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