rev 59066 : [mq]: deprecate

   1 /*
   2  * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_RUNTIME_GLOBALS_HPP
  26 #define SHARE_RUNTIME_GLOBALS_HPP
  27 
  28 #include "compiler/compiler_globals.hpp"
  29 #include "gc/shared/gc_globals.hpp"
  30 #include "runtime/globals_shared.hpp"
  31 #include "utilities/align.hpp"
  32 #include "utilities/globalDefinitions.hpp"
  33 #include "utilities/macros.hpp"
  34 #include CPU_HEADER(globals)
  35 #include OS_HEADER(globals)
  36 #include OS_CPU_HEADER(globals)
  37 
  38 // develop flags are settable / visible only during development and are constant in the PRODUCT version
  39 // product flags are always settable / visible
  40 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
  41 
  42 // A flag must be declared with one of the following types:
  43 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t.
  44 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used
  45 // only in this file, because the macrology requires single-token type names.
  46 
  47 // Note: Diagnostic options not meant for VM tuning or for product modes.
  48 // They are to be used for VM quality assurance or field diagnosis
  49 // of VM bugs.  They are hidden so that users will not be encouraged to
  50 // try them as if they were VM ordinary execution options.  However, they
  51 // are available in the product version of the VM.  Under instruction
  52 // from support engineers, VM customers can turn them on to collect
  53 // diagnostic information about VM problems.  To use a VM diagnostic
  54 // option, you must first specify +UnlockDiagnosticVMOptions.
  55 // (This master switch also affects the behavior of -Xprintflags.)
  56 //
  57 // experimental flags are in support of features that are not
  58 //    part of the officially supported product, but are available
  59 //    for experimenting with. They could, for example, be performance
  60 //    features that may not have undergone full or rigorous QA, but which may
  61 //    help performance in some cases and released for experimentation
  62 //    by the community of users and developers. This flag also allows one to
  63 //    be able to build a fully supported product that nonetheless also
  64 //    ships with some unsupported, lightly tested, experimental features.
  65 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
  66 //    UnlockExperimentalVMOptions flag, which allows the control and
  67 //    modification of the experimental flags.
  68 //
  69 // Nota bene: neither diagnostic nor experimental options should be used casually,
  70 //    and they are not supported on production loads, except under explicit
  71 //    direction from support engineers.
  72 //
  73 // manageable flags are writeable external product flags.
  74 //    They are dynamically writeable through the JDK management interface
  75 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
  76 //    These flags are external exported interface (see CCC).  The list of
  77 //    manageable flags can be queried programmatically through the management
  78 //    interface.
  79 //
  80 //    A flag can be made as "manageable" only if
  81 //    - the flag is defined in a CCC as an external exported interface.
  82 //    - the VM implementation supports dynamic setting of the flag.
  83 //      This implies that the VM must *always* query the flag variable
  84 //      and not reuse state related to the flag state at any given time.
  85 //    - you want the flag to be queried programmatically by the customers.
  86 //
  87 // product_rw flags are writeable internal product flags.
  88 //    They are like "manageable" flags but for internal/private use.
  89 //    The list of product_rw flags are internal/private flags which
  90 //    may be changed/removed in a future release.  It can be set
  91 //    through the management interface to get/set value
  92 //    when the name of flag is supplied.
  93 //
  94 //    A flag can be made as "product_rw" only if
  95 //    - the VM implementation supports dynamic setting of the flag.
  96 //      This implies that the VM must *always* query the flag variable
  97 //      and not reuse state related to the flag state at any given time.
  98 //
  99 // Note that when there is a need to support develop flags to be writeable,
 100 // it can be done in the same way as product_rw.
 101 //
 102 // range is a macro that will expand to min and max arguments for range
 103 //    checking code if provided - see jvmFlagRangeList.hpp
 104 //
 105 // constraint is a macro that will expand to custom function call
 106 //    for constraint checking if provided - see jvmFlagConstraintList.hpp
 107 
 108 // Default and minimum StringTable and SymbolTable size values
 109 // Must be powers of 2
 110 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536);
 111 const size_t minimumStringTableSize = 128;
 112 const size_t defaultSymbolTableSize = 32768; // 2^15
 113 const size_t minimumSymbolTableSize = 1024;
 114 
 115 #define RUNTIME_FLAGS(develop, \
 116                       develop_pd, \
 117                       product, \
 118                       product_pd, \
 119                       diagnostic, \
 120                       diagnostic_pd, \
 121                       experimental, \
 122                       notproduct, \
 123                       manageable, \
 124                       product_rw, \
 125                       lp64_product, \
 126                       range, \
 127                       constraint) \
 128                                                                             \
 129   lp64_product(bool, UseCompressedOops, false,                              \
 130           "Use 32-bit object references in 64-bit VM. "                     \
 131           "lp64_product means flag is always constant in 32 bit VM")        \
 132                                                                             \
 133   lp64_product(bool, UseCompressedClassPointers, false,                     \
 134           "Use 32-bit class pointers in 64-bit VM. "                        \
 135           "lp64_product means flag is always constant in 32 bit VM")        \
 136                                                                             \
 137   notproduct(bool, CheckCompressedOops, true,                               \
 138           "Generate checks in encoding/decoding code in debug VM")          \
 139                                                                             \
 140   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 141           "Heap allocation steps through preferred address regions to find" \
 142           " where it can allocate the heap. Number of steps to take per "   \
 143           "region.")                                                        \
 144           range(1, max_uintx)                                               \
 145                                                                             \
 146   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 147           "Default object alignment in bytes, 8 is minimum")                \
 148           range(8, 256)                                                     \
 149           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 150                                                                             \
 151   develop(bool, CleanChunkPoolAsync, true,                                  \
 152           "Clean the chunk pool asynchronously")                            \
 153                                                                             \
 154   diagnostic(uint, HandshakeTimeout, 0,                                     \
 155           "If nonzero set a timeout in milliseconds for handshakes")        \
 156                                                                             \
 157   experimental(bool, AlwaysSafeConstructors, false,                         \
 158           "Force safe construction, as if all fields are final.")           \
 159                                                                             \
 160   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 161           "Enable normal processing of flags relating to field diagnostics")\
 162                                                                             \
 163   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 164           "Enable normal processing of flags relating to experimental "     \
 165           "features")                                                       \
 166                                                                             \
 167   product(bool, JavaMonitorsInStackTrace, true,                             \
 168           "Print information about Java monitor locks when the stacks are"  \
 169           "dumped")                                                         \
 170                                                                             \
 171   product_pd(bool, UseLargePages,                                           \
 172           "Use large page memory")                                          \
 173                                                                             \
 174   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 175           "Allocate large pages individually for better affinity")          \
 176                                                                             \
 177   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 178           "Fail large pages individual allocation")                         \
 179                                                                             \
 180   product(bool, UseLargePagesInMetaspace, false,                            \
 181           "Use large page memory in metaspace. "                            \
 182           "Only used if UseLargePages is enabled.")                         \
 183                                                                             \
 184   product(bool, UseNUMA, false,                                             \
 185           "Use NUMA if available")                                          \
 186                                                                             \
 187   product(bool, UseNUMAInterleaving, false,                                 \
 188           "Interleave memory across NUMA nodes if available")               \
 189                                                                             \
 190   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 191           "Granularity to use for NUMA interleaving on Windows OS")         \
 192           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 193                                                                             \
 194   product(bool, ForceNUMA, false,                                           \
 195           "(Deprecated) Force NUMA optimizations on single-node/UMA systems") \
 196                                                                             \
 197   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 198           "Percentage (0-100) used to weight the current sample when "      \
 199           "computing exponentially decaying average for "                   \
 200           "AdaptiveNUMAChunkSizing")                                        \
 201           range(0, 100)                                                     \
 202                                                                             \
 203   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 204           "Do not reallocate more than this amount per collection")         \
 205           range(0, max_uintx)                                               \
 206                                                                             \
 207   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 208           "Enable adaptive chunk sizing for NUMA")                          \
 209                                                                             \
 210   product(bool, NUMAStats, false,                                           \
 211           "Print NUMA stats in detailed heap information")                  \
 212                                                                             \
 213   product(uintx, NUMAPageScanRate, 256,                                     \
 214           "Maximum number of pages to include in the page scan procedure")  \
 215           range(0, max_uintx)                                               \
 216                                                                             \
 217   product(bool, UseAES, false,                                              \
 218           "Control whether AES instructions are used when available")       \
 219                                                                             \
 220   product(bool, UseFMA, false,                                              \
 221           "Control whether FMA instructions are used when available")       \
 222                                                                             \
 223   product(bool, UseSHA, false,                                              \
 224           "Control whether SHA instructions are used when available")       \
 225                                                                             \
 226   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 227           "Use intrinsics for GHASH versions of crypto")                    \
 228                                                                             \
 229   product(bool, UseBASE64Intrinsics, false,                                 \
 230           "Use intrinsics for java.util.Base64")                            \
 231                                                                             \
 232   product(size_t, LargePageSizeInBytes, 0,                                  \
 233           "Large page size (0 to let VM choose the page size)")             \
 234           range(0, max_uintx)                                               \
 235                                                                             \
 236   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 237           "Use large pages if maximum heap is at least this big")           \
 238           range(0, max_uintx)                                               \
 239                                                                             \
 240   product(bool, ForceTimeHighResolution, false,                             \
 241           "Using high time resolution (for Win32 only)")                    \
 242                                                                             \
 243   develop(bool, TracePcPatching, false,                                     \
 244           "Trace usage of frame::patch_pc")                                 \
 245                                                                             \
 246   develop(bool, TraceRelocator, false,                                      \
 247           "Trace the bytecode relocator")                                   \
 248                                                                             \
 249   develop(bool, TraceLongCompiles, false,                                   \
 250           "Print out every time compilation is longer than "                \
 251           "a given threshold")                                              \
 252                                                                             \
 253   diagnostic(bool, SafepointALot, false,                                    \
 254           "Generate a lot of safepoints. This works with "                  \
 255           "GuaranteedSafepointInterval")                                    \
 256                                                                             \
 257   diagnostic(bool, HandshakeALot, false,                                    \
 258           "Generate a lot of handshakes. This works with "                  \
 259           "GuaranteedSafepointInterval")                                    \
 260                                                                             \
 261   product_pd(bool, BackgroundCompilation,                                   \
 262           "A thread requesting compilation is not blocked during "          \
 263           "compilation")                                                    \
 264                                                                             \
 265   product(bool, PrintVMQWaitTime, false,                                    \
 266           "(Deprecated) Print out the waiting time in VM operation queue")  \
 267                                                                             \
 268   product(bool, MethodFlushing, true,                                       \
 269           "Reclamation of zombie and not-entrant methods")                  \
 270                                                                             \
 271   develop(bool, VerifyStack, false,                                         \
 272           "Verify stack of each thread when it is entering a runtime call") \
 273                                                                             \
 274   diagnostic(bool, ForceUnreachable, false,                                 \
 275           "Make all non code cache addresses to be unreachable by "         \
 276           "forcing use of 64bit literal fixups")                            \
 277                                                                             \
 278   notproduct(bool, StressDerivedPointers, false,                            \
 279           "Force scavenge when a derived pointer is detected on stack "     \
 280           "after rtm call")                                                 \
 281                                                                             \
 282   develop(bool, TraceDerivedPointers, false,                                \
 283           "Trace traversal of derived pointers on stack")                   \
 284                                                                             \
 285   notproduct(bool, TraceCodeBlobStacks, false,                              \
 286           "Trace stack-walk of codeblobs")                                  \
 287                                                                             \
 288   notproduct(bool, PrintRewrites, false,                                    \
 289           "Print methods that are being rewritten")                         \
 290                                                                             \
 291   product(bool, UseInlineCaches, true,                                      \
 292           "Use Inline Caches for virtual calls ")                           \
 293                                                                             \
 294   diagnostic(bool, InlineArrayCopy, true,                                   \
 295           "Inline arraycopy native that is known to be part of "            \
 296           "base library DLL")                                               \
 297                                                                             \
 298   diagnostic(bool, InlineObjectHash, true,                                  \
 299           "Inline Object::hashCode() native that is known to be part "      \
 300           "of base library DLL")                                            \
 301                                                                             \
 302   diagnostic(bool, InlineNatives, true,                                     \
 303           "Inline natives that are known to be part of base library DLL")   \
 304                                                                             \
 305   diagnostic(bool, InlineMathNatives, true,                                 \
 306           "Inline SinD, CosD, etc.")                                        \
 307                                                                             \
 308   diagnostic(bool, InlineClassNatives, true,                                \
 309           "Inline Class.isInstance, etc")                                   \
 310                                                                             \
 311   diagnostic(bool, InlineThreadNatives, true,                               \
 312           "Inline Thread.currentThread, etc")                               \
 313                                                                             \
 314   diagnostic(bool, InlineUnsafeOps, true,                                   \
 315           "Inline memory ops (native methods) from Unsafe")                 \
 316                                                                             \
 317   product(bool, CriticalJNINatives, true,                                   \
 318           "Check for critical JNI entry points")                            \
 319                                                                             \
 320   notproduct(bool, StressCriticalJNINatives, false,                         \
 321           "Exercise register saving code in critical natives")              \
 322                                                                             \
 323   diagnostic(bool, UseAESIntrinsics, false,                                 \
 324           "Use intrinsics for AES versions of crypto")                      \
 325                                                                             \
 326   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 327           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 328                                                                             \
 329   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 330           "Use intrinsics for SHA-1 crypto hash function. "                 \
 331           "Requires that UseSHA is enabled.")                               \
 332                                                                             \
 333   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 334           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 335           "Requires that UseSHA is enabled.")                               \
 336                                                                             \
 337   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 338           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 339           "Requires that UseSHA is enabled.")                               \
 340                                                                             \
 341   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 342           "use intrinsics for java.util.zip.CRC32")                         \
 343                                                                             \
 344   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 345           "use intrinsics for java.util.zip.CRC32C")                        \
 346                                                                             \
 347   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 348           "use intrinsics for java.util.zip.Adler32")                       \
 349                                                                             \
 350   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 351           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 352                                                                             \
 353   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 354          "do not expand intrinsics whose (internal) names appear here")     \
 355                                                                             \
 356   develop(bool, TraceCallFixup, false,                                      \
 357           "Trace all call fixups")                                          \
 358                                                                             \
 359   develop(bool, DeoptimizeALot, false,                                      \
 360           "Deoptimize at every exit from the runtime system")               \
 361                                                                             \
 362   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 363           "A comma separated list of bcis to deoptimize at")                \
 364                                                                             \
 365   develop(bool, DeoptimizeRandom, false,                                    \
 366           "Deoptimize random frames on random exit from the runtime system")\
 367                                                                             \
 368   notproduct(bool, ZombieALot, false,                                       \
 369           "Create zombies (non-entrant) at exit from the runtime system")   \
 370                                                                             \
 371   notproduct(bool, WalkStackALot, false,                                    \
 372           "Trace stack (no print) at every exit from the runtime system")   \
 373                                                                             \
 374   product(bool, Debugging, false,                                           \
 375           "Set when executing debug methods in debug.cpp "                  \
 376           "(to prevent triggering assertions)")                             \
 377                                                                             \
 378   notproduct(bool, VerifyLastFrame, false,                                  \
 379           "Verify oops on last frame on entry to VM")                       \
 380                                                                             \
 381   product(bool, SafepointTimeout, false,                                    \
 382           "Time out and warn or fail after SafepointTimeoutDelay "          \
 383           "milliseconds if failed to reach safepoint")                      \
 384                                                                             \
 385   diagnostic(bool, AbortVMOnSafepointTimeout, false,                        \
 386           "Abort upon failure to reach safepoint (see SafepointTimeout)")   \
 387                                                                             \
 388   diagnostic(bool, AbortVMOnVMOperationTimeout, false,                      \
 389           "Abort upon failure to complete VM operation promptly")           \
 390                                                                             \
 391   diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000,                  \
 392           "Delay in milliseconds for option AbortVMOnVMOperationTimeout")   \
 393           range(0, max_intx)                                                \
 394                                                                             \
 395   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 396   /* typically, at most a few retries are needed                    */      \
 397   product(intx, SuspendRetryCount, 50,                                      \
 398           "Maximum retry count for an external suspend request")            \
 399           range(0, max_intx)                                                \
 400                                                                             \
 401   product(intx, SuspendRetryDelay, 5,                                       \
 402           "Milliseconds to delay per retry (* current_retry_count)")        \
 403           range(0, max_intx)                                                \
 404                                                                             \
 405   product(bool, AssertOnSuspendWaitFailure, false,                          \
 406           "Assert/Guarantee on external suspend wait failure")              \
 407                                                                             \
 408   product(bool, TraceSuspendWaitFailures, false,                            \
 409           "Trace external suspend wait failures")                           \
 410                                                                             \
 411   product(bool, MaxFDLimit, true,                                           \
 412           "Bump the number of file descriptors to maximum in Solaris")      \
 413                                                                             \
 414   diagnostic(bool, LogEvents, true,                                         \
 415           "Enable the various ring buffer event logs")                      \
 416                                                                             \
 417   diagnostic(uintx, LogEventsBufferEntries, 20,                             \
 418           "Number of ring buffer event logs")                               \
 419           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 420                                                                             \
 421   diagnostic(bool, BytecodeVerificationRemote, true,                        \
 422           "Enable the Java bytecode verifier for remote classes")           \
 423                                                                             \
 424   diagnostic(bool, BytecodeVerificationLocal, false,                        \
 425           "Enable the Java bytecode verifier for local classes")            \
 426                                                                             \
 427   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 428           "Force exceptions on FP stack under/overflow")                    \
 429                                                                             \
 430   develop(bool, VerifyStackAtCalls, false,                                  \
 431           "Verify that the stack pointer is unchanged after calls")         \
 432                                                                             \
 433   develop(bool, TraceJavaAssertions, false,                                 \
 434           "Trace java language assertions")                                 \
 435                                                                             \
 436   notproduct(bool, VerifyCodeCache, false,                                  \
 437           "Verify code cache on memory allocation/deallocation")            \
 438                                                                             \
 439   develop(bool, UseMallocOnly, false,                                       \
 440           "Use only malloc/free for allocation (no resource area/arena)")   \
 441                                                                             \
 442   develop(bool, ZapResourceArea, trueInDebug,                               \
 443           "Zap freed resource/arena space with 0xABABABAB")                 \
 444                                                                             \
 445   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 446           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 447                                                                             \
 448   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 449           "Zap allocated/freed stack segments with 0xFADFADED")             \
 450                                                                             \
 451   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 452           "Zap unused heap space with 0xBAADBABE")                          \
 453                                                                             \
 454   develop(bool, CheckZapUnusedHeapArea, false,                              \
 455           "Check zapping of unused heap space")                             \
 456                                                                             \
 457   develop(bool, ZapFillerObjects, trueInDebug,                              \
 458           "Zap filler objects with 0xDEAFBABE")                             \
 459                                                                             \
 460   develop(bool, PrintVMMessages, true,                                      \
 461           "Print VM messages on console")                                   \
 462                                                                             \
 463   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 464           "If > 0, provokes an error after VM initialization; the value "   \
 465           "determines which error to provoke. See test_error_handler() "    \
 466           "in vmError.cpp.")                                                \
 467                                                                             \
 468   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 469           "If > 0, provokes an error inside VM error handler (a secondary " \
 470           "crash). see test_error_handler() in vmError.cpp")                \
 471                                                                             \
 472   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 473           "If true, tests SafeFetch inside error handler.")                 \
 474                                                                             \
 475   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 476           "If true, simulates an unresponsive error handler.")              \
 477                                                                             \
 478   develop(bool, Verbose, false,                                             \
 479           "Print additional debugging information from other modes")        \
 480                                                                             \
 481   develop(bool, PrintMiscellaneous, false,                                  \
 482           "Print uncategorized debugging information (requires +Verbose)")  \
 483                                                                             \
 484   develop(bool, WizardMode, false,                                          \
 485           "Print much more debugging information")                          \
 486                                                                             \
 487   product(bool, ShowMessageBoxOnError, false,                               \
 488           "Keep process alive on VM fatal error")                           \
 489                                                                             \
 490   product(bool, CreateCoredumpOnCrash, true,                                \
 491           "Create core/mini dump on VM fatal error")                        \
 492                                                                             \
 493   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 494           "Timeout, in seconds, to limit the time spent on writing an "     \
 495           "error log in case of a crash.")                                  \
 496           range(0, (uint64_t)max_jlong/1000)                                \
 497                                                                             \
 498   product_pd(bool, UseOSErrorReporting,                                     \
 499           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 500                                                                             \
 501   product(bool, SuppressFatalErrorMessage, false,                           \
 502           "Report NO fatal error message (avoid deadlock)")                 \
 503                                                                             \
 504   product(ccstrlist, OnError, "",                                           \
 505           "Run user-defined commands on fatal error; see VMError.cpp "      \
 506           "for examples")                                                   \
 507                                                                             \
 508   product(ccstrlist, OnOutOfMemoryError, "",                                \
 509           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 510                                                                             \
 511   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 512           "Dump heap to file before any major stop-the-world GC")           \
 513                                                                             \
 514   manageable(bool, HeapDumpAfterFullGC, false,                              \
 515           "Dump heap to file after any major stop-the-world GC")            \
 516                                                                             \
 517   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 518           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 519                                                                             \
 520   manageable(ccstr, HeapDumpPath, NULL,                                     \
 521           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 522           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 523           "in the working directory)")                                      \
 524                                                                             \
 525   develop(bool, BreakAtWarning, false,                                      \
 526           "Execute breakpoint upon encountering VM warning")                \
 527                                                                             \
 528   product(ccstr, NativeMemoryTracking, "off",                               \
 529           "Native memory tracking options")                                 \
 530                                                                             \
 531   diagnostic(bool, PrintNMTStatistics, false,                               \
 532           "Print native memory tracking summary data if it is on")          \
 533                                                                             \
 534   diagnostic(bool, LogCompilation, false,                                   \
 535           "Log compilation activity in detail to LogFile")                  \
 536                                                                             \
 537   product(bool, PrintCompilation, false,                                    \
 538           "Print compilations")                                             \
 539                                                                             \
 540   product(bool, PrintExtendedThreadInfo, false,                             \
 541           "Print more information in thread dump")                          \
 542                                                                             \
 543   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 544           "0: do not allow scavengable oops in the code cache; "            \
 545           "1: allow scavenging from the code cache; "                       \
 546           "2: emit as many constants as the compiler can see")              \
 547           range(0, 2)                                                       \
 548                                                                             \
 549   product(bool, AlwaysRestoreFPU, false,                                    \
 550           "Restore the FPU control word after every JNI call (expensive)")  \
 551                                                                             \
 552   diagnostic(bool, PrintCompilation2, false,                                \
 553           "Print additional statistics per compilation")                    \
 554                                                                             \
 555   diagnostic(bool, PrintAdapterHandlers, false,                             \
 556           "Print code generated for i2c/c2i adapters")                      \
 557                                                                             \
 558   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 559           "Verify that i2c/c2i adapters are called properly")               \
 560                                                                             \
 561   develop(bool, VerifyAdapterSharing, false,                                \
 562           "Verify that the code for shared adapters is the equivalent")     \
 563                                                                             \
 564   diagnostic(bool, PrintAssembly, false,                                    \
 565           "Print assembly code (using external disassembler.so)")           \
 566                                                                             \
 567   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 568           "Print options string passed to disassembler.so")                 \
 569                                                                             \
 570   notproduct(bool, PrintNMethodStatistics, false,                           \
 571           "Print a summary statistic for the generated nmethods")           \
 572                                                                             \
 573   diagnostic(bool, PrintNMethods, false,                                    \
 574           "Print assembly code for nmethods when generated")                \
 575                                                                             \
 576   diagnostic(bool, PrintNativeNMethods, false,                              \
 577           "Print assembly code for native nmethods when generated")         \
 578                                                                             \
 579   develop(bool, PrintDebugInfo, false,                                      \
 580           "Print debug information for all nmethods when generated")        \
 581                                                                             \
 582   develop(bool, PrintRelocations, false,                                    \
 583           "Print relocation information for all nmethods when generated")   \
 584                                                                             \
 585   develop(bool, PrintDependencies, false,                                   \
 586           "Print dependency information for all nmethods when generated")   \
 587                                                                             \
 588   develop(bool, PrintExceptionHandlers, false,                              \
 589           "Print exception handler tables for all nmethods when generated") \
 590                                                                             \
 591   develop(bool, StressCompiledExceptionHandlers, false,                     \
 592           "Exercise compiled exception handlers")                           \
 593                                                                             \
 594   develop(bool, InterceptOSException, false,                                \
 595           "Start debugger when an implicit OS (e.g. NULL) "                 \
 596           "exception happens")                                              \
 597                                                                             \
 598   product(bool, PrintCodeCache, false,                                      \
 599           "Print the code cache memory usage when exiting")                 \
 600                                                                             \
 601   develop(bool, PrintCodeCache2, false,                                     \
 602           "Print detailed usage information on the code cache when exiting")\
 603                                                                             \
 604   product(bool, PrintCodeCacheOnCompilation, false,                         \
 605           "Print the code cache memory usage each time a method is "        \
 606           "compiled")                                                       \
 607                                                                             \
 608   diagnostic(bool, PrintCodeHeapAnalytics, false,                           \
 609           "Print code heap usage statistics on exit and on full condition") \
 610                                                                             \
 611   diagnostic(bool, PrintStubCode, false,                                    \
 612           "Print generated stub code")                                      \
 613                                                                             \
 614   product(bool, StackTraceInThrowable, true,                                \
 615           "Collect backtrace in throwable when exception happens")          \
 616                                                                             \
 617   product(bool, OmitStackTraceInFastThrow, true,                            \
 618           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 619                                                                             \
 620   manageable(bool, ShowCodeDetailsInExceptionMessages, false,               \
 621           "Show exception messages from RuntimeExceptions that contain "    \
 622           "snippets of the failing code. Disable this to improve privacy.") \
 623                                                                             \
 624   product(bool, PrintWarnings, true,                                        \
 625           "Print JVM warnings to output stream")                            \
 626                                                                             \
 627   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 628           "Print warnings for stalled SpinLocks")                           \
 629                                                                             \
 630   product(bool, RegisterFinalizersAtInit, true,                             \
 631           "Register finalizable objects at end of Object.<init> or "        \
 632           "after allocation")                                               \
 633                                                                             \
 634   develop(bool, RegisterReferences, true,                                   \
 635           "Tell whether the VM should register soft/weak/final/phantom "    \
 636           "references")                                                     \
 637                                                                             \
 638   develop(bool, IgnoreRewrites, false,                                      \
 639           "Suppress rewrites of bytecodes in the oopmap generator. "        \
 640           "This is unsafe!")                                                \
 641                                                                             \
 642   develop(bool, PrintCodeCacheExtension, false,                             \
 643           "Print extension of code cache")                                  \
 644                                                                             \
 645   develop(bool, UsePrivilegedStack, true,                                   \
 646           "Enable the security JVM functions")                              \
 647                                                                             \
 648   develop(bool, ProtectionDomainVerification, true,                         \
 649           "Verify protection domain before resolution in system dictionary")\
 650                                                                             \
 651   product(bool, ClassUnloading, true,                                       \
 652           "Do unloading of classes")                                        \
 653                                                                             \
 654   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
 655           "Do unloading of classes with a concurrent marking cycle")        \
 656                                                                             \
 657   develop(bool, DisableStartThread, false,                                  \
 658           "Disable starting of additional Java threads "                    \
 659           "(for debugging only)")                                           \
 660                                                                             \
 661   develop(bool, MemProfiling, false,                                        \
 662           "Write memory usage profiling to log file")                       \
 663                                                                             \
 664   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 665           "Print the system dictionary at exit")                            \
 666                                                                             \
 667   diagnostic(bool, DynamicallyResizeSystemDictionaries, true,               \
 668           "Dynamically resize system dictionaries as needed")               \
 669                                                                             \
 670   product(bool, AlwaysLockClassLoader, false,                               \
 671           "Require the VM to acquire the class loader lock before calling " \
 672           "loadClass() even for class loaders registering "                 \
 673           "as parallel capable")                                            \
 674                                                                             \
 675   product(bool, AllowParallelDefineClass, false,                            \
 676           "Allow parallel defineClass requests for class loaders "          \
 677           "registering as parallel capable")                                \
 678                                                                             \
 679   product_pd(bool, DontYieldALot,                                           \
 680           "Throw away obvious excess yield calls")                          \
 681                                                                             \
 682   develop(bool, UseDetachedThreads, true,                                   \
 683           "Use detached threads that are recycled upon termination "        \
 684           "(for Solaris only)")                                             \
 685                                                                             \
 686   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
 687                "Disable the use of stack guard pages if the JVM is loaded " \
 688                "on the primordial process thread")                          \
 689                                                                             \
 690   product(bool, UseLWPSynchronization, true,                                \
 691           "Use LWP-based instead of libthread-based synchronization "       \
 692           "(SPARC only)")                                                   \
 693                                                                             \
 694   product(intx, MonitorBound, 0, "(Deprecated) Bound Monitor population")   \
 695           range(0, max_jint)                                                \
 696                                                                             \
 697   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
 698                 "Percentage of used monitors before triggering cleanup "    \
 699                 "safepoint which deflates monitors (0 is off). "            \
 700                 "The check is performed on GuaranteedSafepointInterval.")   \
 701                 range(0, 100)                                               \
 702                                                                             \
 703   experimental(intx, hashCode, 5,                                           \
 704                "(Unstable) select hashCode generation algorithm")           \
 705                                                                             \
 706   product(bool, FilterSpuriousWakeups, true,                                \
 707           "When true prevents OS-level spurious, or premature, wakeups "    \
 708           "from Object.wait (Ignored for Windows)")                         \
 709                                                                             \
 710   develop(bool, UsePthreads, false,                                         \
 711           "Use pthread-based instead of libthread-based synchronization "   \
 712           "(SPARC only)")                                                   \
 713                                                                             \
 714   product(bool, ReduceSignalUsage, false,                                   \
 715           "Reduce the use of OS signals in Java and/or the VM")             \
 716                                                                             \
 717   develop(bool, LoadLineNumberTables, true,                                 \
 718           "Tell whether the class file parser loads line number tables")    \
 719                                                                             \
 720   develop(bool, LoadLocalVariableTables, true,                              \
 721           "Tell whether the class file parser loads local variable tables") \
 722                                                                             \
 723   develop(bool, LoadLocalVariableTypeTables, true,                          \
 724           "Tell whether the class file parser loads local variable type"    \
 725           "tables")                                                         \
 726                                                                             \
 727   product(bool, AllowUserSignalHandlers, false,                             \
 728           "Do not complain if the application installs signal handlers "    \
 729           "(Solaris & Linux only)")                                         \
 730                                                                             \
 731   product(bool, UseSignalChaining, true,                                    \
 732           "Use signal-chaining to invoke signal handlers installed "        \
 733           "by the application (Solaris & Linux only)")                      \
 734                                                                             \
 735   product(bool, RestoreMXCSROnJNICalls, false,                              \
 736           "Restore MXCSR when returning from JNI calls")                    \
 737                                                                             \
 738   product(bool, CheckJNICalls, false,                                       \
 739           "Verify all arguments to JNI calls")                              \
 740                                                                             \
 741   product(bool, UseFastJNIAccessors, true,                                  \
 742           "Use optimized versions of Get<Primitive>Field")                  \
 743                                                                             \
 744   product(intx, MaxJNILocalCapacity, 65536,                                 \
 745           "Maximum allowable local JNI handle capacity to "                 \
 746           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
 747           "where <= 0 is unlimited, default: 65536")                        \
 748           range(min_intx, max_intx)                                         \
 749                                                                             \
 750   product(bool, EagerXrunInit, false,                                       \
 751           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 752           "but not all -Xrun libraries may support the state of the VM "    \
 753           "at this time")                                                   \
 754                                                                             \
 755   product(bool, PreserveAllAnnotations, false,                              \
 756           "Preserve RuntimeInvisibleAnnotations as well "                   \
 757           "as RuntimeVisibleAnnotations")                                   \
 758                                                                             \
 759   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 760           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 761                                                                             \
 762   product(bool, UseXMMForArrayCopy, false,                                  \
 763           "Use SSE2 MOVQ instruction for Arraycopy")                        \
 764                                                                             \
 765   notproduct(bool, PrintFieldLayout, false,                                 \
 766           "Print field layout for each class")                              \
 767                                                                             \
 768   /* Need to limit the extent of the padding to reasonable size.          */\
 769   /* 8K is well beyond the reasonable HW cache line size, even with       */\
 770   /* aggressive prefetching, while still leaving the room for segregating */\
 771   /* among the distinct pages.                                            */\
 772   product(intx, ContendedPaddingWidth, 128,                                 \
 773           "How many bytes to pad the fields/classes marked @Contended with")\
 774           range(0, 8192)                                                    \
 775           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
 776                                                                             \
 777   product(bool, EnableContended, true,                                      \
 778           "Enable @Contended annotation support")                           \
 779                                                                             \
 780   product(bool, RestrictContended, true,                                    \
 781           "Restrict @Contended to trusted classes")                         \
 782                                                                             \
 783   product(bool, UseBiasedLocking, true,                                     \
 784           "Enable biased locking in JVM")                                   \
 785                                                                             \
 786   product(intx, BiasedLockingStartupDelay, 0,                               \
 787           "Number of milliseconds to wait before enabling biased locking")  \
 788           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
 789           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
 790                                                                             \
 791   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
 792           "Print statistics of biased locking in JVM")                      \
 793                                                                             \
 794   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
 795           "Threshold of number of revocations per type to try to "          \
 796           "rebias all objects in the heap of that type")                    \
 797           range(0, max_intx)                                                \
 798           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
 799                                                                             \
 800   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
 801           "Threshold of number of revocations per type to permanently "     \
 802           "revoke biases of all objects in the heap of that type")          \
 803           range(0, max_intx)                                                \
 804           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
 805                                                                             \
 806   product(intx, BiasedLockingDecayTime, 25000,                              \
 807           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
 808           "type after previous bulk rebias")                                \
 809           range(500, max_intx)                                              \
 810           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
 811                                                                             \
 812   product(bool, ExitOnOutOfMemoryError, false,                              \
 813           "JVM exits on the first occurrence of an out-of-memory error")    \
 814                                                                             \
 815   product(bool, CrashOnOutOfMemoryError, false,                             \
 816           "JVM aborts, producing an error log and core/mini dump, on the "  \
 817           "first occurrence of an out-of-memory error")                     \
 818                                                                             \
 819   /* tracing */                                                             \
 820                                                                             \
 821   develop(bool, StressRewriter, false,                                      \
 822           "Stress linktime bytecode rewriting")                             \
 823                                                                             \
 824   product(ccstr, TraceJVMTI, NULL,                                          \
 825           "Trace flags for JVMTI functions and events")                     \
 826                                                                             \
 827   /* This option can change an EMCP method into an obsolete method. */      \
 828   /* This can affect tests that except specific methods to be EMCP. */      \
 829   /* This option should be used with caution.                       */      \
 830   product(bool, StressLdcRewrite, false,                                    \
 831           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
 832                                                                             \
 833   /* change to false by default sometime after Mustang */                   \
 834   product(bool, VerifyMergedCPBytecodes, true,                              \
 835           "Verify bytecodes after RedefineClasses constant pool merging")   \
 836                                                                             \
 837   product(bool, AllowRedefinitionToAddDeleteMethods, false,                 \
 838           "(Deprecated) Allow redefinition to add and delete private "      \
 839           "static or final methods for compatibility with old releases")    \
 840                                                                             \
 841   develop(bool, TraceBytecodes, false,                                      \
 842           "Trace bytecode execution")                                       \
 843                                                                             \
 844   develop(bool, TraceICs, false,                                            \
 845           "Trace inline cache changes")                                     \
 846                                                                             \
 847   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
 848           "Trace method invocation counter overflow")                       \
 849                                                                             \
 850   develop(bool, TraceInlineCacheClearing, false,                            \
 851           "Trace clearing of inline caches in nmethods")                    \
 852                                                                             \
 853   develop(bool, TraceDependencies, false,                                   \
 854           "Trace dependencies")                                             \
 855                                                                             \
 856   develop(bool, VerifyDependencies, trueInDebug,                            \
 857           "Exercise and verify the compilation dependency mechanism")       \
 858                                                                             \
 859   develop(bool, TraceNewOopMapGeneration, false,                            \
 860           "Trace OopMapGeneration")                                         \
 861                                                                             \
 862   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
 863           "Trace OopMapGeneration: print detailed cell states")             \
 864                                                                             \
 865   develop(bool, TimeOopMap, false,                                          \
 866           "Time calls to GenerateOopMap::compute_map() in sum")             \
 867                                                                             \
 868   develop(bool, TimeOopMap2, false,                                         \
 869           "Time calls to GenerateOopMap::compute_map() individually")       \
 870                                                                             \
 871   develop(bool, TraceOopMapRewrites, false,                                 \
 872           "Trace rewriting of method oops during oop map generation")       \
 873                                                                             \
 874   develop(bool, TraceICBuffer, false,                                       \
 875           "Trace usage of IC buffer")                                       \
 876                                                                             \
 877   develop(bool, TraceCompiledIC, false,                                     \
 878           "Trace changes of compiled IC")                                   \
 879                                                                             \
 880   develop(bool, FLSVerifyDictionary, false,                                 \
 881           "Do lots of (expensive) FLS dictionary verification")             \
 882                                                                             \
 883                                                                             \
 884   notproduct(bool, CheckMemoryInitialization, false,                        \
 885           "Check memory initialization")                                    \
 886                                                                             \
 887   product(uintx, ProcessDistributionStride, 4,                              \
 888           "Stride through processors when distributing processes")          \
 889           range(0, max_juint)                                               \
 890                                                                             \
 891   develop(bool, TraceFinalizerRegistration, false,                          \
 892           "Trace registration of final references")                         \
 893                                                                             \
 894   product(bool, IgnoreEmptyClassPaths, false,                               \
 895           "Ignore empty path elements in -classpath")                       \
 896                                                                             \
 897   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
 898           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
 899           "Initial size of the boot class loader data metaspace")           \
 900           range(30*K, max_uintx/BytesPerWord)                               \
 901           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
 902                                                                             \
 903   product(bool, PrintHeapAtSIGBREAK, true,                                  \
 904           "Print heap layout in response to SIGBREAK")                      \
 905                                                                             \
 906   manageable(bool, PrintClassHistogram, false,                              \
 907           "Print a histogram of class instances")                           \
 908                                                                             \
 909   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
 910           "The percentage of the used heap that the instances of a class "  \
 911           "must occupy for the class to generate a trace event")            \
 912           range(0.0, 100.0)                                                 \
 913                                                                             \
 914   /* JVMTI heap profiling */                                                \
 915                                                                             \
 916   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
 917           "Trace JVMTI object tagging calls")                               \
 918                                                                             \
 919   diagnostic(bool, VerifyBeforeIteration, false,                            \
 920           "Verify memory system before JVMTI iteration")                    \
 921                                                                             \
 922   /* compiler interface */                                                  \
 923                                                                             \
 924   develop(bool, CIPrintCompilerName, false,                                 \
 925           "when CIPrint is active, print the name of the active compiler")  \
 926                                                                             \
 927   diagnostic(bool, CIPrintCompileQueue, false,                              \
 928           "display the contents of the compile queue whenever a "           \
 929           "compilation is enqueued")                                        \
 930                                                                             \
 931   develop(bool, CIPrintRequests, false,                                     \
 932           "display every request for compilation")                          \
 933                                                                             \
 934   product(bool, CITime, false,                                              \
 935           "collect timing information for compilation")                     \
 936                                                                             \
 937   develop(bool, CITimeVerbose, false,                                       \
 938           "be more verbose in compilation timings")                         \
 939                                                                             \
 940   develop(bool, CITimeEach, false,                                          \
 941           "display timing information after each successful compilation")   \
 942                                                                             \
 943   develop(bool, CICountOSR, false,                                          \
 944           "use a separate counter when assigning ids to osr compilations")  \
 945                                                                             \
 946   develop(bool, CICompileNatives, true,                                     \
 947           "compile native methods if supported by the compiler")            \
 948                                                                             \
 949   develop_pd(bool, CICompileOSR,                                            \
 950           "compile on stack replacement methods if supported by the "       \
 951           "compiler")                                                       \
 952                                                                             \
 953   develop(bool, CIPrintMethodCodes, false,                                  \
 954           "print method bytecodes of the compiled code")                    \
 955                                                                             \
 956   develop(bool, CIPrintTypeFlow, false,                                     \
 957           "print the results of ciTypeFlow analysis")                       \
 958                                                                             \
 959   develop(bool, CITraceTypeFlow, false,                                     \
 960           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
 961                                                                             \
 962   develop(intx, OSROnlyBCI, -1,                                             \
 963           "OSR only at this bci.  Negative values mean exclude that bci")   \
 964                                                                             \
 965   /* compiler */                                                            \
 966                                                                             \
 967   /* notice: the max range value here is max_jint, not max_intx  */         \
 968   /* because of overflow issue                                   */         \
 969   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
 970           "Number of compiler threads to run")                              \
 971           range(0, max_jint)                                                \
 972           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
 973                                                                             \
 974   product(bool, UseDynamicNumberOfCompilerThreads, true,                    \
 975           "Dynamically choose the number of parallel compiler threads")     \
 976                                                                             \
 977   diagnostic(bool, ReduceNumberOfCompilerThreads, true,                     \
 978              "Reduce the number of parallel compiler threads when they "    \
 979              "are not used")                                                \
 980                                                                             \
 981   diagnostic(bool, TraceCompilerThreads, false,                             \
 982              "Trace creation and removal of compiler threads")              \
 983                                                                             \
 984   develop(bool, InjectCompilerCreationFailure, false,                       \
 985           "Inject thread creation failures for "                            \
 986           "UseDynamicNumberOfCompilerThreads")                              \
 987                                                                             \
 988   develop(bool, UseStackBanging, true,                                      \
 989           "use stack banging for stack overflow checks (required for "      \
 990           "proper StackOverflow handling; disable only to measure cost "    \
 991           "of stackbanging)")                                               \
 992                                                                             \
 993   develop(bool, GenerateSynchronizationCode, true,                          \
 994           "generate locking/unlocking code for synchronized methods and "   \
 995           "monitors")                                                       \
 996                                                                             \
 997   develop(bool, GenerateRangeChecks, true,                                  \
 998           "Generate range checks for array accesses")                       \
 999                                                                             \
1000   diagnostic_pd(bool, ImplicitNullChecks,                                   \
1001           "Generate code for implicit null checks")                         \
1002                                                                             \
1003   product_pd(bool, TrapBasedNullChecks,                                     \
1004           "Generate code for null checks that uses a cmp and trap "         \
1005           "instruction raising SIGTRAP.  This is only used if an access to" \
1006           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
1007           "ImplicitNullChecks don't work (PPC64).")                         \
1008                                                                             \
1009   diagnostic(bool, EnableThreadSMRExtraValidityChecks, true,                \
1010              "Enable Thread SMR extra validity checks")                     \
1011                                                                             \
1012   diagnostic(bool, EnableThreadSMRStatistics, trueInDebug,                  \
1013              "Enable Thread SMR Statistics")                                \
1014                                                                             \
1015   product(bool, UseNotificationThread, true,                                \
1016           "Use Notification Thread")                                        \
1017                                                                             \
1018   product(bool, Inline, true,                                               \
1019           "Enable inlining")                                                \
1020                                                                             \
1021   product(bool, ClipInlining, true,                                         \
1022           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
1023                                                                             \
1024   develop(bool, UseCHA, true,                                               \
1025           "Enable CHA")                                                     \
1026                                                                             \
1027   product(bool, UseTypeProfile, true,                                       \
1028           "Check interpreter profile for historically monomorphic calls")   \
1029                                                                             \
1030   diagnostic(bool, PrintInlining, false,                                    \
1031           "Print inlining optimizations")                                   \
1032                                                                             \
1033   product(bool, UsePopCountInstruction, false,                              \
1034           "Use population count instruction")                               \
1035                                                                             \
1036   develop(bool, EagerInitialization, false,                                 \
1037           "Eagerly initialize classes if possible")                         \
1038                                                                             \
1039   diagnostic(bool, LogTouchedMethods, false,                                \
1040           "Log methods which have been ever touched in runtime")            \
1041                                                                             \
1042   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
1043           "Print all methods that have been ever touched in runtime")       \
1044                                                                             \
1045   develop(bool, TraceMethodReplacement, false,                              \
1046           "Print when methods are replaced do to recompilation")            \
1047                                                                             \
1048   develop(bool, PrintMethodFlushing, false,                                 \
1049           "Print the nmethods being flushed")                               \
1050                                                                             \
1051   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
1052           "print statistics about method flushing")                         \
1053                                                                             \
1054   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
1055           "Number of compiled code invocations after which "                \
1056           "the method is considered as hot by the flusher")                 \
1057           range(1, max_jint)                                                \
1058                                                                             \
1059   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
1060           "Minimum number of sweeper passes before an nmethod "             \
1061           "can be flushed")                                                 \
1062           range(0, max_intx)                                                \
1063                                                                             \
1064   product(bool, UseCodeAging, true,                                         \
1065           "Insert counter to detect warm methods")                          \
1066                                                                             \
1067   diagnostic(bool, StressCodeAging, false,                                  \
1068           "Start with counters compiled in")                                \
1069                                                                             \
1070   develop(bool, StressCodeBuffers, false,                                   \
1071           "Exercise code buffer expansion and other rare state changes")    \
1072                                                                             \
1073   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
1074           "Generate extra debugging information for non-safepoints in "     \
1075           "nmethods")                                                       \
1076                                                                             \
1077   product(bool, PrintVMOptions, false,                                      \
1078           "Print flags that appeared on the command line")                  \
1079                                                                             \
1080   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
1081           "Ignore unrecognized VM options")                                 \
1082                                                                             \
1083   product(bool, PrintCommandLineFlags, false,                               \
1084           "Print flags specified on command line or set by ergonomics")     \
1085                                                                             \
1086   product(bool, PrintFlagsInitial, false,                                   \
1087           "Print all VM flags before argument processing and exit VM")      \
1088                                                                             \
1089   product(bool, PrintFlagsFinal, false,                                     \
1090           "Print all VM flags after argument and ergonomic processing")     \
1091                                                                             \
1092   notproduct(bool, PrintFlagsWithComments, false,                           \
1093           "Print all VM flags with default values and descriptions and "    \
1094           "exit")                                                           \
1095                                                                             \
1096   product(bool, PrintFlagsRanges, false,                                    \
1097           "Print VM flags and their ranges")                                \
1098                                                                             \
1099   diagnostic(bool, SerializeVMOutput, true,                                 \
1100           "Use a mutex to serialize output to tty and LogFile")             \
1101                                                                             \
1102   diagnostic(bool, DisplayVMOutput, true,                                   \
1103           "Display all VM output on the tty, independently of LogVMOutput") \
1104                                                                             \
1105   diagnostic(bool, LogVMOutput, false,                                      \
1106           "Save VM output to LogFile")                                      \
1107                                                                             \
1108   diagnostic(ccstr, LogFile, NULL,                                          \
1109           "If LogVMOutput or LogCompilation is on, save VM output to "      \
1110           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1111                                                                             \
1112   product(ccstr, ErrorFile, NULL,                                           \
1113           "If an error occurs, save the error data to this file "           \
1114           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
1115                                                                             \
1116   product(bool, ExtensiveErrorReports,                                      \
1117           PRODUCT_ONLY(false) NOT_PRODUCT(true),                            \
1118           "Error reports are more extensive.")                              \
1119                                                                             \
1120   product(bool, DisplayVMOutputToStderr, false,                             \
1121           "If DisplayVMOutput is true, display all VM output to stderr")    \
1122                                                                             \
1123   product(bool, DisplayVMOutputToStdout, false,                             \
1124           "If DisplayVMOutput is true, display all VM output to stdout")    \
1125                                                                             \
1126   product(bool, ErrorFileToStderr, false,                                   \
1127           "If true, error data is printed to stderr instead of a file")     \
1128                                                                             \
1129   product(bool, ErrorFileToStdout, false,                                   \
1130           "If true, error data is printed to stdout instead of a file")     \
1131                                                                             \
1132   product(bool, UseHeavyMonitors, false,                                    \
1133           "use heavyweight instead of lightweight Java monitors")           \
1134                                                                             \
1135   product(bool, PrintStringTableStatistics, false,                          \
1136           "print statistics about the StringTable and SymbolTable")         \
1137                                                                             \
1138   diagnostic(bool, VerifyStringTableAtExit, false,                          \
1139           "verify StringTable contents at exit")                            \
1140                                                                             \
1141   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
1142           "print histogram of the symbol table")                            \
1143                                                                             \
1144   notproduct(bool, ExitVMOnVerifyError, false,                              \
1145           "standard exit from VM if bytecode verify error "                 \
1146           "(only in debug mode)")                                           \
1147                                                                             \
1148   diagnostic(ccstr, AbortVMOnException, NULL,                               \
1149           "Call fatal if this exception is thrown.  Example: "              \
1150           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1151                                                                             \
1152   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
1153           "Call fatal if the exception pointed by AbortVMOnException "      \
1154           "has this message")                                               \
1155                                                                             \
1156   develop(bool, DebugVtables, false,                                        \
1157           "add debugging code to vtable dispatch")                          \
1158                                                                             \
1159   notproduct(bool, PrintVtableStats, false,                                 \
1160           "print vtables stats at end of run")                              \
1161                                                                             \
1162   develop(bool, TraceCreateZombies, false,                                  \
1163           "trace creation of zombie nmethods")                              \
1164                                                                             \
1165   product(bool, RangeCheckElimination, true,                                \
1166           "Eliminate range checks")                                         \
1167                                                                             \
1168   develop_pd(bool, UncommonNullCast,                                        \
1169           "track occurrences of null in casts; adjust compiler tactics")    \
1170                                                                             \
1171   develop(bool, TypeProfileCasts,  true,                                    \
1172           "treat casts like calls for purposes of type profiling")          \
1173                                                                             \
1174   develop(bool, TraceLivenessGen, false,                                    \
1175           "Trace the generation of liveness analysis information")          \
1176                                                                             \
1177   notproduct(bool, TraceLivenessQuery, false,                               \
1178           "Trace queries of liveness analysis information")                 \
1179                                                                             \
1180   notproduct(bool, CollectIndexSetStatistics, false,                        \
1181           "Collect information about IndexSets")                            \
1182                                                                             \
1183   develop(bool, UseLoopSafepoints, true,                                    \
1184           "Generate Safepoint nodes in every loop")                         \
1185                                                                             \
1186   develop(intx, FastAllocateSizeLimit, 128*K,                               \
1187           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
1188           "Inline allocations larger than this in doublewords must go slow")\
1189                                                                             \
1190   product_pd(bool, CompactStrings,                                          \
1191           "Enable Strings to use single byte chars in backing store")       \
1192                                                                             \
1193   product_pd(uintx, TypeProfileLevel,                                       \
1194           "=XYZ, with Z: Type profiling of arguments at call; "             \
1195                      "Y: Type profiling of return value at call; "          \
1196                      "X: Type profiling of parameters to methods; "         \
1197           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
1198           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
1199                                                                             \
1200   product(intx, TypeProfileArgsLimit,     2,                                \
1201           "max number of call arguments to consider for type profiling")    \
1202           range(0, 16)                                                      \
1203                                                                             \
1204   product(intx, TypeProfileParmsLimit,    2,                                \
1205           "max number of incoming parameters to consider for type profiling"\
1206           ", -1 for all")                                                   \
1207           range(-1, 64)                                                     \
1208                                                                             \
1209   /* statistics */                                                          \
1210   develop(bool, CountCompiledCalls, false,                                  \
1211           "Count method invocations")                                       \
1212                                                                             \
1213   notproduct(bool, CountRuntimeCalls, false,                                \
1214           "Count VM runtime calls")                                         \
1215                                                                             \
1216   develop(bool, CountJNICalls, false,                                       \
1217           "Count jni method invocations")                                   \
1218                                                                             \
1219   notproduct(bool, CountJVMCalls, false,                                    \
1220           "Count jvm method invocations")                                   \
1221                                                                             \
1222   notproduct(bool, CountRemovableExceptions, false,                         \
1223           "Count exceptions that could be replaced by branches due to "     \
1224           "inlining")                                                       \
1225                                                                             \
1226   notproduct(bool, ICMissHistogram, false,                                  \
1227           "Produce histogram of IC misses")                                 \
1228                                                                             \
1229   /* interpreter */                                                         \
1230   product_pd(bool, RewriteBytecodes,                                        \
1231           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
1232                                                                             \
1233   product_pd(bool, RewriteFrequentPairs,                                    \
1234           "Rewrite frequently used bytecode pairs into a single bytecode")  \
1235                                                                             \
1236   diagnostic(bool, PrintInterpreter, false,                                 \
1237           "Print the generated interpreter code")                           \
1238                                                                             \
1239   product(bool, UseInterpreter, true,                                       \
1240           "Use interpreter for non-compiled methods")                       \
1241                                                                             \
1242   develop(bool, UseFastSignatureHandlers, true,                             \
1243           "Use fast signature handlers for native calls")                   \
1244                                                                             \
1245   product(bool, UseLoopCounter, true,                                       \
1246           "Increment invocation counter on backward branch")                \
1247                                                                             \
1248   product_pd(bool, UseOnStackReplacement,                                   \
1249           "Use on stack replacement, calls runtime if invoc. counter "      \
1250           "overflows in loop")                                              \
1251                                                                             \
1252   notproduct(bool, TraceOnStackReplacement, false,                          \
1253           "Trace on stack replacement")                                     \
1254                                                                             \
1255   product_pd(bool, PreferInterpreterNativeStubs,                            \
1256           "Use always interpreter stubs for native methods invoked via "    \
1257           "interpreter")                                                    \
1258                                                                             \
1259   develop(bool, CountBytecodes, false,                                      \
1260           "Count number of bytecodes executed")                             \
1261                                                                             \
1262   develop(bool, PrintBytecodeHistogram, false,                              \
1263           "Print histogram of the executed bytecodes")                      \
1264                                                                             \
1265   develop(bool, PrintBytecodePairHistogram, false,                          \
1266           "Print histogram of the executed bytecode pairs")                 \
1267                                                                             \
1268   diagnostic(bool, PrintSignatureHandlers, false,                           \
1269           "Print code generated for native method signature handlers")      \
1270                                                                             \
1271   develop(bool, VerifyOops, false,                                          \
1272           "Do plausibility checks for oops")                                \
1273                                                                             \
1274   develop(bool, CheckUnhandledOops, false,                                  \
1275           "Check for unhandled oops in VM code")                            \
1276                                                                             \
1277   develop(bool, VerifyJNIFields, trueInDebug,                               \
1278           "Verify jfieldIDs for instance fields")                           \
1279                                                                             \
1280   notproduct(bool, VerifyJNIEnvThread, false,                               \
1281           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
1282           "from JNI")                                                       \
1283                                                                             \
1284   develop(bool, VerifyFPU, false,                                           \
1285           "Verify FPU state (check for NaN's, etc.)")                       \
1286                                                                             \
1287   develop(bool, VerifyThread, false,                                        \
1288           "Watch the thread register for corruption (SPARC only)")          \
1289                                                                             \
1290   develop(bool, VerifyActivationFrameSize, false,                           \
1291           "Verify that activation frame didn't become smaller than its "    \
1292           "minimal size")                                                   \
1293                                                                             \
1294   develop(bool, TraceFrequencyInlining, false,                              \
1295           "Trace frequency based inlining")                                 \
1296                                                                             \
1297   develop_pd(bool, InlineIntrinsics,                                        \
1298           "Inline intrinsics that can be statically resolved")              \
1299                                                                             \
1300   product_pd(bool, ProfileInterpreter,                                      \
1301           "Profile at the bytecode level during interpretation")            \
1302                                                                             \
1303   develop(bool, TraceProfileInterpreter, false,                             \
1304           "Trace profiling at the bytecode level during interpretation. "   \
1305           "This outputs the profiling information collected to improve "    \
1306           "jit compilation.")                                               \
1307                                                                             \
1308   develop_pd(bool, ProfileTraps,                                            \
1309           "Profile deoptimization traps at the bytecode level")             \
1310                                                                             \
1311   product(intx, ProfileMaturityPercentage, 20,                              \
1312           "number of method invocations/branches (expressed as % of "       \
1313           "CompileThreshold) before using the method's profile")            \
1314           range(0, 100)                                                     \
1315                                                                             \
1316   diagnostic(bool, PrintMethodData, false,                                  \
1317           "Print the results of +ProfileInterpreter at end of run")         \
1318                                                                             \
1319   develop(bool, VerifyDataPointer, trueInDebug,                             \
1320           "Verify the method data pointer during interpreter profiling")    \
1321                                                                             \
1322   develop(bool, VerifyCompiledCode, false,                                  \
1323           "Include miscellaneous runtime verifications in nmethod code; "   \
1324           "default off because it disturbs nmethod size heuristics")        \
1325                                                                             \
1326   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
1327           "Manually make GC thread crash then dump java stack trace;  "     \
1328           "Test only")                                                      \
1329                                                                             \
1330   /* compilation */                                                         \
1331   product(bool, UseCompiler, true,                                          \
1332           "Use Just-In-Time compilation")                                   \
1333                                                                             \
1334   product(bool, UseCounterDecay, true,                                      \
1335           "Adjust recompilation counters")                                  \
1336                                                                             \
1337   develop(intx, CounterHalfLifeTime,    30,                                 \
1338           "Half-life time of invocation counters (in seconds)")             \
1339                                                                             \
1340   develop(intx, CounterDecayMinIntervalLength,   500,                       \
1341           "The minimum interval (in milliseconds) between invocation of "   \
1342           "CounterDecay")                                                   \
1343                                                                             \
1344   product(bool, AlwaysCompileLoopMethods, false,                            \
1345           "When using recompilation, never interpret methods "              \
1346           "containing loops")                                               \
1347                                                                             \
1348   product(bool, DontCompileHugeMethods, true,                               \
1349           "Do not compile methods > HugeMethodLimit")                       \
1350                                                                             \
1351   /* Bytecode escape analysis estimation. */                                \
1352   product(bool, EstimateArgEscape, true,                                    \
1353           "Analyze bytecodes to estimate escape state of arguments")        \
1354                                                                             \
1355   product(intx, BCEATraceLevel, 0,                                          \
1356           "How much tracing to do of bytecode escape analysis estimates "   \
1357           "(0-3)")                                                          \
1358           range(0, 3)                                                       \
1359                                                                             \
1360   product(intx, MaxBCEAEstimateLevel, 5,                                    \
1361           "Maximum number of nested calls that are analyzed by BC EA")      \
1362           range(0, max_jint)                                                \
1363                                                                             \
1364   product(intx, MaxBCEAEstimateSize, 150,                                   \
1365           "Maximum bytecode size of a method to be analyzed by BC EA")      \
1366           range(0, max_jint)                                                \
1367                                                                             \
1368   product(intx,  AllocatePrefetchStyle, 1,                                  \
1369           "0 = no prefetch, "                                               \
1370           "1 = generate prefetch instructions for each allocation, "        \
1371           "2 = use TLAB watermark to gate allocation prefetch, "            \
1372           "3 = generate one prefetch instruction per cache line")           \
1373           range(0, 3)                                                       \
1374                                                                             \
1375   product(intx,  AllocatePrefetchDistance, -1,                              \
1376           "Distance to prefetch ahead of allocation pointer. "              \
1377           "-1: use system-specific value (automatically determined")        \
1378           constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\
1379                                                                             \
1380   product(intx,  AllocatePrefetchLines, 3,                                  \
1381           "Number of lines to prefetch ahead of array allocation pointer")  \
1382           range(1, 64)                                                      \
1383                                                                             \
1384   product(intx,  AllocateInstancePrefetchLines, 1,                          \
1385           "Number of lines to prefetch ahead of instance allocation "       \
1386           "pointer")                                                        \
1387           range(1, 64)                                                      \
1388                                                                             \
1389   product(intx,  AllocatePrefetchStepSize, 16,                              \
1390           "Step size in bytes of sequential prefetch instructions")         \
1391           range(1, 512)                                                     \
1392           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1393                                                                             \
1394   product(intx,  AllocatePrefetchInstr, 0,                                  \
1395           "Select instruction to prefetch ahead of allocation pointer")     \
1396           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
1397                                                                             \
1398   /* deoptimization */                                                      \
1399   develop(bool, TraceDeoptimization, false,                                 \
1400           "Trace deoptimization")                                           \
1401                                                                             \
1402   develop(bool, PrintDeoptimizationDetails, false,                          \
1403           "Print more information about deoptimization")                    \
1404                                                                             \
1405   develop(bool, DebugDeoptimization, false,                                 \
1406           "Tracing various information while debugging deoptimization")     \
1407                                                                             \
1408   product(intx, SelfDestructTimer, 0,                                       \
1409           "Will cause VM to terminate after a given time (in minutes) "     \
1410           "(0 means off)")                                                  \
1411           range(0, max_intx)                                                \
1412                                                                             \
1413   product(intx, MaxJavaStackTraceDepth, 1024,                               \
1414           "The maximum number of lines in the stack trace for Java "        \
1415           "exceptions (0 means all)")                                       \
1416           range(0, max_jint/2)                                              \
1417                                                                             \
1418   /* notice: the max range value here is max_jint, not max_intx  */         \
1419   /* because of overflow issue                                   */         \
1420   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
1421           "Guarantee a safepoint (at least) every so many milliseconds "    \
1422           "(0 means none)")                                                 \
1423           range(0, max_jint)                                                \
1424                                                                             \
1425   product(intx, SafepointTimeoutDelay, 10000,                               \
1426           "Delay in milliseconds for option SafepointTimeout")              \
1427   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
1428   NOT_LP64(range(0, max_intx))                                              \
1429                                                                             \
1430   product(intx, NmethodSweepActivity, 10,                                   \
1431           "Removes cold nmethods from code cache if > 0. Higher values "    \
1432           "result in more aggressive sweeping")                             \
1433           range(0, 2000)                                                    \
1434                                                                             \
1435   notproduct(bool, LogSweeper, false,                                       \
1436           "Keep a ring buffer of sweeper activity")                         \
1437                                                                             \
1438   notproduct(intx, SweeperLogEntries, 1024,                                 \
1439           "Number of records in the ring buffer of sweeper activity")       \
1440                                                                             \
1441   notproduct(intx, MemProfilingInterval, 500,                               \
1442           "Time between each invocation of the MemProfiler")                \
1443                                                                             \
1444   develop(intx, MallocCatchPtr, -1,                                         \
1445           "Hit breakpoint when mallocing/freeing this pointer")             \
1446                                                                             \
1447   notproduct(ccstrlist, SuppressErrorAt, "",                                \
1448           "List of assertions (file:line) to muzzle")                       \
1449                                                                             \
1450   develop(intx, StackPrintLimit, 100,                                       \
1451           "number of stack frames to print in VM-level stack dump")         \
1452                                                                             \
1453   notproduct(intx, MaxElementPrintSize, 256,                                \
1454           "maximum number of elements to print")                            \
1455                                                                             \
1456   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
1457           "maximum number of subklasses to print when printing klass")      \
1458                                                                             \
1459   product(intx, MaxInlineLevel, 15,                                         \
1460           "maximum number of nested calls that are inlined")                \
1461           range(0, max_jint)                                                \
1462                                                                             \
1463   product(intx, MaxRecursiveInlineLevel, 1,                                 \
1464           "maximum number of nested recursive calls that are inlined")      \
1465           range(0, max_jint)                                                \
1466                                                                             \
1467   develop(intx, MaxForceInlineLevel, 100,                                   \
1468           "maximum number of nested calls that are forced for inlining "    \
1469           "(using CompileCommand or marked w/ @ForceInline)")               \
1470           range(0, max_jint)                                                \
1471                                                                             \
1472   product_pd(intx, InlineSmallCode,                                         \
1473           "Only inline already compiled methods if their code size is "     \
1474           "less than this")                                                 \
1475           range(0, max_jint)                                                \
1476                                                                             \
1477   product(intx, MaxInlineSize, 35,                                          \
1478           "The maximum bytecode size of a method to be inlined")            \
1479           range(0, max_jint)                                                \
1480                                                                             \
1481   product_pd(intx, FreqInlineSize,                                          \
1482           "The maximum bytecode size of a frequent method to be inlined")   \
1483           range(0, max_jint)                                                \
1484                                                                             \
1485   product(intx, MaxTrivialSize, 6,                                          \
1486           "The maximum bytecode size of a trivial method to be inlined")    \
1487           range(0, max_jint)                                                \
1488                                                                             \
1489   product(intx, MinInliningThreshold, 250,                                  \
1490           "The minimum invocation count a method needs to have to be "      \
1491           "inlined")                                                        \
1492           range(0, max_jint)                                                \
1493                                                                             \
1494   develop(intx, MethodHistogramCutoff, 100,                                 \
1495           "The cutoff value for method invocation histogram (+CountCalls)") \
1496                                                                             \
1497   develop(intx, DontYieldALotInterval,    10,                               \
1498           "Interval between which yields will be dropped (milliseconds)")   \
1499                                                                             \
1500   notproduct(intx, DeoptimizeALotInterval,     5,                           \
1501           "Number of exits until DeoptimizeALot kicks in")                  \
1502                                                                             \
1503   notproduct(intx, ZombieALotInterval,     5,                               \
1504           "Number of exits until ZombieALot kicks in")                      \
1505                                                                             \
1506   diagnostic(uintx, MallocMaxTestWords,     0,                              \
1507           "If non-zero, maximum number of words that malloc/realloc can "   \
1508           "allocate (for testing only)")                                    \
1509           range(0, max_uintx)                                               \
1510                                                                             \
1511   product(intx, TypeProfileWidth, 2,                                        \
1512           "Number of receiver types to record in call/cast profile")        \
1513           range(0, 8)                                                       \
1514                                                                             \
1515   develop(intx, BciProfileWidth,      2,                                    \
1516           "Number of return bci's to record in ret profile")                \
1517                                                                             \
1518   product(intx, PerMethodRecompilationCutoff, 400,                          \
1519           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1520           range(-1, max_intx)                                               \
1521                                                                             \
1522   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
1523           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
1524           range(-1, max_intx)                                               \
1525                                                                             \
1526   product(intx, PerMethodTrapLimit,  100,                                   \
1527           "Limit on traps (of one kind) in a method (includes inlines)")    \
1528           range(0, max_jint)                                                \
1529                                                                             \
1530   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
1531           "Limit on speculative traps (of one kind) in a method "           \
1532           "(includes inlines)")                                             \
1533           range(0, max_jint)                                                \
1534                                                                             \
1535   product(intx, PerBytecodeTrapLimit,  4,                                   \
1536           "Limit on traps (of one kind) at a particular BCI")               \
1537           range(0, max_jint)                                                \
1538                                                                             \
1539   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
1540           "Extra method data trap entries for speculation")                 \
1541                                                                             \
1542   develop(intx, InlineFrequencyRatio,    20,                                \
1543           "Ratio of call site execution to caller method invocation")       \
1544           range(0, max_jint)                                                \
1545                                                                             \
1546   diagnostic_pd(intx, InlineFrequencyCount,                                 \
1547           "Count of call site execution necessary to trigger frequent "     \
1548           "inlining")                                                       \
1549           range(0, max_jint)                                                \
1550                                                                             \
1551   develop(intx, InlineThrowCount,    50,                                    \
1552           "Force inlining of interpreted methods that throw this often")    \
1553           range(0, max_jint)                                                \
1554                                                                             \
1555   develop(intx, InlineThrowMaxSize,   200,                                  \
1556           "Force inlining of throwing methods smaller than this")           \
1557           range(0, max_jint)                                                \
1558                                                                             \
1559   develop(intx, ProfilerNodeSize,  1024,                                    \
1560           "Size in K to allocate for the Profile Nodes of each thread")     \
1561           range(0, 1024)                                                    \
1562                                                                             \
1563   product_pd(size_t, MetaspaceSize,                                         \
1564           "Initial threshold (in bytes) at which a garbage collection "     \
1565           "is done to reduce Metaspace usage")                              \
1566           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
1567                                                                             \
1568   product(size_t, MaxMetaspaceSize, max_uintx,                              \
1569           "Maximum size of Metaspaces (in bytes)")                          \
1570           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
1571                                                                             \
1572   product(size_t, CompressedClassSpaceSize, 1*G,                            \
1573           "Maximum size of class area in Metaspace when compressed "        \
1574           "class pointers are used")                                        \
1575           range(1*M, 3*G)                                                   \
1576                                                                             \
1577   manageable(uintx, MinHeapFreeRatio, 40,                                   \
1578           "The minimum percentage of heap free after GC to avoid expansion."\
1579           " For most GCs this applies to the old generation. In G1 and"     \
1580           " ParallelGC it applies to the whole heap.")                      \
1581           range(0, 100)                                                     \
1582           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
1583                                                                             \
1584   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
1585           "The maximum percentage of heap free after GC to avoid shrinking."\
1586           " For most GCs this applies to the old generation. In G1 and"     \
1587           " ParallelGC it applies to the whole heap.")                      \
1588           range(0, 100)                                                     \
1589           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
1590                                                                             \
1591   product(bool, ShrinkHeapInSteps, true,                                    \
1592           "When disabled, informs the GC to shrink the java heap directly"  \
1593           " to the target size at the next full GC rather than requiring"   \
1594           " smaller steps during multiple full GCs.")                       \
1595                                                                             \
1596   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
1597           "Number of milliseconds per MB of free space in the heap")        \
1598           range(0, max_intx)                                                \
1599           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1600                                                                             \
1601   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
1602           "The minimum change in heap space due to GC (in bytes)")          \
1603           range(0, max_uintx)                                               \
1604                                                                             \
1605   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
1606           "The minimum expansion of Metaspace (in bytes)")                  \
1607           range(0, max_uintx)                                               \
1608                                                                             \
1609   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
1610           "The maximum percentage of Metaspace free after GC to avoid "     \
1611           "shrinking")                                                      \
1612           range(0, 100)                                                     \
1613           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1614                                                                             \
1615   product(uintx, MinMetaspaceFreeRatio,    40,                              \
1616           "The minimum percentage of Metaspace free after GC to avoid "     \
1617           "expansion")                                                      \
1618           range(0, 99)                                                      \
1619           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1620                                                                             \
1621   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
1622           "The maximum expansion of Metaspace without full GC (in bytes)")  \
1623           range(0, max_uintx)                                               \
1624                                                                             \
1625   /* stack parameters */                                                    \
1626   product_pd(intx, StackYellowPages,                                        \
1627           "Number of yellow zone (recoverable overflows) pages of size "    \
1628           "4KB. If pages are bigger yellow zone is aligned up.")            \
1629           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
1630                                                                             \
1631   product_pd(intx, StackRedPages,                                           \
1632           "Number of red zone (unrecoverable overflows) pages of size "     \
1633           "4KB. If pages are bigger red zone is aligned up.")               \
1634           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
1635                                                                             \
1636   product_pd(intx, StackReservedPages,                                      \
1637           "Number of reserved zone (reserved to annotated methods) pages"   \
1638           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1639           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1640                                                                             \
1641   product(bool, RestrictReservedStack, true,                                \
1642           "Restrict @ReservedStackAccess to trusted classes")               \
1643                                                                             \
1644   /* greater stack shadow pages can't generate instruction to bang stack */ \
1645   product_pd(intx, StackShadowPages,                                        \
1646           "Number of shadow zone (for overflow checking) pages of size "    \
1647           "4KB. If pages are bigger shadow zone is aligned up. "            \
1648           "This should exceed the depth of the VM and native call stack.")  \
1649           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
1650                                                                             \
1651   product_pd(intx, ThreadStackSize,                                         \
1652           "Thread Stack Size (in Kbytes)")                                  \
1653           range(0, 1 * M)                                                   \
1654                                                                             \
1655   product_pd(intx, VMThreadStackSize,                                       \
1656           "Non-Java Thread Stack Size (in Kbytes)")                         \
1657           range(0, max_intx/(1 * K))                                        \
1658                                                                             \
1659   product_pd(intx, CompilerThreadStackSize,                                 \
1660           "Compiler Thread Stack Size (in Kbytes)")                         \
1661           range(0, max_intx/(1 * K))                                        \
1662                                                                             \
1663   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
1664           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
1665                                                                             \
1666   /* code cache parameters                                    */            \
1667   develop_pd(uintx, CodeCacheSegmentSize,                                   \
1668           "Code cache segment size (in bytes) - smallest unit of "          \
1669           "allocation")                                                     \
1670           range(1, 1024)                                                    \
1671           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
1672                                                                             \
1673   develop_pd(intx, CodeEntryAlignment,                                      \
1674           "Code entry alignment for generated code (in bytes)")             \
1675           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
1676                                                                             \
1677   product_pd(intx, OptoLoopAlignment,                                       \
1678           "Align inner loops to zero relative to this modulus")             \
1679           range(1, 16)                                                      \
1680           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
1681                                                                             \
1682   product_pd(uintx, InitialCodeCacheSize,                                   \
1683           "Initial code cache size (in bytes)")                             \
1684           range(os::vm_page_size(), max_uintx)                              \
1685                                                                             \
1686   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
1687           "Minimum code cache size (in bytes) required to start VM.")       \
1688           range(0, max_uintx)                                               \
1689                                                                             \
1690   product(bool, SegmentedCodeCache, false,                                  \
1691           "Use a segmented code cache")                                     \
1692                                                                             \
1693   product_pd(uintx, ReservedCodeCacheSize,                                  \
1694           "Reserved code cache size (in bytes) - maximum code cache size")  \
1695           range(os::vm_page_size(), max_uintx)                              \
1696                                                                             \
1697   product_pd(uintx, NonProfiledCodeHeapSize,                                \
1698           "Size of code heap with non-profiled methods (in bytes)")         \
1699           range(0, max_uintx)                                               \
1700                                                                             \
1701   product_pd(uintx, ProfiledCodeHeapSize,                                   \
1702           "Size of code heap with profiled methods (in bytes)")             \
1703           range(0, max_uintx)                                               \
1704                                                                             \
1705   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
1706           "Size of code heap with non-nmethods (in bytes)")                 \
1707           range(os::vm_page_size(), max_uintx)                              \
1708                                                                             \
1709   product_pd(uintx, CodeCacheExpansionSize,                                 \
1710           "Code cache expansion size (in bytes)")                           \
1711           range(32*K, max_uintx)                                            \
1712                                                                             \
1713   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
1714           "Minimum number of segments in a code cache block")               \
1715           range(1, 100)                                                     \
1716                                                                             \
1717   notproduct(bool, ExitOnFullCodeCache, false,                              \
1718           "Exit the VM if we fill the code cache")                          \
1719                                                                             \
1720   product(bool, UseCodeCacheFlushing, true,                                 \
1721           "Remove cold/old nmethods from the code cache")                   \
1722                                                                             \
1723   product(uintx, StartAggressiveSweepingAt, 10,                             \
1724           "Start aggressive sweeping if X[%] of the code cache is free."    \
1725           "Segmented code cache: X[%] of the non-profiled heap."            \
1726           "Non-segmented code cache: X[%] of the total code cache")         \
1727           range(0, 100)                                                     \
1728                                                                             \
1729   /* AOT parameters */                                                      \
1730   experimental(bool, UseAOT, false,                                         \
1731           "Use AOT compiled files")                                         \
1732                                                                             \
1733   experimental(ccstrlist, AOTLibrary, NULL,                                 \
1734           "AOT library")                                                    \
1735                                                                             \
1736   experimental(bool, PrintAOT, false,                                       \
1737           "Print used AOT klasses and methods")                             \
1738                                                                             \
1739   notproduct(bool, PrintAOTStatistics, false,                               \
1740           "Print AOT statistics")                                           \
1741                                                                             \
1742   diagnostic(bool, UseAOTStrictLoading, false,                              \
1743           "Exit the VM if any of the AOT libraries has invalid config")     \
1744                                                                             \
1745   product(bool, CalculateClassFingerprint, false,                           \
1746           "Calculate class fingerprint")                                    \
1747                                                                             \
1748   /* interpreter debugging */                                               \
1749   develop(intx, BinarySwitchThreshold, 5,                                   \
1750           "Minimal number of lookupswitch entries for rewriting to binary " \
1751           "switch")                                                         \
1752                                                                             \
1753   develop(intx, StopInterpreterAt, 0,                                       \
1754           "Stop interpreter execution at specified bytecode number")        \
1755                                                                             \
1756   develop(intx, TraceBytecodesAt, 0,                                        \
1757           "Trace bytecodes starting with specified bytecode number")        \
1758                                                                             \
1759   /* compiler interface */                                                  \
1760   develop(intx, CIStart, 0,                                                 \
1761           "The id of the first compilation to permit")                      \
1762                                                                             \
1763   develop(intx, CIStop, max_jint,                                           \
1764           "The id of the last compilation to permit")                       \
1765                                                                             \
1766   develop(intx, CIStartOSR, 0,                                              \
1767           "The id of the first osr compilation to permit "                  \
1768           "(CICountOSR must be on)")                                        \
1769                                                                             \
1770   develop(intx, CIStopOSR, max_jint,                                        \
1771           "The id of the last osr compilation to permit "                   \
1772           "(CICountOSR must be on)")                                        \
1773                                                                             \
1774   develop(intx, CIBreakAtOSR, -1,                                           \
1775           "The id of osr compilation to break at")                          \
1776                                                                             \
1777   develop(intx, CIBreakAt, -1,                                              \
1778           "The id of compilation to break at")                              \
1779                                                                             \
1780   product(ccstrlist, CompileOnly, "",                                       \
1781           "List of methods (pkg/class.name) to restrict compilation to")    \
1782                                                                             \
1783   product(ccstr, CompileCommandFile, NULL,                                  \
1784           "Read compiler commands from this file [.hotspot_compiler]")      \
1785                                                                             \
1786   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
1787           "Read compiler directives from this file")                        \
1788                                                                             \
1789   product(ccstrlist, CompileCommand, "",                                    \
1790           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
1791                                                                             \
1792   develop(bool, ReplayCompiles, false,                                      \
1793           "Enable replay of compilations from ReplayDataFile")              \
1794                                                                             \
1795   product(ccstr, ReplayDataFile, NULL,                                      \
1796           "File containing compilation replay information"                  \
1797           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
1798                                                                             \
1799    product(ccstr, InlineDataFile, NULL,                                     \
1800           "File containing inlining replay information"                     \
1801           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
1802                                                                             \
1803   develop(intx, ReplaySuppressInitializers, 2,                              \
1804           "Control handling of class initialization during replay: "        \
1805           "0 - don't do anything special; "                                 \
1806           "1 - treat all class initializers as empty; "                     \
1807           "2 - treat class initializers for application classes as empty; " \
1808           "3 - allow all class initializers to run during bootstrap but "   \
1809           "    pretend they are empty after starting replay")               \
1810           range(0, 3)                                                       \
1811                                                                             \
1812   develop(bool, ReplayIgnoreInitErrors, false,                              \
1813           "Ignore exceptions thrown during initialization for replay")      \
1814                                                                             \
1815   product(bool, DumpReplayDataOnError, true,                                \
1816           "Record replay data for crashing compiler threads")               \
1817                                                                             \
1818   product(bool, CICompilerCountPerCPU, false,                               \
1819           "1 compiler thread for log(N CPUs)")                              \
1820                                                                             \
1821   notproduct(intx, CICrashAt, -1,                                           \
1822           "id of compilation to trigger assert in compiler thread for "     \
1823           "the purpose of testing, e.g. generation of replay data")         \
1824   notproduct(bool, CIObjectFactoryVerify, false,                            \
1825           "enable potentially expensive verification in ciObjectFactory")   \
1826                                                                             \
1827   diagnostic(bool, AbortVMOnCompilationFailure, false,                      \
1828           "Abort VM when method had failed to compile.")                    \
1829                                                                             \
1830   /* Priorities */                                                          \
1831   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
1832                                                                             \
1833   product(intx, ThreadPriorityPolicy, 0,                                    \
1834           "0 : Normal.                                                     "\
1835           "    VM chooses priorities that are appropriate for normal       "\
1836           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
1837           "    to normal native priority. Java priorities below "           \
1838           "    NORM_PRIORITY map to lower native priority values. On       "\
1839           "    Windows applications are allowed to use higher native       "\
1840           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
1841           "    not use the highest possible native priority,               "\
1842           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
1843           "    system threads. On Linux thread priorities are ignored      "\
1844           "    because the OS does not support static priority in          "\
1845           "    SCHED_OTHER scheduling class which is the only choice for   "\
1846           "    non-root, non-realtime applications.                        "\
1847           "1 : Aggressive.                                                 "\
1848           "    Java thread priorities map over to the entire range of      "\
1849           "    native thread priorities. Higher Java thread priorities map "\
1850           "    to higher native thread priorities. This policy should be   "\
1851           "    used with care, as sometimes it can cause performance       "\
1852           "    degradation in the application and/or the entire system. On "\
1853           "    Linux/BSD/macOS this policy requires root privilege or an   "\
1854           "    extended capability.")                                       \
1855           range(0, 1)                                                       \
1856                                                                             \
1857   product(bool, ThreadPriorityVerbose, false,                               \
1858           "Print priority changes")                                         \
1859                                                                             \
1860   product(intx, CompilerThreadPriority, -1,                                 \
1861           "The native priority at which compiler threads should run "       \
1862           "(-1 means no change)")                                           \
1863           range(min_jint, max_jint)                                         \
1864           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
1865                                                                             \
1866   product(intx, VMThreadPriority, -1,                                       \
1867           "The native priority at which the VM thread should run "          \
1868           "(-1 means no change)")                                           \
1869           range(-1, 127)                                                    \
1870                                                                             \
1871   product(intx, JavaPriority1_To_OSPriority, -1,                            \
1872           "Map Java priorities to OS priorities")                           \
1873           range(-1, 127)                                                    \
1874                                                                             \
1875   product(intx, JavaPriority2_To_OSPriority, -1,                            \
1876           "Map Java priorities to OS priorities")                           \
1877           range(-1, 127)                                                    \
1878                                                                             \
1879   product(intx, JavaPriority3_To_OSPriority, -1,                            \
1880           "Map Java priorities to OS priorities")                           \
1881           range(-1, 127)                                                    \
1882                                                                             \
1883   product(intx, JavaPriority4_To_OSPriority, -1,                            \
1884           "Map Java priorities to OS priorities")                           \
1885           range(-1, 127)                                                    \
1886                                                                             \
1887   product(intx, JavaPriority5_To_OSPriority, -1,                            \
1888           "Map Java priorities to OS priorities")                           \
1889           range(-1, 127)                                                    \
1890                                                                             \
1891   product(intx, JavaPriority6_To_OSPriority, -1,                            \
1892           "Map Java priorities to OS priorities")                           \
1893           range(-1, 127)                                                    \
1894                                                                             \
1895   product(intx, JavaPriority7_To_OSPriority, -1,                            \
1896           "Map Java priorities to OS priorities")                           \
1897           range(-1, 127)                                                    \
1898                                                                             \
1899   product(intx, JavaPriority8_To_OSPriority, -1,                            \
1900           "Map Java priorities to OS priorities")                           \
1901           range(-1, 127)                                                    \
1902                                                                             \
1903   product(intx, JavaPriority9_To_OSPriority, -1,                            \
1904           "Map Java priorities to OS priorities")                           \
1905           range(-1, 127)                                                    \
1906                                                                             \
1907   product(intx, JavaPriority10_To_OSPriority,-1,                            \
1908           "Map Java priorities to OS priorities")                           \
1909           range(-1, 127)                                                    \
1910                                                                             \
1911   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
1912           "Java thread priority 10 maps to critical scheduling priority")   \
1913                                                                             \
1914   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
1915           "Compiler thread(s) run at critical scheduling priority")         \
1916                                                                             \
1917   develop(intx, NewCodeParameter,      0,                                   \
1918           "Testing Only: Create a dedicated integer parameter before "      \
1919           "putback")                                                        \
1920                                                                             \
1921   /* new oopmap storage allocation */                                       \
1922   develop(intx, MinOopMapAllocation,     8,                                 \
1923           "Minimum number of OopMap entries in an OopMapSet")               \
1924                                                                             \
1925   /* Background Compilation */                                              \
1926   develop(intx, LongCompileThreshold,     50,                               \
1927           "Used with +TraceLongCompiles")                                   \
1928                                                                             \
1929   /* recompilation */                                                       \
1930   product_pd(intx, CompileThreshold,                                        \
1931           "number of interpreted method invocations before (re-)compiling") \
1932           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
1933                                                                             \
1934   product(double, CompileThresholdScaling, 1.0,                             \
1935           "Factor to control when first compilation happens "               \
1936           "(both with and without tiered compilation): "                    \
1937           "values greater than 1.0 delay counter overflow, "                \
1938           "values between 0 and 1.0 rush counter overflow, "                \
1939           "value of 1.0 leaves compilation thresholds unchanged "           \
1940           "value of 0.0 is equivalent to -Xint. "                           \
1941           ""                                                                \
1942           "Flag can be set as per-method option. "                          \
1943           "If a value is specified for a method, compilation thresholds "   \
1944           "for that method are scaled by both the value of the global flag "\
1945           "and the value of the per-method flag.")                          \
1946           range(0.0, DBL_MAX)                                               \
1947                                                                             \
1948   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
1949           "Interpreter (tier 0) invocation notification frequency")         \
1950           range(0, 30)                                                      \
1951                                                                             \
1952   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
1953           "C1 without MDO (tier 2) invocation notification frequency")      \
1954           range(0, 30)                                                      \
1955                                                                             \
1956   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
1957           "C1 with MDO profiling (tier 3) invocation notification "         \
1958           "frequency")                                                      \
1959           range(0, 30)                                                      \
1960                                                                             \
1961   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
1962           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
1963           range(0, 30)                                                      \
1964                                                                             \
1965   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
1966           "Interpreter (tier 0) invocation notification frequency")         \
1967           range(0, 30)                                                      \
1968                                                                             \
1969   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
1970           "C1 without MDO (tier 2) invocation notification frequency")      \
1971           range(0, 30)                                                      \
1972                                                                             \
1973   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
1974           "C1 with MDO profiling (tier 3) invocation notification "         \
1975           "frequency")                                                      \
1976           range(0, 30)                                                      \
1977                                                                             \
1978   product(intx, Tier2CompileThreshold, 0,                                   \
1979           "threshold at which tier 2 compilation is invoked")               \
1980           range(0, max_jint)                                                \
1981                                                                             \
1982   product(intx, Tier2BackEdgeThreshold, 0,                                  \
1983           "Back edge threshold at which tier 2 compilation is invoked")     \
1984           range(0, max_jint)                                                \
1985                                                                             \
1986   product(intx, Tier3InvocationThreshold, 200,                              \
1987           "Compile if number of method invocations crosses this "           \
1988           "threshold")                                                      \
1989           range(0, max_jint)                                                \
1990                                                                             \
1991   product(intx, Tier3MinInvocationThreshold, 100,                           \
1992           "Minimum invocation to compile at tier 3")                        \
1993           range(0, max_jint)                                                \
1994                                                                             \
1995   product(intx, Tier3CompileThreshold, 2000,                                \
1996           "Threshold at which tier 3 compilation is invoked (invocation "   \
1997           "minimum must be satisfied)")                                     \
1998           range(0, max_jint)                                                \
1999                                                                             \
2000   product(intx, Tier3BackEdgeThreshold,  60000,                             \
2001           "Back edge threshold at which tier 3 OSR compilation is invoked") \
2002           range(0, max_jint)                                                \
2003                                                                             \
2004   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
2005           "Compile if number of method invocations crosses this "           \
2006           "threshold if coming from AOT")                                   \
2007           range(0, max_jint)                                                \
2008                                                                             \
2009   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
2010           "Minimum invocation to compile at tier 3 if coming from AOT")     \
2011           range(0, max_jint)                                                \
2012                                                                             \
2013   product(intx, Tier3AOTCompileThreshold, 15000,                            \
2014           "Threshold at which tier 3 compilation is invoked (invocation "   \
2015           "minimum must be satisfied) if coming from AOT")                  \
2016           range(0, max_jint)                                                \
2017                                                                             \
2018   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
2019           "Back edge threshold at which tier 3 OSR compilation is invoked " \
2020           "if coming from AOT")                                             \
2021           range(0, max_jint)                                                \
2022                                                                             \
2023   diagnostic(intx, Tier0AOTInvocationThreshold, 200,                        \
2024           "Switch to interpreter to profile if the number of method "       \
2025           "invocations crosses this threshold if coming from AOT "          \
2026           "(applicable only with "                                          \
2027           "CompilationMode=high-only|high-only-quick-internal)")            \
2028           range(0, max_jint)                                                \
2029                                                                             \
2030   diagnostic(intx, Tier0AOTMinInvocationThreshold, 100,                     \
2031           "Minimum number of invocations to switch to interpreter "         \
2032           "to profile if coming from AOT "                                  \
2033           "(applicable only with "                                          \
2034           "CompilationMode=high-only|high-only-quick-internal)")            \
2035           range(0, max_jint)                                                \
2036                                                                             \
2037   diagnostic(intx, Tier0AOTCompileThreshold, 2000,                          \
2038           "Threshold at which to switch to interpreter to profile "         \
2039           "if coming from AOT "                                             \
2040           "(invocation minimum must be satisfied, "                         \
2041           "applicable only with "                                           \
2042           "CompilationMode=high-only|high-only-quick-internal)")            \
2043           range(0, max_jint)                                                \
2044                                                                             \
2045   diagnostic(intx, Tier0AOTBackEdgeThreshold,  60000,                       \
2046           "Back edge threshold at which to switch to interpreter "          \
2047           "to profile if coming from AOT "                                  \
2048           "(applicable only with "                                          \
2049           "CompilationMode=high-only|high-only-quick-internal)")            \
2050           range(0, max_jint)                                                \
2051                                                                             \
2052   product(intx, Tier4InvocationThreshold, 5000,                             \
2053           "Compile if number of method invocations crosses this "           \
2054           "threshold")                                                      \
2055           range(0, max_jint)                                                \
2056                                                                             \
2057   product(intx, Tier4MinInvocationThreshold, 600,                           \
2058           "Minimum invocation to compile at tier 4")                        \
2059           range(0, max_jint)                                                \
2060                                                                             \
2061   product(intx, Tier4CompileThreshold, 15000,                               \
2062           "Threshold at which tier 4 compilation is invoked (invocation "   \
2063           "minimum must be satisfied)")                                     \
2064           range(0, max_jint)                                                \
2065                                                                             \
2066   product(intx, Tier4BackEdgeThreshold, 40000,                              \
2067           "Back edge threshold at which tier 4 OSR compilation is invoked") \
2068           range(0, max_jint)                                                \
2069                                                                             \
2070   diagnostic(intx, Tier40InvocationThreshold, 5000,                         \
2071           "Compile if number of method invocations crosses this "           \
2072           "threshold (applicable only with "                                \
2073           "CompilationMode=high-only|high-only-quick-internal)")            \
2074           range(0, max_jint)                                                \
2075                                                                             \
2076   diagnostic(intx, Tier40MinInvocationThreshold, 600,                       \
2077           "Minimum number of invocations to compile at tier 4 "             \
2078           "(applicable only with "                                          \
2079           "CompilationMode=high-only|high-only-quick-internal)")            \
2080           range(0, max_jint)                                                \
2081                                                                             \
2082   diagnostic(intx, Tier40CompileThreshold, 10000,                           \
2083           "Threshold at which tier 4 compilation is invoked (invocation "   \
2084           "minimum must be satisfied, applicable only with "                \
2085           "CompilationMode=high-only|high-only-quick-internal)")            \
2086           range(0, max_jint)                                                \
2087                                                                             \
2088   diagnostic(intx, Tier40BackEdgeThreshold, 15000,                          \
2089           "Back edge threshold at which tier 4 OSR compilation is invoked " \
2090           "(applicable only with "                                          \
2091           "CompilationMode=high-only|high-only-quick-internal)")            \
2092           range(0, max_jint)                                                \
2093                                                                             \
2094   diagnostic(intx, Tier0Delay, 5,                                           \
2095           "If C2 queue size grows over this amount per compiler thread "    \
2096           "do not start profiling in the interpreter "                      \
2097           "(applicable only with "                                          \
2098           "CompilationMode=high-only|high-only-quick-internal)")            \
2099           range(0, max_jint)                                                \
2100                                                                             \
2101   product(intx, Tier3DelayOn, 5,                                            \
2102           "If C2 queue size grows over this amount per compiler thread "    \
2103           "stop compiling at tier 3 and start compiling at tier 2")         \
2104           range(0, max_jint)                                                \
2105                                                                             \
2106   product(intx, Tier3DelayOff, 2,                                           \
2107           "If C2 queue size is less than this amount per compiler thread "  \
2108           "allow methods compiled at tier 2 transition to tier 3")          \
2109           range(0, max_jint)                                                \
2110                                                                             \
2111   product(intx, Tier3LoadFeedback, 5,                                       \
2112           "Tier 3 thresholds will increase twofold when C1 queue size "     \
2113           "reaches this amount per compiler thread")                        \
2114           range(0, max_jint)                                                \
2115                                                                             \
2116   product(intx, Tier4LoadFeedback, 3,                                       \
2117           "Tier 4 thresholds will increase twofold when C2 queue size "     \
2118           "reaches this amount per compiler thread")                        \
2119           range(0, max_jint)                                                \
2120                                                                             \
2121   product(intx, TieredCompileTaskTimeout, 50,                               \
2122           "Kill compile task if method was not used within "                \
2123           "given timeout in milliseconds")                                  \
2124           range(0, max_intx)                                                \
2125                                                                             \
2126   product(intx, TieredStopAtLevel, 4,                                       \
2127           "Stop at given compilation level")                                \
2128           range(0, 4)                                                       \
2129                                                                             \
2130   product(intx, Tier0ProfilingStartPercentage, 200,                         \
2131           "Start profiling in interpreter if the counters exceed tier 3 "   \
2132           "thresholds (tier 4 thresholds with "                             \
2133           "CompilationMode=high-only|high-only-quick-internal)"             \
2134           "by the specified percentage")                                    \
2135           range(0, max_jint)                                                \
2136                                                                             \
2137   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
2138           "Increase the compile threshold for C1 compilation if the code "  \
2139           "cache is filled by the specified percentage")                    \
2140           range(0, 99)                                                      \
2141                                                                             \
2142   product(intx, TieredRateUpdateMinTime, 1,                                 \
2143           "Minimum rate sampling interval (in milliseconds)")               \
2144           range(0, max_intx)                                                \
2145                                                                             \
2146   product(intx, TieredRateUpdateMaxTime, 25,                                \
2147           "Maximum rate sampling interval (in milliseconds)")               \
2148           range(0, max_intx)                                                \
2149                                                                             \
2150   product(ccstr, CompilationMode, "default",                                \
2151           "Compilation modes: "                                             \
2152           "default: normal tiered compilation; "                            \
2153           "quick-only: C1-only mode; "                                      \
2154           "high-only: C2/JVMCI-only mode; "                                 \
2155           "high-only-quick-internal: C2/JVMCI-only mode, "                  \
2156           "with JVMCI compiler compiled with C1.")                          \
2157                                                                             \
2158   product_pd(bool, TieredCompilation,                                       \
2159           "Enable tiered compilation")                                      \
2160                                                                             \
2161   product(bool, PrintTieredEvents, false,                                   \
2162           "Print tiered events notifications")                              \
2163                                                                             \
2164   product_pd(intx, OnStackReplacePercentage,                                \
2165           "NON_TIERED number of method invocations/branches (expressed as " \
2166           "% of CompileThreshold) before (re-)compiling OSR code")          \
2167           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
2168                                                                             \
2169   product(intx, InterpreterProfilePercentage, 33,                           \
2170           "NON_TIERED number of method invocations/branches (expressed as " \
2171           "% of CompileThreshold) before profiling in the interpreter")     \
2172           range(0, 100)                                                     \
2173                                                                             \
2174   develop(intx, DesiredMethodLimit,  8000,                                  \
2175           "The desired maximum method size (in bytecodes) after inlining")  \
2176                                                                             \
2177   develop(intx, HugeMethodLimit,  8000,                                     \
2178           "Don't compile methods larger than this if "                      \
2179           "+DontCompileHugeMethods")                                        \
2180                                                                             \
2181   /* Properties for Java libraries  */                                      \
2182                                                                             \
2183   product(uint64_t, MaxDirectMemorySize, 0,                                 \
2184           "Maximum total size of NIO direct-buffer allocations")            \
2185           range(0, max_jlong)                                               \
2186                                                                             \
2187   /* Flags used for temporary code during development  */                   \
2188                                                                             \
2189   diagnostic(bool, UseNewCode, false,                                       \
2190           "Testing Only: Use the new version while testing")                \
2191                                                                             \
2192   diagnostic(bool, UseNewCode2, false,                                      \
2193           "Testing Only: Use the new version while testing")                \
2194                                                                             \
2195   diagnostic(bool, UseNewCode3, false,                                      \
2196           "Testing Only: Use the new version while testing")                \
2197                                                                             \
2198   /* flags for performance data collection */                               \
2199                                                                             \
2200   product(bool, UsePerfData, true,                                          \
2201           "Flag to disable jvmstat instrumentation for performance testing "\
2202           "and problem isolation purposes")                                 \
2203                                                                             \
2204   product(bool, PerfDataSaveToFile, false,                                  \
2205           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
2206                                                                             \
2207   product(ccstr, PerfDataSaveFile, NULL,                                    \
2208           "Save PerfData memory to the specified absolute pathname. "       \
2209           "The string %p in the file name (if present) "                    \
2210           "will be replaced by pid")                                        \
2211                                                                             \
2212   product(intx, PerfDataSamplingInterval, 50,                               \
2213           "Data sampling interval (in milliseconds)")                       \
2214           range(PeriodicTask::min_interval, max_jint)                       \
2215           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
2216                                                                             \
2217   product(bool, PerfDisableSharedMem, false,                                \
2218           "Store performance data in standard memory")                      \
2219                                                                             \
2220   product(intx, PerfDataMemorySize, 32*K,                                   \
2221           "Size of performance data memory region. Will be rounded "        \
2222           "up to a multiple of the native os page size.")                   \
2223           range(128, 32*64*K)                                               \
2224                                                                             \
2225   product(intx, PerfMaxStringConstLength, 1024,                             \
2226           "Maximum PerfStringConstant string length before truncation")     \
2227           range(32, 32*K)                                                   \
2228                                                                             \
2229   product(bool, PerfAllowAtExitRegistration, false,                         \
2230           "Allow registration of atexit() methods")                         \
2231                                                                             \
2232   product(bool, PerfBypassFileSystemCheck, false,                           \
2233           "Bypass Win32 file system criteria checks (Windows Only)")        \
2234                                                                             \
2235   product(intx, UnguardOnExecutionViolation, 0,                             \
2236           "Unguard page and retry on no-execute fault (Win32 only) "        \
2237           "0=off, 1=conservative, 2=aggressive")                            \
2238           range(0, 2)                                                       \
2239                                                                             \
2240   /* Serviceability Support */                                              \
2241                                                                             \
2242   product(bool, ManagementServer, false,                                    \
2243           "Create JMX Management Server")                                   \
2244                                                                             \
2245   product(bool, DisableAttachMechanism, false,                              \
2246           "Disable mechanism that allows tools to attach to this VM")       \
2247                                                                             \
2248   product(bool, StartAttachListener, false,                                 \
2249           "Always start Attach Listener at VM startup")                     \
2250                                                                             \
2251   product(bool, EnableDynamicAgentLoading, true,                            \
2252           "Allow tools to load agents with the attach mechanism")           \
2253                                                                             \
2254   manageable(bool, PrintConcurrentLocks, false,                             \
2255           "Print java.util.concurrent locks in thread dump")                \
2256                                                                             \
2257   /* Shared spaces */                                                       \
2258                                                                             \
2259   product(bool, UseSharedSpaces, true,                                      \
2260           "Use shared spaces for metadata")                                 \
2261                                                                             \
2262   product(bool, VerifySharedSpaces, false,                                  \
2263           "Verify integrity of shared spaces")                              \
2264                                                                             \
2265   product(bool, RequireSharedSpaces, false,                                 \
2266           "Require shared spaces for metadata")                             \
2267                                                                             \
2268   product(bool, DumpSharedSpaces, false,                                    \
2269           "Special mode: JVM reads a class list, loads classes, builds "    \
2270           "shared spaces, and dumps the shared spaces to a file to be "     \
2271           "used in future JVM runs")                                        \
2272                                                                             \
2273   product(bool, DynamicDumpSharedSpaces, false,                             \
2274           "Dynamic archive")                                                \
2275                                                                             \
2276   product(bool, PrintSharedArchiveAndExit, false,                           \
2277           "Print shared archive file contents")                             \
2278                                                                             \
2279   product(bool, PrintSharedDictionary, false,                               \
2280           "If PrintSharedArchiveAndExit is true, also print the shared "    \
2281           "dictionary")                                                     \
2282                                                                             \
2283   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
2284           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
2285           "Address to allocate shared memory region for class data")        \
2286           range(0, SIZE_MAX)                                                \
2287                                                                             \
2288   product(ccstr, SharedArchiveConfigFile, NULL,                             \
2289           "Data to add to the CDS archive file")                            \
2290                                                                             \
2291   product(uintx, SharedSymbolTableBucketSize, 4,                            \
2292           "Average number of symbols per bucket in shared table")           \
2293           range(2, 246)                                                     \
2294                                                                             \
2295   diagnostic(bool, AllowArchivingWithJavaAgent, false,                      \
2296           "Allow Java agent to be run with CDS dumping")                    \
2297                                                                             \
2298   diagnostic(bool, PrintMethodHandleStubs, false,                           \
2299           "Print generated stub code for method handles")                   \
2300                                                                             \
2301   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
2302           "perform extra checks when constructing method handles")          \
2303                                                                             \
2304   diagnostic(bool, ShowHiddenFrames, false,                                 \
2305           "show method handle implementation frames (usually hidden)")      \
2306                                                                             \
2307   experimental(bool, TrustFinalNonStaticFields, false,                      \
2308           "trust final non-static declarations for constant folding")       \
2309                                                                             \
2310   diagnostic(bool, FoldStableValues, true,                                  \
2311           "Optimize loads from stable fields (marked w/ @Stable)")          \
2312                                                                             \
2313   diagnostic(int, UseBootstrapCallInfo, 1,                                  \
2314           "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2315           "resolved before the bootstrap method is called; 1: when a BSM "  \
2316           "that may accept a BootstrapCallInfo is detected, use that API "  \
2317           "to pass BSM arguments, which allows the BSM to delay their "     \
2318           "resolution; 2+: stress test the BCI API by calling more BSMs "   \
2319           "via that API, instead of with the eagerly-resolved array.")      \
2320                                                                             \
2321   diagnostic(bool, PauseAtStartup,      false,                              \
2322           "Causes the VM to pause at startup time and wait for the pause "  \
2323           "file to be removed (default: ./vm.paused.<pid>)")                \
2324                                                                             \
2325   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
2326           "The file to create and for whose removal to await when pausing " \
2327           "at startup. (default: ./vm.paused.<pid>)")                       \
2328                                                                             \
2329   diagnostic(bool, PauseAtExit, false,                                      \
2330           "Pause and wait for keypress on exit if a debugger is attached")  \
2331                                                                             \
2332   product(bool, ExtendedDTraceProbes,    false,                             \
2333           "Enable performance-impacting dtrace probes")                     \
2334                                                                             \
2335   product(bool, DTraceMethodProbes, false,                                  \
2336           "Enable dtrace probes for method-entry and method-exit")          \
2337                                                                             \
2338   product(bool, DTraceAllocProbes, false,                                   \
2339           "Enable dtrace probes for object allocation")                     \
2340                                                                             \
2341   product(bool, DTraceMonitorProbes, false,                                 \
2342           "Enable dtrace probes for monitor events")                        \
2343                                                                             \
2344   product(bool, RelaxAccessControlCheck, false,                             \
2345           "Relax the access control checks in the verifier")                \
2346                                                                             \
2347   product(uintx, StringTableSize, defaultStringTableSize,                   \
2348           "Number of buckets in the interned String table "                 \
2349           "(will be rounded to nearest higher power of 2)")                 \
2350           range(minimumStringTableSize, 16777216ul /* 2^24 */)              \
2351                                                                             \
2352   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
2353           "Number of buckets in the JVM internal Symbol table")             \
2354           range(minimumSymbolTableSize, 16777216ul /* 2^24 */)              \
2355                                                                             \
2356   product(bool, UseStringDeduplication, false,                              \
2357           "Use string deduplication")                                       \
2358                                                                             \
2359   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
2360           "A string must reach this age (or be promoted to an old region) " \
2361           "to be considered for deduplication")                             \
2362           range(1, markWord::max_age)                                       \
2363                                                                             \
2364   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
2365           "Force table resize every time the table is scanned")             \
2366                                                                             \
2367   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
2368           "Force table rehash every time the table is scanned")             \
2369                                                                             \
2370   diagnostic(bool, WhiteBoxAPI, false,                                      \
2371           "Enable internal testing APIs")                                   \
2372                                                                             \
2373   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
2374            "Default survivor space alignment in bytes")                     \
2375            range(8, 256)                                                    \
2376            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
2377                                                                             \
2378   product(ccstr, DumpLoadedClassList, NULL,                                 \
2379           "Dump the names all loaded classes, that could be stored into "   \
2380           "the CDS archive, in the specified file")                         \
2381                                                                             \
2382   product(ccstr, SharedClassListFile, NULL,                                 \
2383           "Override the default CDS class list")                            \
2384                                                                             \
2385   product(ccstr, SharedArchiveFile, NULL,                                   \
2386           "Override the default location of the CDS archive file")          \
2387                                                                             \
2388   product(ccstr, ArchiveClassesAtExit, NULL,                                \
2389           "The path and name of the dynamic archive file")                  \
2390                                                                             \
2391   product(ccstr, ExtraSharedClassListFile, NULL,                            \
2392           "Extra classlist for building the CDS archive file")              \
2393                                                                             \
2394   diagnostic(intx, ArchiveRelocationMode, 0,                                \
2395            "(0) first map at preferred address, and if "                    \
2396            "unsuccessful, map at alternative address (default); "           \
2397            "(1) always map at alternative address; "                        \
2398            "(2) always map at preferred address, and if unsuccessful, "     \
2399            "do not map the archive")                                        \
2400            range(0, 2)                                                      \
2401                                                                             \
2402   experimental(size_t, ArrayAllocatorMallocLimit,                           \
2403           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
2404           "Allocation less than this value will be allocated "              \
2405           "using malloc. Larger allocations will use mmap.")                \
2406                                                                             \
2407   experimental(bool, AlwaysAtomicAccesses, false,                           \
2408           "Accesses to all variables should always be atomic")              \
2409                                                                             \
2410   diagnostic(bool, UseUnalignedAccesses, false,                             \
2411           "Use unaligned memory accesses in Unsafe")                        \
2412                                                                             \
2413   product_pd(bool, PreserveFramePointer,                                    \
2414              "Use the FP register for holding the frame pointer "           \
2415              "and not as a general purpose register.")                      \
2416                                                                             \
2417   diagnostic(bool, CheckIntrinsics, true,                                   \
2418              "When a class C is loaded, check that "                        \
2419              "(1) all intrinsics defined by the VM for class C are present "\
2420              "in the loaded class file and are marked with the "            \
2421              "@HotSpotIntrinsicCandidate annotation, that "                 \
2422              "(2) there is an intrinsic registered for all loaded methods " \
2423              "that are annotated with the @HotSpotIntrinsicCandidate "      \
2424              "annotation, and that "                                        \
2425              "(3) no orphan methods exist for class C (i.e., methods for "  \
2426              "which the VM declares an intrinsic but that are not declared "\
2427              "in the loaded class C. "                                      \
2428              "Check (3) is available only in debug builds.")                \
2429                                                                             \
2430   diagnostic_pd(intx, InitArrayShortSize,                                   \
2431           "Threshold small size (in bytes) for clearing arrays. "           \
2432           "Anything this size or smaller may get converted to discrete "    \
2433           "scalar stores.")                                                 \
2434           range(0, max_intx)                                                \
2435           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
2436                                                                             \
2437   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
2438              "Disable backwards compatibility for compile commands.")       \
2439                                                                             \
2440   diagnostic(bool, CompilerDirectivesPrint, false,                          \
2441              "Print compiler directives on installation.")                  \
2442   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
2443              "Limit on number of compiler directives.")                     \
2444                                                                             \
2445   product(ccstr, AllocateHeapAt, NULL,                                      \
2446           "Path to the directoy where a temporary file will be created "    \
2447           "to use as the backing store for Java Heap.")                     \
2448                                                                             \
2449   experimental(ccstr, AllocateOldGenAt, NULL,                               \
2450           "Path to the directoy where a temporary file will be "            \
2451           "created to use as the backing store for old generation."         \
2452           "File of size Xmx is pre-allocated for performance reason, so"    \
2453           "we need that much space available")                              \
2454                                                                             \
2455   develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0),       \
2456                "Run periodic metaspace verifications (0 - none, "           \
2457                "1 - always, >1 every nth interval)")                        \
2458                                                                             \
2459   diagnostic(bool, ShowRegistersOnAssert, true,                             \
2460           "On internal errors, include registers in error report.")         \
2461                                                                             \
2462   diagnostic(bool, UseSwitchProfiling, true,                                \
2463           "leverage profiling for table/lookup switch")                     \
2464                                                                             \
2465   develop(bool, TraceMemoryWriteback, false,                                \
2466           "Trace memory writeback operations")                              \
2467                                                                             \
2468   JFR_ONLY(product(bool, FlightRecorder, false,                             \
2469           "(Deprecated) Enable Flight Recorder"))                           \
2470                                                                             \
2471   JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL,                      \
2472           "Flight Recorder options"))                                       \
2473                                                                             \
2474   JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
2475           "Start flight recording with options"))                           \
2476                                                                             \
2477   experimental(bool, UseFastUnorderedTimeStamps, false,                     \
2478           "Use platform unstable time where supported for timestamps only") \
2479                                                                             \
2480   product(bool, UseNewFieldLayout, true,                                    \
2481                "(Deprecated) Use new algorithm to compute field layouts")   \
2482                                                                             \
2483   product(bool, UseEmptySlotsInSupers, true,                                \
2484                 "Allow allocating fields in empty slots of super-classes")  \
2485                                                                             \
2486   diagnostic(bool, DeoptimizeNMethodBarriersALot, false,                    \
2487                 "Make nmethod barriers deoptimise a lot.")                  \
2488 
2489 // Interface macros
2490 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
2491 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
2492 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
2493 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
2494 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
2495 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
2496 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
2497 #ifdef PRODUCT
2498 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
2499 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
2500 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
2501 #else
2502 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
2503 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
2504 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
2505 #endif // PRODUCT
2506 // Special LP64 flags, product only needed for now.
2507 #ifdef _LP64
2508 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2509 #else
2510 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
2511 #endif // _LP64
2512 
2513 ALL_FLAGS(DECLARE_DEVELOPER_FLAG,     \
2514           DECLARE_PD_DEVELOPER_FLAG,  \
2515           DECLARE_PRODUCT_FLAG,       \
2516           DECLARE_PD_PRODUCT_FLAG,    \
2517           DECLARE_DIAGNOSTIC_FLAG,    \
2518           DECLARE_PD_DIAGNOSTIC_FLAG, \
2519           DECLARE_EXPERIMENTAL_FLAG,  \
2520           DECLARE_NOTPRODUCT_FLAG,    \
2521           DECLARE_MANAGEABLE_FLAG,    \
2522           DECLARE_PRODUCT_RW_FLAG,    \
2523           DECLARE_LP64_PRODUCT_FLAG,  \
2524           IGNORE_RANGE,               \
2525           IGNORE_CONSTRAINT)
2526 
2527 #endif // SHARE_RUNTIME_GLOBALS_HPP
--- EOF ---