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     switch (error) {
 377       case Flag::MISSING_NAME: return "MISSING_NAME";
 378       case Flag::MISSING_VALUE: return "MISSING_VALUE";
 379       case Flag::NON_WRITABLE: return "NON_WRITABLE";
 380       case Flag::OUT_OF_BOUNDS: return "OUT_OF_BOUNDS";
 381       case Flag::VIOLATES_CONSTRAINT: return "VIOLATES_CONSTRAINT";
 382       case Flag::INVALID_FLAG: return "INVALID_FLAG";
 383       case Flag::ERR_OTHER: return "ERR_OTHER";
 384       case Flag::SUCCESS: return "SUCCESS";
 385       default: return "NULL";
 386     }
 387   }
 388 };
 389 
 390 // debug flags control various aspects of the VM and are global accessible
 391 
 392 // use FlagSetting to temporarily change some debug flag
 393 // e.g. FlagSetting fs(DebugThisAndThat, true);
 394 // restored to previous value upon leaving scope
 395 class FlagSetting {
 396   bool val;
 397   bool* flag;
 398  public:
 399   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 400   ~FlagSetting()                       { *flag = val; }
 401 };
 402 
 403 
 404 class CounterSetting {
 405   intx* counter;
 406  public:
 407   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 408   ~CounterSetting()         { (*counter)--; }
 409 };
 410 
 411 class IntFlagSetting {
 412   int val;
 413   int* flag;
 414  public:
 415   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 416   ~IntFlagSetting()                     { *flag = val; }
 417 };
 418 
 419 class UIntFlagSetting {
 420   uint val;
 421   uint* flag;
 422  public:
 423   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 424   ~UIntFlagSetting()                       { *flag = val; }
 425 };
 426 
 427 class UIntXFlagSetting {
 428   uintx val;
 429   uintx* flag;
 430  public:
 431   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 432   ~UIntXFlagSetting()                         { *flag = val; }
 433 };
 434 
 435 class DoubleFlagSetting {
 436   double val;
 437   double* flag;
 438  public:
 439   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 440   ~DoubleFlagSetting()                           { *flag = val; }
 441 };
 442 
 443 class SizeTFlagSetting {
 444   size_t val;
 445   size_t* flag;
 446  public:
 447   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 448   ~SizeTFlagSetting()                           { *flag = val; }
 449 };
 450 
 451 
 452 class CommandLineFlags {
 453 public:
 454   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 455   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); }
 456   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 457   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 458 
 459   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 460   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); }
 461   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 462   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 463 
 464   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 465   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); }
 466   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 467   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 468 
 469   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 470   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); }
 471   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 472   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 473 
 474   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 475   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); }
 476   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 477   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 478 
 479   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 480   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); }
 481   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 482   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 483 
 484   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 485   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); }
 486   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 487   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 488 
 489   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 490   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); }
 491   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 492   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 493 
 494   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 495   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); }
 496   // Contract:  Flag will make private copy of the incoming value.
 497   // Outgoing value is always malloc-ed, and caller MUST call free.
 498   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 499   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 500 
 501   // Returns false if name is not a command line flag.
 502   static bool wasSetOnCmdline(const char* name, bool* value);
 503   static void printSetFlags(outputStream* out);
 504 
 505   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 506   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 507 
 508   static void verify() PRODUCT_RETURN;
 509 };
 510 
 511 // use this for flags that are true by default in the debug version but
 512 // false in the optimized version, and vice versa
 513 #ifdef ASSERT
 514 #define trueInDebug  true
 515 #define falseInDebug false
 516 #else
 517 #define trueInDebug  false
 518 #define falseInDebug true
 519 #endif
 520 
 521 // use this for flags that are true per default in the product build
 522 // but false in development builds, and vice versa
 523 #ifdef PRODUCT
 524 #define trueInProduct  true
 525 #define falseInProduct false
 526 #else
 527 #define trueInProduct  false
 528 #define falseInProduct true
 529 #endif
 530 
 531 #ifdef JAVASE_EMBEDDED
 532 #define falseInEmbedded false
 533 #else
 534 #define falseInEmbedded true
 535 #endif
 536 
 537 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 538 // product flags are always settable / visible
 539 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 540 
 541 // A flag must be declared with one of the following types:
 542 // bool, intx, uintx, size_t, ccstr, double, or uint64_t.
 543 // The type "ccstr" is an alias for "const char*" and is used
 544 // only in this file, because the macrology requires single-token type names.
 545 
 546 // Note: Diagnostic options not meant for VM tuning or for product modes.
 547 // They are to be used for VM quality assurance or field diagnosis
 548 // of VM bugs.  They are hidden so that users will not be encouraged to
 549 // try them as if they were VM ordinary execution options.  However, they
 550 // are available in the product version of the VM.  Under instruction
 551 // from support engineers, VM customers can turn them on to collect
 552 // diagnostic information about VM problems.  To use a VM diagnostic
 553 // option, you must first specify +UnlockDiagnosticVMOptions.
 554 // (This master switch also affects the behavior of -Xprintflags.)
 555 //
 556 // experimental flags are in support of features that are not
 557 //    part of the officially supported product, but are available
 558 //    for experimenting with. They could, for example, be performance
 559 //    features that may not have undergone full or rigorous QA, but which may
 560 //    help performance in some cases and released for experimentation
 561 //    by the community of users and developers. This flag also allows one to
 562 //    be able to build a fully supported product that nonetheless also
 563 //    ships with some unsupported, lightly tested, experimental features.
 564 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 565 //    UnlockExperimentalVMOptions flag, which allows the control and
 566 //    modification of the experimental flags.
 567 //
 568 // Nota bene: neither diagnostic nor experimental options should be used casually,
 569 //    and they are not supported on production loads, except under explicit
 570 //    direction from support engineers.
 571 //
 572 // manageable flags are writeable external product flags.
 573 //    They are dynamically writeable through the JDK management interface
 574 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 575 //    These flags are external exported interface (see CCC).  The list of
 576 //    manageable flags can be queried programmatically through the management
 577 //    interface.
 578 //
 579 //    A flag can be made as "manageable" only if
 580 //    - the flag is defined in a CCC as an external exported interface.
 581 //    - the VM implementation supports dynamic setting of the flag.
 582 //      This implies that the VM must *always* query the flag variable
 583 //      and not reuse state related to the flag state at any given time.
 584 //    - you want the flag to be queried programmatically by the customers.
 585 //
 586 // product_rw flags are writeable internal product flags.
 587 //    They are like "manageable" flags but for internal/private use.
 588 //    The list of product_rw flags are internal/private flags which
 589 //    may be changed/removed in a future release.  It can be set
 590 //    through the management interface to get/set value
 591 //    when the name of flag is supplied.
 592 //
 593 //    A flag can be made as "product_rw" only if
 594 //    - the VM implementation supports dynamic setting of the flag.
 595 //      This implies that the VM must *always* query the flag variable
 596 //      and not reuse state related to the flag state at any given time.
 597 //
 598 // Note that when there is a need to support develop flags to be writeable,
 599 // it can be done in the same way as product_rw.
 600 //
 601 // range is a macro that will expand to min and max arguments for range
 602 //    checking code if provided - see commandLineFlagRangeList.hpp
 603 //
 604 // constraint is a macro that will expand to custom function call
 605 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 606 //
 607 
 608 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
 609                                                                             \
 610   lp64_product(bool, UseCompressedOops, false,                              \
 611           "Use 32-bit object references in 64-bit VM. "                     \
 612           "lp64_product means flag is always constant in 32 bit VM")        \
 613                                                                             \
 614   lp64_product(bool, UseCompressedClassPointers, false,                     \
 615           "Use 32-bit class pointers in 64-bit VM. "                        \
 616           "lp64_product means flag is always constant in 32 bit VM")        \
 617                                                                             \
 618   notproduct(bool, CheckCompressedOops, true,                               \
 619           "Generate checks in encoding/decoding code in debug VM")          \
 620                                                                             \
 621   product_pd(size_t, HeapBaseMinAddress,                                    \
 622           "OS specific low limit for heap base address")                    \
 623                                                                             \
 624   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 625           "Heap allocation steps through preferred address regions to find" \
 626           " where it can allocate the heap. Number of steps to take per "   \
 627           "region.")                                                        \
 628           range(1, max_uintx)                                               \
 629                                                                             \
 630   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 631           "Print compressed oops base address and encoding mode")           \
 632                                                                             \
 633   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 634           "Default object alignment in bytes, 8 is minimum")                \
 635           range(8, 256)                                                     \
 636           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 637                                                                             \
 638   product(bool, AssumeMP, false,                                            \
 639           "Instruct the VM to assume multiple processors are available")    \
 640                                                                             \
 641   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 642   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 643   /* been re-added (see 6401008)                                         */ \
 644   product_pd(bool, UseMembar,                                               \
 645           "(Unstable) Issues membars on thread state transitions")          \
 646                                                                             \
 647   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 648           "Clean the chunk pool asynchronously")                            \
 649                                                                             \
 650   experimental(bool, AlwaysSafeConstructors, false,                         \
 651           "Force safe construction, as if all fields are final.")           \
 652                                                                             \
 653   /* Temporary: See 6948537 */                                              \
 654   experimental(bool, UseMemSetInBOT, true,                                  \
 655           "(Unstable) uses memset in BOT updates in GC code")               \
 656                                                                             \
 657   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 658           "Enable normal processing of flags relating to field diagnostics")\
 659                                                                             \
 660   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 661           "Enable normal processing of flags relating to experimental "     \
 662           "features")                                                       \
 663                                                                             \
 664   product(bool, JavaMonitorsInStackTrace, true,                             \
 665           "Print information about Java monitor locks when the stacks are"  \
 666           "dumped")                                                         \
 667                                                                             \
 668   product_pd(bool, UseLargePages,                                           \
 669           "Use large page memory")                                          \
 670                                                                             \
 671   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 672           "Allocate large pages individually for better affinity")          \
 673                                                                             \
 674   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 675           "Fail large pages individual allocation")                         \
 676                                                                             \
 677   product(bool, UseLargePagesInMetaspace, false,                            \
 678           "Use large page memory in metaspace. "                            \
 679           "Only used if UseLargePages is enabled.")                         \
 680                                                                             \
 681   develop(bool, TracePageSizes, false,                                      \
 682           "Trace page size selection and usage")                            \
 683                                                                             \
 684   product(bool, UseNUMA, false,                                             \
 685           "Use NUMA if available")                                          \
 686                                                                             \
 687   product(bool, UseNUMAInterleaving, false,                                 \
 688           "Interleave memory across NUMA nodes if available")               \
 689                                                                             \
 690   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 691           "Granularity to use for NUMA interleaving on Windows OS")         \
 692                                                                             \
 693   product(bool, ForceNUMA, false,                                           \
 694           "Force NUMA optimizations on single-node/UMA systems")            \
 695                                                                             \
 696   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 697           "Percentage (0-100) used to weight the current sample when "      \
 698           "computing exponentially decaying average for "                   \
 699           "AdaptiveNUMAChunkSizing")                                        \
 700           range(0, 100)                                                     \
 701                                                                             \
 702   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 703           "Do not reallocate more than this amount per collection")         \
 704                                                                             \
 705   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 706           "Enable adaptive chunk sizing for NUMA")                          \
 707                                                                             \
 708   product(bool, NUMAStats, false,                                           \
 709           "Print NUMA stats in detailed heap information")                  \
 710                                                                             \
 711   product(uintx, NUMAPageScanRate, 256,                                     \
 712           "Maximum number of pages to include in the page scan procedure")  \
 713                                                                             \
 714   product_pd(bool, NeedsDeoptSuspend,                                       \
 715           "True for register window machines (sparc/ia64)")                 \
 716                                                                             \
 717   product(intx, UseSSE, 99,                                                 \
 718           "Highest supported SSE instructions set on x86/x64")              \
 719                                                                             \
 720   product(bool, UseAES, false,                                              \
 721           "Control whether AES instructions can be used on x86/x64")        \
 722                                                                             \
 723   product(bool, UseSHA, false,                                              \
 724           "Control whether SHA instructions can be used "                   \
 725           "on SPARC and on ARM")                                            \
 726                                                                             \
 727   product(bool, UseGHASHIntrinsics, false,                                  \
 728           "Use intrinsics for GHASH versions of crypto")                    \
 729                                                                             \
 730   product(size_t, LargePageSizeInBytes, 0,                                  \
 731           "Large page size (0 to let VM choose the page size)")             \
 732                                                                             \
 733   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 734           "Use large pages if maximum heap is at least this big")           \
 735                                                                             \
 736   product(bool, ForceTimeHighResolution, false,                             \
 737           "Using high time resolution (for Win32 only)")                    \
 738                                                                             \
 739   develop(bool, TraceItables, false,                                        \
 740           "Trace initialization and use of itables")                        \
 741                                                                             \
 742   develop(bool, TracePcPatching, false,                                     \
 743           "Trace usage of frame::patch_pc")                                 \
 744                                                                             \
 745   develop(bool, TraceJumps, false,                                          \
 746           "Trace assembly jumps in thread ring buffer")                     \
 747                                                                             \
 748   develop(bool, TraceRelocator, false,                                      \
 749           "Trace the bytecode relocator")                                   \
 750                                                                             \
 751   develop(bool, TraceLongCompiles, false,                                   \
 752           "Print out every time compilation is longer than "                \
 753           "a given threshold")                                              \
 754                                                                             \
 755   develop(bool, SafepointALot, false,                                       \
 756           "Generate a lot of safepoints. This works with "                  \
 757           "GuaranteedSafepointInterval")                                    \
 758                                                                             \
 759   product_pd(bool, BackgroundCompilation,                                   \
 760           "A thread requesting compilation is not blocked during "          \
 761           "compilation")                                                    \
 762                                                                             \
 763   product(bool, PrintVMQWaitTime, false,                                    \
 764           "Print out the waiting time in VM operation queue")               \
 765                                                                             \
 766   develop(bool, TraceOopMapGeneration, false,                               \
 767           "Show OopMapGeneration")                                          \
 768                                                                             \
 769   product(bool, MethodFlushing, true,                                       \
 770           "Reclamation of zombie and not-entrant methods")                  \
 771                                                                             \
 772   develop(bool, VerifyStack, false,                                         \
 773           "Verify stack of each thread when it is entering a runtime call") \
 774                                                                             \
 775   diagnostic(bool, ForceUnreachable, false,                                 \
 776           "Make all non code cache addresses to be unreachable by "         \
 777           "forcing use of 64bit literal fixups")                            \
 778                                                                             \
 779   notproduct(bool, StressDerivedPointers, false,                            \
 780           "Force scavenge when a derived pointer is detected on stack "     \
 781           "after rtm call")                                                 \
 782                                                                             \
 783   develop(bool, TraceDerivedPointers, false,                                \
 784           "Trace traversal of derived pointers on stack")                   \
 785                                                                             \
 786   notproduct(bool, TraceCodeBlobStacks, false,                              \
 787           "Trace stack-walk of codeblobs")                                  \
 788                                                                             \
 789   product(bool, PrintJNIResolving, false,                                   \
 790           "Used to implement -v:jni")                                       \
 791                                                                             \
 792   notproduct(bool, PrintRewrites, false,                                    \
 793           "Print methods that are being rewritten")                         \
 794                                                                             \
 795   product(bool, UseInlineCaches, true,                                      \
 796           "Use Inline Caches for virtual calls ")                           \
 797                                                                             \
 798   develop(bool, InlineArrayCopy, true,                                      \
 799           "Inline arraycopy native that is known to be part of "            \
 800           "base library DLL")                                               \
 801                                                                             \
 802   develop(bool, InlineObjectHash, true,                                     \
 803           "Inline Object::hashCode() native that is known to be part "      \
 804           "of base library DLL")                                            \
 805                                                                             \
 806   develop(bool, InlineNatives, true,                                        \
 807           "Inline natives that are known to be part of base library DLL")   \
 808                                                                             \
 809   develop(bool, InlineMathNatives, true,                                    \
 810           "Inline SinD, CosD, etc.")                                        \
 811                                                                             \
 812   develop(bool, InlineClassNatives, true,                                   \
 813           "Inline Class.isInstance, etc")                                   \
 814                                                                             \
 815   develop(bool, InlineThreadNatives, true,                                  \
 816           "Inline Thread.currentThread, etc")                               \
 817                                                                             \
 818   develop(bool, InlineUnsafeOps, true,                                      \
 819           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
 820                                                                             \
 821   product(bool, CriticalJNINatives, true,                                   \
 822           "Check for critical JNI entry points")                            \
 823                                                                             \
 824   notproduct(bool, StressCriticalJNINatives, false,                         \
 825           "Exercise register saving code in critical natives")              \
 826                                                                             \
 827   product(bool, UseSSE42Intrinsics, false,                                  \
 828           "SSE4.2 versions of intrinsics")                                  \
 829                                                                             \
 830   product(bool, UseAESIntrinsics, false,                                    \
 831           "Use intrinsics for AES versions of crypto")                      \
 832                                                                             \
 833   product(bool, UseSHA1Intrinsics, false,                                   \
 834           "Use intrinsics for SHA-1 crypto hash function. "                 \
 835           "Requires that UseSHA is enabled.")                                \
 836                                                                             \
 837   product(bool, UseSHA256Intrinsics, false,                                 \
 838           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 839           "Requires that UseSHA is enabled.")                               \
 840                                                                             \
 841   product(bool, UseSHA512Intrinsics, false,                                 \
 842           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 843           "Requires that UseSHA is enabled.")                               \
 844                                                                             \
 845   product(bool, UseCRC32Intrinsics, false,                                  \
 846           "use intrinsics for java.util.zip.CRC32")                         \
 847                                                                             \
 848   product(bool, UseCRC32CIntrinsics, false,                                 \
 849           "use intrinsics for java.util.zip.CRC32C")                        \
 850                                                                             \
 851   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 852          "do not expand intrinsics whose (internal) names appear here")     \
 853                                                                             \
 854   develop(bool, TraceCallFixup, false,                                      \
 855           "Trace all call fixups")                                          \
 856                                                                             \
 857   develop(bool, DeoptimizeALot, false,                                      \
 858           "Deoptimize at every exit from the runtime system")               \
 859                                                                             \
 860   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 861           "A comma separated list of bcis to deoptimize at")                \
 862                                                                             \
 863   product(bool, DeoptimizeRandom, false,                                    \
 864           "Deoptimize random frames on random exit from the runtime system")\
 865                                                                             \
 866   notproduct(bool, ZombieALot, false,                                       \
 867           "Create zombies (non-entrant) at exit from the runtime system")   \
 868                                                                             \
 869   product(bool, UnlinkSymbolsALot, false,                                   \
 870           "Unlink unreferenced symbols from the symbol table at safepoints")\
 871                                                                             \
 872   notproduct(bool, WalkStackALot, false,                                    \
 873           "Trace stack (no print) at every exit from the runtime system")   \
 874                                                                             \
 875   product(bool, Debugging, false,                                           \
 876           "Set when executing debug methods in debug.cpp "                  \
 877           "(to prevent triggering assertions)")                             \
 878                                                                             \
 879   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 880           "Enable strict checks that safepoints cannot happen for threads " \
 881           "that use No_Safepoint_Verifier")                                 \
 882                                                                             \
 883   notproduct(bool, VerifyLastFrame, false,                                  \
 884           "Verify oops on last frame on entry to VM")                       \
 885                                                                             \
 886   develop(bool, TraceHandleAllocation, false,                               \
 887           "Print out warnings when suspiciously many handles are allocated")\
 888                                                                             \
 889   product(bool, FailOverToOldVerifier, true,                                \
 890           "Fail over to old verifier when split verifier fails")            \
 891                                                                             \
 892   develop(bool, ShowSafepointMsgs, false,                                   \
 893           "Show message about safepoint synchronization")                   \
 894                                                                             \
 895   product(bool, SafepointTimeout, false,                                    \
 896           "Time out and warn or fail after SafepointTimeoutDelay "          \
 897           "milliseconds if failed to reach safepoint")                      \
 898                                                                             \
 899   develop(bool, DieOnSafepointTimeout, false,                               \
 900           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 901                                                                             \
 902   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 903   /* typically, at most a few retries are needed                    */      \
 904   product(intx, SuspendRetryCount, 50,                                      \
 905           "Maximum retry count for an external suspend request")            \
 906                                                                             \
 907   product(intx, SuspendRetryDelay, 5,                                       \
 908           "Milliseconds to delay per retry (* current_retry_count)")        \
 909                                                                             \
 910   product(bool, AssertOnSuspendWaitFailure, false,                          \
 911           "Assert/Guarantee on external suspend wait failure")              \
 912                                                                             \
 913   product(bool, TraceSuspendWaitFailures, false,                            \
 914           "Trace external suspend wait failures")                           \
 915                                                                             \
 916   product(bool, MaxFDLimit, true,                                           \
 917           "Bump the number of file descriptors to maximum in Solaris")      \
 918                                                                             \
 919   diagnostic(bool, LogEvents, true,                                         \
 920           "Enable the various ring buffer event logs")                      \
 921                                                                             \
 922   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 923           "Number of ring buffer event logs")                               \
 924           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 925                                                                             \
 926   product(bool, BytecodeVerificationRemote, true,                           \
 927           "Enable the Java bytecode verifier for remote classes")           \
 928                                                                             \
 929   product(bool, BytecodeVerificationLocal, false,                           \
 930           "Enable the Java bytecode verifier for local classes")            \
 931                                                                             \
 932   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 933           "Force exceptions on FP stack under/overflow")                    \
 934                                                                             \
 935   develop(bool, VerifyStackAtCalls, false,                                  \
 936           "Verify that the stack pointer is unchanged after calls")         \
 937                                                                             \
 938   develop(bool, TraceJavaAssertions, false,                                 \
 939           "Trace java language assertions")                                 \
 940                                                                             \
 941   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 942           "Temporary - see javaClasses.cpp")                                \
 943                                                                             \
 944   notproduct(bool, PrintMallocFree, false,                                  \
 945           "Trace calls to C heap malloc/free allocation")                   \
 946                                                                             \
 947   product(bool, PrintOopAddress, false,                                     \
 948           "Always print the location of the oop")                           \
 949                                                                             \
 950   notproduct(bool, VerifyCodeCache, false,                                  \
 951           "Verify code cache on memory allocation/deallocation")            \
 952                                                                             \
 953   develop(bool, ZapDeadCompiledLocals, false,                               \
 954           "Zap dead locals in compiler frames")                             \
 955                                                                             \
 956   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 957           "Zap dead locals (old version, zaps all frames when "             \
 958           "entering the VM")                                                \
 959                                                                             \
 960   notproduct(bool, CheckOopishValues, false,                                \
 961           "Warn if value contains oop (requires ZapDeadLocals)")            \
 962                                                                             \
 963   develop(bool, UseMallocOnly, false,                                       \
 964           "Use only malloc/free for allocation (no resource area/arena)")   \
 965                                                                             \
 966   develop(bool, PrintMalloc, false,                                         \
 967           "Print all malloc/free calls")                                    \
 968                                                                             \
 969   develop(bool, PrintMallocStatistics, false,                               \
 970           "Print malloc/free statistics")                                   \
 971                                                                             \
 972   develop(bool, ZapResourceArea, trueInDebug,                               \
 973           "Zap freed resource/arena space with 0xABABABAB")                 \
 974                                                                             \
 975   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 976           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 977                                                                             \
 978   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 979           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 980                                                                             \
 981   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 982           "Zap allocated/freed stack segments with 0xFADFADED")             \
 983                                                                             \
 984   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 985           "Zap unused heap space with 0xBAADBABE")                          \
 986                                                                             \
 987   develop(bool, TraceZapUnusedHeapArea, false,                              \
 988           "Trace zapping of unused heap space")                             \
 989                                                                             \
 990   develop(bool, CheckZapUnusedHeapArea, false,                              \
 991           "Check zapping of unused heap space")                             \
 992                                                                             \
 993   develop(bool, ZapFillerObjects, trueInDebug,                              \
 994           "Zap filler objects with 0xDEAFBABE")                             \
 995                                                                             \
 996   develop(bool, PrintVMMessages, true,                                      \
 997           "Print VM messages on console")                                   \
 998                                                                             \
 999   product(bool, PrintGCApplicationConcurrentTime, false,                    \
1000           "Print the time the application has been running")                \
1001                                                                             \
1002   product(bool, PrintGCApplicationStoppedTime, false,                       \
1003           "Print the time the application has been stopped")                \
1004                                                                             \
1005   diagnostic(bool, VerboseVerification, false,                              \
1006           "Display detailed verification details")                          \
1007                                                                             \
1008   notproduct(uintx, ErrorHandlerTest, 0,                                    \
1009           "If > 0, provokes an error after VM initialization; the value "   \
1010           "determines which error to provoke. See test_error_handler() "    \
1011           "in debug.cpp.")                                                  \
1012                                                                             \
1013   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
1014           "If > 0, provokes an error inside VM error handler (a secondary " \
1015           "crash). see test_error_handler() in debug.cpp.")                 \
1016                                                                             \
1017   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
1018           "If true, tests SafeFetch inside error handler.")                 \
1019                                                                             \
1020   develop(bool, Verbose, false,                                             \
1021           "Print additional debugging information from other modes")        \
1022                                                                             \
1023   develop(bool, PrintMiscellaneous, false,                                  \
1024           "Print uncategorized debugging information (requires +Verbose)")  \
1025                                                                             \
1026   develop(bool, WizardMode, false,                                          \
1027           "Print much more debugging information")                          \
1028                                                                             \
1029   product(bool, ShowMessageBoxOnError, false,                               \
1030           "Keep process alive on VM fatal error")                           \
1031                                                                             \
1032   product(bool, CreateCoredumpOnCrash, true,                                \
1033           "Create core/mini dump on VM fatal error")                        \
1034                                                                             \
1035   product(uintx, ErrorLogTimeout, 2 * 60,                                   \
1036           "Timeout, in seconds, to limit the time spent on writing an "     \
1037           "error log in case of a crash.")                                  \
1038                                                                             \
1039   product_pd(bool, UseOSErrorReporting,                                     \
1040           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
1041                                                                             \
1042   product(bool, SuppressFatalErrorMessage, false,                           \
1043           "Report NO fatal error message (avoid deadlock)")                 \
1044                                                                             \
1045   product(ccstrlist, OnError, "",                                           \
1046           "Run user-defined commands on fatal error; see VMError.cpp "      \
1047           "for examples")                                                   \
1048                                                                             \
1049   product(ccstrlist, OnOutOfMemoryError, "",                                \
1050           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
1051                                                                             \
1052   manageable(bool, HeapDumpBeforeFullGC, false,                             \
1053           "Dump heap to file before any major stop-the-world GC")           \
1054                                                                             \
1055   manageable(bool, HeapDumpAfterFullGC, false,                              \
1056           "Dump heap to file after any major stop-the-world GC")            \
1057                                                                             \
1058   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
1059           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
1060                                                                             \
1061   manageable(ccstr, HeapDumpPath, NULL,                                     \
1062           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
1063           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
1064           "in the working directory)")                                      \
1065                                                                             \
1066   develop(size_t, SegmentedHeapDumpThreshold, 2*G,                          \
1067           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
1068           "when the heap usage is larger than this")                        \
1069                                                                             \
1070   develop(size_t, HeapDumpSegmentSize, 1*G,                                 \
1071           "Approximate segment size when generating a segmented heap dump") \
1072                                                                             \
1073   develop(bool, BreakAtWarning, false,                                      \
1074           "Execute breakpoint upon encountering VM warning")                \
1075                                                                             \
1076   develop(bool, TraceVMOperation, false,                                    \
1077           "Trace VM operations")                                            \
1078                                                                             \
1079   develop(bool, UseFakeTimers, false,                                       \
1080           "Tell whether the VM should use system time or a fake timer")     \
1081                                                                             \
1082   product(ccstr, NativeMemoryTracking, "off",                               \
1083           "Native memory tracking options")                                 \
1084                                                                             \
1085   diagnostic(bool, PrintNMTStatistics, false,                               \
1086           "Print native memory tracking summary data if it is on")          \
1087                                                                             \
1088   diagnostic(bool, LogCompilation, false,                                   \
1089           "Log compilation activity in detail to LogFile")                  \
1090                                                                             \
1091   product(bool, PrintCompilation, false,                                    \
1092           "Print compilations")                                             \
1093                                                                             \
1094   diagnostic(bool, TraceNMethodInstalls, false,                             \
1095           "Trace nmethod installation")                                     \
1096                                                                             \
1097   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1098           "0: do not allow scavengable oops in the code cache; "            \
1099           "1: allow scavenging from the code cache; "                       \
1100           "2: emit as many constants as the compiler can see")              \
1101           range(0, 2)                                                       \
1102                                                                             \
1103   product(bool, AlwaysRestoreFPU, false,                                    \
1104           "Restore the FPU control word after every JNI call (expensive)")  \
1105                                                                             \
1106   product(bool, MemoryMapImage, false,                                      \
1107           "Memory map entire runtime image")                                \
1108                                                                             \
1109   diagnostic(bool, PrintCompilation2, false,                                \
1110           "Print additional statistics per compilation")                    \
1111                                                                             \
1112   diagnostic(bool, PrintAdapterHandlers, false,                             \
1113           "Print code generated for i2c/c2i adapters")                      \
1114                                                                             \
1115   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1116           "Verify that i2c/c2i adapters are called properly")               \
1117                                                                             \
1118   develop(bool, VerifyAdapterSharing, false,                                \
1119           "Verify that the code for shared adapters is the equivalent")     \
1120                                                                             \
1121   diagnostic(bool, PrintAssembly, false,                                    \
1122           "Print assembly code (using external disassembler.so)")           \
1123                                                                             \
1124   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1125           "Print options string passed to disassembler.so")                 \
1126                                                                             \
1127   diagnostic(bool, PrintNMethods, false,                                    \
1128           "Print assembly code for nmethods when generated")                \
1129                                                                             \
1130   diagnostic(bool, PrintNativeNMethods, false,                              \
1131           "Print assembly code for native nmethods when generated")         \
1132                                                                             \
1133   develop(bool, PrintDebugInfo, false,                                      \
1134           "Print debug information for all nmethods when generated")        \
1135                                                                             \
1136   develop(bool, PrintRelocations, false,                                    \
1137           "Print relocation information for all nmethods when generated")   \
1138                                                                             \
1139   develop(bool, PrintDependencies, false,                                   \
1140           "Print dependency information for all nmethods when generated")   \
1141                                                                             \
1142   develop(bool, PrintExceptionHandlers, false,                              \
1143           "Print exception handler tables for all nmethods when generated") \
1144                                                                             \
1145   develop(bool, StressCompiledExceptionHandlers, false,                     \
1146           "Exercise compiled exception handlers")                           \
1147                                                                             \
1148   develop(bool, InterceptOSException, false,                                \
1149           "Start debugger when an implicit OS (e.g. NULL) "                 \
1150           "exception happens")                                              \
1151                                                                             \
1152   product(bool, PrintCodeCache, false,                                      \
1153           "Print the code cache memory usage when exiting")                 \
1154                                                                             \
1155   develop(bool, PrintCodeCache2, false,                                     \
1156           "Print detailed usage information on the code cache when exiting")\
1157                                                                             \
1158   product(bool, PrintCodeCacheOnCompilation, false,                         \
1159           "Print the code cache memory usage each time a method is "        \
1160           "compiled")                                                       \
1161                                                                             \
1162   diagnostic(bool, PrintStubCode, false,                                    \
1163           "Print generated stub code")                                      \
1164                                                                             \
1165   product(bool, StackTraceInThrowable, true,                                \
1166           "Collect backtrace in throwable when exception happens")          \
1167                                                                             \
1168   product(bool, OmitStackTraceInFastThrow, true,                            \
1169           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1170                                                                             \
1171   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1172           "Print bytecode statistics when dumping profiler output")         \
1173                                                                             \
1174   product(bool, ProfilerRecordPC, false,                                    \
1175           "Collect ticks for each 16 byte interval of compiled code")       \
1176                                                                             \
1177   product(bool, ProfileVM, false,                                           \
1178           "Profile ticks that fall within VM (either in the VM Thread "     \
1179           "or VM code called through stubs)")                               \
1180                                                                             \
1181   product(bool, ProfileIntervals, false,                                    \
1182           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1183                                                                             \
1184   notproduct(bool, ProfilerCheckIntervals, false,                           \
1185           "Collect and print information on spacing of profiler ticks")     \
1186                                                                             \
1187   product(bool, PrintWarnings, true,                                        \
1188           "Print JVM warnings to output stream")                            \
1189                                                                             \
1190   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1191           "Print warnings for stalled SpinLocks")                           \
1192                                                                             \
1193   product(bool, RegisterFinalizersAtInit, true,                             \
1194           "Register finalizable objects at end of Object.<init> or "        \
1195           "after allocation")                                               \
1196                                                                             \
1197   develop(bool, RegisterReferences, true,                                   \
1198           "Tell whether the VM should register soft/weak/final/phantom "    \
1199           "references")                                                     \
1200                                                                             \
1201   develop(bool, IgnoreRewrites, false,                                      \
1202           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1203           "This is unsafe!")                                                \
1204                                                                             \
1205   develop(bool, PrintCodeCacheExtension, false,                             \
1206           "Print extension of code cache")                                  \
1207                                                                             \
1208   develop(bool, UsePrivilegedStack, true,                                   \
1209           "Enable the security JVM functions")                              \
1210                                                                             \
1211   develop(bool, ProtectionDomainVerification, true,                         \
1212           "Verify protection domain before resolution in system dictionary")\
1213                                                                             \
1214   product(bool, ClassUnloading, true,                                       \
1215           "Do unloading of classes")                                        \
1216                                                                             \
1217   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1218           "Do unloading of classes with a concurrent marking cycle")        \
1219                                                                             \
1220   develop(bool, DisableStartThread, false,                                  \
1221           "Disable starting of additional Java threads "                    \
1222           "(for debugging only)")                                           \
1223                                                                             \
1224   develop(bool, MemProfiling, false,                                        \
1225           "Write memory usage profiling to log file")                       \
1226                                                                             \
1227   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1228           "Print the system dictionary at exit")                            \
1229                                                                             \
1230   experimental(intx, PredictedLoadedClassCount, 0,                          \
1231           "Experimental: Tune loaded class cache starting size")            \
1232                                                                             \
1233   diagnostic(bool, UnsyncloadClass, false,                                  \
1234           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1235           "class loader must call VM synchronized for findClass "           \
1236           "and defineClass.")                                               \
1237                                                                             \
1238   product(bool, AlwaysLockClassLoader, false,                               \
1239           "Require the VM to acquire the class loader lock before calling " \
1240           "loadClass() even for class loaders registering "                 \
1241           "as parallel capable")                                            \
1242                                                                             \
1243   product(bool, AllowParallelDefineClass, false,                            \
1244           "Allow parallel defineClass requests for class loaders "          \
1245           "registering as parallel capable")                                \
1246                                                                             \
1247   product(bool, MustCallLoadClassInternal, false,                           \
1248           "Call loadClassInternal() rather than loadClass()")               \
1249                                                                             \
1250   product_pd(bool, DontYieldALot,                                           \
1251           "Throw away obvious excess yield calls")                          \
1252                                                                             \
1253   product_pd(bool, ConvertSleepToYield,                                     \
1254           "Convert sleep(0) to thread yield "                               \
1255           "(may be off for Solaris to improve GUI)")                        \
1256                                                                             \
1257   product(bool, ConvertYieldToSleep, false,                                 \
1258           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1259           "behavior")                                                       \
1260                                                                             \
1261   develop(bool, UseDetachedThreads, true,                                   \
1262           "Use detached threads that are recycled upon termination "        \
1263           "(for Solaris only)")                                             \
1264                                                                             \
1265   product(bool, UseLWPSynchronization, true,                                \
1266           "Use LWP-based instead of libthread-based synchronization "       \
1267           "(SPARC only)")                                                   \
1268                                                                             \
1269   experimental(ccstr, SyncKnobs, NULL,                                      \
1270                "(Unstable) Various monitor synchronization tunables")       \
1271                                                                             \
1272   experimental(intx, EmitSync, 0,                                           \
1273                "(Unsafe, Unstable) "                                        \
1274                "Control emission of inline sync fast-path code")            \
1275                                                                             \
1276   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1277                                                                             \
1278   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1279                                                                             \
1280   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1281                "Experimental Sync flags")                                   \
1282                                                                             \
1283   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1284                                                                             \
1285   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1286                                                                             \
1287   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1288                                                                             \
1289   experimental(intx, hashCode, 5,                                           \
1290                "(Unstable) select hashCode generation algorithm")           \
1291                                                                             \
1292   experimental(intx, WorkAroundNPTLTimedWaitHang, 0,                        \
1293                "(Unstable, Linux-specific) "                                \
1294                "avoid NPTL-FUTEX hang pthread_cond_timedwait")              \
1295                                                                             \
1296   product(bool, FilterSpuriousWakeups, true,                                \
1297           "When true prevents OS-level spurious, or premature, wakeups "    \
1298           "from Object.wait (Ignored for Windows)")                         \
1299                                                                             \
1300   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1301                                                                             \
1302   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1303                                                                             \
1304   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1305                                                                             \
1306   develop(bool, UsePthreads, false,                                         \
1307           "Use pthread-based instead of libthread-based synchronization "   \
1308           "(SPARC only)")                                                   \
1309                                                                             \
1310   product(bool, ReduceSignalUsage, false,                                   \
1311           "Reduce the use of OS signals in Java and/or the VM")             \
1312                                                                             \
1313   develop_pd(bool, ShareVtableStubs,                                        \
1314           "Share vtable stubs (smaller code but worse branch prediction")   \
1315                                                                             \
1316   develop(bool, LoadLineNumberTables, true,                                 \
1317           "Tell whether the class file parser loads line number tables")    \
1318                                                                             \
1319   develop(bool, LoadLocalVariableTables, true,                              \
1320           "Tell whether the class file parser loads local variable tables") \
1321                                                                             \
1322   develop(bool, LoadLocalVariableTypeTables, true,                          \
1323           "Tell whether the class file parser loads local variable type"    \
1324           "tables")                                                         \
1325                                                                             \
1326   product(bool, AllowUserSignalHandlers, false,                             \
1327           "Do not complain if the application installs signal handlers "    \
1328           "(Solaris & Linux only)")                                         \
1329                                                                             \
1330   product(bool, UseSignalChaining, true,                                    \
1331           "Use signal-chaining to invoke signal handlers installed "        \
1332           "by the application (Solaris & Linux only)")                      \
1333                                                                             \
1334   product(bool, UseAltSigs, false,                                          \
1335           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1336           "internal signals (Solaris only)")                                \
1337                                                                             \
1338   product(bool, AllowJNIEnvProxy, false,                                    \
1339           "Allow JNIEnv proxies for jdbx")                                  \
1340                                                                             \
1341   product(bool, JNIDetachReleasesMonitors, true,                            \
1342           "JNI DetachCurrentThread releases monitors owned by thread")      \
1343                                                                             \
1344   product(bool, RestoreMXCSROnJNICalls, false,                              \
1345           "Restore MXCSR when returning from JNI calls")                    \
1346                                                                             \
1347   product(bool, CheckJNICalls, false,                                       \
1348           "Verify all arguments to JNI calls")                              \
1349                                                                             \
1350   product(bool, CheckEndorsedAndExtDirs, false,                             \
1351           "Verify the endorsed and extension directories are not used")     \
1352                                                                             \
1353   product(bool, UseFastJNIAccessors, true,                                  \
1354           "Use optimized versions of Get<Primitive>Field")                  \
1355                                                                             \
1356   product(intx, MaxJNILocalCapacity, 65536,                                 \
1357           "Maximum allowable local JNI handle capacity to "                 \
1358           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1359           "where <= 0 is unlimited, default: 65536")                        \
1360                                                                             \
1361   product(bool, EagerXrunInit, false,                                       \
1362           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1363           "but not all -Xrun libraries may support the state of the VM "    \
1364           "at this time")                                                   \
1365                                                                             \
1366   product(bool, PreserveAllAnnotations, false,                              \
1367           "Preserve RuntimeInvisibleAnnotations as well "                   \
1368           "as RuntimeVisibleAnnotations")                                   \
1369                                                                             \
1370   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1371           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1372                                                                             \
1373   product(bool, UseXMMForArrayCopy, false,                                  \
1374           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1375                                                                             \
1376   product(intx, FieldsAllocationStyle, 1,                                   \
1377           "0 - type based with oops first, "                                \
1378           "1 - with oops last, "                                            \
1379           "2 - oops in super and sub classes are together")                 \
1380           range(0, 2)                                                       \
1381                                                                             \
1382   product(bool, CompactFields, true,                                        \
1383           "Allocate nonstatic fields in gaps between previous fields")      \
1384                                                                             \
1385   notproduct(bool, PrintFieldLayout, false,                                 \
1386           "Print field layout for each class")                              \
1387                                                                             \
1388   /* Need to limit the extent of the padding to reasonable size.          */\
1389   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1390   /* aggressive prefetching, while still leaving the room for segregating */\
1391   /* among the distinct pages.                                            */\
1392   product(intx, ContendedPaddingWidth, 128,                                 \
1393           "How many bytes to pad the fields/classes marked @Contended with")\
1394           range(0, 8192)                                                    \
1395           constraint(ContendedPaddingWidthConstraintFunc,AtParse)           \
1396                                                                             \
1397   product(bool, EnableContended, true,                                      \
1398           "Enable @Contended annotation support")                           \
1399                                                                             \
1400   product(bool, RestrictContended, true,                                    \
1401           "Restrict @Contended to trusted classes")                         \
1402                                                                             \
1403   product(bool, UseBiasedLocking, true,                                     \
1404           "Enable biased locking in JVM")                                   \
1405                                                                             \
1406   product(intx, BiasedLockingStartupDelay, 4000,                            \
1407           "Number of milliseconds to wait before enabling biased locking")  \
1408                                                                             \
1409   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1410           "Print statistics of biased locking in JVM")                      \
1411                                                                             \
1412   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1413           "Threshold of number of revocations per type to try to "          \
1414           "rebias all objects in the heap of that type")                    \
1415                                                                             \
1416   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1417           "Threshold of number of revocations per type to permanently "     \
1418           "revoke biases of all objects in the heap of that type")          \
1419                                                                             \
1420   product(intx, BiasedLockingDecayTime, 25000,                              \
1421           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1422           "type after previous bulk rebias")                                \
1423                                                                             \
1424   /* tracing */                                                             \
1425                                                                             \
1426   notproduct(bool, TraceRuntimeCalls, false,                                \
1427           "Trace run-time calls")                                           \
1428                                                                             \
1429   develop(bool, TraceJNICalls, false,                                       \
1430           "Trace JNI calls")                                                \
1431                                                                             \
1432   develop(bool, StressRewriter, false,                                      \
1433           "Stress linktime bytecode rewriting")                             \
1434                                                                             \
1435   notproduct(bool, TraceJVMCalls, false,                                    \
1436           "Trace JVM calls")                                                \
1437                                                                             \
1438   product(ccstr, TraceJVMTI, NULL,                                          \
1439           "Trace flags for JVMTI functions and events")                     \
1440                                                                             \
1441   /* This option can change an EMCP method into an obsolete method. */      \
1442   /* This can affect tests that except specific methods to be EMCP. */      \
1443   /* This option should be used with caution.                       */      \
1444   product(bool, StressLdcRewrite, false,                                    \
1445           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1446                                                                             \
1447   product(intx, TraceRedefineClasses, 0,                                    \
1448           "Trace level for JVMTI RedefineClasses")                          \
1449                                                                             \
1450   /* change to false by default sometime after Mustang */                   \
1451   product(bool, VerifyMergedCPBytecodes, true,                              \
1452           "Verify bytecodes after RedefineClasses constant pool merging")   \
1453                                                                             \
1454   develop(bool, TraceJNIHandleAllocation, false,                            \
1455           "Trace allocation/deallocation of JNI handle blocks")             \
1456                                                                             \
1457   develop(bool, TraceBytecodes, false,                                      \
1458           "Trace bytecode execution")                                       \
1459                                                                             \
1460   develop(bool, TraceClassInitialization, false,                            \
1461           "Trace class initialization")                                     \
1462                                                                             \
1463   product(bool, TraceExceptions, false,                                     \
1464           "Trace exceptions")                                               \
1465                                                                             \
1466   develop(bool, TraceICs, false,                                            \
1467           "Trace inline cache changes")                                     \
1468                                                                             \
1469   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1470           "Trace method invocation counter overflow")                       \
1471                                                                             \
1472   develop(bool, TraceInlineCacheClearing, false,                            \
1473           "Trace clearing of inline caches in nmethods")                    \
1474                                                                             \
1475   develop(bool, TraceDependencies, false,                                   \
1476           "Trace dependencies")                                             \
1477                                                                             \
1478   develop(bool, VerifyDependencies, trueInDebug,                            \
1479           "Exercise and verify the compilation dependency mechanism")       \
1480                                                                             \
1481   develop(bool, TraceNewOopMapGeneration, false,                            \
1482           "Trace OopMapGeneration")                                         \
1483                                                                             \
1484   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1485           "Trace OopMapGeneration: print detailed cell states")             \
1486                                                                             \
1487   develop(bool, TimeOopMap, false,                                          \
1488           "Time calls to GenerateOopMap::compute_map() in sum")             \
1489                                                                             \
1490   develop(bool, TimeOopMap2, false,                                         \
1491           "Time calls to GenerateOopMap::compute_map() individually")       \
1492                                                                             \
1493   develop(bool, TraceMonitorMismatch, false,                                \
1494           "Trace monitor matching failures during OopMapGeneration")        \
1495                                                                             \
1496   develop(bool, TraceOopMapRewrites, false,                                 \
1497           "Trace rewriting of method oops during oop map generation")       \
1498                                                                             \
1499   develop(bool, TraceSafepoint, false,                                      \
1500           "Trace safepoint operations")                                     \
1501                                                                             \
1502   develop(bool, TraceICBuffer, false,                                       \
1503           "Trace usage of IC buffer")                                       \
1504                                                                             \
1505   develop(bool, TraceCompiledIC, false,                                     \
1506           "Trace changes of compiled IC")                                   \
1507                                                                             \
1508   notproduct(bool, TraceZapDeadLocals, false,                               \
1509           "Trace zapping dead locals")                                      \
1510                                                                             \
1511   develop(bool, TraceStartupTime, false,                                    \
1512           "Trace setup time")                                               \
1513                                                                             \
1514   develop(bool, TraceProtectionDomainVerification, false,                   \
1515           "Trace protection domain verification")                           \
1516                                                                             \
1517   develop(bool, TraceClearedExceptions, false,                              \
1518           "Print when an exception is forcibly cleared")                    \
1519                                                                             \
1520   product(bool, TraceClassResolution, false,                                \
1521           "Trace all constant pool resolutions (for debugging)")            \
1522                                                                             \
1523   product(bool, TraceBiasedLocking, false,                                  \
1524           "Trace biased locking in JVM")                                    \
1525                                                                             \
1526   product(bool, TraceMonitorInflation, false,                               \
1527           "Trace monitor inflation in JVM")                                 \
1528                                                                             \
1529   /* gc */                                                                  \
1530                                                                             \
1531   product(bool, UseSerialGC, false,                                         \
1532           "Use the Serial garbage collector")                               \
1533                                                                             \
1534   product(bool, UseG1GC, false,                                             \
1535           "Use the Garbage-First garbage collector")                        \
1536                                                                             \
1537   product(bool, UseParallelGC, false,                                       \
1538           "Use the Parallel Scavenge garbage collector")                    \
1539                                                                             \
1540   product(bool, UseParallelOldGC, false,                                    \
1541           "Use the Parallel Old garbage collector")                         \
1542                                                                             \
1543   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1544           "How often should we maximally compact the heap (not allowing "   \
1545           "any dead space)")                                                \
1546                                                                             \
1547   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1548           "The collection count for the first maximum compaction")          \
1549                                                                             \
1550   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1551           "Use maximum compaction in the Parallel Old garbage collector "   \
1552           "for a system GC")                                                \
1553                                                                             \
1554   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1555           "The mean used by the parallel compact dead wood "                \
1556           "limiter (a number between 0-100)")                               \
1557           range(0, 100)                                                     \
1558                                                                             \
1559   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1560           "The standard deviation used by the parallel compact dead wood "  \
1561           "limiter (a number between 0-100)")                               \
1562           range(0, 100)                                                     \
1563                                                                             \
1564   product(uint, ParallelGCThreads, 0,                                       \
1565           "Number of parallel threads parallel gc will use")                \
1566                                                                             \
1567   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1568           "Dynamically choose the number of parallel threads "              \
1569           "parallel gc will use")                                           \
1570                                                                             \
1571   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1572           "Force dynamic selection of the number of "                       \
1573           "parallel threads parallel gc will use to aid debugging")         \
1574                                                                             \
1575   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1576           "Size of heap (bytes) per GC thread used in calculating the "     \
1577           "number of GC threads")                                           \
1578           range((uintx)os::vm_page_size(), max_uintx)                       \
1579                                                                             \
1580   product(bool, TraceDynamicGCThreads, false,                               \
1581           "Trace the dynamic GC thread usage")                              \
1582                                                                             \
1583   develop(bool, ParallelOldGCSplitALot, false,                              \
1584           "Provoke splitting (copying data from a young gen space to "      \
1585           "multiple destination spaces)")                                   \
1586                                                                             \
1587   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1588           "How often to provoke splitting a young gen space")               \
1589           range(0, max_uintx)                                               \
1590                                                                             \
1591   product(uint, ConcGCThreads, 0,                                           \
1592           "Number of threads concurrent gc will use")                       \
1593                                                                             \
1594   product(size_t, YoungPLABSize, 4096,                                      \
1595           "Size of young gen promotion LAB's (in HeapWords)")               \
1596           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
1597                                                                             \
1598   product(size_t, OldPLABSize, 1024,                                        \
1599           "Size of old gen promotion LAB's (in HeapWords), or Number        \
1600           of blocks to attempt to claim when refilling CMS LAB's")          \
1601                                                                             \
1602   product(uintx, GCTaskTimeStampEntries, 200,                               \
1603           "Number of time stamp entries per gc worker thread")              \
1604           range(1, max_uintx)                                               \
1605                                                                             \
1606   product(bool, AlwaysTenure, false,                                        \
1607           "Always tenure objects in eden (ParallelGC only)")                \
1608                                                                             \
1609   product(bool, NeverTenure, false,                                         \
1610           "Never tenure objects in eden, may tenure on overflow "           \
1611           "(ParallelGC only)")                                              \
1612                                                                             \
1613   product(bool, ScavengeBeforeFullGC, true,                                 \
1614           "Scavenge youngest generation before each full GC.")              \
1615                                                                             \
1616   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1617           "Allow scavenges to occur when to-space contains objects")        \
1618                                                                             \
1619   product(bool, UseConcMarkSweepGC, false,                                  \
1620           "Use Concurrent Mark-Sweep GC in the old generation")             \
1621                                                                             \
1622   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1623           "A System.gc() request invokes a concurrent collection; "         \
1624           "(effective only when using concurrent collectors)")              \
1625                                                                             \
1626   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1627           "A System.gc() request invokes a concurrent collection and "      \
1628           "also unloads classes during such a concurrent gc cycle "         \
1629           "(effective only when UseConcMarkSweepGC)")                       \
1630                                                                             \
1631   product(bool, GCLockerInvokesConcurrent, false,                           \
1632           "The exit of a JNI critical section necessitating a scavenge, "   \
1633           "also kicks off a background concurrent collection")              \
1634                                                                             \
1635   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1636           "How much the GC can expand the eden by while the GC locker "     \
1637           "is active (as a percentage)")                                    \
1638           range(0, 100)                                                     \
1639                                                                             \
1640   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1641           "Number of times to retry allocations when "                      \
1642           "blocked by the GC locker")                                       \
1643                                                                             \
1644   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1645           "Use adaptive free lists in the CMS generation")                  \
1646                                                                             \
1647   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1648           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1649                                                                             \
1650   product(bool, UseCMSBestFit, true,                                        \
1651           "Use CMS best fit allocation strategy")                           \
1652                                                                             \
1653   product(bool, UseParNewGC, false,                                         \
1654           "Use parallel threads in the new generation")                     \
1655                                                                             \
1656   product(bool, PrintTaskqueue, false,                                      \
1657           "Print taskqueue statistics for parallel collectors")             \
1658                                                                             \
1659   product(bool, PrintTerminationStats, false,                               \
1660           "Print termination statistics for parallel collectors")           \
1661                                                                             \
1662   product(uintx, ParallelGCBufferWastePct, 10,                              \
1663           "Wasted fraction of parallel allocation buffer")                  \
1664           range(0, 100)                                                     \
1665                                                                             \
1666   product(uintx, TargetPLABWastePct, 10,                                    \
1667           "Target wasted space in last buffer as percent of overall "       \
1668           "allocation")                                                     \
1669           range(1, 100)                                                     \
1670                                                                             \
1671   product(uintx, PLABWeight, 75,                                            \
1672           "Percentage (0-100) used to weight the current sample when "      \
1673           "computing exponentially decaying average for ResizePLAB")        \
1674           range(0, 100)                                                     \
1675                                                                             \
1676   product(bool, ResizePLAB, true,                                           \
1677           "Dynamically resize (survivor space) promotion LAB's")            \
1678                                                                             \
1679   product(bool, PrintPLAB, false,                                           \
1680           "Print (survivor space) promotion LAB's sizing decisions")        \
1681                                                                             \
1682   product(intx, ParGCArrayScanChunk, 50,                                    \
1683           "Scan a subset of object array and push remainder, if array is "  \
1684           "bigger than this")                                               \
1685           range(1, max_intx)                                                \
1686                                                                             \
1687   product(bool, ParGCUseLocalOverflow, false,                               \
1688           "Instead of a global overflow list, use local overflow stacks")   \
1689                                                                             \
1690   product(bool, ParGCTrimOverflow, true,                                    \
1691           "Eagerly trim the local overflow lists "                          \
1692           "(when ParGCUseLocalOverflow)")                                   \
1693                                                                             \
1694   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1695           "Simulate work queue overflow in ParNew")                         \
1696                                                                             \
1697   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1698           "An `interval' counter that determines how frequently "           \
1699           "we simulate overflow; a smaller number increases frequency")     \
1700                                                                             \
1701   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1702           "The desired number of objects to claim from the overflow list")  \
1703                                                                             \
1704   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1705           "The number of strides per worker thread that we divide up the "  \
1706           "card table scanning work into")                                  \
1707           range(1, max_uintx)                                               \
1708                                                                             \
1709   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1710           "The number of cards in each chunk of the parallel chunks used "  \
1711           "during card table scanning")                                     \
1712           range(1, max_intx)                                                \
1713                                                                             \
1714   product(uintx, OldPLABWeight, 50,                                         \
1715           "Percentage (0-100) used to weight the current sample when "      \
1716           "computing exponentially decaying average for resizing "          \
1717           "OldPLABSize")                                                    \
1718           range(0, 100)                                                     \
1719                                                                             \
1720   product(bool, ResizeOldPLAB, true,                                        \
1721           "Dynamically resize (old gen) promotion LAB's")                   \
1722                                                                             \
1723   product(bool, PrintOldPLAB, false,                                        \
1724           "Print (old gen) promotion LAB's sizing decisions")               \
1725                                                                             \
1726   product(size_t, CMSOldPLABMax, 1024,                                      \
1727           "Maximum size of CMS gen promotion LAB caches per worker "        \
1728           "per block size")                                                 \
1729           range(1, max_uintx)                                               \
1730                                                                             \
1731   product(size_t, CMSOldPLABMin, 16,                                        \
1732           "Minimum size of CMS gen promotion LAB caches per worker "        \
1733           "per block size")                                                 \
1734           range(1, max_uintx)                                               \
1735           constraint(CMSOldPLABMinConstraintFunc,AfterErgo)                 \
1736                                                                             \
1737   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1738           "Nominal number of refills of CMS gen promotion LAB cache "       \
1739           "per worker per block size")                                      \
1740           range(1, max_uintx)                                               \
1741                                                                             \
1742   product(bool, CMSOldPLABResizeQuicker, false,                             \
1743           "React on-the-fly during a scavenge to a sudden "                 \
1744           "change in block demand rate")                                    \
1745                                                                             \
1746   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1747           "The tolerance of the phase-change detector for on-the-fly "      \
1748           "PLAB resizing during a scavenge")                                \
1749           range(1, max_uintx)                                               \
1750                                                                             \
1751   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1752           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1753           "during a scavenge")                                              \
1754                                                                             \
1755   product(bool, AlwaysPreTouch, false,                                      \
1756           "Force all freshly committed pages to be pre-touched")            \
1757                                                                             \
1758   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1759           "The maximum size of young gen chosen by default per GC worker "  \
1760           "thread available")                                               \
1761           range(1, max_uintx)                                               \
1762                                                                             \
1763   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1764           "Percentage (0-100) used to add conservatism when computing the " \
1765           "duty cycle")                                                     \
1766           range(0, 100)                                                     \
1767                                                                             \
1768   product(uintx, CMSExpAvgFactor, 50,                                       \
1769           "Percentage (0-100) used to weight the current sample when "      \
1770           "computing exponential averages for CMS statistics")              \
1771           range(0, 100)                                                     \
1772                                                                             \
1773   product(uintx, CMS_FLSWeight, 75,                                         \
1774           "Percentage (0-100) used to weight the current sample when "      \
1775           "computing exponentially decaying averages for CMS FLS "          \
1776           "statistics")                                                     \
1777           range(0, 100)                                                     \
1778                                                                             \
1779   product(uintx, CMS_FLSPadding, 1,                                         \
1780           "The multiple of deviation from mean to use for buffering "       \
1781           "against volatility in free list demand")                         \
1782                                                                             \
1783   product(uintx, FLSCoalescePolicy, 2,                                      \
1784           "CMS: aggressiveness level for coalescing, increasing "           \
1785           "from 0 to 4")                                                    \
1786           range(0, 4)                                                       \
1787                                                                             \
1788   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1789           "CMS: larger free blocks are always available for coalescing")    \
1790                                                                             \
1791   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1792           "CMS: the smaller the percentage the greater the coalescing "     \
1793           "force")                                                          \
1794                                                                             \
1795   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1796           "CMS: the factor by which to inflate estimated demand of small "  \
1797           "block sizes to prevent coalescing with an adjoining block")      \
1798                                                                             \
1799   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1800           "CMS: the factor by which to inflate estimated demand of large "  \
1801           "block sizes to prevent coalescing with an adjoining block")      \
1802                                                                             \
1803   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1804           "CMS: the factor by which to inflate estimated demand of small "  \
1805           "block sizes to prevent splitting to supply demand for smaller "  \
1806           "blocks")                                                         \
1807                                                                             \
1808   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1809           "CMS: the factor by which to inflate estimated demand of large "  \
1810           "block sizes to prevent splitting to supply demand for smaller "  \
1811           "blocks")                                                         \
1812                                                                             \
1813   product(bool, CMSExtrapolateSweep, false,                                 \
1814           "CMS: cushion for block demand during sweep")                     \
1815                                                                             \
1816   product(uintx, CMS_SweepWeight, 75,                                       \
1817           "Percentage (0-100) used to weight the current sample when "      \
1818           "computing exponentially decaying average for inter-sweep "       \
1819           "duration")                                                       \
1820           range(0, 100)                                                     \
1821                                                                             \
1822   product(uintx, CMS_SweepPadding, 1,                                       \
1823           "The multiple of deviation from mean to use for buffering "       \
1824           "against volatility in inter-sweep duration")                     \
1825                                                                             \
1826   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1827           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1828           "duration exceeds this threshold in milliseconds")                \
1829                                                                             \
1830   product(bool, CMSClassUnloadingEnabled, true,                             \
1831           "Whether class unloading enabled when using CMS GC")              \
1832                                                                             \
1833   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1834           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1835           "count for which classes may not be unloaded")                    \
1836                                                                             \
1837   develop(intx, CMSDictionaryChoice, 0,                                     \
1838           "Use BinaryTreeDictionary as default in the CMS generation")      \
1839                                                                             \
1840   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1841           "Replenish an indexed free list with this number of chunks")      \
1842                                                                             \
1843   product(bool, CMSReplenishIntermediate, true,                             \
1844           "Replenish all intermediate free-list caches")                    \
1845                                                                             \
1846   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1847           "When satisfying batched demand, split blocks from the "          \
1848           "IndexedFreeList whose size is a multiple of requested size")     \
1849                                                                             \
1850   product(bool, CMSLoopWarn, false,                                         \
1851           "Warn in case of excessive CMS looping")                          \
1852                                                                             \
1853   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1854           "Restore preserved marks early")                                  \
1855                                                                             \
1856   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1857           "Size of marking stack")                                          \
1858                                                                             \
1859   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1860           "Maximum size of marking stack")                                  \
1861           range(1, (max_jint - 1))                                          \
1862                                                                             \
1863   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1864           "Simulate frequent marking stack / work queue overflow")          \
1865                                                                             \
1866   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1867           "An \"interval\" counter that determines how frequently "         \
1868           "to simulate overflow; a smaller number increases frequency")     \
1869                                                                             \
1870   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1871           "Maximum number of abortable preclean iterations, if > 0")        \
1872                                                                             \
1873   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1874           "Maximum time in abortable preclean (in milliseconds)")           \
1875                                                                             \
1876   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1877           "Nominal minimum work per abortable preclean iteration")          \
1878                                                                             \
1879   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1880           "Time that we sleep between iterations when not given "           \
1881           "enough work per iteration")                                      \
1882                                                                             \
1883   product(size_t, CMSRescanMultiple, 32,                                    \
1884           "Size (in cards) of CMS parallel rescan task")                    \
1885           range(1, max_uintx)                                               \
1886                                                                             \
1887   product(size_t, CMSConcMarkMultiple, 32,                                  \
1888           "Size (in cards) of CMS concurrent MT marking task")              \
1889           range(1, max_uintx)                                               \
1890                                                                             \
1891   product(bool, CMSAbortSemantics, false,                                   \
1892           "Whether abort-on-overflow semantics is implemented")             \
1893                                                                             \
1894   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1895           "Use the parallel initial mark.")                                 \
1896                                                                             \
1897   product(bool, CMSParallelRemarkEnabled, true,                             \
1898           "Whether parallel remark enabled (only if ParNewGC)")             \
1899                                                                             \
1900   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1901           "Whether parallel remark of survivor space "                      \
1902           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1903                                                                             \
1904   product(bool, CMSPLABRecordAlways, true,                                  \
1905           "Always record survivor space PLAB boundaries (effective only "   \
1906           "if CMSParallelSurvivorRemarkEnabled)")                           \
1907                                                                             \
1908   product(bool, CMSEdenChunksRecordAlways, true,                            \
1909           "Always record eden chunks used for the parallel initial mark "   \
1910           "or remark of eden")                                              \
1911                                                                             \
1912   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1913           "Print the eden and the survivor chunks used for the parallel "   \
1914           "initial mark or remark of the eden/survivor spaces")             \
1915                                                                             \
1916   product(bool, CMSConcurrentMTEnabled, true,                               \
1917           "Whether multi-threaded concurrent work enabled "                 \
1918           "(effective only if ParNewGC)")                                   \
1919                                                                             \
1920   product(bool, CMSPrecleaningEnabled, true,                                \
1921           "Whether concurrent precleaning enabled")                         \
1922                                                                             \
1923   product(uintx, CMSPrecleanIter, 3,                                        \
1924           "Maximum number of precleaning iteration passes")                 \
1925           range(0, 9)                                                       \
1926                                                                             \
1927   product(uintx, CMSPrecleanDenominator, 3,                                 \
1928           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1929           "ratio")                                                          \
1930           range(1, max_uintx)                                               \
1931           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1932                                                                             \
1933   product(uintx, CMSPrecleanNumerator, 2,                                   \
1934           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1935           "ratio")                                                          \
1936           range(0, max_uintx-1)                                             \
1937           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1938                                                                             \
1939   product(bool, CMSPrecleanRefLists1, true,                                 \
1940           "Preclean ref lists during (initial) preclean phase")             \
1941                                                                             \
1942   product(bool, CMSPrecleanRefLists2, false,                                \
1943           "Preclean ref lists during abortable preclean phase")             \
1944                                                                             \
1945   product(bool, CMSPrecleanSurvivors1, false,                               \
1946           "Preclean survivors during (initial) preclean phase")             \
1947                                                                             \
1948   product(bool, CMSPrecleanSurvivors2, true,                                \
1949           "Preclean survivors during abortable preclean phase")             \
1950                                                                             \
1951   product(uintx, CMSPrecleanThreshold, 1000,                                \
1952           "Do not iterate again if number of dirty cards is less than this")\
1953           range(100, max_uintx)                                             \
1954                                                                             \
1955   product(bool, CMSCleanOnEnter, true,                                      \
1956           "Clean-on-enter optimization for reducing number of dirty cards") \
1957                                                                             \
1958   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1959           "Choose variant (1,2) of verification following remark")          \
1960           range(1, 2)                                                       \
1961                                                                             \
1962   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1963           "If Eden size is below this, do not try to schedule remark")      \
1964                                                                             \
1965   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1966           "The Eden occupancy percentage (0-100) at which "                 \
1967           "to try and schedule remark pause")                               \
1968           range(0, 100)                                                     \
1969                                                                             \
1970   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1971           "Start sampling eden top at least before young gen "              \
1972           "occupancy reaches 1/<ratio> of the size at which "               \
1973           "we plan to schedule remark")                                     \
1974           range(1, max_uintx)                                               \
1975                                                                             \
1976   product(uintx, CMSSamplingGrain, 16*K,                                    \
1977           "The minimum distance between eden samples for CMS (see above)")  \
1978           range(1, max_uintx)                                               \
1979                                                                             \
1980   product(bool, CMSScavengeBeforeRemark, false,                             \
1981           "Attempt scavenge before the CMS remark step")                    \
1982                                                                             \
1983   develop(bool, CMSTraceSweeper, false,                                     \
1984           "Trace some actions of the CMS sweeper")                          \
1985                                                                             \
1986   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1987           "Don't drain below this size per parallel worker/thief")          \
1988                                                                             \
1989   manageable(intx, CMSWaitDuration, 2000,                                   \
1990           "Time in milliseconds that CMS thread waits for young GC")        \
1991                                                                             \
1992   develop(uintx, CMSCheckInterval, 1000,                                    \
1993           "Interval in milliseconds that CMS thread checks if it "          \
1994           "should start a collection cycle")                                \
1995                                                                             \
1996   product(bool, CMSYield, true,                                             \
1997           "Yield between steps of CMS")                                     \
1998                                                                             \
1999   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
2000           "Bitmap operations should process at most this many bits "        \
2001           "between yields")                                                 \
2002           range(1, max_uintx)                                               \
2003                                                                             \
2004   product(bool, CMSDumpAtPromotionFailure, false,                           \
2005           "Dump useful information about the state of the CMS old "         \
2006           "generation upon a promotion failure")                            \
2007                                                                             \
2008   product(bool, CMSPrintChunksInDump, false,                                \
2009           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
2010           "more detailed information about the free chunks")                \
2011                                                                             \
2012   product(bool, CMSPrintObjectsInDump, false,                               \
2013           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
2014           "more detailed information about the allocated objects")          \
2015                                                                             \
2016   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
2017           "Verify that all references across the FLS boundary "             \
2018           "are to valid objects")                                           \
2019                                                                             \
2020   diagnostic(bool, FLSVerifyLists, false,                                   \
2021           "Do lots of (expensive) FreeListSpace verification")              \
2022                                                                             \
2023   diagnostic(bool, FLSVerifyIndexTable, false,                              \
2024           "Do lots of (expensive) FLS index table verification")            \
2025                                                                             \
2026   develop(bool, FLSVerifyDictionary, false,                                 \
2027           "Do lots of (expensive) FLS dictionary verification")             \
2028                                                                             \
2029   develop(bool, VerifyBlockOffsetArray, false,                              \
2030           "Do (expensive) block offset array verification")                 \
2031                                                                             \
2032   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
2033           "Maintain _unallocated_block in BlockOffsetArray "                \
2034           "(currently applicable only to CMS collector)")                   \
2035                                                                             \
2036   develop(bool, TraceCMSState, false,                                       \
2037           "Trace the state of the CMS collection")                          \
2038                                                                             \
2039   product(intx, RefDiscoveryPolicy, 0,                                      \
2040           "Select type of reference discovery policy: "                     \
2041           "reference-based(0) or referent-based(1)")                        \
2042           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
2043                 ReferenceProcessor::DiscoveryPolicyMax)                     \
2044                                                                             \
2045   product(bool, ParallelRefProcEnabled, false,                              \
2046           "Enable parallel reference processing whenever possible")         \
2047                                                                             \
2048   product(bool, ParallelRefProcBalancingEnabled, true,                      \
2049           "Enable balancing of reference processing queues")                \
2050                                                                             \
2051   product(uintx, CMSTriggerRatio, 80,                                       \
2052           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
2053           "allocated before a CMS collection cycle commences")              \
2054           range(0, 100)                                                     \
2055                                                                             \
2056   product(uintx, CMSBootstrapOccupancy, 50,                                 \
2057           "Percentage CMS generation occupancy at which to "                \
2058           "initiate CMS collection for bootstrapping collection stats")     \
2059           range(0, 100)                                                     \
2060                                                                             \
2061   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
2062           "Percentage CMS generation occupancy to start a CMS collection "  \
2063           "cycle. A negative value means that CMSTriggerRatio is used")     \
2064           range(min_intx, 100)                                              \
2065                                                                             \
2066   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
2067           "Percentage of the (entire) heap occupancy to start a "           \
2068           "concurrent GC cycle. It is used by GCs that trigger a "          \
2069           "concurrent GC cycle based on the occupancy of the entire heap, " \
2070           "not just one of the generations (e.g., G1). A value of 0 "       \
2071           "denotes 'do constant GC cycles'.")                               \
2072           range(0, 100)                                                     \
2073                                                                             \
2074   manageable(intx, CMSTriggerInterval, -1,                                  \
2075           "Commence a CMS collection cycle (at least) every so many "       \
2076           "milliseconds (0 permanently, -1 disabled)")                      \
2077           range(-1, max_intx)                                               \
2078                                                                             \
2079   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
2080           "Only use occupancy as a criterion for starting a CMS collection")\
2081                                                                             \
2082   product(uintx, CMSIsTooFullPercentage, 98,                                \
2083           "An absolute ceiling above which CMS will always consider the "   \
2084           "unloading of classes when class unloading is enabled")           \
2085           range(0, 100)                                                     \
2086                                                                             \
2087   develop(bool, CMSTestInFreeList, false,                                   \
2088           "Check if the coalesced range is already in the "                 \
2089           "free lists as claimed")                                          \
2090                                                                             \
2091   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
2092           "Check that all the garbage collected was returned to the "       \
2093           "free lists")                                                     \
2094                                                                             \
2095   notproduct(bool, ScavengeALot, false,                                     \
2096           "Force scavenge at every Nth exit from the runtime system "       \
2097           "(N=ScavengeALotInterval)")                                       \
2098                                                                             \
2099   develop(bool, FullGCALot, false,                                          \
2100           "Force full gc at every Nth exit from the runtime system "        \
2101           "(N=FullGCALotInterval)")                                         \
2102                                                                             \
2103   notproduct(bool, GCALotAtAllSafepoints, false,                            \
2104           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
2105                                                                             \
2106   product(bool, PrintPromotionFailure, false,                               \
2107           "Print additional diagnostic information following "              \
2108           "promotion failure")                                              \
2109                                                                             \
2110   notproduct(bool, PromotionFailureALot, false,                             \
2111           "Use promotion failure handling on every youngest generation "    \
2112           "collection")                                                     \
2113                                                                             \
2114   develop(uintx, PromotionFailureALotCount, 1000,                           \
2115           "Number of promotion failures occurring at PLAB "     \
2116           "refill attempts (ParNew) or promotion attempts "                 \
2117           "(other young collectors)")                                       \
2118                                                                             \
2119   develop(uintx, PromotionFailureALotInterval, 5,                           \
2120           "Total collections between promotion failures a lot")             \
2121                                                                             \
2122   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2123           "Sleep time when sleep is used for yields")                       \
2124                                                                             \
2125   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2126           "Number of yields before a sleep is done during work stealing")   \
2127                                                                             \
2128   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2129           "Number of iterations in a spin loop between checks on "          \
2130           "time out of hard spin")                                          \
2131                                                                             \
2132   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2133           "Ratio of hard spins to calls to yield")                          \
2134                                                                             \
2135   develop(uintx, ObjArrayMarkingStride, 512,                                \
2136           "Number of object array elements to push onto the marking stack " \
2137           "before pushing a continuation entry")                            \
2138                                                                             \
2139   develop(bool, MetadataAllocationFailALot, false,                          \
2140           "Fail metadata allocations at intervals controlled by "           \
2141           "MetadataAllocationFailALotInterval")                             \
2142                                                                             \
2143   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2144           "Metadata allocation failure a lot interval")                     \
2145                                                                             \
2146   develop(bool, TraceMetadataChunkAllocation, false,                        \
2147           "Trace chunk metadata allocations")                               \
2148                                                                             \
2149   product(bool, TraceMetadataHumongousAllocation, false,                    \
2150           "Trace humongous metadata allocations")                           \
2151                                                                             \
2152   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
2153           "Trace virtual space metadata allocations")                       \
2154                                                                             \
2155   notproduct(bool, ExecuteInternalVMTests, false,                           \
2156           "Enable execution of internal VM tests")                          \
2157                                                                             \
2158   notproduct(bool, VerboseInternalVMTests, false,                           \
2159           "Turn on logging for internal VM tests.")                         \
2160                                                                             \
2161   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2162                                                                             \
2163   product_pd(bool, ResizeTLAB,                                              \
2164           "Dynamically resize TLAB size for threads")                       \
2165                                                                             \
2166   product(bool, ZeroTLAB, false,                                            \
2167           "Zero out the newly created TLAB")                                \
2168                                                                             \
2169   product(bool, FastTLABRefill, true,                                       \
2170           "Use fast TLAB refill code")                                      \
2171                                                                             \
2172   product(bool, PrintTLAB, false,                                           \
2173           "Print various TLAB related information")                         \
2174                                                                             \
2175   product(bool, TLABStats, true,                                            \
2176           "Provide more detailed and expensive TLAB statistics "            \
2177           "(with PrintTLAB)")                                               \
2178                                                                             \
2179   product_pd(bool, NeverActAsServerClassMachine,                            \
2180           "Never act like a server-class machine")                          \
2181                                                                             \
2182   product(bool, AlwaysActAsServerClassMachine, false,                       \
2183           "Always act like a server-class machine")                         \
2184                                                                             \
2185   product_pd(uint64_t, MaxRAM,                                              \
2186           "Real memory size (in bytes) used to set maximum heap size")      \
2187                                                                             \
2188   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2189           "Maximum ergonomically set heap size (in bytes); zero means use " \
2190           "MaxRAM / MaxRAMFraction")                                        \
2191                                                                             \
2192   product(uintx, MaxRAMFraction, 4,                                         \
2193           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2194           "size")                                                           \
2195           range(1, max_uintx)                                               \
2196                                                                             \
2197   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2198           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2199           "size; deprecated: to be renamed to MaxRAMFraction")              \
2200           range(1, max_uintx)                                               \
2201                                                                             \
2202   product(uintx, MinRAMFraction, 2,                                         \
2203           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2204           "size on systems with small physical memory size")                \
2205           range(1, max_uintx)                                               \
2206                                                                             \
2207   product(uintx, InitialRAMFraction, 64,                                    \
2208           "Fraction (1/n) of real memory used for initial heap size")       \
2209           range(1, max_uintx)                                               \
2210                                                                             \
2211   develop(uintx, MaxVirtMemFraction, 2,                                     \
2212           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2213           "determining maximum heap size")                                  \
2214                                                                             \
2215   product(bool, UseAutoGCSelectPolicy, false,                               \
2216           "Use automatic collection selection policy")                      \
2217                                                                             \
2218   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2219           "Automatic GC selection pause threshold in milliseconds")         \
2220                                                                             \
2221   product(bool, UseAdaptiveSizePolicy, true,                                \
2222           "Use adaptive generation sizing policies")                        \
2223                                                                             \
2224   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2225           "Use adaptive survivor sizing policies")                          \
2226                                                                             \
2227   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2228           "Use adaptive young-old sizing policies at minor collections")    \
2229                                                                             \
2230   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2231           "Use adaptive young-old sizing policies at major collections")    \
2232                                                                             \
2233   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2234           "Include statistics from System.gc() for adaptive size policy")   \
2235                                                                             \
2236   product(bool, UseAdaptiveGCBoundary, false,                               \
2237           "Allow young-old boundary to move")                               \
2238                                                                             \
2239   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2240           "Trace young-old boundary moves")                                 \
2241                                                                             \
2242   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2243           "Resize the virtual spaces of the young or old generations")      \
2244                                                                             \
2245   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2246           "Policy for changing generation size for throughput goals")       \
2247                                                                             \
2248   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2249           "Adjust tenured generation to achieve a minor pause goal")        \
2250                                                                             \
2251   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2252           "Adjust young generation to achieve a major pause goal")          \
2253                                                                             \
2254   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2255           "Number of steps where heuristics is used before data is used")   \
2256                                                                             \
2257   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2258           "Number of collections before the adaptive sizing is started")    \
2259                                                                             \
2260   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2261           "Collection interval for printing information; zero means never") \
2262                                                                             \
2263   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2264           "Use adaptive minimum footprint as a goal")                       \
2265                                                                             \
2266   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2267           "Weight given to exponential resizing, between 0 and 100")        \
2268           range(0, 100)                                                     \
2269                                                                             \
2270   product(uintx, AdaptiveTimeWeight,       25,                              \
2271           "Weight given to time in adaptive policy, between 0 and 100")     \
2272           range(0, 100)                                                     \
2273                                                                             \
2274   product(uintx, PausePadding, 1,                                           \
2275           "How much buffer to keep for pause time")                         \
2276                                                                             \
2277   product(uintx, PromotedPadding, 3,                                        \
2278           "How much buffer to keep for promotion failure")                  \
2279                                                                             \
2280   product(uintx, SurvivorPadding, 3,                                        \
2281           "How much buffer to keep for survivor overflow")                  \
2282                                                                             \
2283   product(uintx, ThresholdTolerance, 10,                                    \
2284           "Allowed collection cost difference between generations")         \
2285           range(0, 100)                                                     \
2286                                                                             \
2287   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2288           "If collection costs are within margin, reduce both by full "     \
2289           "delta")                                                          \
2290                                                                             \
2291   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2292           "Adaptive size percentage change in young generation")            \
2293           range(0, 100)                                                     \
2294                                                                             \
2295   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2296           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2297           range(0, 100)                                                     \
2298                                                                             \
2299   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2300           "Decay factor to YoungedGenerationSizeSupplement")                \
2301           range(1, max_uintx)                                               \
2302                                                                             \
2303   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2304           "Adaptive size percentage change in tenured generation")          \
2305           range(0, 100)                                                     \
2306                                                                             \
2307   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2308           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2309           range(0, 100)                                                     \
2310                                                                             \
2311   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2312           "Decay factor to TenuredGenerationSizeIncrement")                 \
2313           range(1, max_uintx)                                               \
2314                                                                             \
2315   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2316           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2317           "or (G1 Only) the maximum GC time per MMU time slice")            \
2318                                                                             \
2319   product(uintx, GCPauseIntervalMillis, 0,                                  \
2320           "Time slice for MMU specification")                               \
2321                                                                             \
2322   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2323           "Adaptive size policy maximum GC minor pause time goal "          \
2324           "in millisecond")                                                 \
2325                                                                             \
2326   product(uintx, GCTimeRatio, 99,                                           \
2327           "Adaptive size policy application time to GC time ratio")         \
2328                                                                             \
2329   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2330           "Adaptive size scale down factor for shrinking")                  \
2331           range(1, max_uintx)                                               \
2332                                                                             \
2333   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2334           "Adaptive size decays the major cost for long major intervals")   \
2335                                                                             \
2336   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2337           "Time scale over which major costs decay")                        \
2338                                                                             \
2339   product(uintx, MinSurvivorRatio, 3,                                       \
2340           "Minimum ratio of young generation/survivor space size")          \
2341                                                                             \
2342   product(uintx, InitialSurvivorRatio, 8,                                   \
2343           "Initial ratio of young generation/survivor space size")          \
2344                                                                             \
2345   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2346           "Estimate of footprint other than Java Heap")                     \
2347                                                                             \
2348   product(bool, UseGCOverheadLimit, true,                                   \
2349           "Use policy to limit of proportion of time spent in GC "          \
2350           "before an OutOfMemory error is thrown")                          \
2351                                                                             \
2352   product(uintx, GCTimeLimit, 98,                                           \
2353           "Limit of the proportion of time spent in GC before "             \
2354           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2355           range(0, 100)                                                     \
2356                                                                             \
2357   product(uintx, GCHeapFreeLimit, 2,                                        \
2358           "Minimum percentage of free space after a full GC before an "     \
2359           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2360           range(0, 100)                                                     \
2361                                                                             \
2362   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2363           "Number of consecutive collections before gc time limit fires")   \
2364                                                                             \
2365   product(bool, PrintAdaptiveSizePolicy, false,                             \
2366           "Print information about AdaptiveSizePolicy")                     \
2367                                                                             \
2368   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2369           "How far ahead to prefetch destination area (<= 0 means off)")    \
2370                                                                             \
2371   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2372           "How far ahead to prefetch scan area (<= 0 means off)")           \
2373                                                                             \
2374   product(intx, PrefetchFieldsAhead, -1,                                    \
2375           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2376                                                                             \
2377   diagnostic(bool, VerifySilently, false,                                   \
2378           "Do not print the verification progress")                         \
2379                                                                             \
2380   diagnostic(bool, VerifyDuringStartup, false,                              \
2381           "Verify memory system before executing any Java code "            \
2382           "during VM initialization")                                       \
2383                                                                             \
2384   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2385           "Verify system before exiting")                                   \
2386                                                                             \
2387   diagnostic(bool, VerifyBeforeGC, false,                                   \
2388           "Verify memory system before GC")                                 \
2389                                                                             \
2390   diagnostic(bool, VerifyAfterGC, false,                                    \
2391           "Verify memory system after GC")                                  \
2392                                                                             \
2393   diagnostic(bool, VerifyDuringGC, false,                                   \
2394           "Verify memory system during GC (between phases)")                \
2395                                                                             \
2396   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2397           "Enable parallel memory system verification")                     \
2398                                                                             \
2399   diagnostic(bool, DeferInitialCardMark, false,                             \
2400           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2401           "may arise from new_pre_store_barrier")                           \
2402                                                                             \
2403   product(bool, UseCondCardMark, false,                                     \
2404           "Check for already marked card before updating card table")       \
2405                                                                             \
2406   diagnostic(bool, VerifyRememberedSets, false,                             \
2407           "Verify GC remembered sets")                                      \
2408                                                                             \
2409   diagnostic(bool, VerifyObjectStartArray, true,                            \
2410           "Verify GC object start array if verify before/after")            \
2411                                                                             \
2412   product(bool, DisableExplicitGC, false,                                   \
2413           "Ignore calls to System.gc()")                                    \
2414                                                                             \
2415   notproduct(bool, CheckMemoryInitialization, false,                        \
2416           "Check memory initialization")                                    \
2417                                                                             \
2418   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2419           "Bind CMS Thread to CPU if possible")                             \
2420                                                                             \
2421   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2422           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2423                                                                             \
2424   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2425           "Bind GCTaskThreads to CPUs if possible")                         \
2426                                                                             \
2427   product(bool, UseGCTaskAffinity, false,                                   \
2428           "Use worker affinity when asking for GCTasks")                    \
2429                                                                             \
2430   product(uintx, ProcessDistributionStride, 4,                              \
2431           "Stride through processors when distributing processes")          \
2432                                                                             \
2433   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2434           "Number of times the coordinator GC thread will sleep while "     \
2435           "yielding before giving up and resuming GC")                      \
2436                                                                             \
2437   product(uintx, CMSYieldSleepCount, 0,                                     \
2438           "Number of times a GC thread (minus the coordinator) "            \
2439           "will sleep while yielding before giving up and resuming GC")     \
2440                                                                             \
2441   /* gc tracing */                                                          \
2442   manageable(bool, PrintGC, false,                                          \
2443           "Print message at garbage collection")                            \
2444                                                                             \
2445   manageable(bool, PrintGCDetails, false,                                   \
2446           "Print more details at garbage collection")                       \
2447                                                                             \
2448   manageable(bool, PrintGCDateStamps, false,                                \
2449           "Print date stamps at garbage collection")                        \
2450                                                                             \
2451   manageable(bool, PrintGCTimeStamps, false,                                \
2452           "Print timestamps at garbage collection")                         \
2453                                                                             \
2454   manageable(bool, PrintGCID, true,                                         \
2455           "Print an identifier for each garbage collection")                \
2456                                                                             \
2457   product(bool, PrintGCTaskTimeStamps, false,                               \
2458           "Print timestamps for individual gc worker thread tasks")         \
2459                                                                             \
2460   develop(intx, ConcGCYieldTimeout, 0,                                      \
2461           "If non-zero, assert that GC threads yield within this "          \
2462           "number of milliseconds")                                         \
2463                                                                             \
2464   product(bool, PrintReferenceGC, false,                                    \
2465           "Print times spent handling reference objects during GC "         \
2466           "(enabled only when PrintGCDetails)")                             \
2467                                                                             \
2468   develop(bool, TraceReferenceGC, false,                                    \
2469           "Trace handling of soft/weak/final/phantom references")           \
2470                                                                             \
2471   develop(bool, TraceFinalizerRegistration, false,                          \
2472           "Trace registration of final references")                         \
2473                                                                             \
2474   notproduct(bool, TraceScavenge, false,                                    \
2475           "Trace scavenge")                                                 \
2476                                                                             \
2477   product(bool, IgnoreEmptyClassPaths, false,                               \
2478           "Ignore empty path elements in -classpath")                       \
2479                                                                             \
2480   product(bool, TraceClassPaths, false,                                     \
2481           "Trace processing of class paths")                                \
2482                                                                             \
2483   product_rw(bool, TraceClassLoading, false,                                \
2484           "Trace all classes loaded")                                       \
2485                                                                             \
2486   product(bool, TraceClassLoadingPreorder, false,                           \
2487           "Trace all classes loaded in order referenced (not loaded)")      \
2488                                                                             \
2489   product_rw(bool, TraceClassUnloading, false,                              \
2490           "Trace unloading of classes")                                     \
2491                                                                             \
2492   product_rw(bool, TraceLoaderConstraints, false,                           \
2493           "Trace loader constraints")                                       \
2494                                                                             \
2495   develop(bool, TraceClassLoaderData, false,                                \
2496           "Trace class loader loader_data lifetime")                        \
2497                                                                             \
2498   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2499           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2500           "Initial size of the boot class loader data metaspace")           \
2501                                                                             \
2502   product(bool, TraceYoungGenTime, false,                                   \
2503           "Trace accumulated time for young collection")                    \
2504                                                                             \
2505   product(bool, TraceOldGenTime, false,                                     \
2506           "Trace accumulated time for old collection")                      \
2507                                                                             \
2508   product(bool, PrintTenuringDistribution, false,                           \
2509           "Print tenuring age information")                                 \
2510                                                                             \
2511   product_rw(bool, PrintHeapAtGC, false,                                    \
2512           "Print heap layout before and after each GC")                     \
2513                                                                             \
2514   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2515           "Print extended information about the layout of the heap "        \
2516           "when -XX:+PrintHeapAtGC is set")                                 \
2517                                                                             \
2518   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2519           "Print heap layout in response to SIGBREAK")                      \
2520                                                                             \
2521   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2522           "Print a class histogram before any major stop-world GC")         \
2523                                                                             \
2524   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2525           "Print a class histogram after any major stop-world GC")          \
2526                                                                             \
2527   manageable(bool, PrintClassHistogram, false,                              \
2528           "Print a histogram of class instances")                           \
2529                                                                             \
2530   develop(bool, TraceWorkGang, false,                                       \
2531           "Trace activities of work gangs")                                 \
2532                                                                             \
2533   product(bool, TraceParallelOldGCTasks, false,                             \
2534           "Trace multithreaded GC activity")                                \
2535                                                                             \
2536   develop(bool, TraceBlockOffsetTable, false,                               \
2537           "Print BlockOffsetTable maps")                                    \
2538                                                                             \
2539   develop(bool, TraceCardTableModRefBS, false,                              \
2540           "Print CardTableModRefBS maps")                                   \
2541                                                                             \
2542   develop(bool, TraceGCTaskManager, false,                                  \
2543           "Trace actions of the GC task manager")                           \
2544                                                                             \
2545   develop(bool, TraceGCTaskQueue, false,                                    \
2546           "Trace actions of the GC task queues")                            \
2547                                                                             \
2548   diagnostic(bool, TraceGCTaskThread, false,                                \
2549           "Trace actions of the GC task threads")                           \
2550                                                                             \
2551   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2552           "Print the time taken by each phase in ParallelOldGC "            \
2553           "(PrintGCDetails must also be enabled)")                          \
2554                                                                             \
2555   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2556           "Trace marking phase in ParallelOldGC")                           \
2557                                                                             \
2558   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2559           "Trace summary phase in ParallelOldGC")                           \
2560                                                                             \
2561   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2562           "Trace compaction phase in ParallelOldGC")                        \
2563                                                                             \
2564   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2565           "Trace dense prefix computation for ParallelOldGC")               \
2566                                                                             \
2567   develop(bool, IgnoreLibthreadGPFault, false,                              \
2568           "Suppress workaround for libthread GP fault")                     \
2569                                                                             \
2570   product(bool, PrintJNIGCStalls, false,                                    \
2571           "Print diagnostic message when GC is stalled "                    \
2572           "by JNI critical section")                                        \
2573                                                                             \
2574   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2575           "The percentage of the used heap that the instances of a class "  \
2576           "must occupy for the class to generate a trace event")            \
2577                                                                             \
2578   /* GC log rotation setting */                                             \
2579                                                                             \
2580   product(bool, UseGCLogFileRotation, false,                                \
2581           "Rotate gclog files (for long running applications). It requires "\
2582           "-Xloggc:<filename>")                                             \
2583                                                                             \
2584   product(uintx, NumberOfGCLogFiles, 0,                                     \
2585           "Number of gclog files in rotation "                              \
2586           "(default: 0, no rotation)")                                      \
2587                                                                             \
2588   product(size_t, GCLogFileSize, 8*K,                                       \
2589           "GC log file size, requires UseGCLogFileRotation. "               \
2590           "Set to 0 to only trigger rotation via jcmd")                     \
2591                                                                             \
2592   /* JVMTI heap profiling */                                                \
2593                                                                             \
2594   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2595           "Trace JVMTI object tagging calls")                               \
2596                                                                             \
2597   diagnostic(bool, VerifyBeforeIteration, false,                            \
2598           "Verify memory system before JVMTI iteration")                    \
2599                                                                             \
2600   /* compiler interface */                                                  \
2601                                                                             \
2602   develop(bool, CIPrintCompilerName, false,                                 \
2603           "when CIPrint is active, print the name of the active compiler")  \
2604                                                                             \
2605   diagnostic(bool, CIPrintCompileQueue, false,                              \
2606           "display the contents of the compile queue whenever a "           \
2607           "compilation is enqueued")                                        \
2608                                                                             \
2609   develop(bool, CIPrintRequests, false,                                     \
2610           "display every request for compilation")                          \
2611                                                                             \
2612   product(bool, CITime, false,                                              \
2613           "collect timing information for compilation")                     \
2614                                                                             \
2615   develop(bool, CITimeVerbose, false,                                       \
2616           "be more verbose in compilation timings")                         \
2617                                                                             \
2618   develop(bool, CITimeEach, false,                                          \
2619           "display timing information after each successful compilation")   \
2620                                                                             \
2621   develop(bool, CICountOSR, false,                                          \
2622           "use a separate counter when assigning ids to osr compilations")  \
2623                                                                             \
2624   develop(bool, CICompileNatives, true,                                     \
2625           "compile native methods if supported by the compiler")            \
2626                                                                             \
2627   develop_pd(bool, CICompileOSR,                                            \
2628           "compile on stack replacement methods if supported by the "       \
2629           "compiler")                                                       \
2630                                                                             \
2631   develop(bool, CIPrintMethodCodes, false,                                  \
2632           "print method bytecodes of the compiled code")                    \
2633                                                                             \
2634   develop(bool, CIPrintTypeFlow, false,                                     \
2635           "print the results of ciTypeFlow analysis")                       \
2636                                                                             \
2637   develop(bool, CITraceTypeFlow, false,                                     \
2638           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2639                                                                             \
2640   develop(intx, OSROnlyBCI, -1,                                             \
2641           "OSR only at this bci.  Negative values mean exclude that bci")   \
2642                                                                             \
2643   /* compiler */                                                            \
2644                                                                             \
2645   /* notice: the max range value here is max_jint, not max_intx  */         \
2646   /* because of overflow issue                                   */         \
2647   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2648           "Number of compiler threads to run")                              \
2649           range(0, max_jint)                                                \
2650           constraint(CICompilerCountConstraintFunc, AtParse)                \
2651                                                                             \
2652   product(intx, CompilationPolicyChoice, 0,                                 \
2653           "which compilation policy (0-3)")                                 \
2654           range(0, 3)                                                       \
2655                                                                             \
2656   develop(bool, UseStackBanging, true,                                      \
2657           "use stack banging for stack overflow checks (required for "      \
2658           "proper StackOverflow handling; disable only to measure cost "    \
2659           "of stackbanging)")                                               \
2660                                                                             \
2661   develop(bool, UseStrictFP, true,                                          \
2662           "use strict fp if modifier strictfp is set")                      \
2663                                                                             \
2664   develop(bool, GenerateSynchronizationCode, true,                          \
2665           "generate locking/unlocking code for synchronized methods and "   \
2666           "monitors")                                                       \
2667                                                                             \
2668   develop(bool, GenerateCompilerNullChecks, true,                           \
2669           "Generate explicit null checks for loads/stores/calls")           \
2670                                                                             \
2671   develop(bool, GenerateRangeChecks, true,                                  \
2672           "Generate range checks for array accesses")                       \
2673                                                                             \
2674   develop_pd(bool, ImplicitNullChecks,                                      \
2675           "Generate code for implicit null checks")                         \
2676                                                                             \
2677   product_pd(bool, TrapBasedNullChecks,                                     \
2678           "Generate code for null checks that uses a cmp and trap "         \
2679           "instruction raising SIGTRAP.  This is only used if an access to" \
2680           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2681           "ImplicitNullChecks don't work (PPC64).")                         \
2682                                                                             \
2683   product(bool, PrintSafepointStatistics, false,                            \
2684           "Print statistics about safepoint synchronization")               \
2685                                                                             \
2686   product(intx, PrintSafepointStatisticsCount, 300,                         \
2687           "Total number of safepoint statistics collected "                 \
2688           "before printing them out")                                       \
2689                                                                             \
2690   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2691           "Print safepoint statistics only when safepoint takes "           \
2692           "more than PrintSafepointSatisticsTimeout in millis")             \
2693                                                                             \
2694   product(bool, TraceSafepointCleanupTime, false,                           \
2695           "Print the break down of clean up tasks performed during "        \
2696           "safepoint")                                                      \
2697                                                                             \
2698   product(bool, Inline, true,                                               \
2699           "Enable inlining")                                                \
2700                                                                             \
2701   product(bool, ClipInlining, true,                                         \
2702           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2703                                                                             \
2704   develop(bool, UseCHA, true,                                               \
2705           "Enable CHA")                                                     \
2706                                                                             \
2707   product(bool, UseTypeProfile, true,                                       \
2708           "Check interpreter profile for historically monomorphic calls")   \
2709                                                                             \
2710   diagnostic(bool, PrintInlining, false,                                    \
2711           "Print inlining optimizations")                                   \
2712                                                                             \
2713   product(bool, UsePopCountInstruction, false,                              \
2714           "Use population count instruction")                               \
2715                                                                             \
2716   develop(bool, EagerInitialization, false,                                 \
2717           "Eagerly initialize classes if possible")                         \
2718                                                                             \
2719   diagnostic(bool, LogTouchedMethods, false,                                \
2720           "Log methods which have been ever touched in runtime")            \
2721                                                                             \
2722   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2723           "Print all methods that have been ever touched in runtime")       \
2724                                                                             \
2725   develop(bool, TraceMethodReplacement, false,                              \
2726           "Print when methods are replaced do to recompilation")            \
2727                                                                             \
2728   develop(bool, PrintMethodFlushing, false,                                 \
2729           "Print the nmethods being flushed")                               \
2730                                                                             \
2731   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2732           "print statistics about method flushing")                         \
2733                                                                             \
2734   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2735           "Number of compiled code invocations after which "                \
2736           "the method is considered as hot by the flusher")                 \
2737                                                                             \
2738   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2739           "Minimum number of sweeper passes before an nmethod "             \
2740           "can be flushed")                                                 \
2741                                                                             \
2742   product(bool, UseCodeAging, true,                                         \
2743           "Insert counter to detect warm methods")                          \
2744                                                                             \
2745   diagnostic(bool, StressCodeAging, false,                                  \
2746           "Start with counters compiled in")                                \
2747                                                                             \
2748   develop(bool, UseRelocIndex, false,                                       \
2749           "Use an index to speed random access to relocations")             \
2750                                                                             \
2751   develop(bool, StressCodeBuffers, false,                                   \
2752           "Exercise code buffer expansion and other rare state changes")    \
2753                                                                             \
2754   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2755           "Generate extra debugging information for non-safepoints in "     \
2756           "nmethods")                                                       \
2757                                                                             \
2758   product(bool, PrintVMOptions, false,                                      \
2759           "Print flags that appeared on the command line")                  \
2760                                                                             \
2761   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2762           "Ignore unrecognized VM options")                                 \
2763                                                                             \
2764   product(bool, PrintCommandLineFlags, false,                               \
2765           "Print flags specified on command line or set by ergonomics")     \
2766                                                                             \
2767   product(bool, PrintFlagsInitial, false,                                   \
2768           "Print all VM flags before argument processing and exit VM")      \
2769                                                                             \
2770   product(bool, PrintFlagsFinal, false,                                     \
2771           "Print all VM flags after argument and ergonomic processing")     \
2772                                                                             \
2773   notproduct(bool, PrintFlagsWithComments, false,                           \
2774           "Print all VM flags with default values and descriptions and "    \
2775           "exit")                                                           \
2776                                                                             \
2777   product(bool, PrintFlagsRanges, false,                                    \
2778           "Print VM flags and their ranges and exit VM")                    \
2779                                                                             \
2780   diagnostic(bool, SerializeVMOutput, true,                                 \
2781           "Use a mutex to serialize output to tty and LogFile")             \
2782                                                                             \
2783   diagnostic(bool, DisplayVMOutput, true,                                   \
2784           "Display all VM output on the tty, independently of LogVMOutput") \
2785                                                                             \
2786   diagnostic(bool, LogVMOutput, false,                                      \
2787           "Save VM output to LogFile")                                      \
2788                                                                             \
2789   diagnostic(ccstr, LogFile, NULL,                                          \
2790           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2791           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2792                                                                             \
2793   product(ccstr, ErrorFile, NULL,                                           \
2794           "If an error occurs, save the error data to this file "           \
2795           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2796                                                                             \
2797   product(bool, DisplayVMOutputToStderr, false,                             \
2798           "If DisplayVMOutput is true, display all VM output to stderr")    \
2799                                                                             \
2800   product(bool, DisplayVMOutputToStdout, false,                             \
2801           "If DisplayVMOutput is true, display all VM output to stdout")    \
2802                                                                             \
2803   product(bool, UseHeavyMonitors, false,                                    \
2804           "use heavyweight instead of lightweight Java monitors")           \
2805                                                                             \
2806   product(bool, PrintStringTableStatistics, false,                          \
2807           "print statistics about the StringTable and SymbolTable")         \
2808                                                                             \
2809   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2810           "verify StringTable contents at exit")                            \
2811                                                                             \
2812   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2813           "print histogram of the symbol table")                            \
2814                                                                             \
2815   notproduct(bool, ExitVMOnVerifyError, false,                              \
2816           "standard exit from VM if bytecode verify error "                 \
2817           "(only in debug mode)")                                           \
2818                                                                             \
2819   notproduct(ccstr, AbortVMOnException, NULL,                               \
2820           "Call fatal if this exception is thrown.  Example: "              \
2821           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2822                                                                             \
2823   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2824           "Call fatal if the exception pointed by AbortVMOnException "      \
2825           "has this message")                                               \
2826                                                                             \
2827   develop(bool, DebugVtables, false,                                        \
2828           "add debugging code to vtable dispatch")                          \
2829                                                                             \
2830   develop(bool, PrintVtables, false,                                        \
2831           "print vtables when printing klass")                              \
2832                                                                             \
2833   notproduct(bool, PrintVtableStats, false,                                 \
2834           "print vtables stats at end of run")                              \
2835                                                                             \
2836   develop(bool, TraceCreateZombies, false,                                  \
2837           "trace creation of zombie nmethods")                              \
2838                                                                             \
2839   notproduct(bool, IgnoreLockingAssertions, false,                          \
2840           "disable locking assertions (for speed)")                         \
2841                                                                             \
2842   product(bool, RangeCheckElimination, true,                                \
2843           "Eliminate range checks")                                         \
2844                                                                             \
2845   develop_pd(bool, UncommonNullCast,                                        \
2846           "track occurrences of null in casts; adjust compiler tactics")    \
2847                                                                             \
2848   develop(bool, TypeProfileCasts,  true,                                    \
2849           "treat casts like calls for purposes of type profiling")          \
2850                                                                             \
2851   develop(bool, DelayCompilationDuringStartup, true,                        \
2852           "Delay invoking the compiler until main application class is "    \
2853           "loaded")                                                         \
2854                                                                             \
2855   develop(bool, CompileTheWorld, false,                                     \
2856           "Compile all methods in all classes in bootstrap class path "     \
2857           "(stress test)")                                                  \
2858                                                                             \
2859   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2860           "Preload all classes used by a class before start loading")       \
2861                                                                             \
2862   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2863           "Force a safepoint every n compiles so sweeper can keep up")      \
2864                                                                             \
2865   develop(bool, FillDelaySlots, true,                                       \
2866           "Fill delay slots (on SPARC only)")                               \
2867                                                                             \
2868   develop(bool, TimeLivenessAnalysis, false,                                \
2869           "Time computation of bytecode liveness analysis")                 \
2870                                                                             \
2871   develop(bool, TraceLivenessGen, false,                                    \
2872           "Trace the generation of liveness analysis information")          \
2873                                                                             \
2874   notproduct(bool, TraceLivenessQuery, false,                               \
2875           "Trace queries of liveness analysis information")                 \
2876                                                                             \
2877   notproduct(bool, CollectIndexSetStatistics, false,                        \
2878           "Collect information about IndexSets")                            \
2879                                                                             \
2880   develop(bool, UseLoopSafepoints, true,                                    \
2881           "Generate Safepoint nodes in every loop")                         \
2882                                                                             \
2883   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2884           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2885           "Inline allocations larger than this in doublewords must go slow")\
2886                                                                             \
2887   product(bool, AggressiveOpts, false,                                      \
2888           "Enable aggressive optimizations - see arguments.cpp")            \
2889                                                                             \
2890   product_pd(uintx, TypeProfileLevel,                                       \
2891           "=XYZ, with Z: Type profiling of arguments at call; "             \
2892                      "Y: Type profiling of return value at call; "          \
2893                      "X: Type profiling of parameters to methods; "         \
2894           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2895                                                                             \
2896   product(intx, TypeProfileArgsLimit,     2,                                \
2897           "max number of call arguments to consider for type profiling")    \
2898                                                                             \
2899   product(intx, TypeProfileParmsLimit,    2,                                \
2900           "max number of incoming parameters to consider for type profiling"\
2901           ", -1 for all")                                                   \
2902                                                                             \
2903   /* statistics */                                                          \
2904   develop(bool, CountCompiledCalls, false,                                  \
2905           "Count method invocations")                                       \
2906                                                                             \
2907   notproduct(bool, CountRuntimeCalls, false,                                \
2908           "Count VM runtime calls")                                         \
2909                                                                             \
2910   develop(bool, CountJNICalls, false,                                       \
2911           "Count jni method invocations")                                   \
2912                                                                             \
2913   notproduct(bool, CountJVMCalls, false,                                    \
2914           "Count jvm method invocations")                                   \
2915                                                                             \
2916   notproduct(bool, CountRemovableExceptions, false,                         \
2917           "Count exceptions that could be replaced by branches due to "     \
2918           "inlining")                                                       \
2919                                                                             \
2920   notproduct(bool, ICMissHistogram, false,                                  \
2921           "Produce histogram of IC misses")                                 \
2922                                                                             \
2923   notproduct(bool, PrintClassStatistics, false,                             \
2924           "Print class statistics at end of run")                           \
2925                                                                             \
2926   notproduct(bool, PrintMethodStatistics, false,                            \
2927           "Print method statistics at end of run")                          \
2928                                                                             \
2929   /* interpreter */                                                         \
2930   develop(bool, ClearInterpreterLocals, false,                              \
2931           "Always clear local variables of interpreter activations upon "   \
2932           "entry")                                                          \
2933                                                                             \
2934   product_pd(bool, RewriteBytecodes,                                        \
2935           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2936                                                                             \
2937   product_pd(bool, RewriteFrequentPairs,                                    \
2938           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2939                                                                             \
2940   diagnostic(bool, PrintInterpreter, false,                                 \
2941           "Print the generated interpreter code")                           \
2942                                                                             \
2943   product(bool, UseInterpreter, true,                                       \
2944           "Use interpreter for non-compiled methods")                       \
2945                                                                             \
2946   develop(bool, UseFastSignatureHandlers, true,                             \
2947           "Use fast signature handlers for native calls")                   \
2948                                                                             \
2949   product(bool, UseLoopCounter, true,                                       \
2950           "Increment invocation counter on backward branch")                \
2951                                                                             \
2952   product_pd(bool, UseOnStackReplacement,                                   \
2953           "Use on stack replacement, calls runtime if invoc. counter "      \
2954           "overflows in loop")                                              \
2955                                                                             \
2956   notproduct(bool, TraceOnStackReplacement, false,                          \
2957           "Trace on stack replacement")                                     \
2958                                                                             \
2959   product_pd(bool, PreferInterpreterNativeStubs,                            \
2960           "Use always interpreter stubs for native methods invoked via "    \
2961           "interpreter")                                                    \
2962                                                                             \
2963   develop(bool, CountBytecodes, false,                                      \
2964           "Count number of bytecodes executed")                             \
2965                                                                             \
2966   develop(bool, PrintBytecodeHistogram, false,                              \
2967           "Print histogram of the executed bytecodes")                      \
2968                                                                             \
2969   develop(bool, PrintBytecodePairHistogram, false,                          \
2970           "Print histogram of the executed bytecode pairs")                 \
2971                                                                             \
2972   diagnostic(bool, PrintSignatureHandlers, false,                           \
2973           "Print code generated for native method signature handlers")      \
2974                                                                             \
2975   develop(bool, VerifyOops, false,                                          \
2976           "Do plausibility checks for oops")                                \
2977                                                                             \
2978   develop(bool, CheckUnhandledOops, false,                                  \
2979           "Check for unhandled oops in VM code")                            \
2980                                                                             \
2981   develop(bool, VerifyJNIFields, trueInDebug,                               \
2982           "Verify jfieldIDs for instance fields")                           \
2983                                                                             \
2984   notproduct(bool, VerifyJNIEnvThread, false,                               \
2985           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2986           "from JNI")                                                       \
2987                                                                             \
2988   develop(bool, VerifyFPU, false,                                           \
2989           "Verify FPU state (check for NaN's, etc.)")                       \
2990                                                                             \
2991   develop(bool, VerifyThread, false,                                        \
2992           "Watch the thread register for corruption (SPARC only)")          \
2993                                                                             \
2994   develop(bool, VerifyActivationFrameSize, false,                           \
2995           "Verify that activation frame didn't become smaller than its "    \
2996           "minimal size")                                                   \
2997                                                                             \
2998   develop(bool, TraceFrequencyInlining, false,                              \
2999           "Trace frequency based inlining")                                 \
3000                                                                             \
3001   develop_pd(bool, InlineIntrinsics,                                        \
3002           "Inline intrinsics that can be statically resolved")              \
3003                                                                             \
3004   product_pd(bool, ProfileInterpreter,                                      \
3005           "Profile at the bytecode level during interpretation")            \
3006                                                                             \
3007   develop(bool, TraceProfileInterpreter, false,                             \
3008           "Trace profiling at the bytecode level during interpretation. "   \
3009           "This outputs the profiling information collected to improve "    \
3010           "jit compilation.")                                               \
3011                                                                             \
3012   develop_pd(bool, ProfileTraps,                                            \
3013           "Profile deoptimization traps at the bytecode level")             \
3014                                                                             \
3015   product(intx, ProfileMaturityPercentage, 20,                              \
3016           "number of method invocations/branches (expressed as % of "       \
3017           "CompileThreshold) before using the method's profile")            \
3018           range(0, 100)                                                     \
3019                                                                             \
3020   diagnostic(bool, PrintMethodData, false,                                  \
3021           "Print the results of +ProfileInterpreter at end of run")         \
3022                                                                             \
3023   develop(bool, VerifyDataPointer, trueInDebug,                             \
3024           "Verify the method data pointer during interpreter profiling")    \
3025                                                                             \
3026   develop(bool, VerifyCompiledCode, false,                                  \
3027           "Include miscellaneous runtime verifications in nmethod code; "   \
3028           "default off because it disturbs nmethod size heuristics")        \
3029                                                                             \
3030   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
3031           "Manually make GC thread crash then dump java stack trace;  "     \
3032           "Test only")                                                      \
3033                                                                             \
3034   /* compilation */                                                         \
3035   product(bool, UseCompiler, true,                                          \
3036           "Use Just-In-Time compilation")                                   \
3037                                                                             \
3038   develop(bool, TraceCompilationPolicy, false,                              \
3039           "Trace compilation policy")                                       \
3040                                                                             \
3041   develop(bool, TimeCompilationPolicy, false,                               \
3042           "Time the compilation policy")                                    \
3043                                                                             \
3044   product(bool, UseCounterDecay, true,                                      \
3045           "Adjust recompilation counters")                                  \
3046                                                                             \
3047   develop(intx, CounterHalfLifeTime,    30,                                 \
3048           "Half-life time of invocation counters (in seconds)")             \
3049                                                                             \
3050   develop(intx, CounterDecayMinIntervalLength,   500,                       \
3051           "The minimum interval (in milliseconds) between invocation of "   \
3052           "CounterDecay")                                                   \
3053                                                                             \
3054   product(bool, AlwaysCompileLoopMethods, false,                            \
3055           "When using recompilation, never interpret methods "              \
3056           "containing loops")                                               \
3057                                                                             \
3058   product(bool, DontCompileHugeMethods, true,                               \
3059           "Do not compile methods > HugeMethodLimit")                       \
3060                                                                             \
3061   /* Bytecode escape analysis estimation. */                                \
3062   product(bool, EstimateArgEscape, true,                                    \
3063           "Analyze bytecodes to estimate escape state of arguments")        \
3064                                                                             \
3065   product(intx, BCEATraceLevel, 0,                                          \
3066           "How much tracing to do of bytecode escape analysis estimates")   \
3067                                                                             \
3068   product(intx, MaxBCEAEstimateLevel, 5,                                    \
3069           "Maximum number of nested calls that are analyzed by BC EA")      \
3070                                                                             \
3071   product(intx, MaxBCEAEstimateSize, 150,                                   \
3072           "Maximum bytecode size of a method to be analyzed by BC EA")      \
3073                                                                             \
3074   product(intx,  AllocatePrefetchStyle, 1,                                  \
3075           "0 = no prefetch, "                                               \
3076           "1 = prefetch instructions for each allocation, "                 \
3077           "2 = use TLAB watermark to gate allocation prefetch, "            \
3078           "3 = use BIS instruction on Sparc for allocation prefetch")       \
3079           range(0, 3)                                                       \
3080                                                                             \
3081   product(intx,  AllocatePrefetchDistance, -1,                              \
3082           "Distance to prefetch ahead of allocation pointer")               \
3083                                                                             \
3084   product(intx,  AllocatePrefetchLines, 3,                                  \
3085           "Number of lines to prefetch ahead of array allocation pointer")  \
3086                                                                             \
3087   product(intx,  AllocateInstancePrefetchLines, 1,                          \
3088           "Number of lines to prefetch ahead of instance allocation "       \
3089           "pointer")                                                        \
3090                                                                             \
3091   product(intx,  AllocatePrefetchStepSize, 16,                              \
3092           "Step size in bytes of sequential prefetch instructions")         \
3093                                                                             \
3094   product(intx,  AllocatePrefetchInstr, 0,                                  \
3095           "Prefetch instruction to prefetch ahead of allocation pointer")   \
3096                                                                             \
3097   /* deoptimization */                                                      \
3098   develop(bool, TraceDeoptimization, false,                                 \
3099           "Trace deoptimization")                                           \
3100                                                                             \
3101   develop(bool, DebugDeoptimization, false,                                 \
3102           "Tracing various information while debugging deoptimization")     \
3103                                                                             \
3104   product(intx, SelfDestructTimer, 0,                                       \
3105           "Will cause VM to terminate after a given time (in minutes) "     \
3106           "(0 means off)")                                                  \
3107                                                                             \
3108   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3109           "The maximum number of lines in the stack trace for Java "        \
3110           "exceptions (0 means all)")                                       \
3111                                                                             \
3112   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3113           "Guarantee a safepoint (at least) every so many milliseconds "    \
3114           "(0 means none)"))                                                \
3115                                                                             \
3116   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3117           "Guarantee a safepoint (at least) every so many milliseconds "    \
3118           "(0 means none)"))                                                \
3119                                                                             \
3120   product(intx, SafepointTimeoutDelay, 10000,                               \
3121           "Delay in milliseconds for option SafepointTimeout")              \
3122                                                                             \
3123   product(intx, NmethodSweepActivity, 10,                                   \
3124           "Removes cold nmethods from code cache if > 0. Higher values "    \
3125           "result in more aggressive sweeping")                             \
3126           range(0, 2000)                                                    \
3127                                                                             \
3128   notproduct(bool, LogSweeper, false,                                       \
3129           "Keep a ring buffer of sweeper activity")                         \
3130                                                                             \
3131   notproduct(intx, SweeperLogEntries, 1024,                                 \
3132           "Number of records in the ring buffer of sweeper activity")       \
3133                                                                             \
3134   notproduct(intx, MemProfilingInterval, 500,                               \
3135           "Time between each invocation of the MemProfiler")                \
3136                                                                             \
3137   develop(intx, MallocCatchPtr, -1,                                         \
3138           "Hit breakpoint when mallocing/freeing this pointer")             \
3139                                                                             \
3140   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3141           "List of assertions (file:line) to muzzle")                       \
3142                                                                             \
3143   notproduct(size_t, HandleAllocationLimit, 1024,                           \
3144           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3145           "is used")                                                        \
3146                                                                             \
3147   develop(size_t, TotalHandleAllocationLimit, 1024,                         \
3148           "Threshold for total handle allocation when "                     \
3149           "+TraceHandleAllocation is used")                                 \
3150                                                                             \
3151   develop(intx, StackPrintLimit, 100,                                       \
3152           "number of stack frames to print in VM-level stack dump")         \
3153                                                                             \
3154   notproduct(intx, MaxElementPrintSize, 256,                                \
3155           "maximum number of elements to print")                            \
3156                                                                             \
3157   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3158           "maximum number of subklasses to print when printing klass")      \
3159                                                                             \
3160   product(intx, MaxInlineLevel, 9,                                          \
3161           "maximum number of nested calls that are inlined")                \
3162                                                                             \
3163   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3164           "maximum number of nested recursive calls that are inlined")      \
3165                                                                             \
3166   develop(intx, MaxForceInlineLevel, 100,                                   \
3167           "maximum number of nested calls that are forced for inlining "    \
3168           "(using CompilerOracle or marked w/ @ForceInline)")               \
3169                                                                             \
3170   product_pd(intx, InlineSmallCode,                                         \
3171           "Only inline already compiled methods if their code size is "     \
3172           "less than this")                                                 \
3173                                                                             \
3174   product(intx, MaxInlineSize, 35,                                          \
3175           "The maximum bytecode size of a method to be inlined")            \
3176                                                                             \
3177   product_pd(intx, FreqInlineSize,                                          \
3178           "The maximum bytecode size of a frequent method to be inlined")   \
3179                                                                             \
3180   product(intx, MaxTrivialSize, 6,                                          \
3181           "The maximum bytecode size of a trivial method to be inlined")    \
3182                                                                             \
3183   product(intx, MinInliningThreshold, 250,                                  \
3184           "The minimum invocation count a method needs to have to be "      \
3185           "inlined")                                                        \
3186                                                                             \
3187   develop(intx, MethodHistogramCutoff, 100,                                 \
3188           "The cutoff value for method invocation histogram (+CountCalls)") \
3189                                                                             \
3190   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3191           "Number of interpreted methods to show in profile")               \
3192                                                                             \
3193   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3194           "Number of compiled methods to show in profile")                  \
3195                                                                             \
3196   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3197           "Number of stub methods to show in profile")                      \
3198                                                                             \
3199   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3200           "Number of runtime stub nodes to show in profile")                \
3201                                                                             \
3202   product(intx, ProfileIntervalsTicks, 100,                                 \
3203           "Number of ticks between printing of interval profile "           \
3204           "(+ProfileIntervals)")                                            \
3205                                                                             \
3206   notproduct(intx, ScavengeALotInterval,     1,                             \
3207           "Interval between which scavenge will occur with +ScavengeALot")  \
3208                                                                             \
3209   notproduct(intx, FullGCALotInterval,     1,                               \
3210           "Interval between which full gc will occur with +FullGCALot")     \
3211                                                                             \
3212   notproduct(intx, FullGCALotStart,     0,                                  \
3213           "For which invocation to start FullGCAlot")                       \
3214                                                                             \
3215   notproduct(intx, FullGCALotDummies,  32*K,                                \
3216           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3217           "to move")                                                        \
3218                                                                             \
3219   develop(intx, DontYieldALotInterval,    10,                               \
3220           "Interval between which yields will be dropped (milliseconds)")   \
3221                                                                             \
3222   develop(intx, MinSleepInterval,     1,                                    \
3223           "Minimum sleep() interval (milliseconds) when "                   \
3224           "ConvertSleepToYield is off (used for Solaris)")                  \
3225                                                                             \
3226   develop(intx, ProfilerPCTickThreshold,    15,                             \
3227           "Number of ticks in a PC buckets to be a hotspot")                \
3228                                                                             \
3229   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3230           "Number of exits until DeoptimizeALot kicks in")                  \
3231                                                                             \
3232   notproduct(intx, ZombieALotInterval,     5,                               \
3233           "Number of exits until ZombieALot kicks in")                      \
3234                                                                             \
3235   diagnostic(intx, MallocVerifyInterval,     0,                             \
3236           "If non-zero, verify C heap after every N calls to "              \
3237           "malloc/realloc/free")                                            \
3238                                                                             \
3239   diagnostic(intx, MallocVerifyStart,     0,                                \
3240           "If non-zero, start verifying C heap after Nth call to "          \
3241           "malloc/realloc/free")                                            \
3242                                                                             \
3243   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3244           "If non-zero, maximum number of words that malloc/realloc can "   \
3245           "allocate (for testing only)")                                    \
3246                                                                             \
3247   product(intx, TypeProfileWidth,     2,                                    \
3248           "Number of receiver types to record in call/cast profile")        \
3249                                                                             \
3250   develop(intx, BciProfileWidth,      2,                                    \
3251           "Number of return bci's to record in ret profile")                \
3252                                                                             \
3253   product(intx, PerMethodRecompilationCutoff, 400,                          \
3254           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3255           range(-1, max_intx)                                               \
3256                                                                             \
3257   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3258           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3259           range(-1, max_intx)                                               \
3260                                                                             \
3261   product(intx, PerMethodTrapLimit,  100,                                   \
3262           "Limit on traps (of one kind) in a method (includes inlines)")    \
3263                                                                             \
3264   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3265           "Limit on speculative traps (of one kind) in a method "           \
3266           "(includes inlines)")                                             \
3267                                                                             \
3268   product(intx, PerBytecodeTrapLimit,  4,                                   \
3269           "Limit on traps (of one kind) at a particular BCI")               \
3270                                                                             \
3271   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3272           "Extra method data trap entries for speculation")                 \
3273                                                                             \
3274   develop(intx, InlineFrequencyRatio,    20,                                \
3275           "Ratio of call site execution to caller method invocation")       \
3276                                                                             \
3277   develop_pd(intx, InlineFrequencyCount,                                    \
3278           "Count of call site execution necessary to trigger frequent "     \
3279           "inlining")                                                       \
3280                                                                             \
3281   develop(intx, InlineThrowCount,    50,                                    \
3282           "Force inlining of interpreted methods that throw this often")    \
3283                                                                             \
3284   develop(intx, InlineThrowMaxSize,   200,                                  \
3285           "Force inlining of throwing methods smaller than this")           \
3286                                                                             \
3287   develop(intx, ProfilerNodeSize,  1024,                                    \
3288           "Size in K to allocate for the Profile Nodes of each thread")     \
3289                                                                             \
3290   /* gc parameters */                                                       \
3291   product(size_t, InitialHeapSize, 0,                                       \
3292           "Initial heap size (in bytes); zero means use ergonomics")        \
3293                                                                             \
3294   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3295           "Maximum heap size (in bytes)")                                   \
3296                                                                             \
3297   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3298           "Initial tenured generation size (in bytes)")                     \
3299                                                                             \
3300   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3301           "Initial new generation size (in bytes)")                         \
3302                                                                             \
3303   product(size_t, MaxNewSize, max_uintx,                                    \
3304           "Maximum new generation size (in bytes), max_uintx means set "    \
3305           "ergonomically")                                                  \
3306                                                                             \
3307   product(size_t, PretenureSizeThreshold, 0,                                \
3308           "Maximum size in bytes of objects allocated in DefNew "           \
3309           "generation; zero means no maximum")                              \
3310                                                                             \
3311   product(size_t, TLABSize, 0,                                              \
3312           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3313                                                                             \
3314   product(size_t, MinTLABSize, 2*K,                                         \
3315           "Minimum allowed TLAB size (in bytes)")                           \
3316           range(1, max_uintx)                                               \
3317                                                                             \
3318   product(uintx, TLABAllocationWeight, 35,                                  \
3319           "Allocation averaging weight")                                    \
3320           range(0, 100)                                                     \
3321                                                                             \
3322   /* Limit the lower bound of this flag to 1 as it is used  */              \
3323   /* in a division expression.                              */              \
3324   product(uintx, TLABWasteTargetPercent, 1,                                 \
3325           "Percentage of Eden that can be wasted")                          \
3326           range(1, 100)                                                     \
3327                                                                             \
3328   product(uintx, TLABRefillWasteFraction,    64,                            \
3329           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3330           range(1, max_uintx)                                               \
3331                                                                             \
3332   product(uintx, TLABWasteIncrement,    4,                                  \
3333           "Increment allowed waste at slow allocation")                     \
3334                                                                             \
3335   product(uintx, SurvivorRatio, 8,                                          \
3336           "Ratio of eden/survivor space size")                              \
3337                                                                             \
3338   product(uintx, NewRatio, 2,                                               \
3339           "Ratio of old/new generation sizes")                              \
3340                                                                             \
3341   product_pd(size_t, NewSizeThreadIncrease,                                 \
3342           "Additional size added to desired new generation size per "       \
3343           "non-daemon thread (in bytes)")                                   \
3344                                                                             \
3345   product_pd(size_t, MetaspaceSize,                                         \
3346           "Initial size of Metaspaces (in bytes)")                          \
3347                                                                             \
3348   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3349           "Maximum size of Metaspaces (in bytes)")                          \
3350                                                                             \
3351   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3352           "Maximum size of class area in Metaspace when compressed "        \
3353           "class pointers are used")                                        \
3354           range(1*M, 3*G)                                                   \
3355                                                                             \
3356   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3357           "The minimum percentage of heap free after GC to avoid expansion."\
3358           " For most GCs this applies to the old generation. In G1 and"     \
3359           " ParallelGC it applies to the whole heap.")                      \
3360           range(0, 100)                                                     \
3361           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3362                                                                             \
3363   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3364           "The maximum percentage of heap free after GC to avoid shrinking."\
3365           " For most GCs this applies to the old generation. In G1 and"     \
3366           " ParallelGC it applies to the whole heap.")                      \
3367           range(0, 100)                                                     \
3368           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3369                                                                             \
3370   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3371           "Number of milliseconds per MB of free space in the heap")        \
3372                                                                             \
3373   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3374           "The minimum change in heap space due to GC (in bytes)")          \
3375                                                                             \
3376   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3377           "The minimum expansion of Metaspace (in bytes)")                  \
3378                                                                             \
3379   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3380           "The maximum percentage of Metaspace free after GC to avoid "     \
3381           "shrinking")                                                      \
3382           range(0, 100)                                                     \
3383           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3384                                                                             \
3385   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3386           "The minimum percentage of Metaspace free after GC to avoid "     \
3387           "expansion")                                                      \
3388           range(0, 99)                                                      \
3389           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3390                                                                             \
3391   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3392           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3393                                                                             \
3394   product(uintx, QueuedAllocationWarningCount, 0,                           \
3395           "Number of times an allocation that queues behind a GC "          \
3396           "will retry before printing a warning")                           \
3397                                                                             \
3398   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3399           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3400                                                                             \
3401   diagnostic(intx, VerifyGCLevel,     0,                                    \
3402           "Generation level at which to start +VerifyBefore/AfterGC")       \
3403                                                                             \
3404   product(uintx, MaxTenuringThreshold,    15,                               \
3405           "Maximum value for tenuring threshold")                           \
3406           range(0, markOopDesc::max_age + 1)                                \
3407           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3408                                                                             \
3409   product(uintx, InitialTenuringThreshold,    7,                            \
3410           "Initial value for tenuring threshold")                           \
3411           range(0, markOopDesc::max_age + 1)                                \
3412           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3413                                                                             \
3414   product(uintx, TargetSurvivorRatio,    50,                                \
3415           "Desired percentage of survivor space used after scavenge")       \
3416           range(0, 100)                                                     \
3417                                                                             \
3418   product(uintx, MarkSweepDeadRatio,     5,                                 \
3419           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3420           "Serial mark sweep treats this as both the minimum and maximum "  \
3421           "value. "                                                         \
3422           "CMS uses this value only if it falls back to mark sweep. "       \
3423           "Par compact uses a variable scale based on the density of the "  \
3424           "generation and treats this as the maximum value when the heap "  \
3425           "is either completely full or completely empty.  Par compact "    \
3426           "also has a smaller default value; see arguments.cpp.")           \
3427           range(0, 100)                                                     \
3428                                                                             \
3429   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3430           "How often should we fully compact the heap (ignoring the dead "  \
3431           "space parameters)")                                              \
3432           range(1, max_uintx)                                               \
3433                                                                             \
3434   product(intx, PrintCMSStatistics, 0,                                      \
3435           "Statistics for CMS")                                             \
3436                                                                             \
3437   product(bool, PrintCMSInitiationStatistics, false,                        \
3438           "Statistics for initiating a CMS collection")                     \
3439                                                                             \
3440   product(intx, PrintFLSStatistics, 0,                                      \
3441           "Statistics for CMS' FreeListSpace")                              \
3442                                                                             \
3443   product(intx, PrintFLSCensus, 0,                                          \
3444           "Census for CMS' FreeListSpace")                                  \
3445                                                                             \
3446   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3447           "Delay between expansion and allocation (in milliseconds)")       \
3448                                                                             \
3449   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3450           "Delay in scheduling GC workers (in milliseconds)")               \
3451                                                                             \
3452   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3453           "(Unstable) Number of times to iterate in safepoint loop "        \
3454           "before blocking VM threads ")                                    \
3455                                                                             \
3456   product(intx, DeferPollingPageLoopCount,     -1,                          \
3457           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3458           "before changing safepoint polling page to RO ")                  \
3459                                                                             \
3460   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3461                                                                             \
3462   product(bool, PSChunkLargeArrays, true,                                   \
3463           "Process large arrays in chunks")                                 \
3464                                                                             \
3465   product(uintx, GCDrainStackTargetSize, 64,                                \
3466           "Number of entries we will try to leave on the stack "            \
3467           "during parallel gc")                                             \
3468                                                                             \
3469   /* stack parameters */                                                    \
3470   product_pd(intx, StackYellowPages,                                        \
3471           "Number of yellow zone (recoverable overflows) pages")            \
3472           range(1, max_intx)                                                \
3473                                                                             \
3474   product_pd(intx, StackRedPages,                                           \
3475           "Number of red zone (unrecoverable overflows) pages")             \
3476           range(1, max_intx)                                                \
3477                                                                             \
3478   /* greater stack shadow pages can't generate instruction to bang stack */ \
3479   product_pd(intx, StackShadowPages,                                        \
3480           "Number of shadow zone (for overflow checking) pages "            \
3481           "this should exceed the depth of the VM and native call stack")   \
3482           range(1, 50)                                                      \
3483                                                                             \
3484   product_pd(intx, ThreadStackSize,                                         \
3485           "Thread Stack Size (in Kbytes)")                                  \
3486                                                                             \
3487   product_pd(intx, VMThreadStackSize,                                       \
3488           "Non-Java Thread Stack Size (in Kbytes)")                         \
3489                                                                             \
3490   product_pd(intx, CompilerThreadStackSize,                                 \
3491           "Compiler Thread Stack Size (in Kbytes)")                         \
3492                                                                             \
3493   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3494           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3495                                                                             \
3496   /* code cache parameters                                    */            \
3497   /* ppc64/tiered compilation has large code-entry alignment. */            \
3498   develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\
3499           "Code cache segment size (in bytes) - smallest unit of "          \
3500           "allocation")                                                     \
3501           range(1, 1024)                                                    \
3502                                                                             \
3503   develop_pd(intx, CodeEntryAlignment,                                      \
3504           "Code entry alignment for generated code (in bytes)")             \
3505                                                                             \
3506   product_pd(intx, OptoLoopAlignment,                                       \
3507           "Align inner loops to zero relative to this modulus")             \
3508                                                                             \
3509   product_pd(uintx, InitialCodeCacheSize,                                   \
3510           "Initial code cache size (in bytes)")                             \
3511                                                                             \
3512   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3513           "Minimum code cache size (in bytes) required to start VM.")       \
3514                                                                             \
3515   product(bool, SegmentedCodeCache, false,                                  \
3516           "Use a segmented code cache")                                     \
3517                                                                             \
3518   product_pd(uintx, ReservedCodeCacheSize,                                  \
3519           "Reserved code cache size (in bytes) - maximum code cache size")  \
3520                                                                             \
3521   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3522           "Size of code heap with non-profiled methods (in bytes)")         \
3523                                                                             \
3524   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3525           "Size of code heap with profiled methods (in bytes)")             \
3526                                                                             \
3527   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3528           "Size of code heap with non-nmethods (in bytes)")                 \
3529                                                                             \
3530   product_pd(uintx, CodeCacheExpansionSize,                                 \
3531           "Code cache expansion size (in bytes)")                           \
3532                                                                             \
3533   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3534           "Minimum number of segments in a code cache block")               \
3535           range(1, 100)                                                     \
3536                                                                             \
3537   notproduct(bool, ExitOnFullCodeCache, false,                              \
3538           "Exit the VM if we fill the code cache")                          \
3539                                                                             \
3540   product(bool, UseCodeCacheFlushing, true,                                 \
3541           "Remove cold/old nmethods from the code cache")                   \
3542                                                                             \
3543   product(uintx, StartAggressiveSweepingAt, 10,                             \
3544           "Start aggressive sweeping if X[%] of the code cache is free."    \
3545           "Segmented code cache: X[%] of the non-profiled heap."            \
3546           "Non-segmented code cache: X[%] of the total code cache")         \
3547           range(0, 100)                                                     \
3548                                                                             \
3549   /* interpreter debugging */                                               \
3550   develop(intx, BinarySwitchThreshold, 5,                                   \
3551           "Minimal number of lookupswitch entries for rewriting to binary " \
3552           "switch")                                                         \
3553                                                                             \
3554   develop(intx, StopInterpreterAt, 0,                                       \
3555           "Stop interpreter execution at specified bytecode number")        \
3556                                                                             \
3557   develop(intx, TraceBytecodesAt, 0,                                        \
3558           "Trace bytecodes starting with specified bytecode number")        \
3559                                                                             \
3560   /* compiler interface */                                                  \
3561   develop(intx, CIStart, 0,                                                 \
3562           "The id of the first compilation to permit")                      \
3563                                                                             \
3564   develop(intx, CIStop, max_jint,                                           \
3565           "The id of the last compilation to permit")                       \
3566                                                                             \
3567   develop(intx, CIStartOSR, 0,                                              \
3568           "The id of the first osr compilation to permit "                  \
3569           "(CICountOSR must be on)")                                        \
3570                                                                             \
3571   develop(intx, CIStopOSR, max_jint,                                        \
3572           "The id of the last osr compilation to permit "                   \
3573           "(CICountOSR must be on)")                                        \
3574                                                                             \
3575   develop(intx, CIBreakAtOSR, -1,                                           \
3576           "The id of osr compilation to break at")                          \
3577                                                                             \
3578   develop(intx, CIBreakAt, -1,                                              \
3579           "The id of compilation to break at")                              \
3580                                                                             \
3581   product(ccstrlist, CompileOnly, "",                                       \
3582           "List of methods (pkg/class.name) to restrict compilation to")    \
3583                                                                             \
3584   product(ccstr, CompileCommandFile, NULL,                                  \
3585           "Read compiler commands from this file [.hotspot_compiler]")      \
3586                                                                             \
3587   product(ccstrlist, CompileCommand, "",                                    \
3588           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3589                                                                             \
3590   develop(bool, ReplayCompiles, false,                                      \
3591           "Enable replay of compilations from ReplayDataFile")              \
3592                                                                             \
3593   product(ccstr, ReplayDataFile, NULL,                                      \
3594           "File containing compilation replay information"                  \
3595           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3596                                                                             \
3597    product(ccstr, InlineDataFile, NULL,                                     \
3598           "File containing inlining replay information"                     \
3599           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3600                                                                             \
3601   develop(intx, ReplaySuppressInitializers, 2,                              \
3602           "Control handling of class initialization during replay: "        \
3603           "0 - don't do anything special; "                                 \
3604           "1 - treat all class initializers as empty; "                     \
3605           "2 - treat class initializers for application classes as empty; " \
3606           "3 - allow all class initializers to run during bootstrap but "   \
3607           "    pretend they are empty after starting replay")               \
3608           range(0, 3)                                                       \
3609                                                                             \
3610   develop(bool, ReplayIgnoreInitErrors, false,                              \
3611           "Ignore exceptions thrown during initialization for replay")      \
3612                                                                             \
3613   product(bool, DumpReplayDataOnError, true,                                \
3614           "Record replay data for crashing compiler threads")               \
3615                                                                             \
3616   product(bool, CICompilerCountPerCPU, false,                               \
3617           "1 compiler thread for log(N CPUs)")                              \
3618                                                                             \
3619   develop(intx, CIFireOOMAt,    -1,                                         \
3620           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3621           "(non-negative value throws OOM after this many CI accesses "     \
3622           "in each compile)")                                               \
3623   notproduct(intx, CICrashAt, -1,                                           \
3624           "id of compilation to trigger assert in compiler thread for "     \
3625           "the purpose of testing, e.g. generation of replay data")         \
3626   notproduct(bool, CIObjectFactoryVerify, false,                            \
3627           "enable potentially expensive verification in ciObjectFactory")   \
3628                                                                             \
3629   /* Priorities */                                                          \
3630   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3631                                                                             \
3632   product(intx, ThreadPriorityPolicy, 0,                                    \
3633           "0 : Normal.                                                     "\
3634           "    VM chooses priorities that are appropriate for normal       "\
3635           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3636           "    to normal native priority. Java priorities below "           \
3637           "    NORM_PRIORITY map to lower native priority values. On       "\
3638           "    Windows applications are allowed to use higher native       "\
3639           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3640           "    not use the highest possible native priority,               "\
3641           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3642           "    system threads. On Linux thread priorities are ignored      "\
3643           "    because the OS does not support static priority in          "\
3644           "    SCHED_OTHER scheduling class which is the only choice for   "\
3645           "    non-root, non-realtime applications.                        "\
3646           "1 : Aggressive.                                                 "\
3647           "    Java thread priorities map over to the entire range of      "\
3648           "    native thread priorities. Higher Java thread priorities map "\
3649           "    to higher native thread priorities. This policy should be   "\
3650           "    used with care, as sometimes it can cause performance       "\
3651           "    degradation in the application and/or the entire system. On "\
3652           "    Linux this policy requires root privilege.")                 \
3653           range(0, 1)                                                       \
3654                                                                             \
3655   product(bool, ThreadPriorityVerbose, false,                               \
3656           "Print priority changes")                                         \
3657                                                                             \
3658   product(intx, CompilerThreadPriority, -1,                                 \
3659           "The native priority at which compiler threads should run "       \
3660           "(-1 means no change)")                                           \
3661                                                                             \
3662   product(intx, VMThreadPriority, -1,                                       \
3663           "The native priority at which the VM thread should run "          \
3664           "(-1 means no change)")                                           \
3665                                                                             \
3666   product(bool, CompilerThreadHintNoPreempt, true,                          \
3667           "(Solaris only) Give compiler threads an extra quanta")           \
3668                                                                             \
3669   product(bool, VMThreadHintNoPreempt, false,                               \
3670           "(Solaris only) Give VM thread an extra quanta")                  \
3671                                                                             \
3672   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3673           "Map Java priorities to OS priorities")                           \
3674                                                                             \
3675   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3676           "Map Java priorities to OS priorities")                           \
3677                                                                             \
3678   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3679           "Map Java priorities to OS priorities")                           \
3680                                                                             \
3681   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3682           "Map Java priorities to OS priorities")                           \
3683                                                                             \
3684   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3685           "Map Java priorities to OS priorities")                           \
3686                                                                             \
3687   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3688           "Map Java priorities to OS priorities")                           \
3689                                                                             \
3690   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3691           "Map Java priorities to OS priorities")                           \
3692                                                                             \
3693   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3694           "Map Java priorities to OS priorities")                           \
3695                                                                             \
3696   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3697           "Map Java priorities to OS priorities")                           \
3698                                                                             \
3699   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3700           "Map Java priorities to OS priorities")                           \
3701                                                                             \
3702   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3703           "Java thread priority 10 maps to critical scheduling priority")   \
3704                                                                             \
3705   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3706           "Compiler thread(s) run at critical scheduling priority")         \
3707                                                                             \
3708   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3709           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3710                                                                             \
3711   /* compiler debugging */                                                  \
3712   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3713           "First class to consider when using +CompileTheWorld")            \
3714                                                                             \
3715   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3716           "Last class to consider when using +CompileTheWorld")             \
3717                                                                             \
3718   develop(intx, NewCodeParameter,      0,                                   \
3719           "Testing Only: Create a dedicated integer parameter before "      \
3720           "putback")                                                        \
3721                                                                             \
3722   /* new oopmap storage allocation */                                       \
3723   develop(intx, MinOopMapAllocation,     8,                                 \
3724           "Minimum number of OopMap entries in an OopMapSet")               \
3725                                                                             \
3726   /* Background Compilation */                                              \
3727   develop(intx, LongCompileThreshold,     50,                               \
3728           "Used with +TraceLongCompiles")                                   \
3729                                                                             \
3730   /* recompilation */                                                       \
3731   product_pd(intx, CompileThreshold,                                        \
3732           "number of interpreted method invocations before (re-)compiling") \
3733                                                                             \
3734   product(double, CompileThresholdScaling, 1.0,                             \
3735           "Factor to control when first compilation happens "               \
3736           "(both with and without tiered compilation): "                    \
3737           "values greater than 1.0 delay counter overflow, "                \
3738           "values between 0 and 1.0 rush counter overflow, "                \
3739           "value of 1.0 leaves compilation thresholds unchanged "           \
3740           "value of 0.0 is equivalent to -Xint. "                           \
3741           ""                                                                \
3742           "Flag can be set as per-method option. "                          \
3743           "If a value is specified for a method, compilation thresholds "   \
3744           "for that method are scaled by both the value of the global flag "\
3745           "and the value of the per-method flag.")                          \
3746                                                                             \
3747   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3748           "Interpreter (tier 0) invocation notification frequency")         \
3749                                                                             \
3750   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3751           "C1 without MDO (tier 2) invocation notification frequency")      \
3752                                                                             \
3753   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3754           "C1 with MDO profiling (tier 3) invocation notification "         \
3755           "frequency")                                                      \
3756                                                                             \
3757   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3758           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3759                                                                             \
3760   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3761           "Interpreter (tier 0) invocation notification frequency")         \
3762                                                                             \
3763   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3764           "C1 without MDO (tier 2) invocation notification frequency")      \
3765                                                                             \
3766   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3767           "C1 with MDO profiling (tier 3) invocation notification "         \
3768           "frequency")                                                      \
3769                                                                             \
3770   product(intx, Tier2CompileThreshold, 0,                                   \
3771           "threshold at which tier 2 compilation is invoked")               \
3772                                                                             \
3773   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3774           "Back edge threshold at which tier 2 compilation is invoked")     \
3775                                                                             \
3776   product(intx, Tier3InvocationThreshold, 200,                              \
3777           "Compile if number of method invocations crosses this "           \
3778           "threshold")                                                      \
3779                                                                             \
3780   product(intx, Tier3MinInvocationThreshold, 100,                           \
3781           "Minimum invocation to compile at tier 3")                        \
3782                                                                             \
3783   product(intx, Tier3CompileThreshold, 2000,                                \
3784           "Threshold at which tier 3 compilation is invoked (invocation "   \
3785           "minimum must be satisfied")                                      \
3786                                                                             \
3787   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3788           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3789                                                                             \
3790   product(intx, Tier4InvocationThreshold, 5000,                             \
3791           "Compile if number of method invocations crosses this "           \
3792           "threshold")                                                      \
3793                                                                             \
3794   product(intx, Tier4MinInvocationThreshold, 600,                           \
3795           "Minimum invocation to compile at tier 4")                        \
3796                                                                             \
3797   product(intx, Tier4CompileThreshold, 15000,                               \
3798           "Threshold at which tier 4 compilation is invoked (invocation "   \
3799           "minimum must be satisfied")                                      \
3800                                                                             \
3801   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3802           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3803                                                                             \
3804   product(intx, Tier3DelayOn, 5,                                            \
3805           "If C2 queue size grows over this amount per compiler thread "    \
3806           "stop compiling at tier 3 and start compiling at tier 2")         \
3807                                                                             \
3808   product(intx, Tier3DelayOff, 2,                                           \
3809           "If C2 queue size is less than this amount per compiler thread "  \
3810           "allow methods compiled at tier 2 transition to tier 3")          \
3811                                                                             \
3812   product(intx, Tier3LoadFeedback, 5,                                       \
3813           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3814           "reaches this amount per compiler thread")                        \
3815                                                                             \
3816   product(intx, Tier4LoadFeedback, 3,                                       \
3817           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3818           "reaches this amount per compiler thread")                        \
3819                                                                             \
3820   product(intx, TieredCompileTaskTimeout, 50,                               \
3821           "Kill compile task if method was not used within "                \
3822           "given timeout in milliseconds")                                  \
3823                                                                             \
3824   product(intx, TieredStopAtLevel, 4,                                       \
3825           "Stop at given compilation level")                                \
3826                                                                             \
3827   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3828           "Start profiling in interpreter if the counters exceed tier 3 "   \
3829           "thresholds by the specified percentage")                         \
3830                                                                             \
3831   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3832           "Increase the compile threshold for C1 compilation if the code "  \
3833           "cache is filled by the specified percentage")                    \
3834           range(0, 99)                                                      \
3835                                                                             \
3836   product(intx, TieredRateUpdateMinTime, 1,                                 \
3837           "Minimum rate sampling interval (in milliseconds)")               \
3838                                                                             \
3839   product(intx, TieredRateUpdateMaxTime, 25,                                \
3840           "Maximum rate sampling interval (in milliseconds)")               \
3841                                                                             \
3842   product_pd(bool, TieredCompilation,                                       \
3843           "Enable tiered compilation")                                      \
3844                                                                             \
3845   product(bool, PrintTieredEvents, false,                                   \
3846           "Print tiered events notifications")                              \
3847                                                                             \
3848   product_pd(intx, OnStackReplacePercentage,                                \
3849           "NON_TIERED number of method invocations/branches (expressed as " \
3850           "% of CompileThreshold) before (re-)compiling OSR code")          \
3851                                                                             \
3852   product(intx, InterpreterProfilePercentage, 33,                           \
3853           "NON_TIERED number of method invocations/branches (expressed as " \
3854           "% of CompileThreshold) before profiling in the interpreter")     \
3855           range(0, 100)                                                     \
3856                                                                             \
3857   develop(intx, MaxRecompilationSearchLength,    10,                        \
3858           "The maximum number of frames to inspect when searching for "     \
3859           "recompilee")                                                     \
3860                                                                             \
3861   develop(intx, MaxInterpretedSearchLength,     3,                          \
3862           "The maximum number of interpreted frames to skip when searching "\
3863           "for recompilee")                                                 \
3864                                                                             \
3865   develop(intx, DesiredMethodLimit,  8000,                                  \
3866           "The desired maximum method size (in bytecodes) after inlining")  \
3867                                                                             \
3868   develop(intx, HugeMethodLimit,  8000,                                     \
3869           "Don't compile methods larger than this if "                      \
3870           "+DontCompileHugeMethods")                                        \
3871                                                                             \
3872   /* New JDK 1.4 reflection implementation */                               \
3873                                                                             \
3874   develop(intx, FastSuperclassLimit, 8,                                     \
3875           "Depth of hardwired instanceof accelerator array")                \
3876                                                                             \
3877   /* Properties for Java libraries  */                                      \
3878                                                                             \
3879   product(size_t, MaxDirectMemorySize, 0,                                   \
3880           "Maximum total size of NIO direct-buffer allocations")            \
3881                                                                             \
3882   /* Flags used for temporary code during development  */                   \
3883                                                                             \
3884   diagnostic(bool, UseNewCode, false,                                       \
3885           "Testing Only: Use the new version while testing")                \
3886                                                                             \
3887   diagnostic(bool, UseNewCode2, false,                                      \
3888           "Testing Only: Use the new version while testing")                \
3889                                                                             \
3890   diagnostic(bool, UseNewCode3, false,                                      \
3891           "Testing Only: Use the new version while testing")                \
3892                                                                             \
3893   /* flags for performance data collection */                               \
3894                                                                             \
3895   product(bool, UsePerfData, falseInEmbedded,                               \
3896           "Flag to disable jvmstat instrumentation for performance testing "\
3897           "and problem isolation purposes")                                 \
3898                                                                             \
3899   product(bool, PerfDataSaveToFile, false,                                  \
3900           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3901                                                                             \
3902   product(ccstr, PerfDataSaveFile, NULL,                                    \
3903           "Save PerfData memory to the specified absolute pathname. "       \
3904           "The string %p in the file name (if present) "                    \
3905           "will be replaced by pid")                                        \
3906                                                                             \
3907   product(intx, PerfDataSamplingInterval, 50,                               \
3908           "Data sampling interval (in milliseconds)")                       \
3909                                                                             \
3910   develop(bool, PerfTraceDataCreation, false,                               \
3911           "Trace creation of Performance Data Entries")                     \
3912                                                                             \
3913   develop(bool, PerfTraceMemOps, false,                                     \
3914           "Trace PerfMemory create/attach/detach calls")                    \
3915                                                                             \
3916   product(bool, PerfDisableSharedMem, false,                                \
3917           "Store performance data in standard memory")                      \
3918                                                                             \
3919   product(intx, PerfDataMemorySize, 64*K,                                   \
3920           "Size of performance data memory region. Will be rounded "        \
3921           "up to a multiple of the native os page size.")                   \
3922                                                                             \
3923   product(intx, PerfMaxStringConstLength, 1024,                             \
3924           "Maximum PerfStringConstant string length before truncation")     \
3925                                                                             \
3926   product(bool, PerfAllowAtExitRegistration, false,                         \
3927           "Allow registration of atexit() methods")                         \
3928                                                                             \
3929   product(bool, PerfBypassFileSystemCheck, false,                           \
3930           "Bypass Win32 file system criteria checks (Windows Only)")        \
3931                                                                             \
3932   product(intx, UnguardOnExecutionViolation, 0,                             \
3933           "Unguard page and retry on no-execute fault (Win32 only) "        \
3934           "0=off, 1=conservative, 2=aggressive")                            \
3935           range(0, 2)                                                       \
3936                                                                             \
3937   /* Serviceability Support */                                              \
3938                                                                             \
3939   product(bool, ManagementServer, false,                                    \
3940           "Create JMX Management Server")                                   \
3941                                                                             \
3942   product(bool, DisableAttachMechanism, false,                              \
3943           "Disable mechanism that allows tools to attach to this VM")       \
3944                                                                             \
3945   product(bool, StartAttachListener, false,                                 \
3946           "Always start Attach Listener at VM startup")                     \
3947                                                                             \
3948   manageable(bool, PrintConcurrentLocks, false,                             \
3949           "Print java.util.concurrent locks in thread dump")                \
3950                                                                             \
3951   product(bool, TransmitErrorReport, false,                                 \
3952           "Enable error report transmission on erroneous termination")      \
3953                                                                             \
3954   product(ccstr, ErrorReportServer, NULL,                                   \
3955           "Override built-in error report server address")                  \
3956                                                                             \
3957   /* Shared spaces */                                                       \
3958                                                                             \
3959   product(bool, UseSharedSpaces, true,                                      \
3960           "Use shared spaces for metadata")                                 \
3961                                                                             \
3962   product(bool, VerifySharedSpaces, false,                                  \
3963           "Verify shared spaces (false for default archive, true for "      \
3964           "archive specified by -XX:SharedArchiveFile)")                    \
3965                                                                             \
3966   product(bool, RequireSharedSpaces, false,                                 \
3967           "Require shared spaces for metadata")                             \
3968                                                                             \
3969   product(bool, DumpSharedSpaces, false,                                    \
3970           "Special mode: JVM reads a class list, loads classes, builds "    \
3971           "shared spaces, and dumps the shared spaces to a file to be "     \
3972           "used in future JVM runs")                                        \
3973                                                                             \
3974   product(bool, PrintSharedSpaces, false,                                   \
3975           "Print usage of shared spaces")                                   \
3976                                                                             \
3977   product(bool, PrintSharedArchiveAndExit, false,                           \
3978           "Print shared archive file contents")                             \
3979                                                                             \
3980   product(bool, PrintSharedDictionary, false,                               \
3981           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3982           "dictionary")                                                     \
3983                                                                             \
3984   product(size_t, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),     \
3985           "Size of read-write space for metadata (in bytes)")               \
3986                                                                             \
3987   product(size_t, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3988           "Size of read-only space for metadata (in bytes)")                \
3989                                                                             \
3990   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3991           "Size of the shared miscellaneous data area (in bytes)")          \
3992                                                                             \
3993   product(uintx, SharedMiscCodeSize,    120*K,                              \
3994           "Size of the shared miscellaneous code area (in bytes)")          \
3995                                                                             \
3996   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3997           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3998           "Address to allocate shared memory region for class data")        \
3999                                                                             \
4000   product(uintx, SharedSymbolTableBucketSize, 4,                            \
4001           "Average number of symbols per bucket in shared table")           \
4002                                                                             \
4003   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
4004           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
4005           "classes. Just exclude them from the shared dictionary.")         \
4006                                                                             \
4007   diagnostic(bool, PrintMethodHandleStubs, false,                           \
4008           "Print generated stub code for method handles")                   \
4009                                                                             \
4010   develop(bool, TraceMethodHandles, false,                                  \
4011           "trace internal method handle operations")                        \
4012                                                                             \
4013   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
4014           "perform extra checks when constructing method handles")          \
4015                                                                             \
4016   diagnostic(bool, ShowHiddenFrames, false,                                 \
4017           "show method handle implementation frames (usually hidden)")      \
4018                                                                             \
4019   experimental(bool, TrustFinalNonStaticFields, false,                      \
4020           "trust final non-static declarations for constant folding")       \
4021                                                                             \
4022   diagnostic(bool, FoldStableValues, true,                                  \
4023           "Optimize loads from stable fields (marked w/ @Stable)")          \
4024                                                                             \
4025   develop(bool, TraceInvokeDynamic, false,                                  \
4026           "trace internal invoke dynamic operations")                       \
4027                                                                             \
4028   diagnostic(bool, PauseAtStartup,      false,                              \
4029           "Causes the VM to pause at startup time and wait for the pause "  \
4030           "file to be removed (default: ./vm.paused.<pid>)")                \
4031                                                                             \
4032   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
4033           "The file to create and for whose removal to await when pausing " \
4034           "at startup. (default: ./vm.paused.<pid>)")                       \
4035                                                                             \
4036   diagnostic(bool, PauseAtExit, false,                                      \
4037           "Pause and wait for keypress on exit if a debugger is attached")  \
4038                                                                             \
4039   product(bool, ExtendedDTraceProbes,    false,                             \
4040           "Enable performance-impacting dtrace probes")                     \
4041                                                                             \
4042   product(bool, DTraceMethodProbes, false,                                  \
4043           "Enable dtrace probes for method-entry and method-exit")          \
4044                                                                             \
4045   product(bool, DTraceAllocProbes, false,                                   \
4046           "Enable dtrace probes for object allocation")                     \
4047                                                                             \
4048   product(bool, DTraceMonitorProbes, false,                                 \
4049           "Enable dtrace probes for monitor events")                        \
4050                                                                             \
4051   product(bool, RelaxAccessControlCheck, false,                             \
4052           "Relax the access control checks in the verifier")                \
4053                                                                             \
4054   product(uintx, StringTableSize, defaultStringTableSize,                   \
4055           "Number of buckets in the interned String table")                 \
4056           range(minimumStringTableSize, 111*defaultStringTableSize)         \
4057                                                                             \
4058   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
4059           "Number of buckets in the JVM internal Symbol table")             \
4060           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
4061                                                                             \
4062   product(bool, UseStringDeduplication, false,                              \
4063           "Use string deduplication")                                       \
4064                                                                             \
4065   product(bool, PrintStringDeduplicationStatistics, false,                  \
4066           "Print string deduplication statistics")                          \
4067                                                                             \
4068   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4069           "A string must reach this age (or be promoted to an old region) " \
4070           "to be considered for deduplication")                             \
4071           range(1, markOopDesc::max_age)                                    \
4072                                                                             \
4073   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4074           "Force table resize every time the table is scanned")             \
4075                                                                             \
4076   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4077           "Force table rehash every time the table is scanned")             \
4078                                                                             \
4079   develop(bool, TraceDefaultMethods, false,                                 \
4080           "Trace the default method processing steps")                      \
4081                                                                             \
4082   diagnostic(bool, WhiteBoxAPI, false,                                      \
4083           "Enable internal testing APIs")                                   \
4084                                                                             \
4085   product(bool, PrintGCCause, true,                                         \
4086           "Include GC cause in GC logging")                                 \
4087                                                                             \
4088   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4089            "Default survivor space alignment in bytes")                     \
4090            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4091                                                                             \
4092   product(bool , AllowNonVirtualCalls, false,                               \
4093           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4094                                                                             \
4095   product(ccstr, DumpLoadedClassList, NULL,                                 \
4096           "Dump the names all loaded classes, that could be stored into "   \
4097           "the CDS archive, in the specified file")                         \
4098                                                                             \
4099   product(ccstr, SharedClassListFile, NULL,                                 \
4100           "Override the default CDS class list")                            \
4101                                                                             \
4102   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4103           "Override the default location of the CDS archive file")          \
4104                                                                             \
4105   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4106           "Extra classlist for building the CDS archive file")              \
4107                                                                             \
4108   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4109           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4110           "Allocation less than this value will be allocated "              \
4111           "using malloc. Larger allocations will use mmap.")                \
4112                                                                             \
4113   experimental(bool, AlwaysAtomicAccesses, false,                           \
4114           "Accesses to all variables should always be atomic")              \
4115                                                                             \
4116   product(bool, EnableTracing, false,                                       \
4117           "Enable event-based tracing")                                     \
4118                                                                             \
4119   product(bool, UseLockedTracing, false,                                    \
4120           "Use locked-tracing when doing event-based tracing")              \
4121                                                                             \
4122   diagnostic(bool, UseUnalignedAccesses, false,                             \
4123           "Use unaligned memory accesses in sun.misc.Unsafe")               \
4124                                                                             \
4125   product_pd(bool, PreserveFramePointer,                                    \
4126              "Use the FP register for holding the frame pointer "           \
4127              "and not as a general purpose register.")                      \
4128                                                                             \
4129   diagnostic(bool, UseImplicitStableValues, true,                           \
4130           "Mark well-known stable fields as such (e.g. String.value)")      \
4131                                                                             \
4132   diagnostic(bool, CheckIntrinsics, true,                                   \
4133              "When a class C is loaded, check that "                        \
4134              "(1) all intrinsics defined by the VM for class C are present "\
4135              "in the loaded class file and are marked with the "            \
4136              "@HotSpotIntrinsicCandidate annotation, that "                 \
4137              "(2) there is an intrinsic registered for all loaded methods " \
4138              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4139              "annotation, and that "                                        \
4140              "(3) no orphan methods exist for class C (i.e., methods for "  \
4141              "which the VM declares an intrinsic but that are not declared "\
4142              "in the loaded class C. "                                      \
4143              "Check (3) is available only in debug builds.")
4144 
4145 /*
4146  *  Macros for factoring of globals
4147  */
4148 
4149 // Interface macros
4150 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4151 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4152 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4153 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4154 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4155 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4156 #ifdef PRODUCT
4157 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
4158 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
4159 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
4160 #else
4161 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4162 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4163 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4164 #endif // PRODUCT
4165 // Special LP64 flags, product only needed for now.
4166 #ifdef _LP64
4167 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4168 #else
4169 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4170 #endif // _LP64
4171 
4172 // Implementation macros
4173 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4174 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4175 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4176 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4177 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4178 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4179 #ifdef PRODUCT
4180 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
4181 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
4182 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
4183 #else
4184 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4185 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4186 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4187 #endif // PRODUCT
4188 #ifdef _LP64
4189 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4190 #else
4191 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4192 #endif // _LP64
4193 
4194 // Only materialize src code for range checking when required, ignore otherwise
4195 #define IGNORE_RANGE(a, b)
4196 // Only materialize src code for contraint checking when required, ignore otherwise
4197 #define IGNORE_CONSTRAINT(func,type)
4198 
4199 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4200               DECLARE_PD_DEVELOPER_FLAG, \
4201               DECLARE_PRODUCT_FLAG, \
4202               DECLARE_PD_PRODUCT_FLAG, \
4203               DECLARE_DIAGNOSTIC_FLAG, \
4204               DECLARE_EXPERIMENTAL_FLAG, \
4205               DECLARE_NOTPRODUCT_FLAG, \
4206               DECLARE_MANAGEABLE_FLAG, \
4207               DECLARE_PRODUCT_RW_FLAG, \
4208               DECLARE_LP64_PRODUCT_FLAG, \
4209               IGNORE_RANGE, \
4210               IGNORE_CONSTRAINT)
4211 
4212 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4213                  DECLARE_PD_DEVELOPER_FLAG, \
4214                  DECLARE_PRODUCT_FLAG, \
4215                  DECLARE_PD_PRODUCT_FLAG, \
4216                  DECLARE_DIAGNOSTIC_FLAG, \
4217                  DECLARE_NOTPRODUCT_FLAG, \
4218                  IGNORE_RANGE, \
4219                  IGNORE_CONSTRAINT)
4220 
4221 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4222            DECLARE_PRODUCT_FLAG, \
4223            DECLARE_DIAGNOSTIC_FLAG, \
4224            DECLARE_EXPERIMENTAL_FLAG, \
4225            DECLARE_NOTPRODUCT_FLAG, \
4226            IGNORE_RANGE, \
4227            IGNORE_CONSTRAINT)
4228 
4229 // Extensions
4230 
4231 #include "runtime/globals_ext.hpp"
4232 
4233 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP