1 /*
   2  * Copyright (c) 1997, 2018, 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_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_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 #include CPU_HEADER(globals)
  57 #include OS_HEADER(globals)
  58 #include OS_CPU_HEADER(globals)
  59 #ifdef COMPILER1
  60 #include CPU_HEADER(c1_globals)
  61 #include OS_HEADER(c1_globals)
  62 #endif
  63 #ifdef COMPILER2
  64 #include CPU_HEADER(c2_globals)
  65 #include OS_HEADER(c2_globals)
  66 #endif
  67 
  68 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI
  69 define_pd_global(bool, BackgroundCompilation,        false);
  70 define_pd_global(bool, UseTLAB,                      false);
  71 define_pd_global(bool, CICompileOSR,                 false);
  72 define_pd_global(bool, UseTypeProfile,               false);
  73 define_pd_global(bool, UseOnStackReplacement,        false);
  74 define_pd_global(bool, InlineIntrinsics,             false);
  75 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  76 define_pd_global(bool, ProfileInterpreter,           false);
  77 define_pd_global(bool, ProfileTraps,                 false);
  78 define_pd_global(bool, TieredCompilation,            false);
  79 
  80 define_pd_global(intx, CompileThreshold,             0);
  81 
  82 define_pd_global(intx,   OnStackReplacePercentage,   0);
  83 define_pd_global(bool,   ResizeTLAB,                 false);
  84 define_pd_global(intx,   FreqInlineSize,             0);
  85 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
  86 define_pd_global(bool,   InlineClassNatives,         true);
  87 define_pd_global(bool,   InlineUnsafeOps,            true);
  88 define_pd_global(uintx,  InitialCodeCacheSize,       160*K);
  89 define_pd_global(uintx,  ReservedCodeCacheSize,      32*M);
  90 define_pd_global(uintx,  NonProfiledCodeHeapSize,    0);
  91 define_pd_global(uintx,  ProfiledCodeHeapSize,       0);
  92 define_pd_global(uintx,  NonNMethodCodeHeapSize,     32*M);
  93 
  94 define_pd_global(uintx,  CodeCacheExpansionSize,     32*K);
  95 define_pd_global(uintx,  CodeCacheMinBlockLength,    1);
  96 define_pd_global(uintx,  CodeCacheMinimumUseSpace,   200*K);
  97 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
  98 define_pd_global(bool, NeverActAsServerClassMachine, true);
  99 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 100 #define CI_COMPILER_COUNT 0
 101 #else
 102 
 103 #if COMPILER2_OR_JVMCI
 104 #define CI_COMPILER_COUNT 2
 105 #else
 106 #define CI_COMPILER_COUNT 1
 107 #endif // COMPILER2_OR_JVMCI
 108 
 109 #endif // no compilers
 110 
 111 // use this for flags that are true by default in the debug version but
 112 // false in the optimized version, and vice versa
 113 #ifdef ASSERT
 114 #define trueInDebug  true
 115 #define falseInDebug false
 116 #else
 117 #define trueInDebug  false
 118 #define falseInDebug true
 119 #endif
 120 
 121 // use this for flags that are true per default in the product build
 122 // but false in development builds, and vice versa
 123 #ifdef PRODUCT
 124 #define trueInProduct  true
 125 #define falseInProduct false
 126 #else
 127 #define trueInProduct  false
 128 #define falseInProduct true
 129 #endif
 130 
 131 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 132 // product flags are always settable / visible
 133 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 134 
 135 // A flag must be declared with one of the following types:
 136 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 137 // The type "ccstr" is an alias for "const char*" and is used
 138 // only in this file, because the macrology requires single-token type names.
 139 
 140 // Note: Diagnostic options not meant for VM tuning or for product modes.
 141 // They are to be used for VM quality assurance or field diagnosis
 142 // of VM bugs.  They are hidden so that users will not be encouraged to
 143 // try them as if they were VM ordinary execution options.  However, they
 144 // are available in the product version of the VM.  Under instruction
 145 // from support engineers, VM customers can turn them on to collect
 146 // diagnostic information about VM problems.  To use a VM diagnostic
 147 // option, you must first specify +UnlockDiagnosticVMOptions.
 148 // (This master switch also affects the behavior of -Xprintflags.)
 149 //
 150 // experimental flags are in support of features that are not
 151 //    part of the officially supported product, but are available
 152 //    for experimenting with. They could, for example, be performance
 153 //    features that may not have undergone full or rigorous QA, but which may
 154 //    help performance in some cases and released for experimentation
 155 //    by the community of users and developers. This flag also allows one to
 156 //    be able to build a fully supported product that nonetheless also
 157 //    ships with some unsupported, lightly tested, experimental features.
 158 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 159 //    UnlockExperimentalVMOptions flag, which allows the control and
 160 //    modification of the experimental flags.
 161 //
 162 // Nota bene: neither diagnostic nor experimental options should be used casually,
 163 //    and they are not supported on production loads, except under explicit
 164 //    direction from support engineers.
 165 //
 166 // manageable flags are writeable external product flags.
 167 //    They are dynamically writeable through the JDK management interface
 168 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 169 //    These flags are external exported interface (see CCC).  The list of
 170 //    manageable flags can be queried programmatically through the management
 171 //    interface.
 172 //
 173 //    A flag can be made as "manageable" only if
 174 //    - the flag is defined in a CCC as an external exported interface.
 175 //    - the VM implementation supports dynamic setting of the flag.
 176 //      This implies that the VM must *always* query the flag variable
 177 //      and not reuse state related to the flag state at any given time.
 178 //    - you want the flag to be queried programmatically by the customers.
 179 //
 180 // product_rw flags are writeable internal product flags.
 181 //    They are like "manageable" flags but for internal/private use.
 182 //    The list of product_rw flags are internal/private flags which
 183 //    may be changed/removed in a future release.  It can be set
 184 //    through the management interface to get/set value
 185 //    when the name of flag is supplied.
 186 //
 187 //    A flag can be made as "product_rw" only if
 188 //    - the VM implementation supports dynamic setting of the flag.
 189 //      This implies that the VM must *always* query the flag variable
 190 //      and not reuse state related to the flag state at any given time.
 191 //
 192 // Note that when there is a need to support develop flags to be writeable,
 193 // it can be done in the same way as product_rw.
 194 //
 195 // range is a macro that will expand to min and max arguments for range
 196 //    checking code if provided - see jvmFlagRangeList.hpp
 197 //
 198 // constraint is a macro that will expand to custom function call
 199 //    for constraint checking if provided - see jvmFlagConstraintList.hpp
 200 //
 201 // writeable is a macro that controls if and how the value can change during the runtime
 202 //
 203 // writeable(Always) is optional and allows the flag to have its value changed
 204 //    without any limitations at any time
 205 //
 206 // writeable(Once) flag value's can be only set once during the lifetime of VM
 207 //
 208 // writeable(CommandLineOnly) flag value's can be only set from command line
 209 //    (multiple times allowed)
 210 //
 211 
 212 
 213 #define RUNTIME_FLAGS(develop, \
 214                       develop_pd, \
 215                       product, \
 216                       product_pd, \
 217                       diagnostic, \
 218                       diagnostic_pd, \
 219                       experimental, \
 220                       notproduct, \
 221                       manageable, \
 222                       product_rw, \
 223                       lp64_product, \
 224                       range, \
 225                       constraint, \
 226                       writeable) \
 227                                                                             \
 228   lp64_product(bool, UseCompressedOops, false,                              \
 229           "Use 32-bit object references in 64-bit VM. "                     \
 230           "lp64_product means flag is always constant in 32 bit VM")        \
 231                                                                             \
 232   lp64_product(bool, UseCompressedClassPointers, false,                     \
 233           "Use 32-bit class pointers in 64-bit VM. "                        \
 234           "lp64_product means flag is always constant in 32 bit VM")        \
 235                                                                             \
 236   notproduct(bool, CheckCompressedOops, true,                               \
 237           "Generate checks in encoding/decoding code in debug VM")          \
 238                                                                             \
 239   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 240           "Heap allocation steps through preferred address regions to find" \
 241           " where it can allocate the heap. Number of steps to take per "   \
 242           "region.")                                                        \
 243           range(1, max_uintx)                                               \
 244                                                                             \
 245   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 246           "Default object alignment in bytes, 8 is minimum")                \
 247           range(8, 256)                                                     \
 248           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 249                                                                             \
 250   product(bool, AssumeMP, true,                                             \
 251           "(Deprecated) Instruct the VM to assume multiple processors are available")\
 252                                                                             \
 253   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 254   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 255   /* been re-added (see 6401008)                                         */ \
 256   NOT_AARCH32(                                                              \
 257   product_pd(bool, UseMembar,                                               \
 258           "(Unstable) Issues membars on thread state transitions"))         \
 259                                                                             \
 260   develop(bool, CleanChunkPoolAsync, true,                                  \
 261           "Clean the chunk pool asynchronously")                            \
 262                                                                             \
 263   product_pd(bool, ThreadLocalHandshakes,                                   \
 264           "Use thread-local polls instead of global poll for safepoints.")  \
 265           constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo)         \
 266                                                                             \
 267   diagnostic(uint, HandshakeTimeout, 0,                                     \
 268           "If nonzero set a timeout in milliseconds for handshakes")        \
 269                                                                             \
 270   experimental(bool, AlwaysSafeConstructors, false,                         \
 271           "Force safe construction, as if all fields are final.")           \
 272                                                                             \
 273   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 274           "Enable normal processing of flags relating to field diagnostics")\
 275                                                                             \
 276   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 277           "Enable normal processing of flags relating to experimental "     \
 278           "features")                                                       \
 279                                                                             \
 280   product(bool, JavaMonitorsInStackTrace, true,                             \
 281           "Print information about Java monitor locks when the stacks are"  \
 282           "dumped")                                                         \
 283                                                                             \
 284   product_pd(bool, UseLargePages,                                           \
 285           "Use large page memory")                                          \
 286                                                                             \
 287   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 288           "Allocate large pages individually for better affinity")          \
 289                                                                             \
 290   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 291           "Fail large pages individual allocation")                         \
 292                                                                             \
 293   product(bool, UseLargePagesInMetaspace, false,                            \
 294           "Use large page memory in metaspace. "                            \
 295           "Only used if UseLargePages is enabled.")                         \
 296                                                                             \
 297   product(bool, UseNUMA, false,                                             \
 298           "Use NUMA if available")                                          \
 299                                                                             \
 300   product(bool, UseNUMAInterleaving, false,                                 \
 301           "Interleave memory across NUMA nodes if available")               \
 302                                                                             \
 303   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 304           "Granularity to use for NUMA interleaving on Windows OS")         \
 305           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 306                                                                             \
 307   product(bool, ForceNUMA, false,                                           \
 308           "Force NUMA optimizations on single-node/UMA systems")            \
 309                                                                             \
 310   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 311           "Percentage (0-100) used to weight the current sample when "      \
 312           "computing exponentially decaying average for "                   \
 313           "AdaptiveNUMAChunkSizing")                                        \
 314           range(0, 100)                                                     \
 315                                                                             \
 316   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 317           "Do not reallocate more than this amount per collection")         \
 318           range(0, max_uintx)                                               \
 319                                                                             \
 320   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 321           "Enable adaptive chunk sizing for NUMA")                          \
 322                                                                             \
 323   product(bool, NUMAStats, false,                                           \
 324           "Print NUMA stats in detailed heap information")                  \
 325                                                                             \
 326   product(uintx, NUMAPageScanRate, 256,                                     \
 327           "Maximum number of pages to include in the page scan procedure")  \
 328           range(0, max_uintx)                                               \
 329                                                                             \
 330   product_pd(bool, NeedsDeoptSuspend,                                       \
 331           "True for register window machines (sparc/ia64)")                 \
 332                                                                             \
 333   product(intx, UseSSE, 99,                                                 \
 334           "Highest supported SSE instructions set on x86/x64")              \
 335           range(0, 99)                                                      \
 336                                                                             \
 337   product(bool, UseAES, false,                                              \
 338           "Control whether AES instructions are used when available")       \
 339                                                                             \
 340   product(bool, UseFMA, false,                                              \
 341           "Control whether FMA instructions are used when available")       \
 342                                                                             \
 343   product(bool, UseSHA, false,                                              \
 344           "Control whether SHA instructions are used when available")       \
 345                                                                             \
 346   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 347           "Use intrinsics for GHASH versions of crypto")                    \
 348                                                                             \
 349   product(bool, UseBASE64Intrinsics, false,                                 \
 350           "Use intrinsics for java.util.Base64")                            \
 351                                                                             \
 352   product(size_t, LargePageSizeInBytes, 0,                                  \
 353           "Large page size (0 to let VM choose the page size)")             \
 354           range(0, max_uintx)                                               \
 355                                                                             \
 356   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 357           "Use large pages if maximum heap is at least this big")           \
 358           range(0, max_uintx)                                               \
 359                                                                             \
 360   product(bool, ForceTimeHighResolution, false,                             \
 361           "Using high time resolution (for Win32 only)")                    \
 362                                                                             \
 363   develop(bool, TracePcPatching, false,                                     \
 364           "Trace usage of frame::patch_pc")                                 \
 365                                                                             \
 366   develop(bool, TraceRelocator, false,                                      \
 367           "Trace the bytecode relocator")                                   \
 368                                                                             \
 369   develop(bool, TraceLongCompiles, false,                                   \
 370           "Print out every time compilation is longer than "                \
 371           "a given threshold")                                              \
 372                                                                             \
 373   develop(bool, SafepointALot, false,                                       \
 374           "Generate a lot of safepoints. This works with "                  \
 375           "GuaranteedSafepointInterval")                                    \
 376                                                                             \
 377   product_pd(bool, BackgroundCompilation,                                   \
 378           "A thread requesting compilation is not blocked during "          \
 379           "compilation")                                                    \
 380                                                                             \
 381   product(bool, PrintVMQWaitTime, false,                                    \
 382           "Print out the waiting time in VM operation queue")               \
 383                                                                             \
 384   product(bool, MethodFlushing, true,                                       \
 385           "Reclamation of zombie and not-entrant methods")                  \
 386                                                                             \
 387   develop(bool, VerifyStack, false,                                         \
 388           "Verify stack of each thread when it is entering a runtime call") \
 389                                                                             \
 390   diagnostic(bool, ForceUnreachable, false,                                 \
 391           "Make all non code cache addresses to be unreachable by "         \
 392           "forcing use of 64bit literal fixups")                            \
 393                                                                             \
 394   notproduct(bool, StressDerivedPointers, false,                            \
 395           "Force scavenge when a derived pointer is detected on stack "     \
 396           "after rtm call")                                                 \
 397                                                                             \
 398   develop(bool, TraceDerivedPointers, false,                                \
 399           "Trace traversal of derived pointers on stack")                   \
 400                                                                             \
 401   notproduct(bool, TraceCodeBlobStacks, false,                              \
 402           "Trace stack-walk of codeblobs")                                  \
 403                                                                             \
 404   product(bool, PrintJNIResolving, false,                                   \
 405           "Used to implement -v:jni")                                       \
 406                                                                             \
 407   notproduct(bool, PrintRewrites, false,                                    \
 408           "Print methods that are being rewritten")                         \
 409                                                                             \
 410   product(bool, UseInlineCaches, true,                                      \
 411           "Use Inline Caches for virtual calls ")                           \
 412                                                                             \
 413   diagnostic(bool, InlineArrayCopy, true,                                   \
 414           "Inline arraycopy native that is known to be part of "            \
 415           "base library DLL")                                               \
 416                                                                             \
 417   diagnostic(bool, InlineObjectHash, true,                                  \
 418           "Inline Object::hashCode() native that is known to be part "      \
 419           "of base library DLL")                                            \
 420                                                                             \
 421   diagnostic(bool, InlineNatives, true,                                     \
 422           "Inline natives that are known to be part of base library DLL")   \
 423                                                                             \
 424   diagnostic(bool, InlineMathNatives, true,                                 \
 425           "Inline SinD, CosD, etc.")                                        \
 426                                                                             \
 427   diagnostic(bool, InlineClassNatives, true,                                \
 428           "Inline Class.isInstance, etc")                                   \
 429                                                                             \
 430   diagnostic(bool, InlineThreadNatives, true,                               \
 431           "Inline Thread.currentThread, etc")                               \
 432                                                                             \
 433   diagnostic(bool, InlineUnsafeOps, true,                                   \
 434           "Inline memory ops (native methods) from Unsafe")                 \
 435                                                                             \
 436   product(bool, CriticalJNINatives, true,                                   \
 437           "Check for critical JNI entry points")                            \
 438                                                                             \
 439   notproduct(bool, StressCriticalJNINatives, false,                         \
 440           "Exercise register saving code in critical natives")              \
 441                                                                             \
 442   diagnostic(bool, UseAESIntrinsics, false,                                 \
 443           "Use intrinsics for AES versions of crypto")                      \
 444                                                                             \
 445   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 446           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 447                                                                             \
 448   AARCH32_ONLY(diagnostic(bool, UseMontgomeryMultiplyIntrinsic, false,      \
 449           "Enables intrinsification of BigInteger.montgomeryMultiply()"))   \
 450                                                                             \
 451   AARCH32_ONLY(diagnostic(bool, UseMontgomerySquareIntrinsic, false,        \
 452           "Enables intrinsification of BigInteger.montgomerySquare()"))     \
 453                                                                             \
 454   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 455           "Use intrinsics for SHA-1 crypto hash function. "                 \
 456           "Requires that UseSHA is enabled.")                               \
 457                                                                             \
 458   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 459           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 460           "Requires that UseSHA is enabled.")                               \
 461                                                                             \
 462   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 463           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 464           "Requires that UseSHA is enabled.")                               \
 465                                                                             \
 466   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 467           "use intrinsics for java.util.zip.CRC32")                         \
 468                                                                             \
 469   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 470           "use intrinsics for java.util.zip.CRC32C")                        \
 471                                                                             \
 472   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 473           "use intrinsics for java.util.zip.Adler32")                       \
 474                                                                             \
 475   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 476           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 477                                                                             \
 478   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 479          "do not expand intrinsics whose (internal) names appear here")     \
 480                                                                             \
 481   develop(bool, TraceCallFixup, false,                                      \
 482           "Trace all call fixups")                                          \
 483                                                                             \
 484   develop(bool, DeoptimizeALot, false,                                      \
 485           "Deoptimize at every exit from the runtime system")               \
 486                                                                             \
 487   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 488           "A comma separated list of bcis to deoptimize at")                \
 489                                                                             \
 490   product(bool, DeoptimizeRandom, false,                                    \
 491           "Deoptimize random frames on random exit from the runtime system")\
 492                                                                             \
 493   notproduct(bool, ZombieALot, false,                                       \
 494           "Create zombies (non-entrant) at exit from the runtime system")   \
 495                                                                             \
 496   product(bool, UnlinkSymbolsALot, false,                                   \
 497           "Unlink unreferenced symbols from the symbol table at safepoints")\
 498                                                                             \
 499   notproduct(bool, WalkStackALot, false,                                    \
 500           "Trace stack (no print) at every exit from the runtime system")   \
 501                                                                             \
 502   product(bool, Debugging, false,                                           \
 503           "Set when executing debug methods in debug.cpp "                  \
 504           "(to prevent triggering assertions)")                             \
 505                                                                             \
 506   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 507           "Enable strict checks that safepoints cannot happen for threads " \
 508           "that use NoSafepointVerifier")                                   \
 509                                                                             \
 510   notproduct(bool, VerifyLastFrame, false,                                  \
 511           "Verify oops on last frame on entry to VM")                       \
 512                                                                             \
 513   product(bool, FailOverToOldVerifier, true,                                \
 514           "Fail over to old verifier when split verifier fails")            \
 515                                                                             \
 516   product(bool, SafepointTimeout, false,                                    \
 517           "Time out and warn or fail after SafepointTimeoutDelay "          \
 518           "milliseconds if failed to reach safepoint")                      \
 519                                                                             \
 520   develop(bool, DieOnSafepointTimeout, false,                               \
 521           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 522                                                                             \
 523   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 524   /* typically, at most a few retries are needed                    */      \
 525   product(intx, SuspendRetryCount, 50,                                      \
 526           "Maximum retry count for an external suspend request")            \
 527           range(0, max_intx)                                                \
 528                                                                             \
 529   product(intx, SuspendRetryDelay, 5,                                       \
 530           "Milliseconds to delay per retry (* current_retry_count)")        \
 531           range(0, max_intx)                                                \
 532                                                                             \
 533   product(bool, AssertOnSuspendWaitFailure, false,                          \
 534           "Assert/Guarantee on external suspend wait failure")              \
 535                                                                             \
 536   product(bool, TraceSuspendWaitFailures, false,                            \
 537           "Trace external suspend wait failures")                           \
 538                                                                             \
 539   product(bool, MaxFDLimit, true,                                           \
 540           "Bump the number of file descriptors to maximum in Solaris")      \
 541                                                                             \
 542   diagnostic(bool, LogEvents, true,                                         \
 543           "Enable the various ring buffer event logs")                      \
 544                                                                             \
 545   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 546           "Number of ring buffer event logs")                               \
 547           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 548                                                                             \
 549   product(bool, BytecodeVerificationRemote, true,                           \
 550           "Enable the Java bytecode verifier for remote classes")           \
 551                                                                             \
 552   product(bool, BytecodeVerificationLocal, false,                           \
 553           "Enable the Java bytecode verifier for local classes")            \
 554                                                                             \
 555   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 556           "Force exceptions on FP stack under/overflow")                    \
 557                                                                             \
 558   develop(bool, VerifyStackAtCalls, false,                                  \
 559           "Verify that the stack pointer is unchanged after calls")         \
 560                                                                             \
 561   develop(bool, TraceJavaAssertions, false,                                 \
 562           "Trace java language assertions")                                 \
 563                                                                             \
 564   notproduct(bool, VerifyCodeCache, false,                                  \
 565           "Verify code cache on memory allocation/deallocation")            \
 566                                                                             \
 567   develop(bool, UseMallocOnly, false,                                       \
 568           "Use only malloc/free for allocation (no resource area/arena)")   \
 569                                                                             \
 570   develop(bool, PrintMallocStatistics, false,                               \
 571           "Print malloc/free statistics")                                   \
 572                                                                             \
 573   develop(bool, ZapResourceArea, trueInDebug,                               \
 574           "Zap freed resource/arena space with 0xABABABAB")                 \
 575                                                                             \
 576   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 577           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 578                                                                             \
 579   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 580           "Zap allocated/freed stack segments with 0xFADFADED")             \
 581                                                                             \
 582   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 583           "Zap unused heap space with 0xBAADBABE")                          \
 584                                                                             \
 585   develop(bool, CheckZapUnusedHeapArea, false,                              \
 586           "Check zapping of unused heap space")                             \
 587                                                                             \
 588   develop(bool, ZapFillerObjects, trueInDebug,                              \
 589           "Zap filler objects with 0xDEAFBABE")                             \
 590                                                                             \
 591   develop(bool, PrintVMMessages, true,                                      \
 592           "Print VM messages on console")                                   \
 593                                                                             \
 594   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 595           "If > 0, provokes an error after VM initialization; the value "   \
 596           "determines which error to provoke. See test_error_handler() "    \
 597           "in vmError.cpp.")                                                \
 598                                                                             \
 599   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 600           "If > 0, provokes an error inside VM error handler (a secondary " \
 601           "crash). see test_error_handler() in vmError.cpp")                \
 602                                                                             \
 603   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 604           "If true, tests SafeFetch inside error handler.")                 \
 605                                                                             \
 606   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 607           "If true, simulates an unresponsive error handler.")              \
 608                                                                             \
 609   develop(bool, Verbose, false,                                             \
 610           "Print additional debugging information from other modes")        \
 611                                                                             \
 612   develop(bool, PrintMiscellaneous, false,                                  \
 613           "Print uncategorized debugging information (requires +Verbose)")  \
 614                                                                             \
 615   develop(bool, WizardMode, false,                                          \
 616           "Print much more debugging information")                          \
 617                                                                             \
 618   product(bool, ShowMessageBoxOnError, false,                               \
 619           "Keep process alive on VM fatal error")                           \
 620                                                                             \
 621   product(bool, CreateCoredumpOnCrash, true,                                \
 622           "Create core/mini dump on VM fatal error")                        \
 623                                                                             \
 624   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 625           "Timeout, in seconds, to limit the time spent on writing an "     \
 626           "error log in case of a crash.")                                  \
 627           range(0, (uint64_t)max_jlong/1000)                                \
 628                                                                             \
 629   product_pd(bool, UseOSErrorReporting,                                     \
 630           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 631                                                                             \
 632   product(bool, SuppressFatalErrorMessage, false,                           \
 633           "Report NO fatal error message (avoid deadlock)")                 \
 634                                                                             \
 635   product(ccstrlist, OnError, "",                                           \
 636           "Run user-defined commands on fatal error; see VMError.cpp "      \
 637           "for examples")                                                   \
 638                                                                             \
 639   product(ccstrlist, OnOutOfMemoryError, "",                                \
 640           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 641                                                                             \
 642   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 643           "Dump heap to file before any major stop-the-world GC")           \
 644                                                                             \
 645   manageable(bool, HeapDumpAfterFullGC, false,                              \
 646           "Dump heap to file after any major stop-the-world GC")            \
 647                                                                             \
 648   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 649           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 650                                                                             \
 651   manageable(ccstr, HeapDumpPath, NULL,                                     \
 652           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 653           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 654           "in the working directory)")                                      \
 655                                                                             \
 656   develop(bool, BreakAtWarning, false,                                      \
 657           "Execute breakpoint upon encountering VM warning")                \
 658                                                                             \
 659   develop(bool, UseFakeTimers, false,                                       \
 660           "Tell whether the VM should use system time or a fake timer")     \
 661                                                                             \
 662   product(ccstr, NativeMemoryTracking, "off",                               \
 663           "Native memory tracking options")                                 \
 664                                                                             \
 665   diagnostic(bool, PrintNMTStatistics, false,                               \
 666           "Print native memory tracking summary data if it is on")          \
 667                                                                             \
 668   diagnostic(bool, LogCompilation, false,                                   \
 669           "Log compilation activity in detail to LogFile")                  \
 670                                                                             \
 671   product(bool, PrintCompilation, false,                                    \
 672           "Print compilations")                                             \
 673                                                                             \
 674   product(bool, PrintExtendedThreadInfo, false,                             \
 675           "Print more information in thread dump")                          \
 676                                                                             \
 677   diagnostic(bool, TraceNMethodInstalls, false,                             \
 678           "Trace nmethod installation")                                     \
 679                                                                             \
 680   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 681           "0: do not allow scavengable oops in the code cache; "            \
 682           "1: allow scavenging from the code cache; "                       \
 683           "2: emit as many constants as the compiler can see")              \
 684           range(0, 2)                                                       \
 685                                                                             \
 686   product(bool, AlwaysRestoreFPU, false,                                    \
 687           "Restore the FPU control word after every JNI call (expensive)")  \
 688                                                                             \
 689   diagnostic(bool, PrintCompilation2, false,                                \
 690           "Print additional statistics per compilation")                    \
 691                                                                             \
 692   diagnostic(bool, PrintAdapterHandlers, false,                             \
 693           "Print code generated for i2c/c2i adapters")                      \
 694                                                                             \
 695   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 696           "Verify that i2c/c2i adapters are called properly")               \
 697                                                                             \
 698   develop(bool, VerifyAdapterSharing, false,                                \
 699           "Verify that the code for shared adapters is the equivalent")     \
 700                                                                             \
 701   diagnostic(bool, PrintAssembly, false,                                    \
 702           "Print assembly code (using external disassembler.so)")           \
 703                                                                             \
 704   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 705           "Print options string passed to disassembler.so")                 \
 706                                                                             \
 707   notproduct(bool, PrintNMethodStatistics, false,                           \
 708           "Print a summary statistic for the generated nmethods")           \
 709                                                                             \
 710   diagnostic(bool, PrintNMethods, false,                                    \
 711           "Print assembly code for nmethods when generated")                \
 712                                                                             \
 713   diagnostic(bool, PrintNativeNMethods, false,                              \
 714           "Print assembly code for native nmethods when generated")         \
 715                                                                             \
 716   develop(bool, PrintDebugInfo, false,                                      \
 717           "Print debug information for all nmethods when generated")        \
 718                                                                             \
 719   develop(bool, PrintRelocations, false,                                    \
 720           "Print relocation information for all nmethods when generated")   \
 721                                                                             \
 722   develop(bool, PrintDependencies, false,                                   \
 723           "Print dependency information for all nmethods when generated")   \
 724                                                                             \
 725   develop(bool, PrintExceptionHandlers, false,                              \
 726           "Print exception handler tables for all nmethods when generated") \
 727                                                                             \
 728   develop(bool, StressCompiledExceptionHandlers, false,                     \
 729           "Exercise compiled exception handlers")                           \
 730                                                                             \
 731   develop(bool, InterceptOSException, false,                                \
 732           "Start debugger when an implicit OS (e.g. NULL) "                 \
 733           "exception happens")                                              \
 734                                                                             \
 735   product(bool, PrintCodeCache, false,                                      \
 736           "Print the code cache memory usage when exiting")                 \
 737                                                                             \
 738   develop(bool, PrintCodeCache2, false,                                     \
 739           "Print detailed usage information on the code cache when exiting")\
 740                                                                             \
 741   product(bool, PrintCodeCacheOnCompilation, false,                         \
 742           "Print the code cache memory usage each time a method is "        \
 743           "compiled")                                                       \
 744                                                                             \
 745   diagnostic(bool, PrintStubCode, false,                                    \
 746           "Print generated stub code")                                      \
 747                                                                             \
 748   product(bool, StackTraceInThrowable, true,                                \
 749           "Collect backtrace in throwable when exception happens")          \
 750                                                                             \
 751   product(bool, OmitStackTraceInFastThrow, true,                            \
 752           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 753                                                                             \
 754   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 755           "Print bytecode statistics when dumping profiler output")         \
 756                                                                             \
 757   product(bool, ProfilerRecordPC, false,                                    \
 758           "Collect ticks for each 16 byte interval of compiled code")       \
 759                                                                             \
 760   product(bool, ProfileVM, false,                                           \
 761           "Profile ticks that fall within VM (either in the VM Thread "     \
 762           "or VM code called through stubs)")                               \
 763                                                                             \
 764   product(bool, ProfileIntervals, false,                                    \
 765           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
 766                                                                             \
 767   notproduct(bool, ProfilerCheckIntervals, false,                           \
 768           "Collect and print information on spacing of profiler ticks")     \
 769                                                                             \
 770   product(bool, PrintWarnings, true,                                        \
 771           "Print JVM warnings to output stream")                            \
 772                                                                             \
 773   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 774           "Print warnings for stalled SpinLocks")                           \
 775                                                                             \
 776   product(bool, RegisterFinalizersAtInit, true,                             \
 777           "Register finalizable objects at end of Object.<init> or "        \
 778           "after allocation")                                               \
 779                                                                             \
 780   develop(bool, RegisterReferences, true,                                   \
 781           "Tell whether the VM should register soft/weak/final/phantom "    \
 782           "references")                                                     \
 783                                                                             \
 784   develop(bool, IgnoreRewrites, false,                                      \
 785           "Suppress rewrites of bytecodes in the oopmap generator. "        \
 786           "This is unsafe!")                                                \
 787                                                                             \
 788   develop(bool, PrintCodeCacheExtension, false,                             \
 789           "Print extension of code cache")                                  \
 790                                                                             \
 791   develop(bool, UsePrivilegedStack, true,                                   \
 792           "Enable the security JVM functions")                              \
 793                                                                             \
 794   develop(bool, ProtectionDomainVerification, true,                         \
 795           "Verify protection domain before resolution in system dictionary")\
 796                                                                             \
 797   product(bool, ClassUnloading, true,                                       \
 798           "Do unloading of classes")                                        \
 799                                                                             \
 800   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
 801           "Do unloading of classes with a concurrent marking cycle")        \
 802                                                                             \
 803   develop(bool, DisableStartThread, false,                                  \
 804           "Disable starting of additional Java threads "                    \
 805           "(for debugging only)")                                           \
 806                                                                             \
 807   develop(bool, MemProfiling, false,                                        \
 808           "Write memory usage profiling to log file")                       \
 809                                                                             \
 810   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 811           "Print the system dictionary at exit")                            \
 812                                                                             \
 813   diagnostic(bool, DynamicallyResizeSystemDictionaries, true,               \
 814           "Dynamically resize system dictionaries as needed")               \
 815                                                                             \
 816   product(bool, AlwaysLockClassLoader, false,                               \
 817           "Require the VM to acquire the class loader lock before calling " \
 818           "loadClass() even for class loaders registering "                 \
 819           "as parallel capable")                                            \
 820                                                                             \
 821   product(bool, AllowParallelDefineClass, false,                            \
 822           "Allow parallel defineClass requests for class loaders "          \
 823           "registering as parallel capable")                                \
 824                                                                             \
 825   product_pd(bool, DontYieldALot,                                           \
 826           "Throw away obvious excess yield calls")                          \
 827                                                                             \
 828   develop(bool, UseDetachedThreads, true,                                   \
 829           "Use detached threads that are recycled upon termination "        \
 830           "(for Solaris only)")                                             \
 831                                                                             \
 832   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
 833                "Disable the use of stack guard pages if the JVM is loaded " \
 834                "on the primordial process thread")                          \
 835                                                                             \
 836   product(bool, UseLWPSynchronization, true,                                \
 837           "Use LWP-based instead of libthread-based synchronization "       \
 838           "(SPARC only)")                                                   \
 839                                                                             \
 840   experimental(ccstr, SyncKnobs, NULL,                                      \
 841                "(Unstable) Various monitor synchronization tunables")       \
 842                                                                             \
 843   experimental(intx, EmitSync, 0,                                           \
 844                "(Unsafe, Unstable) "                                        \
 845                "Control emission of inline sync fast-path code")            \
 846                                                                             \
 847   product(intx, MonitorBound, 0, "Bound Monitor population")                \
 848           range(0, max_jint)                                                \
 849                                                                             \
 850   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
 851                                                                             \
 852   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
 853                 "Percentage of used monitors before triggering cleanup "    \
 854                 "safepoint which deflates monitors (0 is off). "            \
 855                 "The check is performed on GuaranteedSafepointInterval.")   \
 856                 range(0, 100)                                               \
 857                                                                             \
 858   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
 859                "Experimental Sync flags")                                   \
 860                                                                             \
 861   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
 862                                                                             \
 863   experimental(intx, hashCode, 5,                                           \
 864                "(Unstable) select hashCode generation algorithm")           \
 865                                                                             \
 866   product(bool, FilterSpuriousWakeups, true,                                \
 867           "When true prevents OS-level spurious, or premature, wakeups "    \
 868           "from Object.wait (Ignored for Windows)")                         \
 869                                                                             \
 870   develop(bool, UsePthreads, false,                                         \
 871           "Use pthread-based instead of libthread-based synchronization "   \
 872           "(SPARC only)")                                                   \
 873                                                                             \
 874   product(bool, ReduceSignalUsage, false,                                   \
 875           "Reduce the use of OS signals in Java and/or the VM")             \
 876                                                                             \
 877   develop_pd(bool, ShareVtableStubs,                                        \
 878           "Share vtable stubs (smaller code but worse branch prediction")   \
 879                                                                             \
 880   develop(bool, LoadLineNumberTables, true,                                 \
 881           "Tell whether the class file parser loads line number tables")    \
 882                                                                             \
 883   develop(bool, LoadLocalVariableTables, true,                              \
 884           "Tell whether the class file parser loads local variable tables") \
 885                                                                             \
 886   develop(bool, LoadLocalVariableTypeTables, true,                          \
 887           "Tell whether the class file parser loads local variable type"    \
 888           "tables")                                                         \
 889                                                                             \
 890   product(bool, AllowUserSignalHandlers, false,                             \
 891           "Do not complain if the application installs signal handlers "    \
 892           "(Solaris & Linux only)")                                         \
 893                                                                             \
 894   product(bool, UseSignalChaining, true,                                    \
 895           "Use signal-chaining to invoke signal handlers installed "        \
 896           "by the application (Solaris & Linux only)")                      \
 897                                                                             \
 898   product(bool, AllowJNIEnvProxy, false,                                    \
 899           "Allow JNIEnv proxies for jdbx")                                  \
 900                                                                             \
 901   product(bool, RestoreMXCSROnJNICalls, false,                              \
 902           "Restore MXCSR when returning from JNI calls")                    \
 903                                                                             \
 904   product(bool, CheckJNICalls, false,                                       \
 905           "Verify all arguments to JNI calls")                              \
 906                                                                             \
 907   product(bool, UseFastJNIAccessors, true,                                  \
 908           "Use optimized versions of Get<Primitive>Field")                  \
 909                                                                             \
 910   product(intx, MaxJNILocalCapacity, 65536,                                 \
 911           "Maximum allowable local JNI handle capacity to "                 \
 912           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
 913           "where <= 0 is unlimited, default: 65536")                        \
 914           range(min_intx, max_intx)                                         \
 915                                                                             \
 916   product(bool, EagerXrunInit, false,                                       \
 917           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 918           "but not all -Xrun libraries may support the state of the VM "    \
 919           "at this time")                                                   \
 920                                                                             \
 921   product(bool, PreserveAllAnnotations, false,                              \
 922           "Preserve RuntimeInvisibleAnnotations as well "                   \
 923           "as RuntimeVisibleAnnotations")                                   \
 924                                                                             \
 925   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 926           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 927                                                                             \
 928   product(bool, UseXMMForArrayCopy, false,                                  \
 929           "Use SSE2 MOVQ instruction for Arraycopy")                        \
 930                                                                             \
 931   product(intx, FieldsAllocationStyle, 1,                                   \
 932           "0 - type based with oops first, "                                \
 933           "1 - with oops last, "                                            \
 934           "2 - oops in super and sub classes are together")                 \
 935           range(0, 2)                                                       \
 936                                                                             \
 937   product(bool, CompactFields, true,                                        \
 938           "Allocate nonstatic fields in gaps between previous fields")      \
 939                                                                             \
 940   notproduct(bool, PrintFieldLayout, false,                                 \
 941           "Print field layout for each class")                              \
 942                                                                             \
 943   /* Need to limit the extent of the padding to reasonable size.          */\
 944   /* 8K is well beyond the reasonable HW cache line size, even with       */\
 945   /* aggressive prefetching, while still leaving the room for segregating */\
 946   /* among the distinct pages.                                            */\
 947   product(intx, ContendedPaddingWidth, 128,                                 \
 948           "How many bytes to pad the fields/classes marked @Contended with")\
 949           range(0, 8192)                                                    \
 950           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
 951                                                                             \
 952   product(bool, EnableContended, true,                                      \
 953           "Enable @Contended annotation support")                           \
 954                                                                             \
 955   product(bool, RestrictContended, true,                                    \
 956           "Restrict @Contended to trusted classes")                         \
 957                                                                             \
 958   product(bool, UseBiasedLocking, true,                                     \
 959           "Enable biased locking in JVM")                                   \
 960                                                                             \
 961   product(intx, BiasedLockingStartupDelay, 0,                               \
 962           "Number of milliseconds to wait before enabling biased locking")  \
 963           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
 964           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
 965                                                                             \
 966   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
 967           "Print statistics of biased locking in JVM")                      \
 968                                                                             \
 969   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
 970           "Threshold of number of revocations per type to try to "          \
 971           "rebias all objects in the heap of that type")                    \
 972           range(0, max_intx)                                                \
 973           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
 974                                                                             \
 975   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
 976           "Threshold of number of revocations per type to permanently "     \
 977           "revoke biases of all objects in the heap of that type")          \
 978           range(0, max_intx)                                                \
 979           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
 980                                                                             \
 981   product(intx, BiasedLockingDecayTime, 25000,                              \
 982           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
 983           "type after previous bulk rebias")                                \
 984           range(500, max_intx)                                              \
 985           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
 986                                                                             \
 987   product(bool, ExitOnOutOfMemoryError, false,                              \
 988           "JVM exits on the first occurrence of an out-of-memory error")    \
 989                                                                             \
 990   product(bool, CrashOnOutOfMemoryError, false,                             \
 991           "JVM aborts, producing an error log and core/mini dump, on the "  \
 992           "first occurrence of an out-of-memory error")                     \
 993                                                                             \
 994   /* tracing */                                                             \
 995                                                                             \
 996   develop(bool, StressRewriter, false,                                      \
 997           "Stress linktime bytecode rewriting")                             \
 998                                                                             \
 999   product(ccstr, TraceJVMTI, NULL,                                          \
1000           "Trace flags for JVMTI functions and events")                     \
1001                                                                             \
1002   /* This option can change an EMCP method into an obsolete method. */      \
1003   /* This can affect tests that except specific methods to be EMCP. */      \
1004   /* This option should be used with caution.                       */      \
1005   product(bool, StressLdcRewrite, false,                                    \
1006           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1007                                                                             \
1008   /* change to false by default sometime after Mustang */                   \
1009   product(bool, VerifyMergedCPBytecodes, true,                              \
1010           "Verify bytecodes after RedefineClasses constant pool merging")   \
1011                                                                             \
1012   develop(bool, TraceBytecodes, false,                                      \
1013           "Trace bytecode execution")                                       \
1014                                                                             \
1015   develop(bool, TraceICs, false,                                            \
1016           "Trace inline cache changes")                                     \
1017                                                                             \
1018   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1019           "Trace method invocation counter overflow")                       \
1020                                                                             \
1021   develop(bool, TraceInlineCacheClearing, false,                            \
1022           "Trace clearing of inline caches in nmethods")                    \
1023                                                                             \
1024   develop(bool, TraceDependencies, false,                                   \
1025           "Trace dependencies")                                             \
1026                                                                             \
1027   develop(bool, VerifyDependencies, trueInDebug,                            \
1028           "Exercise and verify the compilation dependency mechanism")       \
1029                                                                             \
1030   develop(bool, TraceNewOopMapGeneration, false,                            \
1031           "Trace OopMapGeneration")                                         \
1032                                                                             \
1033   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1034           "Trace OopMapGeneration: print detailed cell states")             \
1035                                                                             \
1036   develop(bool, TimeOopMap, false,                                          \
1037           "Time calls to GenerateOopMap::compute_map() in sum")             \
1038                                                                             \
1039   develop(bool, TimeOopMap2, false,                                         \
1040           "Time calls to GenerateOopMap::compute_map() individually")       \
1041                                                                             \
1042   develop(bool, TraceOopMapRewrites, false,                                 \
1043           "Trace rewriting of method oops during oop map generation")       \
1044                                                                             \
1045   develop(bool, TraceICBuffer, false,                                       \
1046           "Trace usage of IC buffer")                                       \
1047                                                                             \
1048   develop(bool, TraceCompiledIC, false,                                     \
1049           "Trace changes of compiled IC")                                   \
1050                                                                             \
1051   develop(bool, FLSVerifyDictionary, false,                                 \
1052           "Do lots of (expensive) FLS dictionary verification")             \
1053                                                                             \
1054                                                                             \
1055   notproduct(bool, CheckMemoryInitialization, false,                        \
1056           "Check memory initialization")                                    \
1057                                                                             \
1058   product(uintx, ProcessDistributionStride, 4,                              \
1059           "Stride through processors when distributing processes")          \
1060           range(0, max_juint)                                               \
1061                                                                             \
1062   develop(bool, TraceFinalizerRegistration, false,                          \
1063           "Trace registration of final references")                         \
1064                                                                             \
1065   product(bool, IgnoreEmptyClassPaths, false,                               \
1066           "Ignore empty path elements in -classpath")                       \
1067                                                                             \
1068   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
1069           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
1070           "Initial size of the boot class loader data metaspace")           \
1071           range(30*K, max_uintx/BytesPerWord)                               \
1072           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
1073                                                                             \
1074   product(bool, PrintHeapAtSIGBREAK, true,                                  \
1075           "Print heap layout in response to SIGBREAK")                      \
1076                                                                             \
1077   manageable(bool, PrintClassHistogram, false,                              \
1078           "Print a histogram of class instances")                           \
1079                                                                             \
1080   develop(bool, IgnoreLibthreadGPFault, false,                              \
1081           "Suppress workaround for libthread GP fault")                     \
1082                                                                             \
1083   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
1084           "The percentage of the used heap that the instances of a class "  \
1085           "must occupy for the class to generate a trace event")            \
1086           range(0.0, 100.0)                                                 \
1087                                                                             \
1088   /* JVMTI heap profiling */                                                \
1089                                                                             \
1090   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
1091           "Trace JVMTI object tagging calls")                               \
1092                                                                             \
1093   diagnostic(bool, VerifyBeforeIteration, false,                            \
1094           "Verify memory system before JVMTI iteration")                    \
1095                                                                             \
1096   /* compiler interface */                                                  \
1097                                                                             \
1098   develop(bool, CIPrintCompilerName, false,                                 \
1099           "when CIPrint is active, print the name of the active compiler")  \
1100                                                                             \
1101   diagnostic(bool, CIPrintCompileQueue, false,                              \
1102           "display the contents of the compile queue whenever a "           \
1103           "compilation is enqueued")                                        \
1104                                                                             \
1105   develop(bool, CIPrintRequests, false,                                     \
1106           "display every request for compilation")                          \
1107                                                                             \
1108   product(bool, CITime, false,                                              \
1109           "collect timing information for compilation")                     \
1110                                                                             \
1111   develop(bool, CITimeVerbose, false,                                       \
1112           "be more verbose in compilation timings")                         \
1113                                                                             \
1114   develop(bool, CITimeEach, false,                                          \
1115           "display timing information after each successful compilation")   \
1116                                                                             \
1117   develop(bool, CICountOSR, false,                                          \
1118           "use a separate counter when assigning ids to osr compilations")  \
1119                                                                             \
1120   develop(bool, CICompileNatives, true,                                     \
1121           "compile native methods if supported by the compiler")            \
1122                                                                             \
1123   develop_pd(bool, CICompileOSR,                                            \
1124           "compile on stack replacement methods if supported by the "       \
1125           "compiler")                                                       \
1126                                                                             \
1127   develop(bool, CIPrintMethodCodes, false,                                  \
1128           "print method bytecodes of the compiled code")                    \
1129                                                                             \
1130   develop(bool, CIPrintTypeFlow, false,                                     \
1131           "print the results of ciTypeFlow analysis")                       \
1132                                                                             \
1133   develop(bool, CITraceTypeFlow, false,                                     \
1134           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
1135                                                                             \
1136   develop(intx, OSROnlyBCI, -1,                                             \
1137           "OSR only at this bci.  Negative values mean exclude that bci")   \
1138                                                                             \
1139   /* compiler */                                                            \
1140                                                                             \
1141   /* notice: the max range value here is max_jint, not max_intx  */         \
1142   /* because of overflow issue                                   */         \
1143   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
1144           "Number of compiler threads to run")                              \
1145           range(0, max_jint)                                                \
1146           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
1147                                                                             \
1148   product(bool, UseDynamicNumberOfCompilerThreads, true,                    \
1149           "Dynamically choose the number of parallel compiler threads")     \
1150                                                                             \
1151   diagnostic(bool, ReduceNumberOfCompilerThreads, true,                     \
1152              "Reduce the number of parallel compiler threads when they "    \
1153              "are not used")                                                \
1154                                                                             \
1155   diagnostic(bool, TraceCompilerThreads, false,                             \
1156              "Trace creation and removal of compiler threads")              \
1157                                                                             \
1158   develop(bool, InjectCompilerCreationFailure, false,                       \
1159           "Inject thread creation failures for "                            \
1160           "UseDynamicNumberOfCompilerThreads")                              \
1161                                                                             \
1162   product(intx, CompilationPolicyChoice, 0,                                 \
1163           "which compilation policy (0-2)")                                 \
1164           range(0, 2)                                                       \
1165                                                                             \
1166   develop(bool, UseStackBanging, true,                                      \
1167           "use stack banging for stack overflow checks (required for "      \
1168           "proper StackOverflow handling; disable only to measure cost "    \
1169           "of stackbanging)")                                               \
1170                                                                             \
1171   develop(bool, UseStrictFP, true,                                          \
1172           "use strict fp if modifier strictfp is set")                      \
1173                                                                             \
1174   develop(bool, GenerateSynchronizationCode, true,                          \
1175           "generate locking/unlocking code for synchronized methods and "   \
1176           "monitors")                                                       \
1177                                                                             \
1178   develop(bool, GenerateRangeChecks, true,                                  \
1179           "Generate range checks for array accesses")                       \
1180                                                                             \
1181   diagnostic_pd(bool, ImplicitNullChecks,                                   \
1182           "Generate code for implicit null checks")                         \
1183                                                                             \
1184   product_pd(bool, TrapBasedNullChecks,                                     \
1185           "Generate code for null checks that uses a cmp and trap "         \
1186           "instruction raising SIGTRAP.  This is only used if an access to" \
1187           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
1188           "ImplicitNullChecks don't work (PPC64).")                         \
1189                                                                             \
1190   product(bool, PrintSafepointStatistics, false,                            \
1191           "(Deprecated) Print statistics about safepoint synchronization")  \
1192                                                                             \
1193   product(intx, PrintSafepointStatisticsCount, 300,                         \
1194           "(Deprecated) Total number of safepoint statistics collected "    \
1195           "before printing them out")                                       \
1196           range(1, max_intx)                                                \
1197                                                                             \
1198   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
1199           "(Deprecated) Print safepoint statistics only when safepoint takes "  \
1200           "more than PrintSafepointSatisticsTimeout in millis")             \
1201   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
1202   NOT_LP64(range(-1, max_intx))                                             \
1203                                                                             \
1204   diagnostic(bool, EnableThreadSMRExtraValidityChecks, true,                \
1205              "Enable Thread SMR extra validity checks")                     \
1206                                                                             \
1207   diagnostic(bool, EnableThreadSMRStatistics, trueInDebug,                  \
1208              "Enable Thread SMR Statistics")                                \
1209                                                                             \
1210   product(bool, Inline, true,                                               \
1211           "Enable inlining")                                                \
1212                                                                             \
1213   product(bool, ClipInlining, true,                                         \
1214           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
1215                                                                             \
1216   develop(bool, UseCHA, true,                                               \
1217           "Enable CHA")                                                     \
1218                                                                             \
1219   product(bool, UseTypeProfile, true,                                       \
1220           "Check interpreter profile for historically monomorphic calls")   \
1221                                                                             \
1222   diagnostic(bool, PrintInlining, false,                                    \
1223           "Print inlining optimizations")                                   \
1224                                                                             \
1225   product(bool, UsePopCountInstruction, false,                              \
1226           "Use population count instruction")                               \
1227                                                                             \
1228   develop(bool, EagerInitialization, false,                                 \
1229           "Eagerly initialize classes if possible")                         \
1230                                                                             \
1231   diagnostic(bool, LogTouchedMethods, false,                                \
1232           "Log methods which have been ever touched in runtime")            \
1233                                                                             \
1234   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
1235           "Print all methods that have been ever touched in runtime")       \
1236                                                                             \
1237   develop(bool, TraceMethodReplacement, false,                              \
1238           "Print when methods are replaced do to recompilation")            \
1239                                                                             \
1240   develop(bool, PrintMethodFlushing, false,                                 \
1241           "Print the nmethods being flushed")                               \
1242                                                                             \
1243   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
1244           "print statistics about method flushing")                         \
1245                                                                             \
1246   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
1247           "Number of compiled code invocations after which "                \
1248           "the method is considered as hot by the flusher")                 \
1249           range(1, max_jint)                                                \
1250                                                                             \
1251   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
1252           "Minimum number of sweeper passes before an nmethod "             \
1253           "can be flushed")                                                 \
1254           range(0, max_intx)                                                \
1255                                                                             \
1256   product(bool, UseCodeAging, true,                                         \
1257           "Insert counter to detect warm methods")                          \
1258                                                                             \
1259   diagnostic(bool, StressCodeAging, false,                                  \
1260           "Start with counters compiled in")                                \
1261                                                                             \
1262   develop(bool, StressCodeBuffers, false,                                   \
1263           "Exercise code buffer expansion and other rare state changes")    \
1264                                                                             \
1265   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
1266           "Generate extra debugging information for non-safepoints in "     \
1267           "nmethods")                                                       \
1268                                                                             \
1269   product(bool, PrintVMOptions, false,                                      \
1270           "Print flags that appeared on the command line")                  \
1271                                                                             \
1272   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
1273           "Ignore unrecognized VM options")                                 \
1274                                                                             \
1275   product(bool, PrintCommandLineFlags, false,                               \
1276           "Print flags specified on command line or set by ergonomics")     \
1277                                                                             \
1278   product(bool, PrintFlagsInitial, false,                                   \
1279           "Print all VM flags before argument processing and exit VM")      \
1280                                                                             \
1281   product(bool, PrintFlagsFinal, false,                                     \
1282           "Print all VM flags after argument and ergonomic processing")     \
1283                                                                             \
1284   notproduct(bool, PrintFlagsWithComments, false,                           \
1285           "Print all VM flags with default values and descriptions and "    \
1286           "exit")                                                           \
1287                                                                             \
1288   product(bool, PrintFlagsRanges, false,                                    \
1289           "Print VM flags and their ranges and exit VM")                    \
1290                                                                             \
1291   diagnostic(bool, SerializeVMOutput, true,                                 \
1292           "Use a mutex to serialize output to tty and LogFile")             \
1293                                                                             \
1294   diagnostic(bool, DisplayVMOutput, true,                                   \
1295           "Display all VM output on the tty, independently of LogVMOutput") \
1296                                                                             \
1297   diagnostic(bool, LogVMOutput, false,                                      \
1298           "Save VM output to LogFile")                                      \
1299                                                                             \
1300   diagnostic(ccstr, LogFile, NULL,                                          \
1301           "If LogVMOutput or LogCompilation is on, save VM output to "      \
1302           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1303                                                                             \
1304   product(ccstr, ErrorFile, NULL,                                           \
1305           "If an error occurs, save the error data to this file "           \
1306           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
1307                                                                             \
1308   product(bool, DisplayVMOutputToStderr, false,                             \
1309           "If DisplayVMOutput is true, display all VM output to stderr")    \
1310                                                                             \
1311   product(bool, DisplayVMOutputToStdout, false,                             \
1312           "If DisplayVMOutput is true, display all VM output to stdout")    \
1313                                                                             \
1314   product(bool, UseHeavyMonitors, false,                                    \
1315           "use heavyweight instead of lightweight Java monitors")           \
1316                                                                             \
1317   product(bool, PrintStringTableStatistics, false,                          \
1318           "print statistics about the StringTable and SymbolTable")         \
1319                                                                             \
1320   diagnostic(bool, VerifyStringTableAtExit, false,                          \
1321           "verify StringTable contents at exit")                            \
1322                                                                             \
1323   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
1324           "print histogram of the symbol table")                            \
1325                                                                             \
1326   notproduct(bool, ExitVMOnVerifyError, false,                              \
1327           "standard exit from VM if bytecode verify error "                 \
1328           "(only in debug mode)")                                           \
1329                                                                             \
1330   diagnostic(ccstr, AbortVMOnException, NULL,                               \
1331           "Call fatal if this exception is thrown.  Example: "              \
1332           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1333                                                                             \
1334   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
1335           "Call fatal if the exception pointed by AbortVMOnException "      \
1336           "has this message")                                               \
1337                                                                             \
1338   develop(bool, DebugVtables, false,                                        \
1339           "add debugging code to vtable dispatch")                          \
1340                                                                             \
1341   notproduct(bool, PrintVtableStats, false,                                 \
1342           "print vtables stats at end of run")                              \
1343                                                                             \
1344   develop(bool, TraceCreateZombies, false,                                  \
1345           "trace creation of zombie nmethods")                              \
1346                                                                             \
1347   notproduct(bool, IgnoreLockingAssertions, false,                          \
1348           "disable locking assertions (for speed)")                         \
1349                                                                             \
1350   product(bool, RangeCheckElimination, true,                                \
1351           "Eliminate range checks")                                         \
1352                                                                             \
1353   develop_pd(bool, UncommonNullCast,                                        \
1354           "track occurrences of null in casts; adjust compiler tactics")    \
1355                                                                             \
1356   develop(bool, TypeProfileCasts,  true,                                    \
1357           "treat casts like calls for purposes of type profiling")          \
1358                                                                             \
1359   develop(bool, DelayCompilationDuringStartup, true,                        \
1360           "Delay invoking the compiler until main application class is "    \
1361           "loaded")                                                         \
1362                                                                             \
1363   develop(bool, CompileTheWorld, false,                                     \
1364           "Compile all methods in all classes in bootstrap class path "     \
1365             "(stress test)")                                                \
1366                                                                             \
1367   develop(bool, CompileTheWorldPreloadClasses, true,                        \
1368           "Preload all classes used by a class before start loading")       \
1369                                                                             \
1370   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
1371           "Force a safepoint every n compiles so sweeper can keep up")      \
1372                                                                             \
1373   develop(bool, FillDelaySlots, true,                                       \
1374           "Fill delay slots (on SPARC only)")                               \
1375                                                                             \
1376   develop(bool, TimeLivenessAnalysis, false,                                \
1377           "Time computation of bytecode liveness analysis")                 \
1378                                                                             \
1379   develop(bool, TraceLivenessGen, false,                                    \
1380           "Trace the generation of liveness analysis information")          \
1381                                                                             \
1382   notproduct(bool, TraceLivenessQuery, false,                               \
1383           "Trace queries of liveness analysis information")                 \
1384                                                                             \
1385   notproduct(bool, CollectIndexSetStatistics, false,                        \
1386           "Collect information about IndexSets")                            \
1387                                                                             \
1388   develop(bool, UseLoopSafepoints, true,                                    \
1389           "Generate Safepoint nodes in every loop")                         \
1390                                                                             \
1391   develop(intx, FastAllocateSizeLimit, 128*K,                               \
1392           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
1393           "Inline allocations larger than this in doublewords must go slow")\
1394                                                                             \
1395   product(bool, AggressiveOpts, false,                                      \
1396           "(Deprecated) Enable aggressive optimizations - see arguments.cpp") \
1397                                                                             \
1398   product_pd(bool, CompactStrings,                                          \
1399           "Enable Strings to use single byte chars in backing store")       \
1400                                                                             \
1401   product_pd(uintx, TypeProfileLevel,                                       \
1402           "=XYZ, with Z: Type profiling of arguments at call; "             \
1403                      "Y: Type profiling of return value at call; "          \
1404                      "X: Type profiling of parameters to methods; "         \
1405           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
1406           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
1407                                                                             \
1408   product(intx, TypeProfileArgsLimit,     2,                                \
1409           "max number of call arguments to consider for type profiling")    \
1410           range(0, 16)                                                      \
1411                                                                             \
1412   product(intx, TypeProfileParmsLimit,    2,                                \
1413           "max number of incoming parameters to consider for type profiling"\
1414           ", -1 for all")                                                   \
1415           range(-1, 64)                                                     \
1416                                                                             \
1417   /* statistics */                                                          \
1418   develop(bool, CountCompiledCalls, false,                                  \
1419           "Count method invocations")                                       \
1420                                                                             \
1421   notproduct(bool, CountRuntimeCalls, false,                                \
1422           "Count VM runtime calls")                                         \
1423                                                                             \
1424   develop(bool, CountJNICalls, false,                                       \
1425           "Count jni method invocations")                                   \
1426                                                                             \
1427   notproduct(bool, CountJVMCalls, false,                                    \
1428           "Count jvm method invocations")                                   \
1429                                                                             \
1430   notproduct(bool, CountRemovableExceptions, false,                         \
1431           "Count exceptions that could be replaced by branches due to "     \
1432           "inlining")                                                       \
1433                                                                             \
1434   notproduct(bool, ICMissHistogram, false,                                  \
1435           "Produce histogram of IC misses")                                 \
1436                                                                             \
1437   /* interpreter */                                                         \
1438   product_pd(bool, RewriteBytecodes,                                        \
1439           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
1440                                                                             \
1441   product_pd(bool, RewriteFrequentPairs,                                    \
1442           "Rewrite frequently used bytecode pairs into a single bytecode")  \
1443                                                                             \
1444   diagnostic(bool, PrintInterpreter, false,                                 \
1445           "Print the generated interpreter code")                           \
1446                                                                             \
1447   product(bool, UseInterpreter, true,                                       \
1448           "Use interpreter for non-compiled methods")                       \
1449                                                                             \
1450   develop(bool, UseFastSignatureHandlers, true,                             \
1451           "Use fast signature handlers for native calls")                   \
1452                                                                             \
1453   product(bool, UseLoopCounter, true,                                       \
1454           "Increment invocation counter on backward branch")                \
1455                                                                             \
1456   product_pd(bool, UseOnStackReplacement,                                   \
1457           "Use on stack replacement, calls runtime if invoc. counter "      \
1458           "overflows in loop")                                              \
1459                                                                             \
1460   notproduct(bool, TraceOnStackReplacement, false,                          \
1461           "Trace on stack replacement")                                     \
1462                                                                             \
1463   product_pd(bool, PreferInterpreterNativeStubs,                            \
1464           "Use always interpreter stubs for native methods invoked via "    \
1465           "interpreter")                                                    \
1466                                                                             \
1467   develop(bool, CountBytecodes, false,                                      \
1468           "Count number of bytecodes executed")                             \
1469                                                                             \
1470   develop(bool, PrintBytecodeHistogram, false,                              \
1471           "Print histogram of the executed bytecodes")                      \
1472                                                                             \
1473   develop(bool, PrintBytecodePairHistogram, false,                          \
1474           "Print histogram of the executed bytecode pairs")                 \
1475                                                                             \
1476   diagnostic(bool, PrintSignatureHandlers, false,                           \
1477           "Print code generated for native method signature handlers")      \
1478                                                                             \
1479   develop(bool, VerifyOops, false,                                          \
1480           "Do plausibility checks for oops")                                \
1481                                                                             \
1482   develop(bool, CheckUnhandledOops, false,                                  \
1483           "Check for unhandled oops in VM code")                            \
1484                                                                             \
1485   develop(bool, VerifyJNIFields, trueInDebug,                               \
1486           "Verify jfieldIDs for instance fields")                           \
1487                                                                             \
1488   notproduct(bool, VerifyJNIEnvThread, false,                               \
1489           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
1490           "from JNI")                                                       \
1491                                                                             \
1492   develop(bool, VerifyFPU, false,                                           \
1493           "Verify FPU state (check for NaN's, etc.)")                       \
1494                                                                             \
1495   develop(bool, VerifyThread, false,                                        \
1496           "Watch the thread register for corruption (SPARC only)")          \
1497                                                                             \
1498   develop(bool, VerifyActivationFrameSize, false,                           \
1499           "Verify that activation frame didn't become smaller than its "    \
1500           "minimal size")                                                   \
1501                                                                             \
1502   develop(bool, TraceFrequencyInlining, false,                              \
1503           "Trace frequency based inlining")                                 \
1504                                                                             \
1505   develop_pd(bool, InlineIntrinsics,                                        \
1506           "Inline intrinsics that can be statically resolved")              \
1507                                                                             \
1508   product_pd(bool, ProfileInterpreter,                                      \
1509           "Profile at the bytecode level during interpretation")            \
1510                                                                             \
1511   develop(bool, TraceProfileInterpreter, false,                             \
1512           "Trace profiling at the bytecode level during interpretation. "   \
1513           "This outputs the profiling information collected to improve "    \
1514           "jit compilation.")                                               \
1515                                                                             \
1516   develop_pd(bool, ProfileTraps,                                            \
1517           "Profile deoptimization traps at the bytecode level")             \
1518                                                                             \
1519   product(intx, ProfileMaturityPercentage, 20,                              \
1520           "number of method invocations/branches (expressed as % of "       \
1521           "CompileThreshold) before using the method's profile")            \
1522           range(0, 100)                                                     \
1523                                                                             \
1524   diagnostic(bool, PrintMethodData, false,                                  \
1525           "Print the results of +ProfileInterpreter at end of run")         \
1526                                                                             \
1527   develop(bool, VerifyDataPointer, trueInDebug,                             \
1528           "Verify the method data pointer during interpreter profiling")    \
1529                                                                             \
1530   develop(bool, VerifyCompiledCode, false,                                  \
1531           "Include miscellaneous runtime verifications in nmethod code; "   \
1532           "default off because it disturbs nmethod size heuristics")        \
1533                                                                             \
1534   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
1535           "Manually make GC thread crash then dump java stack trace;  "     \
1536           "Test only")                                                      \
1537                                                                             \
1538   /* compilation */                                                         \
1539   product(bool, UseCompiler, true,                                          \
1540           "Use Just-In-Time compilation")                                   \
1541                                                                             \
1542   develop(bool, TraceCompilationPolicy, false,                              \
1543           "Trace compilation policy")                                       \
1544                                                                             \
1545   develop(bool, TimeCompilationPolicy, false,                               \
1546           "Time the compilation policy")                                    \
1547                                                                             \
1548   product(bool, UseCounterDecay, true,                                      \
1549           "Adjust recompilation counters")                                  \
1550                                                                             \
1551   develop(intx, CounterHalfLifeTime,    30,                                 \
1552           "Half-life time of invocation counters (in seconds)")             \
1553                                                                             \
1554   develop(intx, CounterDecayMinIntervalLength,   500,                       \
1555           "The minimum interval (in milliseconds) between invocation of "   \
1556           "CounterDecay")                                                   \
1557                                                                             \
1558   product(bool, AlwaysCompileLoopMethods, false,                            \
1559           "When using recompilation, never interpret methods "              \
1560           "containing loops")                                               \
1561                                                                             \
1562   product(bool, DontCompileHugeMethods, true,                               \
1563           "Do not compile methods > HugeMethodLimit")                       \
1564                                                                             \
1565   /* Bytecode escape analysis estimation. */                                \
1566   product(bool, EstimateArgEscape, true,                                    \
1567           "Analyze bytecodes to estimate escape state of arguments")        \
1568                                                                             \
1569   product(intx, BCEATraceLevel, 0,                                          \
1570           "How much tracing to do of bytecode escape analysis estimates "   \
1571           "(0-3)")                                                          \
1572           range(0, 3)                                                       \
1573                                                                             \
1574   product(intx, MaxBCEAEstimateLevel, 5,                                    \
1575           "Maximum number of nested calls that are analyzed by BC EA")      \
1576           range(0, max_jint)                                                \
1577                                                                             \
1578   product(intx, MaxBCEAEstimateSize, 150,                                   \
1579           "Maximum bytecode size of a method to be analyzed by BC EA")      \
1580           range(0, max_jint)                                                \
1581                                                                             \
1582   product(intx,  AllocatePrefetchStyle, 1,                                  \
1583           "0 = no prefetch, "                                               \
1584           "1 = generate prefetch instructions for each allocation, "        \
1585           "2 = use TLAB watermark to gate allocation prefetch, "            \
1586           "3 = generate one prefetch instruction per cache line")           \
1587           range(0, 3)                                                       \
1588                                                                             \
1589   product(intx,  AllocatePrefetchDistance, -1,                              \
1590           "Distance to prefetch ahead of allocation pointer. "              \
1591           "-1: use system-specific value (automatically determined")        \
1592           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
1593                                                                             \
1594   product(intx,  AllocatePrefetchLines, 3,                                  \
1595           "Number of lines to prefetch ahead of array allocation pointer")  \
1596           range(1, 64)                                                      \
1597                                                                             \
1598   product(intx,  AllocateInstancePrefetchLines, 1,                          \
1599           "Number of lines to prefetch ahead of instance allocation "       \
1600           "pointer")                                                        \
1601           range(1, 64)                                                      \
1602                                                                             \
1603   product(intx,  AllocatePrefetchStepSize, 16,                              \
1604           "Step size in bytes of sequential prefetch instructions")         \
1605           range(1, 512)                                                     \
1606           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1607                                                                             \
1608   product(intx,  AllocatePrefetchInstr, 0,                                  \
1609           "Select instruction to prefetch ahead of allocation pointer")     \
1610           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
1611                                                                             \
1612   /* deoptimization */                                                      \
1613   develop(bool, TraceDeoptimization, false,                                 \
1614           "Trace deoptimization")                                           \
1615                                                                             \
1616   develop(bool, PrintDeoptimizationDetails, false,                          \
1617           "Print more information about deoptimization")                    \
1618                                                                             \
1619   develop(bool, DebugDeoptimization, false,                                 \
1620           "Tracing various information while debugging deoptimization")     \
1621                                                                             \
1622   product(intx, SelfDestructTimer, 0,                                       \
1623           "Will cause VM to terminate after a given time (in minutes) "     \
1624           "(0 means off)")                                                  \
1625           range(0, max_intx)                                                \
1626                                                                             \
1627   product(intx, MaxJavaStackTraceDepth, 1024,                               \
1628           "The maximum number of lines in the stack trace for Java "        \
1629           "exceptions (0 means all)")                                       \
1630           range(0, max_jint/2)                                              \
1631                                                                             \
1632   /* notice: the max range value here is max_jint, not max_intx  */         \
1633   /* because of overflow issue                                   */         \
1634   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
1635           "Guarantee a safepoint (at least) every so many milliseconds "    \
1636           "(0 means none)")                                                 \
1637           range(0, max_jint)                                                \
1638                                                                             \
1639   product(intx, SafepointTimeoutDelay, 10000,                               \
1640           "Delay in milliseconds for option SafepointTimeout")              \
1641   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
1642   NOT_LP64(range(0, max_intx))                                              \
1643                                                                             \
1644   product(intx, NmethodSweepActivity, 10,                                   \
1645           "Removes cold nmethods from code cache if > 0. Higher values "    \
1646           "result in more aggressive sweeping")                             \
1647           range(0, 2000)                                                    \
1648                                                                             \
1649   notproduct(bool, LogSweeper, false,                                       \
1650           "Keep a ring buffer of sweeper activity")                         \
1651                                                                             \
1652   notproduct(intx, SweeperLogEntries, 1024,                                 \
1653           "Number of records in the ring buffer of sweeper activity")       \
1654                                                                             \
1655   notproduct(intx, MemProfilingInterval, 500,                               \
1656           "Time between each invocation of the MemProfiler")                \
1657                                                                             \
1658   develop(intx, MallocCatchPtr, -1,                                         \
1659           "Hit breakpoint when mallocing/freeing this pointer")             \
1660                                                                             \
1661   notproduct(ccstrlist, SuppressErrorAt, "",                                \
1662           "List of assertions (file:line) to muzzle")                       \
1663                                                                             \
1664   develop(intx, StackPrintLimit, 100,                                       \
1665           "number of stack frames to print in VM-level stack dump")         \
1666                                                                             \
1667   notproduct(intx, MaxElementPrintSize, 256,                                \
1668           "maximum number of elements to print")                            \
1669                                                                             \
1670   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
1671           "maximum number of subklasses to print when printing klass")      \
1672                                                                             \
1673   product(intx, MaxInlineLevel, 9,                                          \
1674           "maximum number of nested calls that are inlined")                \
1675           range(0, max_jint)                                                \
1676                                                                             \
1677   product(intx, MaxRecursiveInlineLevel, 1,                                 \
1678           "maximum number of nested recursive calls that are inlined")      \
1679           range(0, max_jint)                                                \
1680                                                                             \
1681   develop(intx, MaxForceInlineLevel, 100,                                   \
1682           "maximum number of nested calls that are forced for inlining "    \
1683           "(using CompileCommand or marked w/ @ForceInline)")               \
1684           range(0, max_jint)                                                \
1685                                                                             \
1686   product_pd(intx, InlineSmallCode,                                         \
1687           "Only inline already compiled methods if their code size is "     \
1688           "less than this")                                                 \
1689           range(0, max_jint)                                                \
1690                                                                             \
1691   product(intx, MaxInlineSize, 35,                                          \
1692           "The maximum bytecode size of a method to be inlined")            \
1693           range(0, max_jint)                                                \
1694                                                                             \
1695   product_pd(intx, FreqInlineSize,                                          \
1696           "The maximum bytecode size of a frequent method to be inlined")   \
1697           range(0, max_jint)                                                \
1698                                                                             \
1699   product(intx, MaxTrivialSize, 6,                                          \
1700           "The maximum bytecode size of a trivial method to be inlined")    \
1701           range(0, max_jint)                                                \
1702                                                                             \
1703   product(intx, MinInliningThreshold, 250,                                  \
1704           "The minimum invocation count a method needs to have to be "      \
1705           "inlined")                                                        \
1706           range(0, max_jint)                                                \
1707                                                                             \
1708   develop(intx, MethodHistogramCutoff, 100,                                 \
1709           "The cutoff value for method invocation histogram (+CountCalls)") \
1710                                                                             \
1711   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
1712           "Number of interpreted methods to show in profile")               \
1713                                                                             \
1714   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
1715           "Number of compiled methods to show in profile")                  \
1716                                                                             \
1717   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
1718           "Number of stub methods to show in profile")                      \
1719                                                                             \
1720   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
1721           "Number of runtime stub nodes to show in profile")                \
1722                                                                             \
1723   product(intx, ProfileIntervalsTicks, 100,                                 \
1724           "Number of ticks between printing of interval profile "           \
1725           "(+ProfileIntervals)")                                            \
1726           range(0, max_intx)                                                \
1727                                                                             \
1728   develop(intx, DontYieldALotInterval,    10,                               \
1729           "Interval between which yields will be dropped (milliseconds)")   \
1730                                                                             \
1731   develop(intx, ProfilerPCTickThreshold,    15,                             \
1732           "Number of ticks in a PC buckets to be a hotspot")                \
1733                                                                             \
1734   notproduct(intx, DeoptimizeALotInterval,     5,                           \
1735           "Number of exits until DeoptimizeALot kicks in")                  \
1736                                                                             \
1737   notproduct(intx, ZombieALotInterval,     5,                               \
1738           "Number of exits until ZombieALot kicks in")                      \
1739                                                                             \
1740   diagnostic(uintx, MallocMaxTestWords,     0,                              \
1741           "If non-zero, maximum number of words that malloc/realloc can "   \
1742           "allocate (for testing only)")                                    \
1743           range(0, max_uintx)                                               \
1744                                                                             \
1745   product(intx, TypeProfileWidth, 2,                                        \
1746           "Number of receiver types to record in call/cast profile")        \
1747           range(0, 8)                                                       \
1748                                                                             \
1749   develop(intx, BciProfileWidth,      2,                                    \
1750           "Number of return bci's to record in ret profile")                \
1751                                                                             \
1752   product(intx, PerMethodRecompilationCutoff, 400,                          \
1753           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1754           range(-1, max_intx)                                               \
1755                                                                             \
1756   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
1757           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
1758           range(-1, max_intx)                                               \
1759                                                                             \
1760   product(intx, PerMethodTrapLimit,  100,                                   \
1761           "Limit on traps (of one kind) in a method (includes inlines)")    \
1762           range(0, max_jint)                                                \
1763                                                                             \
1764   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
1765           "Limit on speculative traps (of one kind) in a method "           \
1766           "(includes inlines)")                                             \
1767           range(0, max_jint)                                                \
1768                                                                             \
1769   product(intx, PerBytecodeTrapLimit,  4,                                   \
1770           "Limit on traps (of one kind) at a particular BCI")               \
1771           range(0, max_jint)                                                \
1772                                                                             \
1773   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
1774           "Extra method data trap entries for speculation")                 \
1775                                                                             \
1776   develop(intx, InlineFrequencyRatio,    20,                                \
1777           "Ratio of call site execution to caller method invocation")       \
1778           range(0, max_jint)                                                \
1779                                                                             \
1780   diagnostic_pd(intx, InlineFrequencyCount,                                 \
1781           "Count of call site execution necessary to trigger frequent "     \
1782           "inlining")                                                       \
1783           range(0, max_jint)                                                \
1784                                                                             \
1785   develop(intx, InlineThrowCount,    50,                                    \
1786           "Force inlining of interpreted methods that throw this often")    \
1787           range(0, max_jint)                                                \
1788                                                                             \
1789   develop(intx, InlineThrowMaxSize,   200,                                  \
1790           "Force inlining of throwing methods smaller than this")           \
1791           range(0, max_jint)                                                \
1792                                                                             \
1793   develop(intx, ProfilerNodeSize,  1024,                                    \
1794           "Size in K to allocate for the Profile Nodes of each thread")     \
1795           range(0, 1024)                                                    \
1796                                                                             \
1797   product_pd(size_t, MetaspaceSize,                                         \
1798           "Initial threshold (in bytes) at which a garbage collection "     \
1799           "is done to reduce Metaspace usage")                              \
1800           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
1801                                                                             \
1802   product(size_t, MaxMetaspaceSize, max_uintx,                              \
1803           "Maximum size of Metaspaces (in bytes)")                          \
1804           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
1805                                                                             \
1806   product(size_t, CompressedClassSpaceSize, 1*G,                            \
1807           "Maximum size of class area in Metaspace when compressed "        \
1808           "class pointers are used")                                        \
1809           range(1*M, 3*G)                                                   \
1810                                                                             \
1811   manageable(uintx, MinHeapFreeRatio, 40,                                   \
1812           "The minimum percentage of heap free after GC to avoid expansion."\
1813           " For most GCs this applies to the old generation. In G1 and"     \
1814           " ParallelGC it applies to the whole heap.")                      \
1815           range(0, 100)                                                     \
1816           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
1817                                                                             \
1818   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
1819           "The maximum percentage of heap free after GC to avoid shrinking."\
1820           " For most GCs this applies to the old generation. In G1 and"     \
1821           " ParallelGC it applies to the whole heap.")                      \
1822           range(0, 100)                                                     \
1823           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
1824                                                                             \
1825   product(bool, ShrinkHeapInSteps, true,                                    \
1826           "When disabled, informs the GC to shrink the java heap directly"  \
1827           " to the target size at the next full GC rather than requiring"   \
1828           " smaller steps during multiple full GCs.")                       \
1829                                                                             \
1830   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
1831           "Number of milliseconds per MB of free space in the heap")        \
1832           range(0, max_intx)                                                \
1833           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1834                                                                             \
1835   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
1836           "The minimum change in heap space due to GC (in bytes)")          \
1837           range(0, max_uintx)                                               \
1838                                                                             \
1839   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
1840           "The minimum expansion of Metaspace (in bytes)")                  \
1841           range(0, max_uintx)                                               \
1842                                                                             \
1843   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
1844           "The maximum percentage of Metaspace free after GC to avoid "     \
1845           "shrinking")                                                      \
1846           range(0, 100)                                                     \
1847           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1848                                                                             \
1849   product(uintx, MinMetaspaceFreeRatio,    40,                              \
1850           "The minimum percentage of Metaspace free after GC to avoid "     \
1851           "expansion")                                                      \
1852           range(0, 99)                                                      \
1853           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1854                                                                             \
1855   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
1856           "The maximum expansion of Metaspace without full GC (in bytes)")  \
1857           range(0, max_uintx)                                               \
1858                                                                             \
1859   /* stack parameters */                                                    \
1860   product_pd(intx, StackYellowPages,                                        \
1861           "Number of yellow zone (recoverable overflows) pages of size "    \
1862           "4KB. If pages are bigger yellow zone is aligned up.")            \
1863           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
1864                                                                             \
1865   product_pd(intx, StackRedPages,                                           \
1866           "Number of red zone (unrecoverable overflows) pages of size "     \
1867           "4KB. If pages are bigger red zone is aligned up.")               \
1868           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
1869                                                                             \
1870   product_pd(intx, StackReservedPages,                                      \
1871           "Number of reserved zone (reserved to annotated methods) pages"   \
1872           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1873           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1874                                                                             \
1875   product(bool, RestrictReservedStack, true,                                \
1876           "Restrict @ReservedStackAccess to trusted classes")               \
1877                                                                             \
1878   /* greater stack shadow pages can't generate instruction to bang stack */ \
1879   product_pd(intx, StackShadowPages,                                        \
1880           "Number of shadow zone (for overflow checking) pages of size "    \
1881           "4KB. If pages are bigger shadow zone is aligned up. "            \
1882           "This should exceed the depth of the VM and native call stack.")  \
1883           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
1884                                                                             \
1885   product_pd(intx, ThreadStackSize,                                         \
1886           "Thread Stack Size (in Kbytes)")                                  \
1887           range(0, 1 * M)                                                   \
1888                                                                             \
1889   product_pd(intx, VMThreadStackSize,                                       \
1890           "Non-Java Thread Stack Size (in Kbytes)")                         \
1891           range(0, max_intx/(1 * K))                                        \
1892                                                                             \
1893   product_pd(intx, CompilerThreadStackSize,                                 \
1894           "Compiler Thread Stack Size (in Kbytes)")                         \
1895           range(0, max_intx/(1 * K))                                        \
1896                                                                             \
1897   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
1898           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
1899                                                                             \
1900   /* code cache parameters                                    */            \
1901   develop_pd(uintx, CodeCacheSegmentSize,                                   \
1902           "Code cache segment size (in bytes) - smallest unit of "          \
1903           "allocation")                                                     \
1904           range(1, 1024)                                                    \
1905           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
1906                                                                             \
1907   develop_pd(intx, CodeEntryAlignment,                                      \
1908           "Code entry alignment for generated code (in bytes)")             \
1909           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
1910                                                                             \
1911   product_pd(intx, OptoLoopAlignment,                                       \
1912           "Align inner loops to zero relative to this modulus")             \
1913           range(1, 16)                                                      \
1914           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
1915                                                                             \
1916   product_pd(uintx, InitialCodeCacheSize,                                   \
1917           "Initial code cache size (in bytes)")                             \
1918           range(os::vm_page_size(), max_uintx)                              \
1919                                                                             \
1920   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
1921           "Minimum code cache size (in bytes) required to start VM.")       \
1922           range(0, max_uintx)                                               \
1923                                                                             \
1924   product(bool, SegmentedCodeCache, false,                                  \
1925           "Use a segmented code cache")                                     \
1926                                                                             \
1927   product_pd(uintx, ReservedCodeCacheSize,                                  \
1928           "Reserved code cache size (in bytes) - maximum code cache size")  \
1929           range(os::vm_page_size(), max_uintx)                              \
1930                                                                             \
1931   product_pd(uintx, NonProfiledCodeHeapSize,                                \
1932           "Size of code heap with non-profiled methods (in bytes)")         \
1933           range(0, max_uintx)                                               \
1934                                                                             \
1935   product_pd(uintx, ProfiledCodeHeapSize,                                   \
1936           "Size of code heap with profiled methods (in bytes)")             \
1937           range(0, max_uintx)                                               \
1938                                                                             \
1939   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
1940           "Size of code heap with non-nmethods (in bytes)")                 \
1941           range(os::vm_page_size(), max_uintx)                              \
1942                                                                             \
1943   product_pd(uintx, CodeCacheExpansionSize,                                 \
1944           "Code cache expansion size (in bytes)")                           \
1945           range(32*K, max_uintx)                                            \
1946                                                                             \
1947   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
1948           "Minimum number of segments in a code cache block")               \
1949           range(1, 100)                                                     \
1950                                                                             \
1951   notproduct(bool, ExitOnFullCodeCache, false,                              \
1952           "Exit the VM if we fill the code cache")                          \
1953                                                                             \
1954   product(bool, UseCodeCacheFlushing, true,                                 \
1955           "Remove cold/old nmethods from the code cache")                   \
1956                                                                             \
1957   product(uintx, StartAggressiveSweepingAt, 10,                             \
1958           "Start aggressive sweeping if X[%] of the code cache is free."    \
1959           "Segmented code cache: X[%] of the non-profiled heap."            \
1960           "Non-segmented code cache: X[%] of the total code cache")         \
1961           range(0, 100)                                                     \
1962                                                                             \
1963   /* AOT parameters */                                                      \
1964   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
1965           "Use AOT compiled files")                                         \
1966                                                                             \
1967   product(ccstrlist, AOTLibrary, NULL,                                      \
1968           "AOT library")                                                    \
1969                                                                             \
1970   product(bool, PrintAOT, false,                                            \
1971           "Print used AOT klasses and methods")                             \
1972                                                                             \
1973   notproduct(bool, PrintAOTStatistics, false,                               \
1974           "Print AOT statistics")                                           \
1975                                                                             \
1976   diagnostic(bool, UseAOTStrictLoading, false,                              \
1977           "Exit the VM if any of the AOT libraries has invalid config")     \
1978                                                                             \
1979   product(bool, CalculateClassFingerprint, false,                           \
1980           "Calculate class fingerprint")                                    \
1981                                                                             \
1982   /* interpreter debugging */                                               \
1983   develop(intx, BinarySwitchThreshold, 5,                                   \
1984           "Minimal number of lookupswitch entries for rewriting to binary " \
1985           "switch")                                                         \
1986                                                                             \
1987   develop(intx, StopInterpreterAt, 0,                                       \
1988           "Stop interpreter execution at specified bytecode number")        \
1989                                                                             \
1990   develop(intx, TraceBytecodesAt, 0,                                        \
1991           "Trace bytecodes starting with specified bytecode number")        \
1992                                                                             \
1993   /* compiler interface */                                                  \
1994   develop(intx, CIStart, 0,                                                 \
1995           "The id of the first compilation to permit")                      \
1996                                                                             \
1997   develop(intx, CIStop, max_jint,                                           \
1998           "The id of the last compilation to permit")                       \
1999                                                                             \
2000   develop(intx, CIStartOSR, 0,                                              \
2001           "The id of the first osr compilation to permit "                  \
2002           "(CICountOSR must be on)")                                        \
2003                                                                             \
2004   develop(intx, CIStopOSR, max_jint,                                        \
2005           "The id of the last osr compilation to permit "                   \
2006           "(CICountOSR must be on)")                                        \
2007                                                                             \
2008   develop(intx, CIBreakAtOSR, -1,                                           \
2009           "The id of osr compilation to break at")                          \
2010                                                                             \
2011   develop(intx, CIBreakAt, -1,                                              \
2012           "The id of compilation to break at")                              \
2013                                                                             \
2014   product(ccstrlist, CompileOnly, "",                                       \
2015           "List of methods (pkg/class.name) to restrict compilation to")    \
2016                                                                             \
2017   product(ccstr, CompileCommandFile, NULL,                                  \
2018           "Read compiler commands from this file [.hotspot_compiler]")      \
2019                                                                             \
2020   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
2021           "Read compiler directives from this file")                        \
2022                                                                             \
2023   product(ccstrlist, CompileCommand, "",                                    \
2024           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
2025                                                                             \
2026   develop(bool, ReplayCompiles, false,                                      \
2027           "Enable replay of compilations from ReplayDataFile")              \
2028                                                                             \
2029   product(ccstr, ReplayDataFile, NULL,                                      \
2030           "File containing compilation replay information"                  \
2031           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
2032                                                                             \
2033    product(ccstr, InlineDataFile, NULL,                                     \
2034           "File containing inlining replay information"                     \
2035           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
2036                                                                             \
2037   develop(intx, ReplaySuppressInitializers, 2,                              \
2038           "Control handling of class initialization during replay: "        \
2039           "0 - don't do anything special; "                                 \
2040           "1 - treat all class initializers as empty; "                     \
2041           "2 - treat class initializers for application classes as empty; " \
2042           "3 - allow all class initializers to run during bootstrap but "   \
2043           "    pretend they are empty after starting replay")               \
2044           range(0, 3)                                                       \
2045                                                                             \
2046   develop(bool, ReplayIgnoreInitErrors, false,                              \
2047           "Ignore exceptions thrown during initialization for replay")      \
2048                                                                             \
2049   product(bool, DumpReplayDataOnError, true,                                \
2050           "Record replay data for crashing compiler threads")               \
2051                                                                             \
2052   product(bool, CICompilerCountPerCPU, false,                               \
2053           "1 compiler thread for log(N CPUs)")                              \
2054                                                                             \
2055   develop(intx, CIFireOOMAt,    -1,                                         \
2056           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
2057           "(non-negative value throws OOM after this many CI accesses "     \
2058           "in each compile)")                                               \
2059   notproduct(intx, CICrashAt, -1,                                           \
2060           "id of compilation to trigger assert in compiler thread for "     \
2061           "the purpose of testing, e.g. generation of replay data")         \
2062   notproduct(bool, CIObjectFactoryVerify, false,                            \
2063           "enable potentially expensive verification in ciObjectFactory")   \
2064                                                                             \
2065   /* Priorities */                                                          \
2066   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
2067                                                                             \
2068   product(intx, ThreadPriorityPolicy, 0,                                    \
2069           "0 : Normal.                                                     "\
2070           "    VM chooses priorities that are appropriate for normal       "\
2071           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
2072           "    to normal native priority. Java priorities below "           \
2073           "    NORM_PRIORITY map to lower native priority values. On       "\
2074           "    Windows applications are allowed to use higher native       "\
2075           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
2076           "    not use the highest possible native priority,               "\
2077           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
2078           "    system threads. On Linux thread priorities are ignored      "\
2079           "    because the OS does not support static priority in          "\
2080           "    SCHED_OTHER scheduling class which is the only choice for   "\
2081           "    non-root, non-realtime applications.                        "\
2082           "1 : Aggressive.                                                 "\
2083           "    Java thread priorities map over to the entire range of      "\
2084           "    native thread priorities. Higher Java thread priorities map "\
2085           "    to higher native thread priorities. This policy should be   "\
2086           "    used with care, as sometimes it can cause performance       "\
2087           "    degradation in the application and/or the entire system. On "\
2088           "    Linux this policy requires root privilege.")                 \
2089           range(0, 1)                                                       \
2090                                                                             \
2091   product(bool, ThreadPriorityVerbose, false,                               \
2092           "Print priority changes")                                         \
2093                                                                             \
2094   product(intx, CompilerThreadPriority, -1,                                 \
2095           "The native priority at which compiler threads should run "       \
2096           "(-1 means no change)")                                           \
2097           range(min_jint, max_jint)                                         \
2098           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
2099                                                                             \
2100   product(intx, VMThreadPriority, -1,                                       \
2101           "The native priority at which the VM thread should run "          \
2102           "(-1 means no change)")                                           \
2103           range(-1, 127)                                                    \
2104                                                                             \
2105   product(bool, CompilerThreadHintNoPreempt, false,                         \
2106           "(Solaris only) Give compiler threads an extra quanta")           \
2107                                                                             \
2108   product(bool, VMThreadHintNoPreempt, false,                               \
2109           "(Solaris only) Give VM thread an extra quanta")                  \
2110                                                                             \
2111   product(intx, JavaPriority1_To_OSPriority, -1,                            \
2112           "Map Java priorities to OS priorities")                           \
2113           range(-1, 127)                                                    \
2114                                                                             \
2115   product(intx, JavaPriority2_To_OSPriority, -1,                            \
2116           "Map Java priorities to OS priorities")                           \
2117           range(-1, 127)                                                    \
2118                                                                             \
2119   product(intx, JavaPriority3_To_OSPriority, -1,                            \
2120           "Map Java priorities to OS priorities")                           \
2121           range(-1, 127)                                                    \
2122                                                                             \
2123   product(intx, JavaPriority4_To_OSPriority, -1,                            \
2124           "Map Java priorities to OS priorities")                           \
2125           range(-1, 127)                                                    \
2126                                                                             \
2127   product(intx, JavaPriority5_To_OSPriority, -1,                            \
2128           "Map Java priorities to OS priorities")                           \
2129           range(-1, 127)                                                    \
2130                                                                             \
2131   product(intx, JavaPriority6_To_OSPriority, -1,                            \
2132           "Map Java priorities to OS priorities")                           \
2133           range(-1, 127)                                                    \
2134                                                                             \
2135   product(intx, JavaPriority7_To_OSPriority, -1,                            \
2136           "Map Java priorities to OS priorities")                           \
2137           range(-1, 127)                                                    \
2138                                                                             \
2139   product(intx, JavaPriority8_To_OSPriority, -1,                            \
2140           "Map Java priorities to OS priorities")                           \
2141           range(-1, 127)                                                    \
2142                                                                             \
2143   product(intx, JavaPriority9_To_OSPriority, -1,                            \
2144           "Map Java priorities to OS priorities")                           \
2145           range(-1, 127)                                                    \
2146                                                                             \
2147   product(intx, JavaPriority10_To_OSPriority,-1,                            \
2148           "Map Java priorities to OS priorities")                           \
2149           range(-1, 127)                                                    \
2150                                                                             \
2151   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
2152           "Java thread priority 10 maps to critical scheduling priority")   \
2153                                                                             \
2154   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
2155           "Compiler thread(s) run at critical scheduling priority")         \
2156                                                                             \
2157   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
2158           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
2159                                                                             \
2160   /* compiler debugging */                                                  \
2161   notproduct(intx, CompileTheWorldStartAt,     1,                           \
2162           "First class to consider when using +CompileTheWorld")            \
2163                                                                             \
2164   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
2165           "Last class to consider when using +CompileTheWorld")             \
2166                                                                             \
2167   develop(intx, NewCodeParameter,      0,                                   \
2168           "Testing Only: Create a dedicated integer parameter before "      \
2169           "putback")                                                        \
2170                                                                             \
2171   /* new oopmap storage allocation */                                       \
2172   develop(intx, MinOopMapAllocation,     8,                                 \
2173           "Minimum number of OopMap entries in an OopMapSet")               \
2174                                                                             \
2175   /* Background Compilation */                                              \
2176   develop(intx, LongCompileThreshold,     50,                               \
2177           "Used with +TraceLongCompiles")                                   \
2178                                                                             \
2179   /* recompilation */                                                       \
2180   product_pd(intx, CompileThreshold,                                        \
2181           "number of interpreted method invocations before (re-)compiling") \
2182           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
2183                                                                             \
2184   product(double, CompileThresholdScaling, 1.0,                             \
2185           "Factor to control when first compilation happens "               \
2186           "(both with and without tiered compilation): "                    \
2187           "values greater than 1.0 delay counter overflow, "                \
2188           "values between 0 and 1.0 rush counter overflow, "                \
2189           "value of 1.0 leaves compilation thresholds unchanged "           \
2190           "value of 0.0 is equivalent to -Xint. "                           \
2191           ""                                                                \
2192           "Flag can be set as per-method option. "                          \
2193           "If a value is specified for a method, compilation thresholds "   \
2194           "for that method are scaled by both the value of the global flag "\
2195           "and the value of the per-method flag.")                          \
2196           range(0.0, DBL_MAX)                                               \
2197                                                                             \
2198   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
2199           "Interpreter (tier 0) invocation notification frequency")         \
2200           range(0, 30)                                                      \
2201                                                                             \
2202   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
2203           "C1 without MDO (tier 2) invocation notification frequency")      \
2204           range(0, 30)                                                      \
2205                                                                             \
2206   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
2207           "C1 with MDO profiling (tier 3) invocation notification "         \
2208           "frequency")                                                      \
2209           range(0, 30)                                                      \
2210                                                                             \
2211   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
2212           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
2213           range(0, 30)                                                      \
2214                                                                             \
2215   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
2216           "Interpreter (tier 0) invocation notification frequency")         \
2217           range(0, 30)                                                      \
2218                                                                             \
2219   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
2220           "C1 without MDO (tier 2) invocation notification frequency")      \
2221           range(0, 30)                                                      \
2222                                                                             \
2223   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
2224           "C1 with MDO profiling (tier 3) invocation notification "         \
2225           "frequency")                                                      \
2226           range(0, 30)                                                      \
2227                                                                             \
2228   product(intx, Tier2CompileThreshold, 0,                                   \
2229           "threshold at which tier 2 compilation is invoked")               \
2230           range(0, max_jint)                                                \
2231                                                                             \
2232   product(intx, Tier2BackEdgeThreshold, 0,                                  \
2233           "Back edge threshold at which tier 2 compilation is invoked")     \
2234           range(0, max_jint)                                                \
2235                                                                             \
2236   product(intx, Tier3InvocationThreshold, 200,                              \
2237           "Compile if number of method invocations crosses this "           \
2238           "threshold")                                                      \
2239           range(0, max_jint)                                                \
2240                                                                             \
2241   product(intx, Tier3MinInvocationThreshold, 100,                           \
2242           "Minimum invocation to compile at tier 3")                        \
2243           range(0, max_jint)                                                \
2244                                                                             \
2245   product(intx, Tier3CompileThreshold, 2000,                                \
2246           "Threshold at which tier 3 compilation is invoked (invocation "   \
2247           "minimum must be satisfied)")                                     \
2248           range(0, max_jint)                                                \
2249                                                                             \
2250   product(intx, Tier3BackEdgeThreshold,  60000,                             \
2251           "Back edge threshold at which tier 3 OSR compilation is invoked") \
2252           range(0, max_jint)                                                \
2253                                                                             \
2254   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
2255           "Compile if number of method invocations crosses this "           \
2256           "threshold if coming from AOT")                                   \
2257           range(0, max_jint)                                                \
2258                                                                             \
2259   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
2260           "Minimum invocation to compile at tier 3 if coming from AOT")     \
2261           range(0, max_jint)                                                \
2262                                                                             \
2263   product(intx, Tier3AOTCompileThreshold, 15000,                            \
2264           "Threshold at which tier 3 compilation is invoked (invocation "   \
2265           "minimum must be satisfied) if coming from AOT")                  \
2266           range(0, max_jint)                                                \
2267                                                                             \
2268   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
2269           "Back edge threshold at which tier 3 OSR compilation is invoked " \
2270           "if coming from AOT")                                             \
2271           range(0, max_jint)                                                \
2272                                                                             \
2273   product(intx, Tier4InvocationThreshold, 5000,                             \
2274           "Compile if number of method invocations crosses this "           \
2275           "threshold")                                                      \
2276           range(0, max_jint)                                                \
2277                                                                             \
2278   product(intx, Tier4MinInvocationThreshold, 600,                           \
2279           "Minimum invocation to compile at tier 4")                        \
2280           range(0, max_jint)                                                \
2281                                                                             \
2282   product(intx, Tier4CompileThreshold, 15000,                               \
2283           "Threshold at which tier 4 compilation is invoked (invocation "   \
2284           "minimum must be satisfied")                                      \
2285           range(0, max_jint)                                                \
2286                                                                             \
2287   product(intx, Tier4BackEdgeThreshold, 40000,                              \
2288           "Back edge threshold at which tier 4 OSR compilation is invoked") \
2289           range(0, max_jint)                                                \
2290                                                                             \
2291   product(intx, Tier3DelayOn, 5,                                            \
2292           "If C2 queue size grows over this amount per compiler thread "    \
2293           "stop compiling at tier 3 and start compiling at tier 2")         \
2294           range(0, max_jint)                                                \
2295                                                                             \
2296   product(intx, Tier3DelayOff, 2,                                           \
2297           "If C2 queue size is less than this amount per compiler thread "  \
2298           "allow methods compiled at tier 2 transition to tier 3")          \
2299           range(0, max_jint)                                                \
2300                                                                             \
2301   product(intx, Tier3LoadFeedback, 5,                                       \
2302           "Tier 3 thresholds will increase twofold when C1 queue size "     \
2303           "reaches this amount per compiler thread")                        \
2304           range(0, max_jint)                                                \
2305                                                                             \
2306   product(intx, Tier4LoadFeedback, 3,                                       \
2307           "Tier 4 thresholds will increase twofold when C2 queue size "     \
2308           "reaches this amount per compiler thread")                        \
2309           range(0, max_jint)                                                \
2310                                                                             \
2311   product(intx, TieredCompileTaskTimeout, 50,                               \
2312           "Kill compile task if method was not used within "                \
2313           "given timeout in milliseconds")                                  \
2314           range(0, max_intx)                                                \
2315                                                                             \
2316   product(intx, TieredStopAtLevel, 4,                                       \
2317           "Stop at given compilation level")                                \
2318           range(0, 4)                                                       \
2319                                                                             \
2320   product(intx, Tier0ProfilingStartPercentage, 200,                         \
2321           "Start profiling in interpreter if the counters exceed tier 3 "   \
2322           "thresholds by the specified percentage")                         \
2323           range(0, max_jint)                                                \
2324                                                                             \
2325   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
2326           "Increase the compile threshold for C1 compilation if the code "  \
2327           "cache is filled by the specified percentage")                    \
2328           range(0, 99)                                                      \
2329                                                                             \
2330   product(intx, TieredRateUpdateMinTime, 1,                                 \
2331           "Minimum rate sampling interval (in milliseconds)")               \
2332           range(0, max_intx)                                                \
2333                                                                             \
2334   product(intx, TieredRateUpdateMaxTime, 25,                                \
2335           "Maximum rate sampling interval (in milliseconds)")               \
2336           range(0, max_intx)                                                \
2337                                                                             \
2338   product_pd(bool, TieredCompilation,                                       \
2339           "Enable tiered compilation")                                      \
2340                                                                             \
2341   product(bool, PrintTieredEvents, false,                                   \
2342           "Print tiered events notifications")                              \
2343                                                                             \
2344   product_pd(intx, OnStackReplacePercentage,                                \
2345           "NON_TIERED number of method invocations/branches (expressed as " \
2346           "% of CompileThreshold) before (re-)compiling OSR code")          \
2347           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
2348                                                                             \
2349   product(intx, InterpreterProfilePercentage, 33,                           \
2350           "NON_TIERED number of method invocations/branches (expressed as " \
2351           "% of CompileThreshold) before profiling in the interpreter")     \
2352           range(0, 100)                                                     \
2353                                                                             \
2354   develop(intx, MaxRecompilationSearchLength,    10,                        \
2355           "The maximum number of frames to inspect when searching for "     \
2356           "recompilee")                                                     \
2357                                                                             \
2358   develop(intx, MaxInterpretedSearchLength,     3,                          \
2359           "The maximum number of interpreted frames to skip when searching "\
2360           "for recompilee")                                                 \
2361                                                                             \
2362   develop(intx, DesiredMethodLimit,  8000,                                  \
2363           "The desired maximum method size (in bytecodes) after inlining")  \
2364                                                                             \
2365   develop(intx, HugeMethodLimit,  8000,                                     \
2366           "Don't compile methods larger than this if "                      \
2367           "+DontCompileHugeMethods")                                        \
2368                                                                             \
2369   /* New JDK 1.4 reflection implementation */                               \
2370                                                                             \
2371   develop(intx, FastSuperclassLimit, 8,                                     \
2372           "Depth of hardwired instanceof accelerator array")                \
2373                                                                             \
2374   /* Properties for Java libraries  */                                      \
2375                                                                             \
2376   product(uint64_t, MaxDirectMemorySize, 0,                                 \
2377           "Maximum total size of NIO direct-buffer allocations")            \
2378           range(0, max_jlong)                                               \
2379                                                                             \
2380   /* Flags used for temporary code during development  */                   \
2381                                                                             \
2382   diagnostic(bool, UseNewCode, false,                                       \
2383           "Testing Only: Use the new version while testing")                \
2384                                                                             \
2385   diagnostic(bool, UseNewCode2, false,                                      \
2386           "Testing Only: Use the new version while testing")                \
2387                                                                             \
2388   diagnostic(bool, UseNewCode3, false,                                      \
2389           "Testing Only: Use the new version while testing")                \
2390                                                                             \
2391   /* flags for performance data collection */                               \
2392                                                                             \
2393   product(bool, UsePerfData, true,                                          \
2394           "Flag to disable jvmstat instrumentation for performance testing "\
2395           "and problem isolation purposes")                                 \
2396                                                                             \
2397   product(bool, PerfDataSaveToFile, false,                                  \
2398           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
2399                                                                             \
2400   product(ccstr, PerfDataSaveFile, NULL,                                    \
2401           "Save PerfData memory to the specified absolute pathname. "       \
2402           "The string %p in the file name (if present) "                    \
2403           "will be replaced by pid")                                        \
2404                                                                             \
2405   product(intx, PerfDataSamplingInterval, 50,                               \
2406           "Data sampling interval (in milliseconds)")                       \
2407           range(PeriodicTask::min_interval, max_jint)                       \
2408           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
2409                                                                             \
2410   product(bool, PerfDisableSharedMem, false,                                \
2411           "Store performance data in standard memory")                      \
2412                                                                             \
2413   product(intx, PerfDataMemorySize, 32*K,                                   \
2414           "Size of performance data memory region. Will be rounded "        \
2415           "up to a multiple of the native os page size.")                   \
2416           range(128, 32*64*K)                                               \
2417                                                                             \
2418   product(intx, PerfMaxStringConstLength, 1024,                             \
2419           "Maximum PerfStringConstant string length before truncation")     \
2420           range(32, 32*K)                                                   \
2421                                                                             \
2422   product(bool, PerfAllowAtExitRegistration, false,                         \
2423           "Allow registration of atexit() methods")                         \
2424                                                                             \
2425   product(bool, PerfBypassFileSystemCheck, false,                           \
2426           "Bypass Win32 file system criteria checks (Windows Only)")        \
2427                                                                             \
2428   product(intx, UnguardOnExecutionViolation, 0,                             \
2429           "Unguard page and retry on no-execute fault (Win32 only) "        \
2430           "0=off, 1=conservative, 2=aggressive")                            \
2431           range(0, 2)                                                       \
2432                                                                             \
2433   /* Serviceability Support */                                              \
2434                                                                             \
2435   product(bool, ManagementServer, false,                                    \
2436           "Create JMX Management Server")                                   \
2437                                                                             \
2438   product(bool, DisableAttachMechanism, false,                              \
2439           "Disable mechanism that allows tools to attach to this VM")       \
2440                                                                             \
2441   product(bool, StartAttachListener, false,                                 \
2442           "Always start Attach Listener at VM startup")                     \
2443                                                                             \
2444   product(bool, EnableDynamicAgentLoading, true,                            \
2445           "Allow tools to load agents with the attach mechanism")           \
2446                                                                             \
2447   manageable(bool, PrintConcurrentLocks, false,                             \
2448           "Print java.util.concurrent locks in thread dump")                \
2449                                                                             \
2450   product(bool, TransmitErrorReport, false,                                 \
2451           "Enable error report transmission on erroneous termination")      \
2452                                                                             \
2453   product(ccstr, ErrorReportServer, NULL,                                   \
2454           "Override built-in error report server address")                  \
2455                                                                             \
2456   /* Shared spaces */                                                       \
2457                                                                             \
2458   product(bool, UseSharedSpaces, true,                                      \
2459           "Use shared spaces for metadata")                                 \
2460                                                                             \
2461   product(bool, VerifySharedSpaces, false,                                  \
2462           "Verify shared spaces (false for default archive, true for "      \
2463           "archive specified by -XX:SharedArchiveFile)")                    \
2464                                                                             \
2465   product(bool, RequireSharedSpaces, false,                                 \
2466           "Require shared spaces for metadata")                             \
2467                                                                             \
2468   product(bool, DumpSharedSpaces, false,                                    \
2469           "Special mode: JVM reads a class list, loads classes, builds "    \
2470           "shared spaces, and dumps the shared spaces to a file to be "     \
2471           "used in future JVM runs")                                        \
2472                                                                             \
2473   product(bool, PrintSharedArchiveAndExit, false,                           \
2474           "Print shared archive file contents")                             \
2475                                                                             \
2476   product(bool, PrintSharedDictionary, false,                               \
2477           "If PrintSharedArchiveAndExit is true, also print the shared "    \
2478           "dictionary")                                                     \
2479                                                                             \
2480   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
2481           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
2482           "Address to allocate shared memory region for class data")        \
2483           range(0, SIZE_MAX)                                                \
2484                                                                             \
2485   product(ccstr, SharedArchiveConfigFile, NULL,                             \
2486           "Data to add to the CDS archive file")                            \
2487                                                                             \
2488   product(uintx, SharedSymbolTableBucketSize, 4,                            \
2489           "Average number of symbols per bucket in shared table")           \
2490           range(2, 246)                                                     \
2491                                                                             \
2492   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true,              \
2493           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
2494           "classes. Just exclude them from the shared dictionary.")         \
2495                                                                             \
2496   diagnostic(bool, PrintMethodHandleStubs, false,                           \
2497           "Print generated stub code for method handles")                   \
2498                                                                             \
2499   develop(bool, TraceMethodHandles, false,                                  \
2500           "trace internal method handle operations")                        \
2501                                                                             \
2502   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
2503           "perform extra checks when constructing method handles")          \
2504                                                                             \
2505   diagnostic(bool, ShowHiddenFrames, false,                                 \
2506           "show method handle implementation frames (usually hidden)")      \
2507                                                                             \
2508   experimental(bool, TrustFinalNonStaticFields, false,                      \
2509           "trust final non-static declarations for constant folding")       \
2510                                                                             \
2511   diagnostic(bool, FoldStableValues, true,                                  \
2512           "Optimize loads from stable fields (marked w/ @Stable)")          \
2513                                                                             \
2514   develop(bool, TraceInvokeDynamic, false,                                  \
2515           "trace internal invoke dynamic operations")                       \
2516                                                                             \
2517   diagnostic(int, UseBootstrapCallInfo, 1,                                  \
2518           "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2519           "resolved before the bootstrap method is called; 1: when a BSM "  \
2520           "that may accept a BootstrapCallInfo is detected, use that API "  \
2521           "to pass BSM arguments, which allows the BSM to delay their "     \
2522           "resolution; 2+: stress test the BCI API by calling more BSMs "   \
2523           "via that API, instead of with the eagerly-resolved array.")      \
2524                                                                             \
2525   diagnostic(bool, PauseAtStartup,      false,                              \
2526           "Causes the VM to pause at startup time and wait for the pause "  \
2527           "file to be removed (default: ./vm.paused.<pid>)")                \
2528                                                                             \
2529   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
2530           "The file to create and for whose removal to await when pausing " \
2531           "at startup. (default: ./vm.paused.<pid>)")                       \
2532                                                                             \
2533   diagnostic(bool, PauseAtExit, false,                                      \
2534           "Pause and wait for keypress on exit if a debugger is attached")  \
2535                                                                             \
2536   product(bool, ExtendedDTraceProbes,    false,                             \
2537           "Enable performance-impacting dtrace probes")                     \
2538                                                                             \
2539   product(bool, DTraceMethodProbes, false,                                  \
2540           "Enable dtrace probes for method-entry and method-exit")          \
2541                                                                             \
2542   product(bool, DTraceAllocProbes, false,                                   \
2543           "Enable dtrace probes for object allocation")                     \
2544                                                                             \
2545   product(bool, DTraceMonitorProbes, false,                                 \
2546           "Enable dtrace probes for monitor events")                        \
2547                                                                             \
2548   product(bool, RelaxAccessControlCheck, false,                             \
2549           "Relax the access control checks in the verifier")                \
2550                                                                             \
2551   product(uintx, StringTableSize, defaultStringTableSize,                   \
2552           "Number of buckets in the interned String table "                 \
2553           "(will be rounded to nearest higher power of 2)")                 \
2554           range(minimumStringTableSize, 16777216ul)                         \
2555                                                                             \
2556   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
2557           "Number of buckets in the JVM internal Symbol table")             \
2558           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
2559                                                                             \
2560   product(bool, UseStringDeduplication, false,                              \
2561           "Use string deduplication")                                       \
2562                                                                             \
2563   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
2564           "A string must reach this age (or be promoted to an old region) " \
2565           "to be considered for deduplication")                             \
2566           range(1, markOopDesc::max_age)                                    \
2567                                                                             \
2568   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
2569           "Force table resize every time the table is scanned")             \
2570                                                                             \
2571   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
2572           "Force table rehash every time the table is scanned")             \
2573                                                                             \
2574   diagnostic(bool, WhiteBoxAPI, false,                                      \
2575           "Enable internal testing APIs")                                   \
2576                                                                             \
2577   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
2578            "Default survivor space alignment in bytes")                     \
2579            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
2580                                                                             \
2581   product(bool , AllowNonVirtualCalls, false,                               \
2582           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
2583                                                                             \
2584   product(ccstr, DumpLoadedClassList, NULL,                                 \
2585           "Dump the names all loaded classes, that could be stored into "   \
2586           "the CDS archive, in the specified file")                         \
2587                                                                             \
2588   product(ccstr, SharedClassListFile, NULL,                                 \
2589           "Override the default CDS class list")                            \
2590                                                                             \
2591   product(ccstr, SharedArchiveFile, NULL,                                   \
2592           "Override the default location of the CDS archive file")          \
2593                                                                             \
2594   product(ccstr, ExtraSharedClassListFile, NULL,                            \
2595           "Extra classlist for building the CDS archive file")              \
2596                                                                             \
2597   experimental(size_t, ArrayAllocatorMallocLimit,                           \
2598           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
2599           "Allocation less than this value will be allocated "              \
2600           "using malloc. Larger allocations will use mmap.")                \
2601                                                                             \
2602   experimental(bool, AlwaysAtomicAccesses, false,                           \
2603           "Accesses to all variables should always be atomic")              \
2604                                                                             \
2605   diagnostic(bool, UseUnalignedAccesses, false,                             \
2606           "Use unaligned memory accesses in Unsafe")                        \
2607                                                                             \
2608   product_pd(bool, PreserveFramePointer,                                    \
2609              "Use the FP register for holding the frame pointer "           \
2610              "and not as a general purpose register.")                      \
2611                                                                             \
2612   diagnostic(bool, CheckIntrinsics, true,                                   \
2613              "When a class C is loaded, check that "                        \
2614              "(1) all intrinsics defined by the VM for class C are present "\
2615              "in the loaded class file and are marked with the "            \
2616              "@HotSpotIntrinsicCandidate annotation, that "                 \
2617              "(2) there is an intrinsic registered for all loaded methods " \
2618              "that are annotated with the @HotSpotIntrinsicCandidate "      \
2619              "annotation, and that "                                        \
2620              "(3) no orphan methods exist for class C (i.e., methods for "  \
2621              "which the VM declares an intrinsic but that are not declared "\
2622              "in the loaded class C. "                                      \
2623              "Check (3) is available only in debug builds.")                \
2624                                                                             \
2625   diagnostic_pd(intx, InitArrayShortSize,                                   \
2626           "Threshold small size (in bytes) for clearing arrays. "           \
2627           "Anything this size or smaller may get converted to discrete "    \
2628           "scalar stores.")                                                 \
2629           range(0, max_intx)                                                \
2630           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
2631                                                                             \
2632   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
2633              "Disable backwards compatibility for compile commands.")       \
2634                                                                             \
2635   diagnostic(bool, CompilerDirectivesPrint, false,                          \
2636              "Print compiler directives on installation.")                  \
2637   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
2638              "Limit on number of compiler directives.")                     \
2639                                                                             \
2640   product(ccstr, AllocateHeapAt, NULL,                                      \
2641           "Path to the directoy where a temporary file will be created "    \
2642           "to use as the backing store for Java Heap.")                     \
2643                                                                             \
2644   develop(bool, VerifyMetaspace, false,                                     \
2645           "Verify metaspace on chunk movements.")                           \
2646                                                                             \
2647   diagnostic(bool, ShowRegistersOnAssert, false,                            \
2648           "On internal errors, include registers in error report.")         \
2649                                                                             \
2650   experimental(bool, UseSwitchProfiling, true,                              \
2651           "leverage profiling for table/lookup switch")                     \
2652                                                                             \
2653   JFR_ONLY(product(bool, FlightRecorder, false,                             \
2654           "Enable Flight Recorder"))                                        \
2655                                                                             \
2656   JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL,                      \
2657           "Flight Recorder options"))                                       \
2658                                                                             \
2659   JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
2660           "Start flight recording with options"))                           \
2661                                                                             \
2662   experimental(bool, UseFastUnorderedTimeStamps, false,                     \
2663           "Use platform unstable time where supported for timestamps only")
2664 
2665 #define VM_FLAGS(develop,                                                   \
2666                  develop_pd,                                                \
2667                  product,                                                   \
2668                  product_pd,                                                \
2669                  diagnostic,                                                \
2670                  diagnostic_pd,                                             \
2671                  experimental,                                              \
2672                  notproduct,                                                \
2673                  manageable,                                                \
2674                  product_rw,                                                \
2675                  lp64_product,                                              \
2676                  range,                                                     \
2677                  constraint,                                                \
2678                  writeable)                                                 \
2679                                                                             \
2680   RUNTIME_FLAGS(                                                            \
2681     develop,                                                                \
2682     develop_pd,                                                             \
2683     product,                                                                \
2684     product_pd,                                                             \
2685     diagnostic,                                                             \
2686     diagnostic_pd,                                                          \
2687     experimental,                                                           \
2688     notproduct,                                                             \
2689     manageable,                                                             \
2690     product_rw,                                                             \
2691     lp64_product,                                                           \
2692     range,                                                                  \
2693     constraint,                                                             \
2694     writeable)                                                              \
2695                                                                             \
2696   GC_FLAGS(                                                                 \
2697     develop,                                                                \
2698     develop_pd,                                                             \
2699     product,                                                                \
2700     product_pd,                                                             \
2701     diagnostic,                                                             \
2702     diagnostic_pd,                                                          \
2703     experimental,                                                           \
2704     notproduct,                                                             \
2705     manageable,                                                             \
2706     product_rw,                                                             \
2707     lp64_product,                                                           \
2708     range,                                                                  \
2709     constraint,                                                             \
2710     writeable)                                                              \
2711 
2712 /*
2713  *  Macros for factoring of globals
2714  */
2715 
2716 // Interface macros
2717 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
2718 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
2719 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
2720 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
2721 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
2722 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
2723 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
2724 #ifdef PRODUCT
2725 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
2726 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
2727 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
2728 #else
2729 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
2730 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
2731 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
2732 #endif // PRODUCT
2733 // Special LP64 flags, product only needed for now.
2734 #ifdef _LP64
2735 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2736 #else
2737 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
2738 #endif // _LP64
2739 
2740 // Implementation macros
2741 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
2742 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
2743 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
2744 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
2745 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
2746 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
2747 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
2748 #ifdef PRODUCT
2749 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
2750 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
2751 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
2752 #else
2753 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
2754 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
2755 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
2756 #endif // PRODUCT
2757 #ifdef _LP64
2758 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
2759 #else
2760 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
2761 #endif // _LP64
2762 
2763 // Only materialize src code for range checking when required, ignore otherwise
2764 #define IGNORE_RANGE(a, b)
2765 // Only materialize src code for contraint checking when required, ignore otherwise
2766 #define IGNORE_CONSTRAINT(func,type)
2767 
2768 #define IGNORE_WRITEABLE(type)
2769 
2770 VM_FLAGS(DECLARE_DEVELOPER_FLAG, \
2771          DECLARE_PD_DEVELOPER_FLAG, \
2772          DECLARE_PRODUCT_FLAG, \
2773          DECLARE_PD_PRODUCT_FLAG, \
2774          DECLARE_DIAGNOSTIC_FLAG, \
2775          DECLARE_PD_DIAGNOSTIC_FLAG, \
2776          DECLARE_EXPERIMENTAL_FLAG, \
2777          DECLARE_NOTPRODUCT_FLAG, \
2778          DECLARE_MANAGEABLE_FLAG, \
2779          DECLARE_PRODUCT_RW_FLAG, \
2780          DECLARE_LP64_PRODUCT_FLAG, \
2781          IGNORE_RANGE, \
2782          IGNORE_CONSTRAINT, \
2783          IGNORE_WRITEABLE)
2784 
2785 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
2786                  DECLARE_PD_DEVELOPER_FLAG, \
2787                  DECLARE_PRODUCT_FLAG, \
2788                  DECLARE_PD_PRODUCT_FLAG, \
2789                  DECLARE_DIAGNOSTIC_FLAG, \
2790                  DECLARE_PD_DIAGNOSTIC_FLAG, \
2791                  DECLARE_NOTPRODUCT_FLAG, \
2792                  IGNORE_RANGE, \
2793                  IGNORE_CONSTRAINT, \
2794                  IGNORE_WRITEABLE)
2795 
2796 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
2797            DECLARE_PRODUCT_FLAG, \
2798            DECLARE_DIAGNOSTIC_FLAG, \
2799            DECLARE_EXPERIMENTAL_FLAG, \
2800            DECLARE_NOTPRODUCT_FLAG, \
2801            IGNORE_RANGE, \
2802            IGNORE_CONSTRAINT, \
2803            IGNORE_WRITEABLE)
2804 
2805 // Extensions
2806 
2807 #include "runtime/globals_ext.hpp"
2808 
2809 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP