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