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