1 /*
   2  * Copyright (c) 1997, 2015, 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 "utilities/debug.hpp"
  29 
  30 // use this for flags that are true per default in the tiered build
  31 // but false in non-tiered builds, and vice versa
  32 #ifdef TIERED
  33 #define  trueInTiered true
  34 #define falseInTiered false
  35 #else
  36 #define  trueInTiered false
  37 #define falseInTiered true
  38 #endif
  39 
  40 #ifdef TARGET_ARCH_x86
  41 # include "globals_x86.hpp"
  42 #endif
  43 #ifdef TARGET_ARCH_sparc
  44 # include "globals_sparc.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_zero
  47 # include "globals_zero.hpp"
  48 #endif
  49 #ifdef TARGET_ARCH_arm
  50 # include "globals_arm.hpp"
  51 #endif
  52 #ifdef TARGET_ARCH_ppc
  53 # include "globals_ppc.hpp"
  54 #endif
  55 #ifdef TARGET_ARCH_aarch64
  56 # include "globals_aarch64.hpp"
  57 #endif
  58 #ifdef TARGET_OS_FAMILY_linux
  59 # include "globals_linux.hpp"
  60 #endif
  61 #ifdef TARGET_OS_FAMILY_solaris
  62 # include "globals_solaris.hpp"
  63 #endif
  64 #ifdef TARGET_OS_FAMILY_windows
  65 # include "globals_windows.hpp"
  66 #endif
  67 #ifdef TARGET_OS_FAMILY_aix
  68 # include "globals_aix.hpp"
  69 #endif
  70 #ifdef TARGET_OS_FAMILY_bsd
  71 # include "globals_bsd.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_x86
  74 # include "globals_linux_x86.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_linux_sparc
  77 # include "globals_linux_sparc.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_linux_zero
  80 # include "globals_linux_zero.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_solaris_x86
  83 # include "globals_solaris_x86.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_solaris_sparc
  86 # include "globals_solaris_sparc.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_windows_x86
  89 # include "globals_windows_x86.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_linux_arm
  92 # include "globals_linux_arm.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_linux_ppc
  95 # include "globals_linux_ppc.hpp"
  96 #endif
  97 #ifdef TARGET_OS_ARCH_linux_aarch64
  98 # include "globals_linux_aarch64.hpp"
  99 #endif
 100 #ifdef TARGET_OS_ARCH_aix_ppc
 101 # include "globals_aix_ppc.hpp"
 102 #endif
 103 #ifdef TARGET_OS_ARCH_bsd_x86
 104 # include "globals_bsd_x86.hpp"
 105 #endif
 106 #ifdef TARGET_OS_ARCH_bsd_zero
 107 # include "globals_bsd_zero.hpp"
 108 #endif
 109 #ifdef COMPILER1
 110 #ifdef TARGET_ARCH_x86
 111 # include "c1_globals_x86.hpp"
 112 #endif
 113 #ifdef TARGET_ARCH_sparc
 114 # include "c1_globals_sparc.hpp"
 115 #endif
 116 #ifdef TARGET_ARCH_arm
 117 # include "c1_globals_arm.hpp"
 118 #endif
 119 #ifdef TARGET_ARCH_aarch64
 120 # include "c1_globals_aarch64.hpp"
 121 #endif
 122 #ifdef TARGET_OS_FAMILY_linux
 123 # include "c1_globals_linux.hpp"
 124 #endif
 125 #ifdef TARGET_OS_FAMILY_solaris
 126 # include "c1_globals_solaris.hpp"
 127 #endif
 128 #ifdef TARGET_OS_FAMILY_windows
 129 # include "c1_globals_windows.hpp"
 130 #endif
 131 #ifdef TARGET_OS_FAMILY_aix
 132 # include "c1_globals_aix.hpp"
 133 #endif
 134 #ifdef TARGET_OS_FAMILY_bsd
 135 # include "c1_globals_bsd.hpp"
 136 #endif
 137 #ifdef TARGET_ARCH_ppc
 138 # include "c1_globals_ppc.hpp"
 139 #endif
 140 #endif
 141 #ifdef COMPILER2
 142 #ifdef TARGET_ARCH_x86
 143 # include "c2_globals_x86.hpp"
 144 #endif
 145 #ifdef TARGET_ARCH_sparc
 146 # include "c2_globals_sparc.hpp"
 147 #endif
 148 #ifdef TARGET_ARCH_arm
 149 # include "c2_globals_arm.hpp"
 150 #endif
 151 #ifdef TARGET_ARCH_ppc
 152 # include "c2_globals_ppc.hpp"
 153 #endif
 154 #ifdef TARGET_ARCH_aarch64
 155 # include "c2_globals_aarch64.hpp"
 156 #endif
 157 #ifdef TARGET_OS_FAMILY_linux
 158 # include "c2_globals_linux.hpp"
 159 #endif
 160 #ifdef TARGET_OS_FAMILY_solaris
 161 # include "c2_globals_solaris.hpp"
 162 #endif
 163 #ifdef TARGET_OS_FAMILY_windows
 164 # include "c2_globals_windows.hpp"
 165 #endif
 166 #ifdef TARGET_OS_FAMILY_aix
 167 # include "c2_globals_aix.hpp"
 168 #endif
 169 #ifdef TARGET_OS_FAMILY_bsd
 170 # include "c2_globals_bsd.hpp"
 171 #endif
 172 #endif
 173 #ifdef SHARK
 174 #ifdef TARGET_ARCH_zero
 175 # include "shark_globals_zero.hpp"
 176 #endif
 177 #endif
 178 
 179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 180 define_pd_global(bool, BackgroundCompilation,        false);
 181 define_pd_global(bool, UseTLAB,                      false);
 182 define_pd_global(bool, CICompileOSR,                 false);
 183 define_pd_global(bool, UseTypeProfile,               false);
 184 define_pd_global(bool, UseOnStackReplacement,        false);
 185 define_pd_global(bool, InlineIntrinsics,             false);
 186 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 187 define_pd_global(bool, ProfileInterpreter,           false);
 188 define_pd_global(bool, ProfileTraps,                 false);
 189 define_pd_global(bool, TieredCompilation,            false);
 190 
 191 define_pd_global(intx, CompileThreshold,             0);
 192 
 193 define_pd_global(intx, OnStackReplacePercentage,     0);
 194 define_pd_global(bool, ResizeTLAB,                   false);
 195 define_pd_global(intx, FreqInlineSize,               0);
 196 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
 197 define_pd_global(intx, InlineClassNatives,           true);
 198 define_pd_global(intx, InlineUnsafeOps,              true);
 199 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 200 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 201 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
 202 define_pd_global(intx, ProfiledCodeHeapSize,         0);
 203 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
 204 
 205 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 206 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 207 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 208 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
 209 define_pd_global(bool, NeverActAsServerClassMachine, true);
 210 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 211 #define CI_COMPILER_COUNT 0
 212 #else
 213 
 214 #ifdef COMPILER2
 215 #define CI_COMPILER_COUNT 2
 216 #else
 217 #define CI_COMPILER_COUNT 1
 218 #endif // COMPILER2
 219 
 220 #endif // no compilers
 221 
 222 // string type aliases used only in this file
 223 typedef const char* ccstr;
 224 typedef const char* ccstrlist;   // represents string arguments which accumulate
 225 
 226 struct Flag {
 227   enum Flags {
 228     // value origin
 229     DEFAULT          = 0,
 230     COMMAND_LINE     = 1,
 231     ENVIRON_VAR      = 2,
 232     CONFIG_FILE      = 3,
 233     MANAGEMENT       = 4,
 234     ERGONOMIC        = 5,
 235     ATTACH_ON_DEMAND = 6,
 236     INTERNAL         = 7,
 237 
 238     LAST_VALUE_ORIGIN = INTERNAL,
 239     VALUE_ORIGIN_BITS = 4,
 240     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 241 
 242     // flag kind
 243     KIND_PRODUCT            = 1 << 4,
 244     KIND_MANAGEABLE         = 1 << 5,
 245     KIND_DIAGNOSTIC         = 1 << 6,
 246     KIND_EXPERIMENTAL       = 1 << 7,
 247     KIND_NOT_PRODUCT        = 1 << 8,
 248     KIND_DEVELOP            = 1 << 9,
 249     KIND_PLATFORM_DEPENDENT = 1 << 10,
 250     KIND_READ_WRITE         = 1 << 11,
 251     KIND_C1                 = 1 << 12,
 252     KIND_C2                 = 1 << 13,
 253     KIND_ARCH               = 1 << 14,
 254     KIND_SHARK              = 1 << 15,
 255     KIND_LP64_PRODUCT       = 1 << 16,
 256     KIND_COMMERCIAL         = 1 << 17,
 257 
 258     KIND_MASK = ~VALUE_ORIGIN_MASK
 259   };
 260 
 261   const char* _type;
 262   const char* _name;
 263   void* _addr;
 264   NOT_PRODUCT(const char* _doc;)
 265   Flags _flags;
 266 
 267   // points to all Flags static array
 268   static Flag* flags;
 269 
 270   // number of flags
 271   static size_t numFlags;
 272 
 273   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 274   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 275 
 276   void check_writable();
 277 
 278   bool is_bool() const;
 279   bool get_bool() const;
 280   void set_bool(bool value);
 281 
 282   bool is_int() const;
 283   int get_int() const;
 284   void set_int(int value);
 285 
 286   bool is_uint() const;
 287   uint get_uint() const;
 288   void set_uint(uint value);
 289 
 290   bool is_intx() const;
 291   intx get_intx() const;
 292   void set_intx(intx value);
 293 
 294   bool is_uintx() const;
 295   uintx get_uintx() const;
 296   void set_uintx(uintx value);
 297 
 298   bool is_uint64_t() const;
 299   uint64_t get_uint64_t() const;
 300   void set_uint64_t(uint64_t value);
 301 
 302   bool is_size_t() const;
 303   size_t get_size_t() const;
 304   void set_size_t(size_t value);
 305 
 306   bool is_double() const;
 307   double get_double() const;
 308   void set_double(double value);
 309 
 310   bool is_ccstr() const;
 311   bool ccstr_accumulates() const;
 312   ccstr get_ccstr() const;
 313   void set_ccstr(ccstr value);
 314 
 315   Flags get_origin();
 316   void set_origin(Flags origin);
 317 
 318   bool is_default();
 319   bool is_ergonomic();
 320   bool is_command_line();
 321 
 322   bool is_product() const;
 323   bool is_manageable() const;
 324   bool is_diagnostic() const;
 325   bool is_experimental() const;
 326   bool is_notproduct() const;
 327   bool is_develop() const;
 328   bool is_read_write() const;
 329   bool is_commercial() const;
 330 
 331   bool is_constant_in_binary() const;
 332 
 333   bool is_unlocker() const;
 334   bool is_unlocked() const;
 335   bool is_writeable() const;
 336   bool is_external() const;
 337 
 338   bool is_unlocker_ext() const;
 339   bool is_unlocked_ext() const;
 340   bool is_writeable_ext() const;
 341   bool is_external_ext() const;
 342 
 343   void unlock_diagnostic();
 344 
 345   void get_locked_message(char*, int) const;
 346   void get_locked_message_ext(char*, int) const;
 347 
 348   void print_on(outputStream* st, bool withComments = false );
 349   void print_kind(outputStream* st);
 350   void print_as_flag(outputStream* st);
 351 };
 352 
 353 // debug flags control various aspects of the VM and are global accessible
 354 
 355 // use FlagSetting to temporarily change some debug flag
 356 // e.g. FlagSetting fs(DebugThisAndThat, true);
 357 // restored to previous value upon leaving scope
 358 class FlagSetting {
 359   bool val;
 360   bool* flag;
 361  public:
 362   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 363   ~FlagSetting()                       { *flag = val; }
 364 };
 365 
 366 
 367 class CounterSetting {
 368   intx* counter;
 369  public:
 370   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 371   ~CounterSetting()         { (*counter)--; }
 372 };
 373 
 374 class IntFlagSetting {
 375   int val;
 376   int* flag;
 377  public:
 378   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 379   ~IntFlagSetting()                     { *flag = val; }
 380 };
 381 
 382 class UIntFlagSetting {
 383   uint val;
 384   uint* flag;
 385  public:
 386   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 387   ~UIntFlagSetting()                       { *flag = val; }
 388 };
 389 
 390 class UIntXFlagSetting {
 391   uintx val;
 392   uintx* flag;
 393  public:
 394   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 395   ~UIntXFlagSetting()                         { *flag = val; }
 396 };
 397 
 398 class DoubleFlagSetting {
 399   double val;
 400   double* flag;
 401  public:
 402   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 403   ~DoubleFlagSetting()                           { *flag = val; }
 404 };
 405 
 406 class SizeTFlagSetting {
 407   size_t val;
 408   size_t* flag;
 409  public:
 410   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 411   ~SizeTFlagSetting()                           { *flag = val; }
 412 };
 413 
 414 
 415 class CommandLineFlags {
 416  public:
 417   static bool boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 418   static bool boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false)      { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
 419   static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 420   static bool boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 421 
 422   static bool intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 423   static bool intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false)      { return intAt(name, strlen(name), value, allow_locked, return_flag); }
 424   static bool intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 425   static bool intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 426 
 427   static bool uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 428   static bool uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false)      { return uintAt(name, strlen(name), value, allow_locked, return_flag); }
 429   static bool uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 430   static bool uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 431 
 432   static bool intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 433   static bool intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false)      { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
 434   static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 435   static bool intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 436 
 437   static bool uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 438   static bool uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false)    { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
 439   static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 440   static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 441 
 442   static bool size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 443   static bool size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false)    { return size_tAt(name, strlen(name), value, allow_locked, return_flag); }
 444   static bool size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 445   static bool size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 446 
 447   static bool uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 448   static bool uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); }
 449   static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 450   static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 451 
 452   static bool doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 453   static bool doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false)    { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
 454   static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 455   static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 456 
 457   static bool ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 458   static bool ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false)    { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
 459   // Contract:  Flag will make private copy of the incoming value.
 460   // Outgoing value is always malloc-ed, and caller MUST call free.
 461   static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 462   static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 463 
 464   // Returns false if name is not a command line flag.
 465   static bool wasSetOnCmdline(const char* name, bool* value);
 466   static void printSetFlags(outputStream* out);
 467 
 468   static void printFlags(outputStream* out, bool withComments);
 469 
 470   static void verify() PRODUCT_RETURN;
 471 };
 472 
 473 // use this for flags that are true by default in the debug version but
 474 // false in the optimized version, and vice versa
 475 #ifdef ASSERT
 476 #define trueInDebug  true
 477 #define falseInDebug false
 478 #else
 479 #define trueInDebug  false
 480 #define falseInDebug true
 481 #endif
 482 
 483 // use this for flags that are true per default in the product build
 484 // but false in development builds, and vice versa
 485 #ifdef PRODUCT
 486 #define trueInProduct  true
 487 #define falseInProduct false
 488 #else
 489 #define trueInProduct  false
 490 #define falseInProduct true
 491 #endif
 492 
 493 #ifdef JAVASE_EMBEDDED
 494 #define falseInEmbedded false
 495 #else
 496 #define falseInEmbedded true
 497 #endif
 498 
 499 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 500 // product flags are always settable / visible
 501 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 502 
 503 // A flag must be declared with one of the following types:
 504 // bool, intx, uintx, size_t, ccstr, double, or uint64_t.
 505 // The type "ccstr" is an alias for "const char*" and is used
 506 // only in this file, because the macrology requires single-token type names.
 507 
 508 // Note: Diagnostic options not meant for VM tuning or for product modes.
 509 // They are to be used for VM quality assurance or field diagnosis
 510 // of VM bugs.  They are hidden so that users will not be encouraged to
 511 // try them as if they were VM ordinary execution options.  However, they
 512 // are available in the product version of the VM.  Under instruction
 513 // from support engineers, VM customers can turn them on to collect
 514 // diagnostic information about VM problems.  To use a VM diagnostic
 515 // option, you must first specify +UnlockDiagnosticVMOptions.
 516 // (This master switch also affects the behavior of -Xprintflags.)
 517 //
 518 // experimental flags are in support of features that are not
 519 //    part of the officially supported product, but are available
 520 //    for experimenting with. They could, for example, be performance
 521 //    features that may not have undergone full or rigorous QA, but which may
 522 //    help performance in some cases and released for experimentation
 523 //    by the community of users and developers. This flag also allows one to
 524 //    be able to build a fully supported product that nonetheless also
 525 //    ships with some unsupported, lightly tested, experimental features.
 526 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 527 //    UnlockExperimentalVMOptions flag, which allows the control and
 528 //    modification of the experimental flags.
 529 //
 530 // Nota bene: neither diagnostic nor experimental options should be used casually,
 531 //    and they are not supported on production loads, except under explicit
 532 //    direction from support engineers.
 533 //
 534 // manageable flags are writeable external product flags.
 535 //    They are dynamically writeable through the JDK management interface
 536 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 537 //    These flags are external exported interface (see CCC).  The list of
 538 //    manageable flags can be queried programmatically through the management
 539 //    interface.
 540 //
 541 //    A flag can be made as "manageable" only if
 542 //    - the flag is defined in a CCC as an external exported interface.
 543 //    - the VM implementation supports dynamic setting of the flag.
 544 //      This implies that the VM must *always* query the flag variable
 545 //      and not reuse state related to the flag state at any given time.
 546 //    - you want the flag to be queried programmatically by the customers.
 547 //
 548 // product_rw flags are writeable internal product flags.
 549 //    They are like "manageable" flags but for internal/private use.
 550 //    The list of product_rw flags are internal/private flags which
 551 //    may be changed/removed in a future release.  It can be set
 552 //    through the management interface to get/set value
 553 //    when the name of flag is supplied.
 554 //
 555 //    A flag can be made as "product_rw" only if
 556 //    - the VM implementation supports dynamic setting of the flag.
 557 //      This implies that the VM must *always* query the flag variable
 558 //      and not reuse state related to the flag state at any given time.
 559 //
 560 // Note that when there is a need to support develop flags to be writeable,
 561 // it can be done in the same way as product_rw.
 562 
 563 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 564                                                                             \
 565   lp64_product(bool, UseCompressedOops, false,                              \
 566           "Use 32-bit object references in 64-bit VM. "                     \
 567           "lp64_product means flag is always constant in 32 bit VM")        \
 568                                                                             \
 569   lp64_product(bool, UseCompressedClassPointers, false,                     \
 570           "Use 32-bit class pointers in 64-bit VM. "                        \
 571           "lp64_product means flag is always constant in 32 bit VM")        \
 572                                                                             \
 573   notproduct(bool, CheckCompressedOops, true,                               \
 574           "Generate checks in encoding/decoding code in debug VM")          \
 575                                                                             \
 576   product_pd(size_t, HeapBaseMinAddress,                                    \
 577           "OS specific low limit for heap base address")                    \
 578                                                                             \
 579   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 580           "Heap allocation steps through preferred address regions to find" \
 581           " where it can allocate the heap. Number of steps to take per "   \
 582           "region.")                                                        \
 583                                                                             \
 584   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 585           "Print compressed oops base address and encoding mode")           \
 586                                                                             \
 587   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 588           "Default object alignment in bytes, 8 is minimum")                \
 589                                                                             \
 590   product(bool, AssumeMP, false,                                            \
 591           "Instruct the VM to assume multiple processors are available")    \
 592                                                                             \
 593   /* UseMembar is theoretically a temp flag used for memory barrier         \
 594    * removal testing.  It was supposed to be removed before FCS but has     \
 595    * been re-added (see 6401008) */                                         \
 596   product_pd(bool, UseMembar,                                               \
 597           "(Unstable) Issues membars on thread state transitions")          \
 598                                                                             \
 599   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 600           "Clean the chunk pool asynchronously")                            \
 601                                                                             \
 602   experimental(bool, AlwaysSafeConstructors, false,                         \
 603           "Force safe construction, as if all fields are final.")           \
 604                                                                             \
 605   /* Temporary: See 6948537 */                                              \
 606   experimental(bool, UseMemSetInBOT, true,                                  \
 607           "(Unstable) uses memset in BOT updates in GC code")               \
 608                                                                             \
 609   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 610           "Enable normal processing of flags relating to field diagnostics")\
 611                                                                             \
 612   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 613           "Enable normal processing of flags relating to experimental "     \
 614           "features")                                                       \
 615                                                                             \
 616   product(bool, JavaMonitorsInStackTrace, true,                             \
 617           "Print information about Java monitor locks when the stacks are"  \
 618           "dumped")                                                         \
 619                                                                             \
 620   product_pd(bool, UseLargePages,                                           \
 621           "Use large page memory")                                          \
 622                                                                             \
 623   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 624           "Allocate large pages individually for better affinity")          \
 625                                                                             \
 626   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 627           "Fail large pages individual allocation")                         \
 628                                                                             \
 629   product(bool, UseLargePagesInMetaspace, false,                            \
 630           "Use large page memory in metaspace. "                            \
 631           "Only used if UseLargePages is enabled.")                         \
 632                                                                             \
 633   develop(bool, TracePageSizes, false,                                      \
 634           "Trace page size selection and usage")                            \
 635                                                                             \
 636   product(bool, UseNUMA, false,                                             \
 637           "Use NUMA if available")                                          \
 638                                                                             \
 639   product(bool, UseNUMAInterleaving, false,                                 \
 640           "Interleave memory across NUMA nodes if available")               \
 641                                                                             \
 642   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 643           "Granularity to use for NUMA interleaving on Windows OS")         \
 644                                                                             \
 645   product(bool, ForceNUMA, false,                                           \
 646           "Force NUMA optimizations on single-node/UMA systems")            \
 647                                                                             \
 648   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 649           "Percentage (0-100) used to weight the current sample when "      \
 650           "computing exponentially decaying average for "                   \
 651           "AdaptiveNUMAChunkSizing")                                        \
 652                                                                             \
 653   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 654           "Do not reallocate more than this amount per collection")         \
 655                                                                             \
 656   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 657           "Enable adaptive chunk sizing for NUMA")                          \
 658                                                                             \
 659   product(bool, NUMAStats, false,                                           \
 660           "Print NUMA stats in detailed heap information")                  \
 661                                                                             \
 662   product(uintx, NUMAPageScanRate, 256,                                     \
 663           "Maximum number of pages to include in the page scan procedure")  \
 664                                                                             \
 665   product_pd(bool, NeedsDeoptSuspend,                                       \
 666           "True for register window machines (sparc/ia64)")                 \
 667                                                                             \
 668   product(intx, UseSSE, 99,                                                 \
 669           "Highest supported SSE instructions set on x86/x64")              \
 670                                                                             \
 671   product(bool, UseAES, false,                                              \
 672           "Control whether AES instructions can be used on x86/x64")        \
 673                                                                             \
 674   product(bool, UseSHA, false,                                              \
 675           "Control whether SHA instructions can be used on SPARC")          \
 676                                                                             \
 677   product(bool, UseGHASHIntrinsics, false,                                  \
 678           "Use intrinsics for GHASH versions of crypto")                    \
 679                                                                             \
 680   product(size_t, LargePageSizeInBytes, 0,                                  \
 681           "Large page size (0 to let VM choose the page size)")             \
 682                                                                             \
 683   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 684           "Use large pages if maximum heap is at least this big")           \
 685                                                                             \
 686   product(bool, ForceTimeHighResolution, false,                             \
 687           "Using high time resolution (for Win32 only)")                    \
 688                                                                             \
 689   develop(bool, TraceItables, false,                                        \
 690           "Trace initialization and use of itables")                        \
 691                                                                             \
 692   develop(bool, TracePcPatching, false,                                     \
 693           "Trace usage of frame::patch_pc")                                 \
 694                                                                             \
 695   develop(bool, TraceJumps, false,                                          \
 696           "Trace assembly jumps in thread ring buffer")                     \
 697                                                                             \
 698   develop(bool, TraceRelocator, false,                                      \
 699           "Trace the bytecode relocator")                                   \
 700                                                                             \
 701   develop(bool, TraceLongCompiles, false,                                   \
 702           "Print out every time compilation is longer than "                \
 703           "a given threshold")                                              \
 704                                                                             \
 705   develop(bool, SafepointALot, false,                                       \
 706           "Generate a lot of safepoints. This works with "                  \
 707           "GuaranteedSafepointInterval")                                    \
 708                                                                             \
 709   product_pd(bool, BackgroundCompilation,                                   \
 710           "A thread requesting compilation is not blocked during "          \
 711           "compilation")                                                    \
 712                                                                             \
 713   product(bool, PrintVMQWaitTime, false,                                    \
 714           "Print out the waiting time in VM operation queue")               \
 715                                                                             \
 716   develop(bool, TraceOopMapGeneration, false,                               \
 717           "Show OopMapGeneration")                                          \
 718                                                                             \
 719   product(bool, MethodFlushing, true,                                       \
 720           "Reclamation of zombie and not-entrant methods")                  \
 721                                                                             \
 722   develop(bool, VerifyStack, false,                                         \
 723           "Verify stack of each thread when it is entering a runtime call") \
 724                                                                             \
 725   diagnostic(bool, ForceUnreachable, false,                                 \
 726           "Make all non code cache addresses to be unreachable by "         \
 727           "forcing use of 64bit literal fixups")                            \
 728                                                                             \
 729   notproduct(bool, StressDerivedPointers, false,                            \
 730           "Force scavenge when a derived pointer is detected on stack "     \
 731           "after rtm call")                                                 \
 732                                                                             \
 733   develop(bool, TraceDerivedPointers, false,                                \
 734           "Trace traversal of derived pointers on stack")                   \
 735                                                                             \
 736   notproduct(bool, TraceCodeBlobStacks, false,                              \
 737           "Trace stack-walk of codeblobs")                                  \
 738                                                                             \
 739   product(bool, PrintJNIResolving, false,                                   \
 740           "Used to implement -v:jni")                                       \
 741                                                                             \
 742   notproduct(bool, PrintRewrites, false,                                    \
 743           "Print methods that are being rewritten")                         \
 744                                                                             \
 745   product(bool, UseInlineCaches, true,                                      \
 746           "Use Inline Caches for virtual calls ")                           \
 747                                                                             \
 748   develop(bool, InlineArrayCopy, true,                                      \
 749           "Inline arraycopy native that is known to be part of "            \
 750           "base library DLL")                                               \
 751                                                                             \
 752   develop(bool, InlineObjectHash, true,                                     \
 753           "Inline Object::hashCode() native that is known to be part "      \
 754           "of base library DLL")                                            \
 755                                                                             \
 756   develop(bool, InlineNatives, true,                                        \
 757           "Inline natives that are known to be part of base library DLL")   \
 758                                                                             \
 759   develop(bool, InlineMathNatives, true,                                    \
 760           "Inline SinD, CosD, etc.")                                        \
 761                                                                             \
 762   develop(bool, InlineClassNatives, true,                                   \
 763           "Inline Class.isInstance, etc")                                   \
 764                                                                             \
 765   develop(bool, InlineThreadNatives, true,                                  \
 766           "Inline Thread.currentThread, etc")                               \
 767                                                                             \
 768   develop(bool, InlineUnsafeOps, true,                                      \
 769           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
 770                                                                             \
 771   product(bool, CriticalJNINatives, true,                                   \
 772           "Check for critical JNI entry points")                            \
 773                                                                             \
 774   notproduct(bool, StressCriticalJNINatives, false,                         \
 775           "Exercise register saving code in critical natives")              \
 776                                                                             \
 777   product(bool, UseSSE42Intrinsics, false,                                  \
 778           "SSE4.2 versions of intrinsics")                                  \
 779                                                                             \
 780   product(bool, UseAESIntrinsics, false,                                    \
 781           "Use intrinsics for AES versions of crypto")                      \
 782                                                                             \
 783   product(bool, UseSHA1Intrinsics, false,                                   \
 784           "Use intrinsics for SHA-1 crypto hash function")                  \
 785                                                                             \
 786   product(bool, UseSHA256Intrinsics, false,                                 \
 787           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions")   \
 788                                                                             \
 789   product(bool, UseSHA512Intrinsics, false,                                 \
 790           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions")   \
 791                                                                             \
 792   product(bool, UseCRC32Intrinsics, false,                                  \
 793           "use intrinsics for java.util.zip.CRC32")                         \
 794                                                                             \
 795   develop(bool, TraceCallFixup, false,                                      \
 796           "Trace all call fixups")                                          \
 797                                                                             \
 798   develop(bool, DeoptimizeALot, false,                                      \
 799           "Deoptimize at every exit from the runtime system")               \
 800                                                                             \
 801   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 802           "A comma separated list of bcis to deoptimize at")                \
 803                                                                             \
 804   product(bool, DeoptimizeRandom, false,                                    \
 805           "Deoptimize random frames on random exit from the runtime system")\
 806                                                                             \
 807   notproduct(bool, ZombieALot, false,                                       \
 808           "Create zombies (non-entrant) at exit from the runtime system")   \
 809                                                                             \
 810   product(bool, UnlinkSymbolsALot, false,                                   \
 811           "Unlink unreferenced symbols from the symbol table at safepoints")\
 812                                                                             \
 813   notproduct(bool, WalkStackALot, false,                                    \
 814           "Trace stack (no print) at every exit from the runtime system")   \
 815                                                                             \
 816   product(bool, Debugging, false,                                           \
 817           "Set when executing debug methods in debug.cpp "                  \
 818           "(to prevent triggering assertions)")                             \
 819                                                                             \
 820   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 821           "Enable strict checks that safepoints cannot happen for threads " \
 822           "that use No_Safepoint_Verifier")                                 \
 823                                                                             \
 824   notproduct(bool, VerifyLastFrame, false,                                  \
 825           "Verify oops on last frame on entry to VM")                       \
 826                                                                             \
 827   develop(bool, TraceHandleAllocation, false,                               \
 828           "Print out warnings when suspiciously many handles are allocated")\
 829                                                                             \
 830   product(bool, FailOverToOldVerifier, true,                                \
 831           "Fail over to old verifier when split verifier fails")            \
 832                                                                             \
 833   develop(bool, ShowSafepointMsgs, false,                                   \
 834           "Show message about safepoint synchronization")                   \
 835                                                                             \
 836   product(bool, SafepointTimeout, false,                                    \
 837           "Time out and warn or fail after SafepointTimeoutDelay "          \
 838           "milliseconds if failed to reach safepoint")                      \
 839                                                                             \
 840   develop(bool, DieOnSafepointTimeout, false,                               \
 841           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 842                                                                             \
 843   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 844   /* typically, at most a few retries are needed */                         \
 845   product(intx, SuspendRetryCount, 50,                                      \
 846           "Maximum retry count for an external suspend request")            \
 847                                                                             \
 848   product(intx, SuspendRetryDelay, 5,                                       \
 849           "Milliseconds to delay per retry (* current_retry_count)")        \
 850                                                                             \
 851   product(bool, AssertOnSuspendWaitFailure, false,                          \
 852           "Assert/Guarantee on external suspend wait failure")              \
 853                                                                             \
 854   product(bool, TraceSuspendWaitFailures, false,                            \
 855           "Trace external suspend wait failures")                           \
 856                                                                             \
 857   product(bool, MaxFDLimit, true,                                           \
 858           "Bump the number of file descriptors to maximum in Solaris")      \
 859                                                                             \
 860   diagnostic(bool, LogEvents, true,                                         \
 861           "Enable the various ring buffer event logs")                      \
 862                                                                             \
 863   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 864           "Number of ring buffer event logs")                               \
 865                                                                             \
 866   product(bool, BytecodeVerificationRemote, true,                           \
 867           "Enable the Java bytecode verifier for remote classes")           \
 868                                                                             \
 869   product(bool, BytecodeVerificationLocal, false,                           \
 870           "Enable the Java bytecode verifier for local classes")            \
 871                                                                             \
 872   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 873           "Force exceptions on FP stack under/overflow")                    \
 874                                                                             \
 875   develop(bool, VerifyStackAtCalls, false,                                  \
 876           "Verify that the stack pointer is unchanged after calls")         \
 877                                                                             \
 878   develop(bool, TraceJavaAssertions, false,                                 \
 879           "Trace java language assertions")                                 \
 880                                                                             \
 881   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 882           "Temporary - see javaClasses.cpp")                                \
 883                                                                             \
 884   notproduct(bool, PrintMallocFree, false,                                  \
 885           "Trace calls to C heap malloc/free allocation")                   \
 886                                                                             \
 887   product(bool, PrintOopAddress, false,                                     \
 888           "Always print the location of the oop")                           \
 889                                                                             \
 890   notproduct(bool, VerifyCodeCache, false,                                  \
 891           "Verify code cache on memory allocation/deallocation")            \
 892                                                                             \
 893   develop(bool, ZapDeadCompiledLocals, false,                               \
 894           "Zap dead locals in compiler frames")                             \
 895                                                                             \
 896   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 897           "Zap dead locals (old version, zaps all frames when "             \
 898           "entering the VM")                                                \
 899                                                                             \
 900   notproduct(bool, CheckOopishValues, false,                                \
 901           "Warn if value contains oop (requires ZapDeadLocals)")            \
 902                                                                             \
 903   develop(bool, UseMallocOnly, false,                                       \
 904           "Use only malloc/free for allocation (no resource area/arena)")   \
 905                                                                             \
 906   develop(bool, PrintMalloc, false,                                         \
 907           "Print all malloc/free calls")                                    \
 908                                                                             \
 909   develop(bool, PrintMallocStatistics, false,                               \
 910           "Print malloc/free statistics")                                   \
 911                                                                             \
 912   develop(bool, ZapResourceArea, trueInDebug,                               \
 913           "Zap freed resource/arena space with 0xABABABAB")                 \
 914                                                                             \
 915   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 916           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 917                                                                             \
 918   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 919           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 920                                                                             \
 921   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 922           "Zap allocated/freed stack segments with 0xFADFADED")             \
 923                                                                             \
 924   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 925           "Zap unused heap space with 0xBAADBABE")                          \
 926                                                                             \
 927   develop(bool, TraceZapUnusedHeapArea, false,                              \
 928           "Trace zapping of unused heap space")                             \
 929                                                                             \
 930   develop(bool, CheckZapUnusedHeapArea, false,                              \
 931           "Check zapping of unused heap space")                             \
 932                                                                             \
 933   develop(bool, ZapFillerObjects, trueInDebug,                              \
 934           "Zap filler objects with 0xDEAFBABE")                             \
 935                                                                             \
 936   develop(bool, PrintVMMessages, true,                                      \
 937           "Print VM messages on console")                                   \
 938                                                                             \
 939   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 940           "Print the time the application has been running")                \
 941                                                                             \
 942   product(bool, PrintGCApplicationStoppedTime, false,                       \
 943           "Print the time the application has been stopped")                \
 944                                                                             \
 945   diagnostic(bool, VerboseVerification, false,                              \
 946           "Display detailed verification details")                          \
 947                                                                             \
 948   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 949           "If > 0, provokes an error after VM initialization; the value "   \
 950           "determines which error to provoke. See test_error_handler() "    \
 951           "in debug.cpp.")                                                  \
 952                                                                             \
 953   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 954           "If > 0, provokes an error inside VM error handler (a secondary " \
 955           "crash). see test_error_handler() in debug.cpp.")                 \
 956                                                                             \
 957   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 958           "If true, tests SafeFetch inside error handler.")                 \
 959                                                                             \
 960   develop(bool, Verbose, false,                                             \
 961           "Print additional debugging information from other modes")        \
 962                                                                             \
 963   develop(bool, PrintMiscellaneous, false,                                  \
 964           "Print uncategorized debugging information (requires +Verbose)")  \
 965                                                                             \
 966   develop(bool, WizardMode, false,                                          \
 967           "Print much more debugging information")                          \
 968                                                                             \
 969   product(bool, ShowMessageBoxOnError, false,                               \
 970           "Keep process alive on VM fatal error")                           \
 971                                                                             \
 972   product(bool, CreateCoredumpOnCrash, true,                                \
 973           "Create core/mini dump on VM fatal error")                        \
 974                                                                             \
 975   product_pd(bool, UseOSErrorReporting,                                     \
 976           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 977                                                                             \
 978   product(bool, SuppressFatalErrorMessage, false,                           \
 979           "Report NO fatal error message (avoid deadlock)")                 \
 980                                                                             \
 981   product(ccstrlist, OnError, "",                                           \
 982           "Run user-defined commands on fatal error; see VMError.cpp "      \
 983           "for examples")                                                   \
 984                                                                             \
 985   product(ccstrlist, OnOutOfMemoryError, "",                                \
 986           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 987                                                                             \
 988   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 989           "Dump heap to file before any major stop-the-world GC")           \
 990                                                                             \
 991   manageable(bool, HeapDumpAfterFullGC, false,                              \
 992           "Dump heap to file after any major stop-the-world GC")            \
 993                                                                             \
 994   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 995           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 996                                                                             \
 997   manageable(ccstr, HeapDumpPath, NULL,                                     \
 998           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 999           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
1000           "in the working directory)")                                      \
1001                                                                             \
1002   develop(size_t, SegmentedHeapDumpThreshold, 2*G,                          \
1003           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
1004           "when the heap usage is larger than this")                        \
1005                                                                             \
1006   develop(size_t, HeapDumpSegmentSize, 1*G,                                 \
1007           "Approximate segment size when generating a segmented heap dump") \
1008                                                                             \
1009   develop(bool, BreakAtWarning, false,                                      \
1010           "Execute breakpoint upon encountering VM warning")                \
1011                                                                             \
1012   develop(bool, TraceVMOperation, false,                                    \
1013           "Trace VM operations")                                            \
1014                                                                             \
1015   develop(bool, UseFakeTimers, false,                                       \
1016           "Tell whether the VM should use system time or a fake timer")     \
1017                                                                             \
1018   product(ccstr, NativeMemoryTracking, "off",                               \
1019           "Native memory tracking options")                                 \
1020                                                                             \
1021   diagnostic(bool, PrintNMTStatistics, false,                               \
1022           "Print native memory tracking summary data if it is on")          \
1023                                                                             \
1024   diagnostic(bool, LogCompilation, false,                                   \
1025           "Log compilation activity in detail to LogFile")                  \
1026                                                                             \
1027   product(bool, PrintCompilation, false,                                    \
1028           "Print compilations")                                             \
1029                                                                             \
1030   diagnostic(bool, TraceNMethodInstalls, false,                             \
1031           "Trace nmethod installation")                                     \
1032                                                                             \
1033   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1034           "0: do not allow scavengable oops in the code cache; "            \
1035           "1: allow scavenging from the code cache; "                       \
1036           "2: emit as many constants as the compiler can see")              \
1037                                                                             \
1038   product(bool, AlwaysRestoreFPU, false,                                    \
1039           "Restore the FPU control word after every JNI call (expensive)")  \
1040                                                                             \
1041   diagnostic(bool, PrintCompilation2, false,                                \
1042           "Print additional statistics per compilation")                    \
1043                                                                             \
1044   diagnostic(bool, PrintAdapterHandlers, false,                             \
1045           "Print code generated for i2c/c2i adapters")                      \
1046                                                                             \
1047   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1048           "Verify that i2c/c2i adapters are called properly")               \
1049                                                                             \
1050   develop(bool, VerifyAdapterSharing, false,                                \
1051           "Verify that the code for shared adapters is the equivalent")     \
1052                                                                             \
1053   diagnostic(bool, PrintAssembly, false,                                    \
1054           "Print assembly code (using external disassembler.so)")           \
1055                                                                             \
1056   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1057           "Print options string passed to disassembler.so")                 \
1058                                                                             \
1059   diagnostic(bool, PrintNMethods, false,                                    \
1060           "Print assembly code for nmethods when generated")                \
1061                                                                             \
1062   diagnostic(bool, PrintNativeNMethods, false,                              \
1063           "Print assembly code for native nmethods when generated")         \
1064                                                                             \
1065   develop(bool, PrintDebugInfo, false,                                      \
1066           "Print debug information for all nmethods when generated")        \
1067                                                                             \
1068   develop(bool, PrintRelocations, false,                                    \
1069           "Print relocation information for all nmethods when generated")   \
1070                                                                             \
1071   develop(bool, PrintDependencies, false,                                   \
1072           "Print dependency information for all nmethods when generated")   \
1073                                                                             \
1074   develop(bool, PrintExceptionHandlers, false,                              \
1075           "Print exception handler tables for all nmethods when generated") \
1076                                                                             \
1077   develop(bool, StressCompiledExceptionHandlers, false,                     \
1078           "Exercise compiled exception handlers")                           \
1079                                                                             \
1080   develop(bool, InterceptOSException, false,                                \
1081           "Start debugger when an implicit OS (e.g. NULL) "                 \
1082           "exception happens")                                              \
1083                                                                             \
1084   product(bool, PrintCodeCache, false,                                      \
1085           "Print the code cache memory usage when exiting")                 \
1086                                                                             \
1087   develop(bool, PrintCodeCache2, false,                                     \
1088           "Print detailed usage information on the code cache when exiting")\
1089                                                                             \
1090   product(bool, PrintCodeCacheOnCompilation, false,                         \
1091           "Print the code cache memory usage each time a method is "        \
1092           "compiled")                                                       \
1093                                                                             \
1094   diagnostic(bool, PrintStubCode, false,                                    \
1095           "Print generated stub code")                                      \
1096                                                                             \
1097   product(bool, StackTraceInThrowable, true,                                \
1098           "Collect backtrace in throwable when exception happens")          \
1099                                                                             \
1100   product(bool, OmitStackTraceInFastThrow, true,                            \
1101           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1102                                                                             \
1103   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1104           "Print bytecode statistics when dumping profiler output")         \
1105                                                                             \
1106   product(bool, ProfilerRecordPC, false,                                    \
1107           "Collect ticks for each 16 byte interval of compiled code")       \
1108                                                                             \
1109   product(bool, ProfileVM, false,                                           \
1110           "Profile ticks that fall within VM (either in the VM Thread "     \
1111           "or VM code called through stubs)")                               \
1112                                                                             \
1113   product(bool, ProfileIntervals, false,                                    \
1114           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1115                                                                             \
1116   notproduct(bool, ProfilerCheckIntervals, false,                           \
1117           "Collect and print information on spacing of profiler ticks")     \
1118                                                                             \
1119   product(bool, PrintWarnings, true,                                        \
1120           "Print JVM warnings to output stream")                            \
1121                                                                             \
1122   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1123           "Print warnings for stalled SpinLocks")                           \
1124                                                                             \
1125   product(bool, RegisterFinalizersAtInit, true,                             \
1126           "Register finalizable objects at end of Object.<init> or "        \
1127           "after allocation")                                               \
1128                                                                             \
1129   develop(bool, RegisterReferences, true,                                   \
1130           "Tell whether the VM should register soft/weak/final/phantom "    \
1131           "references")                                                     \
1132                                                                             \
1133   develop(bool, IgnoreRewrites, false,                                      \
1134           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1135           "This is unsafe!")                                                \
1136                                                                             \
1137   develop(bool, PrintCodeCacheExtension, false,                             \
1138           "Print extension of code cache")                                  \
1139                                                                             \
1140   develop(bool, UsePrivilegedStack, true,                                   \
1141           "Enable the security JVM functions")                              \
1142                                                                             \
1143   develop(bool, ProtectionDomainVerification, true,                         \
1144           "Verify protection domain before resolution in system dictionary")\
1145                                                                             \
1146   product(bool, ClassUnloading, true,                                       \
1147           "Do unloading of classes")                                        \
1148                                                                             \
1149   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1150           "Do unloading of classes with a concurrent marking cycle")        \
1151                                                                             \
1152   develop(bool, DisableStartThread, false,                                  \
1153           "Disable starting of additional Java threads "                    \
1154           "(for debugging only)")                                           \
1155                                                                             \
1156   develop(bool, MemProfiling, false,                                        \
1157           "Write memory usage profiling to log file")                       \
1158                                                                             \
1159   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1160           "Print the system dictionary at exit")                            \
1161                                                                             \
1162   experimental(intx, PredictedLoadedClassCount, 0,                          \
1163           "Experimental: Tune loaded class cache starting size")            \
1164                                                                             \
1165   diagnostic(bool, UnsyncloadClass, false,                                  \
1166           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1167           "class loader must call VM synchronized for findClass "           \
1168           "and defineClass.")                                               \
1169                                                                             \
1170   product(bool, AlwaysLockClassLoader, false,                               \
1171           "Require the VM to acquire the class loader lock before calling " \
1172           "loadClass() even for class loaders registering "                 \
1173           "as parallel capable")                                            \
1174                                                                             \
1175   product(bool, AllowParallelDefineClass, false,                            \
1176           "Allow parallel defineClass requests for class loaders "          \
1177           "registering as parallel capable")                                \
1178                                                                             \
1179   product(bool, MustCallLoadClassInternal, false,                           \
1180           "Call loadClassInternal() rather than loadClass()")               \
1181                                                                             \
1182   product_pd(bool, DontYieldALot,                                           \
1183           "Throw away obvious excess yield calls")                          \
1184                                                                             \
1185   product_pd(bool, ConvertSleepToYield,                                     \
1186           "Convert sleep(0) to thread yield "                               \
1187           "(may be off for Solaris to improve GUI)")                        \
1188                                                                             \
1189   product(bool, ConvertYieldToSleep, false,                                 \
1190           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1191           "behavior")                                                       \
1192                                                                             \
1193   develop(bool, UseDetachedThreads, true,                                   \
1194           "Use detached threads that are recycled upon termination "        \
1195           "(for Solaris only)")                                             \
1196                                                                             \
1197   product(bool, UseLWPSynchronization, true,                                \
1198           "Use LWP-based instead of libthread-based synchronization "       \
1199           "(SPARC only)")                                                   \
1200                                                                             \
1201   experimental(ccstr, SyncKnobs, NULL,                                      \
1202                "(Unstable) Various monitor synchronization tunables")       \
1203                                                                             \
1204   experimental(intx, EmitSync, 0,                                           \
1205                "(Unsafe, Unstable) "                                        \
1206                "Control emission of inline sync fast-path code")            \
1207                                                                             \
1208   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1209                                                                             \
1210   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1211                                                                             \
1212   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1213                "Experimental Sync flags")                                   \
1214                                                                             \
1215   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1216                                                                             \
1217   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1218                                                                             \
1219   experimental(intx, hashCode, 5,                                           \
1220                "(Unstable) select hashCode generation algorithm")           \
1221                                                                             \
1222   experimental(intx, WorkAroundNPTLTimedWaitHang, 1,                        \
1223                "(Unstable, Linux-specific) "                                \
1224                "avoid NPTL-FUTEX hang pthread_cond_timedwait")              \
1225                                                                             \
1226   product(bool, FilterSpuriousWakeups, true,                                \
1227           "When true prevents OS-level spurious, or premature, wakeups "    \
1228           "from Object.wait (Ignored for Windows)")                         \
1229                                                                             \
1230   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1231                                                                             \
1232   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1233                                                                             \
1234   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1235                                                                             \
1236   develop(bool, UsePthreads, false,                                         \
1237           "Use pthread-based instead of libthread-based synchronization "   \
1238           "(SPARC only)")                                                   \
1239                                                                             \
1240   product(bool, ReduceSignalUsage, false,                                   \
1241           "Reduce the use of OS signals in Java and/or the VM")             \
1242                                                                             \
1243   develop_pd(bool, ShareVtableStubs,                                        \
1244           "Share vtable stubs (smaller code but worse branch prediction")   \
1245                                                                             \
1246   develop(bool, LoadLineNumberTables, true,                                 \
1247           "Tell whether the class file parser loads line number tables")    \
1248                                                                             \
1249   develop(bool, LoadLocalVariableTables, true,                              \
1250           "Tell whether the class file parser loads local variable tables") \
1251                                                                             \
1252   develop(bool, LoadLocalVariableTypeTables, true,                          \
1253           "Tell whether the class file parser loads local variable type"    \
1254           "tables")                                                         \
1255                                                                             \
1256   product(bool, AllowUserSignalHandlers, false,                             \
1257           "Do not complain if the application installs signal handlers "    \
1258           "(Solaris & Linux only)")                                         \
1259                                                                             \
1260   product(bool, UseSignalChaining, true,                                    \
1261           "Use signal-chaining to invoke signal handlers installed "        \
1262           "by the application (Solaris & Linux only)")                      \
1263                                                                             \
1264   product(bool, UseAltSigs, false,                                          \
1265           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1266           "internal signals (Solaris only)")                                \
1267                                                                             \
1268   product(bool, AllowJNIEnvProxy, false,                                    \
1269           "Allow JNIEnv proxies for jdbx")                                  \
1270                                                                             \
1271   product(bool, JNIDetachReleasesMonitors, true,                            \
1272           "JNI DetachCurrentThread releases monitors owned by thread")      \
1273                                                                             \
1274   product(bool, RestoreMXCSROnJNICalls, false,                              \
1275           "Restore MXCSR when returning from JNI calls")                    \
1276                                                                             \
1277   product(bool, CheckJNICalls, false,                                       \
1278           "Verify all arguments to JNI calls")                              \
1279                                                                             \
1280   product(bool, CheckEndorsedAndExtDirs, false,                             \
1281           "Verify the endorsed and extension directories are not used")     \
1282                                                                             \
1283   product(bool, UseFastJNIAccessors, true,                                  \
1284           "Use optimized versions of Get<Primitive>Field")                  \
1285                                                                             \
1286   product(intx, MaxJNILocalCapacity, 65536,                                 \
1287           "Maximum allowable local JNI handle capacity to "                 \
1288           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1289           "where <= 0 is unlimited, default: 65536")                        \
1290                                                                             \
1291   product(bool, EagerXrunInit, false,                                       \
1292           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1293           "but not all -Xrun libraries may support the state of the VM "    \
1294           "at this time")                                                   \
1295                                                                             \
1296   product(bool, PreserveAllAnnotations, false,                              \
1297           "Preserve RuntimeInvisibleAnnotations as well "                   \
1298           "as RuntimeVisibleAnnotations")                                   \
1299                                                                             \
1300   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1301           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1302                                                                             \
1303   product(bool, LazyBootClassLoader, true,                                  \
1304           "Enable/disable lazy opening of boot class path entries")         \
1305                                                                             \
1306   product(bool, UseXMMForArrayCopy, false,                                  \
1307           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1308                                                                             \
1309   product(intx, FieldsAllocationStyle, 1,                                   \
1310           "0 - type based with oops first, 1 - with oops last, "            \
1311           "2 - oops in super and sub classes are together")                 \
1312                                                                             \
1313   product(bool, CompactFields, true,                                        \
1314           "Allocate nonstatic fields in gaps between previous fields")      \
1315                                                                             \
1316   notproduct(bool, PrintFieldLayout, false,                                 \
1317           "Print field layout for each class")                              \
1318                                                                             \
1319   product(intx, ContendedPaddingWidth, 128,                                 \
1320           "How many bytes to pad the fields/classes marked @Contended with")\
1321                                                                             \
1322   product(bool, EnableContended, true,                                      \
1323           "Enable @Contended annotation support")                           \
1324                                                                             \
1325   product(bool, RestrictContended, true,                                    \
1326           "Restrict @Contended to trusted classes")                         \
1327                                                                             \
1328   product(bool, UseBiasedLocking, true,                                     \
1329           "Enable biased locking in JVM")                                   \
1330                                                                             \
1331   product(intx, BiasedLockingStartupDelay, 4000,                            \
1332           "Number of milliseconds to wait before enabling biased locking")  \
1333                                                                             \
1334   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1335           "Print statistics of biased locking in JVM")                      \
1336                                                                             \
1337   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1338           "Threshold of number of revocations per type to try to "          \
1339           "rebias all objects in the heap of that type")                    \
1340                                                                             \
1341   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1342           "Threshold of number of revocations per type to permanently "     \
1343           "revoke biases of all objects in the heap of that type")          \
1344                                                                             \
1345   product(intx, BiasedLockingDecayTime, 25000,                              \
1346           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1347           "type after previous bulk rebias")                                \
1348                                                                             \
1349   /* tracing */                                                             \
1350                                                                             \
1351   notproduct(bool, TraceRuntimeCalls, false,                                \
1352           "Trace run-time calls")                                           \
1353                                                                             \
1354   develop(bool, TraceJNICalls, false,                                       \
1355           "Trace JNI calls")                                                \
1356                                                                             \
1357   develop(bool, StressRewriter, false,                                      \
1358           "Stress linktime bytecode rewriting")                             \
1359                                                                             \
1360   notproduct(bool, TraceJVMCalls, false,                                    \
1361           "Trace JVM calls")                                                \
1362                                                                             \
1363   product(ccstr, TraceJVMTI, NULL,                                          \
1364           "Trace flags for JVMTI functions and events")                     \
1365                                                                             \
1366   /* This option can change an EMCP method into an obsolete method. */      \
1367   /* This can affect tests that except specific methods to be EMCP. */      \
1368   /* This option should be used with caution. */                            \
1369   product(bool, StressLdcRewrite, false,                                    \
1370           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1371                                                                             \
1372   product(intx, TraceRedefineClasses, 0,                                    \
1373           "Trace level for JVMTI RedefineClasses")                          \
1374                                                                             \
1375   /* change to false by default sometime after Mustang */                   \
1376   product(bool, VerifyMergedCPBytecodes, true,                              \
1377           "Verify bytecodes after RedefineClasses constant pool merging")   \
1378                                                                             \
1379   develop(bool, TraceJNIHandleAllocation, false,                            \
1380           "Trace allocation/deallocation of JNI handle blocks")             \
1381                                                                             \
1382   develop(bool, TraceBytecodes, false,                                      \
1383           "Trace bytecode execution")                                       \
1384                                                                             \
1385   develop(bool, TraceClassInitialization, false,                            \
1386           "Trace class initialization")                                     \
1387                                                                             \
1388   product(bool, TraceExceptions, false,                                     \
1389           "Trace exceptions")                                               \
1390                                                                             \
1391   develop(bool, TraceICs, false,                                            \
1392           "Trace inline cache changes")                                     \
1393                                                                             \
1394   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1395           "Trace method invocation counter overflow")                       \
1396                                                                             \
1397   develop(bool, TraceInlineCacheClearing, false,                            \
1398           "Trace clearing of inline caches in nmethods")                    \
1399                                                                             \
1400   develop(bool, TraceDependencies, false,                                   \
1401           "Trace dependencies")                                             \
1402                                                                             \
1403   develop(bool, VerifyDependencies, trueInDebug,                            \
1404           "Exercise and verify the compilation dependency mechanism")       \
1405                                                                             \
1406   develop(bool, TraceNewOopMapGeneration, false,                            \
1407           "Trace OopMapGeneration")                                         \
1408                                                                             \
1409   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1410           "Trace OopMapGeneration: print detailed cell states")             \
1411                                                                             \
1412   develop(bool, TimeOopMap, false,                                          \
1413           "Time calls to GenerateOopMap::compute_map() in sum")             \
1414                                                                             \
1415   develop(bool, TimeOopMap2, false,                                         \
1416           "Time calls to GenerateOopMap::compute_map() individually")       \
1417                                                                             \
1418   develop(bool, TraceMonitorMismatch, false,                                \
1419           "Trace monitor matching failures during OopMapGeneration")        \
1420                                                                             \
1421   develop(bool, TraceOopMapRewrites, false,                                 \
1422           "Trace rewriting of method oops during oop map generation")       \
1423                                                                             \
1424   develop(bool, TraceSafepoint, false,                                      \
1425           "Trace safepoint operations")                                     \
1426                                                                             \
1427   develop(bool, TraceICBuffer, false,                                       \
1428           "Trace usage of IC buffer")                                       \
1429                                                                             \
1430   develop(bool, TraceCompiledIC, false,                                     \
1431           "Trace changes of compiled IC")                                   \
1432                                                                             \
1433   notproduct(bool, TraceZapDeadLocals, false,                               \
1434           "Trace zapping dead locals")                                      \
1435                                                                             \
1436   develop(bool, TraceStartupTime, false,                                    \
1437           "Trace setup time")                                               \
1438                                                                             \
1439   develop(bool, TraceProtectionDomainVerification, false,                   \
1440           "Trace protection domain verification")                           \
1441                                                                             \
1442   develop(bool, TraceClearedExceptions, false,                              \
1443           "Print when an exception is forcibly cleared")                    \
1444                                                                             \
1445   product(bool, TraceClassResolution, false,                                \
1446           "Trace all constant pool resolutions (for debugging)")            \
1447                                                                             \
1448   product(bool, TraceBiasedLocking, false,                                  \
1449           "Trace biased locking in JVM")                                    \
1450                                                                             \
1451   product(bool, TraceMonitorInflation, false,                               \
1452           "Trace monitor inflation in JVM")                                 \
1453                                                                             \
1454   /* gc */                                                                  \
1455                                                                             \
1456   product(bool, UseSerialGC, false,                                         \
1457           "Use the Serial garbage collector")                               \
1458                                                                             \
1459   product(bool, UseG1GC, false,                                             \
1460           "Use the Garbage-First garbage collector")                        \
1461                                                                             \
1462   product(bool, UseParallelGC, false,                                       \
1463           "Use the Parallel Scavenge garbage collector")                    \
1464                                                                             \
1465   product(bool, UseParallelOldGC, false,                                    \
1466           "Use the Parallel Old garbage collector")                         \
1467                                                                             \
1468   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1469           "How often should we maximally compact the heap (not allowing "   \
1470           "any dead space)")                                                \
1471                                                                             \
1472   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1473           "The collection count for the first maximum compaction")          \
1474                                                                             \
1475   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1476           "Use maximum compaction in the Parallel Old garbage collector "   \
1477           "for a system GC")                                                \
1478                                                                             \
1479   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1480           "The mean used by the parallel compact dead wood "                \
1481           "limiter (a number between 0-100)")                               \
1482                                                                             \
1483   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1484           "The standard deviation used by the parallel compact dead wood "  \
1485           "limiter (a number between 0-100)")                               \
1486                                                                             \
1487   product(uintx, ParallelGCThreads, 0,                                      \
1488           "Number of parallel threads parallel gc will use")                \
1489                                                                             \
1490   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1491           "Dynamically choose the number of parallel threads "              \
1492           "parallel gc will use")                                           \
1493                                                                             \
1494   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1495           "Force dynamic selection of the number of "                       \
1496           "parallel threads parallel gc will use to aid debugging")         \
1497                                                                             \
1498   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1499           "Size of heap (bytes) per GC thread used in calculating the "     \
1500           "number of GC threads")                                           \
1501                                                                             \
1502   product(bool, TraceDynamicGCThreads, false,                               \
1503           "Trace the dynamic GC thread usage")                              \
1504                                                                             \
1505   develop(bool, ParallelOldGCSplitALot, false,                              \
1506           "Provoke splitting (copying data from a young gen space to "      \
1507           "multiple destination spaces)")                                   \
1508                                                                             \
1509   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1510           "How often to provoke splitting a young gen space")               \
1511                                                                             \
1512   product(uintx, ConcGCThreads, 0,                                          \
1513           "Number of threads concurrent gc will use")                       \
1514                                                                             \
1515   product(size_t, YoungPLABSize, 4096,                                      \
1516           "Size of young gen promotion LAB's (in HeapWords)")               \
1517                                                                             \
1518   product(size_t, OldPLABSize, 1024,                                        \
1519           "Size of old gen promotion LAB's (in HeapWords), or Number        \
1520           of blocks to attempt to claim when refilling CMS LAB's")          \
1521                                                                             \
1522   product(uintx, GCTaskTimeStampEntries, 200,                               \
1523           "Number of time stamp entries per gc worker thread")              \
1524                                                                             \
1525   product(bool, AlwaysTenure, false,                                        \
1526           "Always tenure objects in eden (ParallelGC only)")                \
1527                                                                             \
1528   product(bool, NeverTenure, false,                                         \
1529           "Never tenure objects in eden, may tenure on overflow "           \
1530           "(ParallelGC only)")                                              \
1531                                                                             \
1532   product(bool, ScavengeBeforeFullGC, true,                                 \
1533           "Scavenge youngest generation before each full GC.")              \
1534                                                                             \
1535   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1536           "Allow scavenges to occur when to-space contains objects")        \
1537                                                                             \
1538   product(bool, UseConcMarkSweepGC, false,                                  \
1539           "Use Concurrent Mark-Sweep GC in the old generation")             \
1540                                                                             \
1541   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1542           "A System.gc() request invokes a concurrent collection; "         \
1543           "(effective only when using concurrent collectors)")              \
1544                                                                             \
1545   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1546           "A System.gc() request invokes a concurrent collection and "      \
1547           "also unloads classes during such a concurrent gc cycle "         \
1548           "(effective only when UseConcMarkSweepGC)")                       \
1549                                                                             \
1550   product(bool, GCLockerInvokesConcurrent, false,                           \
1551           "The exit of a JNI critical section necessitating a scavenge, "   \
1552           "also kicks off a background concurrent collection")              \
1553                                                                             \
1554   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1555           "How much the GC can expand the eden by while the GC locker "     \
1556           "is active (as a percentage)")                                    \
1557                                                                             \
1558   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1559           "Number of times to retry allocations when "                      \
1560           "blocked by the GC locker")                                       \
1561                                                                             \
1562   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1563           "Use adaptive free lists in the CMS generation")                  \
1564                                                                             \
1565   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1566           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1567                                                                             \
1568   product(bool, UseCMSBestFit, true,                                        \
1569           "Use CMS best fit allocation strategy")                           \
1570                                                                             \
1571   product(bool, UseParNewGC, false,                                         \
1572           "Use parallel threads in the new generation")                     \
1573                                                                             \
1574   product(bool, PrintTaskqueue, false,                                      \
1575           "Print taskqueue statistics for parallel collectors")             \
1576                                                                             \
1577   product(bool, PrintTerminationStats, false,                               \
1578           "Print termination statistics for parallel collectors")           \
1579                                                                             \
1580   product(uintx, ParallelGCBufferWastePct, 10,                              \
1581           "Wasted fraction of parallel allocation buffer")                  \
1582                                                                             \
1583   product(uintx, TargetPLABWastePct, 10,                                    \
1584           "Target wasted space in last buffer as percent of overall "       \
1585           "allocation")                                                     \
1586                                                                             \
1587   product(uintx, PLABWeight, 75,                                            \
1588           "Percentage (0-100) used to weight the current sample when "      \
1589           "computing exponentially decaying average for ResizePLAB")        \
1590                                                                             \
1591   product(bool, ResizePLAB, true,                                           \
1592           "Dynamically resize (survivor space) promotion LAB's")            \
1593                                                                             \
1594   product(bool, PrintPLAB, false,                                           \
1595           "Print (survivor space) promotion LAB's sizing decisions")        \
1596                                                                             \
1597   product(intx, ParGCArrayScanChunk, 50,                                    \
1598           "Scan a subset of object array and push remainder, if array is "  \
1599           "bigger than this")                                               \
1600                                                                             \
1601   product(bool, ParGCUseLocalOverflow, false,                               \
1602           "Instead of a global overflow list, use local overflow stacks")   \
1603                                                                             \
1604   product(bool, ParGCTrimOverflow, true,                                    \
1605           "Eagerly trim the local overflow lists "                          \
1606           "(when ParGCUseLocalOverflow)")                                   \
1607                                                                             \
1608   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1609           "Simulate work queue overflow in ParNew")                         \
1610                                                                             \
1611   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1612           "An `interval' counter that determines how frequently "           \
1613           "we simulate overflow; a smaller number increases frequency")     \
1614                                                                             \
1615   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1616           "The desired number of objects to claim from the overflow list")  \
1617                                                                             \
1618   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1619           "The number of strides per worker thread that we divide up the "  \
1620           "card table scanning work into")                                  \
1621                                                                             \
1622   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1623           "The number of cards in each chunk of the parallel chunks used "  \
1624           "during card table scanning")                                     \
1625                                                                             \
1626   product(uintx, OldPLABWeight, 50,                                         \
1627           "Percentage (0-100) used to weight the current sample when "      \
1628           "computing exponentially decaying average for resizing "          \
1629           "OldPLABSize")                                                    \
1630                                                                             \
1631   product(bool, ResizeOldPLAB, true,                                        \
1632           "Dynamically resize (old gen) promotion LAB's")                   \
1633                                                                             \
1634   product(bool, PrintOldPLAB, false,                                        \
1635           "Print (old gen) promotion LAB's sizing decisions")               \
1636                                                                             \
1637   product(size_t, CMSOldPLABMin, 16,                                        \
1638           "Minimum size of CMS gen promotion LAB caches per worker "        \
1639           "per block size")                                                 \
1640                                                                             \
1641   product(size_t, CMSOldPLABMax, 1024,                                      \
1642           "Maximum size of CMS gen promotion LAB caches per worker "        \
1643           "per block size")                                                 \
1644                                                                             \
1645   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1646           "Nominal number of refills of CMS gen promotion LAB cache "       \
1647           "per worker per block size")                                      \
1648                                                                             \
1649   product(bool, CMSOldPLABResizeQuicker, false,                             \
1650           "React on-the-fly during a scavenge to a sudden "                 \
1651           "change in block demand rate")                                    \
1652                                                                             \
1653   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1654           "The tolerance of the phase-change detector for on-the-fly "      \
1655           "PLAB resizing during a scavenge")                                \
1656                                                                             \
1657   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1658           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1659           "during a scavenge")                                              \
1660                                                                             \
1661   product(bool, AlwaysPreTouch, false,                                      \
1662           "Force all freshly committed pages to be pre-touched")            \
1663                                                                             \
1664   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1665           "The maximum size of young gen chosen by default per GC worker "  \
1666           "thread available")                                               \
1667                                                                             \
1668   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1669           "Percentage (0-100) used to add conservatism when computing the " \
1670           "duty cycle")                                                     \
1671                                                                             \
1672   product(uintx, CMSExpAvgFactor, 50,                                       \
1673           "Percentage (0-100) used to weight the current sample when "      \
1674           "computing exponential averages for CMS statistics")              \
1675                                                                             \
1676   product(uintx, CMS_FLSWeight, 75,                                         \
1677           "Percentage (0-100) used to weight the current sample when "      \
1678           "computing exponentially decaying averages for CMS FLS "          \
1679           "statistics")                                                     \
1680                                                                             \
1681   product(uintx, CMS_FLSPadding, 1,                                         \
1682           "The multiple of deviation from mean to use for buffering "       \
1683           "against volatility in free list demand")                         \
1684                                                                             \
1685   product(uintx, FLSCoalescePolicy, 2,                                      \
1686           "CMS: aggressiveness level for coalescing, increasing "           \
1687           "from 0 to 4")                                                    \
1688                                                                             \
1689   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1690           "CMS: larger free blocks are always available for coalescing")    \
1691                                                                             \
1692   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1693           "CMS: the smaller the percentage the greater the coalescing "     \
1694           "force")                                                          \
1695                                                                             \
1696   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1697           "CMS: the factor by which to inflate estimated demand of small "  \
1698           "block sizes to prevent coalescing with an adjoining block")      \
1699                                                                             \
1700   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1701           "CMS: the factor by which to inflate estimated demand of large "  \
1702           "block sizes to prevent coalescing with an adjoining block")      \
1703                                                                             \
1704   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1705           "CMS: the factor by which to inflate estimated demand of small "  \
1706           "block sizes to prevent splitting to supply demand for smaller "  \
1707           "blocks")                                                         \
1708                                                                             \
1709   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1710           "CMS: the factor by which to inflate estimated demand of large "  \
1711           "block sizes to prevent splitting to supply demand for smaller "  \
1712           "blocks")                                                         \
1713                                                                             \
1714   product(bool, CMSExtrapolateSweep, false,                                 \
1715           "CMS: cushion for block demand during sweep")                     \
1716                                                                             \
1717   product(uintx, CMS_SweepWeight, 75,                                       \
1718           "Percentage (0-100) used to weight the current sample when "      \
1719           "computing exponentially decaying average for inter-sweep "       \
1720           "duration")                                                       \
1721                                                                             \
1722   product(uintx, CMS_SweepPadding, 1,                                       \
1723           "The multiple of deviation from mean to use for buffering "       \
1724           "against volatility in inter-sweep duration")                     \
1725                                                                             \
1726   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1727           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1728           "duration exceeds this threshold in milliseconds")                \
1729                                                                             \
1730   product(bool, CMSClassUnloadingEnabled, true,                             \
1731           "Whether class unloading enabled when using CMS GC")              \
1732                                                                             \
1733   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1734           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1735           "count for which classes may not be unloaded")                    \
1736                                                                             \
1737   develop(intx, CMSDictionaryChoice, 0,                                     \
1738           "Use BinaryTreeDictionary as default in the CMS generation")      \
1739                                                                             \
1740   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1741           "Replenish an indexed free list with this number of chunks")      \
1742                                                                             \
1743   product(bool, CMSReplenishIntermediate, true,                             \
1744           "Replenish all intermediate free-list caches")                    \
1745                                                                             \
1746   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1747           "When satisfying batched demand, split blocks from the "          \
1748           "IndexedFreeList whose size is a multiple of requested size")     \
1749                                                                             \
1750   product(bool, CMSLoopWarn, false,                                         \
1751           "Warn in case of excessive CMS looping")                          \
1752                                                                             \
1753   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1754           "Restore preserved marks early")                                  \
1755                                                                             \
1756   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1757           "Size of marking stack")                                          \
1758                                                                             \
1759   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1760           "Maximum size of marking stack")                                  \
1761                                                                             \
1762   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1763           "Simulate frequent marking stack / work queue overflow")          \
1764                                                                             \
1765   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1766           "An \"interval\" counter that determines how frequently "         \
1767           "to simulate overflow; a smaller number increases frequency")     \
1768                                                                             \
1769   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1770           "Maximum number of abortable preclean iterations, if > 0")        \
1771                                                                             \
1772   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1773           "Maximum time in abortable preclean (in milliseconds)")           \
1774                                                                             \
1775   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1776           "Nominal minimum work per abortable preclean iteration")          \
1777                                                                             \
1778   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1779           "Time that we sleep between iterations when not given "           \
1780           "enough work per iteration")                                      \
1781                                                                             \
1782   product(size_t, CMSRescanMultiple, 32,                                    \
1783           "Size (in cards) of CMS parallel rescan task")                    \
1784                                                                             \
1785   product(size_t, CMSConcMarkMultiple, 32,                                  \
1786           "Size (in cards) of CMS concurrent MT marking task")              \
1787                                                                             \
1788   product(bool, CMSAbortSemantics, false,                                   \
1789           "Whether abort-on-overflow semantics is implemented")             \
1790                                                                             \
1791   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1792           "Use the parallel initial mark.")                                 \
1793                                                                             \
1794   product(bool, CMSParallelRemarkEnabled, true,                             \
1795           "Whether parallel remark enabled (only if ParNewGC)")             \
1796                                                                             \
1797   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1798           "Whether parallel remark of survivor space "                      \
1799           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1800                                                                             \
1801   product(bool, CMSPLABRecordAlways, true,                                  \
1802           "Always record survivor space PLAB boundaries (effective only "   \
1803           "if CMSParallelSurvivorRemarkEnabled)")                           \
1804                                                                             \
1805   product(bool, CMSEdenChunksRecordAlways, true,                            \
1806           "Always record eden chunks used for the parallel initial mark "   \
1807           "or remark of eden")                                              \
1808                                                                             \
1809   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1810           "Print the eden and the survivor chunks used for the parallel "   \
1811           "initial mark or remark of the eden/survivor spaces")             \
1812                                                                             \
1813   product(bool, CMSConcurrentMTEnabled, true,                               \
1814           "Whether multi-threaded concurrent work enabled "                 \
1815           "(effective only if ParNewGC)")                                   \
1816                                                                             \
1817   product(bool, CMSPrecleaningEnabled, true,                                \
1818           "Whether concurrent precleaning enabled")                         \
1819                                                                             \
1820   product(uintx, CMSPrecleanIter, 3,                                        \
1821           "Maximum number of precleaning iteration passes")                 \
1822                                                                             \
1823   product(uintx, CMSPrecleanNumerator, 2,                                   \
1824           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1825           "ratio")                                                          \
1826                                                                             \
1827   product(uintx, CMSPrecleanDenominator, 3,                                 \
1828           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1829           "ratio")                                                          \
1830                                                                             \
1831   product(bool, CMSPrecleanRefLists1, true,                                 \
1832           "Preclean ref lists during (initial) preclean phase")             \
1833                                                                             \
1834   product(bool, CMSPrecleanRefLists2, false,                                \
1835           "Preclean ref lists during abortable preclean phase")             \
1836                                                                             \
1837   product(bool, CMSPrecleanSurvivors1, false,                               \
1838           "Preclean survivors during (initial) preclean phase")             \
1839                                                                             \
1840   product(bool, CMSPrecleanSurvivors2, true,                                \
1841           "Preclean survivors during abortable preclean phase")             \
1842                                                                             \
1843   product(uintx, CMSPrecleanThreshold, 1000,                                \
1844           "Do not iterate again if number of dirty cards is less than this")\
1845                                                                             \
1846   product(bool, CMSCleanOnEnter, true,                                      \
1847           "Clean-on-enter optimization for reducing number of dirty cards") \
1848                                                                             \
1849   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1850           "Choose variant (1,2) of verification following remark")          \
1851                                                                             \
1852   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1853           "If Eden size is below this, do not try to schedule remark")      \
1854                                                                             \
1855   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1856           "The Eden occupancy percentage (0-100) at which "                 \
1857           "to try and schedule remark pause")                               \
1858                                                                             \
1859   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1860           "Start sampling eden top at least before young gen "              \
1861           "occupancy reaches 1/<ratio> of the size at which "               \
1862           "we plan to schedule remark")                                     \
1863                                                                             \
1864   product(uintx, CMSSamplingGrain, 16*K,                                    \
1865           "The minimum distance between eden samples for CMS (see above)")  \
1866                                                                             \
1867   product(bool, CMSScavengeBeforeRemark, false,                             \
1868           "Attempt scavenge before the CMS remark step")                    \
1869                                                                             \
1870   develop(bool, CMSTraceSweeper, false,                                     \
1871           "Trace some actions of the CMS sweeper")                          \
1872                                                                             \
1873   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1874           "Don't drain below this size per parallel worker/thief")          \
1875                                                                             \
1876   manageable(intx, CMSWaitDuration, 2000,                                   \
1877           "Time in milliseconds that CMS thread waits for young GC")        \
1878                                                                             \
1879   develop(uintx, CMSCheckInterval, 1000,                                    \
1880           "Interval in milliseconds that CMS thread checks if it "          \
1881           "should start a collection cycle")                                \
1882                                                                             \
1883   product(bool, CMSYield, true,                                             \
1884           "Yield between steps of CMS")                                     \
1885                                                                             \
1886   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1887           "Bitmap operations should process at most this many bits "        \
1888           "between yields")                                                 \
1889                                                                             \
1890   product(bool, CMSDumpAtPromotionFailure, false,                           \
1891           "Dump useful information about the state of the CMS old "         \
1892           "generation upon a promotion failure")                            \
1893                                                                             \
1894   product(bool, CMSPrintChunksInDump, false,                                \
1895           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1896           "more detailed information about the free chunks")                \
1897                                                                             \
1898   product(bool, CMSPrintObjectsInDump, false,                               \
1899           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1900           "more detailed information about the allocated objects")          \
1901                                                                             \
1902   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1903           "Verify that all references across the FLS boundary "             \
1904           "are to valid objects")                                           \
1905                                                                             \
1906   diagnostic(bool, FLSVerifyLists, false,                                   \
1907           "Do lots of (expensive) FreeListSpace verification")              \
1908                                                                             \
1909   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1910           "Do lots of (expensive) FLS index table verification")            \
1911                                                                             \
1912   develop(bool, FLSVerifyDictionary, false,                                 \
1913           "Do lots of (expensive) FLS dictionary verification")             \
1914                                                                             \
1915   develop(bool, VerifyBlockOffsetArray, false,                              \
1916           "Do (expensive) block offset array verification")                 \
1917                                                                             \
1918   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1919           "Maintain _unallocated_block in BlockOffsetArray "                \
1920           "(currently applicable only to CMS collector)")                   \
1921                                                                             \
1922   develop(bool, TraceCMSState, false,                                       \
1923           "Trace the state of the CMS collection")                          \
1924                                                                             \
1925   product(intx, RefDiscoveryPolicy, 0,                                      \
1926           "Select type of reference discovery policy: "                     \
1927           "reference-based(0) or referent-based(1)")                        \
1928                                                                             \
1929   product(bool, ParallelRefProcEnabled, false,                              \
1930           "Enable parallel reference processing whenever possible")         \
1931                                                                             \
1932   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1933           "Enable balancing of reference processing queues")                \
1934                                                                             \
1935   product(uintx, CMSTriggerRatio, 80,                                       \
1936           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1937           "allocated before a CMS collection cycle commences")              \
1938                                                                             \
1939   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1940           "Percentage CMS generation occupancy at which to "                \
1941           "initiate CMS collection for bootstrapping collection stats")     \
1942                                                                             \
1943   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1944           "Percentage CMS generation occupancy to start a CMS collection "  \
1945           "cycle. A negative value means that CMSTriggerRatio is used")     \
1946                                                                             \
1947   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1948           "Percentage of the (entire) heap occupancy to start a "           \
1949           "concurrent GC cycle. It is used by GCs that trigger a "          \
1950           "concurrent GC cycle based on the occupancy of the entire heap, " \
1951           "not just one of the generations (e.g., G1). A value of 0 "       \
1952           "denotes 'do constant GC cycles'.")                               \
1953                                                                             \
1954   manageable(intx, CMSTriggerInterval, -1,                                  \
1955           "Commence a CMS collection cycle (at least) every so many "       \
1956           "milliseconds (0 permanently, -1 disabled)")                      \
1957                                                                             \
1958   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1959           "Only use occupancy as a criterion for starting a CMS collection")\
1960                                                                             \
1961   product(uintx, CMSIsTooFullPercentage, 98,                                \
1962           "An absolute ceiling above which CMS will always consider the "   \
1963           "unloading of classes when class unloading is enabled")           \
1964                                                                             \
1965   develop(bool, CMSTestInFreeList, false,                                   \
1966           "Check if the coalesced range is already in the "                 \
1967           "free lists as claimed")                                          \
1968                                                                             \
1969   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1970           "Check that all the garbage collected was returned to the "       \
1971           "free lists")                                                     \
1972                                                                             \
1973   notproduct(bool, ScavengeALot, false,                                     \
1974           "Force scavenge at every Nth exit from the runtime system "       \
1975           "(N=ScavengeALotInterval)")                                       \
1976                                                                             \
1977   develop(bool, FullGCALot, false,                                          \
1978           "Force full gc at every Nth exit from the runtime system "        \
1979           "(N=FullGCALotInterval)")                                         \
1980                                                                             \
1981   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1982           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1983                                                                             \
1984   product(bool, PrintPromotionFailure, false,                               \
1985           "Print additional diagnostic information following "              \
1986           "promotion failure")                                              \
1987                                                                             \
1988   notproduct(bool, PromotionFailureALot, false,                             \
1989           "Use promotion failure handling on every youngest generation "    \
1990           "collection")                                                     \
1991                                                                             \
1992   develop(uintx, PromotionFailureALotCount, 1000,                           \
1993           "Number of promotion failures occurring at PLAB "     \
1994           "refill attempts (ParNew) or promotion attempts "                 \
1995           "(other young collectors)")                                       \
1996                                                                             \
1997   develop(uintx, PromotionFailureALotInterval, 5,                           \
1998           "Total collections between promotion failures a lot")             \
1999                                                                             \
2000   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2001           "Sleep time when sleep is used for yields")                       \
2002                                                                             \
2003   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2004           "Number of yields before a sleep is done during work stealing")   \
2005                                                                             \
2006   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2007           "Number of iterations in a spin loop between checks on "          \
2008           "time out of hard spin")                                          \
2009                                                                             \
2010   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2011           "Ratio of hard spins to calls to yield")                          \
2012                                                                             \
2013   develop(uintx, ObjArrayMarkingStride, 512,                                \
2014           "Number of object array elements to push onto the marking stack " \
2015           "before pushing a continuation entry")                            \
2016                                                                             \
2017   develop(bool, MetadataAllocationFailALot, false,                          \
2018           "Fail metadata allocations at intervals controlled by "           \
2019           "MetadataAllocationFailALotInterval")                             \
2020                                                                             \
2021   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2022           "Metadata allocation failure a lot interval")                     \
2023                                                                             \
2024   develop(bool, TraceMetadataChunkAllocation, false,                        \
2025           "Trace chunk metadata allocations")                               \
2026                                                                             \
2027   product(bool, TraceMetadataHumongousAllocation, false,                    \
2028           "Trace humongous metadata allocations")                           \
2029                                                                             \
2030   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
2031           "Trace virtual space metadata allocations")                       \
2032                                                                             \
2033   notproduct(bool, ExecuteInternalVMTests, false,                           \
2034           "Enable execution of internal VM tests")                          \
2035                                                                             \
2036   notproduct(bool, VerboseInternalVMTests, false,                           \
2037           "Turn on logging for internal VM tests.")                         \
2038                                                                             \
2039   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2040                                                                             \
2041   product_pd(bool, ResizeTLAB,                                              \
2042           "Dynamically resize TLAB size for threads")                       \
2043                                                                             \
2044   product(bool, ZeroTLAB, false,                                            \
2045           "Zero out the newly created TLAB")                                \
2046                                                                             \
2047   product(bool, FastTLABRefill, true,                                       \
2048           "Use fast TLAB refill code")                                      \
2049                                                                             \
2050   product(bool, PrintTLAB, false,                                           \
2051           "Print various TLAB related information")                         \
2052                                                                             \
2053   product(bool, TLABStats, true,                                            \
2054           "Provide more detailed and expensive TLAB statistics "            \
2055           "(with PrintTLAB)")                                               \
2056                                                                             \
2057   product_pd(bool, NeverActAsServerClassMachine,                            \
2058           "Never act like a server-class machine")                          \
2059                                                                             \
2060   product(bool, AlwaysActAsServerClassMachine, false,                       \
2061           "Always act like a server-class machine")                         \
2062                                                                             \
2063   product_pd(uint64_t, MaxRAM,                                              \
2064           "Real memory size (in bytes) used to set maximum heap size")      \
2065                                                                             \
2066   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2067           "Maximum ergonomically set heap size (in bytes); zero means use " \
2068           "MaxRAM / MaxRAMFraction")                                        \
2069                                                                             \
2070   product(uintx, MaxRAMFraction, 4,                                         \
2071           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2072           "size")                                                           \
2073                                                                             \
2074   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2075           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2076           "size; deprecated: to be renamed to MaxRAMFraction")              \
2077                                                                             \
2078   product(uintx, MinRAMFraction, 2,                                         \
2079           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2080           "size on systems with small physical memory size")                \
2081                                                                             \
2082   product(uintx, InitialRAMFraction, 64,                                    \
2083           "Fraction (1/n) of real memory used for initial heap size")       \
2084                                                                             \
2085   develop(uintx, MaxVirtMemFraction, 2,                                     \
2086           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2087           "determining maximum heap size")                                  \
2088                                                                             \
2089   product(bool, UseAutoGCSelectPolicy, false,                               \
2090           "Use automatic collection selection policy")                      \
2091                                                                             \
2092   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2093           "Automatic GC selection pause threshold in milliseconds")         \
2094                                                                             \
2095   product(bool, UseAdaptiveSizePolicy, true,                                \
2096           "Use adaptive generation sizing policies")                        \
2097                                                                             \
2098   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2099           "Use adaptive survivor sizing policies")                          \
2100                                                                             \
2101   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2102           "Use adaptive young-old sizing policies at minor collections")    \
2103                                                                             \
2104   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2105           "Use adaptive young-old sizing policies at major collections")    \
2106                                                                             \
2107   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2108           "Include statistics from System.gc() for adaptive size policy")   \
2109                                                                             \
2110   product(bool, UseAdaptiveGCBoundary, false,                               \
2111           "Allow young-old boundary to move")                               \
2112                                                                             \
2113   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2114           "Trace young-old boundary moves")                                 \
2115                                                                             \
2116   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2117           "Resize the virtual spaces of the young or old generations")      \
2118                                                                             \
2119   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2120           "Policy for changing generation size for throughput goals")       \
2121                                                                             \
2122   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2123           "Adjust tenured generation to achieve a minor pause goal")        \
2124                                                                             \
2125   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2126           "Adjust young generation to achieve a major pause goal")          \
2127                                                                             \
2128   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2129           "Number of steps where heuristics is used before data is used")   \
2130                                                                             \
2131   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2132           "Number of collections before the adaptive sizing is started")    \
2133                                                                             \
2134   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2135           "Collection interval for printing information; zero means never") \
2136                                                                             \
2137   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2138           "Use adaptive minimum footprint as a goal")                       \
2139                                                                             \
2140   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2141           "Weight given to exponential resizing, between 0 and 100")        \
2142                                                                             \
2143   product(uintx, AdaptiveTimeWeight,       25,                              \
2144           "Weight given to time in adaptive policy, between 0 and 100")     \
2145                                                                             \
2146   product(uintx, PausePadding, 1,                                           \
2147           "How much buffer to keep for pause time")                         \
2148                                                                             \
2149   product(uintx, PromotedPadding, 3,                                        \
2150           "How much buffer to keep for promotion failure")                  \
2151                                                                             \
2152   product(uintx, SurvivorPadding, 3,                                        \
2153           "How much buffer to keep for survivor overflow")                  \
2154                                                                             \
2155   product(uintx, ThresholdTolerance, 10,                                    \
2156           "Allowed collection cost difference between generations")         \
2157                                                                             \
2158   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2159           "If collection costs are within margin, reduce both by full "     \
2160           "delta")                                                          \
2161                                                                             \
2162   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2163           "Adaptive size percentage change in young generation")            \
2164                                                                             \
2165   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2166           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2167                                                                             \
2168   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2169           "Decay factor to YoungedGenerationSizeSupplement")                \
2170                                                                             \
2171   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2172           "Adaptive size percentage change in tenured generation")          \
2173                                                                             \
2174   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2175           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2176                                                                             \
2177   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2178           "Decay factor to TenuredGenerationSizeIncrement")                 \
2179                                                                             \
2180   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2181           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2182           "or (G1 Only) the maximum GC time per MMU time slice")            \
2183                                                                             \
2184   product(uintx, GCPauseIntervalMillis, 0,                                  \
2185           "Time slice for MMU specification")                               \
2186                                                                             \
2187   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2188           "Adaptive size policy maximum GC minor pause time goal "          \
2189           "in millisecond")                                                 \
2190                                                                             \
2191   product(uintx, GCTimeRatio, 99,                                           \
2192           "Adaptive size policy application time to GC time ratio")         \
2193                                                                             \
2194   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2195           "Adaptive size scale down factor for shrinking")                  \
2196                                                                             \
2197   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2198           "Adaptive size decays the major cost for long major intervals")   \
2199                                                                             \
2200   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2201           "Time scale over which major costs decay")                        \
2202                                                                             \
2203   product(uintx, MinSurvivorRatio, 3,                                       \
2204           "Minimum ratio of young generation/survivor space size")          \
2205                                                                             \
2206   product(uintx, InitialSurvivorRatio, 8,                                   \
2207           "Initial ratio of young generation/survivor space size")          \
2208                                                                             \
2209   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2210           "Estimate of footprint other than Java Heap")                     \
2211                                                                             \
2212   product(bool, UseGCOverheadLimit, true,                                   \
2213           "Use policy to limit of proportion of time spent in GC "          \
2214           "before an OutOfMemory error is thrown")                          \
2215                                                                             \
2216   product(uintx, GCTimeLimit, 98,                                           \
2217           "Limit of the proportion of time spent in GC before "             \
2218           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2219                                                                             \
2220   product(uintx, GCHeapFreeLimit, 2,                                        \
2221           "Minimum percentage of free space after a full GC before an "     \
2222           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2223                                                                             \
2224   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2225           "Number of consecutive collections before gc time limit fires")   \
2226                                                                             \
2227   product(bool, PrintAdaptiveSizePolicy, false,                             \
2228           "Print information about AdaptiveSizePolicy")                     \
2229                                                                             \
2230   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2231           "How far ahead to prefetch destination area (<= 0 means off)")    \
2232                                                                             \
2233   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2234           "How far ahead to prefetch scan area (<= 0 means off)")           \
2235                                                                             \
2236   product(intx, PrefetchFieldsAhead, -1,                                    \
2237           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2238                                                                             \
2239   diagnostic(bool, VerifySilently, false,                                   \
2240           "Do not print the verification progress")                         \
2241                                                                             \
2242   diagnostic(bool, VerifyDuringStartup, false,                              \
2243           "Verify memory system before executing any Java code "            \
2244           "during VM initialization")                                       \
2245                                                                             \
2246   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2247           "Verify system before exiting")                                   \
2248                                                                             \
2249   diagnostic(bool, VerifyBeforeGC, false,                                   \
2250           "Verify memory system before GC")                                 \
2251                                                                             \
2252   diagnostic(bool, VerifyAfterGC, false,                                    \
2253           "Verify memory system after GC")                                  \
2254                                                                             \
2255   diagnostic(bool, VerifyDuringGC, false,                                   \
2256           "Verify memory system during GC (between phases)")                \
2257                                                                             \
2258   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2259           "Enable parallel memory system verification")                     \
2260                                                                             \
2261   diagnostic(bool, DeferInitialCardMark, false,                             \
2262           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2263           "may arise from new_pre_store_barrier")                           \
2264                                                                             \
2265   product(bool, UseCondCardMark, false,                                     \
2266           "Check for already marked card before updating card table")       \
2267                                                                             \
2268   diagnostic(bool, VerifyRememberedSets, false,                             \
2269           "Verify GC remembered sets")                                      \
2270                                                                             \
2271   diagnostic(bool, VerifyObjectStartArray, true,                            \
2272           "Verify GC object start array if verify before/after")            \
2273                                                                             \
2274   product(bool, DisableExplicitGC, false,                                   \
2275           "Ignore calls to System.gc()")                                    \
2276                                                                             \
2277   notproduct(bool, CheckMemoryInitialization, false,                        \
2278           "Check memory initialization")                                    \
2279                                                                             \
2280   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2281           "Bind CMS Thread to CPU if possible")                             \
2282                                                                             \
2283   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2284           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2285                                                                             \
2286   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2287           "Bind GCTaskThreads to CPUs if possible")                         \
2288                                                                             \
2289   product(bool, UseGCTaskAffinity, false,                                   \
2290           "Use worker affinity when asking for GCTasks")                    \
2291                                                                             \
2292   product(uintx, ProcessDistributionStride, 4,                              \
2293           "Stride through processors when distributing processes")          \
2294                                                                             \
2295   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2296           "Number of times the coordinator GC thread will sleep while "     \
2297           "yielding before giving up and resuming GC")                      \
2298                                                                             \
2299   product(uintx, CMSYieldSleepCount, 0,                                     \
2300           "Number of times a GC thread (minus the coordinator) "            \
2301           "will sleep while yielding before giving up and resuming GC")     \
2302                                                                             \
2303   /* gc tracing */                                                          \
2304   manageable(bool, PrintGC, false,                                          \
2305           "Print message at garbage collection")                            \
2306                                                                             \
2307   manageable(bool, PrintGCDetails, false,                                   \
2308           "Print more details at garbage collection")                       \
2309                                                                             \
2310   manageable(bool, PrintGCDateStamps, false,                                \
2311           "Print date stamps at garbage collection")                        \
2312                                                                             \
2313   manageable(bool, PrintGCTimeStamps, false,                                \
2314           "Print timestamps at garbage collection")                         \
2315                                                                             \
2316   manageable(bool, PrintGCID, true,                                         \
2317           "Print an identifier for each garbage collection")                \
2318                                                                             \
2319   product(bool, PrintGCTaskTimeStamps, false,                               \
2320           "Print timestamps for individual gc worker thread tasks")         \
2321                                                                             \
2322   develop(intx, ConcGCYieldTimeout, 0,                                      \
2323           "If non-zero, assert that GC threads yield within this "          \
2324           "number of milliseconds")                                         \
2325                                                                             \
2326   product(bool, PrintReferenceGC, false,                                    \
2327           "Print times spent handling reference objects during GC "         \
2328           "(enabled only when PrintGCDetails)")                             \
2329                                                                             \
2330   develop(bool, TraceReferenceGC, false,                                    \
2331           "Trace handling of soft/weak/final/phantom references")           \
2332                                                                             \
2333   develop(bool, TraceFinalizerRegistration, false,                          \
2334           "Trace registration of final references")                         \
2335                                                                             \
2336   notproduct(bool, TraceScavenge, false,                                    \
2337           "Trace scavenge")                                                 \
2338                                                                             \
2339   product(bool, IgnoreEmptyClassPaths, false,                               \
2340           "Ignore empty path elements in -classpath")                       \
2341                                                                             \
2342   product(bool, TraceClassPaths, false,                                     \
2343           "Trace processing of class paths")                                \
2344                                                                             \
2345   product_rw(bool, TraceClassLoading, false,                                \
2346           "Trace all classes loaded")                                       \
2347                                                                             \
2348   product(bool, TraceClassLoadingPreorder, false,                           \
2349           "Trace all classes loaded in order referenced (not loaded)")      \
2350                                                                             \
2351   product_rw(bool, TraceClassUnloading, false,                              \
2352           "Trace unloading of classes")                                     \
2353                                                                             \
2354   product_rw(bool, TraceLoaderConstraints, false,                           \
2355           "Trace loader constraints")                                       \
2356                                                                             \
2357   develop(bool, TraceClassLoaderData, false,                                \
2358           "Trace class loader loader_data lifetime")                        \
2359                                                                             \
2360   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2361           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2362           "Initial size of the boot class loader data metaspace")           \
2363                                                                             \
2364   product(bool, TraceYoungGenTime, false,                                   \
2365           "Trace accumulated time for young collection")                    \
2366                                                                             \
2367   product(bool, TraceOldGenTime, false,                                     \
2368           "Trace accumulated time for old collection")                      \
2369                                                                             \
2370   product(bool, PrintTenuringDistribution, false,                           \
2371           "Print tenuring age information")                                 \
2372                                                                             \
2373   product_rw(bool, PrintHeapAtGC, false,                                    \
2374           "Print heap layout before and after each GC")                     \
2375                                                                             \
2376   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2377           "Print extended information about the layout of the heap "        \
2378           "when -XX:+PrintHeapAtGC is set")                                 \
2379                                                                             \
2380   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2381           "Print heap layout in response to SIGBREAK")                      \
2382                                                                             \
2383   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2384           "Print a class histogram before any major stop-world GC")         \
2385                                                                             \
2386   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2387           "Print a class histogram after any major stop-world GC")          \
2388                                                                             \
2389   manageable(bool, PrintClassHistogram, false,                              \
2390           "Print a histogram of class instances")                           \
2391                                                                             \
2392   develop(bool, TraceWorkGang, false,                                       \
2393           "Trace activities of work gangs")                                 \
2394                                                                             \
2395   product(bool, TraceParallelOldGCTasks, false,                             \
2396           "Trace multithreaded GC activity")                                \
2397                                                                             \
2398   develop(bool, TraceBlockOffsetTable, false,                               \
2399           "Print BlockOffsetTable maps")                                    \
2400                                                                             \
2401   develop(bool, TraceCardTableModRefBS, false,                              \
2402           "Print CardTableModRefBS maps")                                   \
2403                                                                             \
2404   develop(bool, TraceGCTaskManager, false,                                  \
2405           "Trace actions of the GC task manager")                           \
2406                                                                             \
2407   develop(bool, TraceGCTaskQueue, false,                                    \
2408           "Trace actions of the GC task queues")                            \
2409                                                                             \
2410   diagnostic(bool, TraceGCTaskThread, false,                                \
2411           "Trace actions of the GC task threads")                           \
2412                                                                             \
2413   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2414           "Print the time taken by each phase in ParallelOldGC "            \
2415           "(PrintGCDetails must also be enabled)")                          \
2416                                                                             \
2417   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2418           "Trace marking phase in ParallelOldGC")                           \
2419                                                                             \
2420   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2421           "Trace summary phase in ParallelOldGC")                           \
2422                                                                             \
2423   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2424           "Trace compaction phase in ParallelOldGC")                        \
2425                                                                             \
2426   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2427           "Trace dense prefix computation for ParallelOldGC")               \
2428                                                                             \
2429   develop(bool, IgnoreLibthreadGPFault, false,                              \
2430           "Suppress workaround for libthread GP fault")                     \
2431                                                                             \
2432   product(bool, PrintJNIGCStalls, false,                                    \
2433           "Print diagnostic message when GC is stalled "                    \
2434           "by JNI critical section")                                        \
2435                                                                             \
2436   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2437           "The percentage of the used heap that the instances of a class "  \
2438           "must occupy for the class to generate a trace event")            \
2439                                                                             \
2440   /* GC log rotation setting */                                             \
2441                                                                             \
2442   product(bool, UseGCLogFileRotation, false,                                \
2443           "Rotate gclog files (for long running applications). It requires "\
2444           "-Xloggc:<filename>")                                             \
2445                                                                             \
2446   product(uintx, NumberOfGCLogFiles, 0,                                     \
2447           "Number of gclog files in rotation "                              \
2448           "(default: 0, no rotation)")                                      \
2449                                                                             \
2450   product(size_t, GCLogFileSize, 8*K,                                       \
2451           "GC log file size, requires UseGCLogFileRotation. "               \
2452           "Set to 0 to only trigger rotation via jcmd")                     \
2453                                                                             \
2454   /* JVMTI heap profiling */                                                \
2455                                                                             \
2456   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2457           "Trace JVMTI object tagging calls")                               \
2458                                                                             \
2459   diagnostic(bool, VerifyBeforeIteration, false,                            \
2460           "Verify memory system before JVMTI iteration")                    \
2461                                                                             \
2462   /* compiler interface */                                                  \
2463                                                                             \
2464   develop(bool, CIPrintCompilerName, false,                                 \
2465           "when CIPrint is active, print the name of the active compiler")  \
2466                                                                             \
2467   diagnostic(bool, CIPrintCompileQueue, false,                              \
2468           "display the contents of the compile queue whenever a "           \
2469           "compilation is enqueued")                                        \
2470                                                                             \
2471   develop(bool, CIPrintRequests, false,                                     \
2472           "display every request for compilation")                          \
2473                                                                             \
2474   product(bool, CITime, false,                                              \
2475           "collect timing information for compilation")                     \
2476                                                                             \
2477   develop(bool, CITimeVerbose, false,                                       \
2478           "be more verbose in compilation timings")                         \
2479                                                                             \
2480   develop(bool, CITimeEach, false,                                          \
2481           "display timing information after each successful compilation")   \
2482                                                                             \
2483   develop(bool, CICountOSR, false,                                          \
2484           "use a separate counter when assigning ids to osr compilations")  \
2485                                                                             \
2486   develop(bool, CICompileNatives, true,                                     \
2487           "compile native methods if supported by the compiler")            \
2488                                                                             \
2489   develop_pd(bool, CICompileOSR,                                            \
2490           "compile on stack replacement methods if supported by the "       \
2491           "compiler")                                                       \
2492                                                                             \
2493   develop(bool, CIPrintMethodCodes, false,                                  \
2494           "print method bytecodes of the compiled code")                    \
2495                                                                             \
2496   develop(bool, CIPrintTypeFlow, false,                                     \
2497           "print the results of ciTypeFlow analysis")                       \
2498                                                                             \
2499   develop(bool, CITraceTypeFlow, false,                                     \
2500           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2501                                                                             \
2502   develop(intx, OSROnlyBCI, -1,                                             \
2503           "OSR only at this bci.  Negative values mean exclude that bci")   \
2504                                                                             \
2505   /* compiler */                                                            \
2506                                                                             \
2507   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2508           "Number of compiler threads to run")                              \
2509                                                                             \
2510   product(intx, CompilationPolicyChoice, 0,                                 \
2511           "which compilation policy (0-3)")                                 \
2512                                                                             \
2513   develop(bool, UseStackBanging, true,                                      \
2514           "use stack banging for stack overflow checks (required for "      \
2515           "proper StackOverflow handling; disable only to measure cost "    \
2516           "of stackbanging)")                                               \
2517                                                                             \
2518   develop(bool, UseStrictFP, true,                                          \
2519           "use strict fp if modifier strictfp is set")                      \
2520                                                                             \
2521   develop(bool, GenerateSynchronizationCode, true,                          \
2522           "generate locking/unlocking code for synchronized methods and "   \
2523           "monitors")                                                       \
2524                                                                             \
2525   develop(bool, GenerateCompilerNullChecks, true,                           \
2526           "Generate explicit null checks for loads/stores/calls")           \
2527                                                                             \
2528   develop(bool, GenerateRangeChecks, true,                                  \
2529           "Generate range checks for array accesses")                       \
2530                                                                             \
2531   develop_pd(bool, ImplicitNullChecks,                                      \
2532           "Generate code for implicit null checks")                         \
2533                                                                             \
2534   product_pd(bool, TrapBasedNullChecks,                                     \
2535           "Generate code for null checks that uses a cmp and trap "         \
2536           "instruction raising SIGTRAP.  This is only used if an access to" \
2537           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2538           "ImplicitNullChecks don't work (PPC64).")                         \
2539                                                                             \
2540   product(bool, PrintSafepointStatistics, false,                            \
2541           "Print statistics about safepoint synchronization")               \
2542                                                                             \
2543   product(intx, PrintSafepointStatisticsCount, 300,                         \
2544           "Total number of safepoint statistics collected "                 \
2545           "before printing them out")                                       \
2546                                                                             \
2547   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2548           "Print safepoint statistics only when safepoint takes "           \
2549           "more than PrintSafepointSatisticsTimeout in millis")             \
2550                                                                             \
2551   product(bool, TraceSafepointCleanupTime, false,                           \
2552           "Print the break down of clean up tasks performed during "        \
2553           "safepoint")                                                      \
2554                                                                             \
2555   product(bool, Inline, true,                                               \
2556           "Enable inlining")                                                \
2557                                                                             \
2558   product(bool, ClipInlining, true,                                         \
2559           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2560                                                                             \
2561   develop(bool, UseCHA, true,                                               \
2562           "Enable CHA")                                                     \
2563                                                                             \
2564   product(bool, UseTypeProfile, true,                                       \
2565           "Check interpreter profile for historically monomorphic calls")   \
2566                                                                             \
2567   diagnostic(bool, PrintInlining, false,                                    \
2568           "Print inlining optimizations")                                   \
2569                                                                             \
2570   product(bool, UsePopCountInstruction, false,                              \
2571           "Use population count instruction")                               \
2572                                                                             \
2573   develop(bool, EagerInitialization, false,                                 \
2574           "Eagerly initialize classes if possible")                         \
2575                                                                             \
2576   develop(bool, TraceMethodReplacement, false,                              \
2577           "Print when methods are replaced do to recompilation")            \
2578                                                                             \
2579   develop(bool, PrintMethodFlushing, false,                                 \
2580           "Print the nmethods being flushed")                               \
2581                                                                             \
2582   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2583           "print statistics about method flushing")                         \
2584                                                                             \
2585   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2586           "Number of compiled code invocations after which "                \
2587           "the method is considered as hot by the flusher")                 \
2588                                                                             \
2589   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2590           "Minimum number of sweeper passes before an nmethod "             \
2591           "can be flushed")                                                 \
2592                                                                             \
2593   product(bool, UseCodeAging, true,                                         \
2594           "Insert counter to detect warm methods")                          \
2595                                                                             \
2596   diagnostic(bool, StressCodeAging, false,                                  \
2597           "Start with counters compiled in")                                \
2598                                                                             \
2599   develop(bool, UseRelocIndex, false,                                       \
2600           "Use an index to speed random access to relocations")             \
2601                                                                             \
2602   develop(bool, StressCodeBuffers, false,                                   \
2603           "Exercise code buffer expansion and other rare state changes")    \
2604                                                                             \
2605   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2606           "Generate extra debugging information for non-safepoints in "     \
2607           "nmethods")                                                       \
2608                                                                             \
2609   product(bool, PrintVMOptions, false,                                      \
2610           "Print flags that appeared on the command line")                  \
2611                                                                             \
2612   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2613           "Ignore unrecognized VM options")                                 \
2614                                                                             \
2615   product(bool, PrintCommandLineFlags, false,                               \
2616           "Print flags specified on command line or set by ergonomics")     \
2617                                                                             \
2618   product(bool, PrintFlagsInitial, false,                                   \
2619           "Print all VM flags before argument processing and exit VM")      \
2620                                                                             \
2621   product(bool, PrintFlagsFinal, false,                                     \
2622           "Print all VM flags after argument and ergonomic processing")     \
2623                                                                             \
2624   notproduct(bool, PrintFlagsWithComments, false,                           \
2625           "Print all VM flags with default values and descriptions and "    \
2626           "exit")                                                           \
2627                                                                             \
2628   diagnostic(bool, SerializeVMOutput, true,                                 \
2629           "Use a mutex to serialize output to tty and LogFile")             \
2630                                                                             \
2631   diagnostic(bool, DisplayVMOutput, true,                                   \
2632           "Display all VM output on the tty, independently of LogVMOutput") \
2633                                                                             \
2634   diagnostic(bool, LogVMOutput, false,                                      \
2635           "Save VM output to LogFile")                                      \
2636                                                                             \
2637   diagnostic(ccstr, LogFile, NULL,                                          \
2638           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2639           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2640                                                                             \
2641   product(ccstr, ErrorFile, NULL,                                           \
2642           "If an error occurs, save the error data to this file "           \
2643           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2644                                                                             \
2645   product(bool, DisplayVMOutputToStderr, false,                             \
2646           "If DisplayVMOutput is true, display all VM output to stderr")    \
2647                                                                             \
2648   product(bool, DisplayVMOutputToStdout, false,                             \
2649           "If DisplayVMOutput is true, display all VM output to stdout")    \
2650                                                                             \
2651   product(bool, UseHeavyMonitors, false,                                    \
2652           "use heavyweight instead of lightweight Java monitors")           \
2653                                                                             \
2654   product(bool, PrintStringTableStatistics, false,                          \
2655           "print statistics about the StringTable and SymbolTable")         \
2656                                                                             \
2657   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2658           "verify StringTable contents at exit")                            \
2659                                                                             \
2660   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2661           "print histogram of the symbol table")                            \
2662                                                                             \
2663   notproduct(bool, ExitVMOnVerifyError, false,                              \
2664           "standard exit from VM if bytecode verify error "                 \
2665           "(only in debug mode)")                                           \
2666                                                                             \
2667   notproduct(ccstr, AbortVMOnException, NULL,                               \
2668           "Call fatal if this exception is thrown.  Example: "              \
2669           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2670                                                                             \
2671   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2672           "Call fatal if the exception pointed by AbortVMOnException "      \
2673           "has this message")                                               \
2674                                                                             \
2675   develop(bool, DebugVtables, false,                                        \
2676           "add debugging code to vtable dispatch")                          \
2677                                                                             \
2678   develop(bool, PrintVtables, false,                                        \
2679           "print vtables when printing klass")                              \
2680                                                                             \
2681   notproduct(bool, PrintVtableStats, false,                                 \
2682           "print vtables stats at end of run")                              \
2683                                                                             \
2684   develop(bool, TraceCreateZombies, false,                                  \
2685           "trace creation of zombie nmethods")                              \
2686                                                                             \
2687   notproduct(bool, IgnoreLockingAssertions, false,                          \
2688           "disable locking assertions (for speed)")                         \
2689                                                                             \
2690   product(bool, RangeCheckElimination, true,                                \
2691           "Eliminate range checks")                                         \
2692                                                                             \
2693   develop_pd(bool, UncommonNullCast,                                        \
2694           "track occurrences of null in casts; adjust compiler tactics")    \
2695                                                                             \
2696   develop(bool, TypeProfileCasts,  true,                                    \
2697           "treat casts like calls for purposes of type profiling")          \
2698                                                                             \
2699   develop(bool, DelayCompilationDuringStartup, true,                        \
2700           "Delay invoking the compiler until main application class is "    \
2701           "loaded")                                                         \
2702                                                                             \
2703   develop(bool, CompileTheWorld, false,                                     \
2704           "Compile all methods in all classes in bootstrap class path "     \
2705           "(stress test)")                                                  \
2706                                                                             \
2707   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2708           "Preload all classes used by a class before start loading")       \
2709                                                                             \
2710   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2711           "Force a safepoint every n compiles so sweeper can keep up")      \
2712                                                                             \
2713   develop(bool, FillDelaySlots, true,                                       \
2714           "Fill delay slots (on SPARC only)")                               \
2715                                                                             \
2716   develop(bool, TimeLivenessAnalysis, false,                                \
2717           "Time computation of bytecode liveness analysis")                 \
2718                                                                             \
2719   develop(bool, TraceLivenessGen, false,                                    \
2720           "Trace the generation of liveness analysis information")          \
2721                                                                             \
2722   notproduct(bool, TraceLivenessQuery, false,                               \
2723           "Trace queries of liveness analysis information")                 \
2724                                                                             \
2725   notproduct(bool, CollectIndexSetStatistics, false,                        \
2726           "Collect information about IndexSets")                            \
2727                                                                             \
2728   develop(bool, UseLoopSafepoints, true,                                    \
2729           "Generate Safepoint nodes in every loop")                         \
2730                                                                             \
2731   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2732           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2733           "Inline allocations larger than this in doublewords must go slow")\
2734                                                                             \
2735   product(bool, AggressiveOpts, false,                                      \
2736           "Enable aggressive optimizations - see arguments.cpp")            \
2737                                                                             \
2738   product_pd(uintx, TypeProfileLevel,                                       \
2739           "=XYZ, with Z: Type profiling of arguments at call; "             \
2740                      "Y: Type profiling of return value at call; "          \
2741                      "X: Type profiling of parameters to methods; "         \
2742           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2743                                                                             \
2744   product(intx, TypeProfileArgsLimit,     2,                                \
2745           "max number of call arguments to consider for type profiling")    \
2746                                                                             \
2747   product(intx, TypeProfileParmsLimit,    2,                                \
2748           "max number of incoming parameters to consider for type profiling"\
2749           ", -1 for all")                                                   \
2750                                                                             \
2751   /* statistics */                                                          \
2752   develop(bool, CountCompiledCalls, false,                                  \
2753           "Count method invocations")                                       \
2754                                                                             \
2755   notproduct(bool, CountRuntimeCalls, false,                                \
2756           "Count VM runtime calls")                                         \
2757                                                                             \
2758   develop(bool, CountJNICalls, false,                                       \
2759           "Count jni method invocations")                                   \
2760                                                                             \
2761   notproduct(bool, CountJVMCalls, false,                                    \
2762           "Count jvm method invocations")                                   \
2763                                                                             \
2764   notproduct(bool, CountRemovableExceptions, false,                         \
2765           "Count exceptions that could be replaced by branches due to "     \
2766           "inlining")                                                       \
2767                                                                             \
2768   notproduct(bool, ICMissHistogram, false,                                  \
2769           "Produce histogram of IC misses")                                 \
2770                                                                             \
2771   notproduct(bool, PrintClassStatistics, false,                             \
2772           "Print class statistics at end of run")                           \
2773                                                                             \
2774   notproduct(bool, PrintMethodStatistics, false,                            \
2775           "Print method statistics at end of run")                          \
2776                                                                             \
2777   /* interpreter */                                                         \
2778   develop(bool, ClearInterpreterLocals, false,                              \
2779           "Always clear local variables of interpreter activations upon "   \
2780           "entry")                                                          \
2781                                                                             \
2782   product_pd(bool, RewriteBytecodes,                                        \
2783           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2784                                                                             \
2785   product_pd(bool, RewriteFrequentPairs,                                    \
2786           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2787                                                                             \
2788   diagnostic(bool, PrintInterpreter, false,                                 \
2789           "Print the generated interpreter code")                           \
2790                                                                             \
2791   product(bool, UseInterpreter, true,                                       \
2792           "Use interpreter for non-compiled methods")                       \
2793                                                                             \
2794   develop(bool, UseFastSignatureHandlers, true,                             \
2795           "Use fast signature handlers for native calls")                   \
2796                                                                             \
2797   product(bool, UseLoopCounter, true,                                       \
2798           "Increment invocation counter on backward branch")                \
2799                                                                             \
2800   product_pd(bool, UseOnStackReplacement,                                   \
2801           "Use on stack replacement, calls runtime if invoc. counter "      \
2802           "overflows in loop")                                              \
2803                                                                             \
2804   notproduct(bool, TraceOnStackReplacement, false,                          \
2805           "Trace on stack replacement")                                     \
2806                                                                             \
2807   product_pd(bool, PreferInterpreterNativeStubs,                            \
2808           "Use always interpreter stubs for native methods invoked via "    \
2809           "interpreter")                                                    \
2810                                                                             \
2811   develop(bool, CountBytecodes, false,                                      \
2812           "Count number of bytecodes executed")                             \
2813                                                                             \
2814   develop(bool, PrintBytecodeHistogram, false,                              \
2815           "Print histogram of the executed bytecodes")                      \
2816                                                                             \
2817   develop(bool, PrintBytecodePairHistogram, false,                          \
2818           "Print histogram of the executed bytecode pairs")                 \
2819                                                                             \
2820   diagnostic(bool, PrintSignatureHandlers, false,                           \
2821           "Print code generated for native method signature handlers")      \
2822                                                                             \
2823   develop(bool, VerifyOops, false,                                          \
2824           "Do plausibility checks for oops")                                \
2825                                                                             \
2826   develop(bool, CheckUnhandledOops, false,                                  \
2827           "Check for unhandled oops in VM code")                            \
2828                                                                             \
2829   develop(bool, VerifyJNIFields, trueInDebug,                               \
2830           "Verify jfieldIDs for instance fields")                           \
2831                                                                             \
2832   notproduct(bool, VerifyJNIEnvThread, false,                               \
2833           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2834           "from JNI")                                                       \
2835                                                                             \
2836   develop(bool, VerifyFPU, false,                                           \
2837           "Verify FPU state (check for NaN's, etc.)")                       \
2838                                                                             \
2839   develop(bool, VerifyThread, false,                                        \
2840           "Watch the thread register for corruption (SPARC only)")          \
2841                                                                             \
2842   develop(bool, VerifyActivationFrameSize, false,                           \
2843           "Verify that activation frame didn't become smaller than its "    \
2844           "minimal size")                                                   \
2845                                                                             \
2846   develop(bool, TraceFrequencyInlining, false,                              \
2847           "Trace frequency based inlining")                                 \
2848                                                                             \
2849   develop_pd(bool, InlineIntrinsics,                                        \
2850           "Inline intrinsics that can be statically resolved")              \
2851                                                                             \
2852   product_pd(bool, ProfileInterpreter,                                      \
2853           "Profile at the bytecode level during interpretation")            \
2854                                                                             \
2855   develop(bool, TraceProfileInterpreter, false,                             \
2856           "Trace profiling at the bytecode level during interpretation. "   \
2857           "This outputs the profiling information collected to improve "    \
2858           "jit compilation.")                                               \
2859                                                                             \
2860   develop_pd(bool, ProfileTraps,                                            \
2861           "Profile deoptimization traps at the bytecode level")             \
2862                                                                             \
2863   product(intx, ProfileMaturityPercentage, 20,                              \
2864           "number of method invocations/branches (expressed as % of "       \
2865           "CompileThreshold) before using the method's profile")            \
2866                                                                             \
2867   diagnostic(bool, PrintMethodData, false,                                  \
2868           "Print the results of +ProfileInterpreter at end of run")         \
2869                                                                             \
2870   develop(bool, VerifyDataPointer, trueInDebug,                             \
2871           "Verify the method data pointer during interpreter profiling")    \
2872                                                                             \
2873   develop(bool, VerifyCompiledCode, false,                                  \
2874           "Include miscellaneous runtime verifications in nmethod code; "   \
2875           "default off because it disturbs nmethod size heuristics")        \
2876                                                                             \
2877   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2878           "Manually make GC thread crash then dump java stack trace;  "     \
2879           "Test only")                                                      \
2880                                                                             \
2881   /* compilation */                                                         \
2882   product(bool, UseCompiler, true,                                          \
2883           "Use Just-In-Time compilation")                                   \
2884                                                                             \
2885   develop(bool, TraceCompilationPolicy, false,                              \
2886           "Trace compilation policy")                                       \
2887                                                                             \
2888   develop(bool, TimeCompilationPolicy, false,                               \
2889           "Time the compilation policy")                                    \
2890                                                                             \
2891   product(bool, UseCounterDecay, true,                                      \
2892           "Adjust recompilation counters")                                  \
2893                                                                             \
2894   develop(intx, CounterHalfLifeTime,    30,                                 \
2895           "Half-life time of invocation counters (in seconds)")             \
2896                                                                             \
2897   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2898           "The minimum interval (in milliseconds) between invocation of "   \
2899           "CounterDecay")                                                   \
2900                                                                             \
2901   product(bool, AlwaysCompileLoopMethods, false,                            \
2902           "When using recompilation, never interpret methods "              \
2903           "containing loops")                                               \
2904                                                                             \
2905   product(bool, DontCompileHugeMethods, true,                               \
2906           "Do not compile methods > HugeMethodLimit")                       \
2907                                                                             \
2908   /* Bytecode escape analysis estimation. */                                \
2909   product(bool, EstimateArgEscape, true,                                    \
2910           "Analyze bytecodes to estimate escape state of arguments")        \
2911                                                                             \
2912   product(intx, BCEATraceLevel, 0,                                          \
2913           "How much tracing to do of bytecode escape analysis estimates")   \
2914                                                                             \
2915   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2916           "Maximum number of nested calls that are analyzed by BC EA")      \
2917                                                                             \
2918   product(intx, MaxBCEAEstimateSize, 150,                                   \
2919           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2920                                                                             \
2921   product(intx,  AllocatePrefetchStyle, 1,                                  \
2922           "0 = no prefetch, "                                               \
2923           "1 = prefetch instructions for each allocation, "                 \
2924           "2 = use TLAB watermark to gate allocation prefetch, "            \
2925           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2926                                                                             \
2927   product(intx,  AllocatePrefetchDistance, -1,                              \
2928           "Distance to prefetch ahead of allocation pointer")               \
2929                                                                             \
2930   product(intx,  AllocatePrefetchLines, 3,                                  \
2931           "Number of lines to prefetch ahead of array allocation pointer")  \
2932                                                                             \
2933   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2934           "Number of lines to prefetch ahead of instance allocation "       \
2935           "pointer")                                                        \
2936                                                                             \
2937   product(intx,  AllocatePrefetchStepSize, 16,                              \
2938           "Step size in bytes of sequential prefetch instructions")         \
2939                                                                             \
2940   product(intx,  AllocatePrefetchInstr, 0,                                  \
2941           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2942                                                                             \
2943   /* deoptimization */                                                      \
2944   develop(bool, TraceDeoptimization, false,                                 \
2945           "Trace deoptimization")                                           \
2946                                                                             \
2947   develop(bool, DebugDeoptimization, false,                                 \
2948           "Tracing various information while debugging deoptimization")     \
2949                                                                             \
2950   product(intx, SelfDestructTimer, 0,                                       \
2951           "Will cause VM to terminate after a given time (in minutes) "     \
2952           "(0 means off)")                                                  \
2953                                                                             \
2954   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2955           "The maximum number of lines in the stack trace for Java "        \
2956           "exceptions (0 means all)")                                       \
2957                                                                             \
2958   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2959           "Guarantee a safepoint (at least) every so many milliseconds "    \
2960           "(0 means none)"))                                                \
2961                                                                             \
2962   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2963           "Guarantee a safepoint (at least) every so many milliseconds "    \
2964           "(0 means none)"))                                                \
2965                                                                             \
2966   product(intx, SafepointTimeoutDelay, 10000,                               \
2967           "Delay in milliseconds for option SafepointTimeout")              \
2968                                                                             \
2969   product(intx, NmethodSweepActivity, 10,                                   \
2970           "Removes cold nmethods from code cache if > 0. Higher values "    \
2971           "result in more aggressive sweeping")                             \
2972                                                                             \
2973   notproduct(bool, LogSweeper, false,                                       \
2974           "Keep a ring buffer of sweeper activity")                         \
2975                                                                             \
2976   notproduct(intx, SweeperLogEntries, 1024,                                 \
2977           "Number of records in the ring buffer of sweeper activity")       \
2978                                                                             \
2979   notproduct(intx, MemProfilingInterval, 500,                               \
2980           "Time between each invocation of the MemProfiler")                \
2981                                                                             \
2982   develop(intx, MallocCatchPtr, -1,                                         \
2983           "Hit breakpoint when mallocing/freeing this pointer")             \
2984                                                                             \
2985   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2986           "List of assertions (file:line) to muzzle")                       \
2987                                                                             \
2988   notproduct(size_t, HandleAllocationLimit, 1024,                           \
2989           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2990           "is used")                                                        \
2991                                                                             \
2992   develop(size_t, TotalHandleAllocationLimit, 1024,                         \
2993           "Threshold for total handle allocation when "                     \
2994           "+TraceHandleAllocation is used")                                 \
2995                                                                             \
2996   develop(intx, StackPrintLimit, 100,                                       \
2997           "number of stack frames to print in VM-level stack dump")         \
2998                                                                             \
2999   notproduct(intx, MaxElementPrintSize, 256,                                \
3000           "maximum number of elements to print")                            \
3001                                                                             \
3002   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3003           "maximum number of subklasses to print when printing klass")      \
3004                                                                             \
3005   product(intx, MaxInlineLevel, 9,                                          \
3006           "maximum number of nested calls that are inlined")                \
3007                                                                             \
3008   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3009           "maximum number of nested recursive calls that are inlined")      \
3010                                                                             \
3011   develop(intx, MaxForceInlineLevel, 100,                                   \
3012           "maximum number of nested calls that are forced for inlining "    \
3013           "(using CompilerOracle or marked w/ @ForceInline)")               \
3014                                                                             \
3015   product_pd(intx, InlineSmallCode,                                         \
3016           "Only inline already compiled methods if their code size is "     \
3017           "less than this")                                                 \
3018                                                                             \
3019   product(intx, MaxInlineSize, 35,                                          \
3020           "The maximum bytecode size of a method to be inlined")            \
3021                                                                             \
3022   product_pd(intx, FreqInlineSize,                                          \
3023           "The maximum bytecode size of a frequent method to be inlined")   \
3024                                                                             \
3025   product(intx, MaxTrivialSize, 6,                                          \
3026           "The maximum bytecode size of a trivial method to be inlined")    \
3027                                                                             \
3028   product(intx, MinInliningThreshold, 250,                                  \
3029           "The minimum invocation count a method needs to have to be "      \
3030           "inlined")                                                        \
3031                                                                             \
3032   develop(intx, MethodHistogramCutoff, 100,                                 \
3033           "The cutoff value for method invocation histogram (+CountCalls)") \
3034                                                                             \
3035   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3036           "Number of interpreted methods to show in profile")               \
3037                                                                             \
3038   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3039           "Number of compiled methods to show in profile")                  \
3040                                                                             \
3041   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3042           "Number of stub methods to show in profile")                      \
3043                                                                             \
3044   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3045           "Number of runtime stub nodes to show in profile")                \
3046                                                                             \
3047   product(intx, ProfileIntervalsTicks, 100,                                 \
3048           "Number of ticks between printing of interval profile "           \
3049           "(+ProfileIntervals)")                                            \
3050                                                                             \
3051   notproduct(intx, ScavengeALotInterval,     1,                             \
3052           "Interval between which scavenge will occur with +ScavengeALot")  \
3053                                                                             \
3054   notproduct(intx, FullGCALotInterval,     1,                               \
3055           "Interval between which full gc will occur with +FullGCALot")     \
3056                                                                             \
3057   notproduct(intx, FullGCALotStart,     0,                                  \
3058           "For which invocation to start FullGCAlot")                       \
3059                                                                             \
3060   notproduct(intx, FullGCALotDummies,  32*K,                                \
3061           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3062           "to move")                                                        \
3063                                                                             \
3064   develop(intx, DontYieldALotInterval,    10,                               \
3065           "Interval between which yields will be dropped (milliseconds)")   \
3066                                                                             \
3067   develop(intx, MinSleepInterval,     1,                                    \
3068           "Minimum sleep() interval (milliseconds) when "                   \
3069           "ConvertSleepToYield is off (used for Solaris)")                  \
3070                                                                             \
3071   develop(intx, ProfilerPCTickThreshold,    15,                             \
3072           "Number of ticks in a PC buckets to be a hotspot")                \
3073                                                                             \
3074   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3075           "Number of exits until DeoptimizeALot kicks in")                  \
3076                                                                             \
3077   notproduct(intx, ZombieALotInterval,     5,                               \
3078           "Number of exits until ZombieALot kicks in")                      \
3079                                                                             \
3080   diagnostic(intx, MallocVerifyInterval,     0,                             \
3081           "If non-zero, verify C heap after every N calls to "              \
3082           "malloc/realloc/free")                                            \
3083                                                                             \
3084   diagnostic(intx, MallocVerifyStart,     0,                                \
3085           "If non-zero, start verifying C heap after Nth call to "          \
3086           "malloc/realloc/free")                                            \
3087                                                                             \
3088   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3089           "If non-zero, maximum number of words that malloc/realloc can "   \
3090           "allocate (for testing only)")                                    \
3091                                                                             \
3092   product(intx, TypeProfileWidth,     2,                                    \
3093           "Number of receiver types to record in call/cast profile")        \
3094                                                                             \
3095   develop(intx, BciProfileWidth,      2,                                    \
3096           "Number of return bci's to record in ret profile")                \
3097                                                                             \
3098   product(intx, PerMethodRecompilationCutoff, 400,                          \
3099           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3100                                                                             \
3101   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3102           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3103                                                                             \
3104   product(intx, PerMethodTrapLimit,  100,                                   \
3105           "Limit on traps (of one kind) in a method (includes inlines)")    \
3106                                                                             \
3107   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3108           "Limit on speculative traps (of one kind) in a method (includes inlines)") \
3109                                                                             \
3110   product(intx, PerBytecodeTrapLimit,  4,                                   \
3111           "Limit on traps (of one kind) at a particular BCI")               \
3112                                                                             \
3113   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3114           "Extra method data trap entries for speculation")                 \
3115                                                                             \
3116   develop(intx, InlineFrequencyRatio,    20,                                \
3117           "Ratio of call site execution to caller method invocation")       \
3118                                                                             \
3119   develop_pd(intx, InlineFrequencyCount,                                    \
3120           "Count of call site execution necessary to trigger frequent "     \
3121           "inlining")                                                       \
3122                                                                             \
3123   develop(intx, InlineThrowCount,    50,                                    \
3124           "Force inlining of interpreted methods that throw this often")    \
3125                                                                             \
3126   develop(intx, InlineThrowMaxSize,   200,                                  \
3127           "Force inlining of throwing methods smaller than this")           \
3128                                                                             \
3129   develop(intx, ProfilerNodeSize,  1024,                                    \
3130           "Size in K to allocate for the Profile Nodes of each thread")     \
3131                                                                             \
3132   product_pd(intx, PreInflateSpin,                                          \
3133           "Number of times to spin wait before inflation")                  \
3134                                                                             \
3135   /* gc parameters */                                                       \
3136   product(size_t, InitialHeapSize, 0,                                       \
3137           "Initial heap size (in bytes); zero means use ergonomics")        \
3138                                                                             \
3139   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3140           "Maximum heap size (in bytes)")                                   \
3141                                                                             \
3142   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3143           "Initial tenured generation size (in bytes)")                     \
3144                                                                             \
3145   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3146           "Initial new generation size (in bytes)")                         \
3147                                                                             \
3148   product(size_t, MaxNewSize, max_uintx,                                    \
3149           "Maximum new generation size (in bytes), max_uintx means set "    \
3150           "ergonomically")                                                  \
3151                                                                             \
3152   product(size_t, PretenureSizeThreshold, 0,                                \
3153           "Maximum size in bytes of objects allocated in DefNew "           \
3154           "generation; zero means no maximum")                              \
3155                                                                             \
3156   product(size_t, TLABSize, 0,                                              \
3157           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3158                                                                             \
3159   product(size_t, MinTLABSize, 2*K,                                         \
3160           "Minimum allowed TLAB size (in bytes)")                           \
3161                                                                             \
3162   product(uintx, TLABAllocationWeight, 35,                                  \
3163           "Allocation averaging weight")                                    \
3164                                                                             \
3165   product(uintx, TLABWasteTargetPercent, 1,                                 \
3166           "Percentage of Eden that can be wasted")                          \
3167                                                                             \
3168   product(uintx, TLABRefillWasteFraction,    64,                            \
3169           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3170                                                                             \
3171   product(uintx, TLABWasteIncrement,    4,                                  \
3172           "Increment allowed waste at slow allocation")                     \
3173                                                                             \
3174   product(uintx, SurvivorRatio, 8,                                          \
3175           "Ratio of eden/survivor space size")                              \
3176                                                                             \
3177   product(uintx, NewRatio, 2,                                               \
3178           "Ratio of old/new generation sizes")                              \
3179                                                                             \
3180   product_pd(size_t, NewSizeThreadIncrease,                                 \
3181           "Additional size added to desired new generation size per "       \
3182           "non-daemon thread (in bytes)")                                   \
3183                                                                             \
3184   product_pd(size_t, MetaspaceSize,                                         \
3185           "Initial size of Metaspaces (in bytes)")                          \
3186                                                                             \
3187   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3188           "Maximum size of Metaspaces (in bytes)")                          \
3189                                                                             \
3190   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3191           "Maximum size of class area in Metaspace when compressed "        \
3192           "class pointers are used")                                        \
3193                                                                             \
3194   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3195           "The minimum percentage of heap free after GC to avoid expansion."\
3196           " For most GCs this applies to the old generation. In G1 and"     \
3197           " ParallelGC it applies to the whole heap.")                      \
3198                                                                             \
3199   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3200           "The maximum percentage of heap free after GC to avoid shrinking."\
3201           " For most GCs this applies to the old generation. In G1 and"     \
3202           " ParallelGC it applies to the whole heap.")                      \
3203                                                                             \
3204   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3205           "Number of milliseconds per MB of free space in the heap")        \
3206                                                                             \
3207   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3208           "The minimum change in heap space due to GC (in bytes)")          \
3209                                                                             \
3210   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3211           "The minimum expansion of Metaspace (in bytes)")                  \
3212                                                                             \
3213   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3214           "The minimum percentage of Metaspace free after GC to avoid "     \
3215           "expansion")                                                      \
3216                                                                             \
3217   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3218           "The maximum percentage of Metaspace free after GC to avoid "     \
3219           "shrinking")                                                      \
3220                                                                             \
3221   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3222           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3223                                                                             \
3224   product(uintx, QueuedAllocationWarningCount, 0,                           \
3225           "Number of times an allocation that queues behind a GC "          \
3226           "will retry before printing a warning")                           \
3227                                                                             \
3228   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3229           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3230                                                                             \
3231   diagnostic(intx, VerifyGCLevel,     0,                                    \
3232           "Generation level at which to start +VerifyBefore/AfterGC")       \
3233                                                                             \
3234   product(uintx, MaxTenuringThreshold,    15,                               \
3235           "Maximum value for tenuring threshold")                           \
3236                                                                             \
3237   product(uintx, InitialTenuringThreshold,    7,                            \
3238           "Initial value for tenuring threshold")                           \
3239                                                                             \
3240   product(uintx, TargetSurvivorRatio,    50,                                \
3241           "Desired percentage of survivor space used after scavenge")       \
3242                                                                             \
3243   product(uintx, MarkSweepDeadRatio,     5,                                 \
3244           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3245           "Serial mark sweep treats this as both the minimum and maximum "  \
3246           "value. "                                                         \
3247           "CMS uses this value only if it falls back to mark sweep. "       \
3248           "Par compact uses a variable scale based on the density of the "  \
3249           "generation and treats this as the maximum value when the heap "  \
3250           "is either completely full or completely empty.  Par compact "    \
3251           "also has a smaller default value; see arguments.cpp.")           \
3252                                                                             \
3253   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3254           "How often should we fully compact the heap (ignoring the dead "  \
3255           "space parameters)")                                              \
3256                                                                             \
3257   product(intx, PrintCMSStatistics, 0,                                      \
3258           "Statistics for CMS")                                             \
3259                                                                             \
3260   product(bool, PrintCMSInitiationStatistics, false,                        \
3261           "Statistics for initiating a CMS collection")                     \
3262                                                                             \
3263   product(intx, PrintFLSStatistics, 0,                                      \
3264           "Statistics for CMS' FreeListSpace")                              \
3265                                                                             \
3266   product(intx, PrintFLSCensus, 0,                                          \
3267           "Census for CMS' FreeListSpace")                                  \
3268                                                                             \
3269   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3270           "Delay between expansion and allocation (in milliseconds)")       \
3271                                                                             \
3272   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3273           "Delay in scheduling GC workers (in milliseconds)")               \
3274                                                                             \
3275   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3276           "(Unstable) Number of times to iterate in safepoint loop "        \
3277           "before blocking VM threads ")                                    \
3278                                                                             \
3279   product(intx, DeferPollingPageLoopCount,     -1,                          \
3280           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3281           "before changing safepoint polling page to RO ")                  \
3282                                                                             \
3283   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3284                                                                             \
3285   product(bool, PSChunkLargeArrays, true,                                   \
3286           "Process large arrays in chunks")                                 \
3287                                                                             \
3288   product(uintx, GCDrainStackTargetSize, 64,                                \
3289           "Number of entries we will try to leave on the stack "            \
3290           "during parallel gc")                                             \
3291                                                                             \
3292   /* stack parameters */                                                    \
3293   product_pd(intx, StackYellowPages,                                        \
3294           "Number of yellow zone (recoverable overflows) pages")            \
3295                                                                             \
3296   product_pd(intx, StackRedPages,                                           \
3297           "Number of red zone (unrecoverable overflows) pages")             \
3298                                                                             \
3299   product_pd(intx, StackShadowPages,                                        \
3300           "Number of shadow zone (for overflow checking) pages "            \
3301           "this should exceed the depth of the VM and native call stack")   \
3302                                                                             \
3303   product_pd(intx, ThreadStackSize,                                         \
3304           "Thread Stack Size (in Kbytes)")                                  \
3305                                                                             \
3306   product_pd(intx, VMThreadStackSize,                                       \
3307           "Non-Java Thread Stack Size (in Kbytes)")                         \
3308                                                                             \
3309   product_pd(intx, CompilerThreadStackSize,                                 \
3310           "Compiler Thread Stack Size (in Kbytes)")                         \
3311                                                                             \
3312   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3313           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3314                                                                             \
3315   product(size_t, ThreadSafetyMargin, 50*M,                                 \
3316           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3317           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3318           "disable this feature")                                           \
3319                                                                             \
3320   /* code cache parameters */                                               \
3321   /* ppc64/tiered compilation has large code-entry alignment. */            \
3322   develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3323           "Code cache segment size (in bytes) - smallest unit of "          \
3324           "allocation")                                                     \
3325                                                                             \
3326   develop_pd(intx, CodeEntryAlignment,                                      \
3327           "Code entry alignment for generated code (in bytes)")             \
3328                                                                             \
3329   product_pd(intx, OptoLoopAlignment,                                       \
3330           "Align inner loops to zero relative to this modulus")             \
3331                                                                             \
3332   product_pd(uintx, InitialCodeCacheSize,                                   \
3333           "Initial code cache size (in bytes)")                             \
3334                                                                             \
3335   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3336           "Minimum code cache size (in bytes) required to start VM.")       \
3337                                                                             \
3338   product(bool, SegmentedCodeCache, false,                                  \
3339           "Use a segmented code cache")                                     \
3340                                                                             \
3341   product_pd(uintx, ReservedCodeCacheSize,                                  \
3342           "Reserved code cache size (in bytes) - maximum code cache size")  \
3343                                                                             \
3344   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3345           "Size of code heap with non-profiled methods (in bytes)")         \
3346                                                                             \
3347   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3348           "Size of code heap with profiled methods (in bytes)")             \
3349                                                                             \
3350   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3351           "Size of code heap with non-nmethods (in bytes)")                 \
3352                                                                             \
3353   product_pd(uintx, CodeCacheExpansionSize,                                 \
3354           "Code cache expansion size (in bytes)")                           \
3355                                                                             \
3356   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3357           "Minimum number of segments in a code cache block")               \
3358                                                                             \
3359   notproduct(bool, ExitOnFullCodeCache, false,                              \
3360           "Exit the VM if we fill the code cache")                          \
3361                                                                             \
3362   product(bool, UseCodeCacheFlushing, true,                                 \
3363           "Remove cold/old nmethods from the code cache")                   \
3364                                                                             \
3365   product(uintx, StartAggressiveSweepingAt, 10,                             \
3366           "Start aggressive sweeping if X[%] of the code cache is free."    \
3367           "Segmented code cache: X[%] of the non-profiled heap."            \
3368           "Non-segmented code cache: X[%] of the total code cache")         \
3369                                                                             \
3370   /* interpreter debugging */                                               \
3371   develop(intx, BinarySwitchThreshold, 5,                                   \
3372           "Minimal number of lookupswitch entries for rewriting to binary " \
3373           "switch")                                                         \
3374                                                                             \
3375   develop(intx, StopInterpreterAt, 0,                                       \
3376           "Stop interpreter execution at specified bytecode number")        \
3377                                                                             \
3378   develop(intx, TraceBytecodesAt, 0,                                        \
3379           "Trace bytecodes starting with specified bytecode number")        \
3380                                                                             \
3381   /* compiler interface */                                                  \
3382   develop(intx, CIStart, 0,                                                 \
3383           "The id of the first compilation to permit")                      \
3384                                                                             \
3385   develop(intx, CIStop, max_jint,                                           \
3386           "The id of the last compilation to permit")                       \
3387                                                                             \
3388   develop(intx, CIStartOSR, 0,                                              \
3389           "The id of the first osr compilation to permit "                  \
3390           "(CICountOSR must be on)")                                        \
3391                                                                             \
3392   develop(intx, CIStopOSR, max_jint,                                        \
3393           "The id of the last osr compilation to permit "                   \
3394           "(CICountOSR must be on)")                                        \
3395                                                                             \
3396   develop(intx, CIBreakAtOSR, -1,                                           \
3397           "The id of osr compilation to break at")                          \
3398                                                                             \
3399   develop(intx, CIBreakAt, -1,                                              \
3400           "The id of compilation to break at")                              \
3401                                                                             \
3402   product(ccstrlist, CompileOnly, "",                                       \
3403           "List of methods (pkg/class.name) to restrict compilation to")    \
3404                                                                             \
3405   product(ccstr, CompileCommandFile, NULL,                                  \
3406           "Read compiler commands from this file [.hotspot_compiler]")      \
3407                                                                             \
3408   product(ccstrlist, CompileCommand, "",                                    \
3409           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3410                                                                             \
3411   develop(bool, ReplayCompiles, false,                                      \
3412           "Enable replay of compilations from ReplayDataFile")              \
3413                                                                             \
3414   product(ccstr, ReplayDataFile, NULL,                                      \
3415           "File containing compilation replay information"                  \
3416           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3417                                                                             \
3418    product(ccstr, InlineDataFile, NULL,                                     \
3419           "File containing inlining replay information"                     \
3420           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3421                                                                             \
3422   develop(intx, ReplaySuppressInitializers, 2,                              \
3423           "Control handling of class initialization during replay: "        \
3424           "0 - don't do anything special; "                                 \
3425           "1 - treat all class initializers as empty; "                     \
3426           "2 - treat class initializers for application classes as empty; " \
3427           "3 - allow all class initializers to run during bootstrap but "   \
3428           "    pretend they are empty after starting replay")               \
3429                                                                             \
3430   develop(bool, ReplayIgnoreInitErrors, false,                              \
3431           "Ignore exceptions thrown during initialization for replay")      \
3432                                                                             \
3433   product(bool, DumpReplayDataOnError, true,                                \
3434           "Record replay data for crashing compiler threads")               \
3435                                                                             \
3436   product(bool, CICompilerCountPerCPU, false,                               \
3437           "1 compiler thread for log(N CPUs)")                              \
3438                                                                             \
3439   develop(intx, CIFireOOMAt,    -1,                                         \
3440           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3441           "(non-negative value throws OOM after this many CI accesses "     \
3442           "in each compile)")                                               \
3443   notproduct(intx, CICrashAt, -1,                                           \
3444           "id of compilation to trigger assert in compiler thread for "     \
3445           "the purpose of testing, e.g. generation of replay data")         \
3446   notproduct(bool, CIObjectFactoryVerify, false,                            \
3447           "enable potentially expensive verification in ciObjectFactory")   \
3448                                                                             \
3449   /* Priorities */                                                          \
3450   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3451                                                                             \
3452   product(intx, ThreadPriorityPolicy, 0,                                    \
3453           "0 : Normal.                                                     "\
3454           "    VM chooses priorities that are appropriate for normal       "\
3455           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3456           "    to normal native priority. Java priorities below "           \
3457           "    NORM_PRIORITY map to lower native priority values. On       "\
3458           "    Windows applications are allowed to use higher native       "\
3459           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3460           "    not use the highest possible native priority,               "\
3461           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3462           "    system threads. On Linux thread priorities are ignored      "\
3463           "    because the OS does not support static priority in          "\
3464           "    SCHED_OTHER scheduling class which is the only choice for   "\
3465           "    non-root, non-realtime applications.                        "\
3466           "1 : Aggressive.                                                 "\
3467           "    Java thread priorities map over to the entire range of      "\
3468           "    native thread priorities. Higher Java thread priorities map "\
3469           "    to higher native thread priorities. This policy should be   "\
3470           "    used with care, as sometimes it can cause performance       "\
3471           "    degradation in the application and/or the entire system. On "\
3472           "    Linux this policy requires root privilege.")                 \
3473                                                                             \
3474   product(bool, ThreadPriorityVerbose, false,                               \
3475           "Print priority changes")                                         \
3476                                                                             \
3477   product(intx, CompilerThreadPriority, -1,                                 \
3478           "The native priority at which compiler threads should run "       \
3479           "(-1 means no change)")                                           \
3480                                                                             \
3481   product(intx, VMThreadPriority, -1,                                       \
3482           "The native priority at which the VM thread should run "          \
3483           "(-1 means no change)")                                           \
3484                                                                             \
3485   product(bool, CompilerThreadHintNoPreempt, true,                          \
3486           "(Solaris only) Give compiler threads an extra quanta")           \
3487                                                                             \
3488   product(bool, VMThreadHintNoPreempt, false,                               \
3489           "(Solaris only) Give VM thread an extra quanta")                  \
3490                                                                             \
3491   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3492           "Map Java priorities to OS priorities")                           \
3493                                                                             \
3494   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3495           "Map Java priorities to OS priorities")                           \
3496                                                                             \
3497   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3498           "Map Java priorities to OS priorities")                           \
3499                                                                             \
3500   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3501           "Map Java priorities to OS priorities")                           \
3502                                                                             \
3503   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3504           "Map Java priorities to OS priorities")                           \
3505                                                                             \
3506   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3507           "Map Java priorities to OS priorities")                           \
3508                                                                             \
3509   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3510           "Map Java priorities to OS priorities")                           \
3511                                                                             \
3512   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3513           "Map Java priorities to OS priorities")                           \
3514                                                                             \
3515   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3516           "Map Java priorities to OS priorities")                           \
3517                                                                             \
3518   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3519           "Map Java priorities to OS priorities")                           \
3520                                                                             \
3521   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3522           "Java thread priority 10 maps to critical scheduling priority")   \
3523                                                                             \
3524   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3525           "Compiler thread(s) run at critical scheduling priority")         \
3526                                                                             \
3527   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3528           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3529                                                                             \
3530   /* compiler debugging */                                                  \
3531   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3532           "First class to consider when using +CompileTheWorld")            \
3533                                                                             \
3534   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3535           "Last class to consider when using +CompileTheWorld")             \
3536                                                                             \
3537   develop(intx, NewCodeParameter,      0,                                   \
3538           "Testing Only: Create a dedicated integer parameter before "      \
3539           "putback")                                                        \
3540                                                                             \
3541   /* new oopmap storage allocation */                                       \
3542   develop(intx, MinOopMapAllocation,     8,                                 \
3543           "Minimum number of OopMap entries in an OopMapSet")               \
3544                                                                             \
3545   /* Background Compilation */                                              \
3546   develop(intx, LongCompileThreshold,     50,                               \
3547           "Used with +TraceLongCompiles")                                   \
3548                                                                             \
3549   product(intx, StarvationMonitorInterval,    200,                          \
3550           "Pause between each check (in milliseconds)")                     \
3551                                                                             \
3552   /* recompilation */                                                       \
3553   product_pd(intx, CompileThreshold,                                        \
3554           "number of interpreted method invocations before (re-)compiling") \
3555                                                                             \
3556   product(double, CompileThresholdScaling, 1.0,                             \
3557           "Factor to control when first compilation happens "               \
3558           "(both with and without tiered compilation): "                    \
3559           "values greater than 1.0 delay counter overflow, "                \
3560           "values between 0 and 1.0 rush counter overflow, "                \
3561           "value of 1.0 leaves compilation thresholds unchanged "           \
3562           "value of 0.0 is equivalent to -Xint. "                           \
3563           ""                                                                \
3564           "Flag can be set as per-method option. "                          \
3565           "If a value is specified for a method, compilation thresholds "   \
3566           "for that method are scaled by both the value of the global flag "\
3567           "and the value of the per-method flag.")                          \
3568                                                                             \
3569   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3570           "Interpreter (tier 0) invocation notification frequency")         \
3571                                                                             \
3572   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3573           "C1 without MDO (tier 2) invocation notification frequency")      \
3574                                                                             \
3575   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3576           "C1 with MDO profiling (tier 3) invocation notification "         \
3577           "frequency")                                                      \
3578                                                                             \
3579   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3580           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3581                                                                             \
3582   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3583           "Interpreter (tier 0) invocation notification frequency")         \
3584                                                                             \
3585   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3586           "C1 without MDO (tier 2) invocation notification frequency")      \
3587                                                                             \
3588   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3589           "C1 with MDO profiling (tier 3) invocation notification "         \
3590           "frequency")                                                      \
3591                                                                             \
3592   product(intx, Tier2CompileThreshold, 0,                                   \
3593           "threshold at which tier 2 compilation is invoked")               \
3594                                                                             \
3595   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3596           "Back edge threshold at which tier 2 compilation is invoked")     \
3597                                                                             \
3598   product(intx, Tier3InvocationThreshold, 200,                              \
3599           "Compile if number of method invocations crosses this "           \
3600           "threshold")                                                      \
3601                                                                             \
3602   product(intx, Tier3MinInvocationThreshold, 100,                           \
3603           "Minimum invocation to compile at tier 3")                        \
3604                                                                             \
3605   product(intx, Tier3CompileThreshold, 2000,                                \
3606           "Threshold at which tier 3 compilation is invoked (invocation "   \
3607           "minimum must be satisfied")                                      \
3608                                                                             \
3609   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3610           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3611                                                                             \
3612   product(intx, Tier4InvocationThreshold, 5000,                             \
3613           "Compile if number of method invocations crosses this "           \
3614           "threshold")                                                      \
3615                                                                             \
3616   product(intx, Tier4MinInvocationThreshold, 600,                           \
3617           "Minimum invocation to compile at tier 4")                        \
3618                                                                             \
3619   product(intx, Tier4CompileThreshold, 15000,                               \
3620           "Threshold at which tier 4 compilation is invoked (invocation "   \
3621           "minimum must be satisfied")                                      \
3622                                                                             \
3623   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3624           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3625                                                                             \
3626   product(intx, Tier3DelayOn, 5,                                            \
3627           "If C2 queue size grows over this amount per compiler thread "    \
3628           "stop compiling at tier 3 and start compiling at tier 2")         \
3629                                                                             \
3630   product(intx, Tier3DelayOff, 2,                                           \
3631           "If C2 queue size is less than this amount per compiler thread "  \
3632           "allow methods compiled at tier 2 transition to tier 3")          \
3633                                                                             \
3634   product(intx, Tier3LoadFeedback, 5,                                       \
3635           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3636           "reaches this amount per compiler thread")                        \
3637                                                                             \
3638   product(intx, Tier4LoadFeedback, 3,                                       \
3639           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3640           "reaches this amount per compiler thread")                        \
3641                                                                             \
3642   product(intx, TieredCompileTaskTimeout, 50,                               \
3643           "Kill compile task if method was not used within "                \
3644           "given timeout in milliseconds")                                  \
3645                                                                             \
3646   product(intx, TieredStopAtLevel, 4,                                       \
3647           "Stop at given compilation level")                                \
3648                                                                             \
3649   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3650           "Start profiling in interpreter if the counters exceed tier 3 "   \
3651           "thresholds by the specified percentage")                         \
3652                                                                             \
3653   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3654           "Increase the compile threshold for C1 compilation if the code "  \
3655           "cache is filled by the specified percentage")                    \
3656                                                                             \
3657   product(intx, TieredRateUpdateMinTime, 1,                                 \
3658           "Minimum rate sampling interval (in milliseconds)")               \
3659                                                                             \
3660   product(intx, TieredRateUpdateMaxTime, 25,                                \
3661           "Maximum rate sampling interval (in milliseconds)")               \
3662                                                                             \
3663   product_pd(bool, TieredCompilation,                                       \
3664           "Enable tiered compilation")                                      \
3665                                                                             \
3666   product(bool, PrintTieredEvents, false,                                   \
3667           "Print tiered events notifications")                              \
3668                                                                             \
3669   product_pd(intx, OnStackReplacePercentage,                                \
3670           "NON_TIERED number of method invocations/branches (expressed as " \
3671           "% of CompileThreshold) before (re-)compiling OSR code")          \
3672                                                                             \
3673   product(intx, InterpreterProfilePercentage, 33,                           \
3674           "NON_TIERED number of method invocations/branches (expressed as " \
3675           "% of CompileThreshold) before profiling in the interpreter")     \
3676                                                                             \
3677   develop(intx, MaxRecompilationSearchLength,    10,                        \
3678           "The maximum number of frames to inspect when searching for "     \
3679           "recompilee")                                                     \
3680                                                                             \
3681   develop(intx, MaxInterpretedSearchLength,     3,                          \
3682           "The maximum number of interpreted frames to skip when searching "\
3683           "for recompilee")                                                 \
3684                                                                             \
3685   develop(intx, DesiredMethodLimit,  8000,                                  \
3686           "The desired maximum method size (in bytecodes) after inlining")  \
3687                                                                             \
3688   develop(intx, HugeMethodLimit,  8000,                                     \
3689           "Don't compile methods larger than this if "                      \
3690           "+DontCompileHugeMethods")                                        \
3691                                                                             \
3692   /* New JDK 1.4 reflection implementation */                               \
3693                                                                             \
3694   develop(intx, FastSuperclassLimit, 8,                                     \
3695           "Depth of hardwired instanceof accelerator array")                \
3696                                                                             \
3697   /* Properties for Java libraries  */                                      \
3698                                                                             \
3699   product(size_t, MaxDirectMemorySize, 0,                                   \
3700           "Maximum total size of NIO direct-buffer allocations")            \
3701                                                                             \
3702   /* Flags used for temporary code during development  */                   \
3703                                                                             \
3704   diagnostic(bool, UseNewCode, false,                                       \
3705           "Testing Only: Use the new version while testing")                \
3706                                                                             \
3707   diagnostic(bool, UseNewCode2, false,                                      \
3708           "Testing Only: Use the new version while testing")                \
3709                                                                             \
3710   diagnostic(bool, UseNewCode3, false,                                      \
3711           "Testing Only: Use the new version while testing")                \
3712                                                                             \
3713   /* flags for performance data collection */                               \
3714                                                                             \
3715   product(bool, UsePerfData, falseInEmbedded,                               \
3716           "Flag to disable jvmstat instrumentation for performance testing "\
3717           "and problem isolation purposes")                                 \
3718                                                                             \
3719   product(bool, PerfDataSaveToFile, false,                                  \
3720           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3721                                                                             \
3722   product(ccstr, PerfDataSaveFile, NULL,                                    \
3723           "Save PerfData memory to the specified absolute pathname. "       \
3724           "The string %p in the file name (if present) "                    \
3725           "will be replaced by pid")                                        \
3726                                                                             \
3727   product(intx, PerfDataSamplingInterval, 50,                               \
3728           "Data sampling interval (in milliseconds)")                       \
3729                                                                             \
3730   develop(bool, PerfTraceDataCreation, false,                               \
3731           "Trace creation of Performance Data Entries")                     \
3732                                                                             \
3733   develop(bool, PerfTraceMemOps, false,                                     \
3734           "Trace PerfMemory create/attach/detach calls")                    \
3735                                                                             \
3736   product(bool, PerfDisableSharedMem, false,                                \
3737           "Store performance data in standard memory")                      \
3738                                                                             \
3739   product(intx, PerfDataMemorySize, 32*K,                                   \
3740           "Size of performance data memory region. Will be rounded "        \
3741           "up to a multiple of the native os page size.")                   \
3742                                                                             \
3743   product(intx, PerfMaxStringConstLength, 1024,                             \
3744           "Maximum PerfStringConstant string length before truncation")     \
3745                                                                             \
3746   product(bool, PerfAllowAtExitRegistration, false,                         \
3747           "Allow registration of atexit() methods")                         \
3748                                                                             \
3749   product(bool, PerfBypassFileSystemCheck, false,                           \
3750           "Bypass Win32 file system criteria checks (Windows Only)")        \
3751                                                                             \
3752   product(intx, UnguardOnExecutionViolation, 0,                             \
3753           "Unguard page and retry on no-execute fault (Win32 only) "        \
3754           "0=off, 1=conservative, 2=aggressive")                            \
3755                                                                             \
3756   /* Serviceability Support */                                              \
3757                                                                             \
3758   product(bool, ManagementServer, false,                                    \
3759           "Create JMX Management Server")                                   \
3760                                                                             \
3761   product(bool, DisableAttachMechanism, false,                              \
3762           "Disable mechanism that allows tools to attach to this VM")       \
3763                                                                             \
3764   product(bool, StartAttachListener, false,                                 \
3765           "Always start Attach Listener at VM startup")                     \
3766                                                                             \
3767   manageable(bool, PrintConcurrentLocks, false,                             \
3768           "Print java.util.concurrent locks in thread dump")                \
3769                                                                             \
3770   product(bool, TransmitErrorReport, false,                                 \
3771           "Enable error report transmission on erroneous termination")      \
3772                                                                             \
3773   product(ccstr, ErrorReportServer, NULL,                                   \
3774           "Override built-in error report server address")                  \
3775                                                                             \
3776   /* Shared spaces */                                                       \
3777                                                                             \
3778   product(bool, UseSharedSpaces, true,                                      \
3779           "Use shared spaces for metadata")                                 \
3780                                                                             \
3781   product(bool, VerifySharedSpaces, false,                                  \
3782           "Verify shared spaces (false for default archive, true for "      \
3783           "archive specified by -XX:SharedArchiveFile)")                    \
3784                                                                             \
3785   product(bool, RequireSharedSpaces, false,                                 \
3786           "Require shared spaces for metadata")                             \
3787                                                                             \
3788   product(bool, DumpSharedSpaces, false,                                    \
3789           "Special mode: JVM reads a class list, loads classes, builds "    \
3790           "shared spaces, and dumps the shared spaces to a file to be "     \
3791           "used in future JVM runs")                                        \
3792                                                                             \
3793   product(bool, PrintSharedSpaces, false,                                   \
3794           "Print usage of shared spaces")                                   \
3795                                                                             \
3796   product(bool, PrintSharedArchiveAndExit, false,                           \
3797           "Print shared archive file contents")                             \
3798                                                                             \
3799   product(bool, PrintSharedDictionary, false,                               \
3800           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3801           "dictionary")                                                     \
3802                                                                             \
3803   product(size_t, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),     \
3804           "Size of read-write space for metadata (in bytes)")               \
3805                                                                             \
3806   product(size_t, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3807           "Size of read-only space for metadata (in bytes)")                \
3808                                                                             \
3809   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3810           "Size of the shared miscellaneous data area (in bytes)")          \
3811                                                                             \
3812   product(uintx, SharedMiscCodeSize,    120*K,                              \
3813           "Size of the shared miscellaneous code area (in bytes)")          \
3814                                                                             \
3815   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3816           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3817           "Address to allocate shared memory region for class data")        \
3818                                                                             \
3819   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3820           "Average number of symbols per bucket in shared table")           \
3821                                                                             \
3822   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3823           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3824           "classes. Just exclude them from the shared dictionary.")         \
3825                                                                             \
3826   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3827           "Print generated stub code for method handles")                   \
3828                                                                             \
3829   develop(bool, TraceMethodHandles, false,                                  \
3830           "trace internal method handle operations")                        \
3831                                                                             \
3832   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3833           "perform extra checks when constructing method handles")          \
3834                                                                             \
3835   diagnostic(bool, ShowHiddenFrames, false,                                 \
3836           "show method handle implementation frames (usually hidden)")      \
3837                                                                             \
3838   experimental(bool, TrustFinalNonStaticFields, false,                      \
3839           "trust final non-static declarations for constant folding")       \
3840                                                                             \
3841   diagnostic(bool, FoldStableValues, true,                                  \
3842           "Optimize loads from stable fields (marked w/ @Stable)")          \
3843                                                                             \
3844   develop(bool, TraceInvokeDynamic, false,                                  \
3845           "trace internal invoke dynamic operations")                       \
3846                                                                             \
3847   diagnostic(bool, PauseAtStartup,      false,                              \
3848           "Causes the VM to pause at startup time and wait for the pause "  \
3849           "file to be removed (default: ./vm.paused.<pid>)")                \
3850                                                                             \
3851   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3852           "The file to create and for whose removal to await when pausing " \
3853           "at startup. (default: ./vm.paused.<pid>)")                       \
3854                                                                             \
3855   diagnostic(bool, PauseAtExit, false,                                      \
3856           "Pause and wait for keypress on exit if a debugger is attached")  \
3857                                                                             \
3858   product(bool, ExtendedDTraceProbes,    false,                             \
3859           "Enable performance-impacting dtrace probes")                     \
3860                                                                             \
3861   product(bool, DTraceMethodProbes, false,                                  \
3862           "Enable dtrace probes for method-entry and method-exit")          \
3863                                                                             \
3864   product(bool, DTraceAllocProbes, false,                                   \
3865           "Enable dtrace probes for object allocation")                     \
3866                                                                             \
3867   product(bool, DTraceMonitorProbes, false,                                 \
3868           "Enable dtrace probes for monitor events")                        \
3869                                                                             \
3870   product(bool, RelaxAccessControlCheck, false,                             \
3871           "Relax the access control checks in the verifier")                \
3872                                                                             \
3873   product(uintx, StringTableSize, defaultStringTableSize,                   \
3874           "Number of buckets in the interned String table")                 \
3875                                                                             \
3876   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3877           "Number of buckets in the JVM internal Symbol table")             \
3878                                                                             \
3879   product(bool, UseStringDeduplication, false,                              \
3880           "Use string deduplication")                                       \
3881                                                                             \
3882   product(bool, PrintStringDeduplicationStatistics, false,                  \
3883           "Print string deduplication statistics")                          \
3884                                                                             \
3885   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3886           "A string must reach this age (or be promoted to an old region) " \
3887           "to be considered for deduplication")                             \
3888                                                                             \
3889   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3890           "Force table resize every time the table is scanned")             \
3891                                                                             \
3892   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3893           "Force table rehash every time the table is scanned")             \
3894                                                                             \
3895   develop(bool, TraceDefaultMethods, false,                                 \
3896           "Trace the default method processing steps")                      \
3897                                                                             \
3898   develop(bool, VerifyGenericSignatures, false,                             \
3899           "Abort VM on erroneous or inconsistent generic signatures")       \
3900                                                                             \
3901   diagnostic(bool, WhiteBoxAPI, false,                                      \
3902           "Enable internal testing APIs")                                   \
3903                                                                             \
3904   product(bool, PrintGCCause, true,                                         \
3905           "Include GC cause in GC logging")                                 \
3906                                                                             \
3907   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
3908            "Default survivor space alignment in bytes")                     \
3909                                                                             \
3910   product(bool , AllowNonVirtualCalls, false,                               \
3911           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3912                                                                             \
3913   product(ccstr, DumpLoadedClassList, NULL,                                 \
3914           "Dump the names all loaded classes, that could be stored into "   \
3915           "the CDS archive, in the specified file")                         \
3916                                                                             \
3917   product(ccstr, SharedClassListFile, NULL,                                 \
3918           "Override the default CDS class list")                            \
3919                                                                             \
3920   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3921           "Override the default location of the CDS archive file")          \
3922                                                                             \
3923   product(ccstr, ExtraSharedClassListFile, NULL,                            \
3924           "Extra classlist for building the CDS archive file")              \
3925                                                                             \
3926   experimental(size_t, ArrayAllocatorMallocLimit,                           \
3927           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
3928           "Allocation less than this value will be allocated "              \
3929           "using malloc. Larger allocations will use mmap.")                \
3930                                                                             \
3931   experimental(bool, AlwaysAtomicAccesses, false,                           \
3932           "Accesses to all variables should always be atomic")              \
3933                                                                             \
3934   product(bool, EnableTracing, false,                                       \
3935           "Enable event-based tracing")                                     \
3936                                                                             \
3937   product(bool, UseLockedTracing, false,                                    \
3938           "Use locked-tracing when doing event-based tracing")              \
3939                                                                             \
3940   diagnostic(bool, UseUnalignedAccesses, false,                             \
3941           "Use unaligned memory accesses in sun.misc.Unsafe")               \
3942                                                                             \
3943   product_pd(bool, PreserveFramePointer,                                    \
3944              "Use the FP register for holding the frame pointer "           \
3945              "and not as a general purpose register.")                      \
3946                                                                             \
3947   diagnostic(bool, CheckIntrinsics, trueInDebug,                            \
3948              "When a class C is loaded, check that "                        \
3949              "(1) all intrinsics defined by the VM for class C are present "\
3950              "in the loaded class file and are marked with the "            \
3951              "@HotSpotIntrinsicCandidate annotation and also that "         \
3952              "(2) there is an intrinsic registered for all loaded methods " \
3953              "that are annotated with the @HotSpotIntrinsicCandidate "      \
3954              "annotation.")
3955 
3956 /*
3957  *  Macros for factoring of globals
3958  */
3959 
3960 // Interface macros
3961 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
3962 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
3963 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
3964 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3965 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
3966 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
3967 #ifdef PRODUCT
3968 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
3969 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
3970 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
3971 #else
3972 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
3973 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
3974 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
3975 #endif
3976 // Special LP64 flags, product only needed for now.
3977 #ifdef _LP64
3978 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3979 #else
3980 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3981 #endif // _LP64
3982 
3983 // Implementation macros
3984 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
3985 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
3986 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
3987 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3988 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
3989 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
3990 #ifdef PRODUCT
3991 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
3992 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
3993 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
3994 #else
3995 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
3996 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
3997 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
3998 #endif
3999 #ifdef _LP64
4000 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4001 #else
4002 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4003 #endif // _LP64
4004 
4005 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
4006 
4007 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
4008 
4009 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
4010 
4011 // Extensions
4012 
4013 #include "runtime/globals_ext.hpp"
4014 
4015 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---