rev 54612 : Checkpoint latest preliminary review patches for full OpenJDK review; merge with 8222295.patch.

   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   diagnostic(bool, SafepointALot, false,                                    \
 371           "Generate a lot of safepoints. This works with "                  \
 372           "GuaranteedSafepointInterval")                                    \
 373                                                                             \
 374   diagnostic(bool, HandshakeALot, false,                                    \
 375           "Generate a lot of handshakes. This works with "                  \
 376           "GuaranteedSafepointInterval")                                    \
 377                                                                             \
 378   product_pd(bool, BackgroundCompilation,                                   \
 379           "A thread requesting compilation is not blocked during "          \
 380           "compilation")                                                    \
 381                                                                             \
 382   product(bool, PrintVMQWaitTime, false,                                    \
 383           "Print out the waiting time in VM operation queue")               \
 384                                                                             \
 385   product(bool, MethodFlushing, true,                                       \
 386           "Reclamation of zombie and not-entrant methods")                  \
 387                                                                             \
 388   develop(bool, VerifyStack, false,                                         \
 389           "Verify stack of each thread when it is entering a runtime call") \
 390                                                                             \
 391   diagnostic(bool, ForceUnreachable, false,                                 \
 392           "Make all non code cache addresses to be unreachable by "         \
 393           "forcing use of 64bit literal fixups")                            \
 394                                                                             \
 395   notproduct(bool, StressDerivedPointers, false,                            \
 396           "Force scavenge when a derived pointer is detected on stack "     \
 397           "after rtm call")                                                 \
 398                                                                             \
 399   develop(bool, TraceDerivedPointers, false,                                \
 400           "Trace traversal of derived pointers on stack")                   \
 401                                                                             \
 402   notproduct(bool, TraceCodeBlobStacks, false,                              \
 403           "Trace stack-walk of codeblobs")                                  \
 404                                                                             \
 405   product(bool, PrintJNIResolving, false,                                   \
 406           "Used to implement -v:jni")                                       \
 407                                                                             \
 408   notproduct(bool, PrintRewrites, false,                                    \
 409           "Print methods that are being rewritten")                         \
 410                                                                             \
 411   product(bool, UseInlineCaches, true,                                      \
 412           "Use Inline Caches for virtual calls ")                           \
 413                                                                             \
 414   diagnostic(bool, InlineArrayCopy, true,                                   \
 415           "Inline arraycopy native that is known to be part of "            \
 416           "base library DLL")                                               \
 417                                                                             \
 418   diagnostic(bool, InlineObjectHash, true,                                  \
 419           "Inline Object::hashCode() native that is known to be part "      \
 420           "of base library DLL")                                            \
 421                                                                             \
 422   diagnostic(bool, InlineNatives, true,                                     \
 423           "Inline natives that are known to be part of base library DLL")   \
 424                                                                             \
 425   diagnostic(bool, InlineMathNatives, true,                                 \
 426           "Inline SinD, CosD, etc.")                                        \
 427                                                                             \
 428   diagnostic(bool, InlineClassNatives, true,                                \
 429           "Inline Class.isInstance, etc")                                   \
 430                                                                             \
 431   diagnostic(bool, InlineThreadNatives, true,                               \
 432           "Inline Thread.currentThread, etc")                               \
 433                                                                             \
 434   diagnostic(bool, InlineUnsafeOps, true,                                   \
 435           "Inline memory ops (native methods) from Unsafe")                 \
 436                                                                             \
 437   product(bool, CriticalJNINatives, true,                                   \
 438           "Check for critical JNI entry points")                            \
 439                                                                             \
 440   notproduct(bool, StressCriticalJNINatives, false,                         \
 441           "Exercise register saving code in critical natives")              \
 442                                                                             \
 443   diagnostic(bool, UseAESIntrinsics, false,                                 \
 444           "Use intrinsics for AES versions of crypto")                      \
 445                                                                             \
 446   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 447           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 448                                                                             \
 449   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 450           "Use intrinsics for SHA-1 crypto hash function. "                 \
 451           "Requires that UseSHA is enabled.")                               \
 452                                                                             \
 453   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 454           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 455           "Requires that UseSHA is enabled.")                               \
 456                                                                             \
 457   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 458           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 459           "Requires that UseSHA is enabled.")                               \
 460                                                                             \
 461   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 462           "use intrinsics for java.util.zip.CRC32")                         \
 463                                                                             \
 464   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 465           "use intrinsics for java.util.zip.CRC32C")                        \
 466                                                                             \
 467   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 468           "use intrinsics for java.util.zip.Adler32")                       \
 469                                                                             \
 470   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 471           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 472                                                                             \
 473   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 474          "do not expand intrinsics whose (internal) names appear here")     \
 475                                                                             \
 476   develop(bool, TraceCallFixup, false,                                      \
 477           "Trace all call fixups")                                          \
 478                                                                             \
 479   develop(bool, DeoptimizeALot, false,                                      \
 480           "Deoptimize at every exit from the runtime system")               \
 481                                                                             \
 482   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 483           "A comma separated list of bcis to deoptimize at")                \
 484                                                                             \
 485   product(bool, DeoptimizeRandom, false,                                    \
 486           "Deoptimize random frames on random exit from the runtime system")\
 487                                                                             \
 488   notproduct(bool, ZombieALot, false,                                       \
 489           "Create zombies (non-entrant) at exit from the runtime system")   \
 490                                                                             \
 491   notproduct(bool, WalkStackALot, false,                                    \
 492           "Trace stack (no print) at every exit from the runtime system")   \
 493                                                                             \
 494   product(bool, Debugging, false,                                           \
 495           "Set when executing debug methods in debug.cpp "                  \
 496           "(to prevent triggering assertions)")                             \
 497                                                                             \
 498   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 499           "Enable strict checks that safepoints cannot happen for threads " \
 500           "that use NoSafepointVerifier")                                   \
 501                                                                             \
 502   notproduct(bool, VerifyLastFrame, false,                                  \
 503           "Verify oops on last frame on entry to VM")                       \
 504                                                                             \
 505   product(bool, FailOverToOldVerifier, true,                                \
 506           "Fail over to old verifier when split verifier fails")            \
 507                                                                             \
 508   product(bool, SafepointTimeout, false,                                    \
 509           "Time out and warn or fail after SafepointTimeoutDelay "          \
 510           "milliseconds if failed to reach safepoint")                      \
 511                                                                             \
 512   diagnostic(bool, AbortVMOnSafepointTimeout, false,                        \
 513           "Abort upon failure to reach safepoint (see SafepointTimeout)")   \
 514                                                                             \
 515   diagnostic(bool, AbortVMOnVMOperationTimeout, false,                      \
 516           "Abort upon failure to complete VM operation promptly")           \
 517                                                                             \
 518   diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000,                  \
 519           "Delay in milliseconds for option AbortVMOnVMOperationTimeout")   \
 520           range(0, max_intx)                                                \
 521                                                                             \
 522   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 523   /* typically, at most a few retries are needed                    */      \
 524   product(intx, SuspendRetryCount, 50,                                      \
 525           "Maximum retry count for an external suspend request")            \
 526           range(0, max_intx)                                                \
 527                                                                             \
 528   product(intx, SuspendRetryDelay, 5,                                       \
 529           "Milliseconds to delay per retry (* current_retry_count)")        \
 530           range(0, max_intx)                                                \
 531                                                                             \
 532   product(bool, AssertOnSuspendWaitFailure, false,                          \
 533           "Assert/Guarantee on external suspend wait failure")              \
 534                                                                             \
 535   product(bool, TraceSuspendWaitFailures, false,                            \
 536           "Trace external suspend wait failures")                           \
 537                                                                             \
 538   product(bool, MaxFDLimit, true,                                           \
 539           "Bump the number of file descriptors to maximum in Solaris")      \
 540                                                                             \
 541   diagnostic(bool, LogEvents, true,                                         \
 542           "Enable the various ring buffer event logs")                      \
 543                                                                             \
 544   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 545           "Number of ring buffer event logs")                               \
 546           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 547                                                                             \
 548   diagnostic(bool, BytecodeVerificationRemote, true,                        \
 549           "Enable the Java bytecode verifier for remote classes")           \
 550                                                                             \
 551   diagnostic(bool, BytecodeVerificationLocal, false,                        \
 552           "Enable the Java bytecode verifier for local classes")            \
 553                                                                             \
 554   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 555           "Force exceptions on FP stack under/overflow")                    \
 556                                                                             \
 557   develop(bool, VerifyStackAtCalls, false,                                  \
 558           "Verify that the stack pointer is unchanged after calls")         \
 559                                                                             \
 560   develop(bool, TraceJavaAssertions, false,                                 \
 561           "Trace java language assertions")                                 \
 562                                                                             \
 563   notproduct(bool, VerifyCodeCache, false,                                  \
 564           "Verify code cache on memory allocation/deallocation")            \
 565                                                                             \
 566   develop(bool, UseMallocOnly, false,                                       \
 567           "Use only malloc/free for allocation (no resource area/arena)")   \
 568                                                                             \
 569   develop(bool, PrintMallocStatistics, false,                               \
 570           "Print malloc/free statistics")                                   \
 571                                                                             \
 572   develop(bool, ZapResourceArea, trueInDebug,                               \
 573           "Zap freed resource/arena space with 0xABABABAB")                 \
 574                                                                             \
 575   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 576           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 577                                                                             \
 578   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 579           "Zap allocated/freed stack segments with 0xFADFADED")             \
 580                                                                             \
 581   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 582           "Zap unused heap space with 0xBAADBABE")                          \
 583                                                                             \
 584   develop(bool, CheckZapUnusedHeapArea, false,                              \
 585           "Check zapping of unused heap space")                             \
 586                                                                             \
 587   develop(bool, ZapFillerObjects, trueInDebug,                              \
 588           "Zap filler objects with 0xDEAFBABE")                             \
 589                                                                             \
 590   develop(bool, PrintVMMessages, true,                                      \
 591           "Print VM messages on console")                                   \
 592                                                                             \
 593   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 594           "If > 0, provokes an error after VM initialization; the value "   \
 595           "determines which error to provoke. See test_error_handler() "    \
 596           "in vmError.cpp.")                                                \
 597                                                                             \
 598   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 599           "If > 0, provokes an error inside VM error handler (a secondary " \
 600           "crash). see test_error_handler() in vmError.cpp")                \
 601                                                                             \
 602   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 603           "If true, tests SafeFetch inside error handler.")                 \
 604                                                                             \
 605   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 606           "If true, simulates an unresponsive error handler.")              \
 607                                                                             \
 608   develop(bool, Verbose, false,                                             \
 609           "Print additional debugging information from other modes")        \
 610                                                                             \
 611   develop(bool, PrintMiscellaneous, false,                                  \
 612           "Print uncategorized debugging information (requires +Verbose)")  \
 613                                                                             \
 614   develop(bool, WizardMode, false,                                          \
 615           "Print much more debugging information")                          \
 616                                                                             \
 617   product(bool, ShowMessageBoxOnError, false,                               \
 618           "Keep process alive on VM fatal error")                           \
 619                                                                             \
 620   product(bool, CreateCoredumpOnCrash, true,                                \
 621           "Create core/mini dump on VM fatal error")                        \
 622                                                                             \
 623   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 624           "Timeout, in seconds, to limit the time spent on writing an "     \
 625           "error log in case of a crash.")                                  \
 626           range(0, (uint64_t)max_jlong/1000)                                \
 627                                                                             \
 628   product_pd(bool, UseOSErrorReporting,                                     \
 629           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 630                                                                             \
 631   product(bool, SuppressFatalErrorMessage, false,                           \
 632           "Report NO fatal error message (avoid deadlock)")                 \
 633                                                                             \
 634   product(ccstrlist, OnError, "",                                           \
 635           "Run user-defined commands on fatal error; see VMError.cpp "      \
 636           "for examples")                                                   \
 637                                                                             \
 638   product(ccstrlist, OnOutOfMemoryError, "",                                \
 639           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 640                                                                             \
 641   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 642           "Dump heap to file before any major stop-the-world GC")           \
 643                                                                             \
 644   manageable(bool, HeapDumpAfterFullGC, false,                              \
 645           "Dump heap to file after any major stop-the-world GC")            \
 646                                                                             \
 647   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 648           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 649                                                                             \
 650   manageable(ccstr, HeapDumpPath, NULL,                                     \
 651           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 652           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 653           "in the working directory)")                                      \
 654                                                                             \
 655   develop(bool, BreakAtWarning, false,                                      \
 656           "Execute breakpoint upon encountering VM warning")                \
 657                                                                             \
 658   product(ccstr, NativeMemoryTracking, "off",                               \
 659           "Native memory tracking options")                                 \
 660                                                                             \
 661   diagnostic(bool, PrintNMTStatistics, false,                               \
 662           "Print native memory tracking summary data if it is on")          \
 663                                                                             \
 664   diagnostic(bool, LogCompilation, false,                                   \
 665           "Log compilation activity in detail to LogFile")                  \
 666                                                                             \
 667   product(bool, PrintCompilation, false,                                    \
 668           "Print compilations")                                             \
 669                                                                             \
 670   product(bool, PrintExtendedThreadInfo, false,                             \
 671           "Print more information in thread dump")                          \
 672                                                                             \
 673   diagnostic(bool, TraceNMethodInstalls, false,                             \
 674           "Trace nmethod installation")                                     \
 675                                                                             \
 676   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 677           "0: do not allow scavengable oops in the code cache; "            \
 678           "1: allow scavenging from the code cache; "                       \
 679           "2: emit as many constants as the compiler can see")              \
 680           range(0, 2)                                                       \
 681                                                                             \
 682   product(bool, AlwaysRestoreFPU, false,                                    \
 683           "Restore the FPU control word after every JNI call (expensive)")  \
 684                                                                             \
 685   diagnostic(bool, PrintCompilation2, false,                                \
 686           "Print additional statistics per compilation")                    \
 687                                                                             \
 688   diagnostic(bool, PrintAdapterHandlers, false,                             \
 689           "Print code generated for i2c/c2i adapters")                      \
 690                                                                             \
 691   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 692           "Verify that i2c/c2i adapters are called properly")               \
 693                                                                             \
 694   develop(bool, VerifyAdapterSharing, false,                                \
 695           "Verify that the code for shared adapters is the equivalent")     \
 696                                                                             \
 697   diagnostic(bool, PrintAssembly, false,                                    \
 698           "Print assembly code (using external disassembler.so)")           \
 699                                                                             \
 700   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 701           "Print options string passed to disassembler.so")                 \
 702                                                                             \
 703   notproduct(bool, PrintNMethodStatistics, false,                           \
 704           "Print a summary statistic for the generated nmethods")           \
 705                                                                             \
 706   diagnostic(bool, PrintNMethods, false,                                    \
 707           "Print assembly code for nmethods when generated")                \
 708                                                                             \
 709   diagnostic(bool, PrintNativeNMethods, false,                              \
 710           "Print assembly code for native nmethods when generated")         \
 711                                                                             \
 712   develop(bool, PrintDebugInfo, false,                                      \
 713           "Print debug information for all nmethods when generated")        \
 714                                                                             \
 715   develop(bool, PrintRelocations, false,                                    \
 716           "Print relocation information for all nmethods when generated")   \
 717                                                                             \
 718   develop(bool, PrintDependencies, false,                                   \
 719           "Print dependency information for all nmethods when generated")   \
 720                                                                             \
 721   develop(bool, PrintExceptionHandlers, false,                              \
 722           "Print exception handler tables for all nmethods when generated") \
 723                                                                             \
 724   develop(bool, StressCompiledExceptionHandlers, false,                     \
 725           "Exercise compiled exception handlers")                           \
 726                                                                             \
 727   develop(bool, InterceptOSException, false,                                \
 728           "Start debugger when an implicit OS (e.g. NULL) "                 \
 729           "exception happens")                                              \
 730                                                                             \
 731   product(bool, PrintCodeCache, false,                                      \
 732           "Print the code cache memory usage when exiting")                 \
 733                                                                             \
 734   develop(bool, PrintCodeCache2, false,                                     \
 735           "Print detailed usage information on the code cache when exiting")\
 736                                                                             \
 737   product(bool, PrintCodeCacheOnCompilation, false,                         \
 738           "Print the code cache memory usage each time a method is "        \
 739           "compiled")                                                       \
 740                                                                             \
 741   diagnostic(bool, PrintCodeHeapAnalytics, false,                           \
 742           "Print code heap usage statistics on exit and on full condition") \
 743                                                                             \
 744   diagnostic(bool, PrintStubCode, false,                                    \
 745           "Print generated stub code")                                      \
 746                                                                             \
 747   product(bool, StackTraceInThrowable, true,                                \
 748           "Collect backtrace in throwable when exception happens")          \
 749                                                                             \
 750   product(bool, OmitStackTraceInFastThrow, true,                            \
 751           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 752                                                                             \
 753   product(bool, PrintWarnings, true,                                        \
 754           "Print JVM warnings to output stream")                            \
 755                                                                             \
 756   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 757           "Print warnings for stalled SpinLocks")                           \
 758                                                                             \
 759   product(bool, RegisterFinalizersAtInit, true,                             \
 760           "Register finalizable objects at end of Object.<init> or "        \
 761           "after allocation")                                               \
 762                                                                             \
 763   develop(bool, RegisterReferences, true,                                   \
 764           "Tell whether the VM should register soft/weak/final/phantom "    \
 765           "references")                                                     \
 766                                                                             \
 767   develop(bool, IgnoreRewrites, false,                                      \
 768           "Suppress rewrites of bytecodes in the oopmap generator. "        \
 769           "This is unsafe!")                                                \
 770                                                                             \
 771   develop(bool, PrintCodeCacheExtension, false,                             \
 772           "Print extension of code cache")                                  \
 773                                                                             \
 774   develop(bool, UsePrivilegedStack, true,                                   \
 775           "Enable the security JVM functions")                              \
 776                                                                             \
 777   develop(bool, ProtectionDomainVerification, true,                         \
 778           "Verify protection domain before resolution in system dictionary")\
 779                                                                             \
 780   product(bool, ClassUnloading, true,                                       \
 781           "Do unloading of classes")                                        \
 782                                                                             \
 783   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
 784           "Do unloading of classes with a concurrent marking cycle")        \
 785                                                                             \
 786   develop(bool, DisableStartThread, false,                                  \
 787           "Disable starting of additional Java threads "                    \
 788           "(for debugging only)")                                           \
 789                                                                             \
 790   develop(bool, MemProfiling, false,                                        \
 791           "Write memory usage profiling to log file")                       \
 792                                                                             \
 793   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 794           "Print the system dictionary at exit")                            \
 795                                                                             \
 796   diagnostic(bool, DynamicallyResizeSystemDictionaries, true,               \
 797           "Dynamically resize system dictionaries as needed")               \
 798                                                                             \
 799   product(bool, AlwaysLockClassLoader, false,                               \
 800           "Require the VM to acquire the class loader lock before calling " \
 801           "loadClass() even for class loaders registering "                 \
 802           "as parallel capable")                                            \
 803                                                                             \
 804   product(bool, AllowParallelDefineClass, false,                            \
 805           "Allow parallel defineClass requests for class loaders "          \
 806           "registering as parallel capable")                                \
 807                                                                             \
 808   product_pd(bool, DontYieldALot,                                           \
 809           "Throw away obvious excess yield calls")                          \
 810                                                                             \
 811   develop(bool, UseDetachedThreads, true,                                   \
 812           "Use detached threads that are recycled upon termination "        \
 813           "(for Solaris only)")                                             \
 814                                                                             \
 815   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
 816                "Disable the use of stack guard pages if the JVM is loaded " \
 817                "on the primordial process thread")                          \
 818                                                                             \
 819   product(bool, UseLWPSynchronization, true,                                \
 820           "Use LWP-based instead of libthread-based synchronization "       \
 821           "(SPARC only)")                                                   \
 822                                                                             \
 823   product(intx, MonitorBound, 0, "Bound Monitor population")                \
 824           range(0, max_jint)                                                \
 825                                                                             \



 826   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
 827                 "Percentage of used monitors before triggering cleanup "    \
 828                 "safepoint which deflates monitors (0 is off). "            \
 829                 "The check is performed on GuaranteedSafepointInterval.")   \
 830                 range(0, 100)                                               \
 831                                                                             \
 832   experimental(intx, hashCode, 5,                                           \
 833                "(Unstable) select hashCode generation algorithm")           \
 834                                                                             \
 835   product(bool, FilterSpuriousWakeups, true,                                \
 836           "When true prevents OS-level spurious, or premature, wakeups "    \
 837           "from Object.wait (Ignored for Windows)")                         \
 838                                                                             \
 839   develop(bool, UsePthreads, false,                                         \
 840           "Use pthread-based instead of libthread-based synchronization "   \
 841           "(SPARC only)")                                                   \
 842                                                                             \
 843   product(bool, ReduceSignalUsage, false,                                   \
 844           "Reduce the use of OS signals in Java and/or the VM")             \
 845                                                                             \
 846   develop_pd(bool, ShareVtableStubs,                                        \
 847           "Share vtable stubs (smaller code but worse branch prediction")   \
 848                                                                             \
 849   develop(bool, LoadLineNumberTables, true,                                 \
 850           "Tell whether the class file parser loads line number tables")    \
 851                                                                             \
 852   develop(bool, LoadLocalVariableTables, true,                              \
 853           "Tell whether the class file parser loads local variable tables") \
 854                                                                             \
 855   develop(bool, LoadLocalVariableTypeTables, true,                          \
 856           "Tell whether the class file parser loads local variable type"    \
 857           "tables")                                                         \
 858                                                                             \
 859   product(bool, AllowUserSignalHandlers, false,                             \
 860           "Do not complain if the application installs signal handlers "    \
 861           "(Solaris & Linux only)")                                         \
 862                                                                             \
 863   product(bool, UseSignalChaining, true,                                    \
 864           "Use signal-chaining to invoke signal handlers installed "        \
 865           "by the application (Solaris & Linux only)")                      \
 866                                                                             \
 867   product(bool, AllowJNIEnvProxy, false,                                    \
 868           "(Deprecated) Allow JNIEnv proxies for jdbx")                     \
 869                                                                             \
 870   product(bool, RestoreMXCSROnJNICalls, false,                              \
 871           "Restore MXCSR when returning from JNI calls")                    \
 872                                                                             \
 873   product(bool, CheckJNICalls, false,                                       \
 874           "Verify all arguments to JNI calls")                              \
 875                                                                             \
 876   product(bool, UseFastJNIAccessors, true,                                  \
 877           "Use optimized versions of Get<Primitive>Field")                  \
 878                                                                             \
 879   product(intx, MaxJNILocalCapacity, 65536,                                 \
 880           "Maximum allowable local JNI handle capacity to "                 \
 881           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
 882           "where <= 0 is unlimited, default: 65536")                        \
 883           range(min_intx, max_intx)                                         \
 884                                                                             \
 885   product(bool, EagerXrunInit, false,                                       \
 886           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 887           "but not all -Xrun libraries may support the state of the VM "    \
 888           "at this time")                                                   \
 889                                                                             \
 890   product(bool, PreserveAllAnnotations, false,                              \
 891           "Preserve RuntimeInvisibleAnnotations as well "                   \
 892           "as RuntimeVisibleAnnotations")                                   \
 893                                                                             \
 894   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 895           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 896                                                                             \
 897   product(bool, UseXMMForArrayCopy, false,                                  \
 898           "Use SSE2 MOVQ instruction for Arraycopy")                        \
 899                                                                             \
 900   product(intx, FieldsAllocationStyle, 1,                                   \
 901           "0 - type based with oops first, "                                \
 902           "1 - with oops last, "                                            \
 903           "2 - oops in super and sub classes are together")                 \
 904           range(0, 2)                                                       \
 905                                                                             \
 906   product(bool, CompactFields, true,                                        \
 907           "Allocate nonstatic fields in gaps between previous fields")      \
 908                                                                             \
 909   notproduct(bool, PrintFieldLayout, false,                                 \
 910           "Print field layout for each class")                              \
 911                                                                             \
 912   /* Need to limit the extent of the padding to reasonable size.          */\
 913   /* 8K is well beyond the reasonable HW cache line size, even with       */\
 914   /* aggressive prefetching, while still leaving the room for segregating */\
 915   /* among the distinct pages.                                            */\
 916   product(intx, ContendedPaddingWidth, 128,                                 \
 917           "How many bytes to pad the fields/classes marked @Contended with")\
 918           range(0, 8192)                                                    \
 919           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
 920                                                                             \
 921   product(bool, EnableContended, true,                                      \
 922           "Enable @Contended annotation support")                           \
 923                                                                             \
 924   product(bool, RestrictContended, true,                                    \
 925           "Restrict @Contended to trusted classes")                         \
 926                                                                             \
 927   product(bool, UseBiasedLocking, true,                                     \
 928           "Enable biased locking in JVM")                                   \
 929                                                                             \
 930   product(intx, BiasedLockingStartupDelay, 0,                               \
 931           "Number of milliseconds to wait before enabling biased locking")  \
 932           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
 933           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
 934                                                                             \
 935   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
 936           "Print statistics of biased locking in JVM")                      \
 937                                                                             \
 938   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
 939           "Threshold of number of revocations per type to try to "          \
 940           "rebias all objects in the heap of that type")                    \
 941           range(0, max_intx)                                                \
 942           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
 943                                                                             \
 944   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
 945           "Threshold of number of revocations per type to permanently "     \
 946           "revoke biases of all objects in the heap of that type")          \
 947           range(0, max_intx)                                                \
 948           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
 949                                                                             \
 950   product(intx, BiasedLockingDecayTime, 25000,                              \
 951           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
 952           "type after previous bulk rebias")                                \
 953           range(500, max_intx)                                              \
 954           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
 955                                                                             \
 956   product(bool, ExitOnOutOfMemoryError, false,                              \
 957           "JVM exits on the first occurrence of an out-of-memory error")    \
 958                                                                             \
 959   product(bool, CrashOnOutOfMemoryError, false,                             \
 960           "JVM aborts, producing an error log and core/mini dump, on the "  \
 961           "first occurrence of an out-of-memory error")                     \
 962                                                                             \
 963   /* tracing */                                                             \
 964                                                                             \
 965   develop(bool, StressRewriter, false,                                      \
 966           "Stress linktime bytecode rewriting")                             \
 967                                                                             \
 968   product(ccstr, TraceJVMTI, NULL,                                          \
 969           "Trace flags for JVMTI functions and events")                     \
 970                                                                             \
 971   /* This option can change an EMCP method into an obsolete method. */      \
 972   /* This can affect tests that except specific methods to be EMCP. */      \
 973   /* This option should be used with caution.                       */      \
 974   product(bool, StressLdcRewrite, false,                                    \
 975           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
 976                                                                             \
 977   /* change to false by default sometime after Mustang */                   \
 978   product(bool, VerifyMergedCPBytecodes, true,                              \
 979           "Verify bytecodes after RedefineClasses constant pool merging")   \
 980                                                                             \
 981   product(bool, AllowRedefinitionToAddDeleteMethods, false,                 \
 982           "Allow redefinition to add and delete private static or "         \
 983           "final methods for compatibility with old releases")              \
 984                                                                             \
 985   develop(bool, TraceBytecodes, false,                                      \
 986           "Trace bytecode execution")                                       \
 987                                                                             \
 988   develop(bool, TraceICs, false,                                            \
 989           "Trace inline cache changes")                                     \
 990                                                                             \
 991   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
 992           "Trace method invocation counter overflow")                       \
 993                                                                             \
 994   develop(bool, TraceInlineCacheClearing, false,                            \
 995           "Trace clearing of inline caches in nmethods")                    \
 996                                                                             \
 997   develop(bool, TraceDependencies, false,                                   \
 998           "Trace dependencies")                                             \
 999                                                                             \
1000   develop(bool, VerifyDependencies, trueInDebug,                            \
1001           "Exercise and verify the compilation dependency mechanism")       \
1002                                                                             \
1003   develop(bool, TraceNewOopMapGeneration, false,                            \
1004           "Trace OopMapGeneration")                                         \
1005                                                                             \
1006   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1007           "Trace OopMapGeneration: print detailed cell states")             \
1008                                                                             \
1009   develop(bool, TimeOopMap, false,                                          \
1010           "Time calls to GenerateOopMap::compute_map() in sum")             \
1011                                                                             \
1012   develop(bool, TimeOopMap2, false,                                         \
1013           "Time calls to GenerateOopMap::compute_map() individually")       \
1014                                                                             \
1015   develop(bool, TraceOopMapRewrites, false,                                 \
1016           "Trace rewriting of method oops during oop map generation")       \
1017                                                                             \
1018   develop(bool, TraceICBuffer, false,                                       \
1019           "Trace usage of IC buffer")                                       \
1020                                                                             \
1021   develop(bool, TraceCompiledIC, false,                                     \
1022           "Trace changes of compiled IC")                                   \
1023                                                                             \
1024   develop(bool, FLSVerifyDictionary, false,                                 \
1025           "Do lots of (expensive) FLS dictionary verification")             \
1026                                                                             \
1027                                                                             \
1028   notproduct(bool, CheckMemoryInitialization, false,                        \
1029           "Check memory initialization")                                    \
1030                                                                             \
1031   product(uintx, ProcessDistributionStride, 4,                              \
1032           "Stride through processors when distributing processes")          \
1033           range(0, max_juint)                                               \
1034                                                                             \
1035   develop(bool, TraceFinalizerRegistration, false,                          \
1036           "Trace registration of final references")                         \
1037                                                                             \
1038   product(bool, IgnoreEmptyClassPaths, false,                               \
1039           "Ignore empty path elements in -classpath")                       \
1040                                                                             \
1041   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
1042           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
1043           "Initial size of the boot class loader data metaspace")           \
1044           range(30*K, max_uintx/BytesPerWord)                               \
1045           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
1046                                                                             \
1047   product(bool, PrintHeapAtSIGBREAK, true,                                  \
1048           "Print heap layout in response to SIGBREAK")                      \
1049                                                                             \
1050   manageable(bool, PrintClassHistogram, false,                              \
1051           "Print a histogram of class instances")                           \
1052                                                                             \
1053   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
1054           "The percentage of the used heap that the instances of a class "  \
1055           "must occupy for the class to generate a trace event")            \
1056           range(0.0, 100.0)                                                 \
1057                                                                             \
1058   /* JVMTI heap profiling */                                                \
1059                                                                             \
1060   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
1061           "Trace JVMTI object tagging calls")                               \
1062                                                                             \
1063   diagnostic(bool, VerifyBeforeIteration, false,                            \
1064           "Verify memory system before JVMTI iteration")                    \
1065                                                                             \
1066   /* compiler interface */                                                  \
1067                                                                             \
1068   develop(bool, CIPrintCompilerName, false,                                 \
1069           "when CIPrint is active, print the name of the active compiler")  \
1070                                                                             \
1071   diagnostic(bool, CIPrintCompileQueue, false,                              \
1072           "display the contents of the compile queue whenever a "           \
1073           "compilation is enqueued")                                        \
1074                                                                             \
1075   develop(bool, CIPrintRequests, false,                                     \
1076           "display every request for compilation")                          \
1077                                                                             \
1078   product(bool, CITime, false,                                              \
1079           "collect timing information for compilation")                     \
1080                                                                             \
1081   develop(bool, CITimeVerbose, false,                                       \
1082           "be more verbose in compilation timings")                         \
1083                                                                             \
1084   develop(bool, CITimeEach, false,                                          \
1085           "display timing information after each successful compilation")   \
1086                                                                             \
1087   develop(bool, CICountOSR, false,                                          \
1088           "use a separate counter when assigning ids to osr compilations")  \
1089                                                                             \
1090   develop(bool, CICompileNatives, true,                                     \
1091           "compile native methods if supported by the compiler")            \
1092                                                                             \
1093   develop_pd(bool, CICompileOSR,                                            \
1094           "compile on stack replacement methods if supported by the "       \
1095           "compiler")                                                       \
1096                                                                             \
1097   develop(bool, CIPrintMethodCodes, false,                                  \
1098           "print method bytecodes of the compiled code")                    \
1099                                                                             \
1100   develop(bool, CIPrintTypeFlow, false,                                     \
1101           "print the results of ciTypeFlow analysis")                       \
1102                                                                             \
1103   develop(bool, CITraceTypeFlow, false,                                     \
1104           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
1105                                                                             \
1106   develop(intx, OSROnlyBCI, -1,                                             \
1107           "OSR only at this bci.  Negative values mean exclude that bci")   \
1108                                                                             \
1109   /* compiler */                                                            \
1110                                                                             \
1111   /* notice: the max range value here is max_jint, not max_intx  */         \
1112   /* because of overflow issue                                   */         \
1113   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
1114           "Number of compiler threads to run")                              \
1115           range(0, max_jint)                                                \
1116           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
1117                                                                             \
1118   product(bool, UseDynamicNumberOfCompilerThreads, true,                    \
1119           "Dynamically choose the number of parallel compiler threads")     \
1120                                                                             \
1121   diagnostic(bool, ReduceNumberOfCompilerThreads, true,                     \
1122              "Reduce the number of parallel compiler threads when they "    \
1123              "are not used")                                                \
1124                                                                             \
1125   diagnostic(bool, TraceCompilerThreads, false,                             \
1126              "Trace creation and removal of compiler threads")              \
1127                                                                             \
1128   develop(bool, InjectCompilerCreationFailure, false,                       \
1129           "Inject thread creation failures for "                            \
1130           "UseDynamicNumberOfCompilerThreads")                              \
1131                                                                             \
1132   product(intx, CompilationPolicyChoice, 0,                                 \
1133           "which compilation policy (0-2)")                                 \
1134           range(0, 2)                                                       \
1135                                                                             \
1136   develop(bool, UseStackBanging, true,                                      \
1137           "use stack banging for stack overflow checks (required for "      \
1138           "proper StackOverflow handling; disable only to measure cost "    \
1139           "of stackbanging)")                                               \
1140                                                                             \
1141   develop(bool, UseStrictFP, true,                                          \
1142           "use strict fp if modifier strictfp is set")                      \
1143                                                                             \
1144   develop(bool, GenerateSynchronizationCode, true,                          \
1145           "generate locking/unlocking code for synchronized methods and "   \
1146           "monitors")                                                       \
1147                                                                             \
1148   develop(bool, GenerateRangeChecks, true,                                  \
1149           "Generate range checks for array accesses")                       \
1150                                                                             \
1151   diagnostic_pd(bool, ImplicitNullChecks,                                   \
1152           "Generate code for implicit null checks")                         \
1153                                                                             \
1154   product_pd(bool, TrapBasedNullChecks,                                     \
1155           "Generate code for null checks that uses a cmp and trap "         \
1156           "instruction raising SIGTRAP.  This is only used if an access to" \
1157           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
1158           "ImplicitNullChecks don't work (PPC64).")                         \
1159                                                                             \
1160   diagnostic(bool, EnableThreadSMRExtraValidityChecks, true,                \
1161              "Enable Thread SMR extra validity checks")                     \
1162                                                                             \
1163   diagnostic(bool, EnableThreadSMRStatistics, trueInDebug,                  \
1164              "Enable Thread SMR Statistics")                                \
1165                                                                             \
1166   product(bool, Inline, true,                                               \
1167           "Enable inlining")                                                \
1168                                                                             \
1169   product(bool, ClipInlining, true,                                         \
1170           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
1171                                                                             \
1172   develop(bool, UseCHA, true,                                               \
1173           "Enable CHA")                                                     \
1174                                                                             \
1175   product(bool, UseTypeProfile, true,                                       \
1176           "Check interpreter profile for historically monomorphic calls")   \
1177                                                                             \
1178   diagnostic(bool, PrintInlining, false,                                    \
1179           "Print inlining optimizations")                                   \
1180                                                                             \
1181   product(bool, UsePopCountInstruction, false,                              \
1182           "Use population count instruction")                               \
1183                                                                             \
1184   develop(bool, EagerInitialization, false,                                 \
1185           "Eagerly initialize classes if possible")                         \
1186                                                                             \
1187   diagnostic(bool, LogTouchedMethods, false,                                \
1188           "Log methods which have been ever touched in runtime")            \
1189                                                                             \
1190   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
1191           "Print all methods that have been ever touched in runtime")       \
1192                                                                             \
1193   develop(bool, TraceMethodReplacement, false,                              \
1194           "Print when methods are replaced do to recompilation")            \
1195                                                                             \
1196   develop(bool, PrintMethodFlushing, false,                                 \
1197           "Print the nmethods being flushed")                               \
1198                                                                             \
1199   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
1200           "print statistics about method flushing")                         \
1201                                                                             \
1202   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
1203           "Number of compiled code invocations after which "                \
1204           "the method is considered as hot by the flusher")                 \
1205           range(1, max_jint)                                                \
1206                                                                             \
1207   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
1208           "Minimum number of sweeper passes before an nmethod "             \
1209           "can be flushed")                                                 \
1210           range(0, max_intx)                                                \
1211                                                                             \
1212   product(bool, UseCodeAging, true,                                         \
1213           "Insert counter to detect warm methods")                          \
1214                                                                             \
1215   diagnostic(bool, StressCodeAging, false,                                  \
1216           "Start with counters compiled in")                                \
1217                                                                             \
1218   develop(bool, StressCodeBuffers, false,                                   \
1219           "Exercise code buffer expansion and other rare state changes")    \
1220                                                                             \
1221   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
1222           "Generate extra debugging information for non-safepoints in "     \
1223           "nmethods")                                                       \
1224                                                                             \
1225   product(bool, PrintVMOptions, false,                                      \
1226           "Print flags that appeared on the command line")                  \
1227                                                                             \
1228   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
1229           "Ignore unrecognized VM options")                                 \
1230                                                                             \
1231   product(bool, PrintCommandLineFlags, false,                               \
1232           "Print flags specified on command line or set by ergonomics")     \
1233                                                                             \
1234   product(bool, PrintFlagsInitial, false,                                   \
1235           "Print all VM flags before argument processing and exit VM")      \
1236                                                                             \
1237   product(bool, PrintFlagsFinal, false,                                     \
1238           "Print all VM flags after argument and ergonomic processing")     \
1239                                                                             \
1240   notproduct(bool, PrintFlagsWithComments, false,                           \
1241           "Print all VM flags with default values and descriptions and "    \
1242           "exit")                                                           \
1243                                                                             \
1244   product(bool, PrintFlagsRanges, false,                                    \
1245           "Print VM flags and their ranges")                                \
1246                                                                             \
1247   diagnostic(bool, SerializeVMOutput, true,                                 \
1248           "Use a mutex to serialize output to tty and LogFile")             \
1249                                                                             \
1250   diagnostic(bool, DisplayVMOutput, true,                                   \
1251           "Display all VM output on the tty, independently of LogVMOutput") \
1252                                                                             \
1253   diagnostic(bool, LogVMOutput, false,                                      \
1254           "Save VM output to LogFile")                                      \
1255                                                                             \
1256   diagnostic(ccstr, LogFile, NULL,                                          \
1257           "If LogVMOutput or LogCompilation is on, save VM output to "      \
1258           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1259                                                                             \
1260   product(ccstr, ErrorFile, NULL,                                           \
1261           "If an error occurs, save the error data to this file "           \
1262           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
1263                                                                             \
1264   product(bool, ExtensiveErrorReports,                                      \
1265           PRODUCT_ONLY(false) NOT_PRODUCT(true),                            \
1266           "Error reports are more extensive.")                              \
1267                                                                             \
1268   product(bool, DisplayVMOutputToStderr, false,                             \
1269           "If DisplayVMOutput is true, display all VM output to stderr")    \
1270                                                                             \
1271   product(bool, DisplayVMOutputToStdout, false,                             \
1272           "If DisplayVMOutput is true, display all VM output to stdout")    \
1273                                                                             \
1274   product(bool, ErrorFileToStderr, false,                                   \
1275           "If true, error data is printed to stderr instead of a file")     \
1276                                                                             \
1277   product(bool, ErrorFileToStdout, false,                                   \
1278           "If true, error data is printed to stdout instead of a file")     \
1279                                                                             \
1280   product(bool, UseHeavyMonitors, false,                                    \
1281           "use heavyweight instead of lightweight Java monitors")           \
1282                                                                             \
1283   product(bool, PrintStringTableStatistics, false,                          \
1284           "print statistics about the StringTable and SymbolTable")         \
1285                                                                             \
1286   diagnostic(bool, VerifyStringTableAtExit, false,                          \
1287           "verify StringTable contents at exit")                            \
1288                                                                             \
1289   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
1290           "print histogram of the symbol table")                            \
1291                                                                             \
1292   notproduct(bool, ExitVMOnVerifyError, false,                              \
1293           "standard exit from VM if bytecode verify error "                 \
1294           "(only in debug mode)")                                           \
1295                                                                             \
1296   diagnostic(ccstr, AbortVMOnException, NULL,                               \
1297           "Call fatal if this exception is thrown.  Example: "              \
1298           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1299                                                                             \
1300   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
1301           "Call fatal if the exception pointed by AbortVMOnException "      \
1302           "has this message")                                               \
1303                                                                             \
1304   develop(bool, DebugVtables, false,                                        \
1305           "add debugging code to vtable dispatch")                          \
1306                                                                             \
1307   notproduct(bool, PrintVtableStats, false,                                 \
1308           "print vtables stats at end of run")                              \
1309                                                                             \
1310   develop(bool, TraceCreateZombies, false,                                  \
1311           "trace creation of zombie nmethods")                              \
1312                                                                             \
1313   notproduct(bool, IgnoreLockingAssertions, false,                          \
1314           "disable locking assertions (for speed)")                         \
1315                                                                             \
1316   product(bool, RangeCheckElimination, true,                                \
1317           "Eliminate range checks")                                         \
1318                                                                             \
1319   develop_pd(bool, UncommonNullCast,                                        \
1320           "track occurrences of null in casts; adjust compiler tactics")    \
1321                                                                             \
1322   develop(bool, TypeProfileCasts,  true,                                    \
1323           "treat casts like calls for purposes of type profiling")          \
1324                                                                             \
1325   develop(bool, TraceLivenessGen, false,                                    \
1326           "Trace the generation of liveness analysis information")          \
1327                                                                             \
1328   notproduct(bool, TraceLivenessQuery, false,                               \
1329           "Trace queries of liveness analysis information")                 \
1330                                                                             \
1331   notproduct(bool, CollectIndexSetStatistics, false,                        \
1332           "Collect information about IndexSets")                            \
1333                                                                             \
1334   develop(bool, UseLoopSafepoints, true,                                    \
1335           "Generate Safepoint nodes in every loop")                         \
1336                                                                             \
1337   develop(intx, FastAllocateSizeLimit, 128*K,                               \
1338           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
1339           "Inline allocations larger than this in doublewords must go slow")\
1340                                                                             \
1341   product_pd(bool, CompactStrings,                                          \
1342           "Enable Strings to use single byte chars in backing store")       \
1343                                                                             \
1344   product_pd(uintx, TypeProfileLevel,                                       \
1345           "=XYZ, with Z: Type profiling of arguments at call; "             \
1346                      "Y: Type profiling of return value at call; "          \
1347                      "X: Type profiling of parameters to methods; "         \
1348           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
1349           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
1350                                                                             \
1351   product(intx, TypeProfileArgsLimit,     2,                                \
1352           "max number of call arguments to consider for type profiling")    \
1353           range(0, 16)                                                      \
1354                                                                             \
1355   product(intx, TypeProfileParmsLimit,    2,                                \
1356           "max number of incoming parameters to consider for type profiling"\
1357           ", -1 for all")                                                   \
1358           range(-1, 64)                                                     \
1359                                                                             \
1360   /* statistics */                                                          \
1361   develop(bool, CountCompiledCalls, false,                                  \
1362           "Count method invocations")                                       \
1363                                                                             \
1364   notproduct(bool, CountRuntimeCalls, false,                                \
1365           "Count VM runtime calls")                                         \
1366                                                                             \
1367   develop(bool, CountJNICalls, false,                                       \
1368           "Count jni method invocations")                                   \
1369                                                                             \
1370   notproduct(bool, CountJVMCalls, false,                                    \
1371           "Count jvm method invocations")                                   \
1372                                                                             \
1373   notproduct(bool, CountRemovableExceptions, false,                         \
1374           "Count exceptions that could be replaced by branches due to "     \
1375           "inlining")                                                       \
1376                                                                             \
1377   notproduct(bool, ICMissHistogram, false,                                  \
1378           "Produce histogram of IC misses")                                 \
1379                                                                             \
1380   /* interpreter */                                                         \
1381   product_pd(bool, RewriteBytecodes,                                        \
1382           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
1383                                                                             \
1384   product_pd(bool, RewriteFrequentPairs,                                    \
1385           "Rewrite frequently used bytecode pairs into a single bytecode")  \
1386                                                                             \
1387   diagnostic(bool, PrintInterpreter, false,                                 \
1388           "Print the generated interpreter code")                           \
1389                                                                             \
1390   product(bool, UseInterpreter, true,                                       \
1391           "Use interpreter for non-compiled methods")                       \
1392                                                                             \
1393   develop(bool, UseFastSignatureHandlers, true,                             \
1394           "Use fast signature handlers for native calls")                   \
1395                                                                             \
1396   product(bool, UseLoopCounter, true,                                       \
1397           "Increment invocation counter on backward branch")                \
1398                                                                             \
1399   product_pd(bool, UseOnStackReplacement,                                   \
1400           "Use on stack replacement, calls runtime if invoc. counter "      \
1401           "overflows in loop")                                              \
1402                                                                             \
1403   notproduct(bool, TraceOnStackReplacement, false,                          \
1404           "Trace on stack replacement")                                     \
1405                                                                             \
1406   product_pd(bool, PreferInterpreterNativeStubs,                            \
1407           "Use always interpreter stubs for native methods invoked via "    \
1408           "interpreter")                                                    \
1409                                                                             \
1410   develop(bool, CountBytecodes, false,                                      \
1411           "Count number of bytecodes executed")                             \
1412                                                                             \
1413   develop(bool, PrintBytecodeHistogram, false,                              \
1414           "Print histogram of the executed bytecodes")                      \
1415                                                                             \
1416   develop(bool, PrintBytecodePairHistogram, false,                          \
1417           "Print histogram of the executed bytecode pairs")                 \
1418                                                                             \
1419   diagnostic(bool, PrintSignatureHandlers, false,                           \
1420           "Print code generated for native method signature handlers")      \
1421                                                                             \
1422   develop(bool, VerifyOops, false,                                          \
1423           "Do plausibility checks for oops")                                \
1424                                                                             \
1425   develop(bool, CheckUnhandledOops, false,                                  \
1426           "Check for unhandled oops in VM code")                            \
1427                                                                             \
1428   develop(bool, VerifyJNIFields, trueInDebug,                               \
1429           "Verify jfieldIDs for instance fields")                           \
1430                                                                             \
1431   notproduct(bool, VerifyJNIEnvThread, false,                               \
1432           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
1433           "from JNI")                                                       \
1434                                                                             \
1435   develop(bool, VerifyFPU, false,                                           \
1436           "Verify FPU state (check for NaN's, etc.)")                       \
1437                                                                             \
1438   develop(bool, VerifyThread, false,                                        \
1439           "Watch the thread register for corruption (SPARC only)")          \
1440                                                                             \
1441   develop(bool, VerifyActivationFrameSize, false,                           \
1442           "Verify that activation frame didn't become smaller than its "    \
1443           "minimal size")                                                   \
1444                                                                             \
1445   develop(bool, TraceFrequencyInlining, false,                              \
1446           "Trace frequency based inlining")                                 \
1447                                                                             \
1448   develop_pd(bool, InlineIntrinsics,                                        \
1449           "Inline intrinsics that can be statically resolved")              \
1450                                                                             \
1451   product_pd(bool, ProfileInterpreter,                                      \
1452           "Profile at the bytecode level during interpretation")            \
1453                                                                             \
1454   develop(bool, TraceProfileInterpreter, false,                             \
1455           "Trace profiling at the bytecode level during interpretation. "   \
1456           "This outputs the profiling information collected to improve "    \
1457           "jit compilation.")                                               \
1458                                                                             \
1459   develop_pd(bool, ProfileTraps,                                            \
1460           "Profile deoptimization traps at the bytecode level")             \
1461                                                                             \
1462   product(intx, ProfileMaturityPercentage, 20,                              \
1463           "number of method invocations/branches (expressed as % of "       \
1464           "CompileThreshold) before using the method's profile")            \
1465           range(0, 100)                                                     \
1466                                                                             \
1467   diagnostic(bool, PrintMethodData, false,                                  \
1468           "Print the results of +ProfileInterpreter at end of run")         \
1469                                                                             \
1470   develop(bool, VerifyDataPointer, trueInDebug,                             \
1471           "Verify the method data pointer during interpreter profiling")    \
1472                                                                             \
1473   develop(bool, VerifyCompiledCode, false,                                  \
1474           "Include miscellaneous runtime verifications in nmethod code; "   \
1475           "default off because it disturbs nmethod size heuristics")        \
1476                                                                             \
1477   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
1478           "Manually make GC thread crash then dump java stack trace;  "     \
1479           "Test only")                                                      \
1480                                                                             \
1481   /* compilation */                                                         \
1482   product(bool, UseCompiler, true,                                          \
1483           "Use Just-In-Time compilation")                                   \
1484                                                                             \
1485   product(bool, UseCounterDecay, true,                                      \
1486           "Adjust recompilation counters")                                  \
1487                                                                             \
1488   develop(intx, CounterHalfLifeTime,    30,                                 \
1489           "Half-life time of invocation counters (in seconds)")             \
1490                                                                             \
1491   develop(intx, CounterDecayMinIntervalLength,   500,                       \
1492           "The minimum interval (in milliseconds) between invocation of "   \
1493           "CounterDecay")                                                   \
1494                                                                             \
1495   product(bool, AlwaysCompileLoopMethods, false,                            \
1496           "When using recompilation, never interpret methods "              \
1497           "containing loops")                                               \
1498                                                                             \
1499   product(bool, DontCompileHugeMethods, true,                               \
1500           "Do not compile methods > HugeMethodLimit")                       \
1501                                                                             \
1502   /* Bytecode escape analysis estimation. */                                \
1503   product(bool, EstimateArgEscape, true,                                    \
1504           "Analyze bytecodes to estimate escape state of arguments")        \
1505                                                                             \
1506   product(intx, BCEATraceLevel, 0,                                          \
1507           "How much tracing to do of bytecode escape analysis estimates "   \
1508           "(0-3)")                                                          \
1509           range(0, 3)                                                       \
1510                                                                             \
1511   product(intx, MaxBCEAEstimateLevel, 5,                                    \
1512           "Maximum number of nested calls that are analyzed by BC EA")      \
1513           range(0, max_jint)                                                \
1514                                                                             \
1515   product(intx, MaxBCEAEstimateSize, 150,                                   \
1516           "Maximum bytecode size of a method to be analyzed by BC EA")      \
1517           range(0, max_jint)                                                \
1518                                                                             \
1519   product(intx,  AllocatePrefetchStyle, 1,                                  \
1520           "0 = no prefetch, "                                               \
1521           "1 = generate prefetch instructions for each allocation, "        \
1522           "2 = use TLAB watermark to gate allocation prefetch, "            \
1523           "3 = generate one prefetch instruction per cache line")           \
1524           range(0, 3)                                                       \
1525                                                                             \
1526   product(intx,  AllocatePrefetchDistance, -1,                              \
1527           "Distance to prefetch ahead of allocation pointer. "              \
1528           "-1: use system-specific value (automatically determined")        \
1529           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
1530                                                                             \
1531   product(intx,  AllocatePrefetchLines, 3,                                  \
1532           "Number of lines to prefetch ahead of array allocation pointer")  \
1533           range(1, 64)                                                      \
1534                                                                             \
1535   product(intx,  AllocateInstancePrefetchLines, 1,                          \
1536           "Number of lines to prefetch ahead of instance allocation "       \
1537           "pointer")                                                        \
1538           range(1, 64)                                                      \
1539                                                                             \
1540   product(intx,  AllocatePrefetchStepSize, 16,                              \
1541           "Step size in bytes of sequential prefetch instructions")         \
1542           range(1, 512)                                                     \
1543           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1544                                                                             \
1545   product(intx,  AllocatePrefetchInstr, 0,                                  \
1546           "Select instruction to prefetch ahead of allocation pointer")     \
1547           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
1548                                                                             \
1549   /* deoptimization */                                                      \
1550   develop(bool, TraceDeoptimization, false,                                 \
1551           "Trace deoptimization")                                           \
1552                                                                             \
1553   develop(bool, PrintDeoptimizationDetails, false,                          \
1554           "Print more information about deoptimization")                    \
1555                                                                             \
1556   develop(bool, DebugDeoptimization, false,                                 \
1557           "Tracing various information while debugging deoptimization")     \
1558                                                                             \
1559   product(intx, SelfDestructTimer, 0,                                       \
1560           "Will cause VM to terminate after a given time (in minutes) "     \
1561           "(0 means off)")                                                  \
1562           range(0, max_intx)                                                \
1563                                                                             \
1564   product(intx, MaxJavaStackTraceDepth, 1024,                               \
1565           "The maximum number of lines in the stack trace for Java "        \
1566           "exceptions (0 means all)")                                       \
1567           range(0, max_jint/2)                                              \
1568                                                                             \
1569   /* notice: the max range value here is max_jint, not max_intx  */         \
1570   /* because of overflow issue                                   */         \
1571   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
1572           "Guarantee a safepoint (at least) every so many milliseconds "    \
1573           "(0 means none)")                                                 \
1574           range(0, max_jint)                                                \
1575                                                                             \
1576   product(intx, SafepointTimeoutDelay, 10000,                               \
1577           "Delay in milliseconds for option SafepointTimeout")              \
1578   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
1579   NOT_LP64(range(0, max_intx))                                              \
1580                                                                             \
1581   product(intx, NmethodSweepActivity, 10,                                   \
1582           "Removes cold nmethods from code cache if > 0. Higher values "    \
1583           "result in more aggressive sweeping")                             \
1584           range(0, 2000)                                                    \
1585                                                                             \
1586   notproduct(bool, LogSweeper, false,                                       \
1587           "Keep a ring buffer of sweeper activity")                         \
1588                                                                             \
1589   notproduct(intx, SweeperLogEntries, 1024,                                 \
1590           "Number of records in the ring buffer of sweeper activity")       \
1591                                                                             \
1592   notproduct(intx, MemProfilingInterval, 500,                               \
1593           "Time between each invocation of the MemProfiler")                \
1594                                                                             \
1595   develop(intx, MallocCatchPtr, -1,                                         \
1596           "Hit breakpoint when mallocing/freeing this pointer")             \
1597                                                                             \
1598   notproduct(ccstrlist, SuppressErrorAt, "",                                \
1599           "List of assertions (file:line) to muzzle")                       \
1600                                                                             \
1601   develop(intx, StackPrintLimit, 100,                                       \
1602           "number of stack frames to print in VM-level stack dump")         \
1603                                                                             \
1604   notproduct(intx, MaxElementPrintSize, 256,                                \
1605           "maximum number of elements to print")                            \
1606                                                                             \
1607   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
1608           "maximum number of subklasses to print when printing klass")      \
1609                                                                             \
1610   product(intx, MaxInlineLevel, 9,                                          \
1611           "maximum number of nested calls that are inlined")                \
1612           range(0, max_jint)                                                \
1613                                                                             \
1614   product(intx, MaxRecursiveInlineLevel, 1,                                 \
1615           "maximum number of nested recursive calls that are inlined")      \
1616           range(0, max_jint)                                                \
1617                                                                             \
1618   develop(intx, MaxForceInlineLevel, 100,                                   \
1619           "maximum number of nested calls that are forced for inlining "    \
1620           "(using CompileCommand or marked w/ @ForceInline)")               \
1621           range(0, max_jint)                                                \
1622                                                                             \
1623   product_pd(intx, InlineSmallCode,                                         \
1624           "Only inline already compiled methods if their code size is "     \
1625           "less than this")                                                 \
1626           range(0, max_jint)                                                \
1627                                                                             \
1628   product(intx, MaxInlineSize, 35,                                          \
1629           "The maximum bytecode size of a method to be inlined")            \
1630           range(0, max_jint)                                                \
1631                                                                             \
1632   product_pd(intx, FreqInlineSize,                                          \
1633           "The maximum bytecode size of a frequent method to be inlined")   \
1634           range(0, max_jint)                                                \
1635                                                                             \
1636   product(intx, MaxTrivialSize, 6,                                          \
1637           "The maximum bytecode size of a trivial method to be inlined")    \
1638           range(0, max_jint)                                                \
1639                                                                             \
1640   product(intx, MinInliningThreshold, 250,                                  \
1641           "The minimum invocation count a method needs to have to be "      \
1642           "inlined")                                                        \
1643           range(0, max_jint)                                                \
1644                                                                             \
1645   develop(intx, MethodHistogramCutoff, 100,                                 \
1646           "The cutoff value for method invocation histogram (+CountCalls)") \
1647                                                                             \
1648   develop(intx, DontYieldALotInterval,    10,                               \
1649           "Interval between which yields will be dropped (milliseconds)")   \
1650                                                                             \
1651   notproduct(intx, DeoptimizeALotInterval,     5,                           \
1652           "Number of exits until DeoptimizeALot kicks in")                  \
1653                                                                             \
1654   notproduct(intx, ZombieALotInterval,     5,                               \
1655           "Number of exits until ZombieALot kicks in")                      \
1656                                                                             \
1657   diagnostic(uintx, MallocMaxTestWords,     0,                              \
1658           "If non-zero, maximum number of words that malloc/realloc can "   \
1659           "allocate (for testing only)")                                    \
1660           range(0, max_uintx)                                               \
1661                                                                             \
1662   product(intx, TypeProfileWidth, 2,                                        \
1663           "Number of receiver types to record in call/cast profile")        \
1664           range(0, 8)                                                       \
1665                                                                             \
1666   develop(intx, BciProfileWidth,      2,                                    \
1667           "Number of return bci's to record in ret profile")                \
1668                                                                             \
1669   product(intx, PerMethodRecompilationCutoff, 400,                          \
1670           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1671           range(-1, max_intx)                                               \
1672                                                                             \
1673   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
1674           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
1675           range(-1, max_intx)                                               \
1676                                                                             \
1677   product(intx, PerMethodTrapLimit,  100,                                   \
1678           "Limit on traps (of one kind) in a method (includes inlines)")    \
1679           range(0, max_jint)                                                \
1680                                                                             \
1681   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
1682           "Limit on speculative traps (of one kind) in a method "           \
1683           "(includes inlines)")                                             \
1684           range(0, max_jint)                                                \
1685                                                                             \
1686   product(intx, PerBytecodeTrapLimit,  4,                                   \
1687           "Limit on traps (of one kind) at a particular BCI")               \
1688           range(0, max_jint)                                                \
1689                                                                             \
1690   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
1691           "Extra method data trap entries for speculation")                 \
1692                                                                             \
1693   develop(intx, InlineFrequencyRatio,    20,                                \
1694           "Ratio of call site execution to caller method invocation")       \
1695           range(0, max_jint)                                                \
1696                                                                             \
1697   diagnostic_pd(intx, InlineFrequencyCount,                                 \
1698           "Count of call site execution necessary to trigger frequent "     \
1699           "inlining")                                                       \
1700           range(0, max_jint)                                                \
1701                                                                             \
1702   develop(intx, InlineThrowCount,    50,                                    \
1703           "Force inlining of interpreted methods that throw this often")    \
1704           range(0, max_jint)                                                \
1705                                                                             \
1706   develop(intx, InlineThrowMaxSize,   200,                                  \
1707           "Force inlining of throwing methods smaller than this")           \
1708           range(0, max_jint)                                                \
1709                                                                             \
1710   develop(intx, ProfilerNodeSize,  1024,                                    \
1711           "Size in K to allocate for the Profile Nodes of each thread")     \
1712           range(0, 1024)                                                    \
1713                                                                             \
1714   product_pd(size_t, MetaspaceSize,                                         \
1715           "Initial threshold (in bytes) at which a garbage collection "     \
1716           "is done to reduce Metaspace usage")                              \
1717           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
1718                                                                             \
1719   product(size_t, MaxMetaspaceSize, max_uintx,                              \
1720           "Maximum size of Metaspaces (in bytes)")                          \
1721           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
1722                                                                             \
1723   product(size_t, CompressedClassSpaceSize, 1*G,                            \
1724           "Maximum size of class area in Metaspace when compressed "        \
1725           "class pointers are used")                                        \
1726           range(1*M, 3*G)                                                   \
1727                                                                             \
1728   manageable(uintx, MinHeapFreeRatio, 40,                                   \
1729           "The minimum percentage of heap free after GC to avoid expansion."\
1730           " For most GCs this applies to the old generation. In G1 and"     \
1731           " ParallelGC it applies to the whole heap.")                      \
1732           range(0, 100)                                                     \
1733           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
1734                                                                             \
1735   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
1736           "The maximum percentage of heap free after GC to avoid shrinking."\
1737           " For most GCs this applies to the old generation. In G1 and"     \
1738           " ParallelGC it applies to the whole heap.")                      \
1739           range(0, 100)                                                     \
1740           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
1741                                                                             \
1742   product(bool, ShrinkHeapInSteps, true,                                    \
1743           "When disabled, informs the GC to shrink the java heap directly"  \
1744           " to the target size at the next full GC rather than requiring"   \
1745           " smaller steps during multiple full GCs.")                       \
1746                                                                             \
1747   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
1748           "Number of milliseconds per MB of free space in the heap")        \
1749           range(0, max_intx)                                                \
1750           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1751                                                                             \
1752   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
1753           "The minimum change in heap space due to GC (in bytes)")          \
1754           range(0, max_uintx)                                               \
1755                                                                             \
1756   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
1757           "The minimum expansion of Metaspace (in bytes)")                  \
1758           range(0, max_uintx)                                               \
1759                                                                             \
1760   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
1761           "The maximum percentage of Metaspace free after GC to avoid "     \
1762           "shrinking")                                                      \
1763           range(0, 100)                                                     \
1764           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1765                                                                             \
1766   product(uintx, MinMetaspaceFreeRatio,    40,                              \
1767           "The minimum percentage of Metaspace free after GC to avoid "     \
1768           "expansion")                                                      \
1769           range(0, 99)                                                      \
1770           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1771                                                                             \
1772   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
1773           "The maximum expansion of Metaspace without full GC (in bytes)")  \
1774           range(0, max_uintx)                                               \
1775                                                                             \
1776   /* stack parameters */                                                    \
1777   product_pd(intx, StackYellowPages,                                        \
1778           "Number of yellow zone (recoverable overflows) pages of size "    \
1779           "4KB. If pages are bigger yellow zone is aligned up.")            \
1780           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
1781                                                                             \
1782   product_pd(intx, StackRedPages,                                           \
1783           "Number of red zone (unrecoverable overflows) pages of size "     \
1784           "4KB. If pages are bigger red zone is aligned up.")               \
1785           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
1786                                                                             \
1787   product_pd(intx, StackReservedPages,                                      \
1788           "Number of reserved zone (reserved to annotated methods) pages"   \
1789           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1790           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1791                                                                             \
1792   product(bool, RestrictReservedStack, true,                                \
1793           "Restrict @ReservedStackAccess to trusted classes")               \
1794                                                                             \
1795   /* greater stack shadow pages can't generate instruction to bang stack */ \
1796   product_pd(intx, StackShadowPages,                                        \
1797           "Number of shadow zone (for overflow checking) pages of size "    \
1798           "4KB. If pages are bigger shadow zone is aligned up. "            \
1799           "This should exceed the depth of the VM and native call stack.")  \
1800           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
1801                                                                             \
1802   product_pd(intx, ThreadStackSize,                                         \
1803           "Thread Stack Size (in Kbytes)")                                  \
1804           range(0, 1 * M)                                                   \
1805                                                                             \
1806   product_pd(intx, VMThreadStackSize,                                       \
1807           "Non-Java Thread Stack Size (in Kbytes)")                         \
1808           range(0, max_intx/(1 * K))                                        \
1809                                                                             \
1810   product_pd(intx, CompilerThreadStackSize,                                 \
1811           "Compiler Thread Stack Size (in Kbytes)")                         \
1812           range(0, max_intx/(1 * K))                                        \
1813                                                                             \
1814   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
1815           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
1816                                                                             \
1817   /* code cache parameters                                    */            \
1818   develop_pd(uintx, CodeCacheSegmentSize,                                   \
1819           "Code cache segment size (in bytes) - smallest unit of "          \
1820           "allocation")                                                     \
1821           range(1, 1024)                                                    \
1822           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
1823                                                                             \
1824   develop_pd(intx, CodeEntryAlignment,                                      \
1825           "Code entry alignment for generated code (in bytes)")             \
1826           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
1827                                                                             \
1828   product_pd(intx, OptoLoopAlignment,                                       \
1829           "Align inner loops to zero relative to this modulus")             \
1830           range(1, 16)                                                      \
1831           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
1832                                                                             \
1833   product_pd(uintx, InitialCodeCacheSize,                                   \
1834           "Initial code cache size (in bytes)")                             \
1835           range(os::vm_page_size(), max_uintx)                              \
1836                                                                             \
1837   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
1838           "Minimum code cache size (in bytes) required to start VM.")       \
1839           range(0, max_uintx)                                               \
1840                                                                             \
1841   product(bool, SegmentedCodeCache, false,                                  \
1842           "Use a segmented code cache")                                     \
1843                                                                             \
1844   product_pd(uintx, ReservedCodeCacheSize,                                  \
1845           "Reserved code cache size (in bytes) - maximum code cache size")  \
1846           range(os::vm_page_size(), max_uintx)                              \
1847                                                                             \
1848   product_pd(uintx, NonProfiledCodeHeapSize,                                \
1849           "Size of code heap with non-profiled methods (in bytes)")         \
1850           range(0, max_uintx)                                               \
1851                                                                             \
1852   product_pd(uintx, ProfiledCodeHeapSize,                                   \
1853           "Size of code heap with profiled methods (in bytes)")             \
1854           range(0, max_uintx)                                               \
1855                                                                             \
1856   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
1857           "Size of code heap with non-nmethods (in bytes)")                 \
1858           range(os::vm_page_size(), max_uintx)                              \
1859                                                                             \
1860   product_pd(uintx, CodeCacheExpansionSize,                                 \
1861           "Code cache expansion size (in bytes)")                           \
1862           range(32*K, max_uintx)                                            \
1863                                                                             \
1864   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
1865           "Minimum number of segments in a code cache block")               \
1866           range(1, 100)                                                     \
1867                                                                             \
1868   notproduct(bool, ExitOnFullCodeCache, false,                              \
1869           "Exit the VM if we fill the code cache")                          \
1870                                                                             \
1871   product(bool, UseCodeCacheFlushing, true,                                 \
1872           "Remove cold/old nmethods from the code cache")                   \
1873                                                                             \
1874   product(uintx, StartAggressiveSweepingAt, 10,                             \
1875           "Start aggressive sweeping if X[%] of the code cache is free."    \
1876           "Segmented code cache: X[%] of the non-profiled heap."            \
1877           "Non-segmented code cache: X[%] of the total code cache")         \
1878           range(0, 100)                                                     \
1879                                                                             \
1880   /* AOT parameters */                                                      \
1881   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
1882           "Use AOT compiled files")                                         \
1883                                                                             \
1884   product(ccstrlist, AOTLibrary, NULL,                                      \
1885           "AOT library")                                                    \
1886                                                                             \
1887   product(bool, PrintAOT, false,                                            \
1888           "Print used AOT klasses and methods")                             \
1889                                                                             \
1890   notproduct(bool, PrintAOTStatistics, false,                               \
1891           "Print AOT statistics")                                           \
1892                                                                             \
1893   diagnostic(bool, UseAOTStrictLoading, false,                              \
1894           "Exit the VM if any of the AOT libraries has invalid config")     \
1895                                                                             \
1896   product(bool, CalculateClassFingerprint, false,                           \
1897           "Calculate class fingerprint")                                    \
1898                                                                             \
1899   /* interpreter debugging */                                               \
1900   develop(intx, BinarySwitchThreshold, 5,                                   \
1901           "Minimal number of lookupswitch entries for rewriting to binary " \
1902           "switch")                                                         \
1903                                                                             \
1904   develop(intx, StopInterpreterAt, 0,                                       \
1905           "Stop interpreter execution at specified bytecode number")        \
1906                                                                             \
1907   develop(intx, TraceBytecodesAt, 0,                                        \
1908           "Trace bytecodes starting with specified bytecode number")        \
1909                                                                             \
1910   /* compiler interface */                                                  \
1911   develop(intx, CIStart, 0,                                                 \
1912           "The id of the first compilation to permit")                      \
1913                                                                             \
1914   develop(intx, CIStop, max_jint,                                           \
1915           "The id of the last compilation to permit")                       \
1916                                                                             \
1917   develop(intx, CIStartOSR, 0,                                              \
1918           "The id of the first osr compilation to permit "                  \
1919           "(CICountOSR must be on)")                                        \
1920                                                                             \
1921   develop(intx, CIStopOSR, max_jint,                                        \
1922           "The id of the last osr compilation to permit "                   \
1923           "(CICountOSR must be on)")                                        \
1924                                                                             \
1925   develop(intx, CIBreakAtOSR, -1,                                           \
1926           "The id of osr compilation to break at")                          \
1927                                                                             \
1928   develop(intx, CIBreakAt, -1,                                              \
1929           "The id of compilation to break at")                              \
1930                                                                             \
1931   product(ccstrlist, CompileOnly, "",                                       \
1932           "List of methods (pkg/class.name) to restrict compilation to")    \
1933                                                                             \
1934   product(ccstr, CompileCommandFile, NULL,                                  \
1935           "Read compiler commands from this file [.hotspot_compiler]")      \
1936                                                                             \
1937   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
1938           "Read compiler directives from this file")                        \
1939                                                                             \
1940   product(ccstrlist, CompileCommand, "",                                    \
1941           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
1942                                                                             \
1943   develop(bool, ReplayCompiles, false,                                      \
1944           "Enable replay of compilations from ReplayDataFile")              \
1945                                                                             \
1946   product(ccstr, ReplayDataFile, NULL,                                      \
1947           "File containing compilation replay information"                  \
1948           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
1949                                                                             \
1950    product(ccstr, InlineDataFile, NULL,                                     \
1951           "File containing inlining replay information"                     \
1952           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
1953                                                                             \
1954   develop(intx, ReplaySuppressInitializers, 2,                              \
1955           "Control handling of class initialization during replay: "        \
1956           "0 - don't do anything special; "                                 \
1957           "1 - treat all class initializers as empty; "                     \
1958           "2 - treat class initializers for application classes as empty; " \
1959           "3 - allow all class initializers to run during bootstrap but "   \
1960           "    pretend they are empty after starting replay")               \
1961           range(0, 3)                                                       \
1962                                                                             \
1963   develop(bool, ReplayIgnoreInitErrors, false,                              \
1964           "Ignore exceptions thrown during initialization for replay")      \
1965                                                                             \
1966   product(bool, DumpReplayDataOnError, true,                                \
1967           "Record replay data for crashing compiler threads")               \
1968                                                                             \
1969   product(bool, CICompilerCountPerCPU, false,                               \
1970           "1 compiler thread for log(N CPUs)")                              \
1971                                                                             \
1972   notproduct(intx, CICrashAt, -1,                                           \
1973           "id of compilation to trigger assert in compiler thread for "     \
1974           "the purpose of testing, e.g. generation of replay data")         \
1975   notproduct(bool, CIObjectFactoryVerify, false,                            \
1976           "enable potentially expensive verification in ciObjectFactory")   \
1977                                                                             \
1978   diagnostic(bool, AbortVMOnCompilationFailure, false,                      \
1979           "Abort VM when method had failed to compile.")                    \
1980                                                                             \
1981   /* Priorities */                                                          \
1982   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
1983                                                                             \
1984   product(intx, ThreadPriorityPolicy, 0,                                    \
1985           "0 : Normal.                                                     "\
1986           "    VM chooses priorities that are appropriate for normal       "\
1987           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
1988           "    to normal native priority. Java priorities below "           \
1989           "    NORM_PRIORITY map to lower native priority values. On       "\
1990           "    Windows applications are allowed to use higher native       "\
1991           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
1992           "    not use the highest possible native priority,               "\
1993           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
1994           "    system threads. On Linux thread priorities are ignored      "\
1995           "    because the OS does not support static priority in          "\
1996           "    SCHED_OTHER scheduling class which is the only choice for   "\
1997           "    non-root, non-realtime applications.                        "\
1998           "1 : Aggressive.                                                 "\
1999           "    Java thread priorities map over to the entire range of      "\
2000           "    native thread priorities. Higher Java thread priorities map "\
2001           "    to higher native thread priorities. This policy should be   "\
2002           "    used with care, as sometimes it can cause performance       "\
2003           "    degradation in the application and/or the entire system. On "\
2004           "    Linux/BSD/macOS this policy requires root privilege or an   "\
2005           "    extended capability.")                                       \
2006           range(0, 1)                                                       \
2007                                                                             \
2008   product(bool, ThreadPriorityVerbose, false,                               \
2009           "Print priority changes")                                         \
2010                                                                             \
2011   product(intx, CompilerThreadPriority, -1,                                 \
2012           "The native priority at which compiler threads should run "       \
2013           "(-1 means no change)")                                           \
2014           range(min_jint, max_jint)                                         \
2015           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
2016                                                                             \
2017   product(intx, VMThreadPriority, -1,                                       \
2018           "The native priority at which the VM thread should run "          \
2019           "(-1 means no change)")                                           \
2020           range(-1, 127)                                                    \
2021                                                                             \
2022   product(intx, JavaPriority1_To_OSPriority, -1,                            \
2023           "Map Java priorities to OS priorities")                           \
2024           range(-1, 127)                                                    \
2025                                                                             \
2026   product(intx, JavaPriority2_To_OSPriority, -1,                            \
2027           "Map Java priorities to OS priorities")                           \
2028           range(-1, 127)                                                    \
2029                                                                             \
2030   product(intx, JavaPriority3_To_OSPriority, -1,                            \
2031           "Map Java priorities to OS priorities")                           \
2032           range(-1, 127)                                                    \
2033                                                                             \
2034   product(intx, JavaPriority4_To_OSPriority, -1,                            \
2035           "Map Java priorities to OS priorities")                           \
2036           range(-1, 127)                                                    \
2037                                                                             \
2038   product(intx, JavaPriority5_To_OSPriority, -1,                            \
2039           "Map Java priorities to OS priorities")                           \
2040           range(-1, 127)                                                    \
2041                                                                             \
2042   product(intx, JavaPriority6_To_OSPriority, -1,                            \
2043           "Map Java priorities to OS priorities")                           \
2044           range(-1, 127)                                                    \
2045                                                                             \
2046   product(intx, JavaPriority7_To_OSPriority, -1,                            \
2047           "Map Java priorities to OS priorities")                           \
2048           range(-1, 127)                                                    \
2049                                                                             \
2050   product(intx, JavaPriority8_To_OSPriority, -1,                            \
2051           "Map Java priorities to OS priorities")                           \
2052           range(-1, 127)                                                    \
2053                                                                             \
2054   product(intx, JavaPriority9_To_OSPriority, -1,                            \
2055           "Map Java priorities to OS priorities")                           \
2056           range(-1, 127)                                                    \
2057                                                                             \
2058   product(intx, JavaPriority10_To_OSPriority,-1,                            \
2059           "Map Java priorities to OS priorities")                           \
2060           range(-1, 127)                                                    \
2061                                                                             \
2062   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
2063           "Java thread priority 10 maps to critical scheduling priority")   \
2064                                                                             \
2065   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
2066           "Compiler thread(s) run at critical scheduling priority")         \
2067                                                                             \
2068   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
2069           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
2070                                                                             \
2071   develop(intx, NewCodeParameter,      0,                                   \
2072           "Testing Only: Create a dedicated integer parameter before "      \
2073           "putback")                                                        \
2074                                                                             \
2075   /* new oopmap storage allocation */                                       \
2076   develop(intx, MinOopMapAllocation,     8,                                 \
2077           "Minimum number of OopMap entries in an OopMapSet")               \
2078                                                                             \
2079   /* Background Compilation */                                              \
2080   develop(intx, LongCompileThreshold,     50,                               \
2081           "Used with +TraceLongCompiles")                                   \
2082                                                                             \
2083   /* recompilation */                                                       \
2084   product_pd(intx, CompileThreshold,                                        \
2085           "number of interpreted method invocations before (re-)compiling") \
2086           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
2087                                                                             \
2088   product(double, CompileThresholdScaling, 1.0,                             \
2089           "Factor to control when first compilation happens "               \
2090           "(both with and without tiered compilation): "                    \
2091           "values greater than 1.0 delay counter overflow, "                \
2092           "values between 0 and 1.0 rush counter overflow, "                \
2093           "value of 1.0 leaves compilation thresholds unchanged "           \
2094           "value of 0.0 is equivalent to -Xint. "                           \
2095           ""                                                                \
2096           "Flag can be set as per-method option. "                          \
2097           "If a value is specified for a method, compilation thresholds "   \
2098           "for that method are scaled by both the value of the global flag "\
2099           "and the value of the per-method flag.")                          \
2100           range(0.0, DBL_MAX)                                               \
2101                                                                             \
2102   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
2103           "Interpreter (tier 0) invocation notification frequency")         \
2104           range(0, 30)                                                      \
2105                                                                             \
2106   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
2107           "C1 without MDO (tier 2) invocation notification frequency")      \
2108           range(0, 30)                                                      \
2109                                                                             \
2110   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
2111           "C1 with MDO profiling (tier 3) invocation notification "         \
2112           "frequency")                                                      \
2113           range(0, 30)                                                      \
2114                                                                             \
2115   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
2116           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
2117           range(0, 30)                                                      \
2118                                                                             \
2119   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
2120           "Interpreter (tier 0) invocation notification frequency")         \
2121           range(0, 30)                                                      \
2122                                                                             \
2123   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
2124           "C1 without MDO (tier 2) invocation notification frequency")      \
2125           range(0, 30)                                                      \
2126                                                                             \
2127   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
2128           "C1 with MDO profiling (tier 3) invocation notification "         \
2129           "frequency")                                                      \
2130           range(0, 30)                                                      \
2131                                                                             \
2132   product(intx, Tier2CompileThreshold, 0,                                   \
2133           "threshold at which tier 2 compilation is invoked")               \
2134           range(0, max_jint)                                                \
2135                                                                             \
2136   product(intx, Tier2BackEdgeThreshold, 0,                                  \
2137           "Back edge threshold at which tier 2 compilation is invoked")     \
2138           range(0, max_jint)                                                \
2139                                                                             \
2140   product(intx, Tier3InvocationThreshold, 200,                              \
2141           "Compile if number of method invocations crosses this "           \
2142           "threshold")                                                      \
2143           range(0, max_jint)                                                \
2144                                                                             \
2145   product(intx, Tier3MinInvocationThreshold, 100,                           \
2146           "Minimum invocation to compile at tier 3")                        \
2147           range(0, max_jint)                                                \
2148                                                                             \
2149   product(intx, Tier3CompileThreshold, 2000,                                \
2150           "Threshold at which tier 3 compilation is invoked (invocation "   \
2151           "minimum must be satisfied)")                                     \
2152           range(0, max_jint)                                                \
2153                                                                             \
2154   product(intx, Tier3BackEdgeThreshold,  60000,                             \
2155           "Back edge threshold at which tier 3 OSR compilation is invoked") \
2156           range(0, max_jint)                                                \
2157                                                                             \
2158   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
2159           "Compile if number of method invocations crosses this "           \
2160           "threshold if coming from AOT")                                   \
2161           range(0, max_jint)                                                \
2162                                                                             \
2163   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
2164           "Minimum invocation to compile at tier 3 if coming from AOT")     \
2165           range(0, max_jint)                                                \
2166                                                                             \
2167   product(intx, Tier3AOTCompileThreshold, 15000,                            \
2168           "Threshold at which tier 3 compilation is invoked (invocation "   \
2169           "minimum must be satisfied) if coming from AOT")                  \
2170           range(0, max_jint)                                                \
2171                                                                             \
2172   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
2173           "Back edge threshold at which tier 3 OSR compilation is invoked " \
2174           "if coming from AOT")                                             \
2175           range(0, max_jint)                                                \
2176                                                                             \
2177   product(intx, Tier4InvocationThreshold, 5000,                             \
2178           "Compile if number of method invocations crosses this "           \
2179           "threshold")                                                      \
2180           range(0, max_jint)                                                \
2181                                                                             \
2182   product(intx, Tier4MinInvocationThreshold, 600,                           \
2183           "Minimum invocation to compile at tier 4")                        \
2184           range(0, max_jint)                                                \
2185                                                                             \
2186   product(intx, Tier4CompileThreshold, 15000,                               \
2187           "Threshold at which tier 4 compilation is invoked (invocation "   \
2188           "minimum must be satisfied")                                      \
2189           range(0, max_jint)                                                \
2190                                                                             \
2191   product(intx, Tier4BackEdgeThreshold, 40000,                              \
2192           "Back edge threshold at which tier 4 OSR compilation is invoked") \
2193           range(0, max_jint)                                                \
2194                                                                             \
2195   product(intx, Tier3DelayOn, 5,                                            \
2196           "If C2 queue size grows over this amount per compiler thread "    \
2197           "stop compiling at tier 3 and start compiling at tier 2")         \
2198           range(0, max_jint)                                                \
2199                                                                             \
2200   product(intx, Tier3DelayOff, 2,                                           \
2201           "If C2 queue size is less than this amount per compiler thread "  \
2202           "allow methods compiled at tier 2 transition to tier 3")          \
2203           range(0, max_jint)                                                \
2204                                                                             \
2205   product(intx, Tier3LoadFeedback, 5,                                       \
2206           "Tier 3 thresholds will increase twofold when C1 queue size "     \
2207           "reaches this amount per compiler thread")                        \
2208           range(0, max_jint)                                                \
2209                                                                             \
2210   product(intx, Tier4LoadFeedback, 3,                                       \
2211           "Tier 4 thresholds will increase twofold when C2 queue size "     \
2212           "reaches this amount per compiler thread")                        \
2213           range(0, max_jint)                                                \
2214                                                                             \
2215   product(intx, TieredCompileTaskTimeout, 50,                               \
2216           "Kill compile task if method was not used within "                \
2217           "given timeout in milliseconds")                                  \
2218           range(0, max_intx)                                                \
2219                                                                             \
2220   product(intx, TieredStopAtLevel, 4,                                       \
2221           "Stop at given compilation level")                                \
2222           range(0, 4)                                                       \
2223                                                                             \
2224   product(intx, Tier0ProfilingStartPercentage, 200,                         \
2225           "Start profiling in interpreter if the counters exceed tier 3 "   \
2226           "thresholds by the specified percentage")                         \
2227           range(0, max_jint)                                                \
2228                                                                             \
2229   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
2230           "Increase the compile threshold for C1 compilation if the code "  \
2231           "cache is filled by the specified percentage")                    \
2232           range(0, 99)                                                      \
2233                                                                             \
2234   product(intx, TieredRateUpdateMinTime, 1,                                 \
2235           "Minimum rate sampling interval (in milliseconds)")               \
2236           range(0, max_intx)                                                \
2237                                                                             \
2238   product(intx, TieredRateUpdateMaxTime, 25,                                \
2239           "Maximum rate sampling interval (in milliseconds)")               \
2240           range(0, max_intx)                                                \
2241                                                                             \
2242   product_pd(bool, TieredCompilation,                                       \
2243           "Enable tiered compilation")                                      \
2244                                                                             \
2245   product(bool, PrintTieredEvents, false,                                   \
2246           "Print tiered events notifications")                              \
2247                                                                             \
2248   product_pd(intx, OnStackReplacePercentage,                                \
2249           "NON_TIERED number of method invocations/branches (expressed as " \
2250           "% of CompileThreshold) before (re-)compiling OSR code")          \
2251           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
2252                                                                             \
2253   product(intx, InterpreterProfilePercentage, 33,                           \
2254           "NON_TIERED number of method invocations/branches (expressed as " \
2255           "% of CompileThreshold) before profiling in the interpreter")     \
2256           range(0, 100)                                                     \
2257                                                                             \
2258   develop(intx, MaxRecompilationSearchLength,    10,                        \
2259           "The maximum number of frames to inspect when searching for "     \
2260           "recompilee")                                                     \
2261                                                                             \
2262   develop(intx, MaxInterpretedSearchLength,     3,                          \
2263           "The maximum number of interpreted frames to skip when searching "\
2264           "for recompilee")                                                 \
2265                                                                             \
2266   develop(intx, DesiredMethodLimit,  8000,                                  \
2267           "The desired maximum method size (in bytecodes) after inlining")  \
2268                                                                             \
2269   develop(intx, HugeMethodLimit,  8000,                                     \
2270           "Don't compile methods larger than this if "                      \
2271           "+DontCompileHugeMethods")                                        \
2272                                                                             \
2273   /* Properties for Java libraries  */                                      \
2274                                                                             \
2275   product(uint64_t, MaxDirectMemorySize, 0,                                 \
2276           "Maximum total size of NIO direct-buffer allocations")            \
2277           range(0, max_jlong)                                               \
2278                                                                             \
2279   /* Flags used for temporary code during development  */                   \
2280                                                                             \
2281   diagnostic(bool, UseNewCode, false,                                       \
2282           "Testing Only: Use the new version while testing")                \
2283                                                                             \
2284   diagnostic(bool, UseNewCode2, false,                                      \
2285           "Testing Only: Use the new version while testing")                \
2286                                                                             \
2287   diagnostic(bool, UseNewCode3, false,                                      \
2288           "Testing Only: Use the new version while testing")                \
2289                                                                             \
2290   /* flags for performance data collection */                               \
2291                                                                             \
2292   product(bool, UsePerfData, true,                                          \
2293           "Flag to disable jvmstat instrumentation for performance testing "\
2294           "and problem isolation purposes")                                 \
2295                                                                             \
2296   product(bool, PerfDataSaveToFile, false,                                  \
2297           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
2298                                                                             \
2299   product(ccstr, PerfDataSaveFile, NULL,                                    \
2300           "Save PerfData memory to the specified absolute pathname. "       \
2301           "The string %p in the file name (if present) "                    \
2302           "will be replaced by pid")                                        \
2303                                                                             \
2304   product(intx, PerfDataSamplingInterval, 50,                               \
2305           "Data sampling interval (in milliseconds)")                       \
2306           range(PeriodicTask::min_interval, max_jint)                       \
2307           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
2308                                                                             \
2309   product(bool, PerfDisableSharedMem, false,                                \
2310           "Store performance data in standard memory")                      \
2311                                                                             \
2312   product(intx, PerfDataMemorySize, 32*K,                                   \
2313           "Size of performance data memory region. Will be rounded "        \
2314           "up to a multiple of the native os page size.")                   \
2315           range(128, 32*64*K)                                               \
2316                                                                             \
2317   product(intx, PerfMaxStringConstLength, 1024,                             \
2318           "Maximum PerfStringConstant string length before truncation")     \
2319           range(32, 32*K)                                                   \
2320                                                                             \
2321   product(bool, PerfAllowAtExitRegistration, false,                         \
2322           "Allow registration of atexit() methods")                         \
2323                                                                             \
2324   product(bool, PerfBypassFileSystemCheck, false,                           \
2325           "Bypass Win32 file system criteria checks (Windows Only)")        \
2326                                                                             \
2327   product(intx, UnguardOnExecutionViolation, 0,                             \
2328           "Unguard page and retry on no-execute fault (Win32 only) "        \
2329           "0=off, 1=conservative, 2=aggressive")                            \
2330           range(0, 2)                                                       \
2331                                                                             \
2332   /* Serviceability Support */                                              \
2333                                                                             \
2334   product(bool, ManagementServer, false,                                    \
2335           "Create JMX Management Server")                                   \
2336                                                                             \
2337   product(bool, DisableAttachMechanism, false,                              \
2338           "Disable mechanism that allows tools to attach to this VM")       \
2339                                                                             \
2340   product(bool, StartAttachListener, false,                                 \
2341           "Always start Attach Listener at VM startup")                     \
2342                                                                             \
2343   product(bool, EnableDynamicAgentLoading, true,                            \
2344           "Allow tools to load agents with the attach mechanism")           \
2345                                                                             \
2346   manageable(bool, PrintConcurrentLocks, false,                             \
2347           "Print java.util.concurrent locks in thread dump")                \
2348                                                                             \
2349   /* Shared spaces */                                                       \
2350                                                                             \
2351   product(bool, UseSharedSpaces, true,                                      \
2352           "Use shared spaces for metadata")                                 \
2353                                                                             \
2354   product(bool, VerifySharedSpaces, false,                                  \
2355           "Verify shared spaces (false for default archive, true for "      \
2356           "archive specified by -XX:SharedArchiveFile)")                    \
2357                                                                             \
2358   product(bool, RequireSharedSpaces, false,                                 \
2359           "Require shared spaces for metadata")                             \
2360                                                                             \
2361   product(bool, DumpSharedSpaces, false,                                    \
2362           "Special mode: JVM reads a class list, loads classes, builds "    \
2363           "shared spaces, and dumps the shared spaces to a file to be "     \
2364           "used in future JVM runs")                                        \
2365                                                                             \
2366   product(bool, PrintSharedArchiveAndExit, false,                           \
2367           "Print shared archive file contents")                             \
2368                                                                             \
2369   product(bool, PrintSharedDictionary, false,                               \
2370           "If PrintSharedArchiveAndExit is true, also print the shared "    \
2371           "dictionary")                                                     \
2372                                                                             \
2373   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
2374           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
2375           "Address to allocate shared memory region for class data")        \
2376           range(0, SIZE_MAX)                                                \
2377                                                                             \
2378   product(ccstr, SharedArchiveConfigFile, NULL,                             \
2379           "Data to add to the CDS archive file")                            \
2380                                                                             \
2381   product(uintx, SharedSymbolTableBucketSize, 4,                            \
2382           "Average number of symbols per bucket in shared table")           \
2383           range(2, 246)                                                     \
2384                                                                             \
2385   diagnostic(bool, AllowArchivingWithJavaAgent, false,                      \
2386           "Allow Java agent to be run with CDS dumping")                    \
2387                                                                             \
2388   diagnostic(bool, PrintMethodHandleStubs, false,                           \
2389           "Print generated stub code for method handles")                   \
2390                                                                             \
2391   develop(bool, TraceMethodHandles, false,                                  \
2392           "trace internal method handle operations")                        \
2393                                                                             \
2394   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
2395           "perform extra checks when constructing method handles")          \
2396                                                                             \
2397   diagnostic(bool, ShowHiddenFrames, false,                                 \
2398           "show method handle implementation frames (usually hidden)")      \
2399                                                                             \
2400   experimental(bool, TrustFinalNonStaticFields, false,                      \
2401           "trust final non-static declarations for constant folding")       \
2402                                                                             \
2403   diagnostic(bool, FoldStableValues, true,                                  \
2404           "Optimize loads from stable fields (marked w/ @Stable)")          \
2405                                                                             \
2406   develop(bool, TraceInvokeDynamic, false,                                  \
2407           "trace internal invoke dynamic operations")                       \
2408                                                                             \
2409   diagnostic(int, UseBootstrapCallInfo, 1,                                  \
2410           "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2411           "resolved before the bootstrap method is called; 1: when a BSM "  \
2412           "that may accept a BootstrapCallInfo is detected, use that API "  \
2413           "to pass BSM arguments, which allows the BSM to delay their "     \
2414           "resolution; 2+: stress test the BCI API by calling more BSMs "   \
2415           "via that API, instead of with the eagerly-resolved array.")      \
2416                                                                             \
2417   diagnostic(bool, PauseAtStartup,      false,                              \
2418           "Causes the VM to pause at startup time and wait for the pause "  \
2419           "file to be removed (default: ./vm.paused.<pid>)")                \
2420                                                                             \
2421   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
2422           "The file to create and for whose removal to await when pausing " \
2423           "at startup. (default: ./vm.paused.<pid>)")                       \
2424                                                                             \
2425   diagnostic(bool, PauseAtExit, false,                                      \
2426           "Pause and wait for keypress on exit if a debugger is attached")  \
2427                                                                             \
2428   product(bool, ExtendedDTraceProbes,    false,                             \
2429           "Enable performance-impacting dtrace probes")                     \
2430                                                                             \
2431   product(bool, DTraceMethodProbes, false,                                  \
2432           "Enable dtrace probes for method-entry and method-exit")          \
2433                                                                             \
2434   product(bool, DTraceAllocProbes, false,                                   \
2435           "Enable dtrace probes for object allocation")                     \
2436                                                                             \
2437   product(bool, DTraceMonitorProbes, false,                                 \
2438           "Enable dtrace probes for monitor events")                        \
2439                                                                             \
2440   product(bool, RelaxAccessControlCheck, false,                             \
2441           "Relax the access control checks in the verifier")                \
2442                                                                             \
2443   product(uintx, StringTableSize, defaultStringTableSize,                   \
2444           "Number of buckets in the interned String table "                 \
2445           "(will be rounded to nearest higher power of 2)")                 \
2446           range(minimumStringTableSize, 16777216ul)                         \
2447                                                                             \
2448   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
2449           "Number of buckets in the JVM internal Symbol table")             \
2450           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
2451                                                                             \
2452   product(bool, UseStringDeduplication, false,                              \
2453           "Use string deduplication")                                       \
2454                                                                             \
2455   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
2456           "A string must reach this age (or be promoted to an old region) " \
2457           "to be considered for deduplication")                             \
2458           range(1, markOopDesc::max_age)                                    \
2459                                                                             \
2460   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
2461           "Force table resize every time the table is scanned")             \
2462                                                                             \
2463   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
2464           "Force table rehash every time the table is scanned")             \
2465                                                                             \
2466   diagnostic(bool, WhiteBoxAPI, false,                                      \
2467           "Enable internal testing APIs")                                   \
2468                                                                             \
2469   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
2470            "Default survivor space alignment in bytes")                     \
2471            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
2472                                                                             \
2473   product(ccstr, DumpLoadedClassList, NULL,                                 \
2474           "Dump the names all loaded classes, that could be stored into "   \
2475           "the CDS archive, in the specified file")                         \
2476                                                                             \
2477   product(ccstr, SharedClassListFile, NULL,                                 \
2478           "Override the default CDS class list")                            \
2479                                                                             \
2480   product(ccstr, SharedArchiveFile, NULL,                                   \
2481           "Override the default location of the CDS archive file")          \
2482                                                                             \
2483   product(ccstr, ExtraSharedClassListFile, NULL,                            \
2484           "Extra classlist for building the CDS archive file")              \
2485                                                                             \
2486   experimental(size_t, ArrayAllocatorMallocLimit,                           \
2487           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
2488           "Allocation less than this value will be allocated "              \
2489           "using malloc. Larger allocations will use mmap.")                \
2490                                                                             \
2491   experimental(bool, AlwaysAtomicAccesses, false,                           \
2492           "Accesses to all variables should always be atomic")              \
2493                                                                             \
2494   diagnostic(bool, UseUnalignedAccesses, false,                             \
2495           "Use unaligned memory accesses in Unsafe")                        \
2496                                                                             \
2497   product_pd(bool, PreserveFramePointer,                                    \
2498              "Use the FP register for holding the frame pointer "           \
2499              "and not as a general purpose register.")                      \
2500                                                                             \
2501   diagnostic(bool, CheckIntrinsics, true,                                   \
2502              "When a class C is loaded, check that "                        \
2503              "(1) all intrinsics defined by the VM for class C are present "\
2504              "in the loaded class file and are marked with the "            \
2505              "@HotSpotIntrinsicCandidate annotation, that "                 \
2506              "(2) there is an intrinsic registered for all loaded methods " \
2507              "that are annotated with the @HotSpotIntrinsicCandidate "      \
2508              "annotation, and that "                                        \
2509              "(3) no orphan methods exist for class C (i.e., methods for "  \
2510              "which the VM declares an intrinsic but that are not declared "\
2511              "in the loaded class C. "                                      \
2512              "Check (3) is available only in debug builds.")                \
2513                                                                             \
2514   diagnostic_pd(intx, InitArrayShortSize,                                   \
2515           "Threshold small size (in bytes) for clearing arrays. "           \
2516           "Anything this size or smaller may get converted to discrete "    \
2517           "scalar stores.")                                                 \
2518           range(0, max_intx)                                                \
2519           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
2520                                                                             \
2521   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
2522              "Disable backwards compatibility for compile commands.")       \
2523                                                                             \
2524   diagnostic(bool, CompilerDirectivesPrint, false,                          \
2525              "Print compiler directives on installation.")                  \
2526   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
2527              "Limit on number of compiler directives.")                     \
2528                                                                             \
2529   product(ccstr, AllocateHeapAt, NULL,                                      \
2530           "Path to the directoy where a temporary file will be created "    \
2531           "to use as the backing store for Java Heap.")                     \
2532                                                                             \
2533   experimental(ccstr, AllocateOldGenAt, NULL,                               \
2534           "Path to the directoy where a temporary file will be "            \
2535           "created to use as the backing store for old generation."         \
2536           "File of size Xmx is pre-allocated for performance reason, so"    \
2537           "we need that much space available")                              \
2538                                                                             \
2539   develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0),       \
2540                "Run periodic metaspace verifications (0 - none, "           \
2541                "1 - always, >1 every nth interval)")                        \
2542                                                                             \
2543   diagnostic(bool, ShowRegistersOnAssert, true,                             \
2544           "On internal errors, include registers in error report.")         \
2545                                                                             \
2546   experimental(bool, UseSwitchProfiling, true,                              \
2547           "leverage profiling for table/lookup switch")                     \
2548                                                                             \
2549   JFR_ONLY(product(bool, FlightRecorder, false,                             \
2550           "Enable Flight Recorder"))                                        \
2551                                                                             \
2552   JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL,                      \
2553           "Flight Recorder options"))                                       \
2554                                                                             \
2555   JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
2556           "Start flight recording with options"))                           \
2557                                                                             \
2558   experimental(bool, UseFastUnorderedTimeStamps, false,                     \
2559           "Use platform unstable time where supported for timestamps only")
2560 
2561 #define VM_FLAGS(develop,                                                   \
2562                  develop_pd,                                                \
2563                  product,                                                   \
2564                  product_pd,                                                \
2565                  diagnostic,                                                \
2566                  diagnostic_pd,                                             \
2567                  experimental,                                              \
2568                  notproduct,                                                \
2569                  manageable,                                                \
2570                  product_rw,                                                \
2571                  lp64_product,                                              \
2572                  range,                                                     \
2573                  constraint,                                                \
2574                  writeable)                                                 \
2575                                                                             \
2576   RUNTIME_FLAGS(                                                            \
2577     develop,                                                                \
2578     develop_pd,                                                             \
2579     product,                                                                \
2580     product_pd,                                                             \
2581     diagnostic,                                                             \
2582     diagnostic_pd,                                                          \
2583     experimental,                                                           \
2584     notproduct,                                                             \
2585     manageable,                                                             \
2586     product_rw,                                                             \
2587     lp64_product,                                                           \
2588     range,                                                                  \
2589     constraint,                                                             \
2590     writeable)                                                              \
2591                                                                             \
2592   GC_FLAGS(                                                                 \
2593     develop,                                                                \
2594     develop_pd,                                                             \
2595     product,                                                                \
2596     product_pd,                                                             \
2597     diagnostic,                                                             \
2598     diagnostic_pd,                                                          \
2599     experimental,                                                           \
2600     notproduct,                                                             \
2601     manageable,                                                             \
2602     product_rw,                                                             \
2603     lp64_product,                                                           \
2604     range,                                                                  \
2605     constraint,                                                             \
2606     writeable)                                                              \
2607 
2608 /*
2609  *  Macros for factoring of globals
2610  */
2611 
2612 // Interface macros
2613 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
2614 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
2615 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
2616 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
2617 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
2618 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
2619 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
2620 #ifdef PRODUCT
2621 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
2622 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
2623 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
2624 #else
2625 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
2626 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
2627 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
2628 #endif // PRODUCT
2629 // Special LP64 flags, product only needed for now.
2630 #ifdef _LP64
2631 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2632 #else
2633 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
2634 #endif // _LP64
2635 
2636 // Implementation macros
2637 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
2638 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
2639 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
2640 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
2641 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
2642 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
2643 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
2644 #ifdef PRODUCT
2645 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
2646 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
2647 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
2648 #else
2649 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
2650 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
2651 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
2652 #endif // PRODUCT
2653 #ifdef _LP64
2654 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
2655 #else
2656 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
2657 #endif // _LP64
2658 
2659 // Only materialize src code for range checking when required, ignore otherwise
2660 #define IGNORE_RANGE(a, b)
2661 // Only materialize src code for contraint checking when required, ignore otherwise
2662 #define IGNORE_CONSTRAINT(func,type)
2663 
2664 #define IGNORE_WRITEABLE(type)
2665 
2666 VM_FLAGS(DECLARE_DEVELOPER_FLAG, \
2667          DECLARE_PD_DEVELOPER_FLAG, \
2668          DECLARE_PRODUCT_FLAG, \
2669          DECLARE_PD_PRODUCT_FLAG, \
2670          DECLARE_DIAGNOSTIC_FLAG, \
2671          DECLARE_PD_DIAGNOSTIC_FLAG, \
2672          DECLARE_EXPERIMENTAL_FLAG, \
2673          DECLARE_NOTPRODUCT_FLAG, \
2674          DECLARE_MANAGEABLE_FLAG, \
2675          DECLARE_PRODUCT_RW_FLAG, \
2676          DECLARE_LP64_PRODUCT_FLAG, \
2677          IGNORE_RANGE, \
2678          IGNORE_CONSTRAINT, \
2679          IGNORE_WRITEABLE)
2680 
2681 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
2682                  DECLARE_PD_DEVELOPER_FLAG, \
2683                  DECLARE_PRODUCT_FLAG, \
2684                  DECLARE_PD_PRODUCT_FLAG, \
2685                  DECLARE_DIAGNOSTIC_FLAG, \
2686                  DECLARE_PD_DIAGNOSTIC_FLAG, \
2687                  DECLARE_NOTPRODUCT_FLAG, \
2688                  IGNORE_RANGE, \
2689                  IGNORE_CONSTRAINT, \
2690                  IGNORE_WRITEABLE)
2691 
2692 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
2693            DECLARE_PRODUCT_FLAG, \
2694            DECLARE_DIAGNOSTIC_FLAG, \
2695            DECLARE_EXPERIMENTAL_FLAG, \
2696            DECLARE_NOTPRODUCT_FLAG, \
2697            IGNORE_RANGE, \
2698            IGNORE_CONSTRAINT, \
2699            IGNORE_WRITEABLE)
2700 
2701 // Extensions
2702 
2703 #include "runtime/globals_ext.hpp"
2704 
2705 #endif // SHARE_RUNTIME_GLOBALS_HPP
--- EOF ---