 "pointer") \ 1387 range(1, 64) \ 1388 \ 1389 product(intx, AllocatePrefetchStepSize, 16, \ 1390 "Step size in bytes of sequential prefetch instructions") \ 1391 range(1, 512) \ 1392 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1393 \ 1394 product(intx, AllocatePrefetchInstr, 0, \ 1395 "Select instruction to prefetch ahead of allocation pointer") \ 1396 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1397 \ 1398 /* deoptimization */ \ 1399 develop(bool, TraceDeoptimization, false, \ 1400 "Trace deoptimization") \ 1401 \ 1402 develop(bool, PrintDeoptimizationDetails, false, \ 1403 "Print more information about deoptimization") \ 1404 \ 1405 develop(bool, DebugDeoptimization, false, \ 1406 "Tracing various information while debugging deoptimization") \ 1407 \ 1408 product(intx, SelfDestructTimer, 0, \ 1409 "Will cause VM to terminate after a given time (in minutes) " \ 1410 "(0 means off)") \ 1411 range(0, max_intx) \ 1412 \ 1413 product(intx, MaxJavaStackTraceDepth, 1024, \ 1414 "The maximum number of lines in the stack trace for Java " \ 1415 "exceptions (0 means all)") \ 1416 range(0, max_jint/2) \ 1417 \ 1418 /* notice: the max range value here is max_jint, not max_intx */ \ 1419 /* because of overflow issue */ \ 1420 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1421 "Guarantee a safepoint (at least) every so many milliseconds " \ 1422 "(0 means none)") \ 1423 range(0, max_jint) \ 1424 \ 1425 product(intx, SafepointTimeoutDelay, 10000, \ 1426 "Delay in milliseconds for option SafepointTimeout") \ 1427 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1428 NOT_LP64(range(0, max_intx)) \ 1429 \ 1430 product(intx, NmethodSweepActivity, 10, \ 1431 "Removes cold nmethods from code cache if > 0. Higher values " \ 1432 "result in more aggressive sweeping") \ 1433 range(0, 2000) \ 1434 \ 1435 notproduct(bool, LogSweeper, false, \ 1436 "Keep a ring buffer of sweeper activity") \ 1437 \ 1438 notproduct(intx, SweeperLogEntries, 1024, \ 1439 "Number of records in the ring buffer of sweeper activity") \ 1440 \ 1441 notproduct(intx, MemProfilingInterval, 500, \ 1442 "Time between each invocation of the MemProfiler") \ 1443 \ 1444 develop(intx, MallocCatchPtr, -1, \ 1445 "Hit breakpoint when mallocing/freeing this pointer") \ 1446 \ 1447 notproduct(ccstrlist, SuppressErrorAt, "", \ 1448 "List of assertions (file:line) to muzzle") \ 1449 \ 1450 develop(intx, StackPrintLimit, 100, \ 1451 "number of stack frames to print in VM-level stack dump") \ 1452 \ 1453 notproduct(intx, MaxElementPrintSize, 256, \ 1454 "maximum number of elements to print") \ 1455 \ 1456 notproduct(intx, MaxSubklassPrintSize, 4, \ 1457 "maximum number of subklasses to print when printing klass") \ 1458 \ 1459 product(intx, MaxInlineLevel, 15, \ 1460 "maximum number of nested calls that are inlined") \ 1461 range(0, max_jint) \ 1462 \ 1463 product(intx, MaxRecursiveInlineLevel, 1, \ 1464 "maximum number of nested recursive calls that are inlined") \ 1465 range(0, max_jint) \ 1466 \ 1467 develop(intx, MaxForceInlineLevel, 100, \ 1468 "maximum number of nested calls that are forced for inlining " \ 1469 "(using CompileCommand or marked w/ @ForceInline)") \ 1470 range(0, max_jint) \ 1471 \ 1472 product_pd(intx, InlineSmallCode, \ 1473 "Only inline already compiled methods if their code size is " \ 1474 "less than this") \ 1475 range(0, max_jint) \ 1476 \ 1477 product(intx, MaxInlineSize, 35, \ 1478 "The maximum bytecode size of a method to be inlined") \ 1479 range(0, max_jint) \ 1480 \ 1481 product_pd(intx, FreqInlineSize, \ 1482 "The maximum bytecode size of a frequent method to be inlined") \ 1483 range(0, max_jint) \ 1484 \ 1485 product(intx, MaxTrivialSize, 6, \ 1486 "The maximum bytecode size of a trivial method to be inlined") \ 1487 range(0, max_jint) \ 1488 \ 1489 product(intx, MinInliningThreshold, 250, \ 1490 "The minimum invocation count a method needs to have to be " \ 1491 "inlined") \ 1492 range(0, max_jint) \ 1493 \ 1494 develop(intx, MethodHistogramCutoff, 100, \ 1495 "The cutoff value for method invocation histogram (+CountCalls)") \ 1496 \ 1497 develop(intx, DontYieldALotInterval, 10, \ 1498 "Interval between which yields will be dropped (milliseconds)") \ 1499 \ 1500 notproduct(intx, DeoptimizeALotInterval, 5, \ 1501 "Number of exits until DeoptimizeALot kicks in") \ 1502 \ 1503 notproduct(intx, ZombieALotInterval, 5, \ 1504 "Number of exits until ZombieALot kicks in") \ 1505 \ 1506 diagnostic(uintx, MallocMaxTestWords, 0, \ 1507 "If non-zero, maximum number of words that malloc/realloc can " \ 1508 "allocate (for testing only)") \ 1509 range(0, max_uintx) \ 1510 \ 1511 product(intx, TypeProfileWidth, 2, \ 1512 "Number of receiver types to record in call/cast profile") \ 1513 range(0, 8) \ 1514 \ 1515 develop(intx, BciProfileWidth, 2, \ 1516 "Number of return bci's to record in ret profile") \ 1517 \ 1518 product(intx, PerMethodRecompilationCutoff, 400, \ 1519 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1520 range(-1, max_intx) \ 1521 \ 1522 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1523 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1524 range(-1, max_intx) \ 1525 \ 1526 product(intx, PerMethodTrapLimit, 100, \ 1527 "Limit on traps (of one kind) in a method (includes inlines)") \ 1528 range(0, max_jint) \ 1529 \ 1530 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1531 "Limit on speculative traps (of one kind) in a method " \ 1532 "(includes inlines)") \ 1533 range(0, max_jint) \ 1534 \ 1535 product(intx, PerBytecodeTrapLimit, 4, \ 1536 "Limit on traps (of one kind) at a particular BCI") \ 1537 range(0, max_jint) \ 1538 \ 1539 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1540 "Extra method data trap entries for speculation") \ 1541 \ 1542 develop(intx, InlineFrequencyRatio, 20, \ 1543 "Ratio of call site execution to caller method invocation") \ 1544 range(0, max_jint) \ 1545 \ 1546 diagnostic_pd(intx, InlineFrequencyCount, \ 1547 "Count of call site execution necessary to trigger frequent " \ 1548 "inlining") \ 1549 range(0, max_jint) \ 1550 \ 1551 develop(intx, InlineThrowCount, 50, \ 1552 "Force inlining of interpreted methods that throw this often") \ 1553 range(0, max_jint) \ 1554 \ 1555 develop(intx, InlineThrowMaxSize, 200, \ 1556 "Force inlining of throwing methods smaller than this") \ 1557 range(0, max_jint) \ 1558 \ 1559 develop(intx, ProfilerNodeSize, 1024, \ 1560 "Size in K to allocate for the Profile Nodes of each thread") \ 1561 range(0, 1024) \ 1562 \ 1563 product_pd(size_t, MetaspaceSize, \ 1564 "Initial threshold (in bytes) at which a garbage collection " \ 1565 "is done to reduce Metaspace usage") \ 1566 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1567 \ 1568 product(size_t, MaxMetaspaceSize, max_uintx, \ 1569 "Maximum size of Metaspaces (in bytes)") \ 1570 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1571 \ 1572 product(size_t, CompressedClassSpaceSize, 1*G, \ 1573 "Maximum size of class area in Metaspace when compressed " \ 1574 "class pointers are used") \ 1575 range(1*M, 3*G) \ 1576 \ 1577 manageable(uintx, MinHeapFreeRatio, 40, \ 1578 "The minimum percentage of heap free after GC to avoid expansion."\ 1579 " For most GCs this applies to the old generation. In G1 and" \ 1580 " ParallelGC it applies to the whole heap.") \ 1581 range(0, 100) \ 1582 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1583 \ 1584 manageable(uintx, MaxHeapFreeRatio, 70, \ 1585 "The maximum percentage of heap free after GC to avoid shrinking."\ 1586 " For most GCs this applies to the old generation. In G1 and" \ 1587 " ParallelGC it applies to the whole heap.") \ 1588 range(0, 100) \ 1589 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1590 \ 1591 product(bool, ShrinkHeapInSteps, true, \ 1592 "When disabled, informs the GC to shrink the java heap directly" \ 1593 " to the target size at the next full GC rather than requiring" \ 1594 " smaller steps during multiple full GCs.") \ 1595 \ 1596 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1597 "Number of milliseconds per MB of free space in the heap") \ 1598 range(0, max_intx) \ 1599 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1600 \ 1601 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1602 "The minimum change in heap space due to GC (in bytes)") \ 1603 range(0, max_uintx) \ 1604 \ 1605 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1606 "The minimum expansion of Metaspace (in bytes)") \ 1607 range(0, max_uintx) \ 1608 \ 1609 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1610 "The maximum percentage of Metaspace free after GC to avoid " \ 1611 "shrinking") \ 1612 range(0, 100) \ 1613 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1614 \ 1615 product(uintx, MinMetaspaceFreeRatio, 40, \ 1616 "The minimum percentage of Metaspace free after GC to avoid " \ 1617 "expansion") \ 1618 range(0, 99) \ 1619 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1620 \ 1621 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1622 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1623 range(0, max_uintx) \ 1624 \ 1625 /* stack parameters */ \ 1626 product_pd(intx, StackYellowPages, \ 1627 "Number of yellow zone (recoverable overflows) pages of size " \ 1628 "4KB. If pages are bigger yellow zone is aligned up.") \ 1629 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1630 \ 1631 product_pd(intx, StackRedPages, \ 1632 "Number of red zone (unrecoverable overflows) pages of size " \ 1633 "4KB. If pages are bigger red zone is aligned up.") \ 1634 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1635 \ 1636 product_pd(intx, StackReservedPages, \ 1637 "Number of reserved zone (reserved to annotated methods) pages" \ 1638 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1639 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1640 \ 1641 product(bool, RestrictReservedStack, true, \ 1642 "Restrict @ReservedStackAccess to trusted classes") \ 1643 \ 1644 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1645 product_pd(intx, StackShadowPages, \ 1646 "Number of shadow zone (for overflow checking) pages of size " \ 1647 "4KB. If pages are bigger shadow zone is aligned up. " \ 1648 "This should exceed the depth of the VM and native call stack.") \ 1649 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1650 \ 1651 product_pd(intx, ThreadStackSize, \ 1652 "Thread Stack Size (in Kbytes)") \ 1653 range(0, 1 * M) \ 1654 \ 1655 product_pd(intx, VMThreadStackSize, \ 1656 "Non-Java Thread Stack Size (in Kbytes)") \ 1657 range(0, max_intx/(1 * K)) \ 1658 \ 1659 product_pd(intx, CompilerThreadStackSize, \ 1660 "Compiler Thread Stack Size (in Kbytes)") \ 1661 range(0, max_intx/(1 * K)) \ 1662 \ 1663 develop_pd(size_t, JVMInvokeMethodSlack, \ 1664 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1665 \ 1666 /* code cache parameters */ \ 1667 develop_pd(uintx, CodeCacheSegmentSize, \ 1668 "Code cache segment size (in bytes) - smallest unit of " \ 1669 "allocation") \ 1670 range(1, 1024) \ 1671 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1672 \ 1673 develop_pd(intx, CodeEntryAlignment, \ 1674 "Code entry alignment for generated code (in bytes)") \ 1675 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1676 \ 1677 product_pd(intx, OptoLoopAlignment, \ 1678 "Align inner loops to zero relative to this modulus") \ 1679 range(1, 16) \ 1680 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1681 \ 1682 product_pd(uintx, InitialCodeCacheSize, \ 1683 "Initial code cache size (in bytes)") \ 1684 range(os::vm_page_size(), max_uintx) \ 1685 \ 1686 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1687 "Minimum code cache size (in bytes) required to start VM.") \ 1688 range(0, max_uintx) \ 1689 \ 1690 product(bool, SegmentedCodeCache, false, \ 1691 "Use a segmented code cache") \ 1692 \ 1693 product_pd(uintx, ReservedCodeCacheSize, \ 1694 "Reserved code cache size (in bytes) - maximum code cache size") \ 1695 range(os::vm_page_size(), max_uintx) \ 1696 \ 1697 product_pd(uintx, NonProfiledCodeHeapSize, \ 1698 "Size of code heap with non-profiled methods (in bytes)") \ 1699 range(0, max_uintx) \ 1700 \ 1701 product_pd(uintx, ProfiledCodeHeapSize, \ 1702 "Size of code heap with profiled methods (in bytes)") \ 1703 range(0, max_uintx) \ 1704 \ 1705 product_pd(uintx, NonNMethodCodeHeapSize, \ 1706 "Size of code heap with non-nmethods (in bytes)") \ 1707 range(os::vm_page_size(), max_uintx) \ 1708 \ 1709 product_pd(uintx, CodeCacheExpansionSize, \ 1710 "Code cache expansion size (in bytes)") \ 1711 range(32*K, max_uintx) \ 1712 \ 1713 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1714 "Minimum number of segments in a code cache block") \ 1715 range(1, 100) \ 1716 \ 1717 notproduct(bool, ExitOnFullCodeCache, false, \ 1718 "Exit the VM if we fill the code cache") \ 1719 \ 1720 product(bool, UseCodeCacheFlushing, true, \ 1721 "Remove cold/old nmethods from the code cache") \ 1722 \ 1723 product(uintx, StartAggressiveSweepingAt, 10, \ 1724 "Start aggressive sweeping if X[%] of the code cache is free." \ 1725 "Segmented code cache: X[%] of the non-profiled heap." \ 1726 "Non-segmented code cache: X[%] of the total code cache") \ 1727 range(0, 100) \ 1728 \ 1729 /* AOT parameters */ \ 1730 experimental(bool, UseAOT, false, \ 1731 "Use AOT compiled files") \ 1732 \ 1733 experimental(ccstrlist, AOTLibrary, NULL, \ 1734 "AOT library") \ 1735 \ 1736 experimental(bool, PrintAOT, false, \ 1737 "Print used AOT klasses and methods") \ 1738 \ 1739 notproduct(bool, PrintAOTStatistics, false, \ 1740 "Print AOT statistics") \ 1741 \ 1742 diagnostic(bool, UseAOTStrictLoading, false, \ 1743 "Exit the VM if any of the AOT libraries has invalid config") \ 1744 \ 1745 product(bool, CalculateClassFingerprint, false, \ 1746 "Calculate class fingerprint") \ 1747 \ 1748 /* interpreter debugging */ \ 1749 develop(intx, BinarySwitchThreshold, 5, \ 1750 "Minimal number of lookupswitch entries for rewriting to binary " \ 1751 "switch") \ 1752 \ 1753 develop(intx, StopInterpreterAt, 0, \ 1754 "Stop interpreter execution at specified bytecode number") \ 1755 \ 1756 develop(intx, TraceBytecodesAt, 0, \ 1757 "Trace bytecodes starting with specified bytecode number") \ 1758 \ 1759 /* compiler interface */ \ 1760 develop(intx, CIStart, 0, \ 1761 "The id of the first compilation to permit") \ 1762 \ 1763 develop(intx, CIStop, max_jint, \ 1764 "The id of the last compilation to permit") \ 1765 \ 1766 develop(intx, CIStartOSR, 0, \ 1767 "The id of the first osr compilation to permit " \ 1768 "(CICountOSR must be on)") \ 1769 \ 1770 develop(intx, CIStopOSR, max_jint, \ 1771 "The id of the last osr compilation to permit " \ 1772 "(CICountOSR must be on)") \ 1773 \ 1774 develop(intx, CIBreakAtOSR, -1, \ 1775 "The id of osr compilation to break at") \ 1776 \ 1777 develop(intx, CIBreakAt, -1, \ 1778 "The id of compilation to break at") \ 1779 \ 1780 product(ccstrlist, CompileOnly, "", \ 1781 "List of methods (pkg/class.name) to restrict compilation to") \ 1782 \ 1783 product(ccstr, CompileCommandFile, NULL, \ 1784 "Read compiler commands from this file [.hotspot_compiler]") \ 1785 \ 1786 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1787 "Read compiler directives from this file") \ 1788 \ 1789 product(ccstrlist, CompileCommand, "", \ 1790 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1791 \ 1792 develop(bool, ReplayCompiles, false, \ 1793 "Enable replay of compilations from ReplayDataFile") \ 1794 \ 1795 product(ccstr, ReplayDataFile, NULL, \ 1796 "File containing compilation replay information" \ 1797 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1798 \ 1799 product(ccstr, InlineDataFile, NULL, \ 1800 "File containing inlining replay information" \ 1801 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1802 \ 1803 develop(intx, ReplaySuppressInitializers, 2, \ 1804 "Control handling of class initialization during replay: " \ 1805 "0 - don't do anything special; " \ 1806 "1 - treat all class initializers as empty; " \ 1807 "2 - treat class initializers for application classes as empty; " \ 1808 "3 - allow all class initializers to run during bootstrap but " \ 1809 " pretend they are empty after starting replay") \ 1810 range(0, 3) \ 1811 \ 1812 develop(bool, ReplayIgnoreInitErrors, false, \ 1813 "Ignore exceptions thrown during initialization for replay") \ 1814 \ 1815 product(bool, DumpReplayDataOnError, true, \ 1816 "Record replay data for crashing compiler threads") \ 1817 \ 1818 product(bool, CICompilerCountPerCPU, false, \ 1819 "1 compiler thread for log(N CPUs)") \ 1820 \ 1821 notproduct(intx, CICrashAt, -1, \ 1822 "id of compilation to trigger assert in compiler thread for " \ 1823 "the purpose of testing, e.g. generation of replay data") \ 1824 notproduct(bool, CIObjectFactoryVerify, false, \ 1825 "enable potentially expensive verification in ciObjectFactory") \ 1826 \ 1827 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1828 "Abort VM when method had failed to compile.") \ 1829 \ 1830 /* Priorities */ \ 1831 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1832 \ 1833 product(intx, ThreadPriorityPolicy, 0, \ 1834 "0 : Normal. "\ 1835 " VM chooses priorities that are appropriate for normal "\ 1836 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1837 " to normal native priority. Java priorities below " \ 1838 " NORM_PRIORITY map to lower native priority values. On "\ 1839 " Windows applications are allowed to use higher native "\ 1840 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1841 " not use the highest possible native priority, "\ 1842 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1843 " system threads. On Linux thread priorities are ignored "\ 1844 " because the OS does not support static priority in "\ 1845 " SCHED_OTHER scheduling class which is the only choice for "\ 1846 " non-root, non-realtime applications. "\ 1847 "1 : Aggressive. "\ 1848 " Java thread priorities map over to the entire range of "\ 1849 " native thread priorities. Higher Java thread priorities map "\ 1850 " to higher native thread priorities. This policy should be "\ 1851 " used with care, as sometimes it can cause performance "\ 1852 " degradation in the application and/or the entire system. On "\ 1853 " Linux/BSD/macOS this policy requires root privilege or an "\ 1854 " extended capability.") \ 1855 range(0, 1) \ 1856 \ 1857 product(bool, ThreadPriorityVerbose, false, \ 1858 "Print priority changes") \ 1859 \ 1860 product(intx, CompilerThreadPriority, -1, \ 1861 "The native priority at which compiler threads should run " \ 1862 "(-1 means no change)") \ 1863 range(min_jint, max_jint) \ 1864 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1865 \ 1866 product(intx, VMThreadPriority, -1, \ 1867 "The native priority at which the VM thread should run " \ 1868 "(-1 means no change)") \ 1869 range(-1, 127) \ 1870 \ 1871 product(intx, JavaPriority1_To_OSPriority, -1, \ 1872 "Map Java priorities to OS priorities") \ 1873 range(-1, 127) \ 1874 \ 1875 product(intx, JavaPriority2_To_OSPriority, -1, \ 1876 "Map Java priorities to OS priorities") \ 1877 range(-1, 127) \ 1878 \ 1879 product(intx, JavaPriority3_To_OSPriority, -1, \ 1880 "Map Java priorities to OS priorities") \ 1881 range(-1, 127) \ 1882 \ 1883 product(intx, JavaPriority4_To_OSPriority, -1, \ 1884 "Map Java priorities to OS priorities") \ 1885 range(-1, 127) \ 1886 \ 1887 product(intx, JavaPriority5_To_OSPriority, -1, \ 1888 "Map Java priorities to OS priorities") \ 1889 range(-1, 127) \ 1890 \ 1891 product(intx, JavaPriority6_To_OSPriority, -1, \ 1892 "Map Java priorities to OS priorities") \ 1893 range(-1, 127) \ 1894 \ 1895 product(intx, JavaPriority7_To_OSPriority, -1, \ 1896 "Map Java priorities to OS priorities") \ 1897 range(-1, 127) \ 1898 \ 1899 product(intx, JavaPriority8_To_OSPriority, -1, \ 1900 "Map Java priorities to OS priorities") \ 1901 range(-1, 127) \ 1902 \ 1903 product(intx, JavaPriority9_To_OSPriority, -1, \ 1904 "Map Java priorities to OS priorities") \ 1905 range(-1, 127) \ 1906 \ 1907 product(intx, JavaPriority10_To_OSPriority,-1, \ 1908 "Map Java priorities to OS priorities") \ 1909 range(-1, 127) \ 1910 \ 1911 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1912 "Java thread priority 10 maps to critical scheduling priority") \ 1913 \ 1914 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1915 "Compiler thread(s) run at critical scheduling priority") \ 1916 \ 1917 develop(intx, NewCodeParameter, 0, \ 1918 "Testing Only: Create a dedicated integer parameter before " \ 1919 "putback") \ 1920 \ 1921 /* new oopmap storage allocation */ \ 1922 develop(intx, MinOopMapAllocation, 8, \ 1923 "Minimum number of OopMap entries in an OopMapSet") \ 1924 \ 1925 /* Background Compilation */ \ 1926 develop(intx, LongCompileThreshold, 50, \ 1927 "Used with +TraceLongCompiles") \ 1928 \ 1929 /* recompilation */ \ 1930 product_pd(intx, CompileThreshold, \ 1931 "number of interpreted method invocations before (re-)compiling") \ 1932 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1933 \ 1934 product(double, CompileThresholdScaling, 1.0, \ 1935 "Factor to control when first compilation happens " \ 1936 "(both with and without tiered compilation): " \ 1937 "values greater than 1.0 delay counter overflow, " \ 1938 "values between 0 and 1.0 rush counter overflow, " \ 1939 "value of 1.0 leaves compilation thresholds unchanged " \ 1940 "value of 0.0 is equivalent to -Xint. " \ 1941 "" \ 1942 "Flag can be set as per-method option. " \ 1943 "If a value is specified for a method, compilation thresholds " \ 1944 "for that method are scaled by both the value of the global flag "\ 1945 "and the value of the per-method flag.") \ 1946 range(0.0, DBL_MAX) \ 1947 \ 1948 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1949 "Interpreter (tier 0) invocation notification frequency") \ 1950 range(0, 30) \ 1951 \ 1952 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 1953 "C1 without MDO (tier 2) invocation notification frequency") \ 1954 range(0, 30) \ 1955 \ 1956 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 1957 "C1 with MDO profiling (tier 3) invocation notification " \ 1958 "frequency") \ 1959 range(0, 30) \ 1960 \ 1961 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 1962 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 1963 range(0, 30) \ 1964 \ 1965 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 1966 "Interpreter (tier 0) invocation notification frequency") \ 1967 range(0, 30) \ 1968 \ 1969 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 1970 "C1 without MDO (tier 2) invocation notification frequency") \ 1971 range(0, 30) \ 1972 \ 1973 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 1974 "C1 with MDO profiling (tier 3) invocation notification " \ 1975 "frequency") \ 1976 range(0, 30) \ 1977 \ 1978 product(intx, Tier2CompileThreshold, 0, \ 1979 "threshold at which tier 2 compilation is invoked") \ 1980 range(0, max_jint) \ 1981 \ 1982 product(intx, Tier2BackEdgeThreshold, 0, \ 1983 "Back edge threshold at which tier 2 compilation is invoked") \ 1984 range(0, max_jint) \ 1985 \ 1986 product(intx, Tier3InvocationThreshold, 200, \ 1987 "Compile if number of method invocations crosses this " \ 1988 "threshold") \ 1989 range(0, max_jint) \ 1990 \ 1991 product(intx, Tier3MinInvocationThreshold, 100, \ 1992 "Minimum invocation to compile at tier 3") \ 1993 range(0, max_jint) \ 1994 \ 1995 product(intx, Tier3CompileThreshold, 2000, \ 1996 "Threshold at which tier 3 compilation is invoked (invocation " \ 1997 "minimum must be satisfied)") \ 1998 range(0, max_jint) \ 1999 \ 2000 product(intx, Tier3BackEdgeThreshold, 60000, \ 2001 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2002 range(0, max_jint) \ 2003 \ 2004 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2005 "Compile if number of method invocations crosses this " \ 2006 "threshold if coming from AOT") \ 2007 range(0, max_jint) \ 2008 \ 2009 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2010 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2011 range(0, max_jint) \ 2012 \ 2013 product(intx, Tier3AOTCompileThreshold, 15000, \ 2014 "Threshold at which tier 3 compilation is invoked (invocation " \ 2015 "minimum must be satisfied) if coming from AOT") \ 2016 range(0, max_jint) \ 2017 \ 2018 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2019 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2020 "if coming from AOT") \ 2021 range(0, max_jint) \ 2022 \ 2023 diagnostic(intx, Tier0AOTInvocationThreshold, 200, \ 2024 "Switch to interpreter to profile if the number of method " \ 2025 "invocations crosses this threshold if coming from AOT " \ 2026 "(applicable only with " \ 2027 "CompilationMode=high-only|high-only-quick-internal)") \ 2028 range(0, max_jint) \ 2029 \ 2030 diagnostic(intx, Tier0AOTMinInvocationThreshold, 100, \ 2031 "Minimum number of invocations to switch to interpreter " \ 2032 "to profile if coming from AOT " \ 2033 "(applicable only with " \ 2034 "CompilationMode=high-only|high-only-quick-internal)") \ 2035 range(0, max_jint) \ 2036 \ 2037 diagnostic(intx, Tier0AOTCompileThreshold, 2000, \ 2038 "Threshold at which to switch to interpreter to profile " \ 2039 "if coming from AOT " \ 2040 "(invocation minimum must be satisfied, " \ 2041 "applicable only with " \ 2042 "CompilationMode=high-only|high-only-quick-internal)") \ 2043 range(0, max_jint) \ 2044 \ 2045 diagnostic(intx, Tier0AOTBackEdgeThreshold, 60000, \ 2046 "Back edge threshold at which to switch to interpreter " \ 2047 "to profile if coming from AOT " \ 2048 "(applicable only with " \ 2049 "CompilationMode=high-only|high-only-quick-internal)") \ 2050 range(0, max_jint) \ 2051 \ 2052 product(intx, Tier4InvocationThreshold, 5000, \ 2053 "Compile if number of method invocations crosses this " \ 2054 "threshold") \ 2055 range(0, max_jint) \ 2056 \ 2057 product(intx, Tier4MinInvocationThreshold, 600, \ 2058 "Minimum invocation to compile at tier 4") \ 2059 range(0, max_jint) \ 2060 \ 2061 product(intx, Tier4CompileThreshold, 15000, \ 2062 "Threshold at which tier 4 compilation is invoked (invocation " \ 2063 "minimum must be satisfied)") \ 2064 range(0, max_jint) \ 2065 \ 2066 product(intx, Tier4BackEdgeThreshold, 40000, \ 2067 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2068 range(0, max_jint) \ 2069 \ 2070 diagnostic(intx, Tier40InvocationThreshold, 5000, \ 2071 "Compile if number of method invocations crosses this " \ 2072 "threshold (applicable only with " \ 2073 "CompilationMode=high-only|high-only-quick-internal)") \ 2074 range(0, max_jint) \ 2075 \ 2076 diagnostic(intx, Tier40MinInvocationThreshold, 600, \ 2077 "Minimum number of invocations to compile at tier 4 " \ 2078 "(applicable only with " \ 2079 "CompilationMode=high-only|high-only-quick-internal)") \ 2080 range(0, max_jint) \ 2081 \ 2082 diagnostic(intx, Tier40CompileThreshold, 10000, \ 2083 "Threshold at which tier 4 compilation is invoked (invocation " \ 2084 "minimum must be satisfied, applicable only with " \ 2085 "CompilationMode=high-only|high-only-quick-internal)") \ 2086 range(0, max_jint) \ 2087 \ 2088 diagnostic(intx, Tier40BackEdgeThreshold, 15000, \ 2089 "Back edge threshold at which tier 4 OSR compilation is invoked " \ 2090 "(applicable only with " \ 2091 "CompilationMode=high-only|high-only-quick-internal)") \ 2092 range(0, max_jint) \ 2093 \ 2094 diagnostic(intx, Tier0Delay, 5, \ 2095 "If C2 queue size grows over this amount per compiler thread " \ 2096 "do not start profiling in the interpreter " \ 2097 "(applicable only with " \ 2098 "CompilationMode=high-only|high-only-quick-internal)") \ 2099 range(0, max_jint) \ 2100 \ 2101 product(intx, Tier3DelayOn, 5, \ 2102 "If C2 queue size grows over this amount per compiler thread " \ 2103 "stop compiling at tier 3 and start compiling at tier 2") \ 2104 range(0, max_jint) \ 2105 \ 2106 product(intx, Tier3DelayOff, 2, \ 2107 "If C2 queue size is less than this amount per compiler thread " \ 2108 "allow methods compiled at tier 2 transition to tier 3") \ 2109 range(0, max_jint) \ 2110 \ 2111 product(intx, Tier3LoadFeedback, 5, \ 2112 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2113 "reaches this amount per compiler thread") \ 2114 range(0, max_jint) \ 2115 \ 2116 product(intx, Tier4LoadFeedback, 3, \ 2117 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2118 "reaches this amount per compiler thread") \ 2119 range(0, max_jint) \ 2120 \ 2121 product(intx, TieredCompileTaskTimeout, 50, \ 2122 "Kill compile task if method was not used within " \ 2123 "given timeout in milliseconds") \ 2124 range(0, max_intx) \ 2125 \ 2126 product(intx, TieredStopAtLevel, 4, \ 2127 "Stop at given compilation level") \ 2128 range(0, 4) \ 2129 \ 2130 product(intx, Tier0ProfilingStartPercentage, 200, \ 2131 "Start profiling in interpreter if the counters exceed tier 3 " \ 2132 "thresholds (tier 4 thresholds with " \ 2133 "CompilationMode=high-only|high-only-quick-internal)" \ 2134 "by the specified percentage") \ 2135 range(0, max_jint) \ 2136 \ 2137 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2138 "Increase the compile threshold for C1 compilation if the code " \ 2139 "cache is filled by the specified percentage") \ 2140 range(0, 99) \ 2141 \ 2142 product(intx, TieredRateUpdateMinTime, 1, \ 2143 "Minimum rate sampling interval (in milliseconds)") \ 2144 range(0, max_intx) \ 2145 \ 2146 product(intx, TieredRateUpdateMaxTime, 25, \ 2147 "Maximum rate sampling interval (in milliseconds)") \ 2148 range(0, max_intx) \ 2149 \ 2150 product(ccstr, CompilationMode, "default", \ 2151 "Compilation modes: " \ 2152 "default: normal tiered compilation; " \ 2153 "quick-only: C1-only mode; " \ 2154 "high-only: C2/JVMCI-only mode; " \ 2155 "high-only-quick-internal: C2/JVMCI-only mode, " \ 2156 "with JVMCI compiler compiled with C1.") \ 2157 \ 2158 product_pd(bool, TieredCompilation, \ 2159 "Enable tiered compilation") \ 2160 \ 2161 product(bool, PrintTieredEvents, false, \ 2162 "Print tiered events notifications") \ 2163 \ 2164 product_pd(intx, OnStackReplacePercentage, \ 2165 "NON_TIERED number of method invocations/branches (expressed as " \ 2166 "% of CompileThreshold) before (re-)compiling OSR code") \ 2167 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2168 \ 2169 product(intx, InterpreterProfilePercentage, 33, \ 2170 "NON_TIERED number of method invocations/branches (expressed as " \ 2171 "% of CompileThreshold) before profiling in the interpreter") \ 2172 range(0, 100) \ 2173 \ 2174 develop(intx, DesiredMethodLimit, 8000, \ 2175 "The desired maximum method size (in bytecodes) after inlining") \ 2176 \ 2177 develop(intx, HugeMethodLimit, 8000, \ 2178 "Don't compile methods larger than this if " \ 2179 "+DontCompileHugeMethods") \ 2180 \ 2181 /* Properties for Java libraries */ \ 2182 \ 2183 product(uint64_t, MaxDirectMemorySize, 0, \ 2184 "Maximum total size of NIO direct-buffer allocations") \ 2185 range(0, max_jlong) \ 2186 \ 2187 /* Flags used for temporary code during development */ \ 2188 \ 2189 diagnostic(bool, UseNewCode, false, \ 2190 "Testing Only: Use the new version while testing") \ 2191 \ 2192 diagnostic(bool, UseNewCode2, false, \ 2193 "Testing Only: Use the new version while testing") \ 2194 \ 2195 diagnostic(bool, UseNewCode3, false, \ 2196 "Testing Only: Use the new version while testing") \ 2197 \ 2198 /* flags for performance data collection */ \ 2199 \ 2200 product(bool, UsePerfData, true, \ 2201 "Flag to disable jvmstat instrumentation for performance testing "\ 2202 "and problem isolation purposes") \ 2203 \ 2204 product(bool, PerfDataSaveToFile, false, \ 2205 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2206 \ 2207 product(ccstr, PerfDataSaveFile, NULL, \ 2208 "Save PerfData memory to the specified absolute pathname. " \ 2209 "The string %p in the file name (if present) " \ 2210 "will be replaced by pid") \ 2211 \ 2212 product(intx, PerfDataSamplingInterval, 50, \ 2213 "Data sampling interval (in milliseconds)") \ 2214 range(PeriodicTask::min_interval, max_jint) \ 2215 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2216 \ 2217 product(bool, PerfDisableSharedMem, false, \ 2218 "Store performance data in standard memory") \ 2219 \ 2220 product(intx, PerfDataMemorySize, 32*K, \ 2221 "Size of performance data memory region. Will be rounded " \ 2222 "up to a multiple of the native os page size.") \ 2223 range(128, 32*64*K) \ 2224 \ 2225 product(intx, PerfMaxStringConstLength, 1024, \ 2226 "Maximum PerfStringConstant string length before truncation") \ 2227 range(32, 32*K) \ 2228 \ 2229 product(bool, PerfAllowAtExitRegistration, false, \ 2230 "Allow registration of atexit() methods") \ 2231 \ 2232 product(bool, PerfBypassFileSystemCheck, false, \ 2233 "Bypass Win32 file system criteria checks (Windows Only)") \ 2234 \ 2235 product(intx, UnguardOnExecutionViolation, 0, \ 2236 "Unguard page and retry on no-execute fault (Win32 only) " \ 2237 "0=off, 1=conservative, 2=aggressive") \ 2238 range(0, 2) \ 2239 \ 2240 /* Serviceability Support */ \ 2241 \ 2242 product(bool, ManagementServer, false, \ 2243 "Create JMX Management Server") \ 2244 \ 2245 product(bool, DisableAttachMechanism, false, \ 2246 "Disable mechanism that allows tools to attach to this VM") \ 2247 \ 2248 product(bool, StartAttachListener, false, \ 2249 "Always start Attach Listener at VM startup") \ 2250 \ 2251 product(bool, EnableDynamicAgentLoading, true, \ 2252 "Allow tools to load agents with the attach mechanism") \ 2253 \ 2254 manageable(bool, PrintConcurrentLocks, false, \ 2255 "Print java.util.concurrent locks in thread dump") \ 2256 \ 2257 /* Shared spaces */ \ 2258 \ 2259 product(bool, UseSharedSpaces, true, \ 2260 "Use shared spaces for metadata") \ 2261 \ 2262 product(bool, VerifySharedSpaces, false, \ 2263 "Verify integrity of shared spaces") \ 2264 \ 2265 product(bool, RequireSharedSpaces, false, \ 2266 "Require shared spaces for metadata") \ 2267 \ 2268 product(bool, DumpSharedSpaces, false, \ 2269 "Special mode: JVM reads a class list, loads classes, builds " \ 2270 "shared spaces, and dumps the shared spaces to a file to be " \ 2271 "used in future JVM runs") \ 2272 \ 2273 product(bool, DynamicDumpSharedSpaces, false, \ 2274 "Dynamic archive") \ 2275 \ 2276 product(bool, PrintSharedArchiveAndExit, false, \ 2277 "Print shared archive file contents") \ 2278 \ 2279 product(bool, PrintSharedDictionary, false, \ 2280 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2281 "dictionary") \ 2282 \ 2283 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2284 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2285 "Address to allocate shared memory region for class data") \ 2286 range(0, SIZE_MAX) \ 2287 \ 2288 product(ccstr, SharedArchiveConfigFile, NULL, \ 2289 "Data to add to the CDS archive file") \ 2290 \ 2291 product(uintx, SharedSymbolTableBucketSize, 4, \ 2292 "Average number of symbols per bucket in shared table") \ 2293 range(2, 246) \ 2294 \ 2295 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2296 "Allow Java agent to be run with CDS dumping") \ 2297 \ 2298 diagnostic(bool, PrintMethodHandleStubs, false, \ 2299 "Print generated stub code for method handles") \ 2300 \ 2301 develop(bool, TraceMethodHandles, false, \ 2302 "trace internal method handle operations") \ 2303 \ 2304 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2305 "perform extra checks when constructing method handles") \ 2306 \ 2307 diagnostic(bool, ShowHiddenFrames, false, \ 2308 "show method handle implementation frames (usually hidden)") \ 2309 \ 2310 experimental(bool, TrustFinalNonStaticFields, false, \ 2311 "trust final non-static declarations for constant folding") \ 2312 \ 2313 diagnostic(bool, FoldStableValues, true, \ 2314 "Optimize loads from stable fields (marked w/ @Stable)") \ 2315 \ 2316 develop(bool, TraceInvokeDynamic, false, \ 2317 "trace internal invoke dynamic operations") \ 2318 \ 2319 diagnostic(int, UseBootstrapCallInfo, 1, \ 2320 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2321 "resolved before the bootstrap method is called; 1: when a BSM " \ 2322 "that may accept a BootstrapCallInfo is detected, use that API " \ 2323 "to pass BSM arguments, which allows the BSM to delay their " \ 2324 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2325 "via that API, instead of with the eagerly-resolved array.") \ 2326 \ 2327 diagnostic(bool, PauseAtStartup, false, \ 2328 "Causes the VM to pause at startup time and wait for the pause " \ 2329 "file to be removed (default: ./vm.paused.<pid>)") \ 2330 \ 2331 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2332 "The file to create and for whose removal to await when pausing " \ 2333 "at startup. (default: ./vm.paused.<pid>)") \ 2334 \ 2335 diagnostic(bool, PauseAtExit, false, \ 2336 "Pause and wait for keypress on exit if a debugger is attached") \ 2337 \ 2338 product(bool, ExtendedDTraceProbes, false, \ 2339 "Enable performance-impacting dtrace probes") \ 2340 \ 2341 product(bool, DTraceMethodProbes, false, \ 2342 "Enable dtrace probes for method-entry and method-exit") \ 2343 \ 2344 product(bool, DTraceAllocProbes, false, \ 2345 "Enable dtrace probes for object allocation") \ 2346 \ 2347 product(bool, DTraceMonitorProbes, false, \ 2348 "Enable dtrace probes for monitor events") \ 2349 \ 2350 product(bool, RelaxAccessControlCheck, false, \ 2351 "Relax the access control checks in the verifier") \ 2352 \ 2353 product(uintx, StringTableSize, defaultStringTableSize, \ 2354 "Number of buckets in the interned String table " \ 2355 "(will be rounded to nearest higher power of 2)") \ 2356 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 2357 \ 2358 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2359 "Number of buckets in the JVM internal Symbol table") \ 2360 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 2361 \ 2362 product(bool, UseStringDeduplication, false, \ 2363 "Use string deduplication") \ 2364 \ 2365 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2366 "A string must reach this age (or be promoted to an old region) " \ 2367 "to be considered for deduplication") \ 2368 range(1, markWord::max_age) \ 2369 \ 2370 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2371 "Force table resize every time the table is scanned") \ 2372 \ 2373 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2374 "Force table rehash every time the table is scanned") \ 2375 \ 2376 diagnostic(bool, WhiteBoxAPI, false, \ 2377 "Enable internal testing APIs") \ 2378 \ 2379 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2380 "Default survivor space alignment in bytes") \ 2381 range(8, 256) \ 2382 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2383 \ 2384 product(ccstr, DumpLoadedClassList, NULL, \ 2385 "Dump the names all loaded classes, that could be stored into " \ 2386 "the CDS archive, in the specified file") \ 2387 \ 2388 product(ccstr, SharedClassListFile, NULL, \ 2389 "Override the default CDS class list") \ 2390 \ 2391 product(ccstr, SharedArchiveFile, NULL, \ 2392 "Override the default location of the CDS archive file") \ 2393 \ 2394 product(ccstr, ArchiveClassesAtExit, NULL, \ 2395 "The path and name of the dynamic archive file") \ 2396 \ 2397 product(ccstr, ExtraSharedClassListFile, NULL, \ 2398 "Extra classlist for building the CDS archive file") \ 2399 \ 2400 diagnostic(intx, ArchiveRelocationMode, 0, \ 2401 "(0) first map at preferred address, and if " \ 2402 "unsuccessful, map at alternative address (default); " \ 2403 "(1) always map at alternative address; " \ 2404 "(2) always map at preferred address, and if unsuccessful, " \ 2405 "do not map the archive") \ 2406 range(0, 2) \ 2407 \ 2408 experimental(size_t, ArrayAllocatorMallocLimit, \ 2409 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2410 "Allocation less than this value will be allocated " \ 2411 "using malloc. Larger allocations will use mmap.") \ 2412 \ 2413 experimental(bool, AlwaysAtomicAccesses, false, \ 2414 "Accesses to all variables should always be atomic") \ 2415 \ 2416 diagnostic(bool, UseUnalignedAccesses, false, \ 2417 "Use unaligned memory accesses in Unsafe") \ 2418 \ 2419 product_pd(bool, PreserveFramePointer, \ 2420 "Use the FP register for holding the frame pointer " \ 2421 "and not as a general purpose register.") \ 2422 \ 2423 diagnostic(bool, CheckIntrinsics, true, \ 2424 "When a class C is loaded, check that " \ 2425 "(1) all intrinsics defined by the VM for class C are present "\ 2426 "in the loaded class file and are marked with the " \ 2427 "@HotSpotIntrinsicCandidate annotation, that " \ 2428 "(2) there is an intrinsic registered for all loaded methods " \ 2429 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2430 "annotation, and that " \ 2431 "(3) no orphan methods exist for class C (i.e., methods for " \ 2432 "which the VM declares an intrinsic but that are not declared "\ 2433 "in the loaded class C. " \ 2434 "Check (3) is available only in debug builds.") \ 2435 \ 2436 diagnostic_pd(intx, InitArrayShortSize, \ 2437 "Threshold small size (in bytes) for clearing arrays. " \ 2438 "Anything this size or smaller may get converted to discrete " \ 2439 "scalar stores.") \ 2440 range(0, max_intx) \ 2441 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2442 \ 2443 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2444 "Disable backwards compatibility for compile commands.") \ 2445 \ 2446 diagnostic(bool, CompilerDirectivesPrint, false, \ 2447 "Print compiler directives on installation.") \ 2448 diagnostic(int, CompilerDirectivesLimit, 50, \ 2449 "Limit on number of compiler directives.") \ 2450 \ 2451 product(ccstr, AllocateHeapAt, NULL, \ 2452 "Path to the directoy where a temporary file will be created " \ 2453 "to use as the backing store for Java Heap.") \ 2454 \ 2455 experimental(ccstr, AllocateOldGenAt, NULL, \ 2456 "Path to the directoy where a temporary file will be " \ 2457 "created to use as the backing store for old generation." \ 2458 "File of size Xmx is pre-allocated for performance reason, so" \ 2459 "we need that much space available") \ 2460 \ 2461 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2462 "Run periodic metaspace verifications (0 - none, " \ 2463 "1 - always, >1 every nth interval)") \ 2464 \ 2465 diagnostic(bool, ShowRegistersOnAssert, true, \ 2466 "On internal errors, include registers in error report.") \ 2467 \ 2468 diagnostic(bool, UseSwitchProfiling, true, \ 2469 "leverage profiling for table/lookup switch") \ 2470 \ 2471 develop(bool, TraceMemoryWriteback, false, \ 2472 "Trace memory writeback operations") \ 2473 \ 2474 JFR_ONLY(product(bool, FlightRecorder, false, \ 2475 "(Deprecated) Enable Flight Recorder")) \ 2476 \ 2477 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2478 "Flight Recorder options")) \ 2479 \ 2480 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2481 "Start flight recording with options")) \ 2482 \ 2483 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2484 "Use platform unstable time where supported for timestamps only") \ 2485 \ 2486 product(bool, UseNewFieldLayout, true, \ 2487 "(Deprecated) Use new algorithm to compute field layouts") \ 2488 \ 2489 product(bool, UseEmptySlotsInSupers, true, \ 2490 "Allow allocating fields in empty slots of super-classes") \ 2491 \ 2492 2493 2494 // Interface macros 2495 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2496 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2497 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2498 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2499 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2500 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2501 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2502 #ifdef PRODUCT 2503 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2504 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2505 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2506 #else 2507 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2508 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2509 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2510 #endif // PRODUCT 2511 // Special LP64 flags, product only needed for now. 2512 #ifdef _LP64 2513 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2514 #else 2515 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2516 #endif // _LP64 2517 2518 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2519 DECLARE_PD_DEVELOPER_FLAG, \ 2520 DECLARE_PRODUCT_FLAG, \ 2521 DECLARE_PD_PRODUCT_FLAG, \ 2522 DECLARE_DIAGNOSTIC_FLAG, \ 2523 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2524 DECLARE_EXPERIMENTAL_FLAG, \ 2525 DECLARE_NOTPRODUCT_FLAG, \ 2526 DECLARE_MANAGEABLE_FLAG, \ 2527 DECLARE_PRODUCT_RW_FLAG, \ 2528 DECLARE_LP64_PRODUCT_FLAG, \ 2529 IGNORE_RANGE, \ 2530 IGNORE_CONSTRAINT) 2531 2532 #endif // SHARE_RUNTIME_GLOBALS_HPP | 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/flags/jvmFlagConstraintsCompiler.hpp" 31 #include "runtime/flags/jvmFlagConstraintsRuntime.hpp" 32 #include "runtime/globals_shared.hpp" 33 #include "utilities/align.hpp" 34 #include "utilities/globalDefinitions.hpp" 35 #include "utilities/macros.hpp" 36 #include CPU_HEADER(globals) 37 #include OS_HEADER(globals) 38 #include OS_CPU_HEADER(globals) 39 40 // Command-line flag specification in HotSpot is divided into individual modules. 41 // Each module should have 2 files in the module's directory. For example, C2 has the 42 // following 2 files: 43 // 44 // c2_globals.hpp - specification of all flags for C2, including meta-information 45 // such as docs, range and constraints. 46 // c2_globals.cpp - definitions of the C++ variables that implements these flags. 47 // 48 // 49 // In the xxx_globals.hpp file, each flag must be specified with one of the 50 // following 5 macros. 51 // 52 // Platform-Independent Flags -- each flag has 5 arguments: (type, name, default_value, attr, docs) 53 // 54 // PRODUCT_FLAG -- always settable 55 // DEVELOP_FLAG -- settable only during development and are constant in the PRODUCT version 56 // NOTPROD_FLAG -- settable only during development and are *not* declared in the PRODUCT version 57 // 58 // Platform-Dependent Flags -- each flag has 4 arguments: (type, name, attr, docs) 59 // 60 // PRODUCT_FLAG_PD 61 // DEVELOP_FLAG_PD 62 // 63 // type: A flag must be declared with one of the following types: 64 // bool, int, uint, intx, uintx, size_t, ccstr, ccstr, double, or uint64_t. 65 // 66 // The type "ccstr" is an alias for "const char*" because the macrology 67 // requires single-token type names. For this type, you can optionally 68 // set the JVMFlag::STRINGLIST bit in the <attr> argument. This allows you 69 // to specify the flag multiple times on the command-line to build 70 // a string list. These flags are printed as "ccstrlist" by -XX:PrintFlagsFinal. 71 // 72 // name: The name of the flag. 73 // 74 // default_value: The default value of the flag. 75 // Note that the default values for the _PD flags are declared in 76 // platform-dependent header files such as cpu/x86/c2_globals_x86.hpp 77 // 78 // attr: See discussion below on flag attributes 79 // 80 // docs: Description of the flag. This is mostly for the benefits of HotSpot 81 // developers, and is excluded from PRODUCT builds. 82 // 83 // 84 // Optionally, a flag can be given a range and/or constraint by using the following 85 // macros: 86 // 87 // FLAG_RANGE(name, min, max) 88 // FLAG_CONSTRAINT(name, func, phase) 89 // 90 // When a range is specified, the flag's attr must include JVMFlag::RANGE. 91 // When a constraint is specified, the flag's attr must include JVMFlag::CONSTRAINT. 92 // 93 // For example: 94 // 95 // PRODUCT_FLAG(size_t, LargePageSizeInBytes, 0, JVMFlag::RANGE, 96 // "Large page size (0 to let VM choose the page size)"); 97 // FLAG_RANGE( LargePageSizeInBytes, 0, max_uintx); 98 // 99 // PRODUCT_FLAG_PD(size_t,MetaspaceSize, JVMFlag::CONSTRAINT, 100 // "Initial threshold (in bytes) at which a garbage collection " 101 // "is done to reduce Metaspace usage"); 102 // FLAG_CONSTRAINT( MetaspaceSize, (void*)MetaspaceSizeConstraintFunc, JVMFlag::AfterErgo); 103 // 104 // 105 // Command-line Flag Attributes 106 // 107 // The <attr> argument for each flag may be any combination of the following 108 // bits. 109 // 110 // JVMFlag::MANAGEABLE 111 // JVMFlag::DIAGNOSTIC 112 // JVMFlag::EXPERIMENTAL 113 // 114 // DIAGNOSTIC options are not meant for VM tuning or for product modes. 115 // They are to be used for VM quality assurance or field diagnosis 116 // of VM bugs. They are hidden so that users will not be encouraged to 117 // try them as if they were VM ordinary execution options. However, they 118 // are available in the product version of the VM. Under instruction 119 // from support engineers, VM customers can turn them on to collect 120 // diagnostic information about VM problems. To use a VM diagnostic 121 // option, you must first specify +UnlockDiagnosticVMOptions. 122 // (This master switch also affects the behavior of -Xprintflags.) 123 // 124 // EXPERIMENTAL flags are in support of features that are not 125 // part of the officially supported product, but are available 126 // for experimenting with. They could, for example, be performance 127 // features that may not have undergone full or rigorous QA, but which may 128 // help performance in some cases and released for experimentation 129 // by the community of users and developers. This flag also allows one to 130 // be able to build a fully supported product that nonetheless also 131 // ships with some unsupported, lightly tested, experimental features. 132 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 133 // UnlockExperimentalVMOptions flag, which allows the control and 134 // modification of the experimental flags. 135 // 136 // Nota bene: neither diagnostic nor experimental options should be used casually, 137 // and they are not supported on production loads, except under explicit 138 // direction from support engineers. 139 // 140 // MANAGEABLE flags are writeable external product flags. 141 // They are dynamically writeable through the JDK management interface 142 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 143 // These flags are external exported interface (see CCC). The list of 144 // manageable flags can be queried programmatically through the management 145 // interface. 146 // 147 // A flag can be made as "manageable" only if 148 // - the flag is defined in a CCC as an external exported interface. 149 // - the VM implementation supports dynamic setting of the flag. 150 // This implies that the VM must *always* query the flag variable 151 // and not reuse state related to the flag state at any given time. 152 // - you want the flag to be queried programmatically by the customers. 153 154 155 // Additional flag attributes 156 // 157 // In addition to the 3 bits described above, more can be specified. These 158 // usually only affects the printing of the flag (see java -XX:PrintFlagsFinal). 159 // However, you can also write code to process a certain group of 160 // flags. See JVMCIGlobals::check_jvmci_flags_are_consistent() for an example. 161 // 162 // JVMFlag::PLATFORM_DEPENDENT 163 // JVMFlag::C1 164 // JVMFlag::C2 165 // JVMFlag::ARCH 166 // JVMFlag::JVMCI 167 // 168 // To add these extra bits to a group of flags, you can use the FLAG_COMMON_ATTRS 169 // macro. See c2_globals.cpp for an example. 170 171 172 // Default and minimum StringTable and SymbolTable size values 173 // Must be powers of 2 174 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 175 const size_t minimumStringTableSize = 128; 176 const size_t defaultSymbolTableSize = 32768; // 2^15 177 const size_t minimumSymbolTableSize = 1024; 178 179 #include "runtime/flags/jvmFlag.hpp" 180 NOTPROD_FLAG(bool, CheckCompressedOops, true, JVMFlag::DEFAULT, 181 "Generate checks in encoding/decoding code in debug VM"); 182 183 PRODUCT_FLAG(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), JVMFlag::RANGE, 184 "Heap allocation steps through preferred address regions to find" 185 " where it can allocate the heap. Number of steps to take per " 186 "region."); 187 FLAG_RANGE( HeapSearchSteps, 1, max_uintx); 188 189 DEVELOP_FLAG(bool, CleanChunkPoolAsync, true, JVMFlag::DEFAULT, 190 "Clean the chunk pool asynchronously"); 191 192 PRODUCT_FLAG(uint, HandshakeTimeout, 0, JVMFlag::DIAGNOSTIC, 193 "If nonzero set a timeout in milliseconds for handshakes"); 194 195 PRODUCT_FLAG(bool, AlwaysSafeConstructors, false, JVMFlag::EXPERIMENTAL, 196 "Force safe construction, as if all fields are final."); 197 198 PRODUCT_FLAG(bool, UnlockDiagnosticVMOptions, trueInDebug, JVMFlag::DIAGNOSTIC, 199 "Enable normal processing of flags relating to field diagnostics"); 200 201 PRODUCT_FLAG(bool, UnlockExperimentalVMOptions, false, JVMFlag::EXPERIMENTAL, 202 "Enable normal processing of flags relating to experimental " 203 "features"); 204 205 PRODUCT_FLAG(bool, JavaMonitorsInStackTrace, true, JVMFlag::DEFAULT, 206 "Print information about Java monitor locks when the stacks are" 207 "dumped"); 208 209 PRODUCT_FLAG_PD(bool, UseLargePages, JVMFlag::DEFAULT, 210 "Use large page memory"); 211 212 PRODUCT_FLAG_PD(bool, UseLargePagesIndividualAllocation, JVMFlag::DEFAULT, 213 "Allocate large pages individually for better affinity"); 214 215 DEVELOP_FLAG(bool, LargePagesIndividualAllocationInjectError, false, JVMFlag::DEFAULT, 216 "Fail large pages individual allocation"); 217 218 PRODUCT_FLAG(bool, UseLargePagesInMetaspace, false, JVMFlag::DEFAULT, 219 "Use large page memory in metaspace. " 220 "Only used if UseLargePages is enabled."); 221 222 PRODUCT_FLAG(bool, UseNUMA, false, JVMFlag::DEFAULT, 223 "Use NUMA if available"); 224 225 PRODUCT_FLAG(bool, UseNUMAInterleaving, false, JVMFlag::DEFAULT, 226 "Interleave memory across NUMA nodes if available"); 227 228 PRODUCT_FLAG(size_t, NUMAInterleaveGranularity, 2*M, JVMFlag::RANGE, 229 "Granularity to use for NUMA interleaving on Windows OS"); 230 FLAG_CUSTOM_RANGE( NUMAInterleaveGranularity, VMAllocationGranularity); 231 232 PRODUCT_FLAG(bool, ForceNUMA, false, JVMFlag::DEFAULT, 233 "Force NUMA optimizations on single-node/UMA systems"); 234 235 PRODUCT_FLAG(uintx, NUMAChunkResizeWeight, 20, JVMFlag::RANGE, 236 "Percentage (0-100) used to weight the current sample when " 237 "computing exponentially decaying average for " 238 "AdaptiveNUMAChunkSizing"); 239 FLAG_RANGE( NUMAChunkResizeWeight, 0, 100); 240 241 PRODUCT_FLAG(size_t, NUMASpaceResizeRate, 1*G, JVMFlag::RANGE, 242 "Do not reallocate more than this amount per collection"); 243 FLAG_RANGE( NUMASpaceResizeRate, 0, max_uintx); 244 245 PRODUCT_FLAG(bool, UseAdaptiveNUMAChunkSizing, true, JVMFlag::DEFAULT, 246 "Enable adaptive chunk sizing for NUMA"); 247 248 PRODUCT_FLAG(bool, NUMAStats, false, JVMFlag::DEFAULT, 249 "Print NUMA stats in detailed heap information"); 250 251 PRODUCT_FLAG(uintx, NUMAPageScanRate, 256, JVMFlag::RANGE, 252 "Maximum number of pages to include in the page scan procedure"); 253 FLAG_RANGE( NUMAPageScanRate, 0, max_uintx); 254 255 PRODUCT_FLAG(bool, UseAES, false, JVMFlag::DEFAULT, 256 "Control whether AES instructions are used when available"); 257 258 PRODUCT_FLAG(bool, UseFMA, false, JVMFlag::DEFAULT, 259 "Control whether FMA instructions are used when available"); 260 261 PRODUCT_FLAG(bool, UseSHA, false, JVMFlag::DEFAULT, 262 "Control whether SHA instructions are used when available"); 263 264 PRODUCT_FLAG(bool, UseGHASHIntrinsics, false, JVMFlag::DIAGNOSTIC, 265 "Use intrinsics for GHASH versions of crypto"); 266 267 PRODUCT_FLAG(bool, UseBASE64Intrinsics, false, JVMFlag::DEFAULT, 268 "Use intrinsics for java.util.Base64"); 269 270 PRODUCT_FLAG(size_t, LargePageSizeInBytes, 0, JVMFlag::RANGE, 271 "Large page size (0 to let VM choose the page size)"); 272 FLAG_RANGE( LargePageSizeInBytes, 0, max_uintx); 273 274 PRODUCT_FLAG(size_t, LargePageHeapSizeThreshold, 128*M, JVMFlag::RANGE, 275 "Use large pages if maximum heap is at least this big"); 276 FLAG_RANGE( LargePageHeapSizeThreshold, 0, max_uintx); 277 278 PRODUCT_FLAG(bool, ForceTimeHighResolution, false, JVMFlag::DEFAULT, 279 "Using high time resolution (for Win32 only)"); 280 281 DEVELOP_FLAG(bool, TracePcPatching, false, JVMFlag::DEFAULT, 282 "Trace usage of frame::patch_pc"); 283 284 DEVELOP_FLAG(bool, TraceRelocator, false, JVMFlag::DEFAULT, 285 "Trace the bytecode relocator"); 286 287 DEVELOP_FLAG(bool, TraceLongCompiles, false, JVMFlag::DEFAULT, 288 "Print out every time compilation is longer than " 289 "a given threshold"); 290 291 PRODUCT_FLAG(bool, SafepointALot, false, JVMFlag::DIAGNOSTIC, 292 "Generate a lot of safepoints. This works with " 293 "GuaranteedSafepointInterval"); 294 295 PRODUCT_FLAG(bool, HandshakeALot, false, JVMFlag::DIAGNOSTIC, 296 "Generate a lot of handshakes. This works with " 297 "GuaranteedSafepointInterval"); 298 299 PRODUCT_FLAG_PD(bool, BackgroundCompilation, JVMFlag::DEFAULT, 300 "A thread requesting compilation is not blocked during " 301 "compilation"); 302 303 PRODUCT_FLAG(bool, PrintVMQWaitTime, false, JVMFlag::DEFAULT, 304 "(Deprecated) Print out the waiting time in VM operation queue"); 305 306 PRODUCT_FLAG(bool, MethodFlushing, true, JVMFlag::DEFAULT, 307 "Reclamation of zombie and not-entrant methods"); 308 309 DEVELOP_FLAG(bool, VerifyStack, false, JVMFlag::DEFAULT, 310 "Verify stack of each thread when it is entering a runtime call"); 311 312 PRODUCT_FLAG(bool, ForceUnreachable, false, JVMFlag::DIAGNOSTIC, 313 "Make all non code cache addresses to be unreachable by " 314 "forcing use of 64bit literal fixups"); 315 316 NOTPROD_FLAG(bool, StressDerivedPointers, false, JVMFlag::DEFAULT, 317 "Force scavenge when a derived pointer is detected on stack " 318 "after rtm call"); 319 320 DEVELOP_FLAG(bool, TraceDerivedPointers, false, JVMFlag::DEFAULT, 321 "Trace traversal of derived pointers on stack"); 322 323 NOTPROD_FLAG(bool, TraceCodeBlobStacks, false, JVMFlag::DEFAULT, 324 "Trace stack-walk of codeblobs"); 325 326 NOTPROD_FLAG(bool, PrintRewrites, false, JVMFlag::DEFAULT, 327 "Print methods that are being rewritten"); 328 329 PRODUCT_FLAG(bool, UseInlineCaches, true, JVMFlag::DEFAULT, 330 "Use Inline Caches for virtual calls "); 331 332 PRODUCT_FLAG(bool, InlineArrayCopy, true, JVMFlag::DIAGNOSTIC, 333 "Inline arraycopy native that is known to be part of " 334 "base library DLL"); 335 336 PRODUCT_FLAG(bool, InlineObjectHash, true, JVMFlag::DIAGNOSTIC, 337 "Inline Object::hashCode() native that is known to be part " 338 "of base library DLL"); 339 340 PRODUCT_FLAG(bool, InlineNatives, true, JVMFlag::DIAGNOSTIC, 341 "Inline natives that are known to be part of base library DLL"); 342 343 PRODUCT_FLAG(bool, InlineMathNatives, true, JVMFlag::DIAGNOSTIC, 344 "Inline SinD, CosD, etc."); 345 346 PRODUCT_FLAG(bool, InlineClassNatives, true, JVMFlag::DIAGNOSTIC, 347 "Inline Class.isInstance, etc"); 348 349 PRODUCT_FLAG(bool, InlineThreadNatives, true, JVMFlag::DIAGNOSTIC, 350 "Inline Thread.currentThread, etc"); 351 352 PRODUCT_FLAG(bool, InlineUnsafeOps, true, JVMFlag::DIAGNOSTIC, 353 "Inline memory ops (native methods) from Unsafe"); 354 355 PRODUCT_FLAG(bool, CriticalJNINatives, true, JVMFlag::DEFAULT, 356 "Check for critical JNI entry points"); 357 358 NOTPROD_FLAG(bool, StressCriticalJNINatives, false, JVMFlag::DEFAULT, 359 "Exercise register saving code in critical natives"); 360 361 PRODUCT_FLAG(bool, UseAESIntrinsics, false, JVMFlag::DIAGNOSTIC, 362 "Use intrinsics for AES versions of crypto"); 363 364 PRODUCT_FLAG(bool, UseAESCTRIntrinsics, false, JVMFlag::DIAGNOSTIC, 365 "Use intrinsics for the paralleled version of AES/CTR crypto"); 366 367 PRODUCT_FLAG(bool, UseSHA1Intrinsics, false, JVMFlag::DIAGNOSTIC, 368 "Use intrinsics for SHA-1 crypto hash function. " 369 "Requires that UseSHA is enabled."); 370 371 PRODUCT_FLAG(bool, UseSHA256Intrinsics, false, JVMFlag::DIAGNOSTIC, 372 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " 373 "Requires that UseSHA is enabled."); 374 375 PRODUCT_FLAG(bool, UseSHA512Intrinsics, false, JVMFlag::DIAGNOSTIC, 376 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " 377 "Requires that UseSHA is enabled."); 378 379 PRODUCT_FLAG(bool, UseCRC32Intrinsics, false, JVMFlag::DIAGNOSTIC, 380 "use intrinsics for java.util.zip.CRC32"); 381 382 PRODUCT_FLAG(bool, UseCRC32CIntrinsics, false, JVMFlag::DIAGNOSTIC, 383 "use intrinsics for java.util.zip.CRC32C"); 384 385 PRODUCT_FLAG(bool, UseAdler32Intrinsics, false, JVMFlag::DIAGNOSTIC, 386 "use intrinsics for java.util.zip.Adler32"); 387 388 PRODUCT_FLAG(bool, UseVectorizedMismatchIntrinsic, false, JVMFlag::DIAGNOSTIC, 389 "Enables intrinsification of ArraysSupport.vectorizedMismatch()"); 390 391 PRODUCT_FLAG(ccstr, DisableIntrinsic, "", JVMFlag::DIAGNOSTIC | JVMFlag::STRINGLIST, 392 "do not expand intrinsics whose (internal) names appear here"); 393 394 DEVELOP_FLAG(bool, TraceCallFixup, false, JVMFlag::DEFAULT, 395 "Trace all call fixups"); 396 397 DEVELOP_FLAG(bool, DeoptimizeALot, false, JVMFlag::DEFAULT, 398 "Deoptimize at every exit from the runtime system"); 399 400 NOTPROD_FLAG(ccstr, DeoptimizeOnlyAt, "", JVMFlag::STRINGLIST, 401 "A comma separated list of bcis to deoptimize at"); 402 403 DEVELOP_FLAG(bool, DeoptimizeRandom, false, JVMFlag::DEFAULT, 404 "Deoptimize random frames on random exit from the runtime system"); 405 406 NOTPROD_FLAG(bool, ZombieALot, false, JVMFlag::DEFAULT, 407 "Create zombies (non-entrant) at exit from the runtime system"); 408 409 NOTPROD_FLAG(bool, WalkStackALot, false, JVMFlag::DEFAULT, 410 "Trace stack (no print) at every exit from the runtime system"); 411 412 PRODUCT_FLAG(bool, Debugging, false, JVMFlag::DEFAULT, 413 "Set when executing debug methods in debug.cpp " 414 "(to prevent triggering assertions)"); 415 416 NOTPROD_FLAG(bool, VerifyLastFrame, false, JVMFlag::DEFAULT, 417 "Verify oops on last frame on entry to VM"); 418 419 PRODUCT_FLAG(bool, SafepointTimeout, false, JVMFlag::DEFAULT, 420 "Time out and warn or fail after SafepointTimeoutDelay " 421 "milliseconds if failed to reach safepoint"); 422 423 PRODUCT_FLAG(bool, AbortVMOnSafepointTimeout, false, JVMFlag::DIAGNOSTIC, 424 "Abort upon failure to reach safepoint (see SafepointTimeout)"); 425 426 PRODUCT_FLAG(bool, AbortVMOnVMOperationTimeout, false, JVMFlag::DIAGNOSTIC, 427 "Abort upon failure to complete VM operation promptly"); 428 429 PRODUCT_FLAG(intx, AbortVMOnVMOperationTimeoutDelay, 1000, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 430 "Delay in milliseconds for option AbortVMOnVMOperationTimeout"); 431 FLAG_RANGE( AbortVMOnVMOperationTimeoutDelay, 0, max_intx); 432 433 434 // 50 retries * (5 * current_retry_count) millis = ~6.375 seconds 435 // typically, at most a few retries are needed 436 PRODUCT_FLAG(intx, SuspendRetryCount, 50, JVMFlag::RANGE, 437 "Maximum retry count for an external suspend request"); 438 FLAG_RANGE( SuspendRetryCount, 0, max_intx); 439 440 PRODUCT_FLAG(intx, SuspendRetryDelay, 5, JVMFlag::RANGE, 441 "Milliseconds to delay per retry (* current_retry_count)"); 442 FLAG_RANGE( SuspendRetryDelay, 0, max_intx); 443 444 PRODUCT_FLAG(bool, AssertOnSuspendWaitFailure, false, JVMFlag::DEFAULT, 445 "Assert/Guarantee on external suspend wait failure"); 446 447 PRODUCT_FLAG(bool, TraceSuspendWaitFailures, false, JVMFlag::DEFAULT, 448 "Trace external suspend wait failures"); 449 450 PRODUCT_FLAG(bool, MaxFDLimit, true, JVMFlag::DEFAULT, 451 "Bump the number of file descriptors to maximum in Solaris"); 452 453 PRODUCT_FLAG(bool, LogEvents, true, JVMFlag::DIAGNOSTIC, 454 "Enable the various ring buffer event logs"); 455 456 PRODUCT_FLAG(uintx, LogEventsBufferEntries, 20, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 457 "Number of ring buffer event logs"); 458 FLAG_RANGE( LogEventsBufferEntries, 1, NOT_LP64(1*K) LP64_ONLY(1*M)); 459 460 PRODUCT_FLAG(bool, BytecodeVerificationRemote, true, JVMFlag::DIAGNOSTIC, 461 "Enable the Java bytecode verifier for remote classes"); 462 463 PRODUCT_FLAG(bool, BytecodeVerificationLocal, false, JVMFlag::DIAGNOSTIC, 464 "Enable the Java bytecode verifier for local classes"); 465 466 DEVELOP_FLAG(bool, ForceFloatExceptions, trueInDebug, JVMFlag::DEFAULT, 467 "Force exceptions on FP stack under/overflow"); 468 469 DEVELOP_FLAG(bool, VerifyStackAtCalls, false, JVMFlag::DEFAULT, 470 "Verify that the stack pointer is unchanged after calls"); 471 472 DEVELOP_FLAG(bool, TraceJavaAssertions, false, JVMFlag::DEFAULT, 473 "Trace java language assertions"); 474 475 NOTPROD_FLAG(bool, VerifyCodeCache, false, JVMFlag::DEFAULT, 476 "Verify code cache on memory allocation/deallocation"); 477 478 DEVELOP_FLAG(bool, UseMallocOnly, false, JVMFlag::DEFAULT, 479 "Use only malloc/free for allocation (no resource area/arena)"); 480 481 DEVELOP_FLAG(bool, ZapResourceArea, trueInDebug, JVMFlag::DEFAULT, 482 "Zap freed resource/arena space with 0xABABABAB"); 483 484 NOTPROD_FLAG(bool, ZapVMHandleArea, trueInDebug, JVMFlag::DEFAULT, 485 "Zap freed VM handle space with 0xBCBCBCBC"); 486 487 NOTPROD_FLAG(bool, ZapStackSegments, trueInDebug, JVMFlag::DEFAULT, 488 "Zap allocated/freed stack segments with 0xFADFADED"); 489 490 DEVELOP_FLAG(bool, ZapUnusedHeapArea, trueInDebug, JVMFlag::DEFAULT, 491 "Zap unused heap space with 0xBAADBABE"); 492 493 DEVELOP_FLAG(bool, CheckZapUnusedHeapArea, false, JVMFlag::DEFAULT, 494 "Check zapping of unused heap space"); 495 496 DEVELOP_FLAG(bool, ZapFillerObjects, trueInDebug, JVMFlag::DEFAULT, 497 "Zap filler objects with 0xDEAFBABE"); 498 499 DEVELOP_FLAG(bool, PrintVMMessages, true, JVMFlag::DEFAULT, 500 "Print VM messages on console"); 501 502 NOTPROD_FLAG(uintx, ErrorHandlerTest, 0, JVMFlag::DEFAULT, 503 "If > 0, provokes an error after VM initialization; the value " 504 "determines which error to provoke. See test_error_handler() " 505 "in vmError.cpp."); 506 507 NOTPROD_FLAG(uintx, TestCrashInErrorHandler, 0, JVMFlag::DEFAULT, 508 "If > 0, provokes an error inside VM error handler (a secondary " 509 "crash). see test_error_handler() in vmError.cpp"); 510 511 NOTPROD_FLAG(bool, TestSafeFetchInErrorHandler, false, JVMFlag::DEFAULT, 512 "If true, tests SafeFetch inside error handler."); 513 514 DEVELOP_FLAG(bool, TestUnresponsiveErrorHandler, false, JVMFlag::DEFAULT, 515 "If true, simulates an unresponsive error handler."); 516 517 DEVELOP_FLAG(bool, Verbose, false, JVMFlag::DEFAULT, 518 "Print additional debugging information from other modes"); 519 520 DEVELOP_FLAG(bool, PrintMiscellaneous, false, JVMFlag::DEFAULT, 521 "Print uncategorized debugging information (requires +Verbose)"); 522 523 DEVELOP_FLAG(bool, WizardMode, false, JVMFlag::DEFAULT, 524 "Print much more debugging information"); 525 526 PRODUCT_FLAG(bool, ShowMessageBoxOnError, false, JVMFlag::DEFAULT, 527 "Keep process alive on VM fatal error"); 528 529 PRODUCT_FLAG(bool, CreateCoredumpOnCrash, true, JVMFlag::DEFAULT, 530 "Create core/mini dump on VM fatal error"); 531 532 PRODUCT_FLAG(uint64_t, ErrorLogTimeout, 2 * 60, JVMFlag::RANGE, 533 "Timeout, in seconds, to limit the time spent on writing an " 534 "error log in case of a crash."); 535 FLAG_RANGE( ErrorLogTimeout, 0, (uint64_t)max_jlong/1000); 536 537 PRODUCT_FLAG_PD(bool, UseOSErrorReporting, JVMFlag::DEFAULT, 538 "Let VM fatal error propagate to the OS (ie. WER on Windows)"); 539 540 PRODUCT_FLAG(bool, SuppressFatalErrorMessage, false, JVMFlag::DEFAULT, 541 "Report NO fatal error message (avoid deadlock)"); 542 543 PRODUCT_FLAG(ccstr, OnError, "", JVMFlag::STRINGLIST, 544 "Run user-defined commands on fatal error; see VMError.cpp " 545 "for examples"); 546 547 PRODUCT_FLAG(ccstr, OnOutOfMemoryError, "", JVMFlag::STRINGLIST, 548 "Run user-defined commands on first java.lang.OutOfMemoryError"); 549 550 PRODUCT_FLAG(bool, HeapDumpBeforeFullGC, false, JVMFlag::MANAGEABLE, 551 "Dump heap to file before any major stop-the-world GC"); 552 553 PRODUCT_FLAG(bool, HeapDumpAfterFullGC, false, JVMFlag::MANAGEABLE, 554 "Dump heap to file after any major stop-the-world GC"); 555 556 PRODUCT_FLAG(bool, HeapDumpOnOutOfMemoryError, false, JVMFlag::MANAGEABLE, 557 "Dump heap to file when java.lang.OutOfMemoryError is thrown"); 558 559 PRODUCT_FLAG(ccstr, HeapDumpPath, NULL, JVMFlag::MANAGEABLE, 560 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " 561 "directory) of the dump file (defaults to java_pid<pid>.hprof " 562 "in the working directory)"); 563 564 DEVELOP_FLAG(bool, BreakAtWarning, false, JVMFlag::DEFAULT, 565 "Execute breakpoint upon encountering VM warning"); 566 567 PRODUCT_FLAG(ccstr, NativeMemoryTracking, "off", JVMFlag::DEFAULT, 568 "Native memory tracking options"); 569 570 PRODUCT_FLAG(bool, PrintNMTStatistics, false, JVMFlag::DIAGNOSTIC, 571 "Print native memory tracking summary data if it is on"); 572 573 PRODUCT_FLAG(bool, LogCompilation, false, JVMFlag::DIAGNOSTIC, 574 "Log compilation activity in detail to LogFile"); 575 576 PRODUCT_FLAG(bool, PrintCompilation, false, JVMFlag::DEFAULT, 577 "Print compilations"); 578 579 PRODUCT_FLAG(bool, PrintExtendedThreadInfo, false, JVMFlag::DEFAULT, 580 "Print more information in thread dump"); 581 582 PRODUCT_FLAG(intx, ScavengeRootsInCode, 2, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 583 "0: do not allow scavengable oops in the code cache; " 584 "1: allow scavenging from the code cache; " 585 "2: emit as many constants as the compiler can see"); 586 FLAG_RANGE( ScavengeRootsInCode, 0, 2); 587 588 PRODUCT_FLAG(bool, AlwaysRestoreFPU, false, JVMFlag::DEFAULT, 589 "Restore the FPU control word after every JNI call (expensive)"); 590 591 PRODUCT_FLAG(bool, PrintCompilation2, false, JVMFlag::DIAGNOSTIC, 592 "Print additional statistics per compilation"); 593 594 PRODUCT_FLAG(bool, PrintAdapterHandlers, false, JVMFlag::DIAGNOSTIC, 595 "Print code generated for i2c/c2i adapters"); 596 597 PRODUCT_FLAG(bool, VerifyAdapterCalls, trueInDebug, JVMFlag::DIAGNOSTIC, 598 "Verify that i2c/c2i adapters are called properly"); 599 600 DEVELOP_FLAG(bool, VerifyAdapterSharing, false, JVMFlag::DEFAULT, 601 "Verify that the code for shared adapters is the equivalent"); 602 603 PRODUCT_FLAG(bool, PrintAssembly, false, JVMFlag::DIAGNOSTIC, 604 "Print assembly code (using external disassembler.so)"); 605 606 PRODUCT_FLAG(ccstr, PrintAssemblyOptions, NULL, JVMFlag::DIAGNOSTIC, 607 "Print options string passed to disassembler.so"); 608 609 NOTPROD_FLAG(bool, PrintNMethodStatistics, false, JVMFlag::DEFAULT, 610 "Print a summary statistic for the generated nmethods"); 611 612 PRODUCT_FLAG(bool, PrintNMethods, false, JVMFlag::DIAGNOSTIC, 613 "Print assembly code for nmethods when generated"); 614 615 PRODUCT_FLAG(bool, PrintNativeNMethods, false, JVMFlag::DIAGNOSTIC, 616 "Print assembly code for native nmethods when generated"); 617 618 DEVELOP_FLAG(bool, PrintDebugInfo, false, JVMFlag::DEFAULT, 619 "Print debug information for all nmethods when generated"); 620 621 DEVELOP_FLAG(bool, PrintRelocations, false, JVMFlag::DEFAULT, 622 "Print relocation information for all nmethods when generated"); 623 624 DEVELOP_FLAG(bool, PrintDependencies, false, JVMFlag::DEFAULT, 625 "Print dependency information for all nmethods when generated"); 626 627 DEVELOP_FLAG(bool, PrintExceptionHandlers, false, JVMFlag::DEFAULT, 628 "Print exception handler tables for all nmethods when generated"); 629 630 DEVELOP_FLAG(bool, StressCompiledExceptionHandlers, false, JVMFlag::DEFAULT, 631 "Exercise compiled exception handlers"); 632 633 DEVELOP_FLAG(bool, InterceptOSException, false, JVMFlag::DEFAULT, 634 "Start debugger when an implicit OS (e.g. NULL) " 635 "exception happens"); 636 637 PRODUCT_FLAG(bool, PrintCodeCache, false, JVMFlag::DEFAULT, 638 "Print the code cache memory usage when exiting"); 639 640 DEVELOP_FLAG(bool, PrintCodeCache2, false, JVMFlag::DEFAULT, 641 "Print detailed usage information on the code cache when exiting"); 642 643 PRODUCT_FLAG(bool, PrintCodeCacheOnCompilation, false, JVMFlag::DEFAULT, 644 "Print the code cache memory usage each time a method is " 645 "compiled"); 646 647 PRODUCT_FLAG(bool, PrintCodeHeapAnalytics, false, JVMFlag::DIAGNOSTIC, 648 "Print code heap usage statistics on exit and on full condition"); 649 650 PRODUCT_FLAG(bool, PrintStubCode, false, JVMFlag::DIAGNOSTIC, 651 "Print generated stub code"); 652 653 PRODUCT_FLAG(bool, StackTraceInThrowable, true, JVMFlag::DEFAULT, 654 "Collect backtrace in throwable when exception happens"); 655 656 PRODUCT_FLAG(bool, OmitStackTraceInFastThrow, true, JVMFlag::DEFAULT, 657 "Omit backtraces for some 'hot' exceptions in optimized code"); 658 659 PRODUCT_FLAG(bool, ShowCodeDetailsInExceptionMessages, false, JVMFlag::MANAGEABLE, 660 "Show exception messages from RuntimeExceptions that contain " 661 "snippets of the failing code. Disable this to improve privacy."); 662 663 PRODUCT_FLAG(bool, PrintWarnings, true, JVMFlag::DEFAULT, 664 "Print JVM warnings to output stream"); 665 666 NOTPROD_FLAG(uintx, WarnOnStalledSpinLock, 0, JVMFlag::DEFAULT, 667 "Print warnings for stalled SpinLocks"); 668 669 PRODUCT_FLAG(bool, RegisterFinalizersAtInit, true, JVMFlag::DEFAULT, 670 "Register finalizable objects at end of Object.<init> or " 671 "after allocation"); 672 673 DEVELOP_FLAG(bool, RegisterReferences, true, JVMFlag::DEFAULT, 674 "Tell whether the VM should register soft/weak/final/phantom " 675 "references"); 676 677 DEVELOP_FLAG(bool, IgnoreRewrites, false, JVMFlag::DEFAULT, 678 "Suppress rewrites of bytecodes in the oopmap generator. " 679 "This is unsafe!"); 680 681 DEVELOP_FLAG(bool, PrintCodeCacheExtension, false, JVMFlag::DEFAULT, 682 "Print extension of code cache"); 683 684 DEVELOP_FLAG(bool, UsePrivilegedStack, true, JVMFlag::DEFAULT, 685 "Enable the security JVM functions"); 686 687 DEVELOP_FLAG(bool, ProtectionDomainVerification, true, JVMFlag::DEFAULT, 688 "Verify protection domain before resolution in system dictionary"); 689 690 PRODUCT_FLAG(bool, ClassUnloading, true, JVMFlag::DEFAULT, 691 "Do unloading of classes"); 692 693 PRODUCT_FLAG(bool, ClassUnloadingWithConcurrentMark, true, JVMFlag::DEFAULT, 694 "Do unloading of classes with a concurrent marking cycle"); 695 696 DEVELOP_FLAG(bool, DisableStartThread, false, JVMFlag::DEFAULT, 697 "Disable starting of additional Java threads " 698 "(for debugging only)"); 699 700 DEVELOP_FLAG(bool, MemProfiling, false, JVMFlag::DEFAULT, 701 "Write memory usage profiling to log file"); 702 703 DEVELOP_FLAG(bool, PrintSystemDictionaryAtExit, false, JVMFlag::DEFAULT, 704 "Print the system dictionary at exit"); 705 706 PRODUCT_FLAG(bool, DynamicallyResizeSystemDictionaries, true, JVMFlag::DIAGNOSTIC, 707 "Dynamically resize system dictionaries as needed"); 708 709 PRODUCT_FLAG(bool, AlwaysLockClassLoader, false, JVMFlag::DEFAULT, 710 "Require the VM to acquire the class loader lock before calling " 711 "loadClass() even for class loaders registering " 712 "as parallel capable"); 713 714 PRODUCT_FLAG(bool, AllowParallelDefineClass, false, JVMFlag::DEFAULT, 715 "Allow parallel defineClass requests for class loaders " 716 "registering as parallel capable"); 717 718 PRODUCT_FLAG_PD(bool, DontYieldALot, JVMFlag::DEFAULT, 719 "Throw away obvious excess yield calls"); 720 721 DEVELOP_FLAG(bool, UseDetachedThreads, true, JVMFlag::DEFAULT, 722 "Use detached threads that are recycled upon termination " 723 "(for Solaris only)"); 724 725 PRODUCT_FLAG(bool, DisablePrimordialThreadGuardPages, false, JVMFlag::EXPERIMENTAL, 726 "Disable the use of stack guard pages if the JVM is loaded " 727 "on the primordial process thread"); 728 729 PRODUCT_FLAG(bool, UseLWPSynchronization, true, JVMFlag::DEFAULT, 730 "Use LWP-based instead of libthread-based synchronization " 731 "(SPARC only)"); 732 733 PRODUCT_FLAG(intx, MonitorBound, 0, JVMFlag::RANGE, 734 "(Deprecated) Bound Monitor population"); 735 FLAG_RANGE( MonitorBound, 0, max_jint); 736 737 PRODUCT_FLAG(intx, MonitorUsedDeflationThreshold, 90, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 738 "Percentage of used monitors before triggering cleanup " 739 "safepoint which deflates monitors (0 is off). " 740 "The check is performed on GuaranteedSafepointInterval."); 741 FLAG_RANGE( MonitorUsedDeflationThreshold, 0, 100); 742 743 PRODUCT_FLAG(intx, hashCode, 5, JVMFlag::EXPERIMENTAL, 744 "(Unstable) select hashCode generation algorithm"); 745 746 PRODUCT_FLAG(bool, FilterSpuriousWakeups, true, JVMFlag::DEFAULT, 747 "When true prevents OS-level spurious, or premature, wakeups " 748 "from Object.wait (Ignored for Windows)"); 749 750 DEVELOP_FLAG(bool, UsePthreads, false, JVMFlag::DEFAULT, 751 "Use pthread-based instead of libthread-based synchronization " 752 "(SPARC only)"); 753 754 PRODUCT_FLAG(bool, ReduceSignalUsage, false, JVMFlag::DEFAULT, 755 "Reduce the use of OS signals in Java and/or the VM"); 756 757 DEVELOP_FLAG(bool, LoadLineNumberTables, true, JVMFlag::DEFAULT, 758 "Tell whether the class file parser loads line number tables"); 759 760 DEVELOP_FLAG(bool, LoadLocalVariableTables, true, JVMFlag::DEFAULT, 761 "Tell whether the class file parser loads local variable tables"); 762 763 DEVELOP_FLAG(bool, LoadLocalVariableTypeTables, true, JVMFlag::DEFAULT, 764 "Tell whether the class file parser loads local variable type" 765 "tables"); 766 767 PRODUCT_FLAG(bool, AllowUserSignalHandlers, false, JVMFlag::DEFAULT, 768 "Do not complain if the application installs signal handlers " 769 "(Solaris & Linux only)"); 770 771 PRODUCT_FLAG(bool, UseSignalChaining, true, JVMFlag::DEFAULT, 772 "Use signal-chaining to invoke signal handlers installed " 773 "by the application (Solaris & Linux only)"); 774 775 PRODUCT_FLAG(bool, RestoreMXCSROnJNICalls, false, JVMFlag::DEFAULT, 776 "Restore MXCSR when returning from JNI calls"); 777 778 PRODUCT_FLAG(bool, CheckJNICalls, false, JVMFlag::DEFAULT, 779 "Verify all arguments to JNI calls"); 780 781 PRODUCT_FLAG(bool, UseFastJNIAccessors, true, JVMFlag::DEFAULT, 782 "Use optimized versions of Get<Primitive>Field"); 783 784 PRODUCT_FLAG(intx, MaxJNILocalCapacity, 65536, JVMFlag::RANGE, 785 "Maximum allowable local JNI handle capacity to " 786 "EnsureLocalCapacity() and PushLocalFrame(), " 787 "where <= 0 is unlimited, default: 65536"); 788 FLAG_RANGE( MaxJNILocalCapacity, min_intx, max_intx); 789 790 PRODUCT_FLAG(bool, EagerXrunInit, false, JVMFlag::DEFAULT, 791 "Eagerly initialize -Xrun libraries; allows startup profiling, " 792 "but not all -Xrun libraries may support the state of the VM " 793 "at this time"); 794 795 PRODUCT_FLAG(bool, PreserveAllAnnotations, false, JVMFlag::DEFAULT, 796 "Preserve RuntimeInvisibleAnnotations as well " 797 "as RuntimeVisibleAnnotations"); 798 799 DEVELOP_FLAG(uintx, PreallocatedOutOfMemoryErrorCount, 4, JVMFlag::DEFAULT, 800 "Number of OutOfMemoryErrors preallocated with backtrace"); 801 802 PRODUCT_FLAG(bool, UseXMMForArrayCopy, false, JVMFlag::DEFAULT, 803 "Use SSE2 MOVQ instruction for Arraycopy"); 804 805 NOTPROD_FLAG(bool, PrintFieldLayout, false, JVMFlag::DEFAULT, 806 "Print field layout for each class"); 807 808 809 // Need to limit the extent of the padding to reasonable size. 810 // 8K is well beyond the reasonable HW cache line size, even with 811 // aggressive prefetching, while still leaving the room for segregating 812 // among the distinct pages. 813 PRODUCT_FLAG(intx, ContendedPaddingWidth, 128, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 814 "How many bytes to pad the fields/classes marked @Contended with"); 815 FLAG_RANGE( ContendedPaddingWidth, 0, 8192); 816 FLAG_CONSTRAINT( ContendedPaddingWidth, (void*)ContendedPaddingWidthConstraintFunc, JVMFlag::AfterErgo); 817 818 PRODUCT_FLAG(bool, EnableContended, true, JVMFlag::DEFAULT, 819 "Enable @Contended annotation support"); 820 821 PRODUCT_FLAG(bool, RestrictContended, true, JVMFlag::DEFAULT, 822 "Restrict @Contended to trusted classes"); 823 824 PRODUCT_FLAG(bool, UseBiasedLocking, true, JVMFlag::DEFAULT, 825 "Enable biased locking in JVM"); 826 827 PRODUCT_FLAG(intx, BiasedLockingStartupDelay, 0, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 828 "Number of milliseconds to wait before enabling biased locking"); 829 //TODO: to avoid circular dependency, the min/max cannot be declared in header file 830 //FLAG_RANGE( BiasedLockingStartupDelay, 0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))); 831 FLAG_CONSTRAINT( BiasedLockingStartupDelay, (void*)BiasedLockingStartupDelayFunc, JVMFlag::AfterErgo); 832 833 PRODUCT_FLAG(bool, PrintBiasedLockingStatistics, false, JVMFlag::DIAGNOSTIC, 834 "Print statistics of biased locking in JVM"); 835 836 PRODUCT_FLAG(intx, BiasedLockingBulkRebiasThreshold, 20, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 837 "Threshold of number of revocations per type to try to " 838 "rebias all objects in the heap of that type"); 839 FLAG_RANGE( BiasedLockingBulkRebiasThreshold, 0, max_intx); 840 FLAG_CONSTRAINT( BiasedLockingBulkRebiasThreshold, (void*)BiasedLockingBulkRebiasThresholdFunc, JVMFlag::AfterErgo); 841 842 PRODUCT_FLAG(intx, BiasedLockingBulkRevokeThreshold, 40, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 843 "Threshold of number of revocations per type to permanently " 844 "revoke biases of all objects in the heap of that type"); 845 FLAG_RANGE( BiasedLockingBulkRevokeThreshold, 0, max_intx); 846 FLAG_CONSTRAINT( BiasedLockingBulkRevokeThreshold, (void*)BiasedLockingBulkRevokeThresholdFunc, JVMFlag::AfterErgo); 847 848 PRODUCT_FLAG(intx, BiasedLockingDecayTime, 25000, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 849 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " 850 "type after previous bulk rebias"); 851 FLAG_RANGE( BiasedLockingDecayTime, 500, max_intx); 852 FLAG_CONSTRAINT( BiasedLockingDecayTime, (void*)BiasedLockingDecayTimeFunc, JVMFlag::AfterErgo); 853 854 PRODUCT_FLAG(bool, ExitOnOutOfMemoryError, false, JVMFlag::DEFAULT, 855 "JVM exits on the first occurrence of an out-of-memory error"); 856 857 PRODUCT_FLAG(bool, CrashOnOutOfMemoryError, false, JVMFlag::DEFAULT, 858 "JVM aborts, producing an error log and core/mini dump, on the " 859 "first occurrence of an out-of-memory error"); 860 861 862 // tracing 863 DEVELOP_FLAG(bool, StressRewriter, false, JVMFlag::DEFAULT, 864 "Stress linktime bytecode rewriting"); 865 866 PRODUCT_FLAG(ccstr, TraceJVMTI, NULL, JVMFlag::DEFAULT, 867 "Trace flags for JVMTI functions and events"); 868 869 870 // This option can change an EMCP method into an obsolete method. 871 // This can affect tests that except specific methods to be EMCP. 872 // This option should be used with caution. 873 PRODUCT_FLAG(bool, StressLdcRewrite, false, JVMFlag::DEFAULT, 874 "Force ldc -> ldc_w rewrite during RedefineClasses"); 875 876 877 // change to false by default sometime after Mustang 878 PRODUCT_FLAG(bool, VerifyMergedCPBytecodes, true, JVMFlag::DEFAULT, 879 "Verify bytecodes after RedefineClasses constant pool merging"); 880 881 PRODUCT_FLAG(bool, AllowRedefinitionToAddDeleteMethods, false, JVMFlag::DEFAULT, 882 "(Deprecated) Allow redefinition to add and delete private " 883 "static or final methods for compatibility with old releases"); 884 885 DEVELOP_FLAG(bool, TraceBytecodes, false, JVMFlag::DEFAULT, 886 "Trace bytecode execution"); 887 888 DEVELOP_FLAG(bool, TraceICs, false, JVMFlag::DEFAULT, 889 "Trace inline cache changes"); 890 891 NOTPROD_FLAG(bool, TraceInvocationCounterOverflow, false, JVMFlag::DEFAULT, 892 "Trace method invocation counter overflow"); 893 894 DEVELOP_FLAG(bool, TraceInlineCacheClearing, false, JVMFlag::DEFAULT, 895 "Trace clearing of inline caches in nmethods"); 896 897 DEVELOP_FLAG(bool, TraceDependencies, false, JVMFlag::DEFAULT, 898 "Trace dependencies"); 899 900 DEVELOP_FLAG(bool, VerifyDependencies, trueInDebug, JVMFlag::DEFAULT, 901 "Exercise and verify the compilation dependency mechanism"); 902 903 DEVELOP_FLAG(bool, TraceNewOopMapGeneration, false, JVMFlag::DEFAULT, 904 "Trace OopMapGeneration"); 905 906 DEVELOP_FLAG(bool, TraceNewOopMapGenerationDetailed, false, JVMFlag::DEFAULT, 907 "Trace OopMapGeneration: print detailed cell states"); 908 909 DEVELOP_FLAG(bool, TimeOopMap, false, JVMFlag::DEFAULT, 910 "Time calls to GenerateOopMap::compute_map() in sum"); 911 912 DEVELOP_FLAG(bool, TimeOopMap2, false, JVMFlag::DEFAULT, 913 "Time calls to GenerateOopMap::compute_map() individually"); 914 915 DEVELOP_FLAG(bool, TraceOopMapRewrites, false, JVMFlag::DEFAULT, 916 "Trace rewriting of method oops during oop map generation"); 917 918 DEVELOP_FLAG(bool, TraceICBuffer, false, JVMFlag::DEFAULT, 919 "Trace usage of IC buffer"); 920 921 DEVELOP_FLAG(bool, TraceCompiledIC, false, JVMFlag::DEFAULT, 922 "Trace changes of compiled IC"); 923 924 DEVELOP_FLAG(bool, FLSVerifyDictionary, false, JVMFlag::DEFAULT, 925 "Do lots of (expensive) FLS dictionary verification"); 926 927 DEVELOP_FLAG(bool, CheckMemoryInitialization, false, JVMFlag::DEFAULT, 928 "Check memory initialization"); 929 930 PRODUCT_FLAG(uintx, ProcessDistributionStride, 4, JVMFlag::RANGE, 931 "Stride through processors when distributing processes"); 932 FLAG_RANGE( ProcessDistributionStride, 0, max_juint); 933 934 DEVELOP_FLAG(bool, TraceFinalizerRegistration, false, JVMFlag::DEFAULT, 935 "Trace registration of final references"); 936 937 PRODUCT_FLAG(bool, IgnoreEmptyClassPaths, false, JVMFlag::DEFAULT, 938 "Ignore empty path elements in -classpath"); 939 940 PRODUCT_FLAG(size_t, InitialBootClassLoaderMetaspaceSize, NOT_LP64(2200*K) LP64_ONLY(4*M), JVMFlag::RANGE | JVMFlag::CONSTRAINT, 941 "Initial size of the boot class loader data metaspace"); 942 FLAG_RANGE( InitialBootClassLoaderMetaspaceSize, 30*K, max_uintx/BytesPerWord); 943 FLAG_CONSTRAINT( InitialBootClassLoaderMetaspaceSize, (void*)InitialBootClassLoaderMetaspaceSizeConstraintFunc, JVMFlag::AfterErgo); 944 945 PRODUCT_FLAG(bool, PrintHeapAtSIGBREAK, true, JVMFlag::DEFAULT, 946 "Print heap layout in response to SIGBREAK"); 947 948 PRODUCT_FLAG(bool, PrintClassHistogram, false, JVMFlag::MANAGEABLE, 949 "Print a histogram of class instances"); 950 951 PRODUCT_FLAG(double, ObjectCountCutOffPercent, 0.5, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 952 "The percentage of the used heap that the instances of a class " 953 "must occupy for the class to generate a trace event"); 954 FLAG_RANGE( ObjectCountCutOffPercent, 0.0, 100.0); 955 956 957 // JVMTI heap profiling 958 PRODUCT_FLAG(bool, TraceJVMTIObjectTagging, false, JVMFlag::DIAGNOSTIC, 959 "Trace JVMTI object tagging calls"); 960 961 PRODUCT_FLAG(bool, VerifyBeforeIteration, false, JVMFlag::DIAGNOSTIC, 962 "Verify memory system before JVMTI iteration"); 963 964 965 // compiler interface 966 DEVELOP_FLAG(bool, CIPrintCompilerName, false, JVMFlag::DEFAULT, 967 "when CIPrint is active, print the name of the active compiler"); 968 969 PRODUCT_FLAG(bool, CIPrintCompileQueue, false, JVMFlag::DIAGNOSTIC, 970 "display the contents of the compile queue whenever a " 971 "compilation is enqueued"); 972 973 DEVELOP_FLAG(bool, CIPrintRequests, false, JVMFlag::DEFAULT, 974 "display every request for compilation"); 975 976 PRODUCT_FLAG(bool, CITime, false, JVMFlag::DEFAULT, 977 "collect timing information for compilation"); 978 979 DEVELOP_FLAG(bool, CITimeVerbose, false, JVMFlag::DEFAULT, 980 "be more verbose in compilation timings"); 981 982 DEVELOP_FLAG(bool, CITimeEach, false, JVMFlag::DEFAULT, 983 "display timing information after each successful compilation"); 984 985 DEVELOP_FLAG(bool, CICountOSR, false, JVMFlag::DEFAULT, 986 "use a separate counter when assigning ids to osr compilations"); 987 988 DEVELOP_FLAG(bool, CICompileNatives, true, JVMFlag::DEFAULT, 989 "compile native methods if supported by the compiler"); 990 991 DEVELOP_FLAG_PD(bool, CICompileOSR, JVMFlag::DEFAULT, 992 "compile on stack replacement methods if supported by the " 993 "compiler"); 994 995 DEVELOP_FLAG(bool, CIPrintMethodCodes, false, JVMFlag::DEFAULT, 996 "print method bytecodes of the compiled code"); 997 998 DEVELOP_FLAG(bool, CIPrintTypeFlow, false, JVMFlag::DEFAULT, 999 "print the results of ciTypeFlow analysis"); 1000 1001 DEVELOP_FLAG(bool, CITraceTypeFlow, false, JVMFlag::DEFAULT, 1002 "detailed per-bytecode tracing of ciTypeFlow analysis"); 1003 1004 DEVELOP_FLAG(intx, OSROnlyBCI, -1, JVMFlag::DEFAULT, 1005 "OSR only at this bci. Negative values mean exclude that bci"); 1006 1007 1008 // compiler 1009 // notice: the max range value here is max_jint, not max_intx 1010 // because of overflow issue 1011 PRODUCT_FLAG(intx, CICompilerCount, CI_COMPILER_COUNT, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1012 "Number of compiler threads to run"); 1013 FLAG_RANGE( CICompilerCount, 0, max_jint); 1014 FLAG_CONSTRAINT( CICompilerCount, (void*)CICompilerCountConstraintFunc, JVMFlag::AfterErgo); 1015 1016 PRODUCT_FLAG(bool, UseDynamicNumberOfCompilerThreads, true, JVMFlag::DEFAULT, 1017 "Dynamically choose the number of parallel compiler threads"); 1018 1019 PRODUCT_FLAG(bool, ReduceNumberOfCompilerThreads, true, JVMFlag::DIAGNOSTIC, 1020 "Reduce the number of parallel compiler threads when they " 1021 "are not used"); 1022 1023 PRODUCT_FLAG(bool, TraceCompilerThreads, false, JVMFlag::DIAGNOSTIC, 1024 "Trace creation and removal of compiler threads"); 1025 1026 DEVELOP_FLAG(bool, InjectCompilerCreationFailure, false, JVMFlag::DEFAULT, 1027 "Inject thread creation failures for " 1028 "UseDynamicNumberOfCompilerThreads"); 1029 1030 DEVELOP_FLAG(bool, UseStackBanging, true, JVMFlag::DEFAULT, 1031 "use stack banging for stack overflow checks (required for " 1032 "proper StackOverflow handling; disable only to measure cost " 1033 "of stackbanging)"); 1034 1035 DEVELOP_FLAG(bool, GenerateSynchronizationCode, true, JVMFlag::DEFAULT, 1036 "generate locking/unlocking code for synchronized methods and " 1037 "monitors"); 1038 1039 DEVELOP_FLAG(bool, GenerateRangeChecks, true, JVMFlag::DEFAULT, 1040 "Generate range checks for array accesses"); 1041 1042 PRODUCT_FLAG_PD(bool, ImplicitNullChecks, JVMFlag::DIAGNOSTIC, 1043 "Generate code for implicit null checks"); 1044 1045 PRODUCT_FLAG_PD(bool, TrapBasedNullChecks, JVMFlag::DEFAULT, 1046 "Generate code for null checks that uses a cmp and trap " 1047 "instruction raising SIGTRAP. This is only used if an access to" 1048 "null (+offset) will not raise a SIGSEGV, i.e.," 1049 "ImplicitNullChecks don't work (PPC64)."); 1050 1051 PRODUCT_FLAG(bool, EnableThreadSMRExtraValidityChecks, true, JVMFlag::DIAGNOSTIC, 1052 "Enable Thread SMR extra validity checks"); 1053 1054 PRODUCT_FLAG(bool, EnableThreadSMRStatistics, trueInDebug, JVMFlag::DIAGNOSTIC, 1055 "Enable Thread SMR Statistics"); 1056 1057 PRODUCT_FLAG(bool, UseNotificationThread, true, JVMFlag::DEFAULT, 1058 "Use Notification Thread"); 1059 1060 PRODUCT_FLAG(bool, Inline, true, JVMFlag::DEFAULT, 1061 "Enable inlining"); 1062 1063 PRODUCT_FLAG(bool, ClipInlining, true, JVMFlag::DEFAULT, 1064 "Clip inlining if aggregate method exceeds DesiredMethodLimit"); 1065 1066 DEVELOP_FLAG(bool, UseCHA, true, JVMFlag::DEFAULT, 1067 "Enable CHA"); 1068 1069 PRODUCT_FLAG(bool, UseTypeProfile, true, JVMFlag::DEFAULT, 1070 "Check interpreter profile for historically monomorphic calls"); 1071 1072 PRODUCT_FLAG(bool, PrintInlining, false, JVMFlag::DIAGNOSTIC, 1073 "Print inlining optimizations"); 1074 1075 PRODUCT_FLAG(bool, UsePopCountInstruction, false, JVMFlag::DEFAULT, 1076 "Use population count instruction"); 1077 1078 DEVELOP_FLAG(bool, EagerInitialization, false, JVMFlag::DEFAULT, 1079 "Eagerly initialize classes if possible"); 1080 1081 PRODUCT_FLAG(bool, LogTouchedMethods, false, JVMFlag::DIAGNOSTIC, 1082 "Log methods which have been ever touched in runtime"); 1083 1084 PRODUCT_FLAG(bool, PrintTouchedMethodsAtExit, false, JVMFlag::DIAGNOSTIC, 1085 "Print all methods that have been ever touched in runtime"); 1086 1087 DEVELOP_FLAG(bool, TraceMethodReplacement, false, JVMFlag::DEFAULT, 1088 "Print when methods are replaced do to recompilation"); 1089 1090 DEVELOP_FLAG(bool, PrintMethodFlushing, false, JVMFlag::DEFAULT, 1091 "Print the nmethods being flushed"); 1092 1093 PRODUCT_FLAG(bool, PrintMethodFlushingStatistics, false, JVMFlag::DIAGNOSTIC, 1094 "print statistics about method flushing"); 1095 1096 PRODUCT_FLAG(intx, HotMethodDetectionLimit, 100000, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 1097 "Number of compiled code invocations after which " 1098 "the method is considered as hot by the flusher"); 1099 FLAG_RANGE( HotMethodDetectionLimit, 1, max_jint); 1100 1101 PRODUCT_FLAG(intx, MinPassesBeforeFlush, 10, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 1102 "Minimum number of sweeper passes before an nmethod " 1103 "can be flushed"); 1104 FLAG_RANGE( MinPassesBeforeFlush, 0, max_intx); 1105 1106 PRODUCT_FLAG(bool, UseCodeAging, true, JVMFlag::DEFAULT, 1107 "Insert counter to detect warm methods"); 1108 1109 PRODUCT_FLAG(bool, StressCodeAging, false, JVMFlag::DIAGNOSTIC, 1110 "Start with counters compiled in"); 1111 1112 DEVELOP_FLAG(bool, StressCodeBuffers, false, JVMFlag::DEFAULT, 1113 "Exercise code buffer expansion and other rare state changes"); 1114 1115 PRODUCT_FLAG(bool, DebugNonSafepoints, trueInDebug, JVMFlag::DIAGNOSTIC, 1116 "Generate extra debugging information for non-safepoints in " 1117 "nmethods"); 1118 1119 PRODUCT_FLAG(bool, PrintVMOptions, false, JVMFlag::DEFAULT, 1120 "Print flags that appeared on the command line"); 1121 1122 PRODUCT_FLAG(bool, IgnoreUnrecognizedVMOptions, false, JVMFlag::DEFAULT, 1123 "Ignore unrecognized VM options"); 1124 1125 PRODUCT_FLAG(bool, PrintCommandLineFlags, false, JVMFlag::DEFAULT, 1126 "Print flags specified on command line or set by ergonomics"); 1127 1128 PRODUCT_FLAG(bool, PrintFlagsInitial, false, JVMFlag::DEFAULT, 1129 "Print all VM flags before argument processing and exit VM"); 1130 1131 PRODUCT_FLAG(bool, PrintFlagsFinal, false, JVMFlag::DEFAULT, 1132 "Print all VM flags after argument and ergonomic processing"); 1133 1134 NOTPROD_FLAG(bool, PrintFlagsWithComments, false, JVMFlag::DEFAULT, 1135 "Print all VM flags with default values and descriptions and " 1136 "exit"); 1137 1138 PRODUCT_FLAG(bool, PrintFlagsRanges, false, JVMFlag::DEFAULT, 1139 "Print VM flags and their ranges"); 1140 1141 PRODUCT_FLAG(bool, SerializeVMOutput, true, JVMFlag::DIAGNOSTIC, 1142 "Use a mutex to serialize output to tty and LogFile"); 1143 1144 PRODUCT_FLAG(bool, DisplayVMOutput, true, JVMFlag::DIAGNOSTIC, 1145 "Display all VM output on the tty, independently of LogVMOutput"); 1146 1147 PRODUCT_FLAG(bool, LogVMOutput, false, JVMFlag::DIAGNOSTIC, 1148 "Save VM output to LogFile"); 1149 1150 PRODUCT_FLAG(ccstr, LogFile, NULL, JVMFlag::DIAGNOSTIC, 1151 "If LogVMOutput or LogCompilation is on, save VM output to " 1152 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)"); 1153 1154 PRODUCT_FLAG(ccstr, ErrorFile, NULL, JVMFlag::DEFAULT, 1155 "If an error occurs, save the error data to this file " 1156 "[default: ./hs_err_pid%p.log] (%p replaced with pid)"); 1157 1158 PRODUCT_FLAG(bool, ExtensiveErrorReports, PRODUCT_ONLY(false) NOT_PRODUCT(true), JVMFlag::DEFAULT, 1159 "Error reports are more extensive."); 1160 1161 PRODUCT_FLAG(bool, DisplayVMOutputToStderr, false, JVMFlag::DEFAULT, 1162 "If DisplayVMOutput is true, display all VM output to stderr"); 1163 1164 PRODUCT_FLAG(bool, DisplayVMOutputToStdout, false, JVMFlag::DEFAULT, 1165 "If DisplayVMOutput is true, display all VM output to stdout"); 1166 1167 PRODUCT_FLAG(bool, ErrorFileToStderr, false, JVMFlag::DEFAULT, 1168 "If true, error data is printed to stderr instead of a file"); 1169 1170 PRODUCT_FLAG(bool, ErrorFileToStdout, false, JVMFlag::DEFAULT, 1171 "If true, error data is printed to stdout instead of a file"); 1172 1173 PRODUCT_FLAG(bool, UseHeavyMonitors, false, JVMFlag::DEFAULT, 1174 "use heavyweight instead of lightweight Java monitors"); 1175 1176 PRODUCT_FLAG(bool, PrintStringTableStatistics, false, JVMFlag::DEFAULT, 1177 "print statistics about the StringTable and SymbolTable"); 1178 1179 PRODUCT_FLAG(bool, VerifyStringTableAtExit, false, JVMFlag::DIAGNOSTIC, 1180 "verify StringTable contents at exit"); 1181 1182 NOTPROD_FLAG(bool, PrintSymbolTableSizeHistogram, false, JVMFlag::DEFAULT, 1183 "print histogram of the symbol table"); 1184 1185 NOTPROD_FLAG(bool, ExitVMOnVerifyError, false, JVMFlag::DEFAULT, 1186 "standard exit from VM if bytecode verify error " 1187 "(only in debug mode)"); 1188 1189 PRODUCT_FLAG(ccstr, AbortVMOnException, NULL, JVMFlag::DIAGNOSTIC, 1190 "Call fatal if this exception is thrown. Example: " 1191 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo"); 1192 1193 PRODUCT_FLAG(ccstr, AbortVMOnExceptionMessage, NULL, JVMFlag::DIAGNOSTIC, 1194 "Call fatal if the exception pointed by AbortVMOnException " 1195 "has this message"); 1196 1197 DEVELOP_FLAG(bool, DebugVtables, false, JVMFlag::DEFAULT, 1198 "add debugging code to vtable dispatch"); 1199 1200 NOTPROD_FLAG(bool, PrintVtableStats, false, JVMFlag::DEFAULT, 1201 "print vtables stats at end of run"); 1202 1203 DEVELOP_FLAG(bool, TraceCreateZombies, false, JVMFlag::DEFAULT, 1204 "trace creation of zombie nmethods"); 1205 1206 PRODUCT_FLAG(bool, RangeCheckElimination, true, JVMFlag::DEFAULT, 1207 "Eliminate range checks"); 1208 1209 DEVELOP_FLAG_PD(bool, UncommonNullCast, JVMFlag::DEFAULT, 1210 "track occurrences of null in casts; adjust compiler tactics"); 1211 1212 DEVELOP_FLAG(bool, TypeProfileCasts, true, JVMFlag::DEFAULT, 1213 "treat casts like calls for purposes of type profiling"); 1214 1215 DEVELOP_FLAG(bool, TraceLivenessGen, false, JVMFlag::DEFAULT, 1216 "Trace the generation of liveness analysis information"); 1217 1218 NOTPROD_FLAG(bool, TraceLivenessQuery, false, JVMFlag::DEFAULT, 1219 "Trace queries of liveness analysis information"); 1220 1221 NOTPROD_FLAG(bool, CollectIndexSetStatistics, false, JVMFlag::DEFAULT, 1222 "Collect information about IndexSets"); 1223 1224 DEVELOP_FLAG(bool, UseLoopSafepoints, true, JVMFlag::DEFAULT, 1225 "Generate Safepoint nodes in every loop"); 1226 1227 DEVELOP_FLAG(intx, FastAllocateSizeLimit, 128*K, JVMFlag::DEFAULT, 1228 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ 1229 "Inline allocations larger than this in doublewords must go slow"); 1230 1231 1232 // Note: This value is zero mod 1<<13 for a cheap sparc set. 1233 PRODUCT_FLAG_PD(bool, CompactStrings, JVMFlag::DEFAULT, 1234 "Enable Strings to use single byte chars in backing store"); 1235 1236 PRODUCT_FLAG_PD(uintx, TypeProfileLevel, JVMFlag::CONSTRAINT, 1237 "=XYZ, with Z: Type profiling of arguments at call; " 1238 "Y: Type profiling of return value at call; " 1239 "X: Type profiling of parameters to methods; " 1240 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods"); 1241 FLAG_CONSTRAINT( TypeProfileLevel, (void*)TypeProfileLevelConstraintFunc, JVMFlag::AfterErgo); 1242 1243 PRODUCT_FLAG(intx, TypeProfileArgsLimit, 2, JVMFlag::RANGE, 1244 "max number of call arguments to consider for type profiling"); 1245 FLAG_RANGE( TypeProfileArgsLimit, 0, 16); 1246 1247 PRODUCT_FLAG(intx, TypeProfileParmsLimit, 2, JVMFlag::RANGE, 1248 "max number of incoming parameters to consider for type profiling" 1249 ", -1 for all"); 1250 FLAG_RANGE( TypeProfileParmsLimit, -1, 64); 1251 1252 1253 // statistics 1254 DEVELOP_FLAG(bool, CountCompiledCalls, false, JVMFlag::DEFAULT, 1255 "Count method invocations"); 1256 1257 NOTPROD_FLAG(bool, CountRuntimeCalls, false, JVMFlag::DEFAULT, 1258 "Count VM runtime calls"); 1259 1260 DEVELOP_FLAG(bool, CountJNICalls, false, JVMFlag::DEFAULT, 1261 "Count jni method invocations"); 1262 1263 NOTPROD_FLAG(bool, CountJVMCalls, false, JVMFlag::DEFAULT, 1264 "Count jvm method invocations"); 1265 1266 NOTPROD_FLAG(bool, CountRemovableExceptions, false, JVMFlag::DEFAULT, 1267 "Count exceptions that could be replaced by branches due to " 1268 "inlining"); 1269 1270 NOTPROD_FLAG(bool, ICMissHistogram, false, JVMFlag::DEFAULT, 1271 "Produce histogram of IC misses"); 1272 1273 1274 // interpreter 1275 PRODUCT_FLAG_PD(bool, RewriteBytecodes, JVMFlag::DEFAULT, 1276 "Allow rewriting of bytecodes (bytecodes are not immutable)"); 1277 1278 PRODUCT_FLAG_PD(bool, RewriteFrequentPairs, JVMFlag::DEFAULT, 1279 "Rewrite frequently used bytecode pairs into a single bytecode"); 1280 1281 PRODUCT_FLAG(bool, PrintInterpreter, false, JVMFlag::DIAGNOSTIC, 1282 "Print the generated interpreter code"); 1283 1284 PRODUCT_FLAG(bool, UseInterpreter, true, JVMFlag::DEFAULT, 1285 "Use interpreter for non-compiled methods"); 1286 1287 DEVELOP_FLAG(bool, UseFastSignatureHandlers, true, JVMFlag::DEFAULT, 1288 "Use fast signature handlers for native calls"); 1289 1290 PRODUCT_FLAG(bool, UseLoopCounter, true, JVMFlag::DEFAULT, 1291 "Increment invocation counter on backward branch"); 1292 1293 PRODUCT_FLAG_PD(bool, UseOnStackReplacement, JVMFlag::DEFAULT, 1294 "Use on stack replacement, calls runtime if invoc. counter " 1295 "overflows in loop"); 1296 1297 NOTPROD_FLAG(bool, TraceOnStackReplacement, false, JVMFlag::DEFAULT, 1298 "Trace on stack replacement"); 1299 1300 PRODUCT_FLAG_PD(bool, PreferInterpreterNativeStubs, JVMFlag::DEFAULT, 1301 "Use always interpreter stubs for native methods invoked via " 1302 "interpreter"); 1303 1304 DEVELOP_FLAG(bool, CountBytecodes, false, JVMFlag::DEFAULT, 1305 "Count number of bytecodes executed"); 1306 1307 DEVELOP_FLAG(bool, PrintBytecodeHistogram, false, JVMFlag::DEFAULT, 1308 "Print histogram of the executed bytecodes"); 1309 1310 DEVELOP_FLAG(bool, PrintBytecodePairHistogram, false, JVMFlag::DEFAULT, 1311 "Print histogram of the executed bytecode pairs"); 1312 1313 PRODUCT_FLAG(bool, PrintSignatureHandlers, false, JVMFlag::DIAGNOSTIC, 1314 "Print code generated for native method signature handlers"); 1315 1316 DEVELOP_FLAG(bool, VerifyOops, false, JVMFlag::DEFAULT, 1317 "Do plausibility checks for oops"); 1318 1319 DEVELOP_FLAG(bool, CheckUnhandledOops, false, JVMFlag::DEFAULT, 1320 "Check for unhandled oops in VM code"); 1321 1322 DEVELOP_FLAG(bool, VerifyJNIFields, trueInDebug, JVMFlag::DEFAULT, 1323 "Verify jfieldIDs for instance fields"); 1324 1325 NOTPROD_FLAG(bool, VerifyJNIEnvThread, false, JVMFlag::DEFAULT, 1326 "Verify JNIEnv.thread == Thread::current() when entering VM " 1327 "from JNI"); 1328 1329 DEVELOP_FLAG(bool, VerifyFPU, false, JVMFlag::DEFAULT, 1330 "Verify FPU state (check for NaN's, etc.)"); 1331 1332 DEVELOP_FLAG(bool, VerifyThread, false, JVMFlag::DEFAULT, 1333 "Watch the thread register for corruption (SPARC only)"); 1334 1335 DEVELOP_FLAG(bool, VerifyActivationFrameSize, false, JVMFlag::DEFAULT, 1336 "Verify that activation frame didn't become smaller than its " 1337 "minimal size"); 1338 1339 DEVELOP_FLAG(bool, TraceFrequencyInlining, false, JVMFlag::DEFAULT, 1340 "Trace frequency based inlining"); 1341 1342 DEVELOP_FLAG_PD(bool, InlineIntrinsics, JVMFlag::DEFAULT, 1343 "Inline intrinsics that can be statically resolved"); 1344 1345 PRODUCT_FLAG_PD(bool, ProfileInterpreter, JVMFlag::DEFAULT, 1346 "Profile at the bytecode level during interpretation"); 1347 1348 DEVELOP_FLAG(bool, TraceProfileInterpreter, false, JVMFlag::DEFAULT, 1349 "Trace profiling at the bytecode level during interpretation. " 1350 "This outputs the profiling information collected to improve " 1351 "jit compilation."); 1352 1353 DEVELOP_FLAG_PD(bool, ProfileTraps, JVMFlag::DEFAULT, 1354 "Profile deoptimization traps at the bytecode level"); 1355 1356 PRODUCT_FLAG(intx, ProfileMaturityPercentage, 20, JVMFlag::RANGE, 1357 "number of method invocations/branches (expressed as % of " 1358 "CompileThreshold) before using the method's profile"); 1359 FLAG_RANGE( ProfileMaturityPercentage, 0, 100); 1360 1361 PRODUCT_FLAG(bool, PrintMethodData, false, JVMFlag::DIAGNOSTIC, 1362 "Print the results of +ProfileInterpreter at end of run"); 1363 1364 DEVELOP_FLAG(bool, VerifyDataPointer, trueInDebug, JVMFlag::DEFAULT, 1365 "Verify the method data pointer during interpreter profiling"); 1366 1367 DEVELOP_FLAG(bool, VerifyCompiledCode, false, JVMFlag::DEFAULT, 1368 "Include miscellaneous runtime verifications in nmethod code; " 1369 "default off because it disturbs nmethod size heuristics"); 1370 1371 NOTPROD_FLAG(bool, CrashGCForDumpingJavaThread, false, JVMFlag::DEFAULT, 1372 "Manually make GC thread crash then dump java stack trace; " 1373 "Test only"); 1374 1375 1376 // compilation 1377 PRODUCT_FLAG(bool, UseCompiler, true, JVMFlag::DEFAULT, 1378 "Use Just-In-Time compilation"); 1379 1380 PRODUCT_FLAG(bool, UseCounterDecay, true, JVMFlag::DEFAULT, 1381 "Adjust recompilation counters"); 1382 1383 DEVELOP_FLAG(intx, CounterHalfLifeTime, 30, JVMFlag::DEFAULT, 1384 "Half-life time of invocation counters (in seconds)"); 1385 1386 DEVELOP_FLAG(intx, CounterDecayMinIntervalLength, 500, JVMFlag::DEFAULT, 1387 "The minimum interval (in milliseconds) between invocation of " 1388 "CounterDecay"); 1389 1390 PRODUCT_FLAG(bool, AlwaysCompileLoopMethods, false, JVMFlag::DEFAULT, 1391 "When using recompilation, never interpret methods " 1392 "containing loops"); 1393 1394 PRODUCT_FLAG(bool, DontCompileHugeMethods, true, JVMFlag::DEFAULT, 1395 "Do not compile methods > HugeMethodLimit"); 1396 1397 1398 // Bytecode escape analysis estimation. 1399 PRODUCT_FLAG(bool, EstimateArgEscape, true, JVMFlag::DEFAULT, 1400 "Analyze bytecodes to estimate escape state of arguments"); 1401 1402 PRODUCT_FLAG(intx, BCEATraceLevel, 0, JVMFlag::RANGE, 1403 "How much tracing to do of bytecode escape analysis estimates " 1404 "(0-3)"); 1405 FLAG_RANGE( BCEATraceLevel, 0, 3); 1406 1407 PRODUCT_FLAG(intx, MaxBCEAEstimateLevel, 5, JVMFlag::RANGE, 1408 "Maximum number of nested calls that are analyzed by BC EA"); 1409 FLAG_RANGE( MaxBCEAEstimateLevel, 0, max_jint); 1410 1411 PRODUCT_FLAG(intx, MaxBCEAEstimateSize, 150, JVMFlag::RANGE, 1412 "Maximum bytecode size of a method to be analyzed by BC EA"); 1413 FLAG_RANGE( MaxBCEAEstimateSize, 0, max_jint); 1414 1415 PRODUCT_FLAG(intx, AllocatePrefetchStyle, 1, JVMFlag::RANGE, 1416 "0 = no prefetch, " 1417 "1 = generate prefetch instructions for each allocation, " 1418 "2 = use TLAB watermark to gate allocation prefetch, " 1419 "3 = generate one prefetch instruction per cache line"); 1420 FLAG_RANGE( AllocatePrefetchStyle, 0, 3); 1421 1422 PRODUCT_FLAG(intx, AllocatePrefetchDistance, -1, JVMFlag::CONSTRAINT, 1423 "Distance to prefetch ahead of allocation pointer. " 1424 "-1: use system-specific value (automatically determined"); 1425 FLAG_CONSTRAINT( AllocatePrefetchDistance, (void*)AllocatePrefetchDistanceConstraintFunc, JVMFlag::AfterMemoryInit); 1426 1427 PRODUCT_FLAG(intx, AllocatePrefetchLines, 3, JVMFlag::RANGE, 1428 "Number of lines to prefetch ahead of array allocation pointer"); 1429 FLAG_RANGE( AllocatePrefetchLines, 1, 64); 1430 1431 PRODUCT_FLAG(intx, AllocateInstancePrefetchLines, 1, JVMFlag::RANGE, 1432 "Number of lines to prefetch ahead of instance allocation " 1433 "pointer"); 1434 FLAG_RANGE( AllocateInstancePrefetchLines, 1, 64); 1435 1436 PRODUCT_FLAG(intx, AllocatePrefetchStepSize, 16, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1437 "Step size in bytes of sequential prefetch instructions"); 1438 FLAG_RANGE( AllocatePrefetchStepSize, 1, 512); 1439 FLAG_CONSTRAINT( AllocatePrefetchStepSize, (void*)AllocatePrefetchStepSizeConstraintFunc, JVMFlag::AfterMemoryInit); 1440 1441 PRODUCT_FLAG(intx, AllocatePrefetchInstr, 0, JVMFlag::CONSTRAINT, 1442 "Select instruction to prefetch ahead of allocation pointer"); 1443 FLAG_CONSTRAINT( AllocatePrefetchInstr, (void*)AllocatePrefetchInstrConstraintFunc, JVMFlag::AfterMemoryInit); 1444 1445 1446 // deoptimization 1447 DEVELOP_FLAG(bool, TraceDeoptimization, false, JVMFlag::DEFAULT, 1448 "Trace deoptimization"); 1449 1450 DEVELOP_FLAG(bool, PrintDeoptimizationDetails, false, JVMFlag::DEFAULT, 1451 "Print more information about deoptimization"); 1452 1453 DEVELOP_FLAG(bool, DebugDeoptimization, false, JVMFlag::DEFAULT, 1454 "Tracing various information while debugging deoptimization"); 1455 1456 PRODUCT_FLAG(intx, SelfDestructTimer, 0, JVMFlag::RANGE, 1457 "Will cause VM to terminate after a given time (in minutes) " 1458 "(0 means off)"); 1459 FLAG_RANGE( SelfDestructTimer, 0, max_intx); 1460 1461 PRODUCT_FLAG(intx, MaxJavaStackTraceDepth, 1024, JVMFlag::RANGE, 1462 "The maximum number of lines in the stack trace for Java " 1463 "exceptions (0 means all)"); 1464 FLAG_RANGE( MaxJavaStackTraceDepth, 0, max_jint/2); 1465 1466 1467 // notice: the max range value here is max_jint, not max_intx 1468 // because of overflow issue 1469 PRODUCT_FLAG(intx, GuaranteedSafepointInterval, 1000, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 1470 "Guarantee a safepoint (at least) every so many milliseconds " 1471 "(0 means none)"); 1472 FLAG_RANGE( GuaranteedSafepointInterval, 0, max_jint); 1473 1474 PRODUCT_FLAG(intx, SafepointTimeoutDelay, 10000, JVMFlag::RANGE, 1475 "Delay in milliseconds for option SafepointTimeout"); 1476 FLAG_RANGE( SafepointTimeoutDelay, 0, max_intx LP64_ONLY(/MICROUNITS)); 1477 1478 PRODUCT_FLAG(intx, NmethodSweepActivity, 10, JVMFlag::RANGE, 1479 "Removes cold nmethods from code cache if > 0. Higher values " 1480 "result in more aggressive sweeping"); 1481 FLAG_RANGE( NmethodSweepActivity, 0, 2000); 1482 1483 NOTPROD_FLAG(bool, LogSweeper, false, JVMFlag::DEFAULT, 1484 "Keep a ring buffer of sweeper activity"); 1485 1486 NOTPROD_FLAG(intx, SweeperLogEntries, 1024, JVMFlag::DEFAULT, 1487 "Number of records in the ring buffer of sweeper activity"); 1488 1489 NOTPROD_FLAG(intx, MemProfilingInterval, 500, JVMFlag::DEFAULT, 1490 "Time between each invocation of the MemProfiler"); 1491 1492 DEVELOP_FLAG(intx, MallocCatchPtr, -1, JVMFlag::DEFAULT, 1493 "Hit breakpoint when mallocing/freeing this pointer"); 1494 1495 NOTPROD_FLAG(ccstr, SuppressErrorAt, "", JVMFlag::STRINGLIST, 1496 "List of assertions (file:line) to muzzle"); 1497 1498 DEVELOP_FLAG(intx, StackPrintLimit, 100, JVMFlag::DEFAULT, 1499 "number of stack frames to print in VM-level stack dump"); 1500 1501 NOTPROD_FLAG(intx, MaxElementPrintSize, 256, JVMFlag::DEFAULT, 1502 "maximum number of elements to print"); 1503 1504 NOTPROD_FLAG(intx, MaxSubklassPrintSize, 4, JVMFlag::DEFAULT, 1505 "maximum number of subklasses to print when printing klass"); 1506 1507 PRODUCT_FLAG(intx, MaxInlineLevel, 15, JVMFlag::RANGE, 1508 "maximum number of nested calls that are inlined"); 1509 FLAG_RANGE( MaxInlineLevel, 0, max_jint); 1510 1511 PRODUCT_FLAG(intx, MaxRecursiveInlineLevel, 1, JVMFlag::RANGE, 1512 "maximum number of nested recursive calls that are inlined"); 1513 FLAG_RANGE( MaxRecursiveInlineLevel, 0, max_jint); 1514 1515 DEVELOP_FLAG(intx, MaxForceInlineLevel, 100, JVMFlag::RANGE, 1516 "maximum number of nested calls that are forced for inlining " 1517 "(using CompileCommand or marked w/ @ForceInline)"); 1518 FLAG_RANGE( MaxForceInlineLevel, 0, max_jint); 1519 1520 PRODUCT_FLAG_PD(intx, InlineSmallCode, JVMFlag::RANGE, 1521 "Only inline already compiled methods if their code size is " 1522 "less than this"); 1523 FLAG_RANGE( InlineSmallCode, 0, max_jint); 1524 1525 PRODUCT_FLAG(intx, MaxInlineSize, 35, JVMFlag::RANGE, 1526 "The maximum bytecode size of a method to be inlined"); 1527 FLAG_RANGE( MaxInlineSize, 0, max_jint); 1528 1529 PRODUCT_FLAG_PD(intx, FreqInlineSize, JVMFlag::RANGE, 1530 "The maximum bytecode size of a frequent method to be inlined"); 1531 FLAG_RANGE( FreqInlineSize, 0, max_jint); 1532 1533 PRODUCT_FLAG(intx, MaxTrivialSize, 6, JVMFlag::RANGE, 1534 "The maximum bytecode size of a trivial method to be inlined"); 1535 FLAG_RANGE( MaxTrivialSize, 0, max_jint); 1536 1537 PRODUCT_FLAG(intx, MinInliningThreshold, 250, JVMFlag::RANGE, 1538 "The minimum invocation count a method needs to have to be " 1539 "inlined"); 1540 FLAG_RANGE( MinInliningThreshold, 0, max_jint); 1541 1542 DEVELOP_FLAG(intx, MethodHistogramCutoff, 100, JVMFlag::DEFAULT, 1543 "The cutoff value for method invocation histogram (+CountCalls)"); 1544 1545 DEVELOP_FLAG(intx, DontYieldALotInterval, 10, JVMFlag::DEFAULT, 1546 "Interval between which yields will be dropped (milliseconds)"); 1547 1548 NOTPROD_FLAG(intx, DeoptimizeALotInterval, 5, JVMFlag::DEFAULT, 1549 "Number of exits until DeoptimizeALot kicks in"); 1550 1551 NOTPROD_FLAG(intx, ZombieALotInterval, 5, JVMFlag::DEFAULT, 1552 "Number of exits until ZombieALot kicks in"); 1553 1554 PRODUCT_FLAG(uintx, MallocMaxTestWords, 0, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 1555 "If non-zero, maximum number of words that malloc/realloc can " 1556 "allocate (for testing only)"); 1557 FLAG_RANGE( MallocMaxTestWords, 0, max_uintx); 1558 1559 PRODUCT_FLAG(intx, TypeProfileWidth, 2, JVMFlag::RANGE, 1560 "Number of receiver types to record in call/cast profile"); 1561 FLAG_RANGE( TypeProfileWidth, 0, 8); 1562 1563 DEVELOP_FLAG(intx, BciProfileWidth, 2, JVMFlag::DEFAULT, 1564 "Number of return bci's to record in ret profile"); 1565 1566 PRODUCT_FLAG(intx, PerMethodRecompilationCutoff, 400, JVMFlag::RANGE, 1567 "After recompiling N times, stay in the interpreter (-1=>'Inf')"); 1568 FLAG_RANGE( PerMethodRecompilationCutoff, -1, max_intx); 1569 1570 PRODUCT_FLAG(intx, PerBytecodeRecompilationCutoff, 200, JVMFlag::RANGE, 1571 "Per-BCI limit on repeated recompilation (-1=>'Inf')"); 1572 FLAG_RANGE( PerBytecodeRecompilationCutoff, -1, max_intx); 1573 1574 PRODUCT_FLAG(intx, PerMethodTrapLimit, 100, JVMFlag::RANGE, 1575 "Limit on traps (of one kind) in a method (includes inlines)"); 1576 FLAG_RANGE( PerMethodTrapLimit, 0, max_jint); 1577 1578 PRODUCT_FLAG(intx, PerMethodSpecTrapLimit, 5000, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 1579 "Limit on speculative traps (of one kind) in a method " 1580 "(includes inlines)"); 1581 FLAG_RANGE( PerMethodSpecTrapLimit, 0, max_jint); 1582 1583 PRODUCT_FLAG(intx, PerBytecodeTrapLimit, 4, JVMFlag::RANGE, 1584 "Limit on traps (of one kind) at a particular BCI"); 1585 FLAG_RANGE( PerBytecodeTrapLimit, 0, max_jint); 1586 1587 PRODUCT_FLAG(intx, SpecTrapLimitExtraEntries, 3, JVMFlag::EXPERIMENTAL, 1588 "Extra method data trap entries for speculation"); 1589 1590 DEVELOP_FLAG(intx, InlineFrequencyRatio, 20, JVMFlag::RANGE, 1591 "Ratio of call site execution to caller method invocation"); 1592 FLAG_RANGE( InlineFrequencyRatio, 0, max_jint); 1593 1594 PRODUCT_FLAG_PD(intx, InlineFrequencyCount, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 1595 "Count of call site execution necessary to trigger frequent " 1596 "inlining"); 1597 FLAG_RANGE( InlineFrequencyCount, 0, max_jint); 1598 1599 DEVELOP_FLAG(intx, InlineThrowCount, 50, JVMFlag::RANGE, 1600 "Force inlining of interpreted methods that throw this often"); 1601 FLAG_RANGE( InlineThrowCount, 0, max_jint); 1602 1603 DEVELOP_FLAG(intx, InlineThrowMaxSize, 200, JVMFlag::RANGE, 1604 "Force inlining of throwing methods smaller than this"); 1605 FLAG_RANGE( InlineThrowMaxSize, 0, max_jint); 1606 1607 DEVELOP_FLAG(intx, ProfilerNodeSize, 1024, JVMFlag::RANGE, 1608 "Size in K to allocate for the Profile Nodes of each thread"); 1609 FLAG_RANGE( ProfilerNodeSize, 0, 1024); 1610 1611 PRODUCT_FLAG_PD(size_t, MetaspaceSize, JVMFlag::CONSTRAINT, 1612 "Initial threshold (in bytes) at which a garbage collection " 1613 "is done to reduce Metaspace usage"); 1614 FLAG_CONSTRAINT( MetaspaceSize, (void*)MetaspaceSizeConstraintFunc, JVMFlag::AfterErgo); 1615 1616 PRODUCT_FLAG(size_t, MaxMetaspaceSize, max_uintx, JVMFlag::CONSTRAINT, 1617 "Maximum size of Metaspaces (in bytes)"); 1618 FLAG_CONSTRAINT( MaxMetaspaceSize, (void*)MaxMetaspaceSizeConstraintFunc, JVMFlag::AfterErgo); 1619 1620 PRODUCT_FLAG(size_t, CompressedClassSpaceSize, 1*G, JVMFlag::RANGE, 1621 "Maximum size of class area in Metaspace when compressed " 1622 "class pointers are used"); 1623 FLAG_RANGE( CompressedClassSpaceSize, 1*M, 3*G); 1624 1625 PRODUCT_FLAG(uintx, MinHeapFreeRatio, 40, JVMFlag::MANAGEABLE | JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1626 "The minimum percentage of heap free after GC to avoid expansion." 1627 " For most GCs this applies to the old generation. In G1 and" 1628 " ParallelGC it applies to the whole heap."); 1629 FLAG_RANGE( MinHeapFreeRatio, 0, 100); 1630 FLAG_CONSTRAINT( MinHeapFreeRatio, (void*)MinHeapFreeRatioConstraintFunc, JVMFlag::AfterErgo); 1631 1632 PRODUCT_FLAG(uintx, MaxHeapFreeRatio, 70, JVMFlag::MANAGEABLE | JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1633 "The maximum percentage of heap free after GC to avoid shrinking." 1634 " For most GCs this applies to the old generation. In G1 and" 1635 " ParallelGC it applies to the whole heap."); 1636 FLAG_RANGE( MaxHeapFreeRatio, 0, 100); 1637 FLAG_CONSTRAINT( MaxHeapFreeRatio, (void*)MaxHeapFreeRatioConstraintFunc, JVMFlag::AfterErgo); 1638 1639 PRODUCT_FLAG(bool, ShrinkHeapInSteps, true, JVMFlag::DEFAULT, 1640 "When disabled, informs the GC to shrink the java heap directly" 1641 " to the target size at the next full GC rather than requiring" 1642 " smaller steps during multiple full GCs."); 1643 1644 PRODUCT_FLAG(intx, SoftRefLRUPolicyMSPerMB, 1000, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1645 "Number of milliseconds per MB of free space in the heap"); 1646 FLAG_RANGE( SoftRefLRUPolicyMSPerMB, 0, max_intx); 1647 FLAG_CONSTRAINT( SoftRefLRUPolicyMSPerMB, (void*)SoftRefLRUPolicyMSPerMBConstraintFunc, JVMFlag::AfterMemoryInit); 1648 1649 PRODUCT_FLAG(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), JVMFlag::RANGE, 1650 "The minimum change in heap space due to GC (in bytes)"); 1651 FLAG_RANGE( MinHeapDeltaBytes, 0, max_uintx); 1652 1653 PRODUCT_FLAG(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), JVMFlag::RANGE, 1654 "The minimum expansion of Metaspace (in bytes)"); 1655 FLAG_RANGE( MinMetaspaceExpansion, 0, max_uintx); 1656 1657 PRODUCT_FLAG(uintx, MaxMetaspaceFreeRatio, 70, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1658 "The maximum percentage of Metaspace free after GC to avoid " 1659 "shrinking"); 1660 FLAG_RANGE( MaxMetaspaceFreeRatio, 0, 100); 1661 FLAG_CONSTRAINT( MaxMetaspaceFreeRatio, (void*)MaxMetaspaceFreeRatioConstraintFunc, JVMFlag::AfterErgo); 1662 1663 PRODUCT_FLAG(uintx, MinMetaspaceFreeRatio, 40, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1664 "The minimum percentage of Metaspace free after GC to avoid " 1665 "expansion"); 1666 FLAG_RANGE( MinMetaspaceFreeRatio, 0, 99); 1667 FLAG_CONSTRAINT( MinMetaspaceFreeRatio, (void*)MinMetaspaceFreeRatioConstraintFunc, JVMFlag::AfterErgo); 1668 1669 PRODUCT_FLAG(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), JVMFlag::RANGE, 1670 "The maximum expansion of Metaspace without full GC (in bytes)"); 1671 FLAG_RANGE( MaxMetaspaceExpansion, 0, max_uintx); 1672 1673 1674 // stack parameters 1675 PRODUCT_FLAG_PD(intx, StackYellowPages, JVMFlag::RANGE, 1676 "Number of yellow zone (recoverable overflows) pages of size " 1677 "4KB. If pages are bigger yellow zone is aligned up."); 1678 FLAG_RANGE( StackYellowPages, MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)); 1679 1680 PRODUCT_FLAG_PD(intx, StackRedPages, JVMFlag::RANGE, 1681 "Number of red zone (unrecoverable overflows) pages of size " 1682 "4KB. If pages are bigger red zone is aligned up."); 1683 FLAG_RANGE( StackRedPages, MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)); 1684 1685 PRODUCT_FLAG_PD(intx, StackReservedPages, JVMFlag::RANGE, 1686 "Number of reserved zone (reserved to annotated methods) pages" 1687 " of size 4KB. If pages are bigger reserved zone is aligned up."); 1688 FLAG_RANGE( StackReservedPages, MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10)); 1689 1690 PRODUCT_FLAG(bool, RestrictReservedStack, true, JVMFlag::DEFAULT, 1691 "Restrict @ReservedStackAccess to trusted classes"); 1692 1693 1694 // greater stack shadow pages can't generate instruction to bang stack 1695 PRODUCT_FLAG_PD(intx, StackShadowPages, JVMFlag::RANGE, 1696 "Number of shadow zone (for overflow checking) pages of size " 1697 "4KB. If pages are bigger shadow zone is aligned up. " 1698 "This should exceed the depth of the VM and native call stack."); 1699 FLAG_RANGE( StackShadowPages, MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)); 1700 1701 PRODUCT_FLAG_PD(intx, ThreadStackSize, JVMFlag::RANGE, 1702 "Thread Stack Size (in Kbytes)"); 1703 FLAG_RANGE( ThreadStackSize, 0, 1 * M); 1704 1705 PRODUCT_FLAG_PD(intx, VMThreadStackSize, JVMFlag::RANGE, 1706 "Non-Java Thread Stack Size (in Kbytes)"); 1707 FLAG_RANGE( VMThreadStackSize, 0, max_intx/(1 * K)); 1708 1709 PRODUCT_FLAG_PD(intx, CompilerThreadStackSize, JVMFlag::RANGE, 1710 "Compiler Thread Stack Size (in Kbytes)"); 1711 FLAG_RANGE( CompilerThreadStackSize, 0, max_intx/(1 * K)); 1712 1713 DEVELOP_FLAG_PD(size_t, JVMInvokeMethodSlack, JVMFlag::DEFAULT, 1714 "Stack space (bytes) required for JVM_InvokeMethod to complete"); 1715 1716 1717 // code cache parameters 1718 DEVELOP_FLAG_PD(uintx, CodeCacheSegmentSize, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1719 "Code cache segment size (in bytes) - smallest unit of " 1720 "allocation"); 1721 FLAG_RANGE( CodeCacheSegmentSize, 1, 1024); 1722 FLAG_CONSTRAINT( CodeCacheSegmentSize, (void*)CodeCacheSegmentSizeConstraintFunc, JVMFlag::AfterErgo); 1723 1724 DEVELOP_FLAG_PD(intx, CodeEntryAlignment, JVMFlag::CONSTRAINT, 1725 "Code entry alignment for generated code (in bytes)"); 1726 FLAG_CONSTRAINT( CodeEntryAlignment, (void*)CodeEntryAlignmentConstraintFunc, JVMFlag::AfterErgo); 1727 1728 PRODUCT_FLAG_PD(intx, OptoLoopAlignment, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1729 "Align inner loops to zero relative to this modulus"); 1730 FLAG_RANGE( OptoLoopAlignment, 1, 16); 1731 FLAG_CONSTRAINT( OptoLoopAlignment, (void*)OptoLoopAlignmentConstraintFunc, JVMFlag::AfterErgo); 1732 1733 PRODUCT_FLAG_PD(uintx, InitialCodeCacheSize, JVMFlag::RANGE, 1734 "Initial code cache size (in bytes)"); 1735 FLAG_CUSTOM_RANGE( InitialCodeCacheSize, VMPageSize); 1736 1737 DEVELOP_FLAG_PD(uintx, CodeCacheMinimumUseSpace, JVMFlag::RANGE, 1738 "Minimum code cache size (in bytes) required to start VM."); 1739 FLAG_RANGE( CodeCacheMinimumUseSpace, 0, max_uintx); 1740 1741 PRODUCT_FLAG(bool, SegmentedCodeCache, false, JVMFlag::DEFAULT, 1742 "Use a segmented code cache"); 1743 1744 PRODUCT_FLAG_PD(uintx, ReservedCodeCacheSize, JVMFlag::RANGE, 1745 "Reserved code cache size (in bytes) - maximum code cache size"); 1746 FLAG_CUSTOM_RANGE( ReservedCodeCacheSize, VMPageSize); 1747 1748 PRODUCT_FLAG_PD(uintx, NonProfiledCodeHeapSize, JVMFlag::RANGE, 1749 "Size of code heap with non-profiled methods (in bytes)"); 1750 FLAG_RANGE( NonProfiledCodeHeapSize, 0, max_uintx); 1751 1752 PRODUCT_FLAG_PD(uintx, ProfiledCodeHeapSize, JVMFlag::RANGE, 1753 "Size of code heap with profiled methods (in bytes)"); 1754 FLAG_RANGE( ProfiledCodeHeapSize, 0, max_uintx); 1755 1756 PRODUCT_FLAG_PD(uintx, NonNMethodCodeHeapSize, JVMFlag::RANGE, 1757 "Size of code heap with non-nmethods (in bytes)"); 1758 FLAG_CUSTOM_RANGE( NonNMethodCodeHeapSize, VMPageSize); 1759 1760 PRODUCT_FLAG_PD(uintx, CodeCacheExpansionSize, JVMFlag::RANGE, 1761 "Code cache expansion size (in bytes)"); 1762 FLAG_RANGE( CodeCacheExpansionSize, 32*K, max_uintx); 1763 1764 PRODUCT_FLAG_PD(uintx, CodeCacheMinBlockLength, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 1765 "Minimum number of segments in a code cache block"); 1766 FLAG_RANGE( CodeCacheMinBlockLength, 1, 100); 1767 1768 NOTPROD_FLAG(bool, ExitOnFullCodeCache, false, JVMFlag::DEFAULT, 1769 "Exit the VM if we fill the code cache"); 1770 1771 PRODUCT_FLAG(bool, UseCodeCacheFlushing, true, JVMFlag::DEFAULT, 1772 "Remove cold/old nmethods from the code cache"); 1773 1774 PRODUCT_FLAG(uintx, StartAggressiveSweepingAt, 10, JVMFlag::RANGE, 1775 "Start aggressive sweeping if X[%] of the code cache is free." 1776 "Segmented code cache: X[%] of the non-profiled heap." 1777 "Non-segmented code cache: X[%] of the total code cache"); 1778 FLAG_RANGE( StartAggressiveSweepingAt, 0, 100); 1779 1780 1781 // AOT parameters 1782 PRODUCT_FLAG(bool, UseAOT, false, JVMFlag::EXPERIMENTAL, 1783 "Use AOT compiled files"); 1784 1785 PRODUCT_FLAG(ccstr, AOTLibrary, NULL, JVMFlag::EXPERIMENTAL | JVMFlag::STRINGLIST, 1786 "AOT library"); 1787 1788 PRODUCT_FLAG(bool, PrintAOT, false, JVMFlag::EXPERIMENTAL, 1789 "Print used AOT klasses and methods"); 1790 1791 NOTPROD_FLAG(bool, PrintAOTStatistics, false, JVMFlag::DEFAULT, 1792 "Print AOT statistics"); 1793 1794 PRODUCT_FLAG(bool, UseAOTStrictLoading, false, JVMFlag::DIAGNOSTIC, 1795 "Exit the VM if any of the AOT libraries has invalid config"); 1796 1797 PRODUCT_FLAG(bool, CalculateClassFingerprint, false, JVMFlag::DEFAULT, 1798 "Calculate class fingerprint"); 1799 1800 1801 // interpreter debugging 1802 DEVELOP_FLAG(intx, BinarySwitchThreshold, 5, JVMFlag::DEFAULT, 1803 "Minimal number of lookupswitch entries for rewriting to binary " 1804 "switch"); 1805 1806 DEVELOP_FLAG(intx, StopInterpreterAt, 0, JVMFlag::DEFAULT, 1807 "Stop interpreter execution at specified bytecode number"); 1808 1809 DEVELOP_FLAG(intx, TraceBytecodesAt, 0, JVMFlag::DEFAULT, 1810 "Trace bytecodes starting with specified bytecode number"); 1811 1812 1813 // compiler interface 1814 DEVELOP_FLAG(intx, CIStart, 0, JVMFlag::DEFAULT, 1815 "The id of the first compilation to permit"); 1816 1817 DEVELOP_FLAG(intx, CIStop, max_jint, JVMFlag::DEFAULT, 1818 "The id of the last compilation to permit"); 1819 1820 DEVELOP_FLAG(intx, CIStartOSR, 0, JVMFlag::DEFAULT, 1821 "The id of the first osr compilation to permit " 1822 "(CICountOSR must be on)"); 1823 1824 DEVELOP_FLAG(intx, CIStopOSR, max_jint, JVMFlag::DEFAULT, 1825 "The id of the last osr compilation to permit " 1826 "(CICountOSR must be on)"); 1827 1828 DEVELOP_FLAG(intx, CIBreakAtOSR, -1, JVMFlag::DEFAULT, 1829 "The id of osr compilation to break at"); 1830 1831 DEVELOP_FLAG(intx, CIBreakAt, -1, JVMFlag::DEFAULT, 1832 "The id of compilation to break at"); 1833 1834 PRODUCT_FLAG(ccstr, CompileOnly, "", JVMFlag::STRINGLIST, 1835 "List of methods (pkg/class.name) to restrict compilation to"); 1836 1837 PRODUCT_FLAG(ccstr, CompileCommandFile, NULL, JVMFlag::DEFAULT, 1838 "Read compiler commands from this file [.hotspot_compiler]"); 1839 1840 PRODUCT_FLAG(ccstr, CompilerDirectivesFile, NULL, JVMFlag::DIAGNOSTIC, 1841 "Read compiler directives from this file"); 1842 1843 PRODUCT_FLAG(ccstr, CompileCommand, "", JVMFlag::STRINGLIST, 1844 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>"); 1845 1846 DEVELOP_FLAG(bool, ReplayCompiles, false, JVMFlag::DEFAULT, 1847 "Enable replay of compilations from ReplayDataFile"); 1848 1849 PRODUCT_FLAG(ccstr, ReplayDataFile, NULL, JVMFlag::DEFAULT, 1850 "File containing compilation replay information" 1851 "[default: ./replay_pid%p.log] (%p replaced with pid)"); 1852 1853 PRODUCT_FLAG(ccstr, InlineDataFile, NULL, JVMFlag::DEFAULT, 1854 "File containing inlining replay information" 1855 "[default: ./inline_pid%p.log] (%p replaced with pid)"); 1856 1857 DEVELOP_FLAG(intx, ReplaySuppressInitializers, 2, JVMFlag::RANGE, 1858 "Control handling of class initialization during replay: " 1859 "0 - don't do anything special; " 1860 "1 - treat all class initializers as empty; " 1861 "2 - treat class initializers for application classes as empty; " 1862 "3 - allow all class initializers to run during bootstrap but " 1863 " pretend they are empty after starting replay"); 1864 FLAG_RANGE( ReplaySuppressInitializers, 0, 3); 1865 1866 DEVELOP_FLAG(bool, ReplayIgnoreInitErrors, false, JVMFlag::DEFAULT, 1867 "Ignore exceptions thrown during initialization for replay"); 1868 1869 PRODUCT_FLAG(bool, DumpReplayDataOnError, true, JVMFlag::DEFAULT, 1870 "Record replay data for crashing compiler threads"); 1871 1872 PRODUCT_FLAG(bool, CICompilerCountPerCPU, false, JVMFlag::DEFAULT, 1873 "1 compiler thread for log(N CPUs)"); 1874 1875 NOTPROD_FLAG(intx, CICrashAt, -1, JVMFlag::DEFAULT, 1876 "id of compilation to trigger assert in compiler thread for " 1877 "the purpose of testing, e.g. generation of replay data"); 1878 1879 NOTPROD_FLAG(bool, CIObjectFactoryVerify, false, JVMFlag::DEFAULT, 1880 "enable potentially expensive verification in ciObjectFactory"); 1881 1882 PRODUCT_FLAG(bool, AbortVMOnCompilationFailure, false, JVMFlag::DIAGNOSTIC, 1883 "Abort VM when method had failed to compile."); 1884 1885 1886 // Priorities 1887 PRODUCT_FLAG_PD(bool, UseThreadPriorities, JVMFlag::DEFAULT, 1888 "Use native thread priorities"); 1889 1890 PRODUCT_FLAG(intx, ThreadPriorityPolicy, 0, JVMFlag::RANGE, 1891 "0 : Normal. " 1892 " VM chooses priorities that are appropriate for normal " 1893 " applications. On Solaris NORM_PRIORITY and above are mapped " 1894 " to normal native priority. Java priorities below " 1895 " NORM_PRIORITY map to lower native priority values. On " 1896 " Windows applications are allowed to use higher native " 1897 " priorities. However, with ThreadPriorityPolicy=0, VM will " 1898 " not use the highest possible native priority, " 1899 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with " 1900 " system threads. On Linux thread priorities are ignored " 1901 " because the OS does not support static priority in " 1902 " SCHED_OTHER scheduling class which is the only choice for " 1903 " non-root, non-realtime applications. " 1904 "1 : Aggressive. " 1905 " Java thread priorities map over to the entire range of " 1906 " native thread priorities. Higher Java thread priorities map " 1907 " to higher native thread priorities. This policy should be " 1908 " used with care, as sometimes it can cause performance " 1909 " degradation in the application and/or the entire system. On " 1910 " Linux/BSD/macOS this policy requires root privilege or an " 1911 " extended capability."); 1912 FLAG_RANGE( ThreadPriorityPolicy, 0, 1); 1913 1914 PRODUCT_FLAG(bool, ThreadPriorityVerbose, false, JVMFlag::DEFAULT, 1915 "Print priority changes"); 1916 1917 PRODUCT_FLAG(intx, CompilerThreadPriority, -1, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 1918 "The native priority at which compiler threads should run " 1919 "(-1 means no change)"); 1920 FLAG_RANGE( CompilerThreadPriority, min_jint, max_jint); 1921 FLAG_CONSTRAINT( CompilerThreadPriority, (void*)CompilerThreadPriorityConstraintFunc, JVMFlag::AfterErgo); 1922 1923 PRODUCT_FLAG(intx, VMThreadPriority, -1, JVMFlag::RANGE, 1924 "The native priority at which the VM thread should run " 1925 "(-1 means no change)"); 1926 FLAG_RANGE( VMThreadPriority, -1, 127); 1927 1928 PRODUCT_FLAG(intx, JavaPriority1_To_OSPriority, -1, JVMFlag::RANGE, 1929 "Map Java priorities to OS priorities"); 1930 FLAG_RANGE( JavaPriority1_To_OSPriority, -1, 127); 1931 1932 PRODUCT_FLAG(intx, JavaPriority2_To_OSPriority, -1, JVMFlag::RANGE, 1933 "Map Java priorities to OS priorities"); 1934 FLAG_RANGE( JavaPriority2_To_OSPriority, -1, 127); 1935 1936 PRODUCT_FLAG(intx, JavaPriority3_To_OSPriority, -1, JVMFlag::RANGE, 1937 "Map Java priorities to OS priorities"); 1938 FLAG_RANGE( JavaPriority3_To_OSPriority, -1, 127); 1939 1940 PRODUCT_FLAG(intx, JavaPriority4_To_OSPriority, -1, JVMFlag::RANGE, 1941 "Map Java priorities to OS priorities"); 1942 FLAG_RANGE( JavaPriority4_To_OSPriority, -1, 127); 1943 1944 PRODUCT_FLAG(intx, JavaPriority5_To_OSPriority, -1, JVMFlag::RANGE, 1945 "Map Java priorities to OS priorities"); 1946 FLAG_RANGE( JavaPriority5_To_OSPriority, -1, 127); 1947 1948 PRODUCT_FLAG(intx, JavaPriority6_To_OSPriority, -1, JVMFlag::RANGE, 1949 "Map Java priorities to OS priorities"); 1950 FLAG_RANGE( JavaPriority6_To_OSPriority, -1, 127); 1951 1952 PRODUCT_FLAG(intx, JavaPriority7_To_OSPriority, -1, JVMFlag::RANGE, 1953 "Map Java priorities to OS priorities"); 1954 FLAG_RANGE( JavaPriority7_To_OSPriority, -1, 127); 1955 1956 PRODUCT_FLAG(intx, JavaPriority8_To_OSPriority, -1, JVMFlag::RANGE, 1957 "Map Java priorities to OS priorities"); 1958 FLAG_RANGE( JavaPriority8_To_OSPriority, -1, 127); 1959 1960 PRODUCT_FLAG(intx, JavaPriority9_To_OSPriority, -1, JVMFlag::RANGE, 1961 "Map Java priorities to OS priorities"); 1962 FLAG_RANGE( JavaPriority9_To_OSPriority, -1, 127); 1963 1964 PRODUCT_FLAG(intx, JavaPriority10_To_OSPriority, -1, JVMFlag::RANGE, 1965 "Map Java priorities to OS priorities"); 1966 FLAG_RANGE( JavaPriority10_To_OSPriority, -1, 127); 1967 1968 PRODUCT_FLAG(bool, UseCriticalJavaThreadPriority, false, JVMFlag::EXPERIMENTAL, 1969 "Java thread priority 10 maps to critical scheduling priority"); 1970 1971 PRODUCT_FLAG(bool, UseCriticalCompilerThreadPriority, false, JVMFlag::EXPERIMENTAL, 1972 "Compiler thread(s) run at critical scheduling priority"); 1973 1974 DEVELOP_FLAG(intx, NewCodeParameter, 0, JVMFlag::DEFAULT, 1975 "Testing Only: Create a dedicated integer parameter before " 1976 "putback"); 1977 1978 1979 // new oopmap storage allocation 1980 DEVELOP_FLAG(intx, MinOopMapAllocation, 8, JVMFlag::DEFAULT, 1981 "Minimum number of OopMap entries in an OopMapSet"); 1982 1983 1984 // Background Compilation 1985 DEVELOP_FLAG(intx, LongCompileThreshold, 50, JVMFlag::DEFAULT, 1986 "Used with +TraceLongCompiles"); 1987 1988 1989 // recompilation 1990 PRODUCT_FLAG_PD(intx, CompileThreshold, JVMFlag::CONSTRAINT, 1991 "number of interpreted method invocations before (re-)compiling"); 1992 FLAG_CONSTRAINT( CompileThreshold, (void*)CompileThresholdConstraintFunc, JVMFlag::AfterErgo); 1993 1994 PRODUCT_FLAG(double, CompileThresholdScaling, 1.0, JVMFlag::RANGE, 1995 "Factor to control when first compilation happens " 1996 "(both with and without tiered compilation): " 1997 "values greater than 1.0 delay counter overflow, " 1998 "values between 0 and 1.0 rush counter overflow, " 1999 "value of 1.0 leaves compilation thresholds unchanged " 2000 "value of 0.0 is equivalent to -Xint. " 2001 "" 2002 "Flag can be set as per-method option. " 2003 "If a value is specified for a method, compilation thresholds " 2004 "for that method are scaled by both the value of the global flag " 2005 "and the value of the per-method flag."); 2006 FLAG_RANGE( CompileThresholdScaling, 0.0, DBL_MAX); 2007 2008 PRODUCT_FLAG(intx, Tier0InvokeNotifyFreqLog, 7, JVMFlag::RANGE, 2009 "Interpreter (tier 0) invocation notification frequency"); 2010 FLAG_RANGE( Tier0InvokeNotifyFreqLog, 0, 30); 2011 2012 PRODUCT_FLAG(intx, Tier2InvokeNotifyFreqLog, 11, JVMFlag::RANGE, 2013 "C1 without MDO (tier 2) invocation notification frequency"); 2014 FLAG_RANGE( Tier2InvokeNotifyFreqLog, 0, 30); 2015 2016 PRODUCT_FLAG(intx, Tier3InvokeNotifyFreqLog, 10, JVMFlag::RANGE, 2017 "C1 with MDO profiling (tier 3) invocation notification " 2018 "frequency"); 2019 FLAG_RANGE( Tier3InvokeNotifyFreqLog, 0, 30); 2020 2021 PRODUCT_FLAG(intx, Tier23InlineeNotifyFreqLog, 20, JVMFlag::RANGE, 2022 "Inlinee invocation (tiers 2 and 3) notification frequency"); 2023 FLAG_RANGE( Tier23InlineeNotifyFreqLog, 0, 30); 2024 2025 PRODUCT_FLAG(intx, Tier0BackedgeNotifyFreqLog, 10, JVMFlag::RANGE, 2026 "Interpreter (tier 0) invocation notification frequency"); 2027 FLAG_RANGE( Tier0BackedgeNotifyFreqLog, 0, 30); 2028 2029 PRODUCT_FLAG(intx, Tier2BackedgeNotifyFreqLog, 14, JVMFlag::RANGE, 2030 "C1 without MDO (tier 2) invocation notification frequency"); 2031 FLAG_RANGE( Tier2BackedgeNotifyFreqLog, 0, 30); 2032 2033 PRODUCT_FLAG(intx, Tier3BackedgeNotifyFreqLog, 13, JVMFlag::RANGE, 2034 "C1 with MDO profiling (tier 3) invocation notification " 2035 "frequency"); 2036 FLAG_RANGE( Tier3BackedgeNotifyFreqLog, 0, 30); 2037 2038 PRODUCT_FLAG(intx, Tier2CompileThreshold, 0, JVMFlag::RANGE, 2039 "threshold at which tier 2 compilation is invoked"); 2040 FLAG_RANGE( Tier2CompileThreshold, 0, max_jint); 2041 2042 PRODUCT_FLAG(intx, Tier2BackEdgeThreshold, 0, JVMFlag::RANGE, 2043 "Back edge threshold at which tier 2 compilation is invoked"); 2044 FLAG_RANGE( Tier2BackEdgeThreshold, 0, max_jint); 2045 2046 PRODUCT_FLAG(intx, Tier3InvocationThreshold, 200, JVMFlag::RANGE, 2047 "Compile if number of method invocations crosses this " 2048 "threshold"); 2049 FLAG_RANGE( Tier3InvocationThreshold, 0, max_jint); 2050 2051 PRODUCT_FLAG(intx, Tier3MinInvocationThreshold, 100, JVMFlag::RANGE, 2052 "Minimum invocation to compile at tier 3"); 2053 FLAG_RANGE( Tier3MinInvocationThreshold, 0, max_jint); 2054 2055 PRODUCT_FLAG(intx, Tier3CompileThreshold, 2000, JVMFlag::RANGE, 2056 "Threshold at which tier 3 compilation is invoked (invocation " 2057 "minimum must be satisfied)"); 2058 FLAG_RANGE( Tier3CompileThreshold, 0, max_jint); 2059 2060 PRODUCT_FLAG(intx, Tier3BackEdgeThreshold, 60000, JVMFlag::RANGE, 2061 "Back edge threshold at which tier 3 OSR compilation is invoked"); 2062 FLAG_RANGE( Tier3BackEdgeThreshold, 0, max_jint); 2063 2064 PRODUCT_FLAG(intx, Tier3AOTInvocationThreshold, 10000, JVMFlag::RANGE, 2065 "Compile if number of method invocations crosses this " 2066 "threshold if coming from AOT"); 2067 FLAG_RANGE( Tier3AOTInvocationThreshold, 0, max_jint); 2068 2069 PRODUCT_FLAG(intx, Tier3AOTMinInvocationThreshold, 1000, JVMFlag::RANGE, 2070 "Minimum invocation to compile at tier 3 if coming from AOT"); 2071 FLAG_RANGE( Tier3AOTMinInvocationThreshold, 0, max_jint); 2072 2073 PRODUCT_FLAG(intx, Tier3AOTCompileThreshold, 15000, JVMFlag::RANGE, 2074 "Threshold at which tier 3 compilation is invoked (invocation " 2075 "minimum must be satisfied) if coming from AOT"); 2076 FLAG_RANGE( Tier3AOTCompileThreshold, 0, max_jint); 2077 2078 PRODUCT_FLAG(intx, Tier3AOTBackEdgeThreshold, 120000, JVMFlag::RANGE, 2079 "Back edge threshold at which tier 3 OSR compilation is invoked " 2080 "if coming from AOT"); 2081 FLAG_RANGE( Tier3AOTBackEdgeThreshold, 0, max_jint); 2082 2083 PRODUCT_FLAG(intx, Tier0AOTInvocationThreshold, 200, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2084 "Switch to interpreter to profile if the number of method " 2085 "invocations crosses this threshold if coming from AOT " 2086 "(applicable only with " 2087 "CompilationMode=high-only|high-only-quick-internal)"); 2088 FLAG_RANGE( Tier0AOTInvocationThreshold, 0, max_jint); 2089 2090 PRODUCT_FLAG(intx, Tier0AOTMinInvocationThreshold, 100, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2091 "Minimum number of invocations to switch to interpreter " 2092 "to profile if coming from AOT " 2093 "(applicable only with " 2094 "CompilationMode=high-only|high-only-quick-internal)"); 2095 FLAG_RANGE( Tier0AOTMinInvocationThreshold, 0, max_jint); 2096 2097 PRODUCT_FLAG(intx, Tier0AOTCompileThreshold, 2000, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2098 "Threshold at which to switch to interpreter to profile " 2099 "if coming from AOT " 2100 "(invocation minimum must be satisfied, " 2101 "applicable only with " 2102 "CompilationMode=high-only|high-only-quick-internal)"); 2103 FLAG_RANGE( Tier0AOTCompileThreshold, 0, max_jint); 2104 2105 PRODUCT_FLAG(intx, Tier0AOTBackEdgeThreshold, 60000, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2106 "Back edge threshold at which to switch to interpreter " 2107 "to profile if coming from AOT " 2108 "(applicable only with " 2109 "CompilationMode=high-only|high-only-quick-internal)"); 2110 FLAG_RANGE( Tier0AOTBackEdgeThreshold, 0, max_jint); 2111 2112 PRODUCT_FLAG(intx, Tier4InvocationThreshold, 5000, JVMFlag::RANGE, 2113 "Compile if number of method invocations crosses this " 2114 "threshold"); 2115 FLAG_RANGE( Tier4InvocationThreshold, 0, max_jint); 2116 2117 PRODUCT_FLAG(intx, Tier4MinInvocationThreshold, 600, JVMFlag::RANGE, 2118 "Minimum invocation to compile at tier 4"); 2119 FLAG_RANGE( Tier4MinInvocationThreshold, 0, max_jint); 2120 2121 PRODUCT_FLAG(intx, Tier4CompileThreshold, 15000, JVMFlag::RANGE, 2122 "Threshold at which tier 4 compilation is invoked (invocation " 2123 "minimum must be satisfied)"); 2124 FLAG_RANGE( Tier4CompileThreshold, 0, max_jint); 2125 2126 PRODUCT_FLAG(intx, Tier4BackEdgeThreshold, 40000, JVMFlag::RANGE, 2127 "Back edge threshold at which tier 4 OSR compilation is invoked"); 2128 FLAG_RANGE( Tier4BackEdgeThreshold, 0, max_jint); 2129 2130 PRODUCT_FLAG(intx, Tier40InvocationThreshold, 5000, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2131 "Compile if number of method invocations crosses this " 2132 "threshold (applicable only with " 2133 "CompilationMode=high-only|high-only-quick-internal)"); 2134 FLAG_RANGE( Tier40InvocationThreshold, 0, max_jint); 2135 2136 PRODUCT_FLAG(intx, Tier40MinInvocationThreshold, 600, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2137 "Minimum number of invocations to compile at tier 4 " 2138 "(applicable only with " 2139 "CompilationMode=high-only|high-only-quick-internal)"); 2140 FLAG_RANGE( Tier40MinInvocationThreshold, 0, max_jint); 2141 2142 PRODUCT_FLAG(intx, Tier40CompileThreshold, 10000, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2143 "Threshold at which tier 4 compilation is invoked (invocation " 2144 "minimum must be satisfied, applicable only with " 2145 "CompilationMode=high-only|high-only-quick-internal)"); 2146 FLAG_RANGE( Tier40CompileThreshold, 0, max_jint); 2147 2148 PRODUCT_FLAG(intx, Tier40BackEdgeThreshold, 15000, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2149 "Back edge threshold at which tier 4 OSR compilation is invoked " 2150 "(applicable only with " 2151 "CompilationMode=high-only|high-only-quick-internal)"); 2152 FLAG_RANGE( Tier40BackEdgeThreshold, 0, max_jint); 2153 2154 PRODUCT_FLAG(intx, Tier0Delay, 5, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2155 "If C2 queue size grows over this amount per compiler thread " 2156 "do not start profiling in the interpreter " 2157 "(applicable only with " 2158 "CompilationMode=high-only|high-only-quick-internal)"); 2159 FLAG_RANGE( Tier0Delay, 0, max_jint); 2160 2161 PRODUCT_FLAG(intx, Tier3DelayOn, 5, JVMFlag::RANGE, 2162 "If C2 queue size grows over this amount per compiler thread " 2163 "stop compiling at tier 3 and start compiling at tier 2"); 2164 FLAG_RANGE( Tier3DelayOn, 0, max_jint); 2165 2166 PRODUCT_FLAG(intx, Tier3DelayOff, 2, JVMFlag::RANGE, 2167 "If C2 queue size is less than this amount per compiler thread " 2168 "allow methods compiled at tier 2 transition to tier 3"); 2169 FLAG_RANGE( Tier3DelayOff, 0, max_jint); 2170 2171 PRODUCT_FLAG(intx, Tier3LoadFeedback, 5, JVMFlag::RANGE, 2172 "Tier 3 thresholds will increase twofold when C1 queue size " 2173 "reaches this amount per compiler thread"); 2174 FLAG_RANGE( Tier3LoadFeedback, 0, max_jint); 2175 2176 PRODUCT_FLAG(intx, Tier4LoadFeedback, 3, JVMFlag::RANGE, 2177 "Tier 4 thresholds will increase twofold when C2 queue size " 2178 "reaches this amount per compiler thread"); 2179 FLAG_RANGE( Tier4LoadFeedback, 0, max_jint); 2180 2181 PRODUCT_FLAG(intx, TieredCompileTaskTimeout, 50, JVMFlag::RANGE, 2182 "Kill compile task if method was not used within " 2183 "given timeout in milliseconds"); 2184 FLAG_RANGE( TieredCompileTaskTimeout, 0, max_intx); 2185 2186 PRODUCT_FLAG(intx, TieredStopAtLevel, 4, JVMFlag::RANGE, 2187 "Stop at given compilation level"); 2188 FLAG_RANGE( TieredStopAtLevel, 0, 4); 2189 2190 PRODUCT_FLAG(intx, Tier0ProfilingStartPercentage, 200, JVMFlag::RANGE, 2191 "Start profiling in interpreter if the counters exceed tier 3 " 2192 "thresholds (tier 4 thresholds with " 2193 "CompilationMode=high-only|high-only-quick-internal)" 2194 "by the specified percentage"); 2195 FLAG_RANGE( Tier0ProfilingStartPercentage, 0, max_jint); 2196 2197 PRODUCT_FLAG(uintx, IncreaseFirstTierCompileThresholdAt, 50, JVMFlag::RANGE, 2198 "Increase the compile threshold for C1 compilation if the code " 2199 "cache is filled by the specified percentage"); 2200 FLAG_RANGE( IncreaseFirstTierCompileThresholdAt, 0, 99); 2201 2202 PRODUCT_FLAG(intx, TieredRateUpdateMinTime, 1, JVMFlag::RANGE, 2203 "Minimum rate sampling interval (in milliseconds)"); 2204 FLAG_RANGE( TieredRateUpdateMinTime, 0, max_intx); 2205 2206 PRODUCT_FLAG(intx, TieredRateUpdateMaxTime, 25, JVMFlag::RANGE, 2207 "Maximum rate sampling interval (in milliseconds)"); 2208 FLAG_RANGE( TieredRateUpdateMaxTime, 0, max_intx); 2209 2210 PRODUCT_FLAG(ccstr, CompilationMode, "default", JVMFlag::DEFAULT, 2211 "Compilation modes: " 2212 "default: normal tiered compilation; " 2213 "quick-only: C1-only mode; " 2214 "high-only: C2/JVMCI-only mode; " 2215 "high-only-quick-internal: C2/JVMCI-only mode, " 2216 "with JVMCI compiler compiled with C1."); 2217 2218 PRODUCT_FLAG_PD(bool, TieredCompilation, JVMFlag::DEFAULT, 2219 "Enable tiered compilation"); 2220 2221 PRODUCT_FLAG(bool, PrintTieredEvents, false, JVMFlag::DEFAULT, 2222 "Print tiered events notifications"); 2223 2224 PRODUCT_FLAG_PD(intx, OnStackReplacePercentage, JVMFlag::CONSTRAINT, 2225 "NON_TIERED number of method invocations/branches (expressed as " 2226 "% of CompileThreshold) before (re-)compiling OSR code"); 2227 FLAG_CONSTRAINT( OnStackReplacePercentage, (void*)OnStackReplacePercentageConstraintFunc, JVMFlag::AfterErgo); 2228 2229 PRODUCT_FLAG(intx, InterpreterProfilePercentage, 33, JVMFlag::RANGE, 2230 "NON_TIERED number of method invocations/branches (expressed as " 2231 "% of CompileThreshold) before profiling in the interpreter"); 2232 FLAG_RANGE( InterpreterProfilePercentage, 0, 100); 2233 2234 DEVELOP_FLAG(intx, DesiredMethodLimit, 8000, JVMFlag::DEFAULT, 2235 "The desired maximum method size (in bytecodes) after inlining"); 2236 2237 DEVELOP_FLAG(intx, HugeMethodLimit, 8000, JVMFlag::DEFAULT, 2238 "Don't compile methods larger than this if " 2239 "+DontCompileHugeMethods"); 2240 2241 2242 // Properties for Java libraries 2243 PRODUCT_FLAG(uint64_t, MaxDirectMemorySize, 0, JVMFlag::RANGE, 2244 "Maximum total size of NIO direct-buffer allocations"); 2245 FLAG_RANGE( MaxDirectMemorySize, 0, max_jlong); 2246 2247 2248 // Flags used for temporary code during development 2249 PRODUCT_FLAG(bool, UseNewCode, false, JVMFlag::DIAGNOSTIC, 2250 "Testing Only: Use the new version while testing"); 2251 2252 PRODUCT_FLAG(bool, UseNewCode2, false, JVMFlag::DIAGNOSTIC, 2253 "Testing Only: Use the new version while testing"); 2254 2255 PRODUCT_FLAG(bool, UseNewCode3, false, JVMFlag::DIAGNOSTIC, 2256 "Testing Only: Use the new version while testing"); 2257 2258 2259 // flags for performance data collection 2260 PRODUCT_FLAG(bool, UsePerfData, true, JVMFlag::DEFAULT, 2261 "Flag to disable jvmstat instrumentation for performance testing " 2262 "and problem isolation purposes"); 2263 2264 PRODUCT_FLAG(bool, PerfDataSaveToFile, false, JVMFlag::DEFAULT, 2265 "Save PerfData memory to hsperfdata_<pid> file on exit"); 2266 2267 PRODUCT_FLAG(ccstr, PerfDataSaveFile, NULL, JVMFlag::DEFAULT, 2268 "Save PerfData memory to the specified absolute pathname. " 2269 "The string %p in the file name (if present) " 2270 "will be replaced by pid"); 2271 2272 PRODUCT_FLAG(intx, PerfDataSamplingInterval, 50, JVMFlag::RANGE | JVMFlag::CONSTRAINT, 2273 "Data sampling interval (in milliseconds)"); 2274 //TODO: to avoid circular dependency, the min/max cannot be declared in header file 2275 //FLAG_RANGE( PerfDataSamplingInterval, PeriodicTask::min_interval, max_jint); 2276 FLAG_CONSTRAINT( PerfDataSamplingInterval, (void*)PerfDataSamplingIntervalFunc, JVMFlag::AfterErgo); 2277 2278 PRODUCT_FLAG(bool, PerfDisableSharedMem, false, JVMFlag::DEFAULT, 2279 "Store performance data in standard memory"); 2280 2281 PRODUCT_FLAG(intx, PerfDataMemorySize, 32*K, JVMFlag::RANGE, 2282 "Size of performance data memory region. Will be rounded " 2283 "up to a multiple of the native os page size."); 2284 FLAG_RANGE( PerfDataMemorySize, 128, 32*64*K); 2285 2286 PRODUCT_FLAG(intx, PerfMaxStringConstLength, 1024, JVMFlag::RANGE, 2287 "Maximum PerfStringConstant string length before truncation"); 2288 FLAG_RANGE( PerfMaxStringConstLength, 32, 32*K); 2289 2290 PRODUCT_FLAG(bool, PerfAllowAtExitRegistration, false, JVMFlag::DEFAULT, 2291 "Allow registration of atexit() methods"); 2292 2293 PRODUCT_FLAG(bool, PerfBypassFileSystemCheck, false, JVMFlag::DEFAULT, 2294 "Bypass Win32 file system criteria checks (Windows Only)"); 2295 2296 PRODUCT_FLAG(intx, UnguardOnExecutionViolation, 0, JVMFlag::RANGE, 2297 "Unguard page and retry on no-execute fault (Win32 only) " 2298 "0=off, 1=conservative, 2=aggressive"); 2299 FLAG_RANGE( UnguardOnExecutionViolation, 0, 2); 2300 2301 2302 // Serviceability Support 2303 PRODUCT_FLAG(bool, ManagementServer, false, JVMFlag::DEFAULT, 2304 "Create JMX Management Server"); 2305 2306 PRODUCT_FLAG(bool, DisableAttachMechanism, false, JVMFlag::DEFAULT, 2307 "Disable mechanism that allows tools to attach to this VM"); 2308 2309 PRODUCT_FLAG(bool, StartAttachListener, false, JVMFlag::DEFAULT, 2310 "Always start Attach Listener at VM startup"); 2311 2312 PRODUCT_FLAG(bool, EnableDynamicAgentLoading, true, JVMFlag::DEFAULT, 2313 "Allow tools to load agents with the attach mechanism"); 2314 2315 PRODUCT_FLAG(bool, PrintConcurrentLocks, false, JVMFlag::MANAGEABLE, 2316 "Print java.util.concurrent locks in thread dump"); 2317 2318 2319 // Shared spaces 2320 PRODUCT_FLAG(bool, UseSharedSpaces, true, JVMFlag::DEFAULT, 2321 "Use shared spaces for metadata"); 2322 2323 PRODUCT_FLAG(bool, VerifySharedSpaces, false, JVMFlag::DEFAULT, 2324 "Verify integrity of shared spaces"); 2325 2326 PRODUCT_FLAG(bool, RequireSharedSpaces, false, JVMFlag::DEFAULT, 2327 "Require shared spaces for metadata"); 2328 2329 PRODUCT_FLAG(bool, DumpSharedSpaces, false, JVMFlag::DEFAULT, 2330 "Special mode: JVM reads a class list, loads classes, builds " 2331 "shared spaces, and dumps the shared spaces to a file to be " 2332 "used in future JVM runs"); 2333 2334 PRODUCT_FLAG(bool, DynamicDumpSharedSpaces, false, JVMFlag::DEFAULT, 2335 "Dynamic archive"); 2336 2337 PRODUCT_FLAG(bool, PrintSharedArchiveAndExit, false, JVMFlag::DEFAULT, 2338 "Print shared archive file contents"); 2339 2340 PRODUCT_FLAG(bool, PrintSharedDictionary, false, JVMFlag::DEFAULT, 2341 "If PrintSharedArchiveAndExit is true, also print the shared " 2342 "dictionary"); 2343 2344 PRODUCT_FLAG(size_t, SharedBaseAddress, LP64_ONLY(32*G)NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), JVMFlag::RANGE, 2345 "Address to allocate shared memory region for class data"); 2346 FLAG_RANGE( SharedBaseAddress, 0, SIZE_MAX); 2347 2348 PRODUCT_FLAG(ccstr, SharedArchiveConfigFile, NULL, JVMFlag::DEFAULT, 2349 "Data to add to the CDS archive file"); 2350 2351 PRODUCT_FLAG(uintx, SharedSymbolTableBucketSize, 4, JVMFlag::RANGE, 2352 "Average number of symbols per bucket in shared table"); 2353 FLAG_RANGE( SharedSymbolTableBucketSize, 2, 246); 2354 2355 PRODUCT_FLAG(bool, AllowArchivingWithJavaAgent, false, JVMFlag::DIAGNOSTIC, 2356 "Allow Java agent to be run with CDS dumping"); 2357 2358 PRODUCT_FLAG(bool, PrintMethodHandleStubs, false, JVMFlag::DIAGNOSTIC, 2359 "Print generated stub code for method handles"); 2360 2361 DEVELOP_FLAG(bool, TraceMethodHandles, false, JVMFlag::DEFAULT, 2362 "trace internal method handle operations"); 2363 2364 PRODUCT_FLAG(bool, VerifyMethodHandles, trueInDebug, JVMFlag::DIAGNOSTIC, 2365 "perform extra checks when constructing method handles"); 2366 2367 PRODUCT_FLAG(bool, ShowHiddenFrames, false, JVMFlag::DIAGNOSTIC, 2368 "show method handle implementation frames (usually hidden)"); 2369 2370 PRODUCT_FLAG(bool, TrustFinalNonStaticFields, false, JVMFlag::EXPERIMENTAL, 2371 "trust final non-static declarations for constant folding"); 2372 2373 PRODUCT_FLAG(bool, FoldStableValues, true, JVMFlag::DIAGNOSTIC, 2374 "Optimize loads from stable fields (marked w/ @Stable)"); 2375 2376 DEVELOP_FLAG(bool, TraceInvokeDynamic, false, JVMFlag::DEFAULT, 2377 "trace internal invoke dynamic operations"); 2378 2379 PRODUCT_FLAG(int, UseBootstrapCallInfo, 1, JVMFlag::DIAGNOSTIC, 2380 "0: when resolving InDy or ConDy, force all BSM arguments to be " 2381 "resolved before the bootstrap method is called; 1: when a BSM " 2382 "that may accept a BootstrapCallInfo is detected, use that API " 2383 "to pass BSM arguments, which allows the BSM to delay their " 2384 "resolution; 2+: stress test the BCI API by calling more BSMs " 2385 "via that API, instead of with the eagerly-resolved array."); 2386 2387 PRODUCT_FLAG(bool, PauseAtStartup, false, JVMFlag::DIAGNOSTIC, 2388 "Causes the VM to pause at startup time and wait for the pause " 2389 "file to be removed (default: ./vm.paused.<pid>)"); 2390 2391 PRODUCT_FLAG(ccstr, PauseAtStartupFile, NULL, JVMFlag::DIAGNOSTIC, 2392 "The file to create and for whose removal to await when pausing " 2393 "at startup. (default: ./vm.paused.<pid>)"); 2394 2395 PRODUCT_FLAG(bool, PauseAtExit, false, JVMFlag::DIAGNOSTIC, 2396 "Pause and wait for keypress on exit if a debugger is attached"); 2397 2398 PRODUCT_FLAG(bool, ExtendedDTraceProbes, false, JVMFlag::DEFAULT, 2399 "Enable performance-impacting dtrace probes"); 2400 2401 PRODUCT_FLAG(bool, DTraceMethodProbes, false, JVMFlag::DEFAULT, 2402 "Enable dtrace probes for method-entry and method-exit"); 2403 2404 PRODUCT_FLAG(bool, DTraceAllocProbes, false, JVMFlag::DEFAULT, 2405 "Enable dtrace probes for object allocation"); 2406 2407 PRODUCT_FLAG(bool, DTraceMonitorProbes, false, JVMFlag::DEFAULT, 2408 "Enable dtrace probes for monitor events"); 2409 2410 PRODUCT_FLAG(bool, RelaxAccessControlCheck, false, JVMFlag::DEFAULT, 2411 "Relax the access control checks in the verifier"); 2412 2413 PRODUCT_FLAG(uintx, StringTableSize, defaultStringTableSize, JVMFlag::RANGE, 2414 "Number of buckets in the interned String table " 2415 "(will be rounded to nearest higher power of 2)"); 2416 FLAG_RANGE( StringTableSize, minimumStringTableSize, 16777216ul); 2417 2418 PRODUCT_FLAG(uintx, SymbolTableSize, defaultSymbolTableSize, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE, 2419 "Number of buckets in the JVM internal Symbol table"); 2420 FLAG_RANGE( SymbolTableSize, minimumSymbolTableSize, 16777216ul); 2421 2422 PRODUCT_FLAG(bool, UseStringDeduplication, false, JVMFlag::DEFAULT, 2423 "Use string deduplication"); 2424 2425 PRODUCT_FLAG(uintx, StringDeduplicationAgeThreshold, 3, JVMFlag::RANGE, 2426 "A string must reach this age (or be promoted to an old region) " 2427 "to be considered for deduplication"); 2428 //TODO: to avoid circular dependency, the min/max cannot be declared in header file 2429 //FLAG_RANGE( StringDeduplicationAgeThreshold, 1, markWord::max_age); 2430 2431 PRODUCT_FLAG(bool, StringDeduplicationResizeALot, false, JVMFlag::DIAGNOSTIC, 2432 "Force table resize every time the table is scanned"); 2433 2434 PRODUCT_FLAG(bool, StringDeduplicationRehashALot, false, JVMFlag::DIAGNOSTIC, 2435 "Force table rehash every time the table is scanned"); 2436 2437 PRODUCT_FLAG(bool, WhiteBoxAPI, false, JVMFlag::DIAGNOSTIC, 2438 "Enable internal testing APIs"); 2439 2440 PRODUCT_FLAG(intx, SurvivorAlignmentInBytes, 0, JVMFlag::EXPERIMENTAL | JVMFlag::RANGE | JVMFlag::CONSTRAINT, 2441 "Default survivor space alignment in bytes"); 2442 FLAG_RANGE( SurvivorAlignmentInBytes, 8, 256); 2443 FLAG_CONSTRAINT( SurvivorAlignmentInBytes, (void*)SurvivorAlignmentInBytesConstraintFunc, JVMFlag::AfterErgo); 2444 2445 PRODUCT_FLAG(ccstr, DumpLoadedClassList, NULL, JVMFlag::DEFAULT, 2446 "Dump the names all loaded classes, that could be stored into " 2447 "the CDS archive, in the specified file"); 2448 2449 PRODUCT_FLAG(ccstr, SharedClassListFile, NULL, JVMFlag::DEFAULT, 2450 "Override the default CDS class list"); 2451 2452 PRODUCT_FLAG(ccstr, SharedArchiveFile, NULL, JVMFlag::DEFAULT, 2453 "Override the default location of the CDS archive file"); 2454 2455 PRODUCT_FLAG(ccstr, ArchiveClassesAtExit, NULL, JVMFlag::DEFAULT, 2456 "The path and name of the dynamic archive file"); 2457 2458 PRODUCT_FLAG(ccstr, ExtraSharedClassListFile, NULL, JVMFlag::DEFAULT, 2459 "Extra classlist for building the CDS archive file"); 2460 2461 PRODUCT_FLAG(intx, ArchiveRelocationMode, 0, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE, 2462 "(0) first map at preferred address, and if " 2463 "unsuccessful, map at alternative address (default); " 2464 "(1) always map at alternative address; " 2465 "(2) always map at preferred address, and if unsuccessful, " 2466 "do not map the archive"); 2467 FLAG_RANGE( ArchiveRelocationMode, 0, 2); 2468 2469 PRODUCT_FLAG(size_t, ArrayAllocatorMallocLimit, SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), JVMFlag::EXPERIMENTAL, 2470 "Allocation less than this value will be allocated " 2471 "using malloc. Larger allocations will use mmap."); 2472 2473 PRODUCT_FLAG(bool, AlwaysAtomicAccesses, false, JVMFlag::EXPERIMENTAL, 2474 "Accesses to all variables should always be atomic"); 2475 2476 PRODUCT_FLAG(bool, UseUnalignedAccesses, false, JVMFlag::DIAGNOSTIC, 2477 "Use unaligned memory accesses in Unsafe"); 2478 2479 PRODUCT_FLAG_PD(bool, PreserveFramePointer, JVMFlag::DEFAULT, 2480 "Use the FP register for holding the frame pointer " 2481 "and not as a general purpose register."); 2482 2483 PRODUCT_FLAG(bool, CheckIntrinsics, true, JVMFlag::DIAGNOSTIC, 2484 "When a class C is loaded, check that " 2485 "(1) all intrinsics defined by the VM for class C are present " 2486 "in the loaded class file and are marked with the " 2487 "@HotSpotIntrinsicCandidate annotation, that " 2488 "(2) there is an intrinsic registered for all loaded methods " 2489 "that are annotated with the @HotSpotIntrinsicCandidate " 2490 "annotation, and that " 2491 "(3) no orphan methods exist for class C (i.e., methods for " 2492 "which the VM declares an intrinsic but that are not declared " 2493 "in the loaded class C. " 2494 "Check (3) is available only in debug builds."); 2495 2496 PRODUCT_FLAG_PD(intx, InitArrayShortSize, JVMFlag::DIAGNOSTIC | JVMFlag::RANGE | JVMFlag::CONSTRAINT, 2497 "Threshold small size (in bytes) for clearing arrays. " 2498 "Anything this size or smaller may get converted to discrete " 2499 "scalar stores."); 2500 FLAG_RANGE( InitArrayShortSize, 0, max_intx); 2501 FLAG_CONSTRAINT( InitArrayShortSize, (void*)InitArrayShortSizeConstraintFunc, JVMFlag::AfterErgo); 2502 2503 PRODUCT_FLAG(bool, CompilerDirectivesIgnoreCompileCommands, false, JVMFlag::DIAGNOSTIC, 2504 "Disable backwards compatibility for compile commands."); 2505 2506 PRODUCT_FLAG(bool, CompilerDirectivesPrint, false, JVMFlag::DIAGNOSTIC, 2507 "Print compiler directives on installation."); 2508 2509 PRODUCT_FLAG(int, CompilerDirectivesLimit, 50, JVMFlag::DIAGNOSTIC, 2510 "Limit on number of compiler directives."); 2511 2512 PRODUCT_FLAG(ccstr, AllocateHeapAt, NULL, JVMFlag::DEFAULT, 2513 "Path to the directoy where a temporary file will be created " 2514 "to use as the backing store for Java Heap."); 2515 2516 PRODUCT_FLAG(ccstr, AllocateOldGenAt, NULL, JVMFlag::EXPERIMENTAL, 2517 "Path to the directoy where a temporary file will be " 2518 "created to use as the backing store for old generation." 2519 "File of size Xmx is pre-allocated for performance reason, so" 2520 "we need that much space available"); 2521 2522 DEVELOP_FLAG(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), JVMFlag::DEFAULT, 2523 "Run periodic metaspace verifications (0 - none, " 2524 "1 - always, >1 every nth interval)"); 2525 2526 PRODUCT_FLAG(bool, ShowRegistersOnAssert, true, JVMFlag::DIAGNOSTIC, 2527 "On internal errors, include registers in error report."); 2528 2529 PRODUCT_FLAG(bool, UseSwitchProfiling, true, JVMFlag::DIAGNOSTIC, 2530 "leverage profiling for table/lookup switch"); 2531 2532 DEVELOP_FLAG(bool, TraceMemoryWriteback, false, JVMFlag::DEFAULT, 2533 "Trace memory writeback operations"); 2534 2535 JFR_ONLY(PRODUCT_FLAG(bool, FlightRecorder, false, JVMFlag::DEFAULT, 2536 "(Deprecated) Enable Flight Recorder");) 2537 2538 JFR_ONLY(PRODUCT_FLAG(ccstr, FlightRecorderOptions, NULL, JVMFlag::DEFAULT, 2539 "Flight Recorder options");) 2540 2541 JFR_ONLY(PRODUCT_FLAG(ccstr, StartFlightRecording, NULL, JVMFlag::DEFAULT, 2542 "Start flight recording with options");) 2543 2544 PRODUCT_FLAG(bool, UseFastUnorderedTimeStamps, false, JVMFlag::EXPERIMENTAL, 2545 "Use platform unstable time where supported for timestamps only"); 2546 2547 PRODUCT_FLAG(bool, UseNewFieldLayout, true, JVMFlag::DEFAULT, 2548 "(Deprecated) Use new algorithm to compute field layouts"); 2549 2550 PRODUCT_FLAG(bool, UseEmptySlotsInSupers, true, JVMFlag::DEFAULT, 2551 "Allow allocating fields in empty slots of super-classes"); 2552 2553 2554 #ifdef _LP64 2555 PRODUCT_FLAG(bool, UseCompressedOops, false, JVMFlag::LP64, 2556 "Use 32-bit object references in 64-bit VM. " 2557 "lp64_product means flag is always constant in 32 bit VM"); 2558 2559 PRODUCT_FLAG(bool, UseCompressedClassPointers, false, JVMFlag::LP64, 2560 "Use 32-bit class pointers in 64-bit VM. " 2561 "lp64_product means flag is always constant in 32 bit VM"); 2562 2563 PRODUCT_FLAG(intx, ObjectAlignmentInBytes, 8, JVMFlag::LP64 | JVMFlag::RANGE | JVMFlag::CONSTRAINT, 2564 "Default object alignment in bytes, 8 is minimum"); 2565 FLAG_RANGE( ObjectAlignmentInBytes, 8, 256); 2566 FLAG_CONSTRAINT( ObjectAlignmentInBytes, (void*)ObjectAlignmentInBytesConstraintFunc, JVMFlag::AtParse); 2567 2568 #elif defined(IS_DECLARING_FLAG) 2569 const bool UseCompressedOops = false; // !JVMFlag::LP64 2570 const bool UseCompressedClassPointers = false; // !JVMFlag::LP64 2571 const intx ObjectAlignmentInBytes = 8; // !JVMFlag::LP64 2572 #endif // _LP64 2573 2574 #endif // SHARE_RUNTIME_GLOBALS_HPP |