1 /*
   2  * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_RUNTIME_GLOBALS_HPP
  26 #define SHARE_RUNTIME_GLOBALS_HPP
  27 
  28 #include "compiler/compiler_globals.hpp"
  29 #include "gc/shared/gc_globals.hpp"
  30 #include "runtime/globals_shared.hpp"
  31 #include "utilities/align.hpp"
  32 #include "utilities/globalDefinitions.hpp"
  33 #include "utilities/macros.hpp"
  34 #include CPU_HEADER(globals)
  35 #include OS_HEADER(globals)
  36 #include OS_CPU_HEADER(globals)
  37 
  38 // develop flags are settable / visible only during development and are constant in the PRODUCT version
  39 // product flags are always settable / visible
  40 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
  41 
  42 // A flag must be declared with one of the following types:
  43 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t.
  44 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used
  45 // only in this file, because the macrology requires single-token type names.
  46 
  47 // Note: Diagnostic options not meant for VM tuning or for product modes.
  48 // They are to be used for VM quality assurance or field diagnosis
  49 // of VM bugs.  They are hidden so that users will not be encouraged to
  50 // try them as if they were VM ordinary execution options.  However, they
  51 // are available in the product version of the VM.  Under instruction
  52 // from support engineers, VM customers can turn them on to collect
  53 // diagnostic information about VM problems.  To use a VM diagnostic
  54 // option, you must first specify +UnlockDiagnosticVMOptions.
  55 // (This master switch also affects the behavior of -Xprintflags.)
  56 //
  57 // experimental flags are in support of features that are not
  58 //    part of the officially supported product, but are available
  59 //    for experimenting with. They could, for example, be performance
  60 //    features that may not have undergone full or rigorous QA, but which may
  61 //    help performance in some cases and released for experimentation
  62 //    by the community of users and developers. This flag also allows one to
  63 //    be able to build a fully supported product that nonetheless also
  64 //    ships with some unsupported, lightly tested, experimental features.
  65 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
  66 //    UnlockExperimentalVMOptions flag, which allows the control and
  67 //    modification of the experimental flags.
  68 //
  69 // Nota bene: neither diagnostic nor experimental options should be used casually,
  70 //    and they are not supported on production loads, except under explicit
  71 //    direction from support engineers.
  72 //
  73 // manageable flags are writeable external product flags.
  74 //    They are dynamically writeable through the JDK management interface
  75 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
  76 //    These flags are external exported interface (see CCC).  The list of
  77 //    manageable flags can be queried programmatically through the management
  78 //    interface.
  79 //
  80 //    A flag can be made as "manageable" only if
  81 //    - the flag is defined in a CCC as an external exported interface.
  82 //    - the VM implementation supports dynamic setting of the flag.
  83 //      This implies that the VM must *always* query the flag variable
  84 //      and not reuse state related to the flag state at any given time.
  85 //    - you want the flag to be queried programmatically by the customers.
  86 //
  87 // product_rw flags are writeable internal product flags.
  88 //    They are like "manageable" flags but for internal/private use.
  89 //    The list of product_rw flags are internal/private flags which
  90 //    may be changed/removed in a future release.  It can be set
  91 //    through the management interface to get/set value
  92 //    when the name of flag is supplied.
  93 //
  94 //    A flag can be made as "product_rw" only if
  95 //    - the VM implementation supports dynamic setting of the flag.
  96 //      This implies that the VM must *always* query the flag variable
  97 //      and not reuse state related to the flag state at any given time.
  98 //
  99 // Note that when there is a need to support develop flags to be writeable,
 100 // it can be done in the same way as product_rw.
 101 //
 102 // range is a macro that will expand to min and max arguments for range
 103 //    checking code if provided - see jvmFlagRangeList.hpp
 104 //
 105 // constraint is a macro that will expand to custom function call
 106 //    for constraint checking if provided - see jvmFlagConstraintList.hpp
 107 
 108 // Default and minimum StringTable and SymbolTable size values
 109 // Must be powers of 2
 110 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536);
 111 const size_t minimumStringTableSize = 128;
 112 const size_t defaultSymbolTableSize = 32768; // 2^15
 113 const size_t minimumSymbolTableSize = 1024;
 114 
 115 #define RUNTIME_FLAGS(develop, \
 116                       develop_pd, \
 117                       product, \
 118                       product_pd, \
 119                       diagnostic, \
 120                       diagnostic_pd, \
 121                       experimental, \
 122                       notproduct, \
 123                       manageable, \
 124                       product_rw, \
 125                       lp64_product, \
 126                       range, \
 127                       constraint) \
 128                                                                             \
 129   lp64_product(bool, UseCompressedOops, false,                              \
 130           "Use 32-bit object references in 64-bit VM. "                     \
 131           "lp64_product means flag is always constant in 32 bit VM")        \
 132                                                                             \
 133   lp64_product(bool, UseCompressedClassPointers, false,                     \
 134           "Use 32-bit class pointers in 64-bit VM. "                        \
 135           "lp64_product means flag is always constant in 32 bit VM")        \
 136                                                                             \
 137   notproduct(bool, CheckCompressedOops, true,                               \
 138           "Generate checks in encoding/decoding code in debug VM")          \
 139                                                                             \
 140   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 141           "Heap allocation steps through preferred address regions to find" \
 142           " where it can allocate the heap. Number of steps to take per "   \
 143           "region.")                                                        \
 144           range(1, max_uintx)                                               \
 145                                                                             \
 146   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 147           "Default object alignment in bytes, 8 is minimum")                \
 148           range(8, 256)                                                     \
 149           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 150                                                                             \
 151   develop(bool, CleanChunkPoolAsync, true,                                  \
 152           "Clean the chunk pool asynchronously")                            \
 153                                                                             \
 154   diagnostic(uint, HandshakeTimeout, 0,                                     \
 155           "If nonzero set a timeout in milliseconds for handshakes")        \
 156                                                                             \
 157   experimental(bool, AlwaysSafeConstructors, false,                         \
 158           "Force safe construction, as if all fields are final.")           \
 159                                                                             \
 160   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 161           "Enable normal processing of flags relating to field diagnostics")\
 162                                                                             \
 163   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 164           "Enable normal processing of flags relating to experimental "     \
 165           "features")                                                       \
 166                                                                             \
 167   product(bool, JavaMonitorsInStackTrace, true,                             \
 168           "Print information about Java monitor locks when the stacks are"  \
 169           "dumped")                                                         \
 170                                                                             \
 171   product_pd(bool, UseLargePages,                                           \
 172           "Use large page memory")                                          \
 173                                                                             \
 174   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 175           "Allocate large pages individually for better affinity")          \
 176                                                                             \
 177   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 178           "Fail large pages individual allocation")                         \
 179                                                                             \
 180   product(bool, UseLargePagesInMetaspace, false,                            \
 181           "(Deprecated) Use large page memory in metaspace. "               \
 182           "Only used if UseLargePages is enabled.")                         \
 183                                                                             \
 184   product(bool, UseNUMA, false,                                             \
 185           "Use NUMA if available")                                          \
 186                                                                             \
 187   product(bool, UseNUMAInterleaving, false,                                 \
 188           "Interleave memory across NUMA nodes if available")               \
 189                                                                             \
 190   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 191           "Granularity to use for NUMA interleaving on Windows OS")         \
 192           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 193                                                                             \
 194   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 195           "Percentage (0-100) used to weight the current sample when "      \
 196           "computing exponentially decaying average for "                   \
 197           "AdaptiveNUMAChunkSizing")                                        \
 198           range(0, 100)                                                     \
 199                                                                             \
 200   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 201           "Do not reallocate more than this amount per collection")         \
 202           range(0, max_uintx)                                               \
 203                                                                             \
 204   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 205           "Enable adaptive chunk sizing for NUMA")                          \
 206                                                                             \
 207   product(bool, NUMAStats, false,                                           \
 208           "Print NUMA stats in detailed heap information")                  \
 209                                                                             \
 210   product(uintx, NUMAPageScanRate, 256,                                     \
 211           "Maximum number of pages to include in the page scan procedure")  \
 212           range(0, max_uintx)                                               \
 213                                                                             \
 214   product(bool, UseAES, false,                                              \
 215           "Control whether AES instructions are used when available")       \
 216                                                                             \
 217   product(bool, UseFMA, false,                                              \
 218           "Control whether FMA instructions are used when available")       \
 219                                                                             \
 220   product(bool, UseSHA, false,                                              \
 221           "Control whether SHA instructions are used when available")       \
 222                                                                             \
 223   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 224           "Use intrinsics for GHASH versions of crypto")                    \
 225                                                                             \
 226   product(bool, UseBASE64Intrinsics, false,                                 \
 227           "Use intrinsics for java.util.Base64")                            \
 228                                                                             \
 229   product(size_t, LargePageSizeInBytes, 0,                                  \
 230           "Large page size (0 to let VM choose the page size)")             \
 231           range(0, max_uintx)                                               \
 232                                                                             \
 233   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 234           "Use large pages if maximum heap is at least this big")           \
 235           range(0, max_uintx)                                               \
 236                                                                             \
 237   product(bool, ForceTimeHighResolution, false,                             \
 238           "Using high time resolution (for Win32 only)")                    \
 239                                                                             \
 240   develop(bool, TracePcPatching, false,                                     \
 241           "Trace usage of frame::patch_pc")                                 \
 242                                                                             \
 243   develop(bool, TraceRelocator, false,                                      \
 244           "Trace the bytecode relocator")                                   \
 245                                                                             \
 246   develop(bool, TraceLongCompiles, false,                                   \
 247           "Print out every time compilation is longer than "                \
 248           "a given threshold")                                              \
 249                                                                             \
 250   diagnostic(bool, SafepointALot, false,                                    \
 251           "Generate a lot of safepoints. This works with "                  \
 252           "GuaranteedSafepointInterval")                                    \
 253                                                                             \
 254   diagnostic(bool, HandshakeALot, false,                                    \
 255           "Generate a lot of handshakes. This works with "                  \
 256           "GuaranteedSafepointInterval")                                    \
 257                                                                             \
 258   product_pd(bool, BackgroundCompilation,                                   \
 259           "A thread requesting compilation is not blocked during "          \
 260           "compilation")                                                    \
 261                                                                             \
 262   product(bool, MethodFlushing, true,                                       \
 263           "Reclamation of zombie and not-entrant methods")                  \
 264                                                                             \
 265   develop(bool, VerifyStack, false,                                         \
 266           "Verify stack of each thread when it is entering a runtime call") \
 267                                                                             \
 268   diagnostic(bool, ForceUnreachable, false,                                 \
 269           "Make all non code cache addresses to be unreachable by "         \
 270           "forcing use of 64bit literal fixups")                            \
 271                                                                             \
 272   notproduct(bool, StressDerivedPointers, false,                            \
 273           "Force scavenge when a derived pointer is detected on stack "     \
 274           "after rtm call")                                                 \
 275                                                                             \
 276   develop(bool, TraceDerivedPointers, false,                                \
 277           "Trace traversal of derived pointers on stack")                   \
 278                                                                             \
 279   notproduct(bool, TraceCodeBlobStacks, false,                              \
 280           "Trace stack-walk of codeblobs")                                  \
 281                                                                             \
 282   notproduct(bool, PrintRewrites, false,                                    \
 283           "Print methods that are being rewritten")                         \
 284                                                                             \
 285   product(bool, UseInlineCaches, true,                                      \
 286           "Use Inline Caches for virtual calls ")                           \
 287                                                                             \
 288   diagnostic(bool, InlineArrayCopy, true,                                   \
 289           "Inline arraycopy native that is known to be part of "            \
 290           "base library DLL")                                               \
 291                                                                             \
 292   diagnostic(bool, InlineObjectHash, true,                                  \
 293           "Inline Object::hashCode() native that is known to be part "      \
 294           "of base library DLL")                                            \
 295                                                                             \
 296   diagnostic(bool, InlineNatives, true,                                     \
 297           "Inline natives that are known to be part of base library DLL")   \
 298                                                                             \
 299   diagnostic(bool, InlineMathNatives, true,                                 \
 300           "Inline SinD, CosD, etc.")                                        \
 301                                                                             \
 302   diagnostic(bool, InlineClassNatives, true,                                \
 303           "Inline Class.isInstance, etc")                                   \
 304                                                                             \
 305   diagnostic(bool, InlineThreadNatives, true,                               \
 306           "Inline Thread.currentThread, etc")                               \
 307                                                                             \
 308   diagnostic(bool, InlineUnsafeOps, true,                                   \
 309           "Inline memory ops (native methods) from Unsafe")                 \
 310                                                                             \
 311   product(bool, CriticalJNINatives, true,                                   \
 312           "Check for critical JNI entry points")                            \
 313                                                                             \
 314   notproduct(bool, StressCriticalJNINatives, false,                         \
 315           "Exercise register saving code in critical natives")              \
 316                                                                             \
 317   diagnostic(bool, UseAESIntrinsics, false,                                 \
 318           "Use intrinsics for AES versions of crypto")                      \
 319                                                                             \
 320   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 321           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 322                                                                             \
 323   diagnostic(bool, UseMD5Intrinsics, false,                                 \
 324           "Use intrinsics for MD5 crypto hash function")                    \
 325                                                                             \
 326   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 327           "Use intrinsics for SHA-1 crypto hash function. "                 \
 328           "Requires that UseSHA is enabled.")                               \
 329                                                                             \
 330   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 331           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 332           "Requires that UseSHA is enabled.")                               \
 333                                                                             \
 334   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 335           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 336           "Requires that UseSHA is enabled.")                               \
 337                                                                             \
 338   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 339           "use intrinsics for java.util.zip.CRC32")                         \
 340                                                                             \
 341   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 342           "use intrinsics for java.util.zip.CRC32C")                        \
 343                                                                             \
 344   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 345           "use intrinsics for java.util.zip.Adler32")                       \
 346                                                                             \
 347   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 348           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 349                                                                             \
 350   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 351          "do not expand intrinsics whose (internal) names appear here")     \
 352                                                                             \
 353   diagnostic(ccstrlist, ControlIntrinsic, "",                               \
 354          "Control intrinsics using a list of +/- (internal) names, "        \
 355          "separated by commas")                                             \
 356                                                                             \
 357   develop(bool, TraceCallFixup, false,                                      \
 358           "Trace all call fixups")                                          \
 359                                                                             \
 360   develop(bool, DeoptimizeALot, false,                                      \
 361           "Deoptimize at every exit from the runtime system")               \
 362                                                                             \
 363   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 364           "A comma separated list of bcis to deoptimize at")                \
 365                                                                             \
 366   develop(bool, DeoptimizeRandom, false,                                    \
 367           "Deoptimize random frames on random exit from the runtime system")\
 368                                                                             \
 369   notproduct(bool, ZombieALot, false,                                       \
 370           "Create zombies (non-entrant) at exit from the runtime system")   \
 371                                                                             \
 372   notproduct(bool, WalkStackALot, false,                                    \
 373           "Trace stack (no print) at every exit from the runtime system")   \
 374                                                                             \
 375   product(bool, Debugging, false,                                           \
 376           "Set when executing debug methods in debug.cpp "                  \
 377           "(to prevent triggering assertions)")                             \
 378                                                                             \
 379   notproduct(bool, VerifyLastFrame, false,                                  \
 380           "Verify oops on last frame on entry to VM")                       \
 381                                                                             \
 382   product(bool, SafepointTimeout, false,                                    \
 383           "Time out and warn or fail after SafepointTimeoutDelay "          \
 384           "milliseconds if failed to reach safepoint")                      \
 385                                                                             \
 386   diagnostic(bool, AbortVMOnSafepointTimeout, false,                        \
 387           "Abort upon failure to reach safepoint (see SafepointTimeout)")   \
 388                                                                             \
 389   diagnostic(bool, AbortVMOnVMOperationTimeout, false,                      \
 390           "Abort upon failure to complete VM operation promptly")           \
 391                                                                             \
 392   diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000,                  \
 393           "Delay in milliseconds for option AbortVMOnVMOperationTimeout")   \
 394           range(0, max_intx)                                                \
 395                                                                             \
 396   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 397   /* typically, at most a few retries are needed                    */      \
 398   product(intx, SuspendRetryCount, 50,                                      \
 399           "Maximum retry count for an external suspend request")            \
 400           range(0, max_intx)                                                \
 401                                                                             \
 402   product(intx, SuspendRetryDelay, 5,                                       \
 403           "Milliseconds to delay per retry (* current_retry_count)")        \
 404           range(0, max_intx)                                                \
 405                                                                             \
 406   product(bool, AssertOnSuspendWaitFailure, false,                          \
 407           "Assert/Guarantee on external suspend wait failure")              \
 408                                                                             \
 409   product(bool, TraceSuspendWaitFailures, false,                            \
 410           "Trace external suspend wait failures")                           \
 411                                                                             \
 412   product(bool, MaxFDLimit, true,                                           \
 413           "Bump the number of file descriptors to maximum (Unix only)")     \
 414                                                                             \
 415   diagnostic(bool, LogEvents, true,                                         \
 416           "Enable the various ring buffer event logs")                      \
 417                                                                             \
 418   diagnostic(uintx, LogEventsBufferEntries, 20,                             \
 419           "Number of ring buffer event logs")                               \
 420           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 421                                                                             \
 422   diagnostic(bool, BytecodeVerificationRemote, true,                        \
 423           "Enable the Java bytecode verifier for remote classes")           \
 424                                                                             \
 425   diagnostic(bool, BytecodeVerificationLocal, false,                        \
 426           "Enable the Java bytecode verifier for local classes")            \
 427                                                                             \
 428   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 429           "Force exceptions on FP stack under/overflow")                    \
 430                                                                             \
 431   develop(bool, VerifyStackAtCalls, false,                                  \
 432           "Verify that the stack pointer is unchanged after calls")         \
 433                                                                             \
 434   develop(bool, TraceJavaAssertions, false,                                 \
 435           "Trace java language assertions")                                 \
 436                                                                             \
 437   notproduct(bool, VerifyCodeCache, false,                                  \
 438           "Verify code cache on memory allocation/deallocation")            \
 439                                                                             \
 440   develop(bool, UseMallocOnly, false,                                       \
 441           "Use only malloc/free for allocation (no resource area/arena)")   \
 442                                                                             \
 443   develop(bool, ZapResourceArea, trueInDebug,                               \
 444           "Zap freed resource/arena space with 0xABABABAB")                 \
 445                                                                             \
 446   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 447           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 448                                                                             \
 449   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 450           "Zap allocated/freed stack segments with 0xFADFADED")             \
 451                                                                             \
 452   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 453           "Zap unused heap space with 0xBAADBABE")                          \
 454                                                                             \
 455   develop(bool, CheckZapUnusedHeapArea, false,                              \
 456           "Check zapping of unused heap space")                             \
 457                                                                             \
 458   develop(bool, ZapFillerObjects, trueInDebug,                              \
 459           "Zap filler objects with 0xDEAFBABE")                             \
 460                                                                             \
 461   develop(bool, PrintVMMessages, true,                                      \
 462           "Print VM messages on console")                                   \
 463                                                                             \
 464   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 465           "If > 0, provokes an error after VM initialization; the value "   \
 466           "determines which error to provoke. See test_error_handler() "    \
 467           "in vmError.cpp.")                                                \
 468                                                                             \
 469   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 470           "If > 0, provokes an error inside VM error handler (a secondary " \
 471           "crash). see test_error_handler() in vmError.cpp")                \
 472                                                                             \
 473   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 474           "If true, tests SafeFetch inside error handler.")                 \
 475                                                                             \
 476   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 477           "If true, simulates an unresponsive error handler.")              \
 478                                                                             \
 479   develop(bool, Verbose, false,                                             \
 480           "Print additional debugging information from other modes")        \
 481                                                                             \
 482   develop(bool, PrintMiscellaneous, false,                                  \
 483           "Print uncategorized debugging information (requires +Verbose)")  \
 484                                                                             \
 485   develop(bool, WizardMode, false,                                          \
 486           "Print much more debugging information")                          \
 487                                                                             \
 488   product(bool, ShowMessageBoxOnError, false,                               \
 489           "Keep process alive on VM fatal error")                           \
 490                                                                             \
 491   product(bool, CreateCoredumpOnCrash, true,                                \
 492           "Create core/mini dump on VM fatal error")                        \
 493                                                                             \
 494   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 495           "Timeout, in seconds, to limit the time spent on writing an "     \
 496           "error log in case of a crash.")                                  \
 497           range(0, (uint64_t)max_jlong/1000)                                \
 498                                                                             \
 499   product_pd(bool, UseOSErrorReporting,                                     \
 500           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 501                                                                             \
 502   product(bool, SuppressFatalErrorMessage, false,                           \
 503           "Report NO fatal error message (avoid deadlock)")                 \
 504                                                                             \
 505   product(ccstrlist, OnError, "",                                           \
 506           "Run user-defined commands on fatal error; see VMError.cpp "      \
 507           "for examples")                                                   \
 508                                                                             \
 509   product(ccstrlist, OnOutOfMemoryError, "",                                \
 510           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 511                                                                             \
 512   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 513           "Dump heap to file before any major stop-the-world GC")           \
 514                                                                             \
 515   manageable(bool, HeapDumpAfterFullGC, false,                              \
 516           "Dump heap to file after any major stop-the-world GC")            \
 517                                                                             \
 518   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 519           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 520                                                                             \
 521   manageable(ccstr, HeapDumpPath, NULL,                                     \
 522           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 523           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 524           "in the working directory)")                                      \
 525                                                                             \
 526   develop(bool, BreakAtWarning, false,                                      \
 527           "Execute breakpoint upon encountering VM warning")                \
 528                                                                             \
 529   product(ccstr, NativeMemoryTracking, "off",                               \
 530           "Native memory tracking options")                                 \
 531                                                                             \
 532   diagnostic(bool, PrintNMTStatistics, false,                               \
 533           "Print native memory tracking summary data if it is on")          \
 534                                                                             \
 535   diagnostic(bool, LogCompilation, false,                                   \
 536           "Log compilation activity in detail to LogFile")                  \
 537                                                                             \
 538   product(bool, PrintCompilation, false,                                    \
 539           "Print compilations")                                             \
 540                                                                             \
 541   diagnostic(intx, RepeatCompilation, 0,                                    \
 542           "Repeat compilation without installing code (number of times)")   \
 543           range(0, max_jint)                                                 \
 544                                                                             \
 545   product(bool, PrintExtendedThreadInfo, false,                             \
 546           "Print more information in thread dump")                          \
 547                                                                             \
 548   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 549           "0: do not allow scavengable oops in the code cache; "            \
 550           "1: allow scavenging from the code cache; "                       \
 551           "2: emit as many constants as the compiler can see")              \
 552           range(0, 2)                                                       \
 553                                                                             \
 554   product(bool, AlwaysRestoreFPU, false,                                    \
 555           "Restore the FPU control word after every JNI call (expensive)")  \
 556                                                                             \
 557   diagnostic(bool, PrintCompilation2, false,                                \
 558           "Print additional statistics per compilation")                    \
 559                                                                             \
 560   diagnostic(bool, PrintAdapterHandlers, false,                             \
 561           "Print code generated for i2c/c2i adapters")                      \
 562                                                                             \
 563   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 564           "Verify that i2c/c2i adapters are called properly")               \
 565                                                                             \
 566   develop(bool, VerifyAdapterSharing, false,                                \
 567           "Verify that the code for shared adapters is the equivalent")     \
 568                                                                             \
 569   diagnostic(bool, PrintAssembly, false,                                    \
 570           "Print assembly code (using external disassembler.so)")           \
 571                                                                             \
 572   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 573           "Print options string passed to disassembler.so")                 \
 574                                                                             \
 575   notproduct(bool, PrintNMethodStatistics, false,                           \
 576           "Print a summary statistic for the generated nmethods")           \
 577                                                                             \
 578   diagnostic(bool, PrintNMethods, false,                                    \
 579           "Print assembly code for nmethods when generated")                \
 580                                                                             \
 581   diagnostic(bool, PrintNativeNMethods, false,                              \
 582           "Print assembly code for native nmethods when generated")         \
 583                                                                             \
 584   develop(bool, PrintDebugInfo, false,                                      \
 585           "Print debug information for all nmethods when generated")        \
 586                                                                             \
 587   develop(bool, PrintRelocations, false,                                    \
 588           "Print relocation information for all nmethods when generated")   \
 589                                                                             \
 590   develop(bool, PrintDependencies, false,                                   \
 591           "Print dependency information for all nmethods when generated")   \
 592                                                                             \
 593   develop(bool, PrintExceptionHandlers, false,                              \
 594           "Print exception handler tables for all nmethods when generated") \
 595                                                                             \
 596   develop(bool, StressCompiledExceptionHandlers, false,                     \
 597           "Exercise compiled exception handlers")                           \
 598                                                                             \
 599   develop(bool, InterceptOSException, false,                                \
 600           "Start debugger when an implicit OS (e.g. NULL) "                 \
 601           "exception happens")                                              \
 602                                                                             \
 603   product(bool, PrintCodeCache, false,                                      \
 604           "Print the code cache memory usage when exiting")                 \
 605                                                                             \
 606   develop(bool, PrintCodeCache2, false,                                     \
 607           "Print detailed usage information on the code cache when exiting")\
 608                                                                             \
 609   product(bool, PrintCodeCacheOnCompilation, false,                         \
 610           "Print the code cache memory usage each time a method is "        \
 611           "compiled")                                                       \
 612                                                                             \
 613   diagnostic(bool, PrintCodeHeapAnalytics, false,                           \
 614           "Print code heap usage statistics on exit and on full condition") \
 615                                                                             \
 616   diagnostic(bool, PrintStubCode, false,                                    \
 617           "Print generated stub code")                                      \
 618                                                                             \
 619   product(bool, StackTraceInThrowable, true,                                \
 620           "Collect backtrace in throwable when exception happens")          \
 621                                                                             \
 622   product(bool, OmitStackTraceInFastThrow, true,                            \
 623           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 624                                                                             \
 625   manageable(bool, ShowCodeDetailsInExceptionMessages, true,                \
 626           "Show exception messages from RuntimeExceptions that contain "    \
 627           "snippets of the failing code. Disable this to improve privacy.") \
 628                                                                             \
 629   product(bool, PrintWarnings, true,                                        \
 630           "Print JVM warnings to output stream")                            \
 631                                                                             \
 632   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 633           "Print warnings for stalled SpinLocks")                           \
 634                                                                             \
 635   product(bool, RegisterFinalizersAtInit, true,                             \
 636           "Register finalizable objects at end of Object.<init> or "        \
 637           "after allocation")                                               \
 638                                                                             \
 639   develop(bool, RegisterReferences, true,                                   \
 640           "Tell whether the VM should register soft/weak/final/phantom "    \
 641           "references")                                                     \
 642                                                                             \
 643   develop(bool, IgnoreRewrites, false,                                      \
 644           "Suppress rewrites of bytecodes in the oopmap generator. "        \
 645           "This is unsafe!")                                                \
 646                                                                             \
 647   develop(bool, PrintCodeCacheExtension, false,                             \
 648           "Print extension of code cache")                                  \
 649                                                                             \
 650   develop(bool, UsePrivilegedStack, true,                                   \
 651           "Enable the security JVM functions")                              \
 652                                                                             \
 653   develop(bool, ProtectionDomainVerification, true,                         \
 654           "Verify protection domain before resolution in system dictionary")\
 655                                                                             \
 656   product(bool, ClassUnloading, true,                                       \
 657           "Do unloading of classes")                                        \
 658                                                                             \
 659   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
 660           "Do unloading of classes with a concurrent marking cycle")        \
 661                                                                             \
 662   develop(bool, DisableStartThread, false,                                  \
 663           "Disable starting of additional Java threads "                    \
 664           "(for debugging only)")                                           \
 665                                                                             \
 666   develop(bool, MemProfiling, false,                                        \
 667           "Write memory usage profiling to log file")                       \
 668                                                                             \
 669   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 670           "Print the system dictionary at exit")                            \
 671                                                                             \
 672   diagnostic(bool, DynamicallyResizeSystemDictionaries, true,               \
 673           "Dynamically resize system dictionaries as needed")               \
 674                                                                             \
 675   product(bool, AlwaysLockClassLoader, false,                               \
 676           "Require the VM to acquire the class loader lock before calling " \
 677           "loadClass() even for class loaders registering "                 \
 678           "as parallel capable")                                            \
 679                                                                             \
 680   product(bool, AllowParallelDefineClass, false,                            \
 681           "Allow parallel defineClass requests for class loaders "          \
 682           "registering as parallel capable")                                \
 683                                                                             \
 684   product_pd(bool, DontYieldALot,                                           \
 685           "Throw away obvious excess yield calls")                          \
 686                                                                             \
 687   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
 688                "Disable the use of stack guard pages if the JVM is loaded " \
 689                "on the primordial process thread")                          \
 690                                                                             \
 691   /* notice: the max range value here is max_jint, not max_intx  */         \
 692   /* because of overflow issue                                   */         \
 693   diagnostic(intx, AsyncDeflationInterval, 250,                             \
 694           "Async deflate idle monitors every so many milliseconds when "    \
 695           "MonitorUsedDeflationThreshold is exceeded (0 is off).")          \
 696           range(0, max_jint)                                                \
 697                                                                             \
 698   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
 699           "Percentage of used monitors before triggering deflation (0 is "  \
 700           "off). The check is performed on GuaranteedSafepointInterval "    \
 701           "or AsyncDeflationInterval.")                                     \
 702           range(0, 100)                                                     \
 703                                                                             \
 704   experimental(intx, hashCode, 5,                                           \
 705                "(Unstable) select hashCode generation algorithm")           \
 706                                                                             \
 707   product(bool, FilterSpuriousWakeups, true,                                \
 708           "When true prevents OS-level spurious, or premature, wakeups "    \
 709           "from Object.wait (Ignored for Windows)")                         \
 710                                                                             \
 711   product(bool, ReduceSignalUsage, false,                                   \
 712           "Reduce the use of OS signals in Java and/or the VM")             \
 713                                                                             \
 714   develop(bool, LoadLineNumberTables, true,                                 \
 715           "Tell whether the class file parser loads line number tables")    \
 716                                                                             \
 717   develop(bool, LoadLocalVariableTables, true,                              \
 718           "Tell whether the class file parser loads local variable tables") \
 719                                                                             \
 720   develop(bool, LoadLocalVariableTypeTables, true,                          \
 721           "Tell whether the class file parser loads local variable type"    \
 722           "tables")                                                         \
 723                                                                             \
 724   product(bool, AllowUserSignalHandlers, false,                             \
 725           "Do not complain if the application installs signal handlers "    \
 726           "(Unix only)")                                                    \
 727                                                                             \
 728   product(bool, UseSignalChaining, true,                                    \
 729           "Use signal-chaining to invoke signal handlers installed "        \
 730           "by the application (Unix only)")                                 \
 731                                                                             \
 732   product(bool, RestoreMXCSROnJNICalls, false,                              \
 733           "Restore MXCSR when returning from JNI calls")                    \
 734                                                                             \
 735   product(bool, CheckJNICalls, false,                                       \
 736           "Verify all arguments to JNI calls")                              \
 737                                                                             \
 738   product(bool, UseFastJNIAccessors, true,                                  \
 739           "Use optimized versions of Get<Primitive>Field")                  \
 740                                                                             \
 741   product(intx, MaxJNILocalCapacity, 65536,                                 \
 742           "Maximum allowable local JNI handle capacity to "                 \
 743           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
 744           "where <= 0 is unlimited, default: 65536")                        \
 745           range(min_intx, max_intx)                                         \
 746                                                                             \
 747   product(bool, EagerXrunInit, false,                                       \
 748           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 749           "but not all -Xrun libraries may support the state of the VM "    \
 750           "at this time")                                                   \
 751                                                                             \
 752   product(bool, PreserveAllAnnotations, false,                              \
 753           "Preserve RuntimeInvisibleAnnotations as well "                   \
 754           "as RuntimeVisibleAnnotations")                                   \
 755                                                                             \
 756   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 757           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 758                                                                             \
 759   product(bool, UseXMMForArrayCopy, false,                                  \
 760           "Use SSE2 MOVQ instruction for Arraycopy")                        \
 761                                                                             \
 762   notproduct(bool, PrintFieldLayout, false,                                 \
 763           "Print field layout for each class")                              \
 764                                                                             \
 765   /* Need to limit the extent of the padding to reasonable size.          */\
 766   /* 8K is well beyond the reasonable HW cache line size, even with       */\
 767   /* aggressive prefetching, while still leaving the room for segregating */\
 768   /* among the distinct pages.                                            */\
 769   product(intx, ContendedPaddingWidth, 128,                                 \
 770           "How many bytes to pad the fields/classes marked @Contended with")\
 771           range(0, 8192)                                                    \
 772           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
 773                                                                             \
 774   product(bool, EnableContended, true,                                      \
 775           "Enable @Contended annotation support")                           \
 776                                                                             \
 777   product(bool, RestrictContended, true,                                    \
 778           "Restrict @Contended to trusted classes")                         \
 779                                                                             \
 780   product(bool, UseBiasedLocking, false,                                    \
 781           "(Deprecated) Enable biased locking in JVM")                      \
 782                                                                             \
 783   product(intx, BiasedLockingStartupDelay, 0,                               \
 784           "(Deprecated) Number of milliseconds to wait before enabling "    \
 785           "biased locking")                                                 \
 786           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
 787           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
 788                                                                             \
 789   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
 790           "(Deprecated) Print statistics of biased locking in JVM")         \
 791                                                                             \
 792   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
 793           "(Deprecated) Threshold of number of revocations per type to "    \
 794           "try to rebias all objects in the heap of that type")             \
 795           range(0, max_intx)                                                \
 796           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
 797                                                                             \
 798   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
 799           "(Deprecated) Threshold of number of revocations per type to "    \
 800           "permanently revoke biases of all objects in the heap of that "   \
 801           "type")                                                           \
 802           range(0, max_intx)                                                \
 803           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
 804                                                                             \
 805   product(intx, BiasedLockingDecayTime, 25000,                              \
 806           "(Deprecated) Decay time (in milliseconds) to re-enable bulk "    \
 807           "rebiasing of a type after previous bulk rebias")                 \
 808           range(500, max_intx)                                              \
 809           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
 810                                                                             \
 811   product(bool, ExitOnOutOfMemoryError, false,                              \
 812           "JVM exits on the first occurrence of an out-of-memory error")    \
 813                                                                             \
 814   product(bool, CrashOnOutOfMemoryError, false,                             \
 815           "JVM aborts, producing an error log and core/mini dump, on the "  \
 816           "first occurrence of an out-of-memory error")                     \
 817                                                                             \
 818   /* tracing */                                                             \
 819                                                                             \
 820   develop(bool, StressRewriter, false,                                      \
 821           "Stress linktime bytecode rewriting")                             \
 822                                                                             \
 823   product(ccstr, TraceJVMTI, NULL,                                          \
 824           "Trace flags for JVMTI functions and events")                     \
 825                                                                             \
 826   /* This option can change an EMCP method into an obsolete method. */      \
 827   /* This can affect tests that except specific methods to be EMCP. */      \
 828   /* This option should be used with caution.                       */      \
 829   product(bool, StressLdcRewrite, false,                                    \
 830           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
 831                                                                             \
 832   /* change to false by default sometime after Mustang */                   \
 833   product(bool, VerifyMergedCPBytecodes, true,                              \
 834           "Verify bytecodes after RedefineClasses constant pool merging")   \
 835                                                                             \
 836   product(bool, AllowRedefinitionToAddDeleteMethods, false,                 \
 837           "(Deprecated) Allow redefinition to add and delete private "      \
 838           "static or final methods for compatibility with old releases")    \
 839                                                                             \
 840   develop(bool, TraceBytecodes, false,                                      \
 841           "Trace bytecode execution")                                       \
 842                                                                             \
 843   develop(bool, TraceICs, false,                                            \
 844           "Trace inline cache changes")                                     \
 845                                                                             \
 846   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
 847           "Trace method invocation counter overflow")                       \
 848                                                                             \
 849   develop(bool, TraceInlineCacheClearing, false,                            \
 850           "Trace clearing of inline caches in nmethods")                    \
 851                                                                             \
 852   develop(bool, TraceDependencies, false,                                   \
 853           "Trace dependencies")                                             \
 854                                                                             \
 855   develop(bool, VerifyDependencies, trueInDebug,                            \
 856           "Exercise and verify the compilation dependency mechanism")       \
 857                                                                             \
 858   develop(bool, TraceNewOopMapGeneration, false,                            \
 859           "Trace OopMapGeneration")                                         \
 860                                                                             \
 861   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
 862           "Trace OopMapGeneration: print detailed cell states")             \
 863                                                                             \
 864   develop(bool, TimeOopMap, false,                                          \
 865           "Time calls to GenerateOopMap::compute_map() in sum")             \
 866                                                                             \
 867   develop(bool, TimeOopMap2, false,                                         \
 868           "Time calls to GenerateOopMap::compute_map() individually")       \
 869                                                                             \
 870   develop(bool, TraceOopMapRewrites, false,                                 \
 871           "Trace rewriting of methods during oop map generation")           \
 872                                                                             \
 873   develop(bool, TraceICBuffer, false,                                       \
 874           "Trace usage of IC buffer")                                       \
 875                                                                             \
 876   develop(bool, TraceCompiledIC, false,                                     \
 877           "Trace changes of compiled IC")                                   \
 878                                                                             \
 879   develop(bool, FLSVerifyDictionary, false,                                 \
 880           "Do lots of (expensive) FLS dictionary verification")             \
 881                                                                             \
 882                                                                             \
 883   notproduct(bool, CheckMemoryInitialization, false,                        \
 884           "Check memory initialization")                                    \
 885                                                                             \
 886   product(uintx, ProcessDistributionStride, 4,                              \
 887           "Stride through processors when distributing processes")          \
 888           range(0, max_juint)                                               \
 889                                                                             \
 890   develop(bool, TraceFinalizerRegistration, false,                          \
 891           "Trace registration of final references")                         \
 892                                                                             \
 893   product(bool, IgnoreEmptyClassPaths, false,                               \
 894           "Ignore empty path elements in -classpath")                       \
 895                                                                             \
 896   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
 897           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
 898           "(Deprecated) Initial size of the boot class loader data metaspace") \
 899           range(30*K, max_uintx/BytesPerWord)                               \
 900           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
 901                                                                             \
 902   product(bool, PrintHeapAtSIGBREAK, true,                                  \
 903           "Print heap layout in response to SIGBREAK")                      \
 904                                                                             \
 905   manageable(bool, PrintClassHistogram, false,                              \
 906           "Print a histogram of class instances")                           \
 907                                                                             \
 908   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
 909           "The percentage of the used heap that the instances of a class "  \
 910           "must occupy for the class to generate a trace event")            \
 911           range(0.0, 100.0)                                                 \
 912                                                                             \
 913   /* JVMTI heap profiling */                                                \
 914                                                                             \
 915   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
 916           "Trace JVMTI object tagging calls")                               \
 917                                                                             \
 918   diagnostic(bool, VerifyBeforeIteration, false,                            \
 919           "Verify memory system before JVMTI iteration")                    \
 920                                                                             \
 921   /* compiler interface */                                                  \
 922                                                                             \
 923   develop(bool, CIPrintCompilerName, false,                                 \
 924           "when CIPrint is active, print the name of the active compiler")  \
 925                                                                             \
 926   diagnostic(bool, CIPrintCompileQueue, false,                              \
 927           "display the contents of the compile queue whenever a "           \
 928           "compilation is enqueued")                                        \
 929                                                                             \
 930   develop(bool, CIPrintRequests, false,                                     \
 931           "display every request for compilation")                          \
 932                                                                             \
 933   product(bool, CITime, false,                                              \
 934           "collect timing information for compilation")                     \
 935                                                                             \
 936   develop(bool, CITimeVerbose, false,                                       \
 937           "be more verbose in compilation timings")                         \
 938                                                                             \
 939   develop(bool, CITimeEach, false,                                          \
 940           "display timing information after each successful compilation")   \
 941                                                                             \
 942   develop(bool, CICountOSR, false,                                          \
 943           "use a separate counter when assigning ids to osr compilations")  \
 944                                                                             \
 945   develop(bool, CICompileNatives, true,                                     \
 946           "compile native methods if supported by the compiler")            \
 947                                                                             \
 948   develop_pd(bool, CICompileOSR,                                            \
 949           "compile on stack replacement methods if supported by the "       \
 950           "compiler")                                                       \
 951                                                                             \
 952   develop(bool, CIPrintMethodCodes, false,                                  \
 953           "print method bytecodes of the compiled code")                    \
 954                                                                             \
 955   develop(bool, CIPrintTypeFlow, false,                                     \
 956           "print the results of ciTypeFlow analysis")                       \
 957                                                                             \
 958   develop(bool, CITraceTypeFlow, false,                                     \
 959           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
 960                                                                             \
 961   develop(intx, OSROnlyBCI, -1,                                             \
 962           "OSR only at this bci.  Negative values mean exclude that bci")   \
 963                                                                             \
 964   /* compiler */                                                            \
 965                                                                             \
 966   /* notice: the max range value here is max_jint, not max_intx  */         \
 967   /* because of overflow issue                                   */         \
 968   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
 969           "Number of compiler threads to run")                              \
 970           range(0, max_jint)                                                \
 971           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
 972                                                                             \
 973   product(bool, UseDynamicNumberOfCompilerThreads, true,                    \
 974           "Dynamically choose the number of parallel compiler threads")     \
 975                                                                             \
 976   diagnostic(bool, ReduceNumberOfCompilerThreads, true,                     \
 977              "Reduce the number of parallel compiler threads when they "    \
 978              "are not used")                                                \
 979                                                                             \
 980   diagnostic(bool, TraceCompilerThreads, false,                             \
 981              "Trace creation and removal of compiler threads")              \
 982                                                                             \
 983   develop(bool, InjectCompilerCreationFailure, false,                       \
 984           "Inject thread creation failures for "                            \
 985           "UseDynamicNumberOfCompilerThreads")                              \
 986                                                                             \
 987   develop(bool, UseStackBanging, true,                                      \
 988           "use stack banging for stack overflow checks (required for "      \
 989           "proper StackOverflow handling; disable only to measure cost "    \
 990           "of stackbanging)")                                               \
 991                                                                             \
 992   develop(bool, GenerateSynchronizationCode, true,                          \
 993           "generate locking/unlocking code for synchronized methods and "   \
 994           "monitors")                                                       \
 995                                                                             \
 996   develop(bool, GenerateRangeChecks, true,                                  \
 997           "Generate range checks for array accesses")                       \
 998                                                                             \
 999   diagnostic_pd(bool, ImplicitNullChecks,                                   \
1000           "Generate code for implicit null checks")                         \
1001                                                                             \
1002   product_pd(bool, TrapBasedNullChecks,                                     \
1003           "Generate code for null checks that uses a cmp and trap "         \
1004           "instruction raising SIGTRAP.  This is only used if an access to" \
1005           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
1006           "ImplicitNullChecks don't work (PPC64).")                         \
1007                                                                             \
1008   diagnostic(bool, EnableThreadSMRExtraValidityChecks, true,                \
1009              "Enable Thread SMR extra validity checks")                     \
1010                                                                             \
1011   diagnostic(bool, EnableThreadSMRStatistics, trueInDebug,                  \
1012              "Enable Thread SMR Statistics")                                \
1013                                                                             \
1014   product(bool, UseNotificationThread, true,                                \
1015           "Use Notification Thread")                                        \
1016                                                                             \
1017   product(bool, Inline, true,                                               \
1018           "Enable inlining")                                                \
1019                                                                             \
1020   product(bool, ClipInlining, true,                                         \
1021           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
1022                                                                             \
1023   develop(bool, UseCHA, true,                                               \
1024           "Enable CHA")                                                     \
1025                                                                             \
1026   product(bool, UseTypeProfile, true,                                       \
1027           "Check interpreter profile for historically monomorphic calls")   \
1028                                                                             \
1029   diagnostic(bool, PrintInlining, false,                                    \
1030           "Print inlining optimizations")                                   \
1031                                                                             \
1032   product(bool, UsePopCountInstruction, false,                              \
1033           "Use population count instruction")                               \
1034                                                                             \
1035   develop(bool, EagerInitialization, false,                                 \
1036           "Eagerly initialize classes if possible")                         \
1037                                                                             \
1038   diagnostic(bool, LogTouchedMethods, false,                                \
1039           "Log methods which have been ever touched in runtime")            \
1040                                                                             \
1041   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
1042           "Print all methods that have been ever touched in runtime")       \
1043                                                                             \
1044   develop(bool, TraceMethodReplacement, false,                              \
1045           "Print when methods are replaced do to recompilation")            \
1046                                                                             \
1047   develop(bool, PrintMethodFlushing, false,                                 \
1048           "Print the nmethods being flushed")                               \
1049                                                                             \
1050   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
1051           "print statistics about method flushing")                         \
1052                                                                             \
1053   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
1054           "Number of compiled code invocations after which "                \
1055           "the method is considered as hot by the flusher")                 \
1056           range(1, max_jint)                                                \
1057                                                                             \
1058   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
1059           "Minimum number of sweeper passes before an nmethod "             \
1060           "can be flushed")                                                 \
1061           range(0, max_intx)                                                \
1062                                                                             \
1063   product(bool, UseCodeAging, true,                                         \
1064           "Insert counter to detect warm methods")                          \
1065                                                                             \
1066   diagnostic(bool, StressCodeAging, false,                                  \
1067           "Start with counters compiled in")                                \
1068                                                                             \
1069   develop(bool, StressCodeBuffers, false,                                   \
1070           "Exercise code buffer expansion and other rare state changes")    \
1071                                                                             \
1072   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
1073           "Generate extra debugging information for non-safepoints in "     \
1074           "nmethods")                                                       \
1075                                                                             \
1076   product(bool, PrintVMOptions, false,                                      \
1077           "Print flags that appeared on the command line")                  \
1078                                                                             \
1079   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
1080           "Ignore unrecognized VM options")                                 \
1081                                                                             \
1082   product(bool, PrintCommandLineFlags, false,                               \
1083           "Print flags specified on command line or set by ergonomics")     \
1084                                                                             \
1085   product(bool, PrintFlagsInitial, false,                                   \
1086           "Print all VM flags before argument processing and exit VM")      \
1087                                                                             \
1088   product(bool, PrintFlagsFinal, false,                                     \
1089           "Print all VM flags after argument and ergonomic processing")     \
1090                                                                             \
1091   notproduct(bool, PrintFlagsWithComments, false,                           \
1092           "Print all VM flags with default values and descriptions and "    \
1093           "exit")                                                           \
1094                                                                             \
1095   product(bool, PrintFlagsRanges, false,                                    \
1096           "Print VM flags and their ranges")                                \
1097                                                                             \
1098   diagnostic(bool, SerializeVMOutput, true,                                 \
1099           "Use a mutex to serialize output to tty and LogFile")             \
1100                                                                             \
1101   diagnostic(bool, DisplayVMOutput, true,                                   \
1102           "Display all VM output on the tty, independently of LogVMOutput") \
1103                                                                             \
1104   diagnostic(bool, LogVMOutput, false,                                      \
1105           "Save VM output to LogFile")                                      \
1106                                                                             \
1107   diagnostic(ccstr, LogFile, NULL,                                          \
1108           "If LogVMOutput or LogCompilation is on, save VM output to "      \
1109           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1110                                                                             \
1111   product(ccstr, ErrorFile, NULL,                                           \
1112           "If an error occurs, save the error data to this file "           \
1113           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
1114                                                                             \
1115   product(bool, ExtensiveErrorReports,                                      \
1116           PRODUCT_ONLY(false) NOT_PRODUCT(true),                            \
1117           "Error reports are more extensive.")                              \
1118                                                                             \
1119   product(bool, DisplayVMOutputToStderr, false,                             \
1120           "If DisplayVMOutput is true, display all VM output to stderr")    \
1121                                                                             \
1122   product(bool, DisplayVMOutputToStdout, false,                             \
1123           "If DisplayVMOutput is true, display all VM output to stdout")    \
1124                                                                             \
1125   product(bool, ErrorFileToStderr, false,                                   \
1126           "If true, error data is printed to stderr instead of a file")     \
1127                                                                             \
1128   product(bool, ErrorFileToStdout, false,                                   \
1129           "If true, error data is printed to stdout instead of a file")     \
1130                                                                             \
1131   product(bool, UseHeavyMonitors, false,                                    \
1132           "use heavyweight instead of lightweight Java monitors")           \
1133                                                                             \
1134   product(bool, PrintStringTableStatistics, false,                          \
1135           "print statistics about the StringTable and SymbolTable")         \
1136                                                                             \
1137   diagnostic(bool, VerifyStringTableAtExit, false,                          \
1138           "verify StringTable contents at exit")                            \
1139                                                                             \
1140   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
1141           "print histogram of the symbol table")                            \
1142                                                                             \
1143   notproduct(bool, ExitVMOnVerifyError, false,                              \
1144           "standard exit from VM if bytecode verify error "                 \
1145           "(only in debug mode)")                                           \
1146                                                                             \
1147   diagnostic(ccstr, AbortVMOnException, NULL,                               \
1148           "Call fatal if this exception is thrown.  Example: "              \
1149           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1150                                                                             \
1151   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
1152           "Call fatal if the exception pointed by AbortVMOnException "      \
1153           "has this message")                                               \
1154                                                                             \
1155   develop(bool, DebugVtables, false,                                        \
1156           "add debugging code to vtable dispatch")                          \
1157                                                                             \
1158   notproduct(bool, PrintVtableStats, false,                                 \
1159           "print vtables stats at end of run")                              \
1160                                                                             \
1161   develop(bool, TraceCreateZombies, false,                                  \
1162           "trace creation of zombie nmethods")                              \
1163                                                                             \
1164   product(bool, RangeCheckElimination, true,                                \
1165           "Eliminate range checks")                                         \
1166                                                                             \
1167   develop_pd(bool, UncommonNullCast,                                        \
1168           "track occurrences of null in casts; adjust compiler tactics")    \
1169                                                                             \
1170   develop(bool, TypeProfileCasts,  true,                                    \
1171           "treat casts like calls for purposes of type profiling")          \
1172                                                                             \
1173   develop(bool, TraceLivenessGen, false,                                    \
1174           "Trace the generation of liveness analysis information")          \
1175                                                                             \
1176   notproduct(bool, TraceLivenessQuery, false,                               \
1177           "Trace queries of liveness analysis information")                 \
1178                                                                             \
1179   notproduct(bool, CollectIndexSetStatistics, false,                        \
1180           "Collect information about IndexSets")                            \
1181                                                                             \
1182   develop(bool, UseLoopSafepoints, true,                                    \
1183           "Generate Safepoint nodes in every loop")                         \
1184                                                                             \
1185   develop(intx, FastAllocateSizeLimit, 128*K,                               \
1186           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
1187           "Inline allocations larger than this in doublewords must go slow")\
1188                                                                             \
1189   product_pd(bool, CompactStrings,                                          \
1190           "Enable Strings to use single byte chars in backing store")       \
1191                                                                             \
1192   product_pd(uintx, TypeProfileLevel,                                       \
1193           "=XYZ, with Z: Type profiling of arguments at call; "             \
1194                      "Y: Type profiling of return value at call; "          \
1195                      "X: Type profiling of parameters to methods; "         \
1196           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
1197           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
1198                                                                             \
1199   product(intx, TypeProfileArgsLimit,     2,                                \
1200           "max number of call arguments to consider for type profiling")    \
1201           range(0, 16)                                                      \
1202                                                                             \
1203   product(intx, TypeProfileParmsLimit,    2,                                \
1204           "max number of incoming parameters to consider for type profiling"\
1205           ", -1 for all")                                                   \
1206           range(-1, 64)                                                     \
1207                                                                             \
1208   /* statistics */                                                          \
1209   develop(bool, CountCompiledCalls, false,                                  \
1210           "Count method invocations")                                       \
1211                                                                             \
1212   notproduct(bool, CountRuntimeCalls, false,                                \
1213           "Count VM runtime calls")                                         \
1214                                                                             \
1215   develop(bool, CountJNICalls, false,                                       \
1216           "Count jni method invocations")                                   \
1217                                                                             \
1218   notproduct(bool, CountJVMCalls, false,                                    \
1219           "Count jvm method invocations")                                   \
1220                                                                             \
1221   notproduct(bool, CountRemovableExceptions, false,                         \
1222           "Count exceptions that could be replaced by branches due to "     \
1223           "inlining")                                                       \
1224                                                                             \
1225   notproduct(bool, ICMissHistogram, false,                                  \
1226           "Produce histogram of IC misses")                                 \
1227                                                                             \
1228   /* interpreter */                                                         \
1229   product_pd(bool, RewriteBytecodes,                                        \
1230           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
1231                                                                             \
1232   product_pd(bool, RewriteFrequentPairs,                                    \
1233           "Rewrite frequently used bytecode pairs into a single bytecode")  \
1234                                                                             \
1235   diagnostic(bool, PrintInterpreter, false,                                 \
1236           "Print the generated interpreter code")                           \
1237                                                                             \
1238   product(bool, UseInterpreter, true,                                       \
1239           "Use interpreter for non-compiled methods")                       \
1240                                                                             \
1241   develop(bool, UseFastSignatureHandlers, true,                             \
1242           "Use fast signature handlers for native calls")                   \
1243                                                                             \
1244   product(bool, UseLoopCounter, true,                                       \
1245           "Increment invocation counter on backward branch")                \
1246                                                                             \
1247   product_pd(bool, UseOnStackReplacement,                                   \
1248           "Use on stack replacement, calls runtime if invoc. counter "      \
1249           "overflows in loop")                                              \
1250                                                                             \
1251   notproduct(bool, TraceOnStackReplacement, false,                          \
1252           "Trace on stack replacement")                                     \
1253                                                                             \
1254   product_pd(bool, PreferInterpreterNativeStubs,                            \
1255           "Use always interpreter stubs for native methods invoked via "    \
1256           "interpreter")                                                    \
1257                                                                             \
1258   develop(bool, CountBytecodes, false,                                      \
1259           "Count number of bytecodes executed")                             \
1260                                                                             \
1261   develop(bool, PrintBytecodeHistogram, false,                              \
1262           "Print histogram of the executed bytecodes")                      \
1263                                                                             \
1264   develop(bool, PrintBytecodePairHistogram, false,                          \
1265           "Print histogram of the executed bytecode pairs")                 \
1266                                                                             \
1267   diagnostic(bool, PrintSignatureHandlers, false,                           \
1268           "Print code generated for native method signature handlers")      \
1269                                                                             \
1270   develop(bool, VerifyOops, false,                                          \
1271           "Do plausibility checks for oops")                                \
1272                                                                             \
1273   develop(bool, CheckUnhandledOops, false,                                  \
1274           "Check for unhandled oops in VM code")                            \
1275                                                                             \
1276   develop(bool, VerifyJNIFields, trueInDebug,                               \
1277           "Verify jfieldIDs for instance fields")                           \
1278                                                                             \
1279   notproduct(bool, VerifyJNIEnvThread, false,                               \
1280           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
1281           "from JNI")                                                       \
1282                                                                             \
1283   develop(bool, VerifyFPU, false,                                           \
1284           "Verify FPU state (check for NaN's, etc.)")                       \
1285                                                                             \
1286   develop(bool, VerifyThread, false,                                        \
1287           "Watch the thread register for corruption (SPARC only)")          \
1288                                                                             \
1289   develop(bool, VerifyActivationFrameSize, false,                           \
1290           "Verify that activation frame didn't become smaller than its "    \
1291           "minimal size")                                                   \
1292                                                                             \
1293   develop(bool, TraceFrequencyInlining, false,                              \
1294           "Trace frequency based inlining")                                 \
1295                                                                             \
1296   develop_pd(bool, InlineIntrinsics,                                        \
1297           "Inline intrinsics that can be statically resolved")              \
1298                                                                             \
1299   product_pd(bool, ProfileInterpreter,                                      \
1300           "Profile at the bytecode level during interpretation")            \
1301                                                                             \
1302   develop(bool, TraceProfileInterpreter, false,                             \
1303           "Trace profiling at the bytecode level during interpretation. "   \
1304           "This outputs the profiling information collected to improve "    \
1305           "jit compilation.")                                               \
1306                                                                             \
1307   develop_pd(bool, ProfileTraps,                                            \
1308           "Profile deoptimization traps at the bytecode level")             \
1309                                                                             \
1310   product(intx, ProfileMaturityPercentage, 20,                              \
1311           "number of method invocations/branches (expressed as % of "       \
1312           "CompileThreshold) before using the method's profile")            \
1313           range(0, 100)                                                     \
1314                                                                             \
1315   diagnostic(bool, PrintMethodData, false,                                  \
1316           "Print the results of +ProfileInterpreter at end of run")         \
1317                                                                             \
1318   develop(bool, VerifyDataPointer, trueInDebug,                             \
1319           "Verify the method data pointer during interpreter profiling")    \
1320                                                                             \
1321   develop(bool, VerifyCompiledCode, false,                                  \
1322           "Include miscellaneous runtime verifications in nmethod code; "   \
1323           "default off because it disturbs nmethod size heuristics")        \
1324                                                                             \
1325   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
1326           "Manually make GC thread crash then dump java stack trace;  "     \
1327           "Test only")                                                      \
1328                                                                             \
1329   /* compilation */                                                         \
1330   product(bool, UseCompiler, true,                                          \
1331           "Use Just-In-Time compilation")                                   \
1332                                                                             \
1333   product(bool, UseCounterDecay, true,                                      \
1334           "Adjust recompilation counters")                                  \
1335                                                                             \
1336   develop(intx, CounterHalfLifeTime,    30,                                 \
1337           "Half-life time of invocation counters (in seconds)")             \
1338                                                                             \
1339   develop(intx, CounterDecayMinIntervalLength,   500,                       \
1340           "The minimum interval (in milliseconds) between invocation of "   \
1341           "CounterDecay")                                                   \
1342                                                                             \
1343   product(bool, AlwaysCompileLoopMethods, false,                            \
1344           "When using recompilation, never interpret methods "              \
1345           "containing loops")                                               \
1346                                                                             \
1347   product(bool, DontCompileHugeMethods, true,                               \
1348           "Do not compile methods > HugeMethodLimit")                       \
1349                                                                             \
1350   /* Bytecode escape analysis estimation. */                                \
1351   product(bool, EstimateArgEscape, true,                                    \
1352           "Analyze bytecodes to estimate escape state of arguments")        \
1353                                                                             \
1354   product(intx, BCEATraceLevel, 0,                                          \
1355           "How much tracing to do of bytecode escape analysis estimates "   \
1356           "(0-3)")                                                          \
1357           range(0, 3)                                                       \
1358                                                                             \
1359   product(intx, MaxBCEAEstimateLevel, 5,                                    \
1360           "Maximum number of nested calls that are analyzed by BC EA")      \
1361           range(0, max_jint)                                                \
1362                                                                             \
1363   product(intx, MaxBCEAEstimateSize, 150,                                   \
1364           "Maximum bytecode size of a method to be analyzed by BC EA")      \
1365           range(0, max_jint)                                                \
1366                                                                             \
1367   product(intx,  AllocatePrefetchStyle, 1,                                  \
1368           "0 = no prefetch, "                                               \
1369           "1 = generate prefetch instructions for each allocation, "        \
1370           "2 = use TLAB watermark to gate allocation prefetch, "            \
1371           "3 = generate one prefetch instruction per cache line")           \
1372           range(0, 3)                                                       \
1373                                                                             \
1374   product(intx,  AllocatePrefetchDistance, -1,                              \
1375           "Distance to prefetch ahead of allocation pointer. "              \
1376           "-1: use system-specific value (automatically determined")        \
1377           constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\
1378                                                                             \
1379   product(intx,  AllocatePrefetchLines, 3,                                  \
1380           "Number of lines to prefetch ahead of array allocation pointer")  \
1381           range(1, 64)                                                      \
1382                                                                             \
1383   product(intx,  AllocateInstancePrefetchLines, 1,                          \
1384           "Number of lines to prefetch ahead of instance allocation "       \
1385           "pointer")                                                        \
1386           range(1, 64)                                                      \
1387                                                                             \
1388   product(intx,  AllocatePrefetchStepSize, 16,                              \
1389           "Step size in bytes of sequential prefetch instructions")         \
1390           range(1, 512)                                                     \
1391           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1392                                                                             \
1393   product(intx,  AllocatePrefetchInstr, 0,                                  \
1394           "Select instruction to prefetch ahead of allocation pointer")     \
1395           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
1396                                                                             \
1397   /* deoptimization */                                                      \
1398   develop(bool, TraceDeoptimization, false,                                 \
1399           "Trace deoptimization")                                           \
1400                                                                             \
1401   develop(bool, PrintDeoptimizationDetails, false,                          \
1402           "Print more information about deoptimization")                    \
1403                                                                             \
1404   develop(bool, DebugDeoptimization, false,                                 \
1405           "Tracing various information while debugging deoptimization")     \
1406                                                                             \
1407   product(intx, SelfDestructTimer, 0,                                       \
1408           "Will cause VM to terminate after a given time (in minutes) "     \
1409           "(0 means off)")                                                  \
1410           range(0, max_intx)                                                \
1411                                                                             \
1412   product(intx, MaxJavaStackTraceDepth, 1024,                               \
1413           "The maximum number of lines in the stack trace for Java "        \
1414           "exceptions (0 means all)")                                       \
1415           range(0, max_jint/2)                                              \
1416                                                                             \
1417   /* notice: the max range value here is max_jint, not max_intx  */         \
1418   /* because of overflow issue                                   */         \
1419   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
1420           "Guarantee a safepoint (at least) every so many milliseconds "    \
1421           "(0 means none)")                                                 \
1422           range(0, max_jint)                                                \
1423                                                                             \
1424   product(intx, SafepointTimeoutDelay, 10000,                               \
1425           "Delay in milliseconds for option SafepointTimeout")              \
1426   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
1427   NOT_LP64(range(0, max_intx))                                              \
1428                                                                             \
1429   product(intx, NmethodSweepActivity, 10,                                   \
1430           "Removes cold nmethods from code cache if > 0. Higher values "    \
1431           "result in more aggressive sweeping")                             \
1432           range(0, 2000)                                                    \
1433                                                                             \
1434   notproduct(bool, LogSweeper, false,                                       \
1435           "Keep a ring buffer of sweeper activity")                         \
1436                                                                             \
1437   notproduct(intx, SweeperLogEntries, 1024,                                 \
1438           "Number of records in the ring buffer of sweeper activity")       \
1439                                                                             \
1440   notproduct(intx, MemProfilingInterval, 500,                               \
1441           "Time between each invocation of the MemProfiler")                \
1442                                                                             \
1443   develop(intx, MallocCatchPtr, -1,                                         \
1444           "Hit breakpoint when mallocing/freeing this pointer")             \
1445                                                                             \
1446   notproduct(ccstrlist, SuppressErrorAt, "",                                \
1447           "List of assertions (file:line) to muzzle")                       \
1448                                                                             \
1449   develop(intx, StackPrintLimit, 100,                                       \
1450           "number of stack frames to print in VM-level stack dump")         \
1451                                                                             \
1452   notproduct(intx, MaxElementPrintSize, 256,                                \
1453           "maximum number of elements to print")                            \
1454                                                                             \
1455   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
1456           "maximum number of subklasses to print when printing klass")      \
1457                                                                             \
1458   develop(intx, MaxForceInlineLevel, 100,                                   \
1459           "maximum number of nested calls that are forced for inlining "    \
1460           "(using CompileCommand or marked w/ @ForceInline)")               \
1461           range(0, max_jint)                                                \
1462                                                                             \
1463   product(intx, MinInliningThreshold, 250,                                  \
1464           "The minimum invocation count a method needs to have to be "      \
1465           "inlined")                                                        \
1466           range(0, max_jint)                                                \
1467                                                                             \
1468   develop(intx, MethodHistogramCutoff, 100,                                 \
1469           "The cutoff value for method invocation histogram (+CountCalls)") \
1470                                                                             \
1471   develop(intx, DontYieldALotInterval,    10,                               \
1472           "Interval between which yields will be dropped (milliseconds)")   \
1473                                                                             \
1474   notproduct(intx, DeoptimizeALotInterval,     5,                           \
1475           "Number of exits until DeoptimizeALot kicks in")                  \
1476                                                                             \
1477   notproduct(intx, ZombieALotInterval,     5,                               \
1478           "Number of exits until ZombieALot kicks in")                      \
1479                                                                             \
1480   diagnostic(uintx, MallocMaxTestWords,     0,                              \
1481           "If non-zero, maximum number of words that malloc/realloc can "   \
1482           "allocate (for testing only)")                                    \
1483           range(0, max_uintx)                                               \
1484                                                                             \
1485   product(intx, TypeProfileWidth, 2,                                        \
1486           "Number of receiver types to record in call/cast profile")        \
1487           range(0, 8)                                                       \
1488                                                                             \
1489   develop(intx, BciProfileWidth,      2,                                    \
1490           "Number of return bci's to record in ret profile")                \
1491                                                                             \
1492   product(intx, PerMethodRecompilationCutoff, 400,                          \
1493           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1494           range(-1, max_intx)                                               \
1495                                                                             \
1496   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
1497           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
1498           range(-1, max_intx)                                               \
1499                                                                             \
1500   product(intx, PerMethodTrapLimit,  100,                                   \
1501           "Limit on traps (of one kind) in a method (includes inlines)")    \
1502           range(0, max_jint)                                                \
1503                                                                             \
1504   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
1505           "Limit on speculative traps (of one kind) in a method "           \
1506           "(includes inlines)")                                             \
1507           range(0, max_jint)                                                \
1508                                                                             \
1509   product(intx, PerBytecodeTrapLimit,  4,                                   \
1510           "Limit on traps (of one kind) at a particular BCI")               \
1511           range(0, max_jint)                                                \
1512                                                                             \
1513   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
1514           "Extra method data trap entries for speculation")                 \
1515                                                                             \
1516   develop(intx, InlineFrequencyRatio,    20,                                \
1517           "Ratio of call site execution to caller method invocation")       \
1518           range(0, max_jint)                                                \
1519                                                                             \
1520   diagnostic_pd(intx, InlineFrequencyCount,                                 \
1521           "Count of call site execution necessary to trigger frequent "     \
1522           "inlining")                                                       \
1523           range(0, max_jint)                                                \
1524                                                                             \
1525   develop(intx, InlineThrowCount,    50,                                    \
1526           "Force inlining of interpreted methods that throw this often")    \
1527           range(0, max_jint)                                                \
1528                                                                             \
1529   develop(intx, InlineThrowMaxSize,   200,                                  \
1530           "Force inlining of throwing methods smaller than this")           \
1531           range(0, max_jint)                                                \
1532                                                                             \
1533   develop(intx, ProfilerNodeSize,  1024,                                    \
1534           "Size in K to allocate for the Profile Nodes of each thread")     \
1535           range(0, 1024)                                                    \
1536                                                                             \
1537   product_pd(size_t, MetaspaceSize,                                         \
1538           "Initial threshold (in bytes) at which a garbage collection "     \
1539           "is done to reduce Metaspace usage")                              \
1540           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
1541                                                                             \
1542   product(size_t, MaxMetaspaceSize, max_uintx,                              \
1543           "Maximum size of Metaspaces (in bytes)")                          \
1544           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
1545                                                                             \
1546   product(size_t, CompressedClassSpaceSize, 1*G,                            \
1547           "Maximum size of class area in Metaspace when compressed "        \
1548           "class pointers are used")                                        \
1549           range(1*M, 3*G)                                                   \
1550                                                                             \
1551   manageable(uintx, MinHeapFreeRatio, 40,                                   \
1552           "The minimum percentage of heap free after GC to avoid expansion."\
1553           " For most GCs this applies to the old generation. In G1 and"     \
1554           " ParallelGC it applies to the whole heap.")                      \
1555           range(0, 100)                                                     \
1556           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
1557                                                                             \
1558   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
1559           "The maximum percentage of heap free after GC to avoid shrinking."\
1560           " For most GCs this applies to the old generation. In G1 and"     \
1561           " ParallelGC it applies to the whole heap.")                      \
1562           range(0, 100)                                                     \
1563           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
1564                                                                             \
1565   product(bool, ShrinkHeapInSteps, true,                                    \
1566           "When disabled, informs the GC to shrink the java heap directly"  \
1567           " to the target size at the next full GC rather than requiring"   \
1568           " smaller steps during multiple full GCs.")                       \
1569                                                                             \
1570   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
1571           "Number of milliseconds per MB of free space in the heap")        \
1572           range(0, max_intx)                                                \
1573           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1574                                                                             \
1575   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
1576           "The minimum change in heap space due to GC (in bytes)")          \
1577           range(0, max_uintx)                                               \
1578                                                                             \
1579   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
1580           "The minimum expansion of Metaspace (in bytes)")                  \
1581           range(0, max_uintx)                                               \
1582                                                                             \
1583   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
1584           "The maximum percentage of Metaspace free after GC to avoid "     \
1585           "shrinking")                                                      \
1586           range(0, 100)                                                     \
1587           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1588                                                                             \
1589   product(uintx, MinMetaspaceFreeRatio,    40,                              \
1590           "The minimum percentage of Metaspace free after GC to avoid "     \
1591           "expansion")                                                      \
1592           range(0, 99)                                                      \
1593           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1594                                                                             \
1595   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
1596           "The maximum expansion of Metaspace without full GC (in bytes)")  \
1597           range(0, max_uintx)                                               \
1598                                                                             \
1599   /* stack parameters */                                                    \
1600   product_pd(intx, StackYellowPages,                                        \
1601           "Number of yellow zone (recoverable overflows) pages of size "    \
1602           "4KB. If pages are bigger yellow zone is aligned up.")            \
1603           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
1604                                                                             \
1605   product_pd(intx, StackRedPages,                                           \
1606           "Number of red zone (unrecoverable overflows) pages of size "     \
1607           "4KB. If pages are bigger red zone is aligned up.")               \
1608           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
1609                                                                             \
1610   product_pd(intx, StackReservedPages,                                      \
1611           "Number of reserved zone (reserved to annotated methods) pages"   \
1612           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1613           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1614                                                                             \
1615   product(bool, RestrictReservedStack, true,                                \
1616           "Restrict @ReservedStackAccess to trusted classes")               \
1617                                                                             \
1618   /* greater stack shadow pages can't generate instruction to bang stack */ \
1619   product_pd(intx, StackShadowPages,                                        \
1620           "Number of shadow zone (for overflow checking) pages of size "    \
1621           "4KB. If pages are bigger shadow zone is aligned up. "            \
1622           "This should exceed the depth of the VM and native call stack.")  \
1623           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
1624                                                                             \
1625   product_pd(intx, ThreadStackSize,                                         \
1626           "Thread Stack Size (in Kbytes)")                                  \
1627           range(0, 1 * M)                                                   \
1628                                                                             \
1629   product_pd(intx, VMThreadStackSize,                                       \
1630           "Non-Java Thread Stack Size (in Kbytes)")                         \
1631           range(0, max_intx/(1 * K))                                        \
1632                                                                             \
1633   product_pd(intx, CompilerThreadStackSize,                                 \
1634           "Compiler Thread Stack Size (in Kbytes)")                         \
1635           range(0, max_intx/(1 * K))                                        \
1636                                                                             \
1637   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
1638           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
1639                                                                             \
1640   /* code cache parameters                                    */            \
1641   develop_pd(uintx, CodeCacheSegmentSize,                                   \
1642           "Code cache segment size (in bytes) - smallest unit of "          \
1643           "allocation")                                                     \
1644           range(1, 1024)                                                    \
1645           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
1646                                                                             \
1647   develop_pd(intx, CodeEntryAlignment,                                      \
1648           "Code entry alignment for generated code (in bytes)")             \
1649           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
1650                                                                             \
1651   product_pd(intx, OptoLoopAlignment,                                       \
1652           "Align inner loops to zero relative to this modulus")             \
1653           range(1, 16)                                                      \
1654           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
1655                                                                             \
1656   product_pd(uintx, InitialCodeCacheSize,                                   \
1657           "Initial code cache size (in bytes)")                             \
1658           range(os::vm_page_size(), max_uintx)                              \
1659                                                                             \
1660   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
1661           "Minimum code cache size (in bytes) required to start VM.")       \
1662           range(0, max_uintx)                                               \
1663                                                                             \
1664   product(bool, SegmentedCodeCache, false,                                  \
1665           "Use a segmented code cache")                                     \
1666                                                                             \
1667   product_pd(uintx, ReservedCodeCacheSize,                                  \
1668           "Reserved code cache size (in bytes) - maximum code cache size")  \
1669           range(os::vm_page_size(), max_uintx)                              \
1670                                                                             \
1671   product_pd(uintx, NonProfiledCodeHeapSize,                                \
1672           "Size of code heap with non-profiled methods (in bytes)")         \
1673           range(0, max_uintx)                                               \
1674                                                                             \
1675   product_pd(uintx, ProfiledCodeHeapSize,                                   \
1676           "Size of code heap with profiled methods (in bytes)")             \
1677           range(0, max_uintx)                                               \
1678                                                                             \
1679   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
1680           "Size of code heap with non-nmethods (in bytes)")                 \
1681           range(os::vm_page_size(), max_uintx)                              \
1682                                                                             \
1683   product_pd(uintx, CodeCacheExpansionSize,                                 \
1684           "Code cache expansion size (in bytes)")                           \
1685           range(32*K, max_uintx)                                            \
1686                                                                             \
1687   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
1688           "Minimum number of segments in a code cache block")               \
1689           range(1, 100)                                                     \
1690                                                                             \
1691   notproduct(bool, ExitOnFullCodeCache, false,                              \
1692           "Exit the VM if we fill the code cache")                          \
1693                                                                             \
1694   product(bool, UseCodeCacheFlushing, true,                                 \
1695           "Remove cold/old nmethods from the code cache")                   \
1696                                                                             \
1697   product(double, SweeperThreshold, 0.5,                                    \
1698           "Threshold controlling when code cache sweeper is invoked."       \
1699           "Value is percentage of ReservedCodeCacheSize.")                  \
1700           range(0.0, 100.0)                                                 \
1701                                                                             \
1702   product(uintx, StartAggressiveSweepingAt, 10,                             \
1703           "Start aggressive sweeping if X[%] of the code cache is free."    \
1704           "Segmented code cache: X[%] of the non-profiled heap."            \
1705           "Non-segmented code cache: X[%] of the total code cache")         \
1706           range(0, 100)                                                     \
1707                                                                             \
1708   /* AOT parameters */                                                      \
1709   experimental(bool, UseAOT, false,                                         \
1710           "Use AOT compiled files")                                         \
1711                                                                             \
1712   experimental(ccstrlist, AOTLibrary, NULL,                                 \
1713           "AOT library")                                                    \
1714                                                                             \
1715   experimental(bool, PrintAOT, false,                                       \
1716           "Print used AOT klasses and methods")                             \
1717                                                                             \
1718   notproduct(bool, PrintAOTStatistics, false,                               \
1719           "Print AOT statistics")                                           \
1720                                                                             \
1721   diagnostic(bool, UseAOTStrictLoading, false,                              \
1722           "Exit the VM if any of the AOT libraries has invalid config")     \
1723                                                                             \
1724   product(bool, CalculateClassFingerprint, false,                           \
1725           "Calculate class fingerprint")                                    \
1726                                                                             \
1727   /* interpreter debugging */                                               \
1728   develop(intx, BinarySwitchThreshold, 5,                                   \
1729           "Minimal number of lookupswitch entries for rewriting to binary " \
1730           "switch")                                                         \
1731                                                                             \
1732   develop(intx, StopInterpreterAt, 0,                                       \
1733           "Stop interpreter execution at specified bytecode number")        \
1734                                                                             \
1735   develop(intx, TraceBytecodesAt, 0,                                        \
1736           "Trace bytecodes starting with specified bytecode number")        \
1737                                                                             \
1738   /* compiler interface */                                                  \
1739   develop(intx, CIStart, 0,                                                 \
1740           "The id of the first compilation to permit")                      \
1741                                                                             \
1742   develop(intx, CIStop, max_jint,                                           \
1743           "The id of the last compilation to permit")                       \
1744                                                                             \
1745   develop(intx, CIStartOSR, 0,                                              \
1746           "The id of the first osr compilation to permit "                  \
1747           "(CICountOSR must be on)")                                        \
1748                                                                             \
1749   develop(intx, CIStopOSR, max_jint,                                        \
1750           "The id of the last osr compilation to permit "                   \
1751           "(CICountOSR must be on)")                                        \
1752                                                                             \
1753   develop(intx, CIBreakAtOSR, -1,                                           \
1754           "The id of osr compilation to break at")                          \
1755                                                                             \
1756   develop(intx, CIBreakAt, -1,                                              \
1757           "The id of compilation to break at")                              \
1758                                                                             \
1759   product(ccstrlist, CompileOnly, "",                                       \
1760           "List of methods (pkg/class.name) to restrict compilation to")    \
1761                                                                             \
1762   product(ccstr, CompileCommandFile, NULL,                                  \
1763           "Read compiler commands from this file [.hotspot_compiler]")      \
1764                                                                             \
1765   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
1766           "Read compiler directives from this file")                        \
1767                                                                             \
1768   product(ccstrlist, CompileCommand, "",                                    \
1769           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
1770                                                                             \
1771   develop(bool, ReplayCompiles, false,                                      \
1772           "Enable replay of compilations from ReplayDataFile")              \
1773                                                                             \
1774   product(ccstr, ReplayDataFile, NULL,                                      \
1775           "File containing compilation replay information"                  \
1776           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
1777                                                                             \
1778    product(ccstr, InlineDataFile, NULL,                                     \
1779           "File containing inlining replay information"                     \
1780           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
1781                                                                             \
1782   develop(intx, ReplaySuppressInitializers, 2,                              \
1783           "Control handling of class initialization during replay: "        \
1784           "0 - don't do anything special; "                                 \
1785           "1 - treat all class initializers as empty; "                     \
1786           "2 - treat class initializers for application classes as empty; " \
1787           "3 - allow all class initializers to run during bootstrap but "   \
1788           "    pretend they are empty after starting replay")               \
1789           range(0, 3)                                                       \
1790                                                                             \
1791   develop(bool, ReplayIgnoreInitErrors, false,                              \
1792           "Ignore exceptions thrown during initialization for replay")      \
1793                                                                             \
1794   product(bool, DumpReplayDataOnError, true,                                \
1795           "Record replay data for crashing compiler threads")               \
1796                                                                             \
1797   product(bool, CICompilerCountPerCPU, false,                               \
1798           "1 compiler thread for log(N CPUs)")                              \
1799                                                                             \
1800   notproduct(intx, CICrashAt, -1,                                           \
1801           "id of compilation to trigger assert in compiler thread for "     \
1802           "the purpose of testing, e.g. generation of replay data")         \
1803   notproduct(bool, CIObjectFactoryVerify, false,                            \
1804           "enable potentially expensive verification in ciObjectFactory")   \
1805                                                                             \
1806   diagnostic(bool, AbortVMOnCompilationFailure, false,                      \
1807           "Abort VM when method had failed to compile.")                    \
1808                                                                             \
1809   /* Priorities */                                                          \
1810   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
1811                                                                             \
1812   product(intx, ThreadPriorityPolicy, 0,                                    \
1813           "0 : Normal.                                                     "\
1814           "    VM chooses priorities that are appropriate for normal       "\
1815           "    applications.                                               "\
1816           "    On Windows applications are allowed to use higher native    "\
1817           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
1818           "    not use the highest possible native priority,               "\
1819           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
1820           "    system threads. On Linux thread priorities are ignored      "\
1821           "    because the OS does not support static priority in          "\
1822           "    SCHED_OTHER scheduling class which is the only choice for   "\
1823           "    non-root, non-realtime applications.                        "\
1824           "1 : Aggressive.                                                 "\
1825           "    Java thread priorities map over to the entire range of      "\
1826           "    native thread priorities. Higher Java thread priorities map "\
1827           "    to higher native thread priorities. This policy should be   "\
1828           "    used with care, as sometimes it can cause performance       "\
1829           "    degradation in the application and/or the entire system. On "\
1830           "    Linux/BSD/macOS this policy requires root privilege or an   "\
1831           "    extended capability.")                                       \
1832           range(0, 1)                                                       \
1833                                                                             \
1834   product(bool, ThreadPriorityVerbose, false,                               \
1835           "Print priority changes")                                         \
1836                                                                             \
1837   product(intx, CompilerThreadPriority, -1,                                 \
1838           "The native priority at which compiler threads should run "       \
1839           "(-1 means no change)")                                           \
1840           range(min_jint, max_jint)                                         \
1841                                                                             \
1842   product(intx, VMThreadPriority, -1,                                       \
1843           "The native priority at which the VM thread should run "          \
1844           "(-1 means no change)")                                           \
1845           range(-1, 127)                                                    \
1846                                                                             \
1847   product(intx, JavaPriority1_To_OSPriority, -1,                            \
1848           "Map Java priorities to OS priorities")                           \
1849           range(-1, 127)                                                    \
1850                                                                             \
1851   product(intx, JavaPriority2_To_OSPriority, -1,                            \
1852           "Map Java priorities to OS priorities")                           \
1853           range(-1, 127)                                                    \
1854                                                                             \
1855   product(intx, JavaPriority3_To_OSPriority, -1,                            \
1856           "Map Java priorities to OS priorities")                           \
1857           range(-1, 127)                                                    \
1858                                                                             \
1859   product(intx, JavaPriority4_To_OSPriority, -1,                            \
1860           "Map Java priorities to OS priorities")                           \
1861           range(-1, 127)                                                    \
1862                                                                             \
1863   product(intx, JavaPriority5_To_OSPriority, -1,                            \
1864           "Map Java priorities to OS priorities")                           \
1865           range(-1, 127)                                                    \
1866                                                                             \
1867   product(intx, JavaPriority6_To_OSPriority, -1,                            \
1868           "Map Java priorities to OS priorities")                           \
1869           range(-1, 127)                                                    \
1870                                                                             \
1871   product(intx, JavaPriority7_To_OSPriority, -1,                            \
1872           "Map Java priorities to OS priorities")                           \
1873           range(-1, 127)                                                    \
1874                                                                             \
1875   product(intx, JavaPriority8_To_OSPriority, -1,                            \
1876           "Map Java priorities to OS priorities")                           \
1877           range(-1, 127)                                                    \
1878                                                                             \
1879   product(intx, JavaPriority9_To_OSPriority, -1,                            \
1880           "Map Java priorities to OS priorities")                           \
1881           range(-1, 127)                                                    \
1882                                                                             \
1883   product(intx, JavaPriority10_To_OSPriority,-1,                            \
1884           "Map Java priorities to OS priorities")                           \
1885           range(-1, 127)                                                    \
1886                                                                             \
1887   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
1888           "Java thread priority 10 maps to critical scheduling priority")   \
1889                                                                             \
1890   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
1891           "Compiler thread(s) run at critical scheduling priority")         \
1892                                                                             \
1893   develop(intx, NewCodeParameter,      0,                                   \
1894           "Testing Only: Create a dedicated integer parameter before "      \
1895           "putback")                                                        \
1896                                                                             \
1897   /* new oopmap storage allocation */                                       \
1898   develop(intx, MinOopMapAllocation,     8,                                 \
1899           "Minimum number of OopMap entries in an OopMapSet")               \
1900                                                                             \
1901   /* Background Compilation */                                              \
1902   develop(intx, LongCompileThreshold,     50,                               \
1903           "Used with +TraceLongCompiles")                                   \
1904                                                                             \
1905   /* recompilation */                                                       \
1906   product_pd(intx, CompileThreshold,                                        \
1907           "number of interpreted method invocations before (re-)compiling") \
1908           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
1909                                                                             \
1910   product(double, CompileThresholdScaling, 1.0,                             \
1911           "Factor to control when first compilation happens "               \
1912           "(both with and without tiered compilation): "                    \
1913           "values greater than 1.0 delay counter overflow, "                \
1914           "values between 0 and 1.0 rush counter overflow, "                \
1915           "value of 1.0 leaves compilation thresholds unchanged "           \
1916           "value of 0.0 is equivalent to -Xint. "                           \
1917           ""                                                                \
1918           "Flag can be set as per-method option. "                          \
1919           "If a value is specified for a method, compilation thresholds "   \
1920           "for that method are scaled by both the value of the global flag "\
1921           "and the value of the per-method flag.")                          \
1922           range(0.0, DBL_MAX)                                               \
1923                                                                             \
1924   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
1925           "Interpreter (tier 0) invocation notification frequency")         \
1926           range(0, 30)                                                      \
1927                                                                             \
1928   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
1929           "C1 without MDO (tier 2) invocation notification frequency")      \
1930           range(0, 30)                                                      \
1931                                                                             \
1932   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
1933           "C1 with MDO profiling (tier 3) invocation notification "         \
1934           "frequency")                                                      \
1935           range(0, 30)                                                      \
1936                                                                             \
1937   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
1938           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
1939           range(0, 30)                                                      \
1940                                                                             \
1941   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
1942           "Interpreter (tier 0) invocation notification frequency")         \
1943           range(0, 30)                                                      \
1944                                                                             \
1945   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
1946           "C1 without MDO (tier 2) invocation notification frequency")      \
1947           range(0, 30)                                                      \
1948                                                                             \
1949   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
1950           "C1 with MDO profiling (tier 3) invocation notification "         \
1951           "frequency")                                                      \
1952           range(0, 30)                                                      \
1953                                                                             \
1954   product(intx, Tier2CompileThreshold, 0,                                   \
1955           "threshold at which tier 2 compilation is invoked")               \
1956           range(0, max_jint)                                                \
1957                                                                             \
1958   product(intx, Tier2BackEdgeThreshold, 0,                                  \
1959           "Back edge threshold at which tier 2 compilation is invoked")     \
1960           range(0, max_jint)                                                \
1961                                                                             \
1962   product(intx, Tier3InvocationThreshold, 200,                              \
1963           "Compile if number of method invocations crosses this "           \
1964           "threshold")                                                      \
1965           range(0, max_jint)                                                \
1966                                                                             \
1967   product(intx, Tier3MinInvocationThreshold, 100,                           \
1968           "Minimum invocation to compile at tier 3")                        \
1969           range(0, max_jint)                                                \
1970                                                                             \
1971   product(intx, Tier3CompileThreshold, 2000,                                \
1972           "Threshold at which tier 3 compilation is invoked (invocation "   \
1973           "minimum must be satisfied)")                                     \
1974           range(0, max_jint)                                                \
1975                                                                             \
1976   product(intx, Tier3BackEdgeThreshold,  60000,                             \
1977           "Back edge threshold at which tier 3 OSR compilation is invoked") \
1978           range(0, max_jint)                                                \
1979                                                                             \
1980   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
1981           "Compile if number of method invocations crosses this "           \
1982           "threshold if coming from AOT")                                   \
1983           range(0, max_jint)                                                \
1984                                                                             \
1985   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
1986           "Minimum invocation to compile at tier 3 if coming from AOT")     \
1987           range(0, max_jint)                                                \
1988                                                                             \
1989   product(intx, Tier3AOTCompileThreshold, 15000,                            \
1990           "Threshold at which tier 3 compilation is invoked (invocation "   \
1991           "minimum must be satisfied) if coming from AOT")                  \
1992           range(0, max_jint)                                                \
1993                                                                             \
1994   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
1995           "Back edge threshold at which tier 3 OSR compilation is invoked " \
1996           "if coming from AOT")                                             \
1997           range(0, max_jint)                                                \
1998                                                                             \
1999   diagnostic(intx, Tier0AOTInvocationThreshold, 200,                        \
2000           "Switch to interpreter to profile if the number of method "       \
2001           "invocations crosses this threshold if coming from AOT "          \
2002           "(applicable only with "                                          \
2003           "CompilationMode=high-only|high-only-quick-internal)")            \
2004           range(0, max_jint)                                                \
2005                                                                             \
2006   diagnostic(intx, Tier0AOTMinInvocationThreshold, 100,                     \
2007           "Minimum number of invocations to switch to interpreter "         \
2008           "to profile if coming from AOT "                                  \
2009           "(applicable only with "                                          \
2010           "CompilationMode=high-only|high-only-quick-internal)")            \
2011           range(0, max_jint)                                                \
2012                                                                             \
2013   diagnostic(intx, Tier0AOTCompileThreshold, 2000,                          \
2014           "Threshold at which to switch to interpreter to profile "         \
2015           "if coming from AOT "                                             \
2016           "(invocation minimum must be satisfied, "                         \
2017           "applicable only with "                                           \
2018           "CompilationMode=high-only|high-only-quick-internal)")            \
2019           range(0, max_jint)                                                \
2020                                                                             \
2021   diagnostic(intx, Tier0AOTBackEdgeThreshold,  60000,                       \
2022           "Back edge threshold at which to switch to interpreter "          \
2023           "to profile if coming from AOT "                                  \
2024           "(applicable only with "                                          \
2025           "CompilationMode=high-only|high-only-quick-internal)")            \
2026           range(0, max_jint)                                                \
2027                                                                             \
2028   product(intx, Tier4InvocationThreshold, 5000,                             \
2029           "Compile if number of method invocations crosses this "           \
2030           "threshold")                                                      \
2031           range(0, max_jint)                                                \
2032                                                                             \
2033   product(intx, Tier4MinInvocationThreshold, 600,                           \
2034           "Minimum invocation to compile at tier 4")                        \
2035           range(0, max_jint)                                                \
2036                                                                             \
2037   product(intx, Tier4CompileThreshold, 15000,                               \
2038           "Threshold at which tier 4 compilation is invoked (invocation "   \
2039           "minimum must be satisfied)")                                     \
2040           range(0, max_jint)                                                \
2041                                                                             \
2042   product(intx, Tier4BackEdgeThreshold, 40000,                              \
2043           "Back edge threshold at which tier 4 OSR compilation is invoked") \
2044           range(0, max_jint)                                                \
2045                                                                             \
2046   diagnostic(intx, Tier40InvocationThreshold, 5000,                         \
2047           "Compile if number of method invocations crosses this "           \
2048           "threshold (applicable only with "                                \
2049           "CompilationMode=high-only|high-only-quick-internal)")            \
2050           range(0, max_jint)                                                \
2051                                                                             \
2052   diagnostic(intx, Tier40MinInvocationThreshold, 600,                       \
2053           "Minimum number of invocations to compile at tier 4 "             \
2054           "(applicable only with "                                          \
2055           "CompilationMode=high-only|high-only-quick-internal)")            \
2056           range(0, max_jint)                                                \
2057                                                                             \
2058   diagnostic(intx, Tier40CompileThreshold, 10000,                           \
2059           "Threshold at which tier 4 compilation is invoked (invocation "   \
2060           "minimum must be satisfied, applicable only with "                \
2061           "CompilationMode=high-only|high-only-quick-internal)")            \
2062           range(0, max_jint)                                                \
2063                                                                             \
2064   diagnostic(intx, Tier40BackEdgeThreshold, 15000,                          \
2065           "Back edge threshold at which tier 4 OSR compilation is invoked " \
2066           "(applicable only with "                                          \
2067           "CompilationMode=high-only|high-only-quick-internal)")            \
2068           range(0, max_jint)                                                \
2069                                                                             \
2070   diagnostic(intx, Tier0Delay, 5,                                           \
2071           "If C2 queue size grows over this amount per compiler thread "    \
2072           "do not start profiling in the interpreter "                      \
2073           "(applicable only with "                                          \
2074           "CompilationMode=high-only|high-only-quick-internal)")            \
2075           range(0, max_jint)                                                \
2076                                                                             \
2077   product(intx, Tier3DelayOn, 5,                                            \
2078           "If C2 queue size grows over this amount per compiler thread "    \
2079           "stop compiling at tier 3 and start compiling at tier 2")         \
2080           range(0, max_jint)                                                \
2081                                                                             \
2082   product(intx, Tier3DelayOff, 2,                                           \
2083           "If C2 queue size is less than this amount per compiler thread "  \
2084           "allow methods compiled at tier 2 transition to tier 3")          \
2085           range(0, max_jint)                                                \
2086                                                                             \
2087   product(intx, Tier3LoadFeedback, 5,                                       \
2088           "Tier 3 thresholds will increase twofold when C1 queue size "     \
2089           "reaches this amount per compiler thread")                        \
2090           range(0, max_jint)                                                \
2091                                                                             \
2092   product(intx, Tier4LoadFeedback, 3,                                       \
2093           "Tier 4 thresholds will increase twofold when C2 queue size "     \
2094           "reaches this amount per compiler thread")                        \
2095           range(0, max_jint)                                                \
2096                                                                             \
2097   product(intx, TieredCompileTaskTimeout, 50,                               \
2098           "Kill compile task if method was not used within "                \
2099           "given timeout in milliseconds")                                  \
2100           range(0, max_intx)                                                \
2101                                                                             \
2102   product(intx, TieredStopAtLevel, 4,                                       \
2103           "Stop at given compilation level")                                \
2104           range(0, 4)                                                       \
2105                                                                             \
2106   product(intx, Tier0ProfilingStartPercentage, 200,                         \
2107           "Start profiling in interpreter if the counters exceed tier 3 "   \
2108           "thresholds (tier 4 thresholds with "                             \
2109           "CompilationMode=high-only|high-only-quick-internal)"             \
2110           "by the specified percentage")                                    \
2111           range(0, max_jint)                                                \
2112                                                                             \
2113   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
2114           "Increase the compile threshold for C1 compilation if the code "  \
2115           "cache is filled by the specified percentage")                    \
2116           range(0, 99)                                                      \
2117                                                                             \
2118   product(intx, TieredRateUpdateMinTime, 1,                                 \
2119           "Minimum rate sampling interval (in milliseconds)")               \
2120           range(0, max_intx)                                                \
2121                                                                             \
2122   product(intx, TieredRateUpdateMaxTime, 25,                                \
2123           "Maximum rate sampling interval (in milliseconds)")               \
2124           range(0, max_intx)                                                \
2125                                                                             \
2126   product(ccstr, CompilationMode, "default",                                \
2127           "Compilation modes: "                                             \
2128           "default: normal tiered compilation; "                            \
2129           "quick-only: C1-only mode; "                                      \
2130           "high-only: C2/JVMCI-only mode; "                                 \
2131           "high-only-quick-internal: C2/JVMCI-only mode, "                  \
2132           "with JVMCI compiler compiled with C1.")                          \
2133                                                                             \
2134   product_pd(bool, TieredCompilation,                                       \
2135           "Enable tiered compilation")                                      \
2136                                                                             \
2137   product(bool, PrintTieredEvents, false,                                   \
2138           "Print tiered events notifications")                              \
2139                                                                             \
2140   product_pd(intx, OnStackReplacePercentage,                                \
2141           "NON_TIERED number of method invocations/branches (expressed as " \
2142           "% of CompileThreshold) before (re-)compiling OSR code")          \
2143           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
2144                                                                             \
2145   product(intx, InterpreterProfilePercentage, 33,                           \
2146           "NON_TIERED number of method invocations/branches (expressed as " \
2147           "% of CompileThreshold) before profiling in the interpreter")     \
2148           range(0, 100)                                                     \
2149                                                                             \
2150   develop(intx, DesiredMethodLimit,  8000,                                  \
2151           "The desired maximum method size (in bytecodes) after inlining")  \
2152                                                                             \
2153   develop(intx, HugeMethodLimit,  8000,                                     \
2154           "Don't compile methods larger than this if "                      \
2155           "+DontCompileHugeMethods")                                        \
2156                                                                             \
2157   /* Properties for Java libraries  */                                      \
2158                                                                             \
2159   product(uint64_t, MaxDirectMemorySize, 0,                                 \
2160           "Maximum total size of NIO direct-buffer allocations")            \
2161           range(0, max_jlong)                                               \
2162                                                                             \
2163   /* Flags used for temporary code during development  */                   \
2164                                                                             \
2165   diagnostic(bool, UseNewCode, false,                                       \
2166           "Testing Only: Use the new version while testing")                \
2167                                                                             \
2168   diagnostic(bool, UseNewCode2, false,                                      \
2169           "Testing Only: Use the new version while testing")                \
2170                                                                             \
2171   diagnostic(bool, UseNewCode3, false,                                      \
2172           "Testing Only: Use the new version while testing")                \
2173                                                                             \
2174   /* flags for performance data collection */                               \
2175                                                                             \
2176   product(bool, UsePerfData, true,                                          \
2177           "Flag to disable jvmstat instrumentation for performance testing "\
2178           "and problem isolation purposes")                                 \
2179                                                                             \
2180   product(bool, PerfDataSaveToFile, false,                                  \
2181           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
2182                                                                             \
2183   product(ccstr, PerfDataSaveFile, NULL,                                    \
2184           "Save PerfData memory to the specified absolute pathname. "       \
2185           "The string %p in the file name (if present) "                    \
2186           "will be replaced by pid")                                        \
2187                                                                             \
2188   product(intx, PerfDataSamplingInterval, 50,                               \
2189           "Data sampling interval (in milliseconds)")                       \
2190           range(PeriodicTask::min_interval, max_jint)                       \
2191           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
2192                                                                             \
2193   product(bool, PerfDisableSharedMem, false,                                \
2194           "Store performance data in standard memory")                      \
2195                                                                             \
2196   product(intx, PerfDataMemorySize, 32*K,                                   \
2197           "Size of performance data memory region. Will be rounded "        \
2198           "up to a multiple of the native os page size.")                   \
2199           range(128, 32*64*K)                                               \
2200                                                                             \
2201   product(intx, PerfMaxStringConstLength, 1024,                             \
2202           "Maximum PerfStringConstant string length before truncation")     \
2203           range(32, 32*K)                                                   \
2204                                                                             \
2205   product(bool, PerfAllowAtExitRegistration, false,                         \
2206           "Allow registration of atexit() methods")                         \
2207                                                                             \
2208   product(bool, PerfBypassFileSystemCheck, false,                           \
2209           "Bypass Win32 file system criteria checks (Windows Only)")        \
2210                                                                             \
2211   product(intx, UnguardOnExecutionViolation, 0,                             \
2212           "Unguard page and retry on no-execute fault (Win32 only) "        \
2213           "0=off, 1=conservative, 2=aggressive")                            \
2214           range(0, 2)                                                       \
2215                                                                             \
2216   /* Serviceability Support */                                              \
2217                                                                             \
2218   product(bool, ManagementServer, false,                                    \
2219           "Create JMX Management Server")                                   \
2220                                                                             \
2221   product(bool, DisableAttachMechanism, false,                              \
2222           "Disable mechanism that allows tools to attach to this VM")       \
2223                                                                             \
2224   product(bool, StartAttachListener, false,                                 \
2225           "Always start Attach Listener at VM startup")                     \
2226                                                                             \
2227   product(bool, EnableDynamicAgentLoading, true,                            \
2228           "Allow tools to load agents with the attach mechanism")           \
2229                                                                             \
2230   manageable(bool, PrintConcurrentLocks, false,                             \
2231           "Print java.util.concurrent locks in thread dump")                \
2232                                                                             \
2233   /* Shared spaces */                                                       \
2234                                                                             \
2235   product(bool, UseSharedSpaces, true,                                      \
2236           "Use shared spaces for metadata")                                 \
2237                                                                             \
2238   product(bool, VerifySharedSpaces, false,                                  \
2239           "Verify integrity of shared spaces")                              \
2240                                                                             \
2241   product(bool, RequireSharedSpaces, false,                                 \
2242           "Require shared spaces for metadata")                             \
2243                                                                             \
2244   product(bool, DumpSharedSpaces, false,                                    \
2245           "Special mode: JVM reads a class list, loads classes, builds "    \
2246           "shared spaces, and dumps the shared spaces to a file to be "     \
2247           "used in future JVM runs")                                        \
2248                                                                             \
2249   product(bool, DynamicDumpSharedSpaces, false,                             \
2250           "Dynamic archive")                                                \
2251                                                                             \
2252   product(bool, PrintSharedArchiveAndExit, false,                           \
2253           "Print shared archive file contents")                             \
2254                                                                             \
2255   product(bool, PrintSharedDictionary, false,                               \
2256           "If PrintSharedArchiveAndExit is true, also print the shared "    \
2257           "dictionary")                                                     \
2258                                                                             \
2259   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
2260           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
2261           "Address to allocate shared memory region for class data")        \
2262           range(0, SIZE_MAX)                                                \
2263                                                                             \
2264   product(ccstr, SharedArchiveConfigFile, NULL,                             \
2265           "Data to add to the CDS archive file")                            \
2266                                                                             \
2267   product(uintx, SharedSymbolTableBucketSize, 4,                            \
2268           "Average number of symbols per bucket in shared table")           \
2269           range(2, 246)                                                     \
2270                                                                             \
2271   diagnostic(bool, AllowArchivingWithJavaAgent, false,                      \
2272           "Allow Java agent to be run with CDS dumping")                    \
2273                                                                             \
2274   diagnostic(bool, PrintMethodHandleStubs, false,                           \
2275           "Print generated stub code for method handles")                   \
2276                                                                             \
2277   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
2278           "perform extra checks when constructing method handles")          \
2279                                                                             \
2280   diagnostic(bool, ShowHiddenFrames, false,                                 \
2281           "show method handle implementation frames (usually hidden)")      \
2282                                                                             \
2283   experimental(bool, TrustFinalNonStaticFields, false,                      \
2284           "trust final non-static declarations for constant folding")       \
2285                                                                             \
2286   diagnostic(bool, FoldStableValues, true,                                  \
2287           "Optimize loads from stable fields (marked w/ @Stable)")          \
2288                                                                             \
2289   diagnostic(int, UseBootstrapCallInfo, 1,                                  \
2290           "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2291           "resolved before the bootstrap method is called; 1: when a BSM "  \
2292           "that may accept a BootstrapCallInfo is detected, use that API "  \
2293           "to pass BSM arguments, which allows the BSM to delay their "     \
2294           "resolution; 2+: stress test the BCI API by calling more BSMs "   \
2295           "via that API, instead of with the eagerly-resolved array.")      \
2296                                                                             \
2297   diagnostic(bool, PauseAtStartup,      false,                              \
2298           "Causes the VM to pause at startup time and wait for the pause "  \
2299           "file to be removed (default: ./vm.paused.<pid>)")                \
2300                                                                             \
2301   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
2302           "The file to create and for whose removal to await when pausing " \
2303           "at startup. (default: ./vm.paused.<pid>)")                       \
2304                                                                             \
2305   diagnostic(bool, PauseAtExit, false,                                      \
2306           "Pause and wait for keypress on exit if a debugger is attached")  \
2307                                                                             \
2308   product(bool, ExtendedDTraceProbes,    false,                             \
2309           "Enable performance-impacting dtrace probes")                     \
2310                                                                             \
2311   product(bool, DTraceMethodProbes, false,                                  \
2312           "Enable dtrace probes for method-entry and method-exit")          \
2313                                                                             \
2314   product(bool, DTraceAllocProbes, false,                                   \
2315           "Enable dtrace probes for object allocation")                     \
2316                                                                             \
2317   product(bool, DTraceMonitorProbes, false,                                 \
2318           "Enable dtrace probes for monitor events")                        \
2319                                                                             \
2320   product(bool, RelaxAccessControlCheck, false,                             \
2321           "Relax the access control checks in the verifier")                \
2322                                                                             \
2323   product(uintx, StringTableSize, defaultStringTableSize,                   \
2324           "Number of buckets in the interned String table "                 \
2325           "(will be rounded to nearest higher power of 2)")                 \
2326           range(minimumStringTableSize, 16777216ul /* 2^24 */)              \
2327                                                                             \
2328   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
2329           "Number of buckets in the JVM internal Symbol table")             \
2330           range(minimumSymbolTableSize, 16777216ul /* 2^24 */)              \
2331                                                                             \
2332   product(bool, UseStringDeduplication, false,                              \
2333           "Use string deduplication")                                       \
2334                                                                             \
2335   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
2336           "A string must reach this age (or be promoted to an old region) " \
2337           "to be considered for deduplication")                             \
2338           range(1, markWord::max_age)                                       \
2339                                                                             \
2340   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
2341           "Force table resize every time the table is scanned")             \
2342                                                                             \
2343   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
2344           "Force table rehash every time the table is scanned")             \
2345                                                                             \
2346   diagnostic(bool, WhiteBoxAPI, false,                                      \
2347           "Enable internal testing APIs")                                   \
2348                                                                             \
2349   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
2350            "Default survivor space alignment in bytes")                     \
2351            range(8, 256)                                                    \
2352            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
2353                                                                             \
2354   product(ccstr, DumpLoadedClassList, NULL,                                 \
2355           "Dump the names all loaded classes, that could be stored into "   \
2356           "the CDS archive, in the specified file")                         \
2357                                                                             \
2358   product(ccstr, SharedClassListFile, NULL,                                 \
2359           "Override the default CDS class list")                            \
2360                                                                             \
2361   product(ccstr, SharedArchiveFile, NULL,                                   \
2362           "Override the default location of the CDS archive file")          \
2363                                                                             \
2364   product(ccstr, ArchiveClassesAtExit, NULL,                                \
2365           "The path and name of the dynamic archive file")                  \
2366                                                                             \
2367   product(ccstr, ExtraSharedClassListFile, NULL,                            \
2368           "Extra classlist for building the CDS archive file")              \
2369                                                                             \
2370   diagnostic(intx, ArchiveRelocationMode, 0,                                \
2371            "(0) first map at preferred address, and if "                    \
2372            "unsuccessful, map at alternative address (default); "           \
2373            "(1) always map at alternative address; "                        \
2374            "(2) always map at preferred address, and if unsuccessful, "     \
2375            "do not map the archive")                                        \
2376            range(0, 2)                                                      \
2377                                                                             \
2378   experimental(size_t, ArrayAllocatorMallocLimit, (size_t)-1,               \
2379           "Allocation less than this value will be allocated "              \
2380           "using malloc. Larger allocations will use mmap.")                \
2381                                                                             \
2382   experimental(bool, AlwaysAtomicAccesses, false,                           \
2383           "Accesses to all variables should always be atomic")              \
2384                                                                             \
2385   diagnostic(bool, UseUnalignedAccesses, false,                             \
2386           "Use unaligned memory accesses in Unsafe")                        \
2387                                                                             \
2388   product_pd(bool, PreserveFramePointer,                                    \
2389              "Use the FP register for holding the frame pointer "           \
2390              "and not as a general purpose register.")                      \
2391                                                                             \
2392   diagnostic(bool, CheckIntrinsics, true,                                   \
2393              "When a class C is loaded, check that "                        \
2394              "(1) all intrinsics defined by the VM for class C are present "\
2395              "in the loaded class file and are marked with the "            \
2396              "@HotSpotIntrinsicCandidate annotation, that "                 \
2397              "(2) there is an intrinsic registered for all loaded methods " \
2398              "that are annotated with the @HotSpotIntrinsicCandidate "      \
2399              "annotation, and that "                                        \
2400              "(3) no orphan methods exist for class C (i.e., methods for "  \
2401              "which the VM declares an intrinsic but that are not declared "\
2402              "in the loaded class C. "                                      \
2403              "Check (3) is available only in debug builds.")                \
2404                                                                             \
2405   diagnostic_pd(intx, InitArrayShortSize,                                   \
2406           "Threshold small size (in bytes) for clearing arrays. "           \
2407           "Anything this size or smaller may get converted to discrete "    \
2408           "scalar stores.")                                                 \
2409           range(0, max_intx)                                                \
2410           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
2411                                                                             \
2412   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
2413              "Disable backwards compatibility for compile commands.")       \
2414                                                                             \
2415   diagnostic(bool, CompilerDirectivesPrint, false,                          \
2416              "Print compiler directives on installation.")                  \
2417   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
2418              "Limit on number of compiler directives.")                     \
2419                                                                             \
2420   product(ccstr, AllocateHeapAt, NULL,                                      \
2421           "Path to the directoy where a temporary file will be created "    \
2422           "to use as the backing store for Java Heap.")                     \
2423                                                                             \
2424   experimental(ccstr, AllocateOldGenAt, NULL,                               \
2425           "Path to the directoy where a temporary file will be "            \
2426           "created to use as the backing store for old generation."         \
2427           "File of size Xmx is pre-allocated for performance reason, so"    \
2428           "we need that much space available")                              \
2429                                                                             \
2430   develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0),       \
2431                "Run periodic metaspace verifications (0 - none, "           \
2432                "1 - always, >1 every nth interval)")                        \
2433                                                                             \
2434   diagnostic(bool, ShowRegistersOnAssert, true,                             \
2435           "On internal errors, include registers in error report.")         \
2436                                                                             \
2437   diagnostic(bool, UseSwitchProfiling, true,                                \
2438           "leverage profiling for table/lookup switch")                     \
2439                                                                             \
2440   develop(bool, TraceMemoryWriteback, false,                                \
2441           "Trace memory writeback operations")                              \
2442                                                                             \
2443   JFR_ONLY(product(bool, FlightRecorder, false,                             \
2444           "(Deprecated) Enable Flight Recorder"))                           \
2445                                                                             \
2446   JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL,                      \
2447           "Flight Recorder options"))                                       \
2448                                                                             \
2449   JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
2450           "Start flight recording with options"))                           \
2451                                                                             \
2452   experimental(bool, UseFastUnorderedTimeStamps, false,                     \
2453           "Use platform unstable time where supported for timestamps only") \
2454                                                                             \
2455   product(bool, UseEmptySlotsInSupers, true,                                \
2456                 "Allow allocating fields in empty slots of super-classes")  \
2457                                                                             \
2458   diagnostic(bool, DeoptimizeNMethodBarriersALot, false,                    \
2459                 "Make nmethod barriers deoptimise a lot.")                  \
2460                                                                             \
2461   diagnostic(bool, RuntimeAddressOf, true,                                  \
2462                 "Enable low-level Runtime.addressOf methods.")              \
2463                                                                             \
2464   diagnostic(bool, RuntimeFieldOf, true,                                    \
2465                 "Enable low-level Runtime.field*Of methods.")               \
2466                                                                             \
2467   diagnostic(bool, RuntimeSizeOf, true,                                     \
2468                 "Enable low-level Runtime.*sizeOOf methods.")               \
2469 
2470 // Interface macros
2471 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
2472 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
2473 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
2474 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
2475 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
2476 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
2477 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
2478 #ifdef PRODUCT
2479 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
2480 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
2481 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
2482 #else
2483 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
2484 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
2485 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
2486 #endif // PRODUCT
2487 // Special LP64 flags, product only needed for now.
2488 #ifdef _LP64
2489 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2490 #else
2491 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
2492 #endif // _LP64
2493 
2494 ALL_FLAGS(DECLARE_DEVELOPER_FLAG,     \
2495           DECLARE_PD_DEVELOPER_FLAG,  \
2496           DECLARE_PRODUCT_FLAG,       \
2497           DECLARE_PD_PRODUCT_FLAG,    \
2498           DECLARE_DIAGNOSTIC_FLAG,    \
2499           DECLARE_PD_DIAGNOSTIC_FLAG, \
2500           DECLARE_EXPERIMENTAL_FLAG,  \
2501           DECLARE_NOTPRODUCT_FLAG,    \
2502           DECLARE_MANAGEABLE_FLAG,    \
2503           DECLARE_PRODUCT_RW_FLAG,    \
2504           DECLARE_LP64_PRODUCT_FLAG,  \
2505           IGNORE_RANGE,               \
2506           IGNORE_CONSTRAINT)
2507 
2508 #endif // SHARE_RUNTIME_GLOBALS_HPP