1 /*
   2  * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "gc/shared/gc_globals.hpp"
  29 #include "utilities/align.hpp"
  30 #include "utilities/globalDefinitions.hpp"
  31 #include "utilities/macros.hpp"
  32 
  33 #include <float.h> // for DBL_MAX
  34 
  35 // The larger HeapWordSize for 64bit requires larger heaps
  36 // for the same application running in 64bit.  See bug 4967770.
  37 // The minimum alignment to a heap word size is done.  Other
  38 // parts of the memory system may require additional alignment
  39 // and are responsible for those alignments.
  40 #ifdef _LP64
  41 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize)
  42 #else
  43 #define ScaleForWordSize(x) (x)
  44 #endif
  45 
  46 // use this for flags that are true per default in the tiered build
  47 // but false in non-tiered builds, and vice versa
  48 #ifdef TIERED
  49 #define  trueInTiered true
  50 #define falseInTiered false
  51 #else
  52 #define  trueInTiered false
  53 #define falseInTiered true
  54 #endif
  55 
  56 #include CPU_HEADER(globals)
  57 #include OS_HEADER(globals)
  58 #include OS_CPU_HEADER(globals)
  59 #ifdef COMPILER1
  60 #include CPU_HEADER(c1_globals)
  61 #include OS_HEADER(c1_globals)
  62 #endif
  63 #ifdef COMPILER2
  64 #include CPU_HEADER(c2_globals)
  65 #include OS_HEADER(c2_globals)
  66 #endif
  67 
  68 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI
  69 define_pd_global(bool, BackgroundCompilation,        false);
  70 define_pd_global(bool, UseTLAB,                      false);
  71 define_pd_global(bool, CICompileOSR,                 false);
  72 define_pd_global(bool, UseTypeProfile,               false);
  73 define_pd_global(bool, UseOnStackReplacement,        false);
  74 define_pd_global(bool, InlineIntrinsics,             false);
  75 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  76 define_pd_global(bool, ProfileInterpreter,           false);
  77 define_pd_global(bool, ProfileTraps,                 false);
  78 define_pd_global(bool, TieredCompilation,            false);
  79 
  80 define_pd_global(intx, CompileThreshold,             0);
  81 
  82 define_pd_global(intx,   OnStackReplacePercentage,   0);
  83 define_pd_global(bool,   ResizeTLAB,                 false);
  84 define_pd_global(intx,   FreqInlineSize,             0);
  85 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
  86 define_pd_global(bool,   InlineClassNatives,         true);
  87 define_pd_global(bool,   InlineUnsafeOps,            true);
  88 define_pd_global(uintx,  InitialCodeCacheSize,       160*K);
  89 define_pd_global(uintx,  ReservedCodeCacheSize,      32*M);
  90 define_pd_global(uintx,  NonProfiledCodeHeapSize,    0);
  91 define_pd_global(uintx,  ProfiledCodeHeapSize,       0);
  92 define_pd_global(uintx,  NonNMethodCodeHeapSize,     32*M);
  93 
  94 define_pd_global(uintx,  CodeCacheExpansionSize,     32*K);
  95 define_pd_global(uintx,  CodeCacheMinBlockLength,    1);
  96 define_pd_global(uintx,  CodeCacheMinimumUseSpace,   200*K);
  97 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
  98 define_pd_global(bool, NeverActAsServerClassMachine, true);
  99 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 100 #define CI_COMPILER_COUNT 0
 101 #else
 102 
 103 #if COMPILER2_OR_JVMCI
 104 #define CI_COMPILER_COUNT 2
 105 #else
 106 #define CI_COMPILER_COUNT 1
 107 #endif // COMPILER2_OR_JVMCI
 108 
 109 #endif // no compilers
 110 
 111 // use this for flags that are true by default in the debug version but
 112 // false in the optimized version, and vice versa
 113 #ifdef ASSERT
 114 #define trueInDebug  true
 115 #define falseInDebug false
 116 #else
 117 #define trueInDebug  false
 118 #define falseInDebug true
 119 #endif
 120 
 121 // use this for flags that are true per default in the product build
 122 // but false in development builds, and vice versa
 123 #ifdef PRODUCT
 124 #define trueInProduct  true
 125 #define falseInProduct false
 126 #else
 127 #define trueInProduct  false
 128 #define falseInProduct true
 129 #endif
 130 
 131 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 132 // product flags are always settable / visible
 133 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 134 
 135 // A flag must be declared with one of the following types:
 136 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 137 // The type "ccstr" is an alias for "const char*" and is used
 138 // only in this file, because the macrology requires single-token type names.
 139 
 140 // Note: Diagnostic options not meant for VM tuning or for product modes.
 141 // They are to be used for VM quality assurance or field diagnosis
 142 // of VM bugs.  They are hidden so that users will not be encouraged to
 143 // try them as if they were VM ordinary execution options.  However, they
 144 // are available in the product version of the VM.  Under instruction
 145 // from support engineers, VM customers can turn them on to collect
 146 // diagnostic information about VM problems.  To use a VM diagnostic
 147 // option, you must first specify +UnlockDiagnosticVMOptions.
 148 // (This master switch also affects the behavior of -Xprintflags.)
 149 //
 150 // experimental flags are in support of features that are not
 151 //    part of the officially supported product, but are available
 152 //    for experimenting with. They could, for example, be performance
 153 //    features that may not have undergone full or rigorous QA, but which may
 154 //    help performance in some cases and released for experimentation
 155 //    by the community of users and developers. This flag also allows one to
 156 //    be able to build a fully supported product that nonetheless also
 157 //    ships with some unsupported, lightly tested, experimental features.
 158 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 159 //    UnlockExperimentalVMOptions flag, which allows the control and
 160 //    modification of the experimental flags.
 161 //
 162 // Nota bene: neither diagnostic nor experimental options should be used casually,
 163 //    and they are not supported on production loads, except under explicit
 164 //    direction from support engineers.
 165 //
 166 // manageable flags are writeable external product flags.
 167 //    They are dynamically writeable through the JDK management interface
 168 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 169 //    These flags are external exported interface (see CCC).  The list of
 170 //    manageable flags can be queried programmatically through the management
 171 //    interface.
 172 //
 173 //    A flag can be made as "manageable" only if
 174 //    - the flag is defined in a CCC as an external exported interface.
 175 //    - the VM implementation supports dynamic setting of the flag.
 176 //      This implies that the VM must *always* query the flag variable
 177 //      and not reuse state related to the flag state at any given time.
 178 //    - you want the flag to be queried programmatically by the customers.
 179 //
 180 // product_rw flags are writeable internal product flags.
 181 //    They are like "manageable" flags but for internal/private use.
 182 //    The list of product_rw flags are internal/private flags which
 183 //    may be changed/removed in a future release.  It can be set
 184 //    through the management interface to get/set value
 185 //    when the name of flag is supplied.
 186 //
 187 //    A flag can be made as "product_rw" only if
 188 //    - the VM implementation supports dynamic setting of the flag.
 189 //      This implies that the VM must *always* query the flag variable
 190 //      and not reuse state related to the flag state at any given time.
 191 //
 192 // Note that when there is a need to support develop flags to be writeable,
 193 // it can be done in the same way as product_rw.
 194 //
 195 // range is a macro that will expand to min and max arguments for range
 196 //    checking code if provided - see jvmFlagRangeList.hpp
 197 //
 198 // constraint is a macro that will expand to custom function call
 199 //    for constraint checking if provided - see jvmFlagConstraintList.hpp
 200 //
 201 // writeable is a macro that controls if and how the value can change during the runtime
 202 //
 203 // writeable(Always) is optional and allows the flag to have its value changed
 204 //    without any limitations at any time
 205 //
 206 // writeable(Once) flag value's can be only set once during the lifetime of VM
 207 //
 208 // writeable(CommandLineOnly) flag value's can be only set from command line
 209 //    (multiple times allowed)
 210 //
 211 
 212 
 213 #define RUNTIME_FLAGS(develop, \
 214                       develop_pd, \
 215                       product, \
 216                       product_pd, \
 217                       diagnostic, \
 218                       diagnostic_pd, \
 219                       experimental, \
 220                       notproduct, \
 221                       manageable, \
 222                       product_rw, \
 223                       lp64_product, \
 224                       range, \
 225                       constraint, \
 226                       writeable) \
 227                                                                             \
 228   lp64_product(bool, UseCompressedOops, false,                              \
 229           "Use 32-bit object references in 64-bit VM. "                     \
 230           "lp64_product means flag is always constant in 32 bit VM")        \
 231                                                                             \
 232   lp64_product(bool, UseCompressedClassPointers, false,                     \
 233           "Use 32-bit class pointers in 64-bit VM. "                        \
 234           "lp64_product means flag is always constant in 32 bit VM")        \
 235                                                                             \
 236   notproduct(bool, CheckCompressedOops, true,                               \
 237           "Generate checks in encoding/decoding code in debug VM")          \
 238                                                                             \
 239   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 240           "Heap allocation steps through preferred address regions to find" \
 241           " where it can allocate the heap. Number of steps to take per "   \
 242           "region.")                                                        \
 243           range(1, max_uintx)                                               \
 244                                                                             \
 245   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 246           "Default object alignment in bytes, 8 is minimum")                \
 247           range(8, 256)                                                     \
 248           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 249                                                                             \
 250   product(bool, AssumeMP, true,                                             \
 251           "(Deprecated) Instruct the VM to assume multiple processors are available")\
 252                                                                             \
 253   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 254   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 255   /* been re-added (see 6401008)                                         */ \
 256   product_pd(bool, UseMembar,                                               \
 257           "(Unstable) Issues membars on thread state transitions")          \
 258                                                                             \
 259   develop(bool, CleanChunkPoolAsync, true,                                  \
 260           "Clean the chunk pool asynchronously")                            \
 261                                                                             \
 262   product_pd(bool, ThreadLocalHandshakes,                                   \
 263           "Use thread-local polls instead of global poll for safepoints.")  \
 264           constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo)         \
 265                                                                             \
 266   diagnostic(uint, HandshakeTimeout, 0,                                     \
 267           "If nonzero set a timeout in milliseconds for handshakes")        \
 268                                                                             \
 269   experimental(bool, AlwaysSafeConstructors, false,                         \
 270           "Force safe construction, as if all fields are final.")           \
 271                                                                             \
 272   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 273           "Enable normal processing of flags relating to field diagnostics")\
 274                                                                             \
 275   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 276           "Enable normal processing of flags relating to experimental "     \
 277           "features")                                                       \
 278                                                                             \
 279   product(bool, JavaMonitorsInStackTrace, true,                             \
 280           "Print information about Java monitor locks when the stacks are"  \
 281           "dumped")                                                         \
 282                                                                             \
 283   product_pd(bool, UseLargePages,                                           \
 284           "Use large page memory")                                          \
 285                                                                             \
 286   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 287           "Allocate large pages individually for better affinity")          \
 288                                                                             \
 289   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 290           "Fail large pages individual allocation")                         \
 291                                                                             \
 292   product(bool, UseLargePagesInMetaspace, false,                            \
 293           "Use large page memory in metaspace. "                            \
 294           "Only used if UseLargePages is enabled.")                         \
 295                                                                             \
 296   product(bool, UseNUMA, false,                                             \
 297           "Use NUMA if available")                                          \
 298                                                                             \
 299   product(bool, UseNUMAInterleaving, false,                                 \
 300           "Interleave memory across NUMA nodes if available")               \
 301                                                                             \
 302   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 303           "Granularity to use for NUMA interleaving on Windows OS")         \
 304           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 305                                                                             \
 306   product(bool, ForceNUMA, false,                                           \
 307           "Force NUMA optimizations on single-node/UMA systems")            \
 308                                                                             \
 309   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 310           "Percentage (0-100) used to weight the current sample when "      \
 311           "computing exponentially decaying average for "                   \
 312           "AdaptiveNUMAChunkSizing")                                        \
 313           range(0, 100)                                                     \
 314                                                                             \
 315   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 316           "Do not reallocate more than this amount per collection")         \
 317           range(0, max_uintx)                                               \
 318                                                                             \
 319   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 320           "Enable adaptive chunk sizing for NUMA")                          \
 321                                                                             \
 322   product(bool, NUMAStats, false,                                           \
 323           "Print NUMA stats in detailed heap information")                  \
 324                                                                             \
 325   product(uintx, NUMAPageScanRate, 256,                                     \
 326           "Maximum number of pages to include in the page scan procedure")  \
 327           range(0, max_uintx)                                               \
 328                                                                             \
 329   product_pd(bool, NeedsDeoptSuspend,                                       \
 330           "True for register window machines (sparc/ia64)")                 \
 331                                                                             \
 332   product(intx, UseSSE, 99,                                                 \
 333           "Highest supported SSE instructions set on x86/x64")              \
 334           range(0, 99)                                                      \
 335                                                                             \
 336   product(bool, UseAES, false,                                              \
 337           "Control whether AES instructions are used when available")       \
 338                                                                             \
 339   product(bool, UseFMA, false,                                              \
 340           "Control whether FMA instructions are used when available")       \
 341                                                                             \
 342   product(bool, UseSHA, false,                                              \
 343           "Control whether SHA instructions are used when available")       \
 344                                                                             \
 345   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 346           "Use intrinsics for GHASH versions of crypto")                    \
 347                                                                             \
 348   product(bool, UseBASE64Intrinsics, false,                                 \
 349           "Use intrinsics for java.util.Base64")                            \
 350                                                                             \
 351   product(size_t, LargePageSizeInBytes, 0,                                  \
 352           "Large page size (0 to let VM choose the page size)")             \
 353           range(0, max_uintx)                                               \
 354                                                                             \
 355   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 356           "Use large pages if maximum heap is at least this big")           \
 357           range(0, max_uintx)                                               \
 358                                                                             \
 359   product(bool, ForceTimeHighResolution, false,                             \
 360           "Using high time resolution (for Win32 only)")                    \
 361                                                                             \
 362   develop(bool, TracePcPatching, false,                                     \
 363           "Trace usage of frame::patch_pc")                                 \
 364                                                                             \
 365   develop(bool, TraceRelocator, false,                                      \
 366           "Trace the bytecode relocator")                                   \
 367                                                                             \
 368   develop(bool, TraceLongCompiles, false,                                   \
 369           "Print out every time compilation is longer than "                \
 370           "a given threshold")                                              \
 371                                                                             \
 372   develop(bool, SafepointALot, false,                                       \
 373           "Generate a lot of safepoints. This works with "                  \
 374           "GuaranteedSafepointInterval")                                    \
 375                                                                             \
 376   product_pd(bool, BackgroundCompilation,                                   \
 377           "A thread requesting compilation is not blocked during "          \
 378           "compilation")                                                    \
 379                                                                             \
 380   product(bool, PrintVMQWaitTime, false,                                    \
 381           "Print out the waiting time in VM operation queue")               \
 382                                                                             \
 383   product(bool, MethodFlushing, true,                                       \
 384           "Reclamation of zombie and not-entrant methods")                  \
 385                                                                             \
 386   develop(bool, VerifyStack, false,                                         \
 387           "Verify stack of each thread when it is entering a runtime call") \
 388                                                                             \
 389   diagnostic(bool, ForceUnreachable, false,                                 \
 390           "Make all non code cache addresses to be unreachable by "         \
 391           "forcing use of 64bit literal fixups")                            \
 392                                                                             \
 393   notproduct(bool, StressDerivedPointers, false,                            \
 394           "Force scavenge when a derived pointer is detected on stack "     \
 395           "after rtm call")                                                 \
 396                                                                             \
 397   develop(bool, TraceDerivedPointers, false,                                \
 398           "Trace traversal of derived pointers on stack")                   \
 399                                                                             \
 400   notproduct(bool, TraceCodeBlobStacks, false,                              \
 401           "Trace stack-walk of codeblobs")                                  \
 402                                                                             \
 403   product(bool, PrintJNIResolving, false,                                   \
 404           "Used to implement -v:jni")                                       \
 405                                                                             \
 406   notproduct(bool, PrintRewrites, false,                                    \
 407           "Print methods that are being rewritten")                         \
 408                                                                             \
 409   product(bool, UseInlineCaches, true,                                      \
 410           "Use Inline Caches for virtual calls ")                           \
 411                                                                             \
 412   diagnostic(bool, InlineArrayCopy, true,                                   \
 413           "Inline arraycopy native that is known to be part of "            \
 414           "base library DLL")                                               \
 415                                                                             \
 416   diagnostic(bool, InlineObjectHash, true,                                  \
 417           "Inline Object::hashCode() native that is known to be part "      \
 418           "of base library DLL")                                            \
 419                                                                             \
 420   diagnostic(bool, InlineNatives, true,                                     \
 421           "Inline natives that are known to be part of base library DLL")   \
 422                                                                             \
 423   diagnostic(bool, InlineMathNatives, true,                                 \
 424           "Inline SinD, CosD, etc.")                                        \
 425                                                                             \
 426   diagnostic(bool, InlineClassNatives, true,                                \
 427           "Inline Class.isInstance, etc")                                   \
 428                                                                             \
 429   diagnostic(bool, InlineThreadNatives, true,                               \
 430           "Inline Thread.currentThread, etc")                               \
 431                                                                             \
 432   diagnostic(bool, InlineUnsafeOps, true,                                   \
 433           "Inline memory ops (native methods) from Unsafe")                 \
 434                                                                             \
 435   product(bool, CriticalJNINatives, true,                                   \
 436           "Check for critical JNI entry points")                            \
 437                                                                             \
 438   notproduct(bool, StressCriticalJNINatives, false,                         \
 439           "Exercise register saving code in critical natives")              \
 440                                                                             \
 441   diagnostic(bool, UseAESIntrinsics, false,                                 \
 442           "Use intrinsics for AES versions of crypto")                      \
 443                                                                             \
 444   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 445           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 446                                                                             \
 447   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 448           "Use intrinsics for SHA-1 crypto hash function. "                 \
 449           "Requires that UseSHA is enabled.")                               \
 450                                                                             \
 451   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 452           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 453           "Requires that UseSHA is enabled.")                               \
 454                                                                             \
 455   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 456           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 457           "Requires that UseSHA is enabled.")                               \
 458                                                                             \
 459   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 460           "use intrinsics for java.util.zip.CRC32")                         \
 461                                                                             \
 462   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 463           "use intrinsics for java.util.zip.CRC32C")                        \
 464                                                                             \
 465   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 466           "use intrinsics for java.util.zip.Adler32")                       \
 467                                                                             \
 468   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 469           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 470                                                                             \
 471   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 472          "do not expand intrinsics whose (internal) names appear here")     \
 473                                                                             \
 474   develop(bool, TraceCallFixup, false,                                      \
 475           "Trace all call fixups")                                          \
 476                                                                             \
 477   develop(bool, DeoptimizeALot, false,                                      \
 478           "Deoptimize at every exit from the runtime system")               \
 479                                                                             \
 480   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 481           "A comma separated list of bcis to deoptimize at")                \
 482                                                                             \
 483   product(bool, DeoptimizeRandom, false,                                    \
 484           "Deoptimize random frames on random exit from the runtime system")\
 485                                                                             \
 486   notproduct(bool, ZombieALot, false,                                       \
 487           "Create zombies (non-entrant) at exit from the runtime system")   \
 488                                                                             \
 489   notproduct(bool, WalkStackALot, false,                                    \
 490           "Trace stack (no print) at every exit from the runtime system")   \
 491                                                                             \
 492   product(bool, Debugging, false,                                           \
 493           "Set when executing debug methods in debug.cpp "                  \
 494           "(to prevent triggering assertions)")                             \
 495                                                                             \
 496   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 497           "Enable strict checks that safepoints cannot happen for threads " \
 498           "that use NoSafepointVerifier")                                   \
 499                                                                             \
 500   notproduct(bool, VerifyLastFrame, false,                                  \
 501           "Verify oops on last frame on entry to VM")                       \
 502                                                                             \
 503   product(bool, FailOverToOldVerifier, true,                                \
 504           "Fail over to old verifier when split verifier fails")            \
 505                                                                             \
 506   product(bool, SafepointTimeout, false,                                    \
 507           "Time out and warn or fail after SafepointTimeoutDelay "          \
 508           "milliseconds if failed to reach safepoint")                      \
 509                                                                             \
 510   develop(bool, DieOnSafepointTimeout, false,                               \
 511           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 512                                                                             \
 513   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 514   /* typically, at most a few retries are needed                    */      \
 515   product(intx, SuspendRetryCount, 50,                                      \
 516           "Maximum retry count for an external suspend request")            \
 517           range(0, max_intx)                                                \
 518                                                                             \
 519   product(intx, SuspendRetryDelay, 5,                                       \
 520           "Milliseconds to delay per retry (* current_retry_count)")        \
 521           range(0, max_intx)                                                \
 522                                                                             \
 523   product(bool, AssertOnSuspendWaitFailure, false,                          \
 524           "Assert/Guarantee on external suspend wait failure")              \
 525                                                                             \
 526   product(bool, TraceSuspendWaitFailures, false,                            \
 527           "Trace external suspend wait failures")                           \
 528                                                                             \
 529   product(bool, MaxFDLimit, true,                                           \
 530           "Bump the number of file descriptors to maximum in Solaris")      \
 531                                                                             \
 532   diagnostic(bool, LogEvents, true,                                         \
 533           "Enable the various ring buffer event logs")                      \
 534                                                                             \
 535   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 536           "Number of ring buffer event logs")                               \
 537           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 538                                                                             \
 539   product(bool, BytecodeVerificationRemote, true,                           \
 540           "Enable the Java bytecode verifier for remote classes")           \
 541                                                                             \
 542   product(bool, BytecodeVerificationLocal, false,                           \
 543           "Enable the Java bytecode verifier for local classes")            \
 544                                                                             \
 545   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 546           "Force exceptions on FP stack under/overflow")                    \
 547                                                                             \
 548   develop(bool, VerifyStackAtCalls, false,                                  \
 549           "Verify that the stack pointer is unchanged after calls")         \
 550                                                                             \
 551   develop(bool, TraceJavaAssertions, false,                                 \
 552           "Trace java language assertions")                                 \
 553                                                                             \
 554   notproduct(bool, VerifyCodeCache, false,                                  \
 555           "Verify code cache on memory allocation/deallocation")            \
 556                                                                             \
 557   develop(bool, UseMallocOnly, false,                                       \
 558           "Use only malloc/free for allocation (no resource area/arena)")   \
 559                                                                             \
 560   develop(bool, PrintMallocStatistics, false,                               \
 561           "Print malloc/free statistics")                                   \
 562                                                                             \
 563   develop(bool, ZapResourceArea, trueInDebug,                               \
 564           "Zap freed resource/arena space with 0xABABABAB")                 \
 565                                                                             \
 566   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 567           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 568                                                                             \
 569   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 570           "Zap allocated/freed stack segments with 0xFADFADED")             \
 571                                                                             \
 572   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 573           "Zap unused heap space with 0xBAADBABE")                          \
 574                                                                             \
 575   develop(bool, CheckZapUnusedHeapArea, false,                              \
 576           "Check zapping of unused heap space")                             \
 577                                                                             \
 578   develop(bool, ZapFillerObjects, trueInDebug,                              \
 579           "Zap filler objects with 0xDEAFBABE")                             \
 580                                                                             \
 581   develop(bool, PrintVMMessages, true,                                      \
 582           "Print VM messages on console")                                   \
 583                                                                             \
 584   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 585           "If > 0, provokes an error after VM initialization; the value "   \
 586           "determines which error to provoke. See test_error_handler() "    \
 587           "in vmError.cpp.")                                                \
 588                                                                             \
 589   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 590           "If > 0, provokes an error inside VM error handler (a secondary " \
 591           "crash). see test_error_handler() in vmError.cpp")                \
 592                                                                             \
 593   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 594           "If true, tests SafeFetch inside error handler.")                 \
 595                                                                             \
 596   notproduct(bool, TestUnresponsiveErrorHandler, false,                     \
 597           "If true, simulates an unresponsive error handler.")              \
 598                                                                             \
 599   develop(bool, Verbose, false,                                             \
 600           "Print additional debugging information from other modes")        \
 601                                                                             \
 602   develop(bool, PrintMiscellaneous, false,                                  \
 603           "Print uncategorized debugging information (requires +Verbose)")  \
 604                                                                             \
 605   develop(bool, WizardMode, false,                                          \
 606           "Print much more debugging information")                          \
 607                                                                             \
 608   product(bool, ShowMessageBoxOnError, false,                               \
 609           "Keep process alive on VM fatal error")                           \
 610                                                                             \
 611   product(bool, CreateCoredumpOnCrash, true,                                \
 612           "Create core/mini dump on VM fatal error")                        \
 613                                                                             \
 614   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
 615           "Timeout, in seconds, to limit the time spent on writing an "     \
 616           "error log in case of a crash.")                                  \
 617           range(0, (uint64_t)max_jlong/1000)                                \
 618                                                                             \
 619   product_pd(bool, UseOSErrorReporting,                                     \
 620           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 621                                                                             \
 622   product(bool, SuppressFatalErrorMessage, false,                           \
 623           "Report NO fatal error message (avoid deadlock)")                 \
 624                                                                             \
 625   product(ccstrlist, OnError, "",                                           \
 626           "Run user-defined commands on fatal error; see VMError.cpp "      \
 627           "for examples")                                                   \
 628                                                                             \
 629   product(ccstrlist, OnOutOfMemoryError, "",                                \
 630           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 631                                                                             \
 632   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 633           "Dump heap to file before any major stop-the-world GC")           \
 634                                                                             \
 635   manageable(bool, HeapDumpAfterFullGC, false,                              \
 636           "Dump heap to file after any major stop-the-world GC")            \
 637                                                                             \
 638   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 639           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 640                                                                             \
 641   manageable(ccstr, HeapDumpPath, NULL,                                     \
 642           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 643           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 644           "in the working directory)")                                      \
 645                                                                             \
 646   develop(bool, BreakAtWarning, false,                                      \
 647           "Execute breakpoint upon encountering VM warning")                \
 648                                                                             \
 649   develop(bool, UseFakeTimers, false,                                       \
 650           "Tell whether the VM should use system time or a fake timer")     \
 651                                                                             \
 652   product(ccstr, NativeMemoryTracking, "off",                               \
 653           "Native memory tracking options")                                 \
 654                                                                             \
 655   diagnostic(bool, PrintNMTStatistics, false,                               \
 656           "Print native memory tracking summary data if it is on")          \
 657                                                                             \
 658   diagnostic(bool, LogCompilation, false,                                   \
 659           "Log compilation activity in detail to LogFile")                  \
 660                                                                             \
 661   product(bool, PrintCompilation, false,                                    \
 662           "Print compilations")                                             \
 663                                                                             \
 664   product(bool, PrintExtendedThreadInfo, false,                             \
 665           "Print more information in thread dump")                          \
 666                                                                             \
 667   diagnostic(bool, TraceNMethodInstalls, false,                             \
 668           "Trace nmethod installation")                                     \
 669                                                                             \
 670   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 671           "0: do not allow scavengable oops in the code cache; "            \
 672           "1: allow scavenging from the code cache; "                       \
 673           "2: emit as many constants as the compiler can see")              \
 674           range(0, 2)                                                       \
 675                                                                             \
 676   product(bool, AlwaysRestoreFPU, false,                                    \
 677           "Restore the FPU control word after every JNI call (expensive)")  \
 678                                                                             \
 679   diagnostic(bool, PrintCompilation2, false,                                \
 680           "Print additional statistics per compilation")                    \
 681                                                                             \
 682   diagnostic(bool, PrintAdapterHandlers, false,                             \
 683           "Print code generated for i2c/c2i adapters")                      \
 684                                                                             \
 685   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 686           "Verify that i2c/c2i adapters are called properly")               \
 687                                                                             \
 688   develop(bool, VerifyAdapterSharing, false,                                \
 689           "Verify that the code for shared adapters is the equivalent")     \
 690                                                                             \
 691   diagnostic(bool, PrintAssembly, false,                                    \
 692           "Print assembly code (using external disassembler.so)")           \
 693                                                                             \
 694   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 695           "Print options string passed to disassembler.so")                 \
 696                                                                             \
 697   notproduct(bool, PrintNMethodStatistics, false,                           \
 698           "Print a summary statistic for the generated nmethods")           \
 699                                                                             \
 700   diagnostic(bool, PrintNMethods, false,                                    \
 701           "Print assembly code for nmethods when generated")                \
 702                                                                             \
 703   diagnostic(bool, PrintNativeNMethods, false,                              \
 704           "Print assembly code for native nmethods when generated")         \
 705                                                                             \
 706   develop(bool, PrintDebugInfo, false,                                      \
 707           "Print debug information for all nmethods when generated")        \
 708                                                                             \
 709   develop(bool, PrintRelocations, false,                                    \
 710           "Print relocation information for all nmethods when generated")   \
 711                                                                             \
 712   develop(bool, PrintDependencies, false,                                   \
 713           "Print dependency information for all nmethods when generated")   \
 714                                                                             \
 715   develop(bool, PrintExceptionHandlers, false,                              \
 716           "Print exception handler tables for all nmethods when generated") \
 717                                                                             \
 718   develop(bool, StressCompiledExceptionHandlers, false,                     \
 719           "Exercise compiled exception handlers")                           \
 720                                                                             \
 721   develop(bool, InterceptOSException, false,                                \
 722           "Start debugger when an implicit OS (e.g. NULL) "                 \
 723           "exception happens")                                              \
 724                                                                             \
 725   product(bool, PrintCodeCache, false,                                      \
 726           "Print the code cache memory usage when exiting")                 \
 727                                                                             \
 728   develop(bool, PrintCodeCache2, false,                                     \
 729           "Print detailed usage information on the code cache when exiting")\
 730                                                                             \
 731   product(bool, PrintCodeCacheOnCompilation, false,                         \
 732           "Print the code cache memory usage each time a method is "        \
 733           "compiled")                                                       \
 734                                                                             \
 735   diagnostic(bool, PrintStubCode, false,                                    \
 736           "Print generated stub code")                                      \
 737                                                                             \
 738   product(bool, StackTraceInThrowable, true,                                \
 739           "Collect backtrace in throwable when exception happens")          \
 740                                                                             \
 741   product(bool, OmitStackTraceInFastThrow, true,                            \
 742           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 743                                                                             \
 744   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 745           "Print bytecode statistics when dumping profiler output")         \
 746                                                                             \
 747   product(bool, ProfilerRecordPC, false,                                    \
 748           "Collect ticks for each 16 byte interval of compiled code")       \
 749                                                                             \
 750   product(bool, ProfileVM, false,                                           \
 751           "Profile ticks that fall within VM (either in the VM Thread "     \
 752           "or VM code called through stubs)")                               \
 753                                                                             \
 754   product(bool, ProfileIntervals, false,                                    \
 755           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
 756                                                                             \
 757   notproduct(bool, ProfilerCheckIntervals, false,                           \
 758           "Collect and print information on spacing of profiler ticks")     \
 759                                                                             \
 760   product(bool, PrintWarnings, true,                                        \
 761           "Print JVM warnings to output stream")                            \
 762                                                                             \
 763   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 764           "Print warnings for stalled SpinLocks")                           \
 765                                                                             \
 766   product(bool, RegisterFinalizersAtInit, true,                             \
 767           "Register finalizable objects at end of Object.<init> or "        \
 768           "after allocation")                                               \
 769                                                                             \
 770   develop(bool, RegisterReferences, true,                                   \
 771           "Tell whether the VM should register soft/weak/final/phantom "    \
 772           "references")                                                     \
 773                                                                             \
 774   develop(bool, IgnoreRewrites, false,                                      \
 775           "Suppress rewrites of bytecodes in the oopmap generator. "        \
 776           "This is unsafe!")                                                \
 777                                                                             \
 778   develop(bool, PrintCodeCacheExtension, false,                             \
 779           "Print extension of code cache")                                  \
 780                                                                             \
 781   develop(bool, UsePrivilegedStack, true,                                   \
 782           "Enable the security JVM functions")                              \
 783                                                                             \
 784   develop(bool, ProtectionDomainVerification, true,                         \
 785           "Verify protection domain before resolution in system dictionary")\
 786                                                                             \
 787   product(bool, ClassUnloading, true,                                       \
 788           "Do unloading of classes")                                        \
 789                                                                             \
 790   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
 791           "Do unloading of classes with a concurrent marking cycle")        \
 792                                                                             \
 793   develop(bool, DisableStartThread, false,                                  \
 794           "Disable starting of additional Java threads "                    \
 795           "(for debugging only)")                                           \
 796                                                                             \
 797   develop(bool, MemProfiling, false,                                        \
 798           "Write memory usage profiling to log file")                       \
 799                                                                             \
 800   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 801           "Print the system dictionary at exit")                            \
 802                                                                             \
 803   diagnostic(bool, DynamicallyResizeSystemDictionaries, true,               \
 804           "Dynamically resize system dictionaries as needed")               \
 805                                                                             \
 806   product(bool, AlwaysLockClassLoader, false,                               \
 807           "Require the VM to acquire the class loader lock before calling " \
 808           "loadClass() even for class loaders registering "                 \
 809           "as parallel capable")                                            \
 810                                                                             \
 811   product(bool, AllowParallelDefineClass, false,                            \
 812           "Allow parallel defineClass requests for class loaders "          \
 813           "registering as parallel capable")                                \
 814                                                                             \
 815   product_pd(bool, DontYieldALot,                                           \
 816           "Throw away obvious excess yield calls")                          \
 817                                                                             \
 818   develop(bool, UseDetachedThreads, true,                                   \
 819           "Use detached threads that are recycled upon termination "        \
 820           "(for Solaris only)")                                             \
 821                                                                             \
 822   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
 823                "Disable the use of stack guard pages if the JVM is loaded " \
 824                "on the primordial process thread")                          \
 825                                                                             \
 826   product(bool, UseLWPSynchronization, true,                                \
 827           "Use LWP-based instead of libthread-based synchronization "       \
 828           "(SPARC only)")                                                   \
 829                                                                             \
 830   experimental(ccstr, SyncKnobs, NULL,                                      \
 831                "(Unstable) Various monitor synchronization tunables")       \
 832                                                                             \
 833   experimental(intx, EmitSync, 0,                                           \
 834                "(Unsafe, Unstable) "                                        \
 835                "Control emission of inline sync fast-path code")            \
 836                                                                             \
 837   product(intx, MonitorBound, 0, "Bound Monitor population")                \
 838           range(0, max_jint)                                                \
 839                                                                             \
 840   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
 841                                                                             \
 842   experimental(intx, MonitorUsedDeflationThreshold, 90,                     \
 843                 "Percentage of used monitors before triggering cleanup "    \
 844                 "safepoint which deflates monitors (0 is off). "            \
 845                 "The check is performed on GuaranteedSafepointInterval.")   \
 846                 range(0, 100)                                               \
 847                                                                             \
 848   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
 849                "Experimental Sync flags")                                   \
 850                                                                             \
 851   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
 852                                                                             \
 853   experimental(intx, hashCode, 5,                                           \
 854                "(Unstable) select hashCode generation algorithm")           \
 855                                                                             \
 856   product(bool, FilterSpuriousWakeups, true,                                \
 857           "When true prevents OS-level spurious, or premature, wakeups "    \
 858           "from Object.wait (Ignored for Windows)")                         \
 859                                                                             \
 860   develop(bool, UsePthreads, false,                                         \
 861           "Use pthread-based instead of libthread-based synchronization "   \
 862           "(SPARC only)")                                                   \
 863                                                                             \
 864   product(bool, ReduceSignalUsage, false,                                   \
 865           "Reduce the use of OS signals in Java and/or the VM")             \
 866                                                                             \
 867   develop_pd(bool, ShareVtableStubs,                                        \
 868           "Share vtable stubs (smaller code but worse branch prediction")   \
 869                                                                             \
 870   develop(bool, LoadLineNumberTables, true,                                 \
 871           "Tell whether the class file parser loads line number tables")    \
 872                                                                             \
 873   develop(bool, LoadLocalVariableTables, true,                              \
 874           "Tell whether the class file parser loads local variable tables") \
 875                                                                             \
 876   develop(bool, LoadLocalVariableTypeTables, true,                          \
 877           "Tell whether the class file parser loads local variable type"    \
 878           "tables")                                                         \
 879                                                                             \
 880   product(bool, AllowUserSignalHandlers, false,                             \
 881           "Do not complain if the application installs signal handlers "    \
 882           "(Solaris & Linux only)")                                         \
 883                                                                             \
 884   product(bool, UseSignalChaining, true,                                    \
 885           "Use signal-chaining to invoke signal handlers installed "        \
 886           "by the application (Solaris & Linux only)")                      \
 887                                                                             \
 888   product(bool, AllowJNIEnvProxy, false,                                    \
 889           "Allow JNIEnv proxies for jdbx")                                  \
 890                                                                             \
 891   product(bool, RestoreMXCSROnJNICalls, false,                              \
 892           "Restore MXCSR when returning from JNI calls")                    \
 893                                                                             \
 894   product(bool, CheckJNICalls, false,                                       \
 895           "Verify all arguments to JNI calls")                              \
 896                                                                             \
 897   product(bool, UseFastJNIAccessors, true,                                  \
 898           "Use optimized versions of Get<Primitive>Field")                  \
 899                                                                             \
 900   product(intx, MaxJNILocalCapacity, 65536,                                 \
 901           "Maximum allowable local JNI handle capacity to "                 \
 902           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
 903           "where <= 0 is unlimited, default: 65536")                        \
 904           range(min_intx, max_intx)                                         \
 905                                                                             \
 906   product(bool, EagerXrunInit, false,                                       \
 907           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 908           "but not all -Xrun libraries may support the state of the VM "    \
 909           "at this time")                                                   \
 910                                                                             \
 911   product(bool, PreserveAllAnnotations, false,                              \
 912           "Preserve RuntimeInvisibleAnnotations as well "                   \
 913           "as RuntimeVisibleAnnotations")                                   \
 914                                                                             \
 915   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 916           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 917                                                                             \
 918   product(bool, UseXMMForArrayCopy, false,                                  \
 919           "Use SSE2 MOVQ instruction for Arraycopy")                        \
 920                                                                             \
 921   product(intx, FieldsAllocationStyle, 1,                                   \
 922           "0 - type based with oops first, "                                \
 923           "1 - with oops last, "                                            \
 924           "2 - oops in super and sub classes are together")                 \
 925           range(0, 2)                                                       \
 926                                                                             \
 927   product(bool, CompactFields, true,                                        \
 928           "Allocate nonstatic fields in gaps between previous fields")      \
 929                                                                             \
 930   notproduct(bool, PrintFieldLayout, false,                                 \
 931           "Print field layout for each class")                              \
 932                                                                             \
 933   notproduct(bool, PrintValueLayout, false,                                 \
 934           "Print field layout for each value type")                         \
 935                                                                             \
 936   notproduct(bool, PrintValueArrayLayout, false,                            \
 937           "Print array layout for each value type array")                   \
 938                                                                             \
 939   product(bool, ValueArrayFlatten, true,                                    \
 940           "Flatten value array elements, if possible")                      \
 941                                                                             \
 942   product(intx, ValueArrayElemMaxFlatSize, -1,                              \
 943           "Max size for flattening value array elements, <0 no limit")      \
 944                                                                             \
 945   product(intx, ValueFieldMaxFlatSize, 128,                                 \
 946           "Max size for flattening value type fields, <0 no limit")         \
 947                                                                             \
 948   product(intx, ValueArrayElemMaxFlatOops, 4,                               \
 949           "Max nof embedded object references in a value type to flatten, <0 no limit")  \
 950                                                                             \
 951   product(bool, ValueArrayAtomicAccess, false,                              \
 952           "Atomic value array accesses by-default, for all value arrays")   \
 953                                                                             \
 954   /* Need to limit the extent of the padding to reasonable size.          */\
 955   /* 8K is well beyond the reasonable HW cache line size, even with       */\
 956   /* aggressive prefetching, while still leaving the room for segregating */\
 957   /* among the distinct pages.                                            */\
 958   product(intx, ContendedPaddingWidth, 128,                                 \
 959           "How many bytes to pad the fields/classes marked @Contended with")\
 960           range(0, 8192)                                                    \
 961           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
 962                                                                             \
 963   product(bool, EnableContended, true,                                      \
 964           "Enable @Contended annotation support")                           \
 965                                                                             \
 966   product(bool, RestrictContended, true,                                    \
 967           "Restrict @Contended to trusted classes")                         \
 968                                                                             \
 969   product(bool, UseBiasedLocking, true,                                     \
 970           "Enable biased locking in JVM")                                   \
 971                                                                             \
 972   product(intx, BiasedLockingStartupDelay, 0,                               \
 973           "Number of milliseconds to wait before enabling biased locking")  \
 974           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
 975           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
 976                                                                             \
 977   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
 978           "Print statistics of biased locking in JVM")                      \
 979                                                                             \
 980   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
 981           "Threshold of number of revocations per type to try to "          \
 982           "rebias all objects in the heap of that type")                    \
 983           range(0, max_intx)                                                \
 984           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
 985                                                                             \
 986   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
 987           "Threshold of number of revocations per type to permanently "     \
 988           "revoke biases of all objects in the heap of that type")          \
 989           range(0, max_intx)                                                \
 990           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
 991                                                                             \
 992   product(intx, BiasedLockingDecayTime, 25000,                              \
 993           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
 994           "type after previous bulk rebias")                                \
 995           range(500, max_intx)                                              \
 996           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
 997                                                                             \
 998   product(bool, ExitOnOutOfMemoryError, false,                              \
 999           "JVM exits on the first occurrence of an out-of-memory error")    \
1000                                                                             \
1001   product(bool, CrashOnOutOfMemoryError, false,                             \
1002           "JVM aborts, producing an error log and core/mini dump, on the "  \
1003           "first occurrence of an out-of-memory error")                     \
1004                                                                             \
1005   /* tracing */                                                             \
1006                                                                             \
1007   develop(bool, StressRewriter, false,                                      \
1008           "Stress linktime bytecode rewriting")                             \
1009                                                                             \
1010   product(ccstr, TraceJVMTI, NULL,                                          \
1011           "Trace flags for JVMTI functions and events")                     \
1012                                                                             \
1013   /* This option can change an EMCP method into an obsolete method. */      \
1014   /* This can affect tests that except specific methods to be EMCP. */      \
1015   /* This option should be used with caution.                       */      \
1016   product(bool, StressLdcRewrite, false,                                    \
1017           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1018                                                                             \
1019   /* change to false by default sometime after Mustang */                   \
1020   product(bool, VerifyMergedCPBytecodes, true,                              \
1021           "Verify bytecodes after RedefineClasses constant pool merging")   \
1022                                                                             \
1023   develop(bool, TraceBytecodes, false,                                      \
1024           "Trace bytecode execution")                                       \
1025                                                                             \
1026   develop(bool, TraceICs, false,                                            \
1027           "Trace inline cache changes")                                     \
1028                                                                             \
1029   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1030           "Trace method invocation counter overflow")                       \
1031                                                                             \
1032   develop(bool, TraceInlineCacheClearing, false,                            \
1033           "Trace clearing of inline caches in nmethods")                    \
1034                                                                             \
1035   develop(bool, TraceDependencies, false,                                   \
1036           "Trace dependencies")                                             \
1037                                                                             \
1038   develop(bool, VerifyDependencies, trueInDebug,                            \
1039           "Exercise and verify the compilation dependency mechanism")       \
1040                                                                             \
1041   develop(bool, TraceNewOopMapGeneration, false,                            \
1042           "Trace OopMapGeneration")                                         \
1043                                                                             \
1044   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1045           "Trace OopMapGeneration: print detailed cell states")             \
1046                                                                             \
1047   develop(bool, TimeOopMap, false,                                          \
1048           "Time calls to GenerateOopMap::compute_map() in sum")             \
1049                                                                             \
1050   develop(bool, TimeOopMap2, false,                                         \
1051           "Time calls to GenerateOopMap::compute_map() individually")       \
1052                                                                             \
1053   develop(bool, TraceOopMapRewrites, false,                                 \
1054           "Trace rewriting of method oops during oop map generation")       \
1055                                                                             \
1056   develop(bool, TraceICBuffer, false,                                       \
1057           "Trace usage of IC buffer")                                       \
1058                                                                             \
1059   develop(bool, TraceCompiledIC, false,                                     \
1060           "Trace changes of compiled IC")                                   \
1061                                                                             \
1062   develop(bool, FLSVerifyDictionary, false,                                 \
1063           "Do lots of (expensive) FLS dictionary verification")             \
1064                                                                             \
1065                                                                             \
1066   notproduct(bool, CheckMemoryInitialization, false,                        \
1067           "Check memory initialization")                                    \
1068                                                                             \
1069   product(uintx, ProcessDistributionStride, 4,                              \
1070           "Stride through processors when distributing processes")          \
1071           range(0, max_juint)                                               \
1072                                                                             \
1073   develop(bool, TraceFinalizerRegistration, false,                          \
1074           "Trace registration of final references")                         \
1075                                                                             \
1076   product(bool, IgnoreEmptyClassPaths, false,                               \
1077           "Ignore empty path elements in -classpath")                       \
1078                                                                             \
1079   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
1080           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
1081           "Initial size of the boot class loader data metaspace")           \
1082           range(30*K, max_uintx/BytesPerWord)                               \
1083           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
1084                                                                             \
1085   product(bool, PrintHeapAtSIGBREAK, true,                                  \
1086           "Print heap layout in response to SIGBREAK")                      \
1087                                                                             \
1088   manageable(bool, PrintClassHistogram, false,                              \
1089           "Print a histogram of class instances")                           \
1090                                                                             \
1091   develop(bool, IgnoreLibthreadGPFault, false,                              \
1092           "Suppress workaround for libthread GP fault")                     \
1093                                                                             \
1094   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
1095           "The percentage of the used heap that the instances of a class "  \
1096           "must occupy for the class to generate a trace event")            \
1097           range(0.0, 100.0)                                                 \
1098                                                                             \
1099   /* JVMTI heap profiling */                                                \
1100                                                                             \
1101   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
1102           "Trace JVMTI object tagging calls")                               \
1103                                                                             \
1104   diagnostic(bool, VerifyBeforeIteration, false,                            \
1105           "Verify memory system before JVMTI iteration")                    \
1106                                                                             \
1107   /* compiler interface */                                                  \
1108                                                                             \
1109   develop(bool, CIPrintCompilerName, false,                                 \
1110           "when CIPrint is active, print the name of the active compiler")  \
1111                                                                             \
1112   diagnostic(bool, CIPrintCompileQueue, false,                              \
1113           "display the contents of the compile queue whenever a "           \
1114           "compilation is enqueued")                                        \
1115                                                                             \
1116   develop(bool, CIPrintRequests, false,                                     \
1117           "display every request for compilation")                          \
1118                                                                             \
1119   product(bool, CITime, false,                                              \
1120           "collect timing information for compilation")                     \
1121                                                                             \
1122   develop(bool, CITimeVerbose, false,                                       \
1123           "be more verbose in compilation timings")                         \
1124                                                                             \
1125   develop(bool, CITimeEach, false,                                          \
1126           "display timing information after each successful compilation")   \
1127                                                                             \
1128   develop(bool, CICountOSR, false,                                          \
1129           "use a separate counter when assigning ids to osr compilations")  \
1130                                                                             \
1131   develop(bool, CICompileNatives, true,                                     \
1132           "compile native methods if supported by the compiler")            \
1133                                                                             \
1134   develop_pd(bool, CICompileOSR,                                            \
1135           "compile on stack replacement methods if supported by the "       \
1136           "compiler")                                                       \
1137                                                                             \
1138   develop(bool, CIPrintMethodCodes, false,                                  \
1139           "print method bytecodes of the compiled code")                    \
1140                                                                             \
1141   develop(bool, CIPrintTypeFlow, false,                                     \
1142           "print the results of ciTypeFlow analysis")                       \
1143                                                                             \
1144   develop(bool, CITraceTypeFlow, false,                                     \
1145           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
1146                                                                             \
1147   develop(intx, OSROnlyBCI, -1,                                             \
1148           "OSR only at this bci.  Negative values mean exclude that bci")   \
1149                                                                             \
1150   /* compiler */                                                            \
1151                                                                             \
1152   /* notice: the max range value here is max_jint, not max_intx  */         \
1153   /* because of overflow issue                                   */         \
1154   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
1155           "Number of compiler threads to run")                              \
1156           range(0, max_jint)                                                \
1157           constraint(CICompilerCountConstraintFunc, AfterErgo)              \
1158                                                                             \
1159   product(bool, UseDynamicNumberOfCompilerThreads, true,                    \
1160           "Dynamically choose the number of parallel compiler threads")     \
1161                                                                             \
1162   diagnostic(bool, ReduceNumberOfCompilerThreads, true,                     \
1163              "Reduce the number of parallel compiler threads when they "    \
1164              "are not used")                                                \
1165                                                                             \
1166   diagnostic(bool, TraceCompilerThreads, false,                             \
1167              "Trace creation and removal of compiler threads")              \
1168                                                                             \
1169   develop(bool, InjectCompilerCreationFailure, false,                       \
1170           "Inject thread creation failures for "                            \
1171           "UseDynamicNumberOfCompilerThreads")                              \
1172                                                                             \
1173   product(intx, CompilationPolicyChoice, 0,                                 \
1174           "which compilation policy (0-2)")                                 \
1175           range(0, 2)                                                       \
1176                                                                             \
1177   develop(bool, UseStackBanging, true,                                      \
1178           "use stack banging for stack overflow checks (required for "      \
1179           "proper StackOverflow handling; disable only to measure cost "    \
1180           "of stackbanging)")                                               \
1181                                                                             \
1182   develop(bool, UseStrictFP, true,                                          \
1183           "use strict fp if modifier strictfp is set")                      \
1184                                                                             \
1185   develop(bool, GenerateSynchronizationCode, true,                          \
1186           "generate locking/unlocking code for synchronized methods and "   \
1187           "monitors")                                                       \
1188                                                                             \
1189   develop(bool, GenerateRangeChecks, true,                                  \
1190           "Generate range checks for array accesses")                       \
1191                                                                             \
1192   diagnostic_pd(bool, ImplicitNullChecks,                                   \
1193           "Generate code for implicit null checks")                         \
1194                                                                             \
1195   product_pd(bool, TrapBasedNullChecks,                                     \
1196           "Generate code for null checks that uses a cmp and trap "         \
1197           "instruction raising SIGTRAP.  This is only used if an access to" \
1198           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
1199           "ImplicitNullChecks don't work (PPC64).")                         \
1200                                                                             \
1201   diagnostic(bool, EnableThreadSMRExtraValidityChecks, true,                \
1202              "Enable Thread SMR extra validity checks")                     \
1203                                                                             \
1204   diagnostic(bool, EnableThreadSMRStatistics, trueInDebug,                  \
1205              "Enable Thread SMR Statistics")                                \
1206                                                                             \
1207   product(bool, Inline, true,                                               \
1208           "Enable inlining")                                                \
1209                                                                             \
1210   product(bool, ClipInlining, true,                                         \
1211           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
1212                                                                             \
1213   develop(bool, UseCHA, true,                                               \
1214           "Enable CHA")                                                     \
1215                                                                             \
1216   product(bool, UseTypeProfile, true,                                       \
1217           "Check interpreter profile for historically monomorphic calls")   \
1218                                                                             \
1219   diagnostic(bool, PrintInlining, false,                                    \
1220           "Print inlining optimizations")                                   \
1221                                                                             \
1222   product(bool, UsePopCountInstruction, false,                              \
1223           "Use population count instruction")                               \
1224                                                                             \
1225   develop(bool, EagerInitialization, false,                                 \
1226           "Eagerly initialize classes if possible")                         \
1227                                                                             \
1228   diagnostic(bool, LogTouchedMethods, false,                                \
1229           "Log methods which have been ever touched in runtime")            \
1230                                                                             \
1231   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
1232           "Print all methods that have been ever touched in runtime")       \
1233                                                                             \
1234   develop(bool, TraceMethodReplacement, false,                              \
1235           "Print when methods are replaced do to recompilation")            \
1236                                                                             \
1237   develop(bool, PrintMethodFlushing, false,                                 \
1238           "Print the nmethods being flushed")                               \
1239                                                                             \
1240   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
1241           "print statistics about method flushing")                         \
1242                                                                             \
1243   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
1244           "Number of compiled code invocations after which "                \
1245           "the method is considered as hot by the flusher")                 \
1246           range(1, max_jint)                                                \
1247                                                                             \
1248   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
1249           "Minimum number of sweeper passes before an nmethod "             \
1250           "can be flushed")                                                 \
1251           range(0, max_intx)                                                \
1252                                                                             \
1253   product(bool, UseCodeAging, true,                                         \
1254           "Insert counter to detect warm methods")                          \
1255                                                                             \
1256   diagnostic(bool, StressCodeAging, false,                                  \
1257           "Start with counters compiled in")                                \
1258                                                                             \
1259   develop(bool, StressCodeBuffers, false,                                   \
1260           "Exercise code buffer expansion and other rare state changes")    \
1261                                                                             \
1262   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
1263           "Generate extra debugging information for non-safepoints in "     \
1264           "nmethods")                                                       \
1265                                                                             \
1266   product(bool, PrintVMOptions, false,                                      \
1267           "Print flags that appeared on the command line")                  \
1268                                                                             \
1269   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
1270           "Ignore unrecognized VM options")                                 \
1271                                                                             \
1272   product(bool, PrintCommandLineFlags, false,                               \
1273           "Print flags specified on command line or set by ergonomics")     \
1274                                                                             \
1275   product(bool, PrintFlagsInitial, false,                                   \
1276           "Print all VM flags before argument processing and exit VM")      \
1277                                                                             \
1278   product(bool, PrintFlagsFinal, false,                                     \
1279           "Print all VM flags after argument and ergonomic processing")     \
1280                                                                             \
1281   notproduct(bool, PrintFlagsWithComments, false,                           \
1282           "Print all VM flags with default values and descriptions and "    \
1283           "exit")                                                           \
1284                                                                             \
1285   product(bool, PrintFlagsRanges, false,                                    \
1286           "Print VM flags and their ranges and exit VM")                    \
1287                                                                             \
1288   diagnostic(bool, SerializeVMOutput, true,                                 \
1289           "Use a mutex to serialize output to tty and LogFile")             \
1290                                                                             \
1291   diagnostic(bool, DisplayVMOutput, true,                                   \
1292           "Display all VM output on the tty, independently of LogVMOutput") \
1293                                                                             \
1294   diagnostic(bool, LogVMOutput, false,                                      \
1295           "Save VM output to LogFile")                                      \
1296                                                                             \
1297   diagnostic(ccstr, LogFile, NULL,                                          \
1298           "If LogVMOutput or LogCompilation is on, save VM output to "      \
1299           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
1300                                                                             \
1301   product(ccstr, ErrorFile, NULL,                                           \
1302           "If an error occurs, save the error data to this file "           \
1303           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
1304                                                                             \
1305   product(bool, DisplayVMOutputToStderr, false,                             \
1306           "If DisplayVMOutput is true, display all VM output to stderr")    \
1307                                                                             \
1308   product(bool, DisplayVMOutputToStdout, false,                             \
1309           "If DisplayVMOutput is true, display all VM output to stdout")    \
1310                                                                             \
1311   product(bool, UseHeavyMonitors, false,                                    \
1312           "use heavyweight instead of lightweight Java monitors")           \
1313                                                                             \
1314   product(bool, PrintStringTableStatistics, false,                          \
1315           "print statistics about the StringTable and SymbolTable")         \
1316                                                                             \
1317   diagnostic(bool, VerifyStringTableAtExit, false,                          \
1318           "verify StringTable contents at exit")                            \
1319                                                                             \
1320   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
1321           "print histogram of the symbol table")                            \
1322                                                                             \
1323   notproduct(bool, ExitVMOnVerifyError, false,                              \
1324           "standard exit from VM if bytecode verify error "                 \
1325           "(only in debug mode)")                                           \
1326                                                                             \
1327   diagnostic(ccstr, AbortVMOnException, NULL,                               \
1328           "Call fatal if this exception is thrown.  Example: "              \
1329           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
1330                                                                             \
1331   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
1332           "Call fatal if the exception pointed by AbortVMOnException "      \
1333           "has this message")                                               \
1334                                                                             \
1335   develop(bool, DebugVtables, false,                                        \
1336           "add debugging code to vtable dispatch")                          \
1337                                                                             \
1338   notproduct(bool, PrintVtableStats, false,                                 \
1339           "print vtables stats at end of run")                              \
1340                                                                             \
1341   develop(bool, TraceCreateZombies, false,                                  \
1342           "trace creation of zombie nmethods")                              \
1343                                                                             \
1344   notproduct(bool, IgnoreLockingAssertions, false,                          \
1345           "disable locking assertions (for speed)")                         \
1346                                                                             \
1347   product(bool, RangeCheckElimination, true,                                \
1348           "Eliminate range checks")                                         \
1349                                                                             \
1350   develop_pd(bool, UncommonNullCast,                                        \
1351           "track occurrences of null in casts; adjust compiler tactics")    \
1352                                                                             \
1353   develop(bool, TypeProfileCasts,  true,                                    \
1354           "treat casts like calls for purposes of type profiling")          \
1355                                                                             \
1356   develop(bool, DelayCompilationDuringStartup, true,                        \
1357           "Delay invoking the compiler until main application class is "    \
1358           "loaded")                                                         \
1359                                                                             \
1360   develop(bool, CompileTheWorld, false,                                     \
1361           "Compile all methods in all classes in bootstrap class path "     \
1362             "(stress test)")                                                \
1363                                                                             \
1364   develop(bool, CompileTheWorldPreloadClasses, true,                        \
1365           "Preload all classes used by a class before start loading")       \
1366                                                                             \
1367   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
1368           "Force a safepoint every n compiles so sweeper can keep up")      \
1369                                                                             \
1370   develop(bool, FillDelaySlots, true,                                       \
1371           "Fill delay slots (on SPARC only)")                               \
1372                                                                             \
1373   develop(bool, TimeLivenessAnalysis, false,                                \
1374           "Time computation of bytecode liveness analysis")                 \
1375                                                                             \
1376   develop(bool, TraceLivenessGen, false,                                    \
1377           "Trace the generation of liveness analysis information")          \
1378                                                                             \
1379   notproduct(bool, TraceLivenessQuery, false,                               \
1380           "Trace queries of liveness analysis information")                 \
1381                                                                             \
1382   notproduct(bool, CollectIndexSetStatistics, false,                        \
1383           "Collect information about IndexSets")                            \
1384                                                                             \
1385   develop(bool, UseLoopSafepoints, true,                                    \
1386           "Generate Safepoint nodes in every loop")                         \
1387                                                                             \
1388   develop(intx, FastAllocateSizeLimit, 128*K,                               \
1389           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
1390           "Inline allocations larger than this in doublewords must go slow")\
1391                                                                             \
1392   product(bool, AggressiveOpts, false,                                      \
1393           "(Deprecated) Enable aggressive optimizations - see arguments.cpp") \
1394                                                                             \
1395   product_pd(bool, CompactStrings,                                          \
1396           "Enable Strings to use single byte chars in backing store")       \
1397                                                                             \
1398   product_pd(uintx, TypeProfileLevel,                                       \
1399           "=XYZ, with Z: Type profiling of arguments at call; "             \
1400                      "Y: Type profiling of return value at call; "          \
1401                      "X: Type profiling of parameters to methods; "         \
1402           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
1403           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
1404                                                                             \
1405   product(intx, TypeProfileArgsLimit,     2,                                \
1406           "max number of call arguments to consider for type profiling")    \
1407           range(0, 16)                                                      \
1408                                                                             \
1409   product(intx, TypeProfileParmsLimit,    2,                                \
1410           "max number of incoming parameters to consider for type profiling"\
1411           ", -1 for all")                                                   \
1412           range(-1, 64)                                                     \
1413                                                                             \
1414   /* statistics */                                                          \
1415   develop(bool, CountCompiledCalls, false,                                  \
1416           "Count method invocations")                                       \
1417                                                                             \
1418   notproduct(bool, CountRuntimeCalls, false,                                \
1419           "Count VM runtime calls")                                         \
1420                                                                             \
1421   develop(bool, CountJNICalls, false,                                       \
1422           "Count jni method invocations")                                   \
1423                                                                             \
1424   notproduct(bool, CountJVMCalls, false,                                    \
1425           "Count jvm method invocations")                                   \
1426                                                                             \
1427   notproduct(bool, CountRemovableExceptions, false,                         \
1428           "Count exceptions that could be replaced by branches due to "     \
1429           "inlining")                                                       \
1430                                                                             \
1431   notproduct(bool, ICMissHistogram, false,                                  \
1432           "Produce histogram of IC misses")                                 \
1433                                                                             \
1434   /* interpreter */                                                         \
1435   product_pd(bool, RewriteBytecodes,                                        \
1436           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
1437                                                                             \
1438   product_pd(bool, RewriteFrequentPairs,                                    \
1439           "Rewrite frequently used bytecode pairs into a single bytecode")  \
1440                                                                             \
1441   diagnostic(bool, PrintInterpreter, false,                                 \
1442           "Print the generated interpreter code")                           \
1443                                                                             \
1444   product(bool, UseInterpreter, true,                                       \
1445           "Use interpreter for non-compiled methods")                       \
1446                                                                             \
1447   develop(bool, UseFastSignatureHandlers, true,                             \
1448           "Use fast signature handlers for native calls")                   \
1449                                                                             \
1450   product(bool, UseLoopCounter, true,                                       \
1451           "Increment invocation counter on backward branch")                \
1452                                                                             \
1453   product_pd(bool, UseOnStackReplacement,                                   \
1454           "Use on stack replacement, calls runtime if invoc. counter "      \
1455           "overflows in loop")                                              \
1456                                                                             \
1457   notproduct(bool, TraceOnStackReplacement, false,                          \
1458           "Trace on stack replacement")                                     \
1459                                                                             \
1460   product_pd(bool, PreferInterpreterNativeStubs,                            \
1461           "Use always interpreter stubs for native methods invoked via "    \
1462           "interpreter")                                                    \
1463                                                                             \
1464   develop(bool, CountBytecodes, false,                                      \
1465           "Count number of bytecodes executed")                             \
1466                                                                             \
1467   develop(bool, PrintBytecodeHistogram, false,                              \
1468           "Print histogram of the executed bytecodes")                      \
1469                                                                             \
1470   develop(bool, PrintBytecodePairHistogram, false,                          \
1471           "Print histogram of the executed bytecode pairs")                 \
1472                                                                             \
1473   diagnostic(bool, PrintSignatureHandlers, false,                           \
1474           "Print code generated for native method signature handlers")      \
1475                                                                             \
1476   develop(bool, VerifyOops, false,                                          \
1477           "Do plausibility checks for oops")                                \
1478                                                                             \
1479   develop(bool, CheckUnhandledOops, false,                                  \
1480           "Check for unhandled oops in VM code")                            \
1481                                                                             \
1482   develop(bool, VerifyJNIFields, trueInDebug,                               \
1483           "Verify jfieldIDs for instance fields")                           \
1484                                                                             \
1485   notproduct(bool, VerifyJNIEnvThread, false,                               \
1486           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
1487           "from JNI")                                                       \
1488                                                                             \
1489   develop(bool, VerifyFPU, false,                                           \
1490           "Verify FPU state (check for NaN's, etc.)")                       \
1491                                                                             \
1492   develop(bool, VerifyThread, false,                                        \
1493           "Watch the thread register for corruption (SPARC only)")          \
1494                                                                             \
1495   develop(bool, VerifyActivationFrameSize, false,                           \
1496           "Verify that activation frame didn't become smaller than its "    \
1497           "minimal size")                                                   \
1498                                                                             \
1499   develop(bool, TraceFrequencyInlining, false,                              \
1500           "Trace frequency based inlining")                                 \
1501                                                                             \
1502   develop_pd(bool, InlineIntrinsics,                                        \
1503           "Inline intrinsics that can be statically resolved")              \
1504                                                                             \
1505   product_pd(bool, ProfileInterpreter,                                      \
1506           "Profile at the bytecode level during interpretation")            \
1507                                                                             \
1508   develop(bool, TraceProfileInterpreter, false,                             \
1509           "Trace profiling at the bytecode level during interpretation. "   \
1510           "This outputs the profiling information collected to improve "    \
1511           "jit compilation.")                                               \
1512                                                                             \
1513   develop_pd(bool, ProfileTraps,                                            \
1514           "Profile deoptimization traps at the bytecode level")             \
1515                                                                             \
1516   product(intx, ProfileMaturityPercentage, 20,                              \
1517           "number of method invocations/branches (expressed as % of "       \
1518           "CompileThreshold) before using the method's profile")            \
1519           range(0, 100)                                                     \
1520                                                                             \
1521   diagnostic(bool, PrintMethodData, false,                                  \
1522           "Print the results of +ProfileInterpreter at end of run")         \
1523                                                                             \
1524   develop(bool, VerifyDataPointer, trueInDebug,                             \
1525           "Verify the method data pointer during interpreter profiling")    \
1526                                                                             \
1527   develop(bool, VerifyCompiledCode, false,                                  \
1528           "Include miscellaneous runtime verifications in nmethod code; "   \
1529           "default off because it disturbs nmethod size heuristics")        \
1530                                                                             \
1531   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
1532           "Manually make GC thread crash then dump java stack trace;  "     \
1533           "Test only")                                                      \
1534                                                                             \
1535   /* compilation */                                                         \
1536   product(bool, UseCompiler, true,                                          \
1537           "Use Just-In-Time compilation")                                   \
1538                                                                             \
1539   develop(bool, TraceCompilationPolicy, false,                              \
1540           "Trace compilation policy")                                       \
1541                                                                             \
1542   develop(bool, TimeCompilationPolicy, false,                               \
1543           "Time the compilation policy")                                    \
1544                                                                             \
1545   product(bool, UseCounterDecay, true,                                      \
1546           "Adjust recompilation counters")                                  \
1547                                                                             \
1548   develop(intx, CounterHalfLifeTime,    30,                                 \
1549           "Half-life time of invocation counters (in seconds)")             \
1550                                                                             \
1551   develop(intx, CounterDecayMinIntervalLength,   500,                       \
1552           "The minimum interval (in milliseconds) between invocation of "   \
1553           "CounterDecay")                                                   \
1554                                                                             \
1555   product(bool, AlwaysCompileLoopMethods, false,                            \
1556           "When using recompilation, never interpret methods "              \
1557           "containing loops")                                               \
1558                                                                             \
1559   product(bool, DontCompileHugeMethods, true,                               \
1560           "Do not compile methods > HugeMethodLimit")                       \
1561                                                                             \
1562   /* Bytecode escape analysis estimation. */                                \
1563   product(bool, EstimateArgEscape, true,                                    \
1564           "Analyze bytecodes to estimate escape state of arguments")        \
1565                                                                             \
1566   product(intx, BCEATraceLevel, 0,                                          \
1567           "How much tracing to do of bytecode escape analysis estimates "   \
1568           "(0-3)")                                                          \
1569           range(0, 3)                                                       \
1570                                                                             \
1571   product(intx, MaxBCEAEstimateLevel, 5,                                    \
1572           "Maximum number of nested calls that are analyzed by BC EA")      \
1573           range(0, max_jint)                                                \
1574                                                                             \
1575   product(intx, MaxBCEAEstimateSize, 150,                                   \
1576           "Maximum bytecode size of a method to be analyzed by BC EA")      \
1577           range(0, max_jint)                                                \
1578                                                                             \
1579   product(intx,  AllocatePrefetchStyle, 1,                                  \
1580           "0 = no prefetch, "                                               \
1581           "1 = generate prefetch instructions for each allocation, "        \
1582           "2 = use TLAB watermark to gate allocation prefetch, "            \
1583           "3 = generate one prefetch instruction per cache line")           \
1584           range(0, 3)                                                       \
1585                                                                             \
1586   product(intx,  AllocatePrefetchDistance, -1,                              \
1587           "Distance to prefetch ahead of allocation pointer. "              \
1588           "-1: use system-specific value (automatically determined")        \
1589           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
1590                                                                             \
1591   product(intx,  AllocatePrefetchLines, 3,                                  \
1592           "Number of lines to prefetch ahead of array allocation pointer")  \
1593           range(1, 64)                                                      \
1594                                                                             \
1595   product(intx,  AllocateInstancePrefetchLines, 1,                          \
1596           "Number of lines to prefetch ahead of instance allocation "       \
1597           "pointer")                                                        \
1598           range(1, 64)                                                      \
1599                                                                             \
1600   product(intx,  AllocatePrefetchStepSize, 16,                              \
1601           "Step size in bytes of sequential prefetch instructions")         \
1602           range(1, 512)                                                     \
1603           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
1604                                                                             \
1605   product(intx,  AllocatePrefetchInstr, 0,                                  \
1606           "Select instruction to prefetch ahead of allocation pointer")     \
1607           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
1608                                                                             \
1609   /* deoptimization */                                                      \
1610   develop(bool, TraceDeoptimization, false,                                 \
1611           "Trace deoptimization")                                           \
1612                                                                             \
1613   develop(bool, PrintDeoptimizationDetails, false,                          \
1614           "Print more information about deoptimization")                    \
1615                                                                             \
1616   develop(bool, DebugDeoptimization, false,                                 \
1617           "Tracing various information while debugging deoptimization")     \
1618                                                                             \
1619   product(intx, SelfDestructTimer, 0,                                       \
1620           "Will cause VM to terminate after a given time (in minutes) "     \
1621           "(0 means off)")                                                  \
1622           range(0, max_intx)                                                \
1623                                                                             \
1624   product(intx, MaxJavaStackTraceDepth, 1024,                               \
1625           "The maximum number of lines in the stack trace for Java "        \
1626           "exceptions (0 means all)")                                       \
1627           range(0, max_jint/2)                                              \
1628                                                                             \
1629   /* notice: the max range value here is max_jint, not max_intx  */         \
1630   /* because of overflow issue                                   */         \
1631   diagnostic(intx, GuaranteedSafepointInterval, 1000,                       \
1632           "Guarantee a safepoint (at least) every so many milliseconds "    \
1633           "(0 means none)")                                                 \
1634           range(0, max_jint)                                                \
1635                                                                             \
1636   product(intx, SafepointTimeoutDelay, 10000,                               \
1637           "Delay in milliseconds for option SafepointTimeout")              \
1638   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
1639   NOT_LP64(range(0, max_intx))                                              \
1640                                                                             \
1641   product(intx, NmethodSweepActivity, 10,                                   \
1642           "Removes cold nmethods from code cache if > 0. Higher values "    \
1643           "result in more aggressive sweeping")                             \
1644           range(0, 2000)                                                    \
1645                                                                             \
1646   notproduct(bool, LogSweeper, false,                                       \
1647           "Keep a ring buffer of sweeper activity")                         \
1648                                                                             \
1649   notproduct(intx, SweeperLogEntries, 1024,                                 \
1650           "Number of records in the ring buffer of sweeper activity")       \
1651                                                                             \
1652   notproduct(intx, MemProfilingInterval, 500,                               \
1653           "Time between each invocation of the MemProfiler")                \
1654                                                                             \
1655   develop(intx, MallocCatchPtr, -1,                                         \
1656           "Hit breakpoint when mallocing/freeing this pointer")             \
1657                                                                             \
1658   notproduct(ccstrlist, SuppressErrorAt, "",                                \
1659           "List of assertions (file:line) to muzzle")                       \
1660                                                                             \
1661   develop(intx, StackPrintLimit, 100,                                       \
1662           "number of stack frames to print in VM-level stack dump")         \
1663                                                                             \
1664   notproduct(intx, MaxElementPrintSize, 256,                                \
1665           "maximum number of elements to print")                            \
1666                                                                             \
1667   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
1668           "maximum number of subklasses to print when printing klass")      \
1669                                                                             \
1670   product(intx, MaxInlineLevel, 9,                                          \
1671           "maximum number of nested calls that are inlined")                \
1672           range(0, max_jint)                                                \
1673                                                                             \
1674   product(intx, MaxRecursiveInlineLevel, 1,                                 \
1675           "maximum number of nested recursive calls that are inlined")      \
1676           range(0, max_jint)                                                \
1677                                                                             \
1678   develop(intx, MaxForceInlineLevel, 100,                                   \
1679           "maximum number of nested calls that are forced for inlining "    \
1680           "(using CompileCommand or marked w/ @ForceInline)")               \
1681           range(0, max_jint)                                                \
1682                                                                             \
1683   product_pd(intx, InlineSmallCode,                                         \
1684           "Only inline already compiled methods if their code size is "     \
1685           "less than this")                                                 \
1686           range(0, max_jint)                                                \
1687                                                                             \
1688   product(intx, MaxInlineSize, 35,                                          \
1689           "The maximum bytecode size of a method to be inlined")            \
1690           range(0, max_jint)                                                \
1691                                                                             \
1692   product_pd(intx, FreqInlineSize,                                          \
1693           "The maximum bytecode size of a frequent method to be inlined")   \
1694           range(0, max_jint)                                                \
1695                                                                             \
1696   product(intx, MaxTrivialSize, 6,                                          \
1697           "The maximum bytecode size of a trivial method to be inlined")    \
1698           range(0, max_jint)                                                \
1699                                                                             \
1700   product(intx, MinInliningThreshold, 250,                                  \
1701           "The minimum invocation count a method needs to have to be "      \
1702           "inlined")                                                        \
1703           range(0, max_jint)                                                \
1704                                                                             \
1705   develop(intx, MethodHistogramCutoff, 100,                                 \
1706           "The cutoff value for method invocation histogram (+CountCalls)") \
1707                                                                             \
1708   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
1709           "Number of interpreted methods to show in profile")               \
1710                                                                             \
1711   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
1712           "Number of compiled methods to show in profile")                  \
1713                                                                             \
1714   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
1715           "Number of stub methods to show in profile")                      \
1716                                                                             \
1717   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
1718           "Number of runtime stub nodes to show in profile")                \
1719                                                                             \
1720   product(intx, ProfileIntervalsTicks, 100,                                 \
1721           "Number of ticks between printing of interval profile "           \
1722           "(+ProfileIntervals)")                                            \
1723           range(0, max_intx)                                                \
1724                                                                             \
1725   develop(intx, DontYieldALotInterval,    10,                               \
1726           "Interval between which yields will be dropped (milliseconds)")   \
1727                                                                             \
1728   develop(intx, ProfilerPCTickThreshold,    15,                             \
1729           "Number of ticks in a PC buckets to be a hotspot")                \
1730                                                                             \
1731   notproduct(intx, DeoptimizeALotInterval,     5,                           \
1732           "Number of exits until DeoptimizeALot kicks in")                  \
1733                                                                             \
1734   notproduct(intx, ZombieALotInterval,     5,                               \
1735           "Number of exits until ZombieALot kicks in")                      \
1736                                                                             \
1737   diagnostic(uintx, MallocMaxTestWords,     0,                              \
1738           "If non-zero, maximum number of words that malloc/realloc can "   \
1739           "allocate (for testing only)")                                    \
1740           range(0, max_uintx)                                               \
1741                                                                             \
1742   product(intx, TypeProfileWidth, 2,                                        \
1743           "Number of receiver types to record in call/cast profile")        \
1744           range(0, 8)                                                       \
1745                                                                             \
1746   develop(intx, BciProfileWidth,      2,                                    \
1747           "Number of return bci's to record in ret profile")                \
1748                                                                             \
1749   product(intx, PerMethodRecompilationCutoff, 400,                          \
1750           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
1751           range(-1, max_intx)                                               \
1752                                                                             \
1753   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
1754           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
1755           range(-1, max_intx)                                               \
1756                                                                             \
1757   product(intx, PerMethodTrapLimit,  100,                                   \
1758           "Limit on traps (of one kind) in a method (includes inlines)")    \
1759           range(0, max_jint)                                                \
1760                                                                             \
1761   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
1762           "Limit on speculative traps (of one kind) in a method "           \
1763           "(includes inlines)")                                             \
1764           range(0, max_jint)                                                \
1765                                                                             \
1766   product(intx, PerBytecodeTrapLimit,  4,                                   \
1767           "Limit on traps (of one kind) at a particular BCI")               \
1768           range(0, max_jint)                                                \
1769                                                                             \
1770   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
1771           "Extra method data trap entries for speculation")                 \
1772                                                                             \
1773   develop(intx, InlineFrequencyRatio,    20,                                \
1774           "Ratio of call site execution to caller method invocation")       \
1775           range(0, max_jint)                                                \
1776                                                                             \
1777   diagnostic_pd(intx, InlineFrequencyCount,                                 \
1778           "Count of call site execution necessary to trigger frequent "     \
1779           "inlining")                                                       \
1780           range(0, max_jint)                                                \
1781                                                                             \
1782   develop(intx, InlineThrowCount,    50,                                    \
1783           "Force inlining of interpreted methods that throw this often")    \
1784           range(0, max_jint)                                                \
1785                                                                             \
1786   develop(intx, InlineThrowMaxSize,   200,                                  \
1787           "Force inlining of throwing methods smaller than this")           \
1788           range(0, max_jint)                                                \
1789                                                                             \
1790   develop(intx, ProfilerNodeSize,  1024,                                    \
1791           "Size in K to allocate for the Profile Nodes of each thread")     \
1792           range(0, 1024)                                                    \
1793                                                                             \
1794   product_pd(size_t, MetaspaceSize,                                         \
1795           "Initial threshold (in bytes) at which a garbage collection "     \
1796           "is done to reduce Metaspace usage")                              \
1797           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
1798                                                                             \
1799   product(size_t, MaxMetaspaceSize, max_uintx,                              \
1800           "Maximum size of Metaspaces (in bytes)")                          \
1801           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
1802                                                                             \
1803   product(size_t, CompressedClassSpaceSize, 1*G,                            \
1804           "Maximum size of class area in Metaspace when compressed "        \
1805           "class pointers are used")                                        \
1806           range(1*M, 3*G)                                                   \
1807                                                                             \
1808   manageable(uintx, MinHeapFreeRatio, 40,                                   \
1809           "The minimum percentage of heap free after GC to avoid expansion."\
1810           " For most GCs this applies to the old generation. In G1 and"     \
1811           " ParallelGC it applies to the whole heap.")                      \
1812           range(0, 100)                                                     \
1813           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
1814                                                                             \
1815   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
1816           "The maximum percentage of heap free after GC to avoid shrinking."\
1817           " For most GCs this applies to the old generation. In G1 and"     \
1818           " ParallelGC it applies to the whole heap.")                      \
1819           range(0, 100)                                                     \
1820           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
1821                                                                             \
1822   product(bool, ShrinkHeapInSteps, true,                                    \
1823           "When disabled, informs the GC to shrink the java heap directly"  \
1824           " to the target size at the next full GC rather than requiring"   \
1825           " smaller steps during multiple full GCs.")                       \
1826                                                                             \
1827   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
1828           "Number of milliseconds per MB of free space in the heap")        \
1829           range(0, max_intx)                                                \
1830           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
1831                                                                             \
1832   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
1833           "The minimum change in heap space due to GC (in bytes)")          \
1834           range(0, max_uintx)                                               \
1835                                                                             \
1836   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
1837           "The minimum expansion of Metaspace (in bytes)")                  \
1838           range(0, max_uintx)                                               \
1839                                                                             \
1840   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
1841           "The maximum percentage of Metaspace free after GC to avoid "     \
1842           "shrinking")                                                      \
1843           range(0, 100)                                                     \
1844           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1845                                                                             \
1846   product(uintx, MinMetaspaceFreeRatio,    40,                              \
1847           "The minimum percentage of Metaspace free after GC to avoid "     \
1848           "expansion")                                                      \
1849           range(0, 99)                                                      \
1850           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
1851                                                                             \
1852   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
1853           "The maximum expansion of Metaspace without full GC (in bytes)")  \
1854           range(0, max_uintx)                                               \
1855                                                                             \
1856   /* stack parameters */                                                    \
1857   product_pd(intx, StackYellowPages,                                        \
1858           "Number of yellow zone (recoverable overflows) pages of size "    \
1859           "4KB. If pages are bigger yellow zone is aligned up.")            \
1860           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
1861                                                                             \
1862   product_pd(intx, StackRedPages,                                           \
1863           "Number of red zone (unrecoverable overflows) pages of size "     \
1864           "4KB. If pages are bigger red zone is aligned up.")               \
1865           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
1866                                                                             \
1867   product_pd(intx, StackReservedPages,                                      \
1868           "Number of reserved zone (reserved to annotated methods) pages"   \
1869           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
1870           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
1871                                                                             \
1872   product(bool, RestrictReservedStack, true,                                \
1873           "Restrict @ReservedStackAccess to trusted classes")               \
1874                                                                             \
1875   /* greater stack shadow pages can't generate instruction to bang stack */ \
1876   product_pd(intx, StackShadowPages,                                        \
1877           "Number of shadow zone (for overflow checking) pages of size "    \
1878           "4KB. If pages are bigger shadow zone is aligned up. "            \
1879           "This should exceed the depth of the VM and native call stack.")  \
1880           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
1881                                                                             \
1882   product_pd(intx, ThreadStackSize,                                         \
1883           "Thread Stack Size (in Kbytes)")                                  \
1884           range(0, 1 * M)                                                   \
1885                                                                             \
1886   product_pd(intx, VMThreadStackSize,                                       \
1887           "Non-Java Thread Stack Size (in Kbytes)")                         \
1888           range(0, max_intx/(1 * K))                                        \
1889                                                                             \
1890   product_pd(intx, CompilerThreadStackSize,                                 \
1891           "Compiler Thread Stack Size (in Kbytes)")                         \
1892           range(0, max_intx/(1 * K))                                        \
1893                                                                             \
1894   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
1895           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
1896                                                                             \
1897   /* code cache parameters                                    */            \
1898   develop_pd(uintx, CodeCacheSegmentSize,                                   \
1899           "Code cache segment size (in bytes) - smallest unit of "          \
1900           "allocation")                                                     \
1901           range(1, 1024)                                                    \
1902           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
1903                                                                             \
1904   develop_pd(intx, CodeEntryAlignment,                                      \
1905           "Code entry alignment for generated code (in bytes)")             \
1906           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
1907                                                                             \
1908   product_pd(intx, OptoLoopAlignment,                                       \
1909           "Align inner loops to zero relative to this modulus")             \
1910           range(1, 16)                                                      \
1911           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
1912                                                                             \
1913   product_pd(uintx, InitialCodeCacheSize,                                   \
1914           "Initial code cache size (in bytes)")                             \
1915           range(os::vm_page_size(), max_uintx)                              \
1916                                                                             \
1917   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
1918           "Minimum code cache size (in bytes) required to start VM.")       \
1919           range(0, max_uintx)                                               \
1920                                                                             \
1921   product(bool, SegmentedCodeCache, false,                                  \
1922           "Use a segmented code cache")                                     \
1923                                                                             \
1924   product_pd(uintx, ReservedCodeCacheSize,                                  \
1925           "Reserved code cache size (in bytes) - maximum code cache size")  \
1926           range(os::vm_page_size(), max_uintx)                              \
1927                                                                             \
1928   product_pd(uintx, NonProfiledCodeHeapSize,                                \
1929           "Size of code heap with non-profiled methods (in bytes)")         \
1930           range(0, max_uintx)                                               \
1931                                                                             \
1932   product_pd(uintx, ProfiledCodeHeapSize,                                   \
1933           "Size of code heap with profiled methods (in bytes)")             \
1934           range(0, max_uintx)                                               \
1935                                                                             \
1936   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
1937           "Size of code heap with non-nmethods (in bytes)")                 \
1938           range(os::vm_page_size(), max_uintx)                              \
1939                                                                             \
1940   product_pd(uintx, CodeCacheExpansionSize,                                 \
1941           "Code cache expansion size (in bytes)")                           \
1942           range(32*K, max_uintx)                                            \
1943                                                                             \
1944   diagnostic_pd(uintx, CodeCacheMinBlockLength,                             \
1945           "Minimum number of segments in a code cache block")               \
1946           range(1, 100)                                                     \
1947                                                                             \
1948   notproduct(bool, ExitOnFullCodeCache, false,                              \
1949           "Exit the VM if we fill the code cache")                          \
1950                                                                             \
1951   product(bool, UseCodeCacheFlushing, true,                                 \
1952           "Remove cold/old nmethods from the code cache")                   \
1953                                                                             \
1954   product(uintx, StartAggressiveSweepingAt, 10,                             \
1955           "Start aggressive sweeping if X[%] of the code cache is free."    \
1956           "Segmented code cache: X[%] of the non-profiled heap."            \
1957           "Non-segmented code cache: X[%] of the total code cache")         \
1958           range(0, 100)                                                     \
1959                                                                             \
1960   /* AOT parameters */                                                      \
1961   product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false),                      \
1962           "Use AOT compiled files")                                         \
1963                                                                             \
1964   product(ccstrlist, AOTLibrary, NULL,                                      \
1965           "AOT library")                                                    \
1966                                                                             \
1967   product(bool, PrintAOT, false,                                            \
1968           "Print used AOT klasses and methods")                             \
1969                                                                             \
1970   notproduct(bool, PrintAOTStatistics, false,                               \
1971           "Print AOT statistics")                                           \
1972                                                                             \
1973   diagnostic(bool, UseAOTStrictLoading, false,                              \
1974           "Exit the VM if any of the AOT libraries has invalid config")     \
1975                                                                             \
1976   product(bool, CalculateClassFingerprint, false,                           \
1977           "Calculate class fingerprint")                                    \
1978                                                                             \
1979   /* interpreter debugging */                                               \
1980   develop(intx, BinarySwitchThreshold, 5,                                   \
1981           "Minimal number of lookupswitch entries for rewriting to binary " \
1982           "switch")                                                         \
1983                                                                             \
1984   develop(intx, StopInterpreterAt, 0,                                       \
1985           "Stop interpreter execution at specified bytecode number")        \
1986                                                                             \
1987   develop(intx, TraceBytecodesAt, 0,                                        \
1988           "Trace bytecodes starting with specified bytecode number")        \
1989                                                                             \
1990   /* compiler interface */                                                  \
1991   develop(intx, CIStart, 0,                                                 \
1992           "The id of the first compilation to permit")                      \
1993                                                                             \
1994   develop(intx, CIStop, max_jint,                                           \
1995           "The id of the last compilation to permit")                       \
1996                                                                             \
1997   develop(intx, CIStartOSR, 0,                                              \
1998           "The id of the first osr compilation to permit "                  \
1999           "(CICountOSR must be on)")                                        \
2000                                                                             \
2001   develop(intx, CIStopOSR, max_jint,                                        \
2002           "The id of the last osr compilation to permit "                   \
2003           "(CICountOSR must be on)")                                        \
2004                                                                             \
2005   develop(intx, CIBreakAtOSR, -1,                                           \
2006           "The id of osr compilation to break at")                          \
2007                                                                             \
2008   develop(intx, CIBreakAt, -1,                                              \
2009           "The id of compilation to break at")                              \
2010                                                                             \
2011   product(ccstrlist, CompileOnly, "",                                       \
2012           "List of methods (pkg/class.name) to restrict compilation to")    \
2013                                                                             \
2014   product(ccstr, CompileCommandFile, NULL,                                  \
2015           "Read compiler commands from this file [.hotspot_compiler]")      \
2016                                                                             \
2017   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
2018           "Read compiler directives from this file")                        \
2019                                                                             \
2020   product(ccstrlist, CompileCommand, "",                                    \
2021           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
2022                                                                             \
2023   develop(bool, ReplayCompiles, false,                                      \
2024           "Enable replay of compilations from ReplayDataFile")              \
2025                                                                             \
2026   product(ccstr, ReplayDataFile, NULL,                                      \
2027           "File containing compilation replay information"                  \
2028           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
2029                                                                             \
2030    product(ccstr, InlineDataFile, NULL,                                     \
2031           "File containing inlining replay information"                     \
2032           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
2033                                                                             \
2034   develop(intx, ReplaySuppressInitializers, 2,                              \
2035           "Control handling of class initialization during replay: "        \
2036           "0 - don't do anything special; "                                 \
2037           "1 - treat all class initializers as empty; "                     \
2038           "2 - treat class initializers for application classes as empty; " \
2039           "3 - allow all class initializers to run during bootstrap but "   \
2040           "    pretend they are empty after starting replay")               \
2041           range(0, 3)                                                       \
2042                                                                             \
2043   develop(bool, ReplayIgnoreInitErrors, false,                              \
2044           "Ignore exceptions thrown during initialization for replay")      \
2045                                                                             \
2046   product(bool, DumpReplayDataOnError, true,                                \
2047           "Record replay data for crashing compiler threads")               \
2048                                                                             \
2049   product(bool, CICompilerCountPerCPU, false,                               \
2050           "1 compiler thread for log(N CPUs)")                              \
2051                                                                             \
2052   develop(intx, CIFireOOMAt,    -1,                                         \
2053           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
2054           "(non-negative value throws OOM after this many CI accesses "     \
2055           "in each compile)")                                               \
2056   notproduct(intx, CICrashAt, -1,                                           \
2057           "id of compilation to trigger assert in compiler thread for "     \
2058           "the purpose of testing, e.g. generation of replay data")         \
2059   notproduct(bool, CIObjectFactoryVerify, false,                            \
2060           "enable potentially expensive verification in ciObjectFactory")   \
2061                                                                             \
2062   /* Priorities */                                                          \
2063   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
2064                                                                             \
2065   product(intx, ThreadPriorityPolicy, 0,                                    \
2066           "0 : Normal.                                                     "\
2067           "    VM chooses priorities that are appropriate for normal       "\
2068           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
2069           "    to normal native priority. Java priorities below "           \
2070           "    NORM_PRIORITY map to lower native priority values. On       "\
2071           "    Windows applications are allowed to use higher native       "\
2072           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
2073           "    not use the highest possible native priority,               "\
2074           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
2075           "    system threads. On Linux thread priorities are ignored      "\
2076           "    because the OS does not support static priority in          "\
2077           "    SCHED_OTHER scheduling class which is the only choice for   "\
2078           "    non-root, non-realtime applications.                        "\
2079           "1 : Aggressive.                                                 "\
2080           "    Java thread priorities map over to the entire range of      "\
2081           "    native thread priorities. Higher Java thread priorities map "\
2082           "    to higher native thread priorities. This policy should be   "\
2083           "    used with care, as sometimes it can cause performance       "\
2084           "    degradation in the application and/or the entire system. On "\
2085           "    Linux this policy requires root privilege.")                 \
2086           range(0, 1)                                                       \
2087                                                                             \
2088   product(bool, ThreadPriorityVerbose, false,                               \
2089           "Print priority changes")                                         \
2090                                                                             \
2091   product(intx, CompilerThreadPriority, -1,                                 \
2092           "The native priority at which compiler threads should run "       \
2093           "(-1 means no change)")                                           \
2094           range(min_jint, max_jint)                                         \
2095           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
2096                                                                             \
2097   product(intx, VMThreadPriority, -1,                                       \
2098           "The native priority at which the VM thread should run "          \
2099           "(-1 means no change)")                                           \
2100           range(-1, 127)                                                    \
2101                                                                             \
2102   product(intx, JavaPriority1_To_OSPriority, -1,                            \
2103           "Map Java priorities to OS priorities")                           \
2104           range(-1, 127)                                                    \
2105                                                                             \
2106   product(intx, JavaPriority2_To_OSPriority, -1,                            \
2107           "Map Java priorities to OS priorities")                           \
2108           range(-1, 127)                                                    \
2109                                                                             \
2110   product(intx, JavaPriority3_To_OSPriority, -1,                            \
2111           "Map Java priorities to OS priorities")                           \
2112           range(-1, 127)                                                    \
2113                                                                             \
2114   product(intx, JavaPriority4_To_OSPriority, -1,                            \
2115           "Map Java priorities to OS priorities")                           \
2116           range(-1, 127)                                                    \
2117                                                                             \
2118   product(intx, JavaPriority5_To_OSPriority, -1,                            \
2119           "Map Java priorities to OS priorities")                           \
2120           range(-1, 127)                                                    \
2121                                                                             \
2122   product(intx, JavaPriority6_To_OSPriority, -1,                            \
2123           "Map Java priorities to OS priorities")                           \
2124           range(-1, 127)                                                    \
2125                                                                             \
2126   product(intx, JavaPriority7_To_OSPriority, -1,                            \
2127           "Map Java priorities to OS priorities")                           \
2128           range(-1, 127)                                                    \
2129                                                                             \
2130   product(intx, JavaPriority8_To_OSPriority, -1,                            \
2131           "Map Java priorities to OS priorities")                           \
2132           range(-1, 127)                                                    \
2133                                                                             \
2134   product(intx, JavaPriority9_To_OSPriority, -1,                            \
2135           "Map Java priorities to OS priorities")                           \
2136           range(-1, 127)                                                    \
2137                                                                             \
2138   product(intx, JavaPriority10_To_OSPriority,-1,                            \
2139           "Map Java priorities to OS priorities")                           \
2140           range(-1, 127)                                                    \
2141                                                                             \
2142   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
2143           "Java thread priority 10 maps to critical scheduling priority")   \
2144                                                                             \
2145   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
2146           "Compiler thread(s) run at critical scheduling priority")         \
2147                                                                             \
2148   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
2149           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
2150                                                                             \
2151   /* compiler debugging */                                                  \
2152   notproduct(intx, CompileTheWorldStartAt,     1,                           \
2153           "First class to consider when using +CompileTheWorld")            \
2154                                                                             \
2155   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
2156           "Last class to consider when using +CompileTheWorld")             \
2157                                                                             \
2158   develop(intx, NewCodeParameter,      0,                                   \
2159           "Testing Only: Create a dedicated integer parameter before "      \
2160           "putback")                                                        \
2161                                                                             \
2162   /* new oopmap storage allocation */                                       \
2163   develop(intx, MinOopMapAllocation,     8,                                 \
2164           "Minimum number of OopMap entries in an OopMapSet")               \
2165                                                                             \
2166   /* Background Compilation */                                              \
2167   develop(intx, LongCompileThreshold,     50,                               \
2168           "Used with +TraceLongCompiles")                                   \
2169                                                                             \
2170   /* recompilation */                                                       \
2171   product_pd(intx, CompileThreshold,                                        \
2172           "number of interpreted method invocations before (re-)compiling") \
2173           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
2174                                                                             \
2175   product(double, CompileThresholdScaling, 1.0,                             \
2176           "Factor to control when first compilation happens "               \
2177           "(both with and without tiered compilation): "                    \
2178           "values greater than 1.0 delay counter overflow, "                \
2179           "values between 0 and 1.0 rush counter overflow, "                \
2180           "value of 1.0 leaves compilation thresholds unchanged "           \
2181           "value of 0.0 is equivalent to -Xint. "                           \
2182           ""                                                                \
2183           "Flag can be set as per-method option. "                          \
2184           "If a value is specified for a method, compilation thresholds "   \
2185           "for that method are scaled by both the value of the global flag "\
2186           "and the value of the per-method flag.")                          \
2187           range(0.0, DBL_MAX)                                               \
2188                                                                             \
2189   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
2190           "Interpreter (tier 0) invocation notification frequency")         \
2191           range(0, 30)                                                      \
2192                                                                             \
2193   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
2194           "C1 without MDO (tier 2) invocation notification frequency")      \
2195           range(0, 30)                                                      \
2196                                                                             \
2197   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
2198           "C1 with MDO profiling (tier 3) invocation notification "         \
2199           "frequency")                                                      \
2200           range(0, 30)                                                      \
2201                                                                             \
2202   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
2203           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
2204           range(0, 30)                                                      \
2205                                                                             \
2206   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
2207           "Interpreter (tier 0) invocation notification frequency")         \
2208           range(0, 30)                                                      \
2209                                                                             \
2210   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
2211           "C1 without MDO (tier 2) invocation notification frequency")      \
2212           range(0, 30)                                                      \
2213                                                                             \
2214   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
2215           "C1 with MDO profiling (tier 3) invocation notification "         \
2216           "frequency")                                                      \
2217           range(0, 30)                                                      \
2218                                                                             \
2219   product(intx, Tier2CompileThreshold, 0,                                   \
2220           "threshold at which tier 2 compilation is invoked")               \
2221           range(0, max_jint)                                                \
2222                                                                             \
2223   product(intx, Tier2BackEdgeThreshold, 0,                                  \
2224           "Back edge threshold at which tier 2 compilation is invoked")     \
2225           range(0, max_jint)                                                \
2226                                                                             \
2227   product(intx, Tier3InvocationThreshold, 200,                              \
2228           "Compile if number of method invocations crosses this "           \
2229           "threshold")                                                      \
2230           range(0, max_jint)                                                \
2231                                                                             \
2232   product(intx, Tier3MinInvocationThreshold, 100,                           \
2233           "Minimum invocation to compile at tier 3")                        \
2234           range(0, max_jint)                                                \
2235                                                                             \
2236   product(intx, Tier3CompileThreshold, 2000,                                \
2237           "Threshold at which tier 3 compilation is invoked (invocation "   \
2238           "minimum must be satisfied)")                                     \
2239           range(0, max_jint)                                                \
2240                                                                             \
2241   product(intx, Tier3BackEdgeThreshold,  60000,                             \
2242           "Back edge threshold at which tier 3 OSR compilation is invoked") \
2243           range(0, max_jint)                                                \
2244                                                                             \
2245   product(intx, Tier3AOTInvocationThreshold, 10000,                         \
2246           "Compile if number of method invocations crosses this "           \
2247           "threshold if coming from AOT")                                   \
2248           range(0, max_jint)                                                \
2249                                                                             \
2250   product(intx, Tier3AOTMinInvocationThreshold, 1000,                       \
2251           "Minimum invocation to compile at tier 3 if coming from AOT")     \
2252           range(0, max_jint)                                                \
2253                                                                             \
2254   product(intx, Tier3AOTCompileThreshold, 15000,                            \
2255           "Threshold at which tier 3 compilation is invoked (invocation "   \
2256           "minimum must be satisfied) if coming from AOT")                  \
2257           range(0, max_jint)                                                \
2258                                                                             \
2259   product(intx, Tier3AOTBackEdgeThreshold,  120000,                         \
2260           "Back edge threshold at which tier 3 OSR compilation is invoked " \
2261           "if coming from AOT")                                             \
2262           range(0, max_jint)                                                \
2263                                                                             \
2264   product(intx, Tier4InvocationThreshold, 5000,                             \
2265           "Compile if number of method invocations crosses this "           \
2266           "threshold")                                                      \
2267           range(0, max_jint)                                                \
2268                                                                             \
2269   product(intx, Tier4MinInvocationThreshold, 600,                           \
2270           "Minimum invocation to compile at tier 4")                        \
2271           range(0, max_jint)                                                \
2272                                                                             \
2273   product(intx, Tier4CompileThreshold, 15000,                               \
2274           "Threshold at which tier 4 compilation is invoked (invocation "   \
2275           "minimum must be satisfied")                                      \
2276           range(0, max_jint)                                                \
2277                                                                             \
2278   product(intx, Tier4BackEdgeThreshold, 40000,                              \
2279           "Back edge threshold at which tier 4 OSR compilation is invoked") \
2280           range(0, max_jint)                                                \
2281                                                                             \
2282   product(intx, Tier3DelayOn, 5,                                            \
2283           "If C2 queue size grows over this amount per compiler thread "    \
2284           "stop compiling at tier 3 and start compiling at tier 2")         \
2285           range(0, max_jint)                                                \
2286                                                                             \
2287   product(intx, Tier3DelayOff, 2,                                           \
2288           "If C2 queue size is less than this amount per compiler thread "  \
2289           "allow methods compiled at tier 2 transition to tier 3")          \
2290           range(0, max_jint)                                                \
2291                                                                             \
2292   product(intx, Tier3LoadFeedback, 5,                                       \
2293           "Tier 3 thresholds will increase twofold when C1 queue size "     \
2294           "reaches this amount per compiler thread")                        \
2295           range(0, max_jint)                                                \
2296                                                                             \
2297   product(intx, Tier4LoadFeedback, 3,                                       \
2298           "Tier 4 thresholds will increase twofold when C2 queue size "     \
2299           "reaches this amount per compiler thread")                        \
2300           range(0, max_jint)                                                \
2301                                                                             \
2302   product(intx, TieredCompileTaskTimeout, 50,                               \
2303           "Kill compile task if method was not used within "                \
2304           "given timeout in milliseconds")                                  \
2305           range(0, max_intx)                                                \
2306                                                                             \
2307   product(intx, TieredStopAtLevel, 4,                                       \
2308           "Stop at given compilation level")                                \
2309           range(0, 4)                                                       \
2310                                                                             \
2311   product(intx, Tier0ProfilingStartPercentage, 200,                         \
2312           "Start profiling in interpreter if the counters exceed tier 3 "   \
2313           "thresholds by the specified percentage")                         \
2314           range(0, max_jint)                                                \
2315                                                                             \
2316   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
2317           "Increase the compile threshold for C1 compilation if the code "  \
2318           "cache is filled by the specified percentage")                    \
2319           range(0, 99)                                                      \
2320                                                                             \
2321   product(intx, TieredRateUpdateMinTime, 1,                                 \
2322           "Minimum rate sampling interval (in milliseconds)")               \
2323           range(0, max_intx)                                                \
2324                                                                             \
2325   product(intx, TieredRateUpdateMaxTime, 25,                                \
2326           "Maximum rate sampling interval (in milliseconds)")               \
2327           range(0, max_intx)                                                \
2328                                                                             \
2329   product_pd(bool, TieredCompilation,                                       \
2330           "Enable tiered compilation")                                      \
2331                                                                             \
2332   product(bool, PrintTieredEvents, false,                                   \
2333           "Print tiered events notifications")                              \
2334                                                                             \
2335   product_pd(intx, OnStackReplacePercentage,                                \
2336           "NON_TIERED number of method invocations/branches (expressed as " \
2337           "% of CompileThreshold) before (re-)compiling OSR code")          \
2338           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
2339                                                                             \
2340   product(intx, InterpreterProfilePercentage, 33,                           \
2341           "NON_TIERED number of method invocations/branches (expressed as " \
2342           "% of CompileThreshold) before profiling in the interpreter")     \
2343           range(0, 100)                                                     \
2344                                                                             \
2345   develop(intx, MaxRecompilationSearchLength,    10,                        \
2346           "The maximum number of frames to inspect when searching for "     \
2347           "recompilee")                                                     \
2348                                                                             \
2349   develop(intx, MaxInterpretedSearchLength,     3,                          \
2350           "The maximum number of interpreted frames to skip when searching "\
2351           "for recompilee")                                                 \
2352                                                                             \
2353   develop(intx, DesiredMethodLimit,  8000,                                  \
2354           "The desired maximum method size (in bytecodes) after inlining")  \
2355                                                                             \
2356   develop(intx, HugeMethodLimit,  8000,                                     \
2357           "Don't compile methods larger than this if "                      \
2358           "+DontCompileHugeMethods")                                        \
2359                                                                             \
2360   /* New JDK 1.4 reflection implementation */                               \
2361                                                                             \
2362   develop(intx, FastSuperclassLimit, 8,                                     \
2363           "Depth of hardwired instanceof accelerator array")                \
2364                                                                             \
2365   /* Properties for Java libraries  */                                      \
2366                                                                             \
2367   product(uint64_t, MaxDirectMemorySize, 0,                                 \
2368           "Maximum total size of NIO direct-buffer allocations")            \
2369           range(0, max_jlong)                                               \
2370                                                                             \
2371   /* Flags used for temporary code during development  */                   \
2372                                                                             \
2373   diagnostic(bool, UseNewCode, false,                                       \
2374           "Testing Only: Use the new version while testing")                \
2375                                                                             \
2376   diagnostic(bool, UseNewCode2, false,                                      \
2377           "Testing Only: Use the new version while testing")                \
2378                                                                             \
2379   diagnostic(bool, UseNewCode3, false,                                      \
2380           "Testing Only: Use the new version while testing")                \
2381                                                                             \
2382   /* flags for performance data collection */                               \
2383                                                                             \
2384   product(bool, UsePerfData, true,                                          \
2385           "Flag to disable jvmstat instrumentation for performance testing "\
2386           "and problem isolation purposes")                                 \
2387                                                                             \
2388   product(bool, PerfDataSaveToFile, false,                                  \
2389           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
2390                                                                             \
2391   product(ccstr, PerfDataSaveFile, NULL,                                    \
2392           "Save PerfData memory to the specified absolute pathname. "       \
2393           "The string %p in the file name (if present) "                    \
2394           "will be replaced by pid")                                        \
2395                                                                             \
2396   product(intx, PerfDataSamplingInterval, 50,                               \
2397           "Data sampling interval (in milliseconds)")                       \
2398           range(PeriodicTask::min_interval, max_jint)                       \
2399           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
2400                                                                             \
2401   product(bool, PerfDisableSharedMem, false,                                \
2402           "Store performance data in standard memory")                      \
2403                                                                             \
2404   product(intx, PerfDataMemorySize, 32*K,                                   \
2405           "Size of performance data memory region. Will be rounded "        \
2406           "up to a multiple of the native os page size.")                   \
2407           range(128, 32*64*K)                                               \
2408                                                                             \
2409   product(intx, PerfMaxStringConstLength, 1024,                             \
2410           "Maximum PerfStringConstant string length before truncation")     \
2411           range(32, 32*K)                                                   \
2412                                                                             \
2413   product(bool, PerfAllowAtExitRegistration, false,                         \
2414           "Allow registration of atexit() methods")                         \
2415                                                                             \
2416   product(bool, PerfBypassFileSystemCheck, false,                           \
2417           "Bypass Win32 file system criteria checks (Windows Only)")        \
2418                                                                             \
2419   product(intx, UnguardOnExecutionViolation, 0,                             \
2420           "Unguard page and retry on no-execute fault (Win32 only) "        \
2421           "0=off, 1=conservative, 2=aggressive")                            \
2422           range(0, 2)                                                       \
2423                                                                             \
2424   /* Serviceability Support */                                              \
2425                                                                             \
2426   product(bool, ManagementServer, false,                                    \
2427           "Create JMX Management Server")                                   \
2428                                                                             \
2429   product(bool, DisableAttachMechanism, false,                              \
2430           "Disable mechanism that allows tools to attach to this VM")       \
2431                                                                             \
2432   product(bool, StartAttachListener, false,                                 \
2433           "Always start Attach Listener at VM startup")                     \
2434                                                                             \
2435   product(bool, EnableDynamicAgentLoading, true,                            \
2436           "Allow tools to load agents with the attach mechanism")           \
2437                                                                             \
2438   manageable(bool, PrintConcurrentLocks, false,                             \
2439           "Print java.util.concurrent locks in thread dump")                \
2440                                                                             \
2441   /* Shared spaces */                                                       \
2442                                                                             \
2443   product(bool, UseSharedSpaces, true,                                      \
2444           "Use shared spaces for metadata")                                 \
2445                                                                             \
2446   product(bool, VerifySharedSpaces, false,                                  \
2447           "Verify shared spaces (false for default archive, true for "      \
2448           "archive specified by -XX:SharedArchiveFile)")                    \
2449                                                                             \
2450   product(bool, RequireSharedSpaces, false,                                 \
2451           "Require shared spaces for metadata")                             \
2452                                                                             \
2453   product(bool, DumpSharedSpaces, false,                                    \
2454           "Special mode: JVM reads a class list, loads classes, builds "    \
2455           "shared spaces, and dumps the shared spaces to a file to be "     \
2456           "used in future JVM runs")                                        \
2457                                                                             \
2458   product(bool, PrintSharedArchiveAndExit, false,                           \
2459           "Print shared archive file contents")                             \
2460                                                                             \
2461   product(bool, PrintSharedDictionary, false,                               \
2462           "If PrintSharedArchiveAndExit is true, also print the shared "    \
2463           "dictionary")                                                     \
2464                                                                             \
2465   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
2466           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
2467           "Address to allocate shared memory region for class data")        \
2468           range(0, SIZE_MAX)                                                \
2469                                                                             \
2470   product(ccstr, SharedArchiveConfigFile, NULL,                             \
2471           "Data to add to the CDS archive file")                            \
2472                                                                             \
2473   product(uintx, SharedSymbolTableBucketSize, 4,                            \
2474           "Average number of symbols per bucket in shared table")           \
2475           range(2, 246)                                                     \
2476                                                                             \
2477   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true,              \
2478           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
2479           "classes. Just exclude them from the shared dictionary.")         \
2480                                                                             \
2481   diagnostic(bool, PrintMethodHandleStubs, false,                           \
2482           "Print generated stub code for method handles")                   \
2483                                                                             \
2484   develop(bool, TraceMethodHandles, false,                                  \
2485           "trace internal method handle operations")                        \
2486                                                                             \
2487   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
2488           "perform extra checks when constructing method handles")          \
2489                                                                             \
2490   diagnostic(bool, ShowHiddenFrames, false,                                 \
2491           "show method handle implementation frames (usually hidden)")      \
2492                                                                             \
2493   experimental(bool, TrustFinalNonStaticFields, false,                      \
2494           "trust final non-static declarations for constant folding")       \
2495                                                                             \
2496   diagnostic(bool, FoldStableValues, true,                                  \
2497           "Optimize loads from stable fields (marked w/ @Stable)")          \
2498                                                                             \
2499   develop(bool, TraceInvokeDynamic, false,                                  \
2500           "trace internal invoke dynamic operations")                       \
2501                                                                             \
2502   diagnostic(int, UseBootstrapCallInfo, 1,                                  \
2503           "0: when resolving InDy or ConDy, force all BSM arguments to be " \
2504           "resolved before the bootstrap method is called; 1: when a BSM "  \
2505           "that may accept a BootstrapCallInfo is detected, use that API "  \
2506           "to pass BSM arguments, which allows the BSM to delay their "     \
2507           "resolution; 2+: stress test the BCI API by calling more BSMs "   \
2508           "via that API, instead of with the eagerly-resolved array.")      \
2509                                                                             \
2510   diagnostic(bool, PauseAtStartup,      false,                              \
2511           "Causes the VM to pause at startup time and wait for the pause "  \
2512           "file to be removed (default: ./vm.paused.<pid>)")                \
2513                                                                             \
2514   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
2515           "The file to create and for whose removal to await when pausing " \
2516           "at startup. (default: ./vm.paused.<pid>)")                       \
2517                                                                             \
2518   diagnostic(bool, PauseAtExit, false,                                      \
2519           "Pause and wait for keypress on exit if a debugger is attached")  \
2520                                                                             \
2521   product(bool, ExtendedDTraceProbes,    false,                             \
2522           "Enable performance-impacting dtrace probes")                     \
2523                                                                             \
2524   product(bool, DTraceMethodProbes, false,                                  \
2525           "Enable dtrace probes for method-entry and method-exit")          \
2526                                                                             \
2527   product(bool, DTraceAllocProbes, false,                                   \
2528           "Enable dtrace probes for object allocation")                     \
2529                                                                             \
2530   product(bool, DTraceMonitorProbes, false,                                 \
2531           "Enable dtrace probes for monitor events")                        \
2532                                                                             \
2533   product(bool, RelaxAccessControlCheck, false,                             \
2534           "Relax the access control checks in the verifier")                \
2535                                                                             \
2536   product(uintx, StringTableSize, defaultStringTableSize,                   \
2537           "Number of buckets in the interned String table "                 \
2538           "(will be rounded to nearest higher power of 2)")                 \
2539           range(minimumStringTableSize, 16777216ul)                         \
2540                                                                             \
2541   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
2542           "Number of buckets in the JVM internal Symbol table")             \
2543           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
2544                                                                             \
2545   product(bool, UseStringDeduplication, false,                              \
2546           "Use string deduplication")                                       \
2547                                                                             \
2548   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
2549           "A string must reach this age (or be promoted to an old region) " \
2550           "to be considered for deduplication")                             \
2551           range(1, markOopDesc::max_age)                                    \
2552                                                                             \
2553   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
2554           "Force table resize every time the table is scanned")             \
2555                                                                             \
2556   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
2557           "Force table rehash every time the table is scanned")             \
2558                                                                             \
2559   diagnostic(bool, WhiteBoxAPI, false,                                      \
2560           "Enable internal testing APIs")                                   \
2561                                                                             \
2562   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
2563            "Default survivor space alignment in bytes")                     \
2564            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
2565                                                                             \
2566   product(ccstr, DumpLoadedClassList, NULL,                                 \
2567           "Dump the names all loaded classes, that could be stored into "   \
2568           "the CDS archive, in the specified file")                         \
2569                                                                             \
2570   product(ccstr, SharedClassListFile, NULL,                                 \
2571           "Override the default CDS class list")                            \
2572                                                                             \
2573   product(ccstr, SharedArchiveFile, NULL,                                   \
2574           "Override the default location of the CDS archive file")          \
2575                                                                             \
2576   product(ccstr, ExtraSharedClassListFile, NULL,                            \
2577           "Extra classlist for building the CDS archive file")              \
2578                                                                             \
2579   experimental(size_t, ArrayAllocatorMallocLimit,                           \
2580           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
2581           "Allocation less than this value will be allocated "              \
2582           "using malloc. Larger allocations will use mmap.")                \
2583                                                                             \
2584   experimental(bool, AlwaysAtomicAccesses, false,                           \
2585           "Accesses to all variables should always be atomic")              \
2586                                                                             \
2587   diagnostic(bool, UseUnalignedAccesses, false,                             \
2588           "Use unaligned memory accesses in Unsafe")                        \
2589                                                                             \
2590   product_pd(bool, PreserveFramePointer,                                    \
2591              "Use the FP register for holding the frame pointer "           \
2592              "and not as a general purpose register.")                      \
2593                                                                             \
2594   diagnostic(bool, CheckIntrinsics, true,                                   \
2595              "When a class C is loaded, check that "                        \
2596              "(1) all intrinsics defined by the VM for class C are present "\
2597              "in the loaded class file and are marked with the "            \
2598              "@HotSpotIntrinsicCandidate annotation, that "                 \
2599              "(2) there is an intrinsic registered for all loaded methods " \
2600              "that are annotated with the @HotSpotIntrinsicCandidate "      \
2601              "annotation, and that "                                        \
2602              "(3) no orphan methods exist for class C (i.e., methods for "  \
2603              "which the VM declares an intrinsic but that are not declared "\
2604              "in the loaded class C. "                                      \
2605              "Check (3) is available only in debug builds.")                \
2606                                                                             \
2607   diagnostic_pd(intx, InitArrayShortSize,                                   \
2608           "Threshold small size (in bytes) for clearing arrays. "           \
2609           "Anything this size or smaller may get converted to discrete "    \
2610           "scalar stores.")                                                 \
2611           range(0, max_intx)                                                \
2612           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
2613                                                                             \
2614   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
2615              "Disable backwards compatibility for compile commands.")       \
2616                                                                             \
2617   diagnostic(bool, CompilerDirectivesPrint, false,                          \
2618              "Print compiler directives on installation.")                  \
2619   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
2620              "Limit on number of compiler directives.")                     \
2621                                                                             \
2622   product(ccstr, AllocateHeapAt, NULL,                                      \
2623           "Path to the directoy where a temporary file will be created "    \
2624           "to use as the backing store for Java Heap.")                     \
2625                                                                             \
2626   develop(bool, VerifyMetaspace, false,                                     \
2627           "Verify metaspace on chunk movements.")                           \
2628                                                                             \
2629   diagnostic(bool, ShowRegistersOnAssert, false,                            \
2630           "On internal errors, include registers in error report.")         \
2631                                                                             \
2632   experimental(bool, UseSwitchProfiling, true,                              \
2633           "leverage profiling for table/lookup switch")                     \
2634                                                                             \
2635   JFR_ONLY(product(bool, FlightRecorder, false,                             \
2636           "Enable Flight Recorder"))                                        \
2637                                                                             \
2638   JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL,                      \
2639           "Flight Recorder options"))                                       \
2640                                                                             \
2641   JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
2642           "Start flight recording with options"))                           \
2643                                                                             \
2644   experimental(bool, UseFastUnorderedTimeStamps, false,                     \
2645           "Use platform unstable time where supported for timestamps only") \
2646                                                                             \
2647   product(bool, EnableValhalla, false,                                      \
2648           "Enable experimental Valhalla features")                          \
2649                                                                             \
2650   product_pd(bool, ValueTypePassFieldsAsArgs,                               \
2651              "Pass each value type field as an argument at calls")          \
2652                                                                             \
2653   product_pd(bool, ValueTypeReturnedAsFields,                               \
2654             "return fields instead of a value type reference")              \
2655                                                                             \
2656   develop(bool, StressValueTypeReturnedAsFields, false,                     \
2657           "stress return of fields instead of a value type reference")      \
2658                                                                             \
2659   experimental(bool, UsePointerPerturbation, false,                         \
2660                "With value types, use the perturbation scheme for acmp")    \
2661 
2662 
2663 #define VM_FLAGS(develop,                                                   \
2664                  develop_pd,                                                \
2665                  product,                                                   \
2666                  product_pd,                                                \
2667                  diagnostic,                                                \
2668                  diagnostic_pd,                                             \
2669                  experimental,                                              \
2670                  notproduct,                                                \
2671                  manageable,                                                \
2672                  product_rw,                                                \
2673                  lp64_product,                                              \
2674                  range,                                                     \
2675                  constraint,                                                \
2676                  writeable)                                                 \
2677                                                                             \
2678   RUNTIME_FLAGS(                                                            \
2679     develop,                                                                \
2680     develop_pd,                                                             \
2681     product,                                                                \
2682     product_pd,                                                             \
2683     diagnostic,                                                             \
2684     diagnostic_pd,                                                          \
2685     experimental,                                                           \
2686     notproduct,                                                             \
2687     manageable,                                                             \
2688     product_rw,                                                             \
2689     lp64_product,                                                           \
2690     range,                                                                  \
2691     constraint,                                                             \
2692     writeable)                                                              \
2693                                                                             \
2694   GC_FLAGS(                                                                 \
2695     develop,                                                                \
2696     develop_pd,                                                             \
2697     product,                                                                \
2698     product_pd,                                                             \
2699     diagnostic,                                                             \
2700     diagnostic_pd,                                                          \
2701     experimental,                                                           \
2702     notproduct,                                                             \
2703     manageable,                                                             \
2704     product_rw,                                                             \
2705     lp64_product,                                                           \
2706     range,                                                                  \
2707     constraint,                                                             \
2708     writeable)                                                              \
2709 
2710 /*
2711  *  Macros for factoring of globals
2712  */
2713 
2714 // Interface macros
2715 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
2716 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
2717 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
2718 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
2719 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
2720 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
2721 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
2722 #ifdef PRODUCT
2723 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
2724 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
2725 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
2726 #else
2727 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
2728 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
2729 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
2730 #endif // PRODUCT
2731 // Special LP64 flags, product only needed for now.
2732 #ifdef _LP64
2733 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
2734 #else
2735 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
2736 #endif // _LP64
2737 
2738 // Implementation macros
2739 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
2740 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
2741 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
2742 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
2743 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
2744 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
2745 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
2746 #ifdef PRODUCT
2747 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
2748 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
2749 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
2750 #else
2751 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
2752 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
2753 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
2754 #endif // PRODUCT
2755 #ifdef _LP64
2756 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
2757 #else
2758 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
2759 #endif // _LP64
2760 
2761 // Only materialize src code for range checking when required, ignore otherwise
2762 #define IGNORE_RANGE(a, b)
2763 // Only materialize src code for contraint checking when required, ignore otherwise
2764 #define IGNORE_CONSTRAINT(func,type)
2765 
2766 #define IGNORE_WRITEABLE(type)
2767 
2768 VM_FLAGS(DECLARE_DEVELOPER_FLAG, \
2769          DECLARE_PD_DEVELOPER_FLAG, \
2770          DECLARE_PRODUCT_FLAG, \
2771          DECLARE_PD_PRODUCT_FLAG, \
2772          DECLARE_DIAGNOSTIC_FLAG, \
2773          DECLARE_PD_DIAGNOSTIC_FLAG, \
2774          DECLARE_EXPERIMENTAL_FLAG, \
2775          DECLARE_NOTPRODUCT_FLAG, \
2776          DECLARE_MANAGEABLE_FLAG, \
2777          DECLARE_PRODUCT_RW_FLAG, \
2778          DECLARE_LP64_PRODUCT_FLAG, \
2779          IGNORE_RANGE, \
2780          IGNORE_CONSTRAINT, \
2781          IGNORE_WRITEABLE)
2782 
2783 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
2784                  DECLARE_PD_DEVELOPER_FLAG, \
2785                  DECLARE_PRODUCT_FLAG, \
2786                  DECLARE_PD_PRODUCT_FLAG, \
2787                  DECLARE_DIAGNOSTIC_FLAG, \
2788                  DECLARE_PD_DIAGNOSTIC_FLAG, \
2789                  DECLARE_NOTPRODUCT_FLAG, \
2790                  IGNORE_RANGE, \
2791                  IGNORE_CONSTRAINT, \
2792                  IGNORE_WRITEABLE)
2793 
2794 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
2795            DECLARE_PRODUCT_FLAG, \
2796            DECLARE_DIAGNOSTIC_FLAG, \
2797            DECLARE_EXPERIMENTAL_FLAG, \
2798            DECLARE_NOTPRODUCT_FLAG, \
2799            IGNORE_RANGE, \
2800            IGNORE_CONSTRAINT, \
2801            IGNORE_WRITEABLE)
2802 
2803 // Extensions
2804 
2805 #include "runtime/globals_ext.hpp"
2806 
2807 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP