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 struct Flag {
 228   enum Flags {
 229     // value origin
 230     DEFAULT          = 0,
 231     COMMAND_LINE     = 1,
 232     ENVIRON_VAR      = 2,
 233     CONFIG_FILE      = 3,
 234     MANAGEMENT       = 4,
 235     ERGONOMIC        = 5,
 236     ATTACH_ON_DEMAND = 6,
 237     INTERNAL         = 7,
 238 
 239     LAST_VALUE_ORIGIN = INTERNAL,
 240     VALUE_ORIGIN_BITS = 4,
 241     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 242 
 243     // flag kind
 244     KIND_PRODUCT            = 1 << 4,
 245     KIND_MANAGEABLE         = 1 << 5,
 246     KIND_DIAGNOSTIC         = 1 << 6,
 247     KIND_EXPERIMENTAL       = 1 << 7,
 248     KIND_NOT_PRODUCT        = 1 << 8,
 249     KIND_DEVELOP            = 1 << 9,
 250     KIND_PLATFORM_DEPENDENT = 1 << 10,
 251     KIND_READ_WRITE         = 1 << 11,
 252     KIND_C1                 = 1 << 12,
 253     KIND_C2                 = 1 << 13,
 254     KIND_ARCH               = 1 << 14,
 255     KIND_SHARK              = 1 << 15,
 256     KIND_LP64_PRODUCT       = 1 << 16,
 257     KIND_COMMERCIAL         = 1 << 17,
 258     KIND_JVMCI              = 1 << 18,
 259 
 260     KIND_MASK = ~VALUE_ORIGIN_MASK
 261   };
 262 
 263   enum Error {
 264     // no error
 265     SUCCESS = 0,
 266     // flag name is missing
 267     MISSING_NAME,
 268     // flag value is missing
 269     MISSING_VALUE,
 270     // error parsing the textual form of the value
 271     WRONG_FORMAT,
 272     // flag is not writeable
 273     NON_WRITABLE,
 274     // flag value is outside of its bounds
 275     OUT_OF_BOUNDS,
 276     // flag value violates its constraint
 277     VIOLATES_CONSTRAINT,
 278     // there is no flag with the given name
 279     INVALID_FLAG,
 280     // other, unspecified error related to setting the flag
 281     ERR_OTHER
 282   };
 283 
 284   enum MsgType {
 285     NONE = 0,
 286     DIAGNOSTIC_FLAG_BUT_LOCKED,
 287     EXPERIMENTAL_FLAG_BUT_LOCKED,
 288     DEVELOPER_FLAG_BUT_PRODUCT_BUILD,
 289     NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD
 290   };
 291 
 292   const char* _type;
 293   const char* _name;
 294   void* _addr;
 295   NOT_PRODUCT(const char* _doc;)
 296   Flags _flags;
 297 
 298   // points to all Flags static array
 299   static Flag* flags;
 300 
 301   // number of flags
 302   static size_t numFlags;
 303 
 304   static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); };
 305   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 306   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 307 
 308   void check_writable();
 309 
 310   bool is_bool() const;
 311   bool get_bool() const;
 312   void set_bool(bool value);
 313 
 314   bool is_int() const;
 315   int get_int() const;
 316   void set_int(int value);
 317 
 318   bool is_uint() const;
 319   uint get_uint() const;
 320   void set_uint(uint value);
 321 
 322   bool is_intx() const;
 323   intx get_intx() const;
 324   void set_intx(intx value);
 325 
 326   bool is_uintx() const;
 327   uintx get_uintx() const;
 328   void set_uintx(uintx value);
 329 
 330   bool is_uint64_t() const;
 331   uint64_t get_uint64_t() const;
 332   void set_uint64_t(uint64_t value);
 333 
 334   bool is_size_t() const;
 335   size_t get_size_t() const;
 336   void set_size_t(size_t value);
 337 
 338   bool is_double() const;
 339   double get_double() const;
 340   void set_double(double value);
 341 
 342   bool is_ccstr() const;
 343   bool ccstr_accumulates() const;
 344   ccstr get_ccstr() const;
 345   void set_ccstr(ccstr value);
 346 
 347   Flags get_origin();
 348   void set_origin(Flags origin);
 349 
 350   bool is_default();
 351   bool is_ergonomic();
 352   bool is_command_line();
 353 
 354   bool is_product() const;
 355   bool is_manageable() const;
 356   bool is_diagnostic() const;
 357   bool is_experimental() const;
 358   bool is_notproduct() const;
 359   bool is_develop() const;
 360   bool is_read_write() const;
 361   bool is_commercial() const;
 362 
 363   bool is_constant_in_binary() const;
 364 
 365   bool is_unlocker() const;
 366   bool is_unlocked() const;
 367   bool is_writeable() const;
 368   bool is_external() const;
 369 
 370   bool is_unlocker_ext() const;
 371   bool is_unlocked_ext() const;
 372   bool is_writeable_ext() const;
 373   bool is_external_ext() const;
 374 
 375   void unlock_diagnostic();
 376 
 377   Flag::MsgType get_locked_message(char*, int) const;
 378   void get_locked_message_ext(char*, int) const;
 379 
 380   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 381   void print_on(outputStream* st, bool withComments = false, bool printRanges = false);
 382   void print_kind(outputStream* st);
 383   void print_as_flag(outputStream* st);
 384 
 385   static const char* flag_error_str(Flag::Error error);
 386 };
 387 
 388 // debug flags control various aspects of the VM and are global accessible
 389 
 390 // use FlagSetting to temporarily change some debug flag
 391 // e.g. FlagSetting fs(DebugThisAndThat, true);
 392 // restored to previous value upon leaving scope
 393 class FlagSetting {
 394   bool val;
 395   bool* flag;
 396  public:
 397   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 398   ~FlagSetting()                       { *flag = val; }
 399 };
 400 
 401 
 402 class CounterSetting {
 403   intx* counter;
 404  public:
 405   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 406   ~CounterSetting()         { (*counter)--; }
 407 };
 408 
 409 class IntFlagSetting {
 410   int val;
 411   int* flag;
 412  public:
 413   IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; }
 414   ~IntFlagSetting()                     { *flag = val; }
 415 };
 416 
 417 class UIntFlagSetting {
 418   uint val;
 419   uint* flag;
 420  public:
 421   UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; }
 422   ~UIntFlagSetting()                       { *flag = val; }
 423 };
 424 
 425 class UIntXFlagSetting {
 426   uintx val;
 427   uintx* flag;
 428  public:
 429   UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 430   ~UIntXFlagSetting()                         { *flag = val; }
 431 };
 432 
 433 class DoubleFlagSetting {
 434   double val;
 435   double* flag;
 436  public:
 437   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 438   ~DoubleFlagSetting()                           { *flag = val; }
 439 };
 440 
 441 class SizeTFlagSetting {
 442   size_t val;
 443   size_t* flag;
 444  public:
 445   SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; }
 446   ~SizeTFlagSetting()                           { *flag = val; }
 447 };
 448 
 449 
 450 class CommandLineFlags {
 451 public:
 452   static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 453   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); }
 454   static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin);
 455   static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 456   static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 457 
 458   static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false);
 459   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); }
 460   static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin);
 461   static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin);
 462   static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin)   { return intAtPut(name, strlen(name), value, origin); }
 463 
 464   static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false);
 465   static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false)      { return uintAt(name, strlen(name), value, allow_locked, return_flag); }
 466   static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin);
 467   static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin);
 468   static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin)   { return uintAtPut(name, strlen(name), value, origin); }
 469 
 470   static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 471   static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false)      { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
 472   static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin);
 473   static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 474   static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 475 
 476   static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 477   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); }
 478   static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin);
 479   static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 480   static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 481 
 482   static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false);
 483   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); }
 484   static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin);
 485   static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin);
 486   static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); }
 487 
 488   static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 489   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); }
 490   static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin);
 491   static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 492   static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 493 
 494   static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 495   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); }
 496   static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin);
 497   static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 498   static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 499 
 500   static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 501   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); }
 502   // Contract:  Flag will make private copy of the incoming value.
 503   // Outgoing value is always malloc-ed, and caller MUST call free.
 504   static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 505   static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 506 
 507   // Returns false if name is not a command line flag.
 508   static bool wasSetOnCmdline(const char* name, bool* value);
 509   static void printSetFlags(outputStream* out);
 510 
 511   // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges
 512   static void printFlags(outputStream* out, bool withComments, bool printRanges = false);
 513 
 514   static void verify() PRODUCT_RETURN;
 515 };
 516 
 517 // use this for flags that are true by default in the debug version but
 518 // false in the optimized version, and vice versa
 519 #ifdef ASSERT
 520 #define trueInDebug  true
 521 #define falseInDebug false
 522 #else
 523 #define trueInDebug  false
 524 #define falseInDebug true
 525 #endif
 526 
 527 // use this for flags that are true per default in the product build
 528 // but false in development builds, and vice versa
 529 #ifdef PRODUCT
 530 #define trueInProduct  true
 531 #define falseInProduct false
 532 #else
 533 #define trueInProduct  false
 534 #define falseInProduct true
 535 #endif
 536 
 537 #ifdef JAVASE_EMBEDDED
 538 #define falseInEmbedded false
 539 #else
 540 #define falseInEmbedded true
 541 #endif
 542 
 543 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 544 // product flags are always settable / visible
 545 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 546 
 547 // A flag must be declared with one of the following types:
 548 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t.
 549 // The type "ccstr" is an alias for "const char*" and is used
 550 // only in this file, because the macrology requires single-token type names.
 551 
 552 // Note: Diagnostic options not meant for VM tuning or for product modes.
 553 // They are to be used for VM quality assurance or field diagnosis
 554 // of VM bugs.  They are hidden so that users will not be encouraged to
 555 // try them as if they were VM ordinary execution options.  However, they
 556 // are available in the product version of the VM.  Under instruction
 557 // from support engineers, VM customers can turn them on to collect
 558 // diagnostic information about VM problems.  To use a VM diagnostic
 559 // option, you must first specify +UnlockDiagnosticVMOptions.
 560 // (This master switch also affects the behavior of -Xprintflags.)
 561 //
 562 // experimental flags are in support of features that are not
 563 //    part of the officially supported product, but are available
 564 //    for experimenting with. They could, for example, be performance
 565 //    features that may not have undergone full or rigorous QA, but which may
 566 //    help performance in some cases and released for experimentation
 567 //    by the community of users and developers. This flag also allows one to
 568 //    be able to build a fully supported product that nonetheless also
 569 //    ships with some unsupported, lightly tested, experimental features.
 570 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 571 //    UnlockExperimentalVMOptions flag, which allows the control and
 572 //    modification of the experimental flags.
 573 //
 574 // Nota bene: neither diagnostic nor experimental options should be used casually,
 575 //    and they are not supported on production loads, except under explicit
 576 //    direction from support engineers.
 577 //
 578 // manageable flags are writeable external product flags.
 579 //    They are dynamically writeable through the JDK management interface
 580 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 581 //    These flags are external exported interface (see CCC).  The list of
 582 //    manageable flags can be queried programmatically through the management
 583 //    interface.
 584 //
 585 //    A flag can be made as "manageable" only if
 586 //    - the flag is defined in a CCC as an external exported interface.
 587 //    - the VM implementation supports dynamic setting of the flag.
 588 //      This implies that the VM must *always* query the flag variable
 589 //      and not reuse state related to the flag state at any given time.
 590 //    - you want the flag to be queried programmatically by the customers.
 591 //
 592 // product_rw flags are writeable internal product flags.
 593 //    They are like "manageable" flags but for internal/private use.
 594 //    The list of product_rw flags are internal/private flags which
 595 //    may be changed/removed in a future release.  It can be set
 596 //    through the management interface to get/set value
 597 //    when the name of flag is supplied.
 598 //
 599 //    A flag can be made as "product_rw" only if
 600 //    - the VM implementation supports dynamic setting of the flag.
 601 //      This implies that the VM must *always* query the flag variable
 602 //      and not reuse state related to the flag state at any given time.
 603 //
 604 // Note that when there is a need to support develop flags to be writeable,
 605 // it can be done in the same way as product_rw.
 606 //
 607 // range is a macro that will expand to min and max arguments for range
 608 //    checking code if provided - see commandLineFlagRangeList.hpp
 609 //
 610 // constraint is a macro that will expand to custom function call
 611 //    for constraint checking if provided - see commandLineFlagConstraintList.hpp
 612 //
 613 
 614 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product, range, constraint) \
 615                                                                             \
 616   lp64_product(bool, UseCompressedOops, false,                              \
 617           "Use 32-bit object references in 64-bit VM. "                     \
 618           "lp64_product means flag is always constant in 32 bit VM")        \
 619                                                                             \
 620   lp64_product(bool, UseCompressedClassPointers, false,                     \
 621           "Use 32-bit class pointers in 64-bit VM. "                        \
 622           "lp64_product means flag is always constant in 32 bit VM")        \
 623                                                                             \
 624   notproduct(bool, CheckCompressedOops, true,                               \
 625           "Generate checks in encoding/decoding code in debug VM")          \
 626                                                                             \
 627   product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17),                        \
 628           "Heap allocation steps through preferred address regions to find" \
 629           " where it can allocate the heap. Number of steps to take per "   \
 630           "region.")                                                        \
 631           range(1, max_uintx)                                               \
 632                                                                             \
 633   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 634           "Print compressed oops base address and encoding mode")           \
 635                                                                             \
 636   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 637           "Default object alignment in bytes, 8 is minimum")                \
 638           range(8, 256)                                                     \
 639           constraint(ObjectAlignmentInBytesConstraintFunc,AtParse)          \
 640                                                                             \
 641   product(bool, AssumeMP, false,                                            \
 642           "Instruct the VM to assume multiple processors are available")    \
 643                                                                             \
 644   /* UseMembar is theoretically a temp flag used for memory barrier      */ \
 645   /* removal testing.  It was supposed to be removed before FCS but has  */ \
 646   /* been re-added (see 6401008)                                         */ \
 647   product_pd(bool, UseMembar,                                               \
 648           "(Unstable) Issues membars on thread state transitions")          \
 649                                                                             \
 650   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 651           "Clean the chunk pool asynchronously")                            \
 652                                                                             \
 653   experimental(bool, AlwaysSafeConstructors, false,                         \
 654           "Force safe construction, as if all fields are final.")           \
 655                                                                             \
 656   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 657           "Enable normal processing of flags relating to field diagnostics")\
 658                                                                             \
 659   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 660           "Enable normal processing of flags relating to experimental "     \
 661           "features")                                                       \
 662                                                                             \
 663   product(bool, JavaMonitorsInStackTrace, true,                             \
 664           "Print information about Java monitor locks when the stacks are"  \
 665           "dumped")                                                         \
 666                                                                             \
 667   product_pd(bool, UseLargePages,                                           \
 668           "Use large page memory")                                          \
 669                                                                             \
 670   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 671           "Allocate large pages individually for better affinity")          \
 672                                                                             \
 673   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 674           "Fail large pages individual allocation")                         \
 675                                                                             \
 676   product(bool, UseLargePagesInMetaspace, false,                            \
 677           "Use large page memory in metaspace. "                            \
 678           "Only used if UseLargePages is enabled.")                         \
 679                                                                             \
 680   develop(bool, TracePageSizes, false,                                      \
 681           "Trace page size selection and usage")                            \
 682                                                                             \
 683   product(bool, UseNUMA, false,                                             \
 684           "Use NUMA if available")                                          \
 685                                                                             \
 686   product(bool, UseNUMAInterleaving, false,                                 \
 687           "Interleave memory across NUMA nodes if available")               \
 688                                                                             \
 689   product(size_t, NUMAInterleaveGranularity, 2*M,                           \
 690           "Granularity to use for NUMA interleaving on Windows OS")         \
 691           range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \
 692                                                                             \
 693   product(bool, ForceNUMA, false,                                           \
 694           "Force NUMA optimizations on single-node/UMA systems")            \
 695                                                                             \
 696   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 697           "Percentage (0-100) used to weight the current sample when "      \
 698           "computing exponentially decaying average for "                   \
 699           "AdaptiveNUMAChunkSizing")                                        \
 700           range(0, 100)                                                     \
 701                                                                             \
 702   product(size_t, NUMASpaceResizeRate, 1*G,                                 \
 703           "Do not reallocate more than this amount per collection")         \
 704           range(0, max_uintx)                                               \
 705                                                                             \
 706   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 707           "Enable adaptive chunk sizing for NUMA")                          \
 708                                                                             \
 709   product(bool, NUMAStats, false,                                           \
 710           "Print NUMA stats in detailed heap information")                  \
 711                                                                             \
 712   product(uintx, NUMAPageScanRate, 256,                                     \
 713           "Maximum number of pages to include in the page scan procedure")  \
 714           range(0, max_uintx)                                               \
 715                                                                             \
 716   product_pd(bool, NeedsDeoptSuspend,                                       \
 717           "True for register window machines (sparc/ia64)")                 \
 718                                                                             \
 719   product(intx, UseSSE, 99,                                                 \
 720           "Highest supported SSE instructions set on x86/x64")              \
 721           range(0, 99)                                                      \
 722                                                                             \
 723   product(bool, UseAES, false,                                              \
 724           "Control whether AES instructions can be used on x86/x64")        \
 725                                                                             \
 726   product(bool, UseSHA, false,                                              \
 727           "Control whether SHA instructions can be used "                   \
 728           "on SPARC and on ARM")                                            \
 729                                                                             \
 730   product(bool, UseGHASHIntrinsics, false,                                  \
 731           "Use intrinsics for GHASH versions of crypto")                    \
 732                                                                             \
 733   product(size_t, LargePageSizeInBytes, 0,                                  \
 734           "Large page size (0 to let VM choose the page size)")             \
 735           range(0, max_uintx)                                               \
 736                                                                             \
 737   product(size_t, LargePageHeapSizeThreshold, 128*M,                        \
 738           "Use large pages if maximum heap is at least this big")           \
 739           range(0, max_uintx)                                               \
 740                                                                             \
 741   product(bool, ForceTimeHighResolution, false,                             \
 742           "Using high time resolution (for Win32 only)")                    \
 743                                                                             \
 744   develop(bool, TracePcPatching, false,                                     \
 745           "Trace usage of frame::patch_pc")                                 \
 746                                                                             \
 747   develop(bool, TraceJumps, false,                                          \
 748           "Trace assembly jumps in thread ring buffer")                     \
 749                                                                             \
 750   develop(bool, TraceRelocator, false,                                      \
 751           "Trace the bytecode relocator")                                   \
 752                                                                             \
 753   develop(bool, TraceLongCompiles, false,                                   \
 754           "Print out every time compilation is longer than "                \
 755           "a given threshold")                                              \
 756                                                                             \
 757   develop(bool, SafepointALot, false,                                       \
 758           "Generate a lot of safepoints. This works with "                  \
 759           "GuaranteedSafepointInterval")                                    \
 760                                                                             \
 761   product_pd(bool, BackgroundCompilation,                                   \
 762           "A thread requesting compilation is not blocked during "          \
 763           "compilation")                                                    \
 764                                                                             \
 765   product(bool, PrintVMQWaitTime, false,                                    \
 766           "Print out the waiting time in VM operation queue")               \
 767                                                                             \
 768   develop(bool, TraceOopMapGeneration, false,                               \
 769           "Show OopMapGeneration")                                          \
 770                                                                             \
 771   product(bool, MethodFlushing, true,                                       \
 772           "Reclamation of zombie and not-entrant methods")                  \
 773                                                                             \
 774   develop(bool, VerifyStack, false,                                         \
 775           "Verify stack of each thread when it is entering a runtime call") \
 776                                                                             \
 777   diagnostic(bool, ForceUnreachable, false,                                 \
 778           "Make all non code cache addresses to be unreachable by "         \
 779           "forcing use of 64bit literal fixups")                            \
 780                                                                             \
 781   notproduct(bool, StressDerivedPointers, false,                            \
 782           "Force scavenge when a derived pointer is detected on stack "     \
 783           "after rtm call")                                                 \
 784                                                                             \
 785   develop(bool, TraceDerivedPointers, false,                                \
 786           "Trace traversal of derived pointers on stack")                   \
 787                                                                             \
 788   notproduct(bool, TraceCodeBlobStacks, false,                              \
 789           "Trace stack-walk of codeblobs")                                  \
 790                                                                             \
 791   product(bool, PrintJNIResolving, false,                                   \
 792           "Used to implement -v:jni")                                       \
 793                                                                             \
 794   notproduct(bool, PrintRewrites, false,                                    \
 795           "Print methods that are being rewritten")                         \
 796                                                                             \
 797   product(bool, UseInlineCaches, true,                                      \
 798           "Use Inline Caches for virtual calls ")                           \
 799                                                                             \
 800   develop(bool, InlineArrayCopy, true,                                      \
 801           "Inline arraycopy native that is known to be part of "            \
 802           "base library DLL")                                               \
 803                                                                             \
 804   develop(bool, InlineObjectHash, true,                                     \
 805           "Inline Object::hashCode() native that is known to be part "      \
 806           "of base library DLL")                                            \
 807                                                                             \
 808   develop(bool, InlineNatives, true,                                        \
 809           "Inline natives that are known to be part of base library DLL")   \
 810                                                                             \
 811   develop(bool, InlineMathNatives, true,                                    \
 812           "Inline SinD, CosD, etc.")                                        \
 813                                                                             \
 814   develop(bool, InlineClassNatives, true,                                   \
 815           "Inline Class.isInstance, etc")                                   \
 816                                                                             \
 817   develop(bool, InlineThreadNatives, true,                                  \
 818           "Inline Thread.currentThread, etc")                               \
 819                                                                             \
 820   develop(bool, InlineUnsafeOps, true,                                      \
 821           "Inline memory ops (native methods) from Unsafe")                 \
 822                                                                             \
 823   product(bool, CriticalJNINatives, true,                                   \
 824           "Check for critical JNI entry points")                            \
 825                                                                             \
 826   notproduct(bool, StressCriticalJNINatives, false,                         \
 827           "Exercise register saving code in critical natives")              \
 828                                                                             \
 829   product(bool, UseSSE42Intrinsics, false,                                  \
 830           "SSE4.2 versions of intrinsics")                                  \
 831                                                                             \
 832   product(bool, UseAESIntrinsics, false,                                    \
 833           "Use intrinsics for AES versions of crypto")                      \
 834                                                                             \
 835   product(bool, UseAESCTRIntrinsics, false,                                 \
 836           "Use intrinsics for the paralleled version of AES/CTR crypto")    \
 837                                                                             \
 838   product(bool, UseSHA1Intrinsics, false,                                   \
 839           "Use intrinsics for SHA-1 crypto hash function. "                 \
 840           "Requires that UseSHA is enabled.")                               \
 841                                                                             \
 842   product(bool, UseSHA256Intrinsics, false,                                 \
 843           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. "  \
 844           "Requires that UseSHA is enabled.")                               \
 845                                                                             \
 846   product(bool, UseSHA512Intrinsics, false,                                 \
 847           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. "  \
 848           "Requires that UseSHA is enabled.")                               \
 849                                                                             \
 850   product(bool, UseCRC32Intrinsics, false,                                  \
 851           "use intrinsics for java.util.zip.CRC32")                         \
 852                                                                             \
 853   product(bool, UseCRC32CIntrinsics, false,                                 \
 854           "use intrinsics for java.util.zip.CRC32C")                        \
 855                                                                             \
 856   product(bool, UseAdler32Intrinsics, false,                                \
 857           "use intrinsics for java.util.zip.Adler32")                       \
 858                                                                             \
 859   product(bool, UseVectorizedMismatchIntrinsic, false,                      \
 860           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
 861                                                                             \
 862   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
 863          "do not expand intrinsics whose (internal) names appear here")     \
 864                                                                             \
 865   develop(bool, TraceCallFixup, false,                                      \
 866           "Trace all call fixups")                                          \
 867                                                                             \
 868   develop(bool, DeoptimizeALot, false,                                      \
 869           "Deoptimize at every exit from the runtime system")               \
 870                                                                             \
 871   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 872           "A comma separated list of bcis to deoptimize at")                \
 873                                                                             \
 874   product(bool, DeoptimizeRandom, false,                                    \
 875           "Deoptimize random frames on random exit from the runtime system")\
 876                                                                             \
 877   notproduct(bool, ZombieALot, false,                                       \
 878           "Create zombies (non-entrant) at exit from the runtime system")   \
 879                                                                             \
 880   product(bool, UnlinkSymbolsALot, false,                                   \
 881           "Unlink unreferenced symbols from the symbol table at safepoints")\
 882                                                                             \
 883   notproduct(bool, WalkStackALot, false,                                    \
 884           "Trace stack (no print) at every exit from the runtime system")   \
 885                                                                             \
 886   product(bool, Debugging, false,                                           \
 887           "Set when executing debug methods in debug.cpp "                  \
 888           "(to prevent triggering assertions)")                             \
 889                                                                             \
 890   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 891           "Enable strict checks that safepoints cannot happen for threads " \
 892           "that use NoSafepointVerifier")                                   \
 893                                                                             \
 894   notproduct(bool, VerifyLastFrame, false,                                  \
 895           "Verify oops on last frame on entry to VM")                       \
 896                                                                             \
 897   develop(bool, TraceHandleAllocation, false,                               \
 898           "Print out warnings when suspiciously many handles are allocated")\
 899                                                                             \
 900   product(bool, FailOverToOldVerifier, true,                                \
 901           "Fail over to old verifier when split verifier fails")            \
 902                                                                             \
 903   develop(bool, ShowSafepointMsgs, false,                                   \
 904           "Show message about safepoint synchronization")                   \
 905                                                                             \
 906   product(bool, SafepointTimeout, false,                                    \
 907           "Time out and warn or fail after SafepointTimeoutDelay "          \
 908           "milliseconds if failed to reach safepoint")                      \
 909                                                                             \
 910   develop(bool, DieOnSafepointTimeout, false,                               \
 911           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 912                                                                             \
 913   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 914   /* typically, at most a few retries are needed                    */      \
 915   product(intx, SuspendRetryCount, 50,                                      \
 916           "Maximum retry count for an external suspend request")            \
 917           range(0, max_intx)                                                \
 918                                                                             \
 919   product(intx, SuspendRetryDelay, 5,                                       \
 920           "Milliseconds to delay per retry (* current_retry_count)")        \
 921           range(0, max_intx)                                                \
 922                                                                             \
 923   product(bool, AssertOnSuspendWaitFailure, false,                          \
 924           "Assert/Guarantee on external suspend wait failure")              \
 925                                                                             \
 926   product(bool, TraceSuspendWaitFailures, false,                            \
 927           "Trace external suspend wait failures")                           \
 928                                                                             \
 929   product(bool, MaxFDLimit, true,                                           \
 930           "Bump the number of file descriptors to maximum in Solaris")      \
 931                                                                             \
 932   diagnostic(bool, LogEvents, true,                                         \
 933           "Enable the various ring buffer event logs")                      \
 934                                                                             \
 935   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 936           "Number of ring buffer event logs")                               \
 937           range(1, NOT_LP64(1*K) LP64_ONLY(1*M))                            \
 938                                                                             \
 939   product(bool, BytecodeVerificationRemote, true,                           \
 940           "Enable the Java bytecode verifier for remote classes")           \
 941                                                                             \
 942   product(bool, BytecodeVerificationLocal, false,                           \
 943           "Enable the Java bytecode verifier for local classes")            \
 944                                                                             \
 945   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 946           "Force exceptions on FP stack under/overflow")                    \
 947                                                                             \
 948   develop(bool, VerifyStackAtCalls, false,                                  \
 949           "Verify that the stack pointer is unchanged after calls")         \
 950                                                                             \
 951   develop(bool, TraceJavaAssertions, false,                                 \
 952           "Trace java language assertions")                                 \
 953                                                                             \
 954   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 955           "Temporary - see javaClasses.cpp")                                \
 956                                                                             \
 957   notproduct(bool, PrintMallocFree, false,                                  \
 958           "Trace calls to C heap malloc/free allocation")                   \
 959                                                                             \
 960   product(bool, PrintOopAddress, false,                                     \
 961           "Always print the location of the oop")                           \
 962                                                                             \
 963   notproduct(bool, VerifyCodeCache, false,                                  \
 964           "Verify code cache on memory allocation/deallocation")            \
 965                                                                             \
 966   develop(bool, UseMallocOnly, false,                                       \
 967           "Use only malloc/free for allocation (no resource area/arena)")   \
 968                                                                             \
 969   develop(bool, PrintMalloc, false,                                         \
 970           "Print all malloc/free calls")                                    \
 971                                                                             \
 972   develop(bool, PrintMallocStatistics, false,                               \
 973           "Print malloc/free statistics")                                   \
 974                                                                             \
 975   develop(bool, ZapResourceArea, trueInDebug,                               \
 976           "Zap freed resource/arena space with 0xABABABAB")                 \
 977                                                                             \
 978   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 979           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 980                                                                             \
 981   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 982           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 983                                                                             \
 984   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 985           "Zap allocated/freed stack segments with 0xFADFADED")             \
 986                                                                             \
 987   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 988           "Zap unused heap space with 0xBAADBABE")                          \
 989                                                                             \
 990   develop(bool, CheckZapUnusedHeapArea, false,                              \
 991           "Check zapping of unused heap space")                             \
 992                                                                             \
 993   develop(bool, ZapFillerObjects, trueInDebug,                              \
 994           "Zap filler objects with 0xDEAFBABE")                             \
 995                                                                             \
 996   develop(bool, PrintVMMessages, true,                                      \
 997           "Print VM messages on console")                                   \
 998                                                                             \
 999   diagnostic(bool, VerboseVerification, false,                              \
1000           "Display detailed verification details")                          \
1001                                                                             \
1002   notproduct(uintx, ErrorHandlerTest, 0,                                    \
1003           "If > 0, provokes an error after VM initialization; the value "   \
1004           "determines which error to provoke. See test_error_handler() "    \
1005           "in debug.cpp.")                                                  \
1006                                                                             \
1007   notproduct(uintx, TestCrashInErrorHandler, 0,                             \
1008           "If > 0, provokes an error inside VM error handler (a secondary " \
1009           "crash). see test_error_handler() in debug.cpp.")                 \
1010                                                                             \
1011   notproduct(bool, TestSafeFetchInErrorHandler, false,                      \
1012           "If true, tests SafeFetch inside error handler.")                 \
1013                                                                             \
1014   develop(bool, Verbose, false,                                             \
1015           "Print additional debugging information from other modes")        \
1016                                                                             \
1017   develop(bool, PrintMiscellaneous, false,                                  \
1018           "Print uncategorized debugging information (requires +Verbose)")  \
1019                                                                             \
1020   develop(bool, WizardMode, false,                                          \
1021           "Print much more debugging information")                          \
1022                                                                             \
1023   product(bool, ShowMessageBoxOnError, false,                               \
1024           "Keep process alive on VM fatal error")                           \
1025                                                                             \
1026   product(bool, CreateCoredumpOnCrash, true,                                \
1027           "Create core/mini dump on VM fatal error")                        \
1028                                                                             \
1029   product(uint64_t, ErrorLogTimeout, 2 * 60,                                \
1030           "Timeout, in seconds, to limit the time spent on writing an "     \
1031           "error log in case of a crash.")                                  \
1032           range(0, (uint64_t)max_jlong/1000)                                \
1033                                                                             \
1034   product_pd(bool, UseOSErrorReporting,                                     \
1035           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
1036                                                                             \
1037   product(bool, SuppressFatalErrorMessage, false,                           \
1038           "Report NO fatal error message (avoid deadlock)")                 \
1039                                                                             \
1040   product(ccstrlist, OnError, "",                                           \
1041           "Run user-defined commands on fatal error; see VMError.cpp "      \
1042           "for examples")                                                   \
1043                                                                             \
1044   product(ccstrlist, OnOutOfMemoryError, "",                                \
1045           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
1046                                                                             \
1047   manageable(bool, HeapDumpBeforeFullGC, false,                             \
1048           "Dump heap to file before any major stop-the-world GC")           \
1049                                                                             \
1050   manageable(bool, HeapDumpAfterFullGC, false,                              \
1051           "Dump heap to file after any major stop-the-world GC")            \
1052                                                                             \
1053   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
1054           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
1055                                                                             \
1056   manageable(ccstr, HeapDumpPath, NULL,                                     \
1057           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
1058           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
1059           "in the working directory)")                                      \
1060                                                                             \
1061   develop(size_t, SegmentedHeapDumpThreshold, 2*G,                          \
1062           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
1063           "when the heap usage is larger than this")                        \
1064                                                                             \
1065   develop(size_t, HeapDumpSegmentSize, 1*G,                                 \
1066           "Approximate segment size when generating a segmented heap dump") \
1067                                                                             \
1068   develop(bool, BreakAtWarning, false,                                      \
1069           "Execute breakpoint upon encountering VM warning")                \
1070                                                                             \
1071   develop(bool, UseFakeTimers, false,                                       \
1072           "Tell whether the VM should use system time or a fake timer")     \
1073                                                                             \
1074   product(ccstr, NativeMemoryTracking, "off",                               \
1075           "Native memory tracking options")                                 \
1076                                                                             \
1077   diagnostic(bool, PrintNMTStatistics, false,                               \
1078           "Print native memory tracking summary data if it is on")          \
1079                                                                             \
1080   diagnostic(bool, LogCompilation, false,                                   \
1081           "Log compilation activity in detail to LogFile")                  \
1082                                                                             \
1083   product(bool, PrintCompilation, false,                                    \
1084           "Print compilations")                                             \
1085                                                                             \
1086   diagnostic(bool, TraceNMethodInstalls, false,                             \
1087           "Trace nmethod installation")                                     \
1088                                                                             \
1089   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
1090           "0: do not allow scavengable oops in the code cache; "            \
1091           "1: allow scavenging from the code cache; "                       \
1092           "2: emit as many constants as the compiler can see")              \
1093           range(0, 2)                                                       \
1094                                                                             \
1095   product(bool, AlwaysRestoreFPU, false,                                    \
1096           "Restore the FPU control word after every JNI call (expensive)")  \
1097                                                                             \
1098   diagnostic(bool, PrintCompilation2, false,                                \
1099           "Print additional statistics per compilation")                    \
1100                                                                             \
1101   diagnostic(bool, PrintAdapterHandlers, false,                             \
1102           "Print code generated for i2c/c2i adapters")                      \
1103                                                                             \
1104   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
1105           "Verify that i2c/c2i adapters are called properly")               \
1106                                                                             \
1107   develop(bool, VerifyAdapterSharing, false,                                \
1108           "Verify that the code for shared adapters is the equivalent")     \
1109                                                                             \
1110   diagnostic(bool, PrintAssembly, false,                                    \
1111           "Print assembly code (using external disassembler.so)")           \
1112                                                                             \
1113   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1114           "Print options string passed to disassembler.so")                 \
1115                                                                             \
1116   notproduct(bool, PrintNMethodStatistics, false,                           \
1117           "Print a summary statistic for the generated nmethods")           \
1118                                                                             \
1119   diagnostic(bool, PrintNMethods, false,                                    \
1120           "Print assembly code for nmethods when generated")                \
1121                                                                             \
1122   diagnostic(bool, PrintNativeNMethods, false,                              \
1123           "Print assembly code for native nmethods when generated")         \
1124                                                                             \
1125   develop(bool, PrintDebugInfo, false,                                      \
1126           "Print debug information for all nmethods when generated")        \
1127                                                                             \
1128   develop(bool, PrintRelocations, false,                                    \
1129           "Print relocation information for all nmethods when generated")   \
1130                                                                             \
1131   develop(bool, PrintDependencies, false,                                   \
1132           "Print dependency information for all nmethods when generated")   \
1133                                                                             \
1134   develop(bool, PrintExceptionHandlers, false,                              \
1135           "Print exception handler tables for all nmethods when generated") \
1136                                                                             \
1137   develop(bool, StressCompiledExceptionHandlers, false,                     \
1138           "Exercise compiled exception handlers")                           \
1139                                                                             \
1140   develop(bool, InterceptOSException, false,                                \
1141           "Start debugger when an implicit OS (e.g. NULL) "                 \
1142           "exception happens")                                              \
1143                                                                             \
1144   product(bool, PrintCodeCache, false,                                      \
1145           "Print the code cache memory usage when exiting")                 \
1146                                                                             \
1147   develop(bool, PrintCodeCache2, false,                                     \
1148           "Print detailed usage information on the code cache when exiting")\
1149                                                                             \
1150   product(bool, PrintCodeCacheOnCompilation, false,                         \
1151           "Print the code cache memory usage each time a method is "        \
1152           "compiled")                                                       \
1153                                                                             \
1154   diagnostic(bool, PrintStubCode, false,                                    \
1155           "Print generated stub code")                                      \
1156                                                                             \
1157   product(bool, StackTraceInThrowable, true,                                \
1158           "Collect backtrace in throwable when exception happens")          \
1159                                                                             \
1160   product(bool, OmitStackTraceInFastThrow, true,                            \
1161           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1162                                                                             \
1163   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1164           "Print bytecode statistics when dumping profiler output")         \
1165                                                                             \
1166   product(bool, ProfilerRecordPC, false,                                    \
1167           "Collect ticks for each 16 byte interval of compiled code")       \
1168                                                                             \
1169   product(bool, ProfileVM, false,                                           \
1170           "Profile ticks that fall within VM (either in the VM Thread "     \
1171           "or VM code called through stubs)")                               \
1172                                                                             \
1173   product(bool, ProfileIntervals, false,                                    \
1174           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1175                                                                             \
1176   notproduct(bool, ProfilerCheckIntervals, false,                           \
1177           "Collect and print information on spacing of profiler ticks")     \
1178                                                                             \
1179   product(bool, PrintWarnings, true,                                        \
1180           "Print JVM warnings to output stream")                            \
1181                                                                             \
1182   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1183           "Print warnings for stalled SpinLocks")                           \
1184                                                                             \
1185   product(bool, RegisterFinalizersAtInit, true,                             \
1186           "Register finalizable objects at end of Object.<init> or "        \
1187           "after allocation")                                               \
1188                                                                             \
1189   develop(bool, RegisterReferences, true,                                   \
1190           "Tell whether the VM should register soft/weak/final/phantom "    \
1191           "references")                                                     \
1192                                                                             \
1193   develop(bool, IgnoreRewrites, false,                                      \
1194           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1195           "This is unsafe!")                                                \
1196                                                                             \
1197   develop(bool, PrintCodeCacheExtension, false,                             \
1198           "Print extension of code cache")                                  \
1199                                                                             \
1200   develop(bool, UsePrivilegedStack, true,                                   \
1201           "Enable the security JVM functions")                              \
1202                                                                             \
1203   develop(bool, ProtectionDomainVerification, true,                         \
1204           "Verify protection domain before resolution in system dictionary")\
1205                                                                             \
1206   product(bool, ClassUnloading, true,                                       \
1207           "Do unloading of classes")                                        \
1208                                                                             \
1209   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1210           "Do unloading of classes with a concurrent marking cycle")        \
1211                                                                             \
1212   develop(bool, DisableStartThread, false,                                  \
1213           "Disable starting of additional Java threads "                    \
1214           "(for debugging only)")                                           \
1215                                                                             \
1216   develop(bool, MemProfiling, false,                                        \
1217           "Write memory usage profiling to log file")                       \
1218                                                                             \
1219   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1220           "Print the system dictionary at exit")                            \
1221                                                                             \
1222   experimental(intx, PredictedLoadedClassCount, 0,                          \
1223           "Experimental: Tune loaded class cache starting size")            \
1224                                                                             \
1225   diagnostic(bool, UnsyncloadClass, false,                                  \
1226           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1227           "class loader must call VM synchronized for findClass "           \
1228           "and defineClass.")                                               \
1229                                                                             \
1230   product(bool, AlwaysLockClassLoader, false,                               \
1231           "Require the VM to acquire the class loader lock before calling " \
1232           "loadClass() even for class loaders registering "                 \
1233           "as parallel capable")                                            \
1234                                                                             \
1235   product(bool, AllowParallelDefineClass, false,                            \
1236           "Allow parallel defineClass requests for class loaders "          \
1237           "registering as parallel capable")                                \
1238                                                                             \
1239   product(bool, MustCallLoadClassInternal, false,                           \
1240           "Call loadClassInternal() rather than loadClass()")               \
1241                                                                             \
1242   product_pd(bool, DontYieldALot,                                           \
1243           "Throw away obvious excess yield calls")                          \
1244                                                                             \
1245   product_pd(bool, ConvertSleepToYield,                                     \
1246           "Convert sleep(0) to thread yield "                               \
1247           "(may be off for Solaris to improve GUI)")                        \
1248                                                                             \
1249   product(bool, ConvertYieldToSleep, false,                                 \
1250           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1251           "behavior")                                                       \
1252                                                                             \
1253   develop(bool, UseDetachedThreads, true,                                   \
1254           "Use detached threads that are recycled upon termination "        \
1255           "(for Solaris only)")                                             \
1256                                                                             \
1257   product(bool, UseLWPSynchronization, true,                                \
1258           "Use LWP-based instead of libthread-based synchronization "       \
1259           "(SPARC only)")                                                   \
1260                                                                             \
1261   experimental(ccstr, SyncKnobs, NULL,                                      \
1262                "(Unstable) Various monitor synchronization tunables")       \
1263                                                                             \
1264   experimental(intx, EmitSync, 0,                                           \
1265                "(Unsafe, Unstable) "                                        \
1266                "Control emission of inline sync fast-path code")            \
1267                                                                             \
1268   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1269           range(0, max_jint)                                                \
1270                                                                             \
1271   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1272                                                                             \
1273   experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) "                    \
1274                "Experimental Sync flags")                                   \
1275                                                                             \
1276   experimental(intx, SyncVerbose, 0, "(Unstable)")                          \
1277                                                                             \
1278   diagnostic(bool, InlineNotify, true, "intrinsify subset of notify")       \
1279                                                                             \
1280   experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")               \
1281                                                                             \
1282   experimental(intx, hashCode, 5,                                           \
1283                "(Unstable) select hashCode generation algorithm")           \
1284                                                                             \
1285   experimental(intx, WorkAroundNPTLTimedWaitHang, 0,                        \
1286                "(Unstable, Linux-specific) "                                \
1287                "avoid NPTL-FUTEX hang pthread_cond_timedwait")              \
1288                                                                             \
1289   product(bool, FilterSpuriousWakeups, true,                                \
1290           "When true prevents OS-level spurious, or premature, wakeups "    \
1291           "from Object.wait (Ignored for Windows)")                         \
1292                                                                             \
1293   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1294                                                                             \
1295   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1296                                                                             \
1297   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1298                                                                             \
1299   develop(bool, UsePthreads, false,                                         \
1300           "Use pthread-based instead of libthread-based synchronization "   \
1301           "(SPARC only)")                                                   \
1302                                                                             \
1303   product(bool, ReduceSignalUsage, false,                                   \
1304           "Reduce the use of OS signals in Java and/or the VM")             \
1305                                                                             \
1306   experimental(bool, UseCpuAllocPath, false,                                \
1307                "Use CPU_ALLOC code path in os::active_processor_count "     \
1308                "(Linux only)")                                              \
1309                                                                             \
1310   develop_pd(bool, ShareVtableStubs,                                        \
1311           "Share vtable stubs (smaller code but worse branch prediction")   \
1312                                                                             \
1313   develop(bool, LoadLineNumberTables, true,                                 \
1314           "Tell whether the class file parser loads line number tables")    \
1315                                                                             \
1316   develop(bool, LoadLocalVariableTables, true,                              \
1317           "Tell whether the class file parser loads local variable tables") \
1318                                                                             \
1319   develop(bool, LoadLocalVariableTypeTables, true,                          \
1320           "Tell whether the class file parser loads local variable type"    \
1321           "tables")                                                         \
1322                                                                             \
1323   product(bool, AllowUserSignalHandlers, false,                             \
1324           "Do not complain if the application installs signal handlers "    \
1325           "(Solaris & Linux only)")                                         \
1326                                                                             \
1327   product(bool, UseSignalChaining, true,                                    \
1328           "Use signal-chaining to invoke signal handlers installed "        \
1329           "by the application (Solaris & Linux only)")                      \
1330                                                                             \
1331   product(bool, AllowJNIEnvProxy, false,                                    \
1332           "Allow JNIEnv proxies for jdbx")                                  \
1333                                                                             \
1334   product(bool, RestoreMXCSROnJNICalls, false,                              \
1335           "Restore MXCSR when returning from JNI calls")                    \
1336                                                                             \
1337   product(bool, CheckJNICalls, false,                                       \
1338           "Verify all arguments to JNI calls")                              \
1339                                                                             \
1340   product(bool, CheckEndorsedAndExtDirs, false,                             \
1341           "Verify the endorsed and extension directories are not used")     \
1342                                                                             \
1343   product(bool, UseFastJNIAccessors, true,                                  \
1344           "Use optimized versions of Get<Primitive>Field")                  \
1345                                                                             \
1346   product(intx, MaxJNILocalCapacity, 65536,                                 \
1347           "Maximum allowable local JNI handle capacity to "                 \
1348           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1349           "where <= 0 is unlimited, default: 65536")                        \
1350           range(min_intx, max_intx)                                         \
1351                                                                             \
1352   product(bool, EagerXrunInit, false,                                       \
1353           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1354           "but not all -Xrun libraries may support the state of the VM "    \
1355           "at this time")                                                   \
1356                                                                             \
1357   product(bool, PreserveAllAnnotations, false,                              \
1358           "Preserve RuntimeInvisibleAnnotations as well "                   \
1359           "as RuntimeVisibleAnnotations")                                   \
1360                                                                             \
1361   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1362           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1363                                                                             \
1364   product(bool, UseXMMForArrayCopy, false,                                  \
1365           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1366                                                                             \
1367   product(intx, FieldsAllocationStyle, 1,                                   \
1368           "0 - type based with oops first, "                                \
1369           "1 - with oops last, "                                            \
1370           "2 - oops in super and sub classes are together")                 \
1371           range(0, 2)                                                       \
1372                                                                             \
1373   product(bool, CompactFields, true,                                        \
1374           "Allocate nonstatic fields in gaps between previous fields")      \
1375                                                                             \
1376   notproduct(bool, PrintFieldLayout, false,                                 \
1377           "Print field layout for each class")                              \
1378                                                                             \
1379   /* Need to limit the extent of the padding to reasonable size.          */\
1380   /* 8K is well beyond the reasonable HW cache line size, even with       */\
1381   /* aggressive prefetching, while still leaving the room for segregating */\
1382   /* among the distinct pages.                                            */\
1383   product(intx, ContendedPaddingWidth, 128,                                 \
1384           "How many bytes to pad the fields/classes marked @Contended with")\
1385           range(0, 8192)                                                    \
1386           constraint(ContendedPaddingWidthConstraintFunc,AfterErgo)         \
1387                                                                             \
1388   product(bool, EnableContended, true,                                      \
1389           "Enable @Contended annotation support")                           \
1390                                                                             \
1391   product(bool, RestrictContended, true,                                    \
1392           "Restrict @Contended to trusted classes")                         \
1393                                                                             \
1394   product(bool, UseBiasedLocking, true,                                     \
1395           "Enable biased locking in JVM")                                   \
1396                                                                             \
1397   product(intx, BiasedLockingStartupDelay, 4000,                            \
1398           "Number of milliseconds to wait before enabling biased locking")  \
1399           range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \
1400           constraint(BiasedLockingStartupDelayFunc,AfterErgo)               \
1401                                                                             \
1402   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1403           "Print statistics of biased locking in JVM")                      \
1404                                                                             \
1405   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1406           "Threshold of number of revocations per type to try to "          \
1407           "rebias all objects in the heap of that type")                    \
1408           range(0, max_intx)                                                \
1409           constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo)        \
1410                                                                             \
1411   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1412           "Threshold of number of revocations per type to permanently "     \
1413           "revoke biases of all objects in the heap of that type")          \
1414           range(0, max_intx)                                                \
1415           constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo)        \
1416                                                                             \
1417   product(intx, BiasedLockingDecayTime, 25000,                              \
1418           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1419           "type after previous bulk rebias")                                \
1420           range(500, max_intx)                                              \
1421           constraint(BiasedLockingDecayTimeFunc,AfterErgo)                  \
1422                                                                             \
1423   product(bool, ExitOnOutOfMemoryError, false,                              \
1424           "JVM exits on the first occurrence of an out-of-memory error")    \
1425                                                                             \
1426   product(bool, CrashOnOutOfMemoryError, false,                             \
1427           "JVM aborts, producing an error log and core/mini dump, on the "  \
1428           "first occurrence of an out-of-memory error")                     \
1429                                                                             \
1430   /* tracing */                                                             \
1431                                                                             \
1432   develop(bool, StressRewriter, false,                                      \
1433           "Stress linktime bytecode rewriting")                             \
1434                                                                             \
1435   product(ccstr, TraceJVMTI, NULL,                                          \
1436           "Trace flags for JVMTI functions and events")                     \
1437                                                                             \
1438   /* This option can change an EMCP method into an obsolete method. */      \
1439   /* This can affect tests that except specific methods to be EMCP. */      \
1440   /* This option should be used with caution.                       */      \
1441   product(bool, StressLdcRewrite, false,                                    \
1442           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1443                                                                             \
1444   product(uintx, TraceRedefineClasses, 0,                                   \
1445           "Trace level for JVMTI RedefineClasses")                          \
1446           range(0, 0xFFFFFFFF)                                              \
1447                                                                             \
1448   /* change to false by default sometime after Mustang */                   \
1449   product(bool, VerifyMergedCPBytecodes, true,                              \
1450           "Verify bytecodes after RedefineClasses constant pool merging")   \
1451                                                                             \
1452   develop(bool, TraceJNIHandleAllocation, false,                            \
1453           "Trace allocation/deallocation of JNI handle blocks")             \
1454                                                                             \
1455   develop(bool, TraceBytecodes, false,                                      \
1456           "Trace bytecode execution")                                       \
1457                                                                             \
1458   develop(bool, TraceICs, false,                                            \
1459           "Trace inline cache changes")                                     \
1460                                                                             \
1461   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1462           "Trace method invocation counter overflow")                       \
1463                                                                             \
1464   develop(bool, TraceInlineCacheClearing, false,                            \
1465           "Trace clearing of inline caches in nmethods")                    \
1466                                                                             \
1467   develop(bool, TraceDependencies, false,                                   \
1468           "Trace dependencies")                                             \
1469                                                                             \
1470   develop(bool, VerifyDependencies, trueInDebug,                            \
1471           "Exercise and verify the compilation dependency mechanism")       \
1472                                                                             \
1473   develop(bool, TraceNewOopMapGeneration, false,                            \
1474           "Trace OopMapGeneration")                                         \
1475                                                                             \
1476   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1477           "Trace OopMapGeneration: print detailed cell states")             \
1478                                                                             \
1479   develop(bool, TimeOopMap, false,                                          \
1480           "Time calls to GenerateOopMap::compute_map() in sum")             \
1481                                                                             \
1482   develop(bool, TimeOopMap2, false,                                         \
1483           "Time calls to GenerateOopMap::compute_map() individually")       \
1484                                                                             \
1485   develop(bool, TraceMonitorMismatch, false,                                \
1486           "Trace monitor matching failures during OopMapGeneration")        \
1487                                                                             \
1488   develop(bool, TraceOopMapRewrites, false,                                 \
1489           "Trace rewriting of method oops during oop map generation")       \
1490                                                                             \
1491   develop(bool, TraceICBuffer, false,                                       \
1492           "Trace usage of IC buffer")                                       \
1493                                                                             \
1494   develop(bool, TraceCompiledIC, false,                                     \
1495           "Trace changes of compiled IC")                                   \
1496                                                                             \
1497   develop(bool, TraceStartupTime, false,                                    \
1498           "Trace setup time")                                               \
1499                                                                             \
1500   develop(bool, TraceProtectionDomainVerification, false,                   \
1501           "Trace protection domain verification")                           \
1502                                                                             \
1503   develop(bool, TraceClearedExceptions, false,                              \
1504           "Print when an exception is forcibly cleared")                    \
1505                                                                             \
1506   product(bool, TraceBiasedLocking, false,                                  \
1507           "Trace biased locking in JVM")                                    \
1508                                                                             \
1509   /* gc */                                                                  \
1510                                                                             \
1511   product(bool, UseSerialGC, false,                                         \
1512           "Use the Serial garbage collector")                               \
1513                                                                             \
1514   product(bool, UseG1GC, false,                                             \
1515           "Use the Garbage-First garbage collector")                        \
1516                                                                             \
1517   product(bool, UseParallelGC, false,                                       \
1518           "Use the Parallel Scavenge garbage collector")                    \
1519                                                                             \
1520   product(bool, UseParallelOldGC, false,                                    \
1521           "Use the Parallel Old garbage collector")                         \
1522                                                                             \
1523   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1524           "How often should we maximally compact the heap (not allowing "   \
1525           "any dead space)")                                                \
1526           range(0, max_uintx)                                               \
1527                                                                             \
1528   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1529           "The collection count for the first maximum compaction")          \
1530           range(0, max_uintx)                                               \
1531                                                                             \
1532   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1533           "Use maximum compaction in the Parallel Old garbage collector "   \
1534           "for a system GC")                                                \
1535                                                                             \
1536   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1537           "The mean used by the parallel compact dead wood "                \
1538           "limiter (a number between 0-100)")                               \
1539           range(0, 100)                                                     \
1540                                                                             \
1541   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1542           "The standard deviation used by the parallel compact dead wood "  \
1543           "limiter (a number between 0-100)")                               \
1544           range(0, 100)                                                     \
1545                                                                             \
1546   product(uint, ParallelGCThreads, 0,                                       \
1547           "Number of parallel threads parallel gc will use")                \
1548           constraint(ParallelGCThreadsConstraintFunc,AfterErgo)             \
1549                                                                             \
1550   diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true,              \
1551             "Use semaphore synchronization for the GC Threads, "            \
1552             "instead of synchronization based on mutexes")                  \
1553                                                                             \
1554   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1555           "Dynamically choose the number of parallel threads "              \
1556           "parallel gc will use")                                           \
1557                                                                             \
1558   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1559           "Force dynamic selection of the number of "                       \
1560           "parallel threads parallel gc will use to aid debugging")         \
1561                                                                             \
1562   product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M),              \
1563           "Size of heap (bytes) per GC thread used in calculating the "     \
1564           "number of GC threads")                                           \
1565           range((size_t)os::vm_page_size(), (size_t)max_uintx)              \
1566                                                                             \
1567   product(uint, ConcGCThreads, 0,                                           \
1568           "Number of threads concurrent gc will use")                       \
1569           constraint(ConcGCThreadsConstraintFunc,AfterErgo)                 \
1570                                                                             \
1571   product(uintx, GCTaskTimeStampEntries, 200,                               \
1572           "Number of time stamp entries per gc worker thread")              \
1573           range(1, max_uintx)                                               \
1574                                                                             \
1575   product(bool, AlwaysTenure, false,                                        \
1576           "Always tenure objects in eden (ParallelGC only)")                \
1577                                                                             \
1578   product(bool, NeverTenure, false,                                         \
1579           "Never tenure objects in eden, may tenure on overflow "           \
1580           "(ParallelGC only)")                                              \
1581                                                                             \
1582   product(bool, ScavengeBeforeFullGC, true,                                 \
1583           "Scavenge youngest generation before each full GC.")              \
1584                                                                             \
1585   product(bool, UseConcMarkSweepGC, false,                                  \
1586           "Use Concurrent Mark-Sweep GC in the old generation")             \
1587                                                                             \
1588   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1589           "A System.gc() request invokes a concurrent collection; "         \
1590           "(effective only when using concurrent collectors)")              \
1591                                                                             \
1592   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1593           "A System.gc() request invokes a concurrent collection and "      \
1594           "also unloads classes during such a concurrent gc cycle "         \
1595           "(effective only when UseConcMarkSweepGC)")                       \
1596                                                                             \
1597   product(bool, GCLockerInvokesConcurrent, false,                           \
1598           "The exit of a JNI critical section necessitating a scavenge, "   \
1599           "also kicks off a background concurrent collection")              \
1600                                                                             \
1601   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1602           "How much the GC can expand the eden by while the GC locker "     \
1603           "is active (as a percentage)")                                    \
1604           range(0, 100)                                                     \
1605                                                                             \
1606   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1607           "Number of times to retry allocations when "                      \
1608           "blocked by the GC locker")                                       \
1609           range(0, max_uintx)                                               \
1610                                                                             \
1611   product(bool, UseCMSBestFit, true,                                        \
1612           "Use CMS best fit allocation strategy")                           \
1613                                                                             \
1614   product(bool, UseParNewGC, false,                                         \
1615           "Use parallel threads in the new generation")                     \
1616                                                                             \
1617   product(uintx, ParallelGCBufferWastePct, 10,                              \
1618           "Wasted fraction of parallel allocation buffer")                  \
1619           range(0, 100)                                                     \
1620                                                                             \
1621   product(uintx, TargetPLABWastePct, 10,                                    \
1622           "Target wasted space in last buffer as percent of overall "       \
1623           "allocation")                                                     \
1624           range(1, 100)                                                     \
1625                                                                             \
1626   product(uintx, PLABWeight, 75,                                            \
1627           "Percentage (0-100) used to weight the current sample when "      \
1628           "computing exponentially decaying average for ResizePLAB")        \
1629           range(0, 100)                                                     \
1630                                                                             \
1631   product(bool, ResizePLAB, true,                                           \
1632           "Dynamically resize (survivor space) promotion LAB's")            \
1633                                                                             \
1634   product(intx, ParGCArrayScanChunk, 50,                                    \
1635           "Scan a subset of object array and push remainder, if array is "  \
1636           "bigger than this")                                               \
1637           range(1, max_intx)                                                \
1638                                                                             \
1639   product(bool, ParGCUseLocalOverflow, false,                               \
1640           "Instead of a global overflow list, use local overflow stacks")   \
1641                                                                             \
1642   product(bool, ParGCTrimOverflow, true,                                    \
1643           "Eagerly trim the local overflow lists "                          \
1644           "(when ParGCUseLocalOverflow)")                                   \
1645                                                                             \
1646   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1647           "Simulate work queue overflow in ParNew")                         \
1648                                                                             \
1649   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1650           "An `interval' counter that determines how frequently "           \
1651           "we simulate overflow; a smaller number increases frequency")     \
1652                                                                             \
1653   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1654           "The desired number of objects to claim from the overflow list")  \
1655           range(0, max_uintx)                                               \
1656                                                                             \
1657   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1658           "The number of strides per worker thread that we divide up the "  \
1659           "card table scanning work into")                                  \
1660           range(1, max_uintx)                                               \
1661           constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo)         \
1662                                                                             \
1663   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1664           "The number of cards in each chunk of the parallel chunks used "  \
1665           "during card table scanning")                                     \
1666           range(1, max_intx)                                                \
1667                                                                             \
1668   product(uintx, OldPLABWeight, 50,                                         \
1669           "Percentage (0-100) used to weight the current sample when "      \
1670           "computing exponentially decaying average for resizing "          \
1671           "OldPLABSize")                                                    \
1672           range(0, 100)                                                     \
1673                                                                             \
1674   product(bool, ResizeOldPLAB, true,                                        \
1675           "Dynamically resize (old gen) promotion LAB's")                   \
1676                                                                             \
1677   product(size_t, CMSOldPLABMax, 1024,                                      \
1678           "Maximum size of CMS gen promotion LAB caches per worker "        \
1679           "per block size")                                                 \
1680           range(1, max_uintx)                                               \
1681           constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit)           \
1682                                                                             \
1683   product(size_t, CMSOldPLABMin, 16,                                        \
1684           "Minimum size of CMS gen promotion LAB caches per worker "        \
1685           "per block size")                                                 \
1686           range(1, max_uintx)                                               \
1687           constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit)           \
1688                                                                             \
1689   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1690           "Nominal number of refills of CMS gen promotion LAB cache "       \
1691           "per worker per block size")                                      \
1692           range(1, max_uintx)                                               \
1693                                                                             \
1694   product(bool, CMSOldPLABResizeQuicker, false,                             \
1695           "React on-the-fly during a scavenge to a sudden "                 \
1696           "change in block demand rate")                                    \
1697                                                                             \
1698   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1699           "The tolerance of the phase-change detector for on-the-fly "      \
1700           "PLAB resizing during a scavenge")                                \
1701           range(1, max_uintx)                                               \
1702                                                                             \
1703   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1704           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1705           "during a scavenge")                                              \
1706           range(1, max_uintx)                                               \
1707                                                                             \
1708   product(bool, AlwaysPreTouch, false,                                      \
1709           "Force all freshly committed pages to be pre-touched")            \
1710                                                                             \
1711   product_pd(size_t, CMSYoungGenPerWorker,                                  \
1712           "The maximum size of young gen chosen by default per GC worker "  \
1713           "thread available")                                               \
1714           range(1, max_uintx)                                               \
1715                                                                             \
1716   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1717           "Percentage (0-100) used to add conservatism when computing the " \
1718           "duty cycle")                                                     \
1719           range(0, 100)                                                     \
1720                                                                             \
1721   product(uintx, CMSExpAvgFactor, 50,                                       \
1722           "Percentage (0-100) used to weight the current sample when "      \
1723           "computing exponential averages for CMS statistics")              \
1724           range(0, 100)                                                     \
1725                                                                             \
1726   product(uintx, CMS_FLSWeight, 75,                                         \
1727           "Percentage (0-100) used to weight the current sample when "      \
1728           "computing exponentially decaying averages for CMS FLS "          \
1729           "statistics")                                                     \
1730           range(0, 100)                                                     \
1731                                                                             \
1732   product(uintx, CMS_FLSPadding, 1,                                         \
1733           "The multiple of deviation from mean to use for buffering "       \
1734           "against volatility in free list demand")                         \
1735           range(0, max_juint)                                               \
1736                                                                             \
1737   product(uintx, FLSCoalescePolicy, 2,                                      \
1738           "CMS: aggressiveness level for coalescing, increasing "           \
1739           "from 0 to 4")                                                    \
1740           range(0, 4)                                                       \
1741                                                                             \
1742   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1743           "CMS: larger free blocks are always available for coalescing")    \
1744                                                                             \
1745   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1746           "CMS: the smaller the percentage the greater the coalescing "     \
1747           "force")                                                          \
1748           range(0.0, 1.0)                                                   \
1749                                                                             \
1750   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1751           "CMS: the factor by which to inflate estimated demand of small "  \
1752           "block sizes to prevent coalescing with an adjoining block")      \
1753           range(0.0, DBL_MAX)                                               \
1754                                                                             \
1755   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1756           "CMS: the factor by which to inflate estimated demand of large "  \
1757           "block sizes to prevent coalescing with an adjoining block")      \
1758           range(0.0, DBL_MAX)                                               \
1759                                                                             \
1760   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1761           "CMS: the factor by which to inflate estimated demand of small "  \
1762           "block sizes to prevent splitting to supply demand for smaller "  \
1763           "blocks")                                                         \
1764           range(0.0, DBL_MAX)                                               \
1765                                                                             \
1766   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1767           "CMS: the factor by which to inflate estimated demand of large "  \
1768           "block sizes to prevent splitting to supply demand for smaller "  \
1769           "blocks")                                                         \
1770           range(0.0, DBL_MAX)                                               \
1771                                                                             \
1772   product(bool, CMSExtrapolateSweep, false,                                 \
1773           "CMS: cushion for block demand during sweep")                     \
1774                                                                             \
1775   product(uintx, CMS_SweepWeight, 75,                                       \
1776           "Percentage (0-100) used to weight the current sample when "      \
1777           "computing exponentially decaying average for inter-sweep "       \
1778           "duration")                                                       \
1779           range(0, 100)                                                     \
1780                                                                             \
1781   product(uintx, CMS_SweepPadding, 1,                                       \
1782           "The multiple of deviation from mean to use for buffering "       \
1783           "against volatility in inter-sweep duration")                     \
1784           range(0, max_juint)                                               \
1785                                                                             \
1786   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1787           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1788           "duration exceeds this threshold in milliseconds")                \
1789           range(0, max_uintx)                                               \
1790                                                                             \
1791   product(bool, CMSClassUnloadingEnabled, true,                             \
1792           "Whether class unloading enabled when using CMS GC")              \
1793                                                                             \
1794   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1795           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1796           "count for which classes may not be unloaded")                    \
1797           range(0, max_uintx)                                               \
1798                                                                             \
1799   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1800           "Replenish an indexed free list with this number of chunks")      \
1801           range(1, max_uintx)                                               \
1802                                                                             \
1803   product(bool, CMSReplenishIntermediate, true,                             \
1804           "Replenish all intermediate free-list caches")                    \
1805                                                                             \
1806   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1807           "When satisfying batched demand, split blocks from the "          \
1808           "IndexedFreeList whose size is a multiple of requested size")     \
1809                                                                             \
1810   product(bool, CMSLoopWarn, false,                                         \
1811           "Warn in case of excessive CMS looping")                          \
1812                                                                             \
1813   /* where does the range max value of (max_jint - 1) come from? */         \
1814   product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),         \
1815           "Maximum size of marking stack")                                  \
1816           range(1, (max_jint - 1))                                          \
1817                                                                             \
1818   product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),             \
1819           "Size of marking stack")                                          \
1820           constraint(MarkStackSizeConstraintFunc,AfterErgo)                 \
1821                                                                             \
1822   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1823           "Simulate frequent marking stack / work queue overflow")          \
1824                                                                             \
1825   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1826           "An \"interval\" counter that determines how frequently "         \
1827           "to simulate overflow; a smaller number increases frequency")     \
1828                                                                             \
1829   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1830           "Maximum number of abortable preclean iterations, if > 0")        \
1831           range(0, max_uintx)                                               \
1832                                                                             \
1833   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1834           "Maximum time in abortable preclean (in milliseconds)")           \
1835           range(0, max_intx)                                                \
1836                                                                             \
1837   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1838           "Nominal minimum work per abortable preclean iteration")          \
1839           range(0, max_uintx)                                               \
1840                                                                             \
1841   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1842           "Time that we sleep between iterations when not given "           \
1843           "enough work per iteration")                                      \
1844           range(0, max_intx)                                                \
1845                                                                             \
1846   product(size_t, CMSRescanMultiple, 32,                                    \
1847           "Size (in cards) of CMS parallel rescan task")                    \
1848           range(1, max_uintx)                                               \
1849                                                                             \
1850   product(size_t, CMSConcMarkMultiple, 32,                                  \
1851           "Size (in cards) of CMS concurrent MT marking task")              \
1852           range(1, max_uintx)                                               \
1853                                                                             \
1854   product(bool, CMSAbortSemantics, false,                                   \
1855           "Whether abort-on-overflow semantics is implemented")             \
1856                                                                             \
1857   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1858           "Use the parallel initial mark.")                                 \
1859                                                                             \
1860   product(bool, CMSParallelRemarkEnabled, true,                             \
1861           "Whether parallel remark enabled (only if ParNewGC)")             \
1862                                                                             \
1863   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1864           "Whether parallel remark of survivor space "                      \
1865           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1866                                                                             \
1867   product(bool, CMSPLABRecordAlways, true,                                  \
1868           "Always record survivor space PLAB boundaries (effective only "   \
1869           "if CMSParallelSurvivorRemarkEnabled)")                           \
1870                                                                             \
1871   product(bool, CMSEdenChunksRecordAlways, true,                            \
1872           "Always record eden chunks used for the parallel initial mark "   \
1873           "or remark of eden")                                              \
1874                                                                             \
1875   product(bool, CMSConcurrentMTEnabled, true,                               \
1876           "Whether multi-threaded concurrent work enabled "                 \
1877           "(effective only if ParNewGC)")                                   \
1878                                                                             \
1879   product(bool, CMSPrecleaningEnabled, true,                                \
1880           "Whether concurrent precleaning enabled")                         \
1881                                                                             \
1882   product(uintx, CMSPrecleanIter, 3,                                        \
1883           "Maximum number of precleaning iteration passes")                 \
1884           range(0, 9)                                                       \
1885                                                                             \
1886   product(uintx, CMSPrecleanDenominator, 3,                                 \
1887           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1888           "ratio")                                                          \
1889           range(1, max_uintx)                                               \
1890           constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo)        \
1891                                                                             \
1892   product(uintx, CMSPrecleanNumerator, 2,                                   \
1893           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1894           "ratio")                                                          \
1895           range(0, max_uintx-1)                                             \
1896           constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo)          \
1897                                                                             \
1898   product(bool, CMSPrecleanRefLists1, true,                                 \
1899           "Preclean ref lists during (initial) preclean phase")             \
1900                                                                             \
1901   product(bool, CMSPrecleanRefLists2, false,                                \
1902           "Preclean ref lists during abortable preclean phase")             \
1903                                                                             \
1904   product(bool, CMSPrecleanSurvivors1, false,                               \
1905           "Preclean survivors during (initial) preclean phase")             \
1906                                                                             \
1907   product(bool, CMSPrecleanSurvivors2, true,                                \
1908           "Preclean survivors during abortable preclean phase")             \
1909                                                                             \
1910   product(uintx, CMSPrecleanThreshold, 1000,                                \
1911           "Do not iterate again if number of dirty cards is less than this")\
1912           range(100, max_uintx)                                             \
1913                                                                             \
1914   product(bool, CMSCleanOnEnter, true,                                      \
1915           "Clean-on-enter optimization for reducing number of dirty cards") \
1916                                                                             \
1917   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1918           "Choose variant (1,2) of verification following remark")          \
1919           range(1, 2)                                                       \
1920                                                                             \
1921   product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M,                  \
1922           "If Eden size is below this, do not try to schedule remark")      \
1923           range(0, max_uintx)                                               \
1924                                                                             \
1925   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1926           "The Eden occupancy percentage (0-100) at which "                 \
1927           "to try and schedule remark pause")                               \
1928           range(0, 100)                                                     \
1929                                                                             \
1930   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1931           "Start sampling eden top at least before young gen "              \
1932           "occupancy reaches 1/<ratio> of the size at which "               \
1933           "we plan to schedule remark")                                     \
1934           range(1, max_uintx)                                               \
1935                                                                             \
1936   product(uintx, CMSSamplingGrain, 16*K,                                    \
1937           "The minimum distance between eden samples for CMS (see above)")  \
1938           range(1, max_uintx)                                               \
1939                                                                             \
1940   product(bool, CMSScavengeBeforeRemark, false,                             \
1941           "Attempt scavenge before the CMS remark step")                    \
1942                                                                             \
1943   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1944           "Don't drain below this size per parallel worker/thief")          \
1945           range(1, max_juint)                                               \
1946           constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo)    \
1947                                                                             \
1948   manageable(intx, CMSWaitDuration, 2000,                                   \
1949           "Time in milliseconds that CMS thread waits for young GC")        \
1950           range(min_jint, max_jint)                                         \
1951                                                                             \
1952   develop(uintx, CMSCheckInterval, 1000,                                    \
1953           "Interval in milliseconds that CMS thread checks if it "          \
1954           "should start a collection cycle")                                \
1955                                                                             \
1956   product(bool, CMSYield, true,                                             \
1957           "Yield between steps of CMS")                                     \
1958                                                                             \
1959   product(size_t, CMSBitMapYieldQuantum, 10*M,                              \
1960           "Bitmap operations should process at most this many bits "        \
1961           "between yields")                                                 \
1962           range(1, max_uintx)                                               \
1963                                                                             \
1964   product(bool, CMSPrintChunksInDump, false,                                \
1965           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1966           "trace level include more detailed information about the"         \
1967           "free chunks")                \
1968                                                                             \
1969   product(bool, CMSPrintObjectsInDump, false,                               \
1970           "If logging for the \"gc\" and \"promotion\" tags is enabled on"  \
1971           "trace level include more detailed information about the"         \
1972           "allocated objects")                                              \
1973                                                                             \
1974   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1975           "Verify that all references across the FLS boundary "             \
1976           "are to valid objects")                                           \
1977                                                                             \
1978   diagnostic(bool, FLSVerifyLists, false,                                   \
1979           "Do lots of (expensive) FreeListSpace verification")              \
1980                                                                             \
1981   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1982           "Do lots of (expensive) FLS index table verification")            \
1983                                                                             \
1984   develop(bool, FLSVerifyDictionary, false,                                 \
1985           "Do lots of (expensive) FLS dictionary verification")             \
1986                                                                             \
1987   develop(bool, VerifyBlockOffsetArray, false,                              \
1988           "Do (expensive) block offset array verification")                 \
1989                                                                             \
1990   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1991           "Maintain _unallocated_block in BlockOffsetArray "                \
1992           "(currently applicable only to CMS collector)")                   \
1993                                                                             \
1994   product(intx, RefDiscoveryPolicy, 0,                                      \
1995           "Select type of reference discovery policy: "                     \
1996           "reference-based(0) or referent-based(1)")                        \
1997           range(ReferenceProcessor::DiscoveryPolicyMin,                     \
1998                 ReferenceProcessor::DiscoveryPolicyMax)                     \
1999                                                                             \
2000   product(bool, ParallelRefProcEnabled, false,                              \
2001           "Enable parallel reference processing whenever possible")         \
2002                                                                             \
2003   product(bool, ParallelRefProcBalancingEnabled, true,                      \
2004           "Enable balancing of reference processing queues")                \
2005                                                                             \
2006   product(uintx, CMSTriggerRatio, 80,                                       \
2007           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
2008           "allocated before a CMS collection cycle commences")              \
2009           range(0, 100)                                                     \
2010                                                                             \
2011   product(uintx, CMSBootstrapOccupancy, 50,                                 \
2012           "Percentage CMS generation occupancy at which to "                \
2013           "initiate CMS collection for bootstrapping collection stats")     \
2014           range(0, 100)                                                     \
2015                                                                             \
2016   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
2017           "Percentage CMS generation occupancy to start a CMS collection "  \
2018           "cycle. A negative value means that CMSTriggerRatio is used")     \
2019           range(min_intx, 100)                                              \
2020                                                                             \
2021   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
2022           "Percentage of the (entire) heap occupancy to start a "           \
2023           "concurrent GC cycle. It is used by GCs that trigger a "          \
2024           "concurrent GC cycle based on the occupancy of the entire heap, " \
2025           "not just one of the generations (e.g., G1). A value of 0 "       \
2026           "denotes 'do constant GC cycles'.")                               \
2027           range(0, 100)                                                     \
2028                                                                             \
2029   manageable(intx, CMSTriggerInterval, -1,                                  \
2030           "Commence a CMS collection cycle (at least) every so many "       \
2031           "milliseconds (0 permanently, -1 disabled)")                      \
2032           range(-1, max_intx)                                               \
2033                                                                             \
2034   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
2035           "Only use occupancy as a criterion for starting a CMS collection")\
2036                                                                             \
2037   product(uintx, CMSIsTooFullPercentage, 98,                                \
2038           "An absolute ceiling above which CMS will always consider the "   \
2039           "unloading of classes when class unloading is enabled")           \
2040           range(0, 100)                                                     \
2041                                                                             \
2042   develop(bool, CMSTestInFreeList, false,                                   \
2043           "Check if the coalesced range is already in the "                 \
2044           "free lists as claimed")                                          \
2045                                                                             \
2046   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
2047           "Check that all the garbage collected was returned to the "       \
2048           "free lists")                                                     \
2049                                                                             \
2050   notproduct(bool, ScavengeALot, false,                                     \
2051           "Force scavenge at every Nth exit from the runtime system "       \
2052           "(N=ScavengeALotInterval)")                                       \
2053                                                                             \
2054   develop(bool, FullGCALot, false,                                          \
2055           "Force full gc at every Nth exit from the runtime system "        \
2056           "(N=FullGCALotInterval)")                                         \
2057                                                                             \
2058   notproduct(bool, GCALotAtAllSafepoints, false,                            \
2059           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
2060                                                                             \
2061   notproduct(bool, PromotionFailureALot, false,                             \
2062           "Use promotion failure handling on every youngest generation "    \
2063           "collection")                                                     \
2064                                                                             \
2065   develop(uintx, PromotionFailureALotCount, 1000,                           \
2066           "Number of promotion failures occurring at PLAB "                 \
2067           "refill attempts (ParNew) or promotion attempts "                 \
2068           "(other young collectors)")                                       \
2069                                                                             \
2070   develop(uintx, PromotionFailureALotInterval, 5,                           \
2071           "Total collections between promotion failures a lot")             \
2072                                                                             \
2073   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2074           "Sleep time when sleep is used for yields")                       \
2075                                                                             \
2076   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2077           "Number of yields before a sleep is done during work stealing")   \
2078                                                                             \
2079   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2080           "Number of iterations in a spin loop between checks on "          \
2081           "time out of hard spin")                                          \
2082                                                                             \
2083   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2084           "Ratio of hard spins to calls to yield")                          \
2085                                                                             \
2086   develop(uintx, ObjArrayMarkingStride, 512,                                \
2087           "Number of object array elements to push onto the marking stack " \
2088           "before pushing a continuation entry")                            \
2089                                                                             \
2090   develop(bool, MetadataAllocationFailALot, false,                          \
2091           "Fail metadata allocations at intervals controlled by "           \
2092           "MetadataAllocationFailALotInterval")                             \
2093                                                                             \
2094   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2095           "Metadata allocation failure a lot interval")                     \
2096                                                                             \
2097   develop(bool, TraceMetadataChunkAllocation, false,                        \
2098           "Trace chunk metadata allocations")                               \
2099                                                                             \
2100   notproduct(bool, ExecuteInternalVMTests, false,                           \
2101           "Enable execution of internal VM tests")                          \
2102                                                                             \
2103   notproduct(bool, VerboseInternalVMTests, false,                           \
2104           "Turn on logging for internal VM tests.")                         \
2105                                                                             \
2106   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2107                                                                             \
2108   product_pd(bool, ResizeTLAB,                                              \
2109           "Dynamically resize TLAB size for threads")                       \
2110                                                                             \
2111   product(bool, ZeroTLAB, false,                                            \
2112           "Zero out the newly created TLAB")                                \
2113                                                                             \
2114   product(bool, FastTLABRefill, true,                                       \
2115           "Use fast TLAB refill code")                                      \
2116                                                                             \
2117   product(bool, TLABStats, true,                                            \
2118           "Provide more detailed and expensive TLAB statistics.")           \
2119                                                                             \
2120   product_pd(bool, NeverActAsServerClassMachine,                            \
2121           "Never act like a server-class machine")                          \
2122                                                                             \
2123   product(bool, AlwaysActAsServerClassMachine, false,                       \
2124           "Always act like a server-class machine")                         \
2125                                                                             \
2126   product_pd(uint64_t, MaxRAM,                                              \
2127           "Real memory size (in bytes) used to set maximum heap size")      \
2128           range(0, 0XFFFFFFFFFFFFFFFF)                                      \
2129                                                                             \
2130   product(size_t, ErgoHeapSizeLimit, 0,                                     \
2131           "Maximum ergonomically set heap size (in bytes); zero means use " \
2132           "MaxRAM / MaxRAMFraction")                                        \
2133           range(0, max_uintx)                                               \
2134                                                                             \
2135   product(uintx, MaxRAMFraction, 4,                                         \
2136           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2137           "size")                                                           \
2138           range(1, max_uintx)                                               \
2139                                                                             \
2140   product(uintx, MinRAMFraction, 2,                                         \
2141           "Minimum fraction (1/n) of real memory used for maximum heap "    \
2142           "size on systems with small physical memory size")                \
2143           range(1, max_uintx)                                               \
2144                                                                             \
2145   product(uintx, InitialRAMFraction, 64,                                    \
2146           "Fraction (1/n) of real memory used for initial heap size")       \
2147           range(1, max_uintx)                                               \
2148                                                                             \
2149   develop(uintx, MaxVirtMemFraction, 2,                                     \
2150           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2151           "determining maximum heap size")                                  \
2152                                                                             \
2153   product(bool, UseAutoGCSelectPolicy, false,                               \
2154           "Use automatic collection selection policy")                      \
2155                                                                             \
2156   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2157           "Automatic GC selection pause threshold in milliseconds")         \
2158           range(0, max_uintx)                                               \
2159                                                                             \
2160   product(bool, UseAdaptiveSizePolicy, true,                                \
2161           "Use adaptive generation sizing policies")                        \
2162                                                                             \
2163   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2164           "Use adaptive survivor sizing policies")                          \
2165                                                                             \
2166   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2167           "Use adaptive young-old sizing policies at minor collections")    \
2168                                                                             \
2169   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2170           "Use adaptive young-old sizing policies at major collections")    \
2171                                                                             \
2172   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2173           "Include statistics from System.gc() for adaptive size policy")   \
2174                                                                             \
2175   product(bool, UseAdaptiveGCBoundary, false,                               \
2176           "Allow young-old boundary to move")                               \
2177                                                                             \
2178   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2179           "Resize the virtual spaces of the young or old generations")      \
2180           range(-1, 1)                                                      \
2181                                                                             \
2182   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2183           "Policy for changing generation size for throughput goals")       \
2184           range(0, 1)                                                       \
2185                                                                             \
2186   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2187           "Number of steps where heuristics is used before data is used")   \
2188           range(0, max_uintx)                                               \
2189                                                                             \
2190   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2191           "Number of collections before the adaptive sizing is started")    \
2192                                                                             \
2193   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2194           "Collection interval for printing information; zero means never") \
2195           range(0, max_uintx)                                               \
2196                                                                             \
2197   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2198           "Use adaptive minimum footprint as a goal")                       \
2199                                                                             \
2200   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2201           "Weight given to exponential resizing, between 0 and 100")        \
2202           range(0, 100)                                                     \
2203                                                                             \
2204   product(uintx, AdaptiveTimeWeight,       25,                              \
2205           "Weight given to time in adaptive policy, between 0 and 100")     \
2206           range(0, 100)                                                     \
2207                                                                             \
2208   product(uintx, PausePadding, 1,                                           \
2209           "How much buffer to keep for pause time")                         \
2210           range(0, max_juint)                                               \
2211                                                                             \
2212   product(uintx, PromotedPadding, 3,                                        \
2213           "How much buffer to keep for promotion failure")                  \
2214           range(0, max_juint)                                               \
2215                                                                             \
2216   product(uintx, SurvivorPadding, 3,                                        \
2217           "How much buffer to keep for survivor overflow")                  \
2218           range(0, max_juint)                                               \
2219                                                                             \
2220   product(uintx, ThresholdTolerance, 10,                                    \
2221           "Allowed collection cost difference between generations")         \
2222           range(0, 100)                                                     \
2223                                                                             \
2224   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2225           "If collection costs are within margin, reduce both by full "     \
2226           "delta")                                                          \
2227           range(0, 100)                                                     \
2228                                                                             \
2229   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2230           "Adaptive size percentage change in young generation")            \
2231           range(0, 100)                                                     \
2232                                                                             \
2233   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2234           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2235           range(0, 100)                                                     \
2236                                                                             \
2237   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2238           "Decay factor to YoungedGenerationSizeSupplement")                \
2239           range(1, max_uintx)                                               \
2240                                                                             \
2241   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2242           "Adaptive size percentage change in tenured generation")          \
2243           range(0, 100)                                                     \
2244                                                                             \
2245   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2246           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2247           range(0, 100)                                                     \
2248                                                                             \
2249   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2250           "Decay factor to TenuredGenerationSizeIncrement")                 \
2251           range(1, max_uintx)                                               \
2252                                                                             \
2253   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2254           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2255           "or (G1 Only) the maximum GC time per MMU time slice")            \
2256           range(1, max_uintx)                                               \
2257           constraint(MaxGCPauseMillisConstraintFunc,AfterMemoryInit)        \
2258                                                                             \
2259   product(uintx, GCPauseIntervalMillis, 0,                                  \
2260           "Time slice for MMU specification")                               \
2261           constraint(GCPauseIntervalMillisConstraintFunc,AfterMemoryInit)   \
2262                                                                             \
2263   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2264           "Adaptive size policy maximum GC minor pause time goal "          \
2265           "in millisecond")                                                 \
2266           range(0, max_uintx)                                               \
2267                                                                             \
2268   product(uintx, GCTimeRatio, 99,                                           \
2269           "Adaptive size policy application time to GC time ratio")         \
2270           range(0, max_juint)                                               \
2271                                                                             \
2272   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2273           "Adaptive size scale down factor for shrinking")                  \
2274           range(1, max_uintx)                                               \
2275                                                                             \
2276   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2277           "Adaptive size decays the major cost for long major intervals")   \
2278                                                                             \
2279   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2280           "Time scale over which major costs decay")                        \
2281           range(0, max_uintx)                                               \
2282                                                                             \
2283   product(uintx, MinSurvivorRatio, 3,                                       \
2284           "Minimum ratio of young generation/survivor space size")          \
2285           range(3, max_uintx)                                               \
2286                                                                             \
2287   product(uintx, InitialSurvivorRatio, 8,                                   \
2288           "Initial ratio of young generation/survivor space size")          \
2289           range(0, max_uintx)                                               \
2290                                                                             \
2291   product(size_t, BaseFootPrintEstimate, 256*M,                             \
2292           "Estimate of footprint other than Java Heap")                     \
2293           range(0, max_uintx)                                               \
2294                                                                             \
2295   product(bool, UseGCOverheadLimit, true,                                   \
2296           "Use policy to limit of proportion of time spent in GC "          \
2297           "before an OutOfMemory error is thrown")                          \
2298                                                                             \
2299   product(uintx, GCTimeLimit, 98,                                           \
2300           "Limit of the proportion of time spent in GC before "             \
2301           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2302           range(0, 100)                                                     \
2303                                                                             \
2304   product(uintx, GCHeapFreeLimit, 2,                                        \
2305           "Minimum percentage of free space after a full GC before an "     \
2306           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2307           range(0, 100)                                                     \
2308                                                                             \
2309   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2310           "Number of consecutive collections before gc time limit fires")   \
2311           range(1, max_uintx)                                               \
2312                                                                             \
2313   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2314           "How far ahead to prefetch destination area (<= 0 means off)")    \
2315           range(-1, max_jint)                                               \
2316                                                                             \
2317   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2318           "How far ahead to prefetch scan area (<= 0 means off)")           \
2319           range(-1, max_jint)                                               \
2320                                                                             \
2321   product(intx, PrefetchFieldsAhead, -1,                                    \
2322           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2323           range(-1, max_jint)                                               \
2324                                                                             \
2325   diagnostic(bool, VerifyDuringStartup, false,                              \
2326           "Verify memory system before executing any Java code "            \
2327           "during VM initialization")                                       \
2328                                                                             \
2329   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2330           "Verify system before exiting")                                   \
2331                                                                             \
2332   diagnostic(bool, VerifyBeforeGC, false,                                   \
2333           "Verify memory system before GC")                                 \
2334                                                                             \
2335   diagnostic(bool, VerifyAfterGC, false,                                    \
2336           "Verify memory system after GC")                                  \
2337                                                                             \
2338   diagnostic(bool, VerifyDuringGC, false,                                   \
2339           "Verify memory system during GC (between phases)")                \
2340                                                                             \
2341   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2342           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2343           "are enabled. One or more sub-systems can be specified "          \
2344           "in a comma separated string. Sub-systems are: "                  \
2345           "threads, heap, symbol_table, string_table, codecache, "          \
2346           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2347           "c-heap, codecache_oops")                                         \
2348                                                                             \
2349   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2350           "Enable parallel memory system verification")                     \
2351                                                                             \
2352   diagnostic(bool, DeferInitialCardMark, false,                             \
2353           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2354           "may arise from new_pre_store_barrier")                           \
2355                                                                             \
2356   product(bool, UseCondCardMark, false,                                     \
2357           "Check for already marked card before updating card table")       \
2358                                                                             \
2359   diagnostic(bool, VerifyRememberedSets, false,                             \
2360           "Verify GC remembered sets")                                      \
2361                                                                             \
2362   diagnostic(bool, VerifyObjectStartArray, true,                            \
2363           "Verify GC object start array if verify before/after")            \
2364                                                                             \
2365   product(bool, DisableExplicitGC, false,                                   \
2366           "Ignore calls to System.gc()")                                    \
2367                                                                             \
2368   notproduct(bool, CheckMemoryInitialization, false,                        \
2369           "Check memory initialization")                                    \
2370                                                                             \
2371   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2372           "Bind CMS Thread to CPU if possible")                             \
2373                                                                             \
2374   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2375           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2376           range(0, max_juint)                                               \
2377                                                                             \
2378   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2379           "Bind GCTaskThreads to CPUs if possible")                         \
2380                                                                             \
2381   product(bool, UseGCTaskAffinity, false,                                   \
2382           "Use worker affinity when asking for GCTasks")                    \
2383                                                                             \
2384   product(uintx, ProcessDistributionStride, 4,                              \
2385           "Stride through processors when distributing processes")          \
2386           range(0, max_juint)                                               \
2387                                                                             \
2388   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2389           "Number of times the coordinator GC thread will sleep while "     \
2390           "yielding before giving up and resuming GC")                      \
2391           range(0, max_juint)                                               \
2392                                                                             \
2393   product(uintx, CMSYieldSleepCount, 0,                                     \
2394           "Number of times a GC thread (minus the coordinator) "            \
2395           "will sleep while yielding before giving up and resuming GC")     \
2396           range(0, max_juint)                                               \
2397                                                                             \
2398   develop(intx, ConcGCYieldTimeout, 0,                                      \
2399           "If non-zero, assert that GC threads yield within this "          \
2400           "number of milliseconds")                                         \
2401           range(0, max_intx)                                                \
2402                                                                             \
2403   develop(bool, TraceFinalizerRegistration, false,                          \
2404           "Trace registration of final references")                         \
2405                                                                             \
2406   notproduct(bool, TraceScavenge, false,                                    \
2407           "Trace scavenge")                                                 \
2408                                                                             \
2409   product(bool, IgnoreEmptyClassPaths, false,                               \
2410           "Ignore empty path elements in -classpath")                       \
2411                                                                             \
2412   product(bool, TraceClassPaths, false,                                     \
2413           "Trace processing of class paths")                                \
2414                                                                             \
2415   product_rw(bool, TraceClassLoading, false,                                \
2416           "Trace all classes loaded")                                       \
2417                                                                             \
2418   product(bool, TraceClassLoadingPreorder, false,                           \
2419           "Trace all classes loaded in order referenced (not loaded)")      \
2420                                                                             \
2421   product_rw(bool, TraceClassUnloading, false,                              \
2422           "Trace unloading of classes")                                     \
2423                                                                             \
2424   product_rw(bool, TraceLoaderConstraints, false,                           \
2425           "Trace loader constraints")                                       \
2426                                                                             \
2427   develop(bool, TraceClassLoaderData, false,                                \
2428           "Trace class loader loader_data lifetime")                        \
2429                                                                             \
2430   product(size_t, InitialBootClassLoaderMetaspaceSize,                      \
2431           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2432           "Initial size of the boot class loader data metaspace")           \
2433           range(30*K, max_uintx/BytesPerWord)                               \
2434           constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\
2435                                                                             \
2436   product(bool, TraceYoungGenTime, false,                                   \
2437           "Trace accumulated time for young collection")                    \
2438                                                                             \
2439   product(bool, TraceOldGenTime, false,                                     \
2440           "Trace accumulated time for old collection")                      \
2441                                                                             \
2442   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2443           "Print heap layout in response to SIGBREAK")                      \
2444                                                                             \
2445   manageable(bool, PrintClassHistogram, false,                              \
2446           "Print a histogram of class instances")                           \
2447                                                                             \
2448   develop(bool, TraceWorkGang, false,                                       \
2449           "Trace activities of work gangs")                                 \
2450                                                                             \
2451   develop(bool, TraceGCTaskManager, false,                                  \
2452           "Trace actions of the GC task manager")                           \
2453                                                                             \
2454   develop(bool, TraceGCTaskQueue, false,                                    \
2455           "Trace actions of the GC task queues")                            \
2456                                                                             \
2457   diagnostic(bool, TraceGCTaskThread, false,                                \
2458           "Trace actions of the GC task threads")                           \
2459                                                                             \
2460   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2461           "Trace marking phase in ParallelOldGC")                           \
2462                                                                             \
2463   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2464           "Trace dense prefix computation for ParallelOldGC")               \
2465                                                                             \
2466   develop(bool, IgnoreLibthreadGPFault, false,                              \
2467           "Suppress workaround for libthread GP fault")                     \
2468                                                                             \
2469   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2470           "The percentage of the used heap that the instances of a class "  \
2471           "must occupy for the class to generate a trace event")            \
2472           range(0.0, 100.0)                                                 \
2473                                                                             \
2474   /* JVMTI heap profiling */                                                \
2475                                                                             \
2476   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2477           "Trace JVMTI object tagging calls")                               \
2478                                                                             \
2479   diagnostic(bool, VerifyBeforeIteration, false,                            \
2480           "Verify memory system before JVMTI iteration")                    \
2481                                                                             \
2482   /* compiler interface */                                                  \
2483                                                                             \
2484   develop(bool, CIPrintCompilerName, false,                                 \
2485           "when CIPrint is active, print the name of the active compiler")  \
2486                                                                             \
2487   diagnostic(bool, CIPrintCompileQueue, false,                              \
2488           "display the contents of the compile queue whenever a "           \
2489           "compilation is enqueued")                                        \
2490                                                                             \
2491   develop(bool, CIPrintRequests, false,                                     \
2492           "display every request for compilation")                          \
2493                                                                             \
2494   product(bool, CITime, false,                                              \
2495           "collect timing information for compilation")                     \
2496                                                                             \
2497   develop(bool, CITimeVerbose, false,                                       \
2498           "be more verbose in compilation timings")                         \
2499                                                                             \
2500   develop(bool, CITimeEach, false,                                          \
2501           "display timing information after each successful compilation")   \
2502                                                                             \
2503   develop(bool, CICountOSR, false,                                          \
2504           "use a separate counter when assigning ids to osr compilations")  \
2505                                                                             \
2506   develop(bool, CICompileNatives, true,                                     \
2507           "compile native methods if supported by the compiler")            \
2508                                                                             \
2509   develop_pd(bool, CICompileOSR,                                            \
2510           "compile on stack replacement methods if supported by the "       \
2511           "compiler")                                                       \
2512                                                                             \
2513   develop(bool, CIPrintMethodCodes, false,                                  \
2514           "print method bytecodes of the compiled code")                    \
2515                                                                             \
2516   develop(bool, CIPrintTypeFlow, false,                                     \
2517           "print the results of ciTypeFlow analysis")                       \
2518                                                                             \
2519   develop(bool, CITraceTypeFlow, false,                                     \
2520           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2521                                                                             \
2522   develop(intx, OSROnlyBCI, -1,                                             \
2523           "OSR only at this bci.  Negative values mean exclude that bci")   \
2524                                                                             \
2525   /* compiler */                                                            \
2526                                                                             \
2527   /* notice: the max range value here is max_jint, not max_intx  */         \
2528   /* because of overflow issue                                   */         \
2529   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2530           "Number of compiler threads to run")                              \
2531           range(0, max_jint)                                                \
2532           constraint(CICompilerCountConstraintFunc, AtParse)                \
2533                                                                             \
2534   product(intx, CompilationPolicyChoice, 0,                                 \
2535           "which compilation policy (0-3)")                                 \
2536           range(0, 3)                                                       \
2537                                                                             \
2538   develop(bool, UseStackBanging, true,                                      \
2539           "use stack banging for stack overflow checks (required for "      \
2540           "proper StackOverflow handling; disable only to measure cost "    \
2541           "of stackbanging)")                                               \
2542                                                                             \
2543   develop(bool, UseStrictFP, true,                                          \
2544           "use strict fp if modifier strictfp is set")                      \
2545                                                                             \
2546   develop(bool, GenerateSynchronizationCode, true,                          \
2547           "generate locking/unlocking code for synchronized methods and "   \
2548           "monitors")                                                       \
2549                                                                             \
2550   develop(bool, GenerateCompilerNullChecks, true,                           \
2551           "Generate explicit null checks for loads/stores/calls")           \
2552                                                                             \
2553   develop(bool, GenerateRangeChecks, true,                                  \
2554           "Generate range checks for array accesses")                       \
2555                                                                             \
2556   develop_pd(bool, ImplicitNullChecks,                                      \
2557           "Generate code for implicit null checks")                         \
2558                                                                             \
2559   product_pd(bool, TrapBasedNullChecks,                                     \
2560           "Generate code for null checks that uses a cmp and trap "         \
2561           "instruction raising SIGTRAP.  This is only used if an access to" \
2562           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2563           "ImplicitNullChecks don't work (PPC64).")                         \
2564                                                                             \
2565   product(bool, PrintSafepointStatistics, false,                            \
2566           "Print statistics about safepoint synchronization")               \
2567                                                                             \
2568   product(intx, PrintSafepointStatisticsCount, 300,                         \
2569           "Total number of safepoint statistics collected "                 \
2570           "before printing them out")                                       \
2571           range(1, max_intx)                                                \
2572                                                                             \
2573   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2574           "Print safepoint statistics only when safepoint takes "           \
2575           "more than PrintSafepointSatisticsTimeout in millis")             \
2576   LP64_ONLY(range(-1, max_intx/MICROUNITS))                                 \
2577   NOT_LP64(range(-1, max_intx))                                             \
2578                                                                             \
2579   product(bool, TraceSafepointCleanupTime, false,                           \
2580           "Print the break down of clean up tasks performed during "        \
2581           "safepoint")                                                      \
2582                                                                             \
2583   product(bool, Inline, true,                                               \
2584           "Enable inlining")                                                \
2585                                                                             \
2586   product(bool, ClipInlining, true,                                         \
2587           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2588                                                                             \
2589   develop(bool, UseCHA, true,                                               \
2590           "Enable CHA")                                                     \
2591                                                                             \
2592   product(bool, UseTypeProfile, true,                                       \
2593           "Check interpreter profile for historically monomorphic calls")   \
2594                                                                             \
2595   diagnostic(bool, PrintInlining, false,                                    \
2596           "Print inlining optimizations")                                   \
2597                                                                             \
2598   product(bool, UsePopCountInstruction, false,                              \
2599           "Use population count instruction")                               \
2600                                                                             \
2601   develop(bool, EagerInitialization, false,                                 \
2602           "Eagerly initialize classes if possible")                         \
2603                                                                             \
2604   diagnostic(bool, LogTouchedMethods, false,                                \
2605           "Log methods which have been ever touched in runtime")            \
2606                                                                             \
2607   diagnostic(bool, PrintTouchedMethodsAtExit, false,                        \
2608           "Print all methods that have been ever touched in runtime")       \
2609                                                                             \
2610   develop(bool, TraceMethodReplacement, false,                              \
2611           "Print when methods are replaced do to recompilation")            \
2612                                                                             \
2613   develop(bool, PrintMethodFlushing, false,                                 \
2614           "Print the nmethods being flushed")                               \
2615                                                                             \
2616   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2617           "print statistics about method flushing")                         \
2618                                                                             \
2619   diagnostic(intx, HotMethodDetectionLimit, 100000,                         \
2620           "Number of compiled code invocations after which "                \
2621           "the method is considered as hot by the flusher")                 \
2622           range(1, max_jint)                                                \
2623                                                                             \
2624   diagnostic(intx, MinPassesBeforeFlush, 10,                                \
2625           "Minimum number of sweeper passes before an nmethod "             \
2626           "can be flushed")                                                 \
2627           range(0, max_intx)                                                \
2628                                                                             \
2629   product(bool, UseCodeAging, true,                                         \
2630           "Insert counter to detect warm methods")                          \
2631                                                                             \
2632   diagnostic(bool, StressCodeAging, false,                                  \
2633           "Start with counters compiled in")                                \
2634                                                                             \
2635   develop(bool, UseRelocIndex, false,                                       \
2636           "Use an index to speed random access to relocations")             \
2637                                                                             \
2638   develop(bool, StressCodeBuffers, false,                                   \
2639           "Exercise code buffer expansion and other rare state changes")    \
2640                                                                             \
2641   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2642           "Generate extra debugging information for non-safepoints in "     \
2643           "nmethods")                                                       \
2644                                                                             \
2645   product(bool, PrintVMOptions, false,                                      \
2646           "Print flags that appeared on the command line")                  \
2647                                                                             \
2648   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2649           "Ignore unrecognized VM options")                                 \
2650                                                                             \
2651   product(bool, PrintCommandLineFlags, false,                               \
2652           "Print flags specified on command line or set by ergonomics")     \
2653                                                                             \
2654   product(bool, PrintFlagsInitial, false,                                   \
2655           "Print all VM flags before argument processing and exit VM")      \
2656                                                                             \
2657   product(bool, PrintFlagsFinal, false,                                     \
2658           "Print all VM flags after argument and ergonomic processing")     \
2659                                                                             \
2660   notproduct(bool, PrintFlagsWithComments, false,                           \
2661           "Print all VM flags with default values and descriptions and "    \
2662           "exit")                                                           \
2663                                                                             \
2664   product(bool, PrintFlagsRanges, false,                                    \
2665           "Print VM flags and their ranges and exit VM")                    \
2666                                                                             \
2667   diagnostic(bool, SerializeVMOutput, true,                                 \
2668           "Use a mutex to serialize output to tty and LogFile")             \
2669                                                                             \
2670   diagnostic(bool, DisplayVMOutput, true,                                   \
2671           "Display all VM output on the tty, independently of LogVMOutput") \
2672                                                                             \
2673   diagnostic(bool, LogVMOutput, false,                                      \
2674           "Save VM output to LogFile")                                      \
2675                                                                             \
2676   diagnostic(ccstr, LogFile, NULL,                                          \
2677           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2678           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2679                                                                             \
2680   product(ccstr, ErrorFile, NULL,                                           \
2681           "If an error occurs, save the error data to this file "           \
2682           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2683                                                                             \
2684   product(bool, DisplayVMOutputToStderr, false,                             \
2685           "If DisplayVMOutput is true, display all VM output to stderr")    \
2686                                                                             \
2687   product(bool, DisplayVMOutputToStdout, false,                             \
2688           "If DisplayVMOutput is true, display all VM output to stdout")    \
2689                                                                             \
2690   product(bool, UseHeavyMonitors, false,                                    \
2691           "use heavyweight instead of lightweight Java monitors")           \
2692                                                                             \
2693   product(bool, PrintStringTableStatistics, false,                          \
2694           "print statistics about the StringTable and SymbolTable")         \
2695                                                                             \
2696   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2697           "verify StringTable contents at exit")                            \
2698                                                                             \
2699   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2700           "print histogram of the symbol table")                            \
2701                                                                             \
2702   notproduct(bool, ExitVMOnVerifyError, false,                              \
2703           "standard exit from VM if bytecode verify error "                 \
2704           "(only in debug mode)")                                           \
2705                                                                             \
2706   diagnostic(ccstr, AbortVMOnException, NULL,                               \
2707           "Call fatal if this exception is thrown.  Example: "              \
2708           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2709                                                                             \
2710   diagnostic(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2711           "Call fatal if the exception pointed by AbortVMOnException "      \
2712           "has this message")                                               \
2713                                                                             \
2714   develop(bool, DebugVtables, false,                                        \
2715           "add debugging code to vtable dispatch")                          \
2716                                                                             \
2717   notproduct(bool, PrintVtableStats, false,                                 \
2718           "print vtables stats at end of run")                              \
2719                                                                             \
2720   develop(bool, TraceCreateZombies, false,                                  \
2721           "trace creation of zombie nmethods")                              \
2722                                                                             \
2723   notproduct(bool, IgnoreLockingAssertions, false,                          \
2724           "disable locking assertions (for speed)")                         \
2725                                                                             \
2726   product(bool, RangeCheckElimination, true,                                \
2727           "Eliminate range checks")                                         \
2728                                                                             \
2729   develop_pd(bool, UncommonNullCast,                                        \
2730           "track occurrences of null in casts; adjust compiler tactics")    \
2731                                                                             \
2732   develop(bool, TypeProfileCasts,  true,                                    \
2733           "treat casts like calls for purposes of type profiling")          \
2734                                                                             \
2735   develop(bool, DelayCompilationDuringStartup, true,                        \
2736           "Delay invoking the compiler until main application class is "    \
2737           "loaded")                                                         \
2738                                                                             \
2739   develop(bool, CompileTheWorld, false,                                     \
2740           "Compile all methods in all classes in bootstrap class path "     \
2741             "(stress test)")                                                \
2742                                                                             \
2743   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2744           "Preload all classes used by a class before start loading")       \
2745                                                                             \
2746   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2747           "Force a safepoint every n compiles so sweeper can keep up")      \
2748                                                                             \
2749   develop(bool, FillDelaySlots, true,                                       \
2750           "Fill delay slots (on SPARC only)")                               \
2751                                                                             \
2752   develop(bool, TimeLivenessAnalysis, false,                                \
2753           "Time computation of bytecode liveness analysis")                 \
2754                                                                             \
2755   develop(bool, TraceLivenessGen, false,                                    \
2756           "Trace the generation of liveness analysis information")          \
2757                                                                             \
2758   notproduct(bool, TraceLivenessQuery, false,                               \
2759           "Trace queries of liveness analysis information")                 \
2760                                                                             \
2761   notproduct(bool, CollectIndexSetStatistics, false,                        \
2762           "Collect information about IndexSets")                            \
2763                                                                             \
2764   develop(bool, UseLoopSafepoints, true,                                    \
2765           "Generate Safepoint nodes in every loop")                         \
2766                                                                             \
2767   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2768           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2769           "Inline allocations larger than this in doublewords must go slow")\
2770                                                                             \
2771   product(bool, AggressiveOpts, false,                                      \
2772           "Enable aggressive optimizations - see arguments.cpp")            \
2773                                                                             \
2774   product_pd(bool, CompactStrings,                                          \
2775           "Enable Strings to use single byte chars in backing store")       \
2776                                                                             \
2777   product_pd(uintx, TypeProfileLevel,                                       \
2778           "=XYZ, with Z: Type profiling of arguments at call; "             \
2779                      "Y: Type profiling of return value at call; "          \
2780                      "X: Type profiling of parameters to methods; "         \
2781           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2782           constraint(TypeProfileLevelConstraintFunc, AfterErgo)             \
2783                                                                             \
2784   product(intx, TypeProfileArgsLimit,     2,                                \
2785           "max number of call arguments to consider for type profiling")    \
2786           range(0, 16)                                                      \
2787                                                                             \
2788   product(intx, TypeProfileParmsLimit,    2,                                \
2789           "max number of incoming parameters to consider for type profiling"\
2790           ", -1 for all")                                                   \
2791           range(-1, 64)                                                     \
2792                                                                             \
2793   /* statistics */                                                          \
2794   develop(bool, CountCompiledCalls, false,                                  \
2795           "Count method invocations")                                       \
2796                                                                             \
2797   notproduct(bool, CountRuntimeCalls, false,                                \
2798           "Count VM runtime calls")                                         \
2799                                                                             \
2800   develop(bool, CountJNICalls, false,                                       \
2801           "Count jni method invocations")                                   \
2802                                                                             \
2803   notproduct(bool, CountJVMCalls, false,                                    \
2804           "Count jvm method invocations")                                   \
2805                                                                             \
2806   notproduct(bool, CountRemovableExceptions, false,                         \
2807           "Count exceptions that could be replaced by branches due to "     \
2808           "inlining")                                                       \
2809                                                                             \
2810   notproduct(bool, ICMissHistogram, false,                                  \
2811           "Produce histogram of IC misses")                                 \
2812                                                                             \
2813   /* interpreter */                                                         \
2814   develop(bool, ClearInterpreterLocals, false,                              \
2815           "Always clear local variables of interpreter activations upon "   \
2816           "entry")                                                          \
2817                                                                             \
2818   product_pd(bool, RewriteBytecodes,                                        \
2819           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2820                                                                             \
2821   product_pd(bool, RewriteFrequentPairs,                                    \
2822           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2823                                                                             \
2824   diagnostic(bool, PrintInterpreter, false,                                 \
2825           "Print the generated interpreter code")                           \
2826                                                                             \
2827   product(bool, UseInterpreter, true,                                       \
2828           "Use interpreter for non-compiled methods")                       \
2829                                                                             \
2830   develop(bool, UseFastSignatureHandlers, true,                             \
2831           "Use fast signature handlers for native calls")                   \
2832                                                                             \
2833   product(bool, UseLoopCounter, true,                                       \
2834           "Increment invocation counter on backward branch")                \
2835                                                                             \
2836   product_pd(bool, UseOnStackReplacement,                                   \
2837           "Use on stack replacement, calls runtime if invoc. counter "      \
2838           "overflows in loop")                                              \
2839                                                                             \
2840   notproduct(bool, TraceOnStackReplacement, false,                          \
2841           "Trace on stack replacement")                                     \
2842                                                                             \
2843   product_pd(bool, PreferInterpreterNativeStubs,                            \
2844           "Use always interpreter stubs for native methods invoked via "    \
2845           "interpreter")                                                    \
2846                                                                             \
2847   develop(bool, CountBytecodes, false,                                      \
2848           "Count number of bytecodes executed")                             \
2849                                                                             \
2850   develop(bool, PrintBytecodeHistogram, false,                              \
2851           "Print histogram of the executed bytecodes")                      \
2852                                                                             \
2853   develop(bool, PrintBytecodePairHistogram, false,                          \
2854           "Print histogram of the executed bytecode pairs")                 \
2855                                                                             \
2856   diagnostic(bool, PrintSignatureHandlers, false,                           \
2857           "Print code generated for native method signature handlers")      \
2858                                                                             \
2859   develop(bool, VerifyOops, false,                                          \
2860           "Do plausibility checks for oops")                                \
2861                                                                             \
2862   develop(bool, CheckUnhandledOops, false,                                  \
2863           "Check for unhandled oops in VM code")                            \
2864                                                                             \
2865   develop(bool, VerifyJNIFields, trueInDebug,                               \
2866           "Verify jfieldIDs for instance fields")                           \
2867                                                                             \
2868   notproduct(bool, VerifyJNIEnvThread, false,                               \
2869           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2870           "from JNI")                                                       \
2871                                                                             \
2872   develop(bool, VerifyFPU, false,                                           \
2873           "Verify FPU state (check for NaN's, etc.)")                       \
2874                                                                             \
2875   develop(bool, VerifyThread, false,                                        \
2876           "Watch the thread register for corruption (SPARC only)")          \
2877                                                                             \
2878   develop(bool, VerifyActivationFrameSize, false,                           \
2879           "Verify that activation frame didn't become smaller than its "    \
2880           "minimal size")                                                   \
2881                                                                             \
2882   develop(bool, TraceFrequencyInlining, false,                              \
2883           "Trace frequency based inlining")                                 \
2884                                                                             \
2885   develop_pd(bool, InlineIntrinsics,                                        \
2886           "Inline intrinsics that can be statically resolved")              \
2887                                                                             \
2888   product_pd(bool, ProfileInterpreter,                                      \
2889           "Profile at the bytecode level during interpretation")            \
2890                                                                             \
2891   develop(bool, TraceProfileInterpreter, false,                             \
2892           "Trace profiling at the bytecode level during interpretation. "   \
2893           "This outputs the profiling information collected to improve "    \
2894           "jit compilation.")                                               \
2895                                                                             \
2896   develop_pd(bool, ProfileTraps,                                            \
2897           "Profile deoptimization traps at the bytecode level")             \
2898                                                                             \
2899   product(intx, ProfileMaturityPercentage, 20,                              \
2900           "number of method invocations/branches (expressed as % of "       \
2901           "CompileThreshold) before using the method's profile")            \
2902           range(0, 100)                                                     \
2903                                                                             \
2904   diagnostic(bool, PrintMethodData, false,                                  \
2905           "Print the results of +ProfileInterpreter at end of run")         \
2906                                                                             \
2907   develop(bool, VerifyDataPointer, trueInDebug,                             \
2908           "Verify the method data pointer during interpreter profiling")    \
2909                                                                             \
2910   develop(bool, VerifyCompiledCode, false,                                  \
2911           "Include miscellaneous runtime verifications in nmethod code; "   \
2912           "default off because it disturbs nmethod size heuristics")        \
2913                                                                             \
2914   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2915           "Manually make GC thread crash then dump java stack trace;  "     \
2916           "Test only")                                                      \
2917                                                                             \
2918   /* compilation */                                                         \
2919   product(bool, UseCompiler, true,                                          \
2920           "Use Just-In-Time compilation")                                   \
2921                                                                             \
2922   develop(bool, TraceCompilationPolicy, false,                              \
2923           "Trace compilation policy")                                       \
2924                                                                             \
2925   develop(bool, TimeCompilationPolicy, false,                               \
2926           "Time the compilation policy")                                    \
2927                                                                             \
2928   product(bool, UseCounterDecay, true,                                      \
2929           "Adjust recompilation counters")                                  \
2930                                                                             \
2931   develop(intx, CounterHalfLifeTime,    30,                                 \
2932           "Half-life time of invocation counters (in seconds)")             \
2933                                                                             \
2934   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2935           "The minimum interval (in milliseconds) between invocation of "   \
2936           "CounterDecay")                                                   \
2937                                                                             \
2938   product(bool, AlwaysCompileLoopMethods, false,                            \
2939           "When using recompilation, never interpret methods "              \
2940           "containing loops")                                               \
2941                                                                             \
2942   product(bool, DontCompileHugeMethods, true,                               \
2943           "Do not compile methods > HugeMethodLimit")                       \
2944                                                                             \
2945   /* Bytecode escape analysis estimation. */                                \
2946   product(bool, EstimateArgEscape, true,                                    \
2947           "Analyze bytecodes to estimate escape state of arguments")        \
2948                                                                             \
2949   product(intx, BCEATraceLevel, 0,                                          \
2950           "How much tracing to do of bytecode escape analysis estimates "   \
2951           "(0-3)")                                                          \
2952           range(0, 3)                                                       \
2953                                                                             \
2954   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2955           "Maximum number of nested calls that are analyzed by BC EA")      \
2956           range(0, max_jint)                                                \
2957                                                                             \
2958   product(intx, MaxBCEAEstimateSize, 150,                                   \
2959           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2960           range(0, max_jint)                                                \
2961                                                                             \
2962   product(intx,  AllocatePrefetchStyle, 1,                                  \
2963           "0 = no prefetch, "                                               \
2964           "1 = prefetch instructions for each allocation, "                 \
2965           "2 = use TLAB watermark to gate allocation prefetch, "            \
2966           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2967           range(0, 3)                                                       \
2968                                                                             \
2969   product(intx,  AllocatePrefetchDistance, -1,                              \
2970           "Distance to prefetch ahead of allocation pointer. "              \
2971           "-1: use system-specific value (automatically determined")        \
2972           constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\
2973                                                                             \
2974   product(intx,  AllocatePrefetchLines, 3,                                  \
2975           "Number of lines to prefetch ahead of array allocation pointer")  \
2976           range(1, max_jint / 2)                                            \
2977                                                                             \
2978   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2979           "Number of lines to prefetch ahead of instance allocation "       \
2980           "pointer")                                                        \
2981           range(1, max_jint / 2)                                            \
2982                                                                             \
2983   product(intx,  AllocatePrefetchStepSize, 16,                              \
2984           "Step size in bytes of sequential prefetch instructions")         \
2985           range(1, max_jint)                                                \
2986           constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\
2987                                                                             \
2988   product(intx,  AllocatePrefetchInstr, 0,                                  \
2989           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2990           constraint(AllocatePrefetchInstrConstraintFunc, AfterErgo)        \
2991                                                                             \
2992   /* deoptimization */                                                      \
2993   develop(bool, TraceDeoptimization, false,                                 \
2994           "Trace deoptimization")                                           \
2995                                                                             \
2996   develop(bool, PrintDeoptimizationDetails, false,                          \
2997           "Print more information about deoptimization")                    \
2998                                                                             \
2999   develop(bool, DebugDeoptimization, false,                                 \
3000           "Tracing various information while debugging deoptimization")     \
3001                                                                             \
3002   product(intx, SelfDestructTimer, 0,                                       \
3003           "Will cause VM to terminate after a given time (in minutes) "     \
3004           "(0 means off)")                                                  \
3005           range(0, max_intx)                                                \
3006                                                                             \
3007   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3008           "The maximum number of lines in the stack trace for Java "        \
3009           "exceptions (0 means all)")                                       \
3010           range(0, max_jint/2)                                              \
3011                                                                             \
3012   develop(bool, TraceStackWalk, false,                                      \
3013           "Trace stack walking")                                            \
3014                                                                             \
3015   product(bool, MemberNameInStackFrame, true,                               \
3016           "Use MemberName in StackFrame")                                   \
3017                                                                             \
3018   /* notice: the max range value here is max_jint, not max_intx  */         \
3019   /* because of overflow issue                                   */         \
3020   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3021           "Guarantee a safepoint (at least) every so many milliseconds "    \
3022           "(0 means none)"))                                                \
3023   NOT_EMBEDDED(range(0, max_jint))                                          \
3024                                                                             \
3025   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3026           "Guarantee a safepoint (at least) every so many milliseconds "    \
3027           "(0 means none)"))                                                \
3028   EMBEDDED_ONLY(range(0, max_jint))                                         \
3029                                                                             \
3030   product(intx, SafepointTimeoutDelay, 10000,                               \
3031           "Delay in milliseconds for option SafepointTimeout")              \
3032   LP64_ONLY(range(0, max_intx/MICROUNITS))                                  \
3033   NOT_LP64(range(0, max_intx))                                              \
3034                                                                             \
3035   product(intx, NmethodSweepActivity, 10,                                   \
3036           "Removes cold nmethods from code cache if > 0. Higher values "    \
3037           "result in more aggressive sweeping")                             \
3038           range(0, 2000)                                                    \
3039                                                                             \
3040   notproduct(bool, LogSweeper, false,                                       \
3041           "Keep a ring buffer of sweeper activity")                         \
3042                                                                             \
3043   notproduct(intx, SweeperLogEntries, 1024,                                 \
3044           "Number of records in the ring buffer of sweeper activity")       \
3045                                                                             \
3046   notproduct(intx, MemProfilingInterval, 500,                               \
3047           "Time between each invocation of the MemProfiler")                \
3048                                                                             \
3049   develop(intx, MallocCatchPtr, -1,                                         \
3050           "Hit breakpoint when mallocing/freeing this pointer")             \
3051                                                                             \
3052   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3053           "List of assertions (file:line) to muzzle")                       \
3054                                                                             \
3055   notproduct(size_t, HandleAllocationLimit, 1024,                           \
3056           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3057           "is used")                                                        \
3058                                                                             \
3059   develop(size_t, TotalHandleAllocationLimit, 1024,                         \
3060           "Threshold for total handle allocation when "                     \
3061           "+TraceHandleAllocation is used")                                 \
3062                                                                             \
3063   develop(intx, StackPrintLimit, 100,                                       \
3064           "number of stack frames to print in VM-level stack dump")         \
3065                                                                             \
3066   notproduct(intx, MaxElementPrintSize, 256,                                \
3067           "maximum number of elements to print")                            \
3068                                                                             \
3069   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3070           "maximum number of subklasses to print when printing klass")      \
3071                                                                             \
3072   product(intx, MaxInlineLevel, 9,                                          \
3073           "maximum number of nested calls that are inlined")                \
3074           range(0, max_jint)                                                \
3075                                                                             \
3076   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3077           "maximum number of nested recursive calls that are inlined")      \
3078           range(0, max_jint)                                                \
3079                                                                             \
3080   develop(intx, MaxForceInlineLevel, 100,                                   \
3081           "maximum number of nested calls that are forced for inlining "    \
3082           "(using CompileCommand or marked w/ @ForceInline)")               \
3083           range(0, max_jint)                                                \
3084                                                                             \
3085   product_pd(intx, InlineSmallCode,                                         \
3086           "Only inline already compiled methods if their code size is "     \
3087           "less than this")                                                 \
3088           range(0, max_jint)                                                \
3089                                                                             \
3090   product(intx, MaxInlineSize, 35,                                          \
3091           "The maximum bytecode size of a method to be inlined")            \
3092           range(0, max_jint)                                                \
3093                                                                             \
3094   product_pd(intx, FreqInlineSize,                                          \
3095           "The maximum bytecode size of a frequent method to be inlined")   \
3096           range(0, max_jint)                                                \
3097                                                                             \
3098   product(intx, MaxTrivialSize, 6,                                          \
3099           "The maximum bytecode size of a trivial method to be inlined")    \
3100           range(0, max_jint)                                                \
3101                                                                             \
3102   product(intx, MinInliningThreshold, 250,                                  \
3103           "The minimum invocation count a method needs to have to be "      \
3104           "inlined")                                                        \
3105           range(0, max_jint)                                                \
3106                                                                             \
3107   develop(intx, MethodHistogramCutoff, 100,                                 \
3108           "The cutoff value for method invocation histogram (+CountCalls)") \
3109                                                                             \
3110   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3111           "Number of interpreted methods to show in profile")               \
3112                                                                             \
3113   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3114           "Number of compiled methods to show in profile")                  \
3115                                                                             \
3116   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3117           "Number of stub methods to show in profile")                      \
3118                                                                             \
3119   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3120           "Number of runtime stub nodes to show in profile")                \
3121                                                                             \
3122   product(intx, ProfileIntervalsTicks, 100,                                 \
3123           "Number of ticks between printing of interval profile "           \
3124           "(+ProfileIntervals)")                                            \
3125           range(0, max_intx)                                                \
3126                                                                             \
3127   notproduct(intx, ScavengeALotInterval,     1,                             \
3128           "Interval between which scavenge will occur with +ScavengeALot")  \
3129                                                                             \
3130   notproduct(intx, FullGCALotInterval,     1,                               \
3131           "Interval between which full gc will occur with +FullGCALot")     \
3132                                                                             \
3133   notproduct(intx, FullGCALotStart,     0,                                  \
3134           "For which invocation to start FullGCAlot")                       \
3135                                                                             \
3136   notproduct(intx, FullGCALotDummies,  32*K,                                \
3137           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3138           "to move")                                                        \
3139                                                                             \
3140   develop(intx, DontYieldALotInterval,    10,                               \
3141           "Interval between which yields will be dropped (milliseconds)")   \
3142                                                                             \
3143   develop(intx, MinSleepInterval,     1,                                    \
3144           "Minimum sleep() interval (milliseconds) when "                   \
3145           "ConvertSleepToYield is off (used for Solaris)")                  \
3146                                                                             \
3147   develop(intx, ProfilerPCTickThreshold,    15,                             \
3148           "Number of ticks in a PC buckets to be a hotspot")                \
3149                                                                             \
3150   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3151           "Number of exits until DeoptimizeALot kicks in")                  \
3152                                                                             \
3153   notproduct(intx, ZombieALotInterval,     5,                               \
3154           "Number of exits until ZombieALot kicks in")                      \
3155                                                                             \
3156   diagnostic(intx, MallocVerifyInterval,     0,                             \
3157           "If non-zero, verify C heap after every N calls to "              \
3158           "malloc/realloc/free")                                            \
3159           range(0, max_intx)                                                \
3160                                                                             \
3161   diagnostic(intx, MallocVerifyStart,     0,                                \
3162           "If non-zero, start verifying C heap after Nth call to "          \
3163           "malloc/realloc/free")                                            \
3164           range(0, max_intx)                                                \
3165                                                                             \
3166   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3167           "If non-zero, maximum number of words that malloc/realloc can "   \
3168           "allocate (for testing only)")                                    \
3169           range(0, max_uintx)                                               \
3170                                                                             \
3171   product(intx, TypeProfileWidth, 2,                                        \
3172           "Number of receiver types to record in call/cast profile")        \
3173           range(0, 8)                                                       \
3174                                                                             \
3175   experimental(intx, MethodProfileWidth, 0,                                 \
3176           "Number of methods to record in call profile")                    \
3177                                                                             \
3178   develop(intx, BciProfileWidth,      2,                                    \
3179           "Number of return bci's to record in ret profile")                \
3180                                                                             \
3181   product(intx, PerMethodRecompilationCutoff, 400,                          \
3182           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3183           range(-1, max_intx)                                               \
3184                                                                             \
3185   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3186           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3187           range(-1, max_intx)                                               \
3188                                                                             \
3189   product(intx, PerMethodTrapLimit,  100,                                   \
3190           "Limit on traps (of one kind) in a method (includes inlines)")    \
3191           range(0, max_jint)                                                \
3192                                                                             \
3193   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3194           "Limit on speculative traps (of one kind) in a method "           \
3195           "(includes inlines)")                                             \
3196           range(0, max_jint)                                                \
3197                                                                             \
3198   product(intx, PerBytecodeTrapLimit,  4,                                   \
3199           "Limit on traps (of one kind) at a particular BCI")               \
3200           range(0, max_jint)                                                \
3201                                                                             \
3202   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3203           "Extra method data trap entries for speculation")                 \
3204                                                                             \
3205   develop(intx, InlineFrequencyRatio,    20,                                \
3206           "Ratio of call site execution to caller method invocation")       \
3207           range(0, max_jint)                                                \
3208                                                                             \
3209   develop_pd(intx, InlineFrequencyCount,                                    \
3210           "Count of call site execution necessary to trigger frequent "     \
3211           "inlining")                                                       \
3212           range(0, max_jint)                                                \
3213                                                                             \
3214   develop(intx, InlineThrowCount,    50,                                    \
3215           "Force inlining of interpreted methods that throw this often")    \
3216           range(0, max_jint)                                                \
3217                                                                             \
3218   develop(intx, InlineThrowMaxSize,   200,                                  \
3219           "Force inlining of throwing methods smaller than this")           \
3220           range(0, max_jint)                                                \
3221                                                                             \
3222   develop(intx, ProfilerNodeSize,  1024,                                    \
3223           "Size in K to allocate for the Profile Nodes of each thread")     \
3224           range(0, 1024)                                                    \
3225                                                                             \
3226   /* gc parameters */                                                       \
3227   product(size_t, InitialHeapSize, 0,                                       \
3228           "Initial heap size (in bytes); zero means use ergonomics")        \
3229           constraint(InitialHeapSizeConstraintFunc,AfterErgo)               \
3230                                                                             \
3231   product(size_t, MaxHeapSize, ScaleForWordSize(96*M),                      \
3232           "Maximum heap size (in bytes)")                                   \
3233           constraint(MaxHeapSizeConstraintFunc,AfterErgo)                   \
3234                                                                             \
3235   product(size_t, OldSize, ScaleForWordSize(4*M),                           \
3236           "Initial tenured generation size (in bytes)")                     \
3237           range(0, max_uintx)                                               \
3238                                                                             \
3239   product(size_t, NewSize, ScaleForWordSize(1*M),                           \
3240           "Initial new generation size (in bytes)")                         \
3241           constraint(NewSizeConstraintFunc,AfterErgo)                       \
3242                                                                             \
3243   product(size_t, MaxNewSize, max_uintx,                                    \
3244           "Maximum new generation size (in bytes), max_uintx means set "    \
3245           "ergonomically")                                                  \
3246           range(0, max_uintx)                                               \
3247                                                                             \
3248   product_pd(size_t, HeapBaseMinAddress,                                    \
3249           "OS specific low limit for heap base address")                    \
3250           constraint(HeapBaseMinAddressConstraintFunc,AfterErgo)            \
3251                                                                             \
3252   product(size_t, PretenureSizeThreshold, 0,                                \
3253           "Maximum size in bytes of objects allocated in DefNew "           \
3254           "generation; zero means no maximum")                              \
3255           range(0, max_uintx)                                               \
3256                                                                             \
3257   product(size_t, MinTLABSize, 2*K,                                         \
3258           "Minimum allowed TLAB size (in bytes)")                           \
3259           range(1, max_uintx)                                               \
3260           constraint(MinTLABSizeConstraintFunc,AfterMemoryInit)             \
3261                                                                             \
3262   product(size_t, TLABSize, 0,                                              \
3263           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3264           constraint(TLABSizeConstraintFunc,AfterMemoryInit)                \
3265                                                                             \
3266   product(size_t, YoungPLABSize, 4096,                                      \
3267           "Size of young gen promotion LAB's (in HeapWords)")               \
3268           constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit)           \
3269                                                                             \
3270   product(size_t, OldPLABSize, 1024,                                        \
3271           "Size of old gen promotion LAB's (in HeapWords), or Number "      \
3272           "of blocks to attempt to claim when refilling CMS LAB's")         \
3273           constraint(OldPLABSizeConstraintFunc,AfterMemoryInit)             \
3274                                                                             \
3275   product(uintx, TLABAllocationWeight, 35,                                  \
3276           "Allocation averaging weight")                                    \
3277           range(0, 100)                                                     \
3278                                                                             \
3279   /* Limit the lower bound of this flag to 1 as it is used  */              \
3280   /* in a division expression.                              */              \
3281   product(uintx, TLABWasteTargetPercent, 1,                                 \
3282           "Percentage of Eden that can be wasted")                          \
3283           range(1, 100)                                                     \
3284                                                                             \
3285   product(uintx, TLABRefillWasteFraction,    64,                            \
3286           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3287           range(1, max_juint)                                               \
3288                                                                             \
3289   product(uintx, TLABWasteIncrement,    4,                                  \
3290           "Increment allowed waste at slow allocation")                     \
3291           range(0, max_jint)                                                \
3292           constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit)      \
3293                                                                             \
3294   product(uintx, SurvivorRatio, 8,                                          \
3295           "Ratio of eden/survivor space size")                              \
3296           range(1, max_uintx-2)                                             \
3297           constraint(SurvivorRatioConstraintFunc,AfterMemoryInit)           \
3298                                                                             \
3299   product(uintx, NewRatio, 2,                                               \
3300           "Ratio of old/new generation sizes")                              \
3301           range(0, max_uintx-1)                                             \
3302                                                                             \
3303   product_pd(size_t, NewSizeThreadIncrease,                                 \
3304           "Additional size added to desired new generation size per "       \
3305           "non-daemon thread (in bytes)")                                   \
3306           range(0, max_uintx)                                               \
3307                                                                             \
3308   product_pd(size_t, MetaspaceSize,                                         \
3309           "Initial size of Metaspaces (in bytes)")                          \
3310           constraint(MetaspaceSizeConstraintFunc,AfterErgo)                 \
3311                                                                             \
3312   product(size_t, MaxMetaspaceSize, max_uintx,                              \
3313           "Maximum size of Metaspaces (in bytes)")                          \
3314           constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo)              \
3315                                                                             \
3316   product(size_t, CompressedClassSpaceSize, 1*G,                            \
3317           "Maximum size of class area in Metaspace when compressed "        \
3318           "class pointers are used")                                        \
3319           range(1*M, 3*G)                                                   \
3320                                                                             \
3321   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3322           "The minimum percentage of heap free after GC to avoid expansion."\
3323           " For most GCs this applies to the old generation. In G1 and"     \
3324           " ParallelGC it applies to the whole heap.")                      \
3325           range(0, 100)                                                     \
3326           constraint(MinHeapFreeRatioConstraintFunc,AfterErgo)              \
3327                                                                             \
3328   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3329           "The maximum percentage of heap free after GC to avoid shrinking."\
3330           " For most GCs this applies to the old generation. In G1 and"     \
3331           " ParallelGC it applies to the whole heap.")                      \
3332           range(0, 100)                                                     \
3333           constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo)              \
3334                                                                             \
3335   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3336           "Number of milliseconds per MB of free space in the heap")        \
3337           range(0, max_intx)                                                \
3338           constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \
3339                                                                             \
3340   product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K),               \
3341           "The minimum change in heap space due to GC (in bytes)")          \
3342           range(0, max_uintx)                                               \
3343                                                                             \
3344   product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K),           \
3345           "The minimum expansion of Metaspace (in bytes)")                  \
3346           range(0, max_uintx)                                               \
3347                                                                             \
3348   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3349           "The maximum percentage of Metaspace free after GC to avoid "     \
3350           "shrinking")                                                      \
3351           range(0, 100)                                                     \
3352           constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3353                                                                             \
3354   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3355           "The minimum percentage of Metaspace free after GC to avoid "     \
3356           "expansion")                                                      \
3357           range(0, 99)                                                      \
3358           constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo)         \
3359                                                                             \
3360   product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M),             \
3361           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3362           range(0, max_uintx)                                               \
3363                                                                             \
3364   product(uintx, QueuedAllocationWarningCount, 0,                           \
3365           "Number of times an allocation that queues behind a GC "          \
3366           "will retry before printing a warning")                           \
3367           range(0, max_uintx)                                               \
3368                                                                             \
3369   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3370           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3371           range(0, max_uintx)                                               \
3372                                                                             \
3373   diagnostic(intx, VerifyGCLevel,     0,                                    \
3374           "Generation level at which to start +VerifyBefore/AfterGC")       \
3375           range(0, 1)                                                       \
3376                                                                             \
3377   product(uintx, MaxTenuringThreshold,    15,                               \
3378           "Maximum value for tenuring threshold")                           \
3379           range(0, markOopDesc::max_age + 1)                                \
3380           constraint(MaxTenuringThresholdConstraintFunc,AfterErgo)          \
3381                                                                             \
3382   product(uintx, InitialTenuringThreshold,    7,                            \
3383           "Initial value for tenuring threshold")                           \
3384           range(0, markOopDesc::max_age + 1)                                \
3385           constraint(InitialTenuringThresholdConstraintFunc,AfterErgo)      \
3386                                                                             \
3387   product(uintx, TargetSurvivorRatio,    50,                                \
3388           "Desired percentage of survivor space used after scavenge")       \
3389           range(0, 100)                                                     \
3390                                                                             \
3391   product(uintx, MarkSweepDeadRatio,     5,                                 \
3392           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3393           "Serial mark sweep treats this as both the minimum and maximum "  \
3394           "value. "                                                         \
3395           "CMS uses this value only if it falls back to mark sweep. "       \
3396           "Par compact uses a variable scale based on the density of the "  \
3397           "generation and treats this as the maximum value when the heap "  \
3398           "is either completely full or completely empty.  Par compact "    \
3399           "also has a smaller default value; see arguments.cpp.")           \
3400           range(0, 100)                                                     \
3401                                                                             \
3402   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3403           "How often should we fully compact the heap (ignoring the dead "  \
3404           "space parameters)")                                              \
3405           range(1, max_uintx)                                               \
3406                                                                             \
3407   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3408           "Delay between expansion and allocation (in milliseconds)")       \
3409                                                                             \
3410   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3411           "Delay in scheduling GC workers (in milliseconds)")               \
3412                                                                             \
3413   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3414           "(Unstable) Number of times to iterate in safepoint loop "        \
3415           "before blocking VM threads ")                                    \
3416           range(-1, max_jint-1)                                             \
3417                                                                             \
3418   product(intx, DeferPollingPageLoopCount,     -1,                          \
3419           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3420           "before changing safepoint polling page to RO ")                  \
3421           range(-1, max_jint-1)                                             \
3422                                                                             \
3423   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3424           range(0, max_intx)                                                \
3425                                                                             \
3426   product(bool, PSChunkLargeArrays, true,                                   \
3427           "Process large arrays in chunks")                                 \
3428                                                                             \
3429   product(uintx, GCDrainStackTargetSize, 64,                                \
3430           "Number of entries we will try to leave on the stack "            \
3431           "during parallel gc")                                             \
3432           range(0, max_juint)                                               \
3433                                                                             \
3434   /* stack parameters */                                                    \
3435   product_pd(intx, StackYellowPages,                                        \
3436           "Number of yellow zone (recoverable overflows) pages of size "    \
3437           "4KB. If pages are bigger yellow zone is aligned up.")            \
3438           range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5))     \
3439                                                                             \
3440   product_pd(intx, StackRedPages,                                           \
3441           "Number of red zone (unrecoverable overflows) pages of size "     \
3442           "4KB. If pages are bigger red zone is aligned up.")               \
3443           range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2))           \
3444                                                                             \
3445   product_pd(intx, StackReservedPages,                                      \
3446           "Number of reserved zone (reserved to annotated methods) pages"   \
3447           " of size 4KB. If pages are bigger reserved zone is aligned up.") \
3448           range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\
3449                                                                             \
3450   product(bool, RestrictReservedStack, true,                                \
3451           "Restrict @ReservedStackAccess to trusted classes")               \
3452                                                                             \
3453   /* greater stack shadow pages can't generate instruction to bang stack */ \
3454   product_pd(intx, StackShadowPages,                                        \
3455           "Number of shadow zone (for overflow checking) pages of size "    \
3456           "4KB. If pages are bigger shadow zone is aligned up. "            \
3457           "This should exceed the depth of the VM and native call stack.")  \
3458           range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30))    \
3459                                                                             \
3460   product_pd(intx, ThreadStackSize,                                         \
3461           "Thread Stack Size (in Kbytes)")                                  \
3462           range(0, (max_intx-os::vm_page_size())/(1 * K))                   \
3463                                                                             \
3464   product_pd(intx, VMThreadStackSize,                                       \
3465           "Non-Java Thread Stack Size (in Kbytes)")                         \
3466           range(0, max_intx/(1 * K))                                        \
3467                                                                             \
3468   product_pd(intx, CompilerThreadStackSize,                                 \
3469           "Compiler Thread Stack Size (in Kbytes)")                         \
3470           range(0, max_intx/(1 * K))                                        \
3471                                                                             \
3472   develop_pd(size_t, JVMInvokeMethodSlack,                                  \
3473           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3474                                                                             \
3475   /* code cache parameters                                    */            \
3476   /* ppc64/tiered compilation has large code-entry alignment. */            \
3477   develop(uintx, CodeCacheSegmentSize,                                      \
3478           64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),                   \
3479           "Code cache segment size (in bytes) - smallest unit of "          \
3480           "allocation")                                                     \
3481           range(1, 1024)                                                    \
3482           constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo)         \
3483                                                                             \
3484   develop_pd(intx, CodeEntryAlignment,                                      \
3485           "Code entry alignment for generated code (in bytes)")             \
3486           constraint(CodeEntryAlignmentConstraintFunc, AfterErgo)           \
3487                                                                             \
3488   product_pd(intx, OptoLoopAlignment,                                       \
3489           "Align inner loops to zero relative to this modulus")             \
3490           range(1, 16)                                                      \
3491           constraint(OptoLoopAlignmentConstraintFunc, AfterErgo)            \
3492                                                                             \
3493   product_pd(uintx, InitialCodeCacheSize,                                   \
3494           "Initial code cache size (in bytes)")                             \
3495           range(0, max_uintx)                                               \
3496                                                                             \
3497   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3498           "Minimum code cache size (in bytes) required to start VM.")       \
3499           range(0, max_uintx)                                               \
3500                                                                             \
3501   product(bool, SegmentedCodeCache, false,                                  \
3502           "Use a segmented code cache")                                     \
3503                                                                             \
3504   product_pd(uintx, ReservedCodeCacheSize,                                  \
3505           "Reserved code cache size (in bytes) - maximum code cache size")  \
3506           range(0, max_uintx)                                               \
3507                                                                             \
3508   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3509           "Size of code heap with non-profiled methods (in bytes)")         \
3510           range(0, max_uintx)                                               \
3511                                                                             \
3512   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3513           "Size of code heap with profiled methods (in bytes)")             \
3514           range(0, max_uintx)                                               \
3515                                                                             \
3516   product_pd(uintx, NonNMethodCodeHeapSize,                                 \
3517           "Size of code heap with non-nmethods (in bytes)")                 \
3518           range(0, max_uintx)                                               \
3519                                                                             \
3520   product_pd(uintx, CodeCacheExpansionSize,                                 \
3521           "Code cache expansion size (in bytes)")                           \
3522           range(0, max_uintx)                                               \
3523                                                                             \
3524   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3525           "Minimum number of segments in a code cache block")               \
3526           range(1, 100)                                                     \
3527                                                                             \
3528   notproduct(bool, ExitOnFullCodeCache, false,                              \
3529           "Exit the VM if we fill the code cache")                          \
3530                                                                             \
3531   product(bool, UseCodeCacheFlushing, true,                                 \
3532           "Remove cold/old nmethods from the code cache")                   \
3533                                                                             \
3534   product(uintx, StartAggressiveSweepingAt, 10,                             \
3535           "Start aggressive sweeping if X[%] of the code cache is free."    \
3536           "Segmented code cache: X[%] of the non-profiled heap."            \
3537           "Non-segmented code cache: X[%] of the total code cache")         \
3538           range(0, 100)                                                     \
3539                                                                             \
3540   /* interpreter debugging */                                               \
3541   develop(intx, BinarySwitchThreshold, 5,                                   \
3542           "Minimal number of lookupswitch entries for rewriting to binary " \
3543           "switch")                                                         \
3544                                                                             \
3545   develop(intx, StopInterpreterAt, 0,                                       \
3546           "Stop interpreter execution at specified bytecode number")        \
3547                                                                             \
3548   develop(intx, TraceBytecodesAt, 0,                                        \
3549           "Trace bytecodes starting with specified bytecode number")        \
3550                                                                             \
3551   /* compiler interface */                                                  \
3552   develop(intx, CIStart, 0,                                                 \
3553           "The id of the first compilation to permit")                      \
3554                                                                             \
3555   develop(intx, CIStop, max_jint,                                           \
3556           "The id of the last compilation to permit")                       \
3557                                                                             \
3558   develop(intx, CIStartOSR, 0,                                              \
3559           "The id of the first osr compilation to permit "                  \
3560           "(CICountOSR must be on)")                                        \
3561                                                                             \
3562   develop(intx, CIStopOSR, max_jint,                                        \
3563           "The id of the last osr compilation to permit "                   \
3564           "(CICountOSR must be on)")                                        \
3565                                                                             \
3566   develop(intx, CIBreakAtOSR, -1,                                           \
3567           "The id of osr compilation to break at")                          \
3568                                                                             \
3569   develop(intx, CIBreakAt, -1,                                              \
3570           "The id of compilation to break at")                              \
3571                                                                             \
3572   product(ccstrlist, CompileOnly, "",                                       \
3573           "List of methods (pkg/class.name) to restrict compilation to")    \
3574                                                                             \
3575   product(ccstr, CompileCommandFile, NULL,                                  \
3576           "Read compiler commands from this file [.hotspot_compiler]")      \
3577                                                                             \
3578   diagnostic(ccstr, CompilerDirectivesFile, NULL,                           \
3579           "Read compiler directives from this file")                        \
3580                                                                             \
3581   product(ccstrlist, CompileCommand, "",                                    \
3582           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3583                                                                             \
3584   develop(bool, ReplayCompiles, false,                                      \
3585           "Enable replay of compilations from ReplayDataFile")              \
3586                                                                             \
3587   product(ccstr, ReplayDataFile, NULL,                                      \
3588           "File containing compilation replay information"                  \
3589           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3590                                                                             \
3591    product(ccstr, InlineDataFile, NULL,                                     \
3592           "File containing inlining replay information"                     \
3593           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3594                                                                             \
3595   develop(intx, ReplaySuppressInitializers, 2,                              \
3596           "Control handling of class initialization during replay: "        \
3597           "0 - don't do anything special; "                                 \
3598           "1 - treat all class initializers as empty; "                     \
3599           "2 - treat class initializers for application classes as empty; " \
3600           "3 - allow all class initializers to run during bootstrap but "   \
3601           "    pretend they are empty after starting replay")               \
3602           range(0, 3)                                                       \
3603                                                                             \
3604   develop(bool, ReplayIgnoreInitErrors, false,                              \
3605           "Ignore exceptions thrown during initialization for replay")      \
3606                                                                             \
3607   product(bool, DumpReplayDataOnError, true,                                \
3608           "Record replay data for crashing compiler threads")               \
3609                                                                             \
3610   product(bool, CICompilerCountPerCPU, false,                               \
3611           "1 compiler thread for log(N CPUs)")                              \
3612                                                                             \
3613   develop(intx, CIFireOOMAt,    -1,                                         \
3614           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3615           "(non-negative value throws OOM after this many CI accesses "     \
3616           "in each compile)")                                               \
3617   notproduct(intx, CICrashAt, -1,                                           \
3618           "id of compilation to trigger assert in compiler thread for "     \
3619           "the purpose of testing, e.g. generation of replay data")         \
3620   notproduct(bool, CIObjectFactoryVerify, false,                            \
3621           "enable potentially expensive verification in ciObjectFactory")   \
3622                                                                             \
3623   /* Priorities */                                                          \
3624   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3625                                                                             \
3626   product(intx, ThreadPriorityPolicy, 0,                                    \
3627           "0 : Normal.                                                     "\
3628           "    VM chooses priorities that are appropriate for normal       "\
3629           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3630           "    to normal native priority. Java priorities below "           \
3631           "    NORM_PRIORITY map to lower native priority values. On       "\
3632           "    Windows applications are allowed to use higher native       "\
3633           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3634           "    not use the highest possible native priority,               "\
3635           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3636           "    system threads. On Linux thread priorities are ignored      "\
3637           "    because the OS does not support static priority in          "\
3638           "    SCHED_OTHER scheduling class which is the only choice for   "\
3639           "    non-root, non-realtime applications.                        "\
3640           "1 : Aggressive.                                                 "\
3641           "    Java thread priorities map over to the entire range of      "\
3642           "    native thread priorities. Higher Java thread priorities map "\
3643           "    to higher native thread priorities. This policy should be   "\
3644           "    used with care, as sometimes it can cause performance       "\
3645           "    degradation in the application and/or the entire system. On "\
3646           "    Linux this policy requires root privilege.")                 \
3647           range(0, 1)                                                       \
3648                                                                             \
3649   product(bool, ThreadPriorityVerbose, false,                               \
3650           "Print priority changes")                                         \
3651                                                                             \
3652   product(intx, CompilerThreadPriority, -1,                                 \
3653           "The native priority at which compiler threads should run "       \
3654           "(-1 means no change)")                                           \
3655           range(min_jint, max_jint)                                         \
3656           constraint(CompilerThreadPriorityConstraintFunc, AfterErgo)       \
3657                                                                             \
3658   product(intx, VMThreadPriority, -1,                                       \
3659           "The native priority at which the VM thread should run "          \
3660           "(-1 means no change)")                                           \
3661           range(-1, 127)                                                    \
3662                                                                             \
3663   product(bool, CompilerThreadHintNoPreempt, true,                          \
3664           "(Solaris only) Give compiler threads an extra quanta")           \
3665                                                                             \
3666   product(bool, VMThreadHintNoPreempt, false,                               \
3667           "(Solaris only) Give VM thread an extra quanta")                  \
3668                                                                             \
3669   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3670           "Map Java priorities to OS priorities")                           \
3671           range(-1, 127)                                                    \
3672                                                                             \
3673   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3674           "Map Java priorities to OS priorities")                           \
3675           range(-1, 127)                                                    \
3676                                                                             \
3677   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3678           "Map Java priorities to OS priorities")                           \
3679           range(-1, 127)                                                    \
3680                                                                             \
3681   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3682           "Map Java priorities to OS priorities")                           \
3683           range(-1, 127)                                                    \
3684                                                                             \
3685   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3686           "Map Java priorities to OS priorities")                           \
3687           range(-1, 127)                                                    \
3688                                                                             \
3689   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3690           "Map Java priorities to OS priorities")                           \
3691           range(-1, 127)                                                    \
3692                                                                             \
3693   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3694           "Map Java priorities to OS priorities")                           \
3695           range(-1, 127)                                                    \
3696                                                                             \
3697   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3698           "Map Java priorities to OS priorities")                           \
3699           range(-1, 127)                                                    \
3700                                                                             \
3701   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3702           "Map Java priorities to OS priorities")                           \
3703           range(-1, 127)                                                    \
3704                                                                             \
3705   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3706           "Map Java priorities to OS priorities")                           \
3707           range(-1, 127)                                                    \
3708                                                                             \
3709   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3710           "Java thread priority 10 maps to critical scheduling priority")   \
3711                                                                             \
3712   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3713           "Compiler thread(s) run at critical scheduling priority")         \
3714                                                                             \
3715   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3716           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3717                                                                             \
3718   /* compiler debugging */                                                  \
3719   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3720           "First class to consider when using +CompileTheWorld")            \
3721                                                                             \
3722   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3723           "Last class to consider when using +CompileTheWorld")             \
3724                                                                             \
3725   develop(intx, NewCodeParameter,      0,                                   \
3726           "Testing Only: Create a dedicated integer parameter before "      \
3727           "putback")                                                        \
3728                                                                             \
3729   /* new oopmap storage allocation */                                       \
3730   develop(intx, MinOopMapAllocation,     8,                                 \
3731           "Minimum number of OopMap entries in an OopMapSet")               \
3732                                                                             \
3733   /* Background Compilation */                                              \
3734   develop(intx, LongCompileThreshold,     50,                               \
3735           "Used with +TraceLongCompiles")                                   \
3736                                                                             \
3737   /* recompilation */                                                       \
3738   product_pd(intx, CompileThreshold,                                        \
3739           "number of interpreted method invocations before (re-)compiling") \
3740           constraint(CompileThresholdConstraintFunc, AfterErgo)             \
3741                                                                             \
3742   product(double, CompileThresholdScaling, 1.0,                             \
3743           "Factor to control when first compilation happens "               \
3744           "(both with and without tiered compilation): "                    \
3745           "values greater than 1.0 delay counter overflow, "                \
3746           "values between 0 and 1.0 rush counter overflow, "                \
3747           "value of 1.0 leaves compilation thresholds unchanged "           \
3748           "value of 0.0 is equivalent to -Xint. "                           \
3749           ""                                                                \
3750           "Flag can be set as per-method option. "                          \
3751           "If a value is specified for a method, compilation thresholds "   \
3752           "for that method are scaled by both the value of the global flag "\
3753           "and the value of the per-method flag.")                          \
3754           range(0.0, DBL_MAX)                                               \
3755                                                                             \
3756   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3757           "Interpreter (tier 0) invocation notification frequency")         \
3758           range(0, 30)                                                      \
3759                                                                             \
3760   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3761           "C1 without MDO (tier 2) invocation notification frequency")      \
3762           range(0, 30)                                                      \
3763                                                                             \
3764   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3765           "C1 with MDO profiling (tier 3) invocation notification "         \
3766           "frequency")                                                      \
3767           range(0, 30)                                                      \
3768                                                                             \
3769   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3770           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3771           range(0, 30)                                                      \
3772                                                                             \
3773   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3774           "Interpreter (tier 0) invocation notification frequency")         \
3775           range(0, 30)                                                      \
3776                                                                             \
3777   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3778           "C1 without MDO (tier 2) invocation notification frequency")      \
3779           range(0, 30)                                                      \
3780                                                                             \
3781   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3782           "C1 with MDO profiling (tier 3) invocation notification "         \
3783           "frequency")                                                      \
3784           range(0, 30)                                                      \
3785                                                                             \
3786   product(intx, Tier2CompileThreshold, 0,                                   \
3787           "threshold at which tier 2 compilation is invoked")               \
3788           range(0, max_jint)                                                \
3789                                                                             \
3790   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3791           "Back edge threshold at which tier 2 compilation is invoked")     \
3792           range(0, max_jint)                                                \
3793                                                                             \
3794   product(intx, Tier3InvocationThreshold, 200,                              \
3795           "Compile if number of method invocations crosses this "           \
3796           "threshold")                                                      \
3797           range(0, max_jint)                                                \
3798                                                                             \
3799   product(intx, Tier3MinInvocationThreshold, 100,                           \
3800           "Minimum invocation to compile at tier 3")                        \
3801           range(0, max_jint)                                                \
3802                                                                             \
3803   product(intx, Tier3CompileThreshold, 2000,                                \
3804           "Threshold at which tier 3 compilation is invoked (invocation "   \
3805           "minimum must be satisfied)")                                     \
3806           range(0, max_jint)                                                \
3807                                                                             \
3808   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3809           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3810           range(0, max_jint)                                                \
3811                                                                             \
3812   product(intx, Tier4InvocationThreshold, 5000,                             \
3813           "Compile if number of method invocations crosses this "           \
3814           "threshold")                                                      \
3815           range(0, max_jint)                                                \
3816                                                                             \
3817   product(intx, Tier4MinInvocationThreshold, 600,                           \
3818           "Minimum invocation to compile at tier 4")                        \
3819           range(0, max_jint)                                                \
3820                                                                             \
3821   product(intx, Tier4CompileThreshold, 15000,                               \
3822           "Threshold at which tier 4 compilation is invoked (invocation "   \
3823           "minimum must be satisfied")                                      \
3824           range(0, max_jint)                                                \
3825                                                                             \
3826   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3827           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3828           range(0, max_jint)                                                \
3829                                                                             \
3830   product(intx, Tier3DelayOn, 5,                                            \
3831           "If C2 queue size grows over this amount per compiler thread "    \
3832           "stop compiling at tier 3 and start compiling at tier 2")         \
3833           range(0, max_jint)                                                \
3834                                                                             \
3835   product(intx, Tier3DelayOff, 2,                                           \
3836           "If C2 queue size is less than this amount per compiler thread "  \
3837           "allow methods compiled at tier 2 transition to tier 3")          \
3838           range(0, max_jint)                                                \
3839                                                                             \
3840   product(intx, Tier3LoadFeedback, 5,                                       \
3841           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3842           "reaches this amount per compiler thread")                        \
3843           range(0, max_jint)                                                \
3844                                                                             \
3845   product(intx, Tier4LoadFeedback, 3,                                       \
3846           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3847           "reaches this amount per compiler thread")                        \
3848           range(0, max_jint)                                                \
3849                                                                             \
3850   product(intx, TieredCompileTaskTimeout, 50,                               \
3851           "Kill compile task if method was not used within "                \
3852           "given timeout in milliseconds")                                  \
3853           range(0, max_intx)                                                \
3854                                                                             \
3855   product(intx, TieredStopAtLevel, 4,                                       \
3856           "Stop at given compilation level")                                \
3857           range(0, 4)                                                       \
3858                                                                             \
3859   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3860           "Start profiling in interpreter if the counters exceed tier 3 "   \
3861           "thresholds by the specified percentage")                         \
3862           range(0, max_jint)                                                \
3863                                                                             \
3864   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3865           "Increase the compile threshold for C1 compilation if the code "  \
3866           "cache is filled by the specified percentage")                    \
3867           range(0, 99)                                                      \
3868                                                                             \
3869   product(intx, TieredRateUpdateMinTime, 1,                                 \
3870           "Minimum rate sampling interval (in milliseconds)")               \
3871           range(0, max_intx)                                                \
3872                                                                             \
3873   product(intx, TieredRateUpdateMaxTime, 25,                                \
3874           "Maximum rate sampling interval (in milliseconds)")               \
3875           range(0, max_intx)                                                \
3876                                                                             \
3877   product_pd(bool, TieredCompilation,                                       \
3878           "Enable tiered compilation")                                      \
3879                                                                             \
3880   product(bool, PrintTieredEvents, false,                                   \
3881           "Print tiered events notifications")                              \
3882                                                                             \
3883   product_pd(intx, OnStackReplacePercentage,                                \
3884           "NON_TIERED number of method invocations/branches (expressed as " \
3885           "% of CompileThreshold) before (re-)compiling OSR code")          \
3886           constraint(OnStackReplacePercentageConstraintFunc, AfterErgo)     \
3887                                                                             \
3888   product(intx, InterpreterProfilePercentage, 33,                           \
3889           "NON_TIERED number of method invocations/branches (expressed as " \
3890           "% of CompileThreshold) before profiling in the interpreter")     \
3891           range(0, 100)                                                     \
3892                                                                             \
3893   develop(intx, MaxRecompilationSearchLength,    10,                        \
3894           "The maximum number of frames to inspect when searching for "     \
3895           "recompilee")                                                     \
3896                                                                             \
3897   develop(intx, MaxInterpretedSearchLength,     3,                          \
3898           "The maximum number of interpreted frames to skip when searching "\
3899           "for recompilee")                                                 \
3900                                                                             \
3901   develop(intx, DesiredMethodLimit,  8000,                                  \
3902           "The desired maximum method size (in bytecodes) after inlining")  \
3903                                                                             \
3904   develop(intx, HugeMethodLimit,  8000,                                     \
3905           "Don't compile methods larger than this if "                      \
3906           "+DontCompileHugeMethods")                                        \
3907                                                                             \
3908   /* New JDK 1.4 reflection implementation */                               \
3909                                                                             \
3910   develop(intx, FastSuperclassLimit, 8,                                     \
3911           "Depth of hardwired instanceof accelerator array")                \
3912                                                                             \
3913   /* Properties for Java libraries  */                                      \
3914                                                                             \
3915   product(size_t, MaxDirectMemorySize, 0,                                   \
3916           "Maximum total size of NIO direct-buffer allocations")            \
3917           range(0, (size_t)SIZE_MAX)                                        \
3918                                                                             \
3919   /* Flags used for temporary code during development  */                   \
3920                                                                             \
3921   diagnostic(bool, UseNewCode, false,                                       \
3922           "Testing Only: Use the new version while testing")                \
3923                                                                             \
3924   diagnostic(bool, UseNewCode2, false,                                      \
3925           "Testing Only: Use the new version while testing")                \
3926                                                                             \
3927   diagnostic(bool, UseNewCode3, false,                                      \
3928           "Testing Only: Use the new version while testing")                \
3929                                                                             \
3930   /* flags for performance data collection */                               \
3931                                                                             \
3932   product(bool, UsePerfData, falseInEmbedded,                               \
3933           "Flag to disable jvmstat instrumentation for performance testing "\
3934           "and problem isolation purposes")                                 \
3935                                                                             \
3936   product(bool, PerfDataSaveToFile, false,                                  \
3937           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3938                                                                             \
3939   product(ccstr, PerfDataSaveFile, NULL,                                    \
3940           "Save PerfData memory to the specified absolute pathname. "       \
3941           "The string %p in the file name (if present) "                    \
3942           "will be replaced by pid")                                        \
3943                                                                             \
3944   product(intx, PerfDataSamplingInterval, 50,                               \
3945           "Data sampling interval (in milliseconds)")                       \
3946           range(PeriodicTask::min_interval, max_jint)                       \
3947           constraint(PerfDataSamplingIntervalFunc, AfterErgo)               \
3948                                                                             \
3949   develop(bool, PerfTraceDataCreation, false,                               \
3950           "Trace creation of Performance Data Entries")                     \
3951                                                                             \
3952   develop(bool, PerfTraceMemOps, false,                                     \
3953           "Trace PerfMemory create/attach/detach calls")                    \
3954                                                                             \
3955   product(bool, PerfDisableSharedMem, false,                                \
3956           "Store performance data in standard memory")                      \
3957                                                                             \
3958   product(intx, PerfDataMemorySize, 64*K,                                   \
3959           "Size of performance data memory region. Will be rounded "        \
3960           "up to a multiple of the native os page size.")                   \
3961           range(128, 32*64*K)                                               \
3962                                                                             \
3963   product(intx, PerfMaxStringConstLength, 1024,                             \
3964           "Maximum PerfStringConstant string length before truncation")     \
3965           range(32, 32*K)                                                   \
3966                                                                             \
3967   product(bool, PerfAllowAtExitRegistration, false,                         \
3968           "Allow registration of atexit() methods")                         \
3969                                                                             \
3970   product(bool, PerfBypassFileSystemCheck, false,                           \
3971           "Bypass Win32 file system criteria checks (Windows Only)")        \
3972                                                                             \
3973   product(intx, UnguardOnExecutionViolation, 0,                             \
3974           "Unguard page and retry on no-execute fault (Win32 only) "        \
3975           "0=off, 1=conservative, 2=aggressive")                            \
3976           range(0, 2)                                                       \
3977                                                                             \
3978   /* Serviceability Support */                                              \
3979                                                                             \
3980   product(bool, ManagementServer, false,                                    \
3981           "Create JMX Management Server")                                   \
3982                                                                             \
3983   product(bool, DisableAttachMechanism, false,                              \
3984           "Disable mechanism that allows tools to attach to this VM")       \
3985                                                                             \
3986   product(bool, StartAttachListener, false,                                 \
3987           "Always start Attach Listener at VM startup")                     \
3988                                                                             \
3989   manageable(bool, PrintConcurrentLocks, false,                             \
3990           "Print java.util.concurrent locks in thread dump")                \
3991                                                                             \
3992   product(bool, TransmitErrorReport, false,                                 \
3993           "Enable error report transmission on erroneous termination")      \
3994                                                                             \
3995   product(ccstr, ErrorReportServer, NULL,                                   \
3996           "Override built-in error report server address")                  \
3997                                                                             \
3998   /* Shared spaces */                                                       \
3999                                                                             \
4000   product(bool, UseSharedSpaces, true,                                      \
4001           "Use shared spaces for metadata")                                 \
4002                                                                             \
4003   product(bool, VerifySharedSpaces, false,                                  \
4004           "Verify shared spaces (false for default archive, true for "      \
4005           "archive specified by -XX:SharedArchiveFile)")                    \
4006                                                                             \
4007   product(bool, RequireSharedSpaces, false,                                 \
4008           "Require shared spaces for metadata")                             \
4009                                                                             \
4010   product(bool, DumpSharedSpaces, false,                                    \
4011           "Special mode: JVM reads a class list, loads classes, builds "    \
4012           "shared spaces, and dumps the shared spaces to a file to be "     \
4013           "used in future JVM runs")                                        \
4014                                                                             \
4015   product(bool, PrintSharedSpaces, false,                                   \
4016           "Print usage of shared spaces")                                   \
4017                                                                             \
4018   product(bool, PrintSharedArchiveAndExit, false,                           \
4019           "Print shared archive file contents")                             \
4020                                                                             \
4021   product(bool, PrintSharedDictionary, false,                               \
4022           "If PrintSharedArchiveAndExit is true, also print the shared "    \
4023           "dictionary")                                                     \
4024                                                                             \
4025   product(size_t, SharedReadWriteSize, DEFAULT_SHARED_READ_WRITE_SIZE,      \
4026           "Size of read-write space for metadata (in bytes)")               \
4027           range(MIN_SHARED_READ_WRITE_SIZE, MAX_SHARED_READ_WRITE_SIZE)     \
4028                                                                             \
4029   product(size_t, SharedReadOnlySize, DEFAULT_SHARED_READ_ONLY_SIZE,        \
4030           "Size of read-only space for metadata (in bytes)")                \
4031           range(MIN_SHARED_READ_ONLY_SIZE, MAX_SHARED_READ_ONLY_SIZE)       \
4032                                                                             \
4033   product(size_t, SharedMiscDataSize, DEFAULT_SHARED_MISC_DATA_SIZE,        \
4034           "Size of the shared miscellaneous data area (in bytes)")          \
4035           range(MIN_SHARED_MISC_DATA_SIZE, MAX_SHARED_MISC_DATA_SIZE)       \
4036                                                                             \
4037   product(size_t, SharedMiscCodeSize, DEFAULT_SHARED_MISC_CODE_SIZE,        \
4038           "Size of the shared miscellaneous code area (in bytes)")          \
4039           range(MIN_SHARED_MISC_CODE_SIZE, MAX_SHARED_MISC_CODE_SIZE)       \
4040                                                                             \
4041   product(size_t, SharedBaseAddress, LP64_ONLY(32*G)                        \
4042           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
4043           "Address to allocate shared memory region for class data")        \
4044           range(0, SIZE_MAX)                                                \
4045                                                                             \
4046   product(uintx, SharedSymbolTableBucketSize, 4,                            \
4047           "Average number of symbols per bucket in shared table")           \
4048           range(2, 246)                                                     \
4049                                                                             \
4050   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
4051           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
4052           "classes. Just exclude them from the shared dictionary.")         \
4053                                                                             \
4054   diagnostic(bool, PrintMethodHandleStubs, false,                           \
4055           "Print generated stub code for method handles")                   \
4056                                                                             \
4057   develop(bool, TraceMethodHandles, false,                                  \
4058           "trace internal method handle operations")                        \
4059                                                                             \
4060   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
4061           "perform extra checks when constructing method handles")          \
4062                                                                             \
4063   diagnostic(bool, ShowHiddenFrames, false,                                 \
4064           "show method handle implementation frames (usually hidden)")      \
4065                                                                             \
4066   experimental(bool, TrustFinalNonStaticFields, false,                      \
4067           "trust final non-static declarations for constant folding")       \
4068                                                                             \
4069   diagnostic(bool, FoldStableValues, true,                                  \
4070           "Optimize loads from stable fields (marked w/ @Stable)")          \
4071                                                                             \
4072   develop(bool, TraceInvokeDynamic, false,                                  \
4073           "trace internal invoke dynamic operations")                       \
4074                                                                             \
4075   diagnostic(bool, PauseAtStartup,      false,                              \
4076           "Causes the VM to pause at startup time and wait for the pause "  \
4077           "file to be removed (default: ./vm.paused.<pid>)")                \
4078                                                                             \
4079   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
4080           "The file to create and for whose removal to await when pausing " \
4081           "at startup. (default: ./vm.paused.<pid>)")                       \
4082                                                                             \
4083   diagnostic(bool, PauseAtExit, false,                                      \
4084           "Pause and wait for keypress on exit if a debugger is attached")  \
4085                                                                             \
4086   product(bool, ExtendedDTraceProbes,    false,                             \
4087           "Enable performance-impacting dtrace probes")                     \
4088                                                                             \
4089   product(bool, DTraceMethodProbes, false,                                  \
4090           "Enable dtrace probes for method-entry and method-exit")          \
4091                                                                             \
4092   product(bool, DTraceAllocProbes, false,                                   \
4093           "Enable dtrace probes for object allocation")                     \
4094                                                                             \
4095   product(bool, DTraceMonitorProbes, false,                                 \
4096           "Enable dtrace probes for monitor events")                        \
4097                                                                             \
4098   product(bool, RelaxAccessControlCheck, false,                             \
4099           "Relax the access control checks in the verifier")                \
4100                                                                             \
4101   product(uintx, StringTableSize, defaultStringTableSize,                   \
4102           "Number of buckets in the interned String table")                 \
4103           range(minimumStringTableSize, 111*defaultStringTableSize)         \
4104                                                                             \
4105   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
4106           "Number of buckets in the JVM internal Symbol table")             \
4107           range(minimumSymbolTableSize, 111*defaultSymbolTableSize)         \
4108                                                                             \
4109   product(bool, UseStringDeduplication, false,                              \
4110           "Use string deduplication")                                       \
4111                                                                             \
4112   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
4113           "A string must reach this age (or be promoted to an old region) " \
4114           "to be considered for deduplication")                             \
4115           range(1, markOopDesc::max_age)                                    \
4116                                                                             \
4117   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
4118           "Force table resize every time the table is scanned")             \
4119                                                                             \
4120   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
4121           "Force table rehash every time the table is scanned")             \
4122                                                                             \
4123   diagnostic(bool, WhiteBoxAPI, false,                                      \
4124           "Enable internal testing APIs")                                   \
4125                                                                             \
4126   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
4127            "Default survivor space alignment in bytes")                     \
4128            constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo)     \
4129                                                                             \
4130   product(bool , AllowNonVirtualCalls, false,                               \
4131           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
4132                                                                             \
4133   product(ccstr, DumpLoadedClassList, NULL,                                 \
4134           "Dump the names all loaded classes, that could be stored into "   \
4135           "the CDS archive, in the specified file")                         \
4136                                                                             \
4137   product(ccstr, SharedClassListFile, NULL,                                 \
4138           "Override the default CDS class list")                            \
4139                                                                             \
4140   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
4141           "Override the default location of the CDS archive file")          \
4142                                                                             \
4143   product(ccstr, ExtraSharedClassListFile, NULL,                            \
4144           "Extra classlist for building the CDS archive file")              \
4145                                                                             \
4146   experimental(size_t, ArrayAllocatorMallocLimit,                           \
4147           SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1),                       \
4148           "Allocation less than this value will be allocated "              \
4149           "using malloc. Larger allocations will use mmap.")                \
4150                                                                             \
4151   experimental(bool, AlwaysAtomicAccesses, false,                           \
4152           "Accesses to all variables should always be atomic")              \
4153                                                                             \
4154   product(bool, EnableTracing, false,                                       \
4155           "Enable event-based tracing")                                     \
4156                                                                             \
4157   product(bool, UseLockedTracing, false,                                    \
4158           "Use locked-tracing when doing event-based tracing")              \
4159                                                                             \
4160   diagnostic(bool, UseUnalignedAccesses, false,                             \
4161           "Use unaligned memory accesses in Unsafe")                        \
4162                                                                             \
4163   product_pd(bool, PreserveFramePointer,                                    \
4164              "Use the FP register for holding the frame pointer "           \
4165              "and not as a general purpose register.")                      \
4166                                                                             \
4167   diagnostic(bool, CheckIntrinsics, true,                                   \
4168              "When a class C is loaded, check that "                        \
4169              "(1) all intrinsics defined by the VM for class C are present "\
4170              "in the loaded class file and are marked with the "            \
4171              "@HotSpotIntrinsicCandidate annotation, that "                 \
4172              "(2) there is an intrinsic registered for all loaded methods " \
4173              "that are annotated with the @HotSpotIntrinsicCandidate "      \
4174              "annotation, and that "                                        \
4175              "(3) no orphan methods exist for class C (i.e., methods for "  \
4176              "which the VM declares an intrinsic but that are not declared "\
4177              "in the loaded class C. "                                      \
4178              "Check (3) is available only in debug builds.")                \
4179                                                                             \
4180   diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false,          \
4181              "Disable backwards compatibility for compile commands.")       \
4182                                                                             \
4183   diagnostic(bool, CompilerDirectivesPrint, false,                          \
4184              "Print compiler directives on installation.")                  \
4185   diagnostic(int,  CompilerDirectivesLimit, 50,                             \
4186              "Limit on number of compiler directives.")
4187 
4188 
4189 /*
4190  *  Macros for factoring of globals
4191  */
4192 
4193 // Interface macros
4194 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4195 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4196 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4197 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4198 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4199 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4200 #ifdef PRODUCT
4201 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    const type name = value;
4202 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        const type name = pd_##name;
4203 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   const type name = value;
4204 #else
4205 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4206 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4207 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4208 #endif // PRODUCT
4209 // Special LP64 flags, product only needed for now.
4210 #ifdef _LP64
4211 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4212 #else
4213 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4214 #endif // _LP64
4215 
4216 // Implementation macros
4217 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4218 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4219 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4220 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4221 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4222 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4223 #ifdef PRODUCT
4224 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)
4225 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)
4226 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
4227 #else
4228 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4229 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4230 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4231 #endif // PRODUCT
4232 #ifdef _LP64
4233 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4234 #else
4235 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4236 #endif // _LP64
4237 
4238 // Only materialize src code for range checking when required, ignore otherwise
4239 #define IGNORE_RANGE(a, b)
4240 // Only materialize src code for contraint checking when required, ignore otherwise
4241 #define IGNORE_CONSTRAINT(func,type)
4242 
4243 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \
4244               DECLARE_PD_DEVELOPER_FLAG, \
4245               DECLARE_PRODUCT_FLAG, \
4246               DECLARE_PD_PRODUCT_FLAG, \
4247               DECLARE_DIAGNOSTIC_FLAG, \
4248               DECLARE_EXPERIMENTAL_FLAG, \
4249               DECLARE_NOTPRODUCT_FLAG, \
4250               DECLARE_MANAGEABLE_FLAG, \
4251               DECLARE_PRODUCT_RW_FLAG, \
4252               DECLARE_LP64_PRODUCT_FLAG, \
4253               IGNORE_RANGE, \
4254               IGNORE_CONSTRAINT)
4255 
4256 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \
4257                  DECLARE_PD_DEVELOPER_FLAG, \
4258                  DECLARE_PRODUCT_FLAG, \
4259                  DECLARE_PD_PRODUCT_FLAG, \
4260                  DECLARE_DIAGNOSTIC_FLAG, \
4261                  DECLARE_NOTPRODUCT_FLAG, \
4262                  IGNORE_RANGE, \
4263                  IGNORE_CONSTRAINT)
4264 
4265 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \
4266            DECLARE_PRODUCT_FLAG, \
4267            DECLARE_DIAGNOSTIC_FLAG, \
4268            DECLARE_EXPERIMENTAL_FLAG, \
4269            DECLARE_NOTPRODUCT_FLAG, \
4270            IGNORE_RANGE, \
4271            IGNORE_CONSTRAINT)
4272 
4273 // Extensions
4274 
4275 #include "runtime/globals_ext.hpp"
4276 
4277 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---