1 /*
   2  * Copyright (c) 1997, 2016, 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 #include <float.h> // for DBL_MAX
  30 
  31 // use this for flags that are true per default in the tiered build
  32 // but false in non-tiered builds, and vice versa
  33 #ifdef TIERED
  34 #define  trueInTiered true
  35 #define falseInTiered false
  36 #else
  37 #define  trueInTiered false
  38 #define falseInTiered true
  39 #endif
  40 
  41 #ifdef TARGET_ARCH_x86
  42 # include "globals_x86.hpp"
  43 #endif
  44 #ifdef TARGET_ARCH_sparc
  45 # include "globals_sparc.hpp"
  46 #endif
  47 #ifdef TARGET_ARCH_zero
  48 # include "globals_zero.hpp"
  49 #endif
  50 #ifdef TARGET_ARCH_arm
  51 # include "globals_arm.hpp"
  52 #endif
  53 #ifdef TARGET_ARCH_ppc
  54 # include "globals_ppc.hpp"
  55 #endif
  56 #ifdef TARGET_ARCH_aarch64
  57 # include "globals_aarch64.hpp"
  58 #endif
  59 #ifdef TARGET_OS_FAMILY_linux
  60 # include "globals_linux.hpp"
  61 #endif
  62 #ifdef TARGET_OS_FAMILY_solaris
  63 # include "globals_solaris.hpp"
  64 #endif
  65 #ifdef TARGET_OS_FAMILY_windows
  66 # include "globals_windows.hpp"
  67 #endif
  68 #ifdef TARGET_OS_FAMILY_aix
  69 # include "globals_aix.hpp"
  70 #endif
  71 #ifdef TARGET_OS_FAMILY_bsd
  72 # include "globals_bsd.hpp"
  73 #endif
  74 #ifdef TARGET_OS_ARCH_linux_x86
  75 # include "globals_linux_x86.hpp"
  76 #endif
  77 #ifdef TARGET_OS_ARCH_linux_sparc
  78 # include "globals_linux_sparc.hpp"
  79 #endif
  80 #ifdef TARGET_OS_ARCH_linux_zero
  81 # include "globals_linux_zero.hpp"
  82 #endif
  83 #ifdef TARGET_OS_ARCH_solaris_x86
  84 # include "globals_solaris_x86.hpp"
  85 #endif
  86 #ifdef TARGET_OS_ARCH_solaris_sparc
  87 # include "globals_solaris_sparc.hpp"
  88 #endif
  89 #ifdef TARGET_OS_ARCH_windows_x86
  90 # include "globals_windows_x86.hpp"
  91 #endif
  92 #ifdef TARGET_OS_ARCH_linux_arm
  93 # include "globals_linux_arm.hpp"
  94 #endif
  95 #ifdef TARGET_OS_ARCH_linux_ppc
  96 # include "globals_linux_ppc.hpp"
  97 #endif
  98 #ifdef TARGET_OS_ARCH_linux_aarch64
  99 # include "globals_linux_aarch64.hpp"
 100 #endif
 101 #ifdef TARGET_OS_ARCH_aix_ppc
 102 # include "globals_aix_ppc.hpp"
 103 #endif
 104 #ifdef TARGET_OS_ARCH_bsd_x86
 105 # include "globals_bsd_x86.hpp"
 106 #endif
 107 #ifdef TARGET_OS_ARCH_bsd_zero
 108 # include "globals_bsd_zero.hpp"
 109 #endif
 110 #ifdef COMPILER1
 111 #ifdef TARGET_ARCH_x86
 112 # include "c1_globals_x86.hpp"
 113 #endif
 114 #ifdef TARGET_ARCH_sparc
 115 # include "c1_globals_sparc.hpp"
 116 #endif
 117 #ifdef TARGET_ARCH_arm
 118 # include "c1_globals_arm.hpp"
 119 #endif
 120 #ifdef TARGET_ARCH_aarch64
 121 # include "c1_globals_aarch64.hpp"
 122 #endif
 123 #ifdef TARGET_OS_FAMILY_linux
 124 # include "c1_globals_linux.hpp"
 125 #endif
 126 #ifdef TARGET_OS_FAMILY_solaris
 127 # include "c1_globals_solaris.hpp"
 128 #endif
 129 #ifdef TARGET_OS_FAMILY_windows
 130 # include "c1_globals_windows.hpp"
 131 #endif
 132 #ifdef TARGET_OS_FAMILY_aix
 133 # include "c1_globals_aix.hpp"
 134 #endif
 135 #ifdef TARGET_OS_FAMILY_bsd
 136 # include "c1_globals_bsd.hpp"
 137 #endif
 138 #ifdef TARGET_ARCH_ppc
 139 # include "c1_globals_ppc.hpp"
 140 #endif
 141 #endif
 142 #ifdef COMPILER2
 143 #ifdef TARGET_ARCH_x86
 144 # include "c2_globals_x86.hpp"
 145 #endif
 146 #ifdef TARGET_ARCH_sparc
 147 # include "c2_globals_sparc.hpp"
 148 #endif
 149 #ifdef TARGET_ARCH_arm
 150 # include "c2_globals_arm.hpp"
 151 #endif
 152 #ifdef TARGET_ARCH_ppc
 153 # include "c2_globals_ppc.hpp"
 154 #endif
 155 #ifdef TARGET_ARCH_aarch64
 156 # include "c2_globals_aarch64.hpp"
 157 #endif
 158 #ifdef TARGET_OS_FAMILY_linux
 159 # include "c2_globals_linux.hpp"
 160 #endif
 161 #ifdef TARGET_OS_FAMILY_solaris
 162 # include "c2_globals_solaris.hpp"
 163 #endif
 164 #ifdef TARGET_OS_FAMILY_windows
 165 # include "c2_globals_windows.hpp"
 166 #endif
 167 #ifdef TARGET_OS_FAMILY_aix
 168 # include "c2_globals_aix.hpp"
 169 #endif
 170 #ifdef TARGET_OS_FAMILY_bsd
 171 # include "c2_globals_bsd.hpp"
 172 #endif
 173 #endif
 174 #ifdef SHARK
 175 #ifdef TARGET_ARCH_zero
 176 # include "shark_globals_zero.hpp"
 177 #endif
 178 #endif
 179 
 180 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) && !INCLUDE_JVMCI
 181 define_pd_global(bool, BackgroundCompilation,        false);
 182 define_pd_global(bool, UseTLAB,                      false);
 183 define_pd_global(bool, CICompileOSR,                 false);
 184 define_pd_global(bool, UseTypeProfile,               false);
 185 define_pd_global(bool, UseOnStackReplacement,        false);
 186 define_pd_global(bool, InlineIntrinsics,             false);
 187 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 188 define_pd_global(bool, ProfileInterpreter,           false);
 189 define_pd_global(bool, ProfileTraps,                 false);
 190 define_pd_global(bool, TieredCompilation,            false);
 191 
 192 define_pd_global(intx, CompileThreshold,             0);
 193 
 194 define_pd_global(intx, OnStackReplacePercentage,     0);
 195 define_pd_global(bool, ResizeTLAB,                   false);
 196 define_pd_global(intx, FreqInlineSize,               0);
 197 define_pd_global(size_t, NewSizeThreadIncrease,      4*K);
 198 define_pd_global(intx, InlineClassNatives,           true);
 199 define_pd_global(intx, InlineUnsafeOps,              true);
 200 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 201 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 202 define_pd_global(intx, NonProfiledCodeHeapSize,      0);
 203 define_pd_global(intx, ProfiledCodeHeapSize,         0);
 204 define_pd_global(intx, NonNMethodCodeHeapSize,       32*M);
 205 
 206 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 207 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 208 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 209 define_pd_global(size_t, MetaspaceSize,              ScaleForWordSize(4*M));
 210 define_pd_global(bool, NeverActAsServerClassMachine, true);
 211 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 212 #define CI_COMPILER_COUNT 0
 213 #else
 214 
 215 #if defined(COMPILER2) || INCLUDE_JVMCI
 216 #define CI_COMPILER_COUNT 2
 217 #else
 218 #define CI_COMPILER_COUNT 1
 219 #endif // COMPILER2 || INCLUDE_JVMCI
 220 
 221 #endif // no compilers
 222 
 223 // string type aliases used only in this file
 224 typedef const char* ccstr;
 225 typedef const char* ccstrlist;   // represents string arguments which accumulate
 226 
 227 // function type that will construct default range string
 228 typedef const char* (*RangeStrFunc)(void);
 229 
 230 struct Flag {
 231   enum Flags {
 232     // latest value origin
 233     DEFAULT          = 0,
 234     COMMAND_LINE     = 1,
 235     ENVIRON_VAR      = 2,
 236     CONFIG_FILE      = 3,
 237     MANAGEMENT       = 4,
 238     ERGONOMIC        = 5,
 239     ATTACH_ON_DEMAND = 6,
 240     INTERNAL         = 7,
 241 
 242     LAST_VALUE_ORIGIN = INTERNAL,
 243     VALUE_ORIGIN_BITS = 4,
 244     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 245 
 246     // flag kind
 247     KIND_PRODUCT            = 1 << 4,
 248     KIND_MANAGEABLE         = 1 << 5,
 249     KIND_DIAGNOSTIC         = 1 << 6,
 250     KIND_EXPERIMENTAL       = 1 << 7,
 251     KIND_NOT_PRODUCT        = 1 << 8,
 252     KIND_DEVELOP            = 1 << 9,
 253     KIND_PLATFORM_DEPENDENT = 1 << 10,
 254     KIND_READ_WRITE         = 1 << 11,
 255     KIND_C1                 = 1 << 12,
 256     KIND_C2                 = 1 << 13,
 257     KIND_ARCH               = 1 << 14,
 258     KIND_SHARK              = 1 << 15,
 259     KIND_LP64_PRODUCT       = 1 << 16,
 260     KIND_COMMERCIAL         = 1 << 17,
 261     KIND_JVMCI              = 1 << 18,
 262 
 263     // set this bit if the flag was set on the command line
 264     ORIG_COMMAND_LINE       = 1 << 19,
 265 
 266     KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE)
 267   };
 268 
 269   enum Error {
 270     // no error
 271     SUCCESS = 0,
 272     // flag name is missing
 273     MISSING_NAME,
 274     // flag value is missing
 275     MISSING_VALUE,
 276     // error parsing the textual form of the value
 277     WRONG_FORMAT,
 278     // flag is not writable
 279     NON_WRITABLE,
 280     // flag value is outside of its bounds
 281     OUT_OF_BOUNDS,
 282     // flag value violates its constraint
 283     VIOLATES_CONSTRAINT,
 284     // there is no flag with the given name
 285     INVALID_FLAG,
 286     // the flag can only be set only on command line during invocation of the VM
 287     COMMAND_LINE_ONLY,
 288     // the flag may only be set once
 289     SET_ONLY_ONCE,
 290     // the flag is not writable in this combination of product/debug build
 291     CONSTANT,
 292     // other, unspecified error related to setting the flag
 293     ERR_OTHER
 294   };
 295 
 296   enum MsgType {
 297     NONE = 0,
 298     DIAGNOSTIC_FLAG_BUT_LOCKED,
 299     EXPERIMENTAL_FLAG_BUT_LOCKED,
 300     DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
 301     NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
 302   };
 303 
 304   const char* _type;
 305   const char* _name;
 306   void* _addr;
 307   NOT_PRODUCT(const char* _doc;)
 308   Flags _flags;
 309 
 310   // points to all Flags static array
 311   static Flag* flags;
 312 
 313   // number of flags
 314   static size_t numFlags;
 315 
 316   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 317   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 318   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 319 
 320   static const char* get_int_default_range_str();
 321   static const char* get_uint_default_range_str();
 322   static const char* get_intx_default_range_str();
 323   static const char* get_uintx_default_range_str();
 324   static const char* get_uint64_t_default_range_str();
 325   static const char* get_size_t_default_range_str();
 326   static const char* get_double_default_range_str();
 327 
 328   Flag::Error check_writable(bool changed);
 329 
 330   bool is_bool() const;
 331   bool get_bool() const;
 332   Flag::Error set_bool(bool value);
 333 
 334   bool is_int() const;
 335   int get_int() const;
 336   Flag::Error set_int(int value);
 337 
 338   bool is_uint() const;
 339   uint get_uint() const;
 340   Flag::Error set_uint(uint value);
 341 
 342   bool is_intx() const;
 343   intx get_intx() const;
 344   Flag::Error set_intx(intx value);
 345 
 346   bool is_uintx() const;
 347   uintx get_uintx() const;
 348   Flag::Error set_uintx(uintx value);
 349 
 350   bool is_uint64_t() const;
 351   uint64_t get_uint64_t() const;
 352   Flag::Error set_uint64_t(uint64_t value);
 353 
 354   bool is_size_t() const;
 355   size_t get_size_t() const;
 356   Flag::Error set_size_t(size_t value);
 357 
 358   bool is_double() const;
 359   double get_double() const;
 360   Flag::Error set_double(double value);
 361 
 362   bool is_ccstr() const;
 363   bool ccstr_accumulates() const;
 364   ccstr get_ccstr() const;
 365   Flag::Error set_ccstr(ccstr value);
 366 
 367   Flags get_origin();
 368   void set_origin(Flags origin);
 369 
 370   bool is_default();
 371   bool is_ergonomic();
 372   bool is_command_line();
 373   void set_command_line();
 374 
 375   bool is_product() const;
 376   bool is_manageable() const;
 377   bool is_diagnostic() const;
 378   bool is_experimental() const;
 379   bool is_notproduct() const;
 380   bool is_develop() const;
 381   bool is_read_write() const;
 382   bool is_commercial() const;
 383 
 384   bool is_constant_in_binary() const;
 385 
 386   bool is_unlocker() const;
 387   bool is_unlocked() const;
 388   bool is_writeable() const;
 389   bool is_external() const;
 390 
 391   bool is_unlocker_ext() const;
 392   bool is_unlocked_ext() const;
 393   bool is_writeable_ext() const;
 394   bool is_external_ext() const;
 395 
 396   void unlock_diagnostic();
 397 
 398   Flag::MsgType get_locked_message(char*, int) const;
 399   void get_locked_message_ext(char*, int) const;
 400 
 401   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 402   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 403   void print_kind_and_origin(outputStream* st);
 404   void print_as_flag(outputStream* st);
 405 
 406   static const char* flag_error_str(Flag::Error error);
 407 };
 408 
 409 // debug flags control various aspects of the VM and are global accessible
 410 
 411 // use FlagSetting to temporarily change some debug flag
 412 // e.g. FlagSetting fs(DebugThisAndThat, true);
 413 // restored to previous value upon leaving scope
 414 class FlagSetting {
 415   bool val;
 416   bool* flag;
 417  public:
 418   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 419   ~FlagSetting()                       { *flag = val; }
 420 };
 421 
 422 
 423 class CounterSetting {
 424   intx* counter;
 425  public:
 426   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 427   ~CounterSetting()         { (*counter)--; }
 428 };
 429 
 430 class IntFlagSetting {
 431   int val;
 432   int* flag;
 433  public:
 434   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 435   ~IntFlagSetting()                     { *flag = val; }
 436 };
 437 
 438 class UIntFlagSetting {
 439   uint val;
 440   uint* flag;
 441  public:
 442   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 443   ~UIntFlagSetting()                       { *flag = val; }
 444 };
 445 
 446 class UIntXFlagSetting {
 447   uintx val;
 448   uintx* flag;
 449  public:
 450   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 451   ~UIntXFlagSetting()                         { *flag = val; }
 452 };
 453 
 454 class DoubleFlagSetting {
 455   double val;
 456   double* flag;
 457  public:
 458   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 459   ~DoubleFlagSetting()                           { *flag = val; }
 460 };
 461 
 462 class SizeTFlagSetting {
 463   size_t val;
 464   size_t* flag;
 465  public:
 466   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 467   ~SizeTFlagSetting()                           { *flag = val; }
 468 };
 469 
 470 // Helper class for temporarily saving the value of a flag during a scope.
 471 template <size_t SIZE>
 472 class FlagGuard {
 473   unsigned char _value[SIZE];
 474   void* const _addr;
 475 
 476   // Hide operator new, this class should only be allocated on the stack.
 477   // NOTE: Cannot include memory/allocation.hpp here due to circular
 478   //       dependencies.
 479   void* operator new(size_t size) throw();
 480   void* operator new [](size_t size) throw();
 481 
 482  public:
 483   FlagGuard(void* flag_addr) : _addr(flag_addr) {
 484     memcpy(_value, _addr, SIZE);
 485   }
 486 
 487   ~FlagGuard() {
 488     memcpy(_addr, _value, SIZE);
 489   }
 490 };
 491 
 492 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f)
 493 
 494 class CommandLineFlags {
 495 public:
 496   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 497   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); }
 498   static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
 499   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 500   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 501 
 502   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 503   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); }
 504   static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
 505   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 506   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 507 
 508   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 509   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); }
 510   static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
 511   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 512   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 513 
 514   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 515   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); }
 516   static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
 517   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 518   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 519 
 520   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 521   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); }
 522   static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
 523   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 524   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 525 
 526   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 527   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); }
 528   static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
 529   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 530   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 531 
 532   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 533   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); }
 534   static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
 535   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 536   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 537 
 538   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 539   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); }
 540   static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
 541   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 542   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 543 
 544   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 545   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); }
 546   // Contract:  Flag will make private copy of the incoming value.
 547   // Outgoing value is always malloc-ed, and caller MUST call free.
 548   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 549   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 550 
 551   // Returns false if name is not a command line flag.
 552   static bool wasSetOnCmdline(const char* name, bool* value);
 553   static void printSetFlags(outputStream* out);
 554 
 555   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 556   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 557 
 558   static void verify() PRODUCT_RETURN;
 559 };
 560 
 561 // use this for flags that are true by default in the debug version but
 562 // false in the optimized version, and vice versa
 563 #ifdef ASSERT
 564 #define trueInDebug  true
 565 #define falseInDebug false
 566 #else
 567 #define trueInDebug  false
 568 #define falseInDebug true
 569 #endif
 570 
 571 // use this for flags that are true per default in the product build
 572 // but false in development builds, and vice versa
 573 #ifdef PRODUCT
 574 #define trueInProduct  true
 575 #define falseInProduct false
 576 #else
 577 #define trueInProduct  false
 578 #define falseInProduct true
 579 #endif
 580 
 581 #ifdef JAVASE_EMBEDDED
 582 #define falseInEmbedded false
 583 #else
 584 #define falseInEmbedded true
 585 #endif
 586 
 587 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 588 // product flags are always settable / visible
 589 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 590 
 591 // A flag must be declared with one of the following types:
 592 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 593 // The type "ccstr" is an alias for "const char*" and is used
 594 // only in this file, because the macrology requires single-token type names.
 595 
 596 // Note: Diagnostic options not meant for VM tuning or for product modes.
 597 // They are to be used for VM quality assurance or field diagnosis
 598 // of VM bugs.  They are hidden so that users will not be encouraged to
 599 // try them as if they were VM ordinary execution options.  However, they
 600 // are available in the product version of the VM.  Under instruction
 601 // from support engineers, VM customers can turn them on to collect
 602 // diagnostic information about VM problems.  To use a VM diagnostic
 603 // option, you must first specify +UnlockDiagnosticVMOptions.
 604 // (This master switch also affects the behavior of -Xprintflags.)
 605 //
 606 // experimental flags are in support of features that are not
 607 //    part of the officially supported product, but are available
 608 //    for experimenting with. They could, for example, be performance
 609 //    features that may not have undergone full or rigorous QA, but which may
 610 //    help performance in some cases and released for experimentation
 611 //    by the community of users and developers. This flag also allows one to
 612 //    be able to build a fully supported product that nonetheless also
 613 //    ships with some unsupported, lightly tested, experimental features.
 614 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 615 //    UnlockExperimentalVMOptions flag, which allows the control and
 616 //    modification of the experimental flags.
 617 //
 618 // Nota bene: neither diagnostic nor experimental options should be used casually,
 619 //    and they are not supported on production loads, except under explicit
 620 //    direction from support engineers.
 621 //
 622 // manageable flags are writeable external product flags.
 623 //    They are dynamically writeable through the JDK management interface
 624 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 625 //    These flags are external exported interface (see CCC).  The list of
 626 //    manageable flags can be queried programmatically through the management
 627 //    interface.
 628 //
 629 //    A flag can be made as "manageable" only if
 630 //    - the flag is defined in a CCC as an external exported interface.
 631 //    - the VM implementation supports dynamic setting of the flag.
 632 //      This implies that the VM must *always* query the flag variable
 633 //      and not reuse state related to the flag state at any given time.
 634 //    - you want the flag to be queried programmatically by the customers.
 635 //
 636 // product_rw flags are writeable internal product flags.
 637 //    They are like "manageable" flags but for internal/private use.
 638 //    The list of product_rw flags are internal/private flags which
 639 //    may be changed/removed in a future release.  It can be set
 640 //    through the management interface to get/set value
 641 //    when the name of flag is supplied.
 642 //
 643 //    A flag can be made as "product_rw" only if
 644 //    - the VM implementation supports dynamic setting of the flag.
 645 //      This implies that the VM must *always* query the flag variable
 646 //      and not reuse state related to the flag state at any given time.
 647 //
 648 // Note that when there is a need to support develop flags to be writeable,
 649 // it can be done in the same way as product_rw.
 650 //
 651 // range is a macro that will expand to min and max arguments for range
 652 //    checking code if provided - see commandLineFlagRangeList.hpp
 653 //
 654 // constraint is a macro that will expand to custom function call
 655 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 656 //
 657 // writeable is a macro that controls if and how the value can change during the runtime
 658 //
 659 // writeable(Always) is optional and allows the flag to have its value changed
 660 //    without any limitations at any time
 661 //
 662 // writeable(Once) flag value's can be only set once during the lifetime of VM
 663 //
 664 // writeable(CommandLineOnly) flag value's can be only set from command line
 665 //    (multiple times allowed)
 666 //
 667 
 668 
 669 #define RUNTIME_FLAGS(develop, \
 670                       develop_pd, \
 671                       product, \
 672                       product_pd, \
 673                       diagnostic, \
 674                       diagnostic_pd, \
 675                       experimental, \
 676                       notproduct, \
 677                       manageable, \
 678                       product_rw, \
 679                       lp64_product, \
 680                       range, \
 681                       constraint, \
 682                       writeable) \
 683                                                                             \
 684   lp64_product(bool, UseCompressedOops, false,                              \
 685           "Use 32-bit object references in 64-bit VM. "                     \
 686           "lp64_product means flag is always constant in 32 bit VM")        \
 687                                                                             \
 688   lp64_product(bool, UseCompressedClassPointers, false,                     \
 689           "Use 32-bit class pointers in 64-bit VM. "                        \
 690           "lp64_product means flag is always constant in 32 bit VM")        \
 691                                                                             \
 692   notproduct(bool, CheckCompressedOops, true,                               \
 693           "Generate checks in encoding/decoding code in debug VM")          \
 694                                                                             \
 695   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 696           "Heap allocation steps through preferred address regions to find" \
 697           " where it can allocate the heap. Number of steps to take per "   \
 698           "region.")                                                        \
 699           range(1, max_uintx)                                               \
 700                                                                             \
 701   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 702           "Default object alignment in bytes, 8 is minimum")                \
 703           range(8, 256)                                                     \
 704           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 705                                                                             \
 706   product(bool, AssumeMP, false,                                            \
 707           "Instruct the VM to assume multiple processors are available")    \
 708                                                                             \
 709   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 710   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 711   /* been re-added (see 6401008)                                         */ \
 712   product_pd(bool, UseMembar,                                               \
 713           "(Unstable) Issues membars on thread state transitions")          \
 714                                                                             \
 715   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 716           "Clean the chunk pool asynchronously")                            \
 717                                                                             \
 718   experimental(bool, AlwaysSafeConstructors, false,                         \
 719           "Force safe construction, as if all fields are final.")           \
 720                                                                             \
 721   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 722           "Enable normal processing of flags relating to field diagnostics")\
 723                                                                             \
 724   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 725           "Enable normal processing of flags relating to experimental "     \
 726           "features")                                                       \
 727                                                                             \
 728   product(bool, JavaMonitorsInStackTrace, true,                             \
 729           "Print information about Java monitor locks when the stacks are"  \
 730           "dumped")                                                         \
 731                                                                             \
 732   product_pd(bool, UseLargePages,                                           \
 733           "Use large page memory")                                          \
 734                                                                             \
 735   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 736           "Allocate large pages individually for better affinity")          \
 737                                                                             \
 738   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 739           "Fail large pages individual allocation")                         \
 740                                                                             \
 741   product(bool, UseLargePagesInMetaspace, false,                            \
 742           "Use large page memory in metaspace. "                            \
 743           "Only used if UseLargePages is enabled.")                         \
 744                                                                             \
 745   product(bool, UseNUMA, false,                                             \
 746           "Use NUMA if available")                                          \
 747                                                                             \
 748   product(bool, UseNUMAInterleaving, false,                                 \
 749           "Interleave memory across NUMA nodes if available")               \
 750                                                                             \
 751   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 752           "Granularity to use for NUMA interleaving on Windows OS")         \
 753           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 754                                                                             \
 755   product(bool, ForceNUMA, false,                                           \
 756           "Force NUMA optimizations on single-node/UMA systems")            \
 757                                                                             \
 758   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 759           "Percentage (0-100) used to weight the current sample when "      \
 760           "computing exponentially decaying average for "                   \
 761           "AdaptiveNUMAChunkSizing")                                        \
 762           range(0, 100)                                                     \
 763                                                                             \
 764   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 765           "Do not reallocate more than this amount per collection")         \
 766           range(0, max_uintx)                                               \
 767                                                                             \
 768   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 769           "Enable adaptive chunk sizing for NUMA")                          \
 770                                                                             \
 771   product(bool, NUMAStats, false,                                           \
 772           "Print NUMA stats in detailed heap information")                  \
 773                                                                             \
 774   product(uintx, NUMAPageScanRate, 256,                                     \
 775           "Maximum number of pages to include in the page scan procedure")  \
 776           range(0, max_uintx)                                               \
 777                                                                             \
 778   product_pd(bool, NeedsDeoptSuspend,                                       \
 779           "True for register window machines (sparc/ia64)")                 \
 780                                                                             \
 781   product(intx, UseSSE, 99,                                                 \
 782           "Highest supported SSE instructions set on x86/x64")              \
 783           range(0, 99)                                                      \
 784                                                                             \
 785   product(bool, UseAES, false,                                              \
 786           "Control whether AES instructions can be used on x86/x64")        \
 787                                                                             \
 788   product(bool, UseSHA, false,                                              \
 789           "Control whether SHA instructions can be used "                   \
 790           "on SPARC, on ARM and on x86")                                    \
 791                                                                             \
 792   diagnostic(bool, UseGHASHIntrinsics, false,                               \
 793           "Use intrinsics for GHASH versions of crypto")                    \
 794                                                                             \
 795   product(size_t, LargePageSizeInBytes, 0,                                  \
 796           "Large page size (0 to let VM choose the page size)")             \
 797           range(0, max_uintx)                                               \
 798                                                                             \
 799   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 800           "Use large pages if maximum heap is at least this big")           \
 801           range(0, max_uintx)                                               \
 802                                                                             \
 803   product(bool, ForceTimeHighResolution, false,                             \
 804           "Using high time resolution (for Win32 only)")                    \
 805                                                                             \
 806   develop(bool, TracePcPatching, false,                                     \
 807           "Trace usage of frame::patch_pc")                                 \
 808                                                                             \
 809   develop(bool, TraceJumps, false,                                          \
 810           "Trace assembly jumps in thread ring buffer")                     \
 811                                                                             \
 812   develop(bool, TraceRelocator, false,                                      \
 813           "Trace the bytecode relocator")                                   \
 814                                                                             \
 815   develop(bool, TraceLongCompiles, false,                                   \
 816           "Print out every time compilation is longer than "                \
 817           "a given threshold")                                              \
 818                                                                             \
 819   develop(bool, SafepointALot, false,                                       \
 820           "Generate a lot of safepoints. This works with "                  \
 821           "GuaranteedSafepointInterval")                                    \
 822                                                                             \
 823   product_pd(bool, BackgroundCompilation,                                   \
 824           "A thread requesting compilation is not blocked during "          \
 825           "compilation")                                                    \
 826                                                                             \
 827   product(bool, PrintVMQWaitTime, false,                                    \
 828           "Print out the waiting time in VM operation queue")               \
 829                                                                             \
 830   develop(bool, TraceOopMapGeneration, false,                               \
 831           "Show OopMapGeneration")                                          \
 832                                                                             \
 833   product(bool, MethodFlushing, true,                                       \
 834           "Reclamation of zombie and not-entrant methods")                  \
 835                                                                             \
 836   develop(bool, VerifyStack, false,                                         \
 837           "Verify stack of each thread when it is entering a runtime call") \
 838                                                                             \
 839   diagnostic(bool, ForceUnreachable, false,                                 \
 840           "Make all non code cache addresses to be unreachable by "         \
 841           "forcing use of 64bit literal fixups")                            \
 842                                                                             \
 843   notproduct(bool, StressDerivedPointers, false,                            \
 844           "Force scavenge when a derived pointer is detected on stack "     \
 845           "after rtm call")                                                 \
 846                                                                             \
 847   develop(bool, TraceDerivedPointers, false,                                \
 848           "Trace traversal of derived pointers on stack")                   \
 849                                                                             \
 850   notproduct(bool, TraceCodeBlobStacks, false,                              \
 851           "Trace stack-walk of codeblobs")                                  \
 852                                                                             \
 853   product(bool, PrintJNIResolving, false,                                   \
 854           "Used to implement -v:jni")                                       \
 855                                                                             \
 856   notproduct(bool, PrintRewrites, false,                                    \
 857           "Print methods that are being rewritten")                         \
 858                                                                             \
 859   product(bool, UseInlineCaches, true,                                      \
 860           "Use Inline Caches for virtual calls ")                           \
 861                                                                             \
 862   diagnostic(bool, InlineArrayCopy, true,                                   \
 863           "Inline arraycopy native that is known to be part of "            \
 864           "base library DLL")                                               \
 865                                                                             \
 866   diagnostic(bool, InlineObjectHash, true,                                  \
 867           "Inline Object::hashCode() native that is known to be part "      \
 868           "of base library DLL")                                            \
 869                                                                             \
 870   diagnostic(bool, InlineNatives, true,                                     \
 871           "Inline natives that are known to be part of base library DLL")   \
 872                                                                             \
 873   diagnostic(bool, InlineMathNatives, true,                                 \
 874           "Inline SinD, CosD, etc.")                                        \
 875                                                                             \
 876   diagnostic(bool, InlineClassNatives, true,                                \
 877           "Inline Class.isInstance, etc")                                   \
 878                                                                             \
 879   diagnostic(bool, InlineThreadNatives, true,                               \
 880           "Inline Thread.currentThread, etc")                               \
 881                                                                             \
 882   diagnostic(bool, InlineUnsafeOps, true,                                   \
 883           "Inline memory ops (native methods) from Unsafe")                 \
 884                                                                             \
 885   product(bool, CriticalJNINatives, true,                                   \
 886           "Check for critical JNI entry points")                            \
 887                                                                             \
 888   notproduct(bool, StressCriticalJNINatives, false,                         \
 889           "Exercise register saving code in critical natives")              \
 890                                                                             \
 891   diagnostic(bool, UseAESIntrinsics, false,                                 \
 892           "Use intrinsics for AES versions of crypto")                      \
 893                                                                             \
 894   diagnostic(bool, UseAESCTRIntrinsics, false,                              \
 895           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 896                                                                             \
 897   diagnostic(bool, UseSHA1Intrinsics, false,                                \
 898           "Use intrinsics for SHA-1 crypto hash function. "                 \
 899           "Requires that UseSHA is enabled.")                               \
 900                                                                             \
 901   diagnostic(bool, UseSHA256Intrinsics, false,                              \
 902           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 903           "Requires that UseSHA is enabled.")                               \
 904                                                                             \
 905   diagnostic(bool, UseSHA512Intrinsics, false,                              \
 906           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 907           "Requires that UseSHA is enabled.")                               \
 908                                                                             \
 909   diagnostic(bool, UseCRC32Intrinsics, false,                               \
 910           "use intrinsics for java.util.zip.CRC32")                         \
 911                                                                             \
 912   diagnostic(bool, UseCRC32CIntrinsics, false,                              \
 913           "use intrinsics for java.util.zip.CRC32C")                        \
 914                                                                             \
 915   diagnostic(bool, UseAdler32Intrinsics, false,                             \
 916           "use intrinsics for java.util.zip.Adler32")                       \
 917                                                                             \
 918   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
 919           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 920                                                                             \
 921   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 922          "do not expand intrinsics whose (internal) names appear here")     \
 923                                                                             \
 924   develop(bool, TraceCallFixup, false,                                      \
 925           "Trace all call fixups")                                          \
 926                                                                             \
 927   develop(bool, DeoptimizeALot, false,                                      \
 928           "Deoptimize at every exit from the runtime system")               \
 929                                                                             \
 930   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 931           "A comma separated list of bcis to deoptimize at")                \
 932                                                                             \
 933   product(bool, DeoptimizeRandom, false,                                    \
 934           "Deoptimize random frames on random exit from the runtime system")\
 935                                                                             \
 936   notproduct(bool, ZombieALot, false,                                       \
 937           "Create zombies (non-entrant) at exit from the runtime system")   \
 938                                                                             \
 939   product(bool, UnlinkSymbolsALot, false,                                   \
 940           "Unlink unreferenced symbols from the symbol table at safepoints")\
 941                                                                             \
 942   notproduct(bool, WalkStackALot, false,                                    \
 943           "Trace stack (no print) at every exit from the runtime system")   \
 944                                                                             \
 945   product(bool, Debugging, false,                                           \
 946           "Set when executing debug methods in debug.cpp "                  \
 947           "(to prevent triggering assertions)")                             \
 948                                                                             \
 949   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 950           "Enable strict checks that safepoints cannot happen for threads " \
 951           "that use NoSafepointVerifier")                                   \
 952                                                                             \
 953   notproduct(bool, VerifyLastFrame, false,                                  \
 954           "Verify oops on last frame on entry to VM")                       \
 955                                                                             \
 956   product(bool, FailOverToOldVerifier, true,                                \
 957           "Fail over to old verifier when split verifier fails")            \
 958                                                                             \
 959   develop(bool, ShowSafepointMsgs, false,                                   \
 960           "Show message about safepoint synchronization")                   \
 961                                                                             \
 962   product(bool, SafepointTimeout, false,                                    \
 963           "Time out and warn or fail after SafepointTimeoutDelay "          \
 964           "milliseconds if failed to reach safepoint")                      \
 965                                                                             \
 966   develop(bool, DieOnSafepointTimeout, false,                               \
 967           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 968                                                                             \
 969   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 970   /* typically, at most a few retries are needed                    */      \
 971   product(intx, SuspendRetryCount, 50,                                      \
 972           "Maximum retry count for an external suspend request")            \
 973           range(0, max_intx)                                                \
 974                                                                             \
 975   product(intx, SuspendRetryDelay, 5,                                       \
 976           "Milliseconds to delay per retry (* current_retry_count)")        \
 977           range(0, max_intx)                                                \
 978                                                                             \
 979   product(bool, AssertOnSuspendWaitFailure, false,                          \
 980           "Assert/Guarantee on external suspend wait failure")              \
 981                                                                             \
 982   product(bool, TraceSuspendWaitFailures, false,                            \
 983           "Trace external suspend wait failures")                           \
 984                                                                             \
 985   product(bool, MaxFDLimit, true,                                           \
 986           "Bump the number of file descriptors to maximum in Solaris")      \
 987                                                                             \
 988   diagnostic(bool, LogEvents, true,                                         \
 989           "Enable the various ring buffer event logs")                      \
 990                                                                             \
 991   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 992           "Number of ring buffer event logs")                               \
 993           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 994                                                                             \
 995   product(bool, BytecodeVerificationRemote, true,                           \
 996           "Enable the Java bytecode verifier for remote classes")           \
 997                                                                             \
 998   product(bool, BytecodeVerificationLocal, false,                           \
 999           "Enable the Java bytecode verifier for local classes")            \
1000                                                                             \
1001   develop(bool, ForceFloatExceptions, trueInDebug,                          \
1002           "Force exceptions on FP stack under/overflow")                    \
1003                                                                             \
1004   develop(bool, VerifyStackAtCalls, false,                                  \
1005           "Verify that the stack pointer is unchanged after calls")         \
1006                                                                             \
1007   develop(bool, TraceJavaAssertions, false,                                 \
1008           "Trace java language assertions")                                 \
1009                                                                             \
1010   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
1011           "Temporary - see javaClasses.cpp")                                \
1012                                                                             \
1013   notproduct(bool, PrintMallocFree, false,                                  \
1014           "Trace calls to C heap malloc/free allocation")                   \
1015                                                                             \
1016   notproduct(bool, VerifyCodeCache, false,                                  \
1017           "Verify code cache on memory allocation/deallocation")            \
1018                                                                             \
1019   develop(bool, UseMallocOnly, false,                                       \
1020           "Use only malloc/free for allocation (no resource area/arena)")   \
1021                                                                             \
1022   develop(bool, PrintMalloc, false,                                         \
1023           "Print all malloc/free calls")                                    \
1024                                                                             \
1025   develop(bool, PrintMallocStatistics, false,                               \
1026           "Print malloc/free statistics")                                   \
1027                                                                             \
1028   develop(bool, ZapResourceArea, trueInDebug,                               \
1029           "Zap freed resource/arena space with 0xABABABAB")                 \
1030                                                                             \
1031   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
1032           "Zap freed VM handle space with 0xBCBCBCBC")                      \
1033                                                                             \
1034   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
1035           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
1036                                                                             \
1037   notproduct(bool, ZapStackSegments, trueInDebug,                           \
1038           "Zap allocated/freed stack segments with 0xFADFADED")             \
1039                                                                             \
1040   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
1041           "Zap unused heap space with 0xBAADBABE")                          \
1042                                                                             \
1043   develop(bool, CheckZapUnusedHeapArea, false,                              \
1044           "Check zapping of unused heap space")                             \
1045                                                                             \
1046   develop(bool, ZapFillerObjects, trueInDebug,                              \
1047           "Zap filler objects with 0xDEAFBABE")                             \
1048                                                                             \
1049   develop(bool, PrintVMMessages, true,                                      \
1050           "Print VM messages on console")                                   \
1051                                                                             \
1052   notproduct(uintx, ErrorHandlerTest, 0,                                    \
1053           "If > 0, provokes an error after VM initialization; the value "   \
1054           "determines which error to provoke. See test_error_handler() "    \
1055           "in debug.cpp.")                                                  \
1056                                                                             \
1057   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
1058           "If > 0, provokes an error inside VM error handler (a secondary " \
1059           "crash). see test_error_handler() in debug.cpp.")                 \
1060                                                                             \
1061   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
1062           "If true, tests SafeFetch inside error handler.")                 \
1063                                                                             \
1064   develop(bool, Verbose, false,                                             \
1065           "Print additional debugging information from other modes")        \
1066                                                                             \
1067   develop(bool, PrintMiscellaneous, false,                                  \
1068           "Print uncategorized debugging information (requires +Verbose)")  \
1069                                                                             \
1070   develop(bool, WizardMode, false,                                          \
1071           "Print much more debugging information")                          \
1072                                                                             \
1073   product(bool, ShowMessageBoxOnError, false,                               \
1074           "Keep process alive on VM fatal error")                           \
1075                                                                             \
1076   product(bool, CreateCoredumpOnCrash, true,                                \
1077           "Create core/mini dump on VM fatal error")                        \
1078                                                                             \
1079   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
1080           "Timeout, in seconds, to limit the time spent on writing an "     \
1081           "error log in case of a crash.")                                  \
1082           range(0, (uint64_t)max_jlong/1000)                                \
1083                                                                             \
1084   product_pd(bool, UseOSErrorReporting,                                     \
1085           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
1086                                                                             \
1087   product(bool, SuppressFatalErrorMessage, false,                           \
1088           "Report NO fatal error message (avoid deadlock)")                 \
1089                                                                             \
1090   product(ccstrlist, OnError, "",                                           \
1091           "Run user-defined commands on fatal error; see VMError.cpp "      \
1092           "for examples")                                                   \
1093                                                                             \
1094   product(ccstrlist, OnOutOfMemoryError, "",                                \
1095           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
1096                                                                             \
1097   manageable(bool, HeapDumpBeforeFullGC, false,                             \
1098           "Dump heap to file before any major stop-the-world GC")           \
1099                                                                             \
1100   manageable(bool, HeapDumpAfterFullGC, false,                              \
1101           "Dump heap to file after any major stop-the-world GC")            \
1102                                                                             \
1103   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
1104           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
1105                                                                             \
1106   manageable(ccstr, HeapDumpPath, NULL,                                     \
1107           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
1108           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
1109           "in the working directory)")                                      \
1110                                                                             \
1111   develop(bool, BreakAtWarning, false,                                      \
1112           "Execute breakpoint upon encountering VM warning")                \
1113                                                                             \
1114   develop(bool, UseFakeTimers, false,                                       \
1115           "Tell whether the VM should use system time or a fake timer")     \
1116                                                                             \
1117   product(ccstr, NativeMemoryTracking, "off",                               \
1118           "Native memory tracking options")                                 \
1119                                                                             \
1120   diagnostic(bool, PrintNMTStatistics, false,                               \
1121           "Print native memory tracking summary data if it is on")          \
1122                                                                             \
1123   diagnostic(bool, LogCompilation, false,                                   \
1124           "Log compilation activity in detail to LogFile")                  \
1125                                                                             \
1126   product(bool, PrintCompilation, false,                                    \
1127           "Print compilations")                                             \
1128                                                                             \
1129   diagnostic(bool, TraceNMethodInstalls, false,                             \
1130           "Trace nmethod installation")                                     \
1131                                                                             \
1132   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1133           "0: do not allow scavengable oops in the code cache; "            \
1134           "1: allow scavenging from the code cache; "                       \
1135           "2: emit as many constants as the compiler can see")              \
1136           range(0, 2)                                                       \
1137                                                                             \
1138   product(bool, AlwaysRestoreFPU, false,                                    \
1139           "Restore the FPU control word after every JNI call (expensive)")  \
1140                                                                             \
1141   diagnostic(bool, PrintCompilation2, false,                                \
1142           "Print additional statistics per compilation")                    \
1143                                                                             \
1144   diagnostic(bool, PrintAdapterHandlers, false,                             \
1145           "Print code generated for i2c/c2i adapters")                      \
1146                                                                             \
1147   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1148           "Verify that i2c/c2i adapters are called properly")               \
1149                                                                             \
1150   develop(bool, VerifyAdapterSharing, false,                                \
1151           "Verify that the code for shared adapters is the equivalent")     \
1152                                                                             \
1153   diagnostic(bool, PrintAssembly, false,                                    \
1154           "Print assembly code (using external disassembler.so)")           \
1155                                                                             \
1156   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1157           "Print options string passed to disassembler.so")                 \
1158                                                                             \
1159   notproduct(bool, PrintNMethodStatistics, false,                           \
1160           "Print a summary statistic for the generated nmethods")           \
1161                                                                             \
1162   diagnostic(bool, PrintNMethods, false,                                    \
1163           "Print assembly code for nmethods when generated")                \
1164                                                                             \
1165   diagnostic(bool, PrintNativeNMethods, false,                              \
1166           "Print assembly code for native nmethods when generated")         \
1167                                                                             \
1168   develop(bool, PrintDebugInfo, false,                                      \
1169           "Print debug information for all nmethods when generated")        \
1170                                                                             \
1171   develop(bool, PrintRelocations, false,                                    \
1172           "Print relocation information for all nmethods when generated")   \
1173                                                                             \
1174   develop(bool, PrintDependencies, false,                                   \
1175           "Print dependency information for all nmethods when generated")   \
1176                                                                             \
1177   develop(bool, PrintExceptionHandlers, false,                              \
1178           "Print exception handler tables for all nmethods when generated") \
1179                                                                             \
1180   develop(bool, StressCompiledExceptionHandlers, false,                     \
1181           "Exercise compiled exception handlers")                           \
1182                                                                             \
1183   develop(bool, InterceptOSException, false,                                \
1184           "Start debugger when an implicit OS (e.g. NULL) "                 \
1185           "exception happens")                                              \
1186                                                                             \
1187   product(bool, PrintCodeCache, false,                                      \
1188           "Print the code cache memory usage when exiting")                 \
1189                                                                             \
1190   develop(bool, PrintCodeCache2, false,                                     \
1191           "Print detailed usage information on the code cache when exiting")\
1192                                                                             \
1193   product(bool, PrintCodeCacheOnCompilation, false,                         \
1194           "Print the code cache memory usage each time a method is "        \
1195           "compiled")                                                       \
1196                                                                             \
1197   diagnostic(bool, PrintStubCode, false,                                    \
1198           "Print generated stub code")                                      \
1199                                                                             \
1200   product(bool, StackTraceInThrowable, true,                                \
1201           "Collect backtrace in throwable when exception happens")          \
1202                                                                             \
1203   product(bool, OmitStackTraceInFastThrow, true,                            \
1204           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1205                                                                             \
1206   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1207           "Print bytecode statistics when dumping profiler output")         \
1208                                                                             \
1209   product(bool, ProfilerRecordPC, false,                                    \
1210           "Collect ticks for each 16 byte interval of compiled code")       \
1211                                                                             \
1212   product(bool, ProfileVM, false,                                           \
1213           "Profile ticks that fall within VM (either in the VM Thread "     \
1214           "or VM code called through stubs)")                               \
1215                                                                             \
1216   product(bool, ProfileIntervals, false,                                    \
1217           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1218                                                                             \
1219   notproduct(bool, ProfilerCheckIntervals, false,                           \
1220           "Collect and print information on spacing of profiler ticks")     \
1221                                                                             \
1222   product(bool, PrintWarnings, true,                                        \
1223           "Print JVM warnings to output stream")                            \
1224                                                                             \
1225   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1226           "Print warnings for stalled SpinLocks")                           \
1227                                                                             \
1228   product(bool, RegisterFinalizersAtInit, true,                             \
1229           "Register finalizable objects at end of Object.<init> or "        \
1230           "after allocation")                                               \
1231                                                                             \
1232   develop(bool, RegisterReferences, true,                                   \
1233           "Tell whether the VM should register soft/weak/final/phantom "    \
1234           "references")                                                     \
1235                                                                             \
1236   develop(bool, IgnoreRewrites, false,                                      \
1237           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1238           "This is unsafe!")                                                \
1239                                                                             \
1240   develop(bool, PrintCodeCacheExtension, false,                             \
1241           "Print extension of code cache")                                  \
1242                                                                             \
1243   develop(bool, UsePrivilegedStack, true,                                   \
1244           "Enable the security JVM functions")                              \
1245                                                                             \
1246   develop(bool, ProtectionDomainVerification, true,                         \
1247           "Verify protection domain before resolution in system dictionary")\
1248                                                                             \
1249   product(bool, ClassUnloading, true,                                       \
1250           "Do unloading of classes")                                        \
1251                                                                             \
1252   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1253           "Do unloading of classes with a concurrent marking cycle")        \
1254                                                                             \
1255   develop(bool, DisableStartThread, false,                                  \
1256           "Disable starting of additional Java threads "                    \
1257           "(for debugging only)")                                           \
1258                                                                             \
1259   develop(bool, MemProfiling, false,                                        \
1260           "Write memory usage profiling to log file")                       \
1261                                                                             \
1262   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1263           "Print the system dictionary at exit")                            \
1264                                                                             \
1265   experimental(intx, PredictedLoadedClassCount, 0,                          \
1266           "Experimental: Tune loaded class cache starting size")            \
1267                                                                             \
1268   diagnostic(bool, UnsyncloadClass, false,                                  \
1269           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1270           "class loader must call VM synchronized for findClass "           \
1271           "and defineClass.")                                               \
1272                                                                             \
1273   product(bool, AlwaysLockClassLoader, false,                               \
1274           "Require the VM to acquire the class loader lock before calling " \
1275           "loadClass() even for class loaders registering "                 \
1276           "as parallel capable")                                            \
1277                                                                             \
1278   product(bool, AllowParallelDefineClass, false,                            \
1279           "Allow parallel defineClass requests for class loaders "          \
1280           "registering as parallel capable")                                \
1281                                                                             \
1282   product(bool, MustCallLoadClassInternal, false,                           \
1283           "Call loadClassInternal() rather than loadClass()")               \
1284                                                                             \
1285   product_pd(bool, DontYieldALot,                                           \
1286           "Throw away obvious excess yield calls")                          \
1287                                                                             \
1288   product(bool, ConvertSleepToYield, true,                                  \
1289           "Convert sleep(0) to thread yield ")                              \
1290                                                                             \
1291   product(bool, ConvertYieldToSleep, false,                                 \
1292           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1293           "behavior")                                                       \
1294                                                                             \
1295   develop(bool, UseDetachedThreads, true,                                   \
1296           "Use detached threads that are recycled upon termination "        \
1297           "(for Solaris only)")                                             \
1298                                                                             \
1299   product(bool, UseLWPSynchronization, true,                                \
1300           "Use LWP-based instead of libthread-based synchronization "       \
1301           "(SPARC only)")                                                   \
1302                                                                             \
1303   experimental(ccstr, SyncKnobs, NULL,                                      \
1304                "(Unstable) Various monitor synchronization tunables")       \
1305                                                                             \
1306   experimental(intx, EmitSync, 0,                                           \
1307                "(Unsafe, Unstable) "                                        \
1308                "Control emission of inline sync fast-path code")            \
1309                                                                             \
1310   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1311           range(0, max_jint)                                                \
1312                                                                             \
1313   product(bool, MonitorInUseLists, true, "Track Monitors for Deflation")    \
1314                                                                             \
1315   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1316                "Experimental Sync flags")                                   \
1317                                                                             \
1318   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1319                                                                             \
1320   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1321                                                                             \
1322   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1323                                                                             \
1324   experimental(intx, hashCode, 5,                                           \
1325                "(Unstable) select hashCode generation algorithm")           \
1326                                                                             \
1327   product(bool, FilterSpuriousWakeups, true,                                \
1328           "When true prevents OS-level spurious, or premature, wakeups "    \
1329           "from Object.wait (Ignored for Windows)")                         \
1330                                                                             \
1331   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1332                                                                             \
1333   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1334                                                                             \
1335   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1336                                                                             \
1337   develop(bool, UsePthreads, false,                                         \
1338           "Use pthread-based instead of libthread-based synchronization "   \
1339           "(SPARC only)")                                                   \
1340                                                                             \
1341   product(bool, ReduceSignalUsage, false,                                   \
1342           "Reduce the use of OS signals in Java and/or the VM")             \
1343                                                                             \
1344   develop_pd(bool, ShareVtableStubs,                                        \
1345           "Share vtable stubs (smaller code but worse branch prediction")   \
1346                                                                             \
1347   develop(bool, LoadLineNumberTables, true,                                 \
1348           "Tell whether the class file parser loads line number tables")    \
1349                                                                             \
1350   develop(bool, LoadLocalVariableTables, true,                              \
1351           "Tell whether the class file parser loads local variable tables") \
1352                                                                             \
1353   develop(bool, LoadLocalVariableTypeTables, true,                          \
1354           "Tell whether the class file parser loads local variable type"    \
1355           "tables")                                                         \
1356                                                                             \
1357   product(bool, AllowUserSignalHandlers, false,                             \
1358           "Do not complain if the application installs signal handlers "    \
1359           "(Solaris & Linux only)")                                         \
1360                                                                             \
1361   product(bool, UseSignalChaining, true,                                    \
1362           "Use signal-chaining to invoke signal handlers installed "        \
1363           "by the application (Solaris & Linux only)")                      \
1364                                                                             \
1365   product(bool, AllowJNIEnvProxy, false,                                    \
1366           "Allow JNIEnv proxies for jdbx")                                  \
1367                                                                             \
1368   product(bool, RestoreMXCSROnJNICalls, false,                              \
1369           "Restore MXCSR when returning from JNI calls")                    \
1370                                                                             \
1371   product(bool, CheckJNICalls, false,                                       \
1372           "Verify all arguments to JNI calls")                              \
1373                                                                             \
1374   product(bool, CheckEndorsedAndExtDirs, false,                             \
1375           "Verify the endorsed and extension directories are not used")     \
1376                                                                             \
1377   product(bool, UseFastJNIAccessors, true,                                  \
1378           "Use optimized versions of Get<Primitive>Field")                  \
1379                                                                             \
1380   product(intx, MaxJNILocalCapacity, 65536,                                 \
1381           "Maximum allowable local JNI handle capacity to "                 \
1382           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1383           "where <= 0 is unlimited, default: 65536")                        \
1384           range(min_intx, max_intx)                                         \
1385                                                                             \
1386   product(bool, EagerXrunInit, false,                                       \
1387           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1388           "but not all -Xrun libraries may support the state of the VM "    \
1389           "at this time")                                                   \
1390                                                                             \
1391   product(bool, PreserveAllAnnotations, false,                              \
1392           "Preserve RuntimeInvisibleAnnotations as well "                   \
1393           "as RuntimeVisibleAnnotations")                                   \
1394                                                                             \
1395   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1396           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1397                                                                             \
1398   product(bool, UseXMMForArrayCopy, false,                                  \
1399           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1400                                                                             \
1401   product(intx, FieldsAllocationStyle, 1,                                   \
1402           "0 - type based with oops first, "                                \
1403           "1 - with oops last, "                                            \
1404           "2 - oops in super and sub classes are together")                 \
1405           range(0, 2)                                                       \
1406                                                                             \
1407   product(bool, CompactFields, true,                                        \
1408           "Allocate nonstatic fields in gaps between previous fields")      \
1409                                                                             \
1410   notproduct(bool, PrintFieldLayout, false,                                 \
1411           "Print field layout for each class")                              \
1412                                                                             \
1413   /* Need to limit the extent of the padding to reasonable size.          */\
1414   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1415   /* aggressive prefetching, while still leaving the room for segregating */\
1416   /* among the distinct pages.                                            */\
1417   product(intx, ContendedPaddingWidth, 128,                                 \
1418           "How many bytes to pad the fields/classes marked @Contended with")\
1419           range(0, 8192)                                                    \
1420           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1421                                                                             \
1422   product(bool, EnableContended, true,                                      \
1423           "Enable @Contended annotation support")                           \
1424                                                                             \
1425   product(bool, RestrictContended, true,                                    \
1426           "Restrict @Contended to trusted classes")                         \
1427                                                                             \
1428   product(bool, UseBiasedLocking, true,                                     \
1429           "Enable biased locking in JVM")                                   \
1430                                                                             \
1431   product(intx, BiasedLockingStartupDelay, 4000,                            \
1432           "Number of milliseconds to wait before enabling biased locking")  \
1433           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1434           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1435                                                                             \
1436   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1437           "Print statistics of biased locking in JVM")                      \
1438                                                                             \
1439   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1440           "Threshold of number of revocations per type to try to "          \
1441           "rebias all objects in the heap of that type")                    \
1442           range(0, max_intx)                                                \
1443           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1444                                                                             \
1445   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1446           "Threshold of number of revocations per type to permanently "     \
1447           "revoke biases of all objects in the heap of that type")          \
1448           range(0, max_intx)                                                \
1449           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1450                                                                             \
1451   product(intx, BiasedLockingDecayTime, 25000,                              \
1452           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1453           "type after previous bulk rebias")                                \
1454           range(500, max_intx)                                              \
1455           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1456                                                                             \
1457   product(bool, ExitOnOutOfMemoryError, false,                              \
1458           "JVM exits on the first occurrence of an out-of-memory error")    \
1459                                                                             \
1460   product(bool, CrashOnOutOfMemoryError, false,                             \
1461           "JVM aborts, producing an error log and core/mini dump, on the "  \
1462           "first occurrence of an out-of-memory error")                     \
1463                                                                             \
1464   /* tracing */                                                             \
1465                                                                             \
1466   develop(bool, StressRewriter, false,                                      \
1467           "Stress linktime bytecode rewriting")                             \
1468                                                                             \
1469   product(ccstr, TraceJVMTI, NULL,                                          \
1470           "Trace flags for JVMTI functions and events")                     \
1471                                                                             \
1472   /* This option can change an EMCP method into an obsolete method. */      \
1473   /* This can affect tests that except specific methods to be EMCP. */      \
1474   /* This option should be used with caution.                       */      \
1475   product(bool, StressLdcRewrite, false,                                    \
1476           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1477                                                                             \
1478   /* change to false by default sometime after Mustang */                   \
1479   product(bool, VerifyMergedCPBytecodes, true,                              \
1480           "Verify bytecodes after RedefineClasses constant pool merging")   \
1481                                                                             \
1482   develop(bool, TraceBytecodes, false,                                      \
1483           "Trace bytecode execution")                                       \
1484                                                                             \
1485   develop(bool, TraceICs, false,                                            \
1486           "Trace inline cache changes")                                     \
1487                                                                             \
1488   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1489           "Trace method invocation counter overflow")                       \
1490                                                                             \
1491   develop(bool, TraceInlineCacheClearing, false,                            \
1492           "Trace clearing of inline caches in nmethods")                    \
1493                                                                             \
1494   develop(bool, TraceDependencies, false,                                   \
1495           "Trace dependencies")                                             \
1496                                                                             \
1497   develop(bool, VerifyDependencies, trueInDebug,                            \
1498           "Exercise and verify the compilation dependency mechanism")       \
1499                                                                             \
1500   develop(bool, TraceNewOopMapGeneration, false,                            \
1501           "Trace OopMapGeneration")                                         \
1502                                                                             \
1503   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1504           "Trace OopMapGeneration: print detailed cell states")             \
1505                                                                             \
1506   develop(bool, TimeOopMap, false,                                          \
1507           "Time calls to GenerateOopMap::compute_map() in sum")             \
1508                                                                             \
1509   develop(bool, TimeOopMap2, false,                                         \
1510           "Time calls to GenerateOopMap::compute_map() individually")       \
1511                                                                             \
1512   develop(bool, TraceOopMapRewrites, false,                                 \
1513           "Trace rewriting of method oops during oop map generation")       \
1514                                                                             \
1515   develop(bool, TraceICBuffer, false,                                       \
1516           "Trace usage of IC buffer")                                       \
1517                                                                             \
1518   develop(bool, TraceCompiledIC, false,                                     \
1519           "Trace changes of compiled IC")                                   \
1520                                                                             \
1521   /* gc */                                                                  \
1522                                                                             \
1523   product(bool, UseSerialGC, false,                                         \
1524           "Use the Serial garbage collector")                               \
1525                                                                             \
1526   product(bool, UseG1GC, false,                                             \
1527           "Use the Garbage-First garbage collector")                        \
1528                                                                             \
1529   product(bool, UseParallelGC, false,                                       \
1530           "Use the Parallel Scavenge garbage collector")                    \
1531                                                                             \
1532   product(bool, UseParallelOldGC, false,                                    \
1533           "Use the Parallel Old garbage collector")                         \
1534                                                                             \
1535   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1536           "How often should we maximally compact the heap (not allowing "   \
1537           "any dead space)")                                                \
1538           range(0, max_uintx)                                               \
1539                                                                             \
1540   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1541           "The collection count for the first maximum compaction")          \
1542           range(0, max_uintx)                                               \
1543                                                                             \
1544   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1545           "Use maximum compaction in the Parallel Old garbage collector "   \
1546           "for a system GC")                                                \
1547                                                                             \
1548   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1549           "The mean used by the parallel compact dead wood "                \
1550           "limiter (a number between 0-100)")                               \
1551           range(0, 100)                                                     \
1552                                                                             \
1553   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1554           "The standard deviation used by the parallel compact dead wood "  \
1555           "limiter (a number between 0-100)")                               \
1556           range(0, 100)                                                     \
1557                                                                             \
1558   product(uint, ParallelGCThreads, 0,                                       \
1559           "Number of parallel threads parallel gc will use")                \
1560           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1561                                                                             \
1562   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1563             "Use semaphore synchronization for the GC Threads, "            \
1564             "instead of synchronization based on mutexes")                  \
1565                                                                             \
1566   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1567           "Dynamically choose the number of parallel threads "              \
1568           "parallel gc will use")                                           \
1569                                                                             \
1570   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1571           "Force dynamic selection of the number of "                       \
1572           "parallel threads parallel gc will use to aid debugging")         \
1573                                                                             \
1574   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1575           "Size of heap (bytes) per GC thread used in calculating the "     \
1576           "number of GC threads")                                           \
1577           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1578                                                                             \
1579   product(uint, ConcGCThreads, 0,                                           \
1580           "Number of threads concurrent gc will use")                       \
1581           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1582                                                                             \
1583   product(uintx, GCTaskTimeStampEntries, 200,                               \
1584           "Number of time stamp entries per gc worker thread")              \
1585           range(1, max_uintx)                                               \
1586                                                                             \
1587   product(bool, AlwaysTenure, false,                                        \
1588           "Always tenure objects in eden (ParallelGC only)")                \
1589                                                                             \
1590   product(bool, NeverTenure, false,                                         \
1591           "Never tenure objects in eden, may tenure on overflow "           \
1592           "(ParallelGC only)")                                              \
1593                                                                             \
1594   product(bool, ScavengeBeforeFullGC, true,                                 \
1595           "Scavenge youngest generation before each full GC.")              \
1596                                                                             \
1597   product(bool, UseConcMarkSweepGC, false,                                  \
1598           "Use Concurrent Mark-Sweep GC in the old generation")             \
1599                                                                             \
1600   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1601           "A System.gc() request invokes a concurrent collection; "         \
1602           "(effective only when using concurrent collectors)")              \
1603                                                                             \
1604   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1605           "A System.gc() request invokes a concurrent collection and "      \
1606           "also unloads classes during such a concurrent gc cycle "         \
1607           "(effective only when UseConcMarkSweepGC)")                       \
1608                                                                             \
1609   product(bool, GCLockerInvokesConcurrent, false,                           \
1610           "The exit of a JNI critical section necessitating a scavenge, "   \
1611           "also kicks off a background concurrent collection")              \
1612                                                                             \
1613   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1614           "How much the GC can expand the eden by while the GC locker "     \
1615           "is active (as a percentage)")                                    \
1616           range(0, 100)                                                     \
1617                                                                             \
1618   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1619           "Number of times to retry allocations when "                      \
1620           "blocked by the GC locker")                                       \
1621           range(0, max_uintx)                                               \
1622                                                                             \
1623   product(bool, UseCMSBestFit, true,                                        \
1624           "Use CMS best fit allocation strategy")                           \
1625                                                                             \
1626   product(bool, UseParNewGC, false,                                         \
1627           "Use parallel threads in the new generation")                     \
1628                                                                             \
1629   product(uintx, ParallelGCBufferWastePct, 10,                              \
1630           "Wasted fraction of parallel allocation buffer")                  \
1631           range(0, 100)                                                     \
1632                                                                             \
1633   product(uintx, TargetPLABWastePct, 10,                                    \
1634           "Target wasted space in last buffer as percent of overall "       \
1635           "allocation")                                                     \
1636           range(1, 100)                                                     \
1637                                                                             \
1638   product(uintx, PLABWeight, 75,                                            \
1639           "Percentage (0-100) used to weight the current sample when "      \
1640           "computing exponentially decaying average for ResizePLAB")        \
1641           range(0, 100)                                                     \
1642                                                                             \
1643   product(bool, ResizePLAB, true,                                           \
1644           "Dynamically resize (survivor space) promotion LAB's")            \
1645                                                                             \
1646   product(int, ParGCArrayScanChunk, 50,                                     \
1647           "Scan a subset of object array and push remainder, if array is "  \
1648           "bigger than this")                                               \
1649           range(1, max_jint/3)                                              \
1650                                                                             \
1651   product(bool, ParGCUseLocalOverflow, false,                               \
1652           "Instead of a global overflow list, use local overflow stacks")   \
1653                                                                             \
1654   product(bool, ParGCTrimOverflow, true,                                    \
1655           "Eagerly trim the local overflow lists "                          \
1656           "(when ParGCUseLocalOverflow)")                                   \
1657                                                                             \
1658   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1659           "Simulate work queue overflow in ParNew")                         \
1660                                                                             \
1661   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1662           "An `interval' counter that determines how frequently "           \
1663           "we simulate overflow; a smaller number increases frequency")     \
1664                                                                             \
1665   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1666           "The desired number of objects to claim from the overflow list")  \
1667           range(0, max_uintx)                                               \
1668                                                                             \
1669   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1670           "The number of strides per worker thread that we divide up the "  \
1671           "card table scanning work into")                                  \
1672           range(1, max_uintx)                                               \
1673           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1674                                                                             \
1675   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1676           "The number of cards in each chunk of the parallel chunks used "  \
1677           "during card table scanning")                                     \
1678           range(1, max_intx)                                                \
1679           constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\
1680                                                                             \
1681   product(uintx, OldPLABWeight, 50,                                         \
1682           "Percentage (0-100) used to weight the current sample when "      \
1683           "computing exponentially decaying average for resizing "          \
1684           "OldPLABSize")                                                    \
1685           range(0, 100)                                                     \
1686                                                                             \
1687   product(bool, ResizeOldPLAB, true,                                        \
1688           "Dynamically resize (old gen) promotion LAB's")                   \
1689                                                                             \
1690   product(size_t, CMSOldPLABMax, 1024,                                      \
1691           "Maximum size of CMS gen promotion LAB caches per worker "        \
1692           "per block size")                                                 \
1693           range(1, max_uintx)                                               \
1694           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1695                                                                             \
1696   product(size_t, CMSOldPLABMin, 16,                                        \
1697           "Minimum size of CMS gen promotion LAB caches per worker "        \
1698           "per block size")                                                 \
1699           range(1, max_uintx)                                               \
1700           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1701                                                                             \
1702   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1703           "Nominal number of refills of CMS gen promotion LAB cache "       \
1704           "per worker per block size")                                      \
1705           range(1, max_uintx)                                               \
1706                                                                             \
1707   product(bool, CMSOldPLABResizeQuicker, false,                             \
1708           "React on-the-fly during a scavenge to a sudden "                 \
1709           "change in block demand rate")                                    \
1710                                                                             \
1711   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1712           "The tolerance of the phase-change detector for on-the-fly "      \
1713           "PLAB resizing during a scavenge")                                \
1714           range(1, max_uintx)                                               \
1715                                                                             \
1716   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1717           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1718           "during a scavenge")                                              \
1719           range(1, max_uintx)                                               \
1720                                                                             \
1721   product(bool, AlwaysPreTouch, false,                                      \
1722           "Force all freshly committed pages to be pre-touched")            \
1723                                                                             \
1724   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1725           "The maximum size of young gen chosen by default per GC worker "  \
1726           "thread available")                                               \
1727           range(1, max_uintx)                                               \
1728                                                                             \
1729   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1730           "Percentage (0-100) used to add conservatism when computing the " \
1731           "duty cycle")                                                     \
1732           range(0, 100)                                                     \
1733                                                                             \
1734   product(uintx, CMSExpAvgFactor, 50,                                       \
1735           "Percentage (0-100) used to weight the current sample when "      \
1736           "computing exponential averages for CMS statistics")              \
1737           range(0, 100)                                                     \
1738                                                                             \
1739   product(uintx, CMS_FLSWeight, 75,                                         \
1740           "Percentage (0-100) used to weight the current sample when "      \
1741           "computing exponentially decaying averages for CMS FLS "          \
1742           "statistics")                                                     \
1743           range(0, 100)                                                     \
1744                                                                             \
1745   product(uintx, CMS_FLSPadding, 1,                                         \
1746           "The multiple of deviation from mean to use for buffering "       \
1747           "against volatility in free list demand")                         \
1748           range(0, max_juint)                                               \
1749                                                                             \
1750   product(uintx, FLSCoalescePolicy, 2,                                      \
1751           "CMS: aggressiveness level for coalescing, increasing "           \
1752           "from 0 to 4")                                                    \
1753           range(0, 4)                                                       \
1754                                                                             \
1755   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1756           "CMS: larger free blocks are always available for coalescing")    \
1757                                                                             \
1758   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1759           "CMS: the smaller the percentage the greater the coalescing "     \
1760           "force")                                                          \
1761           range(0.0, 1.0)                                                   \
1762                                                                             \
1763   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1764           "CMS: the factor by which to inflate estimated demand of small "  \
1765           "block sizes to prevent coalescing with an adjoining block")      \
1766           range(0.0, DBL_MAX)                                               \
1767                                                                             \
1768   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1769           "CMS: the factor by which to inflate estimated demand of large "  \
1770           "block sizes to prevent coalescing with an adjoining block")      \
1771           range(0.0, DBL_MAX)                                               \
1772                                                                             \
1773   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1774           "CMS: the factor by which to inflate estimated demand of small "  \
1775           "block sizes to prevent splitting to supply demand for smaller "  \
1776           "blocks")                                                         \
1777           range(0.0, DBL_MAX)                                               \
1778                                                                             \
1779   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1780           "CMS: the factor by which to inflate estimated demand of large "  \
1781           "block sizes to prevent splitting to supply demand for smaller "  \
1782           "blocks")                                                         \
1783           range(0.0, DBL_MAX)                                               \
1784                                                                             \
1785   product(bool, CMSExtrapolateSweep, false,                                 \
1786           "CMS: cushion for block demand during sweep")                     \
1787                                                                             \
1788   product(uintx, CMS_SweepWeight, 75,                                       \
1789           "Percentage (0-100) used to weight the current sample when "      \
1790           "computing exponentially decaying average for inter-sweep "       \
1791           "duration")                                                       \
1792           range(0, 100)                                                     \
1793                                                                             \
1794   product(uintx, CMS_SweepPadding, 1,                                       \
1795           "The multiple of deviation from mean to use for buffering "       \
1796           "against volatility in inter-sweep duration")                     \
1797           range(0, max_juint)                                               \
1798                                                                             \
1799   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1800           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1801           "duration exceeds this threshold in milliseconds")                \
1802           range(0, max_uintx)                                               \
1803                                                                             \
1804   product(bool, CMSClassUnloadingEnabled, true,                             \
1805           "Whether class unloading enabled when using CMS GC")              \
1806                                                                             \
1807   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1808           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1809           "count for which classes may not be unloaded")                    \
1810           range(0, max_uintx)                                               \
1811                                                                             \
1812   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1813           "Replenish an indexed free list with this number of chunks")      \
1814           range(1, max_uintx)                                               \
1815                                                                             \
1816   product(bool, CMSReplenishIntermediate, true,                             \
1817           "Replenish all intermediate free-list caches")                    \
1818                                                                             \
1819   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1820           "When satisfying batched demand, split blocks from the "          \
1821           "IndexedFreeList whose size is a multiple of requested size")     \
1822                                                                             \
1823   product(bool, CMSLoopWarn, false,                                         \
1824           "Warn in case of excessive CMS looping")                          \
1825                                                                             \
1826   /* where does the range max value of (max_jint - 1) come from? */         \
1827   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1828           "Maximum size of marking stack")                                  \
1829           range(1, (max_jint - 1))                                          \
1830                                                                             \
1831   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1832           "Size of marking stack")                                          \
1833           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1834                                                                             \
1835   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1836           "Simulate frequent marking stack / work queue overflow")          \
1837                                                                             \
1838   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1839           "An \"interval\" counter that determines how frequently "         \
1840           "to simulate overflow; a smaller number increases frequency")     \
1841                                                                             \
1842   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1843           "Maximum number of abortable preclean iterations, if > 0")        \
1844           range(0, max_uintx)                                               \
1845                                                                             \
1846   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1847           "Maximum time in abortable preclean (in milliseconds)")           \
1848           range(0, max_intx)                                                \
1849                                                                             \
1850   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1851           "Nominal minimum work per abortable preclean iteration")          \
1852           range(0, max_uintx)                                               \
1853                                                                             \
1854   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1855           "Time that we sleep between iterations when not given "           \
1856           "enough work per iteration")                                      \
1857           range(0, max_intx)                                                \
1858                                                                             \
1859   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1860   product(size_t, CMSRescanMultiple, 32,                                    \
1861           "Size (in cards) of CMS parallel rescan task")                    \
1862           range(1, SIZE_MAX / 4096)                                         \
1863           constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit)       \
1864                                                                             \
1865   /* 4096 = CardTableModRefBS::card_size_in_words * BitsPerWord */          \
1866   product(size_t, CMSConcMarkMultiple, 32,                                  \
1867           "Size (in cards) of CMS concurrent MT marking task")              \
1868           range(1, SIZE_MAX / 4096)                                         \
1869           constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit)     \
1870                                                                             \
1871   product(bool, CMSAbortSemantics, false,                                   \
1872           "Whether abort-on-overflow semantics is implemented")             \
1873                                                                             \
1874   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1875           "Use the parallel initial mark.")                                 \
1876                                                                             \
1877   product(bool, CMSParallelRemarkEnabled, true,                             \
1878           "Whether parallel remark enabled (only if ParNewGC)")             \
1879                                                                             \
1880   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1881           "Whether parallel remark of survivor space "                      \
1882           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1883                                                                             \
1884   product(bool, CMSPLABRecordAlways, true,                                  \
1885           "Always record survivor space PLAB boundaries (effective only "   \
1886           "if CMSParallelSurvivorRemarkEnabled)")                           \
1887                                                                             \
1888   product(bool, CMSEdenChunksRecordAlways, true,                            \
1889           "Always record eden chunks used for the parallel initial mark "   \
1890           "or remark of eden")                                              \
1891                                                                             \
1892   product(bool, CMSConcurrentMTEnabled, true,                               \
1893           "Whether multi-threaded concurrent work enabled "                 \
1894           "(effective only if ParNewGC)")                                   \
1895                                                                             \
1896   product(bool, CMSPrecleaningEnabled, true,                                \
1897           "Whether concurrent precleaning enabled")                         \
1898                                                                             \
1899   product(uintx, CMSPrecleanIter, 3,                                        \
1900           "Maximum number of precleaning iteration passes")                 \
1901           range(0, 9)                                                       \
1902                                                                             \
1903   product(uintx, CMSPrecleanDenominator, 3,                                 \
1904           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1905           "ratio")                                                          \
1906           range(1, max_uintx)                                               \
1907           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1908                                                                             \
1909   product(uintx, CMSPrecleanNumerator, 2,                                   \
1910           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1911           "ratio")                                                          \
1912           range(0, max_uintx-1)                                             \
1913           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1914                                                                             \
1915   product(bool, CMSPrecleanRefLists1, true,                                 \
1916           "Preclean ref lists during (initial) preclean phase")             \
1917                                                                             \
1918   product(bool, CMSPrecleanRefLists2, false,                                \
1919           "Preclean ref lists during abortable preclean phase")             \
1920                                                                             \
1921   product(bool, CMSPrecleanSurvivors1, false,                               \
1922           "Preclean survivors during (initial) preclean phase")             \
1923                                                                             \
1924   product(bool, CMSPrecleanSurvivors2, true,                                \
1925           "Preclean survivors during abortable preclean phase")             \
1926                                                                             \
1927   product(uintx, CMSPrecleanThreshold, 1000,                                \
1928           "Do not iterate again if number of dirty cards is less than this")\
1929           range(100, max_uintx)                                             \
1930                                                                             \
1931   product(bool, CMSCleanOnEnter, true,                                      \
1932           "Clean-on-enter optimization for reducing number of dirty cards") \
1933                                                                             \
1934   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1935           "Choose variant (1,2) of verification following remark")          \
1936           range(1, 2)                                                       \
1937                                                                             \
1938   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1939           "If Eden size is below this, do not try to schedule remark")      \
1940           range(0, max_uintx)                                               \
1941                                                                             \
1942   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1943           "The Eden occupancy percentage (0-100) at which "                 \
1944           "to try and schedule remark pause")                               \
1945           range(0, 100)                                                     \
1946                                                                             \
1947   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1948           "Start sampling eden top at least before young gen "              \
1949           "occupancy reaches 1/<ratio> of the size at which "               \
1950           "we plan to schedule remark")                                     \
1951           range(1, max_uintx)                                               \
1952                                                                             \
1953   product(uintx, CMSSamplingGrain, 16*K,                                    \
1954           "The minimum distance between eden samples for CMS (see above)")  \
1955           range(ObjectAlignmentInBytes, max_uintx)                          \
1956           constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit)        \
1957                                                                             \
1958   product(bool, CMSScavengeBeforeRemark, false,                             \
1959           "Attempt scavenge before the CMS remark step")                    \
1960                                                                             \
1961   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1962           "Don't drain below this size per parallel worker/thief")          \
1963           range(1, max_juint)                                               \
1964           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1965                                                                             \
1966   manageable(intx, CMSWaitDuration, 2000,                                   \
1967           "Time in milliseconds that CMS thread waits for young GC")        \
1968           range(min_jint, max_jint)                                         \
1969                                                                             \
1970   develop(uintx, CMSCheckInterval, 1000,                                    \
1971           "Interval in milliseconds that CMS thread checks if it "          \
1972           "should start a collection cycle")                                \
1973                                                                             \
1974   product(bool, CMSYield, true,                                             \
1975           "Yield between steps of CMS")                                     \
1976                                                                             \
1977   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1978           "Bitmap operations should process at most this many bits "        \
1979           "between yields")                                                 \
1980           range(1, max_uintx)                                               \
1981           constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit)   \
1982                                                                             \
1983   product(bool, CMSPrintChunksInDump, false,                                \
1984           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1985           "trace level include more detailed information about the"         \
1986           "free chunks")                \
1987                                                                             \
1988   product(bool, CMSPrintObjectsInDump, false,                               \
1989           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1990           "trace level include more detailed information about the"         \
1991           "allocated objects")                                              \
1992                                                                             \
1993   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1994           "Verify that all references across the FLS boundary "             \
1995           "are to valid objects")                                           \
1996                                                                             \
1997   diagnostic(bool, FLSVerifyLists, false,                                   \
1998           "Do lots of (expensive) FreeListSpace verification")              \
1999                                                                             \
2000   diagnostic(bool, FLSVerifyIndexTable, false,                              \
2001           "Do lots of (expensive) FLS index table verification")            \
2002                                                                             \
2003   develop(bool, FLSVerifyDictionary, false,                                 \
2004           "Do lots of (expensive) FLS dictionary verification")             \
2005                                                                             \
2006   develop(bool, VerifyBlockOffsetArray, false,                              \
2007           "Do (expensive) block offset array verification")                 \
2008                                                                             \
2009   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
2010           "Maintain _unallocated_block in BlockOffsetArray "                \
2011           "(currently applicable only to CMS collector)")                   \
2012                                                                             \
2013   product(intx, RefDiscoveryPolicy, 0,                                      \
2014           "Select type of reference discovery policy: "                     \
2015           "reference-based(0) or referent-based(1)")                        \
2016           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
2017                 ReferenceProcessor::DiscoveryPolicyMax)                     \
2018                                                                             \
2019   product(bool, ParallelRefProcEnabled, false,                              \
2020           "Enable parallel reference processing whenever possible")         \
2021                                                                             \
2022   product(bool, ParallelRefProcBalancingEnabled, true,                      \
2023           "Enable balancing of reference processing queues")                \
2024                                                                             \
2025   product(uintx, CMSTriggerRatio, 80,                                       \
2026           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
2027           "allocated before a CMS collection cycle commences")              \
2028           range(0, 100)                                                     \
2029                                                                             \
2030   product(uintx, CMSBootstrapOccupancy, 50,                                 \
2031           "Percentage CMS generation occupancy at which to "                \
2032           "initiate CMS collection for bootstrapping collection stats")     \
2033           range(0, 100)                                                     \
2034                                                                             \
2035   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
2036           "Percentage CMS generation occupancy to start a CMS collection "  \
2037           "cycle. A negative value means that CMSTriggerRatio is used")     \
2038           range(min_intx, 100)                                              \
2039                                                                             \
2040   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
2041           "The percent occupancy (IHOP) of the current old generation "     \
2042           "capacity above which a concurrent mark cycle will be initiated " \
2043           "Its value may change over time if adaptive IHOP is enabled, "    \
2044           "otherwise the value remains constant. "                          \
2045           "In the latter case a value of 0 will result as frequent as "     \
2046           "possible concurrent marking cycles. A value of 100 disables "    \
2047           "concurrent marking. "                                            \
2048           "Fragmentation waste in the old generation is not considered "    \
2049           "free space in this calculation. (G1 collector only)")            \
2050           range(0, 100)                                                     \
2051                                                                             \
2052   manageable(intx, CMSTriggerInterval, -1,                                  \
2053           "Commence a CMS collection cycle (at least) every so many "       \
2054           "milliseconds (0 permanently, -1 disabled)")                      \
2055           range(-1, max_intx)                                               \
2056                                                                             \
2057   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
2058           "Only use occupancy as a criterion for starting a CMS collection")\
2059                                                                             \
2060   product(uintx, CMSIsTooFullPercentage, 98,                                \
2061           "An absolute ceiling above which CMS will always consider the "   \
2062           "unloading of classes when class unloading is enabled")           \
2063           range(0, 100)                                                     \
2064                                                                             \
2065   develop(bool, CMSTestInFreeList, false,                                   \
2066           "Check if the coalesced range is already in the "                 \
2067           "free lists as claimed")                                          \
2068                                                                             \
2069   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
2070           "Check that all the garbage collected was returned to the "       \
2071           "free lists")                                                     \
2072                                                                             \
2073   notproduct(bool, ScavengeALot, false,                                     \
2074           "Force scavenge at every Nth exit from the runtime system "       \
2075           "(N=ScavengeALotInterval)")                                       \
2076                                                                             \
2077   develop(bool, FullGCALot, false,                                          \
2078           "Force full gc at every Nth exit from the runtime system "        \
2079           "(N=FullGCALotInterval)")                                         \
2080                                                                             \
2081   notproduct(bool, GCALotAtAllSafepoints, false,                            \
2082           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
2083                                                                             \
2084   notproduct(bool, PromotionFailureALot, false,                             \
2085           "Use promotion failure handling on every youngest generation "    \
2086           "collection")                                                     \
2087                                                                             \
2088   develop(uintx, PromotionFailureALotCount, 1000,                           \
2089           "Number of promotion failures occurring at PLAB "                 \
2090           "refill attempts (ParNew) or promotion attempts "                 \
2091           "(other young collectors)")                                       \
2092                                                                             \
2093   develop(uintx, PromotionFailureALotInterval, 5,                           \
2094           "Total collections between promotion failures a lot")             \
2095                                                                             \
2096   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2097           "Sleep time when sleep is used for yields")                       \
2098                                                                             \
2099   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2100           "Number of yields before a sleep is done during work stealing")   \
2101                                                                             \
2102   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2103           "Number of iterations in a spin loop between checks on "          \
2104           "time out of hard spin")                                          \
2105                                                                             \
2106   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2107           "Ratio of hard spins to calls to yield")                          \
2108                                                                             \
2109   develop(uintx, ObjArrayMarkingStride, 512,                                \
2110           "Number of object array elements to push onto the marking stack " \
2111           "before pushing a continuation entry")                            \
2112                                                                             \
2113   develop(bool, MetadataAllocationFailALot, false,                          \
2114           "Fail metadata allocations at intervals controlled by "           \
2115           "MetadataAllocationFailALotInterval")                             \
2116                                                                             \
2117   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2118           "Metadata allocation failure a lot interval")                     \
2119                                                                             \
2120   notproduct(bool, ExecuteInternalVMTests, false,                           \
2121           "Enable execution of internal VM tests")                          \
2122                                                                             \
2123   notproduct(bool, VerboseInternalVMTests, false,                           \
2124           "Turn on logging for internal VM tests.")                         \
2125                                                                             \
2126   product(bool, ExecutingUnitTests, false,                                  \
2127           "Whether the JVM is running unit tests or not")                   \
2128                                                                             \
2129   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2130                                                                             \
2131   product_pd(bool, ResizeTLAB,                                              \
2132           "Dynamically resize TLAB size for threads")                       \
2133                                                                             \
2134   product(bool, ZeroTLAB, false,                                            \
2135           "Zero out the newly created TLAB")                                \
2136                                                                             \
2137   product(bool, FastTLABRefill, true,                                       \
2138           "Use fast TLAB refill code")                                      \
2139                                                                             \
2140   product(bool, TLABStats, true,                                            \
2141           "Provide more detailed and expensive TLAB statistics.")           \
2142                                                                             \
2143   product_pd(bool, NeverActAsServerClassMachine,                            \
2144           "Never act like a server-class machine")                          \
2145                                                                             \
2146   product(bool, AlwaysActAsServerClassMachine, false,                       \
2147           "Always act like a server-class machine")                         \
2148                                                                             \
2149   product_pd(uint64_t, MaxRAM,                                              \
2150           "Real memory size (in bytes) used to set maximum heap size")      \
2151           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2152                                                                             \
2153   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2154           "Maximum ergonomically set heap size (in bytes); zero means use " \
2155           "MaxRAM / MaxRAMFraction")                                        \
2156           range(0, max_uintx)                                               \
2157                                                                             \
2158   product(uintx, MaxRAMFraction, 4,                                         \
2159           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2160           "size")                                                           \
2161           range(1, max_uintx)                                               \
2162                                                                             \
2163   product(uintx, MinRAMFraction, 2,                                         \
2164           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2165           "size on systems with small physical memory size")                \
2166           range(1, max_uintx)                                               \
2167                                                                             \
2168   product(uintx, InitialRAMFraction, 64,                                    \
2169           "Fraction (1/n) of real memory used for initial heap size")       \
2170           range(1, max_uintx)                                               \
2171                                                                             \
2172   develop(uintx, MaxVirtMemFraction, 2,                                     \
2173           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2174           "determining maximum heap size")                                  \
2175                                                                             \
2176   product(bool, UseAutoGCSelectPolicy, false,                               \
2177           "Use automatic collection selection policy")                      \
2178                                                                             \
2179   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2180           "Automatic GC selection pause threshold in milliseconds")         \
2181           range(0, max_uintx)                                               \
2182                                                                             \
2183   product(bool, UseAdaptiveSizePolicy, true,                                \
2184           "Use adaptive generation sizing policies")                        \
2185                                                                             \
2186   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2187           "Use adaptive survivor sizing policies")                          \
2188                                                                             \
2189   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2190           "Use adaptive young-old sizing policies at minor collections")    \
2191                                                                             \
2192   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2193           "Use adaptive young-old sizing policies at major collections")    \
2194                                                                             \
2195   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2196           "Include statistics from System.gc() for adaptive size policy")   \
2197                                                                             \
2198   product(bool, UseAdaptiveGCBoundary, false,                               \
2199           "Allow young-old boundary to move")                               \
2200                                                                             \
2201   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2202           "Resize the virtual spaces of the young or old generations")      \
2203           range(-1, 1)                                                      \
2204                                                                             \
2205   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2206           "Policy for changing generation size for throughput goals")       \
2207           range(0, 1)                                                       \
2208                                                                             \
2209   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2210           "Number of steps where heuristics is used before data is used")   \
2211           range(0, max_uintx)                                               \
2212                                                                             \
2213   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2214           "Number of collections before the adaptive sizing is started")    \
2215                                                                             \
2216   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2217           "Collection interval for printing information; zero means never") \
2218           range(0, max_uintx)                                               \
2219                                                                             \
2220   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2221           "Use adaptive minimum footprint as a goal")                       \
2222                                                                             \
2223   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2224           "Weight given to exponential resizing, between 0 and 100")        \
2225           range(0, 100)                                                     \
2226                                                                             \
2227   product(uintx, AdaptiveTimeWeight,       25,                              \
2228           "Weight given to time in adaptive policy, between 0 and 100")     \
2229           range(0, 100)                                                     \
2230                                                                             \
2231   product(uintx, PausePadding, 1,                                           \
2232           "How much buffer to keep for pause time")                         \
2233           range(0, max_juint)                                               \
2234                                                                             \
2235   product(uintx, PromotedPadding, 3,                                        \
2236           "How much buffer to keep for promotion failure")                  \
2237           range(0, max_juint)                                               \
2238                                                                             \
2239   product(uintx, SurvivorPadding, 3,                                        \
2240           "How much buffer to keep for survivor overflow")                  \
2241           range(0, max_juint)                                               \
2242                                                                             \
2243   product(uintx, ThresholdTolerance, 10,                                    \
2244           "Allowed collection cost difference between generations")         \
2245           range(0, 100)                                                     \
2246                                                                             \
2247   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2248           "If collection costs are within margin, reduce both by full "     \
2249           "delta")                                                          \
2250           range(0, 100)                                                     \
2251                                                                             \
2252   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2253           "Adaptive size percentage change in young generation")            \
2254           range(0, 100)                                                     \
2255                                                                             \
2256   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2257           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2258           range(0, 100)                                                     \
2259                                                                             \
2260   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2261           "Decay factor to YoungedGenerationSizeSupplement")                \
2262           range(1, max_uintx)                                               \
2263                                                                             \
2264   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2265           "Adaptive size percentage change in tenured generation")          \
2266           range(0, 100)                                                     \
2267                                                                             \
2268   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2269           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2270           range(0, 100)                                                     \
2271                                                                             \
2272   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2273           "Decay factor to TenuredGenerationSizeIncrement")                 \
2274           range(1, max_uintx)                                               \
2275                                                                             \
2276   product(uintx, MaxGCPauseMillis, max_uintx - 1,                           \
2277           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2278           "or (G1 Only) the maximum GC time per MMU time slice")            \
2279           range(1, max_uintx - 1)                                           \
2280           constraint(MaxGCPauseMillisConstraintFunc,AfterErgo)              \
2281                                                                             \
2282   product(uintx, GCPauseIntervalMillis, 0,                                  \
2283           "Time slice for MMU specification")                               \
2284           constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo)         \
2285                                                                             \
2286   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2287           "Adaptive size policy maximum GC minor pause time goal "          \
2288           "in millisecond")                                                 \
2289           range(0, max_uintx)                                               \
2290                                                                             \
2291   product(uintx, GCTimeRatio, 99,                                           \
2292           "Adaptive size policy application time to GC time ratio")         \
2293           range(0, max_juint)                                               \
2294                                                                             \
2295   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2296           "Adaptive size scale down factor for shrinking")                  \
2297           range(1, max_uintx)                                               \
2298                                                                             \
2299   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2300           "Adaptive size decays the major cost for long major intervals")   \
2301                                                                             \
2302   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2303           "Time scale over which major costs decay")                        \
2304           range(0, max_uintx)                                               \
2305                                                                             \
2306   product(uintx, MinSurvivorRatio, 3,                                       \
2307           "Minimum ratio of young generation/survivor space size")          \
2308           range(3, max_uintx)                                               \
2309                                                                             \
2310   product(uintx, InitialSurvivorRatio, 8,                                   \
2311           "Initial ratio of young generation/survivor space size")          \
2312           range(0, max_uintx)                                               \
2313                                                                             \
2314   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2315           "Estimate of footprint other than Java Heap")                     \
2316           range(0, max_uintx)                                               \
2317                                                                             \
2318   product(bool, UseGCOverheadLimit, true,                                   \
2319           "Use policy to limit of proportion of time spent in GC "          \
2320           "before an OutOfMemory error is thrown")                          \
2321                                                                             \
2322   product(uintx, GCTimeLimit, 98,                                           \
2323           "Limit of the proportion of time spent in GC before "             \
2324           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2325           range(0, 100)                                                     \
2326                                                                             \
2327   product(uintx, GCHeapFreeLimit, 2,                                        \
2328           "Minimum percentage of free space after a full GC before an "     \
2329           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2330           range(0, 100)                                                     \
2331                                                                             \
2332   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2333           "Number of consecutive collections before gc time limit fires")   \
2334           range(1, max_uintx)                                               \
2335                                                                             \
2336   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2337           "How far ahead to prefetch destination area (<= 0 means off)")    \
2338           range(-1, max_jint)                                               \
2339                                                                             \
2340   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2341           "How far ahead to prefetch scan area (<= 0 means off)")           \
2342           range(-1, max_jint)                                               \
2343                                                                             \
2344   product(intx, PrefetchFieldsAhead, -1,                                    \
2345           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2346           range(-1, max_jint)                                               \
2347                                                                             \
2348   diagnostic(bool, VerifyDuringStartup, false,                              \
2349           "Verify memory system before executing any Java code "            \
2350           "during VM initialization")                                       \
2351                                                                             \
2352   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2353           "Verify system before exiting")                                   \
2354                                                                             \
2355   diagnostic(bool, VerifyBeforeGC, false,                                   \
2356           "Verify memory system before GC")                                 \
2357                                                                             \
2358   diagnostic(bool, VerifyAfterGC, false,                                    \
2359           "Verify memory system after GC")                                  \
2360                                                                             \
2361   diagnostic(bool, VerifyDuringGC, false,                                   \
2362           "Verify memory system during GC (between phases)")                \
2363                                                                             \
2364   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2365           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2366           "are enabled. One or more sub-systems can be specified "          \
2367           "in a comma separated string. Sub-systems are: "                  \
2368           "threads, heap, symbol_table, string_table, codecache, "          \
2369           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2370           "c-heap, codecache_oops")                                         \
2371                                                                             \
2372   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2373           "Enable parallel memory system verification")                     \
2374                                                                             \
2375   diagnostic(bool, DeferInitialCardMark, false,                             \
2376           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2377           "may arise from new_pre_store_barrier")                           \
2378                                                                             \
2379   product(bool, UseCondCardMark, false,                                     \
2380           "Check for already marked card before updating card table")       \
2381                                                                             \
2382   diagnostic(bool, VerifyRememberedSets, false,                             \
2383           "Verify GC remembered sets")                                      \
2384                                                                             \
2385   diagnostic(bool, VerifyObjectStartArray, true,                            \
2386           "Verify GC object start array if verify before/after")            \
2387                                                                             \
2388   product(bool, DisableExplicitGC, false,                                   \
2389           "Ignore calls to System.gc()")                                    \
2390                                                                             \
2391   notproduct(bool, CheckMemoryInitialization, false,                        \
2392           "Check memory initialization")                                    \
2393                                                                             \
2394   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2395           "Bind CMS Thread to CPU if possible")                             \
2396                                                                             \
2397   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2398           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2399           range(0, max_juint)                                               \
2400                                                                             \
2401   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2402           "Bind GCTaskThreads to CPUs if possible")                         \
2403                                                                             \
2404   product(bool, UseGCTaskAffinity, false,                                   \
2405           "Use worker affinity when asking for GCTasks")                    \
2406                                                                             \
2407   product(uintx, ProcessDistributionStride, 4,                              \
2408           "Stride through processors when distributing processes")          \
2409           range(0, max_juint)                                               \
2410                                                                             \
2411   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2412           "Number of times the coordinator GC thread will sleep while "     \
2413           "yielding before giving up and resuming GC")                      \
2414           range(0, max_juint)                                               \
2415                                                                             \
2416   product(uintx, CMSYieldSleepCount, 0,                                     \
2417           "Number of times a GC thread (minus the coordinator) "            \
2418           "will sleep while yielding before giving up and resuming GC")     \
2419           range(0, max_juint)                                               \
2420                                                                             \
2421   product(bool, PrintGC, false,                                             \
2422           "Print message at garbage collection. "                           \
2423           "Deprecated, use -Xlog:gc instead.")                              \
2424                                                                             \
2425   product(bool, PrintGCDetails, false,                                      \
2426           "Print more details at garbage collection. "                      \
2427           "Deprecated, use -Xlog:gc* instead.")                             \
2428                                                                             \
2429   develop(intx, ConcGCYieldTimeout, 0,                                      \
2430           "If non-zero, assert that GC threads yield within this "          \
2431           "number of milliseconds")                                         \
2432           range(0, max_intx)                                                \
2433                                                                             \
2434   develop(bool, TraceFinalizerRegistration, false,                          \
2435           "Trace registration of final references")                         \
2436                                                                             \
2437   notproduct(bool, TraceScavenge, false,                                    \
2438           "Trace scavenge")                                                 \
2439                                                                             \
2440   product(bool, IgnoreEmptyClassPaths, false,                               \
2441           "Ignore empty path elements in -classpath")                       \
2442                                                                             \
2443   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2444           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2445           "Initial size of the boot class loader data metaspace")           \
2446           range(30*K, max_uintx/BytesPerWord)                               \
2447           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2448                                                                             \
2449   product(bool, TraceYoungGenTime, false,                                   \
2450           "Trace accumulated time for young collection")                    \
2451                                                                             \
2452   product(bool, TraceOldGenTime, false,                                     \
2453           "Trace accumulated time for old collection")                      \
2454                                                                             \
2455   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2456           "Print heap layout in response to SIGBREAK")                      \
2457                                                                             \
2458   manageable(bool, PrintClassHistogram, false,                              \
2459           "Print a histogram of class instances")                           \
2460                                                                             \
2461   develop(bool, TraceGCTaskManager, false,                                  \
2462           "Trace actions of the GC task manager")                           \
2463                                                                             \
2464   develop(bool, TraceGCTaskQueue, false,                                    \
2465           "Trace actions of the GC task queues")                            \
2466                                                                             \
2467   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2468           "Trace marking phase in ParallelOldGC")                           \
2469                                                                             \
2470   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2471           "Trace dense prefix computation for ParallelOldGC")               \
2472                                                                             \
2473   develop(bool, IgnoreLibthreadGPFault, false,                              \
2474           "Suppress workaround for libthread GP fault")                     \
2475                                                                             \
2476   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2477           "The percentage of the used heap that the instances of a class "  \
2478           "must occupy for the class to generate a trace event")            \
2479           range(0.0, 100.0)                                                 \
2480                                                                             \
2481   /* JVMTI heap profiling */                                                \
2482                                                                             \
2483   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2484           "Trace JVMTI object tagging calls")                               \
2485                                                                             \
2486   diagnostic(bool, VerifyBeforeIteration, false,                            \
2487           "Verify memory system before JVMTI iteration")                    \
2488                                                                             \
2489   /* compiler interface */                                                  \
2490                                                                             \
2491   develop(bool, CIPrintCompilerName, false,                                 \
2492           "when CIPrint is active, print the name of the active compiler")  \
2493                                                                             \
2494   diagnostic(bool, CIPrintCompileQueue, false,                              \
2495           "display the contents of the compile queue whenever a "           \
2496           "compilation is enqueued")                                        \
2497                                                                             \
2498   develop(bool, CIPrintRequests, false,                                     \
2499           "display every request for compilation")                          \
2500                                                                             \
2501   product(bool, CITime, false,                                              \
2502           "collect timing information for compilation")                     \
2503                                                                             \
2504   develop(bool, CITimeVerbose, false,                                       \
2505           "be more verbose in compilation timings")                         \
2506                                                                             \
2507   develop(bool, CITimeEach, false,                                          \
2508           "display timing information after each successful compilation")   \
2509                                                                             \
2510   develop(bool, CICountOSR, false,                                          \
2511           "use a separate counter when assigning ids to osr compilations")  \
2512                                                                             \
2513   develop(bool, CICompileNatives, true,                                     \
2514           "compile native methods if supported by the compiler")            \
2515                                                                             \
2516   develop_pd(bool, CICompileOSR,                                            \
2517           "compile on stack replacement methods if supported by the "       \
2518           "compiler")                                                       \
2519                                                                             \
2520   develop(bool, CIPrintMethodCodes, false,                                  \
2521           "print method bytecodes of the compiled code")                    \
2522                                                                             \
2523   develop(bool, CIPrintTypeFlow, false,                                     \
2524           "print the results of ciTypeFlow analysis")                       \
2525                                                                             \
2526   develop(bool, CITraceTypeFlow, false,                                     \
2527           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2528                                                                             \
2529   develop(intx, OSROnlyBCI, -1,                                             \
2530           "OSR only at this bci.  Negative values mean exclude that bci")   \
2531                                                                             \
2532   /* compiler */                                                            \
2533                                                                             \
2534   /* notice: the max range value here is max_jint, not max_intx  */         \
2535   /* because of overflow issue                                   */         \
2536   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2537           "Number of compiler threads to run")                              \
2538           range(0, max_jint)                                                \
2539           constraint(CICompilerCountConstraintFunc, AtParse)                \
2540                                                                             \
2541   product(intx, CompilationPolicyChoice, 0,                                 \
2542           "which compilation policy (0-3)")                                 \
2543           range(0, 3)                                                       \
2544                                                                             \
2545   develop(bool, UseStackBanging, true,                                      \
2546           "use stack banging for stack overflow checks (required for "      \
2547           "proper StackOverflow handling; disable only to measure cost "    \
2548           "of stackbanging)")                                               \
2549                                                                             \
2550   develop(bool, UseStrictFP, true,                                          \
2551           "use strict fp if modifier strictfp is set")                      \
2552                                                                             \
2553   develop(bool, GenerateSynchronizationCode, true,                          \
2554           "generate locking/unlocking code for synchronized methods and "   \
2555           "monitors")                                                       \
2556                                                                             \
2557   develop(bool, GenerateRangeChecks, true,                                  \
2558           "Generate range checks for array accesses")                       \
2559                                                                             \
2560   diagnostic_pd(bool, ImplicitNullChecks,                                   \
2561           "Generate code for implicit null checks")                         \
2562                                                                             \
2563   product_pd(bool, TrapBasedNullChecks,                                     \
2564           "Generate code for null checks that uses a cmp and trap "         \
2565           "instruction raising SIGTRAP.  This is only used if an access to" \
2566           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2567           "ImplicitNullChecks don't work (PPC64).")                         \
2568                                                                             \
2569   product(bool, PrintSafepointStatistics, false,                            \
2570           "Print statistics about safepoint synchronization")               \
2571                                                                             \
2572   product(intx, PrintSafepointStatisticsCount, 300,                         \
2573           "Total number of safepoint statistics collected "                 \
2574           "before printing them out")                                       \
2575           range(1, max_intx)                                                \
2576                                                                             \
2577   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2578           "Print safepoint statistics only when safepoint takes "           \
2579           "more than PrintSafepointSatisticsTimeout in millis")             \
2580   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2581   NOT_LP64(range(-1, max_intx))                                             \
2582                                                                             \
2583   product(bool, Inline, true,                                               \
2584           "Enable inlining")                                                \
2585                                                                             \
2586   product(bool, ClipInlining, true,                                         \
2587           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2588                                                                             \
2589   develop(bool, UseCHA, true,                                               \
2590           "Enable CHA")                                                     \
2591                                                                             \
2592   product(bool, UseTypeProfile, true,                                       \
2593           "Check interpreter profile for historically monomorphic calls")   \
2594                                                                             \
2595   diagnostic(bool, PrintInlining, false,                                    \
2596           "Print inlining optimizations")                                   \
2597                                                                             \
2598   product(bool, UsePopCountInstruction, false,                              \
2599           "Use population count instruction")                               \
2600                                                                             \
2601   develop(bool, EagerInitialization, false,                                 \
2602           "Eagerly initialize classes if possible")                         \
2603                                                                             \
2604   diagnostic(bool, LogTouchedMethods, false,                                \
2605           "Log methods which have been ever touched in runtime")            \
2606                                                                             \
2607   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2608           "Print all methods that have been ever touched in runtime")       \
2609                                                                             \
2610   develop(bool, TraceMethodReplacement, false,                              \
2611           "Print when methods are replaced do to recompilation")            \
2612                                                                             \
2613   develop(bool, PrintMethodFlushing, false,                                 \
2614           "Print the nmethods being flushed")                               \
2615                                                                             \
2616   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2617           "print statistics about method flushing")                         \
2618                                                                             \
2619   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2620           "Number of compiled code invocations after which "                \
2621           "the method is considered as hot by the flusher")                 \
2622           range(1, max_jint)                                                \
2623                                                                             \
2624   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2625           "Minimum number of sweeper passes before an nmethod "             \
2626           "can be flushed")                                                 \
2627           range(0, max_intx)                                                \
2628                                                                             \
2629   product(bool, UseCodeAging, true,                                         \
2630           "Insert counter to detect warm methods")                          \
2631                                                                             \
2632   diagnostic(bool, StressCodeAging, false,                                  \
2633           "Start with counters compiled in")                                \
2634                                                                             \
2635   develop(bool, UseRelocIndex, false,                                       \
2636           "Use an index to speed random access to relocations")             \
2637                                                                             \
2638   develop(bool, StressCodeBuffers, false,                                   \
2639           "Exercise code buffer expansion and other rare state changes")    \
2640                                                                             \
2641   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2642           "Generate extra debugging information for non-safepoints in "     \
2643           "nmethods")                                                       \
2644                                                                             \
2645   product(bool, PrintVMOptions, false,                                      \
2646           "Print flags that appeared on the command line")                  \
2647                                                                             \
2648   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2649           "Ignore unrecognized VM options")                                 \
2650                                                                             \
2651   product(bool, PrintCommandLineFlags, false,                               \
2652           "Print flags specified on command line or set by ergonomics")     \
2653                                                                             \
2654   product(bool, PrintFlagsInitial, false,                                   \
2655           "Print all VM flags before argument processing and exit VM")      \
2656                                                                             \
2657   product(bool, PrintFlagsFinal, false,                                     \
2658           "Print all VM flags after argument and ergonomic processing")     \
2659                                                                             \
2660   notproduct(bool, PrintFlagsWithComments, false,                           \
2661           "Print all VM flags with default values and descriptions and "    \
2662           "exit")                                                           \
2663                                                                             \
2664   product(bool, PrintFlagsRanges, false,                                    \
2665           "Print VM flags and their ranges and exit VM")                    \
2666                                                                             \
2667   diagnostic(bool, SerializeVMOutput, true,                                 \
2668           "Use a mutex to serialize output to tty and LogFile")             \
2669                                                                             \
2670   diagnostic(bool, DisplayVMOutput, true,                                   \
2671           "Display all VM output on the tty, independently of LogVMOutput") \
2672                                                                             \
2673   diagnostic(bool, LogVMOutput, false,                                      \
2674           "Save VM output to LogFile")                                      \
2675                                                                             \
2676   diagnostic(ccstr, LogFile, NULL,                                          \
2677           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2678           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2679                                                                             \
2680   product(ccstr, ErrorFile, NULL,                                           \
2681           "If an error occurs, save the error data to this file "           \
2682           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2683                                                                             \
2684   product(bool, DisplayVMOutputToStderr, false,                             \
2685           "If DisplayVMOutput is true, display all VM output to stderr")    \
2686                                                                             \
2687   product(bool, DisplayVMOutputToStdout, false,                             \
2688           "If DisplayVMOutput is true, display all VM output to stdout")    \
2689                                                                             \
2690   product(bool, UseHeavyMonitors, false,                                    \
2691           "use heavyweight instead of lightweight Java monitors")           \
2692                                                                             \
2693   product(bool, PrintStringTableStatistics, false,                          \
2694           "print statistics about the StringTable and SymbolTable")         \
2695                                                                             \
2696   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2697           "verify StringTable contents at exit")                            \
2698                                                                             \
2699   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2700           "print histogram of the symbol table")                            \
2701                                                                             \
2702   notproduct(bool, ExitVMOnVerifyError, false,                              \
2703           "standard exit from VM if bytecode verify error "                 \
2704           "(only in debug mode)")                                           \
2705                                                                             \
2706   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2707           "Call fatal if this exception is thrown.  Example: "              \
2708           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2709                                                                             \
2710   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2711           "Call fatal if the exception pointed by AbortVMOnException "      \
2712           "has this message")                                               \
2713                                                                             \
2714   develop(bool, DebugVtables, false,                                        \
2715           "add debugging code to vtable dispatch")                          \
2716                                                                             \
2717   notproduct(bool, PrintVtableStats, false,                                 \
2718           "print vtables stats at end of run")                              \
2719                                                                             \
2720   develop(bool, TraceCreateZombies, false,                                  \
2721           "trace creation of zombie nmethods")                              \
2722                                                                             \
2723   notproduct(bool, IgnoreLockingAssertions, false,                          \
2724           "disable locking assertions (for speed)")                         \
2725                                                                             \
2726   product(bool, RangeCheckElimination, true,                                \
2727           "Eliminate range checks")                                         \
2728                                                                             \
2729   develop_pd(bool, UncommonNullCast,                                        \
2730           "track occurrences of null in casts; adjust compiler tactics")    \
2731                                                                             \
2732   develop(bool, TypeProfileCasts,  true,                                    \
2733           "treat casts like calls for purposes of type profiling")          \
2734                                                                             \
2735   develop(bool, DelayCompilationDuringStartup, true,                        \
2736           "Delay invoking the compiler until main application class is "    \
2737           "loaded")                                                         \
2738                                                                             \
2739   develop(bool, CompileTheWorld, false,                                     \
2740           "Compile all methods in all classes in bootstrap class path "     \
2741             "(stress test)")                                                \
2742                                                                             \
2743   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2744           "Preload all classes used by a class before start loading")       \
2745                                                                             \
2746   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2747           "Force a safepoint every n compiles so sweeper can keep up")      \
2748                                                                             \
2749   develop(bool, FillDelaySlots, true,                                       \
2750           "Fill delay slots (on SPARC only)")                               \
2751                                                                             \
2752   develop(bool, TimeLivenessAnalysis, false,                                \
2753           "Time computation of bytecode liveness analysis")                 \
2754                                                                             \
2755   develop(bool, TraceLivenessGen, false,                                    \
2756           "Trace the generation of liveness analysis information")          \
2757                                                                             \
2758   notproduct(bool, TraceLivenessQuery, false,                               \
2759           "Trace queries of liveness analysis information")                 \
2760                                                                             \
2761   notproduct(bool, CollectIndexSetStatistics, false,                        \
2762           "Collect information about IndexSets")                            \
2763                                                                             \
2764   develop(bool, UseLoopSafepoints, true,                                    \
2765           "Generate Safepoint nodes in every loop")                         \
2766                                                                             \
2767   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2768           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2769           "Inline allocations larger than this in doublewords must go slow")\
2770                                                                             \
2771   product(bool, AggressiveOpts, false,                                      \
2772           "Enable aggressive optimizations - see arguments.cpp")            \
2773                                                                             \
2774   product_pd(bool, CompactStrings,                                          \
2775           "Enable Strings to use single byte chars in backing store")       \
2776                                                                             \
2777   product_pd(uintx, TypeProfileLevel,                                       \
2778           "=XYZ, with Z: Type profiling of arguments at call; "             \
2779                      "Y: Type profiling of return value at call; "          \
2780                      "X: Type profiling of parameters to methods; "         \
2781           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2782           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2783                                                                             \
2784   product(intx, TypeProfileArgsLimit,     2,                                \
2785           "max number of call arguments to consider for type profiling")    \
2786           range(0, 16)                                                      \
2787                                                                             \
2788   product(intx, TypeProfileParmsLimit,    2,                                \
2789           "max number of incoming parameters to consider for type profiling"\
2790           ", -1 for all")                                                   \
2791           range(-1, 64)                                                     \
2792                                                                             \
2793   /* statistics */                                                          \
2794   develop(bool, CountCompiledCalls, false,                                  \
2795           "Count method invocations")                                       \
2796                                                                             \
2797   notproduct(bool, CountRuntimeCalls, false,                                \
2798           "Count VM runtime calls")                                         \
2799                                                                             \
2800   develop(bool, CountJNICalls, false,                                       \
2801           "Count jni method invocations")                                   \
2802                                                                             \
2803   notproduct(bool, CountJVMCalls, false,                                    \
2804           "Count jvm method invocations")                                   \
2805                                                                             \
2806   notproduct(bool, CountRemovableExceptions, false,                         \
2807           "Count exceptions that could be replaced by branches due to "     \
2808           "inlining")                                                       \
2809                                                                             \
2810   notproduct(bool, ICMissHistogram, false,                                  \
2811           "Produce histogram of IC misses")                                 \
2812                                                                             \
2813   /* interpreter */                                                         \
2814   product_pd(bool, RewriteBytecodes,                                        \
2815           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2816                                                                             \
2817   product_pd(bool, RewriteFrequentPairs,                                    \
2818           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2819                                                                             \
2820   diagnostic(bool, PrintInterpreter, false,                                 \
2821           "Print the generated interpreter code")                           \
2822                                                                             \
2823   product(bool, UseInterpreter, true,                                       \
2824           "Use interpreter for non-compiled methods")                       \
2825                                                                             \
2826   develop(bool, UseFastSignatureHandlers, true,                             \
2827           "Use fast signature handlers for native calls")                   \
2828                                                                             \
2829   product(bool, UseLoopCounter, true,                                       \
2830           "Increment invocation counter on backward branch")                \
2831                                                                             \
2832   product_pd(bool, UseOnStackReplacement,                                   \
2833           "Use on stack replacement, calls runtime if invoc. counter "      \
2834           "overflows in loop")                                              \
2835                                                                             \
2836   notproduct(bool, TraceOnStackReplacement, false,                          \
2837           "Trace on stack replacement")                                     \
2838                                                                             \
2839   product_pd(bool, PreferInterpreterNativeStubs,                            \
2840           "Use always interpreter stubs for native methods invoked via "    \
2841           "interpreter")                                                    \
2842                                                                             \
2843   develop(bool, CountBytecodes, false,                                      \
2844           "Count number of bytecodes executed")                             \
2845                                                                             \
2846   develop(bool, PrintBytecodeHistogram, false,                              \
2847           "Print histogram of the executed bytecodes")                      \
2848                                                                             \
2849   develop(bool, PrintBytecodePairHistogram, false,                          \
2850           "Print histogram of the executed bytecode pairs")                 \
2851                                                                             \
2852   diagnostic(bool, PrintSignatureHandlers, false,                           \
2853           "Print code generated for native method signature handlers")      \
2854                                                                             \
2855   develop(bool, VerifyOops, false,                                          \
2856           "Do plausibility checks for oops")                                \
2857                                                                             \
2858   develop(bool, CheckUnhandledOops, false,                                  \
2859           "Check for unhandled oops in VM code")                            \
2860                                                                             \
2861   develop(bool, VerifyJNIFields, trueInDebug,                               \
2862           "Verify jfieldIDs for instance fields")                           \
2863                                                                             \
2864   notproduct(bool, VerifyJNIEnvThread, false,                               \
2865           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2866           "from JNI")                                                       \
2867                                                                             \
2868   develop(bool, VerifyFPU, false,                                           \
2869           "Verify FPU state (check for NaN's, etc.)")                       \
2870                                                                             \
2871   develop(bool, VerifyThread, false,                                        \
2872           "Watch the thread register for corruption (SPARC only)")          \
2873                                                                             \
2874   develop(bool, VerifyActivationFrameSize, false,                           \
2875           "Verify that activation frame didn't become smaller than its "    \
2876           "minimal size")                                                   \
2877                                                                             \
2878   develop(bool, TraceFrequencyInlining, false,                              \
2879           "Trace frequency based inlining")                                 \
2880                                                                             \
2881   develop_pd(bool, InlineIntrinsics,                                        \
2882           "Inline intrinsics that can be statically resolved")              \
2883                                                                             \
2884   product_pd(bool, ProfileInterpreter,                                      \
2885           "Profile at the bytecode level during interpretation")            \
2886                                                                             \
2887   develop(bool, TraceProfileInterpreter, false,                             \
2888           "Trace profiling at the bytecode level during interpretation. "   \
2889           "This outputs the profiling information collected to improve "    \
2890           "jit compilation.")                                               \
2891                                                                             \
2892   develop_pd(bool, ProfileTraps,                                            \
2893           "Profile deoptimization traps at the bytecode level")             \
2894                                                                             \
2895   product(intx, ProfileMaturityPercentage, 20,                              \
2896           "number of method invocations/branches (expressed as % of "       \
2897           "CompileThreshold) before using the method's profile")            \
2898           range(0, 100)                                                     \
2899                                                                             \
2900   diagnostic(bool, PrintMethodData, false,                                  \
2901           "Print the results of +ProfileInterpreter at end of run")         \
2902                                                                             \
2903   develop(bool, VerifyDataPointer, trueInDebug,                             \
2904           "Verify the method data pointer during interpreter profiling")    \
2905                                                                             \
2906   develop(bool, VerifyCompiledCode, false,                                  \
2907           "Include miscellaneous runtime verifications in nmethod code; "   \
2908           "default off because it disturbs nmethod size heuristics")        \
2909                                                                             \
2910   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2911           "Manually make GC thread crash then dump java stack trace;  "     \
2912           "Test only")                                                      \
2913                                                                             \
2914   /* compilation */                                                         \
2915   product(bool, UseCompiler, true,                                          \
2916           "Use Just-In-Time compilation")                                   \
2917                                                                             \
2918   develop(bool, TraceCompilationPolicy, false,                              \
2919           "Trace compilation policy")                                       \
2920                                                                             \
2921   develop(bool, TimeCompilationPolicy, false,                               \
2922           "Time the compilation policy")                                    \
2923                                                                             \
2924   product(bool, UseCounterDecay, true,                                      \
2925           "Adjust recompilation counters")                                  \
2926                                                                             \
2927   develop(intx, CounterHalfLifeTime,    30,                                 \
2928           "Half-life time of invocation counters (in seconds)")             \
2929                                                                             \
2930   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2931           "The minimum interval (in milliseconds) between invocation of "   \
2932           "CounterDecay")                                                   \
2933                                                                             \
2934   product(bool, AlwaysCompileLoopMethods, false,                            \
2935           "When using recompilation, never interpret methods "              \
2936           "containing loops")                                               \
2937                                                                             \
2938   product(bool, DontCompileHugeMethods, true,                               \
2939           "Do not compile methods > HugeMethodLimit")                       \
2940                                                                             \
2941   /* Bytecode escape analysis estimation. */                                \
2942   product(bool, EstimateArgEscape, true,                                    \
2943           "Analyze bytecodes to estimate escape state of arguments")        \
2944                                                                             \
2945   product(intx, BCEATraceLevel, 0,                                          \
2946           "How much tracing to do of bytecode escape analysis estimates "   \
2947           "(0-3)")                                                          \
2948           range(0, 3)                                                       \
2949                                                                             \
2950   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2951           "Maximum number of nested calls that are analyzed by BC EA")      \
2952           range(0, max_jint)                                                \
2953                                                                             \
2954   product(intx, MaxBCEAEstimateSize, 150,                                   \
2955           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2956           range(0, max_jint)                                                \
2957                                                                             \
2958   product(intx,  AllocatePrefetchStyle, 1,                                  \
2959           "0 = no prefetch, "                                               \
2960           "1 = generate prefetch instructions for each allocation, "        \
2961           "2 = use TLAB watermark to gate allocation prefetch, "            \
2962           "3 = generate one prefetch instruction per cache line")           \
2963           range(0, 3)                                                       \
2964                                                                             \
2965   product(intx,  AllocatePrefetchDistance, -1,                              \
2966           "Distance to prefetch ahead of allocation pointer. "              \
2967           "-1: use system-specific value (automatically determined")        \
2968           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2969                                                                             \
2970   product(intx,  AllocatePrefetchLines, 3,                                  \
2971           "Number of lines to prefetch ahead of array allocation pointer")  \
2972           range(1, 64)                                                      \
2973                                                                             \
2974   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2975           "Number of lines to prefetch ahead of instance allocation "       \
2976           "pointer")                                                        \
2977           range(1, 64)                                                      \
2978                                                                             \
2979   product(intx,  AllocatePrefetchStepSize, 16,                              \
2980           "Step size in bytes of sequential prefetch instructions")         \
2981           range(1, 512)                                                     \
2982           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2983                                                                             \
2984   product(intx,  AllocatePrefetchInstr, 0,                                  \
2985           "Select instruction to prefetch ahead of allocation pointer")     \
2986           constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit)  \
2987                                                                             \
2988   /* deoptimization */                                                      \
2989   develop(bool, TraceDeoptimization, false,                                 \
2990           "Trace deoptimization")                                           \
2991                                                                             \
2992   develop(bool, PrintDeoptimizationDetails, false,                          \
2993           "Print more information about deoptimization")                    \
2994                                                                             \
2995   develop(bool, DebugDeoptimization, false,                                 \
2996           "Tracing various information while debugging deoptimization")     \
2997                                                                             \
2998   product(intx, SelfDestructTimer, 0,                                       \
2999           "Will cause VM to terminate after a given time (in minutes) "     \
3000           "(0 means off)")                                                  \
3001           range(0, max_intx)                                                \
3002                                                                             \
3003   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3004           "The maximum number of lines in the stack trace for Java "        \
3005           "exceptions (0 means all)")                                       \
3006           range(0, max_jint/2)                                              \
3007                                                                             \
3008   develop(bool, TraceStackWalk, false,                                      \
3009           "Trace stack walking")                                            \
3010                                                                             \
3011   /* notice: the max range value here is max_jint, not max_intx  */         \
3012   /* because of overflow issue                                   */         \
3013   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3014           "Guarantee a safepoint (at least) every so many milliseconds "    \
3015           "(0 means none)"))                                                \
3016   NOT_EMBEDDED(range(0, max_jint))                                          \
3017                                                                             \
3018   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3019           "Guarantee a safepoint (at least) every so many milliseconds "    \
3020           "(0 means none)"))                                                \
3021   EMBEDDED_ONLY(range(0, max_jint))                                         \
3022                                                                             \
3023   product(intx, SafepointTimeoutDelay, 10000,                               \
3024           "Delay in milliseconds for option SafepointTimeout")              \
3025   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
3026   NOT_LP64(range(0, max_intx))                                              \
3027                                                                             \
3028   product(intx, NmethodSweepActivity, 10,                                   \
3029           "Removes cold nmethods from code cache if > 0. Higher values "    \
3030           "result in more aggressive sweeping")                             \
3031           range(0, 2000)                                                    \
3032                                                                             \
3033   notproduct(bool, LogSweeper, false,                                       \
3034           "Keep a ring buffer of sweeper activity")                         \
3035                                                                             \
3036   notproduct(intx, SweeperLogEntries, 1024,                                 \
3037           "Number of records in the ring buffer of sweeper activity")       \
3038                                                                             \
3039   notproduct(intx, MemProfilingInterval, 500,                               \
3040           "Time between each invocation of the MemProfiler")                \
3041                                                                             \
3042   develop(intx, MallocCatchPtr, -1,                                         \
3043           "Hit breakpoint when mallocing/freeing this pointer")             \
3044                                                                             \
3045   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3046           "List of assertions (file:line) to muzzle")                       \
3047                                                                             \
3048   develop(intx, StackPrintLimit, 100,                                       \
3049           "number of stack frames to print in VM-level stack dump")         \
3050                                                                             \
3051   notproduct(intx, MaxElementPrintSize, 256,                                \
3052           "maximum number of elements to print")                            \
3053                                                                             \
3054   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3055           "maximum number of subklasses to print when printing klass")      \
3056                                                                             \
3057   product(intx, MaxInlineLevel, 9,                                          \
3058           "maximum number of nested calls that are inlined")                \
3059           range(0, max_jint)                                                \
3060                                                                             \
3061   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3062           "maximum number of nested recursive calls that are inlined")      \
3063           range(0, max_jint)                                                \
3064                                                                             \
3065   develop(intx, MaxForceInlineLevel, 100,                                   \
3066           "maximum number of nested calls that are forced for inlining "    \
3067           "(using CompileCommand or marked w/ @ForceInline)")               \
3068           range(0, max_jint)                                                \
3069                                                                             \
3070   product_pd(intx, InlineSmallCode,                                         \
3071           "Only inline already compiled methods if their code size is "     \
3072           "less than this")                                                 \
3073           range(0, max_jint)                                                \
3074                                                                             \
3075   product(intx, MaxInlineSize, 35,                                          \
3076           "The maximum bytecode size of a method to be inlined")            \
3077           range(0, max_jint)                                                \
3078                                                                             \
3079   product_pd(intx, FreqInlineSize,                                          \
3080           "The maximum bytecode size of a frequent method to be inlined")   \
3081           range(0, max_jint)                                                \
3082                                                                             \
3083   product(intx, MaxTrivialSize, 6,                                          \
3084           "The maximum bytecode size of a trivial method to be inlined")    \
3085           range(0, max_jint)                                                \
3086                                                                             \
3087   product(intx, MinInliningThreshold, 250,                                  \
3088           "The minimum invocation count a method needs to have to be "      \
3089           "inlined")                                                        \
3090           range(0, max_jint)                                                \
3091                                                                             \
3092   develop(intx, MethodHistogramCutoff, 100,                                 \
3093           "The cutoff value for method invocation histogram (+CountCalls)") \
3094                                                                             \
3095   diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25,                  \
3096           "Number of interpreted methods to show in profile")               \
3097                                                                             \
3098   diagnostic(intx, ProfilerNumberOfCompiledMethods, 25,                     \
3099           "Number of compiled methods to show in profile")                  \
3100                                                                             \
3101   diagnostic(intx, ProfilerNumberOfStubMethods, 25,                         \
3102           "Number of stub methods to show in profile")                      \
3103                                                                             \
3104   diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25,                    \
3105           "Number of runtime stub nodes to show in profile")                \
3106                                                                             \
3107   product(intx, ProfileIntervalsTicks, 100,                                 \
3108           "Number of ticks between printing of interval profile "           \
3109           "(+ProfileIntervals)")                                            \
3110           range(0, max_intx)                                                \
3111                                                                             \
3112   notproduct(intx, ScavengeALotInterval,     1,                             \
3113           "Interval between which scavenge will occur with +ScavengeALot")  \
3114                                                                             \
3115   notproduct(intx, FullGCALotInterval,     1,                               \
3116           "Interval between which full gc will occur with +FullGCALot")     \
3117                                                                             \
3118   notproduct(intx, FullGCALotStart,     0,                                  \
3119           "For which invocation to start FullGCAlot")                       \
3120                                                                             \
3121   notproduct(intx, FullGCALotDummies,  32*K,                                \
3122           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3123           "to move")                                                        \
3124                                                                             \
3125   develop(intx, DontYieldALotInterval,    10,                               \
3126           "Interval between which yields will be dropped (milliseconds)")   \
3127                                                                             \
3128   develop(intx, MinSleepInterval,     1,                                    \
3129           "Minimum sleep() interval (milliseconds) when "                   \
3130           "ConvertSleepToYield is off (used for Solaris)")                  \
3131                                                                             \
3132   develop(intx, ProfilerPCTickThreshold,    15,                             \
3133           "Number of ticks in a PC buckets to be a hotspot")                \
3134                                                                             \
3135   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3136           "Number of exits until DeoptimizeALot kicks in")                  \
3137                                                                             \
3138   notproduct(intx, ZombieALotInterval,     5,                               \
3139           "Number of exits until ZombieALot kicks in")                      \
3140                                                                             \
3141   diagnostic(intx, MallocVerifyInterval,     0,                             \
3142           "If non-zero, verify C heap after every N calls to "              \
3143           "malloc/realloc/free")                                            \
3144           range(0, max_intx)                                                \
3145                                                                             \
3146   diagnostic(intx, MallocVerifyStart,     0,                                \
3147           "If non-zero, start verifying C heap after Nth call to "          \
3148           "malloc/realloc/free")                                            \
3149           range(0, max_intx)                                                \
3150                                                                             \
3151   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3152           "If non-zero, maximum number of words that malloc/realloc can "   \
3153           "allocate (for testing only)")                                    \
3154           range(0, max_uintx)                                               \
3155                                                                             \
3156   product(intx, TypeProfileWidth, 2,                                        \
3157           "Number of receiver types to record in call/cast profile")        \
3158           range(0, 8)                                                       \
3159                                                                             \
3160   experimental(intx, MethodProfileWidth, 0,                                 \
3161           "Number of methods to record in call profile")                    \
3162                                                                             \
3163   develop(intx, BciProfileWidth,      2,                                    \
3164           "Number of return bci's to record in ret profile")                \
3165                                                                             \
3166   product(intx, PerMethodRecompilationCutoff, 400,                          \
3167           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3168           range(-1, max_intx)                                               \
3169                                                                             \
3170   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3171           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3172           range(-1, max_intx)                                               \
3173                                                                             \
3174   product(intx, PerMethodTrapLimit,  100,                                   \
3175           "Limit on traps (of one kind) in a method (includes inlines)")    \
3176           range(0, max_jint)                                                \
3177                                                                             \
3178   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3179           "Limit on speculative traps (of one kind) in a method "           \
3180           "(includes inlines)")                                             \
3181           range(0, max_jint)                                                \
3182                                                                             \
3183   product(intx, PerBytecodeTrapLimit,  4,                                   \
3184           "Limit on traps (of one kind) at a particular BCI")               \
3185           range(0, max_jint)                                                \
3186                                                                             \
3187   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3188           "Extra method data trap entries for speculation")                 \
3189                                                                             \
3190   develop(intx, InlineFrequencyRatio,    20,                                \
3191           "Ratio of call site execution to caller method invocation")       \
3192           range(0, max_jint)                                                \
3193                                                                             \
3194   diagnostic_pd(intx, InlineFrequencyCount,                                 \
3195           "Count of call site execution necessary to trigger frequent "     \
3196           "inlining")                                                       \
3197           range(0, max_jint)                                                \
3198                                                                             \
3199   develop(intx, InlineThrowCount,    50,                                    \
3200           "Force inlining of interpreted methods that throw this often")    \
3201           range(0, max_jint)                                                \
3202                                                                             \
3203   develop(intx, InlineThrowMaxSize,   200,                                  \
3204           "Force inlining of throwing methods smaller than this")           \
3205           range(0, max_jint)                                                \
3206                                                                             \
3207   develop(intx, ProfilerNodeSize,  1024,                                    \
3208           "Size in K to allocate for the Profile Nodes of each thread")     \
3209           range(0, 1024)                                                    \
3210                                                                             \
3211   /* gc parameters */                                                       \
3212   product(size_t, InitialHeapSize, 0,                                       \
3213           "Initial heap size (in bytes); zero means use ergonomics")        \
3214           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3215                                                                             \
3216   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3217           "Maximum heap size (in bytes)")                                   \
3218           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3219                                                                             \
3220   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3221           "Initial tenured generation size (in bytes)")                     \
3222           range(0, max_uintx)                                               \
3223                                                                             \
3224   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3225           "Initial new generation size (in bytes)")                         \
3226           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3227                                                                             \
3228   product(size_t, MaxNewSize, max_uintx,                                    \
3229           "Maximum new generation size (in bytes), max_uintx means set "    \
3230           "ergonomically")                                                  \
3231           range(0, max_uintx)                                               \
3232                                                                             \
3233   product_pd(size_t, HeapBaseMinAddress,                                    \
3234           "OS specific low limit for heap base address")                    \
3235           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3236                                                                             \
3237   product(size_t, PretenureSizeThreshold, 0,                                \
3238           "Maximum size in bytes of objects allocated in DefNew "           \
3239           "generation; zero means no maximum")                              \
3240           range(0, max_uintx)                                               \
3241                                                                             \
3242   product(size_t, MinTLABSize, 2*K,                                         \
3243           "Minimum allowed TLAB size (in bytes)")                           \
3244           range(1, max_uintx/2)                                             \
3245           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3246                                                                             \
3247   product(size_t, TLABSize, 0,                                              \
3248           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3249           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3250                                                                             \
3251   product(size_t, YoungPLABSize, 4096,                                      \
3252           "Size of young gen promotion LAB's (in HeapWords)")               \
3253           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3254                                                                             \
3255   product(size_t, OldPLABSize, 1024,                                        \
3256           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3257           "of blocks to attempt to claim when refilling CMS LAB's")         \
3258           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3259                                                                             \
3260   product(uintx, TLABAllocationWeight, 35,                                  \
3261           "Allocation averaging weight")                                    \
3262           range(0, 100)                                                     \
3263                                                                             \
3264   /* Limit the lower bound of this flag to 1 as it is used  */              \
3265   /* in a division expression.                              */              \
3266   product(uintx, TLABWasteTargetPercent, 1,                                 \
3267           "Percentage of Eden that can be wasted")                          \
3268           range(1, 100)                                                     \
3269                                                                             \
3270   product(uintx, TLABRefillWasteFraction,    64,                            \
3271           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3272           range(1, max_juint)                                               \
3273                                                                             \
3274   product(uintx, TLABWasteIncrement,    4,                                  \
3275           "Increment allowed waste at slow allocation")                     \
3276           range(0, max_jint)                                                \
3277           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3278                                                                             \
3279   product(uintx, SurvivorRatio, 8,                                          \
3280           "Ratio of eden/survivor space size")                              \
3281           range(1, max_uintx-2)                                             \
3282           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3283                                                                             \
3284   product(uintx, NewRatio, 2,                                               \
3285           "Ratio of old/new generation sizes")                              \
3286           range(0, max_uintx-1)                                             \
3287                                                                             \
3288   product_pd(size_t, NewSizeThreadIncrease,                                 \
3289           "Additional size added to desired new generation size per "       \
3290           "non-daemon thread (in bytes)")                                   \
3291           range(0, max_uintx)                                               \
3292                                                                             \
3293   product_pd(size_t, MetaspaceSize,                                         \
3294           "Initial threshold (in bytes) at which a garbage collection "     \
3295           "is done to reduce Metaspace usage")                              \
3296           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3297                                                                             \
3298   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3299           "Maximum size of Metaspaces (in bytes)")                          \
3300           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3301                                                                             \
3302   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3303           "Maximum size of class area in Metaspace when compressed "        \
3304           "class pointers are used")                                        \
3305           range(1*M, 3*G)                                                   \
3306                                                                             \
3307   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3308           "The minimum percentage of heap free after GC to avoid expansion."\
3309           " For most GCs this applies to the old generation. In G1 and"     \
3310           " ParallelGC it applies to the whole heap.")                      \
3311           range(0, 100)                                                     \
3312           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3313                                                                             \
3314   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3315           "The maximum percentage of heap free after GC to avoid shrinking."\
3316           " For most GCs this applies to the old generation. In G1 and"     \
3317           " ParallelGC it applies to the whole heap.")                      \
3318           range(0, 100)                                                     \
3319           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3320                                                                             \
3321   product(bool, ShrinkHeapInSteps, true,                                    \
3322           "When disabled, informs the GC to shrink the java heap directly"  \
3323           " to the target size at the next full GC rather than requiring"   \
3324           " smaller steps during multiple full GCs.")                       \
3325                                                                             \
3326   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3327           "Number of milliseconds per MB of free space in the heap")        \
3328           range(0, max_intx)                                                \
3329           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3330                                                                             \
3331   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3332           "The minimum change in heap space due to GC (in bytes)")          \
3333           range(0, max_uintx)                                               \
3334                                                                             \
3335   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3336           "The minimum expansion of Metaspace (in bytes)")                  \
3337           range(0, max_uintx)                                               \
3338                                                                             \
3339   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3340           "The maximum percentage of Metaspace free after GC to avoid "     \
3341           "shrinking")                                                      \
3342           range(0, 100)                                                     \
3343           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3344                                                                             \
3345   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3346           "The minimum percentage of Metaspace free after GC to avoid "     \
3347           "expansion")                                                      \
3348           range(0, 99)                                                      \
3349           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3350                                                                             \
3351   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3352           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3353           range(0, max_uintx)                                               \
3354                                                                             \
3355   product(uintx, QueuedAllocationWarningCount, 0,                           \
3356           "Number of times an allocation that queues behind a GC "          \
3357           "will retry before printing a warning")                           \
3358           range(0, max_uintx)                                               \
3359                                                                             \
3360   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3361           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3362           range(0, max_uintx)                                               \
3363                                                                             \
3364   diagnostic(intx, VerifyGCLevel,     0,                                    \
3365           "Generation level at which to start +VerifyBefore/AfterGC")       \
3366           range(0, 1)                                                       \
3367                                                                             \
3368   product(uintx, MaxTenuringThreshold,    15,                               \
3369           "Maximum value for tenuring threshold")                           \
3370           range(0, markOopDesc::max_age + 1)                                \
3371           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3372                                                                             \
3373   product(uintx, InitialTenuringThreshold,    7,                            \
3374           "Initial value for tenuring threshold")                           \
3375           range(0, markOopDesc::max_age + 1)                                \
3376           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3377                                                                             \
3378   product(uintx, TargetSurvivorRatio,    50,                                \
3379           "Desired percentage of survivor space used after scavenge")       \
3380           range(0, 100)                                                     \
3381                                                                             \
3382   product(uintx, MarkSweepDeadRatio,     5,                                 \
3383           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3384           "Serial mark sweep treats this as both the minimum and maximum "  \
3385           "value. "                                                         \
3386           "CMS uses this value only if it falls back to mark sweep. "       \
3387           "Par compact uses a variable scale based on the density of the "  \
3388           "generation and treats this as the maximum value when the heap "  \
3389           "is either completely full or completely empty.  Par compact "    \
3390           "also has a smaller default value; see arguments.cpp.")           \
3391           range(0, 100)                                                     \
3392                                                                             \
3393   product(uint, MarkSweepAlwaysCompactCount,     4,                         \
3394           "How often should we fully compact the heap (ignoring the dead "  \
3395           "space parameters)")                                              \
3396           range(1, max_juint)                                               \
3397                                                                             \
3398   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3399           "Delay between expansion and allocation (in milliseconds)")       \
3400                                                                             \
3401   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3402           "Delay in scheduling GC workers (in milliseconds)")               \
3403                                                                             \
3404   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3405           "(Unstable) Number of times to iterate in safepoint loop "        \
3406           "before blocking VM threads ")                                    \
3407           range(-1, max_jint-1)                                             \
3408                                                                             \
3409   product(intx, DeferPollingPageLoopCount,     -1,                          \
3410           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3411           "before changing safepoint polling page to RO ")                  \
3412           range(-1, max_jint-1)                                             \
3413                                                                             \
3414   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3415           range(0, max_intx)                                                \
3416                                                                             \
3417   product(bool, PSChunkLargeArrays, true,                                   \
3418           "Process large arrays in chunks")                                 \
3419                                                                             \
3420   product(uintx, GCDrainStackTargetSize, 64,                                \
3421           "Number of entries we will try to leave on the stack "            \
3422           "during parallel gc")                                             \
3423           range(0, max_juint)                                               \
3424                                                                             \
3425   /* stack parameters */                                                    \
3426   product_pd(intx, StackYellowPages,                                        \
3427           "Number of yellow zone (recoverable overflows) pages of size "    \
3428           "4KB. If pages are bigger yellow zone is aligned up.")            \
3429           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3430                                                                             \
3431   product_pd(intx, StackRedPages,                                           \
3432           "Number of red zone (unrecoverable overflows) pages of size "     \
3433           "4KB. If pages are bigger red zone is aligned up.")               \
3434           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3435                                                                             \
3436   product_pd(intx, StackReservedPages,                                      \
3437           "Number of reserved zone (reserved to annotated methods) pages"   \
3438           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3439           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3440                                                                             \
3441   product(bool, RestrictReservedStack, true,                                \
3442           "Restrict @ReservedStackAccess to trusted classes")               \
3443                                                                             \
3444   /* greater stack shadow pages can't generate instruction to bang stack */ \
3445   product_pd(intx, StackShadowPages,                                        \
3446           "Number of shadow zone (for overflow checking) pages of size "    \
3447           "4KB. If pages are bigger shadow zone is aligned up. "            \
3448           "This should exceed the depth of the VM and native call stack.")  \
3449           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3450                                                                             \
3451   product_pd(intx, ThreadStackSize,                                         \
3452           "Thread Stack Size (in Kbytes)")                                  \
3453           range(0, (max_intx-os::vm_page_size())/(1 * K))                   \
3454                                                                             \
3455   product_pd(intx, VMThreadStackSize,                                       \
3456           "Non-Java Thread Stack Size (in Kbytes)")                         \
3457           range(0, max_intx/(1 * K))                                        \
3458                                                                             \
3459   product_pd(intx, CompilerThreadStackSize,                                 \
3460           "Compiler Thread Stack Size (in Kbytes)")                         \
3461           range(0, max_intx/(1 * K))                                        \
3462                                                                             \
3463   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3464           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3465                                                                             \
3466   /* code cache parameters                                    */            \
3467   /* ppc64/tiered compilation has large code-entry alignment. */            \
3468   develop(uintx, CodeCacheSegmentSize,                                      \
3469           64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),                   \
3470           "Code cache segment size (in bytes) - smallest unit of "          \
3471           "allocation")                                                     \
3472           range(1, 1024)                                                    \
3473           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3474                                                                             \
3475   develop_pd(intx, CodeEntryAlignment,                                      \
3476           "Code entry alignment for generated code (in bytes)")             \
3477           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3478                                                                             \
3479   product_pd(intx, OptoLoopAlignment,                                       \
3480           "Align inner loops to zero relative to this modulus")             \
3481           range(1, 16)                                                      \
3482           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3483                                                                             \
3484   product_pd(uintx, InitialCodeCacheSize,                                   \
3485           "Initial code cache size (in bytes)")                             \
3486           range(0, max_uintx)                                               \
3487                                                                             \
3488   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3489           "Minimum code cache size (in bytes) required to start VM.")       \
3490           range(0, max_uintx)                                               \
3491                                                                             \
3492   product(bool, SegmentedCodeCache, false,                                  \
3493           "Use a segmented code cache")                                     \
3494                                                                             \
3495   product_pd(uintx, ReservedCodeCacheSize,                                  \
3496           "Reserved code cache size (in bytes) - maximum code cache size")  \
3497           range(0, max_uintx)                                               \
3498                                                                             \
3499   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3500           "Size of code heap with non-profiled methods (in bytes)")         \
3501           range(0, max_uintx)                                               \
3502                                                                             \
3503   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3504           "Size of code heap with profiled methods (in bytes)")             \
3505           range(0, max_uintx)                                               \
3506                                                                             \
3507   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3508           "Size of code heap with non-nmethods (in bytes)")                 \
3509           range(0, max_uintx)                                               \
3510                                                                             \
3511   product_pd(uintx, CodeCacheExpansionSize,                                 \
3512           "Code cache expansion size (in bytes)")                           \
3513           range(0, max_uintx)                                               \
3514                                                                             \
3515   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3516           "Minimum number of segments in a code cache block")               \
3517           range(1, 100)                                                     \
3518                                                                             \
3519   notproduct(bool, ExitOnFullCodeCache, false,                              \
3520           "Exit the VM if we fill the code cache")                          \
3521                                                                             \
3522   product(bool, UseCodeCacheFlushing, true,                                 \
3523           "Remove cold/old nmethods from the code cache")                   \
3524                                                                             \
3525   product(uintx, StartAggressiveSweepingAt, 10,                             \
3526           "Start aggressive sweeping if X[%] of the code cache is free."    \
3527           "Segmented code cache: X[%] of the non-profiled heap."            \
3528           "Non-segmented code cache: X[%] of the total code cache")         \
3529           range(0, 100)                                                     \
3530                                                                             \
3531   /* interpreter debugging */                                               \
3532   develop(intx, BinarySwitchThreshold, 5,                                   \
3533           "Minimal number of lookupswitch entries for rewriting to binary " \
3534           "switch")                                                         \
3535                                                                             \
3536   develop(intx, StopInterpreterAt, 0,                                       \
3537           "Stop interpreter execution at specified bytecode number")        \
3538                                                                             \
3539   develop(intx, TraceBytecodesAt, 0,                                        \
3540           "Trace bytecodes starting with specified bytecode number")        \
3541                                                                             \
3542   /* compiler interface */                                                  \
3543   develop(intx, CIStart, 0,                                                 \
3544           "The id of the first compilation to permit")                      \
3545                                                                             \
3546   develop(intx, CIStop, max_jint,                                           \
3547           "The id of the last compilation to permit")                       \
3548                                                                             \
3549   develop(intx, CIStartOSR, 0,                                              \
3550           "The id of the first osr compilation to permit "                  \
3551           "(CICountOSR must be on)")                                        \
3552                                                                             \
3553   develop(intx, CIStopOSR, max_jint,                                        \
3554           "The id of the last osr compilation to permit "                   \
3555           "(CICountOSR must be on)")                                        \
3556                                                                             \
3557   develop(intx, CIBreakAtOSR, -1,                                           \
3558           "The id of osr compilation to break at")                          \
3559                                                                             \
3560   develop(intx, CIBreakAt, -1,                                              \
3561           "The id of compilation to break at")                              \
3562                                                                             \
3563   product(ccstrlist, CompileOnly, "",                                       \
3564           "List of methods (pkg/class.name) to restrict compilation to")    \
3565                                                                             \
3566   product(ccstr, CompileCommandFile, NULL,                                  \
3567           "Read compiler commands from this file [.hotspot_compiler]")      \
3568                                                                             \
3569   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3570           "Read compiler directives from this file")                        \
3571                                                                             \
3572   product(ccstrlist, CompileCommand, "",                                    \
3573           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3574                                                                             \
3575   develop(bool, ReplayCompiles, false,                                      \
3576           "Enable replay of compilations from ReplayDataFile")              \
3577                                                                             \
3578   product(ccstr, ReplayDataFile, NULL,                                      \
3579           "File containing compilation replay information"                  \
3580           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3581                                                                             \
3582    product(ccstr, InlineDataFile, NULL,                                     \
3583           "File containing inlining replay information"                     \
3584           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3585                                                                             \
3586   develop(intx, ReplaySuppressInitializers, 2,                              \
3587           "Control handling of class initialization during replay: "        \
3588           "0 - don't do anything special; "                                 \
3589           "1 - treat all class initializers as empty; "                     \
3590           "2 - treat class initializers for application classes as empty; " \
3591           "3 - allow all class initializers to run during bootstrap but "   \
3592           "    pretend they are empty after starting replay")               \
3593           range(0, 3)                                                       \
3594                                                                             \
3595   develop(bool, ReplayIgnoreInitErrors, false,                              \
3596           "Ignore exceptions thrown during initialization for replay")      \
3597                                                                             \
3598   product(bool, DumpReplayDataOnError, true,                                \
3599           "Record replay data for crashing compiler threads")               \
3600                                                                             \
3601   product(bool, CICompilerCountPerCPU, false,                               \
3602           "1 compiler thread for log(N CPUs)")                              \
3603                                                                             \
3604   develop(intx, CIFireOOMAt,    -1,                                         \
3605           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3606           "(non-negative value throws OOM after this many CI accesses "     \
3607           "in each compile)")                                               \
3608   notproduct(intx, CICrashAt, -1,                                           \
3609           "id of compilation to trigger assert in compiler thread for "     \
3610           "the purpose of testing, e.g. generation of replay data")         \
3611   notproduct(bool, CIObjectFactoryVerify, false,                            \
3612           "enable potentially expensive verification in ciObjectFactory")   \
3613                                                                             \
3614   /* Priorities */                                                          \
3615   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3616                                                                             \
3617   product(intx, ThreadPriorityPolicy, 0,                                    \
3618           "0 : Normal.                                                     "\
3619           "    VM chooses priorities that are appropriate for normal       "\
3620           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3621           "    to normal native priority. Java priorities below "           \
3622           "    NORM_PRIORITY map to lower native priority values. On       "\
3623           "    Windows applications are allowed to use higher native       "\
3624           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3625           "    not use the highest possible native priority,               "\
3626           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3627           "    system threads. On Linux thread priorities are ignored      "\
3628           "    because the OS does not support static priority in          "\
3629           "    SCHED_OTHER scheduling class which is the only choice for   "\
3630           "    non-root, non-realtime applications.                        "\
3631           "1 : Aggressive.                                                 "\
3632           "    Java thread priorities map over to the entire range of      "\
3633           "    native thread priorities. Higher Java thread priorities map "\
3634           "    to higher native thread priorities. This policy should be   "\
3635           "    used with care, as sometimes it can cause performance       "\
3636           "    degradation in the application and/or the entire system. On "\
3637           "    Linux this policy requires root privilege.")                 \
3638           range(0, 1)                                                       \
3639                                                                             \
3640   product(bool, ThreadPriorityVerbose, false,                               \
3641           "Print priority changes")                                         \
3642                                                                             \
3643   product(intx, CompilerThreadPriority, -1,                                 \
3644           "The native priority at which compiler threads should run "       \
3645           "(-1 means no change)")                                           \
3646           range(min_jint, max_jint)                                         \
3647           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3648                                                                             \
3649   product(intx, VMThreadPriority, -1,                                       \
3650           "The native priority at which the VM thread should run "          \
3651           "(-1 means no change)")                                           \
3652           range(-1, 127)                                                    \
3653                                                                             \
3654   product(bool, CompilerThreadHintNoPreempt, true,                          \
3655           "(Solaris only) Give compiler threads an extra quanta")           \
3656                                                                             \
3657   product(bool, VMThreadHintNoPreempt, false,                               \
3658           "(Solaris only) Give VM thread an extra quanta")                  \
3659                                                                             \
3660   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3661           "Map Java priorities to OS priorities")                           \
3662           range(-1, 127)                                                    \
3663                                                                             \
3664   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3665           "Map Java priorities to OS priorities")                           \
3666           range(-1, 127)                                                    \
3667                                                                             \
3668   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3669           "Map Java priorities to OS priorities")                           \
3670           range(-1, 127)                                                    \
3671                                                                             \
3672   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3673           "Map Java priorities to OS priorities")                           \
3674           range(-1, 127)                                                    \
3675                                                                             \
3676   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3677           "Map Java priorities to OS priorities")                           \
3678           range(-1, 127)                                                    \
3679                                                                             \
3680   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3681           "Map Java priorities to OS priorities")                           \
3682           range(-1, 127)                                                    \
3683                                                                             \
3684   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3685           "Map Java priorities to OS priorities")                           \
3686           range(-1, 127)                                                    \
3687                                                                             \
3688   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3689           "Map Java priorities to OS priorities")                           \
3690           range(-1, 127)                                                    \
3691                                                                             \
3692   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3693           "Map Java priorities to OS priorities")                           \
3694           range(-1, 127)                                                    \
3695                                                                             \
3696   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3697           "Map Java priorities to OS priorities")                           \
3698           range(-1, 127)                                                    \
3699                                                                             \
3700   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3701           "Java thread priority 10 maps to critical scheduling priority")   \
3702                                                                             \
3703   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3704           "Compiler thread(s) run at critical scheduling priority")         \
3705                                                                             \
3706   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3707           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3708                                                                             \
3709   /* compiler debugging */                                                  \
3710   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3711           "First class to consider when using +CompileTheWorld")            \
3712                                                                             \
3713   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3714           "Last class to consider when using +CompileTheWorld")             \
3715                                                                             \
3716   develop(intx, NewCodeParameter,      0,                                   \
3717           "Testing Only: Create a dedicated integer parameter before "      \
3718           "putback")                                                        \
3719                                                                             \
3720   /* new oopmap storage allocation */                                       \
3721   develop(intx, MinOopMapAllocation,     8,                                 \
3722           "Minimum number of OopMap entries in an OopMapSet")               \
3723                                                                             \
3724   /* Background Compilation */                                              \
3725   develop(intx, LongCompileThreshold,     50,                               \
3726           "Used with +TraceLongCompiles")                                   \
3727                                                                             \
3728   /* recompilation */                                                       \
3729   product_pd(intx, CompileThreshold,                                        \
3730           "number of interpreted method invocations before (re-)compiling") \
3731           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3732                                                                             \
3733   product(double, CompileThresholdScaling, 1.0,                             \
3734           "Factor to control when first compilation happens "               \
3735           "(both with and without tiered compilation): "                    \
3736           "values greater than 1.0 delay counter overflow, "                \
3737           "values between 0 and 1.0 rush counter overflow, "                \
3738           "value of 1.0 leaves compilation thresholds unchanged "           \
3739           "value of 0.0 is equivalent to -Xint. "                           \
3740           ""                                                                \
3741           "Flag can be set as per-method option. "                          \
3742           "If a value is specified for a method, compilation thresholds "   \
3743           "for that method are scaled by both the value of the global flag "\
3744           "and the value of the per-method flag.")                          \
3745           range(0.0, DBL_MAX)                                               \
3746                                                                             \
3747   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3748           "Interpreter (tier 0) invocation notification frequency")         \
3749           range(0, 30)                                                      \
3750                                                                             \
3751   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3752           "C1 without MDO (tier 2) invocation notification frequency")      \
3753           range(0, 30)                                                      \
3754                                                                             \
3755   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3756           "C1 with MDO profiling (tier 3) invocation notification "         \
3757           "frequency")                                                      \
3758           range(0, 30)                                                      \
3759                                                                             \
3760   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3761           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3762           range(0, 30)                                                      \
3763                                                                             \
3764   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3765           "Interpreter (tier 0) invocation notification frequency")         \
3766           range(0, 30)                                                      \
3767                                                                             \
3768   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3769           "C1 without MDO (tier 2) invocation notification frequency")      \
3770           range(0, 30)                                                      \
3771                                                                             \
3772   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3773           "C1 with MDO profiling (tier 3) invocation notification "         \
3774           "frequency")                                                      \
3775           range(0, 30)                                                      \
3776                                                                             \
3777   product(intx, Tier2CompileThreshold, 0,                                   \
3778           "threshold at which tier 2 compilation is invoked")               \
3779           range(0, max_jint)                                                \
3780                                                                             \
3781   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3782           "Back edge threshold at which tier 2 compilation is invoked")     \
3783           range(0, max_jint)                                                \
3784                                                                             \
3785   product(intx, Tier3InvocationThreshold, 200,                              \
3786           "Compile if number of method invocations crosses this "           \
3787           "threshold")                                                      \
3788           range(0, max_jint)                                                \
3789                                                                             \
3790   product(intx, Tier3MinInvocationThreshold, 100,                           \
3791           "Minimum invocation to compile at tier 3")                        \
3792           range(0, max_jint)                                                \
3793                                                                             \
3794   product(intx, Tier3CompileThreshold, 2000,                                \
3795           "Threshold at which tier 3 compilation is invoked (invocation "   \
3796           "minimum must be satisfied)")                                     \
3797           range(0, max_jint)                                                \
3798                                                                             \
3799   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3800           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3801           range(0, max_jint)                                                \
3802                                                                             \
3803   product(intx, Tier4InvocationThreshold, 5000,                             \
3804           "Compile if number of method invocations crosses this "           \
3805           "threshold")                                                      \
3806           range(0, max_jint)                                                \
3807                                                                             \
3808   product(intx, Tier4MinInvocationThreshold, 600,                           \
3809           "Minimum invocation to compile at tier 4")                        \
3810           range(0, max_jint)                                                \
3811                                                                             \
3812   product(intx, Tier4CompileThreshold, 15000,                               \
3813           "Threshold at which tier 4 compilation is invoked (invocation "   \
3814           "minimum must be satisfied")                                      \
3815           range(0, max_jint)                                                \
3816                                                                             \
3817   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3818           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3819           range(0, max_jint)                                                \
3820                                                                             \
3821   product(intx, Tier3DelayOn, 5,                                            \
3822           "If C2 queue size grows over this amount per compiler thread "    \
3823           "stop compiling at tier 3 and start compiling at tier 2")         \
3824           range(0, max_jint)                                                \
3825                                                                             \
3826   product(intx, Tier3DelayOff, 2,                                           \
3827           "If C2 queue size is less than this amount per compiler thread "  \
3828           "allow methods compiled at tier 2 transition to tier 3")          \
3829           range(0, max_jint)                                                \
3830                                                                             \
3831   product(intx, Tier3LoadFeedback, 5,                                       \
3832           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3833           "reaches this amount per compiler thread")                        \
3834           range(0, max_jint)                                                \
3835                                                                             \
3836   product(intx, Tier4LoadFeedback, 3,                                       \
3837           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3838           "reaches this amount per compiler thread")                        \
3839           range(0, max_jint)                                                \
3840                                                                             \
3841   product(intx, TieredCompileTaskTimeout, 50,                               \
3842           "Kill compile task if method was not used within "                \
3843           "given timeout in milliseconds")                                  \
3844           range(0, max_intx)                                                \
3845                                                                             \
3846   product(intx, TieredStopAtLevel, 4,                                       \
3847           "Stop at given compilation level")                                \
3848           range(0, 4)                                                       \
3849                                                                             \
3850   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3851           "Start profiling in interpreter if the counters exceed tier 3 "   \
3852           "thresholds by the specified percentage")                         \
3853           range(0, max_jint)                                                \
3854                                                                             \
3855   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3856           "Increase the compile threshold for C1 compilation if the code "  \
3857           "cache is filled by the specified percentage")                    \
3858           range(0, 99)                                                      \
3859                                                                             \
3860   product(intx, TieredRateUpdateMinTime, 1,                                 \
3861           "Minimum rate sampling interval (in milliseconds)")               \
3862           range(0, max_intx)                                                \
3863                                                                             \
3864   product(intx, TieredRateUpdateMaxTime, 25,                                \
3865           "Maximum rate sampling interval (in milliseconds)")               \
3866           range(0, max_intx)                                                \
3867                                                                             \
3868   product_pd(bool, TieredCompilation,                                       \
3869           "Enable tiered compilation")                                      \
3870                                                                             \
3871   product(bool, PrintTieredEvents, false,                                   \
3872           "Print tiered events notifications")                              \
3873                                                                             \
3874   product_pd(intx, OnStackReplacePercentage,                                \
3875           "NON_TIERED number of method invocations/branches (expressed as " \
3876           "% of CompileThreshold) before (re-)compiling OSR code")          \
3877           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3878                                                                             \
3879   product(intx, InterpreterProfilePercentage, 33,                           \
3880           "NON_TIERED number of method invocations/branches (expressed as " \
3881           "% of CompileThreshold) before profiling in the interpreter")     \
3882           range(0, 100)                                                     \
3883                                                                             \
3884   develop(intx, MaxRecompilationSearchLength,    10,                        \
3885           "The maximum number of frames to inspect when searching for "     \
3886           "recompilee")                                                     \
3887                                                                             \
3888   develop(intx, MaxInterpretedSearchLength,     3,                          \
3889           "The maximum number of interpreted frames to skip when searching "\
3890           "for recompilee")                                                 \
3891                                                                             \
3892   develop(intx, DesiredMethodLimit,  8000,                                  \
3893           "The desired maximum method size (in bytecodes) after inlining")  \
3894                                                                             \
3895   develop(intx, HugeMethodLimit,  8000,                                     \
3896           "Don't compile methods larger than this if "                      \
3897           "+DontCompileHugeMethods")                                        \
3898                                                                             \
3899   /* New JDK 1.4 reflection implementation */                               \
3900                                                                             \
3901   develop(intx, FastSuperclassLimit, 8,                                     \
3902           "Depth of hardwired instanceof accelerator array")                \
3903                                                                             \
3904   /* Properties for Java libraries  */                                      \
3905                                                                             \
3906   product(uint64_t, MaxDirectMemorySize, 0,                                 \
3907           "Maximum total size of NIO direct-buffer allocations")            \
3908           range(0, max_jlong)                                               \
3909                                                                             \
3910   /* Flags used for temporary code during development  */                   \
3911                                                                             \
3912   diagnostic(bool, UseNewCode, false,                                       \
3913           "Testing Only: Use the new version while testing")                \
3914                                                                             \
3915   diagnostic(bool, UseNewCode2, false,                                      \
3916           "Testing Only: Use the new version while testing")                \
3917                                                                             \
3918   diagnostic(bool, UseNewCode3, false,                                      \
3919           "Testing Only: Use the new version while testing")                \
3920                                                                             \
3921   /* flags for performance data collection */                               \
3922                                                                             \
3923   product(bool, UsePerfData, falseInEmbedded,                               \
3924           "Flag to disable jvmstat instrumentation for performance testing "\
3925           "and problem isolation purposes")                                 \
3926                                                                             \
3927   product(bool, PerfDataSaveToFile, false,                                  \
3928           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3929                                                                             \
3930   product(ccstr, PerfDataSaveFile, NULL,                                    \
3931           "Save PerfData memory to the specified absolute pathname. "       \
3932           "The string %p in the file name (if present) "                    \
3933           "will be replaced by pid")                                        \
3934                                                                             \
3935   product(intx, PerfDataSamplingInterval, 50,                               \
3936           "Data sampling interval (in milliseconds)")                       \
3937           range(PeriodicTask::min_interval, max_jint)                       \
3938           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3939                                                                             \
3940   develop(bool, PerfTraceDataCreation, false,                               \
3941           "Trace creation of Performance Data Entries")                     \
3942                                                                             \
3943   develop(bool, PerfTraceMemOps, false,                                     \
3944           "Trace PerfMemory create/attach/detach calls")                    \
3945                                                                             \
3946   product(bool, PerfDisableSharedMem, false,                                \
3947           "Store performance data in standard memory")                      \
3948                                                                             \
3949   product(intx, PerfDataMemorySize, 32*K,                                   \
3950           "Size of performance data memory region. Will be rounded "        \
3951           "up to a multiple of the native os page size.")                   \
3952           range(128, 32*64*K)                                               \
3953                                                                             \
3954   product(intx, PerfMaxStringConstLength, 1024,                             \
3955           "Maximum PerfStringConstant string length before truncation")     \
3956           range(32, 32*K)                                                   \
3957                                                                             \
3958   product(bool, PerfAllowAtExitRegistration, false,                         \
3959           "Allow registration of atexit() methods")                         \
3960                                                                             \
3961   product(bool, PerfBypassFileSystemCheck, false,                           \
3962           "Bypass Win32 file system criteria checks (Windows Only)")        \
3963                                                                             \
3964   product(intx, UnguardOnExecutionViolation, 0,                             \
3965           "Unguard page and retry on no-execute fault (Win32 only) "        \
3966           "0=off, 1=conservative, 2=aggressive")                            \
3967           range(0, 2)                                                       \
3968                                                                             \
3969   /* Serviceability Support */                                              \
3970                                                                             \
3971   product(bool, ManagementServer, false,                                    \
3972           "Create JMX Management Server")                                   \
3973                                                                             \
3974   product(bool, DisableAttachMechanism, false,                              \
3975           "Disable mechanism that allows tools to attach to this VM")       \
3976                                                                             \
3977   product(bool, StartAttachListener, false,                                 \
3978           "Always start Attach Listener at VM startup")                     \
3979                                                                             \
3980   manageable(bool, PrintConcurrentLocks, false,                             \
3981           "Print java.util.concurrent locks in thread dump")                \
3982                                                                             \
3983   product(bool, TransmitErrorReport, false,                                 \
3984           "Enable error report transmission on erroneous termination")      \
3985                                                                             \
3986   product(ccstr, ErrorReportServer, NULL,                                   \
3987           "Override built-in error report server address")                  \
3988                                                                             \
3989   /* Shared spaces */                                                       \
3990                                                                             \
3991   product(bool, UseSharedSpaces, true,                                      \
3992           "Use shared spaces for metadata")                                 \
3993                                                                             \
3994   product(bool, VerifySharedSpaces, false,                                  \
3995           "Verify shared spaces (false for default archive, true for "      \
3996           "archive specified by -XX:SharedArchiveFile)")                    \
3997                                                                             \
3998   product(bool, RequireSharedSpaces, false,                                 \
3999           "Require shared spaces for metadata")                             \
4000                                                                             \
4001   product(bool, DumpSharedSpaces, false,                                    \
4002           "Special mode: JVM reads a class list, loads classes, builds "    \
4003           "shared spaces, and dumps the shared spaces to a file to be "     \
4004           "used in future JVM runs")                                        \
4005                                                                             \
4006   product(bool, PrintSharedSpaces, false,                                   \
4007           "Print usage of shared spaces")                                   \
4008                                                                             \
4009   product(bool, PrintSharedArchiveAndExit, false,                           \
4010           "Print shared archive file contents")                             \
4011                                                                             \
4012   product(bool, PrintSharedDictionary, false,                               \
4013           "If PrintSharedArchiveAndExit is true, also print the shared "    \
4014           "dictionary")                                                     \
4015                                                                             \
4016   product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE,      \
4017           "Size of read-write space for metadata (in bytes)")               \
4018           range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE)     \
4019           constraint(SharedReadWriteSizeConstraintFunc,AfterErgo)           \
4020                                                                             \
4021   product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE,        \
4022           "Size of read-only space for metadata (in bytes)")                \
4023           range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE)       \
4024           constraint(SharedReadOnlySizeConstraintFunc,AfterErgo)            \
4025                                                                             \
4026   product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE,        \
4027           "Size of the shared miscellaneous data area (in bytes)")          \
4028           range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE)       \
4029           constraint(SharedMiscDataSizeConstraintFunc,AfterErgo)            \
4030                                                                             \
4031   product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE,        \
4032           "Size of the shared miscellaneous code area (in bytes)")          \
4033           range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE)       \
4034           constraint(SharedMiscCodeSizeConstraintFunc,AfterErgo)            \
4035                                                                             \
4036   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
4037           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
4038           "Address to allocate shared memory region for class data")        \
4039           range(0, SIZE_MAX)                                                \
4040                                                                             \
4041   product(uintx, SharedSymbolTableBucketSize, 4,                            \
4042           "Average number of symbols per bucket in shared table")           \
4043           range(2, 246)                                                     \
4044                                                                             \
4045   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
4046           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
4047           "classes. Just exclude them from the shared dictionary.")         \
4048                                                                             \
4049   diagnostic(bool, PrintMethodHandleStubs, false,                           \
4050           "Print generated stub code for method handles")                   \
4051                                                                             \
4052   develop(bool, TraceMethodHandles, false,                                  \
4053           "trace internal method handle operations")                        \
4054                                                                             \
4055   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
4056           "perform extra checks when constructing method handles")          \
4057                                                                             \
4058   diagnostic(bool, ShowHiddenFrames, false,                                 \
4059           "show method handle implementation frames (usually hidden)")      \
4060                                                                             \
4061   experimental(bool, TrustFinalNonStaticFields, false,                      \
4062           "trust final non-static declarations for constant folding")       \
4063                                                                             \
4064   diagnostic(bool, FoldStableValues, true,                                  \
4065           "Optimize loads from stable fields (marked w/ @Stable)")          \
4066                                                                             \
4067   develop(bool, TraceInvokeDynamic, false,                                  \
4068           "trace internal invoke dynamic operations")                       \
4069                                                                             \
4070   diagnostic(bool, PauseAtStartup,      false,                              \
4071           "Causes the VM to pause at startup time and wait for the pause "  \
4072           "file to be removed (default: ./vm.paused.<pid>)")                \
4073                                                                             \
4074   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
4075           "The file to create and for whose removal to await when pausing " \
4076           "at startup. (default: ./vm.paused.<pid>)")                       \
4077                                                                             \
4078   diagnostic(bool, PauseAtExit, false,                                      \
4079           "Pause and wait for keypress on exit if a debugger is attached")  \
4080                                                                             \
4081   product(bool, ExtendedDTraceProbes,    false,                             \
4082           "Enable performance-impacting dtrace probes")                     \
4083                                                                             \
4084   product(bool, DTraceMethodProbes, false,                                  \
4085           "Enable dtrace probes for method-entry and method-exit")          \
4086                                                                             \
4087   product(bool, DTraceAllocProbes, false,                                   \
4088           "Enable dtrace probes for object allocation")                     \
4089                                                                             \
4090   product(bool, DTraceMonitorProbes, false,                                 \
4091           "Enable dtrace probes for monitor events")                        \
4092                                                                             \
4093   product(bool, RelaxAccessControlCheck, false,                             \
4094           "Relax the access control checks in the verifier")                \
4095                                                                             \
4096   product(uintx, StringTableSize, defaultStringTableSize,                   \
4097           "Number of buckets in the interned String table")                 \
4098           range(minimumStringTableSize, 111*defaultStringTableSize)         \
4099                                                                             \
4100   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
4101           "Number of buckets in the JVM internal Symbol table")             \
4102           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
4103                                                                             \
4104   product(bool, UseStringDeduplication, false,                              \
4105           "Use string deduplication")                                       \
4106                                                                             \
4107   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4108           "A string must reach this age (or be promoted to an old region) " \
4109           "to be considered for deduplication")                             \
4110           range(1, markOopDesc::max_age)                                    \
4111                                                                             \
4112   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4113           "Force table resize every time the table is scanned")             \
4114                                                                             \
4115   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4116           "Force table rehash every time the table is scanned")             \
4117                                                                             \
4118   diagnostic(bool, WhiteBoxAPI, false,                                      \
4119           "Enable internal testing APIs")                                   \
4120                                                                             \
4121   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4122            "Default survivor space alignment in bytes")                     \
4123            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4124                                                                             \
4125   product(bool , AllowNonVirtualCalls, false,                               \
4126           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4127                                                                             \
4128   product(ccstr, DumpLoadedClassList, NULL,                                 \
4129           "Dump the names all loaded classes, that could be stored into "   \
4130           "the CDS archive, in the specified file")                         \
4131                                                                             \
4132   product(ccstr, SharedClassListFile, NULL,                                 \
4133           "Override the default CDS class list")                            \
4134                                                                             \
4135   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4136           "Override the default location of the CDS archive file")          \
4137                                                                             \
4138   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4139           "Extra classlist for building the CDS archive file")              \
4140                                                                             \
4141   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4142           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4143           "Allocation less than this value will be allocated "              \
4144           "using malloc. Larger allocations will use mmap.")                \
4145                                                                             \
4146   experimental(bool, AlwaysAtomicAccesses, false,                           \
4147           "Accesses to all variables should always be atomic")              \
4148                                                                             \
4149   product(bool, EnableTracing, false,                                       \
4150           "Enable event-based tracing")                                     \
4151                                                                             \
4152   product(bool, UseLockedTracing, false,                                    \
4153           "Use locked-tracing when doing event-based tracing")              \
4154                                                                             \
4155   diagnostic(bool, UseUnalignedAccesses, false,                             \
4156           "Use unaligned memory accesses in Unsafe")                        \
4157                                                                             \
4158   product_pd(bool, PreserveFramePointer,                                    \
4159              "Use the FP register for holding the frame pointer "           \
4160              "and not as a general purpose register.")                      \
4161                                                                             \
4162   diagnostic(bool, CheckIntrinsics, true,                                   \
4163              "When a class C is loaded, check that "                        \
4164              "(1) all intrinsics defined by the VM for class C are present "\
4165              "in the loaded class file and are marked with the "            \
4166              "@HotSpotIntrinsicCandidate annotation, that "                 \
4167              "(2) there is an intrinsic registered for all loaded methods " \
4168              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4169              "annotation, and that "                                        \
4170              "(3) no orphan methods exist for class C (i.e., methods for "  \
4171              "which the VM declares an intrinsic but that are not declared "\
4172              "in the loaded class C. "                                      \
4173              "Check (3) is available only in debug builds.")                \
4174                                                                             \
4175   diagnostic_pd(intx, InitArrayShortSize,                                   \
4176           "Threshold small size (in bytes) for clearing arrays. "           \
4177           "Anything this size or smaller may get converted to discrete "    \
4178           "scalar stores.")                                                 \
4179           range(0, max_intx)                                                \
4180           constraint(InitArrayShortSizeConstraintFunc, AfterErgo)           \
4181                                                                             \
4182   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4183              "Disable backwards compatibility for compile commands.")       \
4184                                                                             \
4185   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4186              "Print compiler directives on installation.")                  \
4187   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4188              "Limit on number of compiler directives.")
4189 
4190 
4191 /*
4192  *  Macros for factoring of globals
4193  */
4194 
4195 // Interface macros
4196 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4197 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4198 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4199 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc)       extern "C" type name;
4200 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4201 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4202 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4203 #ifdef PRODUCT
4204 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4205 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4206 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4207 #else
4208 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4209 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4210 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4211 #endif // PRODUCT
4212 // Special LP64 flags, product only needed for now.
4213 #ifdef _LP64
4214 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4215 #else
4216 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4217 #endif // _LP64
4218 
4219 // Implementation macros
4220 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4221 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4222 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4223 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc)       type name = pd_##name;
4224 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4225 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4226 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4227 #ifdef PRODUCT
4228 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4229 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4230 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4231 #else
4232 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4233 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4234 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4235 #endif // PRODUCT
4236 #ifdef _LP64
4237 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4238 #else
4239 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4240 #endif // _LP64
4241 
4242 // Only materialize src code for range checking when required, ignore otherwise
4243 #define IGNORE_RANGE(a, b)
4244 // Only materialize src code for contraint checking when required, ignore otherwise
4245 #define IGNORE_CONSTRAINT(func,type)
4246 
4247 #define IGNORE_WRITEABLE(type)
4248 
4249 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4250               DECLARE_PD_DEVELOPER_FLAG, \
4251               DECLARE_PRODUCT_FLAG, \
4252               DECLARE_PD_PRODUCT_FLAG, \
4253               DECLARE_DIAGNOSTIC_FLAG, \
4254               DECLARE_PD_DIAGNOSTIC_FLAG, \
4255               DECLARE_EXPERIMENTAL_FLAG, \
4256               DECLARE_NOTPRODUCT_FLAG, \
4257               DECLARE_MANAGEABLE_FLAG, \
4258               DECLARE_PRODUCT_RW_FLAG, \
4259               DECLARE_LP64_PRODUCT_FLAG, \
4260               IGNORE_RANGE, \
4261               IGNORE_CONSTRAINT, \
4262               IGNORE_WRITEABLE)
4263 
4264 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4265                  DECLARE_PD_DEVELOPER_FLAG, \
4266                  DECLARE_PRODUCT_FLAG, \
4267                  DECLARE_PD_PRODUCT_FLAG, \
4268                  DECLARE_DIAGNOSTIC_FLAG, \
4269                  DECLARE_PD_DIAGNOSTIC_FLAG, \
4270                  DECLARE_NOTPRODUCT_FLAG, \
4271                  IGNORE_RANGE, \
4272                  IGNORE_CONSTRAINT, \
4273                  IGNORE_WRITEABLE)
4274 
4275 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4276            DECLARE_PRODUCT_FLAG, \
4277            DECLARE_DIAGNOSTIC_FLAG, \
4278            DECLARE_EXPERIMENTAL_FLAG, \
4279            DECLARE_NOTPRODUCT_FLAG, \
4280            IGNORE_RANGE, \
4281            IGNORE_CONSTRAINT, \
4282            IGNORE_WRITEABLE)
4283 
4284 // Extensions
4285 
4286 #include "runtime/globals_ext.hpp"
4287 
4288 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP