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   enum Error {
 262     // no error
 263     SUCCESS = 0,
 264     // flag name is missing
 265     MISSING_NAME,
 266     // flag value is missing
 267     MISSING_VALUE,
 268     // error parsing the textual form of the value
 269     WRONG_FORMAT,
 270     // flag is not writeable
 271     NON_WRITABLE,
 272     // flag value is outside of its bounds
 273     OUT_OF_BOUNDS,
 274     // flag value violates its constraint
 275     VIOLATES_CONSTRAINT,
 276     // there is no flag with the given name
 277     INVALID_FLAG,
 278     // other, unspecified error related to setting the flag
 279     ERR_OTHER
 280   };
 281 
 282   const char* _type;
 283   const char* _name;
 284   void* _addr;
 285   NOT_PRODUCT(const char* _doc;)
 286   Flags _flags;
 287 
 288   // points to all Flags static array
 289   static Flag* flags;
 290 
 291   // number of flags
 292   static size_t numFlags;
 293 
 294   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 295   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 296   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 297 
 298   void check_writable();
 299 
 300   bool is_bool() const;
 301   bool get_bool() const;
 302   void set_bool(bool value);
 303 
 304   bool is_int() const;
 305   int get_int() const;
 306   void set_int(int value);
 307 
 308   bool is_uint() const;
 309   uint get_uint() const;
 310   void set_uint(uint value);
 311 
 312   bool is_intx() const;
 313   intx get_intx() const;
 314   void set_intx(intx value);
 315 
 316   bool is_uintx() const;
 317   uintx get_uintx() const;
 318   void set_uintx(uintx value);
 319 
 320   bool is_uint64_t() const;
 321   uint64_t get_uint64_t() const;
 322   void set_uint64_t(uint64_t value);
 323 
 324   bool is_size_t() const;
 325   size_t get_size_t() const;
 326   void set_size_t(size_t value);
 327 
 328   bool is_double() const;
 329   double get_double() const;
 330   void set_double(double value);
 331 
 332   bool is_ccstr() const;
 333   bool ccstr_accumulates() const;
 334   ccstr get_ccstr() const;
 335   void set_ccstr(ccstr value);
 336 
 337   Flags get_origin();
 338   void set_origin(Flags origin);
 339 
 340   bool is_default();
 341   bool is_ergonomic();
 342   bool is_command_line();
 343 
 344   bool is_product() const;
 345   bool is_manageable() const;
 346   bool is_diagnostic() const;
 347   bool is_experimental() const;
 348   bool is_notproduct() const;
 349   bool is_develop() const;
 350   bool is_read_write() const;
 351   bool is_commercial() const;
 352 
 353   bool is_constant_in_binary() const;
 354 
 355   bool is_unlocker() const;
 356   bool is_unlocked() const;
 357   bool is_writeable() const;
 358   bool is_external() const;
 359 
 360   bool is_unlocker_ext() const;
 361   bool is_unlocked_ext() const;
 362   bool is_writeable_ext() const;
 363   bool is_external_ext() const;
 364 
 365   void unlock_diagnostic();
 366 
 367   void get_locked_message(char*, int) const;
 368   void get_locked_message_ext(char*, int) const;
 369 
 370   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 371   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 372   void print_kind(outputStream* st);
 373   void print_as_flag(outputStream* st);
 374 
 375   static const char* flag_error_str(Flag::Error error);
 376 };
 377 
 378 // debug flags control various aspects of the VM and are global accessible
 379 
 380 // use FlagSetting to temporarily change some debug flag
 381 // e.g. FlagSetting fs(DebugThisAndThat, true);
 382 // restored to previous value upon leaving scope
 383 class FlagSetting {
 384   bool val;
 385   bool* flag;
 386  public:
 387   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 388   ~FlagSetting()                       { *flag = val; }
 389 };
 390 
 391 
 392 class CounterSetting {
 393   intx* counter;
 394  public:
 395   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 396   ~CounterSetting()         { (*counter)--; }
 397 };
 398 
 399 class IntFlagSetting {
 400   int val;
 401   int* flag;
 402  public:
 403   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 404   ~IntFlagSetting()                     { *flag = val; }
 405 };
 406 
 407 class UIntFlagSetting {
 408   uint val;
 409   uint* flag;
 410  public:
 411   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 412   ~UIntFlagSetting()                       { *flag = val; }
 413 };
 414 
 415 class UIntXFlagSetting {
 416   uintx val;
 417   uintx* flag;
 418  public:
 419   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 420   ~UIntXFlagSetting()                         { *flag = val; }
 421 };
 422 
 423 class DoubleFlagSetting {
 424   double val;
 425   double* flag;
 426  public:
 427   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 428   ~DoubleFlagSetting()                           { *flag = val; }
 429 };
 430 
 431 class SizeTFlagSetting {
 432   size_t val;
 433   size_t* flag;
 434  public:
 435   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 436   ~SizeTFlagSetting()                           { *flag = val; }
 437 };
 438 
 439 
 440 class CommandLineFlags {
 441 public:
 442   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 443   static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false)      { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
 444   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 445   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 446 
 447   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 448   static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false)      { return intAt(name, strlen(name), value, allow_locked, return_flag); }
 449   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 450   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 451 
 452   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 453   static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false)      { return uintAt(name, strlen(name), value, allow_locked, return_flag); }
 454   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 455   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 456 
 457   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 458   static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false)      { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
 459   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 460   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 461 
 462   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 463   static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false)    { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
 464   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 465   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 466 
 467   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 468   static Flag::Error 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); }
 469   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 470   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 471 
 472   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 473   static Flag::Error 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); }
 474   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 475   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 476 
 477   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 478   static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false)    { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
 479   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 480   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 481 
 482   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 483   static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false)    { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
 484   // Contract:  Flag will make private copy of the incoming value.
 485   // Outgoing value is always malloc-ed, and caller MUST call free.
 486   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 487   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 488 
 489   // Returns false if name is not a command line flag.
 490   static bool wasSetOnCmdline(const char* name, bool* value);
 491   static void printSetFlags(outputStream* out);
 492 
 493   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 494   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 495 
 496   static void verify() PRODUCT_RETURN;
 497 };
 498 
 499 // use this for flags that are true by default in the debug version but
 500 // false in the optimized version, and vice versa
 501 #ifdef ASSERT
 502 #define trueInDebug  true
 503 #define falseInDebug false
 504 #else
 505 #define trueInDebug  false
 506 #define falseInDebug true
 507 #endif
 508 
 509 // use this for flags that are true per default in the product build
 510 // but false in development builds, and vice versa
 511 #ifdef PRODUCT
 512 #define trueInProduct  true
 513 #define falseInProduct false
 514 #else
 515 #define trueInProduct  false
 516 #define falseInProduct true
 517 #endif
 518 
 519 #ifdef JAVASE_EMBEDDED
 520 #define falseInEmbedded false
 521 #else
 522 #define falseInEmbedded true
 523 #endif
 524 
 525 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 526 // product flags are always settable / visible
 527 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 528 
 529 // A flag must be declared with one of the following types:
 530 // bool, intx, uintx, size_t, ccstr, double, or uint64_t.
 531 // The type "ccstr" is an alias for "const char*" and is used
 532 // only in this file, because the macrology requires single-token type names.
 533 
 534 // Note: Diagnostic options not meant for VM tuning or for product modes.
 535 // They are to be used for VM quality assurance or field diagnosis
 536 // of VM bugs.  They are hidden so that users will not be encouraged to
 537 // try them as if they were VM ordinary execution options.  However, they
 538 // are available in the product version of the VM.  Under instruction
 539 // from support engineers, VM customers can turn them on to collect
 540 // diagnostic information about VM problems.  To use a VM diagnostic
 541 // option, you must first specify +UnlockDiagnosticVMOptions.
 542 // (This master switch also affects the behavior of -Xprintflags.)
 543 //
 544 // experimental flags are in support of features that are not
 545 //    part of the officially supported product, but are available
 546 //    for experimenting with. They could, for example, be performance
 547 //    features that may not have undergone full or rigorous QA, but which may
 548 //    help performance in some cases and released for experimentation
 549 //    by the community of users and developers. This flag also allows one to
 550 //    be able to build a fully supported product that nonetheless also
 551 //    ships with some unsupported, lightly tested, experimental features.
 552 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 553 //    UnlockExperimentalVMOptions flag, which allows the control and
 554 //    modification of the experimental flags.
 555 //
 556 // Nota bene: neither diagnostic nor experimental options should be used casually,
 557 //    and they are not supported on production loads, except under explicit
 558 //    direction from support engineers.
 559 //
 560 // manageable flags are writeable external product flags.
 561 //    They are dynamically writeable through the JDK management interface
 562 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 563 //    These flags are external exported interface (see CCC).  The list of
 564 //    manageable flags can be queried programmatically through the management
 565 //    interface.
 566 //
 567 //    A flag can be made as "manageable" only if
 568 //    - the flag is defined in a CCC as an external exported interface.
 569 //    - the VM implementation supports dynamic setting of the flag.
 570 //      This implies that the VM must *always* query the flag variable
 571 //      and not reuse state related to the flag state at any given time.
 572 //    - you want the flag to be queried programmatically by the customers.
 573 //
 574 // product_rw flags are writeable internal product flags.
 575 //    They are like "manageable" flags but for internal/private use.
 576 //    The list of product_rw flags are internal/private flags which
 577 //    may be changed/removed in a future release.  It can be set
 578 //    through the management interface to get/set value
 579 //    when the name of flag is supplied.
 580 //
 581 //    A flag can be made as "product_rw" only if
 582 //    - the VM implementation supports dynamic setting of the flag.
 583 //      This implies that the VM must *always* query the flag variable
 584 //      and not reuse state related to the flag state at any given time.
 585 //
 586 // Note that when there is a need to support develop flags to be writeable,
 587 // it can be done in the same way as product_rw.
 588 //
 589 // range is a macro that will expand to min and max arguments for range
 590 //    checking code if provided - see commandLineFlagRangeList.hpp
 591 //
 592 // constraint is a macro that will expand to custom function call
 593 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 594 //
 595 
 596 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
 597                                                                             \
 598   lp64_product(bool, UseCompressedOops, false,                              \
 599           "Use 32-bit object references in 64-bit VM. "                     \
 600           "lp64_product means flag is always constant in 32 bit VM")        \
 601                                                                             \
 602   lp64_product(bool, UseCompressedClassPointers, false,                     \
 603           "Use 32-bit class pointers in 64-bit VM. "                        \
 604           "lp64_product means flag is always constant in 32 bit VM")        \
 605                                                                             \
 606   notproduct(bool, CheckCompressedOops, true,                               \
 607           "Generate checks in encoding/decoding code in debug VM")          \
 608                                                                             \
 609   product_pd(size_t, HeapBaseMinAddress,                                    \
 610           "OS specific low limit for heap base address")                    \
 611                                                                             \
 612   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 613           "Heap allocation steps through preferred address regions to find" \
 614           " where it can allocate the heap. Number of steps to take per "   \
 615           "region.")                                                        \
 616           range(1, max_uintx)                                               \
 617                                                                             \
 618   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 619           "Print compressed oops base address and encoding mode")           \
 620                                                                             \
 621   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 622           "Default object alignment in bytes, 8 is minimum")                \
 623           range(8, 256)                                                     \
 624           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 625                                                                             \
 626   product(bool, AssumeMP, false,                                            \
 627           "Instruct the VM to assume multiple processors are available")    \
 628                                                                             \
 629   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 630   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 631   /* been re-added (see 6401008)                                         */ \
 632   product_pd(bool, UseMembar,                                               \
 633           "(Unstable) Issues membars on thread state transitions")          \
 634                                                                             \
 635   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 636           "Clean the chunk pool asynchronously")                            \
 637                                                                             \
 638   experimental(bool, AlwaysSafeConstructors, false,                         \
 639           "Force safe construction, as if all fields are final.")           \
 640                                                                             \
 641   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 642           "Enable normal processing of flags relating to field diagnostics")\
 643                                                                             \
 644   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 645           "Enable normal processing of flags relating to experimental "     \
 646           "features")                                                       \
 647                                                                             \
 648   product(bool, JavaMonitorsInStackTrace, true,                             \
 649           "Print information about Java monitor locks when the stacks are"  \
 650           "dumped")                                                         \
 651                                                                             \
 652   product_pd(bool, UseLargePages,                                           \
 653           "Use large page memory")                                          \
 654                                                                             \
 655   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 656           "Allocate large pages individually for better affinity")          \
 657                                                                             \
 658   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 659           "Fail large pages individual allocation")                         \
 660                                                                             \
 661   product(bool, UseLargePagesInMetaspace, false,                            \
 662           "Use large page memory in metaspace. "                            \
 663           "Only used if UseLargePages is enabled.")                         \
 664                                                                             \
 665   develop(bool, TracePageSizes, false,                                      \
 666           "Trace page size selection and usage")                            \
 667                                                                             \
 668   product(bool, UseNUMA, false,                                             \
 669           "Use NUMA if available")                                          \
 670                                                                             \
 671   product(bool, UseNUMAInterleaving, false,                                 \
 672           "Interleave memory across NUMA nodes if available")               \
 673                                                                             \
 674   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 675           "Granularity to use for NUMA interleaving on Windows OS")         \
 676                                                                             \
 677   product(bool, ForceNUMA, false,                                           \
 678           "Force NUMA optimizations on single-node/UMA systems")            \
 679                                                                             \
 680   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 681           "Percentage (0-100) used to weight the current sample when "      \
 682           "computing exponentially decaying average for "                   \
 683           "AdaptiveNUMAChunkSizing")                                        \
 684           range(0, 100)                                                     \
 685                                                                             \
 686   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 687           "Do not reallocate more than this amount per collection")         \
 688                                                                             \
 689   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 690           "Enable adaptive chunk sizing for NUMA")                          \
 691                                                                             \
 692   product(bool, NUMAStats, false,                                           \
 693           "Print NUMA stats in detailed heap information")                  \
 694                                                                             \
 695   product(uintx, NUMAPageScanRate, 256,                                     \
 696           "Maximum number of pages to include in the page scan procedure")  \
 697                                                                             \
 698   product_pd(bool, NeedsDeoptSuspend,                                       \
 699           "True for register window machines (sparc/ia64)")                 \
 700                                                                             \
 701   product(intx, UseSSE, 99,                                                 \
 702           "Highest supported SSE instructions set on x86/x64")              \
 703                                                                             \
 704   product(bool, UseAES, false,                                              \
 705           "Control whether AES instructions can be used on x86/x64")        \
 706                                                                             \
 707   product(bool, UseSHA, false,                                              \
 708           "Control whether SHA instructions can be used "                   \
 709           "on SPARC and on ARM")                                            \
 710                                                                             \
 711   product(bool, UseGHASHIntrinsics, false,                                  \
 712           "Use intrinsics for GHASH versions of crypto")                    \
 713                                                                             \
 714   product(size_t, LargePageSizeInBytes, 0,                                  \
 715           "Large page size (0 to let VM choose the page size)")             \
 716                                                                             \
 717   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 718           "Use large pages if maximum heap is at least this big")           \
 719                                                                             \
 720   product(bool, ForceTimeHighResolution, false,                             \
 721           "Using high time resolution (for Win32 only)")                    \
 722                                                                             \
 723   develop(bool, TraceItables, false,                                        \
 724           "Trace initialization and use of itables")                        \
 725                                                                             \
 726   develop(bool, TracePcPatching, false,                                     \
 727           "Trace usage of frame::patch_pc")                                 \
 728                                                                             \
 729   develop(bool, TraceJumps, false,                                          \
 730           "Trace assembly jumps in thread ring buffer")                     \
 731                                                                             \
 732   develop(bool, TraceRelocator, false,                                      \
 733           "Trace the bytecode relocator")                                   \
 734                                                                             \
 735   develop(bool, TraceLongCompiles, false,                                   \
 736           "Print out every time compilation is longer than "                \
 737           "a given threshold")                                              \
 738                                                                             \
 739   develop(bool, SafepointALot, false,                                       \
 740           "Generate a lot of safepoints. This works with "                  \
 741           "GuaranteedSafepointInterval")                                    \
 742                                                                             \
 743   product_pd(bool, BackgroundCompilation,                                   \
 744           "A thread requesting compilation is not blocked during "          \
 745           "compilation")                                                    \
 746                                                                             \
 747   product(bool, PrintVMQWaitTime, false,                                    \
 748           "Print out the waiting time in VM operation queue")               \
 749                                                                             \
 750   develop(bool, TraceOopMapGeneration, false,                               \
 751           "Show OopMapGeneration")                                          \
 752                                                                             \
 753   product(bool, MethodFlushing, true,                                       \
 754           "Reclamation of zombie and not-entrant methods")                  \
 755                                                                             \
 756   develop(bool, VerifyStack, false,                                         \
 757           "Verify stack of each thread when it is entering a runtime call") \
 758                                                                             \
 759   diagnostic(bool, ForceUnreachable, false,                                 \
 760           "Make all non code cache addresses to be unreachable by "         \
 761           "forcing use of 64bit literal fixups")                            \
 762                                                                             \
 763   notproduct(bool, StressDerivedPointers, false,                            \
 764           "Force scavenge when a derived pointer is detected on stack "     \
 765           "after rtm call")                                                 \
 766                                                                             \
 767   develop(bool, TraceDerivedPointers, false,                                \
 768           "Trace traversal of derived pointers on stack")                   \
 769                                                                             \
 770   notproduct(bool, TraceCodeBlobStacks, false,                              \
 771           "Trace stack-walk of codeblobs")                                  \
 772                                                                             \
 773   product(bool, PrintJNIResolving, false,                                   \
 774           "Used to implement -v:jni")                                       \
 775                                                                             \
 776   notproduct(bool, PrintRewrites, false,                                    \
 777           "Print methods that are being rewritten")                         \
 778                                                                             \
 779   product(bool, UseInlineCaches, true,                                      \
 780           "Use Inline Caches for virtual calls ")                           \
 781                                                                             \
 782   develop(bool, InlineArrayCopy, true,                                      \
 783           "Inline arraycopy native that is known to be part of "            \
 784           "base library DLL")                                               \
 785                                                                             \
 786   develop(bool, InlineObjectHash, true,                                     \
 787           "Inline Object::hashCode() native that is known to be part "      \
 788           "of base library DLL")                                            \
 789                                                                             \
 790   develop(bool, InlineNatives, true,                                        \
 791           "Inline natives that are known to be part of base library DLL")   \
 792                                                                             \
 793   develop(bool, InlineMathNatives, true,                                    \
 794           "Inline SinD, CosD, etc.")                                        \
 795                                                                             \
 796   develop(bool, InlineClassNatives, true,                                   \
 797           "Inline Class.isInstance, etc")                                   \
 798                                                                             \
 799   develop(bool, InlineThreadNatives, true,                                  \
 800           "Inline Thread.currentThread, etc")                               \
 801                                                                             \
 802   develop(bool, InlineUnsafeOps, true,                                      \
 803           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
 804                                                                             \
 805   product(bool, CriticalJNINatives, true,                                   \
 806           "Check for critical JNI entry points")                            \
 807                                                                             \
 808   notproduct(bool, StressCriticalJNINatives, false,                         \
 809           "Exercise register saving code in critical natives")              \
 810                                                                             \
 811   product(bool, UseSSE42Intrinsics, false,                                  \
 812           "SSE4.2 versions of intrinsics")                                  \
 813                                                                             \
 814   product(bool, UseAESIntrinsics, false,                                    \
 815           "Use intrinsics for AES versions of crypto")                      \
 816                                                                             \
 817   product(bool, UseSHA1Intrinsics, false,                                   \
 818           "Use intrinsics for SHA-1 crypto hash function. "                 \
 819           "Requires that UseSHA is enabled.")                               \
 820                                                                             \
 821   product(bool, UseSHA256Intrinsics, false,                                 \
 822           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 823           "Requires that UseSHA is enabled.")                               \
 824                                                                             \
 825   product(bool, UseSHA512Intrinsics, false,                                 \
 826           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 827           "Requires that UseSHA is enabled.")                               \
 828                                                                             \
 829   product(bool, UseCRC32Intrinsics, false,                                  \
 830           "use intrinsics for java.util.zip.CRC32")                         \
 831                                                                             \
 832   product(bool, UseCRC32CIntrinsics, false,                                 \
 833           "use intrinsics for java.util.zip.CRC32C")                        \
 834                                                                             \
 835   product(bool, UseAdler32Intrinsics, false,                                \
 836           "use intrinsics for java.util.zip.Adler32")                       \
 837                                                                             \
 838   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 839          "do not expand intrinsics whose (internal) names appear here")     \
 840                                                                             \
 841   develop(bool, TraceCallFixup, false,                                      \
 842           "Trace all call fixups")                                          \
 843                                                                             \
 844   develop(bool, DeoptimizeALot, false,                                      \
 845           "Deoptimize at every exit from the runtime system")               \
 846                                                                             \
 847   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 848           "A comma separated list of bcis to deoptimize at")                \
 849                                                                             \
 850   product(bool, DeoptimizeRandom, false,                                    \
 851           "Deoptimize random frames on random exit from the runtime system")\
 852                                                                             \
 853   notproduct(bool, ZombieALot, false,                                       \
 854           "Create zombies (non-entrant) at exit from the runtime system")   \
 855                                                                             \
 856   product(bool, UnlinkSymbolsALot, false,                                   \
 857           "Unlink unreferenced symbols from the symbol table at safepoints")\
 858                                                                             \
 859   notproduct(bool, WalkStackALot, false,                                    \
 860           "Trace stack (no print) at every exit from the runtime system")   \
 861                                                                             \
 862   product(bool, Debugging, false,                                           \
 863           "Set when executing debug methods in debug.cpp "                  \
 864           "(to prevent triggering assertions)")                             \
 865                                                                             \
 866   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 867           "Enable strict checks that safepoints cannot happen for threads " \
 868           "that use No_Safepoint_Verifier")                                 \
 869                                                                             \
 870   notproduct(bool, VerifyLastFrame, false,                                  \
 871           "Verify oops on last frame on entry to VM")                       \
 872                                                                             \
 873   develop(bool, TraceHandleAllocation, false,                               \
 874           "Print out warnings when suspiciously many handles are allocated")\
 875                                                                             \
 876   product(bool, FailOverToOldVerifier, true,                                \
 877           "Fail over to old verifier when split verifier fails")            \
 878                                                                             \
 879   develop(bool, ShowSafepointMsgs, false,                                   \
 880           "Show message about safepoint synchronization")                   \
 881                                                                             \
 882   product(bool, SafepointTimeout, false,                                    \
 883           "Time out and warn or fail after SafepointTimeoutDelay "          \
 884           "milliseconds if failed to reach safepoint")                      \
 885                                                                             \
 886   develop(bool, DieOnSafepointTimeout, false,                               \
 887           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 888                                                                             \
 889   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 890   /* typically, at most a few retries are needed                    */      \
 891   product(intx, SuspendRetryCount, 50,                                      \
 892           "Maximum retry count for an external suspend request")            \
 893                                                                             \
 894   product(intx, SuspendRetryDelay, 5,                                       \
 895           "Milliseconds to delay per retry (* current_retry_count)")        \
 896                                                                             \
 897   product(bool, AssertOnSuspendWaitFailure, false,                          \
 898           "Assert/Guarantee on external suspend wait failure")              \
 899                                                                             \
 900   product(bool, TraceSuspendWaitFailures, false,                            \
 901           "Trace external suspend wait failures")                           \
 902                                                                             \
 903   product(bool, MaxFDLimit, true,                                           \
 904           "Bump the number of file descriptors to maximum in Solaris")      \
 905                                                                             \
 906   diagnostic(bool, LogEvents, true,                                         \
 907           "Enable the various ring buffer event logs")                      \
 908                                                                             \
 909   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 910           "Number of ring buffer event logs")                               \
 911           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 912                                                                             \
 913   product(bool, BytecodeVerificationRemote, true,                           \
 914           "Enable the Java bytecode verifier for remote classes")           \
 915                                                                             \
 916   product(bool, BytecodeVerificationLocal, false,                           \
 917           "Enable the Java bytecode verifier for local classes")            \
 918                                                                             \
 919   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 920           "Force exceptions on FP stack under/overflow")                    \
 921                                                                             \
 922   develop(bool, VerifyStackAtCalls, false,                                  \
 923           "Verify that the stack pointer is unchanged after calls")         \
 924                                                                             \
 925   develop(bool, TraceJavaAssertions, false,                                 \
 926           "Trace java language assertions")                                 \
 927                                                                             \
 928   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 929           "Temporary - see javaClasses.cpp")                                \
 930                                                                             \
 931   notproduct(bool, PrintMallocFree, false,                                  \
 932           "Trace calls to C heap malloc/free allocation")                   \
 933                                                                             \
 934   product(bool, PrintOopAddress, false,                                     \
 935           "Always print the location of the oop")                           \
 936                                                                             \
 937   notproduct(bool, VerifyCodeCache, false,                                  \
 938           "Verify code cache on memory allocation/deallocation")            \
 939                                                                             \
 940   develop(bool, UseMallocOnly, false,                                       \
 941           "Use only malloc/free for allocation (no resource area/arena)")   \
 942                                                                             \
 943   develop(bool, PrintMalloc, false,                                         \
 944           "Print all malloc/free calls")                                    \
 945                                                                             \
 946   develop(bool, PrintMallocStatistics, false,                               \
 947           "Print malloc/free statistics")                                   \
 948                                                                             \
 949   develop(bool, ZapResourceArea, trueInDebug,                               \
 950           "Zap freed resource/arena space with 0xABABABAB")                 \
 951                                                                             \
 952   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 953           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 954                                                                             \
 955   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 956           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 957                                                                             \
 958   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 959           "Zap allocated/freed stack segments with 0xFADFADED")             \
 960                                                                             \
 961   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 962           "Zap unused heap space with 0xBAADBABE")                          \
 963                                                                             \
 964   develop(bool, TraceZapUnusedHeapArea, false,                              \
 965           "Trace zapping of unused heap space")                             \
 966                                                                             \
 967   develop(bool, CheckZapUnusedHeapArea, false,                              \
 968           "Check zapping of unused heap space")                             \
 969                                                                             \
 970   develop(bool, ZapFillerObjects, trueInDebug,                              \
 971           "Zap filler objects with 0xDEAFBABE")                             \
 972                                                                             \
 973   develop(bool, PrintVMMessages, true,                                      \
 974           "Print VM messages on console")                                   \
 975                                                                             \
 976   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 977           "Print the time the application has been running")                \
 978                                                                             \
 979   product(bool, PrintGCApplicationStoppedTime, false,                       \
 980           "Print the time the application has been stopped")                \
 981                                                                             \
 982   diagnostic(bool, VerboseVerification, false,                              \
 983           "Display detailed verification details")                          \
 984                                                                             \
 985   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 986           "If > 0, provokes an error after VM initialization; the value "   \
 987           "determines which error to provoke. See test_error_handler() "    \
 988           "in debug.cpp.")                                                  \
 989                                                                             \
 990   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
 991           "If > 0, provokes an error inside VM error handler (a secondary " \
 992           "crash). see test_error_handler() in debug.cpp.")                 \
 993                                                                             \
 994   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
 995           "If true, tests SafeFetch inside error handler.")                 \
 996                                                                             \
 997   develop(bool, Verbose, false,                                             \
 998           "Print additional debugging information from other modes")        \
 999                                                                             \
1000   develop(bool, PrintMiscellaneous, false,                                  \
1001           "Print uncategorized debugging information (requires +Verbose)")  \
1002                                                                             \
1003   develop(bool, WizardMode, false,                                          \
1004           "Print much more debugging information")                          \
1005                                                                             \
1006   product(bool, ShowMessageBoxOnError, false,                               \
1007           "Keep process alive on VM fatal error")                           \
1008                                                                             \
1009   product(bool, CreateCoredumpOnCrash, true,                                \
1010           "Create core/mini dump on VM fatal error")                        \
1011                                                                             \
1012   product(uintx, ErrorLogTimeout, 2 * 60,                                   \
1013           "Timeout, in seconds, to limit the time spent on writing an "     \
1014           "error log in case of a crash.")                                  \
1015                                                                             \
1016   product_pd(bool, UseOSErrorReporting,                                     \
1017           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
1018                                                                             \
1019   product(bool, SuppressFatalErrorMessage, false,                           \
1020           "Report NO fatal error message (avoid deadlock)")                 \
1021                                                                             \
1022   product(ccstrlist, OnError, "",                                           \
1023           "Run user-defined commands on fatal error; see VMError.cpp "      \
1024           "for examples")                                                   \
1025                                                                             \
1026   product(ccstrlist, OnOutOfMemoryError, "",                                \
1027           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
1028                                                                             \
1029   manageable(bool, HeapDumpBeforeFullGC, false,                             \
1030           "Dump heap to file before any major stop-the-world GC")           \
1031                                                                             \
1032   manageable(bool, HeapDumpAfterFullGC, false,                              \
1033           "Dump heap to file after any major stop-the-world GC")            \
1034                                                                             \
1035   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
1036           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
1037                                                                             \
1038   manageable(ccstr, HeapDumpPath, NULL,                                     \
1039           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
1040           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
1041           "in the working directory)")                                      \
1042                                                                             \
1043   develop(size_t, SegmentedHeapDumpThreshold, 2*G,                          \
1044           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
1045           "when the heap usage is larger than this")                        \
1046                                                                             \
1047   develop(size_t, HeapDumpSegmentSize, 1*G,                                 \
1048           "Approximate segment size when generating a segmented heap dump") \
1049                                                                             \
1050   develop(bool, BreakAtWarning, false,                                      \
1051           "Execute breakpoint upon encountering VM warning")                \
1052                                                                             \
1053   develop(bool, TraceVMOperation, false,                                    \
1054           "Trace VM operations")                                            \
1055                                                                             \
1056   develop(bool, UseFakeTimers, false,                                       \
1057           "Tell whether the VM should use system time or a fake timer")     \
1058                                                                             \
1059   product(ccstr, NativeMemoryTracking, "off",                               \
1060           "Native memory tracking options")                                 \
1061                                                                             \
1062   diagnostic(bool, PrintNMTStatistics, false,                               \
1063           "Print native memory tracking summary data if it is on")          \
1064                                                                             \
1065   diagnostic(bool, LogCompilation, false,                                   \
1066           "Log compilation activity in detail to LogFile")                  \
1067                                                                             \
1068   product(bool, PrintCompilation, false,                                    \
1069           "Print compilations")                                             \
1070                                                                             \
1071   diagnostic(bool, TraceNMethodInstalls, false,                             \
1072           "Trace nmethod installation")                                     \
1073                                                                             \
1074   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1075           "0: do not allow scavengable oops in the code cache; "            \
1076           "1: allow scavenging from the code cache; "                       \
1077           "2: emit as many constants as the compiler can see")              \
1078           range(0, 2)                                                       \
1079                                                                             \
1080   product(bool, AlwaysRestoreFPU, false,                                    \
1081           "Restore the FPU control word after every JNI call (expensive)")  \
1082                                                                             \
1083   diagnostic(bool, PrintCompilation2, false,                                \
1084           "Print additional statistics per compilation")                    \
1085                                                                             \
1086   diagnostic(bool, PrintAdapterHandlers, false,                             \
1087           "Print code generated for i2c/c2i adapters")                      \
1088                                                                             \
1089   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1090           "Verify that i2c/c2i adapters are called properly")               \
1091                                                                             \
1092   develop(bool, VerifyAdapterSharing, false,                                \
1093           "Verify that the code for shared adapters is the equivalent")     \
1094                                                                             \
1095   diagnostic(bool, PrintAssembly, false,                                    \
1096           "Print assembly code (using external disassembler.so)")           \
1097                                                                             \
1098   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1099           "Print options string passed to disassembler.so")                 \
1100                                                                             \
1101   diagnostic(bool, PrintNMethods, false,                                    \
1102           "Print assembly code for nmethods when generated")                \
1103                                                                             \
1104   diagnostic(bool, PrintNativeNMethods, false,                              \
1105           "Print assembly code for native nmethods when generated")         \
1106                                                                             \
1107   develop(bool, PrintDebugInfo, false,                                      \
1108           "Print debug information for all nmethods when generated")        \
1109                                                                             \
1110   develop(bool, PrintRelocations, false,                                    \
1111           "Print relocation information for all nmethods when generated")   \
1112                                                                             \
1113   develop(bool, PrintDependencies, false,                                   \
1114           "Print dependency information for all nmethods when generated")   \
1115                                                                             \
1116   develop(bool, PrintExceptionHandlers, false,                              \
1117           "Print exception handler tables for all nmethods when generated") \
1118                                                                             \
1119   develop(bool, StressCompiledExceptionHandlers, false,                     \
1120           "Exercise compiled exception handlers")                           \
1121                                                                             \
1122   develop(bool, InterceptOSException, false,                                \
1123           "Start debugger when an implicit OS (e.g. NULL) "                 \
1124           "exception happens")                                              \
1125                                                                             \
1126   product(bool, PrintCodeCache, false,                                      \
1127           "Print the code cache memory usage when exiting")                 \
1128                                                                             \
1129   develop(bool, PrintCodeCache2, false,                                     \
1130           "Print detailed usage information on the code cache when exiting")\
1131                                                                             \
1132   product(bool, PrintCodeCacheOnCompilation, false,                         \
1133           "Print the code cache memory usage each time a method is "        \
1134           "compiled")                                                       \
1135                                                                             \
1136   diagnostic(bool, PrintStubCode, false,                                    \
1137           "Print generated stub code")                                      \
1138                                                                             \
1139   product(bool, StackTraceInThrowable, true,                                \
1140           "Collect backtrace in throwable when exception happens")          \
1141                                                                             \
1142   product(bool, OmitStackTraceInFastThrow, true,                            \
1143           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1144                                                                             \
1145   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1146           "Print bytecode statistics when dumping profiler output")         \
1147                                                                             \
1148   product(bool, ProfilerRecordPC, false,                                    \
1149           "Collect ticks for each 16 byte interval of compiled code")       \
1150                                                                             \
1151   product(bool, ProfileVM, false,                                           \
1152           "Profile ticks that fall within VM (either in the VM Thread "     \
1153           "or VM code called through stubs)")                               \
1154                                                                             \
1155   product(bool, ProfileIntervals, false,                                    \
1156           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1157                                                                             \
1158   notproduct(bool, ProfilerCheckIntervals, false,                           \
1159           "Collect and print information on spacing of profiler ticks")     \
1160                                                                             \
1161   product(bool, PrintWarnings, true,                                        \
1162           "Print JVM warnings to output stream")                            \
1163                                                                             \
1164   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1165           "Print warnings for stalled SpinLocks")                           \
1166                                                                             \
1167   product(bool, RegisterFinalizersAtInit, true,                             \
1168           "Register finalizable objects at end of Object.<init> or "        \
1169           "after allocation")                                               \
1170                                                                             \
1171   develop(bool, RegisterReferences, true,                                   \
1172           "Tell whether the VM should register soft/weak/final/phantom "    \
1173           "references")                                                     \
1174                                                                             \
1175   develop(bool, IgnoreRewrites, false,                                      \
1176           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1177           "This is unsafe!")                                                \
1178                                                                             \
1179   develop(bool, PrintCodeCacheExtension, false,                             \
1180           "Print extension of code cache")                                  \
1181                                                                             \
1182   develop(bool, UsePrivilegedStack, true,                                   \
1183           "Enable the security JVM functions")                              \
1184                                                                             \
1185   develop(bool, ProtectionDomainVerification, true,                         \
1186           "Verify protection domain before resolution in system dictionary")\
1187                                                                             \
1188   product(bool, ClassUnloading, true,                                       \
1189           "Do unloading of classes")                                        \
1190                                                                             \
1191   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1192           "Do unloading of classes with a concurrent marking cycle")        \
1193                                                                             \
1194   develop(bool, DisableStartThread, false,                                  \
1195           "Disable starting of additional Java threads "                    \
1196           "(for debugging only)")                                           \
1197                                                                             \
1198   develop(bool, MemProfiling, false,                                        \
1199           "Write memory usage profiling to log file")                       \
1200                                                                             \
1201   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1202           "Print the system dictionary at exit")                            \
1203                                                                             \
1204   experimental(intx, PredictedLoadedClassCount, 0,                          \
1205           "Experimental: Tune loaded class cache starting size")            \
1206                                                                             \
1207   diagnostic(bool, UnsyncloadClass, false,                                  \
1208           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1209           "class loader must call VM synchronized for findClass "           \
1210           "and defineClass.")                                               \
1211                                                                             \
1212   product(bool, AlwaysLockClassLoader, false,                               \
1213           "Require the VM to acquire the class loader lock before calling " \
1214           "loadClass() even for class loaders registering "                 \
1215           "as parallel capable")                                            \
1216                                                                             \
1217   product(bool, AllowParallelDefineClass, false,                            \
1218           "Allow parallel defineClass requests for class loaders "          \
1219           "registering as parallel capable")                                \
1220                                                                             \
1221   product(bool, MustCallLoadClassInternal, false,                           \
1222           "Call loadClassInternal() rather than loadClass()")               \
1223                                                                             \
1224   product_pd(bool, DontYieldALot,                                           \
1225           "Throw away obvious excess yield calls")                          \
1226                                                                             \
1227   product_pd(bool, ConvertSleepToYield,                                     \
1228           "Convert sleep(0) to thread yield "                               \
1229           "(may be off for Solaris to improve GUI)")                        \
1230                                                                             \
1231   product(bool, ConvertYieldToSleep, false,                                 \
1232           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1233           "behavior")                                                       \
1234                                                                             \
1235   develop(bool, UseDetachedThreads, true,                                   \
1236           "Use detached threads that are recycled upon termination "        \
1237           "(for Solaris only)")                                             \
1238                                                                             \
1239   product(bool, UseLWPSynchronization, true,                                \
1240           "Use LWP-based instead of libthread-based synchronization "       \
1241           "(SPARC only)")                                                   \
1242                                                                             \
1243   experimental(ccstr, SyncKnobs, NULL,                                      \
1244                "(Unstable) Various monitor synchronization tunables")       \
1245                                                                             \
1246   experimental(intx, EmitSync, 0,                                           \
1247                "(Unsafe, Unstable) "                                        \
1248                "Control emission of inline sync fast-path code")            \
1249                                                                             \
1250   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1251                                                                             \
1252   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1253                                                                             \
1254   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1255                "Experimental Sync flags")                                   \
1256                                                                             \
1257   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1258                                                                             \
1259   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1260                                                                             \
1261   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1262                                                                             \
1263   experimental(intx, hashCode, 5,                                           \
1264                "(Unstable) select hashCode generation algorithm")           \
1265                                                                             \
1266   experimental(intx, WorkAroundNPTLTimedWaitHang, 0,                        \
1267                "(Unstable, Linux-specific) "                                \
1268                "avoid NPTL-FUTEX hang pthread_cond_timedwait")              \
1269                                                                             \
1270   product(bool, FilterSpuriousWakeups, true,                                \
1271           "When true prevents OS-level spurious, or premature, wakeups "    \
1272           "from Object.wait (Ignored for Windows)")                         \
1273                                                                             \
1274   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1275                                                                             \
1276   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1277                                                                             \
1278   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1279                                                                             \
1280   develop(bool, UsePthreads, false,                                         \
1281           "Use pthread-based instead of libthread-based synchronization "   \
1282           "(SPARC only)")                                                   \
1283                                                                             \
1284   product(bool, ReduceSignalUsage, false,                                   \
1285           "Reduce the use of OS signals in Java and/or the VM")             \
1286                                                                             \
1287   develop_pd(bool, ShareVtableStubs,                                        \
1288           "Share vtable stubs (smaller code but worse branch prediction")   \
1289                                                                             \
1290   develop(bool, LoadLineNumberTables, true,                                 \
1291           "Tell whether the class file parser loads line number tables")    \
1292                                                                             \
1293   develop(bool, LoadLocalVariableTables, true,                              \
1294           "Tell whether the class file parser loads local variable tables") \
1295                                                                             \
1296   develop(bool, LoadLocalVariableTypeTables, true,                          \
1297           "Tell whether the class file parser loads local variable type"    \
1298           "tables")                                                         \
1299                                                                             \
1300   product(bool, AllowUserSignalHandlers, false,                             \
1301           "Do not complain if the application installs signal handlers "    \
1302           "(Solaris & Linux only)")                                         \
1303                                                                             \
1304   product(bool, UseSignalChaining, true,                                    \
1305           "Use signal-chaining to invoke signal handlers installed "        \
1306           "by the application (Solaris & Linux only)")                      \
1307                                                                             \
1308   product(bool, UseAltSigs, false,                                          \
1309           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1310           "internal signals (Solaris only)")                                \
1311                                                                             \
1312   product(bool, AllowJNIEnvProxy, false,                                    \
1313           "Allow JNIEnv proxies for jdbx")                                  \
1314                                                                             \
1315   product(bool, JNIDetachReleasesMonitors, true,                            \
1316           "JNI DetachCurrentThread releases monitors owned by thread")      \
1317                                                                             \
1318   product(bool, RestoreMXCSROnJNICalls, false,                              \
1319           "Restore MXCSR when returning from JNI calls")                    \
1320                                                                             \
1321   product(bool, CheckJNICalls, false,                                       \
1322           "Verify all arguments to JNI calls")                              \
1323                                                                             \
1324   product(bool, CheckEndorsedAndExtDirs, false,                             \
1325           "Verify the endorsed and extension directories are not used")     \
1326                                                                             \
1327   product(bool, UseFastJNIAccessors, true,                                  \
1328           "Use optimized versions of Get<Primitive>Field")                  \
1329                                                                             \
1330   product(intx, MaxJNILocalCapacity, 65536,                                 \
1331           "Maximum allowable local JNI handle capacity to "                 \
1332           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1333           "where <= 0 is unlimited, default: 65536")                        \
1334                                                                             \
1335   product(bool, EagerXrunInit, false,                                       \
1336           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1337           "but not all -Xrun libraries may support the state of the VM "    \
1338           "at this time")                                                   \
1339                                                                             \
1340   product(bool, PreserveAllAnnotations, false,                              \
1341           "Preserve RuntimeInvisibleAnnotations as well "                   \
1342           "as RuntimeVisibleAnnotations")                                   \
1343                                                                             \
1344   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1345           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1346                                                                             \
1347   product(bool, UseXMMForArrayCopy, false,                                  \
1348           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1349                                                                             \
1350   product(intx, FieldsAllocationStyle, 1,                                   \
1351           "0 - type based with oops first, "                                \
1352           "1 - with oops last, "                                            \
1353           "2 - oops in super and sub classes are together")                 \
1354           range(0, 2)                                                       \
1355                                                                             \
1356   product(bool, CompactFields, true,                                        \
1357           "Allocate nonstatic fields in gaps between previous fields")      \
1358                                                                             \
1359   notproduct(bool, PrintFieldLayout, false,                                 \
1360           "Print field layout for each class")                              \
1361                                                                             \
1362   /* Need to limit the extent of the padding to reasonable size.          */\
1363   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1364   /* aggressive prefetching, while still leaving the room for segregating */\
1365   /* among the distinct pages.                                            */\
1366   product(intx, ContendedPaddingWidth, 128,                                 \
1367           "How many bytes to pad the fields/classes marked @Contended with")\
1368           range(0, 8192)                                                    \
1369           constraint(ContendedPaddingWidthConstraintFunc,AtParse)           \
1370                                                                             \
1371   product(bool, EnableContended, true,                                      \
1372           "Enable @Contended annotation support")                           \
1373                                                                             \
1374   product(bool, RestrictContended, true,                                    \
1375           "Restrict @Contended to trusted classes")                         \
1376                                                                             \
1377   product(bool, UseBiasedLocking, true,                                     \
1378           "Enable biased locking in JVM")                                   \
1379                                                                             \
1380   product(intx, BiasedLockingStartupDelay, 4000,                            \
1381           "Number of milliseconds to wait before enabling biased locking")  \
1382                                                                             \
1383   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1384           "Print statistics of biased locking in JVM")                      \
1385                                                                             \
1386   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1387           "Threshold of number of revocations per type to try to "          \
1388           "rebias all objects in the heap of that type")                    \
1389                                                                             \
1390   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1391           "Threshold of number of revocations per type to permanently "     \
1392           "revoke biases of all objects in the heap of that type")          \
1393                                                                             \
1394   product(intx, BiasedLockingDecayTime, 25000,                              \
1395           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1396           "type after previous bulk rebias")                                \
1397                                                                             \
1398   /* tracing */                                                             \
1399                                                                             \
1400   notproduct(bool, TraceRuntimeCalls, false,                                \
1401           "Trace run-time calls")                                           \
1402                                                                             \
1403   develop(bool, TraceJNICalls, false,                                       \
1404           "Trace JNI calls")                                                \
1405                                                                             \
1406   develop(bool, StressRewriter, false,                                      \
1407           "Stress linktime bytecode rewriting")                             \
1408                                                                             \
1409   notproduct(bool, TraceJVMCalls, false,                                    \
1410           "Trace JVM calls")                                                \
1411                                                                             \
1412   product(ccstr, TraceJVMTI, NULL,                                          \
1413           "Trace flags for JVMTI functions and events")                     \
1414                                                                             \
1415   /* This option can change an EMCP method into an obsolete method. */      \
1416   /* This can affect tests that except specific methods to be EMCP. */      \
1417   /* This option should be used with caution.                       */      \
1418   product(bool, StressLdcRewrite, false,                                    \
1419           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1420                                                                             \
1421   product(intx, TraceRedefineClasses, 0,                                    \
1422           "Trace level for JVMTI RedefineClasses")                          \
1423                                                                             \
1424   /* change to false by default sometime after Mustang */                   \
1425   product(bool, VerifyMergedCPBytecodes, true,                              \
1426           "Verify bytecodes after RedefineClasses constant pool merging")   \
1427                                                                             \
1428   develop(bool, TraceJNIHandleAllocation, false,                            \
1429           "Trace allocation/deallocation of JNI handle blocks")             \
1430                                                                             \
1431   develop(bool, TraceBytecodes, false,                                      \
1432           "Trace bytecode execution")                                       \
1433                                                                             \
1434   develop(bool, TraceClassInitialization, false,                            \
1435           "Trace class initialization")                                     \
1436                                                                             \
1437   product(bool, TraceExceptions, false,                                     \
1438           "Trace exceptions")                                               \
1439                                                                             \
1440   develop(bool, TraceICs, false,                                            \
1441           "Trace inline cache changes")                                     \
1442                                                                             \
1443   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1444           "Trace method invocation counter overflow")                       \
1445                                                                             \
1446   develop(bool, TraceInlineCacheClearing, false,                            \
1447           "Trace clearing of inline caches in nmethods")                    \
1448                                                                             \
1449   develop(bool, TraceDependencies, false,                                   \
1450           "Trace dependencies")                                             \
1451                                                                             \
1452   develop(bool, VerifyDependencies, trueInDebug,                            \
1453           "Exercise and verify the compilation dependency mechanism")       \
1454                                                                             \
1455   develop(bool, TraceNewOopMapGeneration, false,                            \
1456           "Trace OopMapGeneration")                                         \
1457                                                                             \
1458   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1459           "Trace OopMapGeneration: print detailed cell states")             \
1460                                                                             \
1461   develop(bool, TimeOopMap, false,                                          \
1462           "Time calls to GenerateOopMap::compute_map() in sum")             \
1463                                                                             \
1464   develop(bool, TimeOopMap2, false,                                         \
1465           "Time calls to GenerateOopMap::compute_map() individually")       \
1466                                                                             \
1467   develop(bool, TraceMonitorMismatch, false,                                \
1468           "Trace monitor matching failures during OopMapGeneration")        \
1469                                                                             \
1470   develop(bool, TraceOopMapRewrites, false,                                 \
1471           "Trace rewriting of method oops during oop map generation")       \
1472                                                                             \
1473   develop(bool, TraceSafepoint, false,                                      \
1474           "Trace safepoint operations")                                     \
1475                                                                             \
1476   develop(bool, TraceICBuffer, false,                                       \
1477           "Trace usage of IC buffer")                                       \
1478                                                                             \
1479   develop(bool, TraceCompiledIC, false,                                     \
1480           "Trace changes of compiled IC")                                   \
1481                                                                             \
1482   develop(bool, TraceStartupTime, false,                                    \
1483           "Trace setup time")                                               \
1484                                                                             \
1485   develop(bool, TraceProtectionDomainVerification, false,                   \
1486           "Trace protection domain verification")                           \
1487                                                                             \
1488   develop(bool, TraceClearedExceptions, false,                              \
1489           "Print when an exception is forcibly cleared")                    \
1490                                                                             \
1491   product(bool, TraceClassResolution, false,                                \
1492           "Trace all constant pool resolutions (for debugging)")            \
1493                                                                             \
1494   product(bool, TraceBiasedLocking, false,                                  \
1495           "Trace biased locking in JVM")                                    \
1496                                                                             \
1497   product(bool, TraceMonitorInflation, false,                               \
1498           "Trace monitor inflation in JVM")                                 \
1499                                                                             \
1500   /* gc */                                                                  \
1501                                                                             \
1502   product(bool, UseSerialGC, false,                                         \
1503           "Use the Serial garbage collector")                               \
1504                                                                             \
1505   product(bool, UseG1GC, false,                                             \
1506           "Use the Garbage-First garbage collector")                        \
1507                                                                             \
1508   product(bool, UseParallelGC, false,                                       \
1509           "Use the Parallel Scavenge garbage collector")                    \
1510                                                                             \
1511   product(bool, UseParallelOldGC, false,                                    \
1512           "Use the Parallel Old garbage collector")                         \
1513                                                                             \
1514   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1515           "How often should we maximally compact the heap (not allowing "   \
1516           "any dead space)")                                                \
1517                                                                             \
1518   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1519           "The collection count for the first maximum compaction")          \
1520                                                                             \
1521   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1522           "Use maximum compaction in the Parallel Old garbage collector "   \
1523           "for a system GC")                                                \
1524                                                                             \
1525   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1526           "The mean used by the parallel compact dead wood "                \
1527           "limiter (a number between 0-100)")                               \
1528           range(0, 100)                                                     \
1529                                                                             \
1530   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1531           "The standard deviation used by the parallel compact dead wood "  \
1532           "limiter (a number between 0-100)")                               \
1533           range(0, 100)                                                     \
1534                                                                             \
1535   product(uint, ParallelGCThreads, 0,                                       \
1536           "Number of parallel threads parallel gc will use")                \
1537                                                                             \
1538   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1539             "Use semaphore synchronization for the GC Threads, "            \
1540             "instead of synchronization based on mutexes")                  \
1541                                                                             \
1542   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1543           "Dynamically choose the number of parallel threads "              \
1544           "parallel gc will use")                                           \
1545                                                                             \
1546   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1547           "Force dynamic selection of the number of "                       \
1548           "parallel threads parallel gc will use to aid debugging")         \
1549                                                                             \
1550   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1551           "Size of heap (bytes) per GC thread used in calculating the "     \
1552           "number of GC threads")                                           \
1553           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1554                                                                             \
1555   product(bool, TraceDynamicGCThreads, false,                               \
1556           "Trace the dynamic GC thread usage")                              \
1557                                                                             \
1558   develop(bool, ParallelOldGCSplitALot, false,                              \
1559           "Provoke splitting (copying data from a young gen space to "      \
1560           "multiple destination spaces)")                                   \
1561                                                                             \
1562   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1563           "How often to provoke splitting a young gen space")               \
1564           range(0, max_uintx)                                               \
1565                                                                             \
1566   product(uint, ConcGCThreads, 0,                                           \
1567           "Number of threads concurrent gc will use")                       \
1568                                                                             \
1569   product(size_t, YoungPLABSize, 4096,                                      \
1570           "Size of young gen promotion LAB's (in HeapWords)")               \
1571           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
1572                                                                             \
1573   product(size_t, OldPLABSize, 1024,                                        \
1574           "Size of old gen promotion LAB's (in HeapWords), or Number        \
1575           of blocks to attempt to claim when refilling CMS LAB's")          \
1576                                                                             \
1577   product(uintx, GCTaskTimeStampEntries, 200,                               \
1578           "Number of time stamp entries per gc worker thread")              \
1579           range(1, max_uintx)                                               \
1580                                                                             \
1581   product(bool, AlwaysTenure, false,                                        \
1582           "Always tenure objects in eden (ParallelGC only)")                \
1583                                                                             \
1584   product(bool, NeverTenure, false,                                         \
1585           "Never tenure objects in eden, may tenure on overflow "           \
1586           "(ParallelGC only)")                                              \
1587                                                                             \
1588   product(bool, ScavengeBeforeFullGC, true,                                 \
1589           "Scavenge young generation before each full GC.")                 \
1590                                                                             \
1591   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1592           "Allow scavenges to occur when to-space contains objects")        \
1593                                                                             \
1594   product(bool, UseConcMarkSweepGC, false,                                  \
1595           "Use Concurrent Mark-Sweep GC in the old generation")             \
1596                                                                             \
1597   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1598           "A System.gc() request invokes a concurrent collection; "         \
1599           "(effective only when using concurrent collectors)")              \
1600                                                                             \
1601   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1602           "A System.gc() request invokes a concurrent collection and "      \
1603           "also unloads classes during such a concurrent gc cycle "         \
1604           "(effective only when UseConcMarkSweepGC)")                       \
1605                                                                             \
1606   product(bool, GCLockerInvokesConcurrent, false,                           \
1607           "The exit of a JNI critical section necessitating a scavenge, "   \
1608           "also kicks off a background concurrent collection")              \
1609                                                                             \
1610   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1611           "How much the GC can expand the eden by while the GC locker "     \
1612           "is active (as a percentage)")                                    \
1613           range(0, 100)                                                     \
1614                                                                             \
1615   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1616           "Number of times to retry allocations when "                      \
1617           "blocked by the GC locker")                                       \
1618                                                                             \
1619   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1620           "Use adaptive free lists in the CMS generation")                  \
1621                                                                             \
1622   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1623           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1624                                                                             \
1625   product(bool, UseCMSBestFit, true,                                        \
1626           "Use CMS best fit allocation strategy")                           \
1627                                                                             \
1628   product(bool, UseParNewGC, false,                                         \
1629           "Use parallel threads in the new generation")                     \
1630                                                                             \
1631   product(bool, PrintTaskqueue, false,                                      \
1632           "Print taskqueue statistics for parallel collectors")             \
1633                                                                             \
1634   product(bool, PrintTerminationStats, false,                               \
1635           "Print termination statistics for parallel collectors")           \
1636                                                                             \
1637   product(uintx, ParallelGCBufferWastePct, 10,                              \
1638           "Wasted fraction of parallel allocation buffer")                  \
1639           range(0, 100)                                                     \
1640                                                                             \
1641   product(uintx, TargetPLABWastePct, 10,                                    \
1642           "Target wasted space in last buffer as percent of overall "       \
1643           "allocation")                                                     \
1644           range(1, 100)                                                     \
1645                                                                             \
1646   product(uintx, PLABWeight, 75,                                            \
1647           "Percentage (0-100) used to weight the current sample when "      \
1648           "computing exponentially decaying average for ResizePLAB")        \
1649           range(0, 100)                                                     \
1650                                                                             \
1651   product(bool, ResizePLAB, true,                                           \
1652           "Dynamically resize (survivor space) promotion LAB's")            \
1653                                                                             \
1654   product(bool, PrintPLAB, false,                                           \
1655           "Print (survivor space) promotion LAB's sizing decisions")        \
1656                                                                             \
1657   product(intx, ParGCArrayScanChunk, 50,                                    \
1658           "Scan a subset of object array and push remainder, if array is "  \
1659           "bigger than this")                                               \
1660           range(1, max_intx)                                                \
1661                                                                             \
1662   product(bool, ParGCUseLocalOverflow, false,                               \
1663           "Instead of a global overflow list, use local overflow stacks")   \
1664                                                                             \
1665   product(bool, ParGCTrimOverflow, true,                                    \
1666           "Eagerly trim the local overflow lists "                          \
1667           "(when ParGCUseLocalOverflow)")                                   \
1668                                                                             \
1669   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1670           "Simulate work queue overflow in ParNew")                         \
1671                                                                             \
1672   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1673           "An `interval' counter that determines how frequently "           \
1674           "we simulate overflow; a smaller number increases frequency")     \
1675                                                                             \
1676   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1677           "The desired number of objects to claim from the overflow list")  \
1678                                                                             \
1679   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1680           "The number of strides per worker thread that we divide up the "  \
1681           "card table scanning work into")                                  \
1682           range(1, max_uintx)                                               \
1683                                                                             \
1684   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1685           "The number of cards in each chunk of the parallel chunks used "  \
1686           "during card table scanning")                                     \
1687           range(1, max_intx)                                                \
1688                                                                             \
1689   product(uintx, OldPLABWeight, 50,                                         \
1690           "Percentage (0-100) used to weight the current sample when "      \
1691           "computing exponentially decaying average for resizing "          \
1692           "OldPLABSize")                                                    \
1693           range(0, 100)                                                     \
1694                                                                             \
1695   product(bool, ResizeOldPLAB, true,                                        \
1696           "Dynamically resize (old gen) promotion LAB's")                   \
1697                                                                             \
1698   product(bool, PrintOldPLAB, false,                                        \
1699           "Print (old gen) promotion LAB's sizing decisions")               \
1700                                                                             \
1701   product(size_t, CMSOldPLABMax, 1024,                                      \
1702           "Maximum size of CMS gen promotion LAB caches per worker "        \
1703           "per block size")                                                 \
1704           range(1, max_uintx)                                               \
1705                                                                             \
1706   product(size_t, CMSOldPLABMin, 16,                                        \
1707           "Minimum size of CMS gen promotion LAB caches per worker "        \
1708           "per block size")                                                 \
1709           range(1, max_uintx)                                               \
1710           constraint(CMSOldPLABMinConstraintFunc,AfterErgo)                 \
1711                                                                             \
1712   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1713           "Nominal number of refills of CMS gen promotion LAB cache "       \
1714           "per worker per block size")                                      \
1715           range(1, max_uintx)                                               \
1716                                                                             \
1717   product(bool, CMSOldPLABResizeQuicker, false,                             \
1718           "React on-the-fly during a scavenge to a sudden "                 \
1719           "change in block demand rate")                                    \
1720                                                                             \
1721   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1722           "The tolerance of the phase-change detector for on-the-fly "      \
1723           "PLAB resizing during a scavenge")                                \
1724           range(1, max_uintx)                                               \
1725                                                                             \
1726   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1727           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1728           "during a scavenge")                                              \
1729                                                                             \
1730   product(bool, AlwaysPreTouch, false,                                      \
1731           "Force all freshly committed pages to be pre-touched")            \
1732                                                                             \
1733   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1734           "The maximum size of young gen chosen by default per GC worker "  \
1735           "thread available")                                               \
1736           range(1, max_uintx)                                               \
1737                                                                             \
1738   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1739           "Percentage (0-100) used to add conservatism when computing the " \
1740           "duty cycle")                                                     \
1741           range(0, 100)                                                     \
1742                                                                             \
1743   product(uintx, CMSExpAvgFactor, 50,                                       \
1744           "Percentage (0-100) used to weight the current sample when "      \
1745           "computing exponential averages for CMS statistics")              \
1746           range(0, 100)                                                     \
1747                                                                             \
1748   product(uintx, CMS_FLSWeight, 75,                                         \
1749           "Percentage (0-100) used to weight the current sample when "      \
1750           "computing exponentially decaying averages for CMS FLS "          \
1751           "statistics")                                                     \
1752           range(0, 100)                                                     \
1753                                                                             \
1754   product(uintx, CMS_FLSPadding, 1,                                         \
1755           "The multiple of deviation from mean to use for buffering "       \
1756           "against volatility in free list demand")                         \
1757                                                                             \
1758   product(uintx, FLSCoalescePolicy, 2,                                      \
1759           "CMS: aggressiveness level for coalescing, increasing "           \
1760           "from 0 to 4")                                                    \
1761           range(0, 4)                                                       \
1762                                                                             \
1763   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1764           "CMS: larger free blocks are always available for coalescing")    \
1765                                                                             \
1766   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1767           "CMS: the smaller the percentage the greater the coalescing "     \
1768           "force")                                                          \
1769                                                                             \
1770   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1771           "CMS: the factor by which to inflate estimated demand of small "  \
1772           "block sizes to prevent coalescing with an adjoining block")      \
1773                                                                             \
1774   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1775           "CMS: the factor by which to inflate estimated demand of large "  \
1776           "block sizes to prevent coalescing with an adjoining block")      \
1777                                                                             \
1778   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1779           "CMS: the factor by which to inflate estimated demand of small "  \
1780           "block sizes to prevent splitting to supply demand for smaller "  \
1781           "blocks")                                                         \
1782                                                                             \
1783   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1784           "CMS: the factor by which to inflate estimated demand of large "  \
1785           "block sizes to prevent splitting to supply demand for smaller "  \
1786           "blocks")                                                         \
1787                                                                             \
1788   product(bool, CMSExtrapolateSweep, false,                                 \
1789           "CMS: cushion for block demand during sweep")                     \
1790                                                                             \
1791   product(uintx, CMS_SweepWeight, 75,                                       \
1792           "Percentage (0-100) used to weight the current sample when "      \
1793           "computing exponentially decaying average for inter-sweep "       \
1794           "duration")                                                       \
1795           range(0, 100)                                                     \
1796                                                                             \
1797   product(uintx, CMS_SweepPadding, 1,                                       \
1798           "The multiple of deviation from mean to use for buffering "       \
1799           "against volatility in inter-sweep duration")                     \
1800                                                                             \
1801   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1802           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1803           "duration exceeds this threshold in milliseconds")                \
1804                                                                             \
1805   product(bool, CMSClassUnloadingEnabled, true,                             \
1806           "Whether class unloading enabled when using CMS GC")              \
1807                                                                             \
1808   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1809           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1810           "count for which classes may not be unloaded")                    \
1811                                                                             \
1812   develop(intx, CMSDictionaryChoice, 0,                                     \
1813           "Use BinaryTreeDictionary as default in the CMS generation")      \
1814                                                                             \
1815   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1816           "Replenish an indexed free list with this number of chunks")      \
1817                                                                             \
1818   product(bool, CMSReplenishIntermediate, true,                             \
1819           "Replenish all intermediate free-list caches")                    \
1820                                                                             \
1821   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1822           "When satisfying batched demand, split blocks from the "          \
1823           "IndexedFreeList whose size is a multiple of requested size")     \
1824                                                                             \
1825   product(bool, CMSLoopWarn, false,                                         \
1826           "Warn in case of excessive CMS looping")                          \
1827                                                                             \
1828   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1829           "Restore preserved marks early")                                  \
1830                                                                             \
1831   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1832           "Size of marking stack")                                          \
1833                                                                             \
1834   /* where does the range max value of (max_jint - 1) come from? */         \
1835   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1836           "Maximum size of marking stack")                                  \
1837           range(1, (max_jint - 1))                                          \
1838                                                                             \
1839   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1840           "Simulate frequent marking stack / work queue overflow")          \
1841                                                                             \
1842   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1843           "An \"interval\" counter that determines how frequently "         \
1844           "to simulate overflow; a smaller number increases frequency")     \
1845                                                                             \
1846   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1847           "Maximum number of abortable preclean iterations, if > 0")        \
1848                                                                             \
1849   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1850           "Maximum time in abortable preclean (in milliseconds)")           \
1851                                                                             \
1852   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1853           "Nominal minimum work per abortable preclean iteration")          \
1854                                                                             \
1855   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1856           "Time that we sleep between iterations when not given "           \
1857           "enough work per iteration")                                      \
1858                                                                             \
1859   product(size_t, CMSRescanMultiple, 32,                                    \
1860           "Size (in cards) of CMS parallel rescan task")                    \
1861           range(1, max_uintx)                                               \
1862                                                                             \
1863   product(size_t, CMSConcMarkMultiple, 32,                                  \
1864           "Size (in cards) of CMS concurrent MT marking task")              \
1865           range(1, max_uintx)                                               \
1866                                                                             \
1867   product(bool, CMSAbortSemantics, false,                                   \
1868           "Whether abort-on-overflow semantics is implemented")             \
1869                                                                             \
1870   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1871           "Use the parallel initial mark.")                                 \
1872                                                                             \
1873   product(bool, CMSParallelRemarkEnabled, true,                             \
1874           "Whether parallel remark enabled (only if ParNewGC)")             \
1875                                                                             \
1876   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1877           "Whether parallel remark of survivor space "                      \
1878           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1879                                                                             \
1880   product(bool, CMSPLABRecordAlways, true,                                  \
1881           "Always record survivor space PLAB boundaries (effective only "   \
1882           "if CMSParallelSurvivorRemarkEnabled)")                           \
1883                                                                             \
1884   product(bool, CMSEdenChunksRecordAlways, true,                            \
1885           "Always record eden chunks used for the parallel initial mark "   \
1886           "or remark of eden")                                              \
1887                                                                             \
1888   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1889           "Print the eden and the survivor chunks used for the parallel "   \
1890           "initial mark or remark of the eden/survivor spaces")             \
1891                                                                             \
1892   product(bool, CMSConcurrentMTEnabled, true,                               \
1893           "Whether multi-threaded concurrent work enabled "                 \
1894           "(effective only if ParNewGC)")                                   \
1895                                                                             \
1896   product(bool, CMSPrecleaningEnabled, true,                                \
1897           "Whether concurrent precleaning enabled")                         \
1898                                                                             \
1899   product(uintx, CMSPrecleanIter, 3,                                        \
1900           "Maximum number of precleaning iteration passes")                 \
1901           range(0, 9)                                                       \
1902                                                                             \
1903   product(uintx, CMSPrecleanDenominator, 3,                                 \
1904           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1905           "ratio")                                                          \
1906           range(1, max_uintx)                                               \
1907           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1908                                                                             \
1909   product(uintx, CMSPrecleanNumerator, 2,                                   \
1910           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1911           "ratio")                                                          \
1912           range(0, max_uintx-1)                                             \
1913           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1914                                                                             \
1915   product(bool, CMSPrecleanRefLists1, true,                                 \
1916           "Preclean ref lists during (initial) preclean phase")             \
1917                                                                             \
1918   product(bool, CMSPrecleanRefLists2, false,                                \
1919           "Preclean ref lists during abortable preclean phase")             \
1920                                                                             \
1921   product(bool, CMSPrecleanSurvivors1, false,                               \
1922           "Preclean survivors during (initial) preclean phase")             \
1923                                                                             \
1924   product(bool, CMSPrecleanSurvivors2, true,                                \
1925           "Preclean survivors during abortable preclean phase")             \
1926                                                                             \
1927   product(uintx, CMSPrecleanThreshold, 1000,                                \
1928           "Do not iterate again if number of dirty cards is less than this")\
1929           range(100, max_uintx)                                             \
1930                                                                             \
1931   product(bool, CMSCleanOnEnter, true,                                      \
1932           "Clean-on-enter optimization for reducing number of dirty cards") \
1933                                                                             \
1934   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1935           "Choose variant (1,2) of verification following remark")          \
1936           range(1, 2)                                                       \
1937                                                                             \
1938   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1939           "If Eden size is below this, do not try to schedule remark")      \
1940                                                                             \
1941   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1942           "The Eden occupancy percentage (0-100) at which "                 \
1943           "to try and schedule remark pause")                               \
1944           range(0, 100)                                                     \
1945                                                                             \
1946   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1947           "Start sampling eden top at least before young gen "              \
1948           "occupancy reaches 1/<ratio> of the size at which "               \
1949           "we plan to schedule remark")                                     \
1950           range(1, max_uintx)                                               \
1951                                                                             \
1952   product(uintx, CMSSamplingGrain, 16*K,                                    \
1953           "The minimum distance between eden samples for CMS (see above)")  \
1954           range(1, max_uintx)                                               \
1955                                                                             \
1956   product(bool, CMSScavengeBeforeRemark, false,                             \
1957           "Attempt scavenge before the CMS remark step")                    \
1958                                                                             \
1959   develop(bool, CMSTraceSweeper, false,                                     \
1960           "Trace some actions of the CMS sweeper")                          \
1961                                                                             \
1962   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1963           "Don't drain below this size per parallel worker/thief")          \
1964                                                                             \
1965   manageable(intx, CMSWaitDuration, 2000,                                   \
1966           "Time in milliseconds that CMS thread waits for young GC")        \
1967                                                                             \
1968   develop(uintx, CMSCheckInterval, 1000,                                    \
1969           "Interval in milliseconds that CMS thread checks if it "          \
1970           "should start a collection cycle")                                \
1971                                                                             \
1972   product(bool, CMSYield, true,                                             \
1973           "Yield between steps of CMS")                                     \
1974                                                                             \
1975   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1976           "Bitmap operations should process at most this many bits "        \
1977           "between yields")                                                 \
1978           range(1, max_uintx)                                               \
1979                                                                             \
1980   product(bool, CMSDumpAtPromotionFailure, false,                           \
1981           "Dump useful information about the state of the CMS old "         \
1982           "generation upon a promotion failure")                            \
1983                                                                             \
1984   product(bool, CMSPrintChunksInDump, false,                                \
1985           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1986           "more detailed information about the free chunks")                \
1987                                                                             \
1988   product(bool, CMSPrintObjectsInDump, false,                               \
1989           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1990           "more detailed information about the allocated objects")          \
1991                                                                             \
1992   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1993           "Verify that all references across the FLS boundary "             \
1994           "are to valid objects")                                           \
1995                                                                             \
1996   diagnostic(bool, FLSVerifyLists, false,                                   \
1997           "Do lots of (expensive) FreeListSpace verification")              \
1998                                                                             \
1999   diagnostic(bool, FLSVerifyIndexTable, false,                              \
2000           "Do lots of (expensive) FLS index table verification")            \
2001                                                                             \
2002   develop(bool, FLSVerifyDictionary, false,                                 \
2003           "Do lots of (expensive) FLS dictionary verification")             \
2004                                                                             \
2005   develop(bool, VerifyBlockOffsetArray, false,                              \
2006           "Do (expensive) block offset array verification")                 \
2007                                                                             \
2008   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
2009           "Maintain _unallocated_block in BlockOffsetArray "                \
2010           "(currently applicable only to CMS collector)")                   \
2011                                                                             \
2012   develop(bool, TraceCMSState, false,                                       \
2013           "Trace the state of the CMS collection")                          \
2014                                                                             \
2015   product(intx, RefDiscoveryPolicy, 0,                                      \
2016           "Select type of reference discovery policy: "                     \
2017           "reference-based(0) or referent-based(1)")                        \
2018           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
2019                 ReferenceProcessor::DiscoveryPolicyMax)                     \
2020                                                                             \
2021   product(bool, ParallelRefProcEnabled, false,                              \
2022           "Enable parallel reference processing whenever possible")         \
2023                                                                             \
2024   product(bool, ParallelRefProcBalancingEnabled, true,                      \
2025           "Enable balancing of reference processing queues")                \
2026                                                                             \
2027   product(uintx, CMSTriggerRatio, 80,                                       \
2028           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
2029           "allocated before a CMS collection cycle commences")              \
2030           range(0, 100)                                                     \
2031                                                                             \
2032   product(uintx, CMSBootstrapOccupancy, 50,                                 \
2033           "Percentage CMS generation occupancy at which to "                \
2034           "initiate CMS collection for bootstrapping collection stats")     \
2035           range(0, 100)                                                     \
2036                                                                             \
2037   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
2038           "Percentage CMS generation occupancy to start a CMS collection "  \
2039           "cycle. A negative value means that CMSTriggerRatio is used")     \
2040           range(min_intx, 100)                                              \
2041                                                                             \
2042   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
2043           "Percentage of the (entire) heap occupancy to start a "           \
2044           "concurrent GC cycle. It is used by GCs that trigger a "          \
2045           "concurrent GC cycle based on the occupancy of the entire heap, " \
2046           "not just one of the generations (e.g., G1). A value of 0 "       \
2047           "denotes 'do constant GC cycles'.")                               \
2048           range(0, 100)                                                     \
2049                                                                             \
2050   manageable(intx, CMSTriggerInterval, -1,                                  \
2051           "Commence a CMS collection cycle (at least) every so many "       \
2052           "milliseconds (0 permanently, -1 disabled)")                      \
2053           range(-1, max_intx)                                               \
2054                                                                             \
2055   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
2056           "Only use occupancy as a criterion for starting a CMS collection")\
2057                                                                             \
2058   product(uintx, CMSIsTooFullPercentage, 98,                                \
2059           "An absolute ceiling above which CMS will always consider the "   \
2060           "unloading of classes when class unloading is enabled")           \
2061           range(0, 100)                                                     \
2062                                                                             \
2063   develop(bool, CMSTestInFreeList, false,                                   \
2064           "Check if the coalesced range is already in the "                 \
2065           "free lists as claimed")                                          \
2066                                                                             \
2067   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
2068           "Check that all the garbage collected was returned to the "       \
2069           "free lists")                                                     \
2070                                                                             \
2071   notproduct(bool, ScavengeALot, false,                                     \
2072           "Force scavenge at every Nth exit from the runtime system "       \
2073           "(N=ScavengeALotInterval)")                                       \
2074                                                                             \
2075   develop(bool, FullGCALot, false,                                          \
2076           "Force full gc at every Nth exit from the runtime system "        \
2077           "(N=FullGCALotInterval)")                                         \
2078                                                                             \
2079   notproduct(bool, GCALotAtAllSafepoints, false,                            \
2080           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
2081                                                                             \
2082   product(bool, PrintPromotionFailure, false,                               \
2083           "Print additional diagnostic information following "              \
2084           "promotion failure")                                              \
2085                                                                             \
2086   notproduct(bool, PromotionFailureALot, false,                             \
2087           "Use promotion failure handling on every young generation "       \
2088           "collection")                                                     \
2089                                                                             \
2090   develop(uintx, PromotionFailureALotCount, 1000,                           \
2091           "Number of promotion failures occurring at PLAB "                 \
2092           "refill attempts (ParNew) or promotion attempts "                 \
2093           "(other young collectors)")                                       \
2094                                                                             \
2095   develop(uintx, PromotionFailureALotInterval, 5,                           \
2096           "Total collections between promotion failures a lot")             \
2097                                                                             \
2098   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2099           "Sleep time when sleep is used for yields")                       \
2100                                                                             \
2101   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2102           "Number of yields before a sleep is done during work stealing")   \
2103                                                                             \
2104   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2105           "Number of iterations in a spin loop between checks on "          \
2106           "time out of hard spin")                                          \
2107                                                                             \
2108   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2109           "Ratio of hard spins to calls to yield")                          \
2110                                                                             \
2111   develop(uintx, ObjArrayMarkingStride, 512,                                \
2112           "Number of object array elements to push onto the marking stack " \
2113           "before pushing a continuation entry")                            \
2114                                                                             \
2115   develop(bool, MetadataAllocationFailALot, false,                          \
2116           "Fail metadata allocations at intervals controlled by "           \
2117           "MetadataAllocationFailALotInterval")                             \
2118                                                                             \
2119   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2120           "Metadata allocation failure a lot interval")                     \
2121                                                                             \
2122   develop(bool, TraceMetadataChunkAllocation, false,                        \
2123           "Trace chunk metadata allocations")                               \
2124                                                                             \
2125   product(bool, TraceMetadataHumongousAllocation, false,                    \
2126           "Trace humongous metadata allocations")                           \
2127                                                                             \
2128   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
2129           "Trace virtual space metadata allocations")                       \
2130                                                                             \
2131   notproduct(bool, ExecuteInternalVMTests, false,                           \
2132           "Enable execution of internal VM tests")                          \
2133                                                                             \
2134   notproduct(bool, VerboseInternalVMTests, false,                           \
2135           "Turn on logging for internal VM tests.")                         \
2136                                                                             \
2137   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2138                                                                             \
2139   product_pd(bool, ResizeTLAB,                                              \
2140           "Dynamically resize TLAB size for threads")                       \
2141                                                                             \
2142   product(bool, ZeroTLAB, false,                                            \
2143           "Zero out the newly created TLAB")                                \
2144                                                                             \
2145   product(bool, FastTLABRefill, true,                                       \
2146           "Use fast TLAB refill code")                                      \
2147                                                                             \
2148   product(bool, PrintTLAB, false,                                           \
2149           "Print various TLAB related information")                         \
2150                                                                             \
2151   product(bool, TLABStats, true,                                            \
2152           "Provide more detailed and expensive TLAB statistics "            \
2153           "(with PrintTLAB)")                                               \
2154                                                                             \
2155   product_pd(bool, NeverActAsServerClassMachine,                            \
2156           "Never act like a server-class machine")                          \
2157                                                                             \
2158   product(bool, AlwaysActAsServerClassMachine, false,                       \
2159           "Always act like a server-class machine")                         \
2160                                                                             \
2161   product_pd(uint64_t, MaxRAM,                                              \
2162           "Real memory size (in bytes) used to set maximum heap size")      \
2163                                                                             \
2164   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2165           "Maximum ergonomically set heap size (in bytes); zero means use " \
2166           "MaxRAM / MaxRAMFraction")                                        \
2167                                                                             \
2168   product(uintx, MaxRAMFraction, 4,                                         \
2169           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2170           "size")                                                           \
2171           range(1, max_uintx)                                               \
2172                                                                             \
2173   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2174           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2175           "size; deprecated: to be renamed to MaxRAMFraction")              \
2176           range(1, max_uintx)                                               \
2177                                                                             \
2178   product(uintx, MinRAMFraction, 2,                                         \
2179           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2180           "size on systems with small physical memory size")                \
2181           range(1, max_uintx)                                               \
2182                                                                             \
2183   product(uintx, InitialRAMFraction, 64,                                    \
2184           "Fraction (1/n) of real memory used for initial heap size")       \
2185           range(1, max_uintx)                                               \
2186                                                                             \
2187   develop(uintx, MaxVirtMemFraction, 2,                                     \
2188           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2189           "determining maximum heap size")                                  \
2190                                                                             \
2191   product(bool, UseAutoGCSelectPolicy, false,                               \
2192           "Use automatic collection selection policy")                      \
2193                                                                             \
2194   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2195           "Automatic GC selection pause threshold in milliseconds")         \
2196                                                                             \
2197   product(bool, UseAdaptiveSizePolicy, true,                                \
2198           "Use adaptive generation sizing policies")                        \
2199                                                                             \
2200   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2201           "Use adaptive survivor sizing policies")                          \
2202                                                                             \
2203   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2204           "Use adaptive young-old sizing policies at minor collections")    \
2205                                                                             \
2206   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2207           "Use adaptive young-old sizing policies at major collections")    \
2208                                                                             \
2209   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2210           "Include statistics from System.gc() for adaptive size policy")   \
2211                                                                             \
2212   product(bool, UseAdaptiveGCBoundary, false,                               \
2213           "Allow young-old boundary to move")                               \
2214                                                                             \
2215   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2216           "Trace young-old boundary moves")                                 \
2217                                                                             \
2218   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2219           "Resize the virtual spaces of the young or old generations")      \
2220                                                                             \
2221   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2222           "Policy for changing generation size for throughput goals")       \
2223                                                                             \
2224   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2225           "Adjust tenured generation to achieve a minor pause goal")        \
2226                                                                             \
2227   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2228           "Adjust young generation to achieve a major pause goal")          \
2229                                                                             \
2230   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2231           "Number of steps where heuristics is used before data is used")   \
2232                                                                             \
2233   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2234           "Number of collections before the adaptive sizing is started")    \
2235                                                                             \
2236   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2237           "Collection interval for printing information; zero means never") \
2238                                                                             \
2239   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2240           "Use adaptive minimum footprint as a goal")                       \
2241                                                                             \
2242   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2243           "Weight given to exponential resizing, between 0 and 100")        \
2244           range(0, 100)                                                     \
2245                                                                             \
2246   product(uintx, AdaptiveTimeWeight,       25,                              \
2247           "Weight given to time in adaptive policy, between 0 and 100")     \
2248           range(0, 100)                                                     \
2249                                                                             \
2250   product(uintx, PausePadding, 1,                                           \
2251           "How much buffer to keep for pause time")                         \
2252                                                                             \
2253   product(uintx, PromotedPadding, 3,                                        \
2254           "How much buffer to keep for promotion failure")                  \
2255                                                                             \
2256   product(uintx, SurvivorPadding, 3,                                        \
2257           "How much buffer to keep for survivor overflow")                  \
2258                                                                             \
2259   product(uintx, ThresholdTolerance, 10,                                    \
2260           "Allowed collection cost difference between generations")         \
2261           range(0, 100)                                                     \
2262                                                                             \
2263   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2264           "If collection costs are within margin, reduce both by full "     \
2265           "delta")                                                          \
2266                                                                             \
2267   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2268           "Adaptive size percentage change in young generation")            \
2269           range(0, 100)                                                     \
2270                                                                             \
2271   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2272           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2273           range(0, 100)                                                     \
2274                                                                             \
2275   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2276           "Decay factor to YoungedGenerationSizeSupplement")                \
2277           range(1, max_uintx)                                               \
2278                                                                             \
2279   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2280           "Adaptive size percentage change in tenured generation")          \
2281           range(0, 100)                                                     \
2282                                                                             \
2283   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2284           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2285           range(0, 100)                                                     \
2286                                                                             \
2287   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2288           "Decay factor to TenuredGenerationSizeIncrement")                 \
2289           range(1, max_uintx)                                               \
2290                                                                             \
2291   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2292           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2293           "or (G1 Only) the maximum GC time per MMU time slice")            \
2294                                                                             \
2295   product(uintx, GCPauseIntervalMillis, 0,                                  \
2296           "Time slice for MMU specification")                               \
2297                                                                             \
2298   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2299           "Adaptive size policy maximum GC minor pause time goal "          \
2300           "in millisecond")                                                 \
2301                                                                             \
2302   product(uintx, GCTimeRatio, 99,                                           \
2303           "Adaptive size policy application time to GC time ratio")         \
2304                                                                             \
2305   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2306           "Adaptive size scale down factor for shrinking")                  \
2307           range(1, max_uintx)                                               \
2308                                                                             \
2309   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2310           "Adaptive size decays the major cost for long major intervals")   \
2311                                                                             \
2312   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2313           "Time scale over which major costs decay")                        \
2314                                                                             \
2315   product(uintx, MinSurvivorRatio, 3,                                       \
2316           "Minimum ratio of young generation/survivor space size")          \
2317                                                                             \
2318   product(uintx, InitialSurvivorRatio, 8,                                   \
2319           "Initial ratio of young generation/survivor space size")          \
2320                                                                             \
2321   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2322           "Estimate of footprint other than Java Heap")                     \
2323                                                                             \
2324   product(bool, UseGCOverheadLimit, true,                                   \
2325           "Use policy to limit of proportion of time spent in GC "          \
2326           "before an OutOfMemory error is thrown")                          \
2327                                                                             \
2328   product(uintx, GCTimeLimit, 98,                                           \
2329           "Limit of the proportion of time spent in GC before "             \
2330           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2331           range(0, 100)                                                     \
2332                                                                             \
2333   product(uintx, GCHeapFreeLimit, 2,                                        \
2334           "Minimum percentage of free space after a full GC before an "     \
2335           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2336           range(0, 100)                                                     \
2337                                                                             \
2338   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2339           "Number of consecutive collections before gc time limit fires")   \
2340                                                                             \
2341   product(bool, PrintAdaptiveSizePolicy, false,                             \
2342           "Print information about AdaptiveSizePolicy")                     \
2343                                                                             \
2344   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2345           "How far ahead to prefetch destination area (<= 0 means off)")    \
2346                                                                             \
2347   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2348           "How far ahead to prefetch scan area (<= 0 means off)")           \
2349                                                                             \
2350   product(intx, PrefetchFieldsAhead, -1,                                    \
2351           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2352                                                                             \
2353   diagnostic(bool, VerifySilently, false,                                   \
2354           "Do not print the verification progress")                         \
2355                                                                             \
2356   diagnostic(bool, VerifyDuringStartup, false,                              \
2357           "Verify memory system before executing any Java code "            \
2358           "during VM initialization")                                       \
2359                                                                             \
2360   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2361           "Verify system before exiting")                                   \
2362                                                                             \
2363   diagnostic(bool, VerifyBeforeGC, false,                                   \
2364           "Verify memory system before GC")                                 \
2365                                                                             \
2366   diagnostic(bool, VerifyAfterGC, false,                                    \
2367           "Verify memory system after GC")                                  \
2368                                                                             \
2369   diagnostic(bool, VerifyDuringGC, false,                                   \
2370           "Verify memory system during GC (between phases)")                \
2371                                                                             \
2372   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2373           "Enable parallel memory system verification")                     \
2374                                                                             \
2375   diagnostic(bool, DeferInitialCardMark, false,                             \
2376           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2377           "may arise from new_pre_store_barrier")                           \
2378                                                                             \
2379   product(bool, UseCondCardMark, false,                                     \
2380           "Check for already marked card before updating card table")       \
2381                                                                             \
2382   diagnostic(bool, VerifyRememberedSets, false,                             \
2383           "Verify GC remembered sets")                                      \
2384                                                                             \
2385   diagnostic(bool, VerifyObjectStartArray, true,                            \
2386           "Verify GC object start array if verify before/after")            \
2387                                                                             \
2388   product(bool, DisableExplicitGC, false,                                   \
2389           "Ignore calls to System.gc()")                                    \
2390                                                                             \
2391   notproduct(bool, CheckMemoryInitialization, false,                        \
2392           "Check memory initialization")                                    \
2393                                                                             \
2394   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2395           "Bind CMS Thread to CPU if possible")                             \
2396                                                                             \
2397   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2398           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2399                                                                             \
2400   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2401           "Bind GCTaskThreads to CPUs if possible")                         \
2402                                                                             \
2403   product(bool, UseGCTaskAffinity, false,                                   \
2404           "Use worker affinity when asking for GCTasks")                    \
2405                                                                             \
2406   product(uintx, ProcessDistributionStride, 4,                              \
2407           "Stride through processors when distributing processes")          \
2408                                                                             \
2409   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2410           "Number of times the coordinator GC thread will sleep while "     \
2411           "yielding before giving up and resuming GC")                      \
2412                                                                             \
2413   product(uintx, CMSYieldSleepCount, 0,                                     \
2414           "Number of times a GC thread (minus the coordinator) "            \
2415           "will sleep while yielding before giving up and resuming GC")     \
2416                                                                             \
2417   /* gc tracing */                                                          \
2418   manageable(bool, PrintGC, false,                                          \
2419           "Print message at garbage collection")                            \
2420                                                                             \
2421   manageable(bool, PrintGCDetails, false,                                   \
2422           "Print more details at garbage collection")                       \
2423                                                                             \
2424   manageable(bool, PrintGCDateStamps, false,                                \
2425           "Print date stamps at garbage collection")                        \
2426                                                                             \
2427   manageable(bool, PrintGCTimeStamps, false,                                \
2428           "Print timestamps at garbage collection")                         \
2429                                                                             \
2430   manageable(bool, PrintGCID, true,                                         \
2431           "Print an identifier for each garbage collection")                \
2432                                                                             \
2433   product(bool, PrintGCTaskTimeStamps, false,                               \
2434           "Print timestamps for individual gc worker thread tasks")         \
2435                                                                             \
2436   develop(intx, ConcGCYieldTimeout, 0,                                      \
2437           "If non-zero, assert that GC threads yield within this "          \
2438           "number of milliseconds")                                         \
2439                                                                             \
2440   product(bool, PrintReferenceGC, false,                                    \
2441           "Print times spent handling reference objects during GC "         \
2442           "(enabled only when PrintGCDetails)")                             \
2443                                                                             \
2444   develop(bool, TraceReferenceGC, false,                                    \
2445           "Trace handling of soft/weak/final/phantom references")           \
2446                                                                             \
2447   develop(bool, TraceFinalizerRegistration, false,                          \
2448           "Trace registration of final references")                         \
2449                                                                             \
2450   notproduct(bool, TraceScavenge, false,                                    \
2451           "Trace scavenge")                                                 \
2452                                                                             \
2453   product(bool, IgnoreEmptyClassPaths, false,                               \
2454           "Ignore empty path elements in -classpath")                       \
2455                                                                             \
2456   product(bool, TraceClassPaths, false,                                     \
2457           "Trace processing of class paths")                                \
2458                                                                             \
2459   product_rw(bool, TraceClassLoading, false,                                \
2460           "Trace all classes loaded")                                       \
2461                                                                             \
2462   product(bool, TraceClassLoadingPreorder, false,                           \
2463           "Trace all classes loaded in order referenced (not loaded)")      \
2464                                                                             \
2465   product_rw(bool, TraceClassUnloading, false,                              \
2466           "Trace unloading of classes")                                     \
2467                                                                             \
2468   product_rw(bool, TraceLoaderConstraints, false,                           \
2469           "Trace loader constraints")                                       \
2470                                                                             \
2471   develop(bool, TraceClassLoaderData, false,                                \
2472           "Trace class loader loader_data lifetime")                        \
2473                                                                             \
2474   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2475           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2476           "Initial size of the boot class loader data metaspace")           \
2477                                                                             \
2478   product(bool, TraceYoungGenTime, false,                                   \
2479           "Trace accumulated time for young collection")                    \
2480                                                                             \
2481   product(bool, TraceOldGenTime, false,                                     \
2482           "Trace accumulated time for old collection")                      \
2483                                                                             \
2484   product(bool, PrintTenuringDistribution, false,                           \
2485           "Print tenuring age information")                                 \
2486                                                                             \
2487   product_rw(bool, PrintHeapAtGC, false,                                    \
2488           "Print heap layout before and after each GC")                     \
2489                                                                             \
2490   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2491           "Print extended information about the layout of the heap "        \
2492           "when -XX:+PrintHeapAtGC is set")                                 \
2493                                                                             \
2494   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2495           "Print heap layout in response to SIGBREAK")                      \
2496                                                                             \
2497   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2498           "Print a class histogram before any major stop-world GC")         \
2499                                                                             \
2500   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2501           "Print a class histogram after any major stop-world GC")          \
2502                                                                             \
2503   manageable(bool, PrintClassHistogram, false,                              \
2504           "Print a histogram of class instances")                           \
2505                                                                             \
2506   develop(bool, TraceWorkGang, false,                                       \
2507           "Trace activities of work gangs")                                 \
2508                                                                             \
2509   product(bool, TraceParallelOldGCTasks, false,                             \
2510           "Trace multithreaded GC activity")                                \
2511                                                                             \
2512   develop(bool, TraceBlockOffsetTable, false,                               \
2513           "Print BlockOffsetTable maps")                                    \
2514                                                                             \
2515   develop(bool, TraceCardTableModRefBS, false,                              \
2516           "Print CardTableModRefBS maps")                                   \
2517                                                                             \
2518   develop(bool, TraceGCTaskManager, false,                                  \
2519           "Trace actions of the GC task manager")                           \
2520                                                                             \
2521   develop(bool, TraceGCTaskQueue, false,                                    \
2522           "Trace actions of the GC task queues")                            \
2523                                                                             \
2524   diagnostic(bool, TraceGCTaskThread, false,                                \
2525           "Trace actions of the GC task threads")                           \
2526                                                                             \
2527   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2528           "Print the time taken by each phase in ParallelOldGC "            \
2529           "(PrintGCDetails must also be enabled)")                          \
2530                                                                             \
2531   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2532           "Trace marking phase in ParallelOldGC")                           \
2533                                                                             \
2534   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2535           "Trace summary phase in ParallelOldGC")                           \
2536                                                                             \
2537   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2538           "Trace compaction phase in ParallelOldGC")                        \
2539                                                                             \
2540   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2541           "Trace dense prefix computation for ParallelOldGC")               \
2542                                                                             \
2543   develop(bool, IgnoreLibthreadGPFault, false,                              \
2544           "Suppress workaround for libthread GP fault")                     \
2545                                                                             \
2546   product(bool, PrintJNIGCStalls, false,                                    \
2547           "Print diagnostic message when GC is stalled "                    \
2548           "by JNI critical section")                                        \
2549                                                                             \
2550   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2551           "The percentage of the used heap that the instances of a class "  \
2552           "must occupy for the class to generate a trace event")            \
2553                                                                             \
2554   /* GC log rotation setting */                                             \
2555                                                                             \
2556   product(bool, UseGCLogFileRotation, false,                                \
2557           "Rotate gclog files (for long running applications). It requires "\
2558           "-Xloggc:<filename>")                                             \
2559                                                                             \
2560   product(uintx, NumberOfGCLogFiles, 0,                                     \
2561           "Number of gclog files in rotation "                              \
2562           "(default: 0, no rotation)")                                      \
2563                                                                             \
2564   product(size_t, GCLogFileSize, 8*K,                                       \
2565           "GC log file size, requires UseGCLogFileRotation. "               \
2566           "Set to 0 to only trigger rotation via jcmd")                     \
2567                                                                             \
2568   /* JVMTI heap profiling */                                                \
2569                                                                             \
2570   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2571           "Trace JVMTI object tagging calls")                               \
2572                                                                             \
2573   diagnostic(bool, VerifyBeforeIteration, false,                            \
2574           "Verify memory system before JVMTI iteration")                    \
2575                                                                             \
2576   /* compiler interface */                                                  \
2577                                                                             \
2578   develop(bool, CIPrintCompilerName, false,                                 \
2579           "when CIPrint is active, print the name of the active compiler")  \
2580                                                                             \
2581   diagnostic(bool, CIPrintCompileQueue, false,                              \
2582           "display the contents of the compile queue whenever a "           \
2583           "compilation is enqueued")                                        \
2584                                                                             \
2585   develop(bool, CIPrintRequests, false,                                     \
2586           "display every request for compilation")                          \
2587                                                                             \
2588   product(bool, CITime, false,                                              \
2589           "collect timing information for compilation")                     \
2590                                                                             \
2591   develop(bool, CITimeVerbose, false,                                       \
2592           "be more verbose in compilation timings")                         \
2593                                                                             \
2594   develop(bool, CITimeEach, false,                                          \
2595           "display timing information after each successful compilation")   \
2596                                                                             \
2597   develop(bool, CICountOSR, false,                                          \
2598           "use a separate counter when assigning ids to osr compilations")  \
2599                                                                             \
2600   develop(bool, CICompileNatives, true,                                     \
2601           "compile native methods if supported by the compiler")            \
2602                                                                             \
2603   develop_pd(bool, CICompileOSR,                                            \
2604           "compile on stack replacement methods if supported by the "       \
2605           "compiler")                                                       \
2606                                                                             \
2607   develop(bool, CIPrintMethodCodes, false,                                  \
2608           "print method bytecodes of the compiled code")                    \
2609                                                                             \
2610   develop(bool, CIPrintTypeFlow, false,                                     \
2611           "print the results of ciTypeFlow analysis")                       \
2612                                                                             \
2613   develop(bool, CITraceTypeFlow, false,                                     \
2614           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2615                                                                             \
2616   develop(intx, OSROnlyBCI, -1,                                             \
2617           "OSR only at this bci.  Negative values mean exclude that bci")   \
2618                                                                             \
2619   /* compiler */                                                            \
2620                                                                             \
2621   /* notice: the max range value here is max_jint, not max_intx  */         \
2622   /* because of overflow issue                                   */         \
2623   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2624           "Number of compiler threads to run")                              \
2625           range(0, max_jint)                                                \
2626           constraint(CICompilerCountConstraintFunc, AtParse)                \
2627                                                                             \
2628   product(intx, CompilationPolicyChoice, 0,                                 \
2629           "which compilation policy (0-3)")                                 \
2630           range(0, 3)                                                       \
2631                                                                             \
2632   develop(bool, UseStackBanging, true,                                      \
2633           "use stack banging for stack overflow checks (required for "      \
2634           "proper StackOverflow handling; disable only to measure cost "    \
2635           "of stackbanging)")                                               \
2636                                                                             \
2637   develop(bool, UseStrictFP, true,                                          \
2638           "use strict fp if modifier strictfp is set")                      \
2639                                                                             \
2640   develop(bool, GenerateSynchronizationCode, true,                          \
2641           "generate locking/unlocking code for synchronized methods and "   \
2642           "monitors")                                                       \
2643                                                                             \
2644   develop(bool, GenerateCompilerNullChecks, true,                           \
2645           "Generate explicit null checks for loads/stores/calls")           \
2646                                                                             \
2647   develop(bool, GenerateRangeChecks, true,                                  \
2648           "Generate range checks for array accesses")                       \
2649                                                                             \
2650   develop_pd(bool, ImplicitNullChecks,                                      \
2651           "Generate code for implicit null checks")                         \
2652                                                                             \
2653   product_pd(bool, TrapBasedNullChecks,                                     \
2654           "Generate code for null checks that uses a cmp and trap "         \
2655           "instruction raising SIGTRAP.  This is only used if an access to" \
2656           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2657           "ImplicitNullChecks don't work (PPC64).")                         \
2658                                                                             \
2659   product(bool, PrintSafepointStatistics, false,                            \
2660           "Print statistics about safepoint synchronization")               \
2661                                                                             \
2662   product(intx, PrintSafepointStatisticsCount, 300,                         \
2663           "Total number of safepoint statistics collected "                 \
2664           "before printing them out")                                       \
2665                                                                             \
2666   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2667           "Print safepoint statistics only when safepoint takes "           \
2668           "more than PrintSafepointSatisticsTimeout in millis")             \
2669                                                                             \
2670   product(bool, TraceSafepointCleanupTime, false,                           \
2671           "Print the break down of clean up tasks performed during "        \
2672           "safepoint")                                                      \
2673                                                                             \
2674   product(bool, Inline, true,                                               \
2675           "Enable inlining")                                                \
2676                                                                             \
2677   product(bool, ClipInlining, true,                                         \
2678           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2679                                                                             \
2680   develop(bool, UseCHA, true,                                               \
2681           "Enable CHA")                                                     \
2682                                                                             \
2683   product(bool, UseTypeProfile, true,                                       \
2684           "Check interpreter profile for historically monomorphic calls")   \
2685                                                                             \
2686   diagnostic(bool, PrintInlining, false,                                    \
2687           "Print inlining optimizations")                                   \
2688                                                                             \
2689   product(bool, UsePopCountInstruction, false,                              \
2690           "Use population count instruction")                               \
2691                                                                             \
2692   develop(bool, EagerInitialization, false,                                 \
2693           "Eagerly initialize classes if possible")                         \
2694                                                                             \
2695   diagnostic(bool, LogTouchedMethods, false,                                \
2696           "Log methods which have been ever touched in runtime")            \
2697                                                                             \
2698   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2699           "Print all methods that have been ever touched in runtime")       \
2700                                                                             \
2701   develop(bool, TraceMethodReplacement, false,                              \
2702           "Print when methods are replaced do to recompilation")            \
2703                                                                             \
2704   develop(bool, PrintMethodFlushing, false,                                 \
2705           "Print the nmethods being flushed")                               \
2706                                                                             \
2707   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2708           "print statistics about method flushing")                         \
2709                                                                             \
2710   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2711           "Number of compiled code invocations after which "                \
2712           "the method is considered as hot by the flusher")                 \
2713                                                                             \
2714   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2715           "Minimum number of sweeper passes before an nmethod "             \
2716           "can be flushed")                                                 \
2717                                                                             \
2718   product(bool, UseCodeAging, true,                                         \
2719           "Insert counter to detect warm methods")                          \
2720                                                                             \
2721   diagnostic(bool, StressCodeAging, false,                                  \
2722           "Start with counters compiled in")                                \
2723                                                                             \
2724   develop(bool, UseRelocIndex, false,                                       \
2725           "Use an index to speed random access to relocations")             \
2726                                                                             \
2727   develop(bool, StressCodeBuffers, false,                                   \
2728           "Exercise code buffer expansion and other rare state changes")    \
2729                                                                             \
2730   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2731           "Generate extra debugging information for non-safepoints in "     \
2732           "nmethods")                                                       \
2733                                                                             \
2734   product(bool, PrintVMOptions, false,                                      \
2735           "Print flags that appeared on the command line")                  \
2736                                                                             \
2737   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2738           "Ignore unrecognized VM options")                                 \
2739                                                                             \
2740   product(bool, PrintCommandLineFlags, false,                               \
2741           "Print flags specified on command line or set by ergonomics")     \
2742                                                                             \
2743   product(bool, PrintFlagsInitial, false,                                   \
2744           "Print all VM flags before argument processing and exit VM")      \
2745                                                                             \
2746   product(bool, PrintFlagsFinal, false,                                     \
2747           "Print all VM flags after argument and ergonomic processing")     \
2748                                                                             \
2749   notproduct(bool, PrintFlagsWithComments, false,                           \
2750           "Print all VM flags with default values and descriptions and "    \
2751           "exit")                                                           \
2752                                                                             \
2753   product(bool, PrintFlagsRanges, false,                                    \
2754           "Print VM flags and their ranges and exit VM")                    \
2755                                                                             \
2756   diagnostic(bool, SerializeVMOutput, true,                                 \
2757           "Use a mutex to serialize output to tty and LogFile")             \
2758                                                                             \
2759   diagnostic(bool, DisplayVMOutput, true,                                   \
2760           "Display all VM output on the tty, independently of LogVMOutput") \
2761                                                                             \
2762   diagnostic(bool, LogVMOutput, false,                                      \
2763           "Save VM output to LogFile")                                      \
2764                                                                             \
2765   diagnostic(ccstr, LogFile, NULL,                                          \
2766           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2767           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2768                                                                             \
2769   product(ccstr, ErrorFile, NULL,                                           \
2770           "If an error occurs, save the error data to this file "           \
2771           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2772                                                                             \
2773   product(bool, DisplayVMOutputToStderr, false,                             \
2774           "If DisplayVMOutput is true, display all VM output to stderr")    \
2775                                                                             \
2776   product(bool, DisplayVMOutputToStdout, false,                             \
2777           "If DisplayVMOutput is true, display all VM output to stdout")    \
2778                                                                             \
2779   product(bool, UseHeavyMonitors, false,                                    \
2780           "use heavyweight instead of lightweight Java monitors")           \
2781                                                                             \
2782   product(bool, PrintStringTableStatistics, false,                          \
2783           "print statistics about the StringTable and SymbolTable")         \
2784                                                                             \
2785   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2786           "verify StringTable contents at exit")                            \
2787                                                                             \
2788   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2789           "print histogram of the symbol table")                            \
2790                                                                             \
2791   notproduct(bool, ExitVMOnVerifyError, false,                              \
2792           "standard exit from VM if bytecode verify error "                 \
2793           "(only in debug mode)")                                           \
2794                                                                             \
2795   notproduct(ccstr, AbortVMOnException, NULL,                               \
2796           "Call fatal if this exception is thrown.  Example: "              \
2797           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2798                                                                             \
2799   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2800           "Call fatal if the exception pointed by AbortVMOnException "      \
2801           "has this message")                                               \
2802                                                                             \
2803   develop(bool, DebugVtables, false,                                        \
2804           "add debugging code to vtable dispatch")                          \
2805                                                                             \
2806   develop(bool, PrintVtables, false,                                        \
2807           "print vtables when printing klass")                              \
2808                                                                             \
2809   notproduct(bool, PrintVtableStats, false,                                 \
2810           "print vtables stats at end of run")                              \
2811                                                                             \
2812   develop(bool, TraceCreateZombies, false,                                  \
2813           "trace creation of zombie nmethods")                              \
2814                                                                             \
2815   notproduct(bool, IgnoreLockingAssertions, false,                          \
2816           "disable locking assertions (for speed)")                         \
2817                                                                             \
2818   product(bool, RangeCheckElimination, true,                                \
2819           "Eliminate range checks")                                         \
2820                                                                             \
2821   develop_pd(bool, UncommonNullCast,                                        \
2822           "track occurrences of null in casts; adjust compiler tactics")    \
2823                                                                             \
2824   develop(bool, TypeProfileCasts,  true,                                    \
2825           "treat casts like calls for purposes of type profiling")          \
2826                                                                             \
2827   develop(bool, DelayCompilationDuringStartup, true,                        \
2828           "Delay invoking the compiler until main application class is "    \
2829           "loaded")                                                         \
2830                                                                             \
2831   develop(bool, CompileTheWorld, false,                                     \
2832           "Compile all methods in all classes in bootstrap class path "     \
2833           "(stress test)")                                                  \
2834                                                                             \
2835   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2836           "Preload all classes used by a class before start loading")       \
2837                                                                             \
2838   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2839           "Force a safepoint every n compiles so sweeper can keep up")      \
2840                                                                             \
2841   develop(bool, FillDelaySlots, true,                                       \
2842           "Fill delay slots (on SPARC only)")                               \
2843                                                                             \
2844   develop(bool, TimeLivenessAnalysis, false,                                \
2845           "Time computation of bytecode liveness analysis")                 \
2846                                                                             \
2847   develop(bool, TraceLivenessGen, false,                                    \
2848           "Trace the generation of liveness analysis information")          \
2849                                                                             \
2850   notproduct(bool, TraceLivenessQuery, false,                               \
2851           "Trace queries of liveness analysis information")                 \
2852                                                                             \
2853   notproduct(bool, CollectIndexSetStatistics, false,                        \
2854           "Collect information about IndexSets")                            \
2855                                                                             \
2856   develop(bool, UseLoopSafepoints, true,                                    \
2857           "Generate Safepoint nodes in every loop")                         \
2858                                                                             \
2859   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2860           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2861           "Inline allocations larger than this in doublewords must go slow")\
2862                                                                             \
2863   product(bool, AggressiveOpts, false,                                      \
2864           "Enable aggressive optimizations - see arguments.cpp")            \
2865                                                                             \
2866   product_pd(uintx, TypeProfileLevel,                                       \
2867           "=XYZ, with Z: Type profiling of arguments at call; "             \
2868                      "Y: Type profiling of return value at call; "          \
2869                      "X: Type profiling of parameters to methods; "         \
2870           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2871                                                                             \
2872   product(intx, TypeProfileArgsLimit,     2,                                \
2873           "max number of call arguments to consider for type profiling")    \
2874                                                                             \
2875   product(intx, TypeProfileParmsLimit,    2,                                \
2876           "max number of incoming parameters to consider for type profiling"\
2877           ", -1 for all")                                                   \
2878                                                                             \
2879   /* statistics */                                                          \
2880   develop(bool, CountCompiledCalls, false,                                  \
2881           "Count method invocations")                                       \
2882                                                                             \
2883   notproduct(bool, CountRuntimeCalls, false,                                \
2884           "Count VM runtime calls")                                         \
2885                                                                             \
2886   develop(bool, CountJNICalls, false,                                       \
2887           "Count jni method invocations")                                   \
2888                                                                             \
2889   notproduct(bool, CountJVMCalls, false,                                    \
2890           "Count jvm method invocations")                                   \
2891                                                                             \
2892   notproduct(bool, CountRemovableExceptions, false,                         \
2893           "Count exceptions that could be replaced by branches due to "     \
2894           "inlining")                                                       \
2895                                                                             \
2896   notproduct(bool, ICMissHistogram, false,                                  \
2897           "Produce histogram of IC misses")                                 \
2898                                                                             \
2899   /* interpreter */                                                         \
2900   develop(bool, ClearInterpreterLocals, false,                              \
2901           "Always clear local variables of interpreter activations upon "   \
2902           "entry")                                                          \
2903                                                                             \
2904   product_pd(bool, RewriteBytecodes,                                        \
2905           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2906                                                                             \
2907   product_pd(bool, RewriteFrequentPairs,                                    \
2908           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2909                                                                             \
2910   diagnostic(bool, PrintInterpreter, false,                                 \
2911           "Print the generated interpreter code")                           \
2912                                                                             \
2913   product(bool, UseInterpreter, true,                                       \
2914           "Use interpreter for non-compiled methods")                       \
2915                                                                             \
2916   develop(bool, UseFastSignatureHandlers, true,                             \
2917           "Use fast signature handlers for native calls")                   \
2918                                                                             \
2919   product(bool, UseLoopCounter, true,                                       \
2920           "Increment invocation counter on backward branch")                \
2921                                                                             \
2922   product_pd(bool, UseOnStackReplacement,                                   \
2923           "Use on stack replacement, calls runtime if invoc. counter "      \
2924           "overflows in loop")                                              \
2925                                                                             \
2926   notproduct(bool, TraceOnStackReplacement, false,                          \
2927           "Trace on stack replacement")                                     \
2928                                                                             \
2929   product_pd(bool, PreferInterpreterNativeStubs,                            \
2930           "Use always interpreter stubs for native methods invoked via "    \
2931           "interpreter")                                                    \
2932                                                                             \
2933   develop(bool, CountBytecodes, false,                                      \
2934           "Count number of bytecodes executed")                             \
2935                                                                             \
2936   develop(bool, PrintBytecodeHistogram, false,                              \
2937           "Print histogram of the executed bytecodes")                      \
2938                                                                             \
2939   develop(bool, PrintBytecodePairHistogram, false,                          \
2940           "Print histogram of the executed bytecode pairs")                 \
2941                                                                             \
2942   diagnostic(bool, PrintSignatureHandlers, false,                           \
2943           "Print code generated for native method signature handlers")      \
2944                                                                             \
2945   develop(bool, VerifyOops, false,                                          \
2946           "Do plausibility checks for oops")                                \
2947                                                                             \
2948   develop(bool, CheckUnhandledOops, false,                                  \
2949           "Check for unhandled oops in VM code")                            \
2950                                                                             \
2951   develop(bool, VerifyJNIFields, trueInDebug,                               \
2952           "Verify jfieldIDs for instance fields")                           \
2953                                                                             \
2954   notproduct(bool, VerifyJNIEnvThread, false,                               \
2955           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2956           "from JNI")                                                       \
2957                                                                             \
2958   develop(bool, VerifyFPU, false,                                           \
2959           "Verify FPU state (check for NaN's, etc.)")                       \
2960                                                                             \
2961   develop(bool, VerifyThread, false,                                        \
2962           "Watch the thread register for corruption (SPARC only)")          \
2963                                                                             \
2964   develop(bool, VerifyActivationFrameSize, false,                           \
2965           "Verify that activation frame didn't become smaller than its "    \
2966           "minimal size")                                                   \
2967                                                                             \
2968   develop(bool, TraceFrequencyInlining, false,                              \
2969           "Trace frequency based inlining")                                 \
2970                                                                             \
2971   develop_pd(bool, InlineIntrinsics,                                        \
2972           "Inline intrinsics that can be statically resolved")              \
2973                                                                             \
2974   product_pd(bool, ProfileInterpreter,                                      \
2975           "Profile at the bytecode level during interpretation")            \
2976                                                                             \
2977   develop(bool, TraceProfileInterpreter, false,                             \
2978           "Trace profiling at the bytecode level during interpretation. "   \
2979           "This outputs the profiling information collected to improve "    \
2980           "jit compilation.")                                               \
2981                                                                             \
2982   develop_pd(bool, ProfileTraps,                                            \
2983           "Profile deoptimization traps at the bytecode level")             \
2984                                                                             \
2985   product(intx, ProfileMaturityPercentage, 20,                              \
2986           "number of method invocations/branches (expressed as % of "       \
2987           "CompileThreshold) before using the method's profile")            \
2988           range(0, 100)                                                     \
2989                                                                             \
2990   diagnostic(bool, PrintMethodData, false,                                  \
2991           "Print the results of +ProfileInterpreter at end of run")         \
2992                                                                             \
2993   develop(bool, VerifyDataPointer, trueInDebug,                             \
2994           "Verify the method data pointer during interpreter profiling")    \
2995                                                                             \
2996   develop(bool, VerifyCompiledCode, false,                                  \
2997           "Include miscellaneous runtime verifications in nmethod code; "   \
2998           "default off because it disturbs nmethod size heuristics")        \
2999                                                                             \
3000   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
3001           "Manually make GC thread crash then dump java stack trace;  "     \
3002           "Test only")                                                      \
3003                                                                             \
3004   /* compilation */                                                         \
3005   product(bool, UseCompiler, true,                                          \
3006           "Use Just-In-Time compilation")                                   \
3007                                                                             \
3008   develop(bool, TraceCompilationPolicy, false,                              \
3009           "Trace compilation policy")                                       \
3010                                                                             \
3011   develop(bool, TimeCompilationPolicy, false,                               \
3012           "Time the compilation policy")                                    \
3013                                                                             \
3014   product(bool, UseCounterDecay, true,                                      \
3015           "Adjust recompilation counters")                                  \
3016                                                                             \
3017   develop(intx, CounterHalfLifeTime,    30,                                 \
3018           "Half-life time of invocation counters (in seconds)")             \
3019                                                                             \
3020   develop(intx, CounterDecayMinIntervalLength,   500,                       \
3021           "The minimum interval (in milliseconds) between invocation of "   \
3022           "CounterDecay")                                                   \
3023                                                                             \
3024   product(bool, AlwaysCompileLoopMethods, false,                            \
3025           "When using recompilation, never interpret methods "              \
3026           "containing loops")                                               \
3027                                                                             \
3028   product(bool, DontCompileHugeMethods, true,                               \
3029           "Do not compile methods > HugeMethodLimit")                       \
3030                                                                             \
3031   /* Bytecode escape analysis estimation. */                                \
3032   product(bool, EstimateArgEscape, true,                                    \
3033           "Analyze bytecodes to estimate escape state of arguments")        \
3034                                                                             \
3035   product(intx, BCEATraceLevel, 0,                                          \
3036           "How much tracing to do of bytecode escape analysis estimates")   \
3037                                                                             \
3038   product(intx, MaxBCEAEstimateLevel, 5,                                    \
3039           "Maximum number of nested calls that are analyzed by BC EA")      \
3040                                                                             \
3041   product(intx, MaxBCEAEstimateSize, 150,                                   \
3042           "Maximum bytecode size of a method to be analyzed by BC EA")      \
3043                                                                             \
3044   product(intx,  AllocatePrefetchStyle, 1,                                  \
3045           "0 = no prefetch, "                                               \
3046           "1 = prefetch instructions for each allocation, "                 \
3047           "2 = use TLAB watermark to gate allocation prefetch, "            \
3048           "3 = use BIS instruction on Sparc for allocation prefetch")       \
3049           range(0, 3)                                                       \
3050                                                                             \
3051   product(intx,  AllocatePrefetchDistance, -1,                              \
3052           "Distance to prefetch ahead of allocation pointer")               \
3053                                                                             \
3054   product(intx,  AllocatePrefetchLines, 3,                                  \
3055           "Number of lines to prefetch ahead of array allocation pointer")  \
3056                                                                             \
3057   product(intx,  AllocateInstancePrefetchLines, 1,                          \
3058           "Number of lines to prefetch ahead of instance allocation "       \
3059           "pointer")                                                        \
3060                                                                             \
3061   product(intx,  AllocatePrefetchStepSize, 16,                              \
3062           "Step size in bytes of sequential prefetch instructions")         \
3063                                                                             \
3064   product(intx,  AllocatePrefetchInstr, 0,                                  \
3065           "Prefetch instruction to prefetch ahead of allocation pointer")   \
3066                                                                             \
3067   /* deoptimization */                                                      \
3068   develop(bool, TraceDeoptimization, false,                                 \
3069           "Trace deoptimization")                                           \
3070                                                                             \
3071   develop(bool, DebugDeoptimization, false,                                 \
3072           "Tracing various information while debugging deoptimization")     \
3073                                                                             \
3074   product(intx, SelfDestructTimer, 0,                                       \
3075           "Will cause VM to terminate after a given time (in minutes) "     \
3076           "(0 means off)")                                                  \
3077                                                                             \
3078   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3079           "The maximum number of lines in the stack trace for Java "        \
3080           "exceptions (0 means all)")                                       \
3081                                                                             \
3082   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3083           "Guarantee a safepoint (at least) every so many milliseconds "    \
3084           "(0 means none)"))                                                \
3085                                                                             \
3086   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3087           "Guarantee a safepoint (at least) every so many milliseconds "    \
3088           "(0 means none)"))                                                \
3089                                                                             \
3090   product(intx, SafepointTimeoutDelay, 10000,                               \
3091           "Delay in milliseconds for option SafepointTimeout")              \
3092                                                                             \
3093   product(intx, NmethodSweepActivity, 10,                                   \
3094           "Removes cold nmethods from code cache if > 0. Higher values "    \
3095           "result in more aggressive sweeping")                             \
3096           range(0, 2000)                                                    \
3097                                                                             \
3098   notproduct(bool, LogSweeper, false,                                       \
3099           "Keep a ring buffer of sweeper activity")                         \
3100                                                                             \
3101   notproduct(intx, SweeperLogEntries, 1024,                                 \
3102           "Number of records in the ring buffer of sweeper activity")       \
3103                                                                             \
3104   notproduct(intx, MemProfilingInterval, 500,                               \
3105           "Time between each invocation of the MemProfiler")                \
3106                                                                             \
3107   develop(intx, MallocCatchPtr, -1,                                         \
3108           "Hit breakpoint when mallocing/freeing this pointer")             \
3109                                                                             \
3110   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3111           "List of assertions (file:line) to muzzle")                       \
3112                                                                             \
3113   notproduct(size_t, HandleAllocationLimit, 1024,                           \
3114           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3115           "is used")                                                        \
3116                                                                             \
3117   develop(size_t, TotalHandleAllocationLimit, 1024,                         \
3118           "Threshold for total handle allocation when "                     \
3119           "+TraceHandleAllocation is used")                                 \
3120                                                                             \
3121   develop(intx, StackPrintLimit, 100,                                       \
3122           "number of stack frames to print in VM-level stack dump")         \
3123                                                                             \
3124   notproduct(intx, MaxElementPrintSize, 256,                                \
3125           "maximum number of elements to print")                            \
3126                                                                             \
3127   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3128           "maximum number of subklasses to print when printing klass")      \
3129                                                                             \
3130   product(intx, MaxInlineLevel, 9,                                          \
3131           "maximum number of nested calls that are inlined")                \
3132                                                                             \
3133   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3134           "maximum number of nested recursive calls that are inlined")      \
3135                                                                             \
3136   develop(intx, MaxForceInlineLevel, 100,                                   \
3137           "maximum number of nested calls that are forced for inlining "    \
3138           "(using CompileCommand or marked w/ @ForceInline)")               \
3139                                                                             \
3140   product_pd(intx, InlineSmallCode,                                         \
3141           "Only inline already compiled methods if their code size is "     \
3142           "less than this")                                                 \
3143                                                                             \
3144   product(intx, MaxInlineSize, 35,                                          \
3145           "The maximum bytecode size of a method to be inlined")            \
3146                                                                             \
3147   product_pd(intx, FreqInlineSize,                                          \
3148           "The maximum bytecode size of a frequent method to be inlined")   \
3149                                                                             \
3150   product(intx, MaxTrivialSize, 6,                                          \
3151           "The maximum bytecode size of a trivial method to be inlined")    \
3152                                                                             \
3153   product(intx, MinInliningThreshold, 250,                                  \
3154           "The minimum invocation count a method needs to have to be "      \
3155           "inlined")                                                        \
3156                                                                             \
3157   develop(intx, MethodHistogramCutoff, 100,                                 \
3158           "The cutoff value for method invocation histogram (+CountCalls)") \
3159                                                                             \
3160   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3161           "Number of interpreted methods to show in profile")               \
3162                                                                             \
3163   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3164           "Number of compiled methods to show in profile")                  \
3165                                                                             \
3166   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3167           "Number of stub methods to show in profile")                      \
3168                                                                             \
3169   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3170           "Number of runtime stub nodes to show in profile")                \
3171                                                                             \
3172   product(intx, ProfileIntervalsTicks, 100,                                 \
3173           "Number of ticks between printing of interval profile "           \
3174           "(+ProfileIntervals)")                                            \
3175                                                                             \
3176   notproduct(intx, ScavengeALotInterval,     1,                             \
3177           "Interval between which scavenge will occur with +ScavengeALot")  \
3178                                                                             \
3179   notproduct(intx, FullGCALotInterval,     1,                               \
3180           "Interval between which full gc will occur with +FullGCALot")     \
3181                                                                             \
3182   notproduct(intx, FullGCALotStart,     0,                                  \
3183           "For which invocation to start FullGCAlot")                       \
3184                                                                             \
3185   notproduct(intx, FullGCALotDummies,  32*K,                                \
3186           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3187           "to move")                                                        \
3188                                                                             \
3189   develop(intx, DontYieldALotInterval,    10,                               \
3190           "Interval between which yields will be dropped (milliseconds)")   \
3191                                                                             \
3192   develop(intx, MinSleepInterval,     1,                                    \
3193           "Minimum sleep() interval (milliseconds) when "                   \
3194           "ConvertSleepToYield is off (used for Solaris)")                  \
3195                                                                             \
3196   develop(intx, ProfilerPCTickThreshold,    15,                             \
3197           "Number of ticks in a PC buckets to be a hotspot")                \
3198                                                                             \
3199   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3200           "Number of exits until DeoptimizeALot kicks in")                  \
3201                                                                             \
3202   notproduct(intx, ZombieALotInterval,     5,                               \
3203           "Number of exits until ZombieALot kicks in")                      \
3204                                                                             \
3205   diagnostic(intx, MallocVerifyInterval,     0,                             \
3206           "If non-zero, verify C heap after every N calls to "              \
3207           "malloc/realloc/free")                                            \
3208                                                                             \
3209   diagnostic(intx, MallocVerifyStart,     0,                                \
3210           "If non-zero, start verifying C heap after Nth call to "          \
3211           "malloc/realloc/free")                                            \
3212                                                                             \
3213   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3214           "If non-zero, maximum number of words that malloc/realloc can "   \
3215           "allocate (for testing only)")                                    \
3216                                                                             \
3217   product(intx, TypeProfileWidth,     2,                                    \
3218           "Number of receiver types to record in call/cast profile")        \
3219                                                                             \
3220   develop(intx, BciProfileWidth,      2,                                    \
3221           "Number of return bci's to record in ret profile")                \
3222                                                                             \
3223   product(intx, PerMethodRecompilationCutoff, 400,                          \
3224           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3225           range(-1, max_intx)                                               \
3226                                                                             \
3227   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3228           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3229           range(-1, max_intx)                                               \
3230                                                                             \
3231   product(intx, PerMethodTrapLimit,  100,                                   \
3232           "Limit on traps (of one kind) in a method (includes inlines)")    \
3233                                                                             \
3234   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3235           "Limit on speculative traps (of one kind) in a method "           \
3236           "(includes inlines)")                                             \
3237                                                                             \
3238   product(intx, PerBytecodeTrapLimit,  4,                                   \
3239           "Limit on traps (of one kind) at a particular BCI")               \
3240                                                                             \
3241   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3242           "Extra method data trap entries for speculation")                 \
3243                                                                             \
3244   develop(intx, InlineFrequencyRatio,    20,                                \
3245           "Ratio of call site execution to caller method invocation")       \
3246                                                                             \
3247   develop_pd(intx, InlineFrequencyCount,                                    \
3248           "Count of call site execution necessary to trigger frequent "     \
3249           "inlining")                                                       \
3250                                                                             \
3251   develop(intx, InlineThrowCount,    50,                                    \
3252           "Force inlining of interpreted methods that throw this often")    \
3253                                                                             \
3254   develop(intx, InlineThrowMaxSize,   200,                                  \
3255           "Force inlining of throwing methods smaller than this")           \
3256                                                                             \
3257   develop(intx, ProfilerNodeSize,  1024,                                    \
3258           "Size in K to allocate for the Profile Nodes of each thread")     \
3259                                                                             \
3260   /* gc parameters */                                                       \
3261   product(size_t, InitialHeapSize, 0,                                       \
3262           "Initial heap size (in bytes); zero means use ergonomics")        \
3263                                                                             \
3264   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3265           "Maximum heap size (in bytes)")                                   \
3266                                                                             \
3267   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3268           "Initial tenured generation size (in bytes)")                     \
3269                                                                             \
3270   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3271           "Initial new generation size (in bytes)")                         \
3272                                                                             \
3273   product(size_t, MaxNewSize, max_uintx,                                    \
3274           "Maximum new generation size (in bytes), max_uintx means set "    \
3275           "ergonomically")                                                  \
3276                                                                             \
3277   product(size_t, PretenureSizeThreshold, 0,                                \
3278           "Maximum size in bytes of objects allocated in DefNew "           \
3279           "generation; zero means no maximum")                              \
3280                                                                             \
3281   product(size_t, TLABSize, 0,                                              \
3282           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3283                                                                             \
3284   product(size_t, MinTLABSize, 2*K,                                         \
3285           "Minimum allowed TLAB size (in bytes)")                           \
3286           range(1, max_uintx)                                               \
3287                                                                             \
3288   product(uintx, TLABAllocationWeight, 35,                                  \
3289           "Allocation averaging weight")                                    \
3290           range(0, 100)                                                     \
3291                                                                             \
3292   /* Limit the lower bound of this flag to 1 as it is used  */              \
3293   /* in a division expression.                              */              \
3294   product(uintx, TLABWasteTargetPercent, 1,                                 \
3295           "Percentage of Eden that can be wasted")                          \
3296           range(1, 100)                                                     \
3297                                                                             \
3298   product(uintx, TLABRefillWasteFraction,    64,                            \
3299           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3300           range(1, max_uintx)                                               \
3301                                                                             \
3302   product(uintx, TLABWasteIncrement,    4,                                  \
3303           "Increment allowed waste at slow allocation")                     \
3304                                                                             \
3305   product(uintx, SurvivorRatio, 8,                                          \
3306           "Ratio of eden/survivor space size")                              \
3307                                                                             \
3308   product(uintx, NewRatio, 2,                                               \
3309           "Ratio of old/new generation sizes")                              \
3310                                                                             \
3311   product_pd(size_t, NewSizeThreadIncrease,                                 \
3312           "Additional size added to desired new generation size per "       \
3313           "non-daemon thread (in bytes)")                                   \
3314                                                                             \
3315   product_pd(size_t, MetaspaceSize,                                         \
3316           "Initial size of Metaspaces (in bytes)")                          \
3317                                                                             \
3318   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3319           "Maximum size of Metaspaces (in bytes)")                          \
3320                                                                             \
3321   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3322           "Maximum size of class area in Metaspace when compressed "        \
3323           "class pointers are used")                                        \
3324           range(1*M, 3*G)                                                   \
3325                                                                             \
3326   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3327           "The minimum percentage of heap free after GC to avoid expansion."\
3328           " For most GCs this applies to the old generation. In G1 and"     \
3329           " ParallelGC it applies to the whole heap.")                      \
3330           range(0, 100)                                                     \
3331           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3332                                                                             \
3333   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3334           "The maximum percentage of heap free after GC to avoid shrinking."\
3335           " For most GCs this applies to the old generation. In G1 and"     \
3336           " ParallelGC it applies to the whole heap.")                      \
3337           range(0, 100)                                                     \
3338           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3339                                                                             \
3340   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3341           "Number of milliseconds per MB of free space in the heap")        \
3342                                                                             \
3343   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3344           "The minimum change in heap space due to GC (in bytes)")          \
3345                                                                             \
3346   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3347           "The minimum expansion of Metaspace (in bytes)")                  \
3348                                                                             \
3349   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3350           "The maximum percentage of Metaspace free after GC to avoid "     \
3351           "shrinking")                                                      \
3352           range(0, 100)                                                     \
3353           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3354                                                                             \
3355   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3356           "The minimum percentage of Metaspace free after GC to avoid "     \
3357           "expansion")                                                      \
3358           range(0, 99)                                                      \
3359           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3360                                                                             \
3361   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3362           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3363                                                                             \
3364   product(uintx, QueuedAllocationWarningCount, 0,                           \
3365           "Number of times an allocation that queues behind a GC "          \
3366           "will retry before printing a warning")                           \
3367                                                                             \
3368   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3369           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3370                                                                             \
3371   diagnostic(intx, VerifyGCLevel,     0,                                    \
3372           "Generation level at which to start +VerifyBefore/AfterGC")       \
3373                                                                             \
3374   product(uintx, MaxTenuringThreshold,    15,                               \
3375           "Maximum value for tenuring threshold")                           \
3376           range(0, markOopDesc::max_age + 1)                                \
3377           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3378                                                                             \
3379   product(uintx, InitialTenuringThreshold,    7,                            \
3380           "Initial value for tenuring threshold")                           \
3381           range(0, markOopDesc::max_age + 1)                                \
3382           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3383                                                                             \
3384   product(uintx, TargetSurvivorRatio,    50,                                \
3385           "Desired percentage of survivor space used after scavenge")       \
3386           range(0, 100)                                                     \
3387                                                                             \
3388   product(uintx, MarkSweepDeadRatio,     5,                                 \
3389           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3390           "Serial mark sweep treats this as both the minimum and maximum "  \
3391           "value. "                                                         \
3392           "CMS uses this value only if it falls back to mark sweep. "       \
3393           "Par compact uses a variable scale based on the density of the "  \
3394           "generation and treats this as the maximum value when the heap "  \
3395           "is either completely full or completely empty.  Par compact "    \
3396           "also has a smaller default value; see arguments.cpp.")           \
3397           range(0, 100)                                                     \
3398                                                                             \
3399   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3400           "How often should we fully compact the heap (ignoring the dead "  \
3401           "space parameters)")                                              \
3402           range(1, max_uintx)                                               \
3403                                                                             \
3404   product(intx, PrintCMSStatistics, 0,                                      \
3405           "Statistics for CMS")                                             \
3406                                                                             \
3407   product(bool, PrintCMSInitiationStatistics, false,                        \
3408           "Statistics for initiating a CMS collection")                     \
3409                                                                             \
3410   product(intx, PrintFLSStatistics, 0,                                      \
3411           "Statistics for CMS' FreeListSpace")                              \
3412                                                                             \
3413   product(intx, PrintFLSCensus, 0,                                          \
3414           "Census for CMS' FreeListSpace")                                  \
3415                                                                             \
3416   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3417           "Delay between expansion and allocation (in milliseconds)")       \
3418                                                                             \
3419   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3420           "Delay in scheduling GC workers (in milliseconds)")               \
3421                                                                             \
3422   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3423           "(Unstable) Number of times to iterate in safepoint loop "        \
3424           "before blocking VM threads ")                                    \
3425                                                                             \
3426   product(intx, DeferPollingPageLoopCount,     -1,                          \
3427           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3428           "before changing safepoint polling page to RO ")                  \
3429                                                                             \
3430   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3431                                                                             \
3432   product(bool, PSChunkLargeArrays, true,                                   \
3433           "Process large arrays in chunks")                                 \
3434                                                                             \
3435   product(uintx, GCDrainStackTargetSize, 64,                                \
3436           "Number of entries we will try to leave on the stack "            \
3437           "during parallel gc")                                             \
3438                                                                             \
3439   /* stack parameters */                                                    \
3440   product_pd(intx, StackYellowPages,                                        \
3441           "Number of yellow zone (recoverable overflows) pages")            \
3442           range(1, max_intx)                                                \
3443                                                                             \
3444   product_pd(intx, StackRedPages,                                           \
3445           "Number of red zone (unrecoverable overflows) pages")             \
3446           range(1, max_intx)                                                \
3447                                                                             \
3448   /* greater stack shadow pages can't generate instruction to bang stack */ \
3449   product_pd(intx, StackShadowPages,                                        \
3450           "Number of shadow zone (for overflow checking) pages "            \
3451           "this should exceed the depth of the VM and native call stack")   \
3452           range(1, 50)                                                      \
3453                                                                             \
3454   product_pd(intx, ThreadStackSize,                                         \
3455           "Thread Stack Size (in Kbytes)")                                  \
3456                                                                             \
3457   product_pd(intx, VMThreadStackSize,                                       \
3458           "Non-Java Thread Stack Size (in Kbytes)")                         \
3459                                                                             \
3460   product_pd(intx, CompilerThreadStackSize,                                 \
3461           "Compiler Thread Stack Size (in Kbytes)")                         \
3462                                                                             \
3463   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3464           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3465                                                                             \
3466   /* code cache parameters                                    */            \
3467   /* ppc64/tiered compilation has large code-entry alignment. */            \
3468   develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3469           "Code cache segment size (in bytes) - smallest unit of "          \
3470           "allocation")                                                     \
3471           range(1, 1024)                                                    \
3472                                                                             \
3473   develop_pd(intx, CodeEntryAlignment,                                      \
3474           "Code entry alignment for generated code (in bytes)")             \
3475                                                                             \
3476   product_pd(intx, OptoLoopAlignment,                                       \
3477           "Align inner loops to zero relative to this modulus")             \
3478                                                                             \
3479   product_pd(uintx, InitialCodeCacheSize,                                   \
3480           "Initial code cache size (in bytes)")                             \
3481                                                                             \
3482   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3483           "Minimum code cache size (in bytes) required to start VM.")       \
3484                                                                             \
3485   product(bool, SegmentedCodeCache, false,                                  \
3486           "Use a segmented code cache")                                     \
3487                                                                             \
3488   product_pd(uintx, ReservedCodeCacheSize,                                  \
3489           "Reserved code cache size (in bytes) - maximum code cache size")  \
3490                                                                             \
3491   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3492           "Size of code heap with non-profiled methods (in bytes)")         \
3493                                                                             \
3494   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3495           "Size of code heap with profiled methods (in bytes)")             \
3496                                                                             \
3497   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3498           "Size of code heap with non-nmethods (in bytes)")                 \
3499                                                                             \
3500   product_pd(uintx, CodeCacheExpansionSize,                                 \
3501           "Code cache expansion size (in bytes)")                           \
3502                                                                             \
3503   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3504           "Minimum number of segments in a code cache block")               \
3505           range(1, 100)                                                     \
3506                                                                             \
3507   notproduct(bool, ExitOnFullCodeCache, false,                              \
3508           "Exit the VM if we fill the code cache")                          \
3509                                                                             \
3510   product(bool, UseCodeCacheFlushing, true,                                 \
3511           "Remove cold/old nmethods from the code cache")                   \
3512                                                                             \
3513   product(uintx, StartAggressiveSweepingAt, 10,                             \
3514           "Start aggressive sweeping if X[%] of the code cache is free."    \
3515           "Segmented code cache: X[%] of the non-profiled heap."            \
3516           "Non-segmented code cache: X[%] of the total code cache")         \
3517           range(0, 100)                                                     \
3518                                                                             \
3519   /* interpreter debugging */                                               \
3520   develop(intx, BinarySwitchThreshold, 5,                                   \
3521           "Minimal number of lookupswitch entries for rewriting to binary " \
3522           "switch")                                                         \
3523                                                                             \
3524   develop(intx, StopInterpreterAt, 0,                                       \
3525           "Stop interpreter execution at specified bytecode number")        \
3526                                                                             \
3527   develop(intx, TraceBytecodesAt, 0,                                        \
3528           "Trace bytecodes starting with specified bytecode number")        \
3529                                                                             \
3530   /* compiler interface */                                                  \
3531   develop(intx, CIStart, 0,                                                 \
3532           "The id of the first compilation to permit")                      \
3533                                                                             \
3534   develop(intx, CIStop, max_jint,                                           \
3535           "The id of the last compilation to permit")                       \
3536                                                                             \
3537   develop(intx, CIStartOSR, 0,                                              \
3538           "The id of the first osr compilation to permit "                  \
3539           "(CICountOSR must be on)")                                        \
3540                                                                             \
3541   develop(intx, CIStopOSR, max_jint,                                        \
3542           "The id of the last osr compilation to permit "                   \
3543           "(CICountOSR must be on)")                                        \
3544                                                                             \
3545   develop(intx, CIBreakAtOSR, -1,                                           \
3546           "The id of osr compilation to break at")                          \
3547                                                                             \
3548   develop(intx, CIBreakAt, -1,                                              \
3549           "The id of compilation to break at")                              \
3550                                                                             \
3551   product(ccstrlist, CompileOnly, "",                                       \
3552           "List of methods (pkg/class.name) to restrict compilation to")    \
3553                                                                             \
3554   product(ccstr, CompileCommandFile, NULL,                                  \
3555           "Read compiler commands from this file [.hotspot_compiler]")      \
3556                                                                             \
3557   product(ccstr, CompilerDirectivesFile, NULL,                              \
3558           "Read compiler directives from this file")                        \
3559                                                                             \
3560   product(ccstrlist, CompileCommand, "",                                    \
3561           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3562                                                                             \
3563   develop(bool, ReplayCompiles, false,                                      \
3564           "Enable replay of compilations from ReplayDataFile")              \
3565                                                                             \
3566   product(ccstr, ReplayDataFile, NULL,                                      \
3567           "File containing compilation replay information"                  \
3568           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3569                                                                             \
3570    product(ccstr, InlineDataFile, NULL,                                     \
3571           "File containing inlining replay information"                     \
3572           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3573                                                                             \
3574   develop(intx, ReplaySuppressInitializers, 2,                              \
3575           "Control handling of class initialization during replay: "        \
3576           "0 - don't do anything special; "                                 \
3577           "1 - treat all class initializers as empty; "                     \
3578           "2 - treat class initializers for application classes as empty; " \
3579           "3 - allow all class initializers to run during bootstrap but "   \
3580           "    pretend they are empty after starting replay")               \
3581           range(0, 3)                                                       \
3582                                                                             \
3583   develop(bool, ReplayIgnoreInitErrors, false,                              \
3584           "Ignore exceptions thrown during initialization for replay")      \
3585                                                                             \
3586   product(bool, DumpReplayDataOnError, true,                                \
3587           "Record replay data for crashing compiler threads")               \
3588                                                                             \
3589   product(bool, CICompilerCountPerCPU, false,                               \
3590           "1 compiler thread for log(N CPUs)")                              \
3591                                                                             \
3592   develop(intx, CIFireOOMAt,    -1,                                         \
3593           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3594           "(non-negative value throws OOM after this many CI accesses "     \
3595           "in each compile)")                                               \
3596   notproduct(intx, CICrashAt, -1,                                           \
3597           "id of compilation to trigger assert in compiler thread for "     \
3598           "the purpose of testing, e.g. generation of replay data")         \
3599   notproduct(bool, CIObjectFactoryVerify, false,                            \
3600           "enable potentially expensive verification in ciObjectFactory")   \
3601                                                                             \
3602   /* Priorities */                                                          \
3603   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3604                                                                             \
3605   product(intx, ThreadPriorityPolicy, 0,                                    \
3606           "0 : Normal.                                                     "\
3607           "    VM chooses priorities that are appropriate for normal       "\
3608           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3609           "    to normal native priority. Java priorities below "           \
3610           "    NORM_PRIORITY map to lower native priority values. On       "\
3611           "    Windows applications are allowed to use higher native       "\
3612           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3613           "    not use the highest possible native priority,               "\
3614           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3615           "    system threads. On Linux thread priorities are ignored      "\
3616           "    because the OS does not support static priority in          "\
3617           "    SCHED_OTHER scheduling class which is the only choice for   "\
3618           "    non-root, non-realtime applications.                        "\
3619           "1 : Aggressive.                                                 "\
3620           "    Java thread priorities map over to the entire range of      "\
3621           "    native thread priorities. Higher Java thread priorities map "\
3622           "    to higher native thread priorities. This policy should be   "\
3623           "    used with care, as sometimes it can cause performance       "\
3624           "    degradation in the application and/or the entire system. On "\
3625           "    Linux this policy requires root privilege.")                 \
3626           range(0, 1)                                                       \
3627                                                                             \
3628   product(bool, ThreadPriorityVerbose, false,                               \
3629           "Print priority changes")                                         \
3630                                                                             \
3631   product(intx, CompilerThreadPriority, -1,                                 \
3632           "The native priority at which compiler threads should run "       \
3633           "(-1 means no change)")                                           \
3634                                                                             \
3635   product(intx, VMThreadPriority, -1,                                       \
3636           "The native priority at which the VM thread should run "          \
3637           "(-1 means no change)")                                           \
3638                                                                             \
3639   product(bool, CompilerThreadHintNoPreempt, true,                          \
3640           "(Solaris only) Give compiler threads an extra quanta")           \
3641                                                                             \
3642   product(bool, VMThreadHintNoPreempt, false,                               \
3643           "(Solaris only) Give VM thread an extra quanta")                  \
3644                                                                             \
3645   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3646           "Map Java priorities to OS priorities")                           \
3647                                                                             \
3648   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3649           "Map Java priorities to OS priorities")                           \
3650                                                                             \
3651   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3652           "Map Java priorities to OS priorities")                           \
3653                                                                             \
3654   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3655           "Map Java priorities to OS priorities")                           \
3656                                                                             \
3657   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3658           "Map Java priorities to OS priorities")                           \
3659                                                                             \
3660   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3661           "Map Java priorities to OS priorities")                           \
3662                                                                             \
3663   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3664           "Map Java priorities to OS priorities")                           \
3665                                                                             \
3666   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3667           "Map Java priorities to OS priorities")                           \
3668                                                                             \
3669   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3670           "Map Java priorities to OS priorities")                           \
3671                                                                             \
3672   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3673           "Map Java priorities to OS priorities")                           \
3674                                                                             \
3675   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3676           "Java thread priority 10 maps to critical scheduling priority")   \
3677                                                                             \
3678   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3679           "Compiler thread(s) run at critical scheduling priority")         \
3680                                                                             \
3681   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3682           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3683                                                                             \
3684   /* compiler debugging */                                                  \
3685   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3686           "First class to consider when using +CompileTheWorld")            \
3687                                                                             \
3688   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3689           "Last class to consider when using +CompileTheWorld")             \
3690                                                                             \
3691   develop(intx, NewCodeParameter,      0,                                   \
3692           "Testing Only: Create a dedicated integer parameter before "      \
3693           "putback")                                                        \
3694                                                                             \
3695   /* new oopmap storage allocation */                                       \
3696   develop(intx, MinOopMapAllocation,     8,                                 \
3697           "Minimum number of OopMap entries in an OopMapSet")               \
3698                                                                             \
3699   /* Background Compilation */                                              \
3700   develop(intx, LongCompileThreshold,     50,                               \
3701           "Used with +TraceLongCompiles")                                   \
3702                                                                             \
3703   /* recompilation */                                                       \
3704   product_pd(intx, CompileThreshold,                                        \
3705           "number of interpreted method invocations before (re-)compiling") \
3706                                                                             \
3707   product(double, CompileThresholdScaling, 1.0,                             \
3708           "Factor to control when first compilation happens "               \
3709           "(both with and without tiered compilation): "                    \
3710           "values greater than 1.0 delay counter overflow, "                \
3711           "values between 0 and 1.0 rush counter overflow, "                \
3712           "value of 1.0 leaves compilation thresholds unchanged "           \
3713           "value of 0.0 is equivalent to -Xint. "                           \
3714           ""                                                                \
3715           "Flag can be set as per-method option. "                          \
3716           "If a value is specified for a method, compilation thresholds "   \
3717           "for that method are scaled by both the value of the global flag "\
3718           "and the value of the per-method flag.")                          \
3719                                                                             \
3720   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3721           "Interpreter (tier 0) invocation notification frequency")         \
3722                                                                             \
3723   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3724           "C1 without MDO (tier 2) invocation notification frequency")      \
3725                                                                             \
3726   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3727           "C1 with MDO profiling (tier 3) invocation notification "         \
3728           "frequency")                                                      \
3729                                                                             \
3730   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3731           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3732                                                                             \
3733   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3734           "Interpreter (tier 0) invocation notification frequency")         \
3735                                                                             \
3736   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3737           "C1 without MDO (tier 2) invocation notification frequency")      \
3738                                                                             \
3739   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3740           "C1 with MDO profiling (tier 3) invocation notification "         \
3741           "frequency")                                                      \
3742                                                                             \
3743   product(intx, Tier2CompileThreshold, 0,                                   \
3744           "threshold at which tier 2 compilation is invoked")               \
3745                                                                             \
3746   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3747           "Back edge threshold at which tier 2 compilation is invoked")     \
3748                                                                             \
3749   product(intx, Tier3InvocationThreshold, 200,                              \
3750           "Compile if number of method invocations crosses this "           \
3751           "threshold")                                                      \
3752                                                                             \
3753   product(intx, Tier3MinInvocationThreshold, 100,                           \
3754           "Minimum invocation to compile at tier 3")                        \
3755                                                                             \
3756   product(intx, Tier3CompileThreshold, 2000,                                \
3757           "Threshold at which tier 3 compilation is invoked (invocation "   \
3758           "minimum must be satisfied")                                      \
3759                                                                             \
3760   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3761           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3762                                                                             \
3763   product(intx, Tier4InvocationThreshold, 5000,                             \
3764           "Compile if number of method invocations crosses this "           \
3765           "threshold")                                                      \
3766                                                                             \
3767   product(intx, Tier4MinInvocationThreshold, 600,                           \
3768           "Minimum invocation to compile at tier 4")                        \
3769                                                                             \
3770   product(intx, Tier4CompileThreshold, 15000,                               \
3771           "Threshold at which tier 4 compilation is invoked (invocation "   \
3772           "minimum must be satisfied")                                      \
3773                                                                             \
3774   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3775           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3776                                                                             \
3777   product(intx, Tier3DelayOn, 5,                                            \
3778           "If C2 queue size grows over this amount per compiler thread "    \
3779           "stop compiling at tier 3 and start compiling at tier 2")         \
3780                                                                             \
3781   product(intx, Tier3DelayOff, 2,                                           \
3782           "If C2 queue size is less than this amount per compiler thread "  \
3783           "allow methods compiled at tier 2 transition to tier 3")          \
3784                                                                             \
3785   product(intx, Tier3LoadFeedback, 5,                                       \
3786           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3787           "reaches this amount per compiler thread")                        \
3788                                                                             \
3789   product(intx, Tier4LoadFeedback, 3,                                       \
3790           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3791           "reaches this amount per compiler thread")                        \
3792                                                                             \
3793   product(intx, TieredCompileTaskTimeout, 50,                               \
3794           "Kill compile task if method was not used within "                \
3795           "given timeout in milliseconds")                                  \
3796                                                                             \
3797   product(intx, TieredStopAtLevel, 4,                                       \
3798           "Stop at given compilation level")                                \
3799                                                                             \
3800   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3801           "Start profiling in interpreter if the counters exceed tier 3 "   \
3802           "thresholds by the specified percentage")                         \
3803                                                                             \
3804   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3805           "Increase the compile threshold for C1 compilation if the code "  \
3806           "cache is filled by the specified percentage")                    \
3807           range(0, 99)                                                      \
3808                                                                             \
3809   product(intx, TieredRateUpdateMinTime, 1,                                 \
3810           "Minimum rate sampling interval (in milliseconds)")               \
3811                                                                             \
3812   product(intx, TieredRateUpdateMaxTime, 25,                                \
3813           "Maximum rate sampling interval (in milliseconds)")               \
3814                                                                             \
3815   product_pd(bool, TieredCompilation,                                       \
3816           "Enable tiered compilation")                                      \
3817                                                                             \
3818   product(bool, PrintTieredEvents, false,                                   \
3819           "Print tiered events notifications")                              \
3820                                                                             \
3821   product_pd(intx, OnStackReplacePercentage,                                \
3822           "NON_TIERED number of method invocations/branches (expressed as " \
3823           "% of CompileThreshold) before (re-)compiling OSR code")          \
3824                                                                             \
3825   product(intx, InterpreterProfilePercentage, 33,                           \
3826           "NON_TIERED number of method invocations/branches (expressed as " \
3827           "% of CompileThreshold) before profiling in the interpreter")     \
3828           range(0, 100)                                                     \
3829                                                                             \
3830   develop(intx, MaxRecompilationSearchLength,    10,                        \
3831           "The maximum number of frames to inspect when searching for "     \
3832           "recompilee")                                                     \
3833                                                                             \
3834   develop(intx, MaxInterpretedSearchLength,     3,                          \
3835           "The maximum number of interpreted frames to skip when searching "\
3836           "for recompilee")                                                 \
3837                                                                             \
3838   develop(intx, DesiredMethodLimit,  8000,                                  \
3839           "The desired maximum method size (in bytecodes) after inlining")  \
3840                                                                             \
3841   develop(intx, HugeMethodLimit,  8000,                                     \
3842           "Don't compile methods larger than this if "                      \
3843           "+DontCompileHugeMethods")                                        \
3844                                                                             \
3845   /* New JDK 1.4 reflection implementation */                               \
3846                                                                             \
3847   develop(intx, FastSuperclassLimit, 8,                                     \
3848           "Depth of hardwired instanceof accelerator array")                \
3849                                                                             \
3850   /* Properties for Java libraries  */                                      \
3851                                                                             \
3852   product(size_t, MaxDirectMemorySize, 0,                                   \
3853           "Maximum total size of NIO direct-buffer allocations")            \
3854                                                                             \
3855   /* Flags used for temporary code during development  */                   \
3856                                                                             \
3857   diagnostic(bool, UseNewCode, false,                                       \
3858           "Testing Only: Use the new version while testing")                \
3859                                                                             \
3860   diagnostic(bool, UseNewCode2, false,                                      \
3861           "Testing Only: Use the new version while testing")                \
3862                                                                             \
3863   diagnostic(bool, UseNewCode3, false,                                      \
3864           "Testing Only: Use the new version while testing")                \
3865                                                                             \
3866   /* flags for performance data collection */                               \
3867                                                                             \
3868   product(bool, UsePerfData, falseInEmbedded,                               \
3869           "Flag to disable jvmstat instrumentation for performance testing "\
3870           "and problem isolation purposes")                                 \
3871                                                                             \
3872   product(bool, PerfDataSaveToFile, false,                                  \
3873           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3874                                                                             \
3875   product(ccstr, PerfDataSaveFile, NULL,                                    \
3876           "Save PerfData memory to the specified absolute pathname. "       \
3877           "The string %p in the file name (if present) "                    \
3878           "will be replaced by pid")                                        \
3879                                                                             \
3880   product(intx, PerfDataSamplingInterval, 50,                               \
3881           "Data sampling interval (in milliseconds)")                       \
3882                                                                             \
3883   develop(bool, PerfTraceDataCreation, false,                               \
3884           "Trace creation of Performance Data Entries")                     \
3885                                                                             \
3886   develop(bool, PerfTraceMemOps, false,                                     \
3887           "Trace PerfMemory create/attach/detach calls")                    \
3888                                                                             \
3889   product(bool, PerfDisableSharedMem, false,                                \
3890           "Store performance data in standard memory")                      \
3891                                                                             \
3892   product(intx, PerfDataMemorySize, 64*K,                                   \
3893           "Size of performance data memory region. Will be rounded "        \
3894           "up to a multiple of the native os page size.")                   \
3895                                                                             \
3896   product(intx, PerfMaxStringConstLength, 1024,                             \
3897           "Maximum PerfStringConstant string length before truncation")     \
3898                                                                             \
3899   product(bool, PerfAllowAtExitRegistration, false,                         \
3900           "Allow registration of atexit() methods")                         \
3901                                                                             \
3902   product(bool, PerfBypassFileSystemCheck, false,                           \
3903           "Bypass Win32 file system criteria checks (Windows Only)")        \
3904                                                                             \
3905   product(intx, UnguardOnExecutionViolation, 0,                             \
3906           "Unguard page and retry on no-execute fault (Win32 only) "        \
3907           "0=off, 1=conservative, 2=aggressive")                            \
3908           range(0, 2)                                                       \
3909                                                                             \
3910   /* Serviceability Support */                                              \
3911                                                                             \
3912   product(bool, ManagementServer, false,                                    \
3913           "Create JMX Management Server")                                   \
3914                                                                             \
3915   product(bool, DisableAttachMechanism, false,                              \
3916           "Disable mechanism that allows tools to attach to this VM")       \
3917                                                                             \
3918   product(bool, StartAttachListener, false,                                 \
3919           "Always start Attach Listener at VM startup")                     \
3920                                                                             \
3921   manageable(bool, PrintConcurrentLocks, false,                             \
3922           "Print java.util.concurrent locks in thread dump")                \
3923                                                                             \
3924   product(bool, TransmitErrorReport, false,                                 \
3925           "Enable error report transmission on erroneous termination")      \
3926                                                                             \
3927   product(ccstr, ErrorReportServer, NULL,                                   \
3928           "Override built-in error report server address")                  \
3929                                                                             \
3930   /* Shared spaces */                                                       \
3931                                                                             \
3932   product(bool, UseSharedSpaces, true,                                      \
3933           "Use shared spaces for metadata")                                 \
3934                                                                             \
3935   product(bool, VerifySharedSpaces, false,                                  \
3936           "Verify shared spaces (false for default archive, true for "      \
3937           "archive specified by -XX:SharedArchiveFile)")                    \
3938                                                                             \
3939   product(bool, RequireSharedSpaces, false,                                 \
3940           "Require shared spaces for metadata")                             \
3941                                                                             \
3942   product(bool, DumpSharedSpaces, false,                                    \
3943           "Special mode: JVM reads a class list, loads classes, builds "    \
3944           "shared spaces, and dumps the shared spaces to a file to be "     \
3945           "used in future JVM runs")                                        \
3946                                                                             \
3947   product(bool, PrintSharedSpaces, false,                                   \
3948           "Print usage of shared spaces")                                   \
3949                                                                             \
3950   product(bool, PrintSharedArchiveAndExit, false,                           \
3951           "Print shared archive file contents")                             \
3952                                                                             \
3953   product(bool, PrintSharedDictionary, false,                               \
3954           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3955           "dictionary")                                                     \
3956                                                                             \
3957   product(size_t, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),     \
3958           "Size of read-write space for metadata (in bytes)")               \
3959                                                                             \
3960   product(size_t, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3961           "Size of read-only space for metadata (in bytes)")                \
3962                                                                             \
3963   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3964           "Size of the shared miscellaneous data area (in bytes)")          \
3965                                                                             \
3966   product(uintx, SharedMiscCodeSize,    120*K,                              \
3967           "Size of the shared miscellaneous code area (in bytes)")          \
3968                                                                             \
3969   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3970           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3971           "Address to allocate shared memory region for class data")        \
3972                                                                             \
3973   product(uintx, SharedSymbolTableBucketSize, 4,                            \
3974           "Average number of symbols per bucket in shared table")           \
3975                                                                             \
3976   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3977           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3978           "classes. Just exclude them from the shared dictionary.")         \
3979                                                                             \
3980   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3981           "Print generated stub code for method handles")                   \
3982                                                                             \
3983   develop(bool, TraceMethodHandles, false,                                  \
3984           "trace internal method handle operations")                        \
3985                                                                             \
3986   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3987           "perform extra checks when constructing method handles")          \
3988                                                                             \
3989   diagnostic(bool, ShowHiddenFrames, false,                                 \
3990           "show method handle implementation frames (usually hidden)")      \
3991                                                                             \
3992   experimental(bool, TrustFinalNonStaticFields, false,                      \
3993           "trust final non-static declarations for constant folding")       \
3994                                                                             \
3995   diagnostic(bool, FoldStableValues, true,                                  \
3996           "Optimize loads from stable fields (marked w/ @Stable)")          \
3997                                                                             \
3998   develop(bool, TraceInvokeDynamic, false,                                  \
3999           "trace internal invoke dynamic operations")                       \
4000                                                                             \
4001   diagnostic(bool, PauseAtStartup,      false,                              \
4002           "Causes the VM to pause at startup time and wait for the pause "  \
4003           "file to be removed (default: ./vm.paused.<pid>)")                \
4004                                                                             \
4005   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
4006           "The file to create and for whose removal to await when pausing " \
4007           "at startup. (default: ./vm.paused.<pid>)")                       \
4008                                                                             \
4009   diagnostic(bool, PauseAtExit, false,                                      \
4010           "Pause and wait for keypress on exit if a debugger is attached")  \
4011                                                                             \
4012   product(bool, ExtendedDTraceProbes,    false,                             \
4013           "Enable performance-impacting dtrace probes")                     \
4014                                                                             \
4015   product(bool, DTraceMethodProbes, false,                                  \
4016           "Enable dtrace probes for method-entry and method-exit")          \
4017                                                                             \
4018   product(bool, DTraceAllocProbes, false,                                   \
4019           "Enable dtrace probes for object allocation")                     \
4020                                                                             \
4021   product(bool, DTraceMonitorProbes, false,                                 \
4022           "Enable dtrace probes for monitor events")                        \
4023                                                                             \
4024   product(bool, RelaxAccessControlCheck, false,                             \
4025           "Relax the access control checks in the verifier")                \
4026                                                                             \
4027   product(uintx, StringTableSize, defaultStringTableSize,                   \
4028           "Number of buckets in the interned String table")                 \
4029           range(minimumStringTableSize, 111*defaultStringTableSize)         \
4030                                                                             \
4031   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
4032           "Number of buckets in the JVM internal Symbol table")             \
4033           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
4034                                                                             \
4035   product(bool, UseStringDeduplication, false,                              \
4036           "Use string deduplication")                                       \
4037                                                                             \
4038   product(bool, PrintStringDeduplicationStatistics, false,                  \
4039           "Print string deduplication statistics")                          \
4040                                                                             \
4041   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4042           "A string must reach this age (or be promoted to an old region) " \
4043           "to be considered for deduplication")                             \
4044           range(1, markOopDesc::max_age)                                    \
4045                                                                             \
4046   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4047           "Force table resize every time the table is scanned")             \
4048                                                                             \
4049   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4050           "Force table rehash every time the table is scanned")             \
4051                                                                             \
4052   develop(bool, TraceDefaultMethods, false,                                 \
4053           "Trace the default method processing steps")                      \
4054                                                                             \
4055   diagnostic(bool, WhiteBoxAPI, false,                                      \
4056           "Enable internal testing APIs")                                   \
4057                                                                             \
4058   product(bool, PrintGCCause, true,                                         \
4059           "Include GC cause in GC logging")                                 \
4060                                                                             \
4061   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4062            "Default survivor space alignment in bytes")                     \
4063            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4064                                                                             \
4065   product(bool , AllowNonVirtualCalls, false,                               \
4066           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4067                                                                             \
4068   product(ccstr, DumpLoadedClassList, NULL,                                 \
4069           "Dump the names all loaded classes, that could be stored into "   \
4070           "the CDS archive, in the specified file")                         \
4071                                                                             \
4072   product(ccstr, SharedClassListFile, NULL,                                 \
4073           "Override the default CDS class list")                            \
4074                                                                             \
4075   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4076           "Override the default location of the CDS archive file")          \
4077                                                                             \
4078   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4079           "Extra classlist for building the CDS archive file")              \
4080                                                                             \
4081   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4082           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4083           "Allocation less than this value will be allocated "              \
4084           "using malloc. Larger allocations will use mmap.")                \
4085                                                                             \
4086   experimental(bool, AlwaysAtomicAccesses, false,                           \
4087           "Accesses to all variables should always be atomic")              \
4088                                                                             \
4089   product(bool, EnableTracing, false,                                       \
4090           "Enable event-based tracing")                                     \
4091                                                                             \
4092   product(bool, UseLockedTracing, false,                                    \
4093           "Use locked-tracing when doing event-based tracing")              \
4094                                                                             \
4095   diagnostic(bool, UseUnalignedAccesses, false,                             \
4096           "Use unaligned memory accesses in sun.misc.Unsafe")               \
4097                                                                             \
4098   product_pd(bool, PreserveFramePointer,                                    \
4099              "Use the FP register for holding the frame pointer "           \
4100              "and not as a general purpose register.")                      \
4101                                                                             \
4102   diagnostic(bool, CheckIntrinsics, true,                                   \
4103              "When a class C is loaded, check that "                        \
4104              "(1) all intrinsics defined by the VM for class C are present "\
4105              "in the loaded class file and are marked with the "            \
4106              "@HotSpotIntrinsicCandidate annotation, that "                 \
4107              "(2) there is an intrinsic registered for all loaded methods " \
4108              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4109              "annotation, and that "                                        \
4110              "(3) no orphan methods exist for class C (i.e., methods for "  \
4111              "which the VM declares an intrinsic but that are not declared "\
4112              "in the loaded class C. "                                      \
4113              "Check (3) is available only in debug builds.")                \
4114                                                                             \
4115   product(bool, CompileCommandCompatibility, false,                         \
4116              "Enable backwards compatibility for compile commands.")        \
4117                                                                             \
4118   product(bool, PrintCompilerDirectives, false,                             \
4119              "Print compiler directives on installation.")
4120 
4121 /*
4122  *  Macros for factoring of globals
4123  */
4124 
4125 // Interface macros
4126 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4127 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4128 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4129 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4130 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4131 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4132 #ifdef PRODUCT
4133 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
4134 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
4135 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
4136 #else
4137 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4138 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4139 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4140 #endif // PRODUCT
4141 // Special LP64 flags, product only needed for now.
4142 #ifdef _LP64
4143 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4144 #else
4145 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4146 #endif // _LP64
4147 
4148 // Implementation macros
4149 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4150 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4151 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4152 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4153 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4154 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4155 #ifdef PRODUCT
4156 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
4157 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
4158 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
4159 #else
4160 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4161 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4162 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4163 #endif // PRODUCT
4164 #ifdef _LP64
4165 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4166 #else
4167 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4168 #endif // _LP64
4169 
4170 // Only materialize src code for range checking when required, ignore otherwise
4171 #define IGNORE_RANGE(a, b)
4172 // Only materialize src code for contraint checking when required, ignore otherwise
4173 #define IGNORE_CONSTRAINT(func,type)
4174 
4175 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4176               DECLARE_PD_DEVELOPER_FLAG, \
4177               DECLARE_PRODUCT_FLAG, \
4178               DECLARE_PD_PRODUCT_FLAG, \
4179               DECLARE_DIAGNOSTIC_FLAG, \
4180               DECLARE_EXPERIMENTAL_FLAG, \
4181               DECLARE_NOTPRODUCT_FLAG, \
4182               DECLARE_MANAGEABLE_FLAG, \
4183               DECLARE_PRODUCT_RW_FLAG, \
4184               DECLARE_LP64_PRODUCT_FLAG, \
4185               IGNORE_RANGE, \
4186               IGNORE_CONSTRAINT)
4187 
4188 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4189                  DECLARE_PD_DEVELOPER_FLAG, \
4190                  DECLARE_PRODUCT_FLAG, \
4191                  DECLARE_PD_PRODUCT_FLAG, \
4192                  DECLARE_DIAGNOSTIC_FLAG, \
4193                  DECLARE_NOTPRODUCT_FLAG, \
4194                  IGNORE_RANGE, \
4195                  IGNORE_CONSTRAINT)
4196 
4197 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4198            DECLARE_PRODUCT_FLAG, \
4199            DECLARE_DIAGNOSTIC_FLAG, \
4200            DECLARE_EXPERIMENTAL_FLAG, \
4201            DECLARE_NOTPRODUCT_FLAG, \
4202            IGNORE_RANGE, \
4203            IGNORE_CONSTRAINT)
4204 
4205 // Extensions
4206 
4207 #include "runtime/globals_ext.hpp"
4208 
4209 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP