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