1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_RUNTIME_GLOBALS_HPP 26 #define SHARE_RUNTIME_GLOBALS_HPP 27 28 #include "gc/shared/gc_globals.hpp" 29 #include "utilities/align.hpp" 30 #include "utilities/globalDefinitions.hpp" 31 #include "utilities/macros.hpp" 32 33 #include <float.h> // for DBL_MAX 34 35 // The larger HeapWordSize for 64bit requires larger heaps 36 // for the same application running in 64bit. See bug 4967770. 37 // The minimum alignment to a heap word size is done. Other 38 // parts of the memory system may require additional alignment 39 // and are responsible for those alignments. 40 #ifdef _LP64 41 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize) 42 #else 43 #define ScaleForWordSize(x) (x) 44 #endif 45 46 // use this for flags that are true per default in the tiered build 47 // but false in non-tiered builds, and vice versa 48 #ifdef TIERED 49 #define trueInTiered true 50 #define falseInTiered false 51 #else 52 #define trueInTiered false 53 #define falseInTiered true 54 #endif 55 56 // Default and minimum StringTable and SymbolTable size values 57 // Must be powers of 2 58 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 59 const size_t minimumStringTableSize = 128; 60 const size_t defaultSymbolTableSize = 32768; // 2^15 61 const size_t minimumSymbolTableSize = 1024; 62 63 #include CPU_HEADER(globals) 64 #include OS_HEADER(globals) 65 #include OS_CPU_HEADER(globals) 66 #ifdef COMPILER1 67 #include CPU_HEADER(c1_globals) 68 #include OS_HEADER(c1_globals) 69 #endif 70 #ifdef COMPILER2 71 #include CPU_HEADER(c2_globals) 72 #include OS_HEADER(c2_globals) 73 #endif 74 75 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI 76 define_pd_global(bool, BackgroundCompilation, false); 77 define_pd_global(bool, UseTLAB, false); 78 define_pd_global(bool, CICompileOSR, false); 79 define_pd_global(bool, UseTypeProfile, false); 80 define_pd_global(bool, UseOnStackReplacement, false); 81 define_pd_global(bool, InlineIntrinsics, false); 82 define_pd_global(bool, PreferInterpreterNativeStubs, true); 83 define_pd_global(bool, ProfileInterpreter, false); 84 define_pd_global(bool, ProfileTraps, false); 85 define_pd_global(bool, TieredCompilation, false); 86 87 define_pd_global(intx, CompileThreshold, 0); 88 89 define_pd_global(intx, OnStackReplacePercentage, 0); 90 define_pd_global(bool, ResizeTLAB, false); 91 define_pd_global(intx, FreqInlineSize, 0); 92 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 93 define_pd_global(bool, InlineClassNatives, true); 94 define_pd_global(bool, InlineUnsafeOps, true); 95 define_pd_global(uintx, InitialCodeCacheSize, 160*K); 96 define_pd_global(uintx, ReservedCodeCacheSize, 32*M); 97 define_pd_global(uintx, NonProfiledCodeHeapSize, 0); 98 define_pd_global(uintx, ProfiledCodeHeapSize, 0); 99 define_pd_global(uintx, NonNMethodCodeHeapSize, 32*M); 100 101 define_pd_global(uintx, CodeCacheExpansionSize, 32*K); 102 define_pd_global(uintx, CodeCacheMinBlockLength, 1); 103 define_pd_global(uintx, CodeCacheMinimumUseSpace, 200*K); 104 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 105 define_pd_global(bool, NeverActAsServerClassMachine, true); 106 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 107 #define CI_COMPILER_COUNT 0 108 #else 109 110 #if COMPILER2_OR_JVMCI 111 #define CI_COMPILER_COUNT 2 112 #else 113 #define CI_COMPILER_COUNT 1 114 #endif // COMPILER2_OR_JVMCI 115 116 #endif // no compilers 117 118 // use this for flags that are true by default in the debug version but 119 // false in the optimized version, and vice versa 120 #ifdef ASSERT 121 #define trueInDebug true 122 #define falseInDebug false 123 #else 124 #define trueInDebug false 125 #define falseInDebug true 126 #endif 127 128 // use this for flags that are true per default in the product build 129 // but false in development builds, and vice versa 130 #ifdef PRODUCT 131 #define trueInProduct true 132 #define falseInProduct false 133 #else 134 #define trueInProduct false 135 #define falseInProduct true 136 #endif 137 138 // develop flags are settable / visible only during development and are constant in the PRODUCT version 139 // product flags are always settable / visible 140 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 141 142 // A flag must be declared with one of the following types: 143 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t. 144 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used 145 // only in this file, because the macrology requires single-token type names. 146 147 // Note: Diagnostic options not meant for VM tuning or for product modes. 148 // They are to be used for VM quality assurance or field diagnosis 149 // of VM bugs. They are hidden so that users will not be encouraged to 150 // try them as if they were VM ordinary execution options. However, they 151 // are available in the product version of the VM. Under instruction 152 // from support engineers, VM customers can turn them on to collect 153 // diagnostic information about VM problems. To use a VM diagnostic 154 // option, you must first specify +UnlockDiagnosticVMOptions. 155 // (This master switch also affects the behavior of -Xprintflags.) 156 // 157 // experimental flags are in support of features that are not 158 // part of the officially supported product, but are available 159 // for experimenting with. They could, for example, be performance 160 // features that may not have undergone full or rigorous QA, but which may 161 // help performance in some cases and released for experimentation 162 // by the community of users and developers. This flag also allows one to 163 // be able to build a fully supported product that nonetheless also 164 // ships with some unsupported, lightly tested, experimental features. 165 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 166 // UnlockExperimentalVMOptions flag, which allows the control and 167 // modification of the experimental flags. 168 // 169 // Nota bene: neither diagnostic nor experimental options should be used casually, 170 // and they are not supported on production loads, except under explicit 171 // direction from support engineers. 172 // 173 // manageable flags are writeable external product flags. 174 // They are dynamically writeable through the JDK management interface 175 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 176 // These flags are external exported interface (see CCC). The list of 177 // manageable flags can be queried programmatically through the management 178 // interface. 179 // 180 // A flag can be made as "manageable" only if 181 // - the flag is defined in a CCC as an external exported interface. 182 // - the VM implementation supports dynamic setting of the flag. 183 // This implies that the VM must *always* query the flag variable 184 // and not reuse state related to the flag state at any given time. 185 // - you want the flag to be queried programmatically by the customers. 186 // 187 // product_rw flags are writeable internal product flags. 188 // They are like "manageable" flags but for internal/private use. 189 // The list of product_rw flags are internal/private flags which 190 // may be changed/removed in a future release. It can be set 191 // through the management interface to get/set value 192 // when the name of flag is supplied. 193 // 194 // A flag can be made as "product_rw" only if 195 // - the VM implementation supports dynamic setting of the flag. 196 // This implies that the VM must *always* query the flag variable 197 // and not reuse state related to the flag state at any given time. 198 // 199 // Note that when there is a need to support develop flags to be writeable, 200 // it can be done in the same way as product_rw. 201 // 202 // range is a macro that will expand to min and max arguments for range 203 // checking code if provided - see jvmFlagRangeList.hpp 204 // 205 // constraint is a macro that will expand to custom function call 206 // for constraint checking if provided - see jvmFlagConstraintList.hpp 207 // 208 // writeable is a macro that controls if and how the value can change during the runtime 209 // 210 // writeable(Always) is optional and allows the flag to have its value changed 211 // without any limitations at any time 212 // 213 // writeable(Once) flag value's can be only set once during the lifetime of VM 214 // 215 // writeable(CommandLineOnly) flag value's can be only set from command line 216 // (multiple times allowed) 217 // 218 219 220 #define RUNTIME_FLAGS(develop, \ 221 develop_pd, \ 222 product, \ 223 product_pd, \ 224 diagnostic, \ 225 diagnostic_pd, \ 226 experimental, \ 227 notproduct, \ 228 manageable, \ 229 product_rw, \ 230 lp64_product, \ 231 range, \ 232 constraint, \ 233 writeable) \ 234 \ 235 lp64_product(bool, UseCompressedOops, false, \ 236 "Use 32-bit object references in 64-bit VM. " \ 237 "lp64_product means flag is always constant in 32 bit VM") \ 238 \ 239 lp64_product(bool, UseCompressedClassPointers, false, \ 240 "Use 32-bit class pointers in 64-bit VM. " \ 241 "lp64_product means flag is always constant in 32 bit VM") \ 242 \ 243 notproduct(bool, CheckCompressedOops, true, \ 244 "Generate checks in encoding/decoding code in debug VM") \ 245 \ 246 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 247 "Heap allocation steps through preferred address regions to find" \ 248 " where it can allocate the heap. Number of steps to take per " \ 249 "region.") \ 250 range(1, max_uintx) \ 251 \ 252 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 253 "Default object alignment in bytes, 8 is minimum") \ 254 range(8, 256) \ 255 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 256 \ 257 develop(bool, CleanChunkPoolAsync, true, \ 258 "Clean the chunk pool asynchronously") \ 259 \ 260 product_pd(bool, ThreadLocalHandshakes, \ 261 "Use thread-local polls instead of global poll for safepoints.") \ 262 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 263 \ 264 diagnostic(uint, HandshakeTimeout, 0, \ 265 "If nonzero set a timeout in milliseconds for handshakes") \ 266 \ 267 experimental(bool, AlwaysSafeConstructors, false, \ 268 "Force safe construction, as if all fields are final.") \ 269 \ 270 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 271 "Enable normal processing of flags relating to field diagnostics")\ 272 \ 273 experimental(bool, UnlockExperimentalVMOptions, false, \ 274 "Enable normal processing of flags relating to experimental " \ 275 "features") \ 276 \ 277 product(bool, JavaMonitorsInStackTrace, true, \ 278 "Print information about Java monitor locks when the stacks are" \ 279 "dumped") \ 280 \ 281 product_pd(bool, UseLargePages, \ 282 "Use large page memory") \ 283 \ 284 product_pd(bool, UseLargePagesIndividualAllocation, \ 285 "Allocate large pages individually for better affinity") \ 286 \ 287 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 288 "Fail large pages individual allocation") \ 289 \ 290 product(bool, UseLargePagesInMetaspace, false, \ 291 "Use large page memory in metaspace. " \ 292 "Only used if UseLargePages is enabled.") \ 293 \ 294 product(bool, UseNUMA, false, \ 295 "Use NUMA if available") \ 296 \ 297 product(bool, UseNUMAInterleaving, false, \ 298 "Interleave memory across NUMA nodes if available") \ 299 \ 300 product(size_t, NUMAInterleaveGranularity, 2*M, \ 301 "Granularity to use for NUMA interleaving on Windows OS") \ 302 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 303 \ 304 product(bool, ForceNUMA, false, \ 305 "Force NUMA optimizations on single-node/UMA systems") \ 306 \ 307 product(uintx, NUMAChunkResizeWeight, 20, \ 308 "Percentage (0-100) used to weight the current sample when " \ 309 "computing exponentially decaying average for " \ 310 "AdaptiveNUMAChunkSizing") \ 311 range(0, 100) \ 312 \ 313 product(size_t, NUMASpaceResizeRate, 1*G, \ 314 "Do not reallocate more than this amount per collection") \ 315 range(0, max_uintx) \ 316 \ 317 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 318 "Enable adaptive chunk sizing for NUMA") \ 319 \ 320 product(bool, NUMAStats, false, \ 321 "Print NUMA stats in detailed heap information") \ 322 \ 323 product(uintx, NUMAPageScanRate, 256, \ 324 "Maximum number of pages to include in the page scan procedure") \ 325 range(0, max_uintx) \ 326 \ 327 product_pd(bool, NeedsDeoptSuspend, \ 328 "True for register window machines (sparc/ia64)") \ 329 \ 330 product(intx, UseSSE, 99, \ 331 "Highest supported SSE instructions set on x86/x64") \ 332 range(0, 99) \ 333 \ 334 product(bool, UseAES, false, \ 335 "Control whether AES instructions are used when available") \ 336 \ 337 product(bool, UseFMA, false, \ 338 "Control whether FMA instructions are used when available") \ 339 \ 340 product(bool, UseSHA, false, \ 341 "Control whether SHA instructions are used when available") \ 342 \ 343 diagnostic(bool, UseGHASHIntrinsics, false, \ 344 "Use intrinsics for GHASH versions of crypto") \ 345 \ 346 product(bool, UseBASE64Intrinsics, false, \ 347 "Use intrinsics for java.util.Base64") \ 348 \ 349 product(size_t, LargePageSizeInBytes, 0, \ 350 "Large page size (0 to let VM choose the page size)") \ 351 range(0, max_uintx) \ 352 \ 353 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 354 "Use large pages if maximum heap is at least this big") \ 355 range(0, max_uintx) \ 356 \ 357 product(bool, ForceTimeHighResolution, false, \ 358 "Using high time resolution (for Win32 only)") \ 359 \ 360 develop(bool, TracePcPatching, false, \ 361 "Trace usage of frame::patch_pc") \ 362 \ 363 develop(bool, TraceRelocator, false, \ 364 "Trace the bytecode relocator") \ 365 \ 366 develop(bool, TraceLongCompiles, false, \ 367 "Print out every time compilation is longer than " \ 368 "a given threshold") \ 369 \ 370 develop(bool, SafepointALot, false, \ 371 "Generate a lot of safepoints. This works with " \ 372 "GuaranteedSafepointInterval") \ 373 \ 374 product_pd(bool, BackgroundCompilation, \ 375 "A thread requesting compilation is not blocked during " \ 376 "compilation") \ 377 \ 378 product(bool, PrintVMQWaitTime, false, \ 379 "Print out the waiting time in VM operation queue") \ 380 \ 381 product(bool, MethodFlushing, true, \ 382 "Reclamation of zombie and not-entrant methods") \ 383 \ 384 develop(bool, VerifyStack, false, \ 385 "Verify stack of each thread when it is entering a runtime call") \ 386 \ 387 diagnostic(bool, ForceUnreachable, false, \ 388 "Make all non code cache addresses to be unreachable by " \ 389 "forcing use of 64bit literal fixups") \ 390 \ 391 notproduct(bool, StressDerivedPointers, false, \ 392 "Force scavenge when a derived pointer is detected on stack " \ 393 "after rtm call") \ 394 \ 395 develop(bool, TraceDerivedPointers, false, \ 396 "Trace traversal of derived pointers on stack") \ 397 \ 398 notproduct(bool, TraceCodeBlobStacks, false, \ 399 "Trace stack-walk of codeblobs") \ 400 \ 401 product(bool, PrintJNIResolving, false, \ 402 "Used to implement -v:jni") \ 403 \ 404 notproduct(bool, PrintRewrites, false, \ 405 "Print methods that are being rewritten") \ 406 \ 407 product(bool, UseInlineCaches, true, \ 408 "Use Inline Caches for virtual calls ") \ 409 \ 410 diagnostic(bool, InlineArrayCopy, true, \ 411 "Inline arraycopy native that is known to be part of " \ 412 "base library DLL") \ 413 \ 414 diagnostic(bool, InlineObjectHash, true, \ 415 "Inline Object::hashCode() native that is known to be part " \ 416 "of base library DLL") \ 417 \ 418 diagnostic(bool, InlineNatives, true, \ 419 "Inline natives that are known to be part of base library DLL") \ 420 \ 421 diagnostic(bool, InlineMathNatives, true, \ 422 "Inline SinD, CosD, etc.") \ 423 \ 424 diagnostic(bool, InlineClassNatives, true, \ 425 "Inline Class.isInstance, etc") \ 426 \ 427 diagnostic(bool, InlineThreadNatives, true, \ 428 "Inline Thread.currentThread, etc") \ 429 \ 430 diagnostic(bool, InlineUnsafeOps, true, \ 431 "Inline memory ops (native methods) from Unsafe") \ 432 \ 433 product(bool, CriticalJNINatives, true, \ 434 "Check for critical JNI entry points") \ 435 \ 436 notproduct(bool, StressCriticalJNINatives, false, \ 437 "Exercise register saving code in critical natives") \ 438 \ 439 diagnostic(bool, UseAESIntrinsics, false, \ 440 "Use intrinsics for AES versions of crypto") \ 441 \ 442 diagnostic(bool, UseAESCTRIntrinsics, false, \ 443 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 444 \ 445 diagnostic(bool, UseSHA1Intrinsics, false, \ 446 "Use intrinsics for SHA-1 crypto hash function. " \ 447 "Requires that UseSHA is enabled.") \ 448 \ 449 diagnostic(bool, UseSHA256Intrinsics, false, \ 450 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 451 "Requires that UseSHA is enabled.") \ 452 \ 453 diagnostic(bool, UseSHA512Intrinsics, false, \ 454 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 455 "Requires that UseSHA is enabled.") \ 456 \ 457 diagnostic(bool, UseCRC32Intrinsics, false, \ 458 "use intrinsics for java.util.zip.CRC32") \ 459 \ 460 diagnostic(bool, UseCRC32CIntrinsics, false, \ 461 "use intrinsics for java.util.zip.CRC32C") \ 462 \ 463 diagnostic(bool, UseAdler32Intrinsics, false, \ 464 "use intrinsics for java.util.zip.Adler32") \ 465 \ 466 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 467 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 468 \ 469 diagnostic(ccstrlist, DisableIntrinsic, "", \ 470 "do not expand intrinsics whose (internal) names appear here") \ 471 \ 472 develop(bool, TraceCallFixup, false, \ 473 "Trace all call fixups") \ 474 \ 475 develop(bool, DeoptimizeALot, false, \ 476 "Deoptimize at every exit from the runtime system") \ 477 \ 478 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 479 "A comma separated list of bcis to deoptimize at") \ 480 \ 481 product(bool, DeoptimizeRandom, false, \ 482 "Deoptimize random frames on random exit from the runtime system")\ 483 \ 484 notproduct(bool, ZombieALot, false, \ 485 "Create zombies (non-entrant) at exit from the runtime system") \ 486 \ 487 notproduct(bool, WalkStackALot, false, \ 488 "Trace stack (no print) at every exit from the runtime system") \ 489 \ 490 product(bool, Debugging, false, \ 491 "Set when executing debug methods in debug.cpp " \ 492 "(to prevent triggering assertions)") \ 493 \ 494 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 495 "Enable strict checks that safepoints cannot happen for threads " \ 496 "that use NoSafepointVerifier") \ 497 \ 498 notproduct(bool, VerifyLastFrame, false, \ 499 "Verify oops on last frame on entry to VM") \ 500 \ 501 product(bool, FailOverToOldVerifier, true, \ 502 "Fail over to old verifier when split verifier fails") \ 503 \ 504 product(bool, SafepointTimeout, false, \ 505 "Time out and warn or fail after SafepointTimeoutDelay " \ 506 "milliseconds if failed to reach safepoint") \ 507 \ 508 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 509 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 510 \ 511 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 512 "Abort upon failure to complete VM operation promptly") \ 513 \ 514 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 515 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 516 range(0, max_intx) \ 517 \ 518 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 519 /* typically, at most a few retries are needed */ \ 520 product(intx, SuspendRetryCount, 50, \ 521 "Maximum retry count for an external suspend request") \ 522 range(0, max_intx) \ 523 \ 524 product(intx, SuspendRetryDelay, 5, \ 525 "Milliseconds to delay per retry (* current_retry_count)") \ 526 range(0, max_intx) \ 527 \ 528 product(bool, AssertOnSuspendWaitFailure, false, \ 529 "Assert/Guarantee on external suspend wait failure") \ 530 \ 531 product(bool, TraceSuspendWaitFailures, false, \ 532 "Trace external suspend wait failures") \ 533 \ 534 product(bool, MaxFDLimit, true, \ 535 "Bump the number of file descriptors to maximum in Solaris") \ 536 \ 537 diagnostic(bool, LogEvents, true, \ 538 "Enable the various ring buffer event logs") \ 539 \ 540 diagnostic(uintx, LogEventsBufferEntries, 10, \ 541 "Number of ring buffer event logs") \ 542 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 543 \ 544 product(bool, BytecodeVerificationRemote, true, \ 545 "Enable the Java bytecode verifier for remote classes") \ 546 \ 547 product(bool, BytecodeVerificationLocal, false, \ 548 "Enable the Java bytecode verifier for local classes") \ 549 \ 550 develop(bool, ForceFloatExceptions, trueInDebug, \ 551 "Force exceptions on FP stack under/overflow") \ 552 \ 553 develop(bool, VerifyStackAtCalls, false, \ 554 "Verify that the stack pointer is unchanged after calls") \ 555 \ 556 develop(bool, TraceJavaAssertions, false, \ 557 "Trace java language assertions") \ 558 \ 559 notproduct(bool, VerifyCodeCache, false, \ 560 "Verify code cache on memory allocation/deallocation") \ 561 \ 562 develop(bool, UseMallocOnly, false, \ 563 "Use only malloc/free for allocation (no resource area/arena)") \ 564 \ 565 develop(bool, PrintMallocStatistics, false, \ 566 "Print malloc/free statistics") \ 567 \ 568 develop(bool, ZapResourceArea, trueInDebug, \ 569 "Zap freed resource/arena space with 0xABABABAB") \ 570 \ 571 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 572 "Zap freed VM handle space with 0xBCBCBCBC") \ 573 \ 574 notproduct(bool, ZapStackSegments, trueInDebug, \ 575 "Zap allocated/freed stack segments with 0xFADFADED") \ 576 \ 577 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 578 "Zap unused heap space with 0xBAADBABE") \ 579 \ 580 develop(bool, CheckZapUnusedHeapArea, false, \ 581 "Check zapping of unused heap space") \ 582 \ 583 develop(bool, ZapFillerObjects, trueInDebug, \ 584 "Zap filler objects with 0xDEAFBABE") \ 585 \ 586 develop(bool, PrintVMMessages, true, \ 587 "Print VM messages on console") \ 588 \ 589 notproduct(uintx, ErrorHandlerTest, 0, \ 590 "If > 0, provokes an error after VM initialization; the value " \ 591 "determines which error to provoke. See test_error_handler() " \ 592 "in vmError.cpp.") \ 593 \ 594 notproduct(uintx, TestCrashInErrorHandler, 0, \ 595 "If > 0, provokes an error inside VM error handler (a secondary " \ 596 "crash). see test_error_handler() in vmError.cpp") \ 597 \ 598 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 599 "If true, tests SafeFetch inside error handler.") \ 600 \ 601 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 602 "If true, simulates an unresponsive error handler.") \ 603 \ 604 develop(bool, Verbose, false, \ 605 "Print additional debugging information from other modes") \ 606 \ 607 develop(bool, PrintMiscellaneous, false, \ 608 "Print uncategorized debugging information (requires +Verbose)") \ 609 \ 610 develop(bool, WizardMode, false, \ 611 "Print much more debugging information") \ 612 \ 613 product(bool, ShowMessageBoxOnError, false, \ 614 "Keep process alive on VM fatal error") \ 615 \ 616 product(bool, CreateCoredumpOnCrash, true, \ 617 "Create core/mini dump on VM fatal error") \ 618 \ 619 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 620 "Timeout, in seconds, to limit the time spent on writing an " \ 621 "error log in case of a crash.") \ 622 range(0, (uint64_t)max_jlong/1000) \ 623 \ 624 product_pd(bool, UseOSErrorReporting, \ 625 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 626 \ 627 product(bool, SuppressFatalErrorMessage, false, \ 628 "Report NO fatal error message (avoid deadlock)") \ 629 \ 630 product(ccstrlist, OnError, "", \ 631 "Run user-defined commands on fatal error; see VMError.cpp " \ 632 "for examples") \ 633 \ 634 product(ccstrlist, OnOutOfMemoryError, "", \ 635 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 636 \ 637 manageable(bool, HeapDumpBeforeFullGC, false, \ 638 "Dump heap to file before any major stop-the-world GC") \ 639 \ 640 manageable(bool, HeapDumpAfterFullGC, false, \ 641 "Dump heap to file after any major stop-the-world GC") \ 642 \ 643 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 644 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 645 \ 646 manageable(ccstr, HeapDumpPath, NULL, \ 647 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 648 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 649 "in the working directory)") \ 650 \ 651 develop(bool, BreakAtWarning, false, \ 652 "Execute breakpoint upon encountering VM warning") \ 653 \ 654 develop(bool, UseFakeTimers, false, \ 655 "Tell whether the VM should use system time or a fake timer") \ 656 \ 657 product(ccstr, NativeMemoryTracking, "off", \ 658 "Native memory tracking options") \ 659 \ 660 diagnostic(bool, PrintNMTStatistics, false, \ 661 "Print native memory tracking summary data if it is on") \ 662 \ 663 diagnostic(bool, LogCompilation, false, \ 664 "Log compilation activity in detail to LogFile") \ 665 \ 666 product(bool, PrintCompilation, false, \ 667 "Print compilations") \ 668 \ 669 product(bool, PrintExtendedThreadInfo, false, \ 670 "Print more information in thread dump") \ 671 \ 672 diagnostic(bool, TraceNMethodInstalls, false, \ 673 "Trace nmethod installation") \ 674 \ 675 diagnostic(intx, ScavengeRootsInCode, 2, \ 676 "0: do not allow scavengable oops in the code cache; " \ 677 "1: allow scavenging from the code cache; " \ 678 "2: emit as many constants as the compiler can see") \ 679 range(0, 2) \ 680 \ 681 product(bool, AlwaysRestoreFPU, false, \ 682 "Restore the FPU control word after every JNI call (expensive)") \ 683 \ 684 diagnostic(bool, PrintCompilation2, false, \ 685 "Print additional statistics per compilation") \ 686 \ 687 diagnostic(bool, PrintAdapterHandlers, false, \ 688 "Print code generated for i2c/c2i adapters") \ 689 \ 690 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 691 "Verify that i2c/c2i adapters are called properly") \ 692 \ 693 develop(bool, VerifyAdapterSharing, false, \ 694 "Verify that the code for shared adapters is the equivalent") \ 695 \ 696 diagnostic(bool, PrintAssembly, false, \ 697 "Print assembly code (using external disassembler.so)") \ 698 \ 699 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 700 "Print options string passed to disassembler.so") \ 701 \ 702 notproduct(bool, PrintNMethodStatistics, false, \ 703 "Print a summary statistic for the generated nmethods") \ 704 \ 705 diagnostic(bool, PrintNMethods, false, \ 706 "Print assembly code for nmethods when generated") \ 707 \ 708 diagnostic(bool, PrintNativeNMethods, false, \ 709 "Print assembly code for native nmethods when generated") \ 710 \ 711 develop(bool, PrintDebugInfo, false, \ 712 "Print debug information for all nmethods when generated") \ 713 \ 714 develop(bool, PrintRelocations, false, \ 715 "Print relocation information for all nmethods when generated") \ 716 \ 717 develop(bool, PrintDependencies, false, \ 718 "Print dependency information for all nmethods when generated") \ 719 \ 720 develop(bool, PrintExceptionHandlers, false, \ 721 "Print exception handler tables for all nmethods when generated") \ 722 \ 723 develop(bool, StressCompiledExceptionHandlers, false, \ 724 "Exercise compiled exception handlers") \ 725 \ 726 develop(bool, InterceptOSException, false, \ 727 "Start debugger when an implicit OS (e.g. NULL) " \ 728 "exception happens") \ 729 \ 730 product(bool, PrintCodeCache, false, \ 731 "Print the code cache memory usage when exiting") \ 732 \ 733 develop(bool, PrintCodeCache2, false, \ 734 "Print detailed usage information on the code cache when exiting")\ 735 \ 736 product(bool, PrintCodeCacheOnCompilation, false, \ 737 "Print the code cache memory usage each time a method is " \ 738 "compiled") \ 739 \ 740 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 741 "Print code heap usage statistics on exit and on full condition") \ 742 \ 743 diagnostic(bool, PrintStubCode, false, \ 744 "Print generated stub code") \ 745 \ 746 product(bool, StackTraceInThrowable, true, \ 747 "Collect backtrace in throwable when exception happens") \ 748 \ 749 product(bool, OmitStackTraceInFastThrow, true, \ 750 "Omit backtraces for some 'hot' exceptions in optimized code") \ 751 \ 752 product(bool, PrintWarnings, true, \ 753 "Print JVM warnings to output stream") \ 754 \ 755 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 756 "Print warnings for stalled SpinLocks") \ 757 \ 758 product(bool, RegisterFinalizersAtInit, true, \ 759 "Register finalizable objects at end of Object.<init> or " \ 760 "after allocation") \ 761 \ 762 develop(bool, RegisterReferences, true, \ 763 "Tell whether the VM should register soft/weak/final/phantom " \ 764 "references") \ 765 \ 766 develop(bool, IgnoreRewrites, false, \ 767 "Suppress rewrites of bytecodes in the oopmap generator. " \ 768 "This is unsafe!") \ 769 \ 770 develop(bool, PrintCodeCacheExtension, false, \ 771 "Print extension of code cache") \ 772 \ 773 develop(bool, UsePrivilegedStack, true, \ 774 "Enable the security JVM functions") \ 775 \ 776 develop(bool, ProtectionDomainVerification, true, \ 777 "Verify protection domain before resolution in system dictionary")\ 778 \ 779 product(bool, ClassUnloading, true, \ 780 "Do unloading of classes") \ 781 \ 782 product(bool, ClassUnloadingWithConcurrentMark, true, \ 783 "Do unloading of classes with a concurrent marking cycle") \ 784 \ 785 develop(bool, DisableStartThread, false, \ 786 "Disable starting of additional Java threads " \ 787 "(for debugging only)") \ 788 \ 789 develop(bool, MemProfiling, false, \ 790 "Write memory usage profiling to log file") \ 791 \ 792 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 793 "Print the system dictionary at exit") \ 794 \ 795 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 796 "Dynamically resize system dictionaries as needed") \ 797 \ 798 product(bool, AlwaysLockClassLoader, false, \ 799 "Require the VM to acquire the class loader lock before calling " \ 800 "loadClass() even for class loaders registering " \ 801 "as parallel capable") \ 802 \ 803 product(bool, AllowParallelDefineClass, false, \ 804 "Allow parallel defineClass requests for class loaders " \ 805 "registering as parallel capable") \ 806 \ 807 product_pd(bool, DontYieldALot, \ 808 "Throw away obvious excess yield calls") \ 809 \ 810 develop(bool, UseDetachedThreads, true, \ 811 "Use detached threads that are recycled upon termination " \ 812 "(for Solaris only)") \ 813 \ 814 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 815 "Disable the use of stack guard pages if the JVM is loaded " \ 816 "on the primordial process thread") \ 817 \ 818 product(bool, UseLWPSynchronization, true, \ 819 "Use LWP-based instead of libthread-based synchronization " \ 820 "(SPARC only)") \ 821 \ 822 product(intx, MonitorBound, 0, "Bound Monitor population") \ 823 range(0, max_jint) \ 824 \ 825 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 826 "Percentage of used monitors before triggering cleanup " \ 827 "safepoint which deflates monitors (0 is off). " \ 828 "The check is performed on GuaranteedSafepointInterval.") \ 829 range(0, 100) \ 830 \ 831 experimental(intx, hashCode, 5, \ 832 "(Unstable) select hashCode generation algorithm") \ 833 \ 834 product(bool, FilterSpuriousWakeups, true, \ 835 "When true prevents OS-level spurious, or premature, wakeups " \ 836 "from Object.wait (Ignored for Windows)") \ 837 \ 838 develop(bool, UsePthreads, false, \ 839 "Use pthread-based instead of libthread-based synchronization " \ 840 "(SPARC only)") \ 841 \ 842 product(bool, ReduceSignalUsage, false, \ 843 "Reduce the use of OS signals in Java and/or the VM") \ 844 \ 845 develop_pd(bool, ShareVtableStubs, \ 846 "Share vtable stubs (smaller code but worse branch prediction") \ 847 \ 848 develop(bool, LoadLineNumberTables, true, \ 849 "Tell whether the class file parser loads line number tables") \ 850 \ 851 develop(bool, LoadLocalVariableTables, true, \ 852 "Tell whether the class file parser loads local variable tables") \ 853 \ 854 develop(bool, LoadLocalVariableTypeTables, true, \ 855 "Tell whether the class file parser loads local variable type" \ 856 "tables") \ 857 \ 858 product(bool, AllowUserSignalHandlers, false, \ 859 "Do not complain if the application installs signal handlers " \ 860 "(Solaris & Linux only)") \ 861 \ 862 product(bool, UseSignalChaining, true, \ 863 "Use signal-chaining to invoke signal handlers installed " \ 864 "by the application (Solaris & Linux only)") \ 865 \ 866 product(bool, AllowJNIEnvProxy, false, \ 867 "Allow JNIEnv proxies for jdbx") \ 868 \ 869 product(bool, RestoreMXCSROnJNICalls, false, \ 870 "Restore MXCSR when returning from JNI calls") \ 871 \ 872 product(bool, CheckJNICalls, false, \ 873 "Verify all arguments to JNI calls") \ 874 \ 875 product(bool, UseFastJNIAccessors, true, \ 876 "Use optimized versions of Get<Primitive>Field") \ 877 \ 878 product(intx, MaxJNILocalCapacity, 65536, \ 879 "Maximum allowable local JNI handle capacity to " \ 880 "EnsureLocalCapacity() and PushLocalFrame(), " \ 881 "where <= 0 is unlimited, default: 65536") \ 882 range(min_intx, max_intx) \ 883 \ 884 product(bool, EagerXrunInit, false, \ 885 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 886 "but not all -Xrun libraries may support the state of the VM " \ 887 "at this time") \ 888 \ 889 product(bool, PreserveAllAnnotations, false, \ 890 "Preserve RuntimeInvisibleAnnotations as well " \ 891 "as RuntimeVisibleAnnotations") \ 892 \ 893 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 894 "Number of OutOfMemoryErrors preallocated with backtrace") \ 895 \ 896 product(bool, UseXMMForArrayCopy, false, \ 897 "Use SSE2 MOVQ instruction for Arraycopy") \ 898 \ 899 product(intx, FieldsAllocationStyle, 1, \ 900 "0 - type based with oops first, " \ 901 "1 - with oops last, " \ 902 "2 - oops in super and sub classes are together") \ 903 range(0, 2) \ 904 \ 905 product(bool, CompactFields, true, \ 906 "Allocate nonstatic fields in gaps between previous fields") \ 907 \ 908 notproduct(bool, PrintFieldLayout, false, \ 909 "Print field layout for each class") \ 910 \ 911 /* Need to limit the extent of the padding to reasonable size. */\ 912 /* 8K is well beyond the reasonable HW cache line size, even with */\ 913 /* aggressive prefetching, while still leaving the room for segregating */\ 914 /* among the distinct pages. */\ 915 product(intx, ContendedPaddingWidth, 128, \ 916 "How many bytes to pad the fields/classes marked @Contended with")\ 917 range(0, 8192) \ 918 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 919 \ 920 product(bool, EnableContended, true, \ 921 "Enable @Contended annotation support") \ 922 \ 923 product(bool, RestrictContended, true, \ 924 "Restrict @Contended to trusted classes") \ 925 \ 926 product(bool, UseBiasedLocking, true, \ 927 "Enable biased locking in JVM") \ 928 \ 929 product(intx, BiasedLockingStartupDelay, 0, \ 930 "Number of milliseconds to wait before enabling biased locking") \ 931 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 932 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 933 \ 934 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 935 "Print statistics of biased locking in JVM") \ 936 \ 937 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 938 "Threshold of number of revocations per type to try to " \ 939 "rebias all objects in the heap of that type") \ 940 range(0, max_intx) \ 941 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 942 \ 943 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 944 "Threshold of number of revocations per type to permanently " \ 945 "revoke biases of all objects in the heap of that type") \ 946 range(0, max_intx) \ 947 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 948 \ 949 product(intx, BiasedLockingDecayTime, 25000, \ 950 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 951 "type after previous bulk rebias") \ 952 range(500, max_intx) \ 953 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 954 \ 955 product(bool, ExitOnOutOfMemoryError, false, \ 956 "JVM exits on the first occurrence of an out-of-memory error") \ 957 \ 958 product(bool, CrashOnOutOfMemoryError, false, \ 959 "JVM aborts, producing an error log and core/mini dump, on the " \ 960 "first occurrence of an out-of-memory error") \ 961 \ 962 /* tracing */ \ 963 \ 964 develop(bool, StressRewriter, false, \ 965 "Stress linktime bytecode rewriting") \ 966 \ 967 product(ccstr, TraceJVMTI, NULL, \ 968 "Trace flags for JVMTI functions and events") \ 969 \ 970 /* This option can change an EMCP method into an obsolete method. */ \ 971 /* This can affect tests that except specific methods to be EMCP. */ \ 972 /* This option should be used with caution. */ \ 973 product(bool, StressLdcRewrite, false, \ 974 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 975 \ 976 /* change to false by default sometime after Mustang */ \ 977 product(bool, VerifyMergedCPBytecodes, true, \ 978 "Verify bytecodes after RedefineClasses constant pool merging") \ 979 \ 980 develop(bool, TraceBytecodes, false, \ 981 "Trace bytecode execution") \ 982 \ 983 develop(bool, TraceICs, false, \ 984 "Trace inline cache changes") \ 985 \ 986 notproduct(bool, TraceInvocationCounterOverflow, false, \ 987 "Trace method invocation counter overflow") \ 988 \ 989 develop(bool, TraceInlineCacheClearing, false, \ 990 "Trace clearing of inline caches in nmethods") \ 991 \ 992 develop(bool, TraceDependencies, false, \ 993 "Trace dependencies") \ 994 \ 995 develop(bool, VerifyDependencies, trueInDebug, \ 996 "Exercise and verify the compilation dependency mechanism") \ 997 \ 998 develop(bool, TraceNewOopMapGeneration, false, \ 999 "Trace OopMapGeneration") \ 1000 \ 1001 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1002 "Trace OopMapGeneration: print detailed cell states") \ 1003 \ 1004 develop(bool, TimeOopMap, false, \ 1005 "Time calls to GenerateOopMap::compute_map() in sum") \ 1006 \ 1007 develop(bool, TimeOopMap2, false, \ 1008 "Time calls to GenerateOopMap::compute_map() individually") \ 1009 \ 1010 develop(bool, TraceOopMapRewrites, false, \ 1011 "Trace rewriting of method oops during oop map generation") \ 1012 \ 1013 develop(bool, TraceICBuffer, false, \ 1014 "Trace usage of IC buffer") \ 1015 \ 1016 develop(bool, TraceCompiledIC, false, \ 1017 "Trace changes of compiled IC") \ 1018 \ 1019 develop(bool, FLSVerifyDictionary, false, \ 1020 "Do lots of (expensive) FLS dictionary verification") \ 1021 \ 1022 \ 1023 notproduct(bool, CheckMemoryInitialization, false, \ 1024 "Check memory initialization") \ 1025 \ 1026 product(uintx, ProcessDistributionStride, 4, \ 1027 "Stride through processors when distributing processes") \ 1028 range(0, max_juint) \ 1029 \ 1030 develop(bool, TraceFinalizerRegistration, false, \ 1031 "Trace registration of final references") \ 1032 \ 1033 product(bool, IgnoreEmptyClassPaths, false, \ 1034 "Ignore empty path elements in -classpath") \ 1035 \ 1036 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 1037 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 1038 "Initial size of the boot class loader data metaspace") \ 1039 range(30*K, max_uintx/BytesPerWord) \ 1040 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 1041 \ 1042 product(bool, PrintHeapAtSIGBREAK, true, \ 1043 "Print heap layout in response to SIGBREAK") \ 1044 \ 1045 manageable(bool, PrintClassHistogram, false, \ 1046 "Print a histogram of class instances") \ 1047 \ 1048 experimental(double, ObjectCountCutOffPercent, 0.5, \ 1049 "The percentage of the used heap that the instances of a class " \ 1050 "must occupy for the class to generate a trace event") \ 1051 range(0.0, 100.0) \ 1052 \ 1053 /* JVMTI heap profiling */ \ 1054 \ 1055 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 1056 "Trace JVMTI object tagging calls") \ 1057 \ 1058 diagnostic(bool, VerifyBeforeIteration, false, \ 1059 "Verify memory system before JVMTI iteration") \ 1060 \ 1061 /* compiler interface */ \ 1062 \ 1063 develop(bool, CIPrintCompilerName, false, \ 1064 "when CIPrint is active, print the name of the active compiler") \ 1065 \ 1066 diagnostic(bool, CIPrintCompileQueue, false, \ 1067 "display the contents of the compile queue whenever a " \ 1068 "compilation is enqueued") \ 1069 \ 1070 develop(bool, CIPrintRequests, false, \ 1071 "display every request for compilation") \ 1072 \ 1073 product(bool, CITime, false, \ 1074 "collect timing information for compilation") \ 1075 \ 1076 develop(bool, CITimeVerbose, false, \ 1077 "be more verbose in compilation timings") \ 1078 \ 1079 develop(bool, CITimeEach, false, \ 1080 "display timing information after each successful compilation") \ 1081 \ 1082 develop(bool, CICountOSR, false, \ 1083 "use a separate counter when assigning ids to osr compilations") \ 1084 \ 1085 develop(bool, CICompileNatives, true, \ 1086 "compile native methods if supported by the compiler") \ 1087 \ 1088 develop_pd(bool, CICompileOSR, \ 1089 "compile on stack replacement methods if supported by the " \ 1090 "compiler") \ 1091 \ 1092 develop(bool, CIPrintMethodCodes, false, \ 1093 "print method bytecodes of the compiled code") \ 1094 \ 1095 develop(bool, CIPrintTypeFlow, false, \ 1096 "print the results of ciTypeFlow analysis") \ 1097 \ 1098 develop(bool, CITraceTypeFlow, false, \ 1099 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 1100 \ 1101 develop(intx, OSROnlyBCI, -1, \ 1102 "OSR only at this bci. Negative values mean exclude that bci") \ 1103 \ 1104 /* compiler */ \ 1105 \ 1106 /* notice: the max range value here is max_jint, not max_intx */ \ 1107 /* because of overflow issue */ \ 1108 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 1109 "Number of compiler threads to run") \ 1110 range(0, max_jint) \ 1111 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 1112 \ 1113 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 1114 "Dynamically choose the number of parallel compiler threads") \ 1115 \ 1116 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 1117 "Reduce the number of parallel compiler threads when they " \ 1118 "are not used") \ 1119 \ 1120 diagnostic(bool, TraceCompilerThreads, false, \ 1121 "Trace creation and removal of compiler threads") \ 1122 \ 1123 develop(bool, InjectCompilerCreationFailure, false, \ 1124 "Inject thread creation failures for " \ 1125 "UseDynamicNumberOfCompilerThreads") \ 1126 \ 1127 product(intx, CompilationPolicyChoice, 0, \ 1128 "which compilation policy (0-2)") \ 1129 range(0, 2) \ 1130 \ 1131 develop(bool, UseStackBanging, true, \ 1132 "use stack banging for stack overflow checks (required for " \ 1133 "proper StackOverflow handling; disable only to measure cost " \ 1134 "of stackbanging)") \ 1135 \ 1136 develop(bool, UseStrictFP, true, \ 1137 "use strict fp if modifier strictfp is set") \ 1138 \ 1139 develop(bool, GenerateSynchronizationCode, true, \ 1140 "generate locking/unlocking code for synchronized methods and " \ 1141 "monitors") \ 1142 \ 1143 develop(bool, GenerateRangeChecks, true, \ 1144 "Generate range checks for array accesses") \ 1145 \ 1146 diagnostic_pd(bool, ImplicitNullChecks, \ 1147 "Generate code for implicit null checks") \ 1148 \ 1149 product_pd(bool, TrapBasedNullChecks, \ 1150 "Generate code for null checks that uses a cmp and trap " \ 1151 "instruction raising SIGTRAP. This is only used if an access to" \ 1152 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1153 "ImplicitNullChecks don't work (PPC64).") \ 1154 \ 1155 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1156 "Enable Thread SMR extra validity checks") \ 1157 \ 1158 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1159 "Enable Thread SMR Statistics") \ 1160 \ 1161 product(bool, Inline, true, \ 1162 "Enable inlining") \ 1163 \ 1164 product(bool, ClipInlining, true, \ 1165 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1166 \ 1167 develop(bool, UseCHA, true, \ 1168 "Enable CHA") \ 1169 \ 1170 product(bool, UseTypeProfile, true, \ 1171 "Check interpreter profile for historically monomorphic calls") \ 1172 \ 1173 diagnostic(bool, PrintInlining, false, \ 1174 "Print inlining optimizations") \ 1175 \ 1176 product(bool, UsePopCountInstruction, false, \ 1177 "Use population count instruction") \ 1178 \ 1179 develop(bool, EagerInitialization, false, \ 1180 "Eagerly initialize classes if possible") \ 1181 \ 1182 diagnostic(bool, LogTouchedMethods, false, \ 1183 "Log methods which have been ever touched in runtime") \ 1184 \ 1185 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1186 "Print all methods that have been ever touched in runtime") \ 1187 \ 1188 develop(bool, TraceMethodReplacement, false, \ 1189 "Print when methods are replaced do to recompilation") \ 1190 \ 1191 develop(bool, PrintMethodFlushing, false, \ 1192 "Print the nmethods being flushed") \ 1193 \ 1194 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1195 "print statistics about method flushing") \ 1196 \ 1197 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1198 "Number of compiled code invocations after which " \ 1199 "the method is considered as hot by the flusher") \ 1200 range(1, max_jint) \ 1201 \ 1202 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1203 "Minimum number of sweeper passes before an nmethod " \ 1204 "can be flushed") \ 1205 range(0, max_intx) \ 1206 \ 1207 product(bool, UseCodeAging, true, \ 1208 "Insert counter to detect warm methods") \ 1209 \ 1210 diagnostic(bool, StressCodeAging, false, \ 1211 "Start with counters compiled in") \ 1212 \ 1213 develop(bool, StressCodeBuffers, false, \ 1214 "Exercise code buffer expansion and other rare state changes") \ 1215 \ 1216 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1217 "Generate extra debugging information for non-safepoints in " \ 1218 "nmethods") \ 1219 \ 1220 product(bool, PrintVMOptions, false, \ 1221 "Print flags that appeared on the command line") \ 1222 \ 1223 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1224 "Ignore unrecognized VM options") \ 1225 \ 1226 product(bool, PrintCommandLineFlags, false, \ 1227 "Print flags specified on command line or set by ergonomics") \ 1228 \ 1229 product(bool, PrintFlagsInitial, false, \ 1230 "Print all VM flags before argument processing and exit VM") \ 1231 \ 1232 product(bool, PrintFlagsFinal, false, \ 1233 "Print all VM flags after argument and ergonomic processing") \ 1234 \ 1235 notproduct(bool, PrintFlagsWithComments, false, \ 1236 "Print all VM flags with default values and descriptions and " \ 1237 "exit") \ 1238 \ 1239 product(bool, PrintFlagsRanges, false, \ 1240 "Print VM flags and their ranges and exit VM") \ 1241 \ 1242 diagnostic(bool, SerializeVMOutput, true, \ 1243 "Use a mutex to serialize output to tty and LogFile") \ 1244 \ 1245 diagnostic(bool, DisplayVMOutput, true, \ 1246 "Display all VM output on the tty, independently of LogVMOutput") \ 1247 \ 1248 diagnostic(bool, LogVMOutput, false, \ 1249 "Save VM output to LogFile") \ 1250 \ 1251 diagnostic(ccstr, LogFile, NULL, \ 1252 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1253 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1254 \ 1255 product(ccstr, ErrorFile, NULL, \ 1256 "If an error occurs, save the error data to this file " \ 1257 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1258 \ 1259 product(bool, ExtensiveErrorReports, \ 1260 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1261 "Error reports are more extensive.") \ 1262 \ 1263 product(bool, DisplayVMOutputToStderr, false, \ 1264 "If DisplayVMOutput is true, display all VM output to stderr") \ 1265 \ 1266 product(bool, DisplayVMOutputToStdout, false, \ 1267 "If DisplayVMOutput is true, display all VM output to stdout") \ 1268 \ 1269 product(bool, UseHeavyMonitors, false, \ 1270 "use heavyweight instead of lightweight Java monitors") \ 1271 \ 1272 product(bool, PrintStringTableStatistics, false, \ 1273 "print statistics about the StringTable and SymbolTable") \ 1274 \ 1275 diagnostic(bool, VerifyStringTableAtExit, false, \ 1276 "verify StringTable contents at exit") \ 1277 \ 1278 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1279 "print histogram of the symbol table") \ 1280 \ 1281 notproduct(bool, ExitVMOnVerifyError, false, \ 1282 "standard exit from VM if bytecode verify error " \ 1283 "(only in debug mode)") \ 1284 \ 1285 diagnostic(ccstr, AbortVMOnException, NULL, \ 1286 "Call fatal if this exception is thrown. Example: " \ 1287 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1288 \ 1289 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1290 "Call fatal if the exception pointed by AbortVMOnException " \ 1291 "has this message") \ 1292 \ 1293 develop(bool, DebugVtables, false, \ 1294 "add debugging code to vtable dispatch") \ 1295 \ 1296 notproduct(bool, PrintVtableStats, false, \ 1297 "print vtables stats at end of run") \ 1298 \ 1299 develop(bool, TraceCreateZombies, false, \ 1300 "trace creation of zombie nmethods") \ 1301 \ 1302 notproduct(bool, IgnoreLockingAssertions, false, \ 1303 "disable locking assertions (for speed)") \ 1304 \ 1305 product(bool, RangeCheckElimination, true, \ 1306 "Eliminate range checks") \ 1307 \ 1308 develop_pd(bool, UncommonNullCast, \ 1309 "track occurrences of null in casts; adjust compiler tactics") \ 1310 \ 1311 develop(bool, TypeProfileCasts, true, \ 1312 "treat casts like calls for purposes of type profiling") \ 1313 \ 1314 develop(bool, TraceLivenessGen, false, \ 1315 "Trace the generation of liveness analysis information") \ 1316 \ 1317 notproduct(bool, TraceLivenessQuery, false, \ 1318 "Trace queries of liveness analysis information") \ 1319 \ 1320 notproduct(bool, CollectIndexSetStatistics, false, \ 1321 "Collect information about IndexSets") \ 1322 \ 1323 develop(bool, UseLoopSafepoints, true, \ 1324 "Generate Safepoint nodes in every loop") \ 1325 \ 1326 develop(intx, FastAllocateSizeLimit, 128*K, \ 1327 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1328 "Inline allocations larger than this in doublewords must go slow")\ 1329 \ 1330 product_pd(bool, CompactStrings, \ 1331 "Enable Strings to use single byte chars in backing store") \ 1332 \ 1333 product_pd(uintx, TypeProfileLevel, \ 1334 "=XYZ, with Z: Type profiling of arguments at call; " \ 1335 "Y: Type profiling of return value at call; " \ 1336 "X: Type profiling of parameters to methods; " \ 1337 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1338 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1339 \ 1340 product(intx, TypeProfileArgsLimit, 2, \ 1341 "max number of call arguments to consider for type profiling") \ 1342 range(0, 16) \ 1343 \ 1344 product(intx, TypeProfileParmsLimit, 2, \ 1345 "max number of incoming parameters to consider for type profiling"\ 1346 ", -1 for all") \ 1347 range(-1, 64) \ 1348 \ 1349 /* statistics */ \ 1350 develop(bool, CountCompiledCalls, false, \ 1351 "Count method invocations") \ 1352 \ 1353 notproduct(bool, CountRuntimeCalls, false, \ 1354 "Count VM runtime calls") \ 1355 \ 1356 develop(bool, CountJNICalls, false, \ 1357 "Count jni method invocations") \ 1358 \ 1359 notproduct(bool, CountJVMCalls, false, \ 1360 "Count jvm method invocations") \ 1361 \ 1362 notproduct(bool, CountRemovableExceptions, false, \ 1363 "Count exceptions that could be replaced by branches due to " \ 1364 "inlining") \ 1365 \ 1366 notproduct(bool, ICMissHistogram, false, \ 1367 "Produce histogram of IC misses") \ 1368 \ 1369 /* interpreter */ \ 1370 product_pd(bool, RewriteBytecodes, \ 1371 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1372 \ 1373 product_pd(bool, RewriteFrequentPairs, \ 1374 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1375 \ 1376 diagnostic(bool, PrintInterpreter, false, \ 1377 "Print the generated interpreter code") \ 1378 \ 1379 product(bool, UseInterpreter, true, \ 1380 "Use interpreter for non-compiled methods") \ 1381 \ 1382 develop(bool, UseFastSignatureHandlers, true, \ 1383 "Use fast signature handlers for native calls") \ 1384 \ 1385 product(bool, UseLoopCounter, true, \ 1386 "Increment invocation counter on backward branch") \ 1387 \ 1388 product_pd(bool, UseOnStackReplacement, \ 1389 "Use on stack replacement, calls runtime if invoc. counter " \ 1390 "overflows in loop") \ 1391 \ 1392 notproduct(bool, TraceOnStackReplacement, false, \ 1393 "Trace on stack replacement") \ 1394 \ 1395 product_pd(bool, PreferInterpreterNativeStubs, \ 1396 "Use always interpreter stubs for native methods invoked via " \ 1397 "interpreter") \ 1398 \ 1399 develop(bool, CountBytecodes, false, \ 1400 "Count number of bytecodes executed") \ 1401 \ 1402 develop(bool, PrintBytecodeHistogram, false, \ 1403 "Print histogram of the executed bytecodes") \ 1404 \ 1405 develop(bool, PrintBytecodePairHistogram, false, \ 1406 "Print histogram of the executed bytecode pairs") \ 1407 \ 1408 diagnostic(bool, PrintSignatureHandlers, false, \ 1409 "Print code generated for native method signature handlers") \ 1410 \ 1411 develop(bool, VerifyOops, false, \ 1412 "Do plausibility checks for oops") \ 1413 \ 1414 develop(bool, CheckUnhandledOops, false, \ 1415 "Check for unhandled oops in VM code") \ 1416 \ 1417 develop(bool, VerifyJNIFields, trueInDebug, \ 1418 "Verify jfieldIDs for instance fields") \ 1419 \ 1420 notproduct(bool, VerifyJNIEnvThread, false, \ 1421 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1422 "from JNI") \ 1423 \ 1424 develop(bool, VerifyFPU, false, \ 1425 "Verify FPU state (check for NaN's, etc.)") \ 1426 \ 1427 develop(bool, VerifyThread, false, \ 1428 "Watch the thread register for corruption (SPARC only)") \ 1429 \ 1430 develop(bool, VerifyActivationFrameSize, false, \ 1431 "Verify that activation frame didn't become smaller than its " \ 1432 "minimal size") \ 1433 \ 1434 develop(bool, TraceFrequencyInlining, false, \ 1435 "Trace frequency based inlining") \ 1436 \ 1437 develop_pd(bool, InlineIntrinsics, \ 1438 "Inline intrinsics that can be statically resolved") \ 1439 \ 1440 product_pd(bool, ProfileInterpreter, \ 1441 "Profile at the bytecode level during interpretation") \ 1442 \ 1443 develop(bool, TraceProfileInterpreter, false, \ 1444 "Trace profiling at the bytecode level during interpretation. " \ 1445 "This outputs the profiling information collected to improve " \ 1446 "jit compilation.") \ 1447 \ 1448 develop_pd(bool, ProfileTraps, \ 1449 "Profile deoptimization traps at the bytecode level") \ 1450 \ 1451 product(intx, ProfileMaturityPercentage, 20, \ 1452 "number of method invocations/branches (expressed as % of " \ 1453 "CompileThreshold) before using the method's profile") \ 1454 range(0, 100) \ 1455 \ 1456 diagnostic(bool, PrintMethodData, false, \ 1457 "Print the results of +ProfileInterpreter at end of run") \ 1458 \ 1459 develop(bool, VerifyDataPointer, trueInDebug, \ 1460 "Verify the method data pointer during interpreter profiling") \ 1461 \ 1462 develop(bool, VerifyCompiledCode, false, \ 1463 "Include miscellaneous runtime verifications in nmethod code; " \ 1464 "default off because it disturbs nmethod size heuristics") \ 1465 \ 1466 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1467 "Manually make GC thread crash then dump java stack trace; " \ 1468 "Test only") \ 1469 \ 1470 /* compilation */ \ 1471 product(bool, UseCompiler, true, \ 1472 "Use Just-In-Time compilation") \ 1473 \ 1474 product(bool, UseCounterDecay, true, \ 1475 "Adjust recompilation counters") \ 1476 \ 1477 develop(intx, CounterHalfLifeTime, 30, \ 1478 "Half-life time of invocation counters (in seconds)") \ 1479 \ 1480 develop(intx, CounterDecayMinIntervalLength, 500, \ 1481 "The minimum interval (in milliseconds) between invocation of " \ 1482 "CounterDecay") \ 1483 \ 1484 product(bool, AlwaysCompileLoopMethods, false, \ 1485 "When using recompilation, never interpret methods " \ 1486 "containing loops") \ 1487 \ 1488 product(bool, DontCompileHugeMethods, true, \ 1489 "Do not compile methods > HugeMethodLimit") \ 1490 \ 1491 /* Bytecode escape analysis estimation. */ \ 1492 product(bool, EstimateArgEscape, true, \ 1493 "Analyze bytecodes to estimate escape state of arguments") \ 1494 \ 1495 product(intx, BCEATraceLevel, 0, \ 1496 "How much tracing to do of bytecode escape analysis estimates " \ 1497 "(0-3)") \ 1498 range(0, 3) \ 1499 \ 1500 product(intx, MaxBCEAEstimateLevel, 5, \ 1501 "Maximum number of nested calls that are analyzed by BC EA") \ 1502 range(0, max_jint) \ 1503 \ 1504 product(intx, MaxBCEAEstimateSize, 150, \ 1505 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1506 range(0, max_jint) \ 1507 \ 1508 product(intx, AllocatePrefetchStyle, 1, \ 1509 "0 = no prefetch, " \ 1510 "1 = generate prefetch instructions for each allocation, " \ 1511 "2 = use TLAB watermark to gate allocation prefetch, " \ 1512 "3 = generate one prefetch instruction per cache line") \ 1513 range(0, 3) \ 1514 \ 1515 product(intx, AllocatePrefetchDistance, -1, \ 1516 "Distance to prefetch ahead of allocation pointer. " \ 1517 "-1: use system-specific value (automatically determined") \ 1518 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 1519 \ 1520 product(intx, AllocatePrefetchLines, 3, \ 1521 "Number of lines to prefetch ahead of array allocation pointer") \ 1522 range(1, 64) \ 1523 \ 1524 product(intx, AllocateInstancePrefetchLines, 1, \ 1525 "Number of lines to prefetch ahead of instance allocation " \ 1526 "pointer") \ 1527 range(1, 64) \ 1528 \ 1529 product(intx, AllocatePrefetchStepSize, 16, \ 1530 "Step size in bytes of sequential prefetch instructions") \ 1531 range(1, 512) \ 1532 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1533 \ 1534 product(intx, AllocatePrefetchInstr, 0, \ 1535 "Select instruction to prefetch ahead of allocation pointer") \ 1536 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1537 \ 1538 /* deoptimization */ \ 1539 develop(bool, TraceDeoptimization, false, \ 1540 "Trace deoptimization") \ 1541 \ 1542 develop(bool, PrintDeoptimizationDetails, false, \ 1543 "Print more information about deoptimization") \ 1544 \ 1545 develop(bool, DebugDeoptimization, false, \ 1546 "Tracing various information while debugging deoptimization") \ 1547 \ 1548 product(intx, SelfDestructTimer, 0, \ 1549 "Will cause VM to terminate after a given time (in minutes) " \ 1550 "(0 means off)") \ 1551 range(0, max_intx) \ 1552 \ 1553 product(intx, MaxJavaStackTraceDepth, 1024, \ 1554 "The maximum number of lines in the stack trace for Java " \ 1555 "exceptions (0 means all)") \ 1556 range(0, max_jint/2) \ 1557 \ 1558 /* notice: the max range value here is max_jint, not max_intx */ \ 1559 /* because of overflow issue */ \ 1560 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1561 "Guarantee a safepoint (at least) every so many milliseconds " \ 1562 "(0 means none)") \ 1563 range(0, max_jint) \ 1564 \ 1565 product(intx, SafepointTimeoutDelay, 10000, \ 1566 "Delay in milliseconds for option SafepointTimeout") \ 1567 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1568 NOT_LP64(range(0, max_intx)) \ 1569 \ 1570 product(intx, NmethodSweepActivity, 10, \ 1571 "Removes cold nmethods from code cache if > 0. Higher values " \ 1572 "result in more aggressive sweeping") \ 1573 range(0, 2000) \ 1574 \ 1575 notproduct(bool, LogSweeper, false, \ 1576 "Keep a ring buffer of sweeper activity") \ 1577 \ 1578 notproduct(intx, SweeperLogEntries, 1024, \ 1579 "Number of records in the ring buffer of sweeper activity") \ 1580 \ 1581 notproduct(intx, MemProfilingInterval, 500, \ 1582 "Time between each invocation of the MemProfiler") \ 1583 \ 1584 develop(intx, MallocCatchPtr, -1, \ 1585 "Hit breakpoint when mallocing/freeing this pointer") \ 1586 \ 1587 notproduct(ccstrlist, SuppressErrorAt, "", \ 1588 "List of assertions (file:line) to muzzle") \ 1589 \ 1590 develop(intx, StackPrintLimit, 100, \ 1591 "number of stack frames to print in VM-level stack dump") \ 1592 \ 1593 notproduct(intx, MaxElementPrintSize, 256, \ 1594 "maximum number of elements to print") \ 1595 \ 1596 notproduct(intx, MaxSubklassPrintSize, 4, \ 1597 "maximum number of subklasses to print when printing klass") \ 1598 \ 1599 product(intx, MaxInlineLevel, 9, \ 1600 "maximum number of nested calls that are inlined") \ 1601 range(0, max_jint) \ 1602 \ 1603 product(intx, MaxRecursiveInlineLevel, 1, \ 1604 "maximum number of nested recursive calls that are inlined") \ 1605 range(0, max_jint) \ 1606 \ 1607 develop(intx, MaxForceInlineLevel, 100, \ 1608 "maximum number of nested calls that are forced for inlining " \ 1609 "(using CompileCommand or marked w/ @ForceInline)") \ 1610 range(0, max_jint) \ 1611 \ 1612 product_pd(intx, InlineSmallCode, \ 1613 "Only inline already compiled methods if their code size is " \ 1614 "less than this") \ 1615 range(0, max_jint) \ 1616 \ 1617 product(intx, MaxInlineSize, 35, \ 1618 "The maximum bytecode size of a method to be inlined") \ 1619 range(0, max_jint) \ 1620 \ 1621 product_pd(intx, FreqInlineSize, \ 1622 "The maximum bytecode size of a frequent method to be inlined") \ 1623 range(0, max_jint) \ 1624 \ 1625 product(intx, MaxTrivialSize, 6, \ 1626 "The maximum bytecode size of a trivial method to be inlined") \ 1627 range(0, max_jint) \ 1628 \ 1629 product(intx, MinInliningThreshold, 250, \ 1630 "The minimum invocation count a method needs to have to be " \ 1631 "inlined") \ 1632 range(0, max_jint) \ 1633 \ 1634 develop(intx, MethodHistogramCutoff, 100, \ 1635 "The cutoff value for method invocation histogram (+CountCalls)") \ 1636 \ 1637 develop(intx, DontYieldALotInterval, 10, \ 1638 "Interval between which yields will be dropped (milliseconds)") \ 1639 \ 1640 notproduct(intx, DeoptimizeALotInterval, 5, \ 1641 "Number of exits until DeoptimizeALot kicks in") \ 1642 \ 1643 notproduct(intx, ZombieALotInterval, 5, \ 1644 "Number of exits until ZombieALot kicks in") \ 1645 \ 1646 diagnostic(uintx, MallocMaxTestWords, 0, \ 1647 "If non-zero, maximum number of words that malloc/realloc can " \ 1648 "allocate (for testing only)") \ 1649 range(0, max_uintx) \ 1650 \ 1651 product(intx, TypeProfileWidth, 2, \ 1652 "Number of receiver types to record in call/cast profile") \ 1653 range(0, 8) \ 1654 \ 1655 develop(intx, BciProfileWidth, 2, \ 1656 "Number of return bci's to record in ret profile") \ 1657 \ 1658 product(intx, PerMethodRecompilationCutoff, 400, \ 1659 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1660 range(-1, max_intx) \ 1661 \ 1662 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1663 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1664 range(-1, max_intx) \ 1665 \ 1666 product(intx, PerMethodTrapLimit, 100, \ 1667 "Limit on traps (of one kind) in a method (includes inlines)") \ 1668 range(0, max_jint) \ 1669 \ 1670 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1671 "Limit on speculative traps (of one kind) in a method " \ 1672 "(includes inlines)") \ 1673 range(0, max_jint) \ 1674 \ 1675 product(intx, PerBytecodeTrapLimit, 4, \ 1676 "Limit on traps (of one kind) at a particular BCI") \ 1677 range(0, max_jint) \ 1678 \ 1679 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1680 "Extra method data trap entries for speculation") \ 1681 \ 1682 develop(intx, InlineFrequencyRatio, 20, \ 1683 "Ratio of call site execution to caller method invocation") \ 1684 range(0, max_jint) \ 1685 \ 1686 diagnostic_pd(intx, InlineFrequencyCount, \ 1687 "Count of call site execution necessary to trigger frequent " \ 1688 "inlining") \ 1689 range(0, max_jint) \ 1690 \ 1691 develop(intx, InlineThrowCount, 50, \ 1692 "Force inlining of interpreted methods that throw this often") \ 1693 range(0, max_jint) \ 1694 \ 1695 develop(intx, InlineThrowMaxSize, 200, \ 1696 "Force inlining of throwing methods smaller than this") \ 1697 range(0, max_jint) \ 1698 \ 1699 develop(intx, ProfilerNodeSize, 1024, \ 1700 "Size in K to allocate for the Profile Nodes of each thread") \ 1701 range(0, 1024) \ 1702 \ 1703 product_pd(size_t, MetaspaceSize, \ 1704 "Initial threshold (in bytes) at which a garbage collection " \ 1705 "is done to reduce Metaspace usage") \ 1706 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1707 \ 1708 product(size_t, MaxMetaspaceSize, max_uintx, \ 1709 "Maximum size of Metaspaces (in bytes)") \ 1710 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1711 \ 1712 product(size_t, CompressedClassSpaceSize, 1*G, \ 1713 "Maximum size of class area in Metaspace when compressed " \ 1714 "class pointers are used") \ 1715 range(1*M, 3*G) \ 1716 \ 1717 manageable(uintx, MinHeapFreeRatio, 40, \ 1718 "The minimum percentage of heap free after GC to avoid expansion."\ 1719 " For most GCs this applies to the old generation. In G1 and" \ 1720 " ParallelGC it applies to the whole heap.") \ 1721 range(0, 100) \ 1722 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1723 \ 1724 manageable(uintx, MaxHeapFreeRatio, 70, \ 1725 "The maximum percentage of heap free after GC to avoid shrinking."\ 1726 " For most GCs this applies to the old generation. In G1 and" \ 1727 " ParallelGC it applies to the whole heap.") \ 1728 range(0, 100) \ 1729 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1730 \ 1731 product(bool, ShrinkHeapInSteps, true, \ 1732 "When disabled, informs the GC to shrink the java heap directly" \ 1733 " to the target size at the next full GC rather than requiring" \ 1734 " smaller steps during multiple full GCs.") \ 1735 \ 1736 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1737 "Number of milliseconds per MB of free space in the heap") \ 1738 range(0, max_intx) \ 1739 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1740 \ 1741 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1742 "The minimum change in heap space due to GC (in bytes)") \ 1743 range(0, max_uintx) \ 1744 \ 1745 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1746 "The minimum expansion of Metaspace (in bytes)") \ 1747 range(0, max_uintx) \ 1748 \ 1749 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1750 "The maximum percentage of Metaspace free after GC to avoid " \ 1751 "shrinking") \ 1752 range(0, 100) \ 1753 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1754 \ 1755 product(uintx, MinMetaspaceFreeRatio, 40, \ 1756 "The minimum percentage of Metaspace free after GC to avoid " \ 1757 "expansion") \ 1758 range(0, 99) \ 1759 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1760 \ 1761 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1762 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1763 range(0, max_uintx) \ 1764 \ 1765 /* stack parameters */ \ 1766 product_pd(intx, StackYellowPages, \ 1767 "Number of yellow zone (recoverable overflows) pages of size " \ 1768 "4KB. If pages are bigger yellow zone is aligned up.") \ 1769 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1770 \ 1771 product_pd(intx, StackRedPages, \ 1772 "Number of red zone (unrecoverable overflows) pages of size " \ 1773 "4KB. If pages are bigger red zone is aligned up.") \ 1774 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1775 \ 1776 product_pd(intx, StackReservedPages, \ 1777 "Number of reserved zone (reserved to annotated methods) pages" \ 1778 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1779 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1780 \ 1781 product(bool, RestrictReservedStack, true, \ 1782 "Restrict @ReservedStackAccess to trusted classes") \ 1783 \ 1784 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1785 product_pd(intx, StackShadowPages, \ 1786 "Number of shadow zone (for overflow checking) pages of size " \ 1787 "4KB. If pages are bigger shadow zone is aligned up. " \ 1788 "This should exceed the depth of the VM and native call stack.") \ 1789 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1790 \ 1791 product_pd(intx, ThreadStackSize, \ 1792 "Thread Stack Size (in Kbytes)") \ 1793 range(0, 1 * M) \ 1794 \ 1795 product_pd(intx, VMThreadStackSize, \ 1796 "Non-Java Thread Stack Size (in Kbytes)") \ 1797 range(0, max_intx/(1 * K)) \ 1798 \ 1799 product_pd(intx, CompilerThreadStackSize, \ 1800 "Compiler Thread Stack Size (in Kbytes)") \ 1801 range(0, max_intx/(1 * K)) \ 1802 \ 1803 develop_pd(size_t, JVMInvokeMethodSlack, \ 1804 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1805 \ 1806 /* code cache parameters */ \ 1807 develop_pd(uintx, CodeCacheSegmentSize, \ 1808 "Code cache segment size (in bytes) - smallest unit of " \ 1809 "allocation") \ 1810 range(1, 1024) \ 1811 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1812 \ 1813 develop_pd(intx, CodeEntryAlignment, \ 1814 "Code entry alignment for generated code (in bytes)") \ 1815 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1816 \ 1817 product_pd(intx, OptoLoopAlignment, \ 1818 "Align inner loops to zero relative to this modulus") \ 1819 range(1, 16) \ 1820 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1821 \ 1822 product_pd(uintx, InitialCodeCacheSize, \ 1823 "Initial code cache size (in bytes)") \ 1824 range(os::vm_page_size(), max_uintx) \ 1825 \ 1826 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1827 "Minimum code cache size (in bytes) required to start VM.") \ 1828 range(0, max_uintx) \ 1829 \ 1830 product(bool, SegmentedCodeCache, false, \ 1831 "Use a segmented code cache") \ 1832 \ 1833 product_pd(uintx, ReservedCodeCacheSize, \ 1834 "Reserved code cache size (in bytes) - maximum code cache size") \ 1835 range(os::vm_page_size(), max_uintx) \ 1836 \ 1837 product_pd(uintx, NonProfiledCodeHeapSize, \ 1838 "Size of code heap with non-profiled methods (in bytes)") \ 1839 range(0, max_uintx) \ 1840 \ 1841 product_pd(uintx, ProfiledCodeHeapSize, \ 1842 "Size of code heap with profiled methods (in bytes)") \ 1843 range(0, max_uintx) \ 1844 \ 1845 product_pd(uintx, NonNMethodCodeHeapSize, \ 1846 "Size of code heap with non-nmethods (in bytes)") \ 1847 range(os::vm_page_size(), max_uintx) \ 1848 \ 1849 product_pd(uintx, CodeCacheExpansionSize, \ 1850 "Code cache expansion size (in bytes)") \ 1851 range(32*K, max_uintx) \ 1852 \ 1853 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1854 "Minimum number of segments in a code cache block") \ 1855 range(1, 100) \ 1856 \ 1857 notproduct(bool, ExitOnFullCodeCache, false, \ 1858 "Exit the VM if we fill the code cache") \ 1859 \ 1860 product(bool, UseCodeCacheFlushing, true, \ 1861 "Remove cold/old nmethods from the code cache") \ 1862 \ 1863 product(uintx, StartAggressiveSweepingAt, 10, \ 1864 "Start aggressive sweeping if X[%] of the code cache is free." \ 1865 "Segmented code cache: X[%] of the non-profiled heap." \ 1866 "Non-segmented code cache: X[%] of the total code cache") \ 1867 range(0, 100) \ 1868 \ 1869 /* AOT parameters */ \ 1870 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 1871 "Use AOT compiled files") \ 1872 \ 1873 product(ccstrlist, AOTLibrary, NULL, \ 1874 "AOT library") \ 1875 \ 1876 product(bool, PrintAOT, false, \ 1877 "Print used AOT klasses and methods") \ 1878 \ 1879 notproduct(bool, PrintAOTStatistics, false, \ 1880 "Print AOT statistics") \ 1881 \ 1882 diagnostic(bool, UseAOTStrictLoading, false, \ 1883 "Exit the VM if any of the AOT libraries has invalid config") \ 1884 \ 1885 product(bool, CalculateClassFingerprint, false, \ 1886 "Calculate class fingerprint") \ 1887 \ 1888 /* interpreter debugging */ \ 1889 develop(intx, BinarySwitchThreshold, 5, \ 1890 "Minimal number of lookupswitch entries for rewriting to binary " \ 1891 "switch") \ 1892 \ 1893 develop(intx, StopInterpreterAt, 0, \ 1894 "Stop interpreter execution at specified bytecode number") \ 1895 \ 1896 develop(intx, TraceBytecodesAt, 0, \ 1897 "Trace bytecodes starting with specified bytecode number") \ 1898 \ 1899 /* compiler interface */ \ 1900 develop(intx, CIStart, 0, \ 1901 "The id of the first compilation to permit") \ 1902 \ 1903 develop(intx, CIStop, max_jint, \ 1904 "The id of the last compilation to permit") \ 1905 \ 1906 develop(intx, CIStartOSR, 0, \ 1907 "The id of the first osr compilation to permit " \ 1908 "(CICountOSR must be on)") \ 1909 \ 1910 develop(intx, CIStopOSR, max_jint, \ 1911 "The id of the last osr compilation to permit " \ 1912 "(CICountOSR must be on)") \ 1913 \ 1914 develop(intx, CIBreakAtOSR, -1, \ 1915 "The id of osr compilation to break at") \ 1916 \ 1917 develop(intx, CIBreakAt, -1, \ 1918 "The id of compilation to break at") \ 1919 \ 1920 product(ccstrlist, CompileOnly, "", \ 1921 "List of methods (pkg/class.name) to restrict compilation to") \ 1922 \ 1923 product(ccstr, CompileCommandFile, NULL, \ 1924 "Read compiler commands from this file [.hotspot_compiler]") \ 1925 \ 1926 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1927 "Read compiler directives from this file") \ 1928 \ 1929 product(ccstrlist, CompileCommand, "", \ 1930 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1931 \ 1932 develop(bool, ReplayCompiles, false, \ 1933 "Enable replay of compilations from ReplayDataFile") \ 1934 \ 1935 product(ccstr, ReplayDataFile, NULL, \ 1936 "File containing compilation replay information" \ 1937 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1938 \ 1939 product(ccstr, InlineDataFile, NULL, \ 1940 "File containing inlining replay information" \ 1941 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1942 \ 1943 develop(intx, ReplaySuppressInitializers, 2, \ 1944 "Control handling of class initialization during replay: " \ 1945 "0 - don't do anything special; " \ 1946 "1 - treat all class initializers as empty; " \ 1947 "2 - treat class initializers for application classes as empty; " \ 1948 "3 - allow all class initializers to run during bootstrap but " \ 1949 " pretend they are empty after starting replay") \ 1950 range(0, 3) \ 1951 \ 1952 develop(bool, ReplayIgnoreInitErrors, false, \ 1953 "Ignore exceptions thrown during initialization for replay") \ 1954 \ 1955 product(bool, DumpReplayDataOnError, true, \ 1956 "Record replay data for crashing compiler threads") \ 1957 \ 1958 product(bool, CICompilerCountPerCPU, false, \ 1959 "1 compiler thread for log(N CPUs)") \ 1960 \ 1961 notproduct(intx, CICrashAt, -1, \ 1962 "id of compilation to trigger assert in compiler thread for " \ 1963 "the purpose of testing, e.g. generation of replay data") \ 1964 notproduct(bool, CIObjectFactoryVerify, false, \ 1965 "enable potentially expensive verification in ciObjectFactory") \ 1966 \ 1967 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1968 "Abort VM when method had failed to compile.") \ 1969 \ 1970 /* Priorities */ \ 1971 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1972 \ 1973 product(intx, ThreadPriorityPolicy, 0, \ 1974 "0 : Normal. "\ 1975 " VM chooses priorities that are appropriate for normal "\ 1976 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1977 " to normal native priority. Java priorities below " \ 1978 " NORM_PRIORITY map to lower native priority values. On "\ 1979 " Windows applications are allowed to use higher native "\ 1980 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1981 " not use the highest possible native priority, "\ 1982 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1983 " system threads. On Linux thread priorities are ignored "\ 1984 " because the OS does not support static priority in "\ 1985 " SCHED_OTHER scheduling class which is the only choice for "\ 1986 " non-root, non-realtime applications. "\ 1987 "1 : Aggressive. "\ 1988 " Java thread priorities map over to the entire range of "\ 1989 " native thread priorities. Higher Java thread priorities map "\ 1990 " to higher native thread priorities. This policy should be "\ 1991 " used with care, as sometimes it can cause performance "\ 1992 " degradation in the application and/or the entire system. On "\ 1993 " Linux/BSD/macOS this policy requires root privilege or an "\ 1994 " extended capability.") \ 1995 range(0, 1) \ 1996 \ 1997 product(bool, ThreadPriorityVerbose, false, \ 1998 "Print priority changes") \ 1999 \ 2000 product(intx, CompilerThreadPriority, -1, \ 2001 "The native priority at which compiler threads should run " \ 2002 "(-1 means no change)") \ 2003 range(min_jint, max_jint) \ 2004 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 2005 \ 2006 product(intx, VMThreadPriority, -1, \ 2007 "The native priority at which the VM thread should run " \ 2008 "(-1 means no change)") \ 2009 range(-1, 127) \ 2010 \ 2011 product(intx, JavaPriority1_To_OSPriority, -1, \ 2012 "Map Java priorities to OS priorities") \ 2013 range(-1, 127) \ 2014 \ 2015 product(intx, JavaPriority2_To_OSPriority, -1, \ 2016 "Map Java priorities to OS priorities") \ 2017 range(-1, 127) \ 2018 \ 2019 product(intx, JavaPriority3_To_OSPriority, -1, \ 2020 "Map Java priorities to OS priorities") \ 2021 range(-1, 127) \ 2022 \ 2023 product(intx, JavaPriority4_To_OSPriority, -1, \ 2024 "Map Java priorities to OS priorities") \ 2025 range(-1, 127) \ 2026 \ 2027 product(intx, JavaPriority5_To_OSPriority, -1, \ 2028 "Map Java priorities to OS priorities") \ 2029 range(-1, 127) \ 2030 \ 2031 product(intx, JavaPriority6_To_OSPriority, -1, \ 2032 "Map Java priorities to OS priorities") \ 2033 range(-1, 127) \ 2034 \ 2035 product(intx, JavaPriority7_To_OSPriority, -1, \ 2036 "Map Java priorities to OS priorities") \ 2037 range(-1, 127) \ 2038 \ 2039 product(intx, JavaPriority8_To_OSPriority, -1, \ 2040 "Map Java priorities to OS priorities") \ 2041 range(-1, 127) \ 2042 \ 2043 product(intx, JavaPriority9_To_OSPriority, -1, \ 2044 "Map Java priorities to OS priorities") \ 2045 range(-1, 127) \ 2046 \ 2047 product(intx, JavaPriority10_To_OSPriority,-1, \ 2048 "Map Java priorities to OS priorities") \ 2049 range(-1, 127) \ 2050 \ 2051 experimental(bool, UseCriticalJavaThreadPriority, false, \ 2052 "Java thread priority 10 maps to critical scheduling priority") \ 2053 \ 2054 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 2055 "Compiler thread(s) run at critical scheduling priority") \ 2056 \ 2057 experimental(bool, UseCriticalCMSThreadPriority, false, \ 2058 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 2059 \ 2060 develop(intx, NewCodeParameter, 0, \ 2061 "Testing Only: Create a dedicated integer parameter before " \ 2062 "putback") \ 2063 \ 2064 /* new oopmap storage allocation */ \ 2065 develop(intx, MinOopMapAllocation, 8, \ 2066 "Minimum number of OopMap entries in an OopMapSet") \ 2067 \ 2068 /* Background Compilation */ \ 2069 develop(intx, LongCompileThreshold, 50, \ 2070 "Used with +TraceLongCompiles") \ 2071 \ 2072 /* recompilation */ \ 2073 product_pd(intx, CompileThreshold, \ 2074 "number of interpreted method invocations before (re-)compiling") \ 2075 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 2076 \ 2077 product(double, CompileThresholdScaling, 1.0, \ 2078 "Factor to control when first compilation happens " \ 2079 "(both with and without tiered compilation): " \ 2080 "values greater than 1.0 delay counter overflow, " \ 2081 "values between 0 and 1.0 rush counter overflow, " \ 2082 "value of 1.0 leaves compilation thresholds unchanged " \ 2083 "value of 0.0 is equivalent to -Xint. " \ 2084 "" \ 2085 "Flag can be set as per-method option. " \ 2086 "If a value is specified for a method, compilation thresholds " \ 2087 "for that method are scaled by both the value of the global flag "\ 2088 "and the value of the per-method flag.") \ 2089 range(0.0, DBL_MAX) \ 2090 \ 2091 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 2092 "Interpreter (tier 0) invocation notification frequency") \ 2093 range(0, 30) \ 2094 \ 2095 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 2096 "C1 without MDO (tier 2) invocation notification frequency") \ 2097 range(0, 30) \ 2098 \ 2099 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 2100 "C1 with MDO profiling (tier 3) invocation notification " \ 2101 "frequency") \ 2102 range(0, 30) \ 2103 \ 2104 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 2105 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 2106 range(0, 30) \ 2107 \ 2108 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 2109 "Interpreter (tier 0) invocation notification frequency") \ 2110 range(0, 30) \ 2111 \ 2112 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 2113 "C1 without MDO (tier 2) invocation notification frequency") \ 2114 range(0, 30) \ 2115 \ 2116 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 2117 "C1 with MDO profiling (tier 3) invocation notification " \ 2118 "frequency") \ 2119 range(0, 30) \ 2120 \ 2121 product(intx, Tier2CompileThreshold, 0, \ 2122 "threshold at which tier 2 compilation is invoked") \ 2123 range(0, max_jint) \ 2124 \ 2125 product(intx, Tier2BackEdgeThreshold, 0, \ 2126 "Back edge threshold at which tier 2 compilation is invoked") \ 2127 range(0, max_jint) \ 2128 \ 2129 product(intx, Tier3InvocationThreshold, 200, \ 2130 "Compile if number of method invocations crosses this " \ 2131 "threshold") \ 2132 range(0, max_jint) \ 2133 \ 2134 product(intx, Tier3MinInvocationThreshold, 100, \ 2135 "Minimum invocation to compile at tier 3") \ 2136 range(0, max_jint) \ 2137 \ 2138 product(intx, Tier3CompileThreshold, 2000, \ 2139 "Threshold at which tier 3 compilation is invoked (invocation " \ 2140 "minimum must be satisfied)") \ 2141 range(0, max_jint) \ 2142 \ 2143 product(intx, Tier3BackEdgeThreshold, 60000, \ 2144 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2145 range(0, max_jint) \ 2146 \ 2147 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2148 "Compile if number of method invocations crosses this " \ 2149 "threshold if coming from AOT") \ 2150 range(0, max_jint) \ 2151 \ 2152 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2153 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2154 range(0, max_jint) \ 2155 \ 2156 product(intx, Tier3AOTCompileThreshold, 15000, \ 2157 "Threshold at which tier 3 compilation is invoked (invocation " \ 2158 "minimum must be satisfied) if coming from AOT") \ 2159 range(0, max_jint) \ 2160 \ 2161 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2162 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2163 "if coming from AOT") \ 2164 range(0, max_jint) \ 2165 \ 2166 product(intx, Tier4InvocationThreshold, 5000, \ 2167 "Compile if number of method invocations crosses this " \ 2168 "threshold") \ 2169 range(0, max_jint) \ 2170 \ 2171 product(intx, Tier4MinInvocationThreshold, 600, \ 2172 "Minimum invocation to compile at tier 4") \ 2173 range(0, max_jint) \ 2174 \ 2175 product(intx, Tier4CompileThreshold, 15000, \ 2176 "Threshold at which tier 4 compilation is invoked (invocation " \ 2177 "minimum must be satisfied") \ 2178 range(0, max_jint) \ 2179 \ 2180 product(intx, Tier4BackEdgeThreshold, 40000, \ 2181 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2182 range(0, max_jint) \ 2183 \ 2184 product(intx, Tier3DelayOn, 5, \ 2185 "If C2 queue size grows over this amount per compiler thread " \ 2186 "stop compiling at tier 3 and start compiling at tier 2") \ 2187 range(0, max_jint) \ 2188 \ 2189 product(intx, Tier3DelayOff, 2, \ 2190 "If C2 queue size is less than this amount per compiler thread " \ 2191 "allow methods compiled at tier 2 transition to tier 3") \ 2192 range(0, max_jint) \ 2193 \ 2194 product(intx, Tier3LoadFeedback, 5, \ 2195 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2196 "reaches this amount per compiler thread") \ 2197 range(0, max_jint) \ 2198 \ 2199 product(intx, Tier4LoadFeedback, 3, \ 2200 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2201 "reaches this amount per compiler thread") \ 2202 range(0, max_jint) \ 2203 \ 2204 product(intx, TieredCompileTaskTimeout, 50, \ 2205 "Kill compile task if method was not used within " \ 2206 "given timeout in milliseconds") \ 2207 range(0, max_intx) \ 2208 \ 2209 product(intx, TieredStopAtLevel, 4, \ 2210 "Stop at given compilation level") \ 2211 range(0, 4) \ 2212 \ 2213 product(intx, Tier0ProfilingStartPercentage, 200, \ 2214 "Start profiling in interpreter if the counters exceed tier 3 " \ 2215 "thresholds by the specified percentage") \ 2216 range(0, max_jint) \ 2217 \ 2218 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2219 "Increase the compile threshold for C1 compilation if the code " \ 2220 "cache is filled by the specified percentage") \ 2221 range(0, 99) \ 2222 \ 2223 product(intx, TieredRateUpdateMinTime, 1, \ 2224 "Minimum rate sampling interval (in milliseconds)") \ 2225 range(0, max_intx) \ 2226 \ 2227 product(intx, TieredRateUpdateMaxTime, 25, \ 2228 "Maximum rate sampling interval (in milliseconds)") \ 2229 range(0, max_intx) \ 2230 \ 2231 product_pd(bool, TieredCompilation, \ 2232 "Enable tiered compilation") \ 2233 \ 2234 product(bool, PrintTieredEvents, false, \ 2235 "Print tiered events notifications") \ 2236 \ 2237 product_pd(intx, OnStackReplacePercentage, \ 2238 "NON_TIERED number of method invocations/branches (expressed as " \ 2239 "% of CompileThreshold) before (re-)compiling OSR code") \ 2240 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2241 \ 2242 product(intx, InterpreterProfilePercentage, 33, \ 2243 "NON_TIERED number of method invocations/branches (expressed as " \ 2244 "% of CompileThreshold) before profiling in the interpreter") \ 2245 range(0, 100) \ 2246 \ 2247 develop(intx, MaxRecompilationSearchLength, 10, \ 2248 "The maximum number of frames to inspect when searching for " \ 2249 "recompilee") \ 2250 \ 2251 develop(intx, MaxInterpretedSearchLength, 3, \ 2252 "The maximum number of interpreted frames to skip when searching "\ 2253 "for recompilee") \ 2254 \ 2255 develop(intx, DesiredMethodLimit, 8000, \ 2256 "The desired maximum method size (in bytecodes) after inlining") \ 2257 \ 2258 develop(intx, HugeMethodLimit, 8000, \ 2259 "Don't compile methods larger than this if " \ 2260 "+DontCompileHugeMethods") \ 2261 \ 2262 /* Properties for Java libraries */ \ 2263 \ 2264 product(uint64_t, MaxDirectMemorySize, 0, \ 2265 "Maximum total size of NIO direct-buffer allocations") \ 2266 range(0, max_jlong) \ 2267 \ 2268 /* Flags used for temporary code during development */ \ 2269 \ 2270 diagnostic(bool, UseNewCode, false, \ 2271 "Testing Only: Use the new version while testing") \ 2272 \ 2273 diagnostic(bool, UseNewCode2, false, \ 2274 "Testing Only: Use the new version while testing") \ 2275 \ 2276 diagnostic(bool, UseNewCode3, false, \ 2277 "Testing Only: Use the new version while testing") \ 2278 \ 2279 /* flags for performance data collection */ \ 2280 \ 2281 product(bool, UsePerfData, true, \ 2282 "Flag to disable jvmstat instrumentation for performance testing "\ 2283 "and problem isolation purposes") \ 2284 \ 2285 product(bool, PerfDataSaveToFile, false, \ 2286 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2287 \ 2288 product(ccstr, PerfDataSaveFile, NULL, \ 2289 "Save PerfData memory to the specified absolute pathname. " \ 2290 "The string %p in the file name (if present) " \ 2291 "will be replaced by pid") \ 2292 \ 2293 product(intx, PerfDataSamplingInterval, 50, \ 2294 "Data sampling interval (in milliseconds)") \ 2295 range(PeriodicTask::min_interval, max_jint) \ 2296 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2297 \ 2298 product(bool, PerfDisableSharedMem, false, \ 2299 "Store performance data in standard memory") \ 2300 \ 2301 product(intx, PerfDataMemorySize, 32*K, \ 2302 "Size of performance data memory region. Will be rounded " \ 2303 "up to a multiple of the native os page size.") \ 2304 range(128, 32*64*K) \ 2305 \ 2306 product(intx, PerfMaxStringConstLength, 1024, \ 2307 "Maximum PerfStringConstant string length before truncation") \ 2308 range(32, 32*K) \ 2309 \ 2310 product(bool, PerfAllowAtExitRegistration, false, \ 2311 "Allow registration of atexit() methods") \ 2312 \ 2313 product(bool, PerfBypassFileSystemCheck, false, \ 2314 "Bypass Win32 file system criteria checks (Windows Only)") \ 2315 \ 2316 product(intx, UnguardOnExecutionViolation, 0, \ 2317 "Unguard page and retry on no-execute fault (Win32 only) " \ 2318 "0=off, 1=conservative, 2=aggressive") \ 2319 range(0, 2) \ 2320 \ 2321 /* Serviceability Support */ \ 2322 \ 2323 product(bool, ManagementServer, false, \ 2324 "Create JMX Management Server") \ 2325 \ 2326 product(bool, DisableAttachMechanism, false, \ 2327 "Disable mechanism that allows tools to attach to this VM") \ 2328 \ 2329 product(bool, StartAttachListener, false, \ 2330 "Always start Attach Listener at VM startup") \ 2331 \ 2332 product(bool, EnableDynamicAgentLoading, true, \ 2333 "Allow tools to load agents with the attach mechanism") \ 2334 \ 2335 manageable(bool, PrintConcurrentLocks, false, \ 2336 "Print java.util.concurrent locks in thread dump") \ 2337 \ 2338 /* Shared spaces */ \ 2339 \ 2340 product(bool, UseSharedSpaces, true, \ 2341 "Use shared spaces for metadata") \ 2342 \ 2343 product(bool, VerifySharedSpaces, false, \ 2344 "Verify shared spaces (false for default archive, true for " \ 2345 "archive specified by -XX:SharedArchiveFile)") \ 2346 \ 2347 product(bool, RequireSharedSpaces, false, \ 2348 "Require shared spaces for metadata") \ 2349 \ 2350 product(bool, DumpSharedSpaces, false, \ 2351 "Special mode: JVM reads a class list, loads classes, builds " \ 2352 "shared spaces, and dumps the shared spaces to a file to be " \ 2353 "used in future JVM runs") \ 2354 \ 2355 product(bool, PrintSharedArchiveAndExit, false, \ 2356 "Print shared archive file contents") \ 2357 \ 2358 product(bool, PrintSharedDictionary, false, \ 2359 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2360 "dictionary") \ 2361 \ 2362 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2363 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2364 "Address to allocate shared memory region for class data") \ 2365 range(0, SIZE_MAX) \ 2366 \ 2367 product(ccstr, SharedArchiveConfigFile, NULL, \ 2368 "Data to add to the CDS archive file") \ 2369 \ 2370 product(uintx, SharedSymbolTableBucketSize, 4, \ 2371 "Average number of symbols per bucket in shared table") \ 2372 range(2, 246) \ 2373 \ 2374 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2375 "Allow Java agent to be run with CDS dumping") \ 2376 \ 2377 diagnostic(bool, PrintMethodHandleStubs, false, \ 2378 "Print generated stub code for method handles") \ 2379 \ 2380 develop(bool, TraceMethodHandles, false, \ 2381 "trace internal method handle operations") \ 2382 \ 2383 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2384 "perform extra checks when constructing method handles") \ 2385 \ 2386 diagnostic(bool, ShowHiddenFrames, false, \ 2387 "show method handle implementation frames (usually hidden)") \ 2388 \ 2389 experimental(bool, TrustFinalNonStaticFields, false, \ 2390 "trust final non-static declarations for constant folding") \ 2391 \ 2392 diagnostic(bool, FoldStableValues, true, \ 2393 "Optimize loads from stable fields (marked w/ @Stable)") \ 2394 \ 2395 develop(bool, TraceInvokeDynamic, false, \ 2396 "trace internal invoke dynamic operations") \ 2397 \ 2398 diagnostic(int, UseBootstrapCallInfo, 1, \ 2399 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2400 "resolved before the bootstrap method is called; 1: when a BSM " \ 2401 "that may accept a BootstrapCallInfo is detected, use that API " \ 2402 "to pass BSM arguments, which allows the BSM to delay their " \ 2403 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2404 "via that API, instead of with the eagerly-resolved array.") \ 2405 \ 2406 diagnostic(bool, PauseAtStartup, false, \ 2407 "Causes the VM to pause at startup time and wait for the pause " \ 2408 "file to be removed (default: ./vm.paused.<pid>)") \ 2409 \ 2410 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2411 "The file to create and for whose removal to await when pausing " \ 2412 "at startup. (default: ./vm.paused.<pid>)") \ 2413 \ 2414 diagnostic(bool, PauseAtExit, false, \ 2415 "Pause and wait for keypress on exit if a debugger is attached") \ 2416 \ 2417 product(bool, ExtendedDTraceProbes, false, \ 2418 "Enable performance-impacting dtrace probes") \ 2419 \ 2420 product(bool, DTraceMethodProbes, false, \ 2421 "Enable dtrace probes for method-entry and method-exit") \ 2422 \ 2423 product(bool, DTraceAllocProbes, false, \ 2424 "Enable dtrace probes for object allocation") \ 2425 \ 2426 product(bool, DTraceMonitorProbes, false, \ 2427 "Enable dtrace probes for monitor events") \ 2428 \ 2429 product(bool, RelaxAccessControlCheck, false, \ 2430 "Relax the access control checks in the verifier") \ 2431 \ 2432 product(uintx, StringTableSize, defaultStringTableSize, \ 2433 "Number of buckets in the interned String table " \ 2434 "(will be rounded to nearest higher power of 2)") \ 2435 range(minimumStringTableSize, 16777216ul) \ 2436 \ 2437 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2438 "Number of buckets in the JVM internal Symbol table") \ 2439 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 2440 \ 2441 product(bool, UseStringDeduplication, false, \ 2442 "Use string deduplication") \ 2443 \ 2444 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2445 "A string must reach this age (or be promoted to an old region) " \ 2446 "to be considered for deduplication") \ 2447 range(1, markOopDesc::max_age) \ 2448 \ 2449 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2450 "Force table resize every time the table is scanned") \ 2451 \ 2452 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2453 "Force table rehash every time the table is scanned") \ 2454 \ 2455 diagnostic(bool, WhiteBoxAPI, false, \ 2456 "Enable internal testing APIs") \ 2457 \ 2458 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2459 "Default survivor space alignment in bytes") \ 2460 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2461 \ 2462 product(ccstr, DumpLoadedClassList, NULL, \ 2463 "Dump the names all loaded classes, that could be stored into " \ 2464 "the CDS archive, in the specified file") \ 2465 \ 2466 product(ccstr, SharedClassListFile, NULL, \ 2467 "Override the default CDS class list") \ 2468 \ 2469 product(ccstr, SharedArchiveFile, NULL, \ 2470 "Override the default location of the CDS archive file") \ 2471 \ 2472 product(ccstr, ExtraSharedClassListFile, NULL, \ 2473 "Extra classlist for building the CDS archive file") \ 2474 \ 2475 experimental(size_t, ArrayAllocatorMallocLimit, \ 2476 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2477 "Allocation less than this value will be allocated " \ 2478 "using malloc. Larger allocations will use mmap.") \ 2479 \ 2480 experimental(bool, AlwaysAtomicAccesses, false, \ 2481 "Accesses to all variables should always be atomic") \ 2482 \ 2483 diagnostic(bool, UseUnalignedAccesses, false, \ 2484 "Use unaligned memory accesses in Unsafe") \ 2485 \ 2486 product_pd(bool, PreserveFramePointer, \ 2487 "Use the FP register for holding the frame pointer " \ 2488 "and not as a general purpose register.") \ 2489 \ 2490 diagnostic(bool, CheckIntrinsics, true, \ 2491 "When a class C is loaded, check that " \ 2492 "(1) all intrinsics defined by the VM for class C are present "\ 2493 "in the loaded class file and are marked with the " \ 2494 "@HotSpotIntrinsicCandidate annotation, that " \ 2495 "(2) there is an intrinsic registered for all loaded methods " \ 2496 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2497 "annotation, and that " \ 2498 "(3) no orphan methods exist for class C (i.e., methods for " \ 2499 "which the VM declares an intrinsic but that are not declared "\ 2500 "in the loaded class C. " \ 2501 "Check (3) is available only in debug builds.") \ 2502 \ 2503 diagnostic_pd(intx, InitArrayShortSize, \ 2504 "Threshold small size (in bytes) for clearing arrays. " \ 2505 "Anything this size or smaller may get converted to discrete " \ 2506 "scalar stores.") \ 2507 range(0, max_intx) \ 2508 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2509 \ 2510 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2511 "Disable backwards compatibility for compile commands.") \ 2512 \ 2513 diagnostic(bool, CompilerDirectivesPrint, false, \ 2514 "Print compiler directives on installation.") \ 2515 diagnostic(int, CompilerDirectivesLimit, 50, \ 2516 "Limit on number of compiler directives.") \ 2517 \ 2518 product(ccstr, AllocateHeapAt, NULL, \ 2519 "Path to the directoy where a temporary file will be created " \ 2520 "to use as the backing store for Java Heap.") \ 2521 \ 2522 experimental(ccstr, AllocateOldGenAt, NULL, \ 2523 "Path to the directoy where a temporary file will be " \ 2524 "created to use as the backing store for old generation." \ 2525 "File of size Xmx is pre-allocated for performance reason, so" \ 2526 "we need that much space available") \ 2527 \ 2528 develop(bool, VerifyMetaspace, false, \ 2529 "Verify metaspace on chunk movements.") \ 2530 \ 2531 diagnostic(bool, ShowRegistersOnAssert, true, \ 2532 "On internal errors, include registers in error report.") \ 2533 \ 2534 experimental(bool, UseSwitchProfiling, true, \ 2535 "leverage profiling for table/lookup switch") \ 2536 \ 2537 JFR_ONLY(product(bool, FlightRecorder, false, \ 2538 "Enable Flight Recorder")) \ 2539 \ 2540 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2541 "Flight Recorder options")) \ 2542 \ 2543 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2544 "Start flight recording with options")) \ 2545 \ 2546 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2547 "Use platform unstable time where supported for timestamps only") 2548 2549 #define VM_FLAGS(develop, \ 2550 develop_pd, \ 2551 product, \ 2552 product_pd, \ 2553 diagnostic, \ 2554 diagnostic_pd, \ 2555 experimental, \ 2556 notproduct, \ 2557 manageable, \ 2558 product_rw, \ 2559 lp64_product, \ 2560 range, \ 2561 constraint, \ 2562 writeable) \ 2563 \ 2564 RUNTIME_FLAGS( \ 2565 develop, \ 2566 develop_pd, \ 2567 product, \ 2568 product_pd, \ 2569 diagnostic, \ 2570 diagnostic_pd, \ 2571 experimental, \ 2572 notproduct, \ 2573 manageable, \ 2574 product_rw, \ 2575 lp64_product, \ 2576 range, \ 2577 constraint, \ 2578 writeable) \ 2579 \ 2580 GC_FLAGS( \ 2581 develop, \ 2582 develop_pd, \ 2583 product, \ 2584 product_pd, \ 2585 diagnostic, \ 2586 diagnostic_pd, \ 2587 experimental, \ 2588 notproduct, \ 2589 manageable, \ 2590 product_rw, \ 2591 lp64_product, \ 2592 range, \ 2593 constraint, \ 2594 writeable) \ 2595 2596 /* 2597 * Macros for factoring of globals 2598 */ 2599 2600 // Interface macros 2601 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2602 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2603 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2604 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2605 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2606 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2607 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2608 #ifdef PRODUCT 2609 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2610 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2611 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2612 #else 2613 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2614 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2615 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2616 #endif // PRODUCT 2617 // Special LP64 flags, product only needed for now. 2618 #ifdef _LP64 2619 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2620 #else 2621 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2622 #endif // _LP64 2623 2624 // Implementation macros 2625 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 2626 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 2627 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 2628 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 2629 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 2630 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 2631 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 2632 #ifdef PRODUCT 2633 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 2634 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 2635 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 2636 #else 2637 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 2638 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 2639 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 2640 #endif // PRODUCT 2641 #ifdef _LP64 2642 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 2643 #else 2644 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 2645 #endif // _LP64 2646 2647 // Only materialize src code for range checking when required, ignore otherwise 2648 #define IGNORE_RANGE(a, b) 2649 // Only materialize src code for contraint checking when required, ignore otherwise 2650 #define IGNORE_CONSTRAINT(func,type) 2651 2652 #define IGNORE_WRITEABLE(type) 2653 2654 VM_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2655 DECLARE_PD_DEVELOPER_FLAG, \ 2656 DECLARE_PRODUCT_FLAG, \ 2657 DECLARE_PD_PRODUCT_FLAG, \ 2658 DECLARE_DIAGNOSTIC_FLAG, \ 2659 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2660 DECLARE_EXPERIMENTAL_FLAG, \ 2661 DECLARE_NOTPRODUCT_FLAG, \ 2662 DECLARE_MANAGEABLE_FLAG, \ 2663 DECLARE_PRODUCT_RW_FLAG, \ 2664 DECLARE_LP64_PRODUCT_FLAG, \ 2665 IGNORE_RANGE, \ 2666 IGNORE_CONSTRAINT, \ 2667 IGNORE_WRITEABLE) 2668 2669 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2670 DECLARE_PD_DEVELOPER_FLAG, \ 2671 DECLARE_PRODUCT_FLAG, \ 2672 DECLARE_PD_PRODUCT_FLAG, \ 2673 DECLARE_DIAGNOSTIC_FLAG, \ 2674 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2675 DECLARE_NOTPRODUCT_FLAG, \ 2676 IGNORE_RANGE, \ 2677 IGNORE_CONSTRAINT, \ 2678 IGNORE_WRITEABLE) 2679 2680 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2681 DECLARE_PRODUCT_FLAG, \ 2682 DECLARE_DIAGNOSTIC_FLAG, \ 2683 DECLARE_EXPERIMENTAL_FLAG, \ 2684 DECLARE_NOTPRODUCT_FLAG, \ 2685 IGNORE_RANGE, \ 2686 IGNORE_CONSTRAINT, \ 2687 IGNORE_WRITEABLE) 2688 2689 // Extensions 2690 2691 #include "runtime/globals_ext.hpp" 2692 2693 #endif // SHARE_RUNTIME_GLOBALS_HPP