1 /*
   2  * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_RUNTIME_GLOBALS_HPP
  26 #define SHARE_RUNTIME_GLOBALS_HPP
  27 
  28 #include "gc/shared/gc_globals.hpp"
  29 #include "utilities/align.hpp"
  30 #include "utilities/globalDefinitions.hpp"
  31 #include "utilities/macros.hpp"
  32 
  33 #include <float.h> // for DBL_MAX
  34 
  35 // The larger HeapWordSize for 64bit requires larger heaps
  36 // for the same application running in 64bit.  See bug 4967770.
  37 // The minimum alignment to a heap word size is done.  Other
  38 // parts of the memory system may require additional alignment
  39 // and are responsible for those alignments.
  40 #ifdef _LP64
  41 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize)
  42 #else
  43 #define ScaleForWordSize(x) (x)
  44 #endif
  45 
  46 // use this for flags that are true per default in the tiered build
  47 // but false in non-tiered builds, and vice versa
  48 #ifdef TIERED
  49 #define  trueInTiered true
  50 #define falseInTiered false
  51 #else
  52 #define  trueInTiered false
  53 #define falseInTiered true
  54 #endif
  55 
  56 // Default and minimum StringTable and SymbolTable size values
  57 // Must be powers of 2
  58 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536);
  59 const size_t minimumStringTableSize = 128;
  60 const size_t defaultSymbolTableSize = 32768; // 2^15
  61 const size_t minimumSymbolTableSize = 1024;
  62 
  63 #include CPU_HEADER(globals)
  64 #include OS_HEADER(globals)
  65 #include OS_CPU_HEADER(globals)
  66 #ifdef COMPILER1
  67 #include CPU_HEADER(c1_globals)
  68 #include OS_HEADER(c1_globals)
  69 #endif
  70 #ifdef COMPILER2
  71 #include CPU_HEADER(c2_globals)
  72 #include OS_HEADER(c2_globals)
  73 #endif
  74 
  75 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI
  76 define_pd_global(bool, BackgroundCompilation,        false);
  77 define_pd_global(bool, UseTLAB,                      false);
  78 define_pd_global(bool, CICompileOSR,                 false);
  79 define_pd_global(bool, UseTypeProfile,               false);
  80 define_pd_global(bool, UseOnStackReplacement,        false);
  81 define_pd_global(bool, InlineIntrinsics,             false);
  82 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  83 define_pd_global(bool, ProfileInterpreter,           false);
  84 define_pd_global(bool, ProfileTraps,                 false);
  85 define_pd_global(bool, TieredCompilation,            false);
  86 
  87 define_pd_global(intx, CompileThreshold,             0);
  88 
  89 define_pd_global(intx,   OnStackReplacePercentage,   0);
  90 define_pd_global(bool,   ResizeTLAB,                 false);
  91 define_pd_global(intx,   FreqInlineSize,             0);
  92 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
  93 define_pd_global(bool,   InlineClassNatives,         true);
  94 define_pd_global(bool,   InlineUnsafeOps,            true);
  95 define_pd_global(uintx,  InitialCodeCacheSize,       160*K);
  96 define_pd_global(uintx,  ReservedCodeCacheSize,      32*M);
  97 define_pd_global(uintx,  NonProfiledCodeHeapSize,    0);
  98 define_pd_global(uintx,  ProfiledCodeHeapSize,       0);
  99 define_pd_global(uintx,  NonNMethodCodeHeapSize,     32*M);
 100 
 101 define_pd_global(uintx,  CodeCacheExpansionSize,     32*K);
 102 define_pd_global(uintx,  CodeCacheMinBlockLength,    1);
 103 define_pd_global(uintx,  CodeCacheMinimumUseSpace,   200*K);
 104 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
 105 define_pd_global(bool, NeverActAsServerClassMachine, true);
 106 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 107 #define CI_COMPILER_COUNT 0
 108 #else
 109 
 110 #if COMPILER2_OR_JVMCI
 111 #define CI_COMPILER_COUNT 2
 112 #else
 113 #define CI_COMPILER_COUNT 1
 114 #endif // COMPILER2_OR_JVMCI
 115 
 116 #endif // no compilers
 117 
 118 // use this for flags that are true by default in the debug version but
 119 // false in the optimized version, and vice versa
 120 #ifdef ASSERT
 121 #define trueInDebug  true
 122 #define falseInDebug false
 123 #else
 124 #define trueInDebug  false
 125 #define falseInDebug true
 126 #endif
 127 
 128 // use this for flags that are true per default in the product build
 129 // but false in development builds, and vice versa
 130 #ifdef PRODUCT
 131 #define trueInProduct  true
 132 #define falseInProduct false
 133 #else
 134 #define trueInProduct  false
 135 #define falseInProduct true
 136 #endif
 137 
 138 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 139 // product flags are always settable / visible
 140 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 141 
 142 // A flag must be declared with one of the following types:
 143 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t.
 144 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used
 145 // only in this file, because the macrology requires single-token type names.
 146 
 147 // Note: Diagnostic options not meant for VM tuning or for product modes.
 148 // They are to be used for VM quality assurance or field diagnosis
 149 // of VM bugs.  They are hidden so that users will not be encouraged to
 150 // try them as if they were VM ordinary execution options.  However, they
 151 // are available in the product version of the VM.  Under instruction
 152 // from support engineers, VM customers can turn them on to collect
 153 // diagnostic information about VM problems.  To use a VM diagnostic
 154 // option, you must first specify +UnlockDiagnosticVMOptions.
 155 // (This master switch also affects the behavior of -Xprintflags.)
 156 //
 157 // experimental flags are in support of features that are not
 158 //    part of the officially supported product, but are available
 159 //    for experimenting with. They could, for example, be performance
 160 //    features that may not have undergone full or rigorous QA, but which may
 161 //    help performance in some cases and released for experimentation
 162 //    by the community of users and developers. This flag also allows one to
 163 //    be able to build a fully supported product that nonetheless also
 164 //    ships with some unsupported, lightly tested, experimental features.
 165 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 166 //    UnlockExperimentalVMOptions flag, which allows the control and
 167 //    modification of the experimental flags.
 168 //
 169 // Nota bene: neither diagnostic nor experimental options should be used casually,
 170 //    and they are not supported on production loads, except under explicit
 171 //    direction from support engineers.
 172 //
 173 // manageable flags are writeable external product flags.
 174 //    They are dynamically writeable through the JDK management interface
 175 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 176 //    These flags are external exported interface (see CCC).  The list of
 177 //    manageable flags can be queried programmatically through the management
 178 //    interface.
 179 //
 180 //    A flag can be made as "manageable" only if
 181 //    - the flag is defined in a CCC as an external exported interface.
 182 //    - the VM implementation supports dynamic setting of the flag.
 183 //      This implies that the VM must *always* query the flag variable
 184 //      and not reuse state related to the flag state at any given time.
 185 //    - you want the flag to be queried programmatically by the customers.
 186 //
 187 // product_rw flags are writeable internal product flags.
 188 //    They are like "manageable" flags but for internal/private use.
 189 //    The list of product_rw flags are internal/private flags which
 190 //    may be changed/removed in a future release.  It can be set
 191 //    through the management interface to get/set value
 192 //    when the name of flag is supplied.
 193 //
 194 //    A flag can be made as "product_rw" only if
 195 //    - the VM implementation supports dynamic setting of the flag.
 196 //      This implies that the VM must *always* query the flag variable
 197 //      and not reuse state related to the flag state at any given time.
 198 //
 199 // Note that when there is a need to support develop flags to be writeable,
 200 // it can be done in the same way as product_rw.
 201 //
 202 // range is a macro that will expand to min and max arguments for range
 203 //    checking code if provided - see jvmFlagRangeList.hpp
 204 //
 205 // constraint is a macro that will expand to custom function call
 206 //    for constraint checking if provided - see jvmFlagConstraintList.hpp
 207 //
 208 // writeable is a macro that controls if and how the value can change during the runtime
 209 //
 210 // writeable(Always) is optional and allows the flag to have its value changed
 211 //    without any limitations at any time
 212 //
 213 // writeable(Once) flag value's can be only set once during the lifetime of VM
 214 //
 215 // writeable(CommandLineOnly) flag value's can be only set from command line
 216 //    (multiple times allowed)
 217 //
 218 
 219 
 220 #define RUNTIME_FLAGS(develop, \
 221                       develop_pd, \
 222                       product, \
 223                       product_pd, \
 224                       diagnostic, \
 225                       diagnostic_pd, \
 226                       experimental, \
 227                       notproduct, \
 228                       manageable, \
 229                       product_rw, \
 230                       lp64_product, \
 231                       range, \
 232                       constraint, \
 233                       writeable) \
 234                                                                             \
 235   lp64_product(bool, UseCompressedOops, false,                              \
 236           "Use 32-bit object references in 64-bit VM. "                     \
 237           "lp64_product means flag is always constant in 32 bit VM")        \
 238                                                                             \
 239   lp64_product(bool, UseCompressedClassPointers, false,                     \
 240           "Use 32-bit class pointers in 64-bit VM. "                        \
 241           "lp64_product means flag is always constant in 32 bit VM")        \
 242                                                                             \
 243   notproduct(bool, CheckCompressedOops, true,                               \
 244           "Generate checks in encoding/decoding code in debug VM")          \
 245                                                                             \
 246   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 247           "Heap allocation steps through preferred address regions to find" \
 248           " where it can allocate the heap. Number of steps to take per "   \
 249           "region.")                                                        \
 250           range(1, max_uintx)                                               \
 251                                                                             \
 252   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 253           "Default object alignment in bytes, 8 is minimum")                \
 254           range(8, 256)                                                     \
 255           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 256                                                                             \
 257   develop(bool, CleanChunkPoolAsync, true,                                  \
 258           "Clean the chunk pool asynchronously")                            \
 259                                                                             \
 260   product_pd(bool, ThreadLocalHandshakes,                                   \
 261           "Use thread-local polls instead of global poll for safepoints.")  \
 262           constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo)         \
 263                                                                             \
 264   diagnostic(uint, HandshakeTimeout, 0,                                     \
 265           "If nonzero set a timeout in milliseconds for handshakes")        \
 266                                                                             \
 267   experimental(bool, AlwaysSafeConstructors, false,                         \
 268           "Force safe construction, as if all fields are final.")           \
 269                                                                             \
 270   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 271           "Enable normal processing of flags relating to field diagnostics")\
 272                                                                             \
 273   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 274           "Enable normal processing of flags relating to experimental "     \
 275           "features")                                                       \
 276                                                                             \
 277   product(bool, JavaMonitorsInStackTrace, true,                             \
 278           "Print information about Java monitor locks when the stacks are"  \
 279           "dumped")                                                         \
 280                                                                             \
 281   product_pd(bool, UseLargePages,                                           \
 282           "Use large page memory")                                          \
 283                                                                             \
 284   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 285           "Allocate large pages individually for better affinity")          \
 286                                                                             \
 287   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 288           "Fail large pages individual allocation")                         \
 289                                                                             \
 290   product(bool, UseLargePagesInMetaspace, false,                            \
 291           "Use large page memory in metaspace. "                            \
 292           "Only used if UseLargePages is enabled.")                         \
 293                                                                             \
 294   product(bool, UseNUMA, false,                                             \
 295           "Use NUMA if available")                                          \
 296                                                                             \
 297   product(bool, UseNUMAInterleaving, false,                                 \
 298           "Interleave memory across NUMA nodes if available")               \
 299                                                                             \
 300   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 301           "Granularity to use for NUMA interleaving on Windows OS")         \
 302           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 303                                                                             \
 304   product(bool, ForceNUMA, false,                                           \
 305           "Force NUMA optimizations on single-node/UMA systems")            \
 306                                                                             \
 307   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 308           "Percentage (0-100) used to weight the current sample when "      \
 309           "computing exponentially decaying average for "                   \
 310           "AdaptiveNUMAChunkSizing")                                        \
 311           range(0, 100)                                                     \
 312                                                                             \
 313   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 314           "Do not reallocate more than this amount per collection")         \
 315           range(0, max_uintx)                                               \
 316                                                                             \
 317   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 318           "Enable adaptive chunk sizing for NUMA")                          \
 319                                                                             \
 320   product(bool, NUMAStats, false,                                           \
 321           "Print NUMA stats in detailed heap information")                  \
 322                                                                             \
 323   product(uintx, NUMAPageScanRate, 256,                                     \
 324           "Maximum number of pages to include in the page scan procedure")  \
 325           range(0, max_uintx)                                               \
 326                                                                             \
 327   product_pd(bool, NeedsDeoptSuspend,                                       \
 328           "True for register window machines (sparc/ia64)")                 \
 329                                                                             \
 330   product(intx, UseSSE, 99,                                                 \
 331           "Highest supported SSE instructions set on x86/x64")              \
 332           range(0, 99)                                                      \
 333                                                                             \
 334   product(bool, UseAES, false,                                              \
 335           "Control whether AES instructions are used when available")       \
 336                                                                             \
 337   product(bool, UseFMA, false,                                              \
 338           "Control whether FMA instructions are used when available")       \
 339                                                                             \
 340   product(bool, UseSHA, false,                                              \
 341           "Control whether SHA instructions are used when available")       \
 342                                                                             \
 343   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 344           "Use intrinsics for GHASH versions of crypto")                    \
 345                                                                             \
 346   product(bool, UseBASE64Intrinsics, false,                                 \
 347           "Use intrinsics for java.util.Base64")                            \
 348                                                                             \
 349   product(size_t, LargePageSizeInBytes, 0,                                  \
 350           "Large page size (0 to let VM choose the page size)")             \
 351           range(0, max_uintx)                                               \
 352                                                                             \
 353   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 354           "Use large pages if maximum heap is at least this big")           \
 355           range(0, max_uintx)                                               \
 356                                                                             \
 357   product(bool, ForceTimeHighResolution, false,                             \
 358           "Using high time resolution (for Win32 only)")                    \
 359                                                                             \
 360   develop(bool, TracePcPatching, false,                                     \
 361           "Trace usage of frame::patch_pc")                                 \
 362                                                                             \
 363   develop(bool, TraceRelocator, false,                                      \
 364           "Trace the bytecode relocator")                                   \
 365                                                                             \
 366   develop(bool, TraceLongCompiles, false,                                   \
 367           "Print out every time compilation is longer than "                \
 368           "a given threshold")                                              \
 369                                                                             \
 370   develop(bool, SafepointALot, false,                                       \
 371           "Generate a lot of safepoints. This works with "                  \
 372           "GuaranteedSafepointInterval")                                    \
 373                                                                             \
 374   product_pd(bool, BackgroundCompilation,                                   \
 375           "A thread requesting compilation is not blocked during "          \
 376           "compilation")                                                    \
 377                                                                             \
 378   product(bool, PrintVMQWaitTime, false,                                    \
 379           "Print out the waiting time in VM operation queue")               \
 380                                                                             \
 381   product(bool, MethodFlushing, true,                                       \
 382           "Reclamation of zombie and not-entrant methods")                  \
 383                                                                             \
 384   develop(bool, VerifyStack, false,                                         \
 385           "Verify stack of each thread when it is entering a runtime call") \
 386                                                                             \
 387   diagnostic(bool, ForceUnreachable, false,                                 \
 388           "Make all non code cache addresses to be unreachable by "         \
 389           "forcing use of 64bit literal fixups")                            \
 390                                                                             \
 391   notproduct(bool, StressDerivedPointers, false,                            \
 392           "Force scavenge when a derived pointer is detected on stack "     \
 393           "after rtm call")                                                 \
 394                                                                             \
 395   develop(bool, TraceDerivedPointers, false,                                \
 396           "Trace traversal of derived pointers on stack")                   \
 397                                                                             \
 398   notproduct(bool, TraceCodeBlobStacks, false,                              \
 399           "Trace stack-walk of codeblobs")                                  \
 400                                                                             \
 401   product(bool, PrintJNIResolving, false,                                   \
 402           "Used to implement -v:jni")                                       \
 403                                                                             \
 404   notproduct(bool, PrintRewrites, false,                                    \
 405           "Print methods that are being rewritten")                         \
 406                                                                             \
 407   product(bool, UseInlineCaches, true,                                      \
 408           "Use Inline Caches for virtual calls ")                           \
 409                                                                             \
 410   diagnostic(bool, InlineArrayCopy, true,                                   \
 411           "Inline arraycopy native that is known to be part of "            \
 412           "base library DLL")                                               \
 413                                                                             \
 414   diagnostic(bool, InlineObjectHash, true,                                  \
 415           "Inline Object::hashCode() native that is known to be part "      \
 416           "of base library DLL")                                            \
 417                                                                             \
 418   diagnostic(bool, InlineNatives, true,                                     \
 419           "Inline natives that are known to be part of base library DLL")   \
 420                                                                             \
 421   diagnostic(bool, InlineMathNatives, true,                                 \
 422           "Inline SinD, CosD, etc.")                                        \
 423                                                                             \
 424   diagnostic(bool, InlineClassNatives, true,                                \
 425           "Inline Class.isInstance, etc")                                   \
 426                                                                             \
 427   diagnostic(bool, InlineThreadNatives, true,                               \
 428           "Inline Thread.currentThread, etc")                               \
 429                                                                             \
 430   diagnostic(bool, InlineUnsafeOps, true,                                   \
 431           "Inline memory ops (native methods) from Unsafe")                 \
 432                                                                             \
 433   product(bool, CriticalJNINatives, true,                                   \
 434           "Check for critical JNI entry points")                            \
 435                                                                             \
 436   notproduct(bool, StressCriticalJNINatives, false,                         \
 437           "Exercise register saving code in critical natives")              \
 438                                                                             \
 439   diagnostic(bool, UseAESIntrinsics, false,                                 \
 440           "Use intrinsics for AES versions of crypto")                      \
 441                                                                             \
 442   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 443           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 444                                                                             \
 445   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 446           "Use intrinsics for SHA-1 crypto hash function. "                 \
 447           "Requires that UseSHA is enabled.")                               \
 448                                                                             \
 449   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 450           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 451           "Requires that UseSHA is enabled.")                               \
 452                                                                             \
 453   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 454           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 455           "Requires that UseSHA is enabled.")                               \
 456                                                                             \
 457   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 458           "use intrinsics for java.util.zip.CRC32")                         \
 459                                                                             \
 460   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 461           "use intrinsics for java.util.zip.CRC32C")                        \
 462                                                                             \
 463   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 464           "use intrinsics for java.util.zip.Adler32")                       \
 465                                                                             \
 466   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 467           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 468                                                                             \
 469   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 470          "do not expand intrinsics whose (internal) names appear here")     \
 471                                                                             \
 472   develop(bool, TraceCallFixup, false,                                      \
 473           "Trace all call fixups")                                          \
 474                                                                             \
 475   develop(bool, DeoptimizeALot, false,                                      \
 476           "Deoptimize at every exit from the runtime system")               \
 477                                                                             \
 478   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 479           "A comma separated list of bcis to deoptimize at")                \
 480                                                                             \
 481   product(bool, DeoptimizeRandom, false,                                    \
 482           "Deoptimize random frames on random exit from the runtime system")\
 483                                                                             \
 484   notproduct(bool, ZombieALot, false,                                       \
 485           "Create zombies (non-entrant) at exit from the runtime system")   \
 486                                                                             \
 487   notproduct(bool, WalkStackALot, false,                                    \
 488           "Trace stack (no print) at every exit from the runtime system")   \
 489                                                                             \
 490   product(bool, Debugging, false,                                           \
 491           "Set when executing debug methods in debug.cpp "                  \
 492           "(to prevent triggering assertions)")                             \
 493                                                                             \
 494   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 495           "Enable strict checks that safepoints cannot happen for threads " \
 496           "that use NoSafepointVerifier")                                   \
 497                                                                             \
 498   notproduct(bool, VerifyLastFrame, false,                                  \
 499           "Verify oops on last frame on entry to VM")                       \
 500                                                                             \
 501   product(bool, FailOverToOldVerifier, true,                                \
 502           "Fail over to old verifier when split verifier fails")            \
 503                                                                             \
 504   product(bool, SafepointTimeout, false,                                    \
 505           "Time out and warn or fail after SafepointTimeoutDelay "          \
 506           "milliseconds if failed to reach safepoint")                      \
 507                                                                             \
 508   diagnostic(bool, AbortVMOnSafepointTimeout, false,                        \
 509           "Abort upon failure to reach safepoint (see SafepointTimeout)")   \
 510                                                                             \
 511   diagnostic(bool, AbortVMOnVMOperationTimeout, false,                      \
 512           "Abort upon failure to complete VM operation promptly")           \
 513                                                                             \
 514   diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000,                  \
 515           "Delay in milliseconds for option AbortVMOnVMOperationTimeout")   \
 516           range(0, max_intx)                                                \
 517                                                                             \
 518   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 519   /* typically, at most a few retries are needed                    */      \
 520   product(intx, SuspendRetryCount, 50,                                      \
 521           "Maximum retry count for an external suspend request")            \
 522           range(0, max_intx)                                                \
 523                                                                             \
 524   product(intx, SuspendRetryDelay, 5,                                       \
 525           "Milliseconds to delay per retry (* current_retry_count)")        \
 526           range(0, max_intx)                                                \
 527                                                                             \
 528   product(bool, AssertOnSuspendWaitFailure, false,                          \
 529           "Assert/Guarantee on external suspend wait failure")              \
 530                                                                             \
 531   product(bool, TraceSuspendWaitFailures, false,                            \
 532           "Trace external suspend wait failures")                           \
 533                                                                             \
 534   product(bool, MaxFDLimit, true,                                           \
 535           "Bump the number of file descriptors to maximum in Solaris")      \
 536                                                                             \
 537   diagnostic(bool, LogEvents, true,                                         \
 538           "Enable the various ring buffer event logs")                      \
 539                                                                             \
 540   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 541           "Number of ring buffer event logs")                               \
 542           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 543                                                                             \
 544   product(bool, BytecodeVerificationRemote, true,                           \
 545           "Enable the Java bytecode verifier for remote classes")           \
 546                                                                             \
 547   product(bool, BytecodeVerificationLocal, false,                           \
 548           "Enable the Java bytecode verifier for local classes")            \
 549                                                                             \
 550   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 551           "Force exceptions on FP stack under/overflow")                    \
 552                                                                             \
 553   develop(bool, VerifyStackAtCalls, false,                                  \
 554           "Verify that the stack pointer is unchanged after calls")         \
 555                                                                             \
 556   develop(bool, TraceJavaAssertions, false,                                 \
 557           "Trace java language assertions")                                 \
 558                                                                             \
 559   notproduct(bool, VerifyCodeCache, false,                                  \
 560           "Verify code cache on memory allocation/deallocation")            \
 561                                                                             \
 562   develop(bool, UseMallocOnly, false,                                       \
 563           "Use only malloc/free for allocation (no resource area/arena)")   \
 564                                                                             \
 565   develop(bool, PrintMallocStatistics, false,                               \
 566           "Print malloc/free statistics")                                   \
 567                                                                             \
 568   develop(bool, ZapResourceArea, trueInDebug,                               \
 569           "Zap freed resource/arena space with 0xABABABAB")                 \
 570                                                                             \
 571   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 572           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 573                                                                             \
 574   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 575           "Zap allocated/freed stack segments with 0xFADFADED")             \
 576                                                                             \
 577   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 578           "Zap unused heap space with 0xBAADBABE")                          \
 579                                                                             \
 580   develop(bool, CheckZapUnusedHeapArea, false,                              \
 581           "Check zapping of unused heap space")                             \
 582                                                                             \
 583   develop(bool, ZapFillerObjects, trueInDebug,                              \
 584           "Zap filler objects with 0xDEAFBABE")                             \
 585                                                                             \
 586   develop(bool, PrintVMMessages, true,                                      \
 587           "Print VM messages on console")                                   \
 588                                                                             \
 589   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 590           "If > 0, provokes an error after VM initialization; the value "   \
 591           "determines which error to provoke. See test_error_handler() "    \
 592           "in vmError.cpp.")                                                \
 593                                                                             \
 594   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 595           "If > 0, provokes an error inside VM error handler (a secondary " \
 596           "crash). see test_error_handler() in vmError.cpp")                \
 597                                                                             \
 598   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 599           "If true, tests SafeFetch inside error handler.")                 \
 600                                                                             \
 601   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 602           "If true, simulates an unresponsive error handler.")              \
 603                                                                             \
 604   develop(bool, Verbose, false,                                             \
 605           "Print additional debugging information from other modes")        \
 606                                                                             \
 607   develop(bool, PrintMiscellaneous, false,                                  \
 608           "Print uncategorized debugging information (requires +Verbose)")  \
 609                                                                             \
 610   develop(bool, WizardMode, false,                                          \
 611           "Print much more debugging information")                          \
 612                                                                             \
 613   product(bool, ShowMessageBoxOnError, false,                               \
 614           "Keep process alive on VM fatal error")                           \
 615                                                                             \
 616   product(bool, CreateCoredumpOnCrash, true,                                \
 617           "Create core/mini dump on VM fatal error")                        \
 618                                                                             \
 619   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 620           "Timeout, in seconds, to limit the time spent on writing an "     \
 621           "error log in case of a crash.")                                  \
 622           range(0, (uint64_t)max_jlong/1000)                                \
 623                                                                             \
 624   product_pd(bool, UseOSErrorReporting,                                     \
 625           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 626                                                                             \
 627   product(bool, SuppressFatalErrorMessage, false,                           \
 628           "Report NO fatal error message (avoid deadlock)")                 \
 629                                                                             \
 630   product(ccstrlist, OnError, "",                                           \
 631           "Run user-defined commands on fatal error; see VMError.cpp "      \
 632           "for examples")                                                   \
 633                                                                             \
 634   product(ccstrlist, OnOutOfMemoryError, "",                                \
 635           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 636                                                                             \
 637   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 638           "Dump heap to file before any major stop-the-world GC")           \
 639                                                                             \
 640   manageable(bool, HeapDumpAfterFullGC, false,                              \
 641           "Dump heap to file after any major stop-the-world GC")            \
 642                                                                             \
 643   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 644           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 645                                                                             \
 646   manageable(ccstr, HeapDumpPath, NULL,                                     \
 647           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 648           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 649           "in the working directory)")                                      \
 650                                                                             \
 651   develop(bool, BreakAtWarning, false,                                      \
 652           "Execute breakpoint upon encountering VM warning")                \
 653                                                                             \
 654   product(ccstr, NativeMemoryTracking, "off",                               \
 655           "Native memory tracking options")                                 \
 656                                                                             \
 657   diagnostic(bool, PrintNMTStatistics, false,                               \
 658           "Print native memory tracking summary data if it is on")          \
 659                                                                             \
 660   diagnostic(bool, LogCompilation, false,                                   \
 661           "Log compilation activity in detail to LogFile")                  \
 662                                                                             \
 663   product(bool, PrintCompilation, false,                                    \
 664           "Print compilations")                                             \
 665                                                                             \
 666   product(bool, PrintExtendedThreadInfo, false,                             \
 667           "Print more information in thread dump")                          \
 668                                                                             \
 669   diagnostic(bool, TraceNMethodInstalls, false,                             \
 670           "Trace nmethod installation")                                     \
 671                                                                             \
 672   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 673           "0: do not allow scavengable oops in the code cache; "            \
 674           "1: allow scavenging from the code cache; "                       \
 675           "2: emit as many constants as the compiler can see")              \
 676           range(0, 2)                                                       \
 677                                                                             \
 678   product(bool, AlwaysRestoreFPU, false,                                    \
 679           "Restore the FPU control word after every JNI call (expensive)")  \
 680                                                                             \
 681   diagnostic(bool, PrintCompilation2, false,                                \
 682           "Print additional statistics per compilation")                    \
 683                                                                             \
 684   diagnostic(bool, PrintAdapterHandlers, false,                             \
 685           "Print code generated for i2c/c2i adapters")                      \
 686                                                                             \
 687   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 688           "Verify that i2c/c2i adapters are called properly")               \
 689                                                                             \
 690   develop(bool, VerifyAdapterSharing, false,                                \
 691           "Verify that the code for shared adapters is the equivalent")     \
 692                                                                             \
 693   diagnostic(bool, PrintAssembly, false,                                    \
 694           "Print assembly code (using external disassembler.so)")           \
 695                                                                             \
 696   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 697           "Print options string passed to disassembler.so")                 \
 698                                                                             \
 699   notproduct(bool, PrintNMethodStatistics, false,                           \
 700           "Print a summary statistic for the generated nmethods")           \
 701                                                                             \
 702   diagnostic(bool, PrintNMethods, false,                                    \
 703           "Print assembly code for nmethods when generated")                \
 704                                                                             \
 705   diagnostic(bool, PrintNativeNMethods, false,                              \
 706           "Print assembly code for native nmethods when generated")         \
 707                                                                             \
 708   develop(bool, PrintDebugInfo, false,                                      \
 709           "Print debug information for all nmethods when generated")        \
 710                                                                             \
 711   develop(bool, PrintRelocations, false,                                    \
 712           "Print relocation information for all nmethods when generated")   \
 713                                                                             \
 714   develop(bool, PrintDependencies, false,                                   \
 715           "Print dependency information for all nmethods when generated")   \
 716                                                                             \
 717   develop(bool, PrintExceptionHandlers, false,                              \
 718           "Print exception handler tables for all nmethods when generated") \
 719                                                                             \
 720   develop(bool, StressCompiledExceptionHandlers, false,                     \
 721           "Exercise compiled exception handlers")                           \
 722                                                                             \
 723   develop(bool, InterceptOSException, false,                                \
 724           "Start debugger when an implicit OS (e.g. NULL) "                 \
 725           "exception happens")                                              \
 726                                                                             \
 727   product(bool, PrintCodeCache, false,                                      \
 728           "Print the code cache memory usage when exiting")                 \
 729                                                                             \
 730   develop(bool, PrintCodeCache2, false,                                     \
 731           "Print detailed usage information on the code cache when exiting")\
 732                                                                             \
 733   product(bool, PrintCodeCacheOnCompilation, false,                         \
 734           "Print the code cache memory usage each time a method is "        \
 735           "compiled")                                                       \
 736                                                                             \
 737   diagnostic(bool, PrintCodeHeapAnalytics, false,                           \
 738           "Print code heap usage statistics on exit and on full condition") \
 739                                                                             \
 740   diagnostic(bool, PrintStubCode, false,                                    \
 741           "Print generated stub code")                                      \
 742                                                                             \
 743   product(bool, StackTraceInThrowable, true,                                \
 744           "Collect backtrace in throwable when exception happens")          \
 745                                                                             \
 746   product(bool, OmitStackTraceInFastThrow, true,                            \
 747           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 748                                                                             \
 749   product(bool, PrintWarnings, true,                                        \
 750           "Print JVM warnings to output stream")                            \
 751                                                                             \
 752   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 753           "Print warnings for stalled SpinLocks")                           \
 754                                                                             \
 755   product(bool, RegisterFinalizersAtInit, true,                             \
 756           "Register finalizable objects at end of Object.<init> or "        \
 757           "after allocation")                                               \
 758                                                                             \
 759   develop(bool, RegisterReferences, true,                                   \
 760           "Tell whether the VM should register soft/weak/final/phantom "    \
 761           "references")                                                     \
 762                                                                             \
 763   develop(bool, IgnoreRewrites, false,                                      \
 764           "Suppress rewrites of bytecodes in the oopmap generator. "        \
 765           "This is unsafe!")                                                \
 766                                                                             \
 767   develop(bool, PrintCodeCacheExtension, false,                             \
 768           "Print extension of code cache")                                  \
 769                                                                             \
 770   develop(bool, UsePrivilegedStack, true,                                   \
 771           "Enable the security JVM functions")                              \
 772                                                                             \
 773   develop(bool, ProtectionDomainVerification, true,                         \
 774           "Verify protection domain before resolution in system dictionary")\
 775                                                                             \
 776   product(bool, ClassUnloading, true,                                       \
 777           "Do unloading of classes")                                        \
 778                                                                             \
 779   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
 780           "Do unloading of classes with a concurrent marking cycle")        \
 781                                                                             \
 782   develop(bool, DisableStartThread, false,                                  \
 783           "Disable starting of additional Java threads "                    \
 784           "(for debugging only)")                                           \
 785                                                                             \
 786   develop(bool, MemProfiling, false,                                        \
 787           "Write memory usage profiling to log file")                       \
 788                                                                             \
 789   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 790           "Print the system dictionary at exit")                            \
 791                                                                             \
 792   diagnostic(bool, DynamicallyResizeSystemDictionaries, true,               \
 793           "Dynamically resize system dictionaries as needed")               \
 794                                                                             \
 795   product(bool, AlwaysLockClassLoader, false,                               \
 796           "Require the VM to acquire the class loader lock before calling " \
 797           "loadClass() even for class loaders registering "                 \
 798           "as parallel capable")                                            \
 799                                                                             \
 800   product(bool, AllowParallelDefineClass, false,                            \
 801           "Allow parallel defineClass requests for class loaders "          \
 802           "registering as parallel capable")                                \
 803                                                                             \
 804   product_pd(bool, DontYieldALot,                                           \
 805           "Throw away obvious excess yield calls")                          \
 806                                                                             \
 807   develop(bool, UseDetachedThreads, true,                                   \
 808           "Use detached threads that are recycled upon termination "        \
 809           "(for Solaris only)")                                             \
 810                                                                             \
 811   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
 812                "Disable the use of stack guard pages if the JVM is loaded " \
 813                "on the primordial process thread")                          \
 814                                                                             \
 815   product(bool, UseLWPSynchronization, true,                                \
 816           "Use LWP-based instead of libthread-based synchronization "       \
 817           "(SPARC only)")                                                   \
 818                                                                             \
 819   product(intx, MonitorBound, 0, "Bound Monitor population")                \
 820           range(0, max_jint)                                                \
 821                                                                             \
 822   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
 823                 "Percentage of used monitors before triggering cleanup "    \
 824                 "safepoint which deflates monitors (0 is off). "            \
 825                 "The check is performed on GuaranteedSafepointInterval.")   \
 826                 range(0, 100)                                               \
 827                                                                             \
 828   experimental(intx, hashCode, 5,                                           \
 829                "(Unstable) select hashCode generation algorithm")           \
 830                                                                             \
 831   product(bool, FilterSpuriousWakeups, true,                                \
 832           "When true prevents OS-level spurious, or premature, wakeups "    \
 833           "from Object.wait (Ignored for Windows)")                         \
 834                                                                             \
 835   develop(bool, UsePthreads, false,                                         \
 836           "Use pthread-based instead of libthread-based synchronization "   \
 837           "(SPARC only)")                                                   \
 838                                                                             \
 839   product(bool, ReduceSignalUsage, false,                                   \
 840           "Reduce the use of OS signals in Java and/or the VM")             \
 841                                                                             \
 842   develop_pd(bool, ShareVtableStubs,                                        \
 843           "Share vtable stubs (smaller code but worse branch prediction")   \
 844                                                                             \
 845   develop(bool, LoadLineNumberTables, true,                                 \
 846           "Tell whether the class file parser loads line number tables")    \
 847                                                                             \
 848   develop(bool, LoadLocalVariableTables, true,                              \
 849           "Tell whether the class file parser loads local variable tables") \
 850                                                                             \
 851   develop(bool, LoadLocalVariableTypeTables, true,                          \
 852           "Tell whether the class file parser loads local variable type"    \
 853           "tables")                                                         \
 854                                                                             \
 855   product(bool, AllowUserSignalHandlers, false,                             \
 856           "Do not complain if the application installs signal handlers "    \
 857           "(Solaris & Linux only)")                                         \
 858                                                                             \
 859   product(bool, UseSignalChaining, true,                                    \
 860           "Use signal-chaining to invoke signal handlers installed "        \
 861           "by the application (Solaris & Linux only)")                      \
 862                                                                             \
 863   product(bool, AllowJNIEnvProxy, false,                                    \
 864           "Allow JNIEnv proxies for jdbx")                                  \
 865                                                                             \
 866   product(bool, RestoreMXCSROnJNICalls, false,                              \
 867           "Restore MXCSR when returning from JNI calls")                    \
 868                                                                             \
 869   product(bool, CheckJNICalls, false,                                       \
 870           "Verify all arguments to JNI calls")                              \
 871                                                                             \
 872   product(bool, UseFastJNIAccessors, true,                                  \
 873           "Use optimized versions of Get<Primitive>Field")                  \
 874                                                                             \
 875   product(intx, MaxJNILocalCapacity, 65536,                                 \
 876           "Maximum allowable local JNI handle capacity to "                 \
 877           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
 878           "where <= 0 is unlimited, default: 65536")                        \
 879           range(min_intx, max_intx)                                         \
 880                                                                             \
 881   product(bool, EagerXrunInit, false,                                       \
 882           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 883           "but not all -Xrun libraries may support the state of the VM "    \
 884           "at this time")                                                   \
 885                                                                             \
 886   product(bool, PreserveAllAnnotations, false,                              \
 887           "Preserve RuntimeInvisibleAnnotations as well "                   \
 888           "as RuntimeVisibleAnnotations")                                   \
 889                                                                             \
 890   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 891           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 892                                                                             \
 893   product(bool, UseXMMForArrayCopy, false,                                  \
 894           "Use SSE2 MOVQ instruction for Arraycopy")                        \
 895                                                                             \
 896   product(intx, FieldsAllocationStyle, 1,                                   \
 897           "0 - type based with oops first, "                                \
 898           "1 - with oops last, "                                            \
 899           "2 - oops in super and sub classes are together")                 \
 900           range(0, 2)                                                       \
 901                                                                             \
 902   product(bool, CompactFields, true,                                        \
 903           "Allocate nonstatic fields in gaps between previous fields")      \
 904                                                                             \
 905   notproduct(bool, PrintFieldLayout, false,                                 \
 906           "Print field layout for each class")                              \
 907                                                                             \
 908   /* Need to limit the extent of the padding to reasonable size.          */\
 909   /* 8K is well beyond the reasonable HW cache line size, even with       */\
 910   /* aggressive prefetching, while still leaving the room for segregating */\
 911   /* among the distinct pages.                                            */\
 912   product(intx, ContendedPaddingWidth, 128,                                 \
 913           "How many bytes to pad the fields/classes marked @Contended with")\
 914           range(0, 8192)                                                    \
 915           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
 916                                                                             \
 917   product(bool, EnableContended, true,                                      \
 918           "Enable @Contended annotation support")                           \
 919                                                                             \
 920   product(bool, RestrictContended, true,                                    \
 921           "Restrict @Contended to trusted classes")                         \
 922                                                                             \
 923   product(bool, UseBiasedLocking, true,                                     \
 924           "Enable biased locking in JVM")                                   \
 925                                                                             \
 926   product(intx, BiasedLockingStartupDelay, 0,                               \
 927           "Number of milliseconds to wait before enabling biased locking")  \
 928           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
 929           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
 930                                                                             \
 931   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
 932           "Print statistics of biased locking in JVM")                      \
 933                                                                             \
 934   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
 935           "Threshold of number of revocations per type to try to "          \
 936           "rebias all objects in the heap of that type")                    \
 937           range(0, max_intx)                                                \
 938           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
 939                                                                             \
 940   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
 941           "Threshold of number of revocations per type to permanently "     \
 942           "revoke biases of all objects in the heap of that type")          \
 943           range(0, max_intx)                                                \
 944           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
 945                                                                             \
 946   product(intx, BiasedLockingDecayTime, 25000,                              \
 947           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
 948           "type after previous bulk rebias")                                \
 949           range(500, max_intx)                                              \
 950           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
 951                                                                             \
 952   product(bool, ExitOnOutOfMemoryError, false,                              \
 953           "JVM exits on the first occurrence of an out-of-memory error")    \
 954                                                                             \
 955   product(bool, CrashOnOutOfMemoryError, false,                             \
 956           "JVM aborts, producing an error log and core/mini dump, on the "  \
 957           "first occurrence of an out-of-memory error")                     \
 958                                                                             \
 959   /* tracing */                                                             \
 960                                                                             \
 961   develop(bool, StressRewriter, false,                                      \
 962           "Stress linktime bytecode rewriting")                             \
 963                                                                             \
 964   product(ccstr, TraceJVMTI, NULL,                                          \
 965           "Trace flags for JVMTI functions and events")                     \
 966                                                                             \
 967   /* This option can change an EMCP method into an obsolete method. */      \
 968   /* This can affect tests that except specific methods to be EMCP. */      \
 969   /* This option should be used with caution.                       */      \
 970   product(bool, StressLdcRewrite, false,                                    \
 971           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
 972                                                                             \
 973   /* change to false by default sometime after Mustang */                   \
 974   product(bool, VerifyMergedCPBytecodes, true,                              \
 975           "Verify bytecodes after RedefineClasses constant pool merging")   \
 976                                                                             \
 977   develop(bool, TraceBytecodes, false,                                      \
 978           "Trace bytecode execution")                                       \
 979                                                                             \
 980   develop(bool, TraceICs, false,                                            \
 981           "Trace inline cache changes")                                     \
 982                                                                             \
 983   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
 984           "Trace method invocation counter overflow")                       \
 985                                                                             \
 986   develop(bool, TraceInlineCacheClearing, false,                            \
 987           "Trace clearing of inline caches in nmethods")                    \
 988                                                                             \
 989   develop(bool, TraceDependencies, false,                                   \
 990           "Trace dependencies")                                             \
 991                                                                             \
 992   develop(bool, VerifyDependencies, trueInDebug,                            \
 993           "Exercise and verify the compilation dependency mechanism")       \
 994                                                                             \
 995   develop(bool, TraceNewOopMapGeneration, false,                            \
 996           "Trace OopMapGeneration")                                         \
 997                                                                             \
 998   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
 999           "Trace OopMapGeneration: print detailed cell states")             \
1000                                                                             \
1001   develop(bool, TimeOopMap, false,                                          \
1002           "Time calls to GenerateOopMap::compute_map() in sum")             \
1003                                                                             \
1004   develop(bool, TimeOopMap2, false,                                         \
1005           "Time calls to GenerateOopMap::compute_map() individually")       \
1006                                                                             \
1007   develop(bool, TraceOopMapRewrites, false,                                 \
1008           "Trace rewriting of method oops during oop map generation")       \
1009                                                                             \
1010   develop(bool, TraceICBuffer, false,                                       \
1011           "Trace usage of IC buffer")                                       \
1012                                                                             \
1013   develop(bool, TraceCompiledIC, false,                                     \
1014           "Trace changes of compiled IC")                                   \
1015                                                                             \
1016   develop(bool, FLSVerifyDictionary, false,                                 \
1017           "Do lots of (expensive) FLS dictionary verification")             \
1018                                                                             \
1019                                                                             \
1020   notproduct(bool, CheckMemoryInitialization, false,                        \
1021           "Check memory initialization")                                    \
1022                                                                             \
1023   product(uintx, ProcessDistributionStride, 4,                              \
1024           "Stride through processors when distributing processes")          \
1025           range(0, max_juint)                                               \
1026                                                                             \
1027   develop(bool, TraceFinalizerRegistration, false,                          \
1028           "Trace registration of final references")                         \
1029                                                                             \
1030   product(bool, IgnoreEmptyClassPaths, false,                               \
1031           "Ignore empty path elements in -classpath")                       \
1032                                                                             \
1033   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
1034           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
1035           "Initial size of the boot class loader data metaspace")           \
1036           range(30*K, max_uintx/BytesPerWord)                               \
1037           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
1038                                                                             \
1039   product(bool, PrintHeapAtSIGBREAK, true,                                  \
1040           "Print heap layout in response to SIGBREAK")                      \
1041                                                                             \
1042   manageable(bool, PrintClassHistogram, false,                              \
1043           "Print a histogram of class instances")                           \
1044                                                                             \
1045   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
1046           "The percentage of the used heap that the instances of a class "  \
1047           "must occupy for the class to generate a trace event")            \
1048           range(0.0, 100.0)                                                 \
1049                                                                             \
1050   /* JVMTI heap profiling */                                                \
1051                                                                             \
1052   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
1053           "Trace JVMTI object tagging calls")                               \
1054                                                                             \
1055   diagnostic(bool, VerifyBeforeIteration, false,                            \
1056           "Verify memory system before JVMTI iteration")                    \
1057                                                                             \
1058   /* compiler interface */                                                  \
1059                                                                             \
1060   develop(bool, CIPrintCompilerName, false,                                 \
1061           "when CIPrint is active, print the name of the active compiler")  \
1062                                                                             \
1063   diagnostic(bool, CIPrintCompileQueue, false,                              \
1064           "display the contents of the compile queue whenever a "           \
1065           "compilation is enqueued")                                        \
1066                                                                             \
1067   develop(bool, CIPrintRequests, false,                                     \
1068           "display every request for compilation")                          \
1069                                                                             \
1070   product(bool, CITime, false,                                              \
1071           "collect timing information for compilation")                     \
1072                                                                             \
1073   develop(bool, CITimeVerbose, false,                                       \
1074           "be more verbose in compilation timings")                         \
1075                                                                             \
1076   develop(bool, CITimeEach, false,                                          \
1077           "display timing information after each successful compilation")   \
1078                                                                             \
1079   develop(bool, CICountOSR, false,                                          \
1080           "use a separate counter when assigning ids to osr compilations")  \
1081                                                                             \
1082   develop(bool, CICompileNatives, true,                                     \
1083           "compile native methods if supported by the compiler")            \
1084                                                                             \
1085   develop_pd(bool, CICompileOSR,                                            \
1086           "compile on stack replacement methods if supported by the "       \
1087           "compiler")                                                       \
1088                                                                             \
1089   develop(bool, CIPrintMethodCodes, false,                                  \
1090           "print method bytecodes of the compiled code")                    \
1091                                                                             \
1092   develop(bool, CIPrintTypeFlow, false,                                     \
1093           "print the results of ciTypeFlow analysis")                       \
1094                                                                             \
1095   develop(bool, CITraceTypeFlow, false,                                     \
1096           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
1097                                                                             \
1098   develop(intx, OSROnlyBCI, -1,                                             \
1099           "OSR only at this bci.  Negative values mean exclude that bci")   \
1100                                                                             \
1101   /* compiler */                                                            \
1102                                                                             \
1103   /* notice: the max range value here is max_jint, not max_intx  */         \
1104   /* because of overflow issue                                   */         \
1105   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
1106           "Number of compiler threads to run")                              \
1107           range(0, max_jint)                                                \
1108           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
1109                                                                             \
1110   product(bool, UseDynamicNumberOfCompilerThreads, true,                    \
1111           "Dynamically choose the number of parallel compiler threads")     \
1112                                                                             \
1113   diagnostic(bool, ReduceNumberOfCompilerThreads, true,                     \
1114              "Reduce the number of parallel compiler threads when they "    \
1115              "are not used")                                                \
1116                                                                             \
1117   diagnostic(bool, TraceCompilerThreads, false,                             \
1118              "Trace creation and removal of compiler threads")              \
1119                                                                             \
1120   develop(bool, InjectCompilerCreationFailure, false,                       \
1121           "Inject thread creation failures for "                            \
1122           "UseDynamicNumberOfCompilerThreads")                              \
1123                                                                             \
1124   product(intx, CompilationPolicyChoice, 0,                                 \
1125           "which compilation policy (0-2)")                                 \
1126           range(0, 2)                                                       \
1127                                                                             \
1128   develop(bool, UseStackBanging, true,                                      \
1129           "use stack banging for stack overflow checks (required for "      \
1130           "proper StackOverflow handling; disable only to measure cost "    \
1131           "of stackbanging)")                                               \
1132                                                                             \
1133   develop(bool, UseStrictFP, true,                                          \
1134           "use strict fp if modifier strictfp is set")                      \
1135                                                                             \
1136   develop(bool, GenerateSynchronizationCode, true,                          \
1137           "generate locking/unlocking code for synchronized methods and "   \
1138           "monitors")                                                       \
1139                                                                             \
1140   develop(bool, GenerateRangeChecks, true,                                  \
1141           "Generate range checks for array accesses")                       \
1142                                                                             \
1143   diagnostic_pd(bool, ImplicitNullChecks,                                   \
1144           "Generate code for implicit null checks")                         \
1145                                                                             \
1146   product_pd(bool, TrapBasedNullChecks,                                     \
1147           "Generate code for null checks that uses a cmp and trap "         \
1148           "instruction raising SIGTRAP.  This is only used if an access to" \
1149           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
1150           "ImplicitNullChecks don't work (PPC64).")                         \
1151                                                                             \
1152   diagnostic(bool, EnableThreadSMRExtraValidityChecks, true,                \
1153              "Enable Thread SMR extra validity checks")                     \
1154                                                                             \
1155   diagnostic(bool, EnableThreadSMRStatistics, trueInDebug,                  \
1156              "Enable Thread SMR Statistics")                                \
1157                                                                             \
1158   product(bool, Inline, true,                                               \
1159           "Enable inlining")                                                \
1160                                                                             \
1161   product(bool, ClipInlining, true,                                         \
1162           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
1163                                                                             \
1164   develop(bool, UseCHA, true,                                               \
1165           "Enable CHA")                                                     \
1166                                                                             \
1167   product(bool, UseTypeProfile, true,                                       \
1168           "Check interpreter profile for historically monomorphic calls")   \
1169                                                                             \
1170   diagnostic(bool, PrintInlining, false,                                    \
1171           "Print inlining optimizations")                                   \
1172                                                                             \
1173   product(bool, UsePopCountInstruction, false,                              \
1174           "Use population count instruction")                               \
1175                                                                             \
1176   develop(bool, EagerInitialization, false,                                 \
1177           "Eagerly initialize classes if possible")                         \
1178                                                                             \
1179   diagnostic(bool, LogTouchedMethods, false,                                \
1180           "Log methods which have been ever touched in runtime")            \
1181                                                                             \
1182   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
1183           "Print all methods that have been ever touched in runtime")       \
1184                                                                             \
1185   develop(bool, TraceMethodReplacement, false,                              \
1186           "Print when methods are replaced do to recompilation")            \
1187                                                                             \
1188   develop(bool, PrintMethodFlushing, false,                                 \
1189           "Print the nmethods being flushed")                               \
1190                                                                             \
1191   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
1192           "print statistics about method flushing")                         \
1193                                                                             \
1194   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
1195           "Number of compiled code invocations after which "                \
1196           "the method is considered as hot by the flusher")                 \
1197           range(1, max_jint)                                                \
1198                                                                             \
1199   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
1200           "Minimum number of sweeper passes before an nmethod "             \
1201           "can be flushed")                                                 \
1202           range(0, max_intx)                                                \
1203                                                                             \
1204   product(bool, UseCodeAging, true,                                         \
1205           "Insert counter to detect warm methods")                          \
1206                                                                             \
1207   diagnostic(bool, StressCodeAging, false,                                  \
1208           "Start with counters compiled in")                                \
1209                                                                             \
1210   develop(bool, StressCodeBuffers, false,                                   \
1211           "Exercise code buffer expansion and other rare state changes")    \
1212                                                                             \
1213   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
1214           "Generate extra debugging information for non-safepoints in "     \
1215           "nmethods")                                                       \
1216                                                                             \
1217   product(bool, PrintVMOptions, false,                                      \
1218           "Print flags that appeared on the command line")                  \
1219                                                                             \
1220   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
1221           "Ignore unrecognized VM options")                                 \
1222                                                                             \
1223   product(bool, PrintCommandLineFlags, false,                               \
1224           "Print flags specified on command line or set by ergonomics")     \
1225                                                                             \
1226   product(bool, PrintFlagsInitial, false,                                   \
1227           "Print all VM flags before argument processing and exit VM")      \
1228                                                                             \
1229   product(bool, PrintFlagsFinal, false,                                     \
1230           "Print all VM flags after argument and ergonomic processing")     \
1231                                                                             \
1232   notproduct(bool, PrintFlagsWithComments, false,                           \
1233           "Print all VM flags with default values and descriptions and "    \
1234           "exit")                                                           \
1235                                                                             \
1236   product(bool, PrintFlagsRanges, false,                                    \
1237           "Print VM flags and their ranges and exit VM")                    \
1238                                                                             \
1239   diagnostic(bool, SerializeVMOutput, true,                                 \
1240           "Use a mutex to serialize output to tty and LogFile")             \
1241                                                                             \
1242   diagnostic(bool, DisplayVMOutput, true,                                   \
1243           "Display all VM output on the tty, independently of LogVMOutput") \
1244                                                                             \
1245   diagnostic(bool, LogVMOutput, false,                                      \
1246           "Save VM output to LogFile")                                      \
1247                                                                             \
1248   diagnostic(ccstr, LogFile, NULL,                                          \
1249           "If LogVMOutput or LogCompilation is on, save VM output to "      \
1250           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1251                                                                             \
1252   product(ccstr, ErrorFile, NULL,                                           \
1253           "If an error occurs, save the error data to this file "           \
1254           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
1255                                                                             \
1256   product(bool, ExtensiveErrorReports,                                      \
1257           PRODUCT_ONLY(false) NOT_PRODUCT(true),                            \
1258           "Error reports are more extensive.")                              \
1259                                                                             \
1260   product(bool, DisplayVMOutputToStderr, false,                             \
1261           "If DisplayVMOutput is true, display all VM output to stderr")    \
1262                                                                             \
1263   product(bool, DisplayVMOutputToStdout, false,                             \
1264           "If DisplayVMOutput is true, display all VM output to stdout")    \
1265                                                                             \
1266   product(bool, UseHeavyMonitors, false,                                    \
1267           "use heavyweight instead of lightweight Java monitors")           \
1268                                                                             \
1269   product(bool, PrintStringTableStatistics, false,                          \
1270           "print statistics about the StringTable and SymbolTable")         \
1271                                                                             \
1272   diagnostic(bool, VerifyStringTableAtExit, false,                          \
1273           "verify StringTable contents at exit")                            \
1274                                                                             \
1275   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
1276           "print histogram of the symbol table")                            \
1277                                                                             \
1278   notproduct(bool, ExitVMOnVerifyError, false,                              \
1279           "standard exit from VM if bytecode verify error "                 \
1280           "(only in debug mode)")                                           \
1281                                                                             \
1282   diagnostic(ccstr, AbortVMOnException, NULL,                               \
1283           "Call fatal if this exception is thrown.  Example: "              \
1284           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1285                                                                             \
1286   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
1287           "Call fatal if the exception pointed by AbortVMOnException "      \
1288           "has this message")                                               \
1289                                                                             \
1290   develop(bool, DebugVtables, false,                                        \
1291           "add debugging code to vtable dispatch")                          \
1292                                                                             \
1293   notproduct(bool, PrintVtableStats, false,                                 \
1294           "print vtables stats at end of run")                              \
1295                                                                             \
1296   develop(bool, TraceCreateZombies, false,                                  \
1297           "trace creation of zombie nmethods")                              \
1298                                                                             \
1299   notproduct(bool, IgnoreLockingAssertions, false,                          \
1300           "disable locking assertions (for speed)")                         \
1301                                                                             \
1302   product(bool, RangeCheckElimination, true,                                \
1303           "Eliminate range checks")                                         \
1304                                                                             \
1305   develop_pd(bool, UncommonNullCast,                                        \
1306           "track occurrences of null in casts; adjust compiler tactics")    \
1307                                                                             \
1308   develop(bool, TypeProfileCasts,  true,                                    \
1309           "treat casts like calls for purposes of type profiling")          \
1310                                                                             \
1311   develop(bool, TraceLivenessGen, false,                                    \
1312           "Trace the generation of liveness analysis information")          \
1313                                                                             \
1314   notproduct(bool, TraceLivenessQuery, false,                               \
1315           "Trace queries of liveness analysis information")                 \
1316                                                                             \
1317   notproduct(bool, CollectIndexSetStatistics, false,                        \
1318           "Collect information about IndexSets")                            \
1319                                                                             \
1320   develop(bool, UseLoopSafepoints, true,                                    \
1321           "Generate Safepoint nodes in every loop")                         \
1322                                                                             \
1323   develop(intx, FastAllocateSizeLimit, 128*K,                               \
1324           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
1325           "Inline allocations larger than this in doublewords must go slow")\
1326                                                                             \
1327   product_pd(bool, CompactStrings,                                          \
1328           "Enable Strings to use single byte chars in backing store")       \
1329                                                                             \
1330   product_pd(uintx, TypeProfileLevel,                                       \
1331           "=XYZ, with Z: Type profiling of arguments at call; "             \
1332                      "Y: Type profiling of return value at call; "          \
1333                      "X: Type profiling of parameters to methods; "         \
1334           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
1335           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
1336                                                                             \
1337   product(intx, TypeProfileArgsLimit,     2,                                \
1338           "max number of call arguments to consider for type profiling")    \
1339           range(0, 16)                                                      \
1340                                                                             \
1341   product(intx, TypeProfileParmsLimit,    2,                                \
1342           "max number of incoming parameters to consider for type profiling"\
1343           ", -1 for all")                                                   \
1344           range(-1, 64)                                                     \
1345                                                                             \
1346   /* statistics */                                                          \
1347   develop(bool, CountCompiledCalls, false,                                  \
1348           "Count method invocations")                                       \
1349                                                                             \
1350   notproduct(bool, CountRuntimeCalls, false,                                \
1351           "Count VM runtime calls")                                         \
1352                                                                             \
1353   develop(bool, CountJNICalls, false,                                       \
1354           "Count jni method invocations")                                   \
1355                                                                             \
1356   notproduct(bool, CountJVMCalls, false,                                    \
1357           "Count jvm method invocations")                                   \
1358                                                                             \
1359   notproduct(bool, CountRemovableExceptions, false,                         \
1360           "Count exceptions that could be replaced by branches due to "     \
1361           "inlining")                                                       \
1362                                                                             \
1363   notproduct(bool, ICMissHistogram, false,                                  \
1364           "Produce histogram of IC misses")                                 \
1365                                                                             \
1366   /* interpreter */                                                         \
1367   product_pd(bool, RewriteBytecodes,                                        \
1368           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
1369                                                                             \
1370   product_pd(bool, RewriteFrequentPairs,                                    \
1371           "Rewrite frequently used bytecode pairs into a single bytecode")  \
1372                                                                             \
1373   diagnostic(bool, PrintInterpreter, false,                                 \
1374           "Print the generated interpreter code")                           \
1375                                                                             \
1376   product(bool, UseInterpreter, true,                                       \
1377           "Use interpreter for non-compiled methods")                       \
1378                                                                             \
1379   develop(bool, UseFastSignatureHandlers, true,                             \
1380           "Use fast signature handlers for native calls")                   \
1381                                                                             \
1382   product(bool, UseLoopCounter, true,                                       \
1383           "Increment invocation counter on backward branch")                \
1384                                                                             \
1385   product_pd(bool, UseOnStackReplacement,                                   \
1386           "Use on stack replacement, calls runtime if invoc. counter "      \
1387           "overflows in loop")                                              \
1388                                                                             \
1389   notproduct(bool, TraceOnStackReplacement, false,                          \
1390           "Trace on stack replacement")                                     \
1391                                                                             \
1392   product_pd(bool, PreferInterpreterNativeStubs,                            \
1393           "Use always interpreter stubs for native methods invoked via "    \
1394           "interpreter")                                                    \
1395                                                                             \
1396   develop(bool, CountBytecodes, false,                                      \
1397           "Count number of bytecodes executed")                             \
1398                                                                             \
1399   develop(bool, PrintBytecodeHistogram, false,                              \
1400           "Print histogram of the executed bytecodes")                      \
1401                                                                             \
1402   develop(bool, PrintBytecodePairHistogram, false,                          \
1403           "Print histogram of the executed bytecode pairs")                 \
1404                                                                             \
1405   diagnostic(bool, PrintSignatureHandlers, false,                           \
1406           "Print code generated for native method signature handlers")      \
1407                                                                             \
1408   develop(bool, VerifyOops, false,                                          \
1409           "Do plausibility checks for oops")                                \
1410                                                                             \
1411   develop(bool, CheckUnhandledOops, false,                                  \
1412           "Check for unhandled oops in VM code")                            \
1413                                                                             \
1414   develop(bool, VerifyJNIFields, trueInDebug,                               \
1415           "Verify jfieldIDs for instance fields")                           \
1416                                                                             \
1417   notproduct(bool, VerifyJNIEnvThread, false,                               \
1418           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
1419           "from JNI")                                                       \
1420                                                                             \
1421   develop(bool, VerifyFPU, false,                                           \
1422           "Verify FPU state (check for NaN's, etc.)")                       \
1423                                                                             \
1424   develop(bool, VerifyThread, false,                                        \
1425           "Watch the thread register for corruption (SPARC only)")          \
1426                                                                             \
1427   develop(bool, VerifyActivationFrameSize, false,                           \
1428           "Verify that activation frame didn't become smaller than its "    \
1429           "minimal size")                                                   \
1430                                                                             \
1431   develop(bool, TraceFrequencyInlining, false,                              \
1432           "Trace frequency based inlining")                                 \
1433                                                                             \
1434   develop_pd(bool, InlineIntrinsics,                                        \
1435           "Inline intrinsics that can be statically resolved")              \
1436                                                                             \
1437   product_pd(bool, ProfileInterpreter,                                      \
1438           "Profile at the bytecode level during interpretation")            \
1439                                                                             \
1440   develop(bool, TraceProfileInterpreter, false,                             \
1441           "Trace profiling at the bytecode level during interpretation. "   \
1442           "This outputs the profiling information collected to improve "    \
1443           "jit compilation.")                                               \
1444                                                                             \
1445   develop_pd(bool, ProfileTraps,                                            \
1446           "Profile deoptimization traps at the bytecode level")             \
1447                                                                             \
1448   product(intx, ProfileMaturityPercentage, 20,                              \
1449           "number of method invocations/branches (expressed as % of "       \
1450           "CompileThreshold) before using the method's profile")            \
1451           range(0, 100)                                                     \
1452                                                                             \
1453   diagnostic(bool, PrintMethodData, false,                                  \
1454           "Print the results of +ProfileInterpreter at end of run")         \
1455                                                                             \
1456   develop(bool, VerifyDataPointer, trueInDebug,                             \
1457           "Verify the method data pointer during interpreter profiling")    \
1458                                                                             \
1459   develop(bool, VerifyCompiledCode, false,                                  \
1460           "Include miscellaneous runtime verifications in nmethod code; "   \
1461           "default off because it disturbs nmethod size heuristics")        \
1462                                                                             \
1463   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
1464           "Manually make GC thread crash then dump java stack trace;  "     \
1465           "Test only")                                                      \
1466                                                                             \
1467   /* compilation */                                                         \
1468   product(bool, UseCompiler, true,                                          \
1469           "Use Just-In-Time compilation")                                   \
1470                                                                             \
1471   product(bool, UseCounterDecay, true,                                      \
1472           "Adjust recompilation counters")                                  \
1473                                                                             \
1474   develop(intx, CounterHalfLifeTime,    30,                                 \
1475           "Half-life time of invocation counters (in seconds)")             \
1476                                                                             \
1477   develop(intx, CounterDecayMinIntervalLength,   500,                       \
1478           "The minimum interval (in milliseconds) between invocation of "   \
1479           "CounterDecay")                                                   \
1480                                                                             \
1481   product(bool, AlwaysCompileLoopMethods, false,                            \
1482           "When using recompilation, never interpret methods "              \
1483           "containing loops")                                               \
1484                                                                             \
1485   product(bool, DontCompileHugeMethods, true,                               \
1486           "Do not compile methods > HugeMethodLimit")                       \
1487                                                                             \
1488   /* Bytecode escape analysis estimation. */                                \
1489   product(bool, EstimateArgEscape, true,                                    \
1490           "Analyze bytecodes to estimate escape state of arguments")        \
1491                                                                             \
1492   product(intx, BCEATraceLevel, 0,                                          \
1493           "How much tracing to do of bytecode escape analysis estimates "   \
1494           "(0-3)")                                                          \
1495           range(0, 3)                                                       \
1496                                                                             \
1497   product(intx, MaxBCEAEstimateLevel, 5,                                    \
1498           "Maximum number of nested calls that are analyzed by BC EA")      \
1499           range(0, max_jint)                                                \
1500                                                                             \
1501   product(intx, MaxBCEAEstimateSize, 150,                                   \
1502           "Maximum bytecode size of a method to be analyzed by BC EA")      \
1503           range(0, max_jint)                                                \
1504                                                                             \
1505   product(intx,  AllocatePrefetchStyle, 1,                                  \
1506           "0 = no prefetch, "                                               \
1507           "1 = generate prefetch instructions for each allocation, "        \
1508           "2 = use TLAB watermark to gate allocation prefetch, "            \
1509           "3 = generate one prefetch instruction per cache line")           \
1510           range(0, 3)                                                       \
1511                                                                             \
1512   product(intx,  AllocatePrefetchDistance, -1,                              \
1513           "Distance to prefetch ahead of allocation pointer. "              \
1514           "-1: use system-specific value (automatically determined")        \
1515           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
1516                                                                             \
1517   product(intx,  AllocatePrefetchLines, 3,                                  \
1518           "Number of lines to prefetch ahead of array allocation pointer")  \
1519           range(1, 64)                                                      \
1520                                                                             \
1521   product(intx,  AllocateInstancePrefetchLines, 1,                          \
1522           "Number of lines to prefetch ahead of instance allocation "       \
1523           "pointer")                                                        \
1524           range(1, 64)                                                      \
1525                                                                             \
1526   product(intx,  AllocatePrefetchStepSize, 16,                              \
1527           "Step size in bytes of sequential prefetch instructions")         \
1528           range(1, 512)                                                     \
1529           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1530                                                                             \
1531   product(intx,  AllocatePrefetchInstr, 0,                                  \
1532           "Select instruction to prefetch ahead of allocation pointer")     \
1533           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
1534                                                                             \
1535   /* deoptimization */                                                      \
1536   develop(bool, TraceDeoptimization, false,                                 \
1537           "Trace deoptimization")                                           \
1538                                                                             \
1539   develop(bool, PrintDeoptimizationDetails, false,                          \
1540           "Print more information about deoptimization")                    \
1541                                                                             \
1542   develop(bool, DebugDeoptimization, false,                                 \
1543           "Tracing various information while debugging deoptimization")     \
1544                                                                             \
1545   product(intx, SelfDestructTimer, 0,                                       \
1546           "Will cause VM to terminate after a given time (in minutes) "     \
1547           "(0 means off)")                                                  \
1548           range(0, max_intx)                                                \
1549                                                                             \
1550   product(intx, MaxJavaStackTraceDepth, 1024,                               \
1551           "The maximum number of lines in the stack trace for Java "        \
1552           "exceptions (0 means all)")                                       \
1553           range(0, max_jint/2)                                              \
1554                                                                             \
1555   /* notice: the max range value here is max_jint, not max_intx  */         \
1556   /* because of overflow issue                                   */         \
1557   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
1558           "Guarantee a safepoint (at least) every so many milliseconds "    \
1559           "(0 means none)")                                                 \
1560           range(0, max_jint)                                                \
1561                                                                             \
1562   product(intx, SafepointTimeoutDelay, 10000,                               \
1563           "Delay in milliseconds for option SafepointTimeout")              \
1564   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
1565   NOT_LP64(range(0, max_intx))                                              \
1566                                                                             \
1567   product(intx, NmethodSweepActivity, 10,                                   \
1568           "Removes cold nmethods from code cache if > 0. Higher values "    \
1569           "result in more aggressive sweeping")                             \
1570           range(0, 2000)                                                    \
1571                                                                             \
1572   notproduct(bool, LogSweeper, false,                                       \
1573           "Keep a ring buffer of sweeper activity")                         \
1574                                                                             \
1575   notproduct(intx, SweeperLogEntries, 1024,                                 \
1576           "Number of records in the ring buffer of sweeper activity")       \
1577                                                                             \
1578   notproduct(intx, MemProfilingInterval, 500,                               \
1579           "Time between each invocation of the MemProfiler")                \
1580                                                                             \
1581   develop(intx, MallocCatchPtr, -1,                                         \
1582           "Hit breakpoint when mallocing/freeing this pointer")             \
1583                                                                             \
1584   notproduct(ccstrlist, SuppressErrorAt, "",                                \
1585           "List of assertions (file:line) to muzzle")                       \
1586                                                                             \
1587   develop(intx, StackPrintLimit, 100,                                       \
1588           "number of stack frames to print in VM-level stack dump")         \
1589                                                                             \
1590   notproduct(intx, MaxElementPrintSize, 256,                                \
1591           "maximum number of elements to print")                            \
1592                                                                             \
1593   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
1594           "maximum number of subklasses to print when printing klass")      \
1595                                                                             \
1596   product(intx, MaxInlineLevel, 9,                                          \
1597           "maximum number of nested calls that are inlined")                \
1598           range(0, max_jint)                                                \
1599                                                                             \
1600   product(intx, MaxRecursiveInlineLevel, 1,                                 \
1601           "maximum number of nested recursive calls that are inlined")      \
1602           range(0, max_jint)                                                \
1603                                                                             \
1604   develop(intx, MaxForceInlineLevel, 100,                                   \
1605           "maximum number of nested calls that are forced for inlining "    \
1606           "(using CompileCommand or marked w/ @ForceInline)")               \
1607           range(0, max_jint)                                                \
1608                                                                             \
1609   product_pd(intx, InlineSmallCode,                                         \
1610           "Only inline already compiled methods if their code size is "     \
1611           "less than this")                                                 \
1612           range(0, max_jint)                                                \
1613                                                                             \
1614   product(intx, MaxInlineSize, 35,                                          \
1615           "The maximum bytecode size of a method to be inlined")            \
1616           range(0, max_jint)                                                \
1617                                                                             \
1618   product_pd(intx, FreqInlineSize,                                          \
1619           "The maximum bytecode size of a frequent method to be inlined")   \
1620           range(0, max_jint)                                                \
1621                                                                             \
1622   product(intx, MaxTrivialSize, 6,                                          \
1623           "The maximum bytecode size of a trivial method to be inlined")    \
1624           range(0, max_jint)                                                \
1625                                                                             \
1626   product(intx, MinInliningThreshold, 250,                                  \
1627           "The minimum invocation count a method needs to have to be "      \
1628           "inlined")                                                        \
1629           range(0, max_jint)                                                \
1630                                                                             \
1631   develop(intx, MethodHistogramCutoff, 100,                                 \
1632           "The cutoff value for method invocation histogram (+CountCalls)") \
1633                                                                             \
1634   develop(intx, DontYieldALotInterval,    10,                               \
1635           "Interval between which yields will be dropped (milliseconds)")   \
1636                                                                             \
1637   notproduct(intx, DeoptimizeALotInterval,     5,                           \
1638           "Number of exits until DeoptimizeALot kicks in")                  \
1639                                                                             \
1640   notproduct(intx, ZombieALotInterval,     5,                               \
1641           "Number of exits until ZombieALot kicks in")                      \
1642                                                                             \
1643   diagnostic(uintx, MallocMaxTestWords,     0,                              \
1644           "If non-zero, maximum number of words that malloc/realloc can "   \
1645           "allocate (for testing only)")                                    \
1646           range(0, max_uintx)                                               \
1647                                                                             \
1648   product(intx, TypeProfileWidth, 2,                                        \
1649           "Number of receiver types to record in call/cast profile")        \
1650           range(0, 8)                                                       \
1651                                                                             \
1652   develop(intx, BciProfileWidth,      2,                                    \
1653           "Number of return bci's to record in ret profile")                \
1654                                                                             \
1655   product(intx, PerMethodRecompilationCutoff, 400,                          \
1656           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1657           range(-1, max_intx)                                               \
1658                                                                             \
1659   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
1660           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
1661           range(-1, max_intx)                                               \
1662                                                                             \
1663   product(intx, PerMethodTrapLimit,  100,                                   \
1664           "Limit on traps (of one kind) in a method (includes inlines)")    \
1665           range(0, max_jint)                                                \
1666                                                                             \
1667   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
1668           "Limit on speculative traps (of one kind) in a method "           \
1669           "(includes inlines)")                                             \
1670           range(0, max_jint)                                                \
1671                                                                             \
1672   product(intx, PerBytecodeTrapLimit,  4,                                   \
1673           "Limit on traps (of one kind) at a particular BCI")               \
1674           range(0, max_jint)                                                \
1675                                                                             \
1676   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
1677           "Extra method data trap entries for speculation")                 \
1678                                                                             \
1679   develop(intx, InlineFrequencyRatio,    20,                                \
1680           "Ratio of call site execution to caller method invocation")       \
1681           range(0, max_jint)                                                \
1682                                                                             \
1683   diagnostic_pd(intx, InlineFrequencyCount,                                 \
1684           "Count of call site execution necessary to trigger frequent "     \
1685           "inlining")                                                       \
1686           range(0, max_jint)                                                \
1687                                                                             \
1688   develop(intx, InlineThrowCount,    50,                                    \
1689           "Force inlining of interpreted methods that throw this often")    \
1690           range(0, max_jint)                                                \
1691                                                                             \
1692   develop(intx, InlineThrowMaxSize,   200,                                  \
1693           "Force inlining of throwing methods smaller than this")           \
1694           range(0, max_jint)                                                \
1695                                                                             \
1696   develop(intx, ProfilerNodeSize,  1024,                                    \
1697           "Size in K to allocate for the Profile Nodes of each thread")     \
1698           range(0, 1024)                                                    \
1699                                                                             \
1700   product_pd(size_t, MetaspaceSize,                                         \
1701           "Initial threshold (in bytes) at which a garbage collection "     \
1702           "is done to reduce Metaspace usage")                              \
1703           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
1704                                                                             \
1705   product(size_t, MaxMetaspaceSize, max_uintx,                              \
1706           "Maximum size of Metaspaces (in bytes)")                          \
1707           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
1708                                                                             \
1709   product(size_t, CompressedClassSpaceSize, 1*G,                            \
1710           "Maximum size of class area in Metaspace when compressed "        \
1711           "class pointers are used")                                        \
1712           range(1*M, 3*G)                                                   \
1713                                                                             \
1714   manageable(uintx, MinHeapFreeRatio, 40,                                   \
1715           "The minimum percentage of heap free after GC to avoid expansion."\
1716           " For most GCs this applies to the old generation. In G1 and"     \
1717           " ParallelGC it applies to the whole heap.")                      \
1718           range(0, 100)                                                     \
1719           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
1720                                                                             \
1721   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
1722           "The maximum percentage of heap free after GC to avoid shrinking."\
1723           " For most GCs this applies to the old generation. In G1 and"     \
1724           " ParallelGC it applies to the whole heap.")                      \
1725           range(0, 100)                                                     \
1726           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
1727                                                                             \
1728   product(bool, ShrinkHeapInSteps, true,                                    \
1729           "When disabled, informs the GC to shrink the java heap directly"  \
1730           " to the target size at the next full GC rather than requiring"   \
1731           " smaller steps during multiple full GCs.")                       \
1732                                                                             \
1733   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
1734           "Number of milliseconds per MB of free space in the heap")        \
1735           range(0, max_intx)                                                \
1736           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1737                                                                             \
1738   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
1739           "The minimum change in heap space due to GC (in bytes)")          \
1740           range(0, max_uintx)                                               \
1741                                                                             \
1742   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
1743           "The minimum expansion of Metaspace (in bytes)")                  \
1744           range(0, max_uintx)                                               \
1745                                                                             \
1746   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
1747           "The maximum percentage of Metaspace free after GC to avoid "     \
1748           "shrinking")                                                      \
1749           range(0, 100)                                                     \
1750           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1751                                                                             \
1752   product(uintx, MinMetaspaceFreeRatio,    40,                              \
1753           "The minimum percentage of Metaspace free after GC to avoid "     \
1754           "expansion")                                                      \
1755           range(0, 99)                                                      \
1756           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1757                                                                             \
1758   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
1759           "The maximum expansion of Metaspace without full GC (in bytes)")  \
1760           range(0, max_uintx)                                               \
1761                                                                             \
1762   /* stack parameters */                                                    \
1763   product_pd(intx, StackYellowPages,                                        \
1764           "Number of yellow zone (recoverable overflows) pages of size "    \
1765           "4KB. If pages are bigger yellow zone is aligned up.")            \
1766           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
1767                                                                             \
1768   product_pd(intx, StackRedPages,                                           \
1769           "Number of red zone (unrecoverable overflows) pages of size "     \
1770           "4KB. If pages are bigger red zone is aligned up.")               \
1771           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
1772                                                                             \
1773   product_pd(intx, StackReservedPages,                                      \
1774           "Number of reserved zone (reserved to annotated methods) pages"   \
1775           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1776           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1777                                                                             \
1778   product(bool, RestrictReservedStack, true,                                \
1779           "Restrict @ReservedStackAccess to trusted classes")               \
1780                                                                             \
1781   /* greater stack shadow pages can't generate instruction to bang stack */ \
1782   product_pd(intx, StackShadowPages,                                        \
1783           "Number of shadow zone (for overflow checking) pages of size "    \
1784           "4KB. If pages are bigger shadow zone is aligned up. "            \
1785           "This should exceed the depth of the VM and native call stack.")  \
1786           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
1787                                                                             \
1788   product_pd(intx, ThreadStackSize,                                         \
1789           "Thread Stack Size (in Kbytes)")                                  \
1790           range(0, 1 * M)                                                   \
1791                                                                             \
1792   product_pd(intx, VMThreadStackSize,                                       \
1793           "Non-Java Thread Stack Size (in Kbytes)")                         \
1794           range(0, max_intx/(1 * K))                                        \
1795                                                                             \
1796   product_pd(intx, CompilerThreadStackSize,                                 \
1797           "Compiler Thread Stack Size (in Kbytes)")                         \
1798           range(0, max_intx/(1 * K))                                        \
1799                                                                             \
1800   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
1801           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
1802                                                                             \
1803   /* code cache parameters                                    */            \
1804   develop_pd(uintx, CodeCacheSegmentSize,                                   \
1805           "Code cache segment size (in bytes) - smallest unit of "          \
1806           "allocation")                                                     \
1807           range(1, 1024)                                                    \
1808           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
1809                                                                             \
1810   develop_pd(intx, CodeEntryAlignment,                                      \
1811           "Code entry alignment for generated code (in bytes)")             \
1812           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
1813                                                                             \
1814   product_pd(intx, OptoLoopAlignment,                                       \
1815           "Align inner loops to zero relative to this modulus")             \
1816           range(1, 16)                                                      \
1817           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
1818                                                                             \
1819   product_pd(uintx, InitialCodeCacheSize,                                   \
1820           "Initial code cache size (in bytes)")                             \
1821           range(os::vm_page_size(), max_uintx)                              \
1822                                                                             \
1823   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
1824           "Minimum code cache size (in bytes) required to start VM.")       \
1825           range(0, max_uintx)                                               \
1826                                                                             \
1827   product(bool, SegmentedCodeCache, false,                                  \
1828           "Use a segmented code cache")                                     \
1829                                                                             \
1830   product_pd(uintx, ReservedCodeCacheSize,                                  \
1831           "Reserved code cache size (in bytes) - maximum code cache size")  \
1832           range(os::vm_page_size(), max_uintx)                              \
1833                                                                             \
1834   product_pd(uintx, NonProfiledCodeHeapSize,                                \
1835           "Size of code heap with non-profiled methods (in bytes)")         \
1836           range(0, max_uintx)                                               \
1837                                                                             \
1838   product_pd(uintx, ProfiledCodeHeapSize,                                   \
1839           "Size of code heap with profiled methods (in bytes)")             \
1840           range(0, max_uintx)                                               \
1841                                                                             \
1842   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
1843           "Size of code heap with non-nmethods (in bytes)")                 \
1844           range(os::vm_page_size(), max_uintx)                              \
1845                                                                             \
1846   product_pd(uintx, CodeCacheExpansionSize,                                 \
1847           "Code cache expansion size (in bytes)")                           \
1848           range(32*K, max_uintx)                                            \
1849                                                                             \
1850   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
1851           "Minimum number of segments in a code cache block")               \
1852           range(1, 100)                                                     \
1853                                                                             \
1854   notproduct(bool, ExitOnFullCodeCache, false,                              \
1855           "Exit the VM if we fill the code cache")                          \
1856                                                                             \
1857   product(bool, UseCodeCacheFlushing, true,                                 \
1858           "Remove cold/old nmethods from the code cache")                   \
1859                                                                             \
1860   product(uintx, StartAggressiveSweepingAt, 10,                             \
1861           "Start aggressive sweeping if X[%] of the code cache is free."    \
1862           "Segmented code cache: X[%] of the non-profiled heap."            \
1863           "Non-segmented code cache: X[%] of the total code cache")         \
1864           range(0, 100)                                                     \
1865                                                                             \
1866   /* AOT parameters */                                                      \
1867   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
1868           "Use AOT compiled files")                                         \
1869                                                                             \
1870   product(ccstrlist, AOTLibrary, NULL,                                      \
1871           "AOT library")                                                    \
1872                                                                             \
1873   product(bool, PrintAOT, false,                                            \
1874           "Print used AOT klasses and methods")                             \
1875                                                                             \
1876   notproduct(bool, PrintAOTStatistics, false,                               \
1877           "Print AOT statistics")                                           \
1878                                                                             \
1879   diagnostic(bool, UseAOTStrictLoading, false,                              \
1880           "Exit the VM if any of the AOT libraries has invalid config")     \
1881                                                                             \
1882   product(bool, CalculateClassFingerprint, false,                           \
1883           "Calculate class fingerprint")                                    \
1884                                                                             \
1885   /* interpreter debugging */                                               \
1886   develop(intx, BinarySwitchThreshold, 5,                                   \
1887           "Minimal number of lookupswitch entries for rewriting to binary " \
1888           "switch")                                                         \
1889                                                                             \
1890   develop(intx, StopInterpreterAt, 0,                                       \
1891           "Stop interpreter execution at specified bytecode number")        \
1892                                                                             \
1893   develop(intx, TraceBytecodesAt, 0,                                        \
1894           "Trace bytecodes starting with specified bytecode number")        \
1895                                                                             \
1896   /* compiler interface */                                                  \
1897   develop(intx, CIStart, 0,                                                 \
1898           "The id of the first compilation to permit")                      \
1899                                                                             \
1900   develop(intx, CIStop, max_jint,                                           \
1901           "The id of the last compilation to permit")                       \
1902                                                                             \
1903   develop(intx, CIStartOSR, 0,                                              \
1904           "The id of the first osr compilation to permit "                  \
1905           "(CICountOSR must be on)")                                        \
1906                                                                             \
1907   develop(intx, CIStopOSR, max_jint,                                        \
1908           "The id of the last osr compilation to permit "                   \
1909           "(CICountOSR must be on)")                                        \
1910                                                                             \
1911   develop(intx, CIBreakAtOSR, -1,                                           \
1912           "The id of osr compilation to break at")                          \
1913                                                                             \
1914   develop(intx, CIBreakAt, -1,                                              \
1915           "The id of compilation to break at")                              \
1916                                                                             \
1917   product(ccstrlist, CompileOnly, "",                                       \
1918           "List of methods (pkg/class.name) to restrict compilation to")    \
1919                                                                             \
1920   product(ccstr, CompileCommandFile, NULL,                                  \
1921           "Read compiler commands from this file [.hotspot_compiler]")      \
1922                                                                             \
1923   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
1924           "Read compiler directives from this file")                        \
1925                                                                             \
1926   product(ccstrlist, CompileCommand, "",                                    \
1927           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
1928                                                                             \
1929   develop(bool, ReplayCompiles, false,                                      \
1930           "Enable replay of compilations from ReplayDataFile")              \
1931                                                                             \
1932   product(ccstr, ReplayDataFile, NULL,                                      \
1933           "File containing compilation replay information"                  \
1934           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
1935                                                                             \
1936    product(ccstr, InlineDataFile, NULL,                                     \
1937           "File containing inlining replay information"                     \
1938           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
1939                                                                             \
1940   develop(intx, ReplaySuppressInitializers, 2,                              \
1941           "Control handling of class initialization during replay: "        \
1942           "0 - don't do anything special; "                                 \
1943           "1 - treat all class initializers as empty; "                     \
1944           "2 - treat class initializers for application classes as empty; " \
1945           "3 - allow all class initializers to run during bootstrap but "   \
1946           "    pretend they are empty after starting replay")               \
1947           range(0, 3)                                                       \
1948                                                                             \
1949   develop(bool, ReplayIgnoreInitErrors, false,                              \
1950           "Ignore exceptions thrown during initialization for replay")      \
1951                                                                             \
1952   product(bool, DumpReplayDataOnError, true,                                \
1953           "Record replay data for crashing compiler threads")               \
1954                                                                             \
1955   product(bool, CICompilerCountPerCPU, false,                               \
1956           "1 compiler thread for log(N CPUs)")                              \
1957                                                                             \
1958   notproduct(intx, CICrashAt, -1,                                           \
1959           "id of compilation to trigger assert in compiler thread for "     \
1960           "the purpose of testing, e.g. generation of replay data")         \
1961   notproduct(bool, CIObjectFactoryVerify, false,                            \
1962           "enable potentially expensive verification in ciObjectFactory")   \
1963                                                                             \
1964   diagnostic(bool, AbortVMOnCompilationFailure, false,                      \
1965           "Abort VM when method had failed to compile.")                    \
1966                                                                             \
1967   /* Priorities */                                                          \
1968   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
1969                                                                             \
1970   product(intx, ThreadPriorityPolicy, 0,                                    \
1971           "0 : Normal.                                                     "\
1972           "    VM chooses priorities that are appropriate for normal       "\
1973           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
1974           "    to normal native priority. Java priorities below "           \
1975           "    NORM_PRIORITY map to lower native priority values. On       "\
1976           "    Windows applications are allowed to use higher native       "\
1977           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
1978           "    not use the highest possible native priority,               "\
1979           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
1980           "    system threads. On Linux thread priorities are ignored      "\
1981           "    because the OS does not support static priority in          "\
1982           "    SCHED_OTHER scheduling class which is the only choice for   "\
1983           "    non-root, non-realtime applications.                        "\
1984           "1 : Aggressive.                                                 "\
1985           "    Java thread priorities map over to the entire range of      "\
1986           "    native thread priorities. Higher Java thread priorities map "\
1987           "    to higher native thread priorities. This policy should be   "\
1988           "    used with care, as sometimes it can cause performance       "\
1989           "    degradation in the application and/or the entire system. On "\
1990           "    Linux/BSD/macOS this policy requires root privilege or an   "\
1991           "    extended capability.")                                       \
1992           range(0, 1)                                                       \
1993                                                                             \
1994   product(bool, ThreadPriorityVerbose, false,                               \
1995           "Print priority changes")                                         \
1996                                                                             \
1997   product(intx, CompilerThreadPriority, -1,                                 \
1998           "The native priority at which compiler threads should run "       \
1999           "(-1 means no change)")                                           \
2000           range(min_jint, max_jint)                                         \
2001           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
2002                                                                             \
2003   product(intx, VMThreadPriority, -1,                                       \
2004           "The native priority at which the VM thread should run "          \
2005           "(-1 means no change)")                                           \
2006           range(-1, 127)                                                    \
2007                                                                             \
2008   product(intx, JavaPriority1_To_OSPriority, -1,                            \
2009           "Map Java priorities to OS priorities")                           \
2010           range(-1, 127)                                                    \
2011                                                                             \
2012   product(intx, JavaPriority2_To_OSPriority, -1,                            \
2013           "Map Java priorities to OS priorities")                           \
2014           range(-1, 127)                                                    \
2015                                                                             \
2016   product(intx, JavaPriority3_To_OSPriority, -1,                            \
2017           "Map Java priorities to OS priorities")                           \
2018           range(-1, 127)                                                    \
2019                                                                             \
2020   product(intx, JavaPriority4_To_OSPriority, -1,                            \
2021           "Map Java priorities to OS priorities")                           \
2022           range(-1, 127)                                                    \
2023                                                                             \
2024   product(intx, JavaPriority5_To_OSPriority, -1,                            \
2025           "Map Java priorities to OS priorities")                           \
2026           range(-1, 127)                                                    \
2027                                                                             \
2028   product(intx, JavaPriority6_To_OSPriority, -1,                            \
2029           "Map Java priorities to OS priorities")                           \
2030           range(-1, 127)                                                    \
2031                                                                             \
2032   product(intx, JavaPriority7_To_OSPriority, -1,                            \
2033           "Map Java priorities to OS priorities")                           \
2034           range(-1, 127)                                                    \
2035                                                                             \
2036   product(intx, JavaPriority8_To_OSPriority, -1,                            \
2037           "Map Java priorities to OS priorities")                           \
2038           range(-1, 127)                                                    \
2039                                                                             \
2040   product(intx, JavaPriority9_To_OSPriority, -1,                            \
2041           "Map Java priorities to OS priorities")                           \
2042           range(-1, 127)                                                    \
2043                                                                             \
2044   product(intx, JavaPriority10_To_OSPriority,-1,                            \
2045           "Map Java priorities to OS priorities")                           \
2046           range(-1, 127)                                                    \
2047                                                                             \
2048   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
2049           "Java thread priority 10 maps to critical scheduling priority")   \
2050                                                                             \
2051   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
2052           "Compiler thread(s) run at critical scheduling priority")         \
2053                                                                             \
2054   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
2055           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
2056                                                                             \
2057   develop(intx, NewCodeParameter,      0,                                   \
2058           "Testing Only: Create a dedicated integer parameter before "      \
2059           "putback")                                                        \
2060                                                                             \
2061   /* new oopmap storage allocation */                                       \
2062   develop(intx, MinOopMapAllocation,     8,                                 \
2063           "Minimum number of OopMap entries in an OopMapSet")               \
2064                                                                             \
2065   /* Background Compilation */                                              \
2066   develop(intx, LongCompileThreshold,     50,                               \
2067           "Used with +TraceLongCompiles")                                   \
2068                                                                             \
2069   /* recompilation */                                                       \
2070   product_pd(intx, CompileThreshold,                                        \
2071           "number of interpreted method invocations before (re-)compiling") \
2072           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
2073                                                                             \
2074   product(double, CompileThresholdScaling, 1.0,                             \
2075           "Factor to control when first compilation happens "               \
2076           "(both with and without tiered compilation): "                    \
2077           "values greater than 1.0 delay counter overflow, "                \
2078           "values between 0 and 1.0 rush counter overflow, "                \
2079           "value of 1.0 leaves compilation thresholds unchanged "           \
2080           "value of 0.0 is equivalent to -Xint. "                           \
2081           ""                                                                \
2082           "Flag can be set as per-method option. "                          \
2083           "If a value is specified for a method, compilation thresholds "   \
2084           "for that method are scaled by both the value of the global flag "\
2085           "and the value of the per-method flag.")                          \
2086           range(0.0, DBL_MAX)                                               \
2087                                                                             \
2088   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
2089           "Interpreter (tier 0) invocation notification frequency")         \
2090           range(0, 30)                                                      \
2091                                                                             \
2092   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
2093           "C1 without MDO (tier 2) invocation notification frequency")      \
2094           range(0, 30)                                                      \
2095                                                                             \
2096   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
2097           "C1 with MDO profiling (tier 3) invocation notification "         \
2098           "frequency")                                                      \
2099           range(0, 30)                                                      \
2100                                                                             \
2101   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
2102           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
2103           range(0, 30)                                                      \
2104                                                                             \
2105   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
2106           "Interpreter (tier 0) invocation notification frequency")         \
2107           range(0, 30)                                                      \
2108                                                                             \
2109   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
2110           "C1 without MDO (tier 2) invocation notification frequency")      \
2111           range(0, 30)                                                      \
2112                                                                             \
2113   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
2114           "C1 with MDO profiling (tier 3) invocation notification "         \
2115           "frequency")                                                      \
2116           range(0, 30)                                                      \
2117                                                                             \
2118   product(intx, Tier2CompileThreshold, 0,                                   \
2119           "threshold at which tier 2 compilation is invoked")               \
2120           range(0, max_jint)                                                \
2121                                                                             \
2122   product(intx, Tier2BackEdgeThreshold, 0,                                  \
2123           "Back edge threshold at which tier 2 compilation is invoked")     \
2124           range(0, max_jint)                                                \
2125                                                                             \
2126   product(intx, Tier3InvocationThreshold, 200,                              \
2127           "Compile if number of method invocations crosses this "           \
2128           "threshold")                                                      \
2129           range(0, max_jint)                                                \
2130                                                                             \
2131   product(intx, Tier3MinInvocationThreshold, 100,                           \
2132           "Minimum invocation to compile at tier 3")                        \
2133           range(0, max_jint)                                                \
2134                                                                             \
2135   product(intx, Tier3CompileThreshold, 2000,                                \
2136           "Threshold at which tier 3 compilation is invoked (invocation "   \
2137           "minimum must be satisfied)")                                     \
2138           range(0, max_jint)                                                \
2139                                                                             \
2140   product(intx, Tier3BackEdgeThreshold,  60000,                             \
2141           "Back edge threshold at which tier 3 OSR compilation is invoked") \
2142           range(0, max_jint)                                                \
2143                                                                             \
2144   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
2145           "Compile if number of method invocations crosses this "           \
2146           "threshold if coming from AOT")                                   \
2147           range(0, max_jint)                                                \
2148                                                                             \
2149   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
2150           "Minimum invocation to compile at tier 3 if coming from AOT")     \
2151           range(0, max_jint)                                                \
2152                                                                             \
2153   product(intx, Tier3AOTCompileThreshold, 15000,                            \
2154           "Threshold at which tier 3 compilation is invoked (invocation "   \
2155           "minimum must be satisfied) if coming from AOT")                  \
2156           range(0, max_jint)                                                \
2157                                                                             \
2158   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
2159           "Back edge threshold at which tier 3 OSR compilation is invoked " \
2160           "if coming from AOT")                                             \
2161           range(0, max_jint)                                                \
2162                                                                             \
2163   product(intx, Tier4InvocationThreshold, 5000,                             \
2164           "Compile if number of method invocations crosses this "           \
2165           "threshold")                                                      \
2166           range(0, max_jint)                                                \
2167                                                                             \
2168   product(intx, Tier4MinInvocationThreshold, 600,                           \
2169           "Minimum invocation to compile at tier 4")                        \
2170           range(0, max_jint)                                                \
2171                                                                             \
2172   product(intx, Tier4CompileThreshold, 15000,                               \
2173           "Threshold at which tier 4 compilation is invoked (invocation "   \
2174           "minimum must be satisfied")                                      \
2175           range(0, max_jint)                                                \
2176                                                                             \
2177   product(intx, Tier4BackEdgeThreshold, 40000,                              \
2178           "Back edge threshold at which tier 4 OSR compilation is invoked") \
2179           range(0, max_jint)                                                \
2180                                                                             \
2181   product(intx, Tier3DelayOn, 5,                                            \
2182           "If C2 queue size grows over this amount per compiler thread "    \
2183           "stop compiling at tier 3 and start compiling at tier 2")         \
2184           range(0, max_jint)                                                \
2185                                                                             \
2186   product(intx, Tier3DelayOff, 2,                                           \
2187           "If C2 queue size is less than this amount per compiler thread "  \
2188           "allow methods compiled at tier 2 transition to tier 3")          \
2189           range(0, max_jint)                                                \
2190                                                                             \
2191   product(intx, Tier3LoadFeedback, 5,                                       \
2192           "Tier 3 thresholds will increase twofold when C1 queue size "     \
2193           "reaches this amount per compiler thread")                        \
2194           range(0, max_jint)                                                \
2195                                                                             \
2196   product(intx, Tier4LoadFeedback, 3,                                       \
2197           "Tier 4 thresholds will increase twofold when C2 queue size "     \
2198           "reaches this amount per compiler thread")                        \
2199           range(0, max_jint)                                                \
2200                                                                             \
2201   product(intx, TieredCompileTaskTimeout, 50,                               \
2202           "Kill compile task if method was not used within "                \
2203           "given timeout in milliseconds")                                  \
2204           range(0, max_intx)                                                \
2205                                                                             \
2206   product(intx, TieredStopAtLevel, 4,                                       \
2207           "Stop at given compilation level")                                \
2208           range(0, 4)                                                       \
2209                                                                             \
2210   product(intx, Tier0ProfilingStartPercentage, 200,                         \
2211           "Start profiling in interpreter if the counters exceed tier 3 "   \
2212           "thresholds by the specified percentage")                         \
2213           range(0, max_jint)                                                \
2214                                                                             \
2215   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
2216           "Increase the compile threshold for C1 compilation if the code "  \
2217           "cache is filled by the specified percentage")                    \
2218           range(0, 99)                                                      \
2219                                                                             \
2220   product(intx, TieredRateUpdateMinTime, 1,                                 \
2221           "Minimum rate sampling interval (in milliseconds)")               \
2222           range(0, max_intx)                                                \
2223                                                                             \
2224   product(intx, TieredRateUpdateMaxTime, 25,                                \
2225           "Maximum rate sampling interval (in milliseconds)")               \
2226           range(0, max_intx)                                                \
2227                                                                             \
2228   product_pd(bool, TieredCompilation,                                       \
2229           "Enable tiered compilation")                                      \
2230                                                                             \
2231   product(bool, PrintTieredEvents, false,                                   \
2232           "Print tiered events notifications")                              \
2233                                                                             \
2234   product_pd(intx, OnStackReplacePercentage,                                \
2235           "NON_TIERED number of method invocations/branches (expressed as " \
2236           "% of CompileThreshold) before (re-)compiling OSR code")          \
2237           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
2238                                                                             \
2239   product(intx, InterpreterProfilePercentage, 33,                           \
2240           "NON_TIERED number of method invocations/branches (expressed as " \
2241           "% of CompileThreshold) before profiling in the interpreter")     \
2242           range(0, 100)                                                     \
2243                                                                             \
2244   develop(intx, MaxRecompilationSearchLength,    10,                        \
2245           "The maximum number of frames to inspect when searching for "     \
2246           "recompilee")                                                     \
2247                                                                             \
2248   develop(intx, MaxInterpretedSearchLength,     3,                          \
2249           "The maximum number of interpreted frames to skip when searching "\
2250           "for recompilee")                                                 \
2251                                                                             \
2252   develop(intx, DesiredMethodLimit,  8000,                                  \
2253           "The desired maximum method size (in bytecodes) after inlining")  \
2254                                                                             \
2255   develop(intx, HugeMethodLimit,  8000,                                     \
2256           "Don't compile methods larger than this if "                      \
2257           "+DontCompileHugeMethods")                                        \
2258                                                                             \
2259   /* Properties for Java libraries  */                                      \
2260                                                                             \
2261   product(uint64_t, MaxDirectMemorySize, 0,                                 \
2262           "Maximum total size of NIO direct-buffer allocations")            \
2263           range(0, max_jlong)                                               \
2264                                                                             \
2265   /* Flags used for temporary code during development  */                   \
2266                                                                             \
2267   diagnostic(bool, UseNewCode, false,                                       \
2268           "Testing Only: Use the new version while testing")                \
2269                                                                             \
2270   diagnostic(bool, UseNewCode2, false,                                      \
2271           "Testing Only: Use the new version while testing")                \
2272                                                                             \
2273   diagnostic(bool, UseNewCode3, false,                                      \
2274           "Testing Only: Use the new version while testing")                \
2275                                                                             \
2276   /* flags for performance data collection */                               \
2277                                                                             \
2278   product(bool, UsePerfData, true,                                          \
2279           "Flag to disable jvmstat instrumentation for performance testing "\
2280           "and problem isolation purposes")                                 \
2281                                                                             \
2282   product(bool, PerfDataSaveToFile, false,                                  \
2283           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
2284                                                                             \
2285   product(ccstr, PerfDataSaveFile, NULL,                                    \
2286           "Save PerfData memory to the specified absolute pathname. "       \
2287           "The string %p in the file name (if present) "                    \
2288           "will be replaced by pid")                                        \
2289                                                                             \
2290   product(intx, PerfDataSamplingInterval, 50,                               \
2291           "Data sampling interval (in milliseconds)")                       \
2292           range(PeriodicTask::min_interval, max_jint)                       \
2293           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
2294                                                                             \
2295   product(bool, PerfDisableSharedMem, false,                                \
2296           "Store performance data in standard memory")                      \
2297                                                                             \
2298   product(intx, PerfDataMemorySize, 32*K,                                   \
2299           "Size of performance data memory region. Will be rounded "        \
2300           "up to a multiple of the native os page size.")                   \
2301           range(128, 32*64*K)                                               \
2302                                                                             \
2303   product(intx, PerfMaxStringConstLength, 1024,                             \
2304           "Maximum PerfStringConstant string length before truncation")     \
2305           range(32, 32*K)                                                   \
2306                                                                             \
2307   product(bool, PerfAllowAtExitRegistration, false,                         \
2308           "Allow registration of atexit() methods")                         \
2309                                                                             \
2310   product(bool, PerfBypassFileSystemCheck, false,                           \
2311           "Bypass Win32 file system criteria checks (Windows Only)")        \
2312                                                                             \
2313   product(intx, UnguardOnExecutionViolation, 0,                             \
2314           "Unguard page and retry on no-execute fault (Win32 only) "        \
2315           "0=off, 1=conservative, 2=aggressive")                            \
2316           range(0, 2)                                                       \
2317                                                                             \
2318   /* Serviceability Support */                                              \
2319                                                                             \
2320   product(bool, ManagementServer, false,                                    \
2321           "Create JMX Management Server")                                   \
2322                                                                             \
2323   product(bool, DisableAttachMechanism, false,                              \
2324           "Disable mechanism that allows tools to attach to this VM")       \
2325                                                                             \
2326   product(bool, StartAttachListener, false,                                 \
2327           "Always start Attach Listener at VM startup")                     \
2328                                                                             \
2329   product(bool, EnableDynamicAgentLoading, true,                            \
2330           "Allow tools to load agents with the attach mechanism")           \
2331                                                                             \
2332   manageable(bool, PrintConcurrentLocks, false,                             \
2333           "Print java.util.concurrent locks in thread dump")                \
2334                                                                             \
2335   /* Shared spaces */                                                       \
2336                                                                             \
2337   product(bool, UseSharedSpaces, true,                                      \
2338           "Use shared spaces for metadata")                                 \
2339                                                                             \
2340   product(bool, VerifySharedSpaces, false,                                  \
2341           "Verify shared spaces (false for default archive, true for "      \
2342           "archive specified by -XX:SharedArchiveFile)")                    \
2343                                                                             \
2344   product(bool, RequireSharedSpaces, false,                                 \
2345           "Require shared spaces for metadata")                             \
2346                                                                             \
2347   product(bool, DumpSharedSpaces, false,                                    \
2348           "Special mode: JVM reads a class list, loads classes, builds "    \
2349           "shared spaces, and dumps the shared spaces to a file to be "     \
2350           "used in future JVM runs")                                        \
2351                                                                             \
2352   product(bool, PrintSharedArchiveAndExit, false,                           \
2353           "Print shared archive file contents")                             \
2354                                                                             \
2355   product(bool, PrintSharedDictionary, false,                               \
2356           "If PrintSharedArchiveAndExit is true, also print the shared "    \
2357           "dictionary")                                                     \
2358                                                                             \
2359   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
2360           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
2361           "Address to allocate shared memory region for class data")        \
2362           range(0, SIZE_MAX)                                                \
2363                                                                             \
2364   product(ccstr, SharedArchiveConfigFile, NULL,                             \
2365           "Data to add to the CDS archive file")                            \
2366                                                                             \
2367   product(uintx, SharedSymbolTableBucketSize, 4,                            \
2368           "Average number of symbols per bucket in shared table")           \
2369           range(2, 246)                                                     \
2370                                                                             \
2371   diagnostic(bool, AllowArchivingWithJavaAgent, false,                      \
2372           "Allow Java agent to be run with CDS dumping")                    \
2373                                                                             \
2374   diagnostic(bool, PrintMethodHandleStubs, false,                           \
2375           "Print generated stub code for method handles")                   \
2376                                                                             \
2377   develop(bool, TraceMethodHandles, false,                                  \
2378           "trace internal method handle operations")                        \
2379                                                                             \
2380   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
2381           "perform extra checks when constructing method handles")          \
2382                                                                             \
2383   diagnostic(bool, ShowHiddenFrames, false,                                 \
2384           "show method handle implementation frames (usually hidden)")      \
2385                                                                             \
2386   experimental(bool, TrustFinalNonStaticFields, false,                      \
2387           "trust final non-static declarations for constant folding")       \
2388                                                                             \
2389   diagnostic(bool, FoldStableValues, true,                                  \
2390           "Optimize loads from stable fields (marked w/ @Stable)")          \
2391                                                                             \
2392   develop(bool, TraceInvokeDynamic, false,                                  \
2393           "trace internal invoke dynamic operations")                       \
2394                                                                             \
2395   diagnostic(int, UseBootstrapCallInfo, 1,                                  \
2396           "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2397           "resolved before the bootstrap method is called; 1: when a BSM "  \
2398           "that may accept a BootstrapCallInfo is detected, use that API "  \
2399           "to pass BSM arguments, which allows the BSM to delay their "     \
2400           "resolution; 2+: stress test the BCI API by calling more BSMs "   \
2401           "via that API, instead of with the eagerly-resolved array.")      \
2402                                                                             \
2403   diagnostic(bool, PauseAtStartup,      false,                              \
2404           "Causes the VM to pause at startup time and wait for the pause "  \
2405           "file to be removed (default: ./vm.paused.<pid>)")                \
2406                                                                             \
2407   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
2408           "The file to create and for whose removal to await when pausing " \
2409           "at startup. (default: ./vm.paused.<pid>)")                       \
2410                                                                             \
2411   diagnostic(bool, PauseAtExit, false,                                      \
2412           "Pause and wait for keypress on exit if a debugger is attached")  \
2413                                                                             \
2414   product(bool, ExtendedDTraceProbes,    false,                             \
2415           "Enable performance-impacting dtrace probes")                     \
2416                                                                             \
2417   product(bool, DTraceMethodProbes, false,                                  \
2418           "Enable dtrace probes for method-entry and method-exit")          \
2419                                                                             \
2420   product(bool, DTraceAllocProbes, false,                                   \
2421           "Enable dtrace probes for object allocation")                     \
2422                                                                             \
2423   product(bool, DTraceMonitorProbes, false,                                 \
2424           "Enable dtrace probes for monitor events")                        \
2425                                                                             \
2426   product(bool, RelaxAccessControlCheck, false,                             \
2427           "Relax the access control checks in the verifier")                \
2428                                                                             \
2429   product(uintx, StringTableSize, defaultStringTableSize,                   \
2430           "Number of buckets in the interned String table "                 \
2431           "(will be rounded to nearest higher power of 2)")                 \
2432           range(minimumStringTableSize, 16777216ul)                         \
2433                                                                             \
2434   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
2435           "Number of buckets in the JVM internal Symbol table")             \
2436           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
2437                                                                             \
2438   product(bool, UseStringDeduplication, false,                              \
2439           "Use string deduplication")                                       \
2440                                                                             \
2441   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
2442           "A string must reach this age (or be promoted to an old region) " \
2443           "to be considered for deduplication")                             \
2444           range(1, markOopDesc::max_age)                                    \
2445                                                                             \
2446   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
2447           "Force table resize every time the table is scanned")             \
2448                                                                             \
2449   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
2450           "Force table rehash every time the table is scanned")             \
2451                                                                             \
2452   diagnostic(bool, WhiteBoxAPI, false,                                      \
2453           "Enable internal testing APIs")                                   \
2454                                                                             \
2455   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
2456            "Default survivor space alignment in bytes")                     \
2457            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
2458                                                                             \
2459   product(ccstr, DumpLoadedClassList, NULL,                                 \
2460           "Dump the names all loaded classes, that could be stored into "   \
2461           "the CDS archive, in the specified file")                         \
2462                                                                             \
2463   product(ccstr, SharedClassListFile, NULL,                                 \
2464           "Override the default CDS class list")                            \
2465                                                                             \
2466   product(ccstr, SharedArchiveFile, NULL,                                   \
2467           "Override the default location of the CDS archive file")          \
2468                                                                             \
2469   product(ccstr, ExtraSharedClassListFile, NULL,                            \
2470           "Extra classlist for building the CDS archive file")              \
2471                                                                             \
2472   experimental(size_t, ArrayAllocatorMallocLimit,                           \
2473           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
2474           "Allocation less than this value will be allocated "              \
2475           "using malloc. Larger allocations will use mmap.")                \
2476                                                                             \
2477   experimental(bool, AlwaysAtomicAccesses, false,                           \
2478           "Accesses to all variables should always be atomic")              \
2479                                                                             \
2480   diagnostic(bool, UseUnalignedAccesses, false,                             \
2481           "Use unaligned memory accesses in Unsafe")                        \
2482                                                                             \
2483   product_pd(bool, PreserveFramePointer,                                    \
2484              "Use the FP register for holding the frame pointer "           \
2485              "and not as a general purpose register.")                      \
2486                                                                             \
2487   diagnostic(bool, CheckIntrinsics, true,                                   \
2488              "When a class C is loaded, check that "                        \
2489              "(1) all intrinsics defined by the VM for class C are present "\
2490              "in the loaded class file and are marked with the "            \
2491              "@HotSpotIntrinsicCandidate annotation, that "                 \
2492              "(2) there is an intrinsic registered for all loaded methods " \
2493              "that are annotated with the @HotSpotIntrinsicCandidate "      \
2494              "annotation, and that "                                        \
2495              "(3) no orphan methods exist for class C (i.e., methods for "  \
2496              "which the VM declares an intrinsic but that are not declared "\
2497              "in the loaded class C. "                                      \
2498              "Check (3) is available only in debug builds.")                \
2499                                                                             \
2500   diagnostic_pd(intx, InitArrayShortSize,                                   \
2501           "Threshold small size (in bytes) for clearing arrays. "           \
2502           "Anything this size or smaller may get converted to discrete "    \
2503           "scalar stores.")                                                 \
2504           range(0, max_intx)                                                \
2505           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
2506                                                                             \
2507   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
2508              "Disable backwards compatibility for compile commands.")       \
2509                                                                             \
2510   diagnostic(bool, CompilerDirectivesPrint, false,                          \
2511              "Print compiler directives on installation.")                  \
2512   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
2513              "Limit on number of compiler directives.")                     \
2514                                                                             \
2515   product(ccstr, AllocateHeapAt, NULL,                                      \
2516           "Path to the directoy where a temporary file will be created "    \
2517           "to use as the backing store for Java Heap.")                     \
2518                                                                             \
2519   experimental(ccstr, AllocateOldGenAt, NULL,                               \
2520           "Path to the directoy where a temporary file will be "            \
2521           "created to use as the backing store for old generation."         \
2522           "File of size Xmx is pre-allocated for performance reason, so"    \
2523           "we need that much space available")                              \
2524                                                                             \
2525   develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0),       \
2526                "Run periodic metaspace verifications (0 - none, "           \
2527                "1 - always, >1 every nth interval)")                        \
2528                                                                             \
2529   diagnostic(bool, ShowRegistersOnAssert, true,                             \
2530           "On internal errors, include registers in error report.")         \
2531                                                                             \
2532   experimental(bool, UseSwitchProfiling, true,                              \
2533           "leverage profiling for table/lookup switch")                     \
2534                                                                             \
2535   JFR_ONLY(product(bool, FlightRecorder, false,                             \
2536           "Enable Flight Recorder"))                                        \
2537                                                                             \
2538   JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL,                      \
2539           "Flight Recorder options"))                                       \
2540                                                                             \
2541   JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
2542           "Start flight recording with options"))                           \
2543                                                                             \
2544   experimental(bool, UseFastUnorderedTimeStamps, false,                     \
2545           "Use platform unstable time where supported for timestamps only")
2546 
2547 #define VM_FLAGS(develop,                                                   \
2548                  develop_pd,                                                \
2549                  product,                                                   \
2550                  product_pd,                                                \
2551                  diagnostic,                                                \
2552                  diagnostic_pd,                                             \
2553                  experimental,                                              \
2554                  notproduct,                                                \
2555                  manageable,                                                \
2556                  product_rw,                                                \
2557                  lp64_product,                                              \
2558                  range,                                                     \
2559                  constraint,                                                \
2560                  writeable)                                                 \
2561                                                                             \
2562   RUNTIME_FLAGS(                                                            \
2563     develop,                                                                \
2564     develop_pd,                                                             \
2565     product,                                                                \
2566     product_pd,                                                             \
2567     diagnostic,                                                             \
2568     diagnostic_pd,                                                          \
2569     experimental,                                                           \
2570     notproduct,                                                             \
2571     manageable,                                                             \
2572     product_rw,                                                             \
2573     lp64_product,                                                           \
2574     range,                                                                  \
2575     constraint,                                                             \
2576     writeable)                                                              \
2577                                                                             \
2578   GC_FLAGS(                                                                 \
2579     develop,                                                                \
2580     develop_pd,                                                             \
2581     product,                                                                \
2582     product_pd,                                                             \
2583     diagnostic,                                                             \
2584     diagnostic_pd,                                                          \
2585     experimental,                                                           \
2586     notproduct,                                                             \
2587     manageable,                                                             \
2588     product_rw,                                                             \
2589     lp64_product,                                                           \
2590     range,                                                                  \
2591     constraint,                                                             \
2592     writeable)                                                              \
2593 
2594 /*
2595  *  Macros for factoring of globals
2596  */
2597 
2598 // Interface macros
2599 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
2600 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
2601 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
2602 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
2603 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
2604 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
2605 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
2606 #ifdef PRODUCT
2607 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
2608 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
2609 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
2610 #else
2611 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
2612 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
2613 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
2614 #endif // PRODUCT
2615 // Special LP64 flags, product only needed for now.
2616 #ifdef _LP64
2617 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2618 #else
2619 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
2620 #endif // _LP64
2621 
2622 // Implementation macros
2623 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
2624 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
2625 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
2626 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
2627 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
2628 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
2629 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
2630 #ifdef PRODUCT
2631 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
2632 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
2633 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
2634 #else
2635 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
2636 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
2637 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
2638 #endif // PRODUCT
2639 #ifdef _LP64
2640 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
2641 #else
2642 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
2643 #endif // _LP64
2644 
2645 // Only materialize src code for range checking when required, ignore otherwise
2646 #define IGNORE_RANGE(a, b)
2647 // Only materialize src code for contraint checking when required, ignore otherwise
2648 #define IGNORE_CONSTRAINT(func,type)
2649 
2650 #define IGNORE_WRITEABLE(type)
2651 
2652 VM_FLAGS(DECLARE_DEVELOPER_FLAG, \
2653          DECLARE_PD_DEVELOPER_FLAG, \
2654          DECLARE_PRODUCT_FLAG, \
2655          DECLARE_PD_PRODUCT_FLAG, \
2656          DECLARE_DIAGNOSTIC_FLAG, \
2657          DECLARE_PD_DIAGNOSTIC_FLAG, \
2658          DECLARE_EXPERIMENTAL_FLAG, \
2659          DECLARE_NOTPRODUCT_FLAG, \
2660          DECLARE_MANAGEABLE_FLAG, \
2661          DECLARE_PRODUCT_RW_FLAG, \
2662          DECLARE_LP64_PRODUCT_FLAG, \
2663          IGNORE_RANGE, \
2664          IGNORE_CONSTRAINT, \
2665          IGNORE_WRITEABLE)
2666 
2667 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
2668                  DECLARE_PD_DEVELOPER_FLAG, \
2669                  DECLARE_PRODUCT_FLAG, \
2670                  DECLARE_PD_PRODUCT_FLAG, \
2671                  DECLARE_DIAGNOSTIC_FLAG, \
2672                  DECLARE_PD_DIAGNOSTIC_FLAG, \
2673                  DECLARE_NOTPRODUCT_FLAG, \
2674                  IGNORE_RANGE, \
2675                  IGNORE_CONSTRAINT, \
2676                  IGNORE_WRITEABLE)
2677 
2678 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
2679            DECLARE_PRODUCT_FLAG, \
2680            DECLARE_DIAGNOSTIC_FLAG, \
2681            DECLARE_EXPERIMENTAL_FLAG, \
2682            DECLARE_NOTPRODUCT_FLAG, \
2683            IGNORE_RANGE, \
2684            IGNORE_CONSTRAINT, \
2685            IGNORE_WRITEABLE)
2686 
2687 // Extensions
2688 
2689 #include "runtime/globals_ext.hpp"
2690 
2691 #endif // SHARE_RUNTIME_GLOBALS_HPP