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   notproduct(bool, PrintRewrites, false,                                    \
 309           "Print methods that are being rewritten")                         \
 310                                                                             \
 311   product(bool, UseInlineCaches, true,                                      \
 312           "Use Inline Caches for virtual calls ")                           \
 313                                                                             \
 314   diagnostic(bool, InlineArrayCopy, true,                                   \
 315           "Inline arraycopy native that is known to be part of "            \
 316           "base library DLL")                                               \
 317                                                                             \
 318   diagnostic(bool, InlineObjectHash, true,                                  \
 319           "Inline Object::hashCode() native that is known to be part "      \
 320           "of base library DLL")                                            \
 321                                                                             \
 322   diagnostic(bool, InlineNatives, true,                                     \
 323           "Inline natives that are known to be part of base library DLL")   \
 324                                                                             \
 325   diagnostic(bool, InlineMathNatives, true,                                 \
 326           "Inline SinD, CosD, etc.")                                        \
 327                                                                             \
 328   diagnostic(bool, InlineClassNatives, true,                                \
 329           "Inline Class.isInstance, etc")                                   \
 330                                                                             \
 331   diagnostic(bool, InlineThreadNatives, true,                               \
 332           "Inline Thread.currentThread, etc")                               \
 333                                                                             \
 334   diagnostic(bool, InlineUnsafeOps, true,                                   \
 335           "Inline memory ops (native methods) from Unsafe")                 \
 336                                                                             \
 337   product(bool, CriticalJNINatives, true,                                   \
 338           "Check for critical JNI entry points")                            \
 339                                                                             \
 340   notproduct(bool, StressCriticalJNINatives, false,                         \
 341           "Exercise register saving code in critical natives")              \
 342                                                                             \
 343   diagnostic(bool, UseAESIntrinsics, false,                                 \
 344           "Use intrinsics for AES versions of crypto")                      \
 345                                                                             \
 346   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 347           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 348                                                                             \
 349   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 350           "Use intrinsics for SHA-1 crypto hash function. "                 \
 351           "Requires that UseSHA is enabled.")                               \
 352                                                                             \
 353   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 354           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 355           "Requires that UseSHA is enabled.")                               \
 356                                                                             \
 357   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 358           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 359           "Requires that UseSHA is enabled.")                               \
 360                                                                             \
 361   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 362           "use intrinsics for java.util.zip.CRC32")                         \
 363                                                                             \
 364   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 365           "use intrinsics for java.util.zip.CRC32C")                        \
 366                                                                             \
 367   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 368           "use intrinsics for java.util.zip.Adler32")                       \
 369                                                                             \
 370   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 371           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 372                                                                             \
 373   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 374          "do not expand intrinsics whose (internal) names appear here")     \
 375                                                                             \
 376   develop(bool, TraceCallFixup, false,                                      \
 377           "Trace all call fixups")                                          \
 378                                                                             \
 379   develop(bool, DeoptimizeALot, false,                                      \
 380           "Deoptimize at every exit from the runtime system")               \
 381                                                                             \
 382   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 383           "A comma separated list of bcis to deoptimize at")                \
 384                                                                             \
 385   develop(bool, DeoptimizeRandom, false,                                    \
 386           "Deoptimize random frames on random exit from the runtime system")\
 387                                                                             \
 388   notproduct(bool, ZombieALot, false,                                       \
 389           "Create zombies (non-entrant) at exit from the runtime system")   \
 390                                                                             \
 391   notproduct(bool, WalkStackALot, false,                                    \
 392           "Trace stack (no print) at every exit from the runtime system")   \
 393                                                                             \
 394   product(bool, Debugging, false,                                           \
 395           "Set when executing debug methods in debug.cpp "                  \
 396           "(to prevent triggering assertions)")                             \
 397                                                                             \
 398   notproduct(bool, VerifyLastFrame, false,                                  \
 399           "Verify oops on last frame on entry to VM")                       \
 400                                                                             \
 401   product(bool, SafepointTimeout, false,                                    \
 402           "Time out and warn or fail after SafepointTimeoutDelay "          \
 403           "milliseconds if failed to reach safepoint")                      \
 404                                                                             \
 405   diagnostic(bool, AbortVMOnSafepointTimeout, false,                        \
 406           "Abort upon failure to reach safepoint (see SafepointTimeout)")   \
 407                                                                             \
 408   diagnostic(bool, AbortVMOnVMOperationTimeout, false,                      \
 409           "Abort upon failure to complete VM operation promptly")           \
 410                                                                             \
 411   diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000,                  \
 412           "Delay in milliseconds for option AbortVMOnVMOperationTimeout")   \
 413           range(0, max_intx)                                                \
 414                                                                             \
 415   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 416   /* typically, at most a few retries are needed                    */      \
 417   product(intx, SuspendRetryCount, 50,                                      \
 418           "Maximum retry count for an external suspend request")            \
 419           range(0, max_intx)                                                \
 420                                                                             \
 421   product(intx, SuspendRetryDelay, 5,                                       \
 422           "Milliseconds to delay per retry (* current_retry_count)")        \
 423           range(0, max_intx)                                                \
 424                                                                             \
 425   product(bool, AssertOnSuspendWaitFailure, false,                          \
 426           "Assert/Guarantee on external suspend wait failure")              \
 427                                                                             \
 428   product(bool, TraceSuspendWaitFailures, false,                            \
 429           "Trace external suspend wait failures")                           \
 430                                                                             \
 431   product(bool, MaxFDLimit, true,                                           \
 432           "Bump the number of file descriptors to maximum in Solaris")      \
 433                                                                             \
 434   diagnostic(bool, LogEvents, true,                                         \
 435           "Enable the various ring buffer event logs")                      \
 436                                                                             \
 437   diagnostic(uintx, LogEventsBufferEntries, 20,                             \
 438           "Number of ring buffer event logs")                               \
 439           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 440                                                                             \
 441   diagnostic(bool, BytecodeVerificationRemote, true,                        \
 442           "Enable the Java bytecode verifier for remote classes")           \
 443                                                                             \
 444   diagnostic(bool, BytecodeVerificationLocal, false,                        \
 445           "Enable the Java bytecode verifier for local classes")            \
 446                                                                             \
 447   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 448           "Force exceptions on FP stack under/overflow")                    \
 449                                                                             \
 450   develop(bool, VerifyStackAtCalls, false,                                  \
 451           "Verify that the stack pointer is unchanged after calls")         \
 452                                                                             \
 453   develop(bool, TraceJavaAssertions, false,                                 \
 454           "Trace java language assertions")                                 \
 455                                                                             \
 456   notproduct(bool, VerifyCodeCache, false,                                  \
 457           "Verify code cache on memory allocation/deallocation")            \
 458                                                                             \
 459   develop(bool, UseMallocOnly, false,                                       \
 460           "Use only malloc/free for allocation (no resource area/arena)")   \
 461                                                                             \
 462   develop(bool, ZapResourceArea, trueInDebug,                               \
 463           "Zap freed resource/arena space with 0xABABABAB")                 \
 464                                                                             \
 465   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 466           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 467                                                                             \
 468   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 469           "Zap allocated/freed stack segments with 0xFADFADED")             \
 470                                                                             \
 471   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 472           "Zap unused heap space with 0xBAADBABE")                          \
 473                                                                             \
 474   develop(bool, CheckZapUnusedHeapArea, false,                              \
 475           "Check zapping of unused heap space")                             \
 476                                                                             \
 477   develop(bool, ZapFillerObjects, trueInDebug,                              \
 478           "Zap filler objects with 0xDEAFBABE")                             \
 479                                                                             \
 480   develop(bool, PrintVMMessages, true,                                      \
 481           "Print VM messages on console")                                   \
 482                                                                             \
 483   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 484           "If > 0, provokes an error after VM initialization; the value "   \
 485           "determines which error to provoke. See test_error_handler() "    \
 486           "in vmError.cpp.")                                                \
 487                                                                             \
 488   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 489           "If > 0, provokes an error inside VM error handler (a secondary " \
 490           "crash). see test_error_handler() in vmError.cpp")                \
 491                                                                             \
 492   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 493           "If true, tests SafeFetch inside error handler.")                 \
 494                                                                             \
 495   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 496           "If true, simulates an unresponsive error handler.")              \
 497                                                                             \
 498   develop(bool, Verbose, false,                                             \
 499           "Print additional debugging information from other modes")        \
 500                                                                             \
 501   develop(bool, PrintMiscellaneous, false,                                  \
 502           "Print uncategorized debugging information (requires +Verbose)")  \
 503                                                                             \
 504   develop(bool, WizardMode, false,                                          \
 505           "Print much more debugging information")                          \
 506                                                                             \
 507   product(bool, ShowMessageBoxOnError, false,                               \
 508           "Keep process alive on VM fatal error")                           \
 509                                                                             \
 510   product(bool, CreateCoredumpOnCrash, true,                                \
 511           "Create core/mini dump on VM fatal error")                        \
 512                                                                             \
 513   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 514           "Timeout, in seconds, to limit the time spent on writing an "     \
 515           "error log in case of a crash.")                                  \
 516           range(0, (uint64_t)max_jlong/1000)                                \
 517                                                                             \
 518   product_pd(bool, UseOSErrorReporting,                                     \
 519           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 520                                                                             \
 521   product(bool, SuppressFatalErrorMessage, false,                           \
 522           "Report NO fatal error message (avoid deadlock)")                 \
 523                                                                             \
 524   product(ccstrlist, OnError, "",                                           \
 525           "Run user-defined commands on fatal error; see VMError.cpp "      \
 526           "for examples")                                                   \
 527                                                                             \
 528   product(ccstrlist, OnOutOfMemoryError, "",                                \
 529           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 530                                                                             \
 531   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 532           "Dump heap to file before any major stop-the-world GC")           \
 533                                                                             \
 534   manageable(bool, HeapDumpAfterFullGC, false,                              \
 535           "Dump heap to file after any major stop-the-world GC")            \
 536                                                                             \
 537   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 538           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 539                                                                             \
 540   manageable(ccstr, HeapDumpPath, NULL,                                     \
 541           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 542           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 543           "in the working directory)")                                      \
 544                                                                             \
 545   develop(bool, BreakAtWarning, false,                                      \
 546           "Execute breakpoint upon encountering VM warning")                \
 547                                                                             \
 548   product(ccstr, NativeMemoryTracking, "off",                               \
 549           "Native memory tracking options")                                 \
 550                                                                             \
 551   diagnostic(bool, PrintNMTStatistics, false,                               \
 552           "Print native memory tracking summary data if it is on")          \
 553                                                                             \
 554   diagnostic(bool, LogCompilation, false,                                   \
 555           "Log compilation activity in detail to LogFile")                  \
 556                                                                             \
 557   product(bool, PrintCompilation, false,                                    \
 558           "Print compilations")                                             \
 559                                                                             \
 560   product(bool, PrintExtendedThreadInfo, false,                             \
 561           "Print more information in thread dump")                          \
 562                                                                             \
 563   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 564           "0: do not allow scavengable oops in the code cache; "            \
 565           "1: allow scavenging from the code cache; "                       \
 566           "2: emit as many constants as the compiler can see")              \
 567           range(0, 2)                                                       \
 568                                                                             \
 569   product(bool, AlwaysRestoreFPU, false,                                    \
 570           "Restore the FPU control word after every JNI call (expensive)")  \
 571                                                                             \
 572   diagnostic(bool, PrintCompilation2, false,                                \
 573           "Print additional statistics per compilation")                    \
 574                                                                             \
 575   diagnostic(bool, PrintAdapterHandlers, false,                             \
 576           "Print code generated for i2c/c2i adapters")                      \
 577                                                                             \
 578   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 579           "Verify that i2c/c2i adapters are called properly")               \
 580                                                                             \
 581   develop(bool, VerifyAdapterSharing, false,                                \
 582           "Verify that the code for shared adapters is the equivalent")     \
 583                                                                             \
 584   diagnostic(bool, PrintAssembly, false,                                    \
 585           "Print assembly code (using external disassembler.so)")           \
 586                                                                             \
 587   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 588           "Print options string passed to disassembler.so")                 \
 589                                                                             \
 590   notproduct(bool, PrintNMethodStatistics, false,                           \
 591           "Print a summary statistic for the generated nmethods")           \
 592                                                                             \
 593   diagnostic(bool, PrintNMethods, false,                                    \
 594           "Print assembly code for nmethods when generated")                \
 595                                                                             \
 596   diagnostic(bool, PrintNativeNMethods, false,                              \
 597           "Print assembly code for native nmethods when generated")         \
 598                                                                             \
 599   develop(bool, PrintDebugInfo, false,                                      \
 600           "Print debug information for all nmethods when generated")        \
 601                                                                             \
 602   develop(bool, PrintRelocations, false,                                    \
 603           "Print relocation information for all nmethods when generated")   \
 604                                                                             \
 605   develop(bool, PrintDependencies, false,                                   \
 606           "Print dependency information for all nmethods when generated")   \
 607                                                                             \
 608   develop(bool, PrintExceptionHandlers, false,                              \
 609           "Print exception handler tables for all nmethods when generated") \
 610                                                                             \
 611   develop(bool, StressCompiledExceptionHandlers, false,                     \
 612           "Exercise compiled exception handlers")                           \
 613                                                                             \
 614   develop(bool, InterceptOSException, false,                                \
 615           "Start debugger when an implicit OS (e.g. NULL) "                 \
 616           "exception happens")                                              \
 617                                                                             \
 618   product(bool, PrintCodeCache, false,                                      \
 619           "Print the code cache memory usage when exiting")                 \
 620                                                                             \
 621   develop(bool, PrintCodeCache2, false,                                     \
 622           "Print detailed usage information on the code cache when exiting")\
 623                                                                             \
 624   product(bool, PrintCodeCacheOnCompilation, false,                         \
 625           "Print the code cache memory usage each time a method is "        \
 626           "compiled")                                                       \
 627                                                                             \
 628   diagnostic(bool, PrintCodeHeapAnalytics, false,                           \
 629           "Print code heap usage statistics on exit and on full condition") \
 630                                                                             \
 631   diagnostic(bool, PrintStubCode, false,                                    \
 632           "Print generated stub code")                                      \
 633                                                                             \
 634   product(bool, StackTraceInThrowable, true,                                \
 635           "Collect backtrace in throwable when exception happens")          \
 636                                                                             \
 637   product(bool, OmitStackTraceInFastThrow, true,                            \
 638           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 639                                                                             \
 640   manageable(bool, ShowCodeDetailsInExceptionMessages, false,               \
 641           "Show exception messages from RuntimeExceptions that contain "    \
 642           "snippets of the failing code. Disable this to improve privacy.") \
 643                                                                             \
 644   product(bool, PrintWarnings, true,                                        \
 645           "Print JVM warnings to output stream")                            \
 646                                                                             \
 647   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 648           "Print warnings for stalled SpinLocks")                           \
 649                                                                             \
 650   product(bool, RegisterFinalizersAtInit, true,                             \
 651           "Register finalizable objects at end of Object.<init> or "        \
 652           "after allocation")                                               \
 653                                                                             \
 654   develop(bool, RegisterReferences, true,                                   \
 655           "Tell whether the VM should register soft/weak/final/phantom "    \
 656           "references")                                                     \
 657                                                                             \
 658   develop(bool, IgnoreRewrites, false,                                      \
 659           "Suppress rewrites of bytecodes in the oopmap generator. "        \
 660           "This is unsafe!")                                                \
 661                                                                             \
 662   develop(bool, PrintCodeCacheExtension, false,                             \
 663           "Print extension of code cache")                                  \
 664                                                                             \
 665   develop(bool, UsePrivilegedStack, true,                                   \
 666           "Enable the security JVM functions")                              \
 667                                                                             \
 668   develop(bool, ProtectionDomainVerification, true,                         \
 669           "Verify protection domain before resolution in system dictionary")\
 670                                                                             \
 671   product(bool, ClassUnloading, true,                                       \
 672           "Do unloading of classes")                                        \
 673                                                                             \
 674   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
 675           "Do unloading of classes with a concurrent marking cycle")        \
 676                                                                             \
 677   develop(bool, DisableStartThread, false,                                  \
 678           "Disable starting of additional Java threads "                    \
 679           "(for debugging only)")                                           \
 680                                                                             \
 681   develop(bool, MemProfiling, false,                                        \
 682           "Write memory usage profiling to log file")                       \
 683                                                                             \
 684   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 685           "Print the system dictionary at exit")                            \
 686                                                                             \
 687   diagnostic(bool, DynamicallyResizeSystemDictionaries, true,               \
 688           "Dynamically resize system dictionaries as needed")               \
 689                                                                             \
 690   product(bool, AlwaysLockClassLoader, false,                               \
 691           "Require the VM to acquire the class loader lock before calling " \
 692           "loadClass() even for class loaders registering "                 \
 693           "as parallel capable")                                            \
 694                                                                             \
 695   product(bool, AllowParallelDefineClass, false,                            \
 696           "Allow parallel defineClass requests for class loaders "          \
 697           "registering as parallel capable")                                \
 698                                                                             \
 699   product_pd(bool, DontYieldALot,                                           \
 700           "Throw away obvious excess yield calls")                          \
 701                                                                             \
 702   develop(bool, UseDetachedThreads, true,                                   \
 703           "Use detached threads that are recycled upon termination "        \
 704           "(for Solaris only)")                                             \
 705                                                                             \
 706   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
 707                "Disable the use of stack guard pages if the JVM is loaded " \
 708                "on the primordial process thread")                          \
 709                                                                             \
 710   product(bool, UseLWPSynchronization, true,                                \
 711           "Use LWP-based instead of libthread-based synchronization "       \
 712           "(SPARC only)")                                                   \
 713                                                                             \
 714   product(intx, MonitorBound, 0, "(Deprecated) Bound Monitor population")   \
 715           range(0, max_jint)                                                \
 716                                                                             \
 717   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
 718                 "Percentage of used monitors before triggering cleanup "    \
 719                 "safepoint which deflates monitors (0 is off). "            \
 720                 "The check is performed on GuaranteedSafepointInterval.")   \
 721                 range(0, 100)                                               \
 722                                                                             \
 723   experimental(intx, hashCode, 5,                                           \
 724                "(Unstable) select hashCode generation algorithm")           \
 725                                                                             \
 726   product(bool, FilterSpuriousWakeups, true,                                \
 727           "When true prevents OS-level spurious, or premature, wakeups "    \
 728           "from Object.wait (Ignored for Windows)")                         \
 729                                                                             \
 730   develop(bool, UsePthreads, false,                                         \
 731           "Use pthread-based instead of libthread-based synchronization "   \
 732           "(SPARC only)")                                                   \
 733                                                                             \
 734   product(bool, ReduceSignalUsage, false,                                   \
 735           "Reduce the use of OS signals in Java and/or the VM")             \
 736                                                                             \
 737   develop(bool, LoadLineNumberTables, true,                                 \
 738           "Tell whether the class file parser loads line number tables")    \
 739                                                                             \
 740   develop(bool, LoadLocalVariableTables, true,                              \
 741           "Tell whether the class file parser loads local variable tables") \
 742                                                                             \
 743   develop(bool, LoadLocalVariableTypeTables, true,                          \
 744           "Tell whether the class file parser loads local variable type"    \
 745           "tables")                                                         \
 746                                                                             \
 747   product(bool, AllowUserSignalHandlers, false,                             \
 748           "Do not complain if the application installs signal handlers "    \
 749           "(Solaris & Linux only)")                                         \
 750                                                                             \
 751   product(bool, UseSignalChaining, true,                                    \
 752           "Use signal-chaining to invoke signal handlers installed "        \
 753           "by the application (Solaris & Linux only)")                      \
 754                                                                             \
 755   product(bool, RestoreMXCSROnJNICalls, false,                              \
 756           "Restore MXCSR when returning from JNI calls")                    \
 757                                                                             \
 758   product(bool, CheckJNICalls, false,                                       \
 759           "Verify all arguments to JNI calls")                              \
 760                                                                             \
 761   product(bool, UseFastJNIAccessors, true,                                  \
 762           "Use optimized versions of Get<Primitive>Field")                  \
 763                                                                             \
 764   product(intx, MaxJNILocalCapacity, 65536,                                 \
 765           "Maximum allowable local JNI handle capacity to "                 \
 766           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
 767           "where <= 0 is unlimited, default: 65536")                        \
 768           range(min_intx, max_intx)                                         \
 769                                                                             \
 770   product(bool, EagerXrunInit, false,                                       \
 771           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 772           "but not all -Xrun libraries may support the state of the VM "    \
 773           "at this time")                                                   \
 774                                                                             \
 775   product(bool, PreserveAllAnnotations, false,                              \
 776           "Preserve RuntimeInvisibleAnnotations as well "                   \
 777           "as RuntimeVisibleAnnotations")                                   \
 778                                                                             \
 779   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 780           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 781                                                                             \
 782   product(bool, UseXMMForArrayCopy, false,                                  \
 783           "Use SSE2 MOVQ instruction for Arraycopy")                        \
 784                                                                             \
 785   product(intx, FieldsAllocationStyle, 1,                                   \
 786           "(Deprecated) 0 - type based with oops first, "                   \
 787           "1 - with oops last, "                                            \
 788           "2 - oops in super and sub classes are together")                 \
 789           range(0, 2)                                                       \
 790                                                                             \
 791   product(bool, CompactFields, true,                                        \
 792           "(Deprecated) Allocate nonstatic fields in gaps "                 \
 793           "between previous fields")                                        \
 794                                                                             \
 795   notproduct(bool, PrintFieldLayout, false,                                 \
 796           "Print field layout for each class")                              \
 797                                                                             \
 798   /* Need to limit the extent of the padding to reasonable size.          */\
 799   /* 8K is well beyond the reasonable HW cache line size, even with       */\
 800   /* aggressive prefetching, while still leaving the room for segregating */\
 801   /* among the distinct pages.                                            */\
 802   product(intx, ContendedPaddingWidth, 128,                                 \
 803           "How many bytes to pad the fields/classes marked @Contended with")\
 804           range(0, 8192)                                                    \
 805           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
 806                                                                             \
 807   product(bool, EnableContended, true,                                      \
 808           "Enable @Contended annotation support")                           \
 809                                                                             \
 810   product(bool, RestrictContended, true,                                    \
 811           "Restrict @Contended to trusted classes")                         \
 812                                                                             \
 813   product(bool, UseBiasedLocking, true,                                     \
 814           "Enable biased locking in JVM")                                   \
 815                                                                             \
 816   product(intx, BiasedLockingStartupDelay, 0,                               \
 817           "Number of milliseconds to wait before enabling biased locking")  \
 818           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
 819           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
 820                                                                             \
 821   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
 822           "Print statistics of biased locking in JVM")                      \
 823                                                                             \
 824   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
 825           "Threshold of number of revocations per type to try to "          \
 826           "rebias all objects in the heap of that type")                    \
 827           range(0, max_intx)                                                \
 828           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
 829                                                                             \
 830   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
 831           "Threshold of number of revocations per type to permanently "     \
 832           "revoke biases of all objects in the heap of that type")          \
 833           range(0, max_intx)                                                \
 834           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
 835                                                                             \
 836   product(intx, BiasedLockingDecayTime, 25000,                              \
 837           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
 838           "type after previous bulk rebias")                                \
 839           range(500, max_intx)                                              \
 840           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
 841                                                                             \
 842   product(bool, ExitOnOutOfMemoryError, false,                              \
 843           "JVM exits on the first occurrence of an out-of-memory error")    \
 844                                                                             \
 845   product(bool, CrashOnOutOfMemoryError, false,                             \
 846           "JVM aborts, producing an error log and core/mini dump, on the "  \
 847           "first occurrence of an out-of-memory error")                     \
 848                                                                             \
 849   /* tracing */                                                             \
 850                                                                             \
 851   develop(bool, StressRewriter, false,                                      \
 852           "Stress linktime bytecode rewriting")                             \
 853                                                                             \
 854   product(ccstr, TraceJVMTI, NULL,                                          \
 855           "Trace flags for JVMTI functions and events")                     \
 856                                                                             \
 857   /* This option can change an EMCP method into an obsolete method. */      \
 858   /* This can affect tests that except specific methods to be EMCP. */      \
 859   /* This option should be used with caution.                       */      \
 860   product(bool, StressLdcRewrite, false,                                    \
 861           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
 862                                                                             \
 863   /* change to false by default sometime after Mustang */                   \
 864   product(bool, VerifyMergedCPBytecodes, true,                              \
 865           "Verify bytecodes after RedefineClasses constant pool merging")   \
 866                                                                             \
 867   product(bool, AllowRedefinitionToAddDeleteMethods, false,                 \
 868           "(Deprecated) Allow redefinition to add and delete private "      \
 869           "static or final methods for compatibility with old releases")    \
 870                                                                             \
 871   develop(bool, TraceBytecodes, false,                                      \
 872           "Trace bytecode execution")                                       \
 873                                                                             \
 874   develop(bool, TraceICs, false,                                            \
 875           "Trace inline cache changes")                                     \
 876                                                                             \
 877   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
 878           "Trace method invocation counter overflow")                       \
 879                                                                             \
 880   develop(bool, TraceInlineCacheClearing, false,                            \
 881           "Trace clearing of inline caches in nmethods")                    \
 882                                                                             \
 883   develop(bool, TraceDependencies, false,                                   \
 884           "Trace dependencies")                                             \
 885                                                                             \
 886   develop(bool, VerifyDependencies, trueInDebug,                            \
 887           "Exercise and verify the compilation dependency mechanism")       \
 888                                                                             \
 889   develop(bool, TraceNewOopMapGeneration, false,                            \
 890           "Trace OopMapGeneration")                                         \
 891                                                                             \
 892   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
 893           "Trace OopMapGeneration: print detailed cell states")             \
 894                                                                             \
 895   develop(bool, TimeOopMap, false,                                          \
 896           "Time calls to GenerateOopMap::compute_map() in sum")             \
 897                                                                             \
 898   develop(bool, TimeOopMap2, false,                                         \
 899           "Time calls to GenerateOopMap::compute_map() individually")       \
 900                                                                             \
 901   develop(bool, TraceOopMapRewrites, false,                                 \
 902           "Trace rewriting of method oops during oop map generation")       \
 903                                                                             \
 904   develop(bool, TraceICBuffer, false,                                       \
 905           "Trace usage of IC buffer")                                       \
 906                                                                             \
 907   develop(bool, TraceCompiledIC, false,                                     \
 908           "Trace changes of compiled IC")                                   \
 909                                                                             \
 910   develop(bool, FLSVerifyDictionary, false,                                 \
 911           "Do lots of (expensive) FLS dictionary verification")             \
 912                                                                             \
 913                                                                             \
 914   notproduct(bool, CheckMemoryInitialization, false,                        \
 915           "Check memory initialization")                                    \
 916                                                                             \
 917   product(uintx, ProcessDistributionStride, 4,                              \
 918           "Stride through processors when distributing processes")          \
 919           range(0, max_juint)                                               \
 920                                                                             \
 921   develop(bool, TraceFinalizerRegistration, false,                          \
 922           "Trace registration of final references")                         \
 923                                                                             \
 924   product(bool, IgnoreEmptyClassPaths, false,                               \
 925           "Ignore empty path elements in -classpath")                       \
 926                                                                             \
 927   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
 928           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
 929           "Initial size of the boot class loader data metaspace")           \
 930           range(30*K, max_uintx/BytesPerWord)                               \
 931           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
 932                                                                             \
 933   product(bool, PrintHeapAtSIGBREAK, true,                                  \
 934           "Print heap layout in response to SIGBREAK")                      \
 935                                                                             \
 936   manageable(bool, PrintClassHistogram, false,                              \
 937           "Print a histogram of class instances")                           \
 938                                                                             \
 939   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
 940           "The percentage of the used heap that the instances of a class "  \
 941           "must occupy for the class to generate a trace event")            \
 942           range(0.0, 100.0)                                                 \
 943                                                                             \
 944   /* JVMTI heap profiling */                                                \
 945                                                                             \
 946   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
 947           "Trace JVMTI object tagging calls")                               \
 948                                                                             \
 949   diagnostic(bool, VerifyBeforeIteration, false,                            \
 950           "Verify memory system before JVMTI iteration")                    \
 951                                                                             \
 952   /* compiler interface */                                                  \
 953                                                                             \
 954   develop(bool, CIPrintCompilerName, false,                                 \
 955           "when CIPrint is active, print the name of the active compiler")  \
 956                                                                             \
 957   diagnostic(bool, CIPrintCompileQueue, false,                              \
 958           "display the contents of the compile queue whenever a "           \
 959           "compilation is enqueued")                                        \
 960                                                                             \
 961   develop(bool, CIPrintRequests, false,                                     \
 962           "display every request for compilation")                          \
 963                                                                             \
 964   product(bool, CITime, false,                                              \
 965           "collect timing information for compilation")                     \
 966                                                                             \
 967   develop(bool, CITimeVerbose, false,                                       \
 968           "be more verbose in compilation timings")                         \
 969                                                                             \
 970   develop(bool, CITimeEach, false,                                          \
 971           "display timing information after each successful compilation")   \
 972                                                                             \
 973   develop(bool, CICountOSR, false,                                          \
 974           "use a separate counter when assigning ids to osr compilations")  \
 975                                                                             \
 976   develop(bool, CICompileNatives, true,                                     \
 977           "compile native methods if supported by the compiler")            \
 978                                                                             \
 979   develop_pd(bool, CICompileOSR,                                            \
 980           "compile on stack replacement methods if supported by the "       \
 981           "compiler")                                                       \
 982                                                                             \
 983   develop(bool, CIPrintMethodCodes, false,                                  \
 984           "print method bytecodes of the compiled code")                    \
 985                                                                             \
 986   develop(bool, CIPrintTypeFlow, false,                                     \
 987           "print the results of ciTypeFlow analysis")                       \
 988                                                                             \
 989   develop(bool, CITraceTypeFlow, false,                                     \
 990           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
 991                                                                             \
 992   develop(intx, OSROnlyBCI, -1,                                             \
 993           "OSR only at this bci.  Negative values mean exclude that bci")   \
 994                                                                             \
 995   /* compiler */                                                            \
 996                                                                             \
 997   /* notice: the max range value here is max_jint, not max_intx  */         \
 998   /* because of overflow issue                                   */         \
 999   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
1000           "Number of compiler threads to run")                              \
1001           range(0, max_jint)                                                \
1002           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
1003                                                                             \
1004   product(bool, UseDynamicNumberOfCompilerThreads, true,                    \
1005           "Dynamically choose the number of parallel compiler threads")     \
1006                                                                             \
1007   diagnostic(bool, ReduceNumberOfCompilerThreads, true,                     \
1008              "Reduce the number of parallel compiler threads when they "    \
1009              "are not used")                                                \
1010                                                                             \
1011   diagnostic(bool, TraceCompilerThreads, false,                             \
1012              "Trace creation and removal of compiler threads")              \
1013                                                                             \
1014   develop(bool, InjectCompilerCreationFailure, false,                       \
1015           "Inject thread creation failures for "                            \
1016           "UseDynamicNumberOfCompilerThreads")                              \
1017                                                                             \
1018   develop(bool, UseStackBanging, true,                                      \
1019           "use stack banging for stack overflow checks (required for "      \
1020           "proper StackOverflow handling; disable only to measure cost "    \
1021           "of stackbanging)")                                               \
1022                                                                             \
1023   develop(bool, UseStrictFP, true,                                          \
1024           "use strict fp if modifier strictfp is set")                      \
1025                                                                             \
1026   develop(bool, GenerateSynchronizationCode, true,                          \
1027           "generate locking/unlocking code for synchronized methods and "   \
1028           "monitors")                                                       \
1029                                                                             \
1030   develop(bool, GenerateRangeChecks, true,                                  \
1031           "Generate range checks for array accesses")                       \
1032                                                                             \
1033   diagnostic_pd(bool, ImplicitNullChecks,                                   \
1034           "Generate code for implicit null checks")                         \
1035                                                                             \
1036   product_pd(bool, TrapBasedNullChecks,                                     \
1037           "Generate code for null checks that uses a cmp and trap "         \
1038           "instruction raising SIGTRAP.  This is only used if an access to" \
1039           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
1040           "ImplicitNullChecks don't work (PPC64).")                         \
1041                                                                             \
1042   diagnostic(bool, EnableThreadSMRExtraValidityChecks, true,                \
1043              "Enable Thread SMR extra validity checks")                     \
1044                                                                             \
1045   diagnostic(bool, EnableThreadSMRStatistics, trueInDebug,                  \
1046              "Enable Thread SMR Statistics")                                \
1047                                                                             \
1048   product(bool, UseNotificationThread, true,                                \
1049           "Use Notification Thread")                                        \
1050                                                                             \
1051   product(bool, Inline, true,                                               \
1052           "Enable inlining")                                                \
1053                                                                             \
1054   product(bool, ClipInlining, true,                                         \
1055           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
1056                                                                             \
1057   develop(bool, UseCHA, true,                                               \
1058           "Enable CHA")                                                     \
1059                                                                             \
1060   product(bool, UseTypeProfile, true,                                       \
1061           "Check interpreter profile for historically monomorphic calls")   \
1062                                                                             \
1063   diagnostic(bool, PrintInlining, false,                                    \
1064           "Print inlining optimizations")                                   \
1065                                                                             \
1066   product(bool, UsePopCountInstruction, false,                              \
1067           "Use population count instruction")                               \
1068                                                                             \
1069   develop(bool, EagerInitialization, false,                                 \
1070           "Eagerly initialize classes if possible")                         \
1071                                                                             \
1072   diagnostic(bool, LogTouchedMethods, false,                                \
1073           "Log methods which have been ever touched in runtime")            \
1074                                                                             \
1075   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
1076           "Print all methods that have been ever touched in runtime")       \
1077                                                                             \
1078   develop(bool, TraceMethodReplacement, false,                              \
1079           "Print when methods are replaced do to recompilation")            \
1080                                                                             \
1081   develop(bool, PrintMethodFlushing, false,                                 \
1082           "Print the nmethods being flushed")                               \
1083                                                                             \
1084   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
1085           "print statistics about method flushing")                         \
1086                                                                             \
1087   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
1088           "Number of compiled code invocations after which "                \
1089           "the method is considered as hot by the flusher")                 \
1090           range(1, max_jint)                                                \
1091                                                                             \
1092   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
1093           "Minimum number of sweeper passes before an nmethod "             \
1094           "can be flushed")                                                 \
1095           range(0, max_intx)                                                \
1096                                                                             \
1097   product(bool, UseCodeAging, true,                                         \
1098           "Insert counter to detect warm methods")                          \
1099                                                                             \
1100   diagnostic(bool, StressCodeAging, false,                                  \
1101           "Start with counters compiled in")                                \
1102                                                                             \
1103   develop(bool, StressCodeBuffers, false,                                   \
1104           "Exercise code buffer expansion and other rare state changes")    \
1105                                                                             \
1106   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
1107           "Generate extra debugging information for non-safepoints in "     \
1108           "nmethods")                                                       \
1109                                                                             \
1110   product(bool, PrintVMOptions, false,                                      \
1111           "Print flags that appeared on the command line")                  \
1112                                                                             \
1113   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
1114           "Ignore unrecognized VM options")                                 \
1115                                                                             \
1116   product(bool, PrintCommandLineFlags, false,                               \
1117           "Print flags specified on command line or set by ergonomics")     \
1118                                                                             \
1119   product(bool, PrintFlagsInitial, false,                                   \
1120           "Print all VM flags before argument processing and exit VM")      \
1121                                                                             \
1122   product(bool, PrintFlagsFinal, false,                                     \
1123           "Print all VM flags after argument and ergonomic processing")     \
1124                                                                             \
1125   notproduct(bool, PrintFlagsWithComments, false,                           \
1126           "Print all VM flags with default values and descriptions and "    \
1127           "exit")                                                           \
1128                                                                             \
1129   product(bool, PrintFlagsRanges, false,                                    \
1130           "Print VM flags and their ranges")                                \
1131                                                                             \
1132   diagnostic(bool, SerializeVMOutput, true,                                 \
1133           "Use a mutex to serialize output to tty and LogFile")             \
1134                                                                             \
1135   diagnostic(bool, DisplayVMOutput, true,                                   \
1136           "Display all VM output on the tty, independently of LogVMOutput") \
1137                                                                             \
1138   diagnostic(bool, LogVMOutput, false,                                      \
1139           "Save VM output to LogFile")                                      \
1140                                                                             \
1141   diagnostic(ccstr, LogFile, NULL,                                          \
1142           "If LogVMOutput or LogCompilation is on, save VM output to "      \
1143           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1144                                                                             \
1145   product(ccstr, ErrorFile, NULL,                                           \
1146           "If an error occurs, save the error data to this file "           \
1147           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
1148                                                                             \
1149   product(bool, ExtensiveErrorReports,                                      \
1150           PRODUCT_ONLY(false) NOT_PRODUCT(true),                            \
1151           "Error reports are more extensive.")                              \
1152                                                                             \
1153   product(bool, DisplayVMOutputToStderr, false,                             \
1154           "If DisplayVMOutput is true, display all VM output to stderr")    \
1155                                                                             \
1156   product(bool, DisplayVMOutputToStdout, false,                             \
1157           "If DisplayVMOutput is true, display all VM output to stdout")    \
1158                                                                             \
1159   product(bool, ErrorFileToStderr, false,                                   \
1160           "If true, error data is printed to stderr instead of a file")     \
1161                                                                             \
1162   product(bool, ErrorFileToStdout, false,                                   \
1163           "If true, error data is printed to stdout instead of a file")     \
1164                                                                             \
1165   product(bool, UseHeavyMonitors, false,                                    \
1166           "use heavyweight instead of lightweight Java monitors")           \
1167                                                                             \
1168   product(bool, PrintStringTableStatistics, false,                          \
1169           "print statistics about the StringTable and SymbolTable")         \
1170                                                                             \
1171   diagnostic(bool, VerifyStringTableAtExit, false,                          \
1172           "verify StringTable contents at exit")                            \
1173                                                                             \
1174   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
1175           "print histogram of the symbol table")                            \
1176                                                                             \
1177   notproduct(bool, ExitVMOnVerifyError, false,                              \
1178           "standard exit from VM if bytecode verify error "                 \
1179           "(only in debug mode)")                                           \
1180                                                                             \
1181   diagnostic(ccstr, AbortVMOnException, NULL,                               \
1182           "Call fatal if this exception is thrown.  Example: "              \
1183           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1184                                                                             \
1185   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
1186           "Call fatal if the exception pointed by AbortVMOnException "      \
1187           "has this message")                                               \
1188                                                                             \
1189   develop(bool, DebugVtables, false,                                        \
1190           "add debugging code to vtable dispatch")                          \
1191                                                                             \
1192   notproduct(bool, PrintVtableStats, false,                                 \
1193           "print vtables stats at end of run")                              \
1194                                                                             \
1195   develop(bool, TraceCreateZombies, false,                                  \
1196           "trace creation of zombie nmethods")                              \
1197                                                                             \
1198   product(bool, RangeCheckElimination, true,                                \
1199           "Eliminate range checks")                                         \
1200                                                                             \
1201   develop_pd(bool, UncommonNullCast,                                        \
1202           "track occurrences of null in casts; adjust compiler tactics")    \
1203                                                                             \
1204   develop(bool, TypeProfileCasts,  true,                                    \
1205           "treat casts like calls for purposes of type profiling")          \
1206                                                                             \
1207   develop(bool, TraceLivenessGen, false,                                    \
1208           "Trace the generation of liveness analysis information")          \
1209                                                                             \
1210   notproduct(bool, TraceLivenessQuery, false,                               \
1211           "Trace queries of liveness analysis information")                 \
1212                                                                             \
1213   notproduct(bool, CollectIndexSetStatistics, false,                        \
1214           "Collect information about IndexSets")                            \
1215                                                                             \
1216   develop(bool, UseLoopSafepoints, true,                                    \
1217           "Generate Safepoint nodes in every loop")                         \
1218                                                                             \
1219   develop(intx, FastAllocateSizeLimit, 128*K,                               \
1220           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
1221           "Inline allocations larger than this in doublewords must go slow")\
1222                                                                             \
1223   product_pd(bool, CompactStrings,                                          \
1224           "Enable Strings to use single byte chars in backing store")       \
1225                                                                             \
1226   product_pd(uintx, TypeProfileLevel,                                       \
1227           "=XYZ, with Z: Type profiling of arguments at call; "             \
1228                      "Y: Type profiling of return value at call; "          \
1229                      "X: Type profiling of parameters to methods; "         \
1230           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
1231           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
1232                                                                             \
1233   product(intx, TypeProfileArgsLimit,     2,                                \
1234           "max number of call arguments to consider for type profiling")    \
1235           range(0, 16)                                                      \
1236                                                                             \
1237   product(intx, TypeProfileParmsLimit,    2,                                \
1238           "max number of incoming parameters to consider for type profiling"\
1239           ", -1 for all")                                                   \
1240           range(-1, 64)                                                     \
1241                                                                             \
1242   /* statistics */                                                          \
1243   develop(bool, CountCompiledCalls, false,                                  \
1244           "Count method invocations")                                       \
1245                                                                             \
1246   notproduct(bool, CountRuntimeCalls, false,                                \
1247           "Count VM runtime calls")                                         \
1248                                                                             \
1249   develop(bool, CountJNICalls, false,                                       \
1250           "Count jni method invocations")                                   \
1251                                                                             \
1252   notproduct(bool, CountJVMCalls, false,                                    \
1253           "Count jvm method invocations")                                   \
1254                                                                             \
1255   notproduct(bool, CountRemovableExceptions, false,                         \
1256           "Count exceptions that could be replaced by branches due to "     \
1257           "inlining")                                                       \
1258                                                                             \
1259   notproduct(bool, ICMissHistogram, false,                                  \
1260           "Produce histogram of IC misses")                                 \
1261                                                                             \
1262   /* interpreter */                                                         \
1263   product_pd(bool, RewriteBytecodes,                                        \
1264           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
1265                                                                             \
1266   product_pd(bool, RewriteFrequentPairs,                                    \
1267           "Rewrite frequently used bytecode pairs into a single bytecode")  \
1268                                                                             \
1269   diagnostic(bool, PrintInterpreter, false,                                 \
1270           "Print the generated interpreter code")                           \
1271                                                                             \
1272   product(bool, UseInterpreter, true,                                       \
1273           "Use interpreter for non-compiled methods")                       \
1274                                                                             \
1275   develop(bool, UseFastSignatureHandlers, true,                             \
1276           "Use fast signature handlers for native calls")                   \
1277                                                                             \
1278   product(bool, UseLoopCounter, true,                                       \
1279           "Increment invocation counter on backward branch")                \
1280                                                                             \
1281   product_pd(bool, UseOnStackReplacement,                                   \
1282           "Use on stack replacement, calls runtime if invoc. counter "      \
1283           "overflows in loop")                                              \
1284                                                                             \
1285   notproduct(bool, TraceOnStackReplacement, false,                          \
1286           "Trace on stack replacement")                                     \
1287                                                                             \
1288   product_pd(bool, PreferInterpreterNativeStubs,                            \
1289           "Use always interpreter stubs for native methods invoked via "    \
1290           "interpreter")                                                    \
1291                                                                             \
1292   develop(bool, CountBytecodes, false,                                      \
1293           "Count number of bytecodes executed")                             \
1294                                                                             \
1295   develop(bool, PrintBytecodeHistogram, false,                              \
1296           "Print histogram of the executed bytecodes")                      \
1297                                                                             \
1298   develop(bool, PrintBytecodePairHistogram, false,                          \
1299           "Print histogram of the executed bytecode pairs")                 \
1300                                                                             \
1301   diagnostic(bool, PrintSignatureHandlers, false,                           \
1302           "Print code generated for native method signature handlers")      \
1303                                                                             \
1304   develop(bool, VerifyOops, false,                                          \
1305           "Do plausibility checks for oops")                                \
1306                                                                             \
1307   develop(bool, CheckUnhandledOops, false,                                  \
1308           "Check for unhandled oops in VM code")                            \
1309                                                                             \
1310   develop(bool, VerifyJNIFields, trueInDebug,                               \
1311           "Verify jfieldIDs for instance fields")                           \
1312                                                                             \
1313   notproduct(bool, VerifyJNIEnvThread, false,                               \
1314           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
1315           "from JNI")                                                       \
1316                                                                             \
1317   develop(bool, VerifyFPU, false,                                           \
1318           "Verify FPU state (check for NaN's, etc.)")                       \
1319                                                                             \
1320   develop(bool, VerifyThread, false,                                        \
1321           "Watch the thread register for corruption (SPARC only)")          \
1322                                                                             \
1323   develop(bool, VerifyActivationFrameSize, false,                           \
1324           "Verify that activation frame didn't become smaller than its "    \
1325           "minimal size")                                                   \
1326                                                                             \
1327   develop(bool, TraceFrequencyInlining, false,                              \
1328           "Trace frequency based inlining")                                 \
1329                                                                             \
1330   develop_pd(bool, InlineIntrinsics,                                        \
1331           "Inline intrinsics that can be statically resolved")              \
1332                                                                             \
1333   product_pd(bool, ProfileInterpreter,                                      \
1334           "Profile at the bytecode level during interpretation")            \
1335                                                                             \
1336   develop(bool, TraceProfileInterpreter, false,                             \
1337           "Trace profiling at the bytecode level during interpretation. "   \
1338           "This outputs the profiling information collected to improve "    \
1339           "jit compilation.")                                               \
1340                                                                             \
1341   develop_pd(bool, ProfileTraps,                                            \
1342           "Profile deoptimization traps at the bytecode level")             \
1343                                                                             \
1344   product(intx, ProfileMaturityPercentage, 20,                              \
1345           "number of method invocations/branches (expressed as % of "       \
1346           "CompileThreshold) before using the method's profile")            \
1347           range(0, 100)                                                     \
1348                                                                             \
1349   diagnostic(bool, PrintMethodData, false,                                  \
1350           "Print the results of +ProfileInterpreter at end of run")         \
1351                                                                             \
1352   develop(bool, VerifyDataPointer, trueInDebug,                             \
1353           "Verify the method data pointer during interpreter profiling")    \
1354                                                                             \
1355   develop(bool, VerifyCompiledCode, false,                                  \
1356           "Include miscellaneous runtime verifications in nmethod code; "   \
1357           "default off because it disturbs nmethod size heuristics")        \
1358                                                                             \
1359   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
1360           "Manually make GC thread crash then dump java stack trace;  "     \
1361           "Test only")                                                      \
1362                                                                             \
1363   /* compilation */                                                         \
1364   product(bool, UseCompiler, true,                                          \
1365           "Use Just-In-Time compilation")                                   \
1366                                                                             \
1367   product(bool, UseCounterDecay, true,                                      \
1368           "Adjust recompilation counters")                                  \
1369                                                                             \
1370   develop(intx, CounterHalfLifeTime,    30,                                 \
1371           "Half-life time of invocation counters (in seconds)")             \
1372                                                                             \
1373   develop(intx, CounterDecayMinIntervalLength,   500,                       \
1374           "The minimum interval (in milliseconds) between invocation of "   \
1375           "CounterDecay")                                                   \
1376                                                                             \
1377   product(bool, AlwaysCompileLoopMethods, false,                            \
1378           "When using recompilation, never interpret methods "              \
1379           "containing loops")                                               \
1380                                                                             \
1381   product(bool, DontCompileHugeMethods, true,                               \
1382           "Do not compile methods > HugeMethodLimit")                       \
1383                                                                             \
1384   /* Bytecode escape analysis estimation. */                                \
1385   product(bool, EstimateArgEscape, true,                                    \
1386           "Analyze bytecodes to estimate escape state of arguments")        \
1387                                                                             \
1388   product(intx, BCEATraceLevel, 0,                                          \
1389           "How much tracing to do of bytecode escape analysis estimates "   \
1390           "(0-3)")                                                          \
1391           range(0, 3)                                                       \
1392                                                                             \
1393   product(intx, MaxBCEAEstimateLevel, 5,                                    \
1394           "Maximum number of nested calls that are analyzed by BC EA")      \
1395           range(0, max_jint)                                                \
1396                                                                             \
1397   product(intx, MaxBCEAEstimateSize, 150,                                   \
1398           "Maximum bytecode size of a method to be analyzed by BC EA")      \
1399           range(0, max_jint)                                                \
1400                                                                             \
1401   product(intx,  AllocatePrefetchStyle, 1,                                  \
1402           "0 = no prefetch, "                                               \
1403           "1 = generate prefetch instructions for each allocation, "        \
1404           "2 = use TLAB watermark to gate allocation prefetch, "            \
1405           "3 = generate one prefetch instruction per cache line")           \
1406           range(0, 3)                                                       \
1407                                                                             \
1408   product(intx,  AllocatePrefetchDistance, -1,                              \
1409           "Distance to prefetch ahead of allocation pointer. "              \
1410           "-1: use system-specific value (automatically determined")        \
1411           range(-1, 512)                                                    \
1412           constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\
1413                                                                             \
1414   product(intx,  AllocatePrefetchLines, 3,                                  \
1415           "Number of lines to prefetch ahead of array allocation pointer")  \
1416           range(1, 64)                                                      \
1417                                                                             \
1418   product(intx,  AllocateInstancePrefetchLines, 1,                          \
1419           "Number of lines to prefetch ahead of instance allocation "       \
1420           "pointer")                                                        \
1421           range(1, 64)                                                      \
1422                                                                             \
1423   product(intx,  AllocatePrefetchStepSize, 16,                              \
1424           "Step size in bytes of sequential prefetch instructions")         \
1425           range(1, 512)                                                     \
1426           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1427                                                                             \
1428   product(intx,  AllocatePrefetchInstr, 0,                                  \
1429           "Select instruction to prefetch ahead of allocation pointer")     \
1430           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
1431                                                                             \
1432   /* deoptimization */                                                      \
1433   develop(bool, TraceDeoptimization, false,                                 \
1434           "Trace deoptimization")                                           \
1435                                                                             \
1436   develop(bool, PrintDeoptimizationDetails, false,                          \
1437           "Print more information about deoptimization")                    \
1438                                                                             \
1439   develop(bool, DebugDeoptimization, false,                                 \
1440           "Tracing various information while debugging deoptimization")     \
1441                                                                             \
1442   product(intx, SelfDestructTimer, 0,                                       \
1443           "Will cause VM to terminate after a given time (in minutes) "     \
1444           "(0 means off)")                                                  \
1445           range(0, max_intx)                                                \
1446                                                                             \
1447   product(intx, MaxJavaStackTraceDepth, 1024,                               \
1448           "The maximum number of lines in the stack trace for Java "        \
1449           "exceptions (0 means all)")                                       \
1450           range(0, max_jint/2)                                              \
1451                                                                             \
1452   /* notice: the max range value here is max_jint, not max_intx  */         \
1453   /* because of overflow issue                                   */         \
1454   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
1455           "Guarantee a safepoint (at least) every so many milliseconds "    \
1456           "(0 means none)")                                                 \
1457           range(0, max_jint)                                                \
1458                                                                             \
1459   product(intx, SafepointTimeoutDelay, 10000,                               \
1460           "Delay in milliseconds for option SafepointTimeout")              \
1461   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
1462   NOT_LP64(range(0, max_intx))                                              \
1463                                                                             \
1464   product(intx, NmethodSweepActivity, 10,                                   \
1465           "Removes cold nmethods from code cache if > 0. Higher values "    \
1466           "result in more aggressive sweeping")                             \
1467           range(0, 2000)                                                    \
1468                                                                             \
1469   notproduct(bool, LogSweeper, false,                                       \
1470           "Keep a ring buffer of sweeper activity")                         \
1471                                                                             \
1472   notproduct(intx, SweeperLogEntries, 1024,                                 \
1473           "Number of records in the ring buffer of sweeper activity")       \
1474                                                                             \
1475   notproduct(intx, MemProfilingInterval, 500,                               \
1476           "Time between each invocation of the MemProfiler")                \
1477                                                                             \
1478   develop(intx, MallocCatchPtr, -1,                                         \
1479           "Hit breakpoint when mallocing/freeing this pointer")             \
1480                                                                             \
1481   notproduct(ccstrlist, SuppressErrorAt, "",                                \
1482           "List of assertions (file:line) to muzzle")                       \
1483                                                                             \
1484   develop(intx, StackPrintLimit, 100,                                       \
1485           "number of stack frames to print in VM-level stack dump")         \
1486                                                                             \
1487   notproduct(intx, MaxElementPrintSize, 256,                                \
1488           "maximum number of elements to print")                            \
1489                                                                             \
1490   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
1491           "maximum number of subklasses to print when printing klass")      \
1492                                                                             \
1493   product(intx, MaxInlineLevel, 9,                                          \
1494           "maximum number of nested calls that are inlined")                \
1495           range(0, max_jint)                                                \
1496                                                                             \
1497   product(intx, MaxRecursiveInlineLevel, 1,                                 \
1498           "maximum number of nested recursive calls that are inlined")      \
1499           range(0, max_jint)                                                \
1500                                                                             \
1501   develop(intx, MaxForceInlineLevel, 100,                                   \
1502           "maximum number of nested calls that are forced for inlining "    \
1503           "(using CompileCommand or marked w/ @ForceInline)")               \
1504           range(0, max_jint)                                                \
1505                                                                             \
1506   product_pd(intx, InlineSmallCode,                                         \
1507           "Only inline already compiled methods if their code size is "     \
1508           "less than this")                                                 \
1509           range(0, max_jint)                                                \
1510                                                                             \
1511   product(intx, MaxInlineSize, 35,                                          \
1512           "The maximum bytecode size of a method to be inlined")            \
1513           range(0, max_jint)                                                \
1514                                                                             \
1515   product_pd(intx, FreqInlineSize,                                          \
1516           "The maximum bytecode size of a frequent method to be inlined")   \
1517           range(0, max_jint)                                                \
1518                                                                             \
1519   product(intx, MaxTrivialSize, 6,                                          \
1520           "The maximum bytecode size of a trivial method to be inlined")    \
1521           range(0, max_jint)                                                \
1522                                                                             \
1523   product(intx, MinInliningThreshold, 250,                                  \
1524           "The minimum invocation count a method needs to have to be "      \
1525           "inlined")                                                        \
1526           range(0, max_jint)                                                \
1527                                                                             \
1528   develop(intx, MethodHistogramCutoff, 100,                                 \
1529           "The cutoff value for method invocation histogram (+CountCalls)") \
1530                                                                             \
1531   develop(intx, DontYieldALotInterval,    10,                               \
1532           "Interval between which yields will be dropped (milliseconds)")   \
1533                                                                             \
1534   notproduct(intx, DeoptimizeALotInterval,     5,                           \
1535           "Number of exits until DeoptimizeALot kicks in")                  \
1536                                                                             \
1537   notproduct(intx, ZombieALotInterval,     5,                               \
1538           "Number of exits until ZombieALot kicks in")                      \
1539                                                                             \
1540   diagnostic(uintx, MallocMaxTestWords,     0,                              \
1541           "If non-zero, maximum number of words that malloc/realloc can "   \
1542           "allocate (for testing only)")                                    \
1543           range(0, max_uintx)                                               \
1544                                                                             \
1545   product(intx, TypeProfileWidth, 2,                                        \
1546           "Number of receiver types to record in call/cast profile")        \
1547           range(0, 8)                                                       \
1548                                                                             \
1549   develop(intx, BciProfileWidth,      2,                                    \
1550           "Number of return bci's to record in ret profile")                \
1551                                                                             \
1552   product(intx, PerMethodRecompilationCutoff, 400,                          \
1553           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1554           range(-1, max_intx)                                               \
1555                                                                             \
1556   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
1557           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
1558           range(-1, max_intx)                                               \
1559                                                                             \
1560   product(intx, PerMethodTrapLimit,  100,                                   \
1561           "Limit on traps (of one kind) in a method (includes inlines)")    \
1562           range(0, max_jint)                                                \
1563                                                                             \
1564   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
1565           "Limit on speculative traps (of one kind) in a method "           \
1566           "(includes inlines)")                                             \
1567           range(0, max_jint)                                                \
1568                                                                             \
1569   product(intx, PerBytecodeTrapLimit,  4,                                   \
1570           "Limit on traps (of one kind) at a particular BCI")               \
1571           range(0, max_jint)                                                \
1572                                                                             \
1573   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
1574           "Extra method data trap entries for speculation")                 \
1575                                                                             \
1576   develop(intx, InlineFrequencyRatio,    20,                                \
1577           "Ratio of call site execution to caller method invocation")       \
1578           range(0, max_jint)                                                \
1579                                                                             \
1580   diagnostic_pd(intx, InlineFrequencyCount,                                 \
1581           "Count of call site execution necessary to trigger frequent "     \
1582           "inlining")                                                       \
1583           range(0, max_jint)                                                \
1584                                                                             \
1585   develop(intx, InlineThrowCount,    50,                                    \
1586           "Force inlining of interpreted methods that throw this often")    \
1587           range(0, max_jint)                                                \
1588                                                                             \
1589   develop(intx, InlineThrowMaxSize,   200,                                  \
1590           "Force inlining of throwing methods smaller than this")           \
1591           range(0, max_jint)                                                \
1592                                                                             \
1593   develop(intx, ProfilerNodeSize,  1024,                                    \
1594           "Size in K to allocate for the Profile Nodes of each thread")     \
1595           range(0, 1024)                                                    \
1596                                                                             \
1597   product_pd(size_t, MetaspaceSize,                                         \
1598           "Initial threshold (in bytes) at which a garbage collection "     \
1599           "is done to reduce Metaspace usage")                              \
1600           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
1601                                                                             \
1602   product(size_t, MaxMetaspaceSize, max_uintx,                              \
1603           "Maximum size of Metaspaces (in bytes)")                          \
1604           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
1605                                                                             \
1606   product(size_t, CompressedClassSpaceSize, 1*G,                            \
1607           "Maximum size of class area in Metaspace when compressed "        \
1608           "class pointers are used")                                        \
1609           range(1*M, 3*G)                                                   \
1610                                                                             \
1611   manageable(uintx, MinHeapFreeRatio, 40,                                   \
1612           "The minimum percentage of heap free after GC to avoid expansion."\
1613           " For most GCs this applies to the old generation. In G1 and"     \
1614           " ParallelGC it applies to the whole heap.")                      \
1615           range(0, 100)                                                     \
1616           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
1617                                                                             \
1618   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
1619           "The maximum percentage of heap free after GC to avoid shrinking."\
1620           " For most GCs this applies to the old generation. In G1 and"     \
1621           " ParallelGC it applies to the whole heap.")                      \
1622           range(0, 100)                                                     \
1623           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
1624                                                                             \
1625   product(bool, ShrinkHeapInSteps, true,                                    \
1626           "When disabled, informs the GC to shrink the java heap directly"  \
1627           " to the target size at the next full GC rather than requiring"   \
1628           " smaller steps during multiple full GCs.")                       \
1629                                                                             \
1630   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
1631           "Number of milliseconds per MB of free space in the heap")        \
1632           range(0, max_intx)                                                \
1633           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1634                                                                             \
1635   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
1636           "The minimum change in heap space due to GC (in bytes)")          \
1637           range(0, max_uintx)                                               \
1638                                                                             \
1639   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
1640           "The minimum expansion of Metaspace (in bytes)")                  \
1641           range(0, max_uintx)                                               \
1642                                                                             \
1643   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
1644           "The maximum percentage of Metaspace free after GC to avoid "     \
1645           "shrinking")                                                      \
1646           range(0, 100)                                                     \
1647           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1648                                                                             \
1649   product(uintx, MinMetaspaceFreeRatio,    40,                              \
1650           "The minimum percentage of Metaspace free after GC to avoid "     \
1651           "expansion")                                                      \
1652           range(0, 99)                                                      \
1653           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1654                                                                             \
1655   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
1656           "The maximum expansion of Metaspace without full GC (in bytes)")  \
1657           range(0, max_uintx)                                               \
1658                                                                             \
1659   /* stack parameters */                                                    \
1660   product_pd(intx, StackYellowPages,                                        \
1661           "Number of yellow zone (recoverable overflows) pages of size "    \
1662           "4KB. If pages are bigger yellow zone is aligned up.")            \
1663           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
1664                                                                             \
1665   product_pd(intx, StackRedPages,                                           \
1666           "Number of red zone (unrecoverable overflows) pages of size "     \
1667           "4KB. If pages are bigger red zone is aligned up.")               \
1668           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
1669                                                                             \
1670   product_pd(intx, StackReservedPages,                                      \
1671           "Number of reserved zone (reserved to annotated methods) pages"   \
1672           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1673           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1674                                                                             \
1675   product(bool, RestrictReservedStack, true,                                \
1676           "Restrict @ReservedStackAccess to trusted classes")               \
1677                                                                             \
1678   /* greater stack shadow pages can't generate instruction to bang stack */ \
1679   product_pd(intx, StackShadowPages,                                        \
1680           "Number of shadow zone (for overflow checking) pages of size "    \
1681           "4KB. If pages are bigger shadow zone is aligned up. "            \
1682           "This should exceed the depth of the VM and native call stack.")  \
1683           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
1684                                                                             \
1685   product_pd(intx, ThreadStackSize,                                         \
1686           "Thread Stack Size (in Kbytes)")                                  \
1687           range(0, 1 * M)                                                   \
1688                                                                             \
1689   product_pd(intx, VMThreadStackSize,                                       \
1690           "Non-Java Thread Stack Size (in Kbytes)")                         \
1691           range(0, max_intx/(1 * K))                                        \
1692                                                                             \
1693   product_pd(intx, CompilerThreadStackSize,                                 \
1694           "Compiler Thread Stack Size (in Kbytes)")                         \
1695           range(0, max_intx/(1 * K))                                        \
1696                                                                             \
1697   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
1698           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
1699                                                                             \
1700   /* code cache parameters                                    */            \
1701   develop_pd(uintx, CodeCacheSegmentSize,                                   \
1702           "Code cache segment size (in bytes) - smallest unit of "          \
1703           "allocation")                                                     \
1704           range(1, 1024)                                                    \
1705           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
1706                                                                             \
1707   develop_pd(intx, CodeEntryAlignment,                                      \
1708           "Code entry alignment for generated code (in bytes)")             \
1709           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
1710                                                                             \
1711   product_pd(intx, OptoLoopAlignment,                                       \
1712           "Align inner loops to zero relative to this modulus")             \
1713           range(1, 16)                                                      \
1714           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
1715                                                                             \
1716   product_pd(uintx, InitialCodeCacheSize,                                   \
1717           "Initial code cache size (in bytes)")                             \
1718           range(os::vm_page_size(), max_uintx)                              \
1719                                                                             \
1720   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
1721           "Minimum code cache size (in bytes) required to start VM.")       \
1722           range(0, max_uintx)                                               \
1723                                                                             \
1724   product(bool, SegmentedCodeCache, false,                                  \
1725           "Use a segmented code cache")                                     \
1726                                                                             \
1727   product_pd(uintx, ReservedCodeCacheSize,                                  \
1728           "Reserved code cache size (in bytes) - maximum code cache size")  \
1729           range(os::vm_page_size(), max_uintx)                              \
1730                                                                             \
1731   product_pd(uintx, NonProfiledCodeHeapSize,                                \
1732           "Size of code heap with non-profiled methods (in bytes)")         \
1733           range(0, max_uintx)                                               \
1734                                                                             \
1735   product_pd(uintx, ProfiledCodeHeapSize,                                   \
1736           "Size of code heap with profiled methods (in bytes)")             \
1737           range(0, max_uintx)                                               \
1738                                                                             \
1739   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
1740           "Size of code heap with non-nmethods (in bytes)")                 \
1741           range(os::vm_page_size(), max_uintx)                              \
1742                                                                             \
1743   product_pd(uintx, CodeCacheExpansionSize,                                 \
1744           "Code cache expansion size (in bytes)")                           \
1745           range(32*K, max_uintx)                                            \
1746                                                                             \
1747   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
1748           "Minimum number of segments in a code cache block")               \
1749           range(1, 100)                                                     \
1750                                                                             \
1751   notproduct(bool, ExitOnFullCodeCache, false,                              \
1752           "Exit the VM if we fill the code cache")                          \
1753                                                                             \
1754   product(bool, UseCodeCacheFlushing, true,                                 \
1755           "Remove cold/old nmethods from the code cache")                   \
1756                                                                             \
1757   product(uintx, StartAggressiveSweepingAt, 10,                             \
1758           "Start aggressive sweeping if X[%] of the code cache is free."    \
1759           "Segmented code cache: X[%] of the non-profiled heap."            \
1760           "Non-segmented code cache: X[%] of the total code cache")         \
1761           range(0, 100)                                                     \
1762                                                                             \
1763   /* AOT parameters */                                                      \
1764   experimental(bool, UseAOT, false,                                         \
1765           "Use AOT compiled files")                                         \
1766                                                                             \
1767   experimental(ccstrlist, AOTLibrary, NULL,                                 \
1768           "AOT library")                                                    \
1769                                                                             \
1770   experimental(bool, PrintAOT, false,                                       \
1771           "Print used AOT klasses and methods")                             \
1772                                                                             \
1773   notproduct(bool, PrintAOTStatistics, false,                               \
1774           "Print AOT statistics")                                           \
1775                                                                             \
1776   diagnostic(bool, UseAOTStrictLoading, false,                              \
1777           "Exit the VM if any of the AOT libraries has invalid config")     \
1778                                                                             \
1779   product(bool, CalculateClassFingerprint, false,                           \
1780           "Calculate class fingerprint")                                    \
1781                                                                             \
1782   /* interpreter debugging */                                               \
1783   develop(intx, BinarySwitchThreshold, 5,                                   \
1784           "Minimal number of lookupswitch entries for rewriting to binary " \
1785           "switch")                                                         \
1786                                                                             \
1787   develop(intx, StopInterpreterAt, 0,                                       \
1788           "Stop interpreter execution at specified bytecode number")        \
1789                                                                             \
1790   develop(intx, TraceBytecodesAt, 0,                                        \
1791           "Trace bytecodes starting with specified bytecode number")        \
1792                                                                             \
1793   /* compiler interface */                                                  \
1794   develop(intx, CIStart, 0,                                                 \
1795           "The id of the first compilation to permit")                      \
1796                                                                             \
1797   develop(intx, CIStop, max_jint,                                           \
1798           "The id of the last compilation to permit")                       \
1799                                                                             \
1800   develop(intx, CIStartOSR, 0,                                              \
1801           "The id of the first osr compilation to permit "                  \
1802           "(CICountOSR must be on)")                                        \
1803                                                                             \
1804   develop(intx, CIStopOSR, max_jint,                                        \
1805           "The id of the last osr compilation to permit "                   \
1806           "(CICountOSR must be on)")                                        \
1807                                                                             \
1808   develop(intx, CIBreakAtOSR, -1,                                           \
1809           "The id of osr compilation to break at")                          \
1810                                                                             \
1811   develop(intx, CIBreakAt, -1,                                              \
1812           "The id of compilation to break at")                              \
1813                                                                             \
1814   product(ccstrlist, CompileOnly, "",                                       \
1815           "List of methods (pkg/class.name) to restrict compilation to")    \
1816                                                                             \
1817   product(ccstr, CompileCommandFile, NULL,                                  \
1818           "Read compiler commands from this file [.hotspot_compiler]")      \
1819                                                                             \
1820   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
1821           "Read compiler directives from this file")                        \
1822                                                                             \
1823   product(ccstrlist, CompileCommand, "",                                    \
1824           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
1825                                                                             \
1826   develop(bool, ReplayCompiles, false,                                      \
1827           "Enable replay of compilations from ReplayDataFile")              \
1828                                                                             \
1829   product(ccstr, ReplayDataFile, NULL,                                      \
1830           "File containing compilation replay information"                  \
1831           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
1832                                                                             \
1833    product(ccstr, InlineDataFile, NULL,                                     \
1834           "File containing inlining replay information"                     \
1835           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
1836                                                                             \
1837   develop(intx, ReplaySuppressInitializers, 2,                              \
1838           "Control handling of class initialization during replay: "        \
1839           "0 - don't do anything special; "                                 \
1840           "1 - treat all class initializers as empty; "                     \
1841           "2 - treat class initializers for application classes as empty; " \
1842           "3 - allow all class initializers to run during bootstrap but "   \
1843           "    pretend they are empty after starting replay")               \
1844           range(0, 3)                                                       \
1845                                                                             \
1846   develop(bool, ReplayIgnoreInitErrors, false,                              \
1847           "Ignore exceptions thrown during initialization for replay")      \
1848                                                                             \
1849   product(bool, DumpReplayDataOnError, true,                                \
1850           "Record replay data for crashing compiler threads")               \
1851                                                                             \
1852   product(bool, CICompilerCountPerCPU, false,                               \
1853           "1 compiler thread for log(N CPUs)")                              \
1854                                                                             \
1855   notproduct(intx, CICrashAt, -1,                                           \
1856           "id of compilation to trigger assert in compiler thread for "     \
1857           "the purpose of testing, e.g. generation of replay data")         \
1858   notproduct(bool, CIObjectFactoryVerify, false,                            \
1859           "enable potentially expensive verification in ciObjectFactory")   \
1860                                                                             \
1861   diagnostic(bool, AbortVMOnCompilationFailure, false,                      \
1862           "Abort VM when method had failed to compile.")                    \
1863                                                                             \
1864   /* Priorities */                                                          \
1865   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
1866                                                                             \
1867   product(intx, ThreadPriorityPolicy, 0,                                    \
1868           "0 : Normal.                                                     "\
1869           "    VM chooses priorities that are appropriate for normal       "\
1870           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
1871           "    to normal native priority. Java priorities below "           \
1872           "    NORM_PRIORITY map to lower native priority values. On       "\
1873           "    Windows applications are allowed to use higher native       "\
1874           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
1875           "    not use the highest possible native priority,               "\
1876           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
1877           "    system threads. On Linux thread priorities are ignored      "\
1878           "    because the OS does not support static priority in          "\
1879           "    SCHED_OTHER scheduling class which is the only choice for   "\
1880           "    non-root, non-realtime applications.                        "\
1881           "1 : Aggressive.                                                 "\
1882           "    Java thread priorities map over to the entire range of      "\
1883           "    native thread priorities. Higher Java thread priorities map "\
1884           "    to higher native thread priorities. This policy should be   "\
1885           "    used with care, as sometimes it can cause performance       "\
1886           "    degradation in the application and/or the entire system. On "\
1887           "    Linux/BSD/macOS this policy requires root privilege or an   "\
1888           "    extended capability.")                                       \
1889           range(0, 1)                                                       \
1890                                                                             \
1891   product(bool, ThreadPriorityVerbose, false,                               \
1892           "Print priority changes")                                         \
1893                                                                             \
1894   product(intx, CompilerThreadPriority, -1,                                 \
1895           "The native priority at which compiler threads should run "       \
1896           "(-1 means no change)")                                           \
1897           range(min_jint, max_jint)                                         \
1898           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
1899                                                                             \
1900   product(intx, VMThreadPriority, -1,                                       \
1901           "The native priority at which the VM thread should run "          \
1902           "(-1 means no change)")                                           \
1903           range(-1, 127)                                                    \
1904                                                                             \
1905   product(intx, JavaPriority1_To_OSPriority, -1,                            \
1906           "Map Java priorities to OS priorities")                           \
1907           range(-1, 127)                                                    \
1908                                                                             \
1909   product(intx, JavaPriority2_To_OSPriority, -1,                            \
1910           "Map Java priorities to OS priorities")                           \
1911           range(-1, 127)                                                    \
1912                                                                             \
1913   product(intx, JavaPriority3_To_OSPriority, -1,                            \
1914           "Map Java priorities to OS priorities")                           \
1915           range(-1, 127)                                                    \
1916                                                                             \
1917   product(intx, JavaPriority4_To_OSPriority, -1,                            \
1918           "Map Java priorities to OS priorities")                           \
1919           range(-1, 127)                                                    \
1920                                                                             \
1921   product(intx, JavaPriority5_To_OSPriority, -1,                            \
1922           "Map Java priorities to OS priorities")                           \
1923           range(-1, 127)                                                    \
1924                                                                             \
1925   product(intx, JavaPriority6_To_OSPriority, -1,                            \
1926           "Map Java priorities to OS priorities")                           \
1927           range(-1, 127)                                                    \
1928                                                                             \
1929   product(intx, JavaPriority7_To_OSPriority, -1,                            \
1930           "Map Java priorities to OS priorities")                           \
1931           range(-1, 127)                                                    \
1932                                                                             \
1933   product(intx, JavaPriority8_To_OSPriority, -1,                            \
1934           "Map Java priorities to OS priorities")                           \
1935           range(-1, 127)                                                    \
1936                                                                             \
1937   product(intx, JavaPriority9_To_OSPriority, -1,                            \
1938           "Map Java priorities to OS priorities")                           \
1939           range(-1, 127)                                                    \
1940                                                                             \
1941   product(intx, JavaPriority10_To_OSPriority,-1,                            \
1942           "Map Java priorities to OS priorities")                           \
1943           range(-1, 127)                                                    \
1944                                                                             \
1945   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
1946           "Java thread priority 10 maps to critical scheduling priority")   \
1947                                                                             \
1948   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
1949           "Compiler thread(s) run at critical scheduling priority")         \
1950                                                                             \
1951   develop(intx, NewCodeParameter,      0,                                   \
1952           "Testing Only: Create a dedicated integer parameter before "      \
1953           "putback")                                                        \
1954                                                                             \
1955   /* new oopmap storage allocation */                                       \
1956   develop(intx, MinOopMapAllocation,     8,                                 \
1957           "Minimum number of OopMap entries in an OopMapSet")               \
1958                                                                             \
1959   /* Background Compilation */                                              \
1960   develop(intx, LongCompileThreshold,     50,                               \
1961           "Used with +TraceLongCompiles")                                   \
1962                                                                             \
1963   /* recompilation */                                                       \
1964   product_pd(intx, CompileThreshold,                                        \
1965           "number of interpreted method invocations before (re-)compiling") \
1966           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
1967                                                                             \
1968   product(double, CompileThresholdScaling, 1.0,                             \
1969           "Factor to control when first compilation happens "               \
1970           "(both with and without tiered compilation): "                    \
1971           "values greater than 1.0 delay counter overflow, "                \
1972           "values between 0 and 1.0 rush counter overflow, "                \
1973           "value of 1.0 leaves compilation thresholds unchanged "           \
1974           "value of 0.0 is equivalent to -Xint. "                           \
1975           ""                                                                \
1976           "Flag can be set as per-method option. "                          \
1977           "If a value is specified for a method, compilation thresholds "   \
1978           "for that method are scaled by both the value of the global flag "\
1979           "and the value of the per-method flag.")                          \
1980           range(0.0, DBL_MAX)                                               \
1981                                                                             \
1982   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
1983           "Interpreter (tier 0) invocation notification frequency")         \
1984           range(0, 30)                                                      \
1985                                                                             \
1986   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
1987           "C1 without MDO (tier 2) invocation notification frequency")      \
1988           range(0, 30)                                                      \
1989                                                                             \
1990   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
1991           "C1 with MDO profiling (tier 3) invocation notification "         \
1992           "frequency")                                                      \
1993           range(0, 30)                                                      \
1994                                                                             \
1995   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
1996           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
1997           range(0, 30)                                                      \
1998                                                                             \
1999   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
2000           "Interpreter (tier 0) invocation notification frequency")         \
2001           range(0, 30)                                                      \
2002                                                                             \
2003   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
2004           "C1 without MDO (tier 2) invocation notification frequency")      \
2005           range(0, 30)                                                      \
2006                                                                             \
2007   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
2008           "C1 with MDO profiling (tier 3) invocation notification "         \
2009           "frequency")                                                      \
2010           range(0, 30)                                                      \
2011                                                                             \
2012   product(intx, Tier2CompileThreshold, 0,                                   \
2013           "threshold at which tier 2 compilation is invoked")               \
2014           range(0, max_jint)                                                \
2015                                                                             \
2016   product(intx, Tier2BackEdgeThreshold, 0,                                  \
2017           "Back edge threshold at which tier 2 compilation is invoked")     \
2018           range(0, max_jint)                                                \
2019                                                                             \
2020   product(intx, Tier3InvocationThreshold, 200,                              \
2021           "Compile if number of method invocations crosses this "           \
2022           "threshold")                                                      \
2023           range(0, max_jint)                                                \
2024                                                                             \
2025   product(intx, Tier3MinInvocationThreshold, 100,                           \
2026           "Minimum invocation to compile at tier 3")                        \
2027           range(0, max_jint)                                                \
2028                                                                             \
2029   product(intx, Tier3CompileThreshold, 2000,                                \
2030           "Threshold at which tier 3 compilation is invoked (invocation "   \
2031           "minimum must be satisfied)")                                     \
2032           range(0, max_jint)                                                \
2033                                                                             \
2034   product(intx, Tier3BackEdgeThreshold,  60000,                             \
2035           "Back edge threshold at which tier 3 OSR compilation is invoked") \
2036           range(0, max_jint)                                                \
2037                                                                             \
2038   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
2039           "Compile if number of method invocations crosses this "           \
2040           "threshold if coming from AOT")                                   \
2041           range(0, max_jint)                                                \
2042                                                                             \
2043   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
2044           "Minimum invocation to compile at tier 3 if coming from AOT")     \
2045           range(0, max_jint)                                                \
2046                                                                             \
2047   product(intx, Tier3AOTCompileThreshold, 15000,                            \
2048           "Threshold at which tier 3 compilation is invoked (invocation "   \
2049           "minimum must be satisfied) if coming from AOT")                  \
2050           range(0, max_jint)                                                \
2051                                                                             \
2052   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
2053           "Back edge threshold at which tier 3 OSR compilation is invoked " \
2054           "if coming from AOT")                                             \
2055           range(0, max_jint)                                                \
2056                                                                             \
2057   diagnostic(intx, Tier0AOTInvocationThreshold, 200,                        \
2058           "Switch to interpreter to profile if the number of method "       \
2059           "invocations crosses this threshold if coming from AOT "          \
2060           "(applicable only with "                                          \
2061           "CompilationMode=high-only|high-only-quick-internal)")            \
2062           range(0, max_jint)                                                \
2063                                                                             \
2064   diagnostic(intx, Tier0AOTMinInvocationThreshold, 100,                     \
2065           "Minimum number of invocations to switch to interpreter "         \
2066           "to profile if coming from AOT "                                  \
2067           "(applicable only with "                                          \
2068           "CompilationMode=high-only|high-only-quick-internal)")            \
2069           range(0, max_jint)                                                \
2070                                                                             \
2071   diagnostic(intx, Tier0AOTCompileThreshold, 2000,                          \
2072           "Threshold at which to switch to interpreter to profile "         \
2073           "if coming from AOT "                                             \
2074           "(invocation minimum must be satisfied, "                         \
2075           "applicable only with "                                           \
2076           "CompilationMode=high-only|high-only-quick-internal)")            \
2077           range(0, max_jint)                                                \
2078                                                                             \
2079   diagnostic(intx, Tier0AOTBackEdgeThreshold,  60000,                       \
2080           "Back edge threshold at which to switch to interpreter "          \
2081           "to profile if coming from AOT "                                  \
2082           "(applicable only with "                                          \
2083           "CompilationMode=high-only|high-only-quick-internal)")            \
2084           range(0, max_jint)                                                \
2085                                                                             \
2086   product(intx, Tier4InvocationThreshold, 5000,                             \
2087           "Compile if number of method invocations crosses this "           \
2088           "threshold")                                                      \
2089           range(0, max_jint)                                                \
2090                                                                             \
2091   product(intx, Tier4MinInvocationThreshold, 600,                           \
2092           "Minimum invocation to compile at tier 4")                        \
2093           range(0, max_jint)                                                \
2094                                                                             \
2095   product(intx, Tier4CompileThreshold, 15000,                               \
2096           "Threshold at which tier 4 compilation is invoked (invocation "   \
2097           "minimum must be satisfied)")                                     \
2098           range(0, max_jint)                                                \
2099                                                                             \
2100   product(intx, Tier4BackEdgeThreshold, 40000,                              \
2101           "Back edge threshold at which tier 4 OSR compilation is invoked") \
2102           range(0, max_jint)                                                \
2103                                                                             \
2104   diagnostic(intx, Tier40InvocationThreshold, 5000,                         \
2105           "Compile if number of method invocations crosses this "           \
2106           "threshold (applicable only with "                                \
2107           "CompilationMode=high-only|high-only-quick-internal)")            \
2108           range(0, max_jint)                                                \
2109                                                                             \
2110   diagnostic(intx, Tier40MinInvocationThreshold, 600,                       \
2111           "Minimum number of invocations to compile at tier 4 "             \
2112           "(applicable only with "                                          \
2113           "CompilationMode=high-only|high-only-quick-internal)")            \
2114           range(0, max_jint)                                                \
2115                                                                             \
2116   diagnostic(intx, Tier40CompileThreshold, 10000,                           \
2117           "Threshold at which tier 4 compilation is invoked (invocation "   \
2118           "minimum must be satisfied, applicable only with "                \
2119           "CompilationMode=high-only|high-only-quick-internal)")            \
2120           range(0, max_jint)                                                \
2121                                                                             \
2122   diagnostic(intx, Tier40BackEdgeThreshold, 15000,                          \
2123           "Back edge threshold at which tier 4 OSR compilation is invoked " \
2124           "(applicable only with "                                          \
2125           "CompilationMode=high-only|high-only-quick-internal)")            \
2126           range(0, max_jint)                                                \
2127                                                                             \
2128   diagnostic(intx, Tier0Delay, 5,                                           \
2129           "If C2 queue size grows over this amount per compiler thread "    \
2130           "do not start profiling in the interpreter "                      \
2131           "(applicable only with "                                          \
2132           "CompilationMode=high-only|high-only-quick-internal)")            \
2133           range(0, max_jint)                                                \
2134                                                                             \
2135   product(intx, Tier3DelayOn, 5,                                            \
2136           "If C2 queue size grows over this amount per compiler thread "    \
2137           "stop compiling at tier 3 and start compiling at tier 2")         \
2138           range(0, max_jint)                                                \
2139                                                                             \
2140   product(intx, Tier3DelayOff, 2,                                           \
2141           "If C2 queue size is less than this amount per compiler thread "  \
2142           "allow methods compiled at tier 2 transition to tier 3")          \
2143           range(0, max_jint)                                                \
2144                                                                             \
2145   product(intx, Tier3LoadFeedback, 5,                                       \
2146           "Tier 3 thresholds will increase twofold when C1 queue size "     \
2147           "reaches this amount per compiler thread")                        \
2148           range(0, max_jint)                                                \
2149                                                                             \
2150   product(intx, Tier4LoadFeedback, 3,                                       \
2151           "Tier 4 thresholds will increase twofold when C2 queue size "     \
2152           "reaches this amount per compiler thread")                        \
2153           range(0, max_jint)                                                \
2154                                                                             \
2155   product(intx, TieredCompileTaskTimeout, 50,                               \
2156           "Kill compile task if method was not used within "                \
2157           "given timeout in milliseconds")                                  \
2158           range(0, max_intx)                                                \
2159                                                                             \
2160   product(intx, TieredStopAtLevel, 4,                                       \
2161           "Stop at given compilation level")                                \
2162           range(0, 4)                                                       \
2163                                                                             \
2164   product(intx, Tier0ProfilingStartPercentage, 200,                         \
2165           "Start profiling in interpreter if the counters exceed tier 3 "   \
2166           "thresholds (tier 4 thresholds with "                             \
2167           "CompilationMode=high-only|high-only-quick-internal)"             \
2168           "by the specified percentage")                                    \
2169           range(0, max_jint)                                                \
2170                                                                             \
2171   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
2172           "Increase the compile threshold for C1 compilation if the code "  \
2173           "cache is filled by the specified percentage")                    \
2174           range(0, 99)                                                      \
2175                                                                             \
2176   product(intx, TieredRateUpdateMinTime, 1,                                 \
2177           "Minimum rate sampling interval (in milliseconds)")               \
2178           range(0, max_intx)                                                \
2179                                                                             \
2180   product(intx, TieredRateUpdateMaxTime, 25,                                \
2181           "Maximum rate sampling interval (in milliseconds)")               \
2182           range(0, max_intx)                                                \
2183                                                                             \
2184   product(ccstr, CompilationMode, "default",                                \
2185           "Compilation modes: "                                             \
2186           "default: normal tiered compilation; "                            \
2187           "quick-only: C1-only mode; "                                      \
2188           "high-only: C2/JVMCI-only mode; "                                 \
2189           "high-only-quick-internal: C2/JVMCI-only mode, "                  \
2190           "with JVMCI compiler compiled with C1.")                          \
2191                                                                             \
2192   product_pd(bool, TieredCompilation,                                       \
2193           "Enable tiered compilation")                                      \
2194                                                                             \
2195   product(bool, PrintTieredEvents, false,                                   \
2196           "Print tiered events notifications")                              \
2197                                                                             \
2198   product_pd(intx, OnStackReplacePercentage,                                \
2199           "NON_TIERED number of method invocations/branches (expressed as " \
2200           "% of CompileThreshold) before (re-)compiling OSR code")          \
2201           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
2202                                                                             \
2203   product(intx, InterpreterProfilePercentage, 33,                           \
2204           "NON_TIERED number of method invocations/branches (expressed as " \
2205           "% of CompileThreshold) before profiling in the interpreter")     \
2206           range(0, 100)                                                     \
2207                                                                             \
2208   develop(intx, DesiredMethodLimit,  8000,                                  \
2209           "The desired maximum method size (in bytecodes) after inlining")  \
2210                                                                             \
2211   develop(intx, HugeMethodLimit,  8000,                                     \
2212           "Don't compile methods larger than this if "                      \
2213           "+DontCompileHugeMethods")                                        \
2214                                                                             \
2215   /* Properties for Java libraries  */                                      \
2216                                                                             \
2217   product(uint64_t, MaxDirectMemorySize, 0,                                 \
2218           "Maximum total size of NIO direct-buffer allocations")            \
2219           range(0, max_jlong)                                               \
2220                                                                             \
2221   /* Flags used for temporary code during development  */                   \
2222                                                                             \
2223   diagnostic(bool, UseNewCode, false,                                       \
2224           "Testing Only: Use the new version while testing")                \
2225                                                                             \
2226   diagnostic(bool, UseNewCode2, false,                                      \
2227           "Testing Only: Use the new version while testing")                \
2228                                                                             \
2229   diagnostic(bool, UseNewCode3, false,                                      \
2230           "Testing Only: Use the new version while testing")                \
2231                                                                             \
2232   /* flags for performance data collection */                               \
2233                                                                             \
2234   product(bool, UsePerfData, true,                                          \
2235           "Flag to disable jvmstat instrumentation for performance testing "\
2236           "and problem isolation purposes")                                 \
2237                                                                             \
2238   product(bool, PerfDataSaveToFile, false,                                  \
2239           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
2240                                                                             \
2241   product(ccstr, PerfDataSaveFile, NULL,                                    \
2242           "Save PerfData memory to the specified absolute pathname. "       \
2243           "The string %p in the file name (if present) "                    \
2244           "will be replaced by pid")                                        \
2245                                                                             \
2246   product(intx, PerfDataSamplingInterval, 50,                               \
2247           "Data sampling interval (in milliseconds)")                       \
2248           range(PeriodicTask::min_interval, max_jint)                       \
2249           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
2250                                                                             \
2251   product(bool, PerfDisableSharedMem, false,                                \
2252           "Store performance data in standard memory")                      \
2253                                                                             \
2254   product(intx, PerfDataMemorySize, 32*K,                                   \
2255           "Size of performance data memory region. Will be rounded "        \
2256           "up to a multiple of the native os page size.")                   \
2257           range(128, 32*64*K)                                               \
2258                                                                             \
2259   product(intx, PerfMaxStringConstLength, 1024,                             \
2260           "Maximum PerfStringConstant string length before truncation")     \
2261           range(32, 32*K)                                                   \
2262                                                                             \
2263   product(bool, PerfAllowAtExitRegistration, false,                         \
2264           "Allow registration of atexit() methods")                         \
2265                                                                             \
2266   product(bool, PerfBypassFileSystemCheck, false,                           \
2267           "Bypass Win32 file system criteria checks (Windows Only)")        \
2268                                                                             \
2269   product(intx, UnguardOnExecutionViolation, 0,                             \
2270           "Unguard page and retry on no-execute fault (Win32 only) "        \
2271           "0=off, 1=conservative, 2=aggressive")                            \
2272           range(0, 2)                                                       \
2273                                                                             \
2274   /* Serviceability Support */                                              \
2275                                                                             \
2276   product(bool, ManagementServer, false,                                    \
2277           "Create JMX Management Server")                                   \
2278                                                                             \
2279   product(bool, DisableAttachMechanism, false,                              \
2280           "Disable mechanism that allows tools to attach to this VM")       \
2281                                                                             \
2282   product(bool, StartAttachListener, false,                                 \
2283           "Always start Attach Listener at VM startup")                     \
2284                                                                             \
2285   product(bool, EnableDynamicAgentLoading, true,                            \
2286           "Allow tools to load agents with the attach mechanism")           \
2287                                                                             \
2288   manageable(bool, PrintConcurrentLocks, false,                             \
2289           "Print java.util.concurrent locks in thread dump")                \
2290                                                                             \
2291   /* Shared spaces */                                                       \
2292                                                                             \
2293   product(bool, UseSharedSpaces, true,                                      \
2294           "Use shared spaces for metadata")                                 \
2295                                                                             \
2296   product(bool, VerifySharedSpaces, false,                                  \
2297           "Verify integrity of shared spaces")                              \
2298                                                                             \
2299   product(bool, RequireSharedSpaces, false,                                 \
2300           "Require shared spaces for metadata")                             \
2301                                                                             \
2302   product(bool, DumpSharedSpaces, false,                                    \
2303           "Special mode: JVM reads a class list, loads classes, builds "    \
2304           "shared spaces, and dumps the shared spaces to a file to be "     \
2305           "used in future JVM runs")                                        \
2306                                                                             \
2307   product(bool, DynamicDumpSharedSpaces, false,                             \
2308           "Dynamic archive")                                                \
2309                                                                             \
2310   product(bool, PrintSharedArchiveAndExit, false,                           \
2311           "Print shared archive file contents")                             \
2312                                                                             \
2313   product(bool, PrintSharedDictionary, false,                               \
2314           "If PrintSharedArchiveAndExit is true, also print the shared "    \
2315           "dictionary")                                                     \
2316                                                                             \
2317   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
2318           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
2319           "Address to allocate shared memory region for class data")        \
2320           range(0, SIZE_MAX)                                                \
2321                                                                             \
2322   product(ccstr, SharedArchiveConfigFile, NULL,                             \
2323           "Data to add to the CDS archive file")                            \
2324                                                                             \
2325   product(uintx, SharedSymbolTableBucketSize, 4,                            \
2326           "Average number of symbols per bucket in shared table")           \
2327           range(2, 246)                                                     \
2328                                                                             \
2329   diagnostic(bool, AllowArchivingWithJavaAgent, false,                      \
2330           "Allow Java agent to be run with CDS dumping")                    \
2331                                                                             \
2332   diagnostic(bool, PrintMethodHandleStubs, false,                           \
2333           "Print generated stub code for method handles")                   \
2334                                                                             \
2335   develop(bool, TraceMethodHandles, false,                                  \
2336           "trace internal method handle operations")                        \
2337                                                                             \
2338   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
2339           "perform extra checks when constructing method handles")          \
2340                                                                             \
2341   diagnostic(bool, ShowHiddenFrames, false,                                 \
2342           "show method handle implementation frames (usually hidden)")      \
2343                                                                             \
2344   experimental(bool, TrustFinalNonStaticFields, false,                      \
2345           "trust final non-static declarations for constant folding")       \
2346                                                                             \
2347   diagnostic(bool, FoldStableValues, true,                                  \
2348           "Optimize loads from stable fields (marked w/ @Stable)")          \
2349                                                                             \
2350   develop(bool, TraceInvokeDynamic, false,                                  \
2351           "trace internal invoke dynamic operations")                       \
2352                                                                             \
2353   diagnostic(int, UseBootstrapCallInfo, 1,                                  \
2354           "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2355           "resolved before the bootstrap method is called; 1: when a BSM "  \
2356           "that may accept a BootstrapCallInfo is detected, use that API "  \
2357           "to pass BSM arguments, which allows the BSM to delay their "     \
2358           "resolution; 2+: stress test the BCI API by calling more BSMs "   \
2359           "via that API, instead of with the eagerly-resolved array.")      \
2360                                                                             \
2361   diagnostic(bool, PauseAtStartup,      false,                              \
2362           "Causes the VM to pause at startup time and wait for the pause "  \
2363           "file to be removed (default: ./vm.paused.<pid>)")                \
2364                                                                             \
2365   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
2366           "The file to create and for whose removal to await when pausing " \
2367           "at startup. (default: ./vm.paused.<pid>)")                       \
2368                                                                             \
2369   diagnostic(bool, PauseAtExit, false,                                      \
2370           "Pause and wait for keypress on exit if a debugger is attached")  \
2371                                                                             \
2372   product(bool, ExtendedDTraceProbes,    false,                             \
2373           "Enable performance-impacting dtrace probes")                     \
2374                                                                             \
2375   product(bool, DTraceMethodProbes, false,                                  \
2376           "Enable dtrace probes for method-entry and method-exit")          \
2377                                                                             \
2378   product(bool, DTraceAllocProbes, false,                                   \
2379           "Enable dtrace probes for object allocation")                     \
2380                                                                             \
2381   product(bool, DTraceMonitorProbes, false,                                 \
2382           "Enable dtrace probes for monitor events")                        \
2383                                                                             \
2384   product(bool, RelaxAccessControlCheck, false,                             \
2385           "Relax the access control checks in the verifier")                \
2386                                                                             \
2387   product(uintx, StringTableSize, defaultStringTableSize,                   \
2388           "Number of buckets in the interned String table "                 \
2389           "(will be rounded to nearest higher power of 2)")                 \
2390           range(minimumStringTableSize, 16777216ul /* 2^24 */)              \
2391                                                                             \
2392   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
2393           "Number of buckets in the JVM internal Symbol table")             \
2394           range(minimumSymbolTableSize, 16777216ul /* 2^24 */)              \
2395                                                                             \
2396   product(bool, UseStringDeduplication, false,                              \
2397           "Use string deduplication")                                       \
2398                                                                             \
2399   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
2400           "A string must reach this age (or be promoted to an old region) " \
2401           "to be considered for deduplication")                             \
2402           range(1, markWord::max_age)                                       \
2403                                                                             \
2404   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
2405           "Force table resize every time the table is scanned")             \
2406                                                                             \
2407   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
2408           "Force table rehash every time the table is scanned")             \
2409                                                                             \
2410   diagnostic(bool, WhiteBoxAPI, false,                                      \
2411           "Enable internal testing APIs")                                   \
2412                                                                             \
2413   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
2414            "Default survivor space alignment in bytes")                     \
2415            range(8, 256)                                                    \
2416            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
2417                                                                             \
2418   product(ccstr, DumpLoadedClassList, NULL,                                 \
2419           "Dump the names all loaded classes, that could be stored into "   \
2420           "the CDS archive, in the specified file")                         \
2421                                                                             \
2422   product(ccstr, SharedClassListFile, NULL,                                 \
2423           "Override the default CDS class list")                            \
2424                                                                             \
2425   product(ccstr, SharedArchiveFile, NULL,                                   \
2426           "Override the default location of the CDS archive file")          \
2427                                                                             \
2428   product(ccstr, ArchiveClassesAtExit, NULL,                                \
2429           "The path and name of the dynamic archive file")                  \
2430                                                                             \
2431   product(ccstr, ExtraSharedClassListFile, NULL,                            \
2432           "Extra classlist for building the CDS archive file")              \
2433                                                                             \
2434   diagnostic(intx, ArchiveRelocationMode, 0,                                \
2435            "(0) first map at preferred address, and if "                    \
2436            "unsuccessful, map at alternative address (default); "           \
2437            "(1) always map at alternative address; "                        \
2438            "(2) always map at preferred address, and if unsuccessful, "     \
2439            "do not map the archive")                                        \
2440            range(0, 2)                                                      \
2441                                                                             \
2442   experimental(size_t, ArrayAllocatorMallocLimit,                           \
2443           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
2444           "Allocation less than this value will be allocated "              \
2445           "using malloc. Larger allocations will use mmap.")                \
2446                                                                             \
2447   experimental(bool, AlwaysAtomicAccesses, false,                           \
2448           "Accesses to all variables should always be atomic")              \
2449                                                                             \
2450   diagnostic(bool, UseUnalignedAccesses, false,                             \
2451           "Use unaligned memory accesses in Unsafe")                        \
2452                                                                             \
2453   product_pd(bool, PreserveFramePointer,                                    \
2454              "Use the FP register for holding the frame pointer "           \
2455              "and not as a general purpose register.")                      \
2456                                                                             \
2457   diagnostic(bool, CheckIntrinsics, true,                                   \
2458              "When a class C is loaded, check that "                        \
2459              "(1) all intrinsics defined by the VM for class C are present "\
2460              "in the loaded class file and are marked with the "            \
2461              "@HotSpotIntrinsicCandidate annotation, that "                 \
2462              "(2) there is an intrinsic registered for all loaded methods " \
2463              "that are annotated with the @HotSpotIntrinsicCandidate "      \
2464              "annotation, and that "                                        \
2465              "(3) no orphan methods exist for class C (i.e., methods for "  \
2466              "which the VM declares an intrinsic but that are not declared "\
2467              "in the loaded class C. "                                      \
2468              "Check (3) is available only in debug builds.")                \
2469                                                                             \
2470   diagnostic_pd(intx, InitArrayShortSize,                                   \
2471           "Threshold small size (in bytes) for clearing arrays. "           \
2472           "Anything this size or smaller may get converted to discrete "    \
2473           "scalar stores.")                                                 \
2474           range(0, max_intx)                                                \
2475           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
2476                                                                             \
2477   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
2478              "Disable backwards compatibility for compile commands.")       \
2479                                                                             \
2480   diagnostic(bool, CompilerDirectivesPrint, false,                          \
2481              "Print compiler directives on installation.")                  \
2482   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
2483              "Limit on number of compiler directives.")                     \
2484                                                                             \
2485   product(ccstr, AllocateHeapAt, NULL,                                      \
2486           "Path to the directoy where a temporary file will be created "    \
2487           "to use as the backing store for Java Heap.")                     \
2488                                                                             \
2489   experimental(ccstr, AllocateOldGenAt, NULL,                               \
2490           "Path to the directoy where a temporary file will be "            \
2491           "created to use as the backing store for old generation."         \
2492           "File of size Xmx is pre-allocated for performance reason, so"    \
2493           "we need that much space available")                              \
2494                                                                             \
2495   develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0),       \
2496                "Run periodic metaspace verifications (0 - none, "           \
2497                "1 - always, >1 every nth interval)")                        \
2498                                                                             \
2499   diagnostic(bool, ShowRegistersOnAssert, true,                             \
2500           "On internal errors, include registers in error report.")         \
2501                                                                             \
2502   diagnostic(bool, UseSwitchProfiling, true,                                \
2503           "leverage profiling for table/lookup switch")                     \
2504                                                                             \
2505   develop(bool, TraceMemoryWriteback, false,                                \
2506           "Trace memory writeback operations")                              \
2507                                                                             \
2508   JFR_ONLY(product(bool, FlightRecorder, false,                             \
2509           "(Deprecated) Enable Flight Recorder"))                           \
2510                                                                             \
2511   JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL,                      \
2512           "Flight Recorder options"))                                       \
2513                                                                             \
2514   JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
2515           "Start flight recording with options"))                           \
2516                                                                             \
2517   experimental(bool, UseFastUnorderedTimeStamps, false,                     \
2518           "Use platform unstable time where supported for timestamps only")
2519 
2520 // Interface macros
2521 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
2522 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
2523 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
2524 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
2525 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
2526 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
2527 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
2528 #ifdef PRODUCT
2529 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
2530 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
2531 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
2532 #else
2533 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
2534 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
2535 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
2536 #endif // PRODUCT
2537 // Special LP64 flags, product only needed for now.
2538 #ifdef _LP64
2539 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2540 #else
2541 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
2542 #endif // _LP64
2543 
2544 ALL_FLAGS(DECLARE_DEVELOPER_FLAG,     \
2545           DECLARE_PD_DEVELOPER_FLAG,  \
2546           DECLARE_PRODUCT_FLAG,       \
2547           DECLARE_PD_PRODUCT_FLAG,    \
2548           DECLARE_DIAGNOSTIC_FLAG,    \
2549           DECLARE_PD_DIAGNOSTIC_FLAG, \
2550           DECLARE_EXPERIMENTAL_FLAG,  \
2551           DECLARE_NOTPRODUCT_FLAG,    \
2552           DECLARE_MANAGEABLE_FLAG,    \
2553           DECLARE_PRODUCT_RW_FLAG,    \
2554           DECLARE_LP64_PRODUCT_FLAG,  \
2555           IGNORE_RANGE,               \
2556           IGNORE_CONSTRAINT,          \
2557           IGNORE_WRITEABLE)
2558 
2559 #endif // SHARE_RUNTIME_GLOBALS_HPP