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(intx, UseSSE, 99, \ 328 "Highest supported SSE instructions set on x86/x64") \ 329 range(0, 99) \ 330 \ 331 product(bool, UseAES, false, \ 332 "Control whether AES instructions are used when available") \ 333 \ 334 product(bool, UseFMA, false, \ 335 "Control whether FMA instructions are used when available") \ 336 \ 337 product(bool, UseSHA, false, \ 338 "Control whether SHA instructions are used when available") \ 339 \ 340 diagnostic(bool, UseGHASHIntrinsics, false, \ 341 "Use intrinsics for GHASH versions of crypto") \ 342 \ 343 product(bool, UseBASE64Intrinsics, false, \ 344 "Use intrinsics for java.util.Base64") \ 345 \ 346 product(size_t, LargePageSizeInBytes, 0, \ 347 "Large page size (0 to let VM choose the page size)") \ 348 range(0, max_uintx) \ 349 \ 350 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 351 "Use large pages if maximum heap is at least this big") \ 352 range(0, max_uintx) \ 353 \ 354 product(bool, ForceTimeHighResolution, false, \ 355 "Using high time resolution (for Win32 only)") \ 356 \ 357 develop(bool, TracePcPatching, false, \ 358 "Trace usage of frame::patch_pc") \ 359 \ 360 develop(bool, TraceRelocator, false, \ 361 "Trace the bytecode relocator") \ 362 \ 363 develop(bool, TraceLongCompiles, false, \ 364 "Print out every time compilation is longer than " \ 365 "a given threshold") \ 366 \ 367 diagnostic(bool, SafepointALot, false, \ 368 "Generate a lot of safepoints. This works with " \ 369 "GuaranteedSafepointInterval") \ 370 \ 371 diagnostic(bool, HandshakeALot, false, \ 372 "Generate a lot of handshakes. This works with " \ 373 "GuaranteedSafepointInterval") \ 374 \ 375 product_pd(bool, BackgroundCompilation, \ 376 "A thread requesting compilation is not blocked during " \ 377 "compilation") \ 378 \ 379 product(bool, PrintVMQWaitTime, false, \ 380 "Print out the waiting time in VM operation queue") \ 381 \ 382 product(bool, MethodFlushing, true, \ 383 "Reclamation of zombie and not-entrant methods") \ 384 \ 385 develop(bool, VerifyStack, false, \ 386 "Verify stack of each thread when it is entering a runtime call") \ 387 \ 388 diagnostic(bool, ForceUnreachable, false, \ 389 "Make all non code cache addresses to be unreachable by " \ 390 "forcing use of 64bit literal fixups") \ 391 \ 392 notproduct(bool, StressDerivedPointers, false, \ 393 "Force scavenge when a derived pointer is detected on stack " \ 394 "after rtm call") \ 395 \ 396 develop(bool, TraceDerivedPointers, false, \ 397 "Trace traversal of derived pointers on stack") \ 398 \ 399 notproduct(bool, TraceCodeBlobStacks, false, \ 400 "Trace stack-walk of codeblobs") \ 401 \ 402 product(bool, PrintJNIResolving, false, \ 403 "Used to implement -v:jni") \ 404 \ 405 notproduct(bool, PrintRewrites, false, \ 406 "Print methods that are being rewritten") \ 407 \ 408 product(bool, UseInlineCaches, true, \ 409 "Use Inline Caches for virtual calls ") \ 410 \ 411 diagnostic(bool, InlineArrayCopy, true, \ 412 "Inline arraycopy native that is known to be part of " \ 413 "base library DLL") \ 414 \ 415 diagnostic(bool, InlineObjectHash, true, \ 416 "Inline Object::hashCode() native that is known to be part " \ 417 "of base library DLL") \ 418 \ 419 diagnostic(bool, InlineNatives, true, \ 420 "Inline natives that are known to be part of base library DLL") \ 421 \ 422 diagnostic(bool, InlineMathNatives, true, \ 423 "Inline SinD, CosD, etc.") \ 424 \ 425 diagnostic(bool, InlineClassNatives, true, \ 426 "Inline Class.isInstance, etc") \ 427 \ 428 diagnostic(bool, InlineThreadNatives, true, \ 429 "Inline Thread.currentThread, etc") \ 430 \ 431 diagnostic(bool, InlineUnsafeOps, true, \ 432 "Inline memory ops (native methods) from Unsafe") \ 433 \ 434 product(bool, CriticalJNINatives, true, \ 435 "Check for critical JNI entry points") \ 436 \ 437 notproduct(bool, StressCriticalJNINatives, false, \ 438 "Exercise register saving code in critical natives") \ 439 \ 440 diagnostic(bool, UseAESIntrinsics, false, \ 441 "Use intrinsics for AES versions of crypto") \ 442 \ 443 diagnostic(bool, UseAESCTRIntrinsics, false, \ 444 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 445 \ 446 diagnostic(bool, UseSHA1Intrinsics, false, \ 447 "Use intrinsics for SHA-1 crypto hash function. " \ 448 "Requires that UseSHA is enabled.") \ 449 \ 450 diagnostic(bool, UseSHA256Intrinsics, false, \ 451 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 452 "Requires that UseSHA is enabled.") \ 453 \ 454 diagnostic(bool, UseSHA512Intrinsics, false, \ 455 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 456 "Requires that UseSHA is enabled.") \ 457 \ 458 diagnostic(bool, UseCRC32Intrinsics, false, \ 459 "use intrinsics for java.util.zip.CRC32") \ 460 \ 461 diagnostic(bool, UseCRC32CIntrinsics, false, \ 462 "use intrinsics for java.util.zip.CRC32C") \ 463 \ 464 diagnostic(bool, UseAdler32Intrinsics, false, \ 465 "use intrinsics for java.util.zip.Adler32") \ 466 \ 467 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 468 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 469 \ 470 diagnostic(ccstrlist, DisableIntrinsic, "", \ 471 "do not expand intrinsics whose (internal) names appear here") \ 472 \ 473 develop(bool, TraceCallFixup, false, \ 474 "Trace all call fixups") \ 475 \ 476 develop(bool, DeoptimizeALot, false, \ 477 "Deoptimize at every exit from the runtime system") \ 478 \ 479 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 480 "A comma separated list of bcis to deoptimize at") \ 481 \ 482 product(bool, DeoptimizeRandom, false, \ 483 "Deoptimize random frames on random exit from the runtime system")\ 484 \ 485 notproduct(bool, ZombieALot, false, \ 486 "Create zombies (non-entrant) at exit from the runtime system") \ 487 \ 488 notproduct(bool, WalkStackALot, false, \ 489 "Trace stack (no print) at every exit from the runtime system") \ 490 \ 491 product(bool, Debugging, false, \ 492 "Set when executing debug methods in debug.cpp " \ 493 "(to prevent triggering assertions)") \ 494 \ 495 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 496 "Enable strict checks that safepoints cannot happen for threads " \ 497 "that use NoSafepointVerifier") \ 498 \ 499 notproduct(bool, VerifyLastFrame, false, \ 500 "Verify oops on last frame on entry to VM") \ 501 \ 502 product(bool, FailOverToOldVerifier, true, \ 503 "Fail over to old verifier when split verifier fails") \ 504 \ 505 product(bool, SafepointTimeout, false, \ 506 "Time out and warn or fail after SafepointTimeoutDelay " \ 507 "milliseconds if failed to reach safepoint") \ 508 \ 509 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 510 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 511 \ 512 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 513 "Abort upon failure to complete VM operation promptly") \ 514 \ 515 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 516 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 517 range(0, max_intx) \ 518 \ 519 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 520 /* typically, at most a few retries are needed */ \ 521 product(intx, SuspendRetryCount, 50, \ 522 "Maximum retry count for an external suspend request") \ 523 range(0, max_intx) \ 524 \ 525 product(intx, SuspendRetryDelay, 5, \ 526 "Milliseconds to delay per retry (* current_retry_count)") \ 527 range(0, max_intx) \ 528 \ 529 product(bool, AssertOnSuspendWaitFailure, false, \ 530 "Assert/Guarantee on external suspend wait failure") \ 531 \ 532 product(bool, TraceSuspendWaitFailures, false, \ 533 "Trace external suspend wait failures") \ 534 \ 535 product(bool, MaxFDLimit, true, \ 536 "Bump the number of file descriptors to maximum in Solaris") \ 537 \ 538 diagnostic(bool, LogEvents, true, \ 539 "Enable the various ring buffer event logs") \ 540 \ 541 diagnostic(uintx, LogEventsBufferEntries, 10, \ 542 "Number of ring buffer event logs") \ 543 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 544 \ 545 diagnostic(bool, BytecodeVerificationRemote, true, \ 546 "Enable the Java bytecode verifier for remote classes") \ 547 \ 548 diagnostic(bool, BytecodeVerificationLocal, false, \ 549 "Enable the Java bytecode verifier for local classes") \ 550 \ 551 develop(bool, ForceFloatExceptions, trueInDebug, \ 552 "Force exceptions on FP stack under/overflow") \ 553 \ 554 develop(bool, VerifyStackAtCalls, false, \ 555 "Verify that the stack pointer is unchanged after calls") \ 556 \ 557 develop(bool, TraceJavaAssertions, false, \ 558 "Trace java language assertions") \ 559 \ 560 notproduct(bool, VerifyCodeCache, false, \ 561 "Verify code cache on memory allocation/deallocation") \ 562 \ 563 develop(bool, UseMallocOnly, false, \ 564 "Use only malloc/free for allocation (no resource area/arena)") \ 565 \ 566 develop(bool, PrintMallocStatistics, false, \ 567 "Print malloc/free statistics") \ 568 \ 569 develop(bool, ZapResourceArea, trueInDebug, \ 570 "Zap freed resource/arena space with 0xABABABAB") \ 571 \ 572 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 573 "Zap freed VM handle space with 0xBCBCBCBC") \ 574 \ 575 notproduct(bool, ZapStackSegments, trueInDebug, \ 576 "Zap allocated/freed stack segments with 0xFADFADED") \ 577 \ 578 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 579 "Zap unused heap space with 0xBAADBABE") \ 580 \ 581 develop(bool, CheckZapUnusedHeapArea, false, \ 582 "Check zapping of unused heap space") \ 583 \ 584 develop(bool, ZapFillerObjects, trueInDebug, \ 585 "Zap filler objects with 0xDEAFBABE") \ 586 \ 587 develop(bool, PrintVMMessages, true, \ 588 "Print VM messages on console") \ 589 \ 590 notproduct(uintx, ErrorHandlerTest, 0, \ 591 "If > 0, provokes an error after VM initialization; the value " \ 592 "determines which error to provoke. See test_error_handler() " \ 593 "in vmError.cpp.") \ 594 \ 595 notproduct(uintx, TestCrashInErrorHandler, 0, \ 596 "If > 0, provokes an error inside VM error handler (a secondary " \ 597 "crash). see test_error_handler() in vmError.cpp") \ 598 \ 599 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 600 "If true, tests SafeFetch inside error handler.") \ 601 \ 602 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 603 "If true, simulates an unresponsive error handler.") \ 604 \ 605 develop(bool, Verbose, false, \ 606 "Print additional debugging information from other modes") \ 607 \ 608 develop(bool, PrintMiscellaneous, false, \ 609 "Print uncategorized debugging information (requires +Verbose)") \ 610 \ 611 develop(bool, WizardMode, false, \ 612 "Print much more debugging information") \ 613 \ 614 product(bool, ShowMessageBoxOnError, false, \ 615 "Keep process alive on VM fatal error") \ 616 \ 617 product(bool, CreateCoredumpOnCrash, true, \ 618 "Create core/mini dump on VM fatal error") \ 619 \ 620 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 621 "Timeout, in seconds, to limit the time spent on writing an " \ 622 "error log in case of a crash.") \ 623 range(0, (uint64_t)max_jlong/1000) \ 624 \ 625 product_pd(bool, UseOSErrorReporting, \ 626 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 627 \ 628 product(bool, SuppressFatalErrorMessage, false, \ 629 "Report NO fatal error message (avoid deadlock)") \ 630 \ 631 product(ccstrlist, OnError, "", \ 632 "Run user-defined commands on fatal error; see VMError.cpp " \ 633 "for examples") \ 634 \ 635 product(ccstrlist, OnOutOfMemoryError, "", \ 636 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 637 \ 638 manageable(bool, HeapDumpBeforeFullGC, false, \ 639 "Dump heap to file before any major stop-the-world GC") \ 640 \ 641 manageable(bool, HeapDumpAfterFullGC, false, \ 642 "Dump heap to file after any major stop-the-world GC") \ 643 \ 644 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 645 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 646 \ 647 manageable(ccstr, HeapDumpPath, NULL, \ 648 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 649 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 650 "in the working directory)") \ 651 \ 652 develop(bool, BreakAtWarning, false, \ 653 "Execute breakpoint upon encountering VM warning") \ 654 \ 655 product(ccstr, NativeMemoryTracking, "off", \ 656 "Native memory tracking options") \ 657 \ 658 diagnostic(bool, PrintNMTStatistics, false, \ 659 "Print native memory tracking summary data if it is on") \ 660 \ 661 diagnostic(bool, LogCompilation, false, \ 662 "Log compilation activity in detail to LogFile") \ 663 \ 664 product(bool, PrintCompilation, false, \ 665 "Print compilations") \ 666 \ 667 product(bool, PrintExtendedThreadInfo, false, \ 668 "Print more information in thread dump") \ 669 \ 670 diagnostic(bool, TraceNMethodInstalls, false, \ 671 "Trace nmethod installation") \ 672 \ 673 diagnostic(intx, ScavengeRootsInCode, 2, \ 674 "0: do not allow scavengable oops in the code cache; " \ 675 "1: allow scavenging from the code cache; " \ 676 "2: emit as many constants as the compiler can see") \ 677 range(0, 2) \ 678 \ 679 product(bool, AlwaysRestoreFPU, false, \ 680 "Restore the FPU control word after every JNI call (expensive)") \ 681 \ 682 diagnostic(bool, PrintCompilation2, false, \ 683 "Print additional statistics per compilation") \ 684 \ 685 diagnostic(bool, PrintAdapterHandlers, false, \ 686 "Print code generated for i2c/c2i adapters") \ 687 \ 688 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 689 "Verify that i2c/c2i adapters are called properly") \ 690 \ 691 develop(bool, VerifyAdapterSharing, false, \ 692 "Verify that the code for shared adapters is the equivalent") \ 693 \ 694 diagnostic(bool, PrintAssembly, false, \ 695 "Print assembly code (using external disassembler.so)") \ 696 \ 697 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 698 "Print options string passed to disassembler.so") \ 699 \ 700 notproduct(bool, PrintNMethodStatistics, false, \ 701 "Print a summary statistic for the generated nmethods") \ 702 \ 703 diagnostic(bool, PrintNMethods, false, \ 704 "Print assembly code for nmethods when generated") \ 705 \ 706 diagnostic(bool, PrintNativeNMethods, false, \ 707 "Print assembly code for native nmethods when generated") \ 708 \ 709 develop(bool, PrintDebugInfo, false, \ 710 "Print debug information for all nmethods when generated") \ 711 \ 712 develop(bool, PrintRelocations, false, \ 713 "Print relocation information for all nmethods when generated") \ 714 \ 715 develop(bool, PrintDependencies, false, \ 716 "Print dependency information for all nmethods when generated") \ 717 \ 718 develop(bool, PrintExceptionHandlers, false, \ 719 "Print exception handler tables for all nmethods when generated") \ 720 \ 721 develop(bool, StressCompiledExceptionHandlers, false, \ 722 "Exercise compiled exception handlers") \ 723 \ 724 develop(bool, InterceptOSException, false, \ 725 "Start debugger when an implicit OS (e.g. NULL) " \ 726 "exception happens") \ 727 \ 728 product(bool, PrintCodeCache, false, \ 729 "Print the code cache memory usage when exiting") \ 730 \ 731 develop(bool, PrintCodeCache2, false, \ 732 "Print detailed usage information on the code cache when exiting")\ 733 \ 734 product(bool, PrintCodeCacheOnCompilation, false, \ 735 "Print the code cache memory usage each time a method is " \ 736 "compiled") \ 737 \ 738 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 739 "Print code heap usage statistics on exit and on full condition") \ 740 \ 741 diagnostic(bool, PrintStubCode, false, \ 742 "Print generated stub code") \ 743 \ 744 product(bool, StackTraceInThrowable, true, \ 745 "Collect backtrace in throwable when exception happens") \ 746 \ 747 product(bool, OmitStackTraceInFastThrow, true, \ 748 "Omit backtraces for some 'hot' exceptions in optimized code") \ 749 \ 750 product(bool, PrintWarnings, true, \ 751 "Print JVM warnings to output stream") \ 752 \ 753 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 754 "Print warnings for stalled SpinLocks") \ 755 \ 756 product(bool, RegisterFinalizersAtInit, true, \ 757 "Register finalizable objects at end of Object.<init> or " \ 758 "after allocation") \ 759 \ 760 develop(bool, RegisterReferences, true, \ 761 "Tell whether the VM should register soft/weak/final/phantom " \ 762 "references") \ 763 \ 764 develop(bool, IgnoreRewrites, false, \ 765 "Suppress rewrites of bytecodes in the oopmap generator. " \ 766 "This is unsafe!") \ 767 \ 768 develop(bool, PrintCodeCacheExtension, false, \ 769 "Print extension of code cache") \ 770 \ 771 develop(bool, UsePrivilegedStack, true, \ 772 "Enable the security JVM functions") \ 773 \ 774 develop(bool, ProtectionDomainVerification, true, \ 775 "Verify protection domain before resolution in system dictionary")\ 776 \ 777 product(bool, ClassUnloading, true, \ 778 "Do unloading of classes") \ 779 \ 780 product(bool, ClassUnloadingWithConcurrentMark, true, \ 781 "Do unloading of classes with a concurrent marking cycle") \ 782 \ 783 develop(bool, DisableStartThread, false, \ 784 "Disable starting of additional Java threads " \ 785 "(for debugging only)") \ 786 \ 787 develop(bool, MemProfiling, false, \ 788 "Write memory usage profiling to log file") \ 789 \ 790 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 791 "Print the system dictionary at exit") \ 792 \ 793 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 794 "Dynamically resize system dictionaries as needed") \ 795 \ 796 product(bool, AlwaysLockClassLoader, false, \ 797 "Require the VM to acquire the class loader lock before calling " \ 798 "loadClass() even for class loaders registering " \ 799 "as parallel capable") \ 800 \ 801 product(bool, AllowParallelDefineClass, false, \ 802 "Allow parallel defineClass requests for class loaders " \ 803 "registering as parallel capable") \ 804 \ 805 product_pd(bool, DontYieldALot, \ 806 "Throw away obvious excess yield calls") \ 807 \ 808 develop(bool, UseDetachedThreads, true, \ 809 "Use detached threads that are recycled upon termination " \ 810 "(for Solaris only)") \ 811 \ 812 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 813 "Disable the use of stack guard pages if the JVM is loaded " \ 814 "on the primordial process thread") \ 815 \ 816 product(bool, UseLWPSynchronization, true, \ 817 "Use LWP-based instead of libthread-based synchronization " \ 818 "(SPARC only)") \ 819 \ 820 product(intx, MonitorBound, 0, "Bound Monitor population") \ 821 range(0, max_jint) \ 822 \ 823 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 824 "Percentage of used monitors before triggering cleanup " \ 825 "safepoint which deflates monitors (0 is off). " \ 826 "The check is performed on GuaranteedSafepointInterval.") \ 827 range(0, 100) \ 828 \ 829 experimental(intx, hashCode, 5, \ 830 "(Unstable) select hashCode generation algorithm") \ 831 \ 832 product(bool, FilterSpuriousWakeups, true, \ 833 "When true prevents OS-level spurious, or premature, wakeups " \ 834 "from Object.wait (Ignored for Windows)") \ 835 \ 836 develop(bool, UsePthreads, false, \ 837 "Use pthread-based instead of libthread-based synchronization " \ 838 "(SPARC only)") \ 839 \ 840 product(bool, ReduceSignalUsage, false, \ 841 "Reduce the use of OS signals in Java and/or the VM") \ 842 \ 843 develop_pd(bool, ShareVtableStubs, \ 844 "Share vtable stubs (smaller code but worse branch prediction") \ 845 \ 846 develop(bool, LoadLineNumberTables, true, \ 847 "Tell whether the class file parser loads line number tables") \ 848 \ 849 develop(bool, LoadLocalVariableTables, true, \ 850 "Tell whether the class file parser loads local variable tables") \ 851 \ 852 develop(bool, LoadLocalVariableTypeTables, true, \ 853 "Tell whether the class file parser loads local variable type" \ 854 "tables") \ 855 \ 856 product(bool, AllowUserSignalHandlers, false, \ 857 "Do not complain if the application installs signal handlers " \ 858 "(Solaris & Linux only)") \ 859 \ 860 product(bool, UseSignalChaining, true, \ 861 "Use signal-chaining to invoke signal handlers installed " \ 862 "by the application (Solaris & Linux only)") \ 863 \ 864 product(bool, AllowJNIEnvProxy, false, \ 865 "(Deprecated) Allow JNIEnv proxies for jdbx") \ 866 \ 867 product(bool, RestoreMXCSROnJNICalls, false, \ 868 "Restore MXCSR when returning from JNI calls") \ 869 \ 870 product(bool, CheckJNICalls, false, \ 871 "Verify all arguments to JNI calls") \ 872 \ 873 product(bool, UseFastJNIAccessors, true, \ 874 "Use optimized versions of Get<Primitive>Field") \ 875 \ 876 product(intx, MaxJNILocalCapacity, 65536, \ 877 "Maximum allowable local JNI handle capacity to " \ 878 "EnsureLocalCapacity() and PushLocalFrame(), " \ 879 "where <= 0 is unlimited, default: 65536") \ 880 range(min_intx, max_intx) \ 881 \ 882 product(bool, EagerXrunInit, false, \ 883 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 884 "but not all -Xrun libraries may support the state of the VM " \ 885 "at this time") \ 886 \ 887 product(bool, PreserveAllAnnotations, false, \ 888 "Preserve RuntimeInvisibleAnnotations as well " \ 889 "as RuntimeVisibleAnnotations") \ 890 \ 891 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 892 "Number of OutOfMemoryErrors preallocated with backtrace") \ 893 \ 894 product(bool, UseXMMForArrayCopy, false, \ 895 "Use SSE2 MOVQ instruction for Arraycopy") \ 896 \ 897 product(intx, FieldsAllocationStyle, 1, \ 898 "0 - type based with oops first, " \ 899 "1 - with oops last, " \ 900 "2 - oops in super and sub classes are together") \ 901 range(0, 2) \ 902 \ 903 product(bool, CompactFields, true, \ 904 "Allocate nonstatic fields in gaps between previous fields") \ 905 \ 906 notproduct(bool, PrintFieldLayout, false, \ 907 "Print field layout for each class") \ 908 \ 909 /* Need to limit the extent of the padding to reasonable size. */\ 910 /* 8K is well beyond the reasonable HW cache line size, even with */\ 911 /* aggressive prefetching, while still leaving the room for segregating */\ 912 /* among the distinct pages. */\ 913 product(intx, ContendedPaddingWidth, 128, \ 914 "How many bytes to pad the fields/classes marked @Contended with")\ 915 range(0, 8192) \ 916 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 917 \ 918 product(bool, EnableContended, true, \ 919 "Enable @Contended annotation support") \ 920 \ 921 product(bool, RestrictContended, true, \ 922 "Restrict @Contended to trusted classes") \ 923 \ 924 product(bool, UseBiasedLocking, true, \ 925 "Enable biased locking in JVM") \ 926 \ 927 product(intx, BiasedLockingStartupDelay, 0, \ 928 "Number of milliseconds to wait before enabling biased locking") \ 929 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 930 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 931 \ 932 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 933 "Print statistics of biased locking in JVM") \ 934 \ 935 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 936 "Threshold of number of revocations per type to try to " \ 937 "rebias all objects in the heap of that type") \ 938 range(0, max_intx) \ 939 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 940 \ 941 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 942 "Threshold of number of revocations per type to permanently " \ 943 "revoke biases of all objects in the heap of that type") \ 944 range(0, max_intx) \ 945 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 946 \ 947 product(intx, BiasedLockingDecayTime, 25000, \ 948 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 949 "type after previous bulk rebias") \ 950 range(500, max_intx) \ 951 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 952 \ 953 product(bool, ExitOnOutOfMemoryError, false, \ 954 "JVM exits on the first occurrence of an out-of-memory error") \ 955 \ 956 product(bool, CrashOnOutOfMemoryError, false, \ 957 "JVM aborts, producing an error log and core/mini dump, on the " \ 958 "first occurrence of an out-of-memory error") \ 959 \ 960 /* tracing */ \ 961 \ 962 develop(bool, StressRewriter, false, \ 963 "Stress linktime bytecode rewriting") \ 964 \ 965 product(ccstr, TraceJVMTI, NULL, \ 966 "Trace flags for JVMTI functions and events") \ 967 \ 968 /* This option can change an EMCP method into an obsolete method. */ \ 969 /* This can affect tests that except specific methods to be EMCP. */ \ 970 /* This option should be used with caution. */ \ 971 product(bool, StressLdcRewrite, false, \ 972 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 973 \ 974 /* change to false by default sometime after Mustang */ \ 975 product(bool, VerifyMergedCPBytecodes, true, \ 976 "Verify bytecodes after RedefineClasses constant pool merging") \ 977 \ 978 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 979 "Allow redefinition to add and delete private static or " \ 980 "final methods for compatibility with old releases") \ 981 \ 982 develop(bool, TraceBytecodes, false, \ 983 "Trace bytecode execution") \ 984 \ 985 develop(bool, TraceICs, false, \ 986 "Trace inline cache changes") \ 987 \ 988 notproduct(bool, TraceInvocationCounterOverflow, false, \ 989 "Trace method invocation counter overflow") \ 990 \ 991 develop(bool, TraceInlineCacheClearing, false, \ 992 "Trace clearing of inline caches in nmethods") \ 993 \ 994 develop(bool, TraceDependencies, false, \ 995 "Trace dependencies") \ 996 \ 997 develop(bool, VerifyDependencies, trueInDebug, \ 998 "Exercise and verify the compilation dependency mechanism") \ 999 \ 1000 develop(bool, TraceNewOopMapGeneration, false, \ 1001 "Trace OopMapGeneration") \ 1002 \ 1003 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1004 "Trace OopMapGeneration: print detailed cell states") \ 1005 \ 1006 develop(bool, TimeOopMap, false, \ 1007 "Time calls to GenerateOopMap::compute_map() in sum") \ 1008 \ 1009 develop(bool, TimeOopMap2, false, \ 1010 "Time calls to GenerateOopMap::compute_map() individually") \ 1011 \ 1012 develop(bool, TraceOopMapRewrites, false, \ 1013 "Trace rewriting of method oops during oop map generation") \ 1014 \ 1015 develop(bool, TraceICBuffer, false, \ 1016 "Trace usage of IC buffer") \ 1017 \ 1018 develop(bool, TraceCompiledIC, false, \ 1019 "Trace changes of compiled IC") \ 1020 \ 1021 develop(bool, FLSVerifyDictionary, false, \ 1022 "Do lots of (expensive) FLS dictionary verification") \ 1023 \ 1024 \ 1025 notproduct(bool, CheckMemoryInitialization, false, \ 1026 "Check memory initialization") \ 1027 \ 1028 product(uintx, ProcessDistributionStride, 4, \ 1029 "Stride through processors when distributing processes") \ 1030 range(0, max_juint) \ 1031 \ 1032 develop(bool, TraceFinalizerRegistration, false, \ 1033 "Trace registration of final references") \ 1034 \ 1035 product(bool, IgnoreEmptyClassPaths, false, \ 1036 "Ignore empty path elements in -classpath") \ 1037 \ 1038 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 1039 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 1040 "Initial size of the boot class loader data metaspace") \ 1041 range(30*K, max_uintx/BytesPerWord) \ 1042 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 1043 \ 1044 product(bool, PrintHeapAtSIGBREAK, true, \ 1045 "Print heap layout in response to SIGBREAK") \ 1046 \ 1047 manageable(bool, PrintClassHistogram, false, \ 1048 "Print a histogram of class instances") \ 1049 \ 1050 experimental(double, ObjectCountCutOffPercent, 0.5, \ 1051 "The percentage of the used heap that the instances of a class " \ 1052 "must occupy for the class to generate a trace event") \ 1053 range(0.0, 100.0) \ 1054 \ 1055 /* JVMTI heap profiling */ \ 1056 \ 1057 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 1058 "Trace JVMTI object tagging calls") \ 1059 \ 1060 diagnostic(bool, VerifyBeforeIteration, false, \ 1061 "Verify memory system before JVMTI iteration") \ 1062 \ 1063 /* compiler interface */ \ 1064 \ 1065 develop(bool, CIPrintCompilerName, false, \ 1066 "when CIPrint is active, print the name of the active compiler") \ 1067 \ 1068 diagnostic(bool, CIPrintCompileQueue, false, \ 1069 "display the contents of the compile queue whenever a " \ 1070 "compilation is enqueued") \ 1071 \ 1072 develop(bool, CIPrintRequests, false, \ 1073 "display every request for compilation") \ 1074 \ 1075 product(bool, CITime, false, \ 1076 "collect timing information for compilation") \ 1077 \ 1078 develop(bool, CITimeVerbose, false, \ 1079 "be more verbose in compilation timings") \ 1080 \ 1081 develop(bool, CITimeEach, false, \ 1082 "display timing information after each successful compilation") \ 1083 \ 1084 develop(bool, CICountOSR, false, \ 1085 "use a separate counter when assigning ids to osr compilations") \ 1086 \ 1087 develop(bool, CICompileNatives, true, \ 1088 "compile native methods if supported by the compiler") \ 1089 \ 1090 develop_pd(bool, CICompileOSR, \ 1091 "compile on stack replacement methods if supported by the " \ 1092 "compiler") \ 1093 \ 1094 develop(bool, CIPrintMethodCodes, false, \ 1095 "print method bytecodes of the compiled code") \ 1096 \ 1097 develop(bool, CIPrintTypeFlow, false, \ 1098 "print the results of ciTypeFlow analysis") \ 1099 \ 1100 develop(bool, CITraceTypeFlow, false, \ 1101 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 1102 \ 1103 develop(intx, OSROnlyBCI, -1, \ 1104 "OSR only at this bci. Negative values mean exclude that bci") \ 1105 \ 1106 /* compiler */ \ 1107 \ 1108 /* notice: the max range value here is max_jint, not max_intx */ \ 1109 /* because of overflow issue */ \ 1110 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 1111 "Number of compiler threads to run") \ 1112 range(0, max_jint) \ 1113 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 1114 \ 1115 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 1116 "Dynamically choose the number of parallel compiler threads") \ 1117 \ 1118 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 1119 "Reduce the number of parallel compiler threads when they " \ 1120 "are not used") \ 1121 \ 1122 diagnostic(bool, TraceCompilerThreads, false, \ 1123 "Trace creation and removal of compiler threads") \ 1124 \ 1125 develop(bool, InjectCompilerCreationFailure, false, \ 1126 "Inject thread creation failures for " \ 1127 "UseDynamicNumberOfCompilerThreads") \ 1128 \ 1129 product(intx, CompilationPolicyChoice, 0, \ 1130 "which compilation policy (0-2)") \ 1131 range(0, 2) \ 1132 \ 1133 develop(bool, UseStackBanging, true, \ 1134 "use stack banging for stack overflow checks (required for " \ 1135 "proper StackOverflow handling; disable only to measure cost " \ 1136 "of stackbanging)") \ 1137 \ 1138 develop(bool, UseStrictFP, true, \ 1139 "use strict fp if modifier strictfp is set") \ 1140 \ 1141 develop(bool, GenerateSynchronizationCode, true, \ 1142 "generate locking/unlocking code for synchronized methods and " \ 1143 "monitors") \ 1144 \ 1145 develop(bool, GenerateRangeChecks, true, \ 1146 "Generate range checks for array accesses") \ 1147 \ 1148 diagnostic_pd(bool, ImplicitNullChecks, \ 1149 "Generate code for implicit null checks") \ 1150 \ 1151 product_pd(bool, TrapBasedNullChecks, \ 1152 "Generate code for null checks that uses a cmp and trap " \ 1153 "instruction raising SIGTRAP. This is only used if an access to" \ 1154 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1155 "ImplicitNullChecks don't work (PPC64).") \ 1156 \ 1157 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1158 "Enable Thread SMR extra validity checks") \ 1159 \ 1160 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1161 "Enable Thread SMR Statistics") \ 1162 \ 1163 product(bool, Inline, true, \ 1164 "Enable inlining") \ 1165 \ 1166 product(bool, ClipInlining, true, \ 1167 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1168 \ 1169 develop(bool, UseCHA, true, \ 1170 "Enable CHA") \ 1171 \ 1172 product(bool, UseTypeProfile, true, \ 1173 "Check interpreter profile for historically monomorphic calls") \ 1174 \ 1175 diagnostic(bool, PrintInlining, false, \ 1176 "Print inlining optimizations") \ 1177 \ 1178 product(bool, UsePopCountInstruction, false, \ 1179 "Use population count instruction") \ 1180 \ 1181 develop(bool, EagerInitialization, false, \ 1182 "Eagerly initialize classes if possible") \ 1183 \ 1184 diagnostic(bool, LogTouchedMethods, false, \ 1185 "Log methods which have been ever touched in runtime") \ 1186 \ 1187 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1188 "Print all methods that have been ever touched in runtime") \ 1189 \ 1190 develop(bool, TraceMethodReplacement, false, \ 1191 "Print when methods are replaced do to recompilation") \ 1192 \ 1193 develop(bool, PrintMethodFlushing, false, \ 1194 "Print the nmethods being flushed") \ 1195 \ 1196 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1197 "print statistics about method flushing") \ 1198 \ 1199 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1200 "Number of compiled code invocations after which " \ 1201 "the method is considered as hot by the flusher") \ 1202 range(1, max_jint) \ 1203 \ 1204 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1205 "Minimum number of sweeper passes before an nmethod " \ 1206 "can be flushed") \ 1207 range(0, max_intx) \ 1208 \ 1209 product(bool, UseCodeAging, true, \ 1210 "Insert counter to detect warm methods") \ 1211 \ 1212 diagnostic(bool, StressCodeAging, false, \ 1213 "Start with counters compiled in") \ 1214 \ 1215 develop(bool, StressCodeBuffers, false, \ 1216 "Exercise code buffer expansion and other rare state changes") \ 1217 \ 1218 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1219 "Generate extra debugging information for non-safepoints in " \ 1220 "nmethods") \ 1221 \ 1222 product(bool, PrintVMOptions, false, \ 1223 "Print flags that appeared on the command line") \ 1224 \ 1225 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1226 "Ignore unrecognized VM options") \ 1227 \ 1228 product(bool, PrintCommandLineFlags, false, \ 1229 "Print flags specified on command line or set by ergonomics") \ 1230 \ 1231 product(bool, PrintFlagsInitial, false, \ 1232 "Print all VM flags before argument processing and exit VM") \ 1233 \ 1234 product(bool, PrintFlagsFinal, false, \ 1235 "Print all VM flags after argument and ergonomic processing") \ 1236 \ 1237 notproduct(bool, PrintFlagsWithComments, false, \ 1238 "Print all VM flags with default values and descriptions and " \ 1239 "exit") \ 1240 \ 1241 product(bool, PrintFlagsRanges, false, \ 1242 "Print VM flags and their ranges") \ 1243 \ 1244 diagnostic(bool, SerializeVMOutput, true, \ 1245 "Use a mutex to serialize output to tty and LogFile") \ 1246 \ 1247 diagnostic(bool, DisplayVMOutput, true, \ 1248 "Display all VM output on the tty, independently of LogVMOutput") \ 1249 \ 1250 diagnostic(bool, LogVMOutput, false, \ 1251 "Save VM output to LogFile") \ 1252 \ 1253 diagnostic(ccstr, LogFile, NULL, \ 1254 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1255 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1256 \ 1257 product(ccstr, ErrorFile, NULL, \ 1258 "If an error occurs, save the error data to this file " \ 1259 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1260 \ 1261 product(bool, ExtensiveErrorReports, \ 1262 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1263 "Error reports are more extensive.") \ 1264 \ 1265 product(bool, DisplayVMOutputToStderr, false, \ 1266 "If DisplayVMOutput is true, display all VM output to stderr") \ 1267 \ 1268 product(bool, DisplayVMOutputToStdout, false, \ 1269 "If DisplayVMOutput is true, display all VM output to stdout") \ 1270 \ 1271 product(bool, ErrorFileToStderr, false, \ 1272 "If true, error data is printed to stderr instead of a file") \ 1273 \ 1274 product(bool, ErrorFileToStdout, false, \ 1275 "If true, error data is printed to stdout instead of a file") \ 1276 \ 1277 product(bool, UseHeavyMonitors, false, \ 1278 "use heavyweight instead of lightweight Java monitors") \ 1279 \ 1280 product(bool, PrintStringTableStatistics, false, \ 1281 "print statistics about the StringTable and SymbolTable") \ 1282 \ 1283 diagnostic(bool, VerifyStringTableAtExit, false, \ 1284 "verify StringTable contents at exit") \ 1285 \ 1286 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1287 "print histogram of the symbol table") \ 1288 \ 1289 notproduct(bool, ExitVMOnVerifyError, false, \ 1290 "standard exit from VM if bytecode verify error " \ 1291 "(only in debug mode)") \ 1292 \ 1293 diagnostic(ccstr, AbortVMOnException, NULL, \ 1294 "Call fatal if this exception is thrown. Example: " \ 1295 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1296 \ 1297 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1298 "Call fatal if the exception pointed by AbortVMOnException " \ 1299 "has this message") \ 1300 \ 1301 develop(bool, DebugVtables, false, \ 1302 "add debugging code to vtable dispatch") \ 1303 \ 1304 notproduct(bool, PrintVtableStats, false, \ 1305 "print vtables stats at end of run") \ 1306 \ 1307 develop(bool, TraceCreateZombies, false, \ 1308 "trace creation of zombie nmethods") \ 1309 \ 1310 notproduct(bool, IgnoreLockingAssertions, false, \ 1311 "disable locking assertions (for speed)") \ 1312 \ 1313 product(bool, RangeCheckElimination, true, \ 1314 "Eliminate range checks") \ 1315 \ 1316 develop_pd(bool, UncommonNullCast, \ 1317 "track occurrences of null in casts; adjust compiler tactics") \ 1318 \ 1319 develop(bool, TypeProfileCasts, true, \ 1320 "treat casts like calls for purposes of type profiling") \ 1321 \ 1322 develop(bool, TraceLivenessGen, false, \ 1323 "Trace the generation of liveness analysis information") \ 1324 \ 1325 notproduct(bool, TraceLivenessQuery, false, \ 1326 "Trace queries of liveness analysis information") \ 1327 \ 1328 notproduct(bool, CollectIndexSetStatistics, false, \ 1329 "Collect information about IndexSets") \ 1330 \ 1331 develop(bool, UseLoopSafepoints, true, \ 1332 "Generate Safepoint nodes in every loop") \ 1333 \ 1334 develop(intx, FastAllocateSizeLimit, 128*K, \ 1335 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1336 "Inline allocations larger than this in doublewords must go slow")\ 1337 \ 1338 product_pd(bool, CompactStrings, \ 1339 "Enable Strings to use single byte chars in backing store") \ 1340 \ 1341 product_pd(uintx, TypeProfileLevel, \ 1342 "=XYZ, with Z: Type profiling of arguments at call; " \ 1343 "Y: Type profiling of return value at call; " \ 1344 "X: Type profiling of parameters to methods; " \ 1345 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1346 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1347 \ 1348 product(intx, TypeProfileArgsLimit, 2, \ 1349 "max number of call arguments to consider for type profiling") \ 1350 range(0, 16) \ 1351 \ 1352 product(intx, TypeProfileParmsLimit, 2, \ 1353 "max number of incoming parameters to consider for type profiling"\ 1354 ", -1 for all") \ 1355 range(-1, 64) \ 1356 \ 1357 /* statistics */ \ 1358 develop(bool, CountCompiledCalls, false, \ 1359 "Count method invocations") \ 1360 \ 1361 notproduct(bool, CountRuntimeCalls, false, \ 1362 "Count VM runtime calls") \ 1363 \ 1364 develop(bool, CountJNICalls, false, \ 1365 "Count jni method invocations") \ 1366 \ 1367 notproduct(bool, CountJVMCalls, false, \ 1368 "Count jvm method invocations") \ 1369 \ 1370 notproduct(bool, CountRemovableExceptions, false, \ 1371 "Count exceptions that could be replaced by branches due to " \ 1372 "inlining") \ 1373 \ 1374 notproduct(bool, ICMissHistogram, false, \ 1375 "Produce histogram of IC misses") \ 1376 \ 1377 /* interpreter */ \ 1378 product_pd(bool, RewriteBytecodes, \ 1379 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1380 \ 1381 product_pd(bool, RewriteFrequentPairs, \ 1382 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1383 \ 1384 diagnostic(bool, PrintInterpreter, false, \ 1385 "Print the generated interpreter code") \ 1386 \ 1387 product(bool, UseInterpreter, true, \ 1388 "Use interpreter for non-compiled methods") \ 1389 \ 1390 develop(bool, UseFastSignatureHandlers, true, \ 1391 "Use fast signature handlers for native calls") \ 1392 \ 1393 product(bool, UseLoopCounter, true, \ 1394 "Increment invocation counter on backward branch") \ 1395 \ 1396 product_pd(bool, UseOnStackReplacement, \ 1397 "Use on stack replacement, calls runtime if invoc. counter " \ 1398 "overflows in loop") \ 1399 \ 1400 notproduct(bool, TraceOnStackReplacement, false, \ 1401 "Trace on stack replacement") \ 1402 \ 1403 product_pd(bool, PreferInterpreterNativeStubs, \ 1404 "Use always interpreter stubs for native methods invoked via " \ 1405 "interpreter") \ 1406 \ 1407 develop(bool, CountBytecodes, false, \ 1408 "Count number of bytecodes executed") \ 1409 \ 1410 develop(bool, PrintBytecodeHistogram, false, \ 1411 "Print histogram of the executed bytecodes") \ 1412 \ 1413 develop(bool, PrintBytecodePairHistogram, false, \ 1414 "Print histogram of the executed bytecode pairs") \ 1415 \ 1416 diagnostic(bool, PrintSignatureHandlers, false, \ 1417 "Print code generated for native method signature handlers") \ 1418 \ 1419 develop(bool, VerifyOops, false, \ 1420 "Do plausibility checks for oops") \ 1421 \ 1422 develop(bool, CheckUnhandledOops, false, \ 1423 "Check for unhandled oops in VM code") \ 1424 \ 1425 develop(bool, VerifyJNIFields, trueInDebug, \ 1426 "Verify jfieldIDs for instance fields") \ 1427 \ 1428 notproduct(bool, VerifyJNIEnvThread, false, \ 1429 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1430 "from JNI") \ 1431 \ 1432 develop(bool, VerifyFPU, false, \ 1433 "Verify FPU state (check for NaN's, etc.)") \ 1434 \ 1435 develop(bool, VerifyThread, false, \ 1436 "Watch the thread register for corruption (SPARC only)") \ 1437 \ 1438 develop(bool, VerifyActivationFrameSize, false, \ 1439 "Verify that activation frame didn't become smaller than its " \ 1440 "minimal size") \ 1441 \ 1442 develop(bool, TraceFrequencyInlining, false, \ 1443 "Trace frequency based inlining") \ 1444 \ 1445 develop_pd(bool, InlineIntrinsics, \ 1446 "Inline intrinsics that can be statically resolved") \ 1447 \ 1448 product_pd(bool, ProfileInterpreter, \ 1449 "Profile at the bytecode level during interpretation") \ 1450 \ 1451 develop(bool, TraceProfileInterpreter, false, \ 1452 "Trace profiling at the bytecode level during interpretation. " \ 1453 "This outputs the profiling information collected to improve " \ 1454 "jit compilation.") \ 1455 \ 1456 develop_pd(bool, ProfileTraps, \ 1457 "Profile deoptimization traps at the bytecode level") \ 1458 \ 1459 product(intx, ProfileMaturityPercentage, 20, \ 1460 "number of method invocations/branches (expressed as % of " \ 1461 "CompileThreshold) before using the method's profile") \ 1462 range(0, 100) \ 1463 \ 1464 diagnostic(bool, PrintMethodData, false, \ 1465 "Print the results of +ProfileInterpreter at end of run") \ 1466 \ 1467 develop(bool, VerifyDataPointer, trueInDebug, \ 1468 "Verify the method data pointer during interpreter profiling") \ 1469 \ 1470 develop(bool, VerifyCompiledCode, false, \ 1471 "Include miscellaneous runtime verifications in nmethod code; " \ 1472 "default off because it disturbs nmethod size heuristics") \ 1473 \ 1474 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1475 "Manually make GC thread crash then dump java stack trace; " \ 1476 "Test only") \ 1477 \ 1478 /* compilation */ \ 1479 product(bool, UseCompiler, true, \ 1480 "Use Just-In-Time compilation") \ 1481 \ 1482 product(bool, UseCounterDecay, true, \ 1483 "Adjust recompilation counters") \ 1484 \ 1485 develop(intx, CounterHalfLifeTime, 30, \ 1486 "Half-life time of invocation counters (in seconds)") \ 1487 \ 1488 develop(intx, CounterDecayMinIntervalLength, 500, \ 1489 "The minimum interval (in milliseconds) between invocation of " \ 1490 "CounterDecay") \ 1491 \ 1492 product(bool, AlwaysCompileLoopMethods, false, \ 1493 "When using recompilation, never interpret methods " \ 1494 "containing loops") \ 1495 \ 1496 product(bool, DontCompileHugeMethods, true, \ 1497 "Do not compile methods > HugeMethodLimit") \ 1498 \ 1499 /* Bytecode escape analysis estimation. */ \ 1500 product(bool, EstimateArgEscape, true, \ 1501 "Analyze bytecodes to estimate escape state of arguments") \ 1502 \ 1503 product(intx, BCEATraceLevel, 0, \ 1504 "How much tracing to do of bytecode escape analysis estimates " \ 1505 "(0-3)") \ 1506 range(0, 3) \ 1507 \ 1508 product(intx, MaxBCEAEstimateLevel, 5, \ 1509 "Maximum number of nested calls that are analyzed by BC EA") \ 1510 range(0, max_jint) \ 1511 \ 1512 product(intx, MaxBCEAEstimateSize, 150, \ 1513 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1514 range(0, max_jint) \ 1515 \ 1516 product(intx, AllocatePrefetchStyle, 1, \ 1517 "0 = no prefetch, " \ 1518 "1 = generate prefetch instructions for each allocation, " \ 1519 "2 = use TLAB watermark to gate allocation prefetch, " \ 1520 "3 = generate one prefetch instruction per cache line") \ 1521 range(0, 3) \ 1522 \ 1523 product(intx, AllocatePrefetchDistance, -1, \ 1524 "Distance to prefetch ahead of allocation pointer. " \ 1525 "-1: use system-specific value (automatically determined") \ 1526 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 1527 \ 1528 product(intx, AllocatePrefetchLines, 3, \ 1529 "Number of lines to prefetch ahead of array allocation pointer") \ 1530 range(1, 64) \ 1531 \ 1532 product(intx, AllocateInstancePrefetchLines, 1, \ 1533 "Number of lines to prefetch ahead of instance allocation " \ 1534 "pointer") \ 1535 range(1, 64) \ 1536 \ 1537 product(intx, AllocatePrefetchStepSize, 16, \ 1538 "Step size in bytes of sequential prefetch instructions") \ 1539 range(1, 512) \ 1540 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1541 \ 1542 product(intx, AllocatePrefetchInstr, 0, \ 1543 "Select instruction to prefetch ahead of allocation pointer") \ 1544 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1545 \ 1546 /* deoptimization */ \ 1547 develop(bool, TraceDeoptimization, false, \ 1548 "Trace deoptimization") \ 1549 \ 1550 develop(bool, PrintDeoptimizationDetails, false, \ 1551 "Print more information about deoptimization") \ 1552 \ 1553 develop(bool, DebugDeoptimization, false, \ 1554 "Tracing various information while debugging deoptimization") \ 1555 \ 1556 product(intx, SelfDestructTimer, 0, \ 1557 "Will cause VM to terminate after a given time (in minutes) " \ 1558 "(0 means off)") \ 1559 range(0, max_intx) \ 1560 \ 1561 product(intx, MaxJavaStackTraceDepth, 1024, \ 1562 "The maximum number of lines in the stack trace for Java " \ 1563 "exceptions (0 means all)") \ 1564 range(0, max_jint/2) \ 1565 \ 1566 /* notice: the max range value here is max_jint, not max_intx */ \ 1567 /* because of overflow issue */ \ 1568 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1569 "Guarantee a safepoint (at least) every so many milliseconds " \ 1570 "(0 means none)") \ 1571 range(0, max_jint) \ 1572 \ 1573 product(intx, SafepointTimeoutDelay, 10000, \ 1574 "Delay in milliseconds for option SafepointTimeout") \ 1575 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1576 NOT_LP64(range(0, max_intx)) \ 1577 \ 1578 product(intx, NmethodSweepActivity, 10, \ 1579 "Removes cold nmethods from code cache if > 0. Higher values " \ 1580 "result in more aggressive sweeping") \ 1581 range(0, 2000) \ 1582 \ 1583 notproduct(bool, LogSweeper, false, \ 1584 "Keep a ring buffer of sweeper activity") \ 1585 \ 1586 notproduct(intx, SweeperLogEntries, 1024, \ 1587 "Number of records in the ring buffer of sweeper activity") \ 1588 \ 1589 notproduct(intx, MemProfilingInterval, 500, \ 1590 "Time between each invocation of the MemProfiler") \ 1591 \ 1592 develop(intx, MallocCatchPtr, -1, \ 1593 "Hit breakpoint when mallocing/freeing this pointer") \ 1594 \ 1595 notproduct(ccstrlist, SuppressErrorAt, "", \ 1596 "List of assertions (file:line) to muzzle") \ 1597 \ 1598 develop(intx, StackPrintLimit, 100, \ 1599 "number of stack frames to print in VM-level stack dump") \ 1600 \ 1601 notproduct(intx, MaxElementPrintSize, 256, \ 1602 "maximum number of elements to print") \ 1603 \ 1604 notproduct(intx, MaxSubklassPrintSize, 4, \ 1605 "maximum number of subklasses to print when printing klass") \ 1606 \ 1607 product(intx, MaxInlineLevel, 9, \ 1608 "maximum number of nested calls that are inlined") \ 1609 range(0, max_jint) \ 1610 \ 1611 product(intx, MaxRecursiveInlineLevel, 1, \ 1612 "maximum number of nested recursive calls that are inlined") \ 1613 range(0, max_jint) \ 1614 \ 1615 develop(intx, MaxForceInlineLevel, 100, \ 1616 "maximum number of nested calls that are forced for inlining " \ 1617 "(using CompileCommand or marked w/ @ForceInline)") \ 1618 range(0, max_jint) \ 1619 \ 1620 product_pd(intx, InlineSmallCode, \ 1621 "Only inline already compiled methods if their code size is " \ 1622 "less than this") \ 1623 range(0, max_jint) \ 1624 \ 1625 product(intx, MaxInlineSize, 35, \ 1626 "The maximum bytecode size of a method to be inlined") \ 1627 range(0, max_jint) \ 1628 \ 1629 product_pd(intx, FreqInlineSize, \ 1630 "The maximum bytecode size of a frequent method to be inlined") \ 1631 range(0, max_jint) \ 1632 \ 1633 product(intx, MaxTrivialSize, 6, \ 1634 "The maximum bytecode size of a trivial method to be inlined") \ 1635 range(0, max_jint) \ 1636 \ 1637 product(intx, MinInliningThreshold, 250, \ 1638 "The minimum invocation count a method needs to have to be " \ 1639 "inlined") \ 1640 range(0, max_jint) \ 1641 \ 1642 develop(intx, MethodHistogramCutoff, 100, \ 1643 "The cutoff value for method invocation histogram (+CountCalls)") \ 1644 \ 1645 develop(intx, DontYieldALotInterval, 10, \ 1646 "Interval between which yields will be dropped (milliseconds)") \ 1647 \ 1648 notproduct(intx, DeoptimizeALotInterval, 5, \ 1649 "Number of exits until DeoptimizeALot kicks in") \ 1650 \ 1651 notproduct(intx, ZombieALotInterval, 5, \ 1652 "Number of exits until ZombieALot kicks in") \ 1653 \ 1654 diagnostic(uintx, MallocMaxTestWords, 0, \ 1655 "If non-zero, maximum number of words that malloc/realloc can " \ 1656 "allocate (for testing only)") \ 1657 range(0, max_uintx) \ 1658 \ 1659 product(intx, TypeProfileWidth, 2, \ 1660 "Number of receiver types to record in call/cast profile") \ 1661 range(0, 8) \ 1662 \ 1663 develop(intx, BciProfileWidth, 2, \ 1664 "Number of return bci's to record in ret profile") \ 1665 \ 1666 product(intx, PerMethodRecompilationCutoff, 400, \ 1667 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1668 range(-1, max_intx) \ 1669 \ 1670 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1671 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1672 range(-1, max_intx) \ 1673 \ 1674 product(intx, PerMethodTrapLimit, 100, \ 1675 "Limit on traps (of one kind) in a method (includes inlines)") \ 1676 range(0, max_jint) \ 1677 \ 1678 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1679 "Limit on speculative traps (of one kind) in a method " \ 1680 "(includes inlines)") \ 1681 range(0, max_jint) \ 1682 \ 1683 product(intx, PerBytecodeTrapLimit, 4, \ 1684 "Limit on traps (of one kind) at a particular BCI") \ 1685 range(0, max_jint) \ 1686 \ 1687 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1688 "Extra method data trap entries for speculation") \ 1689 \ 1690 develop(intx, InlineFrequencyRatio, 20, \ 1691 "Ratio of call site execution to caller method invocation") \ 1692 range(0, max_jint) \ 1693 \ 1694 diagnostic_pd(intx, InlineFrequencyCount, \ 1695 "Count of call site execution necessary to trigger frequent " \ 1696 "inlining") \ 1697 range(0, max_jint) \ 1698 \ 1699 develop(intx, InlineThrowCount, 50, \ 1700 "Force inlining of interpreted methods that throw this often") \ 1701 range(0, max_jint) \ 1702 \ 1703 develop(intx, InlineThrowMaxSize, 200, \ 1704 "Force inlining of throwing methods smaller than this") \ 1705 range(0, max_jint) \ 1706 \ 1707 develop(intx, ProfilerNodeSize, 1024, \ 1708 "Size in K to allocate for the Profile Nodes of each thread") \ 1709 range(0, 1024) \ 1710 \ 1711 product_pd(size_t, MetaspaceSize, \ 1712 "Initial threshold (in bytes) at which a garbage collection " \ 1713 "is done to reduce Metaspace usage") \ 1714 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1715 \ 1716 product(size_t, MaxMetaspaceSize, max_uintx, \ 1717 "Maximum size of Metaspaces (in bytes)") \ 1718 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1719 \ 1720 product(size_t, CompressedClassSpaceSize, 1*G, \ 1721 "Maximum size of class area in Metaspace when compressed " \ 1722 "class pointers are used") \ 1723 range(1*M, 3*G) \ 1724 \ 1725 manageable(uintx, MinHeapFreeRatio, 40, \ 1726 "The minimum percentage of heap free after GC to avoid expansion."\ 1727 " For most GCs this applies to the old generation. In G1 and" \ 1728 " ParallelGC it applies to the whole heap.") \ 1729 range(0, 100) \ 1730 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1731 \ 1732 manageable(uintx, MaxHeapFreeRatio, 70, \ 1733 "The maximum percentage of heap free after GC to avoid shrinking."\ 1734 " For most GCs this applies to the old generation. In G1 and" \ 1735 " ParallelGC it applies to the whole heap.") \ 1736 range(0, 100) \ 1737 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1738 \ 1739 product(bool, ShrinkHeapInSteps, true, \ 1740 "When disabled, informs the GC to shrink the java heap directly" \ 1741 " to the target size at the next full GC rather than requiring" \ 1742 " smaller steps during multiple full GCs.") \ 1743 \ 1744 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1745 "Number of milliseconds per MB of free space in the heap") \ 1746 range(0, max_intx) \ 1747 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1748 \ 1749 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1750 "The minimum change in heap space due to GC (in bytes)") \ 1751 range(0, max_uintx) \ 1752 \ 1753 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1754 "The minimum expansion of Metaspace (in bytes)") \ 1755 range(0, max_uintx) \ 1756 \ 1757 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1758 "The maximum percentage of Metaspace free after GC to avoid " \ 1759 "shrinking") \ 1760 range(0, 100) \ 1761 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1762 \ 1763 product(uintx, MinMetaspaceFreeRatio, 40, \ 1764 "The minimum percentage of Metaspace free after GC to avoid " \ 1765 "expansion") \ 1766 range(0, 99) \ 1767 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1768 \ 1769 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1770 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1771 range(0, max_uintx) \ 1772 \ 1773 /* stack parameters */ \ 1774 product_pd(intx, StackYellowPages, \ 1775 "Number of yellow zone (recoverable overflows) pages of size " \ 1776 "4KB. If pages are bigger yellow zone is aligned up.") \ 1777 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1778 \ 1779 product_pd(intx, StackRedPages, \ 1780 "Number of red zone (unrecoverable overflows) pages of size " \ 1781 "4KB. If pages are bigger red zone is aligned up.") \ 1782 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1783 \ 1784 product_pd(intx, StackReservedPages, \ 1785 "Number of reserved zone (reserved to annotated methods) pages" \ 1786 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1787 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1788 \ 1789 product(bool, RestrictReservedStack, true, \ 1790 "Restrict @ReservedStackAccess to trusted classes") \ 1791 \ 1792 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1793 product_pd(intx, StackShadowPages, \ 1794 "Number of shadow zone (for overflow checking) pages of size " \ 1795 "4KB. If pages are bigger shadow zone is aligned up. " \ 1796 "This should exceed the depth of the VM and native call stack.") \ 1797 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1798 \ 1799 product_pd(intx, ThreadStackSize, \ 1800 "Thread Stack Size (in Kbytes)") \ 1801 range(0, 1 * M) \ 1802 \ 1803 product_pd(intx, VMThreadStackSize, \ 1804 "Non-Java Thread Stack Size (in Kbytes)") \ 1805 range(0, max_intx/(1 * K)) \ 1806 \ 1807 product_pd(intx, CompilerThreadStackSize, \ 1808 "Compiler Thread Stack Size (in Kbytes)") \ 1809 range(0, max_intx/(1 * K)) \ 1810 \ 1811 develop_pd(size_t, JVMInvokeMethodSlack, \ 1812 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1813 \ 1814 /* code cache parameters */ \ 1815 develop_pd(uintx, CodeCacheSegmentSize, \ 1816 "Code cache segment size (in bytes) - smallest unit of " \ 1817 "allocation") \ 1818 range(1, 1024) \ 1819 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1820 \ 1821 develop_pd(intx, CodeEntryAlignment, \ 1822 "Code entry alignment for generated code (in bytes)") \ 1823 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1824 \ 1825 product_pd(intx, OptoLoopAlignment, \ 1826 "Align inner loops to zero relative to this modulus") \ 1827 range(1, 16) \ 1828 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1829 \ 1830 product_pd(uintx, InitialCodeCacheSize, \ 1831 "Initial code cache size (in bytes)") \ 1832 range(os::vm_page_size(), max_uintx) \ 1833 \ 1834 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1835 "Minimum code cache size (in bytes) required to start VM.") \ 1836 range(0, max_uintx) \ 1837 \ 1838 product(bool, SegmentedCodeCache, false, \ 1839 "Use a segmented code cache") \ 1840 \ 1841 product_pd(uintx, ReservedCodeCacheSize, \ 1842 "Reserved code cache size (in bytes) - maximum code cache size") \ 1843 range(os::vm_page_size(), max_uintx) \ 1844 \ 1845 product_pd(uintx, NonProfiledCodeHeapSize, \ 1846 "Size of code heap with non-profiled methods (in bytes)") \ 1847 range(0, max_uintx) \ 1848 \ 1849 product_pd(uintx, ProfiledCodeHeapSize, \ 1850 "Size of code heap with profiled methods (in bytes)") \ 1851 range(0, max_uintx) \ 1852 \ 1853 product_pd(uintx, NonNMethodCodeHeapSize, \ 1854 "Size of code heap with non-nmethods (in bytes)") \ 1855 range(os::vm_page_size(), max_uintx) \ 1856 \ 1857 product_pd(uintx, CodeCacheExpansionSize, \ 1858 "Code cache expansion size (in bytes)") \ 1859 range(32*K, max_uintx) \ 1860 \ 1861 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1862 "Minimum number of segments in a code cache block") \ 1863 range(1, 100) \ 1864 \ 1865 notproduct(bool, ExitOnFullCodeCache, false, \ 1866 "Exit the VM if we fill the code cache") \ 1867 \ 1868 product(bool, UseCodeCacheFlushing, true, \ 1869 "Remove cold/old nmethods from the code cache") \ 1870 \ 1871 product(uintx, StartAggressiveSweepingAt, 10, \ 1872 "Start aggressive sweeping if X[%] of the code cache is free." \ 1873 "Segmented code cache: X[%] of the non-profiled heap." \ 1874 "Non-segmented code cache: X[%] of the total code cache") \ 1875 range(0, 100) \ 1876 \ 1877 /* AOT parameters */ \ 1878 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 1879 "Use AOT compiled files") \ 1880 \ 1881 product(ccstrlist, AOTLibrary, NULL, \ 1882 "AOT library") \ 1883 \ 1884 product(bool, PrintAOT, false, \ 1885 "Print used AOT klasses and methods") \ 1886 \ 1887 notproduct(bool, PrintAOTStatistics, false, \ 1888 "Print AOT statistics") \ 1889 \ 1890 diagnostic(bool, UseAOTStrictLoading, false, \ 1891 "Exit the VM if any of the AOT libraries has invalid config") \ 1892 \ 1893 product(bool, CalculateClassFingerprint, false, \ 1894 "Calculate class fingerprint") \ 1895 \ 1896 /* interpreter debugging */ \ 1897 develop(intx, BinarySwitchThreshold, 5, \ 1898 "Minimal number of lookupswitch entries for rewriting to binary " \ 1899 "switch") \ 1900 \ 1901 develop(intx, StopInterpreterAt, 0, \ 1902 "Stop interpreter execution at specified bytecode number") \ 1903 \ 1904 develop(intx, TraceBytecodesAt, 0, \ 1905 "Trace bytecodes starting with specified bytecode number") \ 1906 \ 1907 /* compiler interface */ \ 1908 develop(intx, CIStart, 0, \ 1909 "The id of the first compilation to permit") \ 1910 \ 1911 develop(intx, CIStop, max_jint, \ 1912 "The id of the last compilation to permit") \ 1913 \ 1914 develop(intx, CIStartOSR, 0, \ 1915 "The id of the first osr compilation to permit " \ 1916 "(CICountOSR must be on)") \ 1917 \ 1918 develop(intx, CIStopOSR, max_jint, \ 1919 "The id of the last osr compilation to permit " \ 1920 "(CICountOSR must be on)") \ 1921 \ 1922 develop(intx, CIBreakAtOSR, -1, \ 1923 "The id of osr compilation to break at") \ 1924 \ 1925 develop(intx, CIBreakAt, -1, \ 1926 "The id of compilation to break at") \ 1927 \ 1928 product(ccstrlist, CompileOnly, "", \ 1929 "List of methods (pkg/class.name) to restrict compilation to") \ 1930 \ 1931 product(ccstr, CompileCommandFile, NULL, \ 1932 "Read compiler commands from this file [.hotspot_compiler]") \ 1933 \ 1934 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1935 "Read compiler directives from this file") \ 1936 \ 1937 product(ccstrlist, CompileCommand, "", \ 1938 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1939 \ 1940 develop(bool, ReplayCompiles, false, \ 1941 "Enable replay of compilations from ReplayDataFile") \ 1942 \ 1943 product(ccstr, ReplayDataFile, NULL, \ 1944 "File containing compilation replay information" \ 1945 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1946 \ 1947 product(ccstr, InlineDataFile, NULL, \ 1948 "File containing inlining replay information" \ 1949 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1950 \ 1951 develop(intx, ReplaySuppressInitializers, 2, \ 1952 "Control handling of class initialization during replay: " \ 1953 "0 - don't do anything special; " \ 1954 "1 - treat all class initializers as empty; " \ 1955 "2 - treat class initializers for application classes as empty; " \ 1956 "3 - allow all class initializers to run during bootstrap but " \ 1957 " pretend they are empty after starting replay") \ 1958 range(0, 3) \ 1959 \ 1960 develop(bool, ReplayIgnoreInitErrors, false, \ 1961 "Ignore exceptions thrown during initialization for replay") \ 1962 \ 1963 product(bool, DumpReplayDataOnError, true, \ 1964 "Record replay data for crashing compiler threads") \ 1965 \ 1966 product(bool, CICompilerCountPerCPU, false, \ 1967 "1 compiler thread for log(N CPUs)") \ 1968 \ 1969 notproduct(intx, CICrashAt, -1, \ 1970 "id of compilation to trigger assert in compiler thread for " \ 1971 "the purpose of testing, e.g. generation of replay data") \ 1972 notproduct(bool, CIObjectFactoryVerify, false, \ 1973 "enable potentially expensive verification in ciObjectFactory") \ 1974 \ 1975 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1976 "Abort VM when method had failed to compile.") \ 1977 \ 1978 /* Priorities */ \ 1979 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1980 \ 1981 product(intx, ThreadPriorityPolicy, 0, \ 1982 "0 : Normal. "\ 1983 " VM chooses priorities that are appropriate for normal "\ 1984 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1985 " to normal native priority. Java priorities below " \ 1986 " NORM_PRIORITY map to lower native priority values. On "\ 1987 " Windows applications are allowed to use higher native "\ 1988 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1989 " not use the highest possible native priority, "\ 1990 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1991 " system threads. On Linux thread priorities are ignored "\ 1992 " because the OS does not support static priority in "\ 1993 " SCHED_OTHER scheduling class which is the only choice for "\ 1994 " non-root, non-realtime applications. "\ 1995 "1 : Aggressive. "\ 1996 " Java thread priorities map over to the entire range of "\ 1997 " native thread priorities. Higher Java thread priorities map "\ 1998 " to higher native thread priorities. This policy should be "\ 1999 " used with care, as sometimes it can cause performance "\ 2000 " degradation in the application and/or the entire system. On "\ 2001 " Linux/BSD/macOS this policy requires root privilege or an "\ 2002 " extended capability.") \ 2003 range(0, 1) \ 2004 \ 2005 product(bool, ThreadPriorityVerbose, false, \ 2006 "Print priority changes") \ 2007 \ 2008 product(intx, CompilerThreadPriority, -1, \ 2009 "The native priority at which compiler threads should run " \ 2010 "(-1 means no change)") \ 2011 range(min_jint, max_jint) \ 2012 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 2013 \ 2014 product(intx, VMThreadPriority, -1, \ 2015 "The native priority at which the VM thread should run " \ 2016 "(-1 means no change)") \ 2017 range(-1, 127) \ 2018 \ 2019 product(intx, JavaPriority1_To_OSPriority, -1, \ 2020 "Map Java priorities to OS priorities") \ 2021 range(-1, 127) \ 2022 \ 2023 product(intx, JavaPriority2_To_OSPriority, -1, \ 2024 "Map Java priorities to OS priorities") \ 2025 range(-1, 127) \ 2026 \ 2027 product(intx, JavaPriority3_To_OSPriority, -1, \ 2028 "Map Java priorities to OS priorities") \ 2029 range(-1, 127) \ 2030 \ 2031 product(intx, JavaPriority4_To_OSPriority, -1, \ 2032 "Map Java priorities to OS priorities") \ 2033 range(-1, 127) \ 2034 \ 2035 product(intx, JavaPriority5_To_OSPriority, -1, \ 2036 "Map Java priorities to OS priorities") \ 2037 range(-1, 127) \ 2038 \ 2039 product(intx, JavaPriority6_To_OSPriority, -1, \ 2040 "Map Java priorities to OS priorities") \ 2041 range(-1, 127) \ 2042 \ 2043 product(intx, JavaPriority7_To_OSPriority, -1, \ 2044 "Map Java priorities to OS priorities") \ 2045 range(-1, 127) \ 2046 \ 2047 product(intx, JavaPriority8_To_OSPriority, -1, \ 2048 "Map Java priorities to OS priorities") \ 2049 range(-1, 127) \ 2050 \ 2051 product(intx, JavaPriority9_To_OSPriority, -1, \ 2052 "Map Java priorities to OS priorities") \ 2053 range(-1, 127) \ 2054 \ 2055 product(intx, JavaPriority10_To_OSPriority,-1, \ 2056 "Map Java priorities to OS priorities") \ 2057 range(-1, 127) \ 2058 \ 2059 experimental(bool, UseCriticalJavaThreadPriority, false, \ 2060 "Java thread priority 10 maps to critical scheduling priority") \ 2061 \ 2062 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 2063 "Compiler thread(s) run at critical scheduling priority") \ 2064 \ 2065 experimental(bool, UseCriticalCMSThreadPriority, false, \ 2066 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 2067 \ 2068 develop(intx, NewCodeParameter, 0, \ 2069 "Testing Only: Create a dedicated integer parameter before " \ 2070 "putback") \ 2071 \ 2072 /* new oopmap storage allocation */ \ 2073 develop(intx, MinOopMapAllocation, 8, \ 2074 "Minimum number of OopMap entries in an OopMapSet") \ 2075 \ 2076 /* Background Compilation */ \ 2077 develop(intx, LongCompileThreshold, 50, \ 2078 "Used with +TraceLongCompiles") \ 2079 \ 2080 /* recompilation */ \ 2081 product_pd(intx, CompileThreshold, \ 2082 "number of interpreted method invocations before (re-)compiling") \ 2083 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 2084 \ 2085 product(double, CompileThresholdScaling, 1.0, \ 2086 "Factor to control when first compilation happens " \ 2087 "(both with and without tiered compilation): " \ 2088 "values greater than 1.0 delay counter overflow, " \ 2089 "values between 0 and 1.0 rush counter overflow, " \ 2090 "value of 1.0 leaves compilation thresholds unchanged " \ 2091 "value of 0.0 is equivalent to -Xint. " \ 2092 "" \ 2093 "Flag can be set as per-method option. " \ 2094 "If a value is specified for a method, compilation thresholds " \ 2095 "for that method are scaled by both the value of the global flag "\ 2096 "and the value of the per-method flag.") \ 2097 range(0.0, DBL_MAX) \ 2098 \ 2099 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 2100 "Interpreter (tier 0) invocation notification frequency") \ 2101 range(0, 30) \ 2102 \ 2103 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 2104 "C1 without MDO (tier 2) invocation notification frequency") \ 2105 range(0, 30) \ 2106 \ 2107 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 2108 "C1 with MDO profiling (tier 3) invocation notification " \ 2109 "frequency") \ 2110 range(0, 30) \ 2111 \ 2112 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 2113 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 2114 range(0, 30) \ 2115 \ 2116 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 2117 "Interpreter (tier 0) invocation notification frequency") \ 2118 range(0, 30) \ 2119 \ 2120 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 2121 "C1 without MDO (tier 2) invocation notification frequency") \ 2122 range(0, 30) \ 2123 \ 2124 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 2125 "C1 with MDO profiling (tier 3) invocation notification " \ 2126 "frequency") \ 2127 range(0, 30) \ 2128 \ 2129 product(intx, Tier2CompileThreshold, 0, \ 2130 "threshold at which tier 2 compilation is invoked") \ 2131 range(0, max_jint) \ 2132 \ 2133 product(intx, Tier2BackEdgeThreshold, 0, \ 2134 "Back edge threshold at which tier 2 compilation is invoked") \ 2135 range(0, max_jint) \ 2136 \ 2137 product(intx, Tier3InvocationThreshold, 200, \ 2138 "Compile if number of method invocations crosses this " \ 2139 "threshold") \ 2140 range(0, max_jint) \ 2141 \ 2142 product(intx, Tier3MinInvocationThreshold, 100, \ 2143 "Minimum invocation to compile at tier 3") \ 2144 range(0, max_jint) \ 2145 \ 2146 product(intx, Tier3CompileThreshold, 2000, \ 2147 "Threshold at which tier 3 compilation is invoked (invocation " \ 2148 "minimum must be satisfied)") \ 2149 range(0, max_jint) \ 2150 \ 2151 product(intx, Tier3BackEdgeThreshold, 60000, \ 2152 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2153 range(0, max_jint) \ 2154 \ 2155 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2156 "Compile if number of method invocations crosses this " \ 2157 "threshold if coming from AOT") \ 2158 range(0, max_jint) \ 2159 \ 2160 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2161 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2162 range(0, max_jint) \ 2163 \ 2164 product(intx, Tier3AOTCompileThreshold, 15000, \ 2165 "Threshold at which tier 3 compilation is invoked (invocation " \ 2166 "minimum must be satisfied) if coming from AOT") \ 2167 range(0, max_jint) \ 2168 \ 2169 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2170 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2171 "if coming from AOT") \ 2172 range(0, max_jint) \ 2173 \ 2174 product(intx, Tier4InvocationThreshold, 5000, \ 2175 "Compile if number of method invocations crosses this " \ 2176 "threshold") \ 2177 range(0, max_jint) \ 2178 \ 2179 product(intx, Tier4MinInvocationThreshold, 600, \ 2180 "Minimum invocation to compile at tier 4") \ 2181 range(0, max_jint) \ 2182 \ 2183 product(intx, Tier4CompileThreshold, 15000, \ 2184 "Threshold at which tier 4 compilation is invoked (invocation " \ 2185 "minimum must be satisfied") \ 2186 range(0, max_jint) \ 2187 \ 2188 product(intx, Tier4BackEdgeThreshold, 40000, \ 2189 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2190 range(0, max_jint) \ 2191 \ 2192 product(intx, Tier3DelayOn, 5, \ 2193 "If C2 queue size grows over this amount per compiler thread " \ 2194 "stop compiling at tier 3 and start compiling at tier 2") \ 2195 range(0, max_jint) \ 2196 \ 2197 product(intx, Tier3DelayOff, 2, \ 2198 "If C2 queue size is less than this amount per compiler thread " \ 2199 "allow methods compiled at tier 2 transition to tier 3") \ 2200 range(0, max_jint) \ 2201 \ 2202 product(intx, Tier3LoadFeedback, 5, \ 2203 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2204 "reaches this amount per compiler thread") \ 2205 range(0, max_jint) \ 2206 \ 2207 product(intx, Tier4LoadFeedback, 3, \ 2208 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2209 "reaches this amount per compiler thread") \ 2210 range(0, max_jint) \ 2211 \ 2212 product(intx, TieredCompileTaskTimeout, 50, \ 2213 "Kill compile task if method was not used within " \ 2214 "given timeout in milliseconds") \ 2215 range(0, max_intx) \ 2216 \ 2217 product(intx, TieredStopAtLevel, 4, \ 2218 "Stop at given compilation level") \ 2219 range(0, 4) \ 2220 \ 2221 product(intx, Tier0ProfilingStartPercentage, 200, \ 2222 "Start profiling in interpreter if the counters exceed tier 3 " \ 2223 "thresholds by the specified percentage") \ 2224 range(0, max_jint) \ 2225 \ 2226 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2227 "Increase the compile threshold for C1 compilation if the code " \ 2228 "cache is filled by the specified percentage") \ 2229 range(0, 99) \ 2230 \ 2231 product(intx, TieredRateUpdateMinTime, 1, \ 2232 "Minimum rate sampling interval (in milliseconds)") \ 2233 range(0, max_intx) \ 2234 \ 2235 product(intx, TieredRateUpdateMaxTime, 25, \ 2236 "Maximum rate sampling interval (in milliseconds)") \ 2237 range(0, max_intx) \ 2238 \ 2239 product_pd(bool, TieredCompilation, \ 2240 "Enable tiered compilation") \ 2241 \ 2242 product(bool, PrintTieredEvents, false, \ 2243 "Print tiered events notifications") \ 2244 \ 2245 product_pd(intx, OnStackReplacePercentage, \ 2246 "NON_TIERED number of method invocations/branches (expressed as " \ 2247 "% of CompileThreshold) before (re-)compiling OSR code") \ 2248 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2249 \ 2250 product(intx, InterpreterProfilePercentage, 33, \ 2251 "NON_TIERED number of method invocations/branches (expressed as " \ 2252 "% of CompileThreshold) before profiling in the interpreter") \ 2253 range(0, 100) \ 2254 \ 2255 develop(intx, MaxRecompilationSearchLength, 10, \ 2256 "The maximum number of frames to inspect when searching for " \ 2257 "recompilee") \ 2258 \ 2259 develop(intx, MaxInterpretedSearchLength, 3, \ 2260 "The maximum number of interpreted frames to skip when searching "\ 2261 "for recompilee") \ 2262 \ 2263 develop(intx, DesiredMethodLimit, 8000, \ 2264 "The desired maximum method size (in bytecodes) after inlining") \ 2265 \ 2266 develop(intx, HugeMethodLimit, 8000, \ 2267 "Don't compile methods larger than this if " \ 2268 "+DontCompileHugeMethods") \ 2269 \ 2270 /* Properties for Java libraries */ \ 2271 \ 2272 product(uint64_t, MaxDirectMemorySize, 0, \ 2273 "Maximum total size of NIO direct-buffer allocations") \ 2274 range(0, max_jlong) \ 2275 \ 2276 /* Flags used for temporary code during development */ \ 2277 \ 2278 diagnostic(bool, UseNewCode, false, \ 2279 "Testing Only: Use the new version while testing") \ 2280 \ 2281 diagnostic(bool, UseNewCode2, false, \ 2282 "Testing Only: Use the new version while testing") \ 2283 \ 2284 diagnostic(bool, UseNewCode3, false, \ 2285 "Testing Only: Use the new version while testing") \ 2286 \ 2287 /* flags for performance data collection */ \ 2288 \ 2289 product(bool, UsePerfData, true, \ 2290 "Flag to disable jvmstat instrumentation for performance testing "\ 2291 "and problem isolation purposes") \ 2292 \ 2293 product(bool, PerfDataSaveToFile, false, \ 2294 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2295 \ 2296 product(ccstr, PerfDataSaveFile, NULL, \ 2297 "Save PerfData memory to the specified absolute pathname. " \ 2298 "The string %p in the file name (if present) " \ 2299 "will be replaced by pid") \ 2300 \ 2301 product(intx, PerfDataSamplingInterval, 50, \ 2302 "Data sampling interval (in milliseconds)") \ 2303 range(PeriodicTask::min_interval, max_jint) \ 2304 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2305 \ 2306 product(bool, PerfDisableSharedMem, false, \ 2307 "Store performance data in standard memory") \ 2308 \ 2309 product(intx, PerfDataMemorySize, 32*K, \ 2310 "Size of performance data memory region. Will be rounded " \ 2311 "up to a multiple of the native os page size.") \ 2312 range(128, 32*64*K) \ 2313 \ 2314 product(intx, PerfMaxStringConstLength, 1024, \ 2315 "Maximum PerfStringConstant string length before truncation") \ 2316 range(32, 32*K) \ 2317 \ 2318 product(bool, PerfAllowAtExitRegistration, false, \ 2319 "Allow registration of atexit() methods") \ 2320 \ 2321 product(bool, PerfBypassFileSystemCheck, false, \ 2322 "Bypass Win32 file system criteria checks (Windows Only)") \ 2323 \ 2324 product(intx, UnguardOnExecutionViolation, 0, \ 2325 "Unguard page and retry on no-execute fault (Win32 only) " \ 2326 "0=off, 1=conservative, 2=aggressive") \ 2327 range(0, 2) \ 2328 \ 2329 /* Serviceability Support */ \ 2330 \ 2331 product(bool, ManagementServer, false, \ 2332 "Create JMX Management Server") \ 2333 \ 2334 product(bool, DisableAttachMechanism, false, \ 2335 "Disable mechanism that allows tools to attach to this VM") \ 2336 \ 2337 product(bool, StartAttachListener, false, \ 2338 "Always start Attach Listener at VM startup") \ 2339 \ 2340 product(bool, EnableDynamicAgentLoading, true, \ 2341 "Allow tools to load agents with the attach mechanism") \ 2342 \ 2343 manageable(bool, PrintConcurrentLocks, false, \ 2344 "Print java.util.concurrent locks in thread dump") \ 2345 \ 2346 /* Shared spaces */ \ 2347 \ 2348 product(bool, UseSharedSpaces, true, \ 2349 "Use shared spaces for metadata") \ 2350 \ 2351 product(bool, VerifySharedSpaces, false, \ 2352 "Verify shared spaces (false for default archive, true for " \ 2353 "archive specified by -XX:SharedArchiveFile)") \ 2354 \ 2355 product(bool, RequireSharedSpaces, false, \ 2356 "Require shared spaces for metadata") \ 2357 \ 2358 product(bool, DumpSharedSpaces, false, \ 2359 "Special mode: JVM reads a class list, loads classes, builds " \ 2360 "shared spaces, and dumps the shared spaces to a file to be " \ 2361 "used in future JVM runs") \ 2362 \ 2363 product(bool, PrintSharedArchiveAndExit, false, \ 2364 "Print shared archive file contents") \ 2365 \ 2366 product(bool, PrintSharedDictionary, false, \ 2367 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2368 "dictionary") \ 2369 \ 2370 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2371 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2372 "Address to allocate shared memory region for class data") \ 2373 range(0, SIZE_MAX) \ 2374 \ 2375 product(ccstr, SharedArchiveConfigFile, NULL, \ 2376 "Data to add to the CDS archive file") \ 2377 \ 2378 product(uintx, SharedSymbolTableBucketSize, 4, \ 2379 "Average number of symbols per bucket in shared table") \ 2380 range(2, 246) \ 2381 \ 2382 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2383 "Allow Java agent to be run with CDS dumping") \ 2384 \ 2385 diagnostic(bool, PrintMethodHandleStubs, false, \ 2386 "Print generated stub code for method handles") \ 2387 \ 2388 develop(bool, TraceMethodHandles, false, \ 2389 "trace internal method handle operations") \ 2390 \ 2391 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2392 "perform extra checks when constructing method handles") \ 2393 \ 2394 diagnostic(bool, ShowHiddenFrames, false, \ 2395 "show method handle implementation frames (usually hidden)") \ 2396 \ 2397 experimental(bool, TrustFinalNonStaticFields, false, \ 2398 "trust final non-static declarations for constant folding") \ 2399 \ 2400 diagnostic(bool, FoldStableValues, true, \ 2401 "Optimize loads from stable fields (marked w/ @Stable)") \ 2402 \ 2403 develop(bool, TraceInvokeDynamic, false, \ 2404 "trace internal invoke dynamic operations") \ 2405 \ 2406 diagnostic(int, UseBootstrapCallInfo, 1, \ 2407 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2408 "resolved before the bootstrap method is called; 1: when a BSM " \ 2409 "that may accept a BootstrapCallInfo is detected, use that API " \ 2410 "to pass BSM arguments, which allows the BSM to delay their " \ 2411 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2412 "via that API, instead of with the eagerly-resolved array.") \ 2413 \ 2414 diagnostic(bool, PauseAtStartup, false, \ 2415 "Causes the VM to pause at startup time and wait for the pause " \ 2416 "file to be removed (default: ./vm.paused.<pid>)") \ 2417 \ 2418 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2419 "The file to create and for whose removal to await when pausing " \ 2420 "at startup. (default: ./vm.paused.<pid>)") \ 2421 \ 2422 diagnostic(bool, PauseAtExit, false, \ 2423 "Pause and wait for keypress on exit if a debugger is attached") \ 2424 \ 2425 product(bool, ExtendedDTraceProbes, false, \ 2426 "Enable performance-impacting dtrace probes") \ 2427 \ 2428 product(bool, DTraceMethodProbes, false, \ 2429 "Enable dtrace probes for method-entry and method-exit") \ 2430 \ 2431 product(bool, DTraceAllocProbes, false, \ 2432 "Enable dtrace probes for object allocation") \ 2433 \ 2434 product(bool, DTraceMonitorProbes, false, \ 2435 "Enable dtrace probes for monitor events") \ 2436 \ 2437 product(bool, RelaxAccessControlCheck, false, \ 2438 "Relax the access control checks in the verifier") \ 2439 \ 2440 product(uintx, StringTableSize, defaultStringTableSize, \ 2441 "Number of buckets in the interned String table " \ 2442 "(will be rounded to nearest higher power of 2)") \ 2443 range(minimumStringTableSize, 16777216ul) \ 2444 \ 2445 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2446 "Number of buckets in the JVM internal Symbol table") \ 2447 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 2448 \ 2449 product(bool, UseStringDeduplication, false, \ 2450 "Use string deduplication") \ 2451 \ 2452 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2453 "A string must reach this age (or be promoted to an old region) " \ 2454 "to be considered for deduplication") \ 2455 range(1, markOopDesc::max_age) \ 2456 \ 2457 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2458 "Force table resize every time the table is scanned") \ 2459 \ 2460 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2461 "Force table rehash every time the table is scanned") \ 2462 \ 2463 diagnostic(bool, WhiteBoxAPI, false, \ 2464 "Enable internal testing APIs") \ 2465 \ 2466 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2467 "Default survivor space alignment in bytes") \ 2468 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2469 \ 2470 product(ccstr, DumpLoadedClassList, NULL, \ 2471 "Dump the names all loaded classes, that could be stored into " \ 2472 "the CDS archive, in the specified file") \ 2473 \ 2474 product(ccstr, SharedClassListFile, NULL, \ 2475 "Override the default CDS class list") \ 2476 \ 2477 product(ccstr, SharedArchiveFile, NULL, \ 2478 "Override the default location of the CDS archive file") \ 2479 \ 2480 product(ccstr, ExtraSharedClassListFile, NULL, \ 2481 "Extra classlist for building the CDS archive file") \ 2482 \ 2483 experimental(size_t, ArrayAllocatorMallocLimit, \ 2484 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2485 "Allocation less than this value will be allocated " \ 2486 "using malloc. Larger allocations will use mmap.") \ 2487 \ 2488 experimental(bool, AlwaysAtomicAccesses, false, \ 2489 "Accesses to all variables should always be atomic") \ 2490 \ 2491 diagnostic(bool, UseUnalignedAccesses, false, \ 2492 "Use unaligned memory accesses in Unsafe") \ 2493 \ 2494 product_pd(bool, PreserveFramePointer, \ 2495 "Use the FP register for holding the frame pointer " \ 2496 "and not as a general purpose register.") \ 2497 \ 2498 diagnostic(bool, CheckIntrinsics, true, \ 2499 "When a class C is loaded, check that " \ 2500 "(1) all intrinsics defined by the VM for class C are present "\ 2501 "in the loaded class file and are marked with the " \ 2502 "@HotSpotIntrinsicCandidate annotation, that " \ 2503 "(2) there is an intrinsic registered for all loaded methods " \ 2504 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2505 "annotation, and that " \ 2506 "(3) no orphan methods exist for class C (i.e., methods for " \ 2507 "which the VM declares an intrinsic but that are not declared "\ 2508 "in the loaded class C. " \ 2509 "Check (3) is available only in debug builds.") \ 2510 \ 2511 diagnostic_pd(intx, InitArrayShortSize, \ 2512 "Threshold small size (in bytes) for clearing arrays. " \ 2513 "Anything this size or smaller may get converted to discrete " \ 2514 "scalar stores.") \ 2515 range(0, max_intx) \ 2516 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2517 \ 2518 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2519 "Disable backwards compatibility for compile commands.") \ 2520 \ 2521 diagnostic(bool, CompilerDirectivesPrint, false, \ 2522 "Print compiler directives on installation.") \ 2523 diagnostic(int, CompilerDirectivesLimit, 50, \ 2524 "Limit on number of compiler directives.") \ 2525 \ 2526 product(ccstr, AllocateHeapAt, NULL, \ 2527 "Path to the directoy where a temporary file will be created " \ 2528 "to use as the backing store for Java Heap.") \ 2529 \ 2530 experimental(ccstr, AllocateOldGenAt, NULL, \ 2531 "Path to the directoy where a temporary file will be " \ 2532 "created to use as the backing store for old generation." \ 2533 "File of size Xmx is pre-allocated for performance reason, so" \ 2534 "we need that much space available") \ 2535 \ 2536 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2537 "Run periodic metaspace verifications (0 - none, " \ 2538 "1 - always, >1 every nth interval)") \ 2539 \ 2540 diagnostic(bool, ShowRegistersOnAssert, true, \ 2541 "On internal errors, include registers in error report.") \ 2542 \ 2543 experimental(bool, UseSwitchProfiling, true, \ 2544 "leverage profiling for table/lookup switch") \ 2545 \ 2546 JFR_ONLY(product(bool, FlightRecorder, false, \ 2547 "Enable Flight Recorder")) \ 2548 \ 2549 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2550 "Flight Recorder options")) \ 2551 \ 2552 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2553 "Start flight recording with options")) \ 2554 \ 2555 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2556 "Use platform unstable time where supported for timestamps only") 2557 2558 #define VM_FLAGS(develop, \ 2559 develop_pd, \ 2560 product, \ 2561 product_pd, \ 2562 diagnostic, \ 2563 diagnostic_pd, \ 2564 experimental, \ 2565 notproduct, \ 2566 manageable, \ 2567 product_rw, \ 2568 lp64_product, \ 2569 range, \ 2570 constraint, \ 2571 writeable) \ 2572 \ 2573 RUNTIME_FLAGS( \ 2574 develop, \ 2575 develop_pd, \ 2576 product, \ 2577 product_pd, \ 2578 diagnostic, \ 2579 diagnostic_pd, \ 2580 experimental, \ 2581 notproduct, \ 2582 manageable, \ 2583 product_rw, \ 2584 lp64_product, \ 2585 range, \ 2586 constraint, \ 2587 writeable) \ 2588 \ 2589 GC_FLAGS( \ 2590 develop, \ 2591 develop_pd, \ 2592 product, \ 2593 product_pd, \ 2594 diagnostic, \ 2595 diagnostic_pd, \ 2596 experimental, \ 2597 notproduct, \ 2598 manageable, \ 2599 product_rw, \ 2600 lp64_product, \ 2601 range, \ 2602 constraint, \ 2603 writeable) \ 2604 2605 /* 2606 * Macros for factoring of globals 2607 */ 2608 2609 // Interface macros 2610 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2611 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2612 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2613 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2614 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2615 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2616 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2617 #ifdef PRODUCT 2618 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2619 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2620 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2621 #else 2622 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2623 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2624 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2625 #endif // PRODUCT 2626 // Special LP64 flags, product only needed for now. 2627 #ifdef _LP64 2628 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2629 #else 2630 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2631 #endif // _LP64 2632 2633 // Implementation macros 2634 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 2635 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 2636 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 2637 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 2638 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 2639 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 2640 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 2641 #ifdef PRODUCT 2642 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 2643 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 2644 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 2645 #else 2646 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 2647 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 2648 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 2649 #endif // PRODUCT 2650 #ifdef _LP64 2651 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 2652 #else 2653 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 2654 #endif // _LP64 2655 2656 // Only materialize src code for range checking when required, ignore otherwise 2657 #define IGNORE_RANGE(a, b) 2658 // Only materialize src code for contraint checking when required, ignore otherwise 2659 #define IGNORE_CONSTRAINT(func,type) 2660 2661 #define IGNORE_WRITEABLE(type) 2662 2663 VM_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2664 DECLARE_PD_DEVELOPER_FLAG, \ 2665 DECLARE_PRODUCT_FLAG, \ 2666 DECLARE_PD_PRODUCT_FLAG, \ 2667 DECLARE_DIAGNOSTIC_FLAG, \ 2668 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2669 DECLARE_EXPERIMENTAL_FLAG, \ 2670 DECLARE_NOTPRODUCT_FLAG, \ 2671 DECLARE_MANAGEABLE_FLAG, \ 2672 DECLARE_PRODUCT_RW_FLAG, \ 2673 DECLARE_LP64_PRODUCT_FLAG, \ 2674 IGNORE_RANGE, \ 2675 IGNORE_CONSTRAINT, \ 2676 IGNORE_WRITEABLE) 2677 2678 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2679 DECLARE_PD_DEVELOPER_FLAG, \ 2680 DECLARE_PRODUCT_FLAG, \ 2681 DECLARE_PD_PRODUCT_FLAG, \ 2682 DECLARE_DIAGNOSTIC_FLAG, \ 2683 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2684 DECLARE_NOTPRODUCT_FLAG, \ 2685 IGNORE_RANGE, \ 2686 IGNORE_CONSTRAINT, \ 2687 IGNORE_WRITEABLE) 2688 2689 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2690 DECLARE_PRODUCT_FLAG, \ 2691 DECLARE_DIAGNOSTIC_FLAG, \ 2692 DECLARE_EXPERIMENTAL_FLAG, \ 2693 DECLARE_NOTPRODUCT_FLAG, \ 2694 IGNORE_RANGE, \ 2695 IGNORE_CONSTRAINT, \ 2696 IGNORE_WRITEABLE) 2697 2698 // Extensions 2699 2700 #include "runtime/globals_ext.hpp" 2701 2702 #endif // SHARE_RUNTIME_GLOBALS_HPP